Countersunk head rivet nut with special head shape and spline tooth structure

Abstract

The utility model provides a countersunk head rivet nut with a special head shape and a spline tooth structure. The countersunk head rivet nut comprises a rivet nut body. The countersunk head connecting flange is integrally arranged at the top of the rivet nut body, the circumference of the bottom of the countersunk head connecting flange is of a conical structure, after installation, the countersunk head connecting flange is clamped into a sheet metal part, and the top of the countersunk head connecting flange is flush with the sheet metal part; a mounting opening is formed in the countersunk head connecting flange and is communicated with the inner hole; and head lower spline teeth are integrally arranged at the joint of the countersunk head connecting flange and the rivet nut body towards the outer side surface, and are clamped into the matched sheet metal part. The countersunk head connecting flange is arranged on the rivet nut body, the height of the head is flush with that of a plate after installation is completed, the countersunk head connecting flange is of a kidney-shaped structure, rapid butt joint and rotation prevention are achieved, and the lower-head spline teeth are arranged at the connecting position of the countersunk head connecting flange and the rivet nut body, so that the rivet nut is convenient to assemble and disassemble. By means of the under-head spline teeth, the guiding and accurate alignment effects are achieved, and the reinforcing and locking effects can be achieved when the rivet is pressed into a riveted object.

Description

Technical Field

[0001] The utility model relates to the field of automobile parts, in particular to the technical field of rivet nuts, and specifically relates to a countersunk rivet nut with a special head shape and a tooth structure. Background Art

[0002] Pull rivet nuts are widely used in automotive parts and other fields. When rivet nuts are riveted, they can ensure the stability and safety of various automotive parts, tightly connect metal sheets or sheet metal, and provide high-strength connection effects. Conventional countersunk pull rivet nuts can be widely used because their tops are flush with sheet metal after installation. However, after installation, it is found that there are the following problems:

[0003] (1) When the pull rivet nut adopts a conventional cylindrical structure, since the body and the head are both round, the round rivet nut is prone to relative rotation with the butted metal sheet or sheet metal during use, and after riveting, a structure to prevent rotation cannot be formed, resulting in a loose connection between the nut and the metal sheet or sheet metal, thereby reducing the connection strength;

[0004] (2) After installation, the head structure is larger than the body, and it is impossible to accurately align the body parts, resulting in a gap between the part body and the installation plate. Once the hole opening accuracy of the sheet metal is not high, the installation position of the rivet nut will deviate. In severe cases, it will cause local deformation of the surrounding structure, directly affecting the connection strength.

[0005] The prior art discloses a countersunk rivet nut for automobiles, with announcement number CN210565663U, which discloses a countersunk rivet nut for automobiles, characterized in that it includes a first nut column, a second nut column, a fastening bar tooth and a nut head, a nut head is provided above the first nut column, a plurality of fastening bar teeth are provided on the outer side wall of the first nut column, a second nut column is provided below the first nut column, a first screw hole is provided inside the first nut column, a second screw hole is provided inside the second nut column, and the first screw hole and the second screw hole are mutually connected. Compared with the prior art, the countersunk rivet nut for automobiles provided by the utility model has a reasonable structure. By providing a plurality of fastening bar teeth and a plurality of second fastening bar teeth on the first nut column, the fastening bar teeth and the second fastening bar teeth can perform secondary fastening on the rivet nut during the riveting process, thereby avoiding loosening or even falling off caused by vibration during the use of the automobile. Although the countersunk structure of the rivet nut is disclosed, the waist-shaped structure of the head is not disclosed; and the structure of the teeth under the head is not disclosed either.

[0006] A new type of countersunk hexagonal rivet nut is disclosed in the prior art, with announcement number CN219639228U, which discloses a new type of countersunk hexagonal rivet nut. A hexagonal through hole is opened on the plate, and a circular chamfer is arranged on the upper end of the hexagonal through hole, including: a nut body, which is hexagonal; a countersunk structure, which is arranged on the upper end of the nut body, and a circular countersunk is arranged on the countersunk structure. The circular countersunk is provided with a countersunk wedge surface connected to the upper end of the nut body, and the countersunk wedge surface is matched with the circular chamfer. When the nut body passes through the hexagonal through hole, the circular countersunk can sink into the circular chamfer through the countersunk wedge surface, so that the upper end surface of the circular countersunk is flush with the surface of the plate. Compared with the prior art, the advantage of the utility model is that the countersunk head can be completely placed in the circular chamfer so that the upper end face of the rivet nut is flush with the surface of the plate, avoiding the situation of protruding from the surface of the plate, better realizing zero-gap fit between products, and the matching circular chamfer can avoid milling and thus reduce processing costs. Although the countersunk head structure of the rivet nut is disclosed, the waist-shaped structure of the head is not disclosed, and the structural feature of being flush with the surface after installation with the matching mounting hole is also disclosed; and the structure of the teeth under the head is also not disclosed.

