Lock nut
Patent Information
- Application Number
- CN202522546813.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-01
- Publication Date
- 2026-09-15
- Estimated Expiration
- 2035-12-01
AI Technical Summary
但尼龙锁紧螺母存在显著应用局限：其内嵌尼龙圈经2-3次装配拆卸后，会因反复挤压作用产生不可逆塑性变形，导致尼龙圈与螺纹贴合面的接触压力大幅衰减，防松性能无法满足使用要求，必须定期更换螺母或者尼龙圈，这一特性使得该类型螺母在需要频繁拆装的工况中，不仅会增加零部件更换的直接成本，还会因拆装维护占用额外工时，显著提升设备长期运行的累计使用成本，因此，针对上述问题提出一种防松螺母
本实用新型中，通过设置的限位组件、预紧组件和动力组件，装置能够为螺纹副提供持续稳定的预紧摩擦阻力，有效保障防松性能的可靠性，规避了尼龙圈因反复拆装产生不可逆塑性变形导致防松失效的问题，可适配频繁拆卸的工作场景，无需定期更换螺母或相关部件，既简化了拆装维护流程、减少了工时消耗，又降低了零部件更换的直接成本与设备长期运行的累计使用成本，兼顾了防松效果与使用经济性。
Smart Images
Figure CN224756138U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of nut technology, specifically to an anti-loosening nut. Background Technology
[0002] Nuts are basic components used in the mechanical manufacturing field in conjunction with bolts, screws and other externally threaded fasteners. They are usually hexagonal or circular in shape and have internal threads. They achieve a detachable connection with fasteners through the thread engagement principle. Their core functions are to fix the position of the connecting parts, transmit loads and ensure the stability of the assembly structure. Their materials include carbon steel, stainless steel and non-ferrous metals. Different strength grades and corrosion resistance types can be selected according to working conditions. They are widely used in mechanical equipment, construction engineering, automobile manufacturing, aerospace and other industries and are an indispensable key basic component in modern industrial production. The core implementation path of the current friction-based anti-loosening technology is to increase the friction between the threaded pairs. Specifically, the anti-loosening effect is achieved through two types of structural designs: nylon lock nuts use the extrusion fit between the embedded nylon ring and the bolt thread to form contact pressure, while metal lock nuts rely on their own structural elastic deformation to generate continuous preload. Both of them suppress the relative rotation of the threaded pairs by strengthening the frictional resistance. However, nylon lock nuts have significant application limitations: after 2-3 assembly and disassembly cycles, the embedded nylon ring undergoes irreversible plastic deformation due to repeated compression, resulting in a significant decrease in the contact pressure between the nylon ring and the threaded mating surface. Consequently, the anti-loosening performance fails to meet usage requirements, necessitating periodic replacement of the nut or nylon ring. This characteristic means that in operating conditions requiring frequent disassembly and assembly, this type of nut not only increases the direct cost of parts replacement but also consumes additional labor time for disassembly and maintenance, significantly increasing the cumulative operating cost of the equipment over the long term. Therefore, an anti-loosening nut is proposed to address the above issues. Utility Model Content
[0003] The purpose of this invention is to provide an anti-loosening nut to solve the problems mentioned in the background art.
[0004] To achieve the above objectives, this utility model provides the following technical solution: A locking nut includes a nut assembly. A limiting component is installed at the upper end of the nut assembly. A power component is installed inside the nut assembly. A pre-tightening component is fixedly connected to the top of the power component. The pre-tightening component includes an annular brake disc with a pre-tightening thread groove on its inner side. The nut assembly includes a nut body with a blind hole on its inner side. A welding ring is welded to the blind hole near its upper end. The power component includes a rubber airbag with a liquid storage chamber and a hollow channel on its inner side. An expansion shell is attached to the upper end of the rubber airbag. A cylindrical shell is fixedly connected to the top of the expansion shell. Weight reduction grooves are provided on the inner sides of both the expansion shell and the cylindrical shell.
[0005] As a further optimization of this utility model, the limiting component includes an operating extension cylinder, a pressure ring is fixedly connected to the bottom end of the operating extension cylinder, and both the operating extension cylinder and the pressure ring have release openings at their right ends, with an insert block fixedly connected to the outside of the release opening.
[0006] As a further optimization of this utility model, the inner diameter of the operating extension cylinder is 1.1 times the diameter of the pre-tightening thread groove, the span before and after the disengagement is 1.1 times the opening diameter of the threaded hole, and the diameter of the threaded hole is the same as the diameter of the pre-tightening thread groove.
