JPH06337038A - Transmission belt and manufacture thereof - Google Patents

Abstract

PURPOSE:To prevent interference sound caused by a gap interference between a belt and a tension pulley when a transmission belt, in which a mark is transferred on a belt back face part, is used by back face wrapping. CONSTITUTION:In a belt main body back face part e1 of a belt main body 1, a mark transferred area e2, onto which a mark (d) is transferred, and other parts but the mark transferred area e2 are formed into an approximately uniform face, so that a gap part is not formed in a boundary part between the mark transferred area e2 and other parts.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to automobiles, general machinery,
The present invention relates to a transmission belt that is used for back-hanging on an agricultural machine or the like and has a mark transferred to the back surface of the belt body, and a method for manufacturing the same.

[0002]

2. Description of the Related Art As is well known, on the back surface of a transmission belt such as a V-ribbed belt, a mark such as a trade name, belt manufacturer or size is printed by a transfer method or the like. The mark to be printed is formed by the procedure as shown in FIG. That is,
As shown in FIG. 6A, during belt molding, the mark transfer material b is provided between the reinforcing canvas of the belt molded body a and the mold so as to correspond to the belt width direction S, that is, the belt width direction S. The mark is sandwiched so as to be printed by the transfer method, and is printed (transferred) by applying pressure and heating during vulcanization. Then, after the transfer is completed, as shown in FIG.
When the mark transfer material b is peeled off from the belt molded body a as shown by the arrow and removed, the mark d is printed.
After that, as shown in FIG. 6C, the desired belt c is obtained by cutting the belt molded body a into a predetermined width.

By the way, as shown in FIGS. 7 and 8, the mark transfer material b used in the above method is a side edge b.
1, b1 have a straight shape, for example, the width W1 is 30 mm, the thickness H1 is 120 μ, and the mark d is printed on the surface thereof. Therefore, when the mark transfer material b is used to transfer the mark to the surface of the reinforcing canvas of the belt molded body a according to the procedure shown in FIG. 6,
Since the mark transfer material b itself has a constant thickness (thickness H1), as shown in FIG.
A step portion f is formed as a trace of separation of the mark transfer material b on the belt body rear surface portion e1 of the belt e (transmission belt) in which is embedded, and the mark d is printed on the bottom surface of the step portion f.

However, there is no problem in using the belt e having the stepped portion f wound around it between the pulleys, but when the belt e is driven rearward by the tension pulley, as shown in FIG. In addition, there is an inconvenience that an abnormal noise (interference noise) is generated when the step f of the belt e moves to the tension pulley 10.

In particular, when such a belt is used as a rib belt for an automobile used on the back side, noise from the bonnet portion becomes large, which is not desirable for the automobile industry aiming for low noise.

Therefore, in order to reduce the generation of the abnormal noise, a mark transfer material shown in FIGS. 11 to 13 is used instead of the mark transfer material b shown in FIG. 7 in which both side edges are wavy or zigzag. There is a method of transferring the mark to the back surface of the belt body. That is, the mark transfer material C1 shown in FIGS. 11 and 12 has a width W2 of 30 mm and a thickness H2, for example.
Is 120 μ, a mark d is printed on the upper surface 1a, and both side edges 1b, 1b are formed in a regular zigzag shape (waveform shape) in which triangular peaks and valleys are repeated. The opening angle θ at the side edge portion is 90 °, and the pitch P is 5.66 mm. Further, the mark transfer material C2 shown in FIG. 13 has the same width and thickness as the mark transfer material, and both side edges 6a, 6a are curved ridges 6b.
And the valley portions 6c are formed in a regular repeating waveform shape. The stepped portion on the back surface of the belt body obtained by using the mark transfer materials C1 and C2 does not have a linear shape but has a wavy shape or a zigzag shape like the side edge portions of the mark transfer materials C1 and C2. When such a belt is used on the back side, the stepped portion of the belt and the pulley interfere with each other in a stepwise manner, which has an advantage that interference noise can be reduced (see Japanese Utility Model Laid-Open No. 4-126270).

