Self-tapping screw
By optimizing the thread shape angle and transition surface design in the self-tapping screw, the problems of difficulty in attack, easy sliding teeth and poor tightening effect of traditional self-tapping screws are solved, and better cutting attack performance and tightening effect are achieved.
Patent Information
- Application Number
- CN202421712502.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-18
- Publication Date
- 2025-05-06
- Estimated Expiration
- 2034-07-18
AI Technical Summary
When the existing self-tapping screws are attacked, due to the unreasonable design of the threaded teeth angle, the attack torque is large, the self-tapping effect is poor, and even the sliding teeth are caused, and the tightening effect is poor.
A self-tapping screw is designed, with the tooth shape angle α of the threads ranging from 41° to 54°, and a first transition surface and a second transition surface are provided on the threads to form an angle β, and the nail rod structure is optimized to reduce stress concentration.
By optimizing the threaded tooth angle and transition surface design, the resistance during attack is reduced, the self-attack performance and tightening effect are improved, the sliding teeth phenomenon is avoided, and the service life is extended.
Smart Images
Figure CN222836032U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of fasteners, and in particular to a self-tapping screw. Background Art
[0002] Self-tapping screws are a type of fastener widely used in the fields of construction, furniture, and electrical appliances. They can be screwed directly into the material to be connected without pre-drilling holes to achieve a fastened connection. There are many types of self-tapping screws available, but there are still some problems in actual use, such as difficulty in tapping, easy slipping, and poor fastening effect. Therefore, how to design a self-tapping screw with good self-tapping performance and good fastening effect is an urgent problem to be solved by those skilled in the art.
[0003] When traditional self-tapping screws are driven in, due to the unreasonable design of the thread angle, it often leads to a large driving torque, poor self-tapping effect, and even slipping. Therefore, it is necessary to improve the traditional self-tapping screws to solve the above problems. Utility Model Content
[0004] The present application provides a self-tapping screw, which can make the self-tapping screw have better cutting and penetration performance.
[0005] In the first aspect, the present application provides a self-tapping screw adopting the following technical solution:
[0006] A self-tapping screw comprises a nail head and a nail rod. The nail head is provided with a matching groove for transmitting torque. The nail rod is connected to the nail head. The nail rod is provided with a thread. The thread angle α is 41° to 54°.
[0007] By adopting the above technical solution and setting a smaller tooth angle, when using a tool to tighten the screw, it has better cutting performance, and the user can use less force (less torque is required) to make the screw more smoothly penetrate into the fixed material.
[0008] Optionally, a first transition surface and a second transition surface are provided between the threads of the thread, and the first transition surface and the second transition surface are symmetrically distributed to form an angle β.
[0009] By adopting the above technical solution, a receiving groove with an angle is formed between the first transition surface and the second transition surface. When the screw is penetrated into the fixed material, the part of the fixed material that has entered to the point where the thread is scratched and deformed can further enter the receiving groove, thereby further engaging with the self-tapping screw and preventing the self-tapping screw from loosening.
[0010] Optionally, the angle β is 150° to 160°.
[0011] By adopting the above technical solution and setting a larger angle β, the stability of the nail rod structure is ensured and the nail rod is prevented from breaking.
[0012] Optionally, the nail rod includes a connecting portion and a leading portion, the nail head, the connecting portion and the leading portion are connected end to end in sequence, and the leading portion gradually decreases in diameter in a direction away from the nail head.
[0013] By adopting the above technical solution, when the screw strikes the material to be fixed, the leading portion enters the material to be fixed first and is cone-shaped, so it can penetrate the material to be fixed and be screwed into the material to be fixed better.
[0014] Optionally, an end of the nail rod close to the nail head transitions smoothly to the nail head.
[0015] By adopting the above technical solution, the stress concentration generated after the screw is driven into the fixed material is reduced, and the overall strength of the self-tapping screw is improved.
[0016] Optionally, a rounded corner is provided at one end of the nail head away from the nail rod.
[0017] By adopting the above technical solution, it is possible to prevent the connected materials from being scratched during the screwing process and help reduce the penetration resistance.
