WO2016136975A1

WO2016136975A1 - Transmission belt, method for manufacturing transmission belt, reinforcing fabric, and method for manufacturing reinforcing fabric

Info

Publication number: WO2016136975A1
Application number: PCT/JP2016/055909
Authority: WO
Inventors: 吉田　正邦; 西村　年弘; 泰介木村
Original assignee: 三ツ星ベルト株式会社
Priority date: 2015-02-27
Filing date: 2016-02-26
Publication date: 2016-09-01

Abstract

The present invention is directed to a transmission belt (1) provided with: a compressed rubber layer (12) provided on the inner circumferential side; a cog part (18) that is provided on at least the compressed rubber layer (12) and in which cog peaks (18a) and cog troughs (18b) are alternately arranged along a belt longitudinal direction; and a reinforcing fabric layer (11) that covers the surface of the cog part (18). The reinforcing fabric layer (11) includes at least one reinforcing fabric (19) that is adhered to the surfaces of the cog peaks (18a) and the cog troughs (18b) along the belt longitudinal direction to cover the surface of the cog part (18), both end portions of the reinforcing fabric (19) are jointed to each other only at at least one joint part (20) in the belt longitudinal direction, and the joint part (20) is disposed only at a position corresponding to a cog peak (18a).

Description

Transmission belt, transmission belt manufacturing method, reinforcing cloth, and reinforcing cloth manufacturing method

The present invention relates to a transmission belt, a transmission belt manufacturing method, a reinforcing cloth, and a reinforcing cloth manufacturing method.

Conventionally, transmission belts have been widely used in drive mechanisms in the field of machinery for automobiles, motorcycles or general industries. In recent years, the use of such transmission belts under a high load environment has increased. Therefore, improvement in durability of the transmission belt under a high load environment is demanded.

Especially, in a transmission belt for applications where high durability is required, while the rigidity of the belt body is required to be improved, the flexibility of the belt body is also required. In such an application, a transmission belt having improved flexibility by providing a cog portion on the inner peripheral compression rubber layer is used. In addition, a cog part is comprised as a part by which the cog mountain and the cog valley were alternately arranged along the belt longitudinal direction which is the circumferential direction of a transmission belt. Further, in order to improve the durability of the transmission belt as described above, a reinforcing cloth is also disposed on the surface of the cog portion. As an application in which the above transmission belt is used, for example, there is a low edge V belt (transmission belt) used for a continuously variable transmission.

For example, those disclosed in Patent Documents 1 to 4 are known as transmission belts having a reinforcing cloth disposed on the surface. In the transmission belt disclosed in Patent Document 1, a reinforcing cloth is disposed on both the inner peripheral surface and the outer peripheral surface. The reinforcing cloth on the surface of the transmission belt of Patent Document 1 is joined at a joint extending at an oblique angle (bias angle) with respect to the belt longitudinal direction (circumferential direction of the transmission belt). Further, in the reinforcing cloth on the surface of the transmission belt of Patent Document 1, in addition to the joint at an oblique angle with respect to the belt longitudinal direction, the joint extending along the belt width direction which is a direction orthogonal to the belt longitudinal direction. Department is also provided.

Patent Documents 2 to 4 disclose a power transmission belt configured as a V-ribbed belt. And the transmission belt disclosed by patent document 2 thru | or 4 has arrange | positioned the reinforcement cloth on the upper surface. That is, in each of the power transmission belts disclosed in Patent Documents 2 to 4, the reinforcing cloth is disposed on the outer peripheral surface opposite to the inner peripheral side provided with a plurality of ribs extending along the belt longitudinal direction. Has been.

In addition, the reinforcing cloth on the outer peripheral side surface of the transmission belt of Patent Document 2 is formed by joining the ends of a band cloth formed by joining the ends of a plurality of cloth pieces. Yes. For this reason, as for the reinforcement cloth disclosed by patent document 2, the junction part is provided in several places in the belt longitudinal direction.

Further, the reinforcing cloth on the outer peripheral surface of the transmission belt of Patent Document 3 is a cut canvas formed by cutting a cylindrical bag woven fabric spirally with respect to the cylindrical axial direction. It is used as. The cut canvas is stretched in a direction perpendicular to the longitudinal direction, impregnated with an adhesive liquid, cut to a predetermined length, and ends thereof are joined.

Further, as the reinforcing cloth on the outer peripheral surface of the transmission belt of Patent Document 4, a tubular canvas produced by sewing and joining plain woven canvas at the end in the width direction is used as a material. And a cylindrical canvas is cut | disconnected spirally with respect to a cylindrical axial direction, and is used as a reinforcement cloth. For this reason, in this reinforcing fabric, the portion where the end portions in the width direction of the plain woven fabric are joined as a joining portion extending at an oblique angle (bias angle) with respect to the belt longitudinal direction (circumferential direction of the transmission belt). It will remain.

Japanese Patent Publication No. 63-24181 Japanese Patent No. 3709472 Japanese Laid-Open Patent Publication No. 11-300847 Japanese Unexamined Patent Publication No. 2000-352444

As described above, in applications where high durability is required, a transmission belt in which a cog portion is provided on a compression rubber layer on the inner peripheral side is used from the viewpoint of achieving both rigidity and flexibility of the belt body. Such a transmission belt is required to be stretchable following the bending of the transmission belt in the cog valley of the cog portion with respect to the bending of the transmission belt during traveling. For this reason, the cog valley in the cog portion is a portion where stress is concentrated during bending during belt running.

On the other hand, the durability of the transmission belt can be improved by arranging the reinforcing cloth as disclosed in Patent Documents 1 to 4 on the surface of the cog portion. However, even in the case of a transmission belt having a reinforcing cloth arranged on the surface of the cog part, when used in a high load environment, cracks easily occur in the cog valley of the cog part, and it is difficult to ensure a sufficient life. Otherwise, the transmission belt may be damaged.

Based on the above situation, the inventor of the present application can suppress the transmission belt from being damaged at an early stage even when used in a high load environment, and can achieve high durability. We conducted intensive research on belts. As a result, when the joint part of the reinforcing cloth arranged on the surface of the cog part exists in the cog valley, the inventor of the present application tends to concentrate the stress acting on the joint part unevenly, resulting in excessive stress concentration. It has been found that cracks are likely to occur early in the joint. Furthermore, the inventor of the present application has found that when the joint portion of the reinforcing cloth is present in the cog valley, the reinforcement cloth tends to be insufficiently expanded and contracted when the transmission belt is bent, and the joint portion is likely to crack early.

Note that the reinforcing fabrics disclosed in Patent Documents 1 and 4 are joined at a joint extending at an oblique angle (bias angle) with respect to the belt longitudinal direction (circumferential direction of the transmission belt). For this reason, when the reinforcing cloths of Patent Documents 1 and 4 are arranged on the surface of the cog part, at least a part of the joint part is always present in the cog valley, and the crack of the cog valley occurs early in that part. There is a risk of it. Further, all of the reinforcing cloths disclosed in Patent Documents 2 to 4 are reinforcing cloths disposed on the outer peripheral surface of the transmission belt. For this reason, depending on the configurations disclosed in Patent Documents 2 to 4, the transmission belt in which the cogged portion is provided on the inner compression rubber layer has high durability when used in a high load environment. It is impossible to provide a configuration to realize.

The present invention has been made in view of the above circumstances, and its purpose is to suppress the early occurrence of cracks in the Cog Valley even when used in a high-load environment. It is providing the transmission belt which can implement | achieve durability, the manufacturing method of a transmission belt, the reinforcing cloth, and the manufacturing method of a reinforcing cloth.

(1) A transmission belt according to one aspect of the present invention for achieving the above object is a compression rubber layer provided on an inner peripheral side, at least provided in the compression rubber layer, and a cog mountain along the belt longitudinal direction. A transmission belt comprising cog portions in which cog valleys are alternately arranged, and a reinforcing cloth layer covering a surface of the cog portion, wherein the reinforcing cloth layer is formed along the belt longitudinal direction with the cog mountain and the cog It includes at least one reinforcing cloth that is bonded to the surface of the cog valley and covers the surface of the cog part, and the reinforcing cloth is bonded at both ends only by at least one joining part in the belt longitudinal direction, The said junction part is arrange | positioned only in the position corresponding to the said Kog mountain.

According to this configuration, the reinforcing cloth that covers the surface of the cog portion along the belt longitudinal direction is joined at both ends, and is joined only at at least one joint in the belt longitudinal direction. And the junction part provided in at least one place in the reinforcement cloth is arrange | positioned in the position corresponding to a Kog mountain. For this reason, the joint part of a reinforcement cloth is certainly arrange | positioned at a cog mountain, and is not arrange | positioned at a cog valley.

Therefore, according to the above configuration, the joint part of the reinforcing cloth arranged on the surface of the cog portion does not exist in the cog valley. For this reason, it is suppressed that a stress concentrates unevenly in a cog valley, and invites an excessive stress concentration, and can make the stress uniform in a cog valley. In addition, it is possible to suppress the expansion and contraction of the reinforcing cloth when the transmission belt is bent, and it is possible to improve the bending fatigue resistance. Thereby, even if it is a case where the transmission belt of said structure is used in a high load environment, it can suppress that a crack arises early in a cog valley, and can aim at the improvement of a durable life. That is, it is possible to achieve high durability when used in a high load environment.

Therefore, according to the above configuration, even when used in a high load environment, it is possible to suppress the early occurrence of cracks in the cog valley, and it is possible to realize high durability. Can be provided.

(2) It is preferable that the transmission belt has only one joint.

According to this configuration, since there is only one joint in the transmission belt, it is possible to ensure the durability of the transmission belt as compared with the case where there are a plurality of joints in the transmission belt.

(3) It is preferable that the said joint part is provided so that it may extend substantially linearly along the direction substantially orthogonal to the said belt longitudinal direction.

When the joint portion is provided so as to extend substantially linearly along the belt width direction (a direction substantially orthogonal to the belt longitudinal direction) as in this configuration, the joint portion of the reinforcing cloth disposed on the cog mountain is provided. Part of it will not be placed in the Cog Valley off the Mt. Cog. That is, the joint portion of the reinforcing cloth does not extend at an oblique angle (bias angle) with respect to the belt longitudinal direction (circumferential direction of the transmission belt), and is surely disposed on the cog mountain. Therefore, according to this structure, a junction part can be arrange | positioned only to a cog mountain more reliably.

(4) The reinforcing cloth is a wide-angle woven cloth having a crossing angle between the warp and the weft as viewed from the belt longitudinal direction of 110 degrees or more and 130 degrees or less, and the wide-angle woven cloth is made of a cured product of an adhesive liquid. It is preferable that the warp and the weft are fixed to each other.

As in this configuration, by setting the crossing angle between the warp and the weft as viewed from the longitudinal direction of the belt to 110 degrees or more and 130 degrees or less, the reinforcing fabric including these warps and wefts sufficiently follows the bending of the transmission belt. And can be expanded and contracted. Thereby, durability of a reinforcement cloth can be improved more.

(5) It is preferable that the reinforcing cloth is produced by a reinforcing cloth producing process including a cutting process, an adhesive liquid dipping process, a wide-angle treatment process, and a drying process.
In the cutting step, a bag woven fabric constituted by weaving warps extending along the axial direction and wefts extending along the circumferential direction is cut spirally with respect to the axial direction,
In the adhesive liquid immersion step, a continuous continuous belt-like cloth produced by spirally cutting the bag woven fabric is immersed in the adhesive liquid,
In the wide-angle treatment step, the belt-like cloth to which the adhesive liquid is attached is stretched in the width direction,
In the drying step, it is preferable that the wide-angle woven fabric obtained in the wide-angle treatment step is dried and the adhesive liquid is cured.

According to this configuration, when the reinforcing cloth for the transmission belt is manufactured, the belt-like cloth to which the adhesive liquid is attached is stretched in the width direction, and the crossing angle between the warp and the weft can be widened. At that time, since the belt-like cloth is stretched in the width direction so that the length in the longitudinal direction is shortened, a continuous wide-angle woven cloth with an expanded intersection angle can be easily produced. Moreover, according to said structure, the hardening process of an adhesive liquid is performed by drying the wide angle woven fabric with which the crossing angle was expanded with the adhesive liquid adhering. For this reason, it is possible to quickly cure the adhesive liquid while maintaining a desired crossing angle, and to fix the crossing angle. Therefore, the desired crossing angle can be efficiently maintained by performing the bonding process and the crossing angle widening process at substantially the same timing.

(6) A method for manufacturing a transmission belt according to a certain aspect of the present invention for achieving the above object includes a compressed rubber layer provided on an inner peripheral side, at least provided in the compressed rubber layer, along the longitudinal direction of the belt. A transmission belt manufacturing method for manufacturing a transmission belt having a cog portion in which cog mountains and cog valleys are alternately arranged, and a reinforcing cloth layer covering the surface of the cog portion, the reinforcement for producing the reinforcing cloth A cloth manufacturing step, the reinforcing cloth layer including at least one reinforcing cloth, and the unvulcanized rubber sheet for the compressed rubber layer are laminated, and the cogged portion is provided on the unvulcanized rubber sheet. Forming an endless laminated body, a laminated body forming step, a belt molded body forming step for forming an unvulcanized belt molded body from the laminated body, and a vulcanizing step for vulcanizing the belt molded body, In the laminate forming step, The reinforcing cloth layer is bonded to the surfaces of the cog mountain and the cog valley in the laminated body, and the reinforcing cloth is disposed so as to cover the surface of the cog part along the belt longitudinal direction. Both ends of the cloth are joined by only at least one joining portion in the belt longitudinal direction, and the joining portion is disposed only at a position corresponding to the cog mountain.

