A coupling is a device used to connect two shafts collectively at their ends for the purpose of transmitting power.
Couplings do not normally allow disconnection of shafts during operation, however right now there are torque limiting couplings that may slide or disconnect when some torque limit is exceeded.
The primary reason for couplings is to join two pieces of rotating equipment while permitting some degree of misalignment or end movement or both.
By cautious selection, installation and maintenance of couplings, substantial financial savings can be made in decreased maintenance costs and downtime.
3 primary types of couplings:
1. Rigid coupling a rigid coupling is a unit of equipment used to become listed on two shafts within a electric motor or mechanical system. It might be used for connecting two separate systems, such as a motor and a generator, or even to repair a connection within an individual system. A rigid coupling can 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 give some movement and give between your shafts, rigid couplings are the most effective choice for precise alignment and secure hold. By specifically aligning both shafts and holding them firmly in place, rigid couplings help to maximize performance and raise the expected lifestyle of the machine. These rigid couplings are available in two basic styles to fit the needs of different applications. Sleeve-style couplings are the least expensive and easiest to use. They consist of an individual tube of materials with an inner size that’s equal in proportions to the shafts. The sleeve slips over the shafts therefore they fulfill in the center of the coupling. A number of set screws can be tightened therefore they touch the very best of each shaft and keep them set up without passing completely 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 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 heavy loads or industrial equipment. They contain short sleeves surrounded by a perpendicular flange. One coupling is positioned on each shaft so the two flanges fall into line face to encounter. A series of screws or bolts may then be set up in the flanges to carry them together. Because of their size and durability, flanged devices can be used to bring shafts into alignment before they are joined up with collectively. Rigid couplings are utilized when specific shaft alignment is required; shaft misalignment will impact the coupling’s performance and also its life.
2. Flexible coupling versatile couplings are used to transmit torque in one shaft to another when both shafts are slightly misaligned. Flexible couplings can accommodate varying levels of misalignment up to 3° plus some parallel misalignment. Furthermore, they can also be used for vibration damping or noise reduction.This coupling is 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 harm to the engine or the application
What is the difference between rigid coupling and flexible coupling?
Couplings are split into categories: Rigid and Flexible. As compared withflexible couplings, rigid couplings possess limited program. Rigid couplings don’t have the capability to compensate for shaft misalignments and so are therefore used where shafts are already positioned in precise lateral and angular alignment.
What are the benefits of flexible coupling?
Versatile couplings accomplish the objective of any kind of coupling, but their advantageover rigid couplings is normally they accommodate the unavoidable misalignment between shafts in some machinery. Flexible couplings also enable a degree of axial movement between the coupled shafts as may occur because of thermal expansion.
What exactly are the types of coupling?
What’s Coupling? Types of Shaft Couplings
Rigid Couplings.
Versatile or Compensating Couplings.
Clutches to are a type 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 gadgets used to connect two shafts together and so are divided into two types: 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 are already positioned in precise lateral and angular alignment. Their design will not allow for any misalignment between shafts, but are usually able to transmit more power than versatile couplings. Flexible couplings are made to accommodate misalignment between shafts and different types of load circumstances. Many styles and types of couplings can be found. For successful coupling selection, application circumstances must be clearly understood.