Bicycle driving device and ratchet mechanism thereof

The utility model belongs to the field of bicycle driving, and particularly relates to a bicycle driving device and a ratchet mechanism thereof. Comprising cranks, a main chain wheel and ratchet mechanisms, the tail ends of the cranks are connected with pedals, the cranks comprise a left crank and a right crank, and the front ends of the left crank and the right crank are linked with the main chain wheel through the ratchet mechanisms; the pulley is arranged on the frame and is positioned above the tail ends of the left crank and the right crank; the first end of the flexible cable is connected with the tail end of the left crank, and the second end of the flexible cable bypasses the pulley and is connected with the tail end of the right crank. The flexible cable pulley type crank reciprocating swing driving mechanism driving bicycle is simple in structure and low in cost, and the driving efficiency of the bicycle is improved. 本实用新型属于自行车驱动领域，具体涉及一种自行车驱动装置及其棘轮机构。包括曲柄、主链轮以及棘轮机构，曲柄末端连接踏板，曲柄包括左曲柄与右曲柄，左曲柄与右曲柄的前端均通