JP2021094941A

JP2021094941A - Floor structure

Info

Publication number: JP2021094941A
Application number: JP2019225946A
Authority: JP
Inventors: 耕太藤沢; kota Fujisawa; 後東　光繁; Mitsushige Goto; 光繁後東; 貴志新田; Takashi Nitta; 匠露崎; Takumi Tsuyusaki
Original assignee: Honda Motor Co Ltd
Current assignee: Honda Motor Co Ltd
Priority date: 2019-12-13
Filing date: 2019-12-13
Publication date: 2021-06-24
Also published as: CN112977637B; CN112977637A

Abstract

To provide a floor structure that can promptly transfer a side collision load to a cross member and improve support rigidity.SOLUTION: A floor structure comprises: side sills 2 extending in the vehicle front-rear direction; a floor panel 3 disposed on an inner side in the vehicle width direction of the side sills 2; and a rear cross member 6 extending above the floor panel 3 in the vehicle width direction. The rear cross member 6 includes: a front side surface portion 12 extending downward from a front edge of an upper surface portion 11; a rear side surface portion 13 extending downward from a rear edge; a pair of front side and rear side flange portions 14 and 15 extending from lower ends of the front side surface portion 12 and the rear side surface portion 13, respectively; and an extension portion 20 having a cross-sectional U-shape extending from an outer side in the vehicle width direction of the upper surface portion 11, the front side surface portion 12, and the rear side surface portion 13 toward the side sill 2. An outer side end portion 21 of the extention portion 20 in the vehicle width direction is located further on an outer side in the vehicle width direction than outer side end portion 14a and 15a of the pair of front side and rear side flange portions 14 and 15 and is separated toward an inner side in the vehicle width direction from a side surface portion 2a of the side sill 2.SELECTED DRAWING: Figure 2

Description

本発明は、フロア構造に関する。 The present invention relates to a floor structure.

従来のフロア構造としては、車両前後方向に延設されるサイドシルと、車幅方向に延設されるクロスメンバと、サイドシルおよびクロスメンバ間を結合する結合部材とを備えるフロア構造が知られている（例えば、特許文献１参照）。
結合部材は、クロスメンバよりも強度の低い鋼板を用いて構成されている。結合部材の各接合フランジの形状は、接合されるサイドシルまたはクロスメンバの形状に合わせて曲げ加工されている。
そして、このような結合部材を用いることにより、クロスメンバの端部をサイドシルの内側側面から離間させた状態で接続することができる。
また、クロスメンバの端部にフランジ加工を施して、サイドシルの内側側面に直接、クロスメンバを接合するものが知られている（例えば、特許文献２参照）。 As a conventional floor structure, a floor structure including a side sill extending in the front-rear direction of the vehicle, a cross member extending in the vehicle width direction, and a connecting member for connecting the side sill and the cross member is known. (See, for example, Patent Document 1).
The connecting member is constructed by using a steel plate having a strength lower than that of the cross member. The shape of each joining flange of the joining member is bent according to the shape of the side sill or cross member to be joined.
Then, by using such a connecting member, the end portion of the cross member can be connected in a state of being separated from the inner side surface of the side sill.
Further, it is known that the end portion of the cross member is flanged and the cross member is directly joined to the inner side surface of the side sill (see, for example, Patent Document 2).

特許５３９１７７１号Patent No. 5391771 特許５５９８６３２号Patent No. 5598632

上記従来のフロア構造では、クロスメンバの構成材料として引張強度が３９０Ｍｐａ以上の高張力鋼板（ハイテン材）を用いる場合、接合されるサイドシルの内側側面の形状に合わせて、クロスメンバの端部に接続フランジ等を曲げ加工することは、困難であった。
また、クロスメンバの端部をサイドシルの内側側面から離間させた状態とすると、サイドシルに加わる側面衝突荷重を早期にクロスメンバに伝達できない。このため、十分な支持剛性を発揮させるためには、さらなる改善が求められている。
本発明は、クロスメンバに早期に側面衝突荷重を伝達でき、支持剛性を向上させることができるフロア構造を提供することを目的とする。 In the above-mentioned conventional floor structure, when a high-tensile steel plate (high-tensile steel) having a tensile strength of 390 MPa or more is used as a constituent material of the cross member, it is connected to the end of the cross member according to the shape of the inner side surface of the side sill to be joined. It was difficult to bend the flange and the like.
Further, if the end portion of the cross member is separated from the inner side surface of the side sill, the side collision load applied to the side sill cannot be transmitted to the cross member at an early stage. Therefore, further improvement is required in order to exhibit sufficient support rigidity.
An object of the present invention is to provide a floor structure capable of transmitting a side collision load to a cross member at an early stage and improving support rigidity.

本発明のフロア構造は、車両前後方向に延設されるサイドシルと、サイドシルの車幅方向内側に設けられるフロアパネルと、フロアパネルの上側で車幅方向に延びるクロスメンバと、を備え、クロスメンバは、上面部と、上面部の前縁から立ち下がる前側面部と、上面部の後縁から立ち下がる後側面部と、前側面部及び後側面部の下端からそれぞれ前方及び後方に延びる一対の鍔部と、上面部、前側面部および後側面部の車幅方向外側からサイドシルに向かって延びる断面視コ字状の延長部と、を備え、延長部の車幅方向外側端部は、一対の鍔部の車幅方向外側端部よりも車幅方向外側に位置しつつ、サイドシルに対して車幅方向内側に離間していることを特徴とする。 The floor structure of the present invention includes a side sill extending in the front-rear direction of the vehicle, a floor panel provided inside the side sill in the vehicle width direction, and a cross member extending in the vehicle width direction on the upper side of the floor panel. Is a pair of an upper surface portion, a front side surface portion that rises from the front edge of the upper surface portion, a rear side surface portion that rises from the rear edge of the upper surface portion, and a pair extending forward and rearward from the lower ends of the front side surface portion and the rear side surface portion, respectively. It is provided with a flange portion and a U-shaped extension portion in a cross-sectional view extending from the outside in the vehicle width direction of the upper surface portion, the front side surface portion and the rear side surface portion toward the side sill, and the extension portion has a pair of outer end portions in the vehicle width direction. It is characterized in that it is located on the outer side in the vehicle width direction with respect to the outer end portion in the vehicle width direction of the flange portion, and is separated from the side sill on the inner side in the vehicle width direction.

本発明によれば、クロスメンバに早期に側面衝突荷重を伝達でき、支持剛性を向上させることができるフロア構造が提供される。 According to the present invention, there is provided a floor structure capable of transmitting a side collision load to a cross member at an early stage and improving support rigidity.

本発明の実施形態のフロア構造で、フロアカーペットを外してフロアパネル全体の構成を示す平面図である。It is a top view which shows the structure of the whole floor panel by removing the floor carpet in the floor structure of embodiment of this invention. 実施形態のフロア構造で、図１中ＩＩ−ＩＩ線に沿った位置で部分断面図である。In the floor structure of the embodiment, it is a partial cross-sectional view at a position along the line II-II in FIG. 実施形態のフロア構造で、要部の構成を示す図２中ＩＩＩ−ＩＩＩ線に沿った位置での部分断面図である。It is a partial cross-sectional view at the position along the line III-III in FIG. 2 which shows the structure of the main part in the floor structure of embodiment. 実施形態のフロア構造で、図３中仮想線ＩＶで囲んだ要部を示す要部の構成を示す要部の拡大断面図である。FIG. 5 is an enlarged cross-sectional view of a main part showing the configuration of the main part showing the main part surrounded by the virtual line IV in FIG. 3 in the floor structure of the embodiment. 実施形態のフロア構造で、図２中仮想線Ｖで囲んだ要部を示す拡大断面図である。FIG. 5 is an enlarged cross-sectional view showing a main part surrounded by a virtual line V in FIG. 2 in the floor structure of the embodiment. 実施形態のフロア構造で、図１中ＶＩ−ＶＩ線に沿った位置での部分断面図である。FIG. 5 is a partial cross-sectional view of the floor structure of the embodiment at a position along the VI-VI line in FIG. 実施形態のフロア構造で、図１中ＶＩＩ−ＶＩＩ線に沿った位置での断面図である。FIG. 5 is a cross-sectional view of the floor structure of the embodiment at a position along the line VII-VII in FIG. 実施形態のフロア構造で、要部の構成を図１中矢視ＶＩＩＩ方向から見た平面図である。In the floor structure of the embodiment, the configuration of the main part is a plan view seen from the direction of VIII in the middle of FIG. 実施形態のフロア構造で、図８中ＩＸ−ＩＸ線に沿った位置での端面図である。It is the floor structure of the embodiment, and is the end view at the position along the IX-IX line in FIG. 実施形態のフロア構造で、図８中Ｘ−Ｘ線に沿った位置での端面図である。FIG. 5 is an end view of the floor structure of the embodiment at a position along the line XX in FIG. 実施形態のフロア構造で、図８中ＸＩ−ＸＩ線に沿った位置での端面図である。FIG. 5 is an end view of the floor structure of the embodiment at a position along the XI-XI line in FIG.

