Mountain Bike Rear Mountain Bike Rear SuspensionSuspension

ME 493 Final Presentation – ME 493 Final Presentation – 20042004

Group Members:Group Members:Heather LandisHeather Landis

David HarrisDavid HarrisLuther BealeLuther Beale

Chris Polinsky Chris Polinsky

Academic Advisors:Academic Advisors: Dr. Chien WernDr. Chien Wern Dr. David TurcicDr. David Turcic

Mission StatementMission Statement

To design a new To design a new mountain bike rear mountain bike rear suspension system suspension system that responds to that responds to terrain inputs while terrain inputs while minimizing minimizing response to rider response to rider inputs better than inputs better than existing systems.existing systems.

TopicsTopics

Linkage SynthesisLinkage Synthesis ModelModel Simulations and AnalysisSimulations and Analysis Prototype and EvaluationsPrototype and Evaluations

ResearchResearch

Project Definition Project Definition Patents and SimulationsPatents and Simulations

Ideal Axle PathIdeal Axle Path

Working Model Working Model SimulationSimulation

Linkage Linkage Simulations of Simulations of Existing Existing DesignsDesigns

Ideal Axle Paths

-0.02

0.00

0.02

0.04

0.06

0.08

0.10

0.12

-0.025 -0.02 -0.015 -0.01 -0.005 0

Rearward Axle Movement (mm)

Ver

tica

l A

xle

Mo

vem

ent

(mm

)

100mm Bump

50mm Bump

Optimum Path

Linkage Synthesis and Linkage Synthesis and DesignDesign

Hoeken Four-Bar Hoeken Four-Bar LinkageLinkage

Goals and Goals and ConstraintsConstraints DrivetrainDrivetrain Wide Range of SizesWide Range of Sizes Reduced InteractionReduced Interaction

Solid ModelSolid Model

Solid Model ComponentsSolid Model Components

SimulationsSimulations

Working ModelWorking Model Constrained FrameConstrained Frame Full BikeFull Bike DroppingDropping

SimulationsSimulations

Constrained Constrained FrameFrame

SimulationsSimulations

Full BikeFull Bike

SimulationsSimulations

DroppingDropping

SimulationsSimulationsForce Analysis at the Pin Joints as the System Travels Over a 4 in curb at 40 MPH

-2000

-1500

-1000

-500

0

500

1000

1500

2000

0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45

Travel Time (s)

For

ce (

lbs

)

Force of Pin Joint 172 Fx

Force of Pin Joint 172 Fy

Force of Pin Joint 569 Fx

Force of Pin Joint 569 Fy

Force of Pin Joint 479 Fx

Force of Pin Joint 479 Fy

Force of Pin Joint 170 Fx

Force of Pin Joint 170 Fy

Force of Pin Joint 852 Fx

Force of Pin Joint 852 Fy

Force of Pin 174 Fx

Force of Pin 174 Fy

Force of Pin Joint 1176 Fx

Force of Pin Joint 1176 Fy

Finite Element Analysis Finite Element Analysis (FEA)(FEA)

Forces from Forces from Working ModelWorking Model Bottom BracketBottom Bracket

Finite Element Analysis Finite Element Analysis (FEA)(FEA)

Forces from Forces from Working ModelWorking Model ChainstayChainstay

Finite Element Analysis Finite Element Analysis (FEA)(FEA)

Forces from Forces from Working ModelWorking Model SeatstaySeatstay

ManufacturingManufacturing

ManufacturingManufacturing

AssemblyAssembly

AssemblyAssembly

Thank youThank you

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