Composite structure tail door and automobile

Abstract

The utility model relates to a composite structure tail door and an automobile, the tail door is assembled on the automobile, the composite structure tail door comprises a tail door outer plate and a tail door insert injection molding inner plate, the tail door insert injection molding inner plate comprises a tail door inner plate, the tail door inner plate comprises a first plate and a second plate which are connected in a bending mode, and the first plate is connected with the second plate in a bending mode. The first plate and the second plate are groove plates, the first plate is an inverted-U-shaped groove and is connected with the top side of the second plate to form a hole, a plurality of linear force transmission beams are arranged in the groove in the top side of the first plate and the groove in the second plate respectively, and the first plate, the second plate and the linear force transmission beams are connected with the tail door outer plate through mucilage glue. Compared with the prior art, the tail gate provided by the utility model meets the light weight requirement of an automobile, has the advantages of light transmission and wave transmission, can integrate an atmosphere lamp, a high brake lamp, an automobile data recorder and the like, is more suitable for new energy electric vehicles and self-driving automobiles in the future, and better meets the development directions of model diversification, intellectualization, modularization and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of automobiles and relates to an automobile tailgate system, in particular to a composite structure tailgate and an automobile. Background Art

[0002] Currently, the structure of existing composite tailgates usually uses plastic as the inner and outer panels, and adopts a steel frame or aluminum alloy frame for reinforcement. Although the plasticization of the inner and outer panels can achieve the appearance, light transmission, wave transmission and other requirements that traditional sheet metal tailgates cannot meet, in order to ensure the performance, the frame structure needs to be further strengthened. However, the strengthening of the frame structure is relatively complex, the inner and outer panel walls are thick, the number of parts is large, the process is complicated, the tailgate assembly is not lightweight, and the mold processing cycle is long. In addition, the inner and outer panel materials are inconsistent, and the difference in deformation caused by thermal deformation will cause the appearance of the tailgate and surrounding parts to match poorly when the temperature changes. At the same time, due to the limitation of the base material of the outer panel, the polypropylene (PP) material itself has a low Young's modulus and has the characteristic of deformation when heated. In addition, the tailgate has insufficient rigidity, weak dent resistance, and poor appearance. Utility Model Content

[0003] The purpose of the present utility model is to provide a new composite tailgate and a car, which are used to solve the problems of low lightweight, large number of parts, complex structure, complex processing technology, and poor appearance matching in the frame structure of the existing composite tailgate, so as to better realize the mass production of composite tailgates and meet the requirements of automobile tailgates for lightweight, outer panel dent resistance, outer panel stiffness, and gap and surface difference matching. In addition, the solution and concept of the present utility model are applicable to composite car doors and hoods.

[0004] The purpose of the utility model can be achieved through the following technical solutions:

[0005] The first aspect of the present invention provides a composite structure tailgate, including a tailgate outer panel and a tailgate insert injection-molded inner panel, the tailgate insert injection-molded inner panel includes a tailgate inner panel, the tailgate inner panel includes a first panel and a second panel that are bent and connected, the first panel and the second panel are groove panels, and the first panel is an inverted U-shaped groove and is connected to the top side of the second panel to form a hole, a plurality of straight force transmission beams are respectively provided in the groove on the top side of the first panel and the groove on the second panel, the first panel, the second panel and the plurality of straight force transmission beams are connected to the tailgate outer panel by adhesive, which achieves a good sealing effect and an aesthetically pleasing appearance. In addition, the local structure of the tailgate is designed as a straight force transmission beam, and the tailgate inner panel is designed as a U-shaped groove, which reduces the weight compared to the traditional tailgate inner panel, thereby achieving a lightweight tailgate.

[0006] Among them, the bent and connected first and second plates make the tailgate inner panel form a single-section stepped shape, which strengthens the height difference design of the structure, prevents the outer structure of the main beam from sinking or bulging, realizes rigidity enhancement, greatly reduces the number of plastic tailgate reinforcement ribs, and shortens the mold development cycle.

[0007] Furthermore, the tailgate outer panel is injection molded.

[0008] Furthermore, the tailgate insert injection-molded inner panel also includes a D-pillar reinforcement plate and a tailgate lock reinforcement plate. Two D-pillar reinforcement plates are relatively provided and are L-shaped and embedded in the grooves on both sides of the inverted U-shaped groove. The tailgate lock reinforcement plate is located in the middle of the bottom side of the second plate.

[0009] Furthermore, the D-pillar reinforcement plate and the tailgate lock reinforcement plate are selected from stamped sheet metal parts, high-strength carbon fiber molded parts or castings.

