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System DescriPtion
Steering Gearbox
it
The rack,and-pinion type steering gearbox has a Valve body unit incorporated with the
pinion to control the steering fluid
pressure. steering fluid from the pump is regulated by a rotary valve in the valve body unit and is sent
through the cylin-
d e r p i p e t o t h e p o w e r c y | i n d e r , w h e r e h y d r a u I i c p r e s s u r e i s a p p | i e d . T h e s t e e r i n g f | U i d i n t h e o t h e r s i d e o f t h e p o w e r c y | i n -
der returns through the cylinder pipe and valve body unit to the reservoir'
Valve Body Unit
Inside the valve body unit is the valve, which is coaxial with the pinion shaft, and controls the steering
fluid pressure The
valve housing ls connected wirh the fluid pipe from the pump. return pipe to the reservoir, and the
two cylinder pipes
from the respective power cylinder.
The pinion shaft is double - structured with the input shaft connected to the pinion gear, both of which are
interconnected
with the torsion bar.
The pin inserted in the valve and the pinion shaft groove engage; this allows the pinion shaft to rotate together
with the
Because of this construction. the difference in angle in the circumferential direction between the input shaft
and the valve
becomes larger according ro the torsional strength ol the pinion or steering resistance. However.
maximum torsion
between the shafts is regulated by the engaged splines of the shafts at the pin engagement section to
hold the torsion bar
within the set value.
This allows the steering system to function as an ordinary rack-and-pinion type steering if the steering
iluid is not pressur-
ized because of a faulty PumP.
VALVE
INPUT SHAFT
INPUT SHAFT
VALVE XOUSING
o f
' I
lEng.ge with th€ Pinion
shaft groove)
TORSION BAR
Dift6rance in angle b6twe€n the
input ih.ft.nd
pinion shalt
l a
-l
B
VALVE BODY UN]T
SECNON B.B
17-8
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Troubleshooting
