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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 9249476 B1

PDFFull Text
Date of Patent:
Feb. 02, 2016

Filed:

Aug. 07, 2013

Rolling bearing

Applicant:

Nsk Ltd., Tokyo, JP;

Inventors:

Hideyuki Hidaka, Fujisawa, JP;

Daisuke Watanuki, Fujisawa, JP;

Kazuki Tamura, Fujisawa, JP;

Assignee:

NSK LTD., Tokyo, JP;

Attorney:

Sughrue Mion, PLLC

Primary Examiner:

Phillip A Johnson

Int. Cl.
CPC ...
F16C 33/62 (2006.01); F16C 33/64 (2006.01); C21D 9/40 (2006.01); C22C 38/00 (2006.01); C22C 38/44 (2006.01); F16C 33/58 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); F16C 19/26 (2006.01); F16C 19/38 (2006.01); F16C 19/36 (2006.01); C21D 1/09 (2006.01);
U.S. Cl.
CPC ...
C21D 9/40 (2013.01); C22C 38/00 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/44 (2013.01); F16C 33/585 (2013.01); F16C 33/62 (2013.01); F16C 33/64 (2013.01); C21D 1/09 (2013.01); F16C 19/26 (2013.01); F16C 19/364 (2013.01); F16C 19/38 (2013.01); F16C 2202/04 (2013.01); F16C 2240/40 (2013.01);
Abstract

In the rolling bearing of the present invention, at least one of the bearing rings is obtained by applying a induction heat treatment to a spheroidizing annealed steel material having a DI value of 1.0 or more to form a hardened layer having a hardness of 550 HV or more on at least a raceway surface and a fitting surface, and in the induction heat-treated bearing ring, (A) an average retained austenite amount is 12 vol % or less, (B) the raceway surface has a retained austenite amount of 12 vol % or more and a residual compressive stress of −100 MPa or less, and (C) a difference between a hardness of the raceway surface and a minimum hardness of a region having a hardness of less than 550 HV is 150 HV or more.

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