| 主权项 |
1. A hub assembly comprising:
a hub having an axle extending axially therethrough, a space defined in a first end thereof, a connection ring located in the space and having multiple first teeth extending axially from an inner periphery thereof; a hollow socket having an open end in a first end thereof and a second end of the socket adapted to be connected with a flywheel, the open end having multiple second teeth extending axially from an inner periphery thereof, the open end inserted into the space and the axle extending through the socket, and a driving unit being an integral unit and having a sleeve, a first ratchet ring, a second ratchet ring, two roller members and two resilient members, the first ratchet ring having third teeth extending axially from outside thereof, the second ratchet ring having fourth teeth extending axially from outside thereof, multiple first ratchet teeth extending from one end face of the first ratchet ring, multiple second ratchet teeth extending from one end face of the second ratchet ring, the first and second ratchet rings mounted to the sleeve, the first and second ratchet teeth being engaged with each other, the two roller members respectively located in the first and second ratchet rings, the two resilient members are two ring-shaped members and mounted to two ends of the sleeve respectively and located outside of the first and second ratchet rings respectively, the driving unit located in the space and the axle extending through the driving unit, the third teeth of the first ratchet ring engaged with the first teeth of the connection ring, the fourth teeth of the first ratchet ring engaged with the second teeth of the socket, the driving unit being connected between the connection ring and the socket. |
