FRONT TO REAR TORQUE VECTORING AXLE WITH OVERSPEED CAPABILITY FOR VEHICLE DYNAMIC CONTROL SYSTEMS

摘要

A torque bias coupling ( 50 ) for proportionally transferring driving torque to a rear secondary axle ( 18 ) of a front wheel drive based all-wheel-drive vehicle platform includes a double-planetary gear set ( 54 ) organized about a common axis (X) and a magnetic particle brake ( 56 ). The magnetic particle brake ( 56 ) is operatively coupled to a planet carrier ( 62 ) of the double-planetary gear set ( 54 ) to selectively apply a rotational reaction force there to. Regulation of the rotational reaction force enables selective transfer of torque from the vehicle driving motor ( 6 ) to the rear secondary axle ( 18 ) via the torque bias coupling ( 50 ). The configuration of the double-planetary gear set ( 54 ) enables the secondary rear axle ( 18 ) to be driven in an over-speed condition relative to the front primary axle ( 14 ) in order to improve vehicle dynamics.