JP7465456B2 - Vehicle underbody structure - Google Patents

Vehicle underbody structure Download PDF

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Publication number
JP7465456B2
JP7465456B2 JP2022176271A JP2022176271A JP7465456B2 JP 7465456 B2 JP7465456 B2 JP 7465456B2 JP 2022176271 A JP2022176271 A JP 2022176271A JP 2022176271 A JP2022176271 A JP 2022176271A JP 7465456 B2 JP7465456 B2 JP 7465456B2
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Prior art keywords
cross
width direction
vehicle
vehicle width
fixing
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JP2023011826A (en
Inventor
桂介 河合
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Suzuki Motor Corp
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Suzuki Motor Corp
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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
    • B62D25/2009—Floors or bottom sub-units in connection with other superstructure subunits
    • B62D25/2036—Floors or bottom sub-units in connection with other superstructure subunits the subunits being side panels, sills or pillars
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K1/00—Arrangement or mounting of electrical propulsion units
    • B60K1/04—Arrangement or mounting of electrical propulsion units of the electric storage means for propulsion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K1/00—Arrangement or mounting of electrical propulsion units
    • B60K1/04—Arrangement or mounting of electrical propulsion units of the electric storage means for propulsion
    • B60K2001/0405—Arrangement or mounting of electrical propulsion units of the electric storage means for propulsion characterised by their position
    • B60K2001/0438—Arrangement under the floor

Description

本発明は、車両下部構造に関する。 The present invention relates to a vehicle undercarriage.

電気自動車やハイブリッド自動車等の車両では、駆動用バッテリなどの電源部材が搭載
されており、該電源部材は、レイアウトの都合上、車体フロアの下方などの車両下部に設
けられている。そのため、電気自動車やハイブリッド自動車等においては、特に車両側突
時の衝撃荷重に対する電源部材の破損を避ける措置を施す必要がある。
そこで、従来の車両の中には、電池を支持するバッテリフレーム（クロスメンバ）をア
ンダーメンバ（サイドメンバ）に固定するフランジ部に延性部材を設けることにより、側
突時の衝撃荷重が加わった場合に、バッテリフレームのフランジ部から底部までの破損を
抑制する構造が取られているものがある（例えば、特許文献１参照）。 Vehicles such as electric vehicles and hybrid vehicles are equipped with power supply components such as a drive battery, and for layout reasons, the power supply components are provided under the vehicle, such as below the vehicle floor. Therefore, in electric vehicles, hybrid vehicles, and the like, it is necessary to take measures to prevent damage to the power supply components due to impact loads, particularly in the event of a side collision.
Therefore, some conventional vehicles have a structure in which a ductile member is provided in the flange portion that fixes the battery frame (cross member) that supports the battery to the under member (side member), thereby suppressing damage from the flange portion to the bottom of the battery frame in the event of an impact load being applied during a side collision (see, for example, Patent Document 1).

特開２０１４－８０１１７号公報JP 2014-80117 A

しかしながら、上述した従来の車両下部構造は、側突時にバッテリフレームのフランジ
部から底部までを屈曲変形させる構造であるので、十分な荷重分散や荷重吸収を行うこと
ができず、衝突物の車両内側への侵入量を増加させるおそれがあった。そのため、従来の
車両下部構造は、重要部品である電源部材の破損を抑制する構造として改善する余地があ
った。 However, the above-mentioned conventional vehicle underbody structure is structured to bend and deform the battery frame from the flange to the bottom during a side collision, so it cannot sufficiently distribute or absorb load and there is a risk of increasing the amount of intrusion of the colliding object into the inside of the vehicle. Therefore, the conventional vehicle underbody structure has room for improvement in terms of a structure that suppresses damage to the power supply member, which is an important component.

本発明はこのような実状に鑑みてなされたものであって、その目的は、側突時の衝撃荷重を効率良くクロスメンバに伝達して分散させ、クロスメンバの屈曲変形を抑制することが可能な車両下部構造を提供することにある。
 The present invention has been made in consideration of the above-mentioned circumstances, and its purpose is to provide a vehicle undercarriage structure that can efficiently transmit and distribute impact loads during a side collision to a cross member and suppress bending deformation of the cross member.

上記従来技術の有する課題を解決するために、本発明は、フロアパネルの下面の車両幅方向側部に設けられ、車両前後方向に延びる左右一対のサイドメンバと、該左右一対のサイドメンバ間に設けられる電源部材と、車両幅方向に延び、前記左右一対のサイドメンバを連結するクロスメンバとを備え、前記クロスメンバは、前記電源部材が固定される閉断面構造を備え、前記サイドメンバに固定されている車両下部構造において、前記サイドメンバと前記クロスメンバとは、ブラケット部材を介して固定され、前記クロスメンバは、車両幅方向内側へ向かって湾曲する湾曲部を有し、該湾曲部は、前記サイドメンバと前記クロスメンバとを締結する締結ボルトの車両幅方向内側で前記ブラケット部材と車両幅方向で重なる位置に配置され、前記ブラケット部材は、車両幅方向内側の位置で前記ブラケット部材の下面が前記クロスメンバに固定されるクロスメンバ側固定部と、前記サイドメンバの下面に固定されるサイドメンバ側固定部と、該サイドメンバ側固定部の車両幅方向内側端部から前記クロスメンバ側固定部まで延び、車両幅方向内側へ向かって下方に傾斜する傾斜面とを有している。
 In order to solve the problems associated with the above-described conventional technology, the present invention provides a vehicle undercarriage structure comprising a pair of left and right side members provided on the vehicle width direction sides of the underside of a floor panel and extending in the front-rear direction of the vehicle, a power supply member provided between the pair of left and right side members, and a cross member extending in the vehicle width direction and connecting the pair of left and right side members, wherein the cross member has a closed cross-sectional structure to which the power supply member is fixed, and is fixed to the side members, the side members and the cross member are fixed via bracket members, the cross member has a curved portion that curves toward the inside in the vehicle width direction , and the curved portion is arranged at a position where it overlaps with the bracket member in the vehicle width direction on the inside in the vehicle width direction of a fastening bolt that fastens the side member and the cross member, and the bracket member has a cross member side fixing portion at which a lower surface of the bracket member is fixed to the cross member at a position on the inside in the vehicle width direction, a side member side fixing portion fixed to the underside of the side member, and an inclined surface that extends from the vehicle width direction inner end of the side member side fixing portion to the cross member side fixing portion and inclined downward toward the inside in the vehicle width direction .

