JPH10205584A - Toothed belt and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce noises of a toothed belt when running without marring the durability of the toothed belt. SOLUTION: For a toothed belt, a tooth cloth 2 is a wooven cloth and yarns 2b extended to the longitudinal direction of the belt is hard twist yarns. In the tooth cloth 2, the hard twist yarns 2b on the surface of the tooth cloth, crossing the yarns 2a extended to the cross direction of the belt and developing thereon, are fastened parts 8 and the hard twist yarns 2b on the back of the tooth cloth, crossing the yarns 2a extended to the cross direction of the belt and entering thereunder, are swollen parts 9. As the fastened parts 8 of the hard twist yarns 2b are arranged on the surface of the tooth cloth, a contact area between the tooth cloth 2 and a pulley is narrower, a frictional coefficient therebetween is smaller and less belt noise occurs during running.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a toothed belt used as, for example, a timing belt of an automobile engine and a method of manufacturing the same, and more particularly, to an improvement in a tooth cloth for covering a tooth surface of a belt body. It is.

[0002]

2. Description of the Related Art In recent years, the temperature in an engine room of an automobile tends to increase as the engine output increases. Toothed belts used as timing belts for such engines are required to withstand large loads and severe temperature conditions. Therefore, from the viewpoint of improving the heat resistance of the belt, instead of the conventional chloroprene rubber (CR), a hydrogenated nitrile rubber (H-
NBR), and the core wire is also improved from the viewpoint of improving the bending fatigue resistance.

On the other hand, for tooth cloth, aramid fiber having excellent heat resistance is used (Japanese Patent Laid-Open No. 4-8948).
Use of a fiber having excellent heat resistance as a covering yarn has been proposed (Japanese Patent Application Laid-Open No. 64-83952). However, the cost of the aramid fiber is 5 to 10 times that of the nylon itself, and the adhesion to rubber is not so good, so that the processing of the fiber becomes complicated and the processing cost becomes considerably high. This makes the belt expensive.

[0004]

On the other hand, the inventor of the present invention has proposed a method of properly using a conventionally used nylon fiber for a tooth cloth in order to improve the configuration and the number of twists of a wooly yarn made of nylon 6,6. And the amount of impregnation of the rubber adhesive was optimized.

[0005] That is, a tooth cloth is woven using a strongly twisted yarn formed by Z-twisting three wooly processed yarns as a yarn extending in the belt length direction, and the strong twisted yarn intersects with the yarn extending in the belt width direction and intersects the yarn. The part on the back side of the tooth cloth that has entered is tightened,
It is assumed that the portion on the tooth cloth surface side crossing the yarn extending in the belt width direction and bulging thereover is swelled, and the rubber-based adhesive attached to the back side of the tooth cloth is The bulging part was partially impregnated. The thickness of the woolly yarn is 2
10 deniers, the number of twists per meter of strong twisted yarn is 260
~ 320, and the woven texture of the tooth cloth is 2 /
Two twill weaves (Japanese Patent Application No. 7-185197).

In this toothed belt, the tooth cloth itself has a large amount of voids in the swollen portion of the strong twist yarn on the surface side, so that a large amount of a rubber-based adhesive is impregnated, thereby improving heat resistance and abrasion resistance and improving the belt life. Is improved. Moreover, the cost of the tooth cloth occupying the entire belt does not increase. However, sufficient effects have not been obtained in terms of reducing noise during belt running.

An object of the present invention is to reduce belt noise without increasing the manufacturing cost of a toothed belt and without impairing the life of the belt.

[0008]

The inventor of the present invention made a prototype of a toothed belt by changing the structure of the tooth cloth in various ways, and conducted a running test to investigate the cause of the noise. It has been clarified that the swelling portion of the high twist yarn is impregnated with a large amount of the rubber-based adhesive and the friction coefficient on the surface side of the tooth cloth is increased.

That is, in the woven fabric, unevenness is formed on the surface due to a weave structure in which the weft intersects the warp and emerges above the warp and "sinks" below the warp. Affects the coefficient of friction. In the case of the above-mentioned tooth cloth, the bulging portion of the strong twist yarn forms a “float” to become a convex portion, and the bulging portion is impregnated with a large amount of a rubber-based adhesive, so that the area of the convex portion on the tooth cloth surface is large. That is, the contact area between the tooth cloth and the pulley is increased, and the friction coefficient is increased. According to experiments, it has been confirmed that there is a correlation between the friction coefficient and the noise, and that as the friction coefficient of the tooth cloth increases, the noise of the belt increases.

