Fatigue-resistant bolted joint structure

Abstract

This utility model relates to the field of bolt technology and provides a fatigue-resistant bolt connection structure, including a nut and an anti-loosening structure. A connecting block is fixed to the bottom end of the nut, a screw is installed at the bottom end of the connecting block, a nut is installed on the outside of the screw, and a washer is fixed to one end of the nut on the outside of the screw. A buffer structure is provided inside the connecting block, and an anti-loosening structure is provided inside the screw. This utility model, by providing an anti-loosening structure, allows the nut to be installed on the outside of the screw. When the rotating block's pin moves to the inside of the nut, the pin engages with the annular groove under the elastic force of the telescopic spring, further securing the nut and preventing it from loosening, thereby further improving the bolt's fatigue resistance.

Description

Technical Field

[0001] This utility model relates to the field of bolt technology, and in particular to a fatigue-resistant bolt connection structure. Background Technology

[0002] Bolts are a common type of mechanical fastener, mainly used to connect two or more parts with through holes. They are usually used in conjunction with nuts. By tightening the nut, a preload is generated, which presses the connected parts together and fixes them in place. A fatigue-resistant bolt connection structure is a specially designed fastening system that can maintain stable connection performance under alternating loads for a long time, significantly delaying the initiation and propagation of fatigue cracks, thereby improving the reliability and service life of the overall structure.

[0003] To address this, patent CN218468023U discloses a fatigue-resistant threaded fastener, consisting of a bolt and a nut. The bolt comprises an integrally formed bolt head and a threaded rod, forming a "T" shape. The threaded rod has an external threaded portion, and the nut has an internally threaded hole at the center of its end face, which engages with the external threaded portion. The thread valley of the external threaded portion has an arc-shaped structure, forming a valley bottom. The pitch of the external threaded portion on the bolt is smaller than the pitch of the internal threaded hole on the nut. This fatigue-resistant threaded fastener has a larger thread valley bottom radius, effectively reducing the tensile stress concentration factor at the root of the bolt thread. Furthermore, the pitch of the internal threaded hole on the nut is longer than the pitch of the external threaded portion on the bolt, shifting the most dangerous position on the external threaded portion. Thus, with the same material and dimensions, the fatigue-resistant threaded fastener has a longer fatigue life than ordinary threaded fasteners.

[0004] The fatigue-resistant threaded fasteners mentioned above are not convenient for limiting the nut during use, which can lead to the nut easily loosening and thus affect the tightening force of the bolt. Utility Model Content

[0005] The purpose of this invention is to provide a fatigue-resistant bolt connection structure to solve the defect that existing fatigue-resistant bolt connection structures are not convenient for preventing nuts from loosening.

[0006] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a fatigue-resistant bolt connection structure, including a nut and an anti-loosening structure;

[0007] A connecting block is fixed to the bottom end of the nut, a screw is installed at the bottom end of the connecting block, a nut is installed on the outside of the screw, a washer is fixed to one end of the nut on the outside of the screw, and a buffer structure is provided inside the connecting block;

[0008] The screw has an internal anti-loosening structure, which includes an internal cavity with grooves on both sides. A rotating rod is installed inside the internal cavity, and a moving block is installed on the outside of the rotating rod. Spring grooves are provided on both sides of the moving block, and a telescopic spring is fixed inside the spring groove. A reset plate is fixed to one end of the telescopic spring, and a pin is fixed to one side of the reset plate. The nut has an annular groove inside, and a rotating block is fixed to one end of the rotating rod at the bottom of the screw.

[0009] Preferably, the buffer structure includes a movable cavity disposed inside the connecting block, a connecting plate fixed to the top of the screw inside the movable cavity, guide grooves disposed on both sides of the movable cavity inside the connecting block, guide blocks fixed to both sides of the connecting plate inside the guide grooves, and a buffer spring fixed to the top of the connecting plate.

[0010] Preferably, the guide grooves are symmetrically distributed inside the connecting blocks on both sides of the movable cavity, and the guide grooves and the connecting blocks are slidably connected through the guide grooves.

[0011] With the above structure, the connecting plate can move horizontally inside the movable cavity during use, thereby preventing the screw from rotating inside the connecting block.

[0012] Preferably, a shock-absorbing pad is fixed to the top of the connecting plate, the top of the buffer spring is fixedly connected to the top of the interior of the movable cavity, and the connecting plate and the connecting block form a telescopic structure through the buffer spring.

[0013] With the above structure, when the screw is subjected to external impact, the buffer spring and shock-absorbing pad can absorb the amplitude load, reduce the impact force on the screw, and thus provide fatigue resistance to the bolt.

