A novel nut anti-loosening structure

Abstract

This utility model discloses a novel nut anti-loosening structure, relating to the field of mechanical fastener technology, and applicable to plastic electronic products, home appliances, automotive parts, and other fields. The structure includes a plastic housing, a metal nut embedded within the housing, and an anti-loosening plastic hole located at the outlet end of the threaded hole of the metal nut, all three being coaxially arranged. The diameter of the anti-loosening plastic hole is smaller than the nominal diameter of the screw and is integrally formed with the plastic housing; the metal nut is injection-molded and embedded within the housing. After the screw passes through the threaded hole of the metal nut, it is screwed into the anti-loosening plastic hole. The elastic deformation of the plastic generates a continuous radial clamping force and axial frictional resistance, effectively preventing the screw from loosening under high-frequency vibration or temperature change environments. This structure requires no additional anti-loosening parts, is low-cost, simple to manufacture, compact in structure, provides long-lasting anti-loosening force, and has high reliability, solving the problems of easy loosening in traditional structures and high cost of existing solutions.

Description

Technical Field

[0001] This utility model relates to the field of mechanical fastener technology, and in particular to a novel nut anti-loosening structure that can effectively prevent screws from loosening when applied to plastic products. Background Technology

[0002] In the fields of plastic electronics, home appliances, and automotive parts, it is often necessary to embed metal nuts inside plastic housings to achieve a secure connection between components. The traditional method is to directly injection mold the metal nut (such as a copper nut) insert into the plastic part. However, this structure has a significant drawback: when the product is used in environments with high-frequency vibration or drastic temperature changes, slight relative displacement can easily occur between the screw and nut. Over time, this can lead to a decrease in preload and even screw loosening, seriously affecting the reliability and safety of the product.

[0003] To address this issue, existing technologies typically employ additional parts or processes such as adding spring washers or thread sealant. However, this not only increases material costs and assembly complexity but is also limited in certain applications with stringent cleanliness or space requirements.

[0004] Therefore, there is an urgent need for a nut anti-loosening solution that is simple in structure, low in cost, and has a reliable anti-loosening effect. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a new type of nut anti-loosening structure, which aims to effectively prevent screws from loosening in a vibrating environment without adding extra parts and assembly steps.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A novel anti-loosening structure for nuts includes a plastic housing, a metal nut embedded within the plastic housing, and an anti-loosening plastic hole located at the outlet end of the threaded hole of the metal nut. The anti-loosening plastic hole is coaxially arranged with the threaded hole of the metal nut, allowing the screw to continue being screwed into the anti-loosening plastic hole after it has passed through the threaded hole. The elastic deformation of the plastic material applies radial clamping force and axial frictional resistance to the screw. This technical solution, by providing an anti-loosening plastic hole coaxial with the threaded hole at the outlet end of the metal nut's threaded hole, utilizes the elastic deformation of the plastic material to apply radial clamping force and axial frictional resistance to the screw during screwing, thereby preventing the screw from loosening. It is suitable for environments with high-frequency vibration or temperature changes, improving the reliability and safety of the connection.

[0008] Furthermore, the diameter of the anti-loosening plastic hole is slightly smaller than the nominal diameter of the screw to ensure sufficient interference and clamping force to prevent loosening due to vibration.

[0009] Furthermore, the length of the anti-loosening plastic hole is 0.5 to 2 times the nominal diameter of the screw, so as to provide sufficient guidance and stable frictional contact area for the screw.

[0010] Furthermore, metal nuts can be made of common metal materials such as copper or steel, which have good mechanical properties and injection molding compatibility.

[0011] Furthermore, the metal nut is encapsulated and embedded in the plastic shell by injection molding, and the anti-loosening plastic hole and the plastic shell are integrally formed, requiring no subsequent secondary processing.

[0012] Compared with the prior art, the nut anti-loosening structure provided by this utility model has the following significant advantages:

[0013] Excellent anti-loosening effect: Utilizing the elasticity and toughness of plastic materials, it forms continuous radial pressure and axial friction on the screw, effectively resisting loosening caused by vibration and impact.

[0014] Low cost: No additional anti-loosening parts (such as washers, anaerobic adhesives, etc.) are required. The function is achieved entirely through structural design, which reduces material costs and warehousing management costs.

[0015] Simple process: The anti-loosening structure and the outer shell are integrally injection molded, without changing the existing insert injection molding production process or adding additional assembly steps, making it easy to implement.

[0016] Compact structure: The entire anti-loosening structure is integrated inside the product, without occupying external space, making it suitable for compact designs.

[0017] High reliability: The elastic deformation of plastic provides continuous anti-loosening force, slow performance degradation, and long service life. 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 an overall schematic diagram of an embodiment of the present utility model;

[0020] Figure 2 A cross-sectional schematic diagram provided for an embodiment of this utility model;

[0021] Figure 3 This is a cross-sectional exploded view provided for an embodiment of the present utility model.

[0022] The following are the labeling elements in the figure:

[0023] 1. Plastic outer shell; 2. Metal nut; 3. Anti-loosening plastic hole; 4. Screw; 5. Nut mounting hole.

