Shaft Coupling

Shaft is the connecting rod which is used to transmit the power driven by the motor or the engine. Shaft Coupling Shafts are usually available up to 7 meters length due to inconvenience in transport. In order to have a greater length, it becomes necessary to join two or more pieces of the shaft by means of a coupling.
Shaft couplings are used in machinery for several purposes, that are given below following :

Figure : 1. Shaft Coupling

1.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.
2. To provide for misalignment of the shafts or to introduce mechanical flexibility.
3. To reduce the transmission of shock loads from one shaft to another.
4. To introduce protection against overloads.
5. It should have no projecting parts.

Note : A coupling is termed as a device used to make permanent or semi-permanent connection where as a clutch permits rapid connection or disconnection at the will of the operator.

Figure :- 2. Fitted Shaft coupling

Requirements of a Good Shaft Coupling A good shaft coupling should have the following requirements :

1. It should be easy to connect or disconnect.
2. It should transmit the full power from one shaft to the other shaft without losses.
3. It should hold the shafts in perfect alignment.
4. It should reduce the transmission of shock loads from one shaft to another shaft.
5. It should have no projecting parts.

Types of Shafts Couplings Shaft couplings are divided into two main groups as follows :

1. Rigid coupling.
It is used to connect two shafts which are perfectly aligned.
Following types of rigid coupling are important from the subject point of view :
(a) Sleeve or muff coupling.
(b) Clamp or split-muff or compression coupling, and
(c) Flange coupling. 

2. Flexible coupling.
It is used to connect two shafts having both lateral and angular misalignment.
Following types of flexible coupling are important from the subject point of view :
(a) Bushed pin type coupling,
(b) Universal coupling, and
(c) Oldham coupling.

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