Compound hub spring system for helicopters

Details Compound hub spring system for helicopters Compound hub spring system for helicopters

B - Operations, Transporting

64

C

244/15

B64C 27/04 (2006.01) B64C 27/32 (2006.01) B64C 27/35 (2006.01)

Patent

CA 1113912

COMPOUND HUB SPRING SYSTEM FOR HELICOPTERS ABSTRACT OF THE DISCLOSURE A system for opposing helicopter blade flapping applies restraining forces at a low spring rate at low flap angles and at a high spring rate at flap angles greater than a predetermined angle. More particularly, bearings rotatably support the blade yokes on rotor hub trunnions which form a flapping axis. resilient mechanical coupling between the blade yokes and the hub trunnion apply a restraining force having a characteristic linear with flapping angle. A second restraint mounted to rotate about the flapping axis with the rotor, applies a nonlinear restraining force which preferably rapidly increases beginning at a predetermined flap angle, and over the range short of hard flapping contact between the rotor and the rotor mast.

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