Rollerblade Braking System

1
Rollerblade Braking System

• Design Team 11

2
Design Team 11

• Team Members
• Jeffery Aucoin
• Dima Eshtaya
• Sean Milley
• Jamie Zwicker
• Team Supervisor
• Dr. Robert Bauer

3
Introduction

• Existing Design

• Proposed Design

http//www.jacqdesign.com/img/blog/photos/Rollerbl
adeCrossfire4D.jpg
4
Existing Design

• Rubber Stop Pad

5
Existing Design

• Rubber Pad attached to the heel of one
  rollerblade
• To stop user must push the pad against the ground
  to create a braking force

http//www.skatescool.com/inline-skating/learn-how
-to-t-stop-on-inline-skates/
6
Areas of Improvement

• Balance and Stability
• Difficulty/Technique
• Pad Wear and Lifetime
• Stopping Distance

http//www.skatescool.com/inline-skating/learn-how
-to-t-stop-on-inline-skates/
7
Stability
Existing Design
Proposed Design
8
Testing

• Maximum speed 30km/h
• Average stopping distance from 20km/h 13m

Stopping Distances from 20km/h Stopping Distances from 20km/h Stopping Distances from 20km/h Stopping Distances from 20km/h Stopping Distances from 20km/h
  Jamie Dima Jeff Sean
Trial 1 13.20m 14.61m 14.51m 12.59m
Trial 2 13.11m 13.92m 13.62m 12.91m
Trial 3 12.54m 12.98m 13.49m 12.61m
Trial 4 12.21m 13.28m 12.48m 12.54m
Average 12.77m 13.70m 13.53m 12.66m
Average Group Stopping Distance Average Group Stopping Distance Average Group Stopping Distance Average Group Stopping Distance 13.16m
9
Design Requirements

• Requirements of Proposed Design

10
Design Requirements

• Removable
• Support a 225lb user
• Improved braking distance
• Maintain mobility/stability
• Controlled stop
• Increased lifetime
• Serviceable

11
Design Selection

• Foot Support
• Wheel Frame and Assembly
• Brake Actuator and Application
• Power Supply
• Control Unit

12
Foot Support

• Ability to attach over existing footwear
• Modify existing snowboard binding
• Add third strap
• Adjust mobility of back support

http//5150snowboarding.com/product/ff1500
13
Wheel Frame

• Housing for all components of the skate
• ? Square Channel Iron
• Dimensioned to incorporate range of shoe sizes

14
Braking Application

• Electric
• Drum
• Disk

15
Electric/Magnetic Brakes

• Good for high speed braking
• Provides energy feedback
• Brake force diminishes as speed decreases
• Cannot lock up

http//www.flightglobal.com/blogs/runway-girl/Gear
20shot201.JPG
16
Drum Brakes

• Least actuating force
• Complex setup
• Not easily serviceable
• Poor heat dissipation
• Prone to brake fade

http//auto.howstuffworks.com/auto-parts/brakes/br
ake-types/disc-brake1.htm
17
Disk Brakes

• High actuating forces
• High rate of heat dissipation
• Less susceptible to brake fade
• Easily serviceable
• Require little maintenance

http//mtobikes.com/wp-content/magura-louise-mount
ain-bike-disc-brake.jpg
18
Brake Torque Calculations






19
Disk Brake Calculations
20
Wheel Assembly

• All rotating pieces
• Axles
• Bearings
• Wheels
• Brake rotors

21
Brake Actuators

• Hydraulic Pump
• Solenoid / Piston Setup
• Electric Motor with Power Screw and Piston Setup

22
Hydraulic Pump

• Provides adequate pressure
• Too Large in size / weight
• High cost

http//www.mesltd.co.uk/images/ZSIM21118476.jpg
23
Solenoid / Piston Setup

• Provides adequate force
• Forces diminishes with displacement
• Large power requirement
• High current draw

http//www.fwmurphy.co.uk/images/RP23xx_solenoid_m
edres.jpg
24
Electric Motor with Power Screw and Piston

• High torque motor
• High forces generated
• High pressure output
• Low power consumption
• Low cost, weight and size

http//www.robotshop.ca/rbban07-banebots-planetary
-gearmotor.html
25
Power Screw Calculations

• Power Screw Specs

Output rpm Output Rev/s Torque Nm Torque inlb Thread Type
444 7.4 1.454 12.869 ¼-20 LH
http//www.roton.com/application_engineering.aspx

• Output Force

Force Lb Force N
412.9 1842
Required Actuating Force 78.5N
26
Power Supply

• Solar
• Alternator
• Battery

27
Power Supply

• Solar
• Alternator
• Battery Power

http//www.thesource.ca/estore/product.aspx?langua
geen- CAcatalogOnlinecategoryRCToyBatteries
product2300322
28
Remote Control

• Hydraulic Lines
• Wireless

29
Hydraulic Lines

• Simplest Control
• Connects users hands to feet
• Mobility compromised

http//media.rei.com/media/dd/84f36172-d484-4224-a
6cc-00a2fa3e0ec6.jpg
30
Wireless

• Additional Requirements
• Eliminates physical connection
• Mobility maintained

http//www.robotshop.ca/pololu-high-power-motor-co
ntroller-1.html
http//www.robotshop.ca/dfrobot-usb-microcontrolle
r-atmega168.html
http//www.robotshop.ca/sfe-xbee-explorer-regulate
d.html
31
Budget

• 1,330.74

32
Budget
1 Braking, 1 Non-braking 1 Braking, 1 Non-braking 1 Braking, 1 Non-braking 1 Braking, 1 Non-braking 1 Braking, 1 Non-braking 1 Braking, 1 Non-braking
  Description Qty Unit Price Total Price Totals
Roller Blade Prototype 1 100.00 100.00  
  Attachment screws and bolts 1 20.00 20.00  
  ratchet straps 6 9.99 59.94  
  strap buckle 6 12.99 77.94  
  axle rod 1 6.50 6.50  
square channel 1 20.00 20.00  
  plastic foot support 2 45.00 90.00  
8 x 90mm wheels with bearings 1 79.99 79.99  
Section Sub-Total         454.37
Braking Planetary gear and power screw motor 1 35.55 35.55  
  Rotor 2 10.00 20.00  
  Hydraulic brake caliper with lever controlled piston 1 150.00 150.00  
  Hydraulic brake caliper 1 80.00 80.00  
  Hydraulic fluid 1 20.00 20.00  
Section Sub-Total         305.55
Wireless Controller Transmitter 1 40.00 40.00  
  Receiver 1 40.00 40.00  
  Micro Controller 1 108.00 108.00  
  Motor Controller 1 50.00 50.00  
Section Sub-Total         238.00
Safety Equipment Helmet 1 29.99 29.99  
  Mouth guard 1 10.00 10.00  
Section Sub-Total         39.99
Power source battery pack and charger for actuator motor 1 23.99 23.99  
  16 AA batteries for wireless controller 1 20.00 20.00  
Section Sub-Total         43.99
Total Summary sub total       1,081.90
  13 tax       140.65
  10 miscellaneous       108.19
  final total       1,330.74
33
Conclusion

• Proposed Design

34
Final Design
35
Questions?

• The End