JP7276012B2 - Underbody structure - Google Patents

Underbody structure Download PDF

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Publication number
JP7276012B2
JP7276012B2 JP2019158545A JP2019158545A JP7276012B2 JP 7276012 B2 JP7276012 B2 JP 7276012B2 JP 2019158545 A JP2019158545 A JP 2019158545A JP 2019158545 A JP2019158545 A JP 2019158545A JP 7276012 B2 JP7276012 B2 JP 7276012B2
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cross member
floor
width direction
vehicle width
vehicle
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JP2021037785A (en
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勇大 峰島
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Suzuki Motor Corp
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Suzuki Motor Corp
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Priority to JP2019158545A priority Critical patent/JP7276012B2/en
Priority to DE102020117057.2A priority patent/DE102020117057B4/en
Priority to CN202010788814.1A priority patent/CN112441138B/en
Priority to FR2008700A priority patent/FR3100216A1/en
Publication of JP2021037785A publication Critical patent/JP2021037785A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D25/00—Superstructure or monocoque structure sub-units; Parts or details thereof not otherwise provided for
    • B62D25/20—Floors or bottom sub-units
    • B62D25/2009—Floors or bottom sub-units in connection with other superstructure subunits
    • B62D25/2036—Floors or bottom sub-units in connection with other superstructure subunits the subunits being side panels, sills or pillars
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D21/00—Understructures, i.e. chassis frame on which a vehicle body may be mounted
    • B62D21/15—Understructures, i.e. chassis frame on which a vehicle body may be mounted having impact absorbing means, e.g. a frame designed to permanently or temporarily change shape or dimension upon impact with another body
    • B62D21/157—Understructures, i.e. chassis frame on which a vehicle body may be mounted having impact absorbing means, e.g. a frame designed to permanently or temporarily change shape or dimension upon impact with another body for side impacts
    • 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
    • B62D25/02—Side panels
    • B62D25/025—Side sills thereof
    • 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

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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)

Description

本発明は、車体下部構造に関する。 The present invention relates to a vehicle body lower structure.

車両室内のフロア部を構成するフロアパネルの下方側には、プロペラシャフト等の機構部材や、複数の重畳の装置が配置されている。例えば、このような機構部材や装置等を配置するために、フロアパネルの車幅方向中間部を上方に突出させることにより、フロア部の下方側の空間をより広くした構造の車両がある。 Mechanism members such as a propeller shaft and a plurality of overlapping devices are arranged on the lower side of the floor panel that constitutes the floor portion of the vehicle interior. For example, in order to dispose such mechanical members and devices, there is a vehicle with a structure in which the space on the lower side of the floor portion is made wider by projecting upward the middle portion of the floor panel in the vehicle width direction.

フロアパネルは、車幅方向両側のサイドメンバの間に配置されている。また、両側のサイドメンバに架け渡されるクロスメンバによって、フロアパネルは補強されている。当該クロスメンバは、特許文献１に開示されているように、フロアパネルの上面及び下面のそれぞれに接合されているものが知られている。 The floor panel is arranged between the side members on both sides in the vehicle width direction. In addition, the floor panel is reinforced by cross members spanning the side members on both sides. As disclosed in Patent Document 1, the cross member is known to be joined to the upper and lower surfaces of the floor panel.

特開２０１０－２０８３９５号公報JP 2010-208395 A

フロアパネルの車幅方向の中間部をかさ上げしたような構造に対して、上記例のようなクロスメンバを設けることによって、フロアパネルを補強する場合、一定の補強効果を得ることはできる。しかし、フロアパネルの側部が上方に傾斜している部分に対して、側突等を受ける場合、クロスメンバの車幅方向側部が上方に変形する。 When reinforcing the floor panel by providing a cross member as in the above example for a structure in which the intermediate portion of the floor panel in the vehicle width direction is raised, a certain reinforcing effect can be obtained. However, when the side portion of the floor panel slopes upward, the side portion of the cross member in the vehicle width direction is deformed upward if the vehicle receives a side impact or the like.

このとき、変形の度合いによっては、フロア部が車両室内側に大きく突出するように変形する可能性がある。そのため、上記例のような構造には、フロア部の車両室内側に突出するような変形を抑制し、乗員の安全性を向上させる上で、改善の余地があった。 At this time, depending on the degree of deformation, there is a possibility that the floor portion will be deformed so as to protrude greatly into the interior of the vehicle. Therefore, the structure of the above example has room for improvement in terms of suppressing the deformation of the floor portion so as to protrude into the interior of the vehicle and improving the safety of the occupants.

本発明は上記課題を解決するためになされたものであって、その目的は、フロア部が車両室内側に突出する変形を抑制することを可能とする車体下部構造を提供することである。 SUMMARY OF THE INVENTION An object of the present invention is to provide a vehicle body lower part structure capable of suppressing deformation in which the floor portion protrudes into the interior of the vehicle.

上記目的を達成するための本発明に係る車体下部構造は、フロアパネルの下面側の車幅方向両側部に配置され、車両前後方向に延びるフロアサイドメンバと、前記各フロアサイドメンバの車幅方向外側に配置され、車両前後方向に延びるサイドシルと、前記フロアパネルの上面に配置され、両側の前記サイドシルを連結するように車幅方向に延びるフロア上クロスメンバと、を有し、前記フロアパネルは、車幅方向中間部に位置するパネル平面部が車幅方向両側部に対して車両上方に位置し、車両前方視で凸形状となっている。当該車体下部構造において、前記フロアパネルの下面には、平面視で前記フロア上クロスメンバに重なる位置で、車幅方向に延びるフロア下クロスメンバが設けられており、前記フロア上クロスメンバの上部は、車幅方向中間部に位置する上クロスメンバ上面部と、該上クロスメンバ上面部の車幅方向外側端から外側に向かうに従い下方側に傾斜する上クロスメンバ上側傾斜部とを有し、該上クロスメンバ上側傾斜部と前記上クロスメンバ上面部とにより上クロスメンバ上側角部が形成され、前記フロア上クロスメンバの下部は、前記パネル平面部に接合される上クロスメンバ下面部と、該上クロスメンバ下面部の車幅方向外側端から外側に向かうに従い下方側に傾斜し、前記パネル平面部の車幅方向外側に位置する上クロスメンバ下側傾斜部とを有し、該上クロスメンバ下側傾斜部と前記上クロスメンバ下面部とにより上クロスメンバ下側角部が形成され、前記フロア下クロスメンバの下部は、車幅方向中間部に位置する下クロスメンバ下面部と、該下クロスメンバ下面部の車幅方向外側端から外側に向かうに従い下方側に傾斜する下クロスメンバ下側傾斜部とを有し、該下クロスメンバ下側傾斜部の傾斜角は、前記上クロスメンバ下側傾斜部の傾斜角よりも小さく設定され、前記上クロスメンバ上側角部と前記上クロスメンバ下側角部とを結ぶ基準線が前記下クロスメンバ下側傾斜部の下面に交差する位置は、前記下クロスメンバ下面部と前記下クロスメンバ下側傾斜部との接続部よりも車幅方向外側に配置されている。 A vehicle body lower structure according to the present invention for achieving the above object includes: floor side members arranged on both sides in the vehicle width direction on the lower surface side of a floor panel and extending in the vehicle front-rear direction; and each of the floor side members in the vehicle width direction. A side sill is arranged outside and extends in the longitudinal direction of the vehicle, and an upper floor cross member is arranged on the upper surface of the floor panel and extends in the vehicle width direction so as to connect the side sills on both sides. , the panel plane portion located in the middle portion in the vehicle width direction is located above the vehicle with respect to both side portions in the vehicle width direction, and has a convex shape when viewed from the front of the vehicle. In the vehicle body lower structure, an under-floor cross member extending in the vehicle width direction is provided on the lower surface of the floor panel at a position overlapping the above-floor cross-member in plan view, and the upper part of the above-floor cross-member is an upper cross member upper surface portion positioned at a vehicle width direction intermediate portion; and an upper cross member upper inclined portion inclined downward toward the outside from the vehicle width direction outer end of the upper cross member upper surface portion; An upper cross member upper corner portion is formed by the upper cross member upper inclined portion and the upper cross member upper surface portion, and the lower portion of the floor upper cross member includes an upper cross member lower surface portion joined to the panel plane portion, and the upper cross member lower surface portion. an upper cross member lower inclined portion inclined downward toward the outside from the vehicle width direction outside end of the upper cross member lower surface portion and positioned outside the vehicle width direction outside of the panel flat portion; A lower corner portion of the upper cross member is formed by the lower inclined portion and the lower surface portion of the upper cross member. a lower cross member lower inclined portion inclined downward toward the outside from the vehicle width direction outer end of the cross member lower surface portion, and the inclination angle of the lower cross member lower inclined portion is equal to that of the upper cross member lower side; The position at which the reference line, which is set to be smaller than the inclination angle of the side inclined portion and which connects the upper cross member upper corner portion and the upper cross member lower corner portion, intersects the lower surface of the lower cross member lower inclined portion is It is arranged outside in the vehicle width direction of the joint between the lower surface of the lower cross member and the lower inclined portion of the lower cross member.

