CN100445134C - Energy absorption device for automobile front beam - Google Patents
Energy absorption device for automobile front beam Download PDFInfo
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- CN100445134C CN100445134C CNB200510124914XA CN200510124914A CN100445134C CN 100445134 C CN100445134 C CN 100445134C CN B200510124914X A CNB200510124914X A CN B200510124914XA CN 200510124914 A CN200510124914 A CN 200510124914A CN 100445134 C CN100445134 C CN 100445134C
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- energy absorber
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- front beam
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Abstract
The present invention discloses one kind of energy absorber for front automobile bumper and the energy absorber is installed on the inner side of front automobile bumper to absorb collision. The energy absorber includes one intermediate element, one right angular element and one left angular element on two sides of the intermediate element. The present invention features that the relatively thick intermediate element is made of foamed resin in high foaming factor and the thinner angular elements are made of foamed resin in low foaming factor, so as to result in high collision absorbing effect and high rigidity.
Description
Technical field
The present invention relates to a kind of energy absorber (absorber) that is used for automobile front beam; it is installed in the inboard of automobile front beam; relate in particular to a kind of energy absorber that is used for automobile front beam; wherein energy absorber is manufactured into the parts that are divided into three density areas; a foam unit is arranged, so that in collision accident, protect the pedestrian by reducing the deceleration/decel initial value in energy absorber.
Background technology
As shown in Figure 1; automobile front beam zone comprises a front bumper cover 2 ', an energy absorber 1 ', the back rest 3 ', a radiator 4 (radiator) and a low stiffener 5 '; described low stiffener 5 ' is used for the base part of inline bumper/spoiler cover 2 ' of order and radiator 4, alleviates when bumping with convenient automobile and pedestrian and impacts and the protection pedestrian.
Fig. 1 shows the state of the vehicle impact testing with the leg shape foam 10 ' that is hit element, wherein when automotive front and the 10 ' collision of leg shape foam, the energy absorber 1 ' that combines with bumper/spoiler cover 2 ' plays the effect that absorbs collision and reduce car speed, reduces the injury to pedestrian's organ thus.
Energy absorber 1 ' is typically made by polypropylene (polypropylene).
When making this energy absorber, resin material utilizes steam chamber (steam chest) method to be ejected on the molded afterwards mould of energy absorber 1 ', then to the foam heating and firsthand data is expanded.
As known in art technology, resin form shows following trend: along with expansion ratio (foaming magnification) increases, interparticle distance and degrees of expansion increase, and density and intensity reduce, otherwise when expansion ratio reduces, interparticle distance and degrees of expansion reduce, and density and intensity increase.
Yet, traditional energy absorber 1 ' comprises the centre part 10 ' with 80mm thickness, with lay respectively at the centre part 10 ' left and right sides, left comer and right corner parts (corner part) 12 ' with 65mm thickness, as shown in Figure 2, wherein energy absorber uses the resin foam manufacturing, and its expansion ratio is 40.
The centre part of energy absorber and the thickness difference between the corner assembly are determined, because the design of automobile must be designed to circle with the corner assembly of bumper/spoiler; For this purpose, force following restriction: corner assembly should manufacture than the thin about 15mm of centre part.
Yet; check when governing criterion in the pedestrian impact protection rules that reference European Union implements obtain in the Collision test of using energy absorber as a result the time; although problem just be when automobile front beam during with the collision of lower leg shape foam components the centre part of energy absorber meet above-mentioned rules; but corner assembly can not satisfy above-mentioned rules, because deceleration/decel can not suitably be controlled when the deceleration/decel initial value is too high.
Consider that The above results is because collision can not effectively be absorbed caused by energy absorber, because the thickness of corner assembly is thinner relatively, though expansion ratio be 40 polypropylene foam relative relatively poor aspect density, tensile strength and the compression strength: the apparent density of polypropylene foam (apparent density) scope is 0.023g/cm
3To 0.003g/cm
3, the tensile strength lower limit is 2.4kgf/cm
2With the compression strength lower limit be about 0.85kgf/cm
2(when bulk compressibility is 20%).
Summary of the invention
Therefore; the present invention is made into to solve the problem that occurs in the above-mentioned prior art; the purpose of this invention is to provide a kind of energy absorber that is used for automobile front beam; it is characterized in that; this energy absorber is installed in the inboard of automobile front beam; and be manufactured into the parts that are divided into three density areas, and a foam unit is arranged in energy absorber, so that when bumping, protect the pedestrian by the initial value that reduces deceleration/decel.
