A rotorcraft hub system and a rotorcraft

Abstract

The present invention relates to a rotor hub system and a gyroplane, belonging to the technical field of flight equipment, and solves the problems of numerous parts and poor reliability of the rotor hub in the prior art. The present invention includes a constant velocity joint, a support arm assembly, a flapping assembly, and a centrifugal assembly; the constant velocity joint is arranged at the center of the rotor hub system, the constant velocity joint is sleeved and connected to the rotor shaft, and can rotate around its axis along with the rotor shaft; one end of the support arm assembly is hinged to the constant velocity joint, and the support arm assembly can perform flapping motion along the axis of the constant velocity joint; the flapping assembly is hinged to the side of the support arm assembly, and the flapping assembly can perform left and right flapping motion in a plane perpendicular to the axis of the constant velocity joint; the centrifugal assembly is connected to the other end of the support arm assembly, and the centrifugal assembly can rotate under the drive of the pitch change rocker to achieve pitch change motion. The present invention reduces the number of parts of the rotor hub system and improves the reliability and stability of the system.

Description

Technical Field

[0001] The present invention relates to the technical field of flight equipment, and in particular to a rotor hub system and a gyroplane of a gyroplane. Background Art

[0002] For a gyroplane, the rotor hub system is a connecting structure of a transmission shaft, rotor blades and a control system, which can transmit the power of the transmission shaft, transmit the commands of the control system to control the flapping, pitch change and flutter of the rotor blades, and bear the reaction forces of the rotor blades in three directions. Therefore, the rotor hub system is the core structure for realizing various maneuvers such as flight, speed change, turning, pitching, etc. of the gyroplane.

[0003] The first-generation rotor hub system is realized by a metal structure and hinges in three directions. It has a large number of structures, a large weight, and poor bearing reliability; the second generation is a flexible bearing rotor hub, which uses elastic materials to replace metal bearings, and the pitch change, flapping and flutter movements are all realized by the flexible material structure. The design of the flexible material structure is difficult, the reliability is not high, and the requirements for material technology are high; the third generation is a bearingless rotor hub, which uses elastic parts to offset the movements in three directions. Represented by the Black Hawk, the disadvantage is that there are still many parts and it is a bit bulky; the fourth generation is a central elastic universal hinge rotor hub, which realizes the flapping and flutter movements through a central universal hinge, and combines a centrifugal bearing and a pitch change bearing through a large star-shaped part to realize the transmission of pitch change and centrifugal force. The typical representative is V280. However, the design and verification of the central elastic part and the star-shaped part are both difficult, and it is difficult for small enterprises and even most countries to complete the whole process. Summary of the Invention

[0004] In view of the above analysis, embodiments of the present invention aim to provide a rotor hub system and a gyroplane of a gyroplane to solve the problems of many parts, difficult design, complex manufacturing process and poor reliability of the rotor hub of the gyroplane in the prior art.

[0005] The object of the present invention is mainly achieved by the following technical solutions:

[0006] One aspect of the present invention provides a rotor hub system of a gyroplane, including a constant velocity joint, a support arm assembly, a flutter assembly, a centrifugal assembly and a sleeve assembly;

[0007] The constant velocity joint is arranged at the center of the rotor hub system. The constant velocity joint is sleeved and connected to the rotor shaft and can rotate around its axis along with the rotor shaft;

[0008] The support arm assembly is circumferentially arranged along the outer edge of the constant velocity joint; one end of the support arm assembly is hinged to the constant velocity joint, and the support arm assembly can realize flapping movement along the axis of the constant velocity joint;

[0009] The flapping assembly is hinged to the side of the support arm assembly, and the flapping assembly can perform left and right flapping motions in a plane perpendicular to the axis of the constant velocity joint;

[0010] The centrifugal assembly is connected to the other end of the support arm assembly, and the centrifugal assembly can rotate under the drive of the pitch change rocker arm to achieve pitch change motion.

[0011] Furthermore, a spline key groove is provided at the center of the constant velocity joint for connecting the rotor shaft; a plurality of first connecting parts are circumferentially and equiangularly arranged on the outer edge of the constant velocity joint; the first connecting parts are used for hinging the support arm assembly, and a first hinge shaft is provided at the hinged part.

