JP7040380B2

JP7040380B2 - Rear body structure of the vehicle

Info

Publication number: JP7040380B2
Application number: JP2018179222A
Authority: JP
Inventors: 英行塚本; 晃義益田; 幸治松下; 秀典松岡
Original assignee: Mazda Motor Corp
Current assignee: Mazda Motor Corp
Priority date: 2018-09-25
Filing date: 2018-09-25
Publication date: 2022-03-23
Anticipated expiration: 2038-09-25
Also published as: JP2020050030A

Description

本発明は、車両の後部車体構造に関する。 The present invention relates to the rear body structure of a vehicle.

車両の後部車体構造として、車両の車室に設けられたフロアトンネルと、フロアトンネルの後方に設けられたリヤサイドフレームと、フロアトンネルとリヤサイドフレームとを連結する後部補強フレームとを備えるものがある（特許文献１参照）。 As the rear body structure of the vehicle, there is a floor tunnel provided in the passenger compartment of the vehicle, a rear side frame provided behind the floor tunnel, and a rear reinforcing frame connecting the floor tunnel and the rear side frame ( See Patent Document 1).

特開２０１３－１６３４７０号公報Japanese Unexamined Patent Publication No. 2013-163470

このような車両の後部車体構造において、フロアトンネルの上面と後部補強フレームの上面とが上下方向にオフセットして配置されている場合には、車両の後面衝突（以下、後突という）時に、後突荷重が後部補強フレームからフロアトンネルへと効率的に伝達されにくい。 In such a rear body structure of a vehicle, when the upper surface of the floor tunnel and the upper surface of the rear reinforcing frame are arranged so as to be offset in the vertical direction, the rear surface of the vehicle collides (hereinafter referred to as a rear collision). It is difficult to efficiently transfer the thrust load from the rear reinforcement frame to the floor tunnel.

本発明は、車両の後突時の後突荷重を車両の前方に効率よく伝達できる車両の後部車体構造を提供することを目的とする。 An object of the present invention is to provide a rear body structure of a vehicle capable of efficiently transmitting a rear collision load at the time of a rear collision of the vehicle to the front of the vehicle.

本願の請求項１に記載の発明は、車両の後部車体構造であって、車両前後方向に延びた車幅方向に一対のリヤフレームと、車幅方向に延び、車幅方向の両端部が前記一対のリヤフレームにそれぞれ接合されたリヤクロスメンバと、前記リヤクロスメンバの前方に設けられ、車幅方向に延びたクロスメンバと、車両前後方向に延び、前記リヤクロスメンバと前記クロスメンバとを連結する補強部材と、前記補強部材よりも下方に配置され、前記クロスメンバから前方に延びた構造体とを備え、前記補強部材は、前記補強部材の先端部で前記クロスメンバの上面に上下方向に接合されており、前記補強部材は、車両の前後方向に交差する断面において、閉断面を形成し、前記補強部材は、前記補強部材の前部において、前方に向かって下方に湾曲するとともに、前方に向かって車幅方向に拡幅していることを特徴とする。
The invention according to claim 1 of the present application is a rear body structure of a vehicle, wherein a pair of rear frames extend in the vehicle width direction extending in the vehicle front-rear direction and both ends extending in the vehicle width direction are described above. A rear cross member joined to each pair of rear frames, a cross member provided in front of the rear cross member and extending in the vehicle width direction, and a rear cross member and the cross member extending in the vehicle front-rear direction are provided. A reinforcing member to be connected and a structure arranged below the reinforcing member and extending forward from the cross member are provided, and the reinforcing member is vertically directed on the upper surface of the cross member at the tip of the reinforcing member. The reinforcing member forms a closed cross section in a cross section intersecting the front-rear direction of the vehicle, and the reinforcing member is curved downward toward the front in the front portion of the reinforcing member. It is characterized by widening in the vehicle width direction toward the front .

また、請求項２に記載の発明は、前記請求項１に記載の発明において、前記補強部材は、前記補強部材の前部に設けられ、前記クロスメンバの前記上面に沿って延びる補強部材前側フランジ部を備え、前記補強部材は、前記補強部材前側フランジ部において前記クロスメンバの前記上面に上下方向に接合されていることを特徴とする。 The invention according to claim 2 is the invention according to claim 1, wherein the reinforcing member is provided on the front portion of the reinforcing member, and the front flange of the reinforcing member extends along the upper surface of the cross member. The reinforcing member is provided with a portion, and the reinforcing member is vertically joined to the upper surface of the cross member at the flange portion on the front side of the reinforcing member.

また、請求項３に記載の発明は、前記請求項１又は２に記載の発明において、車両前後方向に延び、前記クロスメンバの車幅方向の両端部がそれぞれ連結された一対のサイドシルを備え、前記クロスメンバは、車幅方向の中央部から車幅方向の外側に向かって下方に傾斜しており、前記補強部材は、前記クロスメンバの車幅方向の中央部に接合されていることを特徴とする。 The invention according to claim 3 includes a pair of side sills extending in the front-rear direction of the vehicle and having both ends in the vehicle width direction of the cross member connected to each other in the invention according to claim 1 or 2. The cross member is inclined downward from the central portion in the vehicle width direction toward the outside in the vehicle width direction, and the reinforcing member is joined to the central portion in the vehicle width direction of the cross member. And.

また、請求項４に記載の発明は、前記請求項１から３のいずれか１項に記載の発明において、前記構造体は、車両前後方向に延びるセンタトンネルであることを特徴とする。 The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein the structure is a center tunnel extending in the front-rear direction of the vehicle.

また、請求項５に記載の発明は、前記請求項１から４のいずれか１項に記載の発明において、車両前後方向に延び、前記クロスメンバと前記構造体とを連結する連結部材を備えることを特徴とする。
Further, the invention according to claim 5 is provided with a connecting member extending in the front-rear direction of the vehicle and connecting the cross member and the structure in the invention according to any one of claims 1 to 4. It is characterized by.

また、請求項６に記載の発明は、前記請求項５に記載の発明において、前記補強部材と、前記クロスメンバと、前記連結部材とは、共に接合されていることを特徴とする。
Further, the invention according to claim 6 is characterized in that, in the invention according to claim 5, the reinforcing member, the cross member, and the connecting member are joined together.

また、請求項７に記載の発明は、車両の車体後部構造であって、車両前後方向に延びた車幅方向に一対のリヤフレームと、車幅方向に延び、車幅方向の両端部が前記一対のリヤフレームにそれぞれ接合されたリヤクロスメンバと、前記リヤクロスメンバの前方に設けられ、車幅方向に延びたクロスメンバと、車両前後方向に延び、前記リヤクロスメンバと前記クロスメンバとを連結する補強部材と、前記補強部材よりも下方に配置され、前記クロスメンバから前方に延びた構造体とを備え、前記補強部材は、前記補強部材の先端部で前記クロスメンバの上面に上下方向に接合されており、車両前後方向に延び、前記クロスメンバと前記構造体とを連結する連結部材を備え、前記補強部材と、前記クロスメンバと、前記連結部材とは、共に接合されていることを特徴とする。
The invention according to claim 7 is a vehicle body rear structure, wherein a pair of rear frames extend in the vehicle width direction extending in the vehicle front-rear direction and both ends extending in the vehicle width direction are described above. A rear cross member joined to each pair of rear frames, a cross member provided in front of the rear cross member and extending in the vehicle width direction, and a rear cross member and the cross member extending in the vehicle front-rear direction are provided. A reinforcing member to be connected and a structure arranged below the reinforcing member and extending forward from the cross member are provided, and the reinforcing member is vertically directed on the upper surface of the cross member at the tip of the reinforcing member. It is provided with a connecting member that extends in the front-rear direction of the vehicle and connects the cross member and the structure, and the reinforcing member, the cross member, and the connecting member are joined together. It is characterized by.

