A coupling is a device 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 operation, however there are torque limiting couplings which can slide or disconnect when some torque limit is exceeded.
The primary purpose of couplings is to join two pieces of rotating equipment while permitting some degree 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 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 motor or mechanical program. It may be used for connecting two separate systems, such as a motor and a generator, or to restoration a connection within a single program. A rigid coupling may also be added between shafts to lessen shock and put on at the stage where the shafts meet.
When joining shafts within a machine, mechanics may choose between flexible and rigid couplings. While flexible units present some movement and present between your shafts, rigid couplings will be the most effective choice for precise alignment and protected hold. By specifically aligning the two shafts and holding them firmly set up, rigid couplings help maximize performance and raise the expected existence of the machine. These rigid couplings are available in two basic designs 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 diameter that’s equal in size to the shafts. The sleeve slips over the shafts so they meet in the middle of the coupling. A number of set screws can be tightened therefore they touch the very best of each shaft and hold them set up without passing all the way through the coupling.
Clamped or compression rigid couplings come in two parts and match together around the shafts to create a sleeve. They offer more flexibility than sleeved models, and can be used on shafts that are set in place. They often 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 created for weighty loads or industrial equipment. They consist of short sleeves surrounded by a perpendicular flange. One coupling is positioned on each shaft so the two flanges fall into line face to encounter. A number of screws or bolts may then be set up in the flanges to hold them collectively. Because of their size and durability, flanged systems can be utilized to bring shafts into alignment before they are joined up with together. Rigid couplings are utilized when precise shaft alignment is necessary; shaft misalignment will have an effect on the coupling’s performance as well as its life.
2. Flexible coupling flexible couplings are used to transmit torque in one shaft to some other when both shafts are somewhat misaligned. Versatile couplings can accommodate varying examples of misalignment up to 3° and some parallel misalignment. In addition, they may also be used for vibration damping or noise decrease.This coupling is utilized to safeguard 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 made to slide 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 divided 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 are as a result used where shafts already are positioned in precise lateral and angular alignment.
What are the benefits of flexible coupling?
Versatile couplings accomplish the objective of any coupling, but their advantageover rigid couplings is usually they accommodate the unavoidable misalignment between shafts in some machinery. Flexible couplings also enable a amount of axial movement between your coupled shafts as may occur due to thermal expansion.
What are the types of coupling?
What’s Coupling? Types of Shaft Couplings
Rigid Couplings.
Flexible or Compensating Couplings.
Clutches to are a type of Coupling – We will 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 gadgets used for connecting two shafts together and are divided into two groups: Rigid and Flexible. Both are utilized for the purpose of transmitting power, rigid couplings becoming more limited in applications in comparison with flexible couplings. Rigid couplings are utilized where shafts are already positioned in precise lateral and angular alignment. Their design does not allow for any misalignment between shafts, but are generally able to transmit even more power than flexible couplings. Versatile couplings are made 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.