| 摘要 |
The object of the invention is to prevent, in a rolling bearing such as a rolling bearing for an alternator of an automobile, the life period from being shortened due to the temporal reduction of a radial internal clearance even in a high temperature environment, particularly without increasing the cost as compared with a conventional rolling bearing of such a type. In order to attain the object, according to the invention, in a rolling bearing in which a plurality of rolling elements are rotatably disposed between an inner race and an outer race, and at least the inner race and the outer race are made of a steel material, an austenite residual rate of the inner race is smaller than an austenite residual rate of the outer race. The amount of dimensional expansion of the outer race due to the martensite transformation of residual austenite is larger than that of the inner race, so that the occurrence of clearance loss is suppressed even when dimensional expansion of the balls occurs.
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