Locking seal pull-rivet stud

Abstract

The utility model discloses the technical field of pull rivet stud's anti -loose sealing pull rivet stud, including pull rivet nut and stud bolt, still include: set up in the blind hole area in pull rivet nut, just the internal thread for adapting stud bolt is arranged in blind hole area, the top of pull rivet nut is integrative and has the flange for anti -loose, and the lower part of flange is coated with the sealing glue for sealing, the pull rivet nut is located flange lower part and is set up and prevents the rotation flower tooth of opening. The utility model discloses the collaborative design of blind hole area, the high and low temperature resistant sealing gum of flange lower part and the elastic flange structure of pull rivet nut, and blind hole area can block axial leakage channel, and the high and low temperature resistant sealing gum can fill the small gap of flange and the counterparty article and form horizontal seal, and elastic flange can still ensure sealing stability through sustained adhesion pressure, finally help two -way reliable sealing, adapt the harsh scene of high sealing requirement, and the prior art is difficult to give consideration to long -term sealing effect and high and low temperature adaptability.

Description

Technical Field

[0001] This utility model relates to the field of rivet stud technology, and in particular to anti-loosening and sealing rivet studs. Background Technology

[0002] Rivet studs are fasteners that combine riveting and threaded connection functions. Because they can be tightened by operating from one side, they are widely used in the automotive, aerospace, electronic equipment, and construction industries, and are especially suitable for enclosed structures or hard-to-reach installation scenarios.

[0003] However, with the increasing complexity of industrial applications, existing rivet studs have gradually revealed many shortcomings: First, during the riveting process, gaps are easily formed between the stud and the sheet metal. Even with sealing gaskets, they are prone to aging and seal failure under high and low temperature conditions, making it difficult to meet high sealing requirements. Second, the deformation zone of the rivet stud has low strength. In environments with high vibration and high and low temperature changes, the riveting zone is prone to creep, which leads to a gradual decrease in preload and loosening of the connection. Therefore, it is not suitable for high-load applications. Thus, we urgently need anti-loosening sealing rivet studs to solve the above problems. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides an anti-loosening sealing rivet stud. Through the synergy of blind hole area, elastic flange, high and low temperature resistant sealant, circumferential knives and embedded rivet ring, it forms a better seal, dynamic compensation of preload, strong anti-rotation and high connection strength, making it suitable for harsh scenarios such as automotive battery packs and aerospace.

[0005] The purpose of this utility model is as follows: it includes a rivet nut and a stud, and further includes: a blind hole area provided in the rivet nut, and the blind hole area is provided with an internal thread for adapting to the stud; the top of the rivet nut is integrally formed with a flange for anti-loosening, and the lower part of the flange is coated with sealant for sealing; the rivet nut is provided with anti-rotation teeth on the lower part of the flange; a smooth rod area is provided in the middle of the stud, and a riveting groove is provided between the smooth rod area and the lower thread area of ​​the stud; when the stud is threadedly connected in the rivet nut, it is rolled by external equipment and an embedded riveting area is formed at the riveting groove position.

[0006] Optionally, the flange has a concave umbrella-shaped cross-section.

[0007] Optionally, in the non-working area, the included angle between the flange and the rivet nut is 60°-90°, and in the working area, the included angle between the flange and the rivet nut is 89°-90°.

[0008] Optionally, the sealant is a high and low temperature resistant sealing material.

[0009] Optionally, the number of the serrations is multiple, and multiple sets of serrations are evenly arranged along the circumference of the rivet nut rod.

[0010] Optionally, a drive head for connecting tools is integrally formed on the top of the double-ended stud.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. This utility model effectively solves the problem of sealing failure caused by the fit clearance or high and low temperature aging of the sealing gasket due to the blind hole area of ​​the rivet nut, the high and low temperature resistant sealant at the bottom of the flange, and the elastic flange structure. The blind hole area can block the axial leakage channel, the high and low temperature resistant sealant can fill the small gap between the flange and the fitting to form a horizontal seal, and the elastic flange can also ensure the sealing stability through continuous fitting pressure. Ultimately, it helps to achieve reliable bidirectional sealing and is suitable for harsh scenarios with high sealing requirements. Existing technologies are difficult to balance long-term sealing effect and high and low temperature adaptability.

