An eccentric self-locking lock nut

Abstract

The utility model discloses an eccentric self -locking check nut, including first nut and second nut, the second nut is embedded in first nut one side through boss, is equipped with the second thread hole on the second nut, and the tooth of the thread in the second thread hole one side is provided with wedge surface, and the boss is eccentric and is arranged on the second nut, the first nut and the second nut of this application can be embedded through setting two, when installing check nut, the second nut is connected with bolt through the thread of setting wedge surface, and the wedge surface is cooperated and realizes preliminary check through the outer thread on bolt, then first nut is connected with bolt, and is abutted with the eccentric boss on the second nut, and first nut and second nut are further improved the connecting strength of second nut and bolt through abutting tightly, and the friction between first nut and second nut is produced, and the damping becomes big, thereby enhancing locking check effect.

Description

Technical Field

[0001] This utility model relates to the field of fastener technology, specifically to an eccentric self-locking anti-loosening nut. Background Technology

[0002] With rapid economic development and product upgrades, the requirements for fasteners in various industries are becoming increasingly stringent, and their quality stability and reliability are becoming more and more important. The anti-loosening performance of fasteners is receiving increasing attention, and the market is flooded with various anti-loosening fasteners, with varying opinions on their performance.

[0003] Most existing lock nuts are integral structures. When subjected to external force, the nut and bolt are displaced, resulting in poor lock-loosening effect. Utility Model Content

[0004] To address the shortcomings of existing technologies, an eccentric self-locking anti-loosening nut is proposed, which solves the problem that most anti-loosening nuts in the aforementioned background technologies are integral structures, and when subjected to external forces, displacement occurs between the nut and the bolt, resulting in poor anti-loosening effect.

[0005] To achieve the above objectives, the present invention proposes the following technologies: An eccentric self-locking anti-loosening nut includes a first nut and a second nut. The second nut is embedded on one side of the first nut by a boss. The second nut has a second threaded hole. A wedge-shaped surface is provided on one side of the thread root in the second threaded hole. The boss is eccentrically positioned on the second nut.

[0006] Furthermore, a first inclined surface and a second inclined surface are respectively provided on both sides of the root of the thread in the second threaded hole, and the wedge-shaped surface is located between the first inclined surface and the second inclined surface.

[0007] Furthermore, the angle between the wedge-shaped surface and the axis of the second threaded hole is 30 degrees, and when the second nut is connected to the bolt, the tip of the bolt abuts against the wedge-shaped surface.

[0008] Furthermore, the wedge-shaped surface is perpendicular to the first inclined surface, and the wedge-shaped surface and the second inclined surface form a 150-degree angle.

[0009] Furthermore, the first nut is located on the side of the second nut where the boss is provided, and the first nut has a groove to accommodate the boss and thus achieve a fit.

[0010] Furthermore, the depth of the groove matches the height of the boss, and when the first nut and the second nut are engaged, the root of the boss is flush with the outer edge of the groove.

[0011] Furthermore, the first nut has a first threaded hole, which is located at the bottom of the groove and is coaxial with the groove.

[0012] Furthermore, the second threaded hole passes through the second nut and the boss, and the second nut and the first nut are respectively coaxially arranged with the bolt.

[0013] Furthermore, the sidewalls of the groove are inclined, the outer surface of the boss is inclined, and the edge of the boss abuts against the groove to lock the first nut and the second nut.

[0014] Furthermore, the first nut and the second nut are coaxially arranged, and the outer diameter of the first nut is equal to the outer diameter of the second nut.

