Patent ID: 9309973
Filing Date: 2016-04-12
CPC Classification: F01D,F16J

Claim Text:
1. A sealing device which is fitted into an annular groove formed in an outer periphery of a shaft so as to seal an annular gap between said shaft and a housing which rotate relative to each other, thereby to hold a fluid pressure in a region to be sealed which is constructed such that the fluid pressure therein changes, comprising: an outer peripheral ring made of resin that is in intimate contact with a side wall surface of said annular groove at a low pressure side thereof, and slides with respect to an inner peripheral surface of a shaft hole in said housing through which said shaft is inserted; and an inner peripheral ring made of a rubber-like elastic body that is in intimate contact with an inner peripheral surface of said outer peripheral ring and a groove bottom surface of said annular groove, respectively, thereby to push said outer peripheral ring toward an outer peripheral surface side thereof; wherein a portion in said outer peripheral ring which slides with respect to the inner peripheral surface of said shaft hole is constructed by a raised portion which is formed so as to extend along a majority of a circumferential direction while changing its position to a high pressure side and a low pressure side in an alternate manner.