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Apparatus for controlling both collective and cyclic pitch of blades of a helicopter rotor comprises a non-rotating plate which is connected via a fixed caliper and servo controls to a fixed housing and to which is attached the internal ring of a ball race bearing. The external ring of the bearing c

Apparatus for controlling both collective and cyclic pitch of blades of a helicopter rotor comprises a non-rotating plate which is connected via a fixed caliper and servo controls to a fixed housing and to which is attached the internal ring of a ball race bearing. The external ring of the bearing carries a rotating plate, which is connected by means of rotating caliper or links to each of the rotors and by means of pitch rods to control levers for adjusting the pitch of the blades. The non-rotating plate is fixed to external armatures of laminated joint pieces which are mounted slidingly up and down a guide base. The collective pitch is controlled by sliding the assembly of non-rotating plate and joint pieces up or down the guide base while the cyclic pitch is controlled by inclining the assembly relative to the main rotor shaft. This inclination involves deformations in the laminated joints.

대표청구항 ▼

Apparatus for controlling the collective pitch and cyclic pitch of blades of a rotor of a rotorcraft, the rotor craft having a main body and a housing rigidly connected to the main body, the rotor comprising a shaft extending out of the housing rotatably driven about a rotor rotation axis and rotor

Apparatus for controlling the collective pitch and cyclic pitch of blades of a rotor of a rotorcraft, the rotor craft having a main body and a housing rigidly connected to the main body, the rotor comprising a shaft extending out of the housing rotatably driven about a rotor rotation axis and rotor blades connected to the shaft, each rotor blade having a pitch, a control lever for controlling the pitch, and a respective pitch control rod connected to the control lever, said apparatus comprising: two annular plates coaxially mounted around said shaft, one of said plates being a turning plate and the other being a non-turning plate; ball bearing means interconnecting said plates; at least one lower linking member preventing rotation of said non-turning plate about said rotation axis connected to the housing and to the non-turning plate, said non-turning plate including articulating means for mounting said apparatus to be displacable in translation in the direction of said rotation axis and tiltable with respect to said rotation axis; at least one upper linking member driving said turning plate in rotation with the shaft linked to the shaft and to said turning plate, the pitch control rod of each of the rotor blades being connected to said turning plate; combined function collective pitch and cyclic pitch control member connected to said non-turning plate for displacing it along said shaft and for tilting it with respect to said rotation axis, said turning plate following the movement of said non-turning plate and transmitting these movements to the pitch control levers via the pitch control rods; said articulating means including at least three deformable laminated assemblies spaced apart from one another and distributed about the shaft, each assembly comprising a stack of alternating dish-shaped elements of rigid material and layers of an elastic material allowing, by shear deformation of said elastic material, said plates to be tilted with respect to said rotation axis for controlling cyclic pitch, and a radially inner rigid armature and a radially outer rigid armature between which said stack is sandwiched, said inner armature being armated substantially in the form of an arc of a circle, the inner armatures of all said assemblies being assembled together forming a unitary radially inner ring slidingly mounted in the direction of said rotation axis, the outer armature of all said assemblies forming a crown supporting said ball bearing means.