In order to achieve this end, a kind of energy absorber that is used for automobile front beam is provided, wherein energy absorber is installed in the inboard of automobile front beam to absorb collision, energy absorber comprises: a centre part, and the corner assembly that is placed on centre part left side and right side respectively is characterized in that, centre part is made thicklyer than corner assembly, it uses the resin foam with the high magnification foaming, and corner assembly is made thinlyyer than centre part, and it uses the resin foam with the low range foaming.
According to embodiments of the invention, resin foam is a polypropylene foam, and the expansion ratio of the resin foam of centre part is 40, and the expansion ratio of the resin foam of corner assembly is 15.
In addition, the foam unit that is recessed road (cancave channel) form longitudinally is formed at the underside area place of the preceding centre part of energy absorber of the present invention.
Description of drawings
Above and other objects of the present invention, feature and advantage can be more obvious together with accompanying drawing by following detailed specification sheets, wherein:
The cross sectional drawing of the collision of orthodox car front bumper in Fig. 1 display automobile Collision test;
Fig. 2 shows the transparent view of conventional energy resorber rear side;
Fig. 3 shows the transparent view according to energy absorber rear side of the present invention;
Fig. 4 shows the transparent view of preceding centre part of the energy absorber of invention;
Fig. 5 shows the cross sectional drawing of crushable vehicle front bumper in vehicle impact testing of invention; And
Fig. 6 shows the curve of going down on one's knees angle and concerning between the time based on the present invention's test results compared with prior art.
The specific embodiment
Hereinafter, the preferred embodiments of the present invention are described with reference to the drawings.In following description and accompanying drawing, identical Reference numeral is used to indicate same or analogous parts, so being repeated in this description of relevant same or similar parts can be omitted.
Fig. 3 shows the transparent view of energy absorber 1 rear side of the present invention, and its overall structure is same as the prior art.
Energy absorber 1 of the present invention comprises centre part 10 and is placed on two corner assemblies 12 of centre part 10 opposition sides respectively.
Although the border between centre part 10 and two corner assemblies 12 represents that by a dotted line the present invention is not subjected to the restriction of boundary line, it can change according to the manufacturing equipment and the installation environment of this energy absorber.
What the energy absorber of energy absorber 1 of the present invention and prior art was identical is, the thickness of centre part is 80mm, and the thickness of corner assembly 12 is approximately 65mm, and this is same as the prior art.Yet, energy absorber 1 of the present invention be different from prior art energy absorber be that centre part is the resin foam in order to the foaming of relative high magnification, for example, expansion ratio is 40, and corner assembly 12 is the resin foams in order to relative low range foaming, for example, expansion ratio is 12.
When polypropylene foam foamed with expansion ratio 12, polypropylene foam is relative better aspect density, tensile strength and compression strength: apparent density was at about 0.060g/cm
3To 0.005g/cm
3Scope in, the about 6.0kgf/cm of tensile strength lower limit
2, the big approximately 2.0kgf/cm of compression strength lower limit
2(when bulk compressibility is 20%).Thus,, can expect to increase the rigidity and the impact absorption effect of energy absorber if polypropylene foam is used to energy absorber 1, particularly, at the corner assembly place.
Although above-mentioned energy absorber of the present invention 1 is manufactured with a single-piece, it is made up of the parts that inside is divided into three density areas, just, and a centre part 10 and two corner assemblies 12.
The deficiency that causes because of low-intensity and density in centre part 10 compensates by the thickness that increases centre part 10, the deficiency that causes because of thin thickness in corner assembly 12 compensates by intensity and the density that increases corner assembly, and therefore the structure of better enhancing and the balance of impact absorption ability evenly are not provided on the whole length of energy absorber 1 with changing.
Fig. 4 shows the transparent view of the preceding centre part of energy absorber 1 of the present invention, and its total structure is similar but be different from the structure of prior art, because foam unit F is arranged on its underside area with recessed road form.Foam unit F extends and forms in both sides to the left and right with respect to the longitudinal center of energy absorber 1, and wherein the length of foam unit F depends on the corresponding adjustment with experimental enviroment of vehicle, even extends to corner assembly.
The advantage of foam unit F is, additional space is provided foam unit so that the space that allows to be answered by collision parts mobile phase in collision accident, be that also foam unit F increases the impact absorption zone that energy absorber 10 surrounds shape space, recessed road, therefore collision can more effectively be absorbed, foam unit F can reduce the initial value of deceleration/decel, particularly, after collision.
