A coupling is a device used for connecting two shafts together at their ends for the purpose of transmitting power.
Couplings usually do not normally allow disconnection of shafts during operation, however right now there are torque limiting couplings that may slide or disconnect when some torque limit is exceeded.
The primary reason for 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 made in decreased maintenance costs and downtime.
3 primary types of couplings:
1. Rigid coupling a rigid coupling is normally a unit of hardware used to become listed on two shafts within a engine or mechanical system. It may be used for connecting two separate systems, like a motor and a generator, or to repair a connection within an individual program. A rigid coupling can also be added between shafts to lessen shock and use at the stage where the shafts meet.
When joining shafts within a machine, mechanics may select from flexible and rigid couplings. While flexible units offer some movement and present between your shafts, rigid couplings will be the most reliable choice for specific alignment and protected hold. By precisely aligning both shafts and holding them firmly in place, rigid couplings help maximize performance and boost the expected lifestyle of the device. These rigid couplings can be found in two basic styles to fit the needs of different applications. Sleeve-style couplings will be the least expensive and easiest to use. They consist of a single tube of materials with an inner diameter that’s equal in size to the shafts. The sleeve slips over the shafts therefore they meet in the center of the coupling. A series of set screws could be tightened therefore they touch the very best of every shaft and keep them set up 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 models, and can be utilized on shafts that are set in place. They generally are large enough so that screws can pass completely the coupling and in to the second half to ensure a secure hold.
Flanged rigid couplings are created for heavy loads or industrial equipment. They consist of short sleeves encircled by a perpendicular flange. One coupling is placed on each shaft so the two flanges fall into line face to encounter. A number of screws or bolts can then be set up in the flanges to carry them jointly. Because of their size and durability, flanged systems can be utilized to provide shafts into alignment before they are joined up with together. Rigid couplings are utilized when precise shaft alignment is necessary; shaft misalignment will impact the coupling’s performance as well as its life.
2. Flexible coupling flexible couplings are accustomed to transmit torque from one shaft to another when both shafts are slightly misaligned. Flexible couplings can accommodate varying degrees of misalignment up to 3° and some parallel misalignment. Furthermore, they may also be used for vibration damping or noise decrease.This coupling can be 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 slide the torque out of the shaft to prevent damage to the engine or the application form

What is the difference between rigid coupling and flexible coupling?
Couplings are split into groups: Rigid and Flexible. In comparison withflexible couplings, rigid couplings have got limited software. Rigid couplings don’t have the capability to compensate for shaft misalignments and so are consequently used where shafts already are positioned in precise lateral and angular alignment.
What are the advantages of flexible coupling?
Versatile couplings accomplish the objective of any coupling, but their advantageover rigid couplings is certainly they accommodate the unavoidable misalignment between shafts in some machinery. Versatile couplings also allow for a degree of axial movement between your coupled shafts as may occur because of thermal expansion.
What exactly are the types of coupling?
What’s Coupling? Types of Shaft Couplings
Rigid Couplings.
Versatile or Compensating Couplings.
Clutches to certainly are a kind of Coupling – We can the coping 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 devices used to connect two shafts together and so are divided into two types: Rigid and Flexible. Both are utilized for the purpose of transmitting power, rigid couplings becoming more limited in applications as compared to flexible couplings. Rigid couplings are utilized 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 even more power than versatile couplings. Versatile couplings are created 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 should be clearly understood.