WO2016031112A1 - Courroie de transmission et procédé de fabrication s'y rapportant - Google Patents

Courroie de transmission et procédé de fabrication s'y rapportant Download PDF

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Publication number
WO2016031112A1
WO2016031112A1 PCT/JP2015/003192 JP2015003192W WO2016031112A1 WO 2016031112 A1 WO2016031112 A1 WO 2016031112A1 JP 2015003192 W JP2015003192 W JP 2015003192W WO 2016031112 A1 WO2016031112 A1 WO 2016031112A1
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Prior art keywords
transmission belt
hollow particles
foaming agent
rubber
power transmission
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Application number
PCT/JP2015/003192
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English (en)
Japanese (ja)
Inventor
張　偉
貴幸 大久保
松川　浩和
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バンドー化学株式会社
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Application filed by バンドー化学株式会社 filed Critical バンドー化学株式会社
Priority to JP2016544911A priority Critical patent/JP6546595B2/ja
Publication of WO2016031112A1 publication Critical patent/WO2016031112A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D29/00—Producing belts or bands
    • 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
    • F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
    • F16G5/00—V-belts, i.e. belts of tapered cross-section
    • F16G5/20—V-belts, i.e. belts of tapered cross-section with a contact surface of special shape, e.g. toothed

Definitions

  • the present invention relates to a transmission belt and a manufacturing method thereof.
  • Patent Document 1 discloses an uncrosslinked rubber composition in which a surface layer on the side of forming a V rib of a V-ribbed belt is blended with hollow particles and / or a foaming agent for forming a concave hole on the surface of the V rib. Is composed of a rubber composition crosslinked by heating and pressing.
  • an uncrosslinked rubber composition in which a rubber component is blended with unexpanded hollow particles and a thermally decomposable foaming agent is heated and pressurized and crosslinked to form a plurality of recesses formed by expanding the hollow particles.
  • a method for producing a transmission belt in which a pulley contact portion is constituted by a rubber composition having holes exposed on the surface, wherein the decomposition temperature of the pyrolytic foaming agent is higher than the expansion start temperature of the hollow particles.
  • an uncrosslinked rubber composition in which a rubber component is blended with unexpanded hollow particles and a thermally decomposable foaming agent is heated and pressurized and crosslinked to form a plurality of recesses formed by expanding the hollow particles.
  • a transmission belt having a pulley contact portion made of a rubber composition with holes exposed on the surface, wherein an average pore diameter of the plurality of concave holes due to the hollow particles is 70 to 120 ⁇ m, and The hole diameter difference between the concave holes is 50 ⁇ m or less.
  • FIG. 3 is a perspective view of a V-ribbed belt according to Embodiment 1.
  • FIG. It is a cross-sectional enlarged view of a surface rubber layer. It is a longitudinal cross-sectional view of a belt forming die. It is a longitudinal cross-sectional enlarged view of a part of belt forming die.
  • FIG. 6 It is a figure which shows the pulley layout of the auxiliary machine drive belt transmission of a motor vehicle.
  • 6 is a perspective view of a V-ribbed belt according to Embodiment 2.
  • FIG. It is a figure which shows the pulley layout of the belt running test machine for abnormal noise evaluation at the time of flooding.
  • FIG. 1 shows a V-ribbed belt B (power transmission belt) according to the first embodiment.
  • the V-ribbed belt B according to the first embodiment is used, for example, in an auxiliary machine drive belt transmission provided in an engine room of an automobile.
  • the V-ribbed belt B according to Embodiment 1 has, for example, a belt circumferential length of 700 to 3000 mm, a belt width of 10 to 36 mm, and a belt thickness of 4.0 to 5.0 mm.
  • the V-ribbed belt B according to Embodiment 1 includes a V-ribbed belt main body 10 configured in a triple layer of a compression rubber layer 11 on the belt inner peripheral side, an intermediate adhesive rubber layer 12 and a back rubber layer 13 on the belt outer peripheral side.
  • a core wire 14 is embedded in the adhesive rubber layer 12 of the V-ribbed belt body 10 so as to form a spiral having a pitch in the belt width direction.
  • the compression rubber layer 11 is provided so that a plurality of V ribs 15 hang down to the inner peripheral side of the belt.
  • the plurality of V ribs 15 are each formed in a ridge having a substantially inverted triangular cross section extending in the belt length direction, and arranged in parallel in the belt width direction.
  • Each V-rib 15 has, for example, a rib height of 2.0 to 3.0 mm and a width between rib base ends of 1.0 to 3.6 mm.
  • the number of ribs is 3 to 6, for example (the number of ribs is 6 in FIG. 1).
  • the compression rubber layer 11 has a surface rubber layer 11a (pulley contact portion) provided in a layered manner along the entire pulley contact surface and an internal rubber layer 11b provided on the inner side of the belt with respect to the surface rubber layer 11a. .
