DRIVING FORCE TRANSMITTING DEVICE

PROBLEM TO BE SOLVED: To provide a driving force transmitting device capable of reducing a dragging torque caused by rotation difference between front and rear wheels. SOLUTION: A cam mechanism is provided with a forward rotation plate 46 and a reverse rotation plate 47. The respective plates 46 and 47 are energized by the respective coil springs 57a to 57f in the directions opposite to each other. When the number of rotations of the front wheels becomes large relative to the number of rotations of the rear wheels, the forward rotation plate 46 rotates and a main cam 32 energized toward the rotation of the forward rotation plate 46 by the respective coil springs 57a and 57d toward the neutral position rotates integrally with the forward rotation plate 46. When the number of rotations of the rear wheels becomes large relative to the number of rotations of the front wheels, the reverse rotation plate 47 rotates and the main cam 32 energized toward the rotation of the reverse rotation plate 47 by the respective coil springs 57b, 57c, 57e and 57f toward the neutral position rotates integrally with the reverse rotation plate 47. COPYRIGHT: (C)2008,JPO&INPIT