Accordingly, in the present invention, the tightening portion of the strong twist yarn is formed on the surface side of the tooth cloth, and the area of the convex portion on the surface side of the tooth cloth is reduced, thereby lowering the friction coefficient. This is a solution to the above noise problem. Hereinafter, this point will be specifically described.

(Toothed belt) The invention of this application relates to a toothed belt in which a tooth cloth is adhered to a tooth surface of a belt body with a rubber-based adhesive, wherein the tooth cloth is formed of a woven cloth; The yarn arranged to extend in the belt length direction of the tooth cloth is constituted by a strong twist yarn obtained by strongly twisting a plurality of aligned woolly yarns, and the strong twist yarn extends in the belt width direction. It is characterized in that the portion on the front side of the tooth cloth crossed over the yarn and tightened thereon is tightened, and the portion on the back side of the tooth cloth crossed below the yarn extending in the width direction of the belt and bulging.

In the case of the present invention, since the tightening portion of the strong twist yarn is arranged on the surface side of the tooth cloth and the contact area between the tooth cloth and the pulley is narrowed, the friction coefficient is lowered and the belt is running during running. Noise is reduced. On the other hand, the strong twist yarn extends in the belt length direction, and the strong twist increases the bending fatigue resistance and wear resistance of the tooth cloth. Therefore, the durability of the belt can be obtained without using expensive yarn such as aramid fiber. Further, since the strong twisted yarn is swelled on the back side of the tooth cloth, the swelled portion is impregnated with a large amount of a rubber-based adhesive, and the adhesive strength between the tooth cloth and the belt body is increased.

When a part of the rubber-based adhesive is impregnated into the tightened portion of the strong twist yarn on the surface of the tooth cloth, the heat resistance and the wear resistance of the tooth cloth are thereby improved.

Regarding the woven structure of the above-mentioned tooth cloth,
/ 2 twill weave, the tightening portion of each strong twisted yarn extends on the surface of the tooth cloth in an oblique direction with respect to the belt length direction, and a narrow ridge extending in the oblique direction is formed. Will be.

If the wooly yarn is formed of nylon fibers, it is advantageous in reducing the cost of the tooth cloth.

(Relationship between the twisting direction of the wooly processed yarn and the twisting direction of the strong twisted yarn, etc.)
It is preferable that the twisting direction of the strong twisted yarn obtained by twisting three woolly yarns is the same.

That is, if the twisting direction of the wooly processed yarn is set to the S direction and the twisting direction of the strong twisted yarn is set to the Z direction, if the combination of S twisting and Z twisting is performed, the obtained strong twisted yarn will The twist and the twist in the Z direction mesh with each other, so that the wooly yarn does not tighten, and the strongly twisted yarn itself has a bulged appearance. When a woven fabric is woven using such a strong twist yarn, the strong twist yarn swells on the front surface side of the woven fabric and finishes as a tightly woven fabric on the back surface side. Therefore, if this is used as it is as the tooth cloth, the expected reduction in the friction coefficient due to the swelling on the surface side cannot be achieved.

It is conceivable to use such a woven fabric upside down, but since the original strong twisted yarn itself has a swelling as described above, the strength of the woven fabric obtained on the back side is reduced. The tightening of the twisted yarn also becomes weak, and it is difficult to enhance the effect of reducing the friction coefficient.

On the other hand, when the twisting direction of the wooly-processed yarn and the twisting direction of the strong twisting yarn are made the same, that is, a combination of Z twisting / Z twisting or a combination of S twisting / S twisting, The tightening is added to the wooly processed yarn, and the resulting strongly twisted yarn has a strong tightening of the yarn itself. Therefore, in the woven fabric formed using this, the tightness of the strong twist yarn on one side is increased, which is advantageous in reducing the friction coefficient.

Preferably, the twist of the wooly yarn and the twist of the strong twist yarn are both Z twists. this is,
This is because tightening of the strong twist yarn is likely to occur on the front side of the obtained woven fabric.

