JP2003306171A - Front side member structure - Google Patents
Front side member structureInfo
- Publication number
- JP2003306171A JP2003306171A JP2002110654A JP2002110654A JP2003306171A JP 2003306171 A JP2003306171 A JP 2003306171A JP 2002110654 A JP2002110654 A JP 2002110654A JP 2002110654 A JP2002110654 A JP 2002110654A JP 2003306171 A JP2003306171 A JP 2003306171A
- Authority
- JP
- Japan
- Prior art keywords
- front side
- side member
- bent portion
- deformation
- section
- 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.)
- Granted
Links
Landscapes
- Body Structure For Vehicles (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、自動車のフロント
コンパートメントの車幅方向両側部に車体前後方向に延
在配置したフロントサイドメンバ構造に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a front side member structure which is disposed on both sides of a front compartment of an automobile in a vehicle width direction so as to extend in the vehicle front-rear direction.
【０００２】[0002]
【従来の技術】車両のフロントサイドメンバはフロント
コンパートメントの車幅方向両側部に車体前後方向に延
在配置され、閉断面を構成して車体前部の主要骨格を成
すととともに、前面衝突時に軸方向に圧壊して衝突エネ
ルギーを吸収する主要なエネルギー吸収部材としての機
能を有する。2. Description of the Related Art A front side member of a vehicle is arranged on both sides of a front compartment in the vehicle width direction so as to extend in the vehicle front-rear direction, forms a closed cross section to form a main skeleton of the front part of a vehicle, and also serves as a shaft for a frontal collision. It has a function as a main energy absorbing member that crushes in the direction and absorbs collision energy.
【０００３】前記フロントサイドメンバは、略直状のフ
ロント側のメンバ本体の後部からダッシュパネルのトー
ボードの傾斜面に沿って下方に屈曲した傾斜部に続いて
フロア下面に廻り込んでエクステンション部を形成した
構成となっているため、車両前方からの荷重がフロント
サイドメンバに軸方向に入力した場合に、ダッシュパネ
ルの傾斜面に沿った傾斜部が変形すると、ダッシュパネ
ルの後退変形量が大きくなってしまう可能性がある。The front side member is extended from the rear portion of the front side main body of the front member to an inclined portion which is bent downward along the inclined surface of the toe board of the dash panel and then extends around the lower surface of the floor to form an extension portion. Due to this configuration, when the load from the front of the vehicle is input to the front side member in the axial direction, if the inclined part along the inclined surface of the dash panel deforms, the amount of backward deformation of the dash panel increases. There is a possibility that
【０００４】そこで、前方からの荷重入力時にダッシュ
パネルが後退するのを抑制するために、フロントサイド
メンバの後部を補強することが考えられ、例えば、特開
平９−９５２６０号公報には、フロントサイドメンバの
メンバ本体の後部から傾斜部に至る領域でそれらの上面
を滑らかな湾曲面でつなぐリンフォースメント（補強部
材）によって補強する構造が開示されている。Therefore, in order to prevent the dash panel from retracting when a load is applied from the front, it is conceivable to reinforce the rear part of the front side member. For example, Japanese Patent Laid-Open No. 9-95260 discloses a front side member. There is disclosed a structure in which a member (reinforcement member) that connects upper surfaces of members in a region from a rear portion of a member main body to an inclined portion is connected with a smooth curved surface.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、このよ
うな補強構造ではフロントサイドメンバの後部全体の変
形が抑制されるため、ダッシュパネル前方でのフロント
サイドメンバの軸圧潰変形量が減少することになり、衝
突荷重が入力した場合には、却ってダッシュパネルのキ
ャビン側への後退変形量が大きくなる可能性があり、そ
こで、キャビンも補強する必要が生じて、車体重量の増
加や車体価格の上昇が余儀なくされてしまう。However, in such a reinforcing structure, the deformation of the entire rear portion of the front side member is suppressed, so that the axial crush deformation amount of the front side member in front of the dash panel is reduced. However, if a collision load is input, the amount of backward deformation of the dash panel toward the cabin side may be rather large.Therefore, it may be necessary to reinforce the cabin, resulting in an increase in vehicle weight and an increase in vehicle price. You will be forced to do so.
【０００６】一方、キャビン変形を抑制するための逆の
発想として、フロントサイドメンバを変形させ易くする
ことが考えられ、この場合のフロントサイドメンバ構造
としては、例えば、特開平１０−４５０２３号公報に開
示された断面矩形状の閉断面部材の外壁コーナー部の板
厚を薄肉形成したエネルギー吸収部材を適用することが
できる。On the other hand, as an opposite idea for suppressing the deformation of the cabin, it is considered that the front side member is easily deformed, and the structure of the front side member in this case is disclosed in, for example, Japanese Patent Laid-Open No. 10-45023. It is possible to apply the energy absorbing member in which the plate thickness of the outer wall corner portion of the disclosed closed cross-section member having a rectangular cross section is formed thin.
【０００７】ところが、このように外壁コーナー部を単
に薄肉化してフロントサイドメンバを形成した場合は、
ダッシュパネルの傾斜面に沿って下方に傾斜した傾斜部
のように曲げ入力を受ける部位では、衝突荷重が入力し
た場合に変形される断面の歪方向を特定することができ
ず、例えば、前記傾斜部の左，右縦壁が断面内方に変形
し、上，下壁が断面外方に変形した場合には、この傾斜
部の変形方向に対する断面二次モーメントが大きくなっ
てしまう。However, when the outer wall corner portion is simply thinned to form the front side member in this way,
In a portion that receives a bending input, such as an inclined portion that is inclined downward along the inclined surface of the dash panel, the strain direction of the cross section that is deformed when a collision load is input cannot be specified. When the left and right vertical walls of the section are deformed inward in the cross section and the upper and lower walls are deformed outward in the section, the second moment of area of the inclined section in the deformation direction becomes large.
【０００８】このため、フロントサイドメンバ後部の変
形が抑制されることになって、この場合にあってもダッ
シュパネルの後退変形量が増大される可能性があり、や
はりキャビンの補強を強いられることになる。Therefore, the deformation of the rear portion of the front side member is suppressed, and even in this case, there is a possibility that the amount of backward deformation of the dash panel may be increased and the cabin must be reinforced again. become.
【０００９】そこで、本発明は荷重入力時にフロントサ
イドメンバのメンバ本体と傾斜部との境の屈曲部の縦壁
を断面外方に変形させて断面二次モーメントを小さくす
ることにより、該屈曲部を積極的に変形させて荷重がダ
ッシュパネルに作用するのを抑制することができるフロ
ントサイドメンバ構造を提供するものである。Therefore, according to the present invention, when a load is input, the vertical wall of the bent portion at the boundary between the member main body of the front side member and the inclined portion is deformed outward in the cross section to reduce the second moment of area, thereby making the bent portion. The present invention provides a front side member structure capable of suppressing the load from acting on the dash panel by positively deforming the.
【００１０】[0010]
【課題を解決するための手段】請求項１の発明にあって
は、フロントコンパーメントの車幅方向両側部に車体前
後方向に延在配置され、後部にダッシュパネルの傾斜面
に沿った傾斜部を介してフロア下面に廻り込んだエクス
テンション部を形成した閉断面構造のフロントサイドメ
ンバ構造において、前記フロントサイドメンバのフロン
ト側のメンバ本体と傾斜部との境の屈曲部に、該屈曲部
の縦壁の断面外方への膨出変形を促す脆弱部を形成する
とともに、この屈曲部の前方に軸方向入力荷重に対して
前記縦壁の膨出変形を誘発する変形誘発手段を設ける一
方、前記傾斜部からエクステンション部に亘って変形抑
制手段を設けたことを特徴としている。According to the invention of claim 1, the front compartments are arranged to extend in the vehicle front-rear direction on both sides of the front compartment in the vehicle width direction, and the rear portion is provided with an inclined portion along the inclined surface of the dash panel. In a front side member structure having a closed cross-section structure in which an extension part is formed around the lower surface of the floor via the, a vertical part of the bent part is formed at the bent part at the boundary between the front side member body and the inclined part of the front side member. While forming a fragile portion that promotes bulging deformation of the wall outward in cross section, a deformation inducing means that induces bulging deformation of the vertical wall with respect to an axial input load is provided in front of the bent portion, and It is characterized in that the deformation suppressing means is provided from the inclined portion to the extension portion.
【００１１】請求項２の発明にあっては、請求項１に記
載のフロントサイドメンバ構造において、前記フロント
サイドメンバは、軽合金の鋳物によって断面Ｕ字状に形
成した下側部材と、この下側部材の上方開放部分を覆っ
て結合した軽合金の板材によって形成した上側部材とに
より閉断面に構成したことを特徴としている。According to a second aspect of the present invention, in the front side member structure according to the first aspect, the front side member includes a lower member formed in a U-shaped cross section by casting a light alloy, and the lower member. It is characterized in that a closed cross section is formed by an upper member formed of a light alloy plate material that is joined to cover the upper open portion of the side member.
