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AUTOMATIC TRANSMISSION

AUTOMATIC TRANSMISSION. Presented By, Guided By, Muhammed Riyas Gopinathan.V S 7 M B Asst:Prof NO:103 Dept of Mechanical Engg. Introduction. Device which changes gear ratios automatically Deliver maximum efficiency

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AUTOMATIC TRANSMISSION

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  1. AUTOMATIC TRANSMISSION Presented By, Guided By, Muhammed Riyas Gopinathan.V S7MB Asst:Prof NO:103 Dept of Mechanical Engg

  2. Introduction • Device which changes gear ratios automatically • Deliver maximum efficiency • Difference between automatic and manual transmission • Easier to drive because they do not have a clutch pedal or gearshift lever • There are two type of automatic transmissions

  3. CLASSIFICATION • AUTOMATIC TRANSMISSIONS USING PLANETARY GEARS • CONTINUOUSLY VARIABLE TRANSMISSION(CVT)

  4. AUTOMATIC TRANSMISSIONS USING PLANETARY GEARS Components • PLANETARY GEAR SYSTEM • TORQUE CONVERTER • HYDRAULIC SYSTEM • GOVERNOR • COMPUTER CONTROLS

  5. Sun gear 2. Planet gear 3. Ring gear 4. Planetary carrier • PLANETARY GEAR SYSTEM

  6. PLANETARY GEAR SYSTEM (SIDE VIEW)

  7. HOW PLANETARY GEARS WORK • Power transfer can only take place when one of the members is held at rest or if two of the members are locked.

  8. TORQUE CONVERTOR • takes the place of the clutch • found on standard shift vehicles • large doughnut shaped device that is mounted • between the engine and the transmission • it uses oil or transmission fluid to transmit power • three internal elements that work together • to transmit power to the transmission.

  9. TORQUE CONVERTOR

  10. THE HYDRAULIC SYSTEM • complex maze of passages and tubes that sends transmission fluid under under pressure to all parts of the transmission • and torque converter. • Transmission fluid serves in shift control, general lubrication and transmission cooling. • Keeps the transmission at normal operating temperature • OIL PUMP • VALVE BODY • SHIFT VALVES • BANDS

  11. Gear pumpOil Pump • Produce all the oil pressure that is • required in the transmission • The oil is then sent, under • pressure to the pressure regulator, • the valve body and the rest of the • components, as required.

  12. Valve Body • The brain of the automatic transmission • Contains a maze of channels and passages that direct hydraulic fluid to the numerous valves • These valves activate the appropriate clutch pack or band servo to smoothly shift to the appropriate gear for each driving situation.

  13. Shift Valves • Supply hydraulic pressure to • the clutches and bands to • engage each gear • Determines when to shift from • one gear to the next • The 1 to 2 shift valves determines when to shift from first to second gear.

  14. Band • A band is a steel strap with • friction material bonded to the • inside surface.

  15. GOVERNER • provides the inputs that tell the transmission when to shift • connected to the output shaft and regulates hydraulic pressure based on vehicle speed

  16. COMPUTER CONTROLLS • Detect such things as throttle position, vehicle speed, engine speed, engine load,etc. to control exactshift points • Downshift automatically when going downhill, to control speed and reduce wear on the brakes. • Up shift when braking on a slippery surface to reduce the braking torque applied by the engine. • Inhibit the Up shift when going into a turn on a winding road.

  17. CONCLUSION Automatic transmissions contain mechanical systems, hydraulic systems, electrical systems and computer controls, all working together in perfect harmony

  18. THANK YOU

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