[0012] 2. This utility model solves the problems of preload decay, weak anti-rotation capability, and insufficient connection strength of existing rivet studs by using the preload compensation function of the elastic flange, the mechanical anti-rotation structure with uniform circumferential teeth, and the high-strength connection design with embedded rivet ring. The elastic flange can compensate for the loss of preload caused by high and low temperature fluctuations and high frequency vibrations in real time, reducing connection loosening; the embedded rivet ring can strengthen the fixation of the rivet nut and the double-ended stud, and improve the overall axial tensile strength. Existing technologies are prone to connection reliability decline due to creep and friction anti-rotation failure. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the overall assembly structure provided by this utility model.

[0015] Figure 2 This is a schematic diagram of the rivet nut and double-ended bolt connection structure provided by this utility model.

[0016] Figure 3 This utility model provides Figure 2 Schematic diagram of the middle half section structure.

[0017] Figure 4 This is a schematic diagram of the rivet nut structure provided by this utility model.

[0018] Figure 5 This is a schematic diagram of the double-headed bolt structure provided by this utility model.

[0019] In the diagram: 1. Rivet nut; 2. Double-ended stud; 3. Blind hole area; 4. Internal thread; 5. Flange; 6. Sealant; 7. Spline; 8. Smooth rod area; 9. Riveting groove; 10. Drive head. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] like Figure 1-5 As shown in the figure, the present invention provides an anti-loosening sealing rivet stud, including a rivet nut 1 and a double-ended stud 2, with a drive head 10 for connecting tools integrally formed on the top of the double-ended stud 2.

[0022] Here, the drive head 10 adopts industry-standard head types such as Torx, Torx Plus, external Torx or hexagonal head, and is compatible with common manual or automated tools on the market, improving automated assembly efficiency and making it suitable for mass production; the transition between the head and the stud is rounded with 0.3mm, which further improves the structural reliability during the assembly process and reduces rework caused by head damage.

[0023] It also includes a blind hole area 3 set in the rivet nut 1, and the blind hole area 3 is provided with an internal thread 4 for adapting to the double-ended stud 2.

[0024] Here, the depth of the blind hole area 3 is 1-2 mm greater than the lower threaded area of ​​the stud 2, forming a closed axial channel to prevent external liquids and dust from entering through the thread gap, while also reducing internal grease leakage. The diameter of the blind hole area 3 and the minor diameter of the internal thread 4 are fitted with an H8 tolerance. The internal thread 4 is machined using a rolling process, ensuring a 6H thread accuracy. The thread angle is 60° and the crest and root of the thread are rounded to reduce the thread fit clearance. It can withstand a tightening torque of 5-8 N·m without stripping. In addition, the coaxiality of the blind hole and the internal thread 4 is controlled within 0.03 mm, further reducing the possibility of eccentricity after the stud 2 is screwed in. This lays the foundation for the uniformity of force distribution in subsequent roll forming and riveting, improving the overall stability of the connection. It is especially suitable for assembling precision equipment with high coaxiality requirements.

[0025] The top of the rivet nut 1 is integrally formed with a flange 5 for preventing loosening. The cross-sectional shape of the flange 5 is concave umbrella-shaped. In the non-working area, the included angle between the flange 5 and the rivet nut 1 is 60°-90°. In the working area, the included angle between the flange 5 and the rivet nut 1 is 89°-90°.

[0026] Here, flange 5 and rivet nut 1 are integrally cold-forged with a gradient design of 1-1.5mm edge thickness and 2-2.5mm center thickness. This design ensures structural strength and reduces cracking of flange 5 due to uneven stress during riveting. In the non-riveted state, the angle α between flange 5 and the rod is 75°. After riveting, it is flattened to 89°-90°, ensuring full surface contact with the other parts. This force can compensate for the attenuation of preload caused by vibration and high or low temperatures. During vibration, it absorbs energy to maintain the fitting pressure, reduces cold shrinkage and separation at low temperatures, and offsets thermal expansion stress at high temperatures. In addition, the unit area pressure of flange 5 during riveting is ≤5MPa, which can be used for thin-walled plates of 1-2mm, reducing the possibility of deformation or cracking of the plate due to excessive pressure.

[0027] Furthermore, the lower part of flange 5 is coated with sealant 6 for sealing, and sealant 6 is a high and low temperature resistant sealing material.

