JP4889550B2

JP4889550B2 - Rear structure of the car body

Info

Publication number: JP4889550B2
Application number: JP2007094885A
Authority: JP
Inventors: 拓生中村; 康司藤井; 速水中川; 哲史柳本; 真人小野寺; 文谷天野
Original assignee: Ahresty Corp; Mitsubishi Motors Corp
Current assignee: Ahresty Corp; Mitsubishi Motors Corp
Priority date: 2007-03-30
Filing date: 2007-03-30
Publication date: 2012-03-07
Anticipated expiration: 2027-03-30
Also published as: JP2008247360A

Description

本発明は、車体の後部構造、特に、車室後部のリアピラとサイドメンバ及びクロスメンバの結合構成を改善できる車体の後部構造に関する。 The present invention relates to a rear structure of a vehicle body, and more particularly to a rear structure of a vehicle body that can improve the coupling structure of a rear pillar, a side member, and a cross member at the rear of a vehicle compartment.

自動車の後部車体は、複数の後部車体構成部材を組み付けて形成される。複数の後部車体構成部材としては、例えば、左右のリアピラ、車室の後席後部の隔壁、左右リアフェンダ、トランクリッド、リアボード等があり、これらがトランクルームを覆う。更に、トランクルームの床部は左右サイドメンバに一体結合されたフロア材により形成され、このフロア材の周縁部は左右のリアピラ等に一体結合されている。
このように後部車体を形成する後部車体構成部材は、従来、板金製が多く、これらは相互に溶接、即ちスポット溶接やアーク溶接によって一体的に結合され、各構成部材の結合によって後部車体の剛性強化が図られている。 The rear body of an automobile is formed by assembling a plurality of rear body components. Examples of the plurality of rear body constituent members include left and right rear pillars, partition walls at the rear rear portion of the passenger compartment, left and right rear fenders, a trunk lid, and a rear board. These cover the trunk room. Further, the floor portion of the trunk room is formed by a floor material integrally coupled to the left and right side members, and the peripheral edge portion of the floor material is integrally coupled to the left and right rear pillars.
Conventionally, the rear body constituent members forming the rear body are often made of sheet metal, and these are integrally connected to each other by welding, that is, spot welding or arc welding. Strengthening is planned.

例えば、図８、９（ａ）（ｂ）に示すように、車体後部の基枠部は、左右サイドメンバ１００（左側のみ示す）にサスクロスメンバ１１０の両端が締結される。この場合、各サイドメンバ１００は逆ハット型の断面形状を採る場合が多く、その断面形状のまま長手方向に連続形成されている。しかも、各サイドメンバ１００のフランジｆ１がフロア１２０の下面に重合され、相互にスポット溶接されることで剛性強化に適した閉断面構造部が形成されている。 For example, as shown in FIGS. 8, 9 (a) and 9 (b), the both ends of the suspension cross member 110 are fastened to the left and right side members 100 (only the left side is shown). In this case, each side member 100 often has an inverted hat-shaped cross-sectional shape, and is continuously formed in the longitudinal direction while maintaining the cross-sectional shape. In addition, the flange f1 of each side member 100 is superposed on the lower surface of the floor 120 and spot-welded to each other, thereby forming a closed cross-section structure portion suitable for rigidity enhancement.

ところで、サイドメンバ１００の低壁面ｆ２に対してサスクロスメンバ１１０が前後２点である前後端部１３０ｆ、１３０ｒでそれぞれ締結される場合、次のような構造を採ることとなる。即ち、サイドメンバ１００はタイヤハウスＴＨ（図８参照）との対向部分において傾斜し、図９（ａ）に示すように、湾曲する部分ｒが存在する。このような湾曲部分ｒにおいて、サスクロスメンバ１１０の前端部１３０ｆが結合される場合、両者間での傾斜面の精度管理を容易化するためブラケット１４０が使用される。この場合、ブラケット１４０内やサイドメンバ１００内に袋ナット１５０が予め溶着される。その袋ナット１５０にボルト１６０が螺着されることにより、サスクロスメンバ１１０の前端部１３０ｆがサイドメンバの低壁面ｆ２に締結されることとなる。なお、後端部１３０ｒが締結されるサイドメンバの低壁面ｆ２はフラットであるが、この場合、サイドメンバ１００内に補強片１７０を用いて袋ナット１５０が予め溶着され、袋ナット１５０にボルト１６０が螺着されることとなる。 By the way, when the suspension cross member 110 is fastened to the low wall surface f2 of the side member 100 at the front and rear end portions 130f and 130r, which are two front and rear points, the following structure is adopted. That is, the side member 100 is inclined at a portion facing the tire house TH (see FIG. 8), and there is a curved portion r as shown in FIG. 9A. In such a curved portion r, when the front end portion 130f of the suspension cross member 110 is coupled, the bracket 140 is used to facilitate the accuracy control of the inclined surface between the two. In this case, the cap nut 150 is welded in advance in the bracket 140 or the side member 100. When the bolt 160 is screwed to the cap nut 150, the front end portion 130f of the suspension cross member 110 is fastened to the low wall surface f2 of the side member. The low wall surface f2 of the side member to which the rear end portion 130r is fastened is flat. In this case, the cap nut 150 is welded in advance in the side member 100 using the reinforcing piece 170, and the bolt 160 is attached to the cap nut 150. Will be screwed.

