Rivet nut and connecting system

Abstract

The utility model provides a rivet nut and a connecting system, the provided rivet nut is used for riveting a workpiece, and the hardness of the rivet nut is smaller than that of the workpiece; the rivet nut comprises a head flange, and a first rod body and a second rod body which are sequentially arranged from one end of the head flange; wherein the cross sections of at least the first rod body, the second rod body and the riveting hole of the workpiece are circular; the diameter of the circumcircle of the cross section of the head flange and the outer diameter of the first rod body are both larger than the hole diameter of a riveting hole of a workpiece. The outer diameter of the second rod body is smaller than the aperture of a riveting hole of a workpiece; the first rod body comprises at least two rod bodies which are sequentially arranged in the axial direction, the outer diameter of each rod body is gradually reduced in the direction from the head flange to the second rod body, and the outer diameter of each rod body is gradually reduced in the direction from the head flange to the second rod body; and each rod body can form a deformation part which is in alignment interference fit with a riveting hole of a workpiece when the rod body is riveted into the workpiece.

Description

Technical Field

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

[0002] Commonly used riveted fasteners in the prior art include rivet nuts, screws, etc. For example, the sealed rivet nut disclosed in the patent application with application number CN202111405413.4 includes a rod body and a head flange, the head flange is a round head, the outer rod wall of the rod body is a smooth surface, and the rod body is deformed radially outward during the riveting process to abut against the plate, thereby achieving riveting and fastening of the plate, but it only has a riveting and fastening function and does not have an anti-rotation function. Specifically, during long-term use, due to mechanical vibration, wear, etc., the riveting often becomes loose, causing the riveted fastener to rotate or rotate relative to each other, which can lead to riveting failure.

[0003] In response to this, industry insiders have also made further innovations, mostly by setting tooth-shaped features on the outer rod wall near the head flange end of the rod body, so that when riveting the plate, it can be embedded in the plate to increase the torque, thus making the riveted fastener have an anti-rotation function. However, when the hardness of the plate to be riveted is higher than that of the riveted fastener, the tooth-shaped features will be squeezed and forced to flow during the riveting process of the riveted fastener and the plate, and fill the recess between the tooth-shaped features set on its own outer wall. Therefore, it can only be placed in the circular riveting hole of the plate instead of being embedded in the hole wall of the riveted hole. Therefore, in this case, a hexagonal hole will be processed on the plate, and at the same time, the outer wall of the riveted fastener will be processed into a hexagon, so that the riveted fastener can be fixed and anti-rotated through the cooperation of the hexagonal outer wall and the hexagonal hole. However, in actual processing, it is difficult and costly to process polygonal outer walls of riveted fasteners and matching polygonal holes on plates. At the same time, when performing riveting operations, it is also necessary to align the outer walls of the riveted fasteners with the riveted holes of corresponding shapes on the plates before proceeding. Otherwise, not only will the anti-rotation effect fail to be achieved, but the riveted fasteners and plates may be damaged, which is also not conducive to assembly efficiency. Utility Model Content

[0004] In view of the above-mentioned problems existing in the prior art, the main purpose of the utility model is to provide a rivet nut and a connection system. The provided rivet nut has low processing difficulty, is easy to operate when riveting workpieces, and has excellent anti-rotation performance after being riveted with the workpiece to form a connection system.

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

[0006] The utility model provides a rivet nut, which is used for riveting workpieces, wherein the hardness of the rivet nut is less than the hardness of the workpiece; the rivet nut comprises a head flange and a first rod body and a second rod body sequentially arranged at one end of the head flange; wherein:

[0007] At least the cross-sectional shapes of the first rod body, the second rod body and the riveting hole of the workpiece are all circular;

[0008] The diameter of the circumscribed circle of the cross section of the head flange and the outer diameter of the first rod body are both larger than the diameter of the riveting hole of the workpiece; the outer diameter of the second rod body is smaller than the diameter of the riveting hole of the workpiece;

[0009] The first rod body includes at least two rod bodies arranged in sequence along the axial direction, and the outer diameters of the rod bodies decrease one by one along the direction from the head flange toward the second rod body, and the outer diameter of each of the rod bodies gradually shrinks along the direction from the head flange toward the second rod body; each of the rod bodies can form a deformation portion that is aligned with the riveting hole of the workpiece for interference fit when riveted into the workpiece.

