Automobile lock bolt with self-locking structure

Abstract

The utility model relates to the technical field of bolts, in particular to an automobile lock bolt with a self-locking structure, which comprises a hexagon bolt head and a screw concentrically connected to one end of the hexagon bolt head, a receding hole is arranged in the center of the hexagon bolt head, and a transmission threaded hole communicated with the receding hole and concentric with the receding hole is arranged in the center of the receding hole. A transition hole communicated with the transmission threaded hole is formed in the center of the screw rod, a conical hole concentric with and communicated with the transition hole is formed in the end, away from the hexagon bolt head, of the screw rod, a cross-shaped open groove communicated with the conical hole is formed in the end, away from the hexagon bolt head, of the screw rod and extends to the transition hole, and a threaded pull rod is in threaded connection with the interior of the transmission threaded hole. One end of the threaded pull rod penetrates through the conical hole and is detachably connected with a conical boss, and the other end of the threaded pull rod is connected with an inner hexagonal head which is located in the receding hole. The device further comprises a circumferential limiting assembly for preventing the inner hexagonal head from rotating. The device is reasonable in structure, improves the operation convenience, can be repeatedly used, and reduces the use cost.

Description

Technical Field

[0001] This utility model relates to the field of bolt technology, and in particular to an automotive anti-loosening bolt with a self-locking structure. Background Technology

[0002] Bolts are widely used fasteners in automobile assembly. During vehicle operation, cars are subjected to various complex forces, including vibration, impact, and centrifugal force, which can cause bolts to gradually loosen, affecting the stability of the connections between automotive components and potentially leading to safety accidents in severe cases. Therefore, it is necessary to use anti-loosening bolts with self-locking functions to enhance the stability and firmness of the connections between components. Publication No.: CN222026124U provides an anti-loosening bolt, including a bolt head, an elastic plate, and a bolt shank. The bolt shank has a through hole inside, opening from the side of the bolt shank away from the bolt head and extending into the interior of the bolt head, connecting with the injection hole to form a through channel. Heat reaches the interior of the bolt shank through this through channel. Multiple strip-shaped through grooves are provided on the side of the bolt shank away from the bolt head, opening from the same side. These grooves allow stress to be concentrated and released near the grooves when the bolt is under internal stress. An alloy metal with a high coefficient of thermal expansion is embedded in the opening of the through hole. When heated, the alloy metal expands and can spread the bolt shank away from the bolt head, increasing the friction between the threads and achieving the anti-loosening purpose.

[0003] The existing technical solutions described above have the following drawbacks: The inventors discovered that when an alloy metal with a high coefficient of thermal expansion expands due to heat, it can push the bolt shank away from the bolt head, increasing the friction between the threads. Then, grouting material is injected into the through hole through the injection hole to fill it, so that the threads have a large friction for a long time, achieving the purpose of preventing loosening. However, when the car needs to be repaired and maintained after a long period of use, the grouting material cannot be removed, that is, the friction between the threads cannot be reduced, and it is inconvenient to remove the anti-loosening bolt. A destructive disassembly method is required, and the anti-loosening bolt cannot be reused, reducing the convenience of operation. Utility Model Content

[0004] The main technical problem solved by this utility model is to provide an automotive anti-loosening bolt with a self-locking structure, which improves the convenience of operation, can be reused, and reduces the cost of use.

[0005] To solve the above-mentioned technical problems, the present invention provides a technical solution as follows: A self-locking automotive anti-loosening bolt is provided, comprising: a hexagonal bolt head and a screw concentrically connected to one end of the hexagonal bolt head. The hexagonal bolt head has a clearance hole at its center, and a drive threaded hole concentrically connected to and communicating with the clearance hole at its center. The screw has a transition hole communicating with the drive threaded hole at its center. The end of the screw away from the hexagonal bolt head has a concentric and communicating tapered hole. The far end of the screw has a cross-shaped opening groove communicating with the tapered hole. The cross-shaped opening groove extends to the transition hole. A threaded pull rod is internally threaded into the drive threaded hole. One end of the threaded pull rod passes through the tapered hole and is detachably connected to a tapered boss. The other end is connected to an internal hexagonal head, which is located inside the clearance hole.

[0006] It also includes a circumferential limiting component to prevent the internal hexagon head from rotating.

