| 摘要 |
<p>This inner member (3, 33) of a constant velocity universal joint (1, 31) at the outer periphery of which a raceway surface (15, 37) is formed that supports torque transmission elements (4, 5, 22, 34) and at the inner periphery of which a spline section (13, 46) is formed is characterized by the inner member (3, 33) comprising a steel material and being subjected to carburizing, quenching, and tempering of which the carburizing is locally suppressed, the spline section (13, 46) being a slack quenched section, at least the surface of the spline major diameter having a metal structure not having a carburized abnormal layer, and a quenched section having a higher carbon concentration than the spline section being formed at the surface other than the spline section (13, 46).</p> |
