A high wear resistance pull rivet nut

Abstract

The utility model discloses a kind of high wear resistance pull rivet nuts, it includes nut main body, embedded reinforcing ring, elastic support piece and surface hardening layer.Nut main body is cylindrical structure, outer wall is equipped with recess, top embedded hard alloy reinforcing ring, bottom is equipped with elastic support piece, outer surface covers titanium nitride coating.This application can significantly improve the anti-wear ability of nut in repeated disassembly, stress is dispersed by recess, reinforcing ring improves hardness, elastic support piece absorbs impact energy, and surface hardening layer is used to reduce friction coefficient, to extend service life and enhance connection stability, suitable for high-frequency maintenance and harsh working condition scene.

Description

Technical Field

[0001] This utility model relates to the field of rivet nut technology, specifically to a rivet nut with high wear resistance. Background Technology

[0002] With the widespread application of rivet nuts in automobiles, electronic equipment, and building hardware, their performance requirements are increasingly stringent, especially the demand for wear resistance under high-intensity operating environments. However, current rivet nut products on the market still have some shortcomings in practical applications, particularly in their susceptibility to wear, deformation, and even failure during long-term stress or frequent disassembly and assembly, affecting the reliability and service life of the connection.

[0003] In the prior art, a rivet nut, by setting a stop part, a tubular part, an elastic deformation part, and a threaded connection body, enables riveting operations to be completed without special tools, and relies on elastic deformation for easy disassembly and replacement. Although this structure simplifies the installation process, when repeatedly disassembled or used in areas of high stress concentration, the elastic deformation part is prone to permanent deformation due to material fatigue, resulting in decreased connection strength and insufficient wear resistance, making it difficult to meet the usage requirements in high-frequency maintenance scenarios.

[0004] A method for manufacturing an elastic rivet anti-loosening nut involves creating a tension structure by cutting a groove at the tail end of the nut, which then self-locks after tightening to achieve an anti-loosening effect. While this design improves the stability of the connection, the grooved area is structurally weak and prone to localized wear or even breakage under heavy friction or vibration loads, thus reducing overall durability. It performs poorly, especially in high-temperature and corrosive environments, limiting its applicability in harsh working conditions.

[0005] In summary, existing rivet nuts still have certain limitations in terms of wear resistance and structural stability, making it difficult to fully meet the modern industrial demand for high-strength, long-life fasteners. Utility Model Content

[0006] To address the shortcomings of the existing technology, this utility model proposes a rivet nut with high wear resistance.

[0007] To achieve the above-mentioned technical effects, the present invention adopts the following solution:

[0008] A highly wear-resistant rivet nut includes a nut body, an embedded reinforcing ring, an elastic support plate, and a surface hardening layer. The nut body has a cylindrical structure with a through threaded hole inside. A stop portion is provided on the outer bottom of the nut body, which is an annular protrusion integrally formed with the nut body. Several grooves are evenly formed circumferentially on the outer wall of the middle part of the nut body. The embedded reinforcing ring is nested inside the top of the nut body. The elastic support plate is provided on the inner bottom of the nut body, and the outer diameter of the elastic support plate matches and fits tightly with the inner diameter of the nut body. The surface hardening layer covers the outer wall of the nut body and the outer surface of the stop portion.

[0009] A further preferred embodiment: the number of grooves is 6 to 8 and they are evenly distributed along the outer wall of the nut body. The radius of the arc-shaped cross section of the groove is 1 / 10 to 1 / 8 of the outer diameter of the nut body. The inner wall of the groove is smooth and transitions smoothly with the outer wall of the nut body.

[0010] A further preferred embodiment: the inner wall of the embedded reinforcing ring is provided with several tiny serrated protrusions.

[0011] A further preferred embodiment: the elastic support sheet is a multi-layered corrugated metal sheet with 3 to 5 layers.

[0012] A further preferred embodiment: A stepped groove is provided on the inner top of the nut body, and an embedded reinforcing ring is embedded in the stepped groove and fixed by an interference fit.

[0013] A further preferred embodiment: the upper surface of the stop portion is provided with a plurality of radial grooves.

