| 摘要 |
Disclosure is a one-way transmission for a motor having a structure capable of changing a speed while obtaining an output in the direction same as that of the forward rotation when the motor is rotated in a reverse direction. The one-way transmission for a motor according to the present invention includes a hub shell secured onto a fixed shaft extended in both directions such that the hub shell is rotatable, a built-in motor having a driving shaft disposed in the hub shell, and a transmission unit interposed between the driving shaft and the hub shell to output, with a speed change, the driving force of the built-in motor to the hub shell in one direction. The transmission unit includes a first sun gear and a second sun gear coupled with each other with a gap on an outer circumference of the driving shaft and restrained by a one-way clutch such that the first sun gear and the second sun gear have directionalities opposite from each other, a first planetary gear engaged with the first sun gear, and a second planetary gear engaged with the second sun gear and with the first planetary gear and the hub shell.
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