JP2019025967A - Vehicular body structure - Google Patents

Vehicular body structure Download PDF

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Publication number
JP2019025967A
JP2019025967A JP2017144658A JP2017144658A JP2019025967A JP 2019025967 A JP2019025967 A JP 2019025967A JP 2017144658 A JP2017144658 A JP 2017144658A JP 2017144658 A JP2017144658 A JP 2017144658A JP 2019025967 A JP2019025967 A JP 2019025967A
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vehicle width
vehicle body
body structure
side frame
cross member
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JP6516799B2 (en
Inventor
大貴 早川
Hirotaka Hayakawa
大貴 早川
健 鐘ヶ江
Ken Kanegae
健 鐘ヶ江
陽一郎 濱野
Yoichiro Hamano
陽一郎 濱野
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Honda Motor Co Ltd
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Honda Motor Co Ltd
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Priority to JP2017144658A priority Critical patent/JP6516799B2/en
Priority to CN201810572402.7A priority patent/CN109305229B/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D25/00—Superstructure or monocoque structure sub-units; Parts or details thereof not otherwise provided for
    • B62D25/20—Floors or bottom sub-units

Abstract

To protect a functional component like an IPU when a side collision occurs.SOLUTION: A vehicular body structure 1 includes: a side frame 20 that extends in the back-and-forth direction of a vehicle; a first functional component 10 provided at the internal side of a vehicular widthwise direction of the side frame 20; and a cross member 30 which protrudes downwardly relative to the first functional component 10 from the side frame 20, and which extends in the vehicular widthwise direction. The cross member 30 includes: an extended part 32 that extends outwardly in the vehicular widthwise direction relative to the side frame 20; and a fragile part 33 that is provided inwardly in the vehicular widthwise direction relative to the side frame 20.SELECTED DRAWING: Figure 1

Description

本発明は、フロア下部にＩＰＵ（Ｉｎｔｅｌｌｉｇｅｎｔ Ｐｏｗｅｒ Ｕｎｉｔ）を支持する車体構造に関する。   The present invention relates to a vehicle body structure that supports an IPU (Intelligent Power Unit) at a lower portion of a floor.

特許文献１には、前後方向に延びる左右のフロアフレームの間にＩＰＵを配置することが開示されている。ＩＰＵは、インテリジェントパワーユニット（Ｉｎｔｅｌｌｉｇｅｎｔ Ｐｏｗｅｒ Ｕｎｉｔ）と呼ばれるバッテリーモジュールとパワーコントロールユニットからなる電装部品である。ＩＰＵは、ハイブリッド自動車などにおいてモータとエンジンを効率良く駆動するようにモータに供給する電力をコントロールする。   Patent Document 1 discloses disposing an IPU between left and right floor frames extending in the front-rear direction. The IPU is an electrical component composed of a battery module called an intelligent power unit and an electric power control unit. The IPU controls electric power supplied to the motor so as to efficiently drive the motor and engine in a hybrid vehicle or the like.

特許第５９９７９３３号公報Japanese Patent No. 5997933

図８に示すように、フロアフレームがセンターピラー辺り（図８（ａ）の後方側）で拡幅されている場合は、ＩＰＵとフロアフレームの間の保護領域ｂを十分に確保できる。しかしながら、車種によっては、フロアフレームが拡幅できない場合や、ＩＰＵが大型化した場合など、保護領域ｂが十分に確保できない場合がある。   As shown in FIG. 8, when the floor frame is widened around the center pillar (the rear side of FIG. 8 (a)), the protection area b between the IPU and the floor frame can be sufficiently secured. However, depending on the vehicle type, there may be a case where the protection area b cannot be sufficiently secured, for example, when the floor frame cannot be widened or when the IPU is enlarged.

本発明は、上記課題に鑑みてなされ、その目的は、側面衝突時にＩＰＵなどの機能部品を保護できる車体構造を実現することである。   This invention is made | formed in view of the said subject, The objective is to implement | achieve the vehicle body structure which can protect functional parts, such as IPU, at the time of a side collision.

上記課題を解決し、目的を達成するために、本発明の車体構造１は、車両の前後方向に延びるサイドフレーム２０と、前記サイドフレーム２０の車幅内方側に設けられる第１の機能部品１０と、前記サイドフレーム２０から前記第１の機能部品１０の下方に突出し車幅方向に延びるクロスメンバ３０と、を備え、前記クロスメンバ３０は、前記サイドフレーム２０よりも車幅外方側に延びる延長部３２と、前記サイドフレーム２０よりも車幅内方側に設けられた脆弱部３３とを備えることを特徴とする。   In order to solve the above problems and achieve the object, the vehicle body structure 1 of the present invention includes a side frame 20 extending in the front-rear direction of the vehicle, and a first functional component provided on the vehicle width inward side of the side frame 20. 10 and a cross member 30 projecting from the side frame 20 below the first functional component 10 and extending in the vehicle width direction. The cross member 30 is located on the vehicle width outward side of the side frame 20. The extending part 32 extended and the weak part 33 provided in the vehicle width inner side rather than the said side frame 20 are provided, It is characterized by the above-mentioned.

本発明によれば、側面衝突時にＩＰＵなどの機能部品を保護することができる。   According to the present invention, it is possible to protect functional parts such as an IPU during a side collision.

本実施形態の車体構造におけるクロスメンバ周辺の構造を車体後方から見た断面図である。It is sectional drawing which looked at the structure of the cross member periphery in the vehicle body structure of this embodiment from the vehicle body rear. 本実施形態の車体構造の底面図（ａ）および（ａ）のＰ２部分の拡大図（ｂ）である。It is the bottom view (a) of the vehicle body structure of this embodiment, and the enlarged view (b) of P2 part of (a). 図１のロアクロスメンバの拡大図（ａ）および図１のＰ１部分の拡大図（ｂ）である。FIG. 2 is an enlarged view (a) of the lower cross member in FIG. 1 and an enlarged view (b) of a P1 portion in FIG. 1. 本実施形態の車体構造におけるクロスメンバ単体の上面図である。It is a top view of the cross member simple substance in the vehicle body structure of this embodiment. 本実施形態の車体構造におけるクロスメンバの車幅中央から右側部分を車体前方から見た図（ａ）、車体後方から見た図（ｂ）および車体上方から見た図（ｃ）である。FIG. 4A is a view of the right side portion of the cross member in the vehicle body structure of the present embodiment from the vehicle width center as viewed from the front of the vehicle body, FIG. 5B is a view from the rear of the vehicle body, and FIG. 補強部材を車体前方から見た図（ａ）、車体後方から見た図（ｂ）および車体下方から見た図（ｃ）である。It is the figure (a) which looked at the reinforcement member from the vehicle body front, the figure (b) seen from the vehicle body back, and the figure (c) seen from the vehicle body lower side. 図１のロアクロスメンバの拡大図（ａ）および（ａ）のＰ３部分の拡大図（ｂ）である。FIG. 2 is an enlarged view (a) of the lower cross member of FIG. 1 and an enlarged view (b) of a P3 portion of (a). 従来の車体構造を示す底面図（ａ）および断面図（ｂ）である。It is the bottom view (a) and sectional drawing (b) which show the conventional vehicle body structure.

以下に、本発明の実施の形態について添付図面を参照して詳細に説明する。   Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

＜全体構成＞まず、図１を参照して、本実施形態の車体構造の全体構成について概略的に説明する。   <Overall Configuration> First, with reference to FIG. 1, the overall configuration of the vehicle body structure of this embodiment will be schematically described.

