Rollerblade braking system
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Transcript Rollerblade braking system
Design Team #11
1
Design Team #11
Team Members
Jeffery Aucoin
Dima Eshtaya
Sean Milley
Jamie Zwicker
Team Supervisor
Dr. Robert Bauer
2
Introduction
Existing Design
Proposed Design
http://www.jacqdesign.com/img/blog/photos/RollerbladeCrossfire4D.jpg
3
Rubber Stop Pad
4
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/
5
Areas of Improvement
Balance and Stability
Difficulty/Technique
Pad Wear and Lifetime
Stopping Distance
http://www.skatescool.com/inline-skating/learn-how-to-t-stopon-inline-skates/
6
Stability
Existing Design
Proposed Design
7
Testing
Maximum speed:
30km/h
Average stopping
distance from 20km/h:
13m
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
13.16m
8
Requirements of Proposed Design
9
Design Requirements
1.
2.
3.
4.
5.
6.
7.
Removable
Support a 225lb user
Improved braking distance
Maintain mobility/stability
Controlled stop
Increased lifetime
Serviceable
10
Foot Support
Wheel Frame and Assembly
Brake Actuator and Application
Power Supply
Control Unit
11
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
12
Wheel Frame
Housing for all
components of the skate
⅛” Square Channel Iron
Dimensioned to
incorporate range of
shoe sizes
13
Electric
Drum
Disk
14
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%20shot%201.JPG
15
Drum Brakes
Least actuating force
Complex setup
Not easily serviceable
Poor heat dissipation
Prone to brake fade
http://auto.howstuffworks.com/auto-parts/brakes/brake-types/discbrake1.htm
16
Disk Brakes
High actuating forces
High rate of heat
dissipation
Less susceptible to brake
fade
Easily serviceable
http://mtobikes.com/wp-content/magura-louise-mountain-bike-disc-brake.jpg
Require little maintenance
17
Brake Torque Calculations
18
Disk Brake Calculations
19
Wheel Assembly
All rotating pieces
Axles
Bearings
Wheels
Brake rotors
20
Hydraulic Pump
Solenoid / Piston Setup
Electric Motor with Power Screw and Piston Setup
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Hydraulic Pump
Provides adequate
pressure
Too Large in size /
weight
High cost
http://www.mesltd.co.uk/images/ZSIM21118476.jpg
22
Solenoid / Piston Setup
Provides adequate force
Forces diminishes with
displacement
Large power requirement
http://www.fwmurphy.co.uk/images/RP23xx_solenoid_medres.jpg
High current draw
23
Electric Motor with Power
Screw and Piston
High torque motor
High forces generated
High pressure output
Low power
consumption
http://www.robotshop.ca/rbban07-banebotsplanetary-gearmotor.html
Low cost, weight and
size
24
Power Screw Calculations
Power Screw Specs
Output Output Torque Torque Thread
rpm
Rev/s
N*m
in*lb
Type
444
7.4
1.454 12.869
¼-20
LH
http://www.roton.com/application_engineering.aspx
Output Force
Force
Lb
412.9
Force
N
1842
Required Actuating Force = 78.5N
25
Solar
Alternator
Battery
26
Power Supply
Solar
Alternator
Battery Power
http://www.thesource.ca/estore/product.aspx?language=enCA&catalog=Online&category=RC+Toy+Batteries& product=2300322
27
Hydraulic Lines
Wireless
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Hydraulic Lines
Simplest Control
Connects user’s hands to
feet
Mobility compromised
http://media.rei.com/media/dd/84f36172-d484-4224-a6cc-00a2fa3e0ec6.jpg
29
Wireless
Additional
Requirements
Eliminates physical
connection
http://www.robotshop.ca/polo
lu-high-power-motorcontroller-1.html
http://www.robotshop.ca/dfrobot
-usb-microcontrolleratmega168.html
http://www.robotshop.ca/sfe-xbeeexplorer-regulated.html
Mobility maintained
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$1,330.74
31
Budget
Roller Blade
Section Sub-Total
Braking
1 Braking, 1 Non-braking
Description
Prototype
Attachment screws and bolts
ratchet straps
strap buckle
axle rod
square channel
plastic foot support
8 x 90mm wheels with bearings
Section Sub-Total
Power source
Section Sub-Total
Total Summary
1
1
6
6
1
1
2
1
$100.00
$20.00
$9.99
$12.99
$6.50
$20.00
$45.00
$79.99
$100.00
$20.00
$59.94
$77.94
$6.50
$20.00
$90.00
$79.99
$454.37
Planetary gear and power screw motor
Rotor
Hydraulic brake caliper with lever controlled piston
Hydraulic brake caliper
Hydraulic fluid
Section Sub-Total
Wireless Controller Transmitter
Section Sub-Total
Safety Equipment
Qty Unit Price Total Price Totals
1
2
1
1
1
$35.55
$10.00
$150.00
$80.00
$20.00
$35.55
$20.00
$150.00
$80.00
$20.00
$305.55
Receiver
Micro Controller
Motor Controller
1
1
1
1
$40.00
$40.00
$108.00
$50.00
Helmet
Mouth guard
1
1
$29.99
$10.00
$40.00
$40.00
$108.00
$50.00
$238.00
$29.99
$10.00
$39.99
battery pack and charger for actuator motor
16 AA batteries for wireless controller
sub total
13% tax
10% miscellaneous
final total
1
1
$23.99
$20.00
$23.99
$20.00
$43.99
$1,081.90
$140.65
$108.19
$1,330.74
32
Proposed Design
33
Final Design
34
The End
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