本発明の車両下部構造においては、車両幅方向の荷重がサイドメンバからブラケット部材を介してクロスメンバに効率良く伝達されて分散されることになるので、重要部品である電源部材を側突時の衝撃荷重から効果的に保護することができる。 In the vehicle underbody structure of the present invention, the load in the vehicle width direction is efficiently transmitted and distributed from the side member to the cross member via the bracket member, thereby effectively protecting the power supply member, which is an important component, from the impact load in the event of a side collision.

本発明の実施形態に係る車両下部構造において、フロアパネル、サイドメンバ及びクロスメンバ等の全体を車両下方から示す斜視図である。1 is a perspective view showing an entire vehicle underbody structure including a floor panel, a side member, a cross member, etc., from below the vehicle according to an embodiment of the present invention. 図１におけるＺ部を拡大して示す斜視図である。FIG. 2 is an enlarged perspective view showing a portion Z in FIG. 1 . 図２におけるＡ－Ａ線断面図である。3 is a cross-sectional view taken along line AA in FIG. 2. 図２におけるＢ－Ｂ線断面斜視図である。3 is a cross-sectional perspective view taken along line BB in FIG. 2. 図２におけるＣ－Ｃ線断面図である。3 is a cross-sectional view taken along line CC in FIG. 2. 本発明の実施形態に係る車両下部構造において、クロスメンバ、ブラケット部材及び固定補助部材の位置関係を示す斜視図である。2 is a perspective view showing the positional relationship between a cross member, a bracket member, and a fixing auxiliary member in the vehicle underbody structure according to the embodiment of the present invention. FIG. 本発明の実施形態に係る車両下部構造におけるブラケット部材を上方から見た平面図である。2 is a plan view of a bracket member in the vehicle underbody structure according to the embodiment of the present invention, as viewed from above. FIG.

以下、本発明を図示の実施の形態に基づいて詳細に説明する。
なお、図において、矢印Ｆｒ方向は車両前方を示し、矢印Ｉ方向は車両幅方向内側を示
している。また、矢印Ｘ方向は車両幅方向を示し、矢印Ｙ方向は車両前後方向を示してい
る。 Hereinafter, the present invention will be described in detail based on the illustrated embodiments.
In the drawings, the arrow Fr direction indicates the front of the vehicle, the arrow I direction indicates the inside in the vehicle width direction, the arrow X direction indicates the vehicle width direction, and the arrow Y direction indicates the vehicle front-rear direction.

図１～図７は本発明の実施形態に係る車両下部構造を示すものである。本実施形態の車
両下部構造は、図１～図５に示すように、車両幅方向及び車両前後方向に展開するフロア
パネル１の下面の車両幅方向側部に設けられ、車両前後方向に延びる左右一対のサイドメ
ンバ２と、これら左右一対のサイドメンバ２間に設けられ、フロアパネル１の下方に搭載
される電源部材（駆動用バッテリ、電池パック等）３と、車両幅方向に延び、左右一対の
サイドメンバ２を連結する複数本のクロスメンバ４とを備えており、該クロスメンバ４は
、電源部材３の車両下方に位置し、車両前後方向に間隔を空けて配置されている。なお、
サイドメンバ２の車両幅方向外側には、車両前後方向に延びる左右一対のサイドシル５が
設けられている。
本実施形態のクロスメンバ４は、電源部材３が固定部Ｄで固定される閉断面構造の本体
部４１と、サイドメンバ２に固定されるフランジ部４２を有している。本体部４１は、ク
ロスメンバ４の車両幅方向の中間部分に位置しており、上下に間隔を空けて配置される上
下一対のメンバ体４１ａ，４１ｂを有している。フランジ部４２は、クロスメンバ４の車
両幅方向の外側端部に位置しており、車両後方視で本体部４１の車両幅方向外側の開口端
を塞ぐように、上下一対のメンバ体４１ａ，４１ｂに接合されている。 1 to 7 show a vehicle underbody structure according to an embodiment of the present invention. As shown in Figs. 1 to 5, the vehicle underbody structure of this embodiment is provided on the vehicle width lateral sides of the underside of a floor panel 1 that unfolds in the vehicle width direction and the vehicle front-rear direction, and includes a pair of left and right side members 2 extending in the vehicle front-rear direction, a power source member (driving battery, battery pack, etc.) 3 provided between the pair of left and right side members 2 and mounted below the floor panel 1, and a plurality of cross members 4 extending in the vehicle width direction and connecting the pair of left and right side members 2, the cross members 4 being located below the power source members 3 and spaced apart in the vehicle front-rear direction.
A pair of left and right side sills 5 extending in the front-rear direction of the vehicle are provided on outer sides of the side members 2 in the vehicle width direction.
The cross member 4 of this embodiment has a main body portion 41 with a closed cross-sectional structure to which the power supply member 3 is fixed by a fixing portion D, and a flange portion 42 fixed to the side member 2. The main body portion 41 is located in the middle portion of the cross member 4 in the vehicle width direction, and has a pair of upper and lower member bodies 41a, 41b arranged with a gap between them above and below. The flange portion 42 is located at the outer end portion of the cross member 4 in the vehicle width direction, and is joined to the pair of upper and lower member bodies 41a, 41b so as to close the outer open end of the main body portion 41 in the vehicle width direction when viewed from the rear of the vehicle.