以下、本発明の一実施形態について、適宜図面を参照しながら説明する。同一の構成要素には同一の符号を付し、重複する説明を省略する。方向を説明する際には、特に示さない限り、基本的に運転者から見た前後，左右あるいは上下に基づいて説明する。また、「車幅方向」は「左右方向」と同義である。 Hereinafter, an embodiment of the present invention will be described with reference to the drawings as appropriate. The same components are designated by the same reference numerals, and duplicate description will be omitted. When explaining the direction, unless otherwise specified, the explanation is basically based on the front-back, left-right, or up-down as seen from the driver. Further, the "vehicle width direction" is synonymous with the "left-right direction".

図１は、本発明の基本的な実施形態のフロア構造が適用された車両の車体１を示すものである。
本実施形態の車体１は、車両前後方向に延設される左，右一対のサイドシル２，２と、サイドシル２，２の車幅方向内側に設けられて、トンネル部４を有するフロアパネル３とを備えている。
すなわち、フロアパネル３は、車幅方向中間部に車両前後方向に沿ってトンネル部４を設けている。トンネル部４は、車両上方に向けて膨出形成されていて、車幅方向断面形状を略ハット状としている。 FIG. 1 shows a vehicle body 1 to which the floor structure of the basic embodiment of the present invention is applied.
The vehicle body 1 of the present embodiment includes a pair of left and right side sills 2 and 2 extending in the front-rear direction of the vehicle, and a floor panel 3 provided inside the side sills 2 and 2 in the vehicle width direction and having a tunnel portion 4. It has.
That is, the floor panel 3 is provided with a tunnel portion 4 in the middle portion in the vehicle width direction along the vehicle front-rear direction. The tunnel portion 4 is formed to bulge toward the upper side of the vehicle, and has a substantially hat-shaped cross-sectional shape in the vehicle width direction.

また、フロアパネル３は、トンネル部４の両側に左，右一対の平面部３ａ，３ａを有している。平面部３ａは、サイドシル２とトンネル部４との間に全体として平坦となるように延設されている。
そして、フロアパネル３は、平面部３ａから車両上方に向けて突設される複数のパネルビード形状部３ｂを有している。パネルビード形状部３ｂは、長手方向を車両前後方向に沿わせて、車幅方向にそれぞれ所定の間隔を置いて延設されている（図２参照）。 Further, the floor panel 3 has a pair of left and right flat surfaces 3a and 3a on both sides of the tunnel portion 4. The flat surface portion 3a extends between the side sill 2 and the tunnel portion 4 so as to be flat as a whole.
The floor panel 3 has a plurality of panel bead-shaped portions 3b projecting from the flat surface portion 3a toward the upper side of the vehicle. The panel bead shape portions 3b are extended along the vehicle front-rear direction in the longitudinal direction and at predetermined intervals in the vehicle width direction (see FIG. 2).

図２に示すように、フロアパネル３の上側には、車幅方向に延びる前，後側クロスメンバ５，６が備えられている。前，後側クロスメンバ５，６は、長手方向を車幅方向に沿わせて、左，右のサイドシル２，２間に延設されている。また、前，後側クロスメンバ５，６は、それぞれ車両前後方向の断面形状が一部でＭ字状（図７参照）を有し、略ハット形状となるように形成されている。 As shown in FIG. 2, the upper side of the floor panel 3 is provided with front and rear cross members 5 and 6 extending in the vehicle width direction. The front and rear cross members 5 and 6 extend between the left and right side sills 2 and 2 along the vehicle width direction in the longitudinal direction. Further, the front and rear cross members 5 and 6 each have an M-shape (see FIG. 7) in part in the cross-sectional shape in the front-rear direction of the vehicle, and are formed so as to have a substantially hat shape.

本実施形態では、主に後側クロスメンバ６の構成について説明する。なお、前側クロスメンバ５の構成は、後側クロスメンバ６の構成と同一乃至均等であるので、説明を省略する。
後側クロスメンバ６は、上面部１１と、上面部１１の前縁から立ち下がる前側面部１２と、上面部１１の後縁から立ち下がる後側面部１２と、前側面部１２及び後側面部１３の下端からそれぞれ前方及び後方に延びる一対の前，後側鍔部１４，１５とを備えている。 In this embodiment, the configuration of the rear cross member 6 will be mainly described. Since the configuration of the front cross member 5 is the same as or equal to the configuration of the rear cross member 6, the description thereof will be omitted.
The rear cross member 6 includes an upper surface portion 11, a front side surface portion 12 that descends from the front edge of the upper surface portion 11, a rear side surface portion 12 that descends from the rear edge of the upper surface portion 11, and a front side surface portion 12 and a rear side surface portion. It is provided with a pair of front and rear flange portions 14 and 15 extending from the lower end of the 13 to the front and the rear, respectively.

また、図４に示すように、後側クロスメンバ６は、上面部１１、前側面部１２および後側面部１３の車幅方向外側からサイドシル２に向かって延びる断面視コ字状の延長部２０を備えている。
延長部２０の車幅方向外側端部２１は、一対の前，後側鍔部１４，１５の外側端部１４ａ，１５ａよりも車幅方向外側に所定寸法Ｌ１、突設されている。
そして、車幅方向外側端部２１は、サイドシル２の側面部２ａに対して、当接していない状態となるように車幅方向内側に所定寸法Ｌ２の隙間を有して離間されている。 Further, as shown in FIG. 4, the rear cross member 6 is a cross-sectional U-shaped extension portion 20 extending from the outer side of the upper surface portion 11, the front side surface portion 12 and the rear side surface portion 13 in the vehicle width direction toward the side sill 2. It has.
The outer end portion 21 of the extension portion 20 in the vehicle width direction is projected from the outer end portions 14a and 15a of the pair of front and rear side flange portions 14 and 15 by a predetermined dimension L1 on the outer side in the vehicle width direction.
The outer end portion 21 in the vehicle width direction is separated from the side surface portion 2a of the side sill 2 with a gap of a predetermined dimension L2 inside in the vehicle width direction so as not to be in contact with the side surface portion 2a.

さらに、フロアパネル３は、車幅方向外側端部で上向きに湾曲してサイドシル２の側面部２ａに結合される湾曲部２３を有している（図３参照）。
一方、図４に示すように、後側クロスメンバ６は、湾曲部２３に対向する位置で、延長部２０の下方で、車幅方向内側に向けて凹む凹部２５を有している。
本実施形態のフロア構造では、前，後側鍔部１４，１５の外側端部１４ａ，１５ａから前側面部１２及び後側面部１３の上下方向略１/３の位置まで、車幅方向内側に向けて凹状に湾曲するように凹部２５を凹ませている。 Further, the floor panel 3 has a curved portion 23 that is curved upward at the outer end portion in the vehicle width direction and is coupled to the side surface portion 2a of the side sill 2 (see FIG. 3).
On the other hand, as shown in FIG. 4, the rear cross member 6 has a recess 25 that is recessed inward in the vehicle width direction below the extension portion 20 at a position facing the curved portion 23.
In the floor structure of the present embodiment, from the outer end portions 14a and 15a of the front and rear side flange portions 14 and 15 to the positions of the front side surface portion 12 and the rear side surface portion 13 approximately 1/3 in the vertical direction, inward in the vehicle width direction. The recess 25 is recessed so as to be curved in a concave shape.

