Anti-loosening self-locking bolt

Abstract

The anti-loosening self-locking bolt comprises a bolt body, a first external thread and a second external thread are arranged on the outer wall of the bolt body up and down, and the thread directions of the first external thread and the second external thread are opposite; a first internal thread matched with the first external thread is arranged in the fastening nut, and a plurality of self-locking convex blocks are uniformly arranged on one end face of the fastening nut in the circumferential direction of the fastening nut; the anti-loosening nut is internally provided with a second internal thread matched with the second external thread, and one end face of the anti-loosening nut is uniformly provided with a plurality of self-locking grooves in one-to-one correspondence with the self-locking convex blocks in the circumferential direction of the anti-loosening nut; when the fastening nut and the anti-loosening nut are both pre-tightened, the self-locking protruding blocks are clamped into the self-locking grooves in a one-to-one correspondence mode to be fixed in a mortise and tenon mode. The anti-loosening nut is screwed more and more tightly, the self-locking purpose is achieved, and the fastening nut is prevented from loosening due to vibration.

Description

TECHNICAL FIELD

[0001] The utility model relates to bolt connection technical field especially relates to a kind of anti-loosening self-locking bolt. BACKGROUND

[0002] Bolt is a kind of fastener for fastening two parts with through hole, when using, first screw rod passes through the through hole on the part, then nut is tightened on screw rod to fasten two parts;General bolt does not have self-locking function, in the process of use, bolt is easily separated by vibration, leading to connection not firm, thereby causing safety accident, to prevent this phenomenon, therefore, bolt with self-locking function is invented.

[0003] The existing self-locking bolt includes screw rod, nut and two gaskets, the two gaskets are engaged between them, and the oblique tooth angle at the engagement surface of the engagement is greater than the thread angle of the bolt, so that the bolt will be loosened and will be subjected to a large friction force on the upper surface of the gasket, thereby achieving the purpose of self-locking;But the self-locking bolt uses more components, and the structure is complex, when fastening the parts, the bolt, the gasket and the nut need to be assembled in sequence, and the fastening process is complex. SUMMARY

[0004] In view of the above defects or deficiencies in the prior art, it is desirable to provide an anti-loosening self-locking bolt which is simple in structure and easy to operate, and the fastening nut and the anti-loosening nut are mutually locked after pre-tightening, and cannot be rotated in opposite directions, and the setting of the reverse thread makes the anti-loosening nut tighter, achieving the purpose of self-locking.

[0005] The utility model provides a kind of anti-loosening self-locking bolt, comprising:

[0006] Bolt, first outer thread and second outer thread are provided on its outer wall, and the thread direction of the first outer thread is opposite to that of the second outer thread;

[0007] Fastening nut, first inner thread is provided in the inside thereof and matched with the first outer thread, and a plurality of self-locking protrusions are uniformly provided on one end face thereof along the circumferential direction;

[0008] Anti-loosening nut, second inner thread is provided in the inside thereof and matched with the second outer thread, and a plurality of self-locking grooves corresponding to the self-locking protrusions are uniformly provided on one end face thereof along the circumferential direction;When the fastening nut and the anti-loosening nut are both pre-tightened, the self-locking protrusions are correspondingly clamped into the self-locking grooves and are fixed by mortise and tenon joint;

[0009] One side surface of the self-locking protrusion along its length direction is provided as a first vertical surface, one side surface of the self-locking groove along its length direction is provided as a second vertical surface, and the height of the first vertical surface is consistent with that of the second vertical surface;

[0010] The other side of the self-locking protrusion along the length direction is provided with a first inverted bevel at the connection with the end surface of the fastening nut, and the other side of the self-locking groove along the length direction is provided with a second inverted bevel at the connection with the end surface of the anti-loosening nut, and the angle of the first inverted bevel is greater than the angle of the second inverted bevel.

[0011] Further, the bolt comprises a first screw rod and a second screw rod arranged integrally, the first screw rod is provided with the first external thread on the outer wall, the second screw rod is provided with the second external thread on the outer wall, and the diameter of the first screw rod is greater than the diameter of the second screw rod.

[0012] The anti-loosening nut is coaxially provided with a first inner cavity and a second inner cavity, the first inner cavity and the second inner cavity are in a cylindrical shape, the second inner cavity is provided with the second internal thread on the inner wall, and the diameter of the first inner cavity is greater than the diameter of the first screw rod.

[0013] Further, the inner wall of the first inner cavity is provided with a smooth curved surface structure.

[0014] Further, the number of the self-locking grooves arranged on the end surface of the anti-loosening nut is 6-18, and the number of the self-locking protrusions and the self-locking grooves is consistent.

