Self-locking nut and self-locking connecting assembly

Abstract

The invention discloses a self-locking nut and a self-locking connecting assembly, and relates to the technical field of machine manufacturing. The self-locking nut comprises a nut main body and a locking piece; a spiral groove is formed in the inner side wall of the threaded hole of the nut body. The locking piece is in a spiral shape corresponding to the shape of the spiral groove and is arranged in the spiral groove in a penetrating manner; the end face, close to the axis of the threaded hole, of the locking piece is provided with internal threads matched with the internal threads in the threaded hole. According to the self-locking nut, when the self-locking nut is connected with a screw to assemble and connect related equipment components, the self-locking nut is in threaded fit with the screw through the internal threads in the threaded hole and the internal threads on the locking piece, and when the self-locking nut is affected by vibration in the equipment using process, the locking piece can deviate relative to the spiral groove along with vibration, so that the self-locking nut is prevented from being damaged. And furthermore, the internal threads in the threaded hole and the internal threads on the locking piece are relatively deviated, so that the threads on the screw rod are engaged, and the screw rod and the nut are matched more firmly and reliably.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical manufacturing, and in particular to a self-locking nut and a self-locking connection assembly. Background Art

[0002] When assembling and installing existing mechanical equipment, bolts and nuts are usually widely used. This connection method is simple and effective, and can ensure the tight connection and stability between equipment components. However, during the use of general nuts, due to various factors such as the vibration generated by the operation of the machine and the impact of the external environment, it is often inevitable that the nuts will automatically fall off. Once the nuts fall off, it will not only cause the interruption of mechanical production and affect production efficiency, but also may cause great harm and safety hazards to the equipment itself and the operators, and in serious cases may even cause equipment damage or personal injury accidents.

[0003] In order to effectively deal with this problem, technicians usually take some improvement measures. One common practice is to use self-locking nuts, which have a special self-locking structure inside the nut, which can prevent the nut from loosening and falling off due to vibration to a certain extent. Another method is to install a spring washer under the ordinary nut and use the elastic force of the spring washer to keep the nut tight. These measures reduce the probability of the nut loosening to a certain extent, and significantly improve the safety and stability of mechanical equipment during use.

[0004] However, it cannot be ignored that the self-locking parts or spring washers of existing self-locking nuts often have some inherent defects. For example, their elastic force is relatively small and the elastic distance is relatively short, which makes it possible for these self-locking parts or spring washers to loosen or even fall off in equipment structures with large vibration amplitudes or high vibration frequencies. In this way, the measures originally intended to improve safety may lose their due role, thereby bringing potential risks to the normal operation of the equipment. Therefore, how to further optimize the anti-loosening design of nuts and improve their stability and reliability in complex vibration environments is still an important issue that needs to be urgently solved in the current field of mechanical equipment manufacturing. Summary of the invention

[0005] In view of this, the purpose of the present invention is to overcome the deficiencies in the related art. The present invention provides a self-locking nut and a self-locking connection assembly.

[0006] The present invention provides the following technical solutions:

[0007] A self-locking nut comprises a nut body and a locking piece.

[0008] On the inner side wall of the threaded hole of the nut body, a spiral groove is provided; the locking member is in a spiral shape corresponding to the shape of the spiral groove and is inserted into the spiral groove; on the end face of the locking member close to the axis of the threaded hole, an internal thread matching the internal thread in the threaded hole is provided.

[0009] As a further improvement of the above technical solution, the helix direction of the spiral groove is opposite to the helix direction of the internal thread in the threaded hole.

[0010] As a further improvement of the above technical solution, the helix angle of the locking member is greater than the helix angle of the internal thread in the threaded hole.

[0011] As a further improvement of the above technical solution, the number of spiral turns of the locking member is at least two.

[0012] As a further improvement of the above technical solution, the spiral grooves are evenly distributed on the inner side wall of the threaded hole.

[0013] As a further improvement of the above technical solution, an assembly opening is provided at one end of the nut body, and the assembly opening is communicated with the spiral groove; the locking member can be inserted into the spiral groove through the assembly opening.