  • the thickness of the surface rubber layer 11a is, for example, 50 to 500 ⁇ m.
  • the surface rubber layer 11a is a rubber composition obtained by heating and pressurizing and cross-linking an uncrosslinked rubber composition obtained by mixing and kneading a rubber compounding component containing unexpanded hollow particles and a pyrolytic foaming agent in a rubber component. Accordingly, a large number of hollow portions 16 having shells therein are formed, and the surface is constituted by a rubber composition in which a large number of concave holes 17 having shells are formed on the pulley contact surface.
  • the hollow portion 16 having the shell is formed by the expansion of the hollow particles, and the concave hole 17 having the shell is formed by opening the expanded hollow particles by breaking the shell on the surface. .
  • the decomposition temperature of a thermal decomposition type foaming agent is higher than the expansion
  • the surface rubber layer 11a composed of a rubber composition in which a non-crosslinked rubber composition in which a rubber component is blended with unexpanded hollow particles and a pyrolytic foaming agent is heated and pressurized, the hollow particles are formed. Since the decomposition temperature of the pyrolytic foaming agent is higher than the expansion start temperature of the surface, the average pore diameter due to the hollow particles is large on the surface of the surface rubber layer 11a as shown in FIG. Thus, a small concave hole 17 is formed.
  • the expansion start temperature is a temperature at which the unexpanded hollow particles start expanding at normal pressure (1 atm).
  • the decomposition temperature is a temperature at which the pyrolytic foaming agent starts to decompose at normal pressure (1 atm).
  • V-ribbed belts that run in the engine room to suppress the generation of slip noise when the belts are run under wet conditions. It has been.
  • a large number of concave holes 17 having a large average pore diameter due to the hollow particles are formed on the surface of the surface rubber layer 11a of the compressed rubber layer 11. Therefore, even when the belt travels in a wet condition, the water film on the pulley surface can be efficiently destroyed by the concave hole 17, thereby effectively suppressing the occurrence of slip noise.
  • Examples of the rubber component of the rubber composition constituting the surface rubber layer 11a include ethylene-propylene copolymer (EPR), ethylene-propylene-diene terpolymer (EPDM), ethylene-octene copolymer, ethylene-butene copolymer, and other ethylene- Examples include ⁇ -olefin elastomers; chloroprene rubber (CR); chlorosulfonated polyethylene rubber (CSM); hydrogenated acrylonitrile rubber (H-NBR). As the rubber component, one or more of these are preferably used, and an ethylene- ⁇ -olefin elastomer is more preferably used.
  • EPR ethylene-propylene copolymer
  • EPDM ethylene-propylene-diene terpolymer
  • ethylene-octene copolymer ethylene-butene copolymer
  • other ethylene- Examples include ⁇ -olefin elastomers; chloroprene rubber (CR); chloro
  • the rubber composition constituting the surface rubber layer 11a is formed by crosslinking an uncrosslinked rubber composition in which unexpanded hollow particles and a pyrolytic foaming agent are blended in a rubber component.
  • the particles include particles in which a solvent is enclosed in a shell formed of a thermoplastic polymer (for example, acrylonitrile-based polymer).
  • the hollow particles may be either a single species or a plurality of species.
  • the particle diameter of the unexpanded hollow particles is preferably 15 ⁇ m or more from the viewpoint of forming the concave holes 17 having a large average pore diameter due to the hollow particles suitable for suppressing the generation of abnormal noise due to slippage when wet on the surface of the surface rubber layer 11a.
  • the expansion start temperature of the hollow particles is preferably 140 ° C. or higher, from the viewpoint of forming the concave holes 17 having a large average pore diameter due to the hollow particles suitable for suppressing the generation of abnormal noise due to slippage at the time of water on the surface of the surface rubber layer 11a. More preferably, it is 150 degreeC or more, Preferably it is 180 degreeC or less, More preferably, it is 170 degreeC or less.
  • the amount of the hollow particles to be blended is 100 parts by mass of the rubber component. And preferably 0.5 parts by mass or more, more preferably 1.0 parts by mass or more, and preferably 10 parts by mass or less, more preferably 5.0 parts by mass or less.
  • Examples of commercially available hollow particles include Sekisui Chemical Co., Ltd. trade name: ADVANCEL EM403 (particle size 26 to 34 ⁇ m, expansion start temperature: 150 to 170 ° C.).
  • the rubber composition that constitutes the surface rubber layer 11a has a large number of hollow portions 16 formed by hollow particles expanded inside, and a large number of concave holes 17 that are opened by breaking the shell of the hollow particles on the surface. ing.
  • the average hole diameter of the concave holes 17 is preferably not less than 70 ⁇ m, more preferably not less than 80 ⁇ m, and more preferably not more than 120 ⁇ m, more preferably from the viewpoint that it is suitable for suppressing the generation of abnormal noise due to slippage when wet. Is 110 ⁇ m or less.