本実施形態の車両下部構造においては、図３～図５に示すように、サイドメンバ２とク
ロスメンバ４のフランジ部４２とがブラケット部材６を介して固定されており、これらブ
ラケット部材６とクロスメンバ４とが組み合わされることにより、ブラケット部材６の固
定部周りの剛性を高める閉断面部Ｓ１が形成されている。しかも、この閉断面部Ｓ１は、
車両幅方向でクロスメンバ４の本体部４１とフランジ部４２との境界領域Ｒを跨ぐ位置に
配置されており、この配置によってサイドメンバ２とクロスメンバ４との固定部の応力集
中箇所の位置がずらせるようになっている。また、ブラケット部材６は、車両幅方向内側
の位置でクロスメンバ４の本体部４１に固定されるクロスメンバ側固定部６１を有してい
る。さらに、ブラケット部材６の車両幅方向外側に位置する閉断面部Ｓ１の下方には、図
５に示すように、クロスメンバ４の本体部４１とフランジ部４２とによって形成される端
部閉断面部Ｓ２が設けられ、該端部閉断面部Ｓ２は、閉断面構造の本体部４１の閉断面部
と繋がっており、サイドメンバ２とクロスメンバ４との固定部に加わる荷重の車両幅方向
への伝達が促進されるようになっている。 In the vehicle underbody structure of this embodiment, as shown in Figures 3 to 5, the side member 2 and the flange portion 42 of the cross member 4 are fixed via a bracket member 6, and the bracket member 6 and the cross member 4 are combined to form a closed cross-sectional portion S1 that enhances the rigidity around the fixing portion of the bracket member 6. Moreover, this closed cross-sectional portion S1 is
The bracket member 6 is disposed at a position straddling the boundary region R between the main body portion 41 and the flange portion 42 of the cross member 4 in the vehicle width direction, and this arrangement allows the position of the stress concentration point of the fixing portion between the side member 2 and the cross member 4 to be shifted. The bracket member 6 also has a cross-member side fixing portion 61 that is fixed to the main body portion 41 of the cross member 4 at a position on the inner side in the vehicle width direction. Furthermore, as shown in Fig. 5, an end closed cross-sectional portion S2 formed by the main body portion 41 and the flange portion 42 of the cross member 4 is provided below the closed cross-sectional portion S1 located on the outer side in the vehicle width direction of the bracket member 6, and the end closed cross-sectional portion S2 is connected to the closed cross-sectional portion of the main body portion 41 having a closed cross-sectional structure, so that the transmission of the load applied to the fixing portion between the side member 2 and the cross member 4 in the vehicle width direction is promoted.

本実施形態のブラケット部材６は、図３～図７に示すように、車両上面視で四角形形状
に形成され、サイドメンバ２の下面２ａに固定されるサイドメンバ側固定部６２と、該サ
イドメンバ側固定部６２の車両幅方向内側端部からクロスメンバ側固定部６１まで延び、
車両幅方向内側へ向かって下方に傾斜する傾斜面６３を有している。すなわち、ブラケッ
ト部材６は、板状部材を加工することにより、車両幅方向の内側部分６ａと車両前後方向
の前側部分６ｂ及び後側部分６ｃを残して中央部分が車両上方へ向かって膨出し、車両側
方視で台形形状に形成されており、サイドメンバ側固定部６２を中心として三方が放射線
状に拡がって内側部分６ａ、前側部分６ｂ及び後側部分６ｃの下面が、クロスメンバ４に
接合されるように構成されている。なお、サイドメンバ側固定部６２には、後述の締結ボ
ルトの軸部を挿通させる貫通孔６５が設けられている。
これによって、サイドメンバ２からの荷重がブラケット部材６のサイドメンバ側固定部
６２及び傾斜面６３を介してクロスメンバ４側に円滑に伝達され、局所的な荷重集中が抑
制されるようになっている。 As shown in FIGS. 3 to 7, the bracket member 6 of this embodiment is formed in a quadrangular shape when viewed from above the vehicle, and includes a side-member-side fixing portion 62 that is fixed to the underside 2a of the side member 2, and a cross-member-side fixing portion 61 that extends from an inner end of the side-member-side fixing portion 62 in the vehicle width direction to a cross-member-side fixing portion 61.
The bracket member 6 has an inclined surface 63 that inclines downward toward the inside in the vehicle width direction. That is, the bracket member 6 is formed into a trapezoidal shape as seen from the side of the vehicle by processing a plate-shaped member so that a central portion bulges out toward the upper part of the vehicle, leaving an inner portion 6a in the vehicle width direction and a front portion 6b and a rear portion 6c in the vehicle front-rear direction, and is configured so that the lower surfaces of the inner portion 6a, the front portion 6b and the rear portion 6c are joined to the cross member 4 by expanding radially on three sides with the side-member side fixing portion 62 as the center. The side-member side fixing portion 62 is provided with a through hole 65 through which a shaft portion of a fastening bolt described later is inserted.
This allows the load from the side member 2 to be smoothly transmitted to the cross member 4 side via the side member side fixing portion 62 and the inclined surface 63 of the bracket member 6, thereby suppressing localized load concentration.

