A spherical double pendulous gimbal for large-thrust rocket engines

Abstract

The application discloses a spherical double-swing gimbal for a large-thrust rocket engine and belongs to the technical field of rocket engines, which comprises an upper support, a lower support, a connecting shaft, a force transmission block and a self-locking nut. The lower part of the upper support is provided with a semispherical force transmission groove, and the upper part of the lower support is provided with a semispherical force transmission body. The lower support is rotatably connected with the force transmission groove of the upper support through a spherical force transmission surface, and can bear the thrust of the rocket engine. The force transmission block is rotatably connected with the lower support in the vertical plane. The force transmission block is penetrated by the connecting shaft in the length direction. The upper support is rotatably connected with the force transmission block in the vertical plane through the connecting shaft. The rotating surface of the upper support is perpendicular to the rotating surface of the force transmission block. The connecting shaft is fixedly connected with the force transmission block in the axial direction through the self-locking nut. The application can bear the thrust of the engine through the spherical force transmission surface, and the rigidity of the spherical force transmission structure is large and the deformation is small, so that the bearing capacity and reliability of the gimbal can be effectively improved.

Description

Technical Field

[0001] This invention relates to the field of rocket engine technology, and in particular to a spherical double pendulum constant level seat for a high-thrust rocket engine. Background Technology

[0002] The rocket engine is the core power component of a launch vehicle. During flight, the rocket requires precise attitude control. A servo mechanism provides control torque to the engine, causing the thrust mount to rotate around the engine's oscillation axis. This enables the rocket to control its thrust axis. Therefore, the reliability of the thrust mount directly affects the reliability of the engine.

[0003] With the development of my country's launch vehicle technology and the increasing demand for satellite constellation in recent years, higher requirements have been placed on the thrust of rocket engines. Most of the existing engine models in my country use a cross-shaft type thrust mount, which consists of an upper base, a lower base, a cross shaft, and a bearing seat. The cross shaft and the bearing seat are fitted with bearings.

[0004] The cross-shaped bearing seat is simple in structure and easy to install, but the cross shaft is highly sensitive to deformation. For high-thrust engines, the cross shaft has poor rigidity and will deflect due to bending moments. When the deflection at the shaft end exceeds the bearing clearance, there is a risk of seizure. Increasing the bearing clearance can solve the seizure problem, but it will affect the lubrication of the bearing and easily lead to galling. In addition, for high-thrust engines, the structural mass and size of the bearing seat will greatly affect the rocket's payload capacity. Therefore, it is necessary to provide a new technical solution to address the above problems. Summary of the Invention

[0005] To address the aforementioned technical problems, this application provides a spherical double pendulum constant-level seat for high-thrust rocket engines, which can bear the thrust of the engine through the spherical force transmission surface, so that the constant-level seat can meet the high load-bearing capacity and high reliability requirements of high-thrust rocket engines.

[0006] A spherical double pendulum constant-level seat for a high-thrust rocket engine includes: an upper support, a lower support, a connecting shaft, a force transmission block, and a self-locking nut;

[0007] The lower part of the upper support has a hemispherical force-transmitting groove, and the upper part of the lower support has a hemispherical force-transmitting body; the lower support is rotatably connected to the force-transmitting groove of the upper support through the force-transmitting body and the spherical force-transmitting surface, bearing the thrust of the rocket engine.

[0008] The force transmission block and the lower support are rotatably connected on the vertical plane;

[0009] The force transmission block is penetrated by the connecting shaft along its length; the upper support is rotatably connected to the force transmission block in the vertical plane via the connecting shaft; the rotation surface of the upper support is perpendicular to the rotation surface of the force transmission block.

[0010] The connecting shaft is fixedly connected to the force transmission block in its axial direction by the self-locking nut.

[0011] Preferably, the lower support includes a lower support body and a swing through groove disposed in the lower support body and adapted to the force transmission block; the force transmission block is disposed in the swing through groove; the force transmission block is rotatably connected to the swing through groove in the vertical direction; the force transmission block is limited by the inner wall of the swing through groove in other directions besides the vertical direction.

[0012] Preferably, the force transmission block includes a force transmission block body and a hemispherical protrusion fixedly connected to the force transmission block body; the upper end of the swing through groove has a hemispherical limiting groove; the hemispherical protrusion is adapted to the limiting groove; the hemispherical protrusion is rotatably connected to the limiting groove through a spherical force transmission surface.

[0013] Preferably, there is a swing gap between the upper surface of the force transmission block and the inner wall of the limiting groove for the force transmission block to rotate at a certain angle in the vertical direction.

[0014] Preferably, the force transmission block further includes a through hole extending through the force transmission block in its length direction; the through hole is adapted to the diameter of the connecting shaft; the length of the connecting shaft is greater than the length of the through hole; the connecting shaft is inserted into the through hole.

[0015] Preferably, the upper support further includes an upper support body and two lugs fixedly connected to the upper support body; the two lugs are symmetrically arranged on both sides of the force transmission groove axis; the lugs are provided with shaft holes adapted to the connecting shaft; the connecting shaft is inserted into the shaft holes and passes through the two lugs.

