Multi-layered thermal insulating piston cap
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United States of America Patent
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-
Sep 5, 1989
Issued Date -
N/A
app pub date -
Sep 19, 1988
filing date -
Nov 23, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A multi-layered insulating piston cap for cast metal pistons having an insulating, perforated metal sheet layer. A piston cap is provided having a top sheet continuous layer made of a heat and corrosion resistant metal for protecting the piston cap, a second layer made of heat and corrosion resistant metal sheet having a plurality of spaced apart perforations for providing trapped air spaces, a third layer made of a heat and corrosion resistant metal foil for sealing the perforations, and a fourth layer or porous, heat and corrosion resistant metal for anchoring the piston cap to the piston. One coined geometry can be used when blanking various sized cross-sections of piston cap.
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