Large-tolerance self-adaptive assembly joint for space assembly and spacecraft

Abstract

The invention provides a large-tolerance self-adaptive assembly joint for space assembly and a spacecraft. The method can be used in the technical field of spacecraft on-orbit assembly. The large-tolerance self-adaptive assembly joint for space assembly is provided with a mounting hole, and the mounting hole is at least used for being arranged on the outer side of a first connecting part and the outer side of a second connecting part in a sleeving mode. The large-tolerance self-adaptive assembly joint for space assembly is made of memory alloy, and the hole expansion rate of the large-tolerance self-adaptive assembly joint for space assembly is larger than or equal to 20%. The aperture of the mounting hole is adjustable, and when the aperture of the mounting hole is increased, the length of the large-tolerance self-adaptive assembly joint for space assembly is increased or decreased. According to the large-tolerance self-adaptive assembly joint for space assembly, the requirements for self-adaption and large assembly tolerance of the joint can be met by improving the structural design and the hole expansion rate of the joint.

Description

Technical Field

[0001] This application relates to the field of spacecraft on-orbit assembly technology, and in particular to a large tolerance adaptive assembly joint for space assembly and a spacecraft. Background Technology

[0002] In-orbit assembly technology is a key supporting technology for large-scale aerospace projects such as building large space stations, deploying giant antennas, and constructing solar power plants. In-orbit assembly typically involves the precise connection of multiple prefabricated modules or trusses in the space environment, and the performance of the connection interfaces directly determines the stability and reliability of the overall structure.

[0003] Currently, on-orbit assembly technology has become a core support for the construction, on-orbit maintenance, and functional expansion of large space structures, and the connection interface is a key component in the CNC assembly process. However, the aforementioned assembly joints suffer from problems such as lack of self-adaptability and small assembly tolerance. Summary of the Invention

[0004] This application provides a large tolerance adaptive assembly joint and a spacecraft for space assembly, in order to solve the problems of assembly joints that cannot be adaptive and have small assembly tolerance.

[0005] On the one hand, this application provides a large tolerance adaptive assembly joint for space assembly, the large tolerance adaptive assembly joint for space assembly having a mounting hole, the mounting hole being used at least for fitting onto the outside of the first connecting part and the second connecting part;

[0006] The material of the large tolerance adaptive assembly joint for space assembly includes shape memory alloy, and the hole expansion ratio of the large tolerance adaptive assembly joint for space assembly is greater than or equal to 20%; the diameter of the mounting hole is adjustable, and when the diameter of the mounting hole increases, the length of the large tolerance adaptive assembly joint for space assembly increases or decreases.

[0007] By adopting the above technical solution, the large-tolerance adaptive assembly joint for space assembly is made of shape memory alloy material, and the expansion rate of the mounting hole reaches more than 20%. The mounting hole can be fitted onto the outside of the first connecting part and the second connecting part, and the adaptive assembly function is realized by changing the diameter of the mounting hole. As the diameter increases, the overall length of the large-tolerance adaptive assembly joint for space assembly will show differentiated responses, specifically exhibiting two different modes: elongation or shortening.

[0008] In the specific implementation process, the assembly interface undergoes a hole-enlarging operation below the martensitic transformation end temperature (Mf) of its material, i.e., in the martensitic phase state, increasing the mounting hole diameter by more than 20% to accommodate a larger range of connecting components. Subsequently, the first and second connecting parts to be connected are placed in the mounting hole. When the temperature rises above the martensitic reverse transformation start temperature (As), the mounting hole of the SMA (Shape Memory Alloy) interface begins to shrink, generating a radial clamping force to secure the connecting components. Throughout the process, depending on the joint structure design, the overall length of the joint will lengthen or shorten as the mounting hole diameter increases, thereby achieving axial adaptive adjustment of the connecting components.

[0009] Understandably, compared to existing technologies that employ solid structures and are limited by the maximum 8% recoverable strain of SMA, resulting in hole expansion rates generally below 10% and weak tolerance capabilities, the large-tolerance adaptive assembly joint for space assembly provided in this application achieves a significant hole expansion capability exceeding 20%. This allows the large-tolerance adaptive assembly joint for space assembly to adapt to a wider range of first and second connecting parts, reducing the requirements for the machining accuracy of the first and second connecting parts. Simultaneously, the differentiated axial length changes accompanying the radial expansion of the large-tolerance adaptive assembly joint for space assembly provide additional adaptive adjustment capabilities for the connection process, better addressing complex assembly environments and diverse connection needs, thereby improving assembly tolerance.

[0010] In some embodiments of this application, when the diameter of the mounting hole is increased, the length of the large tolerance adaptive assembly joint for spatial assembly is reduced.

[0011] In some embodiments of this application, the large tolerance adaptive assembly joint for space assembly includes a plurality of annular structures arranged sequentially along the axial direction;

[0012] The ring structure includes a plurality of bends arranged in sequence, with the bends of two adjacent ring structures arranged opposite each other and together forming a pre-adjustment space;

[0013] When the diameter of the mounting hole increases, the two opposite bends move closer to each other, the area of ​​the pre-adjustment space decreases, and the circumferential length of the annular structure lengthens.

[0014] In some embodiments of this application, when the diameter of the mounting hole is increased, the length of the large tolerance adaptive assembly joint for spatial assembly is increased.

[0015] In some embodiments of this application, the large tolerance adaptive assembly joint for space assembly includes a plurality of connecting strips arranged sequentially along the circumferential direction;

[0016] The connecting strip extends along the axial direction of the mounting hole; when the diameter of the mounting hole increases, the distance between at least two of the connecting strips increases, and the length of the connecting strip increases.

[0017] In some embodiments of this application, the connecting strip includes a plurality of adjusting portions arranged sequentially along the axial direction of the mounting hole;

[0018] The adjusting part protrudes circumferentially along the mounting hole; on one side of the protruding adjusting part in the circumferential direction of the mounting hole, it is spaced apart from the adjacent connecting strip, and the other side of the adjusting part is connected to the adjacent connecting strip.

[0019] In some embodiments of this application, when the diameter of the mounting hole is increased, the length of the adjusting part is extended, and the distance between the protruding side of the adjusting part and the adjacent connecting strip is increased.

[0020] In some embodiments of this application, between two adjacent connecting strips, the side of the protruding adjustment portion in one connecting strip is spaced apart from the side of the protruding adjustment portion in the other connecting strip;

[0021] Between two adjacent connecting strips, one side of the recessed adjustment portion in one connecting strip is connected to the other side of the recessed adjustment portion in the other connecting strip by a connecting portion extending circumferentially along the mounting hole.

[0022] In some embodiments of this application, the length of the connecting portion is greater than the minimum distance between two adjacent connecting strips.

[0023] On the one hand, this application provides a spacecraft including a large-tolerance adaptive assembly joint for space assembly as described in any of the preceding claims.

