Power-split hybrid driveline for an electric bicycle

An electric auxiliary drive system for a bicycle, comprising:

• a pedal crankshaft for operation by a rider;
• an epicyclic gearing mechanism configured to determine a transmission ratio between the pedal crankshaft and an output shaft for transmitting rotation to a rear wheel of the bicycle,
• an assist motor for driving the output shaft;
• a control motor drivingly connected to the epicyclic gearing mechanism for controlling, through the epicyclic gearing mechanism, the transmission ratio between the pedal crankshaft and the output shaft;
• a first one-way clutch operatively connected between the control motor and a rigid element fixedly mountable to a bicycle frame, wherein the first one-way clutch is configured for blocking a rotation of a first rotatable member of the epicyclic gearing mechanism in a first, forward direction of rotation and for releasing and allowing free rotation of said first rotatable member of the epicyclic gearing mechanism in a second, reverse direction of rotation;
• and
• a second one-way clutch operatively connected between the assist motor and the output shaft, wherein the second one-way clutch is configured for drivingly connecting the assist motor to the output shaft when the assist motor is switched on to drive the output shaft in a forward direction, so as to assist in driving the bicycle forwards, and for disengaging the assist motor from the output shaft when the assist motor is switched off but the output shaft continues rotation in the forward direction, wherein
• the electric auxiliary drive system further comprises:
• a second pinion gear releasably and drivingly connectable to a shaft of the assist motor through said second one-way clutch, and
• a traction gear which is secured for rotation with the output shaft and which meshes with said second pinion gear.