Patent ID: 8459149

Claim:
A driving force distribution device, comprising: a sub transmission for switching motive power to an input shaft between at least two levels, a high speed and a low speed, and transmitting the motive power to a primary output shaft; a friction clutch for transmitting the motive power of the primary output shaft to a secondary output shaft; a rotary drive member fixed to an output shaft of an actuator; a friction clutch driving cam coaxially and relatively rotatably arranged at one end portion of the rotary drive member to change a pressing force of the friction clutch; a shift cam coaxially and relatively rotatably arranged at another end portion of the rotary drive member to shift the sub transmission by converting rotary motion of the actuator into linear motion; and a ratchet lever provided so that a shaft line thereof in a normal direction with respect to the outer surface of the rotary drive member is a rotation center, wherein the ratchet lever is disengaged from the shift cam and is rotated when the rotary drive member is rotationally driven to one side from a predetermined position starting at control origin of the shift cam, and the ratchet lever is rotated in conjunction with the shift cam when the rotary drive member is rotationally driven in a direction opposite to the one side.