[0024] Since the spacecraft includes a large tolerance adaptive assembly joint for space assembly according to any of the above embodiments, the advantages of the spacecraft including the large tolerance adaptive assembly joint for space assembly according to any of the above embodiments can be found in the relevant description above, and will not be repeated here. Attached Figure Description

[0025] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0026] Figure 1 A schematic diagram of the structure of a large-tolerance adaptive assembly joint for spatial assembly provided in an embodiment of this application. Figure 1 ;

[0027] Figure 2Front view of the large tolerance adaptive assembly joint for spatial assembly provided in the embodiments of this application. Figure 1 ;

[0028] Figure 3 Top view of the large tolerance adaptive assembly joint for spatial assembly provided in the embodiments of this application. Figure 1 ;

[0029] Figure 4 A schematic diagram of the structure of a large-tolerance adaptive assembly joint for spatial assembly provided in an embodiment of this application. Figure 2 ;

[0030] Figure 5 Front view of the large tolerance adaptive assembly joint for spatial assembly provided in the embodiments of this application. Figure 2 ;

[0031] Figure 6 Top view of the large tolerance adaptive assembly joint for spatial assembly provided in the embodiments of this application. Figure 2 ;

[0032] Figure 7 A schematic diagram of the assembly process of the large tolerance adaptive assembly joint for spatial assembly provided in this application embodiment. Figure 1 ;

[0033] Figure 8 A schematic diagram of the assembly process of the large tolerance adaptive assembly joint for spatial assembly provided in this application embodiment. Figure 2 ;

[0034] Figure 9 A schematic diagram of the assembly process of the large tolerance adaptive assembly joint for spatial assembly provided in this application embodiment. Figure 3 ;

[0035] Figure 10 A schematic diagram of the assembly process of the large tolerance adaptive assembly joint for spatial assembly provided in this application embodiment. Figure 4 .

[0036] Figure label:

[0037] 100. Large tolerance adaptive assembly joint for spatial assembly; 110. Mounting hole; 120. Annular structure; 121. Bending part; 122. Pre-adjustment space; 130. Connecting strip; 131. Adjustment part; 132. Connection part;

[0038] 200. First connecting part;

[0039] 300. Second connecting part.

[0040] The accompanying drawings have illustrated specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to specific embodiments. Detailed Implementation

[0041] As mentioned in the background technology, on-orbit assembly technology is a key supporting technology for large-scale aerospace projects such as building large space stations, deploying giant antennas, and constructing solar power plants. On-orbit assembly typically involves the precise connection of multiple prefabricated modules or trusses in the space environment, and the connection interface, as a key component in the CNC assembly process, must meet two core requirements: large assembly tolerance and self-adaptation.

[0042] Shape memory alloys (SMAs), due to their shape memory effect, generate large recovering strain and high restoring force, making them ideal materials for developing large-tolerance adaptive interfaces for space truss assemblies, such as nickel-titanium-niobium alloys. Utilizing their unique shape memory effect: at low temperatures (martensitic phase), the material is relatively soft, and the interface can be mechanically reoriented to produce martensitic strain, achieving aperture expansion; when the temperature rises above the initiation temperature of its inverse martensitic transformation, the material, due to its shape memory effect, outputs restoring stress and strain, driving the interface to radially contract, thereby clamping the members.

[0043] However, existing solid cylindrical configurations are limited by the macroscopic recoverable strain limit of SMA material itself (usually not exceeding 8%), making it difficult to exceed 10% in terms of effective hole expansion rate at the interface. Therefore, such interfaces can only accommodate small positive deviations in the outer diameter of the rods, and have weak compensation capabilities for dimensional machining errors that are difficult to completely avoid in aerospace manufacturing and assembly, as well as assembly alignment angle deviations (such as skewness during rod insertion) caused by complex environments such as microgravity and limited vision in orbit.

[0044] The assembly process places stringent requirements on the machining accuracy of connecting components and the instantaneous accuracy of assembly alignment, which limits its application in complex space missions that require rapid response and cannot meet the needs of future large-scale space infrastructure for high-tolerance and highly adaptive connection technologies.

[0045] Therefore, there is an urgent need for a large tolerance adaptive assembly joint for space assembly that can improve the assembly tolerance range and adaptability.

[0046] To address the technical problem of small assembly tolerance in existing SMA-based assembly joints, this application provides a large-tolerance adaptive assembly joint for space assembly. The large-tolerance adaptive assembly joint for space assembly is made of shape memory alloy material, and the expansion ratio of the mounting hole reaches over 20%. The mounting hole can be fitted onto the outside of the first and second connecting parts, and the adaptive assembly function is achieved by changing the diameter of the mounting hole. As the hole diameter increases, the overall length of the large-tolerance adaptive assembly joint for space assembly exhibits a differentiated response, specifically showing two different modes: elongation or shortening.

[0047] In practical implementation, the large-tolerance adaptive assembly joint for space assembly first undergoes a hole-expanding operation in the low-temperature martensitic state, increasing the mounting hole diameter by more than 20% to accommodate a larger range of connecting components. Subsequently, the first and second connecting parts to be connected are placed within the mounting hole. When the interface temperature rises above the initiation temperature of the martensitic reverse phase transformation, the mounting hole begins to shrink, generating a radial clamping force to secure the connecting components. Throughout this process, depending on the joint structure design, the overall length of the joint will lengthen or shorten as the mounting hole diameter increases, thereby achieving axial adaptive adjustment of the connecting components.

[0048] Understandably, compared to existing technologies that employ solid structures and suffer from low expansion rates and weak tolerances due to the low strain limit of the materials themselves, the large-tolerance adaptive assembly joint for space assembly provided in this application achieves a significant expansion capacity of over 20%. This allows the large-tolerance adaptive assembly joint for space assembly to adapt to a wider range of first and second connecting parts, reducing the requirements for the machining accuracy of the first and second connecting parts. Simultaneously, the differentiated axial length changes accompanying the radial expansion of the large-tolerance adaptive assembly joint for space assembly provide additional adaptive adjustment capabilities for the connection process, better addressing complex assembly environments and diverse connection needs, thereby improving assembly tolerance.

[0049] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses consistent with some aspects of this application as detailed in the appended claims.

[0050] In the embodiments of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of this application, unless otherwise stated, "multiple" means two or more.

[0051] Furthermore, in the embodiments of this application, the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0052] In the embodiments of this application, unless otherwise explicitly specified and limited, the terms "installation", "connection", "linking", "fixing", etc., should be interpreted broadly. For example, they can be fixed connections, detachable connections, or integrated; they can be direct connections or indirect connections through an intermediate medium; they can be connections within two components or interactions between two components.

[0053] In embodiments of this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, article, or apparatus that includes that element.

[0054] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0055] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0056] This application provides a large-tolerance adaptive assembly joint 100 for spatial assembly, wherein the large-tolerance adaptive assembly joint 100 for spatial assembly may have a mounting hole 110. The mounting hole 110 can be used to fit onto the outside of the first connecting portion 200 and the second connecting portion 300.

