CN103287369A - Multistage embedded type octagonal automobile energy absorbing and buffering device - Google Patents
Multistage embedded type octagonal automobile energy absorbing and buffering device Download PDFInfo
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- CN103287369A CN103287369A CN2013102470577A CN201310247057A CN103287369A CN 103287369 A CN103287369 A CN 103287369A CN 2013102470577 A CN2013102470577 A CN 2013102470577A CN 201310247057 A CN201310247057 A CN 201310247057A CN 103287369 A CN103287369 A CN 103287369A
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Abstract
The invention discloses a multistage embedded type octagonal automobile energy absorbing and buffering device to solve the problem of an existing automobile energy absorbing and buffering device and designs the energy absorbing and buffering device which is composed of multistage thin-wall energy absorbing cylinders in a embedded and cascaded mode. The multistage embedded type octagonal automobile energy absorbing and buffering device mainly comprises an outer layer thin-wall energy absorbing cylinder (1), an inner layer thin-wall energy absorbing cylinder (2), inter-layer thin-wall energy absorbing cylinder connecting plates (3) and a rear end installation plate (4), wherein both the outer layer thin-wall energy absorbing cylinder (1) and the inner layer thin-wall energy absorbing cylinder (2) of the energy absorbing and buffering device are of an octagonal structure, the inner layer thin-wall energy absorbing cylinder (2) is reduced by a certain length in the axial direction in comparison with the outer layer thin-wall energy absorbing cylinder (1), and therefore stage-by-stage energy absorption can be conducted through multiple layers of energy absorbing cylinders. Meanwhile, all layers of thin-wall energy absorbing cylinders are connected through the four thin-wall energy absorbing cylinder connecting plates (3), and stability in the automobile crashing process is increased. The multistage embedded type octagonal automobile energy absorbing and buffering device has the advantages of being high in specific energy absorption, large in average striking force, small in peak value of the striking force and the like.
Description
Technical field
The present invention is mainly concerned with automotive crash safety structure design field, refers in particular to a kind of multistage nested type octagon automobile energy-absorbing shock absorber.
Background technology
Along with the increase of automobile pollution, automotive crash safety becomes an important subject under discussion gradually.In the structure design field, in order to guarantee the safety of occupant when automobile bumps, generally can crash energy absorption equipment be arranged in the automotive front end design, comprise Federal bumper, automatic buffer energy-absorbing beam etc.These buffering energy-absorbing structures generally are made up of single circular energy-absorbing beam, square energy-absorbing beam or polygon energy-absorbing beam, the energy-absorbing beam energy-absorbing effect of these structures is relatively poor, and in collision process, be easy to generate bigger impact force peak value, cause more serious injury to the occupant.And the impact force fluctuation in collision process of this single energy-absorbing girder construction is bigger, and failure phenomenons such as bending take place the energy-absorbing beam easily, cause the collision energy of automobile almost all to be born by automobile longitudinal girder.Generally in order to improve the efficient of automotive front end energy-absorbing, can increase the length of wall thickness and the energy-absorbing beam of automobile energy-absorbing beam, but the wall thickness that increases the energy-absorbing beam can cause the increase of car mass surely, thereby make that automobile weight-saving purpose obtains weakening.And the preceding end spaces of general vehicle is limited, and increasable automobile energy-absorbing beam length also can be restricted.A kind of multistage nested type octagon automobile energy-absorbing shock absorber of the present invention's design is to can be used as independently crash energy absorption equipment installation to use jointly with the automobile automotive front end or with Federal bumper, improves automotive front end energy-absorbing efficient.
Summary of the invention
The technical problem to be solved in the present invention just is: at the problem that existing automobile energy-absorbing shock absorber exists, the invention provides a kind of than energy-absorbing height, the big and low multistage nested type octagon automobile energy-absorbing shock absorber of impact force peak value of collision impact force.Simultaneously apparatus of the present invention have been carried out the contrast of energy-absorbing effect with existing crash energy absorption equipment under different collision velocitys, apparatus of the present invention have energy-absorbing effect preferably.
