The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 06, 2012
Filed:
Mar. 14, 2008
Bernhard Enenkl, Bockhorn, DE;
Rupert Pfaller, Riemerling, DE;
Bernhard Enenkl, Bockhorn, DE;
Rupert Pfaller, Riemerling, DE;
Eurocopter Deutschland GmbH, Donauwoerth, DE;
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.