MAIN-ROTOR HUB Russian patent published in 2004 - IPC

FIELD: aviation; use of controllable aerodynamic surfaces.

SUBSTANCE: main-rotor hub has revolving external body with gear wheel connected with non-revolving internal shaft inside which leverage-type control mechanism is mounted for inclination of axis and vertical motion of rocker arm connected with it. Rocker arm mounted on leverage-type control mechanism is connected with each blade through clamp fitted with feathering hinge made in form of pin and located in body of bell crank at cone angle to plane of rotation of hub. Mounted on cantilever parts of each pin are clamp and support with thrust bearing which are rotatable around pin axis. Clamp is connected with support provided with thrust bearing through which centrifugal force is transmitted from blade to bell crank body which is articulated with revolving external body of hub through gimbal frame located above bell crank body. Axes of frame are perpendicular relative to each other and point on intersection of axes lies on axis of rotation of hub. Axis of frame parallel to axis of blades is axis of common feathering hinge relative to which bell crank body deflects at deflection of rocker arm and axis of frame perpendicular to axis of blades is matched with axis connecting the rocker arm with blade turning lever and is just axis of common flapping hinge. Leverage-type control mechanism has three separate rods.

EFFECT: simplified construction; increased service life of lifting system; reduced level of loads in control system; possibility of performing jump take-off autogyro.

1 dwg