• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present invention relates to a rotor (2) having a hub (3) and a plurality of lift assemblies, said rotor (2) having a lift stop drag mechanism (20) (10). Each abutment mechanism (20) comprises an elastomer shim (30) and two C-shaped metal riders (40) respectively fitted on a first base (32) and a second base (33) of the shim. Two fixing pins (50) each pass through a jumper (40) and longitudinal projections (35,36) of a base (32,33) and a hub hole.
    公开号:FR3020341A1
    申请号:FR1400961
    申请日:2014-04-24
    公开日:2015-10-30
    发明作者:Stephane Mazet；Sandra Bencardino
    申请人:Airbus Helicopters SAS；
    IPC主号:
    专利说明:

    [0001] The present invention relates to a rotor comprising a drag stop mechanism, and an aircraft provided with such a rotor. The invention is therefore in the technical field of rotorcraft rotors. More specifically, the invention lies in the field of stops fitted to such rotors for limiting the drag movement of the lift assemblies carried by the hub of this rotor. Indeed, a rotorcraft usually comprises at least one rotor to ensure at least in part the lift or propulsion of this rotorcraft. A rotor comprises a hub rotated by a mast. The hub then carries at least two lift assemblies. As a result, each lift assembly is provided with a blade connected to the hub by at least one retention and mobility member. Each blade may in particular comprise a lift element attached to a sleeve or a lift element provided with an integrated sleeve. For example, a restraint and mobility member includes a hinge referred to as a "spherical abutment". Each spherical abutment may have a frame attached to the hub and a frame attached to a sleeve, whether or not this sleeve is integrated with a lift element. The blades are thus substantially plane elongated members which are carried by the hub. The mounting of the blades on the hub is provided by individual mounting members of the blades on the hub which include the retaining members and mobility connecting the lift assemblies to the hub.
    [0002] The hub may be a plate hub provided with two plates integral with a mast. For example, a frame of a retaining member and mobility is fixed to the trays by a pin.
    [0003] According to another embodiment, the hub may comprise a single plate attached to the mast, this plate being provided with radial arms having openings. A retention and mobility member is optionally positioned in each opening, being secured to the plate by a frame. A sleeve then extends on either side of the plate extending from the retaining member and mobility to a lift element. The mounting members respectively equip each of the blades at their root to allow their maneuvering by an operator. The movable mounting of the blades on the hub makes it possible, for example, for a rotorcraft pilot to operate in flight collective or cyclic variations of the pitch of the blades to influence the behavior of the rotorcraft with regard to its lift and / or propulsion. The mobility of the blades on the hub allows their movement in drag, step and beat. For the control of the pitch, the sleeve may further comprise a spacer articulated to a pitch lever connected to a control device for controlling the pitch of the blade. Maneuvering the control device induces a translation of the pitch lever, this translation making it possible to modify the pitch of the blade. Under these conditions, the drag movement of the blade can induce an impact between the hub and the sleeve of a blade, and in particular with its pitch lever.
    [0004] In addition, some rotors are equipped with inter-blade drag adapters extending between two adjacent blades. For these rotors, the collective drag mode is not, however, cushioned by the drag adapters. Therefore, a manufacturer may be encouraged to protect the hub against shocks occurring as a result of a collective drag movement of the lift assemblies, in particular during the starting and stopping phases of the rotor relating respectively to acceleration and deceleration phases. .
