JP5302074B2 - V-ribbed belt and manufacturing method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain an excellent effect for suppressing the generation of noise during belt travel by keeping a pulley contact part in a low friction coefficient state without impairing the heat resistance of a V-ribbed belt. <P>SOLUTION: The V-ribbed belt B includes a belt body 10 having a plurality of V-ribs 13 provided to extend at an inner peripheral side of the belt in the belt-length direction, and a rib-side knit reinforcement cloth 14 provided to cover surfaces of the V-ribs 13 of the belt body 10. The rib-side knit reinforcement cloth 14 is provided so that the rate of elongation when load of 50 N is applied to a strip test piece having the width of 3 cm is 100-500% in the belt-length direction and 150-500% in the belt-width direction. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a V-ribbed belt and a method for manufacturing the same.

  When the V-ribbed belt is used while being wound around a rib pulley, the surface of the V-rib is covered with a reinforcing cloth in order to maintain the pulley contact portion in a low friction coefficient state.

  Patent Document 1 discloses a configuration in which the V-rib surface of a V-ribbed belt is coated with a nonwoven fabric impregnated with a friction coefficient reducing agent, thereby obtaining excellent bending resistance, quietness, and wear resistance. It is stated that

  Patent Document 2 discloses a configuration in which a thermoplastic resin such as a polyvinylidene fluoride film is provided between a rib and a fabric layer for a V-ribbed belt whose surface is covered with a fabric layer.

  In Patent Document 3, a V-ribbed belt having a V-rib surface coated with a fabric layer is provided with a polyvinylidene fluoride film on the pulley contact side surface of the fabric layer and optionally between the rib and the fabric layer. A configuration is disclosed in which a barrier layer containing a zinc salt of a saturated carboxylic acid ester grafted hydrogenated nitrile butadiene elastomer is provided.

Japanese Patent Publication No. 2-42344 JP 2002-122187 A JP 2002-5238 A

  By the way, in response to a demand for a compact engine room, as an auxiliary drive belt transmission device for an automobile, one V is provided for three or more pulleys including a crankshaft pulley (drive rib pulley), a power steering pulley, and an air conditioner pulley (driven rib pulley). A serpentine drive type around which a ribbed belt is wound is widely used.

  Accompanied by the high performance of automobiles, the number of parts accommodated in the engine room has increased, and the pulley layout of the accessory drive belt transmission can be applied to, for example, a belt span of a pair of pulleys around which a V-ribbed belt is wound. There has been a restriction that the length has to be narrowed or the pulley alignment tolerance has to be increased. Therefore, in the accessory drive belt transmission device, misalignment between a pair of adjacent rib pulleys becomes large, and as a result, there arises a problem that abnormal noise occurs due to the misalignment.

  An object of the present invention is to obtain an excellent noise suppression effect during belt running by maintaining the pulley contact portion of the V-ribbed belt in a low friction coefficient state without impairing heat resistance.

The V-ribbed belt of the present invention includes a belt main body having a plurality of V-ribs provided so as to extend in the belt length direction on the belt inner peripheral side, and a rib provided so as to cover the surface of the V-rib of the belt main body. Side knit reinforcing cloth,
The rib-side knitted reinforcing fabric has an elongation rate of 100 to 500% in the belt length direction and a stretch rate in the belt width direction of 150 to 500% when a load of 50 N is applied to a strip-shaped test piece having a width of 3 cm. It is characterized by being.

  In the V-ribbed belt of the present invention, it is preferable that the rib-side knitted reinforcing cloth is surface-coated with an RFL layer made of an RFL aqueous solution containing a friction coefficient reducing agent.

  In that case, the friction coefficient reducing agent is preferably polytetrafluoroethylene, and the polytetrafluoroethylene may be contained in an amount of 10 to 50 parts by mass with respect to 100 parts by mass of the RFL solid content of the RFL layer.

In the V-ribbed belt of the present invention, a rib surface rubber layer is provided between the V-rib of the belt body and the rib-side knit reinforcing cloth,
It is preferable that the rib surface rubber layer oozes out from the stitches of the rib side knit reinforcing cloth and is exposed to the pulley contact surface.

  In that case, the rib surface rubber layer is preferably formed of a rubber composition in which a raw material rubber is blended with a friction coefficient reducing agent. The friction coefficient reducing agent is preferably blended in an amount of 5 to 100 parts by mass with respect to 100 parts by mass of the raw rubber component.

  In the V-ribbed belt of the present invention, the yarn constituting the rib-side knitted reinforcing cloth may be a woolen processed yarn of polyamide fiber or polyester fiber.

  The V-ribbed belt of the present invention may be a covering yarn in which the yarn constituting the rib-side knitted reinforcing fabric has a polyurethane elastic yarn as a core yarn.

  In that case, it is preferable that the covering yarn is covered with a thread made of at least one of polyamide and ultrahigh molecular weight polyethylene.

  When the covering yarn is a double covered yarn, it is preferable that the double covered yarn is doubly covered with a yarn made of at least one of ultrahigh molecular weight polyethylene and polyamide.

  In the V-ribbed belt of the present invention, at least a portion constituting the V-rib of the belt body may be formed of a rubber composition using an ethylene-α-olefin elastomer as a raw rubber.

The manufacturing method of the V-ribbed belt of the present invention is as follows:
Providing a belt material including an uncrosslinked rubber material for forming a belt body and a knit cloth serving as a rib-side knit reinforcing cloth on the outer periphery of a cylindrical rubber sleeve mold;
Inserting the rubber sleeve mold provided with the belt material into a cylindrical outer mold provided with a rib forming portion on the inner periphery;
By inflating the rubber sleeve mold inserted into the cylindrical outer mold, the belt material is brought into pressure contact with the cylindrical outer mold, and the uncrosslinked rubber composition contained in the belt material is crosslinked and integrated. Steps,
It is equipped with.

  According to the present invention, the rib-side knitted reinforcing cloth has an elongation of 100 to 500% in the belt length direction when a load of 50 N is applied to a strip-shaped test piece having a width of 3 cm, and an elongation in the belt width direction. Since it is 150-500%, a pulley contact part can be maintained in the state of a low friction coefficient, without impairing heat resistance, As a result, the noise generation suppression effect outstanding at the time of belt travel can be acquired.

It is a perspective view of a V-ribbed belt. It is a perspective view of a V-ribbed belt. It is explanatory drawing of the manufacturing method of V-ribbed belt. It is explanatory drawing of the manufacturing method of V-ribbed belt. It is a figure which shows the pulley layout of the belt drive apparatus for accessory drive of embodiment. It is explanatory drawing of the misalignment by pulley deviation. It is explanatory drawing of the misalignment by pulley fall. It is explanatory drawing of how to obtain | require misalignment amount. It is a figure which shows the pulley layout of the belt running test machine which concerns on a heat-resistant running test. It is a figure which shows the pulley layout of the belt running test machine which concerns on a misalignment abnormal noise durability test. It is a figure which shows the pulley layout of the belt running test machine which concerns on a 6% forced slip wear test.

