JP2000304104A - Transmission belt with cog and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent development of a crack in a cushion layer by forming a cushion layer having a cog with an inner peripheral surface protected by woven fabric at the inside of a tensile force layer having an outside protective layer on its back face and setting a weave texture angle of woven fabric in a cog groove part so as to be larger than that in a crest part. SOLUTION: In a transmission belt 1 with cog constituted by forming a cushion layer 18 having a cog 2 with an inner peripheral surface protected by woven fabric 3 at the inside of a tensile force layer 4 having an outside protective layer 5 on its back face, a weave texture angle β of woven fabric in a cog groove part 8 of the cog 2 is molded so as to be larger than a weave texture angle αof woven fabric of a crest part 7. Namely, the weave texture angle α of woven fabric of the crest part 7 is set 80 deg. to 130 deg. and the weave texture angle β of woven fabric in the cog groove part 8 is formed so as to be larger than a folding angle α of the crest part 7 by 7 deg. to 30 deg.. As the woven fabric 3 to be used as a protective layer of the cushion layer 18, cotton, nylon and polyester are used, and the woven fabric 3 cut bias is joined long.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission belt with cogs used as a fan belt of an automobile and a method of manufacturing the same. As shown in a partially enlarged perspective view (partial cross section) of FIG.
In the inside of the tension layer 4 having the outer protective layer 5 on the upper surface)
The cushion layer 18 having the cogs 2 whose inner peripheral surface (the lower side surface in FIG. 7) is protected by the woven fabric 3 is formed. The transmission belt with cogs is formed in a ring shape, is suspended and rotated between a plurality of pulleys, and the side surface of the cushion layer 18 is brought into contact with the pulleys to transmit power between the pulleys by the tension layer 4. Further, a back pulley may be used to adjust the tension of the belt or to rotate other auxiliary machines.
The transmission belt with cogs according to the present invention is suitably used when the rear pulley is used.

[0002]

2. Description of the Related Art A transmission belt with a cog is used as a protective layer for a cushion layer, which is formed by cutting a woven fabric into biases and connecting them in a long length. FIG. 5 shows a state in which a part of the conventional transmission belt 1 with cogs is not bent.
FIG. 5A is a plan view, and FIG. 5B is a side view. The conventional cogged transmission belt 1 is designed such that the texture angle α ′ of the crest 7 of the cog 2 and the texture angle β ′ of the cog groove 8 are substantially the same. The weave angle refers to the crossing angle of the warp and weft yarns of the woven cloth cut into bias, and the warp and weft yarns are almost the same angle to the length direction of the belt (for example, 45 °, and in this case, the weave angle is 90 °). °) is designed to tilt. Cushion layer 1
When the fabric 8 is compressed or expanded, the weave angle (α ′, β ′) is changed to change the length of the woven fabric, so that a large tension is not applied to the woven yarn and breakage is prevented.

The following method is used as a method for manufacturing such a conventional transmission belt 1 with cogs. First, as shown in a partial side view in FIG. 6, a molding groove 19 corresponding to the cog of the transmission belt with cogs is formed on the surface (upper surface) of the flat embossing die 10, and is formed along the molding groove 19. In addition, the woven fabric 3 serving as a protective layer of the cushion layer
The unvulcanized cushion rubber 6 in the form of a sheet is pressed thereon by the pressurizing plate 11 to be pressed into the groove 19 for molding.
Is molded. The woven fabric 3 is strongly adhered to the unvulcanized cog portion 21 of the cushion layer 23 with the unvulcanized cog, and by adjusting the amount (sheet thickness) of the unvulcanized cushion rubber 6, the uncured cushion rubber 6 The thickness of the vulcanized cushion rubber layer 22 is adjusted. Subsequently, in a vulcanization step (not shown), the unvulcanized cog-cushioned cushion layer 23 is vulcanized in a cylindrical inner mold having a vulcanization groove corresponding to the cog shape of the cogged transmission belt on the outer peripheral surface. It is wound while fitting the groove for use and the unvulcanized cog part 21. The vulcanizing groove is formed along the length direction of the cylindrical inner mold, and the cross section of the vulcanizing groove has a shape corresponding to the cross section of the cog after vulcanization. After forming an unvulcanized cog transmission belt by winding an unvulcanized tension layer and an outer protective layer in this order on the outer peripheral surface of the unvulcanized cog cushion layer wound around the cylindrical inner mold. A rubber sleeve having a smooth inner surface is covered on the outside of the unvulcanized cog transmission belt, and the entire unvulcanized cog transmission belt is heated and vulcanized while being pressurized from the outside of the rubber sleeve. Finished transmission belt with cogs.