なお、このようなクロスメンバをボルトにより左右サイドメンバの低壁に締結した一例が特開２０００−１０３３５７号公報（引用文献１）に開示される。 An example in which such a cross member is fastened to the low walls of the left and right side members with bolts is disclosed in Japanese Patent Laid-Open No. 2000-103357 (Cited Document 1).

特開２０００−１０３３５７号公報（図２）JP 2000-103357 A (FIG. 2)

ところで、車体後部に過度の衝撃荷重が加わるような場合、乗員保護の上で車室空間の変形を抑制する必要がある。
衝撃荷重が車体後部に加わると、左右サイドメンバ１００やフロア材１２０、不図示の左右リアフェンダに伝達される。この際、左右サイドメンバ１００にボルト結合されたサスクロスメンバ１１０に対して衝撃荷重が伝達され吸収され、更に、左右サイドメンバ１００より車体基枠側に衝撃荷重が分散され吸収されることが望ましい。 By the way, when an excessive impact load is applied to the rear part of the vehicle body, it is necessary to suppress the deformation of the passenger compartment space for protecting the passenger.
When an impact load is applied to the rear part of the vehicle body, it is transmitted to the left and right side members 100, the floor material 120, and left and right rear fenders (not shown). At this time, it is desirable that the impact load is transmitted and absorbed to the suspension member 110 that is bolted to the left and right side members 100, and further, the impact load is distributed and absorbed from the left and right side members 100 to the vehicle body frame side. .

ところが、左右サイドメンバ１００にボルト結合されたサスクロスメンバ１１０の前後端部１３０ｆ、１３０ｒは、上述のようにブラケット１４０や、袋ナット１５０を介してサイドメンバ１００や補強片１７０に溶接されている。これらブラケット１４０や補強片１７０はそれ自体が薄板であり、過荷重により変形し易い。しかも、これら各溶接箇所はフランジを介し間欠的にスポット溶接される部位が多い。このような結合構造ではスポット溶接箇所が衝撃荷重を受けた際に変形を生じ、左右サイドメンバ１００とサスクロスメンバ１１０が相対変位してしまう。 However, the front and rear end portions 130f and 130r of the suspension cross member 110 bolted to the left and right side members 100 are welded to the side member 100 and the reinforcing piece 170 via the bracket 140 and the cap nut 150 as described above. . The bracket 140 and the reinforcing piece 170 are thin plates themselves and are easily deformed by an overload. In addition, each of these welding locations is often spot-welded intermittently via a flange. In such a coupling structure, the spot welded portion is deformed when subjected to an impact load, and the left and right side members 100 and the suspension cross member 110 are relatively displaced.

このように、従来の板金製のブラケット１４０や補強片１７０を用いて、サスクロスメンバ１１０が左右サイドメンバ１００に締結される構成を採る場合、サスクロスメンバ１１０が衝撃荷重を分散させ吸収させるという機能を十分に発揮できず、改善が望まれている。 As described above, when the suspension member 110 is fastened to the left and right side members 100 using the conventional sheet metal bracket 140 and the reinforcing piece 170, the suspension member 110 disperses and absorbs the impact load. The function cannot be fully exhibited, and improvement is desired.

本発明は、上述の課題に着目してなされたもので、車体後部が衝撃荷重を受けた場合において、左右サイドメンバに伝達された衝撃荷重をクロスメンバに十分伝達して、クロスメンバにより衝撃荷重を分散吸収させるという機能を十分に発揮させることができる車体の後部構造を提供することを目的とする。 The present invention has been made paying attention to the above-mentioned problems. When the rear part of the vehicle body receives an impact load, the impact load transmitted to the left and right side members is sufficiently transmitted to the cross member, and the impact load is generated by the cross member. An object of the present invention is to provide a rear structure of a vehicle body that can sufficiently exhibit the function of dispersing and absorbing the vehicle.

上述の目的を達成するために、請求項１記載の発明は、車室後部の左右にリアピラがそれぞれ配備された車体の後部構造において、前記各リアピラのインナ部材が、車室後側部の剛性を確保するリアピラインナ下壁部と、車両前後方向に長いサイドメンバの前部と、同前部に端部が対向配備されたクロスメンバを締結する前後２つのボルト締結部とを一体的に有するようダイカスト成形され、前記インナ部材には前記サイドメンバ前部の後端より後方に向けて連続して、前記サイドメンバの後部を成す後部部材の先端部が嵌合されるサイドメンバ連結部が延設され、前記サイドメンバ連結部に前記前後２つのボルト締結部のうち少なくとも後ボルト締結部が形成されたことを特徴とする。 In order to achieve the above-described object, the invention according to claim 1 is the rear structure of the vehicle body in which the rear pillars are respectively provided on the left and right sides of the rear part of the passenger compartment, and the inner member of each rear pillar has a rigidity of the rear part of the passenger compartment. A rear pillar line lower wall portion that secures the vehicle, a front portion of a side member that is long in the vehicle front-rear direction, and two front and rear bolt fastening portions that fasten a cross member that is oppositely disposed at the front portion. The inner member is continuously cast from the rear end of the front side of the side member toward the rear, and the side member connecting portion is fitted to the front member of the rear member that forms the rear portion of the side member. The side member connecting portion is formed with at least a rear bolt fastening portion of the two front and rear bolt fastening portions.

