DESIGN OF TRANSMISSION SYSTEMS
(Use of approved design data book is permitted)
COURSE OUTCOMES
At the end of this course, the students will be able to
CO1: Analyze stresses in belts and select suitable V belt and Narrow V belts and chains for the given power to be transmitted
CO2: Analyze forces acting on the spur, helical, straight and spiral bevel gears and design gear drives based on strength and wear considerations for the given power to be transmitted
CO3: Design pair of worm gears
CO4: Construct ray and kinematic diagram and able to design constant mesh multi speed gear
reducer upto 18 speeds
CO5: Analyze forces in power screws and design power screws for screw jack and lathe for the given power to be transmitted.
CO6: Design single plate, multiplate clutches and internal expanding shoe brakes for automotive applications
DESIGN OF BELT AND CHAIN DRIVES (12)
Belt - Types, belt materials, stresses in belts, condition for maximum power transmission, selection of V belts for the given power and velocity ratio, Selection of Classical (3V, 5V and 8V types) and Narrow V belts (SPZ, SPA, SPB, SPC types). Chain - Types, Geometric relations, polygonal effect, selection of transmission chain and sprockets, silent chains, chain lubrication.
DESIGN OF SPUR, HELICALAND BEVEL GEARS (12)
Spur gear - Terminology, gear materials, force analysis, design of spur gear based on strength and wear considerations. Helical gear - terminology, force analysis, pressure angle in the normal and transverse planes, equivalent number of teeth, design of helical gear based on strength and wear considerations. Bevel gear - terminology, virtual number of teeth, force analysis, design of straight bevel gears. Buckingham‘s equation for dynamic load; surface strength and durability; heat dissipation; design for strength and wear
WORM GEARS AND MULTI SPEED GEAR BOX (12)
Worm gear - Terminology, materials, force analysis, thermal considerations, efficiency, design of worm gears. Gear box- Geometric progression, step ratio, ray diagram, Kinematic diagram, Design of sliding mesh gear box, constant mesh gear box, speed reducer unit; Variable speed gear box; Fluid couplings, Torque converters for automotive applications
POWER SCREWS (12)
Forms of threads, terminology, torque requirement - lifting/lowering load, self-locking screw,
efficiency, square and trapezoidal threads, collar friction, design of power screws for screw jack, lathe, selection of ball screw.
DESIGN OF CLUTHCHES AND BRAKES (12)
Clutches - role of clutches, classification, design of single plate, multiple plate and cone clutches. Brakes - Role of brakes, types, self-energizing brakes, design of internal expanding shoe brakes, calculation of heat generation and heat dissipation in brakes.
TOTAL: 60
TEXT BOOKS
1. Bhandari V.B., "Design of Machine Elements", 3rd edition, Tata McGraw Hill Publishing Co. Ltd, New Delhi, 2016
2. Joseph Edward Shigley, Charles R. Mischke, Richard Gordon Budynas, "Mechanical Engineering Design", 7th edition, McGraw Hill, Inc., New Delhi, 2012.
REFERENCES
1. Robert L Mott, "Machine Elements in Mechanical Design", Macmillan Publishing Co., London, 2010
2. Maitra G.M., "Hand Book of Gear Design", Tata McGraw Hill, New Delhi, 2012
3. Robert L Norton, "Machine Design - An Integrated Approach", Pearson Education, New Delhi, 2015
4. Prabhu T.J., "Design of Transmission Elements", Mani offset, Chennai, 2013
5. Darle W Dudley, "Hand Book of Practical Gear Design", CRC Press, Florida, 2015.
HAND BOOK
PSG, "Design Data Book", KalaikathirAchagam Publishers, 2011.