[0010] As a further description of the above technical solution, the ratio of the outer diameter of each rod body included in the first rod body to the hole diameter of the rivet hole matching part of the workpiece is 1.01-1.05.

[0011] As a further description of the above technical solution, the rivet nut is provided with a through hole along the axial direction, and the through hole 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 away from the second rod body than the second hole segment, the hole diameter of the first hole segment is larger than the hole diameter of the second hole segment, and an internal thread is formed on the inner side wall of the second hole segment.

[0012] As a further description of the above technical solution, the second rod body includes a third rod body and a fourth rod body arranged in sequence along the axial direction from the end thereof away from the head flange, and the outer diameters of the two rod bodies are the same;

[0013] The first hole section is axially arranged in the head flange, the first rod body and the fourth rod body;

[0014] The second hole section is axially arranged in the third rod body.

[0015] As a further description of the above technical solution, the fourth rod body can form a riveting expansion protrusion when the rivet nut is riveted to the workpiece, and the riveting expansion protrusion can clamp the workpiece axially together with the head flange.

[0016] As a further description of the above technical solution, the head flange, the first rod body and the second rod body of the rivet nut are connected in an integrated manner.

[0017] As a further description of the above technical solution, a connection between the head flange and the first rod body adopts a rounded corner or a non-rounded corner transition.

[0018] As a further description of the above technical solution, the cross-section of the head flange is circular or non-circular.

[0019] The utility model also provides a connection system, the connection system comprising:

[0020] A workpiece, wherein the workpiece is provided with a riveting hole having a circular cross section;

[0021] A blind rivet nut as described above;

[0022] When the first rod of the rivet nut is riveted into the riveting hole of the workpiece, a deformation portion formed by material flow is interference-fitted with the riveting hole;

[0023] The portion of the rivet nut where the fourth rod body is connected to the third rod body forms a riveted expansion protrusion under the action of tension, and the riveted expansion protrusion cooperates with the head flange to clamp the workpiece.

[0024] By means of the above technical solution, the outstanding effects of the utility model are:

[0025] 1. When the rivet nut of the utility model is used to rivet workpieces, a rivet tool (such as a rivet gun) can be used in the same manner as the installation of ordinary rivet nuts. After the second rod body passes through the rivet hole of the workpiece, the part of the second rod body adjacent to the first rod body is deformed and riveted in place, and the plate is pre-tightened in the axial direction of the rivet hole in cooperation with the head flange. Therefore, although the diameter of the first rod body is larger than the aperture of the rivet hole of the workpiece, the hardness of the rivet nut is smaller than the hardness of the workpiece. At the same time, the first rod body includes at least two rod bodies arranged in sequence along the axial direction, and the outer diameter of the rod body is along the head flange toward The direction of the second rod body is gradually reduced, and the outer diameter of each rod body is gradually reduced along the direction of the head flange toward the second rod body. Therefore, each rod body will be squeezed into the rivet hole one by one along the direction from the second rod body to the head flange due to the combined force of the workpiece and the rivet tool, and will be aligned with the rivet hole with interference fit. Therefore, when the cross-sectional shapes of the first rod body, the second rod body and the rivet hole of the workpiece are all circular, the torque of the rivet nut after being riveted into the workpiece can be increased, so that it has an anti-rotation function, which reduces the processing difficulty of the rivet nut and the workpiece, and also effectively improves the assembly efficiency;

[0026] 2. In the rivet nut provided by the utility model, the outer diameters of the rod bodies included in the first rod body decrease one by one along the direction from the head flange toward the second rod body, and the outer diameter of each rod body gradually shrinks along the direction from the head toward the flange, which also plays a guiding role in the process of riveting the rivet nut into the workpiece, and is conducive to the first rod body gradually squeezing into the riveting hole of the workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is an axial cross-sectional view of a rivet nut in an embodiment of the utility model;

[0028] Figure 2 for Figure 1 The enlarged view of point A in the middle;

[0029] Figure 3 A bottom view of a rivet nut in an embodiment of the utility model;

[0030] Figure 4 This is a schematic diagram of the structure of the connection system in the embodiment of the utility model;

[0031] Figure 5 for Figure 4 Enlarged view of point B in the middle.

