| 摘要 |
PROBLEM TO BE SOLVED: To facilitate assembling work in a small and light structure, to prevent occurrence of tooth hummer sound harsh on the ear for a long time, and to suppress occurrence of axial backlash without severely regulating shape size accuracy. SOLUTION: Width of a male spline tooth disposed on the outer peripheral surface of a spline shaft 17 is increased with going inward in the axial direction. Width of a female spline tooth disposed on the inner peripheral surface of a spline hole 14 is decreased with going inward in the axial direction. As the spline shaft 17 is inserted into the spline hole 14, the male and female spline parts 38a and 39a are engaged with each other in the edge shape. A bolt 59 screwed with the tip of the spline shaft 17 through a cap 45 pulls the spline shaft 17 outwardly.
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