Anti-loosening device applied to threaded connection and threaded connection structure

Abstract

This invention provides an anti-loosening device and a threaded connection structure for use in threaded connections. A first washer, an elastic element, and a second washer are sequentially arranged between the connected component and the nut. The first washer has a first anti-loosening structure on its first side, and the second washer has a second anti-loosening structure on its second side. Both the first and second anti-loosening structures have several first surfaces extending obliquely along a first direction. When the first and second washers separate along the first direction due to relative rotation, and significant vibration causes the nut to loosen, the nut drives the second washer to rotate relative to the first washer. The elastic element facilitates this rotation, and the first surfaces force the second washer away from the first washer along the first direction. Since the angle between the first direction and the thread loosening direction is greater than the thread lead angle, the second washer can push the nut along the bolt axis to apply tension to the bolt, thereby compensating for the loss of preload caused by nut loosening.

Description

Technical Field

[0001] This application relates to the field of threaded connection technology, and in particular to an anti-loosening device and a threaded connection structure applied to threaded connections. Background Technology

[0002] In the mechanical and engineering fields, threaded connections are a fundamental type of connection widely used in various equipment, pipelines, and mechanical components. However, with the increasing complexity of equipment operating environments, especially in the face of external factors such as vibration, impact, and temperature changes, the stability of threaded connections has become increasingly prominent. After prolonged use, particularly under vibration loads, traditional threaded connections often experience a decrease in preload, and may even loosen or slip out. This not only affects the normal operation of equipment but may even lead to safety accidents. Summary of the Invention

[0003] To address the aforementioned problems in the prior art, this invention provides an anti-loosening device for threaded connections and a threaded connection structure, which can enhance the reliability of threaded connections.

[0004] To achieve the above objectives, in a first aspect, the present invention provides an anti-loosening device for threaded connections, comprising: A first gasket, the first gasket including a first side; The second gasket includes a second side, which is disposed opposite to the first side; The anti-loosening component includes a first anti-loosening structure and a second anti-loosening structure. The first anti-loosening structure is disposed on the first side, and the second anti-loosening structure is disposed on the second side. The projection positions of the first anti-loosening structure and the second anti-loosening structure on the first gasket or the second gasket are the same. The first anti-loosening structure and the second anti-loosening structure include a plurality of first surfaces distributed along the circumference of the first gasket. The first surface has a first end and a second end along the circumferential direction of the gasket. The points on the first end and the second end are at different distances from the gasket where the anti-loosening structure is located, while the points on the same end are at the same distance from the gasket. The first direction is the perpendicular direction from the point on the first end to the second end. An elastic element, the elastic element including a first connecting portion and a second connecting portion, the first connecting portion being connected to a first side, and the second connecting portion being connected to a second side; The projection of the normal vector of each first surface onto the axial end face of the first gasket is fitted into a directed closed loop. The direction of the directed closed loop is the same as the direction of rotation of the threaded connection, and the angle β between the first direction and the axial end face of the first gasket is greater than the lead angle of the threaded connection.

[0005] As an optional implementation, the elastic member includes a first elastic portion and a second elastic portion, the first elastic portion and the second elastic portion are alternately arranged and connected to each other along the circumference of the first gasket, so that the elastic member forms a ring shape, and the first connecting portion and the second connecting portion are respectively disposed at both ends of the second elastic portion; In its natural state, along the circumferential direction of the first gasket, the first elastic portion and the second elastic portion periodically warp towards the axial direction of the first gasket, the first elastic portion is compressed or recovers along the axial direction of the first gasket, and the second elastic portion is compressed or recovers along the circumferential direction of the first gasket. The natural state refers to the state in which the first elastic part and the second elastic part are not subjected to any external force.

[0006] As an optional implementation, the first anti-loosening structure and the second anti-loosening structure further include a second surface, which is connected to the first surface, and the normal vector of the second surface is tangent to the directed closed loop; the first side and / or the second side are provided with a fixing part along the circumference of the first gasket, and the fixing part is provided corresponding to the first connecting part or the second connecting part; The first connecting portion abuts against the second surface located on the first side, or abuts against the fixing portion located on the first side; The second connecting portion abuts against the second surface located on the second side, or abuts against the fixing portion on the second side.

[0007] As an optional implementation, the first side and / or the second side are provided with a receiving cavity along the circumference of the first gasket. The receiving cavity includes a first control area and a second control area, which are alternately arranged along the circumference of the first gasket. The first elastic part is disposed in the first control area, and the second elastic part is disposed in the second control area. Wherein, the height of the first control area along the axial direction of the first gasket is less than the height of the first elastic part along the axial direction of the first gasket in its natural state; the height of the second control area along the axial direction of the first gasket is greater than the height of the second elastic part along the axial direction of the first gasket in its natural state.

