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Infinitely Variable Transmission

Infinitely Variable Transmission. Dalhousie University Mechanical Engineering. The Team. Well, Dr. Hubbard hoped we’d fail the first time…. Joel Kaser Craig Martin Blair Mountain Kirby Nickerson. 2006 SAE MINI-BAJA. Infinitely Variable Transmission (IVT) Design, Build, and Test

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Infinitely Variable Transmission

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  1. Infinitely Variable Transmission Dalhousie University Mechanical Engineering

  2. The Team Well, Dr. Hubbard hoped we’d fail the first time… • Joel Kaser • Craig Martin • Blair Mountain • Kirby Nickerson

  3. 2006 SAE MINI-BAJA • Infinitely Variable Transmission (IVT) • Design, Build, and Test • Improvements

  4. DESIGN REQUIREMENTS • IVT designed for Mini Baja power, size and shape • Weight of IVT is to be less than 31lbs • Vibration free • Maintenance free throughout Baja Competition • Total cost less than $1000.00

  5. CVT and IVT’s • Most CVT’s use varying pulley diameters • Range between fixed limits (1 to 4) • IVT range is 0 to 1 • Acts as a clutch • 70% versus 90% efficient

  6. Infinitely Variable Transmission IVT Mechanics

  7. IVT Mechanics FundamentalIVT Functional Components

  8. IVT Mechanics • Output from Engine is Input to IVT • Input Yoke Spins Masses via Pins and Links • Masses are Fixed to bearings which sit on lobes • Lobes have offset shaft bore, creating moment arm

  9. IVT Mechanics • Rotation of masses creates a moment about arm assembly shaft • As mass spins relative to lobe, direction of torque changes • Oscillation of torque direction results in oscillation of arm shaft rotation

  10. IVT Mechanics • Oscillating shaft disadvantageous • Set of one-way clutches stop counter-clockwise rotation of arm assembly shaft. • Arm assembly shaft oscillates between no motion and clockwise rotation • Do not want output shaft to exhibit stop/go movement

  11. IVT Mechanics • To achieve consistent output shaft rotation, additional set of clutches in output shaft • These clutches clamp onto arm assembly shaft, operate opposite direction of earlier clutches • When arm assembly shaft rotates clockwise, clutches clamp, causing output shaft to rotate • When arm assembly stops, clutches release, allowing output shaft free rotation

  12. Infinitely Variable Transmission Model Demonstration

  13. Infinitely Variable Transmission Design Improvements

  14. Previous Issues • Failing Bearings • Complex Masses • Bearings shifting off lobes (axial play) • Bending in Cantilevered Arm Assembly

  15. Improvements • Masses • Rectangular for easier manufacturing/testing • Roller Bearings with Inner Race • - Eliminated need for hardened steel lobes • - Easier Manufacturing • - Increased to 1.5” ID for better load rating

  16. Improvements • Lobes • standard steel vs. hardened • Lip and c-clip to prevent bearing axial motion • ¼” offset for greater torque • increased to 1.5” OD • Brass spacers between lobes • Yoke Pins (red) • Spacers added to restrict axial motion • Arm Support (yellow) • Retained by spring pin to make body + arm + support one solid assembly

  17. Improvements • Yoke Body • Second bearing (red) to prevent cantilevered bending • Moved input shaft out of body ½” • Arm Assembly Shaft • 5/8” ASTM 1144 to resist shear • Extended ½” to allow second bearing to prevent cantilevered bending

  18. Infinitely Variable Transmission Baja / IVT Modeling

  19. Baja/IVT Modeling

  20. Baja/IVT Modeling

  21. Infinitely Variable Transmission Current Status

  22. Current Status • Final Stages of Development • Correctly Model Baja Vehicle • Race Technology AX22 Computer • Optimization of Masses

  23. Infinitely Variable Transmission Conclusion

  24. Conclusion • IVT designed to meet all weight and geometry constraints • 52 km/hr • 28 lb • Design will work • Desktop model • Model Baja • IVT prototype functional by end of January

  25. Questions

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