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:
Oct. 29, 2019
Filed:
Aug. 10, 2015
Nippon Itf, Inc., Kyoto, JP;
Honda Motor Co., Ltd., Tokyo, JP;
Takehiko Ooshiro, Kyoto, JP;
Koji Miyake, Kyoto, JP;
Masanori Tsujioka, Kyoto, JP;
Satoshi Yoshida, Saitama, JP;
NIPPON ITF, INC., Kyoto, JP;
Honda Motor Co., Ltd., Tokyo, JP;
Abstract
Provided is a piston ring having excellent low-friction properties and abrasion resistance manufactured without the need for precision control using an ordinary film formation device that does not have a special function. A piston ring obtained by coating an amorphous carbon film on the surface of a ring-shaped substrate, the piston ring being configured so that the amorphous carbon film is formed by CVD, an increase region, in which the ratio sp/spof the spbond to the spbond continuously increases from the substrate surface toward the film surface, and a decrease region, in which the ratio sp/spcontinuously decreases, are formed in alternating fashion, a soft film in which the ratio sp/spis low and a hard film in which the ratio sp/spis high are formed so as to be layered in alternating fashion by continuous variation of the ratio sp/spin the boundary between the increase region and the decrease region, and the decrease regions are formed in equal number to or with one region less than the number of increase regions.