A coupling is a gadget used for connecting two shafts together at their ends for the intended purpose of transmitting power.
Couplings usually do not normally allow disconnection of shafts during operation, however right now there are torque limiting couplings that may slip or disconnect when some torque limit is exceeded.
The primary reason for couplings is to join two bits of rotating equipment while permitting some extent of misalignment or end movement or both.
By cautious selection, installation and maintenance of couplings, substantial savings can be made in reduced maintenance costs and downtime.
3 main types of couplings:
1. Rigid coupling a rigid coupling is certainly a unit of hardware used to become listed on two shafts within a engine or mechanical system. It might be used for connecting two separate systems, such as a electric motor and a generator, or to restoration a connection within a single program. A rigid coupling can also be added between shafts to lessen shock and wear at the stage where the shafts meet.
When joining shafts within a machine, mechanics may select from flexible and rigid couplings. While flexible units present some movement and give between the shafts, rigid couplings are the most effective choice for exact alignment and protected hold. By precisely aligning the two shafts and keeping them firmly in place, rigid couplings help to maximize performance and boost the expected existence of the machine. These rigid couplings are available in two basic styles to fit the needs of different applications. Sleeve-style couplings will be the least expensive and easiest to use. They consist of a single tube of materials with an inner diameter that’s equal in size to the shafts. The sleeve slips over the shafts therefore they fulfill in the middle of the coupling. A number of set screws could be tightened therefore they touch the very best of every shaft and keep them in place without passing completely the coupling.
Clamped or compression rigid couplings come in two parts and suit together around the shafts to form a sleeve. They provide more flexibility than sleeved models, and can be used on shafts that are set in place. They generally are large enough to ensure that screws can move completely the coupling and in to the second half to make sure a secure hold.
Flanged rigid couplings are made for heavy loads or commercial equipment. They contain short sleeves encircled by a perpendicular flange. One coupling is positioned on each shaft so the two flanges line up face to encounter. A number of screws or bolts may then be set up in the flanges to hold them together. Because of the size and durability, flanged devices can be used to provide shafts into alignment before they are joined collectively. Rigid couplings are used when exact shaft alignment is necessary; shaft misalignment will have an effect on the coupling’s performance and also its life.
2. Flexible coupling flexible couplings are accustomed to transmit torque from one shaft to some other when the two shafts are somewhat misaligned. Flexible couplings can accommodate varying degrees of misalignment up to 3° plus some parallel misalignment. Furthermore, they can also be utilized for vibration damping or sound reduction.This coupling can be used to safeguard the driving and driven shaft members against harmful effects produce because of misalignment of the shafts, sudden shock loads, shaft expansion or vibrations etc.
3. Torque limiter coupling made to slip the torque out of the shaft to prevent harm to the engine or the application form

What is the difference between rigid coupling and flexible coupling?
Couplings are split into classes: Rigid and Flexible. As compared withflexible couplings, rigid couplings have limited application. Rigid couplings do not have the ability to compensate for shaft misalignments and so are consequently used where shafts are already positioned in specific lateral and angular alignment.
What are the advantages of flexible coupling?
Flexible couplings accomplish the objective of any coupling, but their advantageover rigid couplings is usually they accommodate the unavoidable misalignment between shafts in a few machinery. Versatile couplings also allow for a amount of axial movement between your coupled shafts as may occur because of thermal expansion.
What exactly are the types of coupling?
What is Coupling? Types of Shaft Couplings
Rigid Couplings.
Versatile or Compensating Couplings.
Clutches to are a kind of Coupling – We can the working on them separately.
Flanged Pin Bush Couplings.
Bibbly Coupling.
Gear Tooth Coupling.
Tyre couplings.
Elastomeric Couplings – This contains jaw type and S-flex couplings.
Couplings are devices used to connect two shafts together and are divided into two groups: Rigid and Flexible. Both are utilized for the purpose of transmitting power, rigid couplings becoming even more limited in applications when compared with versatile couplings. Rigid couplings are utilized where shafts are already positioned in specific lateral and angular alignment. Their design does not enable any misalignment between shafts, but are generally able to transmit even more power than versatile couplings. Versatile couplings are designed to accommodate misalignment between shafts and different types of load circumstances. Many designs and types of couplings can be found. For successful coupling selection, application conditions must be clearly understood.