Conical face combination lock nut

Abstract

This invention relates to the field of anti-loosening nuts, and discloses a conical composite anti-loosening nut, including an outer nut and an inner nut. The inner wall of the outer nut has an internal hexagonal groove, which is conical in shape with one end smaller than the other. The outer wall of the inner nut is adapted to the inner wall of the internal hexagonal groove, and the inner nut is also conical in shape with one end smaller than the other. A regular nut is provided on one side of the outer nut, and a bolt is threaded onto the inner wall of the regular nut. A workpiece is placed between the regular nut and the bolt. In use, it is used in combination with the regular nut, instead of being used alone. When tightening the workpiece, the regular nut is used to ensure axial clamping force. Then, the anti-loosening nut is added to lock it with the same torque to achieve the purpose of preventing loosening. This achieves the goal of the anti-loosening nut only participating in preventing loosening without changing the original structure of the fastener. The conical composite anti-loosening nut obtains a smaller axial force and a stronger locking force than the regular nut through the same torque value.

Description

Technical Field

[0001] This invention relates to the field of anti-loosening nut technology, specifically a conical composite anti-loosening nut. Background Technology

[0002] A lock nut is a device used to prevent a nut from loosening on its own. Through its special structure and working principle, it can be firmly fixed to a bolt, preventing the nut from loosening due to vibration.

[0003] The locking principle of the conical combination anti-loosening nut: In actual use, first tighten the workpiece with a regular nut or bolt to obtain the predetermined axial force. Then screw the conical combination anti-loosening nut on top of the regular nut, with the same torque value as tightening the regular nut. When tightening the conical combination anti-loosening nut, the inner nut moves downwards simultaneously and contracts through the inner hexagonal conical surface of the outer nut to grip the stud, generating a radial locking force.

[0004] Ordinary nuts provide reliable axial force, but their radial locking force is too small, making them prone to loosening. To address this, we propose a conical combination anti-loosening nut. Summary of the Invention

[0005] The purpose of this invention is to provide a conical composite anti-loosening nut to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a conical combination anti-loosening nut, comprising an outer nut and an inner nut. The inner wall of the outer nut has an internal hexagonal groove, which is a conical structure with one end smaller than the other. The outer wall of the inner nut is adapted to the inner wall of the internal hexagonal groove. The inner nut is also a conical structure with one end smaller than the other. The smaller end of the inner nut is adapted to the smaller end of the internal hexagonal groove, and the larger end of the inner nut is adapted to the larger end of the internal hexagonal groove. A common nut is provided on one side of the outer nut, and a bolt is threaded onto the inner wall of the common nut. A workpiece is placed between the common nut and the bolt.

[0007] Preferably, the outer nut has a through hole that communicates with the internal hexagonal groove.

[0008] Preferably, the inner wall of the inner nut is provided with an internal thread, and the internal thread is configured to be threadedly connected to the bolt.

[0009] Preferably, an anti-loosening groove is provided through one side of the inner nut, and rounded corners are provided at the hexagonal corners on the outer side of the inner nut.

[0010] Compared with the prior art, the beneficial effects of the present invention are: This invention is used in combination with ordinary nuts, instead of alone. When fastening workpieces, ordinary nuts are used to ensure axial clamping force. Then, a lock nut is added and tightened with the same torque to prevent loosening. This ensures that the lock nut only participates in preventing loosening without changing the original fastener structure. The conical combination lock nut achieves a smaller axial force and stronger locking force than ordinary nuts through the same torque value. The reliable radial force of ordinary nuts and the strong radial locking force of conical combination lock nuts complement each other, forming a perfect combination that completely solves the problem of ordinary nuts loosening. Attached Figure Description

[0011] Figure 1 A schematic diagram showing the outer and inner nuts of a conical composite lock nut structure; Figure 2 This is a schematic diagram of the overall structure of the present invention when used in combination with a common nut; Figure 3 This is a left view schematic diagram of the structure of the outer nut of the present invention; Figure 4 This is a schematic cross-sectional view of the structure of the outer nut of the present invention; Figure 5 This is a left-side view of the structure of the inner nut of the present invention; Figure 6 This is a schematic diagram of one side of the structure of the inner nut of the present invention.

[0012] In the diagram: 1. Outer nut; 2. Inner nut; 3. Socket hexagonal groove; 4. Ordinary nut; 5. Bolt; 6. Workpiece; 101. Through hole; 201. Internal thread; 202. Anti-loosening groove. Detailed Implementation

[0013] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0014] Please see Figures 1-6The present invention provides a technical solution: a conical combination anti-loosening nut, including an outer nut 1 and an inner nut 2. The inner wall of the outer nut 1 is provided with an internal hexagonal groove 3, which is a conical structure with one end smaller than the other. The outer wall of the inner nut 2 is adapted to the inner wall of the internal hexagonal groove 3. The inner nut 2 is also a conical structure with one end smaller than the other. The smaller end of the inner nut 2 is adapted to the smaller end of the internal hexagonal groove 3, and the larger end of the inner nut 2 is adapted to the larger end of the internal hexagonal groove 3. A common nut 4 is provided on one side of the outer nut 1. A bolt 5 is threadedly connected to the inner wall of the common nut 4. A workpiece 6 is provided between the common nut 4 and the bolt 5.

