CN108502031B - Automobile threshold with microcell filling layer - Google Patents
Automobile threshold with microcell filling layer Download PDFInfo
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- CN108502031B CN108502031B CN201810330663.8A CN201810330663A CN108502031B CN 108502031 B CN108502031 B CN 108502031B CN 201810330663 A CN201810330663 A CN 201810330663A CN 108502031 B CN108502031 B CN 108502031B
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- Prior art keywords
- energy
- vertical
- absorbing part
- transverse
- energy absorbing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D25/00—Superstructure or monocoque structure sub-units; Parts or details thereof not otherwise provided for
- B62D25/20—Floors or bottom sub-units
-
- 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
- B60R19/42—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects extending primarily along the sides of, or completely encircling, a vehicle
Abstract
The invention belongs to the field of automobile parts, and particularly relates to an automobile threshold with a special microcell filling layer, which comprises the following components in parts by weight: the automobile door sill plate comprises automobile door sill plates arranged at the inner side and the outer side, and a microcell filling layer arranged between the automobile door sill plates at the inner side and the outer side, wherein the microcell filling layer is a three-dimensional structure formed by sequentially arranging and combining a plurality of unit cells in the X direction, the Y direction and the Z direction; the unit cell is formed by combining four energy absorbing parts, two adjacent energy absorbing parts are arranged vertically, and the top ends and the bottoms of the four energy absorbing parts are connected through a square connecting block to form a whole; the energy absorbing piece comprises a first transverse energy absorbing part, a second transverse energy absorbing part symmetrically arranged with the first transverse energy absorbing part, a first vertical energy absorbing part and a second vertical energy absorbing part symmetrically arranged with the first vertical energy absorbing part; the invention has the advantages that: the automobile threshold has a simple structure and a good energy absorption effect, is suitable for various automobile types, reduces the side collision peak value, and can better protect the life safety of a driver.
Description
Technical Field
The invention belongs to the field of automobile parts, and particularly relates to an automobile threshold with a microcell filling layer.
Background
With the continuous increase of the automobile holding capacity, the occurrence frequency of automobile traffic accidents is gradually increased, and the active and passive safety of automobiles becomes more and more important. In the us crash investigation statistics, the probability of a side crash is 7%, and in the japanese crash investigation statistics, the probability of a side crash is 12.7%. Because the side impact is a position relatively close to the driver, which has great threat to the life safety of the driver, it is important to enhance the safety of the side impact.
Automobile doorsills are the main energy-absorbing member for side impact and are a hotspot for many researchers to study side impact. At present, the general measures for improving the side collision safety are to improve the thickness of a plate and increase reinforcing ribs, so that the automobile becomes heavier and the requirement of the trend of light weight of the automobile is not met; in addition, although the reinforcing rib structure can increase the strength of the threshold, the reinforcing rib structure is not beneficial to deformation of the threshold to absorb collision energy, and when the external impact energy is too large, the reinforcing rib structure pushes the threshold plate to impact a cab, so that a driver is injured.
In recent years, cellular materials are continuously developed and applied, the excellent energy absorption performance and the light weight performance of the cellular materials become research hotspots of various industries, and positive effects can be produced if the cellular materials are reasonably applied to automobile doorsils.
Disclosure of Invention
The invention aims to provide an automobile threshold with a microcell filling layer, and aims to solve the technical problems of poor energy absorption effect, heavy weight and high production cost in the side collision of the conventional automobile threshold.
