CN106347463A - Bionic energy absorption box - Google Patents
Bionic energy absorption box Download PDFInfo
- Publication number
- CN106347463A CN106347463A CN201610903362.0A CN201610903362A CN106347463A CN 106347463 A CN106347463 A CN 106347463A CN 201610903362 A CN201610903362 A CN 201610903362A CN 106347463 A CN106347463 A CN 106347463A
- Authority
- CN
- China
- Prior art keywords
- absorption box
- connecting plate
- energy
- box body
- thin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D21/00—Understructures, i.e. chassis frame on which a vehicle body may be mounted
- B62D21/15—Understructures, i.e. chassis frame on which a vehicle body may be mounted having impact absorbing means, e.g. a frame designed to permanently or temporarily change shape or dimension upon impact with another body
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Vibration Dampers (AREA)
Abstract
The invention discloses a bionic energy absorption box. The bionic energy absorption box comprises a first connecting plate, a box body and a second connecting plate; the first connecting plate and the second connecting plate are respectively fixed to the two ends of the box body; the bionic energy absorption box is characterized in that the box body consists of grid walls of a polygonal grid unit and thin-walled columns which are arranged along the intersections of the grid walls; the thin-walled columns and the grid walls are waveforms with equal cross sections; a waveform deformation leading line is formed at the intersection of each grid wall and the corresponding thin-walled column. The energy absorption box disclosed by the invention is high in energy absorption capacity and stable in energy consumption; the speed of an automobile is effectively reduced after the automobile is collided, and the maximum safe speed of safety collision of the automobile is further improved; the bionic energy absorption box is particularly suitable for the field of design and manufacturing of automobile parts and similar structures with anti-collision requirements; the life safety of a main body and people can be effectively guaranteed.
Description
Technical field
The present invention relates to a kind of energy-absorption box for absorbing impact when colliding, more particularly, to a kind of vehicle energy absorption box.
Background technology
During collision scenario, particularly low speed collision when, for avoid front longitudinal deform, generally vehicle beam (insurance
Thick stick) energy-absorption box is installed and front longitudinal (automobile main frame) between.When collision occurs, contact is automobile front beam first, its
Secondary is energy-absorption box, is finally front longitudinal.Bumper and energy-absorption box not only act as protection passenger and outside pedestrains safety,
So that extent of injury is tried one's best outside the effect reducing, also function to make the effect of the damaged condition reduction of vehicle and other part, so exist
After vehicle collision occurs, its maintenance cost just can reduce.But the test result of the iihs of the U.S. shows, most of configuration of automobiles
Bumper is far from enough shock-absorbing capacities at present to reach the purpose of maintenance cost reduction.Therefore energy-absorption box is except having foot
Outside enough intensity, the rigidity crashworthiness stronger to meet automobile, also should have suitable buffering energy-absorbing ability, to be subtracted with this
The impulsive force producing during weak collision.When therefore colliding, determine that the critical component of its crashworthiness is bumper system for vehicles
Energy absorbing component and front longitudinal between, the energy that collision is produced all is absorbed by the good part of energy absorption characteristics, makes its of car body
Its structure avoids permanent deformation, thus protecting the vitals against damages such as automobile front longitudinal beam, electromotor, more ensures occupant
Injury-free.When collision, automobile reaches certain speed, energy-absorption box can not fully absorb kinetic energy during car crass, residual energy
Amount is then undertaken by longeron, and now the agent structure of automobile will be damaged, or even threatens the safety of occupant.
But inventor finds to yet suffer from problems with current technology: existing tradition energy-absorption box is only tetragon square
Shape or single cylinder, its deformation guide line is also broken line, thus the plastic deformation that difference makes full use of material is consumed energy.
Therefore there is the shortcomings of shock-absorbing capacity is not enough, energy-absorbing stroke is longer.The protector master when automobile occurs low speed collision can only be ensured
Body structure and the safety of internal staff.When automobile occurs high speed collision, larger secondary collision injury can be produced, now
The effect that energy-absorption box is played is very limited.
