| 摘要 |
PURPOSE:To extend a fatigue life of a bearing by providing a surface hardening treated layer, in which depth of a peak in distribution of compression residual stress is set to the almost equal depth when a rolling unit is brought into contact, in a contact part with the rolling unit. CONSTITUTION:A cemented hardened layer 14 and a shot peening hardened layer 15 are compound-formed on a surface layer part of a bearing part 12, and a contact surface 13 with a rolling unit 11 is formed in a lapping finished skin. The cemented hardened layer 14 is set to a depth of about 1mm, and the shot peening hardened layer 15 is set to a depth of about 0.3mm. An internal quality of the shot peening layer is adjusted so as to provide distribution of compression residual stress in a similar figure to distribution S of shearing force generated when the rolling unit 11 is brought into contact with the contact surface 13. Thus, a life is extended by increasing fatigue strength in a region where fatigue destruction is easily generated. |