  • the difference between the maximum value and the minimum value of the hole diameter of the concave hole 17, that is, the hole diameter difference is an indicator of the variation in the hole diameter of the concave hole 17, but is preferably 50 ⁇ m or less, more preferably 40 ⁇ m or less.
  • the hole diameter of the concave hole 17 is an opening diameter of the concave hole 17 exposed on the surface of the surface rubber layer 11a
  • the average hole diameter is the number of arbitrary 50 to 100 hole diameters measured from the surface image.
  • the pore diameter difference can be obtained as an average, and the pore diameter difference can be obtained as a difference between the maximum value and the minimum value of arbitrary 50 to 100 pore diameters measured from the surface image.
  • thermally decomposable foaming agent blended in the uncrosslinked rubber composition examples include, for example, an ADCA foaming agent mainly composed of azodicarbonamide, a DPT foaming agent mainly composed of dinitrosopentamethylenetetramine, p, p
  • organic foaming agents such as an OBSH foaming agent mainly composed of '-oxybisbenzenesulfonylhydrazide and an HDCA foaming agent mainly composed of hydrazodicarbonamide.
  • these pyrolytic foaming agents are preferably used, and ADCA foaming agents are more preferably used.
  • the Sankyo Kasei Co., Ltd. brand name: Cell microphone series etc. are mentioned, for example.
  • the decomposition temperature of the pyrolytic foaming agent is higher than the expansion start temperature of the hollow particles, specifically, the average of the hollow particles suitable for suppressing the generation of abnormal noise due to slip on the surface of the surface rubber layer 11a.
  • the concave hole 17 having a large hole diameter it is preferably 150 ° C. or higher, more preferably 160 ° C. or higher, and preferably 230 ° C. or lower, more preferably 210 ° C. or lower.
  • the temperature difference between the expansion start temperature of the hollow particles and the decomposition temperature of the thermal decomposition type foaming agent forms a concave hole 17 having a large average hole diameter suitable for suppressing the generation of abnormal noise due to slippage when the water is wet on the surface of the surface rubber layer 11a.
  • it is preferably 10 ° C. or higher, more preferably 20 ° C. or higher, still more preferably 35 ° C. or higher, and preferably 80 ° C. or lower, more preferably 60 ° C. or lower.
  • the compounding amount of the pyrolytic foaming agent is 100 masses of the rubber component from the viewpoint of forming the concave holes 17 having a large average pore diameter due to the hollow particles suitable for suppressing the generation of abnormal noise due to slippage at the time of water on the surface of the surface rubber layer 11a.
  • the amount is preferably 0.5 parts by mass or more, more preferably 4 parts by mass or more, and preferably 10 parts by mass or less, more preferably 7 parts by mass or less.
  • the blending amount of the pyrolytic foaming agent with respect to 100 parts by weight of the rubber component is preferably larger than the blending amount of unexpanded hollow particles with respect to 100 parts by weight of the rubber component.
  • Mass ratio of blended amount of unexpanded hollow particles to 100 parts by weight of rubber component of rubber component of pyrolytic foaming agent to blended amount of 100 parts by weight of rubber component is from the viewpoint of forming the concave holes 17 having a large average pore diameter due to the hollow particles suitable for suppressing the generation of abnormal noise due to slippage at the time of water on the surface rubber layer 11a.
  • the rubber composition constituting the surface rubber layer 11a has a large number of hollow portions 18 that do not have a shell formed therein by foaming of a pyrolytic foaming agent, and a large number that does not have a shell formed on the surface.
  • the recessed hole 19 is exposed.
  • the difference between the maximum value and the minimum value of the hole diameter of the concave hole 19, that is, the hole diameter difference is larger than the hole diameter difference of the concave hole 17 formed by the hollow particles, and therefore, the variation in the hole diameter is large.
  • the hole diameter of the concave hole 19 having no shell is the opening diameter exposed on the surface of the surface rubber layer 11a.
  • the rubber composition constituting the surface rubber layer 11a includes a decomposition residue after the thermal decomposition type foaming agent is decomposed and foamed.
  • a decomposition residue after the thermal decomposition type foaming agent is decomposed and foamed.
  • urazole biurea cyanurate is included as a decomposition residue in the rubber composition constituting the surface rubber layer 11a.
  • hexamethylenetetramine is contained as a decomposition residue in the rubber composition constituting the surface rubber layer 11a.
  • the rubber composition constituting the surface rubber layer 11a contains polydithiophenyl ether and polythiophenylbenzenesulfonyl ether as decomposition residues.
  • the rubber composition constituting the surface rubber layer 11a contains urazole as a decomposition residue.
