What is the function of a rigid coupling?

A rigid coupling is designed to connect two shafts that are perfectly aligned, creating a solid, continuous connection between them. This type of coupling transmits torque directly and efficiently, ensuring that power is transferred without any flexibility or gaps that could lead to inefficiencies. When the shafts are properly aligned, a rigid coupling provides robust support and is useful in applications where high precision is necessary.

While some couplings allow for misalignment or provide flexibility to accommodate slight misalignments, rigid couplings are specifically intended for applications where both shafts are aligned, making them unsuitable for compensating for any angular or parallel misalignment. Additionally, while they can reduce vibration to some degree simply due to their solid construction, their primary function is to connect shafts effectively when perfect alignment is achieved.