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Table of Contents

2021.06.07 - Initial Brainstorming Meeting with Tommy

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Meeting Agenda:

...

Strategies

  1. How to be a good mech member :^)

  2. Engineering Design Process

...

Mechanical Design Stages

...

titleNotes, Plans, and Tips for new MS DRIs

Strategies:

  • Mech member = designer

    • they’re in charge of research and decision making

    • mech leads help with providing advice, intuition, and strategies for solving complicated problems

      • also useful for giving shortcuts, resources, or tips in finding those solutions

  • Do good research and documentation; keep it organized!

    • this is useful for presentation, communication, review, and for other people to give you suggestions

  • Engineering Design Process!!!

Mechanical Design Stages

  • Problem Definition

    • Stakeholders

      • People who are involved with your project or interested in your project

        • Other people in the car assembly

        • Mentors / reviewers

    • Design Requirements

      • Nonfunctional

      • Functional

      • Criteria

      • Constraints

        • **should note loading conditions that you expect and justify them

    • Engineering Design Specification

  • Conceptual Design

    • Concept Ideation

      • Morphological Design Table

    • Concept Evaluation

      • Numerical Evaluation Matrix

  • Detailed Design (Mechanical)

  • Design for Manufacturing and Assembly (DFMA)

  • Prototyping (Small Scale or Scaled Down)

    • try to make it cost-effective

Timelines

  • We will install the trunk latch in Spring 2022 at the latest.

  • Concept Design = 1 month

  • Detailed Design = 1.5 month

  • DFMA = 0.5 month

  • Installation = 1 week (whenever it will be installed)

Resources

Problem: Designing and integrating a trunk latch.

Stakeholders: Tommy, and Aerobody and Trunk teams.

Design Requirements [Qualitative]: lightweight, smaller (but still easily accessible & usable), sturdy, creates a seal, little to no intrusive integration required for implementation, and doesn’t open without human interaction.

Latch Types Considered: deadbolt, key, hook, buckle, toggle, and slide bolt.

Internal Lock Types Considered: cam lock and rotary. (not all Latch Types require an Internal Lock)

Specifics to Consider: the constant force of trunk spring (unknown) and consistent strain of car use (i.e. bumpy roads jostling the latch; unknown).

Pros and Cons of Latch Types:

Pros

Cons

Deadbolt

Easy to use, sturdy

Heavier, larger, intrusive integration, harder to implement, not totally trustworthy without stopping mechanism, harder to manufacture

Key

Lighter, sturdy, smaller, trustworthy

Intrusive integration, harder to implement, harder to manufacture

Hook

Lighter, smaller, non-intrusive, easy to use, easy to manufacture, easy to implement

Not sturdy, not trustworthy, no seal (unless well made)

Buckle

Easiest to use (hands off), sturdy, easy to manufacture, easy to implement

Larger, heavier, intrusive integration

Toggle

Smaller, lighter, non-intrusive, easy to implement

Not sturdy, harder to manufacture

Slide Bolt

Easy to use, lighter, smaller, easy to implement, non-intrusive

Not sturdy or trustworthy without stopping mechanism, harder to manufacture

some traits were neither pro nor con since they would depend on the design and manufacturing quality *

DECISION WAS REACHED TO PURCHASE A LATCH INSTEAD OF MANUFACTURING IT

After some research, it was found that most trunk latches available for purchase are only replacements for the receiver end, and wouldn’t include an input. The decision was reached that an “alternative version” of a traditional latch would need to be used, hence the latch types research above. The next steps are now to pick three models, email the supplier for their CAD (or guesstimate it myself if they don’t respond or have it to begin with). Then choose one, purchase it, and figure out how to integrate it into the car.

Chosen Models:

  1. https://www.seatbeltsplus.com/product/1256-60.html

  2. https://www.amazon.com/MY-MIRONEY-Concealed-Latches-Stainless/dp/B08QV6L9K9/ref=sr_1_5?dchild=1&keywords=buckle+latch&qid=1626025161&sr=8-5

  3. https://www.amazon.com/Sliding-Degree-Moving-Buckle-Privacy/dp/B07Q6HWH17/ref=pd_sbs_12/137-1895137-9815769?pd_rd_w=2xhyT&pf_rd_p=43345e03-9e2a-47c0-9b70-a50aa5ecbd5c&pf_rd_r=QD04B0N9JNSYMQCB37H4&pd_rd_r=feee5c33-f470-4c24-ac9f-ff14a72f8773&pd_rd_wg=Zekgh&pd_rd_i=B07Q6HWH17&psc=1

  4. https://www.amazon.com/Degree-Right-Angle-Sliding-Safety/dp/B08PYTFHR5/ref=pd_sbs_8/137-1895137-9815769?pd_rd_w=2xhyT&pf_rd_p=43345e03-9e2a-47c0-9b70-a50aa5ecbd5c&pf_rd_r=QD04B0N9JNSYMQCB37H4&pd_rd_r=feee5c33-f470-4c24-ac9f-ff14a72f8773&pd_rd_wg=Zekgh&pd_rd_i=B08PYTFHR5&psc=1

My top choice would be #3.