Nut not prone to falling off

Abstract

The utility model relates to the technical field of fasteners, and provides a nut not easy to fall off, 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 to each other, a first anti-loosening ring is arranged on the first step part, and the first anti-loosening ring is provided with an anti-loosening cavity. 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, a stretching-in part and a second thread part, the second step part abuts against the first anti-loosening ring, the stretching-in part is arranged in the anti-loosening cavity and abuts against the first step part, the stretching-in part is provided with a third thread part, and threads of the third thread part are embedded into the first anti-loosening ring; the thread inner diameters of the second thread part and the first thread part are equal. 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] This utility model relates to the field of fastener technology, specifically to a nut that is not easily detached. Background Technology

[0002] Early common fasteners such as nuts relied solely on the friction between their threads to maintain a tight fit. However, in real-world applications, equipment is often subjected to various external forces, such as continuous vibrations from machine operation, impacts during transportation, and tension fluctuations due to load changes. These forces can easily disrupt the originally limited friction between the threads, causing fasteners like nuts to loosen. This can lead to displacement and shaking of components at the connection point, affecting the normal operation of the equipment and potentially causing safety accidents. In equipment with extremely high requirements for connection reliability, such loosening can have unimaginable consequences.

[0003] Subsequently, some improved anti-loosening fasteners emerged, such as those using spring washers and nylon inserts to enhance the anti-loosening effect. However, spring washers are prone to elastic fatigue after prolonged exposure to alternating loads, leading to a gradual decrease in their anti-loosening ability and rendering them unable to continuously and effectively prevent fasteners from loosening. While nylon insert nuts can utilize the friction and clamping effect between the nylon material and the threads to prevent loosening to some extent, the properties of the nylon material may change under special environments such as high temperature and high humidity, affecting its anti-loosening effect. Furthermore, their anti-loosening ability is relatively limited, and under harsh working conditions or high-intensity external forces, it is still difficult to guarantee that the fasteners will not loosen.

[0004] Moreover, traditional anti-loosening fasteners mostly have relatively simple structures and lack multi-layered, multi-dimensional anti-loosening designs. They mainly focus on increasing friction through local structural improvements or setting simple blocking structures. However, when faced with complex and variable external forces, it is difficult to ensure the stability of the fasteners in all aspects. They are prone to loosening due to a force in a certain direction breaking through the anti-loosening defense, and cannot meet the requirements of some application scenarios with long-term and stringent requirements for connection stability.

[0005] Furthermore, traditional fasteners also have shortcomings in terms of the fit and integrity between components. The components are often simply connected by threads, lacking a tight mutual restraint and coordination mechanism. When under stress, they cannot effectively distribute and transmit external forces, leading to stress concentration at the connection points. This further weakens 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 fastener loosening. Utility Model Content

[0006] This invention proposes a nut that is not easily detached, solving the problem of poor anti-loosening effect of nuts in related technologies.

[0007] The technical solution of this utility model is as follows:

[0008] A type of nut that is not easily detached, comprising:

[0009] A first lock nut, the first lock nut having a through hole, the through hole having an adjacent first threaded portion and a first stepped portion;

[0010] A first anti-loosening ring is disposed on the first stepped portion. The first anti-loosening ring has an anti-loosening cavity, the diameter of which is smaller than the inner diameter of the thread of the first threaded portion.

[0011] The second lock nut has a second stepped portion, an inserted portion, and a second threaded portion. The second stepped portion abuts against the first anti-loosening ring. The inserted portion is disposed in the anti-loosening cavity and abuts against the first stepped portion. The inserted portion has a third threaded portion. The threads of the third threaded portion are embedded in the first anti-loosening ring. The inner diameter of the second threaded portion is equal to that of the first threaded portion.

[0012] As a further technical solution, the sidewall of the extension portion has a clearance groove, the end of the extension portion has a first guide slope, the first step portion has a second guide slope, and the extension portion is configured such that after the second guide slope abuts against the first guide slope, the extension portion undergoes elastic deformation.

[0013] As a further technical solution, the first anti-loosening ring has a wedge-shaped groove, the wedge-shaped groove being located on the sidewall of the first anti-loosening ring, and further includes:

[0014] An anti-loosening bead is disposed in the wedge-shaped groove and is used to contact the third threaded portion to enhance the connection strength between the third threaded portion and the first anti-loosening ring.

