WO2018043355A1 - Courroie à nervures en v et son utilisation - Google Patents

Courroie à nervures en v et son utilisation Download PDF

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Publication number
WO2018043355A1
WO2018043355A1 PCT/JP2017/030600 JP2017030600W WO2018043355A1 WO 2018043355 A1 WO2018043355 A1 WO 2018043355A1 JP 2017030600 W JP2017030600 W JP 2017030600W WO 2018043355 A1 WO2018043355 A1 WO 2018043355A1
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WO
WIPO (PCT)
Prior art keywords
pulley
rib
ribbed belt
belt
parts
Prior art date
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PCT/JP2017/030600
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English (en)
Japanese (ja)
Inventor
国広　康嗣
宏貴 今井
雄司 丸山
長谷川　新
日根野　順文
Original Assignee
三ツ星ベルト株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Priority claimed from JP2017159935A external-priority patent/JP6553687B2/ja
Application filed by 三ツ星ベルト株式会社 filed Critical 三ツ星ベルト株式会社
Priority to EP17846360.0A priority Critical patent/EP3505792B1/fr
Priority to US16/329,289 priority patent/US11668371B2/en
Priority to CN201780052510.5A priority patent/CN109642640B/zh
Publication of WO2018043355A1 publication Critical patent/WO2018043355A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
    • F16G5/00—V-belts, i.e. belts of tapered cross-section
    • F16G5/04—V-belts, i.e. belts of tapered cross-section made of rubber
    • F16G5/06—V-belts, i.e. belts of tapered cross-section made of rubber with reinforcement bonded by the rubber
    • F16G5/08—V-belts, i.e. belts of tapered cross-section made of rubber with reinforcement bonded by the rubber with textile reinforcement
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/04—Homopolymers or copolymers of ethene
    • C08L23/08—Copolymers of ethene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L71/00—Compositions of polyethers obtained by reactions forming an ether link in the main chain; Compositions of derivatives of such polymers
    • C08L71/02—Polyalkylene oxides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
    • F16G5/00—V-belts, i.e. belts of tapered cross-section
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
    • F16G5/00—V-belts, i.e. belts of tapered cross-section
    • F16G5/04—V-belts, i.e. belts of tapered cross-section made of rubber
    • F16G5/06—V-belts, i.e. belts of tapered cross-section made of rubber with reinforcement bonded by the rubber
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
    • F16G5/00—V-belts, i.e. belts of tapered cross-section
    • F16G5/20—V-belts, i.e. belts of tapered cross-section with a contact surface of special shape, e.g. toothed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/02—Gearings for conveying rotary motion by endless flexible members with belts; with V-belts

Definitions

  • the present invention relates to a V-ribbed belt used for driving an automotive engine accessory, and more specifically, improving the fuel efficiency while stabilizing the frictional state of a friction transmission surface and maintaining sound resistance (quietness).
  • the present invention relates to a V-ribbed belt that can be reduced and its use.
  • An auxiliary machine such as an alternator, a water pump, and a power steering pump is attached to an internal combustion engine (engine) such as an automobile, and these auxiliary machines are connected via a power transmission mechanism in which a transmission belt is suspended by an engine crankshaft. It is generally mechanically driven.
  • V-ribbed belt is used as a transmission belt used in an engine accessory drive system, and means for reducing torcross is proposed for the V-ribbed belt.
  • Patent Document 1 proposes a V-ribbed belt in which the torque loss is reduced by reducing internal loss (self-heating) using a rubber composition having a small loss tangent tan ⁇ . .
  • Patent Document 2 proposes the torcross by arranging the position of the core wire on the inner peripheral side to reduce the bending stress (belt bending loss) of the core wire. V-ribbed belts have been proposed.
  • V-ribbed belts can achieve a certain degree of torque reduction, in a portion where the pulley diameter is small, such as an alternator that is a power generation device, the amount of bending of the wound belt is large, and the torque loss is not reduced. It is enough. Since the part where such a large torque cross is generated greatly affects the friction loss of the engine, further reduction of the torque cross is a major issue.
  • Stick-slip phenomenon refers to self-excited vibration caused by microscopic adhesion between friction surfaces and repeated sliding, and the friction coefficient decreases with increasing sliding speed, or from static friction. This is a phenomenon that occurs when discontinuous friction drop occurs when moving to dynamic friction. Even in the case of a V-ribbed belt, if the friction coefficient of the transmission surface that is in friction with the pulley is high (particularly high in adhesiveness), sticking and sticking (slip) are repeated between the friction between the belt and the pulley. A slip phenomenon (vibration) occurs, and abnormal noise (squealing noise) occurs at the stage of transition from adhesion to slipping. In view of this, a means has been proposed in which an additive (soundproofing improver) for improving sound resistance is blended to reduce the friction coefficient of the friction transmission surface and suppress the generation of abnormal noise.
  • an additive soundproofing improver
  • Patent Document 3 uses ultra high molecular weight polyethylene powder
  • Patent Document 4 uses a flat inorganic powder, and friction transmission surface. There has been proposed a method for reducing the coefficient of friction by blending with the compressed rubber layer constituting the material.
  • the ultrahigh molecular weight polyethylene powder and the inorganic powder are compounding agents that increase the internal loss (tan ⁇ ), and have the disadvantage that the torque loss becomes large.
  • stick-slip noise that occurs during running under water is also a problem. Specifically, if the wettability of the friction transmission surface is low and the water ingress state between the belt and pulley (between the belt and the pulley) is not uniform, the friction coefficient is high at locations where water has not entered (dry state). On the other hand, at the place where water has infiltrated (water-impregnated state), the friction coefficient is partly lowered, so that the friction state becomes unstable and a stick-slip sound is generated.
  • a means has been proposed in which a soundproofing improver is blended to improve the affinity of the friction transmission surface for water to suppress the generation of abnormal noise.
  • a friction transmission surface is formed with a rubber composition in which 1 to 25 parts by mass of a surfactant is blended with 100 parts by mass of an ethylene / ⁇ -olefin elastomer.
  • a friction transmission belt is disclosed.
  • the Japanese Patent 2007-232205 Patent Document 6
  • the ethylene ⁇ alpha-olefin elastomer 100 parts by weight
  • a friction transmission belt in which a friction transmission surface is formed with a rubber composition containing 10 to 25 parts by weight of the plasticizer 2 is disclosed.
  • the affinity between the rubber (ethylene- ⁇ -olefin elastomer) that forms the friction transmission surface and water is increased by blending surfactants and plasticizers, so that noise caused by stick-slip is reduced. Decrease and improve sound resistance when wet.
  • Patent Document 7 discloses a V-belt between a driving V pulley and a driven V pulley as a power transmission V-belt device that can prevent jerky oscillation and noise at the start. in hung and comprising transmission, the V-belt angle theta 1 a power transmission V-belt apparatus having an increased 5 ⁇ 15 ° than the groove angle theta 2 of the V-pulley is disclosed.
  • the V belt include a wrapped belt, a low edge belt, a low edge cogged belt, and a rib star belt.
  • Patent Document 8 As a V-ribbed belt in which sound and noise during belt running are reduced, para-aramid fibers are fibrillated and protruded on the rib surface, and the rib portion A V-ribbed belt is disclosed in which the rib angle, which is the V-shaped angle, is 42 to 50 °.
  • the rib angle is 2 to 10 ° larger than the angle of the V-shaped groove portion of the pulley. In the embodiment, the rib angle is 2.5 ° or 4.5 ° larger.