  Hereinafter, the present embodiment will be described in detail with reference to the drawings.

(V-ribbed belt)
FIG. 1 shows a V-ribbed belt B according to this embodiment. The V-ribbed belt B is used, for example, in an accessory drive belt transmission device provided in an engine room of an automobile, and has a belt circumferential length of 700 to 3000 mm, a belt width of 10 to 36 mm, and a belt thickness of 4.0 to 4.0. It is formed to 5.0 mm.

  The V-ribbed belt B includes a belt main body 10 configured as a double layer of an adhesive rubber layer 11 on the belt outer peripheral side and a compression rubber layer 12 on the belt inner peripheral side. And the back side reinforcement cloth 17 is stuck on the belt outer peripheral side surface of the belt main body 10. A rib-side knitted reinforcing cloth 14 is provided on the inner peripheral surface of the belt body 10. Moreover, the core 16 is embedded in the adhesive rubber layer 11 so as to form a spiral having a pitch in the belt width direction.

  The adhesive rubber layer 11 is formed in a band shape having a horizontally long cross section, and has a thickness of 1.0 to 2.5 mm, for example. The adhesive rubber layer 11 is formed of a rubber composition in which various compounding agents are blended with the raw rubber component. Examples of the raw rubber component of the rubber composition constituting the adhesive rubber layer 11 include ethylene-α-olefin elastomers such as ethylene / propylene rubber (EPR) and ethylene propylene diene monomer rubber (EPDM), chloroprene rubber (CR), Examples include chlorosulfonated polyethylene rubber (CSM) and hydrogenated acrylonitrile rubber (H-NBR). Among these, an ethylene-α-olefin elastomer is preferable from the viewpoint of exhibiting excellent properties in terms of heat resistance and cold resistance. Examples of the compounding agent include a crosslinking agent (for example, sulfur, organic peroxide), an anti-aging agent, a processing aid, a plasticizer, a reinforcing material such as carbon black, a filler, and the like. Although the short fiber may be mix | blended with the rubber composition which comprises the adhesive rubber layer 11, it is preferable that the short fiber is not mix | blended from the point of adhesiveness with the core wire 16. FIG. The rubber composition for forming the adhesive rubber layer 11 is obtained by heating and pressurizing an uncrosslinked rubber composition obtained by blending a raw material rubber component with a compounding agent and kneading it, and then crosslinking with a crosslinking agent.

  The core wire 16 is embedded in the adhesive rubber layer 11 so as to extend in the belt length direction and to form a spiral having a pitch in the belt width direction. The core wire 16 is composed of a twisted yarn 16 'such as polyester fiber, polyethylene naphthalate (PEN) fiber, aramid fiber, vinylon fiber, polyketone fiber. The core wire 16 has an outer diameter of 0.7 to 1.1 μm, for example. The core wire 16 is subjected to an adhesive treatment that is heated after being immersed in an RFL aqueous solution before forming and / or an adhesive treatment that is dried after being immersed in rubber paste in order to impart adhesion to the belt body 10.

  The compression rubber layer 12 is provided such that a plurality of V ribs 13 hang down to the belt inner peripheral side. Each of the plurality of V ribs 13 is formed in a protruding shape having a substantially triangular cross section extending in the belt length direction, and is arranged in parallel in the belt width direction. Each V rib 13 is formed, for example, with a rib height of 2.0 to 3.0 mm and a width between base ends of 1.0 to 3.6 mm. Moreover, the number of ribs is 3-6, for example (in FIG. 1, the number of ribs is 6).

  The compressed rubber layer 12 is formed of a rubber composition in which various compounding agents are blended with the raw rubber component. Examples of the raw rubber component of the rubber composition constituting the compressed rubber layer 12 include ethylene-α-olefin elastomers such as ethylene / propylene rubber (EPR) and ethylene propylene diene monomer rubber (EPDM), chloroprene rubber (CR), Examples include chlorosulfonated polyethylene rubber (CSM) and hydrogenated acrylonitrile rubber (H-NBR). Among these, an ethylene-α-olefin elastomer is preferable from the viewpoint of exhibiting excellent properties in terms of heat resistance and cold resistance. Examples of the compounding agent include cross-linking agents (for example, sulfur and organic peroxides), anti-aging agents, processing aids, plasticizers, reinforcing materials such as carbon black, fillers, short fibers, and the like. The rubber composition for forming the compressed rubber layer 12 is obtained by heating and pressurizing an uncrosslinked rubber composition obtained by blending a raw material rubber component with a compounding agent and kneading, and then crosslinking with a crosslinking agent.

  As short fiber mix | blended with the rubber composition which comprises the compression rubber layer 12, nylon short fiber, vinylon short fiber, aramid short fiber, polyester short fiber, cotton short fiber etc. are mentioned, for example. The short fiber has a length of 0.2 to 5.0 mm and a fiber diameter of 10 to 50 μm, for example. The short fiber is manufactured by, for example, cutting a long fiber that has been subjected to an adhesion treatment to be heated after being immersed in an RFL aqueous solution or the like into a predetermined length along the length direction. A part of the short fibers may be dispersedly exposed on the surface of the V-rib 13, and the short fibers exposed on the surface of the V-rib 13 may protrude from the surface of the V-rib 13.

  The adhesive rubber layer 11 and the compressed rubber layer 12 may be formed of separate rubber compositions or may be formed of the same rubber composition.

  A rib-side knitted reinforcing cloth 14 is provided on the surface of the belt body 10 on the V-rib 13 side via a rib surface rubber layer 15.

  The rib-side knitted reinforcing cloth 14 is covered with, for example, a woolen yarn obtained by false twisting (woolie processing) of polyamide fiber, polyester fiber, cotton, nylon fiber, aramid fiber or the like, or polyurethane elastic yarn as a core yarn. Covering yarn covered with yarn is knitted fabric. The rib side knit reinforcing cloth 14 has a thickness of 0.1 to 0.8 mm, for example. The rib-side knitted reinforcing fabric 14 has an elongation rate in the belt length direction of 100 to 100 mm when a strip test piece (however, a 3 cm wide test piece is used here) is loaded with a load of 50 N in accordance with JIS L1018. 500% and the elongation in the belt width direction is 150 to 500%, preferably the elongation in the belt length direction is 150 to 350% and the elongation in the belt width direction is 200 to 350. %.

  If the elongation in the belt length direction of the rib-side knit reinforcing cloth 14 is less than 100%, the rib-side knit reinforcing cloth 14 cannot catch up with the curvature on the V-rib 13 side when bent in the opposite direction, and the rib-side knit reinforcing cloth 14 becomes V-rib 13. Will peel off. If the elongation ratio in the belt width direction of the rib-side knit reinforcing cloth 14 is less than 150%, the rib-side knit reinforcing cloth 14 becomes insufficiently stretched when the V-rib 13 is formed. It cannot be formed along the rib 13. When the rib-side knit reinforcing cloth 14 does not extend along the V-rib 13, the rubber component of the compressed rubber layer 12 soaks into the pulley contact portion beyond the rib-side knit reinforcing cloth 14, and the friction coefficient of the pulley contact portion. An abnormal noise occurs due to the increase of.