【００１２】請求項３の発明にあっては、請求項２に記
載のフロントサイドメンバ構造において、前記下側部材
と上側部材とを少なくとも前記屈曲部において溶接して
結合し、この溶接部分を脆弱部の一部としたことを特徴
としている。According to a third aspect of the present invention, in the front side member structure according to the second aspect, the lower member and the upper member are welded and joined at least at the bent portion, and the welded portion is fragile. The feature is that it is a part of the section.
【００１３】請求項４の発明にあっては、請求項２，３
に記載のフロントサイドメンバ構造において、前記閉断
面としたフロントサイドメンバの下壁と縦壁との境の稜
線部の肉厚を少なくとも前記屈曲部において薄肉化し、
この薄肉の稜線部を脆弱部としたことを特徴としてい
る。According to the invention of claim 4, claims 2 and 3 are provided.
In the front side member structure according to, the wall thickness of the ridge line portion of the boundary between the lower wall and the vertical wall of the front side member having the closed cross section is thinned at least in the bent portion,
The thin ridge line portion is characterized as a weak portion.
【００１４】請求項５の発明にあっては、請求項２〜４
に記載のフロントサイドメンバ構造において、前記変形
誘発手段は、前記屈曲部の前部でフロントサイドメンバ
の閉断面を横断して一体に形成した横リブと、この横リ
ブの横断方向略中央部に結合して車体前方に延び、軸方
向入力荷重を該横リブに伝達する縦リブとにより構成し
たことを特徴としている。According to the invention of claim 5, claims 2 to 4 are provided.
In the front side member structure described in (1), the deformation inducing means is formed in a front portion of the bent portion so as to be integrally formed with a lateral rib that traverses a closed cross section of the front side member, and at a substantially central portion in the transverse direction of the lateral rib. It is characterized in that it is constituted by a vertical rib which is connected to extend in the front of the vehicle body and transmits an axial input load to the lateral rib.
【００１５】請求項６の発明にあっては、請求項２〜５
に記載のフロントサイドメンバ構造において、前記変形
抑制手段は、前記傾斜部からエクステンション部に亘っ
てそれらの対向する縦壁間を連結する複数のリブによっ
て構成したことを特徴としている。In the invention of claim 6, claims 2 to 5 are provided.
In the front side member structure described in (1), the deformation suppressing means is constituted by a plurality of ribs connecting between the facing vertical walls from the inclined portion to the extension portion.
【００１６】請求項７の発明にあっては、請求項２〜６
に記載のフロントサイドメンバ構造において、前記脆弱
部は、フロントサイドメンバの少なくとも上壁の前記屈
曲部に対応する位置に形成した伸び許容部を含むことを
特徴としている。In the invention of claim 7, claims 2 to 6 are provided.
In the front side member structure described in (1), the fragile portion includes an extension allowing portion formed at a position corresponding to at least the bent portion of the upper wall of the front side member.
【００１７】請求項８の発明にあっては、請求項１に記
載のフロントサイドメンバ構造において、前記フロント
サイドメンバの少なくとも屈曲部を含むフロント側のメ
ンバ本体を板材で形成し、かつ、前記脆弱部を、前記屈
曲部の下壁に縦壁よりも強度を高くするための第１補強
部材を設けて構成したことを特徴としている。According to an eighth aspect of the present invention, in the front side member structure according to the first aspect, the front side member body including at least the bent portion of the front side member is formed of a plate material, and the fragile member is formed. The portion is characterized in that a first reinforcing member for increasing the strength is provided on the lower wall of the bent portion as compared with the vertical wall.
【００１８】請求項９の発明にあっては、請求項８に記
載のフロントサイドメンバ構造において、前記変形誘発
手段を、屈曲部前方の対向する縦壁に断面内方に突出す
る湾曲部を形成し、この湾曲部の形成部分に沿った形状
の第２補強部材を設けるとともに、この第２補強部材を
前記湾曲部を跨いでその前後に結合することにより構成
したことを特徴としている。According to a ninth aspect of the present invention, in the front side member structure according to the eighth aspect, the deformation inducing means is formed with curved portions projecting inward in cross section on the vertical walls facing each other in front of the bent portion. A second reinforcing member having a shape along the curved portion is provided, and the second reinforcing member is formed by straddling the curved portion and connected to the front and rear of the curved portion.
【００１９】請求項１０の発明にあっては、請求項８，
９に記載のフロントサイドメンバ構造において、前記変
形抑制手段を、傾斜部からエクステンション部に亘って
それらの内周面に沿って嵌合配置した第３補強部材によ
り構成したことを特徴としている。According to the invention of claim 10, claim 8 and
The front side member structure described in Item 9 is characterized in that the deformation suppressing means is constituted by a third reinforcing member that is fitted and arranged along the inner peripheral surface of the inclined portion to the extension portion along the inner peripheral surface thereof.
【００２０】[0020]
【発明の効果】請求項１に記載の発明によれば、車両前
方からの荷重がフロントサイドメンバに入力すると、こ
のフロントサイドメンバの屈曲部の縦壁は、屈曲部前方
の変形誘発手段によって脆弱部を起点にして断面外方に
積極的に膨出変形する。According to the invention described in claim 1, when a load from the front of the vehicle is input to the front side member, the vertical wall of the bent portion of the front side member is weakened by the deformation inducing means in front of the bent portion. Starting from the part, it bulges and deforms positively outward in the cross section.
【００２１】このため、前記屈曲部は上下屈曲変形方向
に対して扁平となるように断面変形して断面二次モーメ
ントが小さくなるため、屈曲部をその屈曲方向に容易に
変形することができるとともに、変形抑制手段によって
ダッシュパネルに沿った傾斜部分が変形するのを効率良
く抑制することができる。Therefore, the bending portion is deformed in a cross section so as to be flat in the vertical bending deformation direction and the second moment of area is reduced, so that the bending portion can be easily deformed in the bending direction. The deformation suppressing unit can efficiently suppress the deformation of the inclined portion along the dash panel.
【００２２】従って、前方から入力する荷重がダッシュ
パネルに作用する前に屈曲部が変形し、この変形する屈
曲部によって荷重エネルギーを効果的に吸収することが
できるため、補強部材の増設等による車体重量の増大を
伴うことなくダッシュパネルの変形、ひいてはキャビン
の変形を効果的に抑制することができる。Therefore, the bent portion is deformed before the load input from the front acts on the dash panel, and the load energy can be effectively absorbed by the deformed bent portion. It is possible to effectively suppress the deformation of the dash panel and the deformation of the cabin without increasing the weight.
【００２３】請求項２に記載の発明によれば、請求項１
の発明の効果に加えて、フロントサイドメンバを軽合金
の鋳物で形成した下側部材と軽合金の板材からなる上側
部材との２部材で構成しているため、部品点数が少なく
組付工数を低減することができる。According to the invention of claim 2, claim 1
In addition to the effects of the present invention, since the front side member is composed of two members, a lower member made of a light alloy casting and an upper member made of a light alloy plate material, the number of parts is small and the assembly man-hour is reduced. It can be reduced.
【００２４】請求項３，４に記載の発明によれば、請求
項２の発明の効果に加えて、何れも脆弱部を容易に構成
できて屈曲部の変形を確実に行わせることができる。According to the third and fourth aspects of the invention, in addition to the effect of the second aspect of the invention, the fragile portion can be easily formed and the bent portion can be surely deformed.
【００２５】請求項５に記載の発明によれば、請求項２
〜４の発明の効果に加えて、フロントサイドメンバの前
端に入力した軸方向荷重を、縦リブと横リブとによって
屈曲部の縦壁の外方への変形荷重として良好に伝達でき
て、屈曲部の略扁平な断面変形をより積極的に誘発する
ことができる。According to the invention of claim 5, claim 2
In addition to the effects of the inventions of to 4, the axial load input to the front end of the front side member can be satisfactorily transmitted as an outward deformation load of the vertical wall of the bent portion by the vertical rib and the horizontal rib, and the bending can be performed. The substantially flat cross-section deformation of the part can be induced more positively.
【００２６】請求項６に記載の発明によれば、請求項２
〜５の発明の効果に加えて、変形抑制手段をリブ構造に
よって容易に構成することができる。According to the invention of claim 6, claim 2
In addition to the effects of the inventions of to 5, the deformation suppressing means can be easily configured by the rib structure.
【００２７】請求項７に記載の発明によれば、請求項２
〜６の発明の効果に加えて、屈曲部の上壁が脆弱部によ
って伸び変形するため、屈曲部の上下方向の屈曲変形を
よりスムーズに行わせることができる。According to the invention of claim 7, claim 2
In addition to the effects of the inventions of to 6, since the upper wall of the bent portion is stretched and deformed by the fragile portion, the bending deformation of the bent portion in the vertical direction can be performed more smoothly.
【００２８】請求項８に記載の発明によれば、請求項１
の発明の効果に加えて、フロントサイドメンバの板材構
成によって重量の増大化を回避することができる。According to the invention described in claim 8, claim 1
In addition to the effect of the invention described above, the increase in weight can be avoided by the plate material configuration of the front side member.
