Helicopter landing gear assembly

B - Operations – Transporting – 64 – C

Patent

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Details

B64C 25/06 (2006.01) B64C 25/52 (2006.01)

Patent

CA 2175807

An improved helicopter landing gear assembly (12) to substantially increase useful service life. The crosstubes (14) are constructed of a material that allows use of thicker crosstubes thereby reducing the operating stress in the crosstubes (14) and helping to increase the fatigue life, while at the same time preserving the required energy absorption characteristics. The inside and outside of the crosstubes (14) are shot peened to help increase the fatigue life. The crosstubes (14) are formed in an unstable temper condition thereby reducing the stress that is induced into the part during formation, and thus connected to the crosstubes (14) by fasteners (64) located at the sides of the straps (20) and closer to the neutral bending axis of the crosstube (14) so that the fasteners (64) and the fastener holes (48) are subjected to lower stress levels. The combination of these improvements results in a substantially increased life of the landing gear assembly.

Train d'atterrissage d'hélicoptère amélioré (12) permettant une utilisation prolongée. Le matériau des tubes d'accouplement (14) permet d'utiliser des tubes plus épais, ce qui limite les contraintes s'exerçant sur lesdits tubes (14) et contribue à prolonger leur résistance à la fatigue, tout en préservant simultanément les caractéristiques nécessaires d'absorption d'énergie. L'intérieur et l'extérieur des tubes d'accouplement (14) sont grenaillés, afin d'améliorer la résistance à la fatigue. Ils sont fabriqués par revenu à l'état instable, ce qui limite les contraintes s'exerçant dans la pièce pendant la fabrication et sont reliés au moyen d'éléments de fixation (64) situés au niveau des côtés des brides de fixation (20) et plus à proximité de l'axe d'incurvation neutre dudit tube (14), de telle manière que les éléments de fixation (64) et leurs perçages (48) sont soumis à des niveaux de contrainte limités. La combinaison de ces améliorations permet d'augmenter sensiblement la durée de vie du train d'atterrissage.

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