A shaft coupling is a device used to join two piece of rotating equipment or shaft for the purpose of transmitting power from one shaft to another shaft.
They are also used for several purposes, the common of which are following:
- To provide for the connection of shafts of units that are manufactured separately such as motor and gearbox and to provide for disconnection for repair.
- To provide for misalignment of the shafts or to introduce mechanical flexibility.
- To reduce the transmission of shock loads from one shaft to another.
- To introduce protection against overloads.
Types Of Shaft Coupling
1. Rigid Coupling
They are used to connect two shafts which are perfectly aligned.
Types of Rigid Coupling
(b) Flange Coupling
(c) Clamp or split muff or compression coupling
2. Flexible Coupling
They are used to connect two shafts having lateral and angular misalignment.
Types of Flexible Coupling
(a) Bushed pin type coupling
(b) Oldham Coupling
(c) Universal Coupling
(d) Gear Coupling
(e) Tyre Coupling
(f) Jaw Coupling
(g) Bellow Coupling
3. Fluid Coupling or Hydraulic Coupling
They are used to transmit power from one shaft to another shaft by means of acceleration and deceleration of hydraulic fluid.
Types of Fluid Coupling
(a) Constant Speed Type Fluid Coupling
(b) Variable Speed Type Fluid Coupling
Requirements Of A Good Shaft Coupling
- It should be easy to connect or disconnect.
- It should transmit the full power from one shaft to other shaft without losses.
- It should hold the shaft in perfect alignment.
- It should reduce transmission of shock loads.
- It should have no projecting parts.
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