Rocket engine gimbal seat structure

Abstract

The invention provides a gimbal seat structure of a rocket engine, and relates to the technical field of rocket engines, the gimbal seat structure comprises a swing seat, a pressure-bearing shaft structure, a pull-bearing arc shaft structure and a connecting plate; the swing seat comprises a first swing seat and a second swing seat; the bearing arc-shaped shaft structure is mounted on the bearing shaft structure; the pull-bearing arc-shaped shaft structure is fixedly connected with the first swing seat and the second swing seat through a connecting plate; the first swing base and the second swing base are located at the two ends of the pull-bearing arc-shaped shaft structure correspondingly. The first swing seat and the second swing seat are fixedly connected with the engine frame and the engine through fixing pieces respectively. The connecting structure has the advantages of being simple in structure, easy to machine, high in machining precision, easy to assemble and high in bearing capacity.

Description

Technical Field

[0001] The present application relates to the technical field of rocket engines, and in particular to a rocket engine gimbal structure. Background Art

[0002] The rocket engine and the engine mount are connected and supported by a gimbal. The gimbal structure needs to ensure that the rocket engine can push the rocket into the air and that the rocket engine can swing along the axis of the gimbal design to adjust the angle of the rocket's ascent.

[0003] At present, there are two main structural modes of the common gimbal structure. One is the cross-axis structure. Due to the structural principle and characteristics of the cross-axis structure, the axial pressure-bearing components of the engine and the machined bracket are the four farthest journals of the cross-axis. This leads to the poor axial pressure-bearing capacity of the cross-axis structure. If the axial pressure-bearing capacity needs to be increased, the cross-axis journal can only be increased, which will lead to excessive mass increase, and the structural size is too large and complicated. Therefore, the cross-axis structure is generally used for small rocket engines with small thrust. Another common structure is the ball-and-socket structure. The ball-and-socket structure is a concave hemispherical socket installed on the frame, and a ball head is installed on the rocket engine. The thrust of the rocket engine on the rocket and the swing of the engine are realized through the cooperation of the ball head and the ball socket. The ball-and-socket mechanism has a simple structure and a large axial pressure-bearing capacity. However, due to the complex processing of the ball-and-socket and the low processing accuracy, especially the low surface finish, it is easy to cause metal bite failure caused by the poor matching size of the ball head and the ball socket during use. In addition, the ball-and-socket structure has poor resistance to radial shear force and tension.

[0004] Therefore, the technical problem that urgently needs to be solved is: how to provide a rocket engine gimbal structure that has the characteristics of simple structure, small size, easy processing, high processing precision, easy assembly, and strong bearing capacity. Summary of the invention

[0005] The purpose of the present application is to provide a rocket engine gimbal structure, which has the characteristics of simple structure, easy processing, high processing precision, easy assembly, and strong load-bearing capacity.

[0006] In order to achieve the above-mentioned purpose, the present application provides a rocket engine gimbal structure, which includes: a swing seat, a pressure-bearing shaft structure, a tension-bearing arc shaft structure and a connecting plate; the swing seat includes: a first swing seat and a second swing seat; the tension-bearing arc shaft structure is installed on the pressure-bearing shaft structure; the tension-bearing arc shaft structure is fixedly connected to the first swing seat and the second swing seat through a connecting plate; the first swing seat and the second swing seat are respectively located at two ends of the tension-bearing arc shaft structure; the first swing seat and the second swing seat are respectively fixedly connected to the engine frame and the engine through fixings.

[0007] The rocket engine gimbal structure as described above, wherein the pressure-bearing shaft structure includes: a first semicircular shaft and a second semicircular shaft; the first semicircular shaft and the second semicircular shaft are cross-shaped and interlocked to form a pressure-bearing shaft structure.

[0008] The rocket engine gimbal structure as described above, wherein the first semicircular shaft is provided with a semicircular shaft arc groove inwardly along its arc surface; the second semicircular shaft is provided with a semicircular shaft arc groove inwardly along its arc surface; and the tension arc shaft structure is inserted into the semicircular shaft arc grooves of the first semicircular shaft and the second semicircular shaft.

[0009] The rocket engine gimbal structure as described above, wherein the tension-bearing arc shaft structure includes: a first arc shaft and a second arc shaft; the first arc shaft is inserted into the semicircular shaft arc groove of the first semicircular shaft; the second arc shaft is inserted into the semicircular shaft arc groove of the second semicircular shaft.

