| 摘要 |
PURPOSE: A driving-force transmitting part, electrophotographic photosensitive drum, process cartridge and an electrophotographic image forming apparatus, are provided to efficiently affect the transmission of driving force, reduce the length thereof, and to improve the correctness of rotation thereof. CONSTITUTION: A process cartridge detachably mountable to a main body of an electrophotographic image forming apparatus for forming an image on a recording medium, the image forming apparatus having a twisted hole(101), of which the cross-section has a plurality of corners, includes an electrophotographic photosensitive drum. A developing roller develops an electrostatic latent image formed on the electrophotographic photosensitive drum. A driving-force transmitting part(210) is provided on lengthwise one end of the electrophotographic photosensitive drum and has a twisted protrusion(211) to be fitted in the hole and of which the cross-section has a plurality of corners, a shaft portion(212) supported by a bearing portion, and a gear portion(213) for transmitting a driving force to the developing roller. And the shaft portion and the gear portion overlap each other in the axial direction of the electrophotographic photosensitive drum, and when the hole is rotated with the protrusion fitted in the hole when the process cartridge is mounted to the main body of the apparatus, the rotational force of the hole is transmitted to the electrophotographic photosensitive drum through the protrusion.
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