POWER TRANSMISSION DEVICE

The power transmission device includes: a drive motor assembly including a motor housing, a first axial flow motor disposed in a front portion of the motor housing and rotating a first pinion gear in a first rotation direction, and a second axial flow motor disposed in a rear portion of the motor housing and operably coupled to a second pinion gear to rotate the second pinion gear in a second rotation direction opposite to the first rotation direction; a drum surrounding the drive motor assembly by including a drum disk portion disposed on one surface in a wheel axial direction and a cylindrical portion extending from an outer diameter end of the drum disk portion in the wheel axial direction; a drum cover coupled to the other surface of the drum in the wheel axial direction, and having a ring gear disposed on its outer diameter and meshed with the first and second pinion gears; and a wheel hub installed with a tire, and coupled to the drum to be rotated together with the drum, wherein the first and second pinion gears are rotated at the same speed.