[0016] Preferably, the upper support further includes an upper support flange fixedly connected to the upper support body; the upper support flange is located at the upper end of the upper support body.

[0017] Preferably, the lower support further includes a lower support flange fixedly connected to the lower support body; the lower support flange is located at the lower end of the lower support body.

[0018] Compared with the prior art, this application has at least the following beneficial effects:

[0019] 1. This invention uses a spherical force transmission surface to bear the thrust of the engine. The spherical force transmission structure has high stiffness and small deformation, which can effectively improve the load-bearing capacity and reliability of the constant level seat.

[0020] 2. The present invention uses a spherical contact surface to transmit thrust, which can increase the contact area, reduce contact stress, and avoid the risk of glue and seizing.

[0021] 3. This invention enables bidirectional swinging of the constant level seat using only one connecting shaft, greatly reducing the complexity of the structure and improving the stability of the constant level seat.

[0022] 4. This invention uses a spherical force transmission surface to bear the thrust of the engine, which has a large safety margin and allows for appropriate weight reduction measures. This can effectively reduce the size and mass of the launch pad, thereby improving the rocket's carrying capacity. Attached Figure Description

[0023] The following sections will describe some specific embodiments of the invention in detail by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or portions. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings:

[0024] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0025] Figure 2 This is a schematic diagram of the forward structure of the present invention;

[0026] Figure 3 for Figure 2 A cross-sectional view at position AA in the middle;

[0027] Figure 4 This is a schematic diagram of the side structure of the present invention;

[0028] Figure 5 for Figure 4 A cross-sectional view at position BB in the middle;

[0029] Figure 6 This is a schematic diagram of the force transmission block of the present invention.

[0030] The above figures include the following reference numerals:

[0031] 1. Upper support; 2. Lower support; 3. Connecting shaft; 4. Self-locking nut; 5. Force transmission block; 11. Upper support body; 12. Upper support flange; 13. Force transmission groove; 21. Lower support body; 22. Lower support flange; 23. Force transmission body; 24. Swinging through groove; 25. Limiting groove; 26. Support lug; 27. Swinging clearance; 51. Force transmission block; 52. Hemispherical protrusion; 53. Through hole. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0033] like Figures 1-6 As shown, a spherical double pendulum constant level seat for a high-thrust rocket engine includes: an upper support 1, a lower support 2, a connecting shaft 3, a force transmission block 5, and a self-locking nut 4.

[0034] The lower part of the upper support 1 has a hemispherical force transmission groove 13, and the upper part of the lower support 2 has a hemispherical force transmission body 23; the lower support 2 is rotatably connected to the force transmission groove 13 of the upper support 1 through the force transmission body 23 via the spherical force transmission surface, and bears the thrust of the rocket engine.

[0035] The force transmission block 5 and the lower support 2 are rotatably connected on the vertical plane.

[0036] The force transmission block 5 is penetrated by the connecting shaft 3 along its length; the upper support 1 is rotatably connected to the force transmission block 5 on the vertical plane through the connecting shaft 3; the rotation surface of the upper support 1 is perpendicular to the rotation surface of the force transmission block 5.

[0037] The connecting shaft 3 is fixedly connected to the force transmission block 5 in its axial direction by a self-locking nut 4.

[0038] Specifically, the lower support 2 includes a lower support body 21 and a swing through groove 24 disposed in the lower support body 21 and adapted to the force transmission block 5. The force transmission block 5 is disposed in the swing through groove 24; the force transmission block 5 is rotatably connected to the swing through groove 24 in the vertical direction; the force transmission block 5 is limited by the inner wall of the swing through groove 24 in other directions besides the vertical direction.

[0039] The force transmission block 5 includes a force transmission block body 51 and a hemispherical protrusion 52 fixedly connected to the force transmission block body 51; the upper end of the swing through groove 24 has a hemispherical limiting groove 25; the hemispherical protrusion 52 is adapted to the limiting groove 25; the hemispherical protrusion 52 is rotatably connected to the limiting groove 25 through a spherical force transmission surface. The force transmission block body 51 is preferably a cuboid structure, its sidewalls are fitted with the limiting groove 25, and the hemispherical protrusion 52 is fixed on its upper surface.

[0040] A swing gap 27 is provided between the upper surface of the force transmission block 51 and the inner wall of the limiting groove 25 for the force transmission block 5 to rotate at a certain angle in the vertical direction. The size of the swing gap 27 depends on the swing angle of the upper support 1 relative to the lower support 2. The larger the required swing angle, the larger the swing gap 27 needs to be. In addition, the size of the swing gap 27 is also related to the length of the force transmission block 51. When the swing angle of the upper support 1 relative to the lower support 2 is the same, the longer the length of the force transmission block 51, the larger the swing gap 27 needs to be.

[0041] Furthermore, while ensuring that the hemispherical protrusion 52 and the limiting groove 25 can achieve a rotatable contact connection, the size of the swing gap 27 can be achieved by controlling the distance between the upper surface of the hemispherical protrusion 52 and the upper surface of the force transmission block 51. Similarly, while ensuring that the hemispherical protrusion 52 and the limiting groove 25 can achieve a rotatable contact connection, the size of the swing gap 27 can also be achieved by adjusting the depth of the limiting groove 25.

