JP2005119566A - Front body structure for cab-over type vehicle - Google Patents

Front body structure for cab-over type vehicle Download PDF

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JP2005119566A
JP2005119566A JP2003358655A JP2003358655A JP2005119566A JP 2005119566 A JP2005119566 A JP 2005119566A JP 2003358655 A JP2003358655 A JP 2003358655A JP 2003358655 A JP2003358655 A JP 2003358655A JP 2005119566 A JP2005119566 A JP 2005119566A
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shock absorbing
vehicle
cab
absorbing portion
inclined portion
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JP3960293B2 (en
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Takuo Ishikawa
拓生 石川
Makoto Kuriki
誠 栗木
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Toyota Auto Body Co Ltd
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Toyota Auto Body Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To increase shock absorbing ability in the front part of a vehicle at the time of vehicle collision. <P>SOLUTION: This front body structure for a cab-over type vehicle comprises an upper member 2 made of a tilted part 2a rising from the upper surface of the middle part to the front and upward direction with a slight tilting attitude and an upper member 2, and a shock absorbing part 2b provided in the front end, extending approximately to the front end position of a front side member 1 in parallel with the front side member 1, and absorbing shock by compressive deformation at the time of vehicle collision respectively to the right and left front side members 1 of the cab-over type vehicle. The rear end of the shock absorbing part 2b of the upper member 2 and the front end of the inclination part 2a are connected in the forward descending inclined direction, and even when a collision load F1 is applied to the shock absorbing part 2b in the obliquely downward direction at the time of vehicle collision, the collision absorbing ability is exhibited by axially compressively deforming the shock absorbing part 2b. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明はキャブオーバー型車の車体前部構造に関する。   The present invention relates to a vehicle body front structure of a cab over type vehicle.

キャブオーバー型車の車体前部構造において、下記特許文献１に開示されているように、車両前後方向に延びる左右のフロントサイドメンバに、その長手方向に沿って軸線からはずれた位置に、車両衝突時に圧縮変形して衝撃を吸収する衝撃吸収部を設けることが提案されている。   In the front body structure of a cab-over type vehicle, as disclosed in Patent Document 1 below, a vehicle collision occurs at left and right front side members extending in the longitudinal direction of the vehicle at a position off the axis along the longitudinal direction. It has been proposed to provide an impact absorbing portion that sometimes compresses and absorbs an impact.

図７は上記衝撃吸収部を備えた従来の代表的な車体前部構造を示し、フロントサイドメンバ１には、後端がフロントサイドメンバ１の中間部上面に結合されて前方かつ上方へ向けて緩やかな傾斜姿勢で立ち上がる傾斜部２ａと、その前端に連結されてフロントサイドメンバ１と平行に前方へ延びる衝撃吸収部２ｂとからなるアッパメンバ２Ａが設けられている。アッパメンバ２Ａの傾斜部２ａは車室フロア３前端のトーボード部３０およびその前縁から起立するダッシュパネル４を下方より支持している。傾斜部２ａの前端上部には、ダッシュパネル４の前面下縁に沿って車幅方向に延びるダッシュリィンフォースメント４０が設けられ、傾斜部２ａの前端縁はダッシュリィンフォースメント４０の前面と垂直方向に合致している。   FIG. 7 shows a conventional typical vehicle body front structure provided with the above-described shock absorbing portion. The front side member 1 has a rear end coupled to an upper surface of an intermediate portion of the front side member 1 so as to face forward and upward. An upper member 2A is provided which includes an inclined portion 2a that rises in a gentle inclined posture and an impact absorbing portion 2b that is connected to the front end of the inclined portion 2a and extends forward in parallel with the front side member 1. The inclined portion 2a of the upper member 2A supports the toe board portion 30 at the front end of the passenger compartment floor 3 and the dash panel 4 rising from the front edge thereof from below. A dash reinforcement 40 extending in the vehicle width direction along the lower front edge of the dash panel 4 is provided at the upper front end of the inclined portion 2a, and the front end edge of the inclined portion 2a is perpendicular to the front surface of the dash reinforcement 40. It matches.

衝撃吸収部２ｂは、後端の高さ寸法が傾斜部２ａの前端よりも高く設定され、後端の下半部が傾斜部２ａの前端に、上半部がダッシュリィンフォースメント４０の前面にそれぞれ垂直方向に一連に溶接結合されている。またアッパメンバ２Ａの衝撃吸収部２ｂに対応して、フロントサイドメンバ１には、ダッシュパネル４よりも前方へ突出する前端部に、衝突時に軸方向に圧縮変形して衝撃を吸収する衝撃吸収部１０が形成されている。   The shock absorbing portion 2b is set such that the height of the rear end is higher than the front end of the inclined portion 2a, the lower half of the rear end is at the front end of the inclined portion 2a, and the upper half is at the front surface of the dash reinforcement 40. They are welded together in series in the vertical direction. Corresponding to the shock absorbing portion 2b of the upper member 2A, the front side member 1 has a front end portion that protrudes forward from the dash panel 4, and an impact absorbing portion 10 that compresses and deforms in the axial direction at the time of collision to absorb the shock. Is formed.

