Double-platform filling structure with double protection
阅读说明：本技术 一种具有双重保护的双平台填充结构 (Double-platform filling structure with double protection ) 是由 马芳武 梁鸿宇 王强 马文婷 蒲永锋 于 2019-09-17 设计创作，主要内容包括：本发明公开了一种具有双重保护的双平台填充结构,包括至少四个微元胞,所述微元胞由两个对称的内凹三角胞元体组合构成；所述内凹三角胞元体包括结构相同的第一吸能件、第二吸能件；所述第一吸能件、第二吸能件的顶端和底部均通过一个连接块连接；第一吸能件包括上水平连接部、第一吸能部、第二吸能部、传力部、第三吸能部、下水平连接部；所述微元胞在X向、Y向上依次排列组合,相邻两组微元胞之间形成八边形吸能区,该填充结构利用八边形吸能区即可实现对人与汽车的双向保护功能。(The invention discloses a double-platform filling structure with double protection, which comprises at least four microcells, wherein each microcell is formed by combining two symmetrical inwards concave triangular cell bodies; the concave triangular cell body comprises a first energy absorbing piece and a second energy absorbing piece which have the same structure; the top ends and the bottoms of the first energy-absorbing piece and the second energy-absorbing piece are connected through a connecting block; 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 micro-cells are sequentially arranged and combined in the X direction and the Y direction, an octagonal energy absorption area is formed between every two adjacent groups of micro-cells, and the filling structure can realize the bidirectional protection function on people and automobiles by utilizing the octagonal energy absorption area.)
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.
Technical Field
The invention belongs to the field of automobile parts, and particularly relates to a double-platform filling structure with double protection.
Background
The anti-collision beam, the energy absorption box and the front longitudinal beam form a main energy absorption part at the front end of the automobile; among them, the crash box plays a crucial role in low-speed collision. In recent years, many patents and academic researches have appeared on the performance improvement of the crash boxes, and the performance improvement 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 light energy-absorbing material into the energy-absorbing box. Chinese patent CN209079843U discloses a novel energy absorption box with multiple sections, which realizes the stability of the energy absorption process through the change of the sections. Chinese patent CN109532730A discloses a novel automobile energy absorption box device with special filling inside, which utilizes a hexagonal thin-wall tube and an internal filling structure to absorb more collision energy, and overcomes the problems of high initial peak value, unstable energy absorption, non-continuity, lower efficiency and the like of the traditional energy absorption box; chinese patent CN110015255A discloses a "energy absorption box with a star-shaped cell structure", which uses the deformation of star-shaped cell units to absorb more collision energy. Although the above patents all utilize the filling structure to improve the energy absorption performance of the energy absorption box from different angles, the above patents all belong to unidirectional protection, i.e. the damage to the crashed vehicle is buffered by absorbing more energy. However, due to the diversity of the vehicle collisions, including the collision between vehicles, the collision between people and vehicles, and the collision between non-motor vehicles and vehicles, when the collision is in the form of the collision between people or cyclists and vehicles, which requires bidirectional protection, the crash boxes of the existing stuffing structures cannot meet the requirements, because not only the damage degree of the vehicles is reduced, but also the safety of the people or the bicycles ridden by the people is required to be protected.
Disclosure of Invention
The invention aims to provide a double-platform filling structure with double protection, and aims to solve the technical problem that the filling structure in the conventional energy absorption box is in one-way protection, and when the collision form is that a person or a rider needs to be protected from the automobile in two directions, the damage degree of the automobile cannot be reduced, and the safety of the person is protected.
In order to realize the purpose, the invention is realized by adopting the following technical scheme:
a dual-protection dual-platform filling structure comprises at least four microcells, and the improvement is as follows: 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.
Preferably, the inward concave triangular cell element further comprises a third energy-absorbing piece and a fourth energy-absorbing piece; 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.
Preferably, the double-platform filling structure is an integrated structure for 3D printing, and the length a of the upper horizontal plane of the inward concave 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.
The double-platform filling structure can be obtained through a two-dimensional array of the microcells, namely, the microcells are sequentially arranged in the X direction and the Y direction, the Z direction is controlled by controlling the thickness of the microcells, then a group of octagonal structures formed in the middles of the microcells are utilized to realize double protection effects, and the filling structure can be filled on an anti-collision beam of an automobile, so that double protection can be realized; when the inward-concave triangular cell bodies on the micro cells further comprise a third energy absorbing part and a fourth energy absorbing part, a double-platform filling structure can be obtained through a micro cell three-dimensional array, namely the micro cells are sequentially arranged in the X direction, the Y direction and the Z direction, so that two groups of mutually perpendicular octagonal structures can be formed in the whole filling structure, the energy absorbing effect is further improved, the double-platform filling structure obtained by adopting the three-dimensional array is suitable for parts with regular filling structures, for example, an energy absorbing box of an automobile (the outer skin of the energy absorbing box can be a hollow cylindrical column, a hollow quadrilateral, a hexagon and other polygonal columns), and the double-platform filling structure can be directly filled in the outer skin of the energy absorbing box during use.
In a further preferred embodiment of the present invention, the material of the microcells is aluminum or other metal material.