[0007]

However, the belt obtained by the above means does not completely eliminate the stepped portion, but merely reduces the interference noise. Therefore, it is not suitable for applications requiring higher quietness, and development of a transmission belt that completely eliminates interference noise has been desired.

The present invention has been made in view of the above points, and it is an object of the present invention to completely eliminate a step in the mark transfer region on the back surface of the belt main body of the transmission belt so that the back surface can be covered. The purpose of this is to eliminate the interference sound generated between the tension pulley during use.

[0009]

In order to achieve the above object, in the invention of claim 1, in a transmission belt having a mark transferred to the back surface of the belt body, the transfer area surface of the mark is the transfer area surface. It is configured to be formed substantially flush with the rest of the back surface of the belt body.

According to a second aspect of the present invention, in the method of manufacturing a transmission belt for transferring marks to the back surface of the belt body, the transfer material mounting is usually performed to mount the mark transfer material at a predetermined position on the back surface of the belt body before vulcanization. Step, and then a transfer step of applying pressure or pressure and heating to such an extent that vulcanization does not proceed to the mark transfer material, and after passing through the transfer step, the mark transfer material is peeled off from the back surface of the belt body. And a vulcanization step of normally vulcanizing the belt.

According to a third aspect of the present invention, in the method of manufacturing a transmission belt for transferring marks to the back surface of the belt body, the transfer placing step of placing the mark transfer material at a predetermined position on the back surface of the belt body after vulcanization. And a transfer material peeling step of peeling the mark transfer material from the back surface of the belt main body after the transfer step and the transfer step of applying pressure and heat to the mark transfer material for a short time. I am trying.

According to a fourth aspect of the present invention, in the method of manufacturing a power transmission belt according to the second or third aspect, when the back surface of the belt main body is made of canvas, the mark by the mark transfer material is transferred to the surface of the canvas. Prior to this, the surface of the canvas is previously covered with rubber to eliminate the unevenness of the surface of the canvas.

[0013]

According to the first aspect of the invention, the mark transfer area formed on the back surface of the belt main body of the transmission belt is formed substantially flush with the other areas except the transfer area. There is no substantial step portion at the boundary with other portions except the transfer area. Therefore, when this transmission belt is used on the back side, there is no step interference with the tension pulley, and no abnormal noise is generated due to the step interference.

According to the second aspect of the present invention, before the normal vulcanization of the belt, the mark is transferred to the back surface of the belt main body by the mark transfer material so that the mark is pressed or transferred under the condition that the pressurization and the heating to the extent that vulcanization does not proceed. And the belt is usually vulcanized after the transfer. For this reason, the back surface of the belt main body and the rubber layer inside thereof are not softened at the time of transfer of the mark, and therefore, the back surface of the belt main body is not stepped due to the thickness of the mark transfer material.

According to the third aspect of the invention, after the normal vulcanization of the belt, the mark is transferred to the back surface of the belt main body by the mark transfer material under the transfer condition of pressurization and heating for a short time. At the time of transfer of this mark, the belt is usually already cured by vulcanization, and under the transfer conditions of short-time pressurization and heating, the back surface of the belt main body and the rubber layer inside it are not softened, and the mark is simply transferred. However, the thickness of the mark transfer material does not cause a step on the back surface of the belt body. Thus, according to the invention of claim 2 or 3, the marks are not transferred at the same time when the belt is vulcanized, but the marks are transferred under a specific condition before or after the vulcanization of the belt. Therefore, no stepped portion is formed on the back surface of the belt body, and it is possible to significantly reduce the generation of abnormal noise when the back cover is used.

