Automobiles - Vehicle_Dynamics(11)

VehicleDynamicsFHRegensburg,UniversityofAppliedSciences

Inordertoachieveagoodmaneuverabilityamaximumsteerangleofapprox.30 mustbeprovidedatthefrontwheelsofpassengercars.Dependingonthewheelbasebussesandtrucksneedmaximumsteeranglesupto55 atthefrontwheels.

Recentlysomecompanieshavestartedinvestigationson’steerbywire’techniques.

1.3.2RackandPinionSteering

Rackandpinionisthemostcommonsteeringsystemonpassengercars,Fig.

1.4.Therackmaybelocatedeitherinfrontoforbehindtheaxle.TherotationsofthesteeringwheelδLare

Figure1.4:RackandPinionSteering

rstlytransformedbythesteeringboxtotheracktraveluZ=uZ(δL)andthenviathedraglinkstransmittedtothewheelrotationsδ1=δ1(uZ),δ2=δ2(uZ).Hencetheoverallsteeringratiodependsontheratioofthesteerboxandonthekinematicsofthesteerlinkage.

1.3.3LeverArmSteeringSystem

UsingaleverarmsteeringsystemFig.1.5,largesteeranglesatthewheelsarepossible.This

Figure1.5:LeverArmSteeringSystem

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