Mitsuboshi Belting Ltd.

Takayuki Utsumi

Yorifumi Hineno

Manabu Mitsutomi

Masakuni Yoshida

Takeshi Nishiyama

A power transmission belt having a body with a length, an inside and an outside. Teeth are spaced along the length of the body. The body is made of rubber in which at least one load carrying member is embedded. The load carrying member extends lengthwise of the body. The rubber in the body is made up of: a) 3 to 7 parts by mass of short fiber blended relative to 100 parts by mass of a polymer that is a hydrogenated nitrile rubber having unsaturated carboxylic acid metal salt formed by mixing the hydrogenated nitrile rubber and the unsaturated carboxylic acid metal salt at a mass ratio of from 100:100 to 100:180; and b) no more than 10 parts by mass of a powdery inorganic filler blended relative to 100 parts by mass of the polymer.

Toothed power transmission belt

A power transmission belt having a body with a rubber layer defining spaced friction drive surfaces at laterally oppositely facing side surfaces. Short reinforcing fibers are embedded in the rubber layer in an amount of 15-50 parts by weight per 100 weight percent of rubber in the rubber layer. The short reinforcing fibers include polyamide short reinforcing fibers that make up at least 50 weight percent of the short reinforcing fibers embedded in the rubber layer. A plurality of the polyamide short reinforcing fibers project from the friction drive surfaces and have exposed, flattened ends. Flat particles of inorganic powder are adhered to the friction drive surfaces to reside captively between the flattened ends of the polyamide short reinforcing fibers and locations on the friction drive surfaces at which the short reinforcing fibers do not project.

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Himeji, Japan

Takayuki Utsumi