The front wheels, in order to ensure the reliable behavior of the machine, must be located at a certain angle in the lateral and longitudinal direction. To give you some idea of the concept «steering geometry», here is an explanation of the concepts:
Track width: In the Audi A4, the front wheels are slightly more flattened than the rear wheels at rest. At the same time, they say that the track width «positive» Or does the car have «wheel alignment». The friction between the wheel and the road pushes the left wheel to the left and the right wheel to the right. This is offset to some extent by front-wheel drive forces that tend to bring the front wheels closer together. When turning the car, the toe-in of the front wheels goes into «discrepancy». This is done due to the trapezoidal arrangement of the steering rods: the inner wheel in relation to the turn turns more strongly than the outer one. This is also necessary, since the inner wheels describe a smaller circle than the outer wheels when cornering.
Camber: this is the name of a slight inclination of the front wheels to the outside - at the top in the wheel arch of the Audi A4 there is a smaller distance between them than at the bottom near the ground. In the language of professionals, this is called «negative» collapse.
Lateral lean: it has to do with camber. Lateral tilt is the slight tilt of the axle around which the wheels and suspension turn when the machine is steered. Both transverse axes have a smaller distance at the top than at the bottom.
Longitudinal inclination: This refers to the inclined position of the steering axles in the longitudinal direction of the vehicle. It also helps to stabilize the straight-line motion and prevents the front wheels from oscillating.
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