JP2004149077A - Shock absorbing body for vehicle - Google Patents

Shock absorbing body for vehicle Download PDF

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Publication number
JP2004149077A
JP2004149077A JP2002319163A JP2002319163A JP2004149077A JP 2004149077 A JP2004149077 A JP 2004149077A JP 2002319163 A JP2002319163 A JP 2002319163A JP 2002319163 A JP2002319163 A JP 2002319163A JP 2004149077 A JP2004149077 A JP 2004149077A
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JP
Japan
Prior art keywords
shock absorber
resin
vehicle
thermoplastic resin
polyolefin
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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.)
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JP2002319163A
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Japanese (ja)
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JP4181630B2 (en
Inventor
Teruo Tamada
輝雄 玉田
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Kyoraku Co Ltd
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Kyoraku Co Ltd
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Priority to JP2002319163A priority Critical patent/JP4181630B2/en
Application filed by Kyoraku Co Ltd filed Critical Kyoraku Co Ltd
Priority to AU2003257809A priority patent/AU2003257809A1/en
Priority to DE60333470T priority patent/DE60333470D1/en
Priority to CA2504485A priority patent/CA2504485C/en
Priority to AT03809840T priority patent/ATE547647T1/en
Priority to AU2003254828A priority patent/AU2003254828A1/en
Priority to EP03809840A priority patent/EP1557582B1/en
Priority to AT03809842T priority patent/ATE475031T1/en
Priority to AU2003254829A priority patent/AU2003254829A1/en
Priority to PCT/JP2003/010012 priority patent/WO2004040162A1/en
Priority to CA2504490A priority patent/CA2504490C/en
Priority to EP03809842A priority patent/EP1557583B1/en
Priority to PCT/JP2003/010011 priority patent/WO2004040161A1/en
Priority to PCT/JP2003/010013 priority patent/WO2004040163A1/en
Priority to US10/698,314 priority patent/US7143876B2/en
Priority to US10/698,537 priority patent/US20040129518A1/en
Priority to US10/698,706 priority patent/US7111713B2/en
Publication of JP2004149077A publication Critical patent/JP2004149077A/en
Priority to US11/130,616 priority patent/US7306080B2/en
Priority to US11/287,984 priority patent/US7178647B2/en
Priority to US11/430,287 priority patent/US7306081B2/en
Publication of JP4181630B2 publication Critical patent/JP4181630B2/en
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Abstract

