JPH04262975A - Automobile fore body structure - Google Patents
Automobile fore body structureInfo
- Publication number
- JPH04262975A JPH04262975A JP2437691A JP2437691A JPH04262975A JP H04262975 A JPH04262975 A JP H04262975A JP 2437691 A JP2437691 A JP 2437691A JP 2437691 A JP2437691 A JP 2437691A JP H04262975 A JPH04262975 A JP H04262975A
- Authority
- JP
- Japan
- Prior art keywords
- panel
- reinforcing member
- cowl box
- front side
- dash lower
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000000956 alloy Substances 0.000 claims abstract description 8
- 229910001234 light alloy Inorganic materials 0.000 claims abstract description 8
- 230000003014 reinforcing effect Effects 0.000 claims description 52
- 230000002787 reinforcement Effects 0.000 abstract description 6
- 239000004033 plastic Substances 0.000 abstract description 4
- 239000011162 core material Substances 0.000 description 10
- 239000000463 material Substances 0.000 description 7
- 229910052782 aluminium Inorganic materials 0.000 description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000004619 high density foam Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Landscapes
- Body Structure For Vehicles (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は自動車の車体前部構造に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the front structure of an automobile body.
【０００２】0002
【従来の技術】近年、燃費低減や車両の性能向上のため
車体の軽量化が要求されており、この要求に応えるべく
車体の構造部材に軽合金材料を通用する研究が進められ
、既に市販されている車両もある。[Prior Art] In recent years, there has been a demand for lighter vehicle bodies in order to reduce fuel consumption and improve vehicle performance.In order to meet this demand, research has been progressing on the use of light alloy materials for structural members of vehicle bodies, and some have already been commercially available. There are some vehicles.
【０００３】このような軽合金材料を用いた場合であっ
ても、通常のスチールパネルを組合わせたモノコック構
造と同様の車体、即ち、図１３に示すようにパネル材で
閉断面に形成したメンバを骨格として、これら骨格メン
バにパネルを接合してモノコック構造の車体１を構成し
ている。Even when such a light alloy material is used, the vehicle body has the same monocoque structure as a combination of ordinary steel panels, that is, a member formed with a closed cross section of panel material as shown in FIG. A vehicle body 1 having a monocoque structure is constructed by joining panels to these frame members.
【０００４】図１４は図１３に示した車体１の前部構造
を示すもので、２はエンジンルーム前端のラジエータコ
アサポート、３はエンジンルームの側壁を形成するフー
ドレッジパネルで、その上縁部にはフードレッジレイン
フォース３ａを接合して形成した閉断面の補強部４が前
後方向に延在している。５はフードレッジパネル３の下
縁に接合されて前後方向に延在する車体前部骨格メンバ
であるフロントサイドメンバを示し、パネル材をもって
閉断面に形成されていて前端部をラジエータコアサポー
ト２に、および後端部をダッシュロアパネル６に接合し
てある。ダッシュロアパネル６はエンジンルームと客室
とを隔成し、その上部に車幅方向骨格メンバであるカウ
ルボックス７を接合してあると共に、下部にダッシュク
ロスメンバ８を接合して車幅方向の閉断面部を形成して
剛性を確保している。カウルボックス７はその側端部を
前記フードレッジパネル３の補強部４に接合して、上下
方向骨格部材であるフロントピラー９に接続してある。
また、フロントピラー９の下端にはフロアサイドの前後
方向骨格メンバであるサイドシル１０を結合してある。
また、前記フロントサイドメンバ５の前端には、ステイ
１１ａを介してフロントバンパ１１が装着されている。
図１３中１２はセンターピラー、１３はリヤピラー、１
４はフロアパネル、１５はルーフパネル、１６はフロン
トフェンダ、１７はリヤフェンダ、１８はリヤエンドパ
ネルを示す。（この類似構造は、例えば自動車工学全書
自動車の車体；（株）山海堂発行に示されている。）FIG. 14 shows the front structure of the vehicle body 1 shown in FIG. 13, where 2 is a radiator core support at the front end of the engine room, 3 is a hood ledge panel forming the side wall of the engine room, and its upper edge A reinforced portion 4 with a closed cross section formed by joining a hood ledge reinforcement 3a extends in the front-rear direction. Reference numeral 5 designates a front side member which is a front frame member of the vehicle body that is joined to the lower edge of the hood ledge panel 3 and extends in the longitudinal direction.The front side member is formed into a closed section with the panel material, and its front end is attached to the radiator core support 2. , and the rear end thereof are joined to the dash lower panel 6. The dash lower panel 6 separates the engine room from the passenger compartment, and has a cowl box 7, which is a frame member in the vehicle width direction, joined to its upper part, and a dash cross member 8 joined to its lower part to form a closed section in the vehicle width direction. The rigidity is ensured by forming a section. The cowl box 7 has its side ends joined to the reinforcing part 4 of the hood ledge panel 3, and is connected to the front pillar 9, which is a vertical frame member. Further, a side sill 10, which is a frame member in the longitudinal direction of the floor side, is coupled to the lower end of the front pillar 9. Further, a front bumper 11 is attached to the front end of the front side member 5 via a stay 11a. In Figure 13, 12 is the center pillar, 13 is the rear pillar, 1
4 is a floor panel, 15 is a roof panel, 16 is a front fender, 17 is a rear fender, and 18 is a rear end panel. (This similar structure is shown, for example, in Automotive Engineering Zensho Automobile Body; Published by Sankaido Co., Ltd.)
