Piston and oil control ring therefor
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United States of America Patent
Stats
-
Apr 29, 1986
Grant Date -
N/A
app pub date -
Jan 15, 1979
filing date -
Jan 15, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A piston having a ring groove therearound has a three part oil control ring in the groove. The ring includes an axially and radially corrugated expander and two flat annular rails retained by the sides of the groove. The radial wall thickness of the rails is no more than 3% of the diameter of the piston; and the radial wall thickness of the expander is no more then 4.7% of the diameter of the piston.
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