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full time all wheel drive with viscous coupling locking planetary gear differential.

Figure: Escort RS2000 center differential

Figure: ford escort rs2000 transmission

Haldex generation III or generation IV proactive automatic all wheel drive.

Figure: Haldex unit generation III (left) and generation IV (right) on Ford Kuga

Figure: Ford Kuga Haldex generation III unit

Figure: Ford Kuga Haldex generation IV unit (May 2009)

Figure: ford kuga transmission

Source: https://fkclub.ru/forum/viewtopic.php?p=18485

automatic all wheel drive

Multi-plate clutch pack between the front and rear differentials. In normal conditions, the clutch pack would not be engaged so that only the front wheel would be driven for maximum fuel economy. The all-wheel drive system, however, would continuously monitor traction inputs and, if it determined that rear-wheel drive was needed, engage the clutch to increase torque to the rear axle in a linear fashion up to a 50:50 front:rear torque split.

All-wheel drive Kuga models also had a Torque Vectoring Control function which could apply the brakes to the inside front wheel when cornering to effectively transfer torque to the opposite wheel and thereby reduce understeer.

Source: Australian Car Reviews

Automatic all wheel drive system. Same as Ford Escape in USA.

locking center differential activated by a switch on the dashboard.6 The AWD system normally sends most of the power from the engine to the front wheels. If slipping is detected at the front, more power will be sent to the rear wheels in a fraction of a second. The four wheel drive system was a newer version of Ford's "Control Trac" 4x4 system, dubbed the Control Trac II 4WD in the Escape. This system allowed the front wheels to receive 100% of the torque until a slip was detected. Using a Rotary Blade Coupling, the rear wheels could be sent up to 100% of the power in fractions of a second. When switching the system from "Auto" to "On," the front and rear axles are locked at a 50/50 split; the reaction time necessary to engage the rear wheels is reduced via an integrated bypass clutch.

Figure: ford escape first generation 4x4 logo

Figure: ford escape first generation 4x4 switch

full time all wheel drive with 58/42% torque split (front/rear) via free (non-lockable) planetary gear differential.

Figure: Ford Mondeo gen. I planetary gear center differential and all wheel drive layout

full-time all wheel drive with viscous coupling locking planetary gear center differential. 37/63 front/rear ratio.

The constant drive was realized as follows. Behind the common 5-speed gearbox, the ZF transfer gearbox with interaxle differential was mounted. Planetary gear set of the interaxle differential distributed the torque in 37/63-front/rear ratio. The differential included viscous coupling with lock-function. To the rear, the transfer gearbox extended in two-section cardan shaft propelling the rear axle with bevel gear differential and axle shafts with CV joints. The rear axle differential included viscous coupling with lock-function for improved traction. Front axle propulsion comes out of the transfer gearbox aside the engine axe. There is a 1:1 chain transmission.

The transfer gearbox is connected to front bevel gear differential using short cardan shaft. The front differential is mounted on crankcase, therefore the propulsion of front left wheel must have been constructed using a shaft leading through crank case. The shaft was split into two parts to ensure smooth and reliable operation. The parts used in this configuration are rather special and therefore expensive.

On all 4WD cars, the most powerful motors were mounted only, at first 2.8 (till 1987, very rare car), then 2.9litr (engine equipped with catalys. has torque - 229 Nm, than 222 Nm, at standart engine). Also You can understand that you have business with 4x4 before 1990, thanks to black windows ornament. Also 4x4 version was produced as GL and as Ghia set. After 1990 only in GL version (not in England). All 4x4 cars was equipped with 5-speed manual gearbox. Main bodyes was: hatch and saloon, but there was also Tournier version, but it's a very rare car, I have met only 1 in my life.

Oh, yes, 4x4 technic was designed by Fergusson, it's very famous firm, and it's helped to Ford with Sierra 4x4 also.

Figure: ford sierra 4x4

A - rear axle

B - epicycle drive

C - viscomate

D - drive chain in the distributive drive

E - gearbox's band wheel shaft

F - driving shaft to the front axle's distributive drive

G - front axle's distributive drive

H - front axle

Source: www.fordscorpio.ee

Full-time all wheel drive with viscous coupling locking planetary gear center differential. 40% front / 60% rear (35/65% ??) torque distribution under normal conditions.

Figure: Sierra 4x4 layout

Figure: ford sierra

Figure: ford sierra

Figure: Sierra 4x4 front differential

Figure: Fergusson type center viscous coupling (5) locking differential (4)

Figure: ford sierra front differential

Figure: ford sierra rear differential

Figure: ford sierra rs cosworth 4x4

Figure: ford sierra transmission

Figure: ford sierra xr 4x4

Automatic all wheel drive. Normally rear wheel drive vehicle. When rear wheels slip, torque is transferred to the front wheels via two multi plate clutches, installed in the front axle - one clutch for each of the front wheels. Each clutch incorporates an Eaton-type oil pump.

Figure: ford transit

Figure: ford transit x

Figure: ford transit xx

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