18AU55 Automotive Transmission syllabus for AU

Clutch: Necessity of clutch in an automobile, requirements of a clutch, Clutch materials, clutch lining, different types of clutches, friction clutches-Single plate clutch, multi plate clutch, cone clutch, centrifugal clutch, electromagnetic clutch, hydraulic clutches, Vacuum operated clutch, Clutch adjustment, Clutch troubles and their causes, Numerical problems.

Fluid Coupling & One way clutches: Constructional details of various types, percentage slip, one way clutches (Over running clutch) like sprag clutch, ball and roller one way clutches, necessity and field of application, working fluid requirements, fluid requirements, fluid requirements and fluid coupling characteristics.

Hydrodynamic Torque converters: Introduction to torque converters, comparisons characteristics, slip, principles of torque multiplication, 3 and 4 phase torque converters, typical hydrodynamic transmission.

Power Required for Propulsion: The need for transmission,Various Resistances to Motion of the Automobile, Traction, tractive effort Performance curves, acceleration gradeability, drawbar pull, Numerical Problems.

Transmission: Necessity of gear box, Calculation of gear ratios for vehicles, Performance characteristics in different gears , Desirable speed ratios of gear boxes, Constructional details of - Sliding-

Epicyclic Transmission: Principle of operation, types of planetary transmission, Wilson planetary transmission, Ford-T model gear box , Pre selective mechanism, Vacuum control, pneumatic control, hydraulic control in the planetary gear system, Over drives, Numerical problems.

Hydrostatic Drives: Principles of hydrostatic drives, different systems of hydrostatic drives, constant displacement pump and constant displacement motor, variable displacement pump and constant displacement motor and variable displacement motor, variable displacement pump and variable displacement motor, applications, plunger type pump and plunger type motor, advantages and limitations, typical hydrostatic drives, hydrostatic shunt drives.

Automatic Transmission: Principle, general description and Working of representative types like Borge - warner, 4-speed and 6-speed automatic transmission longitudinally mounted four speed automatic transmission, hydramatic transmission, the fundamentals of a hydraulic control system, basic four speed hydraulic control system.

Course Outcomes:

At the end of the course the student will be able to:

• Explain the Constructional, design and working principles of different types of clutches, fluid couplings, torque convertors, different gear box etc..
• Determine the gear ratio, speed of vehicle and number of teeth on driving and driven gears.
• Explain the constructional and principle of operation of different types epicyclic gear box, Calculation of gear ratio for epicyclic gear box.
• Explain the necessity, advantages, constructional and principle of operation of different types of automatic transmissions and hydraulic control.

Question paper pattern:

• The question paper will have ten full questions carrying equal marks.
• Each full question will be for 20 marks.
• There will be two full questions (with a maximum of four sub- questions) from each module.

Textbook/s

1 Automotive Mechanics N.K. Giri Khanna Publication, New Delhi 2014

2 Advanced Vehicle Technology Heinz Heisler 2002.

Reference Books

3 Automotive Transmissions and Power trains Crouse W.H McGraw Hill Co. 5thedn, 1976.

4 Motor Vehicle Newton K and Steeds. W Butter Worth’s & Co. Publishers Ltd, 1997.

5 Automobile Engineering Kirpal Singh Standard Pub. 2011.