Pedal force sensing apparatus for an electric bicycle

A pedal force sensing apparatus for an electric bicycle, comprising:

• a pedal force input shaft whose center line is designated as an axial direction;
• a torque output shaft mounted around the pedal force input shaft and including at least one leading groove;
• a force action sleeve mounted around and fixed on the pedal force input shaft and including at least one first guiding pin;
• at least one elastomer whose two ends separately contact the force action sleeve and torque output shaft for transferring torque from the force action sleeve to the torque output shaft, wherein an elastic deformation is formed by a relative angular displacement between the torque output shaft and the force action sleeve;
• a diversion sleeve including at least one spiral slot and at least one second guiding pin, wherein a relative axial direction displacement and a relative angular displacement exist between the spiral slot and first guiding pin, and a relative axial direction displacement exists between the leading groove and the second guiding pin;
• a linear sliding bush mounted on the pedal force input shaft and sliding along the axial direction in synchronous relation with the diversion sleeve;
• and
• a displacement sensor for sensing the axial direction displacement of the linear sliding bush.