A locking bolt

Abstract

The application belongs to the field of fasteners, and particularly discloses a locking bolt, which comprises a bolt body provided with a first external thread, the first external thread of the bolt body being used for being threadedly matched with an external internal threaded hole; and an elastic connecting piece provided with a second external thread, the elastic connecting piece being connected with the bolt body, the second external thread and the first external thread constituting a continuous thread which is used for being threadedly connected with the external internal threaded hole, and the pitch of the second external thread being smaller than the pitch of the first external thread when the elastic connecting piece is not subjected to external force. The bolt has good locking performance.

Description

Technical Field

[0001] This application belongs to the field of fastener technology, and more specifically, relates to an anti-loosening bolt. Background Technology

[0002] Bolts are fasteners commonly used to secure the connection of items. They are widely used in various machinery, equipment, vehicles, ships, railways, bridges, buildings, structures, tools, instruments, chemicals, meters, and supplies.

[0003] In related technologies, after a bolt is connected to a workpiece, the stress on the bolt is mainly concentrated in the first few turns of the thread during contact, while the stress in the later turns is significantly lower, contributing little to the tightening effect. This is especially true when the connecting hole in the workpiece is a blind hole, where the bolt's fixation relies solely on the friction of the thread contact surface (i.e., the surface of the teeth). Under the influence of factors such as vibration in the usage environment, bolts are prone to loosening after long-term use, making it difficult to guarantee a reliable tightening effect, thus requiring urgent improvement. Summary of the Invention

[0004] In view of the shortcomings or improvement needs of the prior art, this application provides an anti-loosening bolt, which aims to solve the problem of traditional bolts being easy to loosen.

[0005] This application provides an anti-loosening bolt, specifically comprising:

[0006] A bolt body having a first external thread, the first external thread of the bolt body being adapted to the thread of an external internal threaded hole;

[0007] A resilient connector having a second external thread, the resilient connector being connected to the bolt body, the second external thread forming a continuous thread with a first external thread, the continuous thread being used for threaded connection with an externally threaded hole, and...

[0008] When the elastic connector is not subjected to external force, the pitch of the second external thread is less than the pitch of the first external thread.

[0009] Compared with existing technologies, the technical solution conceived in this application, with its thread pitch smaller than that of the bolt body under normal conditions, ensures a tighter thread connection when the elastic connector is not subjected to external force. When the anti-loosening bolt is screwed into the internal threaded hole, the second external thread of the elastic connector helically engages and embeds itself in the internal threaded hole. Through physical contact between the internal threaded hole and the elastic connector, the internal threaded hole drives the thread pitch of the elastic connector to increase. This increase puts the elastic connector in a stretched state, increasing the contact area and friction between the anti-loosening bolt and the internal threaded hole, achieving a self-locking effect and effectively preventing loosening under vibration or external force. Furthermore, when the internal thread forces the elastic connector into a stretched state, the elastic connector generates a certain inward pressure, which further tightens the connection, thereby improving the stability of the anti-loosening bolt connection.

[0010] In addition, during long-term use, the elastic properties of the anti-loosening bolts ensure that the connection between the anti-loosening bolts and the internal threaded holes remains tight. The elastic deformation and recovery process of the anti-loosening bolts can prevent loosening caused by external factors such as thermal expansion and contraction.

[0011] As a further preferred embodiment, the elastic connector is made of a reversible elastic deformation material.

[0012] As a further preferred embodiment, the elastic connector (2) is a solid screw or a spirally extending elastic helical segment made of elastic material.

[0013] As a further preferred embodiment, the tooth profile of the elastic connector and the bolt body is trapezoidal, triangular, rectangular, or serrated.

[0014] As a further preferred embodiment, the root length of the tooth profile of the elastic connector is greater than the root length of the tooth profile of the bolt body.

[0015] As a further preferred embodiment, the pitch of the first external thread is 1 mm, and the pitch of the second external thread is 0.7 mm to 0.9 mm.

[0016] As a further preferred embodiment, the bolt body includes a head and a shank with the first external thread, wherein the diameter of the head is larger than the diameter of the shank.