[0010] The rocket engine gimbal structure as described above, wherein the two ends of the first arc shaft have arc shaft heads; the two ends of the second arc shaft have arc shaft heads; the arc shaft heads at the two ends of the first arc shaft are fixedly connected to the second swing seat via a connecting plate; the arc shaft heads at the two ends of the second arc shaft are fixedly connected to the first swing seat via a connecting plate.

[0011] The rocket engine gimbal structure as described above, wherein the connecting plate has an axial hole; the arc-shaped shaft head is inserted into the axial hole.

[0012] The rocket engine gimbal structure as described above, wherein the first swing seat and the second swing seat each include a base plate and a mounting seat; the mounting seat is fixedly connected to the base plate; a keyway and an inwardly concave semicircular arc surface are provided on the mounting seat; the pressure-bearing shaft structure is connected to the semicircular arc surfaces of the first swing seat and the second swing seat; the tension-bearing arc shaft structure is inserted into the keyway of the first swing seat and the second swing seat.

[0013] The rocket engine gimbal structure as described above, wherein the keyway is opened through the middle of the mounting seat.

[0014] The rocket engine gimbal structure as described above, wherein the first arc-shaped shaft and the second arc-shaped shaft both have an arc-shaped shaft body, and the cross-section of the arc-shaped shaft body is arc-shaped.

[0015] The rocket engine gimbal structure as described above, wherein the first arc-shaped axis and the second arc-shaped axis are arranged in a cross shape.

[0016] The beneficial effects achieved by this application are as follows:

[0017] (1) This application uses a semicircular shaft as a pressure-bearing structure to reduce the overall structural size and mass. It can meet the dual-axis swing motion requirements of the engine while complying with the characteristics of the engine's small swing angle (generally about ±10). A larger shaft radius can be used as much as possible in a small space to increase the force-bearing area and reduce the pressure per unit area, thereby reducing the friction resistance of the friction surface of the structural parts and effectively reducing the risk of stress damage.

[0018] (2) The present application adopts a semicircular shaft and an arc shaft to form a cross shaft structure, which can realize a common cross shaft structure, meet the requirements of the double pendulum motion of the engine, and greatly reduce the size of the structure. In addition, the cross shaft structure can effectively distinguish the bearing points that bear pressure and tension, and meet the characteristics of the gimbal with large pressure load and small tension load. Secondly, the cross shaft structure can also effectively split the mating surfaces of all motion friction pairs into open arc surfaces, reducing the difficulty of processing. Ordinary grinders can be used to process each key motion mating surface, which is convenient for fine processing, ensuring the dimensional matching accuracy and surface finish of the motion friction pair, so as to form a better motion matching effect, ensure motion accuracy, and reduce motion friction. The matching of the motion friction pair includes the arc surface matching of the semicircular shaft and the swing seat, and the shaft hole matching of the connecting plate and the arc shaft. The keyway matching of the arc shaft and the swing seat.

[0019] (3) The present application adopts an arc-shaped shaft as a key, and the shaft heads at both ends of the arc-shaped shaft side are used as connecting parts between the semicircular shaft and the swing seat, thereby increasing the tangential bearing strength of the gimbal, reducing the number of parts, and simplifying the structural dimensions.

[0020] (4) The upper and lower parts of the gimbal of the present application are completely identical parts, which simplifies the structure and reduces the specifications and quantity of parts.

[0021] (5) The gimbal of the present application uses a connecting plate to connect the upper and lower parts, so that the upper and lower parts of the gimbal can be connected to the engine frame and the engine respectively, and then the connecting plate is installed during the docking installation to form an integral structure, making it easier to install and disassemble the engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For those skilled in the art, other drawings can also be obtained based on these drawings.

[0023] Figure 1 This is a front view of a rocket engine gimbal structure according to an embodiment of the present application.

[0024] Figure 2 A side view of a rocket engine gimbal structure according to an embodiment of the present application.

[0025] Figure 3 This is an exploded view of a rocket engine gimbal structure according to an embodiment of the present application.

[0026] Figure 4 It is a front view of the swing seat according to an embodiment of the present application.

[0027] Figure 5 It is a side view of the swing seat according to an embodiment of the present application.

[0028] Figure 6 This is a front view of the semicircular shaft according to an embodiment of the present application.

[0029] Figure 7 It is a side view of the semicircular shaft according to an embodiment of the present application.

