Combination of piston and piston ring
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United States of America Patent
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Apr 11, 2006
Issued Date -
N/A
app pub date -
Aug 26, 2003
filing date -
Aug 30, 2002
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A combination of piston and piston ring includes a piston having a piston ring groove in which at least the groove portion of the piston is made of steel, a piston ring made of cast iron and fitted into the piston ring groove, and a hard coat film formed to at least an outer peripheral sliding surface of the piston ring.
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