TORQUE DISTRIBUTOR

A torque distributor includes a friction-drive mechanism having a first roller rotatable together with a first rotary member, partly constituting a torque-transmission path to primary drive wheels, and a second roller rotatable together with a second rotary member, partly constituting a torque-transmission path to secondary drive wheels. Also provided is an eccentric-crank mechanism for revolving the second roller in a direction opposite to a rotation direction of power transmission of the second roller around an eccentric-shaft axis displaced from a second-roller rotation axis to produce a displacement of the second roller from a non-power-transmission position of non-frictional-contact with the first roller to a radially-loaded power-transmission position of frictional-contact with the first roller. Although the friction-drive type is used, the torque distributor enables torque-distribution-control mode switching between them, while ensuring high-precision torque-distribution control by avoiding a polarity of moment acting on a rotational-position-control system for an eccentric crank from being reversed.