JP2001124128A - Polygonal hollow member for absorbing impact - Google Patents
Polygonal hollow member for absorbing impactInfo
- Publication number
- JP2001124128A JP2001124128A JP30442899A JP30442899A JP2001124128A JP 2001124128 A JP2001124128 A JP 2001124128A JP 30442899 A JP30442899 A JP 30442899A JP 30442899 A JP30442899 A JP 30442899A JP 2001124128 A JP2001124128 A JP 2001124128A
- Authority
- JP
- Japan
- Prior art keywords
- outer peripheral
- peripheral wall
- polygonal
- curvature
- corner
- Prior art date
- 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.)
- Pending
Links
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、例えば自動車の
バンパーのクラッシュボックス等に用いられる衝撃吸収
用多角形中空材に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shock absorbing polygonal hollow member used for, for example, a crash box of an automobile bumper.
【０００２】なお、この明細書において、「アルミニウ
ム」の語はアルミニウムおよびその合金の両者を含む意
味で用いられる。[0002] In this specification, the term "aluminum" is used to include both aluminum and its alloys.
【０００３】[0003]
【従来の技術および発明が解決しようとする課題】近年
自動車業界では、環境問題に配慮して車輌重量の軽量化
による燃料消費量の削減を実現するため、バンパー等の
衝撃吸収材のアルミニウム化とともに中空化を積極的に
進めている。バンパーはリインフォースメントとクラッ
シュボックスとにより構成されているが、クラッシュボ
ックスは、軽量化するために断面積をより小さくし、か
つエネルギー吸収特性が良好であることが要求される。2. Description of the Related Art In recent years, in the automotive industry, in order to reduce the fuel consumption by reducing the weight of the vehicle in consideration of environmental issues, the use of aluminum in shock absorbers such as bumpers has been increasing. Active hollowing out. The bumper is composed of a reinforcement and a crash box, and the crash box is required to have a smaller cross-sectional area and to have good energy absorption characteristics in order to reduce the weight.
【０００４】従来、この種の衝撃吸収材は断面円形また
は角形のパイプ材からなり、衝突時に作用する衝撃荷重
を軸方向の圧縮荷重として受け、この軸方向の圧縮荷重
により座屈変形することによって衝突時の衝撃を緩和し
ようとするものである。Conventionally, this kind of shock absorbing material is made of pipe material having a circular or square cross section, receives an impact load acting upon collision as an axial compression load, and buckles by the axial compression load. It is intended to reduce the impact at the time of collision.
【０００５】一般に、断面角形の衝撃吸収材は、圧縮荷
重を受けた時に図４に示すような荷重−変位曲線を示
す。即ち、角形衝撃吸収材は概ね蛇腹状に規則変形する
ことから、その荷重−変位曲線は座屈初期に最大荷重
（矢印イ）を生じた後、振動するものとなる。同図中、
ロ線は平均荷重を示している。In general, a shock absorber having a rectangular cross section shows a load-displacement curve as shown in FIG. 4 when subjected to a compressive load. That is, since the rectangular shock absorbing material is regularly deformed into a bellows shape, its load-displacement curve vibrates after a maximum load (arrow A) is generated in the initial stage of buckling. In the figure,
The b line indicates the average load.
【０００６】このような荷重−変位特性を示す衝撃吸収
材において、より最適な衝撃吸収特性を実現するために
は、座屈初期に生じる最大荷重（矢印ハ）を下げるとと
もに、その後の座屈による平均荷重（ロ線）を上げるこ
とが要求される。In order to realize more optimal shock absorbing characteristics of the shock absorbing material exhibiting such load-displacement characteristics, the maximum load (arrow C) generated in the initial stage of buckling is reduced and the buckling caused by the subsequent buckling is reduced. It is required to increase the average load (b).
【０００７】この発明は、如上の技術背景に鑑み、軽量
でありかつ衝撃吸収特性に優れた衝撃吸収用多角形中空
材の提供を目的とする。In view of the above technical background, an object of the present invention is to provide a polygonal hollow material for shock absorption which is lightweight and has excellent shock absorption characteristics.
