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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 10718377 B1

PDFFull Text
Date of Patent:
Jul. 21, 2020

Filed:

Oct. 12, 2016

Method for producing bearing ring, double row tapered roller bearing, and method for producing double row tapered roller bearing

Applicant:

Ntn Corporation, Osaka-shi, Osaka, JP;

Inventors:

Michio Hori, Mie, JP;

Hideto Torisawa, Mie, JP;

Hiroshi Yuki, Mie, JP;

Chikara Ohki, Mie, JP;

Kazuhiro Yagita, Mie, JP;

Assignee:

NTN CORPORATION, Osaka, JP;

Attorney:

McDermott Will & Emery LLP

Primary Examiner:

Marcus Charles

Int. Cl.
CPC ...
F16C 19/38 (2006.01); C21D 9/40 (2006.01); C21D 1/42 (2006.01); C22C 38/22 (2006.01); C21D 6/00 (2006.01); C22C 38/04 (2006.01); C21D 1/10 (2006.01); C22C 38/02 (2006.01); C21D 1/28 (2006.01); F16C 33/62 (2006.01); F16C 33/64 (2006.01); C22C 38/44 (2006.01); C22C 38/00 (2006.01); C21D 1/18 (2006.01); F16C 37/00 (2006.01); F16C 33/58 (2006.01); C22C 38/12 (2006.01); C22C 38/08 (2006.01);
U.S. Cl.
CPC ...
F16C 19/385 (2013.01); C21D 1/10 (2013.01); C21D 1/18 (2013.01); C21D 1/28 (2013.01); C21D 1/42 (2013.01); C21D 6/002 (2013.01); C21D 6/005 (2013.01); C21D 6/008 (2013.01); C21D 9/40 (2013.01); C22C 38/00 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/22 (2013.01); C22C 38/44 (2013.01); F16C 19/386 (2013.01); F16C 33/585 (2013.01); F16C 33/64 (2013.01); F16C 37/007 (2013.01); C21D 2221/00 (2013.01); C22C 38/08 (2013.01); C22C 38/12 (2013.01); F16C 33/62 (2013.01); F16C 2223/18 (2013.01); F16C 2300/14 (2013.01); F16C 2360/31 (2013.01); Y02P 10/253 (2015.11);
Abstract

There is prepared a formed body constituted of steel and having an outer circumferential surface having an annular groove having a bottom surface to serve as a raceway surface of the bearing ring. In the step of forming a heated region, the formed body is induction heated to form a heated region including the bottom surface of the groove and heated to a temperature of at least an Apoint. In the cooling step, the whole of the heated region is simultaneously cooled to a temperature of not more than an Mpoint. The step of retaining the formed body in a state in which heating is stopped is performed after the step of forming a heated region before the step of cooling. In the step of retaining, dispersion in temperature in the heated region in the circumferential direction is suppressed to not more than 20° C.

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