Long-acting lock nut and lock bolt

Abstract

The long-acting locknut comprises a nut body, the nut body is provided with a screw hole, the screw hole at least comprises a first screw hole section and a second screw hole section in the length direction, and the central axis of the first screw hole section and the central axis of the second screw hole section are eccentrically arranged. The internal thread of the first screw hole section and the internal thread of the second screw hole section are in continuous transition; the bolt body is provided with a bolt head and a stud arranged on the bolt head, the stud at least comprises a first stud section and a second stud section in the length direction, the central axis of the first stud section and the central axis of the second stud section are eccentrically arranged, and an external thread of the first stud section and an external thread of the second stud section are in continuous transition; the design is not prone to clamping rotation, convenient and stable to use and firm in connection.

Description

Technical Field

[0001] This utility model relates to the field of connecting accessories technology, and in particular to a long-lasting anti-loosening nut and anti-loosening bolt. Background Technology

[0002] Anti-loosening nut assemblies can effectively prevent loosening during the connection process. Their strong connection characteristics are recognized by users and therefore they are widely used in infrastructure, aerospace and other fields.

[0003] Traditional anti-loosening nut assemblies typically require at least a first nut and a second nut. After both the first and second nuts are connected to the bolt, the eccentric structure between them creates radial resistance. The threads of both the first and second nuts can tightly press against the threads of the stud, preventing loosening. However, during assembly, the cooperation of the first and second nuts is required to achieve the anti-loosening effect. Firstly, the production cost of two nuts is relatively high, and secondly, some narrow spaces are not convenient for installing two nuts.

[0004] Therefore, some manufacturers are considering how to achieve an anti-loosening effect on a single nut. One existing anti-loosening nut involves tapping both ends of a through hole to create a first and second thread that are not concentric. When the bolt is connected to the first and second threads respectively, an anti-loosening effect can be achieved. However, because this anti-loosening nut is formed by tapping the first and second threads, a relief groove must be bored between them. This structure not only weakens the nut's mechanical properties but also creates a stepped portion with varying degrees of eccentricity at the ends of the first and second threads that are close to each other. If the eccentricity is not large enough, the nut cannot achieve the anti-loosening effect; if the eccentricity is large enough, it will prevent the stud from being screwed further into the second threaded hole. During use, users often find that after screwing the bolt into the first or second thread, they cannot screw it into the second or first thread again, resulting in poor performance and failing to meet user needs. Utility Model Content

[0005] This utility model aims to solve at least one of the technical problems existing in the prior art. To this end, this utility model proposes a long-lasting anti-loosening nut and anti-loosening bolt, which provides a firm connection and is convenient and stable to use.

[0006] According to a first aspect of the present invention, a long-lasting anti-loosening nut includes a nut body with a threaded hole. The threaded hole includes at least a first threaded hole segment and a second threaded hole segment along its length. The central axis of the first threaded hole segment and the central axis of the second threaded hole segment are eccentrically arranged, and the internal threads of the first threaded hole segment and the second threaded hole segment are continuously transitioned.

[0007] A long-lasting anti-loosening nut according to an embodiment of the present utility model has at least the following beneficial effects:

[0008] This utility model of a long-lasting anti-loosening nut, when the nut body is connected to a bolt, due to the eccentric setting of the central axis of the first threaded hole section and the central axis of the second threaded hole section, the threads of the first threaded hole section and the second threaded hole section cooperate with each other to form radial compression on the bolt, thereby achieving the purpose of anti-loosening. Furthermore, the internal threads of the first threaded hole section and the second threaded hole section are continuously transitioned, so after the bolt is screwed into the first threaded hole section, it can smoothly enter the second threaded hole section from the tail end of the first threaded hole section, making it less prone to jamming. It is convenient and stable to use, and the connection is firm.

[0009] According to some embodiments of the present invention, the central axis of the first screw hole segment and the central axis of the second screw hole segment have an inclination angle so that the central axis of the first screw hole segment and the central axis of the second screw hole segment are eccentrically set.

[0010] According to some embodiments of this utility model, the tilt angle is less than 45°.

