Rotorcraft propeller hub system and rotorcraft

Abstract

The invention relates to a rotorcraft propeller hub system and a rotorcraft, belongs to the technical field of flight equipment, and solves the problems of many parts and poor reliability of a rotorcraft propeller hub in the prior art. The device comprises a constant velocity joint, a support arm assembly, a shimmy assembly and a centrifugal assembly, the constant velocity joint is arranged in the center of the propeller hub system, is connected to the rotor shaft in a sleeving manner and can rotate around the axis of the rotor shaft 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 swing along the axis of the constant velocity joint. The shimmy assembly is hinged to the side portion of the supporting arm assembly and can achieve left-right shimmy motion in the plane perpendicular to the axis of the constant-speed connector. The centrifugal assembly is connected with the other end of the supporting arm assembly, and the centrifugal assembly can be driven by the variable-pitch rocker arm to rotate so as to achieve variable-pitch movement. The number of parts of the propeller hub system is reduced, and the reliability and stability of the system are improved.

Description

Technical Field

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

[0002] For a rotorcraft, the hub system is the connection structure between the transmission shaft, blades and control system. It can transmit the power of the transmission shaft, transmit the control system instructions to control the flapping, pitch change and shimmy movement of the blades, and bear the reaction force of the blades' movement in three directions. Therefore, the hub system is the core structure for realizing various maneuvers such as flight, speed change, turning, pitching, etc. of the rotorcraft.

[0003] The first generation of hub systems is realized with metal structures and hinges in three directions. It has many structures, heavy weight, and poor bearing reliability. The second generation is a flexible bearing hub, which uses elastic materials to replace metal bearings. The variable pitch flapping and swinging movements are all realized by flexible material structures. The design of flexible material structures is difficult, the reliability is not high, and the material process requirements are high. The third generation is a bearingless hub, which uses elastic parts to offset the movement in three directions. The Black Hawk is a representative example. The disadvantage is that there are still many parts and it is slightly bulky. The fourth generation is a central elastic universal hinge hub, which uses a central universal hinge to realize flapping and swinging movements, and combines the centrifugal bearing and the variable pitch bearing through a larger star-shaped part to realize the transmission of variable pitch and centrifugal force. The typical representative is V280, but the design and verification of the central elastic part and the star-shaped part are difficult, and it is difficult for small enterprises and even most countries to complete the entire process. Summary of the invention

[0004] In view of the above analysis, an embodiment of the present invention aims to provide a rotorcraft hub system and a rotorcraft, so as to solve the problems in the prior art that the rotorcraft hub has many parts, is difficult to design, has a complex manufacturing process, and has poor reliability.

[0005] The purpose of the present invention is mainly achieved through the following technical solutions:

[0006] One aspect of the present invention provides a rotorcraft hub system, comprising a constant velocity joint, an arm assembly, a swing assembly, a centrifugal assembly and a sleeve assembly;

[0007] The constant velocity joint is arranged at the center of the hub system, and 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 arm assembly is arranged along the circumference of the outer edge of the constant velocity joint; one end of the arm assembly is hinged to the constant velocity joint, and the arm assembly can realize swinging motion along the axis of the constant velocity joint;

[0009] The swing assembly is hinged to the side of the arm assembly, and the swing assembly can realize left-right swing motion 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 driven by the variable pitch rocker arm to achieve variable pitch motion.

[0011] Furthermore, a spline keyway is provided at the center of the constant velocity joint for connecting the rotor shaft; a plurality of first connection parts are provided at equal angles along the circumferential direction on the outer edge of the constant velocity joint; the first connection part is used to hinge the support arm assembly, and a first hinge shaft is provided at the hinge.

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

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

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

[0015] Furthermore, the oscillating elastic member includes an oscillating portion arranged in the middle and hinge portions symmetrically arranged at both ends;

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

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

[0018] Further, it also includes a sleeve;

[0019] The sleeve includes a centrifugal connection portion, which 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 variable pitch rocker arm is arranged at one side of the end of the centrifugal connection part.

[0021] Furthermore, it also includes a swinging elastic member; one end of the swinging 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 arm assembly.