  • Examples of other rubber compounding agents blended in the rubber composition constituting the surface rubber layer 11a include reinforcing materials such as carbon black, oil, processing aids, vulcanization aids, crosslinking agents, vulcanization accelerators, and the like. Is mentioned. Short fibers may be blended in the rubber composition constituting the surface rubber layer 11a.
  • the rubber composition constituting the surface rubber layer 11a may be a sulfur-crosslinked rubber composition in which sulfur is used as a crosslinking agent, or an organic peroxide crosslinked system in which an organic peroxide is used as a crosslinking agent. Either a rubber composition or a combined cross-linked rubber composition using them in combination may be used.
  • the inner rubber layer 11b is composed of a rubber composition in which an uncrosslinked rubber composition obtained by mixing and kneading a rubber compounding agent with a rubber component is heated and pressurized and crosslinked.
  • the rubber component of the rubber composition constituting the inner rubber layer 11b for example, an ethylene- ⁇ -olefin elastomer and the like can be cited as in the case of the surface rubber layer 11a.
  • the rubber component of the rubber composition constituting the inner rubber layer 11b is preferably the same as the rubber component of the rubber composition constituting the surface rubber layer 11a.
  • a rubber compounding agent compounded in the rubber composition constituting the internal rubber layer 11b for example, as in the case of the surface rubber layer 11a, for example, a reinforcing material such as carbon black, a softening agent, a processing aid, a vulcanizing aid, Examples thereof include a crosslinking agent, a vulcanization accelerator, a rubber compounding resin, and an antioxidant.
  • the uncrosslinked rubber composition before crosslinking of the rubber composition constituting the inner rubber layer 11b is preferably not blended with unexpanded hollow particles and a pyrolytic foaming agent. That is, the rubber composition constituting the inner rubber layer 11b is preferably solid.
  • the rubber composition constituting the inner rubber layer 11b may be a sulfur-crosslinked rubber composition in which sulfur is used as a crosslinking agent, or an organic peroxide crosslinked system in which an organic peroxide is used as a crosslinking agent. Either a rubber composition or a combined cross-linked rubber composition using them in combination may be used.
  • the cross-linking system of the inner rubber layer 11b may be the same as or different from the cross-linking system of the surface rubber layer 11a.
  • the adhesive rubber layer 12 is formed in a band shape having a horizontally long cross section and has a thickness of, for example, 1.0 to 2.5 mm.
  • the back rubber layer 13 is also formed in a band shape having a horizontally long cross section and has a thickness of, for example, 0.4 to 0.8 mm.
  • the surface of the back rubber layer 13 is preferably formed in a form in which the texture of the woven fabric is transferred from the viewpoint of suppressing the sound generated between the back rubber layer 13 and the flat pulley in contact with the belt back surface.
  • Each of the adhesive rubber layer 12 and the back rubber layer 13 is composed of a rubber composition obtained by heating and pressurizing and crosslinking a non-crosslinked rubber composition obtained by mixing a rubber compounding agent with a rubber component and kneading.
  • Examples of the rubber component of the rubber composition constituting the adhesive rubber layer 12 and the back rubber layer 13 include, for example, ethylene- ⁇ -olefin elastomers as in the case of the surface rubber layer 11a.
  • the rubber component of the rubber composition constituting the adhesive rubber layer 12 and the back rubber layer 13 is preferably the same as the rubber component of the rubber composition constituting the surface rubber layer 11a and / or the internal rubber layer 11b.
  • a rubber compounding agent compounded in the rubber composition constituting the adhesive rubber layer 12 and the back rubber layer 13 for example, a reinforcing material such as carbon black, a softening agent, a processing aid, as in the case of the surface rubber layer 11a
  • a reinforcing material such as carbon black, a softening agent, a processing aid, as in the case of the surface rubber layer 11a
  • examples include vulcanization aids, crosslinking agents, vulcanization accelerators, rubber compounding resins, anti-aging agents, and the like.
  • the uncrosslinked rubber composition before crosslinking of the rubber composition constituting the adhesive rubber layer 12 and the back rubber layer 13 is preferably not blended with unexpanded hollow particles and a pyrolytic foaming agent. That is, it is preferable that the rubber composition constituting the adhesive rubber layer 12 and the back rubber layer 13 is solid.
  • Short fibers may be blended in the rubber composition constituting the adhesive rubber layer 12 and the back rubber layer 13.
  • the rubber composition constituting the adhesive rubber layer 12 and the back rubber layer 13 may be a sulfur-crosslinked rubber composition in which sulfur is used as a crosslinking agent, or an organic material in which an organic peroxide is used as a crosslinking agent. Either a peroxide cross-linked rubber composition or a combined cross-linked rubber composition using them in combination may be used.
  • the crosslinking system of the adhesive rubber layer 12 and the back rubber layer 13 may be the same as or different from the crosslinking system of the surface rubber layer 11a and / or the internal rubber layer 11b.
