High-loose-prevention extrusion locking nut structure

Abstract

The utility model relates to fastener technical field provides a high anti -loose extrusion locking nut structure, including the nut male and nut female and second gasket, the nut male includes first gasket and sets up on the nut male bottom of first gasket, the outer ring of nut male bottom is equipped with eccentric connecting block for providing radial contraction space, the bottom fixed connection of nut female has the toothed sheet, when the nut female is sleeved and locked in nut male, the inner wall of nut female extruded nut male bottom, promote the radial contraction of nut male bottom to hold tightly internal bolt, and the toothed sheet abuts on first gasket surface and forms end face antiskid cooperation simultaneously. The utility model discloses through the double locking mechanism of taper face radial hold tightly and end face axial antiskid, has improved the anti -loose effect significantly, at the same time, adopts the design of integral forming and reservation eccentric connecting block, avoids the stress concentration and fracture risk caused by traditional cutting process, improves structural strength and service life.

Description

Technical Field

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

[0002] Screws and nuts, as the most basic mechanical fasteners, are widely used in various mechanical equipment, vehicles, and building structures. In practical applications, especially in equipment operating under high-frequency vibration or variable load conditions, toothed connections often loosen due to frictional attenuation, leading to equipment failure or even safety accidents.

[0003] To address the loosening issue, existing technologies typically employ double nuts against each other or all-metal lock nuts. All-metal lock nuts often involve a tapering process at the nut end, where the nut's teeth are deformed through physical compression, or a cutting edge is made on the nut's end face and flattened. The aim is to utilize the additional friction generated by the elastic deformation during screwing to prevent loosening. However, this structure, achieved through "destructive" cutting or compression deformation, has significant structural defects: firstly, the cutting edge disrupts the continuity of the metal fibers, causing that area to become a stress concentration point, making it prone to brittle fracture during repeated disassembly or forceful tightening, resulting in locking failure; secondly, relying solely on the interference fit of the tooth profile provides limited anti-loosening torque, failing to meet high-strength anti-loosening requirements under extreme conditions. Furthermore, this type of processing is relatively cumbersome, and the yield rate is significantly affected by the heat treatment process. While high-speed rail typically uses two first washers, this invention requires only one, saving costs.

[0004] Therefore, this utility model proposes a high-anti-loosening compression locking nut structure to overcome the shortcomings of the prior art. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a high anti-loosening compression locking nut structure, which aims to improve the problems of insufficient structural strength, easy breakage at the locking point, and low reliability of single friction anti-loosening in the existing technology, which are caused by the traditional anti-loosening nut being manufactured by the cutting and closing process.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: a high-anti-loosening compression locking nut structure, comprising: a nut protrusion and a nut recess and a second washer; as well as the nut protrusion base, the eccentric connecting block, and the toothed plate; The nut has a convex bottom with an eccentric connecting block on the outer ring for providing radial contraction space, and is integral with the first gasket. Furthermore, the nut protrusion, the nut recess, and the bottom of the nut protrusion are connected by the nut recess being sleeved on the outside of the nut protrusion, the inner wall of the nut recess pressing the bottom of the nut protrusion to cause it to shrink radially, and the teeth at the bottom of the nut recess abutting against the surface of the second washer.

[0007] Preferably, the eccentric connecting blocks are evenly distributed along the circumferential direction of the nut's convex bottom, and the distribution center to the conical part is eccentric to achieve locking.

[0008] Preferably, the convex bottom of the nut has a frustum-shaped or conical structure, and the concave interior of the nut has a conical receiving cavity that matches the shape of the convex bottom of the nut.

[0009] Preferably, the toothed plate protrudes radially from the bottom end face of the nut recess, and the hardness of the toothed plate is greater than or equal to the hardness of the second washer.

[0010] Preferably, the first gasket and the nut protrusion are integrally formed.

[0011] Preferably, the eccentric connecting block extends downward from the top of the nut convex base, and the eccentric connecting block penetrates or partially penetrates the sidewall thickness of the nut convex base.

[0012] Preferably, the surface of the second pad is provided with meshing textures or planar contact areas for the toothed plates to be embedded, in order to enhance frictional resistance.

[0013] Preferably, the height of the nut recess is greater than the height of the nut convex base, to ensure that the nut recess can completely cover the eccentric connecting block when locked.

[0014] This utility model has the following beneficial effects: 1. This utility model solves the problem that existing nuts mainly rely on the friction of the teeth to prevent loosening, which is prone to loosening under severe vibration. It achieves the technical effect of using the conical wedge effect to generate a strong radial clamping force to completely lock the bolt teeth, thus significantly improving the reliability of anti-loosening.

