A coupling is a device used to connect two shafts jointly at their ends for the intended purpose of transmitting power.
Couplings usually 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 manufactured in reduced maintenance costs and downtime.
3 primary types of couplings:
1. Rigid coupling a rigid coupling is definitely a unit of hardware used to become listed on two shafts within a engine or mechanical system. It could be used for connecting two separate systems, such as a electric motor and a generator, or even to restoration a connection within an individual system. A rigid coupling may also be added between shafts to lessen shock and wear at the point where the shafts meet.
When joining shafts within a machine, mechanics may choose between flexible and rigid couplings. While flexible units present some movement and give between the shafts, rigid couplings will be the most reliable choice for exact alignment and secure hold. By specifically aligning both shafts and holding them firmly set up, rigid couplings help to maximize performance and increase the expected life of the machine. These rigid couplings are available in two basic styles to fit the needs of different applications. Sleeve-style couplings are 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 every shaft and keep them set up without passing all the way through the coupling.
Clamped or compression rigid couplings can be found in two parts and fit together around the shafts to form a sleeve. They offer more versatility than sleeved versions, and can be utilized on shafts that are set in place. They generally are large enough so that screws can pass all the way through the coupling and in to the second half to make sure a secure hold.
Flanged rigid couplings are designed for large loads or commercial equipment. They consist of short sleeves surrounded by a perpendicular flange. One coupling is positioned on each shaft therefore the two flanges fall into line face to face. A number of screws or bolts can then be installed in the flanges to carry them collectively. Because of the size and durability, flanged devices can be utilized to bring shafts into alignment before they are joined up with jointly. Rigid couplings are utilized when precise shaft alignment is required; shaft misalignment will impact the coupling’s performance in addition to its life.
2. Flexible coupling flexible couplings are used to transmit torque from one shaft to another when both shafts are somewhat 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 is used 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 designed 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 split into classes: Rigid and Flexible. In comparison withflexible couplings, rigid couplings have got limited application. Rigid couplings 
do not have the ability to compensate for shaft misalignments and so are as a result used where shafts already are positioned in exact lateral and angular alignment.
What are the advantages of flexible coupling?
Versatile couplings accomplish the objective of any kind of coupling, but their advantageover rigid couplings is certainly they accommodate the unavoidable misalignment between shafts in some machinery. Flexible couplings also enable a amount of axial movement between your 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 for connecting two shafts together and are divided into two types: Rigid and Flexible. Both are used for the purpose of transmitting power, rigid couplings getting even more limited in applications when compared with versatile couplings. Rigid couplings are utilized where shafts are already positioned in specific lateral and angular alignment. Their design will not enable any misalignment between shafts, but are usually able to transmit more power than flexible couplings. Versatile couplings are designed to accommodate misalignment between shafts and various types of load circumstances. Many styles and types of couplings can be found. For successful coupling selection, application conditions should be clearly understood.
