| 摘要 |
A wheel unit includes a motor, a pinion gear fixed to a rotating portion of the motor, a wheel including an annular ground surface and rotating about a final gear support shaft, a final gear fixed to the wheel directly or via another member, a speed reduction mechanism which decelerates rotation of the pinion gear and transmits the rotation to the final gear, and a gear case which accommodates the pinion gear, the speed reduction mechanism, and the final gear. A rotation support portion rotating along with the final gear and the wheel while being supported by the gear case is provided between the final gear and the wheel. An outside diameter of the rotation support portion is greater than an outside diameter of the final gear support shaft. |