[0024] The accompanying drawings have illustrated specific embodiments of the present invention, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the present invention in any way, but rather to illustrate the concept of the present invention to those skilled in the art through reference to specific embodiments. Detailed Implementation

[0025] 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, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0026] In existing technologies, metal nuts such as copper nuts are typically directly injection-molded into plastic parts. However, this structure is prone to slight relative displacement between the screw and nut under high-frequency vibration or drastic temperature changes, leading to a decrease in preload or even screw loosening, affecting product reliability and safety. While solutions include adding spring washers or using thread-locking adhesive, these increase costs and processes and may be limited by cleanliness or space constraints. This new structure is designed to solve this problem. It eliminates the need for additional anti-loosening components, achieving anti-loosening functionality entirely through structural design, reducing material and warehousing costs. Furthermore, the anti-loosening structure is integrally injection-molded with the outer shell, requiring no changes to existing insert injection molding processes or additional assembly steps, facilitating industrial production. The entire anti-loosening structure is integrated internally, occupying no external space, making it suitable for compact designs. The elastic deformation of the plastic provides continuous anti-loosening force with slow performance degradation and a long service life. It is effectively applicable to plastic electronic products, home appliances, automotive parts, and other fields, effectively solving the problem of loose nuts and screws without increasing additional costs or manufacturing complexity.

[0027] Please see Figures 1-3As shown, this novel anti-loosening nut structure mainly consists of a plastic housing 1, a metal nut 2 embedded in the plastic housing 1, and an anti-loosening plastic hole 3 located at the outlet end of the threaded hole of the metal nut 2. The anti-loosening plastic hole 3 is coaxially arranged with the threaded hole of the metal nut 2. Its core design is to utilize the elastic deformation characteristics of plastic material. When the screw 4 passes through the threaded hole of the metal nut 2 and continues to be screwed into the anti-loosening plastic hole 3, it can apply a continuous radial clamping force and axial frictional resistance to the screw 4, thereby effectively preventing the screw 4 from loosening in environments with high-frequency vibration or drastic temperature changes.

[0028] like Figure 2 , Figure 3 As shown, the diameter of the anti-loosening plastic hole 3 is slightly smaller than the nominal diameter of the screw 4 to ensure sufficient interference and clamping force. Its length is set to 0.5 to 2 times the nominal diameter of the screw 4 to provide sufficient guidance and stable friction contact area for the screw 4, ensuring the stability of the anti-loosening effect. The metal nut 2 can be made of materials with good mechanical properties and injection molding compatibility, such as copper or steel. It is encapsulated and embedded in the nut mounting hole 5 of the plastic shell 1 through injection molding. The anti-loosening plastic hole 3 and the plastic shell 1 are integrally molded, eliminating the need for subsequent secondary processing and simplifying the production process.

[0029] In practice, the plastic housing 1 is injection molded. During the molding process, the metal nut 2 is embedded in the nut mounting hole 5 of the plastic housing 1. Simultaneously, the required anti-loosening plastic hole 3 is directly formed through injection molding, ensuring the structural stability and coaxiality between the metal nut 2, the plastic housing 1, and the anti-loosening plastic hole 3. When the screw 4 is tightened, the screw 4 first passes through the threaded hole of the metal nut 2 embedded in the plastic housing 1, and then continues to be screwed into the anti-loosening plastic hole 3. The elastic deformation of the anti-loosening plastic hole 3 caused by the screw 4 being screwed in creates a continuous radial clamping force and axial frictional resistance, thus forming a complete and effective nut anti-loosening structure, ensuring the reliability and safety of the connection.

[0030] Of course, in addition to embedding the metal nut 2 into the nut mounting hole 5 of the plastic shell 1 during the molding process, holes can also be drilled directly on the surface of the plastic shell 1. First, drill the nut mounting hole 5, then drill the anti-loosening plastic hole 3, and then heat and press the metal nut 2 into the nut mounting hole 5.

[0031] Other embodiments of the present invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention. This application is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and embodiments are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the foregoing claims.

[0032] It should be understood that this invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this invention is limited only by the appended claims.

Claims

1. A novel nut anti-loosening structure, characterized in that: It includes a plastic housing (1), a metal nut (2) embedded in the plastic housing (1), and an anti-loosening plastic hole (3) provided at the threaded hole outlet end of the metal nut (2); the anti-loosening plastic hole (3) is coaxially arranged with the threaded hole of the metal nut (2) and is used to continue to screw into the anti-loosening plastic hole (3) after the screw (4) passes through the threaded hole, and to apply radial clamping force and axial friction resistance to the screw (4) by utilizing the elastic deformation of the plastic material.

2. The novel nut anti-loosening structure according to claim 1, characterized in that: The diameter of the anti-loosening plastic hole (3) is smaller than the nominal diameter of the screw (4).

3. The novel nut anti-loosening structure according to claim 1, characterized in that: The length of the anti-loosening plastic hole (3) is 0.5 to 2 times the nominal diameter of the screw (4).

4. The novel nut anti-loosening structure according to claim 1, characterized in that: The metal nut (2) is a copper nut or a steel nut.

5. The novel nut anti-loosening structure according to claim 1, characterized in that: The metal nut (2) is encased and embedded in the nut mounting hole (5) of the plastic shell (1) by injection molding. The anti-loosening plastic hole (3) and the plastic shell (1) are integrally formed.

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