A resilient locking screw
Patent Information
- Application Number
- CN202522202168.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-17
- Publication Date
- 2026-09-22
- Estimated Expiration
- 2035-10-17
AI Technical Summary
弹簧垫圈：通过弹性变形增加摩擦力，但长期使用后弹性衰减，且在高频振动下易失效；双螺母：依赖螺母间的摩擦力，但装配复杂，且对空间要求高；化学胶粘剂：需固化时间，拆卸困难，且存在环境污染风险
本实用新型在引导段和自锁段外端自锁螺纹的作用下，杆部会顺利旋入螺纹孔。随着杆部的旋入，弹性形变段会逐渐受到径向挤压而发生收缩形变，并因此产生弹性势能。当振动导致杆部出现松动趋势时，弹性形变段会释放之前储存的弹性势能，径向膨胀填补螺纹间隙，并形成自锁力。通过在杆部上设置弹性形变段，并配合变形引导槽和自锁螺纹的设计，实现了无需辅助件的主动防松功能。
Smart Images
Figure CN224786155U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of fastener technology, and in particular to a flexible anti-loosening screw. Background Technology
[0002] In existing technologies, threaded connections are prone to loosening due to vibration, impact, or thermal expansion and contraction. Traditional anti-loosening methods often rely on external auxiliary components, such as washers, adhesives, or material properties. Spring washers increase friction through elastic deformation, but their elasticity diminishes over long-term use and they are prone to failure under high-frequency vibration; double nuts rely on the friction between the nuts, but assembly is complex and requires ample space; chemical adhesives require curing time, are difficult to disassemble, and pose environmental pollution risks. Utility Model Content
[0003] The technical problem to be solved by this utility model is to overcome the defects of the existing technology. This utility model proposes an elastic anti-loosening screw.
[0004] To address the issues raised by traditional anti-loosening methods, which often rely on external auxiliary components such as washers, adhesives, or material properties, this invention offers the following solutions: Spring washers increase friction through elastic deformation, but their elasticity diminishes over time and they are prone to failure under high-frequency vibration; Double nuts rely on the friction between the nuts, but assembly is complex and requires ample space; Chemical adhesives require curing time, are difficult to disassemble, and pose environmental pollution risks. A resilient anti-loosening screw includes: an end and a shank; The rod is provided with a guide section, an elastic deformation section and a self-locking section from bottom to top; The outer surfaces of the guide section and the self-locking section are both provided with self-locking threads. The outer surfaces of the self-locking threads are coated with a composite coating, which is used to increase the friction coefficient between the threads. The elastic deformation section is embedded in the lower end of the rod. The elastic deformation section adopts an elastic cavity structure design. The outer cross section of the elastic deformation section is wavy. The elastic deformation section is used to contract and deform when subjected to radial compression and generate elastic potential energy.
[0005] Preferably, the end is fixedly connected to the top of the rod.
[0006] Preferably, the bottom of the guide section has a rounded corner, and the tooth profile of the self-locking thread is triangular.
[0007] Preferably, the composite coating is a molybdenum disulfide solid lubricant coating, a polytetrafluoroethylene composite coating, a nanodiamond / graphite composite coating, an epoxy resin-metal powder composite coating, or a ceramic-metal composite coating.
[0008] Preferably, the wave height of the elastic deformation section is set to 0.3-0.6 times the thread height of the self-locking thread portion, and the elastic deformation section is made of spring steel.
[0009] Preferably, the rod is provided with two deformation guide grooves, which are located at the junction of the elastic deformation section, the self-locking section and the guide section, respectively.
[0010] Compared with the prior art, the beneficial effects of this utility model are: This invention utilizes the self-locking threads at the outer ends of the guide section and the self-locking section to smoothly screw the rod into the threaded hole. As the rod screws in, the elastic deformation section gradually contracts under radial compression, generating elastic potential energy. When vibration causes the rod to loosen, the elastic deformation section releases its previously stored elastic potential energy, expands radially to fill the thread gap, and forms a self-locking force. By incorporating an elastic deformation section on the rod, along with a deformation guide groove and a self-locking thread, an active anti-loosening function without auxiliary components is achieved. Attached Figure Description
[0011] The disclosure of this utility model is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. In the drawings, the same reference numerals are used to refer to the same parts. Wherein: Figure 1 This is a schematic diagram of the overall structure of this utility model.
[0012] Figure 2 This is a cross-sectional view of the overall structure of this utility model.
[0013] Reference numerals: 1. End; 2. Rod; 3. Guide section; 4. Elastic deformation section; 5. Self-locking section; 6. Deformation guide groove. Detailed Implementation
[0014] It is readily understood that, based on the technical solution of this utility model, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of this utility model. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative descriptions of the technical solution of this utility model and should not be considered as the entirety of this utility model or as limitations or restrictions on the technical solution of this utility model.
[0015] The specific embodiments of this utility model are described below with reference to the accompanying drawings.
[0016] Please see Figure 1 - Figure 2 In this embodiment, a resilient anti-loosening screw is proposed. The screw mainly consists of an end portion 1 and a shank portion 2, wherein the end portion 1 is securely connected to the top of the shank portion 2 by welding or integral molding process, ensuring that the shank portion 2 can be rotated synchronously when the end portion 1 is rotated.
[0017] The rod 2 is designed with a guide section 3, an elastic deformation section 4, and a self-locking section 5 from bottom to top. The bottom of the guide section 3 has a rounded corner, which facilitates the precise alignment of the guide section 3 with the threaded hole to be fitted. The outer surfaces of both the guide section 3 and the self-locking section 5 are provided with self-locking threads, and the tooth profile of the self-locking threads is triangular, which effectively increases the contact area and improves the anti-loosening effect.
