JP3873979B2 - Body front structure - Google Patents

Body front structure Download PDF

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JP3873979B2
JP3873979B2 JP2004029276A JP2004029276A JP3873979B2 JP 3873979 B2 JP3873979 B2 JP 3873979B2 JP 2004029276 A JP2004029276 A JP 2004029276A JP 2004029276 A JP2004029276 A JP 2004029276A JP 3873979 B2 JP3873979 B2 JP 3873979B2
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wall
side member
front side
end portion
bracket
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JP2005219609A (en
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正人 小林
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Nissan Motor Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2206/00—Indexing codes related to the manufacturing of suspensions: constructional features, the materials used, procedures or tools
    • B60G2206/01—Constructional features of suspension elements, e.g. arms, dampers, springs
    • B60G2206/016—Constructional features of suspension elements, e.g. arms, dampers, springs allowing controlled deformation during collision

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Description

本発明は、自動車の車体前部構造に関する。   The present invention relates to a vehicle body front structure.

自動車の車体前部構造の中には、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した１対のフロントサイドメンバの下方に、エンジン，トランスミッションからなる駆動ユニットを支持するサブフレームを配置し、車両の前面衝突時にフロントサイドメンバの軸方向の圧潰変形に伴って、サブフレームをその前，後端部とフロントサイドメンバの前，後端部との締結固定部を支持点として中央部分を下方にくの字状に折れ曲がり変形させることで衝突エネルギーを吸収すると共に、このサブフレームのくの字状の折れ曲がり変形によって駆動ユニットを下方に引き落して、該駆動ユニットがダッシュパネルに干渉するのを回避するようにしたものが知られている（例えば、特許文献１参照）。
特開２００３−１１８６３２号公報（第５頁、第６図） In the vehicle body front structure, there is a subframe that supports a drive unit consisting of an engine and a transmission below a pair of front side members that extend in the vehicle longitudinal direction on both sides of the front compartment in the vehicle width direction. With the front side member axially crushed and deformed in the event of a frontal collision of the vehicle, the subframe is used as a supporting point, and the fastening and fixing parts between the rear end and the front and rear ends of the front side member are used as supporting points. The center part is bent and deformed downward in a U-shape to absorb the collision energy, and the sub-frame is bent in a U-shape so that the drive unit is pulled down, and the drive unit is moved to the dash panel. A device that avoids interference is known (for example, see Patent Document 1).
JP 2003-118632 A (page 5, FIG. 6)

車両の前面衝突時にサブフレームが下向きにくの字状に折れ曲がり変形する際に、特に折れ曲がりによる角度変形が大きくなる傾向にあるサブフレームの前側部分では曲げモーメントが大きくなることから、該サブフレームの前端部をフロントサイドメンバの前端部に締結しているボルトに大きな剪断力が作用し、該ボルトが破断してサブフレームの折れ曲がり変形が適正に行われなくなる可能性がある。   When a subframe bends and deforms downward in the shape of a dogleg when a vehicle collides with the front, the bending moment increases especially at the front part of the subframe, which tends to increase angular deformation due to bending. There is a possibility that a large shearing force acts on the bolt that fastens the front end portion to the front end portion of the front side member, the bolt breaks, and the subframe is not properly bent and deformed.

そこで、本発明はサブフレームが下向きにくの字状に折れ曲がり変形する際に、該サブフレームの前端部の締結ボルトに大きな剪断力が作用するのを回避して締結状態を維持し、サブフレームの折れ曲がり変形を適正に行わせることができる車体前部構造を提供するものである。   Accordingly, the present invention avoids the application of a large shearing force to the fastening bolt at the front end of the subframe when the subframe is bent downward and deformed in a U-shape, and maintains the fastening state. It is intended to provide a vehicle body front part structure that can bend and deform appropriately.