[0014] Preferably, the sliding grooves are symmetrically distributed on both sides of the built-in cavity, the interior of the built-in cavity is connected to the interior of the sliding grooves, the outer side of the rotating rod is provided with an external thread, the interior of the moving block is provided with an internal thread that matches the outer side of the rotating rod, and the rotating rod and the moving block are threadedly connected.

[0015] With the above structure, it is easier to move the pin into the inside of the nut to limit the nut's position during use.

[0016] Preferably, the spring grooves are symmetrically distributed inside the moving block, and the reset plate and the spring grooves form a telescopic structure through a telescopic spring.

[0017] Preferably, one end of the pin is tapered, and the pin and the nut form an engaging structure through an annular groove.

[0018] With the above structure, during use, the pin can be inserted into the annular groove under the elastic force of the telescopic spring, thereby further fixing the nut, preventing the nut from loosening, and further improving the fatigue resistance of the bolt.

[0019] The fatigue-resistant bolt connection structure provided by this utility model has the following advantages:

[0020] By incorporating a buffer structure and a buffer spring, the bolt is subjected to external impact, causing the buffer spring to undergo elastic deformation. The buffer spring and shock-absorbing pad absorb the amplitude load, reducing the impact force on the bolt and thus providing fatigue resistance.

[0021] By incorporating an anti-loosening structure, the nut is installed on the outside of the screw. When the rotating block pin moves to the inside of the nut, the pin engages with the annular groove under the elastic force of the telescopic spring, thus further securing the nut and preventing it from loosening, thereby improving the bolt's fatigue resistance. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0023] Figure 2 This is a frontal cross-sectional view of the present invention.

[0024] Figure 3 This is a side sectional view of the present invention.

[0025] Figure 4 This is a top view cross-sectional structural diagram of the present invention;

[0026] Figure 5 This is a three-dimensional cross-sectional structural diagram of the nut of this utility model.

[0027] The following are the annotations in the figure: 1. Nut; 2. Connecting block; 3. Screw; 4. Nut; 5. Washer; 6. Buffer structure; 601. Movable cavity; 602. Connecting plate; 603. Guide groove; 604. Guide block; 605. Buffer spring; 7. Anti-loosening structure; 701. Internal cavity; 702. Slide groove; 703. Rotating rod; 704. Moving block; 705. Spring groove; 706. Telescopic spring; 707. Reset plate; 708. Pin; 709. Annular groove; 710. Rotating block. Detailed Implementation

[0028] 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.

[0029] Please see Figure 1-5 The present invention provides a fatigue-resistant bolt connection structure, including a nut 1 and an anti-loosening structure 7.

[0030] Reference Figure 2 and Figure 3 As shown, a connecting block 2 is fixed to the bottom of the nut 1, a screw 3 is installed at the bottom of the connecting block 2, a nut 4 is installed on the outside of the screw 3, a washer 5 is fixed to one end of the nut 4 on the outside of the screw 3, a buffer structure 6 is provided inside the connecting block 2, the buffer structure 6 includes a movable cavity 601 inside the connecting block 2, a connecting plate 602 is fixed to the top of the screw 3 inside the movable cavity 601, guide grooves 603 are provided on both sides of the movable cavity 601 inside the connecting block 2, guide blocks 604 are fixed to both sides of the connecting plate 602 inside the guide grooves 603, a buffer spring 605 is fixed to the top of the connecting plate 602, the guide grooves 603 are symmetrically distributed inside the connecting block 2 on both sides of the movable cavity 601, the guide grooves 603 and the connecting block 2 are slidably connected through the guide grooves 603, a shock-absorbing pad is fixed to the top of the connecting plate 602, the top of the buffer spring 605 is fixedly connected to the top of the movable cavity 601, and the connecting plate 602 and the connecting block 2 are telescopically connected through the buffer spring 605.

[0031] By incorporating a buffer spring 605, when the screw 3 is subjected to an external impact, the connecting plate 602 is driven to cause the guide block 604 to slide inside the guide groove 603, thereby causing the buffer spring 605 to undergo elastic deformation. By fixing a shock-absorbing pad at the top of the connecting plate 602, the buffer spring 605 and the shock-absorbing pad can absorb the amplitude load, reducing the impact force on the screw 3 and thus providing fatigue resistance to the bolt.

