Sealing rivet nut and connecting system

Abstract

The utility model provides a sealing rivet nut and a connecting system, the sealing rivet nut is used for riveting a workpiece, and the sealing rivet nut comprises a head flange and a rod part connected to one end of the head flange; a plurality of first anti-skid teeth are arranged on the outer wall of the rod part in the circumferential direction of the rod part. The end face, facing the rod part, of the head flange is provided with an adhesive part and a plurality of second anti-skid teeth, the second anti-skid teeth surround the rod part in the circumferential direction, and the adhesive part surrounds the periphery of the second anti-skid teeth. According to the sealing rivet nut, the sealing characteristic and the anti-skid characteristic are obviously partitioned, mutual influence and restriction are avoided, and a connecting system formed by riveting the sealing rivet nut and a workpiece has excellent anti-rotation performance and sealing performance at the same time.

Description

Technical Field

[0001] This utility model belongs to the field of fastener technology, and in particular relates to a sealing rivet nut and connection system. Background Technology

[0002] A rivet nut is a type of nut that is fastened to the connected parts by riveting. It is currently widely used in the assembly of electromechanical and light industrial products such as automobiles, aviation, instruments, furniture, and decoration. It was developed to address the shortcomings of welded nuts on thin metal sheets and tubes, such as easy melting and stripping of internal threads. It eliminates the need for tapping internal threads and welding, provides a strong and efficient riveting connection, and is easy to use.

[0003] In existing technologies, to make rivet nuts have anti-rotation properties, anti-slip teeth are often provided on the lower end face of the head flange (i.e., the end face facing the rod along the axial direction) and the rod, so that they can fit into the workpiece after the riveting structure is formed; if it is also necessary to ensure the sealing effect at the riveting point, sealant will be applied, and the application position of the sealant coincides with the area where the anti-slip teeth are set on the lower end face of the head flange. However, in actual use, it was found that because the sealing and anti-rotation features are located in the same area, they will affect and restrict each other, resulting in greater uncertainty and risk, and a simultaneous reduction in sealing and anti-slip performance: In the existing technology, the lower end face of the flange is flat without grooves or steps, and the applied sealant will flow freely. After riveting, the elastic deformation of the solid sealant also results in a thickness, and the resulting spatial distance is also large, which greatly reduces the anti-slip effect of the anti-slip teeth in the same area; the sealant part will also hinder the material flow of the workpiece, resulting in incomplete contact between the lower end face of the head flange and the workpiece, uneven sealing, and reduced sealing performance; in addition, after riveting, the applied sealant is prone to gaps (discontinuous sealant coverage after extrusion), which will also reduce its sealing performance. Utility Model Content

[0004] In view of the problems existing in the prior art, the main purpose of this utility model is to provide a sealing rivet nut and connection system. The provided sealing rivet nut clearly separates its sealing features and anti-slip features to avoid mutual interference and restriction, so that the connection system formed by the rivet nut and the workpiece has excellent anti-rotation performance and sealing performance at the same time.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] This utility model provides a sealing rivet nut for riveting workpieces, comprising a head flange and a shank connected to one end of the head flange; wherein,

[0007] The outer wall of the rod is provided with a plurality of first anti-slip teeth along its circumference;

[0008] The head flange has an adhesive portion and a plurality of second anti-slip teeth on its end face facing the rod. The plurality of second anti-slip teeth surround the rod in the circumferential direction, and the adhesive portion surrounds the periphery of the plurality of second anti-slip teeth.

[0009] As a further description of the above technical solution, the adhesive part includes a groove formed by the end face of the head flange facing the rod portion recessed inward and a sealant applied in the groove;

[0010] Before the sealing rivet nut is riveted to the workpiece, the sealant protrudes axially from the end face of the head flange facing the rod.

[0011] After the sealing rivet nut is riveted to the workpiece, the axial surface of the sealant facing the rod is flush with the end face of the head flange facing the rod, and abuts against the end face of the workpiece facing the head flange.

[0012] As a further description of the above technical solution, the groove is located between the circumferential outer edge of the head flange and the second anti-slip tooth; or,

[0013] The outer circumferential edge of the groove coincides with the outer circumferential edge of the head flange.

