Double-layer rivet nut

Abstract

The utility model relates to the technical field of rivet nuts, in particular to a double-layer rivet nut which comprises a cylindrical body, a through inner hole is formed in the cylindrical body in the axial direction, a flange portion is arranged at the end, close to an opening of the inner hole, of the cylindrical body in a sleeved mode, a step portion b is arranged on the outer wall, close to the flange portion, of the cylindrical body, and a step portion a is arranged on the outer wall of the flange portion. The center of the flange part is coaxial with the inner hole, uniform stress is ensured through the coaxial design of the flange part and the inner hole, the step part a and the step part b are distributed in a step shape, the outer diameter difference is achieved, the axial height ratio is 0.8: 1, layered limiting and accurate stress can be achieved, and drawing force and torque are effectively dispersed. The deformation part, close to the step part b, of the cylindrical main body is tightly attached to a plate during rivet pulling, the connection sealing performance and stability are enhanced, the chamfer at the end away from the flange part reduces assembly friction and eliminates stress hidden dangers, and due to the design of internal threads and differentiated wall thicknesses of the inner wall of the inner hole, the threaded connection reliability is guaranteed, and the deformation effect is optimized.

Description

Technical Field

[0001] This utility model relates to the field of rivet nut technology, specifically a double-layer rivet nut. Background Technology

[0002] A rivet nut is a non-welded fastener that resembles a regular nut in appearance but has a unique installation method: riveting. To install it, the rivet nut head is inserted into a pre-drilled hole in the part being connected. A special tool is then used to tighten the rivet nut, bringing the rivet head into contact with the part, thus completing the connection. Rivet nuts provide robust threaded connections in thin plates or lightweight materials, are easy to install, and can be repeatedly disassembled. They are widely used in aerospace, automotive manufacturing, and electronics industries, such as for connections in aircraft interiors and car seats, effectively ensuring connection strength and stability.

[0003] Rivet nuts can quickly complete connections and effectively save time and costs, but they still have certain problems: 1) Uneven force during riveting can easily lead to local stress concentration, resulting in insufficient connection strength and shortened service life; 2) Conventional rivet nuts have a fixed structure and cannot be adapted to special installation spaces or complex shapes of plates; 3) The sealing and stability of the connection between traditional rivet nuts and the mounting plate are not good. Therefore, in view of the above situation, there is an urgent need to develop double-layer rivet nuts to overcome the shortcomings in current practical applications and meet current needs. Utility Model Content

[0004] The purpose of this invention is to provide a double-layer rivet nut to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a double-layer rivet nut, comprising a cylindrical body, the cylindrical body having a through inner hole along the axial direction, a flange portion fitted at one end of the cylindrical body adjacent to the opening of the inner hole, a step portion b on the outer wall of the cylindrical body adjacent to the flange portion, and a step portion a on the outer wall of the flange portion.

[0006] In practical use, by fitting a flange onto the end of the cylindrical body near the inner hole opening, and by setting a step b on the outer wall of the flange near the cylindrical body and a step a on the outer wall of the flange, the double-step structure can effectively disperse the stress during riveting installation and use, improve the compatibility and clamping stability between the nut and the mounting plate, optimize the axial and radial load-bearing capacity, reduce the risk of loosening, and at the same time, the double steps assist in pre-positioning and pre-compression during assembly, improve assembly convenience and overall stability, adapt to complex working conditions, expand application scenarios, and achieve multi-dimensional performance optimization in installation, stress, and function through structural collaboration.

[0007] The center of the flange is coaxial with the inner hole, and the stepped parts a and b are distributed in a stepped manner.

[0008] In practical use, the center of the flange is coaxial with the inner hole, which ensures that the rivet nut is subjected to uniform force and avoids local stress concentration caused by eccentricity, which would affect the connection strength and service life. The stepped parts a and b are distributed in a stepped shape. On the one hand, the double-step structure can be adapted and positioned to different parts of the mounting plate during riveting assembly, accurately guiding the installation process and improving assembly efficiency and accuracy. On the other hand, the double steps can distribute the load in the riveting and use stages in stages, effectively optimizing the stress transmission path, enhancing the clamping stability, pull-out resistance and torsional resistance between the nut and the plate, adapting to complex working conditions, expanding application scenarios, and achieving multi-dimensional improvements in assembly convenience, mechanical performance and working condition adaptability through the synergy of coaxial design and stepped distribution.

[0009] Preferably, the end of the cylindrical body adjacent to the step portion b is the deformable portion.

[0010] Preferably, the edge of the cylindrical body away from the flange is chamfered.

