High-strength anti-loosening fastener

Abstract

The invention relates to the technical field of fasteners, and provides a high-strength anti-loosening fastener which comprises a first lock nut, the first lock nut is provided with a through hole, the through hole is provided with a first thread part and a first step part which are adjacent, a first anti-loosening ring is arranged on the first step part and provided with an anti-loosening cavity, and the diameter of the anti-loosening cavity is smaller than the thread inner diameter of the first thread part; the second lock nut is provided with a second step part, an extending part and a second thread part, the second step part abuts against the first anti-loosening ring, the extending part is arranged in the anti-loosening cavity and abuts against the first step part, the extending part is provided with a third thread part, threads of the third thread part are embedded into the first anti-loosening ring, and the thread inner diameter of the second thread part is equal to that of the first thread part. By means of the technical scheme, the problem that in the prior art, a nut is poor in anti-loosening effect is solved.

Description

Technical Field

[0001] The invention relates to the technical field of fasteners, and in particular to a high-strength anti-loosening fastener. Background Art

[0002] Common nuts and other fasteners used in the early days only relied on the friction between the threads to maintain the tightening state. Under actual working conditions, equipment is often affected by various external forces, such as continuous vibration caused by machine operation, impact during transportation, tension fluctuations caused by load changes, etc. These external forces can easily destroy the originally limited friction between the threads, causing nuts and other fasteners to loosen, which in turn causes the components of the connection to shift and shake, affecting the normal operation of the equipment and may even cause safety accidents. In equipment such as automobile engines and aerospace vehicles that have extremely high requirements for connection reliability, the consequences of this loosening problem are disastrous.

[0003] Subsequently, some improved anti-loosening fasteners appeared, such as spring washers and nylon inserts to enhance the anti-loosening effect. However, spring washers are prone to elastic fatigue after being subjected to alternating loads for a long time, resulting in a gradual decrease in their anti-loosening ability, and they cannot effectively prevent the fasteners from loosening continuously. Although nylon insert nuts can prevent loosening to a certain extent by utilizing the friction and clamping effect between nylon materials and threads, the properties of nylon materials may change in special environments such as high temperature and high humidity, affecting their anti-loosening effect. In addition, their anti-loosening ability is relatively limited. Under relatively harsh working conditions or high-intensity external forces, it is still difficult to ensure that the fasteners will not loosen.

[0004] Moreover, most traditional anti-loosening fasteners have a relatively simple structure and lack a multi-level and multi-dimensional anti-loosening design. They mainly focus on increasing friction through local structural improvements or setting simple blocking structures, but when faced with complex and changeable external forces, it is difficult to fully guarantee the stability of the fasteners. It is easy for the force in a certain direction to break through the anti-loosening line and cause the whole to loosen. It cannot meet the needs of some application scenarios that require long-term and strict connection stability.

[0005] In addition, traditional fasteners also have shortcomings in terms of the coordination and integrity between components. The components are often simply threaded together, lacking a tight mutual restraint and coordination mechanism, and cannot reasonably disperse and transmit external forces when subjected to force, resulting in stress concentration at the connection parts, further weakening the anti-loosening effect of the fasteners and the service life of the entire connection structure, increasing equipment maintenance costs and the risk of failure caused by loose fasteners. Summary of the invention

[0006] The invention provides a high-strength anti-loosening fastener, which solves the problem of poor anti-loosening effect of nuts in the related art.

[0007] The technical solution of the present invention is as follows: A high-strength anti-loosening fastener, comprising: a first lock nut, the first lock nut having a through hole, the through hole having a first threaded portion and a first step portion adjacent to each other; A first anti-loosening ring, the first anti-loosening ring is arranged on the first step portion, the first anti-loosening ring has an anti-loosening cavity, and the diameter of the anti-loosening cavity is smaller than the inner diameter of the thread of the first threaded portion; A second lock nut, the second lock nut has a second step portion, an extension portion and a second threaded portion, the second step portion abuts against the first anti-loosening ring, the extension portion is arranged in the anti-loosening cavity and abuts against the first step portion, the extension portion has a third threaded portion, the thread of the third threaded portion is embedded in the first anti-loosening ring, and the inner diameter of the second threaded portion is equal to that of the first threaded portion.

[0008] As a further technical solution, the side wall of the extending portion has a clearance groove, the end of the extending portion has a first guide slope, the first step portion has a second guide slope, and the extending portion is configured so that after the second guide slope abuts against the first guide slope, the extending portion produces elastic deformation.