For solving the problems of the technologies described above, the solution that the present invention proposes is:
Invented a kind of multistage nested type octagon automobile energy-absorbing shock absorber, it is characterized in that, this automobile energy-absorbing shock absorber is become by multistage thin-walled energy-absorbing tube nesting level joint group, can be stretched or is welded by one-shaping technique.It mainly comprises outer thin-walled energy-absorbing tube (1), internal layer thin-walled energy-absorbing tube (2), each layer thin-walled energy-absorbing tube connecting panel (3) and rear end adapter plate (4), outer thin-walled energy-absorbing tube (1) and the internal layer thin-walled energy-absorbing tube (2) of this energy-absorbing buffering device are eight-sided formation, connected by four thin-walled energy-absorbing tube connecting panels (3) between each layer thin-walled energy-absorbing tube, increase the stability in the automobile collision procedure.Simultaneously, internal layer thin-walled energy-absorbing tube (2) reduces certain length in the axial direction than outer thin-walled energy-absorbing tube (1), can carry out the classification energy-absorbing by multilayer energy-absorbing tube like this.Outer thin-walled energy-absorbing tube (1) front position design has collision-induced hole (5), can reduce the initial spike of impact force.Each layer thin-walled energy-absorbing tube rear end is concordant and be welded on the rear end adapter plate (4), and rear end adapter plate (4) is connected with the automobile front side member by rear end adapter plate tie bolt (6).
The designed multistage nested type octagon automobile energy-absorbing shock absorber outside octagon energy-absorbing tube when collision takes place of the present invention at first contacts with the rigidity obstacle, produces a bigger initial contact peak value.After initial spike, acceleration/accel begins to reduce.And this moment, inboard energy-absorbing tube began to contact with the rigidity obstacle, also can produce simultaneously an initial contact peak value, namely the trough of outside energy-absorbing tube and the crest of inboard energy-absorbing tube superpose, make progressive compression stage fluctuate round initial contact peak value, increased the average impact force in the collision process.Because the stack of peak valley makes that the amplitude of impact curve fluctuation is less, designed two-level nested formula energy-absorbing beam is out of shape more fully and steadily, has reduced member the probability that lost efficacy takes place to bend simultaneously.Can not meet the requirements of for two-level nested formula energy-absorbing beam, can carry out three grades nested or more multistage nested, occur increasing one-level energy-absorbing beam than the great fluctuation process place at energy-absorbing beam impact curve and carry out the peak valley stack, thereby make the energy-absorbing beam to require to be out of shape according to expection.
[0006] description of drawings
Fig. 1 is three-dimensional structure scheme drawing of the present invention;
Fig. 2 is scantling of structure scheme drawing of the present invention;
Fig. 3 is the energy-absorbing girder construction scheme drawing of different cross section shape of the present invention;
Fig. 4 is the energy-absorbing beam acceleration squiggle figure of different cross section shape of the present invention;
Fig. 5 is octagon of the present invention and two-level nested formula energy-absorbing beam middling speed impact curve correlation curve figure;
Fig. 6 is octagon of the present invention and two-level nested formula energy-absorbing deck-molding speed impact curve correlation curve figure;
Fig. 7 is octagon of the present invention and two-level nested formula energy-absorbing beam low speed collision curve correlation curve figure;
Marginal data
1, outer thin-walled energy-absorbing tube 2, internal layer thin-walled energy-absorbing tube
3, each layer thin-walled energy-absorbing tube connecting panel 4, rear end adapter plate
5, collision-induced hole 6, rear end adapter plate tie bolt
The specific embodiment
Below with reference to the drawings and specific embodiments the present invention is described in further details.
In this specific embodiment, designed two-level nested formula energy-absorbing buffering device as requested, as shown in Figure 1, its main application is the energy-absorbing beam between automobile front side member and the Federal bumper.This two-level nested formula energy-absorbing beam has comprised outside energy-absorbing tube (1), internal layer energy-absorbing tube (2), each layer energy-absorbing tube connecting panel (3) and rear end adapter plate (4).Outside energy-absorbing tube (1) and internal layer energy-absorbing tube (2) are eight-sided formation, its scantling of structure as shown in Figure 2, the outside energy-absorbing cylinder size length of side is 44mm, axial length is 400mm, the length of side of inboard energy-absorbing tube is 27.2mm, inboard energy-absorbing tube has reduced 25mm in the axial direction than outside energy-absorbing tube, and length is 375mm, and outside energy-absorbing tube (1) and internal layer energy-absorbing tube (2) wall thickness are 1.1mm.The advantage that has structure aspects for checking octagon energy-absorbing beam, automobile energy-absorbing beam to the different cross section shape is analyzed, comprise square energy-absorbing beam, circular energy-absorbing beam, hexagon energy-absorbing beam and octagon energy-absorbing beam, the energy-absorbing girder construction of different cross section as shown in Figure 3, each energy-absorbing beam axial length is 400mm, wall thickness is 2mm, has identical sectional area.The energy-absorbing effect contrast of the energy-absorbing beam of different cross section shape is as shown in table 1, the trolley impact acceleration/accel waveform curve of different cross section shape energy-absorbing beam as shown in Figure 4, as can be seen from Table 1, from quadrangle, hexagon to octagon, the ratio energy-absorbing of energy-absorbing beam and average impact force increase gradually, and the impact force peak change is little.Round section energy-absorbing beam also has higher ratio energy-absorbing and average impact force, but the impact force peak value is higher, and the occupant is not had the better protect effect.
