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. 20, 2020
Filed:
Mar. 22, 2017
Ntn Corporation, Osaka, JP;
Weida Yan, Kuwana, JP;
Kazumasa Seko, Kuwana, JP;
Michio Hori, Kuwana, JP;
Takashi Yamamoto, Kuwana, JP;
Naoya Hasegawa, Kuwana, JP;
NTN CORPORATION, Osaka, JP;
Abstract
A rolling bearing includes an inner ring, an outer ring, and rolling elements interposed between the inner ring and the outer ring. A surface layer portion, beneath a raceway surface (), of a base material of a raceway ring () which is the inner ring or the outer ring, is a wear-resistant layer () which has a higher hardness than a residual portion (), beneath the surface layer portion, of the base material, and includes a minute-recess-and-projection surface. An oxide film () is provided which has such a film thickness (t) as to fill recesses of the minute-recess-and-projection surface of the wear-resistant layer (), and includes recesses and projections existing along the minute-recess-and-projection surface, and the oxide film () coats the surface of the wear-resistant layer (). The oxide film () is made from a material more fragile than the wear-resistant layer () of the base material.