[0008] As an optional implementation, a first receiving portion is provided on the first side, the first receiving portion extending circumferentially along the first gasket, and a second receiving portion is provided on the second side, the second receiving portion being disposed corresponding to the first receiving portion, the first receiving portion and the second receiving portion having the same height along the axial direction of the first gasket, and the second receiving portion cooperating with the first receiving portion to form the receiving cavity.

[0009] As an optional implementation, the number of first surfaces located on the first gasket and the number of first surfaces located on the second gasket are both no less than 5, and the plurality of first surfaces are arranged continuously along the circumference of the first gasket.

[0010] As an optional implementation, the angle β formed by the first direction and the axial end face of the first gasket satisfies the relationship μ with respect to the coefficient of friction μ between the first surface of the first anti-loosening structure and the first surface of the second anti-loosening structure. <tanβ。

[0011] As an optional implementation, the first gasket further includes a third side, and the second gasket further includes a fourth side, the third side being disposed opposite to the first side, and the fourth side being disposed opposite to the second side; the third side and the fourth side include contact surfaces, the contact surfaces including a first region and a second region alternately disposed along the circumference of the first gasket, the first region being provided with a fixing structure, the fixing structure being used to fix the first gasket to the threaded connection, and / or fix the second gasket to the threaded connection; The surface of the second region is rough. Wherein, the area of ​​the first region is greater than or equal to the area of ​​the second region, or the area of ​​the first region is less than the area of ​​the second region.

[0012] As an optional implementation, the fixing structure is a fixing groove, the fixing structure includes a bottom surface, the bottom surface is inclined in the first direction, and the bottom surface extends from the bottom of the fixing groove to the top of the fixing groove.

[0013] Secondly, the present invention provides a threaded connection structure, comprising: The nut, bolt, connected component one, and anti-loosening device for threaded connection as described in any of the above embodiments, wherein the first side abuts against the connected component one, the second side abuts against the nut, the bolt passes through the connected component one, the first washer, and the second washer in sequence, and the nut is connected to the bolt; Alternatively, it may include a screw, a second connected component, and an anti-loosening device for threaded connections as described in any of the above embodiments, wherein the second connected component is provided with a threaded hole, the first washer and the second washer are provided corresponding to the threaded hole, and the screw is sequentially passed through the second washer, the first washer, and the threaded hole.

[0014] The beneficial effects of this invention are as follows: The present invention relates to an anti-loosening device for threaded connections. This device comprises a first washer, an elastic element, and a second washer sequentially arranged between the connected component and the nut. The first washer has a first anti-loosening structure on its first side, and the second washer has a second anti-loosening structure on its second side. Both the first and second anti-loosening structures have a plurality of first surfaces extending obliquely along a first direction. These first surfaces allow the first and second washers to separate along the first direction when they rotate relative to each other. When vibration is minimal, the elastic element between the first and second washers can buffer the vibration. When vibration is significant and causes the nut to loosen, the nut drives the second washer to rotate relative to the first washer. The elastic element facilitates this rotation, and the first surfaces force the second washer away from the first washer along the first direction. Since the angle between the first direction and the thread loosening direction is greater than the thread lead angle, the second washer can push the nut along the bolt axis to apply tension to the bolt, thereby compensating for the loss of threaded connection preload caused by nut loosening, and thus achieving the anti-loosening effect. Attached Figure Description

[0015] Figure 1 A schematic diagram of a threaded connection structure provided in an embodiment of the present invention; Figure 2 for Figure 1 Explosion diagram of the anti-loosening device; Figure 3 for Figure 2 A magnified view of a portion of region L in the middle; Figure 4 for Figure 2 Schematic diagram of the elastic element; Figure 5 Figure 1 A cross-sectional schematic diagram of the anti-loosening device along the radial direction of the first gasket.