本発明によれば、フロア部が車両室内側に突出する変形を抑制することができる。 According to the present invention, it is possible to suppress deformation in which the floor portion protrudes toward the interior of the vehicle.

本発明に係る車体下部構造を車両下方から見た斜視図である。1 is a perspective view of a vehicle body lower structure according to the present invention, viewed from below the vehicle; FIG. 図１のＡ－Ａ矢視の断面斜視図である。FIG. 2 is a cross-sectional perspective view taken along line AA of FIG. 1; 図１のフロア下クロスメンバの左外側部材等を車両後方から見た後面図である。FIG. 2 is a rear view of the left outer member and the like of the under-floor cross member of FIG. 1 as seen from the rear of the vehicle;

以下、本発明に係る車体下部構造の一実施形態について、図面（図１～図３）を参照しながら説明する。 An embodiment of a vehicle body lower portion structure according to the present invention will be described below with reference to the drawings (FIGS. 1 to 3).

なお、図において、矢印Ｆｒ方向は車両前後方向における前方を示す。実施形態の説明における「前部（前端）及び後部（後端）」は、車両前後方向における前部及び後部に対応する。また、矢印Ｒ，Ｌは、それぞれ車幅方向の右側、左側を示しており、本実施形態における「左右」は、乗員が車両前方を向いたときの「左側」及び「右側」に対応している。 In the drawings, the direction of arrow Fr indicates the front in the longitudinal direction of the vehicle. "Front part (front end) and rear part (rear end)" in the description of the embodiment correspond to the front part and the rear part in the longitudinal direction of the vehicle. Arrows R and L indicate the right side and the left side in the width direction of the vehicle, respectively. there is

本実施形態の車体下部構造は、側突等の、フロアパネル１０の車幅方向側部に作用する荷重を効率的に受けることにより、車体のフロア部の車両室内側への変形を抑制するための構造である。当該車体下部構造は、フロアパネル１０と、フロアサイドメンバ２，３と、サイドシル６，７と、フロア上クロスメンバ２５と、フロア下クロスメンバ２０と、を有している。本実施形態では、フロア上クロスメンバ２５及びフロア下クロスメンバ２０は、フロアパネル１０を間に挟んで車両上下方向に重なって配置されている。 The vehicle body lower structure of the present embodiment is designed to efficiently receive a load, such as a side impact, acting on the vehicle width direction side portion of the floor panel 10, thereby suppressing deformation of the vehicle body floor portion toward the vehicle interior side. is the structure of The vehicle body lower structure includes a floor panel 10 , floor side members 2 and 3 , side sills 6 and 7 , an upper floor cross member 25 and a lower floor cross member 20 . In this embodiment, the floor upper cross member 25 and the floor lower cross member 20 are arranged to overlap each other in the vertical direction of the vehicle with the floor panel 10 interposed therebetween.

フロアパネル１０、フロア上クロスメンバ２５及びフロア下クロスメンバ２０は、車幅方向中心を通る車両前後方向線に対して、ほぼ左右対称に構成されている。そのため、本実施形態の説明では、主に左側の部分について説明し、右側の部分についての詳細な説明は省いている。 The floor panel 10, the upper floor cross member 25, and the lower floor cross member 20 are configured substantially symmetrical with respect to a vehicle front-rear direction line passing through the center in the vehicle width direction. Therefore, in the description of the present embodiment, the left side portion is mainly described, and detailed description of the right side portion is omitted.

フロアパネル１０は、車体下部に配置され、車両室のフロア部を構成するパネル部材で、図１に示すように、図示しない左右の前輪の後部付近から車両後方に延びている板状の部材である。フロアパネル１０の車幅方向寸法は、車体の車幅方向の寸法にほぼ対応している。 The floor panel 10 is a panel member that is arranged in the lower portion of the vehicle body and constitutes the floor portion of the vehicle compartment, and as shown in FIG. be. The dimension of the floor panel 10 in the vehicle width direction substantially corresponds to the dimension of the vehicle body in the vehicle width direction.

本実施形態のフロアパネル１０は、車幅方向中間部に位置するパネル平面部が車幅方向両側部に対して車両上方に位置し、車両前方視で凸形状となっている。当該フロアパネル１０は、パネル平面部を構成する左側パネル１２及び右側パネル１３を有している。左側パネル１２と右側パネル１３は、車幅方向に互いに間隔を空けて配置されている。すなわち、フロアパネル１０の車幅方向中央部には、車両前後方向に延びる開口（図示せず）が形成される。 The floor panel 10 of the present embodiment has a flat panel portion located in the vehicle width direction middle portion located above the vehicle width direction side portions, and has a convex shape when viewed from the front of the vehicle. The floor panel 10 has a left panel 12 and a right panel 13 that form a panel plane. The left panel 12 and the right panel 13 are spaced apart from each other in the vehicle width direction. That is, an opening (not shown) extending in the vehicle front-rear direction is formed in the center portion of the floor panel 10 in the vehicle width direction.

上記開口には、フロアトンネル１５が設けられている。フロアトンネル１５は、当該開口を塞ぐように、車両前後方向に延びている。すなわち、本実施形態では、フロアトンネル１５は、フロアパネル１０とは別の部材によって構成されている。 A floor tunnel 15 is provided in the opening. The floor tunnel 15 extends in the longitudinal direction of the vehicle so as to block the opening. That is, in the present embodiment, the floor tunnel 15 is made up of a member different from the floor panel 10 .

当該フロアトンネル１５は、図２に示すように、天面部１５ａと、左壁部１５ｂと、右壁部１５ｃと、左側下面部１５ｄと、右側下面部１５ｅとを有している。天面部１５ａは、左右のパネル１２，１３よりも車両上方側に配置され、車両上方を臨む天面を有し、車両前後方向に延びている。 As shown in FIG. 2, the floor tunnel 15 has a top surface portion 15a, a left wall portion 15b, a right wall portion 15c, a left lower surface portion 15d, and a right lower surface portion 15e. The top surface portion 15a is arranged on the vehicle upper side relative to the left and right panels 12 and 13, has a top surface facing the vehicle upper side, and extends in the vehicle front-rear direction.