請求項１に記載の発明によれば、後突時に、後突荷重をリヤフレームから、リヤクロスメンバ、補強部材、及びクロスメンバを介して、構造体に伝達するロードパスが形成されている。また、補強部材がクロスメンバの上面に上下方向に接合されているので、補強部材とクロスメンバとの接合部には、補強部材に入力された車両前後方向の後突荷重が接合方向に対する剪断方向の荷重として伝達される。すなわち、補強部材とクロスメンバとの間に引張・圧縮方向に荷重が入力されにくいので、補強部材とクロスメンバとが剥離することを抑制できる。このため、補強部材と構造体とが上下方向にオフセットして配置されている場合であっても、後突時の後突荷重をリヤフレームから車両前方へと効率よく伝達できる。また、補強部材が車両前後方向に交差する断面において、閉断面を形成しているため、補強部材の車両前後方向の強度が向上する。このため、車両の後突時の後突荷重によって補強部材が車両前後方向に変形することを抑制でき、車両の後突時の後突荷重を車両前方へ効果的に伝達できる。また、補強部材が前方に向かって下方に湾曲しているので、補強部材と構造体との間の高低差の差を吸収できる。また、補強部材が前方に向かって車幅方向に拡幅していることで、補強部材が形成する閉断面の断面積が前方に向かって増加するので、補強部材の剛性が向上する。これにより、後突時に補強部材が変形することを抑制しつつ、補強部材と構造体との間の高低差を吸収できる。
According to the first aspect of the present invention, a load path is formed in which the rear collision load is transmitted from the rear frame to the structure via the rear cross member, the reinforcing member, and the cross member at the time of the rear collision. Further, since the reinforcing member is joined to the upper surface of the cross member in the vertical direction, the rear collision load in the vehicle front-rear direction input to the reinforcing member is applied to the joint portion between the reinforcing member and the cross member in the shearing direction with respect to the joining direction. Is transmitted as a load of. That is, since it is difficult for a load to be input between the reinforcing member and the cross member in the tension / compression direction, it is possible to prevent the reinforcing member and the cross member from peeling off. Therefore, even when the reinforcing member and the structure are arranged so as to be offset in the vertical direction, the rear collision load at the time of rear collision can be efficiently transmitted from the rear frame to the front of the vehicle. Further, since the reinforcing member forms a closed cross section in the cross section where the reinforcing member intersects in the vehicle front-rear direction, the strength of the reinforcing member in the vehicle front-rear direction is improved. Therefore, it is possible to suppress the reinforcing member from being deformed in the front-rear direction of the vehicle due to the rear collision load at the time of the rear collision of the vehicle, and it is possible to effectively transmit the rear collision load at the time of the rear collision of the vehicle to the front of the vehicle. Further, since the reinforcing member is curved downward toward the front, the difference in height between the reinforcing member and the structure can be absorbed. Further, since the reinforcing member widens toward the front in the vehicle width direction, the cross-sectional area of the closed cross section formed by the reinforcing member increases toward the front, so that the rigidity of the reinforcing member is improved. As a result, it is possible to absorb the height difference between the reinforcing member and the structure while suppressing the deformation of the reinforcing member at the time of rear collision.

請求項２に記載の発明によれば、補強部材がクロスメンバの上面に沿って延びる補強部材前側フランジ部においてクロスメンバの上面に上下方向に接合されているので、本発明を好適に実施できる。 According to the second aspect of the present invention, since the reinforcing member is vertically joined to the upper surface of the cross member at the flange portion on the front side of the reinforcing member extending along the upper surface of the cross member, the present invention can be preferably carried out.

請求項３に記載の発明によれば、車両の後突時に補強部材からクロスメンバに車両前後方向の後突荷重が伝達された場合には、クロスメンバがサイドシルに連結されたクロスメンバの両端部を中心として前方へ倒れ易くなる。このため、車両の後突時の車両前後方向の後突荷重がクロスメンバに伝達した場合でも、クロスメンバの潰れ変形が抑制されるので、後突荷重を構造体に効率よく伝達できる。 According to the third aspect of the present invention, when the rear collision load in the vehicle front-rear direction is transmitted from the reinforcing member to the cross member at the time of the rear collision of the vehicle, both ends of the cross member in which the cross member is connected to the side sill. It becomes easy to fall forward around. Therefore, even when the rear collision load in the vehicle front-rear direction at the time of the rear collision of the vehicle is transmitted to the cross member, the crushing deformation of the cross member is suppressed, so that the rear collision load can be efficiently transmitted to the structure.

請求項４に記載の発明によれば、構造体が、例えばダッシュパネルのような車両前方に配置される他の構成要素と連結されるセンタトンネルであるため、車両の後突時の後突荷重を車両前方へと確実に伝達できる。 According to the fourth aspect of the present invention, since the structure is a center tunnel connected to other components arranged in front of the vehicle such as a dash panel, the rear collision load at the time of a rear collision of the vehicle Can be reliably transmitted to the front of the vehicle.

請求項５に記載の発明によれば、連結部材によって、車両の後突時にクロスメンバに伝達される車両前後方向の後突荷重が支持されるとともに、後突荷重が構造体に伝達されるので、車両の後突時の後突荷重を車両前方へ効果的に伝達できる。
According to the fifth aspect of the present invention, the connecting member supports the rear collision load in the vehicle front-rear direction transmitted to the cross member at the time of the rear collision of the vehicle, and the rear collision load is transmitted to the structure. , The rear collision load at the time of the rear collision of the vehicle can be effectively transmitted to the front of the vehicle.

請求項６に記載の発明によれば、補強部材がクロスメンバに加えて連結部材と接合されているため、後突荷重が補強部材からクロスメンバと連結部材とに分散して構造体に伝達されるので、車両の後突時の後突荷重を車両前方へ効果的に伝達できる。
According to the invention of claim 6, since the reinforcing member is joined to the connecting member in addition to the cross member, the rear collision load is dispersed from the reinforcing member to the cross member and the connecting member and transmitted to the structure. Therefore, the rear collision load at the time of the rear collision of the vehicle can be effectively transmitted to the front of the vehicle.