[0007] A torque-enhanced waterproof riveted nut is disclosed in the prior art. The announcement number CN213298549U discloses a torque-enhanced waterproof riveted nut, which belongs to the field of mechanical technology. It includes: a nut seat, a nut body, a blind hole, a rib, and a waterproof glue; the first end of the nut body is connected to the nut seat, and the second end of the nut body is a closed structure; the ribs are distributed circumferentially along the connection between the nut body and the nut seat; the waterproof glue is applied to the connection between the nut body and the nut seat, and the ribs are wrapped in the waterproof glue, and the blind hole is arranged in the nut body and passes through the nut seat. The utility model torque-enhanced waterproof riveted nut is provided with ribs, and the ribs extend from one end of the nut body to the nut seat and the cross-sectional area along the radial direction gradually decreases. When connecting the fixed workpiece, the ribs will be embedded in the fixed workpiece, greatly increasing the anti-rotation torque of the fixed workpiece; at the same time, the waterproof glue plays a waterproof role. Although the head lower tooth structure is disclosed, the head lower tooth is consistent with the head structure in length; and the countersunk structure of the rivet nut is not disclosed. Summary of the invention

[0008] In view of the above-mentioned shortcomings of the prior art, the purpose of the utility model is to provide a countersunk rivet nut with a special head shape and a tooth structure, so as to solve the difficulties of the prior art.

[0009] In order to achieve the above-mentioned purpose and other related purposes, the utility model provides a countersunk rivet nut with a special head shape and a tooth structure, comprising:

[0010] A rivet nut body 1, wherein an inner hole 2 is formed in the rivet nut body 1;

[0011] The countersunk connecting flange 3 is integrally arranged on the top of the rivet nut body 1, and the bottom circumference of the countersunk connecting flange 3 is a conical structure. After installation, it is inserted into the sheet metal part, and the top of the countersunk connecting flange 3 is flush with the sheet metal part;

[0012] An installation opening 4 is provided in the countersunk connecting flange 3, and the installation opening 4 is communicated with the inner hole 2;

[0013] The lower head flower teeth 5 are integrally provided with the lower head flower teeth 5 facing the outer side surface at the connection point of the countersunk connecting flange 3 and the rivet nut body 1. When installing, the lower head flower teeth 5 are inserted into the matching sheet metal parts.

[0014] Furthermore, a plurality of under-head flower teeth 5 are provided, and the plurality of under-head flower teeth 5 are arranged in a ring array at the bottom of the countersunk connecting flange 3 .

[0015] In the present technical solution, the rivet nut body 1 and the countersunk connecting flange 3 are utilized to achieve the effect that the countersunk connecting flange 3 is flush with the top of the sheet metal after riveting, and a plurality of under-head teeth 5 are provided at the connection between the countersunk connecting flange 3 and the rivet nut body 1. As the countersunk rivet nut moves toward the sheet metal connection direction, the under-head teeth 5 not only play a guiding role, but also can be clamped into the sheet metal after installation, so as to ensure the installation position is accurate and can be more easily pressed into the riveted object to obtain the effect of reinforcement and locking.

[0016] According to the preferred embodiment, the countersunk connecting flange 3 is integrally provided with a flange head 31 and a connecting end 32 along a direction close to the rivet nut body 1;

[0017] The flange head 31 is provided in a waist-shaped structure and is opened to the lower connecting end 32. The waist-shaped structure of the flange head 31 includes arc-shaped structures 33 on both sides and a straight-line structure 34 located between the arc-shaped structures 33 on both sides.

[0018] The connecting end 32 is arranged in an inverted conical structure, and the bottom is connected to the rivet nut body 1 .

[0019] Furthermore, the connection holes on the matching sheet metal parts are also arranged in a waist-shaped structure.

