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torsion bar
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Torsion-bar spring
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torsion bar

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History

torsion bar, rod or bar that resists twisting and has a strong tendency to return to its original position when twisted. In automobiles a torsion bar is a long spring-steel element with one end held rigidly to the frame and the other end twisted by a lever connected to the axle. It thus provides a spring action for the vehicle. See also spring.