Waterproof pull riveting stud

Abstract

The utility model relates to the technical field of pull riveting studs, in particular to a waterproof pull riveting stud which comprises a bolt and a riveting nut arranged on the bolt in a sleeving mode. A bolt head is fixedly arranged at the end part of the bolt; the outer wall face, close to the bolt head, of the riveting nut is sequentially provided with a maintaining part, a deformation part and a flange part, the outer wall face of the maintaining part is of a circular structure, the waterproof pull riveting stud is of a stepped decreasing outer diameter structure, a three-stage cooperative sealing mechanism is formed through the flange part, the deformation part and the maintaining part, and the large outer diameter of the flange part provides an initial pressing face and guides assembling centering; the intermediate diameter of the deformation part generates controllable radial expansion to fill a microgap under riveting force, and the small diameter of the maintaining part is combined with a notch to enhance the occlusion sealing performance of the tail end, so that axial gradient seepage prevention is realized; a stress conduction path is optimized through different-diameter step design, the flange part preferentially bears axial pressure and induces the deformation part to directionally extend, and sealing failure caused by local stress overrun is avoided in cooperation with the stress dispersion characteristic of a notch of the maintaining part.

Description

Technical Field

[0001] This utility model relates to the field of rivet stud technology, specifically to waterproof rivet studs. Background Technology

[0002] A rivet stud is a high-strength single-sided fastener consisting of a threaded shank and a hollow rivet body. It is commonly made of steel, stainless steel, or aluminum alloy and is installed using a special rivet tool: the stud is inserted into a pre-drilled hole, and the tool applies axial tension to cause the rivet body to expand and deform, forming a mechanical interlock with the substrate. This process requires no welding or back-side operation and is particularly suitable for hollow structures, connections of dissimilar materials, and confined space operations. It features high tensile strength, vibration resistance to loosening, and excellent sealing performance.

[0003] Rivet studs can significantly improve assembly efficiency and connection reliability, but they still have certain problems: 1) Riveting stress concentration in local areas can easily cause the sealing layer to crack; 2) They do not have waterproof effect or have poor waterproof effect; 3) Conventional riveting structures are prone to loosening under dynamic loads. Therefore, in view of the above situation, it is urgent to develop waterproof rivet studs to overcome the shortcomings in current practical applications and meet current needs. Utility Model Content

[0004] The purpose of this invention is to provide waterproof rivet studs to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a waterproof rivet stud, including a bolt and a rivet nut fitted on the bolt;

[0006] The bolt head is fixed to the end of the bolt;

[0007] The outer wall surface of the rivet nut adjacent to the bolt head consists of the retaining part, the deformation part, and the flange part, in sequence.

[0008] Preferably, the outer wall of the retaining part adopts a circular structure, and the outer surface of the retaining part is provided with a number of grooves that are distributed in a ring shape at equal intervals.

[0009] In practical use, the circular structure of the retaining part ensures installation alignment and rotational stability, while the annular equidistantly distributed slots enhance structural strength and form multiple seepage barriers.

[0010] Preferably, the outer wall of the deformable part adopts a hexagonal structure.

[0011] In practical use, the deformable part undergoes directional plastic deformation during the riveting process, which can not only compensate for the assembly gap to achieve a tight fit, but also work with the flange to form an axial locking force to prevent moisture from penetrating along the threads.

[0012] Preferably, the outer wall of the flange has a circular structure.

[0013] In practical use, the wide contact surface of the flange can evenly distribute the load, and together with the stress guiding effect of the groove, it can effectively improve the vibration resistance and loosening resistance of the connection and the long-term sealing reliability.

[0014] Preferably, the outer diameter of the flange is larger than the outer diameter of the deformation part, and the outer diameter of the deformation part is larger than the outer diameter of the retaining part.

[0015] In practical use, the stepped structure with decreasing outer diameter forms a layered sealing barrier. The large outer diameter of the flange provides an initial compression sealing surface, while the middle diameter of the deformable part expands radially under the riveting force to fill the assembly gap. The small diameter of the retaining part fits the groove to form an end-locking seal, achieving a three-level gradient anti-seepage. The stepped outer diameter difference generates a progressive stress distribution during riveting. The flange preferentially absorbs axial pressure and guides the deformable part to extend in a directional manner, avoiding stress concentration that could lead to tearing of the sealing layer. During assembly, the large diameter structure of the flange has a self-centering guiding function, ensuring uniform compression deformation of the deformable part. At the same time, the stepped diameter difference forms a mechanical interlocking effect, significantly improving resistance to axial pull-out and radial shear.

[0016] Compared with the prior art, this utility model provides a waterproof rivet stud, which has the following beneficial effects:

[0017] This type of waterproof rivet stud adopts a stepped decreasing outer diameter structure to form a three-level synergistic sealing mechanism through the flange, deformation section, and retaining section. The large outer diameter of the flange provides the initial pressing surface and guides the assembly alignment. The middle diameter of the deformation section undergoes controllable radial expansion under riveting force to fill micro gaps. The small diameter of the retaining section, combined with the groove, enhances the end-biting sealing performance, achieving axial gradient seepage prevention. The stepped design optimizes the stress transmission path. The flange prioritizes bearing axial pressure and induces the deformation section to extend in a directional manner. Combined with the stress dispersion characteristics of the groove in the retaining section, it avoids sealing failure caused by excessive local stress. The three-stage structure forms a mechanical interlock after compression deformation. The wide contact surface of the flange suppresses vibration displacement, and the plastic deformation body of the deformation section absorbs dynamic loads. During installation, adhesive is applied between the flange and the deformation section, comprehensively improving waterproof performance, vibration resistance, durability, and connection strength. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the front structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the rear structure of the present invention;

[0021] Figure 3 This is a partial cross-sectional view of the riveting nut of this utility model;

[0022] Figure 4 This is a partial cross-sectional view of the bolt and rivet nut of this utility model;

[0023] Figure 5 This is a side longitudinal sectional view of the bolt and rivet nut of this utility model;

[0024] Figure 6 This is one of the partial cross-sectional views of the riveting nut of this utility model;

[0025] Figure 7 This is the second partial cross-sectional view of the riveting nut of this utility model.