In order to realize the purpose, the invention is realized by adopting the following technical scheme:
the utility model provides an automobile threshold with little cellular filling layer, is including setting up the automobile threshold board in inside and outside both sides, sets up the little cellular filling layer between the automobile threshold board of inside and outside both sides, and the improvement of doing is:
the microcell filling layer is of a three-dimensional structure formed by sequentially arranging and combining a plurality of unit cells in the X direction, the Y direction and the Z direction; the unit cell is formed by combining four energy absorbing pieces, two adjacent energy absorbing pieces are arranged vertically, and the top ends and the bottoms of the four energy absorbing pieces are connected through a square connecting block to form a whole; the energy absorbing piece comprises a first transverse energy absorbing part, a second transverse energy absorbing part symmetrically arranged with the first transverse energy absorbing part, a first vertical energy absorbing part and a second vertical energy absorbing part symmetrically arranged with the first vertical energy absorbing part; the first transverse energy absorption part is obliquely arranged on one side surface of the connecting block at the top end, and the included angle alpha 1 between the first transverse energy absorption part and the horizontal plane of the connecting block is 140-170 degrees; the other end of the first transverse energy-absorbing part is connected with the first vertical energy-absorbing part, and an included angle beta 1 between the first transverse energy-absorbing part and the first vertical energy-absorbing part is 45-60 degrees; a horizontal connecting surface and a vertical connecting surface are processed on the outer surface of the connecting end of the first transverse energy absorbing part and the first vertical energy absorbing part; the horizontal connecting surface is used for connecting with another unit cell in the Y direction; the vertical connecting surface is used for connecting with another unit cell in the X direction or the Z direction; the first vertical energy absorption part is connected with the second vertical energy absorption part through a vertical buffer part, and the stress acting on the energy absorption piece is decomposed through the vertical buffer part and acts on each energy absorption part respectively; the other end of the second vertical energy-absorbing part is connected with the second transverse energy-absorbing part, an included angle beta 2 between the second vertical energy-absorbing part and the second transverse energy-absorbing part is 45-60 degrees, and a horizontal connecting surface and a vertical connecting surface are also processed on the outer surface of the connecting end of the second vertical energy-absorbing part and the second transverse energy-absorbing part; the other end of the second transverse energy-absorbing part is obliquely arranged on one side surface of the connecting block at the bottom, and the included angle alpha 2 between the second transverse energy-absorbing part and the horizontal plane of the connecting block is 140-170 degrees.
Preferably, the microcell filling layer is of a 3D printed integrated structure, the wall thicknesses of the first transverse energy absorbing part, the second transverse energy absorbing part, the first vertical energy absorbing part and the second vertical energy absorbing part of each energy absorbing piece on the unit cells forming the microcell filling layer are the same, the wall thickness is λ × L, λ is greater than or equal to 0.4 and less than or equal to 0.6, and L is the vertical length of a single energy absorbing piece, namely the distance between the horizontal connecting surface in the first transverse energy absorbing part and the horizontal connecting surface in the second transverse energy absorbing part; the size of the vertical buffer part is equal to the length, width and height of the connecting block, and the transverse total length C of the two symmetrically arranged energy absorbing pieces is equal to the vertical length L of a single energy absorbing piece.
The invention has the advantages and beneficial effects that:
(1) the automobile threshold provided by the invention has the advantages of simple structure, good energy absorption effect and strong adaptability, and can adapt to a plurality of automobile types; meanwhile, by utilizing the zero Poisson ratio effect of the unit cells, the material is not expanded all around in the collision process, but is gathered and compressed along the impact direction, so that the energy is fully absorbed, and the energy is absorbed more greatly.
(2) The automobile threshold provided by the invention utilizes the pores of the multi-cell structure to increase the deformation space, and simultaneously utilizes the zero Poisson's ratio effect of the structure to absorb more energy. By adopting the automobile threshold, the collision resistance is enhanced and the weight is lighter under the condition of meeting the requirement of strength; meanwhile, the microcell filling layer inside the automobile threshold can be directly printed in a 3D printing mode, so that the production cost is greatly reduced, and the production efficiency is improved.
(3) The invention fills the unit cells with concave four sides as the minimum units, so that the initial peak value of collision is lower and is close to the stress area of the platform, which is beneficial to protecting the life safety of drivers, and meanwhile, the stress platform area is long and stable, so that the energy absorption process is more stable.
(4) On the basis of the traditional doorsill, 4 microcell filling layers are filled inside the automobile doorsill, the base material of the automobile doorsill is aluminum, and when the thickness of the filling layer is 48mm, compared with the traditional automobile doorsill, the weight of the automobile doorsill is reduced by 10%; the bending rigidity is improved by 15 percent; the initial peak value of collision is reduced by 30%, and the energy absorption is increased by 20%.
(5) According to the invention, the microcell filling layer is filled in the automobile threshold, and because a large number of pores exist in the automobile threshold, a sound forbidden band within a certain frequency can be generated for noise transmitted from the outside of an automobile, so that the noise reduction effect is realized according to the band gap principle, and the driving comfort is improved.
Drawings
Fig. 1 is a partially enlarged view of an automobile rocker structure.
Fig. 2 is a schematic structural diagram of a unit cell.
FIG. 3 is a schematic diagram of the arrangement of two unit cells.
Fig. 4 is a schematic diagram of an arrangement of four unit cells.
Fig. 5 is a schematic diagram of an arrangement of a plurality of unit cells.
