Get Running gear -> The steering Guide for Volkswagen Multivan SUV Fifth Generation (2003-2015)

Running gear

The steering

All T5 2010 vehicles are equipped with hydraulic

power steering.

Servotronic is available as standard for all Multivan

Highline vehicles and is an option for all other

T5 2010 models.

It is a feature of Servotronic that the steering support

is reduced as the vehicle speed increases. This

increases driving safety.

S453_072

More details about Servotronic is

available in self-study programme no. 277

"The Phaeton - running gear".

Steering column

Power steering hydraulic

pressure valve N315

Steering booster pump

Steering box

S453_081

34

Adjustable steering booster pump

The adjustable steering booster pump is mounted on

the engine below the alternator, and is driven by the

belt drive of the engine. It is used in all T5 2010

vehicles with a diesel engine.

Steering booster pump

S453_114

Structure and function

●

The adjustable steering booster pump operates

according to the functional principle of an

adjustable radial piston pump.

●

The adjustment enables the pressure of the

hydraulic pump to be adapted to the engine

speed, thereby ensuring that the delivery pressure

of the pump remains approximately constant.

Advantage: This avoids any unnecessarily high

power consumption by the hydraulic pump. As a

result, fuel consumption is reduced.

●

The pump has a cam disc, allowing the vanes to

be adjusted.

●

The delivery rate can be varied by the different

positions of the vanes.

Pressurised oil to

steering box

(output)

Input

from

servo oil tank

Control piston

Cam disc

Stroke adjustment

activation on both sides

Rotor

Outer ring

Vanes

(11 pieces)

S453_077

35

Running gear

Function

At idling speed …

the cam ring of the pump is pressed against the outer ring by spring force and the internal pressure conditions. This

produces the greatest possible delivery volumes on the suction and pressure sides. The delivery volume increases

as the rotation speed increases, in proportion to the rotation speed.

Oil tank

Control piston

Pressure relief valve

Rotor

to steering box

Throttle

Control line

Compression spring

Outer ring

Cam ring

Pressure hose

S453_078

As the rotation speed rises …

the pressure in the pump also increases. The pump pressure acts on one side of the control piston, and moves this to

the left against the spring force as the pressure increases. In a defined medium rotation speed range, the ducts to

the chambers between the outer ring and cam ring (left and right chambers) are closed by the control piston. This

equalises the pressure between the two chambers. The cam ring is held in a defined central position, the delivery

volume remains approximately constant.

Control piston

Right chamber

Left chamber

S453_080

36

As the rotation speed increases further …

The delivery volume and pressure increase if the rotation speed continues to rise. The control piston is pushed

further to the left against the spring force, and therefore the duct to the left chamber is connected to the suction

line. The opposite, right chamber has pump pressure applied to it. The cam ring is pushed to the left against the

spring force - the eccentricity between the rotor and the cam ring is reduced. The delivery volume is reduced,

thereby preventing "overproduction" of pressurised oil. The associated reduction in power consumption by the

pump means that energy consumption is reduced significantly.

Control piston

Cam ring

Outer ring

Left chamber

Right chamber

S453_079

37

Running gear -> The steering for Your Volkswagen Multivan SUV Fifth Generation (2003-2015)

Related Topics

Running gear

Popular Owner Manuals

Latest Owner Manuals