Valve train for internal combustion engine
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United States of America Patent
Stats
-
Dec 12, 2006
Grant Date -
Mar 17, 2005
app pub date -
Aug 6, 2004
filing date -
Aug 8, 2003
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A valve train for an internal combustion engine is comprised of a lubricating oil, and a camshaft which is made of an iron-based material and comprises a cam lobe and a camshaft journal. The camshaft slidingly moves on a counterpart thereof through the lubricating oil. A hard carbon film is formed on at least one of a sliding portion of the camshaft and the counterpart made of an iron-based material. A hydrogen amount of the hard carbon film is 10 atomic percent or less.
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