[0030] Figure 8 This is a front view of the arc shaft according to an embodiment of the present application.

[0031] Fig. 9 This is a schematic diagram of the connection between two semicircular shafts in an embodiment of the present application.

[0032] Fig.10 This is a schematic diagram of the connection between the arc shaft and the semicircular shaft in an embodiment of the present application.

[0033] Fig.11 This is a schematic diagram of the connection between the arc shaft, semicircular shaft and swing seat in the embodiment of the present application.

[0034] Figure markings: 1-swing seat; 2-connecting plate; 3-tension-bearing arc shaft structure; 4-pressure-bearing shaft structure; 11-first swing seat; 12-second swing seat; 21-first connecting plate; 22-second connecting plate; 23-third connecting plate; 24-fourth connecting plate; 25-axis hole; 31-first arc shaft; 32-second arc shaft; 41-first semicircular shaft; 42-second semicircular shaft; 43-semicircular shaft arc groove; 44-semicircular shaft clamping groove; 111-bottom plate; 112-mounting seat; 113-keyway; 114-semicircular arc surface; 311-arc shaft body; 312-arc shaft head. DETAILED DESCRIPTION

[0035] The following is a clear and complete description of the technical solutions in the embodiments of the present application in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0036] like Figure 1-11As shown, the present application provides a rocket engine gimbal structure, which includes: a swing seat 1, a pressure-bearing shaft structure 4, a tensile arc-shaped shaft structure 3 and a connecting plate 2; the swing seat 1 includes: a first swing seat 11 and a second swing seat 12; the tensile arc-shaped shaft structure 3 is installed on the pressure-bearing shaft structure 4; the pressure-bearing shaft structure 4 bears pressure, and the tensile arc-shaped shaft structure 3 bears tension. The tensile arc-shaped shaft structure 3 is fixedly connected to the first swing seat 11 and the second swing seat 12 through the connecting plate 2; the first swing seat 11 and the second swing seat 12 are respectively located at the two ends of the tensile arc-shaped shaft structure 3; the first swing seat 11 and the second swing seat 12 are respectively fixedly connected to the engine frame and the engine through fixings. Thereby, a fixed connection between the rocket engine and the engine frame is achieved.

[0037] The present application discloses a rocket engine gimbal structure which only includes a swing seat, a pressure-bearing shaft structure 4, a tension-bearing arc-shaped shaft structure 3 and a connecting plate 2. The structure is simple, easy to process, has high processing accuracy, is easy to assemble, and has strong load-bearing capacity.

[0038] like Figure 3 , 6 As shown in Figures 7 and 8, the pressure-bearing shaft structure 4 includes: a first semicircular shaft 41 and a second semicircular shaft 42; the first semicircular shaft 41 and the second semicircular shaft 42 are cross-shaped and interlocked to form a pressure-bearing shaft structure 4. The first semicircular shaft 41 and the second semicircular shaft 42 have the same structure. The present application adopts semicircular shafts (the first semicircular shaft 41 and the second semicircular shaft 42) as pressure-bearing force structures to reduce the overall structural size and mass. While meeting the requirements of the dual-axis swing motion of the engine, it complies with the characteristics of the engine's small swing angle (generally about ±10). A larger shaft radius can be used as much as possible in a small space to increase the force-bearing area and reduce the pressure per unit area, thereby reducing the friction resistance of the moving friction surface of the structural member and effectively reducing the risk of stress damage.

[0039] like Figure 3 , 6 As shown in , 7 and 9, the bottom surface of the first semicircular shaft 41 is a plane, and the top surface is an arc surface; the bottom surface of the second semicircular shaft 42 is a plane, and the top surface is an arc surface; the plane of the first semicircular shaft 41 and the plane of the second semicircular shaft 42 are fitted and connected, and the first semicircular shaft 41 is arranged perpendicular to the second semicircular shaft 42, that is, they are arranged in a cross shape.

[0040] like Figure 3 , 6 As shown in FIGS. 7 and 9, the first semicircular shaft 41 is provided with a semicircular shaft arc groove 43 along its arc surface inwardly; the second semicircular shaft 42 is provided with a semicircular shaft arc groove 43 along its arc surface inwardly; the tensile arc shaft structure 3 is inserted into the semicircular shaft arc groove 43 of the first semicircular shaft 41 and the second semicircular shaft 42. The semicircular shaft arc groove 43 provided on the first semicircular shaft 41 and the semicircular shaft arc groove 43 provided on the second semicircular shaft 42 are arranged crosswise.

