Anti-loosening bolt and nut assembly

Abstract

The utility model discloses an anti-loosening bolt and nut assembly, which relates to the technical field of anti-loosening fasteners and comprises a double-thread bolt, a locking nut, a retaining nut and a limiting sleeve. The double-thread bolt is provided with a thread section, and the thread section is provided with a locking thread and a retaining thread which are opposite in thread screwing direction; the locking nut is used for being in threaded connection with the locking thread; the retaining nut is used for being in threaded connection with the retaining thread; the retaining nut is located at the end, away from the bolt head of the double-thread bolt, of the locking nut. One end, close to the locking nut, of the retaining nut is extruded at the corresponding end part of the locking nut; the outer side wall of the locking nut and the outer side wall of the retaining nut are provided with the same limiting face. The retaining nut and the locking nut are sleeved with the limiting sleeve, and the inner side wall of the limiting sleeve can correspond to the limiting face of the locking nut and the limiting face of the retaining nut. The anti-loosening effect is improved, and the connection stability and safety are guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of anti-loosening fasteners, in particular to an anti-loosening bolt and nut assembly. Background Art

[0002] Traditional threaded connections use nuts plus washers or spring washers connected to bolts, or use double nut structures, but these structures are not very reliable, and the current bolt-nut connection structures often rely only on the threaded connection between the nut and the bolt to prevent slipping and loosening, which only has one layer of protection and is easy to loosen. When such structures are subjected to impact, vibration, especially dynamic loads in the form of axial cycles, the preload force of the threaded connection is likely to gradually decrease, eventually causing connection failures in the form of loosening, falling off, and falling off, which poses a great safety hazard. Utility Model Content

[0003] The utility model aims to provide an anti-loosening bolt and nut assembly to solve the problems existing in the above-mentioned prior art, improve the anti-loosening effect, and ensure the connection stability and safety.

[0004] To achieve the above purpose, the utility model provides the following solutions:

[0005] The utility model provides an anti-loosening bolt and nut assembly, comprising a double-threaded bolt, a locking nut, a stop nut and a limiting sleeve; the double-threaded bolt has a threaded section, and the threaded section has a locking thread and a stop thread with opposite thread rotation directions; the locking nut is used to be threadedly connected to the locking thread; the stop nut is used to be threadedly connected to the stop thread; the stop nut is located at an end of the locking nut away from the bolt head of the double-threaded bolt; an end of the stop nut close to the locking nut is squeezed at the end corresponding to the locking nut; the outer side walls of the locking nut and the stop nut have the same limiting surface; the limiting sleeve is sleeved on the stop nut and the locking nut, and the inner side wall of the limiting sleeve and the limiting surfaces of the locking nut and the stop nut can correspond to each other.

[0006] Preferably, the threaded section includes a locking section and a stop section; the stop section is located at an end of the locking section away from the bolt head of the double-threaded bolt; the locking thread is provided on the locking section; the stop thread is provided on the stop section; the outer diameter of the locking section is larger than the outer diameter of the stop section; in the axial direction of the double-threaded bolt, after the locking nut is threadedly connected to the locking thread, one end of the locking nut close to the stop nut is located on the stop section.

[0007] Preferably, it further includes at least one locking member; at least one mounting hole is provided on the outer side wall of the locking nut, and at least one limiting hole is provided on the limiting sleeve; each of the limiting holes corresponds to one of the mounting holes; the locking member is disposed in one of the limiting holes and one of the mounting holes.

[0008] Preferably, the anti-back-off nut includes an outer ring and an inner anti-back-off ring arranged coaxially; an anti-back-off internal thread for threadedly connecting with the anti-back-off thread is provided on the circumferential inner side wall of the inner anti-back-off ring; a first engaging tooth is fixedly provided on the circumferential outer side wall of the inner anti-back-off ring, and a second engaging tooth is fixedly provided on the circumferential inner side wall of the outer ring, and the first engaging tooth and the second engaging tooth are engaged with each other.

[0009] Preferably, the outer ring is fixedly connected to the limiting sleeve.

