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Transcript of Fall Presentation
Team 4 Baja Chassis
Blair Douglas
Brandon Hawes
Robert Paterson
Ryan Robertson
Supervisor: Dr. Ugursal
What is Baja SAE
Requirements
Considered Designs
Frame
Front Suspension
Rear Suspension
Steering
Budget
Project Status
Sponsors 2
Baja SAE Midwest
3
Hosted by
Rochester Institute
of Technology
June 6-9, 2013
100 Teams from
around the world
What is Baja SAE
2004 Dalhousie Baja1
What is Baja SAE
Requirements
Considered Designs
Frame
Front Suspension
Rear Suspension
Steering
Budget
Project Status
Sponsors 4
Design Requirements
1. Safety: Meet all safety standards
2. Reliability: Perform an off-road test before leaving
for competition.
3. Maximum Width and Length: 64 in (W) x108 in (L)
4. Must fit a person of height 75 in and 250 lb.
5. Maximum Chassis Weight: 400 lb.
6. Minimum Suspension Travel: 6 in.
7. Maximum Turning Radius: 11.5 ft.
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Requirements
What is Baja SAE
Requirements
Considered Designs
Frame
Front Suspension
Rear Suspension
Steering
Budget
Project Status
Sponsors 6
Frame
Compact
Simple
Strong
Meet all Baja SAE Regulations regarding
frame and roll cage design
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Considered Designs
Suspension
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MacPherson Strut
Double A-Arm
3-Link
Twin I-Beam
A-Arm with Trailing
Arm
MacPherson with
Trailing Arm
Considered Designs
MacPherson Strut2
Steering
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4-Bar Linkage / Pitman Arm style
Needs space
Worst case reliability
Rack & Pinion
Considered Designs
10
Technical Terms
Positive3 Camber Negative4
Castor5
What is Baja SAE
Requirements
Considered Designs
Frame
Front Suspension
Rear Suspension
Steering
Budget
Project Status
Sponsors 11
Main Features
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Frame
AISI 1020 Pipe
Roll cage
Front section
Rear section
Meets SAE
regulations
Determining Roll Cage
Dimensions
13
Frame
Stress Analysis
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Frame
What is Baja SAE
Requirements
Considered Designs
Frame
Front Suspension
Rear Suspension
Steering
Budget
Project Status
Sponsors 15
Double A-arms
Unequal length arms
Ground clearance of
11” at ride height
10” of wheel travel
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Front Suspension
A-Arm Geometry
17
Front Suspension
15”
4”
8”
Range of Motion
18
Front Suspension
Static Ride Height
Camber Angle = 0º
Full Bump
Camber Angle = -13º
Full Droop
Camber Angle = +5º
Stress Analysis
19
Front Suspension
What is Baja SAE
Requirements
Considered Designs
Frame
Front Suspension
Rear Suspension
Steering
Budget
Project Status
Sponsors 20
3-Link
Trailing Arm
Rear Links
Maximized Space
Maximized Travel
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Rear Suspension
Driver
Area
Drivetrain
Space
Maximum Travel
Limited by:
CV Joints
Shock Geometry
Rod Ends
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Rear Suspension
Total Wheel Travel 12”
Installation Ratio 0.45
Coilover
Dual Rate
Rear
Initial rate: 200 lbf/in
Final rate: 600 lbf/in
Front
Initial: 100 lbf/in
Final: 300 lbf/in
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Rear Suspension
Shock Absorber
Slider
What is Baja SAE
Requirements
Considered Designs
Frame
Front Suspension
