A coupling is a gadget used to connect two shafts together at their ends for the purpose of transmitting power.
Couplings do not normally allow disconnection of shafts during operation, however there are torque limiting couplings that may slip or disconnect when some torque limit is exceeded.
The primary purpose of couplings is to become listed on two bits of rotating equipment while permitting some extent of misalignment or end motion or both.
By cautious selection, installation and maintenance of couplings, substantial savings can be manufactured in reduced maintenance costs and downtime.
3 primary types of couplings:
1. Rigid coupling a rigid coupling is usually a unit of hardware used to join two shafts within a motor or mechanical system. It might be used to connect two separate systems, like a engine and a generator, or even to fix a connection within an individual program. A rigid coupling may also be added between shafts to reduce shock and use at the main point where the shafts meet.
When joining shafts within a machine, mechanics may choose between flexible and rigid couplings. While flexible units offer some movement and present between your shafts, rigid couplings will be the most reliable choice for precise alignment and secure hold. By specifically aligning both shafts and holding them firmly in place, rigid couplings help to maximize performance and boost the expected life of the machine. These rigid couplings are available in two basic styles to fit the requires of different applications. Sleeve-style couplings are the most affordable and easiest to use. They consist of an individual tube of material with an inner size that’s equal in size to the shafts. The sleeve slips over the shafts therefore they satisfy in the center of the coupling. A series of set screws could be tightened therefore they touch the top of every shaft and keep them set up without passing completely the coupling.
Clamped or compression rigid couplings come in two parts and fit together around the shafts to create a sleeve. They provide more flexibility than sleeved models, and can be used on shafts that are fixed in place. They generally are large enough so that screws can move completely the coupling and in to the second half to ensure a secure hold.
Flanged rigid couplings are made for large loads or industrial equipment. They contain short sleeves surrounded by a perpendicular flange. One coupling is placed on each shaft so the two flanges line up face to face. A number of screws or bolts can then be installed in the flanges to hold them collectively. Because of their size and durability, flanged systems can be used to provide shafts into alignment before they are joined up with together. Rigid couplings are used when precise shaft alignment is necessary; shaft misalignment will have an effect on the coupling’s performance in addition to its life.
2. Flexible coupling versatile couplings are accustomed to transmit torque in one shaft to another when both shafts are slightly misaligned. Flexible couplings can accommodate varying examples of misalignment up to 3° plus some parallel misalignment. Furthermore, they may also be utilized for vibration damping or noise reduction.This coupling is 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 from the shaft to prevent harm to the engine or the application form

What is the difference between rigid coupling and flexible coupling?
Couplings are divided into categories: Rigid and Flexible. As compared withflexible couplings, rigid couplings have got limited application. Rigid couplings do not have the capability to compensate for shaft misalignments and are therefore used where shafts are already positioned in precise 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 certainly they accommodate the unavoidable misalignment between shafts in a few machinery. Flexible couplings also allow for a degree of axial movement between the coupled shafts as may occur due to thermal expansion.
What exactly are the types of coupling?
What is Coupling? Types of Shaft Couplings
Rigid Couplings.
Flexible or Compensating Couplings.
Clutches to certainly 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 products used for connecting two shafts together and are divided into two types: Rigid and Flexible. Both are used for the purpose of transmitting power, rigid couplings being more limited in applications as compared to flexible couplings. Rigid couplings are used where shafts already are positioned in exact lateral and angular alignment. Their design will not enable any misalignment between shafts, but are usually able to transmit even more power than flexible couplings. Flexible couplings are created to accommodate misalignment between shafts and different types of load circumstances. Many styles and types of couplings are available. For effective coupling selection, application circumstances should be clearly understood.