Self-locking nut

Abstract

The invention belongs to the field of nut design, and particularly relates to a self-locking nut which comprises a nut section, a reinforcing section and a connecting section. A first thread is arranged in the nut section, a second thread is arranged in the reinforcing section, and the connecting section is arranged between the nut section and the reinforcing section; the connecting section is of an arc-shaped structure with an opening in one side; a gap is formed between the first thread and the second thread; local threads are arranged on the inner wall of the connecting section and connected with the first threads and the second threads. The first thread and the second thread are not independent from each other through the local thread, after the bolt is screwed in, the two sections of threads need to be broken through in the vibration loosening process of the nut in the engine test flight environment, the local thread can generate corresponding deformation in the screwing-in process, and the two sections of threads cannot be screwed out in the same angular direction at the same time without the participation of an external tool. In other words, in the using process, the anti-loosening function can be achieved through deformation of the nut in the assembling pre-tightening state.

Description

Technical Field

[0001] The present invention relates to the field of nut design, and in particular to a self-locking nut. Background Art

[0002] The threaded fasteners used in aircraft engine structural connections are exposed to harsh vibration environments, and locking safety measures must be taken to prevent the fasteners from loosening and causing connection failure.

[0003] Traditionally, fuses / lock wires are mainly used to bind bolts and nuts together, such as Figure 1 , thereby inhibiting thread loosening. Production practice experience shows that this measure is complicated to operate, takes up a lot of man-hours in the assembly and disassembly process, and is inefficient; it also has directional requirements, relies on manual experience and responsibility, and is prone to errors. Another commonly used anti-loosening method is the closed-end self-locking nut, such as Figure 2 The nut is deformed by a closing operation, which then engages the bolt's external threads. This type of self-locking nut requires high-tech processing, is prone to dimensional deviations, and requires different tooling for different thread sizes. Furthermore, closed-end self-locking nuts have a limited number of uses, and after repeated assembly, they lose their self-locking function.

[0004] The currently common self-locking nuts have the following disadvantages:

[0005] 1. The end deformation processing is required, which has high requirements on the process and is prone to out-of-tolerance parts. In addition, special tools need to be prepared for different specifications of threads;

[0006] 2. The thread deformation after leaving the factory is permanent deformation, which has obvious restrictions on the number of times the thread can be used. Repeated assembly will cause the thread to lose its self-locking function.

[0007] Therefore, how to simply and effectively ensure the self-locking performance of the nut is a problem that needs to be solved. Summary of the Invention

[0008] The purpose of the present application is to provide a self-locking nut to solve the problem of complex processing or short service life of self-locking nuts in the prior art.

[0009] The technical solution of the present application is: a self-locking nut, comprising a nut section, a reinforcement section and a connecting section; a first thread is provided in the nut section, a second thread is provided in the reinforcement section, and the connecting section is provided between the nut section and the reinforcement section; the connecting section is an arc-shaped structure with an open side; there is a gap between the first thread and the second thread; a local thread is provided on the inner wall of the connecting section, the local thread is connected to the first thread and the second thread, the threads of the first thread, the second thread and the local thread are the same, and the screwed-in bolt needs to break through the first thread and the second thread before it can be withdrawn.

[0010] Preferably, the nut segment, the reinforcement segment and the connection segment are all subjected to material removal before thread processing.

[0011] Preferably, the connecting section is in the shape of a cone section, a column section or a step section.

[0012] Preferably, the reinforcement section is cylindrical in shape.

[0013] Preferably, the nut segment, reinforcement segment and connection segment are integrally formed and made of the same material.

[0014] Preferably, the first thread and the second thread are both complete circumferential threads after leaving the factory.

[0015] The self-locking nut of this application uses a partial thread to make the first and second threads independent of each other. After the bolt is screwed in, the nut needs to break through the two threads during the vibration loosening process under the engine test and flight test environment. The partial thread will deform accordingly during the screwing process. Without the intervention of external tools, the two threads cannot be unscrewed at the same angle at the same time. In other words, the self-locking nut can achieve its anti-loosening function only by relying on the deformation of the nut itself in the pre-tightened state during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions provided by this application, the following is a brief introduction to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of this application.

[0017] Figure 1 A schematic diagram of a nut structure using a fuse / lock wire in the background art;

[0018] Figure 2 It is a schematic diagram of the structure of a closed-end self-locking nut in the background technology;

[0019] Figure 3 A is a cross-sectional view of the overall structure of this application;

[0020] Figure 3 B is the axonometric drawing of the overall structure of this application;

[0021] Figure 4 This is a partial cross-sectional diagram of the connecting section of this application.