[0004]

However, in the above-described transmission belt with cogs, the woven fabric for protecting the cushion layer is designed so that the top of the cogs and the cog grooves have the same weave angle. So, when the transmission belt with cogs is bent in the direction to compress the cushion layer,
That is, when the woven fabric is suspended between the ordinary pulleys, a compressive force is applied to the woven fabric, and fatigue is small. However, if the back pulley is further used to bend inwardly convexly, extension and compression are repeated in the cog groove portion, and the woven yarn in the cog groove portion may be strongly expanded and contracted and broken.

[0005] As shown in FIG.
The cushion layer 18 is compressed when it is rotated around a plurality of pulleys (the driving pulley 13, the driven pulley 14, etc.) and is bent with a small radius along the pulleys 13, 14. In the straight traveling portion, the cushion layer 18 is slightly stretched, and the cushion layer 18 is repeatedly compressed and stretched.
Further, the rear pulley 12 may be used to adjust the tension of the pulleys 13 and 14 or to rotate the auxiliary device. And the cushion layer 18 is often stretched. When the transmission belt 1 with cogs is bent inwardly convexly, the cushion layer 18 originally designed to withstand compression is basically used.
The woven fabric 3 used as a protective layer of the cushion layer 18 may be stretched and, in particular, the woven yarn of the woven fabric in the cog groove portion may be broken at an early stage by applying a large tension to the woven yarn, as described later in detail. When the woven yarn is broken, cracks develop in the cushion layer 18 and shorten the life of the entire cog transmission belt 1.

The state of expansion and contraction of the cushion layer will be described with reference to FIG. FIG. 4A is a partial side view when the cog transmission belt 1 is running in a straight line, and FIG. 4B is a case where the cog side of the belt is bent by the rear pulley 12 so that the cog side of the belt becomes convex (FIG. 3). (See FIG. 2). The degree of curvature γ ′ of the cog groove 8 when the cog side is bent to be convex is greater than the degree of curvature γ of the cog groove 8 during straight running. That is, at the position where the back pulley 12 is used, the woven fabric 3 in the cog groove portion 8 is stretched, and at the positions of the pulleys 13 and 14, it is compressed, thereby promoting the fatigue and breakage of the woven yarn.

[0007] The crest 7 and the cog groove 8 are not stretched.
The degree of compression is different. The mountaintop 7 is less likely to be restricted from outside during both straight running as shown in FIG. 4A and when bending inward as shown in FIG.
Further, since the cushion layer is a rubber having elasticity and is deformed, expansion and compression of the woven fabric 3 can be minimized. However, as shown in FIG. 4B, when the back pulley 12 is used, the cog groove 8 is strongly stretched, and the cog groove 8 is used.
Since a strong tension is applied to the woven fabric 3 serving as the protective layer, the woven yarn of the cog groove 8 is more easily broken than the woven yarn of the crest 7.

In the method of manufacturing a cushion layer with an uncured cog, a method of uniformly adhering a woven cloth to a flat embossing die and then press-fitting the uncured cushion rubber is used. As described above, the weave angle of the transmission belt is almost the same at the peak and the cog groove, and when using the above-described back pulley, the woven fabric of the cog groove is stretched greatly and a large tension is applied compared to the peak. As a result, the yarn is easily broken. The present invention relates to a long-life cog transmission belt having a protective layer made of a woven fabric that is resistant to stretching in order to prevent cracks in a cushion layer of a cog transmission belt repeatedly bent inward and outward, and a method of manufacturing the same. The purpose is to provide.