図１は、本実施形態の車体構造におけるクロスメンバ周辺の構造を車体後方から見た断面図である。また、図１は、後述する図２（ａ）のＡ−Ａ断面において車幅中央から左側だけを示している。   FIG. 1 is a cross-sectional view of the structure around the cross member in the vehicle body structure of the present embodiment as viewed from the rear of the vehicle body. Further, FIG. 1 shows only the left side from the center of the vehicle width in the AA cross section of FIG.

図１に示すように、本実施形態の車体構造１は、フロアパネルの下部に設けられた、ＩＰＵ１０、サイドフレーム２０、ロアクロスメンバ３０、アッパクロスメンバ４０、アウトリガ５０、サイドシル６０を含む。   As shown in FIG. 1, the vehicle body structure 1 of the present embodiment includes an IPU 10, a side frame 20, a lower cross member 30, an upper cross member 40, an outrigger 50, and a side sill 60 provided at the lower part of the floor panel.

ＩＰＵ１０は、インテリジェントパワーユニット（Ｉｎｔｅｌｌｉｇｅｎｔ Ｐｏｗｅｒ Ｕｎｉｔ）と呼ばれるバッテリーモジュールとパワーコントロールユニットからなる電装部品であり、これらがケースに格納されて一体化された構成となっている。ＩＰＵは、ハイブリッド自動車などにおいてモータとエンジンを効率良く駆動するようにモータに供給する電力をコントロールする機能を有する。   The IPU 10 is an electrical component composed of a battery module called an intelligent power unit (Intelligent Power Unit) and a power control unit. These components are housed in a case and integrated. The IPU has a function of controlling electric power supplied to the motor so that the motor and the engine are efficiently driven in a hybrid vehicle or the like.

サイドフレーム２０は、車幅方向の左右両側に車体前後方向に延びている。サイドフレーム２０は車幅方向に切断した形状が矩形状の閉断面を有する。ＩＰＵ１０はシート下部に左右一対のサイドフレーム２０の間であって、車幅方向の中央（図２（ａ）参照）に配置されている。ＩＰＵ１０は、車幅方向の両側縁部１０ａが左右のサイドフレーム２０に固定されると共に、車幅方向両側の下面部１０ｂがロアクロスメンバ３０の上面部に取り付けられた支持部材１２により保持されている。   The side frame 20 extends in the longitudinal direction of the vehicle body on the left and right sides in the vehicle width direction. The side frame 20 has a closed cross section in which the shape cut in the vehicle width direction is rectangular. The IPU 10 is disposed between the pair of left and right side frames 20 at the lower part of the seat and in the center in the vehicle width direction (see FIG. 2A). In the IPU 10, both side edges 10 a in the vehicle width direction are fixed to the left and right side frames 20, and lower surface portions 10 b on both sides in the vehicle width direction are held by support members 12 attached to the upper surface portion of the lower cross member 30. Yes.

ロアクロスメンバ３０は、左右のサイドフレーム２０に連結され、ＩＰＵ１０の下方に突出するように車幅方向に延びている。アッパクロスメンバ４０は、左右のサイドフレーム２０に連結され、ＩＰＵ１０の上方に突出するように車幅方向に延びている。ロアクロスメンバ３０およびアッパクロスメンバ４０は、不図示の車体のセンターピラー辺りに配置される。   The lower cross member 30 is connected to the left and right side frames 20 and extends in the vehicle width direction so as to protrude below the IPU 10. The upper cross member 40 is connected to the left and right side frames 20 and extends in the vehicle width direction so as to protrude above the IPU 10. The lower cross member 30 and the upper cross member 40 are arranged around the center pillar (not shown) of the vehicle body.

アウトリガ４０は、サイドフレーム２０の車幅方向の外側に設けられ、車幅外方に延びている。アウトリガ４０は、車幅方向および車体前後方向に切断した形状が矩形状の閉断面を有する。アウトリガ４０は、サイドフレーム２０の車幅外側の面とロアクロスメンバ３０から車幅外方に延びる延長部３２に隣接している。   The outrigger 40 is provided outside the side frame 20 in the vehicle width direction, and extends outward in the vehicle width. The outrigger 40 has a closed cross section in which the shape cut in the vehicle width direction and the vehicle body longitudinal direction is rectangular. The outrigger 40 is adjacent to the outer side surface of the side frame 20 and the extension 32 extending outward from the lower cross member 30 in the vehicle width direction.

サイドシル６０は、車幅方向の左右両側に車体前後方向に延びている。サイドシル６０はサイドフレーム２０の車幅外側に所定の間隔を持って設けられる。アウトリガ５０は、サイドフレーム２０の車幅外側の面および延長部３２とサイドシル６０の車幅内側の面とを連結する補助フレームである。   The side sill 60 extends in the longitudinal direction of the vehicle body on both the left and right sides in the vehicle width direction. The side sill 60 is provided outside the vehicle width of the side frame 20 with a predetermined interval. The outrigger 50 is an auxiliary frame that connects the surface of the side frame 20 outside the vehicle width and the extension 32 and the surface of the side sill 60 inside the vehicle width.

ＩＰＵ１０はシート下部の左右一対のサイドフレーム２０の間およびロアクロスメンバ３０の間のスペースに配置されている。ロアクロスメンバ３０は、サイドフレーム２０と交差するセンターピラー辺りで車幅外方に拡幅されておらず、車体前後方向にほぼ直線状に延びている。   The IPU 10 is disposed in a space between the pair of left and right side frames 20 and the lower cross member 30 below the seat. The lower cross member 30 is not widened outwardly of the vehicle width around the center pillar that intersects the side frame 20, but extends substantially linearly in the longitudinal direction of the vehicle body.

側面衝突時に車体側面のサイドシル５０から入力される側突荷重はアウトリガ５０が圧縮変形することで吸収すると共に、アウトリガ５０の変形によりサイドフレーム２０は車体前後方向の軸まわりに回転し車幅内方が下方に変位するように変形する。本実施形態では、左右一対のサイドフレーム２０の間隔を拡大しないで第１の機能部品であるＩＰＵ１０をシート下部のフロアパネル２に配置し、側突荷重から保護するものである。   The side impact load input from the side sill 50 on the side of the vehicle body at the time of a side collision is absorbed when the outrigger 50 is compressed and deformed, and the deformation of the outrigger 50 causes the side frame 20 to rotate about the vehicle longitudinal axis and to the inside of the vehicle width. Is deformed so as to be displaced downward. In the present embodiment, the IPU 10 as the first functional component is disposed on the floor panel 2 below the seat without increasing the distance between the pair of left and right side frames 20, and is protected from a side impact load.

＜ＩＰＵの支持構造＞次に、図１に加えて、図２から図７を参照して、本実施形態のフロア下部にＩＰＵ１０を支持する車体構造１の詳細を説明する。   <IPU Support Structure> Next, the details of the vehicle body structure 1 for supporting the IPU 10 in the lower part of the floor according to this embodiment will be described with reference to FIGS. 2 to 7 in addition to FIG.

