JP2005153567A - Shock absorbing member - Google Patents

Shock absorbing member Download PDF

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JP2005153567A
JP2005153567A JP2003391207A JP2003391207A JP2005153567A JP 2005153567 A JP2005153567 A JP 2005153567A JP 2003391207 A JP2003391207 A JP 2003391207A JP 2003391207 A JP2003391207 A JP 2003391207A JP 2005153567 A JP2005153567 A JP 2005153567A
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absorbing member
metal body
cylindrical metal
impact
impact absorbing
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Jun Kitagawa
隼 北川
Koichi Hiramatsu
浩一 平松
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Toyota Motor Corp
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Toyota Motor Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensively and easily manufacturable shock absorbing member for reducing an initial impact load, and forming a continuous collapse form. <P>SOLUTION: This shock absorbing member absorbs collision energy by collapsing a cylindrical metallic body by receiving the impact load in the axial direction of the cylindrical metallic body, and has a cutout forming a starting point for cleaving the cylindrical metallic body in a tip peripheral edge part of the cylindrical metallic body. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、衝突時の衝撃を圧潰することによって吸収または緩和する衝撃吸収部材に関する。   The present invention relates to an impact absorbing member that absorbs or relaxes by collapsing the impact at the time of collision.

自動車の車体前部の両サイドには、フロントサイドメンバと呼ばれる閉断面構造の衝撃吸収部材が設けられ、正面からの衝突時に効率よく圧潰して衝突のエネルギを吸収または緩和して乗員の安全を確保する構造となっている。   On both sides of the front part of the car body, shock absorbing members with a closed cross-sectional structure called front side members are provided, which are efficiently crushed at the time of a collision from the front to absorb or mitigate the energy of the collision, thereby improving passenger safety It has a structure to secure.

例えば、図１２に示すような円筒状または角筒状の中空な金属体３０の側面にクラッシュビード３１を形成したものが知られている。このような衝撃吸収部材では、その筒状金属体の軸方向（想定衝突方向）に衝突荷重Ｆを受けたときに、この筒状金属体３０を蛇腹状に圧潰させることで衝突時のエネルギを吸収している。   For example, there is known a structure in which a crash bead 31 is formed on a side surface of a hollow cylindrical or square cylindrical metal body 30 as shown in FIG. In such an impact absorbing member, when a collision load F is received in the axial direction (assumed collision direction) of the cylindrical metal body, the cylindrical metal body 30 is crushed in a bellows shape to thereby save energy at the time of collision. Absorbs.

しかしながら、上記のような筒状金属体３０では、ビード３１間の側壁部分３２はビード部３１に比較して相対的にエネルギ吸収に対する寄与度が小さく、また、蛇腹状の断続的な圧潰（以下、蛇腹圧潰という）によって衝撃エネルギを吸収する。従って、衝突時には、荷重を受けた端部側から順次部分的に蛇腹圧潰せざるを得ないために、衝突時のＦ−Ｓ特性は不安定なものとなる。図１１に蛇腹圧潰の圧潰挙動を示すＦ−Ｓ線図を模式的に示した。縦軸は衝撃荷重Ｆ、横軸は圧潰ストロークＳであり、Ｆ−Ｓ曲線と横軸とで囲まれた面積がこの衝撃吸収部材の吸収エネルギ量である。   However, in the cylindrical metal body 30 as described above, the side wall portion 32 between the beads 31 has a relatively small contribution to energy absorption compared to the bead portion 31, and the bellows-like intermittent crushing (hereinafter referred to as the bellows-shaped metal body 30). Absorbs impact energy by crushing bellows). Accordingly, at the time of a collision, the bellows must be partially crushed sequentially from the end side receiving the load, so that the FS characteristic at the time of the collision becomes unstable. FIG. 11 schematically shows an FS diagram showing the crushing behavior of bellows crushing. The vertical axis represents the impact load F, the horizontal axis represents the crushing stroke S, and the area surrounded by the FS curve and the horizontal axis is the amount of energy absorbed by the impact absorbing member.