[0028] Here, sealant 6 is applied automatically using a dispensing machine, with a thickness controlled between 0.2 and 0.3 mm. The application area is a 2 mm inward annular region from the edge of flange 5, which increases the contact surface between flange 5 and the mating part and reduces adhesive layer misalignment. The sealant 6 is selected according to the working conditions, such as GD414 silicone sealant for automotive applications and FS203 fluorosilicone sealant for aerospace applications, with a temperature resistance range of -60℃ to 200℃. It can fill the processing gap of less than 0.05 mm between flange 5 and the mating part, which helps to achieve horizontal sealing. At the same time, after the sealant 6 is applied, it is pre-cured for 1 to 2 hours before assembly, which can effectively reduce the problem of the adhesive layer being stuck by tools or the flow problem caused by uncured adhesive. Moreover, the integrated design of the adhesive layer and flange 5 improves the reliability of the seal.

[0029] The rivet nut 1 is provided with anti-rotation serrations 7 located on the lower part of the flange 5. There are multiple serrations 7, and multiple sets of serrations 7 are evenly arranged around the circumference of the shank of the rivet nut 1.

[0030] Here, the number of 7 teeth is adapted to the diameter of the rivet nut 1. For M6, select 8 groups; for M8, select 10 groups; and for M10, select 12 groups. They are evenly distributed along the circumference of the shank, with adjacent included angles of 30°-45°. They are machined using a hobbing process, resulting in smooth, burr-free tooth surfaces. During riveting, they can embed into the surface of plastic materials such as aluminum alloys and thin steel plates, resisting the circumferential rotation tendency of the stud through static friction force distributed on the circumference.

[0031] A smooth rod area 8 is provided in the middle of the double-ended stud 2. A riveting groove 9 is provided between the smooth rod area 8 and the lower threaded area of ​​the double-ended stud 2. When the double-ended stud 2 is threadedly connected to the rivet nut 1, it is rolled by external equipment and an embedded riveting area is formed at the position of the riveting groove 9.

[0032] Here, the difference between the diameter of the smooth rod area 8 and the outer diameter of the threads at both ends of the double-ended stud 2 is ≤0.05mm. The surface is machined using a centerless grinding process, with a roughness of Ra0.8-Ra1.6 and a cylindricity of ≤0.01mm. When screwed into the blind hole of the rivet nut 1, it can play a precise guiding role, keeping the coaxiality of the stud and the blind hole within 0.03mm, reducing the misalignment of the riveting groove 9 during subsequent roll riveting. At the same time, the smooth surface of the smooth rod reduces the frictional resistance with the wall of the blind hole. The smooth rod area 8 undertakes the guiding function, reducing the direct friction between the threads and the wall of the blind hole. The length of the smooth rod area 8 is 1 / 3 of the total length of the stud. The transition between the smooth rod area 8 and the threads at both ends is rounded with a 0.5mm radius, which can reduce stress concentration and further improve the structural strength of the stud, making it suitable for high-load assembly scenarios.

[0033] Furthermore, the riveting groove 9 is an annular groove with a width of 2-3 mm and a depth of 0.5-1 mm, which facilitates the flow of the metal material of the rivet nut 1 into the groove during rolling to form an embedded riveting ring; the embedded structure does not protrude outward, occupies little space, and can be adapted to narrow scenarios with installation gaps ≤5 mm; in addition, the mechanical locking effect between the riveting ring and the riveting groove 9 is strong, effectively resisting axial movement caused by high-frequency vibration and improving long-term connection stability.

[0034] Example 1: Anti-loosening sealing rivet studs for automotive battery packs (M8 specification) Component parameters: Rivet nut 1 is made of 45 steel (HRC28-32), with a rod diameter of 8mm and a blind hole depth of 12mm; flange 5 has a diameter of 15mm (non-riveting angle 75°); sealant 6 is GD414 (coating thickness 0.25mm); serration 7 has 10 sets (tooth height 0.4mm); stud 2 is made of 304 stainless steel, with a total length of 25mm, a smooth rod diameter of 7.98mm, a riveting groove 9 with a width of 2.5mm and a depth of 0.8mm; drive head 10 is a Torxplus T20.

