Anti-loosening bolt

Abstract

The utility model belongs to the technical field of fasteners, and particularly relates to an anti-loosening bolt which comprises a bolt body, a nut, a nut and a nut, the bolt body comprises a head used for applying force, a rod portion with external threads and a groove formed in the rod portion and used for limiting; the anti-loosening assembly comprises a first nut, a second nut, an anti-loosening spring located between the first nut and the second nut and a limiting piece matched with the groove body, wherein the first nut and the second nut are arranged in a spaced mode. The limiting piece is matched with the second nut and used for limiting rotation of the second nut. The anti-loosening bolt has the beneficial effects that the anti-loosening spring, the limiting piece, the first nut and the second nut in the anti-loosening assembly are matched, so that the loosening trend caused by vibration can be effectively resisted, and gaps generated by vibration can be continuously compensated through elastic deformation of the spring; for example, when the upper nut is loosened due to vibration, the rebound force of the spring can push the lower nut to abut upwards, a dynamic pressure closed loop is formed, and the nut is kept in a fastened state.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of fasteners, and particularly relates to a loosening-preventing bolt. BACKGROUND

[0002] A bolt is a commonly used fastener and is widely used in various mechanical devices. For ordinary application occasions without special strict requirements on loosening prevention characteristics, an ordinary fastening structure of one bolt plus one nut and a gasket can be used.

[0003] However, if the existing equipment or components are long-term placed in a vibrating environment, they will be subjected to greater pressure than in a normal environment, which will cause the bolt and the nut to be prone to loosening, thereby affecting the normal operation of the equipment, and even causing safety accidents. Therefore, improvement is needed. SUMMARY

[0004] The application aims to provide a loosening-preventing bolt which can solve the above problems.

[0005] The application aims to provide a loosening-preventing bolt, which comprises:

[0006] a bolt body comprising a head for force application, a rod portion with external threads, and a groove provided on the rod portion and used for limiting;

[0007] a loosening-preventing assembly comprising a first nut, a second nut, a loosening-preventing spring located between the first nut and the second nut, and a limiting piece matched with the groove;

[0008] The limiting piece is matched with the second nut and used for limiting the rotation of the second nut. The head, the rod portion, and the groove are an integral structure, and the head is used for matching with a tightening tool such as a wrench to facilitate force application. The loosening-preventing spring located between the first nut and the second nut is sleeved outside the rod portion, the helical direction of the loosening-preventing spring is opposite to the thread direction of the rod portion, the second nut is tightened with the first nut and compresses the loosening-preventing spring.

[0009] Further, the groove comprises:

[0010] a vertical portion;

[0011] an arc-shaped portion;

[0012] The vertical portion extends from one end of the rod portion away from the head to the head direction, the arc-shaped portion extends outward, and the vertical portion and the arc-shaped portion penetrate the entire external thread.

[0013] Further, the limiting piece comprises:

[0014] a wrapping shell matched with the second nut and capable of being sleeved outside the second nut, and a through hole is provided in the center of the wrapping shell for the rod portion to pass through;

[0015] The limiting rod is arranged on the wrapping shell and cooperates with the groove body.

[0016] The limiting rod can be clamped into the groove body and contact the inner wall of the groove body and the inner thread of the second nut.

[0017] Further, the limiting rod is in a wave shape and can be bent and can maintain the bent shape. The wave-shaped surface can form multiple-point contact with the inner wall of the groove body. The material of the limiting rod is a deformable metal material, which can maintain the bent shape after bending and has a certain elasticity, and can be tightly attached to the groove body through elastic recovery.

[0018] Further, the edge of the through hole is provided with a sawtooth structure composed of a plurality of elastic sawteeth arranged in an array. The elastic sawteeth cooperate with the thread of the rod portion to form a locking structure. When the bolt is subjected to vibration or external force, the elastic sawteeth can be embedded in the gap of the thread.

[0019] Further, the first nut is provided with a first locking groove at the end in contact with the lock spring, and the first locking groove is used to lock the lock spring and limit its rotation.

[0020] Further, the second nut is provided with a second locking groove at the end in contact with the lock spring, and the second locking groove is used to lock the lock spring and limit its rotation.

