JP2018122766A - Vehicle front structure - Google Patents
Vehicle front structure Download PDFInfo
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- JP2018122766A JP2018122766A JP2017017504A JP2017017504A JP2018122766A JP 2018122766 A JP2018122766 A JP 2018122766A JP 2017017504 A JP2017017504 A JP 2017017504A JP 2017017504 A JP2017017504 A JP 2017017504A JP 2018122766 A JP2018122766 A JP 2018122766A
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- 238000005452 bending Methods 0.000 claims abstract description 27
- 239000000725 suspension Substances 0.000 claims abstract description 21
- 239000011324 bead Substances 0.000 description 4
- 230000004888 barrier function Effects 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
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Abstract
Description
本発明は、車両前部構造に関する。 The present invention relates to a vehicle front structure.
下記特許文献１には、センタクロスメンバ（サスペンションメンバ）の車両前方側に配置されるサイドメンバを備え、サイドメンバが車両幅方向の内方側に傾斜しつつ車両前後方向の後方側に延びた構造が開示されている。なお、サイドメンバに車両幅方向外側へ突出する突出部材を設け、微小ラップ衝突時に車両に対して横力を発生させる構造として、特許文献２に記載されたものがある。 The following Patent Document 1 includes a side member disposed on the vehicle front side of a center cross member (suspension member), and the side member extends rearward in the vehicle front-rear direction while inclining inward in the vehicle width direction. A structure is disclosed. In addition, there exists a thing described in patent document 2 as a structure which provides the side member with the protrusion member which protrudes to the vehicle width direction outer side, and generates a lateral force with respect to a vehicle at the time of a micro lap collision.
上記特許文献１に記載の構造では、車両の衝突時にサイドメンバの前方部が変形することにより、衝突荷重の吸収部として機能するように構成している。しかし、特許文献１に記載の構造では、微小ラップ衝突時にサイドメンバにより車両に対して横力を加える構造については記載されておらず、改善の余地がある。 The structure described in Patent Document 1 is configured to function as a collision load absorbing portion by deforming the front portion of the side member at the time of a vehicle collision. However, the structure described in Patent Document 1 does not describe a structure in which a lateral force is applied to the vehicle by a side member at the time of a minute lap collision, and there is room for improvement.
本発明は上記事実を考慮し、車両の前面オフセット衝突時に、車両に横力を発生させ、車両を衝突物から回避する方向に移動させることができる車両前部構造を得ることが目的である。 In view of the above facts, an object of the present invention is to obtain a vehicle front structure capable of generating a lateral force in a vehicle and moving the vehicle in a direction to avoid the collision object at the time of a front offset collision of the vehicle.
請求項１の発明に係る車両前部構造は、サスペンションメンバと、前記サスペンションメンバから車両前後方向の前方側に延在され、車両平面視にて車両前後方向の前端部に車両後方側から前記前端部側に向かって車両幅方向の外方側に傾斜する湾曲部を備えたサイドメンバと、前記サイドメンバの前記前端部における車体側の締結部の後方に形成され、車両側面視にて前記前端部が車両のドライブトレインと高さ方向でラップする位置に配置されると共に、車両後方側から前記前端部側に向かって車両上方側に湾曲し、前記前端部を車両上下方向の上方向に座屈させる曲げ起点部と、を有する。 According to a first aspect of the present invention, a vehicle front portion structure extends from the suspension member to the front side in the vehicle front-rear direction from the suspension member, and extends from the vehicle rear side to the front end portion in the vehicle front-rear direction in a vehicle plan view. A side member having a curved portion that inclines outward in the vehicle width direction toward the vehicle side, and a rear side of a fastening portion on the vehicle body side at the front end portion of the side member, and the front end in a side view of the vehicle Is disposed at a position that wraps in the height direction with the drive train of the vehicle, curves from the vehicle rear side toward the front end portion toward the vehicle upper side, and seats the front end portion upward in the vehicle vertical direction. A bending start point portion to be bent.