[0014] As a further improvement of the above technical solution, the assembly opening is an annular opening corresponding to the spiral groove.

[0015] As a further improvement of the above technical solution, the thickness of the locking member is greater than the pitch of the teeth of the internal thread in the threaded hole.

[0016] As a further improvement of the above technical solution, the nut body and the locking member are made of the same material.

[0017] The present invention also provides a self-locking connection assembly, including a screw rod and the self-locking nut as described in any one of the above; the screw rod is inserted into the threaded hole of the nut body through thread fit.

[0018] Compared with the related art, the beneficial effects of the present invention are:

[0019] The self-locking nut provided by the present invention shows a unique fastening effect during the process of connecting with a screw rod to assemble and connect related equipment components. Specifically, the self-locking nut forms a tight thread fit with the screw rod through the internal thread in its threaded hole and the internal thread on the locking member. This cooperation method ensures the stability of the nut and the screw rod during the initial assembly.

[0020] When the equipment is subjected to vibration during actual use, the design advantages of the self-locking nut are highlighted. The locking piece can be offset relative to the spiral groove as the vibration acts. This offset is not random, but is adjusted in an orderly manner according to the direction and frequency of the vibration. As the locking piece deviates, the internal thread in the threaded hole and the internal thread on the locking piece will also deviate relative to each other. As a result of this offset, the two have a tighter bite effect on the threads on the screw.

[0021] This bite action not only enhances the tightness of the fit between the screw and the nut, but also significantly improves the reliability of the connection. What’s more advanced is that the more frequently the equipment is subjected to vibration, the more obvious the tendency of the locking member to shift or to shift relative to the threaded hole. This means that in a vibrating environment, the self-locking nut’s ability to bite the screw will continue to increase. In other words, even if the equipment is running under vibration conditions for a long time, the connection between the nut body and the screw will become tighter and tighter without loosening.

[0022] Therefore, the self-locking nut provided by the present invention, through its unique design principle and working mechanism, prevents the loosening problem of the nut to the greatest extent, and provides a strong guarantee for the stable operation of the equipment.

[0023] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 A schematic structural diagram of a self-locking nut from one perspective in one embodiment of the present invention is shown;

[0026] Figure 2 A structural cross-sectional view of a self-locking nut from one perspective in one embodiment of the present invention is shown;

[0027] Figure 3 A schematic structural diagram of a nut from one perspective in one embodiment of the present invention is shown;

[0028] Figure 4 A schematic structural diagram of a locking member from one perspective in an embodiment of the present invention is shown.

[0029] Description of main component symbols:

[0030] 100 - nut body; 110 - threaded hole; 111 - internal thread; 120 - spiral groove; 130 - assembly port; 200 - locking member; 300 - screw; 400 - machine base. Detailed implementation manners

[0031] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation to the present invention.

[0032] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0033] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality of" means two or more unless otherwise specifically defined.

[0034] In the present invention, unless otherwise clearly defined and limited, the terms "mounted", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0036] Combined Figure 1 、 Figure 2 、 Figure 4 As shown, an embodiment of the present invention provides a self-locking nut, including a nut body 100 and a locking member 200.

[0037] A spiral groove 120 is formed on the inner side wall of the threaded hole 110 of the nut body 100; the locking member 200 is in a spiral shape corresponding to the shape of the spiral groove 120 and is inserted into the spiral groove 120; an end surface of the locking member 200 close to the axis of the threaded hole 110 is provided with an internal thread 111 matching the internal thread 111 in the threaded hole 110.

[0038] Specifically, in the process of specifically processing this embodiment, first, a spiral groove 120 is formed on the inner side wall of the threaded hole 110 of the nut body 100. The design of the spiral groove 120 is to accommodate the subsequent spiral locking member 200 to be inserted. Next, the pre-prepared spiral locking member 200 is inserted into the already formed spiral groove 120.

[0039] After the locking member 200 is inserted, the next step is to perform threading on the inner side wall of the threaded hole 110. Threading is a key step. By using a special threading tool, threads matching the screw 300 are cut on the inner wall of the threaded hole 110. In this process, clear, smooth and continuous threads will gradually be formed on the inner wall of the threaded hole 110 and on the locking member 200 itself.

