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THIS
STEERING
SYSTEM
HAS
THREE
DIFFERENT
FUNCTIONS
- Power
operation
i
rc,d/ic-/ici//
0 I .~/I c,r-i/lg-o
/Io.c,/
c'//or/
/
Stiffeninq
of the
steerinq
as a function
of the
speed
of the
vehicle
f
s////it-ic,r/t
/<,(,I
o/
11~1
c/c,c~ri/t.cq
r/~llc(,I
I//JNI(,I
or
lhc,
1 cjhicle
spc,c~d
)
1. Steering
pinion
5. Piston
seal
2. Rack
housing
6. Rack
3. Sleeve
7.
Rack
plunger
4. Piston
I
SECTION
THROUGH
RACK
AND
HYDRAULIC
RACK
CONTROL
UNIT
( OPERATING
CYLINDER
)
SECTION
THROUGH
HYDRAULIC
RACK
CONTROL
UNIT
( OPERATING
CYLINDER
)
a)
Hydraulic
rack
control
unit
( operating
cylinder
)
The
rack
is connected
to the
hydraulic
control
unit
( operating
cylinder
)
Assume
S as
the
piston
in chamber
1, and
S/ 2
its
surface
( ns
dcjsiguvd
iu
c-hmvhc
1' 2
J.
The
steering
is balanced
when
forces
F and
Fl
exerted
on each
face
of the
piston
are
equal
therefore
F = S x F
=Fl
+x
HP
HP
1 operatinq
pressure
of hydraulic
circuit
f
mist
s
l'ront
/hc
r-r/-iit
/I,,(
s.5~1'~~
lo
fhc
cf4I-r)ul
/~r~~.~.s~ir~~
J.
Movement
of the
rack
( therefore,
power
operation
) is ensured
by
a change
in pressure
inside
chamber
1, such
as
I Return
of fluid
to the
tank
-HP
/ 2 decreases
- Inlet
of fluid
-HP/
2 increases
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