[0057] Mounting hole 110 penetrates the body of large-tolerance adaptive assembly joint 100 for spatial assembly, forming a through cavity for accommodating connecting parts 132. A variable inner diameter space can be provided to achieve containment and docking of at least two connecting parts 132.

[0058] The inner diameter of the mounting hole 110 can be changed according to changes in the external environment (such as temperature changes), so that the large tolerance adaptive assembly joint 100 for space assembly has a large inner diameter in one state to allow the connector 132 to enter, and shrinks in another state to apply a radial clamping force to the connector 132, thereby achieving mechanical connection and fastening.

[0059] The mounting hole 110 can simultaneously accommodate the ends or connecting segments of the first connecting portion 200 and the second connecting portion 300, and allows the large tolerance adaptive assembly joint 100 for spatial assembly to be fitted onto the outer circumferential surfaces of the first connecting portion 200 and the second connecting portion 300.

[0060] In this way, the large tolerance adaptive assembly joint 100 for spatial assembly can be set as an external connecting sleeve, which can constrain and lock the first connecting part 200 and the second connecting part 300 covered by it through its own deformation and recovery, thereby realizing the indirect connection and force transmission between the first connecting part 200 and the second connecting part 300.

[0061] For example, the mounting hole 110 can be configured as a cylindrical or near-cylindrical channel that passes through the axial direction of the large tolerance adaptive assembly joint 100 for spatial assembly. The inner surface of the mounting hole 110 can be adapted to the shape of the outer surface of the first connecting part 200 and the second connecting part 300, for example, both being circular, to ensure effective circumferential contact and clamping.

[0062] In the assembled state, the ends of the first connecting portion 200 and the second connecting portion 300 can be inserted into the mounting hole 110 relative to each other. The large tolerance adaptive assembly joint 100 for spatial assembly can be integrally fitted over the overlapping area of ​​the first connecting portion 200 and the second connecting portion 300. The length of the mounting hole 110 must be at least sufficient to cover the sections of the first connecting portion 200 and the second connecting portion 300 that need to be connected.

[0063] For example, the first connecting part 200 and the second connecting part 300 can be two rods in a space truss, a connecting boss on a device module, or any other mechanical component that needs to be assembled and docked in orbit.

[0064] By fitting the large tolerance adaptive assembly joint 100 for space assembly onto the outside of the first connecting part 200 and the second connecting part 300, the radial contraction force of the large tolerance adaptive assembly joint 100 for space assembly will act simultaneously on the first connecting part 200 and the second connecting part 300, thereby establishing a reliable mechanical connection between them.

[0065] The material of the large-tolerance adaptive assembly joint 100 for space assembly can include shape memory alloys. The expansion ratio of the large-tolerance adaptive assembly joint 100 for space assembly can be greater than or equal to 20%.

[0066] Shape memory alloys are a class of special metallic materials that can undergo reversible phase transformations between two or more crystalline phases under the stimulation of an external temperature field, accompanied by a significant recovery of their macroscopic shape.

[0067] Specifically, the large tolerance adaptive assembly joint 100 for space assembly can be designed to mechanically reorient the martensite to output strain when entering the martensitic phase at low temperatures, thereby allowing for a large degree of mechanical pore enlargement; when the temperature rises above its martensitic reverse phase transformation initiation temperature, the material will drive the joint to recover to its original shape or size, generating significant recovery stress and strain.

[0068] The expansion rate is defined as the relative rate of change between the maximum allowable inner diameter and the initial reference inner diameter of the mounting hole 110 of the large tolerance adaptive assembly joint 100 for spatial assembly, under preset conditions.

[0069] The expansion ratio characterizes the range of radial dimension adaptability of the large-tolerance adaptive assembly joint 100 for space assembly. An expansion ratio greater than or equal to 20% means that the inner diameter of the mounting hole 110 can be significantly expanded.

[0070] The diameter of the mounting hole 110 is adjustable. When the diameter of the mounting hole 110 is increased, the length of the large tolerance adaptive assembly joint 100 for space assembly can be increased or decreased.

[0071] For example, under conditions below the martensitic transformation temperature of the material, a mechanical force is applied to the large tolerance adaptive assembly joint 100 for space assembly, causing the inner diameter of the mounting hole 110 to be expanded to a target value, at which point the material is in a deformable martensitic state; subsequently, without external constraints or after assembly with the connected parts 132, when the ambient temperature rises above the austenitic transformation temperature, the shape memory effect drives the material to attempt to restore its preset shape and size, thereby causing the inner diameter of the mounting hole 110 to shrink, and when its inner diameter shrinks to the outer diameter of the connected part, a clamping force is generated on the connected part.

[0072] As the diameter of the mounting hole 110 increases, the overall length of the large tolerance adaptive assembly joint 100 for spatial assembly will change synchronously, and there are three possible trends: length increases, length decreases, or length remains unchanged.

[0073] For example, when the structure of the large-tolerance adaptive assembly joint 100 for spatial assembly is designed with a topological pattern (such as a honeycomb) having a positive Poisson's ratio effect, the material will typically shrink axially when the aperture is increased under radial tension, resulting in a reduction in the overall length of the joint. Conversely, when a topological pattern with a negative Poisson's ratio effect is used, the structure will stretch axially when the aperture is increased under radial tension, resulting in an increase in the overall length of the joint.

[0074] Thus, while the large tolerance adaptive assembly joint 100 for space assembly completes the radial clamping function, it can actively select to apply axial centering thrust or additional axial clamping force to the first connecting part 200 and the second connecting part 300 during the assembly process according to different application scenario requirements. This solves the radial tolerance and locking problem, and can further optimize the stress state of the connection interface, compensate for axial clearance, and improve the overall rigidity and reliability of the connection.

[0075] The large-tolerance adaptive assembly joint 100 for spatial assembly provided in this application embodiment achieves a significant hole enlargement capability of over 20%, enabling it to adapt to a wider range of sizes for the first connecting portion 200 and the second connecting portion 300. This reduces the requirements for the machining accuracy of the first connecting portion 200 and the second connecting portion 300, and increases the assembly alignment tolerance. Simultaneously, the differentiated axial length change accompanying the radial expansion of the large-tolerance adaptive assembly joint 100 provides additional adaptive adjustment capability for the connection process, better addressing complex assembly environments and diverse connection requirements, thereby improving assembly tolerance.

[0076] As a specific embodiment of this application, when the diameter of the mounting hole 110 is increased, the length of the large tolerance adaptive assembly joint 100 for spatial assembly can be reduced.

[0077] During the low-temperature expansion operation of the mounting hole 110 in the space assembly large tolerance adaptive assembly joint 100 to accommodate the first connecting part 200 and the second connecting part 300, not only will the inner diameter increase, but its overall dimension along the axial direction will also decrease simultaneously.

