JP2009012643A - Vehicle body rear part structure - Google Patents

Vehicle body rear part structure Download PDF

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JP2009012643A
JP2009012643A JP2007177445A JP2007177445A JP2009012643A JP 2009012643 A JP2009012643 A JP 2009012643A JP 2007177445 A JP2007177445 A JP 2007177445A JP 2007177445 A JP2007177445 A JP 2007177445A JP 2009012643 A JP2009012643 A JP 2009012643A
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width direction
vehicle width
vehicle body
rear side
vehicle
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JP5003319B2 (en
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Junji Okahara
淳次 岡原
Arata Mikami
新 三神
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Toyota Motor Corp
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Toyota Motor Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To suppress buckling of a rear side member at rear-end collision of a vehicle while suppressing increase of the number of parts and weight. <P>SOLUTION: In the vehicle body rear part structure, on an intermediate part in a longitudinal direction of the rear side member 18, a folded/bent part 19 is formed at a position opposed to a rear tire, and the intermediate part in the longitudinal direction of the rear side member 18 is projected to an inner side of the vehicle width. Here, on a side wall 18A of the rear side member 18, an inclination part 22 is provided at an inner side in the vehicle width direction of the folded/bent part 19, and an inner side in the vehicle width direction of the folded/bent part 19 is twisted so as to contract an area of a closed cross section 20 of the rear side member 18 and the rear floor panel 12. Therefore, on the folded/bent part 19, a curvature of a center S1 of the closed cross section 20 becomes smaller than a curvature of the folded/bent part 19 itself. Further, to an inner side surface (inclination wall 22) in the vehicle width direction on the folded/bent part 19, a rear suspension member 24 is connected through a body mount 26. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、車体後部構造に関する。   The present invention relates to a vehicle body rear structure.

従来、車体の後部構造（例えば、特許文献１参照）では、一対のリヤサイドフレーム（リヤサイドメンバ）の間にテンションバーを掛け渡すことによって、車両の後面衝突時における一対のリヤサイドメンバの座屈を抑制するようにしている。
特開２００１−１５１１４４号公報 Conventionally, in a rear structure of a vehicle body (for example, see Patent Document 1), a buckling of a pair of rear side members at the time of a vehicle rear collision is suppressed by spanning a tension bar between a pair of rear side frames (rear side members). Like to do.
JP 2001-151144 A

しかしながら、上述の車体後部構造では、テンションバーが追加される構成であるため、部品点数及び重量が増加する。   However, in the above-described vehicle body rear structure, since the tension bar is added, the number of parts and the weight increase.

本発明は上記事実を考慮し、部品点数及び重量の増加を抑制しつつ、車両の後面衝突時におけるリヤサイドメンバの座屈を抑制することができる車体後部構造を得ることが目的である。   In view of the above facts, an object of the present invention is to obtain a vehicle body rear structure that can suppress buckling of a rear side member at the time of a rear collision of a vehicle while suppressing an increase in the number of parts and weight.

請求項１に記載の発明に係る車体後部構造は、車体後部の車幅方向側部に車体前後方向を長手方向として配置され、長手方向中間部が車幅方向内側へ突出するように曲ると共に、閉断面を構成し、前記閉断面の図心が前記曲り部において前記閉断面の車幅方向中央部よりも車幅方向外側に配置されたリヤサイドメンバを有することを特徴としている。   The vehicle body rear portion structure according to the first aspect of the present invention is disposed at the vehicle width direction side portion of the vehicle body rear portion with the vehicle body front-rear direction as the longitudinal direction, and is bent so that the middle portion in the longitudinal direction protrudes inward in the vehicle width direction. A closed cross section is formed, and the centroid of the closed cross section has a rear side member that is disposed on the bent portion at the outer side in the vehicle width direction than the central portion in the vehicle width direction of the closed cross section.