According to this configuration, the reinforcing cloth covering the surface of the cog portion along the belt longitudinal direction is joined at both ends, and is joined only at at least one joint in the belt longitudinal direction. And the junction part provided in at least one place in the reinforcement cloth is arrange | positioned in the position corresponding to a Kog mountain. For this reason, in the transmission belt manufactured by the above configuration, the joint portion of the reinforcing cloth is always arranged in the cog mountain and is not arranged in the cog valley.

Therefore, according to the above configuration, it is possible to manufacture a transmission belt in which the joint portion of the reinforcing cloth disposed on the surface of the cog portion does not exist in the cog valley. For this reason, according to the transmission belt manufactured by the above-described configuration, it is possible to suppress stress concentration in the cog valley unevenly and invite excessive stress concentration, thereby achieving uniform stress in the cog valley. it can. In addition, it is possible to suppress the expansion and contraction of the reinforcing cloth when the transmission belt is bent, and it is possible to improve the bending fatigue resistance. Thereby, even when the transmission belt is used under a high load environment, it is possible to suppress the early occurrence of cracks in the cog valley, and to manufacture a transmission belt that can improve the durability life. be able to. That is, it is possible to manufacture a transmission belt that can realize high durability when used in a high load environment.

Therefore, according to the above configuration, even when used in a high load environment, it is possible to suppress the early occurrence of cracks in the cog valley, and a transmission belt that can realize high durability. A manufacturing method can be provided.

(7) In the method for manufacturing the transmission belt, it is preferable that only one joint is present.

(8) It is preferable that the said joining part is arrange | positioned so that it may extend substantially linearly along the direction substantially orthogonal to the said belt longitudinal direction.

(9) In the belt molded body forming step, it is preferable that another layer is laminated on the opposite side of the laminated body from the cog portion.

According to this configuration, since another layer is laminated on the opposite side of the laminated body from the cog portion, a transmission belt having an appropriate configuration can be manufactured.

(10) The reinforcing cloth manufacturing step includes a cutting step, an adhesive liquid dipping step, a wide-angle treatment step, and a drying step. In the cutting step, the warp yarn extends along the axial direction and along the circumferential direction. A bag woven fabric formed by weaving extending wefts was cut in a spiral shape with respect to the axial direction, and the bag woven fabric was cut in a spiral shape in the adhesive immersion step. A continuous belt-like cloth without a seam is immersed in an adhesive liquid, and in the wide-angle treatment step, the belt-like cloth to which the adhesive liquid is attached is stretched in the width direction, and in the drying step, the wide-angle treatment step is performed. It is preferable that the wide-angle woven fabric obtained by drying is dried and the adhesive liquid is cured.

According to this configuration, in the production of the reinforcing cloth for the transmission belt, the band-shaped cloth to which the adhesive liquid is attached is stretched in the width direction to widen the crossing angle between the warp and the weft. Since the cloth is stretched in the width direction, it is possible to easily produce a continuous wide-angle woven cloth with an increased cross angle. Moreover, according to said structure, the hardening process of an adhesive liquid is performed by drying the wide angle woven fabric with which the crossing angle was expanded with the adhesive liquid adhering. For this reason, it is possible to quickly cure the adhesive liquid while maintaining a desired crossing angle, and to fix the crossing angle. Therefore, the desired crossing angle can be efficiently maintained by performing the bonding process and the crossing angle widening process at substantially the same timing.

(11) In the wide-angle treatment step, the wide-angle treatment is performed so that the belt-like cloth to which the adhesive liquid is attached has an intersection angle between the warp and the weft as viewed from the belt longitudinal direction of 120 degrees or more and 140 degrees or less. Is preferably made.

As in this configuration, the belt-like cloth to which the adhesive liquid is attached is subjected to a wide-angle treatment so that the crossing angle between the warp and the weft viewed from the belt longitudinal direction is 120 degrees or more and 140 degrees or less. The crossing angle between the warp and the weft contained in the reinforcing fabric is a crossing angle slightly smaller than 120 degrees or more and 140 degrees or less (for example, 110 degrees or more and 130 degrees or less). By setting the crossing angle between the warp and the weft included in the reinforcing fabric after the vulcanization process to 110 degrees or more and 130 degrees or less, the reinforcing cloth including these warps and wefts sufficiently follows the bending of the transmission belt. It is possible to expand and contract. Thereby, durability of a reinforcement cloth can be improved more.

(12) A reinforcing cloth according to a side surface of the present invention for achieving the above object is a compressed rubber layer provided on an inner peripheral side, at least provided in the compressed rubber layer, and a cog mountain along the belt longitudinal direction. The transmission cloth includes a cog portion in which cog valleys are alternately arranged and a reinforcing cloth layer that covers the surface of the cog portion, and is included in the reinforcing cloth layer, and both ends are at least one in the belt longitudinal direction. A reinforcing fabric that is joined only at the joint, and that is disposed only at a position corresponding to the cog mountain, and an intersecting angle between the warp and the weft viewed from the longitudinal direction of the belt is 110 degrees or more and 130 degrees. The warp and the weft are fixed to each other by a cured product of an adhesive liquid.

According to this configuration, the reinforcing cloth covering the surface of the cog portion along the belt longitudinal direction is joined at both ends, and is joined only at at least one joint in the belt longitudinal direction. And the junction part provided in at least one place in the reinforcement cloth is arrange | positioned in the position corresponding to a Kog mountain. For this reason, the joint part of a reinforcement cloth is certainly arrange | positioned at a cog mountain, and is not arrange | positioned at a cog valley.

Further, as in this configuration, by setting the crossing angle between the warp and the weft as viewed from the longitudinal direction of the belt to 110 degrees or more and 130 degrees or less, the reinforcing fabric including these warps and wefts is sufficient for bending the transmission belt. It is possible to expand and contract following the above. Thereby, durability of a reinforcement cloth can be improved more.

Therefore, according to the above configuration, even when used in a high load environment, it is possible to suppress the early occurrence of cracks in the cog valley and to achieve a high durability. A suitable reinforcing fabric can be provided.

(13) A method for manufacturing a reinforcing cloth according to a certain aspect of the present invention for achieving the above object includes a compressed rubber layer provided on an inner peripheral side, at least provided in the compressed rubber layer, along the longitudinal direction of the belt. Included in the reinforcing fabric layer in the transmission belt provided with a cog portion in which cog mountains and cog valleys are alternately arranged, and a reinforcing fabric layer covering the surface of the cog portion, and both end portions in the longitudinal direction of the belt A method for manufacturing a reinforcing cloth that is joined only by at least one joint, and the joint is disposed only at a position corresponding to the cog mountain, and includes a cutting step, an adhesive liquid dipping step, a wide-angle treatment step, and drying. In the cutting step, a bag woven fabric configured by weaving warps extending along the axial direction and wefts extending along the circumferential direction is cut spirally with respect to the axial direction, In the adhesive dipping process Is a belt-like cloth produced by cutting the bag-woven cloth into a spiral shape, and is immersed in an adhesive liquid, and in the wide-angle treatment step, the belt-like cloth to which the adhesive liquid is attached is stretched in the width direction, In the drying step, the wide-angle woven fabric obtained in the wide-angle treatment step is dried, and the adhesive liquid is cured.

Therefore, according to the above configuration, even when used in a high load environment, it is possible to suppress the early occurrence of cracks in the cog valley and to achieve a high durability. The manufacturing method of the included reinforcement cloth can be provided.

In addition, according to this configuration, the length in the longitudinal direction is reduced during the wide-angle treatment process in which the belt-like cloth to which the adhesive liquid is attached is stretched in the width direction and the crossing angle between the warp and the weft is widened when the reinforcing cloth for the transmission belt is manufactured. As described above, since the belt-like cloth is stretched in the width direction, a continuous wide-angle woven cloth with an increased crossing angle can be easily produced. Moreover, according to said structure, the hardening process of an adhesive liquid is performed by drying the wide angle woven fabric with which the crossing angle was expanded with the adhesive liquid adhering. For this reason, it is possible to quickly cure the adhesive liquid while maintaining a desired crossing angle, and to fix the crossing angle. Therefore, the desired crossing angle can be efficiently maintained by performing the bonding process and the crossing angle widening process at substantially the same timing.

According to the present invention, even when used in a high-load environment, it is possible to suppress the early occurrence of cracks in the cog valley, and to achieve high durability. , A reinforcing cloth, and a reinforcing cloth manufacturing method can be provided.

FIG. 1 is a diagram showing the overall shape of a transmission belt according to an embodiment of the present invention. FIG. 2 is a cross-sectional perspective view showing a part of the transmission belt shown in FIG. FIG. 3 is a cross-sectional view showing a part of the transmission belt shown in FIG. FIG. 4 is a cross-sectional view showing a part of a cog portion in the transmission belt shown in FIG. FIG. 5 is a chart showing a method for manufacturing the transmission belt shown in FIG. FIG. 6 is a chart showing a reinforcing cloth manufacturing process in the manufacturing method shown in FIG. FIG. 7 is a diagram for explaining a cutting process in the reinforcing cloth manufacturing process shown in FIG. 6, and is a schematic diagram showing a part of the bag woven cloth. FIG. 8 is a schematic view showing a part of the belt-like cloth produced in the cutting process. FIG. 9 is a diagram for explaining the wide-angle treatment process in the reinforcing cloth manufacturing process shown in FIG. 6, and is a schematic view showing a part of the belt-like cloth and the wide-angle woven cloth. FIG. 10 is a schematic diagram of an apparatus layout of a production line that executes each process in the adhesive solution dipping process, the wide-angle processing process, and the drying process in the reinforcing cloth manufacturing process illustrated in FIG. 6. FIG. 11 is a schematic diagram showing a wide-angle processing apparatus in the production line shown in FIG. FIG. 12 is a diagram for explaining a laminated body forming step in the manufacturing method shown in FIG. 5, and is a schematic diagram showing a state in which a reinforcing cloth is wound around the outer periphery of the mold. FIG. 13 is a view for explaining a laminated body forming step, and is a view for explaining a step of winding a reinforcing cloth around the outer periphery of the mold. FIG. 14 is a cross-sectional view schematically illustrating a laminated body forming process, which shows a part of the outer periphery of the mold and a part of the reinforcing cloth wound around the outer periphery of the mold. FIG. 15 is a diagram for explaining the laminated body forming step, and is a diagram schematically showing a state in which an unvulcanized rubber sheet is arranged on the outer periphery of a mold around which a reinforcing cloth is wound. FIG. 16 is a diagram for explaining a laminated body forming step, in which a reinforcing cloth and an unvulcanized rubber sheet are laminated on the outer periphery of the mold, and a cog portion is provided on the unvulcanized rubber sheet. It is a figure which shows typically the state in which the endless laminated body was formed. FIG. 17 is a diagram schematically showing a layout of a test apparatus for a performance evaluation test of a transmission belt. FIG. 18 is a view for explaining a modified example of the joint portion of the reinforcing cloth, and is a cross-sectional view showing a cog portion and a part of the reinforcing cloth. FIG. 19 is a cross-sectional view schematically illustrating a reinforcing cloth, an unvulcanized rubber sheet, and a cog molding die, for explaining a modified example of the laminated body forming step. FIG. 20 is a view for explaining a modified example of the laminated body forming process, and schematically shows a state in which a cog portion is formed on an unvulcanized rubber sheet after being molded on the surface of the cog molding die. It is sectional drawing. FIG. 21 is a view for explaining a modified example of the laminated body forming step, and schematically showing a partial cross section in a state where an endless laminated body is formed on the outer periphery of the mold. FIG. 22 is a view for explaining a belt molded body forming step performed after the laminated body forming step shown in FIGS. 19 to 21 is performed, and the outer periphery of the endless laminated body is formed on the outer periphery of the mold. It is a figure which shows typically the state by which the some unvulcanized rubber sheet was further laminated | stacked.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. In the following description, first, a transmission belt according to an embodiment of the present invention will be described, and then a method for manufacturing the transmission belt will be described.

[Schematic configuration of transmission belt]
FIG. 1 is a diagram showing the overall shape of a transmission belt 1 according to an embodiment of the present invention. FIG. 2 is a cross-sectional perspective view showing a part of the transmission belt 1. FIG. 3 is a cross-sectional view showing a part of the transmission belt 1. The power transmission belt 1 shown in FIGS. 1 to 3 is used as an endless belt for power transmission in a drive mechanism in a motorcycle or general industrial machinery field. For example, the transmission belt 1 is used as a low edge V belt (transmission belt) used in a continuously variable transmission.

As shown in FIGS. 1 to 3, the transmission belt 1 includes a reinforcing cloth layer 11, a compressed rubber layer 12, an adhesive rubber layer 13, a core body 16, an extended rubber layer 14, and an upper surface reinforcing cloth 15. .

The transmission belt 1 has a laminated structure, and a reinforcing cloth layer 11, a compression rubber layer 12, an adhesive rubber layer 13, an extension rubber layer 14, and an upper surface reinforcing cloth 15 are sequentially formed from the inner peripheral side to the outer peripheral side of the belt. Are stacked. The cross-sectional shape in the belt width direction is a trapezoidal shape in which the belt width decreases from the belt outer peripheral side toward the inner peripheral side. Further, a core body 16 is embedded in the adhesive rubber layer 13.

