Thread type anti-loosening system

Abstract

The invention discloses a thread type anti-loosening system which is composed of a bolt, a first nut and a second nut. The bolt is a T-shaped threaded bolt, two sections of threads are arranged on the screw rod, the diameter of the screw rod in the second threaded area is smaller than that of the screw rod in the first threaded area, and the lead angle of the second threaded area is smaller than that of the first threaded area; the first nut is provided with a first thread matched with the first thread area; the second nut is provided with two sections of inner holes with different diameters, one section of large-diameter inner hole is of a smooth-wall through hole structure, the diameter of the large-diameter inner hole is larger than that of the first thread, the other section of small-diameter inner hole is of an internal thread structure, the internal thread is matched with the second thread, and nut face teeth are arranged on the outer end face of the second nut. According to the anti-loosening system, the lead angle of the first thread area is larger than that of the second thread area, and the first nut applies lift force to the second nut during rotation, so that face teeth which are pressed mutually are further combined and fixed to prevent the connecting structure from loosening; the anti-loosening structure is excellent in anti-loosening performance, convenient to mount and simple in process, and a connecting base material is not damaged during mounting.

Description

Technical Field

[0001] The present invention belongs to the technical field of connection and fastening, in particular to the technical field of design and production of threaded connection components, and specifically relates to a threaded anti-loosening system. Background Art

[0002] Bolted connection structure is a mechanical connection method that connects two or more components with bolts. This connection method can be used repeatedly during installation and disassembly. Its basic principle is to generate connecting force through the tensile or compressive deformation of the bolts.

[0003] When bolt connections are used, the friction between the spiral pairs may decrease or disappear instantly under the impact, vibration or variable load of the connected parts or structures. After repeated occurrences, the connection will become loose. When the bolt connection becomes loose, the connected parts or structures will fail, causing damage to the machine or even personal accidents. Therefore, anti-loosening is very important in bolt connections.

[0004] At present, the methods commonly used to prevent fasteners from loosening in the prior art include adding anti-loosening washers, spring washers, nut anti-loosening liquid, double nut anti-loosening, nut drilling and pinning, self-locking nuts, etc. The fundamental problem of anti-loosening of threaded connections is to prevent the relative rotation of the spiral pair. At present, the threaded anti-loosening system usually adds an anti-loosening structure to the nut, such as an all-metal self-locking nut, etc. This anti-loosening method is a friction type anti-loosening method, which has insufficient anti-loosening effect. At the same time, the anti-loosening effect of each batch of products is unstable, and the product process requirements are high. At the same time, the friction type anti-loosening is also difficult to install and disassemble. There are two ways to prevent double nuts from loosening. One is to connect thick and thin double nuts at the same time. The anti-loosening effect of this structure is not ideal; the other is to add a related structure between the double nuts to prevent the double nuts from loosening. The anti-loosening device has messy parts, cumbersome installation, low construction efficiency, and difficult product processing. The existing double-stacked self-locking anti-loosening washers with good anti-loosening performance need to be embedded in the substrate surface when used, which damages the substrate. Using them in key parts such as rail vehicle bogies will cause driving safety. Summary of the invention

[0005] The present invention discloses a thread type anti-loosening system in view of the deficiencies of the prior art. The purpose of the present invention is to provide a fastening connection system with excellent anti-loosening performance, convenient installation, simple process and high construction efficiency; the thread type anti-loosening system of the present invention has a stable and excellent anti-loosening effect and does not damage the connection substrate during installation.

[0006] The present invention is achieved through the following technical solutions:

[0007] A thread type anti-loosening system, characterized by: comprising a bolt, a first nut and a second nut;

[0008] The bolt is a T-thread bolt, and two sections of threads are arranged on the screw, the first thread zone is arranged from the rear side of the bolt cap to the surface of the screw in the second thread zone, and the second thread zone is arranged from the end of the first thread zone to the end of the screw, the screw diameter of the second thread zone is smaller than the screw diameter of the first thread zone, and the thread lead angle of the second thread zone is smaller than the thread lead angle of the first thread zone;

[0009] a first nut having a first thread that cooperates with the first threaded region;

[0010] The second nut has two sections of inner holes with different diameters, wherein one section of the inner hole with a large diameter is a smooth-walled through hole structure and has a diameter larger than the diameter of the first thread, and the other section of the inner hole with a small diameter is an internal thread structure, and the internal thread cooperates with the second thread. The second nut is provided with nut face teeth with a burr structure at least on the outer end face of the large diameter end.

