A plastic car hood

Abstract

This utility model provides a plastic car hood, relating to the field of automotive structural design technology. It includes an outer hood panel with an inner hood panel embedded inside. A left mounting bracket is installed on the surface of the inner hood panel near one end, and a right mounting bracket is installed on the surface of the inner hood panel near the other end. In this utility model, the car hood is made of PP+GF30 / 40 composite material, which reduces the weight of the hood, thereby directly increasing the driving range. The hood requires only two sets of molds and one set of fixtures to produce both the inner and outer panels, reducing mold development costs. When multi-cavity molds can be produced simultaneously, production efficiency is improved. Furthermore, by using customized color masterbatches, the painting process for sheet metal outer panels can be eliminated, thus reducing environmental pollution and production costs.

Description

Technical Field

[0001] This utility model relates to the field of automotive structural design technology, and in particular to a plastic automotive hood. Background Technology

[0002] In both traditional and new energy vehicles, the engine hood is a crucial component that plays a decisive role in the overall vehicle weight, NVH (noise, vibration, and harshness).

[0003] Currently, hoods are commonly made using sheet metal stamping, which increases the overall vehicle weight and negatively impacts fuel economy and electric vehicle range. Mold development is costly and involves more processes (stamping, welding, painting), leading to longer production cycles and increased costs. Design freedom is also more limited; complex curved surfaces or structures require multiple sets of molds, increasing development difficulty and freedom. Sheet metal materials (steel) require separate anti-corrosion processes, while aluminum alloys are even more expensive. Utility Model Content

[0004] The purpose of this utility model is to solve the problems of high mold development costs and more processes (stamping, welding, painting) in the existing technology, which lead to long production cycles and increased costs, and to propose a plastic car hood.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a plastic car hood, including an outer hood panel, an inner hood panel embedded inside the outer hood panel, a left mounting bracket installed on the surface of the inner hood panel near one end, and a right mounting bracket installed on the surface of the inner hood panel near the other end.

[0006] Preferably, both ends of the left and right mounting brackets are provided with mounting bracket bolts.

[0007] Preferably, hood lock mounting holes are symmetrically provided on the surface of the inner panel of the hood, near the center of one side.

[0008] Preferably, a cover locking hole is provided on the surface of the inner cover plate and between the cover lock mounting holes.

[0009] Preferably, the inner panel of the hood has three outer panel positioning posts that slide through and are connected to the outer panel of the hood.

[0010] Preferably, irregular holes are symmetrically formed on the surface of the inner panel of the cover.

[0011] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0012] 1. In this utility model, the car hood is made of PP+GF30 / 40 composite material, which can reduce the weight of the car hood and thus directly improve the driving range.

[0013] 2. In this utility model, the production of inner and outer panels of the car hood only requires two sets of molds and one set of fixtures, which can reduce the mold development cost. When multi-cavity molds can be produced simultaneously, production efficiency can be improved. At the same time, by customizing the color masterbatch, the painting process of sheet metal outer panels can be eliminated, thereby reducing environmental pollution and production costs.

[0014] 3. In this utility model, the inner panel of the car hood has a deep cavity, irregular lightweight holes, and a conformal bending design. The cavity structure uses the principle of mechanical dispersion to enhance local strength, adapting to the complex body aesthetics and performance requirements. The integrated pin positioning structure, mounting bracket, locking hole and column reduce the later assembly process and improve production accuracy and efficiency. Attached Figure Description

[0015] Figure 1 A perspective view of a plastic car hood is provided for this utility model;

[0016] Figure 2 A perspective view of a plastic car hood is provided for this utility model.

[0017] Legend: 1. Outer hood panel; 2. Inner hood panel; 3. Left mounting bracket; 4. Right mounting bracket; 5. Mounting bracket bolts; 6. Hood lock mounting holes; 7. Hood locking holes; 8. Outer panel positioning posts. Detailed Implementation

[0018] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0019] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0020] Example 1, as Figure 1-2 As shown, this utility model provides a plastic car hood, including an outer hood panel 1, an inner hood panel 2 embedded inside the outer hood panel 1, a left mounting bracket 3 installed on the surface of the inner hood panel 2 near one end, and a right mounting bracket 4 installed on the surface of the inner hood panel 2 near the other end.