[0015] 2. This utility model solves the problem of locking failure caused by relative rotation between the two nuts in a double-nut locking structure by setting a toothed piece at the bottom of the nut recess and abutting against the surface of the second washer. It achieves the technical effect of radial and axial double locking by using end face embedding or high friction meshing to form axial interlocking, preventing the nut recess from turning back.

[0016] 3. This utility model solves the problem of stress concentration and easy breakage during extrusion or disassembly caused by the traditional anti-loosening nut often using a cutting and closing process by integrally molding the nut's convex bottom and the first washer and reserving shrinkage space in the eccentric connecting block. It achieves the technical effect of greatly improving the overall strength of the structure, reducing processing steps, and reducing production costs while ensuring radial shrinkage capacity. Attached Figure Description

[0017] Figure 1 This is a perspective view of a high-anti-loosening compression locking nut structure proposed in this utility model; Figure 2 This is a schematic diagram of a nut recess for a high-anti-loosening compression locking nut structure proposed in this utility model; Figure 3 This is a schematic diagram of the first washer of a high-loosening compression locking nut structure proposed in this utility model; Figure 4 This is a schematic diagram of a nut protrusion of a high-anti-loosening compression locking nut structure proposed in this utility model.

[0018] Legend: 1. Nut concave; 2. Nut convex; 3. Toothed plate; 4. Nut convex bottom; 5. Eccentric connecting block; 6. First washer; 7. Second washer. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Reference Figures 1-4 The present invention provides an embodiment of a high anti-loosening compression locking nut structure, including a nut protrusion 2, a nut recess 1 and a second washer 7 that are fitted and installed on the nut protrusion 2. The nut protrusion 2 serves as the base component for installation and provides a main structure for radial shrinkage deformation. The nut recess 1 provides locking pressure and forms an anti-loosening interlocking structure with the nut protrusion 2. Both the nut protrusion 2 and the nut recess 1 have internal toothed holes in their centers to facilitate toothed connection with external bolts. The outer ring of the nut convex base 4 is provided with an eccentric connecting block 5. The eccentric connecting block 5 is used to provide radial contraction space, so that the nut convex base 4 can contract inward to hold the bolt when it is squeezed by external force. The bottom of the nut recess 1 is fixedly connected with a toothed plate 3, which serves as an anti-slip structural component. Meanwhile, the nut recess 1 has a receiving cavity inside. In the assembled state, the nut recess 1 is fitted and locked onto the nut protrusion 2. The inner wall of the nut recess 1 presses against the bottom 4 of the nut protrusion, causing the bottom 4 of the nut protrusion to undergo elastic deformation and radial contraction, thereby tightly holding the internal bolt. At the same time, the toothed plate 3 at the bottom of the nut recess 1 abuts against the surface of the second washer 7 to form an anti-slip fit. By embedding or pressing the first washer 6 with the toothed plate 3, the frictional resistance between the two is increased, effectively preventing the nut recess 1 from loosening or reversing. As a preferred embodiment, in order to ensure uniform force distribution and shrinkage effect, the eccentric connecting block 5 is evenly distributed along the circumference of the nut convex bottom 4, ensuring that the clamping force of the nut convex bottom 4 on the internal bolt is consistent in all directions when shrinking, and the center to the conical part achieves eccentric locking. As another preferred embodiment, in order to optimize the tightness of the fit, the nut convex bottom 4 is in the shape of a frustum or a cone, and the nut recess 1 has a conical receiving cavity that matches the shape of the nut convex bottom 4. By utilizing the principle of conical surface fit, the axial locking force of the nut recess 1 can be efficiently converted into the radial compressive force of the nut convex bottom 4. As a further preferred embodiment, in order to improve the anti-slip performance, the toothed plate 3 protrudes radially from the bottom end face of the nut recess 1, and the material hardness of the toothed plate 3 is greater than or equal to the material hardness of the second washer 7, so as to ensure that the toothed plate 3 can effectively press into or bite the surface of the second washer 7. In addition, the first washer 6 and the nut convex base 4 are integrally formed. Compared with the traditional cutting process, the integrally formed structure has higher strength, and the outer contour of the first washer 6 is hexagonal to withstand the torque of the tightening tool, which facilitates installation and operation. Regarding the specific form of the eccentric connecting block 5, the eccentric connecting block 5 extends downward from the top of the nut convex bottom 4, and the eccentric connecting block 5 penetrates or partially penetrates the side wall thickness of the nut convex bottom 4, which can be flexibly adjusted according to actual strength requirements. To further enhance locking reliability, the surface of the second washer 7 is provided with meshing textures or planar contact areas for the toothed piece 3 to be embedded in, and the height of the nut recess 1 is greater than the height of the nut convex base 4, so as to ensure that the nut recess 1 can completely cover the eccentric connecting block 5 when locked, providing complete protection and locking function.