[0040] The formation of such threads not only enhances the bonding force between the nut body 100 and the locking member 200, but also makes the subsequent mating installation with the screw 300 easier and more reliable. Due to the smooth continuity of the threads, the screw 300 will encounter less resistance when being screwed into the threaded hole 110, and thus can more easily achieve the desired fastening effect. The design and implementation of the entire processing process are aimed at improving the reliability and usage efficiency of the product.

[0041] The self-locking nut provided in this embodiment exhibits a unique fastening effect during the process of connecting with the screw rod 300 to assemble and connect relevant equipment components. Specifically, the self-locking nut forms a tight thread fit with the screw rod 300 through the internal thread 111 in its threaded hole 110 and the internal thread 111 on the locking member 200. This fitting method ensures the stability of the nut and the screw rod 300 during initial assembly.

[0042] When the equipment is affected by vibration during actual use, the locking member 200 can undergo relative displacement with respect to the spiral groove 120 under the action of vibration. This displacement is not random but is adjusted orderly according to the direction and frequency of vibration. As the locking member 200 displaces, a corresponding relative displacement also occurs between the internal thread 111 in the threaded hole 110 and the internal thread 111 on the locking member 200. The result of this displacement is that the two produce a tighter biting effect on the thread of the screw rod 300.

[0043] This biting action not only enhances the fitting tightness between the screw rod 300 and the nut but also significantly improves the reliability of the connection. More advanced is that the more frequent the vibration the equipment experiences, the more obvious the tendency of the locking member 200 to displace or be about to displace relative to the threaded hole 110. This means that in a vibrating environment, the biting ability of the self-locking nut on the screw rod 300 will continuously increase. In other words, even if the equipment operates under vibrating conditions for a long time, the connection between the nut body 100 and the screw rod 300 will become tighter and tighter without loosening.

[0044] In some specific embodiments, the helix direction of the spiral groove 120 is opposite to the helix direction of the internal thread 111 in the threaded hole 110, presenting a clever opposite relationship with the helix direction of the internal thread 111 formed inside the threaded hole 110. The principle behind this design is that when the entire device is affected by external vibration or mechanical shock, the locking member 200 located inside the spiral groove 120 may undergo a certain degree of displacement due to the external force. However, precisely because the helix direction of the spiral groove 120 is opposite to the helix direction of the internal thread 111, during this displacement process, the moving direction of the locking member 200 is exactly opposite to the deflection trend direction of the nut body 100 relative to the screw rod 300.

[0045] This design brings significant advantages. First, it effectively counteracts the relative movement tendency between the nut body 100 and the screw 300 caused by vibration, thereby enhancing the connection stability between the two. Second, the locking member 200 and the internal thread 111 on the threaded hole 110 jointly exert a more powerful fastening effect on the thread of the screw 300. This dual fastening mechanism not only improves the firmness of the entire connection but also significantly reduces the risk of loosening under long-term use or in a harsh working environment.

[0046] In some specific embodiments, the helix angle of the locking member 200 is greater than the helix angle of the internal thread 111 in the threaded hole 110, so as to increase the blocking contact surface of the internal thread 111 on it against the loosening of the screw 300 when the locking member 200 is offset due to vibration, which is convenient for further improving the locking ability of the locking member 200 and the internal thread 111 on the threaded hole 110 to the thread of the screw 300 and enhancing the connection reliability between this embodiment and the screw 300.

[0047] In some specific embodiments, the number of turns of the helix of the locking member 200 is at least two; by increasing the number of turns of the helix of the locking member 200, several important improvements are achieved. First, the multi-turn helix design enables the locking member 200 to provide a longer tightening spring distance when it is screwed into the nut body 100. This feature is particularly important when dealing with large external vibration effects, because it can more effectively absorb and disperse vibration energy, thereby reducing the impact and damage to the connection between the nut body 100 and the screw 300.

[0048] Second, the multi-turn helix design also enhances the bonding force between the locking member 200 and the nut body 100. Due to the increase in the number of turns of the helix, the locking member 200 generates more contact points with the internal thread structure inside the nut body 100 during the screwing process. These contact points not only improve the stability of the locking member 200 but also make the entire connection structure more firm and reliable when bearing external forces.