The thickness of the three wooly yarns is 210 denier, and the number of twists per meter of the strong twist yarn is less than 260, preferably 190 to 210. . That is, when the twisting direction of the wooly processed yarn and the twisting direction of the strong twisted yarn are the same, the tightening of the strong twisted yarn itself obtained as described above becomes strong, which is the case where the thickness of the strong twisted yarn is small. Means that Therefore, the thickness of each of the three wooly yarns is 2
In the case of 10 denier, when the number of twists of the strong twist yarn is reversed in the above twist direction (S twist / Z twist)
If the number of twists is the same (e.g., 260 to 320 turns / m), the obtained strong twist yarn becomes too thin and the thickness of the woven fabric becomes thin, which is disadvantageous for tooth cloth.

Therefore, the number of twists of the strong twist yarn is set to 260 times /
m, preferably 190 to 210 times / m. In this case, if the number of twists is less than 190 turns / m,
Tightening of the strong twist yarn on the tooth cloth surface is weakened, which is disadvantageous in terms of bending fatigue resistance.

The Z twist / Z twist (or S twist) as described above
In the combination of twisted and S-twisted, even if the required thickness of the strongly twisted yarn is secured by reducing the number of twists of the strongly twisted yarn (that is, the same thickness as that of the combination of S-twisted and Z-twisted) As described above, since the tightening is applied to the wooly yarn itself as described above, the tightening of the strongly twisted yarn on the surface of the obtained woven fabric is stronger than that in the case of the combination of the S twist and the Z twist. 19 twists
There is no particular problem in reducing the number to about 0 times / m.

(Regarding a method of manufacturing a toothed belt) Another invention of this application is a method of manufacturing a toothed belt,
After obtaining a strongly twisted yarn by aligning a plurality of wooly processed yarns and twisting them in the Z direction, the above-described strongly twisted yarn is used as a weft yarn.
The weft thread that crosses the warp and comes out above it tightens,
Weaving a woven fabric in which the weft thread portion crossing the warp yarn and entering the lower side is swelled, a rubber-based adhesive is attached to the surface of the woven fabric on the swelled side, and a part of the rubber-based adhesive So as to impregnate the tightening side portion of the weft yarn, the woven fabric is arranged such that the strong twist yarn extends in the belt length direction,
The surface of the woven fabric to which the rubber-based adhesive has adhered is adhered to the rubber forming the tooth surface of the belt body.

As a result, a toothed belt having a low friction coefficient as described above can be obtained, which is advantageous for reducing the running noise of the belt.

[0026]

According to the invention of the toothed belt of this application, a yarn arranged to extend in the belt length direction of the tooth cloth is formed by strongly twisting a plurality of aligned wooly processed yarns. And a portion of the strong twisted yarn that comes out above the yarn extending in the belt width direction and is arranged on the surface side of the tooth cloth is tightened, enters under the yarn extending in the belt width direction, and enters the belt main body. Because the part arranged on the back side of the tooth cloth adhered to the swelling is bulged, the contact between the tooth cloth and the pulley is maintained without reducing the durability of the toothed belt while suppressing the increase in manufacturing cost. This is advantageous in that the area is narrowed and the coefficient of friction between the two is reduced to reduce noise during belt running.

If a part of the rubber-based adhesive is impregnated into the tightened portion of the strong twist yarn on the surface of the tooth cloth, it is advantageous in improving heat resistance and wear resistance of the tooth cloth.

Regarding the woven structure of the above-mentioned tooth cloth, this is referred to as 2
By using a / 2 twill weave, a narrow ridge extending in an oblique direction can be formed, and the friction coefficient of the tooth cloth can be reduced.

If the wooly yarn is formed from nylon fibers, it is advantageous for reducing the cost of the tooth cloth.

When the twisting direction of the wooly processed yarn is the same as the twisting direction of the strong twisted yarn obtained by twisting three wooly processed yarns, the wooly processed yarn is tightened, and the strong twisted yarn on the surface of the tooth cloth is added. This is advantageous in reducing the noise by strengthening the tightening of.

The twist of each of the three wooly yarns and the twist of the strong twist yarn are both Z twists, the thickness of each of the three wooly yarns is 210 denier, and the per-m According to the twisting number set in the range of 190 to 210 times, the above-described noise reduction effect can be obtained while the thickness of the tooth cloth is made appropriate.