請求項１に記載の車体後部構造では、リヤサイドメンバが構成する閉断面の図心が、リヤサイドメンバの曲り部において前記閉断面の車幅方向中央部よりも車幅方向外側に配置されている。このため、リヤサイドメンバの曲り部における前記閉断面の図心の曲率が、曲り部自体の曲率よりも小さくなっている。これにより、車両の後面衝突時にリヤサイドメンバに生じる曲げモーメントを小さくすることができるので、部品点数及び重量の増加を抑制しつつ、車両の後面衝突時におけるリヤサイドメンバの座屈を抑制することができる。   In the rear structure of the vehicle body according to the first aspect, the centroid of the closed cross section formed by the rear side member is disposed outside the vehicle width direction center of the closed cross section at the bent portion of the rear side member. For this reason, the curvature of the centroid of the closed cross section at the bent portion of the rear side member is smaller than the curvature of the bent portion itself. As a result, the bending moment generated in the rear side member at the time of the rear collision of the vehicle can be reduced, so that buckling of the rear side member at the time of the rear collision of the vehicle can be suppressed while suppressing an increase in the number of parts and weight. .

請求項２に記載の発明に係る車体後部構造は、車体後部の車幅方向側部に車体前後方向を長手方向として配置され、長手方向中間部が車幅方向内側へ突出するように曲ると共に、閉断面を構成し、前記曲り部の車幅方向内側が前記閉断面の面積を縮小させるように抉れたリヤサイドメンバを有することを特徴としている。   The vehicle body rear portion structure according to the second aspect of the invention is arranged at the vehicle width direction side portion of the vehicle body rear portion with the vehicle body front-rear direction as the longitudinal direction, and is bent so that the middle portion in the longitudinal direction protrudes inward in the vehicle width direction. Further, the present invention is characterized in that a closed cross section is configured, and a rear side member that is curled so as to reduce the area of the closed cross section is provided on the inner side in the vehicle width direction of the bent portion.

請求項２に記載の車体後部構造では、リヤサイドメンバの曲り部の車幅方向内側が、リヤサイドメンバによって構成される閉断面の面積を縮小させるように抉れている。このため、リヤサイドメンバの曲り部において、前記閉断面の図心は、上記抉れ部が省略されている場合よりも車幅方向外側に配置されており、前記閉断面の図心の曲率が、曲り部自体の曲率よりも小さくなっている。これにより、車両の後面衝突時にリヤサイドメンバに生じる曲げモーメントを小さくすることができるので、部品点数及び重量の増加を抑制しつつ、車両の後面衝突時におけるリヤサイドメンバの座屈を抑制することができる。   In the vehicle body rear part structure according to the second aspect, the inner side in the vehicle width direction of the bent portion of the rear side member is bent so as to reduce the area of the closed cross section constituted by the rear side member. For this reason, in the bent portion of the rear side member, the centroid of the closed cross section is arranged on the outer side in the vehicle width direction than the case where the bent portion is omitted, and the curvature of the centroid of the closed cross section is It is smaller than the curvature of the bent part itself. As a result, the bending moment generated in the rear side member at the time of the rear collision of the vehicle can be reduced, so that buckling of the rear side member at the time of the rear collision of the vehicle can be suppressed while suppressing an increase in the number of parts and weight. .

請求項３に記載の発明に係る車体後部構造は、車体後部の車幅方向両側部に車体前後方向を長手方向として配置され、長手方向中間部が車幅方向内側へ突出するように曲がった左右一対のリヤサイドメンバと、前記一対のリヤサイドメンバの前記曲り部における車幅方向内側面に連結されて両者の間に掛け渡されたリヤサスペンションメンバと、を有することを特徴としている。   The rear structure of the vehicle body according to the invention described in claim 3 is disposed on both sides of the rear portion of the vehicle body in the vehicle width direction with the vehicle body front-rear direction as the longitudinal direction, and is bent left and right so that the middle portion in the longitudinal direction protrudes inward in the vehicle width direction A pair of rear side members, and a rear suspension member connected to an inner side surface in the vehicle width direction at the bent portion of the pair of rear side members and spanned between the two.

請求項３に記載の車体後部構造では、リヤサスペンションメンバが一対のリヤサイドメンバの曲り部における車幅方向内側面に連結されて一対のリヤサイドメンバ間に掛け渡されている。このため、リヤサイドメンバの曲り部が車体後方側からの荷重によって車幅方向内側へ撓むことを、リヤサスペンションメンバによって抑えることができる。したがって、部品点数及び重量の増加を抑制しつつ、車両の後面衝突時におけるリヤサイドメンバの座屈を抑制することができる。   In the rear structure of the vehicle body according to the third aspect, the rear suspension member is connected to the inner side surface in the vehicle width direction at the bent portion of the pair of rear side members and is spanned between the pair of rear side members. Therefore, the rear suspension member can prevent the bent portion of the rear side member from bending inward in the vehicle width direction due to the load from the rear side of the vehicle body. Accordingly, it is possible to suppress buckling of the rear side member at the time of a rear collision of the vehicle while suppressing an increase in the number of parts and weight.