[0009]

In order to solve the above-mentioned problems, a cogged power transmission belt according to claim 1 has an inner peripheral surface protected by a woven fabric inside a tension layer having an outer protective layer on the back surface. A transmission belt with cogs forming a cushion layer having cogs, wherein a weave angle of the woven fabric in a cog groove portion is formed larger than a weave angle at a peak portion.

In a transmission belt with cogs (also referred to simply as a belt) used together with a back pulley, as described above, a woven fabric of a cog groove (referred to as a bottom portion between a cog and an adjacent cog) is provided with a woven fabric of a crest. Higher tension is applied compared to cloth. At the same time, strong compression is applied at the position of the driving pulley, so that the fatigue of the woven fabric is further increased. Therefore, even at the position where the back pulley is used, the weave angle of the cog groove is designed to be large from the beginning so that the weave angle of the cog groove approximates the weave angle of the peak. That is, the room is designed in advance so that it can withstand the elongation even when the weave angle becomes small at the time of elongation.

The cogged transmission belt according to claim 2 is
The weave angle of the woven fabric at the peak is 80 to 13
0 °.

When the woven cloth at the peak is hung on two pulleys, a force is applied to the compression side, and a woven yarn is also applied to the belt in the width direction of the belt, that is, in the direction to increase the weave angle. However, when a back pulley is used and the belt is curved convexly inward, the crest of this cog is stretched and a force is applied in a direction to reduce the weave angle. By designing the weave angle to be large when traveling in a straight line so that the weave angle approaches 90 ° when the cog peak is extended, the tension applied to the yarn is reduced. If the angle is less than 80 °, the yarn may be broken due to excessive tension applied to the yarn when the belt is suspended on the back pulley. If the angle exceeds 130 °, the bias cut woven fabric greatly expands with a slight tension, and uncured It becomes difficult to form the cog cushion layer (texture angle is not stable). The weave angle is measured with the belt stretched on a flat plane with the cog side facing upward.

The transmission belt with cogs according to claim 3 is
The weave angle of the woven fabric in the cog groove is 7 to 30 degrees larger than the weave angle of the crest.

When the belt is hung by a driving pulley or the like and bent inwardly concavely, the cog groove portion is strongly compressed as compared with the peak portion, and when the belt is bent inwardly convexly by the back pulley, the cog groove portion is bent. Is strongly stretched compared to the summit.
Since the cross-sectional shape of the cog is gradually narrowed toward the top of the peak, even if the cog is bent inwardly, the cogs do not come into contact with each other and the compression in the longitudinal direction of the belt is small. However, in the cog groove portion, there is no place for rubber to escape, and the rubber is strongly compressed. Conversely, when the belt is bent inwardly convexly, the crest is open and the rubber in the cog is compressed to reduce the tension applied to the woven fabric, but the woven fabric in the cog groove is reduced. The back is supported by the back pulley, so that there is no escape and it is strongly stretched. Therefore, by designing the weave angle of the cog groove portion to be larger than the weave angle of the crest portion, the tension applied to the yarn is reduced by changing the weave angle of the woven fabric even when the cog groove portion is extended.

The difference in expansion and contraction between the cog groove and the peak is
It depends on the height of the cog (difference between the bottom of the cog groove and the peak), the degree of curvature by the back pulley, and the outer diameter of the back pulley. Required by In a commonly used power transmission belt with cogs, it is preferable that the weave angle of the cog groove be 7 to 30 degrees larger than the weave angle of the peak. If the angle is less than 7 °, a large tension may be applied to the woven yarn in the cog groove portion, and the yarn may be broken.
In the step of compressing the woven fabric to the unvulcanized rubber plate described later, the weave angle of the bias cut woven fabric is liable to change, and the dispersion increases.

The transmission belt with cogs according to claim 4 is
The cushion layer is a fiber-containing rubber.

