Patent ID: 6901229

Claim:
A process cartridge detachably mountable to a main body of an electrophotographic image forming apparatus for forming an image on a recording medium, the main body having a twisted hole whose cross-section has a plurality of corners, said process cartridge comprising: an electrophotographic photosensitive drum having a drum cylinder; a developing roller for developing an electrostatic latent image formed on said electrophotographic photosensitive drum; and a driving-force transmitting part provided on one lengthwise end of said electrophotographic photosensitive drum, said driving-force transmitting part having: a coupling portion fitted and fixed to one end of said drum cylinder of said electrophotographic photosensitive drum, a twisted protrusion to be fitted in the twisted hole, wherein a cross-section of said twisted protrusion has a plurality of corners, a shaft supported by a bearing portion, a gear portion for transmitting a driving force to said developing roller, said shaft and said gear portion overlapping each other in an axial direction of said electrophotographic photosensitive drum, and a second gear portion provided in juxtaposed relationship with said gear portion and disposed between said gear portion and said coupling portion in the axial direction, wherein said second gear portion transmits a driving force to a transfer roller provided in the main body of the apparatus, wherein when the twisted hole is rotated with said protrusion fitted in the twisted hole when said process cartridge is mounted to the main body of the apparatus, a rotational force of the twisted hole is transmitted to said electrophotographic photosensitive drum through said protrusion, and wherein said coupling portion, said second gear portion, said gear portion, said shaft, and said twisted protrusion provided on an end surface of said shaft are formed integrally.