Disc spring type shock absorber and stacked shock absorption module

Abstract

The disc spring type shock absorber is of a disc spring type structure and comprises a side wall, an upper end face and a lower end face, the side wall is an aspheric curved surface, the upper end face is arranged at the first end of the side wall and is an annular plane, and the lower end face is arranged at the second end, opposite to the first end, of the side wall and is an annular plane. The diameter of the lower end face is larger than that of the upper end face. The disc spring type design is adopted, the transverse rigidity of the shock absorber is greatly improved, then the shock absorption effect of precise axis orientation can be achieved, the problem of non-directional capacity caused by non-directional energy absorption of a conventional shock absorber is solved, and the directional precision and the transverse rigidity of a shock absorption system are improved.

Description

Technical Field

[0001] The present invention relates to the field of aerospace technology, and in particular to a disc spring shock absorber and a stacked shock absorption module. Background Art

[0002] During the launch, transportation and landing of a spacecraft, the spacecraft will be subject to various external vibrations, which may affect the stability and safety of the spacecraft, and even cause the spacecraft to malfunction. The spacecraft shock absorber is a device that can reduce the impact of external vibrations on the spacecraft. Its design principle is based on vibration damping and energy absorption. In the design of spacecraft, shock absorbers are usually installed around important parts of the spacecraft, such as the spacecraft's engine, fuel storage, etc. When the spacecraft is subjected to external vibrations, the shock absorber will reduce the impact of the vibration on the spacecraft by absorbing vibration energy and damping.

[0003] At present, the shock absorbers for anti-instantaneous large overload application scenarios mostly use silicone-based rubber pads, metal foam, metal rubber, and hydraulic dampers. However, due to the characteristics of the vibration-absorbing materials and the design of the shock absorbers, it is difficult to apply them to application scenarios where high-level impacts are to be reduced in a compact space. Specifically, existing shock absorbers usually need to be fixed at the front and rear ends of the vibration reduction link, and the local stress of the main structure is too large. Existing shock absorbers attenuate impact vibrations through their own non-directional energy absorption, and are difficult to apply to vibration reduction scenarios that require directional accuracy. Existing aerospace shock absorbers are mainly used to deal with frequency domain vibrations, and the attenuation methods for time domain vibration shocks are relatively scarce. The strength of most shock absorbers themselves is difficult to withstand the time domain level of nearly 10,000 g, such as 100,000 m / s 2 Large overload shocks of the magnitude of 1000 or above will lead to premature energy absorption saturation or direct damage, resulting in loss of vibration reduction performance. In addition, the energy storage density of existing shock absorbers is not enough to cope with high-level shocks, or the structural size envelope and mass will increase sharply, making it difficult to be effectively used. Summary of the invention

[0004] In view of some or all of the problems in the prior art, the present invention provides a disc spring type shock absorber in a first aspect, which adopts a disc spring type configuration and includes:

[0005] a side wall, which is an aspherical curved surface;

[0006] an upper end surface, which is disposed at the first end of the side wall and is an annular plane; and

[0007] The lower end surface is arranged at the second end of the side wall opposite to the first end thereof and is an annular plane, wherein the diameter of the lower end surface is greater than that of the upper end surface.

[0008] Furthermore, the width of the upper end surface is XXX.

[0009] Furthermore, the width of the lower end surface is not less than 5 mm.

[0010] Furthermore, the inner curvature radius of the side wall is 110 to 130 mm, and the outer curvature radius R o Determined according to the following formula:

[0011] R o =R i +b e ,

[0012]

[0013] Among them, R i is the inner curvature radius b of the side wall e is the effective thickness of the side wall, g s is the system impact acceleration, m s is the mass of the vibration-damped link, P M is the yield strength of the material, l δ It is the average of the inner arc length and the outer arc length in the shock absorber cross section.

[0014] Furthermore, the height of the side wall is 10 mm.

[0015] Furthermore, the lower end surface includes a plurality of bosses, and the plurality of bosses are circumferentially distributed on the lower end surface.

