JP6613478B2

JP6613478B2 - Shock absorber for vehicle

Info

Publication number: JP6613478B2
Application number: JP2016050810A
Authority: JP
Inventors: 康夫今井; 豪太山根; 奕輝許; 督矢小林
Original assignee: Toyota Auto Body Co Ltd; Toyota Motor Corp
Current assignee: Toyota Auto Body Co Ltd; Toyota Motor Corp
Priority date: 2016-03-15
Filing date: 2016-03-15
Publication date: 2019-12-04
Anticipated expiration: 2036-03-15
Also published as: JP2017165185A

Description

この発明は、車両の例えばフロントバンパと車両ボディ前部との間に介装される衝撃吸収部材に関する。 The present invention relates to an impact absorbing member interposed between, for example, a front bumper and a vehicle body front portion of a vehicle.

車両のフロントバンパと車両ボディのフロントサイドメンバとの間に、クラッシュボックスと称される衝撃吸収部材を介装して、車両前突時等の衝撃をこの衝撃吸収部材を変形させることにより吸収する技術が提供されている。係る衝撃吸収部材に関する技術が下記の特許文献に開示されている。特許文献１には、ボックス本体が衝撃を受けて軸方向に変位（軸圧潰）する際に、側壁部の内側若しくは外側への変位を抑制して衝撃吸収能を高める技術が開示されている。特許文献２には、ボックス本体の側壁部間をリインフォースで相互に結合し、リインフォースの大きさや形状を適宜設定することにより衝撃吸収能をコントロールする技術が開示されている。 An impact absorbing member called a crash box is interposed between the front bumper of the vehicle and the front side member of the vehicle body, and the impact absorbing member is absorbed by deforming the impact absorbing member. Technology is provided. Techniques relating to such shock absorbing members are disclosed in the following patent documents. Japanese Patent Application Laid-Open No. 2004-260260 discloses a technology for improving the shock absorption capacity by suppressing the displacement of the side wall portion to the inside or the outside when the box main body receives an impact and is displaced in the axial direction (axial crushing). Patent Document 2 discloses a technique for controlling the shock absorbing capacity by connecting the side wall portions of the box body to each other by reinforcement and appropriately setting the size and shape of the reinforcement.

特許文献３には、ボックス後端を傾斜面に突き当てた状態で溶接することにより溶接位置を支点としたモーメントの発生を抑制し、これによりボックス本体の内側への座屈の発生を抑制して効率のよい軸圧縮変形を実現する技術が開示されている。特許文献４には、ボックス本体とバンパ骨格部材との間に断面コ字形に開いた補強部材を介在させ、これらの圧縮強度を適切に設定してボックス本体の設計の自由度を高める技術が開示されている。これら特許文献に開示されているようにこのの種の衝撃吸収部材について従来より様々な改良が施されている。 In Patent Document 3, welding is performed with the rear end of the box abutting against an inclined surface, thereby suppressing the generation of a moment with the welding position as a fulcrum, thereby suppressing the occurrence of buckling inside the box body. A technique for realizing efficient and efficient axial compression deformation is disclosed. Patent Document 4 discloses a technique in which a reinforcing member opened in a U-shaped cross section is interposed between a box body and a bumper skeleton member, and the compression strength is appropriately set to increase the degree of freedom in designing the box body. Has been. As disclosed in these patent documents, various improvements have been made to this type of impact absorbing member.

特開２０１３−１５４６６３号公報JP 2013-154663 A 特開２００９−２３４３７７号公報JP 2009-234377 A 特開２００８−９４２３６号公報JP 2008-94236 A 特開２００７−２８３８６８号公報JP 2007-283868 A

しかしながら、この種の衝撃吸収部材については、特にそのコンパクト化を図る上でさらに改良を施す必要があった。従来の一般的な衝撃吸収部材が図７に示されている。図７は、フロントバンパのリインフォース２とフロントサイドメンバ３との間に介在された衝撃吸収部材１を示している。一般に、この種の衝撃吸収部材１では、フロントバンパを経て入力される衝突エネルギーを効率よく吸収するため、フロントオーバーハングに相当する長さＬ₀は、長辺ａと短辺ｂに依存する軸圧潰波形の半波長（λ₀／２）の整数倍に設定される。このため、衝撃吸収部材１の長さＬ₀を軸圧潰波形の１波長λ₀に相当する９０ｍｍに設定した場合には効率のよい衝撃吸収がなされるが、例えば図８及び図９に示すように衝撃吸収部材１の長さＬ₀を例えば７０ｍｍに短縮すると、１波長λ₀に不足する部分は変形しないため、衝突エネルギーの吸収に寄与しなくなる。 However, this type of impact absorbing member has to be further improved particularly in order to make it compact. A conventional general shock absorbing member is shown in FIG. FIG. 7 shows the shock absorbing member 1 interposed between the front bumper reinforcement 2 and the front side member 3. In general, in this type of impact absorbing member 1, in order to efficiently absorb the collision energy input through the front bumper, the length L ₀ corresponding to the front overhang is an axis depending on the long side a and the short side b. It is set to an integral multiple of the half wavelength of the crushing wave (λ _0/2). For this reason, when the length L ₀ of the shock absorbing member 1 is set to 90 mm corresponding to one wavelength λ ₀ of the axial crushing waveform, efficient shock absorption is performed. For example, as shown in FIGS. If the length L ₀ of the shock absorbing member 1 is shortened to 70 mm, for example, the portion that is insufficient for one wavelength λ ₀ is not deformed, and thus does not contribute to the absorption of collision energy.