【００２９】請求項９に記載の発明によれば、請求項８
の発明の効果に加えて、湾曲部の形成により軸方向荷重
を屈曲部の縦壁に外方への変形荷重として良好に伝達で
きて、屈曲部の略扁平な断面変形をより積極的に誘発す
ることができる。According to the invention of claim 9, claim 8
In addition to the effect of the invention described above, by forming the curved portion, the axial load can be satisfactorily transmitted to the vertical wall of the bent portion as an outward deformation load, and the substantially flat cross-section deformation of the bent portion is more actively induced. can do.
【００３０】請求項１０に記載の発明によれば、請求項
８，９の発明の効果に加えて、変形抑制手段を第３補強
部材の嵌合配置によって容易に構成することができる。According to the tenth aspect of the invention, in addition to the effects of the eighth and ninth aspects of the invention, the deformation suppressing means can be easily constructed by the fitting arrangement of the third reinforcing member.
【００３１】[0031]
【発明の実施の形態】以下、本発明の実施形態を図面と
共に詳述する。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings.
【００３２】図１から図７は本発明にかかるフロントサ
イドメンバ構造の第１実施形態を示し、図１はフロント
サイドメンバの取り付け状態を示す側面図、図２はフロ
ントサイドメンバの分解斜視図、図３は図１中Ａ−Ａ線
に沿った拡大断面図、図４は図１中Ｂ−Ｂ線に沿った拡
大断面図、図５は図１中Ｃ−Ｃ線に沿った拡大断面図、
図６は図１中Ｄ−Ｄ線に沿った拡大断面図、図７は屈曲
部の変形状態を示す図４に対応する拡大断面図である。1 to 7 show a first embodiment of a front side member structure according to the present invention, FIG. 1 is a side view showing a mounted state of the front side member, and FIG. 2 is an exploded perspective view of the front side member. 3 is an enlarged sectional view taken along line AA in FIG. 1, FIG. 4 is an enlarged sectional view taken along line BB in FIG. 1, and FIG. 5 is an enlarged sectional view taken along line CC in FIG. ,
6 is an enlarged sectional view taken along the line D-D in FIG. 1, and FIG. 7 is an enlarged sectional view corresponding to FIG. 4 showing a deformed state of the bent portion.
【００３３】この第１実施形態のフロントサイドメンバ
１は、図１に示すようにフロントコンパートメントの車
幅方向両側部に車体前後方向に延在配置され、フロント
側の略直状のメンバ本体１Ａと、その後部に屈曲部１Ｂ
を境にダッシュパネル１０のトーボード部の傾斜面に沿
って下方に傾斜した傾斜部１Ｃと、該傾斜部１Ｃに続い
て、フロア１１の下面に廻り込んだエクステンション部
１Ｄとを備えた閉断面構造として構成されている。As shown in FIG. 1, the front side member 1 of the first embodiment is arranged to extend in the vehicle front-rear direction on both sides in the vehicle width direction of the front compartment, and has a substantially straight member body 1A on the front side. , Bent portion 1B at the rear
A closed cross-section structure including an inclined portion 1C that is inclined downward along the inclined surface of the toe board portion of the dash panel 10 and an extension portion 1D that wraps around the lower surface of the floor 11 following the inclined portion 1C. Is configured as.
【００３４】前記フロントサイドメンバ１は、メンバ本
体１Ａの部分で前後に２分割されて、前部を構成する前
方部材２と、後部を構成する下側部材３および上側部材
４とによって概略構成される。The front side member 1 is roughly divided into a front member 2 forming a front portion and a lower member 3 and an upper member 4 forming a rear portion, which is divided into two portions in the front and rear at a member main body 1A. It
【００３５】前記前方部材２はアルミ合金の押出し成形
により断面矩形状の直状閉断面に形成され、その前端に
は図外のバンパーレインフォースを取り付けるためのブ
ラケット２ａが結合され、この前方部材２は、前方から
の衝突荷重が入力された場合に軸方向に圧潰して衝突エ
ネルギーを吸収できるようになっている。The front member 2 is formed by extrusion molding an aluminum alloy into a straight closed cross section having a rectangular cross section, and a bracket 2a for mounting a bumper reinforcement (not shown) is joined to the front end of the front member 2. When the collision load from the front is input, the colloid is crushed in the axial direction and can absorb the collision energy.
【００３６】前記下側部材３は、軽合金としてのアルミ
合金の鋳物によって断面Ｕ字状に形成される一方、前記
上側部材４は同様にアルミ合金を素材とする板材によっ
て形成され、下側部材３の上方開放部分３ａを覆うよう
にして上側部材４を結合することにより閉断面構造に形
成される。The lower member 3 is formed of a cast aluminum alloy as a light alloy in a U-shaped cross section, while the upper member 4 is also formed of a plate material of aluminum alloy. The upper cross-section is formed by connecting the upper member 4 so as to cover the upper open portion 3a of the upper part 3.
【００３７】上側部材４の両側には下側部材３の両縦壁
３ｂ，３ｃの外側に嵌合する折曲部４ａ，４ｂが形成さ
れ、図３〜図５に示すようにこの折曲部４ａ，４ｂを下
側部材３の両縦壁３ｂ，３ｃの上端部に嵌合した状態
で、これら折曲部４ａ，４ｂと縦壁３ｂ，３ｃとを溶接
Ｗすることにより下側部材３と上側部材４とを一体化し
てある。Bent portions 4a and 4b are formed on both sides of the upper member 4 so as to fit outside the vertical walls 3b and 3c of the lower member 3, respectively. As shown in FIGS. By welding W between the bent portions 4a and 4b and the vertical walls 3b and 3c in a state where the upper and lower portions of the vertical walls 3b and 3c of the lower member 3 are fitted to the lower member 3, The upper member 4 is integrated.
【００３８】車幅方向外方に位置する前記折曲部４ｂの
前部は、図２に示すように上方に折曲されて上方折曲部
４ｂｆを形成するとともに、図３，図４に示すように下
側部材３の前端部から前記屈曲部１Ｂに亘って車幅方向
外方の縦壁３ｃが内方の縦壁３ｂよりも高く形成され、
この高い縦壁３ｃの内側に前記上方折曲部４ｂｆが嵌合
されて上方に突出し、この突出部分をストラットハウジ
ング１２にスポット溶接するようになっている。The front portion of the bent portion 4b located outward in the vehicle width direction is bent upward as shown in FIG. 2 to form an upper bent portion 4bf, and is also shown in FIGS. Thus, the vertical wall 3c on the outer side in the vehicle width direction is formed to be higher than the inner vertical wall 3b from the front end of the lower member 3 to the bent portion 1B.
The upper bent portion 4bf is fitted inside the tall vertical wall 3c and protrudes upward, and the protruding portion is spot-welded to the strut housing 12.
【００３９】ストラットハウジング１２は図外のサスペ
ンションのストラット（ショックアブソーバ）を支持
し、図１に示すようにこのストラットハウジング１２の
上端部がフードリッジメンバ１３に結合されている。The strut housing 12 supports a strut (shock absorber) of a suspension (not shown), and the upper end of the strut housing 12 is connected to the hood ridge member 13 as shown in FIG.
【００４０】そして、閉断面構造として互いに溶接Ｗし
た下側部材３と上側部材４との前端部には、図６に示す
ように前記前方部材２の後端部を差し込み、ボルト１
４，ナット１４ａを介して固定することにより前記フロ
ントサイドメンバ１を構成しており、このようにして構
成されたフロントサイドメンバ１の後端部のエクステン
ション部１Ｄは、図２に示すように車幅方向外方に折曲
して、フロア１１の左右両側に前後方向に延設したサイ
ドシル１５の前端部に直接結合してある。Then, as shown in FIG. 6, the rear end of the front member 2 is inserted into the front ends of the lower member 3 and the upper member 4 welded to each other as a closed cross-section structure, and the bolt 1
4, the front side member 1 is configured by being fixed via nuts 14a, and the extension portion 1D at the rear end of the front side member 1 configured in this manner is used as shown in FIG. It is bent outward in the width direction and is directly coupled to the front end portions of the side sills 15 extending in the front-rear direction on the left and right sides of the floor 11.
【００４１】尚、前記エクステンション部１Ｄの後端部
を直状にした場合は、この後端部と前記サイドシル１５
の前端部との間に車幅方向に図外のアウトリガーが介在
し、このアウトリガーを介して間接的に結合されること
になる。When the rear end portion of the extension portion 1D is made straight, the rear end portion and the side sill 15 are formed.
An outrigger (not shown) intervenes in the vehicle width direction between the front end of the vehicle and the front end of the vehicle and is indirectly coupled via the outrigger.
【００４２】ここで、本実施形態ではフロントサイドメ
ンバ１の屈曲部１Ｂに、この屈曲部１Ｂの縦壁３ｂ，３
ｃを断面外方への膨出変形を促す脆弱部２０を形成する
とともに、この屈曲部１Ｂの前方に後方への荷重入力に
対して前記縦壁３ｂ，３ｃの膨出変形を誘発する変形誘
発手段３０を設ける一方、前記傾斜部１Ｃからエクステ
ンション部１Ｄに亘って変形抑制手段４０を設けてあ
る。Here, in the present embodiment, the vertical walls 3b, 3 of the bent portion 1B are formed on the bent portion 1B of the front side member 1.