[0010] Furthermore, the D-pillar reinforcement plate and the tailgate lock reinforcement plate are made of steel, aluminum or carbon fiber. The D-pillar reinforcement plate can meet the overall rigidity and bending and torsion requirements of the tailgate, while the tailgate lock reinforcement plate can achieve functions such as tailgate opening and closing durability.

[0011] Furthermore, the tailgate outer panel includes an upper tailgate outer panel and a lower tailgate outer panel, wherein the upper tailgate outer panel covers the top side of the inverted U-shaped groove, and the lower tailgate outer panel covers the groove of the second plate, and the inner sides of the upper tailgate outer panel and the lower tailgate outer panel are respectively connected to the tailgate inner panel by adhesive.

[0012] Furthermore, the adhesive is one or more of structural adhesive, 3M adhesive, and expansion adhesive. Structural adhesive with good seismic performance can be selected according to needs to ensure the sealing, rigidity, strength and other requirements of the tailgate.

[0013] Furthermore, the tailgate inner panel is equipped with structural reinforcement beams in various shapes, including a Japanese-shaped, I-shaped, U-shaped, and T-shaped (L-shaped). By combining these beams, the tailgate inner and outer panels form multiple cavities, improving the tailgate's cross-sectional moment. While maintaining the same performance, less material can be used, reducing the tailgate's overall weight and meeting lightweight requirements.

[0014] Furthermore, the tailgate outer panel is a composite panel made of injection-molded PP and PC materials, replacing traditional sheet metal stamping tailgates. The use of a PP and PC composite panel allows for diverse tailgate designs, enabling complex styling features and, consequently, aerodynamic enhancements. Furthermore, the tailgate outer panel offers the advantages of light and wave transmission. Therefore, the upper tailgate outer panel can be integrated with ambient lighting, high-brake lights, and a driving recorder, while the lower tailgate outer panel can be integrated with ambient lighting, matrix lights, and LED screens to meet personalized user needs. The tailgate inner panel is a glass fiber reinforced composite inner panel or a carbon fiber reinforced composite inner panel.

[0015] Furthermore, the tailgate inner panel is a thin-walled inner panel with a thickness of 1.8 to 3.5 cm, so as to further reduce the weight of the tailgate.

[0016] Furthermore, according to the commercial and biotechnical differences of various parts of the tailgate, the inner panel body and the doghouse structure can be glued to the outer panel to form different combinations.

[0017] By combining various beam structures of the tailgate, the tailgate is divided into multiple cavity structures, which increases the cross-sectional inertia moment of the tailgate, reduces the overall weight of the tailgate, and significantly improves the rigidity of the outer panel and the overall rigidity of the tailgate. At the same time, it improves the inconsistent thermal deformation of the inner and outer panels of the tailgate caused by high and low temperatures, thereby better ensuring the appearance of the tailgate matches and ensuring that the tailgate gap and surface difference meet the requirements.

[0018] A second aspect of the present invention provides a car, which is equipped with a tailgate with a composite structure as described in the first aspect.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1) The present invention provides a composite plastic tailgate. The U-shaped groove design of the tailgate inner panel and the multiple straight force transmission beams reduce the weight of the tailgate compared to traditional tailgate inner panels, thereby reducing the weight of the tailgate, meeting the lightweight requirements of automobiles, and improving the driving range of electric vehicles.

[0021] 2) This utility model provides a composite plastic tailgate with a small number of parts and a simple process. The use of PP and PC composite panels allows for diverse styling, enabling the realization of complex features. The panels are light and wave-transmitting, allowing for integration of ambient lighting, high-brake lights, driving recorders, matrix lights, LED screens, and more to meet individual user needs.

[0022] 3) A new composite structure plastic tailgate system solution is proposed. The composite structure tailgate provided is more suitable for future new energy electric vehicles and self-driving cars, meeting the important development directions of styling diversification, intelligence, and modularization. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the tailgate assembly of the present utility model;

[0024] Figure 2 This is an exploded view of the tailgate assembly of the present invention;

[0025] Figure 3 This is an exploded view of the injection-molded inner panel of the tailgate insert of the present invention;

[0026] Figure 4 It is a partial structural diagram of the tailgate inner panel in some embodiments of the present utility model;

[0027] Figure 5 for Figure 4 Middle AA section;

[0028] Description of the marks in the figure:

[0029] 1- Tailgate upper outer panel, 2- Tailgate lower outer panel, 3- Tailgate inner panel, 301- First panel, 302- Second panel, 303- Straight force transmission beam, 4- Adhesive, 5- Straight force transmission beam, 6- D-pillar reinforcement plate, 7- Tailgate lock reinforcement plate;

[0030] A-Schematic diagram of the tailgate outer panel structure, B-Schematic diagram of the adhesive bonding, C-Schematic diagram of the tailgate insert injection molding inner panel structure;

[0031] a-cavity 1, b-cavity 2, c-cavity 3, d-cavity 4. DETAILED DESCRIPTION

[0032] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments. The following embodiments are based on the above-mentioned technical solution of the present invention and provide detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments. The following embodiments and features of the embodiments may be combined with each other unless they conflict.

