OIL RING MECHANISM OF A PISTON
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United States of America Patent
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Issued Date -
Mar 15, 2012
app pub date -
Mar 30, 2010
filing date -
May 22, 2009
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
An oil ring mechanism of a piston includes a circumferential ring groove formed in an outer peripheral surface of the piston, and a two-piece oil ring having a ring-shaped ring main body that is arranged in the ring groove and urged in the outer peripheral direction inside the ring groove by a coil expander arranged on the inner peripheral side of the oil ring main body. On lower side surface on a crankcase side of a side wall surface of the ring groove that is on the opposite side of the ring groove from an engine combustion chamber, first and second recessed portions that reduce the abutment area where a lower surface of the ring main body abuts against the lower side surface formed in a lower side abutment surface that serves as a surface for abutting against the lower surface of the ring main body.
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