本発明にあっては、車体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１対のフロントサイドメンバと、
前記１対のフロントサイドメンバよりも下方でほぼ水平に配置されて、後端部を各フロントサイドメンバの後端部下面に締結固定すると共に、前端部を各フロントサイドメンバの前端部下面に接合配置したブラケットに締結固定して、前後方向中間部分に駆動ユニットの支持点を設定したサブフレームと、を備えた車体前部構造であって、
前記ブラケットは、少なくとも下面にサブフレームの前端部を締結固定する底壁と、
該底壁の前，後端部から立設されて上端をフロントサイドメンバの前端部下面に結合した前壁および後壁と、
前壁の上端部と、底壁と後壁との連設隅部とに跨って前傾状態に設けた斜壁と、を備え、
前記フロントサイドメンバの前端部に、車両の前面衝突時に該フロントサイドメンバの軸方向の圧潰変形に伴って後退して、前記ブラケットの前壁に衝接する変形促進用の突起部を設けたことを最も主要な特徴とする。 In the present invention, a pair of front side members that extend in the vehicle longitudinal direction on both sides in the vehicle width direction of the front compartment of the vehicle body,
Located substantially horizontally below the pair of front side members, the rear end portion is fastened and fixed to the lower surface of the rear end portion of each front side member, and the front end portion is joined to the lower surface of the front end portion of each front side member. A vehicle body front structure comprising: a subframe that is fastened and fixed to the disposed bracket, and a support point of the drive unit is set at an intermediate portion in the front-rear direction;
The bracket includes at least a bottom wall for fastening and fixing the front end of the subframe to the lower surface;
A front wall and a rear wall that are erected from the front and rear end portions of the bottom wall and have an upper end coupled to a lower surface of the front end portion of the front side member;
An inclined wall provided in a forward inclined state straddling the upper end of the front wall and the connecting corner of the bottom wall and the rear wall,
The front end of the front side member is provided with a deformation-promoting protrusion that retreats along with the axial deformation of the front side member during a frontal collision of the vehicle and abuts against the front wall of the bracket. The most important feature.

本発明によれば、車両の前面衝突時にフロントサイドメンバが軸方向に圧潰変形すると、サブフレームがその前，後端部の締結固定部を支持点にして前後方向中間部の駆動ユニットの支持点を頂点に下向きにくの字状に折れ曲がり変形し、ブラケット下面に締結固定したサブフレームの前端部には上向きの反力が発生する。 According to the present invention, when the CFCs preparative side member during a frontal collision of the vehicle is crushed deformed in the axial direction, the sub-frame before, support of the drive unit in the front-rear direction intermediate portion to the fastening fixing portion of the rear end portion to the supporting point It deformed bending the apex points downwards meat-shaped, the reaction force of the upward occurs at the front end of the sub-frame fastened to the bracket lower surface.

これと同時に、フロントサイドメンバの軸圧潰により突起部がブラケットの前壁に衝接することにより、該前壁がいち早く座屈変形して、底壁がその後端と後壁および斜壁との連設部を支点にしてサブフレームの前端部と一体的に上向きに折れ曲がり変形し、該底壁とサブフレーム前端部との締結固定点に剪断荷重が作用するのを回避して締結状態を維持することができる。 At the same time, by the projection portion is abuts the front wall of the bracket by a shaft collapse of the front side member, the front wall and quickly buckled, the bottom wall is continuously provided between the rear wall and inclined wall and a rear end The upper end of the subframe bends upward and deforms with the fulcrum as a fulcrum, and the fastening state is maintained by avoiding the application of a shear load to the fastening fixing point between the bottom wall and the front end of the subframe. Can do.

この結果、サブフレームの前端部がブラケットから脱落するのを防止して、該サブフレームのくの字状の折れ曲がり変形を適正に行わせて衝突エネルギーの吸収効果を発揮させることができると共に、駆動ユニットを下方に引き落してダッシュパネルに干渉するのを回避することができる。   As a result, the front end portion of the subframe is prevented from falling off the bracket, and the subframe can be bent and deformed appropriately to exhibit a collision energy absorption effect and drive. The unit can be pulled down to avoid interfering with the dash panel.

