Pressing rivet injection molding blind hole nut
By designing a press-fit injection-molded blind hole nut and utilizing anti-rotation teeth and toothed knurling structure, the problem of nut loosening during injection molding connection was solved, achieving efficient mechanical engagement and stable connection.
Patent Information
- Application Number
- CN202423184952.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-24
- Publication Date
- 2025-12-05
- Estimated Expiration
- 2034-12-24
AI Technical Summary
Existing nuts, due to their smooth surface, cannot form a firm mechanical engagement with the plastic matrix in injection molding connections, and are prone to loosening under dynamic loads or rotational torque.
A press-fit injection molded blind hole nut was designed, comprising a nut body, a connecting part, anti-rotation teeth, and a toothed knurled structure. The sawtooth design forms an efficient mechanical engagement with the substrate, and the gaps between the teeth are filled during the injection molding process to enhance the bonding force, while a buffer area is reserved to absorb the extrusion force.
It significantly improves the nut's resistance to rotation and connection stability under dynamic loads, prevents loosening, reduces damage to the base material, and ensures connection reliability under complex working conditions.
Smart Images
Figure CN223635100U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to nut technical field especially relates to pressure riveting injection blind hole nut. BACKGROUND
[0002] In the prior art, nuts are usually used as mechanical connecting pieces, especially in scenarios requiring pressure riveting connection with plastic or metal substrates.
[0003] In the application of injection connection, the nut usually needs to be embedded in the plastic substrate, and the plastic is wrapped around the nut through the injection process to form a firm mechanical connection. However, if the surface of the nut is too smooth, the plastic cannot form a firm mechanical bite with the nut after cooling, which may cause the nut to loosen under the action of dynamic load or rotational torque. Therefore, the pressure riveting injection blind hole nut is proposed to solve the above problems. SUMMARY
[0004] The utility model discloses a pressure riveting injection blind hole nut to solve the shortcomings in the prior art.
[0005] To achieve the above object, the utility model adopts the following technical scheme:
[0006] The pressure riveting injection blind hole nut comprises a nut body and a connecting part, the connecting part is integrally formed at the end of the nut body, a 45-degree chamfer is arranged at the connecting position of the nut body, a threaded hole is arranged at one end of the connecting part along the axial direction of the nut body, and the threaded hole extends into the nut body, tooth-shaped knurls two and tooth-shaped knurl one are respectively arranged at the two ends of the nut body, a certain gap exists between the tooth-shaped knurl one and the tooth-shaped knurl two, anti-rotation teeth are arranged on the outer wall of the connecting part, the anti-rotation teeth are arranged in close contact with the outer wall of the tooth-shaped knurl one, and the radius size of the anti-rotation teeth is smaller than that of the tooth-shaped knurl one.
[0007] Preferably, the tooth-shaped knurl one and the tooth-shaped knurl two are uniformly distributed tooth-shaped structures, and the tooth height is consistent with the tooth spacing.
[0008] Preferably, the anti-rotation teeth are sawtooth structures, and the tooth tips are arc-shaped.
[0009] Preferably, the effective thread depth of the threaded hole is 18.8MIN, the thread standard is M8x1.25-6G, the axial direction size of the tooth-shaped knurl one and the tooth-shaped knurl two along the nut body is 8NOM, and the diameter is φ14.
[0010] Preferably, the gap between the tooth-shaped knurl one and the tooth-shaped knurl two forms a buffer area during pressure riveting.
[0011] The utility model has the following beneficial effects:
[0012] 1. The utility model discloses a tooth-shaped knurling and its sawtooth structure are set up with the plastic matrix or metal matrix surface form high -efficient mechanical occlusion, and effectively relieve stress concentration through arc tooth top design, the anti -rotation ability of nut under dynamic load is improved obviously, thereby effectively prevent the nut body from loosening with bolt rotation in the process that bolt is tightened or disassembled.
[0013] 2. The utility model discloses a tooth-shaped knurling and its uniform distribution tooth shape structure can make molten plastic fill the tooth gap and form close combination in injection molding process, embed the matrix surface and provide high -efficient friction in the pressure riveting process, simultaneously through the buffer area reserved between the two and absorption extrusion force, ensure that the stress is even and reduce the matrix damage, thereby the connection stability and durability of nut under complex working condition are improved obviously. BRIEF DESCRIPTION OF DRAWINGS
[0014] Figure 1 It is the structure schematic diagram of pressure riveting injection molding blind hole nut that the utility model proposes;
[0015] Figure 2 It is Figure 1 structure schematic diagram.
[0016] Figure 3 It is Figure 1 sectional structure schematic diagram.
[0017] In the drawing: 1, nut body;2, thread hole;3, tooth-shaped knurling one;4, anti -rotation tooth;5, tooth-shaped knurling two;6, link part. DETAILED DESCRIPTION
[0018] The technical scheme in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments.