このように、従来軸圧潰波形の半波長（λ₀／２）の整数倍を設定するために長さＬ₀として少なくとも９０ｍｍを要していたため、効率のよい衝撃吸収能を確保しつつ長さＬ₀のコンパクト化を図ること困難であった。本発明は、係る従来の問題に鑑みてなされたもので、クラッシュボックスと称される衝撃吸収部材の衝撃吸収能を低下させることなく、その軸方向の長さ寸法を短縮化できるようにすることを目的とする。 Thus, half wavelength (λ _0/2) for which it takes at least 90mm an integer multiple as the length L ₀ in order to set, while ensuring good impact absorbency efficient length of the conventional shaft crushing waveform It was difficult to make L ₀ compact. The present invention has been made in view of the conventional problems, and it is possible to shorten the axial length of the shock absorbing member called a crash box without reducing the shock absorbing ability. With the goal.

上記の課題は下記の各発明により解決される。第１の発明は、車両のバンパリインフォースとサイドメンバとの間に介装されて、車両前後方向に潰れて衝撃を吸収する衝撃吸収部材である。第１の発明では、車両前後方向の一端側に設けたフランジ部をバンパリインフォースに結合させ、他端側に設けたフランジ部をサイドメンバに結合させて、当該衝撃吸収部材がバンパリインフォースとサイドメンバとの間に介装されている。第１の発明では、バンパリインフォース側のフランジ部と、サイドメンバ側のフランジ部の折り曲げ方向が相互に逆向きに設定されている。 Said subject is solved by each following invention. 1st invention is the impact-absorbing member which is interposed between the bumper reinforcement of a vehicle and a side member, and is crushed in the vehicle front-back direction and absorbs an impact. In the first invention, a flange portion provided on one end side in the vehicle front-rear direction is coupled to the bumper reinforcement, and a flange portion provided on the other end side is coupled to the side member. It is intervened between. In the first invention, the bending directions of the flange part on the bumper reinforcement side and the flange part on the side member side are set to be opposite to each other.

第１の発明によれば、車両衝突時等において、衝撃吸収部材が車両前後方向（軸方向）に潰れるように変形して衝撃が吸収される。この軸方向に潰れる軸圧潰（じくあっかい）時には、前端側と後端側に設けたフランジ部がその曲げ側へ変位するように当該衝撃吸収部材が変形する。第１の発明は係るフランジ結合による軸圧潰時の現象を利用してなされている。第１の発明では、バンパリインフォース側のフランジ部とサイドメンバ側のフランジ部の折り曲げ方向が相互に逆向きに設定されている。このため、当該衝撃吸収部材は、バンパリインフォース側とサイドメンバ側とで相互に逆方向へ膨らむように潰れる。 According to the first invention, the impact absorbing member is deformed so as to be crushed in the vehicle front-rear direction (axial direction) at the time of a vehicle collision or the like and the impact is absorbed. When the shaft is crushed in the axial direction, the shock absorbing member is deformed so that the flange portions provided on the front end side and the rear end side are displaced to the bending side. 1st invention is made | formed using the phenomenon at the time of the axial crushing by the flange connection which concerns. In the first invention, the bending directions of the flange part on the bumper reinforcement side and the flange part on the side member side are set to be opposite to each other. For this reason, the impact absorbing member is crushed so as to swell in opposite directions on the bumper reinforcement side and the side member side.

このように、当該衝撃吸収部材がその長手方向中央を境にして相互に逆方向に膨らむ（内側に膨らむ内凸と外側に膨らむ外凸）ことにより、当該衝撃吸収部材の前端から後端に至る全長の範囲内で軸圧潰波長の１波長を生成されやすくすることができる。一端から他端に至る全長の範囲内で軸圧潰波長の１波長が生成されるように潰れることから、全長にわたって潰れて効率よく衝撃が吸収される。第１の発明によれば、衝撃吸収部材の一端側から他端側に至る全長の範囲で強制的に軸圧潰波長が１波長生成されることから、従来のように軸方向の長さ寸法について制約を受けることなく効率のよい衝撃吸収を実現でき、ひいては従来よりも長さＬ₀が短い衝撃吸収部材で衝撃を効率よく吸収することができる。 In this way, the shock absorbing member swells in opposite directions with respect to the center in the longitudinal direction (inner convex bulging inward and outer convex bulging outward), so that the shock absorbing member reaches the rear end from the front end. One axial crushing wavelength can be easily generated within the entire length. Since it is crushed so that one wavelength of the axial crushing wavelength is generated within the entire length range from one end to the other end, the entire length is crushed and the impact is efficiently absorbed. According to the first invention, since one axial crushing wavelength is forcibly generated in the entire length range from one end side to the other end side of the shock absorbing member, the axial length dimension as in the prior art. Efficient impact absorption can be realized without being restricted, and as a result, an impact can be efficiently absorbed by an impact absorbing member having a length L ₀ shorter than that of the conventional one.

第２の発明は、第１の発明において、左右の側壁部と、上壁部と、底壁部を有する角型筒体形状を有しており、前記左右の側壁部の前側のフランジ部の折り曲げ方向と、前記上壁部と前記底壁部の前側のフランジ部の折り曲げ方向が相互に逆向きに設定された衝撃吸収部材である。 According to a second aspect of the present invention, in the first aspect of the invention, the right and left side wall portions, the upper wall portion, and the bottom wall portion have a rectangular cylindrical shape, and the front flange portion of the left and right side wall portions In the impact absorbing member, the bending direction and the bending direction of the flange portion on the front side of the upper wall portion and the bottom wall portion are set to be opposite to each other.

