Post on 11-Dec-2021
SAE MINI BAJA® POWERTRAINSenior Design Team 3
Michelle Blunt
Thomas Brinson
Brian Coldwell
Ned English
3 April 2003
SENIOR DESIGN INTRODUCTION
• Two-semester course integrating 4-yr curriculum• Design and implementation of a customer product• Resemble real-world design conditions of industry• Demonstrate mastery of both traditional and non-
technical engineering skills
POWERTRAIN SCOPE
•Design and build the powertrain for an off-road vehicle that will survive the severe punishment of rough terrain and must propel itself through water
•Integrate system with other major systems of the vehicle, i.e. the chassis/suspension and braking
•Customers: FAMU-FSU SAE Club, President Pat Middleton Faculty Advisor Dr. Patrick Hollis SAE Mini Baja 2003 Competition Rules
•Presentable and acceptable final product
SPECIFICATIONS• Max vehicle dimensions: 60” x 96”
• Max rider size: 250 lbs, 6’ 3”
• Velocity and Acceleration: 45 mph within 100 ft
• Weight ratings: GVWR: 700 lbs; GCWR: 7000 lbs
• Briggs & Stratton 10Hp engine; Comet-OEM Differential kit
• Tire diameters: 22”
• Cover and protect all dynamic components (chains, belts, etc.)
• Vehicle manufacturing cost $3000/unit at a rate of 4000 units per year.
• Integrate with all other vehicle subsystems (suspension, chassis, etc.).
BACKGROUND INFORMATION
Open Differential Kit
10 Hp Briggs & Stratton Engine
High-Neutral-Reverse-Low Gearbox
CVT / Torque Converter
CONCEPT GENERATION
CONCEPT SELECTION
• Decision matrix to determine most ideal configuration
• Compromise performance and economics
• Iterative revisions: donated CVT and gearboxcalculation revisionscustomer requestsswing arm and frame modificationsprocket and chain adjustments
POWERTRAIN CONFIGURATION
POWERTRAIN COST ANALYSIS
$500Sprockets, etc.Miscellaneous
$50FabricatedSwing Arm
$910Club ExpenseTotal
$130Comet-OEMDifferential
$100RecycledCVT & Gearbox
$130Briggs & Stratton
10 Hp EngineEngine
REQUEST FOR SPONSORSHIP
• Spring Proposal
• Solicit material and financial donations
Kartworld.com
Gokartsupply.com
ORDERING
POWERTRAIN ASSEMBLY
VEHICLE DESIGN
• Suspension• Braking• Steering• Body• Frame• Safety• Flotation• Aesthetics
VEHICLE COST ANALYSIS
$500Safety
$200Steering &
Braking
$2560Total
$250Chassis & Suspension
$700Frame & Body
$910Powertrain
VEHICLE ASSEMBLY
TESTING
• MAX SPEED: 27-30 MPH• ACCELERATION: Max speed reached in 70 ft• TOWING: 6400 LBS at 8 MPH (1999 GMC Sierra 1500)• ENDURANCE: • FLOTATION: Water line at engine mount with 200 lb driver• HANDLING: Land: 4.5 ft turning radius
Water: Cutting brakes and tires operate
SPECS ANALYSIS
• Max Velocity: Sacrifice top speed for power and cost• Acceleration: Max speed within 70 ft (Meets spec)• Towing: 6800 lbs at 8 mph (Meets spec)• Weight: 477 lbs (Meets spec)• Dimensions: 56” x 96” (Meets spec)• Cost: $2560 (Meets spec)• SAE Rules: Confirm at competition
ACKNOWLEDGEMENT
SPONSORS:• B.A.R. Racing• Engelhard• FAMU-FSU COE• Lee’s Machine• Spencer Faurot• Ford• Recycled Cycles• Signs Unlimited
SPECIAL THANKS:• Valorie Brinson• Dean C.J. Chen• Tim Gamble• Ed Hill• Dr. Hollis• Justin Kramer• Dr. Luongo• Lee Middleton• Patrick Middleton• Ben Robertson
REFERENCES
INTERNET:• www.howstuffworks.com• www.kartworld.com• www.gokartsupply.com• www.eng.fsu.edu/ME_senior_design/2003/team3
TEXT:• Automotive Engineering (Thomas)• Machine Design (Hollis)
COMPETITION
• Heigh-ho, heigh-ho, it’s off to Orlando we go…