Toyota
Ford Kuga
 Service Manual
Rear Drive Axle/Differential » Rear Drive Axle and Differential (System Operation and Component Description)
Haldex clutch

Haldex clutch

General overview

Haldex clutches of the 3rd and 4th generations are used in the Ford Kuga.

The development of the third generation Haldex clutch represents a big step forward in modern all-wheel technology. The Haldex clutch is electro-hydraulically controlled. Additional information is taken into consideration during control tasks via the all-wheel drive control unit.

Slip alone is no longer decisive for the distribution of the propulsive forces; the vehicle's driving dynamics are also taken into consideration. The control unit accesses the driving-related data via the data bus. With this data, the control unit has all the essential information about speed, cornering, coasting or traction operation, and can optimally react to every driving situation.

Compared with the previous generation, the 4th generation Haldex clutches operate with higher pressure and achieve shorter response times when distributing the drive forces.

Advantages of the Haldex clutch:

  • Permanent all-wheel drive with electronically-controlled multi-plate clutch
  • Fast response
  • No straining when parking and manoeuvring
  • Compatible with different tyres (e.g. emergency spare wheel)
  • Fully combinable with driving dynamic control systems

The driveshaft is connected to the input shaft of the Haldex clutch. Within the Haldex clutch, the input shaft is separated from the output shaft to the rear axle differential by means of a multi-plate clutch. Torque is only transmitted to the rear axle differential when the plate assembly of the Haldex clutch is closed.

The multi-plate clutch is electro-hydraulically controlled via the all-wheel drive control unit. For ecological driving, the torque to the rear axle is reduced to a minimum up to a throttle position of approx. 50%. A prerequisite for this is that there is no difference in speed in the Haldex clutch between the input and output shafts.

Operation

Operation

Item Description
1 Output shaft
2 Working piston
3 Plates
4 Ring piston pump
5 Control Valve
6 Input shaft

Within the Haldex clutch is a plate assembly and a so-called ring piston pump with a pump plunger and a working piston.

Fluid supply is started if there is a speed difference between the input and output shafts.

This fluid pressure is transmitted to the working piston and in this way the plate assembly is compressed.

    More about «Rear Drive Axle and Differential (System Operation and Component Description)»:

    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

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