Patent ID: 6440233
Filing Date: 2002-08-27
Classification: C21D,C23C,F16C,Y10S

Abstract:
A rolling bearing including an outer ring having an outer raceway surface, at least one of an inner ring having an inner raceway surface and a shaft integrally formed with an inner raceway surface, and a plurality of rolling elements rotatably disposed between said outer raceway surface and said inner raceway surface,wherein, of the inner ring and the outer ring, at least said inner ring is fabricated with a bearing steel containing a carbon content of 0.6 wt % or more, at least said inner raceway surface has a carbonitrided layer, and in at least said inner ring, a multiple Gd of an impression resistance expressed with the following formula (1) is 1.6 or more, Gd=(H0.2/500)+2Â·Npâ€ƒâ€ƒ(1), wherein NP is a nitrogen content (wt %) at a position of 2% Da depth which is located from the raceway surface to the side of a core portion by the amount of a dimension corresponding to 2% of the diameter of the rolling element and H0.2 is a Vickers hardness (Hv) at the position of 2% Da depth.