JP2018058338A - Transmission belt and manufacturing method of transmission belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transmission belt which can receive higher tension for practical use, reduce variation in performance thereof, and shorten time required for manufacture, and a method for manufacturing the transmission belt.SOLUTION: The method for manufacturing a transmission belt 10 includes a formation step for core body in which a core body 13 is formed on an endless unvulcanized extending-side adhesive belt sleeve 102 by winding a sheet material 115 onto the extending-side adhesive belt sleeve 102. A width W115 of the sheet material 115 is set larger than a thickness T115 of the sheet material 115.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a transmission belt such as a wrapped V belt and a combined V belt, and a method for manufacturing the transmission belt.

  As transmission belts for transmitting power, synchronous transmission belts such as toothed belts, and friction transmission belts such as V-belts, V-ribbed belts, and flat belts are known (for example, see Patent Document 1). There are two types of V-belts: a low-edge type in which a rubber layer is exposed on the side surface for friction transmission, and a wrapped type in which the belt is covered with an outer cloth. These types are properly used as needed due to differences in required quality. Also, belts of various lengths (for example, belt lengths of 20 to 120 inches for the short type and 121 to 400 inches for the long length) are employed depending on the application.

  More specifically, toothed belts used in automobile applications, such as transmission drive of an overhead cam (OHC) shaft of an engine provided in an automobile, balancer drive, oil pump drive, opening / closing drive in a sliding door opening / closing mechanism, automobile Widely used in general industrial machinery such as V-ribbed belts, compressors, generators, pumps, and other agricultural machinery such as combine harvesters, rice planters, mowers, etc., which are widely used for power transmission in auxiliary machines such as air compressors and alternators V belts, rice grinders, and flat belts used for conveyance in grain dryers are known. In applications where multiple V belts are required, for example, a combined V belt in which a plurality of V belts are coupled in the belt width direction as disclosed in Patent Documents 2 to 4 is used.

  The above transmission belt has an endless belt body and a covering cloth. The belt main body has a configuration in which a core wire is embedded between an unvulcanized rubber layer on the inner peripheral side of the belt and an unvulcanized rubber layer on the outer peripheral side, and then these rubber layers are vulcanized. For example, a wrapped V belt has a configuration in which a core wire is embedded between a compressed rubber layer on the inner peripheral side of the belt and a stretched rubber layer on the outer peripheral side. The jacket cloth covers the periphery of the belt body over the entire length in the belt circumferential direction. The wrapped V-belt is characterized in that it does not place an unreasonable burden on the mechanism due to appropriate slipping of the belt during running of the belt. Further, the wrapped V belt has a small frictional sound due to the effect of the outer covering covering the belt main body.

International Publication No. WO2014 / 178161 JP-A-10-274290 JP 2001-241513 A JP-A-4-351350

   When the wrapped V-belt having the above-described configuration is manufactured, first, the raw rubber is subjected to a rolling process in order to form an unvulcanized rubber sheet that becomes a compressed rubber layer on the inner peripheral side. Next, the raw rubber formed into a strip shape by rolling is cut into predetermined lengths along the longitudinal direction of the strip. Next, the raw material rubber is formed as an unvulcanized rubber sheet by winding the cut raw rubber around the outer periphery of the molding mantle, and this unvulcanized rubber sheet is held in a circular shape by the molding mantle.

That is, an unvulcanized rubber sheet winding (setting) step is performed. The winding step is a molding for holding the unvulcanized rubber sheet in a circular shape by supporting the unvulcanized rubber sheet having flexibility as a processing target from the inner peripheral side of the unvulcanized rubber sheet. This is a step of winding an unvulcanized rubber sheet around the mantle.

   Next, a spinning process is performed in which a core wire, which is a rope-shaped member having a circular cross section, is wound around an unvulcanized rubber sheet wound around a molding mantle. In the spinning process, the core wire wound around the bobbin is fed out from the bobbin as the unvulcanized rubber sheet is rotated by the molding mantle. Then, the core wire fed out from the bobbin is spirally wound around the unvulcanized rubber sheet. Next, an upper sheet sticking process is performed. In the upper sheet attaching step, an unvulcanized rubber sheet that is formed in the same manner as the above-described unvulcanized rubber sheet and later becomes an extended rubber layer is wound around the outer periphery of the unvulcanized rubber sheet in a state where the core wire is wound. . As a result, an unvulcanized sleeve having a configuration in which the core wire is sandwiched between unvulcanized rubber sheets is completed.

  Then, the unvulcanized sleeve is cut for each predetermined width, and further cut (skived) into a V-shaped cross section, whereby the unvulcanized belt 200 shown in FIG. 36A is formed.

  In the spinning process described above, the thin core wire 201 is spirally wound around the unvulcanized rubber sheet 202 serving as a compression rubber layer in the unvulcanized belt 200. And it is desirable that the core wire 201 is accurately wound along the spiral line on the unvulcanized rubber sheet 202 of the unvulcanized belt 200. FIG. 36B is a development view schematically showing the unvulcanized rubber sheet 202 in a state where the core wire 201 is wound in the unvulcanized rubber sheet 202. 36 (A) and 36 (B), the position of one side surface 203 of unvulcanized rubber sheet 202 in unvulcanized belt 200 is, for example, unvulcanized rubber sheet 202 in FIG. 36 (B). It becomes the position of the straight line 204 near one end. Then, the core wire 201 on the unvulcanized rubber sheet 202 is cut along the straight line 204. As a result, on one side surface 203 of the unvulcanized belt 200, the core wire 201 appears with a sufficient length in the circumferential direction of the unvulcanized belt 200. Thereby, the core wire 201 can receive sufficient tension on the side surface 203 of the transmission belt.

  However, in the spinning process described above, since the thin core wire 201 is spirally wound around the unvulcanized rubber sheet 202, it is difficult to wind the core wire 201 along an accurate spiral line. Therefore, as shown in FIGS. 37A and 37B, the core wire 301 is wound so as to meander with respect to the spiral line on the unvulcanized rubber sheet 302 of the unvulcanized belt 300. Sometimes. FIG. 37B is a development view schematically showing the unvulcanized rubber sheet 302 in a state where the core wire 301 is wound in the unvulcanized rubber sheet 302. The position of one side surface 303 of the unvulcanized rubber sheet 302 in the unvulcanized belt 300 is, for example, the position of a straight line 304 near one end of the unvulcanized rubber sheet 302 in FIG. Thus, if the core wire 301 meanders, the core wire 301 on the unvulcanized rubber sheet 302 will be cut intermittently along the straight line 304. As a result, meandering core wire 301 appears intermittently in the circumferential direction of unvulcanized belt 300 on one side surface 303 of unvulcanized belt 300. That is, in one side surface 303 of the unvulcanized belt 300, regions where the core wire 301 exists and regions where the core wire 301 does not exist alternately exist. As described above, the core wire 301 existing in the small slice cannot function as a portion that receives the tension of the transmission belt, and as a result, the effective number of the core wires 301 (the core that can receive the tension of the transmission belt at a certain cut surface). The number of lines) is reduced. That is, the strength of the transmission belt is reduced.

  Further, since the core wire 301 is thread-like and thin, the number of windings of the core wire necessary for ensuring the strength of the transmission belt increases. For this reason, the time for winding the core wire 301 around the unvulcanized rubber sheet 302 becomes longer, and it takes time to manufacture the transmission belt.

  In Patent Document 1, no particular mention is made of such a variation in tension caused by the core wire.

  Moreover, when it is going to form the transmission belt which can endure a high load, it is possible to use a core wire with a thick wire diameter. However, in this case, since the transmission belt is used with high tension, a large deformation is likely to occur when the transmission belt falls into the groove of the pulley, and a large shear stress is generated inside the transmission belt. If it does so, peeling will arise easily in the interface between the contact bonding layer for adhering a core wire to a rubber layer, and a rubber layer especially.

  In view of the above-mentioned problems, the present invention can increase the tension that the transmission belt can practically receive, reduce variation in performance of the transmission belt, and reduce the time required for manufacturing, and An object of the present invention is to provide a method for manufacturing such a transmission belt.

  (1) In order to solve the above-described problem, a method for manufacturing a transmission belt according to an aspect of the present invention forms a core body on the belt sleeve by winding a sheet material around an endless unvulcanized belt sleeve. Including a core forming step, the width of the sheet material is set larger than the thickness of the sheet material.

  According to this configuration, the core body is formed by winding a wide flat sheet material around the belt sleeve in the core body forming step. For this reason, the area | region where the core body exists in the width direction of a belt sleeve can be made wider. For example, after an unvulcanized sleeve including an unvulcanized belt sleeve and a core body is formed, the unvulcanized sleeve is cut at a predetermined width, and the cut member has a V-shaped cross section. An unvulcanized belt is formed by performing a skive operation. As described above, since the region where the core body is present in the width direction of the belt sleeve is wide, the core body is located on both sides of the unvulcanized belt (surface facing the sheave surface of the pulley, etc.). It will appear continuously in the direction. Thereby, in one side of the unvulcanized belt, the core body appears in a sufficient length in the circumferential direction of the unvulcanized belt. As a result, the core body can receive sufficient tension on the side surface of the transmission belt that is completed by vulcanizing the unvulcanized belt. Thereby, the tension that the transmission belt can practically receive can be further increased. Furthermore, since the region where the core body exists in the width direction of the belt sleeve is wide, it is possible to more reliably prevent the core body from appearing intermittently in the circumferential direction of the belt sleeve on both side surfaces of the unvulcanized belt. Therefore, it is possible to suppress the occurrence of individual differences in the tension that the core body can receive on the side surface of the transmission belt. Thereby, the dispersion | variation in the performance of a transmission belt can be decreased more. Furthermore, since the sheet material has a wide shape, the number of times of winding around the belt sleeve can be reduced. Therefore, since the time required for forming the core can be reduced, the time required for manufacturing the transmission belt can be further reduced. Furthermore, when trying to form a transmission belt that can withstand high loads, it is not necessary to use a thick core wire as in the conventional case, and a relatively thin core is used, so the transmission belt is wrapped around a pulley. It is hard to be deformed greatly when it is, and the shear stress generated inside becomes relatively small. Therefore, peeling at the interface between the adhesive rubber layer and the rubber layer is less likely to occur.

  (2) Preferably, the sheet material is wound around the belt sleeve so that portions of the sheet material adjacent to each other in the width direction of the belt sleeve overlap each other in the radial direction of the belt sleeve.

  According to this configuration, the sheet materials adjacent to each other in the width direction of the belt sleeve can be arranged in a line along the width direction of the belt sleeve. Thereby, it can prevent that one of the said adjacent sheet | seat materials rides on the other. Thereby, a core can be arrange | positioned more uniformly along the width direction of a belt sleeve. Therefore, when tension is applied to the transmission belt, this tension can be received more evenly in the width direction of the belt sleeve by the core body. Thereby, the bias | bias of the tension | tensile_strength received within a transmission belt can be suppressed. As a result, when power is transmitted by wrapping multiple transmission belts around a pulley, etc. (during multi-running travel), it is possible to suppress differences in tension and elongation due to the tension between the multiple transmission belts. it can. Thereby, it can suppress that the transmission belt which reaches | attains a lifetime early because tension | tensile_strength acts excessively arises. Moreover, it is possible to suppress the occurrence of a transmission belt that reaches an early life due to wear due to slip as a result of a tension drop caused by a large elongation.

  For example, in a transmission belt having a conventional configuration, that is, a configuration in which a core wire is disposed between the compression rubber layer and the stretch rubber layer, when the thin core wire is wound around the belt sleeve serving as the compression rubber layer, The position is likely to deviate from the designed position. For this reason, the position of the core wire in the width direction of the belt sleeve is likely to shift. As a result, the position of the core wire is varied in one unvulcanized belt formed by cutting the belt sleeve every predetermined width. Further, the effective number of core wires (the number of core wires on the cut surface) varies among a plurality of unvulcanized belts. Causes of such variations include variations in pitch when winding the core wire, variations in core wire diameter, and meandering of the core wire with respect to the belt sleeve. If the effective number of the core wires is different among the plurality of transmission belts, the tensile elongation amount when tension is applied to these transmission belts is different. When a plurality of transmission belts with different elongation amounts are hung on a pulley or the like and run, sufficient power transmission cannot be performed due to a difference in tension between the multiple transmission belts. As a result, the over-tensioned belt reaches the end of its life early. In addition, a transmission belt having a large amount of elongation reduces the tension that can be transmitted at an early stage, and the service life is quickly reached from wear due to slip traveling. On the other hand, as described above, the sheet material is wound around the belt sleeve so that the portions adjacent to each other in the width direction of the core body overlap each other in the radial direction of the core body. It is possible to manufacture a transmission belt in which tension imbalance is suppressed.

  (3) Preferably, the core body is formed by spirally winding the sheet material, and a pitch at which the sheet material is wound around the belt sleeve is set to be equal to a width of the sheet material.

  According to this configuration, the sheet materials adjacent in the width direction of the belt sleeve are wound around the belt sleeve in a state where there is no gap in the width direction of the belt sleeve. Thereby, a core can be arrange | positioned over the whole region between the both sides | surfaces of a power transmission belt irrespective of the difference (thickness of a core, etc.) of the kind of power transmission belt. Thereby, the operation | work which changes the pitch which winds a core to a belt sleeve according to the kind of transmission belt becomes unnecessary. As a result, it is possible to prevent errors such as inappropriate setting of the pitch due to an operation error when changing the pitch of winding the core body around the belt sleeve according to the type of the transmission belt. As a result, it is possible to reduce labor during the production of the transmission belt and reduce the occurrence of defective products.

  For example, in a transmission belt having a conventional configuration, that is, a configuration in which a core wire is disposed between the compression rubber layer and the stretch rubber layer, the pitch when winding the core wire around the belt sleeve depends on the diameter of the core wire, etc. Need to be set. For this reason, it takes time and effort to set the pitch, and there is a possibility that an error in setting the pitch may occur. On the other hand, as described above, by making the width of the sheet material and the pitch at which the sheet material is wound the same, the width of the sheet material and the pitch at which the sheet material is wound are uniquely determined. For this reason, it is possible to reduce both the trouble of setting the pitch and the possibility of erroneous setting of the pitch.

  In addition, while forming the core body using a flat sheet material, and making the width of the sheet material and the pitch at which the sheet material is wound the same, one of the sheet materials adjacent in the width direction of the belt sleeve becomes the other. It is possible to more reliably suppress the ride. Accordingly, it is possible to suppress the occurrence of an operation of correcting the portion that has been ridden to a position where it is not ridden when the sheet material has been ridden. Thereby, the effort concerning manufacture of a transmission belt can be lessened.

  Further, for example, in a transmission belt having a conventional configuration, that is, a configuration in which a core wire is disposed between the compression rubber layer and the stretch rubber layer, the pitch when the core wire is wound around the belt sleeve is approximately equal to the diameter of the core wire. There is the same case. In this case, although the pitch is set slightly larger than the diameter of the core wire, a phenomenon in which one of the core wires adjacent in the width direction of the belt sleeve rides on the other tends to occur. Such a ride-up is caused by the fact that an error is likely to occur in the position at which the core wire is wound and the diameter of the core wire varies. Then, when the running of the core line occurs, it is necessary to correct the portion that has been ridden to a position where it is not ridden. On the other hand, as described above, by making the width of the sheet material and the pitch at which the sheet material is wound the same, it is possible to suppress such riding.

  (4) Preferably, the core is formed by laminating the sheet material in the radial direction of the belt sleeve.

  According to this structure, the core body of desired thickness can be easily formed by laminating | stacking a sheet | seat material. Thereby, it is not necessary to prepare in advance a plurality of types of sheet materials having different thicknesses according to the type of the transmission belt (difference in the size of the transmission belt, the tensile strength, etc.). As a result, preparation, labor and time for manufacturing the transmission belt can be reduced. Further, since it is not necessary to prepare a plurality of types of sheet materials, the space for the material storage in the transmission belt manufacturing factory can be used more widely. Further, since the work of replacing different types of sheet materials is not required, it is not necessary for the worker to frequently move a heavy bobbin around which the sheet materials are wound, and the heavy work can be reduced.

  (5) Preferably, end edges of portions adjacent to each other in the width direction of the belt sleeve of the sheet material are abutted at a predetermined abutting position, and between the sheet materials adjacent in the radial direction, The butting position is shifted in the width direction.

  According to this configuration, the sheet material is wound around the belt sleeve in a more stable posture. Thereby, at the time of use of a power transmission belt, each part of a core can receive tension more uniformly. Therefore, the dispersion | variation in the performance of a transmission belt can be suppressed more reliably.

  (6) Preferably, the apparatus further includes a belt sleeve forming step of forming the belt sleeve configured to contact the core body, wherein the belt sleeve forming step has a width shorter than the width of the belt sleeve. The belt sleeve is formed by winding a plurality of round-shaped rubber around the mantle, and the edges of the ribbon-shaped rubber adjacent to each other in the width direction of the belt sleeve are butted at a predetermined butting position, Edges of portions adjacent to each other in the width direction of the belt sleeve among the sheet material of the core body are abutted at a predetermined abutting position, the abutting position in the ribbon-shaped rubber, and the edge in the sheet material The butting position is shifted in the width direction.

  According to this configuration, the ribbon-like rubber is shorter than the width of the belt sleeve. For this reason, at least one of the thickness and the width of the belt sleeve can be adjusted by, for example, winding the ribbon rubber around the mantle. Thereby, for example, the compression rubber layer of arbitrary thickness is realizable by adjusting the mode which wraps ribbon-like rubber around a mantle according to the thickness of the belt sleeve used as the compression rubber layer of a transmission belt. This eliminates the need to prepare in advance a plurality of types of belt sleeves having different thicknesses according to the type of thickness such as a compressed rubber layer. As a result, preparation, labor and time for manufacturing the transmission belt can be reduced. In addition, since it is not necessary to prepare a plurality of types of belt sleeves, it is possible to use a wider space for the material storage in the transmission belt manufacturing plant. Moreover, if it is a ribbon-shaped rubber, the weight of the said ribbon-shaped rubber can be made light. For this reason, unlike the case where the belt sleeve is formed with a single rubber sheet, it is not necessary to move the heavy rubber sheet while dragging it, and the possibility of foreign matter entering the rubber can be reduced, and the heavy rubber sheet is moved. It can eliminate heavy labor. Furthermore, the butting position in the ribbon-shaped rubber and the butting position in the sheet material are shifted in the width direction. Thereby, the sheet material and the ribbon-like rubber are formed in an endless shape with a more stable posture. Thereby, at the time of use of a power transmission belt, each part of a core and a rubber layer can receive tension more uniformly. Therefore, the dispersion | variation in the performance of a transmission belt can be suppressed more reliably.

