JP2009216181A - V-belt - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a V-belt having higher durability than conventional one. <P>SOLUTION: The V-belt B of a low edge type comprises a lower cog 24 formed on the inner periphery side of a belt body 100 at a constant pitch along the longitudinal direction, and an inside reinforcing cloth 23 covering the inner periphery side of the belt body 100. The inside reinforcing cloth 23 is formed of aramid fibers. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a low edge type V-belt.

  As a transmission belt for belt-type continuously variable transmissions mounted on vehicles such as motorcycles, buggies (ATVs), snowmobiles, golf carts, etc., along the length direction on the inner and outer peripheral sides of the belt body A wide range of low-edge type V-belts in which cogs are formed at a constant pitch and the inner and outer peripheral sides of the belt body are covered with a reinforcing cloth formed of cotton, nylon fibers, or polyester fibers. It is used.

  In Patent Document 1, a compression rubber layer is disposed below the tensile body layer to form a belt main body, and a canvas layer and a thinner short fiber-containing rubber layer are formed below the belt main body. A power transmission belt is disclosed in which the short fiber is mixed in the range of 3 to 30 parts by weight in a short fiber mixed rubber layer which is alternately laminated. According to this, by laminating a plurality of canvas layers, the lateral pressure is improved, noise due to a decrease in tension is prevented, and there is little unevenness in the friction coefficient between the short fiber-containing rubber layer and the canvas layer. Therefore, it is described that noise is reduced.

  In Patent Document 2, an adhesive rubber layer in which a core made of a low-strength and high-strength rope is embedded, an extension rubber layer is disposed above the adhesive rubber layer, and a compression rubber layer is disposed below the adhesion rubber layer. In a power transmission V-belt with a 1-ply or more cover canvas affixed to the bottom of the layer, the cover canvas has aramid spun yarn as the warp in the belt width direction and at least Woolen yarn or urethane elastic as the weft in the belt longitudinal direction. The thing using the thread | yarn containing the elastic thread which consists of a thread | yarn is disclosed. According to this, at least the bottom surface of the compressed rubber layer that receives a large lateral pressure from the pulley, the aramid fiber spun yarn is used as the warp in the belt width direction, and the weft yarn or urethane elastic yarn is used as the weft in the belt longitudinal direction. By affixing one or more plies of a cover canvas using a thread including elastic yarn, the wear resistance in the belt width direction is improved, and the elasticity of the belt longitudinal direction is imparted to the cover canvas. It is described that the life is improved by preventing the occurrence of cracks.

  In Patent Document 3, an adhesive rubber layer in which a core wire made of a rope is embedded, an extension rubber layer on the upper side of the adhesive rubber layer, and a compression rubber layer on the lower side thereof are arranged, and the belt periphery is not covered with a cover cloth. It is a power transmission belt, and a weight ratio of polymetaphenylene isophthalamide to a spun yarn made of polymetaphenylene isophthalamide and a spun yarn made of polyethylene terephthalate is 25 to 75 on at least one reinforcing cloth laminated on a compression rubber layer. %, It is disclosed that a structure using a fabric woven with yarns mixed and twisted so as to become a percentage is disclosed. And according to this, it is described that the belt slip ratio can be reduced and the transmission performance can be improved without lowering the heat resistance and crack resistance.

In Patent Document 4, an adhesive rubber layer in which a cord made of a cord is embedded, an extended rubber layer above the adhesive rubber layer, and a compression rubber layer below the adhesive rubber layer are arranged, and the belt periphery is not covered with a cover canvas. A power transmission belt is disclosed in which at least one layer of reinforcing cloth laminated on a compressed rubber layer is made of a cloth woven using a yarn in which polyarylate fibers and other fibers are mixed. . And according to this, it is described that the heat resistance and crack resistance can be improved without reducing the transmission performance (belt slip ratio).
No. 2530182 Utility Model Registration Gazette No. 2584618 Utility Model Registration Gazette JP-A-7-217706 JP-A-9-273606

  By the way, in recent years, higher output of belt type continuously variable transmissions has progressed, and for this reason, V-belts are used under high loads. In addition, the belt-type continuously variable transmission has been miniaturized, and therefore the V-belt is used under a high ambient temperature. When the use environment of the V-belt becomes harsh as described above, the belt main body receives a large shearing force, and the progress of the thermal deterioration of the rubber forming the belt main body is accelerated, and as shown in FIG. The occurrence of a crack c extending from the cog bottom between the cogs a and the center of the belt body b has become earlier than before.

