| 摘要 |
A "four directions moving" structure can walk facing front, back, left and right without changing its direction. Its wheels are designed as two groups of wheels which are vertical with each other (it has four rows wheels in quadrate in which wheels turning in the same direction are one group), and two projects carrying out the "four directions moving": 1, the height of one of the two groups of wheels can be changed; 2, the conventional wheels are formed by circular prejudicial or elliptical or noncircular (for example polygonal) wheels so that it won't be obstacle by using the longer diameter thereof to increase the height of the vehicle position so that the vertically direction wheels are moved away from the ground.
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