第２の発明によれば、左右側壁部の前側のフランジ部の折り曲げ方向と、上壁部と底壁部の前側のフランジ部の折り曲げ方向が相互に逆向きである結果、左右側壁部の前側の膨らみ方向と、上壁部と底壁部の前側の膨らみ方向が相互に逆方向になり、これによっても効率のよう衝撃吸収がなされる。 According to the second invention, the bending direction of the front flange portion of the left and right side wall portions and the bending direction of the front flange portion of the top wall portion and the bottom wall portion are opposite to each other. The bulge direction and the bulge directions on the front side of the upper wall portion and the bottom wall portion are opposite to each other, and this also absorbs the impact in an efficient manner.

第３の発明は、第１又は第２の発明において、左右の側壁部を備えた衝撃吸収部材である。第３の発明では、左右の側壁部の前端に左右相互に離間する外側へ折り曲げられた左右の前側フランジ部を備え、左右の側壁部の後端に左右相互に接近する内側へ折り曲げられた左右の後側フランジ部を備えた構成となっており、前側のフランジ部と後側のフランジ部の折り曲げ方向が相互に逆になっている。 A third invention is the shock absorbing member having left and right side walls in the first or second invention. In the third aspect of the invention, left and right front flange parts bent outwardly spaced apart from each other are provided at the front ends of the left and right side wall parts, and left and right side bent toward the inside approaching the left and right side walls from each other. The rear flange portion is configured such that the bending directions of the front flange portion and the rear flange portion are opposite to each other.

第３の発明によれば、左右の前側フランジ部が例えばバンパリインフォース側に結合され、左右の後側フランジ部が例えばサイドメンバ側に結合されて、当該衝撃吸収部材がバンパリインフォースとサイドメンバとの間に介装されている。この場合、バンパリインフォースを経て衝撃吸収部材に衝撃が入力されると、左右の側壁部はフランジ部をそれぞれ平板形に戻す方向に変位して当該衝撃吸収部材が潰れて衝撃が吸収される。これは、フランジ部の曲げを戻す方向の荷重の方が、曲げ角度をより大きくするための荷重よりも小さいという特性を利用している。このため、左右の側壁部の前側が相互に接近する方向（内側へ膨らむ方向）に変位し、後側が相互に離間する方向（外側へ膨らむ方向）に変位し、これにより左右の側壁部の全長について軸圧潰波長が強制的に１波長生成され、その結果衝撃吸収部材が全長にわたって効率よく潰れて衝撃が吸収される。 According to the third aspect of the invention, the left and right front flange portions are coupled to, for example, the bumper reinforcement side, the left and right rear flange portions are coupled to, for example, the side member side, and the shock absorbing member is connected to the bumper reinforcement and the side member. Intervened in between. In this case, when an impact is input to the impact absorbing member through the bumper reinforcement, the left and right side wall portions are displaced in a direction in which the flange portions are respectively returned to the flat plate shape, and the impact absorbing member is crushed to absorb the impact. This utilizes the characteristic that the load in the direction of returning the bending of the flange portion is smaller than the load for increasing the bending angle. For this reason, the front sides of the left and right side wall portions are displaced in a direction approaching each other (inwardly swelling direction), and the rear side is displaced in a direction separating from each other (inwardly swelling direction). The axial crushing wavelength is forcibly generated for, and as a result, the shock absorbing member is efficiently crushed over the entire length to absorb the shock.

第４の発明は、第１〜第３の何れか一つの発明において、上壁部と底壁部を備えた衝撃吸収部材である。第４の発明では、上壁部と底壁部の前端に上下相互に接近する内側へ折り曲げられた上下の前側フランジ部を備え、上壁部と底壁部の後端に上下相互に離間する外側へ折り曲げられた上下の後側フランジ部を備えた構成となっており、前側のフランジ部と後側のフランジ部の折り曲げ方向が相互に逆になっている。 4th invention is an impact-absorbing member provided with the upper wall part and the bottom wall part in any one of 1st-3rd invention. In the fourth invention, the front end of the upper wall portion and the bottom wall portion are provided with upper and lower front flange portions bent inwardly approaching each other, and are spaced apart from each other vertically at the rear ends of the upper wall portion and the bottom wall portion. The upper and lower rear flange portions are bent outward, and the bending directions of the front flange portion and the rear flange portion are opposite to each other.

第４の発明によれば、上下の前側フランジ部が例えばバンパリインフォース側に結合され、上下の後側フランジ部が例えばサイドメンバ側に結合されて、当該衝撃吸収部材がバンパリインフォースとサイドメンバとの間に介装されている。この場合、バンパリインフォースを経て衝撃吸収部材に衝撃が入力されると、フランジ部の上記特性により上壁部と底壁部はフランジ部をそれぞれ平板形に戻す方向に変位して当該衝撃吸収部材が潰れて衝撃が吸収される。このため、上壁部と底壁部の前側が相互に離間する方向（外側へ膨らむ方向）に変位し、後側が相互に接近する方向（内側へ膨らむ方向）に変位し、これにより上壁部と底壁部の全長について軸圧潰波長が強制的に１波長生成され、その結果衝撃吸収部材が全長にわたって効率よく潰れて衝撃が吸収される。 According to the fourth aspect of the invention, the upper and lower front flange portions are coupled to, for example, the bumper reinforcement side, the upper and lower rear flange portions are coupled to, for example, the side member side, and the shock absorbing member is connected to the bumper reinforcement and the side member. Intervened in between. In this case, when an impact is input to the impact absorbing member through the bumper reinforcement, the upper wall portion and the bottom wall portion are displaced in a direction to return the flange portion to the flat plate shape due to the above characteristics of the flange portion, and the impact absorbing member is It is crushed and the impact is absorbed. For this reason, the front side of the upper wall part and the bottom wall part is displaced in a direction separating from each other (inflating direction outward), and the rear side is displaced in a direction approaching each other (inward inflating direction), whereby the upper wall part For the entire length of the bottom wall, one axial crushing wavelength is forcibly generated, and as a result, the shock absorbing member is efficiently crushed over the entire length to absorb the shock.