[0014] As a further description of the above technical solution, the rod includes an expansion section and a threaded section, wherein the expansion section is connected between the head flange and the threaded section;

[0015] The first anti-slip tooth is provided on the outer wall of the expansion section;

[0016] The expansion section can expand outward to form a riveting expansion protrusion when the sealing rivet nut rivets the workpiece, and the riveting expansion protrusion and the head flange can clamp the workpiece axially.

[0017] As a further description of the above technical solution, the outer diameter of the expansion section is the same as the outer diameter of the threaded section, and is smaller than the outer diameter of the head flange.

[0018] As a further description of the above technical solution, it also includes an extension hole extending axially from the head flange to one end of the rod portion. The extension hole includes at least a first hole section and a second hole section arranged coaxially. The first hole section is closer to the end of the head flange away from the threaded section than the second hole section.

[0019] The diameter of the first hole is larger than that of the second hole, and the inner wall of the second hole is formed with internal threads.

[0020] As a further description of the above technical solution, the first hole section is axially disposed within the head flange and the expansion section;

[0021] The second hole is provided axially within the threaded section.

[0022] As a further description of the above technical solution, the head flange and the shank of the rivet nut are integrally connected.

[0023] This utility model also provides a connection system, the connection system comprising:

[0024] The workpiece has rivet holes.

[0025] As described above, the expansion portion of the sealing rivet nut is interference-fitted into the rivet hole of the workpiece at the part connected to the head flange; the part of the expansion portion connected to the threaded section expands outward under tensile force to form a rivet expansion protrusion, which cooperates with the head flange to clamp the workpiece.

[0026] The structure is detachably connected to the extension hole of the sealing rivet nut.

[0027] As a further description of the above technical solution, the riveting expansion protrusion is provided with a plurality of first anti-slip teeth on the end face of the workpiece, and the head flange is provided with a plurality of second anti-slip teeth on the end face of the workpiece; the first anti-slip teeth and the second anti-slip teeth are both engaged with the workpiece.

[0028] An adhesive portion is also provided on the end face of the head flange facing the workpiece, and the adhesive portion surrounds the periphery of the plurality of second anti-slip teeth; the adhesive surface of the adhesive portion facing the rod along the axial direction is flush with the end face of the head flange facing the rod, and abuts against the end face of the workpiece facing the head flange.

[0029] Based on the above technical solutions, the outstanding effects of this utility model are as follows:

[0030] When using this sealing rivet nut to rivet a workpiece, the installation method is the same as other sealing rivet nuts, using a riveting tool (such as a rivet gun). After the shank passes through the workpiece, it expands outward to form a riveting expansion protrusion, which engages with the end face of the head flange facing the shank to clamp the workpiece. When the workpiece is clamped by the riveting expansion protrusion and the end face of the head flange facing the shank, some of the workpiece material flows into the gap between the first anti-slip teeth on the end face of the head flange facing the shank and the second anti-slip teeth circumferentially provided on the outer wall of the shank. This creates a mating connection between the workpiece and the sealing rivet nut, making it difficult for them to rotate relative to each other circumferentially. The adhesive portion on the end face of the head flange facing the shank also fills the gap between the head flange and the riveting expansion protrusion, thus providing a seal. Since the adhesive portion surrounds the multiple second anti-slip teeth and they do not overlap, the sealing and anti-rotation (slipping) functions are clearly separated, avoiding mutual interference / constraint. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the rivet nut structure in the first embodiment of this utility model;

[0032] Figure 2 This is a schematic diagram of the connection system in the first embodiment of the present invention;

[0033] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0034] Figure 4 This is a schematic diagram of the rivet nut structure in the second embodiment of this utility model;

[0035] Figure 5 This is a schematic diagram of the connection system in the second embodiment of the present invention.

[0036] Figure 6 for Figure 5 Enlarged view of point B in the middle.

[0037] Explanation of icon numbers:

[0038] 1. Sealing rivet nut; 11. Head flange; 12. Rod; 121. Expansion section; 122. Threaded section; 13. Extension hole; 2. Workpiece; 3. First anti-slip tooth; 4. Adhesive part; 41. Groove; 42. Sealant; 5. Second anti-slip tooth; 6. Riveting expansion protrusion; 7. Internal thread. Detailed Implementation

[0039] 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.

