Patent ID: 8088230
Filing Date: 2012-01-03
Classification: C21D,C22C,C23C,F16C,Y02P,Y10S

Abstract:
1. A rolling apparatus comprising: an external member having a raceway surface on an inner peripheral surface thereof; an internal member having a raceway surface on an outer peripheral surface thereof; and a plurality of rolling elements which are rotatably provided between the raceway surface of the external member and the raceway surface of the internal member, wherein a surface of at least one of the internal member, the external member, and the rolling elements is subjected to carbonitriding or nitriding, an area percentage of a nitride containing Si and Mn is 1% or more and 20% or less, a hardness on a surface is HV750 or more, and when depth from the raceway surface or depth from a rolling surface of the rolling element is defined as Z and diameter of the rolling element is defined as d, hardness at Z=0.045d is HV650 to 850, and hardness at Z=0.18d is HV400 to 800.