<P>PROBLEM TO BE SOLVED: To obtain a shock absorbing body for a vehicle having excellent shock absorbing property especially at low temperature. <P>SOLUTION: The shock absorbing body 1 for the vehicle is the one for absorbing the shock from the inside or the outside by internally providing it in the vehicle composition member. The shock absorbing body 1 is a thermoplastic resin made integrally molded by blow-molding. The shock absorbing body for the vehicle 1 has a mainbody 3 having a hollow part, and a pair of recessed ribs 6, 7 which recess an abutting surface 4 and a supporting surface 5 of the mainbody 3 to be opposed with each other toward the other side respectively, and join the respective tip parts. The tip parts of the recessed ribs 6, 7 are joined to make a joining part 8. The shock absorbing body 1 for the vehicle is constituted of thermoplastic resin compounding olefinic elastomer or the like into polyolefinic resin. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は、車両構成部材、例えばドアあるいはボディーサイドパネルに内設することによって搭乗員が車両構成部材の内壁への衝突するような内部または他の車両との衝突のような外部からの衝撃を吸収するための車両用衝撃吸収体に関するものである。
【０００２】
【従来の技術】
この種の車両用衝撃吸収体として、熱可塑性樹脂をブロー成形して中空二重壁構造で中空部を有し、その表面壁と裏面壁から凹状リブを形成してその互いの先端部を接合して一体化し、衝撃吸収性の向上を企図したものは、特開２００２−１８７５０８号公報に記載されている。また、ポリプロピレン樹脂組成物としてポリプロピレン成分およびプロピレンとエチレンとの共重合体成分からなるものは、特開２００２−２０１３２２号公報に記載されている。
【０００３】
【発明が解決しようとする課題】
ところで、上記特開２００２−１８７５０８号公報に示す車両用衝撃吸収体においては、複数の凹状リブ間を一体状につなぐ連結リブを形成するなど、構成に工夫を凝らして衝撃吸収性の向上を図っているが、特に低温時にあっては十分な衝撃吸収性が得られないことが指摘されていた。
【０００４】
そこで、本発明は、ブロー成形によって一体に成形され、かつ凹状リブを形成してなる衝撃吸収体を、ポリオレフィン系樹脂にオレフィン系エラストマー等を配合した熱可塑性樹脂で構成することにより、特に低温時の衝撃吸収性にすぐれた車両用衝撃吸収体を提供することを目的とするものである。
【０００５】
【課題を解決するための手段】
上記目的を達成するため、本発明の請求項１に係る車両用衝撃吸収体は、車両構成部材に内設することによって内部または外部からの衝撃を吸収するための車両用の衝撃吸収体において、衝撃吸収体は、ブロー成形によって一体に成形された熱可塑性樹脂製であって中空部を有する本体と、この本体の互いに対向する当接面および支持面をそれぞれ他方へ向けて窪ませて互いの先端部を接合させた対をなす凹状リブを形成してなり、衝撃吸収体は、ポリオレフィン系樹脂に曲げ弾性率が２０００ｋｇ／ｃｍ２以下の樹脂を配合した熱可塑性樹脂で構成されることを特徴とするものである。
【０００６】
本発明の請求項２に係る車両用衝撃吸収体は、車両構成部材に内設することによって内部または外部からの衝撃を吸収するための車両用の衝撃吸収体において、衝撃吸収体は、ブロー成形によって一体に成形された熱可塑性樹脂製であって中空部を有する本体と、この本体の当接面を対向する支持面方向へ向けて窪ませて先端部を支持面に接合させるか、または支持面を対向する当接面方向へ向けて窪ませて先端部を当接面面に接合させた凹状リブを形成してなり、衝撃吸収体は、ポリオレフィン系樹脂に曲げ弾性率が２０００ｋｇ／ｃｍ２以下の樹脂を配合した熱可塑性樹脂で構成されることを特徴とするものである。
【０００７】
本発明の請求項３に係る車両用衝撃吸収体は、請求項１または２記載の車両用衝撃吸収体において、衝撃吸収体は、ポリオレフィン系樹脂に曲げ弾性率が２００ｋｇ／ｃｍ２以下の樹脂を配合した熱可塑性樹脂で構成されることを特徴とするものである。
【０００８】
本発明の請求項４に係る車両用衝撃吸収体は、請求項１、２または３記載の車両用衝撃吸収体において、衝撃吸収体は、ポリオレフィン系樹脂にオレフィン系エラストマー、スチレン系エラストマー、低密度ポリエチレン、直鎖状低密度ポリエチレン、超低密度ポリエチレン、直鎖状超低密度ポリエチレンからなる群より選ばれる少なくとも１種の樹脂を配合した熱可塑性樹脂で構成されることを特徴とするものである。
【０００９】
本発明の請求項５に係る車両用衝撃吸収体は、請求項１、２、３または４記載の車両用衝撃吸収体において、ポリオレフィン系樹脂がポリエチレン、ポリプロピレンまたはその混合物からなる群より選ばれる少なくとも１種の樹脂からなることを特徴とするものである。
【００１０】
本発明の請求項６に係る車両用衝撃吸収体は、請求項１、２、３、４または５記載の車両用衝撃吸収体において、衝撃吸収体は、ポリオレフィン系樹脂にオレフィン系エラストマーを配合した熱可塑性樹脂で構成され、オレフィン系エラストマーがエチレン−プロピレン共重合体ゴム、エチレン−ブテン共重合体ゴム、プロピレン−ブテン共重合体ゴム、ブタジエン−スチレン共重合体ゴムの水素添加物からなる群より選ばれる少なくとも１種の樹脂からなることを特徴とするものである。
【００１１】
本発明の請求項７に係る車両用衝撃吸収体は、請求項６記載の車両用衝撃吸収体において、オレフィン系エラストマーがポリオレフィン系樹脂に対して３〜２０重量部配合されていることを特徴とするものである。
