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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.:

US 10094422 B1

PDFFull Text
Date of Patent:
Oct. 09, 2018

Filed:

May. 28, 2014

Bearing component and rolling bearing

Applicant:

Ntn Corporation, Osaka, JP;

Inventors:

Chikara Ohki, Kuwana, JP;

Yukio Matsubara, Kuwana, JP;

Daisuke Sato, Kuwana, JP;

Assignee:

NTN CORPORATION, Osaka, JP;

Attorney:

McDermott Will & Emery LLP

Primary Examiner:

Archene A Turner

Int. Cl.
CPC ...
F16C 33/62 (2006.01); C21D 9/40 (2006.01); C23C 8/32 (2006.01); C22C 38/00 (2006.01); C22C 38/18 (2006.01); F16C 33/32 (2006.01); F16C 33/34 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/20 (2006.01); C22C 38/22 (2006.01); C22C 38/42 (2006.01); C22C 38/44 (2006.01); C21D 9/38 (2006.01); C21D 1/76 (2006.01); C21D 1/06 (2006.01);
U.S. Cl.
CPC ...
F16C 33/62 (2013.01); C21D 9/38 (2013.01); C21D 9/40 (2013.01); C22C 38/00 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/18 (2013.01); C22C 38/20 (2013.01); C22C 38/22 (2013.01); C22C 38/42 (2013.01); C22C 38/44 (2013.01); C23C 8/32 (2013.01); F16C 33/32 (2013.01); F16C 33/34 (2013.01); C21D 1/06 (2013.01); C21D 1/76 (2013.01); C21D 2211/004 (2013.01); F16C 2204/64 (2013.01); F16C 2204/70 (2013.01); F16C 2223/16 (2013.01);
Abstract

A bearing component composed of steel which contains carbon not less than 0.95 mass % and not more than 1.1 mass %, silicon less than 0.3 mass %, manganese less than 0.5 mass %, sulfur less than 0.008 mass %, and chromium not less than 1.4 mass % and less than 1.6 mass % and is composed of remainder iron and an impurity and having a carbonitrided layer formed at a surface portion is provided. An average concentration of nitrogen in the surface portion is not lower than 0.3 mass % and not higher than 0.6 mass % and variation in nitrogen concentration is not higher than 0.1 mass %. An amount of retained austenite is not greater than 8 volume %. An area ratio of a precipitate in the inside where no carbonitrided layer is formed is not lower than 11%.

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