Unit iv power transmissions systems pulleys

UNIT – IV
POWER TRANSMISSIONS SYSTEMS, PULLEYS : Transmission of power by belt and rope drives,
transmission efficiencies, belts – flat and v types – ropes - pulleys for belt and rope drives, materials,
chain drives
DESIGN OF POWER SCREWS: Design of screw, square ACME, buttress screws, design of nut,
compound screw, differential screw, ball screw- possible failures.
SPUR & HELICAL GEAR DRIVES: Spur gears- helical gears – load concentration factor – dynamic
load factor, surface compressive strength – bending strength – design analysis of spur gears – estimation
of centre distance, module and face width, check for plastic deformation, check for dynamic and wear
considerations.
UNIT – V
MACHINE TOOL ELEMENTS: Levers and brackets: design of levers – hand levers-foot lever –
cranked lever – lever of a lever loaded safety valve- rocker arm straight – angular- design of a crank pin –

B. Tech (MECHANICAL ENGINEERING) - R20
UNIVERSITY COLLEGE OF ENGINEERING VIZIANAGARAM
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY: KAKINADA
brackets- hangers- wall boxes.
Wire Ropes: Construction, Designation, Stresses in wire ropes, rope sheaves and drums.
Note: Design data book is permitted for examination
Text Books:
1. Machine Design/V.Bandari/TMH Publishers
2. Machine Design/ NC Pandya & CS Shaw/ Charotar publishers
3. Design data book.
References:
1. Machine Design: An integrated Approach / R.L. Norton / Pearson Education
2. Mech. Engg. Design / JE Shigley/Tata McGraw Hill education
3. Design of machine elements- spots/Pearson Publications
4. Machine Design-Norton/Pearson Publications
Course Outcomes:
Upon successful completion of this course the student should be able to:
1. Select the suitable bearings based on the application of the loads and predict the life of the bearing
(BL-3)
2. Interpret engine parts such as connecting rod, crank, crank shaft and engine parts such as piston,
cylinder and cylinder liners (BL-2)
3. Analyze curved beams with various cross sections and crane hooks (BL-4)
4. Analyze power transmission elements such as belts, chains, ropes.power screws and gear drives(BL-4)
5. Interpret machine tool elements such as levers and brackets (BL-2)
CO-PO Mapping:
S.NO PO1 PO2 PO3 PO4 PO5 PO6 PO7 PO8 PO9 PO10 PO11 PO12
CO1
√ √ √ √ √ √
CO2 √ √ √ √ √ √
CO3
√ √ √ √ √ √
CO4 √ √ √ √ √ √
CO5
√ √ √ √ √ √

B. Tech (MECHANICAL ENGINEERING) - R20
UNIVERSITY COLLEGE OF ENGINEERING VIZIANAGARAM
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY: KAKINADA
III Year-II Semester
L T P C
3 0 0 3
DYNAMICS OF MACHINERY (R203203PC03)
Course Objectives:
The Students will acquire the knowledge
1. To analyze stabilization of sea vehicles, aircrafts and automobile vehicles
2. To solve frictional losses, torque transmission of mechanical systems.
3. To analyze dynamic forces of slider crank mechanism and design of flywheel
4. To understand the methods of balancing reciprocating and rotary masses.