In addition to forming a fragile portion 20 that promotes bulging deformation of c toward the outside of the cross section, a deformation induction that induces bulging deformation of the vertical walls 3b and 3c in response to a load input to the front of the bent portion 1B to the rear. While the means 30 is provided, the deformation suppressing means 40 is provided from the inclined portion 1C to the extension portion 1D.
【００４３】前記脆弱部２０は、図４に示すように下側
部材３と上側部材４とを結合する溶接Ｗ部分と、閉断面
となったフロントサイドメンバ１の左右縦壁３ｂ，３ｃ
と下壁３ｄとの境の下部稜線部３ｅ，３ｆの肉厚を前記
屈曲部１Ｂにおいて薄肉化した薄肉稜線部２１，２２
と、フロントサイドメンバ１の少なくとも上壁４ｃの前
記屈曲部１Ｂに対応する位置に形成した伸び許容部とし
てのエンボス部２３と、の３つの構成要素によって構成
している。As shown in FIG. 4, the fragile portion 20 has a welded W portion connecting the lower member 3 and the upper member 4, and the left and right vertical walls 3b and 3c of the front side member 1 having a closed cross section.
Of the lower ridge line portions 3e and 3f at the boundary between the lower wall 3d and the lower wall 3d at the bent portion 1B.
And an embossed portion 23 as an extension permitting portion formed at a position corresponding to the bent portion 1B of at least the upper wall 4c of the front side member 1.
【００４４】即ち、脆弱部２０を構成する１つの構成要
素である溶接Ｗ部分は、溶接熱による影響で他部よりも
強度が低下された部分であり、この溶接Ｗを施した部位
が下側部材３の左右縦壁３ｂ，３ｃの上端部であるた
め、フロントサイドメンバ１の上部稜線部３ｇ，３ｈの
近傍の強度が局部的に低下されることになる。That is, the welded W portion, which is one of the constituent elements of the fragile portion 20, is a portion whose strength is lower than that of the other portion due to the influence of welding heat. Because of the upper end portions of the left and right vertical walls 3b, 3c of the member 3, the strength in the vicinity of the upper ridge portions 3g, 3h of the front side member 1 is locally reduced.
【００４５】また、脆弱部２０を構成する他の１つの構
成要素である薄肉稜線部２１，２２は、下部稜線部３
ｅ，３ｆの薄肉化によって強度を局部的に低下してい
る。In addition, the thin ridge line portions 21 and 22 which are another constituent element of the fragile portion 20 are the lower ridge line portions 3.
The strength is locally reduced due to the thinning of e and 3f.
【００４６】更に、脆弱部２０を構成する残りの構成要
素であるエンボス部２３は、上側部材４の上壁４ｃが前
記屈曲部１Ｂに対応する部位に略楕円形状に形成され
て、この上壁４ｃを下方に陥没加工し、屈曲部１Ｂの縦
壁３ｂ，３ｃが変形する際に前記エンボス部２３で伸び
変形を許容させて、縦壁３ｂ，３ｃの変形を積極的に行
わせるようになっている。Further, in the embossed portion 23, which is the remaining constituent element of the fragile portion 20, the upper wall 4c of the upper member 4 is formed in a substantially elliptical shape at a portion corresponding to the bent portion 1B. 4c is recessed downward, and when the vertical walls 3b and 3c of the bent portion 1B are deformed, the embossed portion 23 allows extensional deformation to positively deform the vertical walls 3b and 3c. ing.
【００４７】従って、車両前方からの衝突荷重Ｆがフロ
ントサイドメンバ１の前方から入力した際に、図４中２
点鎖線に示すように屈曲部１Ｂの左右縦壁３ｂ，３ｃは
前記脆弱部２０によって積極的に断面外方に膨出変形さ
れる。Therefore, when the collision load F from the front of the vehicle is input from the front of the front side member 1, 2 in FIG.
As shown by the dotted line, the left and right vertical walls 3b and 3c of the bent portion 1B are positively bulged and deformed outward in cross section by the fragile portion 20.
【００４８】前記変形誘発手段３０は、図２，図６に示
すように前記屈曲部１Ｂの直前部に位置してフロントサ
イドメンバ１の閉断面を横断して一体に形成した横リブ
３１と、この横リブ３１の横断方向略中央部に結合して
車体前方に延びる縦リブ３２とによって構成してある。As shown in FIGS. 2 and 6, the deformation inducing means 30 is located immediately in front of the bent portion 1B and is integrally formed with a lateral rib 31 which crosses the closed cross section of the front side member 1. The horizontal rib 31 is formed by a vertical rib 32 which is connected to a substantially central portion of the horizontal rib 31 in the transverse direction and extends forward of the vehicle body.
【００４９】尚、前記横リブ３１および前記縦リブ３２
の形成部分には、横リブ３１の前方に向かって所定間隔
をもって平行に他の副横リブ３１ａ，３１ｂが２条設け
られ、縦リブ３２は最前方の副横リブ３１ｂと前記変形
誘発手段３０として用いた横リブ３１とに亘って設けら
れる。Incidentally, the horizontal ribs 31 and the vertical ribs 32.
In the portion where the horizontal rib 31 is formed, two other sub-lateral ribs 31a and 31b are provided parallel to each other at a predetermined distance toward the front of the horizontal rib 31, and the vertical rib 32 is the frontmost sub-lateral rib 31b and the deformation inducing means 30. It is provided across the horizontal rib 31 used as.
【００５０】また、前記副横リブ３１ｂの前面には、下
側部材３と上側部材４との前部に差し込まれた前記前方
部材２の後端が当接して、この前方部材２に入力した前
方からの衝突荷重Ｆが、前記副横リブ３１ｂおよび前記
縦リブ３２を介して前記横リブ３１に作用するようにな
っている。Further, the rear end of the front member 2 inserted into the front portions of the lower member 3 and the upper member 4 is in contact with the front surface of the sub-lateral rib 31b, and the front member 2 is input. The collision load F from the front acts on the horizontal rib 31 via the sub-lateral rib 31b and the vertical rib 32.
【００５１】前記縦リブ３２と前記副横リブ３１ａとの
交差部には、中心孔３３ａを形成したボス部３３を形成
してある。A boss portion 33 having a central hole 33a is formed at the intersection of the vertical rib 32 and the sub-lateral rib 31a.
【００５２】前記変形抑制手段４０は、図２に示すよう
に前記傾斜部１Ｃからエクステンション部１Ｄに亘っ
て、それらの対向する縦壁３ｂ，３ｃ間を連結する複数
のリブ４１，４１…によって構成してある。As shown in FIG. 2, the deformation suppressing means 40 is constituted by a plurality of ribs 41, 41, ... Connecting the facing vertical walls 3b, 3c from the inclined portion 1C to the extension portion 1D. I am doing it.
【００５３】即ち、前記リブ４１，４１…は、鋳物によ
って下側部材３を形成する際に同時に形成されて、この
下側部材３の縦壁３ｂ，３ｃと下壁３ｄとに一体化さ
れ、下側部材３の傾斜部１Ｃからエクステンション部１
Ｄの区間に亘って複数のリブ４１，４１…が蛇腹状若し
くは変則的な蛇腹状に立設配置され、前方からの荷重Ｆ
に対して傾斜部１Ｃの剛性を確保して容易に変形しない
ようになっている。That is, the ribs 41, 41, ... Are formed at the same time when the lower member 3 is formed by casting, and are integrated with the vertical walls 3b, 3c and the lower wall 3d of the lower member 3, From the inclined portion 1C of the lower member 3 to the extension portion 1
A plurality of ribs 41, 41 ... Are erected upright in a bellows-like or irregular bellows-like manner over a section D, and a load F from the front is applied.
On the other hand, the rigidity of the inclined portion 1C is ensured so that it is not easily deformed.
【００５４】以上の構成により第１実施形態のフロント
サイドメンバ構造にあっては、前面衝突により前方から
衝突荷重Ｆがフロントサイドメンバ１に入力し、前方部
材２の軸圧潰が略終了して後部への伝達荷重Ｆが大きく
なると、まず、この荷重Ｆが屈曲部１Ｂの前方に設けた
変形誘発手段３０の縦リブ３２に入力して、図６中２点
鎖線に示すように横リブ３１の中央部を後方に変形させ
るため、屈曲部１Ｂの縦壁３ｂ，３ｃの前側部分を断面
外方に押し拡げようとするモーメントＭが発生する。In the front side member structure of the first embodiment having the above-described structure, the collision load F is input to the front side member 1 from the front due to the frontal collision, and the axial crushing of the front member 2 is substantially completed, and the rear portion is rear-parted. When the transmission load F to the bending rib 1 increases, the load F is first input to the vertical ribs 32 of the deformation inducing means 30 provided in front of the bent portion 1B, and the horizontal ribs 31 of the horizontal ribs 31 as shown by the two-dot chain line in FIG. Since the central portion is deformed rearward, a moment M that tends to push the front portions of the vertical walls 3b and 3c of the bent portion 1B outward in the cross section is generated.