[0007] As a further optimization of this utility model, the insert block can be inserted into the interior of the cover through the split port, the bottom end of the pressure ring can be pressed against the upper end of the annular brake disc, and the operating extension cylinder can limit the position of the annular brake disc by rotating 30 degrees.
[0008] As a further optimization of this utility model, the split opening is located at the upper end of the cover, and the bottom end of the cover is fixedly connected to the top end of the nut body.
[0009] As a further optimization of this utility model, the rubber airbag is placed inside the blind hole, the outer diameter of the rubber airbag is 0.9 times the diameter of the blind hole, the expansion shell is inserted into the blind hole, the expansion shell is located at the upper end of the rubber airbag, and the outer side of the expansion shell is in contact with the inner side of the blind hole.
[0010] As a further optimization of this utility model, the bottom end of the annular brake disc is welded and fixed to the top end of the cylindrical shell, and the annular brake disc is embedded and installed inside the cover.
[0011] Compared with the prior art, the beneficial effects of this utility model are: In this invention, the device provides a continuous and stable pre-tightening frictional resistance to the threaded pair through the setting of the limiting component, pre-tightening component, and power component, effectively ensuring the reliability of the anti-loosening performance. It avoids the problem of anti-loosening failure caused by irreversible plastic deformation of nylon rings due to repeated disassembly and assembly. It can be adapted to work scenarios with frequent disassembly and assembly, and there is no need to replace nuts or related parts regularly. It simplifies the disassembly and maintenance process, reduces labor time consumption, and reduces the direct cost of parts replacement and the cumulative use cost of long-term equipment operation, thus balancing the anti-loosening effect and the economy of use. Attached Figure Description
[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is an exploded structural diagram of the entire utility model; Figure 3 This is a cross-sectional view of the overall structure of this utility model; Figure 4This is a schematic diagram of the limiting component structure of this utility model; Figure 5 This is a schematic diagram of the nut assembly structure of this utility model; Figure 6 This is a schematic diagram of the pre-tightening component structure of this utility model; Figure 7 This utility model Figure 6 A schematic diagram of the structure at point A.
[0013] In the diagram: 1. Limiting component; 11. Operating extension cylinder; 12. Pressure ring; 13. Release valve; 14. Insert block; 2. Preload assembly; 21. Annular brake disc; 22. Preload thread groove; 3. Nut assembly; 31. Nut body; 32. Threaded hole; 33. Cover; 34. Split end; 35. Blind hole; 36. Welding ring; 4. Power assembly; 41. Rubber airbag; 42. Liquid reservoir; 43. Hollow channel; 44. Expansion shell; 45. Cylinder shell; 46. Weight reduction groove. Detailed Implementation
[0014] 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.
[0015] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.
[0016] Please see Figures 1-7 This utility model provides a technical solution: A locking nut includes a nut assembly 3, a limit component 1 installed at the upper end of the nut assembly 3, a power component 4 installed inside the nut assembly 3, a pre-tightening component 2 fixedly connected to the top of the power component 4, the pre-tightening component 2 including an annular brake disc 21, a pre-tightening thread groove 22 opened inside the annular brake disc 21, the nut assembly 3 including a nut body 31, a blind hole 35 opened inside the nut body 31, a welding ring 36 welded near the upper end of the blind hole 35, the power component 4 including a rubber air bladder 41, a liquid storage chamber 42 and a hollow channel 43 provided inside the rubber air bladder 41, an expansion shell 44 tightly attached to the upper end of the rubber air bladder 41, a cylindrical shell 45 fixedly connected to the top of the expansion shell 44, and weight reduction grooves 46 opened inside both the expansion shell 44 and the cylindrical shell 45.