【００１２】
本発明の請求項８に係る車両用衝撃吸収体は、請求項１、２、３、４、５、６または７記載の車両用衝撃吸収体において、ポリオレフィン系樹脂に配合される樹脂がガラス転移温度または脆化温度がマイナス３０℃以下の熱可塑性樹脂であることを特徴とするものである。
【００１３】
【発明の実施の形態】
図１は本発明の一実施の形態に係る車両用衝撃吸収体の斜視図、図２は図１のＡ−Ａ線拡大断面図、図３は本発明に係る車両用衝撃吸収体を車両のドアパネルに内設した態様を示す断面図、図４は本発明に係る車両用衝撃吸収体を自動車のリヤーピラーに内設した態様を示す断面図、図５は本発明に係る車両用衝撃吸収体を内設したリヤーバンパーの背面図、図６はブロー成形によって得られた車両用衝撃吸収体１を引張り試験機により圧縮し、圧縮荷重に対する変位（圧縮歪の変化）を計測した結果を示すグラフである。
【０００１４】
図１および図２において、１は車両用衝撃吸収体である。この車両用衝撃吸収体１は、ブロー成形によって一体に成形された熱可塑性樹脂製であって中空部２を有する本体３の互いに対向する当接面４および支持面５の両方をそれぞれ他方へ向けて窪ませて形成された対をなす凹状リブ６，７を多数有しており、これら凹状リブ６，７の先端部が互いに当接して接合部８をなしている。
【００１５】
本発明に係る車両用衝撃吸収体１は、凹状リブを、本体３の互いに対向する当接面４を支持面５方向へ向けて窪ませて先端部を支持面５に接合させるか、または支持面５を当接面４方向へ向けて窪ませて先端部を当接面４に接合させた構成とすることができる。なお、この構成については図示していない。
【００１６】
さらに、本発明に係る車両用衝撃吸収体１は、曲げ弾性率が２０００ｋｇ／ｃｍ２以下、特に好ましくは２００ｋｇ／ｃｍ２以下の軟質樹脂をポリオレフィン系樹脂に配合した熱可塑性樹脂により構成される。これにより、衝撃吸収体に設けた凹状リブと軟質樹脂を添加したことによる相乗効果で低温時、特にマイナス３０℃においての衝撃吸収性が良好となる。
【００１７】
ブロー成形によって得られた車両用衝撃吸収体１を引張り試験機により圧縮し、圧縮荷重に対する変位（圧縮歪の変化）を計測した。その結果を図６に示す。図６のグラフに示す曲線（ａ）は、常温時の軟質樹脂を添加しない凹状リブを有する車両用衝撃吸収体１の圧縮荷重に対する変位を示すもので、衝撃吸収体の変位が１５ｍｍを超えたときであっても圧縮荷重が低下することなく高い荷重を支えて衝撃を良好に吸収していることが明らかである。これに対し、グラフに示す曲線（ｃ）は、マイナス３０℃時の軟質樹脂を添加しない凹状リブを有する車両用衝撃吸収体１の圧縮荷重に対する変位を示すもので、衝撃吸収体の変位が１０ｍｍを超えたあたりから圧縮荷重が低下し、良好な衝撃吸収性が得られていないことが明らかである。つまり、低温時の軟質樹脂を添加しない車両用衝撃吸収体１にあっては、凹状リブにおいて脆化破壊が生じ、クラックが形成されることにより所要の衝撃吸収性を得ることができない。
【００１８】
そこで、軟質樹脂を添加することにより、グラフに示す曲線（ｂ）のように低温時にあっても衝撃吸収性を良好とすることができる。グラフに示す曲線（ｂ）は、軟質樹脂を添加した場合のマイナス３０℃における圧縮荷重に対する変位を示すもので、曲線（ｃ）と比較して軟質樹脂を添加したことにより衝撃吸収体の変位が１０ｍｍを超えたあたりからの圧縮荷重の低下が抑制され、良好な衝撃吸収性を示す。つまり、凹状リブを有する車両用衝撃吸収体１をポリプロピレンなどのポリオレフィン系樹脂を基材樹脂とし、３〜２０重量部のオレフィン系エラストマーなどの軟質樹脂を配合した熱可塑性樹脂により構成することで、温度依存性を抑えることができ、マイナス３０℃の低温においても車両用衝撃吸収体１が硬化することなく、衝撃に対して脆化破壊を生じることが防止しされ、好適な衝撃吸収性を得ることができる。また、車両用の衝撃吸収体は、マイナス３０℃における衝撃吸収性が要求されることから、添加される軟質樹脂はガラス転移温度または脆化温度がマイナス３０℃以下であることが必要である。
【００１９】
曲げ弾性率が２０００ｋｇ／ｃｍ２以下の樹脂としては、基材樹脂であるポリオレフィン系樹脂への混合性が良好であることが必要であり、オレフィン系エラストマー、スチレン系エラストマー、低密度ポリエチレン、直鎖状低密度ポリエチレン、超低密度ポリエチレン、直鎖状超低密度ポリエチレンが好適であり、特にオレフィン系エラストマーを基材樹脂であるポリオレフィン系樹脂に対して３〜２０重量部配合することにより良好な衝撃吸収性が得られる。
【００２０】
オレフィン系エラストマーとしては、エチレン−プロピレン共重合体ゴム、エチレン−ブテン共集合体ゴム、プロピレン−ブテン共集合体ゴム、ブタジエン−スチレン共集合体ゴムの水素添加物など、スチレン系エラストマーとしては、スチレン−ブタジエンブロック共重合体、スチレン−ブタジエン−スチレンブロック共重合体、スチレン−イソプレンブロック共重合体、スチレン−イソプレン−スチレンブロック共重合体、及びこれらの水素添加物などが好適に使用される。これらのエラストマーはポリオレフィン系樹脂に対して混合性が良好である。
【００２１】
本発明に係る車両用衝撃吸収体１は、自動車等のドア、ボディサイドパネル、ルーフパネル、ピラー、バンパーなどに内設される。図３にはドア９のドアトリム１０に、図４は自動車のリヤピラー１１に、図５はリヤーバンパー１２に、それぞれ本発明に係る車両用衝撃吸収体１を内設した例を示している。図４においてＡは乗車者の頭部を示している。
【００２２】
【発明の効果】
本発明によれば、ブロー成形によって一体に成形され、かつ凹状リブを形成してなる衝撃吸収体を、ポリオレフィン系樹脂にオレフィン系エラストマーを配合した熱可塑性樹脂で構成することにより、特に低温時の衝撃吸収性にすぐれた車両用衝撃吸収体を得ることができる。
【図面の簡単な説明】
【図１】本発明の一実施の形態に係る車両用衝撃吸収体の斜視図である。
【図２】図１のＡ−Ａ線拡大断面図である。
【図３】本発明に係る車両用衝撃吸収体を自動車のドアに内設した態様を示す断面図である。
【図４】本発明に係る車両用衝撃吸収体を自動車のリヤピラーに内設した態様を示す断面図である。