[0018] Optionally, the matching groove is in an inner hexagonal shape or a plum blossom shape.
[0019] By adopting the above technical solution, it can be matched with an Allen wrench or a Torx screwdriver, thereby better transmitting torque and ensuring that the self-tapping screw can fix the fixed material more smoothly.
[0020] Optionally, the outer surface of the nail rod is coated with a wear-resistant coating.
[0021] By adopting the above technical solution, the wear resistance of the nail rod is improved and the service life of the self-tapping screw is extended.
[0022] In summary, the present application includes at least one of the following beneficial technical effects:
[0023] 1. Since the present invention adopts a thread design with a tooth angle α of 41° to 54°, the resistance during penetration is reduced, the self-tapping performance is improved, and a better fastening effect is obtained.
[0024] 2. The present invention preferably adopts the design of the first transition surface and the second transition surface. Due to the formation of a certain angle β, the thread can better adapt to the deformation of the connected material when screwing in, further improving the fastening effect of the self-tapping screw, thereby preventing the self-tapping screw from loosening. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] Figure 1 It is a schematic diagram of the planar structure of the self-tapping screw in Example 1 of the present application;
[0026] Figure 2 It is a partial structural schematic diagram of the self-tapping screw in Example 1 of the present application;
[0027] Figure 3 is a schematic diagram of the planar structure of the self-tapping screw in Example 3 of the present application;
[0028] Figure 4 It is a partial structural schematic diagram of the self-tapping screw in Example 3 of the present application;
[0029] In the figure, 1, nail head; 11, matching groove; 2, nail rod; 21, connecting part; 22, leading part; 3, thread; 4, first transition surface; 5, second transition surface; 6, wear-resistant coating. DETAILED DESCRIPTION
[0030] The following is combined with Figure 1 -Attached Figure 4 , further details of this application are given.
[0031] Embodiment 1:
[0032] A self-tapping screw, referring to Figure 1 and Figure 2 , including a nail head 1 and a nail rod 2, the nail rod 2 is connected to the nail head 1, and a thread 3 is provided on the nail rod 2, and the nail head 1 is provided with a matching groove 11, and the matching groove 11 is used to transmit torque, and can better cooperate with tools (such as screwdrivers, wrenches). When performing self-tapping action, the tool is used to twist the automatic screw so that the self-tapping screw is screwed into the connected material to achieve a fastened connection.
[0033] The mating groove 11 is in the shape of an inner hexagon or a plum blossom. In the present embodiment, the mating groove 11 is in the shape of an inner hexagon, and the user can use an inner hexagon wrench to match with the mating groove 11. In another embodiment, the mating groove 11 can also be set to a plum blossom shape to match with a plum screwdriver. In other embodiments, the shape of the mating groove 11 can also be customized according to actual production needs to ensure that the tool can be used to tighten the screw.
[0034] Furthermore, the nail rod 2 includes a connecting portion 21 and a leading portion 22, which are sequentially connected to the nail head 1. The leading portion 22 is uniquely designed, and its diameter gradually decreases in the direction away from the nail head 1, so that the self-tapping screw can be screwed in more smoothly and the penetration resistance is reduced. At the same time, this gradually decreasing diameter design can also make the self-tapping screw gradually compress the connected material during the screwing process, thereby improving the fastening effect.
[0035] In order to enhance the durability of the self-tapping screw, the outer surface of the nail rod 2 is coated with a wear-resistant coating 6, which can be made of wear-resistant materials such as ceramic coating and metal coating, aiming to improve the wear resistance of the nail rod 2 and extend the service life of the self-tapping screw.
[0036] Structurally, a smooth transition design is adopted between the end of the nail rod 2 close to the nail head 1 and the nail head 1, which not only reduces stress concentration and improves the overall strength of the self-tapping screw, but also makes the self-tapping screw smoother when screwed in. The end of the nail head 1 away from the nail rod 2 is provided with a rounded corner to prevent scratching of the connected materials during the screwing process and help reduce the penetration resistance.
