Internal-combustion engines – Particular piston and enclosing cylinder construction – Piston
Reexamination Certificate
2005-05-03
2005-05-03
McMahon, Marguerite (Department: 3747)
Internal-combustion engines
Particular piston and enclosing cylinder construction
Piston
C427S450000
Reexamination Certificate
active
06886521
ABSTRACT:
A sliding structure for an automotive engine includes a sliding member with a sliding portion and a lubricant applied to the sliding portion so that the sliding portion can make sliding contact with a counterpart member via the lubricant. The sliding member is either of a piston ring, a piston pin, a cam lobe, a cam journal, a plain bearing, a rotary vane and a timing chain. The sliding portion has a base made of a steel or aluminum material and a hard carbon film formed on the base to coat the sliding portion. The hard carbon film has a thickness of 0.3 to 2.0 μm, a Knoop hardness of 1500 to 4500 kg/mm2, a surface roughness Ry (μm) satisfying the following equation: Ry<{(0.75−Hk/8000)×h+0.07/0.8}, where h is the thickness (μm) of the film; and Hk is the Knoop hardness (kg/mm2) of the film.
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“Chromium Steels”, Japanese Industrial Standard, 1979, pp. 1-9, JIS G 4104, Japanese Standards Association, Japan.
Hamada Takahiro
Kano Makoto
Mabuchi Yutaka
Okamoto Yusuke
Yasuda Yoshiteru
McMahon Marguerite
Nissan Motor Co,. Ltd.
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