[0042] In addition, the force transmission block 51 also includes a through hole 53 extending through the force transmission block 51 along its length, the through hole 53 being adapted to the diameter of the connecting shaft 3. The length of the connecting shaft 3 is greater than the length of the through hole 53, and the connecting shaft 3 is inserted into the through hole 53. A self-locking nut 4 is fixed to the end of the connecting shaft 3 to limit the axial movement of the connecting shaft 3, so as to ensure that the connecting shaft 3 can always be inserted into the through hole 53.

[0043] The upper support 1 also includes an upper support body 11 and two lugs 26 fixedly connected to the upper support body 11. The two lugs 26 are symmetrically arranged on both sides of the axis of the force transmission groove 13. The lugs 26 are provided with shaft holes adapted to the connecting shaft 3, and the connecting shaft 3 is inserted into the shaft holes and passes through the two lugs 26.

[0044] The limiting effect of the connecting shaft 3 allows the hemispherical protrusion 52 to be tightly engaged with the limiting groove 25, and at the same time, it allows the force transmission body 23 to be tightly engaged with the force transmission groove 13. This achieves a rotatable contact connection between the upper support 1 and the lower support 2 through the spherical force transmission surface, and enables it to bear the thrust of the rocket engine.

[0045] When the engine is stationary, especially when the launch vehicle is in a horizontal position, the engine's gravity is transmitted through the spherical surface between the force transmission block 5 and the lower support 2. During engine operation, the engine thrust is transmitted through the spherical surface between support 1 and the lower support 2. The connecting shaft 3 and the force transmission block 5 do not bear thrust. The spherical fit has a large stiffness and contact area, resulting in small deformation and contact stress, thus ensuring the high reliability and high load-bearing capacity requirements of the constant-level seat.

[0046] In another embodiment of the present invention, the upper support 1 further includes an upper support flange 12 fixedly connected to the upper support body 11; the upper support flange 12 is located at the upper end of the upper support body 11. The upper support flange 12 is used for fixed connection between the upper support 1 and the engine frame.

[0047] In another embodiment of the present invention, the lower support 2 further includes a lower support flange 22 fixedly connected to the lower support body 21; the lower support flange 22 is located at the lower end of the lower support body 21. The lower support flange 22 is used for fixed connection between the lower support 2 and the engine thrust chamber.

[0048] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0049] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0050] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0051] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A spherical double pendulum constant-level seat for a high-thrust rocket engine, characterized in that, include: Upper support, lower support, connecting shaft, force transmission block, and self-locking nut; The lower part of the upper support has a hemispherical force-transmitting groove, and the upper part of the lower support has a hemispherical force-transmitting body; the lower support is rotatably connected to the force-transmitting groove of the upper support through the force-transmitting body and the spherical force-transmitting surface, bearing the thrust of the rocket engine. The force transmission block and the lower support are rotatably connected on the vertical plane; The force transmission block is penetrated by the connecting shaft along its length; the upper support is rotatably connected to the force transmission block in the vertical plane via the connecting shaft; the rotation surface of the upper support is perpendicular to the rotation surface of the force transmission block. The connecting shaft is fixedly connected to the force transmission block in its axial direction by the self-locking nut; The lower support includes a lower support body and a swing through groove disposed in the lower support body and adaptable to the force transmission block; the force transmission block is disposed in the swing through groove; the force transmission block is rotatably connected to the swing through groove in the vertical direction; the force transmission block is limited by the inner wall of the swing through groove in other directions other than the vertical direction; The force transmission block includes a force transmission block body and a hemispherical protrusion fixedly connected to the force transmission block body; the upper end of the swing through groove has a hemispherical limiting groove; the hemispherical protrusion is adapted to the limiting groove; the hemispherical protrusion is rotatably connected to the limiting groove through a spherical force transmission surface. The upper support also includes an upper support body and two lugs fixedly connected to the upper support body; the two lugs are symmetrically arranged on both sides of the force transmission groove axis; the lugs are provided with shaft holes adapted to the connecting shaft; the connecting shaft is inserted into the shaft holes and passes through the two lugs.

2. The spherical double pendulum constant level seat as described in claim 1, characterized in that, There is a swing gap between the upper surface of the force transmission block and the inner wall of the limiting groove, which allows the force transmission block to rotate at a certain angle in the vertical direction.

3. The spherical double pendulum constant level seat as described in claim 2, characterized in that, The force transmission block also includes a through hole that extends through the force transmission block along its length; the through hole is adapted to the diameter of the connecting shaft; the length of the connecting shaft is greater than the length of the through hole; the connecting shaft is inserted into the through hole.

4. The spherical double pendulum constant level seat as described in claim 3, characterized in that, The upper support also includes an upper support flange that is fixedly connected to the upper support body; the upper support flange is located at the upper end of the upper support body.

5. The spherical double pendulum constant level seat as described in claim 1, characterized in that, The lower support also includes a lower support flange that is fixedly connected to the lower support body; the lower support flange is located at the lower end of the lower support body.

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