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

[0024] The present invention also provides a rotorcraft, comprising the rotorcraft hub system.

[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, the present invention sets a constant velocity joint connected to the rotor shaft to realize synchronous rotation with the rotor shaft; the arm assembly is hinged to the constant velocity joint to realize flapping motion; the swing assembly is hinged to the arm assembly to realize swinging motion; the centrifugal assembly is connected to the arm assembly, and the centrifugal assembly rotates under the drive of the control system connecting rod connected to the pitch rocker arm to realize pitch change motion. Compared with the existing hub system, the present invention respectively realizes flapping and swinging by hinged connection, realizes pitch change by centrifugal assembly, does not need large star-shaped parts to combine, reduces the number of structural parts, and reduces the difficulty of design and manufacturing.

[0027] (2) The arm assembly is arranged at equal angles outside the constant velocity joint and is hinged by an elastic hinge shaft; both ends of the swing elastic member are hinged to the arm assembly by an elastic hinge shaft. Compared with the ordinary hinge shaft in the prior art, the elastic hinge shaft does not require lubrication. When used for hinge connection between components, it has less vibration and higher reliability than the ordinary hinge shaft.

[0028] (3) During the oscillation movement, one end of the oscillation elastic member is stretched and the other end is compressed. However, due to the elastic effect of the elastic body, the elastic member will not be damaged by stretching, which improves the safety of the system. In addition, the oscillation elastic member is an independent part, which is easy to replace and maintain.

[0029] (4) Compared with the prior art, the present invention comprises an alternating connection between the swing assembly and the support arm assembly to form an annular chain structure with the constant velocity joint as the center to realize the overall swing. The elastic member can absorb the impact and vibration during the swing process, so that the forces generated by the swing offset each other, reduce the dynamic balance, and make the system run more smoothly.

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

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

[0032] (7) In the initial state, the center initial positions of the constant velocity joint, the support arm assembly, the swing 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-mentioned technical solutions can also be combined with each other to achieve more preferred combination solutions. Other features and advantages of the present invention will be described in the following content, and some advantages can be obvious from the description or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained through the contents particularly pointed out in the text and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The drawings are only for the purpose of illustrating particular embodiments and are not to be considered limiting of the present invention. Like reference symbols denote like components throughout the drawings.

[0035] Figure 1 is a structural schematic diagram of a hub system in a specific embodiment;

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

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

[0038] Figure 4 is a structural schematic diagram of an arm assembly in a specific embodiment;

[0039] Figure 5 It is a structural schematic diagram of a multi-directional joint in a specific embodiment;

[0040] Figure 6 is a schematic structural diagram of a swinging elastic member in a specific embodiment;

[0041] Figure 7 is a schematic structural diagram of a shimmying elastic member in a specific embodiment;

[0042] Figure 8 It is a structural schematic diagram of a centrifugal assembly in a specific embodiment;

[0043] Fig. 9 It is a schematic diagram of the structure of the sleeve assembly in a specific embodiment.

[0044] Fig.10 It is a schematic structural diagram of the connection between the hub system and other components in a rotorcraft in a specific embodiment.

[0045] Reference numerals:

[0046] 1-constant velocity joint, 11-first connection part, 12-spline keyway, 2-support arm assembly, 21-multi-directional joint, 211-second connection part, 212-third connection part, 213-fourth connection part, 22-support arm, 23-connecting piece, 231-fifth connection part, 232-sleeve part, 2321-thread groove, 24-swinging elastic member, 241-first mounting part, 242-second mounting part, 243-first section, 244-second section, 3-articulated shaft, 31 -First hinge shaft, 32-second hinge shaft, 4-oscillation elastic member, 41-oscillation part, 42-hinge part, 5-centrifugal assembly, 51-centrifugal fixing member, 52-centrifugal anti-twist member, 521-cover-shaped part, 522-insertion part, 53-centrifugal elastic member, 531-rotating part, 532-fixing part, 6-sleeve assembly, 61-sleeve, 611-centrifugal connecting part, 612-blade connecting part, 62-pitch rocker arm, 7-rotor shaft, 8-control system connecting rod, 9-blade. DETAILED DESCRIPTION

[0047] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0048] A specific embodiment of the present invention, as Figure 1 As shown, a rotorcraft hub system is disclosed, including a constant velocity joint 1, an arm assembly 2, a swing assembly, a centrifugal assembly 5 and a sleeve assembly 6.

