Iveco daily euro 4, Repair Manual

Page: 675 / 1132

The king-pin camber angle (
β
) is the angle formed by the axis
passing through the king-pin and the vertical to the ground,
looking at the vehicle from the front.
When the projection of the king-pin axis is near to the contact
point of the wheel with the ground (opposite tendency to the
wheel camber) the angle is positive, it is difficult to say that it
is impossible to have the king-pin camber angle negative.
The wheel camber angle (
α
) and the king-pin camber angle (
β
)
enable wheel axis and the king-pin axis to come nearer as much
as possible to the contact centre of the tyre on the ground.
In this way, reduced tyre wear and lower steering torque are
obtained.
In order to have a good vehicle ground holding, a low
consumption of tyre and to enable the driving wheels to return
to straight running after steering, the front wheels are adjusted
at defined assembly angles:
-
wheel camber angle;
-
king-pin camber angle;
- caster angle;
-
wheel toe-in.
These angles, accurately calculated, enable the correct balancing
of the forces created when the vehicle is moving, in the different
load conditions, tending to change the position of the wheels
on the ground.
Figure 1
Caster angle
Wheel camber angle
The camber angle (
α
) is the angle formed by the axis passing
through the wheel centre line and the vertical to the ground,
looking at the vehicle from the front.
The camber angle is positive (A) when the upper part of the
wheel tends toward the outside; it is negative (B) when the
wheel upper part tend toward the inside.
32956
32957
32958
Figure 2
Figure 3
A B
a a
ß
The caster angle (
γ
) is the angle formed by the king-pin axis with
the vertical to the ground, looking at the vehicle from one side.
If the projection formed by the king-pin axis falls in front of the
wheel contact point with the ground, in the direction of travel
of the vehicle, the caster angle is by convention positive (A); it
is negative (B) if it falls behind the wheel contact point with the
ground; it is equal to zero if it is perfectly vertical to the contact
point.
A B
+
_
γ γ
Camber angle
WHEEL GEOMETRY
51
D
AILY
E
URO
4
Print 603.93.651 Base - March 2006
Print 603.93.281
DESCRIPTION