左壁部１５ｂは、天面部１５ａの車幅方向左側部から車両下方に突出し、車両前後方向に延びている。右壁部１５ｃは、天面部１５ａの車幅方向右側部から車両下方に突出し、車両前後方向に延びている。左側下面部１５ｄは、左壁部１５ｂの下端から車幅方向の左側に突出し、車両前後方向に延びている。右側下面部１５ｅは、右壁部１５ｃの下端から車幅方向の右側に突出し、車両前後方向に延びている。 The left wall portion 15b protrudes downward from the vehicle width direction left portion of the top surface portion 15a and extends in the vehicle front-rear direction. The right wall portion 15c protrudes downward in the vehicle from the vehicle width direction right side portion of the top surface portion 15a and extends in the vehicle front-rear direction. The left lower surface portion 15d protrudes leftward in the vehicle width direction from the lower end of the left wall portion 15b and extends in the vehicle front-rear direction. The right lower surface portion 15e protrudes rightward in the vehicle width direction from the lower end of the right wall portion 15c and extends in the vehicle front-rear direction.

フロアトンネル１５は、天面部１５ａ、左壁部１５ｂ、右壁部１５ｃ、左側下面部１５ｄ及び右側下面部１５ｅによって、車両前後方向視で、車両下方に開くハット型の断面形状を形成している。 The floor tunnel 15 forms a hat-shaped cross-sectional shape that opens downward when viewed in the vehicle front-rear direction by the top surface portion 15a, the left wall portion 15b, the right wall portion 15c, the left lower surface portion 15d, and the right lower surface portion 15e. .

続いて、フロアパネル１０の左側パネル１２について説明する。左側パネル１２は、図２に示すように、左側上面部１２ａと、フロア傾斜部１２ｂと、外側平面部１２ｃと、外側フランジ部１２ｄと、内側フランジ部１２ｅと、を有している。左側上面部１２ａは、フロアトンネル１５の車幅方向左側に配置されるパネル平面部であり、フロアパネル１０の左側の主部となる部分である。左側上面部１２ａは、車両前後方向に延び、且つ、フロアトンネル１５から車幅方向外側に向かって延びている。フロア傾斜部１２ｂは、左側上面部１２ａの車幅方向外側端から、車幅方向外側に向かうに従い車両下方側に向かって傾斜して延びており、且つ車両前後方向に延びている。本実施形態では、フロア傾斜部１２ｂは、外側平面部１２ｃから車幅方向内側に延びる水平線に対して、略４５°の角度で傾斜している（図３）。 Next, the left panel 12 of the floor panel 10 will be explained. The left panel 12, as shown in FIG. 2, has a left upper surface portion 12a, a floor inclined portion 12b, an outer flat portion 12c, an outer flange portion 12d, and an inner flange portion 12e. The left upper surface portion 12a is a flat panel portion disposed on the left side of the floor tunnel 15 in the vehicle width direction, and is a portion that forms the main portion of the left side of the floor panel 10. As shown in FIG. The left upper surface portion 12a extends in the vehicle front-rear direction and also extends outward from the floor tunnel 15 in the vehicle width direction. The inclined floor portion 12b extends from the outer end of the left upper surface portion 12a in the vehicle width direction while being inclined toward the lower side of the vehicle toward the outer side in the vehicle width direction, and also extends in the vehicle front-rear direction. In this embodiment, the inclined floor portion 12b is inclined at an angle of approximately 45° with respect to a horizontal line extending inward in the vehicle width direction from the outer flat portion 12c (Fig. 3).

外側平面部１２ｃは、フロア傾斜部１２ｂの車幅方向外側端から車幅方向外側に延び、且つ車両前後方向に延びている。外側平面部１２ｃの下側面は、左側のフロアサイドメンバ２の上部に接合されている。外側フランジ部１２ｄは、外側平面部１２ｃの車幅方向外側端から車両上方に突出し、車両前後方向に延びている。外側フランジ部１２ｄは、サイドシル６の車幅方向内側面に接合されている。内側フランジ部１２ｅは、左側上面部１２ａの車幅方向内側端から、車幅方向内側に向かうに従い車両上方側に向かって傾斜して延びており、且つ車両前後方向に延びている。 The outer flat portion 12c extends outward in the vehicle width direction from the vehicle width direction outer end of the floor inclined portion 12b and extends in the vehicle front-rear direction. The lower surface of the outer flat portion 12c is joined to the upper portion of the left floor side member 2. As shown in FIG. The outer flange portion 12d protrudes upward from the vehicle width direction outer end of the outer flat portion 12c and extends in the vehicle front-rear direction. The outer flange portion 12d is joined to the inner surface of the side sill 6 in the vehicle width direction. The inner flange portion 12e extends from the vehicle width direction inner end of the left upper surface portion 12a toward the vehicle width direction inner side while being inclined toward the vehicle upper side, and also extends in the vehicle front-rear direction.

右側パネル１３は、上記したように、左側パネル１２と左右対称に構成され、パネル平面部である右側上面部１３ａと、フロア傾斜部（図示せず）と、外側平面部（図示せず）と、外側フランジ部（図示せず）と、内側フランジ部１３ｅと、を有している。フロア傾斜部は、右側上面部１３ａの車幅方向右側端から、車幅方向右側に向かうに従い車両下方側に向かって略４５°の角度で傾斜して延びており、且つ車両前後方向に延びている。また、フロアトンネル１５の車幅方向中央に位置する天面部１５ａは、内側フランジ部１２ｅ，１３ｅの上端よりも上方に位置している。 As described above, the right panel 13 is bilaterally symmetrical to the left panel 12, and includes a right upper surface portion 13a which is a flat panel portion, a floor inclined portion (not shown), and an outer flat portion (not shown). , an outer flange portion (not shown) and an inner flange portion 13e. The floor inclined portion extends from the vehicle width direction right end of the right upper surface portion 13a toward the vehicle width direction right side while being inclined at an angle of approximately 45° toward the vehicle lower side, and also extends in the vehicle front-rear direction. there is Further, the top surface portion 15a located at the center of the floor tunnel 15 in the vehicle width direction is located above the upper ends of the inner flange portions 12e and 13e.

次に、フロアサイドメンバ２，３及びサイドシル６，７について説明する。フロアサイドメンバ２，３は、図１及び図２に示すように、左側のフロアサイドメンバ２と、右側のフロアサイドメンバ３とを有している。左右のフロアサイドメンバ２，３は、車体骨格を構成する高剛性の部材で、左右一対となるように車幅方向に互いに間隔を空けて配置され、車両前後方向に延びている。フロアサイドメンバ２，３は、車両前後方向視で、略四角形状の閉断面を有している。例えば、左側のフロアサイドメンバ２は、左側パネル１２の外側平面部１２ｃの下面にスポット溶接等により接合されている。右側のフロアサイドメンバ３も同様に右側パネル１３に接合されている。 Next, the floor side members 2, 3 and the side sills 6, 7 will be explained. The floor side members 2 and 3 have a left floor side member 2 and a right floor side member 3, as shown in FIGS. The left and right floor side members 2 and 3 are high-rigidity members forming a vehicle body frame, are arranged in a left-right pair with a gap in the vehicle width direction, and extend in the vehicle front-rear direction. The floor side members 2 and 3 have a substantially rectangular closed cross section when viewed in the vehicle front-rear direction. For example, the left floor side member 2 is joined to the lower surface of the outer flat portion 12c of the left panel 12 by spot welding or the like. The right floor side member 3 is similarly joined to the right panel 13 .

