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New Traction Drive Pairing with Inner Spherical Rotor for Automobile Usage

New Traction Drive Pairing with Inner Spherical Rotor for Automobile Usage. Depart of Mechanical Design, Pusan National Univ. South Korea. Researcher: Ilkeun Ku Professor: Nogill Park. Layout. - Basic components. Driving / driven rotor Traction ball assembly Pressure device

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New Traction Drive Pairing with Inner Spherical Rotor for Automobile Usage

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  1. New Traction Drive Pairing withInner Spherical Rotor for Automobile Usage Depart of Mechanical Design, Pusan National Univ. South Korea. Researcher: Ilkeun Ku Professor: Nogill Park

  2. Layout - Basic components • Driving / driven rotor • Traction ball assembly • Pressure device • Ratio changer

  3. Operation principle - ISCVT assemnly

  4. Operation principle - Pressure device

  5. Operation principle - Traction ball assembly components 1. One pair of countor rotor 2. Two bearings 3. Countor rotor shaft 4. Countor rotor housing 5. Connector between CRA and RC

  6. Operation principle - Ratio changer and speed ratio

  7. Numerical investigation - Design specification for the passenger car

  8. Numerical investigation - Flow chart Simulation start Input design parameter • Kinematic analysis • Calculate traction ball angle range • Kinetic analysis • Direction vector declaration • Torque equilibrium Equations • Hertzian contact theory • Life time • Transmission efficiency Simulation results End program

  9. Numerical investigation - Simulation results

  10. Stress analysis • Driving rotor, traction ball, • Frame and bearing housing

  11. Performance analysis Transmission efficiency (%)

  12. Performance analysis Maximum shear stress (MPa) Driven rotor Driving rotor

  13. Performance analysis Life time (Hour) Driven rotor Driving rotor

  14. Performance analysis Ratio changer work (Joul)

  15. Performance analysis Gradeability (Degree)

  16. Capacity expantion Transmission efficiency (%)

  17. Capacity expansion Maximum shear stress (MPa)

  18. Capacity expansion Life time (Hour)

  19. Comparison with toroidal CVT Performance analysis

  20. Comparison with toroidal CVT Performance analysis

  21. Comparison with toroidal CVT Performance

  22. Comparison with toroidal CVT Power density

  23. Apply to the automobile

  24. Conclusion • Introduce a new traction drive ISCVT. • Perform kinematic / kinetic analysis and derive the speed ratio. • Numerical investigation and conceptual design on the basis of • simulation results. • ▪ CAD and stress analysis • Apply to the 110 kW automobile and evaluate its performances. • ▪ Transimssion efficiency, • ▪ Maximum shear stress • ▪ Life time • ▪ Gradeability • ▪ Ratio changer work • Comparison with toroidal CVT and the results show the better • performances.

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