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Ownership

Form Factor DRI

Contributors

Project DRI

kaizen liu

Geoffrey Liu Vrut Maheshkumar Patel (Deactivated)

Suhail Jaffer (Deactivated)

Latch+Handles

Research

 Latch + Handles

Most likely designing our own custom latch+handle assembly

Some videos on latches

  1. https://www.youtube.com/watch?v=v3iUZ-UmbOQ

  2. https://www.youtube.com/watch?v=U4CWCrjODPE

  3. https://www.youtube.com/watch?v=bGk6xT80VgM

Rotary Latch

Cars typically use two-stage latch, as it provides safety to “false” latching, meaning that it prevents the event of accidentally opening or not completely closing a door.

The double rotor provides more tolerance to misalignment and can withstand greater loading than the single rotor.

Handle

Functional Requirements:

  • Allow the opening of the door

  • Flushed with the surface for aero efficiency

Non-functional requirements:

  • Aesthetically pleasing

  • Easy to access and use

  • Easy to manufacture

  • Good durability

Constraints:

  • Dimensions already defined

Some handle ideas (exterior)

Some Videos on Exterior Handle Mechanism

  1. https://www.youtube.com/watch?v=9LBbjwAmvBc&list=WL&index=14&t=376s

  2. https://www.youtube.com/watch?v=rGkd_hB-nKQ&list=WL&index=12

Concept Design:

  1. Handle Design

2. Handle Cover

Spring Mechanism:

Latch Assembly/ Handles From previous researches

Sketching

CAD Concepting

File links or locations

Screenshots

Door Panel

Research

Functional Requirements:

  • Allow for easy access to and operation of the interior handle / latch

  • Should not touch seats or other components of the car

  • Should not interfere with opening/closing of door

  • Lightweight: should not be too heavy for hinges to handle

Non-functional requirements:

  • Aesthetically pleasing

  • Easy to manufacture

  • Should not cause injury if bumped against (want rounded edges, soft material)

How To (general idea)

There’s a surprising amount of youtube video of people diy-ing their own door panels

https://www.youtube.com/watch?v=qr9CGT3BQGo

https://www.hotrodders.com/forum/door-panel-tutorial-145092.html → nice written tutorial w pics

https://www.youtube.com/playlist?list=PLDUPNrOKk-RF5x4L6ft7bPJao3loGOYf4 → a whole playlist!

  • this guy uses ABS, so will need to figure out how PVC foam board is worked

Materials

  • PVC foamboard and ABS plastic sheets seem to be the most common materials

PVC Foamboard

ABS

Cheaper

More expensive

Lighter

Heavier

… consensus seems to be PVC

Easier to work with

Overheats very quickly (melts), needs higher temp to shape

https://www.hotrodders.com/forum/interior-door-panel-material-393769.html

https://www.hotrodders.com/forum/abs-vs-pvc-66825.html

List of benefits of PVC foamboard

  1. is completely waterproof.

  2. is easily cut, shaped, drilled, and sanded with regular wood working tools, and there are no splinters.

  3. is easily stapled, accepts contact adhesive with no problems, can be heat formed, sewed, and glued together.

  4. will never warp, rot, or absorb liquids.

  5. is completely smooth, and tough enough to allow you to install and remove your panels numerous times with no problems.

  6. is lightweight (1/2 the weight of solid PVC and 2/3 the weight of ABS)

  7. is less expensive than solid PVC and ABS. One $30 sheet of PVC foamboard should do your door panels and kick panels, which also makes it less expensive than waterproof panel board and about the same price as good quality luan plywood.

Things to look out for

  • Excess heat can warp the plastic: as in leaving the car out in the sun can cause issues.

    • The package tray (horizontal surface right under the window) is especially prone to overheating: might be best to use plywood on those surfaces

Procurement/Cost

Manufacture

  • PVC can be glued together

  • It can also be sewed together with a regular sewing machine

More links

https://www.hotrodders.com/forum/door-panels-230613.html

https://www.hotrodders.com/forum/door-panels-230613.html

https://www.hotrodders.com/forum/interior-door-panel-material-110094.html

https://www.hotrodders.com/forum/interior-door-panel-material-393769.html

Sketching/Play-doh concepting

  • Green outline represents housing panel (1 pc): placed over latch/cable system, other features we want to hide edges of panel → panel made of pvc foam board

    • Slightly raised so that components we want to hide can fit under it

    • Mounting points around panel edges can be raised (on the side facing the door) → use layers of foam board strips to build up raised edge lip

    • Need ways to attach panel temporarily: Screws? Velcro? Clips?

  • Pink: interior handle to control latch system

  • Yellow: armest + grab feature (one piece) → top of arm rest: how to make comfy? fabric?

  • Mesh storage (bottom right)

  • armrest + grab handle feature

    • yellow outlines = mounting “tabs” (where adhesive will applied to attach armrest feature to the door) → will be covered by panel

CAD Concepting

  • Outlined sections act as “housing” to cover latch system, handle system, and to make the panel less flat/1-dimensional

    • They will be hollow/raised to have a gap between them and the door itself to allow components to fit underneath it

  • The outlined sections will all be removable (ie attached with velcro) to allow access to the covered components

  • The armrest/grab handle feature (not outlined) will be permanently attached to the door as securely as possible to allow for weight to be leaned on it without breaking

Next Steps:

  • CAD passenger door

  • Add some molding/sculpting onto green panel to make it less flat and more visually interesting

  • Add mesh storage feature and figure out how it will be attached while still allowing door panel to be removed

  • Figure out materials, aesthetics, colours, etc

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