The fiber-containing rubber is kneaded with short fibers having a high affinity for rubber, and most of the short fibers are arranged with the length direction thereof oriented in the width direction of the transmission belt. As a result, the belt width can be maintained irrespective of the side pressure caused by the driving pulley or the like.

According to a fifth aspect of the present invention, a cushion layer having a cog whose inner peripheral surface is protected by a woven fabric is formed inside a tension layer having a protective layer on the back surface. A method of manufacturing a transmission belt with cogs,
An unvulcanized rubber plate having an unvulcanized cog portion is formed by press-fitting an unvulcanized cushion rubber into a flat embossing mold having a molding groove corresponding to the cog shape on the surface. Is wound around a rotatable forming roller having a predetermined outside diameter with the unvulcanized cog portion as the outside, and the woven cloth is attached to the cog groove of the unvulcanized rubber plate suspended by the forming roller. Then, a toothed roller having a tooth portion corresponding to the cog groove portion is pressed against the upper surface of the attached woven fabric, and the toothed roller and the molding are performed while supplying the woven fabric and the unvulcanized rubber plate. The rollers are rotated in synchronization, and the woven fabric is laminated on the entire length of the unvulcanized rubber plate to form a cushion layer with an unvulcanized cog. In a cylindrical mold having a vulcanizing groove, the unvulcanized cog The non-vulcanized cog is wound around the outer peripheral surface of the tension layer and the outer protective layer by winding the non-vulcanized cog around the outer peripheral surface of the unvulcanized cog. After forming the transmission belt with, after covering the unvulcanized cog transmission belt with a rubber sleeve having a smooth inner surface, while pressing from the outside of the rubber sleeve,
After heating and vulcanizing the entire unvulcanized transmission belt with cogs, it is removed from the mold and cut into a predetermined width to produce a transmission belt with cogs.

First, an unvulcanized rubber plate having a cog portion is formed by pressing an unvulcanized cushion rubber into a flat embossing die having a molding groove corresponding to the cog shape of a belt on the surface. (Woven cloth is not attached, also called rubber plate)
Is molded.

The unvulcanized rubber plate is suspended around a rotatable forming roller having a predetermined outer diameter with the unvulcanized cog portion as the outer side. The cog groove is extruded to extend. In this state,
A separately prepared woven cloth (biased) for protecting the inner peripheral surface of the cog is attached to the cog groove. A toothed roller having a tooth portion corresponding to the shape of the cog groove portion is brought into contact with the upper surface of the attached woven fabric, and a predetermined tension (including zero or a tension only by its own weight) is applied to the unvulcanized rubber plate. While supplying the woven fabric, the toothed roller and the forming roller are rotated in synchronization with each other, and the woven fabric is laminated on the entire length of the unvulcanized rubber plate to form a cushion layer with an unvulcanized cog. By pressing the woven fabric with a predetermined tension in a state where the cog groove portion is stretched, the cog groove portion shrinks when the cog transmission belt is straightened after vulcanization, and the weave angle of the laminated woven fabric is the cog angle of the cog. It is larger than the weave angle at the top of the mountain.

Using the unvulcanized cog cushion layer, a cog transmission belt is formed in the same manner as a conventional belt manufacturing method. That is, the uncured cog cushion layer is wound around a cylindrical mold having a vulcanizing groove corresponding to the cog formed on the outer peripheral surface while the vulcanizing groove and the uncured cog are fitted to each other. After wrapping the unvulcanized tension layer and the outer protective layer around the outer peripheral surface in this order to form a transmission belt with an unvulcanized cog, cover the unvulcanized cog transmission belt with a rubber sleeve having a smooth inner surface. Then, while pressurizing the outside of the rubber sleeve with high-pressure steam or the like, the entire unvulcanized cog transmission belt is heated and vulcanized, then demolded, and cut into a predetermined width to produce a cog transmission belt.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of a transmission belt with cogs and a method of manufacturing the same according to the present invention will be described with reference to the drawings. FIG. 1A is a partial plan view of the transmission belt with cogs according to the present invention, FIG. 1B is a side view thereof, and FIG. 2 illustrates a process of attaching the woven fabric 3 to the unvulcanized rubber plate 9. It is a side view.