[0012] Furthermore, the flapping assemblies and the support arm assemblies are alternately arranged to form an annular chain structure around the axis of the constant velocity joint.

[0013] Furthermore, the flapping assembly includes at least one flapping elastic member, and both ends of the flapping elastic member are respectively hinged to two adjacent support arm assemblies, and a second hinge shaft is provided at the hinged part.

[0014] Furthermore, the first hinge shaft and / or the second hinge shaft is an elastic member.

[0015] Furthermore, the flapping elastic member includes a flapping part arranged in the middle and hinge parts symmetrically arranged at both ends;

[0016] The flapping part is an elastic body, and the elastic body has an elastic stiffness along its own axis;

[0017] The hinge part can form a hinge structure with the side of the support arm assembly.

[0018] Furthermore, a sleeve is further included;

[0019] The sleeve includes a centrifugal connection part, and the centrifugal connection part is sleeved and connected to the outside of the centrifugal assembly and can drive the centrifugal assembly to rotate to achieve pitch change;

[0020] The pitch change rocker arm is arranged on one side of the end of the centrifugal connection part.

[0021] Furthermore, a flapping elastic member is further included; one end of the flapping elastic member is connected to the constant velocity joint, and the other end is connected to the support arm assembly;

[0022] and / or the centrifugal assembly includes a centrifugal elastic member; the centrifugal elastic member is arranged at the end of the support arm assembly.

[0023] Furthermore, the initial central positions of the constant velocity joint, the support arm assembly, the flapping assembly and the centrifugal assembly are in the same plane.

[0024] The present invention also provides a gyrocopter, including the gyrocopter hub system described above.

[0025] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0026] (1) Compared with the prior art, in the present invention, a constant velocity joint is arranged to be connected with the rotor shaft to realize synchronous rotation with the rotor shaft; the arm assembly is hinged with the constant velocity joint to realize flapping motion; the flapping assembly is hinged with the arm assembly to realize flapping motion; the centrifugal assembly is connected with the arm assembly, and the centrifugal assembly rotates under the drive of the control system connecting rod connected with the pitch change rocker arm to realize pitch change motion. Compared with the existing hub system, the present invention respectively adopts a hinged manner to realize flapping and flapping, and realizes pitch change through the centrifugal assembly, without the need for a large star-shaped part for combination, reducing the number of structural parts and the design and manufacturing difficulty.

[0027] (2) The arm assemblies are arranged outside the constant velocity joint at equal angles and are hinged through elastic hinge shafts; both ends of the flapping elastic member are hinged to the arm assembly through elastic hinge shafts. Compared with the ordinary hinge shafts in the prior art, the elastic hinge shafts do not require lubrication, and when used for hinging between components, they have less vibration and higher reliability than ordinary hinge shafts.

[0028] (3) In the flapping motion, one end of the flapping elastic member is in tension and the other end is in compression. However, due to the elastic action of the elastic body, the elastic member will not be damaged due to stretching, improving the safety of the system. And the flapping elastic member is an independent part, which is convenient for replacement and maintenance.

[0029] (4) Compared with the prior art, in the present invention, the flapping assembly and the arm assembly are alternately connected to form an annular chain structure centered on the constant velocity joint to realize overall flapping. The elastic member can absorb the impact and vibration during flapping, cancel out the forces generated by flapping, reduce the dynamic balance amount, and make the system operate more smoothly.

[0030] (5) The centrifugal connection part of the sleeve drives the centrifugal assembly to rotate. The pitch change rocker arm is arranged on one side of the end of the centrifugal connection part of the sleeve. The sleeve rotates to realize pitch change through the up and down movement of the control system connecting rod connected to the pitch change rocker arm, and the operation is simple and convenient.

[0031] (6) The arm assembly of the present invention includes a flapping elastic member, and the centrifugal assembly includes a centrifugal elastic member; the flapping elastic member is a component for realizing the flapping of the arm, and the centrifugal elastic member is a component for realizing the pitch change of the sleeve.