【０００８】[0008]
【課題を解決するための手段】前記目的を達成するため
に、この発明の衝撃吸収用多角形中空材は、断面におい
て、外周壁（11）が四角形以上の多角形であり、内部
に、前記多角形の角部（11）を一端とし多角形の中心を
通る中桟（13）を有し、前記外周壁（11）と中桟（13）
とで形成される三角形中空部（14）が形成されているこ
とを特徴とする。In order to achieve the above object, a polygonal hollow material for shock absorption according to the present invention has a cross section in which the outer peripheral wall (11) has a polygonal shape of a quadrangle or more, and the inside thereof has the above-mentioned shape. A middle crosspiece (13) having a corner (11) of the polygon as one end and passing through the center of the polygon, and having the outer peripheral wall (11) and the middle crosspiece (13)
And a triangular hollow portion (14) formed by:
【０００９】前記衝撃吸収用多角形中空材において、前
記外周壁（11）の直辺部（18）の肉厚（ｔ１）および中
桟（13）の肉厚（ｔ２）は、それぞれ０．８〜１０mmで
あることが好ましい。また、前記三角形中空部（14）の
外周壁側角部（15）および中心側角部（16）は円弧状に
形成され、かつこれらの曲率半径（Ｒ１）（Ｒ２）がＷ
／６０≦Ｒ１≦Ｗ／３、Ｗ／６０≦Ｒ２≦Ｗ／３（ただ
し、Ｒ１：中空部の外周壁側角部の曲率半径、Ｒ２：中
空部の中心側角部の曲率半径、Ｗ：対向する外周壁間の
寸法）の範囲内に設定されていることが好ましい。ま
た、前記外周壁（11）の角部（12）は円弧状に形成さ
れ、かつその曲率半径（Ｒ３）が０＜Ｒ３＜Ｗ／２（た
だし、Ｗ：対向する外周壁間の寸法）の範囲内に設定さ
れていることが好ましい。In the shock absorbing polygonal hollow material, the thickness (t1) of the right side portion (18) of the outer peripheral wall (11) and the thickness (t2) of the middle crosspiece (13) are each 0.8. It is preferably from 10 to 10 mm. The outer peripheral wall side corner (15) and the center side corner (16) of the triangular hollow portion (14) are formed in an arc shape, and their radii of curvature (R1) and (R2) are W.
/ 60 ≦ R1 ≦ W / 3, W / 60 ≦ R2 ≦ W / 3 (where R1: radius of curvature of the outer peripheral wall side corner of the hollow portion, R2: radius of curvature of the central side corner portion of the hollow portion, W: (Dimension between opposing outer peripheral walls). Further, a corner (12) of the outer peripheral wall (11) is formed in an arc shape and has a radius of curvature (R3) of 0 <R3 <W / 2 (W: dimension between opposing outer peripheral walls). Preferably, it is set within the range.
【００１０】さらに前記衝撃吸収用多角形中空材は、ア
ルミニウム押出材により形成されていることが好まし
い。[0010] Further, it is preferable that the shock absorbing polygonal hollow material is formed of an extruded aluminum material.
【００１１】[0011]
【発明の実施の形態】図１および図２に、本願発明の衝
撃吸収用多角形中空材の一実施形態を示す。この記衝撃
吸収用多角形中空材（１）は、断面正六角形の外周壁
（11）を有し、その内部においては、各角部（12）が正
六角形の中心を通る中桟（13）によって対向する角部
（12）とつながれて、外周壁（13）と中桟（13）とによ
り形成された６つの三角形の中空部（14）を有してい
る。また、前記外周壁（11）の各角部（11）は曲率半径
（Ｒ３）の円弧状に形成されているとともに、前記三角
形中空部（14）の外周壁側角部（15）（15）は曲率半径
（Ｒ１）、中心側角部（16）は曲率半径（Ｒ２）の円弧
状にそれぞれ形成され、全体に丸みを帯びた六角形状と
なされている。1 and 2 show one embodiment of a shock absorbing polygonal hollow member according to the present invention. The shock absorbing polygonal hollow material (1) has an outer peripheral wall (11) having a regular hexagonal cross section, and inside each corner (12) passes through the center of the regular hexagon (13). And has six triangular hollow portions (14) formed by the outer peripheral wall (13) and the middle crosspiece (13). Each corner (11) of the outer peripheral wall (11) is formed in an arc shape having a radius of curvature (R3), and the outer peripheral wall side corners (15) (15) of the triangular hollow portion (14). Is formed in an arc shape having a radius of curvature (R1), and the center corner (16) is formed in an arc shape having a radius of curvature (R2), and is formed in a rounded hexagonal shape as a whole.
【００１２】前記衝撃吸収用多角形中空材（１）におい
て、断面積当たりのエネルギー吸収量を高めて軽量化と
優れた衝撃吸収特性とを実現するために、外周壁（11）
形状および中桟（13）位置を規定する。さらに、これら
の効果を助長するために、各部の肉厚の好適範囲を定め
るとともに、角部（12）（15）（16）を所定の曲率半径
（Ｒ１）（Ｒ２）（Ｒ３）の円弧状に形成する。In the shock absorbing polygonal hollow member (1), an outer peripheral wall (11) is provided in order to increase the amount of energy absorption per cross-sectional area to realize weight reduction and excellent shock absorbing characteristics.