The short diagonal lines in FIG. 1 (a) indicate that the yarns 27 intersect, and the weave angle β of the cog groove 8 of the cogged transmission belt 1 is formed to be larger than the weave angle α of the crest 7. Have been. The woven fabric 3 used as a protective layer of the cushion layer is made of cotton, nylon, polyester, or a blend thereof, and is cut into a bias and is joined to a long length. Before being formed into a belt, the crossing angle (texture angle) between the warp and the weft is 90 ° to 120 °. FIG. 1B shows a side view of the transmission belt 1 with cogs. An outer protective layer 5 is provided outside the tension layer 4 (on the left side in this figure), and inside the tension layer 4 (in this figure, FIG. 1B). Right)
, A cushion layer 18 having a cog 2 on which the woven fabric 3 is laminated along the inner peripheral surface is laminated.

The texture angle β of the cog groove portion 8 is
A method for manufacturing a cogged power transmission belt for making the transmission belt larger than the weave angle α will be described with reference to FIGS. The unvulcanized rubber plate 9 is formed in the same manner as in the conventional manufacturing method shown in FIG. However, the unvulcanized cushion rubber 6 is directly pressed into the embossing die 10 without attaching the woven fabric 3. That is, the unvulcanized cushion rubber 6 is placed on the upper surface of the embossing die 10, and the unvulcanized rubber plate 9 is formed by pressing and press-fitting the upper part of the unvulcanized cushion rubber 6 with the pressing plate 11. .

Subsequently, as shown in FIG. 2, the unvulcanized rubber plate 9 is suspended around a rotatable forming roller 17 with its unvulcanized cog side as the outside. The woven fabric 3 is guided to the outside of the bent cog groove 8 of the unvulcanized rubber plate 9, and the toothed roller 15 having the teeth 16 corresponding to the shape of the cog groove 8 is guided from the outside of the woven fabric 3. The woven fabric 3 is pressed against the unvulcanized rubber plate 9 by pressing. The toothed roller 15 and the forming roller 17 are rotated in synchronization with each other, and while the unvulcanized rubber plate 9 is being fed, the woven fabric 3 is supplied under a predetermined tension (including zero). Is laminated on the unvulcanized rubber plate 9 to form a cushion layer 23 with an unvulcanized cog.

On the upper surface of the molding roller 17, the unvulcanized rubber plate 9
Is convexly curved with the cog on the outside, the cog groove 8
Is greatly stretched, and the cog peak 7 is hardly stretched. Woven fabric 3 not stretched with cog groove 8 stretched
Is pressed, the cushion layer 2 with the unvulcanized cog is
When the surface 3 is restored to the planar shape, the cog groove 8 contracts, and the weave angle of the woven fabric 3 is larger than the weave angle of the woven fabric 3 at the time of crimping. When tension is applied to the woven fabric 3 during the crimping work, the weave angle of the entire woven fabric 3 becomes small,
The texture angle β of the cog groove 8 is kept larger than the texture angle α of the peak 7 (the angle difference remains).

The method of manufacturing the transmission belt with cogs of the present invention using the unvulcanized cushion layer with cogs 23 is the same as the method of manufacturing the conventional transmission belt with cogs. That is, the unvulcanized cog portion is fitted into the vulcanizing groove portion with the unvulcanized cog cushion layer 23 in a cylindrical mold (not shown) in which a vulcanizing groove portion corresponding to the cog is formed on the outer peripheral surface. After winding, an unvulcanized tension layer and an outer protective layer were wound around the outer peripheral surface in this order to form an unvulcanized transmission belt with cogs. An unvulcanized cog transmission belt externally fitted to the cylindrical mold is covered with a rubber sleeve having a smooth inner surface, and the entire unvulcanized cog transmission belt is pressurized with high-pressure steam from the outside of the rubber sleeve. After heating and vulcanization, the mold was removed from the mold and cut into a predetermined width to produce a transmission belt with cogs.