図１１のような蛇腹圧潰においては、最初に蛇腹が生成されるときの衝撃力のピーク値Ｆｉ（初期衝撃荷重）が、これに引き続いて生じる蛇腹の連続生成過程で作用する衝撃力の平均的な値に比べて著しく大きく、衝撃発生時点の初期段階で搭乗者に大きな衝撃が作用するといった問題がある。   In the bellows crushing as shown in FIG. 11, the peak value Fi (initial impact load) of the impact force when the bellows is first generated is an average of the impact force that acts in the subsequent continuous bellows generation process. There is a problem that a large impact acts on the occupant in the initial stage of the impact occurrence.

また、Ｆ−Ｓ線図が脈動的な不安定な挙動を示し、エネルギ吸収量のばらつきも大きく、設計時のコンピュータによる予測（以下，ＣＡＥ解析という）が困難であるという問題もあった。   In addition, the FS diagram shows a pulsating and unstable behavior, and there is a large variation in the amount of energy absorption, which makes it difficult to predict by computer (hereinafter referred to as CAE analysis) at the time of design.

図４に衝撃吸収部材に求められる理想特性を示す。エネルギ吸収量が多いことは勿論だが、Ｆ−Ｓ線図でストロークＳに対する荷重Ｆの変化が極力フラットであること、すなわち、Ｆ−Ｓ線図が脈動的な傾向を示さず、滑らかな曲線的な挙動を示すことが望ましい。この様な特性を持つ衝撃吸収部材であれば、実際の圧潰挙動をＣＡＥ解析などを用いて精度よく予測することが可能となり、所望の特性に合わせた適切な衝撃吸収部材を設計することができる。   FIG. 4 shows ideal characteristics required for the shock absorbing member. Of course, the amount of energy absorption is large, but in the FS diagram, the change in the load F with respect to the stroke S is as flat as possible, that is, the FS diagram does not show a pulsating tendency and is smooth and curved. It is desirable to show a good behavior. With an impact absorbing member having such characteristics, it is possible to accurately predict the actual crushing behavior using CAE analysis and the like, and it is possible to design an appropriate impact absorbing member that matches the desired characteristics. .

上記のような滑らかで連続的な圧潰（以下、連続圧潰という）挙動を示す衝撃吸収部材として、衝撃吸収時の変形が無限変形軌道を描く構造を有する衝撃吸収部材が提案されている（特許文献１参照）。この衝撃吸収部材は衝突により無限変形軌道を描くように変形するので、部材の全ての部分がエネルギ吸収に寄与することができる。また、変形が断続的ではなく連続的となるため、Ｆ−Ｓ線図は理想的なものとなる。すなわち、圧潰挙動の安定化と吸収エネルギ量の安定化を図ることができるので、ＣＡＥ解析などともよく整合した理想的な衝撃吸収部材となる。   As an impact absorbing member that exhibits a smooth and continuous crushing behavior (hereinafter referred to as “continuous crushing”) as described above, an impact absorbing member having a structure in which deformation upon impact absorption draws an infinite deformation trajectory has been proposed (Patent Literature). 1). Since the impact absorbing member is deformed so as to draw an infinitely deformed trajectory by the collision, all parts of the member can contribute to energy absorption. Also, since the deformation is continuous rather than intermittent, the FS diagram is ideal. That is, since the crushing behavior and the amount of absorbed energy can be stabilized, an ideal shock absorbing member that is well matched with the CAE analysis and the like can be obtained.