[0021] The beneficial effects of the present application are:

[0022] 1. The anti-loose bolt of the present application can effectively resist the loosening trend caused by vibration by cooperating the lock spring, the limiting piece, the first nut and the second nut in the anti-loose assembly. The elastic deformation of the spring can continuously compensate for the gap caused by vibration. For example, when vibration causes the upper nut to loosen, the rebound force of the spring will push the lower nut upward to form a dynamic pressure closed loop, so that the nut remains in a fastened state.

[0023] 2. The limiting rod is arranged on the wrapping shell and cooperates with the groove body. It can be clamped into the groove body and contact the inner wall of the groove body and the inner thread of the second nut, so that the limiting rod plays an accurate limiting role in the groove body and limits the rotation range of the second nut. When the bolt is subjected to vibration, the contact between the limiting rod and the inner wall of the groove body can prevent the second nut from rotating circumferentially, further enhancing the anti-loose effect.

[0024] 3. When the bolt is subjected to dynamic load, the lock spring may have a slight tendency to move. The existence of the second locking groove and the first locking groove can effectively inhibit this movement, so that the lock spring is always tightly attached between the second nut and the first nut, ensuring the overall stability of the anti-loose structure and improving the anti-loose effect. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a structural schematic view of the utility model;

[0026] Figure 2 is a structural schematic view of another perspective of the utility model;

[0027] Figure 3 is a sectional view of the utility model;

[0028] Figure 4 is a disassembled schematic view of the utility model.

[0029] In the drawing, reference signs are: 100, bolt body; 110, head; 120, shank; 130, groove; 131, vertical part; 132, arc part; 200, first nut; 210, first locking groove; 300, second nut; 310, second locking groove; 400, anti-loose spring; 500, limiting piece; 510, wrapping shell; 511, through hole; 520, limiting rod; 530, elastic sawtooth. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present application.

[0031] The terms "first", "second", and the like in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are usually a class, not limited to the number of objects, for example, the first object can be one or more. In addition, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / ", generally indicates that the front and rear associated objects are in an "or" relationship.

[0032] The anti-loose bolt provided by the embodiments of the present application will be described in detail below in combination with the drawings and specific embodiments and application scenarios.

[0033] Embodiment 1:

[0034] As shown in Figures 1 to 4 , the embodiments of the present application provide an anti-loose bolt, comprising:

[0035] The bolt body 100 comprises a head 110 for force application, a shank 120 with external threads, and a groove 130 provided on the shank 120 and used for limiting.

[0036] The anti-loosening assembly includes a first nut 200 and a second nut 300 spaced apart, an anti-loosening spring 400 located between the first nut 200 and the second nut 300, and a limiting member 500 that cooperates with the groove 130.

[0037] The limiting member 500 cooperates with the second nut 300 and is used to limit the rotation of the second nut 300.

[0038] In some embodiments of this application, such as Figure 1 As shown, the aforementioned anti-loosening bolt features a head 110, a rod 120, and a groove 130 as a single unit. The head 110 is designed to work with tightening tools such as wrenches for easy application of force. An anti-loosening spring 400, located between the first nut 200 and the second nut 300, is sleeved on the outside of the rod 120, with the helix direction of the anti-loosening spring 400 opposite to the thread direction of the rod 120. The second nut 300 is tightened onto the first nut 200, compressing the anti-loosening spring 400.

[0039] In long-term vibration environments, traditional bolts and nuts are prone to loosening due to relative rotation caused by vibration. The anti-loosening bolt of this application can effectively resist the loosening tendency caused by vibration by utilizing the anti-loosening spring 400, the limiting member 500, and the cooperation of the first nut 200 and the second nut 300 in the anti-loosening component. The elastic deformation of the spring can continuously compensate for the gap caused by vibration. For example, when the upper nut loosens due to vibration, the rebound force of the spring will push the lower nut upward to tighten, forming a dynamic pressure closed loop to keep the nut in a tight state. The cooperation between the limiting member 500 and the groove 130 and the limitation of the rotation of the second nut 300 by the limiting member 500 further enhance the stability of the bolt connection and effectively reduce the possibility of bolt loosening.

