TM 5-3810-307-24-1-2
As a result, the pressure oil is now routed only to one side of the double side power cylinder. Under
influence of the pressure difference in power cylinder an axial force will act on piston rod. The
direction in which the piston rod is moving is respectively controlled in such a manner that it will
follow the movement of the steering linkage which is generated by turning the steering wheel, and
will thereby support the steering movement.
When the steering wheel is released, the cup springs will make sure that the valve returns back to
its neutral position.
A cross-type disk provides longitudinal compensation between steering spindle and worm,
preventing transmission of the worm's axial movement to the steering column.
If a force acts in the reverse direction from the wheels to the steering linkage while the driver is
holding the steering wheel in its position, the worm is again axially displaced; now, however, the
hydraulic support is acting in the opposite direction and absorbs the impact and will thereby relieve
the driver.
But if a force is transmitted from the direction of the wheels to the steering gear and the steering
wheel is released, e. g. while driving around a bend, the worm will not be displaced axially owing to
the preload of the springs, but will automatically perform a rotary movement.
The force of the cup spring preload is therefore important for the return movement of the steering
system.
Legend for Figure 1
A.
Two-chamber Oil Reservoir
H.
Pressure Limiting Valve
B.
Pressure Oil Pump, engine-driven
I.
Not used
C.
Pressure Oil Pump, drive-dependent
J.
Not used
D.
Not used
K.
Not used
E.
Valve Unit comprising:
L.
Steering Limit Valve
a. Flow Rate Indicator
M.
Not used
b. Supplementary Valve
N.
Sector Shaft
c. Check Valve
O.
Steering Nut
d. Check Valve
P.
Worm
e. Remote Control Valve
Q.
Steering Spindle
F.
Check Valve
G.
Replenishing Valve
Change-1 H-9