また、本実施形態のブラケット部材６の傾斜面６３は、図７に示すように、サイドメン
バ側固定部６２の車両幅方向内側に位置する角部６２ａからクロスメンバ側固定部６１へ
向かって延びる複数本の稜線６４を有している。これら稜線６４は、車両前後方向に間隔
を空けて傾斜面６３の前後部にそれぞれ設けられている。このような稜線６４を傾斜面６
３が有することにより、ブラケット部材６のサイドメンバ側固定部６２から車両幅方向に
入力された荷重が、稜線６４に沿って効率的に伝達され、クロスメンバ側固定部６１より
クロスメンバ４側へ分散され、荷重の局所的集中が抑えられるようになっている。 7, the inclined surface 63 of the bracket member 6 in this embodiment has a plurality of ridge lines 64 extending from a corner 62a located on the inner side in the vehicle width direction of the side member side fixing part 62 toward the cross member side fixing part 61. These ridge lines 64 are provided at the front and rear parts of the inclined surface 63 with a gap therebetween in the vehicle front-rear direction.
By having such a structure, the load input in the vehicle width direction from the side member side fixing portion 62 of the bracket member 6 is efficiently transmitted along the ridge line 64 and dispersed to the cross member 4 side from the cross member side fixing portion 61, thereby suppressing local concentration of the load.

一方、本実施形態のクロスメンバ４は、図２及び図３に示すように、本体部４１とフラ
ンジ部４２との境界領域Ｒにおいて、車両幅方向内側へ向かって湾曲する湾曲部４３を有
している。すなわち、湾曲部４３は、クロスメンバ４の上側に位置するフランジ部４２か
ら本体部４１の下側メンバ体４１ｂへ向かって車両幅方向内側へ湾曲した横置きの略Ｓ字
形状に形成されており、湾曲部４３の周辺部は、本体部４１の下側メンバ体４１ｂに接合
されている。このような形状の湾曲部４３によって、ブラケット部材６側の閉断面部Ｓ１
とクロスメンバ４の本体部４１が有する閉断面部を合わせた合計閉断面部の断面積変化を
減らし、合計閉断面部の面積を維持する構造が得られることになる。
ところで、クロスメンバ４の湾曲部４３は、車両上下方向の荷重に対して剛性を有して
いる。そのため、当該湾曲部４３は、ブラケット部材６の傾斜面６３と車両幅方向で重な
る位置に配置されている。これに伴い、湾曲部４３と本体部４１とが接合される部分に荷
重が集中して変形が生じる場合に、湾曲部４３が傾斜面６３の範囲内に配置されているこ
とから、傾斜面６３に荷重が伝達され、当該湾曲部４３への荷重集中が防げる構造になっ
ている。 2 and 3, the cross member 4 of this embodiment has a curved portion 43 that curves inward in the vehicle width direction in the boundary region R between the main body portion 41 and the flange portion 42. That is, the curved portion 43 is formed in a horizontally placed, generally S-shape that curves inward in the vehicle width direction from the flange portion 42 located on the upper side of the cross member 4 toward the lower member body 41b of the main body portion 41, and the peripheral portion of the curved portion 43 is joined to the lower member body 41b of the main body portion 41. The curved portion 43 having such a shape defines the closed cross-sectional portion S1 on the bracket member 6 side.
This reduces the change in cross-sectional area of the total closed cross-sectional area, which is the combined closed cross-sectional area of the main body 41 of the cross member 4, and thereby obtains a structure that maintains the area of the total closed cross-sectional area.
Incidentally, the curved portion 43 of the cross member 4 has rigidity against loads in the vertical direction of the vehicle. Therefore, the curved portion 43 is disposed at a position overlapping with the inclined surface 63 of the bracket member 6 in the vehicle width direction. Accordingly, in the case where a load is concentrated at the portion where the curved portion 43 and the main body portion 41 are joined, causing deformation, since the curved portion 43 is disposed within the range of the inclined surface 63, the load is transmitted to the inclined surface 63, and the structure is such that the load concentration on the curved portion 43 can be prevented.

