Sealing rivet nut and connecting system

Abstract

The invention 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 of the sealing characteristic and the anti-skid characteristic 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] The present invention belongs to the technical field of fasteners, and in particular relates to a sealed rivet nut and a connection system. Background Art

[0002] Pull-on rivet nuts are fastened to connected components by means of pull rivets. They are currently widely used in the assembly of electromechanical and light industrial products such as automobiles, aviation, instruments, furniture, and decoration. Developed to address the shortcomings of welded nuts on thin metal sheets and thin tubes, such as the tendency for them to melt and the tendency for internal threads to slip, they eliminate the need for internal thread tapping or welding, resulting in a secure, efficient, and easy-to-use riveted connection.

[0003] In the prior art, in order to make the rivet nut have anti-rotation performance, anti-slip teeth are often provided on the lower end face of its head flange (i.e., its end face facing the rod in the axial direction) and the rod, so as to engage with the riveted workpiece after the riveted structure is formed; if the sealing effect of the riveted joint needs to be ensured at the same time, sealant will be applied, and the application position of the sealant coincides with the area where the anti-slip teeth on the lower end face of the head flange are provided. However, during actual use, it was found that since the sealing and anti-rotation features are in the same area, they will affect and restrict each other, the uncertainty risk is relatively large, and the sealing and anti-slip performance are reduced at the same time: in the prior art, the lower end face of the flange is flat, without grooves and steps, and the coated sealant will flow freely. After riveting, the elastic deformation of the solid sealant also has a thickness, and the spatial distance formed 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 fit between the lower end face of the head flange and the workpiece, uneven sealing, and reduced sealing performance; in addition, the applied sealant is prone to glue-breaking areas after riveting (the glue coverage is discontinuous after extrusion), which will also reduce its sealing performance. Summary of the Invention

[0004] In view of the above-mentioned problems existing in the prior art, the main purpose of the present invention is to provide a sealed rivet nut and a connection system. The provided sealed rivet nut clearly divides its sealing characteristics and anti-slip characteristics to avoid their mutual influence and restriction, so that the connection system formed by riveting itself with the workpiece has excellent anti-rotation performance and sealing performance.

[0005] The purpose of the present invention is achieved through the following technical solutions:

[0006] The present invention provides a sealed rivet nut, which is used for riveting workpieces, and comprises a head flange and a rod connected to one end of the head flange; wherein,

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

[0008] An adhesive portion and a plurality of second anti-slip teeth are provided on the end surface of the head flange facing the rod portion. The plurality of second anti-slip teeth circumferentially surround the rod portion, 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 portion includes a groove formed by the end surface of the head flange being recessed inward toward the rod portion, and a sealant applied in the groove;

[0010] Before the sealing rivet nut is riveted to the workpiece, the sealant surface facing the rod in the axial direction protrudes from the end surface of the head flange facing the rod;

[0011] After the sealing rivet nut is riveted to the workpiece, the sealant surface axially 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 teeth; or,

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

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

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

[0016] The expansion section can expand outwards to form a riveting expansion protrusion when the sealing rivet nut is riveted to the workpiece. The riveting expansion protrusion can clamp the workpiece axially together with the head flange.

[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, the invention further includes an extension hole extending axially from the head flange to one end of the rod portion, the extension hole including at least a first hole segment and a second hole segment coaxially arranged, the first hole segment being closer to the end of the head flange away from the threaded segment than the second hole segment;

[0019] The aperture of the first hole segment is larger than that of the second hole segment, and an internal thread is formed on the inner side wall of the second hole segment.

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

[0021] The second hole section is axially arranged in the threaded section.

[0022] As a further description of the above technical solution, the head flange and the rod of the rivet nut are connected in an integrated manner.