[0033] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not require further definition or explanation in subsequent drawings.

[0034] In the following embodiments, the adhesive is at least one of structural adhesive, 3M adhesive, and expansion adhesive.

[0035] Example:

[0036] A composite tailgate that can be assembled on a car includes a tailgate outer panel and a tailgate insert injection-molded inner panel. Figures 1 to 3 They are respectively a structural schematic diagram of the tailgate assembly of this embodiment, an exploded diagram of the tailgate assembly, and an exploded diagram of the injection-molded inner panel of the tailgate insert. Figure 2In the figure, A is a schematic diagram of the tailgate outer panel structure, B is a schematic diagram of the adhesive, and C is a schematic diagram of the tailgate insert injection-molded inner panel structure. The tailgate insert injection-molded inner panel includes a tailgate inner panel 3, a D-pillar reinforcement plate 6 and a tailgate lock reinforcement plate 7. The tailgate inner panel 3 is a glass fiber reinforced composite material inner panel or a carbon fiber reinforced composite material inner panel. The tailgate inner panel 3 includes a first plate 301 and a second plate 302 that are bent and connected. The first plate 301 and the second plate 302 are grooved plates, and the first plate 301 is an inverted U-shaped groove and is connected to the top side of the second plate 302 to form a hole. A plurality of straight force transmission beams 303 are respectively provided in the groove on the top side of the first plate 301 and the groove on the second plate 302. The first plate 301, the second plate 302 and the plurality of straight force transmission beams 303 are connected to the tailgate outer panel by adhesive 4, which ensures the sealing, rigidity and strength requirements of the tailgate, and achieves a good sealing effect and aesthetic appearance. In addition, the U-shaped groove design and the arrangement of multiple straight force transmission beams 303 on the tailgate inner panel 3 reduce weight compared to the traditional tailgate inner panel, thus achieving lightweight tailgate. Among them, the first plate 301 and the second plate 302 connected by bending make the tailgate inner panel 3 form a single-stage stepped shape, strengthen the height difference design of the structure, prevent the outer structure of the main beam from sinking or bulging, achieve enhanced rigidity, greatly reduce the number of plastic tailgate reinforcement ribs, and shorten the mold development cycle. The D-pillar reinforcement plate 6 and the tailgate lock reinforcement plate 7 can be any one of aluminum plate stampings, steel plate stampings, aluminum castings or carbon fiber molded parts. Two D-pillar reinforcement plates 6 are arranged opposite to each other and are respectively embedded in the grooves on both sides of the inverted U-shaped groove. The tailgate lock reinforcement plate 7 is located in the middle of the bottom side of the second plate, as shown in FIG. Figure 3 As shown, the D-pillar reinforcement plate 6 meets the overall stiffness and torsional bending requirements of the tailgate, while the tailgate lock reinforcement plate 7 ensures durability and other functions. The tailgate outer panel is a composite panel made of injection-molded PP and PC materials, consisting of an upper tailgate outer panel 1 and a lower tailgate outer panel 2. This composite panel replaces the traditional sheet metal stamping tailgate, allowing for diverse tailgate designs and complex styling features, thereby enhancing aerodynamic characteristics. The upper tailgate outer panel 1 overlies the top of the inverted U-shaped groove, while the lower tailgate outer panel 2 overlies the groove of the second plate 302. The inner surfaces of the upper and lower tailgate outer panels 1 and 2 are respectively connected to the outer edges of the corresponding straight-line force transmission beams 303 via adhesive 4. Furthermore, the tailgate outer panels offer the advantages of light and wave transmission. Therefore, the upper tailgate outer panel 1 can be integrated with ambient lighting, high-speed brake lights, and driving recorders, while the lower tailgate outer panel 2 can be integrated with ambient lighting, matrix lights, LED screens, and other features to meet user needs. Figure 4 This is a partial structural diagram of the tailgate inner panel in some embodiments of the present invention. Figure 5 for Figure 4In the middle AA cross-sectional view, it can be seen that in these embodiments, the tailgate inner panel 3 is further provided with a Japanese-shaped, I-shaped, U-shaped, and T (L)-shaped structural reinforcement beams. Through the combination of various beams, the tailgate inner panel and the outer panel are formed into multiple cavities, which improves the cross-sectional moment of the tailgate. Under the premise of meeting the same performance, less material can be used to achieve the purpose of lightweighting, and significantly improve the rigidity of the outer panel and the overall rigidity of the tailgate. At the same time, it improves the problem of inconsistent thermal deformation of the inner and outer panels of the tailgate caused by high and low temperatures, thereby better ensuring the appearance matching of the tailgate and ensuring that the tailgate seam gap and surface difference meet the requirements.