[0015] Compared with the prior art, the utility model has the beneficial effects that:

[0016] When the device is fastened, the bolt and the fastening nut are used to fasten the device first, the position of the fastening nut is fixed after fastening, then the anti-loosening nut is screwed into the bolt, until the fastening protrusions on the end surface of the fastening nut are clamped into the fastening grooves on the end surface of the anti-loosening nut, the fastening protrusions are clamped into the fastening grooves to be fixed, so that the fastening nut and the anti-loosening nut are clamped and cannot rotate in the opposite direction; when the fastening nut rotates due to vibration, the anti-loosening nut rotates in the same direction, and the thread directions of the first external thread and the second external thread arranged on the outer wall of the bolt are opposite, so that the anti-loosening nut is tightened when the fastening nut rotates, thereby achieving the purpose of self-locking of the bolt and improving the stability of the self-locking bolt; and the application only comprises the bolt, the fastening nut and the anti-loosening nut, the structure is simple, the device is fastened conveniently, and the self-locking stability is high.

[0017] It should be understood that the content described in the utility model content part is not intended to limit the key or important features of the embodiments of the utility model, nor is it intended to limit the scope of the utility model. Other features of the utility model will become easy to understand through the following description. BRIEF DESCRIPTION OF DRAWINGS

[0018] Other features, objects, and advantages of the present application will become more apparent from the following detailed description when read in conjunction with the accompanying drawings:

[0019] Figure 1 It is a front structure schematic view of the present application;

[0020] Figure 2 It is a perspective view of the bolt;

[0021] Figure 3 It is an assembly view of the fastening nut and the anti-loose nut;

[0022] Figure 4 It is an exploded view of the fastening nut and the anti-loose nut from one angle;

[0023] Figure 5 It is an exploded view of the fastening nut and the anti-loose nut from another angle;

[0024] Figure 6 It is a perspective view of the fastening nut;

[0025] Figure 7 It is a perspective view of the anti-loose nut;

[0026] Reference signs in the drawings: 1, bolt;2, fastening nut;3, anti-loose nut;

[0027] 11, first external thread;12, second external thread;13, first screw rod;14, second screw rod;

[0028] 21, first internal thread;22, self-locking protrusion;

[0029] 31, second internal thread;32, self-locking groove;33, first internal cavity;34, second internal cavity;

[0030] 221, first vertical surface;222, first inverted bevel;

[0031] 321, second vertical surface;322, second inverted bevel. DETAILED DESCRIPTION

[0032] The present application will be further described below in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the related application, and not to limit the application. In addition, it should be noted that, for the convenience of description, only the parts related to the application are shown in the drawings.

[0033] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0034] Please refer toFigures 1-7 The embodiment of the utility model provides a kind of anti-loosening self-locking bolt, including bolt 1, fastening nut 2 and anti-loosening nut 3, wherein, the outer wall of the stem of bolt 1 is provided with first outer thread 11 and second outer thread 12 from top to bottom, and the thread direction of first outer thread 11 and second outer thread 12 is opposite;

[0035] The inside of fastening nut 2 is provided with the first inner thread 21 matched with the first outer thread 11, and a plurality of self-locking lugs 22 are uniformly arranged on one end face thereof along the circumferential direction thereof;Specifically, fastening nut 2 and bolt 1 are connected by first outer thread 11 and first inner thread 21;

[0036] The inside of anti-loosening nut 3 is provided with the second inner thread 31 matched with the second outer thread 12, and a plurality of self-locking grooves 32 corresponding to the self-locking lugs 22 are uniformly arranged on one end face thereof along the circumferential direction thereof;When fastening nut 2 and anti-loosening nut 3 are pre-tightened, self-locking lugs 22 are correspondingly clamped into self-locking grooves 32 to be mortise fixed;Specifically, anti-loosening nut 3 and bolt 1 are connected by second outer thread 12 and second inner thread 31.

[0037] In the embodiment, since the thread direction of first outer thread 11 and second outer thread 12 is opposite, when fastening nut 2 and anti-loosening nut 3 rotate in the same direction, the displacement direction of the two is opposite, as shown in Figure 1 The segment of fastening nut 2 and bolt 1 with first outer thread 11 is threadedly connected, the segment of anti-loosening nut 3 and bolt 1 with second outer thread 12 is threadedly connected, and when fastening nut 2 rotates in clockwise direction from top to bottom, fastening nut 2 moves downward, since the thread direction of first outer thread 11 and second outer thread 12 is opposite, when anti-loosening nut 3 rotates in clockwise direction, anti-loosening nut 3 moves upward;

