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WO2019230759A1 - Procédé de fabrication de pneu - Google Patents

Procédé de fabrication de pneu Download PDF

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Publication number
WO2019230759A1
WO2019230759A1 PCT/JP2019/021223 JP2019021223W WO2019230759A1 WO 2019230759 A1 WO2019230759 A1 WO 2019230759A1 JP 2019021223 W JP2019021223 W JP 2019021223W WO 2019230759 A1 WO2019230759 A1 WO 2019230759A1
Authority
WO
WIPO (PCT)
Prior art keywords
resin member
tire
belt
shape
pneumatic tire
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2019/021223
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English (en)
Japanese (ja)
Inventor
誓志 今
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bridgestone Corp
Original Assignee
Bridgestone Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bridgestone Corp filed Critical Bridgestone Corp
Publication of WO2019230759A1 publication Critical patent/WO2019230759A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/70—Annular breakers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
    • B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers

Definitions

  • the present invention relates to a method for manufacturing a pneumatic tire.
  • a belt is usually disposed outside the carcass in the tire radial direction in order to improve tire performance (for example, Patent Document 1).
  • the belt shall have a state in which a resin-coated cord or a rubber-coated cord coated with a coating material such as resin or rubber is spirally wound in the tire circumferential direction (hereinafter referred to as a spiral belt). Has also been proposed.
  • the belt may be required to be configured to have a predetermined diameter difference in the tire width direction according to the required tire performance.
  • the belt may be given a predetermined shape by expansion during tire vulcanization, but in the case of a so-called spiral belt, the rigidity in the tire circumferential direction is high. It is difficult to give a difference.
  • an object of the present invention is to provide a method for manufacturing a pneumatic tire that can impart a predetermined diameter difference to a belt by a simple method.
  • the gist configuration of the present invention is as follows.
  • the method for producing a pneumatic tire of the present invention includes: A step of preparing a cylindrical resin member; Transforming the resin member into a predetermined shape; Forming a belt having the cord by winding a cord coated with a coating material around the axis of the resin member on the resin member deformed into the predetermined shape.
  • FIG. 1 It is a perspective view which expands and shows a part of jig concerning FIG. It is a perspective view which shows the state in which the heated resin member was set to the jig. It is a perspective view which shows typically a mode that the resin member of the state set to the jig thermally contracts with an arrow. It is a fragmentary perspective view which shows a mode that the shape of the resin member followed the shape of the jig. It is a tire width direction schematic sectional drawing which shows an example of the manufactured pneumatic tire. It is a figure which shows typically the side view of an example of a jig. It is a figure which shows typically the side view of an example of the jig at the time of taking out the resin member.
  • FIG. 1 shows a cylindrical resin member 100.
  • the resin member 100 has a circular arbitrary cross-sectional shape perpendicular to the axial direction.
  • the cylindrical resin member 100 has a predetermined thickness (not particularly limited, for example, 0.1 to 3.0 mm), and the predetermined thickness is equal to the thickness of the resin member 100 when the tire is completed. It can be substantially the same.
  • Such a cylindrical resin member 100 can be formed by, for example, resin extrusion molding.
  • thermoplastic elastomer for example, a thermoplastic elastomer or a thermoplastic resin can be used, and a resin that is cross-linked by heat or an electron beam or a resin that is cured by thermal dislocation can also be used.
  • thermoplastic elastomers polyolefin-based thermoplastic elastomer (TPO), polystyrene-based thermoplastic elastomer (TPS), polyamide-based thermoplastic elastomer (TPA), polyurethane-based thermoplastic elastomer (TPU), polyester-based thermoplastic elastomer (TPC) And dynamic crosslinkable thermoplastic elastomer (TPV).
  • thermoplastic resin examples include polyurethane resin, polyolefin resin, vinyl chloride resin, polyamide resin and the like.
  • the deflection temperature under load (at the time of 0.45 MPa load) specified in ISO75-2 or ASTM D648 is 78 ° C or more, and the tensile yield strength specified in JIS K7113 is used.
  • a material having a tensile breaking elongation of 50% or more as defined in JIS K7113 and a Vicat softening temperature (Method A) as defined in JIS K7206 of 130 ° C. or more can be used.
  • the tensile modulus of elasticity (specified in JIS K7113: 1995) of this resin is preferably 50 MPa or more. This is because steering stability and the like can be improved. Moreover, it is preferable that the tensile elasticity modulus of this resin shall be 1000 Mpa or less. It is because riding comfort etc. can be maintained favorable. Note that the resin here does not include rubber (an organic polymer substance exhibiting rubber elasticity at room temperature).
  • the cylindrical resin member 100 is cut perpendicularly to the axial direction so as to have a predetermined width W in the axial direction.
  • the predetermined width W can be determined according to the width of the resin member 100 in the tire width direction when the tire is completed.
  • the resin member 100 can be cut by any known method such as mechanical cutting or melting.
  • the cylindrical resin member 100 is prepared.