According to the invention relating to a method for manufacturing a toothed belt, a plurality of wooly processed yarns are aligned and twisted in the Z direction to obtain a strongly twisted yarn, which is used as a weft yarn.
The weft portion that emerges above the warp yarn is tightened, the weft portion that sinks below the warp yarn is woven into a swollen woven fabric, and a rubber adhesive is attached to the surface of the woven fabric where the weft yarn is swollen, and A part of the rubber-based adhesive is impregnated into a portion on the tightening side of the weft yarn, and the woven fabric is arranged so that the strong twist yarn extends in the belt length direction. Since the coated surface is bonded to the rubber forming the tooth surface of the belt body, a toothed belt having a low friction coefficient as described above can be obtained, which is advantageous in reducing the running noise of the belt.

[0033]

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

FIG. 1 shows a toothed belt according to an embodiment of the present invention. The toothed belt is bonded to a belt body 1 made of a rubber-like elastic material such as hydrogenated acrylonitrile-butadiene copolymer rubber (H-NBR), and to the belt body 1 via a glue rubber as a rubber-based adhesive. Tooth cloth 2 provided.

The belt main body 1 is connected to a core wire (tensile body) 5 extending in the belt length direction and spirally provided at a predetermined pitch in the belt width direction and the core wire 5 to the outer peripheral side of the belt. A back rubber 3 and a number of tooth rubbers 4, 4,... Arranged at a predetermined pitch in the belt length direction and connected to the inner peripheral side of the core wire 5 on the belt. The tooth cloth 2 is adhered to the tooth surface (the tooth rubber surface and the tooth bottom) of the belt main body 1.

The tooth cloth 2 is obtained by applying a 2/2 twill cloth woven by a warp yarn 2a and a weft yarn 2b, and the warp yarn 2a extends in the belt width direction and the weft yarn 2a.
b is arranged to extend in the belt length direction. After being immersed in the RFL liquid, the above-mentioned glue rubber is adhered to the tooth cloth 2, and is bonded by integrally vulcanizing the glue rubber to the belt main body 1 during belt forming.

The weft yarn 2b of the tooth cloth 2 is formed of a strong twisted yarn formed by aligning three wooly processed yarns 7, 7,... Twisted in the Z direction and strongly twisting in the Z direction. The high twist yarn 2b intersects with the warp yarn 2a extending in the belt width direction and comes out of the warp yarn 2a, and a portion arranged on the surface side of the tooth cloth is tightened (tightening portion 8). The portion arranged on the side (the side adhered to the belt main body 1) is bulging (bulging portion 9).

Since the tooth cloth 2 is a twill woven cloth, a narrow ridge extending obliquely with respect to the belt length direction is formed on the surface side of the tooth cloth 2 by a series of convex portions formed by the tightening portions 8 of the strong twisted yarn 2b. On the back surface side, a thick ridge extending obliquely with respect to the belt length direction by connecting the convex portions formed by the bulging portion 9 of the strong twist yarn 2b appears. The ridges intersect with the above-described spirally extending core wire 5.

As shown schematically in an enlarged sectional view of FIG. 2, the tooth cloth 2 has the wooly thread 7, 7 on the side opposite to the surface to be bonded to the belt body 1, that is, on the tooth cloth surface.
Each of the tightening portions 8 is impregnated with a portion of the adhesive rubber that has oozed out on the surface of the tooth cloth 2.

Specifically, each of the woolly yarns 7 is
It is made of nylon 6,6 and has a thickness of 210 denier. The number of twists per meter of the strong twist yarn 2b is set in the range of 190 to 210.

Next, a method of manufacturing the toothed belt will be described. First, a plurality of wooly processed yarns 7, 7,... Are aligned and strongly twisted in the Z direction to obtain a strongly twisted yarn. Thereafter, the strong twist yarn is used as the weft yarn 2b, and the warp yarn 2a made of nylon 6,6 filaments is combined with the weft yarn 2b. Weave the swelled 2/2 twill woven fabric.

Glue rubber is adhered to the surface (back surface) of the woven fabric 2b on which the bulging portion 9 of the weft yarn 2b is formed, and a part of the glue rubber is impregnated in the tightening portion 9 of the weft yarn 2b.

The woven fabric is arranged so that the weft yarn 2b extends in the belt length direction, and the surface of the woven fabric to which the adhesive rubber is adhered is adhered to the rubber forming the tooth surface of the belt body 1.

