Lock bolt

Abstract

The invention belongs to the field of fasteners, and particularly discloses an anti-loosening bolt which comprises a bolt body provided with first external threads, and the first external threads of the bolt body are used for being matched with threads of an external internal threaded hole; the elastic connecting piece is provided with a second external thread, the elastic connecting piece is connected with the bolt body, the second external thread and the first external thread form a continuous thread, the continuous thread is used for being in threaded connection with an external internal threaded hole, and when the elastic connecting piece is not subjected to external force, the elastic connecting piece is connected with the bolt body. The pitch of the second external threads is smaller than that of the first external threads. The bolt provided by the invention has good anti-loosening performance.

Description

Technical Field

[0001] The present application belongs to the technical field of fasteners, and more specifically, relates to an anti-loosening bolt. Background Art

[0002] Bolts are a type of fastener commonly used for fastening objects. They are widely used in various machinery, equipment, vehicles, ships, railways, bridges, buildings, structures, tools, instruments, chemicals, meters and supplies.

[0003] In the related art, after the bolt is connected to the connected part, the stress of the bolt is mainly concentrated on the first few turns of the thread in contact with the connected part, and the stress in the latter part of the thread contact is significantly smaller, which has limited contribution to the tightening effect. Especially when the connecting hole of the connected part is a blind hole, the fixing of the bolt only relies on the friction force of the thread contact surface (i.e. the surface of the tooth). Under the influence of factors such as vibration in the use scenario, the bolt is prone to loosening after long-term use, and it is difficult to ensure a reliable tightening effect, which is in urgent need of improvement. Summary of the invention

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

[0005] The present application provides an anti-loosening bolt, which specifically includes: A bolt body having a first external thread, wherein the first external thread of the bolt body is adapted to threadably match the external internal threaded hole; an elastic connector having a second external thread, the elastic connector being connected to the bolt body, the second external thread and the first external thread forming a continuous thread, the continuous thread being used for threaded connection with the external internal thread hole, and When the elastic connecting member is not subjected to external force, the pitch of the second external thread is smaller than the pitch of the first external thread.

[0006] The above technical solution conceived by the present application is compared with the prior art because the pitch of the elastic connector is smaller than the pitch of the bolt body under normal conditions. This design makes the teeth of the elastic connector tighter when it 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 will be spirally engaged and embedded in 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 tensile state, increases the contact area and friction between the anti-loosening bolt and the internal threaded hole, and realizes the self-locking effect of the bolt, thereby effectively preventing the anti-loosening bolt from loosening under vibration or external force. In addition, when the internal thread forces the elastic connector to be in a tensile state, the elastic connector will form a certain inward pressure, which further locks the connection, thereby improving the stability of the anti-loosening bolt connection.

[0007] In addition, during long-term use, the elastic properties of the anti-loosening bolt can keep the connection between the anti-loosening bolt and the internal threaded hole always tight, and its elastic deformation and recovery process can prevent the anti-loosening bolt from loosening due to external factors such as thermal expansion and contraction.

[0008] As a further preference, the elastic connecting member is made of a reversible elastic deformation material.

[0009] As a further preference, the elastic connecting member (2) is a solid screw made of elastic material or a helically extending elastic spiral segment.

[0010] As a further preference, the tooth profiles of the elastic connecting member and the bolt body are trapezoidal, triangular, rectangular or sawtooth.

[0011] As a further preference, the length of the thread profile root of the elastic connecting member is greater than the length of the thread profile root of the bolt body.

[0012] As further preferred, the pitch of the first external thread is 1 mm, and the pitch of the second external thread is 0.7 mm-0.9 mm.

[0013] As further preferred, the bolt body includes a head and a shank with the first external thread, and a diameter of the head is greater than a diameter of the shank.

[0014] As a further preference, a slot structure is provided at one end of the head portion away from the rod portion.

[0015] In general, the above technical solutions conceived by this application have the following technical advantages compared with the prior art: 1. This anti-loosening bolt adopts a design that combines a 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 be spirally engaged and embedded in the internal threaded hole. Under the physical contact between the internal threaded hole and the elastic connector, the internal threaded hole drives the tooth 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.

[0016] 2. The elastic connector is an elastic spiral section extending in a spiral shape. The elastic connector with this design can well contact the internal thread structure of the internal thread hole and has excellent tensile deformation ability and deformation recovery ability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a locking bolt provided in an embodiment of the present application; Figure 2is a cross-sectional view of an anti-loosening bolt provided in an embodiment of the present application; Figure 3 This is a schematic diagram of a connection structure between a locking bolt and a connected component provided in an embodiment of the present application; Figure 4 yes Figure 2 The enlarged view of point A in the middle; Figure 5 It is a dimension marking schematic diagram of an anti-loosening bolt provided in an embodiment of the present application.

