Volkswagen Multivan 2010 Service Training page 37

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.
Left chamber
Control piston
Cam ring
Outer ring
Right chamber
S453_079
37