A press-in-place sealing nut

Abstract

The utility model discloses a kind of pressure riveting sealing nuts in the technical field of fastening nut, including stud, flange is arranged on the stud, one end of the flange is fixedly connected with stud, the other end of the flange is provided with boss, anti-rotation tooth is arranged on the flange, installation slot is opened in the flange, rubber ring is sleeved in the installation slot, blind hole is opened in the boss, internal thread is arranged in the blind hole.The utility model realizes rigid and flexible by metal-elastic body composite structure, and mechanical strength is provided by anti-rotation tooth piercing into sheet metal and boss cold forging interlock for hard connection, and micro gap is filled by pre-compression rubber ring to realize dynamic sealing for soft connection, wherein, metal bears main load, rubber compensates vibration deformation, and both work cooperatively, high-strength fastening and instant sealing are completed synchronously in single pressure riveting, and it is suitable for leakage prevention scene under vibration working condition.

Description

Technical Field

[0001] This utility model relates to the field of fastening nut technology, and in particular to a press-fit sealing nut. Background Technology

[0002] Traditional press-fit nuts are primarily formed by cold forging and then pressed onto sheet metal, utilizing plastic deformation to create a mechanical interlock. This type of structure relies on the interference fit between the metals to provide anti-loosening capability. However, due to the inherent characteristics of hard connections, the preload is easily reduced by fretting wear under vibration conditions. Early designs often employed passive anti-loosening measures such as sawtooth patterns or localized deformation, but these still pose a risk of loosening under high-frequency vibration and lack effective vibration energy dissipation mechanisms, resulting in insufficient long-term reliability.

[0003] However, existing technologies have some problems: under actual vibration conditions, periodic alternating loads are generated, leading to relative displacement at the microscopic level. During long-term vibration, the metal material undergoes cumulative effects of elastic deformation and plastic creep, causing the contact pressure at the riveting joint to gradually decrease. Simultaneously, hard connections lack damping and buffering characteristics, preventing effective dissipation of vibration energy and resulting in a continuous decrease in the friction coefficient between the threaded pairs. This fretting wear under dynamic loads can disrupt the mechanical interlocking structure formed in the initial stage of riveting, ultimately leading to a decrease in preload and loosening of the connection. Therefore, we propose a press-fit sealing nut. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a press-fit sealing nut. The purpose of this utility model is achieved as follows: A press-fit sealing nut includes a stud, a flange on the stud, one end of the flange being fixedly connected to the stud, a boss on the other end of the flange, anti-rotation teeth on the flange, an installation groove on the flange, a rubber ring fitted inside the installation groove, a blind hole on the boss, and an internal thread inside the blind hole.

[0005] Optionally, the boss is frustum shaped, and the small end of the boss contacts the flange.

[0006] Optionally, the stud, flange, and boss are coaxial, and the stud, flange, and boss are integrally formed.

[0007] Optionally, the number of anti-rotation teeth is multiple, and the multiple anti-rotation teeth are circumferentially distributed, with the anti-rotation teeth located at the edge of the flange.

[0008] Optionally, the mounting groove is located at the connection between the flange and the boss, and a transition end face is provided at the connection between the mounting groove and the anti-rotation tooth.

[0009] Optionally, the blind hole extends through the flange and the boss, and a guide end is provided on the blind hole.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0011] 1. In the embodiments provided by this utility model, the flange end face has multiple anti-rotation teeth, and the groove structure provided below the boss is used to fix the rubber ring. Furthermore, the diameter of the groove is smaller than the diameter of the upper edge of the boss to ensure that the rubber ring does not fall off. In use, the riveting nut pierces and rivets the sheet metal, the anti-rotation teeth are embedded in the sheet metal, and the material around the piercing hole of the sheet metal is pressed on the rubber ring and interlocked with the boss. The potential leakage channel in the riveting area is blocked by the elastic rubber ring, thereby ensuring the sealing of the riveting area.

[0012] 2. Achieving a balance of rigidity and flexibility through a metal-elastomer composite structure: The rigid connection provides mechanical strength through anti-rotation teeth penetrating the sheet metal and cold forging interlocking of the boss, while the flexible connection achieves dynamic sealing by filling the micro gaps with pre-compressed rubber rings. In this system, the metal bears the main load, while the rubber compensates for vibration deformation. The two work together to simultaneously achieve high-strength fastening and immediate sealing in a single riveting operation, making it suitable for leak prevention scenarios under vibration conditions. 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 structure provided by this utility model.

