Different Types of Coupling Explained
Types of coupling & their uses
universal joints are used on each end. One
at the end of the propeller shaft to the gearbox and one on the
differential to another end.
Universal coupling is also used for the transmission of power to
different spindles of multiple drilling machine and milling machine
8 Oldham Coupling
Oldham coupling used where two shafts have a lateral misalignment. The below figure
shows the schematic diagram of Oldham coupling. As a figure, it consists of two
flanges A and B with slots and a middle floating part E with two tongues T1 and T2.
The middle part is fixed by means of pins that are fitted to
flanges and floating parts. The T1 tongue fits into flange A allowing back and
forth motion and T2 is fitted into flange B and allows for vertical motion of the parts.
These two components of speed will result in the lateral
misalignment of the shaft being adjusted as they rotate.
9 Gear Coupling
The gear coupling is a modified version of the flange coupling.
Gear couplings can transmit high torque because of the large size of the teeth.
In these types of shaft coupling, the flange and hub are separately assembled together instead of as a single part as flange coupling.
Gear Coupling In construction, each joint has a ration of 1:1 internal and external gear pair. And gear coupling is limited to angular misalignments about0.01-0.02 inches in parallel and 2 degrees in angular.
Gear couplings and universal joints are used for similar
applications. These are mostly used in heavy-duty applications where the torque
transmission is required to be high.
10 Bellow Coupling
Bellows couplings are flexible coupling with twin coupling ends
Different Types of Coupling Explained
These couplings have excellent torsional rigidity to accurately
transmit velocity, angular position, and torque. They are usually made of stainless steel. These couplings are used where high precision positioning is required.
Bellows
coupling consists of thin walls and has minor flexibility angular, axial, or parallel misalignment. The hubs are welded to the coupling
11 Jaw coupling
This coupling is used for general purpose power transmission it
is also used in motion control applications. Jaw coupling is designed to transmit torque while reducing system vibrations and adjusting misalignment, which protects other components from damage.
Jaw coupling consists of two metallic hubs and an Elastoplast
insert called an element, also known as “spider”.
Following are the advantages of Jaw Coupling:
This system can handle angular misalignment and reactionary loads due to misalignment.
Has a good torque to outside diameter capability.
Good chemical resistance and decent dampening capability.
12 Diaphragm Couplings
Diaphragm couplings are one of the nonlubricated couplings used
in high-performance turbomachinery, transmitting torque and serving
misalignment between equipment shafts.
This type of coupling transmits torque from the outside to
inside diameter, and then from inside diameter to outside diameter.
Diaphragm couplings use a single or a series of plates for the
flexible members. Diaphragm coupling allows angular, axial, or parallel
misalignment. This coupling is used where high torque and high speed are required.
13 Fluid Coupling Fluid coupling is also known as hydraulic coupling. It is a hydrodynamic device used to transmit rotating mechanical power through the acceleration and deceleration of hydraulic fluid. It is consisting of an impeller on the driving shaft (input) and a runner on the driven shaft (output).The impeller acts as a pump
In the impeller near its axis, the tangential component of absolute velocity is low. where on its near periphery the tangential component of absolute velocity is high, therefore when the impeller accelerates the fluid velocity increases.
An increase in velocity also increases kinetic energy. The fluid
emerges at high velocity from the impeller, strikes the runner blades,
transfers its energy, and leaves the runner at low velocity.