[0009] As a further technical solution, the first anti-loosening ring has a wedge-shaped groove, and the wedge-shaped groove is located on the side wall of the first anti-loosening ring, and further includes: An anti-loosening bead is arranged in the wedge-shaped groove, and the anti-loosening bead is used to contact the third threaded portion to enhance the connection strength between the third threaded portion and the first anti-loosening ring.

[0010] As a further technical solution, the wedge-shaped groove is located in the middle of the first anti-loosening ring, the wedge-shaped groove has an opening, the opening faces the through hole cavity wall, the wedge-shaped groove has a large end and a small end, the cross-sectional area of ​​the large end gradually decreases toward the small end, and when the second lock nut enters the first lock nut, the rotation direction of the third threaded portion rotates along the direction from the small end to the large end.

[0011] As a further technical solution, the side wall of the through hole has an arc-shaped groove, and the wedge-shaped groove is located at the end of the first anti-loosening ring.

[0012] As a further technical solution, the arc-shaped groove has the same radius as the anti-loosening bead, and the anti-loosening bead is located in the arc-shaped groove.

[0013] As a further technical solution, the side wall of the first lock nut has a deformation groove, and the second step portion of the second lock nut has a protrusion, and the protrusion abuts against the first lock nut.

[0014] As a further technical solution, the second lock nut has a cavity at one end away from the first lock nut, and further comprises: A second anti-loosening ring, wherein the second anti-loosening ring is arranged in the housing cavity, the inner diameter of the second anti-loosening ring is the same as the inner diameter of the thread of the second threaded portion, and the second anti-loosening ring has the same structure as the first anti-loosening ring.

[0015] As a further technical solution, the wedge-shaped grooves are arranged in a plurality of circles.

[0016] As a further technical solution, the end of the anti-loosening cavity has a third guide surface.

[0017] The working principle and beneficial effects of the present invention are: In the present invention, the through hole of the first lock nut is provided with a first threaded portion and a first step portion, and this structure lays the foundation for the assembly and anti-loosening function of the entire fastener. The first threaded portion is used to be threadedly connected with the corresponding screw (or other threaded connector) to achieve basic fastening. Its specifications determine the compatibility with the connector and the mechanical properties such as tension and torque that it can withstand. The first step portion plays a role in positioning and bearing, providing a specific placement position for the subsequent installation of the first anti-loosening ring, so that the various components can have an accurate relative position relationship during assembly, ensuring the rationality and stability of the entire fastener structure.

[0018] The first lock nut is connected to the connector through threads and works with other components to tightly fix the connected components together. When subjected to external forces (such as vibration, impact, tension, etc.), it relies on its own thread structure to transmit and disperse the force to prevent the connected components from loosening or displacement, providing an initial stable foundation for the entire connection structure, ensuring the reliability of the connection under normal working conditions, and meeting the basic requirements for tightening in different application scenarios.

[0019] The diameter of the anti-loosening cavity of the first anti-loosening ring is smaller than the inner diameter of the thread of the first threaded part. This design is one of the core points to achieve the anti-loosening function. When the insertion part of the second lock nut is inserted into the anti-loosening cavity, due to its size limitation, a certain clamping force will be generated on the insertion part in the radial direction. This clamping force can effectively prevent the relative movement of the insertion part in the axial direction, thereby preventing the entire second lock nut from loosening. At the same time, during the operation of the equipment, even if it is disturbed by external forces such as vibration and impact, the limiting effect of the anti-loosening cavity can also maintain a relatively stable positional relationship between the components, avoiding the loosening of the threaded connection caused by external forces, and greatly enhancing the anti-loosening performance of the fastener.

[0020] The first anti-loosening ring is placed on the first step of the first lock nut and closely cooperates with the second lock nut to form a multi-level anti-loosening structure. It not only relies on its own structural characteristics to limit the movement of the second lock nut, but also reasonably disperses and transmits external forces between the components through the abutment relationship with the first step and subsequent components, further consolidating the anti-loosening effect of the entire fastener. For example, in the case of long-term dynamic load, the first anti-loosening ring can serve as a key link of buffering and restriction, ensuring the stability of the entire connection structure, extending the effective service life of the fastener, and improving the reliability of the connection.