  • the inner rubber layer 11b, the adhesive rubber layer 12, and the back rubber layer 13 of the compressed rubber layer 11 are formed of a rubber composition of a different composition or a rubber composition of the same composition, either will do.
  • the core wire 14 is composed of twisted yarns such as polyester fiber (PET), polyethylene naphthalate fiber (PEN), aramid fiber, vinylon fiber and the like.
  • PET polyester fiber
  • PEN polyethylene naphthalate fiber
  • aramid fiber vinylon fiber and the like.
  • the core 14 is subjected to an adhesive treatment that is heated after being immersed in an RFL aqueous solution before forming and / or an adhesive treatment that is dried after being immersed in rubber paste in order to impart adhesion to the V-ribbed belt body 10. It has been subjected.
  • a belt forming die 20 including a cylindrical inner die 21 and an outer die 22 provided concentrically is used.
  • the inner mold 21 is formed of a flexible material such as rubber.
  • the outer mold 22 is made of a rigid material such as metal.
  • the inner peripheral surface of the outer mold 22 is formed as a molding surface, and V rib forming grooves 23 are provided on the inner peripheral surface of the outer mold 22 at a constant pitch in the axial direction.
  • the outer mold 22 is provided with a temperature control mechanism that controls the temperature by circulating a heat medium such as water vapor or a coolant such as water.
  • the belt mold 20 is provided with a pressurizing means for pressurizing and expanding the inner mold 21 from the inside.
  • each rubber compounding agent is blended with the rubber component and kneaded by a kneader such as a kneader or a Banbury mixer, and the obtained uncrosslinked rubber composition is formed by calendar molding or the like.
  • the uncrosslinked rubber sheets 11a ′ and 11b ′ for the surface rubber layer and the internal rubber layer of the compressed rubber layer 11 are produced by forming into a sheet shape.
  • uncrosslinked rubber sheets 12 'and 13' for the adhesive rubber layer and the back rubber layer are also produced.
  • an adhesive treatment is performed in which the twisted wire 14 ′ for the core wire is immersed in an RFL aqueous solution and heated, and thereafter, an adhesive treatment is performed in which the strand 14 d is immersed in rubber paste and dried by heating.
  • the rubber component is blended with unexpanded hollow particles 16' and a pyrolytic foaming agent.
  • a rubber sleeve 25 is placed on a cylindrical drum 24 having a smooth surface, and an uncrosslinked rubber sheet 13 ′ for the back rubber layer and an uncrosslinked rubber sheet for the adhesive rubber layer are placed thereon. 12 ′ are wound in order and laminated, and then a strand 14 ′ for a core wire is spirally wound around the cylindrical inner mold 21, and further, an uncrosslinked rubber sheet 12 ′ for an adhesive rubber layer is further formed thereon.
  • the uncrosslinked rubber sheet 11b ′ for the inner rubber layer in the compressed rubber layer 11 and the uncrosslinked rubber sheet 11a ′ for the surface rubber layer are wound in order to form the laminate 10 ′.
  • the rubber sleeve 25 provided with the laminated body 10 ′ is removed from the cylindrical drum 24, and as shown in FIG. 6, it is set in an fitted state on the inner peripheral surface side of the outer mold 22.
  • the inner mold 21 is positioned and sealed in the rubber sleeve 25 set on the outer mold 22.
  • the outer mold 22 is heated, and high-pressure air or the like is injected into the sealed interior of the inner mold 21 to pressurize it.
  • the inner mold 21 expands, and the laminate 10 ′ is pressed against the molding surface of the outer mold 22.
  • the uncrosslinked rubber sheets 11a ', 11b', 12 ', and 13' are heated and pressurized and cross-linked and integrated, and a cylindrical belt slab S that is combined with the twisted yarn 14 'is molded.
  • the uncrosslinked rubber sheet 11a ′ for the surface rubber layer forms a large number of hollow portions 16 having shells inside due to expansion of the hollow particles 16 ′, and the shell of the hollow particles 16 ′ is broken on the surface.
  • the molding temperature of the belt slab S is, for example, 100 to 180 ° C.
  • the molding pressure is, for example, 0.5 to 2.0 MPa
  • the molding time is, for example, 10 to 60 minutes.
  • the surface of the surface rubber layer 11a constituting the pulley contact portion has a large average pore diameter due to the hollow particles and a small variation in the pore diameter.
  • a concave hole 17 is formed. This is because, since the decomposition temperature of the pyrolytic foaming agent is higher than the expansion start temperature of the hollow particle 16 ′, the hollow particle 16 ′ first expands, and then the pyrolytic foaming agent decomposes and foams. Therefore, it is considered that the foaming gas by the pyrolytic foaming agent is introduced into the expanded hollow particles 16 ′, and as a result, the expansion of any hollow particles 16 ′ is promoted.