The contrast of table 1 different cross section shape energy-absorbing beam energy-absorbing effect
In this specific embodiment, designed two-level nested formula energy-absorbing beam outside octagon energy-absorbing tube when collision takes place at first contacts with the rigidity obstacle, produce a bigger initial contact peak value, because multiple stage energy-absorbing beam wall thickness is less, the initial contact peak value that produces does not have former octagon energy-absorbing beam peak value height.After initial spike, acceleration/accel begins to reduce.And this moment, inboard energy-absorbing tube began to contact with the rigidity obstacle, also can produce simultaneously an initial contact peak value, namely the trough of outside energy-absorbing tube and the crest of inboard energy-absorbing tube superpose, make progressive compression stage fluctuate round initial contact peak value, increased the average impact force in the collision process.Because the stack of peak valley makes that the amplitude of impact curve fluctuation is less, designed two-level nested formula energy-absorbing beam is out of shape more fully and steadily, has reduced member the probability that lost efficacy takes place to bend simultaneously.Can not meet the requirements of for two-level nested formula energy-absorbing beam, can carry out three grades nested or more multistage nested, occur increasing one-level energy-absorbing beam than the great fluctuation process place at energy-absorbing beam impact curve and carry out the peak valley stack, thereby make the energy-absorbing beam to require to be out of shape according to expection.
Below will the energy-absorbing effect of two-level nested formula energy-absorbing beam under different collision velocitys designed in octagon energy-absorbing beam and this specific embodiment be compared, wherein different collision velocitys are divided into low speed collision, middling speed collision and high-speed crash.
The designed two-level nested formula energy-absorbing beam chassis acceleration/accel waveform under the middling speed collision as shown in Figure 5 in octagon energy-absorbing beam and this specific embodiment, octagon energy-absorbing beam has produced a bigger contact peak value at initial time, then be reduced to certain value and near this value, fluctuate, dropped to zero rapidly because energy all absorbs at last.Designed two-level nested formula energy-absorbing beam in this specific embodiment produces a bigger peak value constantly in initial collision, and curve fluctuates at the peak value place then, and last because energy all is converted into plastic deformation ability and reaches null value rapidly.The contrast of the energy-absorbing effect of designed two-level nested formula energy-absorbing beam is as shown in table 2 in octagon energy-absorbing beam and this specific embodiment, as can be seen from the table, when the two impact force peak value was identical, multiple stage energy-absorbing girder construction had remarkable advantages than octagon energy-absorbing girder construction.Wherein topmostly improved 22% than energy-absorbing SEA, average impact force has improved 22.3%, and multiple stage energy-absorbing girder construction has better energy-absorbing effect under identical quality.And load ratio has improved 23.3%, and namely multiple stage energy-absorbing girder construction has more stable endergonic process, has reduced the probability that thin-wall part lost efficacy in the collision process.Compression distance has reduced 11.9%, can absorb more energy in the limited distance of automotive front end.
[0015] table 2 octagon and two-level nested formula energy-absorbing beam middling speed collision energy-absorbing effect contrast down
The designed chassis acceleration/accel waveform of two-level nested formula energy-absorbing beam under high-speed crash as shown in Figure 6 in octagon energy-absorbing beam and this specific embodiment, as can be seen from the figure, multiple stage energy-absorbing beam energy-absorbing under high-speed crash is more steady, and the fluctuation of octagon energy-absorbing beam is bigger, and the later stage compressed fully in collision, cause final stage to produce a bigger crest.Table 3 is both energy-absorbing effect contrasts, and multistage endergonic structure has improved 18.6% than octagon endergonic structure than energy-absorbing, and the impact force aviation value has improved 7.8%, and the impact force peak value has reduced by 12.1%.It is the conquassation fully of collision later stage octagon endergonic structure that the impact force aviation value improves less reason, cause producing a bigger later stage crest, thereby improved average impact force, and the impact force peak value also becomes greatly thereupon.But load ratio has increased by 22.6%, with 23.3% being more or less the same before.