[0049] In some specific embodiments, the spiral grooves 120 are evenly distributed on the inner side wall of the threaded hole 110; by evenly distributing the spiral grooves 120, several key improvements are achieved. First, such a layout ensures that the internal thread 111 on the locking member 200 and the thread on the screw 300 can achieve uniform fit. This means that during the tightening process, the contact area between the locking member 200 and the screw 300 is more uniform, and the force is more balanced, thus avoiding connection loosening or damage caused by excessive local force.

[0050] Secondly, during the vibration, the uniformly distributed spiral grooves 120 can effectively lock and fix the nut body 100 and the screw rod 300 evenly. Since vibration often causes relative movement between connecting components, the uniformly distributed spiral grooves 120 can disperse this movement tendency, making the connection between the nut body 100 and the screw rod 300 more stable. This uniform locking effect not only improves the reliability of the connection but also extends the service life of the connecting components.

[0051] Combined with Figure 2 、 Figure 3 As shown, in some specific embodiments, an assembly port 130 is provided at one end of the nut body 100. The assembly port 130 is in communication with the spiral groove 120. The locking member 200 can easily pass through the assembly port 130 and into the spiral groove 120 without complex operations or adjustments. This feature greatly simplifies the assembly process, reduces the assembly difficulty, and thus improves the overall assembly efficiency. The locking member 200 can pass through the assembly port 130 and into the spiral groove 120. The assembly port 130 is an annular opening corresponding to the spiral groove 120. This annular design not only ensures that the locking member 200 can be smoothly screwed into the spiral groove 120 but also guarantees the stability and accuracy during the screwing process. Since the shape and size of the assembly port 130 match those of the spiral groove 120, the locking member 200 can be screwed in along a predetermined trajectory, avoiding assembly problems caused by deviations.

[0052] In addition, the design of the annular opening also makes the assembly process more intuitive and easy to operate. The staff can clearly see the positions of the assembly port 130 and the spiral groove 120, so as to accurately place the locking member 200 and perform the screwing operation. This design not only improves the assembly accuracy but also reduces the risk of operation errors.

[0053] In some specific embodiments, the thickness of the locking member 200 is greater than the pitch of the internal thread 111 in the threaded hole 110. By restricting the thickness of the locking member 200, several key improvements are achieved. First of all, such a design ensures that at least part of the tooth spaces of the internal thread 111 can be completely formed on the locking member 200. This means that during the process of screwing the locking member 200 into the threaded hole 110, the tooth spaces of the internal thread 111 can fully engage with the thread structure on the locking member 200, thereby enhancing the connection strength and stability between the two.

[0054] Secondly, when the locking member 200 is deflected due to vibration, the locking member 200 can better press and lock the threads of the screw rod 300 because its thickness is greater than the pitch of the internal threads 111. This pressing action not only effectively prevents the locking member 200 from loosening due to vibration, but also further improves the stability and reliability of the entire connection structure.

[0055] In addition, the increased thickness of the locking member 200 also makes it more resistant to deformation when subjected to external forces. Since the locking member 200 is thicker, it can maintain better shape stability when subjected to pressure or tension, thereby avoiding connection failure caused by deformation.

[0056] In some specific embodiments, the nut body 100 and the locking member 200 are made of the same material; specifically, by using the same material to process and produce the nut body 100 and the locking member 200, the consistency of the physical and chemical properties of the two can be ensured, thereby bringing many advantages. After the locking member 200 is inserted into the spiral groove 120 of the nut body 100, due to the same material, the fit between the locking member 200 and the nut body 100 will be tighter, reducing friction and wear that may be caused by material differences.

[0057] Furthermore, when the inner wall of the threaded hole 110 of the nut body 100 is tapped, since the locking piece 200 and the nut body 100 are made of the same material, their physical properties such as thermal expansion coefficient and hardness are similar, which enables the locking piece 200 to better adapt to the changes of the inner wall of the threaded hole 110 when subjected to force, thereby ensuring that the thread shape of the locking piece 200 and the inner wall of the threaded hole 110 is more consistent. This consistency is not only reflected in the pitch and depth of the thread, but also in the smoothness of the thread.

