RIGID SHAFT COUPLINGS

A rigid coupling is a mechanical device used to connect two shafts together in applications where precise shaft alignment is required. A rigid shaft coupling is designed to transmit torque without allowing for misalignment or movement between connected shafts, making it ideal for systems that require high accuracy, stable power transmission, and equipment shaft / impeller to be supported by coupling.

Rigid couplings are commonly used in vertical equipment where equipment shaft / impeller weight needs to be supported and aligned by coupling. These couplings are often found in pumps, mixers, turbines, and other rotating equipment applications that have two bearings in the equipment train.

Common types of rigid couplings include sleeve couplings, clamp or split couplings, and flanged couplings. Flanged couplings that provide radial piloted fits will ensure tighter alignment between equipment shafts compared to those that don’t and clamp type couplings, flanged couplings with external adjustment holes also remove impeller positioning headaches seen with other types during installation.

The main difference between a rigid coupling and a flexible coupling is the ability to accommodate misalignment. A rigid shaft coupling aligns and supports shaft but does not absorb vibration or shaft movement thus pushing any such load directly to equipment bearings. Flexible couplings, on the other hand, are designed to compensate for angular, parallel and axial misalignment while also helping reduce vibration and shock loads within rotating equipment systems.