第５の発明は、第１の発明において、左右の側壁部と、上壁部と、底壁部を有する角型筒体形状を有しており、左右の側壁部と、底壁部との間に跨ってビード部を配置した衝撃吸収部材である。 A fifth invention has a square cylindrical shape having left and right side walls, an upper wall, and a bottom wall in the first invention, and includes a left and right side wall and a bottom wall. This is an impact absorbing member having a bead portion disposed therebetween.

第５の発明によれば、左右側壁部の左右方向の変位及び上壁部と底壁部の上下方向の変位について、ビード部を配置した長手方向部位に、軸圧潰波長の頂部若しくは谷部（腹部）が生成されやすくなり、これにより当該衝撃吸収部材の全長（前端から後端に至る範囲）に軸圧潰波長の１波長を確実に生成できるようになる。ビード部は、左右の側壁部と上壁部との間に跨って配置しても同等の作用効果を得ることができる。 According to 5th invention, about the displacement of the horizontal direction of a left-right side wall part, and the displacement of the up-down direction of an upper wall part and a bottom wall part, in the longitudinal direction site | part which has arrange | positioned the bead part, the peak part or trough part ( An abdominal part) is easily generated, so that one axial crushing wavelength can be reliably generated over the entire length (range from the front end to the rear end) of the shock absorbing member. Even if the bead portion is disposed between the left and right side wall portions and the upper wall portion, the same effect can be obtained.

本実施形態に係る衝撃吸収部材及びその周辺の斜視図である。It is a perspective view of the impact-absorbing member and its periphery which concern on this embodiment. 本実施形態に係る衝撃吸収部材及びその周辺の分解斜視図である。It is a disassembled perspective view of the impact-absorbing member which concerns on this embodiment, and its periphery. 本実施形態に係る衝撃吸収部材の斜視図である。It is a perspective view of the impact-absorbing member which concerns on this embodiment. 本実施形態に係る衝撃吸収部材の横断面図である。It is a cross-sectional view of the impact absorbing member according to the present embodiment. 本実施形態に係る衝撃吸収部材の縦断面図である。It is a longitudinal cross-sectional view of the impact-absorbing member which concerns on this embodiment. 図５中(VI)部について別形態の縦断面図である。It is a longitudinal cross-sectional view of another form about the (VI) part in FIG. 従来の衝撃吸収部材の斜視図である。It is a perspective view of the conventional impact-absorbing member. 従来の衝撃吸収部材の横断面図である。It is a cross-sectional view of a conventional impact absorbing member. 従来の衝撃吸収部材の縦断面図である。It is a longitudinal cross-sectional view of the conventional impact-absorbing member.

次に、本発明の実施形態を図１〜図６に基づいて説明する。図中示した前後、左右、上下の各方向は、車両の前後、左右（車幅）、上下方向に一致している。図１及び図２に示すように本実施形態では、車両のフロントバンパとサイドメンバとの間に介装された左右の衝撃吸収部材のうち右側の衝撃吸収部材１０を図示して説明する。図示されていない左側の衝撃吸収部材についても同様に構成されている。また、車両の後側の衝撃吸収部材についても以下説明する構成を適用することができる。 Next, an embodiment of the present invention will be described with reference to FIGS. The front-rear, left-right, and up-down directions shown in the figure correspond to the front-rear, left-right (vehicle width), and up-down directions of the vehicle. As shown in FIGS. 1 and 2, in the present embodiment, the right shock absorbing member 10 among the left and right shock absorbing members interposed between the front bumper and the side member of the vehicle will be illustrated and described. The left shock absorbing member (not shown) is similarly configured. The configuration described below can also be applied to the impact absorbing member on the rear side of the vehicle.

クラッシュボックスとも称される衝撃吸収部材１０は、車両のフロントバンパのバンパリインフォース２と右側のサイドメンバ３との間に介装されている。衝撃吸収部材１０の前端がバンパリインフォース２に結合され、後端がサイドメンバ３に結合されている。例えば車両前突時等の衝撃がバンパリインフォース２を経てこの衝撃吸収部材１０に入力されると、当該衝撃吸収部材１０が車両前後方向（軸方向）に潰れることにより衝撃が吸収されて乗員の保護が図られる。 The shock absorbing member 10, also called a crash box, is interposed between the bumper reinforcement 2 of the vehicle front bumper and the right side member 3. The front end of the shock absorbing member 10 is coupled to the bumper reinforcement 2 and the rear end is coupled to the side member 3. For example, when an impact at the time of a vehicle front impact or the like is input to the impact absorbing member 10 through the bumper reinforcement 2, the impact absorbing member 10 is crushed in the vehicle front-rear direction (axial direction) to absorb the impact and protect the occupant. Is planned.

