JP2012224202A

JP2012224202A - Structural member excellent in collapse characteristic

Info

Publication number: JP2012224202A
Application number: JP2011093367A
Authority: JP
Inventors: Takeshi Torikai; 岳鳥飼; Masaya Takahashi; 昌也高橋
Original assignee: Sumitomo Light Metal Industries Ltd
Current assignee: Sumitomo Light Metal Industries Ltd
Priority date: 2011-04-19
Filing date: 2011-04-19
Publication date: 2012-11-15

Abstract

PROBLEM TO BE SOLVED: To provide a structural member excellent in collapse characteristics where a front board is hard to buckle and has a high collapse load.SOLUTION: The impact absorbing member 10 is constituted such that a hollow structure is formed with both an approximately semicircle like front face plate 12 and a straight line like back board 14 connecting both ends of the front face plate 12, and a central axis Z of the cross section of the impact absorbing member 10 is placed between the front face plate 12 and the back board 14, which passes through a point O of the center of a width direction of the back board 14 intersects perpendicularly to the back board 14, with two connection boards 16 and 16 tilting to the central axis Z whose inclination direction are mutually opposite are arranged to become a line symmetry to the central axis Z, and finally the front face plate 12 and the back board 14 are connected in one with the two connection boards 16 and 16.

Description

本発明は、構造部材に係り、特に、圧壊特性に優れ、例えば自動車用のエネルギー吸収部材として好適に用いられる中空の構造部材に関するものである。 The present invention relates to a structural member, and more particularly to a hollow structural member that has excellent crushing characteristics and is suitably used as an energy absorbing member for automobiles, for example.

従来より、自動車の衝突安全性向上のために、各種のエネルギー吸収部材（衝撃吸収部材）が用いられてきている。例えば、衝突時の車体の損傷を緩和するためのエネルギー吸収部材の一つとして、自動車用バンパー補強材が用いられている。そして、そのような自動車用バンパー補強材の一つとして、特開２００６−２７４９９号公報（特許文献１）においては、車両の幅方向に配設したバンパビームの外側に取り付けられて、このバンパビームに小さな衝撃が加わったときに変形することによって、衝撃を吸収するようにした衝撃吸収部材が、明らかにされている。 Conventionally, various energy absorbing members (impact absorbing members) have been used to improve collision safety of automobiles. For example, a bumper reinforcing material for automobiles is used as one of energy absorbing members for alleviating damage to a vehicle body at the time of a collision. As one of such bumper reinforcing materials for automobiles, Japanese Patent Application Laid-Open No. 2006-27499 (Patent Document 1) is attached to the outside of a bumper beam disposed in the width direction of the vehicle and is small in this bumper beam. An impact absorbing member that absorbs an impact by being deformed when an impact is applied has been clarified.

具体的には、そのような公報に開示の衝撃吸収部材（バンパー補強材）は、アルミニウム押出形材にて形成されたものであって、自動車のバンパビームの外側に当接する板状の当接部と、この当接部の両端を略半円状に繋ぐ円弧部と、この円弧部に、前記当接部中央から二股状に且つ凸状の曲線状に延びる、湾曲したＹ字形状を呈する第１・第２の接続リブとを備えた中空構造において、構成されている。そして、この車両用バンパビームに設けられる衝撃吸収部材にあっては、第１・第２の接続リブを当接部中央から二股状に且つ凸状の曲線上に正面板まで延ばしたＹ字形状とされているところから、正面板に荷重が加わったときに、かかる第１・第２の接続リブは、正面板と当接部との間で突っ張ることがなく、凸状の二股部分が円滑に変形しつつ、衝撃を吸収することが出来ることとされている。 Specifically, the shock absorbing member (bumper reinforcing material) disclosed in such a gazette is formed of an aluminum extruded profile, and is a plate-like contact portion that contacts the outside of a bumper beam of an automobile. And a circular arc portion connecting both ends of the contact portion in a substantially semicircular shape, and a circular Y-shape extending in a bifurcated and convex curved shape from the center of the contact portion on the circular arc portion. The hollow structure having the first and second connecting ribs is configured. And, in the shock absorbing member provided in this vehicle bumper beam, the first and second connecting ribs are bifurcated from the center of the abutting portion and extend to the front plate on a convex curve, Therefore, when a load is applied to the front plate, the first and second connecting ribs do not stretch between the front plate and the contact portion, and the convex bifurcated portion is smooth. It is supposed that the shock can be absorbed while being deformed.

しかしながら、かかる特許文献１に明らかにされている衝撃吸収部材において採用される断面形状では、衝撃荷重が加わったときに、正面板が座屈し易いため、圧壊荷重が低くなってしまうという問題を内在するものであった。 However, the cross-sectional shape adopted in the shock absorbing member disclosed in Patent Document 1 has a problem in that the crushing load becomes low because the front plate is likely to buckle when an impact load is applied. It was something to do.

特開２００６−２７４９９号公報JP 2006-27499 A

ここにおいて、本発明は、かかる事情を背景にして為されたものであって、その解決課題とするところは、正面板が座屈しにくく、圧壊荷重が高い、圧壊特性に優れた構造部材を提供することにある。 Here, the present invention has been made in the background of such circumstances, and the problem to be solved is to provide a structural member that is less likely to buckle the front plate, has a high crushing load, and has excellent crushing characteristics. There is to do.

そして、本発明にあっては、かくの如き課題の解決のために、横断面形状が円弧形状の正面板と、該正面板の円弧形状の両端部を繋いで、中空構造を形成する直線状の背面板と、該中空構造内において、それら正面板と背面板との間に配置され、それら両者を一体的に連結する２枚の連結板とよりなる中空の一体的な構造部材であって、その横断面形状において、前記２枚の連結板は、前記背面板の前記正面板の両端部を繋ぐ方向となる幅方向の中央の点を通って該背面板に直交する中心軸に対して、該背面板に向かって拡開する方向に傾斜し、且つその傾斜方向が互いに逆方向であると共に、該中心軸に関して各連結板が線対称に配置されており、更に、前記正面板の外側面と該中心軸との交点と、前記背面板の外側面との間の距離：Ｈと、該背面板の幅寸法の半分の長さ：Ｌとが、次式：
２０ｍｍ≦Ｈ≦１００ｍｍ
０．６０≦（Ｈ／Ｌ）≦１．４０
を満足する関係にあり、そして前記連結板の厚さ方向の中心線と前記正面板の外側面との交点をＡ１点とした場合に、前記中心軸から該Ａ１点までの距離：ａ１が
（Ｌ／６）≦ａ１≦（Ｌ／４）
の範囲内にあり、また該中心軸と該連結板の厚さ方向の中心線がなす角度：θが、３°乃至７°の範囲内にあることを特徴とする構造部材を、その要旨とするものである。 And, in the present invention, in order to solve such problems, the front plate having a circular cross-sectional shape and the both ends of the circular arc shape of the front plate are connected to form a linear structure. A hollow integrated structural member comprising a back plate and two connecting plates which are disposed between the front plate and the back plate in the hollow structure and integrally connect them. In the cross-sectional shape, the two connecting plates pass through a central point in the width direction, which is a direction connecting both ends of the front plate of the back plate, with respect to a central axis perpendicular to the back plate. And inclined in the direction of expanding toward the back plate, and the inclined directions are opposite to each other, and the connecting plates are arranged symmetrically with respect to the central axis, and A distance between the intersection of the side surface and the central axis and the outer surface of the back plate: H Half the length of the width dimension of said back plate: L and has the following formula:
20mm ≦ H ≦ 100mm
0.60 ≦ (H / L) ≦ 1.40
When the intersection point between the center line in the thickness direction of the connecting plate and the outer surface of the front plate is defined as A1 point, the distance from the central axis to the A1 point: a1 is (1) L / 6) ≦ a1 ≦ (L / 4)
And an angle formed by the central axis and the center line in the thickness direction of the connecting plate: θ is in the range of 3 ° to 7 °, To do.

