CN110645298A - A double-platform filling structure with double protection - Google Patents

Abstract

The invention discloses a double-platform filling structure with double protection, comprising at least four micro-cells, and the micro-cells are composed of two symmetrical concave triangular cell bodies; the concave triangular cell body It includes a first energy-absorbing part and a second energy-absorbing part with the same structure; the top and bottom of the first and second energy-absorbing parts are connected by a connecting block; the first energy-absorbing part includes an upper horizontal connecting part , the first energy-absorbing part, the second energy-absorbing part, the force-transmitting part, the third energy-absorbing part, and the lower horizontal connecting part; the micro-cells are arranged and combined in the X and Y directions in turn, and two adjacent groups of micro-cells are An octagonal energy-absorbing area is formed between them, and the filling structure can realize the bidirectional protection function of people and cars by using the octagonal energy-absorbing area.

Description

A double-platform filling structure with double protection

technical field

The invention belongs to the field of automobile parts, in particular to a double-platform filling structure with double protection.

Background technique

The anti-collision beam, the energy-absorbing box and the front longitudinal beam constitute the main energy-absorbing components of the front end of the car; among them, the energy-absorbing box plays a crucial role in a low-speed collision. In recent years, there have been many patents and academic studies on the performance improvement of the energy-absorbing box, which can be roughly divided into two forms: one is to optimize the cross-sectional shape of the energy-absorbing box, and the other is to fill the energy-absorbing box with light weight. Energy absorbing material. Chinese patent CN209079843U discloses "a new type of energy-absorbing box with multiple cross-sections", which realizes the stability of the energy-absorbing process through the change of cross-section. Chinese patent CN109532730A discloses "a new type of automobile energy-absorbing box device with special internal filling, the energy-absorbing box utilizes hexagonal thin-walled tubes and internal filling structures to absorb more collision energy and overcome the initial peak force of traditional energy-absorbing boxes. high energy absorption, unstable, unsustainable and low efficiency; Chinese patent CN110015255A discloses "an energy-absorbing box with a star-shaped cell structure", which uses the deformation of star-shaped cell units to absorb more energy. More collision energy. Although the above-mentioned patents all use the filling structure to improve the energy-absorbing performance of the energy-absorbing box from different angles, they all belong to one-way protection, that is, absorb more energy to buffer the damage to the collided vehicle. However, Due to the diversity of automobile collisions, including collisions between automobiles, collisions between people and automobiles, and collisions between non-motor vehicles and automobiles, when the collision is in the form of a collision between a person or a cyclist and a car When two-way protection is required, the energy-absorbing box with the existing filling structure cannot meet the demand, because at this time, not only the degree of damage to the car needs to be reduced, but also the safety of people or bicycles they ride must be protected.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a double-platform filling structure with double protection, so as to solve the problem that the filling structure in the existing energy-absorbing box is one-way protection, and the collision form is between a person or a cyclist and a car. When the two-way protection is used, it is impossible to achieve the technical problem of reducing the damage to the car and protecting the safety of people at the same time.

To achieve the above object, the present invention adopts the following technical solutions to realize:

A double-platform filling structure with double protection, comprising at least four micro cells, the improvement is: the micro cells are composed of two symmetrical concave triangular cells; the concave triangular cells The element body includes a first energy absorbing part and a second energy absorbing part; the first energy absorbing part and the second energy absorbing part have the same structure, and the top and bottom of the first energy absorbing part and the second energy absorbing part pass through a The connecting blocks are connected to form a whole; the first energy absorbing part includes an upper horizontal connecting part, a first energy absorbing part, a second energy absorbing part, a force transmitting part, a third energy absorbing part, and a lower horizontal connecting part; The upper horizontal connection part is connected to the first energy absorbing part, the first energy absorbing part is connected to the second energy absorbing part, and the angle α between the first energy absorbing part and the second energy absorbing part is 135 -170°; the second energy-absorbing part is connected with the force-transmitting part; the force-transmitting part is connected with the third energy-absorbing part, and the force-transmitting part includes two horizontal force-transmitting connecting parts and one vertical force-transmitting connecting part, The two horizontal force-transmitting connection parts are respectively connected with the second energy-absorbing part and the third energy-absorbing part, and the two symmetrical concave triangular cell bodies are connected by the lower horizontal force-transmitting connection part; The direct force connecting part is used to connect with another micro cell; the third energy absorbing part is connected with the lower horizontal connecting part, and the angle β between the third energy absorbing part and the lower horizontal connecting part is 140-180° , the micro cells are arranged and combined sequentially in the X direction and the Y direction, so that an octagonal energy absorption area is formed between the adjacent two groups of micro cells.

As a preferred option of the present invention, the concave triangular cell body further includes a third energy absorbing member and a fourth energy absorbing member; the structures of the third energy absorbing member and the fourth energy absorbing member are the same as those of the first energy absorbing member. The structure is the same, the third energy absorbing member and the fourth energy absorbing member are respectively fixed on the other two surfaces of the connecting block, the third energy absorbing member and the first energy absorbing member form a 90° angle, and the fourth energy absorbing member A 90° angle is formed with the second energy absorbing member, and a double platform filling structure is formed by arranging and combining the micro cells in the X direction, the Y direction and the Z direction in sequence.

As a preferred option of the present invention, the double-platform filling structure is a 3D-printed one-piece structure, the length a of the upper horizontal plane of the concave triangular cell body is 4-8 mm; the first energy absorption part, the second energy absorption part The wall thickness b of the energy part and the third energy absorbing part is the same, and both are 1-2mm.

The double-platform filling structure of the present invention can be obtained by a two-dimensional array of microcells, that is, only the microcells are arranged in the X direction and the Y direction in turn, and the Z direction is controlled by controlling the thickness of the microcells, and then the microcells are used. A group of octagonal structures formed in the middle of the cell achieves double protection. The filling structure can be filled on the crash beam of the car, so that double protection can be achieved; when the concave triangular cell body on the microcell also When the third and fourth energy-absorbing parts are included, a double-platform filling structure can be obtained through a three-dimensional array of micro-cells, that is, micro-cells are arranged in the X, Y, and Z directions in turn, so that the entire filling structure is filled. Two sets of mutually perpendicular octagonal structures will be formed in the structure to further improve the energy absorption effect. The double-platform filling structure obtained by using a three-dimensional array is suitable for filling components with regular structures, such as the energy-absorbing box of the automobile (the energy-absorbing box of the energy-absorbing box). The outer skin can be a hollow cylindrical cylinder, or a hollow quadrilateral, hexagonal and other polygonal cylinder), and the double-platform filling structure can be directly filled in the outer skin of the energy-absorbing box during use.

As a further preference of the present invention, the material of the micro cells is aluminum or other metal materials.

Compared with the prior art, the advantages and beneficial effects of the present invention are:

(1) The double-platform filling structure provided by the present invention is based on the improvement of the connection relationship of the existing concave triangular cell structure. As a result, it is unexpectedly found that the symmetrically designed concave triangular cell is used as the micro cell. The micro-cells are arranged and combined in the X, Y, or X, Y, and Z directions in turn, so that an octagonal energy-absorbing area can be formed between adjacent micro-cells. In the subsequent deformation, the octagonal energy-absorbing area Transition to the quadrilateral energy absorption area, thus forming the switching of the dual platform, realizing the two-way protection function for people and cars.

(2) When the double-platform filling structure provided by the present invention is impacted by a collision, the overall structure exhibits a deformation mode of zero Poisson's ratio effect during the deformation process, that is, the material is only deformed along the axial impact direction, and the material is only deformed along the impact direction perpendicular to the impact direction. The deformation is very small; and there is a "double platform" phenomenon in the process of deformation energy absorption, that is, the first platform is quickly generated at the beginning of the impact, and then the second platform is generated, and the second platform is raised relative to the first platform. The first platform with lower height and reaction force is used to protect people or bicycles that people ride, etc., because a lower continuous and stable reaction force is very beneficial to protect people or bicycles that people ride, if the fluctuation is large or the platform A higher value will cause people to be subjected to a larger impact force or dynamic load of periodic frequency, resulting in instant damage, and the second platform is used to protect the car body.

(3) The double-platform filling structure provided by the present invention has a deformation mode of zero Poisson's ratio effect, so it can be used on the energy-absorbing box, which can realize stable deformation of the entire energy-absorbing box and prevent the material from lateral expansion, extrusion, suction, etc. Can be skinned outside the box.

(4) The dual-platform filling structure provided by the present invention has a simple structure and can be fabricated in combination with a 3D printing process, and a metal material with good toughness is used as the printing material, so as to realize the lightweight of the automobile and reduce the fuel consumption of the automobile.

Description of drawings

FIG. 1 is a schematic diagram of the overall structure of the double platform filling structure of the present invention arranged and combined in the X direction and the Y direction.

FIG. 2 is a front view of the arrangement and combination of the dual-platform filling structure of the present invention in the X and Y directions.

FIG. 3 is a schematic diagram of the overall structure of the arrangement and combination of the double-platform filling structure of the present invention in the X, Y, and Z directions.

FIG. 4 is a front view of the arrangement and combination of the double-platform filling structure of the present invention in the X, Y, and Z directions.

Figure 5 is a front view of a concave triangular cell body.

FIG. 6 is a diagram showing the deformation process of the filling structure in the process of collision and impact.

Fig. 7 is a graph showing the variation of force with displacement in the simulation under the condition of medium and low speed collision.

Detailed ways

In order to enable those skilled in the art to better understand the technical solutions and advantages of the present invention, the present application is described in detail below with reference to the accompanying drawings, but is not intended to limit the protection scope of the present invention.

Referring to Fig. 1, Fig. 2 and Fig. 5, a double-platform filling structure with double protection provided by the present invention includes at least four micro-cells, and the micro-cells are composed of two symmetrical concave triangular cell bodies 1 The concave triangular cell body includes a first energy-absorbing member 11 and a second energy-absorbing member 12; the first energy-absorbing member 11 and the second energy-absorbing member 12 have the same structure, and the first energy-absorbing member , The top and bottom of the second energy-absorbing member are connected by a connecting block 15 to form a whole; the first energy-absorbing member includes an upper horizontal connecting portion 111, a first energy-absorbing portion 112, and a second energy-absorbing portion. 113. The force transmission part 114, the third energy absorption part 115, and the lower horizontal connection part 116; wherein, the upper horizontal connection part 111 is connected with the first energy absorption part 112, and the first energy absorption part 112 is connected with the second energy absorption part 112. The energy part 113 is connected, and the angle α between the first energy absorption part and the second energy absorption part is 135-170°; the second energy absorption part 113 is connected with the force transmission part 114; the force transmission part 114 is connected to the The third energy-absorbing part 115 is connected, and the power-transmitting part includes two horizontal force-transmitting connecting parts 1141, 1143 and one vertical force-transmitting connecting part 1142, and the two horizontal force-transmitting connecting parts are respectively connected with the second energy-absorbing part, The third energy absorbing part is connected, and two symmetrical concave triangular cells are connected through the horizontal force transmission connection part 1143; the vertical force transmission connection part 1142 is used to connect with another micro cell; the third The three energy absorbing parts are connected with the lower horizontal connecting part, the angle β between the third energy absorbing part and the lower horizontal connecting part is 140-180°, and the micro cells are arranged and combined in the X direction and the Y direction in turn, so that the phase An octagonal energy-absorbing area is formed between two adjacent groups of microcells.

Referring to FIGS. 3 and 4 , the concave triangular cell body further includes a third energy absorbing member 13 and a fourth energy absorbing member 14 ; the structures of the third energy absorbing member 13 and the fourth energy absorbing member 14 are the same as the first An energy absorbing member has the same structure, the third energy absorbing member and the fourth energy absorbing member are respectively fixed on the other two surfaces of the connecting block 15, and a 90° angle is formed between the third energy absorbing member and the first energy absorbing member , a 90° angle is formed between the fourth energy absorbing member and the second energy absorbing member, and a double platform filling structure is formed by arranging and combining the micro cells in the X direction, the Y direction and the Z direction in sequence.

Continuing to refer to FIG. 5 , the double-platform filling structure is a 3D printed one-piece structure, the length a of the upper horizontal plane of the concave triangular body is 4-8 mm; the first energy absorbing part 112 , the second absorbing The wall thickness b of the energy portion 113 and the third energy absorbing portion 115 is the same, and both are 1-2 mm.

When the double-platform filling structure of the present invention is filled on the energy absorbing box, the number of filling layers is generally 4-6 layers, and the dimensions of C and L are determined by the overall size of the energy absorbing box and the number of filling layers.

