Patent ID: 7601089
Filing Date: 2009-10-13
Classification: B60K,B60W,F16H

Abstract:
1. A motor vehicle, comprising: a powertrain operable for generating drive torque; a primary driveline for transmitting drive torque from said powertrain to first and second primary wheels; a secondary driveline for selectively transmitting drive torque from said powertrain to first and second secondary wheels, said secondary driveline including an input shaft driven by said powertrain, a first axleshaft driving said first secondary wheel, a second axleshaft driving said second secondary wheel, and a drive mechanism disposed between said input shaft and said first and second axleshafts, said drive mechanism including a differential, a speed changing unit, first and second mode clutches and a brake unit, said differential having an input component driven by said input shaft, a first output component driving said first axleshaft and a second output component driving said second axleshaft, said speed changing unit having a gearset driven by said input component and a transfer shaft driven by said gearset, said first mode clutch is operable for selectively coupling said first output component for rotation with said transfer shaft, said second mode clutch is operable for selectively coupling said second output component for rotation with said transfer shaft, and said brake unit is operable for selectively braking a component of said gearset; and a control system for controlling actuation of said first and second mode clutches and said brake unit.