[0015] Figure 2 This is a cross-sectional schematic diagram of the overall structure provided by this utility model.

[0016] In the diagram: 1. Stud; 11. Flange; 12. Boss; 13. Anti-rotation tooth; 14. Transition end face; 15. Guide end; 2. Mounting groove; 21. Rubber ring; 3. Blind hole; 31. Internal thread. Detailed Implementation

[0017] 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.

[0018] like Figures 1 to 2The shown is a press-fit sealing nut, including a stud 1, a flange 11 provided on the stud 1, one end of the flange 11 being fixedly connected to the stud 1, a boss 12 provided on the other end of the flange 11, anti-rotation teeth 13 provided on the flange 11, an installation groove 2 provided on the flange 11, a rubber ring 21 sleeved in the installation groove 2, a blind hole 3 provided on the boss 12, and an internal thread 31 provided in the blind hole 3.

[0019] It should be noted that the height of the anti-rotation tooth 13 is greater than the thickness of the rubber ring 21 after compression, ensuring that the anti-rotation tooth 13 pierces the sheet metal first during riveting, and the rubber ring 21 does not overflow under pressure; the rubber ring 21 and the groove adopt an interference fit, and are pre-compressed and fixed to prevent falling off; the piercing boss 12 guides the plastic flow of the sheet metal at an angle, forming a multi-layer mechanical snap; the outer diameter of the rubber ring 21 is greater than the diameter of the boss 12, and after riveting, it expands radially to seal the micro gaps in the sheet metal hole wall.

[0020] Furthermore, the embodiments provided by this utility model solve the problems of traditional press-fit nuts being prone to loosening and failing to seal under vibration conditions by combining soft and hard approaches.

[0021] First, the height of the anti-rotation tooth 13 is greater than the thickness of the compressed rubber ring 21, ensuring that the metal structure establishes a mechanical connection first during the riveting process. The anti-rotation tooth 13 can stably penetrate the sheet metal to form an anti-rotation structure, while avoiding excessive compression and overflow of the rubber ring 21, thus achieving the dual requirements of anti-loosening and sealing.

[0022] Secondly, the rubber ring 21 and the groove adopt an interference fit, which can be pre-compressed and fixed, which can not only prevent it from falling off during assembly, but also provide initial pressure for subsequent sealing; and the outer diameter of the rubber ring 21 is larger than the diameter of the boss 12, so that the nut can fully expand radially after being riveted to the sheet metal, filling the micro gaps in the sheet metal hole wall and forming a dynamic sealing barrier.

[0023] Finally, the inclined design of the boss 12 can guide the flow of sheet metal material and form a multi-level mechanical interlocking structure. Together with the elastic seal of the rubber ring 21, it can ensure high tensile strength and anti-rotation torque on the one hand, and withstand a certain medium pressure on the other.

[0024] Specifically, the boss 12 is shaped like a frustum, and the small end of the boss 12 contacts the flange 11.

[0025] Furthermore, the small end of the boss 12 is directly connected to the flange 11, and the large end faces the sheet metal piercing direction. This allows for a gradual application of force during the riveting process. The small end has a smooth transition, avoiding stress concentration that could lead to metal fatigue. The large end's beveled surface generates a material guiding effect during piercing, allowing the sheet metal to flow evenly along the beveled surface and reducing the risk of cracking.

[0026] At the same time, the diameter gradient change creates a self-centering effect, ensuring that the boss 12 and the sheet metal hole are automatically corrected for misalignment during riveting.

[0027] Specifically, the stud 1, flange 11 and boss 12 are coaxial and integrally formed.

[0028] Furthermore, the stud 1, flange 11, and boss 12 are integrally machined through a precision forming process, maintaining the continuity of the material fibers and improving the overall mechanical properties and strength. A smooth arc design is adopted in the transition area to disperse stress concentration, so that the nut can still maintain excellent stability when riveted.

[0029] Specifically, there are multiple anti-rotation teeth 13, which are distributed circumferentially and located at the edge of the flange 11.

[0030] Furthermore, during the riveting process, multiple anti-rotation teeth 13 can evenly cut into the sheet metal material, establishing multi-point mechanical engagement in the circumferential direction, effectively dispersing torsional stress, which not only enhances the overall anti-rotation capability, but also avoids local deformation or failure caused by single-point force.