[0010] Preferably, the locking member has a telescopic end; the locking member is used to be disposed in one of the mounting holes, and the telescopic end can protrude from the outer side wall of the locking nut and be located in one of the mounting holes, or the telescopic end can not protrude from the outer side wall of the locking nut.

[0011] Preferably, the locking member includes an elastic element, a thrust base, a guide rail sleeve, and a telescopic button coaxially arranged; the elastic element is located in the mounting hole, and one end of the thrust base abuts against one end of the elastic element away from the axis of the locking nut; four first convex ribs are circumferentially and fixedly arranged on the thrust base around its axis, and inclined teeth are arranged at one end of each first convex rib away from the elastic element; the inclined directions of the inclined teeth are the same; one end of the telescopic button is provided with a serrated edge, and eight pushing columns are circumferentially and fixedly arranged on the outer side wall of this end of the telescopic button; the guide rail sleeve is used to be fixed in the mounting hole, four pop-up chutes penetrating inside and outside are opened on the outer side wall of the guide rail sleeve, and a guide chute is arranged between two adjacent pop-up chutes on the inner side wall of the guide rail sleeve; each of the pop-up chutes and each of the guide chutes respectively corresponds to one of the pushing columns, and each of the pushing columns can reciprocate along the axis of the guide rail sleeve in the pop-up chute or the guide chute; at one end of the guide rail sleeve close to the locking nut and between two adjacent pop-up chutes, a contraction chute and a connecting inclined surface are arranged; one end of the contraction chute is communicated with one of the pop-up chutes, and the other end of the contraction chute is connected to the connecting inclined surface, and the other end of the connecting inclined surface is communicated with the other pop-up chute; when the inclined teeth are located in the pop-up chute, one end of the telescopic button away from the elastic element can protrude from the outer side wall of the locking nut; when the inclined teeth are located in the contraction chute, one end of the telescopic button away from the elastic element can be kept from protruding from the outer side wall of the locking nut; in the axial direction of the guide rail sleeve, after moving the telescopic button in the direction close to the elastic element, the pushing column located in the pop-up chute can push the corresponding inclined tooth on the thrust base out of the pop-up chute; and after the inclined tooth can be disengaged, it is located in the corresponding contraction chute; after continuing to move the telescopic button in the direction close to the elastic element, the pushing column located in the guide chute can push the inclined tooth located in the contraction chute onto the connecting inclined surface, and the inclined tooth falling on the connecting inclined surface can fall into the next pop-up chute through the guiding of the corresponding connecting inclined surface.

[0012] Preferably, the elastic element is a spring.

[0013] Preferably, a rotation driving surface is arranged on the outer side wall of the limiting sleeve.

[0014] Preferably, the rotation driving surface corresponds to the limiting surface on the outer side wall of the locking nut one by one.

[0015] The present utility model has achieved the following technical effects compared with the prior art:

[0016] The anti-loosening bolt and nut assembly provided by the present utility model realizes the thread fastening with a double-thread bolt by using a locking nut, and a check nut with a thread direction opposite to that of the locking nut is threadedly abutted against the rear end of the locking nut. Since their thread directions are opposite, the first-level anti-loosening of the locking nut is achieved. In cooperation with a limiting sleeve, the locking nut and the check nut are restricted together, increasing the anti-loosening of their relative rotation, that is, the second-level anti-loosening. The double anti-loosening improves the anti-loosening effect and ensures the connection stability and safety.

[0017] Further, one section is set as a locking section and the other section is set as a check section. Their outer diameters are different, and they are matched with corresponding locking nuts and check nuts. The structure is simple and the processing is convenient, which can reduce the processing cost.

[0018] Further, the locking member can achieve the anti-dropping and anti-disengagement effects of the limiting sleeve in the axial direction, increasing the circumferential relative rotational movement between the locking nut and the check nut, and improving the anti-loosening effect.