請求項７に記載の発明によれば、後突時に、後突荷重をリヤフレームから、リヤクロスメンバ、補強部材、及びクロスメンバを介して、構造体に伝達するロードパスが形成されている。また、補強部材がクロスメンバの上面に上下方向に接合されているので、補強部材とクロスメンバとの接合部には、補強部材に入力された車両前後方向の後突荷重が接合方向に対する剪断方向の荷重として伝達される。すなわち、補強部材とクロスメンバとの間に引張・圧縮方向に荷重が入力されにくいので、補強部材とクロスメンバとが剥離することを抑制できる。このため、補強部材と構造体とが上下方向にオフセットして配置されている場合であっても、後突時の後突荷重をリヤフレームから車両前方へと効率よく伝達できる。また、連結部材によって、車両の後突時にクロスメンバに伝達される車両前後方向の後突荷重が支持されるとともに、後突荷重が構造体に伝達されるので、車両の後突時の後突荷重を車両前方へ効果的に伝達できる。また、補強部材がクロスメンバに加えて連結部材と接合されているため、後突荷重が補強部材からクロスメンバと連結部材とに分散して構造体に伝達されるので、車両の後突時の後突荷重を車両前方へ効果的に伝達できる。
According to the invention of claim 7 , a load path is formed in which the rear collision load is transmitted from the rear frame to the structure via the rear cross member, the reinforcing member, and the cross member at the time of rear collision. Further, since the reinforcing member is joined to the upper surface of the cross member in the vertical direction, the rear collision load in the vehicle front-rear direction input to the reinforcing member is applied to the joint portion between the reinforcing member and the cross member in the shearing direction with respect to the joining direction. Is transmitted as a load of. That is, since it is difficult for a load to be input between the reinforcing member and the cross member in the tension / compression direction, it is possible to prevent the reinforcing member and the cross member from peeling off. Therefore, even when the reinforcing member and the structure are arranged so as to be offset in the vertical direction, the rear collision load at the time of rear collision can be efficiently transmitted from the rear frame to the front of the vehicle. Further , the connecting member supports the rear collision load in the vehicle front-rear direction transmitted to the cross member at the time of the rear collision of the vehicle, and the rear collision load is transmitted to the structure at the time of the rear collision of the vehicle. The load can be effectively transmitted to the front of the vehicle. Further, since the reinforcing member is joined to the connecting member in addition to the cross member, the rear collision load is dispersed from the reinforcing member to the cross member and the connecting member and transmitted to the structure. The rear collision load can be effectively transmitted to the front of the vehicle.

本発明の実施形態に係る後部車体構造の斜視図。The perspective view of the rear body structure which concerns on embodiment of this invention. 実施形態に係る後部車体構造の上面図。Top view of the rear body structure according to the embodiment. 図２のＩＩＩ－ＩＩＩ線に沿った断面図。FIG. 2 is a cross-sectional view taken along the line III-III of FIG. 図２のＩＶ－ＩＶ線に沿った断面図。FIG. 2 is a cross-sectional view taken along the line IV-IV of FIG. 図２のＶ－Ｖ線に沿った断面図。FIG. 2 is a cross-sectional view taken along the line VV of FIG. 実施形態に係るクロスメンバの車幅方向の中央部付近を示す要部拡大斜視図。An enlarged perspective view of a main part showing the vicinity of the central portion in the vehicle width direction of the cross member according to the embodiment.

以下、添付の図面を参照して、本発明に係る一実施形態を説明する。なお、以下の説明は、本質的に例示に過ぎず、本発明、その適用物、あるいは、その用途を制限することを意図するものではない。また、図面は模式的なものであり、各距離の比率等は現実のものとは相違している。 Hereinafter, an embodiment according to the present invention will be described with reference to the accompanying drawings. It should be noted that the following description is merely an example and is not intended to limit the present invention, its application, or its use. In addition, the drawings are schematic, and the ratio of each distance is different from the actual one.

図１及び図２を参照すると、本実施形態の後部車体構造を有する車体１は、車室の底面を形成するフロアパネル１０と、フロアパネル１０の車幅方向両側に接合されており、車両前後方向に延びる左右一対のサイドシル２０とを備える。 Referring to FIGS. 1 and 2, the vehicle body 1 having the rear vehicle body structure of the present embodiment is joined to the floor panel 10 forming the bottom surface of the vehicle interior on both sides of the floor panel 10 in the vehicle width direction, and is connected to the front and rear of the vehicle. It is provided with a pair of left and right side sills 20 extending in the direction.

図３を併せて参照すると、フロアパネル１０には、フロアパネル１０の車幅方向の中央に配置され、上方に膨出して車両前後方向に延びたセンタトンネル１１が設けられている。センタトンネル１１は、前方においてダッシュパネル（図示せず）と連結されている。また、センタトンネル１１の上面の車幅方向の両側には、車両前後方向に延びるトンネル補強部材１２が取り付けられている。トンネル補強部材１２は、センタトンネル１１と共に車両前後方向に延びる閉断面を構成している。なお、センタトンネル１１は、本発明における構造体の一例である。 Referring to FIG. 3, the floor panel 10 is provided with a center tunnel 11 which is arranged in the center of the floor panel 10 in the vehicle width direction and which bulges upward and extends in the vehicle front-rear direction. The center tunnel 11 is connected to a dash panel (not shown) in front of the center tunnel 11. Further, tunnel reinforcing members 12 extending in the front-rear direction of the vehicle are attached to both sides of the upper surface of the center tunnel 11 in the vehicle width direction. The tunnel reinforcing member 12 and the center tunnel 11 form a closed cross section extending in the front-rear direction of the vehicle. The center tunnel 11 is an example of the structure in the present invention.

また、フロアパネル１０の下面には、センタトンネル１１の車幅方向両側に配置され車両前後方向に延びた左右一対のフロアフレーム１３が設けられている。フロアフレーム１３は、フロアパネル１０と共に車両前後方向に延びる閉断面を構成している。 Further, on the lower surface of the floor panel 10, a pair of left and right floor frames 13 arranged on both sides of the center tunnel 11 in the vehicle width direction and extending in the vehicle front-rear direction are provided. The floor frame 13 and the floor panel 10 form a closed cross section extending in the front-rear direction of the vehicle.

サイドシル２０は、車幅方向の内側に位置するサイドシルインナ２１と、車幅方向の外側に位置するサイドシルアウタ（図示せず）とを有する。サイドシルインナ２１と、前記サイドシルアウタとが車幅方向に接合されて車両前後方向に延びており、車両方向前後方向に直交する断面における断面形状が矩形状の閉断面に構成されている。 The side sill 20 has a side sill inner 21 located inside in the vehicle width direction and a side sill outer (not shown) located outside in the vehicle width direction. The side sill inner 21 and the side sill outer are joined in the vehicle width direction and extend in the vehicle front-rear direction, and the cross-sectional shape in the cross section orthogonal to the vehicle front-rear direction is configured as a rectangular closed cross section.

フロアパネル１０の後部には、上方に立ち上がるキックアップ部１４を介して後方に延びるリヤフロアパネル３０が一体的に連設されている。また、リヤフロアパネル３０の車幅方向両側には、車両前後方向に延びる左右一対のリヤフレーム４０が設けられている。 A rear floor panel 30 extending rearward via a kick-up portion 14 rising upward is integrally connected to the rear portion of the floor panel 10. Further, a pair of left and right rear frames 40 extending in the front-rear direction of the vehicle are provided on both sides of the rear floor panel 30 in the vehicle width direction.

