| 摘要 |
<p>A hub assembly includes a hub with an axle extending axially therethrough. A socket has an open end in a first end thereof which is inserted into the space of the hub. A driving unit includes a sleeve, two ratchet rings, two roller members and two resilient members. The first and second ratchet rings are engaged with each other by teeth on the two respective end faces thereof. The first and second ratchet rings are mounted to the sleeve. The two roller members are respectively located in the two ratchet rings. The two resilient members are mounted to two ends of the sleeve respectively and located outside of the first and second ratchet rings. The driving unit is located in the space and the axle extends through the driving unit which is an integral single part. The driving device operates smoothly and has less noise.</p> |