【
０００５】[
0005
【発明が解決しようとする課題】一般に軽合金材料例え
ばアルミニウムは、スチールに対して比重が約１／３で
あるが、ヤング率が１／３，引張り強度が２／３から同
等である（スチールはＳＰＣＣ、アルミニウムは５００
０系で比較したもので、社団法人自動車技術会発行自動
車工学便覧１２編第１章材料Ｐ１−５、及び社団法人軽
金属協会発行アルミニウムハンドブックＰ３３参照）。
このことからも、アルミニウムはスチールに対して、剛
性低下よりも強度低下代の方が小さいことが判る。[Problems to be Solved by the Invention] In general, light alloy materials such as aluminum have a specific gravity that is approximately 1/3 that of steel, but have a Young's modulus of 1/3 and a tensile strength of 2/3, which is equivalent to that of steel. is SPCC, aluminum is 500
0 series, see Automotive Engineering Handbook, Volume 12, Chapter 1, Materials P1-5 published by the Society of Automotive Engineers of Japan, and Aluminum Handbook P33 published by the Light Metals Association). This also shows that the decrease in strength of aluminum is smaller than the decrease in rigidity compared to steel.
【０００６】ところで、車体を設計する場合、先づ剛性
設計を行うのが一般的であり、材料としてアルミニウム
を使用する場合にあっては、車体１を前述のようにスチ
ールパネル組合わせのモノコック車体と同様に全体をパ
ネル材のスポット溶接により形成するように設計した場
合、剛性設計のフロントサイドメンバ５は他の骨格メン
バと同様にその板厚を厚くする必要があり、全体的に破
壊荷重が大きくなり、衝突時に塑性変形しにくくなる。By the way, when designing a car body, it is common to design the rigidity first, and when aluminum is used as the material, the car body 1 is a monocoque car body made of a combination of steel panels as described above. Similarly, if the whole is designed to be formed by spot welding panel materials, the front side member 5, which has a rigid design, needs to be thickened like other frame members, and the overall failure load will be reduced. This makes it difficult for plastic deformation to occur during a collision.
【０００７】従って、車両が前面衝突すると図１５に示
すように、ダッシュロアパネル６の剛性強度に比べてフ
ロントサイドメンバ５の衝突時反力が大きいため、該フ
ロントサイドメンバ５の塑性変形によるエネルギ吸収が
少なく、フロントサイドメンバ５後端部のダッシュロア
パネル６およびその後方で多くのエネルギを吸収するよ
うになって車室内変形が大きくなる可能性があり、この
ため、より安全性を高めるためにはダッシュロアパネル
６を大規模に補強する必要がある。Therefore, when a vehicle has a frontal collision, as shown in FIG. 15, the reaction force of the front side member 5 at the time of the collision is larger than the rigidity of the dash lower panel 6, so that energy is absorbed by plastic deformation of the front side member 5. If the energy is small, the dash lower panel 6 at the rear end of the front side member 5 and behind it will absorb a lot of energy, which may increase the deformation of the vehicle interior. Therefore, in order to further improve safety, It is necessary to reinforce the dash lower panel 6 on a large scale.
【０００８】そこで、本発明は車両衝突時に、フロント
サイドメンバに作用する衝突荷重を該フロントサイドメ
ンバ後端のダッシュロアパネル結合部分で支持できて、
該フロントサイドメンバを効率よく塑性変形させること
ができ、客室の変形を最小限に抑えることができる自動
車の車体前部構造を提供するものである。Accordingly, the present invention is capable of supporting the collision load acting on the front side member at the time of a vehicle collision at the dash lower panel connecting portion at the rear end of the front side member.
