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Objective

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  • Figure out how a double wishbone suspension works

  • Find out what makes up a suspension

    • bell crank tab, shock mounting tab, toe-rod, etc.

  • Look into “multilevel” frame arc - see notes over suspension conversation from today.

  • Design considerations for frame to accommodate front suspension geometry

  • Look at the old susp design, and what we could change about that so the new sys is the best it could be.

  • What loads are gonna be at these hardpoints, and how do we create geometry (cross brace) to counteract?

By the end of 10/19/2024, have the following done:

  • Project goals

  • Background research

  • Notes from discussion with suspension

  • Any design criteria and other considerations

  • Any sources used

  • Any visuals used

Double Wishbone Suspension - How does it work?

To first understand DWS, it’s important to understand camber.

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These are cool because they allow each suspension to act independently - if there is a bump on the road that affected only the front right wheel, it’s suspension system is the only one that would react. (Race Car Design by Derek Seward - 3.1: Introduction to Racing Car Suspensions)

The Bell Crank

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Push Rod, Bell Crank, Shock

A push rod “pushes” so that the bell crank can transfer motion to the shock. (pull rods also exist)

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Important note: External vs Internal suspension system hardpoints are the EXACT same.

10/26/2024 Meeting W/Suspension

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Transcription so you can read:

Objectives:

  • Understand Bell Cranks

  • Hex vs Rect multilevel frame arc

  • Improve current front frame design

You don’t want a large mounting distance, one problem w/this is huge upright.

One problem w/Daybreak - pedal box

  • Ergo unhappy (small space)

  • Suspension unhappy (ctrl arms far apart)

  • Frame unhappy (prob bad load handling)

Overall, loss-loss-loss situation

Hexagon frame is better cuz smaller top control arm (facilitates negative camber for cornering)

Note: Recommendation for dY b/w ctrl arms is 9 in, sus currently tryna do 8 in.

Below are diagrams, ignore everything except for the bottom left hexagon. It’s a diagram of how suspension would look like on the front frame.

Taking a look at the Old Suspension and Frame Systems

Observations (suspension)

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