[0011] According to some embodiments of the present invention, the central axis of the first screw hole segment and the central axis of the second screw hole segment are radially spaced, and a transition hole segment is provided between the first screw hole segment and the second screw hole segment. One end of the transition hole segment is connected to the first screw hole segment, and the other end of the transition hole segment is connected to the second screw hole segment. The internal threads of the first screw hole segment and the internal threads of the second screw hole segment are continuously connected to the inner wall of the transition hole segment.

[0012] According to some embodiments of this utility model, when the anti-loosening nut is assembled on the mating bolt, the stud of the mating bolt passes through the first threaded hole section and the second threaded hole section in sequence, wherein the stud of the mating bolt and the first threaded hole section are concentrically arranged.

[0013] According to a second aspect of the present invention, an anti-loosening bolt includes a bolt body, a bolt head and a stud disposed on the bolt head, the stud comprising at least a first stud segment and a second stud segment along its length, wherein the central axis of the first stud segment and the central axis of the second stud segment are eccentrically disposed, and the external threads of the first stud segment and the external threads of the second stud segment are continuously transitioned.

[0014] The anti-loosening bolt according to the embodiment of this utility model has at least the following beneficial effects:

[0015] This utility model of anti-loosening bolt, when the bolt body is connected to the threaded hole of the assembly, due to the eccentric setting of the central axis of the first stud segment and the central axis of the second stud segment, the threads of the first stud segment and the threads of the second stud segment cooperate with each other to form radial compression on the threaded hole of the assembly, thereby achieving the purpose of anti-loosening. The external threads of the first stud segment and the external threads of the second stud segment are continuously transitioned. The first stud segment of the anti-loosening bolt is screwed into the threaded hole of the assembly, and the second stud segment at the tail end of the first stud segment can also be screwed into the threaded hole of the assembly in the same manner, which is not easy to jam, convenient and stable to use, and provides a firm connection.

[0016] According to some embodiments of the present invention, the central axis of the first stud segment and the central axis of the second stud segment are radially spaced and are parallel to each other. A transition segment is provided between the first stud segment and the second stud segment so that the central axis of the first stud segment and the central axis of the second stud segment are eccentrically arranged.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0019] Figure 1 This is a top view of one embodiment of the anti-loosening nut of this utility model;

[0020] Figure 2 This is a schematic cross-sectional view of the eccentric through hole before machining in the first embodiment of the anti-loosening nut of this utility model;

[0021] Figure 3 This is a schematic cross-sectional view of the eccentric through hole before machining in the second embodiment of the anti-loosening nut of this utility model;

[0022] Figure 4 This is a cross-sectional view of one embodiment of the anti-loosening nut of this utility model;

[0023] Figure 5 This is a cross-sectional view of the assembly state of one embodiment of the anti-loosening nut of this utility model;

[0024] Figure 6 This is a cross-sectional view of the anti-loosening bolt of this utility model before machining;

[0025] Figure 7 This is a schematic cross-sectional view of the finished product of one embodiment of the anti-loosening bolt of this utility model;

[0026] Figure 8 This is a schematic diagram illustrating the processing of one embodiment of the anti-loosening nut of this utility model.

[0027] Figure label:

[0028] Nut body 100; first threaded hole section 110; second threaded hole section 120; first through hole section 130; second through hole section 140; transition hole section 150; mating bolt 200; bolt body 300; bolt head 310; first stud section 320; second stud section 330; cutting head 400. Detailed Implementation

[0029] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0030] In the description of this utility model, it should be understood that the directional descriptions, such as the terms "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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 utility model.

[0031] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0032] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] like Figures 1 to 7As shown, a long-lasting anti-loosening nut according to a first aspect embodiment of the present invention includes a nut body 100, the nut body 100 being provided with a screw hole, the screw hole including at least a first screw hole segment 110 and a second screw hole segment 120 along the length direction, wherein the central axis of the first screw hole segment 110 and the central axis of the second screw hole segment 120 are eccentrically arranged, and the internal threads of the first screw hole segment 110 and the internal threads of the second screw hole segment 120 are continuously transitioned.