[0017] As a further preferred embodiment, the end of the head away from the rod is provided with a slotted structure.

[0018] In summary, compared with the prior art, the technical solutions conceived in this application have the following main technical advantages:

[0019] 1. This anti-loosening bolt adopts a design that combines the bolt body with an elastic connector. When the anti-loosening bolt is screwed into the internal threaded hole, the second external thread of the elastic connector will spirally engage and embed into the internal threaded hole. Under the physical contact between the internal threaded hole and the elastic connector, the internal threaded hole drives the pitch of the elastic connector to expand. This expansion puts the elastic connector in a stretched state, increasing the friction force, thereby effectively preventing the anti-loosening bolt from loosening under vibration or external force.

[0020] 2. This elastic connector is a spirally extended elastic helical segment. The elastic connector designed under this condition can make good contact with the internal thread structure of the internal thread hole and has excellent tensile deformation capacity and deformation recovery capacity. Attached Figure Description

[0021] Figure 1 This is a structural schematic diagram of an anti-loosening bolt provided in an embodiment of this application;

[0022] Figure 2 This is a cross-sectional view of an anti-loosening bolt provided in an embodiment of this application;

[0023] Figure 3 This is a schematic diagram of the connection structure between an anti-loosening bolt and a connected component provided in an embodiment of this application;

[0024] Figure 4 yes Figure 2 Enlarged view of point A in the middle;

[0025] Figure 5 This is a schematic diagram showing the dimensions of an anti-loosening bolt provided in an embodiment of this application.

[0026] In all the accompanying drawings, the same reference numerals are used to denote the same elements or structures, wherein:

[0027] 1. Bolt body; 1-1. Head; 1-2. Shaft; 1-3. Slotted structure; 2. Elastic connector; 3. First external thread; 4. Second external thread; 5. First side; 6. Top edge; 7. Second side; 10. Internal threaded hole; 20. Connected part. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0029] The following is in conjunction with the appendix Figures 1-5 This application will be described in further detail.

[0030] This application discloses an anti-loosening bolt. (Refer to...) Figures 1-5The anti-loosening bolt includes a bolt body 1 and an elastic connector 2. The bolt body 1 has a first external thread 3, which is used to mate with an external internal threaded hole 10. The elastic connector 2 has a second external thread 4, which is connected to the bolt body 1. The second external thread 4 and the first external thread 3 form a continuous thread, which is used for threaded connection with the external internal threaded hole 10. Furthermore, when the elastic connector 2 is not subjected to external force (e.g., when the elastic connector 2 is not screwed into the internal threaded hole 10 of the connected component 20), the pitch of the second external thread 4 is less than the pitch of the first external thread 3 (i.e.,...). Figure 5 (The length indicated by dimension a).

[0031] In this design, the pitch of the second external thread 4 is smaller than that of the first external thread 3. This design ensures that the threads of the elastic connector 2 are tightly interlocked when not subjected to external force. When the anti-loosening bolt is screwed into the internal threaded hole 10, the second external thread 4 of the elastic connector 2 will helically engage and embed itself in the internal thread. Under the physical contact between the internal threaded hole 10 and the elastic connector 2, the internal threaded hole 10 drives the pitch of the elastic connector 2 to expand. This expansion keeps the elastic connector 2 in a relatively tight position. Figure 3 The tension shown increases the friction between the anti-loosening bolt and the internal threaded hole 10, giving the bolt a self-locking effect and effectively preventing it from loosening under vibration or external force. Furthermore, when the internal threaded hole 10 drives the elastic connector 2 into a tensioned state, the elastic connector 2 generates a certain inward pressure, which further tightens the connection, thereby improving the stability of the bolted connection.

[0032] In addition, during long-term use, the elastic properties of the anti-loosening bolt ensure that the connection between the anti-loosening bolt and the internal threaded hole 10 remains tight. Its elastic deformation and recovery process can prevent the anti-loosening bolt from loosening due to external factors such as thermal expansion and contraction.