  The present invention has been made in view of such points, and an object thereof is to provide a V-belt having higher durability than conventional ones.

The present invention that achieves the above object is a low edge type in which a lower cog is formed at a constant pitch along the length direction on the inner peripheral side of the belt main body, and the inner peripheral side of the belt main body is covered with an inner reinforcing cloth. V belt,
The inner reinforcing cloth is formed of an aramid fiber.

  According to the above configuration, since the inner reinforcing cloth covering the inner peripheral side of the belt main body is formed of the aramid fiber that is a high-strength fiber, the belt main body is subjected to a large shearing force and the rubber that forms the belt main body. Even if the thermal deterioration has progressed, the occurrence of cracks at the bottom of the cog between the lower cog and the lower cog is suppressed, and compared to the conventional one in which the inner reinforcing fabric is formed of cotton, nylon fiber, or polyester fiber High durability can be obtained.

In the present invention, an upper cog is formed at a constant pitch along the length direction on the outer peripheral side of the belt main body, and the outer peripheral side of the belt main body is covered with an outer reinforcing cloth.
The outer reinforcing cloth may be formed of aramid fibers.

  According to the above configuration, in the double-cog type V-belt in which the cogs are formed on the inner peripheral side and the outer peripheral side of the belt main body, the outer reinforcing cloth covering the outer peripheral side of the belt main body is also an aramid Since it is formed of fibers, the occurrence of cracks at the bottom of the cog between the upper cog and the upper cog is suppressed, and high durability can be obtained.

Another aspect of the present invention is a low edge type V-belt in which upper cogs are formed at a constant pitch along the length direction on the outer peripheral side of the belt main body, and the outer peripheral side of the belt main body is covered with an outer reinforcing cloth. There,
The outer reinforcing fabric is formed of an aramid fiber.

  According to the above configuration, since the outer reinforcing cloth covering the outer peripheral side of the belt main body is formed of the aramid fiber that is a high-strength fiber, the belt main body receives a large shearing force and the heat of rubber forming the belt main body. Even if deterioration progresses, the occurrence of cracks at the bottom of the cog between the upper cog and the upper cog is suppressed, which is higher than the conventional one in which the outer reinforcing fabric is formed of cotton, nylon fiber, or polyester fiber. Durability can be obtained.

  Since the V-belt of the present invention has improved durability compared to the prior art, it is suitable for use as a transmission belt for a belt-type continuously variable transmission mounted on a vehicle that is required to be used in a harsh environment. .

  As described above, according to the present invention, the reinforcing cloth covering the inner peripheral side or the outer peripheral side of the belt main body is formed of the aramid fiber that is a high-strength fiber. Even if the thermal deterioration of the rubber forming the rubber has progressed, the occurrence of cracks at the bottom of the cog between the cogs is suppressed, and a reinforcing fabric is formed of cotton, nylon fiber, or polyester fiber Higher durability can be obtained.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows a double cogged V-belt B according to an embodiment of the present invention.

  In this double cogged V-belt B, the belt main body 100 includes an endless core wire embedded portion 10, a lower cog forming portion 20 integrally provided on the inner peripheral side of the core wire embedded portion 10, and the outer periphery of the core wire embedded portion 10. It is a low edge type comprising an upper cog forming portion 30 integrally provided on the side.

  The core wire embedded portion 10 includes a core wire embedded portion main body 11 formed of a rubber composition and a core wire 12 embedded therein so as to form a spiral having a predetermined pitch in the belt width direction. The rubber composition constituting the core wire embedded body 11 includes chloroprene rubber (CR), ethylene / propylene / diene / terpolymer rubber (EPDM), alkylated chlorosulfonated polyethylene rubber (ACSM), hydrogenated NBR (H- NBR) and the like. The core wire 12 is constituted by an adhesive treatment that is dipped in a resorcin / formalin / latex aqueous solution (hereinafter referred to as “RFL aqueous solution”) in a twisted yarn such as polyester (PET) fiber and then dried.

  The lower cog forming portion 20 includes a lower cog forming portion main body 22 formed of a rubber composition mixed and dispersed so that the short fibers 21 are oriented in the belt width direction, and the surface thereof, that is, the inner peripheral side of the belt main body 100. And an inner reinforcing cloth 23 for covering. The rubber component of the rubber composition constituting the lower cog forming body 22 is chloroprene rubber (CR), ethylene / propylene / diene / terpolymer rubber (EPDM), alkylated chlorosulfonated polyethylene rubber (ACSM), hydrogenated NBR. (H-NBR) and the like. The short fibers 21 are, for example, high-strength polyvinyl alcohol (PVA) fibers, para-aramid fibers, aromatic polyester fibers, heterocycle-containing aromatic fibers, and the like.

