Structure of locking screw

Abstract

This utility model discloses a screw-locking structure, including a lamp housing, a first side rib, and a second side rib. Both the first and second side ribs are vertically connected to the lamp housing and are arranged parallel to each other to form a concave groove for accommodating the screw. The lamp housing has a boss at the bottom corresponding to the side ribs to prevent damage to the lamp housing surface during screw tightening. Reinforcing ribs are provided at the contact surfaces of the first and second side ribs with the lamp housing to enhance the structural strength of the ribs themselves. This utility model can significantly save space: by forming a concave groove through two parallel side ribs, the elastic deformation of the ribs generates radial compressive force when the screw is screwed in, achieving circumferential screw locking. Compared to the traditional doghouse structure, the space occupied is reduced by 40%–60%, and it can be adapted to space-constrained areas such as inclined lamp housing surfaces.

Description

Technical Field

[0001] This utility model belongs to the technical field of automotive lighting assembly, specifically relating to the structure of locking screws. Background Technology

[0002] In the production and assembly of automotive lighting components, a fixing structure is often required to tighten screws and complete component assembly. The doghouse structure (commonly known as a "dog kennel" structure) is one of the commonly used fixing structures in interior and exterior plastic parts. It is named for its resemblance to a dog kennel, and common forms include snap-fit ​​bases, snap-fit ​​bases, support bases, and pillar bases. It is mainly used in three scenarios: first, as a snap-fit ​​mounting structure; second, when an unavoidably thick structure is directly connected to the base surface, a doghouse structure is used to prevent shrinkage marks; and third, when the mounting or support structure is too long and lacks strength, a doghouse structure is used as a base to enhance strength.

[0003] For example, CN222891942U discloses a novel automotive taillight trim panel mounting structure, including a trim panel with a mounting base fixedly connected to its rear end. The mounting base is a doghouse structure.

[0004] However, existing doghouse structures have significant space limitations, requiring at least 3mm of countersunk hole space for screws. In space-constrained areas such as the inclined lens surface of automotive lights (typically with an inclination angle of 30°–60°), this space requirement cannot be met, making traditional doghouse structures unsuitable. A more space-saving screw fixing solution is urgently needed. Utility Model Content

[0005] The technical problem solved by this invention is that the doghouse structure in the prior art cannot be used in space-constrained areas such as tilted lamp housings. This invention provides a screw-locking structure to achieve stable screw locking in small spaces.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a screw-locking structure, including a lamp housing, a first side rib, and a second side rib; the first side rib and the second side rib are both vertically connected to the lamp housing, and are arranged in parallel to form a concave groove for accommodating the screw; the lamp housing is provided with a boss at the bottom corresponding to the side rib, which can prevent damage to the lamp housing surface during screw tightening; reinforcing ribs are provided at the contact surfaces of the first side rib and the second side rib with the lamp housing to improve the structural strength of the ribs themselves.

[0007] Furthermore, the wall thickness of the first side rib and the second side rib is 0.4 to 0.6 times the wall thickness of the lamp housing, so as to ensure the structural strength of the first side rib and the second side rib.

[0008] Furthermore, the upper surfaces of the first and second side ribs are inclined, so that even if the screws and nuts are not parallel to the upper surfaces, they can still be effectively locked and fixed.

[0009] Furthermore, the side ribs are made of the same material as the lamp housing body (e.g., PA66-GF30), and the side ribs are locally toughened (e.g., by adding TPE elastomer), which can enhance the fatigue resistance of the ribs and prevent cracking when tightening screws.

[0010] Furthermore, the ratio of the height of the first side rib and the second side rib to the screw insertion depth is 1:1.5–1:2 (for example, when the screw is inserted 3mm, the rib height is 1.5–2mm). This ratio setting can ensure the linear transmission of the compressive force and guarantee the locking effect.

[0011] Furthermore, the lamp housing is tilted at an angle of 30°–60° to suit typical space-constrained scenarios in automotive lighting.

[0012] Furthermore, the height of the side ribs is 1–3 mm, which, combined with the wall thickness design, achieves a balance between space optimization and strength assurance.