リヤフロアパネル３０は、前側に位置するリヤフロア前部３１と、リヤフロア前部３１に対して後側に位置するリヤフロア後部３２とを備える。リヤフロア前部３１には、下方に燃料タンク（図示せず）が取り付けられ、上方には、リヤシート（図示せず）が取り付けられるようになっている。また、リヤフロア前部３１は、その前端部において、前方に向かって下方に湾曲した形状を有している。リヤフロア後部３２は、主に荷室の底面を形成しており、車幅方向の中央部付近が下方に窪んでいる。 The rear floor panel 30 includes a rear floor front portion 31 located on the front side and a rear floor rear portion 32 located on the rear side with respect to the rear floor front portion 31. A fuel tank (not shown) is attached to the lower portion of the front portion 31 of the rear floor, and a rear seat (not shown) is attached to the upper portion. Further, the rear floor front portion 31 has a shape curved downward toward the front at the front end portion thereof. The rear portion 32 of the rear floor mainly forms the bottom surface of the luggage compartment, and the vicinity of the central portion in the vehicle width direction is recessed downward.

図４を参照すると、リヤフロア前部３１とリヤフロア後部３２とは、後方に向かって上方に段上げされた段上げ部３３を介して一体に連設されている。また、リヤフロアパネル３０は、この断面において、リヤフロア前部３１の前側に位置するリヤフロア先端部３４を備える。リヤフロア先端部３４とリヤフロア前部３１とは、リヤフロア先端部３４の後端から上方延びた縦壁部３５を介して一体に連設されている。リヤフロア先端部３４は、センタトンネル１１に接合されている。 Referring to FIG. 4, the rear floor front portion 31 and the rear floor rear portion 32 are integrally connected to each other via a step-up portion 33 that is stepped upward toward the rear. Further, the rear floor panel 30 includes a rear floor tip portion 34 located on the front side of the rear floor front portion 31 in this cross section. The rear floor tip portion 34 and the rear floor front portion 31 are integrally connected to each other via a vertical wall portion 35 extending upward from the rear end of the rear floor tip portion 34. The rear floor tip portion 34 is joined to the center tunnel 11.

図１及び図２を参照すると、リヤフレーム４０は、キックアップ部１４からリヤフロアパネル３０の後端まで前後方向に延びている。リヤフレーム４０は、前端がサイドシル２０の後部に連結されている。図５に示すように、リヤフレーム４０は、前後方向に直交する断面における断面形状が矩形状の閉断面に構成されている。 Referring to FIGS. 1 and 2, the rear frame 40 extends in the front-rear direction from the kick-up portion 14 to the rear end of the rear floor panel 30. The front end of the rear frame 40 is connected to the rear portion of the side sill 20. As shown in FIG. 5, the rear frame 40 is configured to have a closed cross section having a rectangular cross section in a cross section orthogonal to the front-rear direction.

また、リヤフレーム４０には、サスペンションのダンパ（図示せず）が取り付けられるダンパ支持部４１が設けられている。リヤフレーム４０には、ダンパ支持部４１を補強する補強フレーム４２が取り付けられている。 Further, the rear frame 40 is provided with a damper support portion 41 to which a suspension damper (not shown) is attached. A reinforcing frame 42 that reinforces the damper support portion 41 is attached to the rear frame 40.

リヤフロアパネル３０には、車幅方向に延びたリヤクロスメンバ５０と、リヤクロスメンバ５０の前方に間隔を開けて設けられ車幅方向に延びたクロスメンバ６０が接合されている。 The rear floor panel 30 is joined to a rear cross member 50 extending in the vehicle width direction and a cross member 60 provided in front of the rear cross member 50 at intervals and extending in the vehicle width direction.

リヤクロスメンバ５０は、車幅方向に延び、車幅方向の両側がリヤフレーム４０にそれぞれ接合されている。図４を参照すると、リヤクロスメンバ５０は、リヤフロアパネル３０の段上げ部３３に設けられている。リヤクロスメンバ５０は、段上げ部３３を上側から覆うリヤクロスメンバアッパ５１と、段上げ部３３を下側から覆うリヤクロスメンバロア５２とを有する。 The rear cross member 50 extends in the vehicle width direction, and both sides in the vehicle width direction are joined to the rear frame 40, respectively. Referring to FIG. 4, the rear cross member 50 is provided in the stepped-up portion 33 of the rear floor panel 30. The rear cross member 50 has a rear cross member upper 51 that covers the step-up portion 33 from above, and a rear cross member lower 52 that covers the step-up portion 33 from below.

リヤクロスメンバアッパ５１は、車幅方向に垂直な断面における断面形状が下方に開口したハット形断面に形成されており、リヤフロアパネル３０と共に車幅方向に延びる閉断面を構成している。 The rear cross member upper 51 is formed in a hat-shaped cross section having a cross section perpendicular to the vehicle width direction and opened downward, and constitutes a closed cross section extending in the vehicle width direction together with the rear floor panel 30.

リヤクロスメンバロア５２は、車幅方向に垂直な断面における断面形状が上方に開口したハット形断面に形成されており、リヤフロアパネル３０と共に車幅方向に延びる矩形状の閉断面を構成している。 The rear cross member lower 52 is formed in a hat-shaped cross section having a cross section perpendicular to the vehicle width direction and opened upward, and constitutes a rectangular closed cross section extending in the vehicle width direction together with the rear floor panel 30. ..

図１及び図２を参照すると、クロスメンバ６０は、リヤクロスメンバ５０の前方に設けられており、車幅方向に延びている。クロスメンバ６０の車幅方向の両端部は、左右一対のサイドシル２０にそれぞれ連結されている。図４を参照すると、クロスメンバ６０は、リヤフロアパネル３０の縦壁部３５に設けられている。 Referring to FIGS. 1 and 2, the cross member 60 is provided in front of the rear cross member 50 and extends in the vehicle width direction. Both ends of the cross member 60 in the vehicle width direction are connected to a pair of left and right side sills 20, respectively. Referring to FIG. 4, the cross member 60 is provided on the vertical wall portion 35 of the rear floor panel 30.

クロスメンバ６０は、リヤフロアパネル３０と共に車幅方向に延びる矩形状の閉断面を構成している。具体的には、クロスメンバ６０は、クロスメンバ６０の上面であるクロスメンバ上面部６１と、クロスメンバ上面部６１の前端から下方に延びるクロスメンバ前面部６２とを備える。また、クロスメンバ６０は、クロスメンバ上面部６１の後端から上方に延びたクロスメンバ後側フランジ部６３と、クロスメンバ前面部６２の下端かつ車幅方向中央の領域から前方に延びるクロスメンバ前側フランジ部６４とを備える。クロスメンバ前側フランジ部６４は、リヤフロアパネル３０のリヤフロア先端部３４の形状に沿うように構成されている（図６参照）。クロスメンバ６０は、クロスメンバ後側フランジ部６３でリヤフロアパネル３０の縦壁部３５に接合され、クロスメンバ前側フランジ部６４でリヤフロアパネル３０のリヤフロア先端部３４に接合されている。前述したように、リヤフロア先端部３４がセンタトンネル１１に接合されているため、クロスメンバ６０は、リヤフロアパネル３０を介してセンタトンネル１１に連結されている。 The cross member 60 and the rear floor panel 30 form a rectangular closed cross section extending in the vehicle width direction. Specifically, the cross member 60 includes a cross member upper surface portion 61 which is an upper surface of the cross member 60, and a cross member front surface portion 62 extending downward from the front end of the cross member upper surface portion 61. Further, the cross member 60 includes a cross member rear flange portion 63 extending upward from the rear end of the cross member upper surface portion 61, and a cross member front side extending forward from the lower end of the cross member front surface portion 62 and the central region in the vehicle width direction. A flange portion 64 is provided. The cross member front flange portion 64 is configured to follow the shape of the rear floor tip portion 34 of the rear floor panel 30 (see FIG. 6). The cross member 60 is joined to the vertical wall portion 35 of the rear floor panel 30 at the cross member rear flange portion 63, and is joined to the rear floor tip portion 34 of the rear floor panel 30 at the cross member front flange portion 64. As described above, since the rear floor tip portion 34 is joined to the center tunnel 11, the cross member 60 is connected to the center tunnel 11 via the rear floor panel 30.