[0007] By adopting the above technical solution, during use, after the anti-loosening bolt connects the parts with threads, the head of the Allen wrench is rotated. The Allen head drives the threaded pull rod to rotate. Since the threaded pull rod is threadedly connected to the drive threaded hole, the threaded pull rod pulls the tapered boss into the tapered hole. Through the action of the cross-shaped opening groove at the end of the screw, the tapered boss opens up the area on the screw located in the cross-shaped opening groove, thereby increasing the outer diameter of the screw, that is, increasing the friction between the screw and the automotive parts, achieving the purpose of anti-loosening; through the round The use of the circumferential limit component prevents the internal hex head and threaded rod from rotating in the opposite direction, allowing the tapered boss to keep the tapered hole open for a long time, thus achieving the purpose of long-term anti-loosening. By operating the circumferential limit component to release the restriction on the circumferential rotation of the internal hex head, the internal hex head can be rotated in the opposite direction using an internal hex wrench, and the tapered boss moves outward from the tapered hole, restoring the outer diameter of the screw to its initial state. This makes it easy to remove the anti-loosening bolt from the car using an open-end wrench, improving the convenience of operation. Furthermore, the anti-loosening bolt can be reused, reducing the cost of use.

[0008] In a preferred embodiment, the present invention can be further configured as follows: the circumferential limiting component includes a Z-shaped pin and an oblong through hole provided on the outer circle of the internal hexagonal head; the sides of the hexagonal bolt head are respectively provided with circular through holes; the circular through holes on the symmetrical sides of the hexagonal bolt head are concentrically arranged; and the Z-shaped pin is inserted into the oblong through hole and the corresponding circular through hole.

[0009] By adopting the above technical solution, the internal hex wrench is used to rotate the internal hex head to a certain angle. When the tapered boss moves into the tapered hole, the tapered boss opens the end of the screw to achieve the purpose of preventing loosening. Then, the Z-shaped pin is inserted into the waist-shaped through hole and the corresponding circular through hole to prevent the internal hex head from rotating in the opposite direction, so that the anti-loosening bolt can remain in an anti-loosening state for a long time.

[0010] In a preferred embodiment, the present invention can be further configured such that: the small-diameter end of the tapered boss is provided with a fixed threaded hole, and the fixed threaded hole is threadedly connected to the end of the threaded tie rod.

[0011] By adopting the above technical solution, the convenience of assembly is improved because the fixed threaded hole and the end of the threaded tie rod are connected by threads.

[0012] In a preferred embodiment, the present invention can be further configured such that: the threaded pull rod rotates clockwise, driving the tapered boss to move into the tapered hole; the threaded pull rod rotates clockwise, and the end of the threaded pull rod is screwed into the fixed threaded hole on the tapered boss.

[0013] By adopting the above technical solution, rotating the threaded rod clockwise causes the tapered boss to move into the tapered hole, while the threaded rod is tightly threadedly connected to the fixed threaded hole on the tapered boss.

[0014] In a preferred embodiment, the present invention can be further configured such that the diameter of the transition hole is one-quarter of the outer diameter of the screw.

[0015] By adopting the above technical solution, since the diameter of the transition hole is one-quarter of the outer diameter of the screw, the impact of the existence of the transition hole on the structural strength of the screw is reduced.

[0016] In a preferred embodiment, the present invention can be further configured such that an indicator line is provided at the outer end of the internal hexagon head.

[0017] By adopting the above technical solution, when the indicator line is perpendicular to the side of the hexagonal bolt head, the waist-shaped through hole is connected to the corresponding circular through hole.

[0018] In summary, this utility model has at least one of the following beneficial technical effects:

[0019] 1. The threaded tie rod pulls the tapered boss into the tapered hole. Through the action of the cross-shaped opening groove at the end of the screw, the tapered boss opens up the area on the screw located in the cross-shaped opening groove, thereby increasing the outer diameter of the screw, which increases the friction between the screw and the automotive parts, thus achieving the purpose of preventing loosening.

[0020] 2. The circumferential limit component is operated to release the restriction on the circumferential rotation of the internal hexagon head. The internal hexagon head is rotated in the opposite direction using an internal hexagon wrench. The tapered boss moves outward from the tapered hole, and the outer diameter of the screw returns to its initial state. This makes it easy to remove the anti-loosening bolt from the car using an open-end wrench, improving the convenience of operation. The anti-loosening bolt can also be reused, reducing the cost of use. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0022] Figure 1 This is a schematic diagram of a preferred embodiment of an automotive anti-loosening bolt with a self-locking structure according to the present invention.