しかし、この従来技術になる衝撃吸収部材は、その構造が複雑であるために製造が困難であること、あるいは工程が多くコストが高いという問題がある。また、部材長さの半分しか有効ストロークとして使用することができないため、スペースの制約の大きい自動車用の衝撃吸収部材としては不向きな構造である。
特開２００３−４００５８号公報 However, the impact absorbing member according to the prior art has a problem that it is difficult to manufacture due to its complicated structure, or there are many steps and high cost. Further, since only half of the length of the member can be used as an effective stroke, the structure is unsuitable as an impact absorbing member for automobiles with large space constraints.
Japanese Patent Laid-Open No. 2003-40058

本発明は以上の点に鑑みてなされたもので、初期衝撃荷重が小さく連続圧潰形態となる安価で容易に製造できる衝撃吸収部材を提供することである。   The present invention has been made in view of the above points, and it is an object of the present invention to provide an impact absorbing member that has a small initial impact load and can be easily manufactured at a low cost in a continuous crushing configuration.

本発明の衝撃吸収部材は、上記の目的を達成するために、筒状金属体の軸方向に衝撃荷重を受けて、該筒状金属体が圧潰することで衝突エネルギを吸収する衝撃吸収部材であって、該筒状金属体の先端周縁部に該筒状金属体が裂開する起点となる切欠を有することを特徴とする。   In order to achieve the above object, the impact absorbing member of the present invention is an impact absorbing member that receives an impact load in the axial direction of the cylindrical metal body and absorbs collision energy by crushing the cylindrical metal body. And it has the notch used as the starting point which this cylindrical metal body tears in the front-end | tip peripheral part of this cylindrical metal body, It is characterized by the above-mentioned.

筒状金属体の先端周縁部に切欠を設けることにより、筒状金属体の側面先端部は衝突と同時に外側に曲げられる。そして、その周縁部に形成されている切欠を起点として、隣り合う外側面が剪断されて筒状金属体の裂開が進行する。従って、高い初期衝撃荷重を示すことなく連続圧潰状態を維持しながら変形することで、安定して衝撃エネルギを吸収することができる。   By providing a notch in the peripheral edge of the tip of the cylindrical metal body, the side tip of the cylindrical metal body is bent outward simultaneously with the collision. Then, with the notch formed in the peripheral edge as a starting point, the adjacent outer surfaces are sheared and the cleaving of the cylindrical metal body proceeds. Therefore, the impact energy can be absorbed stably by deforming while maintaining a continuous crushing state without exhibiting a high initial impact load.

本発明の衝撃吸収部材は、前記筒状金属体の裂開を途中で停止させる停止手段を有することが望ましい。   The impact absorbing member of the present invention preferably has a stopping means for stopping the tearing of the cylindrical metal body halfway.

衝突によって生じる筒状金属体の裂開を途中で停止させる停止手段を有し、その停止位置を任意に選択することにより吸収エネルギ量の調整や設置領域内の重要部品や重要部材の破損を防御することができる。   There is a stopping means to stop the tearing of the cylindrical metal body caused by the collision, and by selecting the stopping position arbitrarily, the amount of energy absorbed can be adjusted and damage to important parts and important members in the installation area can be prevented can do.

裂開の進行を停止させる停止手段としては、筒状金属体の後端側を嵌入させて接合した外側部材、前記筒状金属体の側部に前記軸方向に直角に穿設されているスリット、あるは前記筒状金属体の側部に前記軸方向に直角に設けた凸部であることが好ましい。   As stopping means for stopping the progress of dehiscence, an outer member joined by fitting the rear end side of the cylindrical metal body, a slit formed at a right angle in the axial direction on the side portion of the cylindrical metal body It is preferable that the convex portions are provided on the side portions of the cylindrical metal body at right angles to the axial direction.

また、本発明の衝撃吸収部材は、前記筒状金属体の側部に前記軸方向に平行に吸収エネルギを増大させる補強手段を有することができる。   In addition, the impact absorbing member of the present invention can have reinforcing means for increasing the absorbed energy in parallel to the axial direction at the side portion of the cylindrical metal body.

筒状金属体の側部にリブや棒状または板状などの強度部材を有することでその部分の衝撃吸収エネルギを増大させることができる。   By having a strength member such as a rib, bar, or plate at the side of the cylindrical metal body, the impact absorption energy of that portion can be increased.

