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US 12,085,143 B2Granted
V-ribbed belt and use thereof
AssigneeMitsuboshi Belting Ltd.
InventorsHiroki Takechi, Hiroki Imai, Manabu Mitsutomi
Life of this patent
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Abstract
A V-ribbed belt in which a friction transmission surface of a compression rubber layer is coated with a knit fabric is provided. The compression rubber layer is formed of the cured product of a rubber composition containing an ethylene-α-olefin elastomer and carbon black wherein the carbon black contains a soft carbon having a primary particle diameter of at least 40 nm and a hard carbon having a primary particle diameter of less than 40 nm. The ratio between the number of particles of the soft carbon and hard carbon is former/latter=3/97 to 25/75.
Claims9
A V-ribbed belt comprising:
- a compression rubber layer having a frictional power-transmission surface covered with a knitted cloth,
- wherein
- the compression rubber layer comprises a cured material of a rubber composition comprising an ethylene-α-olefin elastomer and a carbon black,
- the carbon black comprises a soft carbon having a primary particle size of 40 nm or more and a hard carbon having a primary particle size of less than 40 nm,
- a ratio of number of particles between the soft carbon and the hard carbon satisfies a relation of former/latter=3/97 to 15/85,
- the rubber composition further comprises a staple fiber having a proportion of 10 parts by mass or lower with respect to 100 parts by mass of the ethylene-α-olefin elastomer, and
- the carbon black has a proportion of 70 parts by mass or higher and 150 parts by mass or lower with respect to 100 parts by mass of the ethylene-α-olefin elastomer.
4 more elements
Dependencies are inferred from the claim text.