  • chloroprene rubber, hydrogenated nitrile rubber, natural rubber, CSM, and SBR are exemplified as the rubber of the belt material, and chloroprene rubber is used in the examples.
  • Patent Document 9 discloses that the heat resistance life of the belt is improved without substantially reducing the transmission performance, and the core wires exposed at both end portions of the belt are short during operation.
  • a V-ribbed belt that does not peel off over time a V-ribbed belt in which the rib angle is set to 10 ⁇ 2.5 ° higher than the groove angle with respect to a V-ribbed pulley having a groove angle of 36 to 50 °, or a groove angle of 36 to 45
  • the rib angle is set to 15 ⁇ 2.5 ° or 5 ⁇ 2.5 ° higher than the groove angle with respect to the V-ribbed pulley at 0 °, both end portions of the belt are deleted or exposed at both end portions.
  • a V-ribbed belt with the core wire removed is disclosed.
  • Patent Documents 7 to 9 describe that the belt angle and the rib angle are made larger than the groove angle of the pulley, but there is no description about the small-diameter pulley and the torque cross (fuel saving performance), No soundproofing improver is included. Patent Document 7 does not describe the material of the belt, and Patent Document 9 does not describe details of the rib rubber.
  • Japanese Unexamined Patent Publication No. 2010-276127 (Claim 1, paragraph [0008]) Japanese Unexamined Patent Publication No. 2013-177967 (Claim 1, paragraphs [0001] [0012]) Japanese Unexamined Patent Publication No. 2007-70592 (Claim 1, paragraph [0010]) Japanese Unexamined Patent Publication No. 2009-168243 (Claim 1, paragraph [0015]) Japanese Patent Laid-Open No. 2008-185162 (Claim 1) Japanese Unexamined Patent Publication No. 2007-232205 (Claim 1) Japanese Utility Model Publication No. 63-147951 (claims for utility model registration, page 4, lines 2 to 3, page 5, lines 2 to 7) Japanese Patent Laid-Open No. 8-184347 (Claims 1 and 8, paragraphs [0001] [0014], Examples) Japanese Unexamined Patent Publication No. 2000-74154 (Claims, paragraph [0020])
  • An object of the present invention is to provide a V-ribbed belt that can achieve both soundproofing and fuel saving, a belt transmission device including the V-ribbed belt, and a method for reducing torcross of the belt transmission device using the V-ribbed belt. is there.
  • Another object of the present invention is to provide a V-ribbed belt that can reduce torcross while maintaining sound resistance against stick-slip noise and adhesive wear sound even when a sound resistance improver is blended with rubber forming a friction transmission surface.
  • Another object of the present invention is to provide a belt transmission device provided with the V-ribbed belt and a method for reducing the torque cross of the belt transmission device using the V-ribbed belt.
  • Still another object of the present invention is to provide a V-ribbed belt capable of reducing the torque cross even in a small-diameter pulley such as an alternator that is a power generation device, a belt transmission device provided with the V-ribbed belt, and a torcross of the belt transmission device using the V-ribbed belt. It is to provide a method of reducing.
  • the present inventors have determined that the V-rib angle of the V-rib portion of the V-ribbed belt provided with the compression rubber layer containing the soundproofing improver is set to 5 than the V-rib groove angle of the pulley. It has been found that by increasing the angle by 9 °, it is possible to achieve both sound resistance and fuel saving, and the present invention has been completed.
  • the V-ribbed belt of the present invention has a plurality of V-rib portions extending in parallel with each other along the longitudinal direction of the belt, and at least a part of which is a compressed rubber having a friction transmission surface capable of contacting the V-rib groove portion of the pulley.
  • a V-ribbed belt provided with a layer, wherein the friction transmission surface of the compressed rubber layer is formed of a vulcanized product of a rubber composition containing a rubber component and a soundproofing improver, and a V-rib angle of the V-rib portion Is 5 to 9 ° larger than the V-rib groove angle of the pulley.
  • the V rib angle of the V rib portion is about 41 to 45 °.
  • the pulley may include a pulley having an outer diameter of 65 mm or less.
  • the soundproofing improver is at least one selected from the group consisting of a surfactant, a plasticizer having a solubility index greater than that of a rubber component, inorganic particles, and polyethylene resin particles (in particular, a polyethylene glycol type nonionic interface). Activator and / or ether ester plasticizer).
  • the ratio of the polyethylene glycol type nonionic surfactant is about 2 to 20 parts by mass with respect to 100 parts by mass of the rubber component.
  • the ratio of the ether ester plasticizer is about 5 to 15 parts by mass with respect to 100 parts by mass of the rubber component.
  • the rubber component may contain an ethylene- ⁇ -olefin elastomer.
  • the present invention includes the V-ribbed belt and a pulley having a V-rib groove portion that can be fitted to the V-rib portion of the V-ribbed belt, and the V-rib angle of the V-rib portion of the V-ribbed belt is such that the V-rib angle of the pulley. Also included are belt transmissions that are 5-9 degrees larger than the rib groove angle.
  • the pulley may include a pulley having an outer diameter of 65 mm or less.
  • the present invention also includes a method of reducing the torque cross of the belt transmission device by hanging the V-ribbed belt on a pulley including a pulley having an outer diameter of 65 mm or less.
  • the V-rib angle of the V-rib portion of the V-ribbed belt having the compression rubber layer containing the sound-proofing improver is 5 to 9 ° larger than the V-rib groove angle of the pulley. And both. Specifically, even when a soundproofing improver, which is a foreign substance, is blended with the rubber forming the friction transmission surface, the torque loss can be reduced while maintaining the soundproofness against stick-slip noise and adhesive wear sound. In particular, even in a small-diameter pulley such as an alternator that is a power generator, torque cross can be reduced.
  • FIG. 1 is a schematic cross-sectional view showing an example of a V-ribbed belt of the present invention.
  • FIG. 2 is a schematic perspective view for explaining the V-rib angle ⁇ of the V-rib portion of the V-ribbed belt of the present invention.
  • FIG. 3 is a schematic cross-sectional view for explaining the V-rib groove angle ⁇ of the pulley.
  • FIG. 4 is a schematic cross-sectional view for explaining a state in which the V-rib portion of the V-ribbed belt of the present invention is fitted in the V-rib groove portion of the pulley.
  • FIG. 5 is a schematic diagram for explaining the dimensions of the V-ribbed belt used in the examples.
  • FIG. 1 is a schematic cross-sectional view showing an example of a V-ribbed belt of the present invention.
  • FIG. 2 is a schematic perspective view for explaining the V-rib angle ⁇ of the V-rib portion of the V-ribbed belt of the present invention.
  • FIG. 3 is a schematic cross-section
  • FIG. 6 is a schematic diagram for explaining a method of measuring the friction loss of the V-ribbed belt in the example.
  • FIG. 7 is a schematic diagram for explaining the sound resistance test (sound measurement in an actual vehicle) of the V-ribbed belt in the example.
  • FIG. 8 is a schematic diagram for explaining a sound resistance test (misalignment sound measurement) of the V-ribbed belt in the example.
  • FIG. 9 is a schematic view for explaining an adhesive wear test of the rib bottom portion of the V-ribbed belt in the example.
  • FIG. 10 is a graph showing a simulation result of torcross by FEM analysis of Example 4 and Comparative Example 9.
  • FIG. 1 is a schematic sectional view showing an example of the V-ribbed belt of the present invention.
