WO2024053296A1 - Vベルト - Google Patents
Vベルト Download PDFInfo
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- WO2024053296A1 WO2024053296A1 PCT/JP2023/028251 JP2023028251W WO2024053296A1 WO 2024053296 A1 WO2024053296 A1 WO 2024053296A1 JP 2023028251 W JP2023028251 W JP 2023028251W WO 2024053296 A1 WO2024053296 A1 WO 2024053296A1
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- Prior art keywords
- belt
- rubber
- mass
- rubber layer
- rubber composition
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
- F16G5/00—V-belts, i.e. belts of tapered cross-section
- F16G5/04—V-belts, i.e. belts of tapered cross-section made of rubber
- F16G5/06—V-belts, i.e. belts of tapered cross-section made of rubber with reinforcement bonded by the rubber
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- 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 V-belt.
- Transmission belts are widely used in general industrial machinery and transportation equipment such as four-wheeled vehicles and two-wheeled vehicles. Transmission belts are strongly required to have durability so that they can be used for a long period of time and can be replaced less frequently.
- Patent Document 1 proposes a highly durable power transmission belt that uses EPDM rubber that has excellent weather resistance and cold resistance.
- An object of the present invention is to provide a novel V-belt with excellent durability.
- the configuration of the present invention for solving the above problems is as follows. 1. an adhesive rubber layer in which core wires extending in the longitudinal direction of the belt are embedded; a compressed rubber layer laminated on the inner peripheral side of the belt of the adhesive rubber layer, The rubber composition forming the compressed rubber layer has a dynamic strain of 0.1 measured by a tensile method at a frequency of 10 Hz and a test temperature of 25° C. based on JIS K6394 of a rubber composition test piece taken in the belt width direction.
- a V-belt that is characterized by satisfying both of the following. (1)X>800 (2) Y>-42.05 ⁇ ln(X)+340 2.
- the rubber composition is characterized in that it contains adhesion-treated aramid staple fibers. V-belt described in . 3.
- the rubber composition is characterized in that it contains an ethylene- ⁇ olefin elastomer as a rubber component. or 2. V-belt described in . 4. 1.
- the rubber composition is characterized in that it contains an unsaturated carboxylic acid metal salt. ⁇ 3.
- the V-belt of the present invention has excellent durability.
- the V-belt of the present invention has excellent durability in both low-speed and high-speed power transmission, and can reduce the frequency of replacement.
- FIG. 1 is a schematic diagram of a double cogged V-belt that is an embodiment of the present invention.
- 2 is a graph showing the relationship between storage elastic modulus and elongation rate of double cogged V-belts obtained in Examples and Comparative Examples.
- the V-belt of the present invention includes an adhesive rubber layer in which a core wire extending in the longitudinal direction of the belt is embedded, and a compressed rubber layer laminated on the inner peripheral side of the belt of the adhesive rubber layer,
- the rubber composition forming the compressed rubber layer has a dynamic strain of 0.1% as measured by a tensile method at a frequency of 10 Hz and a test temperature of 25° C. based on JIS K6394 of a rubber composition test piece taken in the belt width direction.
- FIG. 1 shows a schematic diagram of a double cogged V-belt that is an embodiment of the present invention.
- a double cogged V-belt 1 according to one embodiment includes an adhesive rubber layer 11 in which a core wire 111 extending substantially in the longitudinal direction of the belt is embedded, a compressed rubber layer 12 laminated on the inner circumferential side of the belt of the adhesive rubber layer 11, and an adhesive It has a belt main body 10 in which a rubber layer 11 and an elongated rubber layer 13 laminated on the outer peripheral side of the belt are laminated and integrated.
- a lower cog 12a is formed on the inner peripheral surface of the compressed rubber layer 12, and an upper cog 13a is formed on the outer peripheral surface of the elongated rubber layer 13.
- V-belt of the present invention is not limited to a double-cogged V-belt, and may be a cogged V-belt, a low-edge V-belt, a wrapped V-belt, a V-ribbed belt, or the like.
- the compressed rubber layer 12 has an isosceles trapezoidal cross section in the width direction where the upper base is longer than the lower base, and a lower cog 12a whose longitudinal cross section is approximately sinusoidal along the longitudinal direction of the belt. are arranged at a constant pitch.
- a bottom reinforcing cloth 121 is embedded in the compressed rubber layer 12 so as to cover the inner peripheral surface of the belt, but the bottom reinforcing cloth may not be provided.
- the compressed rubber layer 12 is formed from a rubber composition.
- rubber components contained in this rubber composition include ethylene- ⁇ -olefin elastomer, chloroprene rubber (CR), chlorosulfonated polyethylene rubber (CSM), hydrogenated acrylonitrile rubber (H-NBR), and natural rubber (NR). , styrene-butadiene rubber (SBR), butadiene rubber (BR), nitrile rubber (NBR), etc., and these can be used alone or in combination of two or more.
- ethylene- ⁇ -olefin elastomer examples include ethylene propylene diene rubber (EPDM), ethylene propylene rubber (EPM), ethylene butene rubber (EBM), and ethylene octene rubber (EOM).
