Patent ID: 8814170
Filing Date: 2014-08-26
Classification: F16J

Abstract:
1. An annular seal member configured to seal a gap between a shaft hole and a shaft inserted into the shaft hole, the annular seal member comprising: an annular base part, which is arranged between the shaft hole and the shaft to be diametrically compressed; an annular lip, which axially extends from one end of the base part and includes a lip edge that is configured to be contact with one of a hole face of the shaft hole and an outer periphery of the shaft, one of which is a seal mating face; a first convex part, which is provided at a face of the base part facing the seal mating face and diametrically protrudes, and which is contacted to the seal mating face due to a fitting interference; a passage recess, which is provided at the face of the base part facing the seal mating face and extends from the other end of the base part toward the annular lip; a concave part, which is provided in vicinity of a base end portion of the annular lip and is provided at the face of the base part facing the seal mating face, and which has a circumferential size larger than a recess width of the passage recess and communicates with the passage recess; and a protrusion, which is provided at a connection part of the passage recess and the concave part and diametrically protrudes to contact with the seal mating face to secure a communication space of the passage recess and the concave part around the protrusion.