The shape and the position of the middle crosspiece (13) are defined. Further, in order to promote these effects, a preferable range of the thickness of each part is determined, and the corners (12), (15), and (16) are formed in an arc shape having a predetermined radius of curvature (R1) (R2) (R3). Formed.
【００１３】前記衝撃吸収用多角形中空材（１）は、外
周壁（11）の断面形状を四角形以上の多角形とする。断
面多角形とするのは、周方向において強度差があるため
に蛇腹状の規則的な座屈変形を生じやすく、良好な衝撃
吸収特性が得られるためである。また、三角形では、圧
縮形状が不均一になりやすいため、四角形以上とする。
また、角数は、五角形、七角形、九角形．．．の奇数角
形よりも四角形、六角形、八角形．．．の偶数角形が好
ましい。これは、偶数角形であれば、後述の中桟（13）
の両端が常に角部（12）につながり、軸線を対称軸とす
る回転対称形となって規則的に座屈変形しやすいためで
ある。ただし、角数が増すと、円形に近づき、周方向で
有意な強度差が得られないため、四角形から八角形が好
ましい。また、規則的に座屈変形させるために、正多角
形が好ましい。In the shock absorbing polygonal hollow member (1), the cross-sectional shape of the outer peripheral wall (11) is a quadrangle or more polygon. The reason why the cross section is polygonal is that there is a difference in strength in the circumferential direction, so that bellows-like regular buckling deformation is likely to occur, and good shock absorption characteristics can be obtained. In the case of a triangle, the compression shape is likely to be non-uniform, so that the shape is set to be quadrangle or more.
In addition, the number of corners is pentagon, heptagon, nine-sided. . . Squares, hexagons, and octagons than odd-numbered polygons. . . Are preferred. If this is an even square,
Are always connected to the corners (12), and are rotationally symmetrical with the axis as the axis of symmetry, and are easily buckled and deformed regularly. However, when the number of corners increases, the shape approaches a circle, and a significant difference in intensity in the circumferential direction cannot be obtained. Therefore, a square to an octagon is preferable. In addition, a regular polygon is preferable for buckling deformation regularly.
【００１４】また、前記中桟（13）は、規則的な座屈変
形を促すために、外周壁（11）の一つの角部（12）を一
端とし、多角形の中心を通るように形成される。図１等
に示す断面偶数角形の中空材（１）では全ての中桟（1
3）の両端が角部（12）にくるが、図３（Ａ）（Ｂ）に
示す断面奇数角形の中空材（30）（35）では、各中桟
（31）の他端が対向辺上にきて中桟（31）が中心で交差
する場合（図Ａ）と、各中桟（36）の他端が中心で集結
する場合（図Ｂ）とがある。The middle crosspiece (13) is formed so that one corner (12) of the outer peripheral wall (11) passes through the center of the polygon in order to promote regular buckling deformation. Is done. In the hollow member (1) shown in FIG.
Although both ends of 3) come to the corners (12), in the hollow members (30) and (35) having an odd-angled cross section shown in FIGS. 3A and 3B, the other ends of the middle crosspieces (31) are opposite sides. There is a case where the middle crosspiece (31) crosses at the center when coming up (FIG. A), and a case where the other ends of each middle crosspiece (36) gather at the center (FIG. B).
【００１５】また、前記衝撃吸収用多角形中空材（１）
において、外周壁（11）および中桟（13）の肉厚は薄い
ほど軽量化されることは言うまでもないが、その反面、
断面積が小さくなって衝撃吸収力が低下する。しかし、
外周壁（11）の角部（12）および中空部（14）の角部
（15）（16）を円弧状に形成することにより、外周壁
（11）の角部（12）、および中桟（13）が交差または集
結する中央部（17）が部分的に厚肉となって衝撃吸収力
を増大させることができる。また、外周壁（11）の直辺
部（18）や中桟（13）を厚肉に形成するよりも、これら
の部分（12）（17）を部分的に厚肉に形成する方が衝撃
吸収力増大に直結するため、衝撃吸収量／断面積が高く
なり、軽量化と衝撃吸収特性の向上とを同時に実現する
ことができる。Further, the polygonal hollow material for shock absorption (1)
In, it goes without saying that the thinner the outer wall (11) and the middle crosspiece (13) are, the lighter the weight is.
The cross-sectional area becomes smaller and the shock absorbing power decreases. But,
By forming the corners (12) of the outer peripheral wall (11) and the corners (15) and (16) of the hollow portion (14) in an arc shape, the corners (12) of the outer peripheral wall (11) and the center rail are formed. The central portion (17) where the (13) intersects or converges becomes partially thicker, so that the shock absorbing power can be increased. Also, forming these portions (12) and (17) partially thicker than forming the right side portion (18) and the middle crosspiece (13) of the outer peripheral wall (11) thicker has an impact. Since this directly leads to an increase in the absorbing power, the amount of shock absorption / cross-sectional area increases, and it is possible to simultaneously achieve weight reduction and improvement in shock absorption characteristics.
