Patent ID: 7083033

Claim:
A torque transmission apparatus comprising: a casing; a first rotational member disposed in the casing; a second rotational member disposed relatively rotatable to the first rotational member; a frictional engagement portion provided between the first and second rotational members for transmitting torque according to an engaging force; a pressurizing member, including first and second members relatively rotatable to each other, that produces a thrust through relative rotation between the first and the second members for bringing the frictional engagement portion into friction engagement; an actuator supported on the casing for rotationally driving at least one of the first and second members to generate the relative rotation; a penetrating portion formed in the first rotational member and facing the pressurizing member; and a transmission member disposed in the penetrating portion and interposed between the pressurizing member and the second rotational member, for transferring a thrust of the pressurizing member to the second rotational member.