[0011] Furthermore, the axial length of the smooth-walled through hole of the large-diameter inner hole of the second nut is smaller than the axial length of the second threaded zone of the screw.

[0012] Further, the outer wall structure of the second nut is a hexagonal nut structure. Or, the outer wall structure of the second nut is a cylindrical structure with a large diameter section and a hexagonal nut structure with a small diameter section.

[0013] Furthermore, the nut face teeth are protrusions arranged along the longitudinal direction of the nut end face.

[0014] Furthermore, the hardness of the second nut is ≥ 400 HV.

[0015] The thread type anti-loosening system of the present invention adopts an anti-loosening system connected by a double-threaded bolt with a double nut. Different threads are arranged on the first threaded area and the second threaded area on the bolt, and the thread nominal diameter of the second threaded area is smaller than that of the first threaded area. At the same time, the second thread lead angle of the second threaded area is smaller than the first thread lead angle of the first threaded area. The first nut with a first nut structure is used for connection in the first threaded area, and the second threaded area is connected by a second nut with a nut face tooth with an anti-loosening tooth structure on the end face, and the anti-loosening teeth of the nut connected in the second threaded area are embedded in the nut surface of the first nut for combination and fixation.

[0016] In the present invention, the threaded anti-loosening system is in a vibration condition, and the second nut and the first nut are integrated, and only the first nut is allowed to rotate. When the first thread tends to loosen, due to the different lift angles in the first and second thread areas of the bolt, when rotating at the same angle, the first nut will give the second nut a lift, effectively preventing the connection system from loosening.

[0017] The benefits of the thread-type anti-loosening system of the present invention are as follows:

[0018] The bolt threads of the anti-loosening system of the present invention all adopt existing standard threads. When used, before the second nut is installed, all operation contents are consistent with the common thread connection process, and the installation is quick. The threads of the first thread zone and the second thread zone of the bolt in the system adopt standard threads with different nominal diameters, and at the same time meet the requirement that the thread lead angle of the first thread zone is greater than the thread lead angle of the second thread zone, cleverly combining the anti-loosening structure and the standard thread. The hardness of the second nut in the system is greater than the hardness of the first nut of grade 12, which effectively ensures that the small teeth on the end face of the second nut are embedded in the first nut of the common grade when installed. The system adopts a double-threaded bolt with a double-nut structure, does not add any redundant structure, and effectively reduces the types of materials under operation. The system will not cause damage to the connecting substrate surface.

[0019] The anti-loosening system of the present invention can effectively prevent the connection system from loosening. The lead angle of the first threaded area is greater than the lead angle of the second threaded area. When rotating at the same angle, the first nut gives the second nut a lift, so that the face teeth that are pressed against each other are further combined and fixed to prevent the connection structure from loosening. When a different second nut shape is used, it can be easily distinguished from the first nut, which can effectively prevent misuse. The present invention does not affect the installation and function of existing ordinary fasteners. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the thread type anti-loosening system of the present invention;

[0021] Figure 2 It is a schematic diagram of the screw structure of the threaded anti-loosening system of the present invention;

[0022] Figure 3 This is a schematic diagram of the first nut structure of the threaded anti-loosening system of the present invention;

[0023] Figure 4 It is a schematic diagram of the cross-sectional structure of the second nut of the thread type anti-loosening system of the present invention;

[0024] Figure 5 It is a schematic diagram of the end face structure of the second nut of the thread type anti-loosening system of the present invention;

[0025] Figure 6 It is a schematic diagram of the cross-sectional structure of the threaded anti-loosening system of the present invention in the connection state.

[0026] In the figure, 1 is a bolt, 2 is a first nut, 21 is a first thread, 3 is a second nut, 31 is a nut face tooth, 32 is a through hole, 33 is a second thread, 4 is a workpiece, A is a first thread zone, B is a second thread zone, α is a first thread lead angle, and β is a second thread lead angle. DETAILED DESCRIPTION

[0027] The present invention is further described below in conjunction with specific implementation methods. The specific implementation methods are further descriptions of the principles of the present invention and do not limit the present invention in any way. Technologies that are the same or similar to the present invention do not exceed the scope of protection of the present invention.

