| 摘要 |
PROBLEM TO BE SOLVED: To reduce occurrence of disadvantage caused by inclination of a speed change gear to a shaft.SOLUTION: A hub part 12A of a speed change gear 12 is constituted to be press fitted on a connecting part 11a of a shaft 11 through a connection structure such as a spline or the like in such a way that a torque can be transmitted. The shaft 11 is provided with a guide protrusion 11b for movably supporting a hub part 12A of a speed change gear 12 in an axial direction while assuring concentricity of the speed change gear 12 in respect to the shaft 11 when the hub part 12A of the speed change gear 12 is press fitted on the connecting part 11a of the shaft 11. The guide protrusion 11b is arranged to be spaced apart from the connecting part 11a by a prescribed amount in an axial direction. An axial length L4 from an end part of the connecting part 11a near the guide protrusion 11b to an end part of the guide protrusion 11b far from the connecting part 11a is set long as compared with an axial length L3 of the connecting part [an inner spline 12a] arranged at the inner periphery of the hub part 12A of the speed change gear 12.SELECTED DRAWING: Figure 2 |
