WO2018216738A1 - Courroie striée et procédé de fabrication correspondant - Google Patents

Courroie striée et procédé de fabrication correspondant Download PDF

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Publication number
WO2018216738A1
WO2018216738A1 PCT/JP2018/019874 JP2018019874W WO2018216738A1 WO 2018216738 A1 WO2018216738 A1 WO 2018216738A1 JP 2018019874 W JP2018019874 W JP 2018019874W WO 2018216738 A1 WO2018216738 A1 WO 2018216738A1
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WO
WIPO (PCT)
Prior art keywords
yarn
knitted fabric
ribbed belt
polyamide
weft
Prior art date
Application number
PCT/JP2018/019874
Other languages
English (en)
Japanese (ja)
Inventor
浩平 ▲濱▼本
西山　健
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.)
Filing date
Publication date
Priority claimed from JP2018097341A external-priority patent/JP6717877B2/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 CA3064366A priority Critical patent/CA3064366C/fr
Priority to CN201880033319.0A priority patent/CN110651137B/zh
Priority to EP18806498.4A priority patent/EP3633232B1/fr
Priority to KR1020197034408A priority patent/KR102239997B1/ko
Priority to US16/615,963 priority patent/US11913522B2/en
Publication of WO2018216738A1 publication Critical patent/WO2018216738A1/fr

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    • D10B2331/04—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyesters, e.g. polyethylene terephthalate [PET]

Definitions

  • the present invention relates to a V-ribbed belt having a friction transmission surface covered with a knitted fabric and a method for manufacturing the same.
  • the belt for transmitting power is widely used for power transmission of auxiliary equipment such as an air compressor and an alternator of an automobile.
  • auxiliary equipment such as an air compressor and an alternator of an automobile.
  • sounds other than engine sounds are abnormal noises, there is a demand for measures for sound generation of belts.
  • the cause of this belt's sound is a slip noise when the belt slips between the belt and the pulley under large fluctuations in belt speed and high load conditions.
  • the friction coefficient of the belt may be reduced and slip noise may occur frequently.
  • a knitted fabric is knitted with a bulky polyester composite yarn and a cellulose natural spun yarn to absorb water.
  • Cellulose-based natural spun yarn that excels in water absorbs water quickly, thereby suppressing a decrease in the coefficient of friction in a wet state and improving water-pouring sound resistance.
  • the cellulose-based natural spun yarn has low abrasion resistance, the cellulose-based natural spun yarn wears with use, the water absorption decreases, and the coefficient of friction in the wet state decreases. There is a possibility that the pronunciation cannot be maintained for a sufficiently long period.
  • an object of the present invention is to provide a V-ribbed belt in which a friction transmission surface is covered with a knitted fabric having excellent wear resistance and a method for producing the same for the purpose of maintaining the water-sounding sound resistance over a long period of time.
  • the present invention for solving the above problems is a V-ribbed belt in which the friction transmission surface is composed of a weft knitted multilayer knitted fabric,
  • the weft knitted multilayer knitted fabric includes a cellulose-based natural spun yarn, a polyester-based composite yarn, and a polyamide-based yarn, and at least the cellulose-based natural spun yarn and the polyamide-based yarn are on the friction transmission surface side. It is characterized by being arranged in layers.
  • the weft knitted multi-layer knitted fabric covering the friction transmission surface contains the cellulose-based natural spun yarn
  • the water absorption of the V-ribbed belt can be increased and the water injection resistance can be improved.
  • the weft knitted multilayer knitted fabric includes a polyester-based composite yarn
  • the stretchability of the weft knitted multilayer knitted fabric is improved, and the weft knitted multilayer knitted fabric when forming the V-shaped rib portion on the belt with a die is used.
  • the adaptability to the V-shaped rib portion can be enhanced.
  • the weft knitted multilayer knitted fabric includes polyamide-based yarns, so that the abrasion resistance can be improved and the cellulose-based natural spun yarns can be prevented from being worn.
  • the knitted fabric since weft knitting is used as the knitted fabric that covers the friction transmission surface, the shape of the rib portion is poor in the manufacturing process of the V-ribbed belt in which the V-shaped rib portion is formed on the belt with a mold. Can be made difficult to occur. Further, by making the knitted fabric a multilayer structure, the rubber constellation, which is a constituent element of the V-ribbed belt, is prevented from seeping out to the friction transmission surface side, and the friction coefficient in the dry state of the friction transmission surface and the wet Since the difference in the coefficient of friction in the state can be reduced, the water injection resistance can be improved.
  • the content of the polyamide-based yarn may be 5 to 60% by mass.
  • the wear resistance can be improved without impairing the water injection resistance of the V-ribbed belt. If the content of the polyamide yarn is less than 5% by mass, the wear resistance may be lowered. If the content of the polyamide-based yarn is more than 60% by mass, the water absorption may be lowered and the water injection resistance may be lowered.
  • the polyamide yarn content is preferably 15 to 60% by mass, more preferably 20 to 55% by mass, and further preferably 20 to 40% by mass.
  • the weft-knitted multilayer knitted fabric of the V-ribbed belt may have a content of the cellulose-based natural spun yarn of 5 to 60% by mass.
  • the wear resistance can be improved without impairing the water injection resistance of the V-ribbed belt. If the content of the cellulose-based natural spun yarn is less than 5% by mass, the water absorption may be lowered and the water injection resistance may be lowered. When the content of the cellulose-based natural spun yarn is more than 60% by mass, the wear resistance may be lowered. In the weft knitted multilayer knitted fabric, the content of the cellulose-based natural spun yarn is preferably 5 to 55% by mass, more preferably 5 to 40% by mass, and further preferably 20 to 40% by mass.
  • the wear resistance can be improved without impairing the water injection resistance of the V-ribbed belt. If the content of the polyamide yarn is small, the wear resistance is lowered, and if the content of the polyamide yarn is high, the water absorption is lowered, so that the water injection resistance is lowered.
  • the mass ratio of the polyamide-based yarn and the cellulose-based natural spun yarn is preferably 10:90 to 90:10, more preferably 20:80 to 80:20, and 30:70 to 70:30 is more preferable.
  • the polyester composite yarn included in the weft knitted multilayer knitted fabric may be a bulky processed yarn made of two or more kinds of polymers having different heat shrinkage rates.
  • the weft knitted multilayer knitted fabric can be provided with stretchability and bulkiness.
