A locking device for preventing loosening of a fastener of a vehicle

Abstract

This utility model discloses an anti-loosening locking device for automotive fasteners, relating to the field of automotive fastener technology. It includes an automotive sheet metal panel. A fastening screw is threaded to the top of the panel, and a fastening nut is threaded onto the screw. A limiting shaft is fixedly connected to the top of the nut. A limiting hole is formed on the outer surface of the limiting shaft, and a locking rod is inserted into the limiting hole. A connecting shaft is fixedly connected to the bottom of the locking rod, and a sleeve is connected to the bottom of the connecting shaft. A groove is formed on the automotive sheet metal panel on one side of the fastening nut, and a slider is slidably connected within the groove. A limiting spring is fixedly connected between the slider and the inner wall of the groove near the fastening nut. This utility model utilizes the elastic force of the limiting spring to push the slider when the locking rod is inserted into the limiting hole, causing the locking rod to press against the limiting hole, thus preventing the limiting shaft and the fastening nut from rotating.

Description

Technical Field

[0001] This utility model relates to the field of automotive fastener technology, specifically to an automotive fastener anti-loosening locking device. Background Technology

[0002] Fasteners are a wide range of mechanical parts used for fastening connections, covering multiple fields such as automobiles, machinery, and electronics. Bolts, as a common type of fastener, are used in conjunction with nuts to secure parts and are often referred to as the "rice of industry," indispensable in critical components such as automobile bodies, chassis, and power systems.

[0003] However, most existing automotive bolt structures are traditional threaded connections, which are prone to loosening due to slippage of the threaded pair between the bolt and nut under conditions of vehicle vibration and bumps. Current mainstream anti-loosening methods, such as spring washers and thread-locking adhesives, rely on a single principle: spring washers are prone to failure due to elastic fatigue, while thread-locking adhesives have defects such as high-temperature failure and damage to the connection during disassembly. Moreover, both are difficult to adapt to different bolt sizes and complex environments, resulting in limited anti-loosening effects and narrow applicability.

[0004] To address this issue, we designed an anti-loosening locking device for automotive fasteners. Utility Model Content

[0005] The purpose of this utility model is to provide an anti-loosening locking device for automotive fasteners to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, this utility model provides an anti-loosening locking device for automotive fasteners, including an automotive sheet metal. A fastening screw is threadedly connected to the top of the automotive sheet metal, and a fastening nut is threadedly connected to the fastening screw. A limiting shaft is fixedly connected to the top of the fastening nut. The fastening screw is threadedly connected to the center position of the fastening nut and the limiting shaft. A limiting hole is opened on the outer surface of the limiting shaft, and a locking rod is inserted into the limiting hole.

[0007] Furthermore, the locking rod is L-shaped, and a connecting shaft is fixedly connected to the bottom end of the locking rod, and a sleeve is connected to the bottom end of the connecting shaft.

[0008] Furthermore, a groove is provided on the automotive sheet metal at the position of the fastening nut, and a slider is slidably connected in the groove, with the top end of the slider being fixedly connected to the bottom end of the sleeve.

[0009] Furthermore, a limit spring is fixedly connected between the slider and the inner wall of the groove near the fastening nut.

[0010] Furthermore, there are multiple limiting holes, which are evenly distributed on the sidewall of the limiting shaft.

[0011] Furthermore, a movable plate is slidably connected inside the sleeve, and the top end of the movable plate is fixedly connected to the bottom end of the connecting shaft.

[0012] Furthermore, a compression spring is fixedly connected between the bottom end of the movable plate and the inner bottom wall of the sleeve.

[0013] Furthermore, the inner bottom wall of the chute is provided with positioning holes, and the number of positioning holes is multiple.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. In this utility model, an L-shaped locking rod is inserted into the limiting hole of the limiting shaft to form a rigid mechanical jamming, directly preventing the rotation of the fastening nut; combined with the continuous elastic clamping of the limiting spring, it compensates for the gap caused by vibration, achieving dual anti-loosening through jamming and elastic clamping. The elastic deformation of the limiting spring can absorb vibration energy, preventing wear or loosening caused by rigid collision between the locking rod and the limiting hole, thus improving durability.

