EC225 crash near Bergen, Norway April 2016

[Concentric]

Originally Posted by riff_raff

Load distribution between epicyclic planet gears has also been a chronic problem with large wind turbine transmissions. Here is an interesting tech paper from Timken that describes their flexible planet pin concept.

Thanks riff for another interesting read.
That IFB looks much superior to the AH planetary arrangement, on so many levels:
- Enabling use of taper roller bearings,
- Preloading the bearings,
- Reversing the angle of the bearings from ‘dihedral’ to ‘anhedral’,
- Increasing material in the rim, giving a stronger ring in bending.

It is a great pity that technology was not around when the L2/225 epicyclic module was designed.