[0040] Meanwhile, since the anti-loosening bolts of this application can effectively prevent loosening, they can ensure that the connection between the various parts of the equipment with the bolts of this application installed is tighter and more reliable. This helps the equipment maintain normal mechanical performance and operating accuracy in a vibration environment, reduces problems such as component displacement and wear caused by bolt loosening, and thus ensures the normal operation of the equipment and improves the reliability and service life of the equipment.

[0041] Furthermore, in applications with high safety requirements, such as industrial production equipment and transportation vehicles, loose bolts can lead to serious safety accidents. The anti-loosening bolt of this application, through its reliable anti-loosening design, reduces the risk of equipment malfunction or damage caused by loose bolts, thereby providing strong protection for personnel and property safety.

[0042] Example 2:

[0043] The anti-loose bolt provided in the embodiment of the present application comprises the following technical features in addition to the above technical features.

[0044] As shown in Figures 1 to 4 The groove body 130 comprises:

[0045] a vertical portion 131;

[0046] an arc-shaped portion 132;

[0047] The vertical portion 131 extends from the end of the shank portion 120 away from the head portion 110 to the head portion 110, the arc-shaped portion 132 extends outward, and the vertical portion 131 and the arc-shaped portion 132 pass through the entire external thread.

[0048] In the embodiment of the present application, the vertical portion 131 extends from the end of the shank portion 120 away from the head portion 110 to the head portion 110, so that the limiting piece 500 can be guided more clearly and stably when moving along the vertical portion 131, and the moving track of the limiting piece 500 on the vertical portion 131 is relatively fixed and is not prone to deviation or shaking when the bolt is subjected to vibration or external force, thereby ensuring the stability of the cooperation between the limiting piece 500 and the groove body 130. The arc-shaped portion 132 extends outward to provide additional limiting space for the limiting piece 500, further limit the movement range of the limiting piece 500, and prevent it from coming out of the groove body 130. At the same time, the design of the arc-shaped portion 132 also enables the limiting piece 500 to better adapt and remain stable when subjected to force in different directions, thereby enhancing the reliability of the entire anti-loose structure.

[0049] At the same time, the vertical portion 131 and the arc-shaped portion 132 pass through the entire external thread, so that the groove body 130 can function on the entire shank portion 120 of the bolt. In different working conditions, the force and vibration conditions to which the bolt is subjected may be different, and the groove body 130 passing through the entire external thread can ensure that effective cooperation and limiting of the limiting piece 500 are provided at any position, thereby adapting to various complex stress environments and further enhancing the anti-loose effect.

[0050] Embodiment 3

[0051] The anti-loose bolt provided in the embodiment of the present application comprises the following technical features in addition to the above technical features.

[0052] As shown in Figures 1 to 4 The limiting piece 500 comprises:

[0053] a wrapping shell 510, which cooperates with the second nut 300 and can be sleeved outside the second nut 300, and the wrapping shell 510 is provided with a through hole 511 in the center for the shank portion 120 to pass through;

[0054] The limiting rod 520 is arranged on the wrapping shell 510 and cooperates with the groove body 130.

[0055] The limiting rod 520 can be clamped into the groove body 130 and in contact with the inner wall of the groove body 130 and the inner thread of the second nut 300.

[0056] In the embodiment, the wrapping shell 510 cooperates with the second nut 300 and can be sleeved outside the second nut 300, so that the wrapping shell 510 can limit the second nut 300. The through hole 511 is arranged in the center of the wrapping shell 510 and can be passed through by the rod part 120, so that the rod part 120 can pass through smoothly and does not affect the normal installation and use of the bolt. The limiting rod 520 is arranged on the wrapping shell 510 and cooperates with the groove body 130. The limiting rod 520 can be clamped into the groove body 130 and in contact with the inner wall of the groove body 130 and the inner thread of the second nut 300, so that the limiting rod 520 can limit the rotation range of the second nut 300 in the groove body 130. When the bolt is vibrated, the contact between the limiting rod 520 and the inner wall of the groove body 130 can prevent the second nut 300 from rotating circumferentially, and further enhances the anti-loosening effect.