[0016] Explanation of reference numerals in the attached figures Anti-loosening device, 100; Nut, 201; Bolt, 202; Connected part, 203; First gasket, 1; First side, 11; Clearance groove, 111; Receiving cavity, 112; First control area, 1121; Second control area, 1122; First receiving part, 112a; Second receiving part, 112b; Fixing part, 113; Third side, 12; Second gasket, 2; Second side, 21; Fourth side, 22; Contact surface, 221; First region, 2211; Fixing structure, 22111; Bottom surface, 22111a; Second region, 2212; Anti-loosening component 3; First anti-loosening structure 31; First surface 311; First end 3111; Second end 3112; Second surface 312; Second anti-loosening structure 32; 4; 41; 42; 43; 44; 43; 44; First direction, X; angle β between the first direction and the axial end face of the first gasket. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] In this invention, the terms "upper," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing the invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0019] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in certain situations to indicate a dependency or connection. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0020] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a direct connection, an indirect connection via an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0021] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0022] In the mechanical and engineering fields, threaded connections are a fundamental type of connection widely used in various equipment, pipelines, and mechanical components. However, with the increasing complexity of equipment operating environments, especially in the face of external factors such as vibration, impact, and temperature changes, the stability of threaded connections has become increasingly prominent. After prolonged use, particularly under vibration loads, the preload between the bolt and nut in traditional threaded connections gradually decreases under vibration, leading to loosening. Furthermore, vibration causes minute relative displacements between the connected components, disrupting the original preload balance and causing a further reduction in preload. Under these conditions, threaded connections are prone to loosening and slippage, which not only affects the normal operation of equipment but may even lead to safety accidents.

[0023] Based on this, the present invention provides an anti-loosening device for threaded connections and a threaded connection structure. A first washer, an elastic element, and a second washer are sequentially arranged between the connected component and the nut. The first washer has a first anti-loosening structure on its first side, and the second washer has a second anti-loosening structure on its second side. Both the first and second anti-loosening structures have several first surfaces extending obliquely along a first direction. These first surfaces allow the first and second washers to separate along the first direction when they rotate relative to each other. When vibration is small, the elastic element between the first and second washers can buffer the vibration. When vibration is large and causes the nut to loosen, the nut drives the second washer to rotate relative to the first washer. The elastic element promotes this rotation, and the first surfaces force the second washer away from the first washer along the first direction. Since the angle between the first direction and the thread loosening direction is greater than the thread lead angle, the second washer can push the nut along the bolt axis to apply tension to the bolt, thereby compensating for the loss of threaded connection preload caused by nut loosening, and thus achieving the anti-loosening effect.

[0024] The technical solution of the present invention will be further described below with reference to the embodiments and accompanying drawings.

[0025] Please see, Figures 1 to 3 This invention discloses an anti-loosening device and a threaded connection structure applied to threaded connections. The threaded connection structure includes a nut, a bolt, a first connected component, and the anti-loosening device. The anti-loosening device is disposed between the first connected component and the nut. The bolt passes through the first connected component and the anti-loosening device sequentially, and the nut is connected to the bolt. Alternatively, it includes a screw, a second connected component, and the anti-loosening device. The second connected component has a threaded hole, and the anti-loosening device is disposed corresponding to the threaded hole. The screw passes through the anti-loosening device and the threaded hole sequentially. For ease of understanding, the following description is based on the use of a common bolt 202 and nut 201 to form a threaded connection, and uses the first connected component as the connected component 203. Obviously, the same characteristics as described below also apply when using a screw and a second connected component.

[0026] Specifically, the anti-loosening device 100 includes a first gasket 1, a second gasket 2, an anti-loosening component 3, and an elastic element 4. The first gasket 1 includes a first side 11. The second gasket 2 includes a second side 21, which is disposed opposite to the first side 11. The anti-loosening component 3 includes a first anti-loosening structure 31 and a second anti-loosening structure 32. The first anti-loosening structure 31 is disposed on the first side 11, and the second anti-loosening structure 32 is disposed on the second side 21. The first anti-loosening structure 31 and the second anti-loosening structure 32 have the same projection position on the first gasket 1 or the second gasket 2. The first anti-loosening structure 31 and the second anti-loosening structure 32 include a plurality of first surfaces 311 distributed circumferentially along the first gasket 1. Each first surface 311 has a first end 3111 and a second end 3112 along the circumferential direction of the first gasket 1. 111. The distances from the points on the second end 3112 to the gaskets (first gasket 1 or second gasket 2) where the anti-loosening structure (first anti-loosening structure 31 or second anti-loosening structure 32) is located are different, while the distances from the points on the same end (first end 3111 or second end 3112) to the gaskets are the same. The first direction X is the perpendicular direction from the point on the first end 3111 to the second end 3112. The elastic member 4 includes a first connecting part 43 and a second connecting part 44. The first connecting part 43 is connected to the first side 11, and the second connecting part 44 is connected to the second side 42. Among them, the projection of the normal vector of each first surface 311 onto the axial end face of the first gasket 1 is fitted into a directed closed loop. The direction of the directed closed loop is the same as the direction of rotation of the threaded connection, and the angle β between the first direction X and the axial end face of the first gasket 1 is greater than the lead angle of the threaded connection.

