Piston ring assembly
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United States of America Patent
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Apr 8, 1997
Issued Date -
N/A
app pub date -
Mar 15, 1993
filing date -
Nov 25, 1991
priority date (Note) -
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status (Latency Note)
Importance
Abstract
A piston ring assembly comprises a piston ring, a spring for providing an outward force on the ring, and a rail for engaging a cylinder wall. The piston ring is retained in a piston groove in a piston. During upward movement of the piston in a cylinder, oil above the ring face is forced between the first front surface and the top surface into the piston groove to an inner portion of the piston groove. During downward movement of the piston, the downward force urges cocking of the piston ring about the ring face to tilt the ring face away from the cylinder wall, leaving the lower front of the ring face in scraping abutment with the cylinder wall.
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