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Steering System
Operation
Rotary movement of the steering wheel is transferred via
the steering column to the valve unit which is mounted on
the steering rack. The rotary movement of the steering is
1. Rotor
2. Torsion bar
3. Outer sleeve
4. Flow to hydraulic cylinder
With no movement of the steering wheel being applied, fluid
flows from the pump to the valve unit. The slots in the outer
sleeve and the rotor are aligned so that the fluid pressure flows
across the valve unit. Some pressure is applied to the feed and
return ports which in turn is felt at either side of the piston in
the hydraulic cylinder. With the forces equal on each side of
Version 2.0
converted into linear movement of the steering rack through
the rack and pinion.
Neutral Position
5. Flow from pump
6. Return to reservoir
7. Flow from reservoir
the cylinder, the steering remains in the neutral position. The
majority of the fluid delivered from the pump is returned from
the valve unit, and via the fluid cooler, back to the reservoir.
With the majority of the fluid being returned to the reservoir,
the pressure available at each side of the piston is very low.
Front Wheel Steering
520
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