[0015] As a further technical solution, the wedge groove is located in the middle of the first anti-loosening ring. The wedge groove has an opening facing the through hole cavity wall. The wedge groove has a large end and a small end. The cross-sectional area of ​​the large end gradually decreases towards the small end. When the second lock nut enters the first lock nut, the rotation direction of the third threaded part is along the direction from the small end to the large end.

[0016] The working principle and beneficial effects of this utility model are as follows:

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

[0018] The first lock nut is threaded onto the connector and works in conjunction with other components to firmly secure the connected parts together. When subjected to external forces (such as vibration, impact, tension, etc.), it relies on its own threaded structure to transmit and disperse the force, preventing the connected parts from loosening or shifting. This provides an initial stable foundation for the entire connection structure, ensuring the reliability of the connection under normal operating conditions and meeting the basic fastening requirements of different application scenarios.

[0019] The anti-loosening cavity diameter of the first anti-loosening ring is smaller than the thread inner diameter of the first threaded part. This design is one of the core elements for achieving the anti-loosening function. When the extension of the second lock nut extends into the anti-loosening cavity, due to its size limitation, it will generate a certain clamping force on the extension in the radial direction. This clamping force can effectively prevent the extension from moving relative to the extension in the axial direction, thereby preventing the entire second lock nut from loosening. At the same time, during equipment operation, even if subjected to external forces such as vibration and impact, the restraining effect of the anti-loosening cavity can maintain a relatively stable positional relationship between the components, avoiding loosening of the threaded connection due to 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 fits tightly with the second lock nut, forming a multi-level anti-loosening structure. It not only restricts the movement of the second lock nut through its own structural features, but also, through its contact with the first step and subsequent components, rationally distributes and transmits external forces among the components, further consolidating the overall anti-loosening effect of the fastener. For example, under long-term dynamic loads, the first anti-loosening ring can act as a key buffer and constraint, 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 stepped portion, an inserted portion, and a second threaded portion, all of which work together. The second stepped portion abuts against the first anti-loosening ring. This abutment restricts the second lock nut in the axial direction, preventing it from easily disengaging from the first anti-loosening ring under external force, thus providing axial constraint for the structural stability of the entire fastener. The inserted portion is located within the anti-loosening cavity and abuts against the first stepped portion. This not only enhances the tightness of the connection between components but also achieves a mechanical interlocking effect through the threads of its third threaded portion engaging with the first anti-loosening ring, further strengthening the anti-loosening performance. The inner diameter of the second threaded portion is equal to that of the first threaded portion, ensuring smooth threaded connection with corresponding screws and other connecting parts during assembly. Furthermore, after connection, the force is evenly distributed, ensuring the stability of the entire connection structure. Attached Figure Description

[0022] The preferred embodiments will be described below in a clear and easy-to-understand manner, in conjunction with the accompanying drawings, to further explain the above-mentioned characteristics, technical features, advantages and implementation methods of this utility model.

[0023] Figure 1 This is a schematic diagram of the structure of this utility model;

[0024] Figure 2 This is a cross-sectional view of Embodiment 1 of the present invention;

[0025] Figure 3 This is a schematic diagram of the structure of the first anti-loosening ring in Embodiment 1 of this utility model;

[0026] Figure 4 This is a schematic diagram of the structure of the first lock nut in this utility model;

[0027] In the diagram: First lock nut-1, through hole-101, first threaded part-102, first stepped part-103, second guide slope-104, first anti-loosening ring-2, anti-loosening cavity-201, wedge groove-202, opening-203, large end-204, small end-205, second lock nut-3, second stepped part-301, extension part-302, second threaded part-303, third threaded part-304, clearance groove-305, first guide slope-306, anti-loosening bead-4. Detailed Implementation