An object of the present invention is to provide a front body structure for an automobile that can efficiently plastically deform the front side member and minimize deformation of a passenger compartment.
【０００９】[0009]
【課題を解決するための手段】車体を軽合金材料で形成
した車体において、ラジエータコアサポートにフロント
バンパーからの衝突入力を、フードレッジパネルの上縁
部から該フードレッジパネル上縁部に結合したカウルボ
ックスに伝達する第１の補強部材を設ける一方、これら
フードレッジパネル，カウルボックスを接合したダッシ
ュロアパネルに、カウルボックスとダッシュロアクロス
メンバとに亘り、かつ、フードレッジパネル上縁部とカ
ウルボックスとの接続部、およびダッシュロアパネルと
フロントサイドメンバとの接続部を通る第２の補強部材
を上下方向に設け、更に、第２の補強部材の前記両接続
部間で、該第２の補強部材を後側から支持する支持部を
設けてある。[Means for Solving the Problem] In a vehicle body made of a light alloy material, a cowl connects the collision input from the front bumper to the radiator core support from the upper edge of the hood ledge panel to the upper edge of the hood ledge panel. While providing a first reinforcing member that transmits power to the box, the dash lower panel to which the hood ledge panel and cowl box are joined is provided with a reinforcing member that extends between the cowl box and the dash lower cross member, and also between the upper edge of the hood ledge panel and the cowl box. A second reinforcing member is provided in the vertical direction passing through the connecting portion of the dash lower panel and the front side member, and further, the second reinforcing member is provided between the connecting portions of the second reinforcing member. A support part is provided to support it from the rear side.
【００１０】0010
【作用】車両の前面衝突時にフロントバンパーに衝突入
力が作用すると、この衝突入力は第１の補強部材により
フードレッジパネル上縁部に後方荷重として入ってカウ
ルボックスに伝えられる。[Operation] When a collision input is applied to the front bumper during a frontal collision of the vehicle, this collision input is applied as a rear load to the upper edge of the hood ledge panel by the first reinforcing member and is transmitted to the cowl box.
【００１１】カウルボックスに作用した衝突入力は第２
の補強部材の上端部に伝達され、該第２の補強部材に支
持部材を支点とするモーメントを発生させ、この第２の
補強部材の回転モーメントは、フンロトサイドメンバ後
端の接続部で該フンロトサイドメンバに前方へ向く反発
力として働く。この結果、フンロトサイドメンバに前方
より作用する衝突荷重を、ダッシュロアパネル側で支持
でき、該フンロトサイドメンバを効率よく塑性変形させ
ることができる。The collision input acting on the cowl box is the second
is transmitted to the upper end of the reinforcing member, generating a moment in the second reinforcing member with the supporting member as a fulcrum, and the rotational moment of the second reinforcing member is transmitted to the upper end of the rear end of the rotary side member. It acts as a repulsive force that directs the Funroto side member forward. As a result, the collision load acting on the front rotor side member from the front can be supported by the dash lower panel side, and the rear rotor side member can be efficiently plastically deformed.
【００１２】0012
【実施例】以下、本発明の実施例を図面と共に詳述する
。Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
【００１３】図１〜５はアルミニウム等の軽合金材料か
らなるパネル材を組合わせてモノコック構造とした車体
１の前部構造を示すもので、フードレッジパネル３の上
側縁にはフードレッジレインフオース３ａを接合して閉
断面に形成した補強部４を前後方向に形成してあると共
に、下側縁にはパネル材をもって閉断面に形成したフロ
ントサイドメンバ５を前後方向に接合してある点、該フ
ロントサイドメンバ５はその前端をラジエータコアサポ
ート２に接合すると共に後端をダッシュロアパネル６に
接合してある点、ダッシュロアパネル６の上部に接合し
たカウルボックス７の側端部を、フードレッジパネル３
の補強部４の後端部側面に接合してフロントピラー９に
接続してある点、等の基本的構造は前記従来と同様であ
る。1 to 5 show the front structure of a vehicle body 1 which has a monocoque structure by combining panel materials made of light alloy materials such as aluminum. A reinforcing part 4 formed in a closed cross section by joining the aus 3a is formed in the front-rear direction, and a front side member 5 formed in a closed cross-section with a panel material is joined in the front-rear direction on the lower edge. , the front side member 5 has its front end joined to the radiator core support 2 and its rear end joined to the dash lower panel 6, and the side end of the cowl box 7 joined to the upper part of the dash lower panel 6 is connected to the hood ledge. Panel 3
The basic structure is the same as that of the prior art, such as the fact that it is joined to the side surface of the rear end of the reinforcing part 4 and connected to the front pillar 9.