  • a V-ribbed belt shown in FIG. 1 includes a compression rubber layer 2, an adhesive layer 4 in which a core body 1 is embedded in the belt longitudinal direction, a cover canvas (woven fabric) in order from the belt lower surface (inner circumferential surface) to the belt upper surface (back surface).
  • a knitted fabric, a non-woven fabric, etc. A plurality of V-shaped grooves extending in the longitudinal direction of the belt are formed in the compressed rubber layer 2, and a plurality of V-rib portions 3 having a V-shaped cross section (reverse trapezoid) are formed between the grooves (example shown in FIG. 1). 4), and the two inclined surfaces (surfaces) of the V-rib portion 3 form a friction transmission surface and contact the pulley to transmit power (friction transmission).
  • the V-ribbed belt of the present invention is not limited to this form, and it is sufficient that at least a part is provided with a compression rubber layer having a transmission surface that can come into contact with the V-rib groove portion (V-groove portion) of the pulley. What is necessary is just to provide the core body embed
  • the stretch layer 5 may be formed of a rubber composition, or the core body 1 may be embedded between the stretch layer 5 and the compressed rubber layer 2 without providing the adhesive layer 4. Good.
  • the adhesive layer 4 is provided on either the compressed rubber layer 2 or the stretched layer 5, and the core 1 is disposed between the adhesive layer 4 (compressed rubber layer 2 side) and the stretched layer 5, or the adhesive layer 4 (stretched layer). 5 side) and the compressed rubber layer 2 may be embedded.
  • the compressed rubber layer is formed of the rubber composition described in detail below, and the stretch layer and the adhesive layer are formed of a conventional rubber composition used as the stretch layer and the adhesive layer. As long as it is formed, it may not be formed of the same rubber composition as the compressed rubber layer. Note that the rubber composition forming the stretch layer and the adhesive layer does not need to contain a soundproofing improver.
  • the V-rib angle ⁇ of the V-ribbed belt shown in FIG. 2 is larger (wide angle) than the V-rib groove angle ⁇ of the pulley shown in FIG. 3, and the angle difference ( ⁇ ) is 5 to 9 °.
  • the friction loss can be achieved without deteriorating other characteristics such as soundproofing (silence). ) Can be reduced, but the reason can be estimated as follows.
  • the angle difference between the V rib angle ⁇ and the V rib groove angle ⁇ may be 5 to 9 °, preferably 5.5 to 8.5 °, more preferably 6 to 8 ° (especially 6.5 to 7). .5 °). If the angle difference is too small, the torque cross is not reduced, and if it is too large, adhesive wear on the bottom of the V-rib portion (abnormal noise due to adhesive wear) occurs, resulting in poor sound resistance.
  • the V rib angle ⁇ of the V rib portion is, for example, about 35 to 50 °, preferably about 40 to 47 °, and more preferably about 41 to 45 °.
  • the V-ribbed belt of the present invention having such a V-rib angle is particularly effective for a small-diameter pulley having a small diameter and a large bending amount of the wound belt. This is because the torque cross becomes the largest with a small-diameter pulley having the highest surface pressure against the pulley, and the torque cross with the small-diameter pulley greatly affects the friction loss of the engine.
  • the V-ribbed belt of the present invention is preferably hung on a pulley including a small-diameter pulley, and the outer diameter of such a small-diameter pulley may be 65 mm or less, for example, 10 to 65 mm, preferably 30 to 60 mm, More preferably, it may be about 40 to 55 mm.
  • the core is not particularly limited, but normally, cores (twisted cords) arranged at a predetermined interval in the belt width direction can be used.
  • core wire high-modulus fibers, for example, the above-mentioned polyester fibers (polyalkylene arylate fibers), synthetic fibers such as aramid fibers, inorganic fibers such as carbon fibers, etc. are widely used, and polyester fibers (polyethylene terephthalate fibers, polyethylene naphthalates). Phthalate fibers) and aramid fibers are preferred.
  • the fiber may be a multifilament yarn, for example, a multifilament yarn having a fineness of 2000 to 10000 denier (particularly 4000 to 8000 denier).
  • the core wire usually a twisted cord using multifilament yarn (for example, various twists, single twists, rung twists, etc.) can be used.
  • the average wire diameter (fiber diameter of the twisted cord) of the core wire may be, for example, about 0.5 to 3 mm, preferably about 0.6 to 2 mm, and more preferably about 0.7 to 1.5 mm.
  • the core wire may be embedded in the longitudinal direction of the belt, and one or a plurality of core wires may be embedded in parallel at a predetermined pitch parallel to the longitudinal direction of the belt.
  • the core wire is subjected to various adhesion treatments with a resorcin-formalin-latex (RFL) liquid, an epoxy compound, an isocyanate compound, etc., and then between the stretched layer and the compressed rubber layer. (Especially, it may be embedded in the adhesive layer).
  • RTL resorcin-formalin-latex
  • the stretch layer may have a reinforcing cloth, for example, a cloth material (preferably a woven cloth) such as a woven cloth, a wide angle sail cloth, a knitted cloth or a non-woven cloth. If necessary, the reinforcing cloth may be laminated on the surface of the stretched layer by performing the adhesion treatment.
  • a cloth material preferably a woven cloth
  • the reinforcing cloth may be laminated on the surface of the stretched layer by performing the adhesion treatment.
  • the V-ribbed belt of the present invention includes a compressed rubber layer having a transmission surface at least a part of which can contact with the V-rib groove portion of the pulley.
  • the compression rubber layer has a friction transmission surface with a rubber component and a soundproofing improver.
  • a surface layer portion formed of the rubber composition is formed on the friction transmission surface, and the other portion (inner layer portion) does not contain a soundproofing improver.
  • it may be a compressed rubber layer, the entire compressed rubber layer is formed of a rubber composition containing a soundproofing improver in terms of soundproofing (particularly soundproofing over a long period of time) and productivity.
  • a compressed rubber layer is preferred.
  • Rubber component examples include known rubber components and / or elastomers such as diene rubber [natural rubber, isoprene rubber, butadiene rubber, chloroprene rubber, styrene butadiene rubber (SBR), acrylonitrile butadiene rubber (nitrile rubber), hydrogenated nitrile. Rubber (including mixed polymers of hydrogenated nitrile rubber and unsaturated carboxylic acid metal salt), etc.], ethylene- ⁇ -olefin elastomer, chlorosulfonated polyethylene rubber, alkylated chlorosulfonated polyethylene rubber, epichlorohydrin rubber, acrylic rubber Examples thereof include silicone rubber, urethane rubber, and fluorine rubber.
  • diene rubber natural rubber, isoprene rubber, butadiene rubber, chloroprene rubber, styrene butadiene rubber (SBR), acrylonitrile butadiene rubber (nitrile rubber), hydrogenated nitrile. Rubber (including mixed polymers
  • ethylene- ⁇ -olefin elastomers ethylene-propylene rubber (EPR), ethylene-propylene rubber (EPR), free from harmful halogens, ozone-resistant, heat-resistant, cold-resistant, and economically superior
  • Ethylene- ⁇ -olefin rubbers such as ethylene-propylene-diene copolymers (EPDM, etc.) are preferred.
  • the friction transmission surface of the compression rubber layer contains a soundproofing improver, the friction state between the belt and the pulley can be stabilized, and not only the soundproofing performance can be improved, but also the compression rubber layer improves the soundproofing performance.
  • the torcross can be reduced because the V-rib portion is formed at a predetermined angle.