[0037] Further, refer to Figure 1 The thread 3 is a continuous spiral structure, which makes the self-tapping screw more stable when screwed in, less prone to slipping, and improves the fastening effect to prevent loosening. The tooth angle α of the thread 3 is designed to be 41° to 54°, and the angle of the tooth angle is relatively small. In this embodiment, the tooth angle α of the thread 3 is designed to be 45°. When using a tool to tighten the screw, the user can use less force (less torque is required) to drive the screw into the fixed material.
[0038] The implementation principle of Example 1 of the present application is: by rationally designing the structure of the self-tapping screw, including the shape of the matching groove 11 of the nail head 1, the angle and shape of the thread 3 on the nail rod 2, and the special structure of the nail rod 2, the problems of the traditional self-tapping screw in terms of difficulty in tapping, easy slipping of the threads, and poor fastening effect are solved. These innovative designs jointly improve the performance and use effect of the self-tapping screw, making it more convenient, efficient and safe in practical applications.
[0039] Embodiment 2:
[0040] The difference between the second embodiment and the first embodiment is that the tooth angle α of the thread 3 is larger than that of the first embodiment. Specifically, in the second embodiment, the tooth angle α is designed to be 50°.
[0041] The implementation principle of Example 2 of the present application is: by increasing the tooth angle α, the stress distribution is more uniform when the screw automatically enters the fixed material.
[0042] Embodiment 3:
[0043] Reference Figure 3 and Figure 4 The difference between this embodiment 3 and the above embodiments is that the self-tapping screws in embodiments 1 and 2 are set to have a flat bottom, while the self-tapping screws in this embodiment are set to have an inclined bottom, that is, the nail rod 2 part is further improved.
[0044] Specifically, a first transition surface 4 and a second transition surface 5 are provided between the threads of the thread 3. The first transition surface 4 and the second transition surface 5 are symmetrically distributed and form an angle β. By setting the angle β, the screw can better adapt to the deformation of the connected material and prevent the screw from loosening after entering the fixed material, thereby optimizing the fastening effect.
[0045] Furthermore, the angle β is designed to be 150° to 160°. In this embodiment, the angle β is designed to be 160°.
[0046] The implementation principle of Example 3 of the present application is: by setting the first transition surface 4 and the second transition surface 5, an angle β is formed, so that when the self-tapping screw penetrates into the fixed material, it adapts to the fluidity of the part of the fixed material that is squeezed after the fixed material is deformed and punctured, that is, the fixed material that is deformed and squeezed can enter the groove formed between the first transition surface 4 and the second transition surface 5, so that the screw and the fixed material are further engaged, thereby preventing the screw from loosening.
[0047] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.
Claims
1. A self-tapping screw, characterized in that: include: The nail head (1) is provided with a matching groove (11) for transmitting torque; A nail rod (2) is connected to the nail head (1); a thread (3) is provided on the nail rod (2); and a tooth angle α of the thread (3) is 41° to 54°.
2. A self-tapping screw according to claim 1, characterized in that: A first transition surface (4) and a second transition surface (5) are provided between the threads of the thread (3); the first transition surface (4) and the second transition surface (5) are symmetrically distributed to form an angle β.
3. A self-tapping screw according to claim 2, characterized in that: The angle β is 150° to 160°.
4. A self-tapping screw according to claim 1, characterized in that: The nail rod (2) comprises a connecting portion (21) and a leading portion (22); the nail head (1), the connecting portion (21) and the leading portion (22) are connected end to end in sequence; and the leading portion (22) gradually decreases in diameter in a direction away from the nail head (1).
5. A self-tapping screw according to claim 1, characterized in that: An end of the nail rod (2) close to the nail head (1) transitions smoothly to the nail head (1).
6. A self-tapping screw according to claim 5, characterized in that: One end of the nail head (1) facing away from the nail rod (2) is provided with a rounded corner.
7. A self-tapping screw according to claim 1, characterized in that: The matching groove (11) is in the shape of an inner hexagon or a plum blossom.
8. The self-tapping screw according to claim 1, characterized in that: The outer surface of the nail rod (2) is coated with a wear-resistant coating (6).