Rear Suspension
Steering
Budget
Project Status
Sponsors 24
Rack and Pinion
Compact
Reliable
We have two 25
Steering
Castor & Layback
Less work to go straight
Reduced stress over
bumps
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Steering
Toe Correction
Location Matters
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Steering
Turning Radius – 11.5 ft
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Steering
-90
-60
-30
0
30
60
90
-2.5 -1.5 -0.5 0.5 1.5 2.5
Ste
er
An
gle
Steering Rack Translation (in)
Steering Angle Geometry
3.0 x 0 3.0 x 0.5 3.5 x 0
3.5 x 1.0 4.0 x 0 Required Outside Angle
Required Inside Angle
𝛿𝑖 = 𝐿
𝑅 −𝐵2
= 40°, 𝛿𝑜 = 27° Ackermann
Analysis
L=76.5 in
R = 138 in
B = 50 in
What is Baja SAE
Requirements
Considered Designs
Frame
Front Suspension
Rear Suspension
Steering
Budget
Project Status
Sponsors 29
Preliminary
Budget
30
Budget Parts List Description Cost
Frame
1020 Steel Tube, 1" OD 0.120" wall Frame Tubing 310$
1018 0.25" x 8" Steel Plate Frame Plating 100$
48" x 48" x 0.032" 6061 Aluminum Firewall & Plating 380$
Subtotal 790$
Suspension
1020 Steel Tube, 1" OD 0.120" wall A-arm & Link Material 70$
4" x 5" 6061 Aluminum Block Upright Material 390$
A-arm Bushing Kit Bushings 50$
1/2"-20, 1/2" ID Steel Rod End Ball Joint 3-Link Joints 60$
3/4"-16, 3/4" ID Steel Rod End Ball Joint Trailing Arm Joints 30$
FOX Float R 18.2" x 5.3" Rear Shocks 600$
FOX Float R 15.6" x 4.3" Front Shocks 600$
2" OD Bearing Bearing 40$
Std. ATV Ball Joint Ball Joints 100$
1" OD 1018 Steel Rod Threaded Insert 30$
Subtotal 1,970$
Steering
3/8"-24, 3/8" ID Steel Rod End Ball Joint Tie Rod End 10$
1" OD, 0.25" wall 6061 Aluminum Tube Steering Column 40$
1" OD 1018 Steel Tube Tie Rods 20$
Subtotal 70$
Hardware
2-1/2" Fully Threaded Grade 5 Bolt Bolts 20$
1/4"-20 Nylon-Insert Grade 8 Nut Nuts 10$
7/16" ID 18-8 Stainless Washers Washers 20$
No.8- 1/2" Zinc Plated Self Tapping Screw Screws 10$
Subtotal 60$
General Baja Parts
K282 Viper Tire Tires 240$
T-9 Pro Baja Wheels Wheels 280$
Subtotal 520$
Overall Subtotal 3,410$
Contingency 580$
Taxes 510$
Total 4,500$
Polaris Parts
Halifax Motorsports Parts
CME Ltd. Materials
Mariner Forge Materials
Shamrock Ranching $ 500
Shell $ 500
Hawkes Blueberries $ 500
Scotia Insulations $ 250
Dalhousie $1800
Total $3550
Income
$ 4,500
What is Baja SAE
Requirements
Considered Designs
Frame
Front Suspension
Rear Suspension
Steering
Budget
Project Status
Sponsors 31
The Next Step
Build frame over break
Order components
Finalize engineering drawings
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Project Status
What is Baja SAE
Requirements
Considered Designs
Frame
Front Suspension
Rear Suspension
Steering
Budget
Project Status
Sponsors 33
Gold Sponsors
34
Sponsors
Gold Sponsors
35
Sponsors
Gold Sponsors
36
Sponsors
Silver Sponsors
CVTech
37
Sponsors
Bronze Sponsors
Committed Sponsors
Polaris
Halifax Motorsports
Canadian Maritime Engineering
Mariner Forge
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Sponsors
Questions
1 2004 DAL Baja, Team 14. http://poisson.me.dal.ca/~dp_04_14/ 2 MacPherson Strut, Auto Repair. http://autorepair.about.com/ 3 1927 Bugatti Type 37 Sport, Axis of Oversteer. axisofoversteer.com
4 Hammer Sport Wheelchair, Colours Wheelchair. colourswheelchairs.com 5 King Bike, kingbike.com
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