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:
Mar. 10, 2009
Filed:
Apr. 14, 2004
Takahiro Hamada, Yokohama, JP;
Yutaka Mabuchi, Yokohama, JP;
Makoto Kano, Yokohama, JP;
Yuuji Azuma, Yokohama, JP;
Takahiro Hamada, Yokohama, JP;
Yutaka Mabuchi, Yokohama, JP;
Makoto Kano, Yokohama, JP;
Yuuji Azuma, Yokohama, JP;
Nissan Motor Co., Ltd., Yokohama-shi, JP;
Abstract
A fuel injection valve for an automotive internal combustion engine comprises a needle valve and an opposite member which are in slidable contact with each other in presence of fuel. A hard carbon thin film is coated on at least one of the sliding sections of the base materials of the needle valve and the opposite member. The hard carbon thin film has a surface hardness ranging from 1500 to 4500 kg/mmin Knoop hardness, a film thickness ranging from 0.3 to 2.0 μm, and a surface roughness (Ry) (μm) which satisfies a relationship represented by the following formula (A):(0.75−8000)×0.0875  (A) where h is the thickness (μm) of the hard carbon thin film; Hk is the surface hardness in Knoop hardness (kg/mm) of the hard carbon thin film.