WO2019013232A1 - Courroie hélicoïdale et engrenage de transmission à courroie - Google Patents

Courroie hélicoïdale et engrenage de transmission à courroie Download PDF

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Publication number
WO2019013232A1
WO2019013232A1 PCT/JP2018/026105 JP2018026105W WO2019013232A1 WO 2019013232 A1 WO2019013232 A1 WO 2019013232A1 JP 2018026105 W JP2018026105 W JP 2018026105W WO 2019013232 A1 WO2019013232 A1 WO 2019013232A1
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WO
WIPO (PCT)
Prior art keywords
belt
tooth
less
helical
pitch
Prior art date
Application number
PCT/JP2018/026105
Other languages
English (en)
Japanese (ja)
Inventor
弘晃 池上
吉田　正邦
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 JP2018121700A external-priority patent/JP6648198B2/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 US16/630,272 priority Critical patent/US11460090B2/en
Priority to EP18832375.2A priority patent/EP3653904B1/fr
Priority to KR1020207000453A priority patent/KR102289189B1/ko
Priority to CA3069294A priority patent/CA3069294C/fr
Priority to CN201880045726.3A priority patent/CN110869640B/zh
Publication of WO2019013232A1 publication Critical patent/WO2019013232A1/fr

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    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D1/00—Woven fabrics designed to make specified articles
    • D03D1/0094—Belts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D5/00—Power-assisted or power-driven steering
    • B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D5/00—Power-assisted or power-driven steering
    • B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
    • B62D5/0409—Electric motor acting on the steering column
    • B62D5/0412—Electric motor acting on the steering column the axes of motor and steering column being parallel
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
    • D03D15/50—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the properties of the yarns or threads
    • D03D15/56—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the properties of the yarns or threads elastic
    • 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
    • F16G1/00—Driving-belts
    • F16G1/04—Driving-belts made of fibrous material, e.g. textiles, whether rubber-covered or not
    • 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
    • F16G1/00—Driving-belts
    • F16G1/06—Driving-belts made of rubber
    • F16G1/08—Driving-belts 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
    • F16G1/00—Driving-belts
    • F16G1/06—Driving-belts made of rubber
    • F16G1/08—Driving-belts made of rubber with reinforcement bonded by the rubber
    • F16G1/10—Driving-belts made of rubber with reinforcement bonded by the rubber with textile reinforcement
    • 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
    • F16G1/00—Driving-belts
    • F16G1/28—Driving-belts 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
    • 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
    • F16H7/023—Gearings for conveying rotary motion by endless flexible members with belts; with V-belts with belts having a toothed contact surface or regularly spaced bosses or hollows for slipless or nearly slipless meshing with complementary profiled contact surface of a pulley
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2201/00—Cellulose-based fibres, e.g. vegetable fibres
    • D10B2201/01—Natural vegetable fibres
    • D10B2201/02—Cotton
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2331/00—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products
    • D10B2331/02—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyamides
    • D10B2331/021—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyamides aromatic polyamides, e.g. aramides
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2331/00—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products
    • 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]
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2331/00—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products
    • D10B2331/10—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyurethanes

Definitions

  • the present invention relates to a helical gear belt, and more particularly to a helical gear belt applied to a belt transmission driven by high load or high speed rotation, and a belt transmission.
  • Patent Document 1 and Patent Document 2 propose a technology for further reducing noise and vibration in a belt transmission driven by high load or high speed rotation using a helical belt. There is.
  • the tooth ridge angle ⁇ is set to a value that satisfies ⁇ 0.2 ⁇ 1 ⁇ W ⁇ tan ⁇ / Pt ⁇ 0.75.
  • the backlash (gap) between the teeth of the helical tooth belt and the teeth of the pulley is set to 1.6% to 3% of the tooth pitch Pt.
  • the tooth line angle ⁇ is 7 degrees or more and 10 degrees or less.
  • the ratio (100 ⁇ tb / hb) of the thickness tb to the tooth height hb is set to 120% or more and 240% or less.
  • the present invention can increase the rigidity without increasing the thickness of the helical belt, and can further reduce noise and vibration when used in a belt transmission driven by high load or high speed rotation. Intended to provide a belt.
  • One of the modes of the present invention is a back in which a core wire is embedded,
  • a helical tooth belt having a plurality of tooth portions provided on one surface of said back along the longitudinal direction of the belt at predetermined intervals and each inclined with respect to the belt width direction,
  • the surface of the teeth and a portion of the one surface of the back are made of a tooth cloth,
  • the tooth pitch of the plurality of teeth is 2 mm or more and less than 4 mm
  • the thickness of the back is 0.4 mm or more and 1.2 mm or less
  • the thickness of the back is 0.6 mm or more and 1.8 mm or less
  • the core wire is a twisted cord containing high-strength glass fiber or carbon fiber and having a diameter of 0.2 mm or more and 0.6 mm or less
  • each core wire pitch between the core wire and the core wire is 0.45
  • the surface on the tooth side of the back portion is reinforced by the tooth cloth, and the rigidity is enhanced.
  • the core wire embedded in the back is a twisted cord containing high strength glass fiber or carbon fiber which is a high strength (high elastic modulus) fiber material, and the diameter of the twisted cord is 0.2 mm or more. It is 6 mm or less. Therefore, the rigidity of the back can be further enhanced by the core wire while securing the flexibility of the back.
  • Vibration chord vibration
  • each core pitch between the cores is in the range of 0.45 mm or more and 0.6 mm or less.