- EPDM ethylene propylene diene rubber
- EPM ethylene propylene rubber
- EBM ethylene butene rubber
- EOM ethylene octene rubber
- EPDM, EPM, etc. ethylene- ⁇ -olefin elastomer
- CR chloroprene rubber
- the content of the ethylene- ⁇ -olefin elastomer in the rubber component is preferably 90% by mass or more, more preferably 95% by mass or more, and even more preferably 100% by mass.
- chloroprene rubber (CR) hydrogenated acrylonitrile rubber (H-NBR), natural rubber (NR), etc.
- EPDM preferably has an ethylene content of 40% by mass or more and 60% by mass or less, more preferably 45% by mass or more and 55% by mass or less, and further preferably 50% by mass or more and 53% by mass or less. preferable.
- the diene content of EPDM is preferably 4% by mass or more and 14% by mass or less, more preferably 6% by mass or more and 12% by mass or less, and even more preferably 7% by mass or more and 8% by mass or less.
- the diene component dicyclopentadiene (DCPD), 5-ethylidene-2-norbornene (ENB), 1,4-hexadiene (1,4-HD), etc. can be used, and among these, ENB is included. It is preferable.
- EPDM can be used alone or in combination of two or more different compositions.
- EPDM preferably has a Mooney viscosity of 40 or less at 125 ° C. because the uncrosslinked rubber composition can be kneaded uniformly, and this Mooney viscosity is more preferably 35 or less, and 30 or less. is even more preferable.
- the crosslinking agent for crosslinking the rubber component includes organic peroxides, sulfur, polyamines, oximes, and nitrosos, and one or more of these may also be used. Further, the rubber composition may be crosslinked using an electron beam or the like. Among these, it is preferable to use organic peroxides from the viewpoint of wear resistance.
- any organic peroxide that can crosslink the rubber component can be used without particular limitation, such as di-t-butyl peroxide, t-butylcumyl peroxide, dicumyl peroxide, ⁇ , ⁇ '-bis(t-butylperoxy)-p-diisopropylbenzene, 2,5-dimethyl-2,5-di(t-butylperoxy)hexane, 2,5-dimethyldi(t-butyl)hexane, 2, Examples include 5-dimethyl-2,5-di(benzoylperoxy)hexane, t-butylperoxyisopropyl carbonate, 1,1-bis(t-butylperoxy)-3,5,5-trimethylcyclohexane.
- the content of the organic peroxide is usually preferably, for example, 0.5 parts by mass or more and 10 parts by mass or less, and more preferably 1 part by mass or more and 7 parts by mass or less, based on 100 parts by mass of the rubber component.
- the amount is preferably 2.5 parts by mass or more and 4 parts by mass or less.
- the rubber composition contains a co-crosslinking agent.
- co-crosslinking agent examples include unsaturated carboxylic acid metal salts, N,N'-m-phenylene bismaleimide, ethylene glycol dimethacrylate, trimethylolpropane trimethacrylate, and triallylisocyanurate.
- unsaturated carboxylic acid metal salt is a salt of an unsaturated carboxylic acid having at least one carboxyl group and a metal.
- unsaturated carboxylic acids include monocarboxylic acids such as acrylic acid and methacrylic acid; dicarboxylic acids such as maleic acid, fumaric acid, and itaconic acid.
- Examples of metals include zinc, magnesium, calcium, barium, titanium, chromium, iron, cobalt, nickel, aluminum, tin, and lead.
- the molar ratio of unsaturated carboxylic acid to metal is preferably 2 mol/1 mol.
- Examples of unsaturated carboxylic acid metal salts include zinc acrylate, zinc dimethacrylate, and magnesium dimethacrylate.
- zinc dimethacrylate or N,N'-m-phenylene bismaleimide as a co-crosslinking agent.
- its content is preferably 5 parts by mass or more and 60 parts by mass or less, more preferably 10 parts by mass or more and 50 parts by mass or less, and 25 parts by mass or more and 45 parts by mass or less, based on 100 parts by mass of the rubber component. Parts by mass or less are more preferable.
- N,N'-m-phenylene bismaleimide is included, its content is preferably 1 part by mass or more and 20 parts by mass or less, more preferably 2 parts by mass or more and 10 parts by mass or less, per 100 parts by mass of the rubber component. , more preferably 3 parts by mass or more and 7 parts by mass or less.
- the rubber composition contains short fibers.
- short fibers include para-aramid short fibers, meta-aramid short fibers, polyparaphenylene benzobisoxazole short fibers, nylon 6 short fibers, nylon 6,6 short fibers, nylon 4,6 short fibers, polyethylene terephthalate short fibers, and polyethylene naphthalate short fibers.
- One or more types of fibers, cellulose fibers, and natural fibers such as pulp and cotton can be used.
- the short fibers can also be subjected to RFL treatment in which they are immersed in an aqueous resorcinol/formalin/latex solution and then heated. It is preferable that the blending amount of the total short fibers with respect to 100 parts by mass of the rubber component is 10 parts by mass or more and 35 parts by mass or less.
- the fiber length of the short fibers is preferably 1 mm or more and 10 mm or less, more preferably 2 mm or more and 3.5 mm or less.
