Self-clinching threaded fastener

Abstract

This utility model discloses a self-piercing press-fit nut, including a nut body with an inner hole. One end of the nut body extends a punched portion and an engaging portion fixedly connected thereto. The engaging portion is located outside the punched portion. The outer diameter of the punched portion increases from the end facing the nut body to the end away from the nut body, while the inner diameter of the engaging portion decreases from the end facing the nut body to the end away from the nut body. A first annular surface is provided on the outer side of the punched portion, and a second annular surface is provided on the inner side of the engaging portion. An annular groove is provided between the first and second annular surfaces and the nut body. The punched portion at the bottom of the nut body of this press-fit nut allows for direct drilling of an installation hole in the workpiece during installation, achieving a self-piercing punching effect on the workpiece. This eliminates the need to pre-drill an installation hole in the workpiece, saving a step in the workpiece drilling process and greatly improving the installation efficiency of the press-fit nut.

Description

Technical Field

[0001] This utility model relates to a self-piercing press-fit nut, belonging to the field of fastener technology. Background Technology

[0002] Press-fit nuts are a type of nut used on thin plates or sheet metal, and are widely used in the assembly of electromechanical and light industrial products such as automobiles, aviation, railways, refrigeration, elevators, switches, instruments, furniture, and decoration.

[0003] When installing existing press-fit nuts on workpieces, it is necessary to pre-drill mounting holes in the workpiece, which adds an extra step of drilling holes in the workpiece and reduces the installation efficiency of press-fit nuts. Utility Model Content

[0004] To address the aforementioned issues, this utility model provides a self-piercing press-fit nut. The punched portion at the bottom of the nut body allows for direct drilling of an installation hole in the workpiece during installation, achieving a self-piercing punching effect on the workpiece. This eliminates the need to pre-drill an installation hole in the workpiece, saving a step of drilling the workpiece and significantly improving the installation efficiency of the press-fit nut.

[0005] The purpose of this utility model is to provide a self-piercing press-fit nut, including a nut body with an inner hole. One end of the nut body extends with a punched portion and an engaging portion fixedly connected thereto. The engaging portion is located outside the punched portion. The outer diameter of the punched portion increases from the end facing the nut body to the end away from the nut body. The inner diameter of the engaging portion decreases from the end facing the nut body to the end away from the nut body. A first annular surface is provided on the outer side of the punched portion, and a second annular surface is provided on the inner side of the engaging portion. An annular groove is provided between the first annular surface, the second annular surface, and the nut body.

[0006] In one embodiment of this utility model, a plurality of teeth are fixedly connected circumferentially at one end of the nut body facing the annular groove, one end of the teeth extending to the first annular surface and the other end extending to the second annular surface.

[0007] In one embodiment of this utility model, the punched portion is fixedly connected to the middle of one end of the nut body, and the inner hole penetrates the nut body and the punched portion.

[0008] In one embodiment of this utility model, the engaging part is fixedly connected to the edge of one end of the nut body.

[0009] In one embodiment of this utility model, the height of the punching portion is higher than the height of the meshing portion.

[0010] In one embodiment of this utility model, the radial cross-sections of the nut body, the punched portion, and the engaging portion are all annular, the minimum inner diameter of the punched portion is equal to the diameter of the inner hole of the nut body, and the maximum outer diameter of the engaging portion is equal to the outer diameter of the nut body.

[0011] In one embodiment of this utility model, the nut body, the punched portion, and the engaging portion are coaxial.

[0012] In one embodiment of this utility model, the nut body and the punched part, as well as the nut body and the engaging part, are all integral structures.

[0013] In one embodiment of this utility model, the end of the nut body away from the annular groove is provided with an inner chamfer, and the inner chamfer extends to the inner hole.

[0014] In one embodiment of this utility model, the inner hole is provided with an internal thread.

[0015] Beneficial effects

[0016] 1. When the press-fit nut provided by this utility model is fixed to the workpiece, the punched portion at the bottom of the nut body can directly drill a mounting hole in the workpiece during the installation process, realizing the function of self-piercing the workpiece. This eliminates the need to pre-drill a mounting hole in the workpiece, saving a step of drilling the workpiece and greatly improving the installation efficiency of the press-fit nut. Specifically, during the fixing process, the punched portion fully contacts the workpiece and is subjected to external force. Under pressure, the end of the punched portion directly drills a mounting hole in the workpiece. As the punched portion continues to press into the workpiece under pressure, plastic deformation occurs around the drilled mounting hole, and the deformed material is squeezed into the annular groove.