    [0005] EP 0340 095 discloses a hub with bosses having drag stop surfaces opposite blade stop surfaces. The drag stop surfaces are slightly curved with a double curvature. Also known are "martyr" metal stops arranged on the hub arms carrying the blades. Two metal stops per blade are arranged on the hub to serve as stops following a drag movement of a blade in two opposite directions of rotation. Each metal stop has the shape of a jumper fixed to the end of the arm so as to be opposite a sleeve. Instead of impacting the hub as a result of a drag movement, a lift assembly can abut against a drag stop. However, such a metal stop may be difficult to set up on a composite material hub. Indeed, a composite material hub may have manufacturing dispersions compared to a theoretical definition. Therefore, the actual geometry of a composite material hub can make it difficult to arrange a metal drag stop sized from a theoretical shape of the hub. In addition, the end of the arm may have a complex shape, for example truncated cone. A metal abutment can be difficult to adapt to such a complex shape, the implementation being all the more difficult in case of hub manufacturing dispersions. In addition, the impact of a lift assembly on a metal abutment generates a peak of local effort, risking local delamination of a hub made of composite materials. Documents US Pat. No. 4,235,570 and US Pat. No. 4,003,708 describe a helicopter rotor provided with blades articulated to a hub by a retaining and mobility member of the spherical abutment type. In addition, each blade is connected to an arm of the hub by a jack limiting the drag movement of a blade. Such movement is restricted to an angular field between a first position in which the cylinder is completely retracted and a second position in which the cylinder is fully extended. US 4,551,067 discloses a rotor with retractable drag abutments. US 4 297 079 is not present in the technical field of rotorcraft rotors. Indeed, this US Pat. No. 4,297,079 shows a marine propeller. The present invention therefore relates to an alternating rotor provided with a stop mechanism for limiting the drag movement of a lift assembly, in particular for a rotor comprising a hub made of composite materials.
    [0006] According to the invention, a particular rotorcraft rotor is provided with a hub and a plurality of lift assemblies, each lift assembly having a retention and mobility member connected to an arm of the hub to articulate the lift assembly to the hub, for example around three directions of rotation. The rotor includes a stopper mechanism per lift assembly for protecting the hub as a result of a drag movement of the lift assembly, said arm having an end having an upper face and a lower face which are connected by a wafer. look of a lift set. Each stop mechanism of a lift assembly comprises: an elastomer wedge provided with a central section extending transversely from a first base towards a second base along said wafer, each base having a central portion integral with the central section, the central section being disposed against said wafer and extending in elevation from a lower longitudinal projection disposed against the lower face to an upper longitudinal projection disposed against the upper face so as to have a shape of C, - two jumpers C-shaped metal fittings respectively on the first base and the second base, - two fixing pins each passing through a jumper and the two longitudinal projections of a base and an opening of said arm extending in elevation from the lower face to the upper face.
    [0007] The rotor is then provided with a stop mechanism composed of a metal part comprising two jumpers and an elastomer part comprising a single shim. Therefore, the elastomer wedge is fitted on the end of an arm of a hub. Such an elastomer wedge makes it possible to obtain shapes that can be difficult to achieve with a metal jumper. The wedge being made from an elastomer. This wedge thus has a flexibility facilitating its arrangement, and allows its adaptation to a composite material hub possibly having a manufacturing dispersion compared to the definition of a theoretical hub. A stop mechanism of the same type can then be arranged on multiple hubs.
    [0008] This ability to adapt can also offer more dimensional margins when manufacturing hubs. Such a wedge may in particular be arranged on an arm having an end in the form of double truncated cones. The shim may have an H-shape or a rectangular shape seen from the front, namely according to a radius of the rotor. On the other hand, the wedge has a shape of C seen from the side, namely in a direction tangential to the rotor. The stop mechanism further comprises two metal jumpers fitted on the wedge. This mechanism is then fixed to the hub by the fixing pins, each fixing pin being a tightening means including tightening the longitudinal projections of the wedge against the upper face and the lower face of an arm.
    [0009] This attachment is moreover reversible, which makes it possible to change if necessary at least one jumper or the wedge of the stop mechanism. Following an extreme drag movement in a first direction, the lift assembly abuts against a first rider. Following an extreme drag movement in a second direction, the lift assembly abuts against a second rider. During such an impact, the elastomer wedge damps this impact and distributes the force exerted by the rider impacted on a large area of the slice, namely the surface of the base capped by the impacted rider. This characteristic tends to avoid the generation of a peak of local effort to limit the risk of delamination of a composite material hub for example.