【００１６】即ち、前記外周壁（11）の直辺部（18）の
肉厚（ｔ１）および中桟（13）の肉厚（ｔ２）は、とも
に０．８〜１０mmが好ましい。この発明の衝撃吸収用多
角形中空材は製造方法を規定するものではないが、複雑
断面形状の中空材を良好に製造できる点で押出によって
製造することが好ましく、肉厚（ｔ１）（ｔ２）が０．
８mm未満では押出困難となり、かつ衝撃吸収時に割れが
生じるおそれがある。一方、１０mmを超えると重くなり
軽量化に逆行する。外周壁（11）の直辺部（18）の肉厚
（ｔ１）の特に好ましい下限値は１mmであり、特に好ま
しい上限値は８mmである。中桟（13）の肉厚（ｔ２）の
特に好ましい下限値は０．５mmであり、特に好ましい上
限値は６mmである。また、これらの肉厚の関係はｔ１≧
ｔ２とすることが好ましい。That is, the thickness (t1) of the right side portion (18) of the outer peripheral wall (11) and the thickness (t2) of the middle crosspiece (13) are both preferably 0.8 to 10 mm. The impact absorbing polygonal hollow material of the present invention does not specify a manufacturing method, but is preferably manufactured by extrusion from the viewpoint that a hollow material having a complex cross-sectional shape can be favorably manufactured, and has a thickness (t1) (t2). Is 0.
If it is less than 8 mm, extrusion becomes difficult, and cracks may occur at the time of impact absorption. On the other hand, if it exceeds 10 mm, it becomes heavy and goes against weight reduction. A particularly preferred lower limit of the thickness (t1) of the right side portion (18) of the outer peripheral wall (11) is 1 mm, and a particularly preferred upper limit is 8 mm. A particularly preferred lower limit of the thickness (t2) of the middle crosspiece (13) is 0.5 mm, and a particularly preferred upper limit is 6 mm. Further, the relationship between these thicknesses is t1 ≧
It is preferably t2.
【００１７】また、前記三角形の中空部（14）の外周壁
側角部（15）の曲率半径（Ｒ１）および中心側角部（1
6）の曲率半径（Ｒ２）は、いずれも対向する外周壁間
の寸法（Ｗ）に対し、Ｗ／６０≦Ｒ１≦Ｗ／３、Ｗ／６
０≦Ｒ２≦Ｗ／３を満足することが好ましい。曲率半径
（Ｒ１）（Ｒ２）がＷ／６０より小さくなると外周壁
（11）の角部（12）および中心部（17）の肉厚が薄くな
り衝撃吸収力の増大が望めない。一方、Ｗ／３を超える
と厚肉になりすぎて初期荷重／平均荷重が高くなって、
衝撃吸収特性が低下する。中空部（14）の外周壁側角部
（15）の曲率半径（Ｒ１）の特に好ましい下限値は３mm
であり、特に好ましい上限値は７．５mmである。中心側
角部（16）の曲率半径（Ｒ２）の特に好ましい下限値は
２mmであり、特に好ましい上限値は５mmである。さら
に、これらの曲率半径の関係は、Ｒ１≧Ｒ２とすること
が好ましい。The radius of curvature (R1) of the corner (15) on the outer peripheral wall of the triangular hollow portion (14) and the corner on the center (1)
The curvature radius (R2) of 6) is W / 60 ≦ R1 ≦ W / 3, W / 6 with respect to the dimension (W) between the opposed outer peripheral walls.
It is preferable to satisfy 0 ≦ R2 ≦ W / 3. If the radii of curvature (R1) and (R2) are smaller than W / 60, the thickness of the corner (12) and the center (17) of the outer peripheral wall (11) becomes thin, and it is not possible to expect an increase in the shock absorbing power. On the other hand, if it exceeds W / 3, it becomes too thick and the initial load / average load increases,
Shock absorption characteristics decrease. The particularly preferable lower limit of the radius of curvature (R1) of the corner (15) on the outer peripheral wall side of the hollow portion (14) is 3 mm.
, And a particularly preferred upper limit is 7.5 mm. A particularly preferred lower limit of the radius of curvature (R2) of the central corner (16) is 2 mm, and a particularly preferred upper limit is 5 mm. Further, it is preferable that the relationship between these radii of curvature is R1 ≧ R2.