  • the adaptability of the weft knitted multilayer knitted fabric to the V-shaped rib portion can be enhanced.
  • the seepage of the friction transmission surface through the rubber knitted fabric, which is a constituent element of the V-ribbed belt, is suppressed, and the difference between the friction coefficient in the dry state and the friction coefficient in the wet state is reduced. Therefore, it is possible to improve the water injection resistance.
  • the polyester composite yarn contained in the weft knitted multilayer knitted fabric may be a conjugate yarn containing polyethylene terephthalate (PET).
  • PET polyethylene terephthalate
  • the stretchability, bulkiness and wear resistance of the weft knitted multilayer knitted fabric can be improved.
  • the conjugate yarn containing polyethylene terephthalate is excellent in availability, the cost can be reduced.
  • the polyamide yarn included in the weft knitted multilayer knitted fabric may include nylon or aramid fiber.
  • Weft knitted multi-layer knitted fabrics containing nylon or aramid fibers have high wear resistance, so they are highly effective in suppressing the abrasion of cellulosic natural spun yarns and maintain water injection sound resistance over a long period of time. Can do.
  • the yarns constituting the weft knitted multilayer knitted fabric may each twist a filament or a fiber.
  • Wear resistance is improved by converging filaments and fibers on the yarns constituting the weft knitted multilayer fabric.
  • the knitted fabric can be easily knitted and the filaments and fibers can be prevented from fluffing, thereby improving the appearance quality of the V-ribbed belt. be able to.
  • the weft knitted multilayer knitted fabric may not contain polyurethane.
  • the weft knitted multilayer knitted fabric does not contain polyurethane having low water absorption and abrasion resistance as compared with the fiber material, it is possible to prevent the water absorbency and abrasion resistance of the weft knitted multilayer knitted fabric from being deteriorated.
  • the polyester type composite yarn excellent in elasticity is included, elasticity is ensured.
  • a thickness of the weft knitted multilayer knitted fabric covering the friction transmission surface may be 0.6 mm or more.
  • the thickness of the weft knitted multilayer knitted fabric By setting the thickness of the weft knitted multilayer knitted fabric to 0.6 mm or more, the seepage to the friction transmission surface via the rubber knitted fabric which is a constituent element of the V-ribbed belt is suppressed, and the friction transmission surface is in a dry state. Since the difference between the coefficient of friction and the coefficient of friction in the wet state can be reduced, the water injection resistance can be improved. In addition, if the thickness of the weft knitted multilayer knitted fabric is 0.7 mm or more, it is possible to more reliably suppress the seepage to the friction transmission surface side through the rubber knitted fabric which is a constituent element of the V-ribbed belt. 0.8 mm or more is preferable.
  • the upper limit value of the thickness of the weft knitted multilayer knitted fabric is not particularly limited, but may be, for example, 1.5 mm or less.
  • the cellulose-based natural spun yarn and the polyamide-based yarn may be uniformly dispersed in the layer on the friction transmission surface side of the weft knitted multilayer knitted fabric of the V-ribbed belt. .
  • the polyamide-based yarn is closer to the cellulosic natural spun yarn than when several yarns are arranged together. Therefore, the wear of the cellulosic natural spun yarn can be more reliably suppressed. In addition, since there is no unevenness in water absorption, water-sounding sound resistance can be improved.
  • the V-ribbed belt includes rubber as a component,
  • the weft knitted multilayer knitted fabric is coated on the friction transmission surface side of the rubber, The rubber may not ooze from the weft knitted multilayer knitted fabric to the friction transmission surface.
  • no rubber exudation means that the area ratio of the rubber exposed to the friction transmission surface is less than 5%.
  • the present invention is a method for producing the V-ribbed belt, Cover the weft knitted multilayer knitted fabric with both ends of the weft knitted multilayer knitted fabric on the unvulcanized compressed layer sheet, or on the unvulcanized compressed layer sheet, the weft knitted multilayer knitted fabric It may be characterized in that both ends of the cloth are jointed.
  • FIG. 1 is a schematic perspective view illustrating an example of a belt transmission device using a V-ribbed belt according to the present invention.
  • FIG. 2 is a cross-sectional view of the V-ribbed belt along the A-A ′ section of FIG. 1.
  • FIG. 3 is an explanatory view showing an example (A) in which cellulosic natural spun yarn and polyamide yarn are uniformly dispersed in the knitted fabric, and an example (B) in which the yarn is not uniformly dispersed.
  • FIG. 4 is a conceptual diagram illustrating a method for manufacturing a V-ribbed belt.
  • FIG. 5 is a conceptual diagram illustrating a friction coefficient measurement test in a dry state (a) and a wet state (b).
  • FIG. 6 is a conceptual diagram illustrating a misalignment pronunciation evaluation test.
  • FIG. 1 shows an example of a belt drive device for driving an auxiliary machine using a V-ribbed belt 1 according to the present invention.
  • This belt transmission is the simplest example in which the drive pulley 21 and the driven pulley 22 are provided one by one, and the V-ribbed belt 1 is wound between the drive pulley 21 and the driven pulley 22.
  • the endless V-ribbed belt 1 is formed with a plurality of V-shaped rib portions 2 extending in the belt circumferential length direction on the inner peripheral side, and the V-ribbed belt 1 is provided on the outer peripheral surfaces of the drive pulley 21 and the driven pulley 22.
  • a plurality of V-shaped grooves 23 into which the respective rib portions 2 are fitted are provided.
  • the V-ribbed belt 1 includes an extension layer 3 that forms the belt back surface on the outer periphery side, a compression layer 4 provided on the inner periphery side of the extension layer 3, and the extension layer 3 and the compression layer 4. And a core wire 5 embedded in the circumferential direction of the belt embedded therebetween, and a plurality of V-shaped rib portions 2 extending in the circumferential direction of the belt are formed in the compression layer 4, and the surface of the rib portion 2 serving as a friction transmission surface Is covered with a knitted fabric 6.
  • the stretch layer 3 and the compression layer 4 are both formed of a rubber composition as will be described later.
  • An adhesive layer may be provided between the stretch layer 3 and the compression layer 4 as necessary.
  • This adhesive layer is provided for the purpose of improving the adhesion between the core wire 5 and the stretched layer 3 and the compressed layer 4, but is not essential.
  • the entire core wire 5 may be embedded in the adhesive layer, or the core wire 5 may be embedded between the adhesive layer and the stretch layer 3 or between the adhesive layer and the compression layer 4. Good.
