Anti-loosening fastening assembly

Abstract

The utility model discloses an anti-loosening fastening assembly, which relates to the technical field of fasteners, and comprises a bolt, the bolt comprises a first screw rod, the end face of the first screw rod is provided with a blind hole recessed inwards, and the peripheral surface of the first screw rod is provided with a first external thread; the top of the second screw rod is connected into the blind hole, a second external thread is arranged on the peripheral surface of the bottom of the second screw rod, and the outer diameter of the first screw rod is larger than that of the second screw rod; the nut is provided with a first threaded hole and a second threaded hole which are communicated, the inner diameter of the first threaded hole is larger than that of the second threaded hole, and the nut is matched with the first external thread through the first threaded hole and matched with the second external thread through the second threaded hole, so that connection between the first screw and the second screw is achieved. According to the anti-loosening fastening assembly, the technical problem that a nut of an existing fastening assembly is prone to loosening is solved, and the technical effect that the nut of the fastening assembly is prevented from loosening is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of fasteners, in particular to an anti-loosening fastening component. Background Art

[0002] In mechanical engineering, fastening bolts are a commonly used fastening device, widely used in various equipment and structures to connect and fix parts with through holes. Bolts usually consist of a head and a screw. The screw has an external thread and is used in conjunction with a nut to achieve locking and fastening by tightening the nut. However, in actual use, fastening bolts often face the problem of loosening.

[0003] Especially when fasteners are used for a long time or are subjected to external vibrations, nuts tend to loosen and unscrew on the screw rod. This loosening will not only lead to deterioration of the equipment's operating status, but may also cause equipment failures, or even worse, the bolts will fall off, leading to secondary equipment accidents, resulting in huge economic losses. Therefore, users need to frequently tighten the nuts again, which not only wastes a lot of time and energy for users, but also increases the cost and difficulty of equipment maintenance.

[0004] Therefore, how to provide an anti-loosening fastening assembly to improve the anti-loosening effect, reduce equipment failures and accidents caused by loose nuts, and reduce the cost and difficulty of equipment maintenance is a technical problem that technical personnel in this field currently need to solve. Utility Model Content

[0005] The utility model aims to provide an anti-loosening fastening assembly, which solves the technical problem that the nuts of the existing fastening assemblies are easy to loosen.

[0006] To achieve the above object, the utility model provides an anti-loosening fastening assembly, comprising:

[0007] A bolt, comprising a first screw rod, an end surface of the first screw rod is provided with an inwardly recessed blind hole, and an outer peripheral surface of the first screw rod is provided with a first external thread;

[0008] A second screw, wherein the top of the second screw is connected to the blind hole, the outer peripheral surface of the bottom of the second screw is provided with a second external thread, and the outer diameter of the first screw is greater than the outer diameter of the second screw;

[0009] A nut, wherein the nut is provided with a first threaded hole and a second threaded hole which are connected, wherein the inner diameter of the first threaded hole is larger than the inner diameter of the second threaded hole, and the nut cooperates with the first external thread through the first threaded hole, and cooperates with the second external thread through the second threaded hole, thereby realizing connection with the first screw and the second screw.

[0010] Preferably, a tool retreat groove is provided inside the nut, and the tool retreat groove is located between the first threaded hole and the second threaded hole.

[0011] Preferably, the width of the backing groove is greater than the inner diameter of the first threaded hole.

[0012] Preferably, the first screw rod and the second screw rod are connected by interference fit.

[0013] Preferably, a hexagonal head is provided on the top of the first screw.

[0014] Preferably, both the first external thread and the second external thread are triangular threads.

[0015] Preferably, it further comprises a gasket, which is sleeved on the first screw rod, and the bottom end of the gasket abuts against the top end of the nut.

[0016] Compared with the above-mentioned background technology, the anti-loosening fastening assembly provided by the utility model has a first screw with an outer diameter greater than that of the second screw, and thus the specifications, pitches and fitting clearances of the first external thread and the second external thread are different. When the second threaded hole of the nut and the second external thread show signs of loosening, the first threaded hole of the nut and the first external thread have a greater preload force, which will inhibit the second external thread from loosening. Conversely, if the first threaded hole of the nut and the first external thread are to be loosened, the nut needs to produce a larger amplitude, but since the fitting clearance between the second threaded hole of the nut and the second external thread is small, the amplitude increase will be effectively inhibited, thereby preventing the first external thread from loosening. This bidirectionally inhibited anti-loosening mechanism greatly improves the overall stability and reliability of the fastening assembly, thereby effectively preventing the nut from loosening from the first screw and the second screw. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0018] Figure 1 A schematic diagram of the axial side of the anti-loosening fastening assembly provided by an embodiment of the utility model;

[0019] Figure 2 A front view of an anti-loosening fastening assembly provided by an embodiment of the utility model;

[0020] Figure 3 for Figure 2 sectional view of .