  • the thickness of the back is 0.4 mm or more and 1.2 mm or less.
  • the thickness of the back is 0.6 mm or more and 1.8 mm or less.
  • the thicknesses of these are, for example, about the same as the thickness of the back of a conventional helical tooth belt used for a reduction gear of an electric power steering apparatus for automobiles.
  • the helical belt of the present invention can increase the rigidity of the back without increasing the thickness of the back. Therefore, vibration and noise can be further suppressed while securing sufficient bending fatigue resistance.
  • the above-mentioned core wire embedded in the above-mentioned back portion extends from one end to the other end of the helical belt in the belt width direction.
  • the core line pitch may be arranged to be a constant value in the range of 0.45 mm or more and 0.6 mm or less.
  • the rigidity of the helical tooth belt can be further enhanced without further increasing the thickness of the back or increasing the diameter of the core wire (without sacrificing flexibility). , Vibration and noise can be suppressed more.
  • the tooth height of the teeth when the tooth pitch of the plurality of teeth is 2 mm or more and less than 3 mm, the tooth height of the teeth is 0.7 mm or more 2 .0 mm or less, When the tooth pitch of the plurality of tooth portions is 3 mm or more and less than 4 mm, the tooth height of the tooth portions may be 1.0 mm or more and 2.3 mm or less.
  • the back may include a rubber component, and the rubber component may include an ethylene-propylene-diene terpolymer or a hydrogenated nitrile rubber.
  • the tooth cloth is made of a woven fabric including warp and weft, and the warp or weft is arranged to extend in the longitudinal direction of the belt.
  • the warp or weft disposed so as to extend in the longitudinal direction of the belt may include an elastic yarn having elasticity.
  • At least one fiber selected from the group consisting of nylon, aramid, polyester, polybenzoxazole, and cotton, which constitutes the tooth cloth May be included.
  • the other surface of the back is made of a backing cloth
  • the fibers constituting the back fabric may include at least one fiber selected from the group consisting of nylon, aramid, and polyester.
  • the other side of the back is made of the back cloth, and the fibers constituting the back cloth include at least one type of fiber selected from the group consisting of nylon, aramid, and polyester. It is further reinforced to increase its rigidity.
  • a belt elastic modulus of the helical belt may be 0.96 MPa or more per 1 mm of belt width.
  • a drive pulley rotationally driven by a drive source, Driven pulley, It may be a belt transmission provided with the above-mentioned helical tooth belt wound on the above-mentioned driving pulley and the above-mentioned driven pulley.
  • noise and vibration can be reduced in the belt transmission that transmits the driving force of the driving pulley to the driven pulley.
  • the rotational speed of the drive pulley may be 1000 rpm or more and 4000 rpm or less.
  • noise and vibration can be sufficiently reduced in the belt transmission driven at high speed.
  • the load of the driven pulley may be 0.5 kW or more and 3 kW or less.
  • noise and vibration can be sufficiently reduced in a belt drive driven at high load.
  • an outer diameter of the driven pulley is larger than an outer diameter of the drive pulley.
  • the belt transmission may be a reduction gear of an electric power steering apparatus for a car.
  • noise and vibration can be sufficiently reduced in the reduction gear of the electric power steering apparatus for a car.
  • a helical tooth belt capable of further reducing noise and vibration when it is used for a belt transmission driven by high load or high speed rotation without increasing the thickness of the helical tooth belt. it can.
  • FIG. 1 is a schematic view showing a schematic configuration of an electric power steering apparatus to which the helical belt of the present embodiment is applied.
  • FIG. 2 is a side view of the reduction gear of the electric power steering apparatus.
  • FIG. 3 is a partial perspective view of the helical tooth belt.
  • FIG. 4 is a view of the helical tooth belt as viewed from the inner peripheral side.
  • FIG. 5 is a cross-sectional view in the belt width direction of the helical tooth belt.
  • the helical belt 30 of this embodiment is used, for example, for the reduction gear 20 of the electric power steering apparatus 1 for a car shown in FIG.
  • the electric power steering (EPS) device 1 is connected to the steering shaft 3 connected to the steering wheel 2, the intermediate shaft 4 connected to the steering shaft 3, and the intermediate shaft 4 and interlocked with the rotation of the steering wheel 2. And a steering mechanism 5 for steering the wheels 9.
  • the steering mechanism 5 includes a pinion shaft 6 connected to the intermediate shaft 4 and a rack shaft 7 meshing with the pinion shaft 6.
  • the rack shaft 7 extends in the left-right direction of the vehicle.
  • a rack 7 a that meshes with a pinion 6 a provided on the pinion shaft 6 is formed in the middle of the rack shaft 7 in the axial direction.
  • the wheels 9 are connected to both ends of the rack shaft 7 via tie rods 8 and knuckle arms (not shown).
  • the rotation of the steering wheel 2 is transmitted to the pinion shaft 6 via the steering shaft 3 and the intermediate shaft 4.
  • the rotation of the pinion shaft 6 is converted into the axial movement of the rack shaft 7. Thereby, the wheel 9 is steered.
  • the electric power steering apparatus 1 can obtain a steering assist force according to the steering torque applied to the steering wheel 2.
  • the electric power steering apparatus 1 includes a torque sensor 13 for detecting a steering torque, a control device 14, an electric motor 15 (drive source) for steering assistance, and a driving force of the electric motor 15 as a steering mechanism 5. And a speed reduction gear 20 as a transmission gear.
