Lock bolt with limiting assembly
By using anti-loosening bolts with limit components, and utilizing the cooperation between the cross groove of the bolt and nut and the limit sleeve, the problem of bolt loosening under high-frequency vibration in the aerospace field is solved, realizing the stability and reliability of bolt connections and ensuring the safety of aircraft.
Patent Information
- Application Number
- CN202511340696.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-19
- Publication Date
- 2025-11-04
AI Technical Summary
Existing anti-loosening technologies are insufficient in the aerospace field to effectively maintain the preload of bolt connections under high-frequency vibration environments, leading to loosening problems and affecting flight safety.
Anti-loosening bolts with limit components are used. The bolt part and the nut part have a cross groove and a limit sleeve, and the fixed buckle's claws restrict the rotation of the bolt, forming a double limit structure to prevent loosening.
In high-frequency vibration environments, ensure the stability and reliability of bolted connections, prevent loosening, and guarantee the safe operation of aircraft.
Smart Images
Figure CN120889809A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of bolt anti-loosening, in particular to an anti-loosening bolt with a limiting assembly. BACKGROUND
[0002] In aerospace equipment, bolt connection is the main assembly method of key structural parts, and its anti-loosening reliability is directly related to flight safety. The multi-dimensional vibration, impact load and extreme temperature alternation that aircrafts bear under complex working conditions can easily lead to the attenuation of pre-tightening force or even the loosening failure of traditional threaded connections. This loosening of fasteners caused by vibration not only causes the degradation of structural connection stiffness, but also can cause catastrophic accidents such as air tightness failure and component shedding.
[0003] Although there are some anti-loosening technologies at present, such as double nuts and chemical glue fixation. Double nut anti-loosening is to increase a nut to cooperate with the main nut, and use the friction between the two nuts to prevent the main nut from loosening. However, in a continuous low-frequency vibration environment, the friction between the double nuts will gradually decrease, and it is difficult to continuously and effectively maintain the pre-tightening force. Moreover, the installation of double nuts will increase the weight and volume of the connection structure, which is a disadvantage that cannot be ignored in the aerospace field which has extremely strict requirements on weight and space. Chemical glue fixation anti-loosening is to use chemical glue to fix the bolt and nut together to form a firm connection. The use of chemical glue may be affected by environmental factors such as temperature and humidity, and its performance will be unstable in extreme environments, making it difficult to balance the contradiction between high bearing demand and long-term anti-loosening performance.
[0004] In summary, the existing anti-loosening technologies have many shortcomings in the complex working conditions of the aerospace field, and there is an urgent need for a new anti-loosening connection technology to meet the actual needs. SUMMARY
[0005] The purpose of the present application is to provide an anti-loosening bolt with a limiting assembly to solve the loosening problem of bolt connection in high-frequency vibration environment in the aerospace field. The anti-loosening bolt can maintain good pre-tightening force under complex working conditions, ensuring the reliability of the connection and providing protection for the safe operation of the aircraft. Thus, the technical problems in the background art are solved.
[0006] To achieve the above-mentioned purpose, the present application provides the following technical solution: an anti-loosening bolt with a limiting assembly, comprising a bolt part, a nut part and a limiting assembly; the bolt part and the nut part are threadedly connected, and one end of the bolt part is provided with a cross recess; the limiting assembly is connected with the cross recess of the bolt part and the nut part respectively, limiting the rotation of the bolt part to prevent the bolt from loosening.
[0007] Further, the bolt part comprises an end portion, a round rod portion and a tail portion; the end portion is provided with a cross recess for cooperating with the limiting assembly to limit rotation of the screw rod, and the round rod portion is provided with a thread; and the tail portion is a hexagonal socket cap.
[0008] Further, the nut part comprises a nut body and a limiting sleeve in an integral structure; the nut body is a hexagonal nut structure in a regular hexagonal prism shape; and the limiting sleeve is coaxially arranged on one side of the nut body and is in a circular tube structure, and a plurality of openings for cooperating with the limiting assembly are symmetrically distributed in the circumferential direction of the side wall of the limiting sleeve, and the openings are paired, and the connecting line of each pair of openings passes through the axis.
