Title:
ROLLING BEARING
Document Type and Number:
Japanese Patent JP2015206066
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To extend further the rolling fatigue life of a large rolling bearing used under conditions vulnerable to structure change type peeling, like bearings for windmills and bearings for construction machines.SOLUTION: In a rolling bearing, at least one of an inner ring and an outer ring is composed of an alloy steel of a specified composition and subjected to a carburization treatment or a carbonitriding treatment, and the rolling bearing has a hardness of Hv63 to Hv800 and a compressed residual stress of 50-300 MPa at the depth of 0.01D (D is the diameter of the rolling element) from the surface of the contact surface with the rolling element and meets equations (1) and (2). (1) [Cr]=[Cr]-3.5([C]-0.02[γR]); and (2) 0.5[Si]+0.2[Mn]+0.2[Cr]+0.7[Mo]≥0.95, where [ ] represents a content of each element, and [γR] is the retained austenite amount.
Inventors:
YAMADA KOKI
UYAMA HIDEYUKI
YAO HAO
UYAMA HIDEYUKI
YAO HAO
Application Number:
JP2014086451A
Publication Date:
November 19, 2015
Filing Date:
April 18, 2014
Export Citation:
Assignee:
NSK LTD
International Classes:
C21D1/06; C21D9/40; C22C38/00; C22C38/22; C22C38/44; F16C19/06; F16C33/62
Attorney, Agent or Firm:
Patent business corporation glory patent office
Yuriko Hamada
Kenji Kitajima
Hironori Honda
Yuriko Hamada
Kenji Kitajima
Hironori Honda