A self-locking anti-loosening nut

Abstract

This utility model discloses a self-locking anti-loosening nut, comprising a nut body, a stabilizing pad fixedly connected to the bottom of the nut body, and a self-locking mechanism provided on the upper part of the nut body. The self-locking mechanism includes a positioning plate fixedly connected to the top of the nut body, a chuck inserted inside the positioning plate, and a self-locking seat fixedly provided on the inner ring surface of the chuck. This self-locking anti-loosening nut requires no special processing, such as drilling or grooving, and can be directly used with standard threaded bolts, offering high compatibility and reducing special requirements for matching parts. It does not reduce the strength of the nut body and will not deform under tightening force. The modular design ensures that the lifespan of the nut body is not affected by the wear and tear of the self-locking mechanism, significantly improving the product's durability and economy. The replacement process is simple, requiring no professional tools or complex procedures, reducing maintenance difficulty and time costs, and is especially suitable for rapid on-site repairs.

Description

Technical Field

[0001] This utility model relates to the field of fasteners, specifically a self-locking anti-loosening nut. Background Technology

[0002] Traditional methods for preventing nuts from loosening typically involve adding a washer underneath the nut to increase friction and extend its lifespan. However, for rail transit brake discs, which move with the wheels and experience frequent and intense vibrations on trains, this conventional method cannot increase friction enough. Therefore, special anti-loosening nuts must be used to secure the brake disc to the wheel.

[0003] Regarding patents for anti-loosening nuts, a search revealed Chinese patent CN201547107U, which discloses an elastic anti-loosening nut. The patent includes a nut body with a threaded hole made of elastic material. The nut body has a radially slit on its side, which penetrates the nut body. A boss is provided on the upper end face of the nut body corresponding to the slit. When the elastic anti-loosening nut is tightened, the surface of the fixed object presses against the boss.

[0004] Although the above-mentioned device can cause the nut body above the cut to tilt and deform towards the cut by the pressure of the boss, and the tightening force generated by the deformation of the threads of the nut body above the cut can further prevent the elastic lock nut from loosening, without the need for additional washers, it is simple to process and convenient to use. However, in actual use, the cut is opened on the outer circumference of the lock nut. The setting of the cut directly reduces the material used in the lock nut, making it easy for the lock nut to deform when tightened with tools, resulting in low strength and unusability. Utility Model Content

[0005] The purpose of this invention is to provide a self-locking anti-loosening nut to solve the defects mentioned in the background art.

[0006] To achieve the above objectives, a self-locking anti-loosening nut is provided, comprising a nut body, a stabilizing pad fixedly connected to the bottom of the nut body, and a self-locking mechanism provided on the upper part of the nut body. The self-locking mechanism includes a positioning plate fixedly connected to the top of the nut body, a chuck inserted inside the positioning plate, and a self-locking seat fixedly provided on the inner ring surface of the chuck.

[0007] Furthermore, the nut body and the stabilizing pad are concentric circles, the stabilizing pad has a trapezoidal cross-section, and the bottom of the stabilizing pad has multiple sets of grooves at equal intervals, the grooves having a triangular cross-section.

[0008] Furthermore, the self-locking mechanism also includes a self-locking opening, a notch, a locking plate, and a positioning space. The positioning space is U-shaped inside the positioning disc.

[0009] Furthermore, the positioning space is adapted to the size of the chuck, the chuck is annular, and the chuck is inserted into the interior of the positioning space.

[0010] Furthermore, the chuck and the self-locking seat are in a concentric circle structure, and a circular self-locking opening is provided in the middle of the self-locking seat. The diameter of the self-locking opening is smaller than the diameter of the screw hole of the nut body.

[0011] Furthermore, five sets of notches are evenly opened on the inner ring surface of the self-locking seat, and five sets of locking plates are fixedly installed on the inner side of the self-locking seat. The self-locking seat and the chuck are detachable structures inside the positioning space.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. This solution restores the self-locking function of a nut when the locking plate wears, deforms, or breaks due to long-term use, without replacing the entire nut. Simply remove the self-locking seat from the positioning space and replace it with a new one. The modular design ensures that the lifespan of the nut body is not affected by the wear and tear of the self-locking mechanism, significantly improving the product's durability and economy. The replacement process is simple, requiring no professional tools or complex procedures, reducing maintenance difficulty and time costs, making it especially suitable for rapid on-site repairs.

[0014] 2. This solution features five sets of equidistant locking plates inside the self-locking seat. These plates engage with the outer side of the threaded structure on the bolt. When the nut is screwed onto the bolt, the five sets of equidistant locking plates engage with the thread, achieving self-locking of the nut. The five sets of equidistant locking plates directly engage with the outer side and between the teeth of the bolt thread, forming a physical engagement rather than relying solely on friction to prevent loosening. This effectively resists loosening caused by high-frequency vibration, impact, and temperature changes. No special processing of the nut is required, such as drilling or grooving; it can be directly used with standard threaded bolts, offering high compatibility and reducing special requirements for matching parts. It does not reduce the strength of the nut and will not deform under tightening force. Attached Figure Description

[0015] Figure 1 This is a front view schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a bottom view of the anti-loosening nut structure of this utility model;

[0017] Figure 3 This is a top view of the anti-loosening nut structure of this utility model;

[0018] Figure 4 This is an exploded view of the anti-loosening nut of this utility model.