また、かかる本発明に従う構造部材の望ましい態様の一つによれば、前記正面板の横断面形状は、以下の式：
（Ｘ／Ｌ）²＋（Ｙ／Ｈ）²＝１
（ここで、横断面形状における背面板中央の点を原点：Ｏとした場合において、Ｘは正面板横断面形状の水平方向の座標であり、Ｙは正面板横断面形状の垂直方向の座標であり、Ｌ及びＨは、それぞれ先に規定の通りである）
によって、定められることとなる。 Moreover, according to one of the desirable aspects of the structural member according to this invention, the cross-sectional shape of the said front board is the following formula | equation:
(X / L) ² + (Y / H) ² = 1
(Here, when the center point of the back plate in the cross-sectional shape is the origin: O, X is the horizontal coordinate of the front plate cross-sectional shape, and Y is the vertical coordinate of the front plate cross-sectional shape. Yes, L and H are as defined above)
It will be determined by.

さらに、本発明に従う構造部材の別の望ましい態様の一つによれば、前記正面板、前記背面板、及び前記連結板の厚みは、それぞれ、１ｍｍ乃至４ｍｍの範囲内とされ、更に別の望ましい態様の一つによれば、前記正面板、前記背面板、及び前記連結板は、アルミニウム合金にて一体的に形成されることとなる。 Furthermore, according to one of the other desirable embodiments of the structural member according to the present invention, the thicknesses of the front plate, the back plate, and the connecting plate are in the range of 1 mm to 4 mm, respectively, and are further desirable. According to one aspect, the front plate, the back plate, and the connecting plate are integrally formed of an aluminum alloy.

このような本発明に従う構造部材にあっては、正面板が、円弧形状を呈する略半円状の横断面形状とされると共に、その中空の内部に、二つの連結板が「ハ」の字状形態において配設されているところから、構造部材に加えられる荷重を、かかる略半円部分で受けることによって、アーチ効果と支承効果とが有利に発揮され得て、圧壊荷重を効果的に高めることが出来ることとなるのであり、以て、優れた圧壊特性を示すことが可能となる。 In such a structural member according to the present invention, the front plate has a substantially semicircular cross-sectional shape having an arc shape, and the two connecting plates have a letter C in the hollow interior. Since the load applied to the structural member is received by such a semi-circular portion from the arrangement in the shape, the arch effect and the bearing effect can be advantageously exhibited, and the crush load is effectively increased. Therefore, it is possible to exhibit excellent crushing characteristics.

特に、正面板と背面板との間に配置され、それら両者を一体的に連結する２枚の連結板が、背面板の幅方向中央の点を通って、背面板に直交する中心軸に対して傾斜し、且つ、その傾斜方向が互いに逆方向となって、前記中心軸に関して各連結板が線対称になるように、「ハ」の字形状に配置されていることによって、構造部材に荷重が加えられた際に、そのような荷重が入力する正面板が座屈し難くなる効果が、有利に発揮せしめられ得るのである。 In particular, the two connecting plates that are arranged between the front plate and the back plate and integrally connect both of them pass through a center point in the width direction of the back plate, and the center axis perpendicular to the back plate And the inclined directions are opposite to each other, and the connecting plates are arranged symmetrically with respect to the central axis, so that the load is applied to the structural member. The effect of making it difficult for the front plate to which such a load is input to be buckled is exerted advantageously.

また、本発明においては、正面板の外側面と背面板の幅方向の中央を通る中心軸との交点と、背面板の外側面との間の距離：Ｈが、２０ｍｍ≦Ｈ≦１００ｍｍの範囲とされ、且つかかる距離：Ｈと背面板の幅寸法の半分の長さ：Ｌとの関係が、式：０．６０≦（Ｈ／Ｌ）≦１．４０を満足するように構成されているところから、衝撃荷重を充分に吸収できるだけの変形量を確保することが出来ると共に、実用的な幅寸法範囲において、構造部材に荷重が加えられた際の連結板の座屈形態が、幅方向においてほぼ対称となって、衝撃吸収性能を効果的に高めることが出来る特徴を発揮することとなる。 In the present invention, the distance H between the intersection of the outer surface of the front plate and the central axis passing through the center in the width direction of the rear plate and the outer surface of the rear plate is in the range of 20 mm ≦ H ≦ 100 mm. In addition, the relationship between the distance: H and the half length of the width dimension of the back plate: L satisfies the formula: 0.60 ≦ (H / L) ≦ 1.40. Therefore, it is possible to secure a deformation amount sufficient to absorb the impact load, and in the practical width dimension range, the buckling form of the connecting plate when the load is applied to the structural member is in the width direction. It becomes almost symmetrical and exhibits the characteristics that can effectively improve the shock absorbing performance.

さらに、本発明においては、連結板の前記中心軸からの距離：ａ１や、かかる中心軸と連結板の厚さ方向の中心線がなす角度：θが、適切な範囲内の値となるように構成されているところから、構造部材に衝撃荷重が加えられて、その衝撃を吸収するために変形する際に、その変形初期において、連結板同士が接触して変形が不安定となったり、正面板や連結板が座屈しやすくなったりすることがなく、効果的に衝撃吸収をすることが出来、その結果、優れた圧壊特性を示すことが可能となる。 Further, in the present invention, the distance from the central axis of the connecting plate: a1 and the angle formed by the central axis and the center line in the thickness direction of the connecting plate: θ are values within an appropriate range. When the structure member is subjected to an impact load and deforms to absorb the impact, the connecting plates come into contact with each other at the initial stage of the deformation, and the deformation becomes unstable. The face plate and the connecting plate are not easily buckled, and the shock can be effectively absorbed. As a result, it is possible to exhibit excellent crushing characteristics.

