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

Most commonly used couplings are standardized or dimensioned, typically requiring only the correct selection of the coupling type, determination of the model and size. In case of necessity, load capacity checks can be performed on the vulnerable weak points. When operating at high speeds, calculations for centrifugal force on the outer periphery and deformation of the elastic elements are necessary, along with balance verification.

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