[0019] Figure 5 This is a cross-sectional view of the anti-loosening nut of this utility model;

[0020] Figure 6 This is a schematic diagram of the interlocking structure of the self-locking seat and positioning plate of this utility model.

[0021] The following are the labels in the diagram: 1. Nut body; 2. Stabilizing pad; 21. Groove; 3. Self-locking mechanism; 31. Self-locking seat; 310. Self-locking port; 32. Chuck; 33. Notch; 34. Locking plate; 35. Positioning plate; 36. Positioning space. Detailed Implementation

[0022] Please see Figure 1-6 This utility model provides a self-locking anti-loosening nut, including a nut body 1, a stabilizing pad 2 fixedly connected to the bottom of the nut body 1, a self-locking mechanism 3 provided on the upper part of the nut body 1, the self-locking mechanism 3 including a positioning plate 35 fixedly connected to the top of the nut body 1, a chuck 32 inserted inside the positioning plate 35, and a self-locking seat 31 fixedly provided on the inner ring surface of the chuck 32.

[0023] In a preferred embodiment, the nut body 1 and the stabilizing pad 2 are concentric circles. The cross-section of the stabilizing pad 2 is trapezoidal. Multiple sets of grooves 21 are equidistantly provided at the bottom of the stabilizing pad 2. The cross-section of the grooves 21 is triangular.

[0024] like Figure 2 and Figure 5 As shown: The bottom of the stabilizing pad 2 has multiple sets of grooves 21 evenly spaced. When the nut body 1 is tightened onto the wood, the multiple sets of grooves 21 can be embedded and fixed inside the wood. The physical interlocking between the grooves 21 and the wood increases the contact area and friction, enhances the holding force of the nut on the wood, effectively prevents the nut from loosening due to the softness of the wood, its easy deformation, or the influence of vibration. At the same time, it disperses the pressure during tightening, avoids excessive local pressure on the wood and cracking, improves the stability and firmness of the connection, and ensures that the fastening effect of the nut on the wood is more reliable.

[0025] The self-locking mechanism 3 also includes a self-locking port 310, a notch 33, a locking plate 34, and a positioning space 36. The positioning plate 35 has a positioning space 36 inside, and the positioning space 36 is U-shaped.

[0026] The positioning space 36 is adapted to the size of the chuck 32, which is ring-shaped and inserted into the interior of the positioning space 36.

[0027] The chuck 32 and the self-locking seat 31 are in a concentric circle structure. The self-locking seat 31 has a circular self-locking opening 310 in the middle. The diameter of the self-locking opening 310 is smaller than the diameter of the screw hole of the nut body 1.

[0028] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown: Five sets of locking plates 34 are equidistantly distributed, and the clamping force is evenly distributed on multiple contact points of the bolt thread, avoiding excessive force on a single point that could cause thread deformation or damage; the self-locking mechanism 3 is integrated on the top of the nut body 1, without requiring additional axial or radial space, making it suitable for space-constrained scenarios such as inside equipment and precision instruments, and saving more space compared to the combination of traditional nut anti-loosening washers.

[0029] As a preferred embodiment, five sets of notches 33 are evenly provided on the inner ring surface of the self-locking seat 31, and five sets of locking plates 34 are fixedly provided on the inner side of the self-locking seat 31. The self-locking seat 31 and the chuck 32 are detachable structures inside the positioning space 36.

[0030] like Figure 1 and Figure 5 As shown: When disassembly is required, the locking plate 34 can be disengaged from the thread by rotating the nut in the reverse direction, without affecting the secondary use of the bolt and nut; even if the locking plate 34 is damaged and cannot be used, the self-locking seat 31 can be removed from the self-positioning space 36 and a new self-locking seat 31 can be replaced, and the nut body 1 can still be used normally; when the locking plate 34 is worn, deformed or damaged due to long-term use, it is not necessary to replace the entire nut, only the self-locking seat 31 needs to be removed from the positioning space 36 and a new self-locking seat 31 needs to be replaced to restore the nut's self-locking function; the modular design ensures that the lifespan of the nut body 1 is not affected by the wear and tear of the self-locking mechanism 3, greatly improving the product's durability and economy; the replacement process is simple, requiring no professional tools or complex procedures, reducing maintenance difficulty and time costs, and is especially suitable for rapid on-site repair; replacement can be made according to different working conditions. Different specifications of self-locking seats 31, such as locking plates 34 with different hardness and quantity, allow the same nut body 1 to adapt to various scenarios, enhancing the product's versatility. Replacing only the worn self-locking components instead of the entire nut reduces the consumption of metal materials and waste generation, aligning with the trends of green manufacturing and circular economy. For industries that use nuts in batches, it can significantly reduce the disposal costs of scrapped parts and the environmental burden. After replacing the self-locking seat 31, the nut's connection strength and self-locking performance can be fully restored to their initial state, ensuring that the maintained equipment can still operate stably and reducing safety hazards caused by improper maintenance. Through its reusable and modular replacement features, it achieves multiple optimizations in terms of economy, maintainability, flexibility, and environmental protection, making it particularly suitable for cost-sensitive industrial scenarios that require frequent maintenance or have variable operating conditions. It is a highly efficient design that balances functionality and practicality.

