Chain drive system
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United States of America Patent
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Aug 11, 2009
Grant Date -
Feb 17, 2005
app pub date -
Aug 10, 2004
filing date -
Aug 13, 2003
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A chain drive system includes a drive sprocket, a driven sprocket and a chain looped over the drive sprocket and the driven sprocket. The chain and the sprocket having respective sliding surfaces slidable relative to each other in the presence of lubricating oil, and any adjacent chain components of the chain having respective sliding surfaces slidable relative to each other in the presence of lubricating oil. At least one of the sliding surfaces between the chain and the sprocket and at least one of the sliding surfaces between any adjacent chain components have hard carbon coatings formed on base portions thereof. Each of the hard carbon coatings has a hydrogen content of 10 atomic % or less.
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