[0019] Further, the check nut is composed of an outer ring and an inner check ring. When the check nut needs to be tightened, it can be achieved by rotating the outer ring through the mutual engagement of the first engagement teeth and the second engagement teeth between the outer ring and the inner check ring. After the tightening operation is completed, the outer ring can be disengaged from the inner check ring, and the outer ring can be circumferentially rotated relative to the inner check ring so that the outer shape of the outer ring corresponds more precisely to the outer shape of the locking nut, so that the limiting sleeve can simultaneously complete the sleeving installation of both.

[0020] Further, the outer ring and the limiting sleeve are fixedly connected together. It can reduce the number of parts, reduce the risk of loss and shortage, and can also reduce the number of processing times and the processing cost.

[0021] Further, the locking member is directly arranged in the installation hole, and the limiting connection between the limiting sleeve and the locking nut is realized through the telescopic movement of its telescopic end. The structure is simple and the operation is convenient.

[0022] Further, the locking member is composed of an elastic element, a thrust base, a guide rail sleeve and a telescopic button. It adopts a pressing structure similar to that of a ballpoint pen, so as to realize its stable pressing and telescoping. The structure is common and convenient for processing and manufacturing.

[0023] Further, the elastic element is a spring, and its components are common and easy to obtain.

[0024] Further, the rotation driving surface on the limiting sleeve can, with the cooperation of a tool, realize the tightening of the inner check ring through reverse cooperation, and can realize the circumferential locking of the inner check ring and the locking nut through forward placement.

[0025] Further, the rotation driving surfaces correspond to the limiting surfaces of the locking nuts one by one, which facilitates the one-to-one correspondence between the corresponding surfaces of the limiting sleeve and the locking nuts. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0027] Figure 1 FIG. is a schematic diagram of the overall structure of the anti-loosening bolt and nut assembly provided by the present invention;

[0028] Figure 2 FIG. is a schematic cross-sectional structure diagram of the anti-loosening bolt and nut assembly provided by the present invention;

[0029] Figure 3 FIG. is an exploded view of the structure of the anti-loosening bolt and nut assembly provided by the present invention;

[0030] Figure 4 FIG. is an exploded view of the structure of the locking member in the anti-loosening bolt and nut assembly provided by the present invention;

[0031] Figure 5 FIG. is a schematic diagram of the structure of the locking member in the anti-loosening bolt and nut assembly provided by the present invention in the retracted state;

[0032] Figure 6 FIG. is a schematic diagram of the structure of the locking member in the anti-loosening bolt and nut assembly provided by the present invention in the extended state.

[0033] In the figure:

[0034] 100 - anti-loosening bolt and nut assembly;

[0035] 10 - double-threaded bolt; 11 - bolt head; 12 - locking section; 13 - anti-back-off section;

[0036] 20 - locking nut; 21 - mounting hole;

[0037] 30 - anti-back-off nut; 31 - outer ring; 311 - second meshing tooth; 32 - inner anti-back-off ring; 321 - first meshing tooth;

[0038] 40 - limiting sleeve; 41 - limiting hole; 42 - rotation driving surface;

[0039] 50 - Locking member; 51 - Elastic element; 52 - Thrust base; 521 - First convex rib; 522 - Inclined tooth; 53 - Guide rail sleeve; 531 - Ejection chute; 532 - Guide chute; 533 - Contraction chute; 534 - Connecting inclined surface; 54 - Telescopic button; 541 - Serrated edge; 542 - Pushing column. Detailed implementation mode

[0040] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0041] The purpose of the present invention is to provide a loosening - proof bolt - nut assembly to solve the problems existing in the prior art, improve the loosening - proof effect, and ensure the connection stability and safety.

[0042] To make the above - mentioned objects, features and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific implementation modes.