[0015] Compared with the prior art, the comprehensive effects brought about by this utility model include: This application uses two mating nuts, a first nut and a second nut. When the anti-loosening nut is installed, the second nut is connected to the bolt through a thread with a wedge-shaped surface. The bolt's external thread engages with the wedge-shaped surface to achieve initial anti-loosening. Then, the first nut is connected to the bolt and abuts against the eccentric boss on the second nut. The tightness between the first and second nuts further increases the connection strength between the second nut and the bolt. At the same time, friction is generated between the first and second nuts, increasing the damping and thus enhancing the locking and anti-loosening effect. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the fitting structure of the first nut and the second nut in an embodiment of this utility model; Figure 2 This is a schematic diagram of the wedge-shaped surface and tooth cusp contact structure according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the internal structure of the second nut in an embodiment of the present invention; Figure 4 This is a top view of the second nut in an embodiment of the present invention; Figure 5 This is a schematic diagram of the internal structure of the first nut in an embodiment of the present invention; Figure 6 This is a top view of the first nut in an embodiment of the present invention.

[0017] Legend: 1. First nut; 2. Second nut; 3. Boss; 4. Second threaded hole; 5. Root of tooth; 6. Wedge-shaped surface; 7. First inclined surface; 8. Second inclined surface; 9. Tooth tip; 10. Groove; 11. First threaded hole. Detailed Implementation

[0018] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0019] In this document, terms such as “up,” “down,” “left,” “right,” and “top” indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0020] like Figures 1 to 6 As shown, an eccentric self-locking anti-loosening nut includes a first nut 1 and a second nut 2. The second nut 2 is embedded on one side of the first nut 1 through a boss 3. The second nut 2 has a second threaded hole 4. A wedge-shaped surface 6 is provided on one side of the thread root 5 in the second threaded hole 4. The boss 3 is eccentrically positioned on the second nut 2.

[0021] Two mating nuts, a first nut 1 and a second nut 2, are provided. When the anti-loosening nut is installed, the second nut 2 is connected to the bolt via a thread with a wedge-shaped surface 6. The bolt teeth will press against this wedge-shaped surface 6. Under the action of external forces such as vibration that may cause loosening, this pressing state will have an increased frictional force or a slight deformation locking effect due to the wedge-shaped surface 6, thereby achieving self-locking and anti-loosening. The initial anti-loosening is achieved by the engagement of the external thread on the bolt with the wedge-shaped surface 6. Then, the first nut 1 is connected to the bolt and abuts against the eccentric boss 3 on the second nut 2. The tightness between the first nut 1 and the second nut 2 further improves the connection strength between the second nut 2 and the bolt. At the same time, friction is generated between the first nut 1 and the second nut 2, and the damping increases, thereby enhancing the locking and anti-loosening effect.

[0022] Specifically, under vibration load, the wedge-shaped surface 6 can guide the bolt tip to generate radial force, which forces the friction between the threaded pairs to increase significantly, thereby achieving dynamic self-locking. It can effectively resist the loosening failure of the threaded connection structure caused by mechanical vibration and impact, and its anti-loosening performance is better than that of the traditional double nut structure.

[0023] In the eccentric self-locking anti-loosening nut of this embodiment, a first inclined surface 7 and a second inclined surface 8 are respectively provided on both sides of the thread root 5 in the second threaded hole 4, and the wedge-shaped surface 6 is located between the first inclined surface 7 and the second inclined surface 8.

[0024] Specifically, this application uses the first inclined surface 7 and the second inclined surface 8 to distribute the load applied by the bolt to the wedge-shaped surface 6 to both sides of the thread root. Combined with the central design of the wedge-shaped surface 6, the load is evenly distributed on the entire thread contact surface, which can effectively extend the service life of the nut, especially in scenarios of repeated disassembly and assembly, and avoid premature failure. At the same time, the inclined surfaces on both sides serve as the supporting foundation of the wedge-shaped surface 6, guiding the bolt thread tip to slide along a predetermined path under vibration conditions, thereby enhancing the dynamic locking effect.

[0025] In this embodiment of the eccentric self-locking anti-loosening nut, the included angle between the wedge-shaped surface 6 and the axis of the second threaded hole 4 is 30 degrees. When the second nut 2 is connected to the bolt, one side of the thread tip 9 on the bolt abuts against the wedge-shaped surface 6.

