12.4.3. The angles of installation of wheels of the car - the general information
The angles of installation of wheels considerably influence stability of the car, wear of tires and fuel consumption. Nominal rates of corners are specified in Specifications.
Disorder is called the wheel plane tilt angle 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 a paving and allows to compensate the changes in suspension bracket geometry happening during commission of turns and at the movement of the car on an uneven paving.
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 due to prevention 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.
Vybegom is called a corner of a longitudinal inclination шкворня / axes of turn of a wheel, i.e., a corner of a deviation of this axis from a vertical in the rim plane. If the axis the turn/pivot axle is inclined back, выбег is called positive, on the contrary.
By analogy, a cross corner an inclination of an axis of turn of a wheel call a corner of the deviation imagined шкворня from a vertical in the plane, perpendicular DP of the car.
Divergence of the operated wheels in turn is called the difference between angles of rotation of internal and external wheels when the first is turned under the set corner.
Conditions of check of angles of installation of wheels
Check of angles of installation of the car demands existence specially equipped the platform/elevator. Before check it is necessary to make sure of performance of the following conditions:
- Air pressure in tires corresponds to nominal;
- Forward wheels are established rectilinearly;
- The car is not loaded, the fuel tank is completely filled;
- Osazhena car suspension bracket elements with effort;
- The steering drive correctly is adjusted;
- Side plays in tips of steering drafts and spherical support of a suspension bracket do not go beyond admissible limits;
- Depth of a protector of the tires installed on wheels of one axis is identical.