[0023] Figure 2 yes Figure 1 Sectional view along line AA.

[0024] Figure 3 This is another structural schematic diagram of the present invention.

[0025] Figure 4 yes Figure 1 A schematic diagram of the middle screw.

[0026] In the diagram: 1. Hex bolt head; 2. Screw; 3. Clearance hole; 4. Drive threaded hole; 5. Transition hole;

[0027] 6. Tapered hole; 7. Cross-shaped opening slot; 8. Threaded tie rod; 90. Circumferential limit assembly; 11. Tapered boss; 12. Hexagonal head; 13. Fixed threaded hole; 14. Indicator line;

[0028] 91. Z-shaped pin; 92. Waist-shaped through hole; 93. Circular through hole. Detailed Implementation

[0029] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0030] It should be noted that these figures are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0031] Reference Figures 1-4This utility model discloses an automotive anti-loosening bolt with a self-locking structure, comprising: a hexagonal bolt head 1 and a screw 2 concentrically connected to one end of the hexagonal bolt head 1. The hexagonal bolt head 1 has a relief hole 3 at its center, and a drive threaded hole 4 concentrically connected to and communicating with the relief hole 3 at its center. The screw 2 has a transition hole 5 concentrically connected to the drive threaded hole 4 at its center. The end of the screw 2 away from the hexagonal bolt head 1 has a concentric and connected tapered hole 6 concentrically connected to the transition hole 5. The far end of the screw 2 has a cross-shaped opening groove 7 concentrically connected to the tapered hole 6, and the cross-shaped opening groove 7 extends to the transition hole 5. A threaded pull rod 8 is internally threaded into the drive threaded hole 4. One end of the threaded pull rod 8 passes through the tapered hole 6 and is detachably connected to a tapered boss 11, and the other end is connected to an internal hexagonal head 12, which is located inside the relief hole 3.

[0032] The diameter of the transition hole 5 is one-quarter of the outer diameter of the screw 2; since the diameter of the transition hole 5 is one-quarter of the outer diameter of the screw 2, the impact of the presence of the transition hole 5 on the structural strength of the screw 2 is reduced.

[0033] The tapered boss 11 has a fixed threaded hole 13 at its small diameter end, and the fixed threaded hole 13 is threadedly connected to the end of the threaded tie rod 8; since the fixed threaded hole 13 is threadedly connected to the end of the threaded tie rod 8, the ease of assembly is improved.

[0034] It also includes a circumferential limiting component 90 to prevent the internal hexagon head 12 from rotating; the circumferential limiting component 90 includes a Z-shaped pin 91 and an oblong through hole 92 provided on the outer circle of the internal hexagon head 12. The sides of the hexagon head 1 are respectively provided with circular through holes 93. The circular through holes 93 on the symmetrical sides of the hexagon head 1 are concentrically arranged. The Z-shaped pin 91 is inserted into the oblong through hole 92 and the corresponding circular through hole 93. When the internal hexagon head 12 is rotated by an internal hexagon wrench at a certain angle, when the conical boss 11 moves into the conical hole 6, the conical boss 11 opens the end of the screw 2 to achieve the purpose of anti-loosening. Then, the Z-shaped pin 91 is inserted into the oblong through hole 92 and the corresponding circular through hole 93 to prevent the internal hexagon head 12 from rotating in the opposite direction, so that the anti-loosening bolt can remain in an anti-loosening state for a long time.

[0035] The threaded pull rod 8 rotates clockwise, driving the tapered boss 11 to move into the tapered hole 6. The end of the threaded pull rod 8 is screwed into the fixed threaded hole 13 on the tapered boss 11. The threaded pull rod 8 is rotated clockwise, causing the tapered boss 11 to move into the tapered hole 6. At the same time, the threaded pull rod 8 is tightly threadedly connected to the fixed threaded hole 13 on the tapered boss 11.

[0036] The outer end of the internal hexagon head 12 is provided with an indicator line 14; when the indicator line 14 is perpendicular to the side of the hexagon head 1, the waist-shaped through hole 92 is connected to the corresponding circular through hole 93, which makes it easy to insert the Z-shaped pin 91 into the waist-shaped through hole 92 and the corresponding circular through hole 93.

