sitsweaknessinsupportingside-to-sideorlateralmovement.Whencoilspringsareusedatthedrivewheels,heavytractionbarsortorquetubesareoftenrequiredtomaintainaxlehousingalignment.Anumberofvehiclesuseatorsionbarspring.Itisalong,solidsteelshaftthatisanchoredatoneendtothesuspensionscontrolarmandattheotherendtothevehicle'sframe.ursinthebarwhenoneendistwistedandtheotherendremainsfixed.Whenaverticalimpactonawheelistransmittedthroughthecontrolarmtothetorsionbar,thebartwiststoabsorbtheimpact.Thebar'snaturalresistancetotwistingquicklyrestoresittoitsoriginalposition,returningthewheeltotheroad.Atorsionbarcanstoreasignificantlyhighermaximumamountofenergythaneitheranequallystressedleaforcoilspring.Thetorsionoffersimportantweightsavingsanditisadjustable.Inaddition,itrequiressignificantlylessspacethanacoilspring.
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