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Seal ring

  • US 4,185,842 A
  • Filed: 07/10/1978
  • Issued: 01/29/1980
  • Est. Priority Date: 07/08/1977
  • Status: Expired due to Term
First Claim
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1. In a gapped composite seal ring for a Stirling engine of the type having a main seal ring with an annular recess formed in the outer periphery thereof opposite the high pressure side of said main seal ring to form an L-shaped cross-section, and an auxiliary seal ring fitted into said annular recess, said composite ring sealing the clearance gap between the outer periphery of a piston and the inner periphery of a cylinder, the improvement comprising:

  • said main and auxiliary seal rings being made of thermoplastic or thermosetting synthetic resin, the axial thickness of the thin wall portion of the main seal ring being substantially between one-half and three-fourths the axial thickness of the entire composite ring and the radial width of said auxiliary seal ring being at least twice as large as said clearance gap and less than four-fifths of the radial width of the entire composite seal ring.

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