[0013] Compared with the prior art, the present invention provides a screw-locking structure, which has the following advantages: 1. This utility model can significantly save space: by forming a concave groove through two parallel side ribs, the ribs elastically deform when the screw is screwed in, generating radial extrusion force to achieve circumferential locking of the screw. Compared with the traditional doghouse structure, the space occupied is reduced by 40%–60%, and it can be adapted to space-constrained areas such as tilted lamp housings. 2. This utility model can improve locking stability: the side ribs adopt a symmetrical parallel design, which increases the contact area with the screw threads and the pull-out force can reach more than 200N; at the same time, by optimizing the ratio of screw insertion depth to rib height, the extrusion force is linearly transmitted, further ensuring the locking effect. 3. This utility model optimizes structural reliability: the side rib wall thickness is designed to be 0.4 to 0.6 times the lamp housing wall thickness, which can effectively avoid the formation of "hot spots" and reduce defects such as shrinkage marks and voids during injection molding; combined with local toughening treatment and reinforcing rib design, the fatigue resistance and structural strength of the ribs are significantly improved, and cracking is avoided when locking screws. Attached Figure Description

[0014] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall structure of the locking screw proposed in this utility model; Figure 2 This is a partial schematic diagram of the structure of the locking screw proposed in this utility model; In the diagram: 1. Lamp housing; 2. First side rib; 3. Second side rib; 4. Boss; 5. Reinforcing rib; 6. Screw. Detailed Implementation

[0015] 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.

[0016] Please see Figure 1 and Figure 2 This utility model provides a screw locking structure for use in an automotive lamp housing 1 with a 45° tilt angle and a wall thickness of 1.7mm. The structure includes a first side rib 2, a second side rib 3, and a boss 4. The first side rib 2 and the second side rib 3 are both vertically connected to the lamp housing 1, and are arranged parallel to each other to form a concave groove. The side rib wall thickness is 0.85mm (0.5 times the lamp housing wall thickness), and the height is 2mm.

[0017] The boss 4 is located at the bottom of the corresponding side rib of the lamp housing 1 to prevent damage to the lamp housing 1 when the screw 6 is tightened. The first side rib 2 and the second side rib 3 are both made of PA66-GF30, consistent with the body of the lamp housing 1, and the ribs are locally toughened by adding TPE elastomer. During assembly, a suitable screw 6 is selected, with a screw-in depth of 3mm (ratio of the side rib height to 1:1.5). When the screw 6 is screwed into the concave groove, the first side rib 2 and the second side rib 3 on both sides undergo elastic deformation and generate radial extrusion force, achieving circumferential locking of the screw 6; due to the large contact area between the side rib and the screw 6 thread and the linear transmission of extrusion force, the pull-out force can reach 220N, and the locking stability is excellent. At the same time, the optimized design of the side rib wall thickness avoids the formation of "hot spots" during injection molding, and there are no defects such as shrinkage marks or voids; the toughening treatment improves the fatigue resistance of the ribs, and no cracking occurs after multiple tightening operations.

[0018] In another embodiment of this utility model, the upper surfaces of the first side rib 2 and the second side rib 3 are inclined, and the screws and nuts are not parallel to the upper surfaces; the rest of the structure is the same as in the above embodiment. Assembly tests show that this structure can still achieve stable locking and fixing, further expanding the applicable scenarios of the structure. In addition, reinforcing ribs 5 are added at the contact surfaces of the first side rib 2 and the second side rib 3 with the lamp housing 1, which can further improve the structural strength of the connection between the ribs and the lamp housing, and maintain good locking performance even under vibration.

[0019] 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 structure for a locking screw, characterized in that, Includes lamp housing (1), first side rib (2) and second side rib (3); The first side rib (2) and the second side rib (3) are both vertically connected to the lamp housing (1), and the two are arranged in parallel to form a concave groove for accommodating the screw (6); The lamp housing (1) has a boss (4) at the bottom corresponding to the first side rib (2) and the second side rib (3) for limiting the screw (6). The first side rib (2) and the second side rib (3) are provided with reinforcing ribs (5) at the contact surfaces with the lamp housing (1).

2. The structure of the locking screw according to claim 1, characterized in that: The first side rib (2) and the second side rib (3) have the same wall thickness and are 0.4 to 0.6 times the wall thickness of the lamp housing (1).

3. The structure of the locking screw according to claim 1, characterized in that: The upper surfaces of the first side rib (2) and the second side rib (3) are inclined.

4. The structure of the locking screw according to claim 1, characterized in that: The material of the first side rib (2) and the second side rib (3) is the same as that of the lamp housing body, and the first side rib (2) and the second side rib (3) are toughened.

5. The structure of the locking screw according to claim 1, characterized in that: The ratio of the height of the first side rib (2) and the second side rib (3) to the screw insertion depth of the screw (6) is 1:1.5–1:

2.

6. The structure of the locking screw according to claim 1, characterized in that: The lamp housing (1) is tilted with an angle of 30°–60°.

7. The structure of the locking screw according to claim 1, characterized in that: The height of the first side rib (2) and the second side rib (3) is 1–3 mm.

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