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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

    • Timelines

    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: Mr. TranTommy, 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 *

    Conceptual Latch Designs:

    • Simple key and cam lock - keyhole integrated into the trunk back wall, receiver on the closed trunk lid lip above it, hook-based twist lock, cylindrical key

    • Buckle lock (think a seatbelt) - release integrated into the back wall, buckle attached to the lid lip, simple button release (like a seatbelt), automatic lock

    • Toggle latch - latch attached to the back wall, receiver attached to the lid lip, simple toggle latch

    • Slide Bolt - receiver attached to the back wall, bolt attached to the lid lip, spring-based stopping mechanism, simple push release, automatic lock

    sketches to follow *

    h

    Automatic?

    Receiver Idea

    Input Idea

    Stability

    Machinable In-House

    Receiver Integration Method

    Input Integration Method

    Key

    No

    Image Removed

    Image RemovedImage Removed

    First

    Probably, depending on design

    Adhered to the inside of the lid lip

    Inserted into the back wall

    Buckle

    Yes

    Image Removed

    Image Removed

    Second

    Probably, depending on design

    Inserted into the back wall

    Adhered to the inside of the lid lip

    Toggle

    No

    Image Removed

    Image Removed

    Fourth

    Not completely

    Adhered to the outside of the back wall

    Adhered to the outside of the lid lip

    Slide

    Yes

    Image not found, similar concept to the buckle receiver

    Image Removed

    I couldn’t find a correct image, so just imagine it permanently stationary

    Third

    Probably, depending on design

    Adhered to the outside of the back wall

    Adhered to the outside of the lid lip

    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.