Anti-loosening structure, anti-loosening nut and anti-loosening bolt pair
By combining the design of the limiting ring and the elastic protrusion, the problem of aging of the elastic element of the anti-loosening nut is solved, and a stable connection is achieved under vibration and impact conditions, thus improving the anti-loosening effect of the threaded connection.
Patent Information
- Application Number
- CN202520643025.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-08
- Publication Date
- 2026-01-06
- Estimated Expiration
- 2035-04-08
AI Technical Summary
In existing technologies, the elastic elements of anti-loosening nuts are prone to aging, leading to a decline in anti-loosening performance, especially failure under high temperature or long-term use environments.
The structure adopts a limiting ring and multiple elastic protrusions. The limiting ring is coaxially set on one side of the threaded hole, and the protrusions are arranged circumferentially and embedded in the external thread groove to provide multi-directional constraint force and prevent the bolt or screw from loosening.
It enhances the reliability and stability of threaded connections, effectively resists vibration and impact, reduces the risk of component displacement and failure caused by loose bolts or screws, and improves the anti-loosening performance of the connection.
Smart Images
Figure CN223767891U_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of fastener technology, and more specifically, relates to an anti-loosening structure, an anti-loosening nut, and an anti-loosening bolt pair. Background Technology
[0002] Threaded connections are a common type of mechanical connection, primarily achieved through the engagement of internal and external threads. Specifically: the external thread is located on the bolt or screw, while the internal thread is located in the threaded hole of the nut or part; by rotating the bolt or nut, the internal and external threads mesh, generating axial force, thereby fastening two or more parts together.
[0003] To enhance the reliability of threaded connections, existing technologies employ filling the space between internal and external threads with elastic elements (such as nylon rings or spring washers) to increase friction between the threaded pairs, thereby suppressing loosening.
[0004] The inventors discovered that elastic elements are prone to aging or failure under high temperature or long-term use conditions, leading to a decrease in anti-loosening performance. Utility Model Content
[0005] The purpose of this application is to provide an anti-loosening structure, an anti-loosening nut, and an anti-loosening bolt assembly to solve the technical problem that the elastic element in the anti-loosening nut in the prior art is prone to aging, which easily leads to a decrease in anti-loosening performance.
[0006] To achieve the above objectives, the technical solution adopted in this application is as follows:
[0007] A loosening prevention structure is provided, comprising:
[0008] A limiting ring, coaxially mounted on one side of a threaded hole and fixedly connected to the part corresponding to the threaded hole; and
[0009] Multiple protrusions are fixedly disposed on the inner circumferential surface of the limiting ring and are arranged at intervals along the circumferential direction of the limiting ring.
[0010] Each of the protrusions extends toward the central axis of the limiting ring and is made of an elastic material so that when the threaded hole is connected to a bolt or screw, the protrusion can be embedded in the corresponding external thread groove.
[0011] In one possible implementation, each of the protrusions is inclined along the axial direction of the limiting ring.
[0012] In one possible implementation, each of the bumps is tilted in the same direction.
[0013] In this embodiment, when the threaded hole is connected to the bolt or screw, the elastic protrusion is embedded in the external thread groove, increasing the friction between the threaded pairs. Under conditions of vibration and impact, this additional friction can effectively prevent the bolt or screw from loosening, ensuring the stability of the connection and reducing problems such as component displacement and failure caused by bolt loosening; multiple protrusions arranged at intervals along the circumference of the limiting ring constrain the bolt or screw from multiple directions.
[0014] Compared with the prior art, the anti-loosening nut provided in this application embodiment has a multi-directional constraint of multiple protrusions that can better resist the action of external forces in different directions, prevent the bolt or screw from rotating or moving axially, thereby improving the reliability of the connection. This anti-loosening structure can be applied to bolts or screws of different specifications. As long as the threaded hole and the bolt or screw are properly matched, the protrusions can be embedded in the corresponding external thread groove to play an anti-loosening role.
[0015] The technical solution adopted in this application also provides a lock nut, including:
[0016] The main body has a threaded hole extending along the axial direction; and
[0017] One or two sets of anti-loosening structures as described in any one of the preceding descriptions; each of the aforementioned protrusions extends to the inside of the threaded hole;
[0018] Wherein, when there are two sets of anti-loosening structures, the two sets of anti-loosening structures are respectively disposed at both ends of the main body.
[0019] In one possible implementation, when the anti-loosening structure has two sets, the plurality of protrusions corresponding to the two limiting rings are alternately arranged in the circumferential direction of the main body, so that two adjacent protrusions along the circumferential direction of the main body are respectively located on the two limiting rings.