[0049] like Figure 3 As shown, the constant velocity joint 1 is arranged at the center of the hub system, and an arm assembly 2 is arranged circumferentially on the outside and is hinged to the arm assembly 2. The arm assembly is hinged to the swing assembly, and an articulation 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 provided 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. The outer edge of the constant velocity joint 1 is provided with a plurality of first connecting parts 11 at equal angles along the circumferential direction, which are used to connect the arm assembly 2.

[0051] The arm assembly 2 is connected to the first connection portion 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 axis of the arm assembly 2 and the constant velocity joint 1 is located in the radial plane of the constant velocity joint 1. The arm assembly 2 can rotate around the hinge axis with the constant velocity joint 1 to achieve a swinging motion; the other end of the arm assembly 2 is connected to the centrifugal assembly 5.

[0052] like 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, the two ends of the swinging 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 swinging elastic member 24 has a bending portion, and the bending 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 bending structure of the swinging elastic member 24 can improve the overall stiffness and stability of the swinging elastic member 24 on the one hand, and is conducive to deformation coordination on the other hand, while dispersing the stress during rotation, thereby enhancing the stability and operational reliability of the component and the entire system.

[0060] It should be noted that in the swinging elastic member 24, at least one second section 244 is an elastic body. Exemplarily, the elastic body is formed by alternately stacking metal layers and rubber layers. The setting of the elastic body enables the swinging elastic member 24 to have both the rigidity of metal and the elasticity. During the swinging motion, since the compression rigidity of the elastic bearing is stronger than the tensile rigidity, the elastic member will not be damaged due to stretching, thereby improving the safety of the system.

[0061] The support arm 22 is a rectangular block, and is extended along the radial direction of 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 sleeve portion 232 connected to the centrifugal assembly 5. The sleeve portion 232 is in the shape of a round rod. The outer end of the sleeve portion 232 near the fifth connecting portion 231 is provided with an external thread, and the end of the sleeve portion 232 away from the fifth connecting portion 231 is provided with a thread groove 2321 for connecting with the centrifugal assembly 5.

[0063] The oscillating 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 oscillating assembly includes an oscillating elastic member 4.

[0064] like Figure 7 As shown, the oscillating elastic member 4 includes an oscillating portion 41 disposed in the middle, and the oscillating portion 41 is a cylindrical structure. Further, the oscillating portion 41 is an elastic body, and the elastic body has elastic stiffness along its own axis. Exemplarily, the oscillating portion 41 is formed by alternately stacking rubber layers and metal layers.

[0065] The two ends of the oscillating elastic member 4 have symmetrically arranged hinged parts 42; the hinged parts 42 are provided with through holes, which can cooperate with the fourth connecting part 213 of the multi-directional joint 21 to form an articulated structure, and the hinge is provided with a second articulated shaft 32. The oscillating elastic member 4 can oscillate left and right around the second articulated shaft 32 in a plane perpendicular to the axis of the constant velocity joint 1.

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

[0067] An elastic ball joint and / or an elastic hinge shaft 32 is provided in the through hole of the hinge portion 42. For example, the second hinge shaft 32 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 require lubrication, and when used for hinge connection between components, it has less vibration and higher reliability than the common hinge shaft.

[0068] Compared with the prior art, this embodiment connects the arm assembly 2 and the swing assembly via the second hinge shaft 32, does not require any other parts, reduces the number of parts, and reduces the difficulty of design and manufacturing.

[0069] In order to reduce friction and wear on the second hinge shaft 32 , an elastic layer is provided inside the through hole in contact with the second hinge shaft 32 .

[0070] Compared with the prior art, this embodiment is provided with a shimmying elastic member 4. During the shimmying motion, one end of the shimmying elastic member 4 is stretched and the other end is compressed, but due to the elastic effect of the elastic body, the elastic member will not be damaged by stretching, thereby improving the safety of the system. Moreover, the shimmying elastic member 4 is an independent member, which is easy to replace and maintain.

