Electrical drive for a bicycle

摘要

An electrical drive includes a driven ratchet base (17) mounted on a crank axle (50) and engaged with a chain wheel (52). A drive ratchet base (25) is rotatably mounted on the crank axle and includes a first end for rotating the driven ratchet base along one direct ion only, and a second end formed with a first engaging bevel gear (256). A ring element (23) is fixedly mounted on the crank axle, and two pivot axles (232) each extend from the ring element and each have a second engaging bevel gear (26) meshing with the first engaging bevel gear. A retaining bevel gear (27) meshes with the second engaging bevel gears and is retained by an inner wall of a housing (22). <IMAGE>