JP7373138B2 - Vehicle undercarriage structure - Google Patents

Vehicle undercarriage structure Download PDF

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JP7373138B2
JP7373138B2 JP2022187399A JP2022187399A JP7373138B2 JP 7373138 B2 JP7373138 B2 JP 7373138B2 JP 2022187399 A JP2022187399 A JP 2022187399A JP 2022187399 A JP2022187399 A JP 2022187399A JP 7373138 B2 JP7373138 B2 JP 7373138B2
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vehicle
cross member
joined
width direction
side member
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JP2023010970A (en
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桂介 河合
晋栄 望月
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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
    • B62D25/08—Front or rear portions
    • 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
    • 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

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Body Structure For Vehicles (AREA)
  • Arrangement Or Mounting Of Propulsion Units For Vehicles (AREA)

Description

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

従来の車両下部構造の中には、車両幅方向に延びるリヤシートクロスメンバと、車両前後方向に延び、車両幅方向にずれて位置するフロントフロアサイドメンバ及びリヤフロアサイドメンバを備えているものがある。そして、この車両下部構造においては、リヤシートクロスメンバがリヤフロアサイドメンバの前部とフロントフロアサイドメンバの後部とにそれぞれ接続されており、リヤフロアサイドメンバと接続されるリヤシートクロスメンバの車両幅方向外側の側部領域にビード部を設けることによって、車両側方からの衝撃荷重の入力に対して座屈変形を促すようにしている（例えば、特許文献１参照）。 Some conventional vehicle lower structures include a rear seat cross member that extends in the vehicle width direction, and a front floor side member and a rear floor side member that extend in the vehicle longitudinal direction and are offset in the vehicle width direction. In this vehicle lower structure, the rear seat cross member is connected to the front part of the rear floor side member and the rear part of the front floor side member. By providing a bead portion in the side region, buckling deformation is promoted in response to impact load input from the side of the vehicle (see, for example, Patent Document 1).

特開２０１６－１０７８９２号公報Japanese Patent Application Publication No. 2016-107892

このように、上述した従来の車両下部構造では、座屈変形を促すビード部を有するリヤシートクロスメンバの車両幅方向外側の側部領域にリヤフロアサイドメンバが接続されているので、車体剛性が低下することとなり、車体へ衝撃荷重が入力された場合に、フロアサイドメンバなどの車体骨格部材への荷重の伝達が不十分になるという問題を有していた。 As described above, in the conventional vehicle lower structure described above, the rear floor side member is connected to the outer side region in the vehicle width direction of the rear seat cross member that has a bead portion that promotes buckling deformation, resulting in a decrease in vehicle body rigidity. Therefore, when an impact load is input to the vehicle body, there is a problem in that the load is insufficiently transmitted to the vehicle body frame members such as the floor side members.

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、入力された荷重の車両前後方向への伝達と荷重の分散を促進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 view of the above-mentioned circumstances, and its purpose is to provide a vehicle lower structure capable of promoting the transmission of input loads in the longitudinal direction of the vehicle and the dispersion of the loads. It is in.

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シルと、該サイドシルの車両内側に隣接して配置され、車両前後方向に延びる左右一対のサイドメンバと、前記フロアパネルの下方に設けられ、車両幅方向に延びる下側クロスメンバとを有する車両下部構造において、前記下側クロスメンバには、該下側クロスメンバの車両幅方向外側の端部に接合される端部材が設けられ、前記端部材は、前記サイドシルおよび前記サイドメンバに接合されている。 In order to solve the problems of the prior art described above, the present invention provides a pair of left and right side sills that are provided on the side portions of a floor panel in the vehicle width direction and extend in the longitudinal direction of the vehicle; , a vehicle lower structure including a pair of left and right side members extending in the longitudinal direction of the vehicle, and a lower cross member provided below the floor panel and extending in the vehicle width direction; An end member is provided to be joined to an outer end in the vehicle width direction of the cross member, and the end member is joined to the side sill and the side member.

本発明の車両下部構造においては、外部から荷重がサイドシルなどに入力された場合に、当該入力荷重の車両前後方向への伝達を促進することができる。
しかも、本発明の車両下部構造では、下側クロスメンバに接合された端部材などによって車両幅方向及び車両前後方向に対する剛性が向上したサイドメンバに外部からの荷重が入力されることになるので、荷重の分散を促進することができる。 In the vehicle lower structure of the present invention, when a load is input from the outside to a side sill or the like, it is possible to promote transmission of the input load in the longitudinal direction of the vehicle.
Moreover, in the vehicle lower structure of the present invention, an external load is input to the side member whose rigidity in the vehicle width direction and the vehicle longitudinal direction is improved by the end member etc. joined to the lower cross member. Load distribution can be promoted.

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、サイドシル、サイドメンバ、電源部材及びクロスメンバを車両斜め下方から見た斜視図である。1 is a perspective view of a floor panel, a side sill, a side member, a power supply member, and a cross member in a vehicle lower structure according to an embodiment of the present invention, as viewed diagonally from below the vehicle. 図１におけるＺ部を拡大したものであり、電源部材を取り除いた状態で示す斜視図である。FIG. 2 is an enlarged perspective view of the Z section in FIG. 1 with a power supply member removed. 図１におけるフロアパネルの下方に設けられる下側クロスメンバの端部材及びその周辺部を、電源部材及びクロスメンバを取除いた状態で車両斜め下方から見た拡大斜視図である。FIG. 2 is an enlarged perspective view of the end member of the lower cross member provided below the floor panel in FIG. 1 and its surroundings, as seen diagonally from below the vehicle, with the power supply member and the cross member removed. 図３における下側クロスメンバの端部材及びその周辺部を示す平面図である。It is a top view which shows the end member of the lower cross member in FIG. 3, and its peripheral part. 図３における下側クロスメンバの端部材及びその周辺部をリヤサイドメンバを省略して車両後側斜め下方から見た斜視図である。FIG. 4 is a perspective view of the end member of the lower cross member in FIG. 3 and its surroundings as viewed diagonally from below on the rear side of the vehicle with the rear side member omitted. 図３における下側クロスメンバの端部材及びその周辺部を車両前側斜め下方から見た斜視図である。FIG. 4 is a perspective view of the end member of the lower cross member in FIG. 3 and its surroundings, viewed obliquely from below on the front side of the vehicle. 図３における下側クロスメンバの端部材及びその周辺部を車両側方の外側から見た側面図である。FIG. 4 is a side view of the end member of the lower cross member in FIG. 3 and its surroundings, viewed from the outside of the vehicle side.