[0027] In this embodiment, the anti-loosening device 100 is used by sequentially placing a first washer 1, an elastic element 4, and a second washer 2 between the connected component 203 and the nut 201. When the nut 201 is tightened, under the action of the nut 201, the second washer 2, guided by the first surface 311, moves closer to the first washer 1 along the first direction, while simultaneously compressing the elastic element 4, until the first washer 1 and the second washer 2 are fully engaged. After the nut 201 is tightened, the deformation of the elastic element 4 has at least two components: one is compression along the axial direction of the bolt 202, and the other is compression along the tightening direction of the bolt 202. When the vibration experienced by the threaded connection structure is weak and insufficient to directly cause the nut 201 to loosen significantly, the elastic element 4 can act like a spring washer. On the one hand, it can provide additional clamping force and friction to the threaded pair and maintain the preload force when the threaded connection is initially tightened. On the other hand, it can also absorb and disperse vibration, providing damping and shock absorption effects, reducing the impact between the components, thereby protecting the fasteners from loosening or fatigue.

[0028] When the threaded connection is subjected to strong vibrations sufficient to cause the nut 201 to loosen significantly, the nut 201 rotates Δθ in the direction of loosening the threaded connection, the threaded connection preload decreases, and the bolt 202 shortens accordingly. Where Δθ is less than or equal to the arc corresponding to the first surface 311. Under the frictional force between the nut 201 and the second washer 2 (or the action of other forms of fixing structures or fixing effects), and under the elastic force generated by the elastic element 4 restoring deformation (or the tendency to restore deformation) in the direction of thread loosening, the second washer 2 rotates Δθ with the nut 201. At the same time, under the guidance of the first surface 311, it moves away from the first washer 1 along the axial direction of the bolt 202 and lifts the nut 201, causing the bolt 202 to elongate. Assuming other components are ideal rigid bodies, and considering only the stiffness of bolt 202 itself and the elasticity of elastic element 4, let the initial preload of bolt 202 be F (i.e., the preload when nut 201 is not loosened), and the stiffness of bolt 202 be c. Then, after the above process, the preload of bolt 202... It becomes: =F+ - (1) Furthermore, the mean diameter of bolt 202 is d, the lead angle is α, and the angle between the first direction and the thread loosening direction is β. As mentioned above, 0 < α < β < π / 2. Substituting into equation (1) and rearranging, we get: =F+cdΔθ(tanβ-tanα) / 2 (2) Since 0 < α < β < π / 2, tanβ - tanα > 0. All terms in the above formula are positive. That is, under the action of the anti-loosening device 100 in this embodiment, the slight loosening of the nut 201 will cause the preload to increase, making it more difficult for the nut 201 to loosen, thereby achieving the purpose of preventing the threaded connection from loosening.

[0029] It should be noted that the prerequisite for achieving the above results is that the second washer 2 rotates at the same angle as the nut 201. When the nut 201 just begins to loosen or shows a tendency to loosen, the elastic element 4 is used to promote the movement of the second washer 2 in the first direction to prevent the nut 201 from separating from the second washer 2, which would cause the anti-loosening device 100 to fail. On the one hand, the elastic element 4 can provide elastic force along the axial direction of the bolt 202 to press the second washer 2 and the nut 201 together; on the other hand, the elastic element 4 can also provide elastic force along the first direction, or the component of the circumferential elastic force of the first washer 1 in the first direction, to promote the separation of the second washer 2 from the first washer 1 in the first direction.

[0030] It should be noted that the above conclusion is derived by considering the components other than bolt 202 and elastic element 4 as ideal rigid bodies. In practice, the above conclusion can still be obtained even if the elasticity of the connected parts 203, first washer 1, second washer 2 and nut 201 is considered.

[0031] It should be noted that the loosening of the threaded connection with the anti-loosening device 100 of this embodiment, which is subjected to vibration and other factors, is fundamentally different from manually loosening the nut 201 when disassembling the threaded connection. When subjected to vibration, the nut 201 and the second washer 2 rotate continuously in the direction of loosening the threaded connection. The rotation angle Δθ per unit time is not greater than the arc corresponding to the pair of first surfaces 311. Within this rotation range, the pair of first surfaces 311 will not disengage from the mating state. Due to the effect of the anti-loosening device 100 of this embodiment, the preload of the threaded connection continues to rise until it balances the loosening effect caused by vibration or the vibration stops, and the nut 201 stops rotating. When manually loosening the nut, at least two stages are required: the first stage is to rotate the nut 201 and the second washer 2 until the first anti-loosening structure 31 and the second anti-loosening structure 32 disengage, and the different first surfaces 311 can no longer form a sliding fit, and the anti-loosening device 100 fails; the second stage is to disassemble the nut 201 normally. In the first stage, the force for disassembling the threaded connection continues to act and can always overcome the resistance caused by the preload of the threaded connection until the second stage is entered. This characteristic of continuous action and the ability to consistently overcome obstacles is something that the loosening effect caused by vibration lacks. It is easy to understand that the above discussion is based on the premise that the load-bearing limit of the anti-loosening device does not exceed 100.

