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7604460 |
Rotorcraft rotors having twistable blades
A rotorcraft rotor includes a hub , a first blade having a first twistable structure secured to the hub by a first bolt and a first ring or washer , a second blade having a second twistable...
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7559743 |
Protection system, a bellows hinge, and an aircraft
In order to protect a hinge, an elastomer confinement structure is provided presenting:
upstream and downstream openings; a static cap; an upstream collar; and a hinge bellows.
Each...
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7530790 |
Rotor blade folding system
A rotor blade folding system includes a bearing housing which supports a bearing and rotor blade spindle which folds relative the rotor hub assembly about a fold axis. The rotor blade folding...
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7503750 |
Variable pitch rotor blade with double flexible retention elements
A propulsive thrust device for an engine includes a rotor blade and a hub assembly on which the rotor blade is mounted. The rotor blade comprises an airfoil and at least two support members. A...
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7384238 |
Rotor, rotocraft comprising a rotor of this type and method for adjusting the blade angle of a rotor
A rotor, in particular for a rotorcraft, encompassing: a rotor head, at least one rotor blade, and a rotor-head-end rotor-blade connector having an integral, bearingless,...
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7354248 |
Elastomeric bearing elements for droop stop mechanisms
An elastomeric bearing element having an outer race, an inner race, and at least two elastomeric segments secured between the inner and outer races is provided. The elastomeric segments are spaced...
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7290985 |
Rotary wing aircraft rod end and method of making a helicopter vehicle rod end with a precocked orientation
The invention provides a rotary wing aircraft helicopter vehicle rod end and method of making a rod end. The rotary wing aircraft rod end includes a nonelastomeric inner member having an outer...
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7275913 |
Rotor and gyrocopter with said rotor
A rotor, comprising at least one rotor blade connectable to a rotor head, which rotor blade possesses a blade neck having a virtual flapping hinge in the form of a flexurally soft, flexurally...
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7270516 |
Non-articulated rotor and rotorcraft comprising a rotor of this type
A hingeless rotor, in particular for a rotorcraft, comprising: a rotor head, a rotor mast having a rotor axis, a torque-transmission element nonrotatably joined to the rotor mast, at least one...
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7229251 |
Rotor hub fairing system for a counter-rotating, coaxial rotor system
A rotor hub fairing system includes an upper hub fairing, a lower hub fairing and a shaft fairing therebetween. The rotor hub fairing system is sized and configured to reduce the overall drag on a...
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7226272 |
Hingeless rotor provided with plate-shaped rotor head element and a rotorcraft provided with said rotor
The invention relates to a rotor comprising a rotor shaft, a rotation torque transmission element which is mounted thereon and at least one element of the plate-shaped rotor head whose axis of...
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7097169 |
Elastomeric bearing with modified cylindrical core
An elastomeric bearing having inner and outer races and a core. The core has a plurality of resilient laminae and a plurality of non-resilient laminae interleaved with one another. Each of the...
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7040863 |
Variable pitch rotor blade for shrouded rotors, in particular helicopter rotors
The blade includes a current part ( 1 ) having an aerodynamic profile enclosing a spar ( 7 ) and extending from blade tip ( 4 ) to a blade root ( 3 ) provided with a pitch sleeve ( 21 ), through...
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7021897 |
Blade pitch control disk device for a rotorcraft rotor
A cyclic swashplate device for controlling rotorcraft blade pitch is disclosed for application to rotorcraft swashplates, in particular, in helicopters. A cyclic swashplate device controls the...
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6971853 |
Elastomeric bearing system
An elastomeric bearing system capable of sustaining a high compressive load is adapted to connect the blades of a helicopter rotor to a rotor hub. The bearing system comprises first and second...
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6921249 |
Main rotor shear restraint
A main rotor shear restraint that includes two spherical ball segments, two corresponding bearing outer races, and a spring system for loading the bearing outer races against the two spherical ball...