[0009] Further, the limiting assembly is a fixed buckle, which is annular as a whole, has a wavy edge, and has two handles extending from one end; the fixed buckle comprises a main annular portion and a handle portion, the main annular portion is hollow in the middle and symmetrically provided with two clamping jaws, the clamping jaws extend into the openings of the limiting sleeve and are clamped into the cross recess of the end portion of the bolt part to limit the rotational freedom of the bolt part.
[0010] Further, the disassembling device is also provided, which is in a sleeve shape as a whole, has a hexagonal profile on the inner wall, is matched with the hexagonal shape of the nut body, and has a wedge-shaped protrusion arranged on one inner wall in the axial direction.
[0011] Further, the thread of the round rod portion of the bolt part is screwed and connected with the internal thread of the nut body of the nut part.
[0012] Further, after the clamping jaws of the fixed buckle pass through the openings on the limiting sleeve of the nut part, the clamping jaws are clamped into the cross recess of the end portion of the bolt part.
[0013] Beneficial effects The limiting sleeve of the anti-loose bolt nut part is used in cooperation with the fixed buckle, the clamping jaws of the fixed buckle are respectively embedded into the cross recess of the end portion of the screw rod and the openings of the limiting sleeve, and a limiting structure is formed. This limiting structure makes the nut unable to rotate around the screw rod when vibrating, limits the loosening tendency of the screw rod, and guarantees the reliability of the bolt connection.
[0014] The tail portion of the bolt part of the anti-loose bolt is provided with a hexagonal socket cap, which can be operated by using a hexagonal wrench, and is convenient for applying torque to realize tightening or loosening action. The hexagonal nut shape of the nut part is convenient for wrench operation. The handle structure of the fixed buckle cooperates with the wedge-shaped protrusion of the disassembling device, so that the installation and disassembly process of the fixed buckle is simple and efficient, and the installation and disassembly work of the bolt can be quickly completed. BRIEF DESCRIPTION OF DRAWINGS
[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.
[0016] Figure 1 This is an exploded view of the anti-loosening snail disclosed in this invention; Figure 2 This is a schematic diagram of the bolt portion of the anti-loosening screw disclosed in this invention; Figure 3 This is a schematic diagram of the fixing buckle of the anti-loosening screw disclosed in this invention; Figure 4 This is a schematic diagram of the anti-loosening screw disassembly device disclosed in this invention; Figure 5 This is a general schematic diagram of the anti-loosening screw disclosed in this invention; Figure 6 This is a schematic diagram of the bolt portion, nut portion, and fixing buckle of the anti-loosening screw disclosed in this invention.
[0017] In the picture: 1. Bolt part, 101. End, 102. Round rod part, 103. Tail part, 104. Cross groove, 2. Nut part, 201. Nut body, 202. Limiting sleeve, 203. Opening, 3. Fixing buckle, 301. Main ring part, 302. Handle part, 303. Claw, 4. Disassembly tool, 401. Wedge-shaped protrusion. Detailed Implementation
[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0019] To achieve the above objectives, the present invention provides the following technical solutions, such as... Figures 1-6 As shown, an anti-loosening bolt with a limiting component includes a bolt part 1, a nut part 2, and a limiting component; the bolt part 1 and the nut part 2 are threadedly connected, and one end of the bolt part 1 is provided with a cross groove 104; the limiting component is connected to the cross groove 104 of the nut part 2 and the bolt part 1 respectively, restricting the rotation of the bolt part 1 and preventing the bolt from loosening.
[0020] Further, the bolt part 1 comprises an end part 101, a round rod part 102 and a tail part 103; the end part 101 is provided with a cross recess 104 for cooperating with the limiting assembly to limit the rotation of the screw rod; the round rod part 102 is provided with a thread for connecting with the nut part 2 to realize the preliminary fastening with the connected member; the tail part 103 is a hexagonal socket cap nut, facilitating the operation of the hexagonal wrench to transmit large torque, and the countersunk design can reduce airflow interference.
