V-ribbed belt and application thereof

Abstract

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.

Dependencies are inferred from the claim text.