【図５】本発明に係る車両用衝撃吸収体を内設したリヤーバンパーの背面図である。
【図６】ブロー成形によって得られた車両用衝撃吸収体１を引張り試験機により圧縮し、圧縮荷重に対する変位（圧縮歪の変化）を計測した結果を示すグラフである。
【符号の説明】
１ 車両用衝撃吸収体
２ 中空部
３ 本体
４ 当接面
５ 支持面
６，７ 凹状リブ
８ 接合部
９ ドア
１０ ドアトリム
１１ リヤピラー
１２ リヤーバンパー
Ａ 頭部[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention provides a vehicle component, for example, a door or a body side panel, in which an occupant receives an internal impact such as a collision with an inner wall of the vehicle component or an external impact such as a collision with another vehicle. The present invention relates to a vehicle shock absorber for absorbing.
[0002]
[Prior art]
As this type of vehicle shock absorber, thermoplastic resin is blow molded to form a hollow double-walled structure and has a hollow portion, and a concave rib is formed from the front wall and the rear wall, and the tips of the two are joined together Japanese Patent Application Laid-Open No. 2002-187508 describes an integrated structure for improving the shock absorption. Further, a polypropylene resin composition comprising a polypropylene component and a copolymer component of propylene and ethylene is described in JP-A-2002-201322.
[0003]
[Problems to be solved by the invention]
By the way, in the vehicle shock absorber disclosed in Japanese Patent Application Laid-Open No. 2002-187508, the structure is devised to improve the shock absorption by forming a connecting rib integrally connecting a plurality of concave ribs. However, it has been pointed out that sufficient impact absorption cannot be obtained, especially at low temperatures.
[0004]
In view of the above, the present invention provides a shock absorber formed integrally by blow molding and having a concave rib formed of a thermoplastic resin obtained by blending an olefin elastomer or the like with a polyolefin resin, particularly at low temperatures. It is an object of the present invention to provide a vehicle shock absorber excellent in shock absorption.
[0005]
[Means for Solving the Problems]
To achieve the above object, a shock absorber for a vehicle according to claim 1 of the present invention is a shock absorber for a vehicle for absorbing a shock from inside or outside by being provided inside a vehicle constituent member, The shock absorber is made of a thermoplastic resin integrally formed by blow molding and has a hollow body, and a mutually opposing contact surface and support surface of the main body are depressed toward the other, and the shock absorber is mutually depressed. A pair of concave ribs with their ends joined are formed, and the shock absorber is made of a thermoplastic resin obtained by blending a polyolefin resin with a resin having a flexural modulus of 2000 kg / cm 2 or less. It is assumed that.