[0032] (7) In the initial state, the central initial positions of the constant velocity joint, the arm assembly, the flapping elastic member, the centrifugal assembly and the sleeve assembly are in the same plane, which is convenient for installation and positioning.

[0033] In the present invention, the above technical solutions can also be combined with each other to achieve more preferred combined solutions. Other features and advantages of the present invention will be described in the following content. Moreover, some advantages can be made obvious from the specification or understood by implementing the present invention. The objectives and other advantages of the present invention can be achieved and obtained from the content specifically pointed out in the text and the drawings. Description of the Drawings

[0034] The drawings are only for the purpose of showing specific embodiments and are not considered to be a limitation of the present invention. Throughout the drawings, the same reference signs denote the same components.

[0035] Figure 1 Structural schematic diagram of the hub system in a specific embodiment;

[0036] Figure 2 Structural schematic diagram of the connection structure of the hinge shaft in a specific embodiment;

[0037] Figure 3 Structural schematic diagram of the constant velocity joint in a specific embodiment;

[0038] Figure 4 Structural schematic diagram of the support arm assembly in a specific embodiment;

[0039] Figure 5 Structural schematic diagram of the multi-directional joint in a specific embodiment;

[0040] Figure 6 Structural schematic diagram of the flapping elastic member in a specific embodiment;

[0041] Figure 7 Structural schematic diagram of the drag elastic member in a specific embodiment;

[0042] Figure 8 Structural schematic diagram of the centrifugal assembly in a specific embodiment;

[0043] Figure 9 Structural schematic diagram of the sleeve assembly in a specific embodiment.

[0044] Figure 10 Structural schematic diagram of the connection between the hub system in a specific embodiment and other components in the rotary-wing aircraft.

[0045] Reference Signs:

[0046] 1-Constant velocity joint, 11-First connecting part, 12-Spline keyway, 2-Arm assembly, 21-Multi-directional joint, 211-Second connecting part, 212-Third connecting part, 213-Fourth connecting part, 22-Arm, 23-Connecting piece, 231-Fifth connecting part, 232-Sheathing part, 2321-Threaded groove, 24-Waving elastic part, 241-First mounting part, 242-Second mounting part, 243-First section, 244-Second section, 3-Hinge shaft, 31-First hinge shaft, 32-Second hinge shaft, 4-Oscillating elastic part, 41-Oscillating part, 42-Hinged part, 5-Centrifugal assembly, 51-Centrifugal fixing part, 52-Centrifugal anti-twisting part, 521-Cap-shaped part, 522-Insertion part, 53-Centrifugal elastic part, 531-Rotating part, 532-Fixed part, 6-Sleeve assembly, 61-Sleeve, 611-Centrifugal connecting part, 612-Blade connecting part, 62-Pitch change rocker arm, 7-Rotor shaft, 8-Control system connecting rod, 9-Blade. Detailed implementation mode

[0047] The following combines the drawings to specifically describe the preferred embodiments of the present invention. Among them, the drawings constitute a part of the present invention and are used together with the embodiments of the present invention to explain the principle of the present invention, and are not used to limit the scope of the present invention.

[0048] A specific embodiment of the present invention, as Figure 1 shown, discloses a rotor hub system for a gyrocopter, including a constant velocity joint 1, an arm assembly 2, an oscillating assembly, a centrifugal assembly 5 and a sleeve assembly 6.

[0049] As Figure 3 shown, the constant velocity joint 1 is arranged at the center of the rotor hub system, and the arm assembly 2 is arranged circumferentially on the outside and is hinged to the arm assembly 2. The arm assembly is hinged to the oscillating assembly, and a hinge shaft 3 is arranged at the hinge.

[0050] The main body of the constant velocity joint 1 is cylindrical, and a spline keyway 12 is arranged inside. The constant velocity joint 1 is sleeved on the rotor shaft 7 through a spline and can rotate synchronously with the rotor shaft 7 around its axis. A plurality of first connecting parts 11 are arranged at equal angles circumferentially on the outer edge of the constant velocity joint 1 for connecting the arm assembly 2.

