Single-circuit power steering when driving straightahead, function

B46.25-0003-05

Diagram of the hydraulic power steering circuit in straight ahead driving position

1a, 1b Stroke limiting valve

2 Valve case

5 Torsion bar

6 Star valve

7 Pressure limiting valve

9 Rotor

10 Hydraulic power steering pump

11 Hydraulic oil reservoir

13 Distribution cover

14 Distribution cover

A Star valve section view

B46.20-0037-04

Stroke limiting valve in straight ahead drive position

1a, 1b Stroke limiting valve

12 Work piston

A Bottom work chamber

B Top work chamber

Operation

In the straight ahead drive position and with a balanced forces relation in the valve case (2), the rotor (9) of the star valve (6) is immobilized, by the torsion bar (5), in the center/neutral position in relation to the distribution covers. The oil flow supplied by the hydraulic power steering pump (10) comes easily to the return tube through the star valve (6).

The same compression ratio actuate in the work chambers (A and B).

The stroke limiting valve (1a, 1b) and the pressure limiting valve (7) are closed.