[0018] The outer surface of the self-locking thread is also coated with a composite coating, which significantly increases the coefficient of friction between the threads, thereby greatly improving its anti-loosening performance without sacrificing the normal assembly function of the screw. Optional composite coatings include, but are not limited to, molybdenum disulfide solid lubricant coatings, polytetrafluoroethylene composite coatings, nanodiamond / graphite composite coatings, epoxy resin-metal powder composite coatings, and ceramic-metal composite coatings.
[0019] Specifically, molybdenum disulfide solid lubricant coatings have an extremely low coefficient of friction, effectively reducing thread wear and extending service life. They also possess excellent high-temperature resistance (up to 350℃ for short periods and 250℃ for long periods), making them ideal for high-temperature environments such as engines and exhaust systems. Furthermore, they exhibit high chemical stability and resistance to acid and alkali corrosion. Polytetrafluoroethylene (PTFE) composite coatings are renowned for their excellent self-lubricating properties, significantly reducing the risk of thread jamming. They also possess excellent low-temperature resistance (-200℃) and chemical corrosion resistance (except for molten alkali metals). Additionally, their good biocompatibility makes them ideal for medical devices. Nanodiamond / graphite composite coatings combine the extremely high hardness of nanodiamonds (HV≥8000) with the lubricating properties of graphite layers, significantly improving wear resistance and reducing wear rates. Furthermore, they possess high-temperature resistance (>600℃), making them ideal for aerospace engines. Epoxy resin-metal powder composite coatings are favored for their low cost and simple process (curing after spraying or brushing); they can also be filled with conductive particles (such as silver powder) to achieve electromagnetic shielding; at the same time, they have excellent water resistance and salt spray resistance. Ceramic-metal composite coatings stand out for their extremely high hardness (HV≥2000) and excellent wear resistance (more than 10 times that of steel); they also have high temperature resistance (>1000℃), making them very suitable for extreme environments such as gas turbines and rocket engines; at the same time, they maintain a low coefficient of friction while resisting oxidation. These composite coatings enable self-locking threads to flexibly adapt to the needs of different application scenarios.
[0020] The elastic deformation section 4 is embedded in the lower end of the rod 2. It adopts an elastic cavity structure design with a wave-shaped distribution at its outer end. The wave height of the elastic deformation section 4 is set to 0.3-0.6 times the thread height of the self-locking thread section, and it is made of spring steel. This design allows the elastic deformation section 4 to undergo contraction deformation and generate elastic potential energy when subjected to radial compression.
[0021] Please continue reading. Figure 1 - Figure 2 In this embodiment, deformation guide grooves 6 are also formed on the rod 2. There are two deformation guide grooves 6, located at the junctions of the elastic deformation section 4, the self-locking section 5, and the guide section 3, respectively. These deformation guide grooves 6 are designed in a ring shape, so that under the action of axial force, the junctions of the elastic deformation section 4, the self-locking section 5, and the guide section 3 can preferentially undergo contraction deformation through the guidance of the deformation guide grooves 6.
[0022] In practical use, simply align the bottom of rod 2 with the threaded hole to be fastened, and then use an external tool to rotate rod 2 using end 1. Under the action of the self-locking threads at the outer end of guide section 3 and self-locking section 5, rod 2 will smoothly screw into the threaded hole. As rod 2 screws in, elastic deformation section 4 will gradually be radially compressed and undergo contraction deformation, thus generating elastic potential energy. When vibration causes rod 2 to loosen, elastic deformation section 4 will release the previously stored elastic potential energy, expand radially to fill the thread gap, and form a self-locking force. By setting elastic deformation section 4 on rod 2, and combining it with the design of deformation guide groove 6 and self-locking threads, an active anti-loosening function without auxiliary parts is achieved.
[0023] The technical scope of this utility model is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this utility model, and all such modifications and variations should fall within the protection scope of this utility model.
Claims
1. A resilient anti-loosening screw, characterized in that, include: Ends and rod sections; The rod is provided with a guide section, an elastic deformation section and a self-locking section from bottom to top; The outer surfaces of the guide section and the self-locking section are both provided with self-locking threads. The outer surfaces of the self-locking threads are coated with a composite coating, which is used to increase the friction coefficient between the threads. The elastic deformation section is embedded in the lower end of the rod. The elastic deformation section adopts an elastic cavity structure design. The outer cross section of the elastic deformation section is wavy. The elastic deformation section is used to contract and deform when subjected to radial compression and generate elastic potential energy.
2. The elastic anti-loosening screw according to claim 1, characterized in that, The end is fixedly connected to the top of the rod.
3. The elastic anti-loosening screw according to claim 2, characterized in that, The bottom of the guide section has a rounded corner, and the tooth profile of the self-locking thread is triangular.
4. The elastic anti-loosening screw according to claim 3, characterized in that, The composite coating is a molybdenum disulfide solid lubricant coating, a polytetrafluoroethylene composite coating, a nanodiamond / graphite composite coating, an epoxy resin-metal powder composite coating, or a ceramic-metal composite coating.
5. The elastic anti-loosening screw according to claim 4, characterized in that, The wave height of the elastic deformation section is set to 0.3-0.6 times the thread height of the self-locking thread section, and the elastic deformation section is made of spring steel.
6. The elastic anti-loosening screw according to claim 1, characterized in that, The rod is provided with two deformation guide grooves, which are located at the junction of the elastic deformation section, the self-locking section and the guide section, respectively.