A sandwich structure automobile front anti-collision beam and assembly

Abstract

The present invention discloses a novel sandwich structure automobile front anti-collision beam and assembly, the anti-collision beam comprises a tubular aluminum alloy shell, the shell is provided with aluminum foam, two-layer lattice structure and honeycomb structure inside, the honeycomb structure is filled between the two-layer lattice structure, the two-layer lattice structure comprises a first lattice structure arranged on a side away from the automobile, the first lattice structure comprises a plurality of interconnected first unit cells in the shape of a structure, and the aluminum foam is filled in the gap between the two-layer lattice structure and the inner wall of the shell. The present invention has the advantages of absorbing impact energy, reducing impact peak force and being conducive to achieving lightweight of automobiles.

Description

Technical Field

[0001] The invention relates to a sandwich structure automobile front anti-collision beam and an assembly. Background Art

[0002] In today's society, with the rapid development of the economy, cars have become an essential means of transportation for families. The per capita car ownership in my country is increasing, which leads to frequent traffic accidents, which has a huge impact on people's life and property safety. In addition, the emission of automobile exhaust and energy consumption also bring huge pressure to my country's environment and energy; therefore, in recent years, people have been committed to the fields of automobile safety and lightweight, while the field of active automobile safety has been perfected, and the field of passive safety still needs to be improved, including automobile energy absorption boxes, front and rear anti-collision beams, airbags and side impact rods; when a car collides, the above-mentioned passive safety devices undergo plastic deformation to absorb the energy generated by the impact and protect people's life, health and safety. It is worth noting that the front anti-collision beam of a car is the first protective component of a frontal collision of a car, and its energy absorption effect is crucial. The traditional front anti-collision beam of a car is only made of a simple high-strength steel beam. When a frontal collision of a car occurs, its energy absorption and protection capabilities are generally average, and it cannot really play a good protective effect. Moreover, due to the high density of high-strength steel, its overall mass is also large, so it cannot achieve the lightweight design of the car. Therefore, it is necessary to design a new front anti-collision beam structure that can not only meet the overall strength of the front anti-collision beam but also absorb more impact energy smoothly and efficiently when an impact occurs, and to minimize its own weight, reduce the weight of the car, reduce emissions, and achieve lightweight. In recent years, some lightweight and high-strength structures or materials have been continuously discovered by humans, such as lightweight aluminum alloy honeycombs and lattice structures with high specific strength and specific stiffness. They all have high comprehensive performance in energy absorption and lightweight, and can be considered to be adopted in the design of the front anti-collision beam structure of the car to obtain the expected results. Therefore, designing a front anti-collision beam for a car has very important practical significance and value. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a sandwich structure automobile front anti-collision beam and assembly.

[0004] The technical solution adopted by the present invention to solve the technical problem is:

[0005] A sandwich structure automobile front anti-collision beam, comprising a tubular aluminum alloy shell, wherein aluminum foam, two-layer lattice structure and honeycomb structure are arranged inside the shell, wherein the honeycomb structure is filled between the two-layer lattice structure, wherein the two-layer lattice structure comprises a first lattice structure arranged on a side away from the automobile, wherein the first lattice structure comprises a plurality of interconnected Figure 4In the first unit cell shown, the aluminum foam is filled in the gap between the two-layer lattice structure and the inner wall of the shell;

[0006] The honeycomb structure comprises a plurality of first cylindrical through holes with a first regular hexagonal cross section, wherein a second cylindrical through hole with a second regular hexagonal cross section is arranged in the first cylindrical through hole; the six corners of the second regular hexagon respectively coincide with the midpoints of the six sides of the first regular hexagon; a hollow cylinder is arranged at the central axis of the first cylindrical through hole, and six metal plate feet connected to the six corners of the second cylindrical through hole are arranged in sequence on the side of the hollow cylinder; the angle between adjacent metal plate feet is 60°, and the cross section of the honeycomb structure is as follows: Figure 5 As shown;

[0007] The two-layer lattice structure includes a second lattice structure arranged on a side close to the car, the second lattice structure includes a plurality of second unit cells connected to each other, and the second unit cells are hollowed out and formed by six X-shaped truss rods. Figure 7 The hexahedron shown;

[0008] Lightweight carbon fiber plates are respectively arranged between the honeycomb structure and the two-layer lattice structure. The two-layer lattice structure is made of stainless steel. The honeycomb structure is made of aluminum or aluminum alloy.

[0009] In a preferred embodiment, the shell is connected to the two layers of lattice structure and the honeycomb structure respectively by spot welding.

[0010] A sandwich structure automobile front anti-collision assembly, comprising the anti-collision beam described in the previous embodiment, wherein a multi-cell tube penetrating the gradient energy absorption box is provided inside the gradient energy absorption box, and the cross section of the gradient energy absorption box is as follows: Fig. 9 As shown and described.

[0011] In a preferred embodiment, the anti-collision beam and the gradient energy absorption box are rigidly connected.

