Self-locking two-way anti-loosening nut

Abstract

This utility model discloses a self-locking bidirectional anti-loosening nut, belonging to the field of fastener technology. The nut includes a rotating nut and a rotating button fixed on its top. An anti-loosening mechanism is provided in the internal receiving cavity of the rotating nut. The anti-loosening mechanism includes an anti-loosening ring, a nylon ring, and an anti-loosening ring stacked in sequence; the end face of the anti-loosening ring is provided with radial patterns, and the anti-loosening ring is fixed to the inner wall of the receiving cavity to axially limit the nylon ring. The nylon ring is clamped between the anti-loosening ring and the anti-loosening ring. This utility model achieves dual synergistic anti-loosening through the radial elastic locking formed by the nylon ring on the threaded rod and the axial friction locking formed by the radial patterns of the anti-loosening ring and the component to be connected. It solves the problem that the existing single anti-loosening structure is prone to failure under complex vibration and impact, and has the beneficial effects of compact structure, convenient installation, and high anti-loosening reliability.

Description

Technical Field

[0001] This utility model relates to the field of self-locking nut technology, and in particular to a self-locking bidirectional anti-loosening nut. Background Technology

[0002] In modern mechanical equipment and engineering structures, threaded connections are one of the most basic and widely used connection methods. Through the cooperation of bolts and nuts, various components are fastened into a reliable whole. The reliability of threaded connections is directly related to the safe and stable operation of the entire equipment or structure.

[0003] However, in real-world working environments, especially when machinery is subjected to continuous vibration, impact loads, or alternating temperature changes, the friction between threaded parts gradually decreases or even disappears. This phenomenon can cause the nut to rotate unintentionally, leading to a decrease in preload and ultimately causing the connection to loosen. Loosening of the connection not only affects the operating accuracy and efficiency of the equipment, but in critical applications, it can even cause serious mechanical failures and safety accidents.

[0004] To overcome the problem of loosening in threaded connections, various anti-loosening technologies have been developed. One common method is to use non-metallic insert lock nuts, such as nylon lock nuts. The principle is to embed a nylon ring inside the nut. When the bolt is tightened, the nylon ring is elastically deformed by the thread compression, thereby applying a continuous radial pressure to the bolt and increasing the friction between the threaded parts to prevent loosening. While this method has some effect, its anti-loosening capability mainly relies on the single radial elastic locking force of the nylon ring.

[0005] In more demanding or complex operating conditions, such as environments with both high-frequency vibration and significant impact, relying solely on radial elastic locking force may be insufficient to provide long-term, stable anti-loosening protection. Continuous dynamic loads may gradually fatigue the elasticity of nylon, or under sudden, massive impacts, its locking torque may still be overcome, making it difficult to meet higher requirements for anti-loosening reliability. Current technology lacks an integrated nut structure that can provide stronger and more durable locking force through the synergistic action of multiple principles.

[0006] Therefore, this utility model proposes a self-locking bidirectional anti-loosening nut to overcome the shortcomings of the prior art. Utility Model Content

[0007] In view of the problems that the single anti-loosening method in the existing threaded connection structure is prone to weakening of anti-loosening effect and insufficient connection reliability under long-term vibration and impact conditions, this utility model aims to provide a self-locking bidirectional anti-loosening nut with an improved structure that can effectively solve the above problems.

[0008] This utility model provides a self-locking bidirectional anti-loosening nut, including a threaded rod, a rotating nut, a rotating button, an anti-loosening mechanism, an anti-loosening ring, a nylon ring, and an anti-loosening ring ring.

[0009] The threaded rod has an external threaded connection to a rotating nut, and a rotating button is fixedly connected to the top of the rotating nut. An integrally formed stepped receiving chamber is formed inside the rotating nut along its axial direction. An anti-loosening mechanism is installed within the receiving chamber of the rotating nut, including an anti-loosening ring, a nylon ring, and an anti-loosening collar.

[0010] The anti-loosening ring, nylon ring, and anti-loosening collar are all coaxially arranged and stacked sequentially within the receiving cavity of the rotating nut, forming a composite locking structure. The anti-loosening ring abuts against the bottom stepped surface of the receiving cavity, and its end face facing the component to be connected has radial patterns. The anti-loosening collar is fixed to the top inner wall of the receiving cavity by a snap-fit ​​mechanism, and limits the axial position of the nylon ring. The nylon ring is clamped and fixed between the anti-loosening ring and the anti-loosening collar, and its inner wall is designed to elastically abut against the threads of the threaded rod after tightening.

