Patent ID: 6770152
Filing Date: 2004-08-03
Classification: C21D,C22C,C23C,F16C,Y10S

Abstract:
A rolling bearing having an outer ring and an inner ring, the outer ring and the inner ring each having a raceway surface, or a shaft in a case where the inner ring raceway surface is formed to a shaft as bearing rings in whichat least one of the inner ring (or the shaft) and the outer ring is formed of a steel material containing, as alloy ingredients, between 0.8% by weight and 1.2% by weight of C, between 0.5% by weight and 2.5% by weight of Si, between 0.7% by weight and 1.5% by weight of Cr, between 0.8% by weight and 2.0% by weight of Mo and between 0.3% by weight and 1.2% by weight of Mn into a predetermined shape, hardened and tempered, with a ratio of Mo to Cr (Mo/Cr; weight ratio) at a position from the raceway surface to a core portion by an amount corresponding to 2% of a diameter of a rolling element (position for 2% Da depth) being 1.1 or more, wherein a Vickers hardness (HV) at the position is 720 or more and the amount of the residual austenite at the position is 1.0% by volume or less.