Content of the invention
The technical problem to be solved is the deficiency existing for above-mentioned prior art, and provides a kind of energy-absorbing
The big and fast bionical energy-absorption box that consumes energy.
For solving above-mentioned technical problem, the technical solution used in the present invention is:
A kind of bionical energy-absorption box, the first connecting plate, box body and the second connecting plate, the first connecting plate and the second connecting plate divide
Be not fixed on the two ends of box body it is characterised in that: described box body is by the grid wall of polygon grill unit and along cell walls
The thin-walled column composition of intersection's setting, described thin-walled column and grid wall are prismatic waveform, in grid wall and thin-walled column
Intersection forms the deformation guide line of waveform.
Described waveform is the composite wave of sine wave, cosine wave or sine wave and cosine wave, wherein when waveform is sine wave y
=asinx or cosine wave y=aconx or composite wave y=a (conx+sinx), its amplitude a is determined by following formula, and wherein p is no
The maximum compression strength of box body during sine wave, f is required maximum compression strength when using, and x is box body along short transverse
Variable, dx is the differential to x:
Only sine wave when:
Only cosine wave when:
When sine wave and cosine wave composite wave:
Described be provided with sine wave or cosine wave deformation guide line box body can be by formed by integrally casting molding or machining mode
Formed.
Described polygon grill unit is the polygon grids such as triangle, tetragon or hexagon.
The material selection steel of energy-absorption box, aluminium alloy or fibrous composite.
Described grid wall two ends are connected with the first connecting plate and the second connecting plate respectively with thin-walled column two ends.
Box body quantity between the first connecting plate and the second connecting plate is equal to or more than one.
In energy-absorption box of the present invention, thin-walled pillar-cell structure has outstanding deformation energy dissipation capacity.Compared to existing energy-absorbing
Box, its deformation energy dissipation capacity is 5～7 times of existing energy-absorption box；Compared to being not provided with sine wave (or cosine wave and combinations thereof ripple
Shape) deformation guide line column structure, the present invention not only has the spy that power consumption is stable, make full use of material plasticity deformability
Point, and can effectively reduce the impact force peak value of car crass moment, it is reduced as far as the huge punching of impact moment generation
Power of hitting threatens to the safety of occupant.Therefore this energy-absorption box can quickly absorb collision energy, and power consumption is stable, effectively drops
Low collision rift speed, improves maximum safe speed during automobile safety collision further, and emphasis is applied to the Design of Auto Parts
Manufacture field or the similar structure having anticollision requirement, can effective guarantee agent structure and people life security.And according to difference
Vehicle and the requirement of collision peak value, can be by changing the amplitude of sine wave (or cosine wave and combinations thereof waveform) deformation guide line
Change the peak value of energy-absorption box impact force, the size of impact force peak value also determines the energy dissipation capacity of total to a certain extent:
Can not be excessive, occupant can be threatened safely；Nor too small, energy dissipation capacity can be led to not enough.When waveform is sine
Ripple y=asinx or cosine wave y=aconx or composite wave y=a (conx+sinx), its amplitude a is determined by following formula, wherein p is
No sine wave when box body maximum compression strength, f is required maximum compression strength when using, and x is the change along short transverse
Amount, dx is that x is carried out with differential:
Only sine wave when:
Only cosine wave when:
When sine wave and cosine wave composite wave:
Above formula is definite integral formula.
Brief description
Fig. 1 is the present invention bionical energy-absorption box schematic diagram.
Fig. 2 is the present invention bionical energy-absorption box side view.
Fig. 3 is the energy-absorption box schematic cross-section of hexagon grill unit of the present invention
Fig. 4 is the energy-absorption box schematic cross-section of tetragon grill unit of the present invention.
Fig. 5 is energy-absorption box sectional dimension schematic diagram of the present invention.