[0041] like Figure 3 , 6 As shown in FIGS. 7 and 9, two semicircular shaft clamping grooves 44 are provided inwardly on one side of the plane of the first semicircular shaft 41, and the two semicircular shaft clamping grooves 44 are located at both ends of the first semicircular shaft 41. Two semicircular shaft clamping grooves 44 are provided inwardly on one side of the plane of the second semicircular shaft 42, and the two semicircular shaft clamping grooves 44 are located at both ends of the second semicircular shaft 42, and the semicircular shaft clamping grooves 44 are used to clamp into the tensile arc shaft structure 3. The straight line direction where the two semicircular shaft clamping grooves 44 of the first semicircular shaft 41 are located is perpendicular to the straight line direction where the two semicircular grooves of the second semicircular shaft 42 are located.

[0042] like Figure 3 , 9 As shown in 10, the tensile arc shaft structure 3 includes: a first arc shaft 31 and a second arc shaft 32; the first arc shaft 31 is inserted into the semicircular shaft arc groove 43 of the first semicircular shaft 41, and the two ends of the first arc shaft 31 are inserted into the semicircular shaft slots 44 at the two ends of the second semicircular shaft 42; the second arc shaft 32 is inserted into the semicircular shaft arc groove 43 of the second semicircular shaft 42, and the two ends of the second arc shaft 32 are inserted into the semicircular shaft slots 44 at the two ends of the first semicircular shaft 41. The two arc shafts are buckled with the semicircular shaft arc grooves 43 of the two semicircular shafts to form a cross shaft structure. The present application adopts a semicircular shaft and an arc shaft to form a cross shaft structure, which can realize a common cross shaft structure, meet the requirements of the double pendulum motion of the engine, and greatly reduce the structural size. In addition, the cross shaft structure can effectively distinguish the bearing points that bear pressure and tensile force, meeting the characteristics of large pressure load and small tensile load of the gimbal. Secondly, the cross-axis structure can also effectively split the mating surfaces of all motion friction pairs into open arc surfaces, reducing the difficulty of processing. Ordinary grinders can be used to process each key motion mating surface, which is convenient for fine processing, ensuring the dimensional matching accuracy and surface finish of the motion friction pair, so as to form a better motion matching effect, ensure motion accuracy, and reduce motion friction. The matching of the motion friction pair includes the matching of the arc surface of the semicircular shaft and the swing seat 1, the matching of the shaft hole 25 of the connecting plate 2 and the arc shaft. The arc shaft matches the keyway 113 of the swing seat 1.

[0043] As a specific embodiment of the present invention, the semicircular shaft and the arc shaft are assembled by a keyway inlay structure, and specifically, the first semicircular shaft 41, the second semicircular shaft 42, the first arc shaft 31 and the second arc shaft 32 are assembled by a keyway inlay structure. The semicircular shaft (the first semicircular shaft 41 or the second semicircular shaft 42) plane has a partial keyway combined with the arc shaft, ensuring that after the two semicircular shafts (the first semicircular shaft 41 or the second semicircular shaft 42) and the arc shaft (the first arc shaft 31 or the second arc shaft 32) are assembled into a cross shaft, the semicircular shaft plane has a shear-resistant structure and will not cause relative sliding.

[0044] like Figure 3 , 8As shown, both ends of the first arc shaft 31 have an arc shaft head 312; both ends of the second arc shaft 32 have an arc shaft head 312; the arc shaft head 312 of the first arc shaft 31 protrudes from the first semicircular shaft 41 and the second semicircular shaft 42, and the arc shaft head 312 of the second arc shaft 32 protrudes from the first semicircular shaft 41 and the second semicircular shaft 42; the arc shaft heads 312 at both ends of the first arc shaft 31 are fixedly connected to the second swing seat 12 through the connecting plate 2; the arc shaft heads 312 at both ends of the second arc shaft 32 are fixedly connected to the first swing seat 11 through the connecting plate 2.

[0045] like Figure 3 As shown, the connecting plate 2 includes a first connecting plate 21, a second connecting plate 22, a third connecting plate 23 and a fourth connecting plate 24; the arc shaft heads 312 at both ends of the second arc shaft 32 are fixedly connected to the first swing seat 11 through the first connecting plate 21 and the second connecting plate 22, and the arc shaft heads 312 at both ends of the first arc shaft 31 are fixedly connected to the second swing seat 12 through the third connecting plate 23 and the fourth connecting plate 24.