【００１８】また、外周壁（11）の角部（12）もまた、
軽量化を図りつつ衝撃吸収特性を向上させるために円弧
状に形成することが好ましく、その曲率半径（Ｒ３）は
０＜Ｒ３＜Ｗ／２の範囲に設定することが好ましい。曲
率半径（Ｒ３）＝０では円弧状にならず、一方Ｒ３＝Ｗ
／２では、断面が円形になり、外周壁（11）を多角形に
形成する意味がない。外周壁（11）の角部（12）の曲率
半径（Ｒ３）の特に好ましい下限値は５mmであり、特に
好ましい上限値は２０mmである。Also, the corner (12) of the outer peripheral wall (11)
In order to improve the shock absorption characteristics while reducing the weight, it is preferable to form the shape of an arc, and the radius of curvature (R3) is preferably set in the range of 0 <R3 <W / 2. When the radius of curvature (R3) = 0, it does not form an arc, while R3 = W
In the case of / 2, the cross section becomes circular and there is no point in forming the outer peripheral wall (11) in a polygonal shape. A particularly preferred lower limit of the radius of curvature (R3) of the corner (12) of the outer peripheral wall (11) is 5 mm, and a particularly preferred upper limit is 20 mm.
【００１９】さらに、前記衝撃吸収用多角形中空材
（１）は、軽量化を図るために材料としてアルミニウム
を用いることが好ましい。また、中桟を有し複雑な断面
形状の中空材であるから、このような複雑形状を精度良
く製造でき、かつ製造コストでも有利である押出材を利
用することが好ましい。具体的には、軽量でありかつ衝
撃吸収材としての強度を有すること、また押出性が良好
であるという諸条件より、ＪＩＳ ６０６５等の押出材
を推奨できる。Further, it is preferable that the shock absorbing polygonal hollow member (1) is made of aluminum in order to reduce the weight. Further, since it is a hollow material having a middle cross section and a complicated cross-sectional shape, it is preferable to use an extruded material which can manufacture such a complicated shape with high accuracy and is advantageous in manufacturing cost. Specifically, an extruded material such as JIS 6065 can be recommended from various conditions that it is lightweight, has strength as a shock absorbing material, and has good extrudability.
【００２０】なお、前記衝撃吸収用多角形中空材（１）
において、外周壁（11）の角部（12）を厚肉に形成する
と初期荷重／平均荷重が高くなる傾向があり、この比率
によっては衝撃吸収特性を低下させるおそれがある。こ
のような場合、衝撃吸収用多角形中空材（１）の圧縮方
向において、強度の低い部分を設け、その部分を起点と
して座屈変形を起こさせるようにすれば良い。このよう
な座屈変形の開始点となるトリガーを設けることによ
り、図４矢印ハに示すように初期荷重を下げることがで
きる。図１に示す実施形態では、外周壁（11）の側面に
周方向に長穴（20）を穿設し、これをトリガーとしてい
る。また、単に凹部を設ける設けるだけでも初期荷重を
下げることができる。The polygonal hollow material for shock absorption (1)
In this case, when the corner portion (12) of the outer peripheral wall (11) is formed to be thick, the initial load / average load tends to increase, and depending on this ratio, the shock absorption characteristics may be reduced. In such a case, a portion having low strength may be provided in the compression direction of the shock absorbing polygonal hollow member (1), and buckling deformation may be caused by using the portion as a starting point. By providing a trigger that is a starting point of such buckling deformation, the initial load can be reduced as shown by arrow C in FIG. In the embodiment shown in FIG. 1, an elongate hole (20) is formed in the side surface of the outer peripheral wall (11) in the circumferential direction, and this is used as a trigger. Also, the initial load can be reduced simply by providing the concave portion.
【００２１】[0021]
【実施例】次に、表１に示す寸法形状の衝撃吸収用多角
形中空材を作製した。前記衝撃吸収用多角形中空材は、
全てＪＩＳ ６０６５−Ｔ５材を材料として、所要断面
形状に押出して短尺に切断したものを試験材とした。ま
た、断面偶数角形の試験材については全ての角部と対向
する角部との間に中桟が形成されるものとし（図２参
照）、断面偶数角形の試験材については全ての角部と対
向直辺部との間に中桟を形成し、これらの中桟が中心部
で交差するように形成した（図３（Ａ））。また、トリ
ガーは外周壁各側面の上端から下方へ５mmの位置に幅
（周方向）２０mm×高さ（圧縮方向）３mmの穴を穿設す
るものとした。EXAMPLES Next, polygonal hollow materials for shock absorption having dimensions and shapes shown in Table 1 were produced. The polygonal hollow material for shock absorption,
All were made of JIS 6065-T5 material, extruded into a required cross-sectional shape and cut into short lengths to obtain test materials. In addition, it is assumed that a middle crosspiece is formed between all the corners and the opposing corners for a test material having an even-numbered cross section (see FIG. 2), and that all the corners are used for a test material having an even-numbered square cross section. A middle crosspiece was formed between the opposite direct sides, and the middle crosspieces were formed to intersect at the center (FIG. 3A). Further, the trigger was formed with a hole having a width of 20 mm (circumferential direction) × a height of 3 mm (compression direction) at a position 5 mm downward from the upper end of each side surface of the outer peripheral wall.