図１に本発明の衝撃吸収部材の一実施の形態を斜視図で示す。本形態の衝撃吸収部材１０は、断面が四角形の筒状金属体１１であり、筒状金属体１１の先端Ａの周縁部の各角部に切欠１２を有している。   FIG. 1 is a perspective view showing an embodiment of an impact absorbing member of the present invention. The shock absorbing member 10 of this embodiment is a cylindrical metal body 11 having a rectangular cross section, and has notches 12 at each corner of the peripheral edge of the tip A of the cylindrical metal body 11.

筒状金属体１１の材質は特に規定しないが、鉄、アルミニウム、チタン、銅、およびそれらの合金などを採用できる。特に、鉄およびその合金については従来技術でも一般的に用いられており、多様で安定した品質のものを容易に得ることができるので好適である。例えば、ステンレス鋼などの合金鋼、炭素鋼、あるいは純鉄でもよく、亜共析鋼、共析鋼、過共析鋼でもよい。また、それらの組織についても特に制約はなく、フェライト−パーライトの混合組織、あるいはフェライト、オーステナイト、ベイナイト、ソルバイトなどの単一組織であってもよい。   The material of the cylindrical metal body 11 is not particularly limited, but iron, aluminum, titanium, copper, and alloys thereof can be employed. In particular, iron and its alloys are generally used in the prior art, and are suitable because various and stable quality can be easily obtained. For example, alloy steel such as stainless steel, carbon steel, or pure iron may be used, and hypoeutectoid steel, eutectoid steel, or hypereutectoid steel may be used. Moreover, there is no restriction | limiting in particular also about those structures, Single structure | tissues, such as a mixed structure of a ferrite-pearlite, or a ferrite, austenite, bainite, sorbite, may be sufficient.

また、筒状金属体の断面形状は、四角形に限定されることなく、円形や楕円形などの閉曲面、あるいは三角形以上の多角形などとすることができる。   The cross-sectional shape of the cylindrical metal body is not limited to a quadrangle, and may be a closed curved surface such as a circle or an ellipse, or a polygon more than a triangle.

切欠の形状や切欠の位置についても特に制約はないが、筒状金属体の断面形状が多角形の場合には、各角部に切欠を設けることが好ましい。   The shape of the notch and the position of the notch are not particularly limited, but when the cross-sectional shape of the cylindrical metal body is a polygon, it is preferable to provide a notch at each corner.

本発明の衝撃吸収部材の成形方法は特に規定しないが、例えば、ハイドロフォーム、押出し成形、プレス成形品を溶接したものなど、公知の方法で形成された筒状金属体の所定の部分に、レーザ加工、切削加工、あるいはプレス打ち抜きなどの公知の方法で切欠を形成して所望の衝撃吸収部材とすることができる。   The method for forming the impact absorbing member of the present invention is not particularly defined. For example, a laser is applied to a predetermined portion of a cylindrical metal body formed by a known method such as a hydroformed, extruded, or press-formed product. A notch can be formed by a known method such as machining, cutting, or press punching to obtain a desired impact absorbing member.

次に、本実施形態における衝撃吸収部材の作用について図２〜４を参照しながら説明する。   Next, the effect | action of the impact-absorbing member in this embodiment is demonstrated, referring FIGS.

図２（ａ）は衝撃吸収部材１０に対してほぼ想定通りの方向（軸心に平行）から衝撃荷重Ｆが加わる直前の状態を示す。衝撃荷重Ｆは衝撃吸収部材１０の先端面Ｓに垂直に作用するので、衝撃吸収部材１０の前後両端に圧縮力が働き、この力に基づいて、図２（ｂ）のように筒状金属体１１の側部の先端部分１３が外側に向かってめくれるように曲げ変形される。これは、図４の実線で示すＦ−Ｓ線図で、直線的に荷重が増加する（イ）の部分に相当する。当初形成された切欠１２は先端部分１３の曲げ変形によって隣り合う側部の稜線１４に沿って進行し、筒状金属体１１の裂開が開始される。図４においては荷重が曲線的に増加する（ロ）の範囲に相当する。   FIG. 2A shows a state immediately before an impact load F is applied to the impact absorbing member 10 from a substantially assumed direction (parallel to the axis). Since the impact load F acts perpendicularly to the tip surface S of the shock absorbing member 10, a compressive force acts on both front and rear ends of the shock absorbing member 10, and based on this force, a cylindrical metal body as shown in FIG. 11 is bent and deformed so that the front end portion 13 of the side portion is turned outward. This is an FS diagram indicated by a solid line in FIG. 4 and corresponds to a portion (i) where the load increases linearly. The initially formed notch 12 advances along the ridge line 14 of the adjacent side portion by bending deformation of the tip portion 13, and the tearing of the cylindrical metal body 11 is started. In FIG. 4, this corresponds to a range in which the load increases in a curve (b).

