BMW M5 Wartungshandbuch PDF herunterladen (Seite 32)

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9

VANOS Actuators

Separate adjustment units are provided for

each cylinder bank for the purpose of

adjusting the VANOS gear mechanism. These

adjustment units are known as the actuators.

The VANOS high pressure pump supplies

them with oil under high pressure.

Since, due to the gearwheel connection the

intake camshaft and exhaust camshaft rotate

in opposing directions, the intake is adjusted

towards advance and the exhaust towards

retard when the plunger extends.

The adjustment pistons are designed as

double-acting cylinders and differ with regard

to the adjustment range for the intake and

exhaust camshafts.

The stroke range on the exhaust side of

maximum 14.25 mm corresponds to

18.5° camshaft angle = 37° crankshaft angle.

The stroke on the intake side of maximum

25.25 mm corresponds to 30° camshaft angle

= 60° crankshaft angle.

When extended into the two piston chambers,

the adjustment pistons are subject to a

system pressure of 100 bar. They therefore

extend only due to the different piston surface

areas. The oil from the small piston chamber is

transferred into the high pressure circuit. The

proportional valve must be fully actuated in

order to extend the adjustment piston.

9 - Adjustment unit

Index Explanation

1 Adjustment direction, advance

2 Intake

3 Plug contacts

4 Exhaust

5 Adjustment direction, retard

10 - Stroke of adjustment piston

Index Explanation

1 Stroke

1 2 ... 27 28 29 30 31 32 33 34 35 36 37 ... 119 120

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