A type of anti-loosening press-fit nut

Abstract

This utility model discloses an anti-loosening press-fit nut, relating to the field of fastener technology. It includes a press-fit nut body, a press-fit force-bearing end, an annular edging, a metal locking plate, and a plate. The press-fit force-bearing end is located at the top of the press-fit nut body, and the press-fit force-bearing end and the press-fit nut body are integrally formed. The annular edging is located at the center of the top of the press-fit force-bearing end, and the annular edging has a hollow structure. The metal locking plate is located on the inner wall of the annular edging and is connected to the bottom end of the inner wall of the annular edging. This utility model, when fixed to a plate, allows the embossed teeth to contact the plate and withstand external pressure. Under pressure, the bottom end of the embossed teeth presses into a pre-drilled hole in the plate, causing plastic deformation of the material around the hole. The deformed material is squeezed into the groove between the embossed teeth, forming a reliable locking structure. This effectively suppresses relative rotation between the press-fit nut and the plate, significantly improves torsional resistance, and meets the fixing requirements under high torque conditions.

Description

Technical Field

[0001] This utility model relates to the field of fastener technology, specifically to an anti-loosening press-fit nut. Background Technology

[0002] A press-fit nut is a fastener used on thin sheets or sheet metal materials. It is cylindrical in shape with knurled teeth and a guide groove at one end. The working principle is as follows: the knurled teeth are pressed into a pre-drilled hole in the sheet metal. The hole diameter is typically slightly smaller than the outer diameter of the knurled teeth. Applying pressure forces the knurled teeth into the sheet metal, causing plastic deformation in the area around the hole. The deformed material is forced into the guide groove, thus creating a mechanical locking effect.

[0003] However, in specialized assembly fields prone to vibration, existing press-fit nuts are susceptible to vibration displacement under vibration and impact loads, which can induce loosening of the connecting bolts. This phenomenon significantly reduces the stability of the connection between the press-fit nut and the bolt, posing a risk of separation and a potential threat to the structural safety of the assembled workpiece.

[0004] Utility model application CN201721607185.8 discloses a press-fit nut with an embedded nylon ring, comprising: a press-fit nut body and a nylon ring disposed within the press-fit nut body. By adding a nylon ring to the body of the press-fit nut, after the press-fit nut is assembled with the bolt, the nylon ring is compressed by the threads on the bolt, which can effectively prevent the press-fit nut from loosening after being joined with the bolt.

[0005] The above technology has the following shortcomings: the locking torque of this structure mainly originates from the frictional resistance torque generated by the nylon ring inside the press-fit nut. In high-temperature and highly corrosive environments, nylon materials are prone to aging, leading to a significant decline in their mechanical properties, making them insufficient to resist the compressive stress applied by the bolt threads and causing failure. The frictional resistance torque subsequently decreases, causing the press-fit nut and bolt to loosen and fall off.

[0006] Utility model application CN202420178876.4 discloses an anti-loosening press-fit nut, comprising: a nut body, a stamping port provided near the inner hole of the nut body, and a stamping block formed on the side of the stamping port near the meshing part, the stamping block protruding from the inner surface of the internal thread. The stamping block causes an interference fit between the external thread of the bolt and the internal thread of the press-fit nut, thereby generating a large frictional force between the external and internal threads on the bolt, making the press-fit nut more securely connected to the bolt, and effectively preventing the bolt from loosening easily when the press-fit nut is subjected to impact loads.

[0007] The above technology has the following shortcomings: the locking torque of this structure mainly originates from the frictional resistance torque generated by the stamping block inside the press-fit nut body. The contact between the stamping block and the thread is multiple point contacts, which are prone to wear and failure under vibration conditions. As the frictional resistance torque decreases, the press-fit nut body and bolt may loosen and fall off.

[0008] Therefore, this application proposes an anti-loosening press-fit nut. Utility Model Content

[0009] The purpose of this utility model is to provide an anti-loosening press-fit nut to solve the problems mentioned in the background art.

[0010] To achieve the above objectives, this utility model provides the following technical solution: an anti-loosening press-fit nut, comprising a press-fit nut body, a press-fit force-bearing end, an annular edging, a metal locking plate, and a plate;

[0011] The riveting force-bearing end is located at the top of the riveting nut body, and the riveting force-bearing end and the riveting nut body are integrally formed.

[0012] The annular edging is located at the top center of the riveting force-bearing end, and the annular edging is a hollow structure.

[0013] The metal locking piece is located on the inner wall of the annular edging, and the metal locking piece is connected to the bottom end of the inner wall of the annular edging;

[0014] The bottom end of the press-fit nut body extends with embossed teeth that are fixed thereto, and the bottom end of the embossed teeth extends with guide grooves that are fixed thereto. An inwardly recessed annular groove is provided between the embossed teeth and the guide groove.

[0015] Furthermore, the top of the plate has a pre-drilled hole that is compatible with the body of the press-fit nut.