請求項１記載の本発明によれば、サスペンションメンバから車両前後方向の前方側にサイドメンバが延在されている。サイドメンバの車両前後方向の前端部には、車両後方側から前端部側に向かって車両幅方向の外方側に傾斜する湾曲部が設けられている。また、サイドメンバの前端部における車体側の締結部の後方には、車両側面視にて車両後方側から前端部側に向かって車両上方側に湾曲し、前端部を車両上下方向の上方向に座屈させる曲げ起点部が形成されている。さらに、車両側面視にてサイドメンバの前端部が車両のドライブトレインと高さ方向でラップする位置に配置されている。これにより、車両の前面オフセット衝突時（例えば、オブリーク衝突時又は微小ラップ衝突時）に、サイドメンバの前端部が湾曲部により車両幅方向の内方側に座屈すると共に、サイドメンバの前端部が曲げ起点部により車両上下方向の上方向に座屈する。このため、サイドメンバの前端部の座屈した部分がドライブトレインと接触する。これによって、車両に横力を発生させることができ、車両を衝突物から回避する方向に移動させることができる。 According to the first aspect of the present invention, the side member extends from the suspension member to the front side in the vehicle front-rear direction. A curved portion that inclines outward in the vehicle width direction from the vehicle rear side toward the front end portion side is provided at the front end portion of the side member in the vehicle front-rear direction. Further, behind the fastening portion on the vehicle body side at the front end portion of the side member, the vehicle is bent upward from the vehicle rear side toward the front end portion in a side view of the vehicle, and the front end portion is directed upward in the vehicle vertical direction. A bending start point for buckling is formed. Furthermore, the front end portion of the side member is disposed at a position where it wraps in the height direction with the drive train of the vehicle in a side view of the vehicle. As a result, the front end of the side member is buckled inward in the vehicle width direction by the curved portion at the time of a front offset collision of the vehicle (for example, at the time of an oblique collision or a minute lap collision), and the front end of the side member is It buckles upward in the vehicle vertical direction by the bending start point. For this reason, the buckled portion of the front end portion of the side member comes into contact with the drive train. Thereby, a lateral force can be generated in the vehicle, and the vehicle can be moved in a direction avoiding the collision object.
本発明に係る車両前部構造によれば、車両の前面オフセット衝突時に、車両に横力を発生させ、車両を衝突物から回避する方向に移動させることができる。 According to the vehicle front structure according to the present invention, a lateral force can be generated in the vehicle at the time of a front offset collision of the vehicle, and the vehicle can be moved in a direction to avoid the collision object.
以下、図１〜図５を用いて、本発明に係る車両前部構造の一実施形態について説明する。なお、これらの図において適宜示される矢印ＦＲは車両前方側を示しており、矢印ＵＰは車両上方側を示しており、矢印ＯＵＴは車両幅方向外側を示している。また、図において適宜示されるＤＮは、車両上下方向の下側を示している。 Hereinafter, an embodiment of a vehicle front structure according to the present invention will be described with reference to FIGS. In these drawings, an arrow FR appropriately shown indicates the vehicle front side, an arrow UP indicates the vehicle upper side, and an arrow OUT indicates the vehicle width direction outer side. Further, DN appropriately shown in the figure indicates the lower side of the vehicle vertical direction.
図１には、本実施形態に係る車両前部構造１８が適用された車両１０の前部１１が側面図にて示されており、図２には、車両前部構造１８が適用された車両１０の前部１１が拡大された状態で側面図にて示されている。図３には、車両前部構造１８が適用された車両１０の前部１１が平面図にて示されており、図４には、車両前部構造１８が適用された車両１０の前部１１の車両幅方向の一方側（車両背面視にて車両幅方向左側）が拡大された状態で平面図にて示されている。図１〜図４に示されるように、自動車の車両１０の前部１１の幅方向外側には、略車両前後方向に沿って延在されるフロントサイドメンバ１２が設けられている。フロントサイドメンバ１２は、車両骨格部材を構成している。フロントサイドメンバ１２の前端部の車両前方側には、クラッシュボックス１４が設けられている（図１及び図２参照）。クラッシュボックス１４は、フロントサイドメンバ１２の前部１２Ａの車両前方に配置された板状の取付部１３を介して締結具（図示省略）等により取り付けられている。 FIG. 1 is a side view showing a front portion 11 of a vehicle 10 to which a vehicle front structure 18 according to this embodiment is applied. FIG. 2 shows a vehicle to which a vehicle front structure 18 is applied. 10 is shown in a side view with the front part 11 enlarged. FIG. 3 is a plan view showing the front portion 11 of the vehicle 10 to which the vehicle front structure 18 is applied, and FIG. 4 shows the front portion 11 of the vehicle 10 to which the vehicle front structure 18 is applied. Is shown in a plan view in an enlarged state on one side in the vehicle width direction (left side in the vehicle width direction when viewed from the back of the vehicle). As shown in FIGS. 1 to 4, a front side member 12 extending substantially along the vehicle front-rear direction is provided on the outer side in the width direction of the front portion 11 of the vehicle 10 of the automobile. The front side member 12 constitutes a vehicle skeleton member. A crash box 14 is provided on the front side of the front end of the front side member 12 (see FIGS. 1 and 2). The crash box 14 is attached by a fastener (not shown) or the like via a plate-like attachment portion 13 disposed in front of the vehicle of the front portion 12A of the front side member 12.
