Piston and piston ring assemblies

Details Piston and piston ring assemblies Piston and piston ring assemblies

1985-01-14

1987-06-02

Look, Edward K.

Expansible chamber devices

With lubricating means

Piston has lubricant retaining or conducting means

92193, 92198, 123193P, F01B 3110

Patent

active

046693696

ABSTRACT:
A two ring piston and piston ring assembly has an upper thin steel compression ring and a lower ring which is thicker than the compression ring and which acts both as a compression ring and an oil control ring. The lower piston ring is made of a material which is more conformable than steel, for example a plastics material, which may be reinforced. In this way, effective sealing is provided using only two piston rings, while the frictional forces between the piston and an associated cylinder are reduced.

REFERENCES:
patent: 2200015 (1940-05-01), Alexandrescu
patent: 2656228 (1953-10-01), Marien
patent: 2857218 (1958-10-01), Pachernegg
patent: 3759148 (1973-09-01), Geffroy
patent: 3926095 (1975-12-01), Weigle
patent: 4516481 (1985-05-01), Geffroy et al.

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