| 摘要 |
A wheel unit for overcoming obstacles comprises a wheel part and a gear part. The wheel part comprises a wheel portion and a tire portion. The gear part comprises a shaft portion coupled to the wheel portion of the wheel part and a gear portion coupled to an external surface of the shaft portion to overcome obstacles. The gear portion comprises a coupling unit coupled to an external surface of the shaft portion and a plurality of protruding units protruding to an external surface of the coupling unit at a constant distance. |
