Rotor, especially for rotary wing aircraft

US4690615A · kind A · utility

Assignee

• Messerschmitt-Boelkow-Blohm Gesellschaft mit beschraenkter Haftung · DE

Inventors

• Gerald Kuntze-Fechner · Waakirchen, DE
• Otmar Friedberger · Neubiberg, DE
• Michael Hahn · San Francisco, US

Key dates

• Filing date: Sep 2, 1986
• Grant date: Sep 1, 1987
• Expiry date: Sep 2, 2006

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B64C2027/4736
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A rotor, especially for rotary wing aircraft, has a rotor hub (1) with one r 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).