上記構造とすることにより、車両前面衝突時、フロントサイドメンバ１およびアッパメンバ２Ａは、上記ダッシュパネル４よりも前方位置で、それぞれの衝撃吸収部１０、２ｂが圧縮変形して衝撃を吸収するようにしている。
実公平４−６０７４７号公報 With the above structure, at the time of a vehicle front collision, the front side member 1 and the upper member 2A are in front of the dash panel 4 so that the respective shock absorbing portions 10 and 2b compress and deform to absorb the shock. ing.
No. 4-60747

ところで、車両のオフセット衝突を想定して、車体前面の片側をオフセット・デフォーマブル・バリヤ（以下、ＯＤＢという）に衝突させる衝突実験を行った場合、図８に示すように、衝突当初、アッパメンバ２Ａよりも剛性の高いフロントサイドメンバ１がＯＤＢの下半部を押し潰し、これにより上半部が下向きに傾斜変形する。このためＯＤＢの上半部に衝突したアッパメンバ２Ａの衝撃吸収部２ｂにはその前端から後方へ斜め下向きに衝突荷重Ｆ１（白矢印）が作用することとなる。更に、衝突により車体が前輪を中心に後部が跳ね上がろうとするピッチング現象が発生すると、この傾向が強くなる。   By the way, assuming an offset collision of the vehicle, when a collision experiment is performed in which one side of the front surface of the vehicle body collides with an offset deformable barrier (hereinafter referred to as ODB), as shown in FIG. The front side member 1 having higher rigidity crushes the lower half of the ODB, and the upper half is inclined and deformed downward. For this reason, a collision load F1 (white arrow) acts on the impact absorbing portion 2b of the upper member 2A that has collided with the upper half of the ODB diagonally downward from the front end thereof. Furthermore, this tendency becomes stronger when a pitching phenomenon occurs in which the rear part of the vehicle body jumps around the front wheel due to a collision.

このため従来構造では、アッパメンバ２Ａの衝撃吸収部２ｂに上記斜め下向きの衝突荷重Ｆ１が作用した場合、衝撃吸収部２ｂは傾斜部２ａと連結された根元から下向きに折れ変形することがあった。折れ変形すると衝撃吸収部２ｂは軸方向に圧縮変形せず、衝撃を充分に吸収することができない。衝撃吸収部２ｂでの充分な衝撃吸収効果が発揮されないと、傾斜部２ａに強い衝撃が作用し、傾斜部２ａの前端が上方へ折れ変形するおそれがあり、傾斜部２ａが折れ変形すると、車室フロア３のトーボード部３０およびダッシュパネル４が後方へ移動変形して乗員の足元空間を狭くする。   For this reason, in the conventional structure, when the obliquely downward collision load F1 is applied to the impact absorbing portion 2b of the upper member 2A, the impact absorbing portion 2b may be bent and deformed downward from the base connected to the inclined portion 2a. If it is bent and deformed, the shock absorbing portion 2b is not compressed and deformed in the axial direction, and the shock cannot be sufficiently absorbed. If the impact absorbing effect at the impact absorbing portion 2b is not sufficiently exerted, a strong impact acts on the inclined portion 2a, and the front end of the inclined portion 2a may be bent and deformed. If the inclined portion 2a is bent and deformed, the vehicle The toe board part 30 and the dash panel 4 of the room floor 3 are moved and deformed rearward to narrow the passenger's foot space.

そこで本発明は、車両衝突時に、アッパメンバの前端の衝撃吸収部が軸方向に圧縮変形して効率良く衝撃を吸収することができ、ダッシュパネルおよび車室フロアのトーボード部の後方への移動変形量を抑制して乗員の足元空間を確実に確保できるキャブオーバー型車の車体前部構造を提供することを課題としてなされたものである。   Therefore, according to the present invention, at the time of a vehicle collision, the impact absorbing portion at the front end of the upper member can be compressed and deformed in the axial direction to efficiently absorb the impact, and the rearward deformation amount of the dash panel and the toe board portion of the passenger compartment floor It is an object of the present invention to provide a vehicle body front structure of a cab-over type vehicle that can reliably secure the foot space of an occupant.