[0016] Furthermore, the cross section of the boss is trapezoidal.

[0017] Furthermore, the edge of the boss does not exceed the edge of the lower end surface.

[0018] Furthermore, the material of the shock absorber is titanium-based superelastic alloy.

[0019] Furthermore, the shock absorber is manufactured by an ultra-high temperature hot pressing integrated molding process.

[0020] Based on the disc spring shock absorber as described above, the second aspect of the present invention provides a stacked shock absorption module, which includes a plurality of shock absorbers as described above.

[0021] Furthermore, the number of the shock absorbers is 1 to 3.

[0022] Furthermore, the shock absorbers are stacked in the same direction.

[0023] Furthermore, the shock absorbers are stacked alternately in forward and reverse directions.

[0024] The disc spring shock absorber and stacked shock absorption module provided by the present invention adopt a disc spring design, which greatly improves the lateral stiffness of the shock absorber, thereby achieving a vibration reduction effect with precise axis orientation, solving the problem of non-directional ability caused by non-directional energy absorption of conventional shock absorbers, and improving the directional accuracy and lateral stiffness of the shock absorption system. The shock absorber adopts a strictly designed special curved surface shape and is integrally formed with high energy storage density materials, which can solve the problem that the shock absorber's own strength cannot cope with the time domain of nearly 10,000 g (100,000 m / s 2 The shock absorber can solve the problem of large overload impact (level), and significantly improve the quality-efficiency ratio of the shock absorber. At the same time, the bottom of the shock absorber is provided with a circumferentially evenly distributed trapezoidal boss slider, so that the shock absorber can meet the multi-degree-of-freedom constraints without local positioning, providing high-precision assembly positioning for the shock absorber, and at the same time ensuring the radial motion trajectory of the shock absorber when it is actuated. The shock absorber can be stacked in both directions, adapting to different vibration reduction scenarios without increasing the difficulty of the process, and has stronger adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] To further illustrate the above and other advantages and features of various embodiments of the present invention, a more specific description of various embodiments of the present invention will be presented with reference to the accompanying drawings. It will be understood that these drawings only depict typical embodiments of the present invention and are therefore not to be considered as limiting the scope thereof. In the accompanying drawings, for clarity, identical or corresponding parts will be represented by identical or similar reference numerals.

[0026] Figure 1 A schematic structural diagram of a disc spring shock absorber according to an embodiment of the present invention is shown;

[0027] Figure 2 A schematic diagram showing the distribution of bosses of a disc spring shock absorber according to an embodiment of the present invention;

[0028] Figure 3 A schematic cross-sectional view of a boss of a disc spring type shock absorber according to an embodiment of the present invention is shown;

[0029] Figure 4 A schematic structural diagram of a stacked vibration reduction module according to an embodiment of the present invention is shown;

[0030] Figure 5 A schematic side view of a stacked vibration reduction module according to an embodiment of the present invention is shown;

[0031] Figure 6 A schematic structural diagram showing a stacked vibration reduction module according to another embodiment of the present invention; and

[0032] Figure 7 A schematic side view of a stacked vibration reduction module according to yet another embodiment of the present invention is shown. DETAILED DESCRIPTION

[0033] In the following description, the present invention is described with reference to various embodiments. However, those skilled in the art will recognize that various embodiments can be implemented without one or more specific details or with other replacement and / or additional methods, materials or components. In other cases, well-known structures, materials or operations are not shown or described in detail to avoid blurring the inventive point of the present invention. Similarly, for the purpose of explanation, specific quantities, materials and configurations are set forth to provide a comprehensive understanding of embodiments of the present invention. However, the present invention is not limited to these specific details. In addition, it should be understood that the various embodiments shown in the drawings are illustrative representations and are not necessarily drawn in correct proportions.

[0034] In this specification, reference to "one embodiment" or "the embodiment" means that a particular feature, structure, or characteristic described in conjunction with the embodiment is included in at least one embodiment of the present invention. The phrase "in one embodiment" appearing in various places in this specification does not necessarily all refer to the same embodiment.

