| 摘要 |
PROBLEM TO BE SOLVED: To prevent the occurrence of cracks with an impression as a starting point, even when an axial dislocation quantity is large, and contact bearing pressure of a rolling surface of a roller and raceway surfaces of inner and outer races is high in a roller bearing. SOLUTION: A bus bar 31, forming the rolling surface of the roller 3, is formed of a single circular arc (a projection surface). A bus bar, forming the raceway surfaces 10 and 20 of the inner and outer races 1 and 2, is formed of first bus bars 11 and 21 of a shaft directional central part, and second bus bars 12 and 22 of shaft directional both end parts. The second bus bars 12 and 22 have a radius of curvature, such as separating from the bus bar 31 forming the rolling surface of the roller 3. After forming the inner race 1, the outer race 2, and the roller 3 of an iron and steel material having the prescribed composition, carburization or carbonitriding processing and quenching-tempering are carried out, so that the remaining austenite quantity of the surface layer part of the raceway surfaces and the rolling surface is set to 20.0 to 40.0 volume %.
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