Torque transmission mechanism

This torque transmission mechanism (A) for an internal combustion engine, adapted to transmit a starting torque from a starter motor to a crankshaft (4) of the internal combustion engine, comprises a ring gear (2) that transmits the starting torque and a one-way clutch (8) disposed between the ring gear (2) and the crankshaft (4), the one-way clutch (8) including an inner ring (7), an outer ring (84) and sprags (86) adapted to cooperate with the inner (7) and outer (84) rings to selectively transmit torque between the inner (7) and outer (84) rings or allow relative rotation between the inner (7) and outer (84) rings. The one-way clutch (8) comprises a single cage (88) in which the sprags (86) are mounted, and the sprags (86) are adapted to lose contact with the inner ring (7) when the inner ring (7) rotates (R2) at a rotation speed inferior to the rotation speed of the outer ring (84).