A coupling is a mechanical device used to connect two shafts together end-to-end for the purpose of transmitting power . Its primary function is to transmit torque from a driving shaft (e.g., from a motor or engine) to a driven shaft (e.g., on a pump or gearbox) . Couplings are essential components in nearly all rotating machinery, enabling the efficient transfer of mechanical energy.
Primary Functions
Beyond simply connecting shafts, couplings serve several critical functions in a power transmission system:
Power Transmission: The fundamental job is to transmit rotational power and torque from one shaft to another .
Compensate for Misalignment: It is extremely difficult and expensive to achieve perfect alignment between two shafts. Couplings accommodate minor amounts of angular, parallel (offset), or axial misalignment, preventing undue stress on shafts, bearings, and other components .
Absorb Shocks and Vibrations: Certain types of couplings can dampen torsional vibrations and absor…