[0016] Furthermore, an internal thread is provided between the riveting force-bearing end and the embossed teeth, and the internal thread contacts the metal locking piece.

[0017] Furthermore, the inner diameter of the metal locking piece is smaller than the inner diameter of the internal thread.

[0018] Furthermore, the internal thread is connected to the bolt thread via the external thread, and the bolt is located at the center of the top of the press-fit nut body.

[0019] Furthermore, the outer diameter of the embossed teeth is smaller than the outer diameter of the rivet nut body, and the rivet nut body and the embossed teeth are coaxial.

[0020] Compared with the prior art, the beneficial effects of this utility model are:

[0021] This anti-loosening press-fit nut, when fixed to a sheet metal plate, has its embossed teeth contacting the plate and bearing external pressure. Under pressure, the bottom of the embossed teeth presses into a pre-drilled hole in the plate, causing plastic deformation of the material around the hole. The deformed material is squeezed into the groove between the embossed teeth, forming a reliable locking structure. This effectively suppresses relative rotation between the press-fit nut and the plate, significantly improving torsional resistance and meeting the fixing requirements under high torque conditions. Simultaneously, the material generated by the plastic deformation around the pre-drilled hole is squeezed into the annular groove, forming a locking ring structure. This locking ring ensures a tight fit between the press-fit nut and the plate, greatly enhancing the strength of the connection structure, effectively suppressing the shaking of the connector, and preventing the press-fit nut from falling off the plate. Through the synergistic effect of the mechanical engagement formed by the embossed teeth and the locking ring structure of the annular groove, a dual locking mechanism is achieved. This design significantly improves torsional resistance and anti-rotation effect, effectively ensuring the structural stability of the connection between the press-fit nut and the plate.

[0022] Meanwhile, the inner diameter of the metal locking plate protrudes from the internal thread. When the bolt and the press-fit nut body are assembled, the metal locking plate and the external thread of the bolt form an interference fit, thereby generating a large frictional resistance torque on the external thread of the bolt, making the assembly of the bolt and the press-fit nut body more secure and preventing the press-fit nut and bolt from vibrating and displacing and loosening when subjected to vibration and impact loads. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall axonometric structure of this utility model;

[0024] Figure 2 This is a bottom view of the structure of this utility model;

[0025] Figure 3 This is a top view of the structure of this utility model;

[0026] Figure 4 For the present utility model Figure 3 Schematic diagram of the sectional structure of the middle AA section;

[0027] Figure 5 This is a schematic diagram of the metal locking plate structure of this utility model;

[0028] Figure 6 This is a schematic diagram of the installation of the press-fit nut body and the plate of this utility model.

[0029] In the picture:

[0030] 1. Press-fit nut body; 11. Press-fit force-bearing end; 12. Annular edging; 13. Knitted teeth; 14. Annular groove; 15. Guide groove; 16. Internal thread;

[0031] 2. Metal lock plate;

[0032] 3. Sheet metal; 31. Pre-drilled holes in the sheet metal;

[0033] 4. Bolt; 41. External thread. Detailed Implementation

[0034] 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.

[0035] It should be noted that in the description of this utility model, the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0036] Furthermore, it should be understood that, for ease of description, the dimensions of the various components shown in the accompanying drawings are not drawn to actual scale; for example, the thickness or width of some layers may be exaggerated relative to other layers.

[0037] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined or described in one figure, it will not need to be discussed or described in detail in the description of the subsequent figures.

[0038] like Figures 1-5 As shown, this utility model provides a technical solution: an anti-loosening press-fit nut, including a press-fit nut body 1, a press-fit force-bearing end 11, an annular edging 12, a metal locking piece 2, and a plate 3;

[0039] The riveting force-bearing end 11 is located at the top of the riveting nut body 1, and the riveting force-bearing end 11 and the riveting nut body 1 are integrally formed.

[0040] The annular edging 12 is located at the top center of the riveting end 11, and the annular edging 12 is a hollow structure.

[0041] The metal locking piece 2 is located on the inner wall of the annular edging 12, and the metal locking piece 2 is connected to the bottom end of the inner wall of the annular edging 12.

[0042] The bottom end of the press-fit nut body 1 has an embossed tooth 13 fixed thereto, and the bottom end of the embossed tooth 13 has a guide groove 15 fixed thereto. An inwardly recessed annular groove 14 is provided between the embossed tooth 13 and the guide groove 15.

[0043] In some embodiments of this application, the diameter of the riveting force-bearing end 11 is larger than that of the annular edging 12. When the riveting nut body 1 is pressed into the plate 3, the force is applied to the riveting force-bearing end 11, rather than the annular edging 12, thereby preventing deformation or damage to the annular edging 12 and the metal locking piece 2 after being subjected to force. The metal locking piece 2 is made of metal, and its appearance can be point contact or longer line contact. The embossed teeth 13 are gear-shaped, and the number and size of the embossed teeth 13 can be modified. The interface of the embossed teeth 13 can be a slanted triangle or a slanted trapezoidal structure. If the number of teeth in the embossed teeth 13 is reduced, the size of each individual embossed tooth 13 needs to be increased.

