Countersunk rivet nut and connecting system

Abstract

The utility model provides a countersunk head rivet nut and a connecting system, the provided countersunk head rivet nut is used for riveting a workpiece and 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 a countersunk wedge face, and a plurality of second anti-skid teeth are arranged on the countersunk wedge face in the circumferential direction of the countersunk wedge face. The second anti-skid teeth and the first anti-skid teeth are connected or disconnected in a one-to-one correspondence manner; when a workpiece is riveted, the rod part can expand outwards to form a riveting expansion protrusion to be matched with the countersunk wedge face of the head flange to clamp the workpiece, and the first anti-skid teeth and the second anti-skid teeth can be embedded into the workpiece. According to the countersunk rivet nut, the countersunk wedge surface structure is optimized, and the rotating torque performance of the countersunk rivet nut can be improved to a greater extent.

Description

Technical Field

[0001] The utility model belongs to the technical field of fasteners, and in particular relates to a countersunk rivet nut and a connection system. Background Art

[0002] Blind rivet nuts can be riveted from one side, offering simple operation and providing threaded mounting points for various sheet materials and profiles. They are widely used in the automotive, aviation, railway, refrigeration, elevator, switch, instrumentation, furniture, and decoration industries. Blind rivet nuts are classified into six types based on head shape: countersunk head and flat head. However, during assembly with a workpiece, the head flange of a flat-head rivet nut creates a circular, pancake-shaped protrusion, affecting both fit and aesthetics. In contrast, the head flange of a countersunk rivet nut has a narrow, countersunk shape that sinks into a prefabricated groove in the workpiece. After assembly, the resulting protrusion is minimal, maintaining a nearly flat surface and ensuring a tighter fit and aesthetically pleasing finish.

[0003] According to the rivet body (stem) structure, rivet nuts can be divided into hexagonal and round shapes. Hexagonal rivet nuts have a natural anti-rotation performance compared to round rivet nuts and are more favored by designers. However, in some application scenarios, round rivet nuts must be used. Therefore, in order to make them anti-rotation, strip teeth are usually set on the outer wall of the rivet body structure along the axial direction. When the rivet body structure forms a riveted expansion protrusion due to the riveting action and clamps the workpiece axially with the head flange, the strip teeth will engage with the end face of the workpiece axially away from the head flange. Therefore, during the process of tightening the matching bolt and the nut, the rivet nut and the workpiece are not easy to slide relative to each other in the circumferential direction, thereby increasing the torque. However, the head flange of the countersunk rivet nut is relatively narrow, so the contact area between it and the workpiece in the axial direction is small, which leads to limited torque increase. In addition, the nut surface is usually formed with an electroplated layer. Compared with cold-headed parts, its surface is smoother, but the friction coefficient is reduced, so its rotational torque value is attenuated to varying degrees. Utility Model Content

[0004] In view of the problems existing in the above-mentioned prior art, the main purpose of the present invention is to provide a countersunk rivet nut and a connection system. The provided countersunk rivet nut optimizes its countersunk wedge surface structure, which can maximize its own rotational torque performance.

[0005] The purpose of the utility model is achieved through the following technical solutions:

[0006] The utility model provides a countersunk 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] The end surface of the head flange facing the rod portion is a countersunk wedge surface, and the countersunk wedge surface is provided with a plurality of second anti-slip teeth along its circumference; the second anti-slip teeth are connected or disconnected with the first anti-slip teeth in a one-to-one correspondence;

[0009] When riveting a workpiece, the rod portion can expand outward to form a riveting expansion protrusion to cooperate with the countersunk wedge surface of the head flange to clamp the workpiece, and the first anti-slip teeth and the second anti-slip teeth can both engage with the workpiece.

[0010] 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;

[0011] The first anti-slip teeth are provided on the outer wall of the expansion section;

[0012] The expansion section can expand outwards to form a riveting expansion protrusion when the countersunk rivet nut is riveted to the workpiece. The riveting expansion protrusion can clamp the workpiece axially together with the head flange.

[0013] 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.

[0014] As a further description of the above technical solution, the countersunk rivet nut is provided with a through hole along the axial direction, and the through hole includes at least a first section hole and a second section hole arranged coaxially. The first section hole is closer to the end of the head flange away from the threaded section than the second section hole. The aperture of the first section hole is larger than the aperture of the second section hole, and an internal thread is formed on the inner wall of the second section hole.