請求項４に記載の発明に係る車体後部構造は、車体後部の車幅方向両側部に車体前後方向を長手方向として配置され、長手方向中間部が車幅方向内側へ突出するように曲ると共に、閉断面を構成し、前記曲り部の車幅方向内側が前記閉断面の面積を縮小させるように抉れた左右一対のリヤサイドメンバと、前記一対のリヤサイドメンバの前記抉れ部に連結されて両者の間に掛け渡されたリヤサスペンションメンバと、を有することを特徴としている。   The vehicle body rear portion structure according to the invention described in claim 4 is disposed on both sides of the rear portion of the vehicle body in the vehicle width direction with the vehicle body front-rear direction as the longitudinal direction, and is bent so that the middle portion in the longitudinal direction protrudes inward in the vehicle width direction. An inner side in the vehicle width direction of the bent portion is connected to a pair of left and right rear side members bent so as to reduce an area of the closed cross section, and the bent portions of the pair of rear side members And a rear suspension member suspended between the two.

請求項４に記載の車体後部構造では、リヤサイドメンバの曲り部の車幅方向内側が、リヤサイドメンバによって構成される閉断面の面積を縮小させるように抉れている。このため、リヤサイドメンバの曲り部において、前記閉断面の図心は、上記抉れ部が省略されている場合よりも車幅方向外側に配置されており、前記閉断面の図心の曲率が、曲り部自体の曲率よりも小さくなっている。これにより、車両の後面衝突時にリヤサイドメンバに生じる曲げモーメントを小さくすることができる。しかも、リヤサスペンションメンバが一対のリヤサイドメンバの曲り部における車幅方向内側面に連結されて一対のリヤサイドメンバ間に掛け渡されている。このため、リヤサイドメンバの曲り部が車体後方側からの荷重によって車幅方向内側へ撓むことを、リヤサスペンションメンバによって抑えることができる。したがって、部品点数及び重量の増加を抑制しつつ、車両の後面衝突時におけるリヤサイドメンバの座屈を抑制することができる。   In the vehicle body rear structure according to the fourth aspect, the inner side in the vehicle width direction of the bent portion of the rear side member is bent so as to reduce the area of the closed cross section constituted by the rear side member. For this reason, in the bent portion of the rear side member, the centroid of the closed cross section is arranged on the outer side in the vehicle width direction than the case where the bent portion is omitted, and the curvature of the centroid of the closed cross section is It is smaller than the curvature of the bent part itself. Thereby, the bending moment which arises in a rear side member at the time of the rear surface collision of vehicles can be made small. Moreover, the rear suspension member is connected to the inner side surface in the vehicle width direction at the bent portion of the pair of rear side members and is spanned between the pair of rear side members. Therefore, the rear suspension member can prevent the bent portion of the rear side member from bending inward in the vehicle width direction due to the load from the rear side of the vehicle body. Accordingly, it is possible to suppress buckling of the rear side member at the time of a rear collision of the vehicle while suppressing an increase in the number of parts and weight.

以上説明したように、本発明に係る車体後部構造では、部品点数及び重量を増加させることなく、後面衝突時におけるリヤサイドメンバの座屈を抑制することができる。   As described above, in the vehicle body rear structure according to the present invention, it is possible to suppress buckling of the rear side member at the time of rear collision without increasing the number of parts and weight.

図１には、本発明の実施形態に係る車体後部構造が適用されて構成された車体後部１０の部分的な構成が車体上方側から見た平面図で模式的に示されている。また、図２には、図１の２−２線断面図が示されている。なお、図中矢印ＦＲは車体前方向を示し、矢印ＵＰは車体上方向を示し、矢印ＩＮは車幅内側方向を示している。   FIG. 1 schematically shows a partial configuration of a vehicle body rear portion 10 configured by applying a vehicle body rear structure according to an embodiment of the present invention, as viewed from above the vehicle body. 2 shows a cross-sectional view taken along line 2-2 of FIG. In the figure, the arrow FR indicates the vehicle body front direction, the arrow UP indicates the vehicle body upward direction, and the arrow IN indicates the vehicle width inside direction.