    [0010] Therefore, the stop mechanism can be used to limit the risk of delamination of a hub when a lift assembly abuts against a rider. In addition, the elastomer wedge makes it possible to tolerate manufacturing dispersions. This abutment mechanism is then a relatively simple mechanism, and in fact possibly inexpensive. The rotor may further include one or more of the following additional features. In particular, the hub may be made of composite materials. The hub may in fact be composed of a multitude of fabric layers such as carbon fabrics that are hot-compressed with a resin. In the hub manufacturing mold, only large openings are possible, openings that correspond to the cells for arranging the retaining members and mobility. For the passage of some axes, holes are achievable by a "classic" machining. For example, each fixing pin comprising a bolt 5 provided with a head and a nut, the mechanism comprises two washers per fixing axis disposed respectively between a head of the fixing pin and a longitudinal projection of a base as well as between a nut of the fixing pin and the other longitudinal projection of this base, each washer being arranged in an oblong hole 10 of a jumper allowing a displacement of this jumper approaching the hub following a shock . To participate in the damping and maintain the riders on the hub, the attachment pin is equipped with two washers that compress the elastomer wedge. These washers are thus placed under the head and under the nut. Each rider then has oblong holes in which the washers can slide. Therefore, following an impact with a lift assembly, a rider can move slightly relative to the hub. This movement 20 makes it possible to dampen the impact of the impact on the rider by crushing the elastomer wedge between the rider and the edge of an arm of the hub. In addition, these machining of oblong shape of the bores of the riders reduce the risk of shearing the fixing pins 25 following an impact on a rider. Furthermore, said end of an arm may have two distinct profiles to the right of the first base and the second base of a shim. The first base and the second base are then different, said two jumpers being identical.
    [0011] Due to a frustoconical shape, for example, of one end of an arm and of the eccentricity of the pitch axis of the lift assembly, the thicknesses of the hub to the right of the two jumpers of the same mechanism can be different.
    [0012] This difference is compensated by the use of a wedge comprising different bases. Therefore, the two jumpers can be identical which simplifies the stop mechanism and reduces its machining cost. In addition, the elastomer wedge is naturally polarized, which facilitates its arrangement on the end of an arm of a hub. On the other hand, at least one longitudinal projection may be tapered, said longitudinal projection tapering in a longitudinal direction from said central section to a hub rotation axis. This feature facilitates its arrangement on a conical arm. Moreover, at least one rider can be force-fitted on a base of said shim. The rider is then mounted on a shim by slightly compressing the elastomer of this shim so as to prevent the presence of games. Furthermore, at least one rider may comprise a central portion disposed against the central portion of a base of said shim, the rider having two branches integral with the central portion which are arranged against the longitudinal projections of this base, this central portion having an outgrowth facing the lift assembly, this protrusion having the shape of a cylindrical portion of a cylinder whose axis of symmetry is substantially parallel to the edge of an arm so that an impact with a lift assembly occur in a generatrix cylinder regardless of a beat angle of the lift assembly. In particular, the axis of symmetry is possibly coincident with the beat axis of a lift assembly. This feature aims to obtain a substantially constant maximum drag angle irrespective of the beat angle of the lift assembly. Furthermore, the stop mechanism may comprise at least one additional abutment surface reversibly fixed on a lift assembly so as to abut against a rider from a threshold drag angle. The abutment surface then represents a martyred piece of a lift assembly that can be replaced. Such an abutment surface is optionally metallic. Furthermore, the abutment surface may comprise a protuberance facing a rider, said protuberance having the shape of a cylindrical cylinder portion. The additional abutment surface may also be in the form of an arc of a circle centered on a pitch axis of the lift assembly. This feature is intended to allow contact with a jumper regardless of the pitch angle of the lift assembly.
    [0013] In addition, when a lift assembly comprises a spacer articulated to a pitch lever, this spacer can carry at least one abutment surface. For example, the spacer has two abutment surfaces cooperating each respectively with a jumper following a drag movement in two opposite directions. In addition to a rotor, the invention relates to an aircraft of the type described above, in particular a rotorcraft. The invention and its advantages will appear with more details in the context of the description which follows with examples given by way of illustration with reference to the appended figures which represent: FIG. 1, a view of an aircraft rotor according to FIG. 2 is a view of an arm of a hub provided with a drag stop mechanism of a lift assembly; FIG. 3 is a partial exploded view of this mechanism; 4, a section of this mechanism, FIG. 5, a top view of a jumper, FIG. 6, a diagram showing an abutment surface, and FIG. 7, a diagram showing an abutment surface. alternative. The elements present in several separate figures are assigned a single reference. Note that three directions X, Y and Z orthogonal to each other are shown in some figures.