  Further, if the respective elongation percentages in the belt length direction and the belt width direction of the rib-side knit reinforcing cloth 14 exceed 500%, in the course of manufacturing the V-ribbed belt B, crosslinking is performed by heating the uncrosslinked rubber component. When this occurs, the rubber component flows, and at the same time, wrinkles are generated at the pulley contact portion, resulting in a defective product.

  In the case where the rib-side knitted reinforcing cloth 14 is made of woolly processed yarn, it is preferable that the wooly processed yarn is obtained by false twisting with high crimp. Moreover, it is preferable that the rib side knit reinforcement cloth 14 is comprised by the polyamide fiber or the polyester fiber from a viewpoint which shows the property outstanding in the point of heat resistance and abrasion resistance. The rib-side knitted reinforcing cloth 14 has, for example, 55 to 80 courses / inch in the longitudinal direction and 40 to 60 wells / inch in the lateral direction.

  When the rib-side knitted reinforcing cloth 14 is composed of a covering yarn, the covering yarn may be a single covered yarn or a double covered yarn. Examples of the covering yarn include polyamide fiber and aramid. Examples thereof include twin yarns and false twisted yarns made of chemical fibers such as fibers, polyester fibers, and ultrahigh molecular weight polyethylene fibers. The covering yarn of the covering yarn may be composed of a single type of fiber or a plurality of types of fibers. Since the covering yarn constituting the rib-side knitted reinforcing cloth 14 is made of a covering yarn made of a chemical fiber excellent in wear resistance such as a polyamide fiber, an aramid fiber, a polyester fiber, or an ultrahigh molecular weight polyethylene fiber, the belt Excellent wear characteristics can be obtained during running.

  The rib-side knitted reinforcing cloth 14 is preferably coated on the fiber surface with an RFL layer (not shown).

  The RFL layer contains a friction coefficient reducing agent dispersed therein. Examples of the friction coefficient reducing agent include polytetrafluoroethylene (PTFE), tetrafluoroethylene / ethylene copolymer (ETFE), tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer (PFA), and tetrafluoroethylene / hexafluoro. A propylene copolymer (FEP) etc. are mentioned. Of these, it is preferable that polytetrafluoroethylene (PTFE) particles are blended as the friction coefficient reducing agent. For example, polytetrafluoroethylene has an average particle diameter of 0.1 to 0.5 μm. The content of polytetrafluoroethylene is preferably 10 to 50 parts by mass, and more preferably 20 to 40 parts by mass with respect to 100 parts by mass of the RFL solid content of the RFL layer. If the content of polytetrafluoroethylene is less than 10 parts by mass with respect to 100 parts by mass of the RFL solid content, the friction coefficient of the pulley contact part becomes large and abnormal noise is likely to occur. On the other hand, if it exceeds 50 parts by mass, the friction coefficient becomes too low, and the V-ribbed belt B does not show sufficient transmission capability.

  Since the rib-side knitted reinforcing cloth 14 is surface-coated with an RFL layer containing a friction coefficient reducing agent, even if it is used in an environment where dust or rust is generated, the rib-side knitted reinforcing cloth 14 has dust even inside the rib-side knitted reinforcing cloth 14. No rust and rust adherence, and a low friction coefficient state can be maintained. Therefore, it is possible to prevent the friction coefficient from increasing and the belt from being worn out at an early stage, or the generation of abnormal noise due to the large friction coefficient.

  The rib-side knitted reinforcing cloth 14 is preferably provided on the belt inner peripheral surface of the belt body 10 via the rib surface rubber layer 15.

  The rib surface rubber layer 15 is formed of a rubber composition in which various compounding agents are blended with the raw rubber component. Examples of the raw rubber component of the rubber composition constituting the rib surface rubber layer 15 include ethylene-α-olefin elastomers such as ethylene / propylene rubber (EPR) and ethylene propylene diene monomer rubber (EPDM), and chloroprene rubber (CR). Chlorosulfonated polyethylene rubber (CSM), hydrogenated acrylonitrile rubber (H-NBR), and the like. Among these, an ethylene-α-olefin elastomer is preferable from the viewpoint of exhibiting excellent properties in terms of heat resistance and cold resistance. The rib surface rubber layer 15 preferably has a thickness of 0.05 to 0.8 mm, for example.

  The rubber composition forming the rib surface rubber layer 15 is blended with a friction coefficient reducing agent. Examples of the friction coefficient reducing agent include surfactants such as fluorine compounds such as ultrahigh molecular weight polyethylene, montmorillonite, polytetrafluoroethylene (PTFE), molybdenum disulfide, graphite, titanium oxide, polyethylene glycol (PEG) laurate, etc. Etc.

  When ultrahigh molecular weight polyethylene is blended as a friction coefficient reducing agent, for example, blending is performed so that particles having a molecular weight of 1,000,000 to 7,000,000 are dispersed. Ultra high molecular weight polyethylene has a particle size of, for example, 50 to 200 μm.

  The total amount of the friction coefficient reducing agent is, for example, preferably 5 to 100 parts by mass, more preferably 30 to 60 parts by mass with respect to 100 parts by mass of the raw rubber. If the blending amount of the friction coefficient reducing agent is less than 5 parts by mass with respect to 100 parts by mass of the raw rubber component, the low friction coefficient state cannot be maintained. On the other hand, if it exceeds 100 parts by mass, the flexibility of the rubber as a whole may deteriorate and cracks may occur on the rib surface.

  As a compounding agent mix | blended with the rubber composition which forms the rib surface rubber layer 15, in addition to a friction coefficient reducing agent, for example, a crosslinking agent (for example, sulfur, organic peroxide), an anti-aging agent, a processing aid, Examples thereof include reinforcing materials such as plasticizers and carbon black, and fillers.

  As shown in FIG. 2, it is preferable that the rubber composition forming the rib surface rubber layer 15 oozes out from the stitches of the rib side knit reinforcing cloth 14 and is partially exposed on the pulley contact surface. In this case, even when the V-ribbed belt is new, the friction coefficient reducing agent is present in the pulley contact portion, and the friction coefficient can be maintained at a low level of about 0.5 to 0.8 for a long time from the start of traveling. it can.

  The back-side reinforcing cloth 17 is composed of a woven cloth 17 ′ woven in plain weave, twill weave, satin weave or the like formed of, for example, cotton, polyamide fiber, polyester fiber, aramid fiber or the like. The back side reinforcing cloth 17 has a thickness of 0.4 mm, for example. The back side reinforcing cloth 17 is coated with rubber paste on the surface on the side of the belt body 10 and / or an adhesive treatment in which it is immersed in an RFL aqueous solution and heated before forming to give adhesion to the belt body 10. Adhesive treatment for drying is applied. In addition, the belt outer peripheral side surface part may be comprised with the rubber composition instead of the back side reinforcement cloth 17. FIG. Moreover, the back side reinforcement cloth 17 may be comprised with the knitted fabric or the nonwoven fabric.