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Ｌ方向は車両下方を示し、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。 DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on illustrated embodiments.
In the figure, the direction of arrow Fr indicates the front of the vehicle, the direction of arrow L indicates the downward direction of the vehicle, and the direction of arrow I indicates the inside of the vehicle in the width direction. Further, the arrow X direction indicates the vehicle width direction, and the arrow Y direction indicates the vehicle longitudinal 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及び図２に示すように、車両幅方向及び車両前後方向に展開し、車両前後方向に沿って車両前後に配置され、フロアパネルを構成するフロントフロアパネル１及びリヤフロアパネル２と、これらフロントフロアパネル１及びリヤフロアパネル２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シル３と、該サイドシル３の車両内側に隣接して配置され、車両前後方向に延びる左右一対のサイドメンバ４と、フロントフロアパネル１及びリヤフロアパネル２の下方に設けられ、車両幅方向に延びる下側クロスメンバ５とを有しており、フロントフロアパネル１は、車両上下方向でリヤフロアパネル２よりも低い位置に設けられている。 1 to 7 show a vehicle lower structure according to an embodiment of the present invention. As shown in FIGS. 1 and 2, the vehicle lower structure of the present embodiment is a front floor panel that extends in the vehicle width direction and the vehicle longitudinal direction, is arranged at the front and rear of the vehicle along the vehicle longitudinal direction, and constitutes a floor panel. 1 and rear floor panel 2; a pair of left and right side sills 3 provided on the vehicle width direction side portions of these front floor panel 1 and rear floor panel 2 and extending in the longitudinal direction of the vehicle; , a pair of left and right side members 4 extending in the longitudinal direction of the vehicle, and a lower cross member 5 provided below the front floor panel 1 and rear floor panel 2 and extending in the vehicle width direction. , is provided at a position lower than the rear floor panel 2 in the vehicle vertical direction.

本実施形態のフロントフロアパネル１は、図６に示すように、車両幅方向外側に位置し、サイドシル３と接合するフロア側面部１１と、該フロア側面部１１より車両幅方向内側に位置し、車両内側へ向かって上り傾斜するフロア傾斜面部１２と、該フロア傾斜面部１２の車両幅方向内側に位置し、車両幅方向に平坦なフロア中央面部１３とを有している。そのため、フロントフロアパネル１は、車両上方へ底上げされた構造となっており、フロア中央面部１３は、フロア側面部１１及びフロア傾斜面部１２よりも高い位置に設けられている。
そして、本実施形態の車両下部構造において、サイドシル３は、図１～図７に示すように、車両前後の位置に設けられ、端部が互いに接合されるフロントサイドシル３１とリヤサイドシル３２を有している。また、サイドメンバ４は、車両前後の位置に設けられるフロントサイドメンバ４１及びリヤサイドメンバ４２を有しており、下側クロスメンバ５は、左右一対のフロントサイドメンバ４１に接合されている。しかも、リヤサイドメンバ４２は、車両後方へ向かうほど車両内側に位置するように延びており、車両前後方向の中間部分に位置する後述の下面部４２ｂには、サスペンションアーム取付部４０が接合されて設けられており、該サスペンションアーム取付部４０は、リヤサイドシル３２の側面にも接合されている。 As shown in FIG. 6, the front floor panel 1 of this embodiment includes a floor side part 11 located on the outside in the vehicle width direction and joined to the side sill 3, and a floor side part 11 located on the inside of the floor side part 11 in the vehicle width direction. It has a floor inclined surface portion 12 that slopes upward toward the inside of the vehicle, and a floor center surface portion 13 that is located inside the floor inclined surface portion 12 in the vehicle width direction and is flat in the vehicle width direction. Therefore, the front floor panel 1 has a structure in which the bottom is raised upwards of the vehicle, and the floor center surface portion 13 is provided at a higher position than the floor side portions 11 and the floor inclined surface portions 12.
In the vehicle lower structure of this embodiment, the side sill 3 includes a front side sill 31 and a rear side sill 32, which are provided at the front and rear positions of the vehicle and whose ends are joined to each other, as shown in FIGS. 1 to 7. ing. Further, the side member 4 includes a front side member 41 and a rear side member 42 provided at the front and rear positions of the vehicle, and the lower cross member 5 is joined to the pair of left and right front side members 41. Moreover, the rear side member 42 extends so as to be located inward of the vehicle as it goes toward the rear of the vehicle, and a suspension arm attachment portion 40 is connected to and provided on a lower surface portion 42b, which will be described later, located at an intermediate portion in the longitudinal direction of the vehicle. The suspension arm attachment portion 40 is also joined to the side surface of the rear side sill 32.

