Flexible Gear Coupling vs Rigid Coupling — Comparison
A flexible gear coupling accommodates angular, parallel, and axial shaft misalignment while transmitting high torque, making it suitable for most industrial drives. A rigid coupling provides a solid connection with zero misalignment tolerance, used only where shafts are precisely aligned and maximum torsional stiffness is required.
Key Facts
- Flexible gear coupling: absorbs angular, parallel and axial misalignment plus shock.
- Rigid coupling: solid, zero-misalignment, maximum torsional stiffness.
- Use rigid only for precisely aligned shafts (e.g. vertical pump shafts).
- Use flexible for almost all motor-driven industrial drives.
Frequently Asked Questions
When should I use a flexible gear coupling instead of a rigid coupling?
Use a flexible gear coupling when shafts may have angular or parallel misalignment, thermal expansion, or shock loads. Use a rigid coupling only when shafts are perfectly aligned and you need maximum torsional rigidity.
When is a rigid coupling the right choice?
Use a rigid coupling only when shafts are precisely and permanently aligned and maximum torsional stiffness is needed — for example, vertical pump line shafts or close-coupled assemblies.
Can a rigid coupling tolerate misalignment?
No. Rigid couplings have effectively zero misalignment tolerance; any angular or parallel offset transfers load directly to bearings and shafts, causing premature failure — use a flexible gear coupling instead.
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