本発明に従う構造部材としての衝撃吸収部材の一例を示す横断面説明図である。It is a cross-sectional explanatory drawing which shows an example of the impact-absorbing member as a structural member according to this invention. 従来の構成とされた衝撃吸収部材の一例を示す横断面説明図である。It is a cross-sectional explanatory drawing which shows an example of the impact-absorbing member made into the conventional structure. 実施例における圧縮試験にて用いたプレス装置を概略的に示す正面説明図である。It is front explanatory drawing which shows roughly the press apparatus used in the compression test in an Example. 実施例１において実施した圧縮試験の結果を示すグラフである。3 is a graph showing the results of a compression test performed in Example 1. 本発明に従う衝撃吸収部材の圧縮試験による座屈形態の一例を示す説明図である。It is explanatory drawing which shows an example of the buckling form by the compression test of the impact-absorbing member according to this invention. 本発明に従う衝撃吸収部材の圧縮試験による座屈形態の別の一例を示す説明図である。It is explanatory drawing which shows another example of the buckling form by the compression test of the impact-absorbing member according to this invention. 実施例２において実施した圧縮試験の結果の一例を示すグラフである。6 is a graph showing an example of a result of a compression test performed in Example 2. 実施例２において実施した圧縮試験の結果の別の一例を示すグラフである。10 is a graph showing another example of the result of the compression test performed in Example 2. 実施例２において実施した圧縮試験の結果の更に別の一例を示すグラフである。10 is a graph showing still another example of the result of the compression test performed in Example 2.

以下、本発明を更に具体的に明らかにするために、本発明の実施の形態について、図面を参照しつつ、詳細に説明することとする。 Hereinafter, in order to clarify the present invention more specifically, embodiments of the present invention will be described in detail with reference to the drawings.

先ず、図１には、本発明に従う構造部材の実施形態の一つとして、自動車のバンパー補強材として好適に用いられる長手の衝撃吸収部材が、横断面図の形態において、概略的に示されている。そこにおいて、衝撃吸収部材１０は、略半円状の正面板１２と、この正面板１２の両端部を繋いで中空構造を形成する直線状の背面板１４と、それら正面板１２と背面板１４との間に配置され、両者を一体的に連結する２枚の連結板１６，１６とから構成されて、紙面に垂直な方向に延びる所定長さの構造体として構成されている。そして、かかる横断面図の形態において、それら２枚の連結板１６，１６は、背面板１４の幅方向中央の点：Ｏを通り、背面板１４に直交する、衝撃吸収部材１０の横断面の中心軸：Ｚに対して傾斜して、その傾斜方向が互いに逆方向であり、更に、かかる中心軸：Ｚに対して、各連結板１６，１６が、線対称となるように配置されている。 First, FIG. 1 schematically shows a longitudinal impact absorbing member suitably used as a bumper reinforcing material for an automobile as one embodiment of a structural member according to the present invention in the form of a cross-sectional view. Yes. The shock absorbing member 10 includes a substantially semicircular front plate 12, a linear back plate 14 that connects both ends of the front plate 12 to form a hollow structure, and the front plate 12 and the back plate 14. The two connecting plates 16 and 16 are integrally connected to each other and are configured as a structure having a predetermined length extending in a direction perpendicular to the paper surface. And in the form of such a cross-sectional view, these two connecting plates 16, 16 are cross sections of the shock-absorbing member 10 passing through a point O at the center in the width direction of the back plate 14 and orthogonal to the back plate 14. Inclined with respect to the central axis: Z, the directions of inclination are opposite to each other, and the connecting plates 16, 16 are arranged so as to be symmetrical with respect to the central axis: Z. .

より詳細には、衝撃吸収部材１０を構成する正面板１２や背面板１４、連結板１６は、アルミニウム合金、鉄合金、マグネシウム合金等の金属材料や樹脂材料等の公知の材料の中から、適宜に選択された材料を用いて構成され得るが、それらの中でも、本発明では、アルミニウム合金からなる材料にて一体的に構成されていることが好ましく、ここでは、アルミニウム合金（材質、質別：Ａ７０２１−Ｔ６、耐力：３８０ＭＰａ）により構成されている。また、正面板１２及び背面板１４の厚み：ｔは、ここでは３ｍｍとされ、２枚の連結板１６，１６の厚み：ｔ’は、ここでは２ｍｍとされている。なお、これら正面板１２や背面板１４、連結板１６の厚み（ｔ、ｔ’）は、好ましくは１ｍｍ乃至４ｍｍの範囲内とされることとなる。これは、それら厚みｔ、ｔ’が１ｍｍ未満とされた場合には、押出成形操作によって衝撃吸収部材１０を製作する際に押出性が悪くなり、目的とする製品を製作するのが難しくなるためであり、一方、かかる厚みｔ、ｔ’が４ｍｍを超える場合にあっては、衝撃吸収部材１０の質量が増加して、その適用用途における軽量化が困難となるからである。 More specifically, the front plate 12, the back plate 14, and the connecting plate 16 constituting the shock absorbing member 10 are appropriately selected from known materials such as metal materials such as aluminum alloys, iron alloys, and magnesium alloys, and resin materials. Among them, in the present invention, it is preferable that the material is integrally formed of a material made of an aluminum alloy. Here, the aluminum alloy (material, quality: A7021-T6, yield strength: 380 MPa). Further, the thickness t of the front plate 12 and the back plate 14 is 3 mm here, and the thickness t ′ of the two connecting plates 16 and 16 is 2 mm here. The thickness (t, t ') of the front plate 12, the back plate 14, and the connecting plate 16 is preferably in the range of 1 mm to 4 mm. This is because when the thicknesses t and t ′ are less than 1 mm, the extrudability deteriorates when the shock absorbing member 10 is manufactured by the extrusion molding operation, and it becomes difficult to manufacture the target product. On the other hand, when the thicknesses t and t ′ exceed 4 mm, the mass of the shock absorbing member 10 increases, and it is difficult to reduce the weight in the application.

また、円弧形状の正面板１２の外側面と背面板１４の外側面との間の距離：Ｈ、即ち中心軸Ｚと正面板１２の外側面との交点と、中心軸Ｚと背面板１４の外側面との交点（Ｏ）との間の距離：Ｈは、２０ｍｍ以上、１００ｍｍ以下の範囲の大きさとされており、ここでは、３０ｍｍとなっている。これは、そのような距離：Ｈが２０ｍｍ未満とされた場合には、連結板１６の長さが短くなるため、衝撃吸収部材１０に加えられる衝撃荷重を充分に吸収することが出来るだけの変形量を確保することが困難となるからである。一方、かかる距離：Ｈが１００ｍｍを超える場合には、連結板１６の長さが長くなり、連結板１６が幅方向において対称に座屈せず、幅方向の一方に偏った座屈形態が生じやすくなり、衝撃吸収量(耐荷重)の絶対値が低くなる問題を惹起する。 Further, the distance H between the outer surface of the arc-shaped front plate 12 and the outer surface of the back plate 14, that is, the intersection of the central axis Z and the outer surface of the front plate 12, the center axis Z and the back plate 14. The distance between the intersection with the outer side surface (O): H is in the range of 20 mm or more and 100 mm or less, and is 30 mm here. This is because, when such a distance: H is less than 20 mm, the length of the connecting plate 16 is shortened, so that the deformation sufficient to absorb the impact load applied to the impact absorbing member 10 is sufficient. It is because it becomes difficult to secure the amount. On the other hand, when this distance: H exceeds 100 mm, the length of the connecting plate 16 becomes long, and the connecting plate 16 does not buckle symmetrically in the width direction, and a buckling form biased to one side in the width direction is likely to occur. This causes a problem that the absolute value of the amount of shock absorption (withstand load) is lowered.

