Electrophotographic photosensitive drum, process cartridge, and electrophotographic image forming apparatus

An electrophotographic photosensitive drum usable with an electrophotographic image forming apparatus, comprising:

• a non-circular twisted projection having a cross-section with a plurality of corner portions, said non-circular twisted projection being provided at one longitudinal end of said electrophotographic photosensitive drum, and being engageable with a non-circular twisted hole having a cross-section with a plurality of corner portions, the non-circular twisted hole being disposed at a central portion of a driving rotatable member of a main assembly of the image forming apparatus;
• and
• a drum electroconductive member provided on said projection and being electrically connected with said electrophotographic photosensitive drum, said drum electroconductive member being contactable with a main-assembly electroconductive member electrically connected with the main assembly of the image forming apparatus, the main-assembly electroconductive member being disposed in the hole to ground said electrophotographic photosensitive drum,
• wherein a contact position between said drum electroconductive member and the main-assembly electroconductive member moves in interrelation with said projection being moved toward the hole by rotation of the driving rotatable member when said projection is engaged with the hole of the driving rotatable member, and
• wherein said drum electroconductive member has a projected hook, and a driving side flange member of said non-circular twisted projection has a recess configured to engage said hook, to prevent movement of said drum electroconductive member, and when said drum electroconductive member is mounted to said driving side flange member, said hook and said recess are urged toward engagement with each other.