SSS 7 – Automotive Chassis & Suspension Design

19 July 2016 Nguyen K. Ta Suspension Engineer TJM Products

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AGENDA 1.  My background 2.  Chassis 3.  Suspension 4.  Chassis and Suspension Integration 5.  Testing of chassis and suspension 6.  Q&A

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AboutMe

•  Educa0on:–  Cer0ficateIIinAutomo0veVehicleServicing

–  BachelorinAutomo0veEngineeringwithHonours

•  Work:–  Automo0veMechanic

•  PeterDaveyToyota•  Caltex

–  Automo0veEngineer•  MonroeAustralia•  TJMProducts

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Chassis

•  OverallL/W/H(mm)•  Wheelbase/Fronttrack/RearTrack

•  Tareweight/Payload

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ChassisPerformanceTargets

•  Weight•  Torsionals0ffness•  Crashsafety

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DriverErgonomics

•  Comfort•  Opera0onofcontrols•  Driveregress

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PackagingConstraints

•  Ensureyougetthebestcompromisewiththema0ngcomponents

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Suspension

•  Purposeofsuspension–  Ride–  Handling–  Loca0on

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Suspension

•  Suspensionsystemtypes•  Independent

–  Doublewishbone–  McPhersonStrut–  Trailingarmmul0link

•  Dependent–  Torsionbeamrear–  Rearliveaxle–5link

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Suspension

•  Suspensionsystemtypes•  Independent

–  Doublewishbone–  McPhersonStrut–  Trailingarmmul0link

•  Dependent–  Torsionbeamrear–  Rearliveaxle–5link

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Suspension

•  Suspensionsystemtypes•  Independent

–  Doublewishbone–  McPhersonStrut–  Trailingarmmul0link

•  Dependent–  Torsionbeamrear–  Rearliveaxle–5link

h]ps://www.auto123.tv/en/car-pictures/mazda/cx-5/2013/

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Suspension

•  Suspensionsystemtypes•  Independent

–  Doublewishbone–  McPhersonStrut–  Trailingarmmul0link

•  Dependent–  Torsionbeamrear–  Rearliveaxle–5link

PATENTUS7946600B2

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Suspension

•  Suspensionsystemtypes•  Independent

–  Doublewishbone–  McPhersonStrut–  Trailingarmmul0link

•  Dependent–  Torsionbeamrear–  Rearliveaxle–5link

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Suspension

•  Suspensionsystemtypes•  Independent

–  Doublewishbone–  McPhersonStrut–  Trailingarmmul0link

•  Dependent–  Torsionbeamrear–  Rearliveaxle–5link

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Suspension

•  Suspensionsystemtypes•  Independent

–  Doublewishbone–  McPhersonStrut–  Trailingarmmul0link

•  Dependent–  Torsionbeamrear–  Rearliveaxle–5link

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SuspensionPerformanceRequirements

•  Providever0calcompliance•  Suspensiontravel•  Mo0onra0o•  Bumpsteer•  Cambergain•  Adjustabilityrequired•  Minimisetyreload

fluctua0on•  Ensurevehicleresponds

favourablytocontrolforcesproducedbythetyres

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RollCentre

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CamberGain

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Chassisandsuspensionintegra0on

•  Itera0onandop0miza0onofperformancetargets

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•  Mountyoursuspensiontopointsonyourchassiswiththeleastdeflec0on.

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•  Sphericalsinthesystem?Makesuretheyoperatearoundnominal

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Compromise

Chassis

•  Driverergonomics•  Packagingwithothercomponents

•  Torsionals0ffness•  Weight

Suspension

•  Track•  Wheelbase•  Suspensiontravel•  Cambergain•  Bumpsteer•  Adjustability

TUGOFWAR

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Compromise

Chassis

•  Driverergonomics•  Packagingwithothercomponents

•  Torsionals0ffness•  Weight

Suspension

•  Track•  Wheelbase•  Suspensiontravel•  Cambergain•  Bumpsteer•  Adjustability

TUGOFWAR

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Compromise

Chassis

•  Driverergonomics•  Packagingwithothercomponents

•  Torsionals0ffness•  Weight

Suspension

•  Track•  Wheelbase•  Suspensiontravel•  Cambergain•  Bumpsteer•  Adjustability

TUGOFWAR

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ParametricModelling

CADModel

LINK

Kinema0cAnalysisModel

POINT X Y Z

RH-UBJ -5 550 350

RH-LBJ 0 550 50

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Kinema0candComplianceRig

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Q&A