Lead-lag damper for rotor hubs

B - Operations – Transporting – 64 – C

Patent

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Details

B64C 27/51 (2006.01)

Patent

CA 2714527

A lead-lag damper for a rotor assembly has a body mounted to either an inboard portion of a blade assembly or a fixed portion of the rotor assembly. A piston carried within the body is configured to allow for relative motion between the body and the piston. The piston defines opposing chambers within the body, the chambers being in fluid communication through a fluid passage. A link connects the piston to the other of the inboard portion of the blade assembly and the fixed portion of the rotor assembly, and the link engages a central portion of the piston. The piston acts on fluid in the chambers during relative motion between the piston and the body and causes fluid flow between the chambers through the fluid passage. Flow through the passage acts to damp lead-lag motion of the blade assembly relative to the fixed portion of the rotor assembly.

L'invention concerne un amortisseur de traînée pour un ensemble rotor comprenant un corps monté soit sur une partie intérieure d'un ensemble pale soit sur une partie fixe de l'ensemble rotor. Un piston porté dans le corps est conçu pour permettre un déplacement relatif entre le corps et le piston. Le piston définit des chambres opposées à l'intérieur du corps, les chambres étant en communication fluidique via un passage de fluide. Une liaison relie le piston à l'autre partie parmi la partie intérieure de l'ensemble pale et la partie fixe de l'ensemble rotor, et la liaison entre en prise avec une partie centrale du piston. Le piston agit sur le fluide dans les chambres pendant le déplacement relatif entre le piston et le corps et provoque la circulation du fluide entre les chambres à travers le passage de fluide. Le flux qui circule dans le passage permet d'amortir le déplacement de traînée de l'ensemble pale par rapport à la partie fixe de l'ensemble rotor.

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