  • the steering shaft 3 has an input shaft 10, a torsion bar 11 and an output shaft 12.
  • the torque sensor 13 detects the steering torque input to the steering wheel 2 based on the relative rotational displacement between the input shaft 10 and the output shaft 12.
  • the detection result of the torque sensor 13 is input to the control device 14.
  • the control device 14 controls the electric motor 15 based on the steering torque and the like detected by the torque sensor 13.
  • the reduction gear 20 has a drive pulley 21, a driven pulley 22, and a helical tooth belt 30 wound around the drive pulley 21 and the driven pulley 22.
  • the driven pulley 22 has an outer diameter larger than that of the drive pulley 21.
  • the drive pulley 21 is fixed to the rotation shaft of the electric motor 15.
  • the driven pulley 22 is fixed to the pinion shaft 6.
  • a plurality of helical teeth 21 a are formed on the outer peripheral surface of the drive pulley 21.
  • a plurality of helical teeth 22 a are formed on the outer peripheral surface of the driven pulley 22.
  • the rotational speed of the drive pulley 21 is, for example, 1000 rpm or more and 4000 rpm or less.
  • the load of the driven pulley 22 is, for example, 0.5 kW or more and 3 kW or less.
  • the control device 14 drives the electric motor 15.
  • the electric motor 15 rotates the drive pulley 21, the helical tooth belt 30 travels, and the driven pulley 22 and the pinion shaft 6 rotate.
  • the rotational force of the electric motor 15 is decelerated by the reduction gear 20 and transmitted to the pinion shaft 6.
  • the rotation of the steering wheel 2 is transmitted to the pinion shaft 6 via the steering shaft 3 and the intermediate shaft 4.
  • the rotation of the pinion shaft 6 is converted into the axial movement of the rack shaft 7, whereby the wheels 9 are steered.
  • the steering of the driver is assisted by the rotation of the pinion shaft 6 being assisted by the electric motor 15.
  • the configuration of the electric power steering apparatus 1 to which the helical tooth belt 30 of the present invention can be applied is not limited to the configuration shown in FIG.
  • the driven pulley 22 of the reduction gear 20 may be fixed to the intermediate shaft 4 or the steering shaft 3.
  • the driven pulley 22 of the reduction gear 20 may be coupled to the rack shaft 7 via the conversion mechanism.
  • the conversion mechanism is, for example, a ball screw mechanism or a bearing screw mechanism, and may convert the rotational force of the driven pulley 22 into a force in the axial direction of the rack shaft 7 and transmit it to the rack shaft 7.
  • the helical belt 30 has a back 31 in which a core wire 33 is embedded in a spiral along the longitudinal direction of the belt and an inner peripheral surface of the back 31 (corresponding to one surface of the back 31) And a plurality of teeth 32 provided at predetermined intervals along the longitudinal direction of the belt.
  • the plurality of teeth 32 are integrally formed on the inner peripheral surface of the back 31.
  • the teeth 32 extend obliquely with respect to the belt width direction.
  • the inner circumferential surface of the helical tooth belt 30, that is, the surface of the tooth portion 32 and a part of the inner circumferential surface of the back portion 31 are covered with a tooth cloth 35.
  • the outer peripheral surface of the back 31 (corresponding to the other surface of the back 31) is not covered with a cloth or the like, but may be covered with a back cloth.
  • the circumferential length of the helical belt 30 is, for example, 150 to 400 mm.
  • the numerical range represented by “X to Y” means X or more and Y or less.
  • the width W (see FIG. 4) of the helical belt 30 is, for example, 4 to 30 mm.
  • the tooth pitch P (see FIG. 3) of the tooth portion 32 is 2 mm or more and less than 4 mm.
  • the thickness tb (see FIG. 3) of the back 31 is 0.4 to 1.2 mm, preferably 0.6 mm or more and 0.9 mm or less.
  • the thickness tb of the back 31 is 0.6 to 1.8 mm, preferably 0.8 mm or more and 1.2 mm or less.
  • the tooth height hb (see FIG. 3) of the tooth portion 32 is, for example, 0.7 to 2.0 mm, preferably 0.8 mm or more and 1.0 mm or less is there.
  • the tooth height hb of the tooth portion 32 is, for example, 1.0 to 2.3 mm, preferably 1.1 mm or more and 2.0 mm or less.
  • the total thickness (maximum thickness) t see FIG.
  • the inclination angle ⁇ (see FIG. 4) of the teeth 32 with respect to the belt width direction is, for example, 2 to 7 °, preferably 2 to 6 °.
  • the back 31 and the teeth 32 are composed of a rubber composition, and as a rubber component of this rubber composition, chloroprene rubber (CR), nitrile rubber, hydrogenated nitrile rubber (HNBR), ethylene-propylene copolymer (EPM) And ethylene-propylene-diene terpolymer (EPDM), styrene-butadiene rubber, butyl rubber, chlorosulfonated polyethylene rubber and the like.
  • Particularly preferred rubber components are ethylene-propylene-diene terpolymers (EPDM), and chloroprene rubber and hydrogenated nitrile rubber (HNBR) are also suitably used.
  • the rubber composition which constitutes back part 31 and tooth part 32 is formed with the same rubber composition, it may be formed with different rubber compositions.
  • the rubber composition that constitutes the back 31 and the teeth 32 may contain various conventional additives (or compounding agents) as needed.