[0035] Example 2: Anti-loosening sealing rivet studs for aerospace equipment (M6 specification) Component parameters: Rivet nut 1 is made of TC4 titanium alloy (tensile strength ≥860MPa), shank diameter 6mm, blind hole depth 10mm, flange 5 diameter 12mm (non-riveting angle 80°), sealant 6 is FS203 (coating thickness 0.2mm), and the tooth 7 has 8 sets (tooth height 0.3mm); stud 2 is made of GH4169 alloy, total length 20mm, smooth shank diameter 5.97mm, riveting groove 9 width 2mm and depth 0.6mm, and drive head 10 is an external sprite head.

[0036] The working principle and usage process of this utility model are as follows: In the assembly stage, firstly, apply high and low temperature resistant sealant 6 to the lower surface of the flange 5 of the rivet nut 1 and let it stand until it is initially cured to reduce subsequent offset or peeling of the sealant layer; then, use a tool that is compatible with the universal drive head 10 at the top of the double-ended stud 2 to screw its lower thread into the blind hole area 3 of the rivet nut 1 and apply a preset torque. At this time, the blind hole area 3 and the internal thread 4 help to accurately position the axial direction, and the middle smooth rod area 8 reduces friction and assists in guidance; then, use a riveting machine to roll the area of ​​the rivet nut 1 corresponding to the stud riveting groove 9, so that the metal of the rivet nut 1 is plastically deformed and filled into the riveting groove 9, forming an embedded riveting ring to help lock the two together; finally, align the entire stud with the pre-made hole of the counterpart, and use a rivet gun to apply axial tension and flange 5 pressure, so that the flange 5 is flattened and fully contacts the counterpart and generates elastic recovery force. The sealant 6 is spread to fill the gap to form a horizontal seal, and the circumferential teeth 7 are embedded in the counterpart plate to form a mechanical anti-rotation engagement. Once in operation, the blind hole area 3 blocks axial leakage, and the sealant 6 maintains a horizontal seal, which helps with bidirectional sealing. The elastic recovery force of the flange 5 compensates for the preload attenuation caused by high and low temperature fluctuations and high frequency vibrations, reducing connection loosening. The toothed 7 resists circumferential rotation through circumferentially dispersed static friction, while the embedded riveting ring and high-strength material ensure axial tensile strength. Through the synergy of various structures, the entire system solves the problems of traditional rivet stud seal failure, preload loss, and connection loosening, making it suitable for harsh scenarios such as automotive battery packs and aerospace.

[0037] The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A locking and sealing rivet stud, comprising a rivet nut (1) and a double-ended stud (2), characterized in that: Also includes: A blind hole area (3) is provided in the rivet nut (1), and an internal thread (4) for adapting to the double-ended stud (2) is provided in the blind hole area (3). The top of the rivet nut (1) is integrally formed with a flange (5) for anti-loosening, and the lower part of the flange (5) is coated with sealant (6) for sealing. Anti-rotation serrations (7) are provided on the rivet nut (1) and located at the lower part of the flange (5). A smooth rod area (8) is provided in the middle of the double-ended stud (2). A riveting groove (9) is provided between the smooth rod area (8) and the lower threaded area of ​​the double-ended stud (2). When the double-ended stud (2) is threadedly connected to the rivet nut (1), it is rolled by external equipment and an embedded riveting area is formed at the position of the riveting groove (9).

2. The anti-loosening sealing rivet stud according to claim 1, characterized in that: The flange (5) has a concave umbrella-shaped cross-section.

3. The anti-loosening sealing rivet stud according to claim 1, characterized in that: When not in the working area, the included angle between the flange (5) and the rivet nut (1) is 60°-90°, and when in the working area, the included angle between the flange (5) and the rivet nut (1) is 89°-90°.

4. The anti-loosening sealing rivet stud according to claim 1, characterized in that: The sealant (6) is a high and low temperature resistant sealing material.

5. The anti-loosening sealing rivet stud according to claim 1, characterized in that: The number of the flower teeth (7) is multiple, and multiple sets of flower teeth (7) are evenly arranged along the circumference of the rivet nut (1).

6. The anti-loosening sealing rivet stud according to claim 1, characterized in that: A drive head (10) for connecting tools is integrally formed on the top of the double-ended stud (2).

Images