請求項２記載の発明は、請求項１記載の車体の後部構造において、前記インナ部材の前記サイドメンバ前部には前記前後２つのボルト締結部のうちの前ボルト締結部が一体形成されたことを特徴とする。 According to a second aspect of the present invention, in the rear structure of the vehicle body according to the first aspect, a front bolt fastening portion of the two front and rear bolt fastening portions is integrally formed on the front side member of the inner member. It is characterized by.

請求項３記載の発明は、請求項１記載の車体の後部構造において、前記前後２つのボルト締結部には前記クロスメンバを締結する締結ボルトが螺着されるパイプナットが形成されることを特徴とする。 According to a third aspect of the present invention, in the rear structure of the vehicle body according to the first aspect, a pipe nut to which a fastening bolt for fastening the cross member is screwed is formed in the two front and rear bolt fastening portions. And

請求項４記載の発明は、請求項１記載の車体の後部構造において、前記後ボルト締結部のパイプナットはその下部が前記サイドメンバ連結部の低壁に溶接され、上端はパイプナットに嵌着された前記後部部材の溶接穴に溶接されたことを特徴とする。 According to a fourth aspect of the present invention, in the rear structure of the vehicle body according to the first aspect, the pipe nut of the rear bolt fastening portion is welded to the lower wall of the side member connecting portion, and the upper end is fitted to the pipe nut. It was welded to the welded hole of the rear member.

請求項５記載の発明は、請求項１記載の車体の後部構造において、請求項１乃至４のいずれか１つの車体の後部構造において、前記クロスメンバはリアサスペンション構成部材を支持するサスクロスメンバであることを特徴とする。 According to a fifth aspect of the present invention, in the rear structure of the vehicle body according to the first aspect, in the rear structure of the vehicle body according to any one of the first to fourth aspects, the cross member is a suspension cross member that supports a rear suspension constituent member. It is characterized by being.

請求項１記載の車体の後部構造によれば、各リアピラのインナ部材がリアピラインナ下壁部とサイドメンバ前部と２つのボルト締結部とを一体的に有するようダイカスト成形され、しかもサイドメンバ連結部が延設され、サイドメンバ前部が結合されるので、後方からの衝撃荷重を受けた際に、衝撃荷重の入力部に近いサスクロスメンバが左右のインナロアより衝撃荷重を確実に受けて分散吸収でき、サスクロスメンバより入力部に対して遠い後席クロスメンバやそれに結合された後席隔壁側への衝撃荷重の入力量を低減できる。このため、後席隔壁側の変形、即ち、車室変形を抑制でき、乗員の安全性を確保できる。 According to the rear structure of the vehicle body according to claim 1, the inner member of each rear pillar is die-cast so as to integrally have a rear pillar lower wall portion, a side member front portion, and two bolt fastening portions, and the side member connecting portion. Is extended and the front part of the side member is joined, so that when the impact load is applied from the rear, the suspension member close to the input part of the impact load receives the impact load from the left and right inner lowers and absorbs dispersion. In addition, it is possible to reduce the input amount of the impact load to the rear seat cross member that is farther from the input portion than the suspension cross member and to the rear seat partition wall that is coupled thereto. For this reason, the deformation | transformation by the side of a rear seat partition, ie, a vehicle interior deformation, can be suppressed and a passenger | crew's safety can be ensured.

請求項２記載の車体の後部構造によれば、ダイカスト製のインナ部材の一部として前ボルト締結部が形成されるので、衝撃荷重をインナ部材よりクロスメンバに確実に伝達でき、クロスメンバによる衝撃荷重の分散吸収を確実に図れ、車体後部の剛性の強化を図れ、車室変形を抑制でき、乗員の安全性を確保できる。 According to the rear structure of the vehicle body according to claim 2, since the front bolt fastening portion is formed as a part of the die-cast inner member, the impact load can be reliably transmitted from the inner member to the cross member, and the impact by the cross member It is possible to reliably absorb and absorb the load, to enhance the rigidity of the rear part of the vehicle body, to suppress the deformation of the passenger compartment, and to ensure the safety of the passenger.

請求項３記載の車体の後部構造によれば、インナ部材の一部として形成される前後ボルト締結部がパイプナットを供えるので、クロスメンバのボルトによる締結作業性が向上し、しかも、衝撃荷重をインナ部材よりクロスメンバに確実に伝達できる。 According to the rear structure of the vehicle body according to claim 3, since the front and rear bolt fastening portions formed as part of the inner member provide the pipe nut, the fastening workability by the bolts of the cross member is improved, and the impact load is reduced. It can be reliably transmitted from the inner member to the cross member.

