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 which can slip or disconnect when some torque limit is exceeded.
The primary purpose of couplings is to join two bits of rotating equipment while permitting some extent of misalignment or end motion 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 a unit of equipment used to join two shafts within a electric motor or mechanical program. It may be used for connecting two separate systems, like a engine and a generator, or even to repair a connection within a single system. A rigid coupling can 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 choose between flexible and rigid couplings. While flexible units present some movement and give between the shafts, rigid couplings are the most reliable choice for specific alignment and secure hold. By specifically aligning the two shafts and keeping them firmly in place, rigid couplings help to maximize performance and boost the expected life of the machine. These rigid couplings are available in two basic designs to fit the wants of different applications. Sleeve-style couplings will be the most affordable 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 therefore they fulfill in the middle of the coupling. A series of set screws could be tightened therefore they touch the very best of each shaft and hold them in place without passing all the way through the coupling.
Clamped or compression rigid couplings come in two parts and suit together around the shafts to form a sleeve. They offer more versatility than sleeved models, and can be used on shafts that are fixed in place. They generally are large enough so that screws can pass all the way through the coupling and into the second half to make sure a secure hold.
Flanged rigid couplings are created for heavy loads or industrial equipment. They consist of short sleeves surrounded by a perpendicular flange. One coupling is placed on each shaft so the two flanges fall into line face to face. A series of screws or bolts may then be set up in the flanges to hold them collectively. Because of the size and durability, flanged devices can be utilized to bring shafts into alignment before they are joined up with together. Rigid couplings are used when precise shaft alignment is required; shaft misalignment will affect the coupling’s performance and also its life.
2. Flexible coupling flexible couplings are accustomed to transmit torque from one shaft to some other when both shafts are somewhat misaligned. Versatile couplings can accommodate varying degrees of misalignment up to 3° and some parallel misalignment. Furthermore, they may also be utilized 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’s the difference between rigid coupling and flexible coupling?
Couplings are divided into types: Rigid and Flexible. As compared withflexible couplings, rigid couplings have got limited application. Rigid couplings do not have the ability to compensate for shaft misalignments and are consequently used where shafts already are positioned in precise lateral and angular alignment.
What are the advantages of flexible coupling?
Flexible couplings accomplish the objective of any kind of coupling, but their advantageover rigid couplings is 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 are the types of coupling?
What is Coupling? Types of Shaft Couplings
Rigid Couplings.
Flexible or Compensating Couplings.
Clutches to 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 includes jaw type and S-flex couplings.
Couplings are gadgets used for connecting two shafts together and are divided into two categories: Rigid and Flexible. Both are used for the objective of transmitting power, rigid couplings becoming even more limited in applications when compared with flexible couplings. Rigid couplings are utilized where shafts already are positioned in exact lateral and angular alignment. Their design will not allow for any misalignment between shafts, but are generally able to transmit more power than versatile couplings. Flexible couplings are made to accommodate misalignment between shafts and different types of load conditions. Many styles and types of couplings can be found. For successful coupling selection, application conditions must be clearly understood.