図２は、本実施形態の車体構造の底面図（ａ）および（ａ）のＰ２部分の拡大図（ｂ）である。図３は、図１のロアクロスメンバの拡大図（ａ）および図１のＰ１部分の拡大図（ｂ）である。図４は、本実施形態の車体構造におけるクロスメンバ単体の上面図である。図５は、本実施形態の車体構造におけるクロスメンバの車幅中央から右側部分を車体前方から見た図（ａ）、車体後方から見た図（ｂ）および車体上方から見た図（ｃ）である。図６は、補強部材を車体前方から見た図（ａ）、車体後方から見た図（ｂ）および車体下方から見た図（ｃ）である。図７は、図１のロアクロスメンバの拡大図（ａ）および（ａ）のＰ３部分の拡大図（ｂ）である。   FIG. 2 is a bottom view (a) of the vehicle body structure of the present embodiment and an enlarged view (b) of the P2 portion of (a). FIG. 3 is an enlarged view (a) of the lower cross member of FIG. 1 and an enlarged view (b) of the P1 portion of FIG. FIG. 4 is a top view of a single cross member in the vehicle body structure of the present embodiment. 5A is a view of the right side portion of the cross member in the vehicle body structure of the present embodiment from the center of the vehicle width as viewed from the front of the vehicle body, FIG. 5B is a view from the rear of the vehicle body, and FIG. It is. 6A is a view of the reinforcing member as viewed from the front of the vehicle body, FIG. 6B is a view as viewed from the rear of the vehicle body, and FIG. 7 is an enlarged view (a) of the lower cross member of FIG. 1 and an enlarged view (b) of the P3 portion of (a).

図１から図５に示すように、ロアクロスメンバ３０は、それぞれ別部材で構成された、第１のメンバ３０Ａと、第２のメンバ３０Ｂと、補強部材３０Ｃとを有する。第１のメンバ３０Ａは車幅方向の中央に設けられ、第２のメンバ３０Ｂは第１のメンバ３０Ａの車幅方向の両端部から左右の車幅外方に延びている。補強部材３０Ｃは、第１のメンバ３０Ａと第２のメンバ３０Ｂとに跨って設けられる。   As shown in FIGS. 1 to 5, the lower cross member 30 includes a first member 30 </ b> A, a second member 30 </ b> B, and a reinforcing member 30 </ b> C, each of which is composed of separate members. The first member 30A is provided at the center in the vehicle width direction, and the second member 30B extends outward from the left and right vehicle widths from both ends of the first member 30A in the vehicle width direction. The reinforcing member 30C is provided across the first member 30A and the second member 30B.

第１のメンバ３０Ａは、ＩＰＵ１０の下面部１０ｂに沿って水平に延びる中央部３１を備える。なお、中央部３１は、ＩＰＵ１０の下面部１０ｂに沿った形状であればよく、水平形状でなくてもよい。   The first member 30 </ b> A includes a central portion 31 that extends horizontally along the lower surface portion 10 b of the IPU 10. In addition, the center part 31 should just be a shape along the lower surface part 10b of IPU10, and does not need to be a horizontal shape.

第２のメンバ３０Ｂは、サイドフレーム２０よりも車幅外方に延びる延長部３２と、サイドフレーム２０よりも車幅内方に設けられた傾斜部３４とを備える。補強部材３０Ｃは傾斜部３４を補強する。延長部３２は、サイドシル６０からサイドフレーム２０に向かって延びている。傾斜部３４は、サイドフレーム２０からＩＰＵ１０に向かって下方に傾斜している。傾斜部３４は、下方に傾斜すると共に車幅内方に水平に延びて第１のメンバ３０Ａの中央部３１に接続され、中央部３１と傾斜部３４との接続部分に脆弱部３３が形成される。詳しくは、脆弱部３３は、第１のメンバ３０Ａの中央部３１における車幅外方側の端部と、第２のメンバ３０Ｂの傾斜部３４から中央部３１に水平に延びる車幅内方側端部と、補強部材３０Ｃにおける中央部３１の車幅外方側端部と傾斜部３４の車幅内方側端部の接続部分に形成される。   The second member 30 </ b> B includes an extension portion 32 that extends outward in the vehicle width from the side frame 20, and an inclined portion 34 that is provided inward of the vehicle width from the side frame 20. The reinforcing member 30C reinforces the inclined portion 34. The extension 32 extends from the side sill 60 toward the side frame 20. The inclined portion 34 is inclined downward from the side frame 20 toward the IPU 10. The inclined portion 34 inclines downward and extends horizontally inward of the vehicle width and is connected to the central portion 31 of the first member 30A, and a fragile portion 33 is formed at a connection portion between the central portion 31 and the inclined portion 34. The Specifically, the fragile portion 33 includes an end portion on the vehicle width outward side in the central portion 31 of the first member 30A, and a vehicle width inward side extending horizontally from the inclined portion 34 of the second member 30B to the central portion 31. It is formed at the connecting portion between the end portion, the vehicle width outward end portion of the central portion 31 and the vehicle width inward end portion of the inclined portion 34 in the reinforcing member 30C.

側面衝突時に延長部３２はサイドフレーム２０よりも先に荷重を受ける。脆弱部３３は、延長部３２が受けた側突荷重によって変形する。このように、ロアクロスメンバ３０が曲折して側突荷重を吸収することにより、サイドフレーム２０が車幅方向に変位することを防止できる。詳しくは、サイドフレーム２０は、図１の仮想線２０’に示すように、側突荷重を受けても車幅内方には変位しないで、サイドフレーム２０の車体前後方向の軸まわりであるＲ１方向に回転する。これにより、サイドフレーム２０がＩＰＵ１０と衝突することを回避できる。   The extension 32 receives a load before the side frame 20 at the time of a side collision. The fragile portion 33 is deformed by a side impact load received by the extension portion 32. As described above, the lower cross member 30 is bent and absorbs the side collision load, whereby the side frame 20 can be prevented from being displaced in the vehicle width direction. Specifically, as shown by the imaginary line 20 ′ in FIG. 1, the side frame 20 is not displaced inward in the vehicle width even when subjected to a side impact load, and is around the axis of the side frame 20 in the longitudinal direction of the vehicle body. Rotate in the direction. Thereby, it can avoid that the side frame 20 collides with IPU10.

また、側面衝突時に第２のメンバ３０Ｂの傾斜部３４が第１のメンバ３０Ａの中央部３１を折り曲げ、中央部３１を下方に押し下げる方向に変形させる。これにより、第２のメンバ３０Ｂの中央部３１がＩＰＵ１０の下面部１０ｂから離間する方向に変形するので、ＩＰＵ１０との接触を回避し保護することができる。また、第２のメンバ３０Ｂの傾斜部３４が第１のメンバ３０Ａの中央部３１をより大きく変形させることで、大きな側突荷重を吸収できる。   Further, at the time of a side collision, the inclined portion 34 of the second member 30B bends the central portion 31 of the first member 30A and deforms the central portion 31 so as to push it downward. Thereby, since the center part 31 of the 2nd member 30B deform | transforms in the direction away from the lower surface part 10b of IPU10, a contact with IPU10 can be avoided and protected. In addition, since the inclined portion 34 of the second member 30B deforms the central portion 31 of the first member 30A more greatly, a large side impact load can be absorbed.