[0078] The large tolerance adaptive assembly joint 100 for spatial assembly can be configured as a structure with an equivalent positive Poisson's ratio effect, which will produce a shrinkage response in the axial direction when stretched in the circumferential direction.

[0079] For example, for a topology design with positive Poisson bit properties, its height h can be shortened to h1 after the hole is enlarged, and its height can be extended from h1 to h2 after assembly, heating and clamping. This axial extension can generate axial thrust during assembly, which helps the rods to automatically center and eliminate radial clearance. It is suitable for non-vibration scenarios with frequent thermal cycling or precision assembly.

[0080] The large-tolerance adaptive assembly joint 100 for spatial assembly may include a series of honeycomb-like, mesh-like, or other periodically perforated unit structures arranged circumferentially. When a radially outward expansion force is applied to the mounting hole 110 from the inside, these unit structures are stretched circumferentially, and the geometry of their unit walls or connecting hinges causes the structure to naturally shrink and deform axially.

[0081] Another exemplary implementation may include multiple annular structure 120-shaped units stacked or arranged axially. When these units expand radially, their own bending or tilting causes them to move closer to each other axially, thereby reducing the overall stack height and achieving axial shortening.

[0082] When the large tolerance adaptive assembly connector 100 for spatial assembly is enlarged at low temperature in preparation for assembly, its length is automatically shortened, which can provide additional space margin for the end faces of the first connection part 200 and the second connection part 300 to be connected to approach or contact each other.

[0083] Subsequently, as the temperature rises and the large-tolerance adaptive assembly joint 100 for spatial assembly returns to its original shape, the inner diameter of the mounting hole 110 contracts to radially clamp the connecting parts 132, and the joint length begins to increase in the opposite direction from its shortened state. This elongation process can be converted into applying an axial thrust or tension force to the clamped first connecting part 200 and second connecting part 300. This thrust helps eliminate axial gaps between the connecting parts 132, promotes close contact of the mating end faces, and achieves a certain degree of automatic alignment, suitable for precision assembly scenarios with high requirements for connection coaxiality or end face fit.

[0084] By constructing this deformation mode that couples radial expansion and axial contraction, the large-tolerance adaptive assembly joint 100 for space assembly extends the single radial assembly action into a composite assembly action that coordinates radial and axial movements. This not only simplifies the assembly operation but also introduces a beneficial axial force adjustment mechanism at the connection interface. During the hole-expanding stage, axial shortening creates favorable conditions for docking; during the locking recovery stage, axial elongation can actively apply axial preload or centering force. This bidirectional axial adaptive behavior effectively improves the tightness, centering, and overall stiffness of the connection, enabling the large-tolerance adaptive assembly joint 100 for space assembly to achieve large-tolerance radial clamping while also optimizing the axial connection state, thereby adapting to more complex and precise assembly requirements.

[0085] See Figures 1 to 3 As a specific embodiment of this application, the large tolerance adaptive assembly joint 100 for space assembly may include a plurality of annular structures 120 arranged sequentially along the axial direction.

[0086] The ring structure 120 can be a closed-loop structure with elasticity and shape memory characteristics. Multiple ring structures 120 can be stacked, connected in series or combined in other ways along the axial direction to form the main body of the large tolerance adaptive assembly joint 100 for space assembly.

[0087] The overall axial stiffness and deformation behavior of the large tolerance adaptive assembly joint 100 for spatial assembly can be flexibly adjusted by adjusting the number, spacing and connection method of the annular structure 120.

[0088] Specifically, the annular structure 120 may include a plurality of bends 121 arranged in sequence. The bends 121 of two adjacent annular structures 120 may be arranged opposite to each other and together form a pre-adjustment space 122.

[0089] The bend 121 can be a region on the annular structure 120 that undergoes bending, torsion, or hinge deformation. For example, the bend 121 can be designed as a strip-shaped region such as a V-shaped or U-shaped groove. Multiple bends 121 are connected end to end along the circumference of the annular structure 120, which together can form the basic outline of the annular structure 120.

[0090] The bends 121 of two adjacent annular structures 120 are offset from each other in the axial direction. For example, a concave area of ​​a bend 121 of the previous annular structure 120 is directly opposite a convex area of ​​the corresponding bend 121 of the next annular structure 120. The concave area and the convex area are opposite each other in the axial direction, thereby defining a closed or semi-closed cavity area, namely the pre-adjustment space 122, between them.

[0091] The shape and initial size of the pre-adjustment space 122 are determined by the specific shapes of the two opposing bends 121 and the axial distance between them. The pre-adjustment space 122 is not a fixed structural gap, but an adjustable cavity whose size changes dynamically as the annular structure 120 deforms.

[0092] like Figure 2 As shown by the dashed line, when the diameter of the mounting hole 110 increases, the two opposing bends 121 can move closer to each other, the area of ​​the pre-adjustment space 122 decreases, and the circumferential length of the annular structure 120 extends.

[0093] As the diameter of the mounting hole 110 increases, radial expansion is transmitted to each annular structure 120, forcing the circumferential length of each annular structure 120 to elongate. At this time, the two oppositely arranged bends 121 will move relative to each other under this deformation drive, moving closer to each other. This movement of moving closer to each other will reduce the axial dimension or overall area of ​​the pre-adjustment space 122 formed by them.

[0094] The reduction of the pre-adjustment space 122 can transform a portion of the geometric area originally occupied by this space into the space compensation required for the circumferential elongation deformation of the material of the ring structure 120. In other words, the reduction of the area of ​​the pre-adjustment space 122 accommodates the redistribution of material caused by the change in angle or displacement of the bending part 121.

[0095] By employing multiple annular structures 120 with bends 121 arranged along the axis, and utilizing the pre-adjustment space 122 formed by adjacent bends 121, the increase in aperture is decomposed into the coordinated deformation of multiple annular structures 120. When the mounting hole 110 is enlarged, the relative bends 121 move closer together, causing the pre-adjustment space 122 to contract, allowing the circumferential length of each annular structure 120 to extend smoothly. This improves the uniformity and reliability of structural deformation while achieving aperture adjustment, and also helps to disperse stress.

[0096] As a specific embodiment of this application, when the diameter of the mounting hole 110 is increased, the length of the large tolerance adaptive assembly joint 100 for spatial assembly can be increased.

[0097] While performing a low-temperature hole enlargement operation on the large tolerance adaptive assembly joint 100 for space assembly to enlarge the inner diameter of its mounting hole 110, the total dimension of the large tolerance adaptive assembly joint 100 for space assembly along its own axis will increase simultaneously.

[0098] For topology designs with negative Poisson bit properties, after hole enlargement, its height h can be extended to h1, while after assembly, heating and clamping, its height can be shortened from h1 to h2. This axial shortening can apply a strong axial clamping force to the rod, effectively eliminate axial clearance and improve locking strength, and is suitable for long-term service structures subjected to vibration, impact or high load.