[0015] As a further description of the above technical solution, the first section hole is axially arranged in the head flange and the expansion section;

[0016] The second section hole is axially arranged in the threaded section.

[0017] As a further description of the above technical solution, the head flange and the rod of the countersunk rivet nut are connected in an integrated manner.

[0018] As a further description of the above technical solution, the number of the first anti-slip teeth and the number of the second anti-slip teeth are 36.

[0019] As a further description of the above technical solution, the first anti-slip teeth and the second anti-slip teeth are both equidistantly distributed along the circumference of the countersunk rivet nut.

[0020] The present invention also provides a connection system, comprising:

[0021] A workpiece, wherein a slot is formed on the workpiece;

[0022] In the countersunk rivet nut described above, the portion where the expansion portion is connected to the head flange is interference-fitted into the slotted 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;

[0023] A structure is detachably connected to the through hole of the countersunk rivet nut.

[0024] As a further description of the above technical solution, the end surface of the riveted expansion protrusion facing the workpiece is provided with a plurality of first anti-slip teeth, and the countersunk wedge surface of the head flange facing the workpiece is provided with a plurality of second anti-slip teeth.

[0025] The first anti-slip teeth and the second anti-slip teeth are both engaged with the workpiece.

[0026] By means of the above technical solutions, the outstanding effects of the present invention are:

[0027] The countersunk rivet nut provided by the utility model includes a head flange and a rod connected to one end of the head flange. A plurality of first anti-slip teeth are circumferentially arranged on the countersunk wedge surface of the head flange facing the rod, and the first anti-slip teeth are connected or disconnected in a one-to-one correspondence with the plurality of first anti-slip teeth originally provided on the outer wall of the rod along its circumference. When the countersunk rivet nut is used to rivet a workpiece, the installation method of other countersunk rivet nuts can be used with the help of a riveting tool (such as a rivet gun), so that after its rod passes through the workpiece, the rod expands outward to form a riveting expansion protrusion, which cooperates with the countersunk wedge surface of the head flange to clamp the workpiece. Since the countersunk wedge surface is provided with a plurality of second anti-slip teeth along its circumference, which are connected or disconnected in a one-to-one correspondence with the first anti-slip teeth on the outside of the rod, when the workpiece is clamped by the riveted expansion protrusion and the countersunk wedge surface, part of the material of the workpiece not only flows into the gap between the first anti-slip teeth, so that the workpiece and the first anti-slip teeth are interlocked, but also flows into the gap between the second anti-slip teeth, so that the workpiece and the second anti-slip teeth are simultaneously interlocked. As a result, the countersunk rivet nut maximizes its own rotational torque performance. After it is riveted to the workpiece, it can maintain the fastening connection effect with the workpiece more stably and is not prone to relative sliding with the workpiece in the circumferential direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is an axial half-section view of a countersunk rivet nut in an embodiment of the present utility model;

[0029] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0030] Figure 3 This is a bottom view of the countersunk rivet nut in the embodiment of the present utility model;

[0031] Figure 4 This is a structural diagram of the connection system in an embodiment of the present utility model;

[0032] Figure 5 for Figure 4 Enlarged view of point B in the middle.

[0033] Description of Figure Numbers:

[0034] 1. Countersunk rivet nut; 11. Head flange; 111. Countersunk wedge surface; 12. Rod; 121. Expansion section; 122. Threaded section; 13. Through hole; 131. First section hole; 132. Second section hole; 2. Workpiece; 21. Slotted hole; 3. First anti-slip tooth; 4. Second anti-slip tooth; 5. Riveted expansion protrusion; 6. Internal thread. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described 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.

[0036] 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 the implementation of the present invention based on its overall structure.

[0037] See also Figures 1 to 5 The utility model discloses a countersunk rivet nut 1 and a connection system. The disclosed countersunk rivet nut 1 is used for riveting a workpiece 2, and comprises a head flange 11 and a rod 12 connected to one end of the head flange 11; wherein,

[0038] The outer wall of the rod portion 12 is provided with a plurality of first anti-slip teeth 3 along its circumference;

[0039] The end surface of the head flange 11 facing the rod 12 is a countersunk wedge surface 111, and the countersunk wedge surface 111 is provided with a plurality of second anti-slip teeth 4 along its circumference; the second anti-slip teeth 4 are connected or disconnected with the first anti-slip teeth 3 in a one-to-one correspondence;

[0040] When riveting the workpiece 2, the rod 12 can expand outward to form a riveting expansion protrusion 5 and cooperate with the countersunk wedge surface 111 of the head flange 11 to clamp the workpiece 2, and the first anti-slip teeth 3 and the second anti-slip teeth 4 can both be interlocked with the workpiece 2.