[0046] The upper and lower ends of the connecting plate 2 respectively have a plane end and an arc end. The plane end fits the plane of the swing shaft and is fixedly connected to the swing shaft. The arc end is provided with an axis hole 25 for inserting the arc shaft head 312.

[0047] like Figure 3 As shown, the connecting plate 2 has an axial hole 25 ; the arc-shaped shaft head 312 is inserted into the axial hole 25 .

[0048] like Figure 4 and 5 As shown, the first swing seat 11 and the second swing seat 12 both include a bottom plate 111 and a mounting seat 112; the mounting seat 112 is fixedly connected to the bottom plate 111; a key slot 113 and an inwardly concave semicircular arc surface 114 are provided on the mounting seat 112; the pressure bearing shaft structure 4 is connected to the semicircular arc surface 114 of the first swing seat 11 and the second swing seat 12; the tension bearing arc shaft structure 3 is inserted into the key slot 113 of the first swing seat 11 and the second swing seat 12. The key slot 113 is provided through the middle of the mounting seat 112.

[0049] As a specific embodiment of the present invention, the first semicircular shaft 41 and the second semicircular shaft 42 are respectively connected in cooperation with the semicircular arc surface 114 of the first swing seat 11 and the second swing seat 12 to form a swing contact surface.

[0050] like Figure 8 As shown, the first arc-shaped shaft 31 and the second arc-shaped shaft 32 both have an arc-shaped shaft body 311 , and the cross section of the arc-shaped shaft body 311 is arc-shaped.

[0051] As a specific embodiment of the present invention, the semicircular shaft (the first semicircular shaft 41 and the second semicircular shaft 42) and the swing seat (the first swing seat 11 and the second swing seat 12) are matched with semicircular arc surfaces.

[0052] As a specific embodiment of the present invention, the semicircular shaft (first semicircular shaft 41, second semicircular shaft 42) and the swing seat (first swing seat 11, second swing seat 12) are connected into a whole by cooperating with the connecting plate 2 and the arc shaft (first arc shaft 31, second arc shaft 32), so that the upper and lower swing seats are connected into one.

[0053] As a specific embodiment of the present invention, the first arc-shaped axis 31 and the second arc-shaped axis 32 are arranged in a cross shape.

[0054] As a specific embodiment of the present invention, the bottom surface of the swing seat 1 has a mounting hole, and bolts are installed in the mounting hole of the swing seat 1, and the swing seat 1 is fixedly connected to the engine frame or the engine through the bolts.

[0055] As a specific embodiment of the present invention, the upper and lower parts of the gimbal structure of the present application are completely identical structural parts, which are completed by cross-shaped assembly.

[0056] The beneficial effects achieved by this application are as follows:

[0057] (1) This application uses a semicircular shaft as a pressure-bearing structure to reduce the overall structural size and mass. It can meet the dual-axis swing motion requirements of the engine while complying with the characteristics of the engine's small swing angle (generally about ±10). A larger shaft radius can be used as much as possible in a small space to increase the force-bearing area and reduce the pressure per unit area, thereby reducing the friction resistance of the friction surface of the structural parts and effectively reducing the risk of stress damage.

[0058] (2) The present application adopts a semicircular shaft and an arc shaft to form a cross shaft structure, which can realize a common cross shaft structure, meet the requirements of the double pendulum motion of the engine, and greatly reduce the size of the structure. In addition, the cross shaft structure can effectively distinguish the bearing points that bear pressure and tension, and meet the characteristics of the gimbal with large pressure load and small tension load. Secondly, the cross shaft structure can also effectively split the mating surfaces of all motion friction pairs into open arc surfaces, reducing the difficulty of processing. Ordinary grinders can be used to process each key motion mating surface, which is convenient for fine processing, ensuring the dimensional matching accuracy and surface finish of the motion friction pair, so as to form a better motion matching effect, ensure motion accuracy, and reduce motion friction. The matching of the motion friction pair includes the arc surface matching of the semicircular shaft and the swing seat, and the shaft hole matching of the connecting plate and the arc shaft. The keyway matching of the arc shaft and the swing seat.

[0059] (3) The present application adopts an arc-shaped shaft as a key, and the shaft heads at both ends of the arc-shaped shaft side are used as connecting parts between the semicircular shaft and the swing seat, thereby increasing the tangential bearing strength of the gimbal, reducing the number of parts, and simplifying the structural dimensions.