  • Examples of rubber components of the rubber composition forming the compression layer 4 include vulcanizable or crosslinkable rubbers such as diene rubbers (natural rubber, isoprene rubber, butadiene rubber, chloroprene rubber, styrene butadiene rubber, acrylonitrile butadiene rubber, hydrogen Nitrile rubber, mixed polymer of hydrogenated nitrile rubber and unsaturated carboxylic acid metal salt), ethylene- ⁇ -olefin elastomer, chlorosulfonated polyethylene rubber, alkylated chlorosulfonated polyethylene rubber, epichlorohydrin rubber, acrylic rubber, Silicone rubber, urethane rubber, fluororubber, etc. are mentioned.
  • diene rubbers natural rubber, isoprene rubber, butadiene rubber, chloroprene rubber, styrene butadiene rubber, acrylonitrile butadiene rubber, hydrogen Nitrile rubber, mixed polymer of hydrogenated nitrile rubber and unsatur
  • ethylene- ⁇ -olefin elastomer ethylene- ⁇ -olefin rubber
  • ethylene- ⁇ -olefin rubber is preferred because it has ozone resistance, heat resistance, cold resistance, and is excellent in economy.
  • the ethylene- ⁇ -olefin elastomer include ethylene- ⁇ -olefin rubber (such as ethylene-propylene rubber) and ethylene- ⁇ -olefin-diene rubber (such as ethylene-propylene-diene copolymer).
  • Examples of the ⁇ -olefin include propylene, butene, pentene, methylpentene, hexene, octene and the like. These ⁇ -olefins can be used alone or in combination of two or more.
  • Examples of the diene monomer used as a raw material include non-conjugated diene monomers such as dicyclopentadiene, methylene norbornene, ethylidene norbornene, 1,4-hexadiene, and cyclooctadiene. These diene monomers can be used alone or in combination of two or more.
  • the ratio of ethylene to ⁇ -olefin (the mass ratio of the former / the latter) is 40/60 to 90/10, preferably 45/55 to 85/15, more preferably 55/45.
  • a range of ⁇ 80/20 is preferred.
  • the proportion of diene can be selected from the range of 4 to 15% by mass, for example, 4.2 to 13% by mass, preferably 4.4 to 11.5% by mass.
  • the iodine value of the ethylene- ⁇ -olefin elastomer containing the diene component is, for example, in the range of 3 to 40, preferably 5 to 30, and more preferably 10 to 20.
  • iodine value is measured by adding excess iodine to the sample to be reacted completely (reaction between iodine and unsaturated bonds), and quantifying the amount of remaining iodine by redox titration. It is done.
  • organic peroxide that crosslinks the unvulcanized rubber layer examples include diacyl peroxide, peroxy ester, dialkyl peroxide (dicumyl peroxide, t-butylcumyl peroxide, 1,1-di-butylperoxy-3). , 3,5-trimethylcyclohexane, 2,5-dimethyl-2,5-di (t-butylperoxy) -hexane, 1,3-bis (t-butylperoxy-isopropyl) benzene, di-t-butyl Peroxide) and the like. These organic peroxides can be used alone or in combination of two or more. Further, the organic peroxide has a temperature range in which the half-life by thermal decomposition is 1 minute is 150 ° C. to 250 ° C., preferably about 175 ° C. to 225 ° C.
  • the proportion of the vulcanizing agent or crosslinking agent (especially organic peroxide) in the unvulcanized rubber layer is 1 to 10 parts by mass in terms of solid content with respect to 100 parts by mass of the rubber component (ethylene- ⁇ -olefin elastomer etc.).
  • the amount is preferably 1.2 to 8 parts by mass, more preferably 1.5 to 6 parts by mass.
  • the rubber composition may contain a vulcanization accelerator.
  • the vulcanization accelerator include thiuram accelerators, thiazole accelerators, sulfenamide accelerators, bismaleimide accelerators, urea accelerators, and the like. These vulcanization accelerators can be used alone or in combination of two or more.
  • the proportion of the vulcanization accelerator (meaning the total amount when a plurality of types are combined and the same applies when a plurality of types are combined thereafter) is 0.5 to 15 in terms of solid content with respect to 100 parts by mass of the rubber component.
  • the amount is preferably 1 to 10 parts by mass, more preferably 2 to 5 parts by mass.
  • the rubber composition may further contain a co-crosslinking agent (crosslinking aid or co-vulcanizing agent) in order to increase the degree of cross-linking and prevent adhesive wear and the like.
  • a co-crosslinking agent crosslinking aid or co-vulcanizing agent
  • co-crosslinking agent include conventional crosslinking aids such as polyfunctional (iso) cyanurates (triallyl isocyanurate, triallyl cyanurate, etc.), polydienes (1,2-polybutadiene, etc.), and metal salts of unsaturated carboxylic acids.
  • crosslinking aids can be used alone or in combination of two or more.
  • the ratio of the crosslinking aid is 0.01 to 10 parts by weight, preferably 0.05 to 8 parts by weight, based on 100 parts by weight of the rubber component, in terms of solid content.
  • the rubber composition may contain short fibers as necessary.
  • Short fibers include cellulosic fibers (cotton, rayon, etc.), polyester fibers (PET, PEN fibers, etc.), aliphatic polyamide fibers (6 nylon fibers, 66 nylon fibers, 46 nylon fibers, etc.), aromatic polyamide fibers ( p-aramid fiber, m-aramid fiber, etc.), vinylon fiber, polyparaphenylene benzobisoxazole (PBO) fiber and the like.
  • These short fibers may be subjected to conventional adhesion treatment or surface treatment such as treatment with an RFL solution in order to improve dispersibility and adhesion in the rubber composition.
  • the proportion of the short fibers may be 1 to 50 parts by mass, preferably 5 to 40 parts by mass, and more preferably 10 to 35 parts by mass with respect to 100 parts by mass of the rubber component.
  • the rubber composition may be prepared by adding conventional additives such as vulcanization aids, vulcanization retarders, reinforcing agents (carbon black, silicon oxide such as hydrous silica), fillers (clay, carbonic acid) as necessary.
