Pressing rivet nut and fastening structure for soft metal plate

Abstract

The utility model provides a pressing rivet nut and a fastening structure for a soft metal plate. The pressing rivet nut comprises a flange part and a pressing rivet part, wherein the flange part is provided with a discharging face suitable for abutting against a plate; the anti-torsion teeth are arranged on the discharging face and spaced from one another, any anti-torsion tooth extends outwards from the outer wall face of the pressing rivet nut in the radial direction of the pressing rivet nut, any anti-torsion tooth comprises a first end located on the outer side in the radial direction, and the distance L between any first end and the center line of the pressing rivet nut and the nominal diameter D of the pressing rivet nut meet the condition that L is larger than or equal to 3 / 2D. According to the technical scheme, the problem that in the prior art, when a pressing rivet nut is applied to a soft metal plate, the effect is poor is solved.

Description

Technical Field

[0001] This utility model relates to the field of fasteners, specifically providing a press-fit nut and fastening structure for soft metal sheets. Background Technology

[0002] A press-fit nut, also known as a rivet nut or self-locking nut, is a type of nut used on thin sheets or sheet metal. It is round in shape with knurled teeth and a guide groove at one end. Its working principle involves pressing the knurled teeth into a pre-drilled hole in the sheet metal. Generally, the diameter of the pre-drilled hole is slightly smaller than the knurled teeth of the press-fit nut. Pressure forces the knurled teeth into the sheet, causing plastic deformation around the pre-drilled hole. The deformed material is then forced into the guide groove, thus creating a locking effect.

[0003] When press-fit nuts are used on soft metal sheets in the prior art, they tend to embed themselves into the sheet. Because soft metal sheets have good ductility, the torsional resistance of press-fit nuts in the prior art is also difficult to achieve, resulting in phenomena such as stripping.

[0004] Therefore, a new technical solution is needed in this field to solve the above problems. Utility Model Content

[0005] To address the problem of poor performance of existing press-fit nuts when applied to soft metal sheets, this invention provides a press-fit nut for soft metal sheets. The press-fit nut of this invention includes: a flange portion having a discharge surface adapted to abut against the sheet metal; and a plurality of anti-torsion teeth, the anti-torsion teeth being disposed on the discharge surface and spaced apart from each other. Each anti-torsion tooth extends radially outward from the outer wall surface of the press-fit nut, and each anti-torsion tooth includes a first end located on the radially outer side. The distance L of each first end relative to the centerline of the press-fit nut satisfies the condition L≥3 / 2D with respect to the nominal diameter D of the press-fit nut.

[0006] This utility model's press-fit nut uses a flange with a discharge surface that abuts against a soft metal sheet. Anti-torsion teeth are provided on the discharge surface to prevent stripping of the press-fit nut. Specifically, multiple anti-torsion teeth are spaced apart so that after the anti-torsion teeth are embedded in the sheet, the undeformed sheet between adjacent anti-torsion teeth provides a resisting torque opposite to the tightening torque, thus preventing stripping. Each anti-torsion tooth extends radially outward from the outer wall of the press-fit nut, making its actual length the effective length, minimizing manufacturing costs. The distance L from the first end relative to the centerline of the press-fit nut satisfies L≥3 / 2D with respect to the nominal diameter D of the press-fit nut. This ensures that the anti-torsion teeth have sufficient effective length for torsion resistance and that the outer diameter of the discharge surface with the anti-torsion teeth is flush with or extends beyond the first end, reducing the pressure between the press-fit nut and the sheet during installation and preventing excessive embedding of the press-fit nut into the soft metal sheet, which could lead to sheet strength loss.

[0007] In the preferred embodiment of the press-fit nut described above, the height h of any of the anti-torsion teeth relative to the discharge surface gradually increases from the inside to the outside along the radial direction. The anti-torsion effect is stronger the portion of the anti-torsion tooth further away from the center line of the press-fit nut. Through the above arrangement, some material of the anti-torsion teeth is eliminated, and the manufacturing cost is reduced as much as possible while ensuring the anti-torsion effect.