また、本実施形態の下側クロスメンバ５には、図２～図７に示すように、下側クロスメンバ５の車両幅方向外側に配置される端部材６が設けられており、該端部材６の内側端部は、下側クロスメンバ５の車両幅方向外側の端部に接合されている。そして、本実施形態の端部材６は、サイドシル３のフロントサイドシル３１及びリヤサイドシル３２と、サイドメンバ４のフロントサイドメンバ４１及びリヤサイドメンバ４２に接合されており、フロントサイドメンバ４１の後端部４１ａとリヤサイドメンバ４２の前端部４２ａとは、車両前方視で重なり合うように配置されている。すなわち、リヤサイドメンバ４２は、車両幅方向及び車両前後方向に対する剛性が向上した構造に構成されている。しかも、端部材６は、サイドシル３及びサイドメンバ４の形状と対応した形状に屈曲形成されており、これによって、接合するサイドシル３及びサイドメンバ４に重ね合わせることが可能な構造となっている。
また、本実施形態の車両下部構造は、サイドシル３及びサイドメンバ４に加わった荷重が車両前後方向へ円滑に伝達され、かつ、車両幅方向及び車両前後方向に対する剛性が向上したリヤサイドメンバ４２に荷重が入力されることになるため、荷重の分散が促進されるようになっている。さらに、リヤサイドメンバ４２の剛性が向上することに伴って、サスペンションアーム取付部４０からリヤサイドメンバ４２に入力される振動が低減され、フロア振動及びロードノイズが改善されることになる。なお、端部材６が下側クロスメンバ５と別部材で形成されていると、板厚を変更することによりサイドシル３及びサイドメンバ４との接合部における剛性のコントロールが容易となる上、成形加工が簡単となる。 Further, as shown in FIGS. 2 to 7, the lower cross member 5 of this embodiment is provided with an end member 6 disposed on the outer side of the lower cross member 5 in the vehicle width direction. The inner end of the cross member 6 is joined to the outer end of the lower cross member 5 in the vehicle width direction. The end member 6 of this embodiment is joined to the front side sill 31 and rear side sill 32 of the side sill 3 and the front side member 41 and rear side member 42 of the side member 4, and is joined to the rear end portion 41a of the front side member 41. and the front end portion 42a of the rear side member 42 are arranged so as to overlap when viewed from the front of the vehicle. That is, the rear side member 42 has a structure with improved rigidity in the vehicle width direction and vehicle longitudinal direction. Furthermore, the end member 6 is bent to have a shape corresponding to the shapes of the side sill 3 and side member 4, and thereby has a structure that allows it to be overlapped with the side sill 3 and side member 4 to be joined.
In addition, in the vehicle lower structure of this embodiment, the load applied to the side sill 3 and the side member 4 is smoothly transmitted in the vehicle longitudinal direction, and the load is transferred to the rear side member 42, which has improved rigidity in the vehicle width direction and the vehicle longitudinal direction. is input, which facilitates load distribution. Furthermore, as the rigidity of the rear side member 42 is improved, vibrations input from the suspension arm mounting portion 40 to the rear side member 42 are reduced, and floor vibration and road noise are improved. Note that if the end member 6 is formed as a separate member from the lower cross member 5, the rigidity at the joint with the side sill 3 and the side member 4 can be easily controlled by changing the plate thickness, and the molding process can be easily controlled. becomes easy.

本実施形態の端部材６は、図３～図７に示すように、車両前方側がフロントサイドメンバ４１に接合されており、端部材６の車両後方側には、サイドシル３のリヤサイドシル３２に接合される後壁６１を有している。そして、端部材６とリヤサイドメンバ４２とは、後壁６１とリヤサイドメンバ４２とが重なり合った状態で、接合されている。この後壁６１は、車両前後方向及び車両上下方向に延びており、端部材６の後壁６１がリヤサイドシル３２と接合されることによって、端部材６の車両幅方向及び車両上下方向に対する剛性が向上するように構成されている。また、高い剛性を有する端部材６がサイドシル３のフロントサイドシル３１及びリヤサイドシル３２に接合されることによって、より一層剛性が向上した構造が得られるようになっている。さらに、端部材６の後壁６１が位置する箇所には、図７に示すように、車両内側及び車両外側に車両後方へ延びる側壁部７ａを有するバルク部材７が車両上下方向に沿って配置されており、このバルク部材７の側壁部７ａは、リヤサイドメンバ４２に接合されているとともに、後壁６１及びリヤサイドシル３２に接合されている。これによって、端部材６の後壁６１が位置する箇所は、更に剛性が高められた構造となっている。
なお、リヤサイドメンバ４２は、フロントサイドメンバ４１に比べて端部材６と接合される断面積が大きいが、後壁６１を介してリヤサイドメンバ４２に接合されているため、フロントサイドメンバ４１との接合断面積に影響されない構造となっている。 As shown in FIGS. 3 to 7, the end member 6 of this embodiment has a vehicle front side joined to a front side member 41, and a vehicle rear side of the end member 6 joined to a rear side sill 32 of the side sill 3. It has a rear wall 61. The end member 6 and the rear side member 42 are joined together with the rear wall 61 and the rear side member 42 overlapping each other. This rear wall 61 extends in the vehicle longitudinal direction and the vehicle vertical direction, and by joining the rear wall 61 of the end member 6 to the rear side sill 32, the rigidity of the end member 6 in the vehicle width direction and the vehicle vertical direction is increased. It is designed to improve. Further, by joining the end member 6 having high rigidity to the front side sill 31 and rear side sill 32 of the side sill 3, a structure with further improved rigidity can be obtained. Further, at the location where the rear wall 61 of the end member 6 is located, as shown in FIG. 7, a bulk member 7 having side wall portions 7a extending toward the rear of the vehicle on the inside and outside of the vehicle is arranged along the vehicle vertical direction. The side wall portion 7a of the bulk member 7 is joined to the rear side member 42, as well as to the rear wall 61 and the rear side sill 32. As a result, the portion where the rear wall 61 of the end member 6 is located has a structure with further increased rigidity.
Although the rear side member 42 has a larger cross-sectional area where it is joined to the end member 6 than the front side member 41, since it is joined to the rear side member 42 via the rear wall 61, the joint with the front side member 41 is smaller. It has a structure that is not affected by the cross-sectional area.

また、本実施形態の端部材６の後壁６１は、図３及び図５に示すように、下側クロスメンバ５の車両後方側に位置する後側段差壁５１で接合される後側接合部６１ａ有しており、後壁６１の下側角部には、後側稜線Ｒ１が車両幅方向に沿って滑らかに延びている。しかも、後側段差壁５１は、フロントフロアパネル１の車両幅方向内側に位置する平坦なフロア中央面部１３まで延びている。これにより、端部材６に入力される荷重は、下側クロスメンバ５の後側段差壁５１に伝達されることになる。さらに、後壁６１は、車両幅方向及び車両上下方向に対して高い剛性を有し、かつ後側段差壁５１にも接合されるため、車両幅方向及び車両上下方向に対してより一層高い剛性を有することになる。そして、下側クロスメンバ５の剛性が向上することに伴って、リヤサイドメンバ４２の剛性も向上することになる。
一方、端部材６の車両前方側には、図３～図６に示すように、車両上下方向に延びる前壁６２が形成されており、該前壁６２は、下側クロスメンバ５の車両前方側に位置する前側段差壁５２で接合される前側接合部６２ａ有している。そして、前壁６２の下側角部には、前側稜線Ｒ２が車両幅方向に沿って滑らかに延びているとともに、フロントサイドメンバ４１に沿うように延びている。 Further, as shown in FIGS. 3 and 5, the rear wall 61 of the end member 6 of this embodiment has a rear joint portion joined by a rear step wall 51 of the lower cross member 5 located on the rear side of the vehicle. 61a, and at the lower corner of the rear wall 61, a rear ridge line R1 extends smoothly along the vehicle width direction. Furthermore, the rear step wall 51 extends to the flat floor center surface portion 13 located on the inside of the front floor panel 1 in the vehicle width direction. Thereby, the load input to the end member 6 is transmitted to the rear step wall 51 of the lower cross member 5. Furthermore, the rear wall 61 has high rigidity in the vehicle width direction and the vehicle vertical direction, and is also joined to the rear step wall 51, so it has even higher rigidity in the vehicle width direction and the vehicle vertical direction. will have the following. As the rigidity of the lower cross member 5 improves, the rigidity of the rear side member 42 also improves.
On the other hand, a front wall 62 extending in the vehicle vertical direction is formed on the vehicle front side of the end member 6, as shown in FIGS. It has a front joint part 62a joined by the front step wall 52 located on the side. At the lower corner of the front wall 62, a front ridge line R2 extends smoothly along the vehicle width direction and also extends along the front side member 41.