[0034] Among them, such as Figure 1 As shown, the nut body 100 can be made of alloy material, and the outer contour of the nut body 100 can be hexagonal. The central axis of the first screw hole section 110 can be concentric with the nut body 100, while the second screw hole section 120 is eccentric relative to the first screw hole section 110.

[0035] This utility model of an anti-loosening nut, when the nut body 100 is connected to a bolt, due to the eccentric setting of the central axis of the first threaded hole section 110 and the central axis of the second threaded hole section 120, the threads of the first threaded hole section 110 and the second threaded hole section 120 cooperate with each other to form radial compression on the bolt, thereby achieving the purpose of anti-loosening. Furthermore, the internal threads of the first threaded hole section 110 and the second threaded hole section 120 are continuously transitioned, so after the bolt is screwed into the first threaded hole section 110, it can smoothly enter the second threaded hole section 120 from the tail end of the first threaded hole section 110, making it less prone to jamming. It is convenient and stable to use, and the connection is firm.

[0036] In some embodiments of this utility model, such as Figure 2 As shown, the central axis of the first screw hole segment 110 and the central axis of the second screw hole segment 120 have an inclination angle α such that the central axis of the first screw hole segment 110 and the central axis of the second screw hole segment 120 are eccentrically set.

[0037] When the bolt 200 is screwed into the first threaded hole section 110 and the second threaded hole section 120, because the central axis of the second threaded hole section 120 is inclined relative to the central axis of the first threaded hole section 110, the inner wall of the first side of the second threaded hole section 120 will press against the outer wall of the first side of the bolt 200. This causes the outer wall of the second side of the bolt to press against the inner wall of the second side of the first threaded hole section 110. Consequently, radial pressure is generated between the threads of the second threaded hole section 120 and the bolt, as well as between the threads of the first threaded hole section 110 and the bolt. When an axial force is applied externally, sufficient friction can be generated by the radial pressure, preventing the bolt from easily rotating and loosening. Specifically, as follows... Figure 5 As shown.

[0038] Specifically, the tilt angle α is less than 45°, and the manufacturer adjusts the size of the tilt angle α according to the depth of the screw hole.

[0039] In some embodiments of this utility model, such as Figure 3 As shown, the central axis of the first threaded hole section 110 and the central axis of the second threaded hole section 120 are radially spaced by a distance b. A transition hole section 150 is provided between the first threaded hole section 110 and the second threaded hole section 120. One end of the transition hole section 150 is connected to the first threaded hole section 110, and the other end of the transition hole section 150 is connected to the second threaded hole section 120. The internal threads of the first threaded hole section 110 and the internal threads of the second threaded hole section 120 are continuously connected to the inner wall of the transition hole section 150.

[0040] The central axis of the first screw hole section 110 and the central axis of the second screw hole section 120 are parallel to each other, but the central axis of the first screw hole section 110 and the central axis of the second screw hole section 120 are spaced apart in the radial direction. The transition hole sections 150 are all inclined relative to the central axis of the first screw hole section 110 and the central axis of the second screw hole section 120, so that one end of the transition hole section 150 is connected to the first screw hole section 110 and the other end of the transition hole section 150 is connected to the second screw hole section 120.

[0041] Similarly, when the bolt 200 is screwed into the first threaded hole section 110 and the second threaded hole section 120, the inner wall of the first side of the second threaded hole section 120 presses against the outer wall of the first side of the bolt 200. This causes the outer wall of the second side of the bolt to press against the inner wall of the second side of the first threaded hole section 110. Consequently, radial resistance is generated between the threads of the second threaded hole section 120 and the bolt, as well as between the threads of the first threaded hole section 110 and the bolt. When an axial force is applied externally, sufficient friction can be generated from the radial resistance, preventing the bolt from easily rotating and loosening. Specifically, as shown... Figure 5 As shown.