[0020] In the present technical solution, since the head structure of a conventional rivet nut is usually a circular structure, and the connecting hole on the matching sheet metal is also circular, the anti-rotation effect cannot be achieved after the two are matched and installed, which will lead to the risk of loosening of the rivet nut after riveting. For this reason, the countersunk connecting flange 3 with a waist-shaped structure can not only achieve faster matching and installation with the sheet metal, improve riveting efficiency, and reduce installation time, but also form a precise alignment contact between the countersunk connecting flange 3 and the sheet metal, and can form a good fit with the installation surface, thereby increasing friction. This increased friction can effectively prevent the countersunk rivet nut from rotating when subjected to external force.

[0021] According to the preferred embodiment, the outer diameter of the countersunk connecting flange 3 is D1, and the straight length between the linear structures 34 on the two opposite sides is H;

[0022] Among them, 0.95≥H / D1≥0.80.

[0023] In the present technical solution, the waist-shaped structure of the countersunk connecting flange 3 is limited in size. Since the head structure of conventional rivet nuts in the prior art is mostly a circular structure, when the outer shape structure of the countersunk connecting flange 3 is similar to the circular structure, it cannot achieve the anti-rotation effect. If H / D1 is too large and the head is too close to a circle, the problem of following rotation is likely to occur during the tightening process of the rivet nut.

[0024] In practice, it is found that when H / D1 is too small, other problems may arise:

[0025] When H / D1 is too small, the head area is small, which affects the head connection strength of the rivet nut;

[0026] When H / D1 is too small, the surface area of ​​the head region is small, the friction force is reduced, and the torque during the bolt assembly process is reduced;

[0027] When H / D1 is too small, the straight edge of the waist is too close to the body diameter, which can easily cause scratches on the body and increase production difficulties.

[0028] According to a preferred embodiment, a knurling structure 6 is further provided on the outer circumference of the rivet nut body 1 , and the top of the knurling structure 6 is not higher than the bottom of the lower tooth 5 .

[0029] Furthermore, the knurling structure 6 adopts vertical knurling.

[0030] In the present technical solution, the friction between the rivet nut body 1 and the mating structural member can be increased by the vertical knurling treatment on the rivet nut body 1, which is beneficial to the stability between the two after installation. The vertical knurling can also form a tighter connection between the rivet nut body 1 and the mating structural member, reduce the risk of loosening, and improve the stability of the connection. The increased friction helps to improve the strength and stability of the connection, and reduces the risk of loosening or breaking of the countersunk rivet nut due to vibration or external force.

[0031] According to the preferred embodiment, the top of the lower head flower teeth 5 is integrally connected to the connection end 32 of the countersunk connecting flange 3, and the bottom of the lower head flower teeth 5 is integrally connected to the outer circumference of the rivet nut body 1;

[0032] The lower head tooth 5 is arranged in an inclined shape on a side away from the rivet nut body 1 .

[0033] Furthermore, the top outer diameter of the lower head flower tooth 5 is greater than the bottom outer diameter.

[0034] In this technical solution, the structure of the lower head flower teeth 5 is used to press the nut into the preset hole of the sheet metal by external force. When the lower head flower teeth 5 are pressed into the sheet metal hole, the surrounding of the hole will be gradually squeezed, and the lower head flower teeth 5 are pressed into the sheet metal, thereby achieving a locking effect. This locking method ensures a firm connection between the nut and the plate;

[0035] In addition, since the diameter of the preset hole in the sheet metal is slightly larger than the lower size of the head tooth 5 and smaller than the upper size of the head tooth 5, the sheet metal will undergo plastic deformation under the pressure of the tooth, and the plastic deformation will form a guide groove structure, allowing the countersunk rivet nut to move along the direction of the guide groove, thereby forming a precise alignment installation connection.

[0036] According to the preferred embodiment, the transverse length of the lower head tooth 5 is L1, and the width between the side of the rivet nut body 1 and the side of the countersunk connecting flange 3 is L3;

[0037] Among them, L1 / L3≤0.7.

[0038] Furthermore, the outer diameter of the top of the lower head tooth 5 is smaller than the outer diameter of the countersunk connecting flange 3 .

[0039] In the present technical solution, the top of the lower head flower teeth 5 does not need to extend to the edge of the head of the countersunk connecting flange 3. When the lateral dimension of the lower head flower teeth 5 is too large, it will be difficult to press the lower head flower teeth 5 into the riveted object during the riveting process due to the excessive width of the lower head flower teeth 5. Once the lower head flower teeth 5 are not pressed into the riveted object, they will not play a reinforcing and locking role.