[0099] For example, the large-tolerance adaptive assembly joint 100 for space assembly can be a concave honeycomb structure, a hinged star-shaped mesh structure, or composed of a series of circumferentially arranged and axially interconnected link units. When a radially outward expansion force is applied from the inside, the connecting units or nodes will rotate and displace, causing the mounting hole 110 to be stretched in the radial direction, while the large-tolerance adaptive assembly joint 100 for space assembly is simultaneously stretched in the axial direction, thereby increasing the overall length.

[0100] Another exemplary implementation is that the large tolerance adaptive assembly joint 100 for spatial assembly can be composed of multiple layers of axially arranged spiral or wave-shaped elastic bands, which change the spiral angle or waveform when subjected to radial tension, thereby increasing the axial projection length.

[0101] When the large tolerance adaptive assembly joint 100 for spatial assembly is expanded at low temperature to accommodate the first connecting part 200 and the second connecting part 300, the synchronous increase in its axial length is equivalent to actively providing an axial guiding or clearance space for the insertion of the first connecting part 200 and the second connecting part 300, which is beneficial to compensate for the loss of effective axial insertion depth caused by the alignment angle deviation.

[0102] Subsequently, as the temperature rises and the shape memory effect drives the joint to recover, the inner diameter of the mounting hole 110 will shrink to radially tighten the connecting part 132, and the overall length of the large tolerance adaptive assembly joint 100 for space assembly will start to shorten in the opposite direction from the increased state.

[0103] At this point, the large-tolerance adaptive assembly joint 100 for space assembly applies an additional axial clamping or tensile force to the connecting parts 132 that have already been radially clamped. This axial force can actively eliminate any axial gaps that may exist at the connection interface and pull or press the connecting parts 132 together more tightly, thereby significantly enhancing the tensile, compressive, and shear resistance of the connection, making it suitable for long-term service structures that need to withstand vibration, impact, or high loads.

[0104] By constructing the large-tolerance adaptive assembly joint 100 for space assembly with a topological configuration exhibiting an equivalent negative Poisson's ratio effect, its overall length increases synchronously as the diameter of the mounting hole 110 increases. This allows the large-tolerance adaptive assembly joint 100 to not only obtain radial containment space during the low-temperature hole expansion stage but also to generate axial extension to compensate for assembly alignment deviations. In the subsequent temperature recovery stage, the reverse shortening of the length of the large-tolerance adaptive assembly joint 100 can be converted into additional axial clamping force on the connecting parts 132, which, together with the radial clamping force, forms a multi-dimensional fastening force field, thereby improving the overall integrity of the connection, its load-bearing capacity, and its long-term service stability.

[0105] See Figures 4 to 6 As a specific embodiment of this application, the large tolerance adaptive assembly joint 100 for space assembly may include a plurality of connecting strips 130 arranged sequentially along the circumference.

[0106] The connecting strip 130 can be a slender strip or band structure extending axially along the large tolerance adaptive assembly joint 100 for spatial assembly. Multiple connecting strips 130 can be arranged around the axis of the mounting hole 110 to form an approximately cylindrical frame.

[0107] The connecting strip 130 can extend along the axial direction of the mounting hole 110. When the diameter of the mounting hole 110 increases, the distance between at least two connecting strips 130 increases, and the length of the connecting strip 130 increases.

[0108] like Figure 5 As shown by the dashed line, during operation, when the diameter of the mounting hole 110 increases, the distance between the two connecting strips 130 increases. The distance between the two connecting strips 130 can refer to the interval or gap between adjacent or close connecting strips 130 in the circumferential direction. The increase in distance means that the overall circumference of the large tolerance adaptive assembly joint 100 for spatial assembly increases, which can be achieved by separating the connecting strips 130 from each other in the circumferential direction.

[0109] Meanwhile, to accommodate the increased aperture and the accompanying increase in circumference, the length of the connecting strip 130 itself can also be increased. For example, the connecting strip 130 can be a solid strip with good axial tensile elasticity, or it can be a deployable chain structure composed of multiple shorter segments connected in series. Under the action of the radial expansion force, these segments unfold, resulting in an increase in the overall projected length.

[0110] By employing multiple axially extending connecting strips 130 arranged circumferentially, the large-tolerance adaptive assembly joint 100 for spatial assembly increases the circumferential distance between the connecting strips 130 to achieve circumferential expansion when the diameter of the mounting hole 110 increases. Simultaneously, the length of the connecting strips 130 themselves increases synchronously to adapt to geometric coordination. This allows radial expansion to naturally couple with controllable axial elongation, providing a structural path for achieving a large hole expansion ratio.

[0111] As a specific embodiment of this application, the connecting strip 130 may include a plurality of adjusting portions 131 arranged sequentially along the axial direction of the mounting hole 110.

[0112] Each adjustment section 131 can be a functional range on the connecting strip 130. Multiple adjustment sections 131 are connected end to end to form a complete connecting strip 130. By adopting a segmented adjustment section 131 design, the overall continuous axial deformation of the connecting strip 130 can be discretized into the coordinated deformation of multiple local adjustment sections 131.

[0113] The adjustment part 131 can be provided to protrude circumferentially along the mounting hole 110. On one side of the adjustment part 131 protruding in the circumferential direction of the mounting hole 110, it can be provided at intervals with the adjacent connecting strip 130, and the other side of the adjustment part 131 can be connected to the adjacent connecting strip 130.

[0114] The main body of the adjusting part 131 is not located entirely on the nominal axial straight line of the connecting strip 130, but protrudes or bends to the side of the connecting strip 130, that is, in the circumferential direction of the mounting hole 110, forming a protruding structure. This protrusion can be an arc-shaped protrusion, a bend, a wavy crest or trough, etc.

[0115] Since the adjusting part 131 protrudes circumferentially, its outermost protruding point or surface will maintain a certain gap with the adjacent connecting strip 130 in the circumferential direction. The size of this gap can change with the overall deformation of the large tolerance adaptive assembly joint 100 for spatial assembly, providing the necessary space margin for the circumferential swing or displacement of the adjusting part 131 and avoiding structural interference during deformation.

[0116] Meanwhile, in addition to the side with a protrusion forming a gap, the opposite side of the adjustment part 131 can be fixed or hinged to the adjacent connecting strip 130. The connection method can be welding, connection through intermediate connecting parts (such as short connecting rods, hinges, elastic bridges), or natural formation as part of an integral structure during additive manufacturing or laser cutting.

[0117] By constructing the connecting strip 130 as multiple circumferentially protruding adjustment parts 131, with a gap between the protruding side and the adjacent connecting strip 130, and a connection to the adjacent connecting strip 130 on the other side, a mesh structure with high deformation coordination capability is constructed. The protruding feature of the adjustment part 131 enables it to effectively convert radial expansion into its own bending or tilting deformation, thereby absorbing circumferential strain and promoting axial deformation; the gap on the protruding side provides the necessary degrees of freedom of movement and prevents interference, while the connection on the other side ensures force transmission and structural integrity. This allows the large-tolerance adaptive assembly joint 100 for spatial assembly to achieve smoother, more uniform, and larger-amplitude aperture adjustment and axial length variation, while optimizing stress distribution and improving the reliability and durability of the structure under repeated deformation.

