|Gear Coupling Hub Burst Due to Over Torque|
The root cause for this over-torque failure may be that the coupling was undersized for the given application (perhaps the wrong factor of safety was used when calculating required torque), that the application saw a massive unexpected peak load (and perhaps the coupling failing may have saved more expensive equipment from failing), the coupling bore and/or keyway were oversized relative to the maximum bore and keyway combination specified from the manufacturer for the given product size, or the coupling had excessive misalignment.
|Jaw Coupling Hub Burst Due to Over Torque|
It is also important to note that, while undersized/underrated couplings are not good and can cause failures... it is also a mistake to significantly oversize a coupling. There are a number of drawbacks to this approach, including excessive overhung loads, potentially reduced performance, and cost.... and should be avoided.
For further information on sizing a coupling, please consider reading "Coupling Service Factors - Best Practices" and "Coupling Sizing Torque - How to Quick Calculate". For further information on misalignment, please see "Top Reason for a Coupling Failure".
To learn more on coupling failure analysis, go to:
And, if you still have questions or concerns... please feel free to contact a Lovejoy application engineer or specialist.