さらに、衝撃吸収部材１０は、そのような距離：Ｈと、背面板１４の幅寸法の半分の長さ：Ｌとの関係が、０．６０≦（Ｈ／Ｌ）≦１．４０を満足するようにされており、ここでは、Ｌの長さが３０ｍｍとされていることによって、Ｈ／Ｌの値は、１．００となっている。なお、前式において、Ｈ／Ｌの値が０．６０未満となる場合には、幅寸法に比べて、厚み方向の寸法が小さくなり過ぎるために、衝撃吸収部材１０としての実用的な幅寸法範囲においては、連結板１６において衝撃を充分に吸収できるだけの変形量を確保することが困難となる問題がある。一方、Ｈ／Ｌが１．４０を超える場合にあっては、連結板１６が幅方向で対称に座屈せずに、幅方向の一方に偏った座屈を生じ易くなるため、衝撃吸収性が悪くなってしまう問題がある。このように、ＨとＬの関係を上述の範囲に維持することによって、衝撃吸収部材１０の実用的な幅寸法範囲において、衝撃を吸収する際の連結板１６の座屈形態が幅方向においてほぼ対称となり、衝撃吸収性能を効果的に高めることが出来るのである。 Further, in the shock absorbing member 10, the relationship between such distance: H and half length of the width dimension of the back plate 14: L satisfies 0.60 ≦ (H / L) ≦ 1.40. Here, since the length of L is 30 mm, the value of H / L is 1.00. In the above equation, when the value of H / L is less than 0.60, the dimension in the thickness direction is too small compared to the width dimension, so that the practical width dimension as the shock absorbing member 10 is obtained. In the range, there is a problem that it is difficult to secure a deformation amount that can sufficiently absorb an impact in the connecting plate 16. On the other hand, when H / L exceeds 1.40, the connecting plate 16 does not buckle symmetrically in the width direction, and tends to be buckled in one direction in the width direction, so that the shock absorption property is reduced. There is a problem that gets worse. In this way, by maintaining the relationship between H and L in the above-described range, the buckling form of the connecting plate 16 when absorbing the shock is substantially in the width direction in the practical width dimension range of the shock absorbing member 10. It becomes symmetrical and can effectively enhance the shock absorbing performance.

なお、かかる正面板１２の円弧形状は、図１の横断面形状における背面板１４の幅方向中央の点を原点：Ｏとして、水平方向をＸ座標（図１における左右方向）とし、垂直方向をＹ座標（図１における上下方向）とした場合に、以下の式：
（Ｘ／Ｌ）²＋（Ｙ／Ｈ）²＝１
によって定められることが好ましく、図１に例示された衝撃吸収部材１０にあっても、その正面板１２は、上記の関係を満たすものとなっている。 The arc shape of the front plate 12 is such that the center in the width direction of the back plate 14 in the cross-sectional shape of FIG. 1 is the origin: O, the horizontal direction is the X coordinate (left and right direction in FIG. 1), and the vertical direction is When the Y coordinate (vertical direction in FIG. 1) is used, the following formula:
(X / L) ² + (Y / H) ² = 1
Preferably, the front plate 12 satisfies the above relationship even in the shock absorbing member 10 illustrated in FIG.

さらに、正面板１２と背面板１４とを連結する連結板１６にあっては、その厚さ方向の中心線：ＣＬと正面板１２の外側面との交点：Ａ１点から、中心軸：Ｚまでの距離：ａ１が、前述した背面板１４の幅寸法の半分の長さ：Ｌとの間に、（Ｌ／６）≦ａ１≦（Ｌ／４）の関係を満たす範囲内の距離とされ、ここでは、ａ１＝６．０ｍｍとなるように構成されている。これは、ａ１がＬ／６未満とされた場合には、衝撃吸収部材１０が衝撃を吸収するために変形する際に、その変形初期において、２枚の連結板１６，１６同士が接触して変形が不安定となるからであり、一方、ａ１がＬ／４以上とされた場合は、２枚の連結板１６，１６同士の距離が離れているため、正面板１２が座屈し易くなってしまい、充分な衝撃吸収が出来なくなる恐れがあるからである。 Further, in the connecting plate 16 that connects the front plate 12 and the back plate 14, the center line in the thickness direction: the intersection of the CL and the outer surface of the front plate 12: from the point A1 to the central axis: Z. The distance: a1 is a distance within a range satisfying the relationship of (L / 6) ≦ a1 ≦ (L / 4) with the half length: L of the width dimension of the back plate 14 described above, Here, it is configured so that a1 = 6.0 mm. This is because, when a1 is less than L / 6, when the shock absorbing member 10 is deformed to absorb the shock, the two connecting plates 16, 16 come into contact with each other at the initial stage of the deformation. This is because the deformation becomes unstable. On the other hand, when a1 is set to L / 4 or more, the front plate 12 is likely to buckle because the distance between the two connecting plates 16 is increased. This is because there is a possibility that sufficient shock absorption cannot be performed.

また、かかる連結板１６は、中心軸：Ｚと連結板１６の厚さ方向の中心線：ＣＬがなす角度：θが、３°乃至７°の範囲内となるように、配設されており、ここでは、５°となっている。けだし、θが３°未満となる場合には、衝撃吸収における変形の際に、連結板１６が座屈し易くなる問題があり、一方、θが７°を超える場合には、衝突面から入力される荷重を分散し難くなるため、充分な衝撃吸収効果が発揮されなくなる恐れがあるからである。 The connecting plate 16 is arranged so that the angle θ formed by the central axis Z and the center line CL in the thickness direction of the connecting plate 16 is within a range of 3 ° to 7 °. Here, it is 5 °. However, if θ is less than 3 °, there is a problem that the connecting plate 16 is likely to buckle during deformation in shock absorption. On the other hand, if θ exceeds 7 °, it is input from the collision surface. This is because a sufficient impact absorbing effect may not be exhibited because it is difficult to disperse the load.

なお、かくの如き構成からなる衝撃吸収部材１０は、その用途に応じて適宜の長さにおいて構成された長手の構造部材とされるのであるが、一般には、２００ｍｍ〜１５００ｍｍ程度の長さが採用されることとなる。 The shock absorbing member 10 having such a configuration is a longitudinal structural member having an appropriate length depending on the application, but generally has a length of about 200 mm to 1500 mm. Will be.

そして、このような本発明に従う構造を有する長手の衝撃吸収部材１０にあっては、円弧形状を呈する略半円状の横断面形状とされた正面板１２と、正面板１２の円弧形状の両端部を繋ぐ直線状の背面板１４によって中空構造が形成され、そのような中空の内部に、２枚の連結板１６，１６が「ハ」の字状に配設され、それらの大きさや厚さ等の寸法、配設位置等が適切な範囲とされているところから、衝撃吸収部材１０に加えられる衝撃荷重を受ける際に、略半円状の正面板１２によるアーチ効果と、連結板１６による支承効果とが、有利に発揮されることとなる。そして、その結果、衝撃吸収部材１０の圧壊荷重を効果的に高めることが出来、以て、優れた圧壊特性を示すことが可能となるのである。 In the longitudinal impact absorbing member 10 having such a structure according to the present invention, the front plate 12 having a substantially semicircular cross-sectional shape having an arc shape and both ends of the arc shape of the front plate 12 are provided. A hollow structure is formed by the straight back plate 14 connecting the parts, and two connecting plates 16 and 16 are arranged in a “C” shape inside the hollow, and their size and thickness When the impact load applied to the shock absorbing member 10 is received, the arch effect by the substantially semicircular front plate 12 and the connection plate 16 are used. The bearing effect will be exhibited advantageously. As a result, the crushing load of the impact absorbing member 10 can be effectively increased, and therefore, excellent crushing characteristics can be exhibited.

