A coupling is a gadget used to connect two shafts together at their ends for the purpose of transmitting power.
Couplings 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 degree of misalignment or end movement or both.
By cautious selection, installation and maintenance of couplings, substantial savings can be made in decreased maintenance costs and downtime.
3 main types of couplings:
1. Rigid coupling a rigid coupling is normally a unit of hardware used to join two shafts within a motor or mechanical system. It could be used for connecting two separate systems, like a engine and a generator, or even to fix a connection within a single system. A rigid coupling may also be added between shafts to reduce shock and put on at the main point where the shafts meet.
When joining shafts within a machine, mechanics may choose between flexible and rigid couplings. While flexible units offer some movement and give between the shafts, rigid couplings will be the most effective choice for exact alignment and secure hold. By specifically aligning the two shafts and keeping them firmly set up, rigid couplings help to maximize performance and boost the expected existence of the machine. These rigid couplings can be found in two basic designs to fit the wants of different applications. Sleeve-style couplings will be the most affordable and easiest to make use of. They consist of a single tube of material with an inner diameter that’s equal in size to the shafts. The sleeve slips over the shafts therefore they meet in the middle of the coupling. A number of set screws can be tightened therefore they touch the top of each shaft and hold them in place without passing completely the coupling.
Clamped or compression rigid couplings come in two parts and fit together around the shafts to create a sleeve. They provide more flexibility than sleeved models, 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 into the second half to ensure a secure hold.
Flanged rigid couplings are made for heavy loads or industrial equipment. They contain short sleeves surrounded by a perpendicular flange. One coupling is placed on each shaft so the two flanges line up face to face. A series of screws or bolts may then be installed in the flanges to carry them jointly. Because of their size and durability, flanged units can be used to bring shafts into alignment before they are joined collectively. Rigid couplings are utilized when precise shaft alignment is required; shaft misalignment will affect the coupling’s performance as well as its life.
2. Flexible coupling versatile couplings are accustomed to transmit torque in one shaft to another when both shafts are slightly misaligned. Versatile couplings can accommodate varying degrees of misalignment up to 3° plus some parallel misalignment. In addition, they can also be used for vibration damping or noise reduction.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

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 limited program. Rigid couplings do not have the capability to compensate for shaft misalignments and so are consequently used where shafts are already positioned in exact lateral and angular alignment.
What are the benefits of flexible coupling?
Versatile couplings accomplish the purpose of any coupling, but their advantageover rigid couplings is definitely they accommodate the unavoidable misalignment between shafts in a few machinery. Flexible couplings also allow for a degree of axial movement between the 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 will the dealing 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 groups: Rigid and Flexible. Both are utilized for the purpose of transmitting power, rigid couplings being more limited in applications as compared to versatile couplings. Rigid couplings are utilized where shafts already are positioned in exact lateral and angular alignment. Their design will not enable any misalignment between shafts, but are generally able to transmit more power than flexible couplings. Flexible couplings are made to accommodate misalignment between shafts and different types of load circumstances. Many styles and types of couplings are available. For successful coupling selection, application conditions should be clearly understood.