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Fig. 6-35.
Function, right-hand
turn
Turning the steering wheel to the right (see Fig. 6-35)
will screw the piston (2) to the right on the figure.
The controi valve (10) is displaced to the right and
permits oil under pressure to pass to the annular
groove (18) of the valve housing and from there on
to the left-hand side of the cylinder. Oil under pres-
sure also flows to the return groove
(7)
which, how-
ever, is closed so that oil pressure on the left-hand
side of the operating piston (2) rises and facilitates
the turning of the lever shaft. Oil at the right-hand
section of the cylinder is pressed by the piston via
the annular groove (19) through the return groove
(6)
of the controi valve (10) back to the oil container (13).
Servo pump
The
servo
pump
(Fig.
6-36) is of the vane type
.
It is
mounted on a bracket on
the
left-hand side of the
engine and is pulley-driven by the engine at engine
speed.
The pump rotor is provided with 10 loose vanes and
rotates in a circular-shaped intermediate piece. The
vanes are pressed against the wall of the interme-
diate piece partly by centrifugal force and partly by
oil pressure.
The space in the intermediate piece is oval, see Fig.
6-35. This permits the area between the rotor, the wall
of the intermediate piece and two of the vanes to
6
:
21
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