SSP_331_d2.pdf

Nitrogen gas

How it works

Diaphragm

When the hydraulic fluid is pumped into the

pressure accumulator via the

non-return valve, pressure in the system rises in

relation to the volume of fluid pumped. The

nitrogen gas

is compressed and the volume of the gas

chamber diminishes. The fluid volume rises at the

same rate until the cut-off pressure is reached.

Pressure in the accumulator is maintained by the

non-return valve and is supplied to the

anti-roll bars via a duct.

Hydraulic fluid

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Pressure accumulator

Non-return valve

Hydraulic unit pressure

sensor for anti-roll bar

uncoupling

Anti-roll bar

uncoupling motor

Electric motor

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To protect the pressure accumulator, pressure in the system must be over 70 bar during the

coupling operation.

Design and function

Hydraulic unit pressure sensor for anti-roll bar uncoupling G486

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The hydraulic unit pressure sensor for anti-roll

bar uncoupling monitors system pressure over a

range of 0 bar to 250 bar.

The pressure accumulator is recharged if the

pressure drops below a minimum of 90 bar when

the anti-roll bars are uncoupled, or when the

anti-roll bars are coupled and the gearbox is

switched to "low".

Design

The sensor consists of the sensor electronics (b)

and a piezoelectronic element (a) which reacts to

the hydraulic fluid pressure.

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How it works

The hydraulic fluid pressing on the piezoelectric

element changes the charge distribution in the

element.

Without the action of pressure, the charges have

an even distribution (1). If pressure starts to act,

the charges change their physical position (2).

This generates an electrical voltage.

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The higher the pressure, the more the charges

are separated. The voltage rises. It is amplified

by the electronic circuits and sent as a signal to

the anti-roll bar control unit.

The voltage intensity is therefore directly

proportional to the hydraulic pressure.

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Design and function

Anti-roll bar uncoupling motor V326

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Coupling piece flange

The anti-roll bar uncoupling motor is driven by

the electric motor via the coupling piece.

It draws hydraulic fluid out of the expansion tank

and pumps it to the pressure accumulator via a

non-return valve.

Oil flow in the pump

To pressure accumulator

Coupling piece

Gear wheels

Coupling

piece flange

Intake duct from

expansion tank

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How it works

To p re s s u re

accumulator

The anti-roll bar uncoupling motor is a gear

pump. The opposing rotary motion of the two

gear wheels pumps the hydraulic fluid along the

outside of the housing wall.

Pressure chamber

Housing wall

A definite volume of hydraulic fluid is taken in

depending on the volumetric space between the

teeth and the housing wall. This volume is then

pumped in the direction of rotation of the gear

wheel.

Gear wheels

The two gear wheels intermesh in the middle.

The volumetric space becomes smaller and the

hydraulic fluid is pressed out of the volumetric

space. Pressure then rises in the pressure

chamber. When the pressure has risen

sufficiently, the non-return valve opens and the

hydraulic fluid is pumped to the pressure

accumulator.

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Intake duct from

expansion tank

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Volumetric space

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