[0043] Embodiment 1

[0044] This embodiment provides a loosening - proof bolt - nut assembly 100, as Figures 1 to 6 shown, including a double - threaded bolt 10, a locking nut 20, a check nut 30 and a limiting sleeve 40; the double - threaded bolt 10 has a threaded section, and the threaded section has locking threads and check threads with opposite thread directions; the locking nut 20 is used for threaded connection with the locking threads; the check nut 30 is used for threaded connection with the check threads; the check nut 30 is located at one end of the locking nut 20 away from the bolt head 11 of the double - threaded bolt 10; one end of the check nut 30 close to the locking nut 20 is pressed against the corresponding end of the locking nut 20; the outer side walls of the locking nut 20 and the check nut 30 have the same limiting surface; the limiting sleeve 40 is sleeved on the check nut 30 and the locking nut 20, and the inner side wall of the limiting sleeve 40 can correspond to the limiting surfaces of both the locking nut 20 and the check nut 30.

[0045] By using the locking nut 20 to achieve threaded fastening with the double - threaded bolt 10, and using the check nut 30 with the opposite thread direction to thread - abut against the rear end of the locking nut 20, with opposite thread directions for the two, the first - level loosening prevention of the locking nut 20 is realized; and in cooperation with the limiting sleeve 40, the locking nut 20 and the check nut 30 are restricted together, increasing the loosening prevention of their relative rotation, that is, the second - level loosening prevention; double loosening prevention improves the loosening - proof effect and ensures the connection stability and safety.

[0046] Among them, the related structural description of the double-threaded bolt 10 is as follows:

[0047] In an alternative solution of this embodiment, preferably, as Figures 1 to 3 shown, the threaded section includes a locking section 12 and an anti-loosening section 13; the anti-loosening section 13 is located at one end of the locking section 12 away from the bolt head 11 of the double-threaded bolt 10; locking threads are provided on the locking section 12; anti-loosening threads are provided on the anti-loosening section 13; the outer diameter of the locking section 12 is larger than the outer diameter of the anti-loosening section 13 (to facilitate the locking nut 20 to pass through the anti-loosening section 13); in the axial direction of the double-threaded bolt 10, after the locking nut 20 is threadedly connected to the locking threads, one end of the locking nut 20 close to the anti-loosening nut 30 is located on the anti-loosening section 13 (this setting can save a gasket). By setting one section as the locking section 12 and one section as the anti-loosening section 13, with different outer diameters, and cooperating with the corresponding locking nut 20 and anti-loosening nut 30, the structure is simple, the processing is convenient, and the processing cost can be reduced.

[0048] Among them, the related structural description of the locking nut 20 is as follows:

[0049] In an alternative solution of this embodiment, preferably, as Figures 1 to 6 shown, it further includes at least one locking member 50; at least one mounting hole 21 is provided on the outer side wall of the locking nut 20, and at least one limiting hole 41 is provided on the limiting sleeve 40; each limiting hole 41 corresponds to the mounting hole 21 one by one; the locking member 50 is arranged in one limiting hole 41 and one mounting hole 21. The locking member 50 can achieve the effect of preventing the limiting sleeve 40 from falling off and disengaging in the axial direction, increasing the circumferential relative rotational movement between the locking nut 20 and the anti-loosening nut 30, and improving the anti-loosening effect.

[0050] Specifically, the locking member 50 can be a shaft pin, which can be correspondingly inserted and fixed in one mounting hole 21 and one limiting hole 41; it can also be a structural member with a telescopic end; it can also be as Figures 4 to 6 shown, a structural composition that realizes telescoping by pressing.

[0051] In an alternative solution of this embodiment, preferably, Figures 1 to 6 shown, the locking member 50 has a telescopic end that can be telescoped; the locking member 50 is used to be arranged in one mounting hole 21, and the telescopic end can protrude from the outer side wall of the locking nut 20 and be located in one mounting hole 21, or the telescopic end can not protrude from the outer side wall of the locking nut 20. The locking member 50 is directly arranged in the mounting hole 21, and the limiting connection between the limiting sleeve 40 and the locking nut 20 is realized through the telescopic movement of its telescopic end, with a simple structure and convenient operation.