- the fiber diameter of the short fibers is preferably 5 ⁇ m or more and 50 ⁇ m or less, more preferably 7 ⁇ m or more and 20 ⁇ m or less, and even more preferably 11 ⁇ m or more and 13 ⁇ m or less.
- the short fiber is an aggregate of filaments, and the fineness of the filaments constituting the short fiber is preferably 1 dtex or more and 5 dtex or less, more preferably 1.4 dtex or more and 1.6 dtex or less.
- the short fibers preferably include aramid short fibers, and more preferably adhesive-treated aramid short fibers.
- the aramid short fibers are preferably para-based.
- Adhesion treatments include RFL treatment, which involves immersion in an aqueous resorcinol/formalin/latex solution and then heating; adhesion treatment, which involves immersion in rubber glue and then drying; and immersion in an adhesive solution made of epoxy resin or polyisocyanate resin, followed by heating. Any one or more of the following adhesive treatments can be applied.
- Two or more types of aramid short fibers can be used, which differ in material, fiber length, fiber diameter, filament fineness, presence or absence of adhesive treatment, etc.
- the amount of the adhesive-treated aramid short fibers in the entire rubber composition is preferably 10 parts by mass or more and 35 parts by mass or less based on 100 parts by mass of the rubber component, and 15 parts by mass.
- the content is more preferably 33 parts by mass or more, and even more preferably 20 parts by mass or more and 30 parts by mass or less.
- the rubber composition also contains reinforcing agents, processing aids, vulcanization accelerators, vulcanization accelerating aids, anti-aging agents, process oils, scorch inhibitors, ultraviolet absorbers, light stabilizers, softeners, and blowing agents. , foaming aids, lubricants, flame retardants, antistatic agents, colorants, plasticizers, and other additives. Note that, in the present invention, these additives are optional and may not be included. However, in the present invention, "contains” means that the agent is blended at a concentration that can exhibit its effects, and “does not contain” does not exclude blending at a concentration that does not exhibit the effects of the agent.
- inorganic particles such as silica, carbon black, titanium oxide, aluminum oxide, calcium carbonate, magnesium carbonate, zinc carbonate, barium sulfate, diatomaceous earth, clay, talc, zinc oxide, etc. are blended. be able to.
- the blending amount of the inorganic particles is preferably 10 parts by mass or more, more preferably 20 parts by mass or more, based on 100 parts by mass of the rubber component.
- the upper limit of this blending amount is preferably 100 parts by mass or less, more preferably 90 parts by mass or less.
- carbon black As the inorganic particles, it is preferable to use carbon black from the viewpoints of imparting conductivity, reinforcing properties, anti-ultraviolet deterioration properties, and the like.
- the carbon black to be blended is not particularly limited, and examples include channel black; furnace black such as SAF, ISAF, N-339, HAF, N-351, MAF, FEF, SRF, GPF, ECF, and N-234; FT, MT; Thermal blacks include acetylene black, Ketjen black EC300J, Ketjen black EC600JD, etc., and one type or two or more types can be blended. Among these, ISAF, HAF, and FEF are preferred.
- processing aids include stearic acid, polyethylene wax, and metal salts of fatty acids. One or more of these processing aids can be used.
- the content of the processing aid is, for example, 0.5 parts by mass or more and 2 parts by mass or less with respect to 100 parts by mass of the rubber component.
- vulcanization accelerators include thiuram-based (e.g., TETD, TT, TRA, etc.), thiazole-based (e.g., MBT, MBTS, etc.), sulfenamide-based (e.g., CZ, etc.), and dithiocarbamate-based (e.g., BZ-P). etc.).
- thiuram-based e.g., TETD, TT, TRA, etc.
- thiazole-based e.g., MBT, MBTS, etc.
- sulfenamide-based e.g., CZ, etc.
- dithiocarbamate-based
- Examples of the vulcanization accelerator include metal oxides such as zinc oxide (zinc white) and magnesium oxide, metal carbonates, fatty acids, and derivatives thereof. As the vulcanization accelerator, one or more of these can be used. The content of the vulcanization accelerator is 3 parts by mass or more and 7 parts by mass or less based on 100 parts by mass of the rubber component.
- Examples of anti-aging agents include amine-ketone anti-aging agents, diamine anti-aging agents, phenolic anti-aging agents and the like. As the anti-aging agent, one type or two or more types of these can be used. The content of the anti-aging agent is 0.1 parts by mass or more and 5 parts by mass or less based on 100 parts by mass of the rubber component.
- Examples of the process oil include paraffin oil, naphthenic oil, ester oil, aromatic oil, and the like. As the process oil, one type or two or more types of these can be used.
- the content of the process oil is preferably 0.1 to 40 parts by mass, more preferably 0.1 to 20 parts by mass, per 100 parts by mass of the rubber component.
- the rubber composition forming the compressed rubber layer of the present invention has a dynamic strain of 0 measured by a tensile method at a frequency of 10 Hz and a test temperature of 25°C based on JIS K6394 of a rubber composition test piece taken in the belt width direction.
- E' storage elastic modulus
- Y %
- the storage elastic modulus is based on JIS K6394:2007, where the average strain is the strain when a load of 1.3 times the load at 1% strain is applied, the strain amplitude is 0.1%, the frequency is 10Hz, and This is a value measured by a tensile method at a test temperature of 25°C. Further, the elongation rate is a value measured based on JIS K6251:2017.
