| 摘要 |
A hollow wheel set, comprising mainly a wheel rack, a hollow rotation wheel, a restricting sleeve, and a restricting and fastening ring. The wheel rack includes a fixing arm, on said fixing arm is provided with a wheel fork. The hollow rotation wheel is sleeved onto the wheel fork. One end of the restricting sleeve is a sleeve connection portion, while the other end is a ring-shape blocking portion. The sleeve connection portion is sleeved and fixed on the outer perimeter of the wheel fork, and is located between the wheel fork and the hollow rotation wheel. The ring-shape blocking portion is on a side of the hollow rotation wheel. The restricting and fastening ring is fastened around outer perimeter of the wheel fork, and is locate on the other side of the hollow rotation wheel, to reduce size and weight of the hollow wheel set.
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