また、図３を参照すると、クロスメンバ６０は、正面視において上側に凸状である。言い換えれば、クロスメンバ６０は、車幅方向の中央から車幅方向の外側に向かって下方に延びている。すなわち、クロスメンバ６０のクロスメンバ上面部６１は、車幅方向の中央から車幅方向の外側に向かって下方に傾斜している。これにより、クロスメンバ６０と後述する補強部材７０との接合位置と、クロスメンバ６０とサイドシル２０との連結位置とは上下方向にオフセットして配置されている。 Further, referring to FIG. 3, the cross member 60 is convex upward in the front view. In other words, the cross member 60 extends downward from the center in the vehicle width direction toward the outside in the vehicle width direction. That is, the cross member upper surface portion 61 of the cross member 60 is inclined downward from the center in the vehicle width direction toward the outside in the vehicle width direction. As a result, the joint position between the cross member 60 and the reinforcing member 70 described later and the connection position between the cross member 60 and the side sill 20 are offset in the vertical direction.

また、図１及び図２を参照すると、リヤフロアパネル３０には、車両前後方向に延びてリヤクロスメンバ５０とクロスメンバ６０とを連結する車幅方向に一対の補強部材７０が接合されている。補強部材７０の補強部材後端部７０ａは、リヤクロスメンバ５０の前面に連結されており、補強部材７０の補強部材先端部７０ｂは、クロスメンバ６０のクロスメンバ上面部６１に接合されている。補強部材７０の補強部材先端部７０ｂは、クロスメンバ６０のクロスメンバ上面部６１のうち、車幅方向の中央部に接合されている。また、補強部材７０は、センタトンネル１１よりも上方に配置されている（図３参照）。言い換えれば、センタトンネル１１は、補強部材７０よりも下方に配置されている。 Further, referring to FIGS. 1 and 2, a pair of reinforcing members 70 are joined to the rear floor panel 30 in the vehicle width direction extending in the front-rear direction of the vehicle and connecting the rear cross member 50 and the cross member 60. The reinforcing member rear end portion 70a of the reinforcing member 70 is connected to the front surface of the rear cross member 50, and the reinforcing member tip portion 70b of the reinforcing member 70 is joined to the cross member upper surface portion 61 of the cross member 60. The reinforcing member tip portion 70b of the reinforcing member 70 is joined to the central portion of the cross member upper surface portion 61 of the cross member 60 in the vehicle width direction. Further, the reinforcing member 70 is arranged above the center tunnel 11 (see FIG. 3). In other words, the center tunnel 11 is arranged below the reinforcing member 70.

また、図１に示すように、補強部材７０は、リヤフロアパネル３０の形状に沿って形成されている。補強部材７０の補強部材先端部７０ｂは、リヤフロア前部３１の縦壁部３５（図４に示す）に沿って前方に向かって下方に湾曲している。図２を併せて参照すると、補強部材７０の補強部材先端部７０ｂは、前方に向かって車幅方向に拡幅している。 Further, as shown in FIG. 1, the reinforcing member 70 is formed along the shape of the rear floor panel 30. The reinforcing member tip portion 70b of the reinforcing member 70 is curved downward toward the front along the vertical wall portion 35 (shown in FIG. 4) of the rear floor front portion 31. With reference to FIG. 2, the reinforcing member tip portion 70b of the reinforcing member 70 is widened in the vehicle width direction toward the front.

図５を参照すると、補強部材７０は、車両前後方向に垂直な断面における断面形状が下方に開口したハット形断面に形成されている。補強部材７０は、リヤフロアパネル３０と共に車両前後方向に延びる閉断面を構成している。前述したように、補強部材７０の補強部材先端部７０ｂが、前方に向かって車幅方向の外側に拡幅しているため、補強部材７０は、補強部材先端部７０ｂにおいて、リヤフロアパネル３０と共に構成する閉断面の断面積が前方に向かって大きくなっている。また、補強部材７０は、車両前後方向に渡って車両前後方向に垂直な断面における断面形状が連続している。 Referring to FIG. 5, the reinforcing member 70 is formed in a hat-shaped cross section in which the cross-sectional shape in the cross section perpendicular to the vehicle front-rear direction is open downward. The reinforcing member 70 constitutes a closed cross section extending in the front-rear direction of the vehicle together with the rear floor panel 30. As described above, since the reinforcing member tip 70b of the reinforcing member 70 widens outward in the vehicle width direction toward the front, the reinforcing member 70 is configured together with the rear floor panel 30 at the reinforcing member tip 70b. The cross-sectional area of the closed cross section increases toward the front. Further, the reinforcing member 70 has a continuous cross-sectional shape in a cross section perpendicular to the vehicle front-rear direction over the vehicle front-rear direction.

補強部材７０は、補強部材上壁部７１と、補強部材上壁部７１の車幅方向内側の端部から下方に延びた補強部材内側壁部７２と、補強部材上壁部７１の車幅方向外側から下方に延びた補強部材外側壁部７３とを備える。 The reinforcing member 70 includes the reinforcing member upper wall portion 71, the reinforcing member inner side wall portion 72 extending downward from the inner end portion of the reinforcing member upper wall portion 71 in the vehicle width direction, and the reinforcing member upper wall portion 71 in the vehicle width direction. A reinforcing member outer wall portion 73 extending downward from the outside is provided.

また、図２に示すように、補強部材７０は、平面視においてリヤフロアパネル３０と重複する部分に設けられた補強部材本体フランジ部７４と、平面視においてクロスメンバ６０と重複する部分に設けられた補強部材前側フランジ部７５とを備える。 Further, as shown in FIG. 2, the reinforcing member 70 is provided at a portion overlapping the rear floor panel 30 in a plan view and a portion overlapping the cross member 60 in a plan view. A flange portion 75 on the front side of the reinforcing member is provided.

補強部材７０の補強部材本体フランジ部７４は、補強部材内側壁部７２の下端、補強部材外側壁部７３の下端、及び補強部材上壁部７１の後端から補強部材７０の外側に向かって延びる板状である。補強部材７０の補強部材本体フランジ部７４は、リヤフロアパネル３０及びリヤクロスメンバ５０の前面に沿うように構成されている。補強部材７０は、補強部材本体フランジ部７４においてリヤクロスメンバ５０の前面とリヤフロアパネル３０とに接合されている。 The reinforcing member main body flange portion 74 of the reinforcing member 70 extends from the lower end of the reinforcing member inner side wall portion 72, the lower end of the reinforcing member outer wall portion 73, and the rear end of the reinforcing member upper wall portion 71 toward the outside of the reinforcing member 70. It is plate-shaped. The reinforcing member main body flange portion 74 of the reinforcing member 70 is configured to be along the front surface of the rear floor panel 30 and the rear cross member 50. The reinforcing member 70 is joined to the front surface of the rear cross member 50 and the rear floor panel 30 at the flange portion 74 of the reinforcing member main body.

