Anti-roll bar

The stabilizer is a spring element in the automobile, which contributes to improving the roadholding. It connects opposed wheels through a short lever, and a torsion bar spring.


The spring action is obtained by the rotation (torsion) of torsion bars often circular.

The central part of the stabilizer is supported on the body, the angled ends, which act as levers, by means of rubber elements in the wheel suspension, for example, wishbones mounted.

In principle, the method is similar to the mechanics of the space bar of the computer keyboard. Regardless of where it is pressed, it lowers equilateral.

When lifting of a wheel ( compression), the opposite wheel is also raised above the twisting of the stabilizer lowered during lowering as well. This will counteract the body roll when cornering. With the simultaneous compression of both wheels, the stabilizer does not occur in action. Sided compression when driving straight ahead ( by uneven road surfaces ) leads to movement of the vehicle about its longitudinal axis.

Hardness adjustable stabilizers are used in racing to optimize the self-steering behavior of the vehicle, of the line. A firmer setting only of a stabilizer results in a displacement of the grip to the other axle. Oversteer can be corrected by, for example, a harder setting on the front axle or a softer setting on the rear axle. Furthermore, hardness adjustable stabilizers are now incorporated into production cars, such as, BMW of the so-called ARS ( Active Roll Stabilizer ) in the special features " Dynamic Drive ".

A stabilizer in an alternate configuration with opposite function is the so-called balance spring, running

  • As a torsion bar on the rear axle ( VW Beetle )
  • As a spring coil on the rear hinge ( Mercedes- Benz W110 ) or
  • As gas-hydraulic unit on the rear joint with level compensation (Mercedes- Benz W108 ).

Balance springs do not work against the body roll when cornering, but hinder the equilateral rebounding ( Aufstützeffekt ), thus stabilizing the dangerous driving behavior of vehicles with swing axle. They are found only there.

In general, one seeks for comfort reasons a relatively soft wheel suspension on, however, for reasons of safety and also the loadability a relatively hard ( and ideally height corrected ) axle suspension.

  • Chassis Technology