サイドシル６，７は、図１～図３に示すように、車両前後方向に延びる部材で、左右のフロアサイドメンバ２，３のそれぞれに対して車幅方向外側に設け、車両前後方向に延びている。例えば、左側のサイドシル６は、左側のフロアサイドメンバ２の車幅方向左外側に配置され、車両前後方向に延びている。左側のサイドシル６は、車両前後方向視で、車幅方向内側に凸のハット型断面形状を有し、左側のサイドシル６の車幅方向内側面は、左側のフロアサイドメンバ２の左側面に接合されている。右側のサイドシル７は、左側のサイドシル６と同様に構成され、右側のフロアサイドメンバ３に接合されている。 As shown in FIGS. 1 to 3, the side sills 6 and 7 are members that extend in the vehicle front-rear direction, are provided outside the left and right floor side members 2 and 3 in the vehicle width direction, and extend in the vehicle front-rear direction. there is For example, the left side sill 6 is arranged on the left outer side in the vehicle width direction of the left floor side member 2 and extends in the vehicle front-rear direction. The left side sill 6 has a hat-shaped cross-sectional shape that is convex inward in the vehicle width direction when viewed in the vehicle front-rear direction. It is The right side sill 7 is configured similarly to the left side sill 6 and is joined to the right floor side member 3 .

続いて、フロア上クロスメンバ２５について説明する。フロア上クロスメンバ２５は、図２及び図３に示すように、車幅方向に延びる部材で、フロアパネル１０の上面に接合されており、フロア下クロスメンバ２０に対応する位置に配置されている。上記したように、フロアパネル１０は、フロア下クロスメンバ２０とフロア上クロスメンバ２５とによって挟持されている。これにより、フロアパネル１０の剛性が確保されている。また、フロア上クロスメンバ２５の車幅方向外側部は、フロアサイドメンバ２，３に対応する位置に設けられている。 Next, the floor cross member 25 will be described. As shown in FIGS. 2 and 3, the upper floor cross member 25 is a member that extends in the vehicle width direction, is joined to the upper surface of the floor panel 10, and is arranged at a position corresponding to the lower floor cross member 20. . As described above, the floor panel 10 is sandwiched between the lower floor cross member 20 and the upper floor cross member 25 . Thereby, the rigidity of the floor panel 10 is ensured. Further, the vehicle width direction outside portion of the floor upper cross member 25 is provided at a position corresponding to the floor side members 2 and 3 .

フロア上クロスメンバ２５の上部は、上クロスメンバ上面部２５ａと、上クロスメンバ上側傾斜部２５ｂと、を有している。上クロスメンバ上面部２５ａは、車幅方向中間部に位置し、フロアトンネル１５の天面部１５ａの車両上方に間隔を空けて配置され、天面部１５ａを跨ぐように車幅方向に延びている。 The upper portion of the floor upper cross member 25 has an upper cross member upper surface portion 25a and an upper cross member upper inclined portion 25b. The upper cross member upper surface portion 25a is located in the middle portion in the vehicle width direction, is spaced above the vehicle top surface portion 15a of the floor tunnel 15, and extends in the vehicle width direction so as to straddle the top surface portion 15a.

上クロスメンバ上側傾斜部２５ｂは、フロア上クロスメンバ２５の左右両側に設けられ、上クロスメンバ上面部２５ａの車幅方向の外側端から外側に向かうに従い下方側に傾斜している部分である。上クロスメンバ上側傾斜部２５ｂは、例えば左側パネル１２のフロア傾斜部１２ｂの車幅方向外側に間隔を空けて配置されており、本実施形態では、水平方向に対する傾斜角度は、フロア傾斜部１２ｂの傾斜角度（略４５°）よりやや小さく設定されている。 The upper cross member upper inclined portions 25b are provided on both left and right sides of the floor upper cross member 25, and are portions that are inclined downward from the vehicle width direction outer end of the upper cross member upper surface portion 25a toward the outside. The upper cross member upper inclined portion 25b is arranged, for example, at a space outside the floor inclined portion 12b of the left panel 12 in the vehicle width direction. It is set slightly smaller than the inclination angle (approximately 45°).

図３に示すように、上クロスメンバ上側傾斜部２５ｂと、上クロスメンバ上面部２５ａとにより、上クロスメンバ上側角部２５ｃが形成されている。当該上クロスメンバ上側角部２５ｃの上部には、シートブラケット２８が設けられている。 As shown in FIG. 3, an upper cross member upper corner portion 25c is formed by the upper cross member upper inclined portion 25b and the upper cross member upper surface portion 25a. A seat bracket 28 is provided above the upper cross member upper corner portion 25c.

フロア上クロスメンバ２５の前部には、車両前方を臨む前壁部２５ｄ（図２）が設けられ、後部には、車両後方を臨む後壁部２５ｅ（図３）が設けられている。前壁部２５ｄの上部は、上クロスメンバ上面部２５ａ、左右両側の上クロスメンバ上側傾斜部２５ｂに沿って形成されている。また、後壁部２５ｅの上部は、前壁部２５ｄと同様に、上クロスメンバ上面部２５ａ、左右両側の上クロスメンバ上側傾斜部２５ｂに沿って形成されている。 A front wall portion 25d (FIG. 2) facing the vehicle front is provided at the front portion of the floor cross member 25, and a rear wall portion 25e (FIG. 3) facing the vehicle rear is provided at the rear portion. The upper portion of the front wall portion 25d is formed along the upper cross member upper surface portion 25a and the upper cross member upper inclined portions 25b on both left and right sides. Similarly to the front wall portion 25d, the upper portion of the rear wall portion 25e is formed along the upper cross member upper surface portion 25a and the left and right upper cross member upper inclined portions 25b.

また、前壁部２５ｄの下端には、車両前方側に突出する前側フランジが設けられ、後壁部２５ｅの下端には、車両後方側に突出する後側フランジが設けられている。前側フランジ及び後側フランジによって構成されるフロア上クロスメンバ２５の下部は、上クロスメンバ下面部２５ｆと、上クロスメンバ下側傾斜部２５ｇと、上クロスメンバ外側下面部２５ｈと、縦フランジ２５ｎと、を有している。 A front flange projecting toward the vehicle front side is provided at the lower end of the front wall portion 25d, and a rear flange projecting toward the vehicle rear side is provided at the lower end of the rear wall portion 25e. The lower portion of the floor upper cross member 25, which is formed by the front flange and the rear flange, includes an upper cross member lower surface portion 25f, an upper cross member lower inclined portion 25g, an upper cross member outer lower surface portion 25h, and a vertical flange 25n. ,have.

上クロスメンバ下面部２５ｆの車幅方向の左側部は、左側パネル１２の左側上面部１２ａに接合され、車幅方向の右側部は、右側パネル１３の右側上面部１３ａに接合されている。上クロスメンバ下面部２５ｆの車幅方向中央部は、車両上方側に凹んでおり、フロアトンネル１５の天面部１５ａ、左壁部１５ｂ及び右壁部１５ｃに接合されている。 The left portion of the upper cross member lower surface portion 25f in the vehicle width direction is joined to the left upper surface portion 12a of the left panel 12, and the right portion in the vehicle width direction is joined to the right upper surface portion 13a of the right panel 13. As shown in FIG. A center portion in the vehicle width direction of the upper cross member lower surface portion 25f is recessed toward the upper side of the vehicle, and is joined to the top surface portion 15a, the left wall portion 15b, and the right wall portion 15c of the floor tunnel 15. As shown in FIG.

