MAIN ROTOR Russian patent published in 2006 - IPC B64C27/32 

FIELD: aviation; main rotors.

SUBSTANCE: proposed main rotor includes revolving outer body with gear wheel of preliminary overspeeding and gimbal frame. Non-revolving inner shaft is connected with outer shaft by means of bearings. Leverage control mechanism arranged inside non-revolving shaft is used for tilting of axis and motion if revolving unit in vertical direction; this unit is mounted on control mechanism and is connected with blade turning levers which are connected with hub through axles and attachment members with feathering hinges. Attachment members are made in form of clamps to which blades are connected. Hub is provided with gimbal frame and two beams with elastic cantilever parts interconnected by means of pins. Clamps secured on spherical bearings at angle of conicity relative to plane of plates are turnable in bearings. Beams are articulated with revolving outer body of hub by means of gimbal frame located above bell crank body. Axes of gimbal frame are mutually perpendicular and point of intersection of axes lie on hub rotational axis; axis of frame lying in plane of flapping is common axis of feathering hinge.

EFFECT: reduced level of hub loading; increased service life; enhanced reliability of control and enhanced safety of flight.

1 dwg