[0118] As a specific embodiment of this application, when the diameter of the mounting hole 110 is increased, the length of the adjusting part 131 can be extended, and the distance between the protruding side of the adjusting part 131 and the adjacent connecting strip 130 can be increased.

[0119] The elongation of the length of the adjustment part 131 can refer to the increase in the size of the adjustment part 131 in the main extension direction, which is the result of the relative displacement of the unfoldable structure such as the hinge and fold inside the adjustment part 131.

[0120] The increase in aperture can be transmitted to each adjustment part 131 through the overall structure of the large tolerance adaptive assembly joint 100 for space assembly, and is converted into a tensile force or unfolding driving force on the adjustment part 131 in the axial direction, thereby causing its length to increase. The cumulative elongation effect of multiple adjustment parts 131 in the axial direction together increases the total length of the large tolerance adaptive assembly joint 100 for space assembly.

[0121] At the same time, the distance between the protruding side of the adjusting part 131 and the adjacent connecting strip 130 also increases. This distance can refer to the straight line or arc interval between the most protruding point or surface of the adjusting part 131 and the corresponding structural point or surface of the nearest other connecting strip 130 in the circumferential direction of the mounting hole 110.

[0122] The increase in distance means that the two adjacent connecting strips 130 are pushed further apart in the circumferential direction. This is due to the circumferential translation of each connecting strip 130 caused by the enlargement of the overall aperture. On the other hand, it is also due to the lateral displacement of the protruding part of the adjusting part 131 relative to the main body of the connecting strip 130 in space during the axial elongation process, due to its specific geometric configuration (such as tilting, bending or hinge design), thereby amplifying the increase in the circumferential spacing.

[0123] By designing the adjustment section 131 to generate synergistic deformation of axial elongation and circumferential spacing when the aperture increases, a highly efficient strain transfer and amplification mechanism is achieved. The axial elongation of the adjustment section 131 causes the overall axial extension of the large-tolerance adaptive assembly joint 100 for space assembly, while the increase in the circumferential distance between the protruding side and the adjacent connecting strip 130 expands the aperture. These two deformations are coupled through the geometric configuration of the adjustment section 131, enabling the large-tolerance adaptive assembly joint 100 for space assembly to achieve significant overall radial expansion and axial extension with relatively low local material strain, thereby significantly improving the aperture expansion capacity and deformation efficiency, while also facilitating stress dispersion.

[0124] As a specific embodiment of this application, between two adjacent connecting strips 130, the side of the adjusting part 131 protruding in one connecting strip 130 can be spaced apart from the side of the adjusting part 131 protruding in the other connecting strip 130.

[0125] Between two adjacent connecting strips 130, one side of the adjusting part 131 in one connecting strip 130 can be connected to the other side of the adjusting part 131 in the other connecting strip 130 via a connecting part 132, which extends circumferentially along the mounting hole 110.

[0126] For two adjacent connecting strips 130, the side of the adjusting part 131 on one connecting strip 130 that protrudes circumferentially along the mounting hole 110 and the side of the corresponding adjusting part 131 on the other connecting strip 130 that protrudes circumferentially along the mounting hole 110 are arranged in a spatially spaced manner. This provides the necessary degrees of freedom for the relative movement of the two protrusions during the overall deformation process of the large tolerance adaptive assembly joint 100 for spatial assembly. This allows them to move closer or further away from each other without interference, thereby ensuring that the functional deformation of the protruding side of the adjusting part 131 can proceed smoothly. For example, when the aperture increases, the distance between the two relatively protruding sides can be significantly increased to accommodate circumferential expansion.

[0127] Meanwhile, between two adjacent connecting strips 130, the side of the adjusting portion 131 on one connecting strip 130 that is recessed (i.e. the side opposite to the protruding side) and the side of the corresponding adjusting portion 131 on the other connecting strip 130 that is recessed can be connected to each other through the connecting portion 132.

[0128] The connecting portion 132 can be a structural element extending circumferentially along the mounting hole 110. For example, the connecting portion 132 can be a short beam, an arc-shaped bridging piece, a flexible hinge, or an additively manufactured connecting material. The orientation of the connecting portion 132 can be generally parallel to the circumferential tangent direction of the mounting hole 110, thereby establishing a circumferential force transmission channel with a certain rigidity between the concave sides of adjacent connecting strips 130.

[0129] By setting the protruding sides of the opposing adjustment parts 131 as a gap between adjacent connecting strips 130, and connecting the concave sides of the opposing adjustment parts 131 to each other through circumferentially extending connecting parts 132, the deformation and load-bearing functions are optimized. The protruding side gap provides the necessary degrees of freedom of movement for the adjustment parts 131 during radial deformation, ensuring low resistance and a large aperture adjustment capability; the circumferential connecting parts 132 on the concave side maintain the structural continuity and mechanical coupling between adjacent connecting strips 130, effectively transferring circumferential and radial loads, and enhancing the overall stiffness and structural stability of the large-tolerance adaptive assembly joint 100 for spatial assembly, thereby enabling it to reliably withstand various loads under complex working conditions while achieving a wide range of adaptive deformation.

[0130] As a specific embodiment of this application, the length of the connecting portion 132 can be greater than the minimum distance between two adjacent connecting strips 130.

[0131] The length of the connecting portion 132 can refer to the effective span or geometric dimension of the connecting portion 132 in its main extension direction. The minimum distance between two adjacent connecting strips 130 can refer to the shortest straight-line distance or normal distance measured along the extension direction of the connecting portion 132 between two corresponding concave side connection points or connection areas connected by the connecting portion 132 on the two connecting strips 130 in any working state of the large tolerance adaptive assembly joint 100 for spatial assembly.

[0132] Because the length of the connecting portion 132 is greater than the minimum connection distance, when the large-tolerance adaptive assembly joint 100 for spatial assembly is in its initial or unexpanded state, the connecting portion 132 may be in a relaxed, slightly bent, or pre-tensioned state. When the diameter of the mounting hole 110 increases due to assembly requirements, the circumferential spacing between adjacent connecting strips 130 increases accordingly, and the effective distance between the two concave side connection points also changes accordingly. At this time, the longer connecting portion 132 can adapt to this increase in distance through its own stretching, straightening, or elastic elongation, without immediately becoming a rigid element that restricts deformation or generates excessive internal constraints, thereby ensuring that the radial expansion process can proceed smoothly and with low resistance.

[0133] By designing the connecting part 132 to be longer than the minimum distance between two adjacent connecting bars 130, the connecting part 132 has a geometric margin of relaxation or pre-bending in the initial state. This allows the connecting part 132 to adapt to the increase in the distance between connection points through its own expansion or elastic elongation during the process of increasing the aperture of the large tolerance adaptive assembly joint 100 for spatial assembly, ensuring smooth radial expansion. At the same time, in the locked state, its geometric margin can effectively accommodate small deformations, buffer dynamic loads, and disperse local stresses. Thus, while maintaining the necessary mechanical constraints between adjacent connecting bars 130, it improves the structure's adaptability to deformation, the flexibility of the connection, and the overall fatigue resistance reliability.