図６を参照すると、補強部材前側フランジ部７５は、補強部材内側壁部７２の下端から車幅方向の内側に向かって延びる内側フランジ７５ａと、補強部材外側壁部７３の下端から車幅方向の外側に向かって延びる外側フランジ７５ｂとを備える。補強部材前側フランジ部７５は、クロスメンバ６０のクロスメンバ上面部６１に沿うように構成されている。補強部材７０は、補強部材前側フランジ部７５でクロスメンバ６０のクロスメンバ上面部６１と上下方向に接合されている。具体的には、内側フランジ７５ａと、後述する連結部材８０の連結部材後側フランジ部８４と、クロスメンバ６０のクロスメンバ上面部６１とが３枚重ねで上下方向にスポット溶接されている。外側フランジ７５ｂと、クロスメンバ６０のクロスメンバ上面部６１とが２枚重ねで上下方向にスポット溶接されている。 Referring to FIG. 6, the reinforcing member front flange portion 75 has an inner flange 75a extending inward in the vehicle width direction from the lower end of the reinforcing member inner side wall portion 72 and a vehicle width direction from the lower end of the reinforcing member outer wall portion 73. It is provided with an outer flange 75b extending outward. The reinforcing member front flange portion 75 is configured to follow the cross member upper surface portion 61 of the cross member 60. The reinforcing member 70 is joined to the cross member upper surface portion 61 of the cross member 60 in the vertical direction by the flange portion 75 on the front side of the reinforcing member. Specifically, the inner flange 75a, the connecting member rear flange portion 84 of the connecting member 80, which will be described later, and the cross member upper surface portion 61 of the cross member 60 are spot-welded in three layers in the vertical direction. The outer flange 75b and the cross member upper surface portion 61 of the cross member 60 are spot-welded in the vertical direction by stacking two sheets.

図１を参照すると、本実施形態の車両の車体１は、クロスメンバ６０とセンタトンネル１１とを連結する連結部材８０を備える。連結部材８０は、クロスメンバ６０とセンタトンネル１１との間を筋交い状に連結するように構成されている。 Referring to FIG. 1, the vehicle body 1 of the present embodiment includes a connecting member 80 that connects the cross member 60 and the center tunnel 11. The connecting member 80 is configured to connect the cross member 60 and the center tunnel 11 in a brace shape.

図３を参照すると、本実実施形態の連結部材８０は、車幅方向に垂直な断面における断面形状が下方に開口したハット形断面に形成されている。具体的には、連結部材８０は、前方に向けて下方に傾斜して延びる連結部材上面部８１と、連結部材上面部８１の車幅方向の両端部から車幅方向の外側に向けて下方に傾斜して延びる一対の連結部材側面部８２とを備える。また、図６を参照すると、連結部材８０は、センタトンネル１１、トンネル補強部材１２、リヤフロアパネル３０のリヤフロア先端部３４、及びクロスメンバ６０のクロスメンバ前側フランジ部６４と共に車両前後方向に延びる閉断面を構成している。 Referring to FIG. 3, the connecting member 80 of the present embodiment is formed in a hat-shaped cross section having a cross-sectional shape perpendicular to the vehicle width direction and opening downward. Specifically, the connecting member 80 has a connecting member upper surface portion 81 extending downward and inclined toward the front, and both ends of the connecting member upper surface portion 81 in the vehicle width direction downward toward the outside in the vehicle width direction. A pair of connecting member side surface portions 82 extending at an angle are provided. Further, referring to FIG. 6, the connecting member 80 has a closed cross section extending in the vehicle front-rear direction together with the center tunnel 11, the tunnel reinforcing member 12, the rear floor tip portion 34 of the rear floor panel 30, and the cross member front flange portion 64 of the cross member 60. Consists of.

また、連結部材８０は、連結部材８０の前側に設けられた連結部材前側フランジ部８３と、連結部材８０の後側に設けられた連結部材後側フランジ部８４とを備える。 Further, the connecting member 80 includes a connecting member front flange portion 83 provided on the front side of the connecting member 80, and a connecting member rear flange portion 84 provided on the rear side of the connecting member 80.

連結部材前側フランジ部８３は、連結部材側面部８２のそれぞれの下端から車幅方向の外側に延びている板状である。連結部材前側フランジ部８３は、センタトンネル１１とトンネル補強部材１２とともに３枚重ねで上下方向にスポット溶接されている。 The flange portion 83 on the front side of the connecting member has a plate shape extending outward in the vehicle width direction from the lower ends of the side flange portions 82 of the connecting member. The flange portion 83 on the front side of the connecting member is spot-welded in the vertical direction together with the center tunnel 11 and the tunnel reinforcing member 12 in three layers.

連結部材後側フランジ部８４は、クロスメンバ６０のクロスメンバ前側フランジ部６４に沿って延びる第１フランジ８４ａと、クロスメンバ６０のクロスメンバ前面部６２に沿って延びる第２フランジ８４ｂと、クロスメンバ６０のクロスメンバ上面部６１に沿って延びる第３フランジ８４ｃとを備える。 The connecting member rear flange portion 84 includes a first flange 84a extending along the cross member front flange portion 64 of the cross member 60, a second flange 84b extending along the cross member front surface portion 62 of the cross member 60, and a cross member. It is provided with a third flange 84c extending along the cross member upper surface portion 61 of the 60.

第１フランジ８４ａは、クロスメンバ６０のクロスメンバ前側フランジ部６４に沿うように、連結部材側面部８２の下端から車幅方向の外側に向かって延びている。第１フランジ８４ａは、リヤフロア先端部３４とともにクロスメンバ６０のクロスメンバ前側フランジ部６４を挟むように配置された状態で、３枚重ねで上下方向にスポット溶接されている。 The first flange 84a extends from the lower end of the side surface portion 82 of the connecting member toward the outside in the vehicle width direction along the cross member front flange portion 64 of the cross member 60. The first flange 84a is spot-welded in the vertical direction by stacking three sheets in a state where the first flange 84a is arranged so as to sandwich the cross member front flange portion 64 of the cross member 60 together with the rear floor tip portion 34.

第２フランジ８４ｂは、連結部材上面部８１の上端及び一対の連結部材側面部８２の後端から連結部材８０の外側に向かって延びている。第２フランジ８４ｂは、第１フランジ８４ａの後端から上方に立ち上がるように、第１フランジ８４ａに連設されている。第２フランジ８４ｂは、クロスメンバ６０のクロスメンバ前面部６２に車両前後方向にスポット溶接されている。 The second flange 84b extends from the upper end of the upper surface portion 81 of the connecting member and the rear end of the pair of side surface portions 82 of the connecting member toward the outside of the connecting member 80. The second flange 84b is connected to the first flange 84a so as to rise upward from the rear end of the first flange 84a. The second flange 84b is spot welded to the cross member front surface portion 62 of the cross member 60 in the front-rear direction of the vehicle.