[0021] Working principle: When performing the installation and locking operation, first screw the nut protrusion 2 onto the external bolt to be locked until it fits against the mounting surface. Then screw the nut recess 1 into the bolt and screw it in the direction of the nut protrusion 2. As the nut recess 1 is tightened, the conical receiving cavity wall inside the nut recess 1 begins to contact and press the nut protrusion bottom 4 at the top of the nut protrusion 2 to achieve a strong connection using the mortise and tenon structure. At the same time, the first washer 6 at one end of the nut protrusion 2 abuts against the end of the nut recess 1. Because the outer ring of the nut convex base 4 is provided with an eccentric connecting block 5, the eccentric connecting block 5 provides the nut convex base 4 with a radial compression margin. Under the axial pressure applied by the nut concave 1, the nut convex base 4 is forced to undergo radial contraction deformation, thereby causing the inner toothed plate of the nut convex base 4 to tightly hold the toothed plate of the outer bolt, generating a strong radial locking force. This holding effect eliminates the toothed plate mating clearance and fundamentally prevents loosening. While the above-mentioned compression and locking are in place, the toothed piece 3 located at the bottom of the nut recess 1 abuts against and presses against the surface of the second washer 7. The toothed piece 3 and the planar toothed grooves on the surface of the second washer 7 interlock with each other to form a rigid interlock. This end-face anti-slip fit effectively prevents the nut recess 1 from rotating back relative to the nut protrusion 2, achieving a double anti-loosening and anti-vibration effect. Furthermore, compared to the traditional process of directly cutting edges on the nut to create deformation, this nut protrusion 2 is manufactured using a one-piece molding process. The structural shape of the eccentric connecting block 5 allows the nut protrusion base 4 to distribute stress more evenly under severe compression, avoiding the risk of stress concentration and breakage that is common at traditional cut edges. This significantly improves the overall structural strength and durability while reducing processing steps. The protruding part of the nut protrusion base 4 has an eccentric structural design. Compared to the traditional structure with slots directly cut on it, this eccentric design can achieve the same pre-tightening shrinkage. After the two nut structures are tightened, this solid eccentric structure has higher structural strength and can withstand higher stresses compared to eccentric connecting block products with slots or pre-tightening shrinkage on all sides. It is more suitable for heavy-duty trucks or lorries.

Claims

1. A high-resistance anti-loosening compression locking nut structure, characterized in that, Includes a nut protrusion (2), a nut recess (1), and a second washer (7); The nut protrusion (2) includes a first washer (6) and a nut protrusion bottom (4) disposed on the first washer (6). Both the nut protrusion (2) and the nut recess (1) have internal toothed holes at their centers. The outer ring of the nut convex bottom (4) is provided with an eccentric connecting block (5), which is used to provide radial shrinkage space; The bottom of the nut recess (1) is fixedly connected to a toothed piece (3); When the nut recess (1) is fitted and locked onto the nut protrusion (2), the inner wall of the nut recess (1) presses against the bottom (4) of the nut protrusion, and the toothed plate (3) abuts against the surface of the second washer (7) to form an anti-slip fit.

2. The high anti-loosening compression locking nut structure according to claim 1, characterized in that: The eccentric connecting block (5) is evenly distributed along the circumferential direction of the nut convex bottom (4), and the center to the conical part is eccentric to achieve locking.

3. The high anti-loosening compression locking nut structure according to claim 1, characterized in that: The nut bottom (4) has a frustum or cone-shaped structure, and the nut recess (1) has a cone-shaped receiving cavity that matches the shape of the nut bottom (4).

4. The high anti-loosening compression locking nut structure according to claim 1, characterized in that: The toothed plate (3) protrudes radially from the bottom end face of the nut recess (1), and the material hardness of the toothed plate (3) is greater than or equal to the material hardness of the second washer (7).

5. The high anti-loosening compression locking nut structure according to claim 1, characterized in that: The first gasket (6) and the nut convex bottom (4) are integrally formed.

6. The high anti-loosening compression locking nut structure according to claim 1, characterized in that: The eccentric connecting block (5) extends downward from the top of the nut convex bottom (4), and the eccentric connecting block (5) penetrates or partially penetrates the side wall thickness of the nut convex bottom (4).

7. The high anti-loosening compression locking nut structure according to claim 1, characterized in that: The surface of the second gasket (7) is provided with meshing textures or planar contact areas for the toothed plate (3) to be embedded.

8. The high anti-loosening compression locking nut structure according to claim 1, characterized in that: The height of the nut recess (1) is greater than the height of the nut protrusion (4) to ensure that the nut recess (1) can completely cover the eccentric connecting block (5) when locked.

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