  The inner reinforcing cloth 23 is a para-aramid fiber (for example, DuPont's trade name: Kevlar 29, Kevlar 119, Teijin's trade name: Technora) or a meta-aramid fiber (for example, DuPont's trade name: Nomex, Teijin). Made of company name: Conex), woven fabric with extensibility, soaked in RFL aqueous solution and heated to form RFL film on the woven fabric surface and / or immersed in rubber paste Then, it is dried and is subjected to an adhesion treatment for forming a rubber paste film. The RFL aqueous solution is made of latex such as vinylpyridine / styrene butadiene rubber (Vp / SBR) latex, chloroprene rubber (CR) latex, chlorosulfonated polyethylene rubber (CSM) latex, alkylated chlorosulfonated polyethylene rubber (ACSM) latex, etc. Is. The rubber paste is obtained by, for example, dissolving a rubber composition forming the belt body 10 in an organic solvent. In addition, before the adhesion treatment with the RFL aqueous solution, it may be heated after being immersed in a treatment liquid containing an epoxy resin or an isocyanate resin, and a base adhesion treatment for covering the surface of the woven fabric with the epoxy resin or the isocyanate resin may be performed.

  The inner reinforcing cloth 23 has a woven structure such as a plain weave, a twill weave, a satin weave, etc., each having 30 to 150 warps and wefts per 5 cm width. The warp and weft constituting the inner reinforcing cloth 23 are, for example, filament bundles of meta-aramid fibers (for example, trade name: Conex manufactured by Teijin Ltd.) or para-aramid fibers (for example, trade name: Technora manufactured by Teijin Limited). Even if it is composed of single-twisted yarn or spun yarn (including spun yarn using check-processed yarn), or composed of covering yarn in which an aramid fiber is covered with an elastic yarn such as urethane Furthermore, a double covering yarn (for example, 200-400 dtex urethane elastic yarn is covered with 150-300 dtex aramid fiber as an intermediate yarn). The outermost yarn is covered with 100-200 dtex nylon fiber) The inner reinforcing cloth 23 may be arranged in a biased manner so that the warp and the weft are inclined at the same or different angles with respect to the belt length direction, and one of the inner reinforcement fabrics 23 is the belt length. It may be arranged so that it extends along the direction and the other extends in the belt width direction, and the angle between the warp and the weft is, for example, 90 to 110 °.

  The lower cog forming portion 20 has lower cogs 24 arranged at a constant pitch along the belt longitudinal direction, and a groove 25 extending in the belt width direction is formed between the adjacent lower cogs 24. A vertical cross-sectional outer shape of the lower cog 24 is formed in a substantially sinusoidal waveform, and is formed in an arc shape in which the bottom of the groove 25 is concave outward.

  The upper cog forming portion 30 includes an upper cog forming portion main body 32 formed of a rubber composition mixed and dispersed so that the short fibers 31 are oriented in the belt width direction, and the surface thereof, that is, the outer peripheral side of the belt main body 100. The outer reinforcing cloth 33 is covered. The rubber component of the rubber composition constituting the upper cog forming body 32 is chloroprene rubber (CR), ethylene / propylene / diene / terpolymer rubber (EPDM), alkylated chlorosulfonated polyethylene rubber (ACSM), hydrogenated NBR. (H-NBR) and the like. The short fibers 31 are, for example, high-strength polyvinyl alcohol (PVA) fibers, para-aramid fibers, aromatic polyester fibers, heterocycle-containing aromatic fibers, and the like.

  The outer reinforcing cloth 33 is a para-aramid fiber (for example, DuPont's trade name: Kevlar 29, Kevlar 119, Teijin's trade name: Technora) or a meta-aramid fiber (for example, DuPont's trade name: Nomex, Teijin). Made of company name: Conex), woven fabric with extensibility, soaked in RFL aqueous solution and heated to form RFL film on the woven fabric surface and / or immersed in rubber paste Then, it is dried and is subjected to an adhesion treatment for forming a rubber paste film. The RFL aqueous solution is made of latex such as vinylpyridine / styrene butadiene rubber (Vp / SBR) latex, chloroprene rubber (CR) latex, chlorosulfonated polyethylene rubber (CSM) latex, alkylated chlorosulfonated polyethylene rubber (ACSM) latex, etc. Is. The rubber paste is obtained by, for example, dissolving a rubber composition forming the belt body 10 in an organic solvent. In addition, before the adhesion treatment with the RFL aqueous solution, it may be heated after being immersed in a treatment liquid containing an epoxy resin or an isocyanate resin, and a base adhesion treatment for covering the surface of the woven fabric with the epoxy resin or the isocyanate resin may be performed.