[0011] Preferably, the rotary button has a cylindrical structure, and its outer peripheral surface is knurled to increase friction.

[0012] Preferably, an annular groove is formed on the top inner wall of the receiving chamber of the rotating nut, and the outer peripheral edge of the anti-loosening ring is engaged in the annular groove to achieve its firm axial fixation.

[0013] Preferably, the radial pattern of the anti-loosening ring is a serrated ridge radiating from its central through hole to the outer peripheral edge.

[0014] Preferably, the nylon ring is made of polyamide material, and its inner diameter is smaller than the major diameter of the threaded rod thread in the free state.

[0015] Preferably, the axial thickness of the nylon ring in its natural state within the receiving cavity is slightly greater than the vertical distance between the lower end face of the anti-loosening ring used for limiting and the upper end face of the anti-loosening ring used for bearing, so that the nylon ring is in a pre-compressed state after assembly.

[0016] Preferably, the anti-loosening ring is a flat washer made of metal, with a hardness lower than the surface hardness of the parts to be connected, so as to ensure that the radial pattern can produce a slight embedding effect when tightened.

[0017] Preferably, the rotating nut and the rotating button are integrally injection molded.

[0018] This utility model has the following beneficial effects: 1. This utility model integrates an anti-loosening mechanism with an anti-loosening ring and a nylon ring working together inside the rotating nut, which simultaneously achieves radial elastic locking and axial friction locking. This solves the problem that the single anti-loosening structure in the prior art is not reliable enough and is easy to loosen under vibration and impact conditions, and achieves the technical effect of double synergistic locking and significant anti-loosening effect.

[0019] 2. This utility model solves the problem that the anti-loosening connection in the prior art often requires the cooperation of multiple independent parts, resulting in complicated assembly, low efficiency and easy loss of parts, by integrating the anti-loosening ring, nylon ring and anti-loosening ring into the internal cavity of the rotating nut. It achieves the technical effect of compact structure, high integration, simple and quick installation and reduced assembly error rate.

[0020] 3. This utility model solves the problem that ordinary nuts or washers have smooth contact surfaces and limited friction, making it difficult to effectively resist the rotational torque caused by vibration by setting radial patterns on the end face of the anti-loosening ring. It achieves the technical effect of greatly increasing the static friction force on the contact surface with the parts to be connected under the action of axial preload, forming a reliable axial mechanical lock, and effectively preventing the nut from rotating. Attached Figure Description

[0021] Figure 1 This is a three-dimensional schematic diagram of the self-locking bidirectional anti-loosening nut proposed in this utility model; Figure 2 This is a schematic diagram of the anti-loosening ring of the self-locking bidirectional anti-loosening nut proposed in this utility model; Figure 3 This is a schematic diagram of the anti-loosening ring of the self-locking bidirectional anti-loosening nut proposed in this utility model; Figure 4 for Figure 2 Enlarged view of point A in the middle.

[0022] Legend: 1. Rotary button; 2. Threaded rod; 3. Anti-loosening mechanism; 31. Rotating nut; 32. Anti-loosening ring; 33. Anti-loosening ring; 34. Nylon ring. Detailed Implementation

[0023] Example: Reference Figures 1 to 4 This utility model provides a self-locking bidirectional anti-loosening nut, which aims to solve the problem that existing threaded connection structures are prone to rotational loosening under vibration or impact conditions, resulting in reduced connection reliability.