[0008] In the preferred embodiment of the above-described press-fit nut, the width w of any of the anti-torsion teeth gradually increases from the inside to the outside along the radial direction, and the ratio of the height h to the width w satisfies: h / w ≥ 0.9. Through the above configuration, the press-fit nut of this invention has a much higher torsional resistance on soft sheet metal than ordinary press-fit nuts, and it can reduce the mold closing pressure when installing the press-fit nut onto the sheet metal, thus improving installation efficiency.

[0009] In the preferred embodiment of the aforementioned press-fit nut, the discharge surface is configured as a rotating surface, and its centerline coincides with the centerline of the press-fit nut. The discharge surface is inclined away from the centerline of the press-fit nut. During press-fit nut installation, the pressure generated by the closing of the upper and lower dies located on both sides of the sheet metal typically presses the nut into the corresponding mounting hole on the sheet metal. However, the stress is concentrated at the edge of the mounting hole, and the plating on the non-mounting side of the sheet metal is easily damaged due to the higher stress. With the above-described configuration, the discharge surface of the press-fit nut in this application is inclined away from the centerline of the press-fit nut. Utilizing the good ductility of the soft metal sheet, it guides the sheet metal on the mounting side to flow, reducing the stress on the edge of the mounting hole, thereby protecting the plating on the non-mounting side and minimizing the impact of the press-fit nut on the sheet metal.

[0010] In the preferred embodiment of the press-fit nut described above, the press-fit nut further includes a material receiving groove for accommodating material flowing from the metal sheet due to deformation. The material receiving groove is formed on the outer wall of the press-fit nut and located on the side of the flange portion where the anti-torsion teeth are located. With this configuration, when the sheet metal is pressed against the discharge surface, the anti-torsion teeth, and the outer wall of the press-fit nut, the sheet metal can flow into the material receiving groove, allowing the press-fit nut and the sheet metal to form a riveting connection.

[0011] In the preferred embodiment of the aforementioned press-fit nut, the material receiving groove includes a bottom surface inclined towards the flange, which is connected to the discharge surface. The bottom surface is provided with multiple reinforcing ribs extending along the centerline of the press-fit nut, and each reinforcing rib is connected to its corresponding anti-torsion tooth. This arrangement connects the bottom surface of the material receiving groove to the discharge surface, facilitating the balancing of the deformed portion of the sheet metal flowing into the material receiving groove. This prevents easily deformable soft metal from squeezing the outer wall of the press-fit nut (specifically, squeezing the area on the outer wall where the wall thickness is smaller due to the material receiving groove), thus avoiding deformation or even failure of the threaded hole of the press-fit nut. The reinforcing ribs connected to the anti-torsion teeth on the bottom surface further ensure the strength of the bottom surface of the material receiving groove, preventing deformation caused by the soft metal flowing into the groove and affecting the function of the threaded hole.

[0012] In the preferred embodiment of the press-fit nut described above, the press-fit nut further includes a threaded hole, the depth of which is D. p Satisfy D p ≥0.8D. With the above settings, the press-fit nut of this utility model can be adapted to high-strength bolts.

[0013] To address the problem of poor performance of existing press-fit nuts when applied to soft metal sheets, this invention provides a fastening structure. The fastening structure of this invention includes: a soft metal sheet with mounting holes; a press-fit nut, at least a portion of which is accommodated in the mounting holes and includes: a flange having a discharge surface abutting against the soft metal sheet; and a plurality of anti-torsion teeth, the anti-torsion teeth being disposed on the discharge surface and spaced apart from each other. Each anti-torsion tooth extends radially outward from the outer wall surface of the press-fit nut, and each anti-torsion tooth includes a first end located on the radially outer side. The distance L of the first end relative to the centerline of the press-fit nut satisfies the condition L≥3 / 2D with respect to the nominal diameter D of the press-fit nut. With this configuration, the press-fit nut in the fastening structure of this invention is less prone to stripping. The fact that each anti-torsion tooth extends radially outward from the outer wall surface of the press-fit nut ensures that the actual length of the anti-torsion tooth is the effective length, minimizing manufacturing costs. The distance L between the first end and the center line of the press-fit nut satisfies L≥3 / 2D with respect to the nominal diameter D of the press-fit nut. This ensures that the anti-torsion teeth have sufficient effective length for anti-torsion and that the outer diameter of the discharge surface with anti-torsion teeth is flush with or exceeds the first end. This reduces the pressure between the press-fit nut and the plate during installation and prevents the press-fit nut from being over-embedded in the soft metal plate, which would result in a loss of plate strength.

