| 摘要 |
PROBLEM TO BE SOLVED: To greatly increase a final gear ratio and a final output torque by increasing reduction ratios by a drive external gear 65 and driven external gears 66. SOLUTION: Axial positions relative to an input shaft 62 of two driven external gears 66 constituting each of plural paired gear groups 67 are identical and different paired gear groups 67 are disposed with shifted in the axial direction of the input shaft 62, so that the only two driven external gears 66 constituting the paired gear group 67 exist in the same axial directional position of the input shaft 62, resulting in no interference between these driven external gears 66 even if diameters of the driven external gears 66 are enlarged to their limits to thereby allow the increase in the reduction ratio by the drive and driven external gears 65, 66. |