    [0014] The first direction X is called longitudinal. The second direction Y is called transverse. Finally, the third direction Z is said in elevation. FIG. 1 shows a rotor 2 of an aircraft 1, for example a rotor providing at least the lift of a rotorcraft. The rotor 2 is provided with a hub carrying a plurality of lift assemblies 10. Each lift assembly is provided with a blade comprising a lift element 11 and a sleeve 12. FIG. 1 shows a lift element on the sleeve 12 Nevertheless, the sleeve 12 may be a constituent part of the blade. Furthermore, the lift assembly comprises a retaining and mobility member 15 articulating the lift assembly to the hub 3. For example, a retaining member and mobility comprises a laminated member, better known as the "elastomeric spherical abutment" laminated "or simply" spherical abutment ". Therefore, the hub comprises an arm per lift assembly, the retaining member and mobility of a lift assembly being attached to an arm. This retention and mobility member comprises for example a frame attached to an arm, and a frame attached to a sleeve. Thus, the arm may comprise a cell in which a retaining and mobility member is arranged. Such a hub may be a hub made of composite materials. This retention and mobility member gives three degrees of freedom in rotation to the blade, namely a freedom of rotation in a beat around a beat direction and a freedom of rotation in steps around a direction of pitch and a freedom of rotation in drag around a direction of drag. For blade pitch control, this blade may comprise a spacer 70 of the sleeve articulated to a pitch lever 71. In addition, the rotor may comprise inter-blade drag adapters 9, each drag adapter extending from the sleeve of one blade to another adjacent blade. In addition, the rotor comprises at least one stop mechanism for protecting the hub against any impact between a lift assembly following a drag movement of this lift assembly. Each abutment mechanism 20 then limits the drag movement of the lift assembly between two extreme positions. Figure 2 shows an arm 4 of a hub. This arm 4 is provided with an end 5 provided with an upper face 6 and a lower face 7 connected by a wafer 8. The wafer 8 is then facing a lift assembly and in particular the surface 20 of the lift assembly capable of impacting the hub following a drag movement. For example, the slice 8 is opposite a spacer 70 carrying a pitch lever. The end 5 may have a complex shape of double truncated cones, the end 5 forming a cone in a top view 500, and forming another cone in a tangential view 501. The stop mechanism then has a shim 30 in elastomer fitted on the end 5. This wedge 30 is in fact provided with a first base 32 and a second base 33 connected by a central section 31.
    [0015] The central section 31 is substantially flat and disposed against the wafer 8. The central section 31 then extends in elevation and transversely along the wafer 8. On the other hand, each base has a shape of C to jointly grip the upper face 6 as well as the lower face 7 and the slice 8. Thus, each base 32, 33 comprises a substantially plane central section 34 which is pressed against the slice 8 and which is integral with the central section 31. The central section 31 and the section central of the first base 32 and the central section of the second base 33 are substantially present in the same elevation plan called "plan of attachment" for convenience. In addition, each base comprises two longitudinal projections 35, 36 present at two ends of the central section 34 of this base. As a result, each base has a lower longitudinal projection 35 extending from the central section to an axis of rotation AX of the hub being disposed against the lower face 7 of the hub. Similarly, each base has an upper longitudinal projection 36 extending from the central section to an axis of rotation AX of the hub being disposed against the upper face 6 of the hub. Each longitudinal projection of a base is substantially perpendicular to the plane of attachment, and therefore to the central section 25 of the base. In addition, the stop mechanism is provided with two metal riders 40 each covering a base 32, 33 of the shim 30.
    [0016] Thus, the two jumpers have a shape of C to be fitted respectively to the first base 32 and the second base 33. Each rider 40 represents a martyred surface impacted by a lift 5 following a rotation of the lift assembly in two opposite directions. A jumper serves as a contact surface when the lift assembly is rotated in a dextral direction, while the other jumper serves as a contact surface when the lift assembly is rotated in a counter-clockwise direction. Furthermore, the stop mechanism comprises two fixing pins 50. Each fixing pin passes through each a rider 40 as well as the two longitudinal projections 35, 36 of a base 32, 33 and an orifice of the arm 4. FIG. 3 is an exploded view showing the wedge and the two jumpers of a stop mechanism. According to this Figure 3, the end 5 of a hub may have different thicknesses to the right of the location of the two riders. Thus, the slice 8 may for example have a first thickness E1 at the location of a first base of the hold, and a second thickness E2 at the location of a second base of the hold. The first thickness E1 and the second thickness E2 are then different. Therefore, the first base 32 and the second base 33 are favorably geometrically different. For example, the first base may have longitudinal projections thicker than the longitudinal projections of the second base.
