1. SAE Mini Baja: Drivetrain
By: Chris Gilson & Spencer Suggs
Advisor: Ho-hoon Lee
Instructor: Cris Koutsougeras
ET493

3. What is Mini-baja?
The SAE mini-baja is an international engineering challenge to design and build an off-road vehicle
This vehicle will go through many stress tests:
Acceleration
Off-road terrain
Steep incline
Endurance

4. CVT Transmission & Differential
Main components
CVT Transmission & Differential
Engine

5. Engine The engine is a Briggs & Stratton 10HP OHV Intek, Model 19
Cost: $250.00
We will need to work with the framing team to locate the position and design a mount to hold the engine in place with minimal movement

6. CVT Transmission
The continuously variable transmission is an automatic transmission that can change seamlessly through a range of gear ratios
Commonly used in ATV / off-road utility vehicles

7. Differential Options: (SRA) solid rear axle suspension
(IRS) independent rear suspension
SRA
IRS

8. Solid rear axle (SRA) suspension
PROS:
Greater power transfer
Better straight line performance
Less chance of mechanical failure
More cost efficient
CONS:
Less suspension travel
Rougher ride quality
Less ground clearance

9. SRA

10. Independent rear suspension (IRS)
PROS:
Greater suspension travel
Better ride quality
Greater cornering performance
Higher ground clearance
CONS:
Less power transfer
Higher cost
Higher chance of mechanical failure

11. IRS

12. Deliverables Chris Gilson Spencer Suggs Both
Design of engine mounting bracket
Engine mounting bracket stress analysis
Analysis of available gear ratios
Power loss through the power-train
Spencer Suggs
Design of CVT mounting brackets
CVT mounting bracket stress analysis
Mounting bracket bolt analysis
Mounting bracket bolt grade selection
Both
Ideal position of power-train
Computation of the max torque of the wheels

13. timeline Week 1 – Week 2 Week 3 – Week 4 Week 5 – Week 6
Find the ideal position for the drive-train
Week 3 – Week 4
Drive-train mounting bracket design
Drive-train mounting bracket stress analysis
Week 5 – Week 6
Mounting bracket bolt stress analysis
Mounting bracket bolt grade selection
Week 7 – Week 8
Analysis of available gear ratios
Power loss through drive-train
Week 9
Final Presentation

14. Going forwrd Begin to order parts needed Machine parts to spec
Begin Assembly
Test

15. References