[Compressed rubber layer]
The compression rubber layer 12 is disposed on the inner peripheral side of the transmission belt 1 and is provided as a rubber layer extending along the belt longitudinal direction that is the circumferential direction of the transmission belt 1. Examples of the rubber component constituting the compressed rubber layer 12 include vulcanizable or crosslinkable rubbers such as diene rubbers (natural rubber, isoprene rubber, butadiene rubber, chloroprene rubber, styrene butadiene rubber, acrylonitrile butadiene rubber (nitrile rubber), Hydrogenated nitrile rubber, etc.), ethylene-α-olefin elastomer, chlorosulfonated polyethylene rubber, alkylated chlorosulfonated polyethylene rubber, epichlorohydrin rubber, acrylic rubber, silicone rubber, urethane rubber, fluororubber, etc. The rubber components can be used alone or in combination of two or more. Preferred rubber components are ethylene-α-olefin elastomers (ethylene-α-olefin rubbers such as ethylene-propylene copolymer (EPM), ethylene-propylene-diene terpolymer (EPDM)), and chloroprene rubber. . A particularly preferred rubber component is chloroprene rubber. The chloroprene rubber may be a sulfur-modified type or a non-sulfur-modified type.

The longitudinal direction of the belt is indicated by a double-ended arrow A in FIGS. 2 is a cross section in the belt width direction, which is a direction orthogonal to the belt longitudinal direction. The belt width direction is indicated by a double-ended arrow B in FIG. Further, the cross section shown in FIG. 3 is a cross section in the belt longitudinal direction.

[Adhesive rubber layer]
The adhesive rubber layer 13 is formed of a rubber composition containing a rubber component. A core body 16 is embedded in the adhesive rubber layer 13 so as to extend in the longitudinal direction of the belt. Usually, the core wire forming the core body 16 is parallel to the longitudinal direction of the belt (spiral) in parallel at a predetermined pitch. (In other words, they are embedded in the belt width direction at a predetermined pitch).

As the core wire, usually a twisted cord using multifilament yarn (for example, various twists, single twists, rung twists, etc.) can be used. As fibers constituting the core wire, synthetic fibers such as polyester fibers and aramid fibers, inorganic fibers such as glass fibers and carbon fibers, and the like can be used. Conventional adhesion treatment (or surface treatment) may be applied to the surface of the core wire. The rubber component of the adhesive rubber layer 13 can be selected from the types described in the section of the compressed rubber layer 12. As the rubber component, the same type or the same type of rubber as the rubber component of the compressed rubber layer 12 is often used. The adhesive rubber layer 13 is an optional element and can be omitted.

[Stretch rubber layer]
The stretch rubber layer 14 is disposed on the outer peripheral side of the adhesive rubber layer 13 and is provided as a rubber layer extending along the belt longitudinal direction. The rubber component constituting the stretched rubber layer 14 can be selected from the types described in the section of the compressed rubber layer 12. As the rubber component, the same type or the same type of rubber as the rubber component of the compressed rubber layer 12 is often used.

[Cog section]
Further, the transmission belt 1 is provided with a cog 18 provided at least on the compressed rubber layer 12. The cog portion 18 is provided as a portion on the inner peripheral side of the compressed rubber layer 12. The cog portion 18 is configured as a portion in which cog mountains 18 a and cog valleys 18 b are alternately arranged along the belt longitudinal direction that is the circumferential direction of the transmission belt 1.

FIG. 4 is a cross-sectional view showing a part of the cog 18. The cross section shown in FIG. 4 is a cross section in the belt longitudinal direction. As shown in FIGS. 1 to 4, the cog crests 18 a and the cog valleys 18 b are alternately arranged along the belt longitudinal direction of the transmission belt 1 over the entire circumference of the inner circumferential side portion of the compressed rubber layer 12. Is provided. Each cog mountain 18a is provided as a protruding portion protruding in a mountain shape on the inner peripheral side in the compressed rubber layer 12. In addition, each cog valley 18b is provided as a curved portion that is recessed in a valley shape from the inner peripheral side toward the outer peripheral side in the compressed rubber layer 12. That is, the cog mountain 18a is configured as a region other than the cog valley 18b configured as a curved surface portion (curved portion) recessed in a valley shape in the cog portion 18. In the present embodiment, referring to FIG. 4, the region of the cog mountain 18a is defined as a region Z1 up to 90% of the cog depth d (height) in the belt thickness direction with the top of the cog mountain 18a as a reference. To do. In FIG. 4, with respect to the cog mountain 18 a and the cog valley 18 b arranged adjacent to each other, the boundary between the region of the cog mountain 18 a and the region of the cog valley 18 b is illustrated by a broken line.

[Top reinforcement fabric]
The upper surface reinforcing cloth 15 is provided as a reinforcing cloth that is bonded to the outer peripheral surface of the stretch rubber layer 14 and covers the surface of the stretch rubber layer 14. Thereby, the upper surface reinforcement cloth 15 is provided so that the outer periphery of the transmission belt 1 may be covered along a belt longitudinal direction. The upper surface reinforcing fabric 15 is made of, for example, a woven fabric, and a fiber such as cotton, PET (polyethylene terephthalate), nylon, or aramid is used as the material of the woven fabric. The upper surface reinforcing cloth 15 is an optional element and can be omitted.

[Reinforcing fabric layer]
The reinforcing fabric layer 11 is provided as a layer that covers the surface of the compressed rubber layer 12 by being adhered to the surface of the compressed rubber layer 12 on the inner peripheral side. Thereby, the reinforcing fabric layer 11 is provided so as to cover the inner periphery of the transmission belt 1 along the belt longitudinal direction. The reinforcing cloth layer 11 is bonded to the surfaces of the cog mountain 18a and the cog valley 18b.

The reinforcing cloth layer 11 includes at least one reinforcing cloth 19 that covers the surface of the cog portion 18 along the belt longitudinal direction of the transmission belt 1. In this embodiment, the power transmission belt 1 including the reinforcing cloth layer 11 including only one reinforcing cloth 19 is illustrated. In addition, not only the form illustrated by this embodiment but the form of the reinforcement cloth layer provided with two or more laminated | stacked reinforcement cloth 19 may be implemented.

The reinforcing cloth 19 is disposed over the entire circumference of the surface of the cog 18 along the longitudinal direction of the transmission belt 1 and is adhered to the surfaces of the cog mountain 18a and the cog valley 18b. The reinforcing cloth 19 is configured using a continuous woven cloth with no joints. And the reinforcement cloth 19 is produced in the reinforcement cloth preparation process containing a cutting process, an adhesive liquid immersion process, a wide-angle process process, and a drying process so that it may mention later. In addition, as will be described later, the reinforcing cloth manufacturing step is configured as a step in the method for manufacturing the transmission belt.

As a material constituting the reinforcing cloth 19, for example, fibers such as cotton, PET (polyethylene terephthalate), nylon, and aramid are used. In the reinforcing cloth 19, these fibers may be used alone or in combination.

Further, the reinforcing cloth 19 bonded to the surface of the cog 18 is joined at both ends only by one joint 20 in the belt longitudinal direction. That is, as well shown in FIG. 1, the joint 20 that joins both ends of the reinforcing fabric 19 is provided at only one place in the belt longitudinal direction.

Moreover, the joining part 20 is provided as a part joined by bonding in a state where both ends of the reinforcing cloth 19 are overlapped. FIG. 4 is a cross-sectional view showing a part of the cog 18 at a position corresponding to the joint 20. The joint portion 20 that joins both ends of the reinforcing fabric 19 is disposed at a position corresponding to one cog mountain 18a (in other words, a region indicated by Z1 with reference to FIG. 4). That is, the joining part 20 is arrange | positioned in places other than the cog valley 18b comprised by a curved surface. And the junction part 20 is provided so that it may extend substantially linearly along the belt width direction which is a direction orthogonal to a belt longitudinal direction. That is, the part where both ends of the reinforcing cloth 19 are overlapped and joined is provided so as to extend substantially linearly along the belt width direction. In addition, although the junction part 20 should just be provided in the cog mountain 18a (namely, area | region Z1), it is more preferable to be provided in the area | region Z2 to 50% of the cog depth d (height).

[Production method of transmission belt]
Next, the manufacturing method of the transmission belt 1 which is a low edge V belt based on the said embodiment is demonstrated. FIG. 5 is a chart showing a method for manufacturing the transmission belt 1. As shown in FIG. 5, the manufacturing method of the transmission belt 1 includes a reinforcing cloth manufacturing step S101, a laminated body forming step S102, a belt molded body forming step S103, a vulcanizing step S104, and a V cut step S105. It is prepared for. When the transmission belt 1 is manufactured, first, the reinforcing cloth manufacturing step S101 is performed, then the laminated body forming step S102 is performed, then the belt molded body forming step S103 is performed, and then the additional processing is performed. Sulfurization step S104 is performed, and finally, V cut step S105 is performed, and transmission belt 1 is manufactured.

[Reinforcing fabric production process]
FIG. 6 is a chart showing the reinforcing fabric manufacturing step S101. The reinforcing cloth manufacturing step S101 is configured as a process of manufacturing the reinforcing cloth 19 composed of a continuous cloth without a joint. As shown in FIG. 6, the reinforcing cloth manufacturing step S 101 includes a cutting step S 201, an adhesive liquid immersion step S 202, a wide-angle processing step S 203, and a drying step S 204.

FIG. 7 is a diagram for explaining the cutting step S201 and is a schematic diagram showing a part of the bag woven fabric 21. FIG. In the cutting step S201, the plain-woven bag woven fabric 21 is cut. The bag woven fabric 21 is configured as a tubular woven fabric formed by weaving warps 22a and wefts 22b. In the bag woven fabric 21, the warp yarn 22a extends along the cylindrical axial direction, and the weft yarn 22b extends along the cylindrical circumferential direction. In FIG. 7, the warp yarn 22a and the weft yarn 22b are schematically shown. Examples of the fibers constituting the warp 22a and the weft 22b include fibers such as cotton, PET (polyethylene terephthalate), nylon, and aramid. In addition, these fibers may be used independently or may be used in combination of 2 or more types.

In the cutting step S201, the bag woven fabric 21 is spirally cut with respect to the cylindrical axial direction. That is, the bag fabric 21 is cut along a direction that is oblique to the cylindrical axial direction and along a direction that is also oblique to the cylindrical circumferential direction. In addition, in FIG. 7, the cutting line 23 when the bag fabric 21 is cut | disconnected spirally is shown with the dashed-dotted line and the broken line. A cutting line 23 shown by a one-dot chain line shows a cutting line appearing on the front side in the drawing, and a cutting line 23 shown by a broken line schematically shows a cutting line appearing on the back side in the drawing.

The bag fabric 21 is spirally cut along the cutting line 23. The cutting line 23 is set, for example, at an angle inclined by 45 degrees with respect to the direction in which the warp yarn 22a extends. FIG. 8 is a schematic view showing a part of the belt-like cloth 24 produced by cutting the bag woven cloth 21 into a spiral shape in the cutting step S201.
The belt-like cloth 24 is configured as a continuous woven cloth with no joints. Further, the belt-like cloth 24 is configured as a woven cloth in which the warp yarns 22 a and the weft yarns 22 b extend obliquely with respect to the longitudinal direction of the belt-like cloth 24. For example, the belt-like cloth 24 is configured as a woven cloth in which the warp 22a and the weft 22b extend in a direction of 45 degrees with respect to the longitudinal direction of the belt-like cloth 24. That is, the belt-like cloth 24 is configured as a woven cloth in which the warp yarn 22a and the weft yarn 22b intersect at an angle of 90 degrees.

After the cutting step S201 is completed and the belt-like cloth 24 is manufactured, an adhesive liquid immersion step S202 is then performed. In the adhesive liquid immersing step S202, the continuous continuous belt-like cloth 24 produced in the cutting step S201 is immersed in the adhesive liquid. As this adhesive liquid, for example, RFL (Resorcinol Formatde Latex), rubber glue, epoxy resin, or the like is used. These may be used alone or in combination.

In the wide-angle treatment step S203, the belt-like cloth 24 to which the adhesive liquid has been adhered through the adhesive liquid immersion step S202 is stretched in the width direction of the belt-like cloth 24 so that the length in the longitudinal direction of the belt-like cloth 24 is shortened. A wide angle process is performed in which the crossing angle between the warp yarn 22a and the weft yarn 22b is increased. The width direction of the belt-like cloth 24 is a direction orthogonal to the longitudinal direction of the belt-like cloth 24. The intersecting angle between the warp yarn 22a and the weft yarn 22b is an angle formed by the intersecting warp yarn 22a and the weft yarn 22b, and is opened when viewed from the longitudinal direction of the belt-like fabric 24, not from the width direction of the belt-like fabric 24. Side angle. In FIG. 8, the crossing angle between the warp yarn 22a and the weft yarn 22b of the belt-like cloth 24 is shown with a sign of an angle θ1 (the same applies to FIG. 9).