図１に示されるように、車体後部１０には、リヤフロアパネルが配設されている。リヤフロアパネル１２の車体後方側には、収納凹部１２Ａが形成されており、この収納凹部１２Ａにスペアタイヤ（図示省略）が収納可能とされている。また、リヤフロアパネル１２の車幅方向両側部には、リヤタイヤ１４及びリヤサスペンション１６（図２参照）を配置させるための切欠部１２Ｂが形成されている。さらに、リヤフロアパネル１２の車幅方向両側部には、車体の骨格を構成する左右一対のリヤサイドメンバ１８が車体前後方向を長手方向として配置されている。   As shown in FIG. 1, a rear floor panel is disposed at the vehicle body rear portion 10. A storage recess 12A is formed on the vehicle rear side of the rear floor panel 12, and a spare tire (not shown) can be stored in the storage recess 12A. Further, notches 12B for arranging the rear tire 14 and the rear suspension 16 (see FIG. 2) are formed on both sides of the rear floor panel 12 in the vehicle width direction. Further, a pair of left and right rear side members 18 constituting the skeleton of the vehicle body are disposed on both sides in the vehicle width direction of the rear floor panel 12 with the vehicle body longitudinal direction as the longitudinal direction.

図３に示されるように、各リヤサイドメンバ１８は、左右の側壁１８Ａ、１８Ｂと、各側壁１８Ａ、１８Ｂの下端部を連結する底壁１８Ｃと、各側壁１８Ａ、１８Ｂの上端部から互いに離間する方向に延出されたフランジ部１８Ｄ、１８Ｅとを有しており、車体正面側から見た形状が開口部を車体上方側へ向けた略ハット形状に形成されている。これらのリヤサイドメンバ１８は、フランジ部１８Ｄ、１８Ｅがスポット溶接等によってリヤフロアパネル１２の下面に結合されることでリヤフロアパネル１２に取り付けられており、リヤフロアパネル１２と共に閉断面２０を構成している。これらの閉断面２０は、各リヤサイドメンバ１８の長手方向に沿って延在している。   As shown in FIG. 3, the rear side members 18 are spaced apart from the left and right side walls 18A, 18B, the bottom wall 18C connecting the lower ends of the side walls 18A, 18B, and the upper ends of the side walls 18A, 18B. It has flange portions 18D and 18E extending in the direction, and the shape seen from the front side of the vehicle body is formed in a substantially hat shape with the opening portion directed upward of the vehicle body. These rear side members 18 are attached to the rear floor panel 12 by connecting flange portions 18D and 18E to the lower surface of the rear floor panel 12 by spot welding or the like, and constitute a closed section 20 together with the rear floor panel 12. These closed sections 20 extend along the longitudinal direction of each rear side member 18.

各リヤサイドメンバ１８の長手方向中間部には、リヤタイヤ１４に対向する位置に、折れ曲り部１９が形成されており、各リヤサイドメンバ１８の長手方向中間部は、互いに接近する方向（車幅内側）へ突出している。   A bent portion 19 is formed at a position opposite to the rear tire 14 at a middle portion in the longitudinal direction of each rear side member 18, and the middle portion in the longitudinal direction of each rear side member 18 is in a direction approaching each other (vehicle width inside). Protruding to

リヤサイドメンバ１８の折れ曲り部１９における車幅方向内側の側壁１８Ａは、断面が略く字状に折れ曲っており、下端側の部分が車体上下方向に対して大きく傾斜した傾斜部２２とされている。この傾斜部２２は、折れ曲り部１９の前後両側へ向かうに従い徐々に小さくなるように形成されており、図１に示される範囲Ｌにわたって形成されている。   The side wall 18A on the inner side in the vehicle width direction of the bent portion 19 of the rear side member 18 is bent into a substantially square shape in cross section, and the lower end portion is an inclined portion 22 that is greatly inclined with respect to the vehicle body vertical direction. Yes. The inclined portion 22 is formed so as to gradually become smaller toward the front and rear sides of the bent portion 19 and is formed over a range L shown in FIG.

