Frictional transmission belt and production method therefor
AssigneeMitsuboshi Belting Ltd.
InventorsKentaro Yoshimura, Masaki Shibata, Hiroki Takechi, Shohei Daiko
Life of this patent
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Abstract
A frictional power transmission belt includes a compression rubber layer having a frictional power transmission surface that is covered with a fabric. The compression rubber layer includes an inner rubber layer in contact with the fabric and an outer rubber layer on an outer peripheral side of the inner rubber layer. The inner rubber layer is formed of a cured product of a rubber composition including a surfactant as a hydrophilic plasticizer, an unsaturated carboxylic acid metal salt, and polyolefin particles.
Claims19
A frictional power transmission belt comprising a compression rubber layer having a frictional power transmission surface that is covered with a fabric, the compression rubber layer comprising an inner rubber layer in contact with the fabric and an outer rubber layer on an outer peripheral side of the inner rubber layer,
- wherein the inner rubber layer is formed of a cured product of a rubber composition comprising a surfactant as a hydrophilic plasticizer, an unsaturated carboxylic acid metal salt, and polyolefin particles, and
- a proportion of the unsaturated carboxylic acid metal salt is 2 to 10 parts by mass with respect to 100 parts by mass of a rubber component forming the inner rubber layer, and
- wherein the inner rubber layer further comprises a metal oxide and a content of the surfactant is 20-200 parts by mass per 100 parts by mass of the metal oxide.
A method for producing a frictional power transmission belt, the method comprising:
- disposing, on a cylindrical inner mold disposed in a hollow cylindrical outer mold, an unvulcanized laminate including an unvulcanized rubber sheet for a compression rubber layer and a fabric laminated on the unvulcanized rubber sheet so that the fabric is directed toward the outer mold;
- pressurizing the unvulcanized laminate at least toward the outer mold to vulcanize the unvulcanized laminate;
- and
- demolding a molded body of the vulcanized rubber sheet and the fabric to produce a frictional power transmission belt having a predetermined form,
- wherein the unvulcanized rubber sheet is formed of an unvulcanized rubber sheet for an inner rubber layer in contact with the fabric and an unvulcanized rubber sheet for an outer rubber layer on an outer peripheral side of the unvulcanized rubber sheet for the inner rubber layer,
- the unvulcanized rubber sheet for the inner rubber layer is formed of a rubber composition comprising a surfactant as a hydrophilic plasticizer, an unsaturated carboxylic acid metal salt, and polyolefin particles,
- a proportion of the unsaturated carboxylic acid metal salt is 2 to 10 parts by mass with respect to 100 parts by mass of a rubber component forming the inner rubber layer, and
- wherein the inner rubber layer further comprises a metal oxide and a content of the surfactant is 20-200 parts by mass per 100 parts by mass of the metal oxide.
Dependencies are inferred from the claim text.