Patent ID: 7134670
Filing Date: 2006-11-14
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 and an outer case, having a cylindrical wall portion, to which the rubber sealing portion is unitedly fixed, comprising a construction in which the outer case has an inner brim portion on an inner end portion on a sealed fluid side, the inner brim portion is covered by the rubber sealing portion, the rubber sealing portion, provided with an axis-orthogonal wall portion having the sliding portion on an inner peripheral edge, directly receives pressure in a sealed fluid chamber, and an axis-orthogonal supporting metal portion, having a peripheral edge portion that contacts an inner peripheral face of the cylindrical wall portion of the outer case, supporting the axis-orthogonal wall portion from a low pressure side, is attached, and a position of the sliding portion in an axis direction is disposed within a width dimension of the outer case in the axis direction including a thickness dimension of a rubber covering layer on the sealed fluid side covering the inner brim portion, the axis-orthogonal wall portion of the rubber sealing portion has a concave groove on a back face corresponding to the supporting metal portion, and the concave groove at least absorbs flow in an inner radial direction of rubber compressed by receiving pressure.