すなわち、本実施形態に係るリヤサイドメンバ１８では、折れ曲り部１９を含む上記範囲Ｌの車幅方向内側部分が、閉断面２０の面積を縮小させるように抉れている。このため、図１に示されるように、閉断面２０の図心Ｓ１は、折れ曲り部１９の周辺において、上記抉れ部が省略された場合の図心（図４の図心Ｓ２参照、閉断面２０の車幅方向中央部）よりも車幅方向外側に配置されている。このため、折れ曲り部１９の周辺において、図心Ｓ１の曲率が折れ曲り部１９自体の曲率よりも小さくなっており（図心Ｓ１の曲り度合いが折れ曲り部１９の曲り度合いよりも小さくなっており）、平面視で図心Ｓ１が直線的になっている。   That is, in the rear side member 18 according to the present embodiment, the inner portion in the vehicle width direction of the range L including the bent portion 19 is bent so as to reduce the area of the closed section 20. For this reason, as shown in FIG. 1, the centroid S1 of the closed section 20 has a centroid when the bent portion is omitted around the bent portion 19 (see the centroid S2 in FIG. It is arranged on the outer side in the vehicle width direction with respect to the section 20 in the vehicle width direction. For this reason, the curvature of the centroid S1 is smaller than the curvature of the bent part 19 itself in the vicinity of the bent part 19 (the degree of bending of the centroid S1 is smaller than the bent degree of the bent part 19). The centroid S1 is linear in plan view.

一方、一対のリヤサイドメンバ１８の折れ曲り部１９には、リヤサスペンション１６を支持するためのリヤサスペンションメンバ２４が連結されている（図２参照）。なお、本実施形態に係る車体後部構造は、車幅方向中心線に対し左右対称に構成されているので、以下、基本的に車幅方向の一方側について説明することとする。   On the other hand, a rear suspension member 24 for supporting the rear suspension 16 is connected to the bent portions 19 of the pair of rear side members 18 (see FIG. 2). In addition, since the vehicle body rear part structure according to the present embodiment is configured to be bilaterally symmetrical with respect to the vehicle width direction center line, only one side in the vehicle width direction will be basically described below.

このリヤサスペンションメンバ２４は、車幅方向中央部に配置された本体部２４Ａ（長手方向中間部）が車幅方向に沿って延在している。また、リヤサスペンションメンバ２４の長手方向両端側は、車幅方向外側へ向けて上昇する傾斜部２４Ｂとされており、各傾斜部２４Ｂは、各リヤサイドメンバ１８の傾斜部２２の法線方向に沿って延在している。各傾斜部２４Ｂの下端部（車幅方向内側端部）には、リヤサスペンション１６を介してリヤタイヤ１４が連結されている。また、各傾斜部２４Ｂの上端部（リヤサスペンションメンバ２４の長手方向両端部）は、ボデーマウント２６を介して各リヤサイドメンバ１８の傾斜部２２（車幅方向内側面）に連結されている。   The rear suspension member 24 has a main body portion 24A (longitudinal intermediate portion) disposed at the center in the vehicle width direction extending along the vehicle width direction. Further, both end sides in the longitudinal direction of the rear suspension member 24 are inclined portions 24B that rise outward in the vehicle width direction, and each inclined portion 24B is along the normal direction of the inclined portion 22 of each rear side member 18. It is extended. A rear tire 14 is connected to a lower end portion (an inner end portion in the vehicle width direction) of each inclined portion 24B via a rear suspension 16. Further, the upper end portions (both ends in the longitudinal direction of the rear suspension member 24) of the inclined portions 24B are coupled to the inclined portions 22 (inner side surfaces in the vehicle width direction) of the rear side members 18 via the body mounts 26.

各ボデーマウント２６は、リヤサイドメンバ１８の傾斜部２２及びリヤサスペンションメンバ２４の傾斜部２４Ｂの車体上下方向に対する傾斜角度に対応して傾斜して配置されている。これらのボデーマウント２６は、弾性部材２８（例えばゴム等）を含んで構成されており、リヤサスペンションメンバ２４と各リヤサイドメンバ１８とを弾性的に連結している。   Each body mount 26 is disposed to be inclined corresponding to the inclination angle of the inclined portion 22 of the rear side member 18 and the inclined portion 24B of the rear suspension member 24 with respect to the vehicle body vertical direction. These body mounts 26 are configured to include an elastic member 28 (for example, rubber or the like), and elastically connect the rear suspension member 24 and each rear side member 18.

