Coupling

A coupling is a device used to connect two shafts together at their ends for the purpose of transmitting power. Its main job is to join two pieces of rotating equipment while permitting some degree of misalignment, end movement or both. In a more general sense a coupling can be any mechanical device that connects the ends of adjacent parts or objects. Couplings do not normally allow the shafts to be disconnected during operation, although torque-limiting couplings can slip or disconnect once a set torque is exceeded. Careful selection, installation and maintenance of couplings can reduce maintenance time and maintenance cost.