[0023] The present invention also provides a connection system, comprising:

[0024] A workpiece, wherein a rivet hole is formed on the workpiece;

[0025] In the sealed rivet nut described above, the portion where the expansion portion is connected to the head flange is interference-fitted into the riveted hole of the workpiece; the portion where the expansion portion is connected to the threaded section expands outward under the action of tension to form a riveted expansion protrusion, which cooperates with the head flange to clamp the workpiece;

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

[0027] As a further description of the above technical solution, the riveted expansion protrusion is provided with a plurality of first anti-slip teeth on the end surface facing the workpiece, and the head flange is provided with a plurality of second anti-slip teeth on the end surface facing 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 surface of the head flange facing the workpiece, and the adhesive portion surrounds the periphery of the multiple second anti-slip teeth; the adhesive surface of the adhesive portion axially facing the rod is flush with the end surface of the head flange facing the rod, and is against the end surface of the workpiece facing the head flange.

[0029] By means of the above technical solutions, the outstanding effects of the present invention are:

[0030] When using this sealing rivet nut to rivet a workpiece, similar to other sealing rivet nut installation methods, a rivet tool (e.g., a rivet gun) can be used. After the shank of the rivet nut passes through the workpiece, the shank expands outward to form a rivet expansion protrusion, which cooperates with the end face of the head flange facing the shank to clamp the workpiece. When the workpiece is clamped by the rivet 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 provided on the end face of the head flange facing the shank and the second anti-slip teeth provided along the circumference of the outer wall of the shank, thereby forming a mating connection structure between the workpiece and the sealing rivet nut, making it difficult for the workpiece and the sealing rivet nut to rotate relative to each other in the circumferential direction. The adhesive portion provided on the end face of the head flange facing the shank also fills the gap between the head flange and the rivet expansion protrusion, thereby providing a seal. In particular, because the adhesive portion surrounds the periphery of the multiple second anti-slip teeth and the two do not overlap, the sealing and anti-rotation (slip) functions are clearly distinguished from each other, avoiding mutual influence / restriction. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic structural diagram of a rivet nut according to the first embodiment of the present invention;

[0032] Figure 2 This is a schematic structural diagram of a connection system in a 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 structural diagram of a rivet nut according to a second embodiment of the present invention;

[0035] Figure 5 A schematic diagram of the structure 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] Description of Figure 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 portion; 41. Groove; 42. Sealant; 5. Second anti-slip tooth; 6. Riveted expansion protrusion; 7. Internal thread. DETAILED DESCRIPTION

[0039] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0040] In the description of the present invention, it should be noted that the terms "upper", "middle", "lower", "inside", "outside", "front", "back", "left", "right", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The following describes an implementation method of the present invention based on its overall structure.

[0041] See also Figures 1 to 6 The present invention discloses a sealed rivet nut 1 and a connection system. The disclosed sealed rivet nut 1 is used for riveting a workpiece 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 portion 12 is provided with a plurality of first anti-slip teeth 3 along its circumference;

[0043] The end surface of the head flange 11 facing the rod 12 is provided with an adhesive portion 4 and a plurality of second anti-slip teeth 5 . The plurality of second anti-slip teeth 5 circumferentially surround the rod 12 , 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, a rivet tool (such as a rivet gun) can be used as the installation method of other sealing rivet nuts 1, so that after its rod 12 passes through the workpiece 2, the rod 12 expands outward to form a rivet expansion protrusion 6, which cooperates with the end face of the head flange 11 facing the rod 12 to clamp the workpiece 2. When the workpiece 2 is clamped by the riveted expansion protrusion 6 and the end face of the head flange 11 facing the rod 12, part of the material of the workpiece 2 will flow into the gap between the first anti-slip teeth 3 provided on the end face of the head flange 11 facing the rod 12 and the second anti-slip teeth 5 provided along the circumference of the outer wall of the rod 12, thereby forming a mating connection structure 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, and the adhesive portion 4 provided on the end face of the head flange 11 facing the rod 12 will also fill the gap between the head flange 11 and the riveted expansion protrusion 6, thereby playing a sealing role. Among them, because the adhesive portion 4 surrounds the periphery of the multiple second anti-slip teeth 5, the two do not overlap, and the sealing and anti-rotation (slip) functions are clearly distinguished from each other, avoiding mutual influence / restriction.

