HELICOPTER TAIL ROTOR GEARBOX Russian patent published in 2018 - IPC B64C27/82 F16H57/04 

FIELD: aviation.

SUBSTANCE: invention relates to aviation, in particular to lubrication systems for helicopter tail rotor gearboxes. Helicopter tail rotor gearbox includes a housing, an output shaft for connection to a tail rotor rotatably supported in the housing and having an open end therein, an input member rotatably supported in the housing, gearing providing a power transmitting connection between the input member and output shaft, a pitch control shaft for effecting a change in the pitch of the tail rotor. Pitch control shaft is disposed at least partially within the output shaft, rotatable therewith, and movable relative thereto along the rotational axis of the output shaft. Actuating member is movable in the axial direction of the output shaft but is held against rotation therewith. Bearing assembly is positioned in between the pitch control shaft and the actuating member for permitting relative rotation therebetween. Gearbox includes at least one structural member for diverting oil, dispersed within the housing in use, towards the open end of the output shaft.

EFFECT: lubrication of the thrust bearing assembly located in the end part of the pitch control shaft is provided.

17 cl, 15 dwg