【００５５】このとき、前記屈曲部１Ｂには、上部稜線
部３ｇ，３ｈの近傍に施した溶接Ｗと、下部稜線部３
ｅ，３ｆの薄肉稜線部２１，２２と、上側部材４の上壁
４ｃに形成したエンボス部２３と、からなる脆弱部２０
を設けてあるので、屈曲部１Ｂは前記モーメントＭによ
り変形が誘発されて縦壁３ｂ，３ｃは断面外方に膨出変
形することになり、屈曲部１Ｂは図１中２点鎖線に示す
変形方向（屈曲部１Ｂの屈曲方向）に対して、図４，図
７中２点鎖線に示すように扁平となる方向に断面変形す
るため、この屈曲部１Ｂの断面二次モーメントは小さく
なる。At this time, in the bent portion 1B, the welding W applied in the vicinity of the upper ridge portions 3g and 3h and the lower ridge portion 3 are formed.
A fragile portion 20 including thin ridgeline portions 21 and 22 of e and 3f and an embossed portion 23 formed on the upper wall 4c of the upper member 4.
Since the bending portion 1B is deformed by the moment M, the vertical walls 3b and 3c are bulged and deformed outward in the cross section, and the bending portion 1B is deformed as shown by a two-dot chain line in FIG. Since the cross-section is deformed in a flattening direction with respect to the direction (the bending direction of the bent portion 1B) as shown by the chain double-dashed line in FIGS. 4 and 7, the second moment of area of the bent portion 1B becomes small.
【００５６】このように屈曲部１Ｂの断面二次モーメン
トが小さくなることによりこの屈曲部１Ｂの屈曲方向の
曲げ変形が積極的に行われ、これによってフロントサイ
ドメンバ１の後部に伝達される衝突エネルギーを効果的
に吸収することができる。By thus reducing the second moment of area of the bent portion 1B, the bending deformation of the bent portion 1B in the bending direction is positively performed, whereby the collision energy transmitted to the rear portion of the front side member 1 is generated. Can be effectively absorbed.
【００５７】ところで、本実施形態では前記脆弱部２０
を溶接Ｗ、薄肉稜線部２１，２２およびエンボス部２３
の３つの構成要素を設けて構成したので、それぞれの構
成要素が屈曲部１Ｂの縦壁３ｂ，３ｃの膨出変形をより
確実かつ容易に行わせることができるが、このように全
ての構成要素によって脆弱部２０を構成することなく、
各構成要素の少なくとも１つで脆弱部２０を構成するこ
ともできる。By the way, in this embodiment, the fragile portion 20 is used.
Welding W, thin-walled ridge portions 21, 22 and embossed portion 23
Since each of the three constituent elements is provided, the respective constituent elements can cause the vertical walls 3b and 3c of the bent portion 1B to bulge and deform more reliably and easily. Without configuring the fragile portion 20 by
The fragile portion 20 can also be configured by at least one of each component.
【００５８】また、このように屈曲部１Ｂが積極的に変
形して衝突エネルギーを吸収できることと相俟って、フ
ロントサイドメンバ１の傾斜部１Ｃにはリブ４１，４１
…を設けて変形抑制手段４０を構成してあるので、前記
衝突荷重Ｆによって傾斜部１Ｃが変形するのを抑制し、
ひいては、ダッシュパネル１０の車体後方への変形を防
止若しくは抑制できるため、キャビン変形を効果的に防
止することができる。In addition to the fact that the bent portion 1B is positively deformed and can absorb the collision energy as described above, the ribs 41, 41 are provided on the inclined portion 1C of the front side member 1.
.. are provided to configure the deformation suppressing means 40, the deformation of the inclined portion 1C due to the collision load F is suppressed,
As a result, the deformation of the dash panel 10 toward the rear of the vehicle body can be prevented or suppressed, so that the deformation of the cabin can be effectively prevented.
【００５９】更に、本実施形態ではこのように前面衝突
時のキャビン変形を防止できるため、フロントサイドメ
ンバ１やダッシュパネル１０あるいはフロア１１に多く
の補強部材を設ける必要が無くなるため、車体重量の増
加を抑制することができる。Further, in this embodiment, since the deformation of the cabin at the time of a frontal collision can be prevented as described above, it is not necessary to provide many reinforcing members on the front side member 1, the dash panel 10 or the floor 11, so that the weight of the vehicle body is increased. Can be suppressed.
【００６０】図８〜図１３は本発明の第２実施形態を示
し、前記第１実施形態と同一構成部分に同一符号を付し
て重複する説明を省略して述べる。8 to 13 show a second embodiment of the present invention, and the same components as those of the first embodiment will be designated by the same reference numerals and overlapping description will be omitted.
【００６１】図８はフロントサイドメンバの取り付け状
態を示す側面図、図９はフロントサイドメンバの分解斜
視図、図１０は図８中Ｅ−Ｅ線に沿った拡大断面図、図
１１は図８中Ｆ−Ｆ線に沿った拡大断面図、図１２は図
８中Ｇ−Ｇ線に沿った拡大断面図、図１３は図８中Ｈ−
Ｈ線に沿った拡大断面図である。FIG. 8 is a side view showing a mounting state of the front side member, FIG. 9 is an exploded perspective view of the front side member, FIG. 10 is an enlarged sectional view taken along line EE in FIG. 8, and FIG. 11 is FIG. 8 is an enlarged cross-sectional view taken along line FF in FIG. 8, FIG. 12 is an enlarged cross-sectional view taken along line GG in FIG. 8, and FIG.
It is an expanded sectional view along the H line.
【００６２】この第２実施形態のフロントサイドメンバ
１００は、前記第１実施形態と同様に図８に示すよう
に、フロントコンパートメントの車幅方向両側部に車体
前後方向に延在配置され、フロント側の略直状のメンバ
本体１００Ａと、その後部に屈曲部１００Ｂを境にダッ
シュパネル１０のトーボード部の傾斜に沿って下方に傾
斜した傾斜部１００Ｃと、該傾斜部１００Ｃに続いてフ
ロア１１の下面に廻り込んだエクステンション部１００
Ｄを備えた閉断面構造として構成されている。Similar to the first embodiment, the front side member 100 of the second embodiment is arranged so as to extend in the vehicle front-rear direction on both sides in the vehicle width direction of the front compartment, as shown in FIG. Of the substantially straight member main body 100A, an inclined portion 100C which is inclined downward along the inclination of the toe board portion of the dash panel 10 at the rear of the bent portion 100B, and the lower surface of the floor 11 following the inclined portion 100C. Extension part 100 wrapped around
It is configured as a closed cross-section structure including D.
【００６３】前記フロントサイドメンバ１００は、板材
を折曲加工して互いに結合することにより構成されてお
り、その主たる構成部材としては断面コ字状のサイド部
材１０１と、このサイド部材１０１の開放部分１０１ａ
を閉止する帯状平板の閉止部材１０２と、断面Ｕ字状の
後方傾斜部材１０３とを備えている。The front side member 100 is constructed by bending plate members and connecting them to each other. The main components of the front side member 100 are a side member 101 having a U-shaped cross section, and an open portion of the side member 101. 101a
It includes a strip-shaped plate closing member 102 for closing and a rearward tilting member 103 having a U-shaped cross section.
【００６４】前記サイド部材１０１は、図９に示すよう
に車幅方向外方（図中右方）が開放される断面コ字状に
形成され、このサイド部材１０１の開放部分１０１ａの
上下端部を上下外方に折曲形成して、前記閉止部材１０
２を結合するためのフランジ１０１ｂ，１０１ｃを設け
てある。As shown in FIG. 9, the side member 101 is formed in a U-shape in cross section so that the outer side in the vehicle width direction (the right side in the figure) is opened, and the upper and lower ends of the open portion 101a of the side member 101. Is bent upward and downward to form the closing member 10
Flanges 101b and 101c for connecting the two are provided.
【００６５】そして、それらフランジ１０１ｂ，１０１
ｃに平板帯状の閉止部材１０２の上下端部をスポット溶
接することにより、サイド部材１０１と閉止部材１０２
との結合体が閉断面を構成するようにしている。Then, the flanges 101b, 101
The upper and lower end portions of the flat belt-shaped closing member 102 are spot-welded to c, so that the side member 101 and the closing member 102
The combination of and forms a closed cross section.
【００６６】前記サイド部材１０１と前記閉止部材１０
２は、前方（図中手前側）から入力する衝突荷重によっ
て積極的に軸圧潰される前部Ｆｒと、前記後方傾斜部材
１０３に結合される後部Ｒｒとを一体に形成してあり、
それぞれの前部Ｆｒに薄肉板材を用いるとともに、後部
Ｒｒに厚肉板材を用いて、それぞれの薄肉板材と厚肉板
材をレーザー溶接などにより接合したブランク材をプレ
ス成形して前記サイド部材１０１および前記閉止部材１
０２が形成される。The side member 101 and the closing member 10
Reference numeral 2 integrally forms a front portion Fr that is axially crushed by a collision load input from the front (the front side in the drawing) and a rear portion Rr that is coupled to the rear tilt member 103.