【００１４】ここで、前記ラジエータコアサポート２に
は、フロントサイドメンバ５前端に装着したフロントバ
ンパー１１に作用する衝突入力を、フードレッジパネル
３上縁部の補強部４から該補強部４に結合したカウルボ
ックス７に伝達する第１の補強部材２０を設けてある。
第１の補強部材２０はラジエータコアサポート２の上縁
および左右側縁に亘って接合してあって、下端部をボル
ト２２によりフロントサイドメンバ５にフロントバンパ
ー１１のステイ１１ａと共締め固定してあると共に、下
端末部をボルト２１によってフロントサイドメンバ５に
固定してある。Here, in the radiator core support 2, a collision input acting on the front bumper 11 attached to the front end of the front side member 5 is connected to the reinforcing part 4 from the reinforcing part 4 at the upper edge of the hood ledge panel 3. A first reinforcing member 20 is provided that communicates with the cowl box 7. The first reinforcing member 20 is joined across the upper edge and left and right side edges of the radiator core support 2, and its lower end is fixed to the front side member 5 by bolts 22 together with the stay 11a of the front bumper 11. At the same time, the lower end portion is fixed to the front side member 5 with bolts 21.
【００１５】本実施例にあっては第１の補強部材２０か
らカウルボックス７への衝突入力伝達をより確実に行わ
せるため、カウルボックス７のフードレッジパネル３と
の接続部に、前壁をカウルボックス７の前壁裏面に接合
し、かつ、側壁がフードレッジパネル３面に沿う平面Ｌ
字状のブレース２３を配設してあると共に、フードレッ
ジパネル３の補強部４内に閉断面構造のビーム２４を挿
入配置してあって、このビーム２４の前端を第１の補強
部材２０に接合すると共に、ビーム２４の後端を前記ブ
レース２３に接合してある。In this embodiment, in order to more reliably transmit the collision input from the first reinforcing member 20 to the cowl box 7, a front wall is provided at the connection part of the cowl box 7 with the hood ledge panel 3. A plane L that is joined to the back surface of the front wall of the cowl box 7 and whose side wall is along the 3 sides of the hood ledge panel.
A brace 23 in the shape of a letter is provided, and a beam 24 having a closed section structure is inserted into the reinforcing portion 4 of the hood ledge panel 3, and the front end of this beam 24 is connected to the first reinforcing member 20. At the same time, the rear end of the beam 24 is joined to the brace 23.
【００１６】また、前記ダッシュロアパネル６の客室側
の側面には、カウルボックス２３からダッシュロアクロ
スメンバ８に亘って上下方向に第２の補強部材２５を接
合配置してある。具体的には、この第２の補強部材２５
はその上端部をカウルボックス７の底壁を貫通してブレ
ース２３の背面に接合して、カウルボックス７をフード
レッジパネル３の補強部４との接続部に配置してあると
共に、該第２の補強部材２５の下側中間部はダッシュロ
アパネル６のフロントサイドメンバ５との接続部を通っ
てダッシュロアクロスメンバ８形成部分に亘って接合し
てある。第２の補強部材２５は断面略ハット形に形成し
て、ダッシュロアパネル６面に接合して閉断面の剛性構
造となっており、カウルボックス７に伝達される衝突入
力を、該第２の補強部材２５で支持，負担できるように
してある。Further, a second reinforcing member 25 is vertically connected to the side surface of the dash lower panel 6 on the passenger side, extending from the cowl box 23 to the dash lower cross member 8. Specifically, this second reinforcing member 25
has its upper end penetrated through the bottom wall of the cowl box 7 and joined to the back side of the brace 23, so that the cowl box 7 is arranged at the connection part with the reinforcing part 4 of the hood ledge panel 3, and the second The lower middle portion of the reinforcing member 25 is joined to the dash lower cross member 8 forming portion through the connection portion with the front side member 5 of the dash lower panel 6. The second reinforcing member 25 has a substantially hat-shaped cross section and is joined to the dash lower panel 6 to form a rigid structure with a closed cross section. It is designed so that it can be supported and borne by a member 25.
