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piston ring
Definição1
Metal rings, usually made of cast iron, that fit into grooves around the outside of a reciprocating-engine piston. Piston rings form a seal between the piston and the cylinder wall to prevent the high-pressure air in the cylinder from leaking out.
Fonte1
CRANE, Dale (ed.). Dictionary of aeronautical terms. 2nd ed. Renton: ASA, 1991.
Definição2
Precision-ground abrasion-resistant ring fitted in groove around piston to make spring-tight fit against cylinder (see gas ring, junk ring, obturator ring, oil-scraper ring).
Fonte2
GUNSTON, Bill. The Cambridge aerospace dictionary. Cambridge: Cambridge University, 2004. vii, 740 p. (Cambridge aerospace series.)
Subárea
Engine
Français
segment de piston
Imagem

 Horizontal steam engine. The piston is shown at D. The three piston rings prevent steam from escaping between chambers A and B.

Horizontal steam engine. The piston is shown at D. The three piston rings prevent steam from escaping between chambers A and B.

Fonte: http://en.wikipedia.org/wiki/File:Horizontal_steam_engine.png