[0031] Working Principle: In actual use, the fixing bolt passes through the through hole on the fixing part and is screwed into the nut body 1 for fixation. The nut body 1 is equipped with a self-locking mechanism 3, and a self-locking seat 31 is located on top of the self-locking mechanism 3. When the nut body 1 is screwed onto the bolt, the thread on the bolt passes through the self-locking seat 31. Since the self-locking seat 31 has five sets of equidistantly distributed locking plates 34 inside, these locking plates 34 engage with the outer side of the threaded structure on the bolt. When the nut body 1 is screwed and tightened onto the bolt, the five sets of equidistantly distributed locking plates 34 are locked inside the thread, completing the self-locking function of the nut body 1. The five sets of equidistantly distributed locking plates 34 directly engage with the outer side and between the teeth of the bolt thread, forming a physical interlock, rather than relying solely on friction to prevent loosening. This effectively resists loosening caused by high-frequency vibration, impact, and temperature changes, and is especially suitable for strong vibration scenarios such as automotive engines, construction machinery, and rail transportation. The five sets of equidistantly distributed locking plates 34 can evenly tighten from multiple angles. The threaded design prevents locking failure caused by uneven local stress, and compared to single or asymmetrical locking plates 34, it can maintain preload more stably. The engagement between the locking plate 34 and the thread is a "rigid lock," and the locking force will not decrease due to long-term use. Even under long-term load or repeated vibration, the locking plate 34 can still maintain the engagement with the thread, reducing the frequency of periodic inspections and retightening, and saving maintenance costs. For hard-to-access or maintain parts, this durable self-locking performance can significantly improve the security of the connection. The self-locking mechanism 3 is integrated into the nut body 1, and can be installed by simply screwing it on like a regular nut, without the need for additional anti-loosening washers, cotter pins, glue, or other auxiliary parts, simplifying the assembly process and improving work efficiency. No special processing is required for the nut, such as drilling or slotting, and it can be directly used with standard threaded bolts, with high compatibility, reducing special requirements for matching parts, without reducing the strength of the nut body 1, and without deformation when tightened.

Claims

1. A self-locking anti-loosening nut, comprising a nut body (1), characterized in that: A stabilizing pad (2) is fixedly connected to the bottom of the nut body (1), and a self-locking mechanism (3) is provided on the upper part of the nut body (1). The self-locking mechanism (3) includes a positioning plate (35) fixedly connected to the top of the nut body (1). A chuck (32) is inserted inside the positioning plate (35), and a self-locking seat (31) is fixedly provided on the inner ring surface of the chuck (32).

2. The self-locking anti-loosening nut according to claim 1, characterized in that: The nut body (1) and the stabilizing pad (2) are in a concentric circle structure. The cross section of the stabilizing pad (2) is trapezoidal. Multiple sets of grooves (21) are equidistantly provided at the bottom of the stabilizing pad (2). The cross section of the grooves (21) is triangular.

3. The self-locking anti-loosening nut according to claim 1, characterized in that: The self-locking mechanism (3) also includes a self-locking port (310), a notch (33), a locking piece (34) and a positioning space (36). The positioning disk (35) has a positioning space (36) inside, and the positioning space (36) is U-shaped.

4. A self-locking anti-loosening nut according to claim 3, characterized in that: The positioning space (36) is adapted to the size of the chuck (32), which is annular and is inserted into the interior of the positioning space (36).

5. A self-locking anti-loosening nut according to claim 4, characterized in that: The chuck (32) and the self-locking seat (31) are in a concentric circle structure. The self-locking seat (31) has a circular self-locking opening (310) in the middle. The diameter of the self-locking opening (310) is smaller than the diameter of the screw hole of the nut body (1).

6. A self-locking anti-loosening nut according to claim 5, characterized in that: Five sets of notches (33) are evenly opened on the inner ring surface of the self-locking seat (31), and five sets of locking plates (34) are fixedly installed on the inner side of the self-locking seat (31). The self-locking seat (31) and the chuck (32) are detachable structures inside the positioning space (36).

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