Automotive Transmission

Principle of operation, Requirements of Clutch, Constructional details Different types of clutches- Single plate coil spring and Diaphragm spring clutches, and multi-plate clutch, Centrifugal and Automatic Clutch, Dry and Wet type of clutch, Friction lining materials, Factors influencing clutch wear & points of wear, Clutch Design, Clutch faults- Diagnosis & Remedies.

Need for Transmission system, Forces acting on vehicle, Tractive Effort, Gear box Objective of the Gear Box, Determination of gear ratios for vehicles, Power-Torque Characteristics, Performance characteristics in different speeds, Different types of gear boxes – sliding, constant and synchromesh type, Planetary gear box, Need for double declutching and working of synchronizing unit. Power and economy modes in gearbox, Transfer box, Transaxles, Overdrives. Gear shifting mechanisms, mechanical link and wire types, Gear box maintenance

Fluid Coupling & One way clutches: Fluid coupling-Principle-Constructional details. Torque capacity. Performance characteristics. Reduction of drag torque in fluid coupling. Fluid requirements and characteristics One way clutches (Over running clutch) Constructional details of various types, percentage slip, like sprag clutch, ball and roller one way clutches, necessity and field of application, working Hydrodynamic Torque converters: Introduction to torque converters, Principle constructional details, performance characteristics. Comparisons characteristics, Multistage torque converters and Polyphase torque converters.

• Hydrostatic drive – principle, types, advantages, limitations - Comparison of hydrostatic drive with hydrodynamic drive - Construction and working of typical Janny hydrostatic drive. Electrical drives: advantages and limitations, principles of Ward Leonard system of control Modern electric drive for buses and performance characteristics.
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Automatic transmissions relative merits and demerits when compared to conventional transmission, Components of Automatic Transmission, Types of Automatic transmission - Automated manual transmission (AMT), Automatic step transmission (AT), Dual-clutch transmission (DCT), Continuously variable transmission (CVT) Epicyclic Gear Box- Principle of Planetary gear trains. Introduction to epicyclic gear train – external mesh and internal mesh planetary geartrains, The fundamentals of a hydraulic control system, basic four speed hydraulic control system.