さらに、本実施形態のフロア構造では、図１に示すように、前，後側クロスメンバ５，６の左，右両端部とサイドシル２，２とを結合する結合部材３０が設けられている。
結合部材３０は、正面視略門型に形成されていて、加工が容易に行えるように、前，後側クロスメンバ５，６（例えば１８００ＭＰａ程度）よりも強度の低い材料（例えば２７０Ｍｐａ級鋼板）を用いて構成されている。 Further, in the floor structure of the present embodiment, as shown in FIG. 1, a connecting member 30 for connecting the left and right ends of the front and rear cross members 5 and 6 and the side sills 2 and 2 is provided.
The connecting member 30 is formed in a substantially gate shape in front view, and is made of a material having lower strength than the front and rear cross members 5 and 6 (for example, about 1800 MPa) (for example, 270 MPa class steel plate) so that processing can be easily performed. Is configured using.

また、図５に示すように、結合部材３０は、上面結合部３１を有している。上面結合部３１は、後側クロスメンバ６のうち、上面部１１の前後方向寸法と略同等の幅を有していている。
そして、上面結合部３１は、後側クロスメンバ６の上面部１１とサイドシル２の上面部２ｂとを結合する。上面結合部３１には、複数の補強ビードが車幅方向に沿って形成されている。補強ビードは、上面部１１および上面部２ｂを跨ぐように形成されている。 Further, as shown in FIG. 5, the coupling member 30 has an upper surface coupling portion 31. The upper surface connecting portion 31 has a width substantially equal to the front-rear dimension of the upper surface portion 11 of the rear cross members 6.
Then, the upper surface connecting portion 31 connects the upper surface portion 11 of the rear cross member 6 and the upper surface portion 2b of the side sill 2. A plurality of reinforcing beads are formed on the upper surface joint portion 31 along the vehicle width direction. The reinforcing bead is formed so as to straddle the upper surface portion 11 and the upper surface portion 2b.

また、結合部材３０は、上面結合部３１と一体に前，後側面結合部３２，３３を有している。前，後側面結合部３２，３３は、上面結合部３１の前，後側縁からそれぞれ下方に延設されている。
そして、前，後側面結合部３２，３３は、水平方向断面形状を略Ｌ字状として、面外方向をそれぞれ直交させている。これにより、各前，後側面結合部３２，３３は、後側クロスメンバ６の前，後側面部１２，１３とサイドシル２の側面部２ａとに対してそれぞれ結合される。 Further, the coupling member 30 has front and rear side surface coupling portions 32 and 33 integrally with the top surface coupling portion 31. The front and rear side joints 32 and 33 extend downward from the front and rear edges of the top joint 31, respectively.
The front and rear side surface joint portions 32 and 33 have a substantially L-shaped cross-sectional shape in the horizontal direction and are orthogonal to each other in the out-of-plane direction. As a result, the front and rear side surface connecting portions 32 and 33 are coupled to the front and rear side surface portions 12 and 13 of the rear cross member 6 and the side surface portions 2a of the side sill 2, respectively.

さらに、結合部材３０は、上面結合部３１と各前，後側面結合部３２，３３とを一体に接続して連続させる前，後連続部３４，３５を有している（図５で示す網掛け部分参照）。
結合部材３０は、後側クロスメンバ６よりも強度の低い材料で構成されている。このため、結合部材３０は、上面結合部３１に対して、屈曲される各前，後側面結合部３２，３３および前，後連続部３４，３５を容易に加工できる。 Further, the coupling member 30 has front and rear continuous portions 34 and 35 in which the upper surface coupling portion 31 and the front and rear side coupling portions 32 and 33 are integrally connected and continuous (the net shown in FIG. 5). See the hanging part).
The connecting member 30 is made of a material having a lower strength than the rear cross member 6. Therefore, the coupling member 30 can easily process the front and rear side coupling portions 32 and 33 and the front and rear continuous portions 34 and 35 that are bent with respect to the upper surface coupling portion 31.

たとえば、結合部材３０の強度が高い場合、加工のために必要とされる切欠状のエスケープ部３６（図５で示す破線部分参照）を設けなければならない。しかしながら、本実施形態のフロア構造では、上面結合部３１と各前，後側面結合部３２，３３との間にエスケープ部３６を最小化もしくは設ける必要がない。
このため、結合部材３０は、上面結合部３１と各前，後側面結合部３２，３３とが連続して一体に接続させるように連続部３５，３５を設けることができる。 For example, when the strength of the connecting member 30 is high, a notch-shaped escape portion 36 (see the broken line portion shown in FIG. 5) required for processing must be provided. However, in the floor structure of the present embodiment, it is not necessary to minimize or provide the escape portion 36 between the upper surface connecting portion 31 and the front and rear side connecting portions 32 and 33, respectively.
Therefore, the connecting member 30 can be provided with continuous portions 35, 35 so that the upper surface coupling portion 31 and the front and rear side surface coupling portions 32, 33 are continuously and integrally connected.

また、図３に示すように、後側クロスメンバ６は、内面に補強部材４０を有している。
本実施形態の補強部材４０は、前，後フランジ部を後側クロスメンバ６の前，後鍔１４，１５とともにフロアパネル３の平面部３ａに接合している。
そして、補強部材４０は、後側クロスメンバ６とともに、車幅方向に沿うように延設されている。補強部材４０の長手方向の一端部である外側縁４１は、サイドシル２の側面部２ａに対向する位置まで延設されている。
また、補強部材４０の外側縁４１とは、反対側の他端部である内側縁４２は、トンネル部４の手前で側面４ｃに対向する位置まで延設されている（図６参照）。 Further, as shown in FIG. 3, the rear cross member 6 has a reinforcing member 40 on the inner surface.
In the reinforcing member 40 of the present embodiment, the front and rear flange portions are joined to the flat surface portion 3a of the floor panel 3 together with the front and rear flanges 14 and 15 of the rear cross member 6.
The reinforcing member 40 is extended along with the rear cross member 6 along the vehicle width direction. The outer edge 41, which is one end in the longitudinal direction of the reinforcing member 40, extends to a position facing the side surface portion 2a of the side sill 2.
Further, the inner edge 42, which is the other end on the opposite side of the outer edge 41 of the reinforcing member 40, extends to a position facing the side surface 4c in front of the tunnel portion 4 (see FIG. 6).

図３に示すように、補強部材４０は、後側クロスメンバ６の裏面側方向に向けて複数の固定部４３が膨出形成されている。そして、これらの固定部４３を後側クロスメンバ６の内側面６ｃに接合させる。これにより、補強部材４０は、後側クロスメンバ６の内側に固定される。 As shown in FIG. 3, the reinforcing member 40 is formed with a plurality of fixing portions 43 bulging toward the back surface side of the rear cross member 6. Then, these fixing portions 43 are joined to the inner side surface 6c of the rear cross member 6. As a result, the reinforcing member 40 is fixed to the inside of the rear cross member 6.

そして、本実施形態のフロア構造では、後側クロスメンバ６の内面に補強部材４０が配置された状態で、上面部１１側および補強部材４０を結合する溶接打点６０（図８中に示す×印参照）が上面視千鳥状に配置される。 Then, in the floor structure of the present embodiment, the welding spot 60 connecting the upper surface portion 11 side and the reinforcing member 40 with the reinforcing member 40 arranged on the inner surface of the rear cross member 6 (x mark shown in FIG. 8). See) are arranged in a staggered pattern on the top view.