[0060] (4) The upper and lower parts of the gimbal of the present application are completely identical parts, which simplifies the structure and reduces the specifications and quantity of parts.

[0061] (5) The gimbal of the present application uses a connecting plate to connect the upper and lower parts, so that the upper and lower parts of the gimbal can be connected to the engine frame and the engine respectively, and then the connecting plate is installed during the docking installation to form an integral structure, making it easier to install and disassemble the engine.

[0062] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "plurality" means two or more, unless otherwise clearly and specifically defined.

[0063] In the description of the present application, the word "for example" is used to mean "used as an example, illustration or explanation". Any embodiment described as "for example" in the present application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is given to enable any technician in the field to implement and use the present invention. In the following description, details are listed for the purpose of explanation. It should be understood that a person of ordinary skill in the art can recognize that the present invention can be implemented without using these specific details. In other examples, well-known structures and processes will not be elaborated in detail to avoid obscuring the description of the present invention with unnecessary details. Therefore, the present invention is not intended to be limited to the embodiments shown, but is consistent with the widest scope consistent with the principles and features disclosed in the present application.

[0064] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A rocket engine gimbal structure, characterized in that: The structure comprises: a swing seat, a pressure bearing shaft structure, a tension bearing arc shaft structure and a connecting plate; The swing seat comprises: a first swing seat and a second swing seat; The tension-bearing arc-shaped shaft structure is installed on the pressure-bearing shaft structure; The tensile arc-shaped shaft structure is fixedly connected to the first swing seat and the second swing seat via a connecting plate; The first swing seat and the second swing seat are respectively located at two ends of the tension arc shaft structure; The first swing seat and the second swing seat are fixedly connected to the engine frame and the engine respectively through fixing parts.

2. The rocket engine gimbal structure according to claim 1, characterized in that: The pressure-bearing shaft structure comprises: a first semicircular shaft and a second semicircular shaft; The first semicircular shaft and the second semicircular shaft are cross-locked and connected to form a pressure-bearing shaft structure.

3. The rocket engine gimbal structure according to claim 2, characterized in that: The first semicircular shaft is provided with a semicircular shaft arc groove inwardly along its arc surface; the second semicircular shaft is provided with a semicircular shaft arc groove inwardly along its arc surface; The tensile arc-shaped shaft structure is inserted into the arc-shaped grooves of the first semicircular shaft and the second semicircular shaft.

4. The rocket engine gimbal structure according to claim 3, characterized in that: The tensile arc-shaped shaft structure comprises: a first arc-shaped shaft and a second arc-shaped shaft; The first arc-shaped shaft is inserted into the semicircular shaft arc-shaped groove of the first semicircular shaft; The second arc-shaped shaft is clamped into the semicircular shaft arc-shaped groove of the second semicircular shaft.

5. The rocket engine gimbal structure according to claim 4, characterized in that: Both ends of the first arc-shaped shaft have arc-shaped shaft heads; both ends of the second arc-shaped shaft have arc-shaped shaft heads; The arc-shaped shaft heads at both ends of the first arc-shaped shaft are fixedly connected to the second swing seat through connecting plates; The arc-shaped shaft heads at both ends of the second arc-shaped shaft are fixedly connected to the first swing seat through connecting plates.

6. The rocket engine gimbal structure according to claim 5, characterized in that: The connecting plate has an axial hole; The arc-shaped shaft head is inserted into the shaft hole.

7. The rocket engine gimbal structure according to claim 1, characterized in that: The first swing seat and the second swing seat each include a base plate and a mounting seat; The mounting seat is fixedly connected to the bottom plate; The mounting seat is provided with a keyway and an inwardly concave semicircular arc surface; The pressure-bearing shaft structure is connected within the semicircular arc surfaces of the first swing seat and the second swing seat; The tensile arc-shaped shaft structure is inserted into the key slots of the first swing seat and the second swing seat.

8. The rocket engine gimbal structure according to claim 7, characterized in that: The keyway is opened through the middle of the mounting seat.

9. The rocket engine gimbal structure according to claim 4, characterized in that: The first arc-shaped shaft and the second arc-shaped shaft both have an arc-shaped shaft body, The cross section of the arc-shaped shaft body is an arc.

10. The rocket engine gimbal structure according to claim 4, characterized in that: The first arc-shaped axis and the second arc-shaped axis are arranged in a cross shape.

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