- the elongation rate value Y (%) of the rubber composition test piece should be Y>-42.05 ⁇ ln(X)+342 or more, especially from the viewpoint of obtaining excellent durability during high-speed driving with a large gear ratio. It is preferable that Y>-42.05 ⁇ ln(X)+345 or more, more preferably Y>-42.05 ⁇ ln(X)+350 or more.
- the bottom reinforcing cloth 121 is made of, for example, a woven fabric, a knitted fabric, a non-woven fabric, etc. made of synthetic fibers or natural fibers. Further, a back reinforcement cloth can also be provided on the outer peripheral surface of the elongated rubber layer 13.
- these reinforcing fabrics are treated with RFL treatment in which they are immersed in a resorcinol/formalin/latex aqueous solution and then heated, adhesive treatment in which they are dipped in rubber glue and then dried, and epoxy resin or polyisocyanate. Any one or more of the adhesion treatments of heating after being immersed in an adhesive solution made of a solution of resin or the like can be performed.
- Both the adhesive rubber layer 11 and the elongated rubber layer 13 are formed from a rubber composition.
- the rubber compositions for forming the adhesive rubber layer 11 and the elongated rubber layer 13 can be the same as the rubber compositions for forming the compressed rubber layer 12 described above, respectively. It may be the same as or different from the rubber composition.
- a core wire 111 extending in the longitudinal direction of the belt is embedded in the adhesive rubber layer 11 .
- the core wire 111 is made of a wire such as a twisted yarn or a braid made of polyethylene terephthalate (PET) fiber, polyethylene naphthalate (PEN) fiber, para-aramid fiber, vinylon fiber, or the like.
- PET polyethylene terephthalate
- PEN polyethylene naphthalate
- para-aramid fiber vinylon fiber, or the like.
- the core wire 111 is subjected to an RFL treatment in which it is immersed in a resorcinol/formalin/latex aqueous solution and then heated, and an adhesive treatment in which it is dipped in rubber glue and then dried. , or an adhesive treatment in which the adhesive is immersed in an adhesive solution made of an epoxy resin, a polyisocyanate resin, or the like and then heated.
- the method for manufacturing the V-belt of the present invention is not particularly limited, and can be manufactured by any known method, including, for example, the following method.
- Various materials are kneaded to obtain an uncrosslinked rubber composition for a compressed rubber layer, which is then molded into a sheet to obtain an uncrosslinked rubber sheet.
- An uncrosslinked rubber sheet is wrapped around the outer peripheral surface of a cylindrical mold having lower cog forming grooves continuous in the circumferential direction on the outer peripheral surface. After wrapping release paper around the outer periphery, a rubber sleeve is placed over it, and this is placed inside the vulcanizing can and sealed, and the vulcanizing can is filled with high-temperature and high-pressure steam to maintain the condition as specified. Hold only for time.
- the uncrosslinked rubber sheet flows and is press-fitted into the lower cog forming groove, and the crosslinking progresses by about half, forming a cylindrical lower cog composite with a lower cog formed on the inner periphery. Ru.
- the grain direction thereof be arranged in the axial direction of the cylindrical shape, that is, in the belt width direction.
- the outer periphery of the lower cog complex is ground to adjust its thickness.
- an uncrosslinked rubber sheet for forming an adhesive rubber layer is wrapped around the outer circumferential surface of the lower cog composite, a core wire is spirally wound thereon, and further an uncrosslinked rubber sheet is wound for forming an adhesive rubber layer on top of the uncrosslinked rubber sheet.
- An uncrosslinked rubber sheet and an uncrosslinked rubber sheet for forming an elongated rubber layer are wound in order to form an uncrosslinked slab.
- This uncrosslinked slab is covered with a rubber sleeve having upper cog forming grooves continuous in the circumferential direction on the inner circumferential surface, and then a second rubber sleeve is placed over the uncrosslinked slab, and this is placed in a vulcanization can.
- the vulcanizer is sealed and filled with high-temperature and high-pressure steam, and this state is maintained for a predetermined period of time.
- the adhesive rubber layer and the core wire become composite and integrated.
- the uncrosslinked rubber sheet for forming the elongated rubber layer flows and is press-fitted into the upper cog forming groove, and its crosslinking progresses to form a cylindrical belt slab.
- the steam is discharged from the vulcanizing can, the seal is broken, the rubber sleeve is removed, and after cooling, the belt slab is removed from the mold. After cutting the belt slab to a predetermined width, the belt slab is cut to form a V side surface to obtain a double cogged V belt.
- a compressed rubber layer was formed with the formulation shown in Table 1 below, and a double cogged V-belt with a circumferential length of 1200 mm, a maximum width of 33 mm, and a maximum thickness of 16 mm was obtained by the above method.
- the elongated rubber layer and the adhesive rubber layer of the double cogged V-belt were formed from a crosslinked rubber composition containing EPDM as a rubber component.
- the core wire was composed of twisted para-aramid fibers.
- the bottom reinforcing fabric was composed of a woven fabric of PET fiber.