請求項４記載の車体の後部構造によれば、サイドメンバ連結部の低壁に溶接されたパイプナットにサイドメンバの後部部材を嵌合させ、更にパイプナットの上端が後部部材に容易に確実に溶接でき、溶接作業性が向上する。しかも、衝撃荷重をインナ部材よりクロスメンバに確実に伝達できる。 According to the rear structure of the vehicle body according to claim 4, the rear member of the side member is fitted to the pipe nut welded to the lower wall of the side member connecting portion, and the upper end of the pipe nut is easily and reliably secured to the rear member. Welding is possible and welding workability is improved. In addition, the impact load can be reliably transmitted from the inner member to the cross member.

請求項５記載の車体の後部構造によれば、リアピラのインナ部材にサスクロスメンバが締結された場合、インナ部材がリアサスペンションの支持部材として有効利用でき、リアサスペンションの装着性が向上する。 According to the rear structure of the vehicle body of the fifth aspect, when the suspension member is fastened to the inner member of the rear pillar, the inner member can be effectively used as a support member for the rear suspension, and the mounting properties of the rear suspension are improved.

図１にはこの発明の車体の後部構造が適用された自動車の後部車体構造を示した。
ここでの自動車の後部車体は前後方向Ｘに長く延設され、車幅方向Ｙに左右一対配備されるリアサイドメンバ（以後単にサイドメンバ１と記す）と、この左右のサイドメンバ１の先端が溶接される車室Ｒの後席（不図示）の直下の後席クロスメンバ２（図１、２参照）と、左右のサイドメンバ１の前部の中間部を左右に結合するサスクロスメンバ（図１、６参照）と、左右のサイドメンバ１の後端部を左右に結合するリアエンドクロスメンバ３と、サイドメンバ１の前部ａを左右に結合するサスクロスメンバ９とで基枠部が形成され、それら枠基部の上部にはフロア材４が展設されている。 FIG. 1 shows a rear body structure of an automobile to which the rear structure of the vehicle body of the present invention is applied.
Here, the rear body of the automobile extends long in the front-rear direction X, and a pair of left and right rear side members (hereinafter simply referred to as side members 1) arranged in the vehicle width direction Y and the ends of the left and right side members 1 are welded. A suspension cross member (see FIG. 1 and FIG. 2) directly below the rear seat (not shown) of the vehicle compartment R and a front cross section of the left and right side members 1 joined to the left and right. 1 and 6), a rear end cross member 3 that joins the rear ends of the left and right side members 1 to the left and right, and a suspension cross member 9 that joins the front part a of the side members 1 to the left and right. The floor material 4 is laid out on top of these frame bases.

このような枠基部の後席クロスメンバ２側からは後席隔壁５（図１の２点鎖線参照）が上向きに延設され、後席隔壁５の左右端部には左右リアピラ６が縦向きに延設される。更に左右リアピラ６の外側には左右リアフェンダ７が一体結合され、同左右リアフェンダ７の後端は相互にリアパネル８で結合され、これらに四方を囲まれたトランク室ＴＲの上開口は不図示のトランクリッドで開閉される。 A rear seat partition wall 5 (see a two-dot chain line in FIG. 1) extends upward from the rear seat cross member 2 side of the frame base, and left and right rear pillars 6 are vertically oriented at the left and right ends of the rear seat partition wall 5. It is extended to. Further, left and right rear fenders 7 are integrally coupled to the outside of the left and right rear pillars 6, and the rear ends of the left and right rear fenders 7 are coupled to each other by a rear panel 8. The upper opening of the trunk chamber TR surrounded by these four is a trunk (not shown) Opened and closed with lid.

図１、図６に示すように、左右のサイドメンバ１の前部ａを左右に結合するサスクロスメンバ９は左右のサイドメンバ１と共にリアサスペンション１１を支持する。 As shown in FIGS. 1 and 6, a suspension cross member 9 that joins the front portions a of the left and right side members 1 to the left and right supports the rear suspension 11 together with the left and right side members 1.

サスクロスメンバ９は前後主パイプ材１２及び主パイプ材１２を左右で結合する左右の側部パイプ１３とで矩形枠状に一体形成され、その左右端の前後２位置に後述の前後結合端部Ｐ１，Ｐ２が形成される。
更に、図１，２に示すように、サスクロスメンバ９はその左右端が左右車輪Ｗを上下動可能に支持するサスペンション装置の取り付け部として機能する。 The suspension cross member 9 is integrally formed in a rectangular frame shape with the front and rear main pipe members 12 and the left and right side pipes 13 that join the main pipe members 12 on the left and right sides. P1 and P2 are formed.
Further, as shown in FIGS. 1 and 2, the suspension cross member 9 functions as an attachment portion of a suspension device whose left and right ends support the left and right wheels W so as to move up and down.

