Rotary blade retention system

Details Rotary blade retention system Rotary blade retention system

B - Operations, Transporting

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C

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B64C 11/00 (2006.01) B64C 11/06 (2006.01) B64C 27/32 (2006.01) B64C 27/35 (2006.01) B64C 27/48 (2006.01)

Patent

CA 1048472

ABSTRACT OF THE INVENTION A rotary blade retention system comprises a rotor hub rotatable about a central axis and a retention assembly coupling at least one blade to the rotor hub. The blade extends generally radially from the hub and rotates with the hub about its central axis. The retention assembly includes a frictionless thrust bearing and an elastomeric thrust bearing connected together in series. The two bearings are mounted relative to the blade and the rotor hub such that when a centrifugal load is imposed on the blade, the bearings are loaded in compression and cooperate to restrain the blade against the centrifugal load. The friction- less bearing permits free pivotal movement of the blade about its longitudinal axis so as to effect variations in the pitch of the blade. The elastomeric thrust bearing includes at least one laminated bearing having a plurality of layers of rigid and elastomeric material which alternate lengthwise of the blade. The layers are also inclined relative to the longitudinal axis of the blade to define an effective elastic center for the bear- ing located along the blade radially outward of the two bearings relative to the rotor hub.

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