本発明は、キャブオーバー型車の車体前後方向に水平に延びる左右のフロントサイドメンバにそれぞれ、その中間部上面から前方かつ上方へ向けて緩やかな傾斜姿勢で立ち上がる傾斜部と、その前端に連結されて上記フロントサイドメンバと平行にフロントサイドメンバのほぼ前端位置まで前方向へ延び、車両衝突時に圧縮変形して衝撃を吸収する衝撃吸収部とからなるアッパメンバを設けたキャブオーバー型車の車体前部構造において、上記アッパメンバの衝撃吸収部の後端と上記傾斜部の前端とを、前下がり傾斜方向に連結せしめる（請求項１）。アッパメンバの衝撃吸収部の後端と傾斜部の前端とを傾斜方向に連結したので、車両正面衝突時、下部がフロントサイドメンバにより押し込まれた相手物体から衝撃吸収部に斜め下向きに作用する衝突荷重は、作用方向とほぼ直交方向の傾斜部の前端で受けられるので、衝撃吸収部は屈曲変形せずに、ほぼ軸方向に圧縮変形して効率良く衝撃を吸収することができる。   The present invention is connected to the left and right front side members extending horizontally in the longitudinal direction of the vehicle body of the cab-over type vehicle, respectively, with an inclined portion rising in a gentle inclined posture from the upper surface of the middle portion thereof toward the front and upward, and a front end thereof. The vehicle body front portion of the cab-over type vehicle is provided with an upper member that extends in the forward direction substantially parallel to the front side member to the substantially front end position of the front side member, and that includes an impact absorbing portion that compresses and deforms to absorb the impact in the event of a vehicle collision. In the structure, the rear end of the impact absorbing portion of the upper member and the front end of the inclined portion are connected in the forward downward inclined direction (Claim 1). Since the rear end of the shock absorbing part of the upper member and the front end of the inclined part are connected in the inclined direction, the collision load that acts obliquely downward on the shock absorbing part from the counterpart object whose lower part is pushed in by the front side member at the time of frontal collision of the vehicle Is received at the front end of the inclined portion substantially perpendicular to the action direction, the impact absorbing portion can be compressed and deformed substantially in the axial direction without being bent and deformed, and the impact can be efficiently absorbed.

上記衝撃吸収部はその高さ寸法を上記傾斜部よりも高く形成し、上記衝撃吸収部の後端の下半部と上記傾斜部の前端とを前下がり傾斜方向に連結し、上記衝撃吸収部の後端の上半部を、上記傾斜部の上面前端から起立するダッシュパネルの下縁に沿って車幅方向に設けて上記左右の傾斜部の上面前端間に架けわたしたダッシュリィンフォースメントに垂直方向に連結せしめる（請求項２）。衝撃吸収部は後端の下半部を傾斜方向に傾斜部前端に連結するとともに、上半部をダッシュリィンフォースメントに垂直方向に連結したので、衝撃吸収部にほぼ水平後方へ衝突荷重が作用しても上記ダッシュリィンフォースメントが上記荷重をほぼ直交方向に受けることができる。従って衝撃吸収部は、斜め下向きまたは水平方向のいずれの衝突荷重に対しても軸方向に圧縮変形して衝撃吸収性能を発揮することができる。   The impact absorbing portion is formed with a height higher than that of the inclined portion, and a lower half portion of the rear end of the impact absorbing portion and a front end of the inclined portion are connected in a forward downward inclined direction, and the impact absorbing portion The upper half of the rear end is provided in the vehicle width direction along the lower edge of the dash panel rising from the front end of the upper surface of the inclined part, and the dash reinforcement that spans between the upper front ends of the left and right inclined parts. They are connected in the vertical direction (claim 2). The shock absorbing part is connected with the lower half of the rear end in the inclined direction to the front end of the inclined part, and the upper half is connected to the dash reinforcement in the vertical direction, so a collision load acts on the shock absorbing part almost horizontally rearward. Even so, the dash reinforcement can receive the load in a substantially orthogonal direction. Therefore, the impact absorbing portion can exhibit the impact absorbing performance by compressing and deforming in the axial direction against any collision load in the diagonally downward direction or the horizontal direction.

前下がり傾斜方向に互いに連結せしめる閉断面の上記衝撃吸収部の後端と上記傾斜部の前端の外周にはそれぞれ外方へ突出する結合フランジを形成し、上記衝撃吸収部と傾斜部との間に両者を仕切るように金属プレートを設け、上記衝撃吸収部の結合フランジと傾斜部の結合フランジとを上記金属プレートを介して連結せしめる（請求項３）。金属プレートにより衝撃吸収部と傾斜部との連結部の連結強度が強化され、衝突時に傾斜部に対して衝撃吸収部が横ズレせず、斜め下向きの衝突荷重を金属プレートが確実に受けるので衝撃吸収性能を向上させることができる。   A joint flange that protrudes outward is formed on the outer periphery of the rear end of the shock absorbing portion and the front end of the inclined portion, which are connected to each other in the forward and downward inclined direction, and between the shock absorbing portion and the inclined portion. A metal plate is provided so as to partition the two, and the coupling flange of the shock absorbing portion and the coupling flange of the inclined portion are connected via the metal plate. The metal plate strengthens the connection strength between the shock absorbing part and the inclined part, and the shock absorbing part does not shift laterally with respect to the inclined part at the time of collision, and the metal plate reliably receives the oblique downward collision load. Absorption performance can be improved.

