J
3-20
DRIVE-CONTROL
COMPONENTS
-
Power Steering
BEFORE SHOCK
Steering bushing
Bellows
/
Upper column
Lower column
Al
3X0223
AFTER SHOCK
Al
3X0222
OIL
PUMP
The oil pump is an engine speed sensitive type
which changes its delivery rate so that the steering
wheel turning effort will always be optimized.
OIL PUMP PERFORMANCE
<Non-turbo>
dm3/min
10
e
g
8
a
E
z?
6
9
‘-
8
4
E
12
2
0
10
20 30 40 50 60
70
Pump speed (N) (Xl
OOr/min.)
L’
**I’
“1
I
0
1
23456789
Pump pressure (P)
MPa
Al
3X0220
@
When a shock load is applied to the steering
wheel, the upper column slides forward. At the
same time, the bellows of the steering shaft
L)
are deformed. During this process, the shock
load is absorbed by the friction between the
lower column and the inside surface of the steer-
ing bushing attached to the upper column.
<Turbo>
Pump speed (N)
(XlOOr/min.)
t
11
11
I I I I
(
0123456789
Ls
Pump pressure (P)
MPa
A13X0219
NOTE
(1) P-Qf characteristic: Pump pressure and pump delivery rate.
(2) N-Qf characteristic: Pump speed and pump delivery rate.
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