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SERVO STEEIUNG
As a
ltern ative,
this vehicle can be f itted w ith
th
e ZF
recircul,atin
g cam and ba
ll nut
type se
rvo steering.
The
mai n
components
of th
e se
rvo system
are
th
e
stee
ring box, servo pump and oil container with
filter.
These
are connected
to
the
various
oil
lines,
see Fig.
6-32. From the pitman arm
the
servo steering system
is
similar to the mechanical steering arrangement, see
Fig.6-29.
The number of steering wheel turns from
lock to
lock
is
3.7.
Steering
gear
CONSTRUCTION
The steering gear
is
of the cam and roller type.
In
addition to
the
mechanical section,
the
servo
cylin
-
der and controi valves are built
into
the steering box.
The
lower
part of the
steeri1
ng box
(l
Fig.
6-33)
is
in
the shape of a cylinder
in
which
the
p iston
(2) is fitted.
On the
one
side piston
is
in th
e
form of a rack
gear which meshes with the tooth segment of the p it-
man arm shaft (20).
The axia
l movem ent of th
e
piston which determines
the direction the wheel turn,
is
obtained via steering
cam
(S)
and ball
nut.
The recircu lating
balls
(4)
are
located in
annular grooves and
form the thread for
the nut. Movement of the
steering cam comes from
the
steering co
lumn
at
the
contro
i
spindle (16) and
the torsion
rod
(1 7)
secured in the spind ie. The sfeer-
ing
cam
is journalled in the upper
section
of the
steering box partly
by means of
an axial
thrust needle
bearing
and
partly by means of a taper ball bearing.
The
inner
race of the taper ba
ll
bearing
also
is an
outer race for the double
needle bearings of the
controi spindie.
Located
in
the
upper
part of
the
steering cam are
the controi valves (9 and
10): they
are
drawn out in
the figures. These valves are
influenced
by two pins
in
the
lower
end of the controi spind le
(1
6).
Fig. 6-32. Servo steering
1.
Servo pump
4.
Oil container with filter
2.
Delivery oil line
5. Return oil line
3. Pump suc1ion line
6. Steeri ng box
6
:
18
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