  • the proportion of the soundproofing improver can be selected from the range of about 1 to 100 parts by weight with respect to 100 parts by weight of the rubber component depending on the type of the soundproofing improver. 35 parts by mass). If the proportion of the sound-proofing improver is too small, the sound-proofing property may be lowered, and conversely if too large, the torque loss may be increased.
  • a conventional soundproofing improver for stabilizing the friction state between the belt and the pulley can be used.
  • surfactants and plasticizers are used because they are excellent in soundproofing improvement effect.
  • Inorganic particles and polyethylene resin particles are preferred.
  • the surfactant may be either an ionic surfactant or a nonionic surfactant, and can be selected according to the type of rubber component.
  • the rubber component is an ethylene- ⁇ -olefin elastomer.
  • a nonionic surfactant is preferable from the viewpoint of improving sound resistance, and a polyethylene glycol type nonionic surfactant and a polyhydric alcohol type nonionic surfactant are particularly preferable.
  • Polyethylene glycol type nonionic surfactant is a hydrophilic group formed by adding ethylene oxide to a hydrophobic base component having a hydrophobic group such as higher alcohol, alkylphenol, higher fatty acid, higher polyhydric alcohol higher fatty acid ester, higher fatty acid amide, or polypropylene glycol. Is a nonionic surfactant.
  • Examples of the higher alcohol as the hydrophobic base component include C 10-30 saturated alcohols such as lauryl alcohol, tetradecyl alcohol, cetyl alcohol, octadecyl alcohol, aralkyl alcohol, and C 10-26 unsaturated alcohols such as oleyl alcohol. It can be illustrated.
  • Examples of the alkylphenol include C 4-16 alkylphenol such as octylphenol and nonylphenol. These higher alcohols may be used alone or in combination of two or more.
  • Higher fatty acids of the hydrophobic base component include saturated fatty acids [eg C 10-30 saturated fatty acids such as myristic acid, palmitic acid, stearic acid, arachidic acid, behenic acid, lignoceric acid, serotic acid, montanic acid, preferably C 12-28 saturated fatty acids, more preferably C 14-26 saturated fatty acids, particularly preferably C 16-22 saturated fatty acids and the like; oxycarboxylic acids such as hydroxystearic acid], unsaturated fatty acids [eg oleic acid, erucic acid, erucic acid, linoleic acid, linolenic acid, unsaturated C 10-30 fatty acids such as eleostearic acid], and others. These higher fatty acids may be used alone or in combination of two or more.
  • saturated fatty acids eg C 10-30 saturated fatty acids such as myristic acid, palmitic acid, stearic acid, arachidic acid, behenic acid, lignoceric acid
  • the polyhydric alcohol higher fatty acid ester is an ester of a polyhydric alcohol and the higher fatty acid and has an unreacted hydroxyl group.
  • polyhydric alcohols include alkanediols (such as C 2-10 alkanediols such as ethylene glycol, propylene glycol, and butanediol), alkanetriols (such as glycerin, trimethylolethane, trimethylolpropane), and alkanetetraols (pentaerythritol, Examples thereof include diglycerin and the like, alkanehexaol (such as dipentaerythritol, sorbitol, and sorbit), alkaneoctaol (such as sucrose), and alkylene oxide adducts thereof (such as C 2-4 alkylene oxide adducts). These higher fatty acid esters may be used alone or in combination of two or more.
  • oxyethylene ethylene oxide or “ethylene glycol”
  • EO ethylene oxide
  • PO ethylene glycol
  • poly EO higher alcohol ethers poly EO 10-26 alkyl ethers such as poly EO lauryl ether and poly EO stearyl ether
  • C 10-26 such as poly EO poly PO alkyl ether
  • alkylphenol-EO adducts such as polyEO octylphenyl ether and polyEO nonylphenyl ether
  • fatty acid such as polyEO monolaurate, polyEO monooleate and polyEO monostearate Body
  • glycerol mono- or di-higher fatty acid esters -EO adduct glycerin mono- or dilaurate, glycerin mono- or dipalmitate, glyceryl mono- or distearate, EO adducts of glycerin mono- or di-C 10-26 fatty acid esters such as glycerol mono- or dioleate
  • Pentaerythritol higher fatty acid ester-EO adduct pentaerythritol mono to tri C 10-26 fatty acid ester-EO adduct such as pentaerythritol distearate-EO adduct
  • the polyhydric alcohol type nonionic surfactant is a nonionic surfactant in which a hydrophobic group such as a higher fatty acid is bonded to the polyhydric alcohol (especially alkanetriol or alkanehexaol such as glycerol, pentaerythritol, sucrose or sorbitol). It is an agent.
  • polyhydric alcohol type nonionic surfactant examples include glycerin fatty acid esters such as glycerin monostearate and glycerin monooleate, pentaerythritol fatty acid esters such as pentaerythritol monostearate and pentaerythritol beef tallow fatty acid ester, Sorbitan fatty acid esters such as sorbitan monolaurate, sorbitan monostearate, sorbitol fatty acid esters such as sorbitol monostearate, sucrose fatty acid esters, alkyl ethers of polyhydric alcohols, fatty acid amides of alkanolamines such as coconut fatty acid diethanolamide, Examples thereof include alkyl polyglycosides. These polyhydric alcohol type nonionic surfactants can also be used alone or in combination of two or more, and may be used in combination with the polyethylene glycol type nonionic surfactant.
  • Preferred surfactants are nonionic surfactants, particularly polyethylene glycol type nonionic surfactants (eg, poly EOC 10-26 alkyl ether, alkylphenol-EO adducts, polyhydric alcohol C 10-26 fatty acid ester-EO Adducts, etc.).
  • polyethylene glycol type nonionic surfactants eg, poly EOC 10-26 alkyl ether, alkylphenol-EO adducts, polyhydric alcohol C 10-26 fatty acid ester-EO Adducts, etc.
  • the HLB (Hydrophile-Lipophile-Balance) value of the surfactant is, for example, 8.7 to 17, preferably 9 to 15, and more preferably 9.5 to 14 ( In particular, it is about 10 to 13.5).
  • the HLB value is a value calculated by the Griffin method.
  • the viscosity (25 ° C.) of the surfactant is, for example, about 10 to 300 MPa ⁇ s, preferably about 20 to 200 MPa ⁇ s.
  • the ratio of the surfactant is, for example, 1 to 25 parts by mass, preferably 2 to 20 parts by mass, and more preferably 3 to 15 parts by mass with respect to 100 parts by mass of the rubber component. Part (particularly 4 to 10 parts by mass). If the proportion of the surfactant is too small, the sound resistance may be lowered, and if too much, the torque loss may be increased.
  • the plasticizer may be any plasticizer having a solubility index (Solubility Parameters: SP value) larger than that of the rubber component. For example, 8.3 to 10.7 ( cal / cm 3 ) 1/2 , preferably 8.4 to 10.5 (cal / cm 3 ) 1/2 , more preferably 8.5 to 10 (cal / cm 3 ) 1/2
  • the plasticizer which has is preferable.
  • the solubility index is particularly effective when the rubber component is an ethylene- ⁇ -olefin elastomer.
  • plasticizer a conventional plasticizer having such a solubility index can be used.
  • conventional plasticizers include aliphatic carboxylic acid plasticizers (adipic acid ester plasticizers, sebacic acid ester plasticizers, etc.), aromatic carboxylic acid ester plasticizers (phthalic acid ester plasticizers, Merit acid ester plasticizers), oxycarboxylic acid ester plasticizers, phosphate ester plasticizers, ether plasticizers, ether ester plasticizers, and the like. These plasticizers can be used alone or in combination of two or more. Of these plasticizers, when the rubber component is an ethylene- ⁇ -olefin elastomer, ether ester plasticizers are preferred because they have a large effect of improving sound resistance.
