Composite panel structure and thin wall door

Abstract

This utility model provides a composite protective panel structure and a thin-walled car door, relating to the field of automotive door technology. The composite protective panel structure includes a protective panel base layer, a reinforcing frame, a buffer layer, and an interior trim layer arranged sequentially from the outer to the inner side of the car door. The reinforcing frame is located inside the protective panel base layer and is grid-shaped. The buffer layer includes a sealed cavity formed by an upper buffer plate and a lower buffer plate, and the sealed cavity is filled with sound-insulating cotton. The interior trim layer is located inside the buffer layer and is a fiber leather layer. The thin-walled car door includes an inner door panel and an outer door panel. The composite protective panel structure is installed on the inner side of the inner door panel, and the composite protective panel structure is fixedly connected to the inner door panel through its mounting flange. This utility model, through the integrated design of the grid reinforcing frame and the sealed sound-insulating cavity, achieves lightweighting while improving the structural rigidity, sound insulation, noise reduction, and cushioning safety performance of the car door components.

Description

Technical Field

[0001] This utility model relates to the field of automotive door technology, and in particular to a composite protective plate structure and a thin-walled car door. Background Technology

[0002] As an important part of the vehicle's interior, the car door panel not only directly affects the overall visual aesthetics, ride comfort, and driving experience, but also serves as a carrier for the integration of door functions and a component of passive safety protection.

[0003] With the trend towards lightweighting and environmental protection in the automotive industry, traditional car door panels often use a single material or a simple multi-layer composite material structure. These structures typically consist of a rigid plastic base, an attached foam cushioning layer, and an outermost fabric or leather finish. While this structure meets basic decorative and sound insulation requirements to some extent, its overall performance has significant shortcomings.

[0004] To achieve the necessary structural rigidity, a single plastic matrix often requires increased wall thickness, which contradicts the lightweight design philosophy. Simple foam buffer layers offer limited effectiveness in sound insulation and noise reduction, especially in suppressing low-to-mid-frequency noise, and their energy absorption capacity is difficult to precisely control and optimize in side-impact accidents. Furthermore, the functional layers are typically connected using adhesives or mechanical clips, leading to issues such as weak connections, rattles, and cumbersome manufacturing processes, making it difficult to meet the modern automotive industry's requirements for component integration, high performance, and high reliability.

[0005] Therefore, in response to the above problems, the applicant needs to design a composite protective plate structure and a thin-walled car door to solve the problem. Utility Model Content

[0006] On one hand, this application provides a composite protective panel structure, including a protective panel base layer, a reinforcing frame, a buffer layer, and an interior trim layer arranged sequentially from the outer side to the inner side of the vehicle door. The protective panel base layer is made of a high molecular polymer. The reinforcing frame is disposed on the inner side of the protective panel base layer and is in the shape of a grid. The buffer layer includes a sealed cavity formed by an upper buffer plate and a lower buffer plate, and the sealed cavity is filled with sound insulation cotton. The interior trim layer is disposed on the inner side of the buffer layer and is a fiber leather layer.

[0007] Preferably, the reinforcing frame and the protective plate base layer are integrally formed by in-mold molding. This integral forming enhances the connection strength between the protective plate base layer and the reinforcing frame, avoiding noise and loosening issues.

[0008] Preferably, the edge of the base layer of the protective plate extends outward to form an installation flange for connection with the vehicle door. The installation flange facilitates a quick and reliable connection between the composite protective plate structure and the vehicle door, improving assembly efficiency.

[0009] Preferably, both the upper and lower buffer plates are thermoplastic elastomer sheets. Using thermoplastic elastomer sheets as buffer plates provides excellent flexibility and sealing, thus enhancing the buffering effect.

[0010] Preferably, the sound insulation cotton is polyurethane foam cotton. The sealed cavity filled with polyurethane foam cotton effectively absorbs low- and mid-frequency noise, thereby improving the sound insulation and noise reduction performance.

[0011] Preferably, the polymer of the base layer of the protective panel is a polypropylene composite material with added flame retardants. The base layer of the protective panel made of polypropylene composite material with added flame retardants improves fire safety and meets environmental protection requirements.

[0012] Preferably, in another aspect, this application also provides a thin-walled vehicle door, including an inner door panel and an outer door panel, wherein a composite protective panel structure is installed on the inner side of the inner door panel, and the composite protective panel structure is fixedly connected to the inner door panel through its mounting flange.

[0013] Preferably, the inner panel of the door is provided with a frame opening for installing a window. The frame opening on the inner panel of the door facilitates window installation and optimizes the overall structure and space utilization of the door.

[0014] This utility model provides a composite protective plate structure and a thin-walled car door, which, compared with the prior art: 1. This utility model combines an in-mold-formed grid reinforcement frame with a protective plate substrate, and fills a sealed cavity enclosed by elastic sheets with sound insulation cotton, achieving a balance between lightweight structure and high rigidity, while improving the overall performance of car door sound insulation, noise reduction and buffering energy absorption.