[0057] Meanwhile, the limiting rod 520 can be clamped into the groove body 130, so that the position stability of the limiting rod 520 in the groove body 130 is ensured, the limiting rod 520 is not easy to be taken out of the groove body 130, and the reliability of the limiting function is ensured. The structure of the limiting piece 500 is relatively simple, and the combination of the wrapping shell 510 and the limiting rod 520 is easy to install. During the installation process, the wrapping shell 510 is only needed to be sleeved outside the second nut 300, and the limiting rod 520 is only needed to be clamped into the groove body 130 in alignment, so that the operation is simple and convenient, and the installation efficiency can be improved. If the limiting piece 500 is worn or damaged during use, it can be conveniently replaced. Since the wrapping shell 510 and the limiting rod 520 are independent components, the wrapping shell 510 is only needed to be taken off from the second nut 300, and a new limiting piece 500 is only needed to be replaced, so that the entire anti-loosening bolt does not need to be disassembled, and the maintenance cost and difficulty are reduced.

[0058] Further, the limiting rod 520 is in a wave shape, and the limiting rod 520 can be bent and can maintain the bent shape.

[0059] The limiting rod 520 is wavy-shaped, which can make the limiting rod 520 have better flexibility when cooperating with the groove body 130. The wavy-shaped surface can form multi-point contact with the inner wall of the groove body 130, compared with the straight limiting rod 520, the contact area and friction are increased, thereby improving the cooperation stability between the limiting rod 520 and the groove body 130, maintaining the close cooperation with the groove body 130, and effectively preventing the second nut 300 from rotating. Meanwhile, the limiting rod 520 herein is made of a deformable metal material, which can maintain the bent shape after bending and has a certain elasticity, and can be tightly attached to the groove body 130 through rebound.

[0060] Embodiment 4:

[0061] The embodiment of the application provides a loosening-proof bolt, in addition to comprising the above technical features, the loosening-proof bolt of the embodiment of the application further comprises the following technical features.

[0062] As shown in Figures 1 to 4 The edge of the through hole 511 is provided with a sawtooth structure, and the sawtooth structure is composed of a plurality of elastic sawteeth 530 arranged in an array.

[0063] In the embodiment of the application, the sawtooth structure arranged at the edge of the through hole 511 is composed of a plurality of elastic sawteeth 530 arranged in an array, and the elastic sawteeth 530 and the threads of the rod part 120 form a locking structure. When the bolt is subjected to vibration or external force, the elastic sawteeth 530 can be embedded in the gap of the thread, thereby increasing the friction and resistance between the nut and the bolt, and effectively preventing the nut from loosening in the axial or circumferential direction. Thus, the loosening-proof performance of the loosening-proof bolt is effectively improved, and the bolt connection can be kept fastened under various harsh working conditions.

[0064] Meanwhile, the elastic sawteeth 530 have a certain elasticity and are uniformly arranged at the edge of the through hole 511, so that the locking structure can provide uniform locking force in all directions, avoiding the problems of excessive or insufficient local force, and ensuring the stability and reliability of the connection between the nut and the bolt.

[0065] Embodiment 5:

[0066] The embodiment of the application provides a loosening-proof bolt, in addition to comprising the above technical features, the loosening-proof bolt of the embodiment of the application further comprises the following technical features.

[0067] As shown in Figures 1 to 4 The first nut 200 is provided with a first locking groove 210 at one end in contact with the loosening-proof spring 400, and the first locking groove 210 is used for locking the loosening-proof spring 400 and limiting the rotation of the loosening-proof spring 400.

[0068] In the embodiment of the present application, the first nut 200 is provided with a first locking groove 210 at the end in contact with the lock spring 400, and the lock spring 400 can be embedded in the locking groove, which can effectively prevent the lock spring 400 from moving in the axial direction and ensure that the lock spring 400 is always in the correct position to provide a continuous elastic force for the nut. When the bolt is subjected to vibration or external force, the lock spring 400 will not change its working state due to axial movement, ensuring the stability of the lock effect.

[0069] At the same time, the first locking groove 210 provides accurate positioning for the lock spring 400, so that the lock spring 400 can be quickly installed to the specified position during installation, which not only improves the installation efficiency, but also avoids the problem of reduced lock performance caused by position deviation of the lock spring 400.

[0070] Further, the second nut 300 is provided with a second locking groove 310 at the end in contact with the lock spring 400, and the second locking groove 310 is used to lock the lock spring 400 and limit its rotation.