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6910865 |
Helicopter rotor hub, and rotor featuring such a hub
There is described a hub for a helicopter rotor, having a main body, and a number of connecting members projecting from the main body and for the connection of respective blades; the main body and...
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6889965 |
Opposing conical preloaded elastomeric bearing assembly
The invention provides a weight-reducing bearing assembly for rotary aircraft. An opposed tapered conical elastomeric flap bearing assembly for rotary aircraft includes an outer housing having an...
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6848886 |
Snubber
A snubber inner member has a doubly convex outer surface portion having a central longitudinal axis. A shim/spacer stack secured to the outer surface portion couples the snubber inner member to the...
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6832894 |
Combined ball-and-damper device for a helicopter rotor
The invention relates to a combined ball-and-damper device for mounting between firstly a flexible spar connecting a helicopter blade to a rotor hub and secondly a torque tube for controlling the...
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6827553 |
Flexbeam damper assembly having transition shim clamp device
A damper assembly including a spherical elastomer bearing member, wherein the spherical elastomer bearing member is operable for accommodating relative motion and/or vibration, and a flat elastomer...
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6764280 |
Multi-bladed tail rotor hub design for coriolis relief
A multi-bladed tail rotor assembly is disclosed that provides higher aerodynamic performance, damage tolerant design with 10,000-hour life expectancy, and which requires low maintenance through the...
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6739834 |
Flexbeam
A flexbeam having a flapping part and a feathering and lead-lag part has a first composite member having a plurality of first layers and a plurality of second layers; and a second composite member...
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6695583 |
Snubber-vibration damper system for a bearingless main rotor
A flexbeam rotor system includes an intermediate tube and a torque tube that envelopes a flexbeam in spaced relation thereto. The torque tube is connected to the flexbeam at its radially outer end...
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6659722 |
Composite rotor blade and method of manufacture
The present invention comprises a rotor blade and method of manufacture thereof. The rotor blade of the present invention incorporates a number of novel features in order to increase its...
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6607357 |
Aircraft constant-velocity transmission rotor
An aircraft rotor having a drive shaft, a number of blades extending substantially radially with respect to the shaft, and a constant-velocity transmission connecting the blades to the shaft; the...
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6527515 |
Rotor for rotary wing aircraft
A rotor for rotary wing aircraft includes a number of features that reduce the collective forces required to control the pitch of the rotor. The spar caps of the spar become joined to one another...
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6514043 |
Wind turbine hub
The present invention relates to a hub assembly of a rotor for holding at least one wing, wherein the at least one wing is connected/mounted to the hub assembly in at least two suspension points....
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6439849 |
Dual trunnion hub-to-mast assembly
The present invention comprises an apparatus for mounting two or more tail rotor hubs to a tail rotor mast. The apparatus comprises a mast having an externally-splined inboard section shaped and...
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6413048 |
Elastomeric bearing
An elastomeric bearing for the flapping hinge of a helicopter is disclosed. The elastomeric bearing includes an outer race, an inner race, and an elastomeric element disposed therebetween. The...
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6375426 |
Protective edge members for composite flexures
An edge member for use on a composite flexure having an exposed edge surface. The edge member includes an innermost composite ply attached to the edge surface, an outermost composite ply attached...
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6361278 |
Coupling membrane for a helicopter rotor head
A helicopter gimbal rotor arrangement includes a drive shaft with a rotor hub, a rotor blade holder arrangement, and a coupling membrane for transmitting the rotational drive moment from the rotor...
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6305640 |
Spring component and support bearing for helicopter tail rotors and support structure for use in outer space
A spring component for support bearings of helicopter tail rotors or for support structures for use in outer space encompasses at least two contact support components (11a, 11b) for connecting with...
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6296444 |
Prop rotor hub
A prop rotor hub includes a constant velocity joint in the same plane as a prop blade yoke. Torque is transmitted from a shaft to the blades through the CV joint, hub plates attached to the CV...
