A trapezoidal bi-metal internal thread structure

Abstract

The utility model relates to mechanical connection technical field, concretely relates to a trapezoidal bimetal inner thread structure, including inner thread main part and organism, its characterized in that inner thread main part and organism adopt interference assembly method and combine together, the inner thread main part adopts high strength alloy material, the organism adopts the metal material of higher plasticity, the inner thread main part has 2~6 trapezoidal teeth of even arrangement along the axial direction, the upper base and waist angle of trapezoidal tooth shape is 100~140 DEG, aims at improving the structural stability and anti -pulling off performance of inner thread under high load and complex working condition, the utility model relates to the structure design reasonable, assembly reliable, is applicable to the complex mechanical structure of high strength inner thread connection.

Description

Technical Field

[0001] This utility model relates to the field of mechanical connection technology, specifically to a trapezoidal bimetallic internal thread structure. Background Technology

[0002] Bolted connections are a widely used type of detachable fixed connection, offering advantages such as simple structure, reliable connection, and convenient assembly and disassembly. Due to their low cost, simple structure, ease of disassembly, repair, and parts replacement, bolted connections are widely used in various connection scenarios within composite material structures. Statistics show that in many fields, including aerospace, machinery, and oil drilling, bolted connections account for over 60% of connection methods. Especially in high-stress, high-load environments, bolted connections require excellent load-bearing capacity and durability.

[0003] Traditional threaded structures, made of a single material, suffer from problems such as a contradiction between strength and toughness (e.g., high-strength bolts cause plastic deformation of the internal threads), insufficient interfacial bonding strength (mechanical composites are prone to delamination), and poor corrosion resistance.

[0004] For example, the high-strength stress bolts that support the engine block and cylinder head in an engine bear a large force when connecting parts. Under the action of fastening load, cracks are prone to initiating from the inside of the threaded hole. The internal threads of materials such as cast aluminum alloy / cast iron are usually the weak points of fatigue strength in mechanical parts. High-strength bolts often cause plastic deformation of the internal threads with weak fatigue strength. Summary of the Invention

[0005] The technical problem to be solved by this utility model is to overcome the defects of the prior art and provide a trapezoidal bimetallic internal thread structure that can enhance the service life of the internal thread, prevent thread deformation, and have self-locking capability so as to be applicable to different working conditions.

[0006] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0007] This utility model discloses a trapezoidal bimetallic internal thread structure, comprising an internal thread body and a body. The internal thread body is connected to the body by an interference fit. The internal thread body is made of a high-strength alloy material, and the body is made of a metal material with high plasticity. The internal thread body has 2 to 6 trapezoidal teeth evenly arranged along the axial direction, and the angle between the upper base and the waist of the trapezoidal teeth is 100° to 140°.

[0008] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0009] This invention combines two different materials to enhance the service life of existing internal threads, prevent deformation of weaker internal threads due to high-strength bolts, increase the interface contact area, and improve the joint strength. By adjusting the number of teeth and the included angle, the fit performance is optimized, making it compatible with standard internal threads and possessing versatility. The trapezoidal structure provides self-locking capability, making it suitable for various working conditions, such as bolted connections subjected to high preload, alternating loads, and vibration. The trapezoidal structure also reduces stress concentration caused by the combination of the two metals. Attached Figure Description

[0010] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0011] Figure 1 This is a schematic diagram of the internal thread body of this utility model, taking a 3-tooth example.

[0012] Figure 2 This is a schematic diagram of the machine's structure;

[0013] Figure 3 This is a schematic diagram of the assembly of the internal thread body and the machine body;

[0014] In the diagram: Internal thread body 1, trapezoidal teeth 11, machine body 2. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0016] In the attached diagram, all identical reference numerals refer to the same components.

[0017] like Figures 1 to 3 As shown, this utility model provides a trapezoidal bimetallic internal thread structure, including an internal thread body 1 and a body 2. The internal thread body 1 has a trapezoidal tooth structure, with three trapezoidal teeth 11 evenly arranged along the axial direction. This structure helps to improve the stress distribution of the thread, reduce stress concentration, and enhance connection stability and fatigue resistance. The angle between the upper base and the waist of the trapezoidal tooth is set to 110°. This angle enhances the thread engagement performance and is beneficial for processing and subsequent maintenance.

[0018] Specifically, the internal thread body 1 is installed inside the body 2 via an interference fit, forming a reliable connection. The internal thread body 1 is made of high-strength alloy material 42CrMoA to improve its load-bearing capacity and shear resistance, meeting the connection requirements under complex load conditions; the body 2 is made of aluminum alloy, a metal material with high plasticity, to enhance the deformation coordination and vibration absorption capacity of the mating structure, avoiding damage to the body due to stress concentration.

[0019] Specifically, during the assembly process, the internal thread body 1 is usually cooled to a low temperature in liquid nitrogen or other cooling media to cause it to shrink to a certain extent, and then quickly inserted into the hole in the body 2. After the temperature rises, it returns to its original size, forming a firm interference fit. This connection method is simple and reliable, and is suitable for working conditions with high requirements for connection strength and sealing, such as diesel engine cylinder blocks and pressure vessel connection ends.

[0020] It should be noted that in this application, relational terms such as "first" and "second" are used merely 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.

[0021] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A trapezoidal bimetallic internal thread structure, comprising an internal thread body (1) and a body (2), characterized in that, The internal thread body (1) is connected to the machine body (2) by interference fit; the internal thread body (1) is made of high-strength alloy material, and the machine body (2) is made of metal material with high plasticity; the internal thread body (1) has 2 to 6 trapezoidal teeth (11) evenly arranged along the axial direction, and the angle between the upper bottom and the waist of the trapezoidal teeth (11) is 100° to 140°.

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