[0033] Generally, the bolt body 1 is preferably a standard part (i.e., a standard bolt whose structure, size, etc. are standardized). The thread type of the elastic connector 2 is mainly set based on the thread type of the bolt body 1. Specifically, the surfaces of the elastic connector 2 and the bolt body 1 have basically the same direction of rotation and tooth profile. The free pitch of the elastic connector 2 (which can usually be considered as the pitch of the elastic connector 2 in its free expansion and contraction state) is slightly smaller than the pitch of the bolt body 1 (which is usually considered as the axial distance between the teeth). Of course, at the connection between the elastic connector 2 and the bolt body 1, the distance between the teeth of the elastic connector 2 and the axially adjacent teeth of the bolt body 1 should be basically equal to or slightly smaller than the distance between the teeth of the elastic connector 2 itself to ensure the continuity of the threaded connection.

[0034] This anti-loosening bolt is suitable not only for assembly in blind-hole type internal threaded holes 10, but also for assembly in through-hole type internal threaded holes 10, as long as the elastic connecting piece 2 of this anti-loosening bolt is still assembled in the internal threaded hole 10.

[0035] Furthermore, in some embodiments, the elastic connector 2 is a spirally extending elastic helical segment. This design allows the elastic connector 2 to effectively contact the internal thread structure of the internal threaded hole 10, exhibiting excellent tensile deformation and deformation recovery capabilities. In some embodiments, the elastic connector 2 is a solid screw made of elastic material.

[0036] Furthermore, in some embodiments, the elastic connector 2 and the bolt body 1 have the same thread profile in shape and size; that is, the thread outlines of the elastic connector 2 and the bolt body 1 are substantially the same. Generally, the thread profiles of the elastic connector 2 and the bolt body 1 are trapezoidal, triangular, rectangular, or sawtooth. For example, in this embodiment, the thread profiles of both the elastic connector 2 and the bolt body 1 are isosceles trapezoids. In some other embodiments, the elastic connector 2 and the bolt body 1 can adopt thread profiles of different shapes and sizes, as long as the elastic connector 2 can meet the requirements of helical assembly.

[0037] like Figure 4 As shown, in some specific embodiments, the teeth of the elastic connector 2 have a first side 5, a top side 6, and a second side 7. The first side 5, the top side 6, and the second side 7 are connected sequentially along a helical extension direction perpendicular to the thread to form a continuous surface for contacting the inner wall of the external internal threaded hole 10.

[0038] In other embodiments, the outer contour shapes of the elastic connector 2 and the bolt body 1 differ slightly. For example, the root length of the tooth profile of the elastic connector 2 is greater than the root length of the tooth profile of the bolt body 1, wherein the root length of the tooth profile is... Figure 5 The length indicated by dimension b in the middle.

[0039] In some specific embodiments, the method to achieve that the root length of the tooth profile of the elastic connector 2 is greater than the root length of the tooth profile of the bolt body 1 is as follows: the height and length of the top edge 6 of the elastic connector 2 are the same, the slope of the first side 5 of the tooth of the elastic connector 2 is less than the slope of the first side 5 of the tooth of the bolt body 1, and / or, the slope of the second side 7 of the tooth of the elastic connector 2 is less than the slope of the second side 7 of the tooth of the bolt body 1.

[0040] Under this design, since the slope of the first side 5 of the tooth in the elastic connector 2 is less than the slope of the first side 5 of the tooth in the bolt body 1, the part where the first side 5 of the elastic connector 2 is located will be larger than the part where the first side 5 of the bolt body 1 is located. After the elastic connector 2 is connected to the internal threaded hole 10, the inner wall surface of the internal threaded hole 10 will exert a greater squeezing effect on the first side 5. This squeezing effect can make the elastic connector 2 fit more tightly on the inner wall and generate greater inward pressure, thereby ensuring the tightness and stability of the threaded connection.

[0041] In addition, this force can promote the friction between the inner wall of the internal threaded hole 10 and the elastic connector 2, improve the stability and sealing of the overall connection between the anti-loosening bolt and the connected part 20, and to a certain extent, it can also form a sealing and leak-proof effect on the through-hole internal threaded hole 10.

