When turning the steering wheel, the steering shaft, together
with the steering control valve spool rotation, as transmitted by
the steering knuckle arm of the road turning resistance, power
cylinder piston and the rack can not be a temporary movement,
it  turned  to  control  valve  and  steering  gear  before  they  can
rotate with the shaft. In this way, transmitted by the steering
shaft torque steering control valve gear steering control valve
can  only  produce  a  little  to  reverse  the  deformation  of  the
torsion bar, so that, together with the steering shaft steering
control  valve  control  valve  spool  to  shift  gears  produce  a
relatively small rotation, thereby steering control valve to the
side  of  power  cylinder  high-pressure  chamber  into  the  oil
chamber into the other side of the back cavity has become the
low-pressure  oil  chamber.  The  role  of  the  high-powered
hydraulic cylinder piston force to help force the steering gear
steering  control  valve  to  the  side  of  the  mobile  rack,  and
steering control valve and steering gear shaft itself began to
rotate in the same direction. Continue as long as the steering
wheel  rotation,  the  torsional  deformation  of  torsion  bar  has
been unchanged, the role of steering control valve is also the
same  help.  Once  the  steering  wheel  to  stop  turning,  power
cylinder  side  of  the  cavity  of  the  high  hydraulic  forces
temporarily continue to exist, led to a shift control valve gear
continues to rotate, so that reduces the deformation of torsion
bars, until the torsion bar to return to its natural state. Steering
control valve back to the middle position, left and right power
cylinder interlinked, so that hydraulic power does not work. At
this point, steering wheel that is docked in a position without
moving, then the wheels to maintain a certain corner. If rotating
steering wheel, hydraulic power also play a role.

Power cylinder piston suffered a hydraulic pressure into linear
force to help the rack and move around, through the steering
horizontal rod to promote the steering knuckle and the wheels
turning.

Control Valve In the Middle

Pressure

Return

Valve Axle

Straight Position

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Control Valve Turning Left

Pressure

Return

Left Turn Position

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Control Valve Turning Right

Pressure

Return

Right Turn Position

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Steering System

Hydraulic Power Steering System

7-7

7.2.3.2  Power  Steering  Pump  Assembly
Working Principle

Flow Control Orifice

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Power steering pump is a blade power steering pump and its
working  principle  is  as  shown  in  the  graphic.  The  engine
rotating torque is delivered through the drive belt to the power
steering  pump  belt  drive  assembly  and  rotates  the  power
steering  pump  assembly  drive  shaft  and  the  rotor.  Blades
installed on the rotor are thrown out due to the centrifugal force,
rotate close to the pump ring (rear pump housing) wall, draw
the steering fluid from the fluid reservoir to the pump chamber,
and press the fluid through the flow control valve to the steering
gear, provide power steering hydraulic assistance.

Flow control valve regulates the steering gear fluid flow based
on the system fluid pressure. adjust the system fluid pressure.
Prevent the system hydraulic pressure being too high.

7-8

Hydraulic Power Steering System

Steering System

7.2.4 Component Locator
7.2.4.1 Component Locator

4

6

1

3

2

5

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Legend

1. Power Steering Gear and Rack Assembly
2. Power Steering Pump Assembly
3. Power Steering Inlet/Outlet Pipe/Hose Assembly (to

Steering Gear, Power Steering Pump)

4. Power Steering Inlet/Outlet Pipe/Hose Assembly (to

Power Steering Pump, Reservoir)

5. Power Steering Pipe with Fluid Reservoir Assembly
6. Power Steering Inlet/Outlet Pipe/Hose Assembly (to

Steering Gear, Reservoir)

Steering System

Hydraulic Power Steering System

7-9

7.2.5 Disassemble View
7.2.5.1 Disassemble View

7

6

5

1

2

3

4

8

9

10

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Legend

1. Power Steering Gear and Rack Assembly
2. Steering Dust Cover
3. Washer
4. Steering Dust Cover Liner
5. Power Steering Inlet/Outlet Pipe Assembly
6. Power Steering Inlet/Outlet Pipe Assembly (Fluid Inlet)

7. Power Steering Pipe with Fluid Reservoir Assembly
8. Fluid Reservoir Bracket
9. Power Steering Inlet/Outlet Pipe Assembly (Fluid Outlet)
10. Power Steering Pump Assembly

7-10

Hydraulic Power Steering System

Steering System