[0042] In some embodiments of this utility model, such as Figure 5 As shown, when the anti-loosening nut is assembled on the mating bolt 200, the stud of the mating bolt 200 passes through the first threaded hole section 110 and the second threaded hole section 120 in sequence, wherein the stud of the mating bolt 200 and the first threaded hole section 110 are concentrically arranged.

[0043] The mating bolt 200 is first inserted into the first threaded hole section 110. Since the stud of the mating bolt 200 and the first threaded hole section 110 are concentrically arranged, it is easier to insert. Then, when it is inserted into the second threaded hole section 120, the inner wall of the first side of the second threaded hole section 120 presses against the outer wall of the first side of the mating bolt 200, and the outer wall of the second side of the mating bolt 200 also presses against the inner wall of the second side of the first threaded hole section 110, thereby locking.

[0044] According to the second aspect embodiment of the present utility model, the anti-loosening bolt, such as Figure 6 , 7 As shown, the device includes a bolt body 300, a bolt head 310, and a stud disposed on the bolt head 310. The stud includes at least a first stud segment 320 and a second stud segment 330 along its length. The central axis of the first stud segment 320 and the central axis of the second stud segment 330 are eccentrically disposed, and the external threads of the first stud segment 320 and the second stud segment 330 are continuously transitioned.

[0045] The bolt body 300 can be made of conventional alloy material, and the outer contour of the bolt head 310 can be hexagonal. The bolt body 300 can mate with the screw hole of the assembly. When the bolt body 300 is screwed into the screw hole of the assembly, the outer wall of the first side of the second stud section 330 will press against the inner wall of the first side of the screw hole of the assembly. As a result, the inner wall of the second side of the screw hole of the assembly will press against the outer wall of the second side of the first stud section 320. This results in radial pressure between the threads of the second stud section 330 and the threads of the screw hole of the assembly, as well as between the threads of the first stud section 320 and the threads of the screw hole of the assembly. When an axial force is applied from the outside, sufficient friction can also be generated by the radial pressure, making it difficult for the bolt to rotate and loosen.

[0046] This utility model of anti-loosening bolt, when the bolt body 300 is connected to the threaded hole of the assembly, due to the eccentric setting of the central axis of the first stud section 320 and the central axis of the second stud section 330, the threads of the first stud section 320 and the second stud section 330 cooperate with each other to form radial compression on the threaded hole of the assembly, thereby achieving the purpose of anti-loosening. Furthermore, the external threads of the first stud section 320 and the second stud section 330 are continuously transitioned. When the first stud section 320 of the anti-loosening bolt is screwed into the threaded hole of the assembly, the second stud section 330 at the tail end of the first stud section 320 can also be screwed into the threaded hole of the assembly in the same manner, making it less prone to jamming, convenient and stable to use, and providing a firm connection.

[0047] In some embodiments of this utility model, the central axis of the first stud segment 320 and the central axis of the second stud segment 330 are radially spaced and the central axis of the first stud segment 320 and the central axis of the second stud segment 330 are parallel to each other. A transition segment is provided between the first stud segment 320 and the second stud segment 330 so that the central axis of the first stud segment 320 and the central axis of the second stud segment 330 are eccentrically set.

[0048] Specifically, the first stud segment 320 and the second stud segment 330 can each have multiple segments. The studs can be arranged in the following order along the direction away from the bolt head 310: first stud segment 320, second stud segment 330, first stud segment 320, or in the following order: first stud segment 320, second stud segment 330, first stud segment 320, second stud segment 330, first stud segment 320, and so on. Multiple first stud segments 320 and second stud segments 330 can be arranged.

[0049] The processing method for processing the anti-loosening nut disclosed in any of the above embodiments includes:

[0050] A pre-drilled through hole is provided on the nut part. The diameter of the pre-drilled through hole is relatively small. It can be understood that the projected area of ​​the pre-drilled through hole is generally within the first through hole section 130 and the second through hole section 140. The pre-drilled through hole is provided in advance for the insertion of the lathe tool into the lathe device.

