Patent ID: 7603929
Filing Date: 2009-10-20
Classification: C21D,C23C,F01L,F16C,F16H,Y10T

Abstract:
1. A rolling bearing, comprising: an outer member; an inner member located inside said outer member; and a rolling element interposed between said outer member and said inner member; wherein at least one member of said outer member and said inner member has a nitrogen enriched layer, in said at least one member, austenite grain size of a surface portion of an area in a rolling contact surface where said rolling element rolls is at least No. 11, said surface portion of the area in said rolling contact surface includes 15 to 35 volume % of retained austenite, a microstructure of an area other than the surface portion of the area in said rolling contact surface contains ferrite and carbide; and an end portion of that member has hardness of at most HV (Vickers hardness) 300.