What are the main types of industrial couplings?
Quick answer
The types used on heavy industrial drives are gear, grid, fluid, spring and flexible couplings. Gear couplings carry the highest torque in the smallest envelope, grid and spring couplings absorb shock, fluid couplings cushion starting torque, and flexible couplings tolerate misalignment without lubrication.
Gear couplings
Two hubs with external teeth engaging an internally toothed sleeve. They carry the highest torque for a given diameter and suit kiln and mill drives, but need correct lubrication and periodic inspection of the tooth flanks.
Grid and spring couplings
A serpentine steel grid or spring pack connects two hubs. The element flexes under load, damping torsional shock from crushers and reciprocating equipment, and it can be replaced without moving the connected machines.
Fluid and flexible couplings
Fluid couplings transmit torque through oil, cushioning the start-up of large drives. Flexible couplings use an elastomeric or laminated element to absorb angular and parallel misalignment with little maintenance.
Choosing between them
Selection follows shaft diameters, torque and service factor, expected misalignment, shock loading, and whether lubrication can be maintained. Monmet quotes couplings against the shaft data on your drawing or the coupling being replaced.
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