| 摘要 |
PROBLEM TO BE SOLVED: To dispense with the enhancement of strength of the bearings of an output shaft and an input shaft and facilitate the design by providing a coupling having a first fitting part and second fitting part to be fitted to the rear end of the output shaft and the front end of the input shaft in such a manner as to be axially slidable and relatively non-rotatable. SOLUTION: An output shaft 35 and an input shaft 52 are arranged on substantially the same axial center. In this connecting structure, the rear outside of the output shaft 35 is formed into a gear shape, and the front inside of a coupling 51 is formed into an internal gear shape to constitute a first fitting part where the both are fitted in such a manner as to be axially slidable and relatively non-rotatable. On the other hand, the front outside of the input shaft 52 is splined, so that a spacer 53 is fitted thereto. The circumference of the spacer 53 is formed into a gear shape, and the rear inside of the coupling 51 is also formed into an internal gear shape to constitute a second fitting part where the both are fitted in such a manner as to be axially slidable and relatively non-rotatable. The fitting precision of the second fitting part is set high, while the fitting precision of the first fitting part is set low.
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