  According to the above configuration, the rib-side knitted reinforcing cloth 14 has an elongation rate of 100 to 500% in the belt length direction when a load of 50 N is applied to a strip-shaped test piece having a width of 3 cm, and an elongation in the belt width direction. Since the rate is 150 to 500%, the pulley contact portion can be maintained in a state where the friction coefficient is as low as about 0.5 to 0.8 without impairing the heat resistance. A sound generation suppressing effect can be obtained.

(Method for producing V-ribbed belt)
A method for manufacturing the V-ribbed belt B will be described with reference to FIGS.

  In the manufacturing method of the V-ribbed belt B, the belt forming apparatus 20 is used. This belt forming apparatus 20 is composed of a cylindrical rubber sleeve mold 21 and a cylindrical outer mold 22 into which it is fitted. The rubber sleeve mold 21 is a flexible one made of, for example, acrylic rubber. The rubber sleeve mold 21 is inflated radially outward by a method such as sending high-temperature steam from the inside of the cylinder, and is pressed against the cylindrical outer mold 22. Can be made. The outer peripheral surface of the rubber sleeve mold 21 has, for example, a shape for smoothly molding the surface on the back side of the V-ribbed belt B. The rubber sleeve mold 21 has, for example, an outer diameter of 700 to 800 mm, a thickness of 8 to 20 mm, and a height of 500 to 1000 mm. The cylindrical outer die 22 is made of, for example, metal, and a protrusion 22a having a substantially triangular cross section for forming the V rib 13 of the V ribbed belt B extends on the inner side in the height direction while extending in the circumferential direction. They are arranged side by side. For example, 140 protrusions 22a are provided side by side in the height direction. The cylindrical outer mold 22 has, for example, an outer diameter of 830 to 2930 mm, an inner diameter (not including the protrusion 22a) of 730 to 2830 mm, a height of 500 to 1000 mm, and a height of the protrusion 22a of 2.0 to 2.0. The width per 2.5 mm and the protrusion 22a is 3.5 to 3.6 mm.

  First, the belt material, that is, the adhesive rubber material 11 ′ and the compressed rubber material 12 ′, which are uncrosslinked rubber sheets for forming the adhesive rubber layer 11 and the compressed rubber layer 12, the rib side knit reinforcing cloth 14 and the back side reinforcing cloth. A knitted fabric 14 ′ and a woven fabric 17 ′ for forming 17 and a twisted yarn 16 ′ for forming the core wire 16 are prepared.

  The adhesive rubber material 11 ′ is obtained by kneading the raw rubber and compounding agent of the adhesive rubber layer 11 with a kneader to obtain a bulk uncrosslinked rubber composition, and using a calender roll, for example, with a thickness of 0.4 Processed into a sheet shape of ˜0.8 mm.

  The compressed rubber material 12 ′ is obtained by kneading the raw rubber and compounding agent of the compressed rubber layer 12 with a kneader to obtain a bulk uncrosslinked rubber composition, which is, for example, 0.6 mm thick using a calender roll. Processed into a sheet shape of ˜1.0 mm.

  The knit cloth 14 ′ for forming the rib-side reinforcing cloth 14 includes an adhesion process of heating after impregnating the RFL aqueous solution, and a process of applying a rubber paste to one surface of the knit cloth 14 ′ to provide a rubber paste layer. Use what you did.

  The RFL aqueous solution for treating the knitted cloth 14 'is a mixed solution in which latex is mixed with an initial condensate of resorcin and formalin. About solid content of RFL aqueous solution, it is 10-30 mass%, for example. The molar ratio of resorcin (R) to formalin (F) is, for example, R / F = 1/1 to 1/2. Examples of the latex include ethylene propylene diene monomer rubber latex (EPDM), ethylene propylene rubber latex (EPR), chloroprene rubber latex (CR), chlorosulfonated polyethylene rubber latex (CSM), hydrogenated acrylonitrile rubber latex (X-NBR). ) And the like. About mass ratio of the initial condensate (RF) of resorcinol and formalin, and latex (L), it shall be RF / L = 1/5-1/20, for example. In this RFL aqueous solution, a friction coefficient reducing agent such as polytetrafluoroethylene (PTFE) is blended in an amount of, for example, 10 to 50 parts by mass with respect to 100 parts by mass of the RFL solid content.

  After the knit cloth 14 'is immersed in this aqueous RFL solution, it is heated and dried at 120 to 170 ° C. using a drying furnace, whereby the water in the RFL aqueous solution is scattered and the condensation reaction between resorcin and formalin proceeds. An RFL layer is formed to cover the surface of 14 '. For example, the RFL layer has an adhesion amount of 5 to 30 parts by mass with respect to 100 parts by mass of the knit cloth 14 ′.

  After performing an RFL adhesion treatment for forming an RFL layer on the surface of the knitted cloth 14 ', rubber paste 15' for forming the rib surface rubber layer 15 is applied to one side of the knitted cloth 14 '. This rubber paste 15 'was prepared by blending various blends containing a friction coefficient reducing agent with raw rubber, kneading with a kneader to obtain a rubber composition, and dissolving it in a solvent such as toluene. It is.

  The rubber paste 15 'thus prepared is applied to one side of the knit cloth 14' using, for example, a knife coater. At this time, the applied thickness is, for example, 50 to 200 μm.

  If the knit cloth 14 ′ subjected to these treatments is formed into a cylindrical shape by a known method, it can be easily set in the rubber sleeve mold 21. In this case, molding is performed so that the surface to which the rubber paste 15 ′ is applied is on the inside.

  As the woven fabric 17 ′ for forming the back-side reinforcing fabric 17, in order to improve the adhesion to the belt body 10, it is immersed in an RFL aqueous solution and then heated and / or immersed in rubber paste. The one that has been subjected to an adhesive treatment to be dried is used.

  If the woven fabric 17 ′ subjected to these treatments is formed into a cylindrical shape by a known method, it can be easily set in the rubber sleeve mold 21.

  Next, belt materials are sequentially set on the rubber sleeve mold 21. After the tubular woven fabric 17 ′ is fitted to the rubber sleeve, the sheet-like adhesive rubber material 11 ′ is wound and a plurality of twisted yarns 16 ′ are wound so as to extend in the circumferential direction. At this time, the twisted yarn 16 ′ is wound so as to form a spiral having a pitch in the height direction of the rubber sleeve mold 21. Next, the sheet-like adhesive rubber material 11 ′ is wound around the twisted yarn 16 ′, and further the sheet-like pressure-bonded rubber material 12 ′ is wound. Then, a tubular knit cloth 14 ′ with rubber paste 15 ′ applied from the top to the inner surface of the pressure-bonded rubber material 12 ′ is fitted. At this time, as shown in FIG. 3, the woven fabric 17 ′, the adhesive rubber material 11 ′, the twisted yarn 16 ′, the adhesive rubber material 11 ′, the compressed rubber material 12 ′, and the rubber paste 15 are counted in order from the rubber sleeve 21. In this state, “and knitted cloth 14” are laminated. Further, a cylindrical outer mold 22 is attached to the outside thereof.

