GKN Driveline has announced the first production application of its torque vectoring technologywhich it supplies to ZF for the recently announced ‘Vector-Drive’ rear axle, planned for future BMW vehicles.
Two torque vectoring hardware units per axle provide the requested vectoring torque by a superimposition planetary gear set electronically controlled at the ZF system level by an electric motor actuated clutch.
Actuator hardware is a wet clutch and two-stage ball ramp mechanism to achieve the accuracy within the required response time.
The gears of the planetary gear set are only active when needed for best fuel efficiency. The wet clutch is designed for high thermal capacity and very low drag torque. Various unique features including the design of the gears and the ball ramp have been patented.