  • ether ester plasticizers include poly C 2 such as poly EO dibutanoate, poly EO diisobutanoate, poly EO di-2-ethylbutyrate, poly EO di-2-ethylhexylate, poly EO didecanoate, and the like.
  • ether ester plasticizers can be used alone or in combination of two or more.
  • poly C 2-4 alkylene glycol di C 4-12 fatty acid esters such as poly EO di-2-ethylhexylate are preferred.
  • the weight average molecular weight of the plasticizer is, for example, 300 to 2000, preferably 350 to 1500 (eg 370 to 1000), more preferably 400 in terms of polystyrene in gel permeation chromatography (GPC). About 800 (especially 450 to 600).
  • the proportion of the plasticizer is, for example, 3 to 20 parts by mass (eg 5 to 15 parts by mass), preferably 3.5 to 15 parts by mass, more preferably 100 parts by mass of the rubber component. Is about 4 to 10 parts by mass (especially 4.5 to 8 parts by mass). If the proportion of the plasticizer is too small, the sound resistance may be lowered. Conversely, if the proportion is too large, the torque loss may be increased.
  • inorganic particles can be used as the inorganic particles (inorganic filler or inorganic powder).
  • Conventional inorganic particles include, for example, graphite, metal oxide (calcium oxide, barium oxide, iron oxide, copper oxide, titanium oxide, aluminum oxide, etc.), metal carbonate (magnesium carbonate, calcium carbonate, etc.), metal silicate Salt (such as calcium silicate and aluminum silicate), metal carbide (such as silicon carbide and tungsten carbide), metal nitride (such as titanium nitride, aluminum nitride, boron nitride), metal sulfide (such as molybdenum disulfide), metal sulfate Salt (calcium sulfate, barium sulfate, etc.), clay (hydrous aluminum silicate: clay composed of clay minerals such as pyrophyllite, kaolinite, sericite, montmorillonite, bentonite, smectite), talc (
  • the shape of the inorganic particles is not particularly limited, and for example, a spherical shape, an elliptical shape, a polygonal shape (polygonal pyramid shape, a rectangular parallelepiped shape, a rectangular parallelepiped shape, etc.), a flat shape (plate shape, scale shape, etc.), a rod shape, a fiber shape And indefinite shape.
  • a spherical shape an elliptical shape
  • a polygonal shape polygonal pyramid shape, a rectangular parallelepiped shape, a rectangular parallelepiped shape, etc.
  • a flat shape plate shape, scale shape, etc.
  • rod shape a fiber shape And indefinite shape
  • flat shapes, indefinite shapes, etc. are widely used.
  • the average particle size (number average primary particle size) of the inorganic particles is, for example, about 0.1 to 100 ⁇ m, preferably about 1 to 50 ⁇ m, and more preferably about 1 to 30 ⁇ m. If the size of the inorganic particles is too small, the sound resistance may not be improved sufficiently, and conversely if too large, the mechanical properties of the belt may be deteriorated.
  • the average particle diameter and the aspect ratio can be measured by a method of measuring dimensions based on a scanning electron micrograph taken at 50 times, a laser diffraction scattering method, or the like.
  • the inorganic particles may be either non-porous or porous, but the nitrogen adsorption specific surface area by the BET method is, for example, about 5000 to 30000 cm 2 / g, preferably about 6000 to 25000 cm 2 / g. If the specific surface area is too small, the particles become large and the mechanical properties of the belt may be reduced. Conversely, if the surface area is too large, the particles become small and the sound resistance may not be sufficiently improved.
  • the apparent density of the inorganic particles is, for example, about 0.2 to 0.7 g / ml, preferably about 0.25 to 0.65 g / ml.
  • the oil absorption of the inorganic particles is about 10 to 40 ml / 100 g, preferably about 20 to 38 ml / 100 g.
  • the proportion of the inorganic particles is, for example, 10 to 50 parts by weight, preferably 15 to 45 parts by weight (eg 15 to 35 parts by weight), more preferably 20 to 40 parts by weight (particularly 30 to 100 parts by weight) with respect to 100 parts by weight of the rubber component. 35 parts by mass). If the proportion of the inorganic particles is too small, the sound resistance may be reduced. Conversely, if the proportion is too large, the torque loss may be increased.
  • the polyethylene resin constituting the polyethylene resin particles may be a polyethylene homopolymer (homopolymer) or a polyethylene copolymer (copolymer).
  • the copolymerizable monomer contained in the copolymer include olefins (for example, ⁇ such as propylene, 1-butene, 1-pentene, 1-hexene, 3-methylpentene, 4-methylpentene, and 1-octene).
  • (meth) acrylic monomers for example, (meth) acrylic acid C 1-6 alkyl esters such as methyl (meth) acrylate and ethyl (meth) acrylate
  • acrylic monomers for example, (meth) acrylic acid C 1-6 alkyl esters such as methyl (meth) acrylate and ethyl (meth) acrylate
  • saturated carboxylic acids for example, maleic anhydride
  • vinyl esters for example, vinyl acetate, vinyl propionate, etc.
  • dienes for example, butadiene, isoprene, etc.
  • copolymerizable monomers ⁇ -C 3-8 olefins such as propylene, 1-butene, 1-hexene, 4-methylpentene and 1-octene are preferred.
  • the proportion of the copolymerizable monomer is 30 mol% or less (for example, 0.01 to 30 mol%), preferably 20 mol% or less (for example, 0.1 to 20 mol%), more preferably 10 mol% or less (for example, 1 to 10 mol%).
  • the copolymer may be a random copolymer, a block copolymer, or the like.
  • polyethylene resin examples include low, medium or high density polyethylene, linear low density polyethylene, ultrahigh molecular weight polyethylene, ethylene-propylene copolymer, ethylene-butene-1 copolymer, ethylene-propylene-butene- 1 copolymer, ethylene- (4-methylpentene-1) copolymer and the like. These polyethylenes can be used alone or in combination of two or more. Among these polyethylenes, polyethylenes such as medium- or high-density polyethylene and ultrahigh molecular weight polyethylene are preferable because they have a large effect of improving sound resistance.
  • the viscosity-average molecular weight of the polyethylene resin can be selected from a range of, for example, 10,000 or more, and is, for example, 100,000 to 9 million, preferably 150,000 to 5 million, and more preferably about 200,000 to 3 million. If the molecular weight is too small, the effect of improving sound resistance is not sufficient. In the present specification and claims, the viscosity average molecular weight can be measured according to ASTM D4020.
  • the density of the polyethylene-based resin can be selected from a range of about 0.9 to 0.97 g / cm 3 by a method in accordance with ASTM D792, and is, for example, 0.92 to 0.97 g from the viewpoint of a great effect of improving sound resistance.
  • / Cm 3 preferably 0.93 to 0.97 g / cm 3 , and more preferably about 0.94 to 0.97 g / cm 3 .
  • the melting point (or softening point) of the polyethylene resin is preferably not less than the processing temperature for kneading or rolling the rubber composition and not more than the vulcanization temperature, for example, 160 ° C.
  • the following for example, 120 to 160 ° C., preferably 125 to 150 ° C., more preferably about 125 to 140 ° C.
