| 摘要 |
PURPOSE: A power transmission device is provided to change the transmission direction of power from an external driving source according to whether power is applied to the power transmission device. CONSTITUTION: A power transmission device comprises a field coil assembly(60) and a power transmission direction changing device. The field coil assembly generates an electromagnetic force according to power application. The power transmission direction changing device selectively changes the transmission direction of power from a driving source according to power application to the field coil assembly. |
