Chery A15 / 480 LHD model. Manual — part 139

1. Torsion Bar

2. Input Shaft

3. Valve Bush

WORKING PRINCIPLE

Middle Position

·When the vehicle moves straight (the steering wheel does not turn), the hydraulic oil

which is supplied by the oil pump enters the oil inlet through the pre-opened
clearance of the rotary valve. As the rotary valve keeps immovable, the hydraulic oil
flows back to the oil reservoir from the return oil inlet. No power is produced
because the oil pressures of the two chambers of the steering gear are same.

Steering Process

·When the steering wheel turns, the clearance of the valve spool between the valve

bush and the input shaft will be changed, so the hydraulic oil which flows to the two
oil chambers forms the oil pressure difference. This difference acts on the piston and
pushes it to overcome the steering resistance and make movements. Therefore, the
steering link assy is moved to realize power steering.

Return Process

·Once the steering is completed, the force on the steering wheel will disappear. As the

effect of the torsion bar elasticity, the input shaft returns to the relative balance
position of the valve bush and the oil pressure difference between the two oil
chambers of the steering gear follows to disappear. And then the vehicle will convert
to straight-line motion by the effect of the vehicle self aligning torque of the front
wheels until it enters the straight-line position.

Road Sense Effect

·The road sense effect is also called the ability of feeling steering. The driver applies

the force on the steering wheel, which also act on the torsion bar of the steering gear
and makes it deform. The amount of deformation which increases as the steering
resistance grows, depends on the wheel steering resistance. Therefore, the driver can
judge the variation of the steering resistance by the force applied on the steering
wheel to obtain the road sense effect.

To Left Chamber

Oil Inlet

To

Right Chamber

Return oil inlet

Figure 2

INTRODUCTION OF PERFORMANCE

※The steering force of the steering wheel can be decreased. Power can be felt obviously,

especially when the vehicle turns on spot or turns with great corner at low-speed.

※The steering sensitivity is enhanced.

※The impact of kickback from ground on the steering wheel is reduced.

※In the case of tire burst, the sudden turning of the wheels can be effectively avoided. So the

security of driving can be improved.

※The load on the steering wheel is permitted to increase, which can improve the freedom

motion of the general arrangement.

The power steering gear of the steering system of A15LHD is a standard feature, and the
mechanical steering gear is optional.

In fact, the power steering gear of A15LHD is based on the mechanical rack & pinion
steering gear and enhanced with a set of power mechanism which is composed of the engine
used as energy sources, the steering oil pump, the steering control valve, the power oil
cylinder and other components. Under the working condition, the power of the engine drives
the steering oil pump through the ribbed belt. The power steering fluid (ATF oil) is suck out
from the oil reservoir by the steering oil pump and formed pressure oil to get into the control
valve. After distributed by the control valve, the pressure oil enters the power cylinder to
push the working piston which is connected with one end of the steering rack. So the steering
power can be formed by the pressure oil through the working piston.

If the power steering system is in failure, the steering of the vehicle can be also completed by
the driver.

The optional mechanical steering gear is a rack & pinion steering gear which the power
source is the physical force (strength of the hand) of the driver. All the dynamic components
are mechanical.

REMOVAL/INSTALLATION OF STEERING COLUMN

Removal and Installation of the Steering
Column

·Remove the nuts on the steering wheel

·Remove the upper and lower protector of the

instrument cluster and the switch

·Remove the instrument panel assy. (Please refer

to the removal of the instrument panel)

·Remove the joint bolt of the upper steering

column bracket and the car body upper bracket.

·Grind away the safety screw and replace with a

new one when installing.

·Remove the joint bolt between the steering gear

and the steering column (tightening torque:
30N·m)

·Install the steering column inversely according

to the removal steps.

The inner spline of the steering gear is

shown as the picture below:

Removal and Installation of Steering Shaft and Steering Tube

·Remove the clip.

·Take off the serrated set bush and the steering gear lock housing from the steering column

·Draw out the steering shaft and press the lower bearing of the steering column out with a

presser.

·Disassemble the lock housing spring of the bracket ring steering shaft with a presser.

·Assemble the steering column inversely according to the removal steps.

Precaution：

·Apply a little grease around the lower bearing and the inner wall of the steering hose

column lower end, press the lower bearing into the steering hose column using a
presser.(Do not move the upper and lower universal joint of the guard column)

·Adjust the relative height of the lock housing and the hose column according to the height

of the pre-installed ignition lock cylinder and the combined switch cover.

·Apply lithium base grease evenly around the contact ring.

Disassembling Illustration of the Steering Column

REMOVAL/INSTALLATION AND CHECK OF STEERING GEAR

Lift the whole vehicle at a designated safe
place with a lifter

·Remove the high and low pressure oil tube
of the steering gear with torques of 45±3N·m
and 30±3N·m respectively.

·Remove the joint piece of the steering link

·Remove the shift shaft bracket

·Remove the front tube and the three way
catalytic converter with torques of 60±3N·m

Two bolts on one side of the steering gear are
shown as the picture below. Tightening
torque: 30±3N·m.

20

1- Horn Button Cap； 2-Nut（40N·m）

； 3- Spring Washer; 4-Steering Wheel；

5- Serrated Set Bush; 6-Spring； 7-Lower Trim Cover 8- Upper Trim Cover

9- Steering Gear Lock Housing and Steering Column Switch； 10- Support ring；

11-Steering Shaft； 12-Nut（30N·m）

； 13- Steering Universal Joint

14- Hex Bolt 15-Spring； 16- Steering Column Lower Bearing

17-Safty Screw； 18-Washer； 19-Steering Tube； 20- Clip