ここで、図３に示されるように、各ボデーマウント２６の入力部２６Ａ（ボデーマウント２６の断面の幾何形状の図心であり荷重入力中心）には、車体の重量の一部（図３の矢印Ｆ１参照）が入力されると共に、車両走行時に地面からリヤタイヤ１４に入力される荷重（図２の矢印Ｆ２参照）の一部がリヤサスペンション１６及びリヤサスペンションメンバ２４を介して入力される（図３の矢印Ｆ３参照）。これらの荷重の合力Ｆ４は、上記入力部２６Ａに対して車幅方向内側へ斜め下向きに作用するが、本実施形態では、ボデーマウント２６の入力部２６Ａに対して前記合力Ｆ４の作用方向と反対方向にリヤサイドメンバ１８の図心Ｓ１が配置されている。なお、本実施形態では、リヤサイドメンバ１８の図心Ｓ１は、車両の所定の走行状態（直進走行時もしくは旋回走行時）において、ボデーマウント２６の入力部２６Ａを通り上記合力Ｆ４の作用方向に沿った線分Ａ上又はこの付近に配置されるようになっている。   Here, as shown in FIG. 3, the input portion 26A of each body mount 26 (the centroid of the geometric shape of the cross section of the body mount 26 and the load input center) has a part of the weight of the vehicle body (in FIG. 3). (See arrow F1) and a part of the load (see arrow F2 in FIG. 2) input from the ground to the rear tire 14 when the vehicle travels is input via the rear suspension 16 and the rear suspension member 24 (see FIG. 2). 3 arrow F3). The resultant force F4 of these loads acts obliquely downward inward in the vehicle width direction with respect to the input portion 26A, but in the present embodiment, it is opposite to the direction in which the resultant force F4 acts on the input portion 26A of the body mount 26. The centroid S1 of the rear side member 18 is arranged in the direction. In the present embodiment, the centroid S1 of the rear side member 18 passes along the direction of action of the resultant force F4 through the input portion 26A of the body mount 26 in a predetermined traveling state of the vehicle (straight traveling or turning). It is arranged on or near the line segment A.

次に、本実施形態の作用について説明する。   Next, the operation of this embodiment will be described.

本実施形態では、リヤサイドメンバ１８の折れ曲り部１９の車幅方向内側が、リヤサイドメンバ１８とリヤフロアパネル１２との閉断面２０の面積を縮小させるように抉れている。このため、図３に示されるように、リヤサイドメンバ１８の折れ曲り部１９において、閉断面２０の図心Ｓ１の曲率が折れ曲り部１９自体の曲率よりも小さくなっており、平面視で図心Ｓ１が直線的になっている。したがって、車両後方からの衝撃荷重（図１の矢印Ｆ５参照）の入力時にリヤサイドメンバ１８に生じる曲げモーメントを、上記抉れ部が省略されている場合よりも小さくすることができる。   In the present embodiment, the inner side in the vehicle width direction of the bent portion 19 of the rear side member 18 is bent so as to reduce the area of the closed cross section 20 between the rear side member 18 and the rear floor panel 12. For this reason, as shown in FIG. 3, in the bent portion 19 of the rear side member 18, the curvature of the centroid S1 of the closed section 20 is smaller than the curvature of the bent portion 19 itself, and the centroid in plan view. S1 is linear. Therefore, the bending moment generated in the rear side member 18 when an impact load (see arrow F5 in FIG. 1) from the rear of the vehicle is input can be made smaller than in the case where the bend portion is omitted.

しかも、本実施形態では、リヤサスペンション１６を支持するリヤサスペンションメンバ２４が、一対のリヤサイドメンバ１８の折れ曲り部１９における車幅方向内側面（傾斜部２２）に連結されて一対のリヤサイドメンバ１８間に掛け渡されている。このため、車両後方からの衝撃荷重によってリヤサイドメンバ１８の折れ曲り部１９が車幅方向内側へ撓むことをリヤサスペンションメンバ２４によって抑えることができる。   In addition, in the present embodiment, the rear suspension member 24 that supports the rear suspension 16 is connected to the inner side surface (inclined portion 22) in the vehicle width direction of the bent portion 19 of the pair of rear side members 18 so as to be between the pair of rear side members 18. It is stretched over. For this reason, the rear suspension member 24 can prevent the bent portion 19 of the rear side member 18 from being bent inward in the vehicle width direction due to an impact load from the rear of the vehicle.