Fig. 6 is traditional energy-absorption box sectional dimension schematic diagram.
Fig. 7 is the present invention and traditional energy-absorption box impact kinetic energy curve.
In figure is numbered: 1 is the first connecting plate；2 is box body；3 is the second connecting plate；4 is deformation guide line；5 is bolt hole,
6 is the energy-absorption box of hexagon grill unit；7 is thin-walled column, and 8 is grid wall, and 9 is the energy-absorption box of tetragon grill unit.
Specific embodiment
A kind of bionical energy-absorption box of the present invention, its schematic diagram and middle box body structure respectively as shown in Figure 1, Figure 2 and Figure 3.Should
Bionical energy-absorption box, including the first connecting plate 1, box body 2 and the second connecting plate 3.Box body 2 is by the grid wall of polygon grill unit
8 and the thin-walled column 7 along the setting of cell walls intersection form, thin-walled column and grid wall are prismatic waveform, waveform
Contour line forms deformation guide line 4.First connecting plate 1 and the second connecting plate 3 are separately fixed at the two ends of box body 2, and first even
Fishplate bar and the second connecting plate setting link bolt hole 5, are connected with automobile longitudinal girder and bumper respectively.
Waveform can be sine wave or cosine wave and combinations thereof ripple, can be formed by formed by integrally casting molding or machining mode
(as shown in Figures 1 and 2).
Using abaqus finite element software, shock simulation is carried out to the bionical energy-absorption box (Fig. 5) with sine wave guiding deformation
As a example analysis, and compared with existing conventional automobile tradition energy-absorption box (Fig. 6), illustrate bionical energy-absorption box and there is power consumption surely
Feature that is fixed, making full use of material plasticity deformability.Bionical energy-absorption box (Fig. 5) used by numerical simulation analysis and traditional energy-absorbing
Box (Fig. 6) two side connecting plate thickness 2mm, box body height 60mm, sectional dimension is distinguished as shown in Figure 5 and Figure 6, and two kinds of different suctions
The box body sectional area of energy box is identical, and that is, volume is identical, therefore has more comparability.Wherein bionical energy-absorption box uses sine wave
Guiding hook, and traditional energy-absorption box then adopts broken line to deform groove.It is aluminium alloy that two kinds of energy-absorbing BOX Models adopt material, adopts
S4r unit splits grid, and overall cell number is about 30000, and energy-absorption box is with the velocity shock rigid plate of 70km/h, collision time
0.01s.
Fig. 7 is the two impact kinetic energy versus time curve.From this kinetic energy curve, 1) the bionical energy-absorption box of the present invention
Whole kinetic energy are just absorbed within the time less than 0.01s；And tradition energy-absorption box only absorbs the pact of initial kinetic energy in 0.01s
Half.It means that when a vehicle is in a collision, traditional energy-absorption box can not absorb whole kinetic energy before disabling, then collide
Can be undertaken and dissipating residual kinetic energy by vehicle frame (i.e. automobile main frame) eventually, produce secondary collision injury.Because secondary collision produces
Impulsive force directly undertaken by vehicle frame, lead to its deformation, the serious safety threatening occupant；2) when collision time is
During 0.002s, the speed of traditional energy-absorption box is 57.2km/h, and bionical energy-absorption box speed this moment is 24.7km/h.In collision just
Phase (0～0.002s), bionical energy-absorption box can reduce rapidly the kinetic energy of whole system, reduce impact velocity, decrease by 64%.Meaning
Even if taste generation high velocity impact, bionical energy-absorption box can effectively reduce the speed of collision rift, thus secondary collision is greatly decreased
The injury bringing to vehicle and occupant.