本実施形態の衝撃吸収部材１０の概要が図３に示されている。本実施形態の衝撃吸収部材１０は、左右の側壁部１１，１２と、上壁部１３と、底壁部１４と、取り付け壁部１７を有する角型筒体形状を有している。衝撃吸収部材１０は、Ｕ字形に折り曲げた鋼板の左右側部を左右の側壁部１１，１２とし、底部を底壁部１４としている。左右の側壁部１１，１２間には、リインフォース１５が結合されている。リインフォース１５は、矩形平板形状の鋼板の左右側部をそれぞれ上側へ折り曲げたもので、左右の折り曲げ部１５ａをそれぞれ左右の側壁部１１，１２の内面に当接させた状態で溶接により結合されている。リインフォース１５は、左右側壁部１１，１２間の上下方向ほぼ中程に結合されている。 An outline of the shock absorbing member 10 of the present embodiment is shown in FIG. The shock absorbing member 10 of the present embodiment has a rectangular cylindrical shape having left and right side wall portions 11, 12, an upper wall portion 13, a bottom wall portion 14, and a mounting wall portion 17. The shock absorbing member 10 has left and right side portions 11 and 12 as left and right side portions of a steel plate bent into a U-shape, and a bottom portion as a bottom wall portion 14. A reinforcement 15 is coupled between the left and right side wall portions 11 and 12. The reinforcement 15 is formed by bending the left and right side portions of a rectangular flat plate-shaped steel plate upward, and is joined by welding in a state where the left and right bent portions 15a are in contact with the inner surfaces of the left and right side wall portions 11 and 12, respectively. Yes. The reinforcement 15 is coupled approximately in the middle between the left and right side wall portions 11 and 12 in the vertical direction.

左右の側壁部１１，１２の前部には、それぞれ相互に離間する外側へＬ字形に折り曲げられてフランジ部１１ａ，１２ａが設けられている。両側壁部１１，１２の上部にも、それぞれ外側へＬ字形に折り曲げられてフランジ部１１ｂ，１２ｂが設けられている。上部側の両フランジ部１１ｂ，１２ｂ間に跨って上側の開口を塞ぐように上壁部１３が結合されている。左右の側壁部１１，１２の後部には、それぞれ相互に接近する内側へＬ字形に折り曲げられてフランジ部１１ｃ，１２ｃが設けられている。 The front portions of the left and right side wall portions 11 and 12 are respectively provided with flange portions 11a and 12a that are bent in an L shape outwardly from each other. Flange portions 11b and 12b are also provided on the upper portions of the side wall portions 11 and 12 by being bent outwardly in an L shape. The upper wall portion 13 is coupled so as to close the upper opening across the upper flange portions 11b and 12b. The rear portions of the left and right side wall portions 11 and 12 are provided with flange portions 11c and 12c that are bent in an L shape inwardly approaching each other.

上壁部１３の前部には、内側（下側）へＬ字形に折り曲げられてフランジ部１３ａが設けられている。上壁部１３の後部には、外側（上側）へＬ字形に折り曲げられてフランジ部１３ｂが設けられている。底壁部１４の前部には、内側（上側）へＬ字形に折り曲げられてフランジ部１４ａが設けられている。底壁部１４の後部には、外側（下側）へＬ字形に折り曲げられてフランジ部１４ｂが設けられている。取り付け壁部１７は、左右の側壁部１１，１２のフランジ部１１ｃ，１２ｃと上壁部１３のフランジ部１３ｂがスポット溶接により結合されて左右の側壁部１１，１２の後部に沿って結合されている。この取り付け壁部１７が４箇所でボルト締結されて当該衝撃吸収部材１がサイドメンバ３の前部に結合されている。なお、フランジ部の曲げ方向については、当該衝撃吸収部材１０が角型円筒形状を有することから当該円筒形状の外周側を外側、内周側を内側と言い、外側への折り曲げを外曲げ、内側への折り曲げを内曲げとも言う。 A flange portion 13a is provided at the front portion of the upper wall portion 13 by being bent in an L shape inward (lower side). A flange portion 13b is provided at the rear portion of the upper wall portion 13 by being bent outward (upward) into an L shape. A flange portion 14a is provided at the front portion of the bottom wall portion 14 and bent in an L shape toward the inside (upper side). A flange portion 14b is provided at the rear portion of the bottom wall portion 14 by being bent outwardly (lower side) in an L shape. The mounting wall portion 17 is formed by joining the flange portions 11c and 12c of the left and right side wall portions 11 and 12 and the flange portion 13b of the upper wall portion 13 by spot welding and joining along the rear portions of the left and right side wall portions 11 and 12. Yes. The mounting wall portion 17 is bolted at four locations, and the shock absorbing member 1 is coupled to the front portion of the side member 3. Regarding the bending direction of the flange portion, since the shock absorbing member 10 has a rectangular cylindrical shape, the outer peripheral side of the cylindrical shape is referred to as the outer side, the inner peripheral side is referred to as the inner side, and the outward bending is referred to as the outer bending. Bending to is also called internal bending.

このように、相互に対向する左右の側壁部１１，１２の前側のフランジ部１１ａ，１２ａの折り曲げ方向と後側のフランジ部１１ｃ，１２ｃの折り曲げ方向は、前者が外曲げであり、後者が内曲げである意味で相互に逆方向になっている。また、相互に対向する上壁部１３と底壁部１４のそれぞれの前側のフランジ部１３ａ，１４ａと、後側の底壁部１４の前側のフランジ部１４ａと後側のフランジ部１４ｂの折り曲げ方向についても、前者が内曲げで、後者が外曲げである意味で相互に逆方向になっている。 As described above, the bending direction of the front flange portions 11a and 12a and the bending direction of the rear flange portions 11c and 12c of the left and right side wall portions 11 and 12 facing each other are the former and the latter is the inner bending. In the sense of bending, they are opposite to each other. Further, the bending directions of the front flange portions 13a and 14a of the upper wall portion 13 and the bottom wall portion 14 facing each other, and the front flange portion 14a and the rear flange portion 14b of the rear bottom wall portion 14, respectively. As for, the former is inward bending and the latter is outward bending, meaning that they are opposite to each other.