[0134] As a specific embodiment of this application, the chemical composition of the shape memory alloy used in the large tolerance adaptive assembly joint 100 for space assembly can be Ni53-xTi. 47 Nbx, where 8.5≤x≤9.5. That is, the atomic percentage content of Ni is (100-47-x)%, the atomic percentage content of Ti is 47%, and the atomic percentage content of Nb is x%.

[0135] This allows shape memory alloys to have a wider phase transformation hysteresis and a higher recoverable strain potential, which is the material basis for obtaining a large porosity.

[0136] The tubing specifications for the large tolerance adaptive assembly joint 100 for space assembly can be from an inner diameter of 5 mm to 30 mm and a wall thickness of less than or equal to 2 mm. This size range is suitable for common space structure connecting rods.

[0137] As a specific embodiment of this application, the large tolerance adaptive assembly joint 100 for space assembly can be manufactured using two processing methods.

[0138] The first processing method is as follows: Select Ni-Ti-Nb ternary alloy tubes that meet the above composition and specifications, and then process the tubes into high-precision components with high-density topological structures through laser cutting technology. Finally, heat-treat the processed components at a temperature of 450°C to 650°C for 5 to 60 minutes to set their memory shape and obtain the required phase transformation characteristics.

[0139] The second processing method is as follows: First, select Ni-Ti-Nb alloy powder with the above composition and a particle size of 15 micrometers to 53 micrometers. Then, directly form a large tolerance adaptive assembly joint 100 with a topological hollow structure for space assembly using laser powder bed fusion additive manufacturing technology. Finally, perform heat treatment at a temperature of 450°C to 650°C for 5 to 60 minutes.

[0140] Exemplarily, when applying the large-tolerance adaptive assembly joint 100 for space assembly, it is necessary to perform mechanical hole expansion on it in a temperature environment below -60°C so that the inner diameter expansion rate reaches 20% to 40%, thereby obtaining an assembly tolerance ability greater than that of traditional shape memory alloy interfaces.

[0141] After hole expansion, the first connecting part 200 and the second connecting part 300 are placed into the mounting hole 110 for assembly in an environment below 20°C. Subsequently, when the temperature rises above 40°C, the large-tolerance adaptive assembly joint 100 for space assembly undergoes a phase change and recovers, radially contracting to hold the connecting part 132 tightly, and maintaining a stable fastening state within a wide temperature range from -50°C to 130°C.

[0142] Due to the large hole expansion rate, there is a large difference between the inner diameter d1 of the mounting hole 110 after low-temperature hole expansion and the inner diameter d2 after free-state heating and recovery. Thus, the first connecting part 200 and the second connecting part 300 with an outer diameter d0 satisfying d2 < d0 < d1 can be reliably connected, thereby being able to adapt to rods with a size deviation of 40% and an assembly alignment deviation within ±15 degrees, solving the problem that traditional interfaces have strict requirements for dimensional accuracy and assembly accuracy.

[0143] Based on the above content, two specific embodiments are provided to describe the manufacturing process of the large-tolerance adaptive assembly joint 100 for space assembly.

[0144] Embodiment 1:

[0145] First, refer to Figure 7 , select a Ni-Ti-Nb ternary alloy tube with a chemical composition of Ni44Ti 47 Nb9. The specifications of this tube are an outer diameter of 21 mm, an inner diameter d of 20 mm, and a wall thickness of 0.5 mm.

[0146] Secondly, design the structure of the large-tolerance adaptive assembly joint 100 for space assembly as a hexagonal topological hollow configuration with a positive Poisson's ratio effect. Use a laser cutting and engraving system to perform high-precision machining on this alloy tube to form the required topological hollow structure.

[0147] Then, perform heat treatment on the large-tolerance adaptive assembly joint 100 for space assembly after laser cutting processing to set its memory shape and obtain the required phase change characteristics. The heat treatment temperature is 650°C, and the treatment duration is 30 minutes.

[0148] Then, refer to Figure 8 , perform a mechanical hole expansion operation on the large-tolerance adaptive assembly joint 100 for space assembly after heat treatment in a low-temperature environment of -80°C. Expand the inner diameter of its mounting hole 110 from the initial 20 mm to 26 mm, and calculate that the hole expansion rate is 30%. Refer to Figure 9 After the hole is enlarged, at an ambient temperature of 10 degrees Celsius, a rod with an outer diameter d0 of 22 mm (as an example of the first connection part 200 and the second connection part 300) is placed into the mounting hole 110 of the large tolerance adaptive assembly joint 100 for spatial assembly for assembly.

[0149] Then see Figure 10 When the temperature of the assembly rises to 55 degrees Celsius, the large-tolerance adaptive assembly joint 100 for spatial assembly undergoes phase transition recovery due to its shape memory effect. The inner diameter of the mounting hole 110 shrinks, thereby radially clamping the rod and forming a reliable mechanical connection. This connection can maintain a stable and tight state over a wide temperature range of -50 degrees Celsius to 130 degrees Celsius.

[0150] Tests have shown that the large tolerance adaptive assembly joint 100 for spatial assembly prepared in this embodiment can accommodate a 30% deviation in rod size and an assembly alignment angle deviation within ±10 degrees.

[0151] Regarding axial behavior, the large tolerance adaptive assembly joint 100 for spatial assembly of positive Poisson's ratio topology in this embodiment shortens from its original height h=30 mm to h1=26 mm after hole enlargement; during the heating and clamping process after assembly, its height elongates from h1=26 mm to h2=29 mm, resulting in an elongation of 3 mm.

[0152] This axial elongation process generates axial thrust during assembly, which helps to automatically align components and eliminate radial clearance, thereby reducing assembly alignment errors. In multi-module on-orbit assembly scenarios, this feature helps to alleviate axial stress concentration caused by temperature differences or uneven load distribution. Therefore, this high-tolerance adaptive assembly joint 100 for space assembly is suitable for precision assembly scenarios with frequent thermal cycling or high coaxiality requirements.

[0153] Implementation Method 2:

[0154] First, select a chemical composition of Ni44Ti. 47 The Nb9 Ni-Ti-Nb ternary alloy tubing has the following specifications: outer diameter 21 mm, inner diameter d 20 mm, and wall thickness 0.5 mm.

[0155] Secondly, the structure of the large-tolerance adaptive assembly joint 100 for spatial assembly is designed as a topologically hollowed-out configuration with a negative Poisson's ratio effect. The alloy tube is processed using a laser cutting and engraving system to form the required negative Poisson's ratio topological structure.

