Chery A21 2005, Service Manual, Page: 126 / 475

CHERY A520 SERVICE MANUAL CHASSIS
45
2. Check the front wheel steering angle
After replacing tie rod joints or regulate
toe-in, you should check the steering angle.
If the front wheel steering angle doesn't
comply with relevant standards, you should
check and regulate the length of left and
right tie rods.
3. Kingpin caster angle
Kingpin caster angle is determined in design
structure; therefore, it need not be regulated.
Influence of caster angle
The main functions of caster angle are to
keep the car driving towards the right ahead.
If the caster angle is of positive value, in the
case of front wheel steering, the inner side of
the car shall descend and the chassis shall
ascend, which shall add loads to the steering
knuckle. If the caster angles of front wheel
and rear wheel are the same, the car shall
return to the right ahead position after
steering. The increasing of positive caster
angle shall improve the stability of steering
wheel, but the force shall become stronger in
the case of steering; while the decreasing of
positive caster angle shall lower down the
stability of steering wheel, but the force shall
become weaker in the case of steering. The
degree of caster angle shall not impose
influence on the tire wearing, which is used
to stabilize the driving direction of car and
make
the car return to alignment
automatically in the case of steering. If the
car is quipped with traditional mechanical
steering device, the degree of caster angle is
very small and even inclines to negative
caster angle, which can make it easy for
steering. If the car is furnished with dynamic
steering device, the caster angle is often
designed as bigger positive angle, which can
make the driver sensitive to steering. The
increasing of positive caster angle shall
Maximum rotating angle of
outer wheel
33
0
Maximum rotating angle of
inner wheel
41
0
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