[0014] In the preferred embodiment of the fastening structure described above, the height h1 of the first end relative to the discharge surface is in a predetermined proportion to the thickness of the flexible metal sheet. With this configuration, when the height of the first end is in a predetermined proportion to the sheet thickness, the first end will not excessively weaken the sheet's strength after being embedded in it, while simultaneously providing high torsional resistance for the rivet nut.

[0015] In the preferred embodiment of the above-described fastening structure, the flexible metal sheet is made of pure aluminum or pure copper. Through this configuration, the fastening structure of this invention can be applied to pure aluminum or pure copper sheets with good ductility, while ensuring that the rivet nut does not strip or become over-embedded on the flexible metal sheet. Attached Figure Description

[0016] The preferred embodiments of this utility model are described below with reference to the accompanying drawings, in which:

[0017] Figure 1 This is a schematic diagram of an embodiment of the press-fit nut for soft metal sheets according to this utility model;

[0018] Figure 2 This is a front view of an embodiment of the press-fit nut for soft metal sheets according to this utility model;

[0019] Figure 3yes Figure 2 A cross-sectional view of an embodiment of a press-fit nut for soft metal sheets;

[0020] Figure 4 This is a bottom view of an embodiment of the press-fit nut for soft metal sheets according to this utility model;

[0021] Figure 5 This is a cross-sectional view of an embodiment of the fastening structure of this utility model.

[0022] List of reference numerals in the attached diagram:

[0023] 100. Press-fit nut; 10. Nut body; 11. Threaded hole; 12. Outer wall surface; 20. Flange; 21. Discharge surface; 30. Anti-torsion tooth; 31. First end; 32. Second end; 40. Material receiving groove; 41. Bottom surface; 42. Reinforcing rib; 500. Fastening structure; 501. Soft metal sheet; 502. Mounting hole. Detailed Implementation

[0024] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0025] It should be noted that in the description of this utility model, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection, an indirect connection through an intermediate medium, or a connection within 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.

[0027] To address the problem of poor performance of existing press-fit nuts when applied to soft metal sheets, this invention provides a press-fit nut 100 for soft metal sheets. The press-fit nut 100 of this invention includes: a flange portion 20 having a discharge surface 21 adapted to abut against the sheet material; and a plurality of anti-torsion teeth 30, the anti-torsion teeth 30 being disposed on the discharge surface 21 and spaced apart from each other. Each anti-torsion tooth 30 extends radially outward from the outer wall surface 12 of the press-fit nut 100, and each anti-torsion tooth 30 includes a first end portion 31 located radially outward. The distance L of each first end portion 31 relative to the centerline of the press-fit nut 100 satisfies the following condition with respect to the nominal diameter D of the press-fit nut 100: L ≥ 3 / 2D.

[0028] Figure 1 This is a schematic diagram of an embodiment of the press-fit nut for soft metal sheets according to this utility model; Figure 2 This is a front view of an embodiment of the press-fit nut for soft metal sheets according to this utility model; Figure 3 yes Figure 2 A cross-sectional view of an embodiment of a press-fit nut for soft metal sheets; Figure 4 This is a bottom view of an embodiment of the press-fit nut for soft metal sheets according to this utility model. Figures 1 to 4 As shown, in one or more embodiments, the press-fit nut 100 of the present invention for soft metal sheets includes a nut body 10 and a flange portion 20 formed on the nut body 10.