[0017] 2. Because the outer diameter of the punched portion increases from the end facing the nut body to the end away from the nut body, and the inner diameter of the meshing portion decreases from the end facing the nut body to the end away from the nut body, the first annular surface is an outwardly expanding annular inclined surface, and the second annular surface is an inwardly contracting annular inclined surface. This allows the deformable part to be tightly fixed in the annular groove between the first and second annular surfaces and the nut body. The deformable part in the annular groove forms a locking ring, which firmly fixes the rivet nut to the workpiece, improving the connection strength between the nut and the workpiece, preventing wobbling, and effectively preventing the rivet nut from falling off the workpiece. Simultaneously, because the end of the nut body facing the annular groove is circumferentially connected with several teeth, the punched portion, during the pressing process into the workpiece, drives the teeth to press in as well. The pressure forces the deformable part in the annular groove into the spaces between the teeth of the rivet nut, resulting in a good locking effect. This makes it difficult for the rivet nut and the workpiece to rotate relative to each other, providing strong anti-torsion capabilities and meeting the requirements for workpieces that need to be fixed with high torque. Therefore, this utility model uses teeth and annular grooves to simultaneously reinforce and lock, improve anti-torsion performance, enhance anti-rotation effect, and achieve better locking effect, effectively preventing the rivet nut from falling off the workpiece. Attached Figure Description

[0018] Figure 1 This is a perspective view of the self-piercing press-fit nut provided by this utility model.

[0019] Figure 2 A second perspective view of the self-piercing press-fit nut provided by this utility model.

[0020] Figure 3 A third perspective view of the self-piercing press-fit nut provided by this utility model.

[0021] Figure 4 The fourth perspective view of the self-piercing press-fit nut provided by this utility model.

[0022] Figure 5 This is a front view of the self-piercing press-fit nut provided by this utility model.

[0023] Figure 6 This is a bottom view of the self-piercing press-fit nut provided by this utility model.

[0024] Figure 7 This is a top view of the self-piercing press-fit nut provided by this utility model.

[0025] In the figure: 1. Nut body; 2. Punchout part; 3. Tooth; 4. Engaging part; 5. First annular surface; 6. Second annular surface; 7. Inner hole; 8. Internal thread; 9. Annular groove; 10. Inner chamfer. Detailed Implementation

[0026] 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, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0027] In this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" 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 based on the specific circumstances.

[0028] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0029] like Figures 1-7 As shown, this embodiment provides a self-piercing press-fit nut, including a nut body 1. The nut body 1 is provided with an inner hole 7. One end of the nut body 1 extends with a punched portion 2 and an engaging portion 4 fixedly connected thereto. The engaging portion 4 is located outside the punched portion 2. The outer diameter of the punched portion 2 increases from the end facing the nut body 1 to the end away from the nut body 1. The inner diameter of the engaging portion 4 decreases from the end facing the nut body 1 to the end away from the nut body 1. A first annular surface 5 is provided on the outer side of the punched portion 2. A second annular surface 6 is provided on the inner side of the engaging portion 4. An annular groove 9 is provided between the first annular surface 5, the second annular surface 6 and the nut body 1.

[0030] This utility model provides a self-piercing press-fit nut. The punched part 2 at the bottom of the nut body 1 can directly drill an installation hole in the workpiece during the installation process, realizing the function of self-piercing the workpiece. Therefore, it is not necessary to open the installation hole in the workpiece in advance, saving a workpiece drilling process and greatly improving the installation efficiency of the press-fit nut.

[0031] In some embodiments, a plurality of teeth 3 are fixedly connected circumferentially to one end of the nut body 1 facing the annular groove 9, one end of the teeth 3 extending to the first annular surface 5 and the other end extending to the second annular surface 6.

[0032] In some embodiments, the punched portion 2 is fixedly connected to the middle of one end of the nut body 1, and the inner hole 7 penetrates the nut body 1 and the punched portion 2.

[0033] In some embodiments, the engagement portion 4 is fixedly connected to the edge of one end of the nut body 1.

[0034] In some embodiments, the height of the breaking portion 2 is higher than the height of the engaging portion 4.

[0035] In some embodiments, the radial cross-sections of the nut body 1, the punched portion 2, and the engaging portion 4 are all annular, the minimum inner diameter of the punched portion 2 is equal to the diameter of the inner hole 7 of the nut body 1, and the maximum outer diameter of the engaging portion 4 is equal to the outer diameter of the nut body 1.

[0036] In some embodiments, the nut body 1, the punched portion 2, and the engaging portion 4 are coaxial.

[0037] In some embodiments, the nut body 1 and the punched portion 2, as well as the nut body 1 and the engaging portion 4, are all integral structures. This structure makes the entire self-piercing press-fit nut stronger, meeting the high-strength connection requirements between it and the workpiece.

[0038] In some embodiments, the nut body 1 is provided with an inner chamfer 10 at one end away from the annular groove 9, and the inner chamfer 10 extends to the inner hole 7.