[0021] in:

[0022] 1-first screw, 2-second screw, 3-nut, 4-recess, 5-hexagonal head;

[0023] 11-first external thread;

[0024] 21- Second external thread. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0027] See also Figure 1-Figure 3 The present application provides an anti-loosening fastening assembly, including a bolt, which includes a first screw rod 1, the end face of the first screw rod 1 is provided with an inwardly recessed blind hole, and the outer peripheral surface of the first screw rod 1 is provided with a first external thread 11; a second screw rod 2, the top of the second screw rod 2 is connected to the blind hole, and the bottom outer peripheral surface of the second screw rod 2 is provided with a second external thread 21, and the outer diameter of the first screw rod 1 is greater than the outer diameter of the second screw rod 2; a nut 3, the nut 3 is provided with a first threaded hole and a second threaded hole that are connected, the inner diameter of the first threaded hole is greater than the inner diameter of the second threaded hole, the nut 3 cooperates with the first external thread 11 through the first threaded hole, and cooperates with the second external thread 21 through the second threaded hole to achieve connection with the first screw 1 and the second screw 2.

[0028] That is to say, through the use of the anti-loosening fastening assembly of the present application, since the outer diameter of the first screw 1 is greater than the outer diameter of the second screw 2, and the specifications, pitches and fitting clearances of the first external thread 11 and the second external thread 21 are different, when the second threaded hole of the nut 3 and the second external thread 21 show signs of loosening, the first threaded hole of the nut 3 and the first external thread 11 have a greater preload force, which will inhibit the second external thread 21 from loosening. Conversely, if the first threaded hole of the nut 3 and the first external thread 11 are to be loosened, the nut 3 needs to produce a larger amplitude, but since the fitting clearance between the second threaded hole of the nut 3 and the second external thread 21 is small, the increase in amplitude will be effectively inhibited, thereby preventing the first external thread 11 from loosening. This two-way suppression anti-loosening mechanism greatly improves the overall stability and reliability of the fastening assembly, thereby effectively preventing the nut 3 from loosening from the first screw 1 and the second screw 2.

[0029] The present application provides a method for using an anti-loosening fastening assembly as follows: first, screw the bottom of the second screw into the upper end of the second threaded hole of the nut 3 for three to five turns; then heat the first screw 1 to expand it, and then quickly screw the first screw 1 into the first threaded hole of the nut 3, and the top end of the second screw 2 enters the blind hole of the first screw 1 until it contacts the top of the second screw 2, thereby connecting the second screw 2 to the first screw 1; after the first screw cools down and forms an interference fit with the second screw, continue to tighten the first screw 1 and drive the second screw 2 until the equipment is tightened.

[0030] Furthermore, the split design of the first external thread 11 and the second external thread 21 also brings another significant advantage: it simplifies the assembly process. In traditional bolt designs, if there are differences in pitch or thread starting position, it may cause assembly difficulties or even impossible assembly. This split design allows the first external thread 11 and the second external thread 21 to be assembled separately, thereby avoiding assembly problems caused by factors such as pitch and thread starting position. This not only improves assembly efficiency, but also reduces the error rate during assembly.

[0031] Specifically, a tool retreat groove 4 is provided inside the nut 3 , and the tool retreat groove 4 is located between the first threaded hole and the second threaded hole, thereby facilitating the processing of the first threaded hole and the second threaded hole; the width of the tool retreat groove 4 is greater than the inner diameter of the first threaded hole.

[0032] That is to say, the undercut groove 4 is located between the first threaded hole and the second threaded hole, which is convenient for machining the first threaded hole and the second threaded hole, not only improving machining efficiency, but also reducing the risk of tool damage, thereby ensuring the manufacturing quality of the nut 3. Secondly, the width of the undercut groove 4 is greater than the inner diameter of the first threaded hole, which not only further enhances the convenience of tool machining, but also can enhance the structural strength of the nut 3 to a certain extent. The wider undercut groove 4 can disperse external stress and reduce the risk of damage caused by stress concentration, thereby improving the durability and reliability of the nut 3.

[0033] The thickness of the component fastened by a specification of an anti-loosening fastening assembly of the present application is a corresponding interval value, that is, when the component is fastened, the first external thread 11 of the first screw rod 1 is located in the first threaded hole of the nut 3, and secondly, the back cutter groove 4 can also be used as a redundant space, that is, the maximum stroke of the nut 3 is when the bottom surface of the back cutter groove 4 abuts against the bottom end of the first screw rod 1.

[0034] It also includes a gasket, which is sleeved on the first screw rod 1, and the bottom end of the gasket abuts against the top end of the nut 3.

[0035] That is to say, the gasket is sleeved on the first screw rod 1, and its bottom end is tightly abutted against the top end of the nut 3. Not only the overall stability of the fastening assembly is enhanced, but also its scope of use is significantly broadened. Specifically, when the bottom surface of the backing groove 4 abuts against the bottom end of the first screw rod 1, this usually means that the component has not yet reached the ideal locking state. At this time, through the setting of the gasket, we can effectively make up for this gap and achieve a closer contact and fit between the components. In this way, not only the fastening effect of the fastening assembly is improved, but also the safety hazards caused by loose components are avoided. The introduction of the gasket not only solves the above problems, but also enables the anti-loosening fastening assembly of the present application to adapt to more different usage scenarios. Whether facing components of different specifications and sizes, or facing different fastening requirements, we can achieve the best fastening effect by adjusting the thickness and material of the gasket.