[0032] For example, the elastic element 4 may be a spring or a rubber washer, or it may be the elastic element 4 described below. This embodiment is not limited to this.

[0033] Optionally, the elastic element 4 includes a first elastic portion 41 and a second elastic portion 42, which are alternately arranged and connected to each other along the circumference of the first gasket 1, forming a ring shape. At least the second elastic portion 42 is connected to the first side 11 and the second side 21. A first connecting portion 43 and a second connecting portion 44 are respectively provided at both ends of the second elastic portion 42. In its natural state, along the circumference of the first gasket 1, the first elastic portion 41 and the second elastic portion 42 periodically warp along the axial direction of the first gasket 1. The first elastic portion 41 is compressed or recovers along the axial direction of the first gasket 1, and the second elastic portion 42 is compressed or recovers along the circumference of the first gasket 1. The natural state is when the first elastic portion 41 and the second elastic portion 42 are not subjected to any external force. In this way, when the elastic element 4 is working, the first elastic part 41 and the second elastic part 42 are only subjected to pressure along the axial direction of the first gasket 1 and pressure along the circumferential direction of the first gasket 1, respectively, and produce corresponding deformations. The stress situation is relatively simple, avoiding the situation where the same part of the same component bears multiple different loads at the same time. This facilitates design verification by designers and maintenance analysis by construction personnel. Furthermore, this arrangement of the first elastic part 41 and the second elastic part 42 makes the elastic element 4 an integral structure, which is convenient for manufacturing and installation.

[0034] Optionally, the first anti-loosening structure 31 and the second anti-loosening structure 32 further include a second surface 312, which is connected to the first surface 311, and the normal vector of the second surface 312 is tangent to the directed closed loop; the first side 11 and / or the second side 21 are provided with a fixing part 113 along the circumference of the first gasket 1, and the fixing part 113 is provided corresponding to the first connecting part 43 or the second connecting part 44; The first connecting part 43 abuts against the second surface 312 located on the first side 11, or abuts against the fixing part 113 located on the first side 11; The second connecting portion 44 abuts against the second surface 312 located on the second side 21, or against the fixing portion 113 on the second side 21. The second connecting portion 44 is used to move closer to or further away from the first connecting portion 43 along the circumference of the first gasket 1 to compress or restore the second elastic portion 42. In practice, it can be selected that both the first connecting portion 43 and the second connecting portion 44 abut against the fixing portion 113, both the first connecting portion 43 and the second connecting portion 44 abut against the second surface 312, or one of the first connecting portion 43 and the second connecting portion 44 abuts against the fixing portion 113 and the other abuts against the second surface 312. The provision of the fixing portion 113 and the second surface 312 makes the connection between the second elastic portion 42 and the first gasket 1 and the second gasket 2 more reliable, and can also serve as an indicator when installing the elastic element 4 in practice, ensuring the efficiency and quality of installing the elastic element 4 during construction. It can be seen that the provision of the first connecting portion 43 and the second connecting portion 44 can improve the reliability and convenience of using the anti-loosening device 100 in this embodiment.

[0035] Furthermore, at least on the first side 11, a clearance groove 111 is provided corresponding to the movement trajectory of the second connecting part 44. The clearance groove 111 is used to provide movement space for the second connecting part 44.

[0036] Please refer to the following: Figures 1 to 5 Optionally, the first side 11 and / or the second side 21 are provided with a receiving cavity 112 along the circumference of the first gasket 1. The receiving cavity 112 includes a first control area 1121 and a second control area 1122, which are alternately arranged along the circumference of the first gasket 1. A first elastic part 41 is disposed in the first control area 1121, and a second elastic part 42 is disposed in the second control area 1122. The height of the first control area 1121 along the axial direction of the first gasket 1 is less than the height of the first elastic part 41 along the axial direction of the first gasket 1 in its natural state. The height of the second control area 1122 along the axial direction of the first gasket 1 is greater than the height of the second elastic part 42 along the axial direction of the first gasket 1 in its natural state. When using the aforementioned elastic element 4, after the anti-loosening device 100 is installed, the first elastic part 41 is compressed along the axial direction of the first gasket 1 and simultaneously elongates along the circumference of the first gasket 1. The second elastic part 42 is compressed along the circumference of the first gasket 1 and simultaneously bulges along the axial direction of the first gasket 1. In the entire receiving cavity 112, only the height of the first control area 1121 is less than the height of the elastic member 4, which can provide a compression effect to the elastic member 4. Only the height of the second control area 1122 is greater than the height of the elastic member 4, which can provide sufficient space for the deformation of the second elastic part 42. This effectively controls the deformation of the first elastic part 41 and the second elastic part 42, guides the first elastic part 41 and the second elastic part 42 to deform in the expected way, and ensures that the elastic member 4 can play its expected role.

