Title:
ANTI-FRICTION BEARING
Document Type and Number:
WIPO Patent Application WO/2015/128973
Kind Code:
A1
Abstract:
An outer ring, an inner ring, and rolling elements are made of alloyed steel containing 0.8-1.2 mass% C, 0.1-0.7 mass% Si, 0.2-1.2 mass% Mn, and 0.9-1.8 mass% Cr. Hardened layers having a surface hardness of HRC 63-67 and a top surface hardness of Hv 950 or greater are formed by a carbonitriding treatment on the rolling elements, the N content of the rolling element surfaces is 0.08 to 0.68 mass%, and the amount of retained austenite is 15-35 vol%. From the surfaces of the rolling elements to a depth position equal to 1% of the diameter, the N content is 0.05 mass% or greater, the amount of retained austenite is 20-40 vol%, and the compressive residual stress is 500-900 MPa.
Inventors:
MORITO YUSUKE (JP)
UYAMA HIDEYUKI (JP)
YAMADA HIROKI (JP)
TSUTSUMI MASAKO (JP)
UYAMA HIDEYUKI (JP)
YAMADA HIROKI (JP)
TSUTSUMI MASAKO (JP)
Application Number:
PCT/JP2014/054748
Publication Date:
September 03, 2015
Filing Date:
February 26, 2014
Export Citation:
Assignee:
NSK LTD (JP)
International Classes:
F16C33/62; C10M105/18; C10M115/08; C10M125/02; C10M129/28; C10M133/12; C10M135/18; C10M137/10; C21D1/06; C21D9/40; C22C38/00; C22C38/22; F16C19/36; F16C33/66
Foreign References:
| JP2012229482A | 2012-11-22 | |||
| JP2009127114A | 2009-06-11 | |||
| JP2007217464A | 2007-08-30 | |||
| JP2006193646A | 2006-07-27 | |||
| JP2013221179A | 2013-10-28 | |||
| JP2011007234A | 2011-01-13 |
Attorney, Agent or Firm:
HAMADA Yuriko et al. (JP)
Yuriko Hamada (JP)
Yuriko Hamada (JP)
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