What type of coupling is used to connect misaligned shafts?

Flexible couplings are specifically designed to connect misaligned shafts while accommodating some degree of angular, parallel, or axial misalignment. This is important in many applications where perfect alignment is not achievable due to manufacturing tolerances, thermal expansion, or movement during operation.

The ability of flexible couplings to absorb misalignment helps in reducing wear on machinery and prevents damage to both the connected shafts and other components in the system. These couplings often utilize materials or designs that can bend or flex, providing a cushion between the shafts and maintaining efficient operation without transmitting excessive forces.

In contrast, rigid couplings are not designed for misalignment and can lead to stress concentrations and possible failure if there is any misalignment. Gear couplings and chain couplings, while they do allow flexibility, are typically used for specific high-load applications or specific mechanical advantages but may not compensate as effectively for shaft misalignment as flexible couplings do.