High-strength automobile screw

Abstract

The utility model relates to the technical field of automobile parts, and discloses a high-strength automobile screw which comprises a screw bottom plate, a screw head is fixed to the side wall of the screw bottom plate, a screw rod is fixed to the other side wall of the screw bottom plate and is of a double-thread structure, one side of the screw rod is connected with a nut through threads, and the nut is connected with the screw head through threads. A locking nut is connected to the portion, on one side of the nut, outside the screw rod through threads, and a nylon insert is fixed to one side of the locking nut. The nut and the locking nut are sequentially screwed on the screw rod and locked with each other, the nut and the locking nut can be effectively prevented from automatically loosening during vibration, impact or long-term use through friction force generated by mutual screwing and axial pressure on the screw rod, and compared with a single nut, the anti-loosening nut has higher anti-loosening reliability.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts technology, and more specifically, to a high-strength automotive screw. Background Technology

[0002] During vehicle operation, the reliability of screw connections is crucial. Traditional automotive screws have some shortcomings when facing complex working conditions. Vehicles experience continuous vibrations during driving, especially in areas like the engine and chassis where the vibration amplitude is significant. This vibration subjects the screws to alternating stress, which over time can cause them to loosen. Once a screw loosens, it not only affects the stability of the connection between components but may also cause relative displacement between components, thus affecting the normal operation of the vehicle and, in severe cases, even leading to safety accidents.

[0003] While some anti-loosening measures exist on the market, such as the use of spring washers and thread-locking agents, these methods have certain limitations in practical applications. Spring washers gradually weaken under long-term vibration, and thread-locking agents are difficult to disassemble and may damage the threads. Therefore, we have designed a high-strength automotive screw. Utility Model Content

[0004] In order to overcome the shortcomings of the prior art, this utility model provides a high-strength automotive screw to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a high-strength automotive screw, comprising a screw base plate, a screw head fixed to the side wall of the screw base plate, a screw rod fixed to the other side wall of the screw base plate, and the screw rod having a double-threaded structure, a nut being threadedly connected to one side of the screw rod, a locking nut being threadedly connected to the outside of the screw rod on the side of the nut, and a nylon insert being fixed to one side of the locking nut.

[0006] In a preferred embodiment of this invention, the screw is made of CrMo alloy steel.

[0007] As a preferred technical solution of this utility model, the screw surface is coated with a double-layer zinc-chromium coating.

[0008] As a preferred embodiment of this utility model, the screw head sidewall is provided with anti-slip texture.

[0009] As a preferred embodiment of this utility model, a spring washer is placed on one side of the screw base plate.

[0010] In a preferred embodiment of this invention, the height of the locking nut is greater than the height of the nut.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0012] 1. This utility model involves sequentially screwing a nut and a locking nut onto a screw and locking them together. The friction generated by the tightening of the nut and the locking nut, along with the axial pressure on the screw, effectively prevents the nut from loosening during vibration, impact, or long-term use. Compared to a single nut, this method offers higher reliability in preventing loosening.

[0013] 2. This utility model utilizes the nylon insert to generate elastic deformation during the screw tightening process, which tightly grips the screw thread, thereby generating greater frictional force and effectively preventing the locking nut from loosening under external forces such as vibration and impact. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of a high-strength automotive screw according to the present invention;

[0015] Figure 2 This is a front view schematic diagram of a high-strength automotive screw according to the present invention.

[0016] In the diagram: 1. Screw base plate; 2. Screw; 3. Screw head; 4. Spring washer; 5. Nut; 6. Locking nut; 7. Nylon insert. Detailed Implementation

[0017] 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.

[0018] like Figures 1 to 2 As shown, this utility model provides a high-strength automotive screw, including a screw base plate 1, a screw head 3 fixed to the side wall of the screw base plate 1, and anti-slip texture on the side wall of the screw head 3. A screw rod 2 is fixed to the other side wall of the screw base plate 1, and the screw rod 2 has a double-thread structure. The lead of the double-thread is twice that of the single-thread. Under the same number of tightening turns, the double-thread can generate a greater axial force, making the connection between the screw and the nut tighter. The thread angle of the double-thread is designed to be 60°, which improves the self-locking performance of the thread while ensuring the thread load-bearing capacity, and effectively prevents the screw from loosening in a vibration environment.