[0016] 2. In this utility model, the compression spring inside the sleeve cooperates with the moving plate, allowing the locking rod to slide up and down as the height of the limiting hole changes, thus adapting to various specifications of screws without replacing parts. Multiple evenly distributed limiting holes can accommodate locking requirements after the limiting shaft rotates at any angle, avoiding the installation problem caused by thread preload angle deviations in traditional anti-loosening devices. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the exterior of this utility model;

[0018] Figure 2 This is a schematic diagram of the external front structure of this utility model;

[0019] Figure 3 This is a cross-sectional view of the front of the present invention;

[0020] Figure 4 This is a cross-sectional structural diagram of the sleeve of this utility model.

[0021] In the diagram: 1. Automotive sheet metal; 2. Fastening screw; 3. Fastening nut; 4. Limiting shaft; 5. Limiting hole; 6. Locking rod; 7. Connecting shaft; 8. Sleeve; 9. Slide groove; 10. Slider; 11. Limiting spring; 12. Moving plate; 13. Compression spring; 14. Positioning hole. Detailed Implementation

[0022] 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.

[0023] Please see Figure 1 and Figure 3 This utility model provides a technical solution: an anti-loosening locking device for automotive fasteners, including an automotive sheet 1, a fastening screw 2 threadedly connected to the top of the automotive sheet 1, a fastening nut 3 threadedly connected to the fastening screw 2, a limiting shaft 4 fixedly connected to the top of the fastening nut 3, the fastening screw 2 threadedly connected at the center position of the fastening nut 3 and the limiting shaft 4, a limiting hole 5 opened on the outer surface of the limiting shaft 4, a locking rod 6 inserted into the limiting hole 5, the locking rod 6 being L-shaped, a connecting shaft 7 fixedly connected to the bottom end of the locking rod 6, a sleeve 8 connected to the bottom end of the connecting shaft 7, a sliding groove 9 opened on the automotive sheet 1 at one side of the fastening nut 3, a slider 10 slidably connected in the sliding groove 9, the top end of the slider 10 being fixedly connected to the bottom end of the sleeve 8, and a limiting spring 11 fixedly connected between the slider 10 and the inner wall of the sliding groove 9 near the fastening nut 3.

[0024] In practice, one end of the limiting spring 11 in the slide groove 9 is connected to the slider 10, and the other end is fixed to the inner wall of the slide groove 9. When the locking rod 6 is inserted into the limiting hole 5, the limiting spring 11 is in its natural state. Through elastic force, it pushes the slider 10, causing the locking rod 6 to press against the limiting hole 5, forming a horizontal mechanical lock and preventing the limiting shaft 4 and the fastening nut 3 from rotating. When the car vibrates, the fastening nut 3 may attempt to rotate due to the vibration torque. At this time, the locking rod 6 jams the limiting shaft 4 through the limiting hole 5, directly hindering its rotation. The elastic deformation of the limiting spring 11 can absorb the vibration energy, and the continuous horizontal pressing force compensates for the gap caused by the vibration, preventing the locking rod 6 from loosening from the limiting hole 5.

[0025] See Figure 2 There are multiple limiting holes 5, which are evenly distributed on the side wall of the limiting shaft 4.

[0026] In practice, multiple limiting holes 5 are evenly distributed on the outer surface of the limiting shaft 4. During installation, the corresponding limiting hole 5 is selected according to the rotation angle of the limiting shaft 4, and the L-shaped locking rod 6 is inserted into the limiting hole 5.

[0027] See Figure 4 A movable plate 12 is slidably connected inside the sleeve 8. The top end of the movable plate 12 is fixedly connected to the bottom end of the connecting shaft 7. A compression spring 13 is fixedly connected between the bottom end of the movable plate 12 and the inner bottom wall of the sleeve 8.

[0028] In practice, the bottom end of the connecting shaft 7 extends into the sleeve 8 and is fixedly connected to the moving plate 12. The compression spring 13 below the moving plate 12 provides elastic support. When the height of the limiting hole 5 changes, the locking rod 6 drives the connecting shaft 7 to move up and down. The moving plate 12 slides in the sleeve 8 and compresses or stretches the compression spring 13, so that the top end of the locking rod 6 can always be inserted into the limiting hole 5, achieving vertical height self-adaptation, which can adapt to different working conditions without replacing parts.

[0029] See Figure 3 The inner bottom wall of the slide 9 is provided with positioning holes 14. There are multiple positioning holes 14. After the locking rod 6 is inserted into the limiting hole 5, the positioning rod can be inserted into the appropriate positioning hole 14.