  • vulcanization aids carbon black, silicon oxide such as hydrous silica
  • fillers clay, carbonic acid
  • Calcium, talc, mica, etc. metal oxides (zinc oxide, magnesium oxide, calcium oxide, barium oxide, iron oxide, copper oxide, titanium oxide, aluminum oxide, etc.), plasticizers (paraffinic oil, naphthenic oil, process) Oils, etc.), processing agents or processing aids (stearic acid, metal stearate, wax, paraffin, fatty acid amide, etc.), anti-aging agents (antioxidants, thermal anti-aging agents, anti-bending cracks, Ozone degradation inhibitors, etc.), coloring agents, tackifiers, coupling agents (silane coupling agents, etc.), stabilizers (ultraviolet absorbers,
  • the metal oxide may act as a crosslinking agent.
  • These additives can be used alone or in combination of two or more.
  • the ratio of these additives can be selected from a conventional range depending on the type.
  • the ratio of the reinforcing agent carbon black, silica, etc.
  • the ratio of metal oxide such as zinc oxide
  • the ratio of plasticizer such as oils such as paraffin oil
  • the proportion of -30 parts by mass (preferably 5-25 parts by mass) and the processing agent (eg stearic acid) may be 0.1-5 parts by mass (preferably 0.5-3 parts by mass).
  • the stretch layer 3 may be formed of the same rubber composition as the compression layer 4 (rubber composition containing a rubber component such as ethylene- ⁇ -olefin elastomer), or may be formed of a fabric (reinforcing fabric) such as canvas. Also good.
  • the reinforcing cloth include cloth materials such as woven cloth, wide-angle sail cloth, knitted cloth, and non-woven cloth. Among these, preferred are woven fabrics woven in the form of plain weave, twill weave, satin weave, etc., and wide-angle canvas and knitted fabric in which the crossing angle between warp and weft is about 90 ° to 130 °.
  • the fibers constituting the reinforcing cloth the same fibers as the short fibers can be used.
  • the reinforcing cloth may be treated with an RFL solution (such as a dipping process), and then subjected to a coating process or the like to form a canvas with rubber.
  • the stretch layer 3 is preferably formed of the same rubber composition as the compression layer 4.
  • the same type or type of rubber as the rubber component of the compression layer 4 is often used.
  • the ratio of additives such as a vulcanizing agent or a crosslinking agent, a co-crosslinking agent, and a vulcanization accelerator can be selected from the same range as that of the rubber composition of the compression layer 4.
  • the rubber composition of the stretch layer 3 may contain short fibers similar to those of the compression layer 4 in order to suppress the generation of abnormal noise due to adhesion of the back rubber when the back surface is driven.
  • the form of the short fiber may be linear or may be a partially bent shape (for example, a milled fiber described in Japanese Patent Application Laid-Open No. 2007-120507).
  • an uneven pattern may be provided on the surface of the stretch layer 3 (belt backside).
  • the concavo-convex pattern include a knitted fabric pattern, a woven fabric pattern, a suede woven fabric pattern, an embossed pattern (for example, a dimple shape), and the size and depth are not particularly limited.
  • the core 5 is not particularly limited, and polyester fiber (polybutylene terephthalate fiber, polyethylene terephthalate fiber, polytrimethylene terephthalate fiber, polyethylene naphthalate fiber, etc.), aliphatic polyamide (nylon) fiber (6 nylon fiber, 66 nylon fiber) , 46 nylon fiber, etc.), aromatic polyamide (aramid) fiber (copolyparaphenylene, 3,4'oxydiphenylene, terephthalamide fiber, poly-p-phenylene terephthalamide fiber, etc.), polyarylate fiber, glass fiber, carbon A cord formed of fiber, PBO fiber, or the like can be used. These fibers can be used alone or in combination of two or more.
  • polyester fibers having a low elastic modulus particularly low elastic polybutylene terephthalate fibers
  • nylon fibers particularly 66 nylon fibers, 46 nylon fibers
  • the fiber cannot sufficiently expand even when the flexible jacket 51 expands, and the pitch of the core 5 embedded in the V-ribbed belt 1 This is because the line is not stable, or the proper shape of the rib portion 2 is not formed.
  • the expansion coefficient of the flexible jacket 51 low (for example, about 1%).
  • the knitted fabric 6 uses a weft knitting excellent in stretchability, it can be easily attached by the friction transmission surface in which irregularities are formed in the rib portion 2 (shape defect of the rib portion 2 is unlikely to occur). . Further, the knitted fabric 6 has a large thickness, excellent water absorption, can more reliably prevent the rubber component of the compression layer 4 from seeping out, and can change the yarn exposure ratio between the friction transmission surface side and the compression layer 4 side. Multilayer knitting is applied because desired characteristics can be obtained.
  • Weft and multi-layered knitted fabrics 6 include: smooth, interlock, double rib, single picket, punch Rome, Milan rib, double jersey, kanoko (front sword, back sword, both sides Kanoko).
  • the knitted fabric 6 is knitted so as to include polyester composite yarn, cellulose natural spun yarn (for example, cotton yarn), and polyamide yarn.
  • polyester composite yarn for example, cotton yarn
  • polyamide yarn at least a cellulose-based natural spun yarn and a polyamide-based yarn are arranged on the layer on the frictional transmission surface side of the knitted fabric 6 knitted in multiple layers (the surface side in contact with the driving pulley 21 and the driven pulley 22). It is organized to be. That is, the polyester composite yarn is not an essential component for the layer on the frictional transmission surface side of the knitted fabric 6.
  • the knitted fabric 6 may contain fibers other than polyester-based composite yarn, cellulose-based natural spun yarn, and polyamide-based yarn.
  • the total content of the polyester composite yarn, the cellulose natural spun yarn, and the polyamide yarn in the knitted fabric 6 is preferably 80% by mass or more.
  • the total content of the cellulose-based natural spun yarn and the polyamide-based yarn in the layer on the frictional transmission surface side of the knitted fabric 6 is preferably 70% by mass or more.
  • the polyester composite yarn is a bulky processed yarn.
  • the bulky processed yarn is a processed yarn having a larger cross section by causing the fibers to bend (crimpability) or by covering the core yarn with another yarn.
  • Bulky processed yarns include conjugate yarns, covering yarns, crimped yarns, woolly processed yarns, taslan processed yarns, interlaced yarns, etc.
  • Polyester composite yarns that are bulky processed yarns include conjugate yarns. And covering yarns are preferred.
  • the conjugate yarn preferably has a cross-sectional structure in which two or more types of polymers having different heat shrinkage rates are bonded together in the fiber axis direction.
