A coupling is a device used to connect two shafts jointly at their ends for the purpose of transmitting power.
Couplings usually do not normally allow disconnection of shafts during procedure, however right now there are torque limiting couplings which can 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 movement or both.
By careful selection, installation and maintenance of couplings, substantial financial savings can be manufactured in reduced maintenance costs and downtime.
3 primary types of couplings:
1. Rigid coupling a rigid coupling is a unit of equipment used to become listed on two shafts within a engine or mechanical program. It might be used to connect two separate systems, like a motor and a generator, or to repair a connection within an individual system. A rigid coupling may also be added between shafts to reduce shock and put on at the stage where the shafts meet.
When joining shafts within a machine, mechanics can select from flexible and rigid couplings. While flexible units offer some movement and give between your shafts, rigid couplings are the most effective choice for specific alignment and secure hold. By exactly aligning both shafts and keeping them firmly in place, rigid couplings help maximize performance and increase the expected life of the device. These rigid couplings are available in two basic styles to fit the demands of different applications. Sleeve-style couplings are the least expensive and easiest to use. They consist of a single tube of materials with an inner diameter that’s equal in proportions to the shafts. The sleeve slips over the shafts so they satisfy in the center of the coupling. A series of set screws could be tightened so they touch the very best of every shaft and hold 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 offer more flexibility than sleeved versions, and can be utilized on shafts that are set in place. They often are large enough so that screws can pass all the way through the coupling and in to the second half to make sure a secure hold.
Flanged rigid couplings are made for large loads or commercial equipment. They consist of short sleeves surrounded by a perpendicular flange. One coupling is positioned on each shaft so the two flanges line up face to face. A number of screws or bolts may then be set up in the flanges to carry them together. Because of their size and durability, flanged models can be used to provide shafts into alignment before they are joined up with together. Rigid couplings are utilized when specific shaft alignment is required; shaft misalignment will have an effect on 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 the two shafts are slightly misaligned. Versatile couplings can accommodate varying degrees of misalignment up to 3° plus some parallel misalignment. In addition, they may also be used for vibration damping or sound decrease.This coupling can be used to protect 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 designed to slide the torque out of the shaft to prevent damage to the engine or the application

What’s the difference between rigid coupling and flexible coupling?
Couplings are divided into groups: Rigid and Flexible. As compared withflexible couplings, rigid couplings have got limited application. Rigid couplings don’t have the capability to compensate for shaft misalignments and are as a result used where shafts are already positioned in specific lateral and angular alignment.
What are the advantages of flexible coupling?
Versatile couplings accomplish the purpose of any coupling, but their advantageover rigid couplings is they accommodate the unavoidable misalignment between shafts in some machinery. Flexible couplings also enable a degree of axial movement between your coupled shafts as might occur because of thermal expansion.
What 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 dealing on them separately.
Flanged Pin Bush Couplings.
Bibbly Coupling.
Gear Tooth Coupling.
Tyre couplings.
Elastomeric Couplings – This consists of jaw type and S-flex couplings.
Couplings are products used for connecting two shafts together and are divided into two classes: Rigid and Flexible. Both are used for the objective of transmitting power, rigid couplings getting more limited in applications when compared with versatile couplings. Rigid couplings are used where shafts already are positioned in precise lateral and angular alignment. Their design does not allow for any misalignment between shafts, but are usually able to transmit more power than flexible couplings. Flexible couplings are made to accommodate misalignment between shafts and different types of load conditions. Many designs and types of couplings are available. For successful coupling selection, application circumstances must be clearly understood.