Compared with the prior art, the invention has the advantages and beneficial effects that:
(1) the double-platform filling structure provided by the invention improves the connection relation of the existing inward-concave triangular cell body structure, and the result is unexpected discovery that the inward-concave triangular cell bodies which are symmetrically designed are adopted as the micro cells, the octagonal energy absorption area can be formed between the adjacent micro cells by sequentially arranging and combining the micro cells in the X direction, the Y direction or the X direction, the Y direction and the Z direction, and in the subsequent deformation, the octagonal energy absorption area is transited to the quadrilateral energy absorption area, so that the double-platform switching is formed, and the bidirectional protection function for people and automobiles is realized.
(2) When the double-platform filling structure provided by the invention is impacted by collision, the whole structure presents a deformation mode of zero Poisson ratio effect in the deformation process, namely, the material only deforms along the axial impact direction, and the deformation is very small along the direction vertical to the impact direction; and there is a kind of "double platform" phenomenon in the energy-absorbing course of deforming, namely produce the first platform very fast at the beginning of impacting, produce the second platform subsequently, the second platform has improved certain height relative to the first platform, the first platform with lower counter force is used for playing and protecting people or bicycle that people ride, etc., because the lower lasting and stable counter force is very favorable to protecting people or bicycle that people ride, if fluctuate greatly or the platform value is higher, can make people receive the dynamic load of the great impact force or periodic frequency, thus cause the instantaneous injury, the second platform is used for protecting the car body.
(3) The double-platform filling structure provided by the invention is in a deformation mode of zero Poisson ratio effect, so that the double-platform filling structure can be used on the energy-absorbing box, can realize stable deformation of the whole energy-absorbing box, and prevents the material from transversely expanding and extruding the outer skin of the energy-absorbing box.
(4) The double-platform filling structure provided by the invention is simple in structure, can be manufactured by combining a 3D printing process, adopts a metal material with better toughness as a printing material, realizes the light weight of an automobile, and reduces the oil consumption of the automobile.
Drawings
Fig. 1 is a schematic diagram of the overall structure of the dual-platform filling structure arranged and combined in the X direction and the Y direction.
FIG. 2 is a front view of the dual-platform filling structure of the present invention arranged and assembled in X-direction and Y-direction.
FIG. 3 is a schematic diagram of the overall structure of the dual-platform filling structure of the present invention arranged and combined in the X-direction, the Y-direction, and the Z-direction.
FIG. 4 is a front view of the dual platform filling structure of the present invention arranged and assembled in X, Y and Z directions.
FIG. 5 is a front view of an invaginated trigonal cell.
Fig. 6 is a diagram illustrating a deformation process of the filling structure during a collision impact.
FIG. 7 is a graph of force versus displacement for a simulation run under medium and low speed crash conditions.
Detailed Description
In order to make the technical solutions and advantages thereof better understood by those skilled in the art, the present application is described in detail below with reference to the accompanying drawings, but the present application is not limited to the scope of the present invention.
Referring to fig. 1, fig. 2 and fig. 5, the dual-platform filling structure with dual protection provided by the present invention includes at least four microcells, each microcell is formed by combining two symmetrical inward-concave
Referring to fig. 3 and 4, the inward-concave triangular cell element further includes a third
Continuing to refer to fig. 5, the double-platform filling structure is an integrated structure for 3D printing, and the length a of the upper horizontal plane of the inward concave triangular cell element is 4-8 mm; the wall thickness b of the first
When the double-platform filling structure is filled on the energy absorption box, the number of filling layers is generally 4-6, and the sizes of C and L are determined by the overall size of the energy absorption box and the number of filling layers.
Referring to fig. 6 and 7, when the dual-platform filling structure provided by the invention is impacted by collision, the internal filling structure exhibits a deformation mode of zero poisson's ratio effect, that is, the material deforms only along the axial impact direction, and the deformation is very small along the direction perpendicular to the impact direction; in addition, by observing the force variation curve along with displacement in the impact process under the working condition of medium-low speed collision, the following can be observed: the inner structure is in the deformation energy-absorbing in-process, there is a "two platform" phenomenon, begin to produce first platform very fast impacting, the second platform has been produced afterwards, the second platform has improved certain height H for first platform, the first platform that the counter-force is lower is used for playing the bicycle etc. that the protection people or people ridden, lower continuation and stable counter-force is very favourable, if undulant great or platform value is higher, can make the people receive great impact force or periodic frequency's dynamic load, thereby cause injury in the twinkling of an eye. Meanwhile, the protection of the vehicle body is also considered, because the larger the area enclosed by the curve is, the more energy is absorbed, and the smaller the damage degree of the vehicle body is, therefore, the occurrence of the second platform mainly protects the vehicle body, and the higher platform value of the second platform is beneficial to the deformation of the structure to absorb more energy.
The working principle is as follows:
through the deformation process diagram, we can find that: in the impact process, the whole uniform deformation state is presented, firstly, the contraction of the left cell wall and the right cell wall is carried out layer by layer, so that the energy absorption area of the interlayer octagonal structure is changed into the energy absorption area of the quadrilateral structure, and then deformation belts are respectively formed at the impact end and the fixed end to carry out alternate deformation crushing; the first platform area is mainly caused by an interlayer octagonal deformation characteristic, and the second platform area is caused by an interlayer quadrilateral deformation characteristic, so that the long and stable double-platform phenomenon is realized.