Valve lifter and surface treatment method thereof
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United States of America Patent
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Feb 7, 2012
Grant Date -
Jan 21, 2010
app pub date -
Nov 5, 2008
filing date -
Jul 18, 2008
priority date (Note) -
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Abstract
The present invention provides a valve lifter, including a buffer layer, a Me diamond-like carbon layer having a thickness of 0.3˜0.6 μm, and a diamond-like carbon layer having a thickness of 1˜1.5 μm and a SP3 bonding fraction of 60˜70%, which are sequentially formed on a base body which is subjected to carbonitriding treatment. The valve lifter can exhibit superior low-friction characteristics and wear resistance.
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