A self-locking automotive screw

Abstract

This utility model proposes a self-locking automotive screw, including a screw rod and a screw head. The screw rod has a receiving hole extending through its front end, and a thin film bag containing glue is placed inside the receiving hole. It also includes a tubular extrusion tube, the outer diameter of which is equal to the diameter of the receiving hole, and the inner diameter of which is equal to or less than half the diameter of the receiving hole. In use, the extrusion tube is first inserted into the threaded hole, and then the screw rod is screwed into the threaded hole. As the screw rod is screwed in, the extrusion tube enters the receiving hole, puncturing the thin film bag, allowing the glue inside to flow out. As the extrusion tube continues to enter the receiving cavity, the glue is forced into the interior of the extrusion tube and flows out from the glue outlet on the extrusion tube, entering the threaded hole. As the screw rod is gradually tightened, the glue enters the space between the screw rod and the threaded hole. After the glue cures, a self-locking structure is formed between the screw rod and the threaded hole.

Description

Technical Field

[0001] This utility model relates to the field of hardware fastener technology, specifically to a self-locking automotive screw. Background Technology

[0002] In the field of vehicle manufacturing, screws, as a basic and critical type of fastener, play a core role in ensuring the stability of connections between various components. In the automotive chassis system, the reliability of its connections directly affects driving safety and the overall performance of the vehicle. During the driving process, a car will continuously generate vibrations of varying degrees due to factors such as road conditions, engine operation, and the vehicle's own dynamic changes, which poses a severe test to the anti-loosening performance of chassis fasteners.

[0003] In existing technologies, some designs require pre-injecting adhesive into the threaded holes of components to prevent loosening before screwing in the screws. This necessitates carrying adhesive during connection, which is inconvenient and increases operational complexity. Utility Model Content

[0004] In view of the problems pointed out in the background art, this utility model proposes a self-locking automotive screw to solve the above-mentioned technical problems.

[0005] The technical solution of this utility model is implemented as follows:

[0006] A self-locking automotive screw includes a screw rod and a screw head. The screw rod has a receiving hole extending through its front end. A thin film bag containing glue is placed inside the receiving hole. The screw rod also includes a tubular extrusion tube. The outer diameter of the extrusion tube is equal to the diameter of the receiving hole, and the inner diameter of the extrusion tube is equal to or less than half the diameter of the receiving hole.

[0007] The present invention is further provided that the outer wall of the extrusion tube is provided with a glue outlet hole communicating with its interior.

[0008] The present invention is further configured such that a positioning disc is provided at the lower end of the extrusion tube, and the diameter of the positioning disc is equal to or smaller than the diameter of the screw.

[0009] The present invention is further configured such that the positioning disk has a plurality of through holes distributed thereon.

[0010] The present invention is further configured such that the film bag is cylindrical, and the length of the film bag is less than the length of the receiving hole.

[0011] The present invention is further provided with protrusions on the upper end surface of the extrusion tube.

[0012] The present invention is further provided that the inner side of the upper end of the extrusion tube is provided with a chamfer.

[0013] The present invention is further configured such that the length of the extrusion tube is less than the length of the receiving cavity.

[0014] The present invention is further provided that the inner side of the lower end of the screw is provided with a chamfer.

[0015] The present invention is further provided that the front end of the screw is provided with a wax seal to prevent the film bag from falling out.

[0016] By adopting the above technical solution, the beneficial effects of this utility model are as follows:

[0017] The self-locking automotive screw provided by this utility model is used by first inserting the extrusion tube into the threaded hole, and then screwing the screw into the threaded hole. As the screw is screwed in, the extrusion tube enters the receiving hole, punctures the film bag, and the glue inside the film bag flows out. As the extrusion tube continues to enter the receiving cavity, the glue is squeezed into the interior of the extrusion tube and flows out from the glue outlet on the extrusion tube. The glue enters the threaded hole. As the screw is gradually tightened, the glue enters between the screw and the threaded hole. After the glue cures, a self-locking structure is formed between the screw and the threaded hole.

[0018] Using the above technical solution, there is no need to carry extra glue or inject glue into the threaded hole, making the operation simpler. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of this utility model.

[0021] Figure 2 This is an exploded view of the present invention.

[0022] Figure 3 This is a cross-sectional view of the present invention.

[0023] Figure 4 This is a schematic diagram of the internal structure of this utility model.