[0041] With the above structure, when the countersunk rivet nut 1 is used to rivet the workpiece 2, a rivet tool (such as a rivet gun) can be used in the same installation method as other countersunk rivet nuts 1. After its rod 12 passes through the workpiece 2, the rod 12 expands outward to form a rivet expansion protrusion 5 and cooperates with the countersunk wedge surface 111 of the head flange 11 to clamp the workpiece 2. Since the countersunk wedge surface 111 is provided with a plurality of second anti-slip teeth 4 along its circumference, which are connected or disconnected one by one with the first anti-slip teeth 3 on the outside of the rod 12, when the workpiece 2 is clamped by the rivet expansion protrusion 5 and the countersunk wedge surface 111, part of the material of the workpiece 2 not only flows into the gap of the first anti-slip teeth 3, so that the workpiece 2 and the first anti-slip teeth 3 are interlocked, but also flows into the gap of the second anti-slip teeth 4, so that it is simultaneously interlocked with the second anti-slip teeth 4. As a result, the countersunk rivet nut 1 maximizes its own rotational torque performance. After it is riveted to the workpiece 2, it can overcome the problem of the relatively narrow head flange 11 of the countersunk rivet nut 1, and more stably maintain the fastening connection effect with the workpiece 2, and is not prone to relative sliding with the workpiece 2 in the circumferential direction.

[0042] See also Figure 1 ,as well as Figures 4 and 5 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 upper end and the threaded section 122 at its lower end; the first anti-slip teeth 3 are provided on the outer wall of the expansion section 121; the expansion section 121 can expand outward to form a riveting expansion protrusion 5 when the countersunk rivet nut 1 is riveted to the workpiece 2, and the riveting expansion protrusion 5 can axially clamp the workpiece 2 with the head flange 11, and the first anti-slip teeth 3 will be partially deformed together with the expansion section 121 during the riveting action, and finally the part thereof located on the end surface of the riveting expansion protrusion 5 facing upward toward the workpiece 2 will be engaged with the workpiece 2 to ensure that the countersunk rivet nut 1 and the workpiece 2 have sufficient torque after riveting.

[0043] 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 .

[0044] Specifically, in this embodiment, the countersunk rivet nut 1 is provided with a through hole 13 along the axial direction. The through hole 13 includes at least a first section hole 131 and a second section hole 132 arranged coaxially. The first section hole 131 is closer to the upper end of the head flange 11 away from the threaded section 122 than the second section hole 132. The aperture of the first section hole 131 is larger than the aperture of the second section hole 132. The inner side wall of the second section hole 132 is formed with an internal thread 6, so that a structure (not shown in the figure) adapted thereto can be installed therein, such as an external hexagonal bolt. More specifically, in this embodiment, the first section hole 131 is axially arranged within the head flange 11 and the expansion section 121; the second section hole 132 is axially arranged within the threaded section 122.

[0045] Specifically, in this embodiment, the head flange 11 and the stem 12 of the countersunk rivet nut 1 are connected in an integral manner, and can be directly formed by a cold heading process and then tapped to form the internal thread 6 on the inner wall of the second section hole 132. It should be understood that the first anti-slip teeth 3 and the second anti-slip teeth 4 can be directly formed in the cold heading step. Compared with the provision of anti-slip ribs, the protrusion volume of the second anti-slip teeth 4 is smaller. After the countersunk rivet nut 1 is riveted to the workpiece 2, its head flange 11 does not obviously protrude from the workpiece 2 and can be interlocked with the workpiece 2 to play a good anti-slip role. Under the premise, it is easier to form and uses less material.

[0046] Specifically, in this embodiment, the number of the first anti-slip teeth 3 and the second anti-slip teeth 4 are both 36. Of course, in other embodiments, the number of the first anti-slip teeth 3 and the second anti-slip teeth 4 can also be set to other numbers according to the thickness specifications of the countersunk rivet nut 1.

