This document outlines the design of various mechanical components and systems across four units: Unit I covers stresses in beams and joints, including riveted and welded joints. Design of shafts is also covered, considering twisting, bending and combined loads. Unit II includes the design of knuckle joints, springs, power screws, and screw threads. Unit III focuses on shaft design based on rigidity and the design of couplings, sleeves, muff couplings, and flexible couplings. Unit IV addresses the design of bearings, journal bearings, and internal combustion engine parts like connecting rods and flywheels.

1. • Unit I :
• (A) Meaning of design, Phases of design,
Simple stresses, Thermal stresses, Impact
Stress, Torsional stress, bending stresses in
straight & curved beams, it’s applications,
Hooks, C-clamps.

2. Unit I :
• (B) Rivetted Joints- Design, failures, strength &
efficiency of riveted joint.
• (C) Welded Joint- Strength, of transverse &
parallel fillet welded section

3. UNIT -II
• (A) Design of knuckle joint.
• (B) Design of spiral & leaf spring.
• (C) Design of power screw- Torque required to
raise loads, efficiency & helix angle,
overhauling & self locking of screw, ACME
threads, stresses in power screws. (12)

4. Unit III
• :
• (A) Design of Shaft – Subjected to twisting,
bending & combined twisting & bending
loads, based on rigidity.
• (B) Design of coupling, rigid coupling, sleeve,
muff coupling, flange coupling & flexible
coupling

5. Unit IV :
• (A) Antifriction bearing: Types of bearing,
construction, life of bearings, selection of
bearings.
• (B) Journal bearing: Lubrication, selection of
lubrication, design procedure & numerical.
• (C) Design of IC Engine parts: Connecting rod,
design of flywheel based on TM diagram

7. Unit I
1. Shaft
1. Design on the basis of strength considering
shaft subjected to twisting moment only &
bending moment only
2. Combine twisting and bending moment
3. Design on the basis of rigidity

8. 2.Design of Key

9. What is a Key?
• A key is a piece of mild steel inserted
between the shaft and hub or boss of the
pulley to connect these together in order to
prevent relative motion between them.
• It is always inserted parallel to the axis of the
shaft.
• Keys are used as temporary fastenings and
are subjected to considerable crushing and
shearing stresses.
• A keyway is a slot or recess in a shaft and
hub of the pulley to accommodate a key.

10. Types of Keys
1. Sunk keys
2. Saddle keys
3. Tangent keys,
4. Round keys
5. Splines.