また、本実施形態の車両下部構造において、下側クロスメンバ５は、図３～図６に示すように、フロントサイドメンバ４１よりも車両上方に配置されており、下側クロスメンバとフロントサイドメンバ４１とが接合されるフロントフロアパネル１の境界部分には、フロントサイドメンバ４１から車両内側へ向かって上り傾斜するフロア傾斜面部１２が設けられている。一方、端部材６は、下側クロスメンバ５に向かって延出する延出部６３を有しており、該延出部６３は、フロア傾斜面部１２の位置で下側クロスメンバ５と接合している。すなわち、延出部６３がフロア傾斜面部１２の範囲内に位置するため、フロントサイドメンバ４１が下側クロスメンバ５及び端部材６によって車両下方から支持されることになる。 Furthermore, in the vehicle lower structure of this embodiment, the lower cross member 5 is arranged above the front side member 41 of the vehicle, as shown in FIGS. A floor inclined surface section 12 that slopes upward from the front side member 41 toward the inside of the vehicle is provided at the boundary portion of the front floor panel 1 where the front floor panel 1 is joined to the front side member 41 . On the other hand, the end member 6 has an extending portion 63 extending toward the lower cross member 5, and the extending portion 63 is joined to the lower cross member 5 at the floor slope portion 12. ing. That is, since the extending portion 63 is located within the range of the floor inclined surface portion 12, the front side member 41 is supported by the lower cross member 5 and the end member 6 from below the vehicle.

さらに、本実施形態の車両下部構造において、フロア傾斜面部１２に位置する延出部６３は、図３～図６に示すように、車両外側に向かうほど車両下側に勾配する勾配部分６３ａを有しており、該勾配部分６３ａは、フロントサイドメンバ４１（またはリヤサイドメンバ４２）まで連続して形成されている。これにより、下側クロスメンバ５がフロントサイドメンバ４１（またはリヤサイドメンバ４２）を支持する剛性が車両幅方向だけでなく、車両上下方向に対しても高められるようになっている。 Furthermore, in the vehicle lower structure of the present embodiment, the extension portion 63 located on the floor inclined surface portion 12 has a slope portion 63a that slopes toward the bottom of the vehicle toward the outside of the vehicle, as shown in FIGS. 3 to 6. The slope portion 63a is formed continuously up to the front side member 41 (or rear side member 42). Thereby, the rigidity with which the lower cross member 5 supports the front side member 41 (or the rear side member 42) is increased not only in the vehicle width direction but also in the vehicle vertical direction.

本実施形態の車両下部構造において、フロントフロアパネル１及びリヤフロアパネル２の下方には、図１に示すように、電源部材（例えば、バッテリ等）１０が設けられている。すなわち、フロントフロアパネル１は、フロア中央面部１３の箇所が車両上方へ底上げされ、フロア中央面部１３の高さ位置がフロア側面部１１及びフロア傾斜面部１２よりも車両上方に位置しており、電源部材１０は、フロア中央面部１３の下方に形成された空間内に収納されて搭載可能に構成されている。しかも、フロア中央面部１３の下方の空間内に収納された状態の電源部材１０は、車両側方視でサイドシル３のフロントサイドシル３１及びリヤサイドシル３２と重なり合うように配置されているとともに、車両幅方向に延びる複数本のクロスメンバ８によって支持されている。そのため、フロントフロアパネル１が底上げされた構造であっても、側突時の衝撃荷重から電源部材１０を保護できる構造となっている。なお、クロスメンバ８は、電源部材１０の車両幅方向の寸法よりも長く形成され、かつ、電源部材１０の車両前後方向の長さに対応可能な本数が使用され、車両前後方向に所定の間隔を空けて配置されている。
一方、本実施形態のリヤサイドメンバ４２には、クロスメンバ８の車両幅方向の端部８ａを締結部材などで接合するクロスメンバ接合部４２Ａが設けられており、該クロスメンバ接合部４２Ａは、車両下方視でサイドシル３の車両前後方向の範囲に配置されている。すなわち、本実施形態の車両下部構造では、車両前方から車両後方へ向かって、端部材６、クロスメンバ接合部４２Ａ、サスペンションアーム取付部４０の順に配置されていることになる。
これによって、クロスメンバ８の端部８ａは、クロスメンバ接合部４２Ａを介してリヤサイドメンバ４２に接合されるため、リヤサイドメンバ４２の車両幅方向に対する剛性を向上させる構造が得られることになる。しかも、クロスメンバ接合部４２Ａは、サイドシル３の車両前後方向の範囲に配置されており、車両幅方向の両側から剛性部材をリヤサイドメンバ４２に接合するような構造となっている。 In the vehicle lower structure of this embodiment, a power source member (for example, a battery, etc.) 10 is provided below the front floor panel 1 and the rear floor panel 2, as shown in FIG. That is, in the front floor panel 1, the floor center surface portion 13 is raised upwards of the vehicle, the height position of the floor center surface portion 13 is located above the vehicle than the floor side portions 11 and the floor inclined surface portion 12, and the power supply The member 10 is configured to be housed and mounted within a space formed below the floor center surface portion 13. Moreover, the power supply member 10 stored in the space below the floor center surface portion 13 is arranged so as to overlap the front side sill 31 and rear side sill 32 of the side sill 3 when viewed from the side of the vehicle, and is arranged so as to overlap with the front side sill 31 and rear side sill 32 of the side sill 3 when viewed from the side of the vehicle. It is supported by a plurality of cross members 8 extending from one side to the other. Therefore, even if the front floor panel 1 has a raised bottom structure, the power supply member 10 can be protected from the impact load at the time of a side collision. Note that the cross members 8 are formed to be longer than the dimension of the power source member 10 in the vehicle width direction, and are used in a number that can correspond to the length of the power source member 10 in the vehicle longitudinal direction, and are spaced at a predetermined interval in the vehicle longitudinal direction. It is placed with a space between.
On the other hand, the rear side member 42 of this embodiment is provided with a cross member joint 42A that joins the end 8a of the cross member 8 in the vehicle width direction with a fastening member or the like. It is arranged in the range of the side sill 3 in the longitudinal direction of the vehicle when viewed from below. That is, in the vehicle lower structure of this embodiment, the end member 6, the cross member joint portion 42A, and the suspension arm mounting portion 40 are arranged in this order from the front of the vehicle toward the rear of the vehicle.
As a result, the end portion 8a of the cross member 8 is joined to the rear side member 42 via the cross member joining portion 42A, so that a structure that improves the rigidity of the rear side member 42 in the vehicle width direction is obtained. In addition, the cross member joint portion 42A is disposed within the range of the side sill 3 in the vehicle longitudinal direction, and has a structure in which the rigid member is joined to the rear side member 42 from both sides in the vehicle width direction.