本実施形態のフロア構造では、複数の溶接打点６０を車幅方向三列で、かつ上面視千鳥状に配置して、後側クロスメンバ６の上面部１１側および補強部材４０を結合している。
すなわち、図７に示すように、後側クロスメンバ６の上面部１１には、車幅方向に延設される前後一対の凸部１１ｂ，１１ｂが形成されている。凸部１１ｂ，１１ｂ間には、凹部１１ａが形成されている。凹部１１ａは、凸部１１ｂとともに車両前後方向で凹凸状となるように、凸部１１ｂよりも車両上下方向で低い位置に設けられている。
また、後側クロスメンバ６の内側に設けられた補強部材４０は、後側クロスメンバ６の凹凸形状に沿うように形成されている。
そして、後側クロスメンバ６および補強部材４０の車両前後方向の断面形状は、車両前後方向中央が凹む、略Ｍ字状に形成されている。 In the floor structure of the present embodiment, a plurality of welding spots 60 are arranged in three rows in the vehicle width direction and in a staggered pattern when viewed from above, and the upper surface portion 11 side of the rear cross member 6 and the reinforcing member 40 are connected. ..
That is, as shown in FIG. 7, a pair of front and rear convex portions 11b and 11b extending in the vehicle width direction are formed on the upper surface portion 11 of the rear cross member 6. A concave portion 11a is formed between the convex portions 11b and 11b. The concave portion 11a is provided at a position lower than the convex portion 11b in the vertical direction of the vehicle so as to be uneven in the front-rear direction of the vehicle together with the convex portion 11b.
Further, the reinforcing member 40 provided inside the rear cross member 6 is formed so as to follow the uneven shape of the rear cross member 6.
The cross-sectional shape of the rear cross member 6 and the reinforcing member 40 in the vehicle front-rear direction is formed in a substantially M shape in which the center in the vehicle front-rear direction is recessed.

後側クロスメンバ６の水平部６ｂでは、凸部１１ｂ，１１ｂおよび凹部１１ａに対して、図８に示す千鳥状に配置される各溶接打点６０にて、補強部材４０が後側クロスメンバ６に接合される。
図９に示すように、凸部１１ｂ，１１ｂの溶接打点６０の上下方向位置は、凹部１１ａの溶接打点６０の上下方向位置（図１０参照）よりも高くなるように設定されている。 In the horizontal portion 6b of the rear cross member 6, the reinforcing member 40 is attached to the rear cross member 6 at each welding spot 60 arranged in a staggered pattern with respect to the convex portions 11b, 11b and the concave portion 11a. Be joined.
As shown in FIG. 9, the vertical position of the welding spot 60 of the convex portions 11b and 11b is set to be higher than the vertical position of the welding spot 60 of the concave portion 11a (see FIG. 10).

また、補強部材４０は、水平部６ｂに設けられる各溶接打点６０の上下方向位置に合わせて、交互に上下する凹凸形状に形成されている。
そして、これらの溶接打点６０により、上下方向で上面部１１側と補強部材４０との間は、強固に結合される。
また、後側クロスメンバ６と補強部材４０との接合により、後側クロスメンバ６の内面と補強部材４０の上面との間には、閉空間部が形成される。このため、後側クロスメンバ６は、補強部材４０を接合させることによって、曲げ方向および圧壊方向の剛性を効率的に向上させることができる。 Further, the reinforcing member 40 is formed in a concave-convex shape that alternately moves up and down according to the vertical position of each welding spot 60 provided on the horizontal portion 6b.
Then, these welding spots 60 firmly bond the upper surface portion 11 side and the reinforcing member 40 in the vertical direction.
Further, by joining the rear cross member 6 and the reinforcing member 40, a closed space portion is formed between the inner surface of the rear cross member 6 and the upper surface of the reinforcing member 40. Therefore, the rear cross member 6 can efficiently improve the rigidity in the bending direction and the crushing direction by joining the reinforcing member 40.

本実施形態の後側クロスメンバ６は、図１に示すように、車幅方向左，右一対の水平部６ｂ，６ｂの間に、トンネルクロス部６ａが形成されている。トンネルクロス部６ａは、水平部６ｂ，６ｂよりも上方に隆起している。これにより、トンネルクロス部６ａは、トンネル部４を跨いで直交するように形成されている。 In the rear cross member 6 of the present embodiment, as shown in FIG. 1, a tunnel cross portion 6a is formed between a pair of horizontal portions 6b and 6b on the left and right in the vehicle width direction. The tunnel cross portion 6a is raised above the horizontal portions 6b and 6b. As a result, the tunnel cross portion 6a is formed so as to be orthogonal to each other across the tunnel portion 4.

本実施形態の後側クロスメンバ６のうち、左右の水平部６ｂ，６ｂは、図７に示すように車両前後方向にてＭ字状の断面形状を有している。また、トンネルクロス部６ａは、図１１に示すように車両前後方向にてハット状の断面形状を有する。トンネル部４の上方に位置するトンネルクロス部６ａ内には、補強部材４０が設けられていない。このため、補強部材４０，４０は、トンネル部４の位置で左，右に分割されて、別部材として構成されている。 Of the rear cross members 6 of the present embodiment, the left and right horizontal portions 6b and 6b have an M-shaped cross-sectional shape in the front-rear direction of the vehicle as shown in FIG. Further, the tunnel cross portion 6a has a hat-shaped cross-sectional shape in the front-rear direction of the vehicle as shown in FIG. The reinforcing member 40 is not provided in the tunnel cross portion 6a located above the tunnel portion 4. Therefore, the reinforcing members 40 and 40 are divided into left and right at the position of the tunnel portion 4, and are configured as separate members.

また、図２に示すように、フロアパネル３の上面部に配設された後側クロスメンバ６に対して、フロアパネル３を挟んで上下反対の下側には、車幅方向に沿ってバッテリパック１００が配置されている。
本実施形態のバッテリパック１００は、所定の上下方向寸法を有する略直方体形状を呈する複数のバッテリセル１１５と、バッテリセル１１５，１１５間に車幅方向に沿って延設される下面側クロスメンバ１１０とを有し、周囲が保護用のバッテリパックカバー１１２で覆われている。 Further, as shown in FIG. 2, with respect to the rear cross member 6 arranged on the upper surface of the floor panel 3, a battery is placed on the lower side opposite to the upper and lower sides of the floor panel 3 along the vehicle width direction. Pack 100 is arranged.
The battery pack 100 of the present embodiment has a plurality of battery cells 115 having a substantially rectangular parallelepiped shape having predetermined vertical dimensions, and a lower surface side cross member 110 extending along the vehicle width direction between the battery cells 115 and 115. And the periphery is covered with a protective battery pack cover 112.

本実施形態の後側クロスメンバ６に設けられた左，右の水平部６ｂ，６ｂは、連結部材１２０を介して、これらのバッテリパック１００に設けられた下面側クロスメンバ１１０に連結されている。
下面側クロスメンバ１１０は、車幅方向に長手方向を沿わせた長尺形状となるように形成されている。そして、車両前後方向に複数、並べられたそれぞれのバッテリパック１００，１００の間に、各下面側クロスメンバ１１０が延在されて一体となるように固定されている。 The left and right horizontal portions 6b and 6b provided on the rear cross member 6 of the present embodiment are connected to the lower surface cross member 110 provided on the battery pack 100 via the connecting member 120. ..
The lower surface side cross member 110 is formed so as to have a long shape along the longitudinal direction in the vehicle width direction. Then, each of the lower surface side cross members 110 is extended and fixed so as to be integrated between the plurality of battery packs 100 and 100 arranged in the front-rear direction of the vehicle.

また、下面側クロスメンバ１１０には、車幅方向に所定の間隔を置いて連結部材１２０，１２０が設けられている。連結部材１２０は、軸方向を上下方向に沿わせたカラー部材１２１が設けられている。そして、連結部材１２０の上端部中央には、雌ネジ部が形成されたボルト孔５１，５２が上下方向に軸方向を沿わせて開口形成されている。雌ネジ部は、バッテリパック１００の固定に用いる締結ボルト５０を螺合するように構成されている。 Further, the lower surface side cross member 110 is provided with connecting members 120 and 120 at predetermined intervals in the vehicle width direction. The connecting member 120 is provided with a collar member 121 whose axial direction is along the vertical direction. At the center of the upper end portion of the connecting member 120, bolt holes 51 and 52 having female screw portions formed are formed in the vertical direction along the axial direction. The female screw portion is configured to screw the fastening bolt 50 used for fixing the battery pack 100.