[0011] Preferably, the inner wall of the end of the inner hole away from the flange is provided with an internal thread, and the thickness of the inner wall of the cylindrical body at the internal thread is greater than the thickness of the inner wall of the deformed part.

[0012] In practical use, the end of the cylindrical body adjacent to step b is set as a deformation part, which can tightly fit the installation plate through its own deformation during the riveting process, enhancing the connection sealing and stability. The edge of the cylindrical body away from the flange is chamfered, which can reduce the frictional resistance during assembly, facilitate insertion into the installation hole, eliminate the risk of stress concentration, and improve the structural durability. The inner wall of the inner hole away from the flange is threaded, which can realize the threaded connection with bolts and other connecting parts, expanding the application scenarios. Moreover, the thickness of the inner wall of the cylindrical body at the internal thread is greater than the thickness of the inner wall of the deformation part, which can ensure the strength and wear resistance of the internal thread, ensure the reliability of the threaded connection, and make the deformation part more easily deformed during riveting. This achieves a reasonable division of structural functions and performance optimization. Through the collaborative design of each component, the installation convenience, connection stability, and application flexibility of the rivet nut are significantly improved.

[0013] Preferably, the outer diameter of step a is greater than the outer diameter of step b, and the axial height ratio of step a to step b is 0.8:1.

[0014] In practical use, the outer diameter of step a is larger than that of step b, forming a stepped structure. This allows for close contact with different positions on the mounting plate during riveting. The difference in outer diameter enables layered positioning and force distribution, effectively dispersing pull-out force and torque, and improving the connection strength and stability between the nut and the plate. Furthermore, the axial height ratio of step a to step b is set to 0.8:1. This precise ratio allows the double steps to adapt to the plate thickness while optimizing the overall force distribution of the nut. This ensures the stability of the contact between the flange and the plate surface, while also providing reasonable support and constraint during riveting deformation. This further enhances the nut's resistance to loosening and fatigue, thereby improving the product's applicability and service life under various working conditions.

[0015] Preferably, the outer periphery of the flange is circular or an irregularly shaped adaptable structure.

[0016] In practical use, the outer periphery of the flange is set as a circular or irregularly shaped adaptive structure. When a circular profile is used, its symmetrical structure and uniform stress distribution can be utilized to form a stable and balanced contact surface with the mounting plate after riveting, effectively dispersing axial and radial loads and reducing local stress concentration. The irregularly shaped adaptive structure can be customized according to the needs of different application scenarios, accurately matching the special shape of the installation part to achieve a tight fit and stable connection. This not only meets the requirements of standardized assembly but also expands the applicability of nuts in irregular installation environments, greatly improving the product's versatility and market application range.

[0017] Preferably, the outer periphery of the step portion a is a circular or irregularly shaped fitting structure.

[0018] Preferably, the outer periphery of the step portion b is a circular or irregularly shaped fitting structure.

[0019] In practical use, the outer contours of step a and step b are set as circular or irregularly shaped adaptive structures. When a circular contour is used, its regular shape and uniform force characteristics enable it to form balanced contact and compression with the mounting hole wall during riveting, effectively dispersing the pull-out force and ensuring the stability of the nut after installation. When set as an irregularly shaped adaptive structure, it can be customized according to different installation scenarios and specific mating requirements, accurately fitting special-shaped mounting holes or mating parts to achieve a tighter and more secure connection. This not only improves the applicability of the nut in standard installation environments but also breaks through the limitations of conventional circular structures, expanding the application range in complex and non-standard installation conditions and significantly enhancing the product's versatility and flexibility.

[0020] Compared with the prior art, the present invention provides a double-layer rivet nut, which has the following beneficial effects:

[0021] The coaxial design of the flange and inner bore ensures uniform stress distribution. The stepped sections a and b are distributed in a stepped manner with different outer diameters and an axial height ratio of 0.8:1, which can limit the force in layers and ensure precise stress distribution, effectively dispersing pull-out force and torque. The deformable part of the cylindrical body adjacent to the stepped section b fits tightly against the plate during riveting, enhancing the connection sealing and stability. The chamfer on the end away from the flange reduces assembly friction and eliminates stress risks. The internal thread and differentiated wall thickness design of the inner bore ensure the reliability of the threaded connection and optimize the deformation effect. At the same time, both the flange and stepped section a can be selected as circular or irregularly shaped adaptable structures. The circular shape ensures stable stress distribution under standard installation, while the irregular shape meets the customized connection requirements of special working conditions. The collaborative innovation of each structure comprehensively improves the ease of installation, connection strength, fatigue resistance and application flexibility. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the front structure of this utility model;

[0024] Figure 2 This is a side view of the present invention.

