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Steering Pump
Construc'tion
The pump is a vane-type incorporating a flow control valve (with an integrated relief valve) and is driven by a POLY-V-belt
from the crank pulley. The pump features 10 vanes. Each vane performs two intake/discharge operations for every rota-
tion of the rotor. This means that the hydraulic fluid pressure pulse becomes extremely small during discharge.
Operation
The belt-driven pulley rotates the rotor through the drive shaft. As the rotor rotates. the hydraulic pressure is applied to
the vane chamber of the rotor and the vanes will rotate while being pushed onto the inner circumference of the cam ring.
The inner circumference of the cam ring has an extended portion with respect to the center of the shaft, so the rollers
move downward in the axial direction as the carrier rotates. As a result of this roller movement, the internal volume of the
vane chamber will change. resulting in fluid intake and discharge.
START OF FLUID INTAK€:
FLUID INTAKE:
FLUIO MOVEMENT:
FLUID DISCHARGE:
DISCHARGE PORT
T h e v a n e s a r e p u s h e d o n l o
the inner circumference of the
cam ring.
The volume of the vane cham-
ber increases so that fluid is
sucked in.
T h e s u c k e d i n f l u i d m o v e s
toward the discharge port.
A s t h e v a n e s r e t u r n t o t h e
t h e i r o r i g i n a l p o s i t i o n o n t h e
i n n e r s i d e , t h e v o l u m e o f t h e
v a n e c h a m b e r d e c r e a s e s s o
t h e f l u i d i s d i s c h a r g e d f r o m
t h e d i s c h a r g e p o r t -
I
(cont'd)
OUTLET PORT
17-5
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Troubleshooting