【００１７】そして、前記第２の補強部材２５を、カウ
ルボックス７と補強部４との接続部と、ダッシュロアパ
ネル６とフロントサイドメンバ５の接続部との間で、後
側より支持する支持部２６を設けてある。この実施例に
あってはフロントピラー９に配設したドアヒンジブレー
ス２７，２７のうち、上側のドアヒンジブレース２７の
前縁に支持部２６を延設し、この支持部２６をブレース
２３の側壁後縁の下端に当接配置してある。A support section supports the second reinforcing member 25 from the rear side between the connecting section between the cowl box 7 and the reinforcing section 4 and the connecting section between the dash lower panel 6 and the front side member 5. 26 are provided. In this embodiment, of the door hinge braces 27, 27 disposed on the front pillar 9, a support portion 26 is extended to the front edge of the upper door hinge brace 27, and this support portion 26 is connected to the rear edge of the side wall of the brace 23. It is placed in contact with the lower end of.
【００１８】以上の実施例構造によれば、車両の前面衝
突時にフロントバンパー１１に衝突入力Ｆが作用すると
、フロントサイドメンバ５に大入力として作用する前に
フロントバンパー１１のステイ１１ａの固定用のボルト
２２により第１の補強部材２０に後方荷重として作用す
る。この後方荷重により第１の補強部材２０には図６に
示すように、その下端の固定用のボルト２１を支点とし
てモーメントＭ１が発生し、フードレッジパネル３の補
強部４に後方荷重ｆ１を発生させる。According to the structure of the above embodiment, when a collision input F acts on the front bumper 11 during a frontal collision of the vehicle, the bolt 22 for fixing the stay 11a of the front bumper 11 is closed before a large input acts on the front side member 5. This acts as a rear load on the first reinforcing member 20. Due to this rear load, a moment M1 is generated in the first reinforcing member 20 with the fixing bolt 21 at its lower end as a fulcrum, as shown in FIG. 6, and a rear load f1 is generated in the reinforcement part 4 of the hood ledge panel 3 let
【００１９】この後方荷重ｆ１はカウルボックス７のブ
レース２３に、および該ブレース２３に接合した第２の
補強部材２５に伝達されるが、ブレース２３の後縁下端
が支持部２６により支持されているため、該第２の補強
部材２５に支持部２６を支点としてモーメントＭ２が発
生し、この回転モーメントＭ２によりダッシュロアパネ
ル６のフロントサイドメンバ５接続部分で、該フロント
サイドメンバ５に前方へ押し出す方向の力即ち、反発力
ｆ２を生じさせる。この一連の作用はフロントバンパー
１１に入力した衝突荷重Ｆによりフロントサイドメンバ
５後端でダッシュロアパネル６の客室側に変形させよう
とするのと同時、あるいはそれ以前に行われる。This rear load f1 is transmitted to the brace 23 of the cowl box 7 and to the second reinforcing member 25 joined to the brace 23, but the lower end of the rear edge of the brace 23 is supported by the support portion 26. Therefore, a moment M2 is generated in the second reinforcing member 25 with the support portion 26 as a fulcrum, and this rotational moment M2 causes the front side member 5 to be pushed forward at the connecting portion of the front side member 5 of the dash lower panel 6. That is, a repulsive force f2 is generated. This series of actions is performed at the same time as or before the dash lower panel 6 is deformed toward the passenger compartment at the rear end of the front side member 5 due to the collision load F input to the front bumper 11.
【００２０】この結果、ダッシュロアパネル６の反発力
ｆ２により、フロントサイドメンバ５に前方より入力す
る衝突荷重を支持し、フロントサイドメンバ５を効率よ
く塑性変形させてエネルギ吸収を行わせ、ダッシュロア
パネル６の客室側への変形を最小限に抑えることができ
る。As a result, the repulsive force f2 of the dash lower panel 6 supports the collision load input from the front to the front side member 5, efficiently deforms the front side member 5 plastically and absorbs energy, and the dash lower panel 6 deformation to the passenger compartment side can be minimized.
【００２１】前記実施例にあっては、荷重伝達を確実に
行わせるために、フードレッジパネル３の補強部４内に
ビーム２４を配置すると共に、カウルボックス７の補強
部４接続部分にブレース２３を配設してあるが、補強部
４，カウルボックス７が高剛性の場合には、特にこれら
の部材２４，２３を用いなくてもよい。In the above embodiment, in order to ensure load transmission, a beam 24 is disposed within the reinforcing portion 4 of the hood ledge panel 3, and a brace 23 is provided at the connecting portion of the reinforcing portion 4 of the cowl box 7. However, if the reinforcing portion 4 and cowl box 7 have high rigidity, these members 24 and 23 may not be used.
