| 摘要 |
<p>PURPOSE:To provide the compact pressing structure on a road surface of a driving wheel, reduce the number of parts, improve the assembly workability, and permit the stable traveling. CONSTITUTION:A ring-shaped bracket 238 is fitted onto a pin 236 installed on a cam plate 156, and a pulling coil spring 240 is interposed between the bracket 238 and a reinforcing member 158 installed at the top end of a movable base plate 110, and the movable base plate 110 is energized downward. Through this energization, a tire 104 is pressed down on a road surface. Further, since in the manual operation mode, the engagement points at both the end parts approach, the energizing force of the pulling coil spring 240 is reduced, and the torque applied on a motor 154 can be reduced.</p> |