その後、図２（ｃ）（斜視図を図３に示す）のように、裂開の始まった筒状金属体１１の側部が、先端部１３を巻き込んでカール部１５を形成しながら剪断と曲げの連続変形を生じることで衝撃エネルギを吸収することとなる。すなわち、図４の（ハ）の領域であり、衝突時における衝撃吸収部材の変形挙動は吸収エネルギ量を安定化する連続圧潰挙動を示す。   Thereafter, as shown in FIG. 2 (c) (a perspective view is shown in FIG. 3), the side portion of the cylindrical metal body 11 that has started to tear is subjected to shearing while forming the curled portion 15 by entraining the tip portion 13. Impact energy is absorbed by the continuous deformation of bending. That is, it is the area | region of (c) of FIG. 4, and the deformation | transformation behavior of the impact-absorbing member at the time of a collision shows the continuous crushing behavior which stabilizes the amount of absorbed energy.

また、本発明の衝撃吸収部材では、図４に破線で示す蛇腹圧潰とは異なり、初期衝撃荷重のピークＦｉを生じることがないので、搭乗者に大きな衝撃を与える危険を低減することができる。   Further, in the impact absorbing member of the present invention, unlike the bellows crushing shown by the broken line in FIG. 4, the peak Fi of the initial impact load does not occur, so that the risk of giving a large impact to the passenger can be reduced.

本発明の衝撃吸収部材は、上記の実施形態に限定されるものではなく所望に応じて各種の変形が可能である。以下、変形例について説明する。
（変形例１）
図５は、本発明の衝撃吸収部材の筒状金属体１１の後端部を外側部材２１に嵌入させて接合したものである。この様な構成とすることで、筒状金属体１１で生じた裂開の進行を外側部材の先端部２１ａ付近で停止させることができる。つまり、衝撃吸収部材の吸収エネルギ量を調整したり、衝撃吸収部材の設置領域内において、重要部品や重要部材の破損を防御するために、衝撃吸収部材の裂開を途中で停止させる必要がある場合などには、同一形状の筒状金属体を用いて、外側部材を選択することにより圧潰のストロークを調節することができる。なお、筒状金属体１１と外側部材２１とは溶接あるいは接着など公知の方法で接合することができる。 The impact absorbing member of the present invention is not limited to the above embodiment, and various modifications can be made as desired. Hereinafter, modified examples will be described.
(Modification 1)
FIG. 5 is a view in which the rear end portion of the cylindrical metal body 11 of the shock absorbing member of the present invention is fitted and joined to the outer member 21. By setting it as such a structure, the progress of the tearing which arose in the cylindrical metal body 11 can be stopped in the front-end | tip part 21a vicinity of an outer member. In other words, it is necessary to stop the tearing of the shock absorbing member halfway in order to adjust the amount of energy absorbed by the shock absorbing member or to prevent damage to important parts or important members within the installation region of the shock absorbing member. In some cases, the crushing stroke can be adjusted by selecting the outer member using a cylindrical metal body having the same shape. The cylindrical metal body 11 and the outer member 21 can be joined by a known method such as welding or adhesion.