[0051] The arm assembly 2 is connected to the first connecting part 11 and extends radially relative to the axis of the constant velocity joint 1. One end of the arm assembly 2 is hinged to the constant velocity joint 1, and the hinge shaft of the arm assembly 2 hinged to the constant velocity joint 1 is located in the radial plane of the constant velocity joint 1. The arm assembly 2 can rotate around its hinge shaft with the constant velocity joint 1 to realize the waving motion; the other end of the arm assembly 2 is connected to the centrifugal assembly 5.

[0052] As Figure 4As shown, the arm assembly 2 includes a multi-directional joint 21 , a swinging elastic member 24 , an arm 22 and a connecting member 23 .

[0053] like Figure 5 As shown, the multi-directional joint 21 has a second connection portion 211 for articulating the constant velocity joint 1. Exemplarily, the second connection portion 211 can be inserted into the first connection portion 11 of the constant velocity joint 1. Figure 2 As shown, the first connecting part 11 and the second connecting part 211 are both provided with through holes at corresponding positions, and a first hinge shaft 31 is provided in the through holes to form a hinge structure. The axis of the first hinge shaft 31 is perpendicular to the axis of the constant velocity joint 1. Further, the first hinge shaft 31 is an elastic body.

[0054] For example, the first hinge shaft 31 is formed by alternately stacking rubber layers and metal layers. Compared with the common hinge shaft in the prior art, the elastic hinge shaft does not need lubrication, and when used for hinge connection between components, it has less vibration and higher reliability than the common hinge shaft.

[0055] Compared with the prior art, this embodiment connects the constant velocity joint 1 and the support arm assembly 2 located at the center of the hub system through the first articulated shaft 31. No large star-shaped part is required to combine the constant velocity joint 1 and the support arm 22, which reduces the number of parts and reduces the difficulty of design and manufacturing.

[0056] In order to reduce friction and wear on the first hinge shaft 31 , an elastic layer is provided inside the through hole of the first connecting portion 11 and / or the second connecting portion 211 , or an elastic ball joint is provided in the through hole of the second connecting portion 211 .

[0057] The multi-directional joint 21 also has a third connection portion 212 and a fourth connection portion 213. The third connection portion 212 is arranged at an extension portion of the multi-directional joint 21 away from the second connection portion 211 and is used to connect the support arm 22; the fourth connection portion 213 is arranged on both sides of the multi-directional joint 21 and is used to connect the swing assembly.

[0058] Two swinging elastic members 24 are provided, and are arranged symmetrically with respect to a plane perpendicular to the axis direction of the constant velocity joint 1. One end of the swinging elastic member 24 is connected to the constant velocity joint 1, and the other end is connected to the multi-directional joint 21. The swinging elastic member 24 is used to limit the swinging motion of the arm assembly 2.

[0059] like Figure 6As shown, both ends of the flapping elastic member 24 have a first mounting portion 241 and a second mounting portion 242, which are respectively mounted on the constant velocity joint 1 and the multi-directional joint 21; the middle of the flapping elastic member 24 has a bent portion, and the bent portion has a plurality of first sections 243 and at least one second section 244. The first section 243 is arranged at an angle or perpendicular to the axis of the constant velocity joint 1, and the axis of the second section 244 is arranged non-parallel to the first section 243; the first section 243 and the second section 244 are arranged alternately. The bent structure of the flapping elastic member 24 can, on the one hand, improve the overall stiffness and stability of the flapping elastic member 24, on the other hand, facilitate deformation coordination, and at the same time disperse the stress during rotation, enhancing the stability and operation reliability of the component and the entire system.

[0060] It should be noted that in the flapping elastic member 24, at least one second section 244 is an elastomer. Exemplarily, the elastomer is formed by alternately laminating a metal layer and a rubber layer. The setting of the elastomer makes the flapping elastic member 24 have both the stiffness of metal and elastic properties. During the flapping motion, since the compression stiffness of the elastic bearing is stronger than the tensile stiffness, the elastic member will not be damaged due to stretching, improving the safety of the system.

[0061] The support arm 22 is a rectangular block and extends radially along the constant velocity joint 1. One end of the support arm 22 is connected to the third connecting portion 212, and the other end is connected to the connecting member 23.