【００２２】また、第１の補強部材２０は、その下端の
ボルト２１固定部の上側でボルト２２によりフロントバ
ンパー１１のステイ１１ａと共締め固定して、ボルト２
１固定部の上側に衝突荷重Ｆが入力するようにしてある
が、図７に示すようにフロントバンパー１１の後退時に
これを受ける突起２０ａを設けて入力部を構成すれば、
ステイ１１ａと共締め固定する必要はない。The first reinforcing member 20 is fixed together with the stay 11a of the front bumper 11 by means of a bolt 22 above the bolt 21 fixing portion at the lower end thereof.
1, the collision load F is input to the upper side of the fixed part, but if the input part is configured by providing a protrusion 20a that receives this when the front bumper 11 retreats, as shown in FIG.
There is no need to tighten and fix it together with the stay 11a.
【００２３】更に、第２の補強部材２５は断面略ハット
形のビーム材として構成しているが、これは、図８に示
すようにダッシュロアパネル６を、２枚のパネル６ａ，
６ｂ間に高密度発泡体やハニカム構造のコア６ｃを芯材
としたサンドイッチ構造として、ダッシュロアパネル６
自体で第２の補強部材を構成することもできる。Furthermore, the second reinforcing member 25 is constructed as a beam member having a substantially hat-shaped cross section, which is used to connect the dash lower panel 6 to two panels 6a, 6a,
The dash lower panel 6 is constructed as a sandwich structure with a core 6c of high-density foam or honeycomb structure as a core material between 6b.
It is also possible to constitute the second reinforcing member by itself.
【００２４】また、支持部２６はフロントピラー９に配
設した上側のドアヒンジブレース２７を有効利用して、
該ドアヒンジブレース２７に一体に延設してあるが、ド
アヒンジブレース２７とは別にブレース２３の下方で第
２の補強部材２５の背面を支持部２６により支持させる
ようにしてもよく、この場合、図９に示すように、支持
部２６による支点と、カウルボックス７への入力作用点
との間の距離が長くなるため、入力ｆ１に対して発生す
るモーメントＭ２が大きく、従って、反発力ｆ２も大き
くなるためより効率よくフロントサイドメンバ５を塑性
変形できてエネルギ吸収量を拡大することができる。Furthermore, the support section 26 effectively utilizes the upper door hinge brace 27 disposed on the front pillar 9.
Although it extends integrally with the door hinge brace 27, the back surface of the second reinforcing member 25 may be supported by a supporting portion 26 below the brace 23 separately from the door hinge brace 27. As shown in 9, since the distance between the fulcrum of the support part 26 and the point of input application to the cowl box 7 becomes longer, the moment M2 generated in response to the input f1 is large, and therefore the repulsive force f2 is also large. Therefore, the front side member 5 can be plastically deformed more efficiently, and the amount of energy absorbed can be increased.
【００２５】図１０，１１は支持部２６の異なる例を示
すもので、フードレッジパネル３の補強部４とカウルボ
ックス７および第２の補強部材２５との結合部、例えば
図３〜５に示したブレース２３の後側に側面半円形の凸
部２６ａを形成する一方、フロントピラー９の前記凸部
２６ａに対応する部位に、該凸部２６ａを受容する側面
半円状の凹部２６ｂを形成し、凸部２６ａの上縁を凹部
２６ｂに内接させて、これら凸部２６ａと凹部２６ｂと
を若干離間配置してある。また、前記凸部２６ａ上縁と
凹部２６ｂとの内接部分は、その接線と後方荷重入力線
とのなす角度θを４５度以下としてある。FIGS. 10 and 11 show different examples of the support portion 26, and the connection portion between the reinforcing portion 4 of the hood ledge panel 3 and the cowl box 7 and the second reinforcing member 25, for example, as shown in FIGS. A side semicircular convex portion 26a is formed on the rear side of the brace 23, and a side semicircular concave portion 26b is formed at a portion of the front pillar 9 corresponding to the convex portion 26a to receive the convex portion 26a. The upper edge of the convex portion 26a is inscribed in the concave portion 26b, and the convex portion 26a and the concave portion 26b are arranged with a slight distance from each other. Furthermore, the angle θ between the tangent of the inscribed portion between the upper edge of the convex portion 26a and the concave portion 26b and the rear load input line is 45 degrees or less.