[0029] In one or more embodiments, the nut body 10 extends along a predetermined direction and has a centerline C, configured as a generally cylindrical shape. Alternatively, the nut body 10 may be configured into other suitable shapes as needed. A threaded hole 11 is formed inside the nut body 10 so that after the press-fit nut 100 is installed on a plate, the threaded hole 11 is used to engage with a bolt, thereby securing a suitable device to the plate. In one or more embodiments, the depth Dp of the threaded hole 11 satisfies Dp greater than or equal to 0.8D, where D is the nominal diameter of the threaded hole 11. With the above configuration, the press-fit nut 100 of this invention can be adapted to high-strength bolts.

[0030] Continue reading Figure 1 and Figure 2 In one or more embodiments, the nut body 10 includes an outer wall surface 12, and the flange portion 20 is configured in an annular shape surrounding the outer wall surface 12. Alternatively, the flange portion 20 may also be configured in other suitable shapes as needed.

[0031] In one or more embodiments, the outer diameter of the flange 20 is larger than the outer diameter of the outer wall surface 12 of the nut body 10. The flange 20 bears the main responsibility for compressing and deforming the plate, thereby minimizing the wall thickness of the nut body 10 and reducing the volume of the press-fit nut, saving raw materials and reducing weight. Alternatively, the side of the nut body 10 opposite to the discharge surface 21 (based on...) Figure 2 The flange portion 20 is positioned as shown above the flange portion 20 and is configured to be flush with or larger than the outer diameter of the flange portion 20 to improve its strength.

[0032] based on Figure 2As shown in the orientation, in one or more embodiments, the flange 20 has a downwardly inclined discharge surface 21. The discharge surface 21 can be configured as a generally conical surface of rotation, with the centerline of the rivet nut 100 as a reference. The discharge surface 21 is inclined away from the centerline of the rivet nut 100, and the centerline of rotation of the discharge surface 21 coincides with the centerline of the rivet nut 100. The discharge surface 21 is adapted to abut against the sheet metal, forcing the sheet metal to deform and guiding the material flow on the sheet metal. In the prior art, the plane where the rivet nut 100 is located at the discharge surface 21 is usually a plane perpendicular to the centerline. When the upper and lower dies used for installing the rivet nut close to embed the rivet nut 100 into the mounting hole 502 on the sheet metal, the stress on the edge of the mounting hole 502 is relatively concentrated. The plating on the non-mounting side of the sheet metal is easily damaged due to the higher stress. With the above configuration, the discharge surface 21 of the press-fit nut 100 of this application is inclined away from the center line of the press-fit nut 100. Taking advantage of the good ductility of the soft metal sheet 501, the sheet material on the mounting side (the mounting side and the non-mounting side refer to the two sides opposite to each other of the sheet material, and the side where the flange 20 is located is the mounting side) is guided to flow, thereby reducing the stress on the edge of the mounting hole 502 of the sheet material, thus protecting the coating on the non-mounting side and minimizing the impact of the press-fit nut 100 on the sheet material.

[0033] Continue reading Figure 2 and Figure 3 In one or more embodiments, the press-fit nut 100 further includes anti-torsion teeth 30. The anti-torsion teeth 30 are disposed on the discharge surface 21 and spaced apart from each other, so that material deformed on the sheet metal flows into the gap between adjacent anti-torsion teeth 30, thereby achieving an anti-torsion effect. Any anti-torsion tooth 30 extends radially outward from the outer wall surface 12 along the press-fit nut 100. In one or more embodiments, any anti-torsion tooth 30 includes a first end 31 located radially outward, which may be flush with the outer edge of the flange portion 20. Alternatively, the first end 31 may also be located inside the outer edge of the flange portion 20. The distance L of any first end 31 relative to the centerline of the press-fit nut 100 satisfies L≥3 / 2D. In other words, the diameter of the circle in which the first ends 31 are located is at least 3 times the nominal diameter of the press-fit nut 100, thereby satisfying the anti-torsion requirements of the press-fit nut 100 on the soft metal sheet 501 and preventing excessive embedment into the soft metal sheet 501.