Further, according to the invention of claim 4, when the back surface of the belt is made of canvas, the surface of the canvas is uneven by applying a rubber stopper to the surface of the canvas before transferring the mark to the surface of the canvas. Since the surface of the canvas is eliminated, the surface of the canvas becomes a smooth surface, and a clean transfer can be performed without uneven transfer.

[0017]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view of a power transmission belt according to an embodiment of the present invention. This belt has a belt body 1 in which a core wire g is embedded in a belt longitudinal direction, and a belt body back surface e1 of the belt body 1 is provided. A mark d is printed on a predetermined portion by a transfer method. Of the belt body rear surface portion e1, particularly the mark transfer area e2 is substantially flush with the other belt body rear surface portion e1 excluding the mark transfer area e2,
There is no step at the boundary between the mark transfer area e2 and the other belt body back surface e1 except the mark transfer area e2.

Next, an example of a method of manufacturing this transmission belt will be specifically described with reference to FIGS. (Manufacturing Example 1) FIGS. 2 and 3 are a front view and a side view of a transfer device for transferring a mark to the back surface of the belt main body of the transmission belt. In these drawings, 2 is a heat having an axis in the horizontal direction. Drum (length 300mm, diameter 180mm)
The shaft 2a is rotatably supported by a support frame 4 attached to the tip of a rod 3a of a hydraulic cylinder 3 extending in the vertical direction. On the other hand, reference numeral 5 denotes a rotary drum which is rotatably supported by a bearing portion 5a below the heat drum 2 such that its axis is parallel to the axis of the heat drum 2 and which is rotated by a drive source (not shown). The belt 1 on which the marks are to be transferred is suspended from the drum 5 with its back surface facing outward. Then, guides 6 and 6 are provided between the heating drum 2 and the rotary drum 5.
Mark transfer material A (mark width 150
mm) with the transfer surface facing downward and facing the back surface of the belt 1. The mark transfer material A is, for example, acetate or paper-clad medium paper with screen-printed characters and has a thickness of 50 to
The one with 120μ is used.

Using the transfer device thus constructed, first, the belt 1 before vulcanization is wound around the rotary drum 5 with the back surface of the belt main body facing outward.
In parallel with this, the mark transfer material A on which a predetermined mark is printed is set in the guides 6 and 6 so that the mark printing surface is placed at a predetermined position on the back surface of the belt body. Then, the extension operation of the hydraulic cylinder 3 lowers the thermal drum 2 attached to the tip of the rod 3a to bring the mark transfer material A and the belt 1 into close contact with the rotating drum 5, and the hydraulic pressure is applied to the mark transfer material A. While applying pressure by the cylinder 3 (cylinder pressure 7.5 Kgf / cm ² ) and heating by a heating device (not shown) to such an extent that vulcanization does not proceed (temperature 120 ° C.), the belt 1 is moved for 150 mm / 50 seconds ( Mark transfer material A
When the pressure to 15 kgf / cm ² is set to 15 Kgf / cm ² , the belt 1 is moved at 150 mm / 38 seconds) to perform transfer. As a result, the mark of the mark transfer material A is transferred onto the back surface of the belt body of the belt 1. Thereafter, the mark transfer material A is peeled off from the back surface of the belt main body, the belt 1 is normally vulcanized by a vulcanizer, and after vulcanization, the belt 1 is cut into a predetermined width to obtain a desired transmission belt.

(Manufacturing Example 2) In Manufacturing Example 1, the case where the belt before the normal vulcanization is used as the belt wound around the rotary drum has been described. However, as another manufacturing example, the belt after the normal vulcanization is used instead of the belt. A similar transmission belt can be manufactured by using the belt. That is, in this case, the belt 1 after the normal vulcanization is wound around the rotary drum 5 so that the back surface of the belt body faces outward, and then the thermal drum 2 lowered by the hydraulic cylinder 3 is used. The mark transfer material A that is brought into close contact with the back surface portion of the belt 1 is applied with pressure and heat for a short time. At this stage, the mark of the mark transfer material A is transferred to the back surface of the belt main body of the belt 1, the mark transfer material A is peeled off from the back surface of the belt main body, and thereafter, the same procedure as in Manufacturing Example 1 is performed. To obtain the desired transmission belt.