[0052] In an alternative solution of this embodiment, preferably, as Figures 4 to 6As shown, the locking member 50 includes an elastic element 51, a thrust base 52, a guide rail sleeve 53, and a telescopic button 54 that are coaxially arranged; the elastic element 51 is located in the mounting hole 21, and one end of the thrust base 52 abuts against one end of the elastic element 51 away from the axis of the locking nut 20; four first convex ribs 521 are circumferentially and fixedly arranged on the thrust base 52 around its axis, and a bevel gear 522 is arranged at one end of each first convex rib 521 away from the elastic element 51; the bevels of the bevel gears 522 are arranged in the same direction; a serrated edge 541 is arranged at one end of the telescopic button 54, and eight push columns 542 are circumferentially and fixedly arranged on the outer side wall of this end of the telescopic button 54; the guide rail sleeve 53 is used to be fixed in the mounting hole 21, and four pop-up chutes 531 penetrating inside and outside are opened on the outer side wall of the guide rail sleeve 53, and a guide chute 532 is arranged between two adjacent pop-up chutes 531 on the inner side wall of the guide rail sleeve 53; each pop-up chute 531 and each guide chute 532 respectively correspond to a push column 542 one by one, and each push column 542 can reciprocally slide along the axis of the guide rail sleeve 53 in the pop-up chute 531 or the guide chute 532; at one end of the guide rail sleeve 53 close to the locking nut 20 and between two adjacent pop-up chutes 531, a contraction chute 533 and a connecting bevel 534 are arranged; one end of the contraction chute 533 is communicated with a pop-up chute 531, and the other end of the contraction chute 533 is connected to the connecting bevel 534, and the other end of the connecting bevel 534 is communicated with another pop-up chute 531; when the bevel gear 522 is located in the pop-up chute 531, one end of the telescopic button 54 away from the elastic element 51 can protrude from the outer side wall of the locking nut 20; when the bevel gear 522 is located in the contraction chute 533, one end of the telescopic button 54 away from the elastic element 51 can remain not protruding from the outer side wall of the locking nut 20; in the axial direction of the guide rail sleeve 53, after the telescopic button 54 is moved in the direction close to the elastic element 51, the push column 542 located in the pop-up chute 531 can push the corresponding bevel gear 522 on the thrust base 52 out of the pop-up chute 531; and after the bevel gear 522 can be disengaged, it is located in the corresponding contraction chute 533; after the telescopic button 54 is continuously moved in the direction close to the elastic element 51, the push column 542 located in the guide chute 532 can push the bevel gear 522 located in the contraction chute 533 onto the connecting bevel 534, and the bevel gear 522 falling on the connecting bevel 534 can fall into the next pop-up chute 531 through the guidance of the corresponding connecting bevel 534. The locking member 50 is composed of an elastic element 51, a thrust base 52, a guide rail sleeve 53, and a telescopic button 54, and it adopts a pressing structure similar to that of a ballpoint pen, so as to realize its stable pressing and telescoping. Its structure is common and convenient for processing and manufacturing.

[0053] In an alternative embodiment of the present embodiment, preferably, as Figures 4 to 6 shown, the elastic element 51 is a spring. The elastic element 51 adopts a spring, and its components are common and easy to obtain.

[0054] Among them, the related structure description of the anti-back-off nut 30:

[0055] In an alternative solution of this embodiment, preferably, as Figures 2 to 3 shown, the anti-back-off nut 30 includes an outer ring 31 and an inner anti-back-off ring 32 arranged coaxially; an anti-back-off internal thread that is threadedly connected to the anti-back-off thread is provided on the circumferential inner side wall of the inner anti-back-off ring 32; a first engaging tooth 321 is fixedly provided on the circumferential outer side wall of the inner anti-back-off ring 32, and a second engaging tooth 311 is fixedly provided on the circumferential inner side wall of the outer ring 31, and the first engaging tooth 321 and the second engaging tooth 311 are engaged with each other. The anti-back-off nut 30 is composed of two parts, namely the outer ring 31 and the inner anti-back-off ring 32. When it is necessary to tighten the anti-back-off nut 30, by the mutual engagement of the first engaging tooth 321 and the second engaging tooth 311 between the outer ring 31 and the inner anti-back-off ring 32, rotating the outer ring 31 can be achieved; after the tightening operation is completed, the outer ring 31 can be disengaged from the inner anti-back-off ring 32, and the outer ring 31 can be circumferentially rotated and adjusted relative to the inner anti-back-off ring 32, so that the outer shape of the outer ring 31 corresponds more precisely to the outer shape of the locking nut 20, so that the limiting sleeve 40 can simultaneously complete the sleeving installation of both.