    [0017] Indeed, the first base and the second base can be shaped to allow the use of two identical jumpers 40. To arrange the mechanism 20, an operator then moves the bases of the shim on the end of the arm, so that the central section 31 and the central sections 34 of the bases are in contact with the slice 8. Each upper longitudinal projection 36 then rests on the upper face 6 of the arm, and each lower longitudinal projection 35 is disposed against the lower face 7 of the arm. In addition each longitudinal projection has a bore vis-à-vis an orifice 600 of the arm. The elastomer structure of the wedge makes it possible to tolerate dimensional dispersions for manufacturing the hub relative to a theoretical definition of the hub. As a result, the operator puts each jumper on a base. For example, each rider is force-fitted to prevent the presence of a game. Therefore, a central portion 41 of a rider is disposed against the central portion 34 of a base 32, 33 of said shim 30, this rider 40 having two branches 42, 43 integral with the central portion 4. These two branches are arranged against the longitudinal projections 35, 36 of this base 32, 33. The face of the central portion of a rider disposed against the central section 34 d a base can be favorably flat. Similarly, the face of the central portion of a base disposed against the central portion of a rider may be favorably flat. In addition, each branch has a hole disposed opposite an orifice 600 of the arm.
    [0018] With reference to FIG. 4, the operator then inserts an attachment pin 50 into each orifice 600. Each fixing pin is provided with two washers and a bolt 51 provided with a head 52 and a nut 54 for tighten the stop mechanism against the hub arm. Therefore, the rod 53 of the bolt passes through the two holes 45, 46 of the branches of a jumper and the two holes of the longitudinal projections of a base and an orifice 600. A washer 55 traversed by this rod is clamped between the 10 head 52 of the bolt and a longitudinal projection 36 of a base, and the other washer 56 is clamped between a nut 54 and the other longitudinal projection 35 of this base. In addition, each hole of a jumper can be an oblong hole. With reference to FIGS. 4 and 5, each washer 55, 56 is then arranged in an oblong hole 45, 46 of a jumper 40. This characteristic allows the radial displacement of this jumper enabling it to approach the hub 3 following a shock. With reference to FIG. 4, at least one longitudinal projection 35, 36 may be tapered to compensate for the frustoconical profile of the end of the hub arm. Thus, such a longitudinal projection 35,36 thins starting from the central section 34 while moving towards an axis of rotation of the hub. Furthermore, the central portion 41 of a shim may include an outgrowth 44 opposite the lift assembly 10, and in particular the surface of the lift assembly capable of impacting a hub. This protrusion 44 has the shape of a cylindrical portion 403 of a cylinder 401 whose axis of symmetry 402 is substantially parallel to the edge 8 of an arm. More particularly, this axis of symmetry can be confused with a beat axis of the lift assembly facing the outgrowth. In addition, the shim 30 may be a molded part. To avoid form interference between the angle formed for example by the faces 6 and 8 of the hub 3, molding is carried out with a bead 300 in the junction zone between a longitudinal projection 36 and the central portion 34 of the shim 30. With reference to FIG. 6, the abutment mechanism 20 may comprise at least one additional abutment surface 60 reversibly fixed to a lift assembly 10. For example, the mechanism has an additional abutment surface per rider intended to impact this rider. Such a stop surface 60 is optionally metallic. In addition, the abutment surface 60 can be reversibly attached to a spacer 70 articulated to a pitch lever. In addition, like a jumper, the abutment surface 60 may comprise a protuberance 61 opposite a rider 40. This protuberance may have the shape of a cylindrical portion 62 of a cylinder 63. The axis of symmetry of this cylinder 63 is possibly parallel to the beat axis of the lift assembly equipped with the abutment surface. Referring to FIG. 7, the additional abutment surface may be in the form of a circular arc 64 centered on the pitch axis AX1 of the lift assembly carrying that additional abutment surface. The abutment surface may be flat or have a protuberance.
    [0019] Naturally, the present invention is subject to many variations as to its implementation. Although several embodiments have been described, it is well understood that it is not conceivable to exhaustively identify all the possible modes. It is of course conceivable to replace a means described by equivalent means without departing from the scope of the present invention.
