Originally Posted by
AW009
@Lonewolfe_50: Then let’s return to auto-transmisson gearboxes of cars. You will never find an epicyclic module with planet gearwheels being the outer race of it’s roller bearing and with a ring gear being the housing of the gearbox. By AVIO AERO resp.in H225, AS332L2 and TP400D6 this might be a standard
(https://www.yumpu.com/xx/document/vi...0976/planetary)
That image you linked shows an epicyclic ring gear attached by a flexure. The flexure flange is clamped between the housing faces, but is not a structural member of the housing. This flexure attachment is commonly used with large epicyclic ring gears since it provides some misalignment capability between the planet and sun gears.
As descanio noted, the CH-47 gearbox does use the epicyclic ring gear as part of the housing structure.
As for automatic auto transmissions with epicyclic gear stages, most of the ones I have seen incorporate the outer bearing race of the planet gears as part of the gear.
