Power Steering Pump (1998-1999): Function
The pump rotor has 10 loose laminated vanes and rotates in a ring shaped distancer. The laminated vanes are pressed against the walls of the distancer by centrifugal force and oil pressure.
The area of inside the distancer is oval, see illustration A. Because of this the space between the rotor, distancer wall and two of the vanes changes when the rotor rotates.
When a pair of vanes move from the suction side to the pressure side the space between them increases and oil is sucked in.
The vanes move onto the pressure side. The gap between the vanes decreases at the same time the pressure increases and the oil is forced out into the delivery pipe.
There are two suction and pressure channels which gives the pump double capacity.
Low pressure fluid High pressure fluid
A. Fluid flow with steering gear in neutral position
B. Oil flow with steering gear under load
- Rotor
- Distancer
- Outer wall
- Safety valve
- Control valve