[0021] The second lock nut has a second step portion, an insertion portion and a second threaded portion, and each portion works in coordination. The second step portion abuts against the first anti-loosening ring. This abutting relationship restricts the second lock nut in the axial direction, preventing it from easily detaching from the first anti-loosening ring when subjected to external force, thereby providing an axial constraint for the structural stability of the entire fastener. The insertion portion is disposed in the anti-loosening cavity and abuts against the first step portion, which not only enhances the tightness of the connection between the components, but also embeds the thread of the third threaded portion into the first anti-loosening ring, thereby achieving a mechanical interlocking effect and further enhancing the anti-loosening performance. The second threaded portion has an equal inner diameter to the first threaded portion, thereby ensuring that the corresponding screw or other connecting parts can be smoothly threadedly connected during the assembly process, and can evenly share the force after connection, thereby ensuring the stability of the entire connection structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The preferred implementation modes will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present invention.

[0023] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a schematic cross-sectional structural diagram of embodiment 1 of the present invention; Figure 3 This is a schematic structural diagram of the first anti-loosening ring of Example 1 of the present invention; Figure 4 It is a structural schematic diagram of the first lock nut in the present invention; Figure 5 It is a cross-sectional structural schematic diagram of Example 2 of the present invention; Figure 6 for Figure 5 A is a schematic diagram of the enlarged structure of the middle part; Figure 7 This is a schematic structural diagram of the first anti-loosening ring of Example 2 of the present invention; In the figure: the first lock nut -1, the through hole -101, the first threaded portion -102, the first step portion -103, the second guide inclined surface -104, the arc groove -105, the deformation groove -106, the first anti-loosening ring -2, the anti-loosening cavity -201, the wedge-shaped groove -202, the opening -203, the large end -204, the small end -205, the third guide surface -207, the second lock nut -3, the second step portion -301, the extension portion -302, the second threaded portion -303, the third threaded portion -304, the make way groove -305, the first guide inclined surface -306, the anti-loosening bead -4, the protrusion -306, the cavity -307, and the second anti-loosening ring -5. DETAILED DESCRIPTION In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0024] In order to simplify the drawings, only the parts related to the invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically shown, or only one of them is marked. In this article, "one" not only means "only one", but also means "more than one", and "several" includes "two" and "more than two".

[0025] In this document, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0027] Example 1 Reference Figure 1~Figure 4, which is the first embodiment of the present invention, a high-strength anti-loosening fastener is proposed, including a first lock nut 1, the first lock nut 1 has a through hole 101, the through hole 101 has adjacent first threaded portions 102 and first step portions 103, a first anti-loosening ring 2 is arranged on the first step portion 103, the first anti-loosening ring 2 has an anti-loosening cavity 201, the diameter of the anti-loosening cavity 201 is smaller than the inner diameter of the thread of the first threaded portion 102, the second lock nut 3 has a second step portion 301, an extension portion 302 and a second threaded portion 303, the second step portion 301 abuts against the first anti-loosening ring 2, the extension portion 302 is arranged in the anti-loosening cavity 201 and abuts against the first step portion 103, the extension portion 302 has a third threaded portion 304, the thread of the third threaded portion 304 is embedded in the first anti-loosening ring 2, and the inner diameter of the thread of the second threaded portion 303 is equal to that of the first threaded portion 102.

[0028] In this embodiment, the through hole 101 of the first lock nut 1 is provided with a first threaded portion 102 and a first step portion 103, and this structure lays the foundation for the assembly and anti-loosening function of the entire fastener. The first threaded portion 102 is used to be threadedly connected with the corresponding screw (or other threaded connector) to achieve basic fastening. Its specifications determine the compatibility with the connector and the mechanical properties such as tension and torque that it can withstand. The first step portion 103 plays a role in positioning and bearing, providing a specific placement position for the subsequent installation of the first anti-loosening ring 2, so that the various components can have an accurate relative position relationship during assembly, ensuring the rationality and stability of the entire fastener structure.

[0029] The first lock nut 1 is connected to the connecting piece through threads and works with other parts to tightly fix the connected parts together. When subjected to external forces (such as vibration, impact, tension, etc.), it relies on its own thread structure to transmit and disperse the force to prevent the connected parts from loosening or displacement, providing an initial stable foundation for the entire connection structure, ensuring the reliability of the connection under normal working conditions, and meeting the basic requirements for tightening in different application scenarios.

