Mitsuboshi Belting Ltd.

Hiroki Imai

Yorifumi Hineno

Arata Hasegawa

Yuji Maruyama

Manabu Mitsutomi

Hisato Ishiguro

Hiroki Takechi

Masashi Tamura

Yuji Kamba

Yasutsugu Kunihiro

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.

V-ribbed belt and use thereof

In a V-ribbed belt provided with a compressed rubber layer having V-ribbed portions extending parallel to one another in a belt longitudinal direction, and having a friction transmission surface at least a portion of which is capable of coming into contact with a V-ribbed groove portion of a pulley, the friction transmission surface of the compressed rubber layer is formed from a rubber composition vulcanizate including a rubber component and a sound generation resistance improving agent. A difference between a radius of curvature of a rib distal end portion of the pulley and a radius of curvature of a rib bottom portion of the belt is adjusted to be −0.08-0.08 mm. The radius of curvature of the rib bottom portion may be approximately 0.1-0.5 mm. The radius of curvature difference may be −0.05-0.05 mm. The pulley may include a pulley having an outer diameter at most equal to 65 mm.

V-ribbed belt and application thereof

A V-ribbed belt has a plurality of V-rib portions extending along a longitudinal direction of the belt and in parallel with one another. The V-ribbed belt includes a compression rubber layer including a frictional power transmission face at least a part of which is configured to come in contact with a V-rib groove portion of pulleys. The frictional power transmission face of the compression rubber layer is formed from a vulcanizate of a rubber composition containing a rubber component and a noise suppression improver. A V-rib angle of the V-rib portions is larger than a V-rib groove angle of the pulleys by 5&#xb0; to 9&#xb0;.

The present invention relates to a frictional power transmission belt containing a compression layer having a power transmission surface, at least a part of which is capable of coming into contact with a pulley, in which the compression layer contains a polymer component and a polyvinyl alcohol-based resin.

Friction transmission belt and manufacturing method thereof

The present invention relates to a frictional power transmission belt containing an extensible layer to form a belt back surface, a compressive layer formed on one surface of the extensible layer and having a power transmission surface at least a part of which can be in contact with pulleys, and a tension member embedded between the extensible layer and the compressive layer along a belt length direction, in which at least the compressive layer is formed of a rubber composition containing a polymer component, short fibers and a surfactant and in which the short fibers contain at least short fibers of water-absorbing fibers.

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Hyogo, Japan

Hiroki Imai