| 摘要 |
The present invention provides a power transmission device. The power transmission device according to the present invention comprises: an input shaft having a male screw portion formed thereon; a pair of input gears formed on the input shaft with the male screw portion interposed therebetween and configured to rotate freely; an output gear formed to be able to rotate while being interlocked with the pair of input gears; and a power transmission/interruption unit, which is screw-coupled to the male screw portion of the input shaft, and which reciprocates straightly along the input shaft by means of a rotation of the input shaft and selectively engages with one of the pair of input gears, thereby transmitting power. |