  Subsequently, with the cylindrical outer mold 22 attached to the rubber sleeve mold 21, for example, high-temperature water vapor is fed into the rubber sleeve mold 21 to apply heat and pressure, and the rubber sleeve mold 21 is inflated to form the cylindrical outer mold 22. The belt material is sandwiched between the rubber sleeve mold 21 and the cylindrical outer mold 22 by pressure contact. At this time, the temperature of the belt material is, for example, 150 to 180 ° C., and a pressure of 0.5 to 1.0 MPa is applied outward in the radial direction. For this reason, the rubber component flows and the crosslinking reaction proceeds, the adhesion reaction of the knitted fabric 14 ', the twisted yarn 16' and the woven fabric 17 'to the rubber component also proceeds, and further, the cylindrical outer portion forming the V rib 13 is formed. V-grooves between the V ribs 13 are formed by the protrusions 22a on the inner surface of the mold 22. Simultaneously with the crosslinking reaction, the rubber paste 15 'is exposed from the stitches of the knitted cloth 14'. In this way, a belt slab with a V rib (belt body precursor) is formed.

  Finally, the V-ribbed belt slab is cooled and then removed from the belt forming apparatus 20. The removed V-ribbed belt slab is cut into a width of, for example, 10.68 to 28.48 mm, and then turned upside down. As a result, a V-ribbed belt B is obtained.

  According to the above manufacturing method, the cross-linking reaction of the uncrosslinked rubber component of the V-ribbed belt B, the adhesion reaction between the rubber component and the fiber component, and the molding of the V-rib 13 can be performed at the same time. it can.

  In this embodiment, the cylindrical knit cloth 14 ′ and the woven cloth 17 ′ are fitted and set in the rubber sleeve mold 21. However, the knit cloth 14 ′ and the woven cloth 17 ′ subjected to a predetermined adhesion treatment are set. You may make it wind around the rubber sleeve type | mold 21 with a sheet form. Further, the sheet-like adhesive rubber material 11 ′ and the compressed rubber material 12 ′ are wound and set around the rubber sleeve mold 21, but a cylindrical shape previously formed may be fitted into the rubber sleeve mold 21 and set.

  The belt forming apparatus 20 has been described as having a V groove for forming the V rib 13 of the V ribbed belt B on the inner surface of the cylindrical outer mold 22, but is not particularly limited thereto. For example, a protrusion for forming the V rib 13 of the V-ribbed belt B is provided on the outer peripheral side surface of the rubber sleeve mold, and the inner peripheral surface of the cylindrical outer mold 22 is smooth to form the back surface of the V-ribbed belt B. It may be provided. In this case, the knitted cloth 14 ', the compressed rubber material 12', the adhesive rubber material 11 ', the twisted yarn 16', the adhesive rubber material 11 ', and the woven cloth 17' are wound around the rubber sleeve mold 21 in this order.

  In this embodiment, the rib surface rubber layer 15 is provided by applying the rubber paste 15 ′ to the knit cloth 14 ′. However, the present invention is not limited to this, and an uncrosslinked rubber composition formed into a sheet shape. May be provided by winding the knitted cloth 14 ′ on the rubber sleeve mold 21 of the belt forming apparatus 20 and then winding it.

  Next, an auxiliary machine drive belt transmission device 50 provided in an engine room of an automobile using the V-ribbed belt B will be described.

  FIG. 5 shows the pulley layout of the accessory drive belt transmission 50. This accessory drive belt transmission device 50 is of a serpentine drive type wound around six pulleys of four rib pulleys and two flat pulleys.

  The layout of the auxiliary drive belt transmission 50 includes an uppermost power steering pulley 51, a generator pulley 52 disposed below the power steering pulley 51, and a flat pulley disposed on the lower left side of the power steering pulley 51. Tension pulley 53, a flat pulley water pump pulley 54 disposed below the tensioner pulley 53, a crankshaft pulley 55 disposed on the lower left side of the tensioner pulley 53, and a lower right side of the crankshaft pulley 55. The air conditioner pulley 56 is arranged. Among these, all except the tensioner pulley 53 and the water pump pulley 54 which are flat pulleys are rib pulleys. Then, the V-ribbed belt B is wound around the power steering pulley 51 so that the V-rib 13 side contacts, and then wound around the tensioner pulley 53 so that the back surface of the belt contacts, and then the V-rib 13 side contacts. Are wound around the crankshaft pulley 55 and the air conditioner pulley 56 in turn, further wound around the water pump pulley 54 so that the back of the belt contacts, and then wound around the generator pulley 52 so that the V-rib 13 side contacts. Finally, it is provided so as to return to the power steering pulley 51. In the accessory drive belt transmission 50, for example, the belt span length between the power steering pulley 51 and the generator pulley 52 is 150 mm, and the belt span length between the crankshaft pulley 55 and the air conditioner pulley 56 is 180 mm. It is. Here, the belt span length is the distance between the contact points of a common tangent line in a pair of pulleys around which a V-ribbed belt is wound adjacent to each other (published by Yokendo “Practical design of belt transmission and precision conveyance belt transmission” "Technical Social Meeting", page 39).

  In the auxiliary drive belt transmission device 50 configured as described above, since the V-ribbed belt B of the present invention is wound and used, the low friction coefficient state is maintained at the pulley contact portion over a long period from the start of belt running. As a result, an excellent noise suppression effect can be obtained. Further, as the accessory drive belt transmission 50 is made compact, the belt span length is reduced and misalignment between the pulleys is likely to occur. Even in this case, by using the V-ribbed belt B, The occurrence of abnormal noise due to misalignment can be kept small.

Misalignment is caused by a pulley shift as shown in FIG. 6 with respect to one of the pair of rib pulleys P1 and P2 and a pulley collapse as shown in FIGS. 7 (a) and 7 (b). As shown in FIG. 8, the misalignment amount α is measured by measuring the inter-axis position C in a state where a V-ribbed belt B is wound around the rib pulleys P1 and P2 and given a predetermined axial load, and one rib pulley at the axial position is measured. The deviation ΔC in the front-rear direction of the other rib pulley P2 with respect to P1 is measured, and is obtained as α = tan ⁻¹ (ΔC / C) (published by Yokendo “Practical design of belt transmission and precision conveyance” "Pages 64 and 65).

  V-ribbed belts of Examples 1 to 12 and Comparative Examples 1 to 3 were produced and subjected to test evaluation. Each configuration is also shown in Table 1.

