MACHINE PART, ROLLING BEARING, CONICAL ROLLER BEARING AND METHOD FOR MANUFACTURING MACHINE PART

Title:

MACHINE PART, ROLLING BEARING, CONICAL ROLLER BEARING AND METHOD FOR MANUFACTURING MACHINE PART

Document Type and Number:

WIPO Patent Application WO/2013/084864

Kind Code:

A1

Abstract:

An outer ring (11), an inner ring (12) and a ball (13), each being a machine part, formed of a steel which comprises 0.60-1.50 mass% inclusive of carbon, 0.15-2.50 mass% inclusive of silicon, 0.30-1.50 mass% inclusive of manganese, 0.20-2.00 mass% inclusive of chromium and the balance impurities, wherein: the nitrogen concentrations in surface parts (11B, 12B, 13B) under an outer ring rolling surface (11A), an inner ring rolling surface (12A) and a ball rolling surface (13A), each rolling surface being a contact surface that is to be in contact with another part, are each 0.3 mass% or more; and the overall average contents of retained austenite in the outer ring (11), the inner ring (12) and the ball (13) are each 20 vol% or less.

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Inventors:

SATO DAISUKE (JP)
OHKI CHIKARA (JP)
UENO TAKASHI (JP)
KUSUMI YASUTAKA (JP)

Application Number:

PCT/JP2012/081337

Publication Date:

June 13, 2013

Filing Date:

December 04, 2012

Export Citation:

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Assignee:

NTN TOYO BEARING CO LTD (JP)
SATO DAISUKE (JP)
OHKI CHIKARA (JP)
UENO TAKASHI (JP)
KUSUMI YASUTAKA (JP)

International Classes:

C21D1/06; C21D9/40; C22C38/00; C22C38/18; C22C38/44; F16C19/36; F16C33/32; F16C33/34; F16C33/58; F16C33/62; F16C33/64; F16C33/66

Foreign References:

JP2004225743A	2004-08-12
JP2011220357A	2011-11-04
JP2000212721A	2000-08-02
JP2009215597A	2009-09-24
JPS5118336A	1976-02-13

Other References: