Automobiles - Vehicle_Dynamics(12)

FHRegensburg,UniversityofAppliedSciencesProf.Dr.-Ing.G.Rill

steeringsystemisusedontruckswithlargewheelbasesandindependentwheelsuspensionatthefrontaxle.Herethesteeringboxcanbeplacedoutsideoftheaxlecenter.

TherotationsofthesteeringwheelδLare rstlytransformedbythesteeringboxtothero-tationofthesteerleversδG=δG(δL).Thedraglinkstransmitthisrotationtothewheelδ1=δ1(δG),δ2=δ2(δG).Hence,againtheoverallsteeringratiodependsontheratioofthesteerboxandonthekinematicsofthesteerlinkage.

1.3.4DragLinkSteeringSystem

Atsolidaxlesthedraglinksteeringsystemisused,

Fig.1.6.

Figure1.6:DragLinkSteeringSystem

TherotationsofthesteeringwheelδLaretransformedbythesteeringboxtotherotationofthesteerleverarmδH=δH(δL)andfurtherontotherotationoftheleftwheel,δ1=δ1(δH).Thedraglinktransmitstherotationoftheleftwheeltotherightwheel,δ2=δ2(δ1).Thesteeringratioisde nedbytheratioofthesteerboxandthekinematicsofthesteerlink.Heretheratioδ2=δ2(δ1)givenbythekinematicsofthedraglinkcanbechangedseparately.

1.3.5BusSteerSystem

Inbussesthedriversitsmorethan2minfrontofthefrontaxle.Here,sophisticatedsteersystemsareneeded,Fig.1.7.

TherotationsofthesteeringwheelδLaretransformedbythesteeringboxtotherotationofthesteerleverarmδH=δH(δL).Viathesteerlinktheleftleverarmismoved,δH=δH(δG).Thismotionistransferredbyacouplinglinktotherightleverarm.Viathedraglinkstheleftandrightwheelarerotated,δ1=δ1(δH)andδ2=δ2(δH).

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