(Test evaluation belt)
<Adhesive rubber material>
As an adhesive rubber material for forming the adhesive rubber layer, EPDM (manufactured by JSR, trade name: JSR EP123) is used as a raw rubber, and carbon black (trade name, manufactured by Asahi Carbon Co., Ltd.) is used with respect to 100 parts by mass of the raw rubber. : Asahi # 60) 50 parts by mass, plasticizer (manufactured by Nippon Sun Oil Co., Ltd., trade name: Sunflex 2280), 15 parts by mass, crosslinking agent (manufactured by Nippon Oil & Fats Co., Ltd., trade name: Park Mill D), 8 parts by mass, anti-aging agent (Trade name: Antage MB, manufactured by Kawaguchi Chemical Industry Co., Ltd.) 3 parts by mass, 6 parts by mass of zinc oxide (trade name: zinc oxide type 2), and stearic acid (manufactured by Kao Corporation, product name: stearin) Acid) An unvulcanized rubber composition was prepared by blending 1 part by mass and kneading. This uncrosslinked rubber composition was processed into a sheet having a thickness of 0.4 mm using a roll.

<Compression rubber material>
As a compression rubber material for forming the compression rubber layer, EPDM is used as a raw rubber, and 100 parts by mass of the raw rubber, 55 parts by mass of carbon black, 15 parts by mass of a plasticizer, 8 parts by mass of a crosslinking agent, an anti-aging agent An unvulcanized rubber composition was prepared by blending 3 parts by mass, 6 parts by mass of zinc oxide and 1 part by mass of stearic acid. This uncrosslinked rubber composition was processed into a 1 mm thick sheet using a roll.

<RFL aqueous solution>
Resorcin (R) and formalin (F) were mixed, an aqueous sodium hydroxide solution was added and stirred, and aged for 2 hours to obtain an RF initial condensate (R / F molar ratio = 1 / 1.5). . And after mixing VP latex (L) with RF initial condensate so that it may become RF / L mass ratio = 1/8, and also adding water and adjusting so that it may become solid content concentration 20%, further RFL solid 30 parts by mass of PTFE dispersion solution (manufactured by AGC Co., Ltd., trade name: full-on PTFE AD911, PTFE average particle size 0.25 μm, containing 60% by mass of PTFE) is mixed with 100 parts by mass of the mixture, and stirred for 24 hours to perform PTFE A containing RFL aqueous solution was prepared.

<Rubber glue>
The following rubber pastes (1) to (6) were prepared as rubber pastes for forming the rib surface rubber layer.

-Rubber glue (1)-
With EPDM as raw material rubber, 40 parts by mass of carbon black, 15 parts by mass of plasticizer, 8 parts by mass of cross-linking agent, 3 parts by mass of anti-aging agent, 6 parts by mass of zinc oxide, and 1 part of stearic acid are used. An unvulcanized rubber composition prepared by mixing and kneading 50 parts by mass of ultra-high molecular weight polyethylene (trade name: Hi-Zex Million 240S, manufactured by Mitsui Chemicals, Inc.) was dissolved in a toluene solvent.

-Rubber glue (2)-
A rubber paste composed of the same components as the rubber paste (1) was prepared except that polytetrafluoroethylene (PTFE) (manufactured by AGC, trade name: Fullon PTFE L173J) was blended in place of the ultrahigh molecular weight polyethylene.

-Rubber paste (3)-
A rubber paste comprising the same components as the rubber paste (1) was prepared except that montmorillonite (manufactured by Hojun Co., Ltd., trade name: Bengel HVP) was blended in place of the ultrahigh molecular weight polyethylene.

-Rubber glue (4)-
A rubber paste comprising the same components as the rubber paste (1) was prepared except that titanium oxide (trade name: A-100, manufactured by Ishihara Sangyo Co., Ltd.) was blended in place of the ultrahigh molecular weight polyethylene.

-Rubber paste (5)-
A rubber paste comprising the same components as the rubber paste (1) was prepared except that graphite (manufactured by Nippon Graphite Industry Co., Ltd., trade name: UP-10) was blended in place of the ultrahigh molecular weight polyethylene.

-Rubber paste (6)-
A rubber paste composed of the same components as the rubber paste (1) except that polyethylene glycol (PEG) lauric acid ester (manufactured by Matsumoto Yushi Seiyaku Co., Ltd., trade name: TB-202) is blended in place of ultrahigh molecular weight polyethylene. Prepared.

<Example 1>
A V-ribbed belt was manufactured using a belt forming apparatus 20 including a rubber sleeve mold 21 for forming the back surface of the belt into a predetermined shape and a cylindrical outer mold 22 for forming the inside of the belt into a predetermined shape. . The cylindrical outer mold 22 was provided with protrusions 22 a for forming V-ribs on the belt in the circumferential direction inside the cylindrical outer mold 22.

  As a material constituting the V-ribbed belt, an adhesive rubber material, a compressed rubber material, a knit cloth, a knitted cloth and a twisted yarn coated with rubber glue on one side were prepared.

  The rib-side knitted reinforcing fabric covering the V-rib surface was a knitted fabric made of polyester yarn (84 dtex) that had been subjected to Wool processing to a high crimp. This rib-side knitted reinforcing cloth was preliminarily subjected to an RFL adhesion treatment in which it was immersed in the prepared PTFE-containing RFL aqueous solution and then dried by heating. The number of stitches per inch square of this rib-side knitted reinforcing fabric is 64 in length and 39 in width, and the elongation when a load of 50 N is applied to a strip-shaped test piece with a width of 3 cm is the belt length direction. 250% and 250% in the belt width direction. And the rubber paste (1) for forming a rib surface rubber layer was apply | coated to the single side | surface of a knit cloth.

  First, the rubber sleeve mold 21 of the belt molding apparatus 20 is wound with the back side reinforcing cloth, the unvulcanized rubber material for forming the back side of the belt body, and the twisted yarn in order, and then the V rib side of the belt body is formed. The unvulcanized rubber material to be used and the rib-side knit reinforcing cloth subjected to the above-described adhesion treatment were wound. Then, the cylindrical outer mold 22 provided with the V-groove was expanded and pressed against the rubber sleeve mold 21 side, and the rubber sleeve mold 21 was heated with high-temperature steam. At this time, the rubber component flowed and the crosslinking reaction proceeded. In addition, the adhesion reaction of the twisted yarn, the back-side reinforcing fabric, and the rib-side knit reinforcing fabric to the rubber also proceeded. Thereby, a cylindrical belt precursor was obtained.

  The belt precursor was removed from the belt forming apparatus 20, cut into a width of 10.68 mm in the length direction, and turned upside down to obtain a V-ribbed belt. The V-ribbed belt thus obtained was referred to as Example 1.

<Example 2>
A V-ribbed belt having the same configuration as that of Example 1 was prepared except that the rib surface rubber layer was not formed.

<Example 3>
A V-ribbed belt having the same configuration as in Example 1 was prepared except that the RFL adhesion treatment was not performed on the rib-side knitted reinforcing cloth covering the V-rib surface.