[0040] In the description of this utility model, it should be noted that the terms "upper," "middle," "lower," "inner," "outer," "front," "rear," "left," and "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for simplifying the description, and do not 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. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. The implementation methods of this utility model will now be described based on its overall structure.

[0041] Please see Figures 1 to 6 This utility model discloses a sealing rivet nut 1 and a connection system. The disclosed sealing rivet nut 1 is used for riveting workpieces 2 and includes a head flange 11 and a rod 12 connected to one end of the head flange 11; wherein,

[0042] The outer wall of the rod 12 is provided with a plurality of first anti-slip teeth 3 along its circumference;

[0043] The head flange 11 is provided with an adhesive portion 4 and a plurality of second anti-slip teeth 5 on the end face facing the rod portion 12. The plurality of second anti-slip teeth 5 surround the rod portion 12 in the circumferential direction, and the adhesive portion 4 surrounds the periphery of the plurality of second anti-slip teeth 5.

[0044] With the above structure, when the sealing rivet nut 1 is used to rivet the workpiece 2, it can be installed in the same way as other sealing rivet nuts 1 by means of a rivet tool (e.g., a rivet gun). After its shank 12 passes through the workpiece 2, the shank 12 expands outward to form a rivet expansion protrusion 6, so as to cooperate with the end face of the head flange 11 facing the shank 12 to clamp the workpiece 2. When the workpiece 2 is clamped by the riveting expansion protrusion 6 and the end face of the head flange 11 facing the rod 12, some of the material of the workpiece 2 flows into the gap between the first anti-slip teeth 3 on the end face of the head flange 11 facing the rod 12 and the second anti-slip teeth 5 on the outer wall of the rod 12 along its circumference. This creates a mating connection between the workpiece 2 and the sealing rivet nut 1, making it difficult for the workpiece 2 and the sealing rivet nut 1 to rotate relative to each other in the circumferential direction. The adhesive portion 4 on the end face of the head flange 11 facing the rod 12 also fills the gap between the head flange 11 and the riveting expansion protrusion 6, thus providing a sealing effect. Since the adhesive portion 4 surrounds the periphery of the plurality of second anti-slip teeth 5 and they do not overlap, the sealing and anti-rotation (slipping) functions are clearly separated, avoiding mutual influence / constraint.

[0045] Please see Figures 1 to 6 Specifically, the adhesive part 4 in this utility model includes a groove 41 formed by the inward recess of the end face of the head flange 11 toward the rod 12 and a sealant 42 applied in the groove 41. Before the sealing rivet nut 1 is riveted to the workpiece 2, the adhesive surface of the sealant 42 along the axial direction toward the rod 12 protrudes slightly from the end face of the head flange 11 toward the rod 12. During the riveting process, the sealant 42 is squeezed and elastically deforms into the groove 41. Thus, after the sealing rivet nut 1 is riveted to the workpiece 2, the adhesive surface of the sealant 42 along the axial direction toward the rod 12 is flush with the end face of the head flange 11 toward the rod 12 and abuts against the end face of the workpiece 2 toward the head flange 11, thereby achieving a sealing effect.

[0046] Please see Figures 1 to 3 Specifically, in the first embodiment, the groove 41 is located between the circumferential outer edge of the head flange 11 and the second anti-slip tooth 5. During the riveting process of the sealing rivet nut 1 and the workpiece 2, the sealant 42 in the groove 41 will be pressed into the groove 41 and undergo elastic deformation to fill the groove 41, while simultaneously tightly fitting with the corresponding area of ​​the workpiece 2 (i.e., the part of the workpiece 2 facing the groove 41 opening along the axial direction) to form a sealing structure. Figures 4 to 6As shown, unlike the first embodiment, in the second embodiment, the circumferential outer edge of the groove 41 coincides with the circumferential outer edge of the head flange 11. During the riveting process of the sealing rivet nut 1 and the workpiece 2, the sealant 42 in the groove 41 is pressed into the groove 41 and undergoes elastic deformation to fill the space between the groove 41 and the workpiece 2 to form a seal. Since there is no obstruction on its outer periphery, it will also undergo radial elastic deformation and overflow to the outer edge of the head flange 11. However, it should be understood that this arrangement makes the amount of sealant 42 used more approximate without affecting the sealing effect between the workpiece 2 and the sealing rivet nut 1, which is more conducive to the production of the sealing rivet nut 1.