[0018] Throughout the drawings, the same reference numerals are used to denote the same elements or structures, wherein: 1. Bolt body; 1-1. Head; 1-2. Rod; 1-3. Slotted hole structure; 2. Elastic connecting member; 3. First external thread; 4. Second external thread; 5. First side; 6. Top edge; 7. Second side; 10. Internal threaded hole; 20. Connected member. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0020] The following is combined with Figure 1-Figure 5 This application is described in further detail.

[0021] The present application embodiment discloses a locking bolt. Figure 1-Figure 5 The anti-loosening bolt comprises a bolt body 1 and an elastic connector 2; wherein the bolt body 1 has a first external thread 3, and the first external thread 3 of the bolt body 1 is used to threadably adapt to the external internal thread hole 10; the elastic connector 2 has a second external thread 4, the elastic connector 2 is connected to the bolt body 1, and the second external thread 4 and the first external thread 3 form a continuous thread, and the continuous thread is used to threadably connect with the external internal thread hole 10, and when the elastic connector 2 is not subjected to external force (such as when the elastic connector 2 is not screwed into the internal thread hole 10 of the connected member 20), the pitch of the second external thread 4 is smaller than the pitch of the first external thread 3 (i.e. Figure 5 The length shown by dimension a).

[0022] In this design, since the pitch of the second external thread 4 is smaller than the pitch of the first external thread 3, this design makes the teeth of the elastic connector 2 tighter when no external force is applied. When the anti-loosening bolt is screwed into the internal thread hole 10, the second external thread 4 of the elastic connector 2 will be screwed into the internal thread. Under the physical contact between the internal thread hole 10 and the elastic connector 2, the internal thread hole 10 drives the pitch of the elastic connector 2 to expand. This expansion makes the elastic connector 2 in a state as shown in FIG. Figure 3 The tension state shown increases the friction between the anti-loosening bolt and the internal threaded hole 10, so that the bolt has a self-locking effect, which can effectively prevent the anti-loosening bolt from loosening under vibration or external force. In addition, when the internal threaded hole 10 drives the elastic connector 2 to be in a tension state, the elastic connector 2 will form a certain inward pressure, which further locks the connection, thereby improving the stability of the bolt connection.

[0023] In addition, during long-term use, the elastic properties of the anti-loosening bolt can keep the connection between the anti-loosening bolt and the internal threaded hole 10 always tight, and its elastic deformation and recovery process can prevent the anti-loosening bolt from loosening due to external factors such as thermal expansion and contraction.

[0024] Generally speaking, the bolt body 1 preferably adopts a standard part (i.e., a standard bolt whose structure, size, etc. have been standardized), and the thread form of the elastic connector 2 is mainly set according to the thread form of the bolt body 1. Among them, the surfaces of the elastic connector 2 and the bolt body 1 have basically the same rotation direction and thread type, and the free spacing of the elastic connector 2 (usually regarded as the pitch of the elastic connector 2 when it is in a free telescopic state) is slightly smaller than the pitch of the bolt body 1 (usually regarded as the axial spacing between the threads). Of course, at the connection between the elastic connector 2 and the bolt body 1, the spacing between the threads of the elastic connector 2 and the threads of the bolt body 1 adjacent in the axial direction should be basically equal to or slightly smaller than the distance between the threads of the elastic connector 2 itself, so as to ensure the continuity of the threaded connection.

[0025] The anti-loosening bolt is not only suitable for assembly in the internal threaded hole 10 in the form of a blind hole, but also suitable for assembly in the internal threaded hole 10 in the form of a through hole, as long as the elastic connecting part 2 of the anti-loosening bolt is still assembled in the internal threaded hole 10.

[0026] Further, in some embodiments, the elastic connector 2 is a spirally extending elastic spiral segment, and the elastic connector 2 under this design can well contact the internal thread structure of the internal thread hole 10, and has excellent tensile deformation ability and deformation recovery ability. In some embodiments, the elastic connector 2 is a solid screw made of elastic material.

[0027] Further, in some embodiments, the elastic connector 2 and the bolt body 1 have the same shape and size of the thread profile, that is, the elastic connector 2 and the bolt body 1 have substantially the same thread profile. Generally speaking, the thread profiles of the elastic connector 2 and the bolt body 1 are trapezoidal, triangular, rectangular or sawtooth. For example, in the present embodiment, the thread profiles of the elastic connector 2 and the bolt body 1 are both isosceles trapezoidal. In some other embodiments, the elastic connector 2 and the bolt body 1 can have thread profiles of different shapes and sizes, as long as the elastic connector 2 can meet the requirements of spiral assembly.

[0028] like Figure 4 As shown, in some specific embodiments, the teeth of the elastic connector 2 have a first side edge 5, a top edge 6 and a second side edge 7, and the first side edge 5, the top edge 6 and the second side edge 7 are connected in sequence along a spiral extension direction perpendicular to the thread to form a continuous surface for contacting the inner wall of the external internal threaded hole 10.

[0029] In other embodiments, the outer contours of the elastic connector 2 and the bolt body 1 are slightly different. For example, the root length of the thread type of the elastic connector 2 is greater than the root length of the thread type of the bolt body 1, wherein the root length of the thread type is Figure 5 The length indicated by dimension b.

