Multi-bladed tail rotor hub design for coriolis relief

B - Operations – Transporting – 64 – C

Patent

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Details

B64C 27/82 (2006.01) B64C 27/35 (2006.01) B64C 27/48 (2006.01)

Patent

CA 2374652

A multi-bladed tail rotor assembly is disclosed that provides higher aerodynamic performance, damage tolerant design with 10,000-hour life expectancy, and which requires low maintenance through the use of composites and elastomerics. The tail rotor hub assembly includes two stacked yoke assemblies having multi-bladed teetering rotors, each mounted on a single drive mast. Each yoke assembly includes a yoke hub having a transverse bore therethrough, a bearing assembly disposed within the bore, and retention means for aligning and securing the bearing assembly within the bore. Each bearing assembly includes a trunnion portion having trunnion arms that extend outwardly from a trunnion body portion, and an elastomeric bearing disposed about each trunnion arm. The tail rotor assembly utilizes a composite twist strap flexure to accommodate collective pitch control integral with each rotor blade.

Un assemblage multi-pales de rotor de queue qui offre une performance aérodynamique plus élevée, une conception qui tolère les dommages avec une espérance de vie de 10 000 heures, et qui nécessite peu d'entretien grâce à l'utilisation de composites et élastomères. L'ensemble de moyeux du rotor de queue comprend un ensemble de deux chapes empilées ayant des rotors basculants multi-pales, chacune montée sur un seul mât d'entraînement. Chaque ensemble de moyeux comprend une chape ayant un trou transversal, un ensemble de roulements disposés dans le trou, et des moyens de rétention pour aligner et fixer l'ensemble de roulements dans le trou. Chaque ensemble de roulements comprend une section de tourillon ayant des bras de tourillon qui s'étendent vers l'extérieur d'une partie d'un tourillon, et un roulement en élastomère disposé sur chaque bras de tourillon. L'assemblage du rotor de queue utilise une courroie à torsion flexible pour contrôler les pas collectifs de chaque pale du rotor.

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