[0017] As a further implementation of this solution, the limiting component 1 includes an operating extension cylinder 11. A pressure ring 12 is fixedly connected to the bottom end of the operating extension cylinder 11. Both the operating extension cylinder 11 and the pressure ring 12 have a release opening 13 on their right ends. An insert block 14 is fixedly connected to the outside of the release opening 13. Through the above settings, the precise pressing of the pressure ring 12 onto the annular brake disc 21 and the limiting cooperation of the insert block 14 ensure that the annular brake disc 21 is subjected to uniform force during assembly, laying a structural foundation for the stability of the pre-tightening friction resistance of the subsequent threaded pair. At the same time, the cooperation between the insert block 14 and the split opening 34 allows the insert block 14 to be disengaged from the inside of the cover 33, and the opening of the release opening 13 allows the operating extension cylinder 11 to be disengaged from the screw through the release opening 13. As a further implementation of this solution, the inner diameter of the operating extension cylinder 11 is 1.1 times the diameter of the pre-tightening thread groove 22, the span width before and after the release 13 is 1.1 times the opening diameter of the threaded hole 32, and the diameter of the threaded hole 32 is the same as the diameter of the pre-tightening thread groove 22. Through the above settings, the reasonable size ratio not only ensures the compatibility between the operating extension cylinder 11 and the pre-tightening thread groove 22, and between the release 13 and the threaded hole 32, avoiding assembly interference, but also reserves sufficient space for the threaded connection of the screw with the pre-tightening thread groove 22 and the threaded hole 32, ensuring the reliability of the connection. As a further implementation of this solution, the insert block 14 can be inserted into the interior of the cover 33 through the split port 34, and the bottom end of the pressure ring 12 can be pressed against the upper end of the annular brake disc 21. The operating extension cylinder 11 can limit the position of the annular brake disc 21 by rotating it thirty degrees. Through the above settings, this structural design realizes the rapid positioning and limiting of the annular brake disc 21, simplifies the assembly steps, shortens the working time, and at the same time, the rotation limiting method can ensure the positional stability of the annular brake disc 21 during the assembly process, providing precise structural support for the deformation of the rubber airbag 41 and the generation of pre-tightening force. As a further implementation of this solution, the split port 34 is located at the upper end of the cover 33, and the bottom end of the cover 33 is fixedly connected to the top end of the nut body 31. Through the above setting, the split port 34 provides precise guidance for the insertion of the insert block 14, ensuring assembly accuracy. The fixed connection between the cover 33 and the nut body 31 enhances the overall structural strength of the device and improves the service life and anti-loosening performance stability of the device. As a further implementation of this solution, the rubber airbag 41 is placed inside the blind hole 35, and the outer diameter of the rubber airbag 41 is 0.9 times the diameter of the blind hole 35. The expansion shell 44 is inserted into the blind hole 35 and is located at the upper end of the rubber airbag 41. The outer side of the expansion shell 44 fits against the inner side of the blind hole 35. Through the above arrangement, the size matching between the rubber airbag 41 and the blind hole 35 provides sufficient deformation space for the rubber airbag 41, ensuring the stable output of its deformation recovery force. The fitting design between the expansion shell 44 and the blind hole 35 ensures the effective transmission of force, so that the deformation recovery force of the rubber airbag 41 can be accurately applied to the annular brake disc 21, thereby providing a continuous and stable pre-tightening frictional resistance for the threaded pair and improving the reliability of anti-loosening. As a further implementation of this solution, the bottom end of the annular brake disc 21 is welded and fixed to the top end of the cylindrical shell 45. The annular brake disc 21 is embedded and installed inside the cover 33. Through the above settings, the welding and fixing enhances the connection strength between the annular brake disc 21 and the cylindrical shell 45, ensuring the effectiveness of force transmission. The embedded installation method improves the installation stability of the annular brake disc 21. Combined with the material characteristics of the ductile iron of the annular brake disc 21, it can maintain a stable friction force between the annular brake disc 21 and the screw, avoiding the problem of easy deformation and failure of traditional nylon rings, adapting to frequent disassembly scenarios, and reducing the cost of use.
[0018] Workflow: During production, the extension cylinder 11, annular brake disc 21, nut body 31, rubber airbag 41, expansion shell 44, and cylinder shell 45 are all pre-finished products. At this time, the cover 33 is separate from the nut body 31. The rubber airbag 41 is inserted into the blind hole 35, and the welding ring 36 is fitted onto the outside of the cylinder shell 45. Then, multiple cylinder shells 45 are welded in a circular array around the annular brake disc 21 at the bottom of the annular brake disc 21, with the expansion shell 44 facing downwards. The expansion shell 44 and cylinder shell 45 are inserted into the blind hole 35, and the welding ring 36 is welded and fixed to the upper end of the blind hole 35 in the nut body 31. At this time, the expansion shell 44 is in contact with the top of the rubber airbag 41, and the cover 33 is fitted onto the outside of the annular brake disc 21. The cover 33 is welded and fixed to the nut body 31. Then, multiple insert blocks 14 are aligned vertically with the split