| 摘要 |
<p>The present invention relates to a sub wheel unit used as a sub wheel by being installed in a small excavator. More specifically, as a sub wheel for an excavator is included but is combined with a caterpillar of a side, an excavator is able to move a pair of rails in parallel by the sub wheel while a work time is reduced, and damage to the rails and safety accidents prevented. Moreover, as the excavator works while being in parallel, accuracy of work is improved, thereby improving work efficiency.</p> |