[0047] Specifically, in this embodiment, the rod portion 12 includes an expansion section 121 and a threaded section 122. The expansion section 121 is connected between the head flange 11 at its left end and the threaded section 122 at its right end. The first anti-slip tooth 3 is provided on the outer wall of the expansion section 121. The expansion section 121 can expand outward to form a riveting expansion protrusion 6 when the sealing rivet nut 1 rivets the workpiece 2. The riveting expansion protrusion 6 can clamp the workpiece 2 axially with the head flange 11. The first anti-slip tooth 3 will partially deform together with the expansion section 121 during the riveting process. Finally, the part of the tooth located on the end face of the riveting expansion protrusion 6 facing the workpiece 2 will engage with the workpiece 2 to ensure that the sealing rivet nut 1 and the workpiece 2 have sufficient torque after riveting.

[0048] Please see Figure 1 and Figure 2 Specifically, in this embodiment, the outer diameter of the expansion section 121 is the same as the outer diameter of the threaded section 122, and is smaller than the outer diameter of the head flange 11.

[0049] Specifically, in this embodiment, the sealing rivet nut 1 has an extension hole 13 extending axially from the head flange 11 towards one end of the rod portion 12. The extension hole 13 includes at least a first hole section and a second hole section arranged coaxially. The first hole section is closer to the end of the head flange 11 away from the threaded section 122 than the second hole section. The diameter of the first hole section is larger than the diameter of the second hole section. An internal thread 7 is formed on the inner sidewall of the second hole section for mounting a suitable structure (not shown in the figure), such as an external hexagonal bolt. More specifically, in this embodiment, the first hole section is axially disposed within the head flange 11 and the expansion section 121; the second hole section is axially disposed within the threaded section 122.

[0050] Specifically, in this embodiment, the head flange 11 and the rod 12 of the rivet nut are integrally connected. It can be directly formed by cold forging and then tapped to form the internal thread 7 on the inner wall of the second section hole.

[0051] Please see Figures 2 to 3 ,as well as Figures 5 to 6 Specifically, the connection system disclosed in this utility model includes a workpiece 2, a sealing rivet nut 1 as described above, and a structural body. The workpiece 2 has a riveting hole. The expansion portion of the sealing rivet nut 1, which is connected to the head flange 11, is interference-fitted into the riveting hole of the workpiece 2. The portion of the expansion portion connected to the threaded section 122 expands outward under tension to form a riveting expansion protrusion 6. The riveting expansion protrusion 6 and the head flange 11 cooperate to clamp the workpiece 2. The structural body is detachably connected to the extension hole 13 of the sealing rivet nut 1. For example, the structural body can be selected as an external hexagonal bolt. Of course, in other embodiments, other structural bodies that can be detachably connected to the extension hole 13 of the sealing rivet nut 1 can be selected according to actual needs.

[0052] Specifically, in the first and second embodiments, the riveting expansion protrusion 6 is provided with multiple first anti-slip teeth 3 on its end face facing the workpiece 2, and the head flange 11 is provided with multiple second anti-slip teeth 5 on its end face facing the workpiece 2. The first anti-slip teeth 3 and the second anti-slip teeth 5 are mutually engaged with the workpiece 2, thereby preventing relative rotation between the sealing rivet nut 1 and the workpiece 2 during the disassembly or connection of the structure and the sealing rivet nut 1. It should be understood that the multiple first anti-slip teeth 3 on the end face of the riveting expansion protrusion 6 facing the workpiece 2 have also undergone a certain deformation compared to before the riveting expansion protrusion 6 was formed (i.e., they expand outwards synchronously with the formation of the riveting expansion protrusion 6). Each end face of the head flange 11 facing the workpiece 2 is provided with an adhesive portion 4. The adhesive portion 4 surrounds the periphery of the plurality of second anti-slip teeth 5, so as not to affect or restrict the circumferential anti-slip (rotation) performance of the second anti-slip teeth 5. The adhesive surface of the adhesive portion 4 facing the rod portion 12 along the axial direction is flush with the end face of the head flange 11 facing the rod portion 12, and abuts against the end face of the workpiece 2 facing the head flange 11 to form a sealing structure. The remaining part of the end face of the head flange 11 facing the rod portion 12 is tightly fitted with the workpiece 2, thereby improving the sealing performance.