FIG. 9 is a diagram for explaining the wide-angle processing step S203 and is a schematic diagram showing a part of the belt-like cloth 24 and the wide-angle woven cloth 25. The wide-angle woven fabric 25 is manufactured by performing a wide-angle treatment on the belt-like cloth 24 in a state where the adhesive liquid is adhered to reduce the length and extend in the width direction to widen the crossing angle between the warp 22a and the weft 22b. . The wide-angle woven fabric 25 is a continuous woven fabric with no joints, and is configured as a woven fabric in which the crossing angle of the warp yarn 22a and the weft yarn 22b is larger than that of the belt-like fabric 24. In FIG. 9, a state in which the wide-angle treatment is performed on the belt-like cloth 24 and the wide-angle woven cloth 25 is produced from the belt-like cloth 24 is schematically shown. The crossing angle between the warp yarn 22a and the weft yarn 22b of the wide-angle woven fabric 25 is an angle formed by the warp yarn 22a and the weft yarn 22b intersected in the wide-angle woven fabric 25, and is not seen from the width direction of the wide-angle woven fabric 25. This is the angle on the open side when viewed from the longitudinal direction of the wide-angle woven fabric 25. In FIG. 9, the crossing angle between the warp yarn 22a and the weft yarn 22b of the wide-angle woven fabric 25 is shown with a symbol of an angle θ2.

In the state of the belt-like cloth 24 before the wide angle processing is performed, the crossing angle between the warp 22a and the weft 22b is set to 90 degrees. On the other hand, the crossing angle between the warp yarn 22a and the weft yarn 22b of the wide-angle woven fabric 25 produced by performing the wide-angle treatment is set to 120 to 140 degrees. The crossing angle is more preferably in the range of 130 degrees to 140 degrees. By setting the crossing angle between the warp yarn 22a and the weft yarn 22b from 120 degrees to 140 degrees in the state of the wide-angle woven cloth 25, the reinforcing cloth 19 is produced as the transmission belt 1 through the final vulcanization step S104. The crossing angle between the warp yarn 22a and the weft yarn 22b is 110 to 130 degrees. The crossing angle is more preferably in the range of 120 degrees to 130 degrees. The crossing angle between the warp yarn 22a and the weft yarn 22b of the reinforcing cloth 19 is an angle formed by the warp yarn 22a and the weft yarn 22b intersecting with each other in the reinforcing cloth 19, and is not seen from the width direction of the reinforcing cloth 19 but the reinforcing cloth 19 It is the angle of the open side when viewed from the longitudinal direction of

In the wide-angle treatment, the belt-like cloth 24 is stretched in the width direction so that the shrinkage rate, which is the ratio of the length of the belt-like cloth 24 before and after the wide-angle treatment, falls within a predetermined range. The shrinkage rate is calculated by the following equation by marking a predetermined range in the length direction of the woven fabric before the wide-angle treatment, measuring the dimensions of the predetermined range of the woven fabric before and after the wide-angle treatment. The shrinkage rate is preferably in the range of 20% to 40%, and more preferably in the range of 30% to 40%.
Shrinkage rate = {(dimension in length direction of woven fabric (band-like fabric 24) before wide-angle treatment−dimension in length direction of woven fabric after wide-angle treatment (wide-angle woven fabric 25)) / woven fabric before wide-angle treatment ( Dimension in the length direction of the belt-like cloth} × 100 (%)

When the crossing angle between the warp yarn 22a and the weft yarn 22b in the reinforcing fabric 19 is smaller than 110 degrees, the reinforcing fabric 19 itself becomes difficult to extend, and it becomes difficult for the reinforcing fabric 19 to sufficiently expand and contract following the bending of the transmission belt 1. . For this reason, if the crossing angle is smaller than 110 degrees, cracks are likely to occur in the cog valley 18b. On the other hand, there is a limit to the intersection angle between the warp yarn 22a and the weft yarn 22b that can be subjected to the wide-angle treatment in the wide-angle treatment step S203, and it is difficult to produce the wide-angle woven fabric 25 with the intersection angle exceeding 140 degrees. For this reason, it is difficult to produce the reinforcing fabric 19 in which the crossing angle between the warp 22a and the weft 22b exceeds 130 degrees. As described above, the crossing angle between the warp yarn 22a and the weft yarn 22b in the reinforcing fabric 19 is preferably set in the range of 110 degrees to 130 degrees.

In the drying step S204, the seamless wide-angle woven fabric 25 produced by widening the crossing angle between the warp yarn 22a and the weft yarn 22b of the belt-like fabric 24 in the wide-angle treatment step S203 is dried. The wide-angle woven fabric 25 is subjected to the wide-angle treatment while the adhesive liquid is adhered, and the adhesive liquid adhered to the wide-angle woven fabric 25 is cured in the drying step S204. As a result, the warp yarn 22a and the weft yarn 22b of the wide-angle woven fabric 25 are cured with the adhesive liquid being cured while the crossing angle between the warp yarn 22a and the weft yarn 22b is widened by the wide-angle treatment and the state is maintained. Is done. That is, the crossing angle between the warp yarn 22a and the weft yarn 22b is widened by the wide angle processing, and the crossing angle is fixed while the state is maintained.

FIG. 10 is a schematic diagram of an apparatus layout of the production line 26 that executes each process in the adhesive liquid immersion step S202, the wide-angle processing step S203, and the drying step S204. In the production line 26 having a plurality of transport rolls, the belt-like cloth 24 produced in the cutting step S201 is subjected to each process while being transported and sent out by the plurality of transport rolls, and then passes through the state of the wide-angle woven fabric 25. Then, the reinforcing cloth 19 of the transmission belt 1 is produced.

The production line 26 includes an adhesive liquid tank 27 for storing the adhesive liquid 28 used in the adhesive liquid immersion step S202. As the adhesive liquid 28, for example, RFL is used. The belt-like cloth 24 is immersed in the adhesive liquid 28 stored in the adhesive liquid tank 27 while being wound around and conveyed by a plurality of conveyance rolls. That is, the belt-like cloth 24 is immersed in the adhesive liquid 28 in the adhesive liquid tank 27 in the process of being wound around and conveyed by a plurality of transport rolls arranged in the adhesive liquid tank 27. Thereby, adhesive liquid immersion process S202 is performed.

The belt-like cloth 24 immersed in the adhesive liquid 28 in the adhesive liquid tank 27 is then conveyed out of the adhesive liquid tank 27. Then, the belt-like cloth 24 is sent to the wide-angle processing device 29 while being wound around and conveyed by a plurality of conveyance rolls with the adhesive liquid attached thereto, and is conveyed on the wide-angle processing device 29.

FIG. 11 is a schematic diagram showing the wide-angle processing device 29. The wide-angle processing device 29 is provided as a device that executes the wide-angle processing step S203, and includes a pair of transport mechanisms (29a, 29b). The pair of transport mechanisms (29a, 29b) are disposed on both sides in the width direction of the belt-like cloth 24 and the wide-angle woven cloth 25, and are provided as a mechanism for carrying the belt-like cloth 24 and the wide-angle woven cloth 25 while performing wide-angle processing. .

Each transport mechanism (29a, 29b) is provided as an endless transport mechanism that circulates in the direction indicated by arrow C in FIG. And a pair of conveyance mechanism (29a, 29b) is comprised so that the both ends of the width direction of the strip | belt-shaped cloth 24 and the wide-angle woven cloth 25 can be hold | maintained. More specifically, each transport mechanism (29a, 29b) is provided with a plurality of pins 29c protruding upward. Each pin 29c is arranged at a position where it can pierce the belt-like cloth 24 and the wide-angle woven cloth 25 at the end in the width direction of the belt-like cloth 24 and the wide-angle woven cloth 25.

When each transport mechanism (29a, 29b) circulates in the direction of arrow C in the figure, each pin 29c also circulates in the direction of arrow C in the figure. And in each conveyance mechanism (29a, 29b), the pin 29c arrange | positioned under the strip | belt-shaped cloth 24 and the wide-angle woven cloth 25 among the some pins 29c pierces the strip-shaped cloth 24 and the wide-angle woven cloth 25. Thereby, the both ends of the width direction of the strip | belt-shaped cloth 24 and the wide-angle woven cloth 25 are hold | maintained by a pair of conveyance mechanism (29a, 29b). Each transport mechanism (29a, 29b) is provided so as to extend in the width direction of the strip-shaped cloth 24 and the wide-angle woven cloth 25 toward the downstream side in the transport direction for transporting the strip-shaped cloth 24 and the wide-angle woven cloth 25. Yes.

When the belt-like cloth 24 is conveyed to the upstream side of the wide-angle processing device 29 by a plurality of conveyance rolls with the adhesive liquid attached, the wide-angle processing device is pressed by the pressing roll 30 disposed above the belt-like cloth 24. 29. Thereby, the pin 29c arrange | positioned under the strip | belt-shaped cloth 24 and the wide-angle woven cloth 25 in each conveyance mechanism (29a, 29b) pierces the strip-shaped cloth 24 and the wide-angle woven cloth 25. And the both ends of the width direction of the strip | belt-shaped cloth 24 and the wide-angle woven cloth 25 are hold | maintained by a pair of conveyance mechanism (29a, 29b).

The pair of transport mechanisms (29a, 29b) extends the belt-like cloth 24 and the wide-angle woven fabric 25 in the width direction while reducing the length thereof while holding both ends of the belt-like cloth 24 and the wide-angle woven fabric 25. While conveying in the longitudinal direction. In FIG. 11, an arrow D indicates a direction in which the belt-like cloth 24 and the wide-angle woven cloth 25 are conveyed along the longitudinal direction (hereinafter also simply referred to as “conveying direction”).

The production line 26 uses a pair of transport mechanisms (29a, 29b) to feed the belt-like cloth 24 in the carrying direction when the pins 29c move in the width direction of the belt-like cloth 24 and the wide-angle woven cloth 25 in the carrying direction. Is made faster than the speed component in the transport direction at the moving speed of the pin 29c. Thereby, the production line 26 is configured such that the belt-like cloth 24 expands in the width direction and contracts in the longitudinal direction, and the crossing angle between the warp yarn 22a and the weft yarn 22b is widened.

As described above, the belt-like cloth 24 is expanded in the width direction and contracted in the longitudinal direction, the crossing angle between the warp yarn 22a and the weft yarn 22b is increased, and the wide-angle woven fabric 25 is produced. When the wide-angle woven fabric 25 is produced, the wide-angle woven fabric 25 is conveyed to the drying furnace 32 on the downstream side in the conveyance direction by the conveyance mechanism (29a, 29b). The wide-angle woven fabric 25 passes through the drying furnace 32 while being transported by the transport mechanism (29a, 29b). The transport mechanism (29a, 29b) is provided so as to extend to the outlet of the drying furnace 32. In the vicinity of the outlet of the drying furnace 32, a push-up roll 31 is disposed above the wide-angle processing device 29. When the wide-angle woven fabric 25 passes through the drying furnace 32, the wide-angle woven fabric 25 is pushed upward by a push-up roll 31 disposed below the wide-angle woven fabric 25 on the downstream side in the transport direction with respect to the drying furnace 32. Thereby, the wide-angle woven fabric 25 is pulled away from the pin 29c.

The wide-angle woven fabric 25 sent out from the wide-angle processing device 29 after the wide-angle processing step S203 is carried is conveyed to the drying furnace 32. The drying furnace 32 is provided as a furnace for performing the drying step S204. The wide-angle woven fabric 25 produced by performing the wide-angle treatment with the adhesive liquid attached is dried when being conveyed through the drying furnace 32. Thereby, the adhesive liquid is cured. Then, the crossing angle between the warp yarn 22a and the weft yarn 22b is widened by the wide-angle treatment, and the crossing angle is fixed by the hardening of the adhesive liquid while the state is maintained.

After the drying step S204 in the drying furnace 32 is completed, the reinforcing cloth 19 is produced. The reinforcing cloth 19 is cut to a length necessary for constituting the reinforcing cloth layer 11 of the transmission belt 1 and used as the reinforcing cloth 19 in the reinforcing cloth layer 11. Further, when the reinforcing cloth 19 is cut to a necessary length, the reinforcing cloth 19 is cut substantially linearly along the width direction of the reinforcing cloth 19 which is a direction orthogonal to the longitudinal direction of the reinforcing cloth 19.

Here, the preferable conditions in the above-described reinforcing cloth manufacturing step S101 will be further described. The bag woven fabric 21 used for the production of the belt-like fabric 24 preferably has a yarn density of 35 to 75 yarns / 5 cm from the viewpoint of easily expanding the crossing angle between the warp yarn 22a and the weft yarn 22b during the wide-angle treatment. That is, the bag woven fabric 21 includes 35 to 75 warps 22a per 5 cm along the cylindrical circumferential direction, and 35 to 75 wefts 22b per 5 cm along the cylindrical axial direction. It is preferable to use one having a density.

If the yarn density is too high, the yarn interval becomes narrow and the yarn becomes difficult to move. On the other hand, as the yarn density decreases and the yarn interval increases, the yarn becomes easier to move, so that the crossing angle between the warp yarn 22a and the weft yarn 22b is easily increased during the wide angle processing. However, if the yarn density is too small, the number of yarns per unit width or unit length of the woven fabric is reduced, so that the strength of the woven fabric is reduced. Therefore, by setting the yarn density of the bag woven fabric 21 to 35 to 75 pieces / 5 cm, wide-angle processing can be easily performed while sufficiently securing the strength of the woven fabric.

Moreover, as a material of the material of the bag woven fabric 21, it is preferable to use a material containing fibers that are less likely to shrink due to heat from the viewpoint of reducing the shrinkage of the woven fabric in the width direction due to heat in the drying step S204. . In particular, since cotton has a small fiber elongation, it is preferable to use a material containing cotton as the material of the bag woven fabric 21.