  (7) Preferably, the method further includes a belt sleeve forming step for forming the belt sleeve, wherein the belt sleeve is arranged to be an extension rubber layer of the transmission belt, and the transmission belt is compressed. A compression side belt sleeve arranged to be a rubber layer, and as the belt sleeve formation step, the extension side belt sleeve formation step is performed prior to the core body formation step to form the extension side belt sleeve. And a compression side belt sleeve forming step which is performed after the core forming step and forms the compression side belt sleeve.

  According to this configuration, since the compression side belt sleeve is formed after the core is formed, it is not necessary to make the shape of the compression side belt sleeve so as not to adversely affect the arrangement of the sheet material. For this reason, the freedom degree of the lamination | stacking method of a sheet material can be made higher.

  (8) Preferably, the method further includes a belt sleeve forming step for forming the belt sleeve, wherein the belt sleeve is provided with a compression side belt sleeve arranged to be a compression rubber layer of the transmission belt, and the belt sleeve As the forming step, there is provided a compression side belt sleeve forming step that is performed prior to the core body forming step to form the compression side belt sleeve, and the belt sleeve on which the core body is formed in the core body forming step is provided. An unvulcanized belt forming step for forming a plurality of unvulcanized belts by cutting along a circumferential direction of the belt sleeve, and an unvulcanized belt for coupling the plurality of unvulcanized belts to each other via a connecting portion A combining step.

  According to this configuration, in the so-called combined V-belt, the core body formed of the sheet material can be provided in the individual unvulcanized belts arranged in the width direction of the combined V-belt. Therefore, according to this configuration, it is possible to increase the tension that the combined V-belt can practically receive, to reduce the variation in the performance of the combined V-belt, and to reduce the manufacturing time. A manufacturing method can be provided.

  (9) Preferably, the method for manufacturing the transmission belt further includes a belt sleeve forming step for forming the belt sleeve, and the compression sleeve is disposed as the belt sleeve so as to be a compression rubber layer of the transmission belt. A compression belt belt forming step for forming the compression belt belt sleeve as the belt sleeve formation step; and the expansion as the belt sleeve formation step. An extension side belt sleeve forming step for forming a side belt sleeve, and the compression side belt sleeve, the extension side belt sleeve, and the belt sleeve on which the core body is formed along the circumferential direction of the belt sleeve. Unvulcanized belt that forms a plurality of unvulcanized belts by cutting And forming step further includes, unvulcanized belt coupling step of coupling together a plurality of the unvulcanized belt via a coupling portion coupled to the decompression side belt sleeve.

  According to this configuration, in the so-called combined V-belt, the core body formed of the sheet material can be provided in the individual unvulcanized belts arranged in the width direction of the combined V-belt. Therefore, according to this configuration, it is possible to increase the tension that the combined V-belt can practically receive, to reduce the variation in the performance of the combined V-belt, and to reduce the manufacturing time. A manufacturing method can be provided. Further, an extension side belt sleeve is provided between the core body and the connecting portion. Here, for example, a pair of coupled V-belts arranged so that the axial direction is directed in the vertical direction is used to sandwich a conveyed product such as a carrot leaf portion, and the conveyed product is rotated by driving the pair of coupled V-belts. A configuration for conveying in the belt circumferential direction is conceivable. In such a configuration, it is possible to impart sufficient strength to the combined V-belt that can more reliably suppress the slack (curvature due to sagging) of the combined V-belt.

  (10) In order to solve the above-described problem, a transmission belt according to an aspect of the present invention is an endless transmission belt provided with a compression rubber layer, and has a sheet material whose width is set larger than the thickness. The width direction of the sheet material provided on the outer peripheral surface side of the compressed rubber layer is along the width direction of the transmission belt, and the thickness direction of the sheet material is along the thickness direction of the transmission belt. A core body.

  According to this configuration, the core body as the reinforcing member can be extended over a wide range in the width direction of the transmission belt. In this way, the reinforcing member does not break in the width direction of the transmission belt as compared with the conventional case where the core wire is used as the reinforcing member of the transmission belt, so that the tension that the transmission belt can practically receive is reduced. Can be higher. Furthermore, since the area where the core body exists in the width direction of the transmission belt is wide, it is possible to more reliably prevent the core body from appearing intermittently in the circumferential direction of the transmission belt on both side surfaces of the transmission belt in the width direction. Therefore, it is possible to suppress the occurrence of individual differences in the tension that the core body can receive on the side surface of the transmission belt. Thereby, the dispersion | variation in the performance of a transmission belt can be decreased more. Furthermore, since the sheet material has a wide shape, the number of times of winding the belt sleeve when forming the transmission belt can be reduced as compared with the case of winding the core wire. Therefore, since the time required for forming the core can be reduced, the time required for manufacturing the transmission belt can be further reduced.

  (11) Preferably, in the core, portions of the sheet material adjacent to each other in the width direction of the transmission belt do not overlap in the thickness direction of the transmission belt.

  In this configuration, the sheet materials adjacent in the width direction of the transmission belt are arranged in a line along the width direction of the transmission belt. In other words, one of the adjacent sheet materials does not ride on the other. Thereby, a core is arrange | positioned more uniformly along the width direction of a power transmission belt. Therefore, when tension is applied to the transmission belt, this tension can be received more evenly in the width direction of the transmission belt by the core. Thereby, the bias | bias of the tension | tensile_strength received within a transmission belt can be suppressed. As a result, when power is transmitted by wrapping multiple transmission belts around a pulley, etc. (during multi-running travel), it is possible to suppress differences in tension and elongation due to the tension between the multiple transmission belts. it can. Thereby, it can suppress that the transmission belt which reaches | attains a lifetime early because tension | tensile_strength acts excessively arises. Moreover, it is possible to suppress the occurrence of a transmission belt that reaches an early life due to wear due to slip as a result of a tension drop caused by a large elongation.

  (12) Preferably, the core body includes a plurality of the sheet materials that are stacked in the thickness direction of the transmission belt.

  According to this structure, the core body of desired thickness can be easily formed by laminating | stacking a sheet | seat material. Thereby, it is not necessary to prepare in advance a plurality of types of sheet materials having different thicknesses according to the type of the transmission belt (difference in the size of the transmission belt, the tensile strength, etc.). As a result, preparation, labor and time for manufacturing the transmission belt can be reduced. Further, since it is not necessary to prepare a plurality of types of sheet materials, the space for the material storage in the transmission belt manufacturing factory can be used more widely. Further, since the work of replacing different types of sheet materials is not required, it is not necessary for the worker to frequently move a heavy bobbin around which the sheet materials are wound, and the heavy work can be reduced.

  (13) More preferably, the edges of portions of the sheet material adjacent to each other in the width direction of the transmission belt are abutted at a predetermined abutting position, and adjacent to the thickness direction of the transmission belt. The abutting position is shifted in the width direction of the transmission belt between the sheet materials.

  According to this configuration, the sheet material is wound in a more stable posture as compared with the case where the above-described butting positions are aligned in the width direction of the transmission belt. Thereby, at the time of use of a power transmission belt, each part of a core can receive tension more uniformly. Therefore, the dispersion | variation in the performance of a transmission belt can be suppressed more reliably.

  (14) Preferably, the transmission belt is arranged in a width direction of the belt portion as a plurality of endless belt portions each having the compression rubber layer and the core and formed as an endless shape. And a connecting portion that connects the plurality of belt portions.

  According to this configuration, in the so-called combined V-belt, the core body formed of the sheet material can be provided in the individual belt portions arranged in the width direction of the combined V-belt. Therefore, according to this configuration, it is possible to provide a combined V-belt that can increase the tension that the combined V-belt can practically receive, reduce variations in performance of the combined V-belt, and reduce the time required for manufacturing. Can be provided.

  (15) Preferably, the belt portion further includes an extended rubber layer disposed between the core body and the connecting portion.

  According to this configuration, the tension that can be practically applied to the combined V-belt can be further increased, and variations in the performance of the combined V-belt can be further reduced. Further, an extension side belt sleeve is provided between the core body and the connecting portion. Here, for example, a pair of coupled V-belts arranged so that the axial direction is directed in the vertical direction is used to sandwich a conveyed product such as a carrot leaf portion, and the conveyed product is rotated by driving the pair of coupled V-belts. A configuration for conveying in the belt circumferential direction is conceivable. In such a configuration, it is possible to impart sufficient strength to the combined V-belt that can more reliably suppress the slack (curvature due to sagging) of the combined V-belt.

  (16) Preferably, the connecting portion is formed using a bi-directional fiber sheet material including first fibers and second fibers that extend in two different directions, and the two different directions are These are the circumferential direction and the width direction of the transmission belt, or both are directions intersecting the circumferential direction.

  According to this configuration, the strength of the connecting portion can be further increased. Therefore, it is possible to suppress the occurrence of sagging even when the belt is long, and it is possible to realize a combined V-belt that can be gripped and conveyed without dropping accurately over a long period of time.

(17) The bi-directional fiber sheet material is formed using aramid fibers, and the basis weight of the bi-directional fiber sheet material is 90 to 870 (g / m ² ), the bi-directional fiber sheet material Even if at least one condition of the tensile strength of 2060 (N / mm ² ) or more and the thickness of the bi-directional fiber sheet material is 0.03 to 0.24 (mm) is satisfied Good.

(18) Moreover, the said bidirectional fiber sheet material is formed using carbon fiber, and the fabric weight of the said bidirectional fiber sheet material is 200-300 (g / m < ² >), The said bidirectional fiber At least one condition that the tensile strength of the sheet material is 2900 (N / mm ² ) or more and the thickness of the bidirectional fiber sheet material is 0.05 to 0.09 (mm) is satisfied. May be.

  According to the configurations of (17) and (18) above, it is possible to realize a configuration that can remarkably suppress the slack (curvature due to sagging) of the combined V-belt.

  According to the present invention, the tension that can be practically applied to the transmission belt can be increased, the variation in the performance of the transmission belt can be reduced, and the manufacturing time can be reduced.

It is sectional drawing of the transmission belt formed using the manufacturing method of the transmission belt concerning one Embodiment of this invention. (A) and (B) are a perspective view and a cross-sectional view, respectively, showing a process of winding an extension side belt sleeve (step S3) using a molding device. (A) And (B) is the perspective view and sectional view which respectively show the winding process (step S4) of the expansion | extension side adhesive belt sleeve using a shaping | molding apparatus. (A) and (B) are respectively a perspective view and a cross-sectional view showing a winding process (step S5) of a core body using a molding apparatus. (A) And (B) is the perspective view and sectional view which respectively show the winding process (step S6) of the compression side adhesive belt sleeve using a shaping | molding apparatus. (A) And (B) is the perspective view and sectional view which respectively show the winding process (step S7) of the compression side belt sleeve using a shaping | molding apparatus. (A) is sectional drawing which shows the cutting process (step S8) of an unvulcanized sleeve, (B) is sectional drawing which shows the skive process (step S9) of an unvulcanized sleeve. It is a flowchart for demonstrating an example of the formation process of a power transmission belt. (A) is a schematic plan view of the unidirectional sheet which comprises a sheet material, (B) is a schematic plan view of the bidirectional sheet which comprises a sheet material. It is sectional drawing of the transmission belt which concerns on one Embodiment of this invention, Comprising: The figure which showed the structure in detail rather than FIG. It is sectional drawing shown about the principal part of a modification. It is sectional drawing of the power transmission belt which concerns on a modification. It is sectional drawing of the joint V belt as a power transmission belt which concerns on 2nd Embodiment. It is the figure which looked at a part of joint V belt shown in FIG. 13 from the radial direction outer side, Comprising: It is a figure which shows typically the 1st fiber and 2nd fiber which are contained in a core with a thin continuous line. (A) And (B) is the perspective view and sectional drawing which respectively show the winding process (step S12) of the compression side belt sleeve using a shaping | molding apparatus. (A) And (B) is the perspective view and sectional drawing which respectively show the winding process (step S13) of the compression side adhesive belt sleeve using a shaping | molding apparatus. (A) And (B) is the perspective view and sectional drawing which respectively show the winding process (step S14) of the core using a shaping | molding apparatus. It is sectional drawing which shows the bias cut process (step S15) of an unvulcanized sleeve. (A) is sectional drawing which shows the jacket winding process (step S16) of an unvulcanized belt. Further, (B) is a cross-sectional view showing a step (step S17) of setting each unvulcanized belt around which the jacket cloth is wound in the groove portion of the lower vulcanization mold 6. It is sectional drawing which shows the process (step S18) of setting the tie band (step S18), and the vulcanization process (step S19) of each unvulcanized belt in the state where the tie band is set. It is sectional drawing which shows the process (step S20) which cuts a sleeve after a vulcanization for every predetermined width. It is a flowchart for demonstrating an example of the formation process of a joint V belt. It is a flowchart for demonstrating an example of the formation process of the joint V belt as a power transmission belt which concerns on the modification of 2nd Embodiment. (A) is sectional drawing which shows the process (step S21) which sets a jacket cloth to the mold for lower side vulcanization | cure. Further, (B) is a cross-sectional view showing a step (step S17) of setting each unvulcanized belt in the lower vulcanization mold. It is sectional drawing of the joint V belt as a power transmission belt which concerns on 3rd Embodiment. (A) is a schematic plan view of the bi-directional fiber sheet of the tie band, and (B) is a schematic plan view of another example of this bi-directional fiber sheet. It is a figure which shows typically a mode that a pair of joint V belt conveys a conveyed product. (A) is sectional drawing which shows the winding process (step S22) of a compression side belt sleeve, (B) is sectional drawing which shows the winding process (step S23) of a compression side adhesive belt sleeve, (C) is sectional drawing which shows the winding process (step S24) of a core. (A) is sectional drawing which shows the winding process (step S25) of an expansion | extension side adhesive belt sleeve, (B) is sectional drawing which shows the winding process (step S26) of an expansion | extension side belt sleeve. It is sectional drawing which shows the bias cut process (step S27) of an unvulcanized sleeve. (A) is sectional drawing which shows the outer covering cloth winding process (step S28) of an unvulcanized belt, (B) is a groove part of the lower vulcanization mold for each unvulcanized belt wound with an outer covering cloth. It is sectional drawing which shows the process (step S29) to set to. (A) is a sectional view showing a step of setting a tie band (step S30) and a vulcanization step (step S29) of each unvulcanized belt with the tie band set, (B) It is sectional drawing which shows the process (step S32) which cuts a sleeve after a vulcanization for every predetermined width. It is a flowchart for demonstrating an example of the formation process of a joint V belt. It is a flowchart for demonstrating an example of the formation process of the joint V belt as a power transmission belt which concerns on the modification of 3rd Embodiment. (A) is sectional drawing which shows the process (step S33) which sets a jacket cloth to the mold for lower vulcanization, (B) is the process of setting each unvulcanized belt to the mold for lower vulcanization. It is sectional drawing which shows (step S29). (A) is a schematic perspective view showing an unvulcanized belt formed when a conventional transmission belt is manufactured, and (B) is a non-vulcanized rubber sheet in which a core wire is wound. It is an expanded view which shows typically the unvulcanized rubber sheet of the state which was put. (A) is a schematic perspective view showing an unvulcanized belt formed when a conventional transmission belt is manufactured, and (B) is a non-vulcanized rubber sheet in which a core wire is wound. It is an expanded view which shows typically the unvulcanized rubber sheet of the state which was put.

  Hereinafter, embodiments of the present invention will be described. FIG. 1 is a cross-sectional view of a transmission belt 10 formed by using a transmission belt manufacturing method according to an embodiment of the present invention. Examples of power transmission belts manufactured by the power transmission belt manufacturing method of the present invention (this power transmission belt is also a power transmission belt according to an embodiment of the present invention) include friction power transmission belts such as V-belts, V-ribbed belts, and flat belts. can do. There are two types of V-belts: a low-edge type in which a rubber layer is exposed on the side surface for friction transmission, and a wrapped type in which the belt is covered with an outer cloth. In this embodiment, a case where an endless wrapped V-belt is manufactured as the transmission belt 10 will be described as an example.

  The transmission belt 10 includes an extension rubber layer 11, an extension side adhesive rubber layer 12, a core body 13, a compression side adhesive rubber layer 14, a compression rubber layer 15, and an outer cloth 16. A compression rubber layer 15, a compression side adhesive rubber layer 14, a core body 13, an extension side adhesive rubber layer 12, and an extension rubber layer 11 are arranged in this order from the radial inner side of the transmission belt 10.

  In the present embodiment, the width direction W1, the axial direction X1, the radial direction R1, and the circumferential direction C1 of the transmission belt 10 (each belt sleeve 101, 102, 104, 105 of the unvulcanized sleeve 106 described later) are simply set. , “Width direction W1”, “axial direction X1”, “radial direction R1”, and “circumferential direction C1”.

  The compressed rubber layer 15 is a long rubber layer having the same length as that of the transmission belt 10, and a cross-sectional shape perpendicular to the longitudinal direction is formed in a substantially trapezoidal shape as shown in FIG. Examples of the material of the compressed rubber layer 15 include natural rubber (NR) and styrene butadiene rubber (SBR).

  The compression-side adhesive rubber layer 14 is provided to connect the compression rubber layer 15 and the core body 13 and is disposed on the outer peripheral side of the compression rubber layer 15. The compression-side adhesive rubber layer 14 has a substantially trapezoidal cross-sectional shape perpendicular to the longitudinal direction. Examples of the material for the compression-side adhesive rubber layer 14 include the same materials as the material for the compression rubber layer 15.

  The core 13 is provided as a part of the transmission belt 10 that mainly receives tension acting on the transmission belt 10. In other words, the core body 13 functions as a reinforcing member that prevents the transmission belt 10 from being broken. Examples of the material of the core body 13 include polyester fibers, glass fibers, carbon fibers, and aramid fibers. The core body 13 is disposed at the radial intermediate portion of the transmission belt 10, and is disposed over the entire width direction of the transmission belt 10 at the intermediate portion. Thus, the core 13 is formed in a flat shape in the width direction of the transmission belt 10, and can receive tension in a balanced manner over the entire region in the width direction. An extension-side adhesive rubber layer 12 is disposed on the outer peripheral side of the core body 13.