[0032] Description of Figure Numbers:

[0033] 1. Rivet nut; 11. Head flange; 12. First rod body; 121. First rod body; 122. Second rod body; 13. Second rod body; 131. Third rod body; 132. Fourth rod body; 14. Deformation portion; 15. Through hole; 151. First hole section; 152. Second hole section; 16. Internal thread; 2. Workpiece; 21. Riveting hole; 3. Riveting expansion protrusion. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0035] In the description of the present utility model, it should be noted that the terms "upper", "middle", "lower", "inside", "outside", "front", "back", "left", "right" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, 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 utility model can be understood according to specific circumstances. The following describes the implementation method of the present utility model based on its overall structure.

[0036] See also Figures 1 to 5 The utility model discloses a rivet nut 1 and a connection system. The disclosed rivet nut 1 is used for riveting a workpiece 2. The hardness of the rivet nut 1 is less than the hardness of the workpiece 2. The rivet nut 1 includes a head flange 11 and a first rod body 12 and a second rod body 13 sequentially arranged at one end of the head flange 11.

[0037] At least the cross-sectional shapes of the first rod body 12, the second rod body 13 and the riveting hole 21 of the workpiece 2 are all circular;

[0038] The diameter of the circumscribed circle of the cross section of the head flange 11 and the outer diameter of the first rod body 12 are both larger than the diameter of the riveting hole 21 of the workpiece 2; the outer diameter of the second rod body 13 is smaller than the diameter of the riveting hole 21 of the workpiece 2;

[0039] The first rod body 12 includes at least two rod bodies arranged in sequence along the axial direction, and the outer diameters of the rod bodies decrease one by one along the direction from the head flange 11 to the second rod body 13, and the outer diameter of each of the rod bodies gradually shrinks along the direction from the head flange 11 to the second rod body 13; each of the rod bodies can form a deformation portion 14 that is interference fit with the rivet hole 21 of the workpiece 2 when riveted into the workpiece 2.

[0040] By means of the above structure, when the rivet nut 1 is used to rivet the workpiece 2, a rivet tool (such as a rivet gun) can be used in the same manner as the installation of an ordinary rivet nut 1, so that after the second rod 13 passes through the rivet hole 21 of the workpiece 2, the part of the second rod 13 adjacent to the first rod 12 is deformed and riveted into place, and the plate is pre-tightened along the axial direction of the rivet hole 21 in cooperation with the head flange 11. Therefore, although the diameter of the first rod 12 is larger than the aperture of the rivet hole 21 of the workpiece 2, the hardness of the rivet nut 1 is smaller than the hardness of the workpiece 2, and the first rod 12 includes at least two rod bodies arranged in sequence along the axial direction, and the outer diameter of the rod body is along the head flange 11 toward The directions of the second rod bodies 13 are gradually reduced, and the outer diameter of each of the rod bodies is gradually reduced along the head flange 11 toward the second rod body 13. Therefore, each rod body will be squeezed into the rivet hole 21 one by one along the direction from the second rod body 13 to the head flange 11 due to the combined force of the workpiece 2 and the rivet tool, and will be aligned with the rivet hole 21 with interference fit. Therefore, when the cross-sectional shapes of the first rod body 12, the second rod body 13 and the rivet hole 21 of the workpiece 2 are all circular, the torque of the rivet nut 1 after being riveted into the workpiece 2 can be increased, so that it has an anti-rotation function, which reduces the processing difficulty of the rivet nut 1 and the workpiece 2, and effectively improves the assembly efficiency. Among them, the outer diameters of the rod bodies included in the first rod body 12 decrease one by one along the direction from the head flange 11 to the second rod body 13, and the outer diameter of each rod body gradually shrinks along the direction from the head to the flange, which also plays a guiding role in the process of riveting the rivet nut 1 into the workpiece 2, which is conducive to the first rod body 12 gradually squeezing into the riveting hole 21 of the workpiece 2.