  • a vulcanizing agent or a crosslinking agent for example, oximes (such as quinone dioxime), guanidines (such as diphenyl guanidine), metal oxides (such as magnesium oxide and zinc oxide)), a vulcanization assistant, and a vulcanizing agent Vulcanization accelerator, vulcanization retarder, reinforcing agent (carbon black, silicon oxide such as hydrous silica), metal oxide (eg zinc oxide, magnesium oxide, calcium oxide, barium oxide, iron oxide, copper oxide, titanium oxide) , Aluminum oxide etc., fillers (clay, calcium carbonate, talc, mica etc.), plasticizers, softeners (oils such as paraffin oil, naphthenic oil etc.), processing agents or processing aids (stearic acid, stearin, etc) Acid metal salt, wax, paraffin etc., anti-aging agent (aromatic
  • sealant can be exemplified antistatic agent.
  • stabilizers antioxidants, ultraviolet absorbers, heat stabilizers, etc.
  • lubricants flame retardants, etc.
  • flame retardants etc.
  • additives can be used alone or in combination, and can be selected according to the type of rubber component, application, performance and the like.
  • the core wire 33 is spirally embedded in the back portion 31 at a predetermined interval (0.45 mm or more and 0.6 mm or less) in the belt width direction along the belt longitudinal direction. More specifically, as shown in FIG. 3 and FIG. 5, cords 33 spirally embedded cords 33 and 33 from one end to the other end in the belt width direction of spine 31.
  • Each core pitch SP which is the distance between the centers of may be arranged so as to have a constant value in the range of 0.45 mm or more and 0.6 mm or less.
  • the apparent number in a cross sectional view of the cords arranged at a predetermined cord pitch SP in the belt width direction is treated as "the number of cords". . That is, the number of spirals of the core wire 33 embedded in a spiral shape is taken as the “number of core wires”.
  • the core wire 33 which is disposed at one end and the other end of the spine 31 of the helical belt 30 and is not cut in a circular cross-sectional view is not included in the effective number and is not cut in a cross sectional view It is desirable to count the core wire 33 as an effective number.
  • the core wire 33 is embedded in a spiral shape, the arrangement of the core wire 33 differs depending on the portion where the cross section is collected among the endless helical tooth belts 30, which is cut.
  • each core pitch SP is constant in the range of 0.45 mm or more and 0.6 mm or less
  • the value obtained by dividing the belt width by the core wire pitch SP (a constant value in the range of 0.45 mm to 0.6 mm) and rounding off the decimal point value is roughly calculated. It is regarded as "the number of cores" (the number of effective lines). For example, if the belt width is 25 mm and the core wire pitch SP is 0.56 mm, the calculated value is 44.64, and the “number of core wires” (the number of effective wires) is regarded as 44.
  • the calculated value is 48.07, and the “number of cores” (the number of effective cores) is considered to be 48. Further, if the belt width is 25 mm and the core pitch SP is 0.60 mm, the calculated value is 41.67, and the “number of core wires” (the number of effective wires) is regarded as 41.
  • the core wire 33 is comprised by the twist cord formed by twisting a plurality of strands.
  • One strand may be formed by bundling filaments (long fibers) and aligning them.
  • the diameter of the core wire 33 is 0.2 to 0.6 mm.
  • the material of the filament is high strength glass fiber or carbon fiber. Both high strength glass fibers and carbon fibers have high strength and low elongation, and are suitable as a material of the core wire 33, but high strength glass fibers are more preferable from the viewpoint of low cost.
  • high-strength glass fibers for example, those having a tensile strength of 300 kg / cm 2 or more, particularly glass fibers having a composition shown in the following Table 1 having more Si components than alkali-free glass fibers (E glass fibers) are suitably used. it can.
  • the composition of E glass fiber is also described in Table 1 below for comparison.
  • K glass fiber As such high-strength glass fibers, K glass fiber, U glass fiber (both manufactured by Nippon Glass Fiber Co., Ltd.), T glass fiber (manufactured by Nitto Boseki Co., Ltd.), R glass fiber (manufactured by VETROTEX), S glass fiber, S glass fiber -2 Glass fiber, ZENTRON glass fiber (all manufactured by Owens Corning Fiberglass) and the like.
  • the carbon fiber examples include pitch-based carbon fiber, polyacrylonitrile (PAN) -based carbon fiber, phenol resin-based carbon fiber, cellulose-based carbon fiber, polyvinyl alcohol-based carbon fiber and the like.
  • PAN polyacrylonitrile
  • carbon fiber for example, Toray Industries, Inc. "Toreca (registered trademark)", Toho Tenax Corporation “Tenax (registered trademark)", Mitsubishi Chemical Corporation “Dialed (registered trademark)” Can be used.
  • These carbon fibers can be used alone or in combination of two or more.
  • pitch-based carbon fibers and PAN-based carbon fibers are preferable, and PAN-based carbon fibers are particularly preferable.
  • the twist cords used as the core wire 33 may be subjected to an adhesion treatment in order to improve the adhesion to the back 31.
  • an adhesion treatment for example, a method is employed in which a twist cord is dipped in a resorcinol-formalin-latex treatment solution (RFL treatment solution) and then dried by heating to form an adhesion layer uniformly on the surface.
  • the RFL treatment solution is a mixture of an initial condensation product of resorcin and formalin in a latex, and as the latex used here, chloroprene, styrene butadiene vinylpyridine terpolymer (VP latex), hydrogenation A nitrile, NBR, etc. are mentioned.