  The stretch-side adhesive rubber layer 12 is provided to connect the stretch rubber layer 11 and the core body 13 together. The stretch-side adhesive rubber layer 12 has a substantially trapezoidal cross-sectional shape perpendicular to the longitudinal direction. Examples of the material for the stretch-side adhesive rubber layer 12 include the same materials as those for the compression rubber layer 15.

  The stretched rubber layer 11 is a long rubber layer that is substantially the same length as the compressed rubber layer 15, and is laminated on the compressed rubber layer 15 with the core 13 sandwiched between the compressed rubber layer 15. It has the structure which was made. The stretchable rubber layer 11 has a substantially trapezoidal cross-sectional shape perpendicular to the longitudinal direction. Examples of the material of the stretch rubber layer 11 include the same materials as the material of the compression rubber layer 15.

  The jacket cloth 16 includes an inner cover 17 and an outer cover 18. The inner cover 17 and the outer cover 18 are provided as a canvas covering the compression rubber layer 15, the compression side adhesive rubber layer 14, the core body 13, the extension side adhesive rubber layer 12, and the extension rubber layer 11. The inner cover 17 is provided so as to cover the outer surface of the compression rubber layer 15, the compression side adhesive rubber layer 14, the core body 13, the extension side adhesive rubber layer 12, and the extension rubber layer 11. Furthermore, it is provided so as to cover the outer surface of the inner cover 17.

  2 to 7 are perspective views showing a conceptual configuration of a transmission belt forming apparatus 1 for manufacturing a transmission belt 10 according to an embodiment of the present invention, and the transmission belt forming apparatus 1 forms the transmission belt 10. 2 is a cross-sectional view showing a main part of the transmission belt 10. FIG. In the following description, the transmission belt forming apparatus 1 may be simply referred to as the forming apparatus 1. FIG. 8 is a flowchart for explaining an example of a forming process of the transmission belt.

  FIG. 2A and FIG. 2B are a perspective view and a cross-sectional view showing a winding step (step S3) of the extension side belt sleeve 101 using the molding apparatus 1, respectively. FIG. 3A and FIG. 3B are a perspective view and a cross-sectional view, respectively, showing the winding step (step S4) of the stretch-side adhesive belt sleeve 102 using the molding apparatus 1. FIG. 4A and FIG. 4B are a perspective view and a cross-sectional view showing a winding process (step S5) of the core body 13 using the molding apparatus 1, respectively. FIG. 5A and FIG. 5B are a perspective view and a cross-sectional view showing a winding step (step S6) of the compression-side adhesive belt sleeve 104 using the molding apparatus 1, respectively. FIG. 6A and FIG. 6B are a perspective view and a cross-sectional view, respectively, showing the step of winding the compression side belt sleeve 105 using the molding apparatus 1 (step S7). FIG. 7A is a cross-sectional view showing the cutting process (step S8) of the unvulcanized sleeve 106. FIG. FIG. 7B is a cross-sectional view showing the skive process (step S9) of the unvulcanized sleeve 106.

  Referring to FIG. 8, when the transmission belt 10 having the above configuration is manufactured, first, in order to form an unvulcanized rubber sheet 101 that becomes the stretched rubber layer 11, the raw rubber is subjected to a rolling process. (Step S1). In this rolling process, a ribbon-like rubber 110 (see FIG. 2A) having a width shorter than the width of the unvulcanized belt sleeve (extension-side belt sleeve 101) to be the extension rubber layer 11 is formed. Note that the ribbon-shaped rubber 110 may be formed by forming a sheet having a width larger than the width of the ribbon-shaped rubber 110 by rolling, and cutting the sheet every predetermined width.

  Next, the ribbon-shaped rubber 110 formed into a strip shape by rolling is wound around the rubber bobbin 2 by a predetermined length. Then, the ribbon-shaped rubber 110 wound around the rubber bobbin 2 for a predetermined length is cut with respect to the ribbon-shaped rubber 110 extending from the rolling machine (step S2).

  Next, as shown in FIG. 2 (A) and FIG. 2 (B), the cut rubber ribbon 110 is spirally wound around the outer periphery of the mantle 5 of the molding apparatus 1 so that the raw rubber is unvulcanized. The stretchable belt sleeve 101 is formed, and the unvulcanized stretchable belt sleeve 101 is held in a circular shape by the mantle 5. That is, the winding process of the extension side belt sleeve 101 is performed (step S3). This winding step is for holding the extension side belt sleeve 101 in a circular shape by supporting the extension side belt sleeve 101 having flexibility as a processing target from the inner peripheral side of the extension side belt sleeve 101. This is a step of winding the extension side belt sleeve 101 around the mantle 5.

  Next, as shown in FIGS. 3 (A) and 3 (B), a ribbon-like rubber 110 is further spirally wound around the outer peripheral portion of the extension-side belt sleeve 101 wound around the mantle 5, so that the extension side The adhesive belt sleeve 102 is formed (step S4).

  Next, as shown in FIGS. 4A and 4B, a core body that forms the core body 13 on the extension-side adhesive belt sleeve 102 by winding a sheet material 115 around the outer periphery of the extension-side adhesive belt sleeve 102. A formation process is performed (step S5). In the core forming step, the sheet material 115 wound around the sheet material bobbin 3 is unwound from the sheet material bobbin 3 as the extension side belt sleeve 101 and the extension side adhesive belt sleeve 102 rotate by the mantle 5. Then, the core body 13 drawn out from the sheet material bobbin 3 is spirally wound around the extension-side adhesive belt sleeve 102.

  Next, as shown in FIGS. 5A and 5B, the compression-side adhesive belt sleeve 104 is formed by further winding a ribbon-shaped rubber 110 around the outer periphery of the core body 13 in a spiral shape. (Step S6).

  Next, as shown in FIGS. 6 (A) and 6 (B), a winding step of the compression side belt sleeve 105 which becomes the compression rubber layer of the transmission belt is performed (step S7). In this step, the ribbon-shaped rubber 110 is wound around the outer peripheral portion of the compression side adhesive belt sleeve 104. Thereby, the unvulcanized sleeve 106 is completed. Thus, the unvulcanized sleeve 106 (a laminate of the extension side belt sleeve 101, the extension side adhesive belt sleeve 102, the core 13, the compression side adhesive belt sleeve 104, and the compression side belt sleeve 105) is placed on the mantle 5. It is formed.

  Next, as shown in FIG. 7A, a cutting process is performed (step S8). In the cutting step, the unvulcanized sleeve 106 is cut at predetermined intervals along the axial direction X1 by a cutter (not shown). Thereby, the unvulcanized belt 100 which consists of a part of unvulcanized sleeve 106 is manufactured.

  Next, as shown in FIG. 7B, a skive process is performed (step S9). In the skive process, an operation of cutting both side surfaces of the unvulcanized belt 100 is performed so that the unvulcanized belt 100 has a V-shaped cross section. Next, a cover winding process is performed (step S10). In the cover winding process, the covering cloth 16 is wound around the unvulcanized belt 100 that has undergone the skive process. Next, a vulcanization process is performed on the unvulcanized belt 100 around which the jacket cloth 16 is wound while being held by a predetermined mold (step S11). Thereby, the rubber part of the unvulcanized belt 100 is vulcanized, and as a result, the transmission belt 10 is completed.

  As described above, so-called reverse molding is performed in the present embodiment. More specifically, referring to FIG. 1 and FIG. 6, as a belt sleeve, an extension side belt sleeve 101 arranged to be the extension rubber layer 11 of the transmission belt 10, and a compression rubber layer 15 of the transmission belt 10. And a compression side belt sleeve 105 arranged so as to become. Then, after the extension side belt sleeve 101 is formed on the mantle 5 (step S3), the core body 13 is formed (step S5). Laminated on the mantle 5 on the side. Thereby, the compression side belt sleeve 105 is formed (step S7).

  Next, the process of forming the unvulcanized sleeve 106 will be described more specifically. In the following, among the processes for forming the unvulcanized sleeve 106, the extension side belt sleeve winding process (step S3), the extension side adhesive belt sleeve winding process (step S4), and the core body winding process (step S5). ), The compression-side adhesive belt sleeve winding step (step S6), and the compression-side belt sleeve winding step (step S7) will be described more specifically.

  2A, FIG. 2B, FIG. 3A, FIG. 3B, FIG. 5A, FIG. 5B, FIG. 6A, and FIG. Referring to, an extension side belt sleeve winding step (step S3), an extension side adhesive belt sleeve winding step (step S4), a compression side adhesive belt sleeve winding step (step S6), and a compression side belt sleeve winding. Each of the hanging steps (step S7) is an example of “a belt sleeve forming step for forming an unvulcanized belt sleeve having a predetermined thickness on the outer periphery of the mantle”. Among them, in particular, the extension side adhesive belt sleeve winding step (step S4) and the compression side adhesive belt sleeve winding step (step S6) are respectively "belts configured to contact the core body" of the present invention. It is an example of a “belt sleeve forming step for forming a sleeve”.

  In the present embodiment, examples of the thickness T110 of the ribbon-shaped rubber 110 include 0.5 mm to 2.0 mm. Moreover, 10 mm-50 mm can be illustrated as width W110 of the ribbon-shaped rubber 110. FIG. Moreover, as a width | variety of the unvulcanized sleeve 106, 600 mm-1200 mm can be illustrated.

  In these steps S3, S4, S6, and S7, a ribbon-shaped rubber 110 having a width W110 that is shorter than the width of the unvulcanized sleeve 106 is wound around the mantle 5 a plurality of times. In these steps S3, S4, S6 and S7, the ribbon-shaped rubber 110 is spirally wound around the mantle 5, respectively.

  Referring to FIGS. 2A and 2B, in the extension side sleeve winding step (step S <b> 3), first, an operator fixes one end of ribbon-like rubber 110 to mantle 5. From this state, the ribbon-shaped rubber 110 is attracted to the mantle 5 and wound around the mantle 5 by the rotation of the mantle 5 by a driving force from an electric motor (not shown). Furthermore, the ribbon-shaped rubber 110 is wound spirally by displacing the position where the ribbon-shaped rubber 110 is wound around the mantle 5 along the axial direction X1.

  In this embodiment, the extension side belt sleeve 101 having a relatively small thickness is formed by winding the ribbon-like rubber 110 around the mantle 5 in one layer (ply). In this case, the ribbon-shaped rubbers 110 adjacent to each other in the direction parallel to the axial direction X1 are wound around the mantle 5 so as not to overlap each other in the radial direction R1. In this case, the width W110 of the ribbon-shaped rubber 110 is set to be the same as the pitch P110 around which the ribbon-shaped rubber 110 is wound in the mantle 5. As a result, the ribbon-shaped rubber 110 is wound around the mantle 5 in a state where the ribbon-shaped rubbers 110 adjacent to each other in the direction parallel to the axial direction X1 are in close contact with each other.

  The extension side belt sleeve 101 formed of one layer of ribbon-like rubber 110 is completed on the outer periphery of the mantle 5 by the above process. After the extension side belt sleeve 101 is completed, the ribbon rubber 110 at a position before being wound around the mantle 5 is cut by a cutter (not shown).

  Referring to FIGS. 3A and 3B, in the extension-side adhesive belt sleeve winding step (step S4), the worker can move one end portion of ribbon-like rubber 110 in the same manner as in step S3. Is fixed to the mantle 5. From this state, the ribbon-shaped rubber 110 is spirally wound by the same operation as the operation in step S3.

  In this embodiment, the extension-side adhesive belt sleeve 102 having a relatively small thickness is formed by winding the ribbon-like rubber 110 around the mantle 5 in one layer (ply). In this case, the ribbon-shaped rubber 110 is wound around the mantle 5 so as to avoid the ribbon-shaped rubbers 110 adjacent in the direction parallel to the axial direction X1 from overlapping each other in the radial direction R1. In this case, the width W110 of the ribbon-shaped rubber 110 is set to be the same as the pitch P110 around which the ribbon-shaped rubber 110 is wound in the mantle 5. As a result, the ribbon-shaped rubber 110 is wound around the mantle 5 in a state where the ribbon-shaped rubbers 110 adjacent to each other in the direction parallel to the axial direction X1 are in close contact with each other.

  At this time, the advancing direction D101 of the ribbon-shaped rubber 110 when the extension side belt sleeve 101 is formed and the advancing direction D102 of the ribbon-like rubber 110 when the extension side adhesive belt sleeve 102 is formed are set opposite to each other. For example, the traveling direction D101 is a direction from one end of the mantle 5 to the other end along the axial direction X1, and the traveling direction D102 is a direction from the other end of the mantle 5 to one end along the axial direction X1.

  Through the above steps, the extension-side adhesive belt sleeve 102 formed of one layer of ribbon-like rubber 110 is completed on the outer periphery of the mantle 5 and the extension-side belt sleeve 101. After the extension side adhesive belt sleeve 102 is completed, the ribbon-like rubber 110 is cut with a cutter (not shown).

  4A and 4B, in the core body forming step (step S5), the sheet material 115 is wound spirally. As described above, the sheet material 115 is a fibrous material formed using polyester fiber, glass fiber, carbon fiber, aramid fiber, or the like. The sheet material 115 is formed in an elongated ribbon shape, and the width W115 of the sheet material 115 is set larger than the thickness T115 of the sheet material 115. The sheet material 115 is formed in a ribbon shape.

  In the present embodiment, the width W115 of the sheet material 115 is set to be the same as the width W110 of the ribbon-like rubber 110. The width W115 of the sheet material 115 may be less than the width W110 of the ribbon-shaped rubber 110, or may be larger than the width W110 of the ribbon-shaped rubber 110. In the present embodiment, the thickness T115 of the sheet material 115 is set to be the same as the thickness T110 of the ribbon-like rubber 110. In addition, the thickness T115 of the sheet material 115 may be less than the thickness T110 of the ribbon-shaped rubber 110, or may be larger than the thickness T110 of the ribbon-shaped rubber 110.

For example, as shown in the plan view of FIG. 9A, the sheet material 115 is formed using a unidirectional sheet 116 configured such that fibers mainly extend in one direction. The unidirectional sheet 116 extends along the longitudinal direction (spiral direction) of the sheet material 115 when the sheet material 115 is wound around the mantle 5 (extension side adhesive belt sleeve 102). The unidirectional sheet 116 thus extends substantially in one direction and is configured to withstand higher tension. In the unidirectional sheet 116, fibers adjacent to each other in the width direction W1 may be joined by a joint member such as a joint 116a. When the sheet material 115 is such a unidirectional sheet 116 and is formed of an aramid fiber, the sheet material 115 has a thickness T115 of about 0.193 mm to 0.572 mm and a tensile strength of 2060 (N / mm ^2). ) May be set above. Further, when the sheet material 115 is a unidirectional sheet 116 and is formed of an aramid fiber, the sheet material 115 has a thickness T115 of about 0.169 mm to 0.504 mm and a tensile strength of 2350 (N / mm ² ). It may be set above.

In addition, the sheet material 115 may be formed of a unidirectional sheet and carbon fiber. For example, the sheet material 115 may be formed of a unidirectional sheet and high-strength carbon fiber. In this case, the sheet material 115 has a thickness T115 of about 0.111 mm to 0.333 mm and a tensile strength of 3400. It may be set to (N / mm ² ) or more. Further, the sheet material 115 may be formed of a unidirectional sheet and medium elastic carbon fiber. In this case, the sheet material 115 has a thickness T115 of about 0.165 mm to 0.248 mm and a tensile strength of 2900. It may be set to (N / mm ² ) or more.

In addition, the sheet material 115 may be formed of polyethylene. When the sheet material 115 is formed of high-strength polyethylene, the sheet material 115 has a thickness T115 of about 0.3 mm, a tensile strength of 423 (N / mm ² ) or more, and an elongation at break. It may be set to about 7 (%).

  Note that the sheet material 115 may be formed using, for example, a two-way sheet material 117 configured such that fibers extend in two directions as shown in the plan view of FIG. 9B. The bi-directional sheet material 117 includes a portion extending along the longitudinal direction (spiral direction) of the sheet material 115 when the sheet material 115 is wound around the mantle 5 (extension side adhesive belt sleeve 102), and the longitudinal direction of the sheet material 115. And a portion extending along a direction orthogonal to the direction (axial direction X1, width direction W1). Thus, the bi-directional sheet material 115 has a substantially bi-directional directionality, and is configured to be able to withstand higher tension by a combination of the portions orthogonal to each other in the extending direction. .

  Referring to FIGS. 4A and 4B again, in the core body forming step (step S5) in which the sheet material 115 is used, first, an operator places one end of the sheet material 115 on the mantle 5 Secure to. From this state, the rotation of the mantle 5 causes the sheet material 115 to be attracted to the mantle 5 and wound around the mantle 5. Furthermore, the sheet material 115 is wound spirally by displacing the position where the sheet material 115 is wound around the mantle 5 along the axial direction X1. Thereby, the core 13 is formed.

  In this embodiment, the core 13 having a relatively small thickness is formed by winding the sheet material 115 around the mantle 5 by one layer (ply). In this case, the mantle 5 avoids the sheet materials 115 adjacent to each other in the direction parallel to the axial direction X1 of the mantle 5 (the portions adjacent to the width direction W1 of the sheet material 115) from each other in the radial direction R1. 5. It is wound around the extension side belt sleeve 101 and the extension side adhesive belt sleeve 102. In this case, the pitch P115 around which the sheet material 115 is wound around the extension side belt sleeve 101 is set to be the same as the width W115 of the sheet material 115. Accordingly, the sheet material 115 is wound around the mantle 5 in a state where the sheet materials 115 adjacent in the direction parallel to the axial direction X1 are in close contact with each other.

  At this time, the advancing direction D102 of the ribbon-shaped rubber 110 when the extension-side adhesive belt sleeve 102 is formed and the advancing direction D13 of the sheet material 115 when the core body 13 is formed are set opposite to each other. For example, the traveling direction D102 is a direction from the other end of the mantle 5 toward one end along the axial direction X1, and the traveling direction D13 is a direction from the one end of the mantle 5 toward the other end along the axial direction X1.

  Through the above steps, the core body 13 formed of the one-layer sheet material 115 is completed on the outer periphery of the mantle 5. After the core body 13 is completed, the sheet material 115 at a position before being wound around the mantle 5 is cut by a cutter (not shown).