[0051] The cutting head 400 of the lathe device enters from the beginning of the pre-made through hole and advances along the length direction of the pre-made through hole to process the inner wall of the pre-made through hole. When the cutting head 400 advances to the length threshold, the servo mechanism of the lathe device drives the cutting head 400 to move eccentrically relative to the central axis of the pre-made through hole and advance synchronously along the length direction of the pre-made through hole, so that the pre-made through hole is processed into an eccentric through hole. The eccentric through hole includes at least a first through hole section 130 and a second through hole section 140, and the central axis of the first through hole section 130 and the central axis of the second through hole section 140 are eccentrically set.

[0052] Using the cutting head 400 of the lathe device, the cutting head 400 enters from the beginning of the eccentric through hole and advances along the length of the eccentric through hole. The cutting head 400 of the lathe device performs thread cutting on the inner wall of the first through hole section 130 to process the internal thread of the first threaded hole section 110.

[0053] When the cutting head 400 advances to the length threshold, the servo mechanism of the lathe device drives the cutting head 400 to move eccentrically relative to the central axis of the first through hole section 130 and advance synchronously along the length direction of the eccentric through hole. The cutting head 400 of the lathe device performs thread turning on the inner wall of the second through hole section 140 to process the internal thread of the second threaded hole section 120.

[0054] The machining method utilizes a CNC lathe to control the cutting head 400 to directly extend into one end of the pre-drilled through hole and advance along its length. This differs from tapping, where a threading tool directly penetrates the nut, making it impossible to create an eccentric structure simply by extending into one end. The lathe mechanism, however, processes the inner wall of the pre-drilled through hole. The cutting head 400 does not fill the entire hole; upon reaching a length threshold, the lathe's servo mechanism drives the cutting head 400 to deviate relative to the central axis of the pre-drilled through hole. The lathe moves synchronously along the length of the pre-made through hole to process it into an eccentric through hole. Then, the inner wall of the pre-made through hole is machined by the cutter head 400 of the lathe to form the internal threads of the first threaded hole section 110 and the second threaded hole section 120. Since the cutter head 400 of the lathe moves continuously from the beginning to the end of the eccentric through hole, the internal threads of the first threaded hole section 110 and the second threaded hole section 120 transition continuously. This design is simple to process and makes the internal threads of the eccentric through hole smooth and continuous, and easy and stable to install.

[0055] In some embodiments of this utility model, the processing method further includes:

[0056] The lathe device controls the rotation of the cutting head 400 according to the preset thread diameter to process the internal thread of the first thread section 110.

[0057] When the cutter head 400 advances to the length threshold, the lathe device keeps the thread hole diameter unchanged and controls the rotation axis of the cutter head 400 to radially deviate from the center axis of the pre-made through hole in order to process the internal thread of the second thread hole section 120.

[0058] Unlike a tapping device, which drives a thread cutter 400 to rotate and penetrate a nut to form a threaded hole, a thread cutting device drives a thread cutter 400 to rotate within a pre-drilled through hole, with the thread cutter 400 closely attached to a portion of the inner wall of the pre-drilled through hole, moving along the inner wall to cut an internal thread.

[0059] When the length threshold is reached, and the machining of the first threaded hole segment 110 is changed to machining the second threaded hole segment 120, the radius of the turning tool remains unchanged, so that the threaded hole diameter remains unchanged. The rotation axis of the cutting head 400 is radially deviated from the central axis of the pre-made through hole, so that the second threaded hole segment 120 is eccentric relative to the first threaded hole segment 110.

[0060] When it is necessary for the central axis of the first threaded hole segment 110 and the central axis of the second threaded hole segment 120 to have an inclination angle α, in some embodiments of this utility model, the lathe device keeps the threaded hole diameter unchanged and controls the rotation axis of the cutter head 400 to radially deviate from the central axis of the pre-made through hole to process the internal thread of the second threaded hole segment 120. This includes obtaining the rotation angle of the cutter head 400, and the lathe device cyclically executes the eccentric step to control the cutter head 400 to process the internal thread of the second threaded hole segment 120. The eccentric step includes: when the rotation angle of the cutter head 400 reaches the first radial x, controlling the rotation axis of the cutter head 400 to move the eccentric stroke away from the central axis of the pre-made through hole along the second radial y, wherein the first radial x and the second radial y are perpendicular. Each time the rotation angle of the cutter head 400 reaches the first radial x, the eccentric stroke is moved until the second threaded hole segment 120 is processed.