[0045] See also Figures 1 to 6 Specifically, the adhesive portion 4 in the present invention includes a groove 41 formed by an inward depression of the end surface of the head flange 11 toward the rod 12 and a sealant 42 applied to the groove 41; before the sealing rivet nut 1 is riveted to the workpiece 2, the sealant 42 has an axial surface facing the rod 12 that slightly protrudes from the end surface of the head flange 11 facing the rod 12; during the riveting process, the sealant 42 is squeezed and elastically deformed into the groove 41, so that after the sealing rivet nut 1 is riveted to the workpiece 2, the sealant 42 has an axial surface facing the rod 12 that is flush with the end surface of the head flange 11 facing the rod 12, and abuts against the end surface of the workpiece 2 facing the head flange 11, so as to play a sealing role.

[0046] See also 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 teeth 5. During the riveting process between the sealed rivet nut 1 and the workpiece 2, the sealant 42 in the groove 41 will be pressed into the groove 41 and elastically deformed to fill the groove 41. At the same time, it will closely fit with the workpiece 2 in the corresponding area (i.e., the part of the workpiece 2 facing the notch of the groove 41 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 elastically deforms to fill the groove 41 and form a seal between the groove 41 and the workpiece 2. Since there is no obstruction on its periphery, radial elastic deformation will also occur and overflow to the outer edge of the head flange 11. However, it should be understood that this setting method makes the usage parameters of the sealant 42 rougher 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 12 includes an expansion section 121 and a threaded section 122, and 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 is riveted to the workpiece 2, and the riveting expansion protrusion 6 can axially clamp the workpiece 2 with the head flange 11, and the first anti-slip tooth 3 will be partially deformed together with the expansion section 121 during the riveting action, and finally the part thereof located on the end face of the riveting expansion protrusion 6 facing the workpiece 2 will be interlocked with the workpiece 2 to ensure that the sealing rivet nut 1 and the workpiece 2 have sufficient torque after riveting.

[0048] See also 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 to one end of the rod 12. The extension hole 13 includes at least a first hole segment and a second hole segment arranged coaxially. The first hole segment is closer to the end of the head flange 11 away from the threaded segment 122 than the second hole segment. The aperture of the first hole segment is larger than the aperture of the second hole segment. The inner side wall of the second hole segment is formed with an internal thread 7 so that a structure (not shown in the figure) adapted thereto can be installed therein. The structure is, for example, an external hexagonal bolt. More specifically, in this embodiment, the first hole segment is axially arranged within the head flange 11 and the expansion segment 121; the second hole segment is axially arranged within the threaded segment 122.

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

[0051] See also Figures 2 to 3 ,as well as Figures 5 and 6 Specifically, the connection system disclosed in the present invention includes a workpiece 2, the sealing rivet nut 1 as described above, and a structure, wherein a rivet hole is opened on the workpiece 2; the portion of the expansion portion of the sealing rivet nut 1 connected to the head flange 11 is interference-fitted into the rivet hole of the workpiece 2; the portion of the expansion portion connected to the threaded section 122 expands outward under the action of tension to form a rivet expansion protrusion 6, and the rivet expansion protrusion 6 cooperates with the head flange 11 to clamp the workpiece 2; the structure is detachably connected to the extension hole 13 of the sealing rivet nut 1, and the structure is, for example, an external hexagonal bolt. Of course, in other embodiments, other structures that can be detachably connected to the extension hole 13 of the sealing rivet nut 1 can also be selected according to actual needs.

[0052] Specifically, in the first and second embodiments, the end surface of the rivet expansion protrusion 6 facing the workpiece 2 is provided with a plurality of first anti-slip teeth 3, and the end surface of the head flange 11 facing the workpiece 2 is provided with a plurality of second anti-slip teeth 5; the first anti-slip teeth 3 and the second anti-slip teeth 5 are both engaged with the workpiece 2, so that during the disassembly or connection process between the structure and the sealed rivet nut 1, the sealed rivet nut 1 and the workpiece 2 are not easily rotated relative to each other. It should be understood that the plurality of first anti-slip teeth 3 provided on the end surface of the rivet expansion protrusion 6 facing the workpiece 2 have also undergone a certain deformation compared to before the rivet expansion protrusion 6 is formed (that is, they have expanded outward synchronously with the formation of the rivet expansion protrusion 6). The end surface of the head flange 11 facing the workpiece 2 is also provided with an adhesive portion 4, and the adhesive portion 4 surrounds the periphery of the multiple second anti-slip teeth 5, so as not to affect the circumferential anti-slip (rotation) performance of the second anti-slip teeth 5; the adhesive surface of the adhesive portion 4 axially facing the rod 12 is flush with the end surface of the head flange 11 facing the rod 12, and is abutted against the end surface of the workpiece 2 facing the head flange 11 to form a sealing structure, and the rest of the end surface of the head flange 11 facing the rod 12 is tightly fitted with the workpiece 2, thereby improving the sealing performance.