[0038] When the device is fastened, the device is first fastened by the bolt 1 and the fastening nut 2 until the fastening nut 2 is closely attached to the machining surface of the device, and then the anti-loosening nut 3 is screwed into the bolt 1 until the fastening protrusions 22 on the end surface of the fastening nut 2 are clamped into the fastening grooves 32 on the end surface of the anti-loosening nut 3, the fastening protrusions 22 and the fastening grooves 32 are connected in a mortise and tenon structure, the fastening protrusions 22 are clamped into the fastening grooves 32 to be fixed, so that the fastening nut 2 and the anti-loosening nut 3 are clamped in each other and cannot rotate in the opposite direction again; when the fastening nut 2 is rotated due to vibration, the anti-loosening nut 3 rotates in the same direction, and since the first external thread 11 and the second external thread 12 arranged on the outer wall of the bolt 1 have opposite thread directions, when the fastening nut 2 moves downward due to rotation, the anti-loosening nut 3 moves upward due to rotation, and the anti-loosening nut 3 is tightened more and more, thereby achieving the purpose of self-locking of the bolt, and the stability of the self-locking bolt is high; and the application only includes the bolt, the fastening nut and the anti-loosening nut, the structure is simple, the operation is convenient when the device is fastened, and the self-locking stability is high.

[0039] In a preferred embodiment, as shown in Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 , the self-locking protrusions 22 are arranged as first vertical faces 221 on one side of the length direction, and the self-locking grooves 32 are arranged as second vertical faces 321 on one side of the length direction, and the heights of the first vertical faces 221 and the second vertical faces 321 are consistent.

[0040] In the embodiment, as shown in Figure 4 and Figure 5 , the self-locking protrusions 22 are protrudingly arranged on one end surface of the fastening nut 2, and the self-locking grooves 32 are recessively arranged on one end surface of the anti-loosening nut 3; viewed from bottom to top, the rotation direction of the anti-loosening nut 3 when pre-tightening is the clockwise direction, when the anti-loosening nut 3 fastens and self-locks the fastening nut 2, the anti-loosening nut 3 is screwed into the nut 1, and then the anti-loosening nut 3 is rotated in the clockwise direction, the anti-loosening nut 3 moves upward, until the self-locking protrusions 22 fall into the self-locking grooves 32, at this time, the first vertical faces 221 and the second vertical faces 321 are attached and abutted, the fastening nut 2 and the anti-loosening nut 3 are clamped, and the anti-loosening nut 3 cannot rotate in the counterclockwise direction again, so the anti-loosening nut 3 cannot move downward and loosen.

[0041] In a preferred embodiment, as shown in Figure 4 、 Figure 5 、 Figure 6 、 Figure 7As shown, the other side of the self-locking protrusion 22 along the length direction is provided with a first inverted bevel 222 at the joint with the end surface of the fastening nut 2, and the other side of the self-locking groove 32 along the length direction is provided with a second inverted bevel 322 at the joint with the end surface of the anti-loosening nut 3, and the angle of the first inverted bevel 222 is greater than the angle of the second inverted bevel 322.

[0042] In the embodiment, the first inverted bevel 222 is arranged to make one side of the self-locking protrusion 22 an inclined surface, and the second inverted bevel 322 is arranged to make one side of the self-locking groove 32 an inclined surface, which facilitates the self-locking protrusion 22 to be clamped into the self-locking groove 32 when the anti-loosening nut 3 rotates.

[0043] In a preferred embodiment, as shown in Figure 1 , Figure 2 and Figure 7 , the bolt 1 comprises a first screw rod 13 and a second screw rod 14 arranged integrally, the outer wall of the first screw rod 13 is provided with a first external thread 11, the outer wall of the second screw rod 14 is provided with a second external thread 12, and the diameter of the first screw rod 13 is greater than the diameter of the second screw rod 14; specifically, the bolt 1 further comprises a head, and the top of the first screw rod 13 is arranged integrally with the head of the bolt 1; when fastening the equipment, the bolt 1 penetrates the mounting hole on the equipment, and the head of the bolt 1 and the fastening nut 2 clamp and fasten the equipment.

[0044] The anti-loosening nut 3 is coaxially provided with a first inner cavity 33 and a second inner cavity 34, both of which are in a cylindrical shape, the inner wall of the second inner cavity 34 is provided with a second internal thread 31, and the diameter of the first inner cavity 33 is greater than the diameter of the first screw rod 13.

[0045] Specifically, the self-locking groove 32 is arranged on the end surface of the anti-loosening nut 3 close to the first cavity 33, after fastening the equipment, the end surface of the anti-loosening nut with the self-locking groove 32 faces the fastening nut 2, i.e., the first inner cavity 33 of the anti-loosening nut 3 is close to the first screw rod 13, the anti-loosening nut 3 is screwed into the second screw rod 14, and the anti-loosening nut 3 gradually approaches the fastening nut 2 and the first screw rod 13 in the process of rotation; when fastening the equipment with a small thickness, the fastening nut 2 is completely set on the outside of the first screw rod 13, and the first inner cavity 33 of the anti-loosening nut 3 is set on the outside of the first screw rod 13 when the anti-loosening nut 3 is clamped with the fastening nut 2; through the arrangement of the first inner cavity 33, the anti-loosening nut 3 can be partially set on the outside of the first screw rod 13, so as to meet the fastening of equipment with different thicknesses and expand the application range.

