Piston ring and cylinder liner combination
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United States of America Patent
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Oct 5, 1999
Grant Date -
N/A
app pub date -
Dec 24, 1997
filing date -
Dec 26, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An outer circumferential surface of a piston ring is covered with a physical vapor deposition film, chemical vapor deposition film or composite chromium plating film. The physical vapor deposition film or chemical vapor deposition film consists of chromium or titanium nitrides (for instance CrN, Cr.sub.2 N, a mixture of Cr and Cr.sub.2 N, TiN) or carbides (for instance CrC, TiC). The composite chromium plating film contains carbides (for instance SiC) or nitrides (for instance Si.sub.3 N.sub.4) or oxides (for instance Al.sub.2 O.sub.3) in cracks in the film. A cylinder liner is made of spheroidal graphite cast iron.
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