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Thermally insulated piston

  • US 4,604,945 A
  • Filed: 03/07/1985
  • Issued: 08/12/1986
  • Est. Priority Date: 12/30/1983
  • Status: Expired due to Term
First Claim
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1. A piston comprising:

  • (a) a cap portion having an inner planar surface and(b) a body portion having a recess for receiving said cap portion, said recess having a first surface opposing said inner planar surface of said cap portion and,(c) an interlayer between said inner planar surface of said cap and said first surface of said body portion, said interlayer having an outer knife edge, said cap portion and said interlayer being bonded together by a first brazing alloy, said interlayer and said body portion being bonded together by a combination of a second brazing alloy bonding said interlayer to a steel disc and a third brazing alloy bonding said steel disc to said body portion wherein said body portion has a cellular portion adjacent to said interlayer comprised of cells filled with a thermal insulating material.

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