Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Yutaka Mabuchi0
Takahiro Hamada0
Takashi Matsui0
Tomoyuki Koike0
Hiroyuki Izumi0
Katsuhiro Tsuji0
Masaki Moronuki0
Date of Patent
January 2, 2007
0Patent Application Number
113456060
Date Filed
February 1, 2006
0Patent Primary Examiner
Patent 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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