Patent ID: 6257587
Filing Date: 2001-07-10
Classification: F16J,Y10S

Abstract:
A dynamic shaft seal assembly comprising:an outer carrier member mountable on a stationary housing;an inner member mountable on a rotatable shaft extending through an opening in the housing for rotation with the shaft relative to said outer carrier member;a lubricant-retention seal disposed on said carrier member;a first debris-exclusion seal disposed on said carrier member adjacent said lubricant-retention seal on an atmosphere side of said seal assembly;a second debris-exclusion seal disposed on one of said outer carrier and inner members and sealingly engaging a corresponding sealing surface of the other of said outer carrier and said inner members in spaced relation to said first debris-exclusion seal defining a protected space therebetween sealed from the outer atmosphere by said second debris-exclusion seal;a porous debris-trapping filter element disposed between said first and second debris-exclusion seals within said protected space; anda shield portion extending from one of said carrier and said inner members into said filter element with relative rotational movement permitted between said filter element and said shield portion.