[0025] Figure 3 This is one of the partial cross-sectional schematic diagrams of the cylindrical main body of this utility model;

[0026] Figure 4 This is the second partial cross-sectional schematic diagram of the cylindrical main body of this utility model.

[0027] In the diagram: 10, cylindrical body; 110, deformable part; 120, chamfer; 130, inner hole; 140, internal thread; 20, flange part; 30, step part a; 40, step part b. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0030] Example:

[0031] Please see Figures 1-4 This utility model provides a technical solution: a double-layer rivet nut, including a cylindrical body 10, the cylindrical body 10 having a through inner hole 130 along the axial direction, a flange 20 being sleeved at one end of the cylindrical body 10 near the opening of the inner hole 130, a stepped portion b40 being provided on the outer wall of the cylindrical body 10 near the flange 20, and a stepped portion a30 being provided on the outer wall of the flange 20.

[0032] In practical use, by fitting a flange 20 onto the end of the column body 10 near the opening of the inner hole 130, and by providing a step b40 on the outer wall of the column body 10 near the flange 20 and a step a30 on the outer wall of the flange 20, the double-step structure can effectively disperse the stress during riveting installation and use, improve the compatibility and clamping stability between the nut and the mounting plate, optimize the axial and radial load-bearing capacity, reduce the risk of loosening, and at the same time, the double steps assist in pre-positioning and pre-pressing during assembly, improve assembly convenience and overall stability, adapt to complex working conditions, expand application scenarios, and achieve multi-dimensional performance optimization in installation, stress, and function through structural collaboration.

[0033] The center of flange 20 is coaxial with the inner hole 130, and the stepped parts a30 and b40 are distributed in a stepped manner.

[0034] In practical use, the center of flange 20 is coaxial with the inner hole 130, which ensures that the rivet nut is subjected to uniform force and avoids local stress concentration caused by eccentricity, which affects the connection strength and service life. The stepped parts a30 and b40 are distributed in a stepped shape. On the one hand, the double-step structure can be adapted and positioned to different parts of the mounting plate during riveting assembly, accurately guiding the installation process and improving assembly efficiency and accuracy. On the other hand, the double steps can distribute the load in the riveting and use stages in stages, effectively optimizing the stress transmission path, enhancing the clamping stability, pull-out resistance and torsional resistance between the nut and the plate, adapting to complex working conditions, expanding application scenarios, and achieving multi-dimensional improvement in assembly convenience, mechanical performance and working condition adaptability through the synergy of coaxial design and stepped distribution structure.

[0035] Preferably, the end of the columnar body 10 adjacent to the step portion b40 is the deformable portion 110.

[0036] Preferably, the edge of the cylindrical body 10 away from the flange 20 is chamfered 120.

[0037] Preferably, the inner wall of the inner hole 130 away from the flange 20 is provided with an internal thread 140, and the inner wall thickness of the cylindrical body 10 at the internal thread 140 is greater than the inner wall thickness of the deformed part 110.

[0038] In practical use, the end of the columnar body 10 adjacent to the step b40 is set as the deformation part 110, which can tightly fit the installation plate through its own deformation during the riveting process, enhancing the connection sealing and stability. The edge of the columnar body 10 away from the flange 20 is chamfered 120, which can reduce the frictional resistance during assembly, facilitate insertion into the installation hole, eliminate the risk of stress concentration, and improve the structural durability. The inner wall of the inner hole 130 away from the flange 20 is provided with an internal thread 140, which can realize the threaded connection with bolts and other connecting parts, expanding the application scenarios. Moreover, the inner wall thickness of the columnar body 10 at the internal thread 140 is greater than the inner wall thickness of the deformation part 110, which can ensure the strength and wear resistance of the internal thread 140, ensure the reliability of the threaded connection, and make the deformation part 110 more easily deformed during riveting. This achieves a reasonable division of structural functions and performance optimization. Through the collaborative design of each component, the installation convenience, connection stability, and application flexibility of the rivet nut are significantly improved.

[0039] Preferably, the outer diameter of step a30 is greater than the outer diameter of step b40, and the axial height ratio of step a30 to step b40 is 0.8:1.

[0040] In practical use, the outer diameter of step a30 is larger than that of step b40, forming a stepped structure. This allows for close contact with different positions on the mounting plate during riveting. The difference in outer diameter enables layered positioning and force distribution, effectively dispersing pull-out force and torque, and improving the connection strength and stability between the nut and the plate. Furthermore, the axial height ratio of step a30 to step b40 is set to 0.8:1. This precise ratio allows the double steps to adapt to the plate thickness while optimizing the overall force distribution of the nut. This ensures the stability of the contact between flange 20 and the plate surface, while also providing reasonable support and constraint for step b40 during riveting deformation. This further enhances the nut's resistance to loosening and fatigue, thereby improving the product's applicability and service life under various working conditions.