本実施形態のサイドメンバ２は、図３～図５に示すように、平面状の下面２ａと、該下
面２ａの車両幅方向の内側及び外側に位置し、車両上方へ向かって延びる左右両側壁２ｂ
，２ｃとを有する断面略Ｕ字状に形成されている。サイドメンバ２の内部には、サイドメ
ンバ２とクロスメンバ４を固定する円筒形の固定部材７と、サイドメンバ２の左右両側壁
２ｂ，２ｃを連結するリンフォースメント２１が設けられている。そのため、固定部材７
の内周面には、サイドメンバ２とクロスメンバ４とを締結する締結ボルト８の軸部の雄ね
じと螺合する雌ねじが形成されている。また、リンフォースメント２１は、サイドメンバ
２の下面２ａの上方に位置し、該下面２ａに対して間隔を空けて配置される取付面２１ａ
と、サイドメンバ２の左右両側壁２ｂ，２ｃに接合される側面２１ｂ，２１ｃとを有して
おり、取付面２１ａには、固定部材７の上部を挿入する取付孔２１ｄが設けられている。
なお、サイドメンバ２の下面２ａと、クロスメンバ４の本体部４１及びフランジ部４２に
は、ブラケット部材６の貫通孔６５及びリンフォースメント２１の取付孔２１ｄと対応し
て、締結ボルト８の軸部を挿通させる挿通孔２ｄ，４１ｃ，４２ａが設けられている。
固定部材７は、円筒体の上端に位置する小径の上部７ａと、円筒体の下端に位置する大
径の下部７ｂと、円筒体の上下中間に位置し、上下部７ａ，７ｃの間の径で形成された中
間部７ｃとを有しており、固定部材７の上下長さは、サイドメンバ２の下面２ａとリンフ
ォースメント２１の取付面２１ａとの間隔よりも少し大きく形成されている。固定部材７
の上部７ａは、取付孔２１ｄを介して取付面２１ａの上方に突出され、中間部７ｃが取付
面２１ａの下面に当接した状態でリンフォースメント２１に接合されている。固定部材７
の下部７ｂは、サイドメンバ２の下面２ａの上に接合されている。
これにより、サイドメンバ２の右側側壁２ｃに入力される車両幅方向の荷重がリンフォ
ースメント２１及び固定部材７を介してクロスメンバ４に伝達されることになり、荷重の
伝達及び分散が促進されるような構造になっている。 As shown in FIGS. 3 to 5, the side member 2 of this embodiment has a flat lower surface 2a and left and right side walls 2b located on the inside and outside of the lower surface 2a in the vehicle width direction and extending toward the upper part of the vehicle.
, 2c. Inside the side member 2, a cylindrical fixing member 7 for fixing the side member 2 and the cross member 4, and a reinforcement 21 for connecting both the left and right side walls 2b, 2c of the side member 2 are provided.
The inner peripheral surface of the reinforcement 21 is formed with a female thread that screws into a male thread of a shaft of a fastening bolt 8 that fastens the side member 2 and the cross member 4. The reinforcement 21 is located above the lower surface 2a of the side member 2 and has a mounting surface 21a that is spaced apart from the lower surface 2a.
and side surfaces 21b, 21c joined to the left and right side walls 2b, 2c of the side member 2, and the mounting surface 21a is provided with a mounting hole 21d into which the upper part of the fixing member 7 is inserted.
In addition, the underside 2a of the side member 2 and the main body portion 41 and flange portion 42 of the cross member 4 are provided with insertion holes 2d, 41c, 42a corresponding to the through hole 65 of the bracket member 6 and the mounting hole 21d of the reinforcement 21, through which the shaft portion of the fastening bolt 8 is inserted.
The fixing member 7 has a small-diameter upper portion 7a located at the upper end of the cylinder, a large-diameter lower portion 7b located at the lower end of the cylinder, and an intermediate portion 7c located in the upper and lower middle of the cylinder and formed with a diameter between the upper and lower portions 7a and 7c. The vertical length of the fixing member 7 is formed to be slightly larger than the distance between the lower surface 2a of the side member 2 and the mounting surface 21a of the reinforcement 21.
The upper portion 7a of the fixing member 7 protrudes above the mounting surface 21a through the mounting hole 21d, and the middle portion 7c is joined to the reinforcement 21 in a state where it abuts against the lower surface of the mounting surface 21a.
The lower portion 7 b of the side member 2 is joined onto the lower surface 2 a of the side member 2 .
As a result, the load in the vehicle width direction input to the right side wall 2c of the side member 2 is transmitted to the cross member 4 via the reinforcement 21 and the fixing member 7, thereby promoting the transmission and distribution of the load.

さらに、本実施形態のブラケット部材６とクロスメンバ４のフランジ部４２との間には
、図３、図５及び図６に示すように、サイドメンバ２とクロスメンバ４との固定を補助す
る円筒形の固定補助部材９が設けられている。そのため、固定補助部材９は、ブラケット
部材６のサイドメンバ側固定部６２と、クロスメンバ４の本体部４１の上側メンバ体４１
ａとの上下間に配置可能で、かつ円筒体の上下面がサイドメンバ側固定部６２及び上側メ
ンバ体４１ａと当接可能な上下長さを有している。また、固定補助部材９は、締結ボルト
８を挿通させることが可能な内径を有している。しかも、固定部材７及び固定補助部材９
は、締結ボルト８により締結されており、締結ボルト８の車両幅方向の剛性を利用できる
構造を有している。
これにより、サイドメンバ２から入力される荷重が固定補助部材９を介してクロスメン
バ４に伝達されることになり、荷重の分散がさらに促進されるようになっている。 3, 5 and 6, a cylindrical auxiliary fixing member 9 that assists in fixing the side member 2 to the cross member 4 is provided between the bracket member 6 and the flange portion 42 of the cross member 4 in this embodiment.
a and has a vertical length that allows the upper and lower surfaces of the cylindrical body to abut against the side member side fixing portion 62 and the upper member body 41 a. The fixing auxiliary member 9 has an inner diameter that allows the fastening bolt 8 to be inserted therethrough.
are fastened by fastening bolts 8, and have a structure that can utilize the rigidity of the fastening bolts 8 in the vehicle width direction.
As a result, the load input from the side member 2 is transmitted to the cross member 4 via the auxiliary fixing member 9, further facilitating distribution of the load.

