Piston ring having a non-uniform radial pressure distribution

Details Piston ring having a non-uniform radial pressure distribution Piston ring having a non-uniform radial pressure distribution

1992-12-04

1995-01-10

Cuchlinski, Jr., William A.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277138, F16J 1532

Patent

active

053800184

ABSTRACT:
A piston ring has a gap defined by ring gap faces oriented toward one another and a nominal outer radius assumed by the piston ring in a closed position in which the piston ring is in an installed state in an engine cylinder having a radius equalling the nominal outer radius of the piston ring. The piston ring has first length portions extending from both ring gap faces and having a central angle of at least 15.degree. and less than 25.degree. and second length portions immediately adjoining each respective first length portion and having a central angle of approximately 10.degree.. In the installed state the first length portions have a radius of curvature equalling the nominal outer radius and the radius of curvature of the second length portions is smaller than the nominal outer radius. By virtue of such a ring configuration, a radial pressure distribution of the piston ring in the installed state is substantially zero at the ring gap and increases in opposite directions from the ring gap to a maximum value in the second length portions. The maximum value is in excess of 200% of an average circumferential radial pressure distribution of the piston ring in the installed state.

REFERENCES:
patent: 1321539 (1919-11-01), Mummert
patent: 1406475 (1922-02-01), Morgal
patent: 1654736 (1928-01-01), Kistner
Mierbach et al., "Heat Flow Through Piston Rings and Its Influence on Shape", SAE Technical Papers Series, 831283, Sep. 12-15, 1983, pp. 25-37.

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