<Example 4>
A V-ribbed belt having the same configuration as that of Example 2 was produced except that the RFL adhesion treatment was not performed on the rib-side knitted reinforcing cloth covering the V-rib surface.

<Example 5>
Example except that a knitted fabric made of a single covered yarn in which the core yarn is a polyurethane elastic yarn (22 dtex) and the covering yarn is a nylon yarn (78 dtex) is used as the rib side knit reinforcing fabric covering the V rib surface. A V-ribbed belt having the same configuration as that of No. 1 was produced. The number of stitches per inch square of this rib-side knitted reinforcing fabric is 75 in length and 55 in width, and the elongation when a load of 50 N is applied to a strip-shaped test piece with a width of 3 cm is the belt length The width direction was 350% and the belt width direction was 350%.

<Example 6>
Except that a knitted fabric made of a single covered yarn in which the core yarn is a polyurethane elastic yarn (22 dtex) and the covering yarn is an ultra-high molecular weight polyethylene yarn (85 dtex) is used as the rib-side knit reinforcing fabric covering the V-rib surface. Thus, a V-ribbed belt having the same configuration as that of Example 2 was produced. The number of stitches per inch square of this rib-side knitted reinforcing fabric is 75 in length and 55 in width, and the elongation when a load of 50 N is applied to a strip-shaped test piece with a width of 3 cm is the belt length The width direction was 350% and the belt width direction was 350%.

<Example 7>
As a rib-knit reinforcing fabric covering the V-rib surface, a double-covered fabric with polyurethane elastic yarn (22 dtex) as the core yarn, covered with ultra high molecular weight polyethylene yarn (85 dtex) and further covered with nylon yarn (78 dtex) A V-ribbed belt having the same configuration as in Example 2 was produced except that a knitted fabric made of yarn was used. The number of stitches per inch square of the rib-side knitted reinforcing fabric is 65 in length and 45 in width, and the elongation when a load of 50 N is applied to a strip-shaped test piece having a width of 3 cm is the belt length. The length direction was 300% and the belt width direction was 300%.

<Example 8>
A V-ribbed belt having the same configuration as that of Example 3 was prepared except that rubber paste (2) was used for forming the rib surface rubber layer.

<Example 9>
A V-ribbed belt having the same configuration as that of Example 3 was prepared except that rubber paste (3) was used for forming the rib surface rubber layer.

<Example 10>
A V-ribbed belt having the same configuration as that of Example 3 was prepared except that rubber paste (4) was used for forming the rib surface rubber layer.

<Example 11>
A V-ribbed belt having the same configuration as that of Example 3 was prepared except that rubber paste (5) was used for forming the rib surface rubber layer.

<Example 12>
A V-ribbed belt having the same configuration as that of Example 3 was prepared except that rubber paste (6) was used for forming the rib surface rubber layer.

<Comparative Example 1>
A V-ribbed belt having the same configuration as that of Example 1 except that a knitted fabric covered with a nylon yarn (78 dtex) as a core yarn is used as a rib-side knit reinforcing fabric covering the V-rib surface. This was used as Comparative Example 1. The number of stitches per inch square of this rib-side knitted reinforcing fabric is 85 in length and 75 in width, and the elongation when a load of 50 N is applied to a strip-shaped test piece having a width of 3 cm is the belt length. The length direction was 550% and the belt width direction was 550%.

<Comparative example 2>
A V-ribbed belt having the same configuration as that of Example 2 was prepared except that polyester (84 dtex) was used as a knitted fabric as a rib-side knitted reinforcing cloth covering the V-rib surface. It was set as Comparative Example 2. The number of stitches per inch square of this rib-side knitted reinforcing fabric is 40 in length and 25 in width, and the elongation when a load of 50 N is applied to a strip-shaped test piece with a width of 3 cm is the belt length The length direction was 100% and the belt width direction was 100%.

  In this V-ribbed belt, it was observed that the belt main body rubber oozed from the rib-side knit reinforcing cloth provided on the surface of the V-rib, and the fibers of the rib-side knit reinforcing cloth were buried in the rubber.

<Comparative Example 3>
A V-ribbed belt having the same configuration as that of Example 2 was prepared except that the surface of the V-rib was not covered with the rib-side knit reinforcing cloth.

(Test evaluation method)
<Heat resistance running test>
FIG. 9 shows a pulley layout of the belt running tester 90 in the heat resistant running test.

  The belt running test machine 90 includes large-sized rib pulleys 91 and 92 (upper side is driven pulley and lower side is driving pulley, both have a pulley diameter of 120 mm) and idler pulley 93 provided in the middle in the vertical direction. (Pulley diameter 70 mm) and a small-diameter driven rib pulley 94 (pulley diameter 45 mm) provided on the right side of the idler pulley 93, and the winding angle of the back surface of the V-ribbed belt in the idler pulley 93 is 90 °. As described above, the winding angle of the V-ribbed belt B in the small-diameter driven rib pulley 94 is 90 °. The V-ribbed belt B is wound around the belt running test machine 90 so that the V-rib contacts the rib pulleys 91 and 92 and the rib pulley 94 and the back side contacts the idler pulley 93.

  For each of the V-ribbed belts of Examples 1 to 12 and Comparative Examples 1 to 3, set the belt running tester 90 and load a set weight laterally to the small-diameter driven rib pulley 94 so that the belt tension of 200 N is applied. Then, the belt was run by rotating the drive rib pulley 92 at a rotational speed of 4900 rpm under an atmospheric temperature of 120 ° C. The running time until a crack occurred in the V rib of the V-ribbed belt was measured, and the running of the belt was terminated when 500 hours passed from the start of the running of the belt.

<Misalignment noise endurance test>
FIG. 10 shows a pulley layout of the belt running test machine 100 in the misalignment abnormal noise durability test.

  The belt running test machine 100 includes an upper drive rib pulley 101 (pulley diameter 80 mm) provided on the upper and lower sides, a lower large-diameter driven rib pulley 102 (pulley diameter 130 mm), and an idler pulley provided between the upper and lower sides. 103 (pulley diameter 80 mm) and a small-diameter driven rib pulley 104 (pulley diameter 60 mm) arranged on the right side of the idler pulley 103. The V-ribbed belt B is wound around the belt running test machine 100 so that the V-rib is in contact with the drive rib pulley 101, the large-diameter driven rib pulley 102, and the small-diameter driven rib pulley 104 and the back side is in contact with the idler pulley 103.

  About each V-ribbed belt of Examples 1-12 and Comparative Examples 1-3, it sets to the said belt running test machine 100, and the large diameter rib pulley 102 is set so that the misalignment amount with the idler pulley 103 may be 3 degrees. Offset to the front to cause misalignment due to pulley displacement, rotate the drive rib pulley 101 counterclockwise at 750 rpm under an ambient temperature of 5 ° C., and listen clearly from a place 1 m away from the belt running test machine 100 The belt was run until enough noise was observed.

