Automobiles - Vehicle_Dynamics(14)
时间：2025-07-08
FHRegensburg,UniversityofAppliedSciencesProf.Dr.-Ing.G.Rill
Theunitvectorsinthedirectionsofcircumferentialandlateralforcesexandeyaswellasthetracknormalenfollowfromthecontactgeometry.
1.4.2ToeandCamberAngle
1.4.2.1De nitionsaccordingtoDIN70000
Theanglebetweenthevehiclecenterplaneinlongitudinaldirectionandtheintersectionlineofthetirecenterplanewiththetrackplaneisnamedtoeangle.Itispositive,ifthefrontpartofthewheelisorientedtowardsthevehiclecenterplane,
Fig.1.9.
front
F
F
rear
Figure1.9:PositiveToeAngle
Thecamberangleistheanglebetweenthewheelcenterplaneandthetracknormal.Itispositive,iftheupperpartofthewheelisinclinedoutwards,Fig.1.10.
topF
F
bottom
Figure1.10:PositiveCamberAngle
1.4.2.2Calculation
Thecalculationofthetoeangleisdonefortheleftwheel.TheunitvectoreyRindirectionofthewheelrotationaxisisdescribedinthevehicle xedcoordinatesystemF,Fig.1.11
eyR,F=
(1)eyR,F(2)eyR,F(3)eyR,F
T
,(1.1)
wheretheaxisxFandzFspanthevehiclecenterplane.ThexF-axispointsforwardandthezF-axispointsupward.Thetoeangleδcanthenbecalculatedfrom
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