上クロスメンバ下側傾斜部２５ｇは、フロア上クロスメンバ２５の左右両側に設けられ、上クロスメンバ下面部２５ｆの車幅方向外側端から外側に向かうに従い下方側に傾斜している部分であり、フロア傾斜部１２ｂの傾斜角度とほぼ同じ傾斜角度で傾斜し、フロア傾斜部１２ｂに接合されている。また、上クロスメンバ下側傾斜部２５ｇと、上クロスメンバ下面部２５ｆとにより上クロスメンバ下側角部２５ｋが形成されている。 The upper cross member lower inclined portions 25g are provided on both the left and right sides of the floor upper cross member 25, and are portions that are inclined downward toward the outside from the outer end of the upper cross member lower surface portion 25f in the vehicle width direction. It is inclined at an angle of inclination substantially the same as that of the inclined floor portion 12b, and is joined to the inclined floor portion 12b. An upper cross member lower corner portion 25k is formed by the upper cross member lower inclined portion 25g and the upper cross member lower surface portion 25f.

上クロスメンバ外側下面部２５ｈは、上クロスメンバ下側傾斜部２５ｇの下端から車幅方向外側に延び、例えば左側パネル１２の外側平面部１２ｃの上面に接合されている。縦フランジ２５ｎは、上クロスメンバ外側下面部２５ｈの車幅方向外側端から車両上方に突出しており、例えば左側パネル１２の外側フランジ部１２ｄに接合されている。なお、縦フランジ２５ｎの上端付近は、例えばサイドシル６の車幅方向内側面に接合されてもよい。また、上クロスメンバ下側傾斜部２５ｇの下端には、車幅方向外側に屈曲する外側角部２５ｍが形成されている。 The upper cross member outer lower surface portion 25h extends outward in the vehicle width direction from the lower end of the upper cross member lower inclined portion 25g and is joined to the upper surface of the outer flat portion 12c of the left panel 12, for example. The vertical flange 25n protrudes upward from the vehicle width direction outer end of the upper cross member outer lower surface portion 25h, and is joined to the outer flange portion 12d of the left panel 12, for example. The vicinity of the upper end of the vertical flange 25n may be joined to the vehicle width direction inner surface of the side sill 6, for example. An outer corner portion 25m that bends outward in the vehicle width direction is formed at the lower end of the lower inclined portion 25g of the upper cross member.

続いて、フロア下クロスメンバ２０について説明する。フロア下クロスメンバ２０は、図１に示すように、左右のフロアサイドメンバ２，３を連結するように車幅方向に延びている部材である。フロア下クロスメンバ２０は、中央部材２１と、左外側部材２２と、右外側部材２３と、を有している。 Next, the under-floor cross member 20 will be described. The under-floor cross member 20 is a member extending in the vehicle width direction so as to connect the left and right floor side members 2, 3, as shown in FIG. The underfloor cross member 20 has a central member 21 , a left outer member 22 and a right outer member 23 .

中央部材２１は、図１に示すように、フロアトンネル１５の開口を架け渡すように車幅方向に延びている。中央部材２１の上部における車幅方向の中央部は、フロアトンネル１５の天面部１５ａの下面（裏面）に接合されている。また、中央部の両側から車両下方に延びる縦壁部は、フロアトンネル１５の左壁部１５ｂ及び右壁部１５ｃに接合されている。すなわち、中央部材２１の車幅方向中央部の上部形状は、フロアトンネル１５の車幅方向の輪郭形状に沿っている。また、左壁部１５ｂ及び右壁部１５ｃには、左側パネル１２の内側フランジ部１２ｅ及び右側パネル１３の内側フランジ部１３ｅも接合されている。また、フロアトンネル１５の車幅方向外側端部１５ｗ１，１５ｗ２は、左側パネル１２の左側上面部１２ａの下面及び右側パネル１３の右側上面部１３ａの下面に接合されている。さらに、同じ個所でフロア上クロスメンバ２５とも接合されている。 The central member 21 extends in the vehicle width direction so as to bridge the opening of the floor tunnel 15, as shown in FIG. A central portion in the vehicle width direction of the upper portion of the central member 21 is joined to the lower surface (back surface) of the top surface portion 15 a of the floor tunnel 15 . Vertical wall portions extending downward from both sides of the central portion are joined to the left wall portion 15 b and the right wall portion 15 c of the floor tunnel 15 . That is, the shape of the upper part of the central portion in the vehicle width direction of the central member 21 follows the contour shape of the floor tunnel 15 in the vehicle width direction. An inner flange portion 12e of the left panel 12 and an inner flange portion 13e of the right panel 13 are also joined to the left wall portion 15b and the right wall portion 15c. The vehicle width direction outer ends 15w1 and 15w2 of the floor tunnel 15 are joined to the lower surface of the left upper surface portion 12a of the left panel 12 and the lower surface of the right upper surface portion 13a of the right panel 13, respectively. Furthermore, the cross member 25 on the floor is also joined at the same location.

続いて、フロア下クロスメンバ２０の左外側部材２２について説明する。左外側部材２２は、図１～図３に示すように、中央部材２１の車幅方向の左側部に接合され、車幅方向に延びている。左外側部材２２の車幅方向外側部は、左側のフロアサイドメンバ２に接合されている。左外側部材２２は、さらに車幅方向外側に延びて左側のフロアサイドメンバ２を横断して左側のサイドシル６に接合されている。左外側部材２２は、前壁部２２ａと、後壁部２２ｂと、下クロスメンバ下面部２２ｃと、下クロスメンバ下側傾斜部２２ｅと、を有している。 Next, the left outer member 22 of the underfloor cross member 20 will be described. As shown in FIGS. 1 to 3, the left outer member 22 is joined to the left side of the central member 21 in the vehicle width direction and extends in the vehicle width direction. A vehicle width direction outer portion of the left outer member 22 is joined to the left floor side member 2 . The left outer member 22 further extends outward in the vehicle width direction, traverses the left floor side member 2 and is joined to the left side sill 6 . The left outer member 22 has a front wall portion 22a, a rear wall portion 22b, a lower cross member lower surface portion 22c, and a lower cross member lower inclined portion 22e.

左外側部材２２の前壁部２２ａは、車両前方を臨む壁面を有し、車幅方向に延びている。左外側部材２２の前壁部２２ａの車幅方向内側部は、中央部材２１の車幅方向外側部に連続するように接合されている。左外側部材２２の前壁部２２ａの車幅方向外側部は、左側のフロアサイドメンバ２に接合されている。左外側部材２２の後壁部２２ｂも、前壁部２２ａと同様に構成されている。 The front wall portion 22a of the left outer member 22 has a wall surface facing the front of the vehicle and extends in the vehicle width direction. A front wall portion 22 a of the left outer member 22 has a vehicle width direction inner portion joined to a vehicle width direction outer portion of the central member 21 so as to be continuous therewith. A front wall portion 22 a of the left outer member 22 has a vehicle width direction outer portion joined to the left floor side member 2 . The rear wall portion 22b of the left outer member 22 is also configured similarly to the front wall portion 22a.

また、前壁部２２ａの上端には、図示は省略しているが、車両前方側に突出する前側フランジが設けられ、後壁部２２ｂの上端には、車両後方側に突出する後側フランジが設けられている。前側フランジ及び後側フランジによって構成される左外側部材２２の上部は、左側パネル１２の左側上面部１２ａ、フロア傾斜部１２ｂ及び外側平面部１２ｃに沿って延び、左側上面部１２ａ及びフロア傾斜部１２ｂに接合されている。後側フランジも、前側フランジと同様に構成されている。 A front flange (not shown) is provided at the upper end of the front wall portion 22a and projects toward the front side of the vehicle, and a rear flange is formed at the upper end of the rear wall portion 22b and projects toward the rear side of the vehicle. is provided. The upper portion of the left outer member 22 formed by the front flange and the rear flange extends along the left upper surface 12a, the floor inclined portion 12b and the outer flat portion 12c of the left panel 12, and extends along the left upper surface 12a and the floor inclined portion 12b. is joined to The rear flange is also constructed similarly to the front flange.

