| 摘要 |
The present invention comprises a motor, a gear device mounted on the motor, and a drive shaft which rotates interlocking with the gear device, wherein the motor comprises: a motor housing; a hollow stator mounted in the motor housing; a rotor rotatably disposed inside the stator; and a hollow motor shaft having a hollow portion through which the drive shaft passes, and having the rotor mounted thereon. At least one of the hollow motor shaft and the drive shaft has an oil transfer unit for guiding, in the direction of the gear device, an oil which is introduced from the gear device into between the inner circumference of the hollow motor shaft and the outer circumference of the drive shaft, thereby being capable of preventing the oil of the gear device from leaking through between the inner circumference of the hollow motor shaft and the outer circumference of the drive shaft, and of minimizing damage to the inside of the motor which may occur when the oil which has passed between the inner circumference of the hollow motor and the outer circumference of the drive shaft leaks into the motor. |