[0006]
A shock absorber for a vehicle according to claim 2 of the present invention is a shock absorber for a vehicle for absorbing a shock from inside or outside by being provided inside a vehicle constituent member, wherein the shock absorber is blow molded. A body made of a thermoplastic resin integrally formed by the above and having a hollow portion, and a contact surface of the body is depressed toward a facing support surface so that a tip portion is joined to the support surface, or The impact absorber has a flexural modulus of 2000 kg / cm 2 of a polyolefin-based resin formed by forming a concave rib in which the surface is depressed in the direction of the opposing abutting surface and the tip is joined to the abutting surface. It is characterized by being composed of a thermoplastic resin containing the following resins.
[0007]
The shock absorber for a vehicle according to claim 3 of the present invention is the shock absorber for a vehicle according to claim 1 or 2, wherein the shock absorber is made of a polyolefin resin and a resin having a flexural modulus of 200 kg / cm 2 or less. It is characterized by being composed of a blended thermoplastic resin.
[0008]
The shock absorber for vehicles according to claim 4 of the present invention is the shock absorber for vehicles according to claim 1, 2 or 3, wherein the shock absorber is an olefin elastomer, a styrene elastomer, a low-density polyolefin resin. It is characterized by being composed of a thermoplastic resin containing at least one resin selected from the group consisting of polyethylene, linear low-density polyethylene, ultra-low-density polyethylene, and linear ultra-low-density polyethylene. .
[0009]
The vehicle shock absorber according to claim 5 of the present invention is the vehicle shock absorber according to claim 1, 2, 3 or 4, wherein the polyolefin resin is at least selected from the group consisting of polyethylene, polypropylene or a mixture thereof. It is characterized by being made of one kind of resin.
[0010]
The vehicle shock absorber according to claim 6 of the present invention is the vehicle shock absorber according to claim 1, 2, 3, 4 or 5, wherein the shock absorber comprises a polyolefin-based resin and an olefin-based elastomer. Composed of a thermoplastic resin, the olefin-based elastomer is a group consisting of hydrogenated ethylene-propylene copolymer rubber, ethylene-butene copolymer rubber, propylene-butene copolymer rubber, and butadiene-styrene copolymer rubber. It is characterized by being made of at least one selected resin.
[0011]
A vehicle shock absorber according to claim 7 of the present invention is characterized in that, in the vehicle shock absorber according to claim 6, 3 to 20 parts by weight of the olefin elastomer is blended with respect to the polyolefin resin. Is what you do.
[0012]
The shock absorber for vehicles according to claim 8 of the present invention is the shock absorber for vehicles according to claim 1, 2, 3, 4, 5, 6, or 7, wherein the resin blended with the polyolefin resin has a glass transition. It is a thermoplastic resin having a temperature or an embrittlement temperature of not more than -30 ° C.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a perspective view of a vehicle shock absorber according to an embodiment of the present invention, FIG. 2 is an enlarged sectional view taken along line AA of FIG. 1, and FIG. FIG. 4 is a cross-sectional view illustrating a mode in which the vehicle shock absorber according to the present invention is installed in a rear pillar of an automobile, and FIG. 5 is a cross-sectional view illustrating a mode in which the vehicle shock absorber according to the present invention is installed in a rear pillar. FIG. 6 is a graph showing the results of measuring the displacement (change in compressive strain) with respect to a compressive load by compressing a vehicle shock absorber 1 obtained by blow molding using a tensile tester and measuring the displacement (compression strain). is there.
[00014]
1 and 2, reference numeral 1 denotes a vehicle shock absorber. This shock absorber 1 for a vehicle is made of a thermoplastic resin integrally formed by blow molding and has both a contact surface 4 and a support surface 5 of a body 3 having a hollow portion 2 facing each other facing the other. The ribs 6 and 7 have a large number of pairs of concave ribs 6 and 7 formed by being depressed. The distal ends of the concave ribs 6 and 7 are in contact with each other to form a joint 8.
[0015]
In the shock absorber for a vehicle 1 according to the present invention, the concave ribs are depressed so that the abutting surfaces 4 of the main body 3 facing each other are directed toward the support surface 5, and the leading end is joined to the support surface 5, or the support is supported. A configuration in which the surface 5 is depressed toward the contact surface 4 and the leading end is joined to the contact surface 4 can be adopted. This configuration is not shown.
[0016]
Further, the shock absorber 1 for a vehicle according to the present invention is made of a thermoplastic resin obtained by blending a soft resin having a flexural modulus of 2000 kg / cm 2 or less, particularly preferably 200 kg / cm 2 or less, with a polyolefin-based resin. Thereby, the shock absorption at low temperature, especially at minus 30 ° C. is improved due to the synergistic effect of the addition of the concave rib provided on the shock absorber and the soft resin.