Table 3 octagon and two-level nested formula energy-absorbing deck-molding speed collision energy-absorbing effect contrast down
The designed chassis acceleration/accel waveform of two-level nested formula energy-absorbing beam under low speed collision as shown in Figure 7 in octagon energy-absorbing beam and this specific embodiment, as can be seen from the figure, multiple stage energy-absorbing beam same energy-absorbing under low speed collision is more steady, and the fluctuation of octagon energy-absorbing beam is bigger.Table 4 is both energy-absorbing effect contrasts, and multistage endergonic structure has improved 5.5% than octagon endergonic structure than energy-absorbing, and the impact force aviation value has improved 11.5%, and the impact force peak value has reduced by 16.1%.But multiple stage energy-absorbing beam compression distance has increased by 6.2% than octagon energy-absorbing beam, major cause is because the inboard energy-absorbing tube of multiple stage energy-absorbing beam front end has reduced 25mm than the outside, more in short-term, this performance improves and is not obvious, perhaps can slightly descend in the reduced overall distance.
Energy-absorbing effect contrast under table 4 octagon and the two-level nested formula energy-absorbing beam low speed collision
Claims (6)
1. multistage nested type octagon automobile energy-absorbing shock absorber, it mainly comprises outer thin-walled energy-absorbing tube (1), internal layer thin-walled energy-absorbing tube (2), each layer thin-walled energy-absorbing tube connecting panel (3) and rear end adapter plate (4), it is characterized in that: this automobile energy-absorbing shock absorber is become by multistage thin-walled energy-absorbing tube nesting level joint group, can be stretched or is welded by one-shaping technique.
2. according to the described a kind of multistage nested type octagon automobile energy-absorbing shock absorber of claim l, it is characterized in that: outer thin-walled energy-absorbing tube (1) and the internal layer thin-walled energy-absorbing tube (2) of this automobile energy-absorbing shock absorber are eight-sided formation, connect with four thin-walled energy-absorbing tube connecting panels (3) between each layer thin-walled energy-absorbing tube.
3. according to claim l and 2 described a kind of multistage nested type octagon automobile energy-absorbing shock absorbers, it is characterized in that: internal layer thin-walled energy-absorbing tube (2) reduces certain length in the axial direction than outer thin-walled energy-absorbing tube (1), carries out the classification energy-absorbing by multilayer energy-absorbing tube.
4. according to claim l and 2 described a kind of multistage nested type octagon automobile energy-absorbing shock absorbers, it is characterized in that: the design of outer thin-walled energy-absorbing tube (1) front position has collision-induced hole (5), can reduce the collision initial spike.
5. according to the described a kind of multistage nested type octagon automobile energy-absorbing shock absorber of claim l, it is characterized in that: each layer thin-walled energy-absorbing tube rear end is concordant and be welded on the rear end adapter plate (4), and rear end adapter plate (4) is connected with the automobile front side member by rear end adapter plate tie bolt (6).
6. according to claim l, 2,3 and 5 described a kind of multistage nested type octagon automobile energy-absorbing shock absorbers, it is characterized in that: this automatic buffer energy absorption device not only comprises two-level nested tandem type structure, also comprises three grades or more multistage nested tandem type structure.
