Coupling assembly of photosensitive drum, photosensitive drum assembly, and cartridge of electrophotographic image forming apparatus

The utility model discloses a coupling assembly of a photosensitive drum, a photosensitive drum assembly and a box of electrophotographic imaging equipment. The connecting assembly of the embodiment comprises a connecting piece, a pushing piece and an elastic element. The pushing piece is movably connected with the connecting piece and is not used for receiving the rotating driving force; wherein the pushing piece can move relative to the connecting piece in the axial direction of the connecting piece, and the elastic element is used for enabling the pushing piece to extend out of the outer end of the connecting piece. The photosensitive drum assembly comprises a photosensitive drum and a connecting assembly arranged at one end of the photosensitive drum, and when the box provided with the photosensitive drum assembly is installed in the electrophotographic imaging equipment, the pushing piece can abut against a driving head in an inclined state in the electrophotographic imaging equipment, so that the inclin