Electric drive for a bicycle

摘要

The drive has a rotor (4) arranged radially outside a stator (3), and an eccentric cam gear box comprising cams (9, 10) with curve portions and an outer ring (13) with teeth. The cams are eccentric supported in the outer ring and moved on the teeth of the outer ring. The cams lie radially outside of the rotor, and are driven by the rotor. A propelling part of the rotor is eccentrically executed around a periphery of the cams to a rotor axis (6). An eccentric ring is aligned and provided to the rotor axis at an outer perimeter of the rotor.