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 there are torque limiting couplings that may 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 degree of misalignment or end movement or both.
By careful selection, installation and maintenance of couplings, substantial financial savings can be made 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 electric motor or mechanical system. It could be used to connect two separate systems, like a motor and a generator, or even to repair a connection within a single system. A rigid coupling may also be added between shafts to reduce shock and use at the point where the shafts meet.
When joining shafts within a machine, mechanics may select from flexible and rigid couplings. While flexible units give some movement and give between the shafts, rigid couplings are the most reliable choice for specific alignment and protected hold. By precisely aligning the two shafts and keeping them firmly set up, rigid couplings help to maximize performance and raise the expected life of the device. These rigid couplings can be found in two basic designs to fit the demands of different applications. Sleeve-style couplings will be the least expensive and easiest to make use of. They consist of a single tube of material with an inner diameter that’s equal in proportions to the shafts. The sleeve 
slips over the shafts so they meet in the middle of the coupling. A number of set screws could be tightened so 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 suit together around the shafts to form a sleeve. They offer more versatility than sleeved versions, and can be used on shafts that are set in place. They generally are large enough so that screws can move all the way through the coupling and into the second half to make sure a secure hold.
Flanged rigid couplings are designed for weighty loads or industrial equipment. They consist of short sleeves encircled by a perpendicular flange. One coupling is placed on each shaft therefore the two flanges line up face to encounter. A number of screws or bolts can then be set up in the flanges to hold them jointly. Because of the size and durability, flanged units can be used to provide shafts into alignment before they are joined jointly. Rigid couplings are used when exact shaft alignment is required; shaft misalignment will have an effect on the coupling’s performance as well as its life.
2. Flexible coupling versatile couplings are used to transmit torque from one shaft to another when the two shafts are somewhat misaligned. Versatile couplings can accommodate varying levels of misalignment up to 3° plus some parallel misalignment. Furthermore, they can also be utilized for vibration damping or sound reduction.This coupling is utilized to protect 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 from 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. As compared withflexible couplings, rigid couplings have got limited program. Rigid couplings don’t have the ability to compensate for shaft misalignments and are therefore used where shafts are already positioned in precise lateral and angular alignment.
What are the advantages of flexible coupling?
Versatile couplings accomplish the purpose of any kind of coupling, but their advantageover rigid couplings is 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 due to thermal expansion.
What exactly 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 will the dealing 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 products used to connect two shafts together and are divided into two categories: Rigid and Flexible. Both are utilized for the purpose of transmitting power, rigid couplings getting even more limited in applications as compared to versatile couplings. Rigid couplings are used where shafts already are positioned in precise lateral and angular alignment. Their design will not allow for any misalignment between shafts, but are generally able to transmit more power than flexible couplings. Flexible couplings are created to accommodate misalignment between shafts and various types of load circumstances. Many designs and types of couplings can be found. For successful coupling selection, application conditions must be clearly understood.