また、本実施形態の車両下部構造において、リヤサイドメンバ４２は、図３及び図４に示すように、車両下方に位置する下面部４２ｂと、車両幅方向に位置する側面部４２ｃを有している。そして、クロスメンバ接合部４２Ａには、クロスメンバ接合部ブラケット４３が設けられており、該クロスメンバ接合部ブラケット４３は、リヤサイドメンバ４２の下面部４２ｂ及び側面部４２ｃに接合されている。そのため、クロスメンバ接合部ブラケット４３は、クロスメンバ８の端部８ａを接合する上面が四角形状を有し、かつ周囲の側壁が車両上下方向に延びており、車両内側の上部４３ａは、リヤサイドメンバ４２の側面部４２ｃまで延びて重ね合わされ、車両前後側の上部４３ｂ，４３ｃ及び車両外側の上部４３ｄはリヤサイドメンバ４２の下面部４２ｂに沿って折り曲げられて重ね合されるように形成され、重ね合わせ部が接合されるように構成されている。
そのため、本実施形態の車両下部構造においては、クロスメンバ接合部ブラケット４３がリヤサイドメンバ４２の下面部４２ｂに接合されることにより、車両幅方向及び車両前後方向に対する剛性が向上し、また、クロスメンバ接合部ブラケット４３がリヤサイドメンバ４２の側面部４２ｃに接合されることにより、車両前後方向及び車両上下方向に対する剛性が向上することになり、リヤサイドメンバ４２への荷重伝達が促進されるようになっている。 Further, in the vehicle lower structure of this embodiment, the rear side member 42 has a lower surface portion 42b located below the vehicle and a side surface portion 42c located in the vehicle width direction, as shown in FIGS. 3 and 4. . A cross member joint bracket 43 is provided at the cross member joint portion 42A, and the cross member joint bracket 43 is joined to the lower surface portion 42b and side surface portion 42c of the rear side member 42. Therefore, the cross member joint bracket 43 has a rectangular upper surface that joins the end 8a of the cross member 8, and the surrounding side walls extend in the vehicle vertical direction, and the upper part 43a on the inside of the vehicle is connected to the rear side member. The upper parts 43b, 43c on the front and rear sides of the vehicle and the upper part 43d on the outer side of the vehicle are bent along the lower surface part 42b of the rear side member 42 and overlapped. The parts are connected to each other.
Therefore, in the vehicle lower structure of the present embodiment, the cross member joint bracket 43 is joined to the lower surface portion 42b of the rear side member 42, thereby improving the rigidity in the vehicle width direction and vehicle longitudinal direction. By joining the joint bracket 43 to the side surface 42c of the rear side member 42, rigidity in the vehicle longitudinal direction and vehicle vertical direction is improved, and load transmission to the rear side member 42 is promoted. There is.

さらに、本実施形態の車両下部構造において、クロスメンバ接合部４２Ａの車両幅方向外側には、図２～図４に示すように、ジャッキアップブラケット９が設けられており、該ジャッキアップブラケット９は、リヤサイドシル３２及びリヤサイドメンバ４２に接合されている。これによって、各種部材の接合部がクロスメンバ接合部４２Ａの設置範囲に集中することになり、クロスメンバ接合部４２Ａの周辺部の車両幅方向に対する剛性が向上し、クロスメンバ接合部４２Ａの周辺部の荷重伝達が促進される構造が得られることになる。 Furthermore, in the vehicle lower structure of this embodiment, a jack-up bracket 9 is provided on the outside of the cross member joint portion 42A in the vehicle width direction, as shown in FIGS. , are joined to the rear side sill 32 and the rear side member 42. As a result, the joints of various members are concentrated in the installation range of the cross member joint 42A, the rigidity of the peripheral part of the cross member joint 42A in the vehicle width direction is improved, and the peripheral part of the cross member joint 42A is This results in a structure that promotes load transmission.