第３フランジ８４ｃは、第２フランジ８４ｂの上端から後方に向かって延びるように、第２フランジ８４ｂに連設されている。前述したように、第３フランジ８４ｃは、クロスメンバ６０のクロスメンバ上面部６１と補強部材７０の内側フランジ７５ａとの間に挟まれた状態で、３枚重ねで上下方向にスポット溶接される。これにより、クロスメンバ６０と、補強部材７０と、連結部材８０とは、共に接合されている。 The third flange 84c is connected to the second flange 84b so as to extend rearward from the upper end of the second flange 84b. As described above, the third flange 84c is spot-welded in three layers in the vertical direction while being sandwiched between the cross member upper surface portion 61 of the cross member 60 and the inner flange 75a of the reinforcing member 70. As a result, the cross member 60, the reinforcing member 70, and the connecting member 80 are joined together.

本実施形態によれば、後突時に、後突荷重をリヤフレーム４０から、リヤクロスメンバ５０、補強部材７０、及びクロスメンバ６０を介して、センタトンネル１１に伝達するロードパスが形成されている。また、補強部材７０がクロスメンバ６０のクロスメンバ上面部６１に上下方向に接合されているので、補強部材７０とクロスメンバ６０との接合部には、補強部材７０に入力された車両前後方向の後突荷重が接合方向に対する剪断方向の荷重として伝達される。すなわち、補強部材７０とクロスメンバ６０との間に引張・圧縮方向に荷重が入力されにくいので、補強部材７０とクロスメンバ６０とが剥離することが抑制される。このため、補強部材７０とセンタトンネル１１とが上下方向にオフセットして配置されている場合であっても、後突時の後突荷重を補強部材７０からセンタトンネル１１へと効率よく伝達できる。 According to the present embodiment, a load path is formed in which the rear collision load is transmitted from the rear frame 40 to the center tunnel 11 via the rear cross member 50, the reinforcing member 70, and the cross member 60 at the time of rear collision. .. Further, since the reinforcing member 70 is joined to the cross member upper surface portion 61 of the cross member 60 in the vertical direction, the joint portion between the reinforcing member 70 and the cross member 60 is joined to the joint portion in the vehicle front-rear direction input to the reinforcing member 70. The back collision load is transmitted as a load in the shear direction with respect to the joining direction. That is, since it is difficult for a load to be input between the reinforcing member 70 and the cross member 60 in the tensile / compressive direction, it is possible to prevent the reinforcing member 70 and the cross member 60 from peeling off. Therefore, even when the reinforcing member 70 and the center tunnel 11 are arranged so as to be offset in the vertical direction, the rear collision load at the time of the rear collision can be efficiently transmitted from the reinforcing member 70 to the center tunnel 11.

補強部材７０は、クロスメンバ６０のクロスメンバ上面部６１に沿って延びる補強部材前側フランジ部７５においてクロスメンバ６０のクロスメンバ上面部６１に上下方向に接合されているので、本発明を好適に実施できる。 Since the reinforcing member 70 is vertically joined to the cross member upper surface portion 61 of the cross member 60 at the reinforcing member front flange portion 75 extending along the cross member upper surface portion 61 of the cross member 60, the present invention is suitably carried out. can.

クロスメンバ６０と補強部材７０との接合位置と、クロスメンバ６０とサイドシル２０との連結位置とが上下方向にオフセットして配置されているため、車両の後突時に車両前後方向に延びる補強部材７０からクロスメンバ６０に車両前後方向の後突荷重が伝達された場合には、クロスメンバ６０がサイドシル２０に連結された両端部を中心として前方へ倒れ易くなる（図１中符号Ｒ参照）。このため、車両の後突時の車両前後方向の後突荷重がクロスメンバ６０に伝達した場合であっても、クロスメンバ６０の潰れ変形が抑制され、後突荷重をセンタトンネル１１に効率よく伝達できる。 Since the joint position between the cross member 60 and the reinforcing member 70 and the connecting position between the cross member 60 and the side sill 20 are arranged so as to be offset in the vertical direction, the reinforcing member 70 extends in the front-rear direction of the vehicle when the vehicle collides backward. When the rear collision load in the vehicle front-rear direction is transmitted from the cross member 60 to the cross member 60, the cross member 60 tends to fall forward around both ends connected to the side sill 20 (see reference numeral R in FIG. 1). Therefore, even when the rear collision load in the vehicle front-rear direction at the time of the rear collision of the vehicle is transmitted to the cross member 60, the crushing deformation of the cross member 60 is suppressed and the rear collision load is efficiently transmitted to the center tunnel 11. can.

また、センタトンネル１１は、ダッシュパネル（図示せず）のような車両前方に配置される他の構成要素と連結されているため、車両の後突時の後突荷重を車両前方へと確実に伝達できる。 Further, since the center tunnel 11 is connected to other components arranged in front of the vehicle such as a dash panel (not shown), the rear collision load at the time of rear collision of the vehicle is surely applied to the front of the vehicle. Can be communicated.

補強部材７０が車両前後方向に交差する断面において、閉断面を形成しているため、補強部材７０の車両前後方向の強度が向上する。このため、車両の後突時の後突荷重によって補強部材７０が車両前後方向に変形することを抑制でき、車両の後突時の後突荷重を車両前方へ効果的に伝達できる。 Since the reinforcing member 70 forms a closed cross section in the cross section where the reinforcing member 70 intersects in the vehicle front-rear direction, the strength of the reinforcing member 70 in the vehicle front-rear direction is improved. Therefore, it is possible to suppress the reinforcing member 70 from being deformed in the front-rear direction of the vehicle due to the rear collision load at the time of the rear collision of the vehicle, and it is possible to effectively transmit the rear collision load at the time of the rear collision of the vehicle to the front of the vehicle.

補強部材７０の補強部材先端部７０ｂが前方に向かって下方に湾曲しているので、補強部材７０とセンタトンネル１１との間の高低差の差を吸収できる。また、補強部材先端部７０ｂが前方に向かって車幅方向に拡幅していることで、補強部材７０が形成する閉断面の断面積が車両前方に向かって増加するので、補強部材７０の剛性が向上する。これにより、後突時に補強部材７０が補強部材先端部７０ｂで変形することを抑制しつつ、補強部材７０とセンタトンネル１１との間の高低差を吸収できる。 Since the reinforcing member tip 70b of the reinforcing member 70 is curved downward toward the front, the difference in height between the reinforcing member 70 and the center tunnel 11 can be absorbed. Further, since the reinforcing member tip portion 70b widens toward the front in the vehicle width direction, the cross-sectional area of the closed cross section formed by the reinforcing member 70 increases toward the front of the vehicle, so that the rigidity of the reinforcing member 70 increases. improves. As a result, it is possible to absorb the height difference between the reinforcing member 70 and the center tunnel 11 while suppressing the reinforcing member 70 from being deformed by the reinforcing member tip portion 70b at the time of rear collision.

連結部材８０によって、車両の後突時にクロスメンバ６０に伝達される車両前後方向の後突荷重が支持されるとともに、後突荷重がセンタトンネル１１に伝達されるので、車両の後突時の後突荷重を車両前方へ効果的に伝達できる。 The connecting member 80 supports the rear collision load in the vehicle front-rear direction transmitted to the cross member 60 at the time of the rear collision of the vehicle, and the rear collision load is transmitted to the center tunnel 11. The thrust load can be effectively transmitted to the front of the vehicle.