以下、本発明の一実施形態を図面と共に詳述する。   Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

図１〜図６は本発明の一実施形態を示し、図１はフロントサイドメンバとサブフレームの配設状態を示す側面図、図２は衝突初期における車体前部の変形状態を示す図１と同様の側面図、図３は衝突による車体前部の変形が進行した状態を示す図１と同様の側面図、図４は図１におけるブラケットの取付け状態を示す下方から見た斜視図、図５は図２におけるサブフレーム前端部の連結部分を示す側面図、図６は図３におけるサブフレーム前端部の連結部分を示す側面図である。   1 to 6 show an embodiment of the present invention, FIG. 1 is a side view showing a state of arrangement of a front side member and a subframe, and FIG. 2 is a view showing a deformation state of a front part of a vehicle body at the initial stage of a collision. 3 is a side view similar to FIG. 1 showing a state in which the deformation of the front part of the vehicle body has progressed due to a collision. FIG. 4 is a perspective view showing the mounting state of the bracket in FIG. FIG. 6 is a side view showing the connecting portion of the front end portion of the subframe in FIG. 2, and FIG. 6 is a side view showing the connecting portion of the front end portion of the subframe in FIG.

本実施形態の車体前部構造は図１に示すように、車両のフロントコンパートメントＦ・Ｃの車幅方向両側部に、車両の前面衝突時における主要なエネルギー吸収部材であるフロントサイドメンバ１を車体前後方向に延在配置してある。   As shown in FIG. 1, the vehicle body front portion structure of the present embodiment includes a front side member 1 that is a main energy absorbing member at the time of a frontal collision of the vehicle on both sides in the vehicle width direction of the front compartments F and C of the vehicle. It extends in the front-rear direction.

このフロントサイドメンバ１は、例えば矩形の閉断面に形成してあり、直状のフロント部１Ａと、フロント部１Ａの後端部から斜め下方に傾斜したキックアップ部１Ｂと、該キックアップ部１Ｂの後端部から後方に延びるエクステンション部１Ｃとを備えている。   The front side member 1 is formed, for example, in a rectangular closed cross section, and includes a straight front portion 1A, a kick-up portion 1B inclined obliquely downward from a rear end portion of the front portion 1A, and the kick-up portion 1B. And an extension portion 1C extending rearward from the rear end portion.

前記キックアップ部１Ｂはダッシュパネル２のトーボード部２ａの傾斜に合わせて傾斜成形してあって、該トーボード部２ａの下面に接合してあり、エクステンション部１Ｃはトーボード部２ａに続くフロアパネル３の下面に接合してある。   The kick-up part 1B is formed in accordance with the inclination of the toe board part 2a of the dash panel 2, and is joined to the lower surface of the toe board part 2a, and the extension part 1C is the floor panel 3 following the toe board part 2a. Bonded to the bottom surface.

また、フロント部１Ａの前端にはフロントバンパーのパンバースティ４を同一軸線上に結合配置してある。   In addition, a pan bumper 4 of a front bumper is coupled to the front end of the front portion 1A on the same axis.

フロントコンパートメントＦ・Ｃの下側には、前記フロントサイドメンバ１よりも下方でほぼ水平に配置されて、エンジン，トランスミッション等からなる駆動ユニット５の下部を支持するサブフレーム６を配設してある。   Below the front compartments F and C, a sub-frame 6 is disposed substantially horizontally below the front side member 1 and supports the lower part of the drive unit 5 comprising an engine, a transmission, and the like. .