[0030] The diameter of the anti-loosening cavity 201 of the first anti-loosening ring 2 is smaller than the inner diameter of the thread of the first threaded portion 102. This design is one of the core points for realizing the anti-loosening function. When the insertion portion 302 of the second lock nut 3 is inserted into the anti-loosening cavity 201, due to its size limitation, a certain clamping force will be generated on the insertion portion 302 in the radial direction. This clamping force can effectively prevent the relative movement of the insertion portion 302 in the axial direction, thereby preventing the entire second lock nut 3 from loosening. At the same time, during the operation of the equipment, even if it is disturbed by external forces such as vibration and impact, the limiting effect of the anti-loosening cavity 201 can also maintain a relatively stable positional relationship between the various components, avoiding the occurrence of loose threaded connections caused by external forces, and greatly enhancing the anti-loosening performance of the fastener.

[0031] The first anti-loosening ring 2 is placed on the first step 103 of the first lock nut 1, and closely cooperates with the second lock nut 3 to form a multi-level anti-loosening structure. It not only relies on its own structural characteristics to limit the movement of the second lock nut 3, but also reasonably disperses and transmits external forces between the components through the abutment relationship with the first step 103 and subsequent components, further consolidating the anti-loosening effect of the entire fastener. For example, in the case of long-term dynamic load, the first anti-loosening ring 2 can serve as a key link of buffering and restriction, ensuring the stability of the entire connection structure, extending the effective service life of the fastener, and improving the reliability of the connection.

[0032] The second lock nut 3 has a second step portion 301, an insertion portion 302 and a second threaded portion 303, and each part works in coordination. The second step portion 301 abuts against the first anti-loosening ring 2, and this abutting relationship restricts the second lock nut 3 in the axial direction, preventing it from easily detaching from the first anti-loosening ring 2 when subjected to external force, and provides an axial constraint for the structural stability of the entire fastener. The insertion portion 302 is arranged in the anti-loosening cavity 201 and abuts against the first step portion 103, which not only enhances the tightness of the connection between the components, but also embeds the thread of the third threaded portion 304 into the first anti-loosening ring 2, achieving a mechanical interlocking effect, and further enhancing the anti-loosening performance. The second threaded portion 303 has an equal inner diameter to the first threaded portion 102, which ensures that the corresponding screw and other connecting parts can be smoothly threadedly connected during the assembly process, and can evenly share the force after connection, ensuring the stability of the entire connection structure.

[0033] Furthermore, the side wall of the extending portion 302 has a clearance groove 305, the end of the extending portion 302 has a first guiding slope 306, the first step portion 103 has a second guiding slope 104, and the extending portion 302 is configured so that after the second guiding slope 104 abuts against the first guiding slope 306, the extending portion 302 generates elastic deformation.

[0034] In this embodiment, the first guiding bevel 306 provided at the end of the insertion portion 302 and the second guiding bevel 104 corresponding to the first step portion 103 play a good guiding role during the installation process. When assembling the second lock nut 3 with the first lock nut 1, the operator only needs to move the second lock nut 3 toward the direction of the first lock nut 1. Under the guidance of the two guiding bevels, the insertion portion 302 can be more accurately aligned with the position of the anti-loosening cavity 201 and the first step portion 103, avoiding the problem of inaccurate alignment that may occur due to manual operation, reducing the difficulty of installation, and making the installation process smoother and more efficient.

[0035] When the second guide bevel 104 abuts the first guide bevel 306, the insertion portion 302 will produce elastic deformation, and this feature further optimizes the installation process. Due to the existence of elastic deformation, the insertion portion 302 can adaptively adjust its own size to a certain extent, making it easier to slide into the anti-loosening cavity 201 and abut against the first step portion 103. Compared with the insertion portion of a rigid structure, this design with elastic deformation ability reduces the stringent requirements for precise alignment of dimensions during installation, effectively avoiding the situation where installation cannot be performed due to slight deviations in size, improving the success rate and convenience of installation, and speeding up the assembly speed of the entire fastener, which is particularly suitable for mass installation production scenarios.

[0036] After installation, the insertion portion 302 can form a tighter fit with the anti-loosening cavity 201 and the first step portion 103 by relying on its elastic deformation recovery force. This tight fit is not only a simple physical contact, but also an additional clamping force in the radial direction between the components through the action of elastic force, which further limits the possibility of axial and radial movement of the insertion portion 302, thereby enhancing the anti-loosening performance of the entire fastener. During the operation of the equipment, even if it is disturbed by external forces such as vibration and impact, this tight connection caused by elastic deformation can better maintain the relative position stability of the components, reduce the risk of loosening, and ensure the long-term reliability of the connection structure.