[0053] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any changes, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A sealing riv-nut for use in riveting workpieces, characterized in that, The head flange and the rod part are connected. The outer wall of the rod part is provided with a plurality of first anti-skid teeth along the circumference thereof. The end surface of the head flange towards the rod part is provided with a glue part and a plurality of second anti-skid teeth, the plurality of second anti-skid teeth surround the rod part in the circumferential direction, and the glue part surrounds the periphery of the plurality of second anti-skid teeth.

2. The sealed riv-nut according to claim 1, characterized in that The glue part comprises a groove recessed inward from the end surface of the head flange towards the rod part, and a sealant applied in the groove. Before the seal rivet nut is riveted with the workpiece, the sealant protrudes from the end surface of the head flange towards the rod part in the axial direction. After the seal rivet nut is riveted with the workpiece, the glue surface of the sealant towards the rod part is flush with the end surface of the head flange towards the rod part, and abuts against the end surface of the workpiece towards the head flange.

3. The sealed riv-nut according to claim 2, characterized in that The groove is located between the circumferential outer edge of the head flange and the second anti-skid teeth; or The circumferential outer edge of the groove coincides with the circumferential outer edge of the head flange.

4. The sealed riv-nut according to claim 1, characterized in that The rod part comprises an expansion section and a threaded section, and the expansion section is connected between the head flange and the threaded section. The first anti-skid teeth are provided on the outer wall of the expansion section. The expansion section can expand outward to form a riveting expansion protrusion when the seal rivet nut is riveted with the workpiece, and the riveting expansion protrusion can clamp the workpiece along the axial direction with the head flange.

5. The sealed riv-nut according to claim 4, characterized in that The outer diameter of the expansion section is the same as the outer diameter of the threaded section, and smaller than the outer diameter of the head flange.

6. The sealed riv-nut according to claim 4, characterized in that It also comprises an extension hole extending from the head flange towards the end of the rod part in the axial direction, and the extension hole comprises at least a first hole section and a second hole section arranged coaxially, and the first hole section is closer to the end of the head flange away from the threaded section than the second hole section. The hole diameter of the first hole section is larger than the hole diameter of the second hole section, and the inner side wall of the second hole section is formed with internal threads.

7. The sealed riv-nut according to claim 6, characterized in that The first hole section is arranged in the head flange and the expansion section in the axial direction. The second hole section is arranged in the threaded section in the axial direction.

8. The sealed riv-nut of claim 1, wherein, The head flange and the rod part of the rivet nut are connected in an integral manner.

9. A connection system, characterized in that The connection system comprises: A workpiece, and a riveting hole is formed in the workpiece; The seal rivet nut according to any one of claims 1-8, the part of the expansion section connected with the head flange is interference-fitted in the riveting hole of the workpiece, and the part of the expansion section connected with the threaded section expands outward to form a riveting expansion protrusion under the action of tension, and the riveting expansion protrusion clamps the workpiece in cooperation with the head flange; A structure body is detachably connected in the extension hole of the seal rivet nut.

10. The connection system of claim 9, wherein, The riveting expansion protrusion is provided with a plurality of first anti-skid teeth on the end surface of the workpiece, and the head flange is provided with a plurality of second anti-skid teeth on the end surface towards the workpiece; the first anti-skid teeth and the second anti-skid teeth are embedded with each other with the workpiece. The head flange is further provided with a glue part around the periphery of the second plurality of anti-skid teeth, the glue part is flush with the end face of the head flange towards the rod part in the axial direction, and is in abutment with the end face of the workpiece towards the head flange.

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