このサブフレーム６は前記１対のフロントサイドメンバ１の直下で前後方向に延在する１対の直状の側部フレーム６Ａを備えていて、該側部フレーム６Ａの後端部間に後側フレームを一体に設けた平面コ字形に、もしくは、側部フレーム６Ａの前端部間にも前側フレームを一体に設けた平面井桁状に形成される。   The sub-frame 6 includes a pair of straight side frames 6A extending in the front-rear direction directly below the pair of front side members 1, and a rear side between the rear ends of the side frames 6A. It is formed in a planar U-shape with a frame provided integrally, or in the form of a plane well with a front frame integrally provided between front end portions of the side frame 6A.

サブフレーム６は、その後端部をフロントサイドメンバ１のエクステンション部１Ｃの下面に直接重合してボルト７により締結固定する一方、前端部をフロントサイドメンバ１のフロント部１Ａの前端部下面に接合配置したブラケット８の下面に重合してボルト９により締結固定してある。   The subframe 6 has a rear end portion which is directly overlapped with a lower surface of the extension portion 1C of the front side member 1 and fastened and fixed by a bolt 7, while a front end portion is joined to the lower surface of the front end portion 1A of the front side member 1. It is superposed on the lower surface of the bracket 8 and fastened and fixed with bolts 9.

駆動ユニット５は、基本的には前記一対のフロントサイドメンバ１のフロント部１Ａに跨って、該フロント部１Ａが軸方向に圧潰変形すると離脱し得るようにマウント部材を介して搭載支持されていて、前記サブフレーム６には、駆動ユニット５の下部を側部フレーム６Ａの前後方向中間部分にマウント部材１０を介して支持してある。   The drive unit 5 is basically mounted and supported via a mount member over the front part 1A of the pair of front side members 1 so that it can be detached when the front part 1A is deformed in the axial direction. The lower portion of the drive unit 5 is supported on the sub-frame 6 via the mount member 10 at the intermediate portion in the front-rear direction of the side frame 6A.

一方、前記ブラケット８は、下面にサブフレーム６の前端部、具体的には側部フレーム６Ａの前端部を重合して前記ボルト９により締結固定する底壁８Ａと、該底壁８Ａの前，後縁部から立設されて上端を前記フロント部１Ａの前端部下面に結合した前壁８Ｂおよび後壁８Ｃと、この前壁８Ｂの上端部と、前記底壁８Ａと後壁８Ｃとの連設隅部とに跨って前傾状態に設けた斜壁８Ｄと、を備えている。   On the other hand, the bracket 8 includes a bottom wall 8A that overlaps a front end portion of the sub-frame 6 on the lower surface, specifically, a front end portion of the side frame 6A, and is fastened and fixed by the bolt 9, and a front wall of the bottom wall 8A, A front wall 8B and a rear wall 8C which are erected from the rear edge and have an upper end coupled to a lower surface of the front end of the front portion 1A, an upper end of the front wall 8B, and a connection between the bottom wall 8A and the rear wall 8C. And an inclined wall 8D provided in a forward inclined state across the installation corner.

そして、前記ブラケット８の前壁８Ｂを、底壁８Ａ，後壁８Ｃ，および斜壁８Ｄよりもパネル剛性を低く設定し、該ブラケット８が上下方向に圧縮荷重を受けると、該前壁８Ｂがいち早く座屈変形し得るようにしてある。   When the front wall 8B of the bracket 8 is set to have a panel rigidity lower than that of the bottom wall 8A, the rear wall 8C, and the oblique wall 8D, and the bracket 8 receives a compressive load in the vertical direction, the front wall 8B It can be quickly buckled and deformed.

これは、例えば前壁８Ｂの板厚を、底壁８Ａ，後壁８Ｃ，斜壁８Ｄの板厚よりも薄くしたり、あるいは、材質を変えることによって容易に調整することができる。   This can be easily adjusted, for example, by making the thickness of the front wall 8B thinner than the thickness of the bottom wall 8A, the rear wall 8C, and the inclined wall 8D, or by changing the material.

