A coupling is a gadget used for connecting two shafts jointly at their ends for the purpose of transmitting power.
Couplings do not normally allow disconnection of shafts during operation, however there are torque limiting couplings which can slide or disconnect when some torque limit is exceeded.
The primary reason for couplings is to become listed on 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 savings can be made in reduced maintenance costs and downtime.
3 primary types of couplings:
1. Rigid coupling a rigid coupling is a unit of equipment used to join two shafts within a motor or mechanical system. It might be used to connect two separate systems, such as a engine and a generator, or even to repair a connection within a single system. A rigid coupling can also be added between shafts to reduce shock and use at the main point where the shafts meet.
When joining shafts within a machine, mechanics can select from flexible and rigid couplings. While flexible units offer some movement and present between the shafts, rigid couplings will be the most effective choice for precise alignment and secure hold. By exactly aligning the two shafts and keeping them firmly in place, rigid couplings help maximize performance and raise the expected lifestyle of the machine. These rigid couplings are available in two basic designs to fit the wants of different applications. Sleeve-style couplings will be the least expensive and easiest to use. They consist of a single tube of materials with an inner size that’s equal in size to the shafts. The sleeve slips over the shafts therefore they meet 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 in place 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 flexibility than sleeved versions, and can be utilized on shafts that are fixed in place. They often are 
large enough so that screws can pass completely the coupling and into the second half to ensure a secure hold.
Flanged rigid couplings are made for weighty loads or industrial equipment. They contain short sleeves encircled by a perpendicular flange. One coupling is placed on each shaft therefore the two flanges line up face to face. A number of screws or bolts can then be installed in the flanges to carry them together. Because of the size and durability, flanged models can be used to provide shafts into alignment before they are joined collectively. Rigid couplings are used when specific shaft alignment is necessary; shaft misalignment will affect the coupling’s performance along with its life.
2. Flexible coupling flexible couplings are accustomed to transmit torque in one shaft to another when the two shafts are somewhat misaligned. Flexible couplings can accommodate varying levels of misalignment up to 3° and some parallel misalignment. In addition, they can also be utilized for vibration damping or sound decrease.This coupling can be used 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 from the shaft to prevent harm to the engine or the application form
What’s the difference between rigid coupling and flexible coupling?
Couplings are divided into groups: Rigid and Flexible. In comparison withflexible couplings, rigid couplings possess limited program. Rigid couplings do not have the ability to compensate for shaft misalignments and are consequently used where shafts already are positioned in precise lateral and angular alignment.
What are the benefits of flexible coupling?
Flexible couplings accomplish the objective of any coupling, but their advantageover rigid couplings is usually they accommodate the unavoidable misalignment between shafts in a few machinery. Versatile couplings also enable a degree of axial movement between the coupled shafts as may occur due to thermal expansion.
What are the types of coupling?
What’s Coupling? Types of Shaft Couplings
Rigid Couplings.
Versatile or Compensating Couplings.
Clutches to certainly 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 consists of jaw type and S-flex couplings.
Couplings are devices used to connect two shafts together and are divided into two classes: Rigid and Flexible. Both are used for the objective of transmitting power, rigid couplings becoming more limited in applications as compared to versatile couplings. Rigid couplings are used where shafts are already positioned in exact lateral and angular alignment. Their design will not allow for any misalignment between shafts, but are generally able to transmit more power than versatile couplings. Flexible couplings are created to accommodate misalignment between shafts and different types of load conditions. Many designs and types of couplings are available. For effective coupling selection, application conditions should be clearly understood.