以上、本発明の代表的な実施形態の一つについて詳述してきたが、それは、あくまでも例示に過ぎないものであって、本発明は、そのような実施形態に係る具体的な記述によって、何等、限定的に解釈されるものではないことが、理解されるべきである。また、その他、一々列挙はしないが、本発明は、当業者の知識に基づいて、種々なる変更、修正、改良等を加えた態様において実施され得るものであり、そして、そのような実施態様が、本発明の趣旨を逸脱しない限りにおいて、何れも、本発明の範疇に属するものであることは、言うまでもないところである。 As described above, one of the representative embodiments of the present invention has been described in detail. However, this is merely an example, and the present invention is not limited by the specific description according to such an embodiment. It should be understood that this is not to be construed as limiting. In addition, although not enumerated one by one, the present invention can be implemented in a mode with various changes, modifications, improvements, etc. based on the knowledge of those skilled in the art. Needless to say, all of these are within the scope of the present invention without departing from the spirit of the present invention.

以下に、本発明の代表的な実施例を示し、本発明の特徴について更に明確にすることとするが、本発明が、そのような実施例の記載によって、何等限定的に解釈されるものでないことは、言うまでもないところである。 In the following, typical examples of the present invention will be shown and the characteristics of the present invention will be further clarified. However, the present invention is not construed as being limited in any way by the description of such examples. It goes without saying.

［実施例１］
先ず、本発明に従う構造部材として、図１に示される横断面形状を呈する衝撃吸収部材（１０）を、アルミニウム合金（材質、質別：Ａ７０２１-Ｔ６、耐力：３８０ＭＰａ)を用いて、押出操作にて製作し、これを、試験材１とした。この試験材１に係る衝撃吸収部材（１０）において、正面板１２の外側面と背面板１４の外側面との間の距離：Ｈは３０ｍｍ、背面板１４の幅寸法の半分の長さ：Ｌは３０ｍｍとした。つまり、試験材１たる衝撃吸収部材（１０）における（Ｈ／Ｌ）は１．００とした。さらに、正面板１２及び背面板１４の厚み：ｔは３ｍｍ、連結板１６の厚み：ｔ’は２ｍｍとし、中心軸：ＺからＡ１点までの距離：ａ１は６．０ｍｍ、中心軸：Ｚと中心線：ＣＬのなす角度：θは５°とした。 [Example 1]
First, as a structural member according to the present invention, an impact absorbing member (10) having a cross-sectional shape shown in FIG. 1 is subjected to an extrusion operation using an aluminum alloy (material, quality: A7021-T6, proof stress: 380 MPa). This was used as test material 1. In the shock absorbing member (10) according to the test material 1, the distance between the outer surface of the front plate 12 and the outer surface of the back plate 14: H is 30 mm, and the length half of the width dimension of the back plate 14: L Was 30 mm. That is, (H / L) in the impact absorbing member (10) as the test material 1 was set to 1.00. Furthermore, the thickness of the front plate 12 and the back plate 14 is 3 mm, the thickness of the connecting plate 16 is t ′, 2 mm, the central axis: the distance from Z to the A1 point: a1 is 6.0 mm, and the central axis is Z. Center line: Angle formed by CL: θ was 5 °.

一方、比較のために、従来の構造とされた構造部材として、図２に示される如きものを準備した。即ち、横断面形状が略半円状の円弧形状の正面板２２と、その円弧形状の両端部を繋いで中空構造を形成する直線状の背面板２４と、かかる中空構造内に、背面板２４の中央から垂直に立ち上がり、その途中から二股状に分かれて、それぞれの先端が正面板２２に連結された形状（略Ｙ字形状）の連結板２６が配置されて、構成される衝撃吸収部材２０を、試験材１と同様に、アルミニウム合金（材質、質別：Ａ７０２１−Ｔ６、耐力：３８０ＭＰａ）を用いて、押出操作にて製作し、これを、試験材２とした。ここで、正面板２２の外側面と背面板２４の外側面との間の距離：Ｈは３０ｍｍ、背面板２４の幅寸法の半分の長さ：Ｌは３０ｍｍとし、正面板２２及び背面板２４の厚み：ｔは３ｍｍ、連結板２６の厚み：ｔ’は２ｍｍとした。なお、ここでは、正面板２２と背面板２４の大きさや形状は、本発明に従う構造とされた試験材１のものと同等のものとされている。そして、連結板２６は、背面板２４の中央から垂直に１０ｍｍ立ち上がり、その途中から二股状に分かれた部位は、曲率半径（ｒ）：３０ｍｍで延び、その先端と正面板２２との交点をＰとする場合に、中心線：Ｚから交点：Ｐまでの距離：ｐが１５ｍｍとなるようにした。なお、各試験材の長さ（断面の奥行き方向長さ）は、何れも２０ｍｍとした。 On the other hand, for comparison, a structural member having a conventional structure was prepared as shown in FIG. That is, an arc-shaped front plate 22 having a substantially semicircular cross section, a linear back plate 24 that connects both ends of the arc-shape to form a hollow structure, and the back plate 24 within the hollow structure. The shock absorbing member 20 is configured to be vertically arranged from the center of the head, and to be divided into two forks from the middle thereof, each of which is connected to the front plate 22 in a shape (substantially Y-shaped) connecting plate 26. Was produced by an extrusion operation using an aluminum alloy (material, quality: A7021-T6, yield strength: 380 MPa) in the same manner as the test material 1, and this was designated as test material 2. Here, the distance between the outer surface of the front plate 22 and the outer surface of the back plate 24: H is 30 mm, the length half the width of the back plate 24: L is 30 mm, the front plate 22 and the back plate 24. The thickness: t was 3 mm, and the thickness of the connecting plate 26: t ′ was 2 mm. Here, the size and shape of the front plate 22 and the back plate 24 are the same as those of the test material 1 having a structure according to the present invention. The connecting plate 26 rises 10 mm vertically from the center of the back plate 24, and a portion divided into two forks from the middle extends with a radius of curvature (r): 30 mm, and the intersection of the front end and the front plate 22 is P In this case, the distance from the center line: Z to the intersection: P: p was set to 15 mm. The length of each test material (the length in the depth direction of the cross section) was 20 mm.