ここで後輪Ｗを枢支するナックル１６は、トレーリングアーム１７、アッパアーム１８、ロアアーム１９を介してサイドメンバ１やサスクロスメンバ９の側端部の各枢支部ｃに搖動可能に枢支される。更に、後輪Ｗのナックル１６と後述のリアピラインナ下壁部２１の各取り付け部ｄ１、ｄ２との間にはコイルバネ２２、ダンパ２３が配設される。 Here, the knuckle 16 that pivotally supports the rear wheel W is pivotally supported by the pivotal portions c at the side end portions of the side member 1 and the suspension cross member 9 via the trailing arm 17, the upper arm 18, and the lower arm 19. The Further, a coil spring 22 and a damper 23 are disposed between the knuckle 16 of the rear wheel W and mounting portions d1 and d2 of the rear pillar lower wall 21 described later.

左右サイドメンバ１の上部であってサスクロスメンバ９の上方位置には左右リアピラ６が左右対称に形成される。図２に示すように、左のリアピラ６はインナ及びアウタを重ねて縦向き閉断面形状に形成され、この内のリアピラアウタはリアフェンダ７の前端上部より上方に延びる不図示の外壁部と一体形成される。リアピラ６のインナ部材は不図示のインナアッパ（柱部）と、その下部を成す、図２に示すインナロア２４とからなる。 Left and right rear pillars 6 are formed symmetrically on the left and right side members 1 and above the suspension cross member 9. As shown in FIG. 2, the left rear pillar 6 is formed in a vertically closed cross-sectional shape by overlapping an inner and an outer, and the rear pillar outer in this is integrally formed with an outer wall portion (not shown) extending above the upper front end of the rear fender 7. The The inner member of the rear pillar 6 includes an inner upper (column part) (not shown) and an inner lower 24 shown in FIG.

図３乃至図５に示すように、インナロア２４は上縁部が不図示のインナアッパに溶接され車室後側部の剛性を確保するリアピラインナ下壁部２１と、車両前後方向Ｘに長いサイドメンバ１の前部ａと、サイドメンバ１の前部ａに続き後方に連続して延設されるサイドメンバ連結部２５と、サスクロスメンバ９を締結する前後２つのボルト締結部Ｄ１，Ｄ２とを一体的に有するように形成され、全体がアルミ材によるダイカスト成形により形成されている。 As shown in FIG. 3 to FIG. 5, the inner lower 24 has an upper edge portion welded to an inner upper (not shown) and a rear pillar lower wall portion 21 that secures rigidity of a rear side portion of the vehicle compartment, and a side member 1 that is long in the vehicle longitudinal direction X. The front part a, the side member connecting part 25 continuously extending rearward after the front part a of the side member 1, and the two front and rear bolt fastening parts D1 and D2 for fastening the suspension cross member 9 are integrated. The whole is formed by die casting with an aluminum material.

図５に示すように、リアピラインナ下壁部２１は複数の分割壁ｅで区画された複数の閉断面を重ねた剛性強化壁部材を成し、全体はリヤホイールハウスインナ部材として形成されている。リアピラインナ下壁部２１はその外側に取り付けられるアウタ部材であるリアフェンダ７と組み合わされることで、リヤタイヤハウスＴＨを形成する。なお、リアピラインナ下壁部２１はその側方下壁部にトレーリングアーム１７の枢支部２６が、略中央にコイルバネ２２のバネ受け部ｄ１が、その後方にダンパ２３の取り付け部ｄ２がそれぞれ形成される。 As shown in FIG. 5, the rear pillar lower wall portion 21 forms a rigid reinforcing wall member in which a plurality of closed sections defined by a plurality of dividing walls e are stacked, and the entirety is formed as a rear wheel house inner member. The rear pillar line lower wall portion 21 is combined with a rear fender 7 which is an outer member attached to the outside thereof, thereby forming a rear tire house TH. The rear pipeline lower wall portion 21 is formed with a pivotal support portion 26 of the trailing arm 17 on the side lower wall portion thereof, a spring receiving portion d1 of the coil spring 22 at the substantially center, and a mounting portion d2 of the damper 23 at the rear thereof. The

図１、２に示すように、左側のサイドメンバ１は、インナロア２４内に一体形成されたサイドメンバ１の前部ａと、これに続きサイドメンバ連結部２５に先端部が嵌着されるサイドメンバ１の後部を成す後部部材２７とにより形成される。サイドメンバ１の前部ａ先端は後席クロスメンバ２に当接され、相互に溶接される。サイドメンバの前部ａでの前後方向Ｘでの中間部には前ボルト締結部Ｄ１が、後部のサイドメンバ連結部２５での中間部には後ボルト締結部Ｄ２が形成される。
前ボルト締結部Ｄ１は縦螺子穴が形成された前パイプナット２８（図５参照）を備え、この前パイプナット２８の下側開口の開口端がサイドメンバ１前部の底面の延長面とほぼ重なるように形成される。 As shown in FIGS. 1 and 2, the left side member 1 includes a front portion a of the side member 1 integrally formed in the inner lower 24, and a side where the tip end portion is fitted to the side member connecting portion 25. And a rear member 27 that forms the rear of the member 1. The front end a of the side member 1 is brought into contact with the rear seat cross member 2 and welded to each other. A front bolt fastening portion D1 is formed at an intermediate portion in the front-rear direction X of the front portion a of the side member, and a rear bolt fastening portion D2 is formed at an intermediate portion of the side member connecting portion 25 at the rear portion.
The front bolt fastening portion D1 includes a front pipe nut 28 (see FIG. 5) in which a vertical screw hole is formed, and the opening end of the lower opening of the front pipe nut 28 is substantially the same as the extended surface of the bottom surface of the front side of the side member 1. It is formed to overlap.