[0036] Specifically, the first screw rod 1 and the second screw rod 2 are connected by interference fit, and a hexagonal head 5 is provided on the top of the first screw rod 1 .

[0037] That is to say, the first screw 1 and the second screw 2 are connected by an interference fit to achieve a close fit between the two and ensure that the first screw 1 can drive the second screw 2 to rotate synchronously. The design principle of the interference fit is to control the fitting tolerance of the two parts so that during assembly, the size of one part is slightly larger than the corresponding size of the other part, thereby forming a certain compressive stress after assembly to achieve a close fit. In the actual assembly process, in order to reduce the difficulty of assembly and ensure the tightness of the fit, we used a heating method. First, heat the first screw 1 to expand it due to heat. Heating can increase the atomic distance between metal materials, thereby reducing the hardness of the material and facilitating assembly. At this time, the expanded first screw 1 is screwed into the nut 3 along the second screw 2 until the blind hole of the first screw 1 is in full contact with the top of the second screw 2.

[0038] If conditions permit, the nut 3 can also be heated at the same time, which can further reduce the resistance during assembly and make the assembly process smoother. After the assembly is completed, when the first screw 1 cools to room temperature, its size will return to its original state, and an interference fit will be formed between it and the second screw 2. This matching method not only ensures a close connection between the two, but also realizes the precise matching of the threads between the first screw 1, the second screw 2 and the nut 3.

[0039] In addition, a hexagonal head 5 is provided on the top of the first screw rod 1, which facilitates the operator to use tools such as a wrench or a screwdriver to rotate the first screw rod 1, thereby realizing the assembly and disassembly of the entire fastening assembly.

[0040] Specifically, the first external thread 11 and the second external thread 21 are both triangular threads.

[0041] That is to say, both the first external thread 11 and the second external thread 21 are designed as triangular threads, which have a stable structure, excellent load-bearing capacity and good self-locking performance. Therefore, setting the first external thread 11 and the second external thread 21 as triangular threads can ensure that both can provide a stable and reliable connection effect when they are matched with their threaded holes. Secondly, since the first external thread 11 and the second external thread 21 are different in specifications and sizes, the same triangular thread shape is used to help achieve their precise matching with the corresponding components. At the same time, the characteristics of the triangular thread can also help reduce friction and resistance during assembly, making the assembly process smoother and improving assembly efficiency. In addition, the triangular thread also has good sealing performance, which helps to prevent loosening and falling off. By using triangular threads, we can effectively improve the stability and reliability of the entire assembly and ensure that it can maintain a good connection state in various harsh environments.

[0042] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0043] This article uses specific examples to illustrate the principle and implementation of an anti-loosening fastening assembly provided by the utility model. The description of the above embodiments is only used to help understand the method and core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. An anti-loosening fastening assembly, characterized in that: include: A bolt, comprising a first screw rod (1), an end surface of the first screw rod (1) being provided with an inwardly recessed blind hole, and an outer peripheral surface of the first screw rod (1) being provided with a first external thread (11); a second screw (2), wherein the top of the second screw (2) is connected to the blind hole, the outer peripheral surface of the bottom of the second screw (2) is provided with a second external thread (21), and the outer diameter of the first screw (1) is greater than the outer diameter of the second screw (2); A nut (3), wherein the nut (3) is provided with a first threaded hole and a second threaded hole which are connected to each other, wherein the inner diameter of the first threaded hole is larger than the inner diameter of the second threaded hole, and the nut (3) cooperates with the first external thread (11) through the first threaded hole, and cooperates with the second external thread (21) through the second threaded hole, thereby achieving connection with the first screw rod (1) and the second screw rod (2).

2. The anti-loosening fastening assembly according to claim 1, characterized in that: A tool retreat groove (4) is provided inside the nut (3), and the tool retreat groove (4) is located between the first threaded hole and the second threaded hole.

3. The anti-loosening fastening assembly according to claim 2, characterized in that: The width of the tool retreat groove (4) is greater than the inner diameter of the first threaded hole.

4. The anti-loosening fastening assembly according to claim 1, characterized in that: The first screw rod (1) and the second screw rod (2) are connected by interference fit.

5. The anti-loosening fastening assembly according to claim 1, characterized in that: A hexagonal head (5) is provided on the top of the first screw (1).

6. The anti-loosening fastening assembly according to claim 1, characterized in that: The first external thread (11) and the second external thread (21) are both triangular threads.

7. The anti-loosening fastening assembly according to any one of claims 1 to 6, characterized in that: It also comprises a gasket, which is sleeved on the first screw rod (1), and the bottom end of the gasket abuts against the top end of the nut (3).

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