1. SAE Mini Baja GROUP MEMBERS: JOHN MERRITT FRANCES OTHERSEN CHRIS DAVIS
JAMES CHAPMAN
JOSEPH FANNING

2. Objective
Purpose: Design and build an off road vehicle to meet the specifications of the SAE Baja competition.
Tasks:
Design a rear suspension to include passive rear steering and design a traditional trailing link.
Design a two speed gearbox with spur gears.
Total Budget: $12,000
Projected Completion date: April 30, 2015
Goal: Place in the top ½ of competitors overall.

3. Work Breakdown Gearbox Members: Suspension Members: Chris Davis
John Merritt
Overall team leader
Lead Design
Frances Othersen
Analytical testing
Scribe
James Chapman Design/Material Selection
Suspension Members:
Chris Davis
Analytical Testing
Scribe
Joseph Fanning
Lead design

4. Gantt Chart

5. Budget Analysis
The total budgeted cost that we have accumulated so far is $1,171.28
We have chosen to go with a spur gearbox vs. the helical gear box with some of the main issues being time to manufacture and cost. A helical would take about three weeks at $2000 vs .the Spur at about $700 plus and 2-3 business days to acquire
In addition we have chosen to go with a standard trailing arm link suspension vs. the passive rear steer with similar issues of time and cost to manufacture. For example going with the standard link suspension system will be about $700 cheaper and we will have less components to manufacture

6. Current Gearbox Progress
Top View
Side View
Gear Ratios: :1
11.2:1
Isometric View

7. Gearbox Analytical Test
Gear 6 Maximum Deflection:
3.354e-005 inch
Gear 5 Maximum Deflection:
2.855e-005 inch

8. Rear Suspension Traditional Trailing Arm
Isometric View
Rear View

9. Current Rear Suspension with Passive Rear Steer Progress
Pivots about two points
Mounting point allows for one extra degree of freedom
Isometric View Assembly

10. Current Rear Suspension with Passive Rear Steer Progress
Completed swing arm design with passive steering
Right Side View
Top View

11. Current Rear Suspension Progress
Side View Assembly
Rear View Assembly

12. Rear Swing Arm Analysis
Analytical Test SolidWorks
Analytical Test SolidWorks
Deformation results without shock absorbers:
Patran:
Max deformation 6.94e-001 in
SolidWorks:
Max deformation: 2.545e-003 in

13. Rear Passive Steering Knuckle Analysis
Force Applied=
½ * Driver Weight + ½ * Cart Weight
Results:
Max deformation of hub = 2.27e-005 in
Max deformation mounting points = 2.058e-003 in

14. Next Steps
Analytical testing of specific areas of concentrated stresses
Order remaining material
Manufacturing
Testing fitting
Assembly
Driver Selections
Competition preparation
Frame Design

15. THANK YOU