[0035] In the present invention, unless otherwise specified, "arranged on...", "arranged above..." and "arranged above..." do not exclude the existence of an intermediate between the two. In addition, "arranged on or above..." merely indicates the relative positional relationship between two components, and in certain cases, such as after reversing the product direction, it can also be converted into "arranged below or below...", and vice versa.

[0036] In the present invention, each embodiment is only intended to illustrate the aspects of the present invention and should not be construed as limiting.

[0037] In the present invention, unless otherwise specified, the quantifiers "a", "an" and "an" do not exclude the presence of a plurality of elements.

[0038] It should also be pointed out that in the embodiments of the present invention, for the sake of clarity and simplicity, only a portion of the parts or components may be shown, but a person of ordinary skill in the art will understand that under the teachings of the present invention, required parts or components may be added as needed in specific scenarios.

[0039] It should also be noted that within the scope of the present invention, the terms "same", "equal", "equal to" and the like do not mean that the values ​​of the two are absolutely equal, but allow a certain reasonable error, that is, the terms also cover "substantially the same", "substantially equal", "substantially equal to". By analogy, in the present invention, the terms "perpendicular to", "parallel to" and the like indicating directions also cover the meanings of "substantially perpendicular to" and "substantially parallel to".

[0040] In view of the problem that existing shock absorbers are difficult to adapt to application scenarios for reducing vibration of high-level impacts in compact spaces, the present invention provides a disc spring shock absorber and a stacked vibration reduction module, which are based on high energy storage density metal materials and a disc spring configuration, as well as circumferentially evenly distributed positioning bosses and an inverted stacking design, to solve the above-mentioned problems in the prior art.

[0041] The technical solution of the present invention is further described below in conjunction with the accompanying drawings of the embodiments.

[0042] Figure 1 FIG. 2 is a schematic diagram showing the structure of a disc spring shock absorber according to an embodiment of the present invention. Figure 1 As shown, a disc spring shock absorber adopts a disc spring configuration, including a side wall 101, an upper end face 102 and a lower end face 103, wherein the upper end face 102 and the lower end face 103 are respectively arranged at the first end and the second end of the side wall 101. The diameter of the side wall 101 gradually increases from the first end to the second end, so the diameter of the lower end face 103 is larger than the upper end face 102. The disc spring design can greatly improve the lateral stiffness of the shock absorber and achieve a vibration reduction effect with precise axis orientation, thereby solving the problem of non-directional ability caused by non-directional energy absorption of conventional shock absorbers and improving the directional accuracy and lateral stiffness of the vibration reduction system.

[0043] In one embodiment of the present invention, the disc spring shock absorber is made of a high energy storage density metal material, such as a high energy storage density titanium-based superelastic alloy, and the disc spring shock absorber is made of an ultra-high temperature hot pressing integrated molding process. In one embodiment of the present invention, the processing pressure of the disc spring shock absorber should be greater than the stress of plastic deformation of the high energy storage density metal material, that is, greater than the yield strength of the high energy storage density metal material. During actual processing, the actual pressure value can be determined according to the hot press. By adopting a high energy storage density metal material, the mass and size of the disc spring shock absorber are significantly reduced compared to shock absorbers of the same level of performance.

[0044] like Figure 1 As shown, in one embodiment of the present invention, the side wall 101 adopts a strictly designed special curved surface shape, such as an aspheric curved surface shape. In one embodiment of the present invention, the side wall 101 is an xxx type (such as a quadratic rotationally symmetric aspheric surface, a high-order rotationally symmetric aspheric surface, an off-axis aspheric surface, a complex surface, a multi-axis symmetric aspheric surface, etc.) aspheric surface. Specifically, in one embodiment of the present invention, the inner curvature radius R of the side wall 101 is i 110 to 130 mm, outer radius of curvature R O Determined according to the following formula:

[0045] R o =R i +b e ,

[0046]