また、図６に示す筒状金属体１１の裂開の停止位置付近の側面にスリット２３を穿設した構造や、図７のように、例えば棒状の凸部２４を筒状金属体１１側部の所定の位置に設けることによっても裂開の進行を途中で停止させることができる。
（変形例２）
本発明の衝撃吸収部材は、筒状金属体の厚さを厚くしたり、強度の高い材料を使用することで吸収エネルギ量を増大させることができる。しかし、厚さを厚くすると重量が増加する、また、強度の高い材料は筒状金属体への成形が困難であったりコストが高いなどの問題がある。そこで、図８のように、筒状金属体の側面にリブ２５を設けることによって、同一厚さの筒状金属体であっても裂開時の曲げ応力を高めることができ、全体の衝撃吸収エネルギを増大することができる。
ここで、リブの形状や数を調整することで、吸収エネルギ量を調節することができる。 Further, as shown in FIG. 6, a structure in which a slit 23 is formed on the side surface in the vicinity of the position where the tearing of the cylindrical metal body 11 is stopped, or, for example, as shown in FIG. The progress of the cleavage can also be stopped halfway by providing it at a predetermined position.
(Modification 2)
The shock absorbing member of the present invention can increase the amount of absorbed energy by increasing the thickness of the cylindrical metal body or using a material having high strength. However, when the thickness is increased, the weight increases, and a material having high strength has problems such as difficulty in forming into a cylindrical metal body and high cost. Therefore, as shown in FIG. 8, by providing the rib 25 on the side surface of the cylindrical metal body, even when the cylindrical metal body has the same thickness, the bending stress at the time of tearing can be increased, and the entire shock absorption is achieved. Energy can be increased.
Here, the amount of absorbed energy can be adjusted by adjusting the shape and number of ribs.

また、図９は、裂開の途中から曲げ応力を高くして、部分的に吸収エネルギを大きくした例である。すなわち、図８に示す側面にリブ２５を形成した筒状金属体の側面の後半部に、リブの数を増やしたり、棒状あるいは板状の強度部材２６を接合して裂開時の側部の曲げ応力を前半部よりも高くすることができる。   FIG. 9 shows an example in which the absorbed energy is partially increased by increasing the bending stress from the middle of the cleavage. That is, the number of ribs is increased or the rod-shaped or plate-shaped strength member 26 is joined to the rear half of the side surface of the cylindrical metal body in which the rib 25 is formed on the side surface shown in FIG. Bending stress can be made higher than the first half.

図１０にこの様な構成とした衝撃吸収部材のＦ−Ｓ線図を模式的に示す。衝突により図９のリブ２５のみの部分が図１０の（ニ）の範囲のように連続圧潰される。さらに裂開が進行するとリブ２５の間に強度部材２６が接合された領域の裂開が始まるので、Ｆ−Ｓ線図の（ホ）の範囲では強度部材分だけの荷重が上乗せされたＦ−Ｓ線図となる。従って、同一吸収エネルギ量であれば、衝撃吸収部材を図９の構成とすることで図８のリブのみを形成した場合に比べて、ストロークは短くてよいこととなる。   FIG. 10 schematically shows an FS diagram of the impact absorbing member having such a configuration. Due to the collision, only the rib 25 in FIG. 9 is continuously crushed as in the range of FIG. As the cleaving further progresses, the cleaving of the region where the strength member 26 is joined between the ribs 25 starts. Therefore, in the range of (e) in the FS diagram, the F− with the load corresponding to the strength member added is added. It becomes an S diagram. Accordingly, if the amount of absorbed energy is the same, the stroke may be shorter as compared with the case where only the rib of FIG.

