Toyota
Ford Kuga
 Service Manual
Rear Drive Axle/Differential » Rear Drive Axle and Differential (System Operation and Component Description)
Pressure control - 4th generation Haldex clutch

Pressure control - 4th generation Haldex clutch

Item Description
1 Haldex clutch fluid
2 Inlet filter
3 Electric feed pump
4 Filters
5 Pressure accumulator
6 Control valve
7 Dished washer
8 Ring piston
9 Clutch plate pack
10 Return pressure accumulator
11 Return control valve

Full torque is available at any time on the 4th generation Haldex clutch because the pressure is not dependent on the difference in the speeds of rotation. This is used for instance to activate the Haldex clutch for better traction when moving off.

On the 4th generation Haldex clutch, the preload function which applied 80 Nm to the plates in the 3rd generation is no longer required.

On request from the control unit and at engine speeds above 400 rpm, the electric feed pump runs and maintains the storage pressure at about 30 bar.

A pressure reducing valve acts as a control valve, allowing the all-wheel drive control unit to control the pressure with much greater precision. The all-wheel drive control unit monitors the position and function of the control valve. The control valve distributes the pressure, depending on the requirements, across its three outlet openings (storage pressure, working pressure, return).

From the storage pressure (30 bar) and depending on the requirements, the control valve regulates a working pressure of 0 - 17 bar, which is applied to the ring piston. At 17 bar working pressure, the maximum torque of 1000 Nm is transferred to the rear wheels. The all-wheel drive control unit ensures the best possible performance under all driving conditions, for all road conditions and independent of the speed.

    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

    Ford Kuga Service Manual / Rear Drive Axle/Differential / Rear Drive Axle and Differential (System Operation and Component Description) / Pressure control - 4th generation Haldex clutch

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