STEERING
B2420, WSM
7-M9
(2) Operation
Neutral Position
While the steering wheel is not moved, the torsion
bar (2) is not twisted. There is no gap between the input
shaft (1) and sleeve (3). This makes no pressure
difference between the chambers "a" and "b" of the
cylinder, which keeps the ball nut (4) and sector shaft (6)
in their positions.
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Left Turn
When the steering wheel is turned left, the initial
friction between the tires and the road surface keeps the
ball nut (4) and sector shaft (6) in their positions. The
torsion bar (2) alone is twisted to produce a gap between
the input shaft (1) and sleeve (3) and to activate the
valve. By so doing, the cylinder's chamber "a" comes
under high pressure and the ball nut (4) is moved to the
right. Finally the sector shaft (6) gets turned to turn the
machine to the left.
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Right Turn
The operating principle is the same as with the left
turn. For the right turn, however, the gap between the
input shaft (1) and sleeve (3) is in the direction opposite
to that of left turn. By so doing, the cylinder's chamber
"b" comes under high pressure and the ball nut (4) is
moved to the left. Finally the sector shaft (6) gets turned
to turn the machine to the right.
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Manual Operation in Case of Hydraulic System
Failure
Let's suppose that the hydraulic system gets
in trouble due to a defective pump, damaged pipe or
the like and that the steering resistance is too high to
use the power steering system. In such case, the
steering wheel can be in the manual mode. When the
steering wheel is turned, the torsion bar is twisted for the
valve's stroke and from now on the steering wheel
functions in the manual mode. It should be noted that the
steering wheel's play becomes larger than that in the
power steering mode.
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(1) Input Shaft
(2) Torsion Bar
(3) Sleeve
(4) Ball Nut
(5) Main Shaft
(6) Sector Shaft
(7) Gear Box
a: Chamber
b: Chamber
(1) Input Shaft
(2) Torsion Bar
(3) Sleeve
(4) Ball Nut
(5) Main Shaft
(6) Sector Shaft
(7) Gear Box
(1) Input Shaft
(2) Torsion Bar
(3) Sleeve
(4) Ball Nut
(5) Main Shaft
(6) Sector Shaft
(7) Gear Box
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