  Referring to FIGS. 5A and 5B, next, in the compression-side adhesive belt sleeve winding step (step S6), the worker makes the ribbon-shaped rubber 110 in the same manner as the operation in step S3. Is fixed to the mantle 5. From this state, the ribbon-shaped rubber 110 is spirally wound by the same operation as the operation in step S3.

  In the present embodiment, the compression-side adhesive belt sleeve 104 having a relatively small thickness is formed by winding the ribbon-like rubber 110 around the mantle 5 in one layer (ply). In this case, the ribbon-shaped rubber 110 is wound around the mantle 5 so as to avoid the ribbon-shaped rubbers 110 adjacent in the direction parallel to the axial direction X1 from overlapping each other in the radial direction R1. In this case, the width W110 of the ribbon-shaped rubber 110 and the pitch P110 around which the ribbon-shaped rubber 110 is wound in the mantle 5 are set to be the same. As a result, the ribbon-shaped rubber 110 is wound around the mantle 5 in a state where the ribbon-shaped rubbers 110 adjacent to each other in the direction parallel to the axial direction X1 are in close contact with each other.

  Through the above steps, the compression-side adhesive belt sleeve 104 formed of a single layer of ribbon-like rubber 110 is completed on the outer periphery of the mantle 5. After the compression-side adhesive belt sleeve 104 is completed, the ribbon-like rubber 110 at a position before being wound around the mantle 5 is cut with a cutter (not shown).

  At this time, the advancing direction D13 of the sheet material 115 at the time of forming the core body 13 and the advancing direction D104 of the ribbon-like rubber 110 at the time of forming the compression side adhesive belt sleeve 104 are set to be opposite to each other. For example, the traveling direction D13 is a direction from one end of the mantle 5 to the other end along the axial direction X1, and the traveling direction D104 is a direction from the other end of the mantle 5 to one end along the axial direction X1.

  As described above, of the ribbon-like rubber 110 in the extension-side adhesive belt sleeve 102, the edges 102a of the portions adjacent to each other in the width direction W1 are abutted at the predetermined abutting position B102. The butting position B102 extends in a spiral shape on the outer peripheral side of the mantle 5. Similarly, edge portions 115a of portions adjacent to each other in the width direction W1 of the sheet material 115 in the core body 13 are abutted at a predetermined abutting position B115. The butting position B115 extends in a spiral shape on the outer peripheral side of the mantle 5. Similarly, edge portions 104a of portions adjacent to each other in the width direction W1 of the ribbon-like rubber 110 in the compression-side adhesive belt sleeve 104 are abutted at a predetermined abutting position B104. The butting position B104 extends in a spiral shape on the outer peripheral side of the mantle 5.

  The butting position B115 of the sheet material 115 and the butting position B102 of the ribbon-like rubber 110 in the extension-side adhesive belt sleeve 102 are shifted in the width direction W1. Similarly, the butting position B115 of the sheet material 115 and the butting position B104 of the ribbon-like rubber 110 in the compression-side adhesive belt sleeve 104 are shifted in the width direction W1.

  In this embodiment, in the cross section orthogonal to the circumferential direction C1 of the unvulcanized sleeve 106 (the cross section shown in FIG. 6B), the butting position B115 is a pair of butts adjacent to the width direction W1. You may arrange | position in the center of position B102, B102, and may arrange | position near one of a pair of butting positions B102, B102. Similarly, in the cross section shown in FIG. 6B, the butting position B115 may be arranged at the center of a pair of butting positions B104 and B104 adjacent in the width direction W1, or the pair of butting positions B104 and B104. It may be arranged closer to either one. Note that the butting position B102 and the butting position B104 in the width direction W1 may be aligned or may be shifted.

  In the present embodiment, edge portions 101a of portions adjacent to each other in the width direction W1 of the ribbon-like rubber 110 in the extension side belt sleeve 101 are abutted at a predetermined abutting position B101. The butting position B101 extends spirally on the outer peripheral side of the mantle 5, and is disposed over the entire area of the ribbon-like rubber 110 in the extension side belt sleeve 101. The butting position B101 and the butting position B115 of the sheet material 115 are shifted in the width direction W1.

  6A and 6B, in the compression side belt sleeve winding step (step S7), as in the operation in step S3, the worker removes one end of the ribbon-like rubber 110. Secure to mantle 5. From this state, the ribbon-shaped rubber 110 is spirally wound by the same operation as the operation in step S3.

  In the present embodiment, the compression-side belt sleeve 105 having a relatively large thickness is formed by winding a plurality of layers (for example, 2 to 8 layers, 6 layers in the present embodiment) of the ribbon-shaped rubber 110 around the mantle 5. . In this case, the ribbon-like rubber 110 is laminated in the radial direction R1 of the mantle 5 to form the compression side belt sleeve 105. Further, the ribbon-shaped rubber 110 is wound around the mantle 5 so as to prevent the ribbon-shaped rubbers 110 adjacent in the direction parallel to the axial direction X1 from overlapping each other in the radial direction R1 of the mantle 5. The pitch P110 around which the ribbon rubber 110 is wound is set to be the same as the width W110 of the ribbon rubber 110.

  The ribbon-shaped rubber 110 may be wound around the mantle 5 so that a part of the ribbon-shaped rubber 110 adjacent to each other in the direction parallel to the axial direction X1 overlaps each other in the radial direction R1. In this case, the pitch at which the ribbon-shaped rubber 110 is wound in the mantle 5 is set smaller than the width W110 of the ribbon-shaped rubber 110.

  In this embodiment, the ribbon-shaped rubber 110 is formed when the compression-side adhesive belt sleeve 104 is formed, and the traveling direction D104 of the ribbon-shaped rubber 110 and when the first layer of the compression-side belt sleeve 105 that contacts the compression-side adhesive belt sleeve 104 is formed. 110 is set opposite to the traveling direction D105. For example, the traveling direction D104 is a direction from the other end of the mantle 5 toward one end along the axial direction X1, and the traveling direction D105 is a direction from the one end of the mantle 5 toward the other end along the axial direction X1.

  Through the above steps, a compression side belt sleeve 105 formed of a plurality of layers of ribbon-like rubber 110 is completed on the outer periphery of the mantle 5. After the compression side belt sleeve 105 is completed, the ribbon rubber 110 at a position before being wound around the mantle 5 is cut by a cutter (not shown). Thereby, the unvulcanized sleeve 106 is completed. In addition, the thickness of the unvulcanized sleeve 106 is less than the design value at both ends of the unvulcanized sleeve 106 in the direction parallel to the axial direction X1, and these both ends are cut (step S8). After being cut in, it is discarded or reused.

  In the present embodiment, the ply number of the ribbon-like rubber 110 constituting the extension side belt sleeve 101 is not limited to 1 and can be 1 to 3. Further, the number of ply of the ribbon-like rubber 110 constituting the compression side belt sleeve 105 is not limited to 6, and can be 2 to 8.

  FIG. 10 is a cross-sectional view of the transmission belt 10 according to an embodiment of the present invention. Compared to the cross-sectional view shown in FIG. 1, the stretch rubber layer 11, the stretch-side adhesive rubber layer 12, the core 13, and the compression side 3 is a diagram showing in detail the configuration of an adhesive rubber layer 14 and a compressed rubber layer 15. FIG. The transmission belt 10 shown in FIG. 10 can be manufactured by the above-described manufacturing method, but is not limited thereto, and can be manufactured by other methods.

  Each rubber layer 11, 12, 14, and 15 is formed by winding the ribbon-shaped rubber 110 in a spiral shape as described above, and the core body 13 is formed by winding the sheet material 115 in a spiral shape as described above. Formed by being. Thereby, in the cross section of the transmission belt 10, with reference to FIG. 10, the cross section of the ribbon-shaped rubber 110 which comprises each rubber layer 11, 12, 14, 15 is shown for every rubber layer 11, 12, 14, 15. In addition, the shape is arranged in a line in the width direction W1. Similarly, in the cross section of the transmission belt 10, the cross section of the sheet | seat material 115 which comprises the core body 13 becomes a shape which was located in a line in the width direction W1 with reference to FIG.

  Referring to FIG. 10, in core 13, the width direction of sheet material 115 is along the width direction W <b> 1 of transmission belt 10, and the thickness direction of sheet material 115 is along the thickness direction (radial direction R <b> 1) of transmission belt 10. It is in a state. Referring to FIG. 10, in the core body 13, portions of the sheet material 115 adjacent to each other in the width direction W <b> 1 are in a state of being butted in the width direction W <b> 1. In other words, in the core 13, portions of the sheet material 115 adjacent to each other in the width direction W <b> 1 do not overlap in the thickness direction (radial direction R <b> 1) of the transmission belt 10.

  As described above, according to the present embodiment, the width W115 of the used sheet material 115 is set larger than the thickness T115 of the sheet material 115 in the core body forming step (step S5). According to this configuration, the core body 13 is formed by winding the wide flat sheet material 115 around the extension-side adhesive belt sleeve 102 in the core body forming step (step S5). For this reason, the area | region where the core 13 exists in the width direction W1 can be made wider. In the present embodiment, after the unvulcanized sleeve 106 including the unvulcanized belt sleeves 101, 102, 104, and 105 and the core body 13 is formed, the unvulcanized sleeve 106 is cut every predetermined width, The unvulcanized belt 100 is formed by performing a skive operation for cutting the cut member to have a V-shaped cross section. As described above, since the region where the core body 13 exists in the width direction W1 is wide, the core body is formed on both side surfaces (surfaces facing the sheave surface of the pulley, both end surfaces in the width direction W1) of the unvulcanized belt 100. 13 will appear continuously in the circumferential direction C1 of the unvulcanized belt 100. Thereby, in each side surface of the unvulcanized belt 100, the core body 13 appears in a sufficient length in the circumferential direction of the unvulcanized belt. As a result, the core 13 can receive sufficient tension on the side surface of the transmission belt 10 that is completed when the unvulcanized belt 100 is subjected to vulcanization treatment or the like. Thereby, the tension that the transmission belt 10 can practically receive can be further increased. Furthermore, since the area | region where the core body 13 exists in the width direction W1 is wide, the situation where the core body 13 appears intermittently in the circumferential direction C1 can be prevented more reliably on both side surfaces of the unvulcanized belt 100. Therefore, it is possible to suppress the occurrence of individual differences in the tension that can be received by the core body 13 on the side surface of the transmission belt 10. Thereby, the dispersion | variation in the performance of the transmission belt 10 can be decreased more. Furthermore, since the sheet material 115 has a wide shape, it is possible to reduce the number of times the sheet material 115 is wound around the extension-side adhesive belt sleeve 102. Therefore, since the time required for forming the core body 13 can be reduced, the time required for manufacturing the transmission belt 10 can be further reduced. Furthermore, when it is intended to form a transmission belt that can withstand a high load, it is not necessary to use a thick core wire as in the prior art, and since the core 13 having a relatively thin thickness is used, the transmission belt 10 is wound around a pulley. It is difficult to deform greatly during use, and the shear stress generated inside is relatively small. Therefore, peeling at the interface between different layers is less likely to occur.

  Further, according to the present embodiment, the sheet material 115 is wound around the expansion-side adhesive belt sleeve 102 so as to avoid the portions of the sheet material 115 adjacent to each other in the width direction W1 from overlapping each other in the radial direction R1. According to this configuration (that is, according to the configuration in which the portions of the sheet material 115 adjacent to each other in the width direction of the transmission belt 10 do not overlap in the thickness direction of the transmission belt 10), the sheet material 115 adjacent to the width direction W1 is They can be arranged in a line along the width direction W1. As a result, it is possible to prevent one of the adjacent sheet materials 115 from riding on the other. Thereby, the core body 13 can be arrange | positioned more uniformly along the width direction W1. Therefore, when tension is applied to the transmission belt 10, this tension can be received more evenly in the width direction W <b> 1 by the core body 13. Thereby, the bias | inclination of the tension | tensile_strength received in the transmission belt 10 can be suppressed. As a result, when power is transmitted by wrapping a plurality of transmission belts 10 on a pulley or the like (during multi-running travel), there is a difference in tension between the plurality of transmission belts 10 and elongation due to the tension. Can be suppressed. Thereby, it can suppress that the transmission belt 10 which reaches | attains a lifetime early because tension | tensile_strength acts excessively arises. Further, it is possible to suppress the occurrence of the transmission belt 10 that reaches an early life due to wear due to slip as a result of an early drop in tension due to large elongation.

  For example, in a transmission belt having a conventional configuration, that is, a configuration in which a core wire is disposed between the compression rubber layer and the stretch rubber layer, when the thin core wire is wound around the belt sleeve serving as the compression rubber layer, The position is likely to deviate from the designed position. For this reason, the position of the core wire in the width direction of the belt sleeve is likely to shift. As a result, the position of the core wire is varied in one unvulcanized belt formed by cutting the belt sleeve every predetermined width. Further, the effective number of core wires (the number of core wires on the cut surface) varies among a plurality of unvulcanized belts. Causes of such variations include variations in pitch when winding the core wire, variations in core wire diameter, and meandering of the core wire with respect to the belt sleeve. If the effective number of the core wires is different among the plurality of transmission belts, the tensile elongation amount when tension is applied to these transmission belts is different. When a plurality of transmission belts with different elongation amounts are hung on a pulley or the like and run, sufficient power transmission cannot be performed due to a difference in tension between the multiple transmission belts. As a result, the over-tensioned belt reaches the end of its life early. In addition, a transmission belt having a large amount of elongation reduces the tension that can be transmitted at an early stage, and the service life is quickly reached from wear due to slip traveling. On the other hand, as described above, the sheet material 115 is wound around the expansion-side adhesive belt sleeve 102 so as to avoid the portions adjacent to each other in the width direction W1 of the sheet material 115 overlapping each other in the radial direction of the core body 13. Thus, it is possible to manufacture the transmission belt 10 in which such a tension imbalance is suppressed.

  Further, according to the present embodiment, the pitch P 115 around which the sheet material 115 is wound around the extension-side adhesive belt sleeve 102 is set to be the same as the width W 115 of the sheet material 115. According to this configuration, the sheet materials 115 adjacent to each other in the width direction W1 are wound around the extension-side adhesive belt sleeve 102 with no gap in the width direction W1. As a result, the core body 13 can be disposed over the entire area between both side surfaces of the transmission belt 10 regardless of the type of the transmission belt 10 (such as the thickness of the core body). Thereby, the operation | work which changes the pitch P115 which winds the core body 13 around the expansion | extension side adhesion belt sleeve 102 according to the kind of transmission belt 10 becomes unnecessary. As a result, it is possible to prevent errors such as inappropriate setting of the pitch due to an operation error when changing the pitch of winding the core body 13 around the extension-side adhesive belt sleeve 102 according to the type of the transmission belt 10. As a result, it is possible to reduce labor during manufacturing of the transmission belt 10 and reduce the occurrence of defective products.

  For example, in a transmission belt having a conventional configuration, that is, a configuration in which a core wire is disposed between the compression rubber layer and the stretch rubber layer, the pitch when winding the core wire around the belt sleeve depends on the diameter of the core wire, etc. Need to be set. For this reason, it takes time and effort to set the pitch, and there is a possibility that an error in setting the pitch may occur. On the other hand, as described above, according to the present embodiment, by making the width W115 of the sheet material 115 and the pitch P115 around which the sheet material 115 is wound the same, the width W115 of the sheet material 115 and the pitch at which the sheet material 115 is wound around. P115 is uniquely determined. For this reason, both the trouble of setting the pitch P115 and the possibility of an erroneous setting of the pitch P115 can be reduced.

  Further, according to the present embodiment, the core body 13 is formed using the flat sheet material 115, and the width W115 of the sheet material 115 and the pitch P115 around which the sheet material 115 is wound are made the same, so that the width direction W1. It can suppress more reliably that one of the sheet | seat materials 115 adjacent to runs on the other. Accordingly, it is possible to suppress the occurrence of an operation of correcting the portion that has been ridden to a position where it is not ridden when the sheet material 115 has been ridden. Thereby, the effort concerning manufacture of the transmission belt 10 can be reduced more.

  Further, for example, in a transmission belt having a conventional configuration, that is, a configuration in which a core wire is disposed between the compression rubber layer and the stretch rubber layer, the pitch when the core wire is wound around the belt sleeve is approximately equal to the diameter of the core wire. There is the same case. In this case, although the pitch is set slightly larger than the diameter of the core wire, a phenomenon in which one of the core wires adjacent in the width direction of the belt sleeve rides on the other tends to occur. Such a ride-up is caused by the fact that an error is likely to occur in the position at which the core wire is wound and the diameter of the core wire varies. Then, when the running of the core line occurs, it is necessary to correct the portion that has been ridden to a position where it is not ridden. On the other hand, as described above, according to the present embodiment, by setting the width W115 of the sheet material 115 and the pitch P115 around which the sheet material 115 is wound to be the same, it is possible to suppress such riding.

  Further, according to this embodiment, the ribbon-like rubber 110 is shorter than the width of each belt sleeve 101, 102, 104, 105. For this reason, at least one of the thickness and width of each belt sleeve 101, 102, 104, 105 can be adjusted by the mode in which the ribbon-shaped rubber 110 is wound around the mantle 5. Thereby, for example, by adjusting the mode in which the ribbon-shaped rubber 110 is wound around the mantle according to the thickness of the compression belt sleeve 105 to be the compression rubber layer 15 of the transmission belt 10, the compression rubber layer 15 having an arbitrary thickness can be realized. . This eliminates the need to prepare in advance a plurality of types of belt sleeves having different thicknesses depending on the type of thickness such as the compressed rubber layer 15. As a result, preparation, labor and time for manufacturing the transmission belt 10 can be reduced. In addition, since it is not necessary to prepare a plurality of types of belt sleeves, the space for the material storage in the transmission belt 10 manufacturing plant can be used more widely. Further, if the ribbon-like rubber 110 is used, the weight of the ribbon-like rubber 110 can be reduced. For this reason, unlike the case where the belt sleeve is formed with a single rubber sheet, it is not necessary to move the heavy rubber sheet while dragging it, and the possibility of foreign matter entering the rubber can be reduced, and the heavy rubber sheet is moved. It can eliminate heavy labor. Furthermore, the butting position B102 (B104) in the ribbon-shaped rubber 110 and the butting position B115 in the sheet material 115 are shifted in the width direction W1. Thereby, the sheet material 115 and the ribbon-shaped rubber 110 are formed in an endless shape in a more stable posture. Thereby, when the transmission belt 10 is used, each part of the core body 13 and the rubber layers 11, 12, 14, 15 can receive the tension more evenly. Therefore, the dispersion | variation in the performance of the transmission belt 10 can be suppressed more reliably.