[0034] Continue reading Figure 3In one or more embodiments, along the radial direction of the rivet nut 100 from the inside out, the height h of any anti-torsion tooth 30 relative to the discharge surface 21 gradually increases. The anti-torsion effect of the anti-torsion tooth 30 is stronger the further away from the center line of the rivet nut 100. Through the above-mentioned setting, some material of the anti-torsion tooth 30 is saved, and the manufacturing cost is reduced as much as possible while ensuring the anti-torsion effect. Furthermore, along the radial direction of the rivet nut 100 from the inside out, the width w of any anti-torsion tooth 30 gradually increases, and the ratio of height h to width w satisfies h / w≥0.9. Through the above-mentioned setting, the anti-torsion ability of the rivet nut 100 of this utility model on soft plates is much higher than that of ordinary rivet nuts 100, and it can reduce the mold closing pressure of installing the rivet nut 100 onto the plate, thereby improving the installation efficiency.

[0035] like Figure 3 As shown, in one or more embodiments, the number of anti-torsion teeth 30 can be eight that are equally spaced. Alternatively, the number of anti-torsion teeth 30 can also be other suitable numbers, such as six, ten, etc.

[0036] Continue reading Figure 1 and Figure 3 In one or more embodiments, the press-fit nut 100 further includes a material receiving groove 40 for receiving material flowing on the sheet metal due to deformation. The material receiving groove 40 is formed on the outer wall surface 12 and recessed into the interior of the press-fit nut 100. The material receiving groove 40 is located on the side of the flange portion 20 provided with anti-torsion teeth 30, based on... Figure 2 As shown, the material receiving trough 40 is located below the flange 20 so that the press-fit nut 100 can be inserted downward into the plate. Under the action of the discharge surface 21, the material on the plate flows into the material receiving trough 40.

[0037] Furthermore, in one or more embodiments, the material receiving trough 40 includes a bottom surface 41 inclined toward the flange portion 20. The bottom surface 41 is configured as a surface of revolution and forms an angle with the centerline of the press-fit nut 100, so that after the deformed material on the plate flows into the material receiving trough 40, the movement of the press-fit nut 100 along its centerline direction is restricted by the flange portion 20 and the ground, respectively, to prevent the press-fit nut 100 from falling off the plate. The bottom surface 41 can be connected to the discharge surface 21, and the connection method can be a rounded corner transition connection.

[0038] Continue reading Figure 4In one or more embodiments, a plurality of reinforcing ribs 42 are provided on the bottom surface 41. The number of reinforcing ribs 42 is the same as the number of anti-torsion teeth 30, and each reinforcing rib 42 is connected to a corresponding anti-torsion tooth 30. Each anti-torsion tooth 30 includes a second end 32 located radially inward of the press-fit nut 100, and the reinforcing rib 42 is connected to the second end 32. The reinforcing ribs 42 and the anti-torsion teeth 30 can be integrally formed, for example, manufactured integrally by a cold heading process. Alternatively, the number of reinforcing ribs 42 can also be configured to be more or less than the number of anti-torsion teeth 30. Due to the good ductility of the soft metal sheet 501, the material flow at the edge of its mounting hole 502 is good. After driving the sheet material to flow at locations such as the discharge surface 21, the outer wall surface 12, and the anti-torsion teeth 30, a large amount of material will flow into the receiving groove 40 formed by the bottom surface 41 and the discharge surface 21. Compared to other sheet materials, the material flowing into the soft metal sheet 501 exerts greater pressure on the thinner sections of the rivet nut 100 (in this embodiment, the intersection of the ground and the discharge surface 21), causing deformation of the threaded hole 11. Through the aforementioned arrangement, the reinforcing rib 42 prevents deformation or even failure of the threaded hole 11 of the rivet nut 100, further ensuring the strength of the bottom surface 41 of the material receiving tank 40 and preventing deformation caused by the soft metal flowing into the material receiving tank 40, thus affecting the function of the threaded hole 11.