  • the conjugate yarn having such a structure is crimped due to a difference in shrinkage rate (heat shrinkage rate) of each polymer and becomes a bulky yarn.
  • PET polyethylene terephthalate
  • PBT composite yarn conjugated with polybutylene terephthalate (PBT) and polyethylene terephthalate (PET).
  • PET conjugate yarn a composite yarn (PTT / PET conjugate yarn) conjugated with polytrimethylene terephthalate (PTT) and polyethylene terephthalate (PET)
  • PET polybutylene terephthalate
  • PET conjugate yarn polyethylene terephthalate
  • the stretchability, bulkiness, and abrasion resistance of the knitted fabric 6 can be enhanced. Moreover, since the conjugate yarn containing polyethylene terephthalate is excellent in availability, the cost can be reduced. Further, the covering yarn is a yarn in which the bulk of the entire yarn is increased by covering (covering) the periphery of the core yarn with another yarn.
  • PET polyethylene terephthalate
  • a composite yarn (PET / PU covering yarn) with a polyurethane (PU) yarn excellent in stretchability covered with polyethylene terephthalate (PET) on its surface, and a composite with a polyamide (PA) covered with PU as a core There is a thread (PA / PU covering thread).
  • PTT / PET conjugate yarns excellent in stretchability and abrasion resistance are preferred.
  • the crimpability is expressed due to the difference in the heat shrinkage ratios of the two or more types of polymers,
  • the knitted fabric 6 can be provided with stretchability and bulkiness. Thereby, in the manufacturing process in which the V-shaped rib portion 2 is formed on the V-ribbed belt 1 with the dies (inner mold 52 and outer mold 53) described later, the adaptability of the knitted fabric 6 to the V-shaped rib portion 2 is enhanced.
  • Cellulose-based natural yarn includes bamboo fiber, sugarcane fiber, seed hair fiber (cotton fiber (cotton linter), kapok, etc.), gin leather fiber (eg, hemp, kouzo, mitsumata, etc.), leaf fiber (eg, Manila hemp, New Zealand)
  • Examples thereof include yarn obtained by spinning cellulose fibers (pulp fibers) derived from natural plants such as hemp), cellulose fibers derived from animals such as wool, silk, and squirt cellulose, bacterial cellulose fibers, and algal cellulose.
  • cotton fiber is preferable in terms of excellent water absorption.
  • the content of the cellulose-based natural spun yarn in the knitted fabric 6 is set to 5 to 60% by mass.
  • the content of the cellulose-based natural spun yarn is preferably 5 to 55% by mass, more preferably 5 to 40% by mass, and further preferably 20 to 40% by mass.
  • polyamide yarn materials include aliphatic polyamide (nylon) and aromatic polyamide (aramid). Higher wear resistance can be obtained by using aromatic polyamide (aramid), but wear resistance is improved even with relatively inexpensive nylon.
  • the polyamide yarn may be a filament yarn in which long fibers are bundled, or may be a spun yarn (spun yarn) obtained by spinning short fibers (staples). In the case of filament yarn, it may be a non-twisted bundle with the filaments aligned, or a twisted yarn with the aligned filaments twisted, but from the point of increasing wear resistance and knitting workability A twisted yarn is preferred.
  • the wear resistance may be lowered.
  • the content of the polyamide yarn is more than 60% by mass, the water absorption may be lowered and the water injection resistance may be lowered. Therefore, in this embodiment, the content of the polyamide-based yarn is 5 to 60% by mass.
  • the content of the polyamide-based yarn is preferably 15 to 60% by mass, more preferably 20 to 55% by mass, and still more preferably 20 to 40% by mass.
  • the mass ratio of the polyamide-based yarn and the cellulose-based natural spun yarn is in the range of 5:95 to 95: 5.
  • the mass ratio of the polyamide-based yarn and the cellulose-based natural spun yarn is preferably 10:90 to 90:10, more preferably 20:80 to 80:20, and 30:70 to 70: A range of 30 is more preferred.
  • the cellulose-based natural spun yarn and the polyamide-based yarn are arranged so as to be uniformly dispersed.
  • at least both the cellulose-based natural spun yarn and the polyamide-based yarn are provided on the layer on the friction transmission surface side of the knitted fabric 6 knitted in multiple layers (the surface side in contact with the driving pulley 21 and the driven pulley 22). Since the wear of the cellulosic natural spun yarn is suppressed by containing the water, the water injection resistance can be maintained over a long period of time. The effect of the one located in the vicinity of the yarn (A) (uniformly arranged) is remarkably obtained.
  • the number of polyamide-based yarns the number of cellulose-based natural spun yarns
  • 1 1
  • 10 polyamide yarns and 10 cellulose natural spun yarns are knitted together, the cellulose natural spun yarns located far away from the polyamide yarns are easily worn.
  • the sound resistance to water injection tends to decrease.
  • the cellulose One polyamide yarn is knitted for every two natural spun yarns.
  • the cellulose-based natural spun yarns are arranged rather than arranging 16 cellulose-based natural spun yarns and 8 polyamide-based yarns together (see FIG. 3B). If two yarns and one polyamide yarn are arranged so as to be repeated eight times (see FIG. 3A), the polyamide yarn is positioned in the vicinity of the cellulose natural spun yarn. The wear of the natural spun yarn can be more reliably suppressed.
  • cellulosic natural spun yarn and polyamide yarn are uniformly dispersed means that at least one polyamide yarn is included in 12 adjacent yarns. Means.
  • the polyester composite yarn, the cellulose natural spun yarn, and the polyamide yarn constituting the knitted fabric 6 are preferably twisted yarns in which filaments and fibers are twisted together. Abrasion resistance is improved by converging filaments and fibers on the yarn constituting the knitted fabric 6. Further, by twisting the filaments and fibers together with the yarns constituting the knitted fabric 6 and converging, the knitted fabric can be easily knitted and the filaments and fibers can be prevented from fluffing, so that the appearance quality of the V-ribbed belt 1 is improved. Can do.
  • the knitted fabric 6 preferably does not contain polyurethane. By preventing the knitted fabric 6 from containing polyurethane having lower water absorption and wear resistance than the fiber material, the water absorption and wear resistance of the knitted fabric 6 can be prevented from being lowered. In addition, although it seems that it is inferior in elasticity because it does not contain polyurethane yarn etc. that are often used in the knitted fabric 6, the knitted fabric 6 contains polyester-based composite yarn that is excellent in elasticity, so that the elasticity is ensured. Can do. Further, the knitted fabric 6 may include polyester composite yarn, cellulose natural spun yarn, polyamide yarn, and BR> O fibers.