【００２２】製作した各衝撃吸収用多角形中空材につい
て、衝撃吸収試験を行い、平均荷重および衝撃吸収量／
断面積について相対的に評価した。評価結果を優れてい
るものから順に◎、○、△、×で表１に示す。Each of the manufactured polygonal hollow members for shock absorption was subjected to a shock absorption test, and the average load and the amount of shock absorption /
The cross-sectional area was relatively evaluated. The evaluation results are shown in Table 1 in the order of 優 れ, ○, △, and × from the superior one.
【００２３】[0023]
【表１】 表１の結果より、この発明の衝撃吸収用多角形中空材は
衝撃吸収量／断面積が高く、しかも相対的に初期荷重が
低く平均荷重が高いものであり、衝撃吸収特性が優れて
いることを確認した。[Table 1] From the results in Table 1, it can be seen that the polygonal hollow material for shock absorption of the present invention has a high shock absorption / cross-sectional area, a relatively low initial load, a high average load, and excellent shock absorption characteristics. It was confirmed.
【００２４】[0024]
【発明の効果】以上の次第で、この発明の衝撃吸収用多
角形中空材は、断面において、外周壁が四角形以上の多
角形であり、内部に、前記多角形の角部を一端とし多角
形の中心を通る中桟を有し、前記外周壁と中桟とで形成
される三角形中空部が形成されているから、断面積あた
りの衝撃吸収力が大きく、軽量性と優れた衝撃吸収特性
を兼備し、自動車のバンパー等に使用した場合、衝突時
の衝撃を効率良く吸収することができる。As described above, the polygonal hollow material for shock absorption according to the present invention has a polygonal outer peripheral wall having a rectangular shape or more in cross section. Has a middle crosspiece that passes through the center of the triangle, and has a triangular hollow portion formed by the outer peripheral wall and the middle crosspiece, so that the shock absorbing power per cross-sectional area is large, light weight and excellent shock absorbing characteristics. In addition, when used as a bumper or the like of an automobile, the impact at the time of collision can be efficiently absorbed.
【００２５】また、前記衝撃吸収用多角形中空材におい
て、前記外周壁の直辺部の肉厚（ｔ１）および中桟の肉
厚（ｔ２）は、それぞれ０．８〜１０mmである場合は、
特に軽量性と優れた衝撃吸収特性とをバランス良く兼備
する。In the shock absorbing polygonal hollow member, when the thickness (t1) of the right side of the outer peripheral wall and the thickness (t2) of the middle crosspiece are 0.8 to 10 mm, respectively:
In particular, it has a good balance between light weight and excellent shock absorption characteristics.
【００２６】また、前記三角形中空部の外周壁側角部お
よび中心側角部は円弧状に形成され、かつこれらの曲率
半径（Ｒ１）（Ｒ２）がＷ／６０≦Ｒ１≦Ｗ／３、Ｗ／
６０≦Ｒ２≦Ｗ／３（ただし、Ｒ１：中空部の外周壁側
角部の曲率半径、Ｒ２：中空部の中心側角部の曲率半
径、Ｗ：対向する外周壁間の寸法）の範囲内に設定され
ている場合、あるいは前記外周壁の角部は円弧状に形成
され、かつその曲率半径（Ｒ３）が０＜Ｒ３＜Ｗ／２
（ただし、Ｗ：対向する外周壁間の寸法）の範囲内に設
定されている場合は、断面積あたりの衝撃吸収力が大き
く、外周壁や中桟の肉厚を薄くしても優れた衝撃吸収特
性が得られる。The outer peripheral wall side corner and the center side corner of the triangular hollow portion are formed in an arc shape, and their radii of curvature (R1) and (R2) are W / 60 ≦ R1 ≦ W / 3, W /
60 ≦ R2 ≦ W / 3 (where R1: radius of curvature of the outer peripheral wall side corner of the hollow portion, R2: radius of curvature of the central side corner portion of the hollow portion, W: dimension between opposing outer peripheral walls) Or the corner of the outer peripheral wall is formed in an arc shape, and the radius of curvature (R3) is 0 <R3 <W / 2.
(However, when W is set within the range of the opposed outer peripheral wall), the impact absorbing power per cross-sectional area is large, and even when the outer peripheral wall and the middle crosspiece are thinned, excellent impact is achieved. Absorption characteristics are obtained.