フロントサイドメンバ１２及びクラッシュボックス１４は、車両１０の幅方向両端部に左右一対で配置されている（図３参照）。クラッシュボックス１４は、略車両前後方向に配置された筒状部を備えており、衝突荷重の入力時に軸方向に圧縮変形することによって衝突エネルギーを吸収するようになっている。車両１０の幅方向両側のクラッシュボックス１４の車両前方側には、略車両幅方向に沿って延在されるフロントバンパリインフォース１６が取り付けられている（図３参照）。フロントバンパリインフォース１６は、車両幅方向中央部が車両幅方向両端部よりも車両前方側に突出するように湾曲して形成されている。 The front side member 12 and the crash box 14 are arranged in a pair of left and right at both ends in the width direction of the vehicle 10 (see FIG. 3). The crash box 14 includes a cylindrical portion disposed substantially in the vehicle front-rear direction, and absorbs collision energy by compressing and deforming in the axial direction when a collision load is input. Front bumper reinforcements 16 extending substantially along the vehicle width direction are attached to the vehicle front side of the crash boxes 14 on both sides in the width direction of the vehicle 10 (see FIG. 3). The front bumper reinforcement 16 is formed to be curved so that the center in the vehicle width direction protrudes toward the vehicle front side from both ends in the vehicle width direction.
フロントサイドメンバ１２の後部１２Ｂは、車両上下方向の下方側に傾斜しつつ車両前後方向の後方側に延びている（図１及び図２参照）。フロントサイドメンバ１２の後部１２Ｂの後端下部には、サスペンションメンバ２０が取り付けられている。サスペンションメンバ２０は、車両幅方向に沿って配置されており、左右一対のフロントサイドメンバ１２を繋ぐ構成とされている（図３参照）。サスペンションメンバ２０は、車両平面視にて左右対称に形成されている。サスペンションメンバ２０は、フロントサイドメンバ１２の後部１２Ｂの後端下部から車両前方側に略水平方向に延びている（図１及び図２参照）。サスペンションメンバ２０には、サスペンションメンバ２０から略車両前後方向の前方側に延在されるサイドメンバとしての第二メンバ２２が設けられている。第二メンバ２２は、車両幅方向外側に左右一対で配置されており、左右一対の第二メンバ２２は、車両平面視にて左右対称に形成されている（図３参照）。車両平面視にて第二メンバ２２は、それぞれフロントサイドメンバ１２の車両上下方向の下方側に配置されている。 The rear portion 12B of the front side member 12 extends rearward in the vehicle front-rear direction while inclining downward in the vehicle vertical direction (see FIGS. 1 and 2). A suspension member 20 is attached to the rear lower portion of the rear portion 12B of the front side member 12. The suspension member 20 is disposed along the vehicle width direction, and is configured to connect the pair of left and right front side members 12 (see FIG. 3). The suspension member 20 is formed symmetrically in the vehicle plan view. The suspension member 20 extends in a substantially horizontal direction from the lower rear end of the rear portion 12B of the front side member 12 to the front side of the vehicle (see FIGS. 1 and 2). The suspension member 20 is provided with a second member 22 as a side member that extends from the suspension member 20 to the front side in the vehicle longitudinal direction. The pair of left and right members 22 are disposed on the outer side in the vehicle width direction, and the pair of left and right second members 22 are formed symmetrically in plan view of the vehicle (see FIG. 3). The second members 22 are respectively arranged on the lower side of the front side member 12 in the vehicle vertical direction in the vehicle plan view.