  • the total content of the polyester composite yarn, the cellulose natural spun yarn, and the polyamide yarn in the knitted fabric 6 is preferably 80% by mass or more.
  • the total content of the cellulose-based natural spun yarn and the polyamide-based yarn in the layer on the frictional transmission surface side of the knitted fabric 6 is preferably 70% by mass or more.
  • the thickness of the knitted fabric 6 knitted in a multilayer including the bulky processed yarn is preferably 0.6 mm or more.
  • the rubber component of the compression layer 4 is prevented from seeping out to the friction transmission surface via the knitted fabric 6, and the friction coefficient in the dry state of the friction transmission surface is suppressed.
  • the difference in coefficient of friction between the wet state and the wet state can be reduced, so that the water injection resistance can be improved.
  • the thickness of the knitted fabric 6 is 0.7 mm or more, the bleeding of the rubber component of the compression layer 4 to the friction transmission surface side through the knitted fabric 6 can be more reliably suppressed, particularly 0.8 mm. The above is preferable.
  • the knitted fabric 6 can contain or adhere a surfactant or a hydrophilic softening agent as a hydrophilic treatment agent.
  • a hydrophilization treatment agent is contained in or adhered to the knitted fabric 6, when water droplets adhere to the friction transmission surface (knitted fabric 6), the water droplets are promptly applied to the surface of the knitted fabric 6 subjected to the hydrophilization treatment.
  • the wet film spreads to form a water film, and is further absorbed by the cellulose-based natural spun yarn of the knitted fabric 6 so that the water film disappears on the friction transmission surface. Therefore, a decrease in the friction coefficient of the friction transmission surface in the wet state is further suppressed.
  • hydrophilic treatment agent a surfactant or a hydrophilic softener can be used.
  • a method for containing or attaching these hydrophilic treatment agents to the knitted fabric 6 a method of spraying the hydrophilic treatment agent onto the knitted fabric 6, a method of coating the knitted fabric 6 with the hydrophilic treatment agent, or the knitted fabric 6. It is possible to employ a method of immersing in a hydrophilizing agent.
  • the hydrophilic treatment agent is used as a surfactant, when the V-ribbed belt 1 is manufactured, the surfactant is applied to the surface of a cylindrical outer mold in which a plurality of rib molds are engraved on the inner peripheral surface.
  • a method of incorporating a surfactant into the knitted fabric 6 by sulfur molding can also be employed.
  • the method of immersing the knitted fabric 6 in the hydrophilization treatment agent is preferable because the hydrophilization treatment agent can be contained and adhered more easily and more uniformly.
  • Surfactant is a generic term for substances that have a hydrophilic group that is easily compatible with water and a hydrophobic group (lipophilic group) that is easily compatible with oil, and works to uniformly mix polar and nonpolar substances.
  • hydrophilic group that is easily compatible with water
  • hydrophobic group lipophilic group
  • the type of surfactant is not particularly limited, and ionic surfactants, nonionic surfactants, and the like can be used.
  • the nonionic surfactant may be a polyethylene glycol type nonionic surfactant or a polyhydric alcohol type nonionic surfactant.
  • Polyethylene glycol type nonionic surfactants have 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, and polypropylene glycol. It is a given nonionic surfactant.
  • the knitted fabric 6 can be subjected to an adhesion treatment for the purpose of improving the adhesion with the rubber composition constituting the compression layer 4 (the rubber composition forming the surface of the rib portion 2).
  • the adhesive treatment of the knitted fabric 6 include immersion treatment in a resin-based treatment solution in which an epoxy compound or an isocyanate compound is dissolved in an organic solvent (toluene, xylene, methyl ethyl ketone, etc.), resorcin-formalin-latex solution (RFL solution). ), An immersion treatment in a rubber paste obtained by dissolving a rubber composition in an organic solvent, and the like.
  • a friction treatment in which the knitted fabric 6 and the rubber composition are passed through a calender roll and the rubber composition is slid into the knitted fabric 6, and a spreading treatment in which rubber paste is applied to the knitted fabric 6.
  • a coating treatment or the like in which a rubber composition is laminated on the knitted fabric 6 can be employed.
  • the rubber is applied to the frictional transmission surface of the knitted fabric 6 (the surface contacting the drive pulley 21 and the driven pulley 22). It is preferable to prevent the composition from exuding. If the rubber composition oozes out from the knitted fabric 6 to the friction transmission surface side, the water absorption decreases, so the decrease in the coefficient of friction when wet is increased, and the water injection resistance is reduced. Accordingly, by eliminating the bleeding of the rubber composition on the frictional transmission surface of the knitted fabric 6, sufficient water absorption can be ensured, so that the water injection resistance can be improved.
  • FIG. 4A an unvulcanized stretch layer sheet 3S is wound around a cylindrical inner mold 52 having a flexible jacket 51 mounted on the outer peripheral surface, and a core wire is wound thereon. 5 is spun into a spiral shape, and an unvulcanized compressed layer sheet 4S and a knitted fabric 6 are sequentially wound (covered) thereon to form a molded body 10. Thereafter, the inner mold 52 around which the molded body 10 is wound is set concentrically on the inner circumferential side of the outer mold 53 in which a plurality of rib molds 53a are formed on the inner circumferential surface. At this time, a predetermined gap is provided between the inner peripheral surface of the outer mold 53 and the outer peripheral surface of the molded body 10.
  • the knitted fabric 6 when the V-ribbed belt 1 is formed, the knitted fabric 6 needs to be formed into a cylindrical shape so as to follow the outer periphery of the compressed layer sheet 4S. Therefore, there is a method of preparing a seamless knitted fabric without a joint using a circular knitting machine or the like. In that case, it is necessary to prepare a seamless knitted fabric corresponding to the length (circumferential length) of the V-ribbed belt 1. . At this time, if a knitted fabric that is too long (too large in circumference) is used with respect to the length of the V-ribbed belt 1, the knitted fabric may be overlapped and may overlap, resulting in a quality abnormality.
  • both ends of the rectangular knitted fabric 6 are jointed according to the length of the V-ribbed belt 1 to form a cylindrical shape. It is preferable to employ a method for producing the knitted fabric 6.
