| 摘要 |
PROBLEM TO BE SOLVED: To sufficiently secure durability of a spline engaging part of a male spline part 16 and a female spline part 20a while excellently maintaining assembling workability of a hub 4 and a driving shaft 18. SOLUTION: Plural male spline grooves 19a and 19a for constituting the male spline part 20a and plural female spline grooves 15 for constituting the female spline part 16 are formed in parallel to a central shaft of the spline engaging part. By adopting such constitution, when transmitting torque in this spline engaging part, the respective male spline grooves 19a and 19a and the respective female spline grooves 15 are contacted over the shaft directional total length to solve the purpose. |