さらに、後側鍔部１５には、重ねられたフロアパネル３，補強部材４０および後側クロスメンバ６の水平部６ｂを貫通する挿通開口３ｄ，３ｅ…が形成されている。
そして、各挿通開口３ｄ，３ｅは、ボルト孔５１，５２に合せられた状態で、これらの挿通開口３ｄ，３ｅに挿通された締結ボルト５０を、ボルト孔５１の雌ネジ部に螺合する。これにより、連結部材１２０を介して、バッテリパック１００が車体１のフロアパネル３の下面側に固定される。また、連結部材１２０を締結する際、挿通開口３ｄの周縁では、補強部材４０および後側鍔部１５がフロアパネル３の水平部６ｂおよびトンネル部４の外側縁４ａとともに共締めされる。 Further, the rear flange portion 15 is formed with insertion openings 3d, 3e ... That penetrate the stacked floor panel 3, the reinforcing member 40, and the horizontal portion 6b of the rear cross member 6.
Then, the fastening bolts 50 inserted through the insertion openings 3d and 3e are screwed into the female screw portions of the bolt holes 51 in a state where the insertion openings 3d and 3e are aligned with the bolt holes 51 and 52. As a result, the battery pack 100 is fixed to the lower surface side of the floor panel 3 of the vehicle body 1 via the connecting member 120. Further, when fastening the connecting member 120, the reinforcing member 40 and the rear flange portion 15 are fastened together with the horizontal portion 6b of the floor panel 3 and the outer edge 4a of the tunnel portion 4 at the peripheral edge of the insertion opening 3d.

さらに、サイドシル２の下方からは、車幅方向中央に向けて鍔状のバッテリ支持部材１１１が延設されている。そして、バッテリ支持部材１１１は、バッテリパック１００の左，右外側縁部を下方から支持して、バッテリパック１００を車幅方向に沿わせてフロアパネル３の下側に平行に配置する。 Further, from below the side sill 2, a collar-shaped battery support member 111 extends toward the center in the vehicle width direction. Then, the battery support member 111 supports the left and right outer edges of the battery pack 100 from below, and arranges the battery pack 100 parallel to the lower side of the floor panel 3 along the vehicle width direction.

また、下面側クロスメンバ１１０の両端部は、サイドシル２，２に設けられたバッテリ支持部材１１１によって下方から支持されている。
下面側クロスメンバ１１０は、長手方向を車幅方向に沿わせて、サイドシル２，２間に延設されている。
このため、フロアパネル３の下側に配置位置された下面側クロスメンバ１１０は、フロアパネル３の車幅方向中間部に上方に向けて突設されたトンネル部４と、後側クロスメンバ６のトンネルクロス部６ａとを跨いで、車幅方向に延設される。 Further, both ends of the lower surface side cross member 110 are supported from below by the battery support members 111 provided on the side sills 2 and 2.
The lower surface side cross member 110 extends between the side sills 2 and 2 along the longitudinal direction along the vehicle width direction.
Therefore, the lower surface side cross member 110 arranged on the lower side of the floor panel 3 is a tunnel portion 4 projecting upward in the middle portion in the vehicle width direction of the floor panel 3 and the rear side cross member 6. It is extended in the vehicle width direction so as to straddle the tunnel cross portion 6a.

そして、図２に示すように、サイドシル２の内部には、バルクヘッド２００が配置されている。本実施形態のバルクヘッド２００は、下部２０２から上部２０１に向けて車両内側に傾斜する車外側辺を有して側面視略台形形状に形成されている。
図２に示すように、バルクヘッド２００の上部２０１は、後側クロスメンバ６に結合されている。また、バルクヘッド２００の下部２０２は、結合部材２０３を介してバッテリ支持部材１１１と結合されている。
さらに、本実施形態のバルクヘッド２００は、サイドシル２の延設方向に沿って、所定の間隔を置いて複数設けられている（図１参照）。 Then, as shown in FIG. 2, a bulkhead 200 is arranged inside the side sill 2. The bulkhead 200 of the present embodiment has a vehicle outer side inclined inward from the lower portion 202 toward the upper portion 201, and is formed in a substantially trapezium-shaped side view.
As shown in FIG. 2, the upper portion 201 of the bulkhead 200 is coupled to the rear cross member 6. Further, the lower portion 202 of the bulkhead 200 is coupled to the battery support member 111 via the coupling member 203.
Further, a plurality of bulkheads 200 of the present embodiment are provided at predetermined intervals along the extending direction of the side sill 2 (see FIG. 1).

また、図１に示すように、本実施形態の前，後側クロスメンバ５，６は、車両前後方向に所定の間隔を置いて一対配置されている。各前，後側クロスメンバ５，６には、複数のシートマウントブラケット３００，３１０が配置されている。
これらのシートマウントブラケット３００，３１０には、乗員が着座する図示しない前，後側シートが装着される。
そして、前側クロスメンバ５側は、後側クロスメンバ６側より強度が低くなるように設定されている。 Further, as shown in FIG. 1, the front and rear cross members 5 and 6 of the present embodiment are arranged in pairs at predetermined intervals in the front-rear direction of the vehicle. A plurality of seat mount brackets 300 and 310 are arranged on the front and rear cross members 5 and 6.
The front and rear seats (not shown) on which the occupant sits are mounted on the seat mount brackets 300 and 310.
The strength of the front cross member 5 side is set to be lower than that of the rear cross member 6 side.

さらに、図１に示すように、フロアパネル３は、平面部３ａとトンネル部４とに分割されている。そして、平面部３ａとトンネル部４とは、前，後側クロスメンバ５，６および下面側クロスメンバ１１０により車両上下方向から挟持された状態で、締結ボルト５０により締結されて固定されている。 Further, as shown in FIG. 1, the floor panel 3 is divided into a flat surface portion 3a and a tunnel portion 4. The flat surface portion 3a and the tunnel portion 4 are fastened and fixed by the fastening bolt 50 in a state of being sandwiched by the front and rear side cross members 5 and 6 and the lower surface side cross member 110 from the vertical direction of the vehicle.

次に、本実施形態のフロア構造の作用効果について説明する。
本実施形態のフロア構造によれば、クロスメンバに早期に側面衝突荷重を伝達でき、支持剛性を向上させることができるフロア構造が提供される。
すなわち、図４に示すように、後側クロスメンバ６の延長部２０の車幅方向外側端部２１は、前，後側鍔部１４，１５の外側端部１４ａ，１５ａよりも車幅方向外側に所定寸法Ｌ１、突設されている。 Next, the action and effect of the floor structure of the present embodiment will be described.
According to the floor structure of the present embodiment, a floor structure capable of transmitting a side collision load to the cross member at an early stage and improving the support rigidity is provided.
That is, as shown in FIG. 4, the outer end portion 21 of the extension portion 20 of the rear cross member 6 in the vehicle width direction is outside the outer ends 14a and 15a of the front and rear side flange portions 14 and 15 in the vehicle width direction. The predetermined dimension L1 is projected.

また、車幅方向では、後側クロスメンバ６の延長部２０のうち、車幅方向外側端部２１は、サイドシル２の側面部２ａに対して所定寸法Ｌ２を有して近接して配置されている。
本実施形態の所定寸法Ｌ２は、車幅方向外側端部２１が断面視コ字状の延長部２０を有している寸法分、従来と比較して小さく設定可能である。
このため、サイドシル２は、側面部２ａから車幅方向外側端部２１を介して、後側クロスメンバ６に早期に側面衝突荷重を伝達させて、支持剛性を向上させることができる。 Further, in the vehicle width direction, of the extension portions 20 of the rear cross member 6, the vehicle width direction outer end portion 21 is arranged close to the side surface portion 2a of the side sill 2 with a predetermined dimension L2. There is.
The predetermined dimension L2 of the present embodiment can be set smaller than the conventional dimension by the dimension in which the outer end portion 21 in the vehicle width direction has the extension portion 20 having a U-shaped cross section.
Therefore, the side sill 2 can improve the support rigidity by transmitting the side collision load from the side surface portion 2a to the rear side cross member 6 via the outer end portion 21 in the vehicle width direction at an early stage.

