초록 ▼

The wings of a rotary wing aircraft comprise, for example, four wing blades forming two pairs of wing blades whereby the blades of a pair are located diametrically opposite each other. The blades of a pair are connected to each other by a spar extending from wing blade to wing blade. The spar is ope

The wings of a rotary wing aircraft comprise, for example, four wing blades forming two pairs of wing blades whereby the blades of a pair are located diametrically opposite each other. The blades of a pair are connected to each other by a spar extending from wing blade to wing blade. The spar is operatively secured to the rotor head. Each spar has between the rotor head and the respective wing blade a zone with a torsion yieldability larger than in the spar outside said zone. A beam stiff against bending, bridges the zone, referred to as a torque soft zone, from the wing blade toward the rotor head except for a small flexible section between the rotor head and the radially inner end of the beam. The flexible section permits the blade flapping movements and the blade lead-lag movements.

대표청구항 ▼

A hingeless rotor structure for rotary wing aircraft, comprising rotor head means, an even number of wing blade means forming at least one pair of wing blades, a single length of spar means operatively interconnecting the blade means of a pair, securing means rigidly securing said single length of s

A hingeless rotor structure for rotary wing aircraft, comprising rotor head means, an even number of wing blade means forming at least one pair of wing blades, a single length of spar means operatively interconnecting the blade means of a pair, securing means rigidly securing said single length of spar means to said rotor head means, said single length of spar means comprising two members located on opposite sides of the rotor head, each spar member being located between the rotor head and the respective wing blade means, each spar member having a flexible section (2.1) having a given torsion yieldability and a torque soft zone (2.2) extending between the respective wing blade means (1) of a pair of wings and the flexible section (2.1), beam means (6) stiff against bending arranged to bridge the respective torque soft zone, bearing means (7) operatively securing said beam means at the radially outer end thereof to the respective wing blade means for permitting blade angle movements of the respective wing blade and substantially rigid means (6.1) rigidly securing the radially inner end of said beam means (6) to said spar means at a point spaced from said rotor head means so as to leave said flexible section (2.1) of the spar member between said rotor head means and said securing means (6.1), said flexible section (2.1) of the spar member being sufficiently yielding relative to bending loads to permit the blade flapping movements as well as the blade lead-lag movements and wherein said torque soft zone (2.2) of said spar means comprises a plurality of mutually separated strands (2.2.1) bridged by said beam means (6), said torque soft zone (2.2) having, due to said mutually separated strands (2.2.1), a torsion yieldability higher than said given torsion yieldability.