Patent ID: 8235391

Claim:
A radial shaft seal assembly, comprising: an outer case having an axially extending cylindrical outer rim and an axially extending cylindrical inner rim spaced radially inwardly from said outer rim by an annular pocket with a radially extending first leg connecting said outer rim to said inner rim and a second leg extending radially inwardly from said inner rim to a free end; a wear sleeve having an axially extending cylindrical wall with an inner surface configured for fixed mounting to a shaft and an outer surface providing a running surface with a flange extending radially outwardly from said running surface; a primary seal lip extending radially inwardly from said free end of said second leg into sealing abutment with said running surface of said wear sleeve; a porous first filter received in said annular pocket; a porous second filter extending in substantial abutment with said outer rim and said second leg of said outer case, and said first filter abuts said second filter.