Student: Daymon Fritz

Mentor: Charles Pringle

Abstract:

The Central Washington University (CWU) Mechanical Engineering Technology (MET) program owns an electric vehicle called the “Cat-Mobile” designed to be entered into an Electrothon America race. The Cat-Mobile is a collaborative project, various aspects of which are built by CWU MET students in the capstone sequence of the senior year. For the Cat-Mobile to operate safely and effectively, it was necessary to design and build a proper front suspension system. The suspension needed to meet Electrothon America Handbook rules dictating a minimum ground clearance of 2” and optimize material usage to keep added weight at or below 20lbs. Loading and stress analysis was used to design the suspension system, and FEA analysis assisted with optimization. The final design modeled a typical “double-wishbone” or “double A-arm” style suspension. A spindle assembly was mounted between the A-arms with the use of ball-joints. The spindles included provisions for steering, and potential mounting locations for braking components. A coil-over style shock absorber is used which can allow for height and dampening adjustments. The total mass of parts added to the Cat-Mobile was just 12.7 lbs. The ground clearance of the Cat-Mobile can be adjusted and at minimum height adjustment, conforms to the Electrothon America requirement of 2”.

Presentation:

5 thoughts on “Electric Vehicle Front Suspension”

  1. Nice work Daymon,
    Your rebuild made a huge difference in the EV. I wish people on here could see the before and after for themselves. Very professionally executed, and high quality work.

    Kelson

  2. The EV is closer to be race ready because of your work on this project. I really enjoyed seeing the car get better. Crazy that you’re thinking about making the suspension better with it being as excellent as it is now. But that’s engineering (optimize, optimize, optimize!). Great project I can’t say enough.

    1. Thanks Jay! I found I could remove a lot of material from the control arms. and after I designed the upper control arm I had an idea of how to make it camber adjustable as well, but that could be for another senior to tackle perhaps

  3. This project was super cool to watch Daymon! It was easy to tell how much knowledge of cars you have, and the product you created made such a difference in performance! Cant wait to see what else you create!

    Devon

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