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DMTB Engineering

DMTB Engineering. Presentation 1: Research and Concept Selection Mini Baja Gearbox February 6, 2014. Agenda. Problem Definition; Design Constraints; Research; Conclusions; and Project Plan for Next Steps. Problem Definition.

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DMTB Engineering

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  1. DMTB Engineering Presentation 1: Research and Concept Selection Mini Baja Gearbox February 6, 2014

  2. Agenda • Problem Definition; • Design Constraints; • Research; • Conclusions; and • Project Plan for Next Steps.

  3. Problem Definition • Create a simple mechanical gearbox for use in a Mini Baja off-road vehicle. • Objectives Include: • Must have forward and reverse gears; • Must be robust yet relatively lightweight; • Must be cost effective; and • Must produce a suitable final drive reduction ratio.

  4. Design Constraints • Size/Weight • Motor& Transmission • 10 HP Briggs & Stratton engine • Continuously Variable Transmission • Budget Source: Memorial Baja

  5. Research

  6. GEARS • Parallel Axis Gears • Spur • Helical • Gear Materials

  7. SHAFTS • Three types of shafts we are concerned with when talking about gearboxes: • Input Shaft • Countershaft • Output Shaft • Shaft Materials

  8. GEAR ATTACHMENT • There are various ways we can attach the gears to the shafts: • Setscrew • Keyway • Circlip • Shear Pins • Locking Assembly

  9. GEARBOX HOUSING • Fluid Tight Container to Hold Lubricant • Provides Support For Internal Components • Supports External Forces on the Shaft • Provides Convenient Access to Internal Components For Inspections • Potential Materials • Cast Aluminum • Unique Shapes • Billet Aluminum • More Precise (CNC) • Composite Material • High Performance • Combination of Durability & Lightweight

  10. Conclusions

  11. DMTB Gearbox • Gears will be steel spur gears; • Shafts will be steel alloy; • Housing will be milled from billet aluminum; and • Final output will be an internally splined female connection.

  12. Proposed Output Design • Benefit of a splined joint as opposed to key way; • Narrow mating surface decreases the amount of plunge needed in CV joints; and • Pre-made half shafts mean easy replacement in the event of failure. Source: Pure Polaris

  13. Project Plan • Gear Layout; • CAD Model; • Force Analysis; and • Drawing Package.

  14. Questions? www.dmtbeng.weebly.com

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