図２（ｂ）に示すように、第１のメンバ３０Ａの中央部３１は、ＩＰＵ１０の下面部１０ｂに上下方向にスポット溶接などで接合される。第１のメンバ３０Ａの中央部３１の側縁部の複数箇所３５がＩＰＵ１０の下面部１０ｂに接合される。側面衝突時に第２のメンバ３０Ｂの傾斜部３４が第１のメンバ３０Ａの中央部３１を下方に押し下げるが、その際に第１のメンバ３０Ａの中央部３１とＩＰＵ１０の下面部１０ｂとの溶接箇所３５が剥離されることで側突荷重を吸収できる。なお、フロアパネル２よりもロアクロスメンバ３０の方が強度が高いので、容易に剥離できる。   As shown in FIG. 2B, the central portion 31 of the first member 30A is joined to the lower surface portion 10b of the IPU 10 in the vertical direction by spot welding or the like. A plurality of locations 35 on the side edge of the central portion 31 of the first member 30 </ b> A are joined to the lower surface portion 10 b of the IPU 10. The inclined portion 34 of the second member 30B pushes down the central portion 31 of the first member 30A downward at the time of a side collision. At this time, the welded portion between the central portion 31 of the first member 30A and the lower surface portion 10b of the IPU 10 Side impact load can be absorbed by peeling 35. Since the lower cross member 30 has higher strength than the floor panel 2, it can be easily peeled off.

図３（ｂ）に示すように、ロアクロスメンバ３０は、別部材である第１のメンバ３０Ａと第２のメンバ３０Ｂが接続されて構成される。第２のメンバ３０Ｂの車幅内方側の端部３４ａは第１のメンバ３０Ａの中央部３１の車幅外方側の端部３１ａに挿入され、補強部材３０Ｃの脆弱部３３において重なるように接合される。第２のメンバ３０Ｂの車幅内方側の端部３４ａは、第１のメンバ３０Ａの中央部３１の車幅外方側の端部３１ａの上側に差し込まれ、両部材の側縁部が複数箇所３６（図２（ｂ）参照）でスポット溶接などで接合される。これにより、側面衝突時に第２のメンバ３０Ｂの車幅内方側の端部３４ａが第１のメンバ３０Ａの中央部３１を確実に押し下げる。第２のメンバ３０Ｂの車幅内方側の端部３４ａと第１のメンバ３０Ａの中央部３１の車幅外方側の端部３１ａの上下関係が反対になっている場合、第２のメンバ３０Ｂの車幅内方側の端部３４ａが、第１のメンバ３０Ａの中央部３１の車幅外方側の端部３１ａから離間してしまい、第１のメンバ３０Ａの中央部３１を押し下げることはできなくなる。   As shown in FIG. 3B, the lower cross member 30 is configured by connecting a first member 30A and a second member 30B, which are separate members. An end 34a on the vehicle width inward side of the second member 30B is inserted into an end 31a on the vehicle width outward side of the central portion 31 of the first member 30A, and overlaps at the fragile portion 33 of the reinforcing member 30C. Be joined. The end 34a on the vehicle width inward side of the second member 30B is inserted above the end 31a on the vehicle width outward side of the central portion 31 of the first member 30A, and there are a plurality of side edges of both members. It joins by spot welding etc. in the location 36 (refer FIG.2 (b)). Thereby, the end 34a on the vehicle width inward side of the second member 30B surely pushes down the central portion 31 of the first member 30A during a side collision. When the vertical relationship between the end 34a on the vehicle width inward side of the second member 30B and the end 31a on the vehicle width outward side of the central portion 31 of the first member 30A is opposite, the second member The end portion 34a on the vehicle width inner side of 30B is separated from the end portion 31a on the vehicle width outer side of the central portion 31 of the first member 30A, and the central portion 31 of the first member 30A is pushed down. Can not.

また、脆弱部３３が形成される第２のメンバ３０Ｂの車幅内方側の端部３４ａと第１のメンバ３０Ａの中央部３１の車幅外方側の端部３１ａとの接合部分を所定の間隔を空けてスポット溶接で接合することで、第１のメンバ３０Ａと第２のメンバ３０Ｂの接合部分に形成される脆弱部３３がロアクロスメンバ３０の他の部分よりも脆弱になる。なお、接合手段はスポット溶接に限定されず、断続的なミグ溶接や無接合でもよい。   Further, a joint portion between the end 34a on the vehicle width inward side of the second member 30B where the weakened portion 33 is formed and the end 31a on the vehicle width outward side of the central portion 31 of the first member 30A is predetermined. By connecting the first member 30 </ b> A and the second member 30 </ b> B with each other by spot welding, the weakened portion 33 formed at the joint portion between the first member 30 </ b> A and the second member 30 </ b> B becomes weaker than the other portions of the lower cross member 30. The joining means is not limited to spot welding, but may be intermittent MIG welding or non-joining.

補強部材３０Ｃは、図３に示すように、第２のメンバ３０Ｂにおける傾斜部３４から第１のメンバ３０Ａの中央部３１に沿ってくの字状に延びている。補強部材３０Ｃは、図６に示すように、第２のメンバ３０Ｂの傾斜部３４から第１のメンバ３０Ａの中央部３１の形状に沿ってくの字状に折れ曲がる底面部３７と、底面部３７の車体前方側で上方に起立する前壁部３８と、底面部３７の車体後方側で上方に起立する後壁部３９とを有する。底面部３７には凹形状の脆弱部３３が形成されている。前壁部３８は後壁部３９よりも低く形成され、後壁部３９は第２のメンバ３０Ｂの傾斜部３４の高さよりも低く形成されている。   As shown in FIG. 3, the reinforcing member 30C extends from the inclined portion 34 of the second member 30B along the central portion 31 of the first member 30A in a dogleg shape. As shown in FIG. 6, the reinforcing member 30 </ b> C includes a bottom surface portion 37 that bends in a dogleg shape along the shape of the central portion 31 of the first member 30 </ b> A from the inclined portion 34 of the second member 30 </ b> B, It has a front wall portion 38 that rises upward on the front side of the vehicle body and a rear wall portion 39 that stands upward on the vehicle body rear side of the bottom surface portion 37. A concave fragile portion 33 is formed on the bottom surface portion 37. The front wall portion 38 is formed lower than the rear wall portion 39, and the rear wall portion 39 is formed lower than the height of the inclined portion 34 of the second member 30B.

補強部材３０Ｃは、第２のメンバ３０Ｂの傾斜部３４が第１のメンバ３０Ａの中央部３１に向かって水平に折れ曲がるコーナー部３４ｂを補強する。傾斜部３４における脆弱部３３よりも車幅外方側のコーナー部３４ｂを補強部材３０Ｃで補強することで、側突荷重によりロアクロスメンバ３０における第２のメンバ３０Ｂが脆弱部３３よりも車幅外方側のコーナー部３４ｂで折れ曲がることを防止し、確実に脆弱部３３付近で折れ曲がるように構成できる。言い換えると、コーナー部３４ｂが折れ曲がることで、第１のメンバ３０Ａの中央部３１が押し上げられることを防止できる。   The reinforcing member 30C reinforces the corner portion 34b where the inclined portion 34 of the second member 30B is bent horizontally toward the central portion 31 of the first member 30A. By reinforcing the corner portion 34b of the inclined portion 34 on the outer side of the fragile portion 33 with the reinforcing member 30C, the second member 30B of the lower cross member 30 is wider than the fragile portion 33 with respect to the vehicle width. It is possible to prevent the outer corner portion 34b from being bent and to be surely bent in the vicinity of the fragile portion 33. In other words, it is possible to prevent the central portion 31 of the first member 30A from being pushed up by bending the corner portion 34b.

