New Traction Drive Pairing with Inner Spherical Rotor for Automobile Usage Depart of Mechanical Design, Pusan National Univ. South Korea. Researcher: Ilkeun.

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Presentation transcript:

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 1.Driving / driven rotor 2.Traction ball assembly 3.Pressure device 4.Ratio changer - Basic components

Operation principle - ISCVT assemnly

Operation principle - Pressure device

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

Operation principle - Ratio changer and speed ratio

Numerical investigation ▪ Max. power 110 kW / 6,000 RPM ▪ Max. torque 194 N·m / 4,500 RPM ▪ Overall speed ratio 0.09~0.37 ▪ Driving / driven rotor diameter range 100 ~ 200 mm ▪ Radius of traction ball range 10~50 mm ▪ height of traction ball pivot range 50 ~ 100 mm ▪ Preloading thrust forces range 0.1 ~ 500 N ▪ Cam lead angle range 0.1 ~ 50° - Design specification for the passenger car

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

Numerical investigation Optimal design variables ▪ Radius of driving / driven rotor 125 mm ▪ Radius of traction ball 43.3 mm ▪ Height of traction ball pivot 52 mm ▪ Cam lead angle 36° ▪ Preloading thrust force 220 N Transmission performances ▪ Transmission efficiency 93 % ▪ Ratio changer work 263 joul ▪ Life time 10,800 hour ▪ Maximum shear stress 552 MPa ▪ Gradeability 20° - Simulation results

Stress analysis - Driving rotor, traction ball, - Frame and bearing housing

Performance analysis Transmission efficiency (%)

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

Performance analysis Life time (Hour) Driving rotor Driven rotor

Performance analysis Ratio changer work (Joul)

Performance analysis Gradeability (Degree)

Capacity expantion Transmission efficiency (%)

Capacity expansion Maximum shear stress (MPa)

Capacity expansion Life time (Hour)

Comparison with toroidal CVT Performance analysis

Comparison with toroidal CVT Performance analysis

Comparison with toroidal CVT Performance

Comparison with toroidal CVT Power density

Apply to the automobile

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.