  • the knitted fabric 6 having the optimum circumferential length can be prepared (adjusted) regardless of the length of the V-ribbed belt 1, so that the quality is stabilized.
  • a flat knitting machine can be used in addition to the circular knitting machine, the degree of freedom is high, and there is no waste because only one type of work in progress is required.
  • a method of jointing both ends of the knitted fabric 6 a method of simultaneously welding the cut surfaces while cutting with a blade heated to a temperature near the melting point of the yarn constituting the knitted fabric 6 (hot melt, thermal welding), ultrasonic Examples thereof include a method of performing cutting and welding simultaneously (ultrasonic welding) by pressing with a vibrating blade, a sewing machine joint, overlock stitching, butting, and the like.
  • the timing of jointing the both ends of the knitted fabric 6 may be performed in advance before forming the V-ribbed belt 1 or may be performed during the forming of the V-ribbed belt 1 (for example, for the compressed layer wound around the inner mold 52).
  • the both ends of the knitted fabric 6 are jointed on the sheet 4S).
  • Hot melt, ultrasonic welding, sewing joint, and overlock stitching can be conveniently applied when performed before forming the V-ribbed belt 1, and butting can be conveniently applied when performed during the molding of the V-ribbed belt 1.
  • the joint location of the knitted fabric 6 may be one location or a plurality of locations. From the viewpoint of reducing the number of man-hours and improving the appearance, the joint location of the knitted fabric 6 is preferably one or two locations.
  • the flexible jacket 51 is expanded toward the inner peripheral surface of the outer mold 53 at a predetermined expansion rate (for example, 1 to 6%), so that the molded body 10
  • a predetermined expansion rate for example, 1 to 6%
  • the compression layer sheet 4S and the knitted fabric 6 are press-fitted into the rib mold 53a of the outer mold 53, and vulcanization (for example, 160 ° C., 30 minutes) is performed in that state.
  • the inner mold 52 is extracted from the outer mold 53, and the vulcanized rubber sleeve 10A having the plurality of rib portions 2 is removed from the outer mold 53, and then a cutter is used.
  • the vulcanized rubber sleeve 10A is cut into a predetermined width along the circumferential direction to finish the V-ribbed belt 1.
  • the manufacturing method of the V-ribbed belt 1 is not limited to the above method, and other known methods disclosed in, for example, Japanese Patent Application Laid-Open No. 2004-82702 can also be employed.
  • the knitted fabric 6 that covers the friction transmission surface side includes the cellulose-based natural spun yarn, so that the water absorption of the V-ribbed belt 1 can be increased and the water injection resistance can be improved.
  • the knitted fabric 6 includes a polyester-based composite yarn, so that the stretchability of the knitted fabric 6 is improved, and the V-shaped rib portion 2 is formed on the V-ribbed belt 1 with a mold (inner mold 52, outer mold 53). The adaptability of the knitted fabric 6 to the V-shaped rib portion 2 can be enhanced.
  • the knitted fabric 6 includes a polyamide-based yarn, it is possible to improve the wear resistance, to suppress the abrasion of the cellulose-based natural spun yarn, and to maintain the water-pouring sound-proof property over a long period of time. be able to.
  • the V-ribbed belt 1 is shaped like a V in the mold (inner mold 52, outer mold 53). In the manufacturing process of forming the rib portion 2, it is possible to make it difficult for the rib portion 2 to have a shape defect. Further, by making the knitted fabric 6 into a multilayer structure, the rubber component of the compression layer 4 is prevented from seeping out to the friction transmission surface via the knitted fabric 6, and the friction coefficient in the dry state of the friction transmission surface and the wet Since the difference from the friction coefficient in the state can be reduced, the water injection resistance can be improved.
  • V-ribbed belts according to Examples 1 to 5 and Comparative Examples 1 to 4 were produced, and rubber bleeding was observed for the presence or absence of rubber bleeding on the friction transmission surface.
  • a take-out observation test, a friction coefficient measurement test, a misalignment pronunciation evaluation test (measurement limit angle measurement), and an abrasion resistance test were performed.
  • Examples 1 to 5 are all weft multi-layer knitted fabrics of double Kanoko knitting, cotton yarn (50th spun yarn) as cellulosic natural spun yarn (A), and PTT / PET conjugate as polyester composite yarn (B).
  • Yarn manufactured by Toray Industries, Inc., 84 dtex
  • nylon filament yarn manufactured by Toray Industries, nylon 66, 110 dtex
  • C polyamide-based yarn
  • aramid filament yarn manufactured by Teijin Ltd., Technora, 110 dtex
  • Example 1 to 5 the PTT / PET conjugate yarn was knitted so as to be on the compression layer side, and the cotton yarn and polyamide yarn to be on the friction transmission surface side (side in contact with the pulley).
  • the ratio (mass ratio) of cotton yarn to polyamide-based yarn was changed to evaluate the influence on the water injection resistance and abrasion resistance.
  • Comparative Example 1 is a weft knitted multi-layer knitted fabric in which cotton yarn is used as cellulose-based natural spun yarn (A), PTT / PET conjugate yarn is used as polyester-based composite yarn (B), and polyamide yarn (C) is not included. is there.
  • Comparative Example 2 is a single layer weft knitted fabric made of cotton and polyurethane covering yarn.
  • Comparative Example 3 is a single layer weft knitted fabric made of nylon and polyurethane Taslan processed yarn.
  • Comparative Example 4 is a knitted fabric having the same configuration as that of Example 1, but by using the reverse side of Example 1, the PTT / PET conjugate yarn is used on the friction transmission surface side, and the cotton yarn is used on the compression layer side. And nylon filament yarn.
  • Rubber bleeding observation test In the rubber oozing observation test, a microscope was used to magnify the friction transmission surface of the V-ribbed belt 1 by 20 times, and the ratio of the area where the rubber was exposed to the friction transmission surface was calculated using image analysis software. From the average value measured at any five locations, rubber exudation is “none” when the area ratio of the rubber exposed to the friction transmission surface is less than 5%, and rubber exudation when the area ratio is 5% or more. Judged “Yes”.
  • the friction coefficient measurement test includes a drive pulley (Dr.) having a diameter of 121.6 mm, an idler pulley (IDL.1) having a diameter of 76.2 mm, and an idler pulley (IDL.2) having a diameter of 61.0 mm. , An idler pulley (IDL.3) having a diameter of 76.2 mm, an idler pulley (IDL.4) having a diameter of 77.0 mm, and a driven pulley (Dn.) Having a diameter of 121.6 mm were used.