As the adhesive liquid used in the adhesive liquid immersion step S202, it is preferable to use RFL or an epoxy-based adhesive treatment agent, and it is particularly preferable to use RFL in which an initial compound of resorcin and formalin and rubber latex are mixed. By using RFL as the adhesive liquid, the adhesive liquid adhering to the wide-angle woven fabric 25 is efficiently cured in the drying step S204 for the wide-angle woven cloth 25 that has been subjected to the wide-angle processing in the wide-angle processing step S203. Can be stopped. RFL is also preferable because it is widely used as an adhesive solution.

Further, the solid content concentration of the adhesive used in the adhesive immersion step S202 is preferably in the range of 2 to 26% by mass. If the solid content concentration is too low outside the above range, the wide-angle woven fabric 25 subjected to the wide-angle treatment in the wide-angle treatment step S203 is likely to be insufficiently sealed, and the reinforcing cloth 19 and the compressed rubber layer 12 Adhesion with rubber tends to be insufficient. Further, if the solid content concentration is too high outside the above range, the woven fabric becomes tough due to the curing of the adhesive liquid, and the flexibility of the transmission belt 1 tends to be lowered.

In the wide-angle processing step S203, as described above, the pin 29c that holds both ends in the width direction of the belt-like cloth 24 spreads in the width direction, so that the belt-like cloth 24 extends in the width direction, and the feeding speed of the belt-like cloth 24 is increased. Is made faster than the speed component in the conveying direction in the moving speed of the pin 29c, the belt-like cloth 24 is contracted in the length direction, and the crossing angle between the warp 22a and the weft 22b is increased. Therefore, in order to set the crossing angle between the warp yarn 22a and the weft yarn 22b to a target angle (120 to 140 degrees), the expansion rate in the width direction of the belt-like cloth 24, the feed speed of the belt-like cloth 24, and the pin 29c It is necessary to optimize the moving speed.

The expansion ratio in the width direction of the belt-like cloth 24 can be changed by adjusting the distance between the pin 29c of the transport mechanism 29a and the pin 29c of the transport mechanism 29b, and the ratio of the width dimension of the woven cloth before and after the wide-angle processing. It can be calculated by That is, it can be calculated by the following equation.
Elongation rate = width of wide-angle woven fabric 25 ÷ width of strip-like fabric 24 × 100 (%)

The expansion rate calculated by the above formula is preferably set to be 105 to 140%, and more preferably set to be in the range of 130 to 140%. The feeding speed of the belt-like cloth 24 is preferably set in a range of 1.5 to 2.5 times the speed component in the transport direction at the moving speed of the pin 29c. The crossing angle between the warp yarn 22a and the weft yarn 22b of the wide-angle woven fabric 25 produced by performing the wide-angle processing can be set from the target 120 degrees to 140 degrees according to the above-described stretch rate condition and speed condition. As described above, the crossing angle between the warp yarn 22a and the weft yarn 22b in the state of the wide-angle woven fabric 25 is set from 120 degrees to 140 degrees, so that the power transmission belt 1 is manufactured through the final vulcanization step S104. In this state, the crossing angle between the warp yarn 22a and the weft yarn 22b in the reinforcing fabric 19 is 110 degrees to 130 degrees.

In the drying step S204, the wide-angle woven fabric 25 that has been subjected to the wide-angle treatment is dried to a certain high temperature, whereby the adhesive liquid attached to the wide-angle woven fabric 25 is cured, and the warp yarn 22a and the weft 22b spread by the wide-angle treatment. Crossing angle can be fixed. However, if the drying temperature is too high, the woven fabric will be deteriorated by heat. On the other hand, when the drying temperature is low to some extent, shrinkage in the width direction of the wide-angle woven fabric 25 due to heat can be reduced. However, if the drying temperature is too low, the adhesive liquid is not sufficiently cured, and the fixing (sealing) of the crossing angle between the warp 22a and the weft 22b becomes insufficient. From the above viewpoint, it is preferable that the drying temperature is set to 100 to 160 ° C. in the drying step S204. As a result, the crossing angle between the warp yarn 22a and the weft yarn 22b can be fixed (sealed), deterioration of the woven fabric due to heat can be prevented, and shrinkage in the width direction of the wide-angle woven fabric 25 can also be suppressed. .

When the drying step S204 is completed, the reinforcing cloth production step S101 is completed. After that, before the laminated body forming step S102 is performed, the reinforcing cloth produced in the reinforcing cloth production step S101 is performed as necessary. A treatment for improving the adhesion between the compression rubber layer 19 and the compressed rubber layer 12 may be performed. Specifically, in order to improve the adhesion between the reinforcing cloth 19 and the compressed rubber layer 12, a process of attaching rubber to the reinforcing cloth 19 may be performed. As this process, for example, a process of immersing the reinforcing cloth 19 in rubber paste is performed. Alternatively, a process of rubbing rubber into the reinforcing cloth 19 is performed. Alternatively, a process of laminating a thin rubber sheet on the reinforcing cloth 19 is performed.

[Laminated body forming step]
12 to 16 are diagrams for explaining the stacked body forming step S102. FIG. 12 is a schematic diagram showing a state in which the reinforcing cloth 19 is wound around the outer periphery of the mold 33. FIG. 13 is a view for explaining a process of winding the reinforcing cloth 19 around the outer periphery of the mold 33. FIG. 14 is a cross-sectional view schematically showing a part of the outer periphery of the mold 33 and a part of the reinforcing cloth 19 wound around the outer periphery of the mold 33. FIG. 15 is a diagram schematically showing a state in which an unvulcanized rubber sheet 35 of the material of the compressed rubber layer 12 is disposed on the outer periphery of the mold 33 around which the reinforcing cloth 19 is wound. In FIG. 16, the endless laminate 37 in which the reinforcing cloth 19 and the unvulcanized rubber sheet 35 are laminated and the cog portion 18 is provided on the unvulcanized rubber sheet 35 is formed on the outer periphery of the mold 33. FIG. 15 and 16, the reinforcing fabric 19 and the unvulcanized rubber sheet 35 are illustrated in cross section, and the mold 33 is illustrated in outline.

In the laminated body forming step S102, the reinforcing cloth layer 11 including the reinforcing cloth 19 and the unvulcanized rubber sheet 35 for the compressed rubber layer 12 are laminated, and the unvulcanized rubber sheet 35 has a cog mountain 18a and a cog valley 18b. Are formed as a step of forming an endless laminated body 37 provided with the cog portions 18 alternately arranged. In the laminated body forming step S102, the reinforcing cloth 19 is placed around the outer periphery of the mold 33 as shown in FIG. The mold 33 is configured, for example, as a mold in which grooves 33a and ridges 33b are alternately arranged on the outer periphery of a cylindrical main body.

The groove portion 33 a is provided as a groove-like portion recessed inward on the outer periphery of the mold 33, and is provided so as to extend along the axial direction of the mold 33. The crest 33 b is provided as a crest-like portion protruding outward on the outer periphery of the mold 33, and is provided so as to extend along the axial direction of the mold 33. In the state where the laminated body 37 in which the reinforcing cloth 19 and the unvulcanized rubber sheet 35 are laminated and the cog portion 18 is provided is formed on the outer periphery of the mold 33, the groove portion 33a corresponds to the cog mountain 18a. The part 33b corresponds to the cog valley 18b. That is, the groove part 33a forms the cog mountain 18a, and the mountain part 33b forms the cog valley 18b.

When the reinforcing cloth 19 (reinforcing cloth layer 11) is wound around the outer periphery of the mold 33, for example, a pinion roll 34 shown in FIG. 13 is used. The pinion roll 34 is configured as a roll having a plurality of teeth 34a on the outer periphery. In the pinion roll 34, each tooth 34a is provided, for example, in a pin shape protruding toward the radially outer side of the pinion roll 34.

The mold 33 and the pinion roll 34 are arranged in a state where the axial directions are set parallel to each other. The mold 33 and the pinion roll are disposed in a state where the reinforcing cloth 19 is disposed along the outer periphery of the mold 33 and the teeth 34 a of the pinion roll 34 can be engaged with the groove 33 a of the mold 33. 34 are rotated in opposite directions. In this way, when the mold 33 and the pinion roll 34 rotate in opposite directions, the reinforcing cloth 19 is sequentially pushed into the groove 33a by the teeth 34a. Thereby, as shown in FIG. 12, the reinforcing cloth 19 is wound around the outer periphery of the mold 33 in a state of being in close contact with the surface of the groove 33a and the surface of the peak 33b of the mold 33. The reinforcing cloth 19 is wound over the entire circumference of the mold 33, and the longitudinal direction of the reinforcing cloth 19 corresponding to the circumferential direction of the outer periphery of the mold 33 corresponds to the belt longitudinal direction of the transmission belt 1.

In addition, when the reinforcing cloth 19 is wound around the outer periphery of the mold 33, both ends in the longitudinal direction of the reinforcing cloth 19 overlap each other as shown in FIGS. It arrange | positions at the one groove part 33a. That is, the joint portion 20 that joins both ends of the reinforcing fabric 19 is disposed in one groove portion 33a. Further, the joint portion 20 is disposed so as to extend substantially linearly in the width direction of the reinforcing cloth 19 along the groove portion 33a. As described above, when the joint portion 20 is disposed in one groove portion 33 a, the joint portion 20 is disposed in one cog mountain 18 a in the cog portion 18 when the stacked body 37 is manufactured. Become.

When the reinforcing cloth 19 is placed around the outer periphery of the mold 33, then, as shown in FIG. 15, the raw material of the compressed rubber layer 12 is unvulcanized around the outer periphery of the mold 33 around which the reinforcing cloth 19 is wound. A rubber sheet 35 is disposed. The unvulcanized rubber sheet 35 is disposed along the outer periphery of the mold 33 so as to cover the entire periphery of the mold 33. Both ends of the unvulcanized rubber sheet 35 covering the outer periphery of the mold 33 are heated and pressurized and joined by the heating press 36 in a butted state.

When the unvulcanized rubber sheet 35 is disposed on the outer periphery of the mold 33 and both ends of the unvulcanized rubber sheet 35 are joined to each other, the mold in which the reinforcing cloth 19 and the unvulcanized rubber sheet 35 are disposed on the outer periphery. 33 is accommodated in a vulcanizing can (not shown) that is also used in the vulcanization step S104, and is molded. At this time, a rubber jacket serving as a steam blocking material is put on the outside of the mold 33 in which the reinforcing cloth 19 and the unvulcanized rubber sheet 35 are arranged on the outer periphery. The unvulcanized rubber sheet 35 covered with the jacket, the reinforcing cloth 19, and the mold 33 are accommodated inside the vulcanization can. And inside the vulcanizing can, the mold 33 in which the reinforcing cloth 19 and the unvulcanized rubber sheet 35 are arranged on the outer periphery and covered with the jacket is heated and further pressurized. Thereby, the unvulcanized rubber sheet 35 is molded with respect to the mold 33 in which the reinforcing cloth 19 is arranged on the outer periphery. As a result, as shown in FIG. 16, the reinforcing cloth layer 11 including the reinforcing cloth 19 and the unvulcanized rubber sheet 35 for the compressed rubber layer 12 are laminated, and the cog mountain 18 a and the unvulcanized rubber sheet 35 are An endless laminated body 37 provided with the cog portions 18 in which the cog valleys 18b are alternately arranged is formed.

And since the laminated body 37 is formed as mentioned above, in the laminated body formation process S102, the reinforcement cloth layer 11 is adhere | attached on the surface of the Kog mountain 18a and the Cog valley 18b in the laminated body 37. FIG. Further, in the laminated body forming step S 102, the reinforcing cloth 19 is arranged so as to cover the surface of the cog portion 18 along the circumferential direction of the laminated body 37 corresponding to the belt longitudinal direction of the transmission belt 1. In the laminated body forming step S102, the reinforcing cloth 19 is joined at both ends and at only one place in the belt longitudinal direction (circumferential direction). Moreover, in laminated body formation process S102, the junction part 20 which joins the both ends of the reinforcement cloth 19 is arrange | positioned in the position corresponding to one cog mountain 18a. Further, in the laminated body forming step S102, the joining portion 20 extends substantially linearly along the belt width direction (axial direction of the mold 33) that is a direction orthogonal to the belt longitudinal direction (circumferential direction). Placed in.

[Belt molded body forming process]
When the laminated body forming step S102 is completed and the laminated body 37 is formed, a belt molded body forming step S103 is then performed. The belt molded body forming step S103 is configured as a process of laminating other layers on the outer peripheral side of the laminated body 37 to form an unvulcanized belt molded body.

More specifically, in the belt molded body forming step S103, an unvulcanized rubber sheet (not shown) of the material of the adhesive rubber layer 13 is formed on the outer periphery of the laminated body 37 arranged in the outer periphery of the mold 33. A spirally spun core wire serving as the core body 16, an unvulcanized rubber sheet (not shown) of the material of the stretch rubber layer 14, and the upper surface reinforcing cloth 15 are laminated in this order. Thereby, an unvulcanized belt molding is formed.

[Vulcanization process]
When the belt molded body forming step S103 is completed, a vulcanizing step S104 is then performed. The vulcanization step S104 is configured as a step of vulcanizing the belt molded body formed in the belt molded body forming step S103. In the vulcanization step S104, the belt molded body is disposed on the outer periphery of the mold 33, and a rubber jacket as a steam blocking material is further covered on the outer side. The belt molded body and the mold 33 covered with the jacket are accommodated in a vulcanizing can (not shown). Then, the belt molded body is vulcanized inside the vulcanization can.