  • Examples of the shape of the polyethylene resin particles include the shapes exemplified in the section of the inorganic particles. Of the above-mentioned shapes, as the shape of the polyethylene resin particles, particles such as a spherical shape, an ellipsoidal shape, a polygonal shape, and an indefinite shape are generally used.
  • the average particle size (primary particle size) of the polyethylene resin particles is, for example, about 10 to 200 ⁇ m, preferably about 20 to 150 ⁇ m, and more preferably about 25 to 120 ⁇ m. If the particle diameter of the polyethylene resin particles is too small, the sound resistance may not be sufficiently improved, and conversely if too large, the mechanical properties of the belt may be deteriorated.
  • the ratio of the polyethylene resin particles is, for example, 1 to 30 parts by mass (for example, 5 to 20 parts by mass), preferably 3 to 20 parts by mass, more preferably 4 to 10 parts by mass (particularly with respect to 100 parts by mass of the rubber component. 4.5 to 8 parts by mass). If the proportion of the polyethylene resin particles is too small, the sound resistance may be lowered. Conversely, if the proportion is too large, the torque loss may be increased.
  • the rubber composition forming the compressed rubber layer may further contain a reinforcing agent in addition to the rubber component and the soundproofing improver.
  • the reinforcing agent includes reinforcing fibers and carbon black as a reinforcing agent.
  • reinforcing fibers examples include polyolefin fibers (polyethylene fibers, polypropylene fibers, etc.), polyamide fibers (polyamide 6 fibers, polyamide 66 fibers, polyamide 46 fibers, aramid fibers, etc.), polyester fibers (polyethylene terephthalate (PET) fibers, polyethylene).
  • C 2-4 alkylene C 6-14 arylate fiber such as naphthalate (PEN) fiber]
  • synthetic fiber such as vinylon fiber, polyparaphenylenebenzobisoxazole (PBO) fiber
  • natural fiber such as cotton, hemp, wool
  • An inorganic fiber such as carbon fiber can be exemplified. These fibers can be used alone or in combination of two or more.
  • reinforcing fibers at least one selected from polyamide fibers such as polyamide 66 fibers and aramid fibers, polyester fibers, and vinylon fibers is preferable.
  • the reinforcing fiber may be fibrillated. Further, various adhesive treatments may be applied to the reinforcing fiber in the same manner as the core wire.
  • the reinforcing fibers may be usually contained in the compressed rubber layer in the form of short fibers, and the average length of the short fibers is, for example, 0.1 to 20 mm, preferably 0.5 to 15 mm (for example, 1 to 10 mm), More preferably, it may be about 1 to 5 mm (especially 2 to 4 mm).
  • the average fiber diameter of the reinforcing fibers is, for example, about 1 to 100 ⁇ m, preferably 3 to 50 ⁇ m, more preferably 5 to 40 ⁇ m (particularly 10 to 30 ⁇ m).
  • Carbon black has a large particle size, particularly a large particle size carbon black having an iodine adsorption amount of 40 mg / g or less in order to improve fuel economy by reducing internal heat generation of the rubber composition forming the compressed rubber layer. Is preferably included.
  • the large particle size carbon black include FEF, GPF, APF, SRF-LM and SRF-HM. These carbon blacks can be used alone or in combination of two or more.
  • the number average primary particle size of the large particle size carbon black may be, for example, about 40 to 200 nm, preferably 45 to 150 nm, and more preferably about 50 to 125 nm.
  • the large particle size carbon black has a low reinforcing effect, it is preferable to use a small particle size carbon black having a small particle size and a high reinforcing effect (iodine adsorption amount higher than 40 mg / g).
  • a small particle size carbon black having a small particle size and a high reinforcing effect By using at least two types of carbon black having different particle sizes, both fuel saving and reinforcing effect can be achieved.
  • the small particle size carbon black include SAF, ISAF-HM, ISAF-LM, HAF-LS, HAF, and HAF-HS. These carbon blacks can be used alone or in combination of two or more.
  • the number average primary particle size of the small particle size carbon black may be less than 40 nm, for example, 5 to 38 nm, preferably 10 to 35 nm, more preferably about 15 to 30 nm.
  • the former / the latter 20/80 to 55/45, preferably 25 / It may be about 75 to 50/50, more preferably about 30/70 to 50/50.
  • there is too much ratio of small particle size carbon black among carbon black there exists a possibility that a fuel-saving property may fall, and there exists a possibility that a reinforcement effect may fall when there are too many large particle size carbon blacks.
  • the proportion of the reinforcing agent may be 40 parts by mass or more based on 100 parts by mass of the rubber component, for example, 50 to 200 parts by mass, preferably 60 to 180 parts by mass, more preferably 80 to 150 parts by mass (particularly 100 parts by mass). (About 120 parts by mass). In the present invention, even when the proportion of the reinforcing agent is large, the torcloth can be reduced.
  • the proportion of the reinforcing fibers may be 80 parts by mass or less (for example, 0 to 80 parts by mass) with respect to 100 parts by mass of the rubber component, for example, 60 parts by mass or less (for example, 1 to 60 parts by mass), preferably 50 parts by mass. Part or less (for example, 5 to 50 parts by mass), more preferably about 40 parts by mass or less (for example, 10 to 40 parts by mass). If the proportion of reinforcing fibers is too large, there is a possibility that the torque cross cannot be reduced.
  • the proportion of carbon black may be 10 parts by mass or more with respect to 100 parts by mass of the rubber component, for example, 20 to 180 parts by mass, preferably 30 to 150 parts by mass, more preferably 50 to 120 parts by mass (particularly 60 parts). (About 100 parts by mass).
  • the rubber composition for forming the compression rubber layer further includes other plasticizer (or softener) having a solubility index equal to or lower than the solubility index of the rubber component, in addition to the rubber component and the soundproofing improver. Also good.
  • the other plasticizer is, for example, 6.0 to 8.1 (cal / cm 3 ) 1/2 , preferably 6.5 to 8.0 (cal / cm) when the rubber component is an ethylene- ⁇ -olefin elastomer. 3 ) 1/2 , more preferably, a plasticizer having a solubility index of about 7.0 to 7.8 (cal / cm 3 ) 1/2 .
  • other plasticizers include oils such as paraffin oil, naphthenic oil, and process oil.
  • the ratio of the other plasticizer (softener) may be 30 parts by mass or less with respect to 100 parts by mass of the rubber component, for example, 1 to 30 parts by mass, preferably 3 to 25 parts by mass, and more preferably 5 to 5 parts by mass. About 20 parts by mass (particularly 7 to 15 parts by mass).
  • the rubber composition forming the compression rubber layer may further contain a vulcanizing agent in addition to the rubber component and the soundproofing improver.
  • vulcanizing agent or cross-linking agent
  • conventional components can be used depending on the type of rubber component.
  • organic peroxides diacyl peroxide, peroxy ester, dialkyl peroxide, etc.
  • oximes quinone
  • examples thereof include dioximes
  • guanidines diphenylguanidine, etc.
  • metal oxides magnesium oxide, zinc oxide, etc.
  • These vulcanizing agents can be used alone or in combination of two or more.
  • the rubber component is an ethylene- ⁇ -olefin elastomer
  • organic peroxides, sulfur-based vulcanizing agents and the like are generally used as vulcanizing agents.
  • the proportion of the vulcanizing agent can be selected from a range of about 1 to 20 parts by mass with respect to 100 parts by mass of the rubber component depending on the types of the vulcanizing agent and the rubber component.