  • the V-ribbed belt 1 was hung on.
  • the rotational speed of the drive pulley (Dr.) is 400 rpm and the driven pulley (Dn.) Under room temperature conditions (23 ° C.).
  • the belt winding angle ⁇ is set to ⁇ / 9 radians (20 °), a constant load (180 N / 6 rib) is applied and the V-ribbed belt 1 is run to increase the torque of the driven pulley (Dn.). From the torque value of the driven pulley (Dn.) When the sliding speed of the V-ribbed belt 1 with respect to the pulley (Dn.) Reaches the maximum (100% slip), the friction coefficient ⁇ was obtained using the equation (1).
  • T 1 is tight side tension
  • T 2 is slack side tension
  • a driven pulley (Dn.) Slack side tension T 2 of the inlet side is equal to the constant load (180N / 6rib), tight side tension T 1 of the delivery side, the tension due to the torque of the driven pulley (Dn.) This constant load Will be added.
  • the misalignment sound generation evaluation test includes a drive pulley (Dr.) having a diameter of 90 mm, an idler pulley (IDL.1) having a diameter of 70 mm, a misalignment pulley (W / P) having a diameter of 120 mm, and a diameter of 80 mm.
  • the V-ribbed belt 1 is hung on each pulley of the test machine, and under the room temperature condition (23 ° C.), the rotational speed of the drive pulley (Dr.) is 1000 rpm, the belt tension is 300 N / 6 rib, and the drive pulley (Dr .)) 5cc of water is periodically poured into the friction transmission surface of the V-ribbed belt 1 (approximately every 30 seconds), and the misalignment pulley (W / P) is moved to the near side with respect to the other pulleys.
  • the misalignment angle (sound generation limit angle) when the V-ribbed belt 1 is driven by misalignment and sound is generated near the entrance of the misalignment pulley (W / P) is shifted (gradually increasing the misalignment angle). Asked.
  • the sounding limit angle was similarly obtained in a dry state where water was not injected. It should be noted that the larger the sound generation limit angle, the better the sound resistance.
  • a driving pulley (Dr.) having a diameter of 120 mm, an idler pulley (IDL.1) having a diameter of 75 mm, a tension pulley (Ten.) Having a diameter of 60 mm, and a driven pulley having a diameter of 120 mm (Dn) .) was used in order.
  • the V-ribbed belt 1 is hung on each of these pulleys, and the rotational speed of the drive pulley (Dr.) is 4900 rpm under an atmosphere of 120 ° C., and an axial load of 890 N is applied to the tension pulley (Ten.) As an initial load.
  • the knitted fabric 6 includes a cellulose-based natural spun yarn (A), a polyester-based composite yarn (B), and a polyamide-based yarn (C), and the cellulose-based natural spun yarn (A) and the polyamide-based yarn (C).
  • A cellulose-based natural spun yarn
  • B polyester-based composite yarn
  • C polyamide-based yarn
  • the difference ⁇ between the friction coefficient in the dry state and the friction coefficient in the wet state is small, The water injection ability was high. Furthermore, the wear rate after 200 hours durability was low and the wear resistance was also excellent.
  • Example 1 Focusing on the influence of the weight ratio of cotton and nylon in the knitted fabric 6 on the water-sounding sounding resistance and wear resistance, the dry state was found in Examples 1, 2 and 4 where the weight ratio of nylon was between 20 and 55%.
  • Example 3 where the mass ratio of nylon was relatively low at 5%, the difference ⁇ between the friction coefficient in the dry state and the friction coefficient in the wet state was the smallest, but the wear resistance was relatively low.
  • Example 5 in which aramid was used as the polyamide-based yarn (C), the wear resistance was improved while maintaining the same water-sounding sounding resistance as in Example 1 in which nylon was used.
  • Comparative Example 1 not including the polyamide-based yarn (C)
  • the wear resistance was greatly reduced.
  • Comparative Example 2 using a cotton / polyurethane covering thread the water-bleeding sound resistance was low or the wear resistance was also low due to the rubber seeping out to the friction transmission surface.
  • Comparative Example 3 using the nylon / polyurethane taslan processed yarn has the same level of water-squeezing resistance as compared with Comparative Example 1 and Comparative Example 2, and the wear resistance was slightly improved. Also, the rubber oozes onto the friction transmission surface, which is insufficient for practical use.
  • the configuration of the knitted fabric itself is the same as in Example 1.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Knitting Of Fabric (AREA)
  • Laminated Bodies (AREA)

Abstract

La présente invention concerne une courroie striée dans laquelle une surface de transmission par frottement est formée à partir d'un tissu tricoté multicouche à mailles cueillies. Le tissu tricoté multicouche à mailles cueillies contient un filé naturel à base de cellulose, un fil composite à base de polyester et un fil à base de polyamide, au moins le filé naturel à base de cellulose et le fil à base de polyamide sont disposés dans une couche côté surface de transmission par frottement.
PCT/JP2018/019874 2017-05-24 2018-05-23 Courroie striée et procédé de fabrication correspondant WO2018216738A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
CA3064366A CA3064366C (fr) 2017-05-24 2018-05-23 Courroie striee et procede de fabrication correspondant
CN201880033319.0A CN110651137B (zh) 2017-05-24 2018-05-23 多楔带及其制造方法
EP18806498.4A EP3633232B1 (fr) 2017-05-24 2018-05-23 Courroie striée et procédé de fabrication correspondant
KR1020197034408A KR102239997B1 (ko) 2017-05-24 2018-05-23 V리브드 벨트 및 그의 제조 방법
US16/615,963 US11913522B2 (en) 2017-05-24 2018-05-23 V-ribbed belt and manufacturing method for same

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JP2017-102797 2017-05-24
JP2017102797 2017-05-24
JP2018-097341 2018-05-21
JP2018097341A JP6717877B2 (ja) 2017-05-24 2018-05-21 Ｖリブドベルト及びその製造方法

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EP3892452A4 (fr) * 2018-12-06 2022-10-26 Mitsuboshi Belting Ltd. Courroie de transmission de puissance par friction et son procédé de fabrication
US11913521B2 (en) 2018-12-06 2024-02-27 Mitsuboshi Belting Ltd. Power-transmitting friction belt and method for manufacturing same

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