Title:
ROLLING BEARING
Document Type and Number:
WIPO Patent Application WO/2014/069068
Kind Code:
A1
Abstract:
In this rolling bearing, at least one of the bearing rings is obtained by forming a hardened layer with a hardness of 550 HV or more on at least the raceway surface and the fitting surface by high frequency heat treatment of a steel material with a DI value of 1.0 or more that has undergone spheroidizing annealing. Moreover, in the high frequency heat-treated bearing ring, (A) mean residual austenite is 12 volume% or less, (B) residual austenite of the raceway surface is 12 volume% or more and the residual compressive stress is -100 MPa or less, and (C) the difference between the hardness of the raceway surface and the minimum hardness of the region having a hardness less than 550 HV is 150 HV or more.
Inventors:
HIDAKA HIDEYUKI
WATANUKI DAISUKE
TAMURA KAZUKI
WATANUKI DAISUKE
TAMURA KAZUKI
Application Number:
PCT/JP2013/071421
Publication Date:
May 08, 2014
Filing Date:
August 07, 2013
Export Citation:
Assignee:
NSK LTD (JP)
HIDAKA HIDEYUKI
WATANUKI DAISUKE
TAMURA KAZUKI
HIDAKA HIDEYUKI
WATANUKI DAISUKE
TAMURA KAZUKI
International Classes:
F16C33/64; C21D9/40; C22C38/00; C22C38/44; F16C19/02; F16C19/22; F16C33/32; F16C33/34; F16C33/62
Foreign References:
| JP2012162799A | 2012-08-30 | |||
| JP2004011712A | 2004-01-15 | |||
| JPH10226817A | 1998-08-25 | |||
| JP2009270172A | 2009-11-19 | |||
| JP4208426B2 | 2009-01-14 |
Other References:
See also references of EP 2913548A4
Attorney, Agent or Firm:
HAMADA Yuriko et al. (JP)
Yuriko Hamada (JP)
Yuriko Hamada (JP)
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