【００２６】この実施例構造によれば、補強部４に作用
する後方荷重ｆ１は、凸部２６ａと凹部２６ｂとの当接
部でｆ１ａ，ｆ１ｂに分散されるが、ｆ１ａ＜ｆ１ｂの
関係となるため、凸部２６ａが凹部２６ｂ面を図１１の
鎖線で示すように回転しながら摺動するようになる。こ
の結果、第２の補強部材２５にモーメントＭ２が発生し
、前記実施例の場合と同様にフロントサイドメンバ結合
部分に反発力を生じさせる。According to the structure of this embodiment, the rearward load f1 acting on the reinforcing portion 4 is dispersed into f1a and f1b at the contact portion between the convex portion 26a and the concave portion 26b, and the relationship f1a<f1b holds. Therefore, the convex portion 26a rotates and slides on the surface of the concave portion 26b as shown by the chain line in FIG. As a result, a moment M2 is generated in the second reinforcing member 25, causing a repulsive force to be generated at the front side member connecting portion as in the previous embodiment.
【００２７】図１２は前記図１０，１１に示した実施例
の変形例を示し、凸部２６ａは側面方形状に、また、凹
部２６ｂは側面略台形状に形成し、凸部２６ａの上縁に
Ｒ部２６ｃを形成して、該Ｒ部２６ｃを凹部２６ｂの上
側のテーパ面に当接させたもので、この場合にあっても
該当接部の接線と後方荷重入力線とのなす角度θを４５
度以下として、前記図１１０，１１に示した実施例と同
様の効果を得られるようにしてある。FIG. 12 shows a modification of the embodiment shown in FIGS. 10 and 11, in which the convex portion 26a has a rectangular side surface, the concave portion 26b has a substantially trapezoidal side surface, and the upper edge of the convex portion 26a has a substantially trapezoidal shape. An R portion 26c is formed in the groove, and the R portion 26c is brought into contact with the upper tapered surface of the recess 26b. Even in this case, the angle θ between the tangent of the contact portion and the rear load input line is 45
It is possible to obtain the same effects as the embodiments shown in FIGS. 110 and 11 above.
【００２８】[0028]
【発明の効果】以上のように本発明によれば、フロント
バンパーに作用する衝突入力を第１の補強部材からフー
ドレッジパネル上縁からカウルボックスに伝達させ、更
に、第２の補強部材に入力させることができると共に、
支持部によってこの第２の補強部材にフロントサイドメ
ンバ後端から前方へ押し出し方向への反発力を得るモー
メントを発生させることができるため、フロントサイド
メンバ前端より入力する衝突荷重を支持して、該フロン
トサイドメンバを効率よく塑性変形させることができ、
従って、軽合金材料でフロントサイドメンバを剛性構造
としてあっても、ダッシュロアパネルの客室側への変形
量を小さく抑えて衝突エネルギ吸収効果を挙げることが
できる。As described above, according to the present invention, the collision input acting on the front bumper is transmitted from the first reinforcing member to the upper edge of the hood ledge panel to the cowl box, and is further input to the second reinforcing member. In addition to being able to
The support portion can generate a moment that generates a repulsive force in the direction of pushing forward from the rear end of the front side member in this second reinforcing member, so it supports the collision load input from the front end of the front side member and The front side member can be plastically deformed efficiently,
Therefore, even if the front side members are made of light alloy material and have a rigid structure, the amount of deformation of the dash lower panel toward the passenger compartment can be suppressed to a small extent, and the impact energy absorption effect can be achieved.
【図１】本発明の一実施例を示す略示的側面図。FIG. 1 is a schematic side view showing one embodiment of the present invention.
【図２】同実施例のラジエータコアサポート周りの斜視
図。FIG. 2 is a perspective view of the radiator core support and its surroundings in the same embodiment.
【図３】同実施例のカウルボックス周りをエンジンルー
ム側から見た斜視図。FIG. 3 is a perspective view of the cowl box and its surroundings of the same embodiment as seen from the engine room side.
【図４】図３のＡ−Ａ線に沿う断面図。FIG. 4 is a sectional view taken along line A-A in FIG. 3;
【図５】同実施例の支持部配設状態を示す斜視図。FIG. 5 is a perspective view showing the arrangement of the support portion of the same embodiment.
【図６】同実施例の力学モデル図。FIG. 6 is a dynamic model diagram of the same example.
【図７】第１の補強部材の異なる例を示す略示的側面図
。FIG. 7 is a schematic side view showing a different example of the first reinforcing member.
