Four-blade rotor, especially for helicopters

US4251188A · kind A · utility

Assignee

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

Inventors

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

Key dates

• Filing date: Nov 20, 1978
• Grant date: Feb 17, 1981
• Expiry date: Nov 20, 1998

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B64C27/45
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

The present four-blade rotor structure comprises two pairs of rotor blades. iametrically opposite each other located blades form a pair and the blades of a pair are connected to each other by coupling belts which are tension resistant and torsionally yielding. One coupling belt extends substantially horizontally whereas the other extends substantially vertically. The coupling belts are centered in the rotor head by respective centering bodies. The centering bodies are connected to their respective belt by bearing elements capable of taking up pressure loads while simultaneously permitting a blade angle adjustment. In a modification the bearings may be slide bearings.