[0014] Compared with existing technologies, the beneficial effects are:

[0015] 1. By setting grooves on the outer wall of the nut body and embedding a hard alloy reinforcing ring on the top, the wear resistance of the nut body during repeated disassembly and assembly is significantly improved, solving the problem that existing rivet nuts are prone to permanent deformation due to material fatigue under high-frequency maintenance scenarios; 2. The elastic support plate adopts a multi-layer corrugated metal sheet stacked structure. The corrugated design realizes stress dispersion and energy absorption functions, effectively extending the service life of the nut under long-term stress conditions; 3. The surface hardening layer adopts a titanium nitride coating and forms a dense crystal structure through high-temperature treatment. While improving the surface hardness of the nut, it reduces the coefficient of friction, significantly improving the durability and reliability of the nut under harsh working conditions. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0017] Reference numerals: 1. Nut body; 2. Embedded reinforcing ring; 3. Elastic support plate; 5. Stop; 6. Groove; 7. Serrated protrusion; 8. Wavy metal plate; 11. Radial groove; 12. Annular groove; 13. Stepped groove. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0019] A high-wear-resistant rivet nut includes a nut body 1, an embedded reinforcing ring 2, an elastic support plate 3, and a surface-hardened layer. The nut body 1 has a cylindrical structure with a through-threaded hole inside for mating with a bolt to achieve a connection function. A stop portion 5 is provided on the outer bottom of the nut body 1. The stop portion 5 is annularly protruding and integrally formed with the nut body 1, used to limit the insertion depth of the nut body 1 during installation and enhance connection stability.

[0020] The outer wall of the nut body 1 has a plurality of grooves 6 evenly distributed circumferentially along its central part. There are 6 to 8 grooves 6, evenly distributed along the outer wall of the nut body 1. The radius of the arc-shaped cross-section of the groove 6 is 1 / 10 to 1 / 8 of the outer diameter of the nut body 1, and the depth of the groove 6 is 1 / 8 to 1 / 6 of the outer diameter of the nut body 1. The inner wall of the groove 6 is smooth and smoothly transitions with the outer wall of the nut body 1, effectively dispersing external stress concentration and preventing deformation or wear caused by excessive local stress. Simultaneously, the presence of the grooves 6 increases the friction between the nut body 1 and the connected parts, thereby improving connection stability. The upper surface of the stop portion 5 has a plurality of radial grooves 11. The depth of the radial grooves 11 is 0.5 mm to 1 mm, the included angle between adjacent radial grooves 11 is 15° to 30°, and the width of the radial grooves 11 is 1 mm to 2 mm. The radial grooves 11 can expel excess air during installation, avoiding installation resistance caused by air pressure, while increasing the friction between the stop 5 and the connected parts.

[0021] An embedded reinforcing ring 2 is nested inside the top of the nut body 1. The embedded reinforcing ring 2 is made of hard alloy material with a thickness of 0.5 mm to 1.2 mm. A stepped groove 13 is formed on the inner side of the top of the nut body 1. The depth of the stepped groove 13 is 1 mm to 2 mm, and the width of the stepped groove 13 is 2 mm to 3 mm. The embedded reinforcing ring 2 is embedded in the stepped groove 13 and fixed by interference fit. The inner wall of the embedded reinforcing ring 2 has several tiny serrated protrusions 7. The height of the serrated protrusions 7 is 0.1 mm to 0.3 mm, the spacing between adjacent serrated protrusions 7 is 0.5 mm to 1 mm, and the inclination angle of the serrated protrusions 7 is 30° to 45°. The serrated protrusions 7 form a tight connection with the inner wall of the nut body 1 through mechanical engagement, effectively preventing the embedded reinforcing ring 2 from sliding or falling off during repeated disassembly and assembly, and significantly improving the wear resistance of the top of the nut body 1.

[0022] An elastic support plate 3 is located on the inner bottom of the nut body 1. The elastic support plate 3 is composed of multiple layers of corrugated metal sheets 8, which are fixed together by spot welding. The elastic support plate 3 has 3 to 5 layers of corrugated metal sheets 8, with each layer having a crest height of 0.8 mm to 1.5 mm, a trough depth of 0.5 mm to 1 mm, and a wavelength of 5 mm to 8 mm. A circular through-hole is located at the center of the elastic support plate 3, with a diameter of 1 / 3 to 1 / 2 of the inner diameter of the nut body 1. The outer edge of the elastic support plate 3 has several outwardly extending lugs, with 4 to 6 lugs evenly distributed circumferentially. The design of the circular through-hole and lugs reduces overall weight while ensuring structural strength, and the tight fit between the lugs and the inner wall of the nut body 1 further enhances connection stability.

