Patent ID: 9340104
Filing Date: 2016-05-17
CPC Classification: B60K,B60Y,F16H

Claim Text:
1. A wheel unit, comprising: a motor; a pinion gear which is fixed to a rotating portion of the motor; a wheel which includes an annular ground surface and rotates about a final gear support shaft; a final gear made of a resin, which is fixed to the wheel directly or via another member and is disposed on one side in an axial direction with respect to the wheel; 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; wherein a rotation support portion which rotates along with the final gear and the wheel while being supported by the gear case directly or via another member 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; and at least a portion of the final gear is positioned on an inside of a cylindrical or substantially cylindrical area surrounded by the ground surface.