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Sealing device

  • US 9,388,705 B2
  • Filed: 03/11/2013
  • Issued: 07/12/2016
  • Est. Priority Date: 03/12/2012
  • Status: Active Grant
First Claim
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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 said outer peripheral ring is formed on its outer peripheral surface with a concave portion which extends from an end of a high pressure side to a position which does not arrive at an end of a low pressure side, so as to introduce fluid thereinto from the high pressure side, said concave portion extending along at least a majority of a width of the outer peripheral ring.

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