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Objective

Design a Parking Brake for MSXV that satisfies ASC and WSC regulations

Due date

Key outcomes

Status

IN PROGRESS

Daily Objectives

  • January 23, 2022: Figure out caliper suspension
  • January 24, 2022: Come up with at least one design of caliper bracket and explain the advantages and disadvantages of each. Include sketches and screenshots of CAD models where applicable. 
  • January 25, 2022: Come up with at least one design of suspension mount for caliper bracket and upright
  • January 26, 2022: Finalize lever design

Problem Statement

Design MSXV’s Parking Brake, ensuring that it meets all regulations as imposed by ASC and WSC

🎯 Scope

Must have:

  • Rotors must have a diameter from 6.00” to 13.00”

  • Rotors must have a thickness from .25” to .81”

  • Actuating lever (to connect caliper to brake cables)

Nice to have:

  • Hang caliper on center, or very close to center of rotor(?)

  • Parking Brake Calipers should be mounted lower, (to keep center of gravity low, low c.o.g = smoother ride, reduced weight transfer)

  • Mounted at 10-11 o'clock position

  • Design caliper bracket mount

Keep in mind:

  • MSXII’s parking brake failed to meet FSGP requirements for minimum stopping distance

  • Parking cables have a minimum bending radius of 6”

Need to figure out:

  • Narrowness of car

  • How brakes (caliper portion) will be mounted

  • Do we want a stick vs center lever parking brake (center lever recommended)

  • How do brake caliper assemblies work

  • Lever force

  • What would a front suspension look like

  • Lever design

Questions for Chassis Lead (Mohamed)

  • Finalized chassis CAD file?

  • Size of occupancy cell?

  • Stick vs center lever? Possible to mount a lever in a position where it pushes out and forward from driver?

  • Two flaps on side of the driver seat, can mount there or in between the driver’s legs. If you choose to mount between the driver’s legs there will be a problem where the lever mechanism interferes with a box that will carry extra weight

Caliper Carrier (Keep in Mind)

  • Adjustable tabs

  • Caliper carrier connected to suspension mount (one part)

  • Hopefully suspension doesn’t interfere with caliper body (lol)

Given Parts

Parking Brake Parts

Part #

QTY

Catalogue URL

Specs

Wilwood Caliper (Parking Brake Caliper)

120-1360

2

https://www.wilwood.com/PDF/Flyers/fl13A.pdf

  • Single piston, floating caliper

  • Has a cam-actuated lever

  • Two settings for leverage adjustment

Dorman First Stop Brake Cable

C661356

1

https://www.partsource.ca/products/c661356-dorman-first-stop-brake-cable-part-c100000-c699999

Parking Brake Cable Kit

330-9371

1

https://www.wilwood.com/PDF/DataSheets/ds1108.pdf

  • Cable’s should be routed as straight as possible, minimum bend radius of 6”

\uD83D\uDD17 Reference materials

 ASC Regulations

  • 10.6 Parking Brake Solar cars must be equipped with a parking brake. 

  • 10.6.A Performance The parking brake shall be able to hold the car in place without wheel chocks on dry pavement under either a forward or rearward force equal to 10% of the cars weight in fully loaded condition. 

    The parking brake should be able to hold the car in place when pushed with a force equal to 10% of the cars weight (a.k.a if car’s weight is 100N, it should be able to withstand 10N of force)

  • 10.6.B Independence This brake must operate completely independently from the main braking system and may not be used in the performance tests specified in Reg.10.9.D. 

  • 10.6.C Locking 

    • 10.6.C.1 It must be able to be locked into the “ON” position, such that the driver does not have to continue to hold it to maintain position. 

    • 10.6.C.2 The driver shall be able to set and lock the parking brake while seated in the normal driving position and seat belted in. 

    • 10.6.C.3 The driver shall be able to set and lock the parking brake in a single action or motion. 

  • 10.6.D Contact Style

    The parking brake shall not be of a tire or wheel contact style (i.e. pad on tire or pad on rim styles are not considered as acceptable designs).


 WSC Regulations

  • 2.21.9

If the service braking system fails, the secondary braking system must be able stop the fully laden solar car within distance 0.1 v + 0.0158 v2 metres from any speed v, in km/h, that the solar car can achieve.

  • 2.21.10

Solar cars must be equipped with a parking brake that can be operated by the driver from the normal driving position. The parking brake must hold the fully laden solar car on a 20% incline or decline.

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