このように、本発明の実施形態に係る車両下部構造では、フロアパネル１の下面の車両
幅方向側部に設けられ、車両前後方向に延びる左右一対のサイドメンバ２と、左右一対の
サイドメンバ２間に設けられる電源部材３と、車両幅方向に延び、前記左右一対のサイド
メンバ２を連結するクロスメンバ４とを備えている。クロスメンバ４は、電源部材３が固
定される閉断面構造の本体部４１と、サイドメンバ２に固定されるフランジ部４２を有し
ている。そして、サイドメンバ２とフランジ部４２とは、ブラケット部材６を介して固定
されるとともに、ブラケット部材６とクロスメンバ４とが組み合わされることにより閉断
面部Ｓ１が形成され、閉断面部Ｓ１は、車両幅方向で本体部４１とフランジ部４２との境
界領域Ｒを跨ぐ位置に配置されている。また、ブラケット部材６は、車両幅方向内側の位
置でクロスメンバ４に固定されるクロスメンバ側固定部６１を有している。
すなわち、本実施形態の車両下部構造においては、クロスメンバ４と組み合わされて特
定の位置に閉断面部Ｓ１を形成するブラケット部材６が設けられているので、側突時に車
両外側からサイドメンバ２に加わる衝撃荷重を吸収することが可能となり、車両外側から
の荷重に対して、クロスメンバ４の本体部４１とフランジ部４２との間の屈曲変形や折れ
を抑制することができる。それに加えて、本実施形態の車両下部構造では、車両幅方向の
荷重がサイドメンバ２からブラケット部材６を介してクロスメンバ４に効率良く伝達され
て分散されることになるので、重要部品である電源部材３を側突時の衝撃荷重から効果的
に保護することができる。 As described above, the vehicle underbody structure according to the embodiment of the present invention includes a pair of left and right side members 2 provided on the vehicle width direction sides of the lower surface of the floor panel 1 and extending in the vehicle front-rear direction, a power supply member 3 provided between the pair of left and right side members 2, and a cross member 4 extending in the vehicle width direction and connecting the pair of left and right side members 2. The cross member 4 has a main body portion 41 having a closed cross-sectional structure to which the power supply member 3 is fixed, and a flange portion 42 fixed to the side member 2. The side member 2 and the flange portion 42 are fixed via the bracket member 6, and the bracket member 6 and the cross member 4 are combined to form a closed cross-sectional portion S1, which is disposed at a position straddling a boundary region R between the main body portion 41 and the flange portion 42 in the vehicle width direction. The bracket member 6 also has a cross-member side fixing portion 61 fixed to the cross member 4 at a position on the inner side in the vehicle width direction.
That is, in the vehicle underbody structure of this embodiment, the bracket member 6 is provided which is combined with the cross member 4 to form the closed cross-sectional portion S1 at a specific position, making it possible to absorb the impact load applied to the side member 2 from the outside of the vehicle during a side collision, and suppress bending deformation or breaking between the main body portion 41 and the flange portion 42 of the cross member 4 due to the load from the outside of the vehicle. In addition, in the vehicle underbody structure of this embodiment, the load in the vehicle width direction is efficiently transmitted and distributed from the side member 2 to the cross member 4 via the bracket member 6, making it possible to effectively protect the power supply member 3, which is an important component, from the impact load during a side collision.

また、本実施形態の車両下部構造において、ブラケット部材６は、サイドメンバ２の下
面２ａに固定されるサイドメンバ側固定部６２と、サイドメンバ側固定部６２の車両幅方
向内側端部からクロスメンバ側固定部６１まで延び、車両幅方向内側へ向かって下方に傾
斜する傾斜面６３を有している。
したがって、本実施形態の車両下部構造によれば、側突時にサイドメンバ２からの荷重
がブラケット部材６のサイドメンバ側固定部６２及び傾斜面６３を介してクロスメンバ４
側に伝達されることになるので、局所的な荷重集中を抑制し、クロスメンバ４の屈曲変形
を抑えることができる。これにより、側突時の衝撃荷重に対する電源部材３の保護効果を
更に高めることができる。 Furthermore, in the vehicle undercarriage structure of this embodiment, the bracket member 6 has a side-member side fixing portion 62 that is fixed to the underside 2a of the side member 2, and an inclined surface 63 that extends from the vehicle width direction inner end of the side-member side fixing portion 62 to the cross-member side fixing portion 61 and inclines downward toward the inside in the vehicle width direction.
Therefore, according to the vehicle underbody structure of this embodiment, in the event of a side collision, the load from the side member 2 is transferred to the cross member 4 via the side member side fixing portion 62 and the inclined surface 63 of the bracket member 6.
Since the load is transmitted to the side, it is possible to suppress localized load concentration and suppress bending deformation of the cross member 4. This makes it possible to further enhance the protective effect of the power supply member 3 against the impact load during a side collision.

そして、本実施形態の車両下部構造において、傾斜面６３は、サイドメンバ側固定部６
２からクロスメンバ側固定部６１へ向かって延びる稜線６４を有し、稜線６４は、車両前
後方向に間隔を空けて傾斜面６３の前後部に設けられている。したがって、本実施形態の
車両下部構造によれば、側突時に、ブラケット部材６のサイドメンバ側固定部６２から車
両幅方向に入力された荷重が、稜線６４に沿って伝達され、クロスメンバ側固定部６１よ
りクロスメンバ４側へ分散されることになるので、荷重の局所的集中をより一層抑側する
ことができる。 In the vehicle underbody structure of the present embodiment, the inclined surface 63 is
2 toward the cross member side fixing part 61, and the ridge lines 64 are provided at the front and rear of the inclined surface 63 with a gap therebetween in the vehicle longitudinal direction. Therefore, according to the vehicle undercarriage structure of this embodiment, in the event of a side collision, the load input in the vehicle width direction from the side member side fixing part 62 of the bracket member 6 is transmitted along the ridge line 64 and dispersed to the cross member 4 side by the cross member side fixing part 61, thereby further suppressing local concentration of the load.