- the rubber composition forming the compressed rubber layer was prepared by kneading short fibers and agents other than the crosslinking agent in a Banbury mixer, cooling them, and then adding the short fibers and the crosslinking agent and kneading.
- EPDM1 T7241 manufactured by JSR, ethylene content: 52% by mass, ENB content: 7.7% by mass, ML (125°C) 27
- EPDM2:X-4010M manufactured by Mitsui Chemicals ethylene content: 54% by mass, ENB content: 7.6% by mass, ML (100°C) 8
- EPDM3 EP123 manufactured by JSR, ethylene content: 58% by mass, ENB content: 4.5% by mass, ML (125°C) 19.5
- EPDM4 NORDEL IP 4725P manufactured by Dow, ethylene content: 70% by mass, ENB content: 4.9% by mass, ML (125°C) 25
- the ML (at 125° C.) of the rubber compositions which are mixtures of a plurality of EPDMs used in Examples 2 and 5, are 20.7 and 35.2, respectively.
- Zinc oxide 3 types of zinc oxide Stearic acid manufactured by Sakai Chemical Co., Ltd.: Stearic acid S50 Lubricant manufactured by Shin Nippon Rika Co., Ltd.: Structol WB16 Anti-aging agent manufactured by S&S Japan Co., Ltd.: Nocrack MB ISAF carbon black manufactured by Ouchi Shinko Chemical Co., Ltd.: Seast 6 Manufactured by Tokai Carbon Co., Ltd., arithmetic mean particle diameter: 22 nm, nitrogen adsorption specific surface area: 119 m 2 /g FEF carbon black: SEAST SO manufactured by Tokai Carbon Co., Ltd., arithmetic mean particle diameter: 43 nm, nitrogen adsorption specific surface area: 42 m 2 /g Process oil: Samper 2280 manufactured by Sun Oil Co., Ltd.
- Co-crosslinking agent 1 Trimethylolpropane trimethacrylate (Hycross M manufactured by Seiko Chemical Co., Ltd.)
- Co-crosslinking agent 2 N,N'-m-phenylene bismaleimide (Barnock PM manufactured by Ouchi Shinko Chemical Industry Co., Ltd.)
- Co-crosslinking agent 3 Zinc methacrylate (Actor ZMA, manufactured by Kawaguchi Chemical Industry Co., Ltd.)
- Crosslinking agent 1 (Organic peroxide type, Perhexa 25B-40 manufactured by NOF Corporation, purity 40% by mass)
- Crosslinking agent 2 (Organic peroxide type, Peroximone F-40 manufactured by NOF Corporation, purity 40% by mass)
- Aramid short fiber A (RFL treatment, para-based, CFH3050 manufactured by Teijin, fiber diameter 12.3 ⁇ m, fiber length 3.0 mm)
- Aramid short fiber B Aramid short fiber A: (RFL treatment, para-based, CFH3050 manufactured by
- the measurement conditions were an average strain of 1.3 times the load applied when the strain was 1%, a strain amplitude of 0.1%, a frequency of 10 Hz, and a test temperature of 25°C.
- ⁇ Elongation rate EB> A test piece with a size of 50 mm in the belt longitudinal direction, 10 mm in the width direction, and 1 mm in thickness was cut from the compressed rubber layer of the double cogged V belt, and the elongation rate at cutting at 25 ° C. was measured based on JIS K6251:2017. .
- the double cogged V-belts obtained in Comparative Examples 1 and 2 had a short belt life in a low-speed layout
- the double-cogged V-belts obtained in Comparative Examples 3 to 5 had a short belt life in a high-speed layout and were inferior in durability.
- the double cogged V-belts obtained in Examples 1 to 6 of the present invention had long belt life and excellent durability in both low-speed and high-speed layouts.