図３及び図４に示されるように、第二メンバ２２は、車両前後方向の前端部２２Ａから車両幅方向の内方側に傾斜しつつ車両前後方向の後方側に延びており、第二メンバ２２の後端部２２Ｂは、サスペンションメンバ２０の前部側に接合されている。第二メンバ２２の前端部２２Ａの構成については、後述する。 As shown in FIGS. 3 and 4, the second member 22 extends from the front end portion 22A in the vehicle front-rear direction to the rear side in the vehicle front-rear direction while inclining inward in the vehicle width direction. The rear end 22 </ b> B of 22 is joined to the front side of the suspension member 20. The configuration of the front end portion 22A of the second member 22 will be described later.
図１及び図２に示されるように、サスペンションメンバ２０の前部には、車両上方側に突出する突出部２８が設けられており、突出部２８がフロントサイドメンバ１２の下側取付部１２Ｃに図示しない締結具により固定されている。 As shown in FIGS. 1 and 2, the suspension member 20 is provided at the front portion with a protruding portion 28 that protrudes toward the upper side of the vehicle, and the protruding portion 28 is attached to the lower mounting portion 12 </ b> C of the front side member 12. It is fixed by a fastener (not shown).
また、第二メンバ２２の前端部２２Ａには、略車両前後方向に延びたロアクラッシュボックス３０が設けられている。ロアクラッシュボックス３０は、第二メンバ２２の前端部２２Ａの車両前方に配置された板状の取付部３４を介して締結具（図示省略）等により取り付けられている。ロアクラッシュボックス３０の前部には、略車両幅方向に沿って延在される連結部材３２が設けられている。すなわち、連結部材３２は、左右一対のロアクラッシュボックス３０に架け渡されている。ロアクラッシュボックス３０は、略車両前後方向に配置された筒状部を備えており、衝突荷重の入力時に軸方向に圧縮変形することによって衝突エネルギーを吸収するようになっている。 Further, a lower crash box 30 that extends substantially in the vehicle front-rear direction is provided at the front end 22A of the second member 22. The lower crash box 30 is attached by a fastener (not shown) or the like via a plate-like attachment portion 34 disposed in front of the front end portion 22A of the second member 22. A connecting member 32 extending substantially along the vehicle width direction is provided at the front portion of the lower crash box 30. That is, the connecting member 32 is spanned between a pair of left and right lower crash boxes 30. The lower crash box 30 includes a cylindrical portion disposed substantially in the vehicle front-rear direction, and absorbs collision energy by compressing and deforming in the axial direction when a collision load is input.
第二メンバ２２の前端部２２Ａの取付部３４には、車両上方側に延びた締結部としての前側取付部３６が設けられている。前側取付部３６の上部は、フロントサイドメンバ１２の前部１２Ａの先端部に図示しない締結具により固定されている。なお、フロントサイドメンバ１２の前部１２Ａは、本発明の「車体側」の部材の一例である。また、サスペンションメンバ２０には、ロアアーム４６を介してフロントタイヤ４８が回転自在に支持されている（図３及び図４参照）。 A mounting portion 34 of the front end portion 22A of the second member 22 is provided with a front mounting portion 36 as a fastening portion extending to the vehicle upper side. The upper part of the front attachment portion 36 is fixed to the front end portion of the front portion 12A of the front side member 12 by a fastener (not shown). The front portion 12A of the front side member 12 is an example of the “vehicle body side” member of the present invention. Further, a front tire 48 is rotatably supported on the suspension member 20 via a lower arm 46 (see FIGS. 3 and 4).