[0017]
The vehicle shock absorber 1 obtained by blow molding was compressed by a tensile tester, and displacement (change in compressive strain) with respect to a compressive load was measured. FIG. 6 shows the result. The curve (a) shown in the graph of FIG. 6 shows the displacement with respect to the compressive load of the vehicle shock absorber 1 having the concave rib without the addition of the soft resin at normal temperature, and the displacement of the shock absorber exceeded 15 mm. It is clear that even at this time, the impact is favorably absorbed while supporting a high load without a decrease in the compressive load. On the other hand, the curve (c) shown in the graph shows the displacement of the vehicle shock absorber 1 having the concave ribs to which the soft resin was not added at −30 ° C. with respect to the compressive load, and the displacement of the shock absorber was 10 mm. It is apparent that the compression load was reduced from around the point where exceeded, and good impact absorption was not obtained. That is, in the shock absorber 1 for a vehicle to which a soft resin is not added at a low temperature, embrittlement fracture occurs in the concave ribs and cracks are formed, so that it is not possible to obtain required shock absorption.
[0018]
Therefore, by adding a soft resin, it is possible to improve the shock absorption even at a low temperature as shown by a curve (b) in the graph. The curve (b) shown in the graph shows the displacement with respect to the compressive load at −30 ° C. when the soft resin was added, and the displacement of the shock absorber due to the addition of the soft resin was lower than that of the curve (c). A decrease in compression load from around 10 mm is suppressed, and good shock absorption is exhibited. In other words, the vehicle shock absorber 1 having the concave rib is made of a thermoplastic resin in which a polyolefin resin such as polypropylene is used as a base resin and 3 to 20 parts by weight of a soft resin such as an olefin elastomer is blended. Temperature dependency can be suppressed, and even at a low temperature of -30 ° C., the vehicle shock absorber 1 is not hardened, and it is possible to prevent the embrittlement fracture from being caused by an impact and to obtain a suitable shock absorbing property. be able to. Further, since a shock absorber for vehicles is required to have a shock absorbing property at -30 ° C, the soft resin to be added must have a glass transition temperature or an embrittlement temperature of -30 ° C or less.
[0019]
The resin having a flexural modulus of 2000 kg / cm 2 or less needs to have good mixing properties with the polyolefin-based resin as the base resin, and may be an olefin-based elastomer, a styrene-based elastomer, a low-density polyethylene, a linear Low-density polyethylene, ultra-low-density polyethylene, and linear ultra-low-density polyethylene are preferred. Particularly, good impact can be obtained by blending 3 to 20 parts by weight of an olefin elastomer with a polyolefin resin as a base resin. Absorbency is obtained.
[0020]
Examples of olefin elastomers include ethylene-propylene copolymer rubber, ethylene-butene copolymer rubber, propylene-butene copolymer rubber, and hydrogenated products of butadiene-styrene copolymer rubber. -Butadiene block copolymer, styrene-butadiene-styrene block copolymer, styrene-isoprene block copolymer, styrene-isoprene-styrene block copolymer, hydrogenated products thereof and the like are preferably used. These elastomers have good mixing properties with polyolefin resins.
[0021]
The vehicle shock absorber 1 according to the present invention is installed in a door, a body side panel, a roof panel, a pillar, a bumper, or the like of an automobile or the like. 3 shows an example in which the vehicle shock absorber 1 according to the present invention is installed in the door trim 10 of the door 9, in FIG. 4 in the rear pillar 11 of the automobile, and in FIG. 5 in the rear bumper 12, respectively. In FIG. 4, A indicates the head of the occupant.
[0022]
【The invention's effect】
According to the present invention, by forming the shock absorber formed integrally with blow molding and forming the concave ribs from a thermoplastic resin in which an olefin elastomer is blended with a polyolefin resin, particularly at a low temperature. It is possible to obtain a vehicle shock absorber excellent in shock absorption.
[Brief description of the drawings]
FIG. 1 is a perspective view of a vehicle shock absorber according to an embodiment of the present invention.
FIG. 2 is an enlarged sectional view taken along line AA of FIG.
FIG. 3 is a cross-sectional view showing a mode in which the vehicular shock absorber according to the present invention is installed in a door of an automobile.
FIG. 4 is a cross-sectional view showing a mode in which the vehicle shock absorber according to the present invention is installed in a rear pillar of an automobile.
FIG. 5 is a rear view of a rear bumper provided with the vehicle shock absorber according to the present invention.
