Automobiles - Vehicle_Dynamics(17)

VehicleDynamicsFHRegensburg,UniversityofAppliedSciences

Figure1.14:KingpinandCasterAngle

kingpin,describedinthevehicle xedcoordinatesystem

tanν=

with

eS,F

(3)eS,F

(1)

andtanσ=

T

eS,F

(3)eS,F

(2)

(1.5)

eS,F=

(1)eS,F(2)eS,F(3)eS,F

.(1.6)

1.4.3.3DisturbingForceLever,CasterandKingpinOffset

Thedistancedbetweenthewheelcenterandthekingpinaxisiscalleddisturbingforcelever.Itisanimportantquantityinevaluatingtheoverallsteerbehavior.

Ingeneral,thepointSwherethekingpinrunsthroughthetrackplanedoesnotcoincide

withthecontactpointP,Fig.1.15.

Figure1.15:CasterandKingpinOffset

Ifthekingpinpenetratesthetrackplanebeforethecontactpoint,thekinematickingpinoffsetispositive,nK>0.

Thecasteroffsetispositive,rS>0,ifthecontactpointPliesoutwardsofS.

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