Project report on automatic transmissions
- 1. AUTOMATIC TRANSMISSON AUTOMATIC TRANSMISSON A project report A project report submitted in partial fulfillment of the Requirements for the award of the degree of submitted in partial fulfillment of the Requirements for the award of the degree of Bachelor of Technology (B.Tech) Bachelor of Technology (B.Tech) Submitted by Submitted by SOMNATH DAS 21012495051 SOMNATH DAS 21012495051 MILAN DHABAL DEB 21012495029 MILAN DHABAL DEB 21012495029 SOMDEEP MANDAL 21012495049 SOMDEEP MANDAL 21012495049 ROHIT PRAMANIK 21012495043 ROHIT PRAMANIK 21012495043 MIHIR MANDAL 21012495028 MIHIR MANDAL 21012495028 MANJEET PRASAD 21012495027 MANJEET PRASAD 21012495027 Under the supervision of Under the supervision of SANJAY KUMAR MAHATO SANJAY KUMAR MAHATO Assistant professor Assistant professor DEPARTMENT OF MECHANICAL ENGINEERING DEPARTMENT OF MECHANICAL ENGINEERING MARYLAND INSTITUTE OF TECHNOLOGY AND MANAGEMENT, GALUDIH, JAMSHEDPUR MARYLAND INSTITUTE OF TECHNOLOGY AND MANAGEMENT, GALUDIH, JAMSHEDPUR JHARKHAND. JHARKHAND. SESSION : 2021-2025 SESSION : 2021-2025
- 2. CERTIFICATE CERTIFICATE This is to certify that Project Report entitled “ This is to certify that Project Report entitled “AUTOMATIC TRANSMISSON AUTOMATIC TRANSMISSON” is submitted by Our Team in partial ” is submitted by Our Team in partial fulfilment of the requirement for the award of degree of Bachelor of Technology in Mechanical Engineering from fulfilment of the requirement for the award of degree of Bachelor of Technology in Mechanical Engineering from Maryland Institute of Technology and Management, under Jharkhand University of Technology (JUT). The project Maryland Institute of Technology and Management, under Jharkhand University of Technology (JUT). The project embodies result of original work and studies carried out by students themselves and the contents of the project do not embodies result of original work and studies carried out by students themselves and the contents of the project do not form the basis for the award of any other degree to the candidate or to anybody else. form the basis for the award of any other degree to the candidate or to anybody else. (H.O.D) (External) (Project In-Charge) (H.O.D) (External) (Project In-Charge)
- 3. DECLARATION DECLARATION I do here by declare that the thesis entitled “ I do here by declare that the thesis entitled “AUTOMATIC TRANSMISSON AUTOMATIC TRANSMISSON” ” submitted in the Dept. of Mechanical engineering, Maryland Institute of submitted in the Dept. of Mechanical engineering, Maryland Institute of Technology and Management, under Jharkhand University of Technology (JUT), Technology and Management, under Jharkhand University of Technology (JUT), in practical fulfilment of requirement for the award 7 in practical fulfilment of requirement for the award 7th th semester B.Tech Degree in semester B.Tech Degree in Mechanical Engg. Is an authentic work carried out by us during the year 2024-25. Mechanical Engg. Is an authentic work carried out by us during the year 2024-25. SOMNATH DAS SOMNATH DAS MILAN DHABAL DEB MILAN DHABAL DEB SOMADEEP MANDAL SOMADEEP MANDAL ROHIT PRAMANIK ROHIT PRAMANIK MIHIR MANDAL MIHIR MANDAL MANJIT PRASAD MANJIT PRASAD
- 4. Introduction Introduction • Device which changes gear ratios automatically Device which changes gear ratios automatically • Deliver maximum efficiency Deliver maximum efficiency • Difference between automatic and manual Difference between automatic and manual transmission transmission • Easier to drive because they do not have a clutch pedal Easier to drive because they do not have a clutch pedal or gearshift lever or gearshift lever • There are two type of automatic transmissions There are two type of automatic transmissions
- 5. CLASSIFICATION CLASSIFICATION AUTOMATIC AUTOMATIC TRANSMISSIONS TRANSMISSIONS USING PLANETARY USING PLANETARY GEARS GEARS CONTINUOUSLY VARIABLE CONTINUOUSLY VARIABLE TRANSMISSION(CVT) TRANSMISSION(CVT)
- 6. AUTOMATIC TRANSMISSIONS AUTOMATIC TRANSMISSIONS USING PLANETARY GEARS USING PLANETARY GEARS Components Components • PLANETARY GEAR PLANETARY GEAR SYSTEM SYSTEM • TORQUE CONVERTER TORQUE CONVERTER • HYDRAULIC SYSTEM HYDRAULIC SYSTEM • GOVERNOR GOVERNOR • COMPUTER COMPUTER CONTROLS CONTROLS
- 7. 1. Sun gear 2. Planet gear 3. Ring gear 4. Planetary carrier PLANETARY GEAR SYSTEM
- 8. PLANETARY GEAR SYSTEM (SIDE VIEW)
- 9. 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.
- 10. TORQUE CONVERTOR
- 11. 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
- 12. Gear pump Gear pump Oil 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.
- 13. Valve Body 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.
- 14. 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.
- 15. Band Band • A band is a steel strap with friction material bonded to the inside surface.
- 16. GOVERNER GOVERNER • provides the inputs that tell provides the inputs that tell the transmission when to shift the transmission when to shift • connected to the output shaft connected to the output shaft and regulates hydraulic and regulates hydraulic pressure based on vehicle pressure based on vehicle speed speed
- 17. COMPUTER CONTROLLS COMPUTER CONTROLLS • Detect such things as throttle position, vehicle Detect such things as throttle position, vehicle speed, engine speed, engine load,etc. to control speed, engine speed, engine load,etc. to control exact exact shift points shift points • Downshift automatically when going downhill, to Downshift automatically when going downhill, to control speed and reduce wear on the brakes. control speed and reduce wear on the brakes. • Up shift when braking on a slippery surface to Up shift when braking on a slippery surface to reduce the braking torque applied by the engine. reduce the braking torque applied by the engine. • Inhibit the Up shift when going into a turn on a Inhibit the Up shift when going into a turn on a winding road. winding road.
- 18. CONCLUSION CONCLUSION Automatic transmissions contain mechanical systems, hydraulic systems, electrical systems and computer controls, all working together in perfect harmony