<6% forced slip wear test>
FIG. 11 shows the pulley layout of the belt running test machine 110 in the 6% forced slip wear test.

  The belt running test machine 110 has rib pulleys 111 and 112 (upper driven pulley and lower drive pulley, pulley diameter 80 mm) provided in the vertical direction, and a large diameter provided on the right side in the middle in the vertical direction. The rib pulley 113 is arranged so that the winding angle of the V-ribbed belt B in the large-diameter rib pulley 113 is 90 °. The V-ribbed belt B is wound around the belt running test machine 110 such that the V-rib contacts the driven rib pulley 111, the drive rib pulley 112, and the large-diameter rib pulley 113.

  For each of the V-ribbed belts of Examples 1 to 12 and Comparative Examples 1 to 3, after measuring the mass, it was wound around the belt running test machine 110 and applied to the large-diameter rib pulley 113 so as to be loaded with a shaft torque of 9.8 Nm. The dead weight is applied to the side, and 6% forced slip occurs, that is, the driven rib pulley 112 is driven so that the number of revolutions of the driven pulley is 2958 rpm, which is 6% less than that of 3135 rpm. The belt traveled by synchronizing the rib pulley shaft and the driven pulley shaft with a toothed belt. The belt was run for 100 hours to stop the rotation, and the mass of the V-ribbed belt was measured again.

  The wear rate was calculated by dividing the weight loss before and after running the belt by the mass before running the belt.

(Test evaluation results)
Tables 3-6 show the results of the test evaluation.

  Examples 1 to 12 in which the elongation in the length direction of the rib-side knit reinforcing cloth is 100 to 500% and the elongation in the width direction is 150 to 500%, and the rib-side knit reinforcing cloth in both the length and width directions. Compared with Comparative Example 1 in which the elongation is 550%, the latter has a significantly shorter time until the occurrence of abnormal noise in the misalignment abnormal noise endurance test, and the latter has a wear rate in the 6% forced slip wear test. You can see that it ’s big.

  Example 2 in which the number of stitches of the rib side knit reinforcing fabric is 64 × 39 and the elongation is 250% in both the belt direction and the belt width direction, and the number of stitches of the rib side knit reinforcing fabric is 40 × 25 and the elongation is Compared with Comparative Example 2 in which the belt direction and the belt width direction are 100%, the latter is such that the belt main body rubber oozes out from the rib side knit reinforcing cloth and the fibers of the rib side knit reinforcing cloth are almost buried in the rubber. It can be seen that abnormal noise occurs from the beginning of belt running.

  Comparative Example 2 in which the belt body rubber oozes out on the V-rib surface and Comparative Example 3 in which the V-rib surface is not covered with the rib-side knit reinforcing cloth and the belt body rubber is exposed are the misalignment abnormal noise durability test. Since an abnormal noise is generated from the initial stage of the travel, it can be seen that if the belt main body rubber is exposed on the entire surface of the V-rib, an abnormal noise during misalignment travel is caused.

  According to Examples 3 and 8 to 12 using various chemicals as the friction coefficient lowering agent, in the heat resistance running test, the misalignment abnormal noise durability test, and the 6% slip wear test, V It can be seen that a ribbed belt is obtained.

  As described above, the present invention is useful for the V-ribbed belt and the manufacturing method thereof.

B V-ribbed belt 10 Belt body 13 V-rib 14 Rib side knit reinforcing cloth 15 Rib surface rubber layer 20 Belt molding device 21 Rubber sleeve mold 22 Cylindrical outer mold

Claims (12)

A belt body having a plurality of V-ribs provided to extend in the belt length direction on the belt inner circumferential side, and a rib-side knit reinforcing cloth provided to cover the surface of the V-ribs of the belt body. V-ribbed belt provided,
The rib-side knitted reinforcing fabric has an elongation rate of 100 to 500% in the belt length direction and a stretch rate in the belt width direction of 150 to 500% when a load of 50 N is applied to a strip-shaped test piece having a width of 3 cm. Oh it is,
A rib surface rubber phase is provided between the part rib of the belt body and the rib side knit reinforcing cloth,
V-ribbed belt the rib surface rubber layer is characterized that you have exposed a pulley contact surface Heading immersion from the stitches of the rib side knit reinforcing fabric. The V-ribbed belt according to claim 1,
The V-ribbed belt is characterized in that the rib-side knitted reinforcing fabric is surface-coated with an RFL layer of a resorcin / formalin / latex aqueous solution containing a friction coefficient reducing agent. The V-ribbed belt according to claim 2,
The V-ribbed belt, wherein the friction coefficient reducing agent is polytetrafluoroethylene. In the V-ribbed belt according to claim 3,
A V-ribbed belt comprising 10 to 50 parts by mass of polytetrafluoroethylene as the friction coefficient reducing agent with respect to 100 parts by mass of the RFL solid content of the RFL layer. In the V-ribbed belt according to any one of claims 1 to 4 ,
The V-ribbed belt, wherein the rib surface rubber layer is formed of a rubber composition containing a friction coefficient reducing agent. In the V-ribbed belt according to any one of claims 1 to 5 ,
5 to 100 parts by mass of the friction coefficient reducing agent is blended with respect to 100 parts by mass of the raw rubber component. In the V-ribbed belt according to any one of claims 1 to 6 ,
The V-ribbed belt characterized in that the yarn constituting the rib-side knitted reinforcing fabric is a wooly processed yarn of polyamide fiber or polyester fiber. In the V-ribbed belt according to any one of claims 1 to 7 ,
A V-ribbed belt characterized in that a yarn constituting the rib-side knitted reinforcing fabric is a covering yarn having a polyurethane elastic yarn as a core yarn. The V-ribbed belt according to claim 8 ,
The V-ribbed belt, wherein the covering yarn is covered with a thread made of at least one of polyamide and ultrahigh molecular weight polyethylene. The V-ribbed belt according to claim 8 or 9 ,
The covering yarn is a double covered yarn,
The V-covered yarn is characterized in that the double-covered yarn is double-covered with a thread made of at least one of ultrahigh molecular weight polyethylene and polyamide. In the V-ribbed belt according to any one of claims 1 to 10 ,
A V-ribbed belt characterized in that at least a part of the belt body constituting the V-rib is formed of a rubber composition using an ethylene-α-olefin elastomer as a raw rubber. A method for producing a V-ribbed belt according to any one of claims 1 to 11 ,
Providing a belt material including an uncrosslinked rubber material for forming a belt body and a knit cloth serving as a rib-side knit reinforcing cloth on the outer periphery of a cylindrical rubber sleeve mold;
Inserting the rubber sleeve mold provided with the belt material into a cylindrical outer mold provided with a rib forming portion on the inner periphery;
By inflating the rubber sleeve mold inserted into the cylindrical outer mold, the belt material is brought into pressure contact with the cylindrical outer mold, and the uncrosslinked rubber composition contained in the belt material is crosslinked and integrated. Steps,
The manufacturing method of V-ribbed belt provided with.

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