- Double cogged V belt 10 Belt body 11 Adhesive rubber layer 111 Core wire 12 Compressed rubber layer 12a Lower cog 121 Bottom reinforcing cloth 13 Stretch rubber layer 13a Upper cog
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Abstract
Description
1.ベルト長手方向に延びる心線が埋設された接着ゴム層と、
前記接着ゴム層のベルト内周側に積層された圧縮ゴム層と、を有し、
前記圧縮ゴム層を形成するゴム組成物が、ベルト幅方向に採取したゴム組成物試験片のJIS K6394に基づいて、周波数10Hz、及び試験温度25℃として引張方法により測定される動歪0.1%歪の貯蔵弾性率(E’)の値をX(MPa)、ベルト長手方向に採取したゴム組成物試験片の伸長率の値をY(%)としたとき、下記(1)、(2)をともに満足することを特徴とするVベルト。
(1)X>800
(2)Y>-42.05・ln(X)+340
2.前記ゴム組成物が、接着処理されたアラミド短繊維を含むことを特徴とする1.に記載のVベルト。
3.前記ゴム組成物が、ゴム成分としてエチレン-αオレフィンエラストマーを含むことを特徴とする1.または2.に記載のVベルト。
4.前記ゴム組成物が、不飽和カルボン酸金属塩を含むことを特徴とする1.~3.のいずれかに記載のVベルト。
5.コグドVベルトであることを特徴とする1.~4.のいずれかに記載のVベルト。
圧縮ゴム層を形成するゴム組成物が、ベルト幅方向に採取したゴム組成物試験片のJIS K6394に基づいて、周波数10Hz、及び試験温度25℃として引張方法により測定される動歪0.1%歪の貯蔵弾性率(E’)の値をX(MPa)、ベルト長手方向に採取したゴム組成物試験片の伸長率の値をY(%)としたとき、下記(1)、(2)をともに満足することを特徴とする。なお、「ln」は、自然対数である。
(1)X>800
(2)Y>-42.05・ln(X)+340
一実施態様であるダブルコグドVベルト1は、略ベルト長手方向に延びる心線111が埋設された接着ゴム層11と、接着ゴム層11のベルト内周側に積層された圧縮ゴム層12と、接着ゴム層11のベルト外周側に積層された伸長ゴム層13とが積層一体化したベルト本体10を有する。圧縮ゴム層12の内周面に下コグ12a、伸長ゴム層13の外周面には上コグ13aが形成されている。圧縮ゴム層12には、そのベルト内周面を被覆するように底面補強布121が埋設されている。
なお、本発明のVベルトは、ダブルコグドVベルトに限定されず、コグドVベルト、ローエッジVベルト、ラップドVベルト、Vリブドベルト等とすることができる。
圧縮ゴム層12は、その幅方向断面が、上底が下底より長い等脚台形状であり、ベルト長手方向に沿って、長手方向断面が略正弦波形状である下コグ12aが一定ピッチで配設されている。圧縮ゴム層12は、そのベルト内周面を被覆するように底面補強布121が埋設されているが、底面補強布を設けないこともできる。
EPDMは、125℃におけるムーニー粘度が40以下であることが、未架橋ゴム組成物を均一に混練することができるため好ましく、このムーニー粘度は35以下であることがより好ましく、30以下であることがさらに好ましい。
有機過酸化物としては、ゴム成分を架橋できるものを特に制限することなく使用することができ、例えば、ジ-t-ブチルパーオキサイド、t-ブチルクミルパーオキサイド、ジクミルパーオキサイド、α,α’-ビス(t-ブチルパーオキシ)-p-ジイソプロピルベンゼン、2,5-ジメチル-2,5-ジ(t-ブチルパーオキシ)ヘキサン、2,5-ジメチルジ(t-ブチル)ヘキシン、2,5-ジメチル-2,5-ジ(ベンゾイルパーオキシ)ヘキサン、t-ブチルパーオキシイソプロピルカーボネート、1,1-ビス(t-ブチルパーオキシ)-3,5,5-トリメチルシクロヘキサン等が挙げられる。有機過酸化物は、これらのうちの1種又は2種以上を使用することができる。有機過酸化物の含有量は、通常、ゴム成分100質量部に対して、例えば0.5質量部以上10質量部以下であることが好ましく、1質量部以上7質量部以下であることがより好ましく、2.5質量部以上4質量部以下であることがさらに好ましい。
短繊維の繊維径は、5μm以上50μm以下であることが好ましく、7μm以上20μm以下であることがより好ましく、11μm以上13μm以下であることがさらに好ましい。
短繊維はフィラメントの集合体であるが、短繊維を構成するフィラメントの繊度は、1dtex以上5dtex以下であることが好ましく、1.4dtex以上1.6dtex以下であることがより好ましい。
無機粒子としては、カーボンブラックを用いることが導電性付与、補強性、紫外線劣化防止性等の点から好ましい。配合するカーボンブラックは特に制限されず、例えば、チャネルブラック;SAF、ISAF、N-339、HAF、N-351、MAF、FEF、SRF、GPF、ECF、N-234などのファーネスブラック;FT、MTなどのサーマルブラック;アセチレンブラック、ケッチェンブラックEC300J、ケッチェンブラックEC600JD等が挙げられ、1種又は2種以上を配合することができる。これらの中で、ISAF、HAF、FEFが好ましい。