詳しくは、後側クロスメンバ６の端部の延長部２０は、上面部１１、前側面部１２および後側面部１３の車幅方向外側からサイドシルに向かって延びる断面視コ字状に形成されている。
この形状では、後側クロスメンバ６を構成する材料として引張強度が１８００ＭＰａ程度まで高めた高張力鋼板を用いても、延長部２０をサイドシル２に可及的直近まで接近させるように加工できる。
このため、前側クロスメンバ５及び前側クロスメンバ５と同様に形成される後側クロスメンバ６によって、早期にサイドシル２に加わる側面衝突荷重を支持させることができる。 Specifically, the extension portion 20 of the end portion of the rear cross member 6 is formed in a cross-sectional view U shape extending from the outer side of the upper surface portion 11, the front side surface portion 12 and the rear side surface portion 13 in the vehicle width direction toward the side sill. There is.
In this shape, even if a high-strength steel plate having a tensile strength increased to about 1800 MPa is used as the material constituting the rear cross member 6, the extension portion 20 can be processed so as to be as close as possible to the side sill 2.
Therefore, the front cross member 5 and the rear cross member 6 formed in the same manner as the front cross member 5 can support the side collision load applied to the side sill 2 at an early stage.

また、図４に示すように、フロアパネル３を側面部２ａに接合させる湾曲部２３は、フロアパネル３の水平部分から上向きに湾曲している。
本実施形態の湾曲部２３は、後側クロスメンバ６と側面部２ａとの間に介在している。特に湾曲部２３の入隅部分は、延長部２０の車幅方向外側端部２１に近接する方向に膨出している。
このような場合でも、後側クロスメンバ６は、車幅方向の外側端部に凹部２５を有している。凹部２５は、湾曲部２３に対向する位置に凹状に形成されている。 Further, as shown in FIG. 4, the curved portion 23 for joining the floor panel 3 to the side surface portion 2a is curved upward from the horizontal portion of the floor panel 3.
The curved portion 23 of the present embodiment is interposed between the rear cross member 6 and the side surface portion 2a. In particular, the inside corner portion of the curved portion 23 bulges in the direction close to the outer end portion 21 of the extension portion 20 in the vehicle width direction.
Even in such a case, the rear cross member 6 has a recess 25 at the outer end portion in the vehicle width direction. The recess 25 is formed in a concave shape at a position facing the curved portion 23.

さらに、本実施形態の凹部２５は、前側面部１２及び後側面部１３の一部および前，後側鍔部１４，１５の外側端部１４ａ，１５ａを車幅方向内側に向けて凹状に後退させている。
このため、後側クロスメンバ６の端部の延長部２０を、サイドシル２の側面部２ａに車幅方向外側端部２１が近接するように配置した場合であっても、凹部２５によって、湾曲部２３の膨出部分を回避して、後側クロスメンバ６は、干渉しない。
このため、後側クロスメンバ６の端部の延長部２０をサイドシル２の側面部２ａに可及的直近まで接近（所定寸法Ｌ２）させることができる。 Further, the recess 25 of the present embodiment retracts a part of the front side surface portion 12 and the rear side surface portion 13 and the outer end portions 14a and 15a of the front and rear side flange portions 14 and 15 in a concave shape toward the inside in the vehicle width direction. I'm letting you.
Therefore, even when the extension portion 20 of the end portion of the rear cross member 6 is arranged so that the outer end portion 21 in the vehicle width direction is close to the side surface portion 2a of the side sill 2, the curved portion is formed by the recess 25. The rear cross member 6 does not interfere with each other, avoiding the bulging portion of 23.
Therefore, the extension portion 20 of the end portion of the rear cross member 6 can be brought as close as possible to the side surface portion 2a of the side sill 2 (predetermined dimension L2).

さらに、結合部材３０よりも強度の高い、例えば高張力鋼板製の前，後側クロスメンバ５，６をサイドシル２と結合させることができる。このため、左，右のサイドシル２，２は、前，後側クロスメンバ５，６によって、井桁状に接合されてフロア剛性を向上させることができる。
また、結合部材３０は、前，後側クロスメンバ５，６よりも強度を低く設定できる。例えば、結合部材３０は、後側クロスメンバ６とは、別体で構成される。このため、結合部材３０は、２７０Ｍｐａ級の鋼板を使用できる。このため、延性を高めてプレス成形のためのエスケープ部３６の形状を最小化できる。
しかも、連続部３５が上面結合部３１と各前，後側面結合部３２，３３とを連続させて、結合効率を上昇させることができる。したがって、フロア強度、剛性のタフネスを向上させることができる。 Further, front and rear cross members 5 and 6, which are stronger than the coupling member 30, for example, made of high-strength steel plate, can be bonded to the side sill 2. Therefore, the left and right side sills 2 and 2 can be joined in a grid shape by the front and rear cross members 5 and 6 to improve the floor rigidity.
Further, the strength of the connecting member 30 can be set lower than that of the front and rear cross members 5 and 6. For example, the connecting member 30 is formed separately from the rear cross member 6. Therefore, as the coupling member 30, a 270 Mpa class steel plate can be used. Therefore, the ductility can be improved and the shape of the escape portion 36 for press molding can be minimized.
Moreover, the continuous portion 35 can make the upper surface coupling portion 31 and the front and rear side surface coupling portions 32 and 33 continuous to increase the coupling efficiency. Therefore, the floor strength and the toughness of the rigidity can be improved.

また、図８に示すように、後側クロスメンバ６と、内側に位置する補強部材４０（図示せず）とを接合する溶接打点の配置は、上面視千鳥状となるように構成されている。
このため、後側クロスメンバ６と補強部材４０とは、上下に偏りなく接合される。したがって、後側クロスメンバ６の延設方向の各部位における断面強度を均質化させながら補強できる。
このように本実施形態のフロア構造では、後側クロスメンバ６の断面強度の強弱を減少させることができる。したがって、応力が集中して曲げ起点となるような弱点部位をなくすことができる。
そして、および凹部１１ａの各打点を千鳥状に配置することにより、側面衝突荷重が入力しても支持できる。 Further, as shown in FIG. 8, the arrangement of welding spots for joining the rear cross member 6 and the reinforcing member 40 (not shown) located inside is configured to be staggered in a top view. ..
Therefore, the rear cross member 6 and the reinforcing member 40 are joined without any bias in the vertical direction. Therefore, it is possible to reinforce the rear cross member 6 while homogenizing the cross-sectional strength at each portion in the extending direction.
As described above, in the floor structure of the present embodiment, the strength of the cross-sectional strength of the rear cross member 6 can be reduced. Therefore, it is possible to eliminate a weak point portion where stress is concentrated and becomes a bending starting point.
Then, by arranging the hitting points of the recess 11a in a staggered manner, it can be supported even if a side collision load is input.

車両前後方向の断面形状をＭ字状とした上面部１１側および補強部材４０を千鳥状の溶接打点６０にて結合している。このため、後側クロスメンバ６の上下高さを低く設定しても、Ｍ字状の断面を有する後側クロスメンバ６および補強部材４０は、所望の曲げ剛性を有する。
さらに、車両前後方向の断面形状をＭ字状としたことに加え、凸部１１ｂおよび凹部１１ａの各打点が千鳥状に配置される。このため、サイドシル２から後側クロスメンバ６に大きな側面衝突荷重が入力しても所望の支持剛性を得られる。 The upper surface portion 11 side having an M-shaped cross-sectional shape in the front-rear direction of the vehicle and the reinforcing member 40 are connected at staggered welding spots 60. Therefore, even if the vertical height of the rear cross member 6 is set low, the rear cross member 6 and the reinforcing member 40 having an M-shaped cross section have desired bending rigidity.
Further, in addition to making the cross-sectional shape in the front-rear direction of the vehicle M-shaped, the hitting points of the convex portion 11b and the concave portion 11a are arranged in a staggered manner. Therefore, even if a large side collision load is input from the side sill 2 to the rear cross member 6, the desired support rigidity can be obtained.

また、後側クロスメンバ６の左，右の水平部６ｂ，６ｂ間をトンネルクロス部６ａで連結することにより、後側クロスメンバ６は、左，右一本化される。このため、部品点数を減少させて製造コストを削減できる。 Further, by connecting the left and right horizontal portions 6b and 6b of the rear cross member 6 with the tunnel cross portion 6a, the rear cross member 6 is unified into one left and right. Therefore, the number of parts can be reduced and the manufacturing cost can be reduced.