本発明によれば、車両衝突時に、アッパメンバの前端の衝撃吸収部が確実に軸方向に圧縮変形して効率良く衝撃を吸収することができ、ダッシュパネルおよび車室フロアのトーボード部の後方への移動変形量を抑制して乗員の足元空間を確保することができる。   According to the present invention, at the time of a vehicle collision, the impact absorbing portion at the front end of the upper member can be reliably compressed and deformed in the axial direction to efficiently absorb the impact, and the dash panel and the rear floor of the toeboard portion of the passenger compartment floor can be absorbed. It is possible to secure the foot space of the occupant by suppressing the amount of movement deformation.

図１に示すように、キャブオーバー型車の車体前部には、キャブの車室フロア３の下方位置に、キャブを支える車体の骨格部材たる左右のフロントサイドメンバ１が車体前後方向に延設してある。車室フロア３のフロア前半部は、フロントシート（図略）が設置されるフロア後半部よりも一段低くされ、フロントシートに着座する乗員の足元のトーボード部３０を形成している。   As shown in FIG. 1, left and right front side members 1, which are skeleton members of a vehicle body that supports a cab, extend in the front-rear direction of the vehicle body at the lower part of the cabin floor 3 of the cab at the vehicle body front portion of the cab-over type vehicle. It is. The front half of the passenger compartment floor 3 is one step lower than the rear half of the floor on which the front seat (not shown) is installed, and forms a toe board portion 30 at the feet of the passenger sitting on the front seat.

トーボード部３０の前縁には、キャブの車室前壁を形成する縦壁状のダッシュパネル４が立設してある。ダッシュパネル４の前面下縁には車幅方向に延びるダッシュリィンフォースメント４０が設けてある。ダッシュリィンフォースメント４０は後方へ向かって開口する断面ほぼコ字形の長尺体で、上下の端縁をそれぞれダッシュパネル４に結合してダッシュパネル４とで閉断面をなす。   On the front edge of the toe board portion 30, a vertical wall-shaped dash panel 4 is formed so as to form a front wall of the cabin of the cab. A dash reinforcement 40 extending in the vehicle width direction is provided on the lower front edge of the dash panel 4. The dash reinforcement 40 is a long body having a substantially U-shaped cross section that opens rearward. The upper and lower edges of the dash reinforcement 40 are connected to the dash panel 4 to form a closed cross section with the dash panel 4.

左右のフロントサイドメンバ１は同一構造で、一方のフロントサイドメンバ１を中心に説明する。図１および図３に示すように、フロントサイドメンバ１は、断面ほぼＵ字形をなすメンバ本体１１と、その上部開口を塞ぐアッパプレート１２からなる閉断面構造をなす。フロントサイドメンバ１の内部には、長手方向に沿って閉断面を上下に仕切るリィンフォースメント１３を内設して剛性が強化してある。   The left and right front side members 1 have the same structure, and one front side member 1 will be mainly described. As shown in FIGS. 1 and 3, the front side member 1 has a closed cross-sectional structure including a member main body 11 having a substantially U-shaped cross section and an upper plate 12 that closes the upper opening thereof. Inside the front side member 1, a reinforcement 13 for partitioning the closed cross section vertically along the longitudinal direction is provided to enhance the rigidity.

ダッシュパネル４よりも車体前方へ延出するフロントサイドメンバ１の前端部は、その下面に前後方向に所定の間隔をおいて複数のクラッシュビード１４を設け、車両衝突時に軸方向に圧縮変形して衝撃を吸収する衝撃吸収部１０としてある。   The front end of the front side member 1 that extends forward of the vehicle body from the dash panel 4 is provided with a plurality of crash beads 14 at a predetermined interval in the front-rear direction on the lower surface thereof, and is compressed and deformed in the axial direction at the time of a vehicle collision. The shock absorbing unit 10 absorbs the shock.

フロントサイドメンバ１の前端末には、車幅方向に沿って左右のメンバ間を架けわたすフロントクロスメンバ６が設けてある。   The front terminal of the front side member 1 is provided with a front cross member 6 that bridges the left and right members along the vehicle width direction.