[V-cut process]
When the vulcanization step S104 is completed, a V-cut step S105 is performed. By performing the vulcanization step S104, the belt molded body is vulcanized and a belt sleeve is obtained. In the V-cut step S105, the belt sleeve produced in the vulcanization step S104 is cut in a V-shaped (trapezoidal) cross section perpendicular to the belt longitudinal direction along the belt longitudinal direction using a cutter or the like. Then, a process of cutting to a predetermined width is performed. By completing this V cut step S105, the manufacture of the transmission belt 1 is completed.

As described above, the transmission belt 1 is manufactured by carrying out the transmission belt manufacturing method shown in FIG. That is, the transmission belt 1 is manufactured by performing all the steps of the reinforcing cloth manufacturing step S101, the laminated body forming step S102, the belt molded body forming step S103, and the vulcanizing step S104.

[Example]
Next, examples (examples of the present invention) of the transmission belt 1 of the above-described embodiment will be described. As an example of the transmission belt 1 of the present embodiment, transmission belts according to Examples 1 to 27 manufactured by changing manufacturing conditions were manufactured. The transmission belts according to Examples 1 to 27 were manufactured by the manufacturing method of the present embodiment described above. For comparison with the transmission belts according to Examples 1 to 27, transmission belts according to three comparative examples, Comparative Example 1, Comparative Example 2, and Comparative Example 3, were also manufactured. Then, performance evaluation tests described later were performed on the transmission belts according to Comparative Example 1, Comparative Example 2, Comparative Example 3, and Examples 1 to 27.

Table 1 shows a list of manufacturing conditions and performance evaluation test results for the transmission belts according to Examples 1 to 7 and the transmission belts according to Comparative Examples (1, 2, 3). Table 2 shows the production conditions and performance evaluation test results of the transmission belts according to Examples 8 to 17 as a list. In addition, Table 3 shows a list of manufacturing conditions and performance evaluation test results for the transmission belts according to Examples 18 to 27.

In the transmission belt according to the comparative examples (1, 2, 3), a plain woven fabric was used as a material for the reinforcing fabric on the inner peripheral side. On the other hand, in the transmission belts according to Examples 1 to 27, a woven cloth (bag woven cloth) was used as a material for the reinforcing cloth. The warp and weft yarn densities of the reinforcing fabric in the transmission belts of the comparative examples (1, 2, 3) and Examples 1 to 27 are as shown in Tables 1 to 3. In Comparative Examples (1, 2, 3) and Examples 1 to 11, warps and wefts are made by blending cotton and PET and twisting two 20th yarns with a cotton count. Made up of yarn. The warps and wefts used in Examples 12 to 27 are as shown in Tables 2 and 3.

Tables 1 to 3 show the types of the adhesive liquid and the solid content concentration of the adhesive liquid used in the production of the reinforcing cloths of the transmission belts of the comparative examples (1, 2, 3) and Examples 1 to 27. As shown. “RFL” described in Tables 1 to 3 is an adhesive liquid obtained by mixing an initial condensate of resorcin and formalin and rubber latex, and “epoxy” described in Tables 1 to 3 is: It is the adhesive liquid of the epoxy adhesive which mixed the epoxy resin and the solvent. Incidentally, the drying temperature in the drying process for curing the adhesive liquid was set to 120 ° C. in any of Comparative Examples (1, 2, 3) and Examples 1 to 27.

Further, as described in Tables 1 to 3, the wide-angle treatment method for producing the reinforcing cloths of the transmission belts of Comparative Examples (1, 2, 3) and Examples 1 to 27 is “A-1 ”Or“ A-2 ”wide-angle processing method was used. Here, “A-1” is the wide-angle processing method performed on the plain woven fabric, and “A-2” is the wide-angle processing method used in the wide-angle processing step S203.

The wide angle processing method of “A-1” that widens the crossing angle between the warp and weft of the plain woven fabric was carried out by performing the following steps (1) to (3). (1) The plain woven fabric is immersed in an adhesive solution such as RFL, and the adhesive solution is attached to the plain woven fabric. (2) With the adhesive liquid attached, both ends in the width direction of the plain woven fabric are fixed with fixing pins, and the entire woven fabric is stretched while being bent in an oblique direction. The plain woven fabric is stretched by the difference in displacement amount between the outer peripheral side and the inner peripheral side. (3) The stretched plain woven fabric is dried to cure the adhesive liquid. By performing the steps (1) to (3), a plain woven fabric having a wide-angle crossing angle in which the warp is inclined with respect to the longitudinal direction of the woven fabric (the direction in which the warp extends) was obtained.

Further, the reinforcing cloth for the transmission belt according to the comparative example (1, 2, 3) was produced by cutting the plain woven cloth produced by the above-mentioned “A-1” wide-angle treatment method and joining them. . More specifically, a plurality of pieces of fabric cut from the plain woven fabric obtained by the wide-angle treatment method “A-1” in parallel with the center direction (bias direction) of the crossing angle of the warp and weft are prepared. The plurality of cloth pieces are continuously joined along the bias direction, thereby producing a reinforcing cloth (the reinforcing cloth of the transmission belt according to the comparative examples (1, 2, 3)) in which the bias direction is the longitudinal direction. did. For this reason, in the reinforcing cloth of the transmission belt according to the comparative example (1, 2, 3), a joint portion (hereinafter referred to as “bias joint”) extending obliquely with respect to the belt longitudinal direction (circumferential direction of the transmission belt). Are provided in at least one place. Further, the reinforcing cloth of the transmission belt according to the comparative example (1, 2, 3) is formed at both ends at a joint portion (hereinafter referred to as “right angle joint”) extending in the belt width direction orthogonal to the belt longitudinal direction. And joined.

Also, as shown in Table 1, in the transmission belt according to each comparative example (1, 2, 3), a bias joint and a right angle joint are provided as a joint portion of the reinforcing cloth. On the other hand, in the transmission belts according to Examples 1 to 27, no bias joint is provided, and only a right-angle joint that is a joint extending substantially linearly along the belt width direction is provided. The bias joints of the transmission belts according to the comparative examples (1, 2, 3) were arranged so as to extend over the cogs and cogs in the cogs. Moreover, the right-angle joint of the transmission belt which concerns on each comparative example (1, 2, 3) was arrange | positioned corresponding to a cog valley. On the other hand, the right angle joint in the reinforcing cloth of the transmission belt according to each of the examples (1, 2, 3) was disposed at a position corresponding to one cog mountain.

Further, as described in Tables 1 to 3, the coggs of the transmission belts according to Comparative Examples 1 and 3, and Examples 1, 3, 6, 9, 10, 12 to 17, 19, 22, 25, and 26 The crossing angle of the warp and weft of the reinforcing fabric on the surface was set to 120 degrees. The crossing angle of the warp and weft of the reinforcing fabric on the surface of the cog portion of the transmission belt according to Comparative Example 2 and Examples 2, 7, 11, 20, 23, and 27 was set to 130 degrees. Further, the crossing angle between the warp and weft of the reinforcing fabric on the surface of the cog portion of the transmission belt according to Examples 4, 5, 8, 18, 21, and 24 was set to 110 degrees.

Table 4 shows the components contained in the compressed rubber layer 12 and the stretched rubber layer 14 used in the transmission belts according to Examples 1 to 27 and Comparative Examples (1, 2, 3). Table 5 shows the components contained in the adhesive rubber layer 13 used in the transmission belts according to Examples 1 to 27 and Comparative Examples (1, 2, 3).

In the transmission belts according to Examples 1 to 27 and Comparative Examples (1, 2, 3), the wide-angle woven fabric obtained by the wide-angle treatment of “A-1” or “A-2” was dried. After that, the reinforcing cloth layer 11 including only one wide-angle woven cloth subjected to the treatment for improving the adhesiveness with the compressed rubber layer 12 (treatment immersed in rubber paste) was used as the reinforcing cloth 19. As a material for the compressed rubber layer 12 and the stretched rubber layer 14, an unvulcanized rubber sheet made of the rubber composition shown in Table 4 was used. As a material for the adhesive rubber layer 13, an unvulcanized rubber sheet made of the rubber composition shown in Table 5 was used. As a core wire to be the core body 16, a cord of total denier 6000 in which 1000 denier PET fibers are twisted in a 2 × 3 twist configuration with an upper twist factor of 3.0 and a lower twist factor of 3.0, What gave the adhesion | attachment process was used. As the upper surface reinforcing fabric, the wide-angle woven fabric used in the comparative example 1 (lower surface) as the reinforcing fabric (a plain woven fabric treated with “A-1”) was used. An unvulcanized belt molded body is formed using the above materials, and the belt molded body is vulcanized with a vulcanizing can at a temperature of 160 ° C. for 20 minutes, and then V-cut. A low edge V belt having a width (width on the belt outer peripheral side) of 20 mm, a belt lower width (belt inner peripheral side width) of 15.5 mm, a thickness of 9.0 mm, and a cog height of 4.0 mm was manufactured.

It should be noted that with reference to Tables 1 to 3, in the transmission belts according to Comparative Examples (1, 2, 3), the solid content concentration of the adhesive liquid used in the production of the reinforcing cloth is 2.8%. On the other hand, in the transmission belts according to Examples 1 to 27, the solid content concentration of the adhesive liquid is 7.0%. The reason for setting the solid content concentration of the adhesive liquid to different values will be described below.

Regarding the adhesive liquid, if the solid content concentration is too low, the wide-angle woven fabric subjected to the wide-angle treatment is likely to be insufficiently sealed, and the reinforcement fabric and the rubber of the compressed rubber layer are likely to be insufficiently bonded. On the other hand, if the solid content concentration is too high, the woven fabric becomes tough due to the curing of the adhesive liquid, and the flexibility of the transmission belt 1 tends to be lowered. Therefore, the solid content concentration of the adhesive liquid used in the adhesive liquid dipping process is preferably in the range of 2 to 26% by mass as described in the above-described reinforcing cloth manufacturing process.

In each of the comparative examples (1, 2, 3) in which the “A-1” wide-angle treatment method that widens the crossing angle between the warp and weft of the plain weave fabric, an adhesive solution having a relatively low solid content concentration of 2.8% is used. Even if it used, the adhesive liquid was hardened by the 120 degreeC drying process, and the wide angle woven fabric of the target crossing angle (The comparative example 1 and the comparative example 3 is 130 degree | times, and the comparative example 2 is 140 degree | times) was obtained.

On the other hand, in Examples 1-27 in which the wide-angle processing method of “A-2” used in the wide-angle processing step S203 is performed, if the wide-angle woven fabric is insufficiently sealed, the adhesive liquid is dried by 120 ° C. Even if the material is hardened, the crossing angle tends to become smaller (will try to be restored) over time. Therefore, the relationship between the solid content concentration of the adhesive liquid and the tendency to reduce the crossing angle after the adhesive liquid was cured was examined by the following experiment. The results are shown in Table 6.

Cotton-PET blended cotton (Cotton / PET = 50/50), a woven fabric with bag weaving (twisting two 20th yarns with a cotton count and a warp and weft) A wide-angle treatment of “A-2” used in the wide-angle treatment step S203 is performed using an RFL solution having a different solid content concentration as the adhesive liquid, and the adhesive liquid is dried at 120 ° C. for 5 minutes. With respect to the wide-angle woven fabric obtained by curing No. 1, the crossing angle was measured immediately after the drying treatment and after being allowed to stand at room temperature for 24 hours thereafter.

When an adhesive liquid having a solid content concentration of 2.0% by mass, 4.0% by mass, and 6.0% by mass is used with respect to the target crossing angle of 130 °, the crossing angle of 130 ° immediately after the drying process. However, the crossing angle was reduced after 24 hours. When the solid content concentration was 7.0% by mass or more, the crossing angle could be maintained at 130 degrees immediately after the drying treatment and after 24 hours. From these results, in Examples 1 to 27, an adhesive solution having a solid content concentration of 7.0% by mass was used.

As a performance evaluation test of the transmission belt according to the comparative examples (1, 2, 3) and Examples 1 to 27, the crack is generated in the cog valley in a state where the transmission belt is wound around the driving pulley and the driven pulley and traveled. A test was conducted to measure the running time. FIG. 17 is a diagram schematically showing the layout of the test apparatus 38 used in the performance evaluation test of the transmission belt. The test device 38 is configured as a device including a drive pulley 39, a driven pulley 40, an idler pulley 41, an axial load adding mechanism 42, and the like. In FIG. 17, the transmission belts according to the comparative examples (1, 2, 3) and Examples 1 to 27, which are the objects of the performance evaluation test, are illustrated as the transmission belt 43.

The diameters of the driving pulley 39 and the driven pulley 40 were both set to 100 mm. The diameter of the idler pulley 41 was set to 80 mm. In the performance evaluation test, the transmission belt 43 travels when the drive pulley 39 rotates while the transmission belt 43 to be tested is wound around the drive pulley 39 and the driven pulley 40. The rotational speed (rotational speed) of the drive pulley 39 when the transmission belt 43 was run was set to 3600 rpm. The axial load (dead weight) generated by the axial load adding mechanism 42 was set to 130 kgf. The winding angle of the transmission belt 43 around the idler pulley 41 was set to 160 degrees. Further, the ambient temperature when the performance evaluation test of the transmission belt 43 was performed by the test apparatus 38 was set to 80 ° C.

