AUTOMATIC AUTOMATIC TRANSMISSION TRANSMISSION Presented By, Muhammed Riyas S7MB NO:103 Engg Guided By, Gopinathan.V Asst:Prof Dept of Mechanical 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 CLASSIFICATION AUTOMATIC TRANSMISSIONS USING
PLANETARY GEARS CONTINUOUSLY VARIABLE TRANSMISSION(CVT) AUTOMATIC TRANSMISSIONS USING PLANETARY GEARS Components PLANETARY GEAR SYSTEM TORQUE CONVERTER
HYDRAULIC SYSTEM GOVERNOR COMPUTER CONTROLS 1. Sun gear 2. Planet gear 3. Ring gear 4. Planetary carrier PLANETARY GEAR SYSTEM PLANETARY GEAR SYSTEM (SIDE VIEW) 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. Input
Output Stationary Calculation Gear Ratio A Sun (S) Planet Carrier (C) Ring (R) 1 + R/S
3.4:1 B Planet Carrier (C) Ring (R) Sun (S) 1 / (1 + S/R) 0.71:1 C
Sun (S) Ring (R) Planet Carrier (C) -R/S -2.4:1 Gear Input Output Fixed
Gear Ratio 1st 30-tooth sun 72-tooth ring Planet carrier 2.4:1 30-tooth sun Planet carrier
36-tooth sun 2.2:1 Planet carrier 72-tooth ring 36-tooth sun 0.67:1 Total 2nd 1.47:1 2nd
3rd 30- and 36-tooth suns 72-tooth ring OD Planet carrier 72-tooth ring 36-tooth sun 0.67:1
Reverse 36-tooth sun 72-tooth ring Planet carrier -2.0:1 1.0:1 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. TORQUE CONVERTOR 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 Gear pump Oil 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. 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. 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.
Band A band is a steel strap with friction material bonded to the inside surface. GOVERNER provides the inputs that tell the transmission when to shift connected to the output shaft and regulates hydraulic pressure based on vehicle speed COMPUTER CONTROLLS
Detect such things as throttle position, vehicle speed, engine speed, engine load,etc. to control exact shift 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.
CONCLUSION Automatic transmissions contain mechanical systems, hydraulic systems, electrical systems and computer controls, all working together in perfect harmony THANK YOU
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