| 摘要 |
PROBLEM TO BE SOLVED: To improve transmission efficiency, make it compact and raise mounting degree of freedom, reduce the number of part items, and easily assemble it by directly connecting a rotary rotor of the motor to a carrier of a planetary reduction gear and accommodating a reduction gear mechanism unit and a motor driving unit in a single housing. SOLUTION: A carrier 24 for eccentrically rotating a planetary gear or a planetary roller 22 of the planetary reduction gear and an electrically rotated rotary rotor 31 are connected together in a torque transmissible manner and the rotary rotor 31 is ring held on a bearing rod 30 integrally formed with an output shaft 20 of the planetary reduction gear in a rotatable manner. The planetary reduction gear mechanism is preferable to be a hypocycloid reduction gear or a cycloid reduction gear.
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