Patent ID: 7467798
Filing Date: 2008-12-23
Classification: F16J

Abstract:
1. A rotation shaft seal provided with a rubber sealing portion having a sliding portion, which contacts a surface of a rotation shaft on an end portion of a lip, and a back-supporting metal, which supports the rubber sealing portion from a back face side, having a cylindrical supporting portion and an orthogonal wall portion, the cylindrical supporting portion of which supports the lip of the rubber sealing portion from an inner peripheral side, comprising a construction in which an entire cross-sectional configuration of the cylindrical supporting is formed perpendicular to a longitudinal axis along the direction of the rotation shaft seal and ununiform to a circle in radial direction defining a non-circular cross-section in a peripheral direction about the rotation shaft, to make contact pressure of the sliding portion of the end portion of the lip on the surface of the rotation shaft ununiform in peripheral direction.