[0056] Among them, the related structure description of the limiting sleeve 40:

[0057] In an alternative solution of this embodiment, preferably, as Figures 1 to 3 shown, the outer ring 31 is fixedly connected to the limiting sleeve 40. The outer ring 31 and the limiting sleeve 40 are fixedly connected together, which can reduce the number of components, reduce the risk of loss and shortage, and can also reduce the number of processing times and processing costs.

[0058] In an alternative solution of this embodiment, preferably, as Figure 1 shown, a rotation driving surface 42 is provided on the outer side wall of the limiting sleeve 40. The rotation driving surface 42 on the limiting sleeve 40 can, with the cooperation of a tool, achieve the tightening of the inner anti-back-off ring 32 through reverse cooperation, and can achieve the circumferential locking of the inner anti-back-off ring 32 and the locking nut 20 through forward placement.

[0059] In an alternative solution of this embodiment, preferably, the rotation driving surface 42 corresponds one-to-one to the limiting surface on the outer side wall of the locking nut 20. The rotation driving surface 42 corresponds one-to-one to the limiting surface of the locking nut 20, which can facilitate the one-to-one correspondence of the corresponding surfaces of the limiting sleeve 40 and the locking nut 20.

[0060] Among them, the related other descriptions:

[0061] Specifically, the implementation method is as follows: When using the double-threaded bolt 10 for fastening, first apply the torque to the locking nut 20. Then, invert the component formed by combining the limit sleeve 40 and the outer ring 30, and make it engage with each tooth of the inner anti-backlash ring 32. By rotating the limit sleeve 40, the torque of the inner anti-backlash ring 32 is tightened. Apply the anti-backlash nut 30 with a fastening torque close to or equal to that of the locking nut 20. After applying the torque, install it upright. By circumferentially rotating the limit sleeve 40, align the limit hole on the limit sleeve 40 with the position of the locking member 50 on the locking nut, so that the limit sleeve 40 is sleeved on the inner anti-backlash ring 32 and the locking nut 20. The second engaging teeth 311 on the outer ring 31 of the limit sleeve 40 engage with the first engaging teeth 321 on the inner anti-backlash ring 32. Press and pop out the telescopic button 54 of the locking member 50 so that it is located in the limit hole 41 of the limit sleeve 40.

[0062] In the present utility model, specific examples are used to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model; at the same time, for those of ordinary skill in the art, according to the idea of the present utility model, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present utility model.

Claims

1. An anti-loosening bolt and nut assembly, characterized in that: It includes a double-thread bolt, a locking nut, a stop nut and a limiting sleeve; The double-thread bolt has a threaded section, and the threaded section has a locking thread and a stop thread with opposite thread rotation directions; The locking nut is used for threaded connection with the locking thread; The stop nut is used for threaded connection with the stop thread; The stop nut is located at an end of the locking nut away from the bolt head of the double-threaded bolt; One end of the stop nut close to the locking nut is pressed against the end corresponding to the locking nut; The outer side walls of the locking nut and the stop nut have the same limiting surface; The limiting sleeve is sleeved on the stop nut and the locking nut, and the inner side wall of the limiting sleeve and the limiting surfaces of the locking nut and the stop nut can correspond to each other.

2. The anti-loosening bolt and nut assembly according to claim 1, characterized in that: The threaded section includes a locking section and a stop section; The stop section is located at an end of the locking section away from the bolt head of the double-threaded bolt; The locking section is provided with the locking thread; The stop section is provided with the stop thread; The outer diameter of the locking section is greater than the outer diameter of the stop section; In the axial direction of the double-thread bolt, after the locking nut is threadedly connected to the locking thread, one end of the locking nut close to the stop nut is located on the stop section.

