| CPC B60G 9/02 (2013.01) | 20 Claims |

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1. An axle structure, comprising:
a pedestal;
a pivot shaft, disposed on the pedestal; and
an axle, wherein a middle of the axle is rotatably connected to the pivot shaft, allowing two ends of the axle to rotate vertically relative to the pedestal;
wherein the pivot shaft comprises an intermediate section and connecting sections connected to two ends of the intermediate section, a diameter of the intermediate section is greater than a diameter of the connecting section, and the middle of the axle is rotatably connected to the intermediate section.
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