3022508 - 4450A wheel geometry
DESCRIPTION
The wheel geometry is understood as the
sum of the values and characteristic values of the suspension, which
are applied at the point of the tyre touching the ground.Point on the ground of the tyre
VIEW OF POINT ON THE GROUND OF TYREThe point on the ground of the tyre is the
centre of the area in contact between the tyre and ground.The values and angles which determine the
point on the ground are as stated below.Car geometry
Which defines the difference in height (B-A)/(D-C)
between the point A/C) (constant value) and point B/D (value varies depending
on load).Front car geometryRear car geometryCamber
Examples of camberA - Zero camber angle
B - Positive camber angle
C - Negative camber angleIndicates the inclination of the wheels,
determined by the angle formed between the axis passing through
the halfway point of the tyre and the line perpendicular to the
ground, which depending on this angle may be zero, positive or negative.The camber angle on this car cannot be adjusted.Wheel toe-in
Example of toe-inA - Positive toe-in
B - Negative toe-inDefines the angle formed by the horizontal
axis of the wheels in relation to the longitudinal axis of the car,
seen in plan view. When the horizontal axis tends to cross over
in the direction of travel, the toe-in is said to be positive; when
the crossover point is in the opposite direction, the toe-in is
called negative or toe-out. The front wheels of the car have a negative
toe-in, adjustable by adjust the power steering tie-rods, while
the rear wheels have positive toe-in, adjustable by adjusting the attachment
of the rear track control arm to the crossmember Characteristic
of working principle 4420B rear suspension wishbones.The toe-in value is normally expressed in
millimetres, and indicates the difference between the distances
measured on the horizontal halfway point on the wheel rims, in front
of and behind the hub (distance C and D in the figure). | The toe-in is the only value which
can be adjusted. |
To determine the tyre's point on
the ground, in addition to what has been described, the following
values are also involved:
- king pin angle;
- transversal ground arm;
- caster angle;
- longitudinal ground arm.
The camber angle and the above-mentioned
values cannot be adjusted. For a description of these characteristics
Characteristic
of working principle 4410 FRONT SUSPENSION.