図７に示すように、前ボルト締結部Ｄ１の要部を成す前パイプナット２８の下向き開口端は水平面であり、ここにサスクロスメンバ９の前結合端部Ｐ１が対向配備される。サスクロスメンバ９の前結合端部Ｐ１は大径パイプ部材の上下を平面状に変形させ、その内部に補強パイプ２９が一体結合されるという形状を成す。前結合端部Ｐ１が前ボルト締結部Ｄ１に当接され、その上で、締結ボルト３１が補強パイプ２９を通して前パイプナット２８に締結されることでサスクロスメンバ９の前結合端部Ｐ１が前ボルト締結部Ｄ１に一体的に結合される。 As shown in FIG. 7, the downward opening end of the front pipe nut 28 that forms the main part of the front bolt fastening portion D 1 is a horizontal plane, and the front coupling end portion P 1 of the suspension member 9 is disposed opposite thereto. The front coupling end portion P1 of the suspension cross member 9 has a shape in which the upper and lower sides of the large-diameter pipe member are deformed into a planar shape, and the reinforcing pipe 29 is integrally coupled therein. The front coupling end portion P1 is brought into contact with the front bolt fastening portion D1, and then the fastening bolt 31 is fastened to the front pipe nut 28 through the reinforcing pipe 29, whereby the front coupling end portion P1 of the suspension cross member 9 is moved forward. It is integrally coupled to the bolt fastening portion D1.

図３、図７に示すように、サイドメンバ連結部２５はＬ型断面を成し、その低壁ｊに縦向きで後パイプナット２８’が環状溶接部ｗ１として溶接される。
サイドメンバ連結部２５には、サイドメンバ１の後部を成す後部部材２７の先端部が嵌着される。この際、後部部材２７には後パイプナットを嵌着させる貫通穴ｈ１が上下に形成され、上側の穴ｈ１は後パイプナット２８’の上端の外周縁と対向する縁部を有する溶接穴として予め形成される。
これにより、図４に示すように、後パイプナット２８’の上端と後部部材２７の溶接穴とが環状溶接部ｗ２として溶接処理され、後パイプナット２８’とサイドメンバ１の後部との結合剛性が確保されている。ここで後ボルト締結部Ｄ２が後パイプナット２８’と、Ｌ型断面の低壁ｊの後パイプナット２８’の下向きの開口縁とで形成されている。 As shown in FIGS. 3 and 7, the side member connecting portion 25 has an L-shaped cross section, and the rear pipe nut 28 ′ is welded as an annular welded portion w 1 vertically to the low wall j.
A front end portion of a rear member 27 that constitutes a rear portion of the side member 1 is fitted to the side member connecting portion 25. At this time, a through hole h1 for fitting the rear pipe nut is formed in the rear member 27 vertically, and the upper hole h1 is a welding hole having an edge facing the outer peripheral edge of the upper end of the rear pipe nut 28 'in advance. It is formed.
As a result, as shown in FIG. 4, the upper end of the rear pipe nut 28 ′ and the welding hole of the rear member 27 are welded as an annular welded portion w 2, and the coupling rigidity between the rear pipe nut 28 ′ and the rear portion of the side member 1. Is secured. Here, the rear bolt fastening portion D2 is formed by a rear pipe nut 28 'and a downward opening edge of the rear pipe nut 28' of the low wall j having an L-shaped cross section.

図６、７に示すように、後ボルト締結部Ｄ２の開口縁は下向きの水平面を成し、ここにサスクロスメンバ９の後結合端部Ｐ２が対向配備される。サスクロスメンバ９の後結合端部Ｐ２は大径パイプ部材の上下を平面状に変形させ、その内部に補強パイプ２９が一体結合されている。この後結合端部Ｐ２が後ボルト締結部Ｄ２の開口縁に当接され、その上で、締結ボルト３１が補強パイプ２９を通して後パイプナット２８’に締結されることで、後結合端部Ｐ２が後ボルト締結部Ｄ２に一体的に結合される。
図４，５に示すように、サイドメンバ１の後部部材２７は後方に延出し、図１に示すように、リアエンドクロスメンバ３にそれぞれ溶接される。リアエンドクロスメンバ３にはフロア材４の後端及び車両の後壁をなすリアエンドパネル８が溶着され、支持されている。 As shown in FIGS. 6 and 7, the opening edge of the rear bolt fastening portion D 2 forms a downward horizontal plane, and the rear coupling end portion P 2 of the suspension cross member 9 is disposed opposite thereto. The rear coupling end portion P2 of the suspension cross member 9 deforms the upper and lower portions of the large-diameter pipe member into a flat shape, and the reinforcing pipe 29 is integrally coupled therein. The rear coupling end portion P2 is brought into contact with the opening edge of the rear bolt fastening portion D2, and the fastening bolt 31 is fastened to the rear pipe nut 28 'through the reinforcing pipe 29. It is integrally coupled to the rear bolt fastening portion D2.
4 and 5, the rear member 27 of the side member 1 extends rearward and is welded to the rear end cross member 3 as shown in FIG. A rear end panel 8 forming the rear end of the floor material 4 and the rear wall of the vehicle is welded to and supported by the rear end cross member 3.

