What is a coupling?
Coupling | varieties, Advantages, Disadvantages, Applications
What is a coupling?
A coupling may be a machine that is employed to carry 2 rotating shafts along. it's a permanent joint, in contrast to clutch which may be disengaged on the need of operator.
With the assistance of couplings, we will able to} be part of 2 shafts that are desecrate, collinear or parallel (with tiny low distance).
Difference between clutch and coupling:
We all understand that a clutch (which is usually utilized in automobiles) is additionally used for connecting 2 rotating shafts however there's a basic distinction between a clutch and coupling. In clutch can|we are able to} disengage the rod at our will whenever we would like however in coupling it's unacceptable.
Practical example of coupling:
In our domestic electricity generator, we tend to see that a shaft is turned by associate degree engine by changing energy of fuel into energy. This rod of engine is then connected with the shaft of an electrical generator with the assistance of a coupling. and eventually, electrical|the electrical} generator converts energy of shaft into electric energy.
Here coupling is a crucial half that transmits rotating motion of engine shaft to electrical generator shaft.
Requirements of a decent coupling
It ought to be capable of transmission torsion from driving shaft to driven shaft
It ought to align the shafts properly
It ought to be able to dismantle for the aim of maintenance
It ought to give safety to man and machine just in case of coupling failure
Types of couplings
There area unit 2 varieties of couplings
Rigid coupling
Flexible coupling
A flexible coupling will accommodate a small placement between shafts (up to zero.5-degree angular placement and five millimeter axial placement) however a rigid coupling cannot tolerate any such misalignment.
Examples of rigid coupling muff coupling, clamp coupling, rigid projection coupling etc.
Example of versatile coupling is tired pin versatile coupling.
Difference between rigid and versatile couplings
Flexible coupling will accommodate a small placement between shafts however a rigid coupling cannot accommodate any placement
Flexible coupling will absorb shocks and vibrations however a rigid coupling cannot absorb shocks and vibrations
Rigid coupling is straightforward and cheap however versatile couplings area unit valuable
Some common varieties of couplings area unit mentioned below.
Muff coupling
A muff coupling is additionally called a sleeve or box coupling. it's a sort of rigid coupling. It consists a sleeve and a key that is employed to affix input and output shafts.
Advantages of muff coupling
It is easy, it's solely 2 elements a sleeve and a key
Since it's no protruding elements thus it's safe to use
It has compact construction
It is cheaper compared to alternative varieties of couplings
Disadvantages of muff coupling
It is troublesome to assemble or dismantle
Since it's a rigid coupling thus it cannot accommodate any placement
Due to absence of versatile components it cannot absorbs shocks and vibrations
It needs a lot of axial house compared with alternative varieties of couplings
Clamp coupling
It is conjointly called compression or split muff coupling. it's a sort of rigid coupling. it's same as muff coupling the sole distinction is in clamp coupling sleeve is split into 2 axially parallel elements. that area unit assembled along to make a coupling.
Advantages of clamp coupling
It is simple to assemble and dismantle
It is simple to get rid of while not axial displacement of any shaft
Its diametrical dimensions area unit tiny compared to muff coupling
Disadvantages of clamp coupling
Dynamic leveling is troublesome thus it's not appropriate for top speed applications
It is Not appropriate for shock hundreds
Necessary to supply a guard for safety
Rigid projection coupling
As the name suggests it's a rigid coupling. it's 2 flanges one on driving shaft and one on driven shaft. These 2 flanges area unit joined in conjunction with the assistance of nut and bolt.
Advantages of rigid projection coupling
It has High torsion transmission capability
It is simple to assemble and dismantle
It has easy construction and it's simple to style and manufacture
Disadvantages of rigid projection coupling
It cannot tolerate placement between shafts
It cannot used wherever shocks and vibrations area unit gift
It needs some radial house
Bushed pin versatile coupling
As the name suggests it's a sort of versatile coupling. It consists 2 flanges mounted every on input and output shaft. each the flanges area unit connected with rubber bush in between, that provides resistance to shocks and slight placement.
Advantages of tired pin versatile coupling
It will tolerate slight placement
It will work with shocks and vibrations
It will be used for transmission high torques
It is easy in construction
It will simply be assembled or destroyed
Disadvantages of tired pin versatile coupling
It has high price thanks to extra elements
It needs a lot of radial house compared with alternative varieties of couplings
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