  • FIG. 3 is a perspective view showing an example of a jig 200 used when the resin member 100 is deformed into a predetermined shape.
  • the jig 200 has a cylindrical shape.
  • the jig 200 is formed by connecting a large number of rod-shaped members 200a whose longitudinal direction is the axial direction of the cylinder in the circumferential direction.
  • the jig 200 (bar-shaped member 200a) can be made of, for example, aluminum.
  • FIG. 4 is an enlarged perspective view showing a part of the jig 200.
  • the jig 200 is configured such that the inner surface thereof has a predetermined diameter difference in the axial direction (the diameter R is different).
  • the diameter R gradually decreases from the axial center to the end.
  • the resin member 100 heated to near the melting point expands, and a part of FIG.
  • the shape of the resin member 100 follows the shape of the inner surface of the jig 200.
  • the resin member 100 can be deformed into a predetermined shape (in this embodiment, the shape in which the diameter of the cylinder gradually decreases from the axial center to the end of the resin member 100).
  • a cord covered with a coating material is wound around the axis of the resin member 100 on the resin member 100 deformed into a predetermined shape.
  • a so-called spiral belt can be easily formed using the resin member 100 as a base, and the spiral belt also has a predetermined shape (in this embodiment, from the center to the end in the width direction of the belt). (For example, a shape in which the outer diameter is gradually reduced).
  • the belt may be a spiral belt in which a rubber-coated cord, in which the cord is covered with a coating rubber, is wound around the axis of the resin member 100, that is, around the axis of the tire.
  • a rubber-coated cord in which the cord is covered with a coating rubber
  • the cord any known material can be used, for example, a steel cord can be used.
  • the steel cord can be made of, for example, steel monofilament or stranded wire.
  • an organic fiber, carbon fiber, etc. can also be used for a cord.
  • nylon or the like can be used as the organic fiber, and a single fiber or a plurality of single fibers twisted together can be used.
  • the covering rubber any known rubber material such as a rubber material usually used for belt coating rubber can be used.
  • the belt may be a spiral belt in which a resin-coated cord whose cord is coated with a coating resin is spirally wound around the axis of the resin member 100, that is, around the axis of the tire. it can.
  • any known material can be used for the cord, for example, a steel cord can be used.
  • the steel cord can be made of, for example, steel monofilament or stranded wire.
  • an organic fiber, carbon fiber, etc. can also be used for a cord.
  • nylon or the like can be used as the organic fiber, and a single fiber or a plurality of single fibers twisted together can be used.
  • the coating resin can be the same type of resin as the resin member 100, but a different resin may be used.
  • the resin-coated cord can be formed, for example, by coating a molten coating resin on the outer peripheral side of the cord and solidifying by cooling.
  • the tire molding process of the other tire members is performed by a normal method (the order of the resin member 100 and the spiral belt molding process is not particularly limited, and can be performed according to the custom). And a normal tire vulcanization process is performed after that and a pneumatic tire is manufactured.
  • the cylindrical resin member 100 and the jig 200 are prepared, the cylindrical resin member 100 is deformed into a predetermined shape, and the deformed resin member 100 is used.
  • the resin member 100 and the spiral belt can be easily formed in a predetermined shape (in this embodiment, from the center in the axial direction toward the end).
  • the diameter R can be gradually reduced). For this reason, compared with the case where the base etc. which extrude the resin member 100 for every various shape of the resin member 100 and spiral belt according to a tire size, a tire structure, etc. are uniformly prepared, it is simple and low-cost. Can be manufactured.
  • the spiral belt can wind the covering cord with the resin member 100 as a base, the workability of the spiral belt winding process is excellent.
  • a predetermined diameter difference can be imparted to the belt by a simple method.
  • FIG. 8 is a perspective view showing another example of the jig 200.
  • FIG. 9 is an enlarged perspective view showing a part of the jig 200.
  • the jig 200 has a cylindrical shape.
  • the jig 200 is formed by connecting a large number of rod-shaped members 200 a whose longitudinal direction is the axial direction of the cylinder in the circumferential direction.
  • the jig 200 (bar-shaped member 200a) can be made of, for example, aluminum.
  • the jig 200 is configured such that the outer surface thereof has a predetermined diameter difference in the axial direction (diameter R is different).
  • the diameter R gradually decreases from the axial center to the end.
  • the diameter of the inner surface of the resin member 100 is substantially the same as the diameter of the outer surface of the jig 200 (for example, the diameter at the same position in the axial direction) to facilitate fitting.
  • the resin member 100 to which heat has been applied is thermally contracted, for example, by being placed at room temperature, and closely contacts the outer surface of the jig 200.
  • the shape of the resin member 100 (softened by heating) follows the outer surface shape of the jig 200.
  • the resin member 100 can be deformed into a predetermined shape (in this embodiment, the shape in which the diameter of the cylinder gradually decreases from the axial center to the end of the resin member 100).