In sum, the bionical energy-absorption box with sine wave guiding deformation has higher deformation energy dissipation capacity, in short-term
Between can effectively reduce the collision rift speed of automobile when colliding.Existing frequently-used vehicle energy absorption box is usually low speed energy-absorption box, that is, pacify
Full speed degree is 35～45km/h, and the safety criterion in Europe is 50km/h.And bionical energy-absorption box can be by safety speed through optimizing expection
Degree is promoted to 70～80km/h, thus the vehicle effectively reducing during traffic accident damages degree and the life security of occupant.According to
The Chinese authority's statistical report, 2010, there is road traffic accident 238351 in the whole nation altogether, cause 67759 people dead, 275125
People is injured.The traffic accident producing serious casualties every time, it is that speed is too fast at all, fails to brake in time.Using bionical energy-absorption box
Automotive safety speed be 70～80km/h it is meant that when urban inner occurs the traffic accident of head-on crash, can basic guarantee car
Interior personal security.On China's highway, speed is generally 100～120km/h.It is typically based on the normal reaction of human pilot, meet
All can touch on the brake to emergency.Only because at a high speed upper speed too fast it is impossible to speed is down to the safety speed of existing energy-absorption box
Degree, that is, within 50km/h, thus results in casualties.When using bionical energy-absorption box, only speed need to be down to 70～80km/h
Within it is possible to ensure occupant safety.This by the great casualty rate reducing personnel when vehicle accident occurs, great should
With being worth.Except automotive field, it is more suitable for Aero-Space, ship buffers the higher field of mechanical property requirements.So it should
Extremely extensive with scope, it is a significant innovation to buffering energy-consumption structure.
Polygonal gird structure of the present invention is not limited to the sandwich of square, and this lattice structure just can also be
Triangle, hexagonal structure.The shape of thin-walled column can be circular or polygon.
A kind of high-strength light of embodiment 1 multi-functional buffering sandwich plate
This structure is except by upper lower plate, and the composition of the grid layer containing thin-walled column is outer, clogs expansion type in the cavities
Padded coaming is to further enhance shock-absorbing capacity.
A kind of high-strength light interlayer curved slab of embodiment 2
This structure is still by upper lower plate, and the composition of the grid layer containing thin-walled column, but when making, by adjusting mould
Tool, realizes plate face and becomes bent by flat, strengthen the scope of application of sheet material.
Claims (7)
1. a kind of bionical energy-absorption box, including the first connecting plate, box body and the second connecting plate, the first connecting plate and the second connecting plate
Be separately fixed at the two ends of box body it is characterised in that: described box body is by the grid wall of polygon grill unit and along grid
The thin-walled column composition of wall intersection setting, described thin-walled column and grid wall are prismatic waveform, in grid wall and thin-walled column
Intersection forms the deformation guide line of waveform.
2. bionical energy-absorption box according to claim 1 it is characterised in that: described deformation guide line waveform be sine wave y=
Asinx or cosine wave y=aconx or composite wave y=a (conx+sinx), its amplitude a is determined by following formula, and wherein p is no just
The maximum compression strength of box body during string ripple, f is required maximum compression strength when using, and x is the change along short transverse for the box body
Amount, dx is the differential to x:
Only sine wave when:
Only cosine wave when:
When sine wave and cosine wave composite wave:
3. bionical energy-absorption box according to claim 2 it is characterised in that: described be provided with sine wave or cosine wave deformation draw
The box body of wire can be formed by formed by integrally casting molding or machining mode.
4. bionical energy-absorption box according to claim 2 it is characterised in that: described polygon grill unit be triangle, four
The polygon grid such as side shape or hexagon.
5. bionical energy-absorption box according to claim 3 it is characterised in that: the material selection steel of energy-absorption box, aluminium alloy or fibre
Dimension composite.
6. bionical energy-absorption box according to claim 4 it is characterised in that: described grid wall two ends and thin-walled column two ends are respectively
It is connected with the first connecting plate and the second connecting plate.
