Piston seal

Details Piston seal Piston seal

1977-04-27

1980-12-23

Smith, Robert I.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277197, 92182, F16J 902

Patent

active

042406447

ABSTRACT:
A piston seal having two spring tensioned rings which are biased radially toward the cylinder wall and seated in the uppermost one of the ring groove in the piston head. The upper ring has a relatively small and constant thickness of between 0.005 and 0.030 inches and includes a radially extending base seated in the ring groove and an axially extending flange forming an obtuse angle of between 98 and 101 degrees with the base and extending outwardly of the piston head such that fluid under pressure in the cylinder flexes the flange into sealing contact with the cylinder wall. The lower ring functions as a standard compression ring and also supports the thin upper flex ring. The upper flex ring has a predetermined size opening in the base which is aligned with the gap in the compression support ring to provide a controlled "blow-by" to minimize oil reservoiring below the rings caused by the more effective seal.

REFERENCES:
patent: 2836252 (1958-05-01), Lane
patent: 2900213 (1959-08-01), Bruce
patent: 3806134 (1974-04-01), Schexnader
patent: 3991455 (1976-11-01), Bergeron
patent: 4121838 (1978-10-01), Sakamaki

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