FIG. 6 is a graph showing a result obtained by compressing a vehicle shock absorber 1 obtained by blow molding with a tensile tester and measuring displacement (change in compressive strain) with respect to a compressive load.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Shock absorber 2 for vehicle 2 Hollow part 3 Main body 4 Contact surface 5 Support surface 6, 7 Concave rib 8 Joint 9 Door 10 Door trim 11 Rear pillar 12 Rear bumper A Head

Claims (8)

車両構成部材に内設することによって内部または外部からの衝撃を吸収するための車両用の衝撃吸収体において、
衝撃吸収体は、ブロー成形によって一体に成形された熱可塑性樹脂製であって中空部を有する本体と、この本体の互いに対向する当接面および支持面をそれぞれ他方へ向けて窪ませて互いの先端部を接合させた対をなす凹状リブを形成してなり、
衝撃吸収体は、ポリオレフィン系樹脂に曲げ弾性率が２０００ｋｇ／ｃｍ２以下の樹脂を配合した熱可塑性樹脂で構成される
ことを特徴とする車両用衝撃吸収体。In a vehicle shock absorber for absorbing internal or external impact by being provided in a vehicle component,
The shock absorber is made of a thermoplastic resin integrally formed by blow molding and has a hollow body, and a mutually opposing contact surface and support surface of the main body are depressed toward the other, and the shock absorber is mutually depressed. Forming a pair of concave ribs with their tips joined,
A shock absorber for a vehicle, wherein the shock absorber is made of a thermoplastic resin in which a resin having a flexural modulus of 2000 kg / cm 2 or less is mixed with a polyolefin resin. 車両構成部材に内設することによって内部または外部からの衝撃を吸収するための車両用の衝撃吸収体において、
衝撃吸収体は、ブロー成形によって一体に成形された熱可塑性樹脂製であって中空部を有する本体と、この本体の当接面を対向する支持面方向へ向けて窪ませて先端部を支持面に接合させるか、または支持面を対向する当接面方向へ向けて窪ませて先端部を当接面面に接合させた凹状リブを形成してなり、
衝撃吸収体は、ポリオレフィン系樹脂に曲げ弾性率が２０００ｋｇ／ｃｍ２以下の樹脂を配合した熱可塑性樹脂で構成される
ことを特徴とする車両用衝撃吸収体。In a vehicle shock absorber for absorbing internal or external impact by being provided in a vehicle component,
The shock absorber is made of a thermoplastic resin integrally formed by blow molding and has a hollow body, and a contact surface of the main body is depressed toward a facing support surface so that a front end portion is a support surface. Or to form a concave rib in which the front end is joined to the contact surface by recessing the support surface toward the opposite contact surface,
A shock absorber for a vehicle, wherein the shock absorber is made of a thermoplastic resin in which a resin having a flexural modulus of 2000 kg / cm 2 or less is mixed with a polyolefin resin. 衝撃吸収体は、ポリオレフィン系樹脂に曲げ弾性率が２００ｋｇ／ｃｍ２以下の樹脂を配合した熱可塑性樹脂で構成されることを特徴とする請求項１または２記載の車両用衝撃吸収体。3. The shock absorber for a vehicle according to claim 1, wherein the shock absorber is made of a thermoplastic resin obtained by mixing a resin having a flexural modulus of 200 kg / cm 2 or less with a polyolefin resin. 衝撃吸収体は、ポリオレフィン系樹脂にオレフィン系エラストマー、スチレン系エラストマー、低密度ポリエチレン、直鎖状低密度ポリエチレン、超低密度ポリエチレン、直鎖状超低密度ポリエチレンからなる群より選ばれる少なくとも１種の樹脂を配合した熱可塑性樹脂で構成されることを特徴とする請求項１、２または３記載の車両用衝撃吸収体。The shock absorber is a polyolefin-based resin, olefin-based elastomer, styrene-based elastomer, low-density polyethylene, linear low-density polyethylene, ultra-low-density polyethylene, linear ultra-low-density polyethylene, at least one selected from the group consisting of 4. The shock absorber for a vehicle according to claim 1, wherein the shock absorber is made of a thermoplastic resin mixed with a resin. ポリオレフィン系樹脂がポリエチレン、ポリプロピレンまたはその混合物からなる群より選ばれる少なくとも１種の樹脂からなることを特徴とする請求項１、２、３または４記載の車両用衝撃吸収体。5. The shock absorber for a vehicle according to claim 1, wherein the polyolefin resin is at least one resin selected from the group consisting of polyethylene, polypropylene and a mixture thereof. 