| 摘要 |
<p>A wheel arrangement comprises an essentially vertical driving shaft (120), an essentially circular wheel (111) fixedly provided on a wheel shaft (110), which is rotatable about the vertical driving shaft. A gear (114, 124) interconnects the wheel shaft and the driving shaft. The essentially vertical driving shaft and the wheel shaft form an angle of between 0 and 90 degrees. The wheel has a contact point with the underlying surface forming a virtual circle as the wheel shaft rotates about the driving shaft with a radius from the vertical driving shaft. The gear has a gear ratio based on a modified radius for the virtual circle taking into account factors affecting the shape of the wheel. This provides for a wheel arrangement wherein the turning of the wheel can be performed with a minimum of force and with an improved control.</p> |