[0058] Therefore, when the screw 300 needs to be inserted into the threaded hole 110 for use later, since the thread shapes of the locking piece 200 and the inner wall of the threaded hole 110 are highly consistent and smooth, the insertion process of the screw 300 will be smoother, reducing the jamming and resistance caused by thread mismatch. This not only improves work efficiency, but also reduces the risk of damage to parts due to improper operation or thread mismatch. In summary, using the same material to process and produce the nut body 100 and the locking piece 200 is a practical and efficient design solution.

[0059] Furthermore, the locking piece 200 and the nut body 100 can be specifically manufactured using stainless steel. Stainless steel is widely used in various occasions that need to withstand high loads and harsh environments due to its excellent corrosion resistance, high strength and good mechanical properties. The nut body 100 and locking piece 200 made of stainless steel can effectively resist external corrosion and erosion, thereby extending the service life of the product. At the same time, the high strength characteristics of stainless steel also ensure that the nut body 100 and the locking piece 200 can still maintain stable connection performance when subjected to large loads.

[0060] In addition, stainless steel has good processing performance and plasticity, which makes the manufacturing process of the nut body 100 and the locking piece 200 more efficient and accurate. Through precise processing technology, the dimensional accuracy and surface quality of the nut body 100 and the locking piece 200 can be ensured to meet the design requirements, thereby further improving the reliability and safety of the product.

[0061] Of course, in other embodiments of the present invention, the nut body 100 and the locking piece 200 may also be manufactured using other different materials to meet the needs of actual scenarios. The nut body 100 and the locking piece 200 may also be made of different materials as needed to expand the application field of the present invention.

[0062] An embodiment of the present invention also provides a self-locking connection assembly, comprising a screw rod 300 and a self-locking nut as described in any one of the above; the screw rod 300 is threadedly inserted into the threaded hole 110 of the nut body 100, thereby achieving reliable assembly of the base 400 and related components of the relevant equipment; the self-locking connection assembly has all the effects of the self-locking nut, which will not be described in detail here.

[0063] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0064] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A self-locking nut, characterized in that, include: A nut body (100), wherein a spiral groove (120) is provided on the inner side wall of the threaded hole (110) of the nut body (100); A locking piece (200) is in a spiral shape corresponding to the shape of the spiral groove (120) and is inserted into the spiral groove (120); an end surface of the locking piece (200) close to the axis of the threaded hole (110) is provided with an internal thread (111) matching the internal thread (111) in the threaded hole (110).

2. The self-locking nut according to claim 1, wherein, The direction of rotation of the spiral groove (120) is opposite to the direction of rotation of the internal thread (111) in the threaded hole (110).

3. The self-locking nut according to claim 2, characterized in that, The helix angle of the locking member (200) is greater than the helix angle of the internal thread (111) in the threaded hole (110).

4. The self-locking nut according to claim 1, wherein, The number of spiral turns of the locking member (200) is at least two.

5. The self-locking nut according to claim 4, characterized in that, The spiral grooves (120) are evenly distributed on the inner side wall of the threaded hole (110).

6. The self-locking nut according to claim 1, characterized in that, An assembly opening (130) is provided at one end of the nut body (100), and the assembly opening (130) is communicated with the spiral groove (120); the locking member (200) can pass through the assembly opening (130) and penetrate into the spiral groove (120).

7. The self-locking nut according to claim 6, characterized in that, The assembly opening (130) is an annular opening corresponding to the spiral groove (120).

8. The self-locking nut according to any one of claims 1 to 7, characterized in that, The thickness of the locking member (200) is greater than the pitch of the internal threads (111) in the threaded hole (110).

9. The self-locking nut according to any one of claims 1 to 7, characterized in that, The nut body (100) and the locking member (200) are made of the same material.

10. A self-locking connection component, characterized in that, It comprises a screw rod (300) and a self-locking nut as claimed in any one of claims 1 to 9; the screw rod (300) is inserted into a threaded hole (110) of the nut body (100) by threaded engagement.

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