  Further, according to the present embodiment, in the manufacture of the transmission belt 10, the extension side adhesive belt sleeve 102, the core body 13, and the compression side belt sleeve 105 are formed in this order. According to this configuration, since the compression side belt sleeve 105 is formed after the core body 13 is formed, the shape of the compression side belt sleeve 105 needs to be a shape that does not adversely affect the arrangement of the sheet material 115. Absent. For this reason, the freedom degree of the lamination | stacking method of the sheet | seat material 115 can be made higher.

  Further, according to the present embodiment, the sheet material 115 can be held by the sheet material bobbin 3 in a state before the sheet material 115 is wound around the mantle 5. Accordingly, the sheet material 115 is wound around the mantle 5 by providing a sheet winding mechanism having a simple configuration including the sheet material bobbin 3 and a tension mechanism after being fed out from the sheet material bobbin 3. Is possible. This eliminates the need for a complicated tension device that is required in the conventional configuration, that is, a configuration in which the core wire is wound around the belt sleeve.

  For example, in the case where an unvulcanized sleeve is formed using a core wire instead of the sheet material 115, a core wire joint (the number of twisted fibers constituting the core wire) in the middle of forming the core wire used for forming the unvulcanized sleeve Therefore, it is necessary to provide a joint with a shifted position. On the other hand, according to this embodiment, since the sheet material 115 is used instead of the core wire, there is no need for the above-mentioned joint, and as a result, the productivity of the transmission belt 10 can be further improved.

  For example, when an unvulcanized sleeve is formed using a core wire instead of the sheet material 115 and the unvulcanized sleeve is cut with a cutter, the processing conditions at the time of forming the core wire and the specifications of the cutter blade (round blade) Depending on whether or not, the core wire may not be cut sharply on the cut surface of the unvulcanized sleeve. In this case, the core wire becomes staggered at the end face of the transmission belt, and as a result, the tensile strength of the transmission belt is reduced. However, according to the present embodiment, when the unvulcanized sleeve 106 is cut along the width direction W1 in the cutting step (step S8), the sheet material 115 has a sufficient length in the width direction W1. Thereby, it is possible to suppress the sheet material 115 from being fluffed (caught) by the cutter 4. As a result, a decrease in tensile strength of the transmission belt 10 can be more reliably suppressed.

  Moreover, according to this embodiment, since a core wire is not used for formation of the transmission belt 10, the installation for carrying out the adhesion process of a core wire to an unvulcanized sleeve is unnecessary. As a result, the sheet material 115 can be bonded to the adhesive belt sleeves 102 and 104 with existing canvas processing equipment, and the unvulcanized sleeve 106 can be cut to a specified width after the bonding process.

  Moreover, according to this embodiment, since a core wire is not used for formation of the transmission belt 10, the operation | work which moves the heavy bobbin wound with a core wire or sets a core wire to a tension apparatus is unnecessary. Therefore, the heavy work by the worker can be reduced.

  In addition, according to the present embodiment, since the core wire is not used for forming the transmission belt 10, the core provided in the unvulcanized sleeve at the locations not used for the transmission belt (spinning start location and end location). A line becomes unnecessary. Thereby, in a cutting process, the quantity which discards the part of unnecessary waste can be reduced more. Thereby, the yield of the material of the transmission belt 10 can be made higher.

  In addition, when a core wire is used to form a transmission belt, separating the core wire and the rubber sleeve from the belt sleeve of the unvulcanized belt that has become cut waste is caused by an adhesive attached to the core wire. Have difficulty. Specifically, there are a plurality of core wires to be separated. And since a core wire will be disperse | distributed when isolate | separating a core wire and fine core wire waste remains in a belt sleeve, a long time will be required for the operation | work which isolate | separates all the core wire waste. However, if the sheet material 115 is used to form the transmission belt 10, the sheet material 115 is bonded to the adhesive belt sleeve 102, when separating the sheet material 115 from a part of the unvulcanized sleeve 106 that has become cut waste. The operation of peeling from 104 is performed. With such an operation, the sheet material 115 is more evenly peeled without being separated. Therefore, no waste remains like the core wire, and the work of peeling the sheet material 115 becomes easier.

  Further, in the transmission belt 10 according to the present embodiment, a sheet material 115 having a width set larger than the thickness is used as the reinforcing member. In the transmission belt 10, the width direction of the sheet material 115 is along the width direction W1 of the transmission belt 10, and the thickness direction of the sheet material 115 is along the thickness direction (radial direction R1) of the transmission belt 10. . Thereby, the core 13 as a reinforcing member can be extended over a wide range in the width direction W of the transmission belt 10. In this case, the reinforcing member does not become disconnected in the width direction of the transmission belt as compared with the conventional case where the core wire is used as the reinforcing member of the transmission belt. Therefore, the tension that can be practically applied to the transmission belt 10. Can be higher. Furthermore, since the region where the core body 13 exists in the width direction W of the transmission belt 10 is wide, it is more reliable that the core body 13 appears intermittently in the circumferential direction of the transmission belt 10 on both side surfaces of the transmission belt 10 in the width direction. Can be prevented. Therefore, it is possible to suppress the occurrence of individual differences in the tension that can be received by the core body 13 on the side surface of the transmission belt 10. Thereby, the dispersion | variation in the performance of the transmission belt 10 can be decreased more. Furthermore, since the sheet material 115 has a wide shape, the number of times of winding around the belt sleeve when forming the transmission belt 10 can be reduced as compared with the case of winding the core wire. Therefore, since the time required for forming the core body 13 can be reduced, the time required for manufacturing the transmission belt 10 can be further reduced.

  Further, in the transmission belt 10, the sheet materials 115 adjacent in the width direction W <b> 1 of the transmission belt 10 are arranged in a line along the width direction W <b> 1 of the transmission belt 10. In other words, one of the adjacent sheet materials 115 is not in a state of riding on the other. Thereby, the core 13 is arranged more evenly along the width direction W <b> 1 of the transmission belt 10. Therefore, when tension is applied to the transmission belt 10, this tension can be more evenly received by the core body 13 in the width direction W <b> 1 of the transmission belt 10. Thereby, the bias | inclination of the tension | tensile_strength received in the transmission belt 10 can be suppressed. As a result, when power is transmitted by wrapping a plurality of transmission belts 10 on a pulley or the like (during multi-running travel), there is a difference in tension between the plurality of transmission belts 10 and elongation due to the tension. Can be suppressed. Thereby, it can suppress that the transmission belt which reaches | attains a lifetime early because tension | tensile_strength acts excessively arises. Moreover, it is possible to suppress the occurrence of a transmission belt that reaches an early life due to wear due to slip as a result of a tension drop caused by a large elongation.

  The embodiment of the present invention has been described above. However, the present invention is not limited to the above-described embodiments, and various modifications can be made as long as they are described in the claims. For example, you may change as follows.

  (1) For example, in the above-described embodiment, the sheet material 115 forming the core body 13 is 1 ply. However, this need not be the case. For example, as shown in FIG. 11, the core body 13 </ b> A may be formed by providing a plurality of layers of the sheet material 115. In the following, differences from the above-described embodiment will be mainly described, and the same components as those in the above-described embodiment will be denoted by the same reference numerals and detailed description thereof will be omitted.

  In this modification, the core body 13A is formed by stacking the sheet material 115 in three layers. That is, in the core body forming step (step S5), the core body 13A is formed by laminating the sheet material 115 in the radial direction R1. In the core body 13A, the sheet material 115 adjacent in the radial direction R1 preferably has the winding directions in the width direction W1 opposite to each other. That is, when the first sheet material 115 on the mantle 5 side is wound around the mantle 5 while moving the position before being wound around the mantle 5 toward the one side in the axial direction X1 with respect to the mantle 5, two layers. It is preferable that the sheet material 115 of the eye is wound around the mantle 5 while moving the position before being wound around the mantle 5 toward the other side of the axial direction X1 with respect to the mantle 5. Further, it is preferable that the third layer sheet material 115 is wound around the mantle 5 while moving the position before being wound around the mantle 5 toward one side of the axial direction X1 with respect to the mantle 5.

  In this modified example, in the core body forming step (step S5), in any layer of the core body 13A, the adjacent sheet materials 115 in the direction parallel to the axial direction X1 overlap each other in the radial direction R1 of the mantle 5. The sheet material 115 is configured to be wound around the mantle 5 so as to avoid it. Thereby, the core body 13A is formed.

  Further, in this modification, the butting position B115 between the edge edges 115a of the portion adjacent to the width direction W1 in the sheet material 115 is shifted in the width direction W1 between the sheet materials 115 adjacent to the radial direction R1. . Specifically, the position B1151 of the edge 115a in the sheet material 115 of the first layer, that is, the sheet material 115 in contact with the extension-side adhesive belt sleeve 102, and the position B1152 of the edge 115a in the sheet material 115 of the second layer Is shifted by less than the width W115 of the sheet material 115 (for example, a fraction of the width W115). Similarly, the position B1153 of the edge 115a in the third-layer sheet material 115, that is, the sheet material 115 in contact with the compression-side adhesive belt sleeve 104, and the position B1152 of the edge 115a in the second-layer sheet material 115 are: The sheet material 115 is shifted by less than the width W115 (for example, a fraction of the width W115).

  Further, the position B1151 of the edge 115a in the first sheet material 115 and the position B102 of the edge 102a of the ribbon-like rubber 110 in the extension-side adhesive belt sleeve 102 are less than the width W115 of the sheet material 115 (for example, the width It is shifted by a fraction of W115. Similarly, the position B1153 of the edge 115a in the third-layer sheet material 115 and the position B104 of the edge 104a of the ribbon-like rubber 110 in the compression-side adhesive belt sleeve 104 are less than the width W115 of the sheet material 115 (for example, It is shifted by a fraction of the width W115.

  FIG. 12 is a cross-sectional view of a transmission belt 10A according to a modification. The transmission belt 10A of this modification is formed using the unvulcanized sleeve 106A in which the core body 13A is formed as described above. Specifically, the unvulcanized sleeve 106A is subjected to the same cutting step S8, skive step S9, cover winding step S10, and vulcanization treatment S11 (see FIG. 8) as in the above embodiment. A transmission belt 10A is formed.

  In the sheet material 115 constituting the core body 13A of the transmission belt 10A according to this modification, the width direction of the sheet material 115 is the width direction of the transmission belt 10A as in the case of the sheet material 115 of the transmission belt 10 according to the above embodiment. The portions of the sheet material 115 adjacent to the width direction W1 of the transmission belt 10A are in a state along the thickness direction of the transmission belt 10A along the thickness direction (radial direction R1) along W1. However, it does not overlap in the thickness direction (radial direction R1) of the transmission belt 10A.

  In the transmission belt 10A according to this modification, the sheet material 115 constituting the core 13A is overlaid in the thickness direction (radial direction R1) of the transmission belt. Further, in the transmission belt 10A, the butt positions B1151, B1152, and B1153 are shifted in the width direction W1 of the transmission belt 10A between the sheet materials 115 adjacent in the thickness direction (radial direction R1) of the transmission belt 10A. Yes.

  According to this modification, the core body 13A is formed by laminating the sheet material 115 in the radial direction R1. Thus, by laminating the sheet material 115, the core body 13A having a desired thickness can be easily formed. Thereby, it is not necessary to prepare in advance a plurality of types of sheet materials 115 having different thicknesses depending on the type of the transmission belt 10 (difference in size, tensile strength, etc. of the transmission belt 10). As a result, preparation, labor and time for manufacturing the transmission belt 10 can be reduced. In addition, since it is not necessary to prepare a plurality of types of sheet materials 115, the space for the material storage in the manufacturing factory of the transmission belt 10 can be used more widely. Further, since the work of replacing different types of sheet material 115 is not required, it is not necessary for an operator to frequently move a heavy bobbin around which the sheet material 115 is wound, and the heavy work can be reduced.

  In particular, the transmission belt 10 having desired physical properties can be formed by selecting the material of the sheet material 115, the thickness, the tensile strength, and the number of windings (number of layers) of the sheet material 115 around the stretch-side adhesive belt sleeve 102. it can. Thereby, it is not necessary to prepare in advance a plurality of types of sheet materials 115 having different thicknesses depending on the type of the transmission belt 10 (difference in size, tensile strength, etc. of the transmission belt 10).

  Further, according to this modification, the butting positions B1151, B1152, and B1153 are shifted in the width direction W1 between the sheet materials 115 adjacent in the radial direction R1. According to this configuration, the sheet material 115 is wound around the extension-side adhesive belt sleeve 102 in a more stable posture. Thereby, when the transmission belt 10 is used, each part of the core body 13A can receive the tension more evenly. Therefore, the dispersion | variation in the performance of the transmission belt 10 can be suppressed more reliably.

  Further, according to the transmission belt 10A according to this modification, the core body 13A having a desired thickness can be easily formed by stacking the sheet materials 115. Thereby, it is not necessary to prepare in advance a plurality of types of sheet materials having different thicknesses according to the type of the transmission belt (difference in the size of the transmission belt, the tensile strength, etc.). Thereby, preparation, labor, and time for manufacturing the transmission belt 10A can be reduced. Further, since it is not necessary to prepare a plurality of types of sheet materials, the space for the material storage in the transmission belt manufacturing factory can be used more widely. Further, since the work of replacing different types of sheet materials is not required, it is not necessary for the worker to frequently move a heavy bobbin around which the sheet materials are wound, and the heavy work can be reduced.

  Further, in the transmission belt 10A, the abutting positions (specifically, the abutting position B1151, the abutting position B1152, the abutting position B1152, and the abutting position B1153) between the sheet materials adjacent in the thickness direction (radial direction R1) are in the width direction W1. It is in a state shifted to In this case, for example, the sheet material 115 is wound in a more stable posture as compared with a case where the butting positions are aligned in the width direction W1. Thereby, at the time of use of 10 A of transmission belts, each part of a core can receive a tension | tensile_strength more uniformly. Therefore, the dispersion | variation in the performance of 10 A of transmission belts can be suppressed more reliably.

  (2) Further, in the above-described embodiment and modification, the configuration in which the compression side belt sleeve 105 is formed after the extension side belt sleeve 101 is formed in the mantle 5 has been described as an example. However, this need not be the case. For example, after the compression side belt sleeve 105 is formed on the mantle 5, the extension side belt sleeve 101 may be formed.

  (3) The extension side belt sleeve 101 may be formed of a plurality of ply ribbon-like rubbers 110. In this case, the formation method of the extension side belt sleeve 101 is the same as the formation method of the compression side belt sleeve 105.

  (4) Moreover, in the above-mentioned embodiment and modification, each belt sleeve 101,102,104,105 was formed by winding the ribbon-shaped rubber | gum 110 around the mantle 5. FIG. However, this need not be the case. For example, at least one of the belt sleeves 101, 102, 104, and 105 may be formed of a single rubber sheet instead of the ribbon-like rubber 110.

  (5) Further, the pitch P 115 around which the sheet material 115 is wound around the extension-side adhesive belt sleeve 102 may be larger than the width W 115 of the sheet material 115.

  (6) The present invention can be applied not only to the wrapped V-belt but also to the manufacture of other transmission belts and other transmission belts. As an example, the present invention can be applied to a combined V-belt described in detail below.

Second Embodiment
FIG. 13 is a cross-sectional view of a combined V-belt 10B as a transmission belt according to the second embodiment. FIG. 14 is a view of a part of the combined V-belt 10B shown in FIG. 13 as viewed from the outside in the radial direction, and the first fibers 118a and the second fibers 118b included in the core body 13B are schematically thin solid lines. It is a figure shown by. In FIG. 13, the first fiber 118a and the second fiber 118b are schematically illustrated by thin lines, but the first fiber 118a and the second fiber are actually shown even when the coupled V-belt 10B is viewed from the outside in the radial direction. 118b cannot be visually recognized.

  The combined V-belt 10B according to the second embodiment is formed by combining a plurality of endless belt portions 20 formed so as to have a V-shaped cross section (more specifically, a trapezoidal shape). . Although details will be described in order, the core body 13B is formed of the sheet material 115B even in the combined V-belt 10B according to the second embodiment.

  With reference to FIG. 13, the combined V-belt 10 </ b> B includes three belt portions 20 and a tie band 25 (connecting portion). In FIG. 13, the combined V-belt 10 </ b> B having the three belt portions 20 is taken as an example. You can also.

  Each belt portion 20 includes a compression rubber layer 15, a compression-side adhesive rubber layer 14, a core body 13B, and an outer cover cloth 16a.

  The compression rubber layer 15 is a long rubber layer having the same length as the combined V-belt 10B, and a cross-sectional shape perpendicular to the longitudinal direction is formed in a substantially trapezoidal shape as shown in FIG. Examples of the material of the compressed rubber layer 15 include natural rubber (NR) and styrene butadiene rubber (SBR).

  The compression-side adhesive rubber layer 14 is provided to connect the compression rubber layer 15 and the core body 13 </ b> B as in the case of the above embodiment, and is disposed on the outer peripheral side of the compression rubber layer 15. The compression-side adhesive rubber layer 14 has a substantially trapezoidal cross-sectional shape perpendicular to the longitudinal direction. Examples of the material for the compression-side adhesive rubber layer 14 include the same materials as the material for the compression rubber layer 15.

  The core body 13 </ b> B is provided as a portion that mainly receives tension acting on the transmission belt 10 in the transmission belt 10, as in the case of the above embodiment. Examples of the material of the core 13B include polyester fiber, glass fiber, carbon fiber, and aramid fiber. The core body 13 </ b> B is disposed in an intermediate portion in the radial direction (thickness direction) of the transmission belt 10, and is disposed over the entire region in the width direction of the transmission belt 10 in the intermediate portion.

  As the sheet material 115B used for the core body 13B of the combined V-belt 10B according to the second embodiment, a bi-directional sheet material 117 as shown in FIG. 9B is preferable. The bi-directional sheet material 117 includes first fibers 118a extending in a predetermined direction and second fibers 118b extending along a direction orthogonal to the first fibers 118a. In the sheet material 115B, the extending directions of the first fibers 118a and the second fibers 118b extend along the direction intersecting the longitudinal direction of the sheet material 115B. As will be described in detail later by forming the combined V-belt 10B using such a sheet material 115B, the extending directions of the first fibers 118a and the second fibers 118b included in the sheet material 115B are as shown in FIG. In addition, the direction intersects the circumferential direction of the combined V-belt 10B.