また、補強部材３０Ｃは傾斜部３４における脆弱部３３よりも車幅内方側であって第１のメンバ３０Ａの中央部３１の内面まで延びている。これにより、第２のメンバ３０Ｂを脆弱部３３付近で確実に下方に折り曲げ、補強部材３０Ｃによって第１のメンバ３０Ａの中央部３１を直接押し下げることができる。   Further, the reinforcing member 30C extends to the inner side of the central portion 31 of the first member 30A on the inward side of the vehicle width from the fragile portion 33 in the inclined portion 34. Accordingly, the second member 30B can be reliably bent downward near the fragile portion 33, and the central portion 31 of the first member 30A can be pushed down directly by the reinforcing member 30C.

図１に示すように、アッパクロスメンバ４０は、左右のサイドフレーム２０の上面部２０ａの車幅外方側に取り付けられる。これにより、サイドフレーム２０の車体前後方向の軸まわりの車幅外方側への回転Ｒ１を許容しつつ、サイドフレーム２０の車幅内方側への変位を防止できる。また、側突荷重をアッパクロスメンバ４０に分散することができるので、大きな側突荷重に対してＩＰＵ１０を保護できる。   As shown in FIG. 1, the upper cross member 40 is attached to the vehicle width outward side of the upper surface portion 20 a of the left and right side frames 20. Accordingly, it is possible to prevent the side frame 20 from being displaced inward in the vehicle width while allowing the rotation R1 of the side frame 20 around the vehicle longitudinal axis in the vehicle width outward direction. Further, since the side collision load can be distributed to the upper cross member 40, the IPU 10 can be protected against a large side collision load.

ロアクロスメンバ３０における第２のメンバ３０Ｂの延長部３２は、アウトリガ５０の下面部５０ａとの間で閉断面３２ａを形成し、閉断面３２ａは、車幅外方のサイドシル６０側に向かうほど断面積（上下方向の幅）が小さくなるように形成されている。また、延長部３２とアウトリガ５０はサイドシル６０の上下方向の幅寸法の範囲内に配置される。   The extension 32 of the second member 30B of the lower cross member 30 forms a closed section 32a with the lower surface 50a of the outrigger 50, and the closed section 32a is cut off toward the side sill 60 outside the vehicle width. The area (width in the vertical direction) is formed to be small. Further, the extension portion 32 and the outrigger 50 are disposed within the range of the width dimension of the side sill 60 in the vertical direction.

側面衝突時に第２のメンバ３０Ｂの延長部３２はアウトリガ５０と共に軸方向（車幅方向）に圧潰して荷重を吸収しつつ、脆弱部３２側に直接荷重を伝達することができる。閉断面３２ａにおけるサイドシル６０側（車幅外方側）の閉断面が小さいので、アウトリガ５０および第２のメンバ３０Ｂの延長部３２の軸方向の圧潰を阻害しにくい構造となる。   The extension part 32 of the second member 30B can transmit the load directly to the fragile part 32 side while collapsing in the axial direction (vehicle width direction) together with the outrigger 50 and absorbing the load at the time of a side collision. Since the closed cross section on the side sill 60 side (the vehicle width outward side) in the closed cross section 32a is small, it becomes a structure in which the axial crushing of the outrigger 50 and the extension part 32 of the second member 30B is difficult to be inhibited.

また、図５（ａ）に示すように、クロスメンバ３０を車幅方向から見たときに、補強部材３０Ｃの脆弱部３３付近の断面積Ｄ１は、脆弱部３３より車幅外方側であって第２のメンバ３０Ｂの傾斜部３４の車幅内方側の部位の断面積Ｄ２および脆弱部３３より車幅内方側の第１のメンバ３０Ａの中央部３１の断面積Ｄ３よりも小さい。補強部材３０Ｃの脆弱部３２付近の断面積をロアクロスメンバ３０における他の部位よりも小さくすることで、より確実に補強部材３０Ｃの脆弱部３２でロアクロスメンバ３０を下方に折り曲げることができる。   Further, as shown in FIG. 5A, when the cross member 30 is viewed from the vehicle width direction, the cross-sectional area D1 in the vicinity of the fragile portion 33 of the reinforcing member 30C is outside the vehicle width from the fragile portion 33. The cross-sectional area D2 of the portion on the vehicle width inward side of the inclined portion 34 of the second member 30B and the cross-sectional area D3 of the central portion 31 of the first member 30A on the vehicle width inward side of the fragile portion 33 are smaller. By making the cross-sectional area near the fragile portion 32 of the reinforcing member 30C smaller than other portions of the lower cross member 30, the lower cross member 30 can be bent downward more reliably at the fragile portion 32 of the reinforcing member 30C.

図７に示すように、ロアクロスメンバ３０における第２のメンバ３０Ｂの延長部３２は、傾斜部３４から車幅外方側に向かって水平に延びる水平部３２ｂを備える。水平部３２ｂの下方かつ傾斜部３４の下端部（コーナー部３４ｂ）のライン３４ｃよりも上方の範囲にフューエル配管７０が配置される。フューエル配管７０は、ＩＰＵ１０の車体後方側に隣接して配置される燃料タンク１１（図２参照）から車体前方側に延びている。これにより、水平部３２ｂと傾斜部３４との間の空間を利用して第２の機能部品であるフューエル配管７０を収容し保持することができる。   As shown in FIG. 7, the extension part 32 of the second member 30B in the lower cross member 30 includes a horizontal part 32b extending horizontally from the inclined part 34 toward the vehicle width outward side. The fuel pipe 70 is disposed in a range below the horizontal portion 32b and above the line 34c at the lower end portion (corner portion 34b) of the inclined portion 34. The fuel pipe 70 extends from the fuel tank 11 (see FIG. 2) disposed adjacent to the rear side of the vehicle body of the IPU 10 to the front side of the vehicle body. Thereby, the fuel piping 70 which is a 2nd functional component can be accommodated and hold | maintained using the space between the horizontal part 32b and the inclination part 34. FIG.

フューエル配管７０は、クリップ７１などの支持手段により水平部３２ｂに取り付けられる。クリップ７１は水平部３２ｂから下方に延びるスタットボルト７２などの固定手段に取り付けられる。クリップ７１はスタットボルト７２に対して下方から上方へ差し込むことよって水平部３２ｂに取り付けられる。   The fuel pipe 70 is attached to the horizontal portion 32b by support means such as a clip 71. The clip 71 is attached to fixing means such as a stat bolt 72 extending downward from the horizontal portion 32b. The clip 71 is attached to the horizontal portion 32b by being inserted into the stat bolt 72 from below to above.

側面衝突時に第２のメンバ３０Ｂの傾斜部３４の上端部３４ｄおよびそれに連続する水平部３２ｂが下方Ｓ１に変位することでフューエル配管７０と干渉し、てこの原理でクリップ７１がスタットボルト７２から下方Ｓ２に抜け落ちて、フューエル配管７０を水平部３２ｂの下方に離脱させる。これにより、サイドシル６０と傾斜部３４との間にフューエル配管７０が挟まれることを防止できる。   At the time of a side collision, the upper end 34d of the inclined portion 34 of the second member 30B and the horizontal portion 32b continuous therewith are displaced downward S1 to interfere with the fuel pipe 70, and the clip 71 is lowered from the stat bolt 72 by the lever principle. The fuel pipe 70 falls off to the lower side of the horizontal portion 32b after dropping into S2. Thereby, it is possible to prevent the fuel pipe 70 from being sandwiched between the side sill 60 and the inclined portion 34.

