Rotor blade for a bearingless rotor of a rotorcraft

US8128367B2 · kind B2 · utility

Assignee

• Eurocopter Deutschland GmbH · DE

Inventors

• Bernhard Enenkl · Zetel, DE
• Rupert Pfaller · Riemerling, DE

Key dates

• Filing date: Mar 14, 2008
• Grant date: Mar 6, 2012
• Expiry date: Jan 5, 2031

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B64C27/473
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A rotor blade for a bearingless rotor of a rotorcraft includes a flapwise-flexible and lead-lag-flexible rotor blade attachment region, an inner rotor blade segment, and an outer rotor blade segment. The inner rotor blade segment includes a blade root region and an aerodynamically effective rotor blade profile having a front profile region and a rear profile region relative to a blade depth direction. The front profile region includes a spar disposed in the blade root region and extending in the blade radius direction, the front profile region and spar embodied as a torsionally flexible hollow body in a region of the inner rotor blade segment, and the rear profile region being torsionally stiff. The front profile region and the rear profile are separated by a separation distance in the inner rotor blade segment. The torsional flexibility of the front profile region and the separation distance decreases with increasing blade radius in the inner rotor blade segment. In addition, in the outer rotor blade segment, the front and the rear profile segment are embodied as a closed, torsionally stiff profile.