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An anti-roll bar (roll bar, anti-sway bar, sway bar, stabilizer bar) is an automobile suspension part that helps reduce the body roll of a vehicle during fast cornering or over road irregularities. It links opposite front or rear wheels to a torsion spring using short lever arms for anchors.
Mounted with the vehicle suspension stabilizer bars, each reduction mechanism houses a wave generator, flexible gear, and circular gear. [4] The system is activated when the vehicle enters a high-speed turn, and the sensors register vertical, longitudinal, and transverse forces which contribute to body lean and additional movements.
An active suspension is a type of automotive suspension that uses an onboard control system to control the vertical movement of the vehicle's wheels and axles relative to the chassis or vehicle frame, rather than the conventional passive suspension that relies solely on large springs to maintain static support and dampen the vertical wheel movements caused by the road surface.
A stiffer anti-roll bar generates a bigger slip angle on the outside tyre. So the end of the car with the stiffer anti-roll bar is likely to have the bigger slip angle. If the front has the bigger slip angle then the car tends to understeer (that big slip angle means the tyre doesn't grip and it slides straight ahead).
Not very easy to adjust for reduced roll stiffness, but increasing it is easily done by adding an anti-roll bar; Welds see a lot of fatigue, may need a lot of development; Not much recession compliance: can be poor for impact harshness, and will cause unwelcome toe changes (steer effects)
What all this means, though, is the current-generation 4Runner's optional KDSS system of hydraulically defeatable front and rear anti-roll bars is a goner. Coming This Fall
Anti-roll bars are suspension components designed to mitigate body roll. They do this by connecting the wheels at either end of an axle with a torsion bar attached to the vehicle body. Body roll can also be reduced by lowering centre of mass of the vehicle body, fitting stiffer suspension springs and reducing the sprung mass of the vehicle.
The assembly can be further simplified, if needed, by substituting an anti-roll bar (torsion bar) for the radius arm. [14] For those reasons, it has become almost ubiquitous with low cost manufacturers. Furthermore, it offers an easy method to set suspension geometry. [15] Many modern versions replace the lower control arm with a wishbone.