  • the cord covered with the coating material is then wound around the axis of the resin member 100 on the resin member 100 deformed into a predetermined shape. Accordingly, a so-called spiral belt can be easily formed using the resin member 100 as a base, and the spiral belt also has a predetermined shape (in this embodiment, from the center to the end in the belt width direction). Can be added.
  • a normal tire vulcanization process is performed and a pneumatic tire is manufactured. Even in this case, a predetermined diameter difference can be given to the belt by a simple method.
  • the cylindrical resin member 100 having three or more types of diameters, the cylindrical resin member 100 having an appropriate diameter is prepared according to the tire size and the like, and the resin member is obtained by heat and / or force. This is because it is possible to suppress a failure of the resin member 100 due to an unreasonable deformation while making the deformation easy by reducing the amount of deformation required when deforming 100. On the other hand, it is because it can be made still simpler and low-cost by setting it as ten types or less. For example, one type can be prepared for every 50 mm in diameter.
  • the cross-sectional shape of the prepared cylindrical resin member 100 may be constant in the axial direction or may be changed in the axial direction.
  • the resin member 100 and the spiral belt may have various shapes, and are prepared instead of or in addition to providing the resin member 100 with the shape in the process of applying heat and / or force.
  • the cylindrical resin member 100 extended long in an axial direction is used for the tire width direction of the resin member 100 in the finished pneumatic tire like said embodiment.
  • such a cutting process can be omitted by preparing a cylindrical resin member having a predetermined width in advance.
  • the resin member 100 to be prepared is uniform in the circumferential direction (having no joints or steps). This is because the uniformity of the tire circumferential direction of the finished pneumatic tire can be improved, and the durability and riding comfort of the tire can be improved.
  • a resin member 100 can be formed by pouring molten resin into a mold that is uniform in the circumferential direction (having no joints or steps), cooling and solidifying it, and taking it out in the axial direction.
  • the step of deforming the resin member 100 into a predetermined shape is preferably performed by applying heat and / or force to the resin member 100. .
  • the resin member 100 can be deformed into a predetermined shape by a simpler method.
  • various methods other than the above can be employed. For example, a force can be applied to the cylindrical resin member 100 (without applying heat), and the plastic resin member 100 can be brought into close contact with a jig having a predetermined shape and plastically deformed to follow the predetermined shape of the jig. .
  • the predetermined shape is preferably a shape in which the diameter of the cylinder is different in the axial direction of the cylindrical resin member 100 as in the above embodiment. . This is because a belt having a diameter difference in the tire width direction can be easily formed.
  • the predetermined shape is a size of the diameter of the cylinder at least in a part in the axial direction from the axial center to the end of the cylindrical resin member 100.
  • the shape gradually decreases. This is because a belt having a shape whose diameter gradually decreases from the center in the tire width direction toward the end can be easily formed. For example, it may be advantageous to improve the uneven wear resistance of a tire that easily undergoes center wear.
  • the predetermined shape is a shape in which the diameter of the cylinder gradually increases from the axial center to the end of the cylindrical resin member 100. Is also preferable.
  • the predetermined shape is not limited to these cases.
  • the diameter of the cylinder from the axial center to the end of the cylindrical resin member 100 is not limited. It can also be made into the shape which has one place or more each of the location where the magnitude
  • FIG. 13 is a schematic cross-sectional view in the tire width direction showing an example of a pneumatic tire manufactured using the method for manufacturing a pneumatic tire according to the embodiment.
  • the pneumatic tire 1 of the present embodiment (hereinafter also simply referred to as a tire) includes a carcass 3 straddling a bead core 2 a embedded in a pair of bead portions 2 in a toroidal shape.
  • the tire 1 includes a belt 4 and a tread 5 in this order on the outer side in the tire radial direction of the crown portion of the carcass 3.
  • the tire 1 of the present embodiment has the same configuration between the half portions in the tire width direction with the tire equatorial plane CL as a boundary, but can also have an asymmetric configuration. .
  • This tire 1 has a bead core 2a in which steel cords are bundled.
  • the material and shape of the bead core are not particularly limited, or may have a structure without the bead core 2a.
  • the carcass 3 is comprised by the one carcass ply consisting of organic fiber, the material and the number of carcass plies are not particularly limited.
  • the belt 4 is a spiral belt in a state where a rubber-coated cord in which a cord 4b is coated with a coated rubber 4a is spirally wound around a tire axis.
  • the belt 4 has a diameter difference in the tire width direction. Specifically, the diameter gradually decreases from the center in the tire width direction toward the end.
  • the belt 4 is preferably a single layer. It is because it is preferable from a viewpoint of weight reduction. Also in this case, the width of the belt 4 in the tire width direction can be, for example, 90 to 120% of the tire ground contact width.
  • the thickness (maximum thickness) of the belt 4 is not particularly limited, but may be, for example, 0.3 to 3.5 mm.
