HELICOPTER DRIVETRAIN Russian patent published in 2015 - IPC B64C27/14 B64D35/00 F16D11/10 

FIELD: transport.

SUBSTANCE: invention relates to aircraft engineering, in particular to helicopter drivetrain designs. Helicopter drivetrain includes engine via clutch connected by its shaft with reduction gear driving shaft kinematically connected with shaft of helicopter rotor, with rotor hub carrying pivotally connected with it blades with roots provided with followers for connection with swash plate. Engine shaft is connected with half-clutch having grooves made with curved walls and located in parallel to its axis. Flat spring packs enter these grooves which packs are connected with driven half-clutch. The half-clutch is connected with possibility of free relative rotation with reduction gear driving shaft connected with drum by ratchet wheel. Teeth of ratchet wheel are located with possibility to engage with teeth on journal box connected with driven half-clutch by cylindrical spline coupling and having groove. On the outer surface, carrier with axial grooves is located in which grooves corresponding journal box teeth are located. The carrier has inner hollow cylindrical tang the outer surface of which is equipped with circular flange. On the outer surface, shoes with grooves for flange are located which shoes are provided with axial grooves and being able to contact with yoke teeth. Between yoke teeth and shoe grooves, arc-shaped springs are installed. Between the carrier and the journal box, springs are installed which springs are able to rest on corresponding butt ends of the carrier and the journal box.

EFFECT: higher helicopter drivetrain reliability during periods of unstable motion and in case of flight in autorotation regime when engine fails.

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