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（フロントフロアパネル１及びリヤフロアパネル２）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シル３と、サイドシル３の車両内側に隣接して配置され、車両前後方向に延びる左右一対のサイドメンバ４と、フロアパネル１，２の下方に設けられ、車両幅方向に延びる下側クロスメンバ５とを有している。サイドメンバ４は、車両前後の位置に設けられるフロントサイドメンバ４１及びリヤサイドメンバ４２を有しており、下側クロスメンバ５は、左右一対のフロントサイドメンバ４１に接合されている。また、下側クロスメンバ５には、下側クロスメンバ５の車両幅方向外側の端部に接合される端部材６が設けられており、端部材６は、サイドシル３、フロントサイドメンバ４１及びリヤサイドメンバ４２に接合されている。そして、フロントサイドメンバ４１の後端部４１ａとリヤサイドメンバ４２の前端部４２ａとは、車両前方視で重なり合うように配置されている。
したがって、本実施形態の車両下部構造においては、下側クロスメンバ５に接合された端部材６がサイドシル３、フロントサイドメンバ４１及びリヤサイドメンバ４２のそれぞれと接合され、フロントサイドメンバ４１の後端部４１ａとリヤサイドメンバ４２の前端部４２ａとが、車両前方視で重なり合っているので、車両側方などから荷重がサイドシル３等に入力された場合に、当該入力荷重を車両前後方向へ迅速かつ確実に伝達でき、車両前後方向の荷重伝達を促進することができる。
また、本実施形態の車両下部構造では、下側クロスメンバ５に接合された端部材６によってリヤサイドメンバ４１の車両幅方向及び車両前後方向に対する剛性が向上しており、当該高剛性のリヤサイドメンバ４１に外部からの荷重が入力されることになるので、荷重の分散効果を高めることができる。 As described above, the vehicle lower structure according to the embodiment of the present invention includes a pair of left and right side sills 3 that are provided on the vehicle width direction sides of the floor panels (front floor panel 1 and rear floor panel 2) and extend in the vehicle longitudinal direction; It includes a pair of left and right side members 4 that are arranged adjacent to the inside of the vehicle of the side sill 3 and extend in the longitudinal direction of the vehicle, and a lower cross member 5 that is provided below the floor panels 1 and 2 and extends in the vehicle width direction. ing. The side member 4 includes a front side member 41 and a rear side member 42 provided at the front and rear positions of the vehicle, and the lower cross member 5 is joined to the pair of left and right front side members 41. Further, the lower cross member 5 is provided with an end member 6 that is joined to the outer end of the lower cross member 5 in the vehicle width direction. It is joined to member 42. The rear end portion 41a of the front side member 41 and the front end portion 42a of the rear side member 42 are arranged to overlap when viewed from the front of the vehicle.
Therefore, in the vehicle lower structure of this embodiment, the end member 6 joined to the lower cross member 5 is joined to each of the side sill 3, the front side member 41, and the rear side member 42, and the rear end of the front side member 41 41a and the front end 42a of the rear side member 42 overlap when viewed from the front of the vehicle, so when a load is input to the side sill 3 etc. from the side of the vehicle, the input load can be quickly and reliably transferred in the longitudinal direction of the vehicle. It is possible to promote load transmission in the longitudinal direction of the vehicle.
Furthermore, in the vehicle lower structure of the present embodiment, the end member 6 joined to the lower cross member 5 improves the rigidity of the rear side member 41 in the vehicle width direction and the vehicle longitudinal direction. Since an external load is input to the , the load dispersion effect can be enhanced.

また、本実施形態の車両下部構造において、端部材６は、車両前方側がフロントサイドメンバ４１に接合され、端部材６の車両後方側には、サイドシル３に接合される後壁６１を有しており、端部材６とリヤサイドメンバ４２とは、後壁６１とリヤサイドメンバ４２とが重なり合った状態で、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、端部材６の車両幅方向及び車両上下方向に対する剛性が向上することになるので、高剛性の端部材６をサイドシル３のフロントサイドシル３１及びリヤサイドシル３２に接合させることによって、より一層の剛性向上を図ることができ、入力荷重の周辺部品への伝達及び分散を効果的に行うことができる。 Furthermore, in the vehicle lower structure of this embodiment, the end member 6 has a front side of the vehicle joined to the front side member 41, and a rear wall 61 joined to the side sill 3 on the rear side of the end member 6. The end member 6 and the rear side member 42 are joined together with the rear wall 61 and the rear side member 42 overlapping each other.
Therefore, in the vehicle lower structure of this embodiment, the rigidity of the end member 6 in the vehicle width direction and the vehicle vertical direction is improved, so the highly rigid end member 6 is attached to the front side sill 31 and rear side sill 32 of the side sill 3. By joining, the rigidity can be further improved, and input loads can be effectively transmitted and dispersed to surrounding parts.

そして、本実施形態の車両下部構造において、端部材６の後壁６１は、下側クロスメンバ５の車両後部側に位置する後側段差壁５１で接合される後側接合部６１ａを有しており、後側段差壁５１は、フロアパネルであるフロントフロアパネル１の車両幅方向内側に位置する平坦なフロア中央面部１３まで延びている。
したがって、本実施形態の車両下部構造によれば、端部材６に入力される荷重を下側クロスメンバ５の後側段差壁５１に円滑に伝達させることができる。また、後壁６１は、車両幅方向及び車両上下方向に対して高い剛性を有し、かつ後側段差壁５１にも接合されるため、車両幅方向及び車両上下方向に対して更なる剛性向上を図ることができる。しかも、下側クロスメンバ５の剛性が向上することによって、リヤサイドメンバ４２の剛性もより一層高めることができる。 In the vehicle lower structure of this embodiment, the rear wall 61 of the end member 6 has a rear joint portion 61a joined to the rear step wall 51 of the lower cross member 5 located on the rear side of the vehicle. The rear stepped wall 51 extends to a flat floor center surface portion 13 located on the inside in the vehicle width direction of the front floor panel 1, which is a floor panel.
Therefore, according to the vehicle lower structure of this embodiment, the load input to the end member 6 can be smoothly transmitted to the rear step wall 51 of the lower cross member 5. In addition, the rear wall 61 has high rigidity in the vehicle width direction and the vehicle vertical direction, and is also joined to the rear step wall 51, so the rigidity is further improved in the vehicle width direction and the vehicle vertical direction. can be achieved. Moreover, by improving the rigidity of the lower cross member 5, the rigidity of the rear side member 42 can also be further increased.

さらに、本実施形態の車両下部構造において、下側クロスメンバ５は、フロントサイドメンバ４１よりも車両上方に配置されており、下側クロスメンバ５とフロントサイドメンバ４１とが接合されるフロントフロアパネル１（フロアパネル）の境界部分には、フロントサイドメンバ４１から車両内側へ向かって上り傾斜するフロア傾斜面部１２が設けられている。端部材６は、下側クロスメンバ５に向かって延出する延出部６３を有しており、延出部６３は、フロア傾斜面部１２の位置で下側クロスメンバ５と接合している。
したがって、本実施形態の車両下部構造では、延出部６３がフロア傾斜面部１２の範囲内に位置することになるので、下側クロスメンバ５及び端部材６によってフロントサイドメンバ４１を車両下方から支持することが可能となり、フロントサイドメンバ４１の剛性を向上させ、入力荷重の車両前後方向への伝達効果を高めることができる。 Furthermore, in the vehicle lower structure of this embodiment, the lower cross member 5 is arranged above the front side member 41 in the vehicle, and the lower cross member 5 and the front side member 41 are connected to the front floor panel. 1 (floor panel) is provided with a floor inclined surface portion 12 that slopes upward from the front side member 41 toward the inside of the vehicle. The end member 6 has an extending portion 63 extending toward the lower cross member 5 , and the extending portion 63 is joined to the lower cross member 5 at the floor slope portion 12 .
Therefore, in the vehicle lower structure of this embodiment, since the extension portion 63 is located within the range of the floor slope portion 12, the front side member 41 is supported from below the vehicle by the lower cross member 5 and the end member 6. This makes it possible to improve the rigidity of the front side member 41 and enhance the effect of transmitting the input load in the longitudinal direction of the vehicle.

そして、本実施形態の車両下部構造において、フロア傾斜面部１２に位置する延出部６３は、車両外側に向かうほど車両下側に勾配する勾配部分６３ａを有しており、勾配部分６３ａは、フロントサイドメンバ４１（またはリヤサイドメンバ４２）まで連続して形成されている。したがって、本実施形態の車両下部構造によれば、下側クロスメンバ５がフロントサイドメンバ４１（またはリヤサイドメンバ４２）を支持する剛性を車両幅方向のみならず、車両上下方向に対しても向上させることが可能となり、入力荷重の分散効果を更に高めることができる。 In the vehicle lower structure of the present embodiment, the extension portion 63 located on the floor inclined surface portion 12 has a slope portion 63a that slopes toward the bottom of the vehicle as it goes toward the outside of the vehicle. It is formed continuously up to the side member 41 (or rear side member 42). Therefore, according to the vehicle lower structure of this embodiment, the rigidity with which the lower cross member 5 supports the front side member 41 (or rear side member 42) is improved not only in the vehicle width direction but also in the vehicle vertical direction. This makes it possible to further enhance the input load dispersion effect.

また、本実施形態の車両下部構造において、フロントフロアパネル１及びリヤフロアパネル２（フロアパネル）の下方には電源部材１０が設けられており、電源部材１０は、車両側方視でサイドシル３と重なり合うように配置されているとともに、車両幅方向に延びるクロスメンバ８によって支持されている。そして、リヤサイドメンバ４２には、クロスメンバ８を接合するクロスメンバ接合部４２Ａが設けられており、クロスメンバ接合部４２Ａは、車両下方視でサイドシル３の車両前後方向の範囲に配置されている。
したがって、本実施形態の車両下部構造によれば、クロスメンバ８の端部８ａが、クロスメンバ接合部４２Ａを介してリヤサイドメンバ４２に接合されることになるので、リヤサイドメンバ４２の車両幅方向に対する剛性を向上させることができる。また、クロスメンバ接合部４２Ａは、サイドシル３の車両前後方向の範囲に配置され、車両幅方向の両側から剛性部材がリヤサイドメンバ４２に接合されることになるので、リヤサイドメンバ４２の車両前後方向に対する剛性も向上させることができ、リヤサイドメンバ４２に入力された荷重を車両前後方向に効果的に伝達することができる。 Further, in the vehicle lower structure of this embodiment, a power supply member 10 is provided below the front floor panel 1 and the rear floor panel 2 (floor panel), and the power supply member 10 overlaps the side sill 3 when viewed from the side of the vehicle. It is supported by a cross member 8 extending in the vehicle width direction. The rear side member 42 is provided with a cross member joint portion 42A that joins the cross member 8, and the cross member joint portion 42A is disposed within a range of the side sill 3 in the longitudinal direction of the vehicle when viewed from below the vehicle.
Therefore, according to the vehicle lower structure of this embodiment, the end portion 8a of the cross member 8 is joined to the rear side member 42 via the cross member joint portion 42A, so that Rigidity can be improved. Further, the cross member joint portion 42A is disposed within the range of the side sill 3 in the vehicle longitudinal direction, and the rigid member is joined to the rear side member 42 from both sides in the vehicle width direction. Rigidity can also be improved, and the load input to the rear side member 42 can be effectively transmitted in the longitudinal direction of the vehicle.

さらに、本実施形態の車両下部構造において、リヤサイドメンバ４２は、車両下方に位置する下面部４２ｂと、車両幅方向に位置する側面部４２ｃを有している。そして、クロスメンバ接合部４２Ａには、クロスメンバ接合部ブラケット４３が設けられており、クロスメンバ接合部ブラケット４３は、リヤサイドメンバ４２の下面部４２ｂ及び側面部４２ｃ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、クロスメンバ接合部ブラケット４３がリヤサイドメンバ４２の下面部４２ｂに接合されることにより、リヤサイドメンバ４２の車両幅方向及び車両前後方向に対する剛性を向上させ、クロスメンバ接合部ブラケット４３がリヤサイドメンバ４２の側面部４２ｃに接合されることにより、リヤサイドメンバ４２の車両前後方向及び車両上下方向に対する剛性を向上させることが可能となるので、リヤサイドメンバ４２への荷重伝達を促進することができる。 Furthermore, in the vehicle lower structure of this embodiment, the rear side member 42 has a lower surface portion 42b located below the vehicle and a side surface portion 42c located in the vehicle width direction. A cross member joint bracket 43 is provided at the cross member joint portion 42A, and the cross member joint bracket 43 is joined to the lower surface portion 42b and side surface portion 42c of the rear side member 42.
Therefore, in the vehicle lower structure of the present embodiment, the cross member joint bracket 43 is joined to the lower surface portion 42b of the rear side member 42, thereby improving the rigidity of the rear side member 42 in the vehicle width direction and the vehicle longitudinal direction. By joining the member joint bracket 43 to the side surface 42c of the rear side member 42, it is possible to improve the rigidity of the rear side member 42 in the vehicle longitudinal direction and the vehicle vertical direction, so that the load is transmitted to the rear side member 42. can be promoted.

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。
例えば、電源部材１０の大きさ及び形状は、図１に示すものに限られず、クロスメンバ８によって支持することが可能であれば、適用車種などに応じて他の大きさ及び形状の電源部材を搭載することもできる。 Although the embodiments of the present invention have been described above, the present invention is not limited to the embodiments described above, and various modifications and changes can be made based on the technical idea of the present invention.
For example, the size and shape of the power source member 10 are not limited to those shown in FIG. It can also be installed.