[0037] The implementation principle of this embodiment is as follows: During use, after the anti-loosening bolt connects the components via threads, an Allen wrench is used to rotate the Allen head 12. The Allen head 12 drives the threaded pull rod 8 to rotate. Since the threaded pull rod 8 is threadedly connected to the transmission threaded hole 4, the threaded pull rod 8 pulls the tapered boss 11 into the tapered hole 6. Through the action of the cross-shaped opening groove 7 at the end of the screw 2, the tapered boss 11 opens the area on the screw 2 located in the cross-shaped opening groove 7, thereby expanding the outer diameter of the screw 2, i.e., increasing the friction between the screw 2 and the automotive components, achieving the purpose of anti-loosening; through The use of the circumferential limiting component 90 prevents the internal hexagon head 12 and the threaded tie rod 8 from rotating in opposite directions, allowing the tapered boss 11 to keep the tapered hole 6 open for a long time, thus achieving the purpose of preventing loosening for a long time. By operating the circumferential limiting component 90, the restriction on the circumferential rotation of the internal hexagon head 12 can be released. Using an internal hexagon wrench to rotate the internal hexagon head 12 in the opposite direction, the tapered boss 11 moves outward from the tapered hole 6, and the outer diameter of the screw 2 returns to its initial state. This makes it easy to remove the anti-loosening bolt from the car using an open-end wrench, improving the convenience of operation. Furthermore, the anti-loosening bolt can be reused, reducing the cost of use.

[0038] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made using the content of this utility model specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. An automotive anti-loosening bolt with a self-locking structure, comprising: A hexagonal bolt head (1) and a screw (2) concentrically connected to one end of the hexagonal bolt head (1), characterized in that the hexagonal bolt head (1) has a relief hole (3) at its center, the relief hole (3) has a drive thread hole (4) concentrically connected to and communicating with it at its center, the screw (2) has a transition hole (5) concentrically connected to and communicating with the drive thread hole (4) at its center, and the end of the screw (2) away from the hexagonal bolt head (1) has a concentric and concentric tapered end concentrically connected to and communicating with the transition hole (5). The screw (2) has a tapered hole (6) and a cross-shaped opening groove (7) that communicates with the tapered hole (6) at one end. The cross-shaped opening groove (7) extends to the transition hole (5). The transmission threaded hole (4) is internally threaded with a threaded pull rod (8). One end of the threaded pull rod (8) passes through the tapered hole (6) and is detachably connected to a tapered boss (11). The other end is connected to an internal hexagon head (12). The internal hexagon head (12) is located in the relief hole (3). It also includes a circumferential limiting component (90) to prevent the internal hexagon head (12) from rotating.

2. The automotive anti-loosening bolt with a self-locking structure according to claim 1, characterized in that, The circumferential limiting component (90) includes a Z-shaped pin (91) and a waist-shaped through hole (92) provided on the outer circle of the internal hexagonal head (12). The sides of the hexagonal bolt head (1) are respectively provided with circular through holes (93). The circular through holes (93) on the symmetrical sides of the hexagonal bolt head (1) are concentrically arranged. The Z-shaped pin (91) is inserted into the waist-shaped through hole (92) and the corresponding circular through hole (93).

3. The automotive anti-loosening bolt with a self-locking structure according to claim 1, characterized in that, The tapered boss (11) has a fixed threaded hole (13) at its small diameter end, and the fixed threaded hole (13) is threadedly connected to the end of the threaded pull rod (8).

4. The automotive anti-loosening bolt with a self-locking structure according to claim 3, characterized in that, The threaded rod (8) rotates clockwise, driving the conical boss (11) to move into the conical hole (6). The threaded rod (8) rotates clockwise, and the end of the threaded rod (8) is screwed into the fixed threaded hole (13) on the conical boss (11).

5. The automotive anti-loosening bolt with a self-locking structure according to claim 1, characterized in that, The diameter of the transition hole (5) is one-quarter of the outer diameter of the screw (2).

6. The automotive anti-loosening bolt with a self-locking structure according to claim 1, characterized in that, The outer end of the internal hexagon head (12) is provided with an indicator line (14).

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