【図８】第２の補強部材の異なる例を示す図３のＢ−Ｂ
線に沿う断面図。FIG. 8: B-B in FIG. 3 showing different examples of the second reinforcing member;
A cross-sectional view along the line.
【図９】支持部材の配設位置を下側に変更した場合の力
学モデル図。FIG. 9 is a diagram of a dynamic model when the arrangement position of the support member is changed to the lower side.
【図１０】支持部の異なる例を示す略示的側面図。FIG. 10 is a schematic side view showing different examples of the support part.
【図１１】同実施例の要部の拡大説明図。FIG. 11 is an enlarged explanatory diagram of main parts of the same embodiment.
【図１２】支持部の更に異なる例を示す拡大説明図。FIG. 12 is an enlarged explanatory diagram showing still another example of the support part.
【図１３】本発明の対象とする車体の斜視図。FIG. 13 is a perspective view of a vehicle body to which the present invention is applied.
【図１４】従来の構造を示す側面図。FIG. 14 is a side view showing a conventional structure.
【図１５】同構造の塑性変形時の側面図。FIG. 15 is a side view of the same structure during plastic deformation.
１…車体、２…ラジエータコアサポート、３…フードレ
ッジパネル、４…フードレッジパネルの上縁部、５…フ
ロントサイドメンバ、６…ダッシュロアパネル、７…カ
ウルボックス、８…ダッシュロアクロスメンバ、１１…
フロントバンパー、２０…第１の補強部材、２５…第２
の補強部材、２６…支持部。DESCRIPTION OF SYMBOLS 1... Vehicle body, 2... Radiator core support, 3... Hood ledge panel, 4... Upper edge of hood ledge panel, 5... Front side member, 6... Dash lower panel, 7... Cowl box, 8... Dash lower cross member, 11 …
Front bumper, 20...first reinforcing member, 25...second
reinforcing member, 26...support part.
Claims (1)
いて、ラジエータコアサポートにフロントバンパーから
の衝突入力を、フードレッジパネルの上縁部から該フー
ドレッジパネル上縁部に結合したカウルボックスに伝達
する第１の補強部材を設ける一方、これらフードレッジ
パネル，カウルボックスを接合したダッシュロアパネル
に、カウルボックスとダッシュロアクロスメンバとに亘
り、かつ、フードレッジパネル上縁部とカウルボックス
との接続部、およびダッシュロアパネルとフロントサイ
ドメンバとの接続部を通る第２の補強部材を上下方向に
設け、更に、第２の補強部材の前記両接続部間で、該第
２の補強部材を後側から支持する支持部を設けたことを
特徴とする自動車の車体前部構造。Claim 1: In a vehicle body made of a light alloy material, a collision input from a front bumper is transmitted to a radiator core support from an upper edge of a hood ledge panel to a cowl box connected to the upper edge of the hood ledge panel. A first reinforcing member is provided on the dash lower panel to which the hood ledge panel and cowl box are joined, spanning the cowl box and the dash lower cross member, and at the connection portion between the upper edge of the hood ledge panel and the cowl box; and a second reinforcing member passing through the connecting portion between the dash lower panel and the front side member in the vertical direction, further supporting the second reinforcing member from the rear side between both the connecting portions of the second reinforcing member. A vehicle front structure for an automobile, characterized in that a support section is provided for supporting the vehicle body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2437691A JPH04262975A (en) | 1991-02-19 | 1991-02-19 | Automobile fore body structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2437691A JPH04262975A (en) | 1991-02-19 | 1991-02-19 | Automobile fore body structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04262975A true JPH04262975A (en) | 1992-09-18 |
Family
ID=12136475
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2437691A Pending JPH04262975A (en) | 1991-02-19 | 1991-02-19 | Automobile fore body structure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04262975A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6874843B2 (en) | 2002-08-13 | 2005-04-05 | Mitsubishi Jidosha Kogyo Kabushiki Kaisha | Vehicle front-end body structure |
| JP2006193023A (en) * | 2005-01-12 | 2006-07-27 | Toyota Motor Corp | Front structure of car body |
-
1991
- 1991-02-19 JP JP2437691A patent/JPH04262975A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6874843B2 (en) | 2002-08-13 | 2005-04-05 | Mitsubishi Jidosha Kogyo Kabushiki Kaisha | Vehicle front-end body structure |
| JP2006193023A (en) * | 2005-01-12 | 2006-07-27 | Toyota Motor Corp | Front structure of car body |
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