[0012] The beneficial effects of the present invention are:

[0013] 1. The aluminum alloy shell has low rigidity and is prone to plastic deformation. When a collision occurs, it initially absorbs the impact energy through its stable deformation mode. After that, the aluminum alloy shell transfers most of the energy to the internal aluminum foam material. The aluminum foam material has a low density and significant porous characteristics, and has a good effect in absorbing high impact energy. It absorbs the impact energy by squeezing its pores and reduces the impact peak force. After that, the impact energy is transmitted to the internal two-layer lattice structure and honeycomb structure. The lattice structure has good rigidity and strength, which makes the impact resistance of the anti-collision beam stronger. At the same time, when the truss rod of the lattice structure collapses and breaks, it can absorb a lot of energy by its porous characteristics. At the same time, the aluminum alloy honeycomb structure between the two layers of lattice structures will undergo step-by-step folding deformation, and the folding wave will absorb the impact energy. The gradient energy absorption box is used in conjunction with the anti-collision beam, which is conducive to absorbing the impact energy from different angles of the anti-collision beam, and the multi-cellular structure is used inside the box body, which significantly enhances the overall rigidity and energy absorption effect of the energy absorption box. The two cooperate with each other, greatly improving the practicality of the first protective barrier of the car, and effectively ensuring the safety and stability of the interior of the car.

[0014] 2. The honeycomb structure improves the traditional hexagonal honeycomb, which helps to reduce the peak collision force and induce the formation of folding waves, making the energy absorption process of the honeycomb structure more stable and significantly improving the total energy absorption.

[0015] 3. The multi-cellular gradient energy-absorbing box can absorb impact energy in different directions by utilizing its gradient characteristics. The number of folded waves increases, and the internal multi-cellular characteristics enhance the overall stiffness of the energy-absorbing box, further improving the stable and efficient energy absorption of the energy-absorbing box.

[0016] 4. The first lattice structure relies on the position of its internal truss rods to absorb a large amount of energy stably and efficiently, while the second lattice structure is compact and uses its X-shaped truss rods to ensure the rigidity and strength of the anti-collision beam, avoiding the unstable transfer of excessive energy to the energy absorption box of the car, causing local energy concentration in the energy absorption box and losing the purpose of energy absorption.

[0017] 5. It mainly uses lightweight materials such as aluminum alloy, aluminum foam and stainless steel. The structure is mainly porous, which reduces the relative density of the structure. Therefore, while ensuring the overall structural rigidity and energy absorption effect, the total mass is low, which reduces the burden on the car and is conducive to achieving lightweighting of the car.

[0018] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments, but the sandwich structure automobile front anti-collision beam and assembly of the present invention are not limited to the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of an anti-collision beam of a preferred embodiment of the present invention;

[0020] Figure 2is a cross-sectional view of an anti-collision beam according to a preferred embodiment of the present invention;

[0021] Figure 3 is a structural schematic diagram of a first lattice structure of a preferred embodiment of the present invention;

[0022] Figure 4 is a schematic structural diagram of a first unit cell of a first lattice structure of a preferred embodiment of the present invention;

[0023] Figure 5 is a cross-sectional view of a honeycomb structure of a preferred embodiment of the present invention;

[0024] Figure 6 is a structural schematic diagram of a second lattice structure of a preferred embodiment of the present invention;

[0025] Figure 7 is a schematic structural diagram of a second unit cell of a second lattice structure of a preferred embodiment of the present invention;

[0026] Figure 8 It is a side view of a gradient energy absorption box according to a preferred embodiment of the present invention;

[0027] Fig. 9 It is a cross-sectional view of a gradient energy absorption box according to a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0028] See also Figures 1 to 9 As shown, a sandwich structure automobile front anti-collision assembly of the present invention includes an anti-collision beam and a gradient energy absorption box 70 rigidly connected to the anti-collision beam, the anti-collision beam includes a tubular aluminum alloy shell 10, the shell 10 is provided with aluminum foam 20, two layers of lattice structure and a honeycomb structure 40 made of metal aluminum, the shell 10 is respectively connected to the two layers of lattice structure and the honeycomb structure 40 by spot welding, the honeycomb structure 40 is filled between the two layers of lattice structure, the two layers of lattice structure include a first lattice structure 30 arranged on a side away from the car and a second lattice structure 50 arranged on a side close to the car, the first lattice structure 30 includes a plurality of interconnected structures such as Figure 4 The second lattice structure 50 includes a plurality of second cells 51 connected to each other, and the second cell 51 is composed of six X-shaped truss rods. Figure 7 The hexahedron shown in the figure, the two-layer lattice structure is made of 316L stainless steel by 3D printing, the aluminum foam 20 is filled in the gap between the two-layer lattice structure and the inner wall of the shell 10, and a lightweight carbon fiber plate 60 is respectively provided between the honeycomb structure 40 and the two-layer lattice structure.

[0029] See also Figure 5As shown, the honeycomb structure 40 includes a plurality of first cylindrical through holes with a first regular hexagonal cross section, and a second cylindrical through hole with a second regular hexagonal cross section is arranged in the first cylindrical through hole; the six corners of the second regular hexagon coincide with the midpoints of the six sides of the first regular hexagon respectively; a hollow cylinder is arranged at the central axis of the first through hole, and six metal plate feet connected to the six corners of the second cylindrical through hole are arranged on the side surface of the hollow cylinder in sequence; the angle between adjacent metal plate feet is 60°.

