Patent ID: 6334618
Filing Date: 2002-01-01
Classification: F16J

Abstract:
A sealing device disposed between a relatively movable shaft and a housing, said sealing device comprising:a rigid annular casing; a molded elastic rubber annular sealing lip provided on said rigid annular casing and disposed in an axial direction of said rigid annular casing, said annular sealing lip having a frustoconical air-side surface and a frustoconical oil-side surface on a radially inner surface of said sealing lip; a portion of said sealing lip integrally formed as a part of said sealing lip being a cross-linking reaction to a source of radiation to become a harder portion of the sealing lip as compared to a remaining portion of the sealing lip; a surface of said harder portion disposed on said frustoconical air-side surface; a hardness of said harder portion being harder than a hardness of the remaining portion of said sealing lip; and a plurality of said harder portions being arranged independently in a circumferential direction of said sealing lip so as to provide alternating hard and soft regions in a single unitary piece sealing lip.