FIG. 6 is a schematic view of a structure in which two energy absorbing members are symmetrically connected.
FIG. 7 is a two-dimensional in-plane deformation process diagram of the filler layer during a collision impact.
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, an automobile doorsill 1 having a microcell filling layer according to the present invention includes: the sandwich structure comprises automobile threshold plates 3 arranged on the inner side and the outer side and a microcell filling layer 2 arranged between the automobile threshold plates on the inner side and the outer side, wherein the microcell filling layer 2 and the automobile threshold plates 3 are connected in a bonding mode to form a sandwich structure.
Referring to fig. 2 to 5, the microcell-filled layer 2 has a three-dimensional structure in which a plurality of unit cells are sequentially arranged and combined in the X, Y, and Z directions; the unit cell is formed by combining four energy absorbing pieces 4, two adjacent energy absorbing pieces 4 are arranged vertically, and the top ends and the bottom ends of the four energy absorbing pieces 4 are connected through a square connecting block 11 to form a whole; the energy absorbing part 4 comprises a first transverse energy absorbing part 41, a second transverse energy absorbing part 42 arranged symmetrically to the first transverse energy absorbing part, a first vertical energy absorbing part 43 and a second vertical energy absorbing part 44 arranged symmetrically to the first vertical energy absorbing part; the first transverse energy-absorbing part 41 is obliquely arranged on one side surface of the connecting block 11 at the top end, the included angle alpha 1 between the first transverse energy-absorbing part 41 and the horizontal plane of the connecting block 11 is 140-170 degrees, the other end of the first transverse energy-absorbing part 41 is connected with the first vertical energy-absorbing part 43, the included angle beta 1 between the first transverse energy-absorbing part 41 and the first vertical energy-absorbing part 43 is 45-60 degrees, and a horizontal connecting surface 411 and a vertical connecting surface 431 are processed on the outer surface of the connecting end of the first transverse energy-absorbing part 41 and the first vertical energy-absorbing part 43; the horizontal connecting surface 411 is used for connecting with another unit cell in the Y direction; the vertical connecting surface 431 is used for connecting with another unit cell in the X direction or the Z direction; the first vertical energy absorption part 43 is connected with the second vertical energy absorption part 44 through a vertical buffer part 45, and the stress acting on the energy absorption piece is decomposed through the vertical buffer part 45 and acts on each energy absorption part respectively; the other end of the second vertical energy-absorbing part 44 is connected with the second transverse energy-absorbing part 42, the included angle beta 2 between the second vertical energy-absorbing part 44 and the second transverse energy-absorbing part 42 is 45-60 degrees, and a horizontal connecting surface and a vertical connecting surface are also processed on the outer surface of the connecting end of the second vertical energy-absorbing part 44 and the second transverse energy-absorbing part 42; the other end of the second transverse energy-absorbing part 42 is obliquely arranged on one side surface of the connecting block 11 at the bottom, and the included angle alpha 2 between the second transverse energy-absorbing part 42 and the horizontal plane of the connecting block 11 is 140-170 degrees.
The microcell filling layer 2 is of an integrated structure printed in 3D, the wall thicknesses of a first transverse energy absorbing part 41, a second transverse energy absorbing part 42, a first vertical energy absorbing part 43 and a second vertical energy absorbing part 44 of each energy absorbing piece 4 on the unit cells forming the microcell filling layer 2 are the same, the wall thickness is λ × L, λ is greater than or equal to 0.4 and less than or equal to 0.6, and L is the vertical length of a single energy absorbing piece (namely the distance between a horizontal connecting surface in the first transverse energy absorbing part 41 and a horizontal connecting surface in the second transverse energy absorbing part 42); the length of the vertical buffer part is equal to the length, width and height of the connecting block; the total transverse length C of the two symmetrically arranged energy absorbing members (i.e. the distance between the vertical connecting surface on one energy absorbing member and the vertical connecting surface on the other energy absorbing member) is equal to the vertical length L of a single energy absorbing member.
The unit cell is designed into the structure, so that the unit cell can be stably deformed under stress and has a good force transmission effect; when the parameters exceed the set range, the unit cells are stressed and deformed unstably, and the force transmission effect is poor.
According to the automobile doorsill, the thicker the middle microcell filling layer 2 is, the more the number of layers is accommodated, the better the energy absorption effect is, but the more the number of layers is, the more the structure of the doorsill is heavy, and the lightweight and safety game is realized. In view of the internal space of the conventional car doorsill, the number of the unit cells in the Y direction in the microcell filling layer 2 is generally controlled to be 4-15, preferably 6-10.