  The outer reinforcing cloth 33 has a woven configuration such as a plain weave, a twill weave, a satin weave, etc., each having 30 to 150 warps and wefts per 5 cm width. The warp and weft constituting the outer reinforcing fabric 33 are, for example, a filament bundle of meta-aramid fiber (for example, trade name: Conex manufactured by Teijin Ltd.) or para-aramid fiber (for example, trade name: Technora manufactured by Teijin Limited). Even if it is composed of single-twisted yarn or spun yarn (including spun yarn using check-processed yarn), or composed of covering yarn in which an aramid fiber is covered with an elastic yarn such as urethane In addition, a double covering yarn (for example, 200-400 dtex urethane elastic yarn is covered with 150-300 dtex aramid fiber as an intermediate yarn, which is further covered with nylon fiber as an outermost yarn on this covering yarn, The outermost yarn is covered with 100-200 dtex nylon fiber) The outer reinforcing cloth 33 may be arranged in a bias shape so that the warp and the weft are inclined at the same or different angles with respect to the belt length direction, and one of the outer reinforcing cloths 33 is the belt length. It may be arranged so that it extends along the direction and the other extends in the belt width direction, and the angle between the warp and the weft is, for example, 90 to 110 °.

  The upper cog forming portion 30 has upper cogs 34 disposed at a constant pitch along the belt longitudinal direction, and grooves 35 extending in the belt width direction are formed between the upper cogs 34 adjacent to each other. The outer profile of the upper cog 34 is formed in a substantially trapezoidal shape, and is formed in an arc shape in which the bottom of the groove 35 is concave outward.

  The double cogged V-belt B is used as a transmission belt (transmission belt) in a belt-type continuously variable transmission mounted on a vehicle such as a motorcycle, a buggy, or a snowmobile.

  FIG. 2 shows a belt-type continuously variable transmission T in which the double cogged V-belt B is used.

  The belt type continuously variable transmission T includes a drive pulley 1 that is drivingly connected to an output shaft of an engine (not shown), and a driven pulley 2 that is drivingly connected to a drive wheel (not shown). . The driving pulley 1 and the driven pulley 2 are speed change V pulleys. In other words, the drive pulley 1 and the driven pulley 2 are fixed to the respective rotating shafts 3 and 4 so as to rotate integrally with each other and are not movable in the axial direction, and to the rotating shafts 3 and 4 with respect to the fixed sheave 5. And a movable sheave 6 which is opposed to each other so as to form a belt groove 7 having a V-shaped cross section and is supported so as to be rotatable and slidable in the axial direction. A double cogged V-belt B is wound between the belt grooves 7 and 7 of the drive pulley 1 and the driven pulley 2, and the movable sheave 6 of the drive pulley 1 and the driven pulley 2 is brought into contact with and separated from the fixed sheave 5. The speed ratio between 1 and the driven pulley 2 is changed. Specifically, when the movable sheave 6 of the drive pulley 1 is separated from the fixed sheave 5 to open the drive pulley 1 and the movable sheave 6 of the driven pulley 2 is brought close to the fixed sheave 5 and the driven pulley 2 is closed, The pulley diameter of the driving pulley 1 is made smaller than that of the driven pulley 2, and the rotational speed of the driving pulley 1 is decelerated to transmit to the driven pulley 2, while the movable sheave 6 of the driving pulley 1 approaches the fixed sheave 5. When the driven pulley 1 is closed and the movable sheave 6 of the driven pulley 2 is separated from the fixed sheave 5 and the driven pulley 2 is opened, the pulley diameter of the driving pulley 1 is made larger than that of the driven pulley 2, and the driving pulley 1 The number of rotations is increased and a high speed state is transmitted to the driven pulley 2.

