Qantas A380 uncontained #2 engine failure

[mike-wsm]

Originally Posted by Turbine D

You can see this patent by going to: Parabolically helical spline shaft coupling - US 5533825 - IP.com

Thanks, TD, that makes sense.

The patent describes a set of splines that are longditudinal and join two shafts, inner and outer.

But when torque is transmitted the shafts twist and the load becomes unevenly distributed along the length of the splines.

The patent says the way to compensate for this is to machine the splines so that they will match when torque is applied.

I guess assembling the pre-reverse-distorted splines to each other requires a certain amount of torque and persuasion.