本発明の衝撃吸収部材は、筒状金属体の先端周縁部に切欠を設けるという極めて簡単な構成であるので、上記以外にも所望に応じて様々に変形することができる。例えば、切欠を有する筒状金属体の先端開口部を漏斗状に拡げたものも好ましい。この様に、衝突開始端面の開口部をやや拡げておくことで、衝撃吸収部材の軸心線と角度をもって衝突した場合でも、筒状金属体の側部が容易に外側にカールして裂開を開始することができるので安定したＦ−Ｓ特性を得ることができる。また、高い吸収エネルギ量を得るために端部に切欠を有する筒状金属体の内部（あるいは外部）にさらに同様に切欠を有する筒状金属体を嵌挿して用いることもできる。   Since the impact absorbing member of the present invention has a very simple configuration in which a notch is provided in the peripheral edge portion of the cylindrical metal body, it can be variously modified as desired in addition to the above. For example, a cylindrical metal body having a notch with a front end opening that is expanded in a funnel shape is also preferable. In this way, by slightly widening the opening at the collision start end face, even when the collision with the axis of the shock absorbing member occurs at an angle, the side portion of the cylindrical metal body easily curls outward and is split. Therefore, stable FS characteristics can be obtained. Further, in order to obtain a high amount of absorbed energy, a cylindrical metal body having a notch can also be inserted and used in the inside (or outside) of the cylindrical metal body having a notch at the end.

以上のように、本発明の衝撃吸収部材は、初期衝撃荷重のピーク荷重を小さくするとともに、所望のＦ−Ｓ線図を得るように吸収エネルギ量を調節することができる。また、安定した連続圧潰を実現できるので、圧潰の進行状況をＣＡＥ解析などで精度よく予測することができ、衝撃吸収部材について無駄のない限界設計を可能とする。   As described above, the impact absorbing member of the present invention can reduce the peak load of the initial impact load and adjust the amount of absorbed energy so as to obtain a desired FS diagram. In addition, since stable continuous crushing can be realized, the progress of crushing can be accurately predicted by CAE analysis or the like, and a limit design without waste is made possible for the impact absorbing member.

本発明の衝撃吸収部材は、その筒状金属体の衝突端面の周縁部に切欠を設けるという極めて簡単な方法で、初期衝撃荷重を小さくし、かつ、安定した連続圧潰を実現することができる。従って、圧潰の状況をＣＡＥ解析などで精度よく予測することができ無駄のない設計が可能となる。   The impact absorbing member of the present invention can reduce the initial impact load and realize stable continuous crushing by a very simple method of providing a notch in the peripheral edge portion of the collision end surface of the cylindrical metal body. Therefore, the crushing situation can be accurately predicted by CAE analysis or the like, and a design without waste is possible.

本発明の衝撃吸収部材は車体のクラッシュボックスなどとして好適に用いることができる。   The impact absorbing member of the present invention can be suitably used as a crash box for a vehicle body.

本発明の衝撃吸収部材の一例を示す斜視図である。It is a perspective view which shows an example of the impact-absorbing member of this invention. 衝突により衝撃吸収部材が変形する様子を示した側面模式図である。（ａ）は衝突前、（ｂ）は衝突直後、（ｃ）は裂開の進行中を示す。It is the side surface schematic diagram which showed a mode that the impact-absorbing member deform | transformed by the collision. (A) is before the collision, (b) is immediately after the collision, and (c) is in progress of the cleavage. 図２（ｃ）の斜視図である。FIG. 3 is a perspective view of FIG. 連続圧潰挙動におけるＦ−Ｓ線図の概念図である。It is a conceptual diagram of the FS diagram in a continuous crushing behavior. 裂開を途中で止める構成とした衝撃吸収部材の一例を示す斜視図である。外側部材を用いたもの。It is a perspective view which shows an example of the impact-absorbing member made into the structure which stops tearing on the way. Using an outer member. 裂開を途中で止める構成とした衝撃吸収部材の一例を示す斜視図である。スリットを形成したもの。It is a perspective view which shows an example of the impact-absorbing member made into the structure which stops tearing on the way. A slit is formed. 裂開を途中で止める構成とした衝撃吸収部材の一例を示す斜視図である。棒状の凸部を設けたもの。It is a perspective view which shows an example of the impact-absorbing member made into the structure which stops tearing on the way. A bar-shaped convex part. 吸収エネルギ量を高くした衝撃吸収部材の一例を示す斜視図である。側部にリブを設けたもの。It is a perspective view which shows an example of the impact-absorbing member which made the absorbed energy amount high. A rib on the side. 裂開の途中から吸収エネルギ量が増加するようにした衝撃吸収部材の一例を示す斜視図である。リブと強度部材を設けたもの。It is a perspective view which shows an example of the impact-absorbing member made to increase the amount of absorbed energy from the middle of cleavage. Provided with ribs and strength members. 図９の衝撃吸収部材のＦ−Ｓ特性の概念図である。It is a conceptual diagram of the FS characteristic of the impact-absorbing member of FIG. 蛇腹圧潰挙動におけるＦ−Ｓ線図を模式的に示したものである。The FS diagram in bellows crushing behavior is shown typically. クラッシュビードを設けた従来技術の衝撃吸収部材の一例を示す斜視図である。It is a perspective view which shows an example of the impact-absorbing member of the prior art which provided the crash bead.