[0037] Optionally, a first receiving portion 112a is provided on the first side 11, extending circumferentially along the first gasket 1. A second receiving portion 112b is provided on the second side 21, corresponding to the first receiving portion 112a. The heights of the first receiving portion 112a and the second receiving portion 112b along the axial direction of the first gasket are equal. The second receiving portion 112b cooperates with the first receiving portion 112a to form a receiving cavity 112. In practice, the first receiving portion 112a and the second receiving portion 112b can be configured to have identical shapes, thereby eliminating the difference between the first gasket 1 and the second gasket 2. This ensures that the first gasket 1 and the second gasket 2 differ only in their usage methods and not in their shapes. This allows the first gasket 1 and the second gasket 2 to be manufactured using identical equipment and processes. For example, when using powder metallurgy or stamping processes, identical molds can be used, thereby reducing production costs. During use or in the warehousing and logistics stage, construction personnel do not need to distinguish between the first gasket 1 and the second gasket 2, which improves the convenience of construction.

[0038] Optionally, the number of first surfaces 311 on the first washer 1 and the number of first surfaces 311 on the second washer 2 are both no less than five, and the multiple first surfaces 311 are arranged continuously along the circumference of the first washer 1. In use, since the first surfaces 311 extend along the first direction, they provide two forces to the second washer 2 and the nut 201: one is a thrust along the axial direction of the bolt 202, and the other is a tangential force along the axial direction of the first washer 1. In practice, it is generally desirable that the thrust is evenly distributed along the circumference of the nut 201 and that the resultant force of the tangential force is zero, so as to avoid applying additional bending moment to the bolt 202 and improve the reliability and service life of the bolt 202. The arrangement of the first face 311 has several advantages. Firstly, it ensures that all the first faces 311 are evenly arranged around the first washer 1, theoretically making the thrust evenly distributed around the nut 201 and the resultant force of the tangential force zero. Secondly, in practice, due to manufacturing errors, such as errors in the position or tilt angle of the first face 311, the tangential force generated by one group of first faces 311 may not be able to completely cancel out the tangential force generated by another group of first faces 311, or the thrust on various parts of the nut 201 may be uneven, resulting in additional bending moments. The arrangement of the first face 311 in this embodiment can arrange as many first faces 311 as possible, so that the adverse effects caused by manufacturing errors of different first faces 311 are uniformized, thereby reducing the additional bending moment generated by the anti-loosening device 100 on the bolt 202 in this embodiment, and thus improving the reliability of the threaded connection structure.

[0039] Optionally, the included angle β formed by the first direction and the direction of loosening the threaded connection, and the coefficient of friction between the first surface 311 of the first anti-loosening structure 31 and the first surface 311 of the second anti-loosening structure 32. Satisfying the relationship In this way, the first mating surface 311 will not self-lock under the preload. In practice, after a vibration stops, under the preload, the first washer 1 and the second washer 2 will tend to return to their initial installation position, instead of the second washer 2 remaining away from the first washer 1. This ensures that the anti-loosening device 100 of this embodiment has sufficient capacity to cope with the next vibration. It is evident that this design improves the anti-loosening device 100's ability to withstand intermittent vibration.

[0040] It should be noted that the coefficient of friction can be reduced by adding lubricating medium, reducing the surface roughness of the first surface 311, or using materials with a low coefficient of friction to manufacture the first gasket 1 and the second gasket 2. In practice, the appropriate method should be selected based on specific needs.