[0037] The tailgate upper outer panel 1, the tailgate lower outer panel 2, and the tailgate insert injection molded inner panel are connected together by adhesive 4 to form the tailgate assembly of this embodiment. Figure 1 As shown, the tailgate assembly is the main performance-bearing structure of the tailgate of the present invention. The tailgate assembly process of this embodiment is as follows: First, the tailgate inner panel 3, the D-pillar reinforcement plate 6, and the tailgate lock reinforcement plate 7 are integrally formed into a tailgate insert injection-molded inner panel in a mold through an insert injection process. Then, the tailgate upper outer panel 1 and the tailgate lower outer panel 2 are molded in the mold through an insert injection process. The tailgate insert injection-molded inner panel is then placed in a tire membrane for fixation. The tailgate upper outer panel 1 and the tailgate lower outer panel 2 are placed in another tire membrane. Glue 4 is applied to the corresponding positions of the tailgate upper outer panel 1 and the tailgate lower outer panel 2. The glued tailgate upper outer panel 1 and the tailgate lower outer panel 2 are then bonded to the tailgate insert injection-molded inner panel through the tire membrane, thus forming the plastic tailgate assembly of this embodiment.

[0038] The above description of the embodiments is intended to facilitate understanding and use of the utility model by those skilled in the art. Those skilled in the art will readily be able to make various modifications to these embodiments and apply the general principles described herein to other embodiments without requiring inventive effort. Therefore, the utility model is not limited to the above-described embodiments. Improvements and modifications made by those skilled in the art based on the disclosure of this utility model without departing from the scope of this utility model should be within the scope of protection of this utility model.

Claims

1. A composite tailgate, characterized in that: The invention comprises a tailgate outer panel and a tailgate insert injection-molded inner panel, wherein the tailgate insert injection-molded inner panel comprises a tailgate inner panel (3), wherein the tailgate inner panel (3) comprises a first panel (301) and a second panel (302) connected by bending, wherein the first panel (301) and the second panel (302) are groove panels, and the first panel (301) is an inverted U-shaped groove and is connected to the top side of the second panel (302) to form a hole, wherein a plurality of straight force transmission beams (303) are respectively provided in the groove on the top side of the first panel (301) and the groove on the second panel (302), and the first panel (301), the second panel (302) and the plurality of straight force transmission beams (303) are connected to the tailgate outer panel by adhesive (4).

2. The composite tailgate according to claim 1, characterized in that: The tailgate outer panel is injection molded.

3. The composite tailgate according to claim 1, characterized in that: The tailgate insert injection molded inner plate further comprises a D-pillar reinforcement plate (6) and a tailgate lock reinforcement plate (7), wherein two D-pillar reinforcement plates (6) are provided opposite to each other and are L-shaped and embedded in grooves on both sides of the inverted U-shaped groove, and the tailgate lock reinforcement plate (7) is located in the middle of the bottom side of the second plate (302).

4. The composite tailgate according to claim 3, characterized in that: The D-pillar reinforcement plate (6) and the tailgate lock reinforcement plate (7) are selected from stamped sheet metal parts, molded parts or castings.

5. The composite tailgate according to claim 3, characterized in that: The D-pillar reinforcement plate (6) and the tailgate lock reinforcement plate (7) are steel plates, aluminum plates or carbon fiber plates.

6. The composite tailgate according to claim 1, characterized in that: The tailgate outer panel comprises an upper tailgate outer panel (1) and a lower tailgate outer panel (2), wherein the upper tailgate outer panel (1) covers the top side of the inverted U-shaped groove, and the lower tailgate outer panel (2) covers the groove of the second plate (302), and the inner side surfaces of the upper tailgate outer panel (1) and the lower tailgate outer panel (2) are respectively connected to the tailgate inner panel (3) by adhesive (4).

7. The composite tailgate according to claim 1, characterized in that: The viscose (4) is one or more of structural adhesive, 3M adhesive, and expansion adhesive.

8. The composite tailgate according to claim 1, characterized in that: The tailgate inner plate (3) is further provided with a Japanese-shaped, I-shaped, U-shaped, and T-shaped structural reinforcement beam.

9. The composite tailgate according to claim 1, characterized in that: The tailgate outer panel is a composite material outer panel formed by injection molding of PP and PC materials, and the tailgate inner panel (3) is a glass fiber reinforced composite material inner panel or a carbon fiber reinforced composite material inner panel.

10. An automobile, characterized in that: The automobile is equipped with a tailgate with a composite structure as described in any one of claims 1 to 9.

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