[0037] Whether in an environment with large temperature changes such as high or low temperatures, or in harsh working conditions such as humidity and corrosion, the elastic deformation ability of the insertion portion 302 helps maintain the stable performance of the fastener. Temperature changes may cause thermal expansion and contraction of components, and the elastic insertion portion 302 can adapt to this volume change through its own deformation, avoiding the problem of too tight or too loose fit between components caused by thermal expansion and contraction; in harsh environments, even if there are some minor corrosion, wear and tear on the surface of the components, its elastic deformation can still ensure the tight connection between the components, ensuring that the anti-loosening function is not greatly affected, so that the fastener can adapt to a wider range of complex working conditions, extend its service life, and reduce the cost of frequent replacement of fasteners due to changes in working conditions.

[0038] Furthermore, the first anti-loosening ring 2 has a wedge-shaped groove 202, which is located on the side wall of the first anti-loosening ring 2, and also includes an anti-loosening bead 4, which is arranged in the wedge-shaped groove 202. The anti-loosening bead 4 is used to contact the third threaded portion 304 to enhance the connection strength between the third threaded portion 304 and the first anti-loosening ring 2.

[0039] In this embodiment, the anti-loosening bead 4 is arranged in the wedge-shaped groove 202 of the side wall of the first anti-loosening ring 2 and contacts the third threaded portion 304 of the second lock nut 3. This design constructs an additional connection reinforcement point between the third threaded portion 304 and the first anti-loosening ring 2. When the fastener is subjected to vibration, impact or other external forces, the anti-loosening bead 4 can play a blocking and limiting role, preventing the third threaded portion 304 from loosening or displacement relative to the first anti-loosening ring 2, further stabilizing the connection relationship between them, making the entire anti-loosening structure more reliable, greatly reducing the risk of fastener loosening due to long-term use or complex working conditions, effectively extending the service life of the fastener, and ensuring the stability of the connection part in various environments.

[0040] On the basis of the anti-loosening system originally composed of the first lock nut 1, the first anti-loosening ring 2 and the second lock nut 3, the addition of the anti-loosening bead 4 is equivalent to adding another anti-loosening defense line. The previous structure achieved anti-loosening by means of abutment between components, thread embedding and cavity clamping, while the anti-loosening bead 4 reinforces the microscopic level of thread contact, cooperates and synergizes with other anti-loosening mechanisms, forming a more rigorous and multi-level anti-loosening network, so that the fasteners can still maintain a good anti-loosening effect when facing complex and harsh external force conditions such as high-frequency vibration and alternating loads, meeting the needs of application scenarios with extremely high requirements for connection reliability.

[0041] The anti-loosening bead 4 contacts the third threaded portion 304 in the wedge-shaped groove 202. When external force acts on the fastener, it may have a tendency to roll forward under the action of friction, and the wedge-shaped structure of the wedge-shaped groove 202 limits the rolling of the anti-loosening bead 4. Before the anti-loosening bead 4 is damaged, the connection between the third threaded portion 304 and the first anti-loosening ring 2 is stable, and no relative displacement will occur.

[0042] Furthermore, the wedge-shaped groove 202 is located in the middle of the first anti-loosening ring 2, and the wedge-shaped groove 202 has an opening 203, and the opening 203 faces the cavity wall of the through hole 101. The wedge-shaped groove 202 has a large end 204 and a small end 205, and the cross-sectional area of ​​the large end 204 gradually decreases toward the small end 205. When the second lock nut 3 enters the first lock nut 1, the rotation direction of the third threaded portion 304 rotates along the direction from the small end 205 to the large end 204.

[0043] In this embodiment, the wedge-shaped groove 202 is located in the middle of the first anti-loosening ring 2 and its unique shape of gradually decreasing cross-sectional area from the large end 204 to the small end 205, combined with the specific rotation direction of the third threaded portion 304, creates a progressive anti-loosening mechanism. During the screwing process of the second lock nut 3, as the third threaded portion 304 rotates from the small end 205 to the large end 204 of the wedge-shaped groove 202, the anti-loosening bead 4 moves along the gradually shrinking groove body. During this process, the extrusion pressure between the anti-loosening bead 4 and the wall of the wedge-shaped groove 202 and the third threaded portion 304 is due to the anti-loosening bead 4 being at the large end 204, so that the third threaded portion 304 can be smoothly embedded in the first anti-loosening ring 2. When reversed for removal, the third threaded portion 304 pushes the anti-loosening bead 4 to a deeper degree to the small end, the friction force increases, and the connection becomes tighter, forming an effect similar to "the more you twist, the tighter it gets", which greatly enhances the anti-loosening ability of the threaded connection. Even under extreme working conditions such as long-term high-intensity vibration, frequent alternating loads, etc., it can effectively maintain the tightening state to ensure the reliability of the connection.