次いで、このように準備した試験材１及び試験材２の衝撃吸収部材について、荷重を付加する試験を行い、衝撃吸収性の評価を行った。かかる評価としては、図３に示されるようなプレス装置３０を用いて、圧縮試験を行った。このプレス装置３０は、載置台３２に対して昇降部３４が昇降するように構成されており、両者の間に生じる荷重は、ここでは図示しないロードセルによって測定出来るようにされている。そして、本評価においては、図３に示される如く、載置台３２と昇降部３４との間に試験材１及び試験材２の衝撃吸収部材を挟みこんで、両者で徐々に圧縮する試験を行った。そして、その結果を、図４の荷重・変位線図に示した。なお、かかる荷重・変位線図においては、縦軸を荷重（ｋＮ）とし、横軸を変位（ｍｍ）として、それらの関係を示している。 Next, the impact absorbing members of the test material 1 and the test material 2 prepared as described above were subjected to a test for applying a load, and the impact absorbability was evaluated. As such an evaluation, a compression test was performed using a press device 30 as shown in FIG. The press device 30 is configured such that an elevating unit 34 is moved up and down with respect to the mounting table 32, and a load generated between the two can be measured by a load cell (not shown). In this evaluation, as shown in FIG. 3, an impact absorbing member of the test material 1 and the test material 2 is sandwiched between the mounting table 32 and the elevating part 34 and a test is performed in which both are gradually compressed. It was. The results are shown in the load / displacement diagram of FIG. In the load / displacement diagram, the vertical axis represents the load (kN) and the horizontal axis represents the displacement (mm), and the relationship is shown.

かかる図４の結果より明らかなように、本発明に従う構造とされた試験材１に係る衝撃吸収部材は、従来の構造とされた試験材２に係る衝撃吸収部材と比較して、同一荷重では、変位を小さくすることが出来ることが確認できる。一方、同一変位では、高荷重に耐えることが出来ることが確認できる。即ち、本発明に従う試験材１に係る衝撃吸収部材は、従来の試験材２に係る衝撃吸収部材よりも、衝撃吸収性が優れていることが解るのである。つまり、本発明の構成を適用した衝撃吸収部材は、従来の構成とされた衝撃吸収部材と同程度の性能を確保しようとした場合に、薄肉化や小型化をすることが出来、その結果、衝撃吸収部材の軽量化が可能となるのである。また、本発明の構成を適用した衝撃吸収部材を、従来の構成とされた衝撃吸収部材と同程度の大きさや板厚で作製する場合には、より高い衝撃吸収性能を有することとなるのである。 As is clear from the results of FIG. 4, the impact absorbing member according to the test material 1 having the structure according to the present invention has the same load as that of the impact absorbing member according to the test material 2 having the conventional structure. It can be confirmed that the displacement can be reduced. On the other hand, it can be confirmed that the same displacement can withstand a high load. That is, it can be seen that the shock absorbing member according to the test material 1 according to the present invention is superior in shock absorption to the shock absorbing member according to the conventional test material 2. That is, the impact absorbing member to which the configuration of the present invention is applied can be reduced in thickness and size when attempting to secure the same level of performance as the impact absorbing member having the conventional configuration. This makes it possible to reduce the weight of the shock absorbing member. In addition, when the impact absorbing member to which the configuration of the present invention is applied is manufactured with the same size and thickness as the impact absorbing member having the conventional configuration, it has higher impact absorbing performance. .

［実施例２］
前述した実施例１と同様に、本発明に従う横断面形状を有する衝撃吸収部材について、更に、距離：Ｈと長さ：Ｌの各値を変更した試験材を各種作製した後、それらについて、圧縮試験を実施して、その座屈形態を観察し、更にエネルギー吸収量を測定して、評価を行った。ここで準備した試験材は、図１に示される如く横断面形状を有する、本発明に従う構成とされた実施例としての３種類の試験材Ｅ３１〜Ｅ３３と、Ｈ／Ｌの関係が本発明の範囲外の値となる比較例としての２種類の試験材Ｃ３１、Ｃ３２とした。 [Example 2]
In the same manner as in Example 1 described above, for the impact absorbing member having the cross-sectional shape according to the present invention, various test materials with different values of distance: H and length: L were prepared, and then compressed. The test was carried out, the buckling form was observed, and the energy absorption was further measured and evaluated. The test materials prepared here have a cross-sectional shape as shown in FIG. 1, and three types of test materials E31 to E33 as examples according to the present invention and the relationship of H / L are in accordance with the present invention. Two types of test materials C31 and C32 as comparative examples having values outside the range were used.

なお、これらの各試験材の材質、質別及び耐力は、いずれも同じとし、材質はＡ７０２１、質別はＴ６、耐力は３８０ＭＰａのアルミニウム合金とした。また、これらの試験材において、何れも、正面板１２及び背面板１４の厚み：ｔは３ｍｍ、連結板１６の厚み：ｔ’は２ｍｍとし、中心軸：ＺからＡ１点までの距離：ａ１はＬ／５ｍｍ、中心軸：Ｚと中心線：ＣＬのなす角度：θは５°とした。更に、各試験材によって異なる値としたＨとＬの寸法及びＨ／Ｌの関係については、下記表１に示した。また、各試験材の長さ（断面の奥行き方向長さ）は、何れも２０ｍｍとした。 Note that the materials, qualities and proof stresses of these test materials were all the same, and the material was an A7021, the tempered material was T6, and the proof stress was 380 MPa aluminum alloy. In these test materials, the thickness of the front plate 12 and the back plate 14 is 3 mm, the thickness of the connecting plate 16 is 2 mm, and the distance from the central axis Z to the point A1 is a1. L / 5 mm, central axis: Z and central line: angle formed by CL: θ was 5 °. Further, Table 1 below shows the dimensions of H and L and the relationship between H / L, which are different values depending on each test material. The length of each test material (the length in the depth direction of the cross section) was 20 mm.

そして、それら準備した各試験材に対する圧縮試験は、実施例１と同様に、図３に示すようなプレス装置３０を用いて、実施した。即ち、載置台３２に対して昇降部３４が昇降するように構成され、両者の間に生じる荷重が、ここでは図示しないロードセルによって測定出来るようにされているプレス装置３０を用い、そのプレス装置３０の載置台３２と昇降部３４との間に、各試験材を挟みこんで、両者で徐々に圧縮する試験を行った。なお、このように行った試験において、評価方法は、次のようにした。 And the compression test with respect to each prepared test material was implemented like Example 1 using the press apparatus 30 as shown in FIG. In other words, a press device 30 is used in which a lift 34 is configured to move up and down with respect to the mounting table 32, and a load generated between them can be measured by a load cell (not shown). Each of the test materials was sandwiched between the mounting table 32 and the elevating unit 34, and a test was performed in which both were gradually compressed. In the test conducted in this way, the evaluation method was as follows.

先ず、座屈形態は、図５に示す如く、発生する座屈形態、即ち、連結板１６の変形形態が、Ｌ方向の対称軸（背面板１４の幅方向中央の点：Ｏを通り、背面板１４に直交する中心軸：Ｚ）に関してほぼ対称である場合を、適正（○）とした。また、図６に示す如く、発生する座屈形態が、Ｌ方向の対称軸（中心軸：Ｚ）に関して対称ではなく、一方に偏った非対称の場合を、不適正（×）とした。 First, as shown in FIG. 5, the buckling form is a buckling form that occurs, that is, the deformed form of the connecting plate 16 passes through a symmetrical axis in the L direction (a center point in the width direction of the back plate 14: O, The case where it was substantially symmetric with respect to the central axis (Z) orthogonal to the face plate 14 was determined as appropriate (◯). In addition, as shown in FIG. 6, when the generated buckling form is not symmetric with respect to the symmetry axis (center axis: Z) in the L direction but is asymmetrical toward one side, it is determined as inappropriate (×).