According to the automobile threshold, the microcell filling layer 2 is made of aluminum or other metal materials, and the extensibility is excellent when the automobile threshold is deformed greatly.
Referring to fig. 7, according to the two-dimensional in-plane deformation process of the microcell filling layer 2 during the collision impact, it can be seen that the cell walls (the first transverse energy absorbing portion 41, the second transverse energy absorbing portion 42, the first vertical energy absorbing portion 43, and the second vertical energy absorbing portion 44) of the unit cells gradually fill the pore portions, which are so-called energy absorbing spaces, to provide a space condition for the deformation of the unit cell structure, thereby absorbing more energy; in addition, the structure has a zero Poisson ratio phenomenon, in the collision and impact process, the material does not extend to the periphery and deforms only in the compression direction, the material of each unit cell gathers towards the center of each unit cell, and the later stage of the unit cell is harder to press, so that the rigidity condition of the automobile doorsill is ensured, the unit cell is unlikely to be damaged by collision. In the process of impact collision by adopting the unit cell structure, each energy absorption part is concave, so that the deformation is relatively easy to occur, the initial peak value is greatly reduced, and meanwhile, due to the zero Poisson's ratio effect caused by the concave, the energy absorption process is more stable along with a long and stable stress platform area in the impact process, and the energy absorption is also greatly increased.
The working principle is as follows:
when the automobile is laterally collided, the microcell filling layer 2 in the doorsill is compressed, all energy absorption parts on the unit cells gradually fill the surrounding pore parts, and the collision energy is absorbed and lost by deformation; meanwhile, due to the zero Poisson ratio effect of the unit cell structure, the material does not extend to the periphery and only deforms in the compression direction, the material of each unit cell gathers towards the center of each unit cell, the harder the material is pressed later, a stable and long platform area can be formed in the process, the stress value in the area basically keeps unchanged to form a platform, the longer the platform area is, the larger the enclosed area is, the more the energy is absorbed, and the life safety of a driver is effectively protected; the smaller the plateau region fluctuation, the more stable the energy absorption process. In addition, through the reasonable design of the geometric dimensions (cell wall thickness, width, concave angle and the like) of the unit cells, the platform area in the stress-strain curve is close to a limit value, namely, on the premise of ensuring the life safety of a driver, the energy is absorbed as much as possible, the platform area is passed and then enters a compact area, the material is compacted more and harder more, the rigidity of the threshold is ensured, the damage degree to the threshold is reduced, and at the moment, the collision energy is basically absorbed and consumed.
And (3) performance detection:
on the basis of the structure of the traditional automobile threshold, 4 microcell filling layers 2 are added, the base material is aluminum, the thickness of the filling layer is 48mm, a side impact simulation test is carried out according to enterprise standards, and the weight, the bending rigidity, the initial peak value of impact and the energy absorption are detected.
And (3) detection results: compared with the traditional automobile threshold, the weight is reduced by 10%; the bending rigidity is improved by 15 percent; the initial peak value of collision is reduced by 30%, and the energy absorption is increased by 20%.
Claims (2)
1. The utility model provides an automobile threshold with little cellular filling layer, is including setting up the automobile threshold board of inside and outside both sides, sets up little cellular filling layer between the automobile threshold board of inside and outside both sides, its characterized in that:
the microcell filling layer is of a three-dimensional structure formed by sequentially arranging and combining a plurality of unit cells in the X direction, the Y direction and the Z direction; the unit cell is formed by combining four energy absorbing pieces, two adjacent energy absorbing pieces are arranged vertically, and the top ends and the bottoms of the four energy absorbing pieces are connected through a square connecting block to form a whole; the energy absorbing piece comprises a first transverse energy absorbing part, a second transverse energy absorbing part symmetrically arranged with the first transverse energy absorbing part, a first vertical energy absorbing part and a second vertical energy absorbing part symmetrically arranged with the first vertical energy absorbing part; the first transverse energy absorption part is obliquely arranged on one side surface of the connecting block at the top end, and the included angle alpha 1 between the first transverse energy absorption part and the horizontal plane of the connecting block is 140-170 degrees; one end of the first transverse energy-absorbing part is connected with the first vertical energy-absorbing part, and an included angle beta 1 between the first transverse energy-absorbing part and the first vertical energy-absorbing part is 45-60 degrees; a horizontal connecting surface and a vertical connecting surface are processed on the outer surface of the connecting end of the first transverse energy absorbing part and the first vertical energy absorbing part; the horizontal connecting surface is used for connecting with another unit cell in the Y direction; the vertical connecting surface is used for connecting with another unit cell in the X direction or the Z direction; the first vertical energy absorption part is connected with the second vertical energy absorption part through a vertical buffer part, and the stress acting on the energy absorption piece is decomposed through the vertical buffer part and acts on each energy absorption part respectively; one end of the second vertical energy-absorbing part is connected with the second transverse energy-absorbing part, an included angle beta 2 between the second vertical energy-absorbing part and the second transverse energy-absorbing part is 45-60 degrees, and a horizontal connecting surface and a vertical connecting surface are also processed on the outer surface of the connecting end of the second vertical energy-absorbing part and the second transverse energy-absorbing part; one end of the second transverse energy-absorbing part is obliquely arranged on one side surface of the connecting block at the bottom, and the included angle alpha 2 between the second transverse energy-absorbing part and the horizontal plane of the connecting block is 140-170 degrees.
