| 摘要 |
A chainless type multistage transmission device comprises a transmission device (10) provided on a ratchet shaft (200) of a bicycle rear wheel (100) and a driving device (20) with one end connected to the transmission device (10). The transmission device (10) comprises a driven member (1) provided on the ratchet shaft (200), the driven member (1) having a first long hole (11) at the edge thereof, a driving member (2) positioned on one side of the driven member (1) and being capable of driving the driven member (1) to rotate, and a control device (3) meshed with the driving member (2) and being capable of controlling the rotational inertia of the driving member (2) to increase or decrease. Accordingly, the chainless type multistage transmission device can be suitable for various bicycle assembly applications without problems of chain jamming, chain falling off and the like, thereby achieving multistage transmission function and solving the problems of structure and weight caused by the ratchet. |
