| 摘要 |
PROBLEM TO BE SOLVED: To largely increase the final reduction gear ratio and the final output torque, by increasing the reduction gear ratio by a driving external gear 65 and a driven external gear 66. SOLUTION: Since a different pair of gear groups 67 are arranged by being dislocated in the axial direction of an input shaft 62 by setting a position in the axial direction in the same to the input shaft 62 of the two driven external gears 66 respectively constituting a plurality of pairs of gear groups 67, only the two driven external gears 66 constituting the pair of gear groups 67 exist in the same position in the axial direction of the input shaft 62. As a result, even if these driven external gears 66 are diametrically expanded up to a full limit, mutual interference is not caused, and the reduction gear ratio by the driving-driven external gears 65 and 66 can be easily increased. COPYRIGHT: (C)2009,JPO&INPIT
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