[0030] In practice, when the locking rod 6 is inserted into the limiting hole 5, the limiting spring 11 maintains the locking rod 6 in a pressed state through its elastic force. At this time, the positioning rod is inserted into the positioning hole 14 at the bottom of the slide groove 9, which can directly fix the slider 10 in the slide groove 9, forming a double insurance of spring pressing and positioning rod rigid locking.

[0031] Working principle:

[0032] After the fastening screw 2 passes through the automotive sheet 1, it connects to the fastening nut 3 via threads, achieving initial fastening of the fastener. At this time, the limiting shaft 4 at the top of the fastening nut 3 tightens synchronously with the nut, pressing tightly against the surface of the automotive sheet 1, and the L-shaped locking rod 6 is inserted into the limiting hole 5. The bottom end of the locking rod 6 is connected to the sleeve 8 via the connecting shaft 7, and the slider 10 fixed at the bottom of the sleeve 8 is located in the groove 9 of the automotive sheet 1.

[0033] One end of the limiting spring 11 in the slide groove 9 is connected to the slider 10, and the other end is fixed to the inner wall of the slide groove 9. When the locking rod 6 is inserted into the limiting hole 5, the limiting spring 11 is in its natural state. It pushes the slider 10 through elastic force, causing the locking rod 6 to press against the limiting hole 5, forming a horizontal mechanical lock and preventing the limiting shaft 4 and the fastening nut 3 from rotating.

[0034] When the car vibrates while driving, the fastening nut 3 may attempt to rotate due to the vibration torque. At this time, the locking rod 6 locks the limiting shaft 4 through the limiting hole 5, directly preventing its rotation. The elastic deformation of the limiting spring 11 can absorb the vibration energy and compensate for the gap caused by the vibration through a continuous horizontal clamping force, thus preventing the locking rod 6 from loosening from the limiting hole 5.

[0035] During disassembly, manually pull the locking rod 6 away from the limiting shaft 4 to overcome the elastic force of the limiting spring 11 and pull the locking rod 6 out of the limiting hole 5, thus releasing the rotation restriction on the limiting shaft 4. If the locking rod 6 is stuck due to long-term vibration, the elastic potential energy of the compression spring 13 can help push out the connecting shaft 7, making it easy to quickly pull out the locking rod 6. After unlocking, the fastening nut 3 can be rotated normally using a wrench or other tools to remove it from the fastening screw 2, completing the disassembly.

[0036] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A locking device for preventing loosening of automotive fasteners, comprising automotive sheet metal (1), characterized in that, The top end of the automotive sheet (1) is threaded with a fastening screw (2), and a fastening nut (3) is threaded on the fastening screw (2). The top end of the fastening nut (3) is fixedly connected to a limiting shaft (4). The fastening screw (2) is threaded at the center position of the fastening nut (3) and the limiting shaft (4). A limiting hole (5) is opened on the outer surface of the limiting shaft (4), and a locking rod (6) is inserted into the limiting hole (5).

2. The automotive fastener anti-loosening locking device as described in claim 1, characterized in that: The locking rod (6) is L-shaped, and a connecting shaft (7) is fixedly connected to the bottom end of the locking rod (6). A sleeve (8) is connected to the bottom end of the connecting shaft (7).

3. The automotive fastener anti-loosening locking device as described in claim 2, characterized in that: A groove (9) is provided on the automotive sheet (1) at the position on the side of the fastening nut (3). A slider (10) is slidably connected in the groove (9). The top end of the slider (10) is fixedly connected to the bottom end of the sleeve (8).

4. The automotive fastener anti-loosening locking device as described in claim 3, characterized in that: A limit spring (11) is fixedly connected between the slider (10) and the inner wall of the groove (9) near the fastening nut (3).

5. The automotive fastener anti-loosening locking device as described in claim 4, characterized in that: The number of the limiting holes (5) is multiple, and the multiple limiting holes (5) are evenly distributed on the side wall of the limiting shaft (4).

6. The automotive fastener anti-loosening locking device as described in claim 5, characterized in that: A movable plate (12) is slidably connected inside the sleeve (8), and the top end of the movable plate (12) is fixedly connected to the bottom end of the connecting shaft (7).

7. The automotive fastener anti-loosening locking device as described in claim 6, characterized in that: A compression spring (13) is fixedly connected between the bottom end of the movable plate (12) and the inner bottom wall of the sleeve (8).

8. The automotive fastener anti-loosening locking device as described in claim 7, characterized in that: The inner bottom wall of the chute (9) is provided with positioning holes (14), and there are multiple positioning holes (14).

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