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 consist 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 imprecise manufacturing and installation, deformation during operation, or thermal expansion (including axial, radial, angular, or combined misalignments); as well as mitigate shock and absorb vibration.

Common couplings are generally standardized or specified. Typically, it's just a matter of selecting the correct type of coupling, determining the model and size. In case of necessity, load capacity calculations for the vulnerable weak points can be performed; at high rotational speeds, centrifugal forces on the outer edge and deformation of elastic elements must be verified, along with balance checks.

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