さらに、本実施形態の車両下部構造において、クロスメンバ４は、本体部４１とフラン
ジ部４２との境界領域Ｒにおいて、車両幅方向内側へ向かって湾曲する湾曲部４３を有し
ている。この湾曲部４３は、傾斜面６３と車両幅方向で重なる位置に配置されている。し
たがって、本実施形態の車両下部構造では、ブラケット部材６により形成される閉断面部
Ｓ１とクロスメンバ４の本体部４１が有する閉断面部を合わせた合計閉断面部の断面積変
化を減らすことが可能になるので、湾曲部４３への荷重集中を防止することができる。 Furthermore, in the vehicle underbody structure of this embodiment, the cross member 4 has a curved portion 43 that curves inward in the vehicle width direction in the boundary region R between the main body portion 41 and the flange portion 42. This curved portion 43 is disposed at a position that overlaps with the inclined surface 63 in the vehicle width direction. Therefore, in the vehicle underbody structure of this embodiment, it is possible to reduce the change in cross-sectional area of the total closed cross-sectional portion that combines the closed cross-sectional portion S1 formed by the bracket member 6 and the closed cross-sectional portion of the main body portion 41 of the cross member 4, thereby preventing load concentration on the curved portion 43.

そして、本実施形態の車両下部構造において、サイドメンバ２は、断面略Ｕ字状に形成
されており、サイドメンバ２の内部には、サイドメンバ２とクロスメンバ４を固定する固
定部材７と、サイドメンバ２の左右両側壁２ｂ，２ｃを連結するリンフォースメント２１
が設けられている。固定部材７の上部７ａは、リンフォースメント２１に接合され、固定
部材７の下部７ｂは、サイドメンバ２の下面２ａに接合されている。
したがって、本実施形態の車両下部構造では、サイドメンバ２の下面２ａとリンフォー
スメント２１に対して車両幅方向より荷重が入力されると、固定部材７がリンフォースメ
ント２１及びサイドメンバ２との接合部で当該車両幅方向の荷重を受けることになるので
、固定部材７の車両幅方向剛性を利用することができる。しかも、本実施形態の車両下部
構造においては、サイドメンバ２の車両幅方向外側の右側側壁２ｃに入力される車両幅方
向の荷重がリンフォースメント２１及び固定部材７を介してクロスメンバ４に伝達される
ことになるので、車両幅方向の荷重伝達を促進することができ、側突時の衝撃荷重をクロ
スメンバ４などに円滑に分散させることができる。 In the vehicle lower structure of this embodiment, the side member 2 is formed to have a substantially U-shaped cross section, and the side member 2 is provided therein with a fixing member 7 for fixing the side member 2 and the cross member 4, and a reinforcement 21 for connecting both left and right side walls 2b, 2c of the side member 2.
An upper portion 7 a of the fixing member 7 is joined to the reinforcement 21 , and a lower portion 7 b of the fixing member 7 is joined to the lower surface 2 a of the side member 2 .
Therefore, in the vehicle underbody structure of this embodiment, when a load is input from the vehicle width direction to the underside 2a of the side member 2 and the reinforcement 21, the fixed member 7 receives the load in the vehicle width direction at the joint between the reinforcement 21 and the side member 2, so that it is possible to utilize the rigidity in the vehicle width direction of the fixed member 7. Moreover, in the vehicle underbody structure of this embodiment, the load in the vehicle width direction input to the right side wall 2c on the outer side of the side member 2 in the vehicle width direction is transmitted to the cross member 4 via the reinforcement 21 and the fixed member 7, so that it is possible to promote the transmission of the load in the vehicle width direction and to smoothly distribute the impact load in the event of a side collision to the cross member 4, etc.

また、本実施形態の車両下部構造において、ブラケット部材６とフランジ部４２との間
には、サイドメンバ２とクロスメンバ４との固定を補助する固定補助部材９が設けられて
いるので、サイドメンバ２から入力される荷重を、固定補助部材９を介してクロスメンバ
４に円滑に伝達することができ、荷重の分散効果をさらに高めることができる。 Furthermore, in the vehicle lower structure of this embodiment, a fixing auxiliary member 9 that assists in fixing the side member 2 and the cross member 4 is provided between the bracket member 6 and the flange portion 42, so that the load input from the side member 2 can be smoothly transmitted to the cross member 4 via the fixing auxiliary member 9, further enhancing the load distribution effect.

以上、本発明の実施の形態につき述べたが、本発明は既述の実施の形態に限定されるも
のではなく、本発明の技術的思想に基づいて各種の変形及び変更が可能である。 Although the embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and various modifications and changes can be made based on the technical concept of the present invention.

１ フロアパネル
２ サイドメンバ
２ａ 下面
２ｂ，２ｃ 側壁
２ｄ 挿通孔
３ 電源部材
４ クロスメンバ
６ ブラケット部材
７ 固定部材
７ａ 上部
７ｂ 下部
７ｃ 中間部
８ 締結ボルト
９ 固定補助部材
２１ リンフォースメント
２１ａ 取付面
２１ｂ，２１ｃ 側面
２１ｄ 取付孔
４１ クロスメンバの本体部
４１ａ 上側メンバ体
４１ｂ 下側メンバ体
４１ｃ 挿通孔
４２ クロスメンバのフランジ部
４２ａ 挿通孔
４３ 湾曲部
６１ クロスメンバ側固定部
６２ サイドメンバ側固定部
６３ 傾斜面
６４ 稜線
６５ 貫通孔
Ｒ クロスメンバの本体部とフランジ部との境界領域
Ｓ１ 閉断面部 REFERENCE SIGNS LIST 1 floor panel 2 side member 2a lower surface 2b, 2c side wall 2d insertion hole 3 power supply member 4 cross member 6 bracket member 7 fixing member 7a upper portion 7b lower portion 7c middle portion 8 fastening bolt 9 fixing auxiliary member 21 reinforcement 21a mounting surface 21b, 21c side surface 21d mounting hole 41 main body portion of cross member 41a upper member body 41b lower member body 41c insertion hole 42 flange portion of cross member 42a insertion hole 43 curved portion 61 cross member side fixing portion 62 side member side fixing portion 63 inclined surface 64 ridge line 65 through hole R boundary region between main body portion and flange portion of cross member S1 closed cross section portion