[0028]

The results of evaluation of the thus-produced transmission belt with cogs (Example) and the conventional transmission belt with cogs (Comparative Example) by running tests are shown below. The weaving angle of the woven fabric before bonding was 120 ° (Example 1, Example 2, Comparative Example 1) and 90 ° (Example 3, Example 4, Comparative Example 2), and the forming roller 17 was used. The outer diameter used was 35 mm (Examples 1 and 3) and 50 mm (Examples 2 and 4).

Embodiment 1 As described above, first, the unvulcanized cushion rubber 6 containing fibers is directly pressed into the molding groove 19 of the embossing die 10 shown in FIG. Then, an unvulcanized rubber plate 9 made of only the unvulcanized cushion rubber was formed. As shown in FIG. 2, the unvulcanized rubber plate 9 is hung around a forming roller 17 having an outer diameter of 35 mm with the cog groove 8 on the outside, and the woven cloth 3 having a weave angle of 120 ° is cut into the cog groove 8. , And the toothed roller 15 is pressed against the upper surface (outside). The molding roller 17 and the toothed roller 15 were rotated in synchronization with each other, and the woven fabric 3 and the unvulcanized rubber plate 9 were continuously fed and laminated to produce the unvulcanized cog-cushioned cushion layer 23. This unvulcanized cog-cushioned cushion layer 23 was wound around a cylindrical mold having a vulcanization groove, and a tension layer and an outer protective layer were wound around the outside thereof, and then vulcanized and cut into rings to complete a cogged power transmission belt. .

Example 2 An unvulcanized rubber plate 9 molded in the same manner as in Example 1 was
An unvulcanized cog-cushion layer 23 was formed by being hung around a 0 mm forming roller 17, and a cog-type power transmission belt was formed in the same manner as in Example 1.

Example 3 A woven cloth having a weave angle of 90 ° was pressed against an unvulcanized rubber plate 9 molded in the same manner as in Example 1 by the same means as in Example 1 to form a cushion layer 23 with an unvulcanized cog. Molded. Subsequently, a transmission belt with cogs was formed in the same manner as in Example 1.

Example 4 An unvulcanized rubber plate 9 molded in the same manner as in Example 1 was
A woven cloth having a weave angle of 90 ° was pressure-bonded by the same means as in Example 1 to form a cushion layer 23 with an uncured cog. Subsequently, a transmission belt with cogs was formed in the same manner as in Example 1.

Comparative Example 1 As shown in FIG. 6, the molding groove 19 of the embossing die 10
The woven fabric 3 having a texture angle of 120 ° is adhered along the line, and the unvulcanized cushion rubber 6 containing fibers is rolled from above the woven fabric 3 so that the woven fabric 3 adheres to the inside (lower surface). The vulcanized cushion rubber layer 23 was formed. The unvulcanized cog-cushioned cushion layer 23 is wound around a cylindrical mold having a vulcanizing groove (not shown) in the same manner as in Example 1, and a tension layer and an outer protective layer are wound around the outside in this order. We finished the transmission belt with cogs by cutting it in a circle.

Comparative Example 2 Comparative Example 1 except that the weave angle of the woven fabric 3 was changed to 90 °.
The transmission belt with cogs was finished in the same manner as described above.

The transmission belt with cogs formed according to these Examples and Comparative Examples was subjected to a bending traveling test using a traveling test machine 30 shown in FIG. As an evaluation method, a running time (also referred to as a crack occurrence time) until a crack that can be visually confirmed in the cog groove portion was measured, and Example 1 and Example 2 in which the crack occurrence time in Comparative Example 1 was 100. The crack generation times of Examples 3 and 4 where the crack generation time of Comparative Example 2 was set to 100 were compared with each other, and the ratio was evaluated. Tables 1 and 2 show the manufacturing conditions of the above samples and the results of the running test in comparison. Table 1 shows a case where the weave angle of the woven fabric before being attached to the unvulcanized rubber plate is 120 °, and Table 2 shows a case where the weave angle is 90 °.

