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A transfer case that allows alternating between 2-wheel drive and 4-wheel drive modes but lacks a center differential for coordinating axle speeds is known as "part-time". Some vehicles, such as all-wheel-drive (AWD) sports cars, have transfer cases that are not selectable, known as "full-time". Such a transfer case is permanently "locked" into ...
A four-wheel drive, also called 4×4 ("four by four") or 4WD, is a two-axled vehicle drivetrain capable of providing torque to all of its wheels simultaneously. It may be full-time or on-demand, and is typically linked via a transfer case providing an additional output drive shaft and, in many instances, additional gear ranges .
A two-wheel drive vehicle has two driven wheels, typically both at the front or back, while a four-wheel drive has four. A steering wheel is a wheel that turns to change the direction of a vehicle. A trailer wheel is one that is neither a drive wheel, nor a steer wheel. Front-wheel drive vehicles typically have the rear wheels as trailer wheels.
The Quadra-Drive system was introduced in 1999 and is based on the Quadra-Trac II system but adds gerotor differentials to the front and rear axles to create a four-wheel drive system capable of not only directing torque to the axle with the better traction but to the individual wheel on an axle with better traction.
At each wheel station a bevel box drives the half shaft out to the wheel. Unlike a typical transfer box for permanent four-wheel drive , there is no differential action front-to-back. When used for equally spaced wheels (i.e. rather than cargo trucks with close-set rear axles) the front two wheels are arranged so that both steer, the rear less ...
Particularly in North America for several decades, the designation AWD has been used and marketed – distinctly from 4×4 and 4WD – to apply to vehicles with drive train systems that have permanent drive, a differential between the front and rear drive shafts, and active management of torque transfer, especially following the advent of the anti-lock braking system (ABS).
As noted above, the SH-AWD can take 100% of the power shunted through the rear differentials and variably direct power to each wheel, up to 100% of that power to the outside rear wheel. Adding power to the outside rear wheel on a turn has a steering effect on the vehicle which can greatly improve vehicle handling dynamics through the reduction ...
The original quattro centre differential (1980). Volkswagen Group has been developing four-wheel drive (4WD) systems almost since its inception during the Second World War.The Volkswagen Kübelwagen, Volkswagen Schwimmwagen, and Volkswagen Kommandeurswagen were all military vehicles which required all four road wheels to be "driven", the latter being a 4WD Volkswagen Beetle.