2. An automobile threshold having a microcell-filled layer according to claim 1, wherein: the microcell filling layer is of a 3D printed integrated structure, the wall thicknesses of a first transverse energy absorption part, a second transverse energy absorption part, a first vertical energy absorption part and a second vertical energy absorption part of each energy absorption piece on unit cells forming the microcell filling layer are the same, the wall thickness is lambda multiplied by L, lambda is more than or equal to 0.4 and less than or equal to 0.6, and L is the vertical length of a single energy absorption piece, namely the distance between a horizontal connection surface in the first transverse energy absorption part and a horizontal connection surface in the second transverse energy absorption part; the size of the vertical buffer part is equal to the length, width and height of the connecting block, and the transverse total length C of the two symmetrically arranged energy absorbing pieces is equal to the vertical length L of a single energy absorbing piece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810330663.8A CN108502031B (en) | 2018-04-13 | 2018-04-13 | Automobile threshold with microcell filling layer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810330663.8A CN108502031B (en) | 2018-04-13 | 2018-04-13 | Automobile threshold with microcell filling layer |
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| Publication Number | Publication Date |
|---|---|
| CN108502031A CN108502031A (en) | 2018-09-07 |
| CN108502031B true CN108502031B (en) | 2020-08-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810330663.8A Expired - Fee Related CN108502031B (en) | 2018-04-13 | 2018-04-13 | Automobile threshold with microcell filling layer |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110649192B (en) * | 2019-08-28 | 2021-11-05 | 南京航空航天大学 | Hydrogen-oxygen fuel cell box based on zero Poisson ratio material |
| CN110660937B (en) * | 2019-08-28 | 2021-11-05 | 南京航空航天大学 | Electric automobile battery box based on thickness-variable gradient zero Poisson ratio structure |
| CN110660938B (en) * | 2019-08-28 | 2021-11-05 | 南京航空航天大学 | Electric automobile battery box based on zero poisson's ratio material |
| CN110645298B (en) * | 2019-09-17 | 2020-07-03 | 吉林大学 | Double-platform filling structure with double protection |
| 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 |
| CN113882210B (en) * | 2021-08-19 | 2022-11-08 | 于洪岗 | Asphalt pavement structure with three-dimensional space honeycomb structure with zero Poisson effect |
| CN113978403A (en) * | 2021-11-17 | 2022-01-28 | 一汽解放汽车有限公司 | Collision protection assembly and commercial vehicle |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2161403C (en) * | 1995-10-25 | 2009-08-18 | Pat Berube | Go-kart bumper system |
| DE102011101009A1 (en) * | 2011-05-10 | 2012-11-15 | Daimler Ag | Device for protecting vehicle i.e. small car, against e.g. side collision, has crash element that is coupled with driving apparatus and extendable before or during collision of vehicle based on current speed of vehicle |
| US9868361B2 (en) * | 2014-12-11 | 2018-01-16 | Ford Global Technologies, Llc | Battery impact absorbing system |
| CN106740620B (en) * | 2016-12-27 | 2023-03-28 | 南京航空航天大学 | Automobile energy absorption box filled based on negative Poisson ratio structure and multi-objective optimization method thereof |
| CN107235024B (en) * | 2017-04-28 | 2023-03-28 | 南京航空航天大学 | Variable-thickness gradient negative poisson ratio automobile buffering energy-absorbing structure and optimization method thereof |
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