Examples of the first fiber 118a and the second fiber 118b included in the above-described bi-directional sheet material 117 include an aramid fiber as an example. For example, when the above-described sheet material 115B is formed using the bi-directional sheet material 117 using an aramid fiber and the thickness T115 is set to 0.031 mm to 0.24 mm, the tensile strength is 2060 (N / mm ² ) It can be set to about or more.

Moreover, as a 1st fiber 118a and a 2nd fiber 118b contained in the bidirectional sheet | seat material 117 mentioned above, carbon fiber can be mentioned as an example, for example. For example, when the above-described sheet material 115B is formed using the bi-directional sheet material 117 using carbon fiber and the thickness T115 is set to 0.0566 mm to 0.0833 mm, the tensile strength is 2900 (N / mm ² ) It can be set above.

  The outer covering cloth 16a excludes the compression rubber layer 15, the compression-side adhesive rubber layer 14, and the radially outer portion of the core body 13B (the portion of the core body 13B facing outward in the radial direction). It is provided as a canvas covering the part.

  The tie band 25 is provided as a connecting portion that connects a plurality of (three in the example shown in FIG. 13) belt portions 20. The tie band 25 has the same length as the combined V-belt 10B, and has an endless shape having a width dimension corresponding to the total dimension in the width direction W1 of the three belt portions 20 arranged at a slight interval in the width direction W1. Is formed. The tie band 25 is fixed by adhesion or the like in a state where the inner peripheral surface is in close contact with the core body 13B of each belt portion 20.

  FIGS. 15-21 is a schematic diagram for demonstrating the manufacturing method of the joint V belt 10B which concerns on 2nd Embodiment. FIG. 22 is a flowchart for explaining an example of the forming process of the combined V-belt 10B.

  Specifically, FIG. 15A and FIG. 15B are a perspective view and a cross-sectional view showing a winding step (step S12) of the compression side belt sleeve 105 using the molding apparatus 1, respectively. FIG. 16A and FIG. 16B are a perspective view and a cross-sectional view showing a winding step (step S13) of the compression-side adhesive belt sleeve 104 using the molding apparatus 1, respectively. FIG. 17A and FIG. 17B are a perspective view and a cross-sectional view, respectively, showing the winding process (step S14) of the core body 13B using the molding apparatus 1. FIG. 18 is a cross-sectional view showing the bias cutting step (step S15) of the unvulcanized sleeve 106B. FIG. 19A is a cross-sectional view showing the outer cloth winding step (step S16) of the unvulcanized belt 100B. FIG. 19B is a cross-sectional view showing a step (step S17) of setting each unvulcanized belt 100B around which the jacket cloth is wound in the groove 6a of the lower vulcanization mold 6. FIG. 20 is a cross-sectional view showing a step of setting the tie band 25 (step S18) and a vulcanization step (step S19) of each unvulcanized belt 100B in a state where the tie band 25 is set. FIG. 21 is a cross-sectional view illustrating a step (step S20) of cutting the vulcanized sleeve 107 by a predetermined width.

  In the manufacturing method of the combined V-belt 10B described below, the ribbon-shaped rubber 110 that serves as the basis of the compressed rubber layer 15 and the compression-side adhesion are formed on the outer peripheral surface of the mantle 5 of the molding apparatus 1 having the same configuration as in the above embodiment. By forming the ribbon-like rubber 110 serving as the basis of the rubber layer 14 and the sheet material 115B serving as the basis of the core body 13B (Steps S12 to S14 in FIGS. 15 to 17 and FIG. 22), unvulcanized. A sleeve 106B is formed. Thereafter, the cross-sectional shape of the unvulcanized sleeve 106B is formed into a predetermined trapezoidal shape by the bias cut process (step S15), thereby forming the unvulcanized belt 100B (FIG. 18). Each unvulcanized belt 100B is fitted into the groove portion 6a of the lower vulcanization mold 6 (FIG. 19A, step S16) in a state where a portion excluding the outer peripheral surface thereof is covered with the covering cloth 16a (FIG. 19A). 19 (B), step S17). Thereafter, the tie band 25 is set on the outer peripheral surface of each unvulcanized belt 100B (step S18), and is sandwiched between the lower vulcanization mold 6 and the upper vulcanization mold 7 and vulcanized (FIG. 20, step S19). The combined V-belt 10B can be formed by cutting the vulcanized sleeve 107 formed in this way at predetermined widths (FIG. 21, step S20).

  Below, with reference to FIGS. 15-22, the manufacturing method of the joint V belt 10B is demonstrated in detail. In addition, since step S1 and step S2 in FIG. 22 are the same as those in the above embodiment, the description thereof is omitted.

  The compression-side belt sleeve winding step (step S12) and the compression-side adhesive belt sleeve winding step (step S13) are respectively performed as “a belt that forms an unvulcanized belt sleeve having a predetermined thickness on the outer periphery of the mantle. It is an example of a “sleeve forming step”. Among these, the compression-side adhesive belt sleeve winding step (step S13) is an example of “a belt sleeve forming step for forming a belt sleeve configured to come into contact with the core”.

  Referring to FIGS. 15A and 15B, in the compression side belt sleeve winding step (step S <b> 12), an operator fixes one end of ribbon-like rubber 110 to mantle 5. From this state, as in the case of the above-described embodiment, the mantle 5 rotates and the ribbon-shaped rubber 110 is displaced along the axial direction X1, whereby the ribbon-shaped rubber 110 is wound spirally.

  In the second embodiment, the compression-side belt sleeve 105 having a relatively large thickness is formed by winding a plurality of layers of ribbon-like rubber 110 around the mantle 5. In this case, the ribbon-like rubber 110 is laminated in the radial direction R1 of the mantle 5 to form the compression side belt sleeve 105. Further, the ribbon-shaped rubber 110 is wound around the mantle 5 so as to prevent the ribbon-shaped rubbers 110 adjacent in the direction parallel to the axial direction X1 from overlapping each other in the radial direction R1 of the mantle 5. The pitch P110 around which the ribbon rubber 110 is wound is set to be the same as the width W110 of the ribbon rubber 110.

  Through the above steps, a compression side belt sleeve 105 formed of a plurality of layers of ribbon-like rubber 110 is completed on the outer periphery of the mantle 5. After the compression side belt sleeve 105 is completed, the ribbon rubber 110 at a position before being wound around the mantle 5 is cut by a cutter (not shown).

  Referring to FIGS. 16A and 16B, in the compression side adhesive belt sleeve winding step (step S <b> 13), as in the operation in step S <b> 12, the worker can connect one end of ribbon-like rubber 110. Is fixed to the mantle 5. From this state, the ribbon-shaped rubber 110 is spirally wound by the same operation as the operation in step S12.

  In the second embodiment, the compression-side adhesive belt sleeve 104 having a relatively small thickness is formed by winding the ribbon-like rubber 110 around the mantle 5 by one layer (ply). In this case, the ribbon-shaped rubber 110 is wound around the mantle 5 so as to avoid the ribbon-shaped rubbers 110 adjacent in the direction parallel to the axial direction X1 from overlapping each other in the radial direction R1. In this case, the width W110 of the ribbon-shaped rubber 110 is set to be the same as the pitch P110 around which the ribbon-shaped rubber 110 is wound in the mantle 5. As a result, the ribbon-shaped rubber 110 is wound around the mantle 5 in a state where the ribbon-shaped rubbers 110 adjacent to each other in the direction parallel to the axial direction X1 are in close contact with each other.

  Through the above steps, the compression-side adhesive belt sleeve 104 formed of a single layer of ribbon-like rubber 110 is completed on the outer periphery of the mantle 5 and the compression-side belt sleeve 105. After the compression-side adhesive belt sleeve 104 is completed, the ribbon-like rubber 110 is cut with a cutter (not shown).

  Referring to FIGS. 17A and 17B, in the core body forming step (step S14), sheet material 115B is wound spirally. Specifically, the sheet material 115B is formed in an elongated ribbon shape, and the width W115 of the sheet material 115B is set larger than the thickness T115 of the sheet material 115B. The sheet material 115B is formed in a ribbon shape. In the core forming step (step S <b> 14), first, an operator fixes one end of the sheet material 115 </ b> B to the mantle 5. From this state, the rotation of the mantle 5 causes the sheet material 115 </ b> B to be drawn to the mantle 5 and wound around the mantle 5. Further, the sheet material 115B is wound spirally by displacing the position where the sheet material 115B is wound around the mantle 5 along the axial direction X1. By forming the core body 13B in this way, an unvulcanized sleeve 106B formed in a wide cylindrical shape is formed.

  In the second embodiment, the core 13B having a relatively small thickness is formed by winding the sheet material 115B around the mantle 5 by one layer (ply). In this case, the mantle 5 is configured so that the sheet materials 115B adjacent to each other in the direction parallel to the axial direction X1 of the mantle 5 (the portions adjacent to the width direction W1 in the sheet material 115B) do not overlap each other in the radial direction R1. 5. It is wound around the compression side belt sleeve 105 and the compression side adhesive belt sleeve 104. In this case, the pitch P115 around which the sheet material 115B is wound is set to be the same as the width W115 of the sheet material 115B. Accordingly, the sheet material 115B is wound around the mantle 5 in a state where the sheet materials 115B adjacent in the direction parallel to the axial direction X1 are in close contact with each other.

  In the combined V-belt 10B according to the second embodiment, as in the above-described embodiment, the edges 104a of portions adjacent to each other in the width direction W1 of the ribbon-like rubber 110 in the compression-side adhesive belt sleeve 104 are predetermined. It is abutted at a butting position B104. The butting position B104 extends in a spiral shape on the outer peripheral side of the mantle 5. Similarly, edges 115a of portions adjacent to each other in the width direction W1 of the sheet material 115B in the core body 13B are abutted at a predetermined abutting position B115. The butting position B115 extends in a spiral shape on the outer peripheral side of the mantle 5. As in the case of the above embodiment, the butting position B115 of the sheet material 115B and the butting position B104 of the ribbon-like rubber 110 in the extension-side adhesive belt sleeve 102 are shifted in the width direction W1.

  Referring to FIG. 18, in step S15, unvulcanized belt 100B is formed by performing bias cutting on unvulcanized sleeve 106B. Specifically, in step S15, a plurality of endless unvulcanized belts 100B having an isosceles trapezoidal cross section are formed by cutting each cutting line L in FIG. 18 with a cutter (not shown). . Note that the triangular scrap Wa having a triangular cross section generated by the process is discarded or reused.

  Referring to FIG. 19A, in step S16, a predetermined portion of each unvulcanized belt 100B is covered with a covering cloth 16a. Specifically, in step S16, a portion of the outer peripheral surface of each unvulcanized belt 100B excluding the radially outer surface is covered with the covering cloth 16a. In other words, the inner surface in the radial direction of each unvulcanized belt 100B and the both side surfaces in the width direction of each unvulcanized belt 100B are covered with the covering cloth 16a.

  Each unvulcanized belt 100B wound with the covering cloth 16a as described above is fitted into the annular groove 6a formed in the lower vulcanization mold 6 (FIG. 19B, step S17). The tie band 25 is set on the radially outer portion (step S17). In the set of tie bands 25, a plurality of layers of tie band rubber sheets (not shown) are wound along the circumferential direction on the radially outer surface of the plurality of unvulcanized belts 100B arranged in the width direction W1. . Thereby, the tie band 25 is set with respect to the some unvulcanized belt 100B. The tie band 25 and each unvulcanized belt 100B are coupled to each other by adhesion or the like. That is, in the step of setting the tie band to the unvulcanized belt 100B (step S18), an unvulcanized belt coupling step of coupling a plurality of unvulcanized belts 100B to each other via the tie band 25 as a connecting portion. Is included. In addition, although the example which comprises the tie band 25 by wrapping a plurality of layers of rubber sheets for tie bands has been described here, the present invention is not limited thereto. For example, the tie band 25 may be configured by winding a single layer or a plurality of layers of a canvas in which the rubber composition is rubbed. Alternatively, the tie band 25 may be configured by winding a canvas with rubber around a single layer or a plurality of layers.

  Referring to FIG. 20, in step S18, the tie band 25 and the plurality of unvulcanized belts 100B set as described above are sandwiched between the upper vulcanization mold 7 and the lower vulcanization mold 6. It is vulcanized while being pressurized. Thereby, the post-vulcanization sleeve 107 is formed. The vulcanized sleeve 107 formed in this way is cut to a predetermined width, whereby a combined V-belt 10B having a predetermined number of belt portions 20 as shown in FIG. 13 is formed.

  Referring to FIG. 13, each belt portion 20 of the combined V-belt 10B formed as described above has a compression rubber layer 15, a compression-side adhesive rubber layer 14, and a core similar to those in the above embodiment. 13B will be provided. Specifically, in the cross section of each belt portion 20, the cross section of the ribbon-like rubber 110 constituting each rubber layer 14, 15 is arranged in a line in the width direction W 1 for each rubber layer 14, 15. It becomes a shape. Similarly, in the cross section of the belt part 20, it becomes a shape where the cross section of the sheet | seat material 115B which comprises the core 13B is located in a line in the width direction W1.

  Referring to FIG. 13, in core 13B, the width direction of sheet material 115B is along width direction W1 of combined V-belt 10B, and the thickness direction of sheet material 115B is in the thickness direction (radial direction R1) of combined V-belt 10B. It is in a state along. Referring to FIG. 13, in the core body 13 </ b> B, portions adjacent to the width direction W <b> 1 in the sheet material 115 </ b> B are in a state of being butted in the width direction W <b> 1. In other words, in the core body 13B, the portions adjacent to the width direction W1 in the sheet material 115B do not overlap in the thickness direction (radial direction R1) of the combined V-belt 10B.

  Referring to FIG. 14, in the sheet material 115B (core body 13B) provided in the combined V-belt 10B, the first fibers 118a extend along the direction intersecting the circumferential direction of the combined V-belt 10B. And the second fibers 118b extend in a direction intersecting the first fibers 118a. More specifically, the first fiber 118a extends along a direction inclined by about 45 degrees with respect to the circumferential direction of the combined V-belt 10B, and the second fiber 118b extends in a direction orthogonal to the first fiber 118a. Extending along.

  As described above, in the second embodiment, as in the case of the first embodiment, a sheet material formed in a sheet shape as a reinforcing member of the transmission belt (in the case of this modification, the combined V-belt 10B). 115B is used. Thus, as in the case of the first embodiment, the tension that the transmission belt can practically receive can be increased, the variation in performance of the transmission belt can be reduced, and the time required for manufacturing can be reduced. A belt and a method for manufacturing such a transmission belt can be provided.

  In the second embodiment, the first fiber 118a included in the sheet material 115B extends in a direction intersecting the circumferential direction C1 of the combined V-belt 10B, and the second fiber 118b intersects the first fiber 118a. It extends along. Thereby, since the stretchability of the sheet material 115B is maintained, the service life of the combined V-belt 10B can be extended.

<Modification of Second Embodiment>
FIG. 23 is a flowchart for explaining an example of a forming process of a combined V-belt as a transmission belt according to a modification of the second embodiment. FIG. 24A is a cross-sectional view showing a step (step S21) of setting the outer covering cloth 16b to the lower vulcanization mold 6. FIG. 24B is a cross-sectional view showing a step (step S17) of setting each unvulcanized belt 100B to the lower vulcanization mold 6. In the manufacturing method of the combined V-belt according to the present modification, step S21 (covering cloth is set in the lower vulcanization mold instead of step S16 (step of winding the covering cloth around the unvulcanized belt 100B) in FIG. Process). In the following, points different from the modification described with reference to FIG. 22 will be mainly described, and description of other points will be omitted.

  In this modification, after the plurality of unvulcanized belts 100B are formed (that is, after the steps S1, S2, S12, S13, S14, and S15 are performed), as shown in FIG. In step S21, the covering cloth 16b is set on the lower vulcanization mold 6. Specifically, in step S21, the lower covering cloth 16b is formed so that the lower covering cloth 16b is in close contact with all of the plurality of grooves 6a formed in the lower vulcanizing mold 6. It is set in the mold 6 for sulfur. Thereafter, in step S17, each unvulcanized belt 100B is fitted into each groove 6a via the jacket cloth 16b. The subsequent steps are the same as the manufacturing method of the combined V-belt 10B described with reference to FIG.

  As described above, the combined V-belt manufactured by the manufacturing method of the combined V-belt according to the present modification is more adjacent to the adjacent belt portions 20 than the combined V-belt 10B manufactured by the manufacturing method shown in FIG. Except that the outer cover cloth 16b is provided (that is, the outer cover cloth 16b is provided over the entire width direction of the combined V-belt). . Therefore, also in this modified example, as in the modified example described with reference to FIG. 22, the tension that the transmission belt can practically receive can be increased, and variations in the performance of the transmission belt can be reduced, and It is possible to provide a transmission belt capable of reducing the time required for manufacturing, and a method for manufacturing such a transmission belt.

  In addition, in this modification, although the example which forms each belt sleeve 104,105 using the ribbon-shaped rubber | gum 110 was given and demonstrated, it is not restricted to this. Specifically, at least one of the belt sleeves 104 and 105 may be formed of a single rubber sheet.

<Third Embodiment>
Next, a third embodiment of the present invention will be described. The joint V belt 10C according to the third embodiment is different from the joint V belt 10B of the second embodiment described above in that a tie band 25 (reinforcing cloth) for connecting the belt portion 20 and a sheet-like belt A low-hardness rubber layer (extended rubber layer and extended-side adhesive rubber layer) including foamed rubber or the like is further disposed between the core body 13B and the core body 13B.

  Here, the reason why the inventor of the present application came up with the combined V-belt 10C of the third embodiment will be described. Conventionally, as described in Japanese Patent Application Laid-Open No. 10-257810, a harvester for crops is a combination of, for example, a screw conveyor that conveys heavy and lightweight objects from the lower part and a belt that sandwiches and conveys the conveyed substance at the upper part. It has the structure which was made. For example, two belts for nipping and conveying the conveyed product are used, and the conveyed item is nipped in cooperation. Such belts include V belts, flat belts, and conveyor belts. The belt to be nipped and conveyed has a structure in which the back surface of the belt has a shape suitable for the conveyed product so as not to damage the conveyed product, and an elastic body of sponge of hardness is attached. There may be. Some of the belts have a configuration imitating a pattern on the back of a flat belt or conveyor belt. These two sets of belts are wound and arranged in a state of facing each other, and are mounted on a transport mechanism of a harvesting machine.

