| 摘要 |
<p>A spline hub 1 is a component of a clutch disk assembly 30, which transmits torque between a flywheel 31 and an input shaft 32 of a transmission. The spline hub 1 is produced without being plated, while maintaining the resistance to wear and the accuracy of the dimension of the spline hub 1. The spline hub 1 includes a flange portion 3 and a boss portion 2. The flange portion 3 is coupled to a plate 7 of the clutch disk assembly 30, through which torque is transmitted from the flywheel 31. The boss portion 2 is fixedly coupled to the inner peripheral end of the flange portion 3. Spline grooves 20 are formed on the inner peripheral surface of the boss portion 2. The boss portion 2 is spline-engaged with an input shaft 32 of the transmission. Hardened layers 20a are partially formed on the surface of the spline grooves 20. In one embodiment, the bore of the spline hub 1 has ring-shaped hardened layers 20a intersecting the spline grooves 20. The ring-shaped hardened layers 20a are axially separated from each other. In another embodiment only selected spots of the spline grooves 20 have hardened layers 20b.</p> |
