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AUTOMATIC TRANSMISSION

Explore the world of automatic transmissions in vehicles, presented by Muhammed Riyas and guided by Gopinathan. Learn about the classification, components, and workings of automatic transmissions using planetary gears and CVT. Discover the intricate hydraulic system, torque converter, and computer controls that ensure smooth shifting for 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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