Patent ID: 8556055

Claim:
A driving apparatus for a rear hub of a bicycle comprising: a hub shell that has a receiving space formed at one side of the hub shell, and the receiving space having a shaft passing therethrough, wherein the shaft has a thread section provided for a locking unit, and a plurality of wedging slots located around an inner perimeter of the receiving space, and a fixed ring is configured to tightly engage with the wedging slots and has a plurality of wedging ribs located at an inner perimeter thereof, wherein a stopping edge and a wedging groove are formed inside and outside the wedging slots respectively, and the stopping edge is formed for a bearing that is passed through by the shaft, wherein a stopping unit is formed on the side of the bearing and used to secure the bearing and the wedging groove is provided for a restricting unit; said wedging ribs of said fixed ring adapted to allow switching from a single-directional driving component to a dual-directional driving component, said single-directional driving component and said dual-directional driving component alternately placed in said hub engaged with said wedging ribs of the fixed ring, the single-directional driving component having a ratchet ring and a ratchet base, wherein the ratchet ring has a plurality of single-directional inclined surfaces formed around an inner perimeter of the ratchet ring, while a plurality of engaging ribs are formed around an outside perimeter of the ratchet ring, and the engaging ribs are adapted to engage with the wedging ribs of the fixed ring of the hub shell, wherein the ratchet base has a through hole through the axial direction adapted to receive the shaft, and the ratchet base has a plurality of conjugating portions located around an outer perimeter at one end thereof, and a first conjugating slot is axially and recessedly formed on one of the conjugating portions, while a second conjugating slot that is facing the first conjugating slot is axially and recessedly formed on another conjugating portion, wherein the first conjugating slot receives a resilient unit and the second conjugating slot receives a hook, and the resilient unit contacts the inner portion of the hook and biases the hook against one of the plurality of inclined surfaces of the ratchet ring, wherein one end of the hook has a rotating portion, and the other end of the ratchet base has a tooth plate; and the dual-directional driving component has a penetrating hole adapted to receive the shaft, and one end of the dual-directional driving component having a plurality of conjugating ribs adapted to be engaged with the wedging ribs of the fixed ring of the hub shell, so that when the conjugating ribs of the dual-directional component are engaged with the wedging ribs and a second tooth plate on the other end of the dual-directional driving component rotates, the dual-directional driving component rotates a tire of the bicycle.