Patent ID: 6722659
Filing Date: 2004-04-20
Classification: F16J

Abstract:
A shaft seal comprising:at least one sealing lip which bears with a sealing-lip supporting surface against an opposite surface moving relative to the seal at a predetermined surface pressure applied by a prestressing element, said sealing lip having a main body element and at least one projection, which is supported by and adjacent to said main body element, said projection bears against the opposite surface, said projection is a sacrificial element which abrades due to friction with said opposite surface and in the process polishes said opposite surface, the radial cross-sectional profile of said projection being such that said sealing-lip supporting surface is not substantially enlarged by abrasion thereby maintaining a predetermined surface pressure at said sealing-lip surface of said projection over a service life of the seal wherein said projection has, in the direction parallel to the sealing-lip supporting surface, at least one layer made of a grinding material.