A thin plate material is used for each front portion Fr, and a thick plate material is used for the rear portion Rr. A blank material obtained by joining the thin plate material and the thick plate material by laser welding or the like is press-formed to form the side member 101 and the side member. Closing member 1
02 is formed.
【００６７】前記後方傾斜部材１０３は上方が開放部分
１０３ａとなる断面Ｕ字状に形成され、この後方傾斜部
材１０３の前半部分を、図１０に示すように閉断面に結
合した前記サイド部材１０１と前記閉止部材１０２の後
部Ｒｒの下側にスポット溶接して結合してある。The rear tilting member 103 is formed in a U-shaped cross-section having an open portion 103a at the top, and the front half of the rear tilting member 103 is connected to the side member 101 in a closed cross section as shown in FIG. It is connected by spot welding to the lower side of the rear portion Rr of the closing member 102.
【００６８】このとき、サイド部材１０１の側壁と閉止
部材１０２が屈曲部１００Ｂの両縦壁１０１ｄ，１０２
ａとなる（図１１参照）。At this time, the side wall of the side member 101 and the closing member 102 are the vertical walls 101d and 102 of the bent portion 100B.
a (see FIG. 11).
【００６９】また、前記後方傾斜部材１０３は、その開
放部分１０３ａの両側部分に設けたフランジ１０３ｂ，
１０３ｃを、図１２に示すようにダッシュパネル１０に
スポット溶接することにより閉断面構造として構成され
る。The rearward tilting member 103 has flanges 103b provided on both sides of the open portion 103a.
As shown in FIG. 12, 103 c is spot-welded to the dash panel 10 to form a closed cross-section structure.
【００７０】この第２実施形態にあってもフロントサイ
ドメンバ１００のダッシュパネル１０の傾斜面に沿った
屈曲部１００Ｂに、この屈曲部１００Ｂの前記縦壁１０
１ｄ，１０２ａの断面外方への膨出変形を許容する脆弱
部１１０を形成するとともに、この屈曲部１００Ｂの前
方にこの屈曲部１００Ｂの縦壁１０１ｄ，１０２ａの膨
出変形を誘発する変形誘発手段１２０を設ける一方、前
記傾斜部１００Ｃからエクステンション部１００Ｄに亘
って変形抑制手段１３０を設けてある。Also in the second embodiment, the vertical wall 10 of the bent portion 100B is provided at the bent portion 100B along the inclined surface of the dash panel 10 of the front side member 100.
Deformation-inducing means for forming a fragile portion 110 that allows bulging deformation of 1d, 102a outward in cross section and for bulging deformation of the vertical walls 101d, 102a of the bending portion 100B in front of the bending portion 100B. While 120 is provided, deformation suppressing means 130 is provided from the inclined portion 100C to the extension portion 100D.
【００７１】前記脆弱部１１０は、図９，図１１に示す
ように前記屈曲部１００Ｂの下壁１０３ｄに、前記縦壁
１０１ｄ，１０２ａよりも強度を高くするための第１補
強部材としての第１レインフォース１１１を設けて構成
してある。As shown in FIGS. 9 and 11, the fragile portion 110 has a lower wall 103d of the bent portion 100B which is a first reinforcing member for increasing the strength of the fragile portion 110, as compared with the vertical walls 101d and 102a. A reinforcement 111 is provided and configured.
【００７２】この第１レインフォース１１１は、後述す
る第３レインフォース１３１と一体に形成されており、
その詳細は第３レインフォース１３１の説明と併せて後
述するものとする。The first reinforcement 111 is formed integrally with a third reinforcement 131 described later,
The details will be described later together with the description of the third reinforcement 131.
【００７３】前記変形誘発手段１２０は、図９，図１０
に示すように屈曲部１００Ｂの前方の対向する縦壁１０
１ｄ，１０２ａにそれぞれ断面内方に突出する湾曲部１
２１，１２１ａを形成する一方、これら湾曲部１２１，
１２１ａの形成部分の内面形状に沿った形状の第２補強
部材としての第２レインフォース１２２を設けるととも
に、この第２レインフォース１２２を前記湾曲部１２
１，１２１ａを跨いでそれらの前後にスポット溶接によ
り結合することにより構成してある。The deformation inducing means 120 is shown in FIGS.
As shown in FIG.
Curved parts 1 projecting inward in cross sections 1d and 102a, respectively
21 and 121a, the curved portions 121,
The second reinforcement 122 is provided as a second reinforcing member having a shape that conforms to the inner surface shape of the portion where the 121a is formed, and the second reinforcement 122 is provided in the curved portion 12.
1, 121a is straddled and is connected by front and rear of them by spot welding.
【００７４】即ち、前記第２レインフォース１２２は、
サイド部材１０１の内側に沿った略Ｕ字状に折曲形成さ
れ、その片壁１２２ａの中央部に前記湾曲部１２１形状
に沿った逃げ部１２３を形成するとともに、上，下壁１
２２ｂ，１２２ｃの先端部を折曲形成したフランジ１２
２ｄ，１２２ｅの中央部に、前記湾曲部１２１ａ形状に
沿った逃げ部１２３ａを形成してある。That is, the second reinforcement 122 is
The side member 101 is bent in a substantially U shape along the inner side thereof, and an escape portion 123 is formed along the curved portion 121 in the central portion of the one wall 122a thereof.
Flange 12 formed by bending the tips of 22b and 122c
An escape portion 123a is formed along the shape of the curved portion 121a at the center of 2d and 122e.
【００７５】そして、図１３に示すようにそれぞれの逃
げ部１２３，１２３ａを湾曲部１２１，１２１ａに重ね
て、第２レインフォース１２２をサイド部材１０１と閉
止部材１０２にスポット溶接して結合している。Then, as shown in FIG. 13, the relief portions 123 and 123a are overlapped with the curved portions 121 and 121a, and the second reinforcement 122 is spot-welded to the side member 101 and the closing member 102 to be joined. .
【００７６】このとき、図１０に示すように第２レイン
フォース１２２の上方のフランジ１２２ｄは、サイド部
材１０１の上方のフランジ１０１ｂと閉止部材１０２と
の間に挟んでスポット溶接されており、下方のフランジ
１２２ｅは後方傾斜部材１０３の片方の縦壁１０３ｅの
内側にスポット溶接されている。At this time, as shown in FIG. 10, the upper flange 122d of the second reinforcement 122 is spot-welded by sandwiching it between the upper flange 101b of the side member 101 and the closing member 102, and the The flange 122e is spot-welded to the inside of one vertical wall 103e of the rearward tilt member 103.
【００７７】また、前記後方傾斜部材１０３前部の両縦
壁１０３ｆ，１０３ｅには前記湾曲部１２１，１２１ａ
に沿うように湾曲部１２４，１２４ａが形成されてい
る。Further, the curved portions 121 and 121a are formed on both vertical walls 103f and 103e at the front of the rearward inclination member 103.
The curved portions 124 and 124a are formed along the line.
【００７８】前記変形抑制手段１３０は、図９，図１２
に示すように傾斜部１００Ｃの上，下壁となるダッシュ
パネル１０と後方傾斜部材１０３の下壁１０３ｄを連結
する第３補強部材としての第３レインフォース１３１を
設けて構成してある。The deformation suppressing means 130 has the structure shown in FIG. 9 and FIG.
As shown in FIG. 7, a third reinforcement 131 is provided as a third reinforcing member that connects the dash panel 10 serving as a lower wall and the lower wall 103d of the rearward tilting member 103, as a third reinforcing member.
【００７９】第３レインフォース１３１は、後方傾斜部
材１０３の傾斜部１００Ｃの全領域の内側に沿うように
断面Ｕ字状に形成され、その開放部分１３１ａの両側に
折曲形成したフランジ１３１ｂ，１３１ｃを、図１２に
示すように後方傾斜部材１０３のフランジ１０３ｂ，１
０３ｃとダッシュパネル１０との間に挟んでスポット溶
接してある。The third reinforcement 131 is formed in a U-shaped cross section along the inside of the entire region of the inclined portion 100C of the rearwardly inclined member 103, and the flanges 131b and 131c are formed on both sides of the open portion 131a. As shown in FIG. 12, the flanges 103b, 1
It is sandwiched between 03c and the dash panel 10 and spot-welded.
【００８０】また、前記第３レインフォース１３１の下
壁１３１ｄは前方（図９中手前側）に延設し、その延設
部分で前記第１レインフォース１１１を構成し、この第
１レインフォース１１１を図１１に示すように屈曲部１
００Ｂの下壁１０３ｄにスポット溶接している。The lower wall 131d of the third reinforcement 131 is extended forward (toward the front side in FIG. 9), and the extended portion constitutes the first reinforcement 111, and the first reinforcement 111 is formed. As shown in FIG.
The lower wall 103d of 00B is spot-welded.