[0062] The connecting member 23 has a fifth connecting portion 231 connected to the support arm 22 and a sleeving portion 232 connected to the centrifugal assembly 5. The sleeving portion 232 is rod-shaped. An external thread is provided at the end of the sleeving portion 232 near the fifth connecting portion 231, and a threaded groove 2321 is provided at the end of the sleeving portion 232 away from the fifth connecting portion 231 for connecting to the centrifugal assembly 5.

[0063] The flutter assembly is hinged to the fourth connecting portion 213 of the multi-directional joint 21 and is alternately arranged with the multi-directional joint 21 to form an annular chain structure around the axis of the constant velocity joint 1. The flutter assembly includes a flutter elastic member 4.

[0064] As Figure 7 shown, the flutter elastic member 4 includes a flutter portion 41 provided in the middle, and the flutter portion 41 is a cylindrical structure. Further, the flutter portion 41 is an elastomer, and the elastomer has an elastic stiffness along its own axis. Exemplarily, the flutter portion 41 is formed by alternately laminating a rubber layer and a metal layer.

[0065] Both ends of the flapping elastic member 4 are provided with symmetrically arranged hinge portions 42; the hinge portion 42 is provided with a through hole, which can cooperate with the fourth connecting portion 213 of the multi-directional joint 21 to form a hinge structure, and a second hinge shaft 32 is arranged at the hinge. The flapping elastic member 4 can swing left and right around the second hinge shaft 32 in a plane perpendicular to the axis of the constant velocity joint 1.

[0066] The axial direction of the second hinge shaft 32 is parallel to the axis of the constant velocity joint 1. Further, the second hinge shaft 32 is an elastic body.

[0067] An elastic ball hinge is arranged in the through hole of the hinge portion 42 and / or the second hinge shaft 32 is an elastic hinge shaft. Exemplarily, the second hinge shaft 32 is formed by alternately laminating rubber layers and metal layers. Compared with the ordinary hinge shaft in the prior art, the elastic hinge shaft does not require lubrication, and when used for the hinge between components, it has less vibration and higher reliability than the ordinary hinge shaft.

[0068] Compared with the prior art, in this embodiment, the second hinge shaft 32 is used to connect the support arm assembly 2 and the flapping assembly, without the need for more other parts, reducing the number of parts and the design and manufacturing difficulty.

[0069] In order to reduce the frictional wear of the second hinge shaft 32, an elastic layer is arranged inside the through hole in contact with the second hinge shaft 32.

[0070] Compared with the prior art, this embodiment is provided with a flapping elastic member 4. During the flapping motion, one end of the flapping elastic member 4 is in tension and the other end is in compression. However, due to the elastic effect of the elastic body, the elastic member will not be damaged due to stretching, improving the safety of the system. And the flapping elastic member 4 is an independent part, which is convenient for replacement and maintenance.

[0071] Further, the flapping assembly including at least one flapping elastic member 4 is alternately connected with the multi-directional joint 21 to form an annular chain structure centered on the constant velocity joint 1 to realize overall flapping. The elastic body can absorb the impact and vibration during the flapping process, cancel out the forces generated by the flapping, reduce the dynamic balance amount, and make the system operate more smoothly.

[0072] The centrifugal assembly 5 is sleeved on the sleeved portion 232 of the connecting member 23. As Figure 8 shown, the centrifugal assembly 5 includes a centrifugal elastic member 53, a centrifugal fixing member 51, and a centrifugal anti-twist member 52.

[0073] The centrifugal elastic member 53 is in the shape of a hollow cylinder and includes a rotating portion 531 and a fixing portion 532. Threaded holes are provided on the outer circumferential wall surface of the rotating portion 531 for connecting the sleeve 61. When the sleeve 61 rotates, it drives the rotating portion 531 to rotate. The inner wall surface of the fixing portion 532 is provided with internal threads and is screwed and installed with the sleeved portion 232.

[0074] It should be noted that the fixing portion 532 of the centrifugal elastic member 53 is provided with an elastomer. Exemplarily, the elastomer is formed by alternately laminating a metal layer and a rubber layer. The setting of the elastomer enables the centrifugal elastic member 53 to have both the stiffness of metal and elastic properties.