[0023] A surface-hardened layer covers the outer wall of the nut body 1 and the outer surface of the stop portion 5. The surface-hardened layer is composed of a titanium nitride coating with a thickness of 20 μm to 40 μm. After high-temperature treatment, the titanium nitride coating forms a dense crystalline structure with crystal grains having a diameter of 0.5 μm to 1 μm and a surface roughness Ra value of 0.2 μm to 0.5 μm. The surface-hardened layer improves the hardness and wear resistance of the outer wall of the nut body 1 and the stop portion 5, while the lower surface roughness reduces the coefficient of friction when in contact with other components.

[0024] An annular groove 12 is provided on the inner bottom side of the nut body 1. The depth of the annular groove 12 is 1mm to 1.5mm, and the width of the annular groove 12 is 2mm to 3mm. The elastic support plate 3 is embedded in the annular groove 12 and fits tightly against the inner wall of the nut body 1. The design of the annular groove 12 ensures that the elastic support plate 3 can absorb impact energy through the elastic deformation of the corrugated metal plate 8 when subjected to axial load. The corrugated structure design allows the metal plates 8 to move relative to each other within a certain range, thereby alleviating stress concentration and extending service life.

[0025] The working principle is as follows:

[0026] When the rivet nut is subjected to external stress during use, the groove 6 on the outer wall of the nut body 1 effectively disperses stress concentration, preventing deformation or wear caused by excessive local stress. Simultaneously, the groove 6 increases the friction between the nut body 1 and the connected parts, improving connection stability. The embedded reinforcing ring 2 forms a mechanical engagement with the inner wall of the nut body 1 through the serrated protrusion 7, effectively preventing slippage or detachment during repeated assembly and disassembly. The use of hard alloy material significantly enhances the wear resistance of the top of the nut body 1. The elastic support plate 3 absorbs impact energy through the elastic deformation of the corrugated metal plate 8 when subjected to axial loads. The corrugated structure design allows relative movement between the metal plates 8 within a certain range, thereby alleviating stress concentration and extending service life. The titanium nitride coating of the surface hardening layer forms a dense crystalline structure through high-temperature treatment, improving the hardness and wear resistance of the outer wall of the nut body 1 and the stop portion 5. At the same time, the lower surface roughness reduces the coefficient of friction when in contact with other components. The radial grooves 11 of the stop part 5 can expel excess air during installation, avoiding installation resistance caused by air pressure. At the same time, the presence of the grooves also increases the friction between the stop part 5 and the connected part.

[0027] In the description of this utility model, it should be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this utility model and simplify the description, and are not intended to indicate or imply that the device or component 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 this utility model.

[0028] Furthermore, 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0029] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

Claims

1. A high wear-resistant rivet nut, characterized in that: The nut body (1) is cylindrical and has a through threaded hole inside. A stop (5) is provided on the outer bottom of the nut body (1). The stop (5) is annularly protruding and integrally formed with the nut body (1). Several grooves (6) are evenly provided on the outer wall of the middle part of the nut body (1) along the circumference. An embedded reinforcing ring (2) is nested on the inner top of the nut body (1). An elastic support plate (3) is provided on the inner bottom of the nut body (1). The outer wall of the nut body (1) and the outer surface of the stop (5) are covered with a surface hardening layer.

2. The high wear-resistant rivet nut according to claim 1, characterized in that: The number of grooves (6) is 6 to 8 and they are evenly distributed along the outer wall of the nut body (1). The radius of the arc cross section of the groove (6) is 1 / 10 to 1 / 8 of the outer diameter of the nut body (1). The inner wall of the groove (6) is smooth and smoothly transitions with the outer wall of the nut body (1).

3. The high wear-resistant rivet nut according to claim 1, characterized in that: The inner wall of the embedded reinforcing ring (2) has several serrated protrusions (7).

4. The high wear-resistant rivet nut according to claim 1, characterized in that: The elastic support sheet (3) is a corrugated metal sheet (8).

5. A high wear-resistant rivet nut according to claim 1, characterized in that: The nut body (1) has a stepped groove (13) on the inner side of its top, and the embedded reinforcing ring (2) is embedded in the stepped groove (13) and fixed by interference fit.

6. A high wear-resistant rivet nut according to claim 1, characterized in that: The upper surface of the stop part (5) is provided with a number of radial grooves (11).

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