[0030] See also Figure 8 and Fig. 9 As shown, the gradient energy absorption box 70 includes a hollow regular tetrahedron and a multicellular tube 71, wherein the multicellular tube 71 includes a hollow rectangular parallelepiped with a square bottom surface arranged on the central axis of the regular tetrahedron; on the same cross section, the cross section of the tetrahedron is a first square, and the cross section of the rectangular parallelepiped is a second square, and the diagonals of the second square are respectively perpendicular to the two sets of opposite sides of the second square; each side edge of the rectangular parallelepiped is provided with two trapezoidal metal plate feet respectively used to connect the two side edges of the regular tetrahedron adjacent to the side edges of the rectangular parallelepiped.

[0031] In this embodiment, the gap between the two-layer lattice structure and the aluminum alloy shell 10 is filled with aluminum foam 20 material. This type of material has both metal and bubble characteristics, low density, only 0.1-0.4 times that of metal aluminum, high impact absorption ability, sound insulation and noise reduction, and corrosion resistance. It can be used as a buffer material to filter the impact on the aluminum alloy shell 10 and then transfer it to the internal two-layer lattice structure to avoid premature failure of the two-layer lattice structure or honeycomb structure 40 due to excessive peak force and loss of energy absorption. In addition, its corrosion resistance is used to further protect the internal structure from damage. There is a layer of lightweight carbon fiber plate 60 between the two-layer lattice structure and the honeycomb structure 40 inside the anti-collision beam. Relying on its high tensile strength and strong impact resistance, the stability of energy transfer between layers is guaranteed. The construction principle of the honeycomb structure 40 is mainly composed of the original six The improvement of the polygonal honeycomb helps to reduce the peak collision force and induce the formation of folding waves, making the energy absorption process of the honeycomb structure 40 more stable, and the total energy absorption is also greatly improved. At the same time, with the help of the good ductility and plastic deformation ability of aluminum materials, the energy transition between the two layers of lattice structures can be guaranteed. The energy absorption box matched with the anti-collision beam adopts a gradient design, and the interior is a multi-cellular tube 71. The energy absorption capacity of the tube is enhanced by the synergistic effect of the cell wall. The gradient design can cope with impacts in different directions well, and absorb the energy transmitted from the anti-collision beam as much as possible to ensure the safety and stability of the interior of the car. In short, the front anti-collision beam designed by the present invention utilizes a combination of porous structure and lightweight materials, and works together with the gradient energy absorption box 70 to achieve stable and efficient energy absorption, and is conducive to the lightweight of the car, and can perfectly serve as the first line of defense when the car collides.

[0032] The above embodiments are only used to further illustrate a sandwich structure automobile front anti-collision beam and assembly of the present invention, but the present invention is not limited to the embodiments. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention fall within the protection scope of the technical solution of the present invention.

Claims

1. A sandwich structure front anti-collision beam for automobiles, characterized in that: It comprises a tubular aluminum alloy shell, wherein aluminum foam, two-layer lattice structure and honeycomb structure are arranged inside the shell, wherein the honeycomb structure is filled between the two-layer lattice structure, wherein the two-layer lattice structure comprises a first lattice structure arranged on a side away from the vehicle, wherein the first lattice structure comprises a plurality of first unit cells connected to each other, and wherein the aluminum foam is filled in the gap between the two-layer lattice structure and the inner wall of the shell; The honeycomb structure comprises a plurality of first cylindrical through holes with a first regular hexagonal cross section, wherein a second cylindrical through hole with a second regular hexagonal cross section is arranged in the first cylindrical through hole; the six corners of the second regular hexagon respectively coincide with the midpoints of the six sides of the first regular hexagon; a hollow cylinder is arranged at the central axis of the first cylindrical through hole, and six metal plate feet connected to the six corners of the second cylindrical through hole are arranged on the side of the hollow cylinder in sequence; the angle between adjacent metal plate feet is 60°; The two-layer lattice structure includes a second lattice structure arranged on a side close to the car, the second lattice structure includes a plurality of second unit cells connected to each other, and the second unit cell is a hollow hexahedron composed of six X-shaped truss rods; Lightweight carbon fiber plates are respectively arranged between the honeycomb structure and the two-layer lattice structure. The two-layer lattice structure is made of stainless steel. The honeycomb structure is made of aluminum or aluminum alloy.

2. The sandwich structure automobile front anti-collision beam according to claim 1, characterized in that: The shell is respectively connected with the two-layer lattice structure and the honeycomb structure by spot welding.

3. A sandwich structure automobile front anti-collision assembly, characterized in that: It comprises the anti-collision beam according to any one of claims 1 to 2, wherein a multi-cell tube penetrating the gradient energy absorption box is arranged inside the gradient energy absorption box.

4. The sandwich structure automobile front anti-collision assembly according to claim 3 is characterized in that: The anti-collision beam is rigidly connected to the gradient energy absorption box.

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