[0030] In some specific embodiments, the tooth root length of the elastic connector 2 is greater than the tooth root length of the bolt body 1 in the following manner: the height and length of the top edge 6 of the elastic connector 2 are the same, the slope of the first side edge 5 of the tooth of the elastic connector 2 is smaller than the slope of the first side edge 5 of the tooth of the bolt body 1, and / or the slope of the second side edge 7 of the tooth of the elastic connector 2 is smaller than the slope of the second side edge 7 of the tooth of the bolt body 1.

[0031] Under this design, since the slope of the first side edge 5 of the tooth in the elastic connector 2 is smaller than the slope of the first side edge 5 of the tooth in the bolt body 1, the portion where the first side edge 5 in the elastic connector 2 is located will be larger than the portion where the first side edge 5 in 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 produce a greater extrusion effect on the first side edge 5, and this extrusion effect can make the elastic connector 2 fit more closely to the inner wall and generate greater inward pressure, thereby ensuring the tightness and stability of the threaded connection.

[0032] In addition, this force can promote the friction between the inner wall of the internal threaded hole 10 and the elastic connecting part 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, can also form a sealing and leakage-proof effect on the perforated internal threaded hole 10.

[0033] Furthermore, in some embodiments, the elastic connector 2 is made of a reversible elastic deformation material, such as a metal spring or a superelastic alloy.

[0034] Further, 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, and the diameter of the head 1-1 is greater than the diameter of the shank 1-2. In actual use, the head 1-1 of the bolt body 1 can eventually contact the outer surface of the connected member 20, so that the anti-loosening bolt is contacted and locked.

[0035] Further, in some embodiments, a slotted hole structure 1-3 is provided at one end of the head 1-1 away from the rod 1-2. For example, the slotted hole structure 1-3 is a hexagonal hole, which is convenient for the user to use a hexagonal wrench to tighten the bolt.

[0036] Further, in some embodiments, when processing the anti-loosening bolt, the anti-loosening bolt can be processed by fixing and connecting a separately processed elastic structure with a common bolt. When actually using the anti-loosening bolt, the method of using the anti-loosening bolt is basically the same as that of a common bolt currently on the market.

[0037] Example: The bolt body 1 of the anti-loosening bolt is an M6 bolt, wherein the parameter M represents a metric thread, indicating that the thread specification of the bolt is manufactured according to the metric standard (ISO); the parameter 6 represents that the diameter of the bolt is 6 mm, and the pitch of the bolt body 1 is preferably 1 mm.

[0038] The elastic connecting member 2 is an elastic spiral segment, the number of spiral turns is 3-7, and the free pitch is 0.7 mm-0.9 mm. Preferably, the number of spiral turns is 5, and the free pitch (pitch when not subjected to external force) is 0.8 mm.

[0039] It should be understood that expressions such as "include" and "may include" 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 "include" and / or "have" may be interpreted as indicating specific characteristics, numbers, operations, constituent elements, components or combinations thereof, but may not be interpreted as excluding the existence or possibility of adding one or more other characteristics, numbers, operations, constituent elements, components or combinations thereof.

[0040] It should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0041] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0042] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0043] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A locking bolt, characterized in that: include: A bolt body (1) having a first external thread (3), wherein the first external thread (3) of the bolt body (1) is used for threadably matching with an external internal threaded hole (10); an elastic connecting member (2) having a second external thread (4), the elastic connecting member (2) being connected to the bolt body (1), the second external thread (4) and the first external thread (3) forming a continuous thread, the continuous thread being used for threaded connection with an external internal thread hole (10), and When the elastic connecting member (2) is not subjected to external force, the pitch of the second external thread (4) is smaller than the pitch of the first external thread (3).

2. The anti-loosening bolt according to claim 1, characterized in that: The elastic connecting piece (2) is made of a reversible elastic deformation material.

3. The anti-loosening bolt according to claim 1, characterized in that: The elastic connecting piece (2) is a solid screw made of elastic material or an elastic spiral section extending in a spiral shape.

4. The anti-loosening bolt according to claim 1, characterized in that: The tooth profiles of the elastic connecting piece (2) and the bolt body (1) are trapezoidal, triangular, rectangular or sawtooth.

5. The anti-loosening bolt according to claim 1, characterized in that: The length of the thread profile root of the elastic connecting member (2) is greater than the length of the thread profile root of the bolt body (1).

6. The anti-loosening bolt according to any one of claims 1 to 5, characterized in that: The pitch of the first external thread (3) is 1 mm, and the pitch of the second external thread (4) is 0.7 mm-0.9 mm.

7. The anti-loosening bolt according to any one of claims 1 to 5, characterized in that: The bolt body (1) comprises a head (1-1) and a shank (1-2) having the first external thread (3); the diameter of the head (1-1) is greater than the diameter of the shank (1-2).

8. The anti-loosening bolt according to claim 7, characterized in that: A slot structure (1-3) is provided at one end of the head (1-1) away from the rod (1-2).

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