上述のところにおいて後部車体の左側部材を主に説明したが、後部車体の右側部材は左側部材に対して左右対称に形成されることより、ここでは重複説明を略す。
このような後部車体構造を採る車両がその走行時に後方からの衝撃荷重を受けたとする。
この場合、車両の後壁をなすリアエンドパネル８やフロア材４の後端及びリアエンドクロスメンバ３に衝撃荷重が加わる。リアエンドクロスメンバ３は左右のサイドメンバ１の後部部材２７に衝撃荷重を伝え、更に、各後部部材２７と一体のサイドメンバ連結部２５(図３参照)を介して左右のインナロア２４に伝達される。 Although the left side member of the rear vehicle body has been mainly described above, the right side member of the rear vehicle body is formed to be bilaterally symmetrical with respect to the left side member.
It is assumed that a vehicle having such a rear body structure receives an impact load from the rear during traveling.
In this case, an impact load is applied to the rear end panel 8 and the rear end of the floor member 4 and the rear end cross member 3 that form the rear wall of the vehicle. The rear end cross member 3 transmits an impact load to the rear members 27 of the left and right side members 1, and is further transmitted to the left and right inner lowers 24 through side member connecting portions 25 (see FIG. 3) integral with the rear members 27. .

左右のインナロア２４はこれに結合されるサスクロスメンバ９および後席クロスメンバ２に衝撃荷重を分散吸収させる。
この際、衝撃荷重の入力部に近い、サスクロスメンバ９の左右それぞれの前後結合端部Ｐ１，Ｐ２はダイカスト製の左右のインナロア２４の前後ボルト締結部Ｄ１，Ｄ２の前後パイプナット２８，２８’に締結ボルト３１で締結され、確実に一体結合されている。
図１の車体の後部構造によれば、インナロア２４の一部として前後ボルト締結部Ｄ１，Ｄ２が形成される。このため、確実に左右のインナロア２４よりサスクロスメンバ９の左右の前後結合端部Ｐ１，Ｐ２に衝撃荷重が伝達される。この際、サスクロスメンバ９は左右のサスペンション構成部材を複数連結しており、荷重分散機能に優れるので、衝撃荷重を確実に分散吸収できる。
なお、一部の衝撃荷重は後席クロスメンバ２に分散吸収されるが、その部位の変形は十分に抑制される。 The left and right inner lowers 24 cause the suspension cross member 9 and the rear seat cross member 2 coupled thereto to disperse and absorb the impact load.
At this time, the front and rear connecting ends P1 and P2 of the left and right inner ends of the suspension cross member 9 near the impact load input portion are the front and rear pipe nuts 28 and 28 'of the front and rear bolt fastening portions D1 and D2 of the left and right inner lowers 24 made of die casting. Are fastened by fastening bolts 31 and are securely coupled together.
According to the rear structure of the vehicle body in FIG. 1, the front and rear bolt fastening portions D 1 and D 2 are formed as a part of the inner lower 24. For this reason, the impact load is reliably transmitted from the left and right inner lowers 24 to the left and right front and rear coupling ends P1, P2 of the suspension cross member 9. At this time, the suspension member 9 has a plurality of left and right suspension components connected to each other, and has an excellent load distribution function, so that an impact load can be reliably dispersed and absorbed.
A part of the impact load is dispersed and absorbed by the rear seat cross member 2, but the deformation of the portion is sufficiently suppressed.

このように、インナ部材であるインナロア２４は、リアピラインナ下壁部２１とサイドメンバ前部ａと２つのボルト締結部Ｄ１，Ｄ２とを一体的に有するようダイカスト成形されている。このため、ダイカスト製のインナ部材であるインナロア２４の一部としてインナロア２４の一部として形成される前後ボルト締結部Ｄ１，Ｄ２がパイプナット２８，２８’を一体的に供えるので、クロスメンバ９のボルト３１による締結作業性が向上し、しかも、衝撃荷重をインナロア２４よりサスクロスメンバ９に確実に伝達できる。 Thus, the inner lower 24 that is an inner member is die-cast so as to integrally include the rear pillar lower wall portion 21, the side member front portion a, and the two bolt fastening portions D1, D2. Therefore, the front and rear bolt fastening portions D1 and D2 formed as a part of the inner lower 24 as a part of the inner lower 24 that is a die-cast inner member integrally provide the pipe nuts 28 and 28 '. Fastening workability by the bolt 31 is improved, and an impact load can be reliably transmitted from the inner lower 24 to the suspension cross member 9.

