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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 11162152 B1

PDFFull Text
Date of Patent:
Nov. 02, 2021

Filed:

Dec. 20, 2017

Bearing bushing for track, and method for producing the same

Applicant:

Komatsu Ltd., Tokyo, JP;

Inventors:

Yusuke Kondo, Tokyo, JP;

Kazuo Maeda, Tokyo, JP;

Eiji Amada, Tokyo, JP;

Assignee:

KOMATSU LTD., Tokyo, JP;

Attorney:

Oliff PLC

Primary Examiner:

Marcus Charles

Int. Cl.
CPC ...
C21D 9/40 (2006.01); F16C 17/02 (2006.01); B23P 15/00 (2006.01); B62D 55/21 (2006.01); C21D 1/18 (2006.01); C22C 38/32 (2006.01); C21D 1/10 (2006.01); C22C 38/22 (2006.01); C22C 38/04 (2006.01); C22C 38/02 (2006.01); C22C 38/00 (2006.01); C21D 6/00 (2006.01); F16C 33/06 (2006.01);
U.S. Cl.
CPC ...
C21D 9/40 (2013.01); B23P 15/003 (2013.01); B62D 55/21 (2013.01); C21D 1/10 (2013.01); C21D 1/18 (2013.01); C21D 6/002 (2013.01); C21D 6/005 (2013.01); C21D 6/008 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/22 (2013.01); C22C 38/32 (2013.01); F16C 17/02 (2013.01); F16C 33/06 (2013.01); C21D 2221/00 (2013.01); F16C 2202/04 (2013.01); F16C 2326/20 (2013.01);
Abstract

A bearing bushing for a track has an annular shape including an inner peripheral surface, an outer peripheral surface, a first end face, and a second end face located axially opposite the first end face. The bearing bushing for a track includes an inner peripheral surface-side hardened layer formed to include the inner peripheral surface, an outer peripheral surface-side hardened layer formed to include the outer peripheral surface, a first end face-side hardened layer formed to include the first end face and having a region with a hardness of 63 HRC or more that has a thickness of 3 mm or more from the first end face, and an unhardened region lower in hardness than the inner peripheral surface-side hardened layer, the outer peripheral surface-side hardened layer, and the first end face-side hardened layer, and including at least the second end face. The bearing bushing is made of steel.

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