Driving force transmission mechanism and process cartridge containing the same

1. A driving force transmission mechanism, comprising a photosensitive drum driving member, wherein the photosensitive drum driving member engaged with an image forming apparatus driving member to transmit the driving force;

the image forming apparatus comprising:

a triangular groove having a triangular cross-section and driving force transmission portion disposed in three vertex angles of the triangular groove;

the photosensitive drum driving member comprising a non-distorting protrusion axially extended from the end face of a drum shaft and engaged with the groove on the image forming apparatus driving member;

the protrusion having a position-limiting mechanism and a stressed mechanism;

wherein the position-limiting mechanism and the stressed mechanism are disposed at different positions;

and wherein a projecting tooth obliquely disposed on the non-distorting protrusion is taken as the stressed mechanism;

and the projecting tooth also having a mating surface engaged with the driving force transmission portion to transmit the driving force;

wherein a supporting disc and two protruding columns are disposed on the protrusion; the protruding columns are symmetrically distributed on both sides of the protrusion; a first protruding column is a projecting tooth engaged with the driving force transmission component; a second protruding column makes contact with an inner wall of the groove; the first protruding column is taken as the stressed mechanism; and the position-limiting mechanism comprises the supporting disc and the second protruding column.

2. A process cartridge, comprising a photosensitive drum,

wherein the process cartridge also comprising the driving force transmission mechanism according to claim 1 ;

and the driving force transmission mechanism disposed on the end of the photosensitive drum.