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| CN2013102470577A CN103287369A (en) | 2013-06-20 | 2013-06-20 | Multistage embedded type octagonal automobile energy absorbing and buffering device |
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| CN2013102470577A CN103287369A (en) | 2013-06-20 | 2013-06-20 | Multistage embedded type octagonal automobile energy absorbing and buffering device |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103818330A (en) * | 2014-02-20 | 2014-05-28 | 奇瑞汽车股份有限公司 | Vehicular anti-collision energy absorption box |
| CN103963728A (en) * | 2014-05-12 | 2014-08-06 | 北京汽车研究总院有限公司 | Torsion rod spring device and automobile |
| CN104442647A (en) * | 2014-11-21 | 2015-03-25 | 黄荣丰 | Novel vehicle bumper |
| CN107512316A (en) * | 2017-08-16 | 2017-12-26 | 吉林大学 | A kind of segment type automobile B-column structure |
| CN108032827A (en) * | 2018-01-12 | 2018-05-15 | 吉林大学 | A kind of vehicle energy absorption box with two-stage endergonic structure |
| CN109484346A (en) * | 2018-10-23 | 2019-03-19 | 华侨大学 | Truck tail anti-collision structure |
| CN111503204A (en) * | 2020-04-20 | 2020-08-07 | 中南大学 | Multilevel energy absorption pipe |
| US11021122B1 (en) | 2019-11-21 | 2021-06-01 | Ford Global Technologies, Llc | Vehicle crush-can assembly and crush-can assembly providing method |
| CN114148366A (en) * | 2021-12-08 | 2022-03-08 | 中车株洲电力机车有限公司 | Double-layer square tube combined energy absorption structure for rail vehicle collision energy absorption |
| CN114379488A (en) * | 2022-01-24 | 2022-04-22 | 中南大学 | Bionic gradient multi-stage tubular structure |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001124128A (en) * | 1999-10-26 | 2001-05-08 | Tokai Rubber Ind Ltd | Polygonal hollow member for absorbing impact |
| CN201040514Y (en) * | 2007-06-01 | 2008-03-26 | 奇瑞汽车有限公司 | Crash-proof energy-absorbing device for automobile |
| KR20120039335A (en) * | 2010-10-15 | 2012-04-25 | 현대자동차주식회사 | Crash box |
| CN202764894U (en) * | 2012-09-21 | 2013-03-06 | 吉林大学 | Bionic energy absorption tube imitating bamboo structure |
| CN202783043U (en) * | 2012-08-30 | 2013-03-13 | 浙江吉利汽车研究院有限公司杭州分公司 | Automobile energy adsorption box |
-
2013
- 2013-06-20 CN CN2013102470577A patent/CN103287369A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001124128A (en) * | 1999-10-26 | 2001-05-08 | Tokai Rubber Ind Ltd | Polygonal hollow member for absorbing impact |
| CN201040514Y (en) * | 2007-06-01 | 2008-03-26 | 奇瑞汽车有限公司 | Crash-proof energy-absorbing device for automobile |
| KR20120039335A (en) * | 2010-10-15 | 2012-04-25 | 현대자동차주식회사 | Crash box |
| CN202783043U (en) * | 2012-08-30 | 2013-03-13 | 浙江吉利汽车研究院有限公司杭州分公司 | Automobile energy adsorption box |
| CN202764894U (en) * | 2012-09-21 | 2013-03-06 | 吉林大学 | Bionic energy absorption tube imitating bamboo structure |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103818330A (en) * | 2014-02-20 | 2014-05-28 | 奇瑞汽车股份有限公司 | Vehicular anti-collision energy absorption box |
| CN103963728A (en) * | 2014-05-12 | 2014-08-06 | 北京汽车研究总院有限公司 | Torsion rod spring device and automobile |
| CN104442647A (en) * | 2014-11-21 | 2015-03-25 | 黄荣丰 | Novel vehicle bumper |
| CN107512316A (en) * | 2017-08-16 | 2017-12-26 | 吉林大学 | A kind of segment type automobile B-column structure |
| CN107512316B (en) * | 2017-08-16 | 2023-05-16 | 吉林大学 | Sectional type automobile B column structure |
| CN108032827B (en) * | 2018-01-12 | 2023-05-16 | 吉林大学 | Automobile energy absorption box with two-stage energy absorption structure |
| CN108032827A (en) * | 2018-01-12 | 2018-05-15 | 吉林大学 | A kind of vehicle energy absorption box with two-stage endergonic structure |
| CN109484346A (en) * | 2018-10-23 | 2019-03-19 | 华侨大学 | Truck tail anti-collision structure |
| US11021122B1 (en) | 2019-11-21 | 2021-06-01 | Ford Global Technologies, Llc | Vehicle crush-can assembly and crush-can assembly providing method |
| CN111503204A (en) * | 2020-04-20 | 2020-08-07 | 中南大学 | Multilevel energy absorption pipe |
| CN114148366A (en) * | 2021-12-08 | 2022-03-08 | 中车株洲电力机车有限公司 | Double-layer square tube combined energy absorption structure for rail vehicle collision energy absorption |
| CN114379488A (en) * | 2022-01-24 | 2022-04-22 | 中南大学 | Bionic gradient multi-stage tubular structure |
| CN114379488B (en) * | 2022-01-24 | 2024-03-08 | 中南大学 | Bionic gradient multistage tubular structure |
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Application publication date: 20130911 |