Anti-fatigue pin connecting structure

Abstract

The utility model provides an anti-fatigue pin connecting structure. The anti-fatigue pin connecting structure comprises a reinforcing pin and a special-shaped nut. The surface of the reinforced pin is smooth and is provided with a high-performance coating; the reinforcing pin comprises a pin head and a pin body; the diameter of the nail body is gradually reduced from the joint of the nail head to form a streamline surface; an external thread is arranged at the tail part of the nail body and is in threaded connection with the special-shaped nut; a hole is formed in the connecting piece and used for a pin body of the reinforcing pin to penetrate through. The structure stress concentration phenomenon is relieved, the anti-fatigue performance of the pin is improved, and the service life of the pin is prolonged.

Description

Technical Field

[0001] The utility model provides an anti-fatigue pin connection structure, belonging to the technical field of pins. Background Art

[0002] Most of the existing pin structures on aerospace aircraft include round head pins, flat head pins, etc., which are usually used for fixing and positioning, and stainless steel or aluminum alloy is mostly selected for materials. For some places, especially large-sized or inaccessible parts, the installation of pins may be relatively complex and require special tools or equipment. Moreover, once the pins are installed, disassembly and maintenance are relatively difficult, especially for parts that need to be replaced frequently. In addition, if the material is not properly selected, the pins are prone to corrosion in extreme environments, affecting the connection reliability. Under long-term vibration or stress cycling, the pins may experience fatigue failure, affecting the overall safety of the aircraft.

[0003] The existing pins mainly have the following disadvantages:

[0004] 1. Surface defects

[0005] Scratches and depressions: During the manufacturing, processing or transportation process, the surface of the pin may have defects such as scratches and depressions. These surface defects will become stress concentration points, making the pin prone to fatigue cracks under repeated loading, thereby affecting its long-term use reliability. Surface smoothness and integrity are crucial for improving fatigue life.

[0006] Corrosion: In a humid or corrosive environment, the surface of the pin may corrode. Corrosion not only directly weakens the strength of the material, but may also cause uneven structural changes on the surface, thereby reducing the fatigue life.

[0007] 2. Geometric defects

[0008] Irregular shape: If the shape design of the pin is irregular, it may lead to uneven stress. For example, sharp edges and uneven surfaces may increase the stress in certain areas, thereby causing early failure. Utility Model Content

[0009] In view of the above technical problems, the utility model provides an anti-fatigue pin connection structure to relieve the phenomenon of structural stress concentration, improve its anti-fatigue performance, and increase the service life of the pin.

[0010] The specific technical solution is as follows:

[0011] An anti-fatigue pin connection structure includes a reinforced pin and a special-shaped nut; the surface of the reinforced pin is smooth and provided with a high-performance coating;

[0012] The enhanced pin described above includes a pin head and a pin body; starting from the connection with the pin head, the diameter of the pin body gradually decreases to form a streamlined surface; the tail of the pin body is provided with an external thread for threaded connection with a special-shaped nut;

[0013] The connecting piece is provided with a hole for the pin body of the enhanced pin to pass through.

[0014] The hole of the connecting piece is provided with a round chamfer to cooperate with the pin body of the enhanced pin.

[0015] It also includes a washer, and the washer is located between the connecting piece and the special-shaped nut.

[0016] The present utility model has a reasonable shape design, which increases the surface smoothness and integrity, so as to effectively disperse the stress, reduce the stress concentration, significantly reduce the surface defects such as scratches and depressions, reduce the number of stress concentration points, significantly improve the performance and service life of the pin, and ensure its safety and reliability in various engineering applications. Description of the Drawings

[0017] Figure 1 It is a schematic cross-sectional structure diagram of the present utility model. Detailed Embodiment

[0018] As Figure 1 shown, it is a schematic cross-sectional structure diagram of a pin connection structure for anti-fatigue, including an enhanced pin 1, a connecting piece 2, a washer 3 and a special-shaped nut 4. The enhanced pin 1 includes a pin head and a pin body; starting from the connection with the pin head, the diameter of the pin body gradually decreases to form a streamlined surface; the tail of the pin body is provided with an external thread for threaded connection with the special-shaped nut 4;

[0019] The connecting piece 2 is provided with a hole for the pin body of the enhanced pin 1 to pass through. The hole of the connecting piece 2 is provided with a round chamfer to cooperate with the pin body of the enhanced pin 1. It also includes a washer 3, and the washer 3 is located between the connecting piece 2 and the special-shaped nut 4.

[0020] The enhanced pin 1 is made of a high-strength and corrosion-resistant titanium alloy material, and its performance is improved through a heat treatment process to ensure reliability under extreme conditions.

[0021] In order to improve the anti-fatigue ability of the pin, a streamlined outer shape is adopted in the design, which significantly reduces the stress concentration and avoids the potential risks brought by sharp edges. At the same time, the pin body of the enhanced pin 1 adopts a gradually changing diameter design to optimize the stress distribution and further enhance its load-bearing capacity. To improve the anti-wear and anti-corrosion performance, the enhanced pin 1 is hardened and a high-performance coating is adopted. In addition, the surface roughness after shot peening treatment has been significantly improved, thus effectively reducing the risk of fatigue crack generation.

[0022] Around the hole of the connector 2, a round chamfer is designed to relieve the stress concentration caused by the overall vibration of the system, thereby further improving the reliability of the connection. At the same time, a threaded structure is designed at the tail of the pin 1 to make the disassembly and assembly processes more convenient and improve the maintenance efficiency. The mating design of the special-shaped nut 4 and the washer 3 effectively prevents loosening caused by vibration, thus ensuring the structural stability.

[0023] Combining the above design features, the anti-fatigue pin connection structure not only improves the anti-fatigue performance but also significantly enhances the overall safety and reliability of the system.

Claims

1. An anti-fatigue pin connection structure, characterized in that It includes a reinforcing pin (1) and a special-shaped nut (4); the surface of the reinforcing pin (1) is smooth and provided with a high-performance coating; The reinforcing pin (1) includes a nail head and a nail body; starting from the connection with the nail head, the diameter of the nail body gradually becomes smaller, forming a streamlined surface; an external thread is provided at the tail of the nail body, which is threadedly connected to the special-shaped nut (4); The connecting piece (2) is provided with a hole for the nail body of the reinforcing pin (1) to pass through.

2. The anti-fatigue pin connection structure according to claim 1, wherein, The hole of the connecting piece (2) is provided with a circular chamfer to cooperate with the nail body of the reinforcing pin (1).

3. The anti-fatigue pin connection structure according to claim 1, characterized in that, It further includes a washer (3), and the washer (3) is located between the connecting piece (2) and the special-shaped nut (4).

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