  • the expansion of the hollow particles 16 ′ is restricted, and it is difficult to sufficiently expand the hollow particles 16 ′.
  • the expansion of the hollow particles 16 ′ is promoted by the decomposition and foaming of the pyrolytic foaming agent.
  • the hollow particles 16 ′ can be expanded sufficiently large even under. From this point of view, the effect of expansion promotion of the hollow particles 16 ′ can be remarkably obtained when the molding pressure is 0.7 MPa or more, particularly 0.9 MPa or more.
  • the foaming gas produced by the pyrolytic foaming agent is, for example, nitrogen for ADCA foaming agents, nitrogen, carbon monoxide and carbon dioxide for DPT foaming agents, nitrogen and water vapor for OBSH foaming agents, and HDCA foaming agents. Nitrogen and ammonia.
  • the inside of the inner mold 21 is decompressed to release the seal, the belt slab S molded between the inner mold 21 and the outer mold 22 is taken out via the rubber sleeve 25, and the belt slab S is cut into a predetermined width.
  • the V-ribbed belt B is obtained by turning the front and back. If necessary, the outer peripheral side of the belt slab S, that is, the surface on the V rib 15 side may be polished.
  • FIG. 9 shows a pulley layout of the auxiliary drive belt transmission device 30 for an automobile using the V-ribbed belt B according to the first embodiment.
  • This accessory drive belt transmission device 30 is of a serpentine drive type in which a V-ribbed belt B is wound around six pulleys, four rib pulleys and two flat pulleys, to transmit power.
  • the auxiliary drive belt transmission device 30 is provided with a power steering pulley 31 of a rib pulley at the uppermost position, and an AC generator pulley 32 of a rib pulley is provided below the power steering pulley 31.
  • a flat pulley tensioner pulley 33 is provided at the lower left of the power steering pulley 31, and a flat pulley water pump pulley 34 is provided below the tensioner pulley 33.
  • a ribshaft crankshaft pulley 35 is provided on the lower left side of the tensioner pulley 33, and a rib pulley air conditioner pulley 36 is provided on the lower right side of the crankshaft pulley 35.
  • These pulleys are made of, for example, a metal stamped product, a molded product such as a casting, nylon resin, or phenol resin, and have a pulley diameter of 50 to 150 mm.
  • the V-ribbed belt B is wound around the power steering pulley 31 so that the V-rib 15 side contacts, and then wound around the tensioner pulley 33 so that the back surface of the belt contacts. After that, it is wound around the crankshaft pulley 35 and the air conditioner pulley 36 in order so that the V rib 15 side comes into contact, and further wound around the water pump pulley 34 so that the back surface of the belt comes into contact. Thus, it is wound around the AC generator pulley 32 and finally returned to the power steering pulley 31.
  • the belt span length which is the length of the V-ribbed belt B spanned between the pulleys, is, for example, 50 to 300 mm. Misalignment that can occur between pulleys is 0-2 °.
  • FIG. 10 shows a V-ribbed belt B (power transmission belt) according to the second embodiment.
  • the part of the same name as Embodiment 1 is shown using the same code
  • FIG. 10 shows a V-ribbed belt B (power transmission belt) according to the second embodiment.
  • the part of the same name as Embodiment 1 is shown using the same code
  • the compressed rubber layer 11 is composed of the same rubber composition as the surface rubber layer 11a in the V-ribbed belt B according to the first embodiment. That is, the compressed rubber layer 11 is a rubber composition in which an uncrosslinked rubber composition obtained by mixing and kneading a rubber compounding agent containing unexpanded hollow particles and a pyrolytic foaming agent in a rubber component is heated and pressurized and crosslinked.
  • an uncrosslinked rubber sheet for the compressed rubber layer unexpanded hollow particles for the surface rubber layer in the V-ribbed belt B according to the first embodiment and pyrolytic foaming
  • An uncrosslinked rubber sheet similar to the uncrosslinked rubber sheet containing the agent may be used.
  • the V-ribbed belt B is shown as the friction transmission belt, but it is not particularly limited to this, and a low-edge type V-belt or the like may be used.
  • the V-ribbed belt main body 10 is configured by the compressed rubber layer 11, the adhesive rubber layer 12, and the back rubber layer 13.
  • the present invention is not particularly limited thereto, and the compressed rubber layer 11 is not limited thereto.
  • the V-ribbed belt main body 10 is constituted by the adhesive rubber layer 12, and is constituted by a woven fabric, a knitted fabric, a non-woven fabric or the like formed of, for example, cotton, polyamide fiber, polyester fiber, aramid fiber or the like instead of the back rubber layer 13. It may be provided with a reinforcing cloth.
  • the auxiliary drive belt transmission device 20 of an automobile is shown as a belt transmission device, the belt transmission device is not particularly limited to this, and may be a belt transmission device for general industries.