図３及び図４に示されるように、車両１０の前部１１には、左右一対のフロントサイドメンバ１２の車両幅方向の内側に、車両１０を駆動するドライブトレイン（「パワーユニット」という場合がある）２６が配置されている。車両平面視にて第二メンバ２２の前端部２２Ａには、車両前後方向の後方側から前端部２２Ａ側に向かって車両幅方向の外方側に傾斜する湾曲部４０が設けられている。すなわち、第二メンバ２２の湾曲部４０の後方側は車両幅方向内側に配置されており、第二メンバ２２の湾曲部４０の前方側は車両幅方向外側に配置されている。本実施形態では、車両平面視にて第二メンバ２２の後方側は、略車両前後方向に沿って延びており、湾曲部４０（特に第二メンバ２２の車両外側の壁部）は、第二メンバ２２の後方側から前端部２２Ａ側に向かって車両幅方向の外方側に屈曲させた構成とされている。 As shown in FIG. 3 and FIG. 4, the front portion 11 of the vehicle 10 has a drive train (a “power unit”) that drives the vehicle 10 inside the vehicle width direction of the pair of left and right front side members 12. ) 26 is arranged. The front end portion 22A of the second member 22 is provided with a curved portion 40 that inclines outward in the vehicle width direction from the rear side in the vehicle front-rear direction toward the front end portion 22A in the vehicle plan view. That is, the rear side of the curved portion 40 of the second member 22 is disposed on the inner side in the vehicle width direction, and the front side of the curved portion 40 of the second member 22 is disposed on the outer side in the vehicle width direction. In the present embodiment, the rear side of the second member 22 in the vehicle plan view extends substantially along the vehicle front-rear direction, and the curved portion 40 (particularly the vehicle outer wall portion of the second member 22) The member 22 is bent outward from the rear side of the member 22 toward the front end 22A.
湾曲部４０は、第二メンバ２２の前側をフロントサイドメンバ１２の前部１２Ａに固定する前側取付部３６の後方に設けられている。第二メンバ２２の前端部２２Ａに湾曲部４０を設けることで、車両１０の前面オフセット衝突時（例えば、オブリーク衝突時又は微小ラップ衝突時）に、第二メンバ２２の前端部２２Ａが、湾曲部４０を起点（きっかけ）として車両幅方向内側に座屈するようになっている。 The bending portion 40 is provided behind the front attachment portion 36 that fixes the front side of the second member 22 to the front portion 12 </ b> A of the front side member 12. By providing the bending portion 40 at the front end portion 22A of the second member 22, the front end portion 22A of the second member 22 is bent at the front offset collision of the vehicle 10 (for example, at the time of oblique collision or minute lap collision). 40 starts from the starting point (trigger) and buckles inward in the vehicle width direction.
図１及び図２に示されるように、車両側面視にて第二メンバ２２の前端部２２Ａにおける前側取付部３６の後方には、車両前後方向の後方側から前端部２２Ａ側に向かって車両上方側に湾曲し（立上がり）、前端部２２Ａを車両上下方向の上方向に座屈させる曲げ起点部４２が設けられている。すなわち、第二メンバ２２の曲げ起点部４２の後方側は車両上下方向の下側に配置されており、第二メンバ２２の曲げ起点部４２の前方側は車両上下方向の上側に配置されている。本実施形態では、車両側面視にて第二メンバ２２の後方側は、略車両前後方向に沿って延びており、曲げ起点部４２は、第二メンバ２２の後方側から前端部２２Ａ側に向かって車両上下方向の上方側に傾斜するように屈曲させた構成とされている。 As shown in FIG. 1 and FIG. 2, in the vehicle side view, behind the front mounting portion 36 in the front end portion 22 </ b> A of the second member 22, the vehicle upper direction from the rear side in the vehicle front-rear direction toward the front end portion 22 </ b> A side. A bending starting point portion 42 that is curved to the side (rises) and buckles the front end portion 22A upward in the vehicle vertical direction is provided. That is, the rear side of the bending start point portion 42 of the second member 22 is disposed below the vehicle vertical direction, and the front side of the bending start point portion 42 of the second member 22 is disposed above the vehicle vertical direction. . In the present embodiment, the rear side of the second member 22 in the vehicle side view extends substantially along the vehicle front-rear direction, and the bending start portion 42 is directed from the rear side of the second member 22 toward the front end portion 22A. Thus, the vehicle is bent so as to incline upward in the vertical direction of the vehicle.