フロア下クロスメンバ２０の左外側部材２２の下部は、下クロスメンバ下面部２２ｃ及び下クロスメンバ下側傾斜部２２ｅによって構成されている。下クロスメンバ下面部２２ｃは、車幅方向中間部に位置し、前壁部２２ａの下端と後壁部２２ｂの下端とを繋ぎ、車幅方向に延びている。下クロスメンバ下面部２２ｃの車幅方向内側部は、中央部材２１の車幅方向外側部の下部に連続するように接合されている。 The lower portion of the left outer member 22 of the floor under cross member 20 is composed of a lower cross member lower surface portion 22c and a lower cross member lower inclined portion 22e. The lower cross member lower surface portion 22c is located in the middle portion in the vehicle width direction, connects the lower end of the front wall portion 22a and the lower end of the rear wall portion 22b, and extends in the vehicle width direction. The inner portion of the lower cross member lower surface portion 22c in the vehicle width direction is joined to the lower portion of the outer portion of the central member 21 in the vehicle width direction so as to be continuous.

下クロスメンバ下側傾斜部２２ｅは、該下クロスメンバ下面部２２ｃの車幅方向外側端から外側に向かうに従い下方側に傾斜し、例えば左側のフロアサイドメンバ２に接合されている。下クロスメンバ下側傾斜部２２ｅと、フロアサイドメンバ２の下面を車幅方向内側に延長する水平線とにより形成される傾斜角度は、上クロスメンバ下側傾斜部２５ｇの上記傾斜角度（略４５°）よりも小さく設定されている。 The lower cross member lower inclined portion 22e is inclined downward toward the outside from the outer end of the lower cross member lower surface portion 22c in the vehicle width direction, and is joined to the left floor side member 2, for example. The inclination angle formed by the lower cross member lower inclined portion 22e and the horizontal line extending inward in the vehicle width direction from the lower surface of the floor side member 2 is the above inclination angle (approximately 45°) of the upper cross member lower inclined portion 25g. ) is set smaller than

次に、右側部材２３は、中央部材２１の車幅方向の右側部に接合され、車幅方向に延びている。右外側部材２３は、左外側部材２２と左右対称となるように構成され、前壁部（図示せず）と、後壁部２３ｂと、下クロスメンバ下面部２３ｃと、下クロスメンバ下側傾斜部２３ｅと、を有している（図１） Next, the right member 23 is joined to the right side portion of the central member 21 in the vehicle width direction and extends in the vehicle width direction. The right outer member 23 is symmetrical to the left outer member 22, and includes a front wall portion (not shown), a rear wall portion 23b, a lower cross member lower surface portion 23c, and a lower cross member lower slope. and a portion 23e (FIG. 1)

本実施形態では、図３に示すように、上クロスメンバ上側角部２５ｃと上クロスメンバ下側角部２５ｋとを結ぶ基準線Ｌ１（図３の破線）が下クロスメンバ下側傾斜部２２ｅの下端に交差する交差点Ｐ１は、下クロスメンバ下面部２２ｃと下クロスメンバ下側傾斜部２２ｅとの接続部２２ｄよりも車幅方向外側に配置されている。なお、交差点Ｐ１は、接続部２２ｄよりも車両下方側に位置している。 In this embodiment, as shown in FIG. 3, the reference line L1 (broken line in FIG. 3) connecting the upper cross member upper corner portion 25c and the upper cross member lower corner portion 25k is the lower cross member lower inclined portion 22e. A crossing point P1 that intersects the lower end is arranged outside in the vehicle width direction of the connecting portion 22d between the lower cross member lower surface portion 22c and the lower cross member lower inclined portion 22e. In addition, the intersection P1 is positioned on the vehicle lower side of the connecting portion 22d.

フロア上クロスメンバ２５及びフロア下クロスメンバ２０の車幅方向外側部が、車体外方から側突を受けたとき、フロア下クロスメンバ２０は、下クロスメンバ下面部２２ｃと下クロスメンバ下側傾斜部２２ｅとの接続部２２ｄで変形しやすくなる。一方で、上記側突を受けたとき、上クロスメンバ上側角部２５ｃ及び上クロスメンバ下側角部２５ｋは、これらを結ぶ基準線Ｌ１に沿って変形しようとする。 When the vehicle width direction outer portions of the floor upper cross member 25 and the floor lower cross member 20 receive a side impact from the outside of the vehicle body, the floor lower cross member 20 is tilted toward the lower cross member lower surface portion 22c and the lower cross member lower side. It becomes easy to deform|transform at the connection part 22d with the part 22e. On the other hand, when receiving the side impact, the upper cross member upper corner portion 25c and the upper cross member lower corner portion 25k tend to deform along the reference line L1 connecting them.

本実施形態では、基準線Ｌ１と交差点Ｐ１に対して、上記したように変形しやすい接続部２２ｄは、車幅方向内側に配置されている。そのため、上記側突を受けたとき、当該交差点Ｐ１と接続部２２ｄとの間は、ほぼ直線的に傾斜して延びているので、側突等の車幅方向荷重に対して突っ張る力が作用する。 In the present embodiment, the connecting portion 22d that is easily deformable as described above is arranged on the inner side in the vehicle width direction with respect to the reference line L1 and the intersection P1. Therefore, when the side collision is received, the section between the intersection P1 and the connection portion 22d is inclined almost linearly, so that a thrusting force acts against the vehicle width direction load of the side collision or the like. .

このとき、フロア下クロスメンバ２０は、接続部２２ｄから基準線Ｌ１の傾斜方向の上方側に向かって潰れるように変形する。当該変形により、フロア下クロスメンバ２０が立ち上がる方向、すなわち車幅方向外側部を中心に上方に回転するように（図３における反時計回りに）変形する。 At this time, the under-floor cross member 20 is deformed so as to be crushed upward in the direction of inclination of the reference line L1 from the connecting portion 22d. Due to this deformation, the under-floor cross member 20 is deformed so as to rotate upward (counterclockwise in FIG. 3) centering on the rising direction, that is, the outer portion in the vehicle width direction.

さらに、フロア上クロスメンバ２５の上クロスメンバ上側傾斜部２５ｂも、同じ回転方向に変形する。すなわち、上クロスメンバ上側傾斜部２５ｂは、上クロスメンバ上側角部２５ｃを中心に図３における反時計回りに変形する。このような場合、フロア下クロスメンバ２０に対してフロア上クロスメンバ２５の方が、車両上方への変形量は小さくなる。そのため、本実施形態によれば、側突等の荷重を受けたときにフロア部が車両室内側に突出するような変形を抑制することが可能となる。 Further, the upper cross member upper inclined portion 25b of the floor upper cross member 25 is also deformed in the same rotational direction. That is, the upper cross member upper inclined portion 25b deforms counterclockwise in FIG. 3 around the upper cross member upper corner portion 25c. In such a case, the upper floor cross member 25 is deformed upwardly of the vehicle by a smaller amount than the lower floor cross member 20 . Therefore, according to the present embodiment, it is possible to suppress deformation such that the floor portion protrudes toward the interior of the vehicle when receiving a load such as a side collision.

また、上記したように、フロア上クロスメンバ２５の下部には、外側角部２５ｍが設けられている。一方で、フロアサイドメンバ２，３は、車両前後方向視で略四角形状の閉断面を有しており、フロアサイドメンバ２，３の上部の車幅方向内側部には、内側角部５が形成されている。外側角部２５ｍは、内側角部５に対して、車幅方向内側に配置されている。 Further, as described above, the lower portion of the upper floor cross member 25 is provided with the outer corner portion 25m. On the other hand, the floor side members 2 and 3 have a substantially rectangular closed cross-section when viewed in the front-rear direction of the vehicle. formed. The outer corner portion 25m is arranged inside the inner corner portion 5 in the vehicle width direction.