Under the above test conditions, the performance evaluation tests of the transmission belts according to the comparative examples (1, 2, 3) and the examples 1 to 27 are performed, and the running time (hr) until a crack occurs in the cog valley is determined. It was measured. Tables 1 to 3 show the running time (hr) until the occurrence of the Cog valley crack as a result of the performance evaluation test. If the running time until the occurrence of the Cog valley crack was 20 hours or more, it was determined that there was no problem as a low edge V belt (transmission belt) used in a continuously variable transmission.

As shown in the performance evaluation test results in Tables 1 to 3, all of the transmission belts according to the comparative examples (1, 2, 3) using the reinforcing fabric obtained by treating the plain woven fabric with a wide angle up to the occurrence of the Cog valley crack. The running time was 20 hours or less. This is because the right angle joint and the bias joint of the reinforcing cloth exist in the cog valley, the stress applied to the cog valley where the joint exists is concentrated unevenly, resulting in excessive stress concentration, and further, the bending of the transmission belt It is thought that sometimes the expansion and contraction of the reinforcing fabric does not follow. For this reason, it is considered that cracks occurred early in the Kog valley. On the other hand, in all of the transmission belts according to Examples 1 to 27 of the present invention, the running time until the occurrence of the Cog valley crack greatly exceeded 20 hours, which is a level that causes no problem as a transmission belt.

(A) Examination of the crossing angle between the warp and the weft in the reinforcing fabric The transmission belts according to Examples 4, 1 and 2 have different crossing angles between the warp and the weft in the reinforcing fabric (see Table 1). The crossing angle of the transmission belt according to Example 4 is 110 degrees, the crossing angle of the transmission belt according to Example 1 is 120 degrees, and the crossing angle of the transmission belt according to Example 2 is 130 degrees). The same. The traveling time until the occurrence of the Cog Valley cracks became longer as the crossing angle increased.

Referring to Table 1, it can be seen that the yarn density after the wide-angle treatment in Examples 4, 1 and 2 described above increases as the crossing angle increases. It is considered that since the strength of the woven fabric is increased by increasing the yarn density (that is, increasing the number of yarns per unit width), the running time until the occurrence of the cog valley crack is increased.

(B) Study on Yarn Density The transmission belts according to Examples 1, 6, and 9 have different warp / weft yarn densities before wide angle processing (refer to Table 1 and Table 2 according to Example 1). The yarn density before the wide-angle treatment of the transmission belt is 45 / 5cm, the yarn density of the transmission belt before the wide-angle treatment according to Example 6 is 55 / 5cm, and the yarn density of the transmission belt according to the ninth embodiment before the wide-angle treatment is The rest of the configuration is the same except for 65 points / 5 cm). The traveling time until the occurrence of the Cog valley crack became longer as the yarn density before the wide-angle treatment increased. It is considered that the running time until the occurrence of the cog valley crack is increased because the yarn density before the wide-angle treatment is increased (that is, the number of yarns per unit width is increased) and the strength of the woven fabric is increased.

(C) Examination of thread thickness The transmission belts according to Examples 1 and 13 have different warp and weft thicknesses (see Table 1 and Table 2 for the warp of the transmission belt according to Example 1). -The weft is a twist of two 20th yarns blended with cotton and PET; the warp of the transmission belt according to Example 13; the weft is a twist of three 20th yarns blended with cotton and PET Except for the above, the other configurations are generally the same. Similarly, the other configurations of the power transmission belts according to Examples 6 and 14 are substantially the same except that the thicknesses of the warp and the weft are different from each other. As can be seen from the comparison results between Example 1 and Example 13 and the comparison results between Example 6 and Example 14, the running time until the occurrence of the Cog valley crack is increased by increasing the thickness of the yarn. Was confirmed.

When the transmission belt according to Example 12 and the transmission belt according to Example 1 are compared, the yarn density before the wide-angle treatment is smaller in the transmission belt according to Example 12, but the traveling time until the occurrence of the cog valley crack Is equivalent to the transmission belt according to the first embodiment. This is because although the transmission belt according to Example 12 has a narrow yarn interval and a low yarn density, the yarn density is small, but the yarn is thick. 1 is considered to be equivalent to the transmission belt according to No. 1.

(D) Examination of material of yarn The transmission belts according to Examples 9, 15, 16, 17, and 25 have the same configuration except that the materials of warp and weft are different from each other. Specifically, the yarn used for the transmission belt according to Example 9 is a blended yarn of cotton and PET, and the yarn used for the transmission belt according to Example 15 is a cotton spinning yarn. The yarn used for the transmission belt is PET spinning, the yarn used for the transmission belt according to Example 17 is meta-aramid spinning, and the yarn used for the transmission belt according to Example 25 is PET spinning and meta-spinning. It is a blended yarn with aramid spinning.

The comparison results of the traveling time until the occurrence of the cog valley crack in Examples 9, 15, 16, 17, and 25 are as follows: Example 15 (cotton, 35 hours) <Example 9 (cotton / PET, 46 hours) <Example 16 (PET, 47 hours) <Example 17 (meta-aramid, 49 hours) = Example 25 (meta-aramid / PET, 49 hours).

Although PET and meta-aramid have the same strength and elastic modulus, meta-aramid is superior in heat resistance and dimensional stability. On the other hand, cotton is used for general purposes although it has lower strength and elastic modulus than PET and meta-aramid. In terms of cost, the relationship is cotton <PET <meta-aramid. The material of the thread | yarn used for a reinforcement cloth can be properly used according to the required quality and cost.

Further, referring to Table 3, from the results of Examples 18 to 27, as in Examples 1 to 11 (mixed yarn of cotton and PET), as a warp and weft, a mixture of PET spun and meta-aramid spun is used. Even when the twisted yarn was used, it was confirmed that the traveling time until the occurrence of the cog valley crack was increased as the yarn density and the crossing angle were increased.

[Effect of this embodiment]
As described above, according to the present embodiment, the reinforcing cloth 19 that covers the surface of the cog 18 along the longitudinal direction of the belt is joined at both ends only at one joint 20 in the longitudinal direction of the belt. . And the junction part 20 provided in the reinforcement cloth 19 only in one place is arrange | positioned in the position corresponding to one cog mountain 18a. For this reason, the joint portion 20 of the reinforcing cloth 19 is always disposed in the cog mountain 18a and is not disposed in the cog valley 18b.

Therefore, according to this embodiment, the joint part 20 of the reinforcing cloth 19 arranged on the surface of the cog part 18 does not exist in the cog valley 18b. For this reason, it is suppressed that stress concentrates unevenly in the cog valley 18b and causes excessive stress concentration, and the stress in the cog valley 18b can be made uniform. In addition, it is possible to suppress the expansion and contraction of the reinforcing cloth 19 when the transmission belt 1 is bent, and it is possible to improve the bending fatigue resistance. Thereby, even if it is a case where the transmission belt 1 is used in a high load environment, it can suppress that a crack arises in the cog valley 18b at an early stage, and can aim at the improvement of a durable life. That is, it is possible to achieve high durability when used in a high load environment.

Therefore, according to this embodiment, even when used in a high-load environment, it is possible to suppress the early occurrence of cracks in the cog valley 18b, and to achieve high durability. The belt 1 and a method for manufacturing the transmission belt 1 can be provided.

In addition, according to the present embodiment, since there is only one joint 20 in the transmission belt 1, it is possible to ensure the durability of the transmission belt as compared with the case where there are a plurality of joints in the transmission belt.

Moreover, in this embodiment, the joint part 20 of the reinforcing cloth 19 is provided so as to extend in a substantially straight line along the belt width direction. For this reason, a part of the joint portion 20 of the reinforcing cloth 19 disposed on the cog mountain 18a is not separated from the cog mountain 18a and disposed on the cog valley 18b. That is, the joint portion of the reinforcing fabric 19 does not extend at an oblique angle (bias angle) with respect to the belt longitudinal direction (circumferential direction of the transmission belt 1), and is reliably disposed on the cog mountain 18a. Therefore, according to the present embodiment, the joint portion 20 can be more reliably disposed only on the cog mountain 18a.

Further, as in this embodiment, by setting the crossing angle between the warp yarn 22a and the weft yarn 22b viewed from the longitudinal direction of the belt to 110 degrees or more and 130 degrees or less, the reinforcing cloth 19 including these warp yarns 22a and weft yarns 22b is provided. It becomes possible to expand and contract sufficiently following the bending of the transmission belt 1. Thereby, durability of the reinforcement cloth 19 can be improved more.

Further, according to the present embodiment, another layer (specifically, an unvulcanized rubber sheet made of the material of the adhesive rubber layer 13, a plurality of core wires on the side (outer peripheral side) opposite to the cog portion 18 in the laminate 37. Since the unvulcanized rubber sheet as the material of the stretch rubber layer 14 and the upper surface reinforcing cloth 15) are laminated, the transmission belt 1 having an appropriate configuration can be manufactured.

Further, according to this embodiment, when the reinforcing cloth 19 of the transmission belt 1 is manufactured, when the belt-like cloth 24 to which the adhesive liquid is attached is stretched in the width direction and the crossing angle between the warp 22a and the weft 22b is widened, the length in the longitudinal direction is increased. Since the belt-like cloth 24 is stretched in the width direction so as to shrink, the continuous wide-angle woven cloth 25 in which the crossing angle is widened can be easily produced. Moreover, according to this embodiment, the curing process of the adhesive liquid is performed by drying the wide-angle woven fabric 25 with the crossing angle widened while the adhesive liquid is adhered. For this reason, it is possible to quickly cure the adhesive liquid while fixing the desired cross angle with the adhesive liquid, and fix the cross angle. When the reinforcing cloth 19 is manufactured, the desired crossing angle can be efficiently maintained by performing the bonding process and the crossing angle widening process at substantially the same timing.

Further, as in this embodiment, the belt-like cloth 24 to which the adhesive liquid is attached is subjected to wide-angle processing so that the crossing angle between the warp yarn 22a and the weft yarn 22b as viewed from the belt longitudinal direction is 120 degrees or more and 140 degrees or less. The intersection angle between the warp yarn 22a and the weft yarn 22b included in the reinforcing fabric 19 after the vulcanization step is slightly smaller than 120 degrees or more and 140 degrees or less (in the case of this embodiment, 110 degrees or more and 130 degrees or less) Become. By setting the crossing angle between the warp yarns 22a and the weft yarns 22b included in the reinforcing fabric 19 after the vulcanization process to 110 degrees or more and 130 degrees or less, the reinforcing fabric 19 including the warp yarns 22a and the weft yarns 22b is attached to the transmission belt 1. It becomes possible to expand and contract sufficiently following the bending. Thereby, durability of the reinforcement cloth 19 can be improved more.

[Modification]
Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made as long as they are described in the claims. For example, you may implement the following modifications.

(1) In the above-described embodiment, the reinforcing cloth layer is disposed on the surface of the inner peripheral compression rubber layer and the upper surface reinforcing cloth is disposed on the outer peripheral stretch rubber layer. This does not have to be the case. A form in which the reinforcing cloth layer is arranged on the surface of the compression rubber layer on the inner peripheral side and the upper surface reinforcing cloth is not arranged on the surface of the stretched rubber layer on the outer peripheral side may be implemented.

(2) In the above-described embodiment, an example in which the reinforcing cloth layer on the surface of the compression rubber layer on the inner peripheral side includes only one reinforcing cloth has been described as an example, but this need not be the case. In the reinforcing cloth layer on the surface of the compression rubber layer on the inner peripheral side, a form in which two or more reinforcing cloths are included may be implemented. In this case, the plurality of reinforcing cloths are disposed in a stacked manner, and are disposed over the entire circumference along the belt longitudinal direction.

(3) In the above-described embodiment, the configuration in which the cog portion is provided only in the inner peripheral compression rubber layer has been described as an example, but this need not be the case. A form in which a cog portion is also provided on the outer peripheral rubber layer may be implemented.

(4) In the above-described embodiment, the joint portion of the reinforcing cloth is described as an example in which the joint portion is provided as a joined portion by being bonded in a state where both ends of the reinforcing cloth are overlapped. This does not have to be the case.

FIG. 18 is a view for explaining a modification of the joint portion of the reinforcing cloth, and is a cross-sectional view showing a cog portion and a part of the reinforcing cloth. FIG. 18 is shown as a cross-sectional view corresponding to FIG. 4 of the above-described embodiment. In FIG. 18, elements corresponding to the above-described embodiment are denoted with the same reference numerals. As shown in FIG. 18, the joint portion 44 that joins both end portions of the reinforcing cloth 19 is provided as a joined portion by being bonded in a state where both end portions of the reinforcing cloth 19 are abutted. Such a form of the joint 44 may be implemented.

(5) In the above-described embodiment, as the laminated body forming step, first, the reinforcing cloth 19 is wound around the outer periphery of the mold 33 in a state of being in close contact with the surfaces of the groove portion 33a and the mountain portion 33b. Although an example in which the unvulcanized rubber sheet 35 is molded and the endless laminated body 37 is formed has been described as an example, this need not be the case. For example, the laminated body formation process which concerns on the modification shown in FIG. 19 thru | or FIG. 21 may be implemented.

FIG. 19 to FIG. 21 are diagrams for explaining a modified example of the laminated body forming step. FIG. 19 is a cross-sectional view schematically showing the reinforcing cloth 19, the unvulcanized rubber sheet 35, and the cog forming die 45. FIG. 20 is a cross-sectional view schematically showing a state in which the cogging portion 18 is formed on the unvulcanized rubber sheet 35 after being molded on the surface of the cog molding die 45. FIG. 21 is a view schematically showing a partial cross section in a state where an endless laminated body 37 is formed on the outer periphery of the mold 33. In FIG. 19 to FIG. 21, elements corresponding to the above-described embodiment are denoted by the same reference numerals. In the following description of the modified examples, the elements corresponding to the above-described embodiment will be described with reference to the same reference numerals.

