Rotor structure, especially for hingeless rotary wing aircraft

US4243359A · kind A · utility

Assignee

• Messerschmitt Bolkow Blohm GmbH · DE

Inventors

• Alois Schwarz · Putzbrunn, DE
• Karlheinz Mautz · Ottobrunn, DE
• Michael Stephan · Berlin, DE

Key dates

• Filing date: Dec 26, 1978
• Grant date: Jan 6, 1981
• Expiry date: Dec 26, 1998

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B64C27/327
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

The present hingeless rotor structure, especially for rotary wing aircraft, omprises at least one pair of rotor blades, whereby the blades of a pair are arranged diametrically opposite each other. The blades are secured to a rotor head for proper blade angle adjustment. Each blade has its root or radially inner end secured in a blade root sleeve which in turn is held in a respective blade angle bearing bushing. The blades of a pair are interconnected by a tension resistant, torsionally yielding member. One bearing which is pressure loadable in the direction of the longitudinal blade axis is provided for each blade pair between one of the respective blade root sleeves and the corresponding blade angle bearing bushing. The tension resistant, torsionally yielding member is capable of a certain stretching or elongation during operation. In order to compensate for such an elongation, the tension resistant, torsionally yielding members are installed in such a manner that in the rest or non-rotating condition of the blades, the center is radially displaced from the axis of rotation of the rotor head toward the respective pressure loadable bearing by one half of the length of said elongati…