上記のように外側角部２５ｍ及び内側角部５は、その周辺に対して剛性が高い部位である。そのため、上記のような側突を受けたとき、外側角部２５ｍと内側角部５との間の下方に位置するフロア下クロスメンバ２０（左右の外側部材２２，２３）は、外側角部２５ｍ及び内側角部５よりも剛性が低いため、潰れやすくなる。その結果、フロア下クロスメンバ２０及びフロア上クロスメンバ２５の回転する変形をしやすくすることがで、フロア部が車両室内に突出する変形の抑制効果を高めることができる。 As described above, the outer corner portion 25m and the inner corner portion 5 are portions having high rigidity with respect to their surroundings. Therefore, when subjected to a side impact as described above, the under-floor cross member 20 (the left and right outer members 22 and 23) located below between the outer corner portion 25m and the inner corner portion 5 will be pushed to the outer corner portion 25m. And since the rigidity is lower than that of the inner corner portion 5, it is easily crushed. As a result, the under-floor cross member 20 and the above-floor cross member 25 can be easily deformed to rotate, and the effect of suppressing the deformation of the floor portion to project into the vehicle interior can be enhanced.

左右のフロアサイドメンバ２，３の閉断面の内部には、補強部材４が設けられている。当該補強部材４は、閉断面を構成する壁面に接合される板状の部材で、中央に孔が設けられている。例えば、左側の補強部材４は、左側のフロアサイドメンバ２と左側外側部材２２とが接合されている位置に隣接して設けられている。右側の補強部材４についても同様に配置されている。 A reinforcing member 4 is provided inside the closed cross section of the left and right floor side members 2 and 3 . The reinforcing member 4 is a plate-like member that is joined to the wall surface forming a closed cross section, and has a hole in the center. For example, the left reinforcing member 4 is provided adjacent to the position where the left floor side member 2 and the left outer member 22 are joined. The reinforcing member 4 on the right side is similarly arranged.

補強部材４を設けることにより、フロアサイドメンバ２，３の強度が向上する。その結果、補強部材４が位置するフロアサイドメンバ２，３と、当該位置よりも車幅方向内側の部分との強度の差が大きくなる。その結果、上記した外側角部２５ｍと内側角部５との間の下方に位置するフロア下クロスメンバ２０は、より潰れやすくなる。 By providing the reinforcing member 4, the strength of the floor side members 2 and 3 is improved. As a result, the difference in strength between the floor side members 2 and 3 where the reinforcing member 4 is positioned and the portion on the inner side in the vehicle width direction of the position is increased. As a result, the underfloor cross member 20 positioned below between the outer corner portion 25m and the inner corner portion 5 is more likely to be crushed.

また、本実施形態の下クロスメンバ下側傾斜部２２ｅの下端には、車幅方向外側に延長する延長部２２ｆが設けられている。例えば左側の延長部２２ｆの車幅方向中間部は、左側のフロアサイドメンバ２の下部に接合されており、左側の延長部２２ｆの車幅方向左外側部は、左側のサイドシル６の下部に接合されている。右側の延長部２３ｆも、左側の延長部２２ｆと同様に構成されている。このように構成することで、側突等の荷重を受けたときに、サイドシル６がクロスメンバ２０，２５に対して独立して回転することを抑制することができる。 Further, an extension portion 22f extending outward in the vehicle width direction is provided at the lower end of the lower cross member lower inclined portion 22e of the present embodiment. For example, the middle portion in the vehicle width direction of the left extension portion 22f is joined to the lower portion of the left floor side member 2, and the left outer portion in the vehicle width direction of the left extension portion 22f is joined to the lower portion of the left side sill 6. It is The right extension 23f is also configured in the same manner as the left extension 22f. With this configuration, it is possible to prevent the side sill 6 from rotating independently of the cross members 20 and 25 when a load such as a side collision is received.

また、図示による説明は省略しているが、フロア上クロスメンバ２５の車両前方側には、車幅方向に延びるクロスメンバが設けられている。当該クロスメンバは、フロア上クロスメンバに対して間隔を空けて配置されている。該クロスメンバの上部には、シートブラケットが設けられている。また、このクロスメンバと、フロア上クロスメンバ２５との間に位置するフロアパネル（例えば、右側パネル）は、平坦としてもよいし、開口を設けてもよい。開口を設ける場合、当該開口に、上方に開口する箱状のパネル材を固定し、当該パネル材の内側にリチウムイオンバッテリ等を配置してもよい。 Although not illustrated, a cross member extending in the vehicle width direction is provided on the vehicle front side of the floor cross member 25 . The cross-member is spaced apart from the on-floor cross-member. A seat bracket is provided on the upper portion of the cross member. Also, the floor panel (for example, the right panel) positioned between this cross member and the above-floor cross member 25 may be flat or may be provided with an opening. When an opening is provided, a box-shaped panel material that opens upward may be fixed to the opening, and a lithium ion battery or the like may be arranged inside the panel material.

本実施形態の説明は、本発明を説明するための例示であって、特許請求の範囲に記載の発明を限定するものではない。また、本発明の各部構成は上記実施形態に限らず、特許請求の範囲に記載の技術的範囲内で種々の変形が可能である。 The description of the present embodiment is an example for describing the present invention, and does not limit the invention described in the claims. Moreover, the configuration of each part of the present invention is not limited to the above-described embodiment, and various modifications are possible within the technical scope described in the claims.

例えば、本実施形態では、フロア下クロスメンバ２０を、３つの部材（中央部材２１、左外側部材２２及び右外側部材２３）で構成しているが、これに限らない。車幅方向に延びる１本の部材で構成してもよい。 For example, in the present embodiment, the under-floor cross member 20 is composed of three members (the central member 21, the left outer member 22, and the right outer member 23), but it is not limited to this. It may be composed of a single member extending in the vehicle width direction.

２ 左側のフロアサイドメンバ
３ 右側のフロアサイドメンバ
４ 補強部材
５ 内側角部
６ 左側のサイドシル
７ 右側のサイドシル
１０ フロアパネル
１２ 左側パネル
１２ａ 左側上面部（パネル平面部）
１２ｂ フロア傾斜部
１２ｃ 外側平面部
１２ｄ 外側フランジ部
１２ｅ 内側フランジ部
１３ 右側パネル
１３ａ 右側上面部（パネル平面部）
１３ｅ 内側フランジ部
１５ フロアトンネル
１５ａ 天面部
１５ｂ 左壁部
１５ｃ 右壁部
１５ｄ 左側下面部
１５ｅ 右側下面部
２０ フロア下クロスメンバ
２１ 中央部材
２２ 左外側部材
２２ａ 前壁部（左だけ）
２２ｂ 後壁部
２２ｃ 下クロスメンバ下面部
２２ｄ 接続部
２２ｅ 下クロスメンバ下側傾斜部
２２ｆ 延長部
２３ 右外側部材
２３ｂ 後壁部
２３ｃ 下クロスメンバ下面部
２３ｄ 接続部
２３ｅ 下クロスメンバ傾斜部
２３ｆ 延長部
２５ フロア上クロスメンバ
２５ａ 上クロスメンバ上面部
２５ｂ 上クロスメンバ上側傾斜部
２５ｃ 上クロスメンバ上側角部
２５ｄ 前壁部
２５ｅ 後壁部
２５ｆ 上クロスメンバ下面部
２５ｇ 上クロスメンバ下側傾斜部
２５ｈ 上クロスメンバ外側下面部
２５ｋ 上クロスメンバ下側角部
２５ｍ 外側角部
２５ｎ 縦フランジ
２８ シートブラケット
Ｌ１ 基準線
Ｐ１ 交差点