Fig. 5 shows the cross sectional drawing of the collision of the automobile front beam in the vehicle impact testing of similar Fig. 1, this experimental test be energy absorber 1 of the present invention.
Preferably, foam unit F is placed on the following approximately distance of 66mm of line of centers between upside leg shape foam components and the downside leg shape foam components.
This is because sensor is placed on this position, and this position is extremely important in the lower portion of protection pedestrian leg, and described sensor is used for measuring at vehicle impact testing and downside leg shape foam collision deceleration/decel constantly.
Fig. 6 shows that contrast the present invention and prior art downside leg shape foam place in test shown in Figure 5 reach the test results curve of the time that the angle spent (X-Y) of going down on one's knees.Prior art is represented that by solid line the present invention is illustrated by the broken lines.
As appreciable from curve, compared with prior art, the present invention requires more time before arriving predetermined bend angle, this means that the initial value of the deceleration/decel according to the present invention is significantly reduced.
In addition, because bend angle does not surpass 13 degree in the present invention, significantly improve so can determine to compare in energy absorber of the present invention the impact absorption effect with traditional resorber.
As mentioned above; according to the present invention; be installed in energy absorber in the gas front bumper by manufacturing; described energy absorber is the parts that are divided into three density areas; foam unit is set in energy absorber, and the initial value that reduces deceleration/decel is possible with protection pedestrian and impact absorption effect and the rigidity of significantly improving energy absorber.
Although described the preferred embodiments of the present invention for purpose of explanation, the person skilled in the art can be appreciated that various modifications under the situation that does not break away from disclosed scope of the present invention and essence as the appended claim book, interpolation and substitutes is possible.
Claims (2)
1, a kind of energy absorber that is used for automobile front beam, wherein energy absorber be installed in automobile front beam the inboard to absorb collision, energy absorber comprises:
Centre part, and the corner assembly that is placed on centre part left side and right side respectively,
It is characterized in that centre part is made thicklyer than corner assembly, it uses the resin foam with the high magnification foaming, and corner assembly is made thinlyyer than centre part, and it uses the resin foam with the low range foaming; Foam unit longitudinally is formed at the underside area place of the preceding centre part of energy absorber with recessed road form.
2, energy absorber as claimed in claim 1 is characterized in that, resin foam is a polypropylene foam, and the expansion ratio of the resin foam of centre part is 40, and the expansion ratio of the resin foam of corner assembly is 15.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200510124914XA CN100445134C (en) | 2005-10-09 | 2005-10-09 | Energy absorption device for automobile front beam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200510124914XA CN100445134C (en) | 2005-10-09 | 2005-10-09 | Energy absorption device for automobile front beam |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1944106A CN1944106A (en) | 2007-04-11 |
| CN100445134C true CN100445134C (en) | 2008-12-24 |
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ID=38043832
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB200510124914XA Active CN100445134C (en) | 2005-10-09 | 2005-10-09 | Energy absorption device for automobile front beam |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100445134C (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2373318Y (en) * | 1999-06-08 | 2000-04-12 | 中国船舶工业总公司第七研究院第七二五研究所 | High energy absorption type foam metal beam |
| CN1509239A (en) * | 2001-04-16 | 2004-06-30 | ���չ�˾ | Bumper system with face-mounted energy absorber |
| US6817638B1 (en) * | 2003-06-27 | 2004-11-16 | Hanwha L&C Corporation | Bumper system |
| CN1564763A (en) * | 2001-08-08 | 2005-01-12 | 陶氏环球技术公司 | Energy absorption unit |
| CN1659067A (en) * | 2002-06-06 | 2005-08-24 | 奈特夏普公司 | Bumper with integrated energy absorber and beam |
-
2005
- 2005-10-09 CN CNB200510124914XA patent/CN100445134C/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2373318Y (en) * | 1999-06-08 | 2000-04-12 | 中国船舶工业总公司第七研究院第七二五研究所 | High energy absorption type foam metal beam |
| CN1509239A (en) * | 2001-04-16 | 2004-06-30 | ���չ�˾ | Bumper system with face-mounted energy absorber |
| CN1564763A (en) * | 2001-08-08 | 2005-01-12 | 陶氏环球技术公司 | Energy absorption unit |
| CN1659067A (en) * | 2002-06-06 | 2005-08-24 | 奈特夏普公司 | Bumper with integrated energy absorber and beam |
| US6817638B1 (en) * | 2003-06-27 | 2004-11-16 | Hanwha L&C Corporation | Bumper system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1944106A (en) | 2007-04-11 |
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