Planetary Gear SystemTeam Members: Joel Huerta, Miguel Avila, Jonathan Villamor, Richie

AunchareonpornpatFaculty Advisor: Professor Theodore Nye

CSULA BAJA Liaison: Kevin KnarrDepartment of Mechanical Engineering

College of Engineering, Computer Science, and TechnologyCalifornia State University, Los Angeles

Project Background

Objective

System Requirements and Capabilities

Mechanical System DesignMechanical System Design

Results and ConclusionResults and Conclusion

Every year for the BAJA Competition teams are given an unmodified Briggs and Stratton 10 HP OHV Intek Model Engine. Modifications are not allowed on the engine and teams must gain competitive advantages through the design of their vehicle frame, the materials used, or the type of transmission system used.

The goal of this project is to design and analyze a prototype gearbox that can be used as reference for future BAJA competitions. This prototype will be lighter and will achieve a more efficient gear ratio reduction in a more compact volume than the current gearbox being used.

No. Requirement Name Performance Objective Capabilities

1 Gear Ratio 7:1 7.03:1

2 Weight <39lbs 51lbs

3 Volume Shall Meet MICD Non Compliant

4 Transmission Modes Forward, Neutral, Reverse

Compliant

5 Max Continuous Torque >42 lb-ft >42 lb-ft

6 Max Shock Torque >293.02 lb-ft >293.02 lb-ft

7 Max G Loading 8g Compliant

8 Moisture Environment Sealed Gearbox and Bearings Compliant

9 Interface Shall Meet MICD Non Compliant

CAD DRAWING

3D Printed Parts and Mechanical Assembly

Shifting ConfigurationsGear System Design in Forward Position

Carrier spur gear is connected to output spur gear in order to provide a counter-clockwise rotation.

Gear System Design in Neutral Position Gear System Design in Reverse Position

Output spur gear is positioned between the carrier spur gear and the reverse spur gear.

Carrier spur is connected to reverse spur gear in order to provide a clockwise rotation.

• 7:1 Gear Ratio could not be met within desired volume

• Increased volume caused design to exceed required weight

• Bending and Contact Stress Analysis Performed

• Obtained Forward, Neutral, and Reverse

• Frame must be redesigned to use new gearbox

• Not in best interest to pursue a planetary gear system

Designed Gearbox in Current Vehicle Frame

Planetary Gear System Assembled Gear System