7. bionical energy-absorption box according to claim 1 it is characterised in that: between the first connecting plate and the second connecting plate
Box body quantity be equal to or more than one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610903362.0A CN106347463A (en) | 2016-10-17 | 2016-10-17 | Bionic energy absorption box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610903362.0A CN106347463A (en) | 2016-10-17 | 2016-10-17 | Bionic energy absorption box |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106347463A true CN106347463A (en) | 2017-01-25 |
Family
ID=57866666
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610903362.0A Pending CN106347463A (en) | 2016-10-17 | 2016-10-17 | Bionic energy absorption box |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106347463A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109263584A (en) * | 2018-10-12 | 2019-01-25 | 大连理工大学 | A kind of local surfaces nanosizing metal thin-wall energy absorption device of tandem |
| CN109532731A (en) * | 2018-09-06 | 2019-03-29 | 华侨大学 | A kind of novel car crass energy-absorption box |
| CN110786148A (en) * | 2019-10-09 | 2020-02-14 | 江苏科技大学 | Energy-absorbing riding type mower rollover protection structure |
| CN112032233A (en) * | 2020-08-17 | 2020-12-04 | 西安交通大学 | High-specific energy-absorbing bionic composite material structure and manufacturing method thereof |
| CN114645524A (en) * | 2022-04-08 | 2022-06-21 | 中南大学 | Energy-absorbing part and anti-collision device |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3495474A (en) * | 1966-11-24 | 1970-02-17 | Nissan Motor | Impact absorbing means for vehicles |
| JPS56131849A (en) * | 1980-03-21 | 1981-10-15 | Koryo Miura | Energy absorbing element |
| EP0864467A2 (en) * | 1997-03-06 | 1998-09-16 | YMOS AKTIENGESELLSCHAFT Industrieprodukte | Shock absorber |
| US6085878A (en) * | 1996-12-13 | 2000-07-11 | Toyo Boseki Kabushiki Kaisha | Impact absorber made of resin |
| US20070083965A1 (en) * | 2005-09-20 | 2007-04-19 | Sport Helmets Inc. | Lateral displacement shock absorbing material |
| JP2009063013A (en) * | 2007-09-04 | 2009-03-26 | Mazda Motor Corp | Energy absorbing member |
| CN202294642U (en) * | 2011-07-22 | 2012-07-04 | 浙江吉利汽车研究院有限公司 | Energy-absorption box |
| CN104462731A (en) * | 2015-01-07 | 2015-03-25 | 湖南大学 | Method for designing sinusoidal corrugated energy absorption tube |
| WO2015145239A1 (en) * | 2014-03-24 | 2015-10-01 | Toyota Jidosha Kabushiki Kaisha | Vehicle energy absorption structure and energy absorption member |
| CN105196937A (en) * | 2014-06-03 | 2015-12-30 | 现代自动车株式会社 | Crash Box For Vehicle |
| CN205524081U (en) * | 2016-01-26 | 2016-08-31 | 北京长城华冠汽车科技股份有限公司 | Energy -absorbing box and including car of this energy -absorbing box |
| CN206107338U (en) * | 2016-10-17 | 2017-04-19 | 东南大学 | Bionical energy -absorbing box |
-
2016
- 2016-10-17 CN CN201610903362.0A patent/CN106347463A/en active Pending
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3495474A (en) * | 1966-11-24 | 1970-02-17 | Nissan Motor | Impact absorbing means for vehicles |
| JPS56131849A (en) * | 1980-03-21 | 1981-10-15 | Koryo Miura | Energy absorbing element |
| US6085878A (en) * | 1996-12-13 | 2000-07-11 | Toyo Boseki Kabushiki Kaisha | Impact absorber made of resin |
| EP0864467A2 (en) * | 1997-03-06 | 1998-09-16 | YMOS AKTIENGESELLSCHAFT Industrieprodukte | Shock absorber |
| US20070083965A1 (en) * | 2005-09-20 | 2007-04-19 | Sport Helmets Inc. | Lateral displacement shock absorbing material |
| JP2009063013A (en) * | 2007-09-04 | 2009-03-26 | Mazda Motor Corp | Energy absorbing member |
| CN202294642U (en) * | 2011-07-22 | 2012-07-04 | 浙江吉利汽车研究院有限公司 | Energy-absorption box |