[0042] Furthermore, in some embodiments, the elastic connector 2 is made of a reversibly elastically deformable material, such as a metal spring or a superelastic alloy.

[0043] Furthermore, such as Figure 1 and Figure 2 As shown, in some embodiments, the bolt body 1 includes a head 1-1 and a shank 1-2 with a first external thread 3, wherein the diameter of the head 1-1 is larger than the diameter of the shank 1-2. In actual use, the head 1-1 of the bolt body 1 can eventually abut against the outer surface of the connected member 20, thereby locking the anti-loosening bolt.

[0044] Furthermore, in some embodiments, a slotted structure 1-3 is provided at the end of the head 1-1 opposite to the rod portion 1-2. For example, the slotted structure 1-3 is an internal hexagonal hole, which is used to facilitate the user to tighten the bolt using a hexagonal wrench.

[0045] Furthermore, in some embodiments, when processing this anti-loosening bolt, the anti-loosening bolt can be formed by connecting a separately processed elastic structure with a regular bolt. In actual use, the method of using this anti-loosening bolt is basically the same as that of ordinary bolts currently on the market.

[0046] Example:

[0047] The bolt body 1 of this anti-loosening bolt is an M6 bolt, where parameter M indicates a metric thread, meaning that the bolt thread specification is manufactured according to the metric standard (ISO); parameter 6 indicates that the bolt diameter is 6 mm, and the preferred pitch of the bolt body 1 is 1 mm.

[0048] The elastic connector 2 is an elastic helical segment with 3-7 helical turns and a free pitch of 0.7 mm-0.9 mm. Preferably, the number of helical turns is 5, and the free pitch (the pitch when not subjected to external force) is 0.8 mm.

[0049] It should be understood that expressions such as "comprising" and "may include" as used in this application indicate the existence of the disclosed functions, operations, or constituent elements, and do not limit one or more additional functions, operations, and constituent elements. In this application, terms such as "comprising" and / or "having" may be interpreted as indicating a specific characteristic, number, operation, constituent element, component, or combination thereof, but should not be interpreted as excluding the existence or possibility of adding one or more other characteristics, numbers, operations, constituent elements, components, or combinations thereof.

[0050] It should be understood that the terms “center,” “upper,” “lower,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “inner,” “outer,” “clockwise,” “counterclockwise,” “axial,” “radial,” and “circumferential” indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0051] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0052] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0053] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A check bolt, characterized in that, The utility model relates to a bolt body (1) with a first external thread (3) for threadedly fitting with an external internal threaded hole (10), an elastic connecting piece (2) with a second external thread (4) connected with the bolt body (1), the elastic connecting piece (2) having a tooth profile root length greater than that of the bolt body (1), the second external thread (4) and the first external thread (3) constituting a continuous thread for threadedly connecting with the external internal threaded hole (10), and the second external thread (4) having a pitch less than that of the first external thread (3) when the elastic connecting piece (2) is not subjected to an external force. The elastic connecting piece (2) is made of reversibly elastically deformable material. The elastic connecting piece (2) is a solid screw rod made of elastic material. The elastic connecting piece (2) is an elastically spirally extending elastic spiral segment made of elastic material.

2. The check bolt of claim 1, wherein, The tooth profile of the elastic connecting piece (2) and the bolt body (1) is trapezoidal, triangular, rectangular or sawtooth-shaped.

3. The check bolt of claim 1 wherein, The pitch of the first external thread (3) is 1 mm, and the pitch of the second external thread (4) is 0.7-0.9 mm.

4. The check bolt of claim 1 wherein, The bolt body (1) comprises a head (1-1) and a shank (1-2) with the first external thread (3), the head (1-1) having a diameter greater than that of the shank (1-2).

5. The check bolt of claim 1 wherein, The head (1-1) is provided with a slotted hole structure (1-3) at the end away from the shank (1-2).

6. A check bolt according to any one of claims 1-5, characterized in that ​ 7. A check bolt according to any one of claims 1 to 5 wherein, ​ 8. The check bolt of claim 7, wherein, ​

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