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:
Apr. 14, 2020
Filed:
Jul. 29, 2016
Nippon Piston Ring Co., Ltd., Saitama-shi, Saitama-ken, JP;
Takuya Ozaki, Ichinoseki, JP;
Hiroyuki Sugiura, Ichinoseki, JP;
NIPPON PISTON RING CO., LTD, Saitama-shi, Saitama, JP;
Abstract
To provide a piston ring comprising a hard carbon film that is easy to form and exhibits excellent wear resistance. The above-described problem is solved by having a hard carbon filmformed on at least an outer peripheral sliding surfaceof a piston ring base material, wherein the hard carbon filmis a laminated film comprising a plurality of layers, and is configured so as to contain boron within a range of an atomic density of 0.2×10atoms/cmto 2.0×10atoms/cminclusive. This hard carbon filmmay be configured to have an spcomponent ratio within a range of 40% to 80% inclusive, measured in a TEM-EELS spectrum formed by combining electron energy loss spectroscopy (EELS) with a transmission electron microscope (TEM), and a hydrogen content within a range of 0.1 atom % to 5 atom % inclusive. Further, a total thickness of this hard carbon filmmay be configured to be within a range of 0.5 μm to 20 μm inclusive.