Valve lifter
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United States of America Patent
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-
Jan 2, 2007
Grant Date -
Sep 21, 2006
app pub date -
Feb 1, 2006
filing date -
Feb 2, 2005
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A valve lifter, in which an amorphous hard carbon film is coated at least on the surface that slides against a cam, is characterized in that the surface of a base material (substrate) has an arithmetic mean roughness of Ra 0.01 to 0.03 micrometers, and the maximum length of the scratch on the base surface is made to be equal to or shorter than 250 micrometers.
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