Blade connection for helicopter rotor blades

US4028000A · kind A · utility

Assignee

• Messerschmitt Bolkow Blohm GmbH · DE

Inventors

• Emil Weiland
• Alois Schwarz · Putzbrunn, DE
• Hubert Frommlet

Key dates

• Filing date: Oct 31, 1975
• Grant date: Jun 7, 1977
• Expiry date: Oct 31, 1995

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B64C27/51
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

Resilient drive means for a helicopter rotor blade. The rotor blade is pivotally supported on a stub shaft which is in turn supported on the rotor hub. First means are fixed to the rotor blade and second means fixed to the stub shaft with resilient and adjustable means positioned therebetween for controlling the angular relationship between the rotor blade and the stub shaft. In this embodiment, said first means comprise a shoulder which projects from the rotor blade and the second means comprise a rectangular hollow frame which is fixed to the stub shaft. The shoulder projects into the hollow frame. Threaded means acting through resilient means holds the first and second means in selected pivotal adjustment with respect to each other but the resilient component thereof permits sufficient slight lead lag movement therebetween as to effect damping of the lead lag mode of the rotorblade. The adjustment capability permits sufficient adjustment of the blade with respect to the hub to ensure desired balance between the several blades of a given rotor.