Electromechanical actuator assembly with mechanical override feature

A passenger seat assembly, comprising:

• a passenger seat including one or more adjustable components;
• and
• an electromechanical actuator assembly (EMA) for driving motion of the one or more adjustable components, the EMA comprising:
• an electric motor including an output shaft;
• an epicyclic gearbox including a ring gear having an inner tooth profile for transferring power from the output shaft, and an outer tooth profile;
• and
• a mechanical override mechanism, comprising:
• a pinion gear having an inner splined profile, and an outer tooth profile meshed with the outer tooth profile of the ring gear;
• an anti-rotation bushing disposed at one end of the pinion gear, the anti-rotation bushing having an inner splined profile;
• and
• a release pin disposed in the anti-rotation bushing, the release pin having an outer splined profile engaging the inner splined profile of the anti-rotation bushing and configured to engage the inner splined profile of the pinion gear;
• wherein:
• in a first operating mode of the EMA, the outer splined profile of the release pin is engaged with the inner splined profile of the pinion gear to rotationally constrain the pinion gear thereby rotationally constraining the ring gear;
• and
• in a second operating mode of the EMA, the release pin is axially displaced to disengage the outer splined profile of the release pin from the inner splined profile of the pinion gear to allow the pinion gear to rotate thereby allowing the ring gear to rotate.

A mechanism for controlling ring gear rotation, comprising:

• a pinion gear having an inner splined profile, and an outer tooth profile meshed with an outer tooth profile of the ring gear;
• an anti-rotation bushing interfacing with one end of the pinion gear, the anti-rotation bushing having an inner splined profile;
• and
• a release pin disposed in the anti-rotation bushing, the release pin having an outer splined profile engaging the inner splined profile of the anti-rotation bushing and configured to engage the inner splined profile of the pinion gear;
• wherein:
• the outer splined profile of the release pin engages with the inner splined profile of the pinion gear to rotationally constrain the pinion gear thereby rotationally constraining the ring gear;
• and
• the release pin is axially displaceable to disengage the outer splined profile of the release pin from the inner splined profile of the pinion gear to allow the pinion gear to rotate thereby allowing the ring gear to rotate.