| 摘要 |
PROBLEM TO BE SOLVED: To provide a reduction gear device of low noise capable of reducing energy loss though it is compact and has a simple structure. SOLUTION: Since this reduction gear device is provided with only gears of two stages, that is, a large-diameter gear 65 and a small-diameter gear 66 of a third external gear 63 supported on a supporting shaft 59, and a second external gear 58 of one stage engaged with the small-diameter gear 66 and disposed on one axial end of a crankshaft 40, the total axial length of the reduction gear device can be reduced, and the device can be miniaturized. Further since the gears are engaged only at two places in transmitting driving force from a first external gear 54 to the crankshaft 40, noise can be reduced, and energy loss can be lowered. COPYRIGHT: (C)2008,JPO&INPIT
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