[0026] Specifically, the external thread on the bolt is a trapezoidal thread, and the cross section of its tooth tip 9 is trapezoidal. When the second nut 2 is connected to the bolt, the tip of the top side of the tooth tip 9 gradually approaches the wedge surface 6 and abuts against the wedge surface 6. Through the contact and abutment of the aforementioned tip, the second nut 2 applies a locking force to the bolt. Compared with ordinary threads, it can effectively improve the anti-loosening and locking effect.

[0027] In this embodiment of the eccentric self-locking anti-loosening nut, the wedge-shaped surface 6 is perpendicular to the first inclined surface 7, and the wedge-shaped surface 6 and the second inclined surface 8 form a 150-degree angle.

[0028] Through the above configuration, the two inclined surfaces disperse the stress on the wedge-shaped surface 6 from the bolt root, reducing the risk of thread shear damage and thus extending the number of times the nut can be reused. Simultaneously, the two sides of the thread groove of the second threaded hole 4 correspond to the two sides of the thread teeth on the bolt, preventing interference during the engagement of the second nut 2 with the bolt. This also guides the external thread on the bolt, facilitating the installation of the second nut 2 and ensuring the tightness between the wedge-shaped surface 6 and the bolt tooth tip 9, thereby enhancing the locking effect.

[0029] In this embodiment of the eccentric self-locking anti-loosening nut, the first nut 1 is located on the side of the second nut 2 where the boss 3 is provided. The first nut 1 has a groove 10 to accommodate the boss 3 and thus achieve fitting.

[0030] Specifically, the second threaded hole 4 is coaxial with the second nut 2, and the boss 3 is not collinear with the aforementioned axis. When installing the second nut 2, the boss 3 rotates eccentrically around the bolt. The second threaded hole 4 passes through the second nut 2 and the boss 3. Through the above arrangement, the length of the part where the second threaded hole 4 is connected to the bolt thread is increased, so that a certain length of wedge surface 6 abuts against the bolt, thereby improving the locking effect.

[0031] With the above configuration, the first nut 1 is a concave nut and the second nut 2 is a convex nut. The first nut 1 locks the second nut 2 through the engagement of the groove 10 and the boss 3. When installing the anti-loosening nut, the second nut 2 is first connected to the bolt with the boss 3 facing upward. The wedge-shaped surface 6 and the external thread on the bolt are used to tighten the connection between the second nut 2 and the bolt, achieving initial anti-loosening. Then, the first nut 1 is connected to the bolt with the groove 10 facing downward. As the threads engage, the groove 10 gradually approaches the boss 3 and covers it. During the process of the first nut 1 and the second nut 2 approaching each other, the eccentrically positioned boss 3 can be regarded as rotating within the groove 10 and gradually approaching the inner wall of the groove 10 and finally abutting against it. The first nut 1 applies a locking force to the second nut 2 through the contact point between the groove 10 and the boss 3, further increasing the locking force between the second nut 2 and the anti-loosening nut as a whole and the bolt, achieving double locking and anti-loosening, which can reduce the occurrence of loosening of the fastening structure due to vibration or external impact.

[0032] By abutting against the boss 3 through the groove 10, the circumferential micro-displacement of the second nut 2 is restricted. Combined with the dynamic locking effect of the wedge surface 6, it can effectively suppress the fretting wear of the bolt-nut pair, and has a good anti-loosening and locking effect, which is especially suitable for high-frequency vibration environments.

[0033] Preferably, the clamping of the first nut 1 and the second nut 2 generates static friction between them. This friction and clamping force increase the damping between the anti-loosening nut and the bolt, further preventing the threaded connection from loosening and better locking the threaded connection structure.

[0034] In this embodiment of the eccentric self-locking anti-loosening nut, the first nut 1 is provided with a first threaded hole 11, which is located at the bottom of the groove 10 and is coaxial with the groove 10.

