Stirling engine with improved piston ring assembly

Details Stirling engine with improved piston ring assembly Stirling engine with improved piston ring assembly

1984-10-29

1986-10-07

Michalsky, Gerald A.

Expansible chamber devices

Piston

With spring means for biasing side wall portion radially

277 26, 277 27, 277165, 277194, F16J 902

Patent

active

046152610

ABSTRACT:
An improved piston ring assembly, particularly for a Stirling engine, comprises a piston ring made from a TFE fluorocarbon such as Rulon which is disposed in a piston ring groove and is acted upon by an annular bi-metal element disposed between the groove and the ring. When the engine is cold, the bi-metal element urges the ring outwardly so that a flat radially outer surface of the ring is forced into face-to-face contact with the cylinder wall. When the engine has warmed up, the force of the element of the piston ring is relaxed and the thermal expansion of the piston ring maintains the outer surface of the ring in face-to-face contact with the cylinder wall.

REFERENCES:
patent: 1761808 (1930-06-01), Weaver
patent: 2857184 (1958-10-01), Mancusi
patent: 4132417 (1979-01-01), Lagerqvist

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