Title:
ROLLING BEARING AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2013/084800
Kind Code:
A1
Abstract:
The present invention is provided with a step for cooling a furnace and maintaining a rolling bearing component at 620-700°C for a predetermined length of time prior to quenching and tempering treatments following a carburizing or carbonitriding treatment. The amount of C+N at a contact surface of the rolling bearing component, which uses an alloy steel containing appropriate amounts of Cr and Mo, is 0.9-1.4 mass%, and the area ratio of carbide is 10% or less. A depth of 1% of a rolling body diameter from the contact surface has a hardness of Hv 720 to Hv 832, a residual amount of austenite of 20-45 vol%, and a compressive residual stress of 50-300 MPa. A depth of 1-3% of the rolling body diameter from the contact surface has a mean value of the prior austenite grain size of 20 μm or less and a maximum value of the prior austenite grain size of at most three-fold the mean value, and the core hardness is Hv 400-550.
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Inventors:
YAMADA HIROKI
UYAMA HIDEYUKI
TSUTSUMI MASAKO
MORITO YUSUKE
UYAMA HIDEYUKI
TSUTSUMI MASAKO
MORITO YUSUKE
Application Number:
PCT/JP2012/080995
Publication Date:
June 13, 2013
Filing Date:
November 29, 2012
Export Citation:
Assignee:
NSK LTD (JP)
YAMADA HIROKI
UYAMA HIDEYUKI
TSUTSUMI MASAKO
MORITO YUSUKE
YAMADA HIROKI
UYAMA HIDEYUKI
TSUTSUMI MASAKO
MORITO YUSUKE
International Classes:
C22C38/00; C21D1/06; C21D9/40; C22C38/44; F16C19/04; F16C33/62; F16C33/64
Domestic Patent References:
| WO2005068675A1 | 2005-07-28 |
Foreign References:
| JP2010196107A | 2010-09-09 | |||
| JP2005273759A | 2005-10-06 | |||
| JP2012031457A | 2012-02-16 | |||
| JP2002327758A | 2002-11-15 | |||
| JP2003106338A | 2003-04-09 | |||
| JP2005314794A | 2005-11-10 | |||
| JP2010196107A | 2010-09-09 |
Other References:
See also references of EP 2789709A4
Attorney, Agent or Firm:
HAMADA Yuriko et al. (JP)
Yuriko Hamada (JP)
Yuriko Hamada (JP)
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Claims: