JP4858183B2 - Lower body structure - Google Patents

Lower body structure Download PDF

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Publication number
JP4858183B2
JP4858183B2 JP2007011448A JP2007011448A JP4858183B2 JP 4858183 B2 JP4858183 B2 JP 4858183B2 JP 2007011448 A JP2007011448 A JP 2007011448A JP 2007011448 A JP2007011448 A JP 2007011448A JP 4858183 B2 JP4858183 B2 JP 4858183B2
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vehicle
closed
battery
extension
housing recess
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JP2008174181A (en
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周 橋本
厚 波入
理人 黒川
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Nissan Motor Co Ltd
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Nissan Motor Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B62LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62DMOTOR VEHICLES; TRAILERS
    • B62D21/00Understructures, i.e. chassis frame on which a vehicle body may be mounted
    • B62D21/15Understructures, i.e. chassis frame on which a vehicle body may be mounted having impact absorbing means, e.g. a frame designed to permanently or temporarily change shape or dimension upon impact with another body
    • B62D21/152Front or rear frames
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60KARRANGEMENT 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
    • B60K1/00Arrangement or mounting of electrical propulsion units
    • B60K1/04Arrangement or mounting of electrical propulsion units of the electric storage means for propulsion
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60YINDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2306/00Other features of vehicle sub-units
    • B60Y2306/01Reducing damages in case of crash, e.g. by improving battery protection

Description

本発明は、車体フロアの中央部に広い範囲に亘ってバッテリ収納凹部を設けた車体の下部構造に関する。   The present invention relates to a lower structure of a vehicle body in which a battery housing recess is provided over a wide range in a central portion of a vehicle body floor.

電気自動車では大容量のバッテリを搭載するため、バッテリの収納部を車体フロアに設けるようにしている。この場合、搭載するバッテリは大重量となり、これを支持する構造としては、例えば、特許文献1に開示される技術が従来存在する。   In order to mount a large-capacity battery in an electric vehicle, a battery storage unit is provided on the vehicle body floor. In this case, the battery to be mounted is heavy, and as a structure for supporting the battery, for example, a technique disclosed in Patent Document 1 has conventionally existed.

即ち、この特許文献1では、サイドシル、リアピラー、リヤサイドメンバにそれぞれの端部を結合した4本のクロスメンバを立体状に配置するとともに、これら4本のクロスメンバで囲まれる内方にバッテリを支持してある。   That is, in Patent Document 1, four cross members each having end portions coupled to a side sill, a rear pillar, and a rear side member are arranged in a three-dimensional shape, and a battery is supported inwardly surrounded by the four cross members. It is.

そして、4本のクロスメンバのうち後方上側に配置したクロスメンバを、伝達リンクを介してリヤピラー下部のサイドシル部分に連結することにより、この伝達リンクがサイドシル側端部が車両前方かつ下方に傾斜する状態で配置されることにより、前面衝突時等で前方移動するバッテリ荷重を、前記伝達リンクを介してクロスメンバに後ろ向きに作用させて支持するようにしている。
特開平5−305879号公報(第3頁、図1)
Then, by connecting the cross member disposed on the upper rear side of the four cross members to the side sill portion of the lower part of the rear pillar via the transmission link, the side sill side end of the transmission link is inclined forward and downward in the vehicle. By being arranged in a state, the battery load that moves forward at the time of a frontal collision or the like is supported by acting backward on the cross member via the transmission link.
JP-A-5-305879 (page 3, FIG. 1)

しかしながら、かかる従来の車体下部構造では、伝達リンク等により大重量のバッテリを支持する構造となっているが、例えば、ポール側突等によって局所的な側突入力がサイドシルの連結リンクを結合した部分に作用した場合、この連結リンクが曲げ変形してしまう恐れがあり、このように連結リンクが変形すると本来のバッテリ支持機能を十分に発揮できなくなってしまう。   However, in such a conventional vehicle body lower structure, a heavy battery is supported by a transmission link or the like. For example, a part in which a local side collision input is coupled to a connecting link of a side sill by a pole side collision or the like. If this occurs, the connecting link may be bent and deformed. If the connecting link is deformed in this manner, the original battery support function cannot be fully exhibited.

そこで、サイドシルに局所的な側突入力が入力された場合に、反力を確保しつつ潰れストロークを稼いで衝突エネルギーを効率良く吸収させるためには、例えば、前記伝達リンクの板厚を増大するなどして強度を高める必要があるが、この場合は重量増となってしまうとともに、却って、サイドシルが局所的に変形されてしまうため、衝突エネルギーを十分に吸収できなくなってしまい、結果的にバッテリの搭載量が削減されてしまうことになる。   Therefore, when a local side collision input is input to the side sill, for example, the thickness of the transmission link is increased in order to increase the crushing stroke while ensuring the reaction force and efficiently absorb the collision energy. However, in this case, the weight is increased and the side sill is locally deformed, so that the collision energy cannot be sufficiently absorbed, resulting in a battery. Will be reduced.

また、伝達リンクに十分な強度を持たせたとしても、バッテリを囲むように配置したクロスメンバは4本と数が多いため、各クロスメンバの強度を高めると全体的な重量が大幅に嵩んでしまうため、どうしても各クロスメンバが細くなってしまう。このため、前記側突荷重の伝達やエネルギー吸収を十分に行うことができなくなってしまう。   Even if the transmission link has sufficient strength, the number of cross members arranged so as to surround the battery is as large as four, so increasing the strength of each cross member increases the overall weight significantly. Therefore, each cross member is inevitably thin. For this reason, it becomes impossible to sufficiently transmit the side impact load and absorb energy.

そこで、本発明は、サイドシルに入力される局所的な側突荷重を効率良く吸収しつつ、搭載したバッテリを効果的に保護することができる車体下部構造を提供するものである。   Therefore, the present invention provides a vehicle body lower structure capable of effectively protecting a mounted battery while efficiently absorbing a local side impact load input to a side sill.

本発明は、車幅方向両側に車両前後方向に延在する閉断面構造のサイドシルと、左右のサイドシルの車幅方向内側面に跨って接合したフロアパネルと、フロアパネルの中央部分を上方に膨出形成したバッテリ収納凹部と、バッテリを収納し、前記バッテリ収納凹部の下側開口部の周縁部に取り付けて該バッテリを前記バッテリ収納凹部に配置したバッテリトレイと、を備えた車体下部構造であって、前記バッテリ収納凹部の車幅方向側壁下部の外側隅部に沿って車両前後方向に延在する閉断面構造のエクステンションメンバと、左右のサイドシルに跨って設けられ、バッテリ収納凹部の天井壁上面との間に閉断面を形成して車幅方向に延在する断面略逆U字状のクロスメンバと、を備え、前記クロスメンバの車幅方向端部を、サイドシルの内側面上部からフロア一般面を経てバッテリ収納凹部の車幅方向側壁上部に至るフロア側部の断面形状に沿って接合して、該フロア側部に第1の閉断面構造部を形成したことを最も主要な特徴とする。   The present invention includes a side sill having a closed cross-sectional structure extending in the vehicle front-rear direction on both sides in the vehicle width direction, a floor panel joined across the vehicle width direction inner side surfaces of the left and right side sills, and a center portion of the floor panel bulging upward. A vehicle body lower structure comprising: a formed battery storage recess; and a battery tray that stores the battery and is attached to a peripheral edge of a lower opening of the battery storage recess and the battery is disposed in the battery storage recess. An extension member having a closed cross-sectional structure that extends in the vehicle front-rear direction along the outer corner of the lower part of the side wall in the vehicle width direction of the battery storage recess, and the upper surface of the ceiling wall of the battery storage recess. And a cross member having a substantially inverted U-shaped cross section extending in the vehicle width direction and forming a closed cross section between the cross member and an end of the cross member in the vehicle width direction. The first closed cross-section structure part is formed on the floor side part by joining along the cross-sectional shape of the floor side part extending from the upper part of the surface to the upper part of the side wall in the vehicle width direction of the battery housing recess. Main features.

本発明によれば、バッテリ収納凹部の形成領域においてサイドシルに局所的な側突荷重が入力された場合、この側突荷重はサイドシルからクロスメンバに入力されるのであるが、該クロスメンバの端部には第1の閉断面構造部が形成されているため、該第1の閉断面構造部によって大きな反力を発生させることができる。   According to the present invention, when a local side impact load is input to the side sill in the formation region of the battery housing recess, the side impact load is input from the side sill to the cross member. Since the first closed cross-section structure portion is formed on the, a large reaction force can be generated by the first closed cross-section structure portion.

つまり、前記第1の閉断面構造部はクロスメンバの前後側壁が入力荷重に対してシェア面として機能するため、特にこれら前後側壁で大きな反力を発生させつつ第1の閉断面構造部が潰れることにより、前記局所的な側突荷重の入力エネルギーを効率良く吸収できるとともに、クロスメンバを介して前記入力荷重をバッテリ収納凹部の天井壁や車体の非衝突側に拡散でき、ひいては、バッテリトレイの変形を抑制してバッテリの保護効果を高めることができる。   That is, in the first closed cross-section structure portion, the front and rear side walls of the cross member function as a shear plane with respect to the input load. Therefore, the first closed cross-section structure portion is crushed while generating a large reaction force on these front and rear side walls. As a result, the input energy of the local side impact load can be efficiently absorbed, and the input load can be diffused to the ceiling wall of the battery housing recess and the non-collision side of the vehicle body via the cross member. It is possible to suppress the deformation and enhance the battery protection effect.

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

図1〜図6は本発明にかかる車体下部構造の第1実施形態を示し、図1は車体下部の平面図、図2は車体下部の底面図であり、図3は図1中A−A線に沿った断面図、図4は図1中B−B線に沿った車体左側半分の断面図、図5は図1中C部の拡大斜視図、また、図6は側突された状態を(a),(b)に順を追って示す車体左側半分の断面図である。   1 to 6 show a first embodiment of a lower body structure according to the present invention, FIG. 1 is a plan view of the lower part of the vehicle body, FIG. 2 is a bottom view of the lower part of the vehicle body, and FIG. 4 is a cross-sectional view of the left half of the vehicle body along the line BB in FIG. 1, FIG. 5 is an enlarged perspective view of a portion C in FIG. 1, and FIG. FIG. 4 is a cross-sectional view of the left half of the vehicle body in order shown in FIGS.

本実施形態の車体下部構造は、図1〜図3に示すように車体前部の車幅方向両側に車両前後方向に延在する左右一対のフロントサイドメンバ1が配置され、これらフロントサイドメンバ1の車両後方は下方に傾斜するキックアップ部2を介してダッシュパネル3の下側に回り込み、そして、フロントサイドメンバ1の後端部1Rはフロアパネル4の前部下側へと連なる。   As shown in FIGS. 1 to 3, the vehicle body lower structure of the present embodiment includes a pair of left and right front side members 1 extending in the vehicle front-rear direction on both sides in the vehicle width direction of the front portion of the vehicle body. The rear side of the vehicle wraps around the lower side of the dash panel 3 via the kick-up portion 2 inclined downward, and the rear end portion 1R of the front side member 1 continues to the lower side of the front portion of the floor panel 4.

ダッシュパネル3の車幅方向両側部には左右一対のフロントピラー5が立設し、これらフロントピラー5からフードリッジメンバ6が前記フロントサイドメンバ1の上方に位置して車両前方に延在する一方、前記フロントピラー5の下端部からサイドシル8がリヤホイールハウス7の形成部分まで車両後方に延在している。   A pair of left and right front pillars 5 are erected on both sides of the dash panel 3 in the vehicle width direction, and a hood ridge member 6 is located above the front side member 1 and extends forward from the front pillar 5. The side sill 8 extends from the lower end of the front pillar 5 to the rear wheel house 7 forming portion in the rear of the vehicle.

サイドシル8は、図4に示すようにそれぞれハット形断面に形成したシルインナパネル8aとシルアウタパネル8bとを接合して閉断面に形成され、このサイドシル8の後端部からリアサイドメンバ9がリヤホイールハウス7の内側を通過して車両後方に延在している。   As shown in FIG. 4, the side sill 8 is formed in a closed cross section by joining a sill inner panel 8a and a sill outer panel 8b each formed in a hat-shaped cross section, and a rear side member 9 is connected to a rear wheel from the rear end portion of the side sill 8. It passes through the inside of the house 7 and extends to the rear of the vehicle.

また、前記フロアパネル4の前部上側には、フロントサイドメンバ1の後端部1Rに対応した位置にフロントサイドメンバエクステンション10が接合され、その後方にはエクステンションメンバ11が連なる。尚、図1中、12はアウトリガである。   Further, a front side member extension 10 is joined to the front upper side of the floor panel 4 at a position corresponding to the rear end 1R of the front side member 1, and an extension member 11 is connected to the rear thereof. In FIG. 1, reference numeral 12 denotes an outrigger.

前記フロアパネル4は、フロア前部のフロントフロア4Fとフロア後部のリヤフロア4Rとからなり、フロントフロア4Fの車幅方向両側部が左右一対のサイドシル8のシルインナパネル8aの下部に接合されるとともに、リアフロア4Rの車幅方向両側部がリヤサイドメンバ9の上側に接合支持される。   The floor panel 4 includes a front floor 4F at the front of the floor and a rear floor 4R at the rear of the floor, and both sides of the front floor 4F in the vehicle width direction are joined to lower portions of the sill inner panels 8a of the pair of left and right side sills 8. The both sides of the rear floor 4R in the vehicle width direction are joined and supported on the upper side of the rear side member 9.

図3に示すように前記リヤサイドメンバ9はリヤホイールハウス7に対応する部分から車両後方に向かって上方に持ち上げられ、これらリヤサイドメンバ9の下方にリヤサスペンションメンバSMrが配置される。   As shown in FIG. 3, the rear side member 9 is lifted upward from the portion corresponding to the rear wheel house 7 toward the rear of the vehicle, and a rear suspension member SMr is disposed below the rear side member 9.

前記フロアパネル4には、車幅方向中央部にリヤサイドメンバ9の上端よりも若干高くなる高さhをもってバッテリ収納凹部13を上方に膨出形成し、そのバッテリ収納凹部13の下側開口部13aをバッテリトレイ14によって閉止するようにしている。   The floor panel 4 has a battery housing recess 13 bulging upward at a height h slightly higher than the upper end of the rear side member 9 at the center in the vehicle width direction, and a lower opening 13a of the battery housing recess 13 Is closed by the battery tray 14.

前記バッテリトレイ14は、図4に示すようにバッテリ収納凹部13の下側開口部13aの周縁部にボルト15を介して締結され、このバッテリ収納凹部13内には複数のバッテリ16が収納される。尚、本実施形態では前記バッテリ収納凹部13は、リヤフロア4R部分で段差をもって更に上方に膨出され、この上段のバッテリ収納凹部13U内にもバッテリ16が2段重ねに収納される。   As shown in FIG. 4, the battery tray 14 is fastened to the peripheral edge of the lower opening 13 a of the battery housing recess 13 via bolts 15, and a plurality of batteries 16 are housed in the battery housing recess 13. . In the present embodiment, the battery housing recess 13 is further bulged upward with a step at the rear floor 4R, and the batteries 16 are also housed in two layers in the upper battery housing recess 13U.

即ち、バッテリ収納凹部13は、前側の収納凹部13Lと、後側の収納凹部13Uとにより構成され、該後側の収納凹部13Uの下側開口部13aは、バッテリトレイ14の後側部に立上げて形成したトレイ後部によって閉止される。   That is, the battery storage recess 13 is constituted by a front storage recess 13L and a rear storage recess 13U, and the lower opening 13a of the rear storage recess 13U stands on the rear side of the battery tray 14. The tray is closed by the raised tray.

一方、フロントフロア4Fの上面には、前側のバッテリ収納凹部13Lの前壁13Lfに沿って閉断面構造のフロントフロアクロスメンバ17が左右のサイドシル8間に跨って配設されるとともに、後側のバッテリ収納凹部13Uの前壁13Ufに沿ってリヤシートクロスメンバ18が左右のサイドシル8間に跨って配設され、このリヤシートクロスメンバ18に図外のリヤシートの脚部を取り付けるようになっている。   On the other hand, on the upper surface of the front floor 4F, a front floor cross member 17 having a closed cross-sectional structure is disposed across the left and right side sills 8 along the front wall 13Lf of the front battery storage recess 13L, and the rear side A rear seat cross member 18 is disposed between the left and right side sills 8 along the front wall 13Uf of the battery housing recess 13U, and a leg portion of a rear seat (not shown) is attached to the rear seat cross member 18.

前記エクステンションメンバ11は、図4に示すように前側のバッテリ収納凹部13Lの車幅方向側壁13Lsの下部に形成された外側隅部C1に沿って車両前後方向に延在しており、この外側隅部C1との間に閉断面が形成されている。   As shown in FIG. 4, the extension member 11 extends in the vehicle front-rear direction along an outer corner C1 formed at the lower part of the vehicle width direction side wall 13Ls of the front battery housing recess 13L. A closed cross section is formed between the portion C1.

また、図1,図3,図4に示すように前側のバッテリ収納凹部13Lには、その天井壁13Lt上面との間に閉断面を形成し、左右のサイドシル8,8に跨って車幅方向に延在する断面略逆U字状のクロスメンバ19を設けてある。尚、図5に示すように前記天井壁13Ltには車幅方向に延びる複数の膨出リブKを成形して、該天井壁13Ltを補強してある。   Further, as shown in FIGS. 1, 3 and 4, the front battery housing recess 13L has a closed cross section with the top surface of the ceiling wall 13Lt, and extends in the vehicle width direction across the left and right side sills 8, 8. A cross member 19 having a substantially inverted U-shaped cross section is provided. As shown in FIG. 5, a plurality of bulging ribs K extending in the vehicle width direction are formed on the ceiling wall 13Lt to reinforce the ceiling wall 13Lt.

前記クロスメンバ19は、図5に示すように前側壁19fと後側壁19rと天井壁19tとによって断面略逆U字状としてあり、前後両側壁19f,19rの下端部を前記バッテリ収納凹部13Lの天井壁13Lt上面に接合してある。   As shown in FIG. 5, the cross member 19 has a substantially inverted U-shaped cross section with a front side wall 19f, a rear side wall 19r, and a ceiling wall 19t, and the lower ends of the front and rear side walls 19f, 19r are formed on the battery housing recess 13L. It is joined to the upper surface of the ceiling wall 13Lt.

そして、本実施形態では図4,図5に示すように、前記クロスメンバ19の車幅方向端部19eを、サイドシル8の内側面上部からフロア一般面を経てバッテリ収納凹部13Lの車幅方向側壁13Lsの上部に至るフロア側部Fsの断面形状に沿って接合して、該フロア側部Fsに第1の閉断面構造部20を形成してある。   In the present embodiment, as shown in FIGS. 4 and 5, the vehicle width direction end portion 19 e of the cross member 19 is connected to the side wall in the vehicle width direction of the battery housing recess 13 </ b> L from the upper inner surface of the side sill 8 through the general floor surface. The first closed cross-section structure portion 20 is formed on the floor side portion Fs by joining along the cross-sectional shape of the floor side portion Fs reaching the top of 13Ls.

前記フロア側部Fsは、図4に示すようにサイドシル8の略垂直なシルインナパネル8aと、このシルインナパネル8aの下部に接合した略水平なフロアパネル4の車幅方向側部と、このフロアパネル4に接合した略垂直な外側面11aと略水平な上側面11bで断面L字状に形成したエクステンションメンバ11と、このエクステンションメンバ11の上側面11b端を接合したバッテリ収納凹部13Lの車幅方向側壁13Lsと、によって凹設形状に形成される。   As shown in FIG. 4, the floor side portion Fs includes a substantially vertical sill inner panel 8a of the side sill 8, a side portion in the vehicle width direction of the substantially horizontal floor panel 4 joined to the lower portion of the sill inner panel 8a, A vehicle having an extension member 11 formed in an L-shaped cross section with a substantially vertical outer surface 11a joined to the floor panel 4 and a substantially horizontal upper side surface 11b, and a battery housing recess 13L joined with the end of the upper side surface 11b of the extension member 11 It is formed in a concave shape by the width direction side wall 13Ls.

そして、前記クロスメンバ19の車幅方向端部19eの前後両側壁19f,19rをフロア側部Fsの凹設形状に沿って形成し、これら前後両側壁19f,19rをフロア側部Fsの内側に沿って接合してある。   And the front and rear side walls 19f and 19r of the vehicle width direction end portion 19e of the cross member 19 are formed along the recessed shape of the floor side portion Fs, and these front and rear side walls 19f and 19r are inside the floor side portion Fs. It is joined along.

この車幅方向端部19eの天井壁19tは、バッテリ収納凹部13Lの車幅方向側壁13Lsの上方部分から丸みをもってなだらかに下方に傾斜して、サイドシル8の上面に連なっている。   The ceiling wall 19t of the vehicle width direction end 19e is rounded gently downward from the upper part of the vehicle width direction side wall 13Ls of the battery housing recess 13L and continues to the upper surface of the side sill 8.

また、前記第1の閉断面構造部20内には、前後両側壁19f,19rと、サイドシル8の内側面となるシルインナパネル8aの上端部と、エクステンションメンバ11の上側面11bとに亘って接合されて、第1の閉断面構造部20内を上方閉断面部20Uと下方閉断面部20Lとに上下に分割する第1の荷重伝達板としてのガセット21を取り付けてある。   In the first closed cross-section structure portion 20, the front and rear side walls 19 f and 19 r, the upper end portion of the sill inner panel 8 a serving as the inner side surface of the side sill 8, and the upper side surface 11 b of the extension member 11 are spanned. A gusset 21 is attached as a first load transmission plate which is joined and divides the inside of the first closed cross-section structure portion 20 into an upper closed cross-section portion 20U and a lower closed cross-section portion 20L.

前記バッテリトレイ14は、図4に示すように下部周縁部に閉断面構造の周縁フレーム14aが設けられ、この周縁フレーム14aで囲まれた内方が底板14bで閉塞されるとともに、図3,図4に示すようにこの周縁フレーム14aから前側のバッテリ収納凹部13Lの前壁13Lfおよび車幅方向両側壁13Lsの内側に沿ってトレイ側壁部14c,14dが立設されている。   As shown in FIG. 4, the battery tray 14 is provided with a peripheral frame 14a having a closed cross-sectional structure at the lower peripheral portion, and an inner side surrounded by the peripheral frame 14a is closed by a bottom plate 14b. As shown in FIG. 4, tray side wall portions 14c and 14d are erected from the peripheral frame 14a along the inside of the front wall 13Lf of the front battery housing recess 13L and the side walls 13Ls in the vehicle width direction.

また、上記トレイ側壁部14c,14dで囲まれた上端内方がバッテリカバー14eで閉塞され、トレイ側壁部14c,14dおよび底板14bとバッテリカバー14eで密閉される内方空間Sに下段のバッテリ16が収納される。   Further, the upper inner side surrounded by the tray side wall portions 14c and 14d is closed by the battery cover 14e, and the lower battery 16 is placed in the inner space S sealed by the tray side wall portions 14c and 14d, the bottom plate 14b and the battery cover 14e. Is stored.

そして、前記バッテリトレイ14の周縁フレーム14aをエクステンションメンバ11の閉断面下側に対応した部位にボルト15により締結して取付けるとともに、この周縁フレーム14aから前記車幅方向側壁13Lsの内側に沿って立設した前記トレイ側壁部14c,14dを、下方から上方に向かって車幅方向間隔が徐々に狭くなる第2の閉断面構造部22として形成してある。   Then, the peripheral frame 14a of the battery tray 14 is fastened and attached to the portion corresponding to the lower side of the closed cross section of the extension member 11 with bolts 15 and stands along the inner side of the side wall 13Ls in the vehicle width direction from the peripheral frame 14a. The provided tray side wall portions 14c and 14d are formed as a second closed cross-section structure portion 22 in which the distance in the vehicle width direction gradually decreases from the bottom to the top.

即ち、前記第2の閉断面構造部22は、前記トレイ側壁部14dを代表して説明すると、その内側壁14dinと外側壁14doutと上端面14dtopとによって、上下方向に長くなる断面台形状に形成し、内側壁14dinと外側壁14doutの間隔を上方に行くに従って徐々に狭くすることにより構成してある。尚、本実施形態では前記第2の閉断面構造部22の上下中央部に横リブ壁22aが設けられる。   That is, the second closed cross-section structure portion 22 will be described as a representative of the tray side wall portion 14d. The inner side wall 14din, the outer wall 14dout, and the upper end surface 14dtop are formed into a trapezoidal cross section that is elongated in the vertical direction. The distance between the inner side wall 14din and the outer side wall 14dout is gradually narrowed as it goes upward. In the present embodiment, a lateral rib wall 22 a is provided in the upper and lower central part of the second closed cross-section structure part 22.

そして、前側のバッテリ収納凹部13Lの車幅方向側壁13Lsと天井壁13Ltとの間に形成される内側上隅部C2に、前記第2の閉断面構造部22の上端面4dtopに対向する第3の閉断面構造部23を設け、この第3の閉断面構造部23の下端面23aと前記第2の閉断面構造部22の上端面14dtopとの間にシール部材としてのウエザーストリップ24を配設してある。   A third inner surface C2 formed between the vehicle width direction side wall 13Ls and the ceiling wall 13Lt of the front battery storage recess 13L is opposed to the upper end surface 4dtop of the second closed cross-section structure portion 22. And a weather strip 24 as a sealing member is disposed between the lower end surface 23a of the third closed cross-section structure portion 23 and the upper end surface 14dtop of the second closed cross-section structure portion 22. It is.

更に、前記トレイ側壁部14dの第2の閉断面構造部22内に、エクステンションメンバ11の上側面11bに対応した位置で内外側壁14din,14doutを連結する第2の荷重伝達板としての横リブ25を取り付けてある。   Further, in the second closed cross-section structure portion 22 of the tray side wall portion 14d, a lateral rib 25 as a second load transmission plate for connecting the inner and outer walls 14din, 14dout at a position corresponding to the upper side surface 11b of the extension member 11. Is attached.

ところで、本実施形態では図1に示すようにフロントサイドメンバ1の後部1Rに連結されるフロントサイドメンバエクステンション10の後方にエクステンションメンバ11が連なっているが、これらエクステンションメンバ11とフロントサイドメンバエクステンション10のそれぞれの車外側稜線11rid,10ridを図1中P1部分で繋げるとともに、リヤサイドメンバ9の前端部9fをサイドシル8の後端部8rの内側面であるシルインナパネル8aに図1中P2部分で結合してある。   Incidentally, in this embodiment, as shown in FIG. 1, the extension member 11 is connected to the rear of the front side member extension 10 connected to the rear portion 1 </ b> R of the front side member 1, but these extension member 11 and front side member extension 10 are connected. 1 are connected at the P1 portion in FIG. 1, and the front end portion 9f of the rear side member 9 is connected to the sill inner panel 8a which is the inner surface of the rear end portion 8r of the side sill 8 at the P2 portion in FIG. It is connected.

以上の構成により本実施形態の車体下部構造によれば、図6(a)に示すようにポール等の障害物OBに側面衝突して、前側のバッテリ収納凹部13Lの形成領域においてサイドシル8に局所的な側突荷重F0が入力された場合、この側突荷重F0はF1〜F5の経路を通過してバッテリトレイ14や車体の非衝突側に伝達される。   With the above structure, according to the vehicle body lower structure of the present embodiment, as shown in FIG. 6 (a), a side collision with an obstacle OB such as a pole causes local collision with the side sill 8 in the formation region of the front battery housing recess 13L. When a typical side impact load F0 is input, the side impact load F0 passes through the paths F1 to F5 and is transmitted to the battery tray 14 and the non-collision side of the vehicle body.

このとき、前記側突荷重F0は図6(b)に示すようにサイドシル8を潰しつつクロスメンバ19の端部19eに入力されるのであるが、このクロスメンバ19の端部19eには第1の閉断面構造部20が形成されているため、該第1の閉断面構造部20によって大きな反力を発生させることができる。   At this time, the side impact load F0 is input to the end 19e of the cross member 19 while the side sill 8 is crushed as shown in FIG. 6B. Since the closed cross-section structure portion 20 is formed, a large reaction force can be generated by the first closed cross-section structure portion 20.

つまり、前記第1の閉断面構造部20はクロスメンバ19の前後側壁19f,19rが入力荷重に対してシェア面として機能するため、特にこれら前後側壁19f,19rで大きな反力を発生させつつ第1の閉断面構造部20が潰れることにより、前記局所的な側突荷重F0の入力エネルギーを効率良く吸収できる。   That is, since the front and rear side walls 19f and 19r of the cross member 19 function as a shear plane with respect to the input load, the first closed cross-section structure portion 20 generates a large reaction force particularly at the front and rear side walls 19f and 19r. By collapsing one closed cross-section structure portion 20, the input energy of the local side impact load F0 can be efficiently absorbed.

また、前記エネルギーの効率良い吸収と相俟って、クロスメンバ19を介して前記側突荷重F3をバッテリ収納凹部13Lの天井壁13Ltや車体の非衝突側に拡散できるため、バッテリトレイ14のトレイ側壁部14d(14c)の変形を抑制してバッテリ16の保護効果を高めることができる。   Further, in combination with the efficient absorption of the energy, the side impact load F3 can be diffused to the ceiling wall 13Lt of the battery housing recess 13L and the non-collision side of the vehicle body via the cross member 19, so the tray of the battery tray 14 The deformation effect of the side wall part 14d (14c) can be suppressed, and the protection effect of the battery 16 can be enhanced.

更に、本実施形態にあっては図4に示すように、フロアパネル4を上方に膨出形成したバッテリ収納凹部13にバッテリトレイ14を格納配置したことにより、このバッテリトレイ14に収納したバッテリ16の重心G高さが、車体下部の両側骨格を成すサイドシル8の下端位置よりも上方に位置している。   Further, in the present embodiment, as shown in FIG. 4, the battery tray 14 is stored and arranged in the battery storage recess 13 in which the floor panel 4 is formed to bulge upward, so that the battery 16 stored in the battery tray 14 is stored. The center of gravity G is located above the lower end position of the side sill 8 that forms both side skeletons of the lower part of the vehicle body.

つまり、バッテリトレイ14を車体側に取り付ける周縁フレーム14aは、エクステンションメンバ11およびフロアパネル4の車幅方向側部を介して前記サイドシル8に支持されることになるが、そのとき、フロアパネル4をフラットにしてその下側にバッテリトレイを取り付ける場合に比較して、前記バッテリ16の重心Gとサイドシル8との上下オフセット量を小さくできるため、バッテリ16の質量によるモーメントを減少でき、ひいては、サイドシル8の軽量化を図ることができる。   That is, the peripheral frame 14a for attaching the battery tray 14 to the vehicle body side is supported by the side sill 8 via the extension member 11 and the side portion of the floor panel 4 in the vehicle width direction. Compared with the case where the battery tray is mounted flat on the lower side, the vertical offset amount between the center of gravity G of the battery 16 and the side sill 8 can be reduced, so that the moment due to the mass of the battery 16 can be reduced. Can be reduced in weight.

更に本実施形態では、前記第1の閉断面構造部20内の前後両側壁19f,9rとサイドシル8のシルインナパネル8aとエクステンションメンバ11の上側面11bとに亘ってガセット21を取り付けたので、第1の閉断面構造部20が潰れる際にガセット21が抵抗となって更に大きな反力を発生させることができ、ひいては、側突エネルギーの吸収効率を高めることができる。   Further, in the present embodiment, the gusset 21 is attached across the front and rear side walls 19f, 9r in the first closed cross-section structure portion 20, the sill inner panel 8a of the side sill 8, and the upper side surface 11b of the extension member 11. When the first closed cross-section structure portion 20 is crushed, the gusset 21 becomes a resistance and can generate a larger reaction force. As a result, the absorption efficiency of the side collision energy can be increased.

また、前記バッテリトレイ14の周縁フレーム14aをエクステンションメンバ11の閉断面下側に対応した部位にボルト15を介して取付けたので、エクステンションメンバ11の閉断面部分で前記側突荷重F5が周縁フレーム14aに入力されるのを低減し、ひいては、周縁フレーム14aが車体から離脱されるのを防止できる。   Further, since the peripheral frame 14a of the battery tray 14 is attached to the portion corresponding to the lower side of the closed cross section of the extension member 11 via the bolt 15, the side impact load F5 is applied to the peripheral frame 14a at the closed cross section of the extension member 11. Can be reduced, and as a result, the peripheral frame 14a can be prevented from being detached from the vehicle body.

更に、前記トレイ側壁部14c,14dに、下方から上方に向かって車幅方向間隔が徐々に狭くなる第2の閉断面構造部22を形成したので、側方からの入力に対してトレイ側壁部14c,14dの強度が高くなり、クロスメンバ19の端部19eから入力される前記側突荷重F4に対してトレイ側壁部14c,14dの倒れを抑制し、ひいては、前記バッテリトレイ14の変形を抑制してバッテリ16の保護効果を高めることができる。   Furthermore, since the second closed cross-section structure portion 22 in which the interval in the vehicle width direction gradually narrows from the lower side to the upper side is formed on the tray side wall portions 14c and 14d, the tray side wall portion is adapted to the input from the side. The strengths of 14c and 14d are increased, and the side wall portions 14c and 14d are prevented from falling due to the side impact load F4 input from the end 19e of the cross member 19, and thus the deformation of the battery tray 14 is suppressed. Thus, the protection effect of the battery 16 can be enhanced.

また、トレイ側壁部14c,14dは、前述したように上方に向かって幅狭としてあることにより、バッテリトレイ14をバッテリ収納凹部13Lに組み付ける際に、バッテリ収納凹部13Lの側壁13Lsと前記トレイ側壁部14dとの嵌合誤差を減少して、これら両壁13Ls,14d間のシール性を確保することができる。   Since the tray side wall portions 14c and 14d are narrower upward as described above, the side wall portion 13Ls of the battery storage recess portion 13L and the tray side wall portion when the battery tray 14 is assembled to the battery storage recess portion 13L. The fitting error with 14d can be reduced, and the sealing performance between these walls 13Ls, 14d can be ensured.

更に、前記バッテリ収納凹部13Lの車幅方向側壁13Lsと天井壁13Ltとの間の内側上隅部C2に第3の閉断面構造部23を設け、この第3の閉断面構造部23の下端面23aと前記第2の閉断面構造部22の上端面14dtopとの間にウエザーストリップ24を配設したので、バッテリ収納凹部13L内の密閉性を高めることができる。   Further, a third closed cross-section structure portion 23 is provided at the inner upper corner C2 between the vehicle width direction side wall 13Ls and the ceiling wall 13Lt of the battery housing recess 13L, and the lower end surface of the third closed cross-section structure portion 23 Since the weather strip 24 is disposed between the upper closed surface 14dtop of the second closed cross-section structure portion 22a and the second closed cross-section structure portion 22, the airtightness in the battery housing recess 13L can be improved.

更にまた、前記トレイ側壁部14c,14dの第2の閉断面構造部22内に、エクステンションメンバ11の上側面11bに対応した位置で内外側壁14din,14doutを連結する横リブ25を取り付けたので、エクステンションメンバ11に入力される側突荷重F1を該横リブ25を介してトレイ側壁部14c,14dで支持してエクステンションメンバ11の曲げ変形を抑制できる。これによって第1の閉断面構造部20、特に下方閉断面部20Lによって発生する反力を更に増大して側突エネルギーの吸収効率をより高めることができる。   Furthermore, since the lateral ribs 25 that connect the inner and outer walls 14din and 14dout are attached in the second closed cross-section structure portion 22 of the tray side wall portions 14c and 14d at a position corresponding to the upper side surface 11b of the extension member 11, The side impact load F1 input to the extension member 11 is supported by the tray side wall portions 14c and 14d via the lateral rib 25, and bending deformation of the extension member 11 can be suppressed. As a result, the reaction force generated by the first closed cross-section structure portion 20, particularly the lower closed cross-section portion 20 </ b> L, can be further increased to further increase the side energy absorption efficiency.

また、本実施形態ではエクステンションメンバ11とフロントサイドメンバエクステンション10のそれぞれの車外側稜線11rid,10ridを繋げたので、前面衝突した場合の衝突荷重をエクステンションメンバ11を介して車体後方へと円滑に分散でき、前席乗員の足下スペースを確保し易くなる。一方、リヤサイドメンバ9の前端部9fをサイドシル8の後端部8rの内側面に結合したので、後面衝突した場合の衝突荷重をリヤサイドメンバ9からサイドシル8へと円滑に分散でき、後側のバッテリ収納凹部13Uへの影響を最小限に留めることができる。   Further, in the present embodiment, since the vehicle exterior ridge lines 11rid and 10rid of the extension member 11 and the front side member extension 10 are connected, the collision load in the case of a frontal collision is smoothly distributed to the rear of the vehicle body via the extension member 11. This makes it easier to secure the foot space for the front seat occupant. On the other hand, since the front end portion 9f of the rear side member 9 is coupled to the inner surface of the rear end portion 8r of the side sill 8, the collision load in the case of a rear collision can be smoothly distributed from the rear side member 9 to the side sill 8, and the rear battery The influence on the storage recess 13U can be minimized.

ところで、本実施形態にあっては後側のバッテリ収納凹部13Uの前壁13Ufに沿ってリヤシートクロスメンバ18が配設されるが、このリアシートクロスメンバ18にあってもそれの車幅方向端部の構造を、前記クロスメンバ19の車幅方向端部19eの構造、つまり、第1の閉断面構造部20を設けた構造、更には、この第1の閉断面構造部20を車体側に支持する部分に第2,第3の閉断面構造部22,23およびガセット21、ウエザーストリップ24、横リブ25を設けることが望ましい。   By the way, in the present embodiment, the rear seat cross member 18 is disposed along the front wall 13Uf of the battery housing recess 13U on the rear side. The structure of the cross member 19 in the vehicle width direction end portion 19e, that is, the structure provided with the first closed cross-section structure portion 20, and further, the first closed cross-section structure portion 20 is supported on the vehicle body side. It is desirable to provide the second and third closed cross-section structures 22 and 23, the gusset 21, the weather strip 24, and the lateral rib 25 in the portion to be processed.

図7は本発明の第2実施形態を示し、前記第1実施形態と同一構成部分に同一符号を付して重複する説明を省略して述べるものとし、図7は車体下部のバッテリ収納凹部の形成部分を示す要部平面図である。   FIG. 7 shows a second embodiment of the present invention, in which the same components as those in the first embodiment are denoted by the same reference numerals and redundant description is omitted, and FIG. It is a principal part top view which shows a formation part.

本実施形態の車体下部構造は基本的に第1実施形態と略同様となり、図7に示すように車幅方向両側に外側から順にサイドシル8およびエクステンションメンバ11が配設され、フロアパネル4の中央部にバッテリ収納凹部13が設けられており、このバッテリ収納凹部13Lの天井壁13Ltには、その上面との間に閉断面を形成し、左右のサイドシル8,8に跨って車幅方向に延在するクロスメンバ19が配設されている。   The vehicle body lower structure of the present embodiment is basically the same as that of the first embodiment. As shown in FIG. 7, a side sill 8 and an extension member 11 are arranged in order from the outside on both sides in the vehicle width direction. A battery housing recess 13 is provided at the center, and the ceiling wall 13Lt of the battery housing recess 13L is formed with a closed cross section between the upper surface and extends in the vehicle width direction across the left and right side sills 8,8. An existing cross member 19 is disposed.

ここで、本実施形態が第1実施形態と主に異なる点は、前記クロスメンバ19を、バッテリ収納凹部13Lの形成範囲で車両前後方向に適宜間隔をおいて複数本配置するようになっている。   Here, this embodiment is mainly different from the first embodiment in that a plurality of the cross members 19 are arranged at appropriate intervals in the vehicle front-rear direction within the formation range of the battery housing recess 13L. .

前記複数本のクロスメンバ19は、それぞれが第1実施形態に示したクロスメンバ19と同様に断面略逆U字状に形成されて、それぞれの車幅方向端部19eに第1の閉断面構造部20が形成される。勿論、第2,第3の閉断面構造部22,23およびガセット21、ウエザーストリップ24、横リブ25を設けることが望ましい。   Each of the plurality of cross members 19 is formed in a substantially inverted U-shaped cross section, like the cross member 19 shown in the first embodiment, and has a first closed cross-sectional structure at each end portion 19e in the vehicle width direction. Part 20 is formed. Of course, it is desirable to provide the second and third closed cross-section structures 22 and 23, the gusset 21, the weather strip 24, and the lateral rib 25.

従って、本実施形態の車体下部構造によれば、側突荷重F0を複数本のクロスメンバ19で分散して受けることができるため、各クロスメンバ19での荷重負担を低減して側突エネルギーの吸収量を増大し、ひいては、バッテリトレイ14への影響を減少してバッテリ16の保護効果を更に高めることができる。   Therefore, according to the vehicle body lower structure of the present embodiment, the side collision load F0 can be received by the plurality of cross members 19 in a distributed manner, so that the load burden on each cross member 19 is reduced and the side collision energy is reduced. The amount of absorption can be increased, and as a result, the effect on the battery tray 14 can be reduced to further enhance the protection effect of the battery 16.

また、このように複数本のクロスメンバ19により車体前後方向に荷重分散できるので、フロアパネル4の縦曲げ剛性や捩れ剛性を向上することができるとともに、複数本のクロスメンバ19によりバッテリ収納凹部13Lの天井壁13Ltを全体的に補強できるため、該天井壁13Ltの面剛性が向上してドラミング現象による異音発生を阻止することができる。   Further, since the load can be distributed in the longitudinal direction of the vehicle body by the plurality of cross members 19 as described above, the vertical bending rigidity and the torsional rigidity of the floor panel 4 can be improved, and the battery housing recess 13L can be improved by the plurality of cross members 19. Since the ceiling wall 13Lt can be reinforced as a whole, the surface rigidity of the ceiling wall 13Lt can be improved and the generation of abnormal noise due to the drumming phenomenon can be prevented.

図8は本発明の第3実施形態を示し、前記各実施形態と同一構成部分に同一符号を付して重複する説明を省略して述べるものとし、図8は車体下部のバッテリ収納凹部の形成部分を示す要部平面図である。   FIG. 8 shows a third embodiment of the present invention, in which the same components as those in the above-described embodiments are denoted by the same reference numerals and redundant description is omitted, and FIG. It is a principal part top view which shows a part.

本実施形態の車体下部構造は基本的に第2実施形態と略同様となり、図8に示すようにクロスメンバ19が、バッテリ収納凹部13Lの形成範囲で車両前後方向に適宜間隔をおいて複数本配置されており、また、図4に示したようにバッテリトレイ14の周縁フレーム14aは、バッテリ収納凹部13の下側開口部13aの周縁部にボルト15によって取り付けられる。   The vehicle body lower structure of this embodiment is basically the same as that of the second embodiment. As shown in FIG. 8, a plurality of cross members 19 are provided at appropriate intervals in the vehicle front-rear direction within the range in which the battery housing recess 13L is formed. In addition, as shown in FIG. 4, the peripheral frame 14 a of the battery tray 14 is attached to the peripheral portion of the lower opening 13 a of the battery housing recess 13 with bolts 15.

ここで、本実施形態ではバッテリトレイ14の車幅方向端部の車体側取付点、つまり、前記ボルト15による締結位置を、前記複数本のクロスメンバ19の車幅方向軸線上にそれぞれ設定してある。   Here, in this embodiment, the vehicle body side attachment point at the vehicle width direction end of the battery tray 14, that is, the fastening position by the bolt 15 is set on the vehicle width direction axis of the plurality of cross members 19, respectively. is there.

従って、本実施形態の車体下部構造によれば、複数本のクロスメンバ19の車幅方向軸線上にバッテリトレイ14の取付点をそれぞれ設定したので、クロスメンバ19の車幅方向端部19eからエクステンションメンバ11を経由してバッテリトレイ14に伝達される側突荷重F5(図6(a)参照)を効率良く分散でき、バッテリトレイ14の変形の抑制効果を更に高めることができる。   Therefore, according to the vehicle body lower part structure of the present embodiment, since the attachment points of the battery tray 14 are set on the vehicle width direction axis of the plurality of cross members 19, respectively, the extension from the vehicle width direction end portion 19e of the cross member 19 is extended. The side impact load F5 (see FIG. 6A) transmitted to the battery tray 14 via the member 11 can be efficiently distributed, and the effect of suppressing deformation of the battery tray 14 can be further enhanced.

ところで、本発明の車体下部構造は前記第1〜第3実施形態に例をとって説明したが、これら実施形態に限ることなく本発明の要旨を逸脱しない範囲で他の実施形態を各種採用することができる。   By the way, although the vehicle body lower part structure of this invention was demonstrated taking the example in the said 1st-3rd embodiment, various other embodiment is employ | adopted in the range which is not restricted to these embodiments and does not deviate from the summary of this invention. be able to.

本発明の第1実施形態における車体下部の平面図。The top view of the vehicle body lower part in 1st Embodiment of this invention. 本発明の第1実施形態における車体下部の底面図。The bottom view of the vehicle body lower part in 1st Embodiment of this invention. 図1中A−A線に沿った断面図。Sectional drawing along the AA line in FIG. 図1中B−B線に沿った車体左側半分の断面図。Sectional drawing of the vehicle body left side half along the BB line in FIG. 図1中C部の拡大斜視図。The expansion perspective view of the C section in FIG. 本発明の第1実施形態における側突された状態を(a),(b)に順を追って示す車体左側半分の断面図。Sectional drawing of the vehicle body left side half which shows the state by which the side collision was carried out in 1st Embodiment of this invention in order to (a), (b). 本発明の第2実施形態における車体下部のバッテリ収納凹部の形成部分を示す要部平面図。The principal part top view which shows the formation part of the battery storage recessed part of the vehicle body lower part in 2nd Embodiment of this invention. 本発明の第3実施形態における車体下部のバッテリ収納凹部の形成部分を示す要部平面図。The principal part top view which shows the formation part of the battery storage recessed part of the vehicle body lower part in 3rd Embodiment of this invention.

符号の説明Explanation of symbols

1 フロントサイドメンバ
8 サイドシル
8a シルインナパネル(サイドシルの内側面)
8r サイドシルの後端部
9 リヤサイドメンバ
9f リヤサイドメンバの前端部
10 フロントサイドメンバエクステンション
10rid フロントサイドメンバエクステンションの車外側稜線
11 エクステンションメンバ
11rid エクステンションメンバの車外側稜線
13 バッテリ収納凹部
13a 下側開口部
13L 前側のバッテリ収納凹部
13Ls 車幅方向側壁
13Lt 天井壁
13U 後側のバッテリ収納凹部
14 バッテリトレイ
14a 周縁フレーム
14c,14d トレイ側壁部
14din 第2閉断面構造部の内側壁
14dout 第2閉断面構造部の外側壁
14dtop 第2閉断面構造部の上端面
16 バッテリ
19 クロスメンバ
19e クロスメンバの車幅方向端部
19f 前側壁
19r 後側壁
20 第1の閉断面構造部
21 ガセット(第1の荷重伝達板)
22 第2の閉断面構造部
23 第3の閉断面構造部
23a 第3の閉断面構造部の下端面
24 ウエザーストリップ(シール部材)
25 横リブ(第2の荷重伝達板)
Fs フロア側部
1 Front side member 8 Side sill 8a Sill inner panel (inside surface of side sill)
8r Rear end portion of side sill 9 Rear side member 9f Front end portion of rear side member 10 Front side member extension 10rid Front side member extension vehicle outer side ridge line 11 Extension member 11rid Extension member vehicle outer side ridge line 13 Battery housing recess 13a Lower side opening 13L Front side Battery storage recess 13Ls Car width direction side wall 13Lt Ceiling wall 13U Rear side battery storage recess 14 Battery tray 14a Peripheral frame 14c, 14d Tray side wall 14din Inner side wall of second closed cross-section structure portion 14dout Outside of second closed cross-section structure portion Wall 14dtop Upper end surface of second closed cross-section structure 16 Battery 19 Cross member 19e End of cross member in vehicle width direction 19f Front side wall 19r Rear side wall 20 First closed cross-section structure portion 21 Gusset ( 1 of the load transmission plate)
22 2nd closed cross-section structure part 23 3rd closed cross-section structure part 23a Lower end surface of 3rd closed cross-section structure part 24 Weather strip (seal member)
25 Lateral rib (second load transmission plate)
Fs floor side

Claims (8)

車幅方向両側に車両前後方向に延在する閉断面構造のサイドシルと、
左右のサイドシルの車幅方向内側面に跨って接合したフロアパネルと、
フロアパネルの中央部分を上方に膨出形成したバッテリ収納凹部と、
バッテリを収納し、前記バッテリ収納凹部の下側開口部の周縁部に取り付けて該バッテリを前記バッテリ収納凹部に配置したバッテリトレイと、を備えた車体下部構造であって、
前記バッテリ収納凹部の車幅方向側壁下部の外側隅部に沿って車両前後方向に延在する閉断面構造のエクステンションメンバと、
左右のサイドシルに跨って設けられ、バッテリ収納凹部の天井壁上面との間に閉断面を形成して車幅方向に延在する断面略逆U字状のクロスメンバと、を備え、
前記クロスメンバの車幅方向端部を、サイドシルの内側面上部からフロア一般面を経てバッテリ収納凹部の車幅方向側壁上部に至るフロア側部の断面形状に沿って接合して、該フロア側部に第1の閉断面構造部を形成したことを特徴とする車体下部構造。
A side sill with a closed cross section extending in the vehicle longitudinal direction on both sides in the vehicle width direction;
Floor panels joined across the inner side surfaces of the left and right side sills,
A battery housing recess formed by bulging the center portion of the floor panel upward;
A vehicle body lower structure including a battery, and a battery tray that is attached to a peripheral portion of a lower opening of the battery housing recess and the battery is disposed in the battery housing recess,
An extension member having a closed cross-sectional structure extending in the vehicle front-rear direction along the outer corner of the lower part of the side wall in the vehicle width direction of the battery housing recess;
A cross member that is provided across the left and right side sills and that forms a closed cross section between the upper surface of the ceiling wall of the battery housing recess and extends in the vehicle width direction, and has a substantially inverted U-shaped cross section;
Joining the end of the cross member in the vehicle width direction along the cross-sectional shape of the side of the floor from the upper part of the inner side surface of the side sill to the upper part of the side wall in the vehicle width direction of the battery housing recess. A vehicle body lower part structure characterized in that a first closed cross-section structure part is formed on the vehicle body.
第1の閉断面構造部の前後両側壁の内面とサイドシルの内側面とエクステンションメンバの上側面とに亘って、第1の閉断面構造部内を上下に分割するように第1の荷重伝達板を取り付けたことを特徴とする請求項1に記載の車体下部構造。   The first load transmitting plate is divided so as to vertically divide the inside of the first closed cross-section structure portion over the inner surfaces of the front and rear side walls of the first closed cross-section structure portion, the inner side surface of the side sill, and the upper side surface of the extension member. The vehicle body lower structure according to claim 1, wherein the vehicle body lower structure is attached. バッテリトレイは、下側周縁フレームをエクステンションメンバの閉断面下側に対応した部位に結合して取付けられ、該下側周縁フレームには、バッテリ収納凹部の車幅方向側壁の内側に沿って立上がるトレイ側壁部が設けられていて、該トレイ側壁部を、下方から上方に向かって車幅方向間隔が徐々に狭くなる第2の閉断面構造部として形成したことを特徴とする請求項1または2に記載の車体下部構造。   The battery tray is attached by connecting the lower peripheral frame to a portion corresponding to the lower closed cross section of the extension member, and rises along the inner side of the side wall in the vehicle width direction of the battery storage recess. 3. A tray side wall portion is provided, and the tray side wall portion is formed as a second closed cross-section structure portion in which the distance in the vehicle width direction gradually decreases from below to above. The vehicle body lower structure as described in 2. バッテリ収納凹部の車幅方向側壁と天井壁との間に形成される内側上隅部に、前記第2の閉断面構造部の上端面に対向する第3の閉断面構造部を設け、この第3の閉断面構造部の下端面と第2の閉断面構造部の上端面との間にシール部材を配設したことを特徴とする請求項3に記載の車体下部構造。   A third closed cross-section structure portion facing the upper end surface of the second closed cross-section structure portion is provided at an inner upper corner portion formed between the vehicle width direction side wall and the ceiling wall of the battery housing recess, The vehicle body lower structure according to claim 3, wherein a seal member is disposed between a lower end surface of the third closed cross-section structure portion and an upper end surface of the second closed cross-section structure portion. 前記トレイ側壁部の第2の閉断面構造部内に、エクステンションメンバの上側面に対応した位置で内外側壁を連結する第2の荷重伝達板を取り付けたことを特徴とする請求項3または4に記載の車体下部構造。   5. The second load transmission plate for connecting the inner and outer walls at a position corresponding to the upper side surface of the extension member is attached in the second closed cross-section structure portion of the tray side wall portion. Car body lower structure. エクステンションメンバと、フロアパネルの上面に接合されてこのエクステンションメンバの車両前側に配置されたフロントサイドメンバエクステンションと、のそれぞれの車外側稜線を繋げるとともに、リヤサイドメンバの前端部をサイドシルの後端部の内側面に結合したことを特徴とする請求項1〜5のいずれか1つに記載の車体下部構造。   The extension member and the front side member extension that is joined to the upper surface of the floor panel and arranged on the vehicle front side of the extension member are connected to each other, and the front end of the rear side member is connected to the rear end of the side sill. The vehicle body lower structure according to any one of claims 1 to 5, wherein the vehicle body lower structure is coupled to an inner side surface. クロスメンバは、バッテリ収納凹部の形成範囲で車両前後方向に適宜間隔をおいて複数本配設したことを特徴とする請求項1〜6のいずれか1つに記載の車体下部構造。   The vehicle body lower structure according to any one of claims 1 to 6, wherein a plurality of cross members are arranged at an appropriate interval in the vehicle front-rear direction within a range in which the battery housing recess is formed. バッテリトレイの車幅方向端部の車体側取付点を、複数本のクロスメンバの車幅方向軸線上にそれぞれ設定したことを特徴とする請求項7に記載の車体下部構造。   The vehicle body lower part structure according to claim 7, wherein the vehicle body side attachment point at the vehicle width direction end of the battery tray is set on the vehicle width direction axis of the plurality of cross members.
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