以上のことから、本実施形態では、車両の後面衝突時におけるリヤサイドメンバ１８の座屈を効果的に抑制することができる。しかも、リヤサイドメンバ１８の座屈を抑制するために新しい部品を追加する必要がないため、車両の部品点数の削減及び車両重量の軽量化を図ることができる。   From the above, in this embodiment, buckling of the rear side member 18 at the time of a rear collision of the vehicle can be effectively suppressed. Moreover, since it is not necessary to add new parts to suppress buckling of the rear side member 18, the number of parts of the vehicle can be reduced and the weight of the vehicle can be reduced.

さらに、本実施形態では、リヤサイドメンバ１８とリヤフロアパネル１２とによって構成された閉断面２０の図心Ｓ１が、ボデーマウント２６の入力部２６Ａに対して当該入力部２６Ａに入力される荷重の合力Ｆ４の作用方向と反対方向に配置されている。このため、ボデーマウント２６に入力される荷重によってリヤサイドメンバ１８に捩りモーメントが発生することを抑制できる。   Further, in the present embodiment, the centroid S1 of the closed section 20 constituted by the rear side member 18 and the rear floor panel 12 is the resultant force F4 of the load input to the input portion 26A with respect to the input portion 26A of the body mount 26. It is arranged in the direction opposite to the direction of action. For this reason, it can suppress that the torsional moment generate | occur | produces in the rear side member 18 with the load input into the body mount 26. FIG.

なお、図５に示される従来の車体後部構造では、リヤサイドメンバ１００とリヤフロアパネル１０２とによって構成された閉断面１０４の図心Ｓ３が、ボデーマウント１０４の入力部１０４Ａに対して当該入力部１０４Ａ入力される荷重の合力Ｆ６の作用方向と反対方向に配置されておらず、入力部１０４Ａを通り上記合力Ｆ６の作用方向に沿った線分Ｂから大きく離れて配置されている。このため、ボデーマウント１０４に入力される荷重によって、リヤサイドメンバ１００に捩りモーメント（図６の矢印Ｍ参照）が発生する。この点、本実施形態では、このような捩りモーメントの発生を防止することができるので、車体も含めた剛性（バネ定数）を従来の車体後部構造に比べて向上させることができる。   In the conventional vehicle body rear structure shown in FIG. 5, the centroid S3 of the closed section 104 formed by the rear side member 100 and the rear floor panel 102 is input to the input portion 104A of the body mount 104. It is not arranged in the direction opposite to the direction of action of the resultant force F6 of the load to be applied, but is arranged far away from the line segment B along the direction of action of the resultant force F6 through the input portion 104A. For this reason, a torsional moment (see arrow M in FIG. 6) is generated in the rear side member 100 due to the load input to the body mount 104. In this regard, in the present embodiment, since the generation of such a torsional moment can be prevented, the rigidity (spring constant) including the vehicle body can be improved as compared with the conventional vehicle body rear structure.

本発明の実施形態に係る車体後部構造が適用されて構成された車体後部の部分的な構成を示す模式的な平面図である。1 is a schematic plan view showing a partial configuration of a vehicle body rear portion configured by applying a vehicle body rear structure according to an embodiment of the present invention. 本発明の実施形態に係る車体後部構造が適用されて構成された車体後部の部分的な構成を示し、図１の２−２線に対応する断面図である。FIG. 2 is a cross-sectional view corresponding to line 2-2 in FIG. 1, showing a partial configuration of a vehicle body rear portion configured by applying the vehicle body rear structure according to the embodiment of the present invention. 図２の一部を拡大した断面図である。It is sectional drawing to which a part of FIG. 2 was expanded. 図１に示される車体後部構造においてリヤサイドメンバの抉れ部が省略された場合のリヤサイドメンバの図心について説明するための図である。FIG. 3 is a view for explaining the centroid of the rear side member when the bent portion of the rear side member is omitted in the vehicle body rear structure shown in FIG. 1. 従来の車体後部構造を示す断面図である。It is sectional drawing which shows the conventional vehicle body rear part structure.