そして、図１に示すように、引張強度が１８００ＭＰａ程度まで高めた高張力鋼板等を用いて、１本の長い後側クロスメンバ６または前側クロスメンバ５を製造できる。このため、さらに製造コストを抑制することができる。
また、図９，図１０に示すように、水平部６ｂ，６ｂは、極力低く設定することにより乗員の足置き場を提供できる。
さらに、図１１に示すトンネルクロス部６ａは、フロアパネル３のトンネル部４と強固に結合されている。このため、車幅方向でトンネルクロス部６ａの位置では、補強部材４０を省略できる。よって、トンネルクロス部６ａの上方向への突出寸法を抑制することができる。また、トンネルクロス部６ａで補強部材４０を省略する分、部品点数を減少させて軽量化を図ることができる。 Then, as shown in FIG. 1, one long rear cross member 6 or front cross member 5 can be manufactured by using a high-strength steel plate or the like having a tensile strength increased to about 1800 MPa. Therefore, the manufacturing cost can be further suppressed.
Further, as shown in FIGS. 9 and 10, the horizontal portions 6b and 6b can be set as low as possible to provide a foothold for the occupant.
Further, the tunnel cross portion 6a shown in FIG. 11 is firmly coupled to the tunnel portion 4 of the floor panel 3. Therefore, the reinforcing member 40 can be omitted at the position of the tunnel cross portion 6a in the vehicle width direction. Therefore, the upward protrusion dimension of the tunnel cross portion 6a can be suppressed. Further, since the reinforcing member 40 is omitted in the tunnel cross portion 6a, the number of parts can be reduced and the weight can be reduced.

さらに、フロアパネル３よりも下側に設けられたバッテリパック１００には、下面側クロスメンバ１１０が設けられている。下面側クロスメンバ１１０は、連結部材１２０，１２０を介して後側クロスメンバ６の後側鍔部１５に連結されている（図２参照）。
このため、フロアパネル３よりも下側に設けられたバッテリパック１００の下面側クロスメンバ１１０によって、フロアパネル３のトンネル部４が補強される。
したがって、トンネル部４に左，右の後側クロスメンバ６の補強部材４０がなくても、応力が集中しやすいトンネルクロス部６ａに所望の剛性を与えることができる。 Further, the battery pack 100 provided below the floor panel 3 is provided with a lower surface side cross member 110. The lower surface side cross member 110 is connected to the rear side flange portion 15 of the rear side cross member 6 via the connecting members 120 and 120 (see FIG. 2).
Therefore, the tunnel portion 4 of the floor panel 3 is reinforced by the cross member 110 on the lower surface side of the battery pack 100 provided below the floor panel 3.
Therefore, even if the tunnel portion 4 does not have the reinforcing members 40 of the left and right rear cross members 6, the desired rigidity can be given to the tunnel cross portion 6a where stress is likely to be concentrated.

また、連結部材１２０が締結されると、挿通開口３ｄの周縁では、補強部材４０および後側鍔部１５がフロアパネル３の水平部６ｂおよびトンネル部４の外側縁４ａとともに共締めされる。
このため、バッテリパック１００の固定と、補強部材４０、後側クロスメンバ６、水平部６ｂおよび外側縁４ａ間の接続とが少ない締結ボルト５０によって同時に行える。したがって、部材効率が良好である。 When the connecting member 120 is fastened, the reinforcing member 40 and the rear flange portion 15 are fastened together with the horizontal portion 6b of the floor panel 3 and the outer edge 4a of the tunnel portion 4 at the peripheral edge of the insertion opening 3d.
Therefore, the fixing of the battery pack 100 can be performed at the same time by the fastening bolt 50 which has less connection between the reinforcing member 40, the rear cross member 6, the horizontal portion 6b and the outer edge 4a. Therefore, the member efficiency is good.

さらに、下面側クロスメンバ１１０は、車幅方向で、トンネル部４およびトンネルクロス部６ａを跨ぐように車幅方向に延設されて接続している。トンネルクロス部６ａは湾曲形状を呈するため、側面衝突荷重に弱いことが知られている。しかしながら、フロアパネル３の下側で、バッテリパック１００の下面側クロスメンバ１１０が上面側の後側クロスメンバ６に対して、上下方向に離間した位置で、かつ平行に配置される。
これにより、所望の強度をフロアパネル３に持たせることができる。 Further, the lower surface side cross member 110 is extended and connected in the vehicle width direction so as to straddle the tunnel portion 4 and the tunnel cross portion 6a in the vehicle width direction. Since the tunnel cross portion 6a has a curved shape, it is known to be vulnerable to a side collision load. However, on the lower side of the floor panel 3, the lower surface side cross member 110 of the battery pack 100 is arranged at a position separated in the vertical direction and parallel to the upper surface side rear cross member 6.
As a result, the floor panel 3 can have a desired strength.

本実施形態の車体のフロア構造では、図１に示すように、サイドシル２の外側に所定の間隔を置いて設けられたバルクヘッド２００によって、側面衝突荷重は、後側クロスメンバ６と下方のバッテリパック１００の下面側クロスメンバ１１０に分散される。
また、バルクヘッド２００は、圧壊して衝撃エネルギを吸収する。このため、衝撃エネルギの吸収特性が良好である。 In the floor structure of the vehicle body of the present embodiment, as shown in FIG. 1, the bulkhead 200 provided on the outside of the side sill 2 at a predetermined interval allows the side collision load to be applied to the rear cross member 6 and the lower battery. It is dispersed in the cross member 110 on the lower surface side of the pack 100.
Further, the bulkhead 200 is crushed to absorb impact energy. Therefore, the impact energy absorption characteristics are good.

そして、本実施形態のフロア構造では、前側クロスメンバ５の強度が後側クロスメンバ６の強度と比較して低くなるように設定されている。このため、前突時の乗員に加わる衝撃を前側クロスメンバ５が潰れて緩和できる。
また、後側クロスメンバ６は、前側クロスメンバ５と比較して強度が高い。このため、車体１のフロア構造の剛性を向上させることができる。 Then, in the floor structure of the present embodiment, the strength of the front cross member 5 is set to be lower than the strength of the rear cross member 6. Therefore, the impact applied to the occupant at the time of a front collision can be mitigated by crushing the front cross member 5.
Further, the rear cross member 6 has higher strength than the front cross member 5. Therefore, the rigidity of the floor structure of the vehicle body 1 can be improved.

さらに、本実施形態のフロアパネル３は、図１に示すように、平面部３ａとトンネル部４とに分割されている。そして、平面部３ａとトンネル部４とは、締結ボルト５０によって締結されている。
この際、図２に示すように、水平部６ｂとトンネルクロス部６ａとは、後側クロスメンバ６および下面側クロスメンバ１１０の連結部材１２０により挟込まれて固定されている。
このため、水平部６ｂとトンネルクロス部６ａとが強固に結合される。したがって、車体１のフロア構造の強度を、車両前方および車両側方からの衝撃吸収に対して向上させることができる。
また、バッテリパック１００を固定する締結ボルト５０を用いて、水平部６ｂとトンネルクロス部６ａとを接続して固定できる。このため、別部材を用意する必要がなく、部品点数の増大が抑制されて製造コストを削減できる。 Further, as shown in FIG. 1, the floor panel 3 of the present embodiment is divided into a flat surface portion 3a and a tunnel portion 4. The flat surface portion 3a and the tunnel portion 4 are fastened by a fastening bolt 50.
At this time, as shown in FIG. 2, the horizontal portion 6b and the tunnel cross portion 6a are sandwiched and fixed by the connecting member 120 of the rear side cross member 6 and the lower surface side cross member 110.
Therefore, the horizontal portion 6b and the tunnel cross portion 6a are firmly connected. Therefore, the strength of the floor structure of the vehicle body 1 can be improved against shock absorption from the front of the vehicle and the side of the vehicle.
Further, the horizontal portion 6b and the tunnel cross portion 6a can be connected and fixed by using the fastening bolt 50 for fixing the battery pack 100. Therefore, it is not necessary to prepare a separate member, an increase in the number of parts can be suppressed, and the manufacturing cost can be reduced.