左右の側壁部１１，１２の前側のフランジ部１１ａ，１２ａと、底壁部１４の前側のフランジ部１４ａがバンパリインフォース２に当接されて溶接により結合されている。また、左右側壁部１１，１２の後側のフランジ部１１ｃ，１２ｃが、サイドメンバ３の前部に当接されて溶接により結合されている。上壁部１３の後側のフランジ部１３ｂと、底壁部１４の後側のフランジ部１４ｂは、それぞれ２本のボルト３ａによりサイドメンバ３に結合されている。 The front flange portions 11a and 12a of the left and right side wall portions 11 and 12 and the front flange portion 14a of the bottom wall portion 14 are brought into contact with the bumper reinforcement 2 and joined by welding. Further, the rear flange portions 11c and 12c of the left and right side wall portions 11 and 12 are brought into contact with the front portion of the side member 3 and joined by welding. The rear flange portion 13b of the upper wall portion 13 and the rear flange portion 14b of the bottom wall portion 14 are coupled to the side member 3 by two bolts 3a, respectively.

左右の側壁部１１，１２と底壁部１４とにより形成される角部には、左右一対のビード部１６が設けられている。左右のビード部１６は、当該角部を局部的に内側へ盛り上がらせる方向に変形させて設けられている。 A pair of left and right bead portions 16 are provided at corners formed by the left and right side wall portions 11 and 12 and the bottom wall portion 14. The left and right bead portions 16 are provided so as to be deformed in a direction in which the corner portions are locally raised to the inside.

以上のように構成した本実施形態の衝撃吸収部材１０によれば、その前後方向の長さＬ₁を例えば約７０ｍｍに設定した場合にも効率のよい衝撃吸収がなされる。図４に示すようにバンパリインフォース２を経て衝撃吸収部材１０に衝撃Ｆが入力されると、その潰れる過程において左右の側壁部１１，１２は図中破線で示した長手方向中央を境にして前側は内側へ膨らむ方向に変位し、後側は外側へ膨らむ方向に変位する。これは、前側のフランジ部１１ａ，１２ａが外曲げであるので側壁部１１，１２の前側は両フランジ部１１ａ，１２ａの曲げを戻す方向である内側へ膨らみ、後側のフランジ部１１ｃ，１２ｃが内曲げであるので側壁部１１，１２の後側は同じく両フランジ部１１ｃ，１２ｃの曲げを戻す方向である外側へ膨らむ方向に変位する現象に拠る。 According to the impact absorbing member 10 of the present embodiment configured as described above, efficient impact absorption is achieved even when the length L ₁ in the front-rear direction is set to about 70 mm, for example. As shown in FIG. 4, when an impact F is input to the impact absorbing member 10 through the bumper reinforcement 2, the left and right side wall portions 11 and 12 are in front of the center in the longitudinal direction indicated by the broken line in the figure in the process of being crushed. Is displaced in the direction of swelling inward, and the rear side is displaced in a direction of swelling outward. This is because the front flange portions 11a and 12a are bent outwardly, the front sides of the side wall portions 11 and 12 swell inward, which is the direction to return the bending of both flange portions 11a and 12a, and the rear flange portions 11c and 12c Since it is inward bending, the rear side of the side wall parts 11 and 12 is also based on the phenomenon of displacing in the direction of bulging outward, which is the direction to return the bending of both flange parts 11c and 12c.

この点は、図５に示すように上壁部１３と底壁部１４についても同様で、その潰れる過程において上壁部１３と底壁部１４は図中破線で示した長手方向中央を境にして前側は外側へ膨らむ方向に変位し、後側は内側へ膨らむ方向に変位する。前側のフランジ部１３ａ，１４ａが内曲げであるので、上壁部１３と底壁部１４の前側は両フランジ部１３ａ，１４ａの曲げを戻す方向である外側に膨らみ、後側のフランジ部１３ｂ，１４ｂが外曲げであるので上壁部１３と底壁部１４の後側は両フランジ部１３ｂ，１４ｂの曲げを戻す方向となる内側へ膨らむ方向に変位する現象に拠る。 This also applies to the upper wall portion 13 and the bottom wall portion 14 as shown in FIG. 5, and in the process of being crushed, the upper wall portion 13 and the bottom wall portion 14 are bordered by the longitudinal center indicated by the broken line in the figure. The front side is displaced in the direction of swelling outward, and the rear side is displaced in the direction of swelling inward. Since the front flange portions 13a and 14a are inwardly bent, the front side of the upper wall portion 13 and the bottom wall portion 14 bulges outward to return the bending of both flange portions 13a and 14a, and the rear flange portion 13b and Since 14b is an outward bend, the rear side of the upper wall portion 13 and the bottom wall portion 14 is based on a phenomenon of displacement in a direction in which the flange portions 13b and 14b bulge inward, which is a direction to return the bend.