符号の説明Explanation of symbols

１０：衝撃吸収部材 １１：筒状金属体 １２：切欠 １３：側部先端部 １５：カール部 ２１：外側部材 ２３：スリット ２４：凸部 ２５：リブ ２６：強度部材 ３１：クラッシュビーム DESCRIPTION OF SYMBOLS 10: Shock absorption member 11: Cylindrical metal body 12: Notch 13: Side part tip part 15: Curl part 21: Outer member 23: Slit 24: Convex part 25: Rib 26: Strength member 31: Crash beam

Claims (8)

筒状金属体の軸方向に衝撃荷重を受けて、該筒状金属体が圧潰することで衝突エネルギを吸収する衝撃吸収部材であって、
該筒状金属体の先端周縁部に該筒状金属体が裂開する起点となる切欠を有することを特徴とする衝撃吸収部材。 An impact absorbing member that receives impact load in the axial direction of the cylindrical metal body and absorbs collision energy when the cylindrical metal body is crushed,
An impact-absorbing member comprising a notch serving as a starting point at which the cylindrical metal body is torn at the peripheral edge of the tip of the cylindrical metal body. 前記筒状金属体の裂開を途中で停止させる停止手段を設けた請求項１に記載の衝撃吸収部材。   The impact-absorbing member according to claim 1, further comprising stop means for stopping the tearing of the cylindrical metal body halfway. 前記停止手段は前記筒状金属体の後端部を嵌入して接合した外側部材である請求項２に記載の衝撃吸収部材。   The impact absorbing member according to claim 2, wherein the stopping means is an outer member in which a rear end portion of the cylindrical metal body is fitted and joined. 前記停止手段は前記筒状金属体の側部に前記軸方向に直角に穿設されているスリットである請求項２に記載の衝撃吸収部材。   The impact absorbing member according to claim 2, wherein the stopping means is a slit formed in a side portion of the cylindrical metal body at a right angle to the axial direction. 前記停止手段は前記筒状金属体の側部に前記軸方向に直角に設けた凸部である請求項２に記載の衝撃吸収部材。   The impact absorbing member according to claim 2, wherein the stopping means is a convex portion provided on a side portion of the cylindrical metal body at a right angle to the axial direction. 前記筒状金属体の外周面に前記軸方向に平行に吸収エネルギを増大させる補強手段を有する請求項１に記載の衝撃吸収部材。   The impact-absorbing member according to claim 1, further comprising reinforcing means for increasing absorbed energy in parallel with the axial direction on an outer peripheral surface of the cylindrical metal body. 前記補強手段はリブである請求項６に記載の衝撃吸収部材。   The impact absorbing member according to claim 6, wherein the reinforcing means is a rib. 前記補強手段は棒状または板状の強度部材である請求項６に記載の衝撃吸収部材。   The impact absorbing member according to claim 6, wherein the reinforcing means is a rod-like or plate-like strength member.
JP2003391207A 2003-11-20 2003-11-20 Shock absorbing member Pending JP2005153567A (en)

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