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WHEN OIL PUMP OPERATES AT HIGH SPEED
plunger is pushed further toward the right than for
medium speed, and both variable orifices close.
the bypass port opens wider. The fluid flowing to
OPERATION OF THE RELIEF VALVE
When the A chamber pressure increases when the
wheel is turned while the vehicle is
steering
stopped, the B chamber pressure also increases.
and, when the pressure exceeds the relief spring
set load of 8,000 kPa (1,138 psi), the relief valve pan
which is closed by a steel ball opens and the fluid
passes through the bypass port and is returned to
the pump's intake port.
To steering gear box
POWER STEERING - Oil Pump
the
orifice, with the result that the amount of discharge
flow is reduced to minimum, and, as a result, the
As a result of this action, the pressure of the B
chamber decreases, and the relief valve closes once
again. This action takes place in a moment, and in
this way, by maintaining the correct balance, the
maximum pressure is controlled.
Relief
Bypass pan
box then is supplied only from the fixed
effort becomes moderately "heavy", thus
excellent handling stability at high speed.
Fixed orifice
Steel ball
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