さらに、エネルギー吸収性能を評価するため、各試験材について得られた荷重・変位線図からエネルギー吸収量（Ｎ・ｍ）をそれぞれ求めた。また、比較のために、図２に示されるような、横断面形状が略半円状の円弧形状の正面板２２と、その円弧形状の両端部を繋いで中空構造を形成する直線状の背面板２４と、かかる中空構造内に、背面板２４の中央から垂直に立ち上がり、その途中から二股状に分かれて、それぞれの先端が正面板２２と連結された形状（略Ｙ字形状）の連結板２６が配置されてなる、従来の構成とされた衝撃吸収部材において、ＨやＬ、及びｔやｔ’の寸法が各試験材と同等のサイズのものを、比較材ＣＥ３１，ＣＥ３２，ＣＥ３３，ＣＣ３１，ＣＣ３２として作製し、それらについても、同様の試験により、荷重・変位線図からエネルギー吸収量をそれぞれ求めた。なお、それら比較材の連結板２６の背面板２４からの立ち上がり寸法はＨ／３ｍｍとし、Ｙ字状に分かれた部位の曲率半径：ｒはＬｍｍ、中心線：Ｚから交点：Ｐまでの距離：ｐはＬ／２ｍｍとなるようにした。そして、そのような各比較材のエネルギー吸収量と、対応する各試験材のエネルギー吸収量の比を、エネルギー吸収量比とした。 Furthermore, in order to evaluate energy absorption performance, the energy absorption amount (N · m) was obtained from the load / displacement diagram obtained for each test material. For comparison, as shown in FIG. 2, a straight plate that forms a hollow structure by connecting the arc-shaped front plate 22 with a substantially semicircular cross-sectional shape and both ends of the arc shape. A face plate 24 and a connecting plate having a shape (substantially Y-shaped) in which the front plate 22 rises vertically from the center of the back plate 24 and is bifurcated in the middle, and each tip is connected to the front plate 22. In the shock absorbing member having a conventional configuration, in which the dimensions of H and L, and t and t ′ are the same size as each test material, comparison materials CE31, CE32, CE33, and CC31 are provided. , CC32, and the energy absorption amount was obtained from the load / displacement diagram by the same test. The rising dimension from the back plate 24 of the connecting plate 26 of these comparative materials is H / 3 mm, the radius of curvature of the portion divided into Y-shape: r is Lmm, the distance from the center line: Z to the intersection: P: p was set to L / 2 mm. And ratio of the energy absorption amount of each such comparative material and the energy absorption amount of each corresponding test material was made into energy absorption amount ratio.

ここで、得られた荷重・変位線図の代表例として、図７には、試験材Ｅ３２と比較材ＣＥ３２についてのものを、また図８には、試験材Ｃ３１と比較材ＣＣ３１についてのものを、更に図９には、試験材Ｃ３２と比較材ＣＣ３２についてのものを、それぞれ示した。これらの図において、横軸は変位（ｍｍ）を、縦軸は荷重（ｋＮ、２０ｍｍ幅）として示している。 Here, as representative examples of the obtained load / displacement diagrams, FIG. 7 shows the test material E32 and the comparative material CE32, and FIG. 8 shows the test material C31 and the comparative material CC31. Further, FIG. 9 shows the test material C32 and the comparative material CC32, respectively. In these drawings, the horizontal axis indicates displacement (mm), and the vertical axis indicates load (kN, 20 mm width).

以上の評価結果を、表１に併せて示した。なお、エネルギー吸収量(Ｎ・ｍ)は、ストローク(変位量)１０ｍｍまでの値である。かかる表１から明らかなように、Ｈ／Ｌが本発明の範囲内である試験材Ｅ３１、Ｅ３２、Ｅ３３は、全て座屈形態がＬ方向の対称軸について対称（図５参照）となり、且つ、従来の構造とされた比較材ＣＥ３１、ＣＥ３２、ＣＥ３３に比べて、良好なエネルギー吸収性能を有していることが解る。 The above evaluation results are also shown in Table 1. The energy absorption amount (N · m) is a value up to a stroke (displacement) of 10 mm. As apparent from Table 1, the test materials E31, E32, and E33 whose H / L is within the scope of the present invention are all symmetric with respect to the symmetry axis in the L direction (see FIG. 5). It can be seen that the comparative materials CE31, CE32, and CE33 having a conventional structure have better energy absorption performance.

一方、試験材Ｃ３１は、座屈形態は、Ｌ方向の対称軸についてほぼ対称な形態を示したものの、Ｈ／Ｌの関係が本発明の範囲外の値とされた０．５０と下限を外れているため、従来の構造とされた比較材ＣＣ３１と比べても、荷重・変位線図に大きな差がなく、エネルギー吸収性能の充分な向上効果が得られないことが解る。 On the other hand, although the test material C31 showed a substantially buckling shape with respect to the symmetry axis in the L direction, the H / L relationship was 0.50, which was outside the range of the present invention, and deviated from the lower limit. Therefore, even when compared with the comparative material CC31 having a conventional structure, it is understood that there is no large difference in the load / displacement diagram, and a sufficient improvement effect of energy absorption performance cannot be obtained.

また、試験材Ｃ３２は、Ｈ／Ｌ＝１．５０と、本発明の範囲の上限を外れており、Ｌに対してＨが大き過ぎるため、座屈形態がＬ方向の対称軸について非対称（図６参照）となった。このような非対称の座屈形態が容易に生じたことにより、エネルギー吸収量（耐荷重）の絶対値が低下して、充分なエネルギー吸収性能が得られなかった。ただし、従来の構造とされた比較材ＣＣ３２も耐荷重の絶対値が低く、結果的には、形状的な効果によって、エネルギー吸収量比は適正な値となっている。 Further, the test material C32 is H / L = 1.50, which is outside the upper limit of the range of the present invention, and because H is too large with respect to L, the buckling form is asymmetric with respect to the symmetry axis in the L direction (see FIG. 6). Since such an asymmetric buckling form was easily generated, the absolute value of the amount of energy absorption (withstand load) was lowered, and sufficient energy absorption performance could not be obtained. However, the comparative material CC32 having a conventional structure also has a low absolute value of load resistance, and as a result, the energy absorption ratio is an appropriate value due to the shape effect.

総合的な評価として、座屈形態が適正（○）で、耐荷重の絶対値が比較的高く、且つ、エネルギー吸収量比が適正で従来形状よりも充分な向上効果が得られること、つまり、座屈形態とエネルギー吸収量比の両方が適正であることが必要である。 As a comprehensive evaluation, the buckling form is appropriate (◯), the absolute value of the load resistance is relatively high, and the energy absorption ratio is appropriate, and a sufficient improvement effect than the conventional shape can be obtained. It is necessary that both the buckling form and the energy absorption amount ratio are appropriate.

