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12:31. Angles of installation of wheels

Disorder of wheels

And — the Cylinder will slide on a straight line
In — the Cone will slide on a circle with the center from the narrow end
With — the Scheme of contact of wheels with a paving

D — Positive disorder
Е — the Vertical plane


General information

The angles of installation of wheels define geometry of situation of the last concerning a suspension bracket of the car and a paving. Violation of adjustment of this geometry leads to decrease in controllability of the car and increase in speed of wear of tires. The angles of installation of forward wheels of the car which are subject to control are among disorder, выбег (a corner of a longitudinal inclination of an axis of turn of a wheel) and convergence (see below).

Adjustment of geometry of a suspension bracket demands use of the special expensive and bulky equipment and its performance should be charged to specialists of car service.

Convergence

Convergence is called data size to each other of forward edges of wheels of the car. Such violation of parallelism of installation of wheels allows to minimize wear of a protector at the expense of a skid at commission of turns. At zero convergence the distance between forward edges of wheels is equal to distance between their rear edges. Normal convergence usually does not exceed inch shares (1 inch = 2.54 cm). Violation of adjustment of convergence leads to acceleration of wear of protectors of tires due to slipping them on a paving.

 


Disorder

Disorder is called the tilt angle of the plane of wheels concerning a vertical. If wheels are inclined by the upper edges outside, disorder is called positive and vice versa. The size of disorder is measured in degrees. Correctness of adjustment of disorder determines the size and the provision of a spot of contact of protectors with the road and allows to compensate changes in suspension bracket geometry during commission of turns and at the movement of the car on an uneven paving. Small negative disorder allows to increase a spot of contact of a protector during commission of turns, however, being excessive, leads to violation of course stability of the car and strengthening of the breakthroughs transferred to a steering wheel.

Выбег

Vybegom is called a corner of a longitudinal inclination of an axis of turn of a wheel, i.e., a deviation corner from a vertical of an axis of turn of a wheel in the plane of the last. If the axis of turn is inclined back, выбег is called positive, on the contrary. Positive выбег provides self-return of forward wheels to rectilinear situation at an exit from turn, increasing thereby course stability of the vehicle, however, being excessive, reduces maneuverability of the car.

 Lowering of a back of the car leads to increase in a positive vybeg of wheels.