加硫促進剤としては、例えば、チウラム系(例えばTETD、TT、TRAなど)、チアゾール系(例えばMBT、MBTSなど)、スルフェンアミド系(例えばCZなど)、ジチオカルバミン酸塩系(例えばBZ-Pなど)のもの等が挙げられる。加硫促進剤は、これらのうち1種又は2種以上を使用することができる。加硫促進剤の含有量は、例えば、ゴム成分100質量部に対して、2質量部以上5質量部以下である。
老化防止剤としては、例えば、アミン-ケトン系老化防止剤、ジアミン系老化防止剤、フェノール系老化防止剤等が挙げられる。老化防止剤は、これらのうち1種又は2種以上を使用することができる。老化防止剤の含有量は、ゴム成分100質量部に対して、0.1質量部以上5質量部以下である。
プロセスオイルとしては、例えば、パラフィン系オイル、ナフテン系オイル、エステル系オイル、芳香族オイル等が挙げられる。プロセスオイルは、これらのうち1種又は2種以上を使用することができる。プロセスオイルの含有量は、ゴム成分100質量部に対して、好ましくは0.1~40質量部、より好ましくは0.1~20質量部である。
(1)X>800
(2)Y>-42.05・ln(X)+340
なお、貯蔵弾性率は、JIS K6394:2007に基づいて、歪み1%時の荷重の1.3倍の荷重を負荷したときの歪みを平均歪みとし、歪み振幅0.1%、周波数10Hz、及び試験温度25℃として引張方法により測定される値である。また、伸長率は、JIS K6251:2017に基づいて測定される値である。
(2)ゴム組成物試験片の伸長率の値Y(%)は、特にギア比の大きな高速駆動時の優れた耐久性を得る観点から、Y>-42.05・ln(X)+342以上であることが好ましく、Y>-42.05・ln(X)+345以上であることがより好ましく、Y>-42.05・ln(X)+350以上であることがさらに好ましい。
接着ゴム層11、伸長ゴム層13は、いずれもゴム組成物から形成されている。接着ゴム層11、伸長ゴム層13を形成するゴム組成物は、それぞれ上記した圧縮ゴム層12を形成するためのゴム組成物と同様のものを使用することができ、圧縮ゴム層12を形成するゴム組成物と同一であってもよく、異なっていてもよい。
接着ゴム層11は、ベルト長手方向に延びる心線111が埋設されている。
本発明のVベルトの製造方法は特に制限されず、公知の方法により製造することができ、例えば、以下の方法が挙げられる。
各種材料を混練して未架橋の圧縮ゴム層用ゴム組成物を得て、シート状に成形して未架橋のゴムシートを得る。
外周面に周方向に連設された下コグ形成溝を備える円筒型の金型の外周面に、未架橋のゴムシートを巻き付ける。この外周に離型紙を巻き付けた後、その上からゴムスリーブを被せ、これを加硫缶内に配置して密閉するとともに、加硫缶内に高温及び高圧の蒸気を充填し、その状態を所定時間だけ保持する。このとき、未架橋のゴムシートが流動して下コグ形成溝に圧入されるとともに、その架橋が半分程度進行し、内周側に下コグが形成された円筒状の下コグ複合体が成型される。この際、ゴムシートが短繊維を含む場合、その列理方向が円筒型の軸方向となるように、すなわち、ベルト幅方向となるように配することが好ましい。
次いで、下コグ複合体の外周面上に、接着ゴム層を形成するための未架橋ゴムシートを巻き付け、その上に心線を螺旋状に巻き付け、さらにその上に接着ゴム層を形成するための未架橋ゴムシートと伸長ゴム層を形成するための未架橋ゴムシートを順に巻き付けて未架橋スラブを成形する。
この未架橋スラブに、内周面に周方向に連設された上コグ形成溝を備えるゴムスリーブを被せ、次いで、未架橋スラブに第2ゴムスリーブを被せ、これを加硫缶内に配置して密閉するとともに、加硫缶内に高温及び高圧の蒸気を充填し、その状態を所定時間だけ保持する。このとき、下コグ複合体の本架橋が進行するとともに、接着ゴム層と芯線とが複合一体化する。また、伸長ゴム層を形成するための未架橋ゴムシートが流動して上コグ形成溝に圧入されるとともに、その架橋が進行し、円筒状のベルトスラブが成型される。
ベルトスラブを所定幅に幅切りした後、V側面を形成するように切断して、ダブルコグドVベルトが得られる。
下記表1に示す配合で圧縮ゴム層を形成し、上記の方法により、周長1200mm、最大幅33mm、最大厚さ16mmのダブルコグドVベルトを得た。なお、ダブルコグドVベルトの伸長ゴム層及び接着ゴム層は、EPDMをゴム成分とする架橋ゴム組成物で形成した。心線は、パラアラミド繊維の撚り糸で構成した。底面補強布は、PET繊維の織布で構成した。
圧縮ゴム層を形成するゴム組成物は、短繊維と架橋剤以外の剤をバンバリーミキサーで混練、冷却した後、短繊維と架橋剤とを投入して混練した。
EPDM2:X-4010M 三井化学社製、エチレン含量:54質量%、ENB含量:7.6質量%、ML(100℃)8
EPDM3:EP123 JSR社製、エチレン含量:58質量%、ENB含量:4.5質量%、ML(125℃)19.5
EPDM4:NORDEL IP 4725P ダウ社製、エチレン含量:70質量%、ENB含量:4.9質量%、ML(125℃)25
EPDM5:NORDEL IP 4770P ダウ社製、エチレン含量:70質量%、ENB含量:4.9質量%、ML(125℃)70
なお、実施例2、5で使用した複数のEPDMの混合物であるゴム組成物のML(125℃)は、それぞれ20.7、35.2である。
ステアリン酸:ステアリン酸S50 新日本理化社製
滑剤:ストラクトールWB16 エスアンドエスジャパン社製
老化防止剤:ノクラックMB 大内新興化学工業社製