さらに、車両側面視にて第二メンバ２２の前端部２２Ａ（曲げ起点部４２の前側）は、ドライブトレイン２６と高さ方向でラップする（重なる）位置に配置されている（図１及び図２参照）。また、本実施形態では、車両平面視にて第二メンバ２２の前端部２２Ａは、ドライブトレイン２６と上下方向に重なっておらず、第二メンバ２２の前端部２２Ａの車両幅方向の内方側でドライブトレイン２６と重なるように配置されている（図３及び図４参照）。 Furthermore, the front end portion 22A of the second member 22 (the front side of the bending start portion 42) is disposed at a position that overlaps (overlaps) with the drive train 26 in the height direction when viewed from the side of the vehicle (FIGS. 1 and 2). reference). Further, in the present embodiment, the front end portion 22A of the second member 22 does not overlap the drive train 26 in the vertical direction in the vehicle plan view, and the vehicle width direction inward side of the front end portion 22A of the second member 22 Thus, they are arranged so as to overlap the drive train 26 (see FIGS. 3 and 4).
第二メンバ２２の前端部２２Ａに曲げ起点部４２を設けることで、車両１０の前面オフセット衝突時（例えば、オブリーク衝突時又は微小ラップ衝突時）に、曲げ起点部４２を起点（きっかけ）として、第二メンバ２２の前端部２２Ａを車両上下方向の上方側に座屈させるようになっている。本実施形態では、第二メンバ２２の車両前後方向における前端部２２Ａのほぼ同じ位置に、湾曲部４０と曲げ起点部４２が設けられている。これにより、車両１０の前面オフセット衝突時に、第二メンバ２２の前端部２２Ａが、湾曲部４０と曲げ起点部４２により、車両幅方向内側に座屈すると共に車両上下方向の上方側に座屈するようになっている。 By providing the bending start point portion 42 at the front end portion 22A of the second member 22, the bending start point portion 42 is set as a starting point (trigger) at the time of a front offset collision of the vehicle 10 (for example, at the time of an oblique collision or a minute lap collision). The front end 22A of the second member 22 is buckled upward in the vehicle vertical direction. In the present embodiment, the bending portion 40 and the bending start point portion 42 are provided at substantially the same position of the front end portion 22A of the second member 22 in the vehicle longitudinal direction. Thereby, at the time of a front offset collision of the vehicle 10, the front end portion 22 </ b> A of the second member 22 is buckled inward in the vehicle width direction and buckled upward in the vehicle vertical direction by the bending portion 40 and the bending start point portion 42. It has become.
次に、本実施形態の作用並びに効果について説明する。 Next, the operation and effect of this embodiment will be described.
車両前部構造１８では、サスペンションメンバ２０から車両前後方向の前方側にサイドメンバとしての第二メンバ２２が延在されている。車両平面視にて、第二メンバ２２の前端部２２Ａには、車両前後方向の後方側から前端部２２Ａ側に向かって車両幅方向の外方側に傾斜する湾曲部４０が設けられている（図３及び図４参照）。また、第二メンバ２２の前端部２２Ａには、フロントサイドメンバ１２に締結する前側取付部３６の後方に、車両側面視にて車両後方側から前端部２２Ａ側に向かって車両上方側に湾曲し、前端部２２Ａを車両上下方向の上方向に座屈させる曲げ起点部４２が形成されている（図１及び図２参照）。さらに、車両側面視にて第二メンバ２２の前端部２２Ａがドライブトレイン２６と高さ方向でラップする位置に配置されている（図１及び図２参照）。 In the vehicle front structure 18, a second member 22 as a side member extends from the suspension member 20 to the front side in the vehicle front-rear direction. In the vehicle plan view, the front end portion 22A of the second member 22 is provided with a curved portion 40 that inclines outward in the vehicle width direction from the rear side in the vehicle front-rear direction toward the front end portion 22A ( 3 and 4). Further, the front end portion 22A of the second member 22 is curved rearwardly of the front side attachment portion 36 fastened to the front side member 12, from the vehicle rear side toward the front end portion 22A side in the vehicle side view, toward the vehicle upper side. A bending starting point portion 42 is formed to buckle the front end portion 22A upward in the vehicle vertical direction (see FIGS. 1 and 2). Furthermore, the front end portion 22A of the second member 22 is disposed at a position where it wraps in the height direction with the drive train 26 in a side view of the vehicle (see FIGS. 1 and 2).
