| 摘要 |
A wheel structure is provided to reduce the number of parts and to adjust the size and the width of a wheel variously. A wheel structure includes a wheel body(110), a wheel support member(130), and a bearing part(150). The wheel body is rotatably mounted. The wheel support member receives the wheel body at the upper part of the wheel body. The bearing part is provided between the wheel body and the wheel support member. The bearing part includes a first upper bearing and a second upper bearing. The first upper bearing makes contact with a front portion of the upper portion of the wheel body. The second upper bearing makes contact with the rear portion of the upper portion of the wheel body.
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