302051: Design of Transmission Systems

Unit 1 Spur and Helical Gears 07 Hrs.
Introduction to gears: Material selection for gears, Modes of gear tooth failure, Gear Lubrication
Methods.
Spur Gears: Number of teeth and face width, Force analysis, Beam strength (Lewis) equation,
Velocity factor, Service factor, Load concentration factor, Effective load on gear, Wear strength
(Buckingham’s) equation, Estimation of module based on beam and wear strength, Estimation of
dynamic tooth load by velocity factor and Buckingham’s equation.
AGMA (American Gear Manufacturing Association) approach of Gear design (Only mathematical
relations, no numerical)

Helical Gears: Force analysis of Helical Gear, Beam Strength of Helical Gear, Wear strength and
estimation of effective load based on Velocity factor (Barth factor) and Buckingham’s equation. (No
numerical on force analysis of helical)
Unit 2 Bevel and Worm Gear 08 Hrs.
Bevel Gears: Types of Bevel gears, Terminology, Virtual number of teeth, and force analysis of
Straight Bevel Gear. Design of Straight Bevel Gear based on Beam Strength, Wear strength and
estimation of effective load based on Velocity factor (Barth factor) and Buckingham’s equation.
(Simple numerical to be taken no design calculations)
Worm Gears: Worm and worm gear terminology and proportions of worm and worm gears, Force
analysis of worm gear drives, Friction in Worm gears, efficiency of worm gears, Worm and worm
gear material, Strength and wear ratings of worm gears (Bending stress factor, speed factor, surface
stress factor, zone factor) IS 1443-1974, Thermal consideration in worm gear drive.
(Simple numerical to be taken no design calculations)
Unit 3 Sliding and Rolling Contact Bearing 07 Hrs.
Sliding contact bearing (Theoretical treatment only): Introduction to sliding contact bearing,
classification, Reynolds’s equation (2D), Petroff’s equations, Sommerfeld number, Parameters of
bearing design.
Rolling Contact Bearings: Types of rolling contact Bearings and its selection, Static and dynamic
load carrying capacities, Stribeck’s Equation, Equivalent bearing load, Load-life relationship,
Selection of bearing life, Selection of rolling contact bearings from manufacturer's catalogue,
Design for cyclic loads, Types of failure in rolling contact bearings - causes and remedies. (Simple
Numerical treatment)
Unit 4 Design of Clutches and Brakes 07 Hrs.
Clutches: Introduction, Types of clutches, Material, Positive clutches, friction clutches, single plate,
multiple plate, Cone clutch, and centrifugal clutches, Application of friction clutches automotive and
industrial machinery sector. (Only Theoretical Treatment)
Brakes: Introduction, Types of brakes, Material, Design of band brake, external and internal shoe
breaks internal expanding shoe brakes, design of disc brakes. Application of brakes in automotive
and industrial machinery sector. (Only Theoretical Treatment)
Unit 5 Design of M/C Tool Gear Box 08 Hrs.
Introduction to Machine Tool Gearboxes, classification, basic considerations in design of drives and
its Applications, Determination of variable speed range, Graphical representation of speed and
structure diagram, Ray diagram, selection of optimum ray diagram, Kinematic /Gearing Diagram,
Deviation diagram, Difference between numbers of teeth of successive gears in a change gear box.
(Note: Full design problem to be restricted up to 2 Stages only & No design problem on
deviation diagram)
Unit 6 Transmission system in Hybrid Electric Vehicle 08 Hrs.
Introduction, Types of Hybrid Electric Vehicles: Basic Classification, Basic Modes of Operation,
Other Derivatives, Degree of Hybridization. Power Split Devices (PSD): Simple and EM compound
PSD, HEV Component Characteristics: The IC Engine, Electric Machines, Battery, HEV
Performance Analysis: Series HEV, Parallel HEV, HEV Component Sizing: General
Considerations, Sizing for Performance, Optimum Sizing, Power Management: Control Potential,
Control.

Books and other resources

Text Books:
1. Shigley J.E. and Mischke C.R., Mechanical Engineering Design, McGraw Hill Publication
Co. ltd.
2. Spotts M.F. and Shoup T.E., Design of Machine Elements, Prentice Hall International.
3. Bhandari V.B, Design of Machine Elements, Tata McGraw Hill Publication Co. Ltd.
4. Juvinal R.C, Fundamentals of Machine Components Design, John Wiley and Sons.
References Books:
1. Design Data - P.S.G. College of Technology, Coimbatore.
2. Vehicle Powertrain Systems by Behrooz Mashadi, David Crolla. A John Wiley & Sons, Ltd
3. Automobiles–Power trains and Automobiles–Dynamics by Crolla, David, A John Wiley
&Sons, Ltd
4. Automotive Engineering Powertrain, Chassis System and Vehicle Body by David A Crolla,
Elsevier B H New York, London, Oxford.
5. lack P.H. and O. Eugene Adams, Machine Design, McGraw Hill Book Co. Inc.
6. Willium C. Orthwein, Machine Components Design, West Publishing Co. and Jaico
Publications House.
7. P. Kannaiah, Design of Transmission systems‖, SCIETCH Publications Pvt Ltd.
8. C.S. Sharma and Kamlesh Purohit, Design of Machine Elements, PHI Learning Pvt. Ltd.
9. D.K. Aggarwal& P.C. Sharma, Machine Design, S.K Kataria and Sons.
10. P. C. Gope, Machine Design: Fundamentals and Applications, PHI Learning Pvt. Ltd.
11. Bhandari, V. B. Machine Design data book, Tata McGraw Hill Publication Co. Ltd.
12. K. Mahadevan, K. Balveera Reddy, Design Data Handbook for Mechanical Engineers, CBS
Publishers.