図５には、車両１０の前部１１がバリア５０に前面オフセット衝突したとき（例えば、オブリーク衝突時又は微小ラップ衝突時）のＣＡＥ（Computer Aided Engineering）による解析結果が模式的に示されている。図５に示されるように、車両１０の前部１１がバリア５０と前面オフセット衝突したとき、第二メンバ２２の前端部２２Ａが湾曲部４０により車両幅方向の内方側に座屈すると共に、第二メンバ２２の前端部２２Ａが曲げ起点部４２により車両上下方向の上方向に座屈する。これにより、第二メンバ２２の前端部２２Ａの座屈した部分が、ドライブトレイン２６の側方と接触する。このため、車両１０に横力（車両幅方向で衝突側とは反対側へ向かう反力）を発生させることができ、車両１０をバリア５０から回避する方向に移動させることができる。また、車両１０に横力（車両幅方向で衝突側とは反対側へ向かう反力）を発生させることで、ドライブトレイン２６が配置されるエンジンルーム内でのエネルギー吸収量を増加させることができる。 FIG. 5 schematically shows an analysis result by CAE (Computer Aided Engineering) when the front portion 11 of the vehicle 10 collides with the barrier 50 in a front offset collision (for example, during an oblique collision or a minute lap collision). . As shown in FIG. 5, when the front portion 11 of the vehicle 10 collides with the barrier 50 and the front surface offset, the front end portion 22A of the second member 22 is buckled inward in the vehicle width direction by the curved portion 40, and The front end portion 22A of the two members 22 is buckled upward by the bending start point portion 42 in the vehicle vertical direction. As a result, the buckled portion of the front end 22 </ b> A of the second member 22 contacts the side of the drive train 26. Therefore, a lateral force (a reaction force toward the side opposite to the collision side in the vehicle width direction) can be generated in the vehicle 10, and the vehicle 10 can be moved in a direction avoiding the barrier 50. Further, by generating a lateral force (reaction force toward the side opposite to the collision side in the vehicle width direction) on the vehicle 10, the amount of energy absorbed in the engine room in which the drive train 26 is disposed can be increased. .
また、車両前部構造１８では、フロントサイドメンバ１２のみで衝突性能を担保する構成と比較して、サスペンションメンバ２０から車両前方側に延在される第二メンバ２２を使用することで、効率よく衝突エネルギーを吸収することができる。 Further, in the vehicle front structure 18, the use of the second member 22 that extends from the suspension member 20 to the vehicle front side is more efficient than the configuration that ensures the collision performance with only the front side member 12. The collision energy can be absorbed.
一方、比較例として、サスペンションメンバから車両前方側に延びた第二メンバを直線状に配置した車両前部構造について説明する。比較例の車両前部構造では、ＣＡＥ解析結果によると、車両の前面オフセット衝突時（例えば、オブリーク衝突時又は微小ラップ衝突時）に、第二メンバが座屈せず、第二メンバがドライブトレインと接触しない。このため、第二メンバを利用して車両に横力を発生させることができない。 On the other hand, as a comparative example, a vehicle front structure in which a second member extending from the suspension member to the vehicle front side is arranged in a straight line will be described. In the vehicle front structure of the comparative example, according to the CAE analysis result, the second member does not buckle at the time of front offset collision of the vehicle (for example, at the time of oblique collision or minute lap collision), and the second member is Do not touch. For this reason, a lateral force cannot be generated in the vehicle using the second member.
なお、上記実施形態では、サイドメンバとしての第二メンバ２２の前端部２２Ａに曲げ起点部４２を設けたが、本発明は、この構成に限定されるものではない。例えば、サイドメンバが車両上方側に座屈するような折れ起点（きっかけ）を与えるビード（例えば、車両上方側に凸状に突出するビード）などの折れ起点部や、断面耐力差などを設けた構造としてもよい。 In the above embodiment, the bending start point portion 42 is provided at the front end portion 22A of the second member 22 as the side member. However, the present invention is not limited to this configuration. For example, a structure provided with a fold starting point portion such as a bead (for example, a bead protruding in a convex manner on the vehicle upper side) or a cross-sectional strength difference, etc., which gives a fold starting point (choke) such that the side member buckles to the vehicle upper side. It is good.
