A coupling is a device used for connecting 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 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 join two pieces of rotating equipment while permitting some degree of misalignment or end motion or both.
By cautious selection, installation and maintenance of couplings, substantial financial savings can be manufactured in decreased maintenance costs and downtime.
3 main types of couplings:
1. Rigid coupling a rigid coupling is a unit of equipment used to join two shafts within a engine or mechanical program. It might be used for connecting two separate systems, like a electric motor and a generator, or to fix a connection within a single system. A rigid coupling can also be added between shafts to lessen shock and wear 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 reliable choice for exact alignment and protected hold. By exactly aligning the two shafts and keeping 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 styles to fit the desires of different applications. Sleeve-style couplings are the least expensive and easiest to use. They consist of a single tube of material with an inner size that’s equal in proportions to the shafts. The sleeve slips over the shafts so they fulfill in the middle of the coupling. A number of set screws could be tightened therefore they touch the very best of every shaft and hold them set up without passing completely the coupling.
Clamped or compression rigid couplings come in two parts and match together around the shafts to create a sleeve. They provide more versatility than sleeved versions, and can be utilized on shafts that are fixed in place. They often are large enough so that screws can pass completely the coupling and in to the second half to make sure a secure hold.
Flanged rigid couplings are made for weighty loads or commercial equipment. They consist of short sleeves encircled by a perpendicular flange. One coupling is positioned on each shaft therefore the two flanges fall into line face to face. A series of screws or bolts can then be set up in the flanges to hold them jointly. Because of their size and durability, flanged products can be utilized to provide shafts into alignment before they are joined up with collectively. Rigid couplings are utilized when specific shaft alignment is required; shaft misalignment will affect the coupling’s performance as well as its life.
2. Flexible coupling flexible couplings are used to transmit torque from one shaft to some other when both shafts are slightly misaligned. Flexible couplings can accommodate varying examples of misalignment up to 3° plus some parallel misalignment. Furthermore, they can also be used for vibration damping or noise reduction.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 designed to slip the torque out of the shaft to prevent harm to the engine or the application

What is the difference between rigid coupling and flexible coupling?
Couplings are split into classes: Rigid and Flexible. In comparison withflexible couplings, rigid couplings have got limited application. Rigid couplings do not have the capability to compensate for shaft misalignments and so are as a result used where shafts are already positioned in precise lateral and angular alignment.
What are the benefits of flexible coupling?
Versatile couplings accomplish the purpose of any kind of coupling, but their advantageover rigid couplings is normally they accommodate the unavoidable misalignment between shafts in some machinery. Versatile couplings also allow for a amount 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 are a type of Coupling – We will the working on them separately.
Flanged Pin Bush Couplings.
Bibbly Coupling.
Gear Tooth Coupling.
Tyre couplings.
Elastomeric Couplings – This includes jaw type and S-flex couplings.
Couplings are gadgets used for connecting two shafts together and so are divided into two groups: Rigid and Flexible. Both are used for the objective of transmitting power, rigid couplings becoming even more limited in applications in comparison with flexible couplings. Rigid couplings are utilized where shafts already are positioned in specific lateral and angular alignment. Their design does not enable any misalignment between shafts, but are generally able to transmit more power than versatile couplings. Versatile couplings are designed 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.