[0040] In addition, the width of the flower teeth 5 under the head is too large, and the processing of the flower teeth requires multi-station molding, which increases the difficulty of processing, and the tooth breakage phenomenon is prone to occur during the molding process, resulting in reduced connection quality.

[0041] According to a preferred embodiment, the bottom outer diameter of the lower head flower tooth 5 is smaller than the diameter of the opening on the sheet metal component, and the top outer diameter of the lower head flower tooth 5 is larger than the diameter of the opening on the sheet metal component.

[0042] In the present technical solution, the cross-section of the tooth of the lower head tooth 5 provided in the present embodiment is equivalent to a long chamfer. When not installed, the lower diameter of the lower head tooth 5 is smaller than the diameter of the opening, which is conducive to the smooth entry of the part into the installation hole of the sheet metal. For this reason, when the angle A is set to be relatively small, between 10°-25°, a guiding effect is formed to ensure the accuracy of the installation position.

[0043] According to the preferred embodiment, the length of the lower head tooth 5 on the rivet nut body 1 is L2;

[0044] Where L2>L1;

[0045] The angle between the inclined surface of the lower head tooth 5 and the side surface of the rivet nut body 1 is A;

[0046] Among them, 25°≥A≥10°.

[0047] In the technical solution, during the installation process, due to the setting of the above angle, the flower teeth 5 under the head can be designed as a long strip, and the flower teeth are smaller and sharper, which can make the countersunk rivet nut easier to press into the riveted object, and can also help to strengthen the locking effect with the sheet metal;

[0048] Furthermore, the inclined structure of the lower flower teeth 5 of the head makes the lower part have a guiding function, so that accurate positioning can be achieved when the installation hole opening accuracy is not high, thereby ensuring the effect of accurate installation position.

[0049] According to a preferred embodiment, the width of the lower head teeth 5 gradually increases along the direction approaching the countersunk rivet nut.

[0050] In the technical solution, the lower head flower teeth 5 are similar to a pyramidal structure, and do not adopt a flower tooth structure with the same thickness, so that the lower head flower teeth 5 can have a certain thickness and strength, so that when the lower head flower teeth 5 are pressed into the preset hole of the sheet metal, a larger contact area can be formed, which increases the friction between the lower head flower teeth 5 and the sheet metal, thereby enhancing the locking effect;

[0051] At the same time, when the head lower teeth 5 are subjected to circumferential pressure, they can disperse stress more effectively, avoid damage caused by stress concentration, and further improve the durability and safety of the connection;

[0052] In addition, the pyramid-shaped structure of the lower head flower teeth 5 fits more closely with the preset hole, which can provide more accurate guidance during the pressing process, helping to ensure that the lower head flower teeth 5 enter the preset hole smoothly and orderly, forming a stable connection and ensuring the effect of precise alignment.

[0053] According to a preferred embodiment, the inner hole 2 in the rivet nut body 1 is a blind hole or a through hole structure.

[0054] In the present technical solution, during use, according to the sealing requirements of the product, no sealing structure is required at the bottom of the rivet nut body 1, and the inner hole 2 adopts a through hole. If waterproofing or smoke prevention is required to penetrate from the bottom of the rivet nut body 1, a rivet nut body 1 with a blind hole structure will be preferably selected.

[0055] The utility model has the following beneficial effects:

[0056] (1) The rivet nut body 1 is equipped with a countersunk connecting flange 3 so that the head height is the same as the plate after installation;

[0057] (2) Secondly, the countersunk connecting flange 3 adopts a waist-shaped structure to achieve the effect of quick docking and anti-rotation;

[0058] (3) A plurality of under-head teeth 5 are provided at the connection between the countersunk connecting flange 3 and the rivet nut body 1. The under-head teeth 5 not only play a guiding and precise positioning role, but also can achieve a reinforcing locking effect when pressed into the riveted object.

