A coupling is a gadget used for connecting two shafts jointly at their ends for the purpose of transmitting power.
Couplings usually do not normally allow disconnection of shafts during procedure, however 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 degree of misalignment or end motion or both.
By careful selection, installation and maintenance of couplings, substantial financial savings can be manufactured in decreased maintenance costs and downtime.
3 primary types of couplings:
1. Rigid coupling a rigid coupling can be a unit of equipment used to become listed on two shafts within a motor or mechanical program. It may be used to connect two separate systems, such as 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 lessen shock and put on at the point where the shafts meet.
When joining shafts within a machine, mechanics can choose between flexible and rigid couplings. While flexible units offer some movement and present between your shafts, rigid couplings are the most effective choice for specific alignment and protected hold. By specifically aligning the two shafts and keeping them firmly set up, rigid couplings help maximize performance and boost the expected lifestyle of the device. These rigid couplings can be found in two basic styles to fit the needs 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 proportions to the shafts. The sleeve slips over the shafts so they meet in the center of the coupling. A series of set screws can be tightened so they touch the top of every shaft and keep them in place without passing all the way through the coupling.
Clamped or compression rigid couplings can be found in two parts and suit together around the shafts to create a sleeve. They provide more versatility than sleeved versions, and can be used on shafts that are fixed in place. They generally are large enough to ensure that screws can pass all the way through the coupling and in to the second half to ensure a secure hold.
Flanged rigid couplings are created for weighty loads or commercial equipment. They contain short sleeves encircled by a perpendicular flange. One coupling is placed on each shaft therefore the two flanges fall into line face to encounter. A number of screws or bolts may then be installed in the flanges to carry them together. Because of their size and durability, flanged systems can be utilized to provide shafts into alignment before they are joined together. Rigid couplings are used when precise shaft alignment is required; shaft misalignment will affect the coupling’s performance in addition to its life.
2. Flexible coupling flexible couplings are accustomed to transmit torque in one shaft to some other when the two shafts are slightly misaligned. Flexible couplings can accommodate varying degrees of misalignment up to 3° plus some parallel misalignment. Furthermore, they may also be used for vibration damping or noise reduction.This coupling is utilized to protect 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 designed to slide the torque out of the shaft to prevent damage to the engine or the application
What is the difference between rigid coupling and flexible coupling?
Couplings are split into classes: Rigid and Flexible. As compared withflexible couplings, rigid couplings possess limited software. Rigid couplings don’t 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 advantages of flexible coupling?
Flexible couplings accomplish the objective of any kind of coupling, but their advantageover rigid couplings is normally they accommodate the unavoidable misalignment between shafts in a few machinery. Versatile couplings also enable a degree of axial movement between your coupled shafts as might occur due to 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 will 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 so are divided into two classes: Rigid and Flexible. Both are utilized for the objective of transmitting power, rigid couplings getting more limited in applications in comparison with flexible couplings. Rigid couplings are used where shafts are already 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. Versatile couplings are made to accommodate misalignment between shafts and various types of load conditions. Many styles and types of couplings are available. For effective coupling selection, application circumstances must be clearly understood.