[0019] Referring to Figures 1-3 , pressure riveting injection molding blind hole nut, including nut body 1 and link part 6, link part 6 is integrally formed in the end of nut body 1, and 45 degree chamfer is equipped at the link of nut body 1, and the thread hole 2 along the axial direction of nut body 1 is set up in one end of link part 6, and the thread hole 2 extends to the inside of nut body 1, and the both ends of nut body 1 are fixedly connected with tooth-shaped knurling two 5 and tooth-shaped knurling one 3 respectively, and there is a certain gap between tooth-shaped knurling one 3 and tooth-shaped knurling two 5, and anti -rotation tooth 4 is arranged on the outer wall of link part 6, and anti -rotation tooth 4 is arranged in conjunction with the outer wall of tooth-shaped knurling one 3, and the radius size is less than the radius size of tooth-shaped knurling one 3;
[0020] Further, the anti-rotation teeth 4 can form a stronger anti-rotation torque with the plastic base, preventing the nut body 1 from loosening due to bolt rotation during tightening or disassembly, and the serrated design enhances the mechanical engagement force and adapts to the deformation characteristics of the plastic base.
[0021] The tooth-shaped knurling one 3 and the tooth-shaped knurling two 5 are uniformly distributed tooth-shaped structures with consistent tooth height and tooth spacing;
[0022] Further, the uniform tooth shape can ensure uniform filling of the tooth gap during injection molding, enhancing the bonding force of the nut and the plastic.
[0023] The anti-rotation teeth 4 are serrated structures with arc-shaped tooth tips, the effective thread depth of the threaded hole 2 is 18.8MIN, and the thread standard is M8x1.25-6G, the axial dimension of the tooth-shaped knurling one 3 and the tooth-shaped knurling two 5 along the nut body 1 is 8NOM, and the diameter is φ14, and the gap between the tooth-shaped knurling one 3 and the tooth-shaped knurling two 5 is used to form a buffer area during press-in;
[0024] Further, the arc-shaped tooth tips of the anti-rotation teeth 4 can relieve stress concentration on the base surface, avoiding damage to the plastic base or metal base.
[0025] In the utility model, during the working process, the anti-rotation teeth 4 of the nut body 1 form efficient mechanical engagement with the plastic base or metal base surface through the serrated structure. When the nut body 1 is subjected to dynamic load or tightening or disassembly of the bolt, the embedding action provided by the anti-rotation teeth 4 can effectively resist the rotation torque, preventing the nut body 1 from loosening with the bolt rotation. At the same time, the arc-shaped tooth tip design relieves the stress concentration phenomenon, avoiding excessive pressure damage to the base, thereby adapting to the requirements of different base materials and hardness.
[0026] The tooth-shaped knurling one 3 and the tooth-shaped knurling two 5 can fill the tooth gap with molten plastic during the injection molding process, forming a tight engagement after cooling, ensuring the bonding strength of the plastic and the nut body 1. In the press-in process, the tooth-shaped structure of the tooth-shaped knurling one 3 and the tooth-shaped knurling two 5 is embedded into the base surface, providing reliable friction force and embedding force, enhancing the fixing effect and maintaining stability in high vibration or dynamic load scenarios. At the same time, the gap between the tooth-shaped knurling one 3 and the tooth-shaped knurling two 5 forms a buffer area, absorbing the extrusion force of the base material during the press-in process, making the stress more uniform and reducing potential damage to the base.
[0027] Overall, the overall structure of the device can efficiently solve the problems of easy loosening, rotation failure and matrix damage in dynamic load and injection molding process by the cooperation of the anti-rotation tooth 4 and the tooth-shaped knurl 1 and the tooth-shaped knurl 2, combined with the optimized threaded hole 2 and the buffer area, so as to realize reliable mechanical connection.
[0028] The above is only the preferred specific implementation of the present application, but the protection scope of the present application is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.
Claims
1. A press-in plastic blind nut comprising a nut body (1) and a coupling portion (6), characterized in that, The adapter (6) is integrally formed at the end of the nut body (1), and a 45-degree chamfer is arranged at the adapter position of the nut body (1), one end of the adapter (6) is provided with a threaded hole (2) extending along the axial direction of the nut body (1), and the threaded hole (2) extends to the inside of the nut body (1), the two ends of the nut body (1) are respectively fixedly connected with the tooth-shaped knurl two (5) and the tooth-shaped knurl one (3), there is a certain gap between the tooth-shaped knurl one (3) and the tooth-shaped knurl two (5), the outer wall of the adapter (6) is provided with an anti-rotation tooth (4), the anti-rotation tooth (4) is arranged in close contact with the outer wall of the tooth-shaped knurl one (3), and the radius size is smaller than the radius size of the tooth-shaped knurl one (3).
2. The press-riveted injection-molded blind-nut of claim 1, wherein, The tooth-shaped knurl one (3) and the tooth-shaped knurl two (5) are both uniformly distributed tooth-shaped structures, and the tooth height is consistent with the tooth spacing.
3. The press-in-place nut of claim 2, wherein, The anti-rotation tooth (4) is a sawtooth structure, and the tooth top is arc-shaped.
4. The press-in-place nut of claim 3, wherein, The effective thread depth of the threaded hole (2) is 18.8MIN, and the thread standard is M8x1.25-6G, the axial direction size of the tooth-shaped knurl one (3) and the tooth-shaped knurl two (5) along the nut body (1) is 8NOM, and the diameter is φ14.
5. The press-in-place nut of claim 4, wherein, The gap between the tooth-shaped knurl one (3) and the tooth-shaped knurl two (5) is used to form a buffer area during pressure riveting.