  • the belt 4 may be a spiral belt in which a resin-coated cord in which a cord 4b is coated with a coating resin 4a is spirally wound around a tire axis. Also in this case, the belt 4 is preferably a single layer. It is because it is preferable from a viewpoint of weight reduction.
  • the width of the belt 4 in the tire width direction can be, for example, 90 to 120% of the tire ground contact width.
  • the thickness (maximum thickness) of the belt 4 is not particularly limited, but may be, for example, 0.3 to 3.5 mm.
  • tire contact width means that the tire is applied to the outermost position in the tire width direction of the contact surface when the tire is mounted on the applicable rim, filled with the specified internal pressure, and the maximum load is applied. Mounted on the rim, filled with the specified internal pressure, and defined as the distance in the tire width direction between the ground contact edges in a no-load state. In addition, other dimensions in the present specification are measured in a state in which a tire is mounted on an applicable rim, filled with a specified internal pressure, and in a no-load state.
  • appcable rim is an industrial standard effective in the region where tires are produced and used.
  • JATMA Joint Automobile Tire Association
  • JATMA YEAR BOOK and in Europe, ETRTO (The European) Tire and Rim Technical Organization's STANDARDDS MANUAL, in the United States TRA (The Tire and Rim Association, Inc.) YEAR BOOK, etc.
  • Standard rim (ETRTOSTANDAND in the applicable size to be described in the future) Refers to Measuring Rim, TRA's YEAR BOOK, Design Rim) (ie, “Rim” above) In addition to the current size, it includes the size that can be included in the above industrial standards in the future.As an example of “future size to be described”, it is described as “FUTURE DEVELOPMENTS” in ETRTO STANDARDDS MANUAL 2013 edition. However, in the case of a size not described in the industry standard, it means a rim having a width corresponding to the tire bead width.
  • the “specified internal pressure” refers to an air pressure (maximum air pressure) corresponding to the tire maximum load capacity of the standard such as JATMA in a tire of an applicable size. In the case of a size not described in the industry standard, the “specified internal pressure” refers to an air pressure (maximum air pressure) corresponding to a maximum load capacity specified for each vehicle on which a tire is mounted. “Maximum load load” is the tire maximum load capacity of the standard such as JATMA for the tire of the applicable size, or, in the case of a size not described in the industry standard, the maximum load capacity defined for each vehicle on which the tire is mounted. Means the load corresponding to.
  • the tire 1 includes a resin member 6 (100) continuously extending in the tire width direction, which is plate-shaped in this example, on the inner side in the tire radial direction of the belt 4. .
  • the resin member 6 (100) is disposed on the inner side in the tire radial direction of the belt 4, but the resin member 6 (100) may be disposed on the outer side in the tire radial direction of the belt 4. .
  • the width of the resin member 6 (100) in the tire width direction is larger than the width of the belt 4 in the tire width direction, but may be the same or smaller.
  • the width of the resin member 6 (100) in the tire width direction can be, for example, 80 to 130% of the tire ground contact width.
  • the resin member 6 (100) has a diameter difference in the tire width direction. Specifically, the diameter gradually decreases from the center in the tire width direction toward the end (for example, the end diameter R1 ⁇ the diameter R2 near the center). ).
  • the belt 4 also has a diameter difference in the tire width direction. Specifically, the diameter gradually decreases from the center in the tire width direction toward the end (for example, end diameter R3 ⁇ diameter R4 near the center).
  • FIG. 14 is a diagram schematically illustrating a side view of an example of a jig.
  • the rod-shaped members 32A whose inner peripheral side is longer than the outer peripheral side and rod-shaped members 32B whose outer peripheral side is longer than the inner peripheral side are alternately arranged in the circumferential direction.
  • the number of rod-like members 32A and 32B is less than that shown in FIGS.
  • FIG. 15 is a diagram schematically illustrating a side view of an example of a jig when the resin member is taken out.
  • the jig 32 is reduced in diameter by sliding one of the rod-like members 32A (P3) whose inner peripheral side is longer than the outer peripheral side inward in the radial direction, and the state shown in FIG. From this, the resin member can be taken out.
  • this invention is not limited to said embodiment at all.
  • the step of deforming the resin member 100 into a predetermined shape and the step of winding a cord coated with a coating material around the axis of the resin member 100 on the resin member 100 deformed into the predetermined shape
  • a step of joining two or more deformed resin members 100 in the axial direction may be further included.
  • an asymmetric shape for example, a diameter
  • a resin member 100 having a shape in which the difference is different between the half portions in the tire width direction can be obtained.
  • the spiral belt wound around the resin member 100 also has a similar (for example, asymmetric) shape with the tire equatorial plane CL as a boundary.
  • the resin member 6 (100) having a predetermined shape and the belt 4 wound around the axis on the resin member 6 (100) have shapes obtained through a vulcanization process or the like. Except for the point which is doing, it is not limited at all.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tires In General (AREA)
  • Tyre Moulding (AREA)