[0041] Preferably, the outer periphery of the flange portion 20 is circular or an irregularly shaped adaptable structure.

[0042] In practical use, the outer periphery of the flange 20 is set as a circular or irregularly shaped adaptable structure. When a circular profile is used, its symmetrical structure and uniform stress distribution can be utilized to form a stable and balanced contact force surface with the mounting plate after riveting, effectively dispersing axial and radial loads and reducing local stress concentration. The irregularly shaped adaptable structure can be customized according to the needs of different application scenarios, such as special installation spaces and complex-shaped plates. It can accurately match the special shape of the installation part, achieve a tight fit and a stable connection, meet the requirements of standardized assembly, and expand the applicability of nuts in irregular installation environments, greatly improving the versatility of the product and the scope of market application.

[0043] Preferably, the outer periphery of the step portion a30 is a circular or irregularly shaped fitting structure.

[0044] Preferably, the outer periphery of the step portion b40 is a circular or irregularly shaped fitting structure.

[0045] In practical use, the outer contours of step a30 and step b40 are set as circular or irregularly shaped adaptive structures. When a circular contour is used, its regular shape and uniform force characteristics enable it to form balanced contact and compression with the mounting hole wall during riveting, effectively dispersing the pull-out force and ensuring the stability of the nut after installation. When set as an irregularly shaped adaptive structure, it can be customized according to different installation scenarios and specific mating requirements, accurately fitting special-shaped mounting holes or mating parts to achieve a tighter and more secure connection. This not only improves the applicability of the nut in standard installation environments but also breaks through the limitations of conventional circular structures, expanding the application range in complex and non-standard installation conditions and significantly enhancing the product's versatility and flexibility.

[0046] Working principle: When the double-layer rivet nut is working, the end with the chamfer 120 is first inserted into the corresponding hole of the mounting plate. The chamfer 120 of the cylindrical body 10 guides it to be inserted smoothly. The rivet tool acts on the end of the cylindrical body 10 away from the flange 20 and applies a pulling force to the deformable part 110. After being subjected to force, the deformable part 110 undergoes plastic deformation, expands outward and fits tightly against the hole wall of the mounting plate to form initial fixation. Meanwhile, step b40 and step a30, with their stepped distribution and differences in outer diameter and height, make close contact with different parts of the plate, limiting and dispersing the pull-out force and torque in layers. The flange 20 and the inner hole 130 are coaxial, ensuring uniform force distribution and avoiding local stress concentration caused by eccentricity. When it is necessary to connect with other components, the internal thread 140 of the inner hole 103 can be matched with standard parts such as bolts to achieve secondary connection and fixation. The circular or irregularly shaped adaptable structure of the flange 20 and step a30 can further optimize the contact and force distribution according to the installation environment and the shape of the plate, ultimately achieving a stable, reliable connection effect that is adaptable to various working conditions.

[0047] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, 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, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A double-layer rivet nut, characterized in that: The system includes a cylindrical body (10), which has a through inner hole (130) along the axial direction. A flange (20) is fitted onto one end of the cylindrical body (10) near the opening of the inner hole (130). A step b (40) is provided on the outer wall of the cylindrical body (10) near the flange (20), and a step a (30) is provided on the outer wall of the flange (20). The center of the flange (20) is coaxial with the inner hole (130), and the stepped part a (30) and the stepped part b (40) are distributed in a stepped manner.

2. The double-layer rivet nut according to claim 1, characterized in that: The cylindrical body (10) has a deformable part (110) at one end adjacent to the step part b (40).

3. The double-layer rivet nut according to claim 1, characterized in that: The cylindrical body (10) has a chamfer (120) at one end edge away from the flange (20).

4. The double-layer rivet nut according to claim 1, characterized in that: The inner wall of the inner hole (130) away from the flange (20) is provided with an internal thread (140), and the inner wall thickness of the cylindrical body (10) at the internal thread (140) is greater than the inner wall thickness of the deformed part (110).

5. The double-layer rivet nut according to claim 1, characterized in that: The outer diameter of step a (30) is greater than the outer diameter of step b (40), and the axial height ratio of step a (30) to step b (40) is 0.8:

1.

6. The double-layer rivet nut according to claim 1, characterized in that: The outer periphery of the flange (20) is circular or irregularly shaped.

7. The double-layer rivet nut according to claim 1, characterized in that: The outer periphery of the stepped part a (30) is a circular or irregularly shaped adaptive structure.

8. The double-layer rivet nut according to claim 1, characterized in that: The outer periphery of the stepped portion b (40) is a circular or irregularly shaped adaptive structure.

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