VEHICLE POWER TRANSMISSION DEVICE

In a transfer (22), a high thrust can be given to a front-wheel driving clutch (50) by a high magnification function of a screw mechanism (86). Further, a necessary stroke for an operation of a high-low switching mechanism (48) can be obtained by the screw mechanism (86). Accordingly, with the use of one motor (84), the screw mechanism (86), and a transmission mechanism (88), it is possible to perform a switching operation of the high-low switching mechanism (48) and a torque adjustment of the front-wheel driving clutch (50) by the same system. Hereby, it is possible to perform, with accuracy, the switching operation of the high-low switching mechanism (48) and the torque adjustment of the front-wheel driving clutch (50), based on a motor rotation angle Am of one motor (84).