What causes coupling failure?

What causes coupling failure?

Couplings fail for several reasons, but the primary causes are improper selection for the particular application; excessive misalignment; improper, inadequate, or insufficient lubrication; harsh environmental or operating conditions; and excessive speeds or loads.

What will happen if the coupling fails?

The function of a coupling is to connect two rotating shafts, for the transfer of rotary motion and torque. However, if just one of these factors is not met, a coupling can prematurely fail, causing anything from a small inconvenience, to a significant financial loss, and even the potential of personal injury.

What is the failure mode of gearflex couplings?

The couplings in use are Falk gearflex style and are lubricated with multipurpose grease as recommended by our lube supplier. The mode of failure is severe wear on both hub teeth and cover teeth resulting in a locked coupling and increased motor vibration.

What causes a power transmission coupling to fail?

As might be expected, approximately 75% of gear and chain coupling failures are caused by misalignment or improper or insufficient lubrication. Some newer types of gear and chain couplings contain nylon gear sleeves or nylon chains respectively and these types do not require lubrication.

What causes a gear coupling tooth to fail?

Common causes of wear or failure include normal wear (again, gear coupling teeth are designed to wear over time), lack of lubrication, torque overload, misalignment, fatigue (of flange or bolt), and thrust loading (sleeve seal end rings). Normal wear is generally characterized by tooth wear localized primarily to the center of the teeth.

How are spline shafts used in gear couplings?

Spline shaft connections have contact lengths between hub and shaft as low as .75 when all the splines transmit the torque equally. Spline shaft and hub applications are rare on gear couplings. 2. Interference Fits The interference fit has a hub bore diameter that is slightly smaller than the shaft diameter under all tolerance combinations.