초록 ▼

The wing blades of a hingeless and bearingless multiblade rotor are connected to a substantially rigid rotor hub by spar sections elastically twistable and bendable in the flapping direction and in the lead-lag direction. The mounting positions on the periphery of the rotor hub for connection of the

The wing blades of a hingeless and bearingless multiblade rotor are connected to a substantially rigid rotor hub by spar sections elastically twistable and bendable in the flapping direction and in the lead-lag direction. The mounting positions on the periphery of the rotor hub for connection of the spar sections of the respective blades are off-set relative to the angular position of the corresponding blades to which they are connected. Further, the mounting positions for the spar sections of each rotor blade are situated on the periphery of the half side or far side of the rotor hub, facing away from the respective rotor blade. A rear spar section of each mounted rotor blade with reference to the direction of rotation, overlaps the front spar section of the immediately following rotor blade but with free clearance and spacing between the overlapping spar sections in the direction of the rotor axis so that the maximum bendable length of the elastic spar sections is afforded without interference between the blades. The effective or virtual flapping hinges and lead-lag hinges of each blade is shifted closer to the rotor axis thereby minimizing the masses necessary for propeller moment compensation, and static and dynamic balancing of the rotor blades, as well as reducing the required steering forces.

대표청구항 ▼

A hingeless and bearingless multiblade rotor for rotary wing aircraft, comprising: substantially rigid rotor hub means having a rotational axis and including a plurality of mounting points around the periphery of the rotor hub means; a plurality of lift producing wing means each having a longitudina

A hingeless and bearingless multiblade rotor for rotary wing aircraft, comprising: substantially rigid rotor hub means having a rotational axis and including a plurality of mounting points around the periphery of the rotor hub means; a plurality of lift producing wing means each having a longitudinal wing axis extending substantially radially relative to said rotational axis, each wing means including its respective blade root and at least two spar sections of elastic material for connecting each wing means to respective ones of said mounting points on the rotor hub means with said at least two spar sections, said spar sections being of substantially equal length and elastically bendable and responsive to loads in the torsional direction extending radially and longitudinally of the wing means, to loads in the flapping direction and to loads in the lead-lag direction, each wing means being connected to the rotor hub means at its mounting points all of which are located in or behind, as viewed radially inwardly along the respective longitudinal wing axis, a plane extending perpendicularly to the respective wing axis and in said rotational axis, whereby the freely twistable length of the spar sections is optimized, said at least two spar sections of a wing means being arranged so that with reference to the direction of rotation of the rotor, the trailing spar section of each rotor blade means overlaps the leading spar section of the immediately following rotor blade, said overlapping spar sections being spaced apart in the axial direction of the rotor, said spar sections thereby forming a staggered, overlapping arrangement.