[0020] In one possible implementation, both ends of the main body 1 have mounting grooves for the limiting ring to be inserted.
[0021] In one possible implementation, both ends of the main body also have annular platforms coaxially arranged with the mounting groove, the annular platforms being adapted to abut against the end face of the limiting ring to prevent the limiting ring from disengaging from the mounting groove.
[0022] In one possible implementation, a positioning structure is provided between the limiting ring and the mounting groove, the positioning structure comprising:
[0023] Multiple positioning slots are spaced apart circumferentially on the inner peripheral wall of the limiting ring; and
[0024] Multiple positioning posts are spaced apart on the main body along its circumference and correspond one-to-one with the multiple positioning slots;
[0025] When the limiting ring is embedded in the mounting groove, each positioning post is adapted to be inserted into the corresponding positioning groove.
[0026] In this embodiment, when the anti-loosening nut adopts a set of anti-loosening structures, the protrusions in the anti-loosening structure are embedded in the external thread groove of the bolt, which increases the friction and biting force between the anti-loosening nut and the bolt, effectively resisting the loosening of the nut caused by external forces such as vibration and impact.
[0027] If two sets of anti-loosening structures are used and respectively set at both ends of the main body, both ends of the anti-loosening nut can constrain the bolt, preventing relative rotation and axial movement between the bolt and the anti-loosening nut from two directions, which greatly improves the reliability of anti-loosening. When used in some mechanical equipment with frequent vibration, such as engines and air compressors, it can significantly reduce the risk of nut loosening and ensure the stable operation of the equipment.
[0028] Compared with the prior art, the anti-loosening nut provided in this application embodiment has multiple circumferentially spaced protrusions that apply force to the bolt from different directions, making the force between the anti-loosening nut and the bolt more uniform. This helps to avoid thread damage caused by excessive local force, and can also better cope with the action of external forces in different directions under complex working conditions, further enhancing the anti-loosening effect.
[0029] The technical solution adopted in this application also provides an anti-loosening bolt pair, including the anti-loosening nut described in any one of the preceding descriptions, and a bolt with an external thread groove;
[0030] The external thread groove is adapted to mate with the threaded hole.
[0031] In one possible implementation, the thickness of each of the bumps is less than the pitch of the external thread groove.
[0032] The beneficial effects of the anti-loosening bolt pair provided in this embodiment are the same as those of the aforementioned anti-loosening nut, and will not be repeated here. Attached Figure Description
[0033] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0034] Figure 1 A three-dimensional structural diagram of the anti-loosening nut provided in the embodiments of this application. Figure 1 ;
[0035] Figure 2This is a schematic diagram of the exploded structure of the anti-loosening nut provided in the embodiments of this application;
[0036] Figure 3 for Figure 1 A schematic diagram of the cross-sectional structure of the lock nut shown;
[0037] Figure 4 for Figure 3 A magnified structural diagram of region I in the middle;
[0038] Figure 5 A three-dimensional structural diagram of the anti-loosening nut provided in the embodiments of this application. Figure 2 ;
[0039] Figure 6 for Figure 5 A schematic diagram of the cross-sectional structure of the lock nut shown;
[0040] Figure 7 This is a three-dimensional structural diagram of the anti-loosening bolt pair provided in the embodiments of this application;
[0041] Figure 8 for Figure 7 The diagram shows a cross-sectional view of the anti-loosening bolt assembly.
[0042] Figure 9 for Figure 8 Enlarged structural diagram of region II;
[0043] Figure 10 This is a three-dimensional structural diagram of the limiting ring used in the embodiments of this application;
[0044] Figure 11 for Figure 10 A side view of the limiting ring shown.
[0045] The following are the labeling elements in the figure:
[0046] 1. Limiting ring; 2. Protrusion; 3. Threaded hole; 4. Main body; 41. Mounting groove; 42. Ring platform; 5. Positioning structure; 51. Positioning groove; 52. Positioning post; 6. Bolt. Detailed Implementation
[0047] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.
[0048] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.
[0049] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.
[0050] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.
[0051] Please refer to the following: Figures 1 to 11 The anti-loosening structure, anti-loosening nut, and anti-loosening bolt assembly provided in this application will now be described. The anti-loosening structure includes a limiting ring 1 and multiple protrusions 2.
[0052] The limiting ring 1 is coaxially mounted on one side of the threaded hole 3 and is fixedly connected to the part corresponding to the threaded hole 3.