［実施形態のまとめ］
＜第１の態様＞
車両の前後方向に延びるサイドフレーム２０と、
前記サイドフレーム２０の車幅内方側に設けられる第１の機能部品１０と、
前記サイドフレーム２０から前記第１の機能部品１０の下方に突出し車幅方向に延びるクロスメンバ３０と、を備え、
前記クロスメンバ３０は、前記サイドフレーム２０よりも車幅外方側に延びる延長部３２と、
前記サイドフレーム２０よりも車幅内方側に設けられた脆弱部３３とを備えることを特徴とする。 [Summary of Embodiment]
<First aspect>
A side frame 20 extending in the longitudinal direction of the vehicle;
A first functional component 10 provided on the vehicle width inner side of the side frame 20;
A cross member 30 protruding from the side frame 20 below the first functional component 10 and extending in the vehicle width direction,
The cross member 30 includes an extension 32 extending outward in the vehicle width direction from the side frame 20, and
It is provided with the weak part 33 provided in the vehicle width inner side rather than the said side frame 20. It is characterized by the above-mentioned.

第１の態様によれば、側面衝突時に延長部３２はサイドフレーム２０よりも先に荷重を受ける。脆弱部３３は、延長部３２が受けた側突荷重によって変形する。このように、クロスメンバ３０が曲折して側突荷重を吸収することにより、サイドフレーム２０が車幅方向に変位することを防止できる。詳しくは、サイドフレーム２０は、側突荷重を受けても車幅内方には変位しないで、サイドフレーム２０の車体前後方向の軸まわりに回転する。これにより、サイドフレーム２０が第１の機能部品１０と衝突することを回避できる。   According to the first aspect, the extension portion 32 receives a load before the side frame 20 at the time of a side collision. The fragile portion 33 is deformed by a side impact load received by the extension portion 32. As described above, the cross member 30 is bent to absorb the side collision load, whereby the side frame 20 can be prevented from being displaced in the vehicle width direction. Specifically, the side frame 20 does not move inward of the vehicle width even when subjected to a side collision load, but rotates about the axis of the side frame 20 in the longitudinal direction of the vehicle body. Thereby, it can avoid that the side frame 20 collides with the 1st functional component 10. FIG.

＜第２の態様＞
第１の態様において、前記クロスメンバ３０は、前記サイドフレーム２０から前記第１の機能部品１０に向かって下方に傾斜する傾斜部３４と、前記第１の機能部品１０の下面部１０ｂに沿って車幅方向に延びる中央部３１と、を備え、
前記脆弱部３３は、前記中央部３１に形成されることを特徴とする。 <Second aspect>
In the first aspect, the cross member 30 extends along the inclined portion 34 inclined downward from the side frame 20 toward the first functional component 10 and the lower surface portion 10 b of the first functional component 10. A central portion 31 extending in the vehicle width direction,
The weak part 33 is formed in the central part 31.

第２の態様によれば、側面衝突時に傾斜部３４が中央部３１を折り曲げ、中央部３１を下方に押し下げる方向に変形させる。これにより、中央部３１が第１の機能部品１０の下面部１０ｂから離間する方向に変形するので、第１の機能部品１０との接触を回避し保護することができる。また、傾斜部３４が中央部３１をより大きく変形させることで、大きな側突荷重を吸収できる。   According to the 2nd aspect, the inclined part 34 bends the center part 31 at the time of a side collision, and it deform | transforms it in the direction which pushes down the center part 31 below. Thereby, since the center part 31 deform | transforms in the direction spaced apart from the lower surface part 10b of the 1st functional component 10, a contact with the 1st functional component 10 can be avoided and protected. Moreover, since the inclined portion 34 deforms the central portion 31 more greatly, a large side collision load can be absorbed.

＜第３の態様＞
第２の態様において、前記中央部３１は、前記第１の機能部品１０の下面部１０ｂに上下方向に接合されることを特徴とする。 <Third Aspect>
In the second aspect, the center portion 31 is joined to the lower surface portion 10b of the first functional component 10 in the vertical direction.

第３の態様によれば、側面衝突時に傾斜部３４が中央部３１を下方に押し下げるが、その際に中央部３１と第１の機能部品０の下面部１０ｂとの溶接箇所３５が剥離されることで側突荷重を吸収できる。   According to the third aspect, the inclined portion 34 pushes down the central portion 31 downward at the time of a side collision, but at that time, the welded portion 35 between the central portion 31 and the lower surface portion 10b of the first functional component 0 is peeled off. This can absorb the side impact load.

＜第４の態様＞
第２または第３の態様において、前記傾斜部３４と前記中央部３１は別部品で構成され、
前記脆弱部３３は、前記傾斜部３４と前記中央部３１の接合部分に形成され、
前記傾斜部３４の車幅内方側の端部３４ａは、前記中央部３１の車幅外方側の端部３１ａの上側に差し込まれることを特徴とする。 <Fourth aspect>
In the second or third aspect, the inclined portion 34 and the central portion 31 are configured as separate parts,
The fragile portion 33 is formed at a joint portion between the inclined portion 34 and the central portion 31,
An end portion 34a on the vehicle width inward side of the inclined portion 34 is inserted into an upper side of an end portion 31a on the vehicle width outward side of the central portion 31.

第４の態様によれば、側面衝突時にクロスメンバ３０の車幅内方側の端部３４ａがクロスメンバ３０の中央部３１を確実に押し下げる。   According to the fourth aspect, the end 34a on the vehicle width inward side of the cross member 30 reliably pushes down the central portion 31 of the cross member 30 during a side collision.

＜第５の態様＞
第１から第４のいずれかの態様において、前記傾斜部３４から前記中央部３１に沿って車幅内方側に延びて、前記傾斜部３４と前記中央部３１との間のコーナー部３４ｂを補強する補強部材３０Ｃを設けたことを特徴とする。 <Fifth aspect>
In any one of the first to fourth aspects, a corner portion 34b extending from the inclined portion 34 to the vehicle width inward side along the central portion 31 is provided between the inclined portion 34 and the central portion 31. A reinforcing member 30C for reinforcement is provided.

第５の態様によれば、脆弱部３３よりも車幅外方側のコーナー部３４ｂを補強部材３０Ｃで補強することで、側突荷重によりクロスメンバ３０が脆弱部３３よりも車幅外方側のコーナー部３４ｂで折れ曲がることを防止し、確実に脆弱部３３で折れ曲がるように構成できる。言い換えると、コーナー部３４ｂが折れ曲がることで、クロスメンバ３０の中央部３１が押し上げられることを防止できる。   According to the fifth aspect, by reinforcing the corner portion 34b on the vehicle width outward side with respect to the fragile portion 33 with the reinforcing member 30C, the cross member 30 is on the vehicle width outward side with respect to the fragile portion 33 due to a side collision load. It is possible to prevent the corner portion 34b from being bent and to reliably bend the weak portion 33. In other words, it is possible to prevent the center portion 31 of the cross member 30 from being pushed up by bending the corner portion 34b.

＜第６の態様＞
第５の態様において、前記補強部材３０Ｃは前記脆弱部３３よりも車幅内方側に延びている。 <Sixth aspect>
In the fifth aspect, the reinforcing member 30C extends inwardly of the vehicle width from the fragile portion 33.