[0156] Next, the processed large-tolerance adaptive assembly joint 100 for spatial assembly is heat-treated to optimize its shape memory performance. The heat treatment temperature is 650 degrees Celsius, and the treatment time is 30 minutes.

[0157] Then, the heat-treated, high-tolerance adaptive assembly joint 100 for space assembly was mechanically enlarged at a low temperature of -80 degrees Celsius. This enlarged the inner diameter of its mounting hole 110 from 20 mm to 25 mm, resulting in an enlargement rate of 25%. After enlargement, a rod with an outer diameter d0 of 22 mm was inserted into the mounting hole 110 of the high-tolerance adaptive assembly joint 100 at an ambient temperature of -80 degrees Celsius.

[0158] Subsequently, when the temperature of the assembly rises to 50 degrees Celsius, the large-tolerance adaptive assembly joint 100 for space assembly undergoes a phase change recovery, and the inner diameter of the mounting hole 110 shrinks, thereby radially clamping the rod. This connection can also remain secure over a wide temperature range of -50 degrees Celsius to 130 degrees Celsius.

[0159] Tests have shown that the large tolerance adaptive assembly joint 100 for spatial assembly prepared in this embodiment can accommodate a 25% deviation in rod size and an assembly alignment angle deviation within ±8 degrees.

[0160] Regarding axial behavior, the large tolerance adaptive assembly joint 100 for negative Poisson's ratio topology spatial assembly in this embodiment elongates from its original height h=30 mm to h1=33 mm after hole enlargement; during the heating and clamping process after assembly, its height shortens from h1=33 mm to h2=31 mm, resulting in a shortening of 2 mm.

[0161] This axial shortening process applies an additional axial clamping force to the members, effectively eliminating any axial clearance that may exist at the connection interface, thereby significantly improving the locking strength, overall stability, and load-bearing capacity of the connection. Therefore, this large-tolerance adaptive assembly joint 100 for space assembly is suitable for long-term service structures subjected to vibration, shock, or high loads.

[0162] This application provides a spacecraft including a large-tolerance adaptive assembly joint 100 for space assembly as described in any of the above embodiments.

[0163] Since the spacecraft includes the large tolerance adaptive assembly joint 100 for space assembly according to any of the above embodiments, the advantages of the spacecraft including the large tolerance adaptive assembly joint 100 for space assembly according to any of the above embodiments can be found in the relevant description above, and will not be repeated here.

[0164] The above technical description is illustrated with reference to the accompanying drawings, which form a part of this application, and which show implementations according to the described embodiments. While these embodiments are described in sufficient detail to enable those skilled in the art to implement them, these embodiments are not limiting; thus, other embodiments can be used, and variations can be made without departing from the scope of the described embodiments.

[0165] Furthermore, terminology is used in the above technical description to provide a thorough understanding of the described embodiments. However, excessive detail is not required to implement the described embodiments. Therefore, the above description of the embodiments is presented for illustrative and descriptive purposes. The embodiments presented in the above description, as well as the examples disclosed according to these embodiments, are provided separately to add context and aid in understanding the described embodiments. The above specification is not intended to be exhaustive or to limit the described embodiments to the precise form of this application. Based on the above teachings, several modifications, selections, and variations are possible. In some cases, well-known processing steps have not been described in detail to avoid unnecessarily affecting the described embodiments.

[0166] This application uses specific embodiments to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

[0167] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A large-tolerance adaptive assembly joint for space assembly, characterized in that, The large tolerance adaptive assembly joint (100) for space assembly has a mounting hole (110), which is at least used to fit on the outside of the first connecting part (200) and the second connecting part (300); The material of the large tolerance adaptive assembly joint (100) for space assembly includes shape memory alloy, and the hole expansion rate of the large tolerance adaptive assembly joint (100) for space assembly is greater than or equal to 20%; the hole diameter of the mounting hole (110) is adjustable, and when the hole diameter of the mounting hole (110) increases, the length of the large tolerance adaptive assembly joint (100) for space assembly increases or decreases.

2. The large tolerance adaptive assembly joint for space assembly according to claim 1, characterized in that, When the diameter of the mounting hole (110) increases, the length of the large tolerance adaptive assembly joint (100) for spatial assembly decreases.

3. The large tolerance adaptive assembly joint for space assembly according to claim 2, characterized in that, The large tolerance adaptive assembly joint (100) for space assembly includes multiple annular structures (120) arranged sequentially along the axial direction. The ring structure (120) includes a plurality of bends (121) arranged in sequence. The bends (121) of two adjacent ring structures (120) are arranged opposite to each other and together form a pre-adjustment space (122). When the diameter of the mounting hole (110) increases, the two opposing bends (121) move closer to each other, the area of ​​the pre-adjustment space (122) decreases, and the circumferential length of the annular structure (120) lengthens.

4. The large tolerance adaptive assembly joint for space assembly according to claim 1, characterized in that, When the diameter of the mounting hole (110) increases, the length of the large tolerance adaptive assembly joint (100) for spatial assembly increases.

5. The large tolerance adaptive assembly joint for space assembly according to claim 4, characterized in that, The large tolerance adaptive assembly joint (100) for space assembly includes multiple connecting strips (130) arranged sequentially along the circumference. The connecting strip (130) extends along the axial direction of the mounting hole (110); when the diameter of the mounting hole (110) increases, the distance between at least two connecting strips (130) increases, and the length of the connecting strip (130) increases.

6. The large tolerance adaptive assembly joint for space assembly according to claim 5, characterized in that, The connecting strip (130) includes a plurality of adjusting parts (131) arranged sequentially along the axial direction of the mounting hole (110); The adjustment part (131) is provided to protrude circumferentially along the mounting hole (110); on the circumferential direction of the mounting hole (110), one side of the adjustment part (131) is spaced apart from the adjacent connecting strip (130), and the other side of the adjustment part (131) is connected to the adjacent connecting strip (130).

7. The large tolerance adaptive assembly joint for space assembly according to claim 6, characterized in that, When the diameter of the mounting hole (110) increases, the length of the adjusting part (131) lengthens, and the distance between the protruding side of the adjusting part (131) and the adjacent connecting strip (130) increases.

8. The large tolerance adaptive assembly joint for space assembly according to claim 7, characterized in that, Between two adjacent connecting strips (130), the side of the protruding adjustment part (131) in one connecting strip (130) is spaced apart from the side of the protruding adjustment part (131) in the other connecting strip (130); Between two adjacent connecting strips (130), one side of the recessed adjustment portion (131) in one connecting strip (130) is connected to the other side of the recessed adjustment portion (131) in the other connecting strip (130) by a connecting portion (132) extending circumferentially along the mounting hole (110).

9. The large tolerance adaptive assembly joint for space assembly according to claim 8, characterized in that, The length of the connecting part (132) is greater than the minimum distance between two adjacent connecting strips (130).

10. A spacecraft, characterized in that, Includes the large tolerance adaptive assembly joint (100) for space assembly as described in any one of claims 1-9.

Images