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:
Sep. 18, 2018
Filed:
Feb. 13, 2014
Honda Motor Co., Ltd., Tokyo, JP;
Takehiko Ooshiro, Kyoto, JP;
Koji Miyake, Kyoto, JP;
Satoshi Yoshida, Wako, JP;
Eishi Fujimagari, Wako, JP;
Takeyuki Yamasaki, Wako, JP;
Hidetoshi Chiba, Wako, JP;
HONDA MOTOR CO., LTD., Tokyo, JP;
Abstract
Provided are a piston ring which, even when a sleeve constituted of an aluminum alloy is used, can sufficiently show the required low frictional properties, wear resistance, and low counterpart-material attacking properties, and a process for producing the piston ring. The piston ring has a rigid carbon film formed as the outermost layer thereof and serving as a sliding surface with a sleeve constituted of an aluminum alloy, wherein the rigid carbon film gives an X-ray diffraction pattern that has peaks assigned to graphite crystals. The rigid carbon film of the piston ring is formed using a chemical vapor deposition method. The rigid carbon film of the piston ring has a hydrogen content which is at least 20 atm % but lower than 30 atm %, and gives a Raman spectrum in which the ratio of the area (ID) of D-band peaks to the area (IG) of G-band peaks, ID/IG, is 0.5-2.0.