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:
Aug. 20, 2019
Filed:
Jun. 30, 2015
Nippon Piston Ring Co., Ltd, Saitama-shi, Saitama, JP;
Noriaki Chida, Ichinoseki, JP;
Masataka Okano, Ichinoseki, JP;
NIPPON PISTON RING CO., LTD, Saitama-shi, Saitama, JP;
Abstract
Provided is a piston ring () comprising a sliding surface () covered with a Cr—B—V—N alloy film (), wherein a B content is within a range of 0.1-1.5 mass % inclusive, a V content is within a range of 0.05-1 mass % inclusive, and a ratio [B content/V content] is within a range greater than 1 and 30 or less, thereby achieving a piston ring () having higher wear resistance, cracking resistance, and peeling resistance. This alloy film () preferably further includes Ti, the Ti content being within a range greater than 0 mass % and 8 mass % or less. Such a piston ring () is preferably mounted on an engine that uses an alcohol fuel or an alcohol-containing fuel.