Invention Grant
- Patent Title: Rolling bearing
- Patent Title (中): 滚动轴承
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Application No.: US14439016Application Date: 2013-08-07
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Publication No.: US09249476B2Publication Date: 2016-02-02
- Inventor: Hideyuki Hidaka , Daisuke Watanuki , Kazuki Tamura
- Applicant: NSK LTD.
- Applicant Address: JP Tokyo
- Assignee: NSK LTD.
- Current Assignee: NSK LTD.
- Current Assignee Address: JP Tokyo
- Agency: Sughrue Mion, PLLC
- Priority: JP2012-238231 20121029; JP2012-241822 20121101; JP2012-241823 20121101; JP2013-151873 20130722; JP2013-152358 20130723
- International Application: PCT/JP2013/071421 WO 20130807
- International Announcement: WO2014/069068 WO 20140508
- Main IPC: F16C33/62
- IPC: F16C33/62 ; F16C33/64 ; C21D9/40 ; C22C38/00 ; C22C38/44 ; F16C33/58 ; C22C38/02 ; C22C38/04 ; F16C19/26 ; F16C19/38 ; F16C19/36 ; C21D1/09

Abstract:
In the rolling bearing of the present invention, at least one of the bearing rings is obtained by applying a induction heat treatment to a spheroidizing annealed steel material having a DI value of 1.0 or more to form a hardened layer having a hardness of 550 HV or more on at least a raceway surface and a fitting surface, and in the induction heat-treated bearing ring, (A) an average retained austenite amount is 12 vol % or less, (B) the raceway surface has a retained austenite amount of 12 vol % or more and a residual compressive stress of −100 MPa or less, and (C) a difference between a hardness of the raceway surface and a minimum hardness of a region having a hardness of less than 550 HV is 150 HV or more.
Public/Granted literature
- US20150259764A1 ROLLING BEARING Public/Granted day:2015-09-17
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