[0036]

[Table 1]

[0037]

[Table 2]

The traveling test machine 30 shown in FIG. 8 suspends the cog-equipped transmission belt 1 to be evaluated between the driving pulley 25 and the driven pulley 26 to which a force is constantly applied in a direction separated by the weight w. Then, the back pulley 12 is pressed by a predetermined force from the back of the transmission belt 1 with cogs and rotated in the direction of the arrow x while bending inward. After the start of the test, the test is stopped every predetermined time, the crack state is observed, and the time until the first crack is found is measured.

As a result of the measurement, the texture angle 12 shown in Table 1 was obtained.
In the case of using a 0 ° woven fabric, the weave angle β of the cog groove is larger than the weave angle of the original woven fabric, the weave angle α at the peak is smaller than the weave angle of the original woven fabric, and the angle difference is the roller diameter. The smaller is the larger. Therefore, the time until crack generation is 145 in Example 1 and 128 in Example 2 assuming that Comparative Example 1 is 100, which greatly increases the time until crack generation. large.

When a woven fabric having a weave angle of 90 ° shown in Table 2 is used, the groove weave angle β becomes larger than the weave angle of the original woven fabric, and the crest weave angle α becomes smaller than the weave angle of the original woven fabric. The angle difference increases as the roller diameter decreases. Therefore, the time until cracks occurred was 157 for Example 3 and 100 for Comparative Example 2.
In Example 4, the value was 133, and the time until the occurrence of cracks was greatly increased. In Example 3, the effect was particularly great. Further, the effect of preventing the occurrence of cracks is greater than when the weave angle of the original woven fabric shown in Table 1 is 120 °. That is, the effect is greater when the weave angle of the original woven fabric is small.

[0041]

As is apparent from the above description,
The cogged transmission belt of the present invention and the method of manufacturing the same include:
The following effects are obtained.

(1) The transmission belt with cogs according to claim 1 is designed such that the weave angle β of the cog grooves is larger than the weave angle α of the crest, so that the belt is repeatedly bent inwardly by the back pulley. On the other hand, there is room to change the weave angle of the cog groove portion, the tension applied to the weave yarn is reduced, and the weave yarn does not break. Therefore, a long life can be obtained even in a transmission belt with cogs using a back pulley.

(2) The transmission belt with cogs according to claim 2 is designed such that the weaving angle of the woven fabric at the top of the crest is within a certain range, so that the forming workability is good and the cog is extended. Even when is used, excessive load is not applied to the woven yarn of the woven fabric, and it is possible to withstand running for a long time.

(3) In the transmission belt with cogs according to the third aspect, the texture angle β of the cog groove portion is designed to be 7 ° to 30 ° larger than the texture angle α of the cog crest portion, and the cog side is protruded by the back pulley. When repeatedly bent, the woven fabric in the cog groove portion is stretched to reduce the weave angle, but still approximates the weave angle of the crest portion, and no excessive tension is applied to the woven yarn in the cog groove portion.

(4) In the power transmission belt with cogs according to the fourth aspect, the cogs are made of rubber containing fibers. The mixed fiber hardens the cushion rubber, restricts the expansion and contraction in the belt width direction, eliminates the expansion and contraction of the woven fabric at the peak, and increases the expansion and contraction of the cog groove, so that the effect of increasing the weave angle is further enhanced.

(5) The method for manufacturing a transmission belt with cogs according to claim 5 can efficiently manufacture the transmission belt with cogs according to claims 1-4. In particular, the texture angle of the cog groove portion can be made larger than the texture angle of the crest portion by bonding the woven fabric in a state where the cog is bent outward and the cog groove portion is stretched on the unvulcanized rubber plate.

[Brief description of the drawings]

FIG. 1 is a view for explaining a weave angle of a transmission belt with cogs according to the present invention, wherein FIG. 1 (a) is a partial plan view and FIG.
(B) is a side view thereof.

FIG. 2 is a side view illustrating a step of pressing a woven fabric 3 onto an unvulcanized rubber plate 9 which is an intermediate product of the transmission belt with cogs of the present invention.

FIG. 3 shows an example of a state in which the transmission belt with cogs is used, and shows a case in which a rear pulley 12 is used on the back surface of the transmission belt with cogs 1 suspended between two pulleys.

FIG. 4 is a view for explaining expansion and contraction of a cog groove when the cog transmission belt 1 is bent so that the cog side is convex.
(A) shows the case where the transmission belt with cogs is placed on a plane, and FIG. 4 (b) shows the state where the cogs are bent to be convex.

5A and 5B are diagrams illustrating a weave angle of a conventional cogged power transmission belt, wherein FIG. 5A is a partial plan view and FIG.
Is a side view thereof.

FIG. 6 is a side view illustrating a step of forming a conventional unvulcanized cog-attached cushion layer 23.

FIG. 7 is a partial perspective view of the cogged power transmission belt 1 of the present invention.

FIG. 8 is a side view illustrating the structure of a running test machine.

[Explanation of symbols]

 1: Transmission belt with cog 2: Cog 3: Woven cloth 4: Tension layer 5: Outer protection layer 7: Crest section 8: Cog groove section 9: Unvulcanized rubber plate 10: Embossed mold 11: Pressure plate 12: Back pulley 15: Toothed roller 17: Forming roller 18: Cushion layer 23: Cushion layer with unvulcanized cog α: Crest texture angle β: Cog groove texture angle

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B29K 311: 10

Claims (5)

[Claims] 1. A cog transmission belt in which a cushion layer having a cog whose inner peripheral surface is protected by a woven fabric is formed inside a tension layer having an outer protective layer on the back surface, wherein the cog groove portion has a cog groove. A transmission belt with cogs, wherein the weave angle of the woven fabric is greater than the weave angle at the peak. 2. The cogged transmission belt according to claim 1, wherein the weave angle of the woven fabric at the peak is 80 to 130 °. 3. The conductive belt with cogs according to claim 1, wherein a weave angle of the woven fabric in the cog groove portion is formed to be larger by 7 to 30 degrees than a weave angle of the crest portion. 4. The transmission belt with cogs according to claim 1, wherein said cushion layer is mainly composed of fiber-containing rubber. 5. Inside a tension layer having a protective layer on the back side,
What is claimed is: 1. A method for manufacturing a cogged transmission belt having a cushion layer having a cog whose inner peripheral surface is protected by a woven fabric, comprising: a flat embossing die having a molding groove corresponding to the cog shape on the surface; An unvulcanized cushion rubber is press-fitted to form an unvulcanized rubber plate having an unvulcanized cog portion, and the unvulcanized rubber plate is rotated with a predetermined outer diameter with the unvulcanized cog portion outside. Hanging on a possible forming roller, applying the woven cloth to the cog groove of the unvulcanized rubber plate suspended on the forming roller, and tooth portions corresponding to the cog groove on the upper surface of the attached woven cloth. Is pressed in contact with the toothed roller having, and while the woven fabric and the unvulcanized rubber plate are being supplied, the toothed roller and the forming roller are rotated in synchronization with each other, so that the entire length of the unvulcanized rubber plate is Cushion layer with uncured cog by laminating woven fabric Then, in a cylindrical mold having a vulcanizing groove corresponding to the cog on the outer peripheral surface, the unvulcanized cog-cushioned cushion layer is formed with the vulcanizing groove and the unvulcanized cog. And the unvulcanized cog transmission belt is formed by winding the unvulcanized tension layer and the outer protective layer around the outer peripheral surface in this order to form an unvulcanized cog transmission belt. A rubber belt having a smooth inner surface is covered, and the whole of the unvulcanized transmission belt with cogs is heated and vulcanized while being pressed from the outside of the rubber sleeve. A method for manufacturing a transmission belt with cogs, comprising: