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Continuous Variable Transmissionm, PPTX
- 2. Contents • Introduction. • Timeline. • Components. • Working Principle. • Types of CVTs. • Advantages & Disadvantages. • Applications. • Conclusion. • References.
- 3. Transmission • Thejob of the transmission is tochange the speed ratio between the engine and the wheels of an automobile. • Thetransmission usesarange of gears-- from low tohigh -- to make engine's torque asdriving conditions change.
- 4. Introduction • CVT is an advanced technology of automatic transmission. • Unlike traditional automatic transmissions, continuously variable transmissions don't have a gearbox with a set number of gears. • single-speed transmission, gearless transmission, one-speed automatic, variable pulley transmission. • Shifts automatically with an infinite number of ratios. • CVT allows for the operation at the lowest possible speed and highest possible load, partially avoiding the low efficiency region of the engine map.
- 6. Timeline •1935 - Adiel Dodge receives U.S. patent for toroidal CVT Austin 16
- 10. Timeline Saturn Vue with CVT_______________________________2002 Saturn Vue
- 12. Manufacturers
- 13. Components • Input shaft, output shaft, metal belt. • Continuously variable RPM. • Pulleys and sheaves. • Cogged v-belt, metal belt, CVT chain. • Variomatic with centrifugal weights. • Use of hydraulic oil pump.
- 14. Components
- 15. Components
- 16. Components
- 17. How does it works…..?
- 18. Video clip
- 19. Types of CVT Based on the Design... • Variable diameter pulley transmission. • Hydrostatic CVT. • Frictional CVT. • Toroidal or roller based CVT. • Magnetic CVT.
- 20. Variable Diameter Pulley Transmission
- 22. Hydrostatic CVT
- 25. Video clip
- 26. Frictional CVT Tmax = Cf × FN × Ro
- 27. Moving belt Output drive to workshop machinery Driver input from power source
- 28. Toroidal CVT
- 31. Video clip
- 32. Magnetic CVT
- 33. Middle ring with steel structure Inner ring with low no. of magnets outer ring with high no. of magnets
- 36. Applications • magnetic CVTs are used in hybrid vehicle powertrains for cars, buses, trucks and off-highway vehicles. • Toroidal CVT are already being used in hybrid cars. • Tractors. • Golf Carts. • Ride on Lawn Mowers. • Motorized Wheelchairs. • Bicycles. • Power tools. • Minimachines
- 37. Advantages & Disadvantages Advantages Smoother operation than hydraulic automatic transmissions. CVTs offer a continuum of infinitely variable gear ratios. It consists of very few components. Disadvantages Size and weight of CVTs. Difficulty in transmitting high torque at low operating speeds, which so far has limited their use to small vehicles. Difficulty in transmitting high torque at low operating speeds, which so far has limited their use to small vehicles due to usage of wear and tear materials like belt or chain.
- 38. Latest update in CVT TOYOTA MOTOR DIRECT SHIFT GEAR TRAIN
- 40. NISSAN'S XTRONIC CVT NISSAN'S XTRONIC CVT
- 41. Conclusion • The continuously variable transmission is a great innovation and will have a great effect on the car industry and on society in general. • The improved fuel consumption and improved control of the engine’s speed range will help to reduce gas emissions. • Different car companies have different designs which make each unique to the builder, however they are based on the same basic principles of the systems discussed here.
- 42. References • www.howstuffsworks.com • https://images.app.goo.gl/gfH1rdqpYoZLeRNT9 • http://juke-passion.info/viewtopic.php?t=554 • https://www.youtube.com/watch?v=qxZFSNITK-c • https://www.youtube.com/watch?v=nf2JrppTClk • https://www.youtube.com/watch?v=nayVR2PAWHo&t=101s • https://autopolis.wordpress.com/2011/11/30/1987-1994-subaru-justy-standing-out-in-a-crowd/ • http://www.odec.ca/projects/2007/viva7s2/conclusion.htm