| 摘要 |
PROBLEM TO BE SOLVED: To provide a reduction gear capable of achieving a small reduction gear ratio in the reduction gear of a magical planetary gear mechanism. SOLUTION: In this planetary gear mechanism having a fixed internal gear 81 and a movable internal gear 15 of which the difference in numbers of teeth is 1, a plurality of planetary gears are divided into a first planetary gear 12 engaged with the fixed internal gear 81 and a second planetary gear 18 engaged with the movable internal gear 15 in a state that they are engaged with the movable internal gear 15 and the fixed internal gear 81 with specific phase differences to achieve a small reduction gear ratio. COPYRIGHT: (C)2005,JPO&NCIPI
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