  Among harvesting machines that harvest crops as transported items, large-scale harvesters with improved harvesting capacity have a longer transport belt, and when the amount transported by the belt at one time (the number of transported items such as carrots) increases The total weight of increases. For this reason, the belt is bent (hangs down) by the weight. When such drooping occurs, there arises a problem that leaves cannot be cut accurately in the next process of conveyance, or a harvest rate is lowered due to a fall of a conveyed product during conveyance.

  As countermeasures against such problems, it is conceivable that (1) a conveyed product is clamped by a belt having a large clamping width (for example, D, E type, etc.). Further, (2) it is conceivable that a large number of conveyed objects are sandwiched by a plurality of belts at once by applying a plurality of belts (providing a plurality of belt pairs). However, large belts such as the D-type and E-type (1) described above tend to bend because the driving load (load during belt driving) is large and the belt itself is heavy. In addition, since the diameter of the pulley around which the belt is wound becomes large, it is difficult to make the apparatus compact. In the case of the multiple hook (2) described above, as a result of speed differences and tension differences occurring between the plurality of belts over time, the function of accurately grasping and transporting the conveyed product is deteriorated. Based on the above findings, the inventor of the present application can, for example, reduce the size of the belt without bending (hanging down) even if the belt becomes long for the purpose of increasing the harvesting capacity. I came up with a transmission belt that can be gripped and transported without falling.

  FIG. 25 is a cross-sectional view of a combined V-belt 10C as a transmission belt according to the third embodiment.

  Referring to FIG. 25, the combined V-belt 10C according to the third embodiment has a plurality of endless belt portions 20C formed so that the cross-sectional shape is V-shaped (more specifically, trapezoidal), It is formed by bonding. Although described in detail in order, the core body 13C is formed by the sheet material 115C even in the combined V-belt 10C.

  The combined V-belt 10C includes three belt portions 20C and a tie band 25C (connecting portion) that connects the three belt portions 20C to each other. In FIG. 25, the combined V-belt 10C having three belt portions 20C is taken as an example, but the present invention is not limited to this, and the present invention is applied to a combined V-belt having two or four or more belt portions 20C. You can also.

  Each belt portion 20C is, for example, a wrapped V belt and may be a low edge V belt. Examples of each belt portion 20C (belt size) include A shape, B shape, C shape, thin A shape, thin B shape, and thin C shape. The thin A-type, thin B-type, and thin C-type are thinner than the corresponding A-type, B-type, and C-type belts, respectively. Each belt portion 20C includes a compression rubber layer 15C, a compression side adhesive rubber layer 14C, a core body 13C, an extension side adhesive rubber layer 12C, an extension rubber layer 11C, and an outer cover cloth 16aC.

  The compressed rubber layer 15C is a long rubber layer having the same length as the combined V-belt 10C, and a cross-sectional shape perpendicular to the longitudinal direction is formed in a substantially trapezoidal shape as shown in FIG. Examples of the material of the compressed rubber layer 25 include natural rubber (NR) and styrene butadiene rubber (SBR). The configuration of the compressed rubber layer 15C is the same as that of the compressed rubber layer 15B of the second embodiment.

  As in the case of the second embodiment, the compression-side adhesive rubber layer 14C is provided to connect the compression rubber layer 15C and the core body 13C, and is disposed on the outer peripheral side of the compression rubber layer 15C. The compression-side adhesive rubber layer 14C has a substantially trapezoidal cross-sectional shape perpendicular to the longitudinal direction. Examples of the material for the compression-side adhesive rubber layer 14C include the same materials as the material for the compression rubber layer 15C. The configuration of the compression-side adhesive rubber layer 14C is the same as that of the compression-side adhesive rubber layer 14B of the second embodiment.

  Similarly to the case of the second embodiment, the core body 13C is provided as a portion that mainly receives tension acting on the transmission belt 10C in the transmission belt 10C. Examples of the material of the core 13C include polyester fiber, glass fiber, carbon fiber, and aramid fiber. The core 13C is disposed in the intermediate portion in the radial direction (thickness direction) of the transmission belt 10C, and is disposed over the entire region in the width direction of the transmission belt 10C. The configuration of the core body 13C is the same as that of the core body 13B of the second embodiment.

  The stretch-side adhesive rubber layer 12C is provided to connect the stretch rubber layer 11C and the core body 13C, and is disposed on the outer peripheral side of the core body 13C. The stretch-side adhesive rubber layer 12C has a substantially trapezoidal cross-sectional shape perpendicular to the longitudinal direction. Examples of the material of the stretch-side adhesive rubber layer 12C include the same materials as the material of the compression rubber layer 15C. One extension-side adhesive rubber layer 12C is provided.

  The stretch rubber layer 11C is disposed between the core body 13C and the tie band 25C. The stretch rubber layer 11C is a portion that stretches when the combined V-belt 10C is bent. The stretched rubber layer 11 </ b> C is a portion that applies a gripping force (friction force) for gripping the transported object H when transporting the transported object H described later. The stretch rubber layer 11C is a long rubber layer having the same length as the combined V-belt 10C, and the cross-sectional shape perpendicular to the longitudinal direction is formed in a substantially trapezoidal shape as shown in FIG. The material of the stretch rubber layer 11C is selected from, for example, the same material as the compression rubber layer 15C, low-hardness rubber, and foamed rubber in consideration of compression resistance, resilience resistance, and the like. Examples of rubber hardness when the stretch rubber layer 11C is rubber include JIS (Japanese Industrial Standards) types A35 to A65. Moreover, ASKER C15-60 can be illustrated as hardness in case the expansion | extension rubber layer 11C is foamed rubber (sponge). Moreover, 2-10 (mm) can be illustrated as thickness dimension of 11 C of extending | stretching rubber layers.

  The outer covering cloth 16aC is composed of a compression rubber layer 15C, a compression side adhesive rubber layer 14C, a core 13C, an extension side adhesive rubber layer 12C, and a radially outer portion (extension rubber layer) of the extension rubber layer 11C. 11C is provided as a canvas covering a portion excluding a portion of 11C that is directed radially outward.

  The tie band 25C is provided as a connecting portion that connects a plurality of (three in the example shown in FIG. 25) belt portions 20C. The tie band 25C has the same length as the combined V-belt 10C, and has an endless shape having a width dimension corresponding to the total dimension in the width direction W1 of the three belt portions 20C arranged at a slight interval in the width direction W1. Is formed. The tie band 25C is fixed by adhesion or the like in a state where the inner peripheral surface is in close contact with the core body 13C of each belt portion 20C.

  As a sheet material forming the tie band 25C of the combined V-belt 10C according to the third embodiment, a bi-directional fiber sheet material 119 shown in FIG. The bi-directional fiber sheet material 119 of the tie band 25C includes first fibers 119a extending in a predetermined direction and second fibers 119b extending along a direction orthogonal to the first fibers 119a. These first fibers 119a and second fibers 119b are formed by being woven or knitted crossing in two different directions. In the bi-directional fiber sheet material 119 constituting the tie band 25C, the extending directions of the first fibers 119a and the second fibers 119b extend along the direction intersecting the longitudinal direction of the sheet material 119, respectively. Yes.

  The direction in which the first fibers 119a extend is the belt circumferential direction C1, and the direction in which the second fibers 119b extend is the belt width direction W1. Thus, the 1st fiber 119a and the 2nd fiber 119b are extended so that it may intersect perpendicularly.

  The direction in which the first fibers 119a and the second fibers 119b extend may be, for example, the direction shown in FIG. In this case, the direction in which the first fiber 119a extends and the direction in which the second fiber 119b extends is a bias (oblique direction, crossing direction) with respect to the belt circumferential direction C1, and is, for example, an angle of 45 degrees with respect to the belt circumferential direction C1. I am doing. Here, the direction in which the first fibers 119a extend and the direction in which the second fibers 119b extend may be symmetrical with respect to the belt width direction W1 (left-right symmetry in FIG. 26B). Such a symmetrical arrangement may be employed from the viewpoint of making the belt strength more uniform.

  FIG. 27 is a diagram schematically illustrating a state in which the pair of combined V-belts 10C conveys the conveyed product. Here, as shown in FIG. 27, a pair of coupling V belts 10C, such as carrots, are sandwiched between a pair of coupling V belts 10C arranged such that the axial direction is directed in the vertical direction. A configuration in which the conveyed product H is conveyed in the belt circumferential direction C1 by the rotational driving of the belt 10C can be considered. In such a configuration, as a configuration for more remarkably suppressing the slack (curvature due to sagging) of the combined V-belt 10C, the following properties can be given as the properties of the bi-directional sheet constituting the tie band 25C.

Specifically, an aramid fiber and a carbon fiber can be mentioned as a material of the bidirectional fiber sheet material 119 constituting the tie band 25C. The basis weight of the bi-directional fiber sheet material 119 is preferably 90 to 870 (g / m ² ) for aramid fibers and 200 to 300 (g / m ² ) for carbon fibers. When the weight per unit area is equal to or greater than the above lower limit, the strength of the bi-directional fiber sheet material 119 can be sufficiently ensured.

In addition, the tensile strength of the bi-directional fiber sheet material 119 is preferably 2060 (N / mm ² ) or more in the case of an aramid fiber and 2900 (N / mm ² ) or more in the case of a carbon fiber. When the tensile strength is equal to or more than the above lower limit, the tie band 25C can sufficiently withstand the weight of a large number of conveyed objects H in addition to its own weight.

  Moreover, it is preferable that the thickness of this bi-directional fiber sheet material 119 is 0.03-0.24 (mm) in the case of an aramid fiber, and 0.05-0.09 (mm) in the case of carbon fiber. When the thickness is equal to or greater than the above lower limit, the strength of the bi-directional fiber sheet material 119 can be sufficiently secured, and when the thickness is equal to or smaller than the upper limit, the tie band 25C does not become too heavy.

  In addition, the bi-directional fiber sheet material 119 is subjected to a treatment (adhesion treatment with a known RFL solution, rubber glue, impregnating resin, etc.) for enhancing the adhesion with the surrounding rubber layer 11C as the surrounding rubber. Also good. In addition, the surface of the tie band 25C may be provided with irregularities by warp and weft yarns for the purpose of preventing the conveyed object from slipping.

  The rubber as the material of each rubber layer 15C, 14C, 12C, 11C of the combined V-belt 10C can be selected from a rubber composition and foamed rubber.

  FIG. 28 to FIG. 32 are schematic diagrams for explaining a method of manufacturing the combined V-belt 10C according to the third embodiment. FIG. 33 is a flowchart for explaining an example of the forming process of the combined V-belt 10C. Hereinafter, an example of a forming process of the combined V-belt 10C using the forming apparatus 1 will be described.

  Specifically, FIG. 28A is a cross-sectional view showing the step of winding the compression side belt sleeve 105C (step S22). FIG. 28B is a cross-sectional view showing the step of winding the compression side adhesive belt sleeve 104C (step S23). FIG. 28C is a cross-sectional view showing the winding process (step S24) of the core body 13C. FIG. 29A is a cross-sectional view showing the winding step (step S25) of the extension-side adhesive belt sleeve 102C. FIG. 29B is a cross-sectional view showing the winding step (step S26) of the extension side belt sleeve 101C.

  FIG. 30 is a cross-sectional view showing the bias cutting step (step S27) of the unvulcanized sleeve 106C. FIG. 31A is a cross-sectional view showing an outer cloth winding step (step S28) of the unvulcanized belt 100C. FIG. 31B is a cross-sectional view showing a step (step S29) of setting each unvulcanized belt 100C around which the covering cloth 16aC is wound in the groove portion 6a of the lower vulcanizing mold 6. FIG. 32A is a cross-sectional view showing a step of setting the tie band 25C (step S30) and a vulcanization step (step S29) of each unvulcanized belt 100C in a state where the tie band 25C is set. FIG. 32B is a cross-sectional view showing a step (step S32) of cutting the vulcanized sleeve 107C by a predetermined width.

  In the manufacturing method of the combined V-belt 10C described below, the ribbon-shaped rubber 110 that is the basis of the compressed rubber layer 15C, the compression side on the outer peripheral surface of the mantle 5 of the molding apparatus 1 having the same configuration as in the second embodiment. Ribbon-like rubber 110 that is the base of the adhesive rubber layer 14C, the sheet material 115C that is the base of the core 13B, the ribbon-like rubber 110 that is the base of the extension-side adhesive rubber layer 12C, and the ribbon that is the base of the extension rubber layer 11C When the rubber 110 is formed in order (steps S22 to S26 in FIGS. 28A to 29B), the unvulcanized sleeve 106C is formed. Thereafter, the cross-sectional shape of the unvulcanized sleeve 106C is formed into a predetermined trapezoidal shape by the bias cut process (step S27), thereby forming the unvulcanized belt 100C (FIG. 30).

  Each unvulcanized belt 100C is fitted into the groove portion 6a of the lower vulcanization mold 6 in a state where the portion excluding the outer peripheral surface is covered with the covering cloth 16aC (FIG. 31 (A), step S28). 31 (B), step S29). Thereafter, the tie band 25C is set on the outer peripheral surface of each unvulcanized belt 100C (FIG. 32A, step S30), and is sandwiched between the lower vulcanization mold 6 and the upper vulcanization mold 7. It is vulcanized (FIG. 32A, step S31). The combined V-belt 10C can be formed by cutting the vulcanized sleeve 107C formed in this way at predetermined widths (FIG. 32B, step S32).

  Below, the manufacturing method of the joint V belt 10C is demonstrated in detail. Note that step S1 and step S2 in FIG. 33 are the same as those in the first embodiment, and a description thereof will be omitted.

  The compression side belt sleeve winding step (step S22), the compression side adhesive belt sleeve winding step (step S23), the extension side adhesive belt sleeve winding step (step S25) and the extension side sleeve winding step (step S26) are: Each is an example of “a belt sleeve forming step of forming an unvulcanized belt sleeve having a predetermined thickness on the outer periphery of the mantle”. Among them, in particular, the compression side adhesive belt sleeve winding step (step S23) and the extension side adhesive belt sleeve winding step (step S25) are "belt sleeves forming a belt sleeve configured to come into contact with the core body". It is an example of “formation step”.

  Referring to FIG. 28A, in the compression side belt sleeve winding step (step S <b> 22), an operator fixes one end portion of ribbon-like rubber 110 to mantle 5. From this state, as in the case of the second embodiment, the mantle 5 rotates and the ribbon rubber 110 is displaced along the axial direction X1, whereby the ribbon rubber 110 is wound spirally.

  In the third embodiment, similarly to the second embodiment, the compression-side belt sleeve 105C having a relatively large thickness is formed by winding a plurality of layers of ribbon-like rubber 110 around the mantle 5. Since the process at the time of forming the compression side belt sleeve 105C is the same as step S12 of the second embodiment, detailed description thereof is omitted. After the compression side belt sleeve 105C is completed, the ribbon rubber 110 at a position before being wound around the mantle 5 is cut by a cutter (not shown).

  Referring to FIG. 28 (B), in the compression-side adhesive belt sleeve winding step (step S23), the worker fixes one end of the ribbon-like rubber 110 to the mantle 5 in the same manner as the operation in step S22. . From this state, the ribbon-like rubber 110 is spirally wound in one layer (ply) by the same operation as that in step S23. Since this operation is the same as step S13 of the second embodiment, a detailed description thereof is omitted. Through the above steps, the compression-side adhesive belt sleeve 104 </ b> C formed of a single layer of ribbon-like rubber 110 is completed on the outer periphery of the mantle 5 and the compression-side belt sleeve 105 </ b> C. After the compression-side adhesive belt sleeve 104C is completed, the ribbon rubber 110 is cut with a cutter (not shown).

  Referring to FIG. 28C, in the core forming step (step S24), the sheet material 115C is wound spirally. Since the winding operation of the sheet material 115C in this core step is the same as the operation in step S14 in the second embodiment, detailed description thereof is omitted. The core member 13C having a relatively small thickness is formed by winding the sheet material 115C in a spiral manner.

  Referring to FIG. 29A, in the extension side adhesive belt sleeve winding step (step S25), the worker fixes one end of the ribbon-like rubber 110 to the mantle 5 in the same manner as the operation in step S23. . From this state, the ribbon-like rubber 110 is spirally wound around one layer by the same operation as that in step S23.

  Referring to FIG. 29B, in the extension side belt sleeve winding step (step S26), an operator fixes one end of the ribbon-like rubber 110 to the mantle 5. From this state, as in step S25, the mantle 5 rotates and the ribbon rubber 110 is displaced along the axial direction X1, whereby the ribbon rubber 110 is spirally wound. In the extension side belt sleeve winding step, the ribbon-like rubber 110 is wound by one layer. In the extension side belt sleeve winding step, the ribbon-like rubber 110 may be wound in a plurality of layers. By the above operation, the extension side belt sleeve 101C is formed. After the extension side belt sleeve 101C is completed, the ribbon-like rubber 110 at a position before being wound around the mantle 5 is cut by a cutter (not shown). By forming the extension side belt sleeve 101C in this manner, an unvulcanized sleeve 106C formed in a wide cylindrical shape is formed.

  Referring to FIG. 30, in step S27, the unvulcanized belt 100C is formed by performing bias cutting on the unvulcanized sleeve 106C. Specifically, in step S27, an endless unvulcanized belt having an isosceles trapezoidal cross section is obtained by cutting each cutting line L along the circumferential direction of the unvulcanized sleeve 106C with a cutter (not shown). A plurality of 100Cs are formed. This step is performed in accordance with the present invention according to the present invention by “cutting the belt sleeve formed with the compression side belt sleeve, the extension side belt sleeve and the core body along the circumferential direction of the belt sleeve to form a plurality of unvulcanized belts. It is an example of a “sulfur belt forming step”. Note that the triangular scrap WaC having a triangular cross-section generated by this process is discarded or reused.

  Referring to FIG. 31A, in step S28, a predetermined portion of each unvulcanized belt 100C is covered with the covering cloth 16aC. Specifically, in step S28, a portion of the outer peripheral surface of each unvulcanized belt 100C excluding the radially outer surface is covered with the covering cloth 16aC. In other words, the inner surface in the radial direction of each unvulcanized belt 100C and the both side surfaces in the width direction of each unvulcanized belt 100C are covered with the jacket cloth 16aC.