[0032] Reference Figures 1-5As shown, the screw 3 has an anti-loosening structure 7 inside. The anti-loosening structure 7 includes an internal cavity 701 inside the screw 3. Slide grooves 702 are provided on both sides of the internal cavity 701. A rotating rod 703 is installed inside the internal cavity 701. A moving block 704 is installed on the outside of the rotating rod 703. Spring grooves 705 are provided on both sides inside the moving block 704. A telescopic spring 706 is fixed inside the spring groove 705. A reset plate 707 is fixed to one end of the telescopic spring 706. A pin 708 is fixed to one side of the reset plate 707. The nut 4 has an annular groove 709 inside. The bottom end of the screw 3 rotates the rod 703... A rotating block 710 is fixed at one end. The sliding groove 702 is symmetrically distributed on both sides of the internal cavity 701. The interior of the internal cavity 701 is connected to the interior of the sliding groove 702. The outer side of the rotating rod 703 is provided with an external thread. The interior of the moving block 704 is provided with an internal thread that matches the outer side of the rotating rod 703. The rotating rod 703 and the moving block 704 are threadedly connected. The spring groove 705 is symmetrically distributed inside the moving block 704. The reset plate 707 and the spring groove 705 form a telescopic structure through the telescopic spring 706. One end of the pin 708 is tapered. The pin 708 and the nut 4 form a locking structure through the annular groove 709.

[0033] By installing the nut 4 on the outside of the screw 3 to connect the object, and then rotating the rotating block 710 to drive the rotating rod 703 to rotate, the moving block 704 moves on the outside of the rotating rod 703, thereby causing the pin 708 to slide inside the slide groove 702. When the pin 708 moves into the inside of the nut 4, it is squeezed, causing the pin 708 to move into the inside of the slide groove 702 and drive the reset plate 707 to compress the telescopic spring 706. When one end of the pin 708 is inserted into the inside of the annular groove 709, the reset plate 707 is reset under the elastic force of the telescopic spring 706. Thus, the pin 708 and the nut 4 are engaged through the annular groove 709, which can further fix the nut 4, prevent the nut 4 from loosening, and further improve the fatigue resistance of the bolt.

[0034] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A fatigue-resistant bolt connection structure, comprising a nut (1) and an anti-loosening structure (7); Its features are: The bottom end of the nut (1) is fixed with a connecting block (2), the bottom end of the connecting block (2) is equipped with a screw (3), the outside of the screw (3) is equipped with a nut (4), one end of the nut (4) on the outside of the screw (3) is fixed with a washer (5), and the inside of the connecting block (2) is provided with a buffer structure (6). The screw (3) is provided with an anti-loosening structure (7). The anti-loosening structure (7) includes an internal cavity (701) provided inside the screw (3). Slide grooves (702) are provided on both sides of the internal cavity (701). A rotating rod (703) is installed inside the internal cavity (701). A moving block (704) is installed on the outside of the rotating rod (703). Spring grooves (705) are provided on both sides inside the moving block (704). A telescopic spring (706) is fixed inside the spring groove (705). A reset plate (707) is fixed at one end of the telescopic spring (706). A pin (708) is fixed on one side of the reset plate (707). An annular groove (709) is provided inside the nut (4). A rotating block (710) is fixed at one end of the rotating rod (703) at the bottom of the screw (3).

2. The fatigue resistant bolted joint structure of claim 1, wherein: The buffer structure (6) includes a movable cavity (601) disposed inside the connecting block (2). A connecting plate (602) is fixed to the top of the screw (3) inside the movable cavity (601). Guide grooves (603) are provided on both sides of the movable cavity (601) inside the connecting block (2). Guide blocks (604) are fixed to both sides of the connecting plate (602) inside the guide grooves (603). A buffer spring (605) is fixed to the top of the connecting plate (602).

3. The fatigue resistant bolted joint structure of claim 2, wherein: The guide groove (603) is symmetrically distributed inside the connecting blocks (2) on both sides of the movable cavity (601), and the guide groove (603) and the connecting block (2) are slidably connected through the guide groove (603).

4. The fatigue resistant bolted joint structure of claim 2, wherein: The top of the connecting plate (602) is fixed with a shock-absorbing pad, and the top of the buffer spring (605) is fixedly connected to the top of the interior of the movable cavity (601). The connecting plate (602) and the connecting block (2) form a telescopic structure through the buffer spring (605).

5. The fatigue resistant bolted joint structure of claim 1, wherein: The groove (702) is symmetrically distributed on both sides of the built-in cavity (701). The interior of the built-in cavity (701) is connected to the interior of the groove (702). The outer side of the rotating rod (703) is provided with an external thread. The interior of the moving block (704) is provided with an internal thread that matches the outer side of the rotating rod (703). The rotating rod (703) and the moving block (704) are threadedly connected.

6. The fatigue resistant bolted joint structure of claim 1, wherein: The spring grooves (705) are symmetrically distributed inside the moving block (704), and the reset plate (707) and the spring grooves (705) form a telescopic structure through the telescopic spring (706).

7. The fatigue resistant bolted joint structure of claim 1, wherein: One end of the pin (708) is tapered, and the pin (708) and the nut (4) are engaged by an annular groove (709).

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