[0041] Optionally, the first gasket 1 further includes a third side 12, and the second gasket 2 further includes a fourth side 22. The third side 12 is disposed opposite to the first side 11, and the fourth side 22 is disposed opposite to the second side 21. The third side 12 and the fourth side 2222 include contact surfaces 221. The contact surfaces 221 include a first region 2211 and a second region 2212 alternately arranged circumferentially along the first gasket 1. The first region 2211 is provided with a fixing structure 22111, which is used to fix the first gasket 1 to the threaded connection, and / or fix the second gasket 2 to the threaded connection. The surface of the second region 2212 is a rough surface. Wherein, the area of ​​the first region 2211 is greater than or equal to the area of ​​the second region 2212, or the area of ​​the first region 2211 is less than the area of ​​the second region. As mentioned earlier, to ensure the anti-loosening function of the anti-loosening device 100 in this embodiment, it is necessary to ensure that when the nut 201 becomes loose, the second washer 2 can rotate with the nut 201 at the same angle. The fixing structure 22111 is set to fix the first washer 1 relative to the connected part 203, and the second fixing structure 22111 is set to fix the second washer 2 relative to the nut 201. Since the fixing structure 22111 is prefabricated on the anti-loosening device 100, no additional operation is required on the construction site, which helps to simplify the on-site construction process and reduce the labor intensity of the operators.

[0042] For example, the fixing structure 22111 can be a ratchet or spike structure, or a barbed structure. During use, as the nut 201 is tightened, the fixing structure 22111 will embed into the surface of the connected component 203, thereby fixing the first washer 1 relative to the connected component 203 and the second washer 2 relative to the nut 201. It should be noted that when the fixing structure 22111 is a structure such as a ratchet, spike, or barbed structure that is destructive to the surface of the connected component 203 or the nut 201, the hardness of the surface of the first washer 1 needs to be greater than the hardness of the surface of the connected component 203, and the hardness of the surface of the second washer 2 needs to be greater than the hardness of the nut 201.

[0043] The ratchet, spike, or other spike structures described above are destructive to the surfaces of the connected component 203 and the bolt 202, leaving pits on their surfaces during installation. When prioritizing the degree of damage to the connected component 203 and the nut 201 caused by the fixing structure 22111, the area of ​​the first region 2211 can be made smaller than the area of ​​the second region 2212. Conversely, when prioritizing the fixing effect of the fixing structure 22111, the area of ​​the first region 2211 can be made greater than or equal to the area of ​​the second region 2212. In practice, the specific requirements should be considered comprehensively, which will not be elaborated upon in this embodiment.

[0044] Optionally, the fixing structure 22111 is a fixing groove, which includes a bottom surface 22111a. The bottom surface 22111a is inclined along a first direction and extends from the bottom of the fixing groove to the top of the fixing groove. In this embodiment, when the anti-loosening device 100 is in use, due to the pre-tightening force, the surfaces of the connected member 203 and the nut 201 are squeezed and embedded in the fixing structure 22111. Since the inclination direction of the bottom surface 22111a is opposite to the rotation direction of the threaded connection, it will not be affected by the fixing structure 22111 when the threaded connection is tightened. When the threaded connection is loosened, the parts of the connected member 203 and the nut 201 embedded in the fixing structure 22111 will not easily come out, thereby fixing the first washer 1 relative to the connected member 203 and the second washer 2 relative to the nut 201.

[0045] The ratchet, spike, or other structures mentioned above are destructive to the surfaces of the connected parts 203 and bolts 202, leaving pits on their surfaces during installation. In cases where this threaded connection requires frequent disassembly and assembly, it cannot be guaranteed that the ratchet, spike, or other structures will correctly engage with the pits created in the previous installation. Especially after multiple disassemblies and assemblies, pits from different installations may become adjacent or overlap, reducing the load-bearing capacity of the pit's outer wall and making it prone to crushing and failure. This results in the fixing structure 22111 losing its fixing function for the first washer 1 or the second washer 2. In this embodiment, a fixing groove is used as the fixing structure 22111. The portions of the connected parts 203 and nut 201 embedded in the fixing structure 22111 have plastic deformation zones and elastic deformation zones. After the threaded connection is disassembled, the elastic deformation zone will recover, and only the plastic deformation zone will produce a pit. Compared with the pits produced by ratchet teeth, thorns, or spikes, the pit area is smaller and the depth is shallower, thus creating favorable conditions for repeated disassembly and assembly. It can be seen that the anti-loosening device 100 of this embodiment can better adapt to working environments that require frequent disassembly and assembly.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An anti-loosening device for threaded connections, characterized in that, include: A first gasket, the first gasket including a first side; The second gasket includes a second side, which is disposed opposite to the first side; The anti-loosening component includes a first anti-loosening structure and a second anti-loosening structure. The first anti-loosening structure is disposed on the first side, and the second anti-loosening structure is disposed on the second side. The projection positions of the first anti-loosening structure and the second anti-loosening structure on the first gasket or the second gasket are the same. The first anti-loosening structure and the second anti-loosening structure include a plurality of first surfaces distributed along the circumference of the first gasket. The first surface has a first end and a second end along the circumferential direction of the gasket. The points on the first end and the second end are at different distances from the gasket where the anti-loosening structure is located, while the points on the same end are at the same distance from the gasket. The first direction is the perpendicular direction from the point on the first end to the second end. An elastic element, the elastic element including a first connecting portion and a second connecting portion, the first connecting portion being connected to a first side, and the second connecting portion being connected to a second side; The projection of each first surface normal vector onto the axial end face of the first gasket is fitted into a directed closed loop. The direction of the directed closed loop is the same as the direction of rotation of the threaded connection, and the angle β between the first direction and the axial end face of the first gasket is greater than the lead angle of the threaded connection. The elastic element includes a first elastic portion and a second elastic portion. The first elastic portion and the second elastic portion are alternately arranged and connected to each other along the circumference of the first gasket, so that the elastic element forms a ring shape. The first connecting portion and the second connecting portion are respectively disposed at both ends of the second elastic portion. In its natural state, along the circumferential direction of the first gasket, the first elastic portion and the second elastic portion periodically warp towards the axial direction of the first gasket, the first elastic portion is compressed or recovers along the axial direction of the first gasket, and the second elastic portion is compressed or recovers along the circumferential direction of the first gasket. The natural state is when the first elastic part and the second elastic part are not subjected to any external force. The first side and / or the second side are provided with a receiving cavity along the circumference of the first gasket. The receiving cavity includes a first control area and a second control area. The first control area and the second control area are alternately arranged along the circumference of the first gasket. The first elastic part is disposed in the first control area, and the second elastic part is disposed in the second control area. Wherein, the height of the first control area is less than the height of the first elastic part in its natural state; the height of the second control area is greater than the height of the second elastic part in its natural state.