  Each unvulcanized belt 100C around which the covering cloth 16aC is wound as described above is fitted into an annular groove 6a formed in the lower vulcanization mold 6 (FIG. 31 (B), step S29). A tie band 25C is set on the radially outer stretched rubber layer 11C (stretch side belt sleeve 101C) (FIG. 32A, step S30). In the set of tie bands 25C, one or more layers of rubber sheets for tie bands (not shown) are wound along the circumferential direction on the radially outer surface of the plurality of unvulcanized belts 100C arranged in the width direction W1. It is hung. Thereby, the tie band 25C is set to the plurality of unvulcanized belts 100C. The tie band 25C and the stretched rubber layer 11C of each unvulcanized belt 100C are bonded to each other by adhesion or the like. That is, in the step of setting the tie band to the unvulcanized belt 100C (step S30), an unvulcanized belt coupling step of coupling a plurality of unvulcanized belts 100C to each other via the tie band 25C as a connecting portion. Is included. Here, the example in which the tie band 25C is configured by winding a plurality of layers of the tie band rubber sheet has been described, but the present invention is not limited thereto. For example, the tie band 25C may be configured by winding a single layer or a plurality of layers of a canvas in which the rubber composition is rubbed. Alternatively, the tie band 25C may be configured by winding a canvas with rubber around a single layer or a plurality of layers.

  Referring to FIG. 32A, in step S31, the tie band 25C and the plurality of unvulcanized belts 100C set as described above are connected to the upper vulcanization mold 7 and the lower vulcanization mold 6. It is vulcanized while being pressed between them. Thereby, the vulcanized sleeve 107C is formed. The vulcanized sleeve 107C thus formed is cut to a predetermined width (FIG. 32B, step S32). As a result, a combined V-belt 10C having a predetermined number of belt portions 20C as shown in FIG. 25 is formed.

  Each belt portion 20C of the combined V-belt 10C formed as described above has a compression rubber layer 15C, a compression-side adhesive rubber layer 14C, and a core similar to those in the second embodiment with reference to FIG. In addition to 13C, an extension-side adhesive rubber layer 12C and an extension rubber layer 11C are provided.

  In the core 13C, the width direction of the sheet material 115C is along the width direction W1 of the combined V-belt 10C, and the thickness direction of the sheet material 115C is along the thickness direction (radial direction R1) of the combined V-belt 10C. . Further, in the core body 13C, portions of the sheet material 115C adjacent to each other in the width direction W1 are in a state of being butted in the width direction W1. In other words, in the core body 13C, the portions adjacent to the width direction W1 in the sheet material 115C do not overlap in the thickness direction (radial direction R1) of the combined V-belt 10C.

  As described above, in the third embodiment, in the combined V-belt 10C, the core formed by the sheet material 115C in the individual unvulcanized belts 100C arranged in the width direction W1 of the combined V-belt 10C. A body 13C can be provided. Therefore, according to this configuration, it is possible to increase the tension that the joint V-belt 10C can practically receive, to reduce the variation in the performance of the joint V-belt 10C, and to reduce the time required for manufacturing. A method of manufacturing the belt 10C can be provided. Further, an extension-side rubber layer 11C is provided between the core body 13C and the tie band 25C. For example, a pair of combined V-belts 10C arranged so that the axial direction is directed in the vertical direction is used to sandwich a conveyed product H such as a carrot leaf portion, and the conveyed product H is rotated by driving the pair of combined V-belts 10C. Is possible to convey the belt in the belt circumferential direction C1. In such a configuration, it is possible to impart sufficient strength to the combined V-belt 10C that can more reliably suppress the slack (curvature due to sagging) of the combined V-belt 10C.

  Further, according to the third embodiment, each belt portion 20C further includes the stretched rubber layer 11C disposed between the core body 13C and the tie band 25C. According to this configuration, the tension that can be practically applied to the combined V-belt 10C can be further increased, and variations in the performance of the combined V-belt 10C can be reduced. Further, an elastic rubber layer 11C is provided between the core body 13C and the tie band 25C. For this reason, in the structure which conveys the conveyed product H to the belt circumferential direction C1 by the rotational drive of a pair of coupling | bonding V belt 10C mentioned above, it is possible to suppress more securely the slack (curvature by drooping) of the coupling V belt 10C. In addition, sufficient strength can be imparted to the combined V-belt 10C.

  Further, according to the third embodiment, the two different directions in the two-way fiber sheet material 119 of the tie band 25C are the belt circumferential direction C1 and the width direction W1, or both are directions intersecting the belt circumferential direction C1. It is. According to this configuration, the strength of the tie band 25C can be further increased. Therefore, the combined V-belt 10 </ b> C can suppress the occurrence of drooping even when it is long, and can convey the conveyed object H without being accurately grasped and dropped over a long period of time.

In the third embodiment, when the bi-directional fiber sheet material 119 of the tie band 25C is formed using an aramid fiber, the basis weight of the bi-directional fiber sheet material 119 is 90 to 870 (g / m ² ). The tensile strength of the bidirectional fiber sheet material 119 is 2060 (N / mm ² ) or more, and the thickness of the bidirectional fiber sheet material 119 is 0.03 to 0.24 (mm). At least one condition is met. Moreover, when the bi-directional fiber sheet material 119 is formed using carbon fiber, the basis weight of the bi-directional fiber sheet material 119 is 200 to 300 (g / m ² ), and the bi-directional fiber sheet material At least one condition that the tensile strength of 119 is 2900 (N / mm ² ) or more and the thickness of the bidirectional fiber sheet material 119 is 0.05 to 0.09 (mm) is satisfied. . According to such a configuration of the bi-directional fiber sheet material 119, it is possible to realize a configuration that can remarkably suppress the slack (curvature due to sagging) of the combined V-belt 10C.

  Further, the rubber hardness of the stretch rubber layer 11C is set to A35 to A65, the hardness when the stretch rubber layer 11C is foamed rubber is set to ASKER C15 to 60, and the thickness of the stretch rubber layer 11C is set to 2 to 10 By setting at least (mm) and satisfying at least one of the conditions that the surface (outer peripheral surface) of the tie band 25C is uneven with warp for the purpose of preventing slippage of the conveyed object, the combined V-belt 10C can be securely gripped with higher strength.

  Depending on the above, when a pair of coupled V-belts 10C is used for the harvesting machine, the combined V-belt 10C is compact in a state in which it is suppressed from bending (sagging) even if it becomes long for the purpose of increasing harvesting capacity. It is also possible to realize a function of accurately grasping the conveyed object H over a long period and conveying it without dropping.

  In addition, D and E types with large belt width (carrying width of the object to be conveyed) as a measure for increasing harvesting capacity are difficult to put into practical use in terms of the belt's own weight and the pulley diameter of the belt driving pulley. Remain. On the other hand, if each belt 20C of the combined V-belt 10C is A, B, C type, thin A, thin B, or thin C type as in the third embodiment, its own weight is light and hardly deformed. . For this reason, even when the amount (the number of crops) transporting the transported object H is large, it is possible to make it difficult for the coupled V-belt 10C to be bent due to excessive weight.

  In the third embodiment, if each belt 20C is A, B, C type, thin A, thin B, thin C type, the belt is superior in flexibility compared to the D, E type belts. Further, the pulley diameter of the pulley necessary for driving the coupling belt 10C may be small, and the harvester can be further downsized.

  Further, according to the third embodiment, the joint V-belt 10C having the wide tie band 25C, and the stretch rubber layer 11C is formed of low-hardness rubber or foam rubber having a gripping force (frictional force). Due to the synergistic effect of being present, the conveyed product H is conveyed with a more reliable clamping force. As a result, the next process (for example, the foliage cutting process) in the harvester is performed at an accurate position, and the loss of the transported article H falling during the transport can be further reduced.

  In addition, for example, when a conveyed product is sandwiched and conveyed by hanging a single belt (single belt) on a plurality of pulleys, a difference in belt length due to a difference in belt length due to a difference in elongation of each belt results in a difference. As a result, there is a possibility that accurate conveyance cannot be performed (the state of the conveyed product is different at the beginning and the end of conveyance). In addition, a difference in tension may occur in each belt due to variations in belt length from the beginning when the belt is attached to the pulley or due to a difference in belt length due to belt elongation. As a result, the conveyance force of the conveyance object by the plurality of belts may be reduced, and the conveyance object may drop. On the other hand, in the case of the combined V-belt 10C of the third embodiment, since a speed difference and a tension difference with time do not occur, an accurate subsequent process (such as foliage cutting) is maintained by accurate conveyance of the conveyed product H. The harvest rate can be stabilized without the transported object H falling.

<Modification of Third Embodiment>
FIG. 34 is a flowchart for explaining an example of a forming process of a combined V-belt as a transmission belt according to a modification of the third embodiment. FIG. 35A is a cross-sectional view showing a step (step S33) of setting the outer covering cloth 16bC to the lower vulcanization mold 6. FIG. 35 (B) is a cross-sectional view showing a step (step S29) of setting each unvulcanized belt 100C to the lower vulcanization mold 6. In the manufacturing method of the combined V-belt according to this modification, instead of step S28 (step of winding the outer covering cloth 16aC around the unvulcanized belt 100C) in FIG. Step). Hereinafter, differences from the third embodiment described with reference to FIG. 34 will be mainly described, and descriptions of other points will be omitted.

  In this modified example related to the third embodiment, after the plurality of unvulcanized belts 100C are formed (that is, after the process of step S27 is performed), as shown in FIG. 35 (A), in step S33, The outer covering cloth 16bC is set in the lower vulcanization mold 6. Specifically, in step S33, the lower covering fabric 16bC is formed so that the lower covering cloth 16bC is in close contact with all of the plurality of grooves 6a formed in the lower vulcanizing mold 6. It is set in the mold 6 for sulfur. Thereafter, in step S29, each unvulcanized belt 100C is fitted into each groove 6a via the covering cloth 16bC. Subsequent steps are the same as the manufacturing method of the combined V-belt 10C described in the third embodiment, and thus description thereof is omitted.

  As described above, the combined V-belt manufactured by the combined V-belt manufacturing method according to the modification of the third embodiment is compared with the combined V-belt 10C manufactured by the manufacturing method described in the third embodiment. Except for the point that the outer cover cloth 16bC is provided between the adjacent belt portions 20C (that is, the point that the outer cover cloth 16bC is provided over the entire width direction of the combined V belt), It has the same configuration. Therefore, also in the present modification, as in the case of the third embodiment, the tension that the transmission belt can practically receive can be increased, the variation in the performance of the transmission belt can be reduced, and the time required for manufacturing can be reduced. It is possible to provide a transmission belt that can be reduced and a method for manufacturing such a transmission belt.

  In the third embodiment and the modifications thereof, an example in which the belt sleeves 101C, 102C, 104C, and 105C are formed using the ribbon-shaped rubber 110 has been described. However, the present invention is not limited to this. Specifically, at least one of the belt sleeves 101C, 102C, 104C, and 105C may be formed of a single rubber sheet.

  The present invention can be widely applied as a transmission belt and a method for manufacturing the transmission belt.

5 Mantle 10, 10A Transmission belt 10B, 10C Combined V-belt (transmission belt)
11, 11C Stretch rubber layer 13, 13A, 13B, 13C Core body 15, 15C Compression rubber layer 20, 20C Belt portion 101, 101C Stretch side belt sleeve 102, 102C Stretch side adhesive belt sleeve (unvulcanized belt sleeve)
105, 105C Compression side belt sleeve 110 Ribbon-shaped rubber 115, 115B Sheet material 119 Bidirectional fiber sheet material 101a, 102a, 104a, 115a Edge 119a First fiber 119b Second fiber B101, B102, B104, B115 Butting position P110 Belt The pitch at which the sheet material is wound around the sleeve R1 The radial direction of the belt sleeve T115 The thickness of the sheet material W110 The width direction of the belt sleeve W115 The width of the sheet material

Claims (18)

Including a core body forming step of forming a core body on the belt sleeve by winding a sheet material around an endless unvulcanized belt sleeve;
The width of the sheet material is set larger than the thickness of the sheet material. It is a manufacturing method of the power transmission belt according to claim 1,
The transmission belt, wherein the sheet material is wound around the belt sleeve so as to avoid portions of the sheet material adjacent to each other in the width direction of the belt sleeve overlapping each other in the radial direction of the belt sleeve. Production method. It is a manufacturing method of the power transmission belt according to claim 2,
The core is formed by spirally winding the sheet material,
A method for manufacturing a transmission belt, wherein a pitch at which the sheet material is wound around the belt sleeve is set to be equal to a width of the sheet material. It is a manufacturing method of the power transmission belt given in any 1 paragraph of Claims 1-3,
The method for manufacturing a transmission belt, wherein the core is formed by laminating the sheet material in a radial direction of the belt sleeve. It is a manufacturing method of the power transmission belt according to claim 4,
Edges of portions adjacent to each other in the width direction of the belt sleeve of the sheet material are abutted at a predetermined abutting position,
The method for manufacturing a transmission belt, wherein the butting position is shifted in the width direction between the sheet materials adjacent in the radial direction. It is a manufacturing method of the power transmission belt given in any 1 paragraph of Claims 1-5,
A belt sleeve forming step of forming the belt sleeve configured to contact the core;
In the belt sleeve forming step, the belt sleeve is formed by winding a plurality of round ribbon-shaped rubbers having a width shorter than the width of the belt sleeve around a mantle,
Edges of portions adjacent to each other in the width direction of the belt sleeve of the ribbon-shaped rubber are butted at a predetermined butting position,
Edges of portions adjacent to each other in the width direction of the belt sleeve of the sheet material of the core body are abutted at a predetermined abutting position,
The method for manufacturing a transmission belt, wherein the butting position in the ribbon rubber and the butting position in the sheet material are shifted in the width direction. It is a manufacturing method of the power transmission belt according to any one of claims 1 to 6,
A belt sleeve forming step of forming the belt sleeve;
As the belt sleeve, an extension side belt sleeve arranged to become an extension rubber layer of the transmission belt and a compression side belt sleeve arranged to become a compression rubber layer of the transmission belt are provided,
As the belt sleeve forming step, an extension side belt sleeve forming step for forming the extension side belt sleeve is performed prior to the core body forming step, and a compression side belt sleeve is formed after the core body forming step. And a compression-side belt sleeve forming step. It is a manufacturing method of the power transmission belt according to any one of claims 1 to 6,
A belt sleeve forming step of forming the belt sleeve;
The belt sleeve is provided with a compression side belt sleeve arranged to be a compression rubber layer of the transmission belt,
As the belt sleeve forming step, a compression side belt sleeve forming step that is performed prior to the core body forming step and forms the compression side belt sleeve is provided,
An unvulcanized belt forming step of forming a plurality of unvulcanized belts by cutting the belt sleeve formed with the core body in the core body forming step along a circumferential direction of the belt sleeve;
An unvulcanized belt coupling step for coupling the plurality of unvulcanized belts to each other via a connecting portion;
The manufacturing method of the power transmission belt characterized by further including these. It is a manufacturing method of the power transmission belt according to any one of claims 1 to 6,
A belt sleeve forming step of forming the belt sleeve;
The belt sleeve is provided with a compression side belt sleeve arranged to be a compression rubber layer of the transmission belt, and an extension side belt sleeve arranged to be an extension rubber layer of the transmission belt,
As the belt sleeve forming step, a compression side belt sleeve forming step for forming the compression side belt sleeve and an extension side belt sleeve forming step for forming the extension side belt sleeve are provided.
Unvulcanized belt formation that forms a plurality of unvulcanized belts by cutting the belt sleeve formed with the compression side belt sleeve, the extension side belt sleeve, and the core along the circumferential direction of the belt sleeve Steps,
An unvulcanized belt coupling step of coupling the plurality of unvulcanized belts to each other via a coupling unit coupled to the extension side belt sleeve;
The manufacturing method of the power transmission belt characterized by further including these. An endless transmission belt provided with a compressed rubber layer,
It has a sheet material whose width is set larger than the thickness, and the width direction of the sheet material provided on the outer peripheral surface side of the compressed rubber layer is along the width direction of the transmission belt and the thickness direction of the sheet material Further comprising a core body that is in a state along the thickness direction of the transmission belt. The power transmission belt according to claim 10,
In the core, a portion of the sheet material adjacent in the width direction of the transmission belt does not overlap in the thickness direction of the transmission belt. The power transmission belt according to claim 10 or 11,
The power transmission belt according to claim 1, wherein the core body includes a plurality of the sheet materials stacked in the thickness direction of the power transmission belt. The power transmission belt according to claim 12,
Of the sheet material, the edges of portions adjacent to each other in the width direction of the transmission belt are in a state of being abutted at a predetermined abutting position,
The transmission belt, wherein the butting position is shifted in the width direction of the transmission belt between the sheet materials adjacent to each other in the thickness direction of the transmission belt. The transmission belt according to any one of claims 10 to 13,
Each of the plurality of belt portions as the power transmission belt formed in an endless shape having the compression rubber layer and the core body,
A connecting portion that connects the plurality of belt portions arranged in the width direction of the belt portion;
A transmission belt, further comprising: The transmission belt according to claim 14,
Each of the belt portions further includes a stretched rubber layer disposed between the core body and the connecting portion. The transmission belt according to claim 15,
The connecting portion is formed by using a bi-directional fiber sheet material including first fibers and second fibers that extend in two different directions.
The two different directions are the circumferential direction and the width direction of the transmission belt, or both are directions intersecting the circumferential direction. The transmission belt according to claim 16, wherein
The bidirectional fiber sheet material is formed using aramid fibers,
The basis weight of the bidirectional fiber sheet material is 90 to 870 (g / m ² ), the tensile strength of the bidirectional fiber sheet material is 2060 (N / mm ² ) or more, and the bidirectional fiber sheet. A power transmission belt characterized in that at least one of the conditions that the thickness of the material is 0.03 to 0.24 (mm) is satisfied. The transmission belt according to claim 16, wherein
The bidirectional fiber sheet material is formed using carbon fiber,
The basis weight of the bidirectional fiber sheet material is 200 to 300 (g / m ² ), the tensile strength of the bidirectional fiber sheet material is 2900 (N / mm ² ) or more, and the bidirectional fiber sheet. A power transmission belt characterized in that at least one condition of a material thickness of 0.05 to 0.09 (mm) is satisfied.

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