Referring to FIGS. 6 and 7 , when the double-platform filling structure provided by the present invention is subjected to a collision impact, the inner filling structure exhibits a deformation mode of zero Poisson’s ratio effect, that is, the material is only deformed along the axial impact direction, and the material is only deformed along the impact direction perpendicular to the impact. The directional deformation is very small; in addition, by observing the change curve of force versus displacement during the impact process under medium and low speed collision conditions, it can be observed that there is a "double platform" phenomenon in the internal structure during the deformation and energy absorption process, and at the beginning of the impact The first platform is quickly generated, and then the second platform is generated. The second platform is raised by a certain height H relative to the first platform. The first platform with lower reaction force is used to protect people or bicycles that people ride, etc. A low continuous and stable reaction force is very beneficial. If the fluctuation is large or the platform value is high, the person will be subjected to a large impact force or a dynamic load with a periodic frequency, resulting in instant damage. At the same time, the protection of the car body should also be considered, because the larger the area enclosed by the curve, the more energy absorbed, and the less the damage to the car body will be. Therefore, the appearance of the second platform mainly protects the car body, The higher plateau value of the second plateau is beneficial for the structural deformation to absorb more energy.

working principle:

From the deformation process diagram, we can find that: during the impact process, the overall uniform deformation state is presented. First, the left and right cell walls are shrunk layer by layer, so that the energy absorption area of the interlayer octagonal structure becomes the energy absorption area of the quadrilateral structure. , and then form deformation belts at the impact end and the fixed end respectively for alternate deformation and crushing; the first platform area is mainly caused by the interlayer octagonal deformation characteristics, and the second platform area is caused by the interlayer quadrilateral deformation characteristics. , thus realizing this long and stable "dual platform" phenomenon.

Claims (3)

1. A dual-platform filling structure with dual protection comprises at least four microcells, and is characterized in that: the microcell is formed by combining two symmetrical concave triangular cell bodies; the concave triangular cell body comprises a first energy absorbing piece and a second energy absorbing piece; the first energy-absorbing piece and the second energy-absorbing piece are identical in structure, and the top ends and the bottoms of the first energy-absorbing piece and the second energy-absorbing piece are connected through a connecting block to form a whole; the first energy absorbing part comprises an upper horizontal connecting part, a first energy absorbing part, a second energy absorbing part, a force transmission part, a third energy absorbing part and a lower horizontal connecting part; the upper horizontal connecting part is connected with the first energy absorbing part, the first energy absorbing part is connected with the second energy absorbing part, and an included angle alpha between the first energy absorbing part and the second energy absorbing part is 135-170 degrees; the second energy absorption part is connected with the force transmission part; the force transmission part is connected with the third energy absorption part and comprises two horizontal force transmission connecting parts and a vertical force transmission connecting part, the two horizontal force transmission connecting parts are respectively connected with the second energy absorption part and the third energy absorption part, and the two symmetrical concave triangular cell elements are connected through the lower horizontal force transmission connecting part; the vertical force transmission connecting part is used for being connected with another microcell; the third energy absorption part is connected with the lower horizontal connecting part, the included angle beta between the third energy absorption part and the lower horizontal connecting part is 140-180 degrees, and the microcells are sequentially arranged and combined in the X direction and the Y direction, so that an octagonal energy absorption area is formed between two adjacent groups of microcells.

2. The dual platform filling structure with dual protection according to claim 1, wherein the cove triangular cell further comprises a third energy absorbing member, a fourth energy absorbing member; the structure of the third energy absorbing piece and the structure of the fourth energy absorbing piece are the same as the structure of the first energy absorbing piece, the third energy absorbing piece and the fourth energy absorbing piece are respectively fixed on the other two surfaces of the connecting block, a 90-degree included angle is formed between the third energy absorbing piece and the first energy absorbing piece, a 90-degree included angle is formed between the fourth energy absorbing piece and the second energy absorbing piece, and the micro-cells are sequentially arranged and combined in the X direction, the Y direction and the Z direction to form the double-platform filling structure.

3. The dual-platform filling structure with dual protection according to claim 1, wherein the dual-platform filling structure is a 3D printed integrated structure, and the length a of the upper horizontal plane of the recessed triangular cell body is 4-8 mm; the wall thicknesses b of the first energy absorption part, the second energy absorption part and the third energy absorption part are the same and are all 1-2 mm.

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