[0071] In some embodiments of the present application, the second nut 300 is provided with a second locking groove 310 at the end in contact with the lock spring 400, which works together with the first locking groove 210 to axially position the lock spring 400 from both ends, and the double positioning method further enhances the stability of the lock spring 400 in the axial direction, so that it can maintain the correct position under various working conditions, and ensure that the elastic force of the lock spring 400 is always effective on the nut, preventing the nut from moving axially due to vibration or external force.

[0072] When the bolt is subjected to dynamic load, the lock spring 400 may have a slight tendency to move, and the presence of the second locking groove 310 and the first locking groove 210 can effectively suppress this movement, so that the lock spring 400 is always tightly fitted between the second nut 300 and the first nut 200, ensuring the overall stability of the lock structure and improving the lock effect.

[0073] It should be noted that, in the present document, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises a", "comprising", or "includes a", does not, without more constraints, preclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element. Furthermore, it should be noted that the scope of the methods and apparatus of the present embodiments are not limited by the order of the steps or the order of the components, as described in the examples, but can include performing the steps in different order, or performing the steps concurrently, or in reverse order, or omitting one or more steps, or adding one or more steps, or adding, omitting, or combining various features of the examples described. Also, features described in relation to one example can be combined in other examples.

[0074] The embodiments of the present application described above are merely exemplary and are not intended to limit the present application to the above-described embodiments, but the above-described embodiments are merely illustrative, and the present application is not limited to the above-described embodiments. The embodiments of the present application described above are merely exemplary and are not intended to limit the present application to the above-described embodiments, but the above-described embodiments are merely illustrative, and the present application is not limited to the above-described embodiments.

Claims

1. A captive bolt, characterized by: The utility model relates to a bolt body (100) including a head (110) for force application, a shank (120) with external thread and a groove (130) arranged on the shank (120) for limiting, a loosening prevention assembly including a first nut (200), a second nut (300), a loosening prevention spring (400) between the first nut (200) and the second nut (300) and a limiting piece (500) cooperating with the groove (130), wherein the limiting piece (500) cooperates with the second nut (300) and is used for limiting rotation of the second nut (300). The utility model relates to a bolt body (100) including a head (110) for force application, a shank (120) with external thread and a groove (130) arranged on the shank (120) for limiting, a loosening prevention assembly including a first nut (200), a second nut (300), a loosening prevention spring (400) between the first nut (200) and the second nut (300) and a limiting piece (500) cooperating with the groove (130), wherein the limiting piece (500) cooperates with the second nut (300) and is used for limiting rotation of the second nut (300). The groove (130) includes a vertical part (131) and an arc-shaped part (132), wherein the vertical part (131) extends from an end of the shank (120) away from the head (110) to the head (110), the arc-shaped part (132) extends outwardly, and the vertical part (131) and the arc-shaped part (132) pass through the entire external thread. The limiting piece (500) includes a wrapping shell (510) cooperating with the second nut (300) and capable of being sleeved outside the second nut (300), and a limiting rod (520) arranged on the wrapping shell (510) and cooperating with the groove (130), wherein the limiting rod (520) can be clamped into the groove (130) and contact the inner wall of the groove (130) and the internal thread of the second nut (300).

2. A tamperproof bolt according to claim 1 wherein: The limiting rod (520) is wavy, and the limiting rod (520) can be bent and can maintain the bent shape. The edge of the through hole (511) is provided with a sawtooth structure composed of a plurality of elastic sawteeth (530) arranged uniformly. The first nut (200) is provided with a first locking groove (210) on the end in contact with the loosening prevention spring (400), and the first locking groove (210) is used for locking the loosening prevention spring (400) and limiting rotation of the loosening prevention spring (400). The second nut (300) is provided with a second locking groove (310) on the end in contact with the loosening prevention spring (400), and the second locking groove (310) is used for locking the loosening prevention spring (400) and limiting rotation of the loosening prevention spring (400).

3. A tamperproof bolt according to claim 2 wherein: ​ ​ ​ ​ 4. A tamperproof bolt according to claim 3 wherein: ​ 5. A tamperproof bolt according to claim 3 wherein: ​ 6. The anti-loosening bolt according to claim 1, wherein: ​ 7. The anti-loosening bolt according to claim 1, wherein: ​

Images