【００８１】従って、前記屈曲部１００Ｂは第１レイン
フォース１１１によって下壁１０３ｄの強度が増大され
るため、前方からの衝突荷重Ｆに対して縦壁１０１ｄ，
１０２ａの変形が優先して変形するようになっている。Therefore, in the bent portion 100B, the strength of the lower wall 103d is increased by the first reinforcement 111, so that the vertical wall 101d, against the collision load F from the front.
The deformation of 102a is preferentially deformed.
【００８２】以上の構成により第２実施形態のフロント
サイドメンバ構造にあっては、前面衝突により前方から
衝突荷重Ｆがフロントサイドメンバ１００に入力し、閉
断面に構成したサイド部材１０１と閉止部材１０２との
前部Ｆｒの軸圧潰が略終了して後部Ｒｒへの伝達荷重Ｆ
が大きくなると、図１３に示すように第２レインフォー
ス１２２を取り付けた変形誘発手段１２０の湾曲部１２
１，１２１ａや逃げ部１２３，１２３ａに生ずる変形力
Ｆ１によって、第２レインフォース１２２の後方部分、
つまり屈曲部１００Ｂの前端部の縦壁１０１ｄ，１０２
ａを断面外方に押し開こうとするモーメントＭが発生す
る。In the front side member structure of the second embodiment having the above structure, the collision load F is input to the front side member 100 from the front due to the frontal collision, and the side member 101 and the closing member 102 having a closed cross section are formed. And the axial crushing of the front part Fr is almost completed, and the transmission load F to the rear part Rr
Becomes larger, the bending portion 12 of the deformation inducing means 120 to which the second reinforcement 122 is attached as shown in FIG.
1, 121a and the escape portions 123, 123a generate a deforming force F1 that causes the rear portion of the second reinforcement 122 to move,
That is, the vertical walls 101d, 102 at the front end of the bent portion 100B
A moment M that pushes a toward the outside of the cross section to open it is generated.
【００８３】すると、屈曲部１００Ｂは第１レインフォ
ース１１１を設けた脆弱部１１０によって、下壁１０３
ｄよりも縦壁１０１ｄ，１０２ａの強度が低下している
ため、図１１中２点鎖線に示すように、これら縦壁１０
１ｄ，１０２ａは断面外方に膨出変形して、屈曲部１０
０Ｂの屈曲方向に対する断面二次モーメントが小さくな
る。Then, the bent portion 100B is moved to the lower wall 103 by the fragile portion 110 provided with the first reinforcement 111.
Since the strength of the vertical walls 101d and 102a is lower than that of the vertical walls 101d and 102d, as shown by the chain double-dashed line in FIG.
1d and 102a are bulged and deformed to the outside of the cross section,
The second moment of area with respect to the bending direction of 0B becomes small.
【００８４】このため、屈曲部１Ｂの屈曲方向の曲げ変
形が積極的に行われ、これによってフロントサイドメン
バ１の後部に伝達される衝突エネルギーを効果的に吸収
することができるとともに、フロントサイドメンバ１０
０の傾斜部１００Ｃには第３レインフォース１３１を設
けた変形抑制手段１３０を構成してあるので、この傾斜
部１００Ｃの変形を抑制してダッシュパネル１０の車体
後方への変形を防止若しくは抑制できるため、キャビン
変形を効果的に防止することができる。Therefore, the bending deformation of the bending portion 1B in the bending direction is positively performed, whereby the collision energy transmitted to the rear portion of the front side member 1 can be effectively absorbed, and the front side member can be effectively absorbed. 10
Since the deformation suppressing means 130 provided with the third reinforcement 131 is provided in the inclined portion 100C of 0, the deformation of the inclined portion 100C can be suppressed to prevent or suppress the deformation of the dash panel 10 rearward of the vehicle body. Therefore, the deformation of the cabin can be effectively prevented.
【００８５】ところで、本発明のフロントサイドメンバ
構造は前記第１，第２実施形態に例を取って説明した
が、勿論これら実施形態に限ることなく本発明の要旨を
逸脱しない範囲内で各種実施形態を採用することができ
る。The front side member structure of the present invention has been described by taking the first and second embodiments as an example. Of course, the present invention is not limited to these embodiments and various implementations can be made without departing from the gist of the present invention. A form can be adopted.
【図１】本発明の第１実施形態におけるフロントサイド
メンバの取り付け状態を示す側面図。FIG. 1 is a side view showing a mounted state of a front side member according to a first embodiment of the present invention.
【図２】本発明の第１実施形態におけるフロントサイド
メンバの分解斜視図。FIG. 2 is an exploded perspective view of a front side member according to the first embodiment of the present invention.
【図３】図１中Ａ−Ａ線に沿った拡大断面図。FIG. 3 is an enlarged cross-sectional view taken along the line AA in FIG.
【図４】図１中Ｂ−Ｂ線に沿った拡大断面図。FIG. 4 is an enlarged cross-sectional view taken along the line BB in FIG.
【図５】図１中Ｃ−Ｃ線に沿った拡大断面図。5 is an enlarged cross-sectional view taken along the line CC in FIG.
【図６】図１中Ｄ−Ｄ線に沿った拡大断面図。FIG. 6 is an enlarged cross-sectional view taken along the line DD in FIG.
【図７】本発明の第１実施形態における屈曲部の変形状
態を示す図４に対応する拡大断面図。FIG. 7 is an enlarged cross-sectional view corresponding to FIG. 4 showing a deformed state of the bent portion in the first embodiment of the present invention.
【図８】本発明の第２実施形態におけるフロントサイド
メンバの取り付け状態を示す側面図。FIG. 8 is a side view showing a mounted state of a front side member according to the second embodiment of the present invention.
【図９】本発明の第２実施形態におけるフロントサイド
メンバの分解斜視図。FIG. 9 is an exploded perspective view of a front side member according to the second embodiment of the present invention.
【図１０】図８中Ｅ−Ｅ線に沿った拡大断面図。10 is an enlarged cross-sectional view taken along the line EE in FIG.
【図１１】図８中Ｆ−Ｆ線に沿った拡大断面図。11 is an enlarged cross-sectional view taken along the line FF in FIG.
【図１２】図８中Ｇ−Ｇ線に沿った拡大断面図。FIG. 12 is an enlarged cross-sectional view taken along the line GG in FIG.
【図１３】図８中Ｈ−Ｈ線に沿った拡大断面図。13 is an enlarged cross-sectional view taken along the line HH in FIG.
１，１００ フロントサイドメンバ １Ａ，１００Ａ メンバ本体 １Ｂ，１００Ｂ 屈曲部 １Ｃ，１００Ｃ 傾斜部 １Ｄ，１００Ｄ エクステンション部 ３ｂ，３ｃ，１０１ｄ，１０２ａ 屈曲部の縦壁 ２０，１１０ 脆弱部 ２１，２２ 薄肉稜線部 ２３ エンボス部（伸び許容部） ３０，１２０ 変形誘発手段 ３１ 横リブ ３２ 縦リブ ４０，１３０ 変形抑制手段 ４１ リブ １１１ 第１レインフォース（第１補強部材） １２１，１２１ａ 湾曲部 １２２ 第２レインフォース（第２補強部材） １３１ 第３レインフォース（第３補強部材） Ｗ 溶接 1,100 Front side member 1A, 100A member body 1B, 100B Bend 1C, 100C slope 1D, 100D extension section 3b, 3c, 101d, 102a Vertical wall of bent portion 20,110 fragile part 21,22 Thin ridge 23 Embossed part (stretchable part) 30,120 Deformation inducing means 31 horizontal ribs 32 vertical ribs 40,130 Deformation suppressing means 41 rib 111 First Reinforcement (First Reinforcement Member) 121, 121a curved part 122 Second Reinforcement (Second Reinforcement Member) 131 Third Reinforcement (Third Reinforcing Member) W welding
Claims (10)
部に車体前後方向に延在配置され、後部にダッシュパネ
ルの傾斜面に沿った傾斜部を介してフロア下面に廻り込
んだエクステンション部を形成した閉断面構造のフロン
トサイドメンバ構造において、 前記フロントサイドメンバのフロント側のメンバ本体と
傾斜部との境の屈曲部に、該屈曲部の縦壁の断面外方へ
の膨出変形を促す脆弱部を形成するとともに、 この屈曲部の前方に軸方向入力荷重に対して前記縦壁の
膨出変形を誘発する変形誘発手段を設ける一方、 前記傾斜部からエクステンション部に亘って変形抑制手
段を設けたことを特徴とするフロントサイドメンバ構
造。1. An extension part is formed on both sides of the front compartment in the vehicle width direction so as to extend in the front-rear direction of the vehicle body, and an extension part is formed in the rear part around the lower surface of the floor via an inclined part along the inclined surface of the dash panel. In a front side member structure having a closed cross-section structure, a fragile portion that promotes outward bulging deformation of a vertical wall of the bent portion at the bent portion at the boundary between the front member body and the inclined portion of the front side member. A deformation inducing means for inducing bulging deformation of the vertical wall with respect to an axial input load is provided in front of the bent portion, and a deformation suppressing means is provided from the inclined portion to the extension portion. Front side member structure characterized by
によって断面Ｕ字状に形成した下側部材と、この下側部
材の上方開放部分を覆って結合した軽合金の板材によっ
て形成した上側部材とにより閉断面に構成したことを特
徴とする請求項１に記載のフロントサイドメンバ構造。2. The front side member includes a lower member formed of a light alloy casting in a U-shaped cross-section, and an upper member formed of a light alloy plate member which is joined to cover an upper open portion of the lower member. The front side member structure according to claim 1, wherein the front side member structure has a closed cross section.