補強部材７０は、クロスメンバ６０に加えて連結部材８０と接合されているため、後突荷重が補強部材７０からクロスメンバ６０と連結部材８０とに分散されてセンタトンネル１１に伝達されるので、後突荷重を車両前方へ効果的に伝達できる。 Since the reinforcing member 70 is joined to the connecting member 80 in addition to the cross member 60, the rear collision load is distributed from the reinforcing member 70 to the cross member 60 and the connecting member 80 and transmitted to the center tunnel 11. The rear collision load can be effectively transmitted to the front of the vehicle.

また、連結部材８０とセンタトンネル１１とが上下方向にスポット溶接されているので、連結部材８０とセンタトンネル１１との間の接合部には、連結部材８０に入力された車両前後方向の後突荷重が接合方向に対する剪断方向の荷重として伝達される。すなわち、連結部材８０とセンタトンネル１１との間に引張・圧縮方向に荷重が入力されにくいので、連結部材８０とセンタトンネル１１とが剥離することを抑制できる。このため、後突時の後突荷重を連結部材８０からセンタトンネル１１へと効率よく伝達できる。 Further, since the connecting member 80 and the center tunnel 11 are spot welded in the vertical direction, the joint portion between the connecting member 80 and the center tunnel 11 has a rear collision in the vehicle front-rear direction input to the connecting member 80. The load is transmitted as a load in the shear direction with respect to the joining direction. That is, since it is difficult for a load to be input between the connecting member 80 and the center tunnel 11 in the tension / compression direction, it is possible to prevent the connecting member 80 and the center tunnel 11 from peeling off. Therefore, the rear collision load at the time of rear collision can be efficiently transmitted from the connecting member 80 to the center tunnel 11.

以上、上述の実施形態を挙げて本発明を説明したが、本発明は上述の実施形態に限定されるものではない。 Although the present invention has been described above with reference to the above-described embodiments, the present invention is not limited to the above-mentioned embodiments.

例えば、本実施形態では、構造体の一例としてセンタトンネル１１を挙げて説明したが、構造体は、センタトンネル１１に限定されず、フロアフレーム１３のような車両前後方向に延びる他の構造体であってもよい。 For example, in the present embodiment, the center tunnel 11 has been described as an example of the structure, but the structure is not limited to the center tunnel 11, but may be another structure extending in the vehicle front-rear direction such as the floor frame 13. There may be.

また、補強部材７０は、本実施形態では２つであったが、補強部材７０の数はこれに限定されず、１つ又は３つ以上であってもよい。 Further, although the number of the reinforcing members 70 is two in the present embodiment, the number of the reinforcing members 70 is not limited to this, and may be one or three or more.

１車体
１０フロアパネル
１１センタトンネル
１２トンネル補強部材
１３フロアフレーム
１４キックアップ部
２０サイドシル
２１サイドシルインナ
３０リヤフロアパネル
３１リヤフロア前部
３２リヤフロア後部
３３段上げ部
３４リヤフロア先端部
３５縦壁部
４０リヤフレーム
４１ダンパ支持部
４２補強フレーム
５０リヤクロスメンバ
５１リヤクロスメンバアッパ
５２リヤクロスメンバロア
６０クロスメンバ
６１クロスメンバ上面部
６２クロスメンバ前面部
６３クロスメンバ後側フランジ部
６４クロスメンバ前側フランジ部
７０補強部材
７０ａ補強部材後端部
７０ｂ補強部材先端部
７１補強部材上壁部
７２補強部材内側壁部
７３補強部材外側壁部
７４補強部材本体フランジ部
７５補強部材前側フランジ部
７５ａ内側フランジ
７５ｂ外側フランジ
８０連結部材
８１連結部材上面部
８２連結部材側面部
８３連結部材前側フランジ部
８４連結部材後側フランジ部
８４ａ第１フランジ
８４ｂ第２フランジ
８４ｃ第３フランジ 1 Body 10 Floor panel 11 Center tunnel 12 Tunnel reinforcement member 13 Floor frame 14 Kick-up part 20 Side sill 21 Side sill inner 30 Rear floor panel 31 Rear floor front part 32 Rear floor rear part 33 Step-up part 34 Rear floor tip part 35 Vertical wall part 40 Rear frame 41 Damper support 42 Reinforcing frame 50 Rear cross member 51 Rear cross member upper 52 Rear cross member lower 60 Cross member 61 Cross member upper surface 62 Cross member front 63 Cross member rear flange 64 Cross member front flange 70 Reinforcing member 70a Reinforcing member rear end 70b Reinforcing member tip 71 Reinforcing member upper wall 72 Reinforcing member inner side wall 73 Reinforcing member outer wall 74 Reinforcing member main body flange 75 Reinforcing member front flange 75a Inner flange 75b Outer flange 80 Connecting member 81 Connecting member upper surface 82 Connecting member side surface 83 Connecting member front flange 84 Connecting member rear flange 84a 1st flange 84b 2nd flange 84c 3rd flange

Claims

A pair of rear frames extending in the vehicle width direction extending in the front-rear direction of the vehicle,
A rear cross member that extends in the vehicle width direction and has both ends in the vehicle width direction joined to the pair of rear frames.
A cross member provided in front of the rear cross member and extending in the vehicle width direction,
A reinforcing member that extends in the front-rear direction of the vehicle and connects the rear cross member and the cross member,
It is provided with a structure that is located below the reinforcing member and extends forward from the cross member.
The reinforcing member is vertically joined to the upper surface of the cross member at the tip of the reinforcing member .
The reinforcing member forms a closed cross section in a cross section that intersects in the front-rear direction of the vehicle.
The reinforcing member is a rear body structure of a vehicle in which the front portion of the reinforcing member is curved downward toward the front and widens toward the front in the vehicle width direction .

The reinforcing member is provided on the front portion of the reinforcing member and includes a flange portion on the front side of the reinforcing member extending along the upper surface of the cross member.
The rear body structure of a vehicle according to claim 1, wherein the reinforcing member is vertically joined to the upper surface of the cross member at the front flange portion of the reinforcing member.

A pair of side sills extending in the front-rear direction of the vehicle and having both ends of the cross member connected in the vehicle width direction are provided.
The cross member is inclined downward from the central portion in the vehicle width direction toward the outside in the vehicle width direction.
The rear body structure of a vehicle according to claim 1 or 2, wherein the reinforcing member is joined to the central portion of the cross member in the vehicle width direction.

The rear body structure of a vehicle according to any one of claims 1 to 3, wherein the structure is a center tunnel extending in the front-rear direction of the vehicle.

The rear body structure of a vehicle according to any one of claims 1 to 4 , further comprising a connecting member extending in the front-rear direction of the vehicle and connecting the cross member and the structure.

The rear body structure of a vehicle according to claim 5 , wherein the reinforcing member, the cross member, and the connecting member are joined together.

A pair of rear frames extending in the vehicle width direction extending in the front-rear direction of the vehicle,
A rear cross member that extends in the vehicle width direction and has both ends in the vehicle width direction joined to the pair of rear frames.
A cross member provided in front of the rear cross member and extending in the vehicle width direction,
A reinforcing member that extends in the front-rear direction of the vehicle and connects the rear cross member and the cross member,
With a structure arranged below the reinforcing member and extending forward from the cross member
Equipped with
The reinforcing member is vertically joined to the upper surface of the cross member at the tip of the reinforcing member.
A connecting member that extends in the front-rear direction of the vehicle and connects the cross member and the structure is provided.
A rear body structure of a vehicle in which the reinforcing member, the cross member, and the connecting member are joined together.