[0044] The opening 203 faces the cavity wall of the through hole 101 and the specified rotation direction, strictly limiting the unidirectional nature of anti-loosening. After the fastener is installed normally, if it is subjected to a reverse external force in actual use to attempt to reverse the second lock nut 3, the anti-loosening bead 4 will be stuck in the wedge-shaped groove 202. Due to the structure of the wedge-shaped groove 202 that tapers from the large end 204 to the small end 205, the anti-loosening bead 4 cannot easily move in the reverse direction, thereby strongly preventing the third threaded portion 304 from reversing and loosening, and accurately resisting the risk of loosening caused by unexpected reverse torque. This one-way anti-loosening mechanism is particularly important for some specific industrial application scenarios, such as the connection of transmission devices with a clear force direction and occasional reverse interference. It can maximize the guarantee that the connection remains stable in a complex and changeable force environment, and avoid equipment failures and safety hazards caused by loosening.

[0045] Example 2 Reference Figure 5~Figure 7 , which is the second embodiment of the present invention, and this embodiment is different from the first embodiment in that: Furthermore, the side wall of the through hole 101 has an arc-shaped groove 105 , and the wedge-shaped groove 202 is located at the end of the first anti-loosening ring 2 .

[0046] In this embodiment, an arc groove 105 is provided on the side wall of the through hole 101, and the wedge groove 202 is located at the end of the first anti-loosening ring 2, so that the anti-loosening action point and method are more diversified. When the second lock nut 3 is screwed in and matched with the first lock nut 1, in addition to the anti-loosening mechanism formed by the original third threaded portion 304 and the anti-loosening bead 4 in the wedge groove 202, the arc groove 105 can generate new contact with the anti-loosening bead 4 to increase the friction force on the anti-loosening bead 4 during disassembly, further reduce the possibility of loosening of the fastener, and improve the anti-loosening effect under complex working conditions.

[0047] Furthermore, the arc groove 105 and the anti-loosening bead 4 have the same radius, and the anti-loosening bead 4 is located in the arc groove 105 .

[0048] In this embodiment, the arc groove 105 has the same radius as the anti-loosening bead 4 and the anti-loosening bead 4 is located in the arc groove 105. This design enables the anti-loosening bead 4 to be accurately embedded in the arc groove 105, achieving a good positioning effect. When the fastener is subjected to various external forces, such as vibration, impact, alternating loads, etc., the anti-loosening bead 4 can maintain a stable position in the arc groove 105 and will not easily shift or fall out. It cooperates with the wedge groove 202 and other related components to form a stable restriction on key connection parts such as the third threaded portion 304 of the second lock nut 3 from multiple angles, further enhancing the anti-loosening ability of the entire fastener, minimizing the possibility of loosening due to external interference, and ensuring the long-term reliability of the connection under complex working conditions.

[0049] Furthermore, the side wall of the first lock nut 1 has a deformation groove 106 , and the second step portion 301 of the second lock nut 3 has a protrusion 306 , and the protrusion 306 abuts against the first lock nut 1 .

[0050] In this embodiment, the protrusion 306 on the second step portion 301 of the second lock nut 3 abuts against the first lock nut 1, forming an additional limiting structure in the axial direction. When the fastener is subjected to vibration, impact or other external forces that may cause loosening, the protrusion 306 can effectively prevent the second lock nut 3 from axially displacing relative to the first lock nut 1, limiting its loosening tendency, and cooperating with other existing anti-loosening structures (such as anti-loosening beads 4, wedge-shaped grooves 202, etc.), further consolidating the anti-loosening effect of the entire fastener, making the relative positions between the components more stable under complex and changeable working conditions, greatly reducing the risk of loosening of the fastener, and ensuring the long-term reliability of the connection part.