    权利要求:
    Claims (14)
    [0001]
    REVENDICATIONS1. Rotor (2) having a hub (3) and a plurality of lift assemblies (10), each lift assembly (10) having a retention and mobility member (15) connected to an arm (4) of the hub (3) for articulating the lift assembly (10) to the hub (3), said rotor (2) having a stop mechanism (20) per lift assembly (10) for protecting the hub (3) following a movement in drag of the lift assembly (10), said arm (4) having an end (5) provided with an upper face (6) and a lower face (7) which are connected by a slice (8) facing of a lift assembly (10), characterized in that each stop mechanism (20) of a lift assembly (10) comprises: - an elastomer shim (30) provided with a central section (31) extending transversely of a first base (32) to a second base (33) along said wafer (8), each base (32, 33) having a central section (34) integral with the central section (31), the third central portion of each base being disposed against said wafer (8) and extending in elevation from a lower longitudinal projection (35) disposed against the lower face (7) to an upper longitudinal projection (36) disposed against the upper face ( 6) so as to have a C shape, - two C-shaped metal jumpers (40) respectively fitted on the first base (32) and the second base (33), - two fixing pins (50) each passing through a jumper (40) as well as the two longitudinal projections (35,36) of a base (32, 33) and an orifice (600) of said arm (4) which extends in elevation from the lower face (7) to the face superior (6).
    [0002]
    2. Rotor according to claim 1, characterized in that each fixing pin (50) comprising a bolt (51) provided with a head (52) and a nut (54), said mechanism (20) comprises two washers (55, 56) per fixing pin (50) respectively arranged between a head (52) of the fixing pin (50) and a longitudinal projection (35, 36) of a base (32, 33) and between one nut (54) of the fixing pin (50) and the other longitudinal projection (36, 35) of this base (32, 33), each washer (55, 56) being arranged in a hole (45, 46) oblong a jumper (40) allowing a movement of this jumper approaching the hub (3) following a shock.
    [0003]
    3. Rotor according to any one of claims 1 to 2, characterized in that, said end (5) having two distinct profiles to the right of the first base (32) and the second base (33), the first base ( 32) and the second base (33) are different, said two jumpers (40) being identical.
    [0004]
    4. Rotor according to any one of claims 1 to 3, characterized in that at least one longitudinal projection (35,36) is tapered, said longitudinal projection (35,36) tapering in a longitudinal direction starting from said central portion (34) to an axis of rotation (AX) of the hub (3).
    [0005]
    5. Rotor according to any one of claims 1 to 4, characterized in that at least one rider (40) is force-fitted on a base (32, 33) of said shim (30).
    [0006]
    6. Rotor according to any one of claims 1 to 5, characterized in that said hub (3) is made of composite materials.
    [0007]
    7. Rotor according to any one of claims 1 to 6, characterized in that at least one rider (40) has a central portion (41) disposed against the central section (34) of a base (32, 33). said wedge (30), said rider (40) having two limbs (42, 43) integral with the central portion (41) which are arranged against the longitudinal projections (35, 36) of said base (32, 33), said central portion (41) having an outgrowth (44) opposite the lift assembly (10), said protrusion (44) having the shape of a cylindrical portion (403) of a cylinder (401) whose axis of symmetry is substantially parallel to said wafer (8) for an impact with a lift assembly (10) to occur along a generatrix (400) of said cylinder regardless of a beat angle of the lift assembly (10).
    [0008]
    8. Rotor according to claim 7, characterized in that said axis of symmetry coincides with a beat axis of a lift assembly.
    [0009]
    9. Rotor according to any one of claims 1 to 8, characterized in that the abutment mechanism (20) comprises at least one additional abutment surface (60) reversibly fixed to a lift assembly (10) in such a manner that abutting a rider (40) from a threshold drag angle.
    [0010]
    10. Rotor according to claim 9, characterized in that said abutment surface (60) is metallic. 25
    [0011]
    11. Rotor according to any one of claims 9 to 10, characterized in that said abutment surface (60) comprises a protuberance (61) opposite a rider (40), said protuberance (61) having the shape of a cylindrical portion (62) of cylinder (63).
