Engine piston-pin sliding structure
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United States of America Patent
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Jun 12, 2007
Grant Date -
Dec 30, 2004
app pub date -
May 13, 2004
filing date -
Jun 6, 2003
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An engine piston-pin sliding structure includes a piston pin slidably engaged into a pin boss of an engine piston and having a base and a hard carbon coating formed on the base so as to define a sliding surface slidable over a bearing surface of the pin boss and a lubricant interposed between the sliding surface of the piston pin and the bearing surface of the pin boss. The hard carbon coating contains 25 atomic % or less of hydrogen, and the lubricant contains at least one of an ashless fatty-ester friction modifier and an ashless aliphatic-amine friction modifier.
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