[0019] A nut 5 is threadedly connected to one side of the screw 2, and a locking nut 6 is threadedly connected to the outside of the screw 2 on the side of the nut 5. A nylon insert 7 is fixed to one side of the locking nut 6. By screwing the nut 5 and the locking nut 6 onto the screw 2 in sequence and locking them together, the friction generated by the tightening of the nut 5 and the locking nut 6 and the axial pressure on the screw 2 can effectively prevent the nut 5 from loosening on its own during vibration, impact or long-term use. The nylon insert 7 will generate elastic deformation during the tightening of the screw, tightly holding the threads of the screw 2, thereby generating a large friction force and effectively preventing the locking nut 6 from loosening under the action of external forces such as vibration and impact.

[0020] The screw 2 is made of 35CrMo alloy steel, with a double-layer zinc-chromium coating on its surface. 35CrMo alloy steel has excellent comprehensive mechanical properties, with a tensile strength of over 1000MPa and a yield strength of around 850MPa, which can meet the connection requirements of various automotive components under high load conditions. Adding appropriate amounts of alloying elements such as chromium (Cr) and molybdenum (Mo) to the steel can effectively improve its hardenability, tempering stability, and corrosion resistance. Chromium can form a dense oxide film on the steel surface, enhancing its oxidation and corrosion resistance. Molybdenum can refine the grains, improving the strength and toughness of the steel, making the screw less prone to deformation and breakage under high loads. The zinc and chromium elements in the zinc-chromium coating can form a dense protective film on the surface of the screw 2, effectively blocking air, moisture, and other corrosive media from contacting the screw 2 substrate, thereby significantly improving the corrosion resistance of the screw 2.

[0021] Among them, a spring washer 4 is placed on one side of the screw base plate 1. The spring washer 4 can effectively prevent the nut 5 from loosening to a certain extent. Especially in some situations with vibration or impact, such as mechanical equipment and automobiles, the spring washer 4 can provide additional fastening force and increase the reliability of the connection.

[0022] The height of the locking nut 6 is greater than that of the nut 5. The larger locking nut 6 can withstand a larger torque and is used for initial tightening and providing a larger preload. The smaller nut 5 is used for fine adjustment of the preload. By first tightening the larger locking nut 6 to a certain extent and then using the smaller nut 5 for fine adjustment, the preload of the bolt 2 connection can be controlled more accurately, ensuring the reliability of the connection.

[0023] The working principle and usage process of this utility model are as follows: By screwing the nut 5 and the locking nut 6 onto the screw rod 2 in sequence and locking them together, the friction generated by the mutual tightening of the nut 5 and the locking nut 6 and the axial pressure on the screw rod 2 can effectively prevent the nut 5 from loosening on its own during vibration, impact or long-term use. Compared with a single nut 5, it has higher anti-loosening reliability. The nylon insert 7 will generate elastic deformation during the screw rod tightening process, tightly holding the thread of the screw rod 2, thereby generating a large friction force, effectively preventing the locking nut 6 from loosening under the action of external forces such as vibration and impact.

[0024] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0025] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art 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 appended claims and their equivalents.

Claims

1. A high-strength automobile screw comprising a screw base plate (1), characterized in that: The screw base plate (1) is fixed with a screw head (3) on one side wall, and is fixed with a screw rod (2) on the other side wall, and the screw rod (2) is a double thread structure, one side of the screw rod (2) is connected with a nut (5) through threads, the outer side of the screw rod (2) on one side of the nut (5) is connected with a locking nut (6) through threads, and one side of the locking nut (6) is fixed with a nylon insert (7).

2. The high-strength automotive screw according to claim 1, wherein: The screw rod (2) is made of 35CrMo alloy steel.

3. The high-strength automotive screw of claim 1, wherein: The surface of the screw rod (2) is plated with a double-layer zinc-chromium coating.

4. The high-strength automotive screw of claim 1, wherein: The screw head (3) is provided with anti-skid lines on the side wall.

5. The high-strength automotive screw of claim 1, wherein: The screw base plate (1) is placed with a spring washer (4) on one side.

6. The high-strength automotive screw of claim 1, wherein: The height of the locking nut (6) is greater than the height of the nut (5).

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