What is a Coupling, Why do we need coupling, Things To Know About Coupling
23 Sep, 2020

Do you want to know what is coupling? In physics, when objects are interacting with each other is generally termed as coupled. When one fundamental force transmits the energy and strengths to another form mounted at a point, is known as a couple. In general, we can say that it is the part of a machine, by which the power is generally transmitted from the drive side to the driven side. Simply you can call it a joint. The two shafts are usually mounted together at a point (the shafts may be of different diameter), where the driver side transmit power to the driven side.

Necessities of Coupling or Shaft Fitting

Fitting of a shaft requires maintaining four aspects. These aspects are power transmission, mounting error-free, absorption of vibration, and does not produce heat. The coupling can be cost-effective, noise-reducing, minimizing energy consumption. For example, in a car, the driving shaft is from the engine and it transmits its power to a different portion of the car.

Things To Know About Coupling

The perfect coupling or the jointing portion should be mounting error-free, vibration-free, and does not produce heat while working. Do you want to have a clear idea about shaft fitting or coupling? Then go through these following points.

Power Transmission:

Machines are generally designed to perform a designated work that needs different sections. It is quite difficult to design a machine having various sections with a single shaft. Does it easier to transport a huge machine instead of carrying the machine separated into different parts? The answer is no. This is the main reason why engineers designed a machine to couple with various portions to transmit power with the drive shaft. Now, it is quite easier to transport the machine easily in any place.

Misalignment During Assembling:

Having an idea of what is coupling, you can call it the alignment between two parts, the drive part, and the driven part. Sometimes excessive forces lead to increase friction, vibration, and failure of shafts. This is a high precision job to align drive-shaft to driven shaft. Misalignment produces noise, vibration, and generates heat during rotation. Though the power transmits dynamically and accurately, there may be eccentricity, axial displacement, declination angle between two shafts due to misalignment.

Minimum Generation Of Heat While Working:

We all know that the generation of heat only occurs when there is work done. Having a strong idea about what is coupling, you can easily minimize the extra heat produce at the point of coupling. Sometimes, using a coupling prevents the heat transferred from one portion to another portion. Therefore, knowing what is coupling prevents the transmission of heat from the machine for deforming or shifting the shaft of other portions.

Protection From Vibration While Working:

When you know what is coupling, you can have a clear conception about the vibration of the machine. We all know that the vibration and shock produced from coupling are usually transferred to the different portions of a machine when it is in use. So, to eliminate this, you need to consult with experts. When the driving and driven shafts are perfectly aligned, it absorbs shocks or vibration produced in the machine.

Why do we need couplings?

Coupling is mandatory to transmit power from driving shaft to driven shaft. This power can easily be transmitted with the help of countless gear arrangements only when the shafts are parallel. Apart from that, when the shafts are in a parallel line and connected parallelly to transmit power couplings are used.

Some common requirements of coupling:

  • To curtail shock loads transmission from one shaft to other utilizing ductile couplings.
  • To couple or connect two separately manufactured components. For example, generator and output motor shaft.
  • To introduce supreme protection against overloads.
  • To introduce additional malleability when transmitting power in case of space limitation.


Well, that’s all about couplings! We have diligently summed up what is a coupling and its various aspects. Therefore, you see various performances required for coupling such as vibration absorption, high rigidity, flexibility, and high precision. However, if you find this useful, please comment down below! Help your friends by sharing this coupling blog as it is the perfect combination of all the vital knowledge. Last but not least, sharing is caring!

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