[0021] Further, the nut part 2 comprises a nut body 201 and a limiting sleeve 202 in an integrated structure; the nut body 201 is a hexagonal nut structure in the shape of a regular hexagonal prism, facilitating the rotation operation by using a wrench; the limiting sleeve 202 is coaxially arranged on one side of the nut body 201 and has a circular tube structure, a plurality of openings 203 are symmetrically distributed in the circumferential direction of the side wall thereof, the openings 203 are in pairs, and the connecting line of the centers of each pair of openings 203 passes through the axis of the limiting sleeve 202. For cooperating with the limiting assembly to limit the rotation of the nut relative to the screw rod.
[0022] Further, the limiting assembly is a fixed buckle 3, which is annular as a whole and has a wavy structure on the outer edge, and two handles extend from one end; the fixed buckle 3 comprises a main annular part 301 and a handle part 302, the main annular part 301 is hollow in the middle and symmetrically provided with two clamping jaws 303 for being sleeved on the limiting sleeve 202 of the nut part 2, the clamping jaws 303 extend into the openings 203 of the limiting sleeve 202 and are clamped into the cross recess 104 of the end part 101 of the bolt part 1 to limit the rotation freedom of the bolt part 1; the wavy structure on the right side of the main annular part 301 is used to increase the elasticity to make the clamping more stable; the two handle parts 302 are provided with arc-shaped notches on the adjacent sides to facilitate the operation of installing by using a clamping spring pliers.
[0023] Further, it further comprises a disassembler 4 for disassembling the limiting assembly, the disassembler 4 is in the shape of a sleeve as a whole and has a hexagonal profile on the inner wall, which is matched with the hexagonal shape of the nut body 201; a wedge-shaped protrusion 401 is arranged on one of the inner walls of the disassembler 4 along the axial direction of the disassembler 4, when the limiting assembly is disassembled, the disassembler 4 is simultaneously sleeved on the limiting sleeve 202 and the fixed buckle 3; the tip of the wedge-shaped protrusion 401 on the disassembler 4 is aligned with the gap between the two handle parts 302 of the fixed buckle 3; the disassembler 4 is pressed downward, and the wedge-shaped protrusion 401 is squeezed between the two handle parts 302; the limiting assembly is expanded by using the inclined plane principle to make the clamping jaws 303 of the limiting assembly open, and finally the limiting assembly is pulled out of the cross recess 104 and disassembled.
[0024] Further, the thread of the round rod part 102 of the bolt part 1 is screw-connected with the internal thread of the nut body 201 of the nut part 2.
[0025] Further, the clamping jaws 303 of the fixed buckle 3 pass through the openings 203 on the limiting sleeve 202 of the nut part 2 and are clamped in the cross recess 104 of the end part 101 of the bolt part 1.
[0026] Working principle: In use, the nut body 201 is connected with the bolt part 1 through threads, and the nut body 201 and the tail part 103 of the bolt part 1 are connected with the parts that need to be fastened by the anti-loose bolt; the pre-tightening force is applied to the anti-loose bolt. The two clamping claws 303 of the fixed buckle 3 are clamped in the cross groove 104 of the screw end 101 and the opening 203 of the nut limiting sleeve 202 respectively, forming a stable limiting structure. Even if the nut has a tendency to rotate around the screw, the fixed buckle 3 will prevent such rotation because the clamping claws 303 are clamped in the cross groove 104 and the opening 203 of the limiting sleeve 202, limiting the rotational freedom of the nut part 2, thereby limiting loosening and ensuring that the bolt connection remains stable in a high-frequency vibration environment.
[0027] When installing the anti-loose bolt with the limiting assembly, first, the bolt part 1 is inserted through the mounting hole of the connected part, the bolt part 1 is installed on the nut part 2, the preliminary thread connection is completed, and a certain pre-tightening force is achieved. Then, the fixed buckle 3 is expanded by the wedge-shaped protrusion 401 on the dismounting device 4 or a tool such as a clamp spring pliers, at which time the two clamping claws 303 of the fixed buckle 3 are in an open state. Next, the open fixed buckle 3 is sleeved on the limiting sleeve 202 of the nut part 2 and inserted into the opening 203, and the clamping claws 303 are embedded into the cross groove 104 through the opening 203. After the top end of the clamping claw 303 is embedded into the cross groove 104, the dismounting device 4 is pulled out or the clamp spring pliers is loosened to release the fixed buckle 3, and the elastic structure of the fixed buckle 3 will automatically restore part of the deformation, tightly clamping the nut part 2 and the bolt part 1, realizing the limitation of the rotation of the nut part 2, and completing the entire installation process. In this way, in a high-frequency vibration environment, the nut part 2 is subjected to the double limitation of the thread connection of the bolt part 1 and the circumferential limitation of the fixed buckle 3, and cannot rotate, thereby ensuring the stability of the bolt connection.