That is, the weft (strongly twisted yarn) 2b extends in the circumferential direction from the glued woven fabric to a cylindrical mold having a tooth mold for forming the teeth of the toothed belt formed on the outer peripheral surface. The core wire 5 is spirally wound at a predetermined pitch from above, and an unvulcanized rubber sheet is further wound thereon. Then, the unvulcanized rubber sheet is vulcanized by heating and pressing from the surroundings. At this time, a part of the unvulcanized rubber sheet is pushed together with the woven cloth into the concave portion of the tooth form through the gap between the spiral cores to form the tooth rubber 4 of the toothed belt, and the woven cloth is The cloth 2 is vulcanized and bonded to the tooth rubber 4.

The obtained cylindrical molded body is removed from the mold,
A toothed belt is obtained by slicing.

Since the above-mentioned toothed belt uses a strongly twisted yarn for the yarn in the belt length direction, the tooth cloth 2 is only as much as the strongly twisted yarn.
Can have improved bending fatigue resistance and wear resistance. Therefore, the bending fatigue resistance at the root of the toothed belt and the wear resistance at the portion from the tooth bottom to the root are improved.
Therefore, even under severe temperature conditions, it is possible to prevent the toothed belt from chipping without using an expensive material such as aramid fiber.

Since the strong twisted yarn has the tightening portion 8 on the surface side of the tooth cloth 2, the contact area with the pulley is reduced. For this reason, the toothed belt has a low coefficient of friction between the pulley and the pulley, so that noise during traveling is reduced.

<Evaluation Test> The friction coefficient, running noise and load life of the toothed belt according to the present invention were evaluated by comparing the examples with comparative examples.

The examples and comparative examples are the same except for the structure of the tooth cloth, as shown in Table 1. In the same table, lower twist means twisting of the above-mentioned wooly yarn made of nylon 6,6, and upper twisting means twisting of strongly twisted yarn. The number of twists is the number of twists. Density refers to woven fabric. The belt body rubber is hydrogenated acrylonitrile-butadiene copolymer rubber, and the yarn extending in the belt width direction is a nylon 6,6 filament. Regarding the shape and size of the toothed belt, the belt width was 10 mm, the belt length was 1280 mm, and the pitch between the tooth portions was 8 mm.

[0050]

[Table 1]

-Friction Coefficient- The friction coefficient was measured by preparing test pieces (adhesion of tooth cloth pieces to rubber pieces) corresponding to each of the examples and comparative examples, and as shown in FIG. The test piece 11 was brought into contact with a metal disk 12 of the same material as the pulley, and the disk 12 was rotated to make the test piece 11 slide. The contact pressure of the test piece 11 is 313.8 KPa,
The relative speed of the test piece 11 was 0.15 m / s, and the ambient temperature was 100 ° C.

The results are shown in FIG. According to this, each of Examples 1 to 4 has a lower coefficient of friction than the comparative example. This is considered to be because in each of the examples, the twisting direction of the wooly yarn and the twisting direction of the strongly twisted yarn were the same, and the tightness of the strongly twisted yarn was increased.

In Example 1, since the number of twists of the strongly twisted yarn is the same as that of the comparative example, the thickness of the strongly twisted yarn is smaller than those of the other examples. For this reason, in Example 1, it is considered that the tightening portion 8 of the strong twist yarn on the surface of the tooth cloth also has a small volume, the contact area with the disk 12 is small, and the friction coefficient is the lowest.

In Example 2, the number of twists of the high-twisted yarn was reduced as compared with Example 1, and the density of the warp yarn (yarn extending in the belt width direction) of the tooth cloth was increased. Example 3 was different from Example 2. In Example 4, the density of the high twist yarn (weft yarn) was increased, and in Example 4, the combination of S twist and S twist was used, whereas the other examples were combinations of Z twist and Z twist. There is no significant difference in the coefficient of friction.

Therefore, if the twisting direction of the wooly yarn is the same as the twisting direction of the strong twisted yarn, the same effect can be obtained regardless of whether the twisting direction is Z-twisting or S-twisting. It is understood that the yarn density does not significantly affect the coefficient of friction.

-Noise Level- In FIG. 5, the test belt 15 is wound around the driving pulley 13 and the driven pulley 14, and the load SW (3
0kgf) and rotate at 5000rpm,
The noise level was measured with the microphone 16 separated from the driven pulley 14 by 10 cm. Each of the pulleys 13 and 14 has 24 teeth.

The results are shown in FIG. The noise level of each of the example and the comparative example is the coefficient of friction (see FIG. 4).
It can be seen that the reduction in the coefficient of friction is effective in reducing the noise.