[0061] by Figure 8 For example, the rotation axis of the cutter head 400 moves eccentrically away from the central axis of the pre-drilled through hole along the second radial direction y, thereby gradually forming the second threaded hole section 120 inclined to the first threaded hole section 110. The lathe device controls the movement of the cutter head 400 eccentrically, which should be executed when the rotation angle of the cutter head 400 is located at the first radial direction x. At this moment, when the servo mechanism drives the rotation axis of the cutter head 400 to move radially, the cutter head 400 is less likely to press against the inner wall of the nut part, and is less likely to jam. The internal thread processing is also smoother. Specifically, the eccentric stroke can be set according to the manufacturer's requirements for the inclination angle α between the central axis of the first threaded hole section 110 and the central axis of the second threaded hole section 120.

[0062] It is understandable that when the cutting head 400 advances to the length threshold, the servo mechanism of the lathe device drives the cutting head 400 to move eccentrically relative to the central axis of the pre-made through hole and advance synchronously along the length direction of the pre-made through hole, so that the pre-made through hole is processed into an eccentric through hole. It is also necessary to obtain the rotation angle of the cutting head 400 and then perform the eccentric step. When the rotation angle of the cutting head 400 reaches the first radial x, the rotation axis of the cutting head 400 is controlled to move eccentrically away from the central axis of the pre-made through hole along the second radial y. Then, each time the rotation angle of the cutting head 400 reaches the first radial x, the eccentric stroke is moved until the second through hole segment 140 is processed. This method also makes the inner wall of the second through hole segment 140 smoother.

[0063] When machining the nut, the second through hole section 140 is first machined by repeating the eccentric steps, and then the cutting head 400 is driven by the eccentric steps to machine the threads on the inner wall of the second through hole section 140 to form the second threaded hole section 120.

[0064] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0065] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A long-life lock nut, characterized in that The nut body is provided with a screw hole, the screw hole includes at least a first screw hole section and a second screw hole section along the length direction, wherein the central axis of the first screw hole section and the central axis of the second screw hole section are eccentrically arranged, and the internal thread of the first screw hole section and the internal thread of the second screw hole section are continuously transitioned.

2. The long- lasting lock nut of claim 1, wherein: The central axis of the first screw hole section and the central axis of the second screw hole section have an inclination angle so that the central axis of the first screw hole section and the central axis of the second screw hole section are eccentrically arranged.

3. A long- lasting lock nut as claimed in claim 2, wherein: The inclination angle is less than 45°.

4. The long-lasting lock nut of claim 1, wherein: The central axis of the first screw hole section and the central axis of the second screw hole section have a radial spacing, a transition hole section is arranged between the first screw hole section and the second screw hole section, one end of the transition hole section is in abutment with the first screw hole section, the other end of the transition hole section is in abutment with the second screw hole section, and the internal thread of the first screw hole section and the internal thread of the second screw hole section are continuously transitioned to the inner wall of the transition hole section.

5. The long-lasting lock nut of claim 1, wherein: When the lock nut is assembled on the cooperating bolt, the shank of the cooperating bolt passes through the first screw hole section and the second screw hole section in sequence, wherein the shank of the cooperating bolt and the first screw hole section are concentrically arranged.

6. A check bolt characterized by, The bolt body is provided with a bolt head and a shank arranged on the bolt head, the shank includes at least a first shank section and a second shank section along the length direction, wherein the central axis of the first shank section and the central axis of the second shank section are eccentrically arranged, and the external thread of the first shank section and the external thread of the second shank section are continuously transitioned.

7. A check bolt according to claim 6 wherein: The central axis of the first shank section and the central axis of the second shank section have a radial spacing and are parallel to each other, and a transition column section is arranged between the first shank section and the second shank section so that the central axis of the first shank section and the central axis of the second shank section are eccentrically arranged.

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