本実施形態ではブラケット８を図４に示すように、左右の側壁８Ｅを一体に設けたボックス構造として、前壁８Ｂ，後壁８Ｃ，側壁８Ｅの各上端に延設したフランジ部８Ｂａ，８Ｃａ，８Ｅａを介してフロント部１Ａにミグ溶接等により接合してあるが、この側壁８Ｅも前壁８Ｂと同様に他の壁部８Ａ，８Ｃ，８Ｄよりもパネル剛性を低く設定して、前記圧縮荷重に対して前壁８Ｂと共にいち早く座屈変形し得るようにしてある。   In the present embodiment, as shown in FIG. 4, the bracket 8 has a box structure in which left and right side walls 8E are integrally provided, and flange portions 8Ba, 8Ca, extending from the upper ends of the front wall 8B, the rear wall 8C, and the side wall 8E, 8Ea is joined to the front portion 1A by MIG welding or the like, but the side wall 8E is also set to have a panel rigidity lower than that of the other wall portions 8A, 8C, 8D in the same manner as the front wall 8B. On the other hand, it can be quickly buckled together with the front wall 8B.

また、前記フロント部１Ａの前端部、具体的にはブラケット８の前方下面には、ほぼ水平な先端部１１ａがブラケット８の前壁８Ｂに近接配置されて、車両の前面衝突時にフロント部１Ａの軸方向の圧潰変形に伴って後退して、前記ブラケット８の前壁８Ｂに衝接する変形促進用の突起部１１を固設してある。   Further, a substantially horizontal front end portion 11a is disposed close to the front wall 8B of the bracket 8 at the front end portion of the front portion 1A, specifically, the front lower surface of the bracket 8, so that the front portion 1A can be A projection 11 for promoting deformation that is retracted along with axial crushing deformation and abuts against the front wall 8B of the bracket 8 is fixed.

以上の構成によりこの実施形態の車体前部構造によれば、車両の前面衝突によりフロントサイドメンバ１の前端部に衝突荷重Ｆが入力すると、図２，図５に示すようにバンパーステイ４が軸方向に圧潰変形すると共に、フロントサイドメンバ１のフロント部１Ａも前端側から軸方向に圧潰変形（軸圧潰）する。   According to the vehicle body front structure of this embodiment having the above configuration, when a collision load F is input to the front end of the front side member 1 due to a frontal collision of the vehicle, the bumper stay 4 is pivoted as shown in FIGS. The front portion 1A of the front side member 1 is also deformed in the axial direction from the front end side (axial collapse).

このフロント部１Ａの前端部の軸圧潰の進行により、駆動ユニット５がフロント部１Ａのマウント部分で離脱する一方、サブフレーム６の側部フレーム６Ａには、その前，後端部の締結固定部を支点にして図３，図６に示すように前後方向に圧縮荷重Ｆａが発生して、該側部フレーム６Ａがマウント部材１０による駆動ユニット５の支持点を頂点として側面くの字状に下向きに折れ曲がり変形する。   Due to the progress of axial crushing at the front end portion of the front portion 1A, the drive unit 5 is detached at the mounting portion of the front portion 1A, while the side frame 6A of the subframe 6 is fastened to the front and rear end fastening portions. As shown in FIGS. 3 and 6, a compressive load Fa is generated in the front-rear direction as shown in FIGS. 3 and 6, and the side frame 6A is downward in the shape of a side face with the support point of the drive unit 5 by the mount member 10 as the apex. It bends and deforms.

このくの字状の折れ曲がり変形により、側部フレーム６Ａの前，後端部の締結固定部分には上向きの反力Ｆｂが発生するが、後端部はフロントサイドメンバ１のエクステンション部１Ｃの下面に重合して締結固定してあるため、該後端部の上方移動が抑えられる一方、前端部はブラケット８に前記上向きの反力Ｆｂが上下方向の圧縮荷重として作用し、該ブラケット８が上下方向に圧縮変形する。   Due to this dogleg-shaped bending deformation, an upward reaction force Fb is generated at the fastening and fixing portions of the front and rear ends of the side frame 6A, but the rear end is the lower surface of the extension portion 1C of the front side member 1. Since the rear end portion is restrained from moving upward, the upward reaction force Fb acts on the bracket 8 as a compressive load in the vertical direction, and the bracket 8 moves up and down. Compressive deformation in the direction.

