Twist-beam rear suspension
suspension
The twist-beam rear suspension (also torsion-beam axle, deformable torsion beam, or compound crank) is a type of automobile suspension based on a large H- or C-shaped member. The front of the H attaches to the body via rubber bushings, and the rear of the H carries each stub-axle assembly, on each side of the car. The cross beam of the H holds the two trailing arms together, and provides the roll stiffness of the suspension, by twisting as the two trailing arms move vertically, relative to each other.
Functioning
The coil springs usually bear on a pad alongside the stub-axle. Often, the shock is collinear with the spring forming a coil-over. In many cases, the damper is also used as a restraint strap to stop the arm descending so far that the coil spring falls out through being completely unloaded. This location gives a high motion ratio compared with most suspensions, improving performance.
The longitudinal location of the cross beam controls important parameters of the suspension's behavior, such as the roll steer curve and toe and camber compliance. The closer the cross beam to the axle stubs, the more the camber and toe change under deflection. A key difference between the camber and toe changes of a twist beam versus a traditional independent suspension is the change in camber and toe is dependent on the position of the other wheel, not the car's chassis.
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This entry incorporates text from “Twist-beam rear suspension” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.