[0024] like Figure 1As shown, the overall structure of the self-locking bidirectional anti-loosening nut includes a threaded rod 2 with a central thread and a rotating nut 31 that is threaded to the outside of the threaded rod 2. A rotating button 1 is fixedly connected to the top of the rotating nut 31. An integrally formed stepped receiving chamber is formed inside the rotating nut 31 along its axial direction. The receiving chamber contains an anti-loosening mechanism 3, which is the core innovative structure. The anti-loosening mechanism 3 includes an anti-loosening ring 32, a nylon ring 34, and an anti-loosening ring 33. The anti-loosening ring 32, the nylon ring 34, and the anti-loosening ring 33 are all coaxially arranged and stacked sequentially. The rotating nut 31 and its receiving chamber together form a composite double locking structure. Specifically, the anti-loosening ring 32 abuts against the bottom stepped surface of the receiving chamber, serving as the bearing base of the entire anti-loosening mechanism 3. The anti-loosening ring 33 is fixed to the top inner wall of the receiving chamber by snap-fit, which is used to form a firm axial limit on the nylon ring 34 inside. The nylon ring 34 is stably clamped and fixed between the anti-loosening ring 32 and the anti-loosening ring 33. Its inner wall is used to form a tight elastic abutment with the thread of the threaded rod 2 after tightening. At the same time, its whole will squeeze the anti-loosening ring 32 after being subjected to axial pressure.

[0025] Reference Figure 2 , Figure 3 and Figure 4 The anti-loosening ring 32 in the anti-loosening mechanism 3 is a flat metal washer, such as... Figure 2 and Figure 4 As shown, the end face of the anti-loosening ring 32 facing the component to be connected is machined with radial patterns. The radial patterns are serrated protrusions radiating from its central through hole to the outer peripheral edge. The hardness of the anti-loosening ring 32 is lower than the surface hardness of the component to be connected, so as to ensure that the radial patterns can produce a slight embedding effect when tightened. The anti-loosening ring 33 in the anti-loosening mechanism 3 is a retaining ring for axial limiting. In the assembled state, an annular groove is opened on the top inner wall of the receiving chamber of the rotating nut 31, and the outer peripheral edge of the anti-loosening ring 33 is exactly engaged in the annular groove. This ensures its secure axial fixation within the receiving cavity. The nylon ring 34 is made of polyamide material, and its inner diameter in the free state is smaller than the major diameter of the threaded rod 2. Furthermore, the axial thickness of the nylon ring 34 in its natural state within the receiving cavity is slightly greater than the vertical distance between the lower end face of the anti-loosening ring 33 used for limiting and the upper end face of the anti-loosening ring 32 used for bearing. This dimensional fit ensures that the nylon ring 34 remains in a pre-compressed state after being limited and fixed by the anti-loosening ring 33, and applies a continuous axial pressure to the anti-loosening ring 32.

[0026] As a preferred embodiment, in order to facilitate the user to apply torque for tightening, the rotary button 1 is specifically a cylindrical structure, and its outer peripheral surface is processed with knurling to increase friction. As another preferred embodiment, in order to ensure the reliability of the anti-loosening ring 33, an annular groove is provided on the top inner wall of the receiving chamber of the rotating nut 31, and the outer peripheral edge of the anti-loosening ring 33 is precisely engaged in the annular groove to achieve its firm axial fixation. As another preferred embodiment, in order to further enhance the frictional locking effect between the anti-loosening ring 32 and the contact surface of the component to be connected, the radial pattern of the anti-loosening ring 32 is specifically a serrated protrusion radiating from its central through hole to the outer peripheral edge. As another preferred embodiment, in order to ensure that the nylon ring 34 has excellent elasticity and wear resistance and can form a reliable radial lock with the thread of the threaded rod 2, the material of the nylon ring 34 is preferably polyamide, and its inner diameter is smaller than the major diameter of the thread of the threaded rod 2 in the free state. As another preferred embodiment, in order to generate pre-tightening force in the nylon ring 34 after assembly, the axial thickness of the nylon ring 34 in its natural state in the receiving cavity is slightly greater than the vertical distance between the lower end face of the anti-loosening ring 33 used for limiting and the upper end face of the anti-loosening ring 32 used for bearing, so that the nylon ring 34 is in a pre-compressed state after assembly. As another preferred embodiment, in order to enable the radial pattern of the anti-loosening ring 32 to be more effectively embedded into the surface of the parts to be connected, the anti-loosening ring 32 is made of metal and its hardness is lower than the surface hardness of the parts to be connected, so as to ensure that the radial pattern can produce a slight embedding effect when tightened. As another preferred embodiment, in order to simplify the production process and improve the strength of the overall structure, the rotating nut 31 and the rotating button 1 are integrally injection molded.