このとき、ブラケット８の前壁８Ｂは、底壁８Ａ，後壁８Ｃ，および斜壁８Ｄよりもパネル剛性を低く設定してあるため、前記上向きの反力Ｆｂによって前壁８Ｂが側壁８Ｅと共にいち早く座屈変形する。   At this time, the front wall 8B of the bracket 8 is set to have a panel rigidity lower than that of the bottom wall 8A, the rear wall 8C, and the oblique wall 8D. Therefore, the front wall 8B is quickly brought together with the side wall 8E by the upward reaction force Fb. Buckling deformation.

これにより、後壁８Ｃと斜壁８Ｄとによる三角トラス構造によって、これら後壁８Ｃと斜壁８Ｄが支壁となってそれらの連設隅部を支点Ｐとして側部フレーム６Ａの前端部が支持されると共に、ブラケット８の底壁８Ａがその後端の前記支点Ｐを中心に側部フレーム６Ａの前端部と一体的に上向きに折れ曲がり変形し、該底壁８Ａと側部フレーム６Ａの前端部との締結固定点であるボルト９に剪断荷重が作用するのを回避してボルト９による締結状態を維持することができる。   Thereby, by the triangular truss structure by the rear wall 8C and the inclined wall 8D, the rear wall 8C and the inclined wall 8D serve as a supporting wall, and the front end portion of the side frame 6A is supported with the connecting corner as a fulcrum P. At the same time, the bottom wall 8A of the bracket 8 is bent upward and integrally with the front end of the side frame 6A around the fulcrum P at the rear end, and the bottom wall 8A and the front end of the side frame 6A It is possible to avoid a shear load from acting on the bolt 9 that is the fastening fixing point of the bolt 9 and maintain the fastening state by the bolt 9.

ここで、特に本実施形態では、図２，図５に示す衝突初期の段階で、フロント部１Ａの前端が軸圧潰を始めると、突起部１１の先端１１ａがブラケット８の前壁８Ｂに衝接して該前壁８Ｂに直接的に衝突入力Ｆを作用させるため、該前壁８Ｂの座屈変形を速進してボルト９への剪断荷重の発生をより確実に回避させることができる。   Here, particularly in the present embodiment, when the front end of the front portion 1A starts axial crushing at the initial stage of the collision shown in FIGS. 2 and 5, the tip 11a of the protrusion 11 comes into contact with the front wall 8B of the bracket 8. Thus, since the collision input F acts directly on the front wall 8B, the buckling deformation of the front wall 8B can be accelerated and the generation of the shear load on the bolt 9 can be avoided more reliably.

この結果、前記フロント部１Ａの前端部がブラケット８から脱落するのを防止して、サブフレーム６の側部フレーム６Ａのくの字状の折れ曲がり変形を適正に行わせて衝突エネルギーの吸収効果を発揮させることができると共に、駆動ユニット５を下方に引き落して該駆動ユニット５がダッシュパネル２に干渉して、該ダッシュパネル２が変形するのを回避することができる。   As a result, the front end portion of the front portion 1A is prevented from falling off from the bracket 8, and the side frame 6A of the subframe 6 is appropriately bent and deformed in the shape of a letter to thereby absorb the collision energy. In addition to being able to exert this effect, it is possible to prevent the dash panel 2 from being deformed by pulling the drive unit 5 downward and causing the drive unit 5 to interfere with the dash panel 2.

