4-033
HYDRAULIC SYSTEMS
Steering speed and flow control:
In the steering mechanism, the flow to the steering cylinder
must be increased or decreased according to the rotational
speed of the steering wheel.
Orbitrol controls the flow by changing the displacement angle
between spool (1) and sleeve (2). In other words, sleeve (2)
follows the rotation of spool (1) during the steering wheel
operation, closing the hydraulic circuit.
When rotational speed of the steering wheel increases,
the delay of sleeve (2) (displacement angle) increases,
increasing the flow.
Hydraulic pump flow and operating force:
When the hydraulic pump discharge is sufficient, the steering
operating force is used simply to overcome the sliding
resistance of sleeve (2) and the rotor, permitting the steering
wheel to rotate easily.
When the hydraulic pump discharge is insufficient, the
displacement angle between spool (1) and sleeve (2)
reaches the maximum, reducing the quantity of oil flowing
from the hydraulic pump into the rotor even if the hydraulic
circuit opens widely, causing the rotor to rotate slowly.
As a result, the spool rotation becomes faster than the rotor
rotation to increase the displacement angel to a maximum
extent, and the spool rotates the rotor via the cross pin and
drive shaft. At that time, the rotor functions as a hydraulic
pump, preventing the steering wheel from rotating smoothly.
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SV414-04012
1. Spool
2. Sleeve
6. Centering spring
2
6
1
2
6
1
Large
displacement
angle
Small
displacement
angle
Slow steering speed
Fast steering speed
Содержание SV414
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