第６の態様によれば、クロスメンバ３０を脆弱部３３で確実に下方に折り曲げ、補強部材３０Ｃによってクロスメンバ３０の中央部３１を直接押し下げることができる。   According to the sixth aspect, the cross member 30 can be reliably bent downward at the fragile portion 33, and the central portion 31 of the cross member 30 can be pushed down directly by the reinforcing member 30C.

＜第７の態様＞
第１から第６のいずれかの態様において、前記サイドフレーム２０から前記第１の機能部品１０の上方に突出し車幅方向に延びるアッパクロスメンバ４０を備え、
前記アッパクロスメンバ４０は、前記サイドフレーム２０の上面部２０ａの車幅外方側に取り付けられることを特徴とする。 <Seventh aspect>
In any one of the first to sixth aspects, an upper cross member 40 protruding from the side frame 20 above the first functional component 10 and extending in the vehicle width direction is provided.
The upper cross member 40 is attached to the vehicle width outward side of the upper surface portion 20 a of the side frame 20.

第７の態様によれば、サイドフレーム２０の車体前後方向の軸まわりの車幅外方側への回転Ｒ１を許容しつつ、サイドフレーム２０の車幅内方側への変位を防止できる。また、側突荷重をアッパクロスメンバ４０に分散することができるので、大きな側突荷重に対して第１の機能部品１０を保護できる。   According to the seventh aspect, it is possible to prevent the side frame 20 from being displaced inward in the vehicle width while allowing the rotation R1 of the side frame 20 around the vehicle longitudinal direction axis to the vehicle width outward side. Further, since the side collision load can be distributed to the upper cross member 40, the first functional component 10 can be protected against a large side collision load.

＜第８の態様＞
第１から第７のいずれかの態様において、前記サイドフレーム２０の車幅外方側に設けられたサイドシル６０と、
前記サイドシル６０と前記サイドフレーム２０の間に設けられるアウトリガ５０と、を備え、
前記延長部３２は、前記アウトリガ５０の下面部５０ａとの間で閉断面３２ａを形成し、
前記閉断面３２ａは、車体外方側に向かうほど断面積が小さくなるように形成される。 <Eighth aspect>
In any one of the first to seventh aspects, the side sill 60 provided on the vehicle width outer side of the side frame 20;
An outrigger 50 provided between the side sill 60 and the side frame 20,
The extension portion 32 forms a closed section 32a with the lower surface portion 50a of the outrigger 50,
The closed cross section 32a is formed so that the cross-sectional area becomes smaller toward the outer side of the vehicle body.

第８の態様によれば、側面衝突時に延長部３２はアウトリガ５０と共に軸方向（車幅方向）に圧潰して荷重を吸収しつつ、脆弱部３２側に直接荷重を伝達することができる。閉断面３２ａにおけるサイドシル６０側（車幅外方側）の閉断面が小さいので、アウトリガ５０および延長部３２の軸方向の圧潰を阻害しにくい構造となる。   According to the 8th aspect, the extension part 32 can transmit a load directly to the weak part 32 side, crushing to an axial direction (vehicle width direction) and absorbing a load with the outrigger 50 at the time of a side collision. Since the closed cross section on the side sill 60 side (the vehicle width outward side) of the closed cross section 32a is small, the structure is such that the axial crushing of the outrigger 50 and the extension portion 32 is difficult to be inhibited.

＜第９の態様＞
第１から第８のいずれかの態様において、前記クロスメンバ３０における前記脆弱部３３が設けられる部位の断面積Ｄ１は、前記延長部３２より車幅内方側であって前記脆弱部３３より車幅外方側の部位の断面積Ｄ２および前記脆弱部３３より車幅内方側の部位の断面積Ｄ３よりも小さいことを特徴とする。 <Ninth aspect>
In any one of the first to eighth aspects, the cross-sectional area D1 of the portion of the cross member 30 where the fragile portion 33 is provided is on the vehicle width inward side of the extension portion 32 and is closer to the vehicle than the fragile portion 33. It is characterized by being smaller than the cross-sectional area D2 of the portion on the outer side of the width and the cross-sectional area D3 of the portion on the inner side of the vehicle width from the fragile portion 33.

第９の態様によれば、脆弱部３２付近の断面積をクロスメンバ３０における他の部位よりも小さくすることで、より確実に脆弱部３２でクロスメンバ３０を下方に折り曲げることができる。   According to the ninth aspect, by making the cross-sectional area in the vicinity of the fragile portion 32 smaller than other portions in the cross member 30, the cross member 30 can be more reliably bent downward by the fragile portion 32.

＜第１０の態様＞
第１から第９のいずれかの態様において、前記クロスメンバ３０は、前記傾斜部３４から車幅外方側に向かって水平に延びる水平部３２ｂを備え、
前記水平部３２ｂの下方かつ前記傾斜部３４の下端部３４ｃよりも上方に第２の機能部品７０が配置されることを特徴とする。 <Tenth aspect>
In any one of the first to ninth aspects, the cross member 30 includes a horizontal portion 32b extending horizontally from the inclined portion 34 toward the vehicle width outward side,
A second functional component 70 is disposed below the horizontal portion 32b and above the lower end portion 34c of the inclined portion 34.

第１０の態様によれば、水平部３２ｂと傾斜部３４との間の空間を利用して第２の機能部品７０を収容し保持することができる。   According to the 10th aspect, the 2nd functional component 70 can be accommodated and hold | maintained using the space between the horizontal part 32b and the inclination part 34. FIG.

＜第１１の態様＞
第１０の態様において、前記第２の機能部品７０は、下方から上方向への差し込みによって前記水平部３２ｂに取り付けられる。 <Eleventh aspect>
In the tenth aspect, the second functional component 70 is attached to the horizontal portion 32b by insertion from below to above.

第１１の態様によれば、側面衝突時に傾斜部３４およびそれに連続する水平部３２ｂが下方Ｓ１に変位することで第２の機能部品７０と干渉し、第２の機能部品７０を水平部３２ｂの下方に離脱させる。これにより、サイドシル６０と傾斜部３４との間に第２の機能部品７０が挟まれることを防止できる。   According to the eleventh aspect, the inclined portion 34 and the horizontal portion 32b continuing to the inclined portion 34 are displaced downward S1 at the time of a side collision, thereby interfering with the second functional component 70 and causing the second functional component 70 to move to the horizontal portion 32b. Let go down. Thereby, it is possible to prevent the second functional component 70 from being sandwiched between the side sill 60 and the inclined portion 34.