  • the ratio of the organic peroxide as the vulcanizing agent is 1 to 8 parts by weight, preferably 1.5 to 5 parts by weight, and more preferably about 2 to 4.5 parts by weight with respect to 100 parts by weight of the rubber component. It is.
  • the rubber composition forming the compression rubber layer may further contain a co-crosslinking agent such as bismaleimides (arene bismaleimide such as N, N′-m-phenylene dimaleimide or aromatic bismaleimide).
  • a co-crosslinking agent such as bismaleimides (arene bismaleimide such as N, N′-m-phenylene dimaleimide or aromatic bismaleimide).
  • the ratio of the co-crosslinking agent can be selected from the range of about 0.01 to 10 parts by weight, for example, 0.1 to 10 parts by weight, preferably 0.5 to 6 parts by weight, more preferably 100 parts by weight of the rubber component. Is about 1 to 5 parts by mass.
  • the rubber composition forming the compression rubber layer may contain a conventional additive as another additive in addition to the rubber component and the soundproofing improver.
  • vulcanization accelerators examples include vulcanization accelerators, vulcanization retarders, processing agents or processing aids (stearic acid, metal stearate, wax, paraffin, fatty acid amide, etc.), stabilizers or anti-aging agents ( UV absorbers, antioxidants, anti-aging agents or heat stabilizers, anti-bending cracking agents, anti-ozone degradation agents, etc.), coloring agents, adhesion improvers [resorcin-formaldehyde cocondensates, hexamethoxymethyl melamine, etc.
  • Melamine resins, co-condensates thereof resorcin-melamine-formaldehyde co-condensate, etc.
  • tackifiers plasticizers
  • coupling agents silane coupling agents, etc.
  • lubricants flame retardants
  • antistatic agents Etc. may be included.
  • the ratio of these other additives can be selected from a conventional range depending on the type, for example, about 0.1 to 5 parts by mass (particularly 0.5 to 3 parts by mass) with respect to 100 parts by mass of the rubber component. It may be.
  • the method for producing the V-ribbed belt of the present invention is not particularly limited, and a known or conventional method can be adopted.
  • a compressed rubber layer, an adhesive layer in which a core body is embedded, and an extension layer are each formed from an unvulcanized rubber composition and laminated, and the laminated body is molded into a cylindrical shape with a molding die, and added. It can be formed by forming a sleeve by vulcanization and cutting the vulcanized sleeve to a predetermined width. More specifically, the V-ribbed belt can be manufactured by the following method.
  • a stretch layer sheet is wound around a cylindrical molding mold having a smooth surface, and a core wire (twisted cord) forming a core is spirally spun on the sheet, and further, an adhesive layer sheet and compressed rubber A layered sheet is sequentially wound to produce a molded body. Thereafter, a jacket for vulcanization is placed on the molded body, the mold (molding die) is accommodated in a vulcanizing can, vulcanized under predetermined vulcanization conditions, and then removed from the molding mold to form a cylindrical shape. A vulcanized rubber sleeve is obtained.
  • the outer surface (compressed rubber layer) of the vulcanized rubber sleeve is polished with a grinding wheel to form a plurality of ribs, and then the vulcanized rubber sleeve is cut to a predetermined width in the longitudinal direction of the belt using a cutter.
  • a V-ribbed belt By reversing the cut belt, a V-ribbed belt provided with a compressed rubber layer having a rib portion on the inner peripheral surface can be obtained.
  • a cylindrical inner mold with a flexible jacket attached to the outer peripheral surface is used as the inner mold, and an unvulcanized stretch layer sheet is wound around the outer peripheral flexible jacket, and a core is formed on the sheet.
  • the core wire to be spirally spun and wound with an unvulcanized compressed rubber layer sheet to produce a laminate.
  • an outer mold that can be attached to the inner mold a cylindrical outer mold in which a plurality of rib molds are engraved on the inner peripheral surface is used, and an inner mold in which the laminate is wound is provided in the outer mold. Install concentrically.
  • the flexible jacket is expanded toward the inner peripheral surface (rib type) of the outer mold, and the laminate (compressed rubber layer) is press-fitted into the rib mold and vulcanized. Then, after extracting the inner mold from the outer mold and removing the vulcanized rubber sleeve having a plurality of ribs from the outer mold, the vulcanized rubber sleeve is cut to a predetermined width in the longitudinal direction of the belt using a cutter. Finish the ribbed belt.
  • a laminated body including an extension layer, a core body, and a compressed rubber layer can be expanded at a time to be finished into a sleeve (or V-ribbed belt) having a plurality of ribs.
  • hird production method In connection with the second production method, for example, a method disclosed in Japanese Patent Application Laid-Open No. 2004-82702 (only a compression rubber layer is expanded to form a preform (semi-vulcanized state), A method in which the core body is expanded and pressure-bonded to the preform, and vulcanized and integrated into a V-ribbed belt) may be employed.
  • EPDM “EPT2060M” manufactured by Mitsui Chemicals, Inc.
  • Nylon short fiber 66 nylon, average fiber diameter 27 ⁇ m, average fiber length 3 mm
  • Cotton short fiber Denim, average fiber diameter 13 ⁇ m, average fiber length 6mm
  • Zinc oxide “Zinc oxide 3 types” manufactured by Shodo Chemical Industry Co., Ltd.
  • Stearic acid Tsubaki stearic acid manufactured by NOF Corporation Carbon black HAF: “Seast 3” manufactured by Tokai Carbon Co., Ltd., average particle size 28 nm Carbon black FEF: “Seast SO” manufactured by Tokai Carbon Co., Ltd., average particle size 43 nm Hydrous silica: “Nippil VN3” manufactured by Tosoh Silica Corporation Paraffinic oil (softener): “Diana Process Oil PW-90” manufactured by Idemitsu Kosan Co., Ltd.
  • Surfactant Polyoxyalkylene alkyl ether, “New Coal 2304-Y” manufactured by Nippon Emulsifier Co., Ltd.
  • Ether ester plasticizer “RS-700” manufactured by ADEKA Corporation Calcium carbonate: “Whiteon SSB” manufactured by Shiraishi Calcium Co., Ltd.
  • Talc “RL217” manufactured by Fuji Talc Kogyo Co., Ltd., median diameter 20 ⁇ m
  • Polyethylene particles “Hi-Z Million 240S” manufactured by Mitsui Chemicals, Inc.
  • Organic peroxide “Park Mill D-40” manufactured by NOF Corporation
  • Vulcanization accelerator A Tetramethylthiuram disulfide (TMTD)
  • Vulcanization accelerator B N-cyclohexyl-2-benzothiazyl-sulfenamide (CBS)
  • Co-crosslinking agent A p, p′-dibenzylquinone dioxime, “Barunok DGM” manufactured by Ouchi Shinsei Chemical Co., Ltd.
  • Co-crosslinking agent B N, N'-m-phenylene dimaleimide, "Barunok PM” manufactured by Ouchi Shinsei Chemical Co., Ltd.
  • Core wire a twisted yarn cord obtained by adhering a cord of total denier 6,000, which is a 2 ⁇ 3 twisted configuration of 1,000 denier PET fiber, and twisted at an upper twist factor of 3.0 and a lower twist factor of 3.0, Core wire diameter 1.0mm
  • Examples 1 to 22 and Comparative Examples 1 to 18 Manufacture of V-ribbed belt
  • the rubber composition for forming an extension layer, the rubber composition for forming a compression rubber layer, and the rubber composition for forming an adhesive layer shown in Tables 1 and 2 are each kneaded using a known method such as a Banbury mixer.