[0047] See also Figures 1 to 3 Specifically, in this embodiment, the first anti-slip teeth 3 and the second anti-slip teeth 4 are equidistantly distributed along the circumference of the countersunk rivet nut 1, so that part of the material of the workpiece 2 can evenly flow into the gap between the first anti-slip teeth 3 and the second anti-slip teeth 4 and fit tightly with the countersunk rivet nut 1.

[0048] See also Figure 4 and Figure 5Specifically, the connection system disclosed in the present invention includes a workpiece 2, the countersunk rivet nut 1 as described above, and a structure, wherein a slotted hole 21 is provided on the workpiece 2; the portion of the expansion portion of the countersunk rivet nut 1 connected to the head flange 11 is interference-fitted into the slotted hole 21 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 riveted expansion protrusion 5, and the riveted expansion protrusion 5 cooperates with the head flange 11 to clamp the workpiece 2; the structure is detachably connected to the through-hole 13 of the countersunk rivet nut 1, and the structure is, for example, an external hexagonal bolt. Of course, in other embodiments, other rivet structures that can be detachably connected to the through-hole 13 of the countersunk rivet nut 1 can also be selected according to actual needs.

[0049] Specifically, in this embodiment, a plurality of first anti-slip teeth 3 are provided on the end surface of the rivet expansion protrusion 5 facing the workpiece 2, and a plurality of second anti-slip teeth 4 are provided on the countersunk wedge surface 111 of the head flange 11 facing the workpiece 2. The first anti-slip teeth 3 and the second anti-slip teeth 4 are both engaged with the workpiece 2, so that during the detachable connection between the structure and the countersunk rivet nut 1, the countersunk rivet nut 1 will not rotate relative to the workpiece 2. It should be understood that the plurality of first anti-slip teeth 3 provided on the end surface of the rivet expansion protrusion 5 facing the workpiece 2 have also undergone a certain deformation compared to before the rivet expansion protrusion 5 is formed (that is, they have a certain expansion outward synchronously with the formation of the rivet expansion protrusion 5).

[0050] 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 replacements for some of the technical features therein. Any changes, equivalent replacements, 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 countersunk 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; The end surface of the head flange facing the rod portion is a countersunk wedge surface, and the countersunk wedge surface is provided with a plurality of second anti-slip teeth along its circumference; the second anti-slip teeth are connected or disconnected with the first anti-slip teeth in a one-to-one correspondence; When riveting a workpiece, the rod portion can expand outward to form a riveting expansion protrusion to cooperate with the countersunk wedge surface of the head flange to clamp the workpiece, and the first anti-slip teeth and the second anti-slip teeth can both engage with the workpiece.

2. The countersunk 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 countersunk rivet nut is riveted to the workpiece. The riveting expansion protrusion can clamp the workpiece axially together with the head flange.

3. The countersunk rivet nut according to claim 2, 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.

4. The countersunk rivet nut according to claim 2, characterized in that: The countersunk rivet nut is provided with a through hole along the axial direction, and the through hole includes at least a first section hole and a second section hole arranged coaxially. The first section hole is closer to the end of the head flange away from the threaded section than the second section hole. The aperture of the first section hole is larger than the aperture of the second section hole, and an internal thread is formed on the inner side wall of the second section hole.

5. The countersunk rivet nut according to claim 4, characterized in that: The first section hole is axially arranged in the head flange and the expansion section; The second section hole is axially arranged in the threaded section.

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

7. The countersunk rivet nut according to claim 1, characterized in that: There are 36 first anti-slip teeth and 36 second anti-slip teeth.

8. The countersunk rivet nut according to claim 1, characterized in that: The first anti-slip teeth and the second anti-slip teeth are both equidistantly distributed along the circumference of the countersunk rivet nut.

9. A connection system, characterized in that: The connection system comprises: A workpiece, wherein a slot is formed on the workpiece; The countersunk 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 slotted 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 through hole of the countersunk rivet nut.

10. The connection system according to claim 9, characterized in that The end surface of the riveted expansion protrusion facing the workpiece is provided with a plurality of first anti-slip teeth, and the countersunk wedge surface of the head flange facing the workpiece is provided with a plurality of second anti-slip teeth. The first anti-slip teeth and the second anti-slip teeth are both engaged with the workpiece.

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