符号の説明Explanation of symbols

１２ リヤフロアパネル
１８ リヤサイドメンバ
１９ 折れ曲り部
２０ 閉断面
２４ リヤサスペンションメンバ
２６Ａ 入力部
Ｓ１ リヤサイドメンバの図心 12 Rear floor panel 18 Rear side member 19 Bent part 20 Closed section 24 Rear suspension member 26A Input part S1 Centroid of rear side member

Claims (4)

車体後部の車幅方向側部に車体前後方向を長手方向として配置され、長手方向中間部が車幅方向内側へ突出するように曲ると共に、閉断面を構成し、前記閉断面の図心が前記曲り部において前記閉断面の車幅方向中央部よりも車幅方向外側に配置されたリヤサイドメンバを有する車体後部構造。   The vehicle body longitudinal direction is arranged at the vehicle width direction side part at the rear part of the vehicle body, the middle part in the longitudinal direction is bent so as to protrude inward in the vehicle width direction, and a closed cross section is formed. A vehicle body rear structure having a rear side member disposed at an outer side in the vehicle width direction than a central portion in the vehicle width direction of the closed section at the bent portion. 車体後部の車幅方向側部に車体前後方向を長手方向として配置され、長手方向中間部が車幅方向内側へ突出するように曲ると共に、閉断面を構成し、前記曲り部の車幅方向内側が前記閉断面の面積を縮小させるように抉れたリヤサイドメンバを有する車体後部構造。   The vehicle body longitudinal direction is arranged at the vehicle width direction side part of the rear part of the vehicle body, and the middle part in the longitudinal direction bends so as to protrude inward in the vehicle width direction, forms a closed cross section, and the vehicle width direction of the bent part A vehicle body rear structure having a rear side member that is curled so that the inner side thereof reduces the area of the closed section. 車体後部の車幅方向両側部に車体前後方向を長手方向として配置され、長手方向中間部が車幅方向内側へ突出するように曲がった左右一対のリヤサイドメンバと、
前記一対のリヤサイドメンバの前記曲り部における車幅方向内側面に連結されて両者の間に掛け渡されたリヤサスペンションメンバと、
を有する車体後部構造。 A pair of left and right rear side members that are disposed on both sides in the vehicle width direction of the rear of the vehicle body with the vehicle body longitudinal direction as the longitudinal direction, and bent in such a manner that the middle portion in the longitudinal direction protrudes inward in the vehicle width direction;
A rear suspension member connected to the inner side surface in the vehicle width direction of the bent portion of the pair of rear side members and spanned between the two,
A vehicle body rear structure. 車体後部の車幅方向両側部に車体前後方向を長手方向として配置され、長手方向中間部が車幅方向内側へ突出するように曲ると共に、閉断面を構成し、前記曲り部の車幅方向内側が前記閉断面の面積を縮小させるように抉れた左右一対のリヤサイドメンバと、
前記一対のリヤサイドメンバの前記抉れ部に連結されて両者の間に掛け渡されたリヤサスペンションメンバと、
を有する車体後部構造。 The vehicle body longitudinal direction is arranged on both sides in the vehicle width direction at the rear of the vehicle body, and the middle portion in the longitudinal direction is bent so as to protrude inward in the vehicle width direction, and a closed cross section is formed, and the vehicle width direction of the bent portion A pair of left and right rear side members whose inside is rolled to reduce the area of the closed cross section;
A rear suspension member coupled to the bent portion of the pair of rear side members and spanned between the two;
A vehicle body rear structure.
JP2007177445A 2007-07-05 2007-07-05 Car body rear structure Expired - Fee Related JP5003319B2 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011067825A1 (en) * 2009-12-01 2011-06-09 トヨタ自動車株式会社 Rear body structure for vehicle

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6045484A (en) * 1983-08-19 1985-03-11 Nissan Motor Co Ltd Body structure for automobile
JPS63128181U (en) * 1987-02-16 1988-08-22

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6045484A (en) * 1983-08-19 1985-03-11 Nissan Motor Co Ltd Body structure for automobile
JPS63128181U (en) * 1987-02-16 1988-08-22

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011067825A1 (en) * 2009-12-01 2011-06-09 トヨタ自動車株式会社 Rear body structure for vehicle
JP5435037B2 (en) * 2009-12-01 2014-03-05 トヨタ自動車株式会社 Rear body structure of the vehicle

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