4.1.1. Axis geometry шкворня
In a forward suspension bracket with a rack, wheels rotate round an axis шкворня, going from a point where the shock-absorber is attached to a body (A point) and to the spherical hinge (B point).
In a forward suspension bracket with double cross-section levers (with floating hinges), wheels rotate round an axis шкворня, going from the spherical hinge of the top lever (a point of C) to an imaginary axis of turn (a point of D), proceeding from the bottom lever (ов). Axis crossing шкворня and road surfaces (E point) - is displaced in the car from the wheel center on the road (W point) that gives shift шкворня. In comparison with a forward suspension bracket with a rack, the forward suspension bracket with two cross-section levers (with floating hinges of the lever) has the technical advantages described below.
The inertia moment concerning an axis шкворня decreases at the expense of small shift шкворня from the wheel center. This feature reduces probability of emergence of withdrawal and intensive vibrations of a steering during the braking, violation of smooth work of a steering on the bad road and influences on the moment of resistance of operated wheels of the car of roughness of a paving.
The shift size шкворня (negative shift шкворня) is optimized. Thereof, influence of weight of an axis is not felt, and management is facilitated. Stability Besides, improves at rectilinear movement as the moment of a convergence of wheels from effort of braking counteracts the moment caused by roughnesses of the road and/or a difference of efforts of braking of the right and left wheels.
|Fig. 4.3. The comparative scheme of suspension brackets – with a rack and cross-section levers: 1–axis шкворня; 2–inclination шкворня; 3–shift шкворня; 4–shift шкворня concerning the wheel center; 5–wheel center; 6–imaginary point of turn; 7–a forward suspension bracket with two cross-section levers of high fastening; 8–a forward suspension bracket with a rack (626); 9–front view; 10-top view; 11-forward part