衝撃吸収部材１０の左右の側壁部１１，１２及び上壁部１３と底壁部１４がそれぞれその長手方向中央を境にして相互に逆方向に膨らむように潰れることにより、当該衝撃吸収部材１０の前端から後端に至る全長の範囲内で軸圧潰波長の１波長λ₁が過不足なく生成される。衝撃吸収部材１０がその一端から他端に至る全長の範囲内で軸圧潰波長の１波長λ₁が生成されるように潰れることから、当該衝撃吸収部材１０が全長にわたって潰れて効率よく衝撃Ｆが吸収される。なお、図４，５では、側壁部１１，１２及び上壁部１３と底壁部１４がそれぞれ矢印で示す方向に膨らんで細線で示す波形に変形した様子が示されている。この波形が軸圧潰波形Ｊに相当する。軸圧潰波形の１波長λ₁が当該衝撃吸収部材１０の前端から後端に至る全長の範囲内で過不足なく生成されている様子が示されている。 The left and right side walls 11 and 12 and the upper wall 13 and the bottom wall 14 of the shock absorbing member 10 are crushed so as to swell in opposite directions with respect to the center in the longitudinal direction. One wavelength λ ₁ of the axial crushing wavelength is generated without excess or deficiency within the entire length range from the front end to the rear end. Since the shock absorbing member 10 is crushed so that one wavelength λ ₁ of the axial crushing wavelength is generated within the entire length range from one end to the other end, the shock absorbing member 10 is crushed over the entire length and the impact F is efficiently generated. Absorbed. 4 and 5, the side wall portions 11 and 12, and the upper wall portion 13 and the bottom wall portion 14 swell in the directions indicated by the arrows and are deformed into waveforms indicated by thin lines. This waveform corresponds to the axial crush waveform J. It is shown that one wavelength λ ₁ of the axial crushing waveform is generated without excess or deficiency within the entire length range from the front end to the rear end of the shock absorbing member 10.

このように衝撃吸収部材１０の全長の範囲内で強制的に軸圧潰波長が過不足なく１波長λ₁生成されることから、従来のように軸方向の長さＬ₀について制約を受けることなく効率のよい衝撃吸収を実現できる。これにより、本実施形態の衝撃吸収部材１０によれば、衝撃吸収能を損なうことなくその長さ寸法を従来の９０ｍｍから７０ｍｍに短縮化して前後方向のコンパクト化を図ることができる。 As described above, since one axial wavelength λ ₁ is forcibly generated within the entire length of the shock absorbing member 10 without excessive or insufficient, there is no restriction on the axial length L ₀ as in the prior art. Efficient shock absorption can be realized. Thereby, according to the impact absorbing member 10 of the present embodiment, the length dimension can be shortened from the conventional 90 mm to 70 mm without impairing the impact absorbing capability, and the longitudinal compactness can be achieved.

この点、図７に示す従来の衝撃吸収部材１によれば、その左右の側壁部１ａ，１ｂ及び上壁部１ｃと底壁部１ｄの前端と後端をそれぞれ図８，９に示すようにバンパリインフォース２とサイドメンバ３に突き当てた状態で結合されていた。このため、前側から衝撃が入力されると、左右の側壁部１ａ，１ｂ及び上壁部１ｃと底壁部１ｄはそれぞれ細線で示すようにその前端から後端に至る全長の範囲内で軸圧潰波形Ｊの１／２波長λ₀を生成する必要上、当該衝撃吸収部材１の長さＬ₀を約９０ｍｍに設定する必要があり、その結果衝撃吸収能を損なうことなく、そのコンパクト化を図ることが困難であった。本実施形態に係る衝撃吸収部材１０によれば、前後で逆向きに折り曲げられたフランジ部を当接させて当該衝撃吸収部材１０を結合する構成とすることにより、軸圧潰波形Ｊを適切に制御することができ、これにより衝撃吸収能を低下させることなく当該衝撃吸収部材１０のコンパクト化を図ることができる。 In this regard, according to the conventional shock absorbing member 1 shown in FIG. 7, the left and right side walls 1a and 1b, the top wall 1c, and the front and rear ends of the bottom wall 1d are respectively shown in FIGS. The bumper reinforcement 2 and the side member 3 were in contact with each other. For this reason, when an impact is input from the front side, the left and right side walls 1a, 1b and the upper wall 1c and the bottom wall 1d are axially crushed within the entire length range from the front end to the rear end as indicated by thin lines. In order to generate the half wavelength λ ₀ of the waveform J, it is necessary to set the length L ₀ of the shock absorbing member 1 to about 90 mm, and as a result, it is possible to reduce the size without impairing the shock absorbing ability. It was difficult. According to the shock absorbing member 10 according to the present embodiment, the axial crushing waveform J is appropriately controlled by adopting a configuration in which the shock absorbing member 10 is coupled by abutting a flange portion bent in the opposite direction at the front and rear. Thus, the impact absorbing member 10 can be made compact without reducing the impact absorbing ability.

また、本実施形態によれば、左右の側壁部１１，１２と底壁部１４との角部に左右一対のビード部１６が設けられている。図４に示すようにビード部１６は、衝撃入力側（前側）の概ね１／４Ｌ₁の長さ位置に設けられている。このビード部１６によれば、軸圧潰波長の膨らみの頂部若しくは谷部の長手方向の位置を前側１／４の位置に設定しやすくなり、これにより当該衝撃吸収部材１０の全長において過不足なく軸圧潰波長の１波長λ₁をより確実に生成させることができるようになる。 Further, according to the present embodiment, the pair of left and right bead portions 16 are provided at the corner portions of the left and right side wall portions 11 and 12 and the bottom wall portion 14. As shown in FIG. 4, the bead portion 16 is provided at a length position of approximately ¼ L ₁ on the impact input side (front side). According to this bead part 16, it becomes easy to set the longitudinal position of the bulge of the bulge of the axial crushing wavelength to the position of the front side 1/4. One wavelength λ ₁ of the crushing wavelength can be generated more reliably.

