couplings introduction

1. Design of Couplings

2. couplings are used to connect two shafts in such away that
when both shafts rotate, they act as one unit and transmit
power from one shaft to other
Shafts to be coupled may have collinear axes, intersecting
axes or parallel axes at a small distance.
Classification:
couplings are classified as
1. Rigid couplings
2. Flexible couplings
3. Loose or Disengaging couplings
4. Non- aligned couplings

3. Couplings are used in machinery for several purposes
To provide for the connection of shafts of units that are manufactured
separately such as a motor and generator and to provide for disconnection for
repairs or alternations.
To provide for misalignment of the shafts or to introduce mechanical
flexibility.
Toreduce the transmission of shock loads from one shaft to another.
Tointroduce protection against overloads.
It should have no projecting parts

4. Requirements of a Good Shaft Coupling
It should be easy to connect or disconnect.
It should transmit the full power from one shaft to the other
shaft without losses.
It should hold the shafts in perfect alignment.
It should reduce the transmission of shock loads from one shaft
to another shaft.
If should have no projecting parts.

5. Types of Shafts Couplings
1. Rigid coupling 2. Flexible coupling

6. Types of Shafts Couplings
Rigid coupling
It is used to connect two shafts which are perfectly aligned.
• types of rigid coupling are
• a)Sleeve or muff coupling.
• b)Clamp or split-muff or compression coupling,
• c)Flange coupling

7. Flexible coupling :
It is used to connect two shafts having both lateral and angular
misalignment.
Types of flexible coupling are
a)Bushed pin type coupling,
b)Universal coupling, and
c)Oldham coupling
Flexible coupling