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:
Dec. 10, 2024
Filed:
Dec. 05, 2018
Applicant:
Ntn Corporation, Osaka, JP;
Inventors:
Masahiro Yamada, Kuwana, JP;
Chikara Ohki, Kuwana, JP;
Assignee:
NTN CORPORATION, Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16C 33/62 (2006.01); C21D 1/06 (2006.01); C21D 9/36 (2006.01); C21D 9/40 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/44 (2006.01); C23C 8/32 (2006.01); C23C 8/80 (2006.01);
U.S. Cl.
CPC ...
F16C 33/62 (2013.01); C21D 1/06 (2013.01); C21D 9/36 (2013.01); C21D 9/40 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/44 (2013.01); C23C 8/32 (2013.01); C23C 8/80 (2013.01); C21D 2211/008 (2013.01); F16C 2204/70 (2013.01);
Abstract
A bearing part according to one embodiment of the present invention is a bearing part composed of a chromium molybdenum steel, the bearing part including a diffusion layer in a surface of the bearing part. The diffusion layer includes a plurality of compound grains and a plurality of martensite blocks. An average grain size of the compound grains is less than or equal to 0.3 μm. An area ratio of the compound grains in the diffusion layer is more than or equal to 3%. A maximum grain size of the plurality of martensite blocks is less than or equal to 3.8 μm.