2 Left floor side member 3 Right floor side member 4 Reinforcing member 5 Inner corner 6 Left side sill 7 Right side sill 10 Floor panel 12 Left panel 12a Left upper surface (panel plane)
12b Floor inclined portion 12c Outer flat portion 12d Outer flange portion 12e Inner flange portion 13 Right panel 13a Right upper surface portion (panel flat portion)
13e Inner flange portion 15 Floor tunnel 15a Top surface portion 15b Left wall portion 15c Right wall portion 15d Left lower surface portion 15e Right lower surface portion 20 Underfloor cross member 21 Central member 22 Left outer member 22a Front wall portion (left only)
22b rear wall portion 22c lower cross member lower surface portion 22d connecting portion 22e lower cross member lower inclined portion 22f extension portion 23 right outer member 23b rear wall portion 23c lower cross member lower surface portion 23d connecting portion 23e lower cross member inclined portion 23f extension portion 25 Floor upper cross member 25a Upper cross member upper surface portion 25b Upper cross member upper inclined portion 25c Upper cross member upper corner portion 25d Front wall portion 25e Rear wall portion 25f Upper cross member lower surface portion 25g Upper cross member lower inclined portion 25h Upper cross Member outer lower surface portion 25k Upper cross member lower corner portion 25m Outer corner portion 25n Vertical flange 28 Seat bracket L1 Reference line P1 Intersection

Claims (4)

フロアパネルの下面側の車幅方向両側部に配置され、車両前後方向に延びるフロアサイドメンバと、前記各フロアサイドメンバの車幅方向外側に配置され、車両前後方向に延びるサイドシルと、前記フロアパネルの上面に配置され、両側の前記サイドシルを連結するように車幅方向に延びるフロア上クロスメンバと、を有し、
前記フロアパネルは、車幅方向中間部に位置するパネル平面部が車幅方向両側部に対して車両上方に位置し、車両前方視で凸形状となっている、車体下部構造において、
前記フロアパネルの下面には、平面視で前記フロア上クロスメンバに重なる位置で、車幅方向に延びるフロア下クロスメンバが設けられており、
前記フロア上クロスメンバの上部は、車幅方向中間部に位置する上クロスメンバ上面部と、該上クロスメンバ上面部の車幅方向外側端から外側に向かうに従い下方側に傾斜する上クロスメンバ上側傾斜部とを有し、該上クロスメンバ上側傾斜部と前記上クロスメンバ上面部とにより上クロスメンバ上側角部が形成され、
前記フロア上クロスメンバの下部は、前記パネル平面部に接合される上クロスメンバ下面部と、該上クロスメンバ下面部の車幅方向外側端から外側に向かうに従い下方側に傾斜し、前記パネル平面部の車幅方向外側に位置する上クロスメンバ下側傾斜部とを有し、該上クロスメンバ下側傾斜部と前記上クロスメンバ下面部とにより上クロスメンバ下側角部が形成され、
前記フロア下クロスメンバの下部は、車幅方向中間部に位置する下クロスメンバ下面部と、該下クロスメンバ下面部の車幅方向外側端から外側に向かうに従い下方側に傾斜する下クロスメンバ下側傾斜部とを有し、該下クロスメンバ下側傾斜部の傾斜角は、前記上クロスメンバ下側傾斜部の傾斜角よりも小さく設定され、
前記上クロスメンバ上側角部と前記上クロスメンバ下側角部とを結ぶ基準線が前記下クロスメンバ下側傾斜部の下面に交差する位置は、前記下クロスメンバ下面部と前記下クロスメンバ下側傾斜部との接続部よりも車幅方向外側に配置されていることを特徴とする、車体下部構造。 Floor side members arranged on both sides in the vehicle width direction on the lower surface side of the floor panel and extending in the vehicle front-rear direction; Side sills arranged outside the floor side members in the vehicle width direction and extending in the vehicle front-rear direction; an upper floor cross member arranged on the upper surface of the and extending in the vehicle width direction so as to connect the side sills on both sides;
In the vehicle body lower part structure, the floor panel has a flat panel portion located in the middle portion in the vehicle width direction, which is located above the vehicle with respect to both side portions in the vehicle width direction, and has a convex shape when viewed from the front of the vehicle,
A lower floor cross member extending in the vehicle width direction is provided on the lower surface of the floor panel at a position overlapping the upper floor cross member in a plan view,
The upper part of the floor upper cross member includes an upper cross member upper surface located in the vehicle width direction intermediate part, and an upper cross member upper side inclined downward as going outward from the vehicle width direction outer end of the upper cross member upper surface part. an upper cross member upper corner portion is formed by the upper cross member upper inclined portion and the upper cross member upper surface portion;
A lower portion of the floor upper cross member includes an upper cross member lower surface portion that is joined to the panel plane portion, and an upper cross member lower surface portion that is inclined downward as it goes outward from the vehicle width direction outer end of the upper cross member lower surface portion, and the panel plane. an upper cross member lower inclined portion located on the outside in the vehicle width direction of the upper cross member, the upper cross member lower inclined portion and the upper cross member lower surface forming an upper cross member lower corner,
The lower part of the under-floor cross member includes a lower cross member lower surface portion positioned at a vehicle width direction intermediate portion, and a lower cross member lower surface portion that slopes downward toward the outside from the vehicle width direction outer end of the lower cross member lower surface portion. an inclination angle of the lower cross member lower inclination part is set smaller than an inclination angle of the upper cross member lower inclination part,
The position where the reference line connecting the upper cross member upper corner portion and the upper cross member lower corner portion intersects the lower surface of the lower cross member lower inclined portion is the lower cross member lower surface portion and the lower cross member lower surface portion. A vehicle body lower part structure, characterized in that it is arranged outside in the vehicle width direction from a connection part with a side inclined part. 前記上クロスメンバ下側傾斜部の下端には、車幅方向外側に屈曲する外側角部が形成されており、該外側角部は、前記フロアサイドメンバの車幅方向内側の上部に形成されている内側角部に対して、車幅方向内側に配置されていることを特徴とする、請求項１に記載の車体下部構造。 An outer corner bent outward in the vehicle width direction is formed at the lower end of the lower inclined portion of the upper cross member, and the outer corner is formed at the upper portion of the floor side member on the inner side in the vehicle width direction. 2. The vehicle body lower structure according to claim 1, wherein the inner corner portion is arranged on the inner side in the vehicle width direction. 前記フロアサイドメンバの閉断面の内部には、補強部材が設けられており、
前記補強部材は、前記フロア下クロスメンバの車幅方向外側部が前記フロアサイドメンバに接合されている位置に設けられていることを特徴とする、請求項１または請求項２に記載の車体下部構造。 A reinforcing member is provided inside the closed cross-section of the floor side member,
3. The lower vehicle body according to claim 1, wherein the reinforcing member is provided at a position where the vehicle width direction outside portion of the under-floor cross member is joined to the floor side member. structure. 前記フロア下クロスメンバの車幅方向外側端部は、前記フロアサイドメンバを横断して前記サイドシルに接合されていることを特徴とする、請求項１ないし請求項３のいずれか一項に記載の車体下部構造。


4. The underfloor cross member according to any one of claims 1 to 3, wherein the vehicle width direction outer end portion of the underfloor cross member crosses the floor side member and is joined to the side sill. Underbody structure.
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CN202010788814.1A CN112441138B (en) 2019-08-30 2020-08-07 Vehicle body lower structure
FR2008700A FR3100216A1 (en) 2019-08-30 2020-08-26 LOWER VEHICLE BODY STRUCTURE

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