Abstract

Ce procédé de fabrication d'un pneu comprend une étape dans laquelle un élément en résine cylindrique circulaire est préparé, une étape dans laquelle l'élément en résine est déformé en une forme prédéterminée, et une étape dans laquelle un cordon revêtu d'un matériau de revêtement est enroulé, autour de l'axe de l'élément en résine, sur l'élément en résine ayant été déformé dans la forme prédéterminée, formant ainsi une courroie ayant le cordon.
PCT/JP2019/021223 2018-05-31 2019-05-29 Procédé de fabrication de pneu Ceased WO2019230759A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2018-105613 2018-05-31
JP2018105613A JP2019209530A (ja) 2018-05-31 2018-05-31 空気入りタイヤの製造方法

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WO2019230759A1 true WO2019230759A1 (fr) 2019-12-05

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01249429A (ja) * 1988-03-31 1989-10-04 Sumitomo Rubber Ind Ltd ベルト・トレッド組立体の成形方法およびその装置
JP2011207100A (ja) * 2010-03-30 2011-10-20 Yokohama Rubber Co Ltd:The 空気入りタイヤの製造方法
JP2012046023A (ja) * 2010-08-25 2012-03-08 Bridgestone Corp タイヤ、及びタイヤの製造方法
WO2018074284A1 (fr) * 2016-10-18 2018-04-26 株式会社ブリヂストン Pneu

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01249429A (ja) * 1988-03-31 1989-10-04 Sumitomo Rubber Ind Ltd ベルト・トレッド組立体の成形方法およびその装置
JP2011207100A (ja) * 2010-03-30 2011-10-20 Yokohama Rubber Co Ltd:The 空気入りタイヤの製造方法
JP2012046023A (ja) * 2010-08-25 2012-03-08 Bridgestone Corp タイヤ、及びタイヤの製造方法
WO2018074284A1 (fr) * 2016-10-18 2018-04-26 株式会社ブリヂストン Pneu

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