A double-chain bicycle driving device comprises a guard board. A driving ring is arranged at the right end of the guard board. A speed change flywheel is arranged at the left end of the guard board, and chains are arranged between the driving ring and the speed change flywheel. The number of the chains is two. One chain is a forward chain directly connected with the speed change flywheel. The other chain is a reverse chain connected with the speed change flywheel through a direction change flywheel. The double-chain bicycle driving device has the beneficial effects that a corresponding variable gear is in the no-load state and the risk caused by rotating speed change of a pedal during a speed change process is avoided. The flywheel and the chains are wrapped by the guard board, and trouser legs are prevented from being contaminated and are prevented from being drawn into a bicycle, so that danger is avoided.
Double-chain bicycle driving device
2015-07-08
Patent
Electronic Resource
English
IPC: | B62M RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES , Antrieb von Radfahrzeugen oder Schlitten durch den Fahrer |