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

Claims

1. A sealed rivet nut for riveting workpieces, characterized in that: It includes a head flange and a rod connected to one end of the head flange; wherein, The outer wall of the rod portion is provided with a plurality of first anti-slip teeth along its circumference; An adhesive portion and a plurality of second anti-slip teeth are provided on the end surface of the head flange facing the rod portion. The plurality of second anti-slip teeth circumferentially surround the rod portion, and the adhesive portion surrounds the periphery of the plurality of second anti-slip teeth.

2. The sealed rivet nut according to claim 1, characterized in that: The adhesive portion includes a groove formed by the end surface of the head flange being recessed inwardly toward the rod portion, and a sealant applied in the groove; Before the sealing rivet nut is riveted to the workpiece, the sealant surface facing the rod in the axial direction protrudes from the end surface of the head flange facing the rod; After the sealing rivet nut is riveted to the workpiece, the sealant surface axially 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.

3. The sealed rivet 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-slip teeth; or, The circumferential outer edge of the groove coincides with the circumferential outer edge of the head flange.

4. The sealed rivet nut according to claim 1, characterized in that: The rod portion includes an expansion section and a threaded section, wherein the expansion section is connected between the head flange and the threaded section; The first anti-slip teeth are provided on the outer wall of the expansion section; The expansion section can expand outwards to form a riveting expansion protrusion when the sealing rivet nut is riveted to the workpiece. The riveting expansion protrusion can clamp the workpiece axially together with the head flange.

5. The sealed rivet 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 is smaller than the outer diameter of the head flange.

6. The sealed rivet nut according to claim 4, characterized in that: The invention also includes an extension hole extending axially from the head flange to one end of the rod portion, the extension hole including at least a first hole segment and a second hole segment arranged coaxially, the first hole segment being closer to the end of the head flange away from the threaded segment than the second hole segment; The aperture of the first hole segment is larger than that of the second hole segment, and an internal thread is formed on the inner side wall of the second hole segment.

7. The sealed rivet nut according to claim 6, characterized in that: The first hole section is axially arranged in the head flange and the expansion section; The second hole section is axially arranged in the threaded section.

8. The sealed rivet nut according to claim 1, characterized in that: The head flange and the stem of the rivet nut are connected in an integrated manner.

9. A connection system, characterized in that: The connection system comprises: A workpiece, wherein a rivet hole is formed on the workpiece; The sealed rivet nut according to any one of claims 1 to 8, wherein the portion where the expansion portion is connected to the head flange is interference fit in the riveted hole of the workpiece; the portion where the expansion portion is connected to the threaded section expands outward under the action of tension to form a riveted expansion protrusion, and the riveted expansion protrusion cooperates with the head flange to clamp the workpiece; A structure is detachably connected to the extension hole of the sealing rivet nut.

10. The connection system according to claim 9, characterized in that The riveted expansion protrusion is provided with a plurality of first anti-slip teeth on the end surface facing the workpiece, and the head flange is provided with a plurality of second anti-slip teeth on the end surface facing the workpiece; the first anti-slip teeth and the second anti-slip teeth are both engaged with the workpiece; An adhesive portion is also provided on the end surface of the head flange facing the workpiece, and the adhesive portion surrounds the periphery of the multiple second anti-slip teeth; the adhesive surface of the adhesive portion axially facing the rod is flush with the end surface of the head flange facing the rod, and is against the end surface of the workpiece facing the head flange.

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