屈曲部において溶接して結合し、この溶接部分を脆弱部
の一部としたことを特徴とする請求項２に記載のフロン
トサイドメンバ構造。3. The front side member structure according to claim 2, wherein the lower member and the upper member are welded to each other at least at the bent portion and are joined to each other, and the welded portion is a part of the fragile portion. .
壁と縦壁との境の稜線部の肉厚を少なくとも前記屈曲部
において薄肉化し、この薄肉の稜線部を脆弱部としたこ
とを特徴とする請求項２，３に記載のフロントサイドメ
ンバ構造。4. A wall thickness of a ridgeline portion at a boundary between a lower wall and a vertical wall of a front side member having a closed cross section is thinned at least at the bent portion, and the thin ridgeline portion is a weak portion. The front side member structure according to claim 2 or 3.
ロントサイドメンバの閉断面を横断して一体に形成した
横リブと、この横リブの横断方向略中央部に結合して車
体前方に延び、軸方向入力荷重を該横リブに伝達する縦
リブとにより構成したことを特徴とする請求項２〜４の
いずれかに記載のフロントサイドメンバ構造。5. The deformation inducing means is integrally formed at a front portion of the bent portion across a closed cross section of the front side member, and is connected to a substantially central portion of the transverse rib in a transverse direction, and a front portion of the vehicle body. The front side member structure according to any one of claims 2 to 4, wherein the front side member structure is configured by a vertical rib that extends to a horizontal direction and that transmits an axial input load to the horizontal rib.
テンション部に亘ってそれらの対向する縦壁間を連結す
る複数のリブによって構成したことを特徴とする請求項
２〜５のいずれかに記載のフロントサイドメンバ構造。6. The deformation suppressing means is constituted by a plurality of ribs connecting between the facing vertical walls extending from the inclined portion to the extension portion, as claimed in any one of claims 2 to 5. Front side member structure.
くとも上壁の前記屈曲部に対応する位置に形成した伸び
許容部を含むことを特徴とする請求項２〜６のいずれか
に記載のフロントサイドメンバ構造。7. The front side according to claim 2, wherein the fragile portion includes an extension allowing portion formed at a position corresponding to the bent portion of at least an upper wall of the front side member. Member structure.
部を含むフロント側のメンバ本体を板材で形成し、か
つ、前記脆弱部を、前記屈曲部の下壁に縦壁よりも強度
を高くするための第１補強部材を設けて構成したことを
特徴とする請求項１に記載のフロントサイドメンバ構
造。8. A member for forming a front-side member main body including at least a bent portion of a front side member with a plate material, and for forming the fragile portion on a lower wall of the bent portion to have higher strength than a vertical wall. The front side member structure according to claim 1, wherein the front side member structure is configured by providing one reinforcing member.
縦壁に断面内方に突出する湾曲部を形成し、この湾曲部
の形成部分に沿った形状の第２補強部材を設けるととも
に、この第２補強部材を前記湾曲部を跨いでその前後に
結合することにより構成したことを特徴とする請求項８
に記載のフロントサイドメンバ構造。9. The deformation inducing means is provided with a curved portion projecting inward in cross section on opposing vertical walls in front of the bent portion, and a second reinforcing member having a shape along the portion where the curved portion is formed is provided. 9. The second reinforcing member is configured by straddling the curved portion and being connected to the front and rear of the curved portion.
Front side member structure described in.
ンション部に亘ってそれらの内周面に沿って嵌合配置し
た第３補強部材により構成したことを特徴とする請求項
８または９に記載のフロントサイドメンバ構造。10. The deformation suppressing means is constituted by a third reinforcing member that is fitted and arranged along the inner peripheral surface of the inclined portion to the extension portion along the inner peripheral surface thereof. Front side member structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002110654A JP3951780B2 (en) | 2002-04-12 | 2002-04-12 | Front side member structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002110654A JP3951780B2 (en) | 2002-04-12 | 2002-04-12 | Front side member structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003306171A true JP2003306171A (en) | 2003-10-28 |
| JP3951780B2 JP3951780B2 (en) | 2007-08-01 |
Family
ID=29393724
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002110654A Expired - Fee Related JP3951780B2 (en) | 2002-04-12 | 2002-04-12 | Front side member structure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3951780B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008123506A1 (en) | 2007-04-04 | 2008-10-16 | Sumitomo Metal Industries, Ltd. | Car-body reinforcing member, front side member, and car-body side structure |
| JP2012245963A (en) * | 2011-05-31 | 2012-12-13 | Unipres Corp | Vehicle body front frame structure |
| JP2013043562A (en) * | 2011-08-24 | 2013-03-04 | Toyota Motor Corp | Vehicle front structure |
| WO2020085385A1 (en) | 2018-10-24 | 2020-04-30 | 日本製鉄株式会社 | Automobile structural member |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101664042B1 (en) * | 2014-11-18 | 2016-10-24 | 현대자동차 주식회사 | Front side member for vehicle |
-
2002
- 2002-04-12 JP JP2002110654A patent/JP3951780B2/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008123506A1 (en) | 2007-04-04 | 2008-10-16 | Sumitomo Metal Industries, Ltd. | Car-body reinforcing member, front side member, and car-body side structure |
| US8136871B2 (en) | 2007-04-04 | 2012-03-20 | Sumitomo Metal Industries, Ltd. | Strength member for an automobile body, front side member, and side structure for an automobile body |
| EP2517950A1 (en) | 2007-04-04 | 2012-10-31 | Sumitomo Metal Industries, Ltd. | Front side member for an automobile body |
| EP2517949A1 (en) | 2007-04-04 | 2012-10-31 | Sumitomo Metal Industries Limited | Strength member for an automobile body |
| EP2522563A1 (en) | 2007-04-04 | 2012-11-14 | Sumitomo Metal Industries, Ltd. | Side structure for an automobile body |
| US8454079B2 (en) | 2007-04-04 | 2013-06-04 | Nippon Steel & Sumitomo Metal Corporation | Strength member for an automobile body, front side member, and side structure for an automobile body |
| US8899665B2 (en) | 2007-04-04 | 2014-12-02 | Nippon Steel & Sumitomo Metal Corporation | Strength member for an automobile body, front side member, and side structure for an automobile body |
| JP2012245963A (en) * | 2011-05-31 | 2012-12-13 | Unipres Corp | Vehicle body front frame structure |
| JP2013043562A (en) * | 2011-08-24 | 2013-03-04 | Toyota Motor Corp | Vehicle front structure |
| WO2020085385A1 (en) | 2018-10-24 | 2020-04-30 | 日本製鉄株式会社 | Automobile structural member |
| US11465687B2 (en) | 2018-10-24 | 2022-10-11 | Nippon Steel Corporation | Automobile structural member |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3951780B2 (en) | 2007-08-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP6156258B2 (en) | Vehicle front structure | |
| JP4407755B2 (en) | Vehicle hood structure | |
| JP4059187B2 (en) | Vehicle hood structure | |
| JP4969827B2 (en) | Body front structure | |
| US9555836B2 (en) | Vehicle side structure | |
| JP2006001500A (en) | Hood structure for vehicle | |
| JP4730043B2 (en) | Hood structure | |
| JP6600873B2 (en) | Body structure | |
| JP2008189137A (en) | Vehicle body structure | |
| JP4200907B2 (en) | Vehicle hood structure | |
| JP2010143461A (en) | Vehicle body side part structure | |
| JP2004075021A (en) | Car body skeleton structure | |
| JP3617481B2 (en) | Auto body front structure | |
| JP2010120525A (en) | Vehicle body lower structure | |
| JP2003306171A (en) | Front side member structure | |
| JP5803819B2 (en) | Vehicle front structure | |
| JP3711836B2 (en) | Body front structure | |
| JP7020351B2 (en) | Vehicle front body structure | |
| JP5056545B2 (en) | Bumper mounting structure for vehicles | |
| JP3632654B2 (en) | Body front structure | |
| JP2005297857A (en) | Bumper reinforcing structure | |
| JP2019025967A (en) | Vehicular body structure | |
| US7165805B2 (en) | Vehicle front body structure | |
| JP2008114758A (en) | Vehicular hood structure | |
| JP7213292B2 (en) | rear body structure |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20041126 |
|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20060727 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20060801 |
|
| A521 | Written amendment |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20060911 |
|
| TRDD | Decision of grant or rejection written | ||
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20070403 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20070416 |
|
| R150 | Certificate of patent (=grant) or registration of utility model |
Free format text: JAPANESE INTERMEDIATE CODE: R150 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110511 Year of fee payment: 4 |
|
| LAPS | Cancellation because of no payment of annual fees |