Claims (5)

フロアパネルの下面の車両幅方向側部に設けられ、車両前後方向に延びる左右一対のサイドメンバと、該左右一対のサイドメンバ間に設けられる電源部材と、車両幅方向に延び、前記左右一対のサイドメンバを連結するクロスメンバとを備え、
前記クロスメンバは、前記電源部材が固定される閉断面構造を備え、前記サイドメンバに固定されている車両下部構造において、
前記サイドメンバと前記クロスメンバとは、ブラケット部材を介して固定され、
前記クロスメンバは、車両幅方向内側へ向かって湾曲する湾曲部を有し、該湾曲部は、前記サイドメンバと前記クロスメンバとを締結する締結ボルトの車両幅方向内側で前記ブラケット部材と車両幅方向で重なる位置に配置され、
前記ブラケット部材は、
車両幅方向内側の位置で前記ブラケット部材の下面が前記クロスメンバに固定されるクロスメンバ側固定部と、
前記サイドメンバの下面に固定されるサイドメンバ側固定部と、
該サイドメンバ側固定部の車両幅方向内側端部から前記クロスメンバ側固定部まで延び、車両幅方向内側へ向かって下方に傾斜する傾斜面とを有していることを特徴とする車両下部構造。 a pair of left and right side members provided on vehicle width direction sides of a lower surface of a floor panel and extending in a vehicle front-rear direction, a power supply member provided between the pair of left and right side members, and a cross member extending in the vehicle width direction and connecting the pair of left and right side members,
The cross member has a closed cross-sectional structure to which the power supply member is fixed, and is fixed to the side member.
The side members and the cross members are fixed to each other via bracket members,
the cross member has a curved portion curved toward the inside in the vehicle width direction, the curved portion being disposed at a position overlapping with the bracket member in the vehicle width direction on the inside in the vehicle width direction of a fastening bolt that fastens the side member and the cross member ,
The bracket member is
a cross member side fixing portion at which a lower surface of the bracket member is fixed to the cross member at a position on the inner side in the vehicle width direction;
A side member side fixing portion fixed to a lower surface of the side member;
a side member side fixing portion that is inclined downward toward the inside in the vehicle width direction and extends from the inner end of the side member side fixing portion to the cross member side fixing portion, the side member side fixing portion being inclined downward toward the inside in the vehicle width direction . 前記傾斜面は、前記サイドメンバ側固定部から前記クロスメンバへ向かって延びる稜線を有し、該稜線は、車両前後方向に間隔を空けて前記傾斜面の前後部に設けられていることを特徴とする請求項１に記載の車両下部構造。 2. The vehicle undercarriage structure according to claim 1, wherein the inclined surface has a ridge line extending from the side member side fixing portion toward the cross member, the ridge lines being provided at the front and rear portions of the inclined surface with a gap therebetween in the fore-and-aft direction of the vehicle. 前記クロスメンバは、前記電源部材が固定される閉断面構造の本体部と、前記サイドメンバに固定されるフランジ部を有し、
前記ブラケット部材と前記クロスメンバとが組み合わされることにより閉断面部が形成され、
前記閉断面部は、車両幅方向で前記本体部と前記フランジ部との境界領域を跨ぐ位置に配置されていることを特徴とする請求項１または２に記載の車両下部構造。 the cross member has a main body portion having a closed cross-sectional structure to which the power supply member is fixed, and a flange portion fixed to the side member,
A closed cross-sectional portion is formed by combining the bracket member and the cross member,
3. The vehicle underbody structure according to claim 1 , wherein the closed cross-sectional portion is disposed at a position straddling a boundary area between the main body portion and the flange portion in a vehicle width direction. 前記サイドメンバは、断面略Ｕ字状に形成され、前記サイドメンバの内部には、前記サイドメンバと前記クロスメンバを固定する固定部材と、前記サイドメンバの左右両側壁を連結するリンフォースメントが設けられ、前記固定部材の上部は、前記リンフォースメントに接合され、前記固定部材の下部は、前記サイドメンバの下面に接合されていることを特徴とする請求項１～３のいずれかに記載の車両下部構造。 The vehicle undercarriage structure according to any one of claims 1 to 3, characterized in that the side member is formed with a generally U-shaped cross section, and a fixing member for fixing the side member and the cross member and a reinforcement for connecting both left and right side walls of the side member are provided inside the side member, and an upper part of the fixing member is joined to the reinforcement, and a lower part of the fixing member is joined to the underside of the side member. 前記ブラケット部材と前記フランジ部との間には、前記サイドメンバと前記クロスメンバとの固定を補助する固定補助部材が設けられていることを特徴とする請求項３に記載の車両下部構造。 4. The vehicle underbody structure according to claim 3 , wherein an auxiliary fixing member for assisting in fixing the side member and the cross member is provided between the bracket member and the flange portion.
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