| 摘要 |
<P>PROBLEM TO BE SOLVED: To secure strength of an outer diameter surface of an inner ring and track grooves and secure strength of a spline and accuracy of fitting at the same time by forming an optimum thermal treatment hardened layer with the outer diameter surface of the inner ring, the track grooves and the spline. <P>SOLUTION: In the inner ring 6 mounted in the constant velocity universal joint for transmitting torque while allowing angular displacement between the inner ring 6 and an outer ring, the plurality of track grooves 5 are formed at equal intervals along an axial direction in an outer diameter surface 4 and the spline 23 for shaft fitting is formed in an inner diameter surface of a shaft hole 22, thermal treatment hardened layers 21, 28 by induction hardening are formed at the outer diameter surface 4, the track grooves 5 and the spline 23 and the hardened layer 21 of the outer diameter surface 4 and the track grooves 5 is deeper than the hardened layer 28 of the spline 23. <P>COPYRIGHT: (C)2007,JPO&INPIT |
