Patent ID: 6182975
Filing Date: 2001-02-06
Classification: B29C,B29K,B29L,F05C,F16J

Abstract:
A sealing device comprising:a first seal member, bent outwardly, having a seal lip of a rubber-like elastic material to form a rubber seal lip;a second seal member, bent inwardly, having a seal lip of a resin material to form a resin seal lip, wherein said second seal member is assembled integrally with said first seal member at a bonded base portion, said rubber seal lip extends obliquely from said bonded base portion axially towards a fluid to be sealed in a manner such that a diameter of said rubber seal lip is gradually reduced and a lip front portion of said rubber seal lip contacts a rotating shaft and a portion defined between said lip front portion and said bonded base portion is formed to be deformable in a direction of said diameter, and said resin seal lip extends from said bonded base portion axially towards said fluid to be sealed along an inner peripheral portion of said deformable portion between said lip front portion and said bonded base portion, so as to provide an enlarged annular space formed widely between said first seal member and said second seal member between said base portion and said seal lips with said rubber seal lip and said resin seal lip kept in a non-contacting state throughout the entire length of said resin seal lip; andsaid enlarged annular space formed between said inner peripheral portion of said deformable portion and said resin seal lip for preventing a contact between said deformable portion of said rubber seal lip and said resin seal lip;an inner peripheral portion of said rubber seal lip facing said enlarged annular space extending substantially parallel to said rotation shaft while a root portion of the rubber seal lip is bent inward;said outwardly bent first seal member and said inwardly bent second seal member providing an increase in said enlarged annular space, with the resin seal lip of the second seal member molded such that the diameter is reduced inwardly, and when the second seal member is mounted on the rotating shaft said diameter is widened so as to provide a gap between the resin seal lip of the second seal member and the rubber seal lip of the first seal member, so as to prevent interference of the resin seal lip of said second seal member with the rubber seal lip of said first seal member.