ところで、本発明の車体前部構造を、前記実施形態に例をとって説明したが、この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で他の実施形態を各種採ることができる。   By the way, although the vehicle body front part structure of the present invention has been described by taking the above embodiment as an example, the present invention is not limited to this embodiment, and various other embodiments can be adopted without departing from the gist of the present invention.

本発明の一実施形態を示す側面図。The side view which shows one Embodiment of this invention. 衝突初期における車体前部の変形状態を示す図１と同様の側面図。The side view similar to FIG. 1 which shows the deformation | transformation state of the vehicle body front part in the collision initial stage. 衝突による車体前部の変形が進行した状態を示す図１と同様の側面図。The side view similar to FIG. 1 which shows the state which the deformation | transformation of the vehicle body front part by the collision advanced. 図１におけるブラケットの取付け状態を示す下方から見た斜視図。The perspective view seen from the lower part which shows the attachment state of the bracket in FIG. 図２におけるサブフレーム前端部の連結部分を示す側面図。The side view which shows the connection part of the sub-frame front-end part in FIG. 図３におけるサブフレーム前端部の連結部分を示す側面図である。It is a side view which shows the connection part of the sub-frame front-end part in FIG.

符号の説明Explanation of symbols

１…フロントサイドメンバ
５…駆動ユニット
６…サブフレーム
６Ａ…側部フレーム
８…ブラケット
８Ａ…底壁
８Ｂ…前壁
８Ｃ…後壁
８Ｄ…斜壁
１１…突起部
Ｆ・Ｃ…フロントコンパートメント DESCRIPTION OF SYMBOLS 1 ... Front side member 5 ... Drive unit 6 ... Sub-frame 6A ... Side part frame 8 ... Bracket 8A ... Bottom wall 8B ... Front wall 8C ... Rear wall 8D ... Oblique wall 11 ... Projection part FC ... Front compartment

Claims (1)

車体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１対のフロントサイドメンバと、
前記１対のフロントサイドメンバよりも下方でほぼ水平に配置されて、後端部を各フロントサイドメンバの後端部下面に締結固定すると共に、前端部を各フロントサイドメンバの前端部下面に接合配置したブラケットに締結固定して、前後方向中間部分に駆動ユニットの支持点を設定したサブフレームと、を備えた車体前部構造であって、
前記ブラケットは、少なくとも下面にサブフレームの前端部を締結固定する底壁と、
該底壁の前，後縁部から立設されて上端をフロントサイドメンバの前端部下面に結合した前壁および後壁と、
前壁の上端部と、底壁と後壁との連設隅部とに跨って前傾状態に設けた斜壁と、を備え、
前記フロントサイドメンバの前端部に、車両の前面衝突時に該フロントサイドメンバの軸方向の圧潰変形に伴って後退して、前記ブラケットの前壁に衝接する変形促進用の突起部を設けたことを特徴とする車体前部構造。 A pair of front side members that extend in the vehicle longitudinal direction on both sides of the front compartment of the vehicle body in the vehicle width direction;
Located substantially horizontally below the pair of front side members, the rear end portion is fastened and fixed to the lower surface of the rear end portion of each front side member, and the front end portion is joined to the lower surface of the front end portion of each front side member. A vehicle body front structure comprising: a subframe that is fastened and fixed to the disposed bracket, and a support point of the drive unit is set at an intermediate portion in the front-rear direction;
The bracket includes at least a bottom wall for fastening and fixing the front end of the subframe to the lower surface;
A front wall and a rear wall that are erected from the front and rear edges of the bottom wall and have upper ends coupled to the lower surface of the front end of the front side member;
An inclined wall provided in a forward inclined state straddling the upper end of the front wall and the connecting corner of the bottom wall and the rear wall,
The front end of the front side member is provided with a deformation-promoting protrusion that retreats along with the axial deformation of the front side member during a frontal collision of the vehicle and abuts against the front wall of the bracket. Car body front structure.
JP2004029276A 2004-02-05 2004-02-05 Body front structure Expired - Fee Related JP3873979B2 (en)

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