types and uses of coupling
In order to connect two shafts to transmit power, we use COUPLINGS.
They conjointly offer some finish movement or placement for flexibility and guarantee simple disconnection of the 2 separate devices for repairs and maintenance. They protect against overloads, reduce the shock that is transmitted from one shaft to another and can also alter the amount of vibration a rotating unit experiences.
There are various types of coupling but the two most common types are rigid and flexible couplings.
Rigid couplings don't have the flexibility to make amends for shaft misalignments and square measure thus used wherever shafts square measure already positioned in precise lateral and angular alignment. The rigid coupling transmits not solely the motion from the motive force (typically an electrical motor) to the rotating part of the instrumentation however any axial movement (up or down) that happens between the 2 items of apparatus is additionally transmitted between them.
The flexible coupling also works on the basis of holding two shafts together, however, they allow more flexibility of the shafts. They are wont to transmit torsion if the shafts happen to be misaligned.
One factor to recollect is that once subjected to placement and torsion, all couplings react on the connected equipment components. Some produce greater reactionary forces than others and if overlooked, can cause shaft failures, bearing failures, and other failures of equipment components. They may also excite vibrations with time-varying reactions. This last point usually receives less attention.
Successful coupling choice needs a transparent understanding of application conditions. The major factors governing the coupling choice square measure given below.
- Torque and power rating
- Shaft misalignment
- Lateral and axial flexibility of couplings
- Torsional flexibility
- Rotational velocity error
- Service conditions