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6287076 |
Rotor blade, in particular for helicopter antitorque tail rotor
A rotor blade, in particular for a helicopter anti-torque tail rotor, includes a rotable blade shank mounted in a rotor hub, which allows the blade to rotate about its step axis (P--P). The rotor...
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6280141 |
Swash-plates system for control of the pitch of rotor blades with rotating plate driver
The rotating plate of the system is fixed in rotation with the rotor by a driver with two rigid driving tracks extending axially and diametrically opposite in being fixed in rotation with the...
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6260676 |
Magnetic particle damper apparatus
A magnetic particle damper apparatus is provided for damping motion between two relatively movable members. The damper apparatus comprises first and second conductor members each attachable to one...
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6203277 |
Gyroplane rotor with double-plate hub and external pitch control
A rotorcraft, in particular helicopter, rotor includes a tubular pylon driven in rotation about its axis, which is the rotation axis of the rotor, from its foot. A hub is attached to the pylon by a...
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6196800 |
Rotor blade for a bearingless rotor of a helicopter
A rotor blade arrangement for a bearingless rotor of a helicopter includes a flexbeam connecting an airfoil blade to a rotor head, and a control sleeve surrounding the flexbeam. The control sleeve...
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6176679 |
Rotor with folding blades, for the rotary wings of an aircraft
The rotor comprises a hub 2 rotated with a mast 1 about an axis of the rotor ZZ, and each blade 3 is connected to the hub 2 by a member 5 on which the blade 3 is mounted so that the blade 3 can...
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6164915 |
Simplified anti-vibration suspension device for a helicopter
The anti-vibration suspension device includes at least three diagonal bars each articulated on the transmission box and on the structure by a rigid lever supporting a damping weight itself...
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6155784 |
Variable pitch aircraft propeller
A propeller for aircraft has a tip-to-tip flex-beam spar and torsionally stiff hollow blades bonded to the spar throughout an outer portion of the blades. The spar has two end caps which are...
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6152696 |
Swash-plate device for controlling the pitch of rotor blades with non-rotating plate articulated on a central ball joint
The swash-plates are oscillating mounted by the non-rotating plate on a central ball joint sliding axially around a guide fixed to the structure and on which the ball joint is locked from rotation...
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6139271 |
Helicopter rotor blade weighting
Rotor blade weighting apparatus comprising in combination at least one elongated rod carried within a rotor blade, and multiple weights received and retained on the rod, the number of weights...
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6126398 |
Two-piece rotor blade for a bearingless rotor of a helicopter
A rotor blade for a bearingless rotor of a helicopter includes a lift-generating airfoil blade, a flexbeam connecting the airfoil blade to a rotor head, and a control sleeve enclosing the flexbeam....
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6120251 |
Rotorcraft rotor with fixed flap stops on blades and hub, and with determined pitch-flap law
The rotor comprises, for each blade, an inner and an outer flap stop which are fixed to the blade and have a bearing surface which is planar with a cylindrical portion, facing an inner and an outer...
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6113352 |
Hingeless rotor with precompressed half-bearings supporting blade root oversleeves on torsionable blade root strips
Each blade of the rotor has a rigid root oversleeve connected to a torsionable and flexible root strip by two laminated, spherical support half bearings, fixed by their outer frame with double...
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6099254 |
Helicopter rotor blade control device
In a helicopter having three or more rotor blades, and with mechanical actuation of the rotor blades by a swash plate and a superimposed electrohydraulic active control system, in addition to three...
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6050778 |
Semi-articulated rotor system
A semi-articulated stiff-in-plane (SASTIP) rotor hub is provided. The hub includes a cylindrical composite shell (12). A plurality of flexure mount assemblies (16) are positioned around the...
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6045328 |
Fluid damper including flexible damping plate
A fluid and elastomer damper includes a first and second members and an elastomer section flexibly mounting the second member to the first member and allowing lateral movement therebetween. The...
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