opening 34. Insert 14 is inserted into the interior of cover 33 through split 34. During this process, pressure ring 12 will squeeze annular brake disc 21. Annular brake disc 21 pushes cylindrical shell 45 and extension shell 44 downward. Extension shell 44 squeezes rubber airbag 41. Rubber airbag 41 deforms into the space left in hollow channel 43. Hydraulic oil is refilled inside reservoir 42. This ensures the regularity of volume change within the working temperature range of 20℃-120℃. Through the deformation recovery force of rubber airbag 41, extension shell 44 and cylindrical shell 45 push annular brake disc 21 to maintain an upward trend. When rotating operating extension cylinder 11 at about 30 degrees, the end of insert 14 near the upper end is chamfered, which can improve the smoothness of rotation of operating extension cylinder 11. Through the pressure ring 12 limiting annular brake disc 21, it is convenient for the rear screw threaded connection to the inside of threaded hole 32 and pre-tightened thread groove 22. In use, the nut body 31 is oriented downwards and threaded into the screw through the threaded hole 32. Once the screw enters the pre-tightening thread groove 22, it will be threaded into the groove. After the nut body 31 is installed, the operating extension tube 11 is removed. The operating extension tube 11 is rotated until the insert 14 aligns with the opening 34. The outer diameter of the pressure ring 12 is 0.99 times the inner diameter of the upper end of the cover 33. The insert 14 and pressure ring 12 can then be removed from the inside of the cover 33. At this point, the deformation recovery force of the rubber airbag 41 causes the expansion shell 44, the cylinder shell 45, and the annular brake disc 21 to move upwards, thereby improving the pre-tightening effect. The friction between the threaded groove 22 and the screw is reduced. The annular brake disc 21 is made of gray cast iron, which has a stable coefficient of friction, good toughness, is not easy to crack due to braking impact, and has high wear resistance. This allows the annular brake disc 21 and the screw to maintain a stable friction force. It changes the continuous pre-tightening force generated by the deformation of the nylon ring to enhance frictional resistance and inhibit the relative rotation of the threaded pair. This anti-loosening setting not only ensures that the screw and the annular brake disc 21 maintain a continuous and stable pre-tightening frictional resistance to improve the loosening performance, but is also suitable for use in working environments with frequent disassembly. This not only reduces the tedium of frequent replacement, but also reduces the cost pressure caused by frequent replacement.
[0019] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations 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. A locking nut, comprising a nut assembly (3), characterized in that: The upper end of the nut assembly (3) is equipped with a limit component (1), the inner side of the nut assembly (3) is equipped with a power component (4), and the top end of the power component (4) is fixedly connected with a pre-tightening component (2). The pre-tightening assembly (2) includes an annular brake disc (21), and a pre-tightening threaded groove (22) is provided on the inner side of the annular brake disc (21). The nut assembly (3) includes a nut body (31), a blind hole (35) is provided on the inner side of the nut body (31), and a welding ring (36) is welded to the blind hole (35) near the upper end. The power assembly (4) includes a rubber airbag (41), with a liquid storage chamber (42) and a hollow channel (43) provided inside the rubber airbag (41). An expansion shell (44) is attached to the upper end of the rubber airbag (41), and a cylindrical shell (45) is fixedly connected to the top of the expansion shell (44). Weight reduction grooves (46) are provided inside the expansion shell (44) and the cylindrical shell (45).
2. The anti-loosening nut according to claim 1, characterized in that: The limiting component (1) includes an operating extension tube (11), a pressure ring (12) is fixedly connected to the bottom end of the operating extension tube (11), and a release opening (13) is opened at the right end of both the operating extension tube (11) and the pressure ring (12), and an insert block (14) is fixedly connected to the outside of the release opening (13).
3. The anti-loosening nut according to claim 2, characterized in that: The inner diameter of the operating extension cylinder (11) is 1.1 times the diameter of the pre-tightening thread groove (22), the span width before and after the release (13) is 1.1 times the opening diameter of the threaded hole (32), and the diameter of the threaded hole (32) is the same as the diameter of the pre-tightening thread groove (22).
4. The anti-loosening nut according to claim 2, characterized in that: The insert (14) can be inserted into the interior of the cover (33) through the port (34), the bottom end of the pressure ring (12) can be pressed against the upper end of the annular brake disc (21), and the operating extension cylinder (11) can limit the annular brake disc (21) by rotating thirty degrees.
5. The anti-loosening nut according to claim 4, characterized in that: The opening (34) is located at the upper end of the cover (33), and the bottom end of the cover (33) is fixedly connected to the top end of the nut body (31).
6. The anti-loosening nut according to claim 1, characterized in that: The rubber airbag (41) is placed inside the blind hole (35). The outer diameter of the rubber airbag (41) is 0.9 times the diameter of the blind hole (35). The expansion shell (44) is inserted into the blind hole (35). The expansion shell (44) is located at the upper end of the rubber airbag (41). The outer side of the expansion shell (44) is in contact with the inner side of the blind hole (35).
7. The anti-loosening nut according to claim 1, characterized in that: The bottom end of the annular brake disc (21) is welded and fixed to the top end of the cylindrical shell (45), and the annular brake disc (21) is embedded in the inside of the cover (33).