[0051] The presence of the deformation groove 106 on the side wall of the first lock nut 1 enables the first lock nut 1 to undergo a certain degree of elastic deformation when subjected to external force. This deformation characteristic, combined with the abutment effect of the protrusion 306, provides a complementary mechanism for preventing loosening. For example, when an external force attempts to loosen the second lock nut 3 and pushes it to move axially, the protrusion 306 squeezes the first lock nut 1, and the first lock nut 1 can deform appropriately with the help of the space in the deformation groove 106, while generating a reverse elastic restoring force, which acts on the protrusion 306, thereby further hindering the loosening of the second lock nut 3, and together with other anti-loosening measures, a more rigorous and multi-level anti-loosening system is constructed, which enhances the overall ability of the fastener to cope with various complex external force environments.

[0052] Furthermore, the second lock nut 3 has a cavity 307 at one end away from the first lock nut 1, and also includes a second anti-loosening ring 5, which is arranged in the cavity 307. The inner diameter of the second anti-loosening ring 5 is the same as the inner diameter of the thread of the second threaded portion 303, and the second anti-loosening ring 5 has the same structure as the first anti-loosening ring 2.

[0053] In this embodiment, a cavity 307 is provided at one end of the second lock nut 3 and a second anti-loosening ring 5 having the same structure as the first anti-loosening ring 2 is installed therein. This design is equivalent to creating a strong anti-loosening barrier at both ends of the fastener. The first anti-loosening ring 2 originally close to the first lock nut 1 can effectively prevent the second lock nut 3 from loosening relative to the first lock nut 1, while the second anti-loosening ring 5 located at the other end of the second lock nut 3 plays an equally excellent anti-loosening role for the external connector (such as a screw, etc.) that cooperates with the second lock nut 3. In this way, no matter which end of the fastener the external force is applied from, whether it is axial tension, pressure, or complex external forces caused by vibration, torsion, etc., the two-way anti-loosening structure can cooperate to resist, greatly reducing the probability of overall loosening, so that the fastener can maintain a reliable and stable connection state under various complex working conditions, greatly enhancing the overall anti-loosening effect.

[0054] Furthermore, the wedge-shaped grooves 202 are arranged in a plurality of circles.

[0055] In this embodiment, the wedge-shaped grooves 202 are provided in a plurality and arranged circumferentially, so that the anti-loosening beads 4 can form a circumferential distribution at the corresponding position of the first anti-loosening ring 2. When the fastener is subjected to vibration, impact or other external forces, the external forces from all directions can be evenly and effectively resisted. Whether it is axial tension, pressure, or radial torsional force, the multiple circumferentially arranged wedge-shaped grooves 202 and the anti-loosening beads 4 therein work together to restrict the third threaded portion 304 of the second lock nut 3 from all directions, greatly reducing the possibility of thread loosening due to external forces, and constructing a three-dimensional, dead angle-free anti-loosening system, further strengthening the overall anti-loosening effect of the fastener, so that it can maintain a stable connection state under more complex and harsh working conditions.

[0056] Multiple circumferentially arranged wedge grooves 202 change the way force is transmitted and dispersed. When external force is applied to the fastener, the force will be evenly dispersed to the first anti-loosening ring 2 through each wedge groove 202 and its corresponding anti-loosening bead 4, avoiding stress concentration in a few parts, so that the force borne by each wedge groove 202 and its surrounding structure is relatively small and uniform. This uniform stress state helps to maintain a close fit between the components, prevents deformation of components and damage to screw threads due to excessive local stress, ensures the stability of the fastener during long-term use, extends its service life, and better meets the needs of application scenarios with high requirements for connection reliability.

[0057] When the fastener is working, the circumferentially arranged wedge grooves 202 enable the force between the third threaded portion 304 and the first anti-loosening ring 2 to be more evenly distributed in the circumferential direction. Each wedge groove 202 is equivalent to an independent force point, and many such force points work together to prevent local overload during the force transmission process, and the stress distribution of the entire connection structure is more reasonable and balanced. This helps to improve the overall load-bearing capacity of the fastener. Whether it is subjected to large static tension, pressure, or complex dynamic alternating loads, it can rely on this uniformly stressed structural feature to ensure that the components are firmly connected, maintain the normal operation of the equipment or structure, and enhance the ability of the fastener to cope with complex stress environments.

[0058] Furthermore, the end of the anti-loosening cavity 201 has a third guide surface 207 .