[0024] The following are the labels in the attached diagram: 1. Screw; 2. Screw head; 3. Receiving hole; 4. Film bag; 5. Glue; 6. Extrusion tube; 7. Glue outlet; 8. Positioning plate; 9. Through hole; 10. Protrusion; 11. Chamfer 1; 12. Chamfer 2. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] For reference as follows Figures 1-4 The present invention will be described as follows:

[0027] Example: A self-locking automotive screw includes a screw 1 and a screw head 2. The screw 1 has a receiving hole 3 extending through its front end (the receiving hole 3 provides installation and movement space for a film bag 4 and a compression tube 6).

[0028] The receiving hole 3 is provided with a thin film bag 4, which contains glue 5 (its function is to store glue 5 when the screw is not in use, to prevent glue 5 from leaking or becoming contaminated in advance, and to ensure the effectiveness of glue 5).

[0029] It also includes a tubular extrusion tube 6, the outer diameter of which is equal to the diameter of the receiving hole 3 (ensuring that the extrusion tube 6 can smoothly enter and generate an extrusion effect therein). This dimensional design allows the extrusion tube 6 to make close contact with the hole wall when it enters the receiving hole 3, forming a closed extrusion space.

[0030] The inner diameter of the extrusion tube 6 is equal to or less than half the diameter of the receiving hole 3. The smaller inner diameter helps to increase the pressure of the glue 5 during extrusion, promoting the flow of the glue 5 from the dispensing hole 7.

[0031] The outer wall of the extrusion tube 6 is provided with a glue outlet 7 that communicates with its interior. The glue outlet 7 serves as a channel for the glue 5 to flow out, ensuring that the glue 5 can accurately enter between the screw 1 and the threaded hole.

[0032] In use, first insert the extrusion tube 6 into the threaded hole of the component to be connected, and then screw the screw 1 into the threaded hole. As the screw 1 is screwed in, the extrusion tube 6 gradually enters the receiving hole 3 of the screw 1. As the screw 1 continues to be screwed in, the extrusion tube 6 contacts and punctures the film bag 4 in the receiving hole 3, allowing the glue 5 inside the film bag 4 to be released.

[0033] As the screw 1 continues to screw in, the extrusion tube 6 further enters the receiving hole 3, compressing the glue 5 inside the receiving hole 3. Due to the tight fit between the extrusion tube 6 and the inner wall of the receiving hole 3, and the tubular structure of the extrusion tube 6 itself, the glue 5 enters the interior of the extrusion tube 6 under the pressure. As the extrusion continues, the glue 5 flows out from the glue outlet 7 on the extrusion tube 6 under pressure and enters the threaded hole.

[0034] As screw 1 is gradually tightened, the gap between screw 1 and the threaded hole gradually decreases, and the flowing glue 5 fills the space between screw 1 and the threaded hole under pressure. After the glue 5 cures, a strong adhesive structure is formed between the contact surfaces of screw 1 and the threaded hole, thus achieving self-locking between the two.

[0035] This technical solution eliminates the need for carrying the glue 5 separately in the traditional method by pre-encapsulating the glue 5 in a thin film bag 4 inside the screw 1, thus avoiding the usage limitations caused by the inconvenience of carrying the glue 5.

[0036] Meanwhile, during operation, there is no need for manual injection of glue 5 into the threaded hole. The release, flow, and filling of glue 5 are all automatically completed through the cooperation of screw 1 and extrusion tube 6 when screwed in. The entire operation process only requires screwing in the screw to achieve automatic application of glue 5, which simplifies the operation steps, reduces the difficulty of operation, and improves work efficiency.

[0037] The lower end of the extrusion tube 6 is equipped with a positioning plate 8, the diameter of which is equal to or slightly smaller than the diameter of the screw 1. This size setting allows the positioning plate 8 to form a good fit with the threaded hole. When the extrusion tube 6 is inserted into the threaded hole, the positioning plate 8 can accurately position the extrusion tube 6 based on its own fit with the threaded hole, ensuring that the extrusion tube 6 and the positioning plate 8 are coaxial with the threaded hole. This coaxiality ensures that the extrusion tube 6 is smoothly aligned and enters the receiving hole 3 when the screw 1 is screwed in, avoiding assembly obstruction or abnormal glue release caused by the misalignment of the extrusion tube 6.

[0038] The positioning plate 8 has several through holes 9. These through holes 9 break the obstruction of glue flow by the positioning plate 8. When the glue flows out of the glue outlet 7 of the extrusion tube 6, it can flow freely on both sides of the positioning plate 8 through the through holes 9, ensuring that the glue can fully fill all areas between the screw 1 and the threaded hole, ensuring the integrity and stability of the self-locking structure, and avoiding the formation of glue coverage blind spots due to the presence of the positioning plate 8.