[0028] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the specific implementation methods of this utility model will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of this utility model. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0029] To keep the drawings concise, only the parts relevant to the utility model are shown schematically in each drawing; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of the components with the same structure or function is schematically shown, or only one is labeled. In this document, "a" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0030] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0031] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0032] Reference Figures 1-4 As an embodiment of this utility model, a nut that is not easily detached is proposed, including a first lock nut 1, the first lock nut 1 having a through hole 101, the through hole 101 having an adjacent first threaded portion 102 and a first stepped portion 103, a first anti-loosening ring 2 disposed on the first stepped 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 thread inner diameter of the first threaded portion 102, a second lock nut 3 having a second stepped portion 301, an insertion portion 302 and a second threaded portion 303, the second stepped portion 301 abutting against the first anti-loosening ring 2, the insertion portion 302 being disposed in the anti-loosening cavity 201 and abutting against the first stepped portion 103, the insertion portion 302 having a third threaded portion 304, the threads of the third threaded portion 304 being embedded in the first anti-loosening ring 2, and the thread inner diameter of the second threaded portion 303 being equal to that of the first threaded portion 102.

[0033] In this embodiment, the through hole 101 of the first lock nut 1 is provided with a first threaded portion 102 and a first stepped portion 103. This structure lays the foundation for the assembly and anti-loosening function of the entire fastener. The first threaded portion 102 is used to connect with the corresponding screw (or other threaded connector) to achieve a basic fastening function. Its specifications determine the compatibility with the connector and the mechanical properties such as tensile force and torque that it can withstand. The first stepped portion 103 plays a positioning and bearing role, providing a specific placement position for the subsequent installation of the first anti-loosening ring 2, so that the components can have an accurate relative positional relationship during assembly, ensuring the rationality and stability of the entire fastener structure.

[0034] The first lock nut 1 is threaded onto the connector and works in conjunction with other components to firmly secure the connected components together. When subjected to external forces (such as vibration, impact, tension, etc.), it relies on its own threaded structure to transmit and disperse the force, preventing the connected components from loosening or shifting. This provides an initial stable foundation for the entire connection structure, ensuring the reliability of the connection under normal operating conditions and meeting the basic fastening requirements of different application scenarios.

[0035] 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 elements for achieving the anti-loosening function. When the extension portion 302 of the second lock nut 3 extends into the anti-loosening cavity 201, due to its size limitation, a certain clamping force is generated on the extension portion 302 in the radial direction. This clamping force can effectively prevent the relative movement of the extension portion 302 in the axial direction, thereby preventing the entire second lock nut 3 from loosening. At the same time, during equipment operation, even if subjected to external forces such as vibration and impact, the limiting effect of the anti-loosening cavity 201 can 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.

[0036] The first anti-loosening ring 2 is placed on the first step portion 103 of the first lock nut 1 and fits tightly with the second lock nut 3, forming a multi-level anti-loosening structure. It not only restricts the movement of the second lock nut 3 through its own structural characteristics, but also, through its contact with the first step portion 103 and subsequent components, rationally distributes and transmits external forces among the components, further consolidating the overall anti-loosening effect of the fastener. For example, under long-term dynamic loads, the first anti-loosening ring 2 can act as a key buffer and constraint, ensuring the stability of the entire connection structure, extending the effective service life of the fastener, and improving the reliability of the connection.

[0037] The second lock nut 3 has a second stepped portion 301, an inserted portion 302, and a second threaded portion 303, all of which work together. The second stepped portion 301 abuts against the first anti-loosening ring 2. This abutment restricts the second lock nut 3 in the axial direction, preventing it from easily disengaging from the first anti-loosening ring 2 under external force, thus providing axial constraint for the structural stability of the entire fastener. The inserted portion 302 is located within the anti-loosening cavity 201 and abuts against the first stepped portion 103. This not only enhances the tightness of the connection between components but also achieves a mechanical interlocking effect through the threads of its third threaded portion 304 embedded in the first anti-loosening ring 2, further strengthening the anti-loosening performance. The inner diameter of the thread of the second threaded portion 303 is equal to that of the first threaded portion 102, ensuring smooth threaded connection with corresponding screws and other connecting parts during assembly. After connection, the force is evenly distributed, ensuring the stability of the entire connection structure.

[0038] Furthermore, the sidewall of the extension portion 302 has a relief groove 305, the end of the extension portion 302 has a first guide slope 306, the first step portion 103 has a second guide slope 104, and the extension portion 302 is configured such that after the second guide slope 104 abuts against the first guide slope 306, the extension portion 302 undergoes elastic deformation.