(Manufacturing Example 3) Further, in the manufacturing example 1 or 2, when the back surface of the belt main body is composed of a canvas in particular, before the mark by the mark transfer material is transferred to the surface of the canvas, the above-mentioned After the surface of the canvas is covered with rubber, it is subjected to the predetermined procedure of Production Example 1 or 2.
That is, the canvas surface has unevenness due to the texture of the fabric, but when the surface of the canvas is glued with rubber, the texture is filled by means such as coating or soaking, and the surface of the canvas is covered to such an extent that the roughness is eliminated. The surface of the canvas is smoothed by the rubber layer that covers the surface of the canvas, which has the advantage that the mark image during transfer becomes clearer.

As shown in FIG. 1, the belts obtained in Production Examples 1 and 2 are, as shown in FIG. 1, of the belt rear surface portion e1, particularly the mark transfer area e2 except for the mark transfer area e2. The mark transfer area e2 and the mark transfer area e2 are formed to be substantially flush with e1.
There is substantially no stepped portion at the boundary portion with the belt body back surface portion e1 other than. Therefore, there is no step difference between the tension pulley and the back surface of the belt body, and there is an effect that no abnormal noise is generated due to the step interference. Especially,
In the case of the belt obtained in Production Example 3, in addition to the above effects,
Compared with the case where the surface of the canvas is not coated with rubber, there are effects that the transferability is remarkably improved, such as the image of the mark becomes clearer.

Next, a noise test when the transmission belt obtained in the above-mentioned manufacturing example is actually used by being mounted on the back will be described. First, noise measurement was performed on the belt (invention example) obtained in the above-described production example by the test apparatus shown in FIG.
That is, the drive pulley 7 (diameter 140 mm / 2000r
pm) and the driven pulley (diameter 55 mm) between the belt 9
And a constant tension (To = 55 Kgf) was applied by a tension pulley 10 (diameter 85 mm) which was used as a back surface. Then, the belt was run at room temperature, and the noise level was measured by disposing the microphone 12 of the sound level meter 11 in the vicinity of the tension pulley 10 mounted on the back surface.
A belt having a mark printed on the back surface of the belt body using the conventional mark transfer material shown in FIG. 7 (conventional example),
The same test was performed on a belt (comparative example) in which the mark was printed on the back surface of the belt body using the mark transfer material shown in FIG.

The results of the above noise test are shown in FIG. 5, and it can be seen that the belt according to the present invention has a much lower noise level than the belts according to the conventional example and the comparative example. Therefore, there is an effect that it is particularly suitable for use in an engine room of a high-class vehicle where low noise such as quietness is required.

[0026]

As described above, in the invention of claim 1, the transfer area surface of the mark formed on the back surface of the belt main body of the transmission belt is the other area of the back surface of the belt main body excluding the transfer area surface. By being configured to be substantially flush,
There is no substantial step at the boundary between the mark transfer area surface and the rest of the belt body except the transfer area surface, which causes step interference with the tension pulley when using the back cover. There is an effect that the generation of abnormal noise during belt transmission can be significantly reduced.

According to the second aspect of the present invention, the belt main body is usually formed by applying pressure or pressure to the mark transfer material to the back surface of the belt main body of the belt before vulcanization and heating to such an extent that vulcanization does not proceed. The mark was transferred to a predetermined position on the back surface, and then the belt was normally vulcanized. As a result, during transfer, the mark can be transferred without softening the back surface of the belt body and the rubber inside it, and the transfer area surface of the mark is not dented by the softening of the rubber, so a step is formed on the transfer area surface. It will not be done.