-Load Life- The running life at a predetermined load torque was measured for each of the belts of Examples 1 and 3 and Comparative Example. That is, FIG.
As shown in the figure, a drive pulley 17 having 42 teeth, a driven pulley 18 having 21 teeth, and a pulley diameter of 52 mm
And the driven pulley 18 is loaded with a load SW in a direction away from the drive pulley 17 by using an idle pulley 19 which is
(44 kgf), the drive pulley 17
Was rotated at a speed of 6000 rpm. Then, the running life of the belt when the load torque was 3.0 kgfm was measured.

The results are shown in FIG. According to this, Example 1 has a slightly shorter load life than the comparative example, but Example 3 has a slightly longer load life than the comparative example. The reason why the load life of Example 1 was shorter than that of Comparative Example is that the strong twisted yarn was a combination of Z twist and Z twist and was thin, and thus the thickness of the tooth cloth was slightly reduced. However, the degree of the decrease is small. On the other hand, in the case of Example 3, although the strong twist yarn is a combination of Z twist and Z twist, the yarn is thinner, but the yarn density is higher than that of the comparative example and the tooth cloth has a thickness comparable to that of the comparative example. It is considered that the load life was prolonged because of the above.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a part of a toothed belt.

FIG. 2 is a sectional view of a tooth cloth.

FIG. 3 is a perspective view showing a mode of measuring a coefficient of friction.

FIG. 4 is a graph showing friction coefficients of an example and a comparative example.

FIG. 5 is a diagram showing a mode for measuring the running noise of the belt.

FIG. 6 is a graph showing running noises of the belts of the example and the comparative example.

FIG. 7 is a side view showing a mode for measuring the load life of the belt.

FIG. 8 is a graph showing the load life of the belts of Examples and Comparative Examples.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Belt main body 2 Tooth cloth 2a Warp yarn (yarn in belt width direction) 2b Weft yarn (strong twist yarn in belt length direction) 3 Back rubber 4 Tooth rubber 5 Core wire 7 Woolie processing thread 8 Tightening portion 9 Swelling portion

Claims (7)

[Claims] 1. A toothed belt in which a tooth cloth is bonded to a tooth surface of a belt body with a rubber adhesive, wherein the tooth cloth is formed of a woven cloth and extends in a belt length direction of the tooth cloth. The yarn arranged in such a manner is constituted by a strong twisted yarn obtained by strongly twisting a plurality of aligned wooly processed yarns, and the strong twisted yarn intersects with the yarn extending in the belt width direction and emerges therefrom. A toothed belt characterized in that a part on the front side of the tooth cloth is tightened, and a part on the back side of the tooth cloth which intersects a yarn extending in the belt width direction and bulges therebelow. 2. The toothed belt according to claim 1, wherein a part of the rubber-based adhesive is impregnated in a tightening portion of the strong twist yarn on the surface of the tooth cloth. belt. 3. The toothed belt according to claim 1, wherein the woven structure of the tooth cloth is a 2/2 twill weave. 4. The toothed belt according to claim 1, wherein the woolly yarn is formed of nylon fibers. 5. The toothed belt according to claim 4, wherein a twisting direction of the wooly processed yarn is the same as a twisting direction of the strongly twisted yarn obtained by twisting three woolly processed yarns. A toothed belt characterized by the following. 6. The toothed belt according to claim 5, wherein the twist of each of the three wooly yarns and the twist of the strong twist yarn are both Z twists. A toothed belt, wherein each of the thicknesses is 210 denier, and the number of twists per meter of the high twist yarn is set in a range of 190 to 210 times. 7. A method in which a plurality of woolly yarns are aligned and Z
After obtaining a strong twist yarn by twisting in the direction, the above-mentioned strong twist yarn is used as a weft yarn, and the weft yarn portion crossing the warp yarn and coming out above is tightened, and the weft yarn portion crossing the warp yarn and entering the lower side expands. Weaving a weft fabric, attaching a rubber-based adhesive to the surface of the woven fabric on the side where the weft is swollen, and impregnating a part of the rubber-based adhesive into a portion of the weft tightening side; The cloth is arranged so that the strong twist yarn extends in the belt length direction, and the surface of the woven cloth to which the rubber-based adhesive is adhered is bonded to the rubber forming the tooth surface of the belt body. Manufacturing method of toothed belt.