[0022] 1. Nut section; 2. Reinforcement section; 3. Connecting section; 4. First thread; 5. Second thread; 6. Partial thread. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0024] A self-locking nut, as Figure 3 shown in Figures A and 3B, includes a nut section 1, a reinforcing section 2 and a connecting section 3; a first thread 4 is provided in the nut section 1, a second thread 5 is provided in the reinforcing section 2, and the connecting section 3 is disposed between the nut section 1 and the reinforcing section 2; the connecting section 3 is an arc-shaped structure with one side open; there is a gap between the first thread 4 and the second thread 5; a partial thread 6 is provided on the inner wall of the connecting section 3, and the partial thread 6 is connected to the first thread 4 and the second thread 5, and the first thread 4, the second thread 5 and the partial thread 6 have the same thread, and the bolt to be screwed in needs to break through the first thread 4 and the second thread 5 to be withdrawn.

[0025] The partial thread 6 makes the first thread 4 and the second thread 5 not independent of each other. After the bolt is screwed in, during the process of the nut vibrating and loosening in the engine test flight environment, it needs to break through the two threads. The partial thread 6 will produce corresponding deformation during the screwing-in process. Without the participation of external tools, the two threads cannot be simultaneously unscrewed in the same angular direction. That is, during its use, the anti-loosening function can be realized only by relying on the deformation of the nut itself in the assembled pre-tightened state.

[0026] Preferably, the nut section 1, the reinforcing section 2 and the connecting section 3 are all subjected to material removal before thread machining to ensure that the threads are complete circumferential threads and can avoid the influence of material cutting on the threads.

[0027] Preferably, the shape of the connecting section 3 can be a tapered section, a cylindrical section, a stepped section and other various structural forms. The specific dimensional limitation requirements are that it can achieve thread self-locking and will not cause cracks and other forms of damage during the service state due to excessive material cutting. The cross-sectional view of the cylindrical section is as Figure 4 shown.

[0028] Preferably, the shape of the reinforcing section 2 is cylindrical, and the outer diameter of the reinforcing section 2 is connected to the midpoint of the straight edge of the nut section 1 to ensure structural stability.

[0029] Preferably, the nut section 1, the reinforcing section 2 and the connecting section 3 are integrally formed and made of the same material for convenient processing and manufacturing.

[0030] Preferably, the first thread 4 and the second thread 5 are both complete circumferential threads after leaving the factory to enable repeated assembly.

[0031] The self-locking nut of the present application, compared with traditional self-locking nuts, does not require a process of closing the mouth, which can reduce the processing difficulty and reject rate of the nut; its thread after leaving the factory is still a complete circumferential thread, and it only relies on the deformation of the nut itself during use to achieve the anti-loosening function, and no permanent deformation will occur during the factory stage, enabling multiple repeated assemblies.

[0032] The wrench platform is not the key point protected by the present application and can be designed into various specifications such as hexagon, decagon, and dodecagon as required.

[0033] The whole has the following advantages:

[0034] 1. It does not require a deformation processing step, reducing the processing difficulty and reject rate of the nut;

[0035] 2. The thread after leaving the factory is a complete circumferential thread, and it only relies on the deformation of the nut itself in the pre-tightened state during assembly to achieve the anti-loosening function during use, and no permanent deformation will occur during the factory stage, enabling multiple repeated assemblies.

[0036] Finally, it should be noted that: in the accompanying drawings of the disclosed embodiments of the present invention, only the structures related to the disclosed embodiments are involved. Other structures can refer to the general design. Without conflict, the same embodiment and different embodiments of the present invention can be combined with each other;

[0037] Finally: The above are only the preferred embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A self-locking nut, characterized in that: It includes a nut section (1), a strengthening section (2) and a connecting section (3); a first thread (4) is provided inside the nut section (1), a second thread (5) is provided inside the strengthening section (2), and the connecting section (3) is arranged between the nut section (1) and the strengthening section (2); the connecting section (3) is of an arc-shaped structure with one side open; there is a gap between the first thread (4) and the second thread (5); a partial thread (6) is provided on the inner wall of the connecting section (3), and the partial thread (6) is connected to the first thread (4) and the second thread (5), and the first thread (4), the second thread (5) and the partial thread (6) have the same thread, and the bolt to be screwed in needs to break through the first thread (4) and the second thread (5) to be withdrawn.

2. The self-locking nut according to claim 1, characterized in that: The nut section (1), the strengthening section (2) and the connecting section (3) are all subjected to material removal before thread machining.

3. The self-locking nut according to claim 1, wherein: The shape of the connecting section (3) is a tapered section, a cylindrical section or a stepped section.

4. The self-locking nut according to claim 1, characterized in that: The shape of the strengthening section (2) is cylindrical.

5. The self-locking nut according to claim 1, characterized in that: The nut section (1), the strengthening section (2) and the connecting section (3) are integrally formed and made of the same material.

6. The self-locking nut according to claim 1, wherein: Both the first thread (4) and the second thread (5) are complete circumferential threads after leaving the factory.

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