[0039] In this embodiment, the first guide slope 306 and the second guide slope 104 corresponding to the first step portion 103 at the end of the extension portion 302 play a good guiding role during installation. When assembling the second lock nut 3 and the first lock nut 1, the operator only needs to move the second lock nut 3 toward the first lock nut 1. Under the guidance of the two guide slopes, the extension portion 302 can more accurately align the anti-loosening cavity 201 and the position of the first step portion 103, avoiding the inaccurate alignment problem that may occur due to manual operation, reducing the installation difficulty, and making the installation process smoother and more efficient.

[0040] When the second guide ramp 104 abuts against the first guide ramp 306, the insertion part 302 undergoes elastic deformation, a characteristic that further optimizes the installation process. Due to the elastic deformation, the insertion part 302 can adaptively adjust its size to a certain extent, making it easier to slide into the anti-loosening cavity 201 and abut against the first step part 103. Compared to a rigid insertion part, this design with elastic deformation capability reduces the stringent requirement for precise alignment during installation, effectively avoiding situations where installation is impossible due to slight dimensional deviations, improving the success rate and convenience of installation, and accelerating the assembly speed of the entire fastener, making it particularly suitable for mass production scenarios.

[0041] After installation, the extension portion 302, relying on its elastic deformation recovery force, can form a tighter fit with the anti-loosening cavity 201 and the first step portion 103. This tight fit is not just a simple physical contact, but also generates an additional radial clamping force between the components through the action of elastic force, further restricting the possibility of movement of the extension portion 302 in the axial and radial directions, thereby strengthening the anti-loosening performance of the entire fastener. During equipment operation, even under external force interference such as vibration and impact, this tight connection generated by elastic deformation can better maintain the relative positional stability of the components, reduce the risk of loosening, and ensure the long-term reliability of the connection structure.

[0042] Whether in environments with significant temperature variations, such as high or low temperatures, or in harsh conditions such as humidity and corrosion, the elastic deformation capability of the inserted portion 302 helps maintain the stability of the fastener's performance. Temperature changes may cause thermal expansion and contraction of components, and the elastic inserted portion 302 can adapt to these volume changes through its own deformation, avoiding problems such as excessively tight or loose fits between components due to thermal expansion and contraction. In harsh environments, even if there is some minor corrosion or wear on the surface of the components, its elastic deformation can still ensure a tight connection between the components, ensuring that the anti-loosening function is not significantly affected. This allows the fastener to adapt to a wider range of complex working conditions, extends its service life, and reduces the cost of frequent fastener replacements due to changes in working conditions.

[0043] Furthermore, the first anti-loosening ring 2 has a wedge-shaped groove 202 located on the side wall of the first anti-loosening ring 2, and also includes an anti-loosening bead 4 disposed 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.

[0044] In this embodiment, the anti-loosening bead 4 is disposed within the wedge-shaped groove 202 on 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 creates 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 act as a barrier and constraint, preventing the third threaded portion 304 from loosening or shifting relative to the first anti-loosening ring 2, further stabilizing the connection 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.

[0045] The addition of the anti-loosening bead 4 adds another layer of protection to the existing anti-loosening system, which consists of the first lock nut 1, the first anti-loosening ring 2, and the second lock nut 3. The previous structure achieved anti-loosening through the contact between components, the insertion of threads, and the clamping of the cavity. The anti-loosening bead 4, however, reinforces the system at the microscopic level of threaded contact, working in conjunction with other anti-loosening mechanisms to form a more robust, multi-layered anti-loosening network. This ensures that the fasteners maintain excellent anti-loosening performance even under complex and harsh external conditions such as high-frequency vibration and alternating loads, meeting the requirements of applications with extremely high connection reliability.

[0046] The anti-loosening ball 4 contacts the third threaded part 304 in the wedge groove 202. When an external force is applied to the fastener, it can tend to roll forward under the action of friction. The wedge structure of the wedge groove 202 restricts the rolling of the anti-loosening ball 4. Before the anti-loosening ball 4 is damaged, the connection between the third threaded part 304 and the first anti-loosening ring 2 is stable and there will be no relative displacement.