    [0012]
    12. Rotor according to claim 9, characterized in that said additional abutment surface (60) has the shape of a circular arc (64) centered on a pitch axis (AX1) of said lift assembly.
    [0013]
    13. Rotor according to any one of claims 9 to 12, characterized in that a lift assembly (10) comprises a spacer (70) articulated to a pitch lever, said spacer (70) carrying at least one stop surface (60).
    [0014]
    14. Aircraft (1), characterized in that said aircraft (1) comprises a rotor (2) according to any one of claims 1 to 13.15
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    同族专利:
    公开号 | 公开日
    US9637228B2|2017-05-02|
    CN105015772B|2017-04-12|
    CN105015772A|2015-11-04|
    EP2937282B1|2016-07-13|
    EP2937282A1|2015-10-28|
    US20150307188A1|2015-10-29|
    FR3020341B1|2016-04-29|
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    EP0340095A1|1988-04-29|1989-11-02|AEROSPATIALE Société Nationale Industrielle|Rotor head having elastic, internally damped return devices between the blades|
    EP0478444A1|1990-09-27|1992-04-01|AEROSPATIALE Société Nationale Industrielle|Rororcraft rotor head|EP3263453A1|2016-06-29|2018-01-03|Airbus Helicopters|A rotor and an aircraft provided with such a rotor|US3932059A|1975-01-10|1976-01-13|United Technologies Corporation|Droop stops for helicopter rotor having elastomeric bearings|
    US4235570A|1978-06-26|1980-11-25|United Technologies Corporation|Elastomeric helicopter rotor load reaction system|
    US4203708A|1978-06-26|1980-05-20|United Technologies Corporation|Elastomeric rotor load reaction system|
    FR2458457B1|1979-06-05|1983-05-27|Aerospatiale|
    US4297079A|1980-07-14|1981-10-27|Goodall Semimetallic Hose & Mfg. Co.|Variable pitch marine propeller|
    IT1155133B|1982-03-11|1987-01-21|Agusta Aeronaut Costr|HELICOPTER ROTOR|
    IT1182447B|1985-02-19|1987-10-05|Agusta Aeronaut Costr|HELICOPTER ROTOR|
    FR2750948B1|1996-07-12|1998-10-30|Eurocopter France|DEVICE FOR LOCKING, AT LEAST IN STEP, THE BLADES OF A ROTOR|
    GB9824075D0|1998-11-05|1998-12-30|Mckrill Nigel H|Rotor|
    US8919692B2|2009-04-28|2014-12-30|Sikorsky Aircraft Corporation|Proximity sensor valve and lock system using same|
    US9039373B2|2011-12-14|2015-05-26|Textron Innovations Inc.|Blade-pitch control system with feedback lever|FR3056554B1|2016-09-29|2018-08-31|Airbus Helicopters|STOPPER OF A BLADE|
    US10343772B2|2017-07-10|2019-07-09|Bell Helicopter Textron Inc.|Pitch horn assembly|
    US10752346B2|2017-10-18|2020-08-25|Textron Innovations Inc.|Rotor assembly with composite static mast|
    EP3755623A1|2018-05-08|2020-12-30|AVX Aircraft Company|Rotor hub|
    法律状态:
    2015-03-19| PLFP| Fee payment|Year of fee payment: 2 |
    2015-10-30| PLSC| Search report ready|Effective date: 20151030 |
    2015-10-30| EXTE| Extension to a french territory|Extension state: PF |
    2016-04-21| PLFP| Fee payment|Year of fee payment: 3 |
    2017-04-19| PLFP| Fee payment|Year of fee payment: 4 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1400961A|FR3020341B1|2014-04-24|2014-04-24|ROTOR COMPRISING A TRAINING MECHANISM, AND AIRCRAFT|FR1400961A| FR3020341B1|2014-04-24|2014-04-24|ROTOR COMPRISING A TRAINING MECHANISM, AND AIRCRAFT|
    EP15155949.9A| EP2937282B1|2014-04-24|2015-02-20|A rotor including a lead/lag abutment mechanism, and an aircraft.|
    US14/682,338| US9637228B2|2014-04-24|2015-04-09|Rotor including a lead/lag abutment mechanism, and an aircraft|
    CN201510198884.0A| CN105015772B|2014-04-24|2015-04-22|Rotor including a lead/lag abutment mechanism, and an aircraft|
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