[0047] Among them, b e is the effective thickness of the side wall, g s is the system impact acceleration, m s is the mass of the vibration-damped link, P M is the yield strength of the disc spring shock absorber, l δ is the average of the inner arc length and the outer arc length in the side wall section. In one embodiment of the present invention, the height of the side wall 101 is 10 mm. By adopting a strictly designed special curved surface shape and integrally forming with high energy storage density materials, the shock absorber can withstand a higher time domain large overload impact level, thereby solving the problem that the shock absorber's own strength cannot cope with the time domain nearly 10,000 g level (100,000 m / s 2 It can solve the problem of large overload impact of the shock absorber and significantly improve the quality-efficiency ratio of the shock absorber.

[0048] In one embodiment of the present invention, the upper end face 102 and the lower end face 103 are both annular planes, so the contact area between the shock absorber and the main structure can be effectively increased, the local stress of the main structure can be reduced, the force uniformity of the system can be optimized, and the stability and lateral stiffness can be effectively enhanced. In one embodiment of the present invention, the width of the upper end face 102 is xx, and the width of the lower end face 103 is the same as the width of the upper end face 102, which is xxx. In some embodiments of the present invention, the width of the lower end face 103 may also be slightly different from that of the upper end face 102, but the difference should not be greater than xxx.

[0049] In order to provide high-precision assembly positioning for the shock absorber, in one embodiment of the present invention, a plurality of bosses 104 are provided on the lower end surface 103 . Figure 2 A schematic diagram of boss distribution of a disc spring shock absorber according to an embodiment of the present invention is shown. Figure 2 As shown, the plurality of bosses 104 are circumferentially distributed on the lower end surface 103 . Figure 3 FIG. 2 is a schematic cross-sectional view of a boss of a disc spring type shock absorber according to an embodiment of the present invention. Figure 3 As shown, in one embodiment of the present invention, the boss 104 is a wedge-shaped boss slider, and the boss cross section is trapezoidal, which is arranged in the middle of the plane of the lower end surface 103, that is, the edge of the boss 104 does not exceed the edge of the lower end surface 103, so as to avoid stress concentration and damage. Correspondingly, the contact surface of the main structure needs to have a groove of the same width, and then the shock absorber can be fixed to the main structure through the cooperation between the boss 104 and the groove. With this connection method, the shock absorber can meet the multi-degree-of-freedom constraints without local positioning, and at the same time, it can ensure the radial motion trajectory of the shock absorber when it is actuated.

[0050] Based on the disc spring shock absorber as described above, the present invention further provides a stacked shock absorber module, which includes a plurality of shock absorbers 100 as described above, and the plurality of shock absorbers 100 are stacked in sequence. In an embodiment of the present invention, the plurality of shock absorbers 100 can be stacked in both positive and negative directions to adapt to different shock absorption scenarios without increasing the process difficulty, and have stronger adaptability. Figure 4 and Figure 5 A schematic diagram of the structure of a stacked vibration reduction module according to an embodiment of the present invention and a schematic diagram of its side view are shown. As shown in the figure, when the vibration reduction stiffness needs to be increased and the bearing capacity of the vibration reduction needs to be improved, the plurality of vibration reduction devices 100 can be stacked in a forward direction, that is, all the vibration reduction devices are in the same direction. Figure 4 and Figure 5 A schematic diagram of the structure of a stacked vibration reduction module according to an embodiment of the present invention is shown, and a schematic diagram of its side view. As shown in the figure, when it is necessary to increase the energy storage space of the vibration reducer and increase the stroke, a reverse stacking method can be adopted, that is, each vibration reducer is stacked alternately in the forward and reverse directions. In order to facilitate installation to the main structure, usually the bottom vibration reducer is in the forward direction, and the vibration reducer adjacent to it is placed in the reverse direction, and the stacking is alternated in this way. In one embodiment of the present invention, the vibration reduction module includes a maximum of 3 vibration reducers. It should be understood that in the reverse stacking structure, in order to ensure that each vibration reducer fits well, only the vibration reducer in contact with the main structure is provided with a boss, and the other vibration reducers do not need to be provided with a boss.