[0041] See also Figures 1 to 3 Specifically, in this embodiment, the rivet nut 1 includes a head flange 11 and a first rod body 12 and a second rod body 13 with a circular cross section arranged in sequence downward from the lower end of the head flange 11, wherein the first rod body 12 includes a first rod body 121 and a second rod body 122 arranged in sequence from top to bottom, and the outer diameters of the two rod bodies decrease one by one along the direction from the head flange 11 to the second rod body 13, and the outer diameter of each of the rod bodies gradually decreases along the direction from the head flange 11 to the second rod body 13, so as to play a guiding role in the process of riveting the rivet nut 1 into the workpiece 2, which is conducive to the first rod body 12 gradually squeezing into the riveting hole 21 of the workpiece 2. Of course, in other embodiments, the first rod body 12 of the rivet nut 1 may also include more rod bodies, but it should be understood that the outer diameters of the plurality of rod bodies decrease one by one along the direction from the head flange 11 to the second rod body 13, and the outer diameter of each of the rod bodies gradually decreases along the direction from the head flange 11 to the second rod body 13.

[0042] Specifically, in this embodiment, the ratio of the outer diameter of the first rod body 121 and the second rod body 122 included in the first rod body 12 to the aperture of the aligning and adapting portion of the rivet hole 21 of the workpiece 2 is 1.03, so that after the first rod body 12 is riveted into the workpiece 2, the first rod body 121 and the second rod body 122 can be aligned with the force flow, thereby forming a deformation portion 14 that is aligned with the rivet hole 21 of the workpiece 2 with interference fit, so that the rivet nut 1 will not rotate relative to the workpiece 2 in the circumferential direction after riveting. Of course, in other embodiments, the ratio of the outer diameter of the multiple rod bodies included in the first rod body 12 to the aperture of the aligning and adapting portion of the rivet hole 21 of the workpiece 2 can also be set to other values ​​between 1.01-1.05.

[0043] See also Figure 1 to Figure 2 Specifically, in this embodiment, the rivet nut 1 is provided with a through hole 15 in the vertical direction, and the through hole 15 includes a first hole segment 151 and a second hole segment 152 which are coaxially arranged. The first hole segment 151 is closer to the upper end of the head flange 11 than the second hole segment 152. The aperture of the first hole segment 151 is larger than that of the second hole segment 152. An internal thread 16 is formed on the inner side wall of the second hole segment 152 so that a fastener adapted thereto can be installed therein.

[0044] See also Figure 1 Specifically, in this embodiment, the second rod body 13 includes a third rod body 131 and a fourth rod body 132 arranged in sequence along the vertical direction from its lower end, and the two rod bodies have the same outer diameter; the first hole section 151 is axially arranged in the head flange 11, the first rod body 12 and the fourth rod body 132; the second hole section 152 is axially arranged in the third rod body 131. Therefore, the wall thickness between the outer rod wall of the fourth rod body 132 and the inner wall of the hole of the first hole section 151 is smaller than the wall thickness between the rod outer wall of the third rod body 131 and the inner wall of the hole of the second hole section 152 and the wall thickness between the rod outer wall of the first rod body 12 and the inner wall of the hole of the first hole section 151, so that it is convenient to change the outer shape into the riveting expansion protrusion 3 during the riveting process, so as to be clamped on the lower end surface and the upper end surface of the workpiece 2 with the head flange 11 respectively, and realize the pre-tightening of the workpiece 2 in the vertical direction. More specifically, during the riveting process, the fourth rod body 132 is not completely deformed outward to form a riveted expansion protrusion 3, but its lower half connected to the third rod body 131 is deformed into a riveted expansion protrusion 3, and its upper half connected to the first rod body 12 can be riveted in the riveting hole 21 of the workpiece 2.

[0045] Specifically, in this embodiment, the head flange 11, the first rod body 12 and the second rod body 13 of the rivet nut 1 are connected in an integral manner, and can be directly formed by cold heading and then tapped to form the internal thread 16 of the internal second hole section 152.

[0046] Specifically, in this embodiment, a rounded transition is used at the connection between the head flange 11 and the first rod body 12. Of course, in other embodiments, a non-rounded transition may also be used at the connection between the head flange 11 and the first rod body 12.

