Engine – Cayenne V8
Page 1.23
Vane Controller
The vane controller consists essentially of the stator (-A-), which is
installed on the crankshaft via the sprocket, the rotor (-B-), which is
installed on the camshaft, the inserted vanes and two lids. The sprocket
is mounted to the outer diameter of the stator. It is interlocked with the
crankshaft via the chain drive. The rotor is screwed securely to the
camshaft. Rotation is possible between the rotor and stator (inner
mounting of the controller). The rotation is limited by the vanes inserted
in the rotor and by the stops on the stator. The vanes also divide the
recesses on the stator into two separate chambers.
These chambers can be filled with oil via oil bores and oil passages in
the rotor. To guarantee secure sealing, small springs are installed
between the vanes and rotor. The chambers are each sealed off at the
sides with a lid fixed to the sprocket. The controller is locked at a stop
(retarded). To do this, a spring-loaded pin in the retarding device of the
controller moves into a bore in the lid. An interlocked connection
between the stator and the rotor is created for the engine’s starting
process. This locking prevents noises during the period before oil
pressure is produced.
Function
Two chambers, which act in different directions of flow, are contained in
the controller. Filling of one chamber turns the rotor with respect to the
stator. The rotor and the camshaft can be turned back into the original
position by filling the other chamber. The oil of the non-pressurize
chamber flows back into the chamber via the solenoid hydraulic valve.
If the oil supply and the oil return are interrupted at the solenoid
hydraulic valve (center position of the valve) during the filling of a
chamber, the controller remains at the position just assumed. The
chambers lose oil through leakage so that the controller leaves its
position. The solenoid hydraulic valve is controlled correspondingly by
the control unit, and the controller returns to the desired position.
A - Stator
B - Rotor
A - Stator
B - Rotor
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