[0053] Multiple protrusions 2 are fixedly disposed on the inner circumferential surface of the limiting ring 1 and are arranged at intervals along the circumferential direction of the limiting ring 1.
[0054] Each protrusion 2 extends toward the central axis of the limiting ring 1 and is made of elastic material so that when the threaded hole 3 is connected to the bolt 6 or screw, the protrusion 2 can be embedded in the corresponding external thread groove.
[0055] By setting the structure of the limiting ring 1 and the elastic protrusion 2, the above structure can form a multi-directional elastic constraint when the bolt 6 is connected, and achieve the purpose of synchronously limiting the relative displacement of the threaded pair in the axial and radial directions. This achieves the technical effect of maintaining a stable preload under dynamic load, and solves the technical problems of stress relaxation caused by traditional spring washers and thread damage caused by metal inserts.
[0056] In this embodiment, when the threaded hole 3 is connected to the bolt 6 or screw, the elastic protrusion 2 is embedded in the external thread groove, increasing the friction between the threaded pairs. Under conditions of vibration and impact, this additional friction can effectively prevent the bolt 6 or screw from loosening, ensuring the stability of the connection and reducing problems such as component displacement and failure caused by the loosening of the bolt 6; multiple protrusions 2 arranged circumferentially along the limiting ring 1 constrain the bolt 6 or screw from multiple directions.
[0057] Compared with the prior art, the anti-loosening nut provided in this application embodiment has a multi-directional constraint of multiple protrusions 2 that can better resist the action of external forces in different directions, prevent the bolt 6 or screw from rotating or moving axially, thereby improving the reliability of the connection; the anti-loosening structure can be applied to bolts 6 or screws of different specifications. As long as the threaded hole 3 and the bolt 6 or screw have the appropriate fit size, the protrusion 2 can be embedded in the corresponding external thread groove to play the role of anti-loosening.
[0058] In some embodiments, the protrusion 2 described above can be as follows: Figures 1 to 11 The structure shown is described in the following document. Figures 1 to 4 Each protrusion 2 is inclined along the axial direction of the limiting ring 1.
[0059] By setting the axially inclined protrusion 2, the above structure can generate directional frictional resistance during the screwing process, achieving the purpose of directional anti-loosening with low resistance when the bolt 6 is screwed in and doubled resistance when it is screwed out. This achieves a physical effect similar to wedge locking, solving the technical problem that conventional planar contact anti-loosening structures are prone to uniform wear and failure under vibration conditions.
[0060] In some embodiments, the protrusion 2 described above can be as follows: Figures 1 to 11 The structure shown is described in the following document. Figures 1 to 4 Each bump 2 has the same tilt direction.
[0061] By setting the arrangement of protrusions 2 in the same direction, the above structure can form a continuous unidirectional guiding slope, which realizes the purpose of forcibly guiding the motion trajectory of the threaded pair, thereby achieving the technical effect of converting vibration energy into frictional dissipation energy, and solving the technical problem that the anti-loosening structure is prone to reciprocating slippage under multi-directional vibration environment.
[0062] The technical solution adopted in this application also provides an anti-loosening nut, including a main body 4 and one or two sets of anti-loosening structures proposed in any of the above.
[0063] The main body 4 has a threaded hole 3 that runs through the axis.
[0064] One or two sets of anti-loosening structures of any one of the foregoing; each protrusion 2 extends to the inside of the threaded hole 3.
[0065] When there are two sets of anti-loosening structures, the two sets of anti-loosening structures are respectively set at both ends of the main body 4.
[0066] By integrating the anti-loosening structure with the nut body, this structure can superimpose an elastic constraint layer on top of the standard threaded pair, achieving an upgrade in the anti-loosening function of traditional nuts. This allows for the attainment of anti-loosening performance without altering the installation process, solving the technical problem of requiring specialized installation tools for special anti-loosening nuts. The composite constraint field formed by the dual-set configuration more effectively addresses the challenge of long-stroke vibration attenuation.
[0067] In this embodiment of the application, when the anti-loosening nut adopts a set of anti-loosening structures, the protrusion 2 in the anti-loosening structure is embedded in the external thread groove of the bolt 6, which increases the friction and biting force between the anti-loosening nut and the bolt 6, and effectively resists the loosening of the nut caused by external forces such as vibration and impact.