[0027] The working principle is as follows: During installation and use, align the rotating nut 31 with the threaded rod 2, and operate the rotating button 1 to screw the rotating nut 31 into the thread of the threaded rod 2 until the anti-loosening ring 32 at its bottom is tightly fitted with the surface of the part to be connected. During this process, the thread of the threaded rod 2 will cut into and squeeze the inner wall of the nylon ring 34. Since the inner diameter of the nylon ring 34 is smaller than the major diameter of the thread of the threaded rod 2 and it is elastic, the nylon ring 34 will generate a continuous and strong radial clamping force on the thread of the threaded rod 2, thereby forming the first locking between the threaded pairs, namely elastic locking.

[0028] When the rotating nut 31 is tightened further, a huge axial preload is generated. This preload is transmitted to the anti-loosening ring 32 through the bottom of the stepped receiving chamber of the rotating nut 31, pressing the anti-loosening ring 32 against the surface of the component to be connected. The radial texture on the end face of the anti-loosening ring 32 will generate a large static friction with the surface of the component to be connected, and even produce a slight embedding effect, thus forming a second locking, namely friction locking. At the same time, the axial preload further compresses the nylon ring 34, which is limited by the anti-loosening ring 33, enhancing the radial clamping effect of the nylon ring 34 on the threaded rod 2. Through the dual synergistic effect of the radial elastic locking provided by the nylon ring 34 and the axial friction locking provided by the anti-loosening ring 32, this utility model effectively solves the problem that the single anti-loosening method in the prior art is prone to failure under vibration and impact, ensuring the long-term reliability of the threaded connection.

Claims

1. A self-locking bidirectional anti-loosening nut, comprising a threaded rod (2) with a central thread, wherein a rotating nut (31) is externally threaded onto the threaded rod (2); a rotating button (1) is fixedly connected to the top of the rotating nut (31), and an integrally formed stepped receiving chamber is formed inside the nut along its axial direction; characterized in that, The receiving cavity of the rotating nut (31) is provided with an anti-loosening mechanism (3); the anti-loosening mechanism (3) includes an anti-loosening ring (32), a nylon ring (34) and an anti-loosening ring (33), the anti-loosening ring (32), the nylon ring (34) and the anti-loosening ring (33) are all coaxially arranged and stacked in sequence in the receiving cavity; the anti-loosening ring (32) abuts against the bottom step surface of the receiving cavity, and its end face facing the component to be connected is provided with radial patterns; the anti-loosening ring (33) is fixed to the top inner wall of the receiving cavity by snap-fit, and limits the axial position of the nylon ring (34); the nylon ring (34) is clamped and fixed between the anti-loosening ring (32) and the anti-loosening ring (33).

2. The self-locking bidirectional anti-loosening nut according to claim 1, characterized in that, The rotary button (1) has a cylindrical structure and its outer circumferential surface is knurled to increase friction.

3. The self-locking bidirectional anti-loosening nut according to claim 1, characterized in that, An annular groove is provided on the top inner wall of the receiving chamber of the rotating nut (31), and the outer peripheral edge of the anti-loosening ring (33) is precisely engaged in the annular groove to achieve its firm axial fixation.

4. The self-locking bidirectional anti-loosening nut according to claim 1, characterized in that, The radial pattern of the anti-loosening ring (32) consists of serrated protrusions radiating from its central through hole to the outer peripheral edge.

5. The self-locking bidirectional anti-loosening nut according to claim 1, characterized in that, The nylon ring (34) is made of polyamide material and its inner diameter is smaller than the major diameter of the thread of the threaded rod (2) in the free state.

6. The self-locking bidirectional anti-loosening nut according to claim 1, characterized in that, The axial thickness of the nylon ring (34) in its natural state within the receiving cavity is slightly greater than the vertical distance between the lower end face of the anti-loosening ring (33) used for limiting and the upper end face of the anti-loosening ring (32) used for bearing, so that the nylon ring (34) is in a pre-compressed state after assembly.

7. The self-locking bidirectional anti-loosening nut according to claim 1, characterized in that, The anti-loosening ring (32) is a flat washer made of metal, and its hardness is lower than that of the surface hardness of the parts to be connected, so as to ensure that the radial pattern can produce a slight embedding effect when tightened.

8. The self-locking bidirectional anti-loosening nut according to claim 1, characterized in that, The rotating nut (31) and the rotating button (1) are integrally injection molded structures.

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