［実施例３］
ここで、実施例２の結果を補完するために、Ｈが２０〜１００ｍｍの範囲内であることを前提とし、Ｌ及びＨの値を変更した試験材３１〜４１を準備し、実施例２と同様の圧縮試験を行った。なお、これらの試験材において、Ｌ及びＨ以外の各値は、何れも、実施例２と同様とした。そして、実施例２と同様に、エネルギー吸収量及びエネルギー吸収量比を測定した。また、各試験材のエネルギー吸収量比を求めるために用いたそれぞれの比較材は、実施例２と同様の形状及び寸法とした。各試験材のＬやＨの値、及びその結果を、下記表２に示す。ここで、エネルギー吸収量は、４００Ｎ・ｍ以上を合格（○）とし、それ未満を不合格（×）として、評価した。 [Example 3]
Here, in order to complement the results of Example 2, on the premise that H is in the range of 20 to 100 mm, test materials 31 to 41 in which the values of L and H are changed are prepared. A similar compression test was performed. In these test materials, all values other than L and H were the same as in Example 2. Then, as in Example 2, the energy absorption amount and the energy absorption amount ratio were measured. Moreover, each comparison material used in order to obtain | require the energy absorption amount ratio of each test material was made into the same shape and dimension as Example 2. FIG. The values of L and H for each test material and the results are shown in Table 2 below. Here, the energy absorption amount was evaluated with 400 N · m or more as a pass (◯) and less than a reject (×).

かかる表２の結果から明らかなように、Ｈ／Ｌの値が０．６０未満の場合には、エネルギー吸収量比が１．０５を下回る場合が生じ、エネルギー吸収性能の充分な向上効果が得られなかった。さらに、Ｈ／Ｌの値が１．４０を超える場合には、耐荷重が低く、エネルギー吸収量の絶対値が充分に得られなかった。 As is apparent from the results in Table 2, when the H / L value is less than 0.60, the energy absorption ratio may be less than 1.05, and a sufficient improvement effect of energy absorption performance is obtained. I couldn't. Furthermore, when the value of H / L exceeded 1.40, the load resistance was low, and the absolute value of the energy absorption amount was not sufficiently obtained.

［実施例４］
さらに、実施例２の結果を補完するために、Ｈが３０ｍｍ、Ｌが３０ｍｍ（Ｈ／Ｌ＝１．００）の場合において、横断面形状における背面板１４の中央部（Ｏ）に直交する中心軸：Ｚと、連結板１６の厚さ方向の中心線：ＣＬがなす角度：θと、連結板１６の厚さ方向の中心線：ＣＬと正面板１２の外側面との交点：Ａ１点から、中心軸：Ｚまでの距離：ａ１の値を各種変更した試験材４２〜５０を準備し、それぞれに対して、前記した実施例２と同様の圧縮試験を行った。そして、実施例２と同様に、エネルギー吸収量及びエネルギー吸収量比を測定した。各試験材の寸法とその試験結果を、下記表３に示す。ここで、エネルギー吸収量は、４００Ｎ・ｍ以上を合格（○）とし、それ未満を不合格（×）として、評価した。なお、各試験材のエネルギー吸収量比を求めるために用いたそれぞれの比較材は、実施例２と同様の形状及び寸法とした。 [Example 4]
Furthermore, in order to complement the results of Example 2, when H is 30 mm and L is 30 mm (H / L = 1.00), the center orthogonal to the central portion (O) of the back plate 14 in the cross-sectional shape Axis: Z, center line in the thickness direction of the connecting plate 16: angle formed by CL: θ, center line in the thickness direction of the connecting plate 16: intersection of CL and the outer surface of the front plate 12: from point A1 Further, test materials 42 to 50 having various values of the central axis: distance to Z: a1 were prepared, and the same compression test as in Example 2 was performed on each of the test materials. Then, as in Example 2, the energy absorption amount and the energy absorption amount ratio were measured. The dimensions of each test material and the test results are shown in Table 3 below. Here, the energy absorption amount was evaluated with 400 N · m or more as a pass (◯) and less than a reject (×). In addition, each comparison material used in order to obtain | require the energy absorption amount ratio of each test material was made into the shape and dimension similar to Example 2. FIG.

かかる表３の結果から明らかなように、ａ１／Ｌの値が１／６未満の場合には、変形初期において、連結板同士が接触するため、変形が不安定となり、エネルギー吸収性能の充分な向上効果が得られなかった。さらに、ａ１／Ｌの値が１／４を超える場合には、正面板が早期に座屈し、エネルギー吸収性能の充分な向上効果が得られなかった。また、θの値が３°未満の場合には、連結板が早期に座屈し、エネルギー吸収性能の充分な向上効果が得られなかった。さらに、θの値が７°を超える場合には、衝突面からの入力荷重を充分に分散できず、エネルギー吸収性能の充分な向上効果が得られなかった。 As is clear from the results of Table 3, when the value of a1 / L is less than 1/6, the connecting plates come into contact with each other in the initial stage of deformation, so that the deformation becomes unstable and the energy absorption performance is sufficient. Improvement effect was not obtained. Furthermore, when the value of a1 / L exceeds 1/4, the front plate buckled early and a sufficient improvement effect of energy absorption performance was not obtained. Moreover, when the value of θ was less than 3 °, the connecting plate was buckled early, and the effect of sufficiently improving the energy absorption performance could not be obtained. Further, when the value of θ exceeds 7 °, the input load from the collision surface cannot be sufficiently dispersed, and the effect of sufficiently improving the energy absorption performance cannot be obtained.

１０衝撃吸収部材
１２正面板
１４背面板
１６連結板
10 Shock absorbing member 12 Front plate 14 Back plate 16 Connecting plate

Claims

A cross-sectional shape of the front plate having a circular arc shape, a straight back plate that connects the both ends of the circular arc shape of the front plate, forming a hollow structure, and the front plate and the back plate in the hollow structure A hollow integrated structural member that is arranged between two connecting plates that are disposed between and integrally connect them,
In the cross-sectional shape, the two connecting plates pass through a central point in the width direction, which is a direction connecting both ends of the front plate of the back plate, with respect to a central axis orthogonal to the back plate, Inclined in the direction of expanding toward the back plate, the directions of inclination are opposite to each other, and each connecting plate is arranged symmetrically with respect to the central axis, and further, the outer surface of the front plate The distance between the intersection between the center axis and the outer surface of the back plate: H, and the half length L of the width of the back plate:
20mm ≦ H ≦ 100mm
0.60 ≦ (H / L) ≦ 1.40
When the intersection point between the center line in the thickness direction of the connecting plate and the outer surface of the front plate is defined as A1 point, the distance from the central axis to the A1 point: a1 is (1) L / 6) ≦ a1 ≦ (L / 4)
An angle θ between the central axis and the center line in the thickness direction of the connecting plate: θ is in the range of 3 ° to 7 °.

The cross-sectional shape of the front plate has the following formula:
(X / L) ² + (Y / H) ² = 1
(Here, when the center point of the back plate in the cross-sectional shape is the origin: O, X is the horizontal coordinate of the front plate cross-sectional shape, and Y is the vertical coordinate of the front plate cross-sectional shape. Yes, L and H are as defined above)
The structural member according to claim 1, defined by:

The structural member according to claim 1 or 2, wherein thicknesses of the front plate, the back plate, and the connecting plate are in a range of 1 mm to 4 mm, respectively.

The structural member according to any one of claims 1 to 3, wherein the front plate, the back plate, and the connecting plate are integrally formed of an aluminum alloy.