CN110645298B - Double-platform filling structure with double protection - Google Patents

Double-platform filling structure with double protection Download PDF

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Publication number
CN110645298B
CN110645298B CN201910876625.7A CN201910876625A CN110645298B CN 110645298 B CN110645298 B CN 110645298B CN 201910876625 A CN201910876625 A CN 201910876625A CN 110645298 B CN110645298 B CN 110645298B
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China
Prior art keywords
energy absorbing
energy
absorbing part
double
piece
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Expired - Fee Related
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CN201910876625.7A
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Chinese (zh)
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CN110645298A (en
Inventor
马芳武
梁鸿宇
王强
马文婷
蒲永锋
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Jilin University
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Jilin University
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Publication of CN110645298A publication Critical patent/CN110645298A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F7/00—Vibration-dampers; Shock-absorbers
    • F16F7/12—Vibration-dampers; Shock-absorbers using plastic deformation of members
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R19/00—Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
    • B60R19/02—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
    • B60R19/24—Arrangements for mounting bumpers on vehicles
    • B60R19/26—Arrangements for mounting bumpers on vehicles comprising yieldable mounting means
    • B60R19/34—Arrangements for mounting bumpers on vehicles comprising yieldable mounting means destroyed upon impact, e.g. one-shot type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/34—Protecting non-occupants of a vehicle, e.g. pedestrians
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/34—Protecting non-occupants of a vehicle, e.g. pedestrians
    • B60R2021/343—Protecting non-occupants of a vehicle, e.g. pedestrians using deformable body panel, bodywork or components
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F2224/00—Materials; Material properties
    • F16F2224/02—Materials; Material properties solids
    • F16F2224/0208—Alloys
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F2226/00—Manufacturing; Treatments
    • F16F2226/04—Assembly or fixing methods; methods to form or fashion parts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F2230/00—Purpose; Design features
    • F16F2230/02—Surface features, e.g. notches or protuberances

Abstract

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.

Description

Double-platform filling structure with double protection
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:
the double-platform filling structure with double protection comprises at least four micro cells, and is improved in that the micro cells are formed by combining two symmetrical inward concave triangular cell bodies, each inward concave triangular cell body comprises a first energy absorbing part and a second energy absorbing part, the first energy absorbing part and the second energy absorbing part are identical in structure, the top ends and the bottom of the first energy absorbing part and the bottom of the second energy absorbing part are connected through a connecting block to form a whole, each 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, an included angle α between the first energy absorbing part and the second energy absorbing part is 135-170 degrees, the second energy absorbing part is connected with the force transmission part, the force transmission part is connected with the third energy absorbing part, the force transmission part comprises two horizontal connecting parts and a vertical connecting part, the two horizontal connecting parts are respectively connected with the second energy absorbing part and the third energy absorbing part, the vertical force transmission part is connected with the upper horizontal connecting part β of the corresponding micro cells, and the vertical force transmission part, the upper horizontal connecting part is connected with the vertical force transmission part, and the vertical force transmission part of the micro cells, and the two groups of the micro cells are connected with the vertical force absorbing part, and the vertical force transmission part, and the upper triangular cell bodies, and the vertical force transmission part are connected with the upper triangular cell assembly, and.
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, 2 and 5, the double-platform filling structure with double protection comprises at least four micro cells, each micro cell is formed by combining two symmetrical inward concave triangular cell bodies 1, each inward concave triangular cell body comprises a first energy absorbing part 11 and a second energy absorbing part 12, the first energy absorbing part 11 and the second energy absorbing part 12 are identical in structure, the top ends and the bottoms of the first energy absorbing part and the second energy absorbing part are connected through a connecting block 15 to form a whole, each first energy absorbing part comprises an upper horizontal connecting part 111, a first energy absorbing part 112, a second energy absorbing part 113, a force transmission part 114, a third energy absorbing part 115 and a lower horizontal connecting part 116, the upper horizontal connecting part 111 is connected with the first energy absorbing part 112, the first energy absorbing part 112 is connected with the second energy absorbing part 113, an included angle α between the first energy absorbing part and the second energy absorbing part is 135-shaped charge 170 degrees, the second energy absorbing part 113 is connected with the first energy absorbing part 114, the first energy absorbing part 112 is connected with the second energy absorbing part 113, the first energy absorbing part and the second energy absorbing part α are connected with the second energy absorbing part, the vertical energy absorbing part 1142, the vertical force transmission part is connected with the two groups of the upper horizontal connecting parts 1142, the vertical force transmission parts are connected with the two groups of the upper horizontal connecting parts 1142, the two groups of the horizontal connecting parts, the vertical force transmission parts are connected with the vertical force transmission parts 1142, the two groups of the horizontal connection parts, the horizontal connection parts are connected with the vertical force transmission parts, the two groups of the horizontal connection parts, the two groups of the horizontal.
Referring to fig. 3 and 4, the inward-concave triangular cell element further includes a third energy absorbing member 13 and a fourth energy absorbing member 14; the structures of the third energy-absorbing piece 13 and the fourth energy-absorbing piece 14 are the same as those 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 15, 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.
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 energy absorbing part 112, the wall thickness b of the second energy absorbing part 113 and the wall thickness b of the third energy absorbing part 115 are the same and are all 1-2 mm.
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.

Claims (3)

1. A double-platform filling structure with double protection comprises at least four micro cells and is characterized in that the micro cells are formed by combining two symmetrical inward concave triangular cell bodies, each inward concave triangular cell body comprises a first energy absorbing part and a second energy absorbing part, the first energy absorbing part and the second energy absorbing part are identical in structure, an included angle between the first energy absorbing part and the second energy absorbing part is 180 degrees, the top ends and the bottoms of the first energy absorbing part and the second energy absorbing part are connected through a connecting block to form a whole, each 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, α degrees between the first energy absorbing part and the second energy absorbing part are 135, the second energy absorbing part is connected with the force transmission part, the second energy absorbing part is connected with the third energy absorbing part, the first energy absorbing part is connected with the second energy absorbing part, the first energy absorbing part and the second energy absorbing part are connected with the force transmission part, the vertical energy absorbing part is connected with the third energy absorbing part, the force transmission part, the vertical energy absorbing part is connected with the vertical energy absorbing part, the vertical energy absorbing part is connected with the third energy absorbing part, the horizontal connecting part β, the horizontal connecting part, the vertical force transmission part is connected with the vertical force transmission part, the vertical force transmission part is connected with the.
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.
CN201910876625.7A 2019-09-17 2019-09-17 Double-platform filling structure with double protection Expired - Fee Related CN110645298B (en)

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CN111457042B (en) * 2020-04-10 2021-08-27 中车青岛四方机车车辆股份有限公司 Vibration isolation equipment and railway vehicle applying same
CN112248956B (en) * 2020-10-21 2022-01-04 吉林大学 Multi-working-condition-based mixed gradient cage type energy absorption structure and processing method thereof
CN112428949B (en) * 2020-12-05 2022-05-13 吉林大学 Recoverable car energy-absorbing box that warp based on vibration material disk
CN113757289B (en) * 2021-09-06 2022-08-26 天津大学 Foldable and expandable porous bearing structure based on rigid folded paper
CN113978403A (en) * 2021-11-17 2022-01-28 一汽解放汽车有限公司 Collision protection assembly and commercial vehicle

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