[0071] Furthermore, a swing assembly including at least one swing 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 achieve overall swing. The elastomer can absorb the impact and vibration during the swing process, so that the forces generated by the swing offset each other, reduce the dynamic balance, and make the system run more smoothly.

[0072] The centrifugal assembly 5 is sleeved on the sleeve portion 232 of the connecting member 23. Figure 8 As 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 hollow cylindrical and includes a rotating portion 531 and a fixed portion 532. The outer wall surface of the rotating portion 531 is provided with a threaded hole for connecting the sleeve 61. When the sleeve 61 rotates, the rotating portion 531 is driven to rotate. The inner wall surface of the fixed portion 532 is provided with an internal thread, which is screwed and installed with the sleeve portion 232.

[0074] It should be noted that the fixing portion 532 of the centrifugal elastic member 53 is provided with an elastic body. Exemplarily, the elastic body is formed by alternately stacking metal layers and rubber layers. The provision of the elastic body enables the centrifugal elastic member 53 to have both the rigidity of metal and the elasticity.

[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 portion 521 and an insertion portion 522. The cover portion 521 is fixed to the end face of the centrifugal fixing member 51; the insertion portion 522 is a round rod, 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 is connected to the sleeve portion 232 via a right-handed / left-handed thread, and the centrifugal anti-twist member 52 is connected to the sleeve portion 232 via a left-handed / right-handed thread, so as to avoid long-term high-frequency movement causing the thread to become loose, thereby improving the safety of the system.

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

[0078] The sleeve 61 is an integrated 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 on the outside of 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 on the outside of the blade 9.

[0079] The variable pitch rocker arm 62 is arranged at one side of the mouth of the centrifugal connection part 611, and the control system connecting rod 8 is connected in the variable pitch rocker arm 62. For example, the control system connecting rod 8 is inserted in the variable pitch rocker arm 62, and the up and down movement of the control system connecting rod 8 causes the sleeve 61 to rotate, driving the blade 9 to rotate with variable pitch.

[0080] When the sleeve 61 rotates, the rotating portion 531 of the centrifugal elastic member 53 connected to the sleeve 61 rotates at the same time; and the end of the fixed portion 532 of the centrifugal elastic member 53 is relatively fixed to the arm assembly 2, and one end of the fixed portion 532 of the centrifugal elastic member 53 is twisted and the other end is fixed, so as to bear a large shear force. In this embodiment, the centrifugal elastic member 53 is provided with an elastic body part, and the inertia moment of the system is adjusted by the deformation of the elastic body itself, so as 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 oscillating elastic member 4, the centrifugal elastic assembly, and the sleeve assembly 6 are in the same plane, which is convenient for installation and positioning.

[0082] As the constant velocity joint 1 rotates, the arm assembly 2 swings around the first hinge axis 31; the swing elastic member 4 swings around the second hinge axis 32; when changing pitch, the sleeve 61 rotates under the torque of the control system connecting rod 8, driving the blade 9 to change pitch.

[0083] Compared with the prior art, the present embodiment sets a constant velocity joint 1 connected with the rotor shaft 7 to rotate synchronously with the rotor shaft 7; the arm assembly 2 is hinged with the constant velocity joint 1 to realize the swinging motion; the swinging assembly is hinged with the arm assembly 2 to realize the swinging motion; the centrifugal assembly 5 is connected with the arm assembly 2 and the sleeve assembly 6, and the sleeve assembly 6 is connected with the blade 9 to realize the variable pitch motion. Compared with the existing hub system, the present embodiment respectively adopts an articulated manner to realize the swinging and swinging, and realizes the variable pitch through the centrifugal assembly 5, and does not need a large star-shaped part to combine, thereby reducing the number of structural parts and reducing the difficulty of design and manufacturing. The present embodiment sets a swinging elastic part 24, a swinging elastic part 4, and a centrifugal elastic part 53, and utilizes the elastic function of the elastic parts, thereby effectively reducing the difficulty of design and manufacturing, reducing the vibration level of the hub, and improving the stability of the hub system.