[0046] In a preferred embodiment, as shown in Figure 7 , the inner wall of the first inner cavity 33 is arranged in a smooth curved surface structure.

[0047] In a preferred embodiment, as shown inFigure 4 and Figure 5 As shown in the figure, the number of self-locking grooves 32 arranged on the end face of the anti-loose nut 3 is 6-18, and the number of self-locking protrusions 22 and self-locking grooves 32 is consistent. In the actual production process, the number of self-locking grooves 32 and self-locking protrusions 22 can be set according to the design requirements. In the figure legend of the present application, 6 self-locking grooves 32 are arranged on the end face of the anti-loose nut 3, and 6 self-locking protrusions 22 are arranged on the end face of the fastening nut 2.

[0048] Working principle:

[0049] When the device is fastened, the device is first fastened by the bolt 1 and the fastening nut 2 until the fastening nut 2 is tightly attached to the machining surface of the device. After fastening, the anti-loose nut 3 is screwed into the bolt 1 until the fastening protrusions 22 on the end face of the fastening nut 2 are clamped into the fastening grooves 32 on the end face of the anti-loose nut 3. The fastening protrusions 22 are clamped into the fastening grooves 32 to be fixed, so that the fastening nut 2 and the anti-loose nut 3 are mutually clamped, and the anti-loose nut 3 and the fastening nut 2 cannot rotate in the opposite direction. When the fastening nut 2 is rotated due to vibration, the anti-loose nut 3 rotates in the same direction. Since the first external thread 11 and the second external thread 12 arranged on the outer wall of the bolt 1 have opposite thread directions, when the fastening nut 2 moves downward due to rotation, the anti-loose nut 3 moves upward due to rotation. The anti-loose nut 3 is tightened more and more, thereby achieving the purpose of self-locking of the bolt. The stability of the self-locking bolt is high. Moreover, the present application only includes a bolt, a fastening nut and an anti-loose nut, and has a simple structure. When the device is fastened, the operation is convenient, and the self-locking stability is high.

[0050] In the description of the present specification, the terms "connection", "installation", "fixation" and the like should be understood in a broad sense, for example, "connection" can be fixed connection, or detachable connection, or integrally connected; can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0051] In the description of the present specification, the description of the terms "one embodiment", "some embodiments" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0052] The above merely provides preferred embodiments of the present application, and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the principles and technical scope of the present application shall fall into the scope of the present application.

Claims

1. A self-locking bolt against loosening, characterized by, The utility model relates to a bolt, a fastening nut and a lock nut, and belongs to the technical field of fastening. The bolt comprises a first screw rod and a second screw rod, the outer wall of the first screw rod is provided with a first external thread, and the outer wall of the second screw rod is provided with a second external thread. The fastening nut comprises a first internal thread matched with the first external thread, and a plurality of self-locking protrusions uniformly arranged on one end face along the circumference. The lock nut comprises a second internal thread matched with the second external thread, and a plurality of self-locking grooves corresponding to the self-locking protrusions uniformly arranged on one end face along the circumference. When the fastening nut and the lock nut are pre-tightened, the self-locking protrusions are correspondingly clamped into the self-locking grooves. The side surface of the self-locking protrusion along the length direction is provided with a first vertical surface, and the side surface of the self-locking groove along the length direction is provided with a second vertical surface.

2. The self-locking bolt according to claim 1, wherein The other side surface of the self-locking protrusion along the length direction is provided with a first inverted bevel at the connection with the end face of the fastening nut, and the other side surface of the self-locking groove along the length direction is provided with a second inverted bevel at the connection with the end face of the lock nut. The angle of the first inverted bevel is greater than the angle of the second inverted bevel.

3. A self-locking bolt according to claim 2, wherein The bolt comprises a first screw rod and a second screw rod, the outer wall of the first screw rod is provided with the first external thread, and the outer wall of the second screw rod is provided with the second external thread.

4. The self-locking bolt of claim 1, wherein The lock nut is coaxially provided with a first internal cavity and a second internal cavity, the first internal cavity and the second internal cavity are both cylindrical, the inner wall of the second internal cavity is provided with the second internal thread, and the diameter of the first internal cavity is greater than the diameter of the first screw rod. The inner wall of the first internal cavity is provided with a smooth curved surface structure. The number of self-locking grooves arranged on the end face of the lock nut is 6-18, and the number of self-locking protrusions and the number of self-locking grooves are consistent.

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