[0059] The best embodiment of the present invention will be described in more detail below in conjunction with the accompanying drawings so that the features and advantages of the present invention can be easily understood. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] Figure 1 The display is a schematic diagram of the structure of the utility model;

[0061] Figure 2 The display is a three-dimensional structural schematic diagram of the utility model;

[0062] Figure 3 Shown is a bottom view of the utility model;

[0063] Figure 4 Displayed as the utility model Figure 1 A magnified schematic diagram of the local structure;

[0064] Figure 5 Shown is a schematic diagram of matching sheet metal in the utility model;

[0065] Figure 6 The figure shows the use state of the utility model before riveting;

[0066] Figure 7 The figure shows the use state of the utility model after riveting;

[0067] Description of symbols

[0068] 1. Rivet nut body;

[0069] 2. Inner hole;

[0070] 3. Countersunk flange connection,

[0071] 31. Flange head,

[0072] 32. Connection terminal,

[0073] 33. Arc structure,

[0074] 34. Linear structure;

[0075] 4. Install the opening;

[0076] 5. Flower teeth under the head;

[0077] 6. Knurling structure;

[0078] L1, transverse length of the subcapital flower teeth;

[0079] L2, the length of the lower teeth on the rivet nut body;

[0080] L3, the width from the side of the rivet nut body to the side of the countersunk connecting flange is;

[0081] A. The angle between the bevel of the tooth under the head and the side of the rivet nut body. DETAILED DESCRIPTION

[0082] In order to make the purpose, technical solution and advantages of the technical solution of the utility model clearer, the technical solution of the embodiment of the utility model will be clearly and completely described in conjunction with the drawings of the specific embodiments of the utility model. The same figure marks in the drawings represent the same parts. It should be noted that the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the described embodiments of 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.

[0083] Compared with the embodiments shown in the drawings, feasible implementations within the scope of protection of the present invention may have fewer components, other components not shown in the drawings, different components, differently arranged components, or differently connected components, etc. In addition, two or more components in the drawings may be implemented in a single component, or a single component shown in the drawings may be implemented as multiple separate components.

[0084] Unless otherwise defined, the technical terms or scientific terms used herein shall have the usual meanings understood by persons with ordinary skills in the field to which the utility model belongs. The words "first", "second" and similar words used in the specification and claims of the utility model patent application do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "one" do not necessarily indicate quantity restrictions. Words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0085] The utility model provides a countersunk rivet nut with a special head shape and a tooth structure, which is used in the design process of the countersunk rivet nut. The utility model does not limit the type of sheet metal parts, but the structure of the countersunk rivet nut with a special head shape and a tooth structure is particularly suitable for the connection requirements of automobile sheet metal parts.

[0086] In general, the countersunk rivet nut with a special head shape and tooth structure proposed in the utility model mainly includes a rivet nut body 1, a countersunk connecting flange 3, an installation opening 4, and a tooth under the head 5. Figure 1 , which shows the arrangement relationship of the rivet nut body 1, the countersunk connecting flange 3, the mounting opening 4, and the under-head flower teeth 5.

[0087] In order to achieve the purpose of precise positioning and installation of rivet nuts and avoid rotation after installation, the problem of using conventional cylindrical structure for rivet nuts in the background technology is solved. Since both the body and the head are round, the round rivet nut is prone to relative rotation with the docking metal sheet or sheet metal during use, and no structure to prevent rotation can be formed after riveting, resulting in loose connection between the nut and the metal sheet or sheet metal, thereby reducing the connection strength; after installation, the head structure is larger than the body, and precise positioning of the body part cannot be achieved, resulting in a gap between the part body and the installation plate. Once the hole opening accuracy of the sheet metal is not high, the rivet nut installation position deviation will occur, and in severe cases it will cause local deformation of the surrounding structure, directly affecting the connection strength.

[0088] To this end, in the technical solution provided in this embodiment, a countersunk connecting flange 3 is provided on the rivet nut body 1, so that the head height can be as flat as the plate after installation. Secondly, the countersunk connecting flange 3 adopts a waist-shaped structure to achieve the effects of quick docking and anti-rotation, and a plurality of under-head teeth 5 are provided at the connection between the countersunk connecting flange 3 and the rivet nut body 1. The under-head teeth 5 not only play the role of guidance and precise alignment, but also can obtain the effect of reinforcement and locking in the pressed riveted object.

[0089] In terms of overall structure, the countersunk rivet nut provided in this embodiment is integrally provided with a countersunk connecting flange 3 and a rivet nut body 1 along the axial direction, wherein a mounting opening 4 is provided in the countersunk connecting flange 3, and an inner hole 2 connected to the mounting opening 4 is provided in the rivet nut body 1, so as to facilitate the axial insertion of a rivet gun or other riveting tool to facilitate forming connection.

[0090] In addition, the inner hole 2 in the rivet nut body 1 is not limited to a blind hole or a through hole structure. During use, according to the sealing requirements of the product, no sealing structure is required at the bottom of the rivet nut body 1, and the inner hole 2 is a through hole. If waterproofing or smoke prevention is required to penetrate from the bottom of the rivet nut body 1, a rivet nut body 1 with a blind hole structure will be preferably selected.