[0035] Specifically, the second nut 2 and the first nut 1 are respectively coaxially arranged with the bolt. The first threaded hole 11 passes through the first nut 1, thereby connecting the groove 10. When the first nut 1 is installed, the bolt passes through the groove 10 and is threadedly connected to the first threaded hole 11. As the first nut 1 and the groove 10 gradually approach the boss 3, the groove 10 rotates around the bolt axis until the inner wall of the groove 10 abuts against the outer edge of the boss 3, thereby locking the first nut 1 to the second nut 2. This, combined with the wedge-shaped surface 6 structure, achieves double locking, greatly increasing the locking and anti-loosening effect.

[0036] In this embodiment, the first threaded hole 11 has a common trapezoidal internal thread. After the second nut 2 is initially locked by connecting to the bolt through the wedge-shaped surface 6, the first nut 1 is normally threaded connected to the bolt. The first nut 1 locks the second nut 2. When the boss 3 abuts against the groove 10, the second nut 2 and the first nut 1 are locked together with the bolt, thus achieving the locking and anti-loosening of the nut.

[0037] Preferably, the eccentric self-locking nut can be made of an elastic material. By utilizing the elasticity of the material itself, a certain elastic deformation is generated between the contact surfaces of the boss 3 and the groove 10, or between the wedge-shaped surface 6 of the thread inside the second nut 2 and the bolt, which increases the friction or damping effect, thereby better locking the threaded connection.

[0038] In this embodiment of the eccentric self-locking anti-loosening nut, the depth of the groove 10 matches the height of the boss 3. When the first nut 1 and the second nut 2 are engaged, the root of the boss 3 is flush with the outer edge of the groove 10.

[0039] Specifically, the diameter of the groove 10 is larger than the outer diameter of the boss 3. When the first nut 1 is rotated outside the bolt to approach the second nut 2, the groove 10 can rotate freely around the outer periphery of the boss 3, which is eccentric to the second threaded hole 4, thus avoiding interference between the two. The depth of the groove 10 is greater than or equal to the height of the boss 3, ensuring that when the first nut 1 is installed and fitted with the second nut 2, the bottom end face of the first nut 1 and the top end face of the second nut 2 are tightly fitted, preventing gaps between the first nut 1 and the second nut 2 due to excessive height of the boss 3.

[0040] Preferably, the depth of the groove 10 is slightly greater than the height of the boss 3. After the first nut 1 and the second nut 2 are installed, there is a certain distance between the end face of the boss 3 and the bottom face of the groove 10. The above setting makes a certain buffer space between the first nut 1 and the second nut 2, so as to avoid the first nut 1 and the second nut 2 not being able to be aligned when installed due to processing errors.

[0041] In a further preferred embodiment, a washer is provided at the bottom of the groove 10. The washer is made of an elastic material such as rubber. By providing the washer, when the groove 10 approaches the boss 3, the boss 3 can squeeze the washer to deform it. This ensures that the first nut 1 and the second nut 2 are in contact. At the same time, the boss 3 squeezes the washer, causing part of the washer to deform and fill the gap on both sides of the contact position between the boss 3 and the groove 10. By filling the gap between the boss 3 and the groove 10, the contact area between the boss 3 and the groove 10 is increased. This effectively increases the locking force of the first nut 1 on the second nut 2, while also increasing the friction between the first nut 1 and the second nut 2, further increasing the damping and improving the anti-loosening effect.

[0042] In this embodiment of the eccentric self-locking anti-loosening nut, the side wall of the groove 10 is inclined, the outer surface of the boss 3 is inclined, and the edge of the boss 3 abuts against the groove 10 to lock the first nut 1 and the second nut 2.

[0043] With the above configuration, as the first nut 1 gradually approaches the second nut 2, the boss 3 guides the groove 10, while preventing friction between the edge of the boss 3 and the groove 10 during the insertion of the boss 3 into the groove 10, which would affect the installation of the second nut 2. The first nut 1 and the second nut 2 are locked together by the abutment between the side wall of the inclined groove 10 and the surface of the inclined boss 3, forming a conical friction pair. This provides additional axial locking force on top of the threaded connection structure. At the same time, the wedge-shaped surface 6 and the bolt teeth abut against each other, forming two locking defenses. The synergistic effect of these dual mechanisms significantly improves the reliability of the anti-loosening mechanism.