フロントサイドメンバ１には前方かつ上方へ分岐するアッパメンバ２が設けてある。アッパメンバ２は、後端２０をフロントサイドメンバ１の前後方向の中間部に結合して、該結合部から上方かつ前方へ向かって緩やかな傾斜姿勢で立ち上がる傾斜部２ａと、傾斜部２ａの前端からフロントサイドメンバ１の衝撃吸収部１０と平行に前方へフロントサイドメンバ１の前端とほぼ同等位置まで延びる後述の衝撃吸収部２ｂとで構成してある。   The front side member 1 is provided with an upper member 2 that branches forward and upward. The upper member 2 has a rear end 20 coupled to the middle portion in the front-rear direction of the front side member 1, an inclined portion 2a that rises upward and forward from the coupling portion, and a front end of the inclined portion 2a. It is comprised by the below-mentioned impact absorption part 2b extended in parallel with the impact absorption part 10 of the front side member 1 to the front substantially the same position as the front end of the front side member 1.

図１および図５に示すように、傾斜部２ａは、断面逆ハット形をなすメンバ本体２１の上部開口を、アッパプレート２２で塞いだ閉断面構造をなす。傾斜部２ａはフロントサイドメンバ１よりも板厚が薄めの部材で構成してある。傾斜部２ａはその後端２０を、フロントサイドメンバ１の前後中間位置で、一部、そのアッパプレート１２を設けずに開断面構造とした部位のメンバ本体１１内へその上方から嵌入し、アッパメンバ２の後端２０の左右の側面をフロントサイドメンバ１の内面に重ね合わせて溶接固定してある。   As shown in FIGS. 1 and 5, the inclined portion 2 a has a closed cross-sectional structure in which the upper opening of the member main body 21 having a cross-sectional inverted hat shape is closed with an upper plate 22. The inclined portion 2a is formed of a member having a thinner plate thickness than the front side member 1. The inclined portion 2a is inserted from the upper end 2 into the member main body 11 of the portion having an open cross-sectional structure without providing the upper plate 12 at the rear end 20 at the front and rear intermediate position of the front side member 1 from above. The left and right side surfaces of the rear end 20 are overlapped with the inner surface of the front side member 1 and fixed by welding.

傾斜部２ａの一般部は、その上面に車室フロア３のトーボード部３０を配置し、傾斜部２ａのメンバ本体２１の左右の側縁フランジおよびアッパプレート２２の左右の両側縁とトーボード部３０とを一体に結合して、トーボード部３０を下方より支えている。傾斜部２ａの上面前端は、トーボード部３０の前縁から起立するダッシュパネル４と、その下縁に設置したダッシュリィンフォースメント４０が結合してある。ダッシュリィンフォースメント４０はその底壁が傾斜部２ａの上面前端に結合してあり、ダッシュリィンフォースメント４０の前面は傾斜部２ａの上面前端縁から垂直方向に起立している。尚、ダッシュリィンフォースメント４０は左右のアッパメンバ２の傾斜部２ａの上面前端間を車幅方向に架けわたしている。   The general portion of the inclined portion 2a includes the toe board portion 30 of the passenger compartment floor 3 on the upper surface thereof, the left and right side edge flanges of the member main body 21 of the inclined portion 2a, the left and right side edges of the upper plate 22, and the toe board portion 30. Are integrally coupled to support the toe board portion 30 from below. A dash panel 4 rising from the front edge of the toe board portion 30 and a dash reinforcement 40 installed on the lower edge thereof are coupled to the upper front end of the inclined portion 2a. The bottom wall of the dash reinforcement 40 is coupled to the upper front end of the inclined portion 2a, and the front surface of the dash reinforcement 40 stands upright from the upper front edge of the inclined portion 2a. The dash reinforcement 40 extends between the front end of the upper surface of the inclined portion 2a of the left and right upper members 2 in the vehicle width direction.

図１および図２に示すように、傾斜部２ａの前端縁は、ダッシュリィンフォースメント４０の前面下縁から、垂直方向に対して所定の傾斜角度をなす前下がり傾斜方向に形成してある。前端縁の傾斜角度は、垂直方向に対して約２０°から３０°の範囲に設定される。前端縁には左右両側に外側方向へ向けて直角に折り曲げた結合フランジ２３が形成してある。   As shown in FIG. 1 and FIG. 2, the front end edge of the inclined portion 2 a is formed from the lower front edge of the dash reinforcement 40 in a forward downward inclination direction that forms a predetermined inclination angle with respect to the vertical direction. The inclination angle of the front edge is set in a range of about 20 ° to 30 ° with respect to the vertical direction. The front end edge is formed with a coupling flange 23 bent at a right angle toward the outer side on both the left and right sides.

そして、傾斜部２ａの前端縁は金属プレート５により閉じてある。金属プレート５は、結合フランジ２３を含む傾斜部２ａの前端の形状・寸法に合わせてあり、金属プレート５の裏面側の左右両側部を傾斜部２ａの結合フランジ２３の前面に重ね合わせて溶接結合してある。   The front end edge of the inclined portion 2 a is closed by the metal plate 5. The metal plate 5 is matched to the shape and dimensions of the front end of the inclined portion 2a including the coupling flange 23, and the right and left sides on the back side of the metal plate 5 are overlapped with the front surface of the coupling flange 23 of the inclined portion 2a. It is.

アッパメンバ２の衝撃吸収部２ｂは、図１ないし図４に示すように、断面ほぼＵ字形の本体部２４とその上部開口を塞ぐアッパプレート２５とで閉断面構造で、傾斜部２ａの板厚とほぼ同等または薄めの部材で構成してある。そして、衝撃吸収部２ｂには側面および下面に前後方向に所定の間隔をおいて複数のクラッシュビード２８が設けてあり、衝撃吸収部２ｂはフロントサイドメンバ１の衝撃吸収部１０と同様に車両衝突時に軸方向に圧縮変形して衝撃を吸収するようにしてある。   As shown in FIGS. 1 to 4, the shock absorbing portion 2b of the upper member 2 has a closed cross-sectional structure composed of a main body portion 24 having a substantially U-shaped cross section and an upper plate 25 that closes the upper opening thereof. It is composed of substantially the same or thinner members. The shock absorbing portion 2b is provided with a plurality of crash beads 28 at predetermined intervals in the front-rear direction on the side surface and the lower surface, and the shock absorbing portion 2b is a vehicle collision like the shock absorbing portion 10 of the front side member 1. Sometimes it is compressed and deformed in the axial direction to absorb the impact.

衝撃吸収部２ｂの高さ寸法は傾斜部２ａのそれよりも高く設定してあり、衝撃吸収部２ｂの後端縁の高さ寸法は傾斜部２ａの前端下縁からダッシュリィンフォースメント４０の前面上縁までの寸法に合わせてある。   The height of the shock absorbing portion 2b is set higher than that of the inclined portion 2a, and the height of the rear end edge of the shock absorbing portion 2b is from the lower edge of the front end of the inclined portion 2a to the front surface of the dash reinforcement 40. It is matched to the dimension up to the upper edge.

衝撃吸収部２ｂの後端縁は、上半部がダッシュリィンフォースメント４０の前面に対応して垂直方向に形成してあり、左右両側には外側方向へ向けて直角に折り曲げた結合フランジ２６が形成してある。また、下半部は傾斜部２ａの前端縁に対応して前下がり傾斜方向に形成してあり、左右両側には傾斜部２ａの結合フランジ２３に対応して外側へ向けて直角に折り曲げた結合フランジ２７が形成してある。   The rear end edge of the shock absorbing portion 2b has an upper half portion formed in a vertical direction corresponding to the front surface of the dashboard reinforcement 40, and a coupling flange 26 bent at a right angle toward the outer side on the left and right sides. It is formed. Further, the lower half is formed in a forward and downward inclined direction corresponding to the front end edge of the inclined portion 2a, and the right and left sides are connected to each other at a right angle corresponding to the connecting flange 23 of the inclined portion 2a. A flange 27 is formed.

そして、衝撃吸収部２ｂは、後端縁の上半部の結合フランジ２６をダッシュリィンフォースメント４０の前面に重ね合わせて溶接結合するとともに、下半部の結合フランジ２７を金属プレート５の前面左右両側部に重ね合わせ、金属プレート５と傾斜部２ａの結合フランジ２３との結合部と一体に溶接結合してある。   The shock absorbing portion 2b is welded and joined with the coupling flange 26 in the upper half of the rear edge on the front surface of the dash reinforcement 40, and the coupling flange 27 in the lower half is connected to the left and right sides of the front surface of the metal plate 5. They are overlapped on both sides and welded together integrally with the connecting portion between the metal plate 5 and the connecting flange 23 of the inclined portion 2a.

アッパメンバ２の前端末には、フロントサイドメンバ１と同様、車幅方向に沿って左右のメンバ間を架けわたすフロントクロスメンバ６ａが設けてあり、フロントサイドメンバ１側のクロスメンバ６とでフロントバンパーを支えるようにしている。   Like the front side member 1, the front end of the upper member 2 is provided with a front cross member 6a that spans between the left and right members along the vehicle width direction. A front bumper is attached to the cross member 6 on the front side member 1 side. I try to support it.