１ フロントフロアパネル
２ リヤフロアパネル
３ サイドシル
４ サイドメンバ
５ 下側クロスメンバ
６ 端部材
８ クロスメンバ
８ａ 車両幅方向の端部
１０ 電源部材
１１ フロア側面部
１２ フロア傾斜面部
１３ フロア中央面部
３１ フロントサイドシル
３２ リヤサイドシル
４１ フロントサイドメンバ
４１ａ 後端部
４２ リヤサイドメンバ
４２Ａ クロスメンバ接合部
４２ａ 前端部
４２ｂ 下面部
４２ｃ 側面部
４３ クロスメンバ接合部ブラケット
５１ 後側段差壁
６１ 端部材の後壁
６１ａ 後側接合部
６２ 端部材の前壁
６２ａ 前側接合部
６３ 延出部
６３ａ 勾配部分 1 Front floor panel 2 Rear floor panel 3 Side sill 4 Side member 5 Lower cross member 6 End member 8 Cross member 8a End in vehicle width direction 10 Power supply member 11 Floor side part 12 Floor slope part 13 Floor center part 31 Front side sill 32 Rear Side sill 41 Front side member 41a Rear end 42 Rear side member 42A Cross member joint 42a Front end 42b Lower surface 42c Side surface 43 Cross member joint bracket 51 Rear step wall 61 Rear wall of end member 61a Rear joint 62 End Front wall of member 62a Front joint portion 63 Extension portion 63a Slope portion

Claims (8)

フロアパネル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シルと、
該サイドシルの車両内側に隣接して配置され、車両前後方向に延びる左右一対のサイドメンバと、
前記フロアパネルの下方に設けられ、車両幅方向に延びる下側クロスメンバとを有する車両下部構造において、
前記下側クロスメンバには、該下側クロスメンバの車両幅方向外側の端部に接合される端部材が設けられ、
前記端部材は、前記サイドシルおよび前記サイドメンバに接合されていることを特徴とする車両下部構造。 A pair of left and right side sills provided on the sides of the floor panel in the vehicle width direction and extending in the vehicle longitudinal direction;
a pair of left and right side members arranged adjacent to the inside of the vehicle of the side sill and extending in the longitudinal direction of the vehicle;
A vehicle lower structure including a lower cross member provided below the floor panel and extending in the vehicle width direction,
The lower cross member is provided with an end member that is joined to an outer end in the vehicle width direction of the lower cross member,
A vehicle lower structure, wherein the end member is joined to the side sill and the side member. 前記サイドメンバは、車両前後の位置に設けられるフロントサイドメンバおよびリヤサイドメンバを有し、
前記端部材は、車両前方側が前記フロントサイドメンバに接合され、前記端部材の車両後方側に、前記サイドシルに接合される後壁を有し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。 The side member includes a front side member and a rear side member provided at the front and rear positions of the vehicle,
The vehicle according to claim 1, wherein the end member has a vehicle front side joined to the front side member, and a vehicle rear side of the end member has a rear wall joined to the side sill. Undercarriage. 前記端部材と前記リヤサイドメンバとは、前記後壁と前記リヤサイドメンバとが重なり合った状態で、接合されていることを特徴とする請求項２に記載の車両下部構造。 3. The vehicle lower structure according to claim 2, wherein the end member and the rear side member are joined together with the rear wall and the rear side member overlapping each other. 前記後壁は、前記下側クロスメンバの車両後部側に位置する後側段差壁で接合される後側接合部を有しており、
前記後側段差壁は、前記フロアパネルの車両幅方向内側に位置する平坦なフロア中央面部まで延びていることを特徴とする請求項２または３に記載の車両下部構造。 The rear wall has a rear joint portion joined by a rear step wall located on the rear side of the vehicle of the lower cross member,
4. The vehicle lower structure according to claim 2, wherein the rear stepped wall extends to a flat center surface of the floor located inside the floor panel in the vehicle width direction. 前記下側クロスメンバは、前記フロントサイドメンバよりも車両上方に配置され、
前記下側クロスメンバと前記フロントサイドメンバとが接合される前記フロアパネルの境界部分には、前記フロントサイドメンバから車両内側へ向かって上り傾斜するフロア傾斜面部が設けられ、
前記端部材は、前記下側クロスメンバに向かって延出する延出部を有し、該延出部は、前記フロア傾斜面部の位置で前記下側クロスメンバと接合していることを特徴とする請求項２に記載の車両下部構造。 The lower cross member is located above the front side member of the vehicle,
A floor inclined surface portion that slopes upward from the front side member toward the inside of the vehicle is provided at a boundary portion of the floor panel where the lower cross member and the front side member are joined,
The end member has an extending portion extending toward the lower cross member, and the extending portion is joined to the lower cross member at the floor slope portion. The vehicle lower structure according to claim 2. 前記フロア傾斜面部に位置する前記延出部は、車両外側に向かうほど車両下側に勾配する勾配部分を有し、該勾配部分は、前記フロントサイドメンバまたは前記リヤサイドメンバまで連続して形成されていることを特徴とする請求項５に記載の車両下部構造。 The extension portion located on the floor slope portion has a slope portion that slopes downward toward the vehicle toward the outside of the vehicle, and the slope portion is formed continuously to the front side member or the rear side member. The vehicle undercarriage structure according to claim 5, characterized in that: 前記フロアパネルの下方には電源部材が設けられ、該電源部材は、車両側方視で前記サイドシルと重なり合うように配置されているとともに、車両幅方向に延びるクロスメンバによって支持され、
前記リヤサイドメンバには、前記クロスメンバを接合するクロスメンバ接合部が設けられ、該クロスメンバ接合部は、車両下方視で前記サイドシルの車両前後方向の範囲に配置されていることを特徴とする請求項２から６のいずれか一項に記載の車両下部構造。 A power supply member is provided below the floor panel, and the power supply member is arranged to overlap the side sill when viewed from the side of the vehicle, and is supported by a cross member extending in the vehicle width direction;
The rear side member is provided with a cross member joint portion for joining the cross member, and the cross member joint portion is disposed within a range of the side sill in the longitudinal direction of the vehicle when viewed from below the vehicle. The vehicle lower structure according to any one of Items 2 to 6. 前記リヤサイドメンバは、車両下方に位置する下面部と、車両幅方向に位置する側面部を有し、
前記クロスメンバ接合部には、クロスメンバ接合部ブラケットが設けられ、該クロスメンバ接合部ブラケットは、前記リヤサイドメンバの下面部及び側面部に接合されていることを特徴とする請求項７に記載の車両下部構造。 The rear side member has a lower surface portion located below the vehicle and a side surface portion located in the vehicle width direction,
8. The cross member joint bracket is provided with a cross member joint bracket, and the cross member joint bracket is joined to a lower surface portion and a side surface portion of the rear side member. Vehicle undercarriage structure.
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