couplings, also known as couplings, are mechanical components used to firmly connect the driving and driven shafts of different mechanisms, allowing them to rotate together and transmit motion and torque. They are also sometimes used to connect shafts to other parts (such as gears, pulleys, etc.). Typically, they are composed of two halves, connected by keys or tight fits, secured at both ends of the shafts, and then joined together in some manner. Couplings can compensate for misalignments between the shafts due to manufacturing and installation inaccuracies, deformation during operation, or thermal expansion (including axial, radial, angular, or combined misalignments); as well as mitigate shock and absorb vibration.

Most commonly used couplings are standardized or specified, generally requiring only the correct selection of the coupling type, confirmation of the model and size. In cases of necessity, a load capacity check calculation can be performed on the vulnerable weak points. At high rotational speeds, centrifugal force on the outer edge and deformation of the elastic elements should be verified, as well as balance checks conducted.

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