[0031] Meanwhile, the circumferentially distributed anti-rotation teeth 13 work together with the flange 11 to automatically correct positional deviations during riveting, ensuring that the connectors are always in the best alignment state. The multi-tooth structure can provide a larger contact area and maintain stable anti-rotation even under long-term vibration conditions.

[0032] Specifically, the mounting groove 2 is located at the connection between the flange 11 and the boss 12, and a transition end face 14 is provided at the connection between the mounting groove 2 and the anti-rotation tooth 13.

[0033] Furthermore, the streamlined shape of the transition end face 14 makes the stress distribution more uniform, avoids stress concentration at the root of the anti-rotation tooth 13, and improves the fatigue resistance of the overall structure. The mounting groove 2 can ensure that the rubber sealing ring has sufficient compression space to prevent the sealing material from being excessively squeezed and deformed during the riveting process.

[0034] Specifically, the blind hole 3 penetrates the flange 11 and the boss 12, and a guide end 15 is provided on the blind hole 3.

[0035] Furthermore, the blind hole 3 structure penetrates through the flange 11 and the boss 12, and its end is located inside the stud 1 and is closed, forming a sealed cavity to prevent the medium from seeping along the thread.

[0036] Working principle: During riveting, the riveting nut initially contacts the sheet metal, and the boss 12 first contacts the edge of the sheet metal hole. Subsequently, the anti-rotation teeth 13 preferentially penetrate the sheet metal to form an anti-rotation structure. At this time, the rubber ring 21 is not yet under pressure, ensuring that the metal structure establishes a mechanical connection first.

[0037] Subsequently, boss 12 continues to press down, causing shear plastic deformation of the sheet metal. The sheet metal material flows along the inclined plane, forming a three-layer structure:

[0038] 1. Flows upwards, filling the gap of anti-rotation teeth 13, and enhancing torsional resistance;

[0039] 2. Radial expansion to wrap around the inclined surface of boss 12, forming a metal cladding layer;

[0040] 3. Press downwards to enter the groove at the root of the boss 12, forming the locking flange 11;

[0041] At this point, the rubber ring 21 begins to contact the sheet metal, but is not yet fully compressed.

[0042] Subsequently, when the boss 12 penetrates the sheet metal to a certain thickness, the rubber ring 21 is squeezed by the bottom surface of the sheet metal. At the same time, the sheet metal material forms a ring-shaped locking structure at the root of the boss 12, which interlocks with the boss 12.

[0043] Meanwhile, under vibration / temperature change environment:

[0044] During minor vibrations, the rubber ring 21 elastically deforms to absorb energy and maintain a seal;

[0045] During large vibrations, the metal interlocking structure bears the main load, and the rubber ring 21 compensates for the displacement through the "breathing effect".

[0046] When temperature changes occur, the rubber ring 21 adapts to thermal expansion to avoid stress concentration.

[0047] 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 press-fit sealing nut, comprising a stud (1), characterized in that: The stud (1) is provided with a flange (11), one end of the flange (11) is fixedly connected to the stud (1), the other end of the flange (11) is provided with a boss (12), the flange (11) is provided with an anti-rotation tooth (13), the flange (11) is provided with an installation groove (2), a rubber ring (21) is sleeved in the installation groove (2), the boss (12) is provided with a blind hole (3), and the blind hole (3) is provided with an internal thread (31).

2. The press-fit sealing nut according to claim 1, characterized in that: The boss (12) is truncated cone-shaped, and the small end of the boss (12) is in contact with the flange (11).

3. A press-fit sealing nut according to claim 1, characterized in that: The stud (1), flange (11) and boss (12) are coaxial and are integrally formed.

4. A press-fit sealing nut according to claim 1, characterized in that: The number of anti-rotation teeth (13) is multiple, and the multiple anti-rotation teeth (13) are distributed in a circle. The anti-rotation teeth (13) are located at the edge of the flange (11).

5. A press-fit sealing nut according to claim 1, characterized in that: The mounting groove (2) is located at the connection between the flange (11) and the boss (12), and a transition end face (14) is provided at the connection between the mounting groove (2) and the anti-rotation tooth (13).

6. A press-fit sealing nut according to claim 1, characterized in that: The blind hole (3) passes through the flange (11) and the boss (12), and a guide end (15) is provided on the blind hole (3).

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