[0047] Specifically, in this embodiment, the cross section of the head flange 11 is circular. Of course, in other embodiments, according to actual needs, the cross section of the head flange 11 may also be non-circular.

[0048] See also Figures 4 to 5 Specifically, the connection system disclosed in this embodiment includes: a workpiece 2, on which is provided a rivet hole 21 with a circular cross-section and the rivet nut 1 as described above; when the first rod body 12 of the rivet nut 1 is riveted into the rivet hole 21 of the workpiece 2, the material flows to form a deformation portion 14 that is interference fit with the rivet hole 21. In other words, during the riveting process, the first rod body 12 of the rivet nut 1 is gradually squeezed into the rivet hole 21 to generate a preload force, so that after the riveting is completed, the rivet nut 1 and the workpiece 2 will not rotate relative to each other in the circumferential direction to increase the torque; at the same time, the lower half of the fourth rod body 132 of the rivet nut 1 connected to the third rod body 131 forms a rivet expansion protrusion 3 outwardly under the action of tension, and the rivet expansion protrusion 3 cooperates with the head flange 11 to be clamped on the lower end surface and the upper end surface of the workpiece 2 respectively, thereby preloading the workpiece 2 in the vertical direction.

[0049] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not limited to the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to 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 shall be included in the protection scope of the present invention.

Claims

1. A rivet nut, used for riveting workpieces, characterized in that: The hardness of the rivet nut is less than the hardness of the workpiece; the rivet nut comprises a head flange and a first rod body and a second rod body sequentially arranged from one end of the head flange; wherein, At least the cross-sectional shapes of the first rod body, the second rod body and the riveting hole of the workpiece are all circular; The diameter of the circumscribed circle of the cross section of the head flange and the outer diameter of the first rod body are both larger than the diameter of the riveting hole of the workpiece; the outer diameter of the second rod body is smaller than the diameter of the riveting hole of the workpiece; The first rod body includes at least two rod bodies arranged in sequence along the axial direction, and the outer diameters of the rod bodies decrease one by one along the direction from the head flange toward the second rod body, and the outer diameter of each of the rod bodies gradually shrinks along the direction from the head flange toward the second rod body; each of the rod bodies can form a deformation portion that is aligned with the riveting hole of the workpiece for interference fit when riveted into the workpiece.

2. The rivet nut according to claim 1, characterized in that: The ratio of the outer diameter of each rod body included in the first rod body to the hole diameter of the rivet hole matching part of the workpiece is 1.01-1.

05.

3. The rivet nut according to claim 1, characterized in that: The rivet nut is provided with a through hole along the axial direction, and the through hole includes at least a first hole segment and a second hole segment which are coaxially arranged. The first hole segment is closer to the end of the head flange which is away from the second rod body than the second hole segment. The hole diameter of the first hole segment is larger than the hole diameter of the second hole segment, and an internal thread is formed on the inner side wall of the second hole segment.

4. The rivet nut according to claim 3, characterized in that: The second rod body includes a third rod body and a fourth rod body which are sequentially arranged along the axial direction from the end thereof away from the head flange, and the outer diameters of the two rod bodies are the same; The first hole section is axially arranged in the head flange, the first rod body and the fourth rod body; The second hole section is axially arranged in the third rod body.

5. The rivet nut according to claim 4, characterized in that: The fourth rod body can form a riveting expansion protrusion when the rivet nut is riveted to the workpiece, and the riveting expansion protrusion can clamp the workpiece axially together with the head flange.

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

7. The rivet nut according to claim 1, characterized in that: A connection between the head flange and the first rod body adopts a rounded corner or a non-rounded corner transition.

8. The rivet nut according to claim 1, characterized in that: The cross section of the head flange is circular or non-circular.

9. A connection system, characterized in that: The connection system comprises: A workpiece, wherein the workpiece is provided with a riveting hole having a circular cross section; The rivet nut according to any one of claims 1 to 8; When the first rod of the rivet nut is riveted into the riveting hole of the workpiece, a deformed portion formed by material flow is interference-fitted with the riveting hole; The portion of the rivet nut where the fourth rod body is connected to the third rod body forms a riveted expansion protrusion under the action of tension, and the riveted expansion protrusion cooperates with the head flange to clamp the workpiece.

Images