[0028] When the bolt needs to be dismounted, the dismounting device 4 is sleeved on the fixed buckle 3, and the wedge-shaped protrusion 401 of the dismounting device 4 is in contact with the fixed buckle 3. With the further insertion of the dismounting device 4, the wedge-shaped protrusion 401 generates an outward expansion force by using the inclined plane principle, so that the fixed buckle 3 is opened again. When the fixed buckle 3 is opened to a certain extent, the clamping relationship between the clamping claw 303 and the cross groove 104 of the bolt part 1 and the opening 203 of the limiting sleeve 202 of the nut part 2 is released, at which time the fixed buckle 3 can be removed. After the fixed buckle 3 is removed, the nut part 2 can be easily removed, and the dismounting operation of the bolt is completed.
[0029] The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and to design various embodiments with various modifications suitable for a particular purpose.
Claims
1. A locking bolt with a limiting component, characterized in that, It includes a bolt part (1), a nut part (2) and a limiting component; the bolt part (1) and the nut part (2) are threadedly connected, and one end of the bolt part (1) is provided with a cross groove (104); the limiting component is connected to the cross groove (104) of the nut part (2) and the bolt part (1) respectively, limiting the rotation of the bolt part (1) to prevent the bolt from loosening.
2. The anti-loosening bolt with a limiting component according to claim 1, characterized in that: The bolt part (1) includes an end (101), a round rod part (102) and a tail (103); the end (101) is provided with a cross groove (104) for cooperating with the limiting component to limit the rotation of the screw, the round rod part (102) is provided with threads; the tail (103) is an internal hexagon countersunk nut.
3. The anti-loosening bolt with a limiting component according to claim 1, characterized in that: The nut part (2) includes an integral nut body (201) and a limiting sleeve (202); the nut body (201) is a hexagonal nut structure, in the shape of a regular hexagonal prism; the limiting sleeve (202) is coaxially disposed on one side of the nut body (201), the limiting sleeve (202) is a cylindrical structure, and its side wall has a plurality of openings (203) symmetrically distributed in the circumferential direction to cooperate with the limiting component. The openings (203) are paired, and the line connecting the centers of each pair of openings (203) passes through the axis of the limiting sleeve (202).
4. The anti-loosening bolt with a limiting component according to claim 1, characterized in that: The limiting component is a fixing buckle (3), which includes a main ring part (301) and a handle part; The fixing buckle (3) is ring-shaped with wavy undulations on the outer edge; two handles extend from one end of the fixing buckle (3); (302), the main ring part (301) is hollow in the middle and has two claws (303) symmetrically arranged. The claws (303) extend into the opening (203) of the limiting sleeve (202) and are inserted into the cross groove (104) of the end (101) of the bolt part (1) to restrict the rotational freedom of the bolt part (1).
5. The anti-loosening bolt with a limiting component according to claim 3, characterized in that: It also includes a disassembly device (4), which is generally sleeve-shaped with a hexagonal inner wall that matches the hexagonal shape of the nut body (201). A wedge-shaped protrusion (401) is provided along the axial direction on one inner wall of the disassembly device (4).
6. The anti-loosening bolt with a limiting component according to claim 3, characterized in that: The threaded part of the bolt portion (1) (102) is screwed into the internal thread of the nut body (201) of the nut portion (2).
7. The anti-loosening bolt with a limiting component according to claim 4, characterized in that: After the claw (303) of the fixed buckle (3) passes through the opening (203) on the limiting sleeve (202), it is engaged in the cross groove (104) at the end (101) of the bolt part (1).