[0039] The film bag 4 is cylindrical, and its length is less than the length of the receiving hole 3. The cylindrical structure allows it to fit more snugly within the receiving hole 3, reducing gaps with the hole wall and preventing shifting or shaking during screw transport or when not in use. The shorter length than the receiving hole 3 provides sufficient space for the extrusion tube 6 to enter the receiving hole 3, ensuring that the extrusion tube 6 can smoothly contact and puncture the film bag 4. It also allows space for the initial flow of adhesive within the receiving hole 3 after release, ensuring a smooth extrusion process.

[0040] The upper end face of the extrusion tube 6 is provided with protrusions 10. The presence of protrusions 10 significantly improves the efficiency and reliability of piercing the film bag 4. Compared with the planar structure of the upper end face of the extrusion tube 6, the protrusions 10 can concentrate stress, making it easier to break through the seal of the film bag 4 when the extrusion tube 6 comes into contact with the film bag 4, ensuring that the adhesive 5 can be accurately released at the predetermined stage, and avoiding the problem of delayed or incomplete adhesive release caused by the film bag 4 being difficult to pierce.

[0041] The inner side of the upper end of the extrusion tube 6 is provided with a chamfer 11. The chamfer 11 creates a larger glue inlet at the upper end of the extrusion tube 6. When the glue 5 is released from the punctured film bag 4, the larger inlet can guide the glue into the extrusion tube 6 more efficiently, reducing glue retention and accumulation at the inlet, increasing the speed and flow rate of glue entering the extrusion tube 6, and ensuring the continuity of glue flow from the glue outlet 7.

[0042] The length of the extrusion tube 6 is less than the length of the receiving hole 3. This design provides the space for the extrusion tube 6 to fully enter the receiving hole 3 and fully compress the adhesive. During the screw 1 screwing in, the extrusion tube 6 can continue to penetrate into the receiving hole 3 until the compression action of the adhesive is completed, ensuring that the adhesive can be fully squeezed out and avoiding the screw tightening operation being affected by the excessive length of the extrusion tube 6.

[0043] The inner side of the lower end of the screw 1 is provided with a chamfer 12. The chamfer 12 serves as a guide. When the screw 1 is screwed into the threaded hole and mates with the extrusion tube 6, the chamfer 12 can guide the upper end of the extrusion tube 6 to smoothly enter the receiving hole 3, reducing the difficulty of alignment when the two are mated, reducing friction and resistance during assembly, and making the process of the extrusion tube 6 entering the receiving hole 3 more stable and smooth.

[0044] The front end of the screw 1 is equipped with a wax seal to prevent the film bag 4 from falling out. When the screw is not in use, the wax seal effectively restrains the film bag 4 inside the receiving hole 3, preventing it from falling out of the front end of the receiving hole 3 and ensuring that the film bag 4 is always in the predetermined position, thus ensuring the safety and stability of the glue storage. At the same time, the wax seal does not affect the process of the extrusion tube 6 entering the receiving hole 3. It can be easily broken through by the extrusion tube 6 and does not constitute an obstacle to the normal assembly process.

[0045] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A self-locking automotive screw comprising a screw shank (1) and a screw head (2), characterized in that: The screw (1) has a receiving hole (3) that extends through its front end. A film bag (4) is provided inside the receiving hole (3), and glue (5) is contained in the film bag (4). It also includes a tubular extrusion tube (6), the outer diameter of which is equal to the diameter of the receiving hole (3), and the inner diameter of which is equal to or less than half the diameter of the receiving hole (3).

2. A self-locking automotive screw as claimed in claim 1, wherein: The outer wall of the extrusion tube (6) is provided with a glue outlet (7) that communicates with its interior.

3. The self-locking automotive screw according to claim 2, characterized in that: The lower end of the extrusion tube (6) is provided with a positioning plate (8), the diameter of which is equal to or less than the diameter of the screw (1).

4. A self-locking automotive screw according to claim 3, characterized in that: The positioning disk (8) has several through holes (9).

5. A self-locking automotive screw according to claim 1, characterized in that: The film bag (4) is cylindrical, and the length of the film bag (4) is less than the length of the receiving hole (3).

6. A self-locking automotive screw according to claim 1, characterized in that: The upper end face of the extrusion tube (6) is provided with protrusions (10).

7. A self-locking automotive screw according to claim 1, characterized in that: The inner side of the upper end of the extrusion tube (6) is provided with a chamfer (11).

8. A self-locking automotive screw according to claim 1, characterized in that: The length of the extrusion tube (6) is less than the length of the receiving hole (3).

9. A self-locking automotive screw according to claim 1, characterized in that: The screw (1) has a chamfer (12) on the inner side of its lower end.

10. A self-locking automotive screw according to claim 1, characterized in that: The front end of the screw (1) is provided with a wax seal to prevent the film bag (4) from falling out.

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