  • Rubber composition The uncrosslinked rubber compositions of Examples 1 to 3 and Comparative Examples 1 and 2 below were prepared. Each configuration is also shown in Table 1.
  • EPDM (trade name: EP22 manufactured by JSR) as a rubber component is put into a chamber of a closed Banbury mixer and masticated, and then carbon black (product manufactured by Tokai Carbon Co., Ltd.) is added to 100 parts by mass of the rubber component.
  • a master batch was prepared by charging and kneading 5 parts by mass of trade name: zinc oxide (3 types).
  • the master batch After cooling the master batch to room temperature, the master batch is put into a sealed banbury mixer chamber and kneaded again, and there is sulfur (100 parts by mass of rubber component) : Seimi OT) 1.7 parts by mass, vulcanization accelerator (trade name: MSA, manufactured by Ouchi Shinsei Chemical Co., Ltd.), hollow particles (trade name: Advancel EM403, expansion start temperature Ta: 150 by Sekisui Chemical Co., Ltd.) ⁇ 170 ° C) 2.3 parts by mass and thermal decomposition type foaming agent 1 (manufactured by Sankyo Kasei Co., Ltd., trade name: Cellmic CE, ADCA-based foaming agent, decomposition temperature Tb: 208 ° C) 6.9 parts by mass are charged and mixed.
  • the uncrosslinked rubber composition kneaded was released when the temperature in the chamber reached 110 ° C.
  • the uncrosslinked rubber composition was designated as Example 1.
  • Example 1 the temperature difference (Tb-Ta) between the expansion start temperature of the hollow particles and the decomposition temperature of the pyrolytic foaming agent 1 is 38 to 58 ° C., and the blending amount of the hollow particles having the blending amount of the pyrolytic foaming agent is used.
  • the mass ratio to the amount is 3.0.
  • Example 2 Except that the blending amounts of the hollow particles and the pyrolyzable foaming agent 1 were 1.2 parts by mass and 8.7 parts by mass, respectively, with respect to 100 parts by mass of the rubber component, the same composition as in Example 1 The crosslinked rubber composition was designated as Example 2.
  • the temperature difference (Tb-Ta) between the expansion start temperature of the hollow particles and the decomposition temperature of the pyrolytic foaming agent 1 is 38 to 58 ° C., and the blending amount of the hollow particles in the blending amount of the pyrolytic foaming agent is used.
  • the mass ratio to the quantity is 7.3.
  • Example 3 The blended amount of the hollow particles is 3.5 parts by mass with respect to 100 parts by mass of the rubber component, and instead of the pyrolyzable foaming agent 1, a pyrolyzable foaming agent 2 (trade name: Cellmic A DPT foaming manufactured by Sankyo Kasei Co., Ltd.) An uncrosslinked rubber composition having the same structure as Example 1 was used in Example 3, except that 4.1 parts by mass of the agent decomposition temperature Tb: 205 ° C. was added to 100 parts by mass of the rubber component.
  • Example 3 the temperature difference (Tb-Ta) between the expansion start temperature of the hollow particles and the decomposition temperature of the pyrolytic foaming agent 2 is 35 to 55 ° C., and the blending amount of the hollow particles in the blending amount of the pyrolytic foaming agent is used.
  • the mass ratio to the quantity is 1.2.
  • Example 1 An uncrosslinked rubber composition having the same configuration as that of Example 1 was compared except that the pyrolytic foaming agent 1 was not blended and the blended amount of the hollow particles was 10 parts by mass with respect to 100 parts by mass of the rubber component. It was set to 1.
  • Example 2 A non-crosslinked rubber composition having the same configuration as that of Example 1 was compared except that the hollow particles were not blended and the blending amount of the pyrolyzable foaming agent 1 was 10 parts by mass with respect to 100 parts by mass of the rubber component. 2.
  • Example 1 the surface morphology of the test piece was observed with a microscope (Model: VHX-2000, manufactured by Keyence Corporation) at a magnification of 200 times.
  • a concave hole having a shell made of hollow particles was observed.
  • Comparative Example 2 with respect to the concave holes that do not have a shell made of the pyrolytic foaming agent, arbitrary 100 hole diameters were measured, and the number average thereof was taken as the average hole diameter.
  • FIG. 11 shows a pulley layout of the belt running test machine 40 for evaluating abnormal noise when wet.
  • the belt running test machine 40 for evaluating abnormal noise when wet is provided with a drive pulley 41 that is a rib pulley having a pulley diameter of 140 mm, and a first driven pulley 42 that is a rib pulley having a pulley diameter of 75 mm is provided to the right of the drive pulley 41.
  • a second driven pulley 43 which is a rib pulley having a pulley diameter of 50 mm, is provided above the first driven pulley 42 and diagonally right above the driving pulley 41.
