초록 ▼

A rotor, especially for rotary wing aircraft, has a rotor hub (1) with one or more torsionally stiff rotor hub arms (1.1) projecting radially outwardly. A rotor blade (2) having a blade root (2.1), a blade wing section (2.3), and a torsionally flexible blade neck (2.2) is attached by bolts (3) to ea

A rotor, especially for rotary wing aircraft, has a rotor hub (1) with one or more torsionally stiff rotor hub arms (1.1) projecting radially outwardly. A rotor blade (2) having a blade root (2.1), a blade wing section (2.3), and a torsionally flexible blade neck (2.2) is attached by bolts (3) to each rotor hub arm (1.1). A torsionally rigid blade angle control sleeve (5) extends without contact along each blade neck (2.2) and is rigidly connected at its radially outer end to the blade wing section (2.3) and is movably connected at the radially inner end to the blade root (2.1). In order to isolate the blade control from any blade flapping movements, and to reduce the distance between the flapping hinge point and the rotor hub (1), the rotor hub arm (1.1) is flat in a direction perpendicular to the blade rotation plane and is more flexible to blade flapping movements than the blade neck (2.2) is. The blade root (2.1) is in the form of a yoke or fork for attachment to the rotor hub arm (1.1), whereby the two shanks or prongs (2.1.1) of the yoke or fork form the base for the movable support of the blade control sleeve (5).

대표청구항 ▼

A rotor structure, especially for rotary wing aircraft, comprising rotor blade means having a blade pitch axis and defining a rotation plane in which said rotor blade means rotate,a rotor hub having a rotational axis, said rotation plane extending substantially perpendicularly to said rotational axi

A rotor structure, especially for rotary wing aircraft, comprising rotor blade means having a blade pitch axis and defining a rotation plane in which said rotor blade means rotate,a rotor hub having a rotational axis, said rotation plane extending substantially perpendicularly to said rotational axis, torsionally rigid rotor hub arm means projecting radially outwardly from said rotor hub, first means for connecting said rotor blade means to said rotor hub arm means, said rotor blade means comprising a blade root, a blade wing section, and a torsionally yielding blade neck arranged between said blade root and said blade wing section, said blade neck having a given first bending flexibility relative to blade flapping bending movements, torsionally rigid blade angle control sleeve means having a radially outer end and a radially inner end and extending without contact substantially coaxially along said blade neck, second means for movably connecting said radially inner end of said blade angle control sleeve to said blade root, and third means for rigidly connecting said radially outer end of said blade control sleeve to said blade wing section, said rotor hub arm means comprising a flattened section (1.1.1) having a second bending flexibility which is larger than said given first bending flexibility so that said blade flattened section is softer relative to blade flapping than said neck, said flattened section (1.1.1) comprising a cross-sectional profile which is flat in a direction substantially perpendicularly to said rotation plane, said first means for connecting said rotor blade means to said rotor hub arm means comprising fork means forming part of said blade root and further means for connecting said fork means to said rotor hub arm means, and wherein said second means for movably connecting said radially inner end of said blade angle control sleeve to said blade root are connected to said fork means.