2. The anti-loosening device for threaded connections according to claim 1, characterized in that, The first anti-loosening structure and the second anti-loosening structure further include a second surface, which is connected to the first surface, and the normal vector of the second surface is tangent to the directed closed loop; the first side and / or the second side are provided with a fixing part along the circumference of the first gasket, and the fixing part is provided corresponding to the first connecting part or the second connecting part; The first connecting portion abuts against the second surface located on the first side, or abuts against the fixing portion located on the first side; The second connecting portion abuts against the second surface located on the second side, or abuts against the fixing portion on the second side.

3. The anti-loosening device for threaded connections according to claim 1, characterized in that, A first receiving portion is provided on the first side, which extends circumferentially along the first gasket. A second receiving portion is provided on the second side, which is provided corresponding to the first receiving portion. The first receiving portion and the second receiving portion are at the same height along the axial direction of the first gasket. The second receiving portion cooperates with the first receiving portion to form the receiving cavity.

4. The anti-loosening device for threaded connections according to claim 1, characterized in that, The number of first surfaces located on the first gasket and the number of first surfaces located on the second gasket are both no less than 5, and the plurality of first surfaces are arranged continuously along the circumference of the first gasket.

5. The anti-loosening device for threaded connections according to claim 1, characterized in that, The angle β formed by the first direction and the axial end face of the first gasket is relative to the coefficient of friction between the first surface of the first anti-loosening structure and the first surface of the second anti-loosening structure. Satisfying the relationship .

6. The anti-loosening device for threaded connections according to claim 1, characterized in that, The first gasket further includes a third side, and the second gasket further includes a fourth side. The third side is disposed opposite to the first side, and the fourth side is disposed opposite to the second side. The third side and the fourth side include contact surfaces. The contact surfaces include a first region and a second region that are alternately disposed along the circumference of the first gasket. The first region is provided with a fixing structure, which is used to fix the first gasket to the threaded connection and / or fix the second gasket to the threaded connection. The surface of the second region is rough. Wherein, the area of ​​the first region is greater than or equal to the area of ​​the second region, or the area of ​​the first region is less than the area of ​​the second region.

7. The anti-loosening device for threaded connections according to claim 6, characterized in that, The fixing structure is a fixing groove, which includes a bottom surface that is inclined in the first direction and extends from the bottom of the fixing groove to the top of the fixing groove.

8. A threaded connection structure, characterized in that, The device includes a nut, a bolt, a first connected component, and an anti-loosening device for threaded connections as described in any one of claims 1-7, wherein the first side abuts against the first connected component, the second side abuts against the nut, the bolt passes sequentially through the first connected component, the first washer, and the second washer, and the nut is connected to the bolt; Alternatively, it may include a screw, a second connected component, and an anti-loosening device for threaded connections as described in any one of claims 1-7, wherein the second connected component is provided with a threaded hole, the first washer and the second washer are provided corresponding to the threaded hole, and the screw is sequentially passed through the second washer, the first washer, and the threaded hole.

Images