本実施形態の車体前部構造によれば、車体前面の片側が相手物体に衝突した場合、アッパメンバ２の衝撃吸収部２ｂに斜め下向きの衝突荷重Ｆ１が作用しても、荷重Ｆ１はその作用方向とほぼ直交する傾斜部２ａの前端縁で受けられる。従って、図６に示すように、衝撃吸収部２ｂはその根元から折れ曲がらずほぼ軸方向に圧縮変形して衝撃吸収性能を充分に発揮でき、ダッシュパネル４およびトーボード部３０の後方への移動変形を抑制することができる。尚、アッパメンバ２の衝撃吸収部２ｂおよびフロントサイドメンバ１の前端部１０で吸収しきれないような大衝突荷重が作用した場合に備えて、アッパメンバ２の傾斜部２ａ前部とフロントサイドメンバ１とを縦方向に連結する連結部材を設置することが望ましい。   According to the vehicle body front part structure of the present embodiment, when one side of the front surface of the vehicle body collides with a counterpart object, even if a diagonally downward collision load F1 is applied to the impact absorbing portion 2b of the upper member 2, the load F1 is applied in the direction of operation. And is received at the front end edge of the inclined portion 2a substantially orthogonal thereto. Therefore, as shown in FIG. 6, the shock absorbing portion 2b is not bent from its base and can be compressed and deformed substantially in the axial direction to sufficiently exhibit shock absorbing performance, and the dash panel 4 and the toe board portion 30 are moved and deformed rearward. Can be suppressed. In addition, in preparation for a case where a large collision load is applied that cannot be absorbed by the shock absorbing portion 2b of the upper member 2 and the front end portion 10 of the front side member 1, the front portion of the inclined portion 2a of the upper member 2, the front side member 1, It is desirable to install a connecting member that connects the two in the vertical direction.

また、衝撃吸収部２ｂと傾斜部２ａとの間に、両者を仕切る金属プレート５を設け、金属プレート５を介して衝撃吸収部２ｂの後端縁と傾斜部２ａの前端縁とを連結することで、衝撃吸収部２ｂと傾斜部２ａとの連結強度を強化でき、衝突時の傾斜部２ａに対する衝撃吸収部２ｂの横ズレが防止でき、より確実に衝撃吸収部２ｂを圧縮変形させて衝撃吸収性能を向上することができる。   Also, a metal plate 5 is provided between the shock absorbing portion 2b and the inclined portion 2a, and the rear end edge of the shock absorbing portion 2b and the front end edge of the inclined portion 2a are connected via the metal plate 5. Thus, the connection strength between the shock absorbing portion 2b and the inclined portion 2a can be strengthened, the lateral displacement of the shock absorbing portion 2b with respect to the inclined portion 2a at the time of collision can be prevented, and the shock absorbing portion 2b can be more reliably compressed and deformed to absorb the shock. The performance can be improved.

衝突相手物体が強固なコンクリート壁等の場合には、衝突時にフロントサイドメンバ１によって押し込まれず、アッパメンバ２の衝撃吸収部２ａにもほぼ水平方向の衝突荷重が作用するが、荷重は主としてダッシュリィンフォースメント４０の垂直面で受けられて、傾斜方向の連結部におけるズレの発生が防止されるから、衝撃吸収部２ａによる衝撃吸収作用は充分に発揮される。   When the colliding object is a strong concrete wall or the like, it is not pushed in by the front side member 1 at the time of collision, and a substantially horizontal collision load acts on the shock absorbing portion 2a of the upper member 2, but the load is mainly dash reinforcement. Since it is received by the vertical surface of the ment 40 and the occurrence of displacement at the connecting portion in the inclined direction is prevented, the shock absorbing action by the shock absorbing portion 2a is sufficiently exhibited.

図１は本発明を適用した車体前部構造の概略側面図である。FIG. 1 is a schematic side view of a vehicle body front structure to which the present invention is applied. 図１のII−II線に沿う断面図である。It is sectional drawing which follows the II-II line of FIG. 図１のIII −III 線に沿う縦断面図である。It is a longitudinal cross-sectional view which follows the III-III line | wire of FIG. 図１のIV−IV線に沿う縦断面図である。It is a longitudinal cross-sectional view which follows the IV-IV line of FIG. 図１のＶ−Ｖ線に沿う縦断面図である。It is a longitudinal cross-sectional view which follows the VV line of FIG. 本発明の車体前部構造をＯＤＢに衝突させた状態を示す概略側面図である。It is a schematic side view which shows the state which made the vehicle body front part structure of this invention collide with ODB. 従来の車体前部構造の概略側面図である。It is a schematic side view of the conventional vehicle body front part structure. 図６に対応して、従来の車体前部構造の衝突状態を示す概略側面図である。FIG. 7 is a schematic side view showing a collision state of the conventional vehicle body front structure corresponding to FIG. 6.

