Patent ID: 8313104

Claim:
A sealing device mounted in an annular groove formed in one of two members that are a housing having a shaft hole and a shaft inserted into the shaft hole to seal an annular gap between the two members, the device comprising a seal ring for sliding against the other member due to relative axial movements of the two members; wherein the seal ring includes, on each of axial opposite end portions of a sliding surface sliding against the other member, a plurality of grooves extending from an end face of the seal ring toward an axial center of the sliding surface; a boundary between the grooves and the sliding surface is formed only of lines inclined with respect to a sliding direction of the sliding surface; the plurality of grooves are arranged to be adjacent to each other in a circumferential direction so that an area in which the boundary is formed of the inclined lines continues along an entire circumference of the sliding surface; and wherein the sliding surface includes a recessed portion between the grooves formed at one end portion and the grooves formed at the other end portion.