Electrophotographic image forming apparatus, cartridge and drum unit

A cartridge comprising:

• a casing;
• a photosensitive drum supported by the casing;
• and
• a coupling positioned adjacent to an end of the photosensitive drum, the coupling being operatively connected to the photosensitive drum so as to be capable of transmitting a driving force to the photosensitive drum, the coupling being rotatable in a rotational direction about a rotational axis of the coupling, the coupling including:
• a shaft portion having an opening formed therein, the shaft portion extending in a direction of the rotational axis of the coupling,
• an engaging portion including (i) an upstream portion configured to receive the driving force in the rotational direction, (ii) a downstream portion positioned downstream of the upstream portion in the rotational direction, the downstream portion being configured to receive a force that opposes the driving force in a direction opposite to the rotational direction, and (iii) an upper portion facing away from the photosensitive drum in the direction of the rotational axis, the upper portion being at least positioned between the upstream portion and the downstream portion in the rotational direction, and
• a visor portion projecting from the shaft portion in a direction away from the rotational axis of the coupling,
• wherein the rotational axis of the coupling extends through the opening,
• wherein a distance in the direction of the rotational axis from the end of the photosensitive drum to the upper portion decreases along the upper portion in the rotational direction, and
• wherein, as viewed in the direction of the rotational axis from a position where the coupling is in front of the photosensitive drum, at least a part of the engaging portion is positioned outward of the opening.