【００２７】さらに、前記衝撃吸収用多角形中空材が、
アルミニウム押出材により形成されている場合は、軽量
性に優れ、かつ複雑な断面形状の中空材を精度良く製造
でき、かつ製造コストでも有利である。Further, the polygonal hollow material for shock absorption is
When it is formed of an extruded aluminum material, a hollow material having excellent lightness and a complicated cross-sectional shape can be manufactured with high accuracy, and the manufacturing cost is advantageous.
【図１】この発明の衝撃吸収用多角形中空材の一実施形
態を示す斜視図である。FIG. 1 is a perspective view showing one embodiment of a shock absorbing polygonal hollow member of the present invention.
【図２】図１のII−II断面図である。FIG. 2 is a sectional view taken along line II-II of FIG.
【図３】衝撃吸収材における一般的な荷重−変位曲線を
示すグラフである。FIG. 3 is a graph showing a general load-displacement curve of the shock absorbing material.
【図４】（Ａ）（Ｂ）は、奇数多角形中空材の一例を示
す断面図である。FIGS. 4A and 4B are cross-sectional views showing an example of an odd-numbered polygonal hollow member.
１…衝撃吸収用多角形中空材 11…外周壁 12…角部 13…中桟 14…中空部 15…外周壁側角部 16…中心側角部 18…直辺部 DESCRIPTION OF SYMBOLS 1 ... Polygon hollow material for shock absorption 11 ... Outer peripheral wall 12 ... Corner 13 ... Middle crossbar 14 ... Hollow part 15 ... Peripheral wall side corner 16 ... Center side corner 18 ... Right side
───────────────────────────────────────────────────── フロントページの続き (72)発明者 前野 肇 愛知県小牧市大字北外山字哥津3600番地 東海ゴム工業株式会社内 (72)発明者 浜野 秀光 堺市海山町６丁224番地 昭和アルミニウ ム株式会社内 (72)発明者 西川 直毅 堺市海山町６丁224番地 昭和アルミニウ ム株式会社内 (72)発明者 小久保 貞男 堺市海山町６丁224番地 昭和アルミニウ ム株式会社内 Ｆターム(参考） 3J066 AA02 AA23 BA03 BB01 BC01 BD07 BF02 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hajime Maeno 3600, Gezu, Kita-gaiyama, Komaki City, Aichi Prefecture Inside Tokai Rubber Industries Co., Ltd. (72) Inventor Hidemitsu Hamano 6, 224 Kaiyamacho, Sakai City Showa Aluminum (72) Inventor Naoki Nishikawa 6,224, Kaiyama-cho, Sakai City Showa Aluminum Co., Ltd. (72) Inventor Sadao Kokubo 6,224, Kaiyama-cho, Sakai City F-term in Showa Aluminum Co., Ltd. (Reference) 3J066 AA02 AA23 BA03 BB01 BC01 BD07 BF02
Claims (5)
上の多角形であり、内部に、前記多角形の角部（11）を
一端とし多角形の中心を通る中桟（13）を有し、前記外
周壁（11）と中桟（13）とで形成される三角形中空部
（14）が形成されていることを特徴とする衝撃吸収用多
角形中空材。In a cross section, an outer peripheral wall (11) has a polygonal shape of a quadrangle or more, and has a middle crosspiece (13) having a corner (11) of the polygon as one end and passing through the center of the polygon. A polygonal hollow material for shock absorption, wherein a triangular hollow portion (14) formed by the outer peripheral wall (11) and the middle crosspiece (13) is formed.
（ｔ１）および中桟（13）の肉厚（ｔ２）は、それぞれ
０．８〜１０mmである請求項１に記載の衝撃吸収用多角
形中空材。2. The thickness (t1) of the right side portion (18) of the outer peripheral wall (11) and the thickness (t2) of the middle crosspiece (13) are each 0.8 to 10 mm. The polygonal hollow material for shock absorption as described.