[0068] If two sets of anti-loosening structures are used and respectively set at both ends of the main body 4, both ends of the anti-loosening nut can constrain the bolt 6, preventing relative rotation and axial movement between the bolt 6 and the anti-loosening nut from two directions, which greatly improves the reliability of anti-loosening. When used in some mechanical equipment with frequent vibration, such as engines and air compressors, it can significantly reduce the risk of nut loosening and ensure the stable operation of the equipment.
[0069] Compared with the prior art, the anti-loosening nut provided in this application embodiment has multiple circumferentially spaced protrusions 2 that apply force to the bolt 6 from different directions, making the force between the anti-loosening nut and the bolt 6 more uniform. This helps to avoid thread damage caused by excessive local force, and can also better cope with the action of external forces in different directions under complex working conditions, further enhancing the anti-loosening effect.
[0070] In some embodiments, the aforementioned lock nut can be adopted as follows: Figures 1 to 9 The structure shown is described in the following document. Figures 1 to 9 When the anti-loosening structure has two sets, the multiple protrusions 2 corresponding to the two limiting rings 1 are alternately arranged in the circumference of the main body 4 so that the two adjacent protrusions 2 along the circumference of the main body 4 are respectively on the two limiting rings 1.
[0071] By using the staggered double-group protrusion design, the above structure can form continuous phase difference constraint points in the circumferential direction, thereby achieving the purpose of discretized locking of the rotation angle of the threaded pair. This achieves a technical effect similar to digital anti-loosening and solves the technical problem of coordinated slippage that may occur in continuous inclined surface structures.
[0072] In some embodiments, the aforementioned subject 4 may adopt the following... Figures 2 to 6 The structure shown is described in the following document. Figures 2 to 6 Both ends of the main body 4 have mounting grooves 41 for the insertion of the limiting ring 1.
[0073] Through the embedded design of the mounting slot 41, the above structure enables precise positioning and assembly of the anti-loosening components, ensuring the coaxiality requirement between the limiting ring 1 and the nut body, and solving the technical problem of eccentric loads easily generated in split anti-loosening structures. The dual positioning of the ring platform 42 structure further achieves the technical effect of mechanical interlocking.
[0074] In some embodiments, the aforementioned subject 4 may adopt the following... Figures 1 to 9 The structure shown is described in the following document. Figures 1 to 9 Both ends of the main body 4 also have annular platforms 42 coaxially arranged with the mounting groove 41. The annular platforms 42 are adapted to abut against the end face of the limiting ring 1 to prevent the limiting ring 1 from disengaging from the mounting groove 41.
[0075] The rigid contact between the ring platform 42 and the end face of the limiting ring 1 forms a mechanical stop, which effectively restricts the axial displacement of the limiting ring 1 and prevents the anti-loosening component from falling out of the mounting groove 41 under vibration. Compared with the traditional adhesive or snap-fit fixing method, the axial constraint strength is improved, and the technical problem of creep displacement easily generated by elastic elements after long-term use is solved.
[0076] In some embodiments, the limiting ring 1 and the mounting groove 41 can be adopted as follows: Figures 1 to 11 The structure shown is described in the following document. Figures 1 to 11 The limiting ring 1 and the mounting groove 41 have a positioning structure 5, which includes multiple positioning grooves 51 and multiple positioning posts 52.
[0077] Multiple positioning grooves 51 are arranged at intervals along the circumference of the limiting ring 1 on the inner peripheral wall of the limiting ring 1.
[0078] Multiple positioning posts 52 are spaced apart on the main body 4 along the circumference of the main body 4, and correspond one-to-one with multiple positioning slots 51.
[0079] When the limiting ring 1 is embedded in the mounting groove 41, each positioning post 52 is suitable for insertion into the corresponding positioning groove 51.
[0080] Through the cooperative design of positioning groove 51 and positioning post 52, the above structure can establish a reliable circumferential positioning reference, realize the purpose of maintaining the position of the anti-loosening component under dynamic working conditions, solve the technical problem that the elastic element may cause circumferential slippage leading to constraint failure, and improve the process consistency of product assembly.
[0081] The technical solution adopted in this application also provides an anti-loosening bolt pair, including the anti-loosening nut proposed in any of the foregoing claims, and a bolt 6 with an external thread groove.
[0082] The external thread groove is suitable for connection with the threaded hole 3.
[0083] Through the complete system design of the anti-loosening bolt pair, the above structure constructs an adaptive dynamic anti-loosening system, realizes the synergistic optimization of the overall anti-loosening performance of the connection pair, achieves the technical effect of vibration energy being dissipated in the threaded pair system, and solves the limitation of traditional anti-loosening schemes that only focus on the improvement of single parts.