  • VP latex chloroprene, sty
  • the tooth cloth 35 is preferably made of a woven fabric in which warp yarns and weft yarns are longitudinally and transversely crossed according to a predetermined rule.
  • the weave of the woven fabric may be twill weave, satin weave, or the like.
  • the form of warp yarn and weft yarn is any of multifilament yarns in which filaments (long fibers) are aligned and twisted, monofilament yarn which is one long fiber, and spun yarn (spun yarn) in which short fibers are twisted together. May be When the warp or weft is a multifilament yarn or a spun yarn, it may be a mixed twist yarn or mixed yarn using a plurality of types of fibers.
  • the weft yarn preferably includes an elastic yarn having stretchability.
  • the elastic yarn for example, a material having stretchability such as spandex made of polyurethane, or a processed yarn obtained by stretching (for example, wooly processing, crimping and the like) of a fiber is used. Normally, elastic yarns are not used for warp yarns. Therefore, weaving is easy.
  • the tooth cloth 35 it is preferable to arrange the warp of the woven fabric in the belt width direction and the weft so as to extend in the belt longitudinal direction. Thereby, the stretchability of the tooth cloth 35 in the belt longitudinal direction can be secured.
  • the tooth cloth 35 may be arranged so that the weft of the woven fabric extends in the belt width direction and the warp extends in the belt longitudinal direction. In this case, an elastic yarn having stretchability may be used as a warp.
  • a material of the fiber which comprises the tooth cloth 35 nylon, an aramid, polyester, polybenzoxazole, cotton etc. can use either or these combination.
  • the woven fabric used as the tooth cloth 35 may be subjected to an adhesion treatment in order to improve the adhesion to the back 31 and the teeth 32.
  • an adhesion treatment a method is generally used in which a woven fabric is dipped in resorcinol-formalin-latex (RFL solution) and then dried by heating to form a bonding layer uniformly on the surface.
  • RFL solution resorcinol-formalin-latex
  • the rubber composition is dissolved in an organic solvent such as methyl ethyl ketone, toluene, xylene, etc. besides the method of treating the woven fabric with an RFL solution.
  • the outer peripheral surface of the back 31 (corresponding to the other surface of the back 31) is not covered by a cloth or the like, but may be covered by a back cloth 36.
  • the back fabric 36 is a knitted fabric knitted with knitting yarn, or a woven fabric in which warp and weft yarns are intertwined longitudinally and laterally according to a certain rule It is preferred to be configured.
  • a knitted fabric is a fabric having a structure in which one or more yarns form a mesh (loop), and the next yarn is hooked on the loop to continuously form a new loop. That is, in a knitted fabric, it is formed by making a loop without crossing yarns in a straight line.
  • the knitted fabric (or knitting of the knitted fabric) may be either weft knitting (or knitted fabric knitted by weft knitting) or warp knitting (or knitted fabric knit by warp knitting) It may be The shape of the knitted fabric is not limited to a flat shape, a cylindrical shape (round knitting), and the like, and either the front or back stitch of the knitted fabric may be the adhesion surface of the belt body.
  • weft knitting examples include plain knitting (tendon knitting), rubber knitting, deer knitting, smooth knitting, jacquard knitting and the like.
  • warp knitting or knitting structure of warp knitting
  • a single denby, a single cord, a tricot, a half tricot etc. are mentioned, for example.
  • the weave of the woven fabric may be any of plain weave, twill weave, satin weave, and the like. From the viewpoint of securing the bendability of the helical belt 30, in order to make it easy to bend in the longitudinal direction of the belt, it is preferable to make the weave configuration or the knitting configuration easy to stretch in the longitudinal direction of the belt. Therefore, it is preferable to use a woven fabric containing elastic yarn having stretchability as the weft, and arrange the warp of the woven fabric to extend in the belt width direction and the weft to extend in the belt longitudinal direction.
  • multifilament yarns in which filaments (long fibers) are aligned and twisted, single filament monofilament yarn, and short fibers are twisted
  • It may be any of the spun yarns (spun yarns).
  • the warp or weft is a multifilament yarn or a spun yarn, it may be a mixed twist yarn or mixed yarn using a plurality of types of fibers.
  • the fiber which comprises the back fabric 36 any one of nylon, an aramid, polyester etc., or these combination is employable.
  • the back portion 31 is further reinforced to increase the rigidity of the helical tooth belt 30.
  • the woven or knitted fabric used as the back fabric 36 may be subjected to an adhesion treatment to enhance the adhesion to the back 31.
  • an adhesion treatment as in the case of the tooth cloth 35, it is preferable to immerse the cloth in resorcinol-formalin-latex (RFL solution) and then heat and dry to form an adhesion layer uniformly on the surface.
  • RFL solution resorcinol-formalin-latex
  • the rubber composition is dissolved in an organic solvent such as methyl ethyl ketone, toluene, xylene, etc., in addition to a method of treating the cloth with an RFL solution after pretreatment with an epoxy or isocyanate compound without being limited thereto.
  • a method of impregnating and adhering the rubber composition by dipping the cloth in the rubber paste may be employed. These methods may be performed alone or in combination, and the order of treatment and the number of treatments are not particularly limited.
  • the back cloth 36 is a knitted cloth
  • the unvulcanized rubber sheet wound on the knitted cloth is impregnated in the knitted cloth in the heat and pressure step in the method of manufacturing the helical tooth belt 30 described later. Therefore, it is not necessary to carry out the adhesion process.