１…車体構造
１０…ＩＰＵ（第１の機能部品）
１０ａ…側縁部１０ａ
１０ｂ…下面部
１１…燃料タンク
１２…支持部材
２０…サイドフレーム
２０’…サイドフレーム（側突荷重による回転後）
２０ａ…上面部
３０…ロアクロスメンバ
３０Ａ…第１のメンバ
３０Ｂ…第２のメンバ
３０Ｃ…補強部材
３１…中央部
３１ａ…車幅外方側の端部
３２…延長部
３２ａ…閉断面
３２ｂ…水平部
３３…脆弱部
３４…傾斜部
３４ａ…車幅内方側の端部
３４ｂ…コーナー部
３４ｃ…下端部のライン
３４ｄ…上端部
３５、３６…ＩＰＵとクロスメンバの溶接箇所
３７…底面部
３８…前壁部
３９…後壁部
４０…アッパクロスメンバ
５０…アウトリガ
５０ａ…下面部
６０…サイドシル
７０…フューエル配管（第２の機能部品）
７１…クリップ
７２…スタッドボルト
Ｄ１…脆弱部の断面積
Ｄ２…傾斜部の車幅内方側の部位の断面積
Ｄ３…中央部の断面積
Ｒ１…側突荷重によるサイドフレーム２０の回転方向
Ｓ１…側突荷重による水平部３２ｂおよび傾斜部３４の変位方向
Ｓ２…側突荷重によるフューエル配管７０の脱落方向 1 ... body structure 10 ... IPU (first functional component)
10a ... side edge 10a
10b ... lower surface 11 ... fuel tank 12 ... support member 20 ... side frame 20 '... side frame (after rotation due to side impact load)
20a ... Upper surface part 30 ... Lower cross member 30A ... First member 30B ... Second member 30C ... Reinforcing member 31 ... Center part 31a ... End 32 on the vehicle width outward side ... Extension part 32a ... Closed section 32b ... Horizontal Part 33 ... Fragile part 34 ... Inclined part 34a ... End 34b on the inner side of the vehicle width ... Corner part 34c ... Line 34d on the lower end part ... Upper end part 35, 36 ... Welded point 37 of the IPU and cross member ... Bottom face part 38 ... Front wall portion 39 ... Rear wall portion 40 ... Upper cross member 50 ... Outrigger 50a ... Lower surface portion 60 ... Side sill 70 ... Fuel piping (second functional component)
71 ... Clip 72 ... Stud bolt D1 ... Cross-sectional area D2 of the fragile part ... Cross-sectional area D3 of the portion on the inner side of the vehicle width of the inclined part ... Cross-sectional area R1 of the central part ... Displacement direction S2 of the horizontal portion 32b and the inclined portion 34 due to the side impact load...

Claims (11)

車両の前後方向に延びるサイドフレームと、
前記サイドフレームの車幅内方側に設けられる第１の機能部品と、
前記サイドフレームから前記第１の機能部品の下方に突出し車幅方向に延びるクロスメンバと、を備え、
前記クロスメンバは、前記サイドフレームよりも車幅外方側に延びる延長部と、
前記サイドフレームよりも車幅内方側に設けられた脆弱部とを備えることを特徴とする車体構造。 A side frame extending in the longitudinal direction of the vehicle;
A first functional component provided on the vehicle width inner side of the side frame;
A cross member protruding from the side frame below the first functional component and extending in the vehicle width direction,
The cross member includes an extension extending outward in the vehicle width from the side frame,
A vehicle body structure comprising: a fragile portion provided on the inner side of the vehicle width from the side frame. 前記クロスメンバは、前記サイドフレームから前記第１の機能部品に向かって下方に傾斜する傾斜部と、前記第１の機能部品の下面部に沿って車幅方向に延びる中央部と、を備え、
前記脆弱部は、前記中央部に形成されることを特徴とする請求項１に記載の車体構造。 The cross member includes an inclined portion that is inclined downward from the side frame toward the first functional component, and a central portion that extends in a vehicle width direction along a lower surface portion of the first functional component,
The vehicle body structure according to claim 1, wherein the fragile portion is formed in the central portion. 前記中央部は、前記第１の機能部品の下面部に上下方向に接合されることを特徴とする請求項２に記載の車体構造。   The vehicle body structure according to claim 2, wherein the central portion is joined in a vertical direction to a lower surface portion of the first functional component. 前記傾斜部と前記中央部は別部品で構成され、
前記脆弱部は、前記傾斜部と前記中央部の接合部分に形成され、
前記傾斜部の車幅内方側の端部は、前記中央部の車幅外方側の端部の上側に差し込まれることを特徴とする請求項２または３に記載の車体構造。 The inclined part and the central part are composed of separate parts,
The fragile portion is formed at a joint portion between the inclined portion and the central portion,
4. The vehicle body structure according to claim 2, wherein an end portion on the vehicle width inward side of the inclined portion is inserted above an end portion on the vehicle width outward side of the central portion. 前記傾斜部から前記中央部に沿って車幅内方側に延びて、前記傾斜部と前記中央部との間のコーナー部を補強する補強部材を設けたことを特徴とする請求項２から４のいずれか１項に記載の車体構造。   5. A reinforcing member that extends from the inclined portion toward the vehicle width inward side along the central portion and reinforces a corner portion between the inclined portion and the central portion is provided. The vehicle body structure according to any one of the above. 前記補強部材は前記脆弱部よりも車幅内方側に延びていることを特徴とする請求項５に記載の車体構造。   The vehicle body structure according to claim 5, wherein the reinforcing member extends inwardly of the vehicle width from the fragile portion. 前記サイドフレームから前記第１の機能部品の上方に突出し車幅方向に延びるアッパクロスメンバを備え、
前記アッパクロスメンバは、前記サイドフレームの上面部の車幅外方側に取り付けられることを特徴とする請求項１から６のいずれか１項に記載の車体構造。 An upper cross member that protrudes upward from the side frame above the first functional component and extends in the vehicle width direction;
The vehicle body structure according to any one of claims 1 to 6, wherein the upper cross member is attached to a vehicle width outward side of an upper surface portion of the side frame. 前記サイドフレームの車幅外方側に設けられたサイドシルと、
前記サイドシルと前記サイドフレームの間に設けられるアウトリガと、を備え、
前記延長部は、前記アウトリガの下面部との間で閉断面を形成し、
前記閉断面は、車体外方側に向かうほど断面積が小さくなるように形成されることを特徴とする請求項１から７のいずれか１項に記載の車体構造。 A side sill provided on the lateral width side of the side frame;
An outrigger provided between the side sill and the side frame,
The extension portion forms a closed cross section with the lower surface portion of the outrigger,
The vehicle body structure according to any one of claims 1 to 7, wherein the closed cross-section is formed so that a cross-sectional area decreases toward an outer side of the vehicle body. 前記クロスメンバにおける前記脆弱部が設けられる部位の断面積は、前記延長部より車幅内方側であって前記脆弱部より車幅外方側の部位の断面積および前記脆弱部より車幅内方側の部位の断面積よりも小さいことを特徴とする請求項１から８のいずれか１項に記載の車体構造。   The cross-sectional area of the cross member where the fragile portion is provided is the cross-sectional area of the portion on the vehicle width inner side from the extension portion and the vehicle width outward side of the fragile portion, and the cross-sectional area of the cross member within the vehicle width from the fragile portion The vehicle body structure according to any one of claims 1 to 8, wherein the vehicle body structure is smaller than a cross-sectional area of a side portion. 前記クロスメンバは、前記傾斜部から車幅外方側に向かって水平に延びる水平部を備え、
前記水平部の下方かつ前記傾斜部の下端部よりも上方に第２の機能部品が配置されることを特徴とする請求項２から６のいずれか１項に記載の車体構造。 The cross member includes a horizontal portion that extends horizontally from the inclined portion toward the outer side of the vehicle width,
The vehicle body structure according to any one of claims 2 to 6, wherein a second functional component is disposed below the horizontal portion and above a lower end portion of the inclined portion. 前記第２の機能部品は、下方から上方向への差し込みによって前記水平部に取り付けられることを特徴とする請求項１０に記載の車体構造。   The vehicle body structure according to claim 10, wherein the second functional component is attached to the horizontal portion by insertion from below to above.
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