[0059] In this embodiment, the third guide surface 207 provided at both ends of the anti-loosening cavity 201 plays a good guiding role in the installation process. When the insertion portion 302 of the second lock nut 3 needs to be inserted into the anti-loosening cavity 201, the third guide surface 207 can help the operator to more accurately align the insertion portion 302 with the entrance of the anti-loosening cavity 201, and in the process of the insertion portion 302 gradually inserting into the anti-loosening cavity 201, the third guide surface 207 can make the insertion action smoother. They can gradually guide the insertion portion 302 to the appropriate position as it enters, avoiding the occurrence of poor installation caused by sudden obstruction or jamming. Compared with the case without the third guide surface 207, the external force required to be applied by the operator during installation is more stable and predictable, and the feel of the entire insertion process is better, which further optimizes the installation experience, and also helps to protect the surface of related components and reduce problems such as wear and tear that may be caused by forced insertion.

[0060] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A high-strength anti-loosening fastener, characterized in that: include: A first lock nut (1), the first lock nut (1) having a through hole (101), the through hole (101) having adjacent first threaded portions (102) and first step portions (103); A first anti-loosening ring (2), the first anti-loosening ring (2) being arranged on the first step portion (103), the first anti-loosening ring (2) having an anti-loosening cavity (201), the diameter of the anti-loosening cavity (201) being smaller than the inner diameter of the thread of the first threaded portion (102); A second lock nut (3), the second lock nut (3) having a second step portion (301), an insertion portion (302) and a second threaded portion (303), the second step portion (301) abutting against the first anti-loosening ring (2), the insertion portion (302) being arranged in the anti-loosening cavity (201) and abutting against the first step portion (103), the insertion portion (302) having a third threaded portion (304), the thread of the third threaded portion (304) being embedded in the first anti-loosening ring (2), and the inner diameter of the thread of the second threaded portion (303) being equal to that of the first threaded portion (102).

2. A high-strength anti-loosening fastener according to claim 1, characterized in that: The side wall of the extending portion (302) has a clearance groove (305), the end of the extending portion (302) has a first guiding inclined surface (306), the first step portion (103) has a second guiding inclined surface (104), and the extending portion (302) is configured such that after the second guiding inclined surface (104) abuts against the first guiding inclined surface (306), the extending portion (302) generates elastic deformation.

3. A high-strength anti-loosening fastener according to claim 2, characterized in that: The first anti-loosening ring (2) has a wedge-shaped groove (202), the wedge-shaped groove (202) is located on the side wall of the first anti-loosening ring (2), and further comprises: An anti-loosening bead (4), the anti-loosening bead (4) being arranged in the wedge-shaped groove (202), the anti-loosening bead (4) being used to contact the third threaded portion (304) and to enhance the connection strength between the third threaded portion (304) and the first anti-loosening ring (2).

4. A high-strength anti-loosening fastener according to claim 3, characterized in that: The wedge-shaped groove (202) is located in the middle of the first anti-loosening ring (2), the wedge-shaped groove (202) has an opening (203), the opening (203) faces the cavity wall of the through hole (101), the wedge-shaped groove (202) has a large end (204) and a small end (205), the cross-sectional area of ​​the large end (204) gradually decreases toward the small end (205), and when the second lock nut (3) enters the first lock nut (1), the third threaded portion (304) rotates in a direction from the small end (205) to the large end (204).

5. A high-strength anti-loosening fastener according to claim 3, characterized in that: The side wall of the through hole (101) has an arc-shaped groove (105), and the wedge-shaped groove (202) is located at the end of the first anti-loosening ring (2).

6. A high-strength anti-loosening fastener according to claim 5, characterized in that: The arc-shaped groove (105) and the anti-loosening bead (4) have the same radius, and the anti-loosening bead (4) is located in the arc-shaped groove (105).

7. A high-strength anti-loosening fastener according to claim 1, characterized in that: The side wall of the first lock nut (1) has a deformation groove (106), and the second step portion (301) of the second lock nut (3) has a protrusion (306), and the protrusion (306) abuts against the first lock nut (1).

8. A high-strength anti-loosening fastener according to claim 1, characterized in that: The second lock nut (3) has a cavity (307) at one end away from the first lock nut (1), and further comprises: A second anti-loosening ring (5), the second anti-loosening ring (5) is arranged in the housing (307), the inner diameter of the second anti-loosening ring (5) is the same as the inner diameter of the thread of the second threaded portion (303), and the second anti-loosening ring (5) has the same structure as the first anti-loosening ring (2).

9. A high-strength anti-loosening fastener according to claim 3, characterized in that: The wedge-shaped grooves (202) are arranged in a plurality of circles.

10. The high-strength anti-loosening fastener according to claim 1, characterized in that: The end of the anti-loosening cavity (201) has a third guide surface (207).

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