  • the elastic modulus of the belt in the longitudinal direction of the helical belt 30 is preferably 0.96 MPa or more per 1 mm of the belt width, and more preferably in the range of 0.96 MPa to 1.4 MPa.
  • the elastic modulus of the belt in the longitudinal direction of the helical belt 30 is preferably 0.96 MPa or more per 1 mm of the belt width, and more preferably in the range of 0.96 MPa to 1.4 MPa.
  • it is preferably 24 MPa or more, and more preferably in the range of 24 MPa to 35 MPa.
  • the vibration of the helical tooth belt 30 is The rigidity of the helical tooth belt can be secured such that sufficient quietness can be obtained by suppression.
  • the helical belt 30 is manufactured, for example, in the following procedure. First, a woven fabric which has been subjected to adhesion processing for forming the tooth cloth 35 is wound around a cylindrical mold (not shown) having a plurality of grooves corresponding to the plurality of teeth 32 of the helical tooth belt 30. Subsequently, the twisted cords constituting the core wire 33 are helically spun on the outer circumferential surface of the wound woven fabric. Furthermore, an unvulcanized rubber sheet for forming the back portion 31 and the tooth portion 32 is wound around the outer periphery side to form an unvulcanized belt molded body.
  • a rubber jacket that is a vapor blocking material is further covered on the outer side thereof.
  • the jacketed belt molded body and the cylindrical mold are housed inside the vulcanized can.
  • the belt molded body is heated and pressurized inside the vulcanized can to vulcanize the rubber sheet.
  • the rubber composition of the rubber sheet is pressed into the groove of the mold to form the teeth 32.
  • a plurality of helical belts 30 are obtained by cutting the demolded sleeve-like molded body into a predetermined width.
  • the surface of the back portion 31 on the side of the tooth portion 32 is reinforced by the tooth cloth 35, so that the rigidity is enhanced.
  • the core wire 33 embedded in the back portion 31 is a twisted cord containing high strength glass fiber or carbon fiber which is a high strength (high elastic modulus) fiber material, and the diameter of the twisted cord is 0.2 mm or more It is 0.6 mm or less. Therefore, the rigidity of the back 31 can be further enhanced by the core wire 33 while securing the bendability of the back 31.
  • each core pitch SP between the cores is in the range of 0.45 mm or more and 0.6 mm or less.
  • the thickness of the back 31 is 0.4 mm or more and 1.2 mm or less.
  • the thickness of the back 31 is 0.6 mm or more and 1.8 mm or less.
  • the thickness of these is, for example, about the same as the thickness of the back of the conventional helical tooth belt used for the reduction gear 20 of the electric power steering apparatus 1 for automobiles.
  • the helical belt 30 of the present invention can increase the rigidity of the back 31 without increasing the thickness of the back 31. Therefore, vibration and noise can be further suppressed while securing sufficient bending fatigue resistance.
  • the helical belt 30 for the reduction gear 20 of the electric power steering apparatus 1 for an automobile in which the outer diameter of the driven pulley 22 is larger than the outer diameter of the drive pulley 21, noise and vibration are sufficiently made. It can be reduced.
  • helical tooth belts according to Examples 1 to 17 and Comparative Examples 1 to 6 were manufactured, and measurement of a belt elastic modulus, a sound pressure measurement test, and a cold resistance test described later were performed.
  • twist cords of A1 to A4 having the configurations shown in Table 2 below were prepared.
  • the twist cord of A1 was created in the following procedure.
  • the glass fiber filaments of the designation KCG150 described in JIS R 3413 (2012) were bundled and aligned to form three strands.
  • the three strands are immersed in an RFL solution (18-23 ° C.) having a composition shown in Table 3 below for 3 seconds and then dried by heating at 200-280 ° C. for 3 minutes to uniformly adhere to the surface A layer was formed.
  • the three strands were pretwisted with 12 twists / 10 cm, no overtwisting was given, and a twist cord having a diameter of 0.35 mm was prepared by single twisting.
  • the twist cords of A2 and A3 were prepared in the same manner as A1, except that the glass fibers were changed to UCG150 and ECG150.
  • the twist cord of A4 is prepared in the same procedure as the core wire of A1 to A3 except that the used strand is one strand obtained by bundling and aligning carbon fiber filaments (3K), and the diameter is single-twisted. Is a 0.53 mm twisted cord.
  • the tooth cloth used for the helical tooth belts of Examples 1 to 17 and Comparative Examples 1 to 6 was one type.
  • As the tooth cloth twill woven fabric was used, and the warp yarn of the woven fabric was disposed in the belt width direction and the weft yarn was extended in the belt longitudinal direction.
  • As the weft of the woven fabric a multifilament yarn of fineness of 155 dtex of 66 nylon and a multifilament yarn of fineness of 122 dtex of spandex (polyurethane elastic fiber) were used.
  • the warp of the woven fabric was a 66 nylon multifilament yarn having a fineness of 155 dtex.
  • dtex decitex is what expressed the mass of the thread of 10000 meters in a gram unit.
  • the woven fabric used for tooth cloth is dipped in RFL solution (18-23 ° C) shown in Table 10 for 10 seconds and then dried by heating at 150-170 ° C for 3 minutes to uniformly adhere the adhesive layer on the surface. Were treated to form an adhesive.
  • An unvulcanized rubber sheet having a composition C1 shown in Table 4 below was prepared as an unvulcanized rubber sheet for forming the spine and the tooth portion of the helical tooth belts of Examples 1 to 17 and Comparative Examples 1 to 6.