上述してきたように、本実施形態のフロア構造では、後側クロスメンバ６の延長部２０によって、早期に後側クロスメンバ６に側面衝突荷重を伝達させることができる。
このため、サイドシル２に加わる側面衝突荷重を受ける支持剛性を向上させたフロア構造が提供される、といった実用上有益な作用効果を発揮する。 As described above, in the floor structure of the present embodiment, the lateral collision load can be transmitted to the rear cross member 6 at an early stage by the extension portion 20 of the rear cross member 6.
Therefore, a practically beneficial effect such as providing a floor structure having improved support rigidity for receiving a side collision load applied to the side sill 2 is exhibited.

本発明は上述した実施形態に限定されるものではなく、種々の変形が可能である。上述した実施形態は本発明を理解しやすく説明するために例示したものであり、必ずしも説明した全ての構成を備えるものに限定されるものではない。また、ある実施形態の構成の一部を他の実施形態の構成に置き換えることが可能であり、また、ある実施形態の構成に他の実施形態の構成を加えることも可能である。また、各実施形態の構成の一部について削除し、若しくは他の構成の追加・置換をすることが可能である。上記実施形態に対して可能な変形は、たとえば、以下のようなものである。 The present invention is not limited to the above-described embodiment, and various modifications are possible. The above-described embodiments are exemplified for the purpose of explaining the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the configurations described. Further, it is possible to replace a part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment. Further, it is possible to delete a part of the configuration of each embodiment, or add / replace another configuration. Possible modifications to the above embodiment are, for example, as follows.

本実施形態のフロア構造では、図２に示す後側クロスメンバ６が上面部１１、前側面部１２および後側面部１３の車幅方向外側からサイドシル２に向かって延びる断面視コ字状の延長部２０を備えている（図４参照）。
そして、延長部２０の下方には、車幅方向内側に凹む凹部２５が設けられている。しかしながら、凹部２５の形状が特にこれに限定されるものではない。たとえば、湾曲部２３の上端まで逃げることができるように、前，後側鍔部１４，１５の外側端部１４ａ，１５ａから前側面部１２及び後側面部１３の上下方向略１/１０〜３/５程度まで、車幅方向内側に向けて凹状としてもよく、凹部２５を他の形状としても湾曲部２３と干渉しにくい形状であればどのような形状であってもよい。 In the floor structure of the present embodiment, the rear cross member 6 shown in FIG. 2 is a U-shaped extension in a cross-sectional view extending from the outer side of the upper surface portion 11, the front side surface portion 12 and the rear side surface portion 13 in the vehicle width direction toward the side sill 2. A unit 20 is provided (see FIG. 4).
A recess 25 recessed inward in the vehicle width direction is provided below the extension portion 20. However, the shape of the recess 25 is not particularly limited to this. For example, the front side surface portion 12 and the rear side surface portion 13 are approximately 1 / 10-3 in the vertical direction from the outer end portions 14a, 15a of the front and rear side flange portions 14, 15 so that the curved portion 23 can escape to the upper end. Up to about / 5, it may be concave toward the inside in the vehicle width direction, and the concave portion 25 may have any other shape as long as it does not easily interfere with the curved portion 23.

また、本実施形態では、結合部材３０によって、前，後側クロスメンバ５，６の左，右両端部とサイドシル２，２とを結合するように構成されているが、特にこれに限らない。例えば、結合部材３０の形状が他の形状であってもよく、結合部材３０の形状、数量および材質が特に限定されるものではない。 Further, in the present embodiment, the connecting member 30 is configured to connect the left and right ends of the front and rear cross members 5 and 6 to the side sills 2 and 2, but the present invention is not particularly limited to this. For example, the shape of the connecting member 30 may be another shape, and the shape, quantity, and material of the connecting member 30 are not particularly limited.

さらに、本実施形態では、後側クロスメンバ６の内面に沿って補強部材４０が設けられている。しかしながら、特にこれに限らない。例えば補強部材４０の形状が他の形状であってもよく、補強部材４０の形状、数量および材質が特に限定されるものではない。 Further, in the present embodiment, the reinforcing member 40 is provided along the inner surface of the rear cross member 6. However, it is not particularly limited to this. For example, the shape of the reinforcing member 40 may be another shape, and the shape, quantity, and material of the reinforcing member 40 are not particularly limited.

１車体
２サイドシル
３フロアパネル
６後側クロスメンバ（クロスメンバの一つ）
１２，１３前，後側面部
１４，１５前，後側鍔部
１４ａ，１５ａ外側端部
２０延長部
２１車幅方向外側端部 1 Body 2 Side sill 3 Floor panel 6 Rear cross member (one of the cross members)
12, 13 Front, rear side surface 14, 15 Front, rear collar 14a, 15a Outer end 20 Extension 21 Outer end in vehicle width direction

Claims

Side sill extending in the front-rear direction of the vehicle and
The floor panel provided inside the side sill in the vehicle width direction and
A cross member extending in the vehicle width direction on the upper side of the floor panel is provided.
The cross member is formed from an upper surface portion, a front side surface portion that rises from the front edge of the upper surface portion, a rear side surface portion that rises from the rear edge of the upper surface portion, and the lower ends of the front side surface portion and the rear side surface portion, respectively. It is provided with a pair of flange portions extending forward and rearward, and a U-shaped extension portion having a cross-sectional view extending from the outer surface portion, the front side surface portion, and the rear side surface portion in the vehicle width direction toward the side sill.
The outer end portion of the extension portion in the vehicle width direction is located on the outer side in the vehicle width direction of the pair of collar portions on the outer side in the vehicle width direction, and is separated from the side sill on the inner side in the vehicle width direction. The floor structure is characterized by.

The floor panel has a curved portion that is curved upward at the outer end portion in the vehicle width direction and is coupled to the side sill.
The floor structure according to claim 1, wherein the cross member has a recess recessed inward in the vehicle width direction below the extension portion.

It is made of a material having a lower strength than the cross member, and further includes a connecting member for connecting the side sill and the cross member.
The coupling member includes an upper surface coupling portion that connects the upper surface portion of the cross member and the upper surface portion of the side sill, a side coupling portion that connects the side surface portion of the cross member and the side surface portion of the side sill, and the upper surface coupling portion. The floor structure according to claim 1 or 2, further comprising a continuous portion that connects the portion and the side joint portion.

One of claims 1 to 3, wherein the cross member has a reinforcing member on the inner surface, and welding spots for connecting the upper surface portion side and the reinforcing member are arranged in a staggered manner in a top view. Floor structure described in.

The cross member and the reinforcing member have an M-shape having a concave portion between a pair of front and rear convex portions in the front-rear direction of the vehicle, and the hit points of the convex portion and the concave portion are arranged in a staggered manner in the vertical direction. The floor structure according to claim 4, wherein the floor structure is joined by.

The floor structure according to any one of claims 1 to 5, wherein the cross member is composed of a left and right horizontal portion and a tunnel cross portion that rises above the horizontal portion. ..

The sixth aspect of claim 6, wherein the left and right horizontal portions have an M-shaped cross-sectional shape in the vehicle front-rear direction, and the tunnel cross portion has a hat-shaped cross-sectional shape in the vehicle front-rear direction. Floor structure.

A floor panel in which the cross member is arranged on the upper surface, and
A battery pack arranged along the vehicle width direction is provided below the floor panel.
The floor structure according to claim 7, wherein the horizontal portion of the cross member is connected to the lower surface side cross member provided in the battery pack.

The floor panel has a tunnel portion that protrudes upward in the middle portion in the vehicle width direction.
A tunnel cross portion arranged along the tunnel portion is formed on the cross member.
The floor structure according to claim 8, wherein the lower surface side cross member is connected so as to straddle the tunnel portion and the tunnel cross portion in the vehicle width direction.

8. A bulkhead is arranged inside the side sill, the upper portion of the bulkhead is coupled to the cross member, and the lower portion of the bulkhead is coupled to the battery pack. Or the floor structure according to 9.

A pair of the cross members are arranged in the front-rear direction of the vehicle, seat mount brackets are arranged on each of the cross members, and the strength of the front cross member side is set lower than that of the rear cross member side. Item 1. The floor structure according to item 1.

The floor structure according to claim 8, wherein the floor panel is divided into a horizontal portion and a tunnel portion, and the horizontal portion and the tunnel portion are fixed by the cross member and the lower surface side cross member.