Ford Kuga

 Service Manual

Rear Drive Axle/Differential » Rear Drive Axle and Differential (System Operation and Component Description)
Driving situations

Pulling away and accelerating

• When pulling away and accelerating, as much all-wheel drive as necessary must be available immediately in the short-term. During acceleration, the electronic system detects slip at the front axle. This slip is counter-controlled and thus the propulsive force optimally distributed to the two axes.

Cornering

• A sporty driving style, in particular dynamic cornering, demands stable cornering behaviour.

  The all-wheel system distributes the propulsive force to all four wheels and by so doing boosts the high cornering forces so that the vehicle makes optimum contact with the road surface.

Snow and black ice

• Snow and black ice require particularly high grip.

  Under these conditions, the Haldex clutch always distributes the propulsive force to the axle with the better traction. The all-wheel system reacts intelligently and quickly to all driving situations.

Trailer operation

• When driving with a trailer, the trailer weight (support load) is transmitted to the rear axle via the towbar. This reduces the load on the front wheels, which means they can slip. The electronic system detects this difference and distributes most of the propulsive force to the rear axle.

General Information

Driving situations

Haldex clutch

Design of the 3rd generation Haldex clutch

Design of the multi-plate clutch

All-wheel drive control unit

Electric feed pump

Pressure control - 3rd generation Haldex clutch

Base pressure

Increased base pressure (preload)

Pressure build-up

Design of the 4th generation Haldex clutch

Pressure control - 4th generation Haldex clutch