[0051] The present invention further provides a spacecraft, which includes the disc spring shock absorber and / or the stacked shock absorption module as described above. The stacked shock absorption module can be arranged in the engine, fuel storage, etc. of the spacecraft to reduce the vibration of these components during the launch, transportation and landing of the spacecraft.

[0052] The disc spring shock absorber and stacked shock absorption module provided by the present invention adopt a disc spring design, which greatly improves the lateral stiffness of the shock absorber, thereby achieving a vibration reduction effect with precise axis orientation, solving the problem of non-directional ability caused by non-directional energy absorption of conventional shock absorbers, and improving the directional accuracy and lateral stiffness of the shock absorption system. The shock absorber adopts a strictly designed special curved surface shape and is integrally formed with high energy storage density materials, which can solve the problem that the shock absorber's own strength cannot cope with the time domain of nearly 10,000 g (100,000 m / s 2 The shock absorber can solve the problem of large overload impact (level), and significantly improve the quality-efficiency ratio of the shock absorber. At the same time, the bottom of the shock absorber is provided with a circumferentially evenly distributed trapezoidal boss slider, so that the shock absorber can meet the multi-degree-of-freedom constraints without local positioning, providing high-precision assembly positioning for the shock absorber, and at the same time ensuring the radial motion trajectory of the shock absorber when it is actuated. The shock absorber can be stacked in both directions, adapting to different vibration reduction scenarios without increasing the difficulty of the process, and has stronger adaptability.

[0053] Although various embodiments of the present invention are described above, it should be understood that they are presented as examples only and not as limitations. It is obvious to those skilled in the relevant art that various combinations, modifications and changes can be made thereto without departing from the spirit and scope of the present invention. Therefore, the breadth and scope of the present invention disclosed herein should not be limited by the exemplary embodiments disclosed above, but should only be defined according to the attached claims and their equivalents.

Claims

1. A disc spring shock absorber, characterized in that: It adopts disc spring type configuration and includes: a side wall, which is an aspherical curved surface; an upper end surface, which is disposed at the first end of the side wall and is an annular plane; and The lower end surface is arranged at the second end of the side wall opposite to the first end thereof and is an annular plane, wherein the diameter of the lower end surface is greater than that of the upper end surface.

2. The disc spring shock absorber according to claim 1, characterized in that: The inner curvature radius R of the side wall i 110 to 130 mm, outer radius of curvature R O Determined according to the following formula: R o =R i +b e , Among them, b e is the effective thickness of the side wall, g s is the system impact acceleration, m s is the mass of the vibration-damped link, P M is the yield strength of the disc spring shock absorber, l δ It is the average of the inner arc length and the outer arc length in the side wall section.

3. The disc spring shock absorber according to claim 1, characterized in that: The height of the side wall is 10 mm.

4. The disc spring shock absorber according to claim 1, characterized in that: The lower end surface includes a plurality of bosses, which are circumferentially distributed on the lower end surface, and the edges of the bosses do not exceed the edges of the lower end surface.

5. The disc spring shock absorber according to claim 4, characterized in that: The cross section of the boss is trapezoidal.

6. The disc spring shock absorber according to claim 1, characterized in that: The shock absorber is made of titanium-based superelastic alloy and is manufactured by an ultra-high temperature hot pressing integrated molding process.

7. A stacked vibration reduction module, characterized in that: The invention comprises a plurality of vibration absorbers according to any one of claims 1 to 6, wherein the vibration absorbers are stacked in sequence.

8. The disc spring shock absorber according to claim 7, characterized in that: The number of the shock absorbers is 1 to 3.

9. The disc spring shock absorber according to claim 7, characterized in that: The shock absorbers are stacked in the same direction.

10. The disc spring type shock absorber according to claim 7, characterized in that: The shock absorbers are stacked alternately in forward and reverse directions.

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