[0039] Figure 4 This is a cross-sectional view of an embodiment of the fastening structure of this utility model. This utility model also provides a fastening structure 500. (As shown...) Figure 4 As shown, the fastening structure 500 of this utility model includes a flexible metal plate 501 and the aforementioned press-fit nut 100. In one or more embodiments, the flexible metal plate 501 is provided with a mounting hole 502, and at least a portion of the press-fit nut 100 is accommodated in the mounting hole 502. The flexible metal plate 501 may be made of pure aluminum or pure copper.

[0040] In one or more embodiments, the press-fit nut 100 includes anti-torsion teeth 30, each including a first end 31 located radially outward of the press-fit nut 100. The height h1 of the first end 31 relative to the discharge surface 21 is in a predetermined ratio to the thickness of the flexible metal sheet 501. The predetermined ratio is between 0.25 and 0.28. Alternatively, h1 and the thickness of the flexible metal sheet 501 may also form other suitable ratios.

[0041] The technical solution of this utility model has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the protection scope of this utility model is obviously not limited to these specific embodiments. Without departing from the principle of this utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of this utility model.

Claims

1. A press-fit nut for soft metal sheets, characterized in that, The press-fit nut includes: A flange portion having a discharge surface adapted to abut against a sheet metal; and Multiple anti-torsion teeth are disposed on the discharge surface and spaced apart from each other. Each anti-torsion tooth extends outward from the outer wall surface of the press-fit nut along the radial direction of the press-fit nut. Along the radial direction from the inside to the outside, the height h of each anti-torsion tooth relative to the discharge surface gradually increases. Each anti-torsion tooth includes a first end located on the outer side of the radial direction. The distance L of each first end relative to the center line of the press-fit nut satisfies the condition L≥3 / 2D with respect to the nominal diameter D of the press-fit nut.

2. The press-fit nut according to claim 1, characterized in that, Along the radial direction from the inside out, the width w of any of the anti-torsion teeth gradually increases, and the ratio of the height h to the width w satisfies: h / w≥0.

9.

3. The press-fit nut according to claim 1, characterized in that, The discharge surface is configured as a rotating surface and its centerline coincides with the centerline of the press-fit nut, and the discharge surface is inclined away from the centerline of the press-fit nut.

4. The press-fit nut according to claim 1, characterized in that, The press-fit nut also includes a material receiving groove for accommodating material flowing on the plate due to deformation, the material receiving groove being formed on the outer wall surface and located on the side of the flange portion provided with the anti-torsion teeth.

5. The press-fit nut according to claim 4, characterized in that, The material receiving tank includes a bottom surface that is inclined toward the flange portion, and the bottom surface is connected to the discharge surface; The bottom surface is provided with a plurality of reinforcing ribs extending along the center line of the press-fit nut, and each of the reinforcing ribs is connected to its corresponding anti-torsion tooth.

6. The press-fit nut according to claim 1, characterized in that, The press-fit nut also includes a threaded hole, the depth of which is D. p Satisfy D p ≥0.8D.

7. A fastening structure, characterized in that, The fastening structure includes: A flexible metal sheet, the flexible metal sheet including mounting holes; and A press-fit nut, at least a portion of which is received in the mounting hole and comprising: a flange having a discharge surface abutting against the soft metal sheet; and a plurality of anti-torsion teeth disposed on the discharge surface and spaced apart from each other, each anti-torsion tooth extending radially outward from the outer wall surface of the press-fit nut, from the inside out along the radial direction, the height h of each anti-torsion tooth relative to the discharge surface gradually increasing, each anti-torsion tooth including a first end located on the radially outer side, the distance L of the first end relative to the centerline of the press-fit nut satisfying L≥3 / 2D with respect to the nominal diameter D of the press-fit nut.

8. The fastening structure according to claim 7, characterized in that, The height h1 of the first end relative to the discharge surface is in a predetermined proportion to the thickness of the flexible metal sheet.

9. The fastening structure according to claim 7, characterized in that, The flexible metal sheet is made of pure aluminum or pure copper.

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