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One-piece composite lip seal

  • US 5,163,692 A
  • Filed: 07/15/1991
  • Issued: 11/17/1992
  • Est. Priority Date: 07/24/1989
  • Status: Expired due to Term
First Claim
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1. A composite one-piece lip seal for forming a dynamic ring seal between static and dynamic surfaces of relatively movable parts, the lip seal body being made of an elastomeric material, the seal having a relatively narrower radial low pressure end and a relatively wider radial high pressure end and a dynamic leg extending between the low pressure and high pressure ends to form the seal'"'"'s contact surface to said dynamic surface during use, the seal including spring means for energizing the dynamic leg of the seal in its sealing contact, the seal further including a reinforcing ring having an L-shaped cross-section integrally molded and bonded to the elastomeric body of the seal, the long leg of the L being relatively thin and of substantially uniform width and forming an exterior surface and an elastomer reinforcement means along at least one-half the length of the dynamic leg of the seal, the long leg of the L extending from the low pressure end of the seal to a location spaced less than about one-half the distance from the seal'"'"'s high-pressure end with the elastomeric body which extends beyond the end of the long leg of the L forming the contact surface on the dynamic leg of the seal continuously from the end of the reinforcing ring to the high pressure end of the seal, the reinforcing ring including a radial leg which extends inwardly a short distance along the low pressure end of the seal, the outer surface of the radial leg being flush with the surface of the low pressure end of the seal, said reinforcing ring being made from a fluorocarbon polymer having a lower coefficient of friction and a higher compressive modulus than the elastomer.

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