[0047] Furthermore, the wedge groove 202 is located in the middle of the first anti-loosening ring 2. The wedge groove 202 has an opening 203 facing the cavity wall of the through hole 101. The wedge groove 202 has a large end 204 and a small end 205. The cross-sectional area of ​​the large end 204 gradually decreases towards the small end 205. When the second lock nut 3 enters the first lock nut 1, the rotation direction of the third threaded part 304 is along the direction from the small end 205 to the large end 204.

[0048] In this embodiment, the wedge-shaped groove 202 is located in the middle of the first anti-loosening ring 2, and its unique shape, with its large end 204 gradually decreasing in cross-sectional area towards 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 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 narrowing groove. During this process, the squeezing force between the anti-loosening bead 4, the wall of the wedge groove 202, and the third threaded part 304 is such that the anti-loosening bead 4 is located at the large end 204, which allows the third threaded part 304 to be smoothly embedded in the first anti-loosening ring 2. When it is reversed and removed, the third threaded part 304 pushes the anti-loosening bead 4 to the small end deeper and deeper, the friction increases, and the connection becomes tighter, forming an effect similar to "tightening more and more", which greatly enhances the anti-loosening ability of the threaded connection. Even under extreme working conditions such as long-term high-intensity vibration and frequent alternating loads, it can effectively maintain the tightness and ensure the reliability of the connection.

[0049] The opening 203 faces the cavity wall of the through hole 101 and the specified rotation direction, strictly limiting the unidirectional nature of the anti-loosening mechanism. When the fastener is properly installed, if a reverse external force is applied during actual use to attempt to reverse the second lock nut 3, the anti-loosening ball 4 will be stuck in the wedge groove 202. Due to the gradually narrowing structure of the wedge groove 202 from the large end 204 to the small end 205, the anti-loosening ball 4 cannot easily move in the reverse direction, thus strongly preventing the third threaded part 304 from reversing and loosening, precisely resisting the risk of loosening caused by unexpected reverse torque. This unidirectional anti-loosening mechanism is particularly important in certain industrial applications, such as transmission device connections with a clear force direction and occasional reverse interference. It can maximize the stability of the connection under complex and variable force environments, avoiding equipment failures and safety hazards caused by loosening.

[0050] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A nut that is not easily detached, characterized in that, include: The first lock nut (1) has a through hole (101) and the through hole (101) has an adjacent first threaded portion (102) and a first stepped portion (103). The first anti-loosening ring (2) is disposed on the first stepped 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).

2. The nut that is not easily detached according to claim 1, characterized in that, Also includes: The second lock nut (3) has a second stepped portion (301), an insertion portion (302), and a second threaded portion (303). The second stepped portion (301) abuts against the first anti-loosening ring (2). The insertion portion (302) is disposed in the anti-loosening cavity (201) and abuts against the first stepped portion (103). The insertion portion (302) has a third threaded portion (304). The threads of the third threaded portion (304) are embedded in the first anti-loosening ring (2). The inner diameter of the second threaded portion (303) is equal to that of the first threaded portion (102).

3. A nut that is not easily detached according to claim 2, characterized in that, The sidewall of the extension portion (302) has a relief groove (305), the end of the extension portion (302) has a first guide slope (306), the first step portion (103) has a second guide slope (104), and the extension portion (302) is configured such that after the second guide slope (104) abuts against the first guide slope (306), the extension portion (302) undergoes elastic deformation.

4. A nut that is not easily detached according to claim 3, 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 includes: Anti-loosening bead (4) is disposed in the wedge groove (202). The anti-loosening bead (4) is used to contact the third threaded part (304) and to enhance the connection strength between the third threaded part (304) and the first anti-loosening ring (2).

5. A nut that is not easily detached according to claim 4, characterized in that, The wedge groove (202) is located in the middle of the first anti-loosening ring (2). The wedge groove (202) has an opening (203) facing the cavity wall of the through hole (101). The wedge groove (202) has a large end (204) and a small end (205). The cross-sectional area of ​​the large end (204) gradually decreases towards the small end (205). When the second lock nut (3) enters the first lock nut (1), the rotation direction of the third threaded part (304) is along the direction from the small end (205) to the large end (204).

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