  • An idler pulley 44 which is a flat pulley having a pulley diameter of 75 mm, is provided in the middle.
  • the V-rib side of the V-ribbed belt B is in contact with the drive pulley 41, the first and second driven pulleys 42, 43, which are rib pulleys, and the back side is a flat pulley. It is configured to be wound around in contact with the idler pulley 44.
  • V-ribbed belts each having a compressed rubber layer formed of the uncrosslinked rubber compositions of Examples 1 to 3 and Comparative Examples 1 and 2 were manufactured.
  • the running test machine 40 position the pulley so that a belt tension of 49 N per rib is applied, give resistance to the second driven pulley 43 so that a current of 60 A flows to the alternator to which it is attached.
  • the drive pulley 41 was rotated at a rotation speed of 800 rpm, and water was dropped at a rate of 1000 ml per minute on the V rib side of the V ribbed belt B at the entry portion of the V ribbed belt B into the drive pulley 41.
  • production situation at the time of belt running was evaluated in four steps, large, small, minute, and nothing.
  • Table 1 shows the test results.
  • the average pore diameter of the hollow holes due to the hollow particles is relatively large as 92 ⁇ m, 109 ⁇ m, and 78 ⁇ m, whereas only the hollow particles are used.
  • the average pore diameter of the hollow holes by the hollow particles is 50 ⁇ m, which is smaller than the concave holes by the hollow particles of Examples 1 to 3.
  • Examples 1 to 3 have a higher noise suppressing effect during belt travel than Comparative Examples 1 and 2.
  • the present invention is useful for a transmission belt and a manufacturing method thereof.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)

Abstract

La présente invention porte sur un procédé de fabrication de courroie de transmission dans lequel une partie de contact avec une poulie est formée par une composition de caoutchouc sur la surface de laquelle un grand nombre de trous en creux, formés par l'expansion de particules creuses par chauffage, mise sous pression et réticulation d'une composition de caoutchouc non réticulée formée par mélange des particules creuses qui n'ont pas encore été expansées et d'un agent gonflant thermiquement décomposable en un élément en caoutchouc, sont exposés. La température de décomposition de l'agent gonflant thermiquement décomposable est supérieure à la température de début d'expansion des particules creuses.
PCT/JP2015/003192 2014-08-26 2015-06-25 Courroie de transmission et procédé de fabrication s'y rapportant WO2016031112A1 (fr)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017123722A1 (de) * 2017-10-12 2019-04-18 Arntz Beteiligungs Gmbh & Co. Kg Wenigstens dreischichtiger Kraftübertragungsriemen mit geschäumter Pufferschicht

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52123457A (en) * 1976-04-08 1977-10-17 Keiichi Yamamoto Resilient composite foamed material and its manufacturing process
JPS5774340A (en) * 1980-10-27 1982-05-10 Meiji Gomme Kasei:Kk Rubber composition
JPS591541A (ja) * 1982-06-29 1984-01-06 Japan Synthetic Rubber Co Ltd 発泡ゴム組成物
JPH11275930A (ja) * 1998-03-27 1999-10-12 Mitsuboshi Belting Ltd 農作物収穫用ベルト
WO2009101799A1 (fr) * 2008-02-13 2009-08-20 Bando Chemical Industries, Ltd. Courroie de transmission par frottement
WO2012172717A1 (fr) * 2011-06-17 2012-12-20 バンドー化学株式会社 Procédé de fabrication d'une courroie à nervures en v

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52123457A (en) * 1976-04-08 1977-10-17 Keiichi Yamamoto Resilient composite foamed material and its manufacturing process
JPS5774340A (en) * 1980-10-27 1982-05-10 Meiji Gomme Kasei:Kk Rubber composition
JPS591541A (ja) * 1982-06-29 1984-01-06 Japan Synthetic Rubber Co Ltd 発泡ゴム組成物
JPH11275930A (ja) * 1998-03-27 1999-10-12 Mitsuboshi Belting Ltd 農作物収穫用ベルト
WO2009101799A1 (fr) * 2008-02-13 2009-08-20 Bando Chemical Industries, Ltd. Courroie de transmission par frottement
WO2012172717A1 (fr) * 2011-06-17 2012-12-20 バンドー化学株式会社 Procédé de fabrication d'une courroie à nervures en v

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017123722A1 (de) * 2017-10-12 2019-04-18 Arntz Beteiligungs Gmbh & Co. Kg Wenigstens dreischichtiger Kraftübertragungsriemen mit geschäumter Pufferschicht
DE102017123722B4 (de) 2017-10-12 2020-05-28 Arntz Beteiligungs Gmbh & Co. Kg Wenigstens dreischichtiger Kraftübertragungsriemen mit geschäumter Pufferschicht und Verfahren zur Herstellung eines solchen Kraftübertragungsriemens

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