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

Base pressure

Item Description
A Barometric Pressure
B Base pressure
C Increased base pressure (preload)
Base pressure Operating pressure

The hydraulic fluid is drawn from the sump of the hydraulic system and directed through a filter. The feed pump pressurises the system and pumps hydraulic fluid into the pump plungers. This base pressure of 4 bar presses the rollers for the pump plungers against the cam disc. At the same time, hydraulic fluid flows into the working piston. This eliminates the play in the clutch plates. The Haldex clutch can respond quickly and distribute the torque within fractions of a second. The spring force in the pressure accumulator determines the base pressure of 4 bar and compensates pressure fluctuations. A compensating spring works in the opposite direction and prevents the plate discs becoming blocked by the force of the working piston. This restricts the transferable torque to approx. 7 Nm. This value can, however, deviate slightly due to temperature and/or the difference in speed between the input and output shafts.

    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) / Base pressure

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