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Fig.6-34.
Princ
iple of funct ion
,
left-hand turn
through the return groove (6) of the controi valve (10)
back to the oil container (13).
Oil is conveyed under pressure from the pump into
an annular chamber round the valve housing (the
'
I arge circle in the cross-section). In the neutral posi-
tion (Fig. 6-33) the valves (9 and 10) are so adjusted
that oil can pass the intake ports (8 and 11) and flow
on to the annular grooves (18 and 19) in the valve
housing. From here the oil is l.ed partly to both
sides
of the piston (2) through the channels (18 and 19), and
partly -
as long as the valves are in the neutral
position -
to both the return grooves (6 and 7) a'f
the controi valves. From the return grooves oil flows
through the return channel back to the container.
When the steering wheel is turned to the left (see Fig.
6-34) movement is transmitted via the controi spindle
(16) and the torsion rod (17) to the steeringcam
(15),
so that the piston (2) is screwed to the left in the
figure (downwards in the vehicle). Since the torsion
rod is resilient, the steering spindle will be turned in
relation to the steering cam and thus influence the
valves placed in the cam. The greater the turning
movement, the greater will be the valve
displacement.
One of the controi valves (9) is then displaced to the
6: 20
right and opens the intake port (8) wider, while at
the same time the other controi valve (10) is dis-
placed to the left and closes the intake port
(11).
The
delivery line of the controi valve (9) is linked with the
annular groove (19) in the valve
housing.
This also
applies to the return groove (6) of the controi valve
(10).
The delivery line of the controi valve (10) is con-
nected to the annular groove (18) and to the return
groove (7) for the controi valve (9).
Under such conditions, oil under pressure flows in
through the intake port (8) to the annular groove (19)
and then on to the cylinder on the right-hand side of
the piston (2). Oil al,so flows to the return groove (6).
Since the outlet port is blocked, pressure will rise and
assist in pressing the piston (2) to the left.
Oil in the left-hand section of the cylinder is forced
away via the annular groove (18) in the valve housing
to the intake port (11) which is closed. A.t the same
time, oil flows to the return groove (7) and then
through the return line to the oil container.
As soon as the front wheels are turned to the desired
angle and the forces operating on the steering wheel
become less, the controi valve returns to neutral posi-
tion as a result of the influence of the torsion rod.
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