[0044] The top of the plate 3 has a plate reserved hole 31, which is adapted to the press-fit nut body 1.

[0045] An internal thread 16 is provided between the riveting force-bearing end 11 and the embossed teeth 13, and the internal thread 16 contacts the metal locking piece 2.

[0046] The inner diameter of metal locking piece 2 is smaller than the inner diameter of internal thread 16.

[0047] The internal thread 16 is threaded to the bolt 4 via the external thread 41, and the bolt 4 is located at the center of the top of the press-fit nut body 1.

[0048] The outer diameter of the embossed teeth 13 is smaller than the outer diameter of the rivet nut body 1, and the rivet nut body 1 and the embossed teeth 13 are coaxial.

[0049] In some embodiments of this application, the press-fit nut body 1, the annular edging 12, and the embossed teeth 13 are integrally formed, which makes the press-fit nut body 1 stronger and meets the usage requirements in high-strength scenarios. The radial cross-section of the press-fit nut body 1 and the embossed teeth 13 are both circular.

[0050] In use, the rivet nut body 1 is fixed to the plate pre-drilled hole 31 on the top of the plate 3 to be fixed. Then, a force is applied to the rivet force-bearing end 11. The embossed teeth 13 contact the plate 3 and are subjected to the force. Under the pressure, the bottom end of the embossed teeth 13 is pressed into the plate pre-drilled hole 31, causing the material around the plate pre-drilled hole 31 to undergo plastic deformation. The deformed material is squeezed into the groove between the embossed teeth 13, forming a reliable locking structure. This effectively suppresses the relative rotation between the rivet nut body 1 and the plate 3, thereby improving the torsional resistance and meeting the fixing requirements of high torque conditions. At the same time, the material generated by the plastic deformation around the plate pre-drilled hole 31 is simultaneously squeezed into the annular groove 14 to form a locking ring structure. This structure makes the rivet nut body 1 and the plate 3 fit tightly together, enhances the connection strength, effectively suppresses the shaking of the connecting parts, and prevents the rivet nut body 1 from falling off the plate 3.

[0051] Meanwhile, the inner diameter of the metal locking plate 2 is smaller than the inner diameter of the internal thread 16. When the bolt 4 is screwed into the rivet nut body 1, the external thread 41 is interference-fitted with the metal locking plate 2, thereby generating a large friction torque between the external thread 41 of the bolt 4 and the metal locking plate 2. This makes the assembly of the bolt 4 and the rivet nut body 1 more secure, preventing the rivet nut body 1 and the bolt 4 from loosening due to vibration displacement when subjected to vibration and impact loads. Because the inner diameter of the metal locking plate 2 is smaller than the inner diameter of the internal thread 16, the bolt 4 will squeeze the metal locking plate 2, thereby preventing loosening during the assembly of the rivet nut body 1 and the bolt 4.

[0052] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended embodiments and their equivalents.

Claims

1. A type of anti-loosening press-fit nut, characterized in that, It includes a press-fit nut body (1), a press-fit force-bearing end (11), an annular edging (12), a metal locking plate (2), and a plate (3). The riveting force-bearing end (11) is located at the top of the riveting nut body (1), and the riveting force-bearing end (11) and the riveting nut body (1) are integrally formed. The annular edging (12) is located at the top center of the riveting end (11), and the annular edging (12) is a hollow structure; The metal locking piece (2) is located on the inner wall of the annular edging (12), and the metal locking piece (2) is connected to the bottom end of the inner wall of the annular edging (12); The bottom end of the rivet nut body (1) extends with embossed teeth (13) fixed thereto, and the bottom end of the embossed teeth (13) extends with guide grooves (15) fixed thereto. An inwardly recessed annular groove (14) is provided between the embossed teeth (13) and the guide grooves (15).

2. The anti-loosening press-fit nut according to claim 1, characterized in that: The plate (3) has a plate reserved hole (31) at the top, which is adapted to the press nut body (1).

3. The anti-loosening press-fit nut according to claim 1, characterized in that: An internal thread (16) is provided between the riveting force-bearing end (11) and the embossed tooth (13), and the internal thread (16) contacts the metal locking piece (2).

4. The anti-loosening press-fit nut according to claim 1, characterized in that: The inner diameter of the metal locking piece (2) is smaller than the inner diameter of the internal thread (16).

5. The anti-loosening press-fit nut according to claim 3, characterized in that: The internal thread (16) is threaded to a bolt (4) via an external thread (41), and the bolt (4) is located at the center of the top of the press-fit nut body (1).

6. The anti-loosening press-fit nut according to claim 1, characterized in that: The outer diameter of the embossed teeth (13) is smaller than the outer diameter of the rivet nut body (1), and the rivet nut body (1) and the embossed teeth (13) are coaxial.

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