  • the kneaded rubber was passed through a calender roll to prepare a stretch layer forming sheet, a compressed rubber layer forming sheet and an adhesive layer forming sheet having a predetermined thickness.
  • a V-ribbed belt was prepared using the following known method.
  • a stretch layer sheet is wound around a cylindrical molding mold having a smooth surface, and a core wire (twisted cord) that forms a core on the stretch layer sheet is spirally spun to form an adhesive layer sheet, compressed
  • the rubber layer sheets were sequentially wound to form a molded body.
  • the molding mold is placed on a vulcanizing can with the vulcanization jacket placed on the molded body, vulcanized at a temperature of 160 ° C. for 30 minutes, and then demolded from the molding mold.
  • a cylindrical vulcanized rubber sleeve was obtained.
  • the vulcanized rubber sleeve is formed with a predetermined width in the longitudinal direction of the belt using a cutter. And finished into a V-ribbed belt.
  • V-ribbed belt dimensions 5 and Table 3, the obtained V-ribbed belt has a distance a from the center of the core [2] to the back of the V-ribbed belt [1] of 1.00 mm, and the bottom of the core [3] to the back of the V-ribbed belt [
  • the distance b from the rib bottom [4] to the V-ribbed belt back [1] is 2.30 mm and the distance d from the rib tip [5] to the V-ribbed belt back [1] is 1.50 mm.
  • a V-ribbed belt (4 ribs, length 750 mm) is wound around a two-axis running test machine composed of a driving (Dr) pulley having a diameter of 55 mm and a driven (Dn) pulley having a diameter of 55 mm.
  • Dr driving
  • Dn driven
  • a predetermined initial tension was applied to the V-ribbed belt in the tension range of 100 to 600 N / one belt, and the difference between the driving torque and the driven torque when the driving pulley was rotated at 2000 rpm without a driven pulley was calculated as a torque cross.
  • Tables 4-6 The results obtained are shown in Tables 4-6.
  • the table shows the torcloth when an initial tension of 500 N was applied.
  • the torque cross required by this measurement includes the torque cross resulting from the bearing of the testing machine in addition to the torque cross due to the bending loss of the V-ribbed belt. Therefore, a metal belt (material: maraging steel) considered to have a torque cross as a V-ribbed belt of substantially zero is run in advance, and the difference between the drive torque and the driven torque at this time is a torque cross due to the bearing (bearing loss). Therefore, a value obtained by subtracting the torque cross caused by the bearing from the torque cross calculated by running the V-ribbed belt (the torque cross resulting from the V-ribbed belt and the bearing) was obtained as the torque cross resulting from the single V-ribbed belt.
  • the torcross (bearing loss) to be subtracted is the torcross when the metal belt is run at a predetermined initial tension (for example, when a V-ribbed belt is run at an initial tension of 500 N / one belt, the metal belt is moved at this initial tension. (Torcross when running).
  • ⁇ No abnormal noise was generated.
  • ⁇ Small abnormal noise was generated within 3 seconds.
  • ⁇ A small noise was generated within 3 seconds (can be heard in the engine room but not in the car. NG when a high level of quietness is required, but normally no problem)
  • X A continuous abnormal noise of 3 seconds or more was generated.
  • the testing machine used for the evaluation is a drive (Dr) pulley (diameter 101 mm), an idler (Id) pulley (diameter 70 mm), a driven (Dn) pulley (diameter 120 mm), and a tension (Ten) pulley. (Diameter 61 mm) was arranged, and misalignment was set at an angle of 1.5 ° between the driving pulley and the driven pulley.
  • a V-ribbed belt (6 ribs, 1200 mm in length) was hung between each pulley of the test machine, and the drive pulley was run at a rotation speed of 1000 rpm under 25 ° C conditions. At this time, a load was applied to the drive pulley so that the belt tension was 50 N / rib. Then, the occurrence of stick-slip abnormal noise (abnormal sound heard as “curculle”) when water was poured into the belt at 100 ml / min for 1 minute was confirmed, and the evaluation was made according to the same criteria as the pronunciation measurement in an actual vehicle. The results are shown in Tables 4-6.
  • the adhesion wear test is a test machine in which a drive (Dr) pulley (diameter 120 mm), an idler (Id) pulley (diameter 45 mm), and a driven (Dn) pulley (diameter 120 mm) are arranged in this order. Used.
  • a V-ribbed belt (4 ribs, 1200 mm in length) is hung on each pulley of the testing machine, the rotational speed of the driving pulley is 4900 rpm, the load of the idler pulley and the driven pulley is 11.7 kW, and the initial belt tension ( 940 N / 4 ribs) was applied, and the belt was run at an ambient temperature of 25 ° C. for 5 hours.
  • production of the adhesion wear abnormal sound by adhesion
  • O A small amount of adhesive wear occurred, but there was no problem in running performance.
  • X Adhesive wear that caused problems in running occurred.
  • the difference between the level of “0.30 to 0.34 N ⁇ m” and the level of “0.20 to 0.24 N ⁇ m”, that is, the torque cross is reduced by “0.06 to 0.14 N ⁇ m”. What is done is, for example, a significant difference corresponding to an improvement of 0.2% in the fuel consumption of a light vehicle (improvement of fuel consumption by 0.1% in the automobile field is a great effect).
  • a V-ribbed belt and a V pulley An analysis model was created, and the energy due to compressive strain, which is an index of energy loss due to heat generation, was analyzed by computer simulation. The result is shown in FIG. 10.
  • Example 4 in which the angle difference ⁇ is large and a gap with the pulley is generated at the tip of the V-rib, the energy due to the compressive strain near the tip of the V-rib is smaller. I understand that.
  • the V-ribbed belt of the present invention can be used as a V-ribbed belt for various belt transmission systems, and is particularly useful as a system including a small-diameter pulley such as an alternator as a power generator, for example, a V-ribbed belt for an automobile engine accessory drive system.

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  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Textile Engineering (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

Courroie à nervures en v comprenant une couche de caoutchouc de compression qui comporte une pluralité de sections à nervures en v qui s'étendent dans la direction longitudinale de la courroie et sont mutuellement parallèles et présente une face de transmission de frottement, dont au moins une partie peut entrer en contact avec une rainure à nervures en v d'une poulie, la face de transmission de frottement de la couche de caoutchouc de compression étant formée avec un vulcanisat d'une composition de caoutchouc contenant un composant de caoutchouc et un agent pour améliorer l'insonorisation, et l'angle à nervures en v de la partie à nervures en v est de 5° à 9° plus grand que l'angle de rainure à nervures en v de la poulie.
PCT/JP2017/030600 2016-08-29 2017-08-25 Courroie à nervures en v et son utilisation WO2018043355A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP17846360.0A EP3505792B1 (fr) 2016-08-29 2017-08-25 Courroie à nervures en v et son utilisation
US16/329,289 US11668371B2 (en) 2016-08-29 2017-08-25 V-ribbed belt and use thereof
CN201780052510.5A CN109642640B (zh) 2016-08-29 2017-08-25 多楔带及其用途

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JP2016166923 2016-08-29
JP2016-166923 2016-08-29
JP2017159935A JP6553687B2 (ja) 2016-08-29 2017-08-23 Ｖリブドベルト及びその用途
JP2017-159935 2017-08-23

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023147464A1 (fr) * 2022-01-28 2023-08-03 Timken Smo Llc Courroie à nervures en v

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WO2023147464A1 (fr) * 2022-01-28 2023-08-03 Timken Smo Llc Courroie à nervures en v

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