[0039] In this embodiment, the inner chamfer 10 provides a guide for the internal mounting bolts of the subsequent press-fit nut, facilitating bolt insertion and making the installation operation simple and quick, greatly improving installation efficiency.

[0040] In some embodiments, the inner hole 7 is provided with an internal thread 8.

[0041] In use, when the press-fit nut is fixed to the workpiece, the punched portion 2 at the bottom of the nut body 1 can directly drill a mounting hole in the workpiece during installation, achieving a self-piercing effect. This eliminates the need to pre-drill mounting holes in the workpiece, saving a step of workpiece drilling and greatly improving the installation efficiency of the press-fit nut. Specifically, during the fixing process, the punched portion 2 makes full contact with the workpiece and is subjected to external force. Under pressure, the end of the punched portion 2 directly drills a mounting hole in the workpiece. As the punched portion 2 continues to press into the workpiece under pressure, plastic deformation occurs around the drilled mounting hole, and the deformed material is squeezed into the annular groove 9.

[0042] Since the outer diameter of the punched part 2 increases from the end facing the nut body 1 to the end away from the nut body 1, and the inner diameter of the engaging part 4 decreases from the end facing the nut body 1 to the end away from the nut body 1, the first annular surface 5 is an annular inclined surface that gradually expands outward, and the second annular surface 6 is an annular inclined surface that gradually contracts inward. This makes the deformable part tightly fixed in the annular groove 9 provided between the first annular surface 5, the second annular surface 6 and the nut body 1. The deformable part in the annular groove 9 forms a locking ring. This locking ring can make the press-fit nut tightly fixed to the workpiece, improve the connection strength between the nut and the workpiece, prevent shaking, and effectively prevent the press-fit nut from falling off the workpiece. Meanwhile, since several teeth 3 are fixedly connected circumferentially at one end of the nut body 1 facing the annular groove 9, the punched part 2 drives the teeth 3 to be pressed in together during the pressing process of the workpiece. Through pressure, the deformable material in the annular groove 9 is squeezed into the spaces between the teeth 3 of the rivet nut, thereby producing a good locking effect. This makes it difficult for the rivet nut and the workpiece to rotate relative to each other, and it has strong anti-torsion ability, which can meet the needs of workpieces that need to be fixed by high torque. Therefore, this utility model uses the teeth 3 and the annular groove 9 to simultaneously play a role in strengthening and locking, improving anti-torsion performance, improving anti-rotation effect, and providing a better locking effect, which can effectively prevent the rivet nut from falling off the workpiece.

[0043] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0044] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model.

[0045] This document uses specific embodiments to illustrate the principles and implementation methods of this utility model. The descriptions of these embodiments are merely for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that those skilled in the art can make various improvements and modifications to this utility model without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A self-piercing press-fit nut, characterized in that, The nut includes a nut body with an inner hole. One end of the nut body extends to a punched portion and an engaging portion fixedly connected thereto. The engaging portion is located outside the punched portion. The outer diameter of the punched portion increases from the end facing the nut body to the end away from the nut body. The inner diameter of the engaging portion decreases from the end facing the nut body to the end away from the nut body. A first annular surface is provided on the outer side of the punched portion, and a second annular surface is provided on the inner side of the engaging portion. An annular groove is provided between the first annular surface, the second annular surface, and the nut body.

2. The self-piercing press-fit nut according to claim 1, characterized in that, The nut body has a number of teeth fixedly connected circumferentially at one end facing the annular groove, with one end of the teeth extending to the first annular surface and the other end extending to the second annular surface.

3. The self-piercing press-fit nut according to claim 1, characterized in that, The punched portion is fixedly connected to the middle of one end of the nut body, and the inner hole penetrates the nut body and the punched portion.

4. The self-piercing press-fit nut according to claim 1, characterized in that, The engaging part is fixedly connected to the edge of one end of the nut body.

5. The self-piercing press-fit nut according to claim 1, characterized in that, The height of the punched portion is higher than the height of the meshing portion.

6. The self-piercing press-fit nut according to claim 1, characterized in that, The nut body, the punched portion, and the engaging portion all have annular cross-sections along the radial direction. The minimum inner diameter of the punched portion is equal to the diameter of the inner hole of the nut body, and the maximum outer diameter of the engaging portion is equal to the outer diameter of the nut body.

7. The self-piercing press-fit nut according to claim 1, characterized in that, The nut body, the punched part, and the engaging part are coaxial.

8. The self-piercing press-fit nut according to claim 1, characterized in that, The nut body and the punched part, as well as the nut body and the engaging part, are all integral structures.

9. The self-piercing press-fit nut according to claim 1, characterized in that, The nut body has an inner chamfer at the end away from the annular groove, and the inner chamfer extends into the inner hole.

10. The self-piercing press-fit nut according to any one of claims 1-9, characterized in that, The inner hole is provided with internal threads.

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