[0075] The centrifugal fixing member 51 is adjacent to the centrifugal elastic member 53. The centrifugal fixing member 51 is annular, and its end face is fixed to the end of the fixing portion 532 of the centrifugal elastic member 53. The centrifugal anti-twist member 52 includes a cover-like portion 521 and an insertion portion 522. The cover-like portion 521 is fixed to the end face of the centrifugal fixing member 51; the insertion portion 522 is rod-shaped, and the insertion portion 522 can be inserted into the threaded groove 2321 of the connecting member 23 and screwed with the sleeve portion 232 of the connecting member 23.

[0076] Specifically, the centrifugal elastic member 53 and the sleeve portion 232 are connected by right-handed / left-handed threads, and the centrifugal anti-twist member 52 and the sleeve portion 232 are connected by left-handed / right-handed threads to prevent the threads from becoming loose due to long-term high-frequency movement and improve the safety of the system.

[0077] One end of the cuff assembly 6 is connected to the centrifugal elastic member 53, and the other end is connected to the blade 9. As Figure 9 shown, the cuff assembly 6 includes a cuff 61 and a pitch-changing rocker arm 62.

[0078] The cuff 61 is an integral elliptical sleeve structure, including a centrifugal connection portion 611 and a blade connection portion 612. The centrifugal connection portion 611 is used to connect the centrifugal assembly 5 and is sleeved outside the fixing portion 532 of the centrifugal elastic member 53. The blade connection portion 612 is used to connect the blade 9 and is sleeved outside the blade 9.

[0079] The pitch-changing rocker arm 62 is arranged on one side of the opening of the centrifugal connection portion 611, and the pitch-changing rocker arm 62 connects the control system link 8. Exemplarily, the control system link 8 is inserted into the pitch-changing rocker arm 62, and the up-and-down movement of the control system link 8 causes the cuff 61 to rotate, driving the blade 9 to perform pitch-changing rotation.

[0080] When the cuff 61 rotates, the rotating portion 531 of the centrifugal elastic member 53 connected to the cuff 61 rotates simultaneously; while the end of the fixing portion 532 of the centrifugal elastic member 53 is relatively fixed to the support arm assembly 2, one end of the fixing portion 532 of the centrifugal elastic member 53 is twisted and the other end is fixed, bearing a large shear force. In this embodiment, the centrifugal elastic member 53 is provided with an elastomer portion, and the moment of inertia of the system is adjusted through the self-deformation of the elastomer to achieve dynamic balance and improve the stability of the system.

[0081] Initially, the centers of the constant velocity joint 1, the support arm assembly 2, the flapping elastic member 4, the centrifugal elastic assembly, and the cuff assembly 6 are in the same plane, which is convenient for installation and positioning.

[0082] As the constant velocity joint 1 rotates, the support arm assembly 2 makes a flapping motion around the first hinge axis 31; the flapping elastic member 4 makes a flapping motion around the second hinge axis 32; during pitch change, the sleeve 61 rotates under the moment of the control system link 8, driving the pitch change of the blade 9.

[0083] Compared with the prior art, in this embodiment, the constant velocity joint 1 is connected to the rotor shaft 7 and rotates synchronously with the rotor shaft 7; the support arm assembly 2 is hinged to the constant velocity joint 1 to achieve the flapping motion; the flapping assembly is hinged to the support arm assembly 2 to achieve the flapping motion; the centrifugal assembly 5 is connected to the support arm assembly 2 and the sleeve assembly 6, and the sleeve assembly 6 is connected to the blade 9 to achieve the pitch change motion. Compared with the existing hub system, in this embodiment, the flapping and flapping motions are respectively realized by the hinged method, and the pitch change is realized through the centrifugal assembly 5, without the need for a large star-shaped part to be combined, reducing the number of structural parts and the design and manufacturing difficulty. In this embodiment, by setting the flapping elastic member 24, the flapping elastic member 4, and the centrifugal elastic member 53, and utilizing the elastic function of the elastic member, the design and manufacturing difficulty is effectively reduced, the vibration level of the hub is reduced, and the stability of the hub system is improved.

