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What are the advantages and disadvantages of flexible coupling?
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What are the advantages and disadvantages of flexible coupling?

Views:0     Author:Site Editor     Publish Time: 2021-05-03      Origin:Site

A flexible coupling is mainly designed to hold a pipe connection tightly. Generally, these components of flexible coupling come with clamp and edges as features. The clamp can be either of steel or any other material that can easily resist corrosion. According to the requirement, manufacturers offer different kinds of flexible couplings. Some sturdy as well as advanced flexible couplings can be used easily with aggressive chemicals.


  • What are the differences between rigid coupling and flexible coupling?

  • What are the advantages and disadvantages of flexible coupling?

  • How flexible coupling can be used in daily life?


What are the differences between rigid coupling and flexible coupling?

Rigid shaft coupling cannot compensate for the axial displacement and radial displacement between the connecting transmission shafts. The rigid coupling is suitable for two shafts with good concentricity.

Flexible shaft coupling can compensate for the axial displacement and radial displacement between the connecting shafts. Flexible coupling is suitable for the situation where the concentricity of the two shafts is not very good, and the situation with torsional vibration to reduce vibration.

The main difference between rigid couplings and flexible couplings is the connection. Rigid coupling provides a rigid connection, that is, two shafts are firmly connected, and the coupling can transmit torque smoothly in the entire system. A flexible coupling can form a flexible connection, and the components may lose some torque through interaction.

  • Alignment Requirements: Flexible couplings can handle slightly misaligned shafts. Rigid couplings are torsional stiff and can’t tolerate any misalignment. This applies to both shafts that are physically misaligned at rest and parts that may cause misalignment during operation due to thermal changes.

  • Backlash: Rigid couplings, especially newer models of aluminum rigid couplings, can significantly reduce backlash to at-zero or near-zero levels. Flexible couplings don’t offer the same protection.

  • Maintenance Requirements: Because rigid couplings are stiff, they do not absorb vibrations, which can lead to early wear on parts that aren’t properly aligned. Operators should routinely check rigid couplings for wear and alignment, and they should also routinely apply lubricant. Flexible couplings can handle vibration and shock without adverse wear.

  • Complexity: Flexible couplings often have more components and are more complex. This can make operation and maintenance more complicated. Rigid couplings are simpler and more straightforward.

  • Applications: Flexible couplings can be used in servos with low or moderate torque levels and the potential for shaft misalignment. This includes applications such as machining tools, semiconductor manufacturing, and packaging equipment. Rigid couplings work best for high-torque requirements, shaft support applications, and push-pull use cases.

  • Cost: Rigid couplings are more affordable than flexible couplings, which tend to have a high cost.



What are the advantages and disadvantages of flexible coupling?


1.      Flexible coupling is one-piece metal elastomer, which is simple in construction. Therefore, flexible coupling can easily be assembled or dismantled.

2.      Flexible coupling has zero backlash and can perform synchronous operation.

3.      Flexible coupling has elastic action compensates radial, angular and axial deviations.

4.      Flexible coupling is high torque rigidity and excellent sensitivity, which is used for transmitting high torques.

5.      Characteristic of flexible coupling is that clockwise and counterclockwise rotation are exactly the same.

6.      Flexible coupling is maintenance-free, oil and corrosion resistance.

7.      There are aluminum alloy and stainless-steel materials for selection of flexile coupling.

8.      Flexible coupling can tolerate slight misalignment by working with shocks and vibrations.



Flexible coupling has high cost due to additional parts.

Flexible coupling requires more radial space compared with other types of couplings

The possibility and effects of misaligning the shafts, then attaching a shaft coupling. The rigid coupling damages the components more than other types of shaft couplings when misalignment occurs, but all shaft couplings will cause some damage. Even a slight misalignment will create excessive force on the coupling, shaft and bearings, causing them to wear prematurely.

Shafts can vibrate during rotation. The vibration can loosen the flexible coupling preventing the rotation between shafts from remaining constant. A loosened flexible coupling will cause one shaft to turn faster than the other creating other problems, such as worn components or slow gear speed.

The use of flexible couplings, such as a leaf spring coupling, can cause a loss of velocity between shafts. The loss of velocity will influence the position of the shafts. Along with a loss of velocity, the shaft vibration will increase, causing the premature wearing of bearings and gears. You will also get more drive noise when the shafts are rotating.

Mechanics will use a correcting shaft coupling if they anticipate misalignment or excessive vibration. The correcting shaft coupling works fine to decrease the damage of these shaft problems but over time will create more problems. New correcting shaft couplings have gaps that will correct any misalignment and vibration between shafts, but over time, these gaps will increase. As the gaps increase, more backlash develops between shafts. The backlash places more pressure and torque on the couplings, as well as the motor, bearings and gears. You will begin to hear a loud slapping noise when this backlash problem develops.

All types of shaft couplings can loosen over their work life. The shaft couplings are a wearable component and slowly loosen under normal operating conditions. Once the shaft coupling begins to loosen, the velocity, drive speed, alignment and vibration between shafts will be harmed or damaged. All of these problems create major damage to the other components. A good periodic maintenance inspection can catch this disadvantage of using shaft couplings before the problem develops into an extreme defect.


How flexible coupling can be used in daily life?

Flexible rubber coupling is suitable for the transmission of small and medium power water pumps with high speed, high rigidity of the installation base, high centering accuracy, low impact load, and low vibration reduction requirements.

One of the high-review couplings, gear coupling is of enormous use in material apparatus, scoops, draglines, air blowers, blowers and fans. The explicit element of this sort of flexible coupling is that it gives a high torque weight proportion. High torque of gear coupling clears a path for little couplings and gives better yield. Gear coupling’s huge bore limit permits littler and less expensive couplings. Gear coupling is exchangeable, in this manner diminishing burden on the rigging network and expanding the center quality.

Typical applications of universal joints include aircraft, electrical appliances, control mechanisms, electronic equipment, instrumentation, medical and optical equipment, ordnance, radios, sewing machines, textile machinery and tool drives. The universal joint can be made of steel or thermoplastic. Under a given size, steel universal joints have the greatest load-bearing capacity. Universal joints with thermoplastic body parts are used in light industrial applications. Its self-lubricating properties, light weight, negligible recoil, corrosion resistance and high-speed running capabilities are significant advantages. Spherical universal joints are used for high-speed operation and transmission of large torque.


Learn more something about flexible couplings can know the features of flexible coupling and the differences between rigid couplings and flexible couplings. If you want to buy good shaft couplings with reasonable price, FOSHAN HOUZHE TRANSMISSION EQUIPMENT CO., LTD. is your best choice.




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