ROLLING BEARING

摘要

A rolling device including an outer member having a raceway surface on its inner peripheral surface, an inner member having a raceway surface on its outer peripheral surface, and rolling bodies rollably arranged between the raceway surface of the outer member and the raceway surface of the inner member. The surface of at least one of the inner member, the outer member, and the rolling bodies is subjected to carbonitriding or nitriding, the area ratio of a nitride containing Si and Mn is not less than 1% and not more than 20%, and the hardness at the surface is not less than 750 HV. Further, if the depth from the raceway surfaces or the depth from the rolling surface of a rolling body is Z and the diameter of the rolling body is d, the hardness at Z = 0.045d is 650 - 850 HV and the hardness at Z = 0.18d is 400 - 800 HV. Flaking on the rolling bodies and on the raceways is suppressed to extend bearing life.