[0084] An embodiment of the present invention also provides a gyrocopter, including the rotor hub system in the above-described embodiment.

[0085] As Figure 10 shown, a spline keyway 12 is provided in the center of the constant velocity joint 1, and it can be fixedly sleeved on the rotor shaft 7 through a spline sleeve, and the constant velocity joint 1 can rotate with the rotor shaft 7;

[0086] The sleeve 61 is sleeved outside the blade 9, and the blade 9 can rotate with the sleeve 61;

[0087] The control system link 8 is connected to the pitch change rocker arm 62, and the up and down movement of the control system link 8 can drive the sleeve 61 to rotate, causing the pitch change of the blade 9.

[0088] Compared with the prior art, the advantages of the gyrocopter in the embodiment of the present invention are the same as those of the above-described rotor hub system, and will not be elaborated here.

[0089] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention.

Claims

1. A rotorcraft hub system, characterized in that, It includes a constant velocity joint (1), a swashplate assembly (2), a flapping assembly, and a centrifugal assembly (5); The constant velocity joint (1) is arranged at the center of the hub system. The constant velocity joint (1) is sleeved and connected to the rotor shaft (7) and can rotate around its axis along with the rotor shaft (7); The swashplate assembly (2) is circumferentially arranged along the outer edge of the constant velocity joint (1); One end of the swashplate assembly (2) is hinged to the constant velocity joint (1), and the swashplate assembly (2) can perform flapping motion along the axis of the constant velocity joint (1); The flapping assembly is hinged to the side of the swashplate assembly (2), and the flapping assembly can perform left - right flapping motion in a plane perpendicular to the axis of the constant velocity joint (1); The centrifugal assembly (5) is connected to the other end of the swashplate assembly (2), and the centrifugal assembly (5) can rotate under the drive of the pitch change rocker arm (62) to achieve pitch change motion; A spline keyway (12) is arranged at the center of the constant velocity joint (1) for connecting the rotor shaft (7); A plurality of first connection parts (11) are circumferentially and equally - angledly arranged along the outer edge of the constant velocity joint (1); The first connection part (11) is used for hinging the swashplate assembly (2), and a first hinge shaft (31) is arranged at the hinge; The flapping assembly and the swashplate assembly (2) are alternately arranged to form an annular chain - like structure around the axis of the constant velocity joint (1); The flapping assembly includes at least one flapping elastic member (4). Both ends of the flapping elastic member (4) are respectively hinged to adjacent two swashplate assemblies (2), and a second hinge shaft (32) is arranged at the hinge; The first hinge shaft (31) and / or the second hinge shaft (32) is an elastic member.

2. The autogyro hub system according to claim 1, wherein, The flapping elastic member (4) includes a flapping part (41) arranged in the middle and hinge parts (42) symmetrically arranged at both ends; The flapping part (41) is an elastic body, and the elastic body has elastic stiffness along its own axis; The hinge part (42) can cooperate with the side of the swashplate assembly (2) to form a hinge structure.

3. The hub system of a gyrocopter according to claim 1, characterized in that, It further includes a sleeve (61); The sleeve (61) includes a centrifugal connection part (611). The centrifugal connection part (611) is sleeved and connected to the outside of the centrifugal assembly (5) and can drive the centrifugal assembly (5) to rotate to achieve pitch change; The pitch change rocker arm (62) is arranged on one side of the end of the centrifugal connection part (611).

4. The autogyro hub system according to claim 1, characterized in that It further includes a flapping elastic member (24); One end of the flapping elastic member (24) is connected to the constant velocity joint (1), and the other end is connected to the swashplate assembly (2); And / or the centrifugal assembly (5) includes a centrifugal elastic member (53); The centrifugal elastic member (53) is arranged at the end of the swashplate assembly (2).

5. The autogyro hub system according to claim 1, characterized in that, The central initial positions of the constant velocity joint (1), the swashplate assembly (2), the flapping assembly, and the centrifugal assembly (5) are in the same plane.

6. A gyrocopter, characterized in that, It includes the rotor hub system according to any one of claims 1 - 5.

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