Definition of Four Wheel Drive:
On most cars only one of the axles is driven by the engine
. Vehicles which are also moved off-road, as well as for several forms of motor
sports, it is necessary to drive on both axles, to allow a (fast) headway also in difficult situations. Preponderantly two systems are in use: permanent all-wheel-drives use a central differential, that permanently allocates the engine
power on the two axles and usually disposes of a differential lock
; with coupling controlled all wheel drive
s, one axle is permanently driven, the other one is provided with drive power by a coupling only under certain circumstances or manually. The advantage is mainly the low price. All wheel vehicles need differentials on both axles.
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