[0084] In some embodiments, the protrusion 2 described above can be as follows: Figures 1 to 11 The structure shown is described in the following document. Figures 1 to 11 The thickness of each bump 2 is less than the pitch of the external thread groove, and each bump 2 can be embedded in the external thread groove.
[0085] By limiting the dimensional relationship between the thickness of the protrusion 2 and the pitch, the above structure can ensure that the elastic deformation is controlled within the allowable range of thread engagement, achieving a balance between anti-loosening function and assembly smoothness, achieving the technical effect of not changing the fit characteristics of the standard thread pair, and solving the technical problem of thread damage caused by interference fit.
[0086] The anti-loosening bolt pair proposed in this application has the following advantages compared with the prior art:
[0087] Dynamic anti-loosening: The elastic protrusion 2 is embedded in the threaded groove to form a multi-directional elastic constraint. Under vibration conditions, it maintains the preload through continuous deformation, solving the problem of easy failure of traditional rigid anti-loosening structures.
[0088] Directional locking: The axially inclined protrusion 2 generates a wedge effect, resulting in low screwing resistance and doubled screwing resistance, significantly improving the anti-loosening effect compared to standard nuts;
[0089] High compatibility: The thickness of bump 2 is adapted to the standard pitch, and it can directly replace the conventional nut without changing the structure of bolt 6, reducing maintenance costs;
[0090] Long-term stability: The positioning groove 51 column eliminates circumferential slippage and improves the service life of the anti-loosening bolt pair.
[0091] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. Anti-loosening structure, characterized by, The application relates to a locking nut, which comprises: a limiting ring (1) arranged coaxially on one side of a threaded hole (3) and fixedly connected with a part corresponding to the threaded hole (3); and a plurality of protrusions (2) fixedly arranged on the inner circumferential surface of the limiting ring (1) and arranged in a circumferential direction of the limiting ring (1) at intervals. Each protrusion (2) extends towards the central axis of the limiting ring (1) and is made of elastic material, so that the protrusion (2) can be embedded in a corresponding external thread groove when the threaded hole (3) is connected with a bolt (6) or a screw rod.
2. The anti-loosening structure according to claim 1, wherein Each protrusion (2) is arranged in an axial direction of the limiting ring (1) at an angle.
3. The anti -loose structure according to claim 2, characterized in that, The angle directions of the protrusions (2) are the same.
4. A lock nut characterised in that, The application relates to a locking nut, which comprises: a main body (4) provided with a threaded hole (3) penetrating in an axial direction; and one or two sets of the locking structure as claimed in any one of claims 1-3; each protrusion (2) extends to the inner side of the threaded hole (3); When the locking structure has two sets, the two sets of locking structures are arranged at two ends of the main body (4) respectively.
5. The lock nut of claim 4 wherein, When the locking structure has two sets, the protrusions (2) corresponding to the two limiting rings (1) are arranged alternately in a circumferential direction of the main body (4), so that two protrusions (2) adjacent in the circumferential direction of the main body (4) are arranged on the two limiting rings (1) respectively.
6. The lock nut of claim 4 wherein: Each end of the main body (4) is provided with a mounting groove (41) for embedding the limiting ring (1).
7. The lock nut of claim 6 wherein, Each end of the main body (4) is further provided with a ring table (42) arranged coaxially with the mounting groove (41), and the ring table (42) is adapted to abut against the end surface of the limiting ring (1) to limit the limiting ring (1) from being separated from the mounting groove (41).
8. The lock nut of claim 6 wherein, The limiting ring (1) and the mounting groove (41) are provided with a positioning structure (5), which comprises: a plurality of positioning grooves (51) arranged at intervals in a circumferential direction of the limiting ring (1) on the inner circumferential wall of the limiting ring (1); and a plurality of positioning columns (52) arranged at intervals in a circumferential direction of the main body (4) on the main body (4) and corresponding to the plurality of positioning grooves (51) one by one; When the limiting ring (1) is embedded in the mounting groove (41), each positioning column (52) is adapted to be inserted into the corresponding positioning groove (51).
9. A locking bolt pair, characterized in that The application further relates to a locking nut as claimed in any one of claims 4-8 and a bolt (6) provided with an external thread groove. The external thread groove is adapted to be connected with the threaded hole (3).
10. The captive bolt set of claim 9, wherein, The thickness of each protrusion (2) is smaller than the pitch of the external thread groove.