Patent ID: 9599227
Date: 2017-03-21
CPC Classifications: F16J

Claim:
1. A lip seal comprising: a lip part in sliding contact with an entire periphery of a surface of a shaft; an elastic arm part and a flexible wall supporting the lip part at a sliding contact position; key parts connecting the elastic arm part and the flexible wall to a housing, respectively, and each having a ring shape; a pressure regulation chamber with a ring shape using the elastic arm part and the flexible wall as partition walls, wherein the flexible wall deforms due to increase or decrease in pressure in the pressure regulation chamber to cause the lip part to change at least radially with the shaft as a center; wherein said elastic arm part extends from said key parts connecting the elastic arm part to said housing from an elastic-arm housing connection point with said elastic arm part extending at an acute angle to said surface of said shaft with said lip being substantially laterally displaced along a lengthwise direction of the shaft from said elastic-arm housing connection point due to said acute angle, and wherein said flexible wall extends from said key parts connecting the flexible wall to said housing from a flexible-wall housing connection point to an elastic-arm flexible wall connection point, wherein said flexible-wall housing connection point and said elastic-arm flexible wall connection point are substantially laterally aligned along the lengthwise direction of the shaft.