[0044] Specifically, the end face of the first nut 1 near the second nut 2 is the supporting end, and the other end face of the first nut 1 is the non-supporting end. The end face of the second nut 2 near the first nut 1 is the non-supporting end, and the other end face of the second nut 2 is the supporting end. The supporting end of the first nut 1 is provided with a conical concave groove 10, and the non-supporting end of the second nut 2 is provided with a conical protrusion 3. The axis of the boss 3 and the second threaded hole 4 has an eccentricity of t. The radius of the groove 10 is the radius of the boss 3 plus the eccentricity.

[0045] With the above setup, after the upper and lower nuts are engaged, the boss 3 abuts against the groove 10, generating a large lateral friction force between them. This friction force can increase the tightness between the nut and the bolt, producing a good anti-loosening effect.

[0046] Preferably, different materials require different eccentricity t and conical slope angles.

[0047] In this embodiment of the eccentric self-locking anti-loosening nut, the first nut 1 and the second nut 2 are coaxially arranged, and the outer diameter of the first nut 1 is equal to the outer diameter of the second nut 2.

[0048] By stacking the two nuts as described above, their outer edges are made flush, preventing misalignment that could lead to uneven force distribution upon impact. Although the second nut 2 has an eccentric design with a boss 3 and a second threaded hole 4 inside, the axis of each threaded hole in the final assembly is coaxial with the bolt axis after the bolt is installed, thus ensuring normal thread engagement and uniform force distribution, and ensuring no off-center load during thread engagement.

[0049] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "rotation", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0050] Although embodiments of the present invention have been shown and described in detail, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An eccentric self-locking anti-loosening nut, characterized in that, It includes a first nut and a second nut. The second nut is embedded on one side of the first nut by a boss. The second nut has a second threaded hole. A wedge-shaped surface is provided on one side of the thread root in the second threaded hole. The boss is eccentrically positioned on the second nut.

2. The eccentric self-locking anti-loosening nut according to claim 1, characterized in that, The second threaded hole has a first inclined surface and a second inclined surface on both sides of the thread root, and the wedge-shaped surface is located between the first inclined surface and the second inclined surface.

3. The eccentric self-locking anti-loosening nut according to claim 2, characterized in that, The angle between the wedge-shaped surface and the axis of the second threaded hole is 30 degrees. When the second nut is connected to the bolt, the tip of the bolt abuts against the wedge-shaped surface.

4. The eccentric self-locking anti-loosening nut according to claim 3, characterized in that, The wedge-shaped surface is perpendicular to the first inclined surface, and the wedge-shaped surface and the second inclined surface form a 150-degree angle.

5. An eccentric self-locking anti-loosening nut according to claim 1, characterized in that, The first nut is located on the side of the second nut where the boss is provided, and the first nut has a groove to accommodate the boss so as to achieve a fitting.

6. An eccentric self-locking anti-loosening nut according to claim 5, characterized in that, The depth of the groove matches the height of the boss, and when the first nut and the second nut are engaged, the root of the boss is flush with the outer edge of the groove.

7. An eccentric self-locking anti-loosening nut according to claim 6, characterized in that, The first nut has a first threaded hole, which is located at the bottom of the groove and is coaxial with the groove.

8. An eccentric self-locking anti-loosening nut according to claim 7, characterized in that, The second threaded hole passes through the second nut and the boss, and the second nut and the first nut are respectively coaxially arranged with the bolt.

9. An eccentric self-locking anti-loosening nut according to claim 5, characterized in that, The sidewall of the groove is inclined, the outer surface of the boss is inclined, and the edge of the boss abuts against the groove to lock the first nut and the second nut.

10. An eccentric self-locking anti-loosening nut according to claim 1, characterized in that, The first nut and the second nut are coaxially arranged, and the outer diameter of the first nut is equal to the outer diameter of the second nut.

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