Patent ID: 9322475
Filing Date: 2016-04-26
CPC Classification: F16J

Claim Text:
1. A sealing element in combination with a housing part and a shaft which is rotatable at a passage opening of the housing part, the sealing element being positioned between the housing part and the shaft to seal the shaft, the sealing element comprising: a stiffening part, a first elastomer part contacting the housing part and providing a static seal relative to the housing part; the first elastomer part being made of a first elastomer material and being connected to the stiffening part; a second elastomer part of a second elastomer material which is different from the first elastomer material; the second elastomer part being connected to the stiffening part; the second elastomer part comprising a sealing section contacting the shaft to provide a static seal relative to the shaft to seal a space to be sealed from an outside, the sealing section possessing an inside surface facing the shaft, the second elastomer part including a flared section which flares radially outwardly away from the shaft; at least three grooves provided on the inside surface of a circular cylinder portion of the sealing section to permit fluid return toward the space to be sealed; the at least three grooves being circumferentially spaced apart on the inside surface of the circular cylinder portion of the sealing section; each of the at least three grooves having a first end located closer to the flared section and an opposite end farther from the flared section, the first end of each of the at least three grooves terminating at a region at one axial end portion of the circular cylinder portion of the sealing section which is peripherally closed in itself such that the first end of each of the three grooves terminates at a portion of the circular cylinder portion of the sealing section in contact with the shaft; wherein the second elastomer part comprises a fluoroelastomer, wherein the second elastomer part comprises a secondary sealing lip arranged in contacting relationship the shaft and made of a material which provides a breathing activity or filter effect while adjoining the shaft, and wherein at least two of the grooves are arc-shaped and cross each other without connecting the space to be sealed with the outside.