What is coupling?

A coupling is a device that is used to connect two shafts together for power transmission. Couplings are rigid or flexible according to the alignment accuracy and torque requirement.

What is shaft coupling?

The shaft coupling is a mechanical component that connects two rotating shafts such as the driving shaft and driven shaft for purpose of transmitting power. It is used in motors, pumps, generators, and compressors.

How does a Shaft Coupling Work?

You can connect two shafts together by coupling as shown in the above diagram. No problem if the shaft diameter is different.

As per the above diagram, the motor is the driving side, and the propeller is driven side.

The coupling does not transfer the heat etc. of the motor to the driven side.

Coupling absorbers the shock and vibration from transferring, this will help to protect surrounding components from damage.

Why Shaft Coupling is Used?

Following are some of the most common reasons why shaft coupling is used:

1. Used to connect shafts of units that are manufactured separately such as a motor and generator.
2. For the misalignment of the shafts.
3. For mechanical flexibility.
4. Absorbs the transmission of shock loads from one shaft to another shaft.
5. Protection against overloads.

Types of Coupling

Following are the different types of coupling:

1. Rigid Coupling
2. Sleeve or muff coupling.
3. Clamp or split-muff or compression coupling, and
4. Flange coupling
5. Flexible coupling
6. Bushed pin-type coupling,
7. Universal coupling
   
8. Oldham coupling
9. Gear coupling
10. Bellow coupling
11. Jaw couplings
12. Diaphragm couplings
13. Fluid Coupling
14. Constant speed coupling
15. Variable speed coupling