Patent ID: 7758463

Claim:
A power transmitting apparatus for performing switching between 2-wheel and 4-wheel drive modes and locking and unlocking of differential mechanism by an operational shaft comprising: an input shaft connected to an engine of a vehicle and rotated around a rotational axis; left and right side output shafts configured to drive front wheels or rear wheels of the vehicle when a driving force is transmitted from the input shaft; a differential mechanism arranged between the input shaft and the output shafts and configured to absorb the difference of rotation between the output shafts by differential action thereof; an operational shaft configured to connect and disconnect the input shaft from the output shafts by connecting and disconnecting the input shaft and the output shafts and being configured to lock and unlock the differential mechanism; a driving device configured to drive the operational shaft; and a main case mounted on the vehicle and containing the differential mechanism and the operational shaft therein, wherein the driving device comprises: a reversible motor; a rotational member rotationally driven by the motor and provided with a contacting member; a spring arranged on the rotational member; a connecting member arranged to be abutted by one end of the spring so as to be rotated by the rotational member via the coil spring; a driving shaft rotatably arranged relative to the rotational member and engaged by the operational shaft in its rotational direction and adapted to be rotated by the rotational member via the connecting member; a stay engaged by the driving shaft in its rotational direction and provided with a contacting member; a substrate arranged so as to be contacted by the contacting members respectively of the rotational member and the stay and formed with a conducting patterns forming predetermined electric circuits in accordance with the rotational angles respectively of the rotational member and the driving shaft, said rotational member, connecting member, stay and substrate being formed as separate parts and adapted to be assembled to the driving shaft in order.