[0084] An embodiment of the present invention further provides a rotorcraft, comprising the rotorcraft hub system in the above-mentioned embodiment.

[0085] like Fig.10 As shown, a spline keyway 12 is provided at the center of the constant velocity joint 1, which can be fixed to 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 on the outside of the blade 9, and the blade 9 can rotate along with the sleeve 61;

[0087] The control system connecting rod 8 is connected to the pitch-changing rocker arm 62 , and the up-and-down movement of the control system connecting rod 8 can drive the sleeve 61 to rotate, so that the pitch of the blade 9 changes.

[0088] Compared with the prior art, the advantages of the rotorcraft according to the embodiment of the present invention are the same as the advantages of the rotorcraft hub system described above, which will not be described in detail here.

[0089] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A rotorcraft hub system, characterized in that: It comprises a constant velocity joint (1), an arm assembly (2), a swing assembly and a centrifugal assembly (5); The constant velocity joint (1) is arranged at the center of the propeller hub system, and 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 arm assembly (2) is arranged along the circumference of the outer edge of the constant velocity joint (1); one end of the arm assembly (2) is hinged to the constant velocity joint (1), and the arm assembly (2) can achieve a swinging motion along the axis of the constant velocity joint (1); The swing assembly is hinged to the side of the support arm assembly (2), and the swing assembly can realize left-right swinging movement 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 support arm assembly (2), and the centrifugal assembly (5) can be driven by the pitch-changing rocker arm (62) to rotate to achieve pitch-changing motion.

2. The rotorcraft hub system according to claim 1, characterized in that: The constant velocity joint (1) is provided with a spline keyway (12) at its center for connecting to a rotor shaft (7); a plurality of first connection portions (11) are provided at equal angles along the circumferential direction on the outer edge of the constant velocity joint (1); the first connection portion (11) is used for hinged connection to the support arm assembly (2), and a first hinge shaft (31) is provided at the hinged position.

3. The rotorcraft hub system according to claim 1, characterized in that: The swing assembly and the support arm assembly (2) are arranged alternately to form an annular chain structure around the axis of the constant velocity joint (1).

4. The rotorcraft hub system according to claim 3, characterized in that: The swing assembly comprises at least one swing elastic member (4), and the two ends of the swing elastic member (4) are respectively hinged to two adjacent support arm members (2), and a second hinge shaft (32) is provided at the hinge.

5. The rotorcraft hub system according to claim 4, characterized in that: The first hinge shaft (31) and / or the second hinge shaft (32) is an elastic member.

6. The rotorcraft hub system according to claim 4, characterized in that: The oscillating elastic member (4) comprises an oscillating portion (41) arranged in the middle and hinge portions (42) symmetrically arranged at both ends; The swinging part (41) is an elastic body, and the elastic body has elastic rigidity along its own axis; The hinged portion (42) can cooperate with the side portion of the arm assembly (2) to form a hinged structure.

7. The rotorcraft hub system according to claim 1, characterized in that: Also includes a sleeve (61); The sleeve (61) comprises a centrifugal connection portion (611), wherein the centrifugal connection portion (611) is sleeved and connected to the outside of the centrifugal component (5), and can drive the centrifugal component (5) to rotate and achieve pitch change; The variable pitch rocker arm (62) is arranged on one side of the end of the centrifugal connection portion (611).

8. The rotorcraft hub system according to claim 1, characterized in that: It also includes a swinging elastic member (24); one end of the swinging elastic member (24) is connected to the constant velocity joint (1), and the other end is connected to the support arm assembly (2); And / or the centrifugal assembly (5) comprises a centrifugal elastic member (53); the centrifugal elastic member (53) is arranged at the end of the support arm assembly (2).

9. The rotorcraft hub system according to claim 3, characterized in that: The central initial positions of the constant velocity joint (1), the support arm assembly (2), the oscillating assembly and the centrifugal assembly (5) are located in the same plane.

10. A rotorcraft, characterized in that: It comprises the rotorcraft hub system as described in any one of claims 1-9.

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