  • the belt elastic modulus (tensile elastic modulus) was measured for the helical tooth belt (belt longitudinal direction) of Examples 1 to 17 and Comparative Examples 1 to 6. The method of measuring the belt elastic modulus will be described.
  • a pair of pulleys (30 teeth outer diameter 18.6 mm) were attached to the lower fixed part and upper load cell connection part of Autograph ("AGS-J10kN" manufactured by Shimadzu Corporation), and the helical tooth belt was hooked on the pulleys .
  • the upper pulley was then raised and stressed (about 10 N) to the extent that the helical belt did not loosen.
  • the helical belt 30 is wound around two pulleys, the distance between the shafts is adjusted so that the belt tension is 90 N, a load of 5 Nm is applied to the driven pulley 22, and the driving pulley 21 has a rotational speed of 1200 rpm.
  • the helical tooth belt 30 was run by rotating.
  • the ambient temperature was 23 ° C.
  • the sound pressure was measured with the sound collection microphone M of the sound level meter.
  • the sound collection microphone M was displayed on the deceleration apparatus shown in FIG.
  • the sound collection microphone M is a straight line A which passes through the center position S of the drive pulley 21 and is perpendicular to a straight line T passing the center position S of the drive pulley 21 and the center position K of the driven pulley 22.
  • Tables 5 to 8 show the measurement results measured by the sound collection microphone M. When the sound pressure was 63 dBA or less, it was evaluated as acceptable as a noise level that causes no problem in the helical tooth belt.
  • Rank B is a case where the crack did not occur at the 500th cycle and the crack occurred at the 1000th cycle.
  • Rank C is a case where a crack has occurred at the 500th cycle.
  • the crack life tends to reach crack life in the order of ranks B and C in comparison with rank A belt It is positioned as a grade that is less durable. From the viewpoint of appropriate use in cold regions where the lowest temperature reaches -40.degree. C., belts of ranks A and B are preferred, and belts of rank A are particularly preferably used.
  • Comparative Example 2 is a high strength glass fiber having a large elastic modulus of core, but the core pitch is large (0.64 mm), so it is not possible to secure a belt elastic modulus that can suppress vibration (less than 24 MPa ), The effect of reducing the sound pressure was not enough. Therefore, it can be judged that the lower limit of the elastic modulus (tensile elastic modulus in the longitudinal direction) of the belt having an effect of suppressing the vibration is 24 MPa (0.96 MPa per 1 mm of the belt width).
  • Comparative Example 1 is an example using the same configuration as that of Example 2 except for the material of the core wire, and using the core wire A3 of E glass fiber which is not high strength glass fiber, and the sound pressure is 64 dBA. Exceeded.
  • the comparative example 2 is an example which has the same configuration as the comparative example 1 except for the material of the core and the core pitch SP (0.64 mm) is larger than that of the comparative example 1. In this case, the sound pressure was larger than the determination criterion (pass at 63 dBA or less).
  • the sound pressure was 63 dBA or less, which is the criterion.
  • the second, third, and seventh embodiments have the same configuration as the first embodiment, and the core pitch is smaller (0.52 mm) than the first embodiment (0.56 mm), and the seventh embodiment is the sixth embodiment.
  • Example 3 is an example (0.60 mm) which is smaller than Example 2 (0.48 mm), and Example 3 is larger than Example 1, and Example 7 has the lowest sound among Examples 7, 2, 1 and 3. Pressure (58 dBA).
  • Example 4 differs from Example 2 only in the type of fibers constituting the cord (U glass), and Example 5 differs from Example 1 only in the type of fibers constituting the cord ( Carbon)
  • Example 8 differs from Example 3 only in the type of fibers constituting the cord (carbon). In Examples 4, 5 and 8, no significant difference was found in the sound pressure.
  • Example 9 (0.45 mm) in which the back thickness is smaller than Example 1 (back thickness 0.85 mm) since the rigidity of the helical tooth belt is small, the sound pressure is the acceptance criterion. It has increased to 63dBA.
  • Example 10 (1.15 mm) in which the back thickness was large, the sound pressure was reduced and the quietness was improved, but the cold resistance was lowered (judgment B).
  • Comparative Example 3 (1.30 mm) having a large back thickness, the sound pressure was further reduced, but the cold resistance was further reduced (judgment C). Overall, the back thickness (0.85 mm) of the well-balanced Example 1 was the best.
  • a fall of cold resistance is that it becomes easy to produce malfunctions, such as a crack, when it uses (bending driving
  • cold resistance for use in cold regions eg -40 ° C
  • the sound pressure increases and the quietness decreases as the back thickness decreases, but on the other hand, the stiffness of the helical tooth belt decreases (flexibility improves).
  • the cold resistance is improved, while the sound pressure is reduced and the quietness is improved if the back thickness is increased, but the cold resistance is lowered due to the increase in rigidity (flexibility) of the helical tooth belt.
  • the upper limit and the lower limit of the thickness of the back become important, and according to Examples 1, 9, 10 and Comparative Example 3, when the tooth pitch is 2 mm or more and less than 3 mm, the thickness of the back is 0.4 to 1 2 mm is preferable, and 0.6 mm to 0.9 mm is considered to be preferable.
