| 摘要 |
A power transmission device includes a motor, a first gear member having an internal gear and an external gear, wherein an output of the motor is transmitted to the internal gear to rotate the first gear member, a planet gear member having a first gear part having a smaller diameter and a second gear part having a larger diameter, wherein the second gear part engages with the external gear of the first gear member, and the planet gear member revolves around an axis of rotation of the first gear member, and a driven member having an internal gear part, wherein the driven member is driven by the first gear part of the planet gear member engaging with the internal gear part of the driven member with the planet gear member having revolved.
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