[0021] The effect achieved by the entire embodiment 1 is that by embedding the inner hood panel 2 inside the outer hood panel 1, the inner hood panel 2 can be installed inside the outer hood panel 1. The left mounting bracket 3 is installed on the surface of the inner hood panel 2 near one end, and the right mounting bracket 4 is installed on the surface of the inner hood panel 2 near the other end, which can achieve the effect of connecting with the vehicle body and positioning the hood assembly.

[0022] Example 2, as Figure 1-2 As shown, mounting bracket bolts 5 pass through both ends of the left mounting bracket 3 and the right mounting bracket 4; hood lock mounting holes 6 are symmetrically opened on the surface of the inner hood plate 2 near the center of one side; hood lock positioning holes 7 are opened on the surface of the inner hood plate 2 between the hood lock mounting holes 6; three outer plate positioning posts 8 pass through and slide on the surface of the inner hood plate 2, and the bottom of the outer plate positioning posts 8 is fixedly connected to the outer hood plate 1; irregular holes are symmetrically opened on the surface of the inner hood plate 2.

[0023] The overall effect of Embodiment 2 is as follows: Mounting bracket bolts 5 penetrate both ends of the left mounting bracket 3 and the right mounting bracket 4, serving to fix the mounting brackets to the vehicle body; hood lock mounting holes 6 are symmetrically opened on the surface of the inner hood panel 2 near one side center, serving to install the hood lock; hood lock positioning holes 7 are opened on the surface of the inner hood panel 2 between the hood lock mounting holes 6, serving to position the hood lock; three outer panel positioning posts 8 penetrate and slide on the surface of the inner hood panel 2, with the bottom of the outer panel positioning posts 8 fixedly connected to the outer hood panel 1, serving to position the outer hood panel 1 and the inner hood panel 2; and irregular holes symmetrically opened on the surface of the inner hood panel 2 reduce weight.

[0024] Working principle: PP, glass fiber, and color masterbatch are mixed to form injection molding granules. These granules are melted at a low temperature of 200-280℃ and injected into the cavity under high pressure through a multi-cavity mold. After cooling and solidification, the mold is opened, simultaneously forming the outer hood panel 1 and the inner hood panel 2. The four main and auxiliary positioning structures on the back of the outer panel precisely match the pins and positioning holes of the inner panel to achieve initial alignment. A high-strength adhesive is applied to an 8-20mm wide adhesive area on the edge of the inner panel to prepare for the final connection. After the adhesive cures, it forms a structural seal, ensuring the overall rigidity and waterproof performance of the hood. The left mounting bracket 3 and the right mounting bracket 4 are fixed to the vehicle body with bolts to achieve mechanical connection and load transfer. The 20-30mm deep cavity utilizes the principle of "moment of inertia" to improve bending strength. The conformal bending shape ensures that stress is evenly distributed along the curved surface, avoiding stress concentration. Irregular holes reduce weight while the strength loss is compensated by reinforcing ribs around the holes, ensuring that the hood meets the requirements of opening, closing, collision, and other operating conditions.

[0025] The wiring diagrams for the outer cover plate 1, inner cover plate 2, and mounting bracket bolts 5 in this utility model are common knowledge in the field. Their working principle is a well-known technology. The appropriate model is selected according to actual use. Therefore, the control method and wiring layout of the outer cover plate 1, inner cover plate 2, and mounting bracket bolts 5 will not be explained in detail.

[0026] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A plastic automobile front hood comprising a hood outer panel (1), characterized in that: The outer cover plate (1) is embedded with the inner cover plate (2). A left mounting bracket (3) is installed on the surface of the inner cover plate (2) near one end, and a right mounting bracket (4) is installed on the surface of the inner cover plate (2) near the other end.

2. A plastic vehicle front hood according to claim 1, characterized in that: Mounting bracket bolts (5) are inserted through both ends of the left mounting bracket (3) and the right mounting bracket (4).

3. A plastic car hood according to claim 1, characterized in that: The inner panel (2) of the hood has symmetrically arranged hood lock mounting holes (6) on its surface and near the center of one side.

4. A plastic car hood according to claim 3, characterized in that: A cover locking hole (7) is provided on the surface of the inner panel (2) of the cover and between the cover lock mounting holes (6).

5. A plastic car hood according to claim 1, characterized in that: Three outer plate positioning posts (8) are slidably slid through the surface of the inner plate of the hood (2), and the bottom of the outer plate positioning posts (8) is fixedly connected to the outer plate of the hood (1).

6. A plastic car hood according to claim 1, characterized in that: The inner panel (2) of the machine cover has irregular holes symmetrically opened on its surface.

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