Automobiles - Vehicle_Dynamics(15)

VehicleDynamicsFHRegensburg,UniversityofAppliedSciences

Figure1.11:ToeAngle

tanδ=

eyR,F

(2)

eyR,F

(1)

.(1.2)

Therealcamberangleγfollowsfromthescalarproductbetweentheunitvectorsinthedirec-tionofthewheelrotationaxiseyRandinthedirectionofthetracknormalen,

sinγ= eTneyR.

Thewheelcamberanglecanbecalculatedby

(1.3)

sinγ= eyR,F.

Ona athorizontalroadbothde nitionsareequal.

(3)

(1.4)

1.4.3SteeringGeometry

1.4.3.1Kingpin

AtthesteeredfrontaxletheMcPherson-damperstrutaxis,thedoublewishboneaxisand

multi-linkwheelsuspensionordissolveddoublewishboneaxisarefrequentlyemployedinpassengercars,Fig.1.12andFig.1.13.

Thewheelbodyrotatesaroundthekingpinatsteeringmovements.

Atthedoublewishboneaxis,theballjointsAandB,whichdeterminethekingpin,are xedtothewheelbody.

TheballjointpointAisalso xedtothewheelbodyattheclassicMcPhersonwheelsuspen-sion,butthepointBis xedtothevehiclebody.

Atamulti-linkaxle,thekingpinisnolongerde nedbyreallinkpoints.Here,aswellaswiththeMcPhersonwheelsuspension,thekingpinchangesitspositionagainstthewheelbodyatwheeltravelandsteermotions.

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