符号の説明Explanation of symbols

１ フロントサイドメンバ
２ アッパメンバ
２ａ 傾斜部
２ｂ 衝撃吸収部
２３ 傾斜部の結合フランジ
２７ 衝撃吸収部の結合フランジ
３ 車室フロア
３０ トーボード部
４ ダッシュパネル
４０ ダッシュリィンフォースメント
５ 金属プレート
DESCRIPTION OF SYMBOLS 1 Front side member 2 Upper member 2a Inclined part 2b Shock absorbing part 23 Connecting flange of inclined part 27 Connecting flange of shock absorbing part 3 Car floor 30 Toe board part 4 Dash panel 40 Dash reinforcement 5 Metal plate

Claims (3)

キャブオーバー型車の車体前後方向に水平に延びる左右のフロントサイドメンバにそれぞれ、その中間部上面から前方かつ上方へ向けて緩やかな傾斜姿勢で立ち上がる傾斜部と、その前端に連結されて上記フロントサイドメンバと平行にフロントサイドメンバのほぼ前端位置まで前方向へ延び、車両衝突時に圧縮変形して衝撃を吸収する衝撃吸収部とからなるアッパメンバを設けたキャブオーバー型車の車体前部構造において、
上記アッパメンバの衝撃吸収部の後端と上記傾斜部の前端とを、前下がり傾斜方向に連結せしめたことを特徴とするキャブオーバー型車の車体前部構造。 The left and right front side members that extend horizontally in the longitudinal direction of the cab-over type vehicle are respectively connected to the front end of the front side that is connected to the front end of an inclined portion that rises gently from the upper surface of the middle portion toward the front and upward. In the vehicle front structure of the cab over type vehicle provided with an upper member that extends in the forward direction to a substantially front end position of the front side member in parallel with the member, and that includes an impact absorbing portion that compresses and deforms and absorbs an impact at the time of a vehicle collision
A vehicle body front part structure of a cab-over type vehicle, characterized in that a rear end of an impact absorbing portion of the upper member and a front end of the inclined portion are connected in a forward downward inclined direction. 上記衝撃吸収部はその高さ寸法を上記傾斜部よりも高く形成し、上記衝撃吸収部の後端の下半部と上記傾斜部の前端とを前下がり傾斜方向に連結し、上記衝撃吸収部の後端の上半部を、上記傾斜部の上面前端から起立するダッシュパネルの下縁に沿って車幅方向に設けて上記左右の傾斜部の上面前端間に架けわたしたダッシュリィンフォースメントに垂直方向に連結せしめた請求項１に記載のキャブオーバー型車の車体前部構造。   The impact absorbing portion is formed with a height higher than that of the inclined portion, and a lower half portion of the rear end of the impact absorbing portion and a front end of the inclined portion are connected in a forward downward inclined direction, and the impact absorbing portion The upper half of the rear end is provided in the vehicle width direction along the lower edge of the dash panel rising from the front end of the upper surface of the inclined part, and the dash reinforcement that spans between the upper front ends of the left and right inclined parts. The vehicle body front part structure of the cab over type vehicle according to claim 1, wherein the vehicle body front structure is connected in a vertical direction. 前下がり傾斜方向に連結せしめる閉断面の上記衝撃吸収部の後端と上記傾斜部の前端の外周にはそれぞれ外方へ突出する結合フランジを形成し、上記衝撃吸収部と傾斜部との間に両者を仕切るように金属プレートを設け、上記衝撃吸収部の結合フランジと傾斜部の結合フランジとを上記金属プレートを介して連結した請求項１ないし２に記載のキャブオーバー型車の車体前部構造。
A joint flange projecting outward is formed on each of the rear end of the shock absorbing portion having a closed cross-section to be connected in the forward and downward inclined direction and the outer periphery of the front end of the inclined portion, and is formed between the shock absorbing portion and the inclined portion. 3. A front body structure of a cab-over type vehicle according to claim 1, wherein a metal plate is provided so as to partition the two, and a coupling flange of the shock absorbing portion and a coupling flange of the inclined portion are connected via the metal plate. .
JP2003358655A 2003-10-20 2003-10-20 Front body structure of cab-over type car Expired - Lifetime JP3960293B2 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011048694A1 (en) * 2009-10-23 2011-04-28 トヨタ自動車株式会社 Vehicle body structure
JP2014046760A (en) * 2012-08-30 2014-03-17 Mitsubishi Motors Corp Vehicle body front part frame structure
JP7517267B2 (en) 2021-06-22 2024-07-17 トヨタ自動車株式会社 Vehicle front structure

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011048694A1 (en) * 2009-10-23 2011-04-28 トヨタ自動車株式会社 Vehicle body structure
CN102985313A (en) * 2009-10-23 2013-03-20 丰田自动车株式会社 Vehicle body structure
US8523273B2 (en) 2009-10-23 2013-09-03 Toyota Jidosha Kabushiki Kaisha Vehicle body structure
CN102985313B (en) * 2009-10-23 2014-05-21 丰田自动车株式会社 Vehicle body structure
DE112009005339B4 (en) * 2009-10-23 2015-04-02 Toyota Jidosha Kabushiki Kaisha Vehicle body structure
JP2014046760A (en) * 2012-08-30 2014-03-17 Mitsubishi Motors Corp Vehicle body front part frame structure
JP7517267B2 (en) 2021-06-22 2024-07-17 トヨタ自動車株式会社 Vehicle front structure

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