A coupling is a gadget used for connecting two shafts jointly at their ends for the purpose of transmitting power.
Couplings usually do not normally allow disconnection of shafts during procedure, however there are torque limiting couplings which can 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 financial savings can be made in decreased maintenance costs and downtime.
3 main types of couplings:
1. Rigid coupling a rigid coupling is usually a unit of hardware used to become listed on two shafts within a motor or mechanical program. It might be used to connect two separate systems, such as a engine and a generator, or to restoration a connection within a single program. A rigid coupling can also be added between shafts to reduce shock and use at the point where the shafts meet.
When joining shafts within a machine, mechanics can choose between flexible and rigid couplings. While flexible units offer some movement and give between the shafts, rigid couplings are the most effective choice for exact alignment and protected hold. By specifically aligning the two shafts and holding them firmly in place, rigid couplings help maximize performance and increase the expected lifestyle of the device. These rigid couplings can be found in two basic designs to fit the requires of different applications. Sleeve-style couplings will be the least expensive and easiest to make use of. They consist of a single tube of material with an inner diameter that’s equal in size to the shafts. The sleeve slips over the shafts so they satisfy in the middle of the coupling. A series of set screws could be tightened so they touch the top of each shaft and hold them in place without passing all the way through the coupling.
Clamped or compression rigid couplings can be found 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 all the way through the coupling and into the second half to make sure a secure hold.
Flanged rigid couplings are made for weighty loads or commercial equipment. They contain short sleeves surrounded by a perpendicular flange. One coupling is positioned on each shaft so the two flanges fall into line face to face. A series of screws or bolts can then be installed in the flanges to hold them collectively. Because of their size and durability, flanged products can be used to provide shafts into alignment before they are joined up with jointly. Rigid couplings are utilized when precise shaft alignment is required; shaft misalignment will influence the coupling’s performance along with its life.
2. Flexible coupling versatile couplings are used to transmit torque from one shaft to some other when both shafts are slightly misaligned. Versatile couplings can accommodate varying levels of misalignment up to 3° and some parallel misalignment. Furthermore, they may also be used for vibration damping or noise reduction.This coupling is utilized to protect the driving and driven shaft members against harmful effects produce due to misalignment of the shafts, sudden shock loads, shaft expansion or vibrations etc.
3. Torque limiter coupling designed to slide the torque out from the shaft to prevent damage to the engine or the application

What is the difference between rigid coupling and flexible coupling?
Couplings are divided into groups: Rigid and Flexible. In comparison withflexible couplings, rigid couplings possess limited application. Rigid couplings do not have the capability to compensate for shaft misalignments and are consequently used where shafts already are positioned in precise lateral and angular alignment.
What are the benefits of flexible coupling?
Flexible couplings accomplish the purpose of any coupling, but their advantageover rigid couplings is they accommodate the unavoidable misalignment between shafts in a few machinery. Versatile couplings also enable a degree of axial movement between your coupled shafts as might occur due to thermal expansion.
What 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 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 gadgets used to connect two shafts together and so are divided into two categories: Rigid and Flexible. Both are used for the purpose of transmitting power, rigid couplings getting more limited in applications when compared with versatile couplings. Rigid couplings are used where shafts are already positioned in exact lateral and angular alignment. Their design does not allow for any misalignment between shafts, but are generally able to transmit even more power than versatile couplings. Flexible couplings are created to accommodate misalignment between shafts and various types of load conditions. Many styles and types of couplings are available. For successful coupling selection, application conditions must be clearly understood.