On the other hand, according to the third aspect of the present invention, the mark transfer material is pressed and heated for a short time to the back surface of the belt main body of the belt after the normal vulcanization so that the mark transfer material is moved to a predetermined position on the back surface of the belt main body. The mark is transferred. That is, since the belt at the time of transfer is already normally vulcanized,
Since the belt is in the cured state even when transfer is performed by applying pressure and heat to the mark transfer material for a short time, the surface of the transfer area of the mark is not dented and the step portion is not formed. Thus, according to the invention of claim 2 or 3, the marks are not transferred at the same time when the belt is vulcanized, but the marks are transferred under a specific condition before or after the vulcanization of the belt. As a result, there is an effect that the step portion is not formed on the back surface of the belt main body, and the transmission belt that can significantly reduce the generation of the abnormal noise when the back cover is used is obtained.

Further, in the invention of claim 4, when the back surface of the belt is made of canvas, the surface of the canvas is previously covered with rubber to eliminate the unevenness of the surface of the canvas before transfer. As a result, the texture of the canvas is filled with the rubber, and a thin rubber coating layer is formed on the surface of the canvas. Therefore, in addition to the effect that the surface of the canvas is a smooth surface with no unevenness and no step is formed, there is an effect that a clearer transfer such as the sharpness of the mark image can be achieved.

[Brief description of drawings]

FIG. 1 is a perspective view of a transmission belt according to an embodiment of the present invention.

FIG. 2 is a front view of a transfer device for transferring a mark on the back surface of the transmission belt.

FIG. 3 is a side view of a transfer device for transferring marks on the back surface of the transmission belt.

FIG. 4 is a schematic diagram of a test apparatus for performing a noise test.

FIG. 5 is a diagram showing noise measurement results.

FIG. 6 is an explanatory diagram showing a procedure of a mark printing method.

FIG. 7 is a plan view of a conventional mark transfer material.

FIG. 8 is a sectional view of a conventional mark transfer material.

FIG. 9 is a perspective view of a belt on which a mark is printed by a conventional mark transfer material.

FIG. 10 is a side view showing a state in which a belt having a step portion on the back surface of the belt is hung on the back surface of the tension roller.

FIG. 11 is a plan view of another conventional mark transfer material.

FIG. 12 is a cross-sectional view of another conventional mark transfer material.

FIG. 13 is a plan view of another conventional mark transfer material.

[Explanation of symbols]

 1 Belt e1 Belt back side e2 Mark transfer area d Mark

Claims (4)

[Claims] 1. A transmission belt having a mark transferred to the back surface of the belt main body, wherein a transfer area surface of the mark is formed to be substantially flush with other parts of the back surface of the belt main body excluding the transfer area surface. Transmission belt featuring. 2. A method of manufacturing a power transmission belt for transferring a mark to a back surface of a belt body, comprising: a transfer material mounting step of mounting a mark transfer material at a predetermined position on the back surface of the belt body before vulcanization; A transfer step of applying pressure or pressure and heating to such an extent that vulcanization does not proceed to the mark transfer material, and after passing through the transfer step, the mark transfer material is peeled from the back surface of the belt main body and the belt is normally applied. And a vulcanizing step of vulcanizing. 3. A transfer belt manufacturing method for transferring a mark to a back surface of a belt main body, comprising: a transfer mounting step of mounting a mark transfer material at a predetermined position on the back surface of the belt main body after vulcanization; A transmission characterized by comprising a transfer step of applying pressure and heat to the mark transfer material for a short time, and a transfer material peeling step of peeling the mark transfer material from the back surface of the belt body after the transfer step. Belt manufacturing method. 4. When the back surface of the belt main body is made of canvas, before the transfer of the mark by the mark transfer material to the surface of the canvas, the surface of the canvas is previously covered with rubber so that the surface of the canvas is uneven. The manufacturing method of the transmission belt according to claim 2 or 3, characterized in that.