[0015] 2. By using flame-retardant polymer material for the protective plate base layer and the installation flange at the edge of the protective plate base layer, as well as the integrated application with the thin-walled car door inner panel, this utility model not only simplifies the assembly process and improves the connection reliability, but also enhances the fire safety and structural integrity of the whole vehicle. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the layered structure of the composite protective plate according to an embodiment of the present utility model; Figure 2This is a schematic diagram of the layered structure of the buffer layer in an embodiment of the present invention; Figure 3 This is a schematic diagram of the three-dimensional structure of the reinforced skeleton according to an embodiment of the present utility model; Figure 4 This is a layered block diagram of the composite protective plate structure according to an embodiment of the present utility model; Figure 5 This is a three-dimensional structural diagram of the inner panel of the car door according to an embodiment of the present utility model.

[0018] icon: 1. Base layer of protective panel; 2. Reinforced frame; 3. Buffer layer; 4. Interior trim layer; 5. Installation flange; 6. Upper buffer plate; 7. Sound insulation cotton; 8. Lower buffer plate; 9. Door inner panel; 10. Frame opening. Detailed Implementation

[0019] The following detailed description, in conjunction with the accompanying drawings, outlines some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0020] Please refer to Figures 1-4 This utility model embodiment provides a composite protective panel structure, including a protective panel base layer 1, a reinforcing frame 2, a buffer layer 3, and an interior trim layer 4 arranged sequentially from the outside to the inside of the car door. The protective panel base layer 1 is made of a high molecular polymer. The reinforcing frame 2 is located inside the protective panel base layer 1 and is in the shape of a grid. The buffer layer 3 includes a sealed cavity formed by an upper buffer plate 6 and a lower buffer plate 8, and the sealed cavity is filled with sound insulation cotton 7. The interior trim layer 4 is located inside the buffer layer 3 and is a fiber leather layer.

[0021] To enhance the connection strength between the base plate 1 and the reinforcing frame 2, the reinforcing frame 2 and the base plate 1 are integrally combined through in-mold molding.

[0022] To facilitate a quick and reliable connection between the composite guard plate structure and the inner door panel 9, the edge of the guard plate base layer 1 extends outward to form an installation flange 5 for connection with the door, thus improving assembly efficiency.

[0023] Both the upper buffer plate 6 and the lower buffer plate 8 are thermoplastic elastomer sheets. Using thermoplastic elastomer sheets as buffer plates provides excellent flexibility and sealing, enhancing the buffering effect. The sound insulation cotton 7 is polyurethane foam, which can effectively absorb mid-to-low frequency noise, thereby improving sound insulation and noise reduction performance. The polymer of the protective plate base layer 1 is a polypropylene composite material with added flame retardants. The protective plate base layer 1 made of polypropylene composite material with added flame retardants improves fire safety and meets environmental protection requirements.

[0024] Please refer to Figure 5On the other hand, this application also provides a thin-walled car door, including an inner door panel 9 and an outer door panel. A composite protective panel structure is installed on the inner side of the inner door panel 9. The composite protective panel structure is fixedly connected to the inner door panel 9 through its mounting flange 5. A frame hole 10 is provided on the inner door panel 9, and the frame hole 10 is used to install a car window. The thin-walled car door adopts a composite protective panel structure, which realizes lightweight design while maintaining high structural strength and functional integration.

[0025] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A composite protective plate structure, characterized in that: The vehicle includes a protective panel base layer (1), a reinforcing frame (2), a buffer layer (3), and an interior trim layer (4) arranged sequentially from the outside to the inside of the door. The protective panel base layer (1) is made of a high-molecular polymer. The reinforcing frame (2) is located inside the protective panel base layer (1) and is in the shape of a grid. The buffer layer (3) includes a sealed cavity formed by an upper buffer plate (6) and a lower buffer plate (8), and the sealed cavity is filled with sound insulation cotton (7). The interior trim layer (4) is located inside the buffer layer (3) and is a fiber leather layer.

2. The composite protective plate structure according to claim 1, characterized in that: The reinforcing frame (2) and the protective plate base layer (1) are integrally combined by in-mold molding.

3. The composite protective plate structure according to claim 1, characterized in that: The edge of the protective plate base layer (1) extends outward to form an installation flange (5) for connection with the vehicle door.

4. The composite protective plate structure according to claim 1, characterized in that: Both the upper buffer plate (6) and the lower buffer plate (8) are thermoplastic elastomer sheets.

5. The composite protective plate structure according to claim 1, characterized in that: The sound insulation cotton (7) is polyurethane foam cotton.

6. The composite protective plate structure according to claim 1, characterized in that: The polymer of the base layer (1) of the protective plate is a polypropylene composite material with added flame retardant.

7. A thin-walled car door, characterized in that: Includes an inner door panel (9) and an outer door panel. The inner side of the inner door panel (9) is equipped with a composite guard plate structure as described in any one of claims 1-6. The composite guard plate structure is fixedly connected to the inner door panel (9) through its mounting flange (5).

8. The thin-walled car door according to claim 7, characterized in that: The inner panel (9) of the door is provided with a frame hole (10), and the frame hole (10) is used to install the window.

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