[0091] As described above, in this embodiment, in order to achieve the effect that the surface of the countersunk rivet nut is flush with the upper surface of the sheet metal after being installed with the matching sheet metal, the bottom circumference of the countersunk connecting flange 3 is formed into a conical structure. After use and installation, when the countersunk rivet nut is inserted into the sheet metal, the top of the countersunk connecting flange 3 is set flush with the sheet metal.

[0092] Specifically, the countersunk connecting flange 3 is integrally provided with a flange head 31 and a connecting end 32 along the direction close to the rivet nut body 1. The flange head 31 is arranged in a waist-shaped structure and is opened to the connecting end 32 below. The connecting end 32 is arranged in an inverted conical structure, and the bottom is connected to the rivet nut body 1. During installation, the connecting end 32 of the conical structure is embedded in the connecting hole of the matching sheet metal part which is also arranged in a waist-shaped structure, so that mutual interlocking installation can be achieved, so that the countersunk connecting flange 3 can be flush with the top of the sheet metal part after riveting.

[0093] like Figure 2 and 3As shown, the waist-shaped structure of the flange head 31 includes arc structures 33 on both sides and a straight structure 34 located between the arc structures 33 on both sides. It is different from the conventional rivet nut in the prior art, which is usually a circular structure in the head structure and the connecting hole on the matching sheet metal is also a circular structure, so as to avoid the inability to achieve the anti-rotation effect after the two are matched and installed, and to avoid the risk of loosening of the rivet nut after riveting. Therefore, the countersunk connecting flange 3 with the waist-shaped structure can not only achieve faster matching and installation with the sheet metal, improve riveting efficiency, and reduce installation time, but also form a precise alignment contact between the countersunk connecting flange 3 and the sheet metal, and can form a good fit with the installation surface, thereby increasing the friction. The increased friction can effectively prevent the countersunk rivet nut from rotating when subjected to external force.

[0094] On this basis, considering that the waist-shaped countersunk rivet nut has sufficient anti-rotation ability and sufficient connection strength after installation and matching, the waist-shaped structure of the countersunk connecting flange 3 is limited in size, the outer diameter of the countersunk connecting flange 3 is D1, and the straight length between the straight structures 34 on the two opposite sides is H;

[0095] Among them, 0.95≥H / D1≥0.80;

[0096] Since the head structure of conventional rivet nuts in the prior art is mostly a circular structure, when the outer shape structure of the countersunk connecting flange 3 is similar to the circular structure, the anti-rotation effect cannot be achieved. If H / D1 is too large, the head is too close to a circle, and the problem of following rotation is likely to occur during the tightening process of the rivet nut;

[0097] In practice, it is found that when H / D1 is too small, other problems may arise:

[0098] When H / D1 is too small, the head area is small, which affects the head connection strength of the rivet nut;

[0099] When H / D1 is too small, the surface area of ​​the head region is small, the friction force is reduced, and the torque during the bolt assembly process is reduced;

[0100] When H / D1 is too small, the straight edge of the waist is too close to the body diameter, which can easily cause scratches on the body and increase production difficulties.

[0101] Then, if Figure 1As shown, a knurling structure 6 is further provided on the outer circumference of the rivet nut body 1, wherein the top of the knurling structure 6 is not higher than the bottom of the flower teeth 5 under the head. At the same time, the knurling structure 6 is also the area where the countersunk rivet nut is deformed during installation and use. The knurling structure 6 preferably adopts vertical knurling. The vertical knurling treatment on the rivet nut body 1 can increase the friction between the rivet nut body 1 and the matching structural member, which is beneficial to the stability between the two after installation. The vertical knurling can also form a tighter connection between the rivet nut body 1 and the matching structural member, reduce the risk of loosening, and improve the stability of the connection. The increased friction helps to improve the strength and stability of the connection, and reduces the risk of loosening or breaking of the countersunk rivet nut due to vibration or external force.

[0102] As mentioned above, a plurality of under-head teeth 5 are provided at the connection between the countersunk connecting flange 3 and the rivet nut body 1. During installation, as the countersunk rivet nut moves toward the sheet metal connection direction, the under-head teeth 5 not only play a guiding role, but also can be used to insert the under-head teeth 5 into the sheet metal after installation, thereby ensuring the accurate installation position and being able to be more easily pressed into the riveted object to obtain the effect of reinforcement and locking.

