A coupling is a gadget used to connect two shafts collectively at their ends for the intended purpose of transmitting power.
Couplings usually do not normally allow disconnection of shafts during procedure, however there are torque limiting couplings which can slide 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 definitely a unit of hardware used to join two shafts within a engine or mechanical program. It may be used to connect two separate systems, like a engine and a generator, or to repair a connection within an individual system. A rigid coupling can also be added between shafts to lessen shock and put on at the point 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 present between your shafts, rigid couplings are the most effective choice for precise alignment and secure hold. By specifically aligning both shafts and holding them firmly set up, rigid couplings help to maximize performance and raise the expected life of the machine. These rigid couplings can be found in two basic designs to fit the demands of different applications. Sleeve-style couplings are the least expensive and easiest to make use of. They consist of a single tube of materials with an inner size that’s equal in size to the shafts. The sleeve slips over the shafts therefore they meet in the center of the coupling. A number of set screws could be tightened therefore they touch the top of every shaft and hold them set up without passing all the way through the coupling.
Clamped or compression rigid couplings can be found in two parts and suit together around the shafts to form a sleeve. They offer more flexibility than sleeved versions, and can be utilized on shafts that are set in place. They often are large enough to ensure that screws can move all the way through the coupling and in to the second half to ensure a secure hold.
Flanged rigid couplings are created 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 fall into line face to face. A number of screws or bolts may then be set up in the flanges to hold them jointly. Because of the size and durability, flanged systems can be used to provide shafts into alignment before they are joined up with collectively. Rigid couplings are used when specific shaft alignment is required; shaft misalignment will impact the coupling’s performance along with 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. Versatile couplings can accommodate varying examples of misalignment up to 3° plus some parallel misalignment. Furthermore, they can 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 of the shaft to prevent damage to the engine or the application form
What’s the difference between rigid coupling and flexible coupling?
Couplings are divided into classes: Rigid and Flexible. As compared withflexible couplings, rigid couplings have got limited application. Rigid couplings don’t have the ability to compensate for shaft misalignments and are therefore used where shafts already are positioned in precise lateral and angular alignment.
What are the benefits of flexible coupling?
Flexible couplings accomplish the objective of any kind of 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 amount of axial movement between your coupled shafts as might occur due to thermal expansion.
What are the types of coupling?
What’s Coupling? Types of Shaft Couplings
Rigid Couplings.
Versatile or Compensating Couplings.
Clutches to are a kind of Coupling – We can the dealing 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 to connect two shafts together and are divided into two groups: Rigid and Flexible. Both are used for the purpose of transmitting power, rigid couplings being more limited in applications in comparison with flexible couplings. Rigid couplings are used where shafts already are positioned in exact lateral and angular alignment. Their design does not allow for any misalignment between shafts, but are usually able to transmit more power than versatile couplings. Versatile couplings are made to accommodate misalignment between shafts and various types of load circumstances. Many designs and types of couplings are available. For effective coupling selection, application circumstances must be clearly understood.