  • Comparative Example 5 is a high strength glass fiber having a large elastic modulus of core, but since the core pitch is large (0.64 mm), the belt elastic modulus that can suppress vibration can not be secured (less than 24 MPa ), The effect of reducing the sound pressure was not enough. Therefore, it can be judged that the lower limit of the elastic modulus (tensile elastic modulus in the longitudinal direction) of the belt having an effect of suppressing the vibration is 24 MPa (0.96 MPa per 1 mm of the belt width).
  • Comparative Example 4 is an example using the core A3 of E glass fiber which is not the high strength glass fiber in the same configuration as Example 6 except for the material of the core, and the sound pressure is determined to be 66 dBA Exceeded.
  • the comparative example 5 is an example which has the same configuration as the comparative example 4 except for the material of the core and the core pitch SP (0.64 mm) is larger than that of the comparative example 4. In this case, the sound pressure was larger than the determination criterion (pass at 63 dBA or less).
  • the sound pressure was 63 dBA or less, which is the criterion.
  • the sixth, thirteenth, and eleventh embodiments have the same configuration as the twelfth embodiment, and the core pitch is smaller (0.52 mm) than the twelfth embodiment (0.56 mm), and the eleventh embodiment is the sixth embodiment.
  • Example 13 is an example (0.60 mm) larger than Example 12 (0.40 mm), and Example 11 has the lowest sound pressure (Example 11 and Example 11 to 13). It became 60dBA).
  • Example 14 differs from Example 12 only in the type of fibers constituting the core wire (carbon), and Example 15 differs from Example 13 only in the type of fibers constituting the core line (carbon ). In Examples 14 and 15, a large difference was not found in the sound pressure, but the sound pressure was as low as that in Example 11.
  • Example 16 (0.65 mm) in which the thickness of the back is smaller than Example 6 (back thickness 1.00 mm), the rigidity of the helical tooth belt is small and therefore the sound pressure is the acceptance criterion. It has increased to 63dBA.
  • Example 17 (1.75 mm) in which the back thickness was large, the sound pressure was reduced and the quietness was improved, but the cold resistance was lowered (judgment B).
  • Comparative Example 6 (1.90 mm) having a large back thickness, the sound pressure was further reduced, but the cold resistance was further reduced (judgment C). Overall, the back thickness (1.00 mm) of the well-balanced Example 6 was the best.
  • the thickness of the back is preferably 0.6 to 1.8 mm, 0.8 mm to 1.2 mm. Is considered preferable.
  • Electric Power Steering Device 15 Electric Motor (Drive Source) 20 Reduction gear (belt transmission) 21 drive pulley 22 driven pulley 30 helical tooth belt 31 back 32 tooth portion 33 center line 35 tooth cloth P tooth pitch SP center line pitch

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)

Abstract

La présente invention concerne une courroie hélicoïdale ayant une partie arrière dans laquelle un fil central est incorporé, et une pluralité de parties dents qui sont disposées sur une première surface de la partie arrière à intervalles prescrits le long d'une direction longitudinale de courroie et sont chacune inclinées par rapport à une direction de largeur de courroie, la courroie hélicoïdale étant caractérisée en ce que : les surfaces des parties dents et d'une partie de la première surface de la partie arrière sont configurées à partir de tissu de dent ; le pas de dent de la pluralité de parties dents est d'au moins 2 mm et inférieur à 4 mm ; lorsque le pas de dent de la pluralité de parties dents est d'au moins 2 mm et inférieur à 3 mm, l'épaisseur de la partie arrière est de 0,4 à 1,2 mm ; lorsque le pas de dent de la pluralité de parties dents est d'au moins 3 mm et inférieur à 4 mm, l'épaisseur de la partie arrière est de 0,6 à 1,8 mm ; le fil central est un câble torsadé contenant des fibres de verre ou des fibres de carbone à haute résistance, le diamètre du câble étant de 0,2 à 0,6 mm ; et le fil central est agencé de telle sorte que le pas de fil central entre deux parties du fil central est dans une plage de 0,45 à 0,6 mm.
PCT/JP2018/026105 2017-07-11 2018-07-10 Courroie hélicoïdale et engrenage de transmission à courroie WO2019013232A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US16/630,272 US11460090B2 (en) 2017-07-11 2018-07-10 Helical belt and belt transmission gear
EP18832375.2A EP3653904B1 (fr) 2017-07-11 2018-07-10 Courroie hélicoïdale et engrenage de transmission à courroie
KR1020207000453A KR102289189B1 (ko) 2017-07-11 2018-07-10 헬리컬 톱니벨트 및 전동장치
CA3069294A CA3069294C (fr) 2017-07-11 2018-07-10 Courroie helicoidale et engrenage de transmission a courroie
CN201880045726.3A CN110869640B (zh) 2017-07-11 2018-07-10 斜齿带及带传动装置

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JP2018-073854 2018-04-06
JP2018121700A JP6648198B2 (ja) 2017-07-11 2018-06-27 はす歯ベルトおよびベルト伝動装置
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CN115485488A (zh) * 2020-07-03 2022-12-16 阪东化学株式会社 传动带
EP4141286A4 (fr) * 2020-07-03 2023-10-25 Bando Chemical Industries, Ltd. Courroie de transmission

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DE102019212056A1 (de) * 2019-08-12 2021-02-18 Contitech Antriebssysteme Gmbh Schrägverzahnter Antriebsriemen
CN115485488A (zh) * 2020-07-03 2022-12-16 阪东化学株式会社 传动带
EP4141286A4 (fr) * 2020-07-03 2023-10-25 Bando Chemical Industries, Ltd. Courroie de transmission

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