衝撃吸収体は、ポリオレフィン系樹脂にオレフィン系エラストマーを配合した熱可塑性樹脂で構成され、オレフィン系エラストマーがエチレン−プロピレン共重合体ゴム、エチレン−ブテン共重合体ゴム、プロピレン−ブテン共重合体ゴム、ブタジエン−スチレン共重合体ゴムの水素添加物からなる群より選ばれる少なくとも１種の樹脂からなることを特徴とする請求項１、２、３、４または５記載の車両用衝撃吸収体。The shock absorber is composed of a thermoplastic resin obtained by blending an olefin elastomer with a polyolefin resin, wherein the olefin elastomer is ethylene-propylene copolymer rubber, ethylene-butene copolymer rubber, propylene-butene copolymer rubber, 6. The vehicle shock absorber according to claim 1, comprising at least one resin selected from the group consisting of hydrogenated butadiene-styrene copolymer rubbers. オレフィン系エラストマーがポリオレフィン系樹脂に対して３〜２０重量部配合されていることを特徴とする請求項６記載の車両用衝撃吸収体。7. The shock absorber for a vehicle according to claim 6, wherein the olefin elastomer is mixed in an amount of 3 to 20 parts by weight based on the polyolefin resin. ポリオレフィン系樹脂に配合される樹脂がガラス転移温度または脆化温度がマイナス３０℃以下の熱可塑性樹脂であることを特徴とする請求項１、２、３、４、５、６または７記載の車両用衝撃吸収体。8. The vehicle according to claim 1, wherein the resin mixed with the polyolefin resin is a thermoplastic resin having a glass transition temperature or an embrittlement temperature of -30 ° C. or less. For shock absorber.
JP2002319163A 2002-10-31 2002-10-31 Shock absorber for vehicle Expired - Fee Related JP4181630B2 (en)

Priority Applications (20)

Application Number Priority Date Filing Date Title
JP2002319163A JP4181630B2 (en) 2002-10-31 2002-10-31 Shock absorber for vehicle
PCT/JP2003/010011 WO2004040161A1 (en) 2002-10-31 2003-08-06 Impact absorbing body for vehicle
CA2504485A CA2504485C (en) 2002-10-31 2003-08-06 Impact absorbing member for vehicle
AT03809840T ATE547647T1 (en) 2002-10-31 2003-08-06 SHOCK ABSORPTION BODY FOR VEHICLES
AU2003254828A AU2003254828A1 (en) 2002-10-31 2003-08-06 Impact absorbing body for vehicle
EP03809840A EP1557582B1 (en) 2002-10-31 2003-08-06 Impact absorbing body for vehicle
AT03809842T ATE475031T1 (en) 2002-10-31 2003-08-06 SHOCK ABSORBER FOR VEHICLE
AU2003254829A AU2003254829A1 (en) 2002-10-31 2003-08-06 Shock absorber for vehicle
PCT/JP2003/010012 WO2004040162A1 (en) 2002-10-31 2003-08-06 Impact absorbing body for vehicle
CA2504490A CA2504490C (en) 2002-10-31 2003-08-06 Impact absorbing member for vehicle
AU2003257809A AU2003257809A1 (en) 2002-10-31 2003-08-06 Impact absorbing body for vehicle
EP03809842A EP1557583B1 (en) 2002-10-31 2003-08-06 Shock absorber for vehicle
PCT/JP2003/010013 WO2004040163A1 (en) 2002-10-31 2003-08-06 Shock absorber for vehicle
DE60333470T DE60333470D1 (en) 2002-10-31 2003-08-06 SHOCK ABSORBER FOR VEHICLE
US10/698,537 US20040129518A1 (en) 2002-10-31 2003-10-31 Impact absorbing member for vehicle
US10/698,706 US7111713B2 (en) 2002-10-31 2003-10-31 Impact absorbing member for vehicle
US10/698,314 US7143876B2 (en) 2002-10-31 2003-10-31 Impact absorbing member for vehicle
US11/130,616 US7306080B2 (en) 2002-10-31 2005-05-17 Impact absorbing member for vehicle
US11/287,984 US7178647B2 (en) 2002-10-31 2005-11-28 Impact absorbing member for vehicle
US11/430,287 US7306081B2 (en) 2002-10-31 2006-05-08 Impact absorbing member for vehicle

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009179128A (en) * 2008-01-30 2009-08-13 Denso Corp Pedestrian collision sensing device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009179128A (en) * 2008-01-30 2009-08-13 Denso Corp Pedestrian collision sensing device

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