The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 03, 2005
Filed:
Oct. 10, 2003
Takahiro Hamada, Yokohama, JP;
Yutaka Mabuchi, Yokohama, JP;
Makoto Kano, Yokohama, JP;
Yoshiteru Yasuda, Yokohama, JP;
Yusuke Okamoto, Kanagawa, JP;
Takahiro Hamada, Yokohama, JP;
Yutaka Mabuchi, Yokohama, JP;
Makoto Kano, Yokohama, JP;
Yoshiteru Yasuda, Yokohama, JP;
Yusuke Okamoto, Kanagawa, JP;
Nissan Motor Co., Ltd., Yokohama, JP;
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/mm, 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/mm) of the film.