ISAFカーボンブラック:シースト6 東海カーボン社製、算術平均粒子径:22nm、窒素吸着比表面積:119m2/g
FEFカーボンブラック:シーストSO 東海カーボン社製、算術平均粒子径:43nm、窒素吸着比表面積:42m2/g
プロセスオイル:サンパー2280 サン石油社製
共架橋剤1:トリメチロールプロパントリメタクリレート(ハイクロスM 精工化学社製)
共架橋剤2:N,N’-m-フェニレンビスマレイミド(バルノックPM 大内新興化学工業社製)
共架橋剤3:メタクリル酸亜鉛(アクターZMA 川口化学工業社製)
架橋剤1:(有機過酸化物系、パーヘキサ25B-40 日油社製、純度40質量%)
架橋剤2:(有機過酸化物系、ペロキシモンF-40 日油社製、純度40質量%)
アラミド短繊維A:(RFL処理、パラ系、CFH3050 帝人社製、繊維径12.3μm、繊維長3.0mm)
アラミド短繊維B:(RFL処理、パラ系、BKD7041E 東レ・デュポン社製、繊維径17μm、繊維長3.0mm)
ナイロン短繊維:(RFL処理、6,6-ナイロン、CFN3000 旭化成社製、繊維径27.3μm、繊維長3.0mm)
アラミド短繊維A’:(アラミド短繊維AのRFL未処理)
実施例、比較例で得られたダブルコグドVベルトについて、下記評価を行った。結果を表2に示す。また、貯蔵弾性率と伸長率との関係を図2に示す。
<貯蔵弾性率E’>
ダブルコグドVベルトの圧縮ゴム層から、ベルト幅方向に30mm、ベルト長手方向に10mm、厚み1mmの大きさの試験片を切り出し、JIS K6394:2007に基づいて、引張方法により25℃における貯蔵弾性率E’を測定した。測定条件は、歪み1%時の荷重の1.3倍の荷重を負荷したときの歪みを平均歪みとし、歪み振幅0.1%、周波数10Hz、及び試験温度25℃とした。
<伸長率EB>
ダブルコグドVベルトの圧縮ゴム層から、ベルト長手方向に50mm、幅方向に10mm,厚み1mmの大きさの試験片を切り出し、JIS K6251:2017に基づいて、25℃における切断時の伸長率を測定した。
無断変速式のベルト走行試験機を用い、ベルト走行試験を行った。なお、従動プーリは、ダブルコグドVベルトに一定のベルト張力を発生させるように、定荷重DW(デッドウエイト)を負荷できるように構成されている。
・低速レイアウト
ダブルコグドVベルトを、駆動プーリの巻き掛け径が99mm、従動プーリの巻き掛け径が263mmとなるように懸装し、従動プーリに1800Nの定荷重DWを負荷してベルト張力を発生させることにより低速レイアウトを構成した。
その後、雰囲気温度30℃下で、駆動プーリを7500rpmで回転させて低速のベルト走行を開始した。そして、ダブルコグドVベルトが切断するまでベルト走行を行い、ベルト走行開始から切断までの時間を低速ベルト寿命とした。なお、ベルト走行の最長時間を200時間とした。
ダブルコグドVベルトを、駆動プーリの巻き掛け径が210mm、従動プーリの巻き掛け径が165mmとなるように懸装し、従動プーリに2300Nの定荷重DWを負荷してベルト張力を発生させることにより高速レイアウトを構成した。
その後、雰囲気温度100℃下で、駆動プーリを9400rpmで回転させて高速のベルト走行を開始した。そして、ダブルコグドVベルトが切断するまでベルト走行を行い、ベルト走行開始から切断までの時間を高速ベルト寿命とした。なお、ベルト走行の最長時間を50時間とした。
それに対し、本発明である実施例1~6で得られたダブルコグドVベルトは、低速レイアウト、高速レイアウトのどちらでもベルト寿命が長く、耐久性に優れていた。
10 ベルト本体
11 接着ゴム層
111 心線
12 圧縮ゴム層
12a 下コグ
121 底面補強布
13 伸長ゴム層
13a 上コグ
Claims (5)
- ベルト長手方向に延びる心線が埋設された接着ゴム層と、
前記接着ゴム層のベルト内周側に積層された圧縮ゴム層と、を有し、
前記圧縮ゴム層を形成するゴム組成物が、ベルト幅方向に採取したゴム組成物試験片のJIS K6394に基づいて、周波数10Hz、及び試験温度25℃として引張方法により測定される動歪0.1%歪の貯蔵弾性率(E’)の値をX(MPa)、ベルト長手方向に採取したゴム組成物試験片の伸長率の値をY(%)としたとき、下記(1)、(2)をともに満足することを特徴とするVベルト:
(1)X>800、
(2)Y>-42.05・ln(X)+340。 - 前記ゴム組成物が、接着処理されたアラミド短繊維を含むことを特徴とする請求項1に記載のVベルト。
- 前記ゴム組成物が、ゴム成分としてエチレン-αオレフィンエラストマーを含むことを特徴とする請求項1または2に記載のVベルト。
- 前記ゴム組成物が、不飽和カルボン酸金属塩を含むことを特徴とする請求項1または2に記載のVベルト。
- コグドVベルトであることを特徴とする請求項1または2に記載のVベルト。
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| JP4011997B2 (ja) * | 2002-07-08 | 2007-11-21 | バンドー化学株式会社 | ダブルコグドvベルト |
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| JP6680941B1 (ja) * | 2018-11-27 | 2020-04-15 | 三ツ星ベルト株式会社 | ゴム製歯付ベルト及びゴム組成物 |
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