  According to the double cogged V-belt B having the above-described configuration, the lower cog 24 and the upper cog 34 are formed on the inner peripheral side and the outer peripheral side of the belt main body 100, respectively, but the inner side covering the inner peripheral side of the belt main body 100. Since the reinforcing cloth 23 is formed of an aramid fiber that is a high-strength fiber and the outer reinforcing cloth 33 that covers the outer peripheral side of the belt main body 100 is formed of an aramid fiber that is a high-strength fiber, the belt main body 100 is large. Even if the thermal deterioration of the rubber that receives the shearing force and forms the belt main body 100 proceeds, cracks at the bottom of the cog between the lower cog 24 and the lower cog 24 and between the upper cog 34 and the upper cog 34 Generation is suppressed, and durability higher than that of the conventional one in which the reinforcing cloth is formed of cotton, nylon fiber, or polyester fiber can be obtained.

  In the above embodiment, the double cogged V-belt B is used for a transmission belt of a belt-type continuously variable transmission T mounted on a vehicle, but is not particularly limited to this, and a normal belt transmission It may be used as a transmission belt in the apparatus.

  In the above embodiment, the double cogged V-belt B in which the lower cog 24 and the upper cog 34 are formed on the belt main body 100 is not particularly limited, and only the lower cog is formed on the belt main body. A V-belt may be used.

(Double cogged V belt for testing)
The double cogged V belt for each test of the following invention examples and comparative examples was prepared.

<Invention Example>
Cylindrical rubber sheet jointed so that the short fibers are oriented in the width direction, core wire made of aramid fiber subjected to adhesion treatment, and inner reinforcing cloth made of stretchable aramid fiber subjected to adhesion treatment Then, the cylindrical slab is molded and vulcanized on the outer periphery of the cylindrical mold, cut into a predetermined width, and then cut so that the belt cross section has a wedge angle of 30 ° and is polished. The double cogged V belt produced in this way was taken as an invention example. In the invention example, the belt circumferential length is 820 mm, the belt thickness is 15.5 mm, the belt width at the center of the core in the belt width direction is 28.0 mm, the lower cog height is 7 mm, and the upper cog height. Was 5 mm.

<Comparative example>
A double cogged V-belt made in the same configuration as the inventive example was used as a comparative example except that an inner reinforcing fabric formed of a blended yarn of cotton and polyester fibers was used instead of the aramid fiber inner reinforcing fabric.

(Test evaluation method)
For each of the two double cogged V belts of the inventive example and the comparative example, the driving pulley 61 has a pulley diameter of 100 mm and the driven pulley 62 has a pulley diameter of 80 mm in the traveling test machine 60 shown in FIG. Wrap the test double cogged V-belt B and apply a 1177N axial load to the driven pulley 62, rotate the drive pulley 61 at 6000 rpm, and test the double cogged V until a crack occurs in the cog bottom in an atmosphere of 95 ± 5 ° C. Belt B was run.

(Test evaluation results)
The test results are shown in Table 1.

  According to Table 1, it can be seen that the traveling time until the occurrence of cracks in the bottom of the cog is about 20% longer in the invention example than in the comparative example. This is because the inner reinforcing fabric covering the inner peripheral side of the belt body is made of aramid fiber, which is a high-strength fiber, even if the belt body is subjected to a large shearing force and the thermal deterioration of the rubber forming the belt body has progressed. Therefore, it is considered that the occurrence of cracks at the bottom of the cog between the lower cog and the lower cog is suppressed.

  The present invention is useful for a low edge type V-belt.

It is a perspective view of the double cogged V belt concerning the embodiment of the present invention. It is a schematic plan view of a belt type continuously variable transmission. It is a figure which shows the layout of a test evaluation apparatus. It is a perspective view of the conventional double cogged V belt.

Explanation of symbols

B Double cogged V belt 100 Belt body 23 Inner reinforcing cloth 24 Lower cog 33 Outer reinforcing cloth 34 Upper cog

Claims (4)

A low edge type V-belt in which a lower cog is formed at a constant pitch along the length direction on the inner peripheral side of the belt main body and the inner peripheral side of the belt main body is covered with an inner reinforcing cloth,
A V-belt, wherein the inner reinforcing fabric is formed of an aramid fiber. The V-belt according to claim 1, wherein
The belt body has an upper cog formed at a constant pitch along the length direction on the outer peripheral side and the outer peripheral side of the belt body is covered with an outer reinforcing cloth,
A V-belt characterized in that the outer reinforcing fabric is formed of an aramid fiber. A low edge type V-belt in which upper cogs are formed at a constant pitch along the length direction on the outer peripheral side of the belt main body and the outer peripheral side of the belt main body is covered with an outer reinforcing cloth,
A V-belt characterized in that the outer reinforcing fabric is formed of an aramid fiber. In the V belt according to any one of claims 1 to 3,
A V-belt used for a transmission belt of a belt-type continuously variable transmission mounted on a vehicle.

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