Power module of electric assisted bicycle

A power module of an electric assisted bicycle, comprising:

• a housing with which a radial direction and an axial direction are defined, and comprising an end cap, a middle frame and a partition portion, wherein the end cap and the middle frame are connected to each other to define an inner space, and the partition portion is extended along the radial direction toward the inner space, and divides the inner space of the housing into a motor accommodation portion and a reducer accommodation portion arranged along the axial direction, wherein the motor accommodation portion is arranged between the end cap and the partition portion;
• a pedal shaft accommodated in the housing, extended along the axial direction, and passing through the end cap;
• a motor accommodated in the motor accommodation portion, and fixed to the partition portion along the axial direction;
• a reducer accommodated in the reducer accommodation portion, fixed to the partition portion along the axial direction, and comprising a reducer input shaft, wherein the reducer input shaft comprises an input-shaft main part, an input-shaft rotor part and an extension portion, the input-shaft rotor part is arranged between the input-shaft main part and the extension portion and connected to a motor output shaft of the motor along the radial direction, the input-shaft main part is connected to the partition portion along the radial direction, and the extension portion is extended toward the end cap along the axial direction and connected to a supporting portion of the end cap through an input-shaft rear bearing, wherein the supporting portion, the input-shaft rear bearing and the extension portion are sleeved from inside of the inner space to outside along the radial direction sequentially toward the middle frame;
• a pedal-shaft first two-way bearing sleeved between the pedal shaft and the supporting portion;
• and
• an encoder component disposed between the extension portion and the end cap along the axial direction.