また、上記実施形態では、サイドメンバとしての第二メンバ２２の前端部２２Ａに湾曲部４０を設けたが、本発明は、この構成に限定されるものではない。例えば、サイドメンバが車両幅方向内側に座屈するような折れ起点（きっかけ）を与えるビード（例えば、車両幅方向内側に凸状に突出するビード）などの折れ起点部や、断面耐力差などを設けた構造としてもよい。 Moreover, in the said embodiment, although the curved part 40 was provided in 22 A of front-end parts of the 2nd member 22 as a side member, this invention is not limited to this structure. For example, a bending starting point portion such as a bead (for example, a bead protruding in the vehicle width direction in a convex manner) that gives a bending starting point (trigger) such that the side member buckles inward in the vehicle width direction, a cross-sectional strength difference, etc. are provided. It is good also as a structure.
また、上記実施形態では、第二メンバ２２の車両前後方向における前端部２２Ａのほぼ同じ位置に、湾曲部４０と曲げ起点部４２が設けられているが、本発明はこれに限定するものではない。例えば、第二メンバ２２の前端部２２Ａに、車両前後方向に位置をずらして、車両幅方向内側に座屈するような湾曲部などの折れ起点部等と、車両上方側に座屈するような曲げ起点部等とを設けてもよい。 Moreover, in the said embodiment, although the curved part 40 and the bending origin part 42 are provided in the substantially same position of 22 A of front-end parts in the vehicle front-back direction of the 2nd member 22, this invention is not limited to this. . For example, the front end 22A of the second member 22 is shifted in the vehicle front-rear direction and bent starting point such as a curved portion that buckles inward in the vehicle width direction, and a bending start point that buckles upward in the vehicle. And the like may be provided.
さらに、上記実施形態において、第二メンバ２２の前端部２２Ａをフロントサイドメンバ１２に固定する前側取付部３６の構成は、変更が可能である。 Furthermore, in the said embodiment, the structure of the front side attaching part 36 which fixes 22 A of front-end parts of the 2nd member 22 to the front side member 12 can be changed.
１０ 車両
１１ 前部
１２ フロントサイドメンバ（車体側）
１８ 車両前部構造
２０ サスペンションメンバ
２２ 第二メンバ（サイドメンバ）
２２Ａ 前端部
２６ ドライブトレイン
３６ 前側取付部（締結部）
４０ 湾曲部
４２ 曲げ起点部
10 Vehicle 11 Front 12 Front side member (vehicle body side)
18 Vehicle front structure 20 Suspension member 22 Second member (side member)
22A Front end portion 26 Drive train 36 Front side mounting portion (fastening portion)
40 Bending part 42 Bending origin part
Claims (1)
前記サスペンションメンバから車両前後方向の前方側に延在され、車両平面視にて車両前後方向の前端部に車両後方側から前記前端部側に向かって車両幅方向の外方側に傾斜する湾曲部を備えたサイドメンバと、
前記サイドメンバの前記前端部における車体側の締結部の後方に形成され、車両側面視にて前記前端部が車両のドライブトレインと高さ方向でラップする位置に配置されると共に、車両後方側から前記前端部側に向かって車両上方側に湾曲し、前記前端部を車両上下方向の上方向に座屈させる曲げ起点部と、
を有する車両前部構造。 Suspension members,
A curved portion that extends from the suspension member to the front side in the vehicle front-rear direction and inclines toward the front end portion in the vehicle front-rear direction from the vehicle rear side toward the front end portion side in the vehicle width direction in a vehicle plan view. A side member with
It is formed behind the fastening portion on the vehicle body side at the front end portion of the side member, and is arranged at a position where the front end portion wraps in the height direction with the drive train of the vehicle in a side view of the vehicle. A bending starting point portion that curves toward the vehicle upper side toward the front end portion and buckles the front end portion in the vehicle up-down direction;
A vehicle front structure having:
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| JP7419921B2 (en) | 2020-03-26 | 2024-01-23 | 日産自動車株式会社 | Vehicle front suspension device |
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