HELICOPTER MAIN ROTOR HUB Russian patent published in 1998 - IPC

FIELD: aviation main rotor hub connecting blades with drive shaft. SUBSTANCE: hub has boss with flexible loop-type panels and sleeves which have holes for securing blades. Each sleeve is connected with boss in base of panel through hinged support and damper. Each sleeve is also connected with hinge of panel through flexible bearing. Thrust bearing is mounted on inner side of panel hinge by means of frame. Frame and hinge of panel are connected for mutual motion. They form lag hinge of main rotor hub. Sleeve is additionally connected with frame by means of two hinges: root and peripheral hinges which are located on both sides of thrust bearing. These hinges form feathering hinge of main rotor hub together with bearing support. EFFECT: reduced mass of main rotor hub; realization of unpowered control of helicopter. 4 cl, 9 dwg