| 摘要 |
A power transmission shaft which can be evaluated on torsional fatigue strength based on a management indicator different from compressive residual stress in an outer surface. In a power transmission shaft having outer circumferential serrations 1 a, 1 b, torsional fatigue strength is evaluated by using compressive residual stress at a depth of 30 mum (and 50 mum) from an outer surface of a rising portion of each concave of the outer circumferential serrations 1 a, 1 b as a management indicator. A high torsional fatigue strength can be secured by having a compressive residual stress of 1150 MPa or more at a depth of 30 mum (and 50 mum) from the outer surface.
|