[0103] As shown in the figure, there are multiple lower head teeth 5, and the multiple lower head teeth 5 are arranged in a circular array at the bottom of the countersunk connecting flange 3. Specifically, the top of the lower head teeth 5 is integrally connected to the connecting end 32 of the countersunk connecting flange 3, and the bottom of the lower head teeth 5 is integrally connected to the outer circumference of the rivet nut body 1. From a structural point of view, the lower head teeth 5 are arranged in an inclined shape on the side away from the rivet nut body 1. Through the structure of the lower head teeth 5, it is possible to press it into the preset hole of the sheet metal by external force. When the lower head teeth 5 are pressed into the sheet metal hole, the surrounding of the hole will be gradually squeezed, and at the same time, the lower head teeth 5 are pressed into the sheet metal, thereby achieving a locking effect. This locking method ensures a firm connection between the nut and the plate;

[0104] In addition, the top outer diameter of the lower head tooth 5 is larger than the bottom outer diameter, that is, the top of the lower head tooth 5 will not contact the edge of the countersunk connecting flange 3. Since the diameter of the preset hole of the sheet metal is slightly larger than the size of the lower head tooth 5 and smaller than the upper size of the lower head tooth 5, the plate will undergo plastic deformation under the pressure of the tooth, and the plastic deformation will form a guide groove structure, so that the countersunk rivet nut moves along the direction of the guide groove, thereby forming a precise alignment installation connection.

[0105] As mentioned above, the top of the lower head flower teeth 5 does not need to extend to the edge of the head of the countersunk connecting flange 3. When the lateral dimension of the lower head flower teeth 5 is too large, it will be difficult to press the lower head flower teeth 5 into the riveted object during the riveting process due to the excessive width of the lower head flower teeth 5. Once it is not pressed into the riveted object, the lower head flower teeth 5 will not play a reinforcing and locking role.

[0106] In addition, the width of the lower head tooth 5 is too large, and the tooth processing requires multi-station molding, which increases the difficulty of processing, and the tooth is prone to breakage during the molding process, resulting in reduced connection quality;

[0107] According to the description of the above situation, the lateral length of the head-under-tooth 5 provided in this embodiment is L1, and the width from the side of the rivet nut body 1 to the side of the countersunk connecting flange 3 is L3. Not only is the top outer diameter of the head-under-tooth 5 smaller than the outer diameter of the countersunk connecting flange 3, but the preferred range of this size is L1 / L3≤0.7.

[0108] On this basis, in this embodiment, since the lower head flower teeth 5 will also enter the inner hole 2 of the rivet nut body 1, in order to achieve the purpose of improving the installation position accuracy of the countersunk rivet nut in a limited space, combined with the structure that the cross-sectional teeth of the lower head flower teeth 5 are equivalent to a long chamfer, the bottom outer diameter of the lower head flower teeth 5 is required to be smaller than the opening diameter on the sheet metal, and the top outer diameter of the lower head flower teeth 5 is required to be larger than the opening diameter on the sheet metal. Through the above dimensions, it can be achieved that when not installed, the lower diameter of the lower head flower teeth 5 is smaller than the opening diameter, which is conducive to the smooth entry of the parts into the installation hole of the sheet metal. For this reason, when the angle A is set to be relatively small, a guiding effect is formed to ensure the accuracy of the installation position.

[0109] It should be specifically stated that, Figure 4 As shown, the length of the lower head tooth 5 on the rivet nut body 1 is L2, and the angle between the inclined surface of the lower head tooth 5 and the side surface of the rivet nut body 1 is A, which requires not only L2>L1, but also 25°≥A≥10°. Through the constraints of the above dimensions, the lower head tooth 5 can be designed as a long strip, and the tooth shape is smaller and sharper, which can make the countersunk rivet nut easier to press into the riveted object, and can also help to strengthen the locking effect with the sheet metal.

[0110] Furthermore, the inclined structure of the lower flower teeth 5 of the head makes the lower part have a guiding function, so that accurate positioning can be achieved when the installation hole opening accuracy is not high, thereby ensuring the effect of accurate installation position.