In the laminated body forming process according to the modified example, a reinforcing cloth 19 to which a rubber material is attached in order to improve the adhesion to the compressed rubber layer 12 is molded on the cog forming mold 45 (see FIG. 19). ). When the reinforcing cloth 19 is molded on the cog forming mold 45, for example, a pinion roll or the like is used. When the reinforcing cloth 19 is molded on the cog forming mold 45, the unvulcanized rubber sheet 35 for the compressed rubber layer 12 is disposed on the reinforcing cloth 19. Then, as shown in FIG. 20, the laminated reinforcing fabric 19 and the unvulcanized rubber sheet 35 are molded by a cog molding die 45. Thereby, the cog pad 46 in which the cog portion 18 is formed on the unvulcanized rubber sheet 35 in a state where the reinforcing cloth 19 and the unvulcanized rubber sheet 35 are laminated is manufactured.

The cog forming mold 45 is configured as, for example, a plate-shaped mold in which grooves 45a and peaks 45b are alternately arranged on the surface. The groove 45 a is provided as a groove-like portion that is recessed on the surface of the cog forming mold 45. The peak portion 45 b is provided as a peak-shaped portion protruding on the surface of the cog forming mold 45. In a state in which the reinforcing cloth 19 and the unvulcanized rubber sheet 35 are laminated and the cog pad 46 provided with the cog part 18 is formed, the groove part 45a corresponds to the cog mountain 18a, and the mountain part 45b corresponds to the cog valley 18b. Correspond. That is, the groove 45a forms the cog mountain 18a, and the mountain 45b forms the cog valley 18b.

In the above modification, only the reinforcing cloth 19 is first molded with respect to the cog forming mold 45, and then the unvulcanized rubber sheet 35 is disposed on the reinforcing cloth 19, so that the cog portion 18 is molded. Although an example has been described in which the above is performed, this need not be the case. A form in which the reinforcing cloth 19 and the unvulcanized rubber sheet 35 are laminated and the cog portion 18 is molded on the unvulcanized rubber sheet 35 by the cog molding die 45 may be implemented.

When the cog pad 46 provided with the cog portion 18 is formed by laminating the reinforcing cloth 19 and the unvulcanized rubber sheet 35, both end portions of the cog pad 46 are cut. At this time, both end portions of the cog pad 46 are cut at the central portion of the cog mountain 18a (see FIG. 20).

The cog pad 46 whose both ends are cut at the central portion of the cog mountain 18 a is removed from the cog forming mold 45 and wound around the outer periphery of the mold 33. At this time, the cog pad 46 is wound around the outer periphery of the mold 33 so that the cog mountain 18a fits into the groove part 33a and the mountain part 33b fits into the cog valley 18b. And the cut surface of the both ends of the cog pad 46 cut | disconnected by the center part of the cog mountain 18a is butt-joined.

As described above, as shown in FIG. 21, the reinforcing cloth layer 11 including the reinforcing cloth 19 and the unvulcanized rubber sheet 35 for the compression rubber layer 12 are laminated and the unvulcanized rubber sheet 35 has a cog mountain 18a and An endless laminated body 37 provided with the cog portions 18 in which the cog valleys 18b are alternately arranged is formed. When both ends of the cog pad 46 are butted and joined to form the laminated body 37, both ends of the unvulcanized rubber sheet 35 are joined and both ends of the reinforcing cloth 19 are also joined. Thereby, the junction part 47 which joins the both ends of the reinforcement cloth 19 is also formed. Further, the joint portion 47 is disposed in one groove portion 33a. And in the laminated body 37, the junction part 47 is arrange | positioned at one cog mountain 18a in the cog part 18. FIG.

FIG. 22 is a view for explaining a belt molded body forming step performed after the laminated body forming step shown in FIGS. 19 to 21 is performed, and an endless laminated body 37 on the outer periphery of the mold 33. It is a figure which shows typically the state by which the some unvulcanized rubber sheet (48, 49) was laminated | stacked on the outer periphery of this.

When the laminated body forming step shown in FIGS. 19 to 21 is completed and the laminated body 37 is formed on the outer periphery of the mold 33, a plurality of unvulcanized rubber sheets (48, 49) are further formed on the outer periphery of the laminated body 37. Is laminated. More specifically, an unvulcanized rubber sheet 48 made of the material of the adhesive rubber layer 13 and a plurality of core wires, an unvulcanized rubber sheet 49 made of the material of the stretch rubber layer 14, and the upper surface reinforcing cloth 15 are disposed on the outer periphery of the laminate 37. Are stacked in this order. Thereby, an unvulcanized belt molding is formed.

22 is completed, a vulcanization process is then performed. In the vulcanization process, the belt molded body is accommodated in a vulcanizing can (not shown) together with the mold 33 in a state where the belt molded body is disposed on the outer periphery of the mold 33 and covered with a jacket. Then, the belt molded body is vulcanized inside the vulcanization can. When the vulcanization is completed, the V-cut process is performed as in the above-described embodiment, and the manufacture of the transmission belt is completed.

(6) In the above-described embodiment, the transmission belt 1 provided with one joint 20 is described as an example, but the present invention is not limited thereto. Specifically, a transmission belt provided with two or more joint portions may be configured. Even in this case, each joint is provided in the Cog Mountain and not in the Cog Valley. Even in the case of the transmission belt having the configuration as in the present modification, cracks may occur early in the cog valley 18b even when used in a high load environment, as in the case of the above embodiment. Can be suppressed, and high durability can be realized.

(7) In the above-described embodiment, the example in which the joint portion 20 is provided so as to extend along a direction substantially orthogonal to the belt longitudinal direction has been described. However, the present invention is not limited thereto. Specifically, the joint portion may be provided so as to extend obliquely with respect to the belt longitudinal direction. Even in this case, the joint portion is provided in the Cog mountain and is not provided in the Cog valley. Even in the case of the transmission belt having the configuration as in this modified example, cracks may occur early in the cog valley 18b even when used in a high load environment, as in the case of the above embodiment. Can be suppressed, and high durability can be realized.

Although the present invention has been described in detail and with reference to specific embodiments, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention.
This application is based on Japanese Patent Application No. 2015-038873 filed on Feb. 27, 2015 and Japanese Patent Application No. 2016-029759 filed on Feb. 19, 2016, the contents of which are incorporated herein by reference.

The present invention can be widely applied to a transmission belt, a transmission belt manufacturing method, a reinforcing cloth, and a reinforcing cloth manufacturing method.

DESCRIPTION OF SYMBOLS 1 Transmission belt 11 Reinforcement cloth layer 12 Compression rubber layer 18 Cog part

18a Cog mountain

18b Cog valley 19 Reinforcement cloth 20 Joint part

Claims

A compression rubber layer provided on the inner peripheral side, a cog portion provided in at least the compression rubber layer, in which cog ridges and cog valleys are alternately arranged along the belt longitudinal direction, and a reinforcing cloth covering the surface of the cog portion A transmission belt comprising a layer,
The reinforcing cloth layer includes at least one reinforcing cloth that is bonded to the surface of the cog mountain and the cog valley along the belt longitudinal direction and covers the surface of the cog part,
The reinforcing cloth is joined at both ends only by at least one joint in the belt longitudinal direction,
The transmission belt is a transmission belt that is disposed only at a position corresponding to the cog mountain.
The transmission belt according to claim 1,
A power transmission belt having only one joint.
The transmission belt according to claim 1 or 2,
The transmission belt is a transmission belt provided so as to extend substantially linearly along a direction substantially orthogonal to the belt longitudinal direction.
The transmission belt according to any one of claims 1 to 3,
The reinforcing fabric is a wide-angle woven fabric having a crossing angle between a warp and a weft as viewed from the belt longitudinal direction of 110 degrees or more and 130 degrees or less, and the wide-angle woven cloth is bonded to the warp by a cured product of an adhesive solution. A transmission belt in which the wefts are fixed to each other.
The transmission belt according to any one of claims 1 to 4,
The reinforcing cloth is produced by a reinforcing cloth producing process including a cutting process, an adhesive liquid immersing process, a wide-angle treatment process, and a drying process,
In the cutting step, a bag woven fabric constituted by weaving warps extending along the axial direction and wefts extending along the circumferential direction is cut spirally with respect to the axial direction,
In the adhesive liquid immersion step, a continuous continuous belt-like cloth produced by spirally cutting the bag woven fabric is immersed in the adhesive liquid,
In the wide-angle treatment step, the belt-like cloth to which the adhesive liquid is attached is stretched in the width direction,
In the drying step, the transmission belt in which the wide-angle woven fabric obtained in the wide-angle treatment step is dried and the adhesive liquid is cured.
A compression rubber layer provided on the inner peripheral side, a cog portion provided in at least the compression rubber layer, in which cog ridges and cog valleys are alternately arranged along the belt longitudinal direction, and a reinforcing cloth covering the surface of the cog portion A transmission belt manufacturing method for manufacturing a transmission belt comprising a layer,
Reinforcement cloth production process for producing reinforcement cloth,
An endless laminate in which the reinforcing cloth layer including at least one reinforcing cloth and the unvulcanized rubber sheet for the compressed rubber layer are laminated and the unvulcanized rubber sheet is provided with the cog portion. A laminated body forming step of forming a body;
A belt molded body forming step of forming an unvulcanized belt molded body from the laminate,
A vulcanization step of vulcanizing the belt molded body;
With
In the laminate forming step,
The reinforcing fabric layer is bonded to the surface of the cog mountain and the cog valley in the laminate,
The reinforcing cloth is arranged so as to cover the surface of the cog portion along the belt longitudinal direction,
The reinforcing fabric is joined at both ends only by at least one joint in the belt longitudinal direction,
The said joining part is a manufacturing method of a power transmission belt arrange | positioned only in the position corresponding to the said Kog mountain.
It is a manufacturing method of the power transmission belt according to claim 6,
A method for manufacturing a transmission belt, wherein only one joint is present.
It is a manufacturing method of the power transmission belt according to claim 6 or 7,
The transmission belt manufacturing method, wherein the joining portion is arranged to extend substantially linearly along a direction substantially orthogonal to the belt longitudinal direction.
It is a manufacturing method of the power transmission belt according to any one of claims 6 to 8,
The method for manufacturing a transmission belt, wherein in the belt molded body forming step, another layer is laminated on a side opposite to the cog portion in the laminated body.
It is a manufacturing method of the power transmission belt according to any one of claims 6 to 9,
The reinforcing cloth production process includes a cutting process, an adhesive liquid dipping process, a wide-angle treatment process, and a drying process,
In the cutting step, a bag woven fabric constituted by weaving warps extending along the axial direction and wefts extending along the circumferential direction is cut spirally with respect to the axial direction,
In the adhesive liquid immersion step, a continuous continuous belt-like cloth produced by spirally cutting the bag woven fabric is immersed in the adhesive liquid,
In the wide-angle treatment step, the belt-like cloth to which the adhesive liquid is attached is stretched in the width direction,
In the drying process, the wide-angle woven fabric obtained in the wide-angle treatment process is dried, and the adhesive liquid is cured.
It is a manufacturing method of the power transmission belt according to claim 10,
In the wide-angle treatment step, the belt-like cloth to which the adhesive liquid is attached is subjected to a wide-angle treatment so that the crossing angle between the warp and the weft viewed from the belt longitudinal direction is 120 degrees or more and 140 degrees or less. The manufacturing method of a transmission belt.
A compression rubber layer provided on the inner peripheral side, a cog portion provided in at least the compression rubber layer, in which cog ridges and cog valleys are alternately arranged along the belt longitudinal direction, and a reinforcing cloth covering the surface of the cog portion Included in the reinforcing fabric layer in the transmission belt provided with a layer, and both end portions are joined by only at least one joining portion in the belt longitudinal direction, and the joining portion is only at a position corresponding to the cog mountain. A reinforcing cloth to be arranged,
Reinforcement cloth, which is a wide-angle woven cloth having a crossing angle between a warp and a weft of 110 degrees or more and 130 degrees or less as viewed from the belt longitudinal direction, and the warp and the weft are fixed to each other by a cured product of an adhesive liquid .
A compression rubber layer provided on the inner peripheral side, a cog portion provided in at least the compression rubber layer, in which cog ridges and cog valleys are alternately arranged along the belt longitudinal direction, and a reinforcing cloth covering the surface of the cog portion Included in the reinforcing fabric layer in the transmission belt provided with a layer, and both end portions are joined by only at least one joining portion in the belt longitudinal direction, and the joining portion is only at a position corresponding to the cog mountain. A method of manufacturing a reinforcing cloth to be arranged,
Including a cutting step, an adhesive liquid dipping step, a wide-angle treatment step, and a drying step,
In the cutting step, a bag woven fabric constituted by weaving warps extending along the axial direction and wefts extending along the circumferential direction is cut spirally with respect to the axial direction,
In the adhesive immersing step, the belt-like cloth produced by spirally cutting the bag woven cloth is immersed in the adhesive liquid,
In the wide-angle treatment step, the belt-like cloth to which the adhesive liquid is attached is stretched in the width direction,
In the drying process, the wide-angle woven fabric obtained in the wide-angle treatment process is dried, and the adhesive liquid is cured.