3. The anti-loosening bolt and nut assembly according to claim 1, characterized in that: Also includes at least one locking member; At least one mounting hole is provided on the outer side wall of the locking nut, and at least one limiting hole is provided on the limiting sleeve; each limiting hole corresponds to the mounting hole one by one; The locking member is arranged in one of the limiting holes and one of the mounting holes.

4. The anti-loosening bolt and nut assembly according to claim 3, characterized in that: The stop nut comprises an outer ring and an inner stop ring which are coaxially arranged; The inner circumferential inner side wall of the inner stop ring is provided with an inner stop thread which is threadably connected to the stop thread; A first meshing tooth is fixedly provided on the circumferential outer wall of the inner stop ring, and a second meshing tooth is fixedly provided on the circumferential inner wall of the outer ring, and the first meshing tooth and the second meshing tooth are meshed with each other.

5. The anti-loosening bolt and nut assembly according to claim 4, characterized in that: The outer ring is fixedly connected to the limiting sleeve.

6. The anti-loosening bolt and nut assembly according to claim 3, characterized in that: The locking member has a telescopic end capable of being telescopic; The locking member is used to be arranged in one of the mounting holes, and the telescopic end can protrude from the outer side wall of the locking nut and be located in one of the mounting holes, or the telescopic end can not protrude from the outer side wall of the locking nut.

7. The anti-loosening bolt and nut assembly according to claim 6, characterized in that: The locking member comprises a coaxially arranged elastic element, a thrust base, a guide rail sleeve and a telescopic button; The elastic element is located in the mounting hole, and one end of the thrust base abuts against an end of the elastic element away from the axis of the locking nut; The thrust base is circumferentially fixed with four first ridges around its axis, and each of the first ridges is provided with a bevel tooth at one end away from the elastic element; the bevel teeth are arranged in the same oblique direction; One end of the telescopic button is provided with a serrated edge, and eight push posts are fixedly provided circumferentially on the outer side wall of the end of the telescopic button; The guide rail sleeve is used to be fixed in the mounting hole, and four pop-up slide grooves penetrating inside and outside are provided on the outer wall of the guide rail sleeve, and a guide slide groove is provided between two adjacent pop-up slide grooves on the inner wall of the guide rail sleeve; each pop-up slide groove and each guide slide groove respectively correspond to the push column, and each push column can reciprocate in the pop-up slide groove or the guide slide groove along the axis of the guide rail sleeve; The guide rail sleeve is provided with a contraction slide groove and a connection slope at one end close to the locking nut and between two adjacent pop-up slide grooves; One end of the contraction chute is connected to one of the pop-up chute, and the other end of the contraction chute is connected to the connecting slope, and the other end of the connecting slope is connected to another of the pop-up chute; When the beveled teeth are located in the ejection slot, the end of the telescopic button away from the elastic element can protrude from the outer side wall of the locking nut; when the beveled teeth are located in the contraction slot, the end of the telescopic button away from the elastic element can remain not protruding from the outer side wall of the locking nut; After the telescopic button is moved toward the elastic element in the axial direction of the guide rail sleeve, the pushing column located in the pop-up slot can push the corresponding beveled tooth on the thrust base out of the pop-up slot; and the beveled tooth can be located in the corresponding contraction slot after being out; after the telescopic button is continued to be moved toward the elastic element, the pushing column located in the guide slot can push the beveled tooth in the contraction slot onto the connecting bevel, and the beveled tooth that falls on the connecting bevel can fall into the next pop-up slot through the guidance of the corresponding connecting bevel.

8. The anti-loosening bolt and nut assembly according to claim 7, characterized in that: The elastic element is a spring.

9. The anti-loosening bolt and nut assembly according to claim 5, characterized in that: A rotation driving surface is arranged on the outer side wall of the limiting sleeve.

10. The anti-loosening bolt and nut assembly according to claim 9, characterized in that: The rotation driving surface corresponds one to one with the limiting surface on the outer side wall of the locking nut.

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