[0028] Combined with the attached pictures.

[0029] As shown in the figure, the threaded connection anti-loosening system of this embodiment is composed of three components, a bolt 1 with double threads, a first nut 2, and a second nut 3.

[0030] The thread of the double-threaded bolt 1 consists of two areas. The thread of the first thread area A is a standard thread, and the thread of the second thread area B is a small-size standard fine thread. Among them, the first thread lead angle α of the thread of the first thread area A is greater than the second thread lead angle β of the thread of the second thread area B. The threads of the first thread area A and the second thread area B are matched with the first nut 2 and the second nut 3 respectively, and the relevant performance of the bolt is consistent with the national standard.

[0031] The first nut 2 is a nut that complies with relevant national standards and needs to match the thread of the first threaded area A of the bolt.

[0032] The second nut 3 consists of two areas, a threaded end and a through-hole end. The threaded end needs to match the thread of the second threaded area B of the bolt, and the inner diameter of the through-hole end needs to be larger than the major diameter of the thread of the first threaded area A of the bolt. The purpose of the through-hole is to ensure that two threads are exposed after the first nut 2 and the bolt 1 are installed. Therefore, the length of the through-hole needs to be larger than the length of the thread exposed after the first nut 2 is tightened. At the same time, the end face of the through-hole area of ​​the second nut 3 is evenly distributed with small teeth of varying numbers, and the hardness of the second nut 3 is ≥400HV to ensure that the nut face teeth 31 on the end face of the second nut 3 can be embedded in the surface of the first nut 2 during installation.

[0033] When installing the thread anti-loosening system of this embodiment, the first nut 2 is tightened on the thread of the first thread zone A and clamps the workpiece 4, and then the second nut 3 is tightened on the thread of the second thread zone B until the end nut face teeth 31 of the second nut 3 are embedded in the first nut 2. After installation, the first nut 2 and the second nut 3 will rotate when there is a tendency to loosen under vibration conditions. Due to the different lead angles, the first thread lead angle α of the first thread zone A is greater than the second thread lead angle β of the second thread zone B. When rotating at the same angle, the first nut 2 of the first thread zone A will give a lift to the second nut 3 of the second thread zone B, effectively preventing the connection system from loosening.

Claims

1. A threaded anti-loosening system, characterized in that: It consists of a bolt, a first nut and a second nut; The bolt is a T-thread bolt, and two sections of threads are arranged on the screw, the first thread zone is arranged from the rear side of the bolt cap to the surface of the screw in the second thread zone, and the second thread zone is arranged from the end of the first thread zone to the end of the screw, the screw diameter of the second thread zone is smaller than the screw diameter of the first thread zone, and the thread lead angle of the second thread zone is smaller than the thread lead angle of the first thread zone; a first nut having a first thread that cooperates with the first threaded region; The second nut has two sections of inner holes with different diameters, wherein one section of the inner hole with a large diameter is a smooth-walled through hole structure and has a diameter larger than the diameter of the first thread, and the other section of the inner hole with a small diameter is an internal thread structure, and the internal thread cooperates with the second thread. The second nut is provided with nut face teeth with a burr structure at least on the outer end face of the large diameter end.

2. The thread-type anti-loosening system according to claim 1, characterized in that: The axial length of the large-diameter inner hole of the second nut with a smooth wall is smaller than the axial length of the second threaded zone of the screw.

3. The thread-type anti-loosening system according to claim 2, characterized in that: The outer wall structure of the second nut is a hexagonal nut structure.

4. The thread-type anti-loosening system according to claim 2, characterized in that: The outer wall structure of the second nut is a cylindrical structure in the large diameter section and a hexagonal nut structure in the small diameter section.

5. The thread-type anti-loosening system according to claim 2, characterized in that: The nut face teeth are protrusions arranged along the longitudinal direction of the nut end face.

6. The thread-type anti-loosening system according to claim 2, characterized in that: The hardness of the second nut is ≥400 HV.

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