[0026] In the diagram: 10, bolt; 110, bolt head; 20, rivet nut; 210, flange; 220, deformation part; 230, retaining part; 231, groove. Detailed Implementation

[0027] 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.

[0028] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] Example:

[0030] Please see Figures 1-7 This utility model provides a technical solution: a waterproof rivet stud, including a bolt 10 and a rivet nut 20 sleeved on the bolt 10;

[0031] Bolt head 110 is fixed to the end of bolt 10;

[0032] The outer wall surface of the rivet nut 20 adjacent to the bolt head 110 consists of a retaining part 230, a deforming part 220, and a flange part 210.

[0033] Preferably, the outer wall of the retaining part 230 adopts a circular structure, and the outer surface of the retaining part 230 is provided with a plurality of annularly distributed slots 231.

[0034] In practical use, the circular structure of the retaining part 230 ensures installation alignment and rotational stability, while the annularly spaced grooves 231 enhance structural strength and form multiple seepage barriers.

[0035] Preferably, the outer wall of the deformable part 220 adopts a hexagonal structure.

[0036] In practical use, the deformation part 220 undergoes directional plastic deformation during the riveting process, which can not only compensate for the assembly gap to achieve a tight fit, but also work with the flange part 210 to form an axial locking force to prevent moisture from penetrating along the threads.

[0037] Preferably, the outer wall of the flange portion 210 has a circular structure.

[0038] In practical use, the wide contact surface of the flange 210 can evenly distribute the load, and together with the stress guiding effect of the groove 231, it can effectively improve the vibration resistance and loosening resistance of the connection part and the long-term sealing reliability.

[0039] Preferably, the outer diameter of the flange portion 210 is larger than the outer diameter of the deformable portion 220, and the outer diameter of the deformable portion 220 is larger than the outer diameter of the retaining portion 230.

[0040] In practical use, the stepped structure with decreasing outer diameter forms a layered sealing barrier. The large outer diameter of the flange 210 provides an initial compression sealing surface, the medium diameter of the deformable part 220 expands radially under the riveting force to fill the assembly gap, and the small diameter of the retaining part 230 matches the groove 231 to form an end locking seal, achieving a three-level gradient anti-seepage. The stepped outer diameter difference generates a progressive stress distribution during riveting. The flange 210 preferentially absorbs axial pressure and guides the deformable part 220 to extend in a directional manner, avoiding stress concentration that could cause the sealing layer to tear. During assembly, the large diameter structure of the flange 210 has a self-centering guiding function, ensuring that the deformable part 220 is uniformly compressed and deformed. At the same time, the stepped diameter difference forms a mechanical interlocking effect, significantly improving the resistance to axial pull-out and radial shear.

[0041] Working principle: When using this waterproof rivet stud, adhesive is pre-applied between the flange 210 and the deformation part 220. The rivet nut 20 is inserted into the pre-drilled hexagonal riveting hole on the substrate to be riveted. The large outer diameter of the flange 210, combined with the hexagonal deformation part 220, achieves self-alignment and positioning during assembly. Then, the bolt 10 is axially pulled using a riveting tool, and pressure is applied to the retaining part 230 of the rivet nut 20 through the bolt head 110. The wide contact surface of the flange 210 pre-presses the substrate, forming the first mechanical seal and guiding the riveting force to the deformation part 220. Subsequently, the deformation part 220 undergoes radial plastic expansion under axial pressure, actively filling the assembly gap and... The extruded sealing material forms a bidirectional dynamic sealing interface, while the small-diameter structure of the retaining part 230 carries the annularly distributed grooves 231 embedded in the sealing layer. The end sealing boundary is cured by multi-tooth mechanical interlocking and chemical bonding. The stepped outer diameter difference causes stress to be released from the flange part 210 to the deformation part 220 in a gradient, promoting uniform extension rather than local tearing. The groove structure 231 disperses the circumferential stress into multi-directional micro-stress points to inhibit crack propagation. Finally, in the vibration environment, the deformation part 220 plays a damping effect to absorb impact energy. The stepped interlocking structure and the viscoelastic response of the sealant work together to suppress displacement, realizing an integrated protection mechanism of multi-level sealing, stress optimization and dynamic anti-loosening.

[0042] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A waterproof rivet stud, characterized in that: Includes a bolt (10) and a rivet nut (20) fitted onto the bolt (10); The bolt (10) has a bolt head (110) fixed at its end. The outer wall surface of the rivet nut (20) adjacent to the bolt head (110) consists of a retaining part (230), a deformation part (220), and a flange part (210).

2. The waterproof rivet stud according to claim 1, characterized in that: The outer wall of the retaining part (230) adopts a circular structure, and the outer surface of the retaining part (230) is provided with a number of annularly distributed slots (231).

3. The waterproof rivet stud according to claim 1, characterized in that: The outer wall of the deformable part (220) adopts a hexagonal structure.

4. The waterproof rivet stud according to claim 1, characterized in that: The outer wall of the flange (210) has a circular structure.

5. The waterproof rivet stud according to claim 1, characterized in that: The outer diameter of the flange (210) is greater than the outer diameter of the deformable part (220), and the outer diameter of the deformable part (220) is greater than the outer diameter of the retaining part (230).

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