Torsion-Bar Springs
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This CAD illustration of the Hummer H2 front suspension shows the components of a typical torsion-bar suspension. To understand how a torsion spring works, imagine your chest is the crossmember, your left arm is the torsion bar, and your hand is stuck in the lower A-arm. When the suspension compresses, the torsion bar (or your arm) is twisted clockwise by the lower A-arm. But because the torsion bar is anchored at the other end in the crossmember (just as your arm is anchored in your shoulder) the torsion bar will exert a counterclockwise force to push the A-arm down and hold the truck up. View Related Article
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