| WO2015145239A1 (en) * | 2014-03-24 | 2015-10-01 | Toyota Jidosha Kabushiki Kaisha | Vehicle energy absorption structure and energy absorption member |
| CN105196937A (en) * | 2014-06-03 | 2015-12-30 | 现代自动车株式会社 | Crash Box For Vehicle |
| CN104462731A (en) * | 2015-01-07 | 2015-03-25 | 湖南大学 | Method for designing sinusoidal corrugated energy absorption tube |
| CN205524081U (en) * | 2016-01-26 | 2016-08-31 | 北京长城华冠汽车科技股份有限公司 | Energy -absorbing box and including car of this energy -absorbing box |
| CN206107338U (en) * | 2016-10-17 | 2017-04-19 | 东南大学 | Bionical energy -absorbing box |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109532731A (en) * | 2018-09-06 | 2019-03-29 | 华侨大学 | A kind of novel car crass energy-absorption box |
| CN109263584A (en) * | 2018-10-12 | 2019-01-25 | 大连理工大学 | A kind of local surfaces nanosizing metal thin-wall energy absorption device of tandem |
| CN110786148A (en) * | 2019-10-09 | 2020-02-14 | 江苏科技大学 | Energy-absorbing riding type mower rollover protection structure |
| CN110786148B (en) * | 2019-10-09 | 2021-04-27 | 江苏科技大学 | Energy-absorbing riding type mower rollover protection structure |
| CN112032233A (en) * | 2020-08-17 | 2020-12-04 | 西安交通大学 | High-specific energy-absorbing bionic composite material structure and manufacturing method thereof |
| CN114645524A (en) * | 2022-04-08 | 2022-06-21 | 中南大学 | Energy-absorbing part and anti-collision device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106347463A (en) | Bionic energy absorption box | |
| CN206107338U (en) | Bionical energy -absorbing box | |
| CN101962002B (en) | Anticollision device for rear of truck | |
| CN106892314B (en) | A kind of nesting round tube shock resistance multilevel energy absorption plant | |
| CN111301525A (en) | Automobile front longitudinal beam filled with negative Poisson ratio honeycomb material | |
| CN206217824U (en) | A kind of multi-buffer energy adsorption type automobile dumper device | |
| CN106427846A (en) | Multi-stage buffer energy-absorbing type automobile bumper device | |
| CN106672010A (en) | Motor train unit head train passive safety protection device | |
| CN208593365U (en) | A kind of electric car anti-collision beam energy absorbing box | |
| CN101857001B (en) | Small car front bumper with significant energy-absorbing effect | |
| CN106004918A (en) | Railway vehicle energy absorption unit beam | |
| CN205044684U (en) | A buffer stop for car body | |
| CN110374032B (en) | Easily resume formula prevents that car hits device and prevents car and hits bridge | |
| CN104527555B (en) | Collision energy absorbing device with various energy absorbing forms and application thereof | |
| CN206288027U (en) | A kind of EMUs head car passive security protector | |
| CN208198324U (en) | Energy-absorption box based on hierarchical cellular structure | |
| CN202989819U (en) | Flexible expressway guardrail | |
| CN205554105U (en) | Composite construction's car energy -absorbing box | |
| CN111605568A (en) | Diesel locomotive cab with multistage collision protection | |
| CN201685776U (en) | Double-energy-absorption small car front anti-collision beam | |
| CN204527083U (en) | A kind of automobile collision preventing girder construction and vehicle | |
| CN206171374U (en) | Car bumper buffer structure | |
| CN106379263B (en) | A kind of bumper buffer structure | |
| CN209082396U (en) | Highway safety protective fence | |
| CN106515636A (en) | Energy absorption type front lower protective beam device for automobile |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20170125 |
|
| WD01 | Invention patent application deemed withdrawn after publication |