以上説明した実施形態には種々変更を加えることができる。例えば、図６に示すように上壁部１３の前側のフランジ部１３ａを省略して、バンパリインフォース２側に設けたフランジ部２ａに対して結合する構成としてもよい。フランジ部１３ａを省略することにより、当該上壁部１３の前部のバンパリインフォース２に対する溶接作業の便宜を図ることができる。 Various modifications can be made to the embodiment described above. For example, as shown in FIG. 6, it is good also as a structure which abbreviate | omits the flange part 13a of the front side of the upper wall part 13, and couple | bond with the flange part 2a provided in the bumper reinforcement 2 side. By omitting the flange portion 13a, it is possible to facilitate the welding operation for the bumper reinforcement 2 at the front portion of the upper wall portion 13.

また、車両前側の衝撃吸収部材１０を例示したが、リヤバンパとサイドフレームとの間に介装する衝撃吸収部材について同様の構成を適用することができる。 Further, although the shock absorbing member 10 on the front side of the vehicle has been illustrated, the same configuration can be applied to the shock absorbing member interposed between the rear bumper and the side frame.

各フランジ部１１ａ，１２ａ、１１ｃ，１２ｃ、１３ａ，１４ａ、１３ｂ，１４ｂの折り曲げ方向は外側、内側で逆にしてもよい。結合用のフランジ部は、各壁部１１，１２，１３，１４について前後で逆向きとなる方向に折り曲げて設けることにより同様の作用効果を得ることができる。 The bending directions of the flange portions 11a, 12a, 11c, 12c, 13a, 14a, 13b, and 14b may be reversed on the outer side and the inner side. Similar effects can be obtained by providing the coupling flange portion by bending the wall portions 11, 12, 13, and 14 in opposite directions in the front-rear direction.

リインフォース１５若しくはビード部１６は省略することができる。 The reinforcement 15 or the bead portion 16 can be omitted.

１…衝撃吸収部材（従来）
１ａ…側壁部（左）、１ｂ…側壁部（右）、１ｃ…上壁部、１ｄ…底壁部
２…バンパリインフォース（フロント）
３…サイドメンバ（右側）
１０…衝撃吸収部材
１１…側壁部（左）
１１ａ…フランジ部（前）、１１ｂ…フランジ部（上）、１１ｃ…フランジ部（後）
１２…側壁部（右）
１２ａ…フランジ部（前）、１２ｂ…フランジ部（上）、１２ｃ…フランジ部（後）
１３…上壁部
１３ａ…フランジ部（前）、１３ｂ…フランジ部（後）
１４…底壁部
１４ａ…フランジ部（前）、１４ｂ…フランジ部（後）
１５…リインフォース、１５ａ…折り曲げ部
１６…ビード部
１７…取り付け壁部
Ｊ…軸圧潰波形
λ₀、λ₁…軸圧潰波形Ｊの波長
1 ... Shock absorbing member (conventional)
DESCRIPTION OF SYMBOLS 1a ... Side wall part (left), 1b ... Side wall part (right), 1c ... Upper wall part, 1d ... Bottom wall part 2 ... Bumper reinforcement (front)
3. Side member (right side)
10 ... Shock absorbing member 11 ... Side wall (left)
11a ... Flange (front), 11b ... Flange (upper), 11c ... Flange (rear)
12 ... Side wall (right)
12a ... Flange (front), 12b ... Flange (upper), 12c ... Flange (rear)
13 ... Upper wall part 13a ... Flange part (front), 13b ... Flange part (rear)
14 ... bottom wall part 14a ... flange part (front), 14b ... flange part (rear)
DESCRIPTION OF SYMBOLS 15 ... Reinforce, 15a ... Bending part 16 ... Bead part 17 ... Mounting wall part J ... Axial crushing waveform (lambda) ₀ , (lambda) ₁ ... Wavelength of axial crushing waveform J

Claims

An impact absorbing member that is interposed between the bumper reinforcement of the vehicle and the side member and crushed in the longitudinal direction of the vehicle to absorb the impact,
It has a square cylindrical shape with left and right side walls, an upper wall, and a bottom wall,
A flange portion provided on one end side in the vehicle front-rear direction is coupled to the bumper reinforcement, and a flange portion provided on the other end side is coupled to the side member, and is interposed between the bumper reinforcement and the side member. The bending direction of the flange part on the bumper reinforcement side and the bending direction of the flange part on the side member side are set opposite to each other , and the bending direction of the flange part on the front side of the left and right side wall parts, An impact absorbing member in which the bending direction of the flange portion on the front side of the wall portion and the bottom wall portion is set to be opposite to each other .

The shock absorbing member according to claim 1 , comprising left and right side wall portions, and having left and right front flange portions bent outwardly spaced apart from each other at the front ends of the left and right side wall portions, An impact-absorbing member comprising left and right rear flange portions bent inwardly approaching the left and right sides at the rear end of the side wall portion.

The shock absorbing member according to claim 1 or 2 , further comprising an upper wall portion and a bottom wall portion, wherein the upper and lower portions are bent inward so as to approach each other vertically at the front ends of the upper wall portion and the bottom wall portion. A shock absorbing member comprising an upper and lower rear flange portion that is bent outwardly spaced apart from each other at the rear ends of the upper wall portion and the bottom wall portion.

A shock absorbing member according to any one of claims 1 to 3, prior to SL and the right and left side wall portions, the shock-absorbing member disposed bead portions across between the bottom wall portion.