（15）および中心側角部（16）は円弧状に形成され、か
つこれらの曲率半径（Ｒ１）（Ｒ２）が Ｗ／６０≦Ｒ１≦Ｗ／３ Ｗ／６０≦Ｒ２≦Ｗ／３ ただし、Ｒ１：中空部の外周壁側角部の曲率半径 Ｒ２：中空部の中心側角部の曲率半径 Ｗ ：対向する外周壁間の寸法 の範囲内に設定されている請求項１または２に記載の衝
撃吸収用多角形中空材。3. An outer peripheral wall side corner (15) and a center side corner (16) of the triangular hollow portion (14) are formed in an arc shape, and their radii of curvature (R1) (R2) are W /. 60 ≦ R1 ≦ W / 3 W / 60 ≦ R2 ≦ W / 3 where R1: radius of curvature of the outer peripheral wall side corner of the hollow portion R2: radius of curvature of the central side corner portion of the hollow portion W: between opposing outer peripheral walls The impact-absorbing polygonal hollow material according to claim 1 or 2, wherein the polygonal hollow material is set within a range of:
に形成され、かつその曲率半径（Ｒ３）が ０＜Ｒ３＜Ｗ／２ ただし、Ｗ ：対向する外周壁間の寸法 の範囲内に設定されている請求項１〜３のいずれかに記
載の衝撃吸収用多角形中空材。4. A corner (12) of the outer peripheral wall (11) is formed in an arc shape and has a radius of curvature (R3) of 0 <R3 <W / 2, where W is a dimension between the opposing outer peripheral walls. The polygonal hollow material for shock absorption according to any one of claims 1 to 3, which is set in the range of:
ニウム押出材により形成されている請求項１〜４のいず
れかに記載の衝撃吸収用多角形中空材。5. The polygonal hollow material for shock absorption according to claim 1, wherein said polygonal hollow material for shock absorption is formed of an extruded aluminum material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30442899A JP2001124128A (en) | 1999-10-26 | 1999-10-26 | Polygonal hollow member for absorbing impact |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30442899A JP2001124128A (en) | 1999-10-26 | 1999-10-26 | Polygonal hollow member for absorbing impact |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001124128A true JP2001124128A (en) | 2001-05-08 |
Family
ID=17932894
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30442899A Pending JP2001124128A (en) | 1999-10-26 | 1999-10-26 | Polygonal hollow member for absorbing impact |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001124128A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003072588A (en) * | 2001-09-05 | 2003-03-12 | Honda Motor Co Ltd | Hollow member for car body frame |
| JP2008239083A (en) * | 2007-03-28 | 2008-10-09 | Hitachi Ltd | Transportation device |
| JP2008260531A (en) * | 2008-06-20 | 2008-10-30 | Hitachi Ltd | Collision collapsing structure of railroad vehicle structure |
| JP2008296716A (en) * | 2007-05-30 | 2008-12-11 | Kobe Steel Ltd | Energy absorbing member |
| JP2010249236A (en) * | 2009-04-15 | 2010-11-04 | Kobe Steel Ltd | Energy absorbing member |
| JP2012153254A (en) * | 2011-01-26 | 2012-08-16 | Showa Denko Kk | Shock absorbing member for vehicle |
| WO2013024883A1 (en) * | 2011-08-17 | 2013-02-21 | 昭和電工株式会社 | Shock absorbing member |
| CN103287369A (en) * | 2013-06-20 | 2013-09-11 | 湖南大学 | Multistage embedded type octagonal automobile energy absorbing and buffering device |
| CN103459239A (en) * | 2011-03-30 | 2013-12-18 | 新日铁住金株式会社 | Metallic hollow column-like member |
-
1999
- 1999-10-26 JP JP30442899A patent/JP2001124128A/en active Pending
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003072588A (en) * | 2001-09-05 | 2003-03-12 | Honda Motor Co Ltd | Hollow member for car body frame |
| JP2008239083A (en) * | 2007-03-28 | 2008-10-09 | Hitachi Ltd | Transportation device |
| JP2008296716A (en) * | 2007-05-30 | 2008-12-11 | Kobe Steel Ltd | Energy absorbing member |
| JP2008260531A (en) * | 2008-06-20 | 2008-10-30 | Hitachi Ltd | Collision collapsing structure of railroad vehicle structure |
| JP2010249236A (en) * | 2009-04-15 | 2010-11-04 | Kobe Steel Ltd | Energy absorbing member |
| JP2012153254A (en) * | 2011-01-26 | 2012-08-16 | Showa Denko Kk | Shock absorbing member for vehicle |
| CN103459239A (en) * | 2011-03-30 | 2013-12-18 | 新日铁住金株式会社 | Metallic hollow column-like member |
| WO2013024883A1 (en) * | 2011-08-17 | 2013-02-21 | 昭和電工株式会社 | Shock absorbing member |
| CN103890440A (en) * | 2011-08-17 | 2014-06-25 | 昭和电工株式会社 | Shock absorbing member |
| US20140292007A1 (en) * | 2011-08-17 | 2014-10-02 | Showa Denko K.K. | Shock absorbing member |
| JPWO2013024883A1 (en) * | 2011-08-17 | 2015-03-05 | 昭和電工株式会社 | Shock absorbing member |
| US9242612B2 (en) | 2011-08-17 | 2016-01-26 | Showa Denko K.K. | Shock absorbing member |
| EP2746614B1 (en) | 2011-08-17 | 2016-10-05 | Showa Denko K.K. | Shock absorbing member |
| CN103287369A (en) * | 2013-06-20 | 2013-09-11 | 湖南大学 | Multistage embedded type octagonal automobile energy absorbing and buffering device |
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