[0111] From the overall structure, the width of the lower head teeth 5 gradually increases along the direction close to the countersunk rivet nut, which is similar to a pyramidal structure. Instead of using a tooth structure with the same thickness, the lower head teeth 5 can have a certain thickness and strength, so that when the lower head teeth 5 are pressed into the preset holes of the sheet metal, a larger contact area can be formed, which increases the friction between the lower head teeth 5 and the sheet metal, thereby enhancing the locking effect;

[0112] At the same time, when the head lower teeth 5 are subjected to circumferential pressure, they can disperse stress more effectively, avoid damage caused by stress concentration, and further improve the durability and safety of the connection;

[0113] In addition, the pyramid-shaped structure of the lower head flower teeth 5 fits more closely with the preset hole, which can provide more accurate guidance during the pressing process, helping to ensure that the lower head flower teeth 5 enter the preset hole smoothly and orderly, forming a stable connection and ensuring the effect of precise alignment.

[0114] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A countersunk rivet nut with a special head shape and tooth structure, characterized in that: include: A rivet nut body (1), wherein an inner hole (2) is formed in the rivet nut body (1); A countersunk connecting flange (3), the countersunk connecting flange (3) is integrally arranged on the top of the rivet nut body (1), the bottom circumference of the countersunk connecting flange (3) is a conical structure, and after installation, it is inserted into the sheet metal part, and the top of the countersunk connecting flange (3) is arranged flush with the sheet metal part; A mounting opening (4), wherein the countersunk connecting flange (3) is provided with a mounting opening (4), and the mounting opening (4) is connected to the inner hole (2); The lower head flower teeth (5) are integrally provided with the lower head flower teeth (5) facing the outer side surface at the connection point between the countersunk connecting flange (3) and the rivet nut body (1). When installing, the lower head flower teeth (5) are inserted into the matching sheet metal part.

2. The countersunk rivet nut with special head shape and tooth structure according to claim 1, characterized in that: The countersunk connecting flange (3) is integrally provided with a flange head (31) and a connecting end (32) along a direction close to the rivet nut body (1); The flange head (31) is arranged in a waist-shaped structure and is opened to the lower connecting end (32), and the waist-shaped structure of the flange head (31) includes arc-shaped structures (33) on both sides and a straight-line structure (34) located between the arc-shaped structures (33) on both sides; The connecting end (32) is arranged in an inverted conical structure, and the bottom is connected to the rivet nut body (1).

3. The countersunk rivet nut with special head shape and tooth structure according to claim 2, characterized in that: The outer diameter of the countersunk connecting flange (3) is D1, and the straight length between the linear structures (34) on the two opposite sides is H; Among them, 0.95≥H / D1≥0.

80.

4. The countersunk rivet nut with special head shape and tooth structure according to claim 3, characterized in that: A knurled structure (6) is also provided on the outer circumference of the rivet nut body (1), and the top of the knurled structure (6) is arranged no higher than the bottom of the lower flower teeth (5).

5. The countersunk rivet nut with special head shape and tooth structure according to claim 4, characterized in that: The top of the lower head flower teeth (5) is integrally connected to the connection end (32) of the countersunk connecting flange (3), and the bottom of the lower head flower teeth (5) is integrally connected to the outer circumference of the rivet nut body (1); The lower head flower teeth (5) are arranged in an inclined shape on a side away from the rivet nut body (1).

6. The countersunk rivet nut with special head shape and tooth structure according to claim 5, characterized in that: The transverse length of the lower head teeth (5) is L1, and the width from the side of the rivet nut body (1) to the side of the countersunk connecting flange (3) is L3; Among them, L1 / L3≤0.

7.

7. The countersunk rivet nut with special head shape and tooth structure according to claim 6, characterized in that: The outer diameter of the bottom of the head-under-the-head flower tooth (5) is smaller than the diameter of the opening on the sheet metal part, and the outer diameter of the top of the head-under-the-head flower tooth (5) is larger than the diameter of the opening on the sheet metal part.

8. The countersunk rivet nut with special head shape and tooth structure according to claim 7, characterized in that: The length of the lower head tooth (5) on the rivet nut body (1) is L2; Where L2>L1; The angle between the inclined surface of the lower head tooth (5) and the side surface of the rivet nut body (1) is A; Among them, 25°≥A≥10°.

9. The countersunk rivet nut with special head shape and tooth structure according to claim 8, characterized in that: The width of the lower head teeth (5) gradually increases along the direction approaching the countersunk rivet nut.

10. The countersunk rivet nut with special head shape and tooth structure according to claim 9, characterized in that: The inner hole (2) in the rivet nut body (1) adopts a blind hole or a through hole structure.

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