[0015] Furthermore, it is used in combination with ordinary nut 4, instead of being used alone. Ordinary nut 4 is used to ensure axial clamping force when fastening workpiece 6. Then, a lock nut is added and tightened with the same torque to prevent loosening. This achieves the goal of the lock nut only participating in preventing loosening without changing the original fastener structure. The conical combination lock nut, with the same torque value as ordinary nut 4, obtains a smaller axial force and a stronger locking force than ordinary nut 4. The reliable radial force of ordinary nut 4 and the strong radial locking force of the conical combination lock nut complement each other, forming a perfect combination that completely solves the problem of ordinary nut 4 loosening.

[0016] In the preferred embodiment of this technical solution, please refer to Figure 4 As shown, the outer nut 1 has a through hole 101 that communicates with the internal hexagonal groove 3.

[0017] In the preferred embodiment of this technical solution, please refer to Figure 5 As shown, the inner wall of the inner nut 2 has an internal thread 201, which is threadedly connected to the bolt 5.

[0018] In the preferred embodiment of this technical solution, please refer to Figure 6 As shown, an anti-loosening groove 202 is provided through one side of the inner nut 2, and rounded corners are provided at the hexagonal corners on the outer side of the inner nut 2.

[0019] Working principle: Preliminary tightening stage: First, pass the bolt 5 through the reserved hole of the workpiece 6 to ensure that the workpiece 6 is accurately positioned; screw the ordinary nut 4 into the bolt 5, and use a torque wrench to tighten the ordinary nut 4 according to the preset torque value, so that the ordinary nut 4 fits tightly against the surface of the workpiece 6, providing a stable axial clamping force, and firmly fixing the workpiece 6 in the preset position to complete the basic tightening. At this time, the ordinary nut 4 bears the main axial load and ensures the assembly accuracy of the workpiece 6.

[0020] During the assembly of the anti-loosening nut: Screw the assembled outer nut 1 and inner nut 2 into the bolt 5 as a whole, so that one end of the outer nut 1 is in contact with the surface of the ordinary nut 4; continue to use the same torque wrench as the one used to tighten the ordinary nut 4, and tighten the outer nut 1 with the same torque value, so that the outer nut 1 drives the inner nut 2 to move along the thread of the bolt 5 toward the ordinary nut 4.

[0021] Conical locking and anti-loosening stage: As the outer nut 1 continues to tighten, the inner nut 2 moves further toward the ordinary nut 4 under the drive of the bolt 5 thread. Since both the inner nut 2 and the internal hexagonal groove 3 are conical structures and their sizes are compatible, the internal hexagonal groove 3 generates a radial compressive force on the inner nut 2. Under the action of radial compressive force, the inner nut 2 undergoes elastic contraction through the anti-loosening groove 202, causing the inner wall thread 201 to tightly engage with the bolt 5 thread, forming a strong radial locking force, filling the gap between the threads, and preventing the inner nut 2 and bolt 5 from rotating relative to each other. At the same time, a large static friction force is generated between the conical mating surfaces, further hindering the loosening tendency caused by vibration. At this time, the axial clamping force of the ordinary nut 4 and the radial locking force of the anti-loosening nut complement each other, forming a double anti-loosening effect.

[0022] Operating conditions and anti-loosening maintenance stage: During equipment operation or workpiece 6 under stress and vibration, the vibration energy attempts to drive the ordinary nut 4 and bolt 5 to rotate relative to each other, thus causing loosening; while the radial locking force of the conical combination anti-loosening nut ensures that the inner nut 2 and bolt 5 threads are always tightly engaged, the anti-loosening groove 202 can buffer and absorb some vibration energy, reducing the impact of vibration on the thread mating surface; the static friction of the conical mating surface can effectively resist the loosening torque caused by vibration, prevent the inner nut 2 from shifting, thereby ensuring the stability of the entire fastening structure and completely solving the problem of loosening of the ordinary nut 4.

[0023] It should be noted that, in this document, relational terms such as "first" and "second" are used only 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 process, method, article, or apparatus.

[0024] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A conical combination anti-loosening nut, comprising an outer nut (1) and an inner nut (2), characterized in that: The inner wall of the outer nut (1) is provided with an internal hexagonal groove (3). The internal hexagonal groove (3) is a conical structure with one end smaller than the other end. The outer wall of the inner nut (2) is adapted to the inner wall of the internal hexagonal groove (3). The inner nut (2) is a conical structure with one end smaller than the other end. The smaller end of the inner nut (2) is adapted to the smaller end of the internal hexagonal groove (3). The larger end of the inner nut (2) is adapted to the larger end of the internal hexagonal groove (3). A common nut (4) is provided on one side of the outer nut (1). A bolt (5) is threaded on the inner wall of the common nut (4). A workpiece (6) is provided between the common nut (4) and the bolt (5).

2. The conical combined anti-loosening nut according to claim 1, characterized in that: The outer nut (1) has a through hole (101) that communicates with the internal hexagonal groove (3).

3. The conical combined anti-loosening nut according to claim 1, characterized in that: The inner nut (2) has an internal thread (201) on its inner wall, and the internal thread (201) is threadedly connected to the bolt (5).

4. The conical combined anti-loosening nut according to claim 1, characterized in that: The inner nut (2) has a through-hole (202) on one side, and the hexagonal corners on the outer side of the inner nut (2) are rounded.

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