| 主权项 |
1. A rotary system for a rotary aircraft, comprising:
a rotor mast; a swashplate rotatably carried by the rotor mast; and a hub assembly for securing a rotor blade to the rotor mast, the hub assembly having:
a yoke rigidly attached to the rotor mast, the yoke having:
a thickness; andan opening extending through the thickness, the opening forming a bridge;a blade grip for securing the rotor blade to the yoke, the grip having:
an upper plate; anda lower plate;a pitch horn operably associated with the swashplate for providing pitching movement of the blade during flight, the pitch horn being positioned outside the opening of the yoke, disposed between the upper plate and the lower plate of the grip, and attached to bridge;a spoke extending through the opening of the yoke and attached to the upper plate and the lower plate of the grip; anda bearing assembly configured to attach the spoke and a pitching arm to the bridge, the bearing assembly having:a first bearing configured to attach the spoke to the bridge, the first bearing being a spherical centrifugal bearing having a conical profile; anda second bearing disposed within the pitch horn and configured to elastically couple the pitch horn to the bridge;wherein a focal center of the spherical centrifugal bearing is positioned away from the yoke;wherein the focal center is selectively located as to fall within a cross-section of the second bearing; and wherein the bearing assembly controls blade forces exerted against the hub assembly during flight. |
