Patent ID: 7901313

Claim:
A V-ribbed belt, comprising: an adhesion rubber layer which is formed of a vulcanizate of an ethylene-α-olefin-diene rubber compound wherein the ethylene-α-olefin-diene rubber has an ethylene content of 50-60% by weight, and which has a plurality of load carrying cords formed of fiber cords adhered to and embedded therein; and a compression rubber layer which is formed of a vulcanizate of an ethylene-α-olefin-diene rubber compound wherein the ethylene-α-olefin-diene rubber has an ethylene content of 55-85% by weight, wherein the compression rubber layer contains no short fibers or contains short fibers that are oriented in the lengthwise direction of the belt and present in an amount of not more than 5 parts by weight in relation to 100 parts by weight of the ethylene-α-olefin-diene rubber in the compression rubber layer, wherein the compression rubber layer has a modulus of elasticity in tension of A in the lengthwise direction of the belt and a modulus of elasticity in tension of B in the widthwise direction of the belt, and A and B satisfy the relationship: 0.9<A/B<1.2, and wherein the compression rubber layer comprises a vulcanizate of an ethylene-α-olefin-diene rubber compound which comprises ultra high molecular weight polyethylene, and the ethylene-α-olefin-diene rubber compound has an ethylene content of not less than 55% by weight and less than 60% by weight and the content of the ultra high molecular weight polyethylene in the compound is 1-50 parts by weight in relation to 100 parts by weight of the ethylene-α-olefin-diene rubber.