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Couplings Calculus A.L.A. Mech. Div. - A C. K. Pithawala College of Engineering & Technology


GROUP – A7 Name Roll Number Enrolment Number Patel Brijesh 122 160090119058 Desai Jainish 123 160090119011 Tankariya Hardik 126 160090119117 Pathak Aloknath 131 160090119085 Lalluwadia Yash 135 160090119039 Patil Fenil 466 160094107002


Coupling A coupling is a device used to connect two shafts together at their ends for the purpose of transmitting power. Couplings do not normally allow disconnection of shafts during operation. The primary purpose of couplings is to join two pieces of rotating equipment.

Types Of Coupling :

Types Of Coupling

Rigid Coupling:

Rigid Coupling Rigid couplings are used when precise shaft alignment is required Simple in design and are more rugged Generally able to transmit more power than flexible couplings Shaft misalignments cannot be compensated

Sleeve or Muff coupling:

Sleeve or Muff coupling A sleeve coupling consists of a pipe whose bore is finished to the required tolerance based on the shaft size . Based on the usage of the coupling a keyway is made in the bore in order to transmit the torque by means of the key . Two threaded holes are provided in order to lock the coupling in position.

Flange Coupling:

Flange Coupling This coupling has two separate stainless steel /cast iron flanges. Each flange is mounted on the shaft end and keyed to it. The two flanges are coupled together with the help of bolts and nuts. The projected portion of one of the flanges and corresponding recess on the other flange help to bring the shaft into line and to maintain alignment . A flange which is provided with a shroud which shelters the bolts heads and nuts is called protected type flange coupling.

Flexible Coupling:

Flexible Coupling A flexible coupling permits with in certain limits, relative rotation and variation in the alignment of shafts. Pins (Bolts) covered by rubber washer or bush is used connect flanges with nuts. The rubber washers or bushes act as a shock absorbers and insulators. Bushed Pin Type Flange

Oldham’s Coupling :

Oldham’s Coupling An Oldham coupling has three discs, one coupled to the input, one coupled to output, & a middle disc that is joined to the first two by tongue & groove. The tongue and groove on one side is perpendicular to the tongue and groove on the other. The middle disc rotates around its centre at the same speed as the input and output shafts. Often springs are used to reduce backlash of the mechanism. An advantage to this type of coupling, as compared to two universal joints, is its compact size.

Comparison Between Oldham’s Coupling & Flange Coupling :

Comparison Between Oldham’s Coupling & Flange Coupling Oldham’s Coupling   Oldham coupling has three discs one coupled to the input, one coupled to output, & a middle disc It is more effective than Flange coupling Flange Coupling This coupling has two separate stainless steel /cast iron flanges It is not that much king of effective that of Oldham

Some Other Type Of Coupling.:

Some Other Type Of Coupling. HRC :The HRC is a general purpose Flexible coupling available in eight sizes in taper bush style or pilot bore. Gear :With the capacity of handling heavy loads, gear couplings are much smaller and lighter than other types of couplings. Noise and vibrations are hardly produced even in high speed operation Universal Joints : High degree of shaft misalignment at low torque.

Uses of coupling:

Uses of coupling To provide connection of shafts of units made separately To allow misalignment of the shafts or to introduce mechanical flexibility. To reduce the transmission of shock loads To introduce protection against overloads. To alter the vibration characteristics

Application Of Coupling:

Application Of Coupling There are some following application of coupling , they are as follow :- To provide for the connection of shafts of units. To reduce the transmission of shock loads from one shaft to another. To introduce protection against overloads. To connect driving and the driven part. To transfer power one end to another end.

Alignment  Of Coupling:

Alignment  Of Coupling It should be easy to connect or disconnect the coupling. It does allow some misalignment between the two adjacent shaft rotation axes. Its goal should be to minimise the remaining misalignment in running operation so as to maximise power transmission and to maximise machine runtime. It should have no projecting parts. It is recommended to use manufacturer's alignment target values to set up the machine train to a defined non-zero alignment, due to the fact that later, when the machine is at operation temperature, the alignment condition is perfect.

Coupling Maintenance & Failure :

Coupling Maintenance & Failure Performing visual inspections, checking for signs of wear or fatigue, and cleaning couplings regularly . Checking and changing lubricant regularly if the coupling is lubricated. This maintenance is required annually for most couplings and more frequently for couplings in adverse environments or in demanding operating conditions . Documenting the maintenance performed on each coupling, along with the date . The only way to improve coupling life is to understand what caused the failure and to correct it prior to installing a new coupling. Some external signs that indicate potential coupling failure include :- Abnormal noise, such as screeching, squealing or chattering Excessive vibration or wobble Failed seals indicated by lubricant leakage or contamination .

Advantage Of Coupling:

Advantage Of Coupling Many machine builders are well aware of the advantages of using configurable components in the design stages . Specifications often change and builders must adapt components to fit new constraints. Drive and electrical components must be flexible to adapt to new operating parameters or machine chassis dimensions . Circuit breakers, fuses, and power supplies can be easily changed out in the event that a different motor or sensor is installed . Finding direct drive couplings with compact dimensions and creative mounting configurations is normally fairly easy. 

Disadvantage Of Coupling:

Disadvantage Of Coupling One of the disadvantages of using a shaft coupling is the possibility and effects of misaligning the shafts, then attaching a coupling. Coupling Shafts can vibrate during rotation. All types of couplings can loosen over their work life. Many times mechanics will use a correcting coupling if they anticipate misalignment or excessive vibration.

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