| 摘要 |
A rolling bearing comprises an inner race which can be used under a high fitting stress of over 130 MPa, and can be manufactured more quickly than the conventional one. The inner race is formed from an alloy steel whose carbon content ranges from 0.3 to 0.7% by weight; the inner race is subjected to a carburizing or carbonitriding treatment; the carbon content (C1) of the surface layer of the raceway track is at most 1.3% by weight; and there is a difference ( DELTA C = C1 - C2) between the carbon content (C1) of the surface layer and the carbon content (C2) of the core of at least 0.4% by weight. When the amount of residual austenite of the inner race is 4.0 vol % or less and the hardness of the raceway track is HV 720 or more, the inner race is high in dimensional stability, and its life time with a foreign matter mixed high temperature lubricant is increased.
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