更に、インナ部材であるインナロア２４にはサイドメンバ連結部２５の前方側にサイドメンバ前部ａが一体結合される構成を採るので、後方からの衝撃荷重の入力部に近い位置にあるサスクロスメンバ９が左右のインナロア２４より衝撃荷重を確実に受けて分散吸収できる。このため、サスクロスメンバ９より衝撃荷重の入力部に対して遠い後席クロスメンバ２やそれに結合された後席隔壁５側への衝撃荷重の入力量を十分に低減できる。これにより、後席隔壁５側の変形、即ち、車室変形を抑制でき、乗員の安全性を確保できる。 Further, since the inner member 24, which is an inner member, has a structure in which the side member front portion a is integrally coupled to the front side of the side member connecting portion 25, the suspension cross member located near the input portion of the impact load from the rear side. 9 is able to reliably absorb and absorb the impact load from the left and right inner lowers 24. For this reason, the input amount of the impact load to the rear seat cross member 2 which is farther from the suspension cross member 9 than the impact load input portion and the rear seat partition wall 5 connected thereto can be sufficiently reduced. Thereby, the deformation | transformation by the side of the rear-seat partition wall 5, ie, a compartment deformation, can be suppressed, and a passenger | crew's safety | security can be ensured.

更に、図１の車体の後部構造によれば、サイドメンバ連結部２５の低壁ｊに溶接されたパイプナット２８’にサイドメンバ１の後部部材２７が嵌合され、更にパイプナットの上端が後部部材２７に容易に確実に溶接することができ、溶接作業性が向上する。 Further, according to the rear structure of the vehicle body in FIG. 1, the rear member 27 of the side member 1 is fitted to the pipe nut 28 ′ welded to the low wall j of the side member connecting portion 25, and the upper end of the pipe nut is the rear portion. The member 27 can be easily and reliably welded, and the welding workability is improved.

更に、図１の車体の後部構造によれば、リアピラ６のインナ部材であるインナロア２４にサスクロスメンバ９が締結されるので、インナ部材がリアサスペンションの支持部材として有効利用でき、リアサスペンションの装着性が向上する。 Further, according to the rear structure of the vehicle body in FIG. 1, since the suspension cross member 9 is fastened to the inner lower 24 that is the inner member of the rear pillar 6, the inner member can be effectively used as a support member for the rear suspension, and the rear suspension is mounted. Improves.

本発明の一実施形態としての車体の後部構造の要部概略平面図である。It is a principal part schematic plan view of the rear part structure of the vehicle body as one Embodiment of this invention. 図１の車体の後部構造の要部概略側面図である。It is a principal part schematic side view of the rear part structure of the vehicle body of FIG. 図１の車体の後部構造におけるインナロアの拡大斜視図で、後部部材が無い場合である。FIG. 2 is an enlarged perspective view of an inner lower in the rear structure of the vehicle body in FIG. 1, in which there is no rear member. 図１の車体の後部構造におけるインナロアの拡大斜視図で、後部部材が取付けられた場合である。FIG. 2 is an enlarged perspective view of an inner lower in the rear structure of the vehicle body of FIG. 1, wherein a rear member is attached. 図１の車体の後部構造におけるインナロアの他方向からの拡大斜視図で、後部部材が取付けられた場合である。It is an enlarged perspective view from the other direction of the inner lower in the rear part structure of the vehicle body of FIG. 1, and is a case where a rear member is attached. 図１の車体の後部構造における低部からの拡大部分切欠斜視図である。FIG. 2 is an enlarged partial cutaway perspective view from a lower portion in the rear structure of the vehicle body of FIG. 1. 図６のＥ−Ｅ線断面図である。It is the EE sectional view taken on the line of FIG. 従来の車体の後部構造の要部切欠斜視図である。It is a principal part notch perspective view of the rear part structure of the conventional vehicle body. 図８の要部の断面図で、（ａ）は図８のＡ−Ａ線断面図、（ｂ）は図８のＢ−Ｂ線断面図である。FIG. 9 is a cross-sectional view of the main part of FIG. 8, where (a) is a cross-sectional view taken along line AA in FIG. 8, and (b) is a cross-sectional view taken along line BB in FIG.

符号の説明Explanation of symbols

１サイドメンバ
２リアフェンダ
６リアピラ
９サスクロスメンバ（クロスメンバ）
２１リアピラインナ下壁部
２４インナロア（リアピラのインナ部材）
２５サイドメンバ連結部
２７後部部材
３１締結ボルト
ａ前部
ｂ後部
Ｄ１，Ｄ２ボルト締結部
１１リアサスペンション
Ｐ１前結合端部
Ｐ２後結合端部
Ｘ前後方向
Ｙ車幅方向 1 Side member 2 Rear fender 6 Rear pillar 9 Suspension cross member (cross member)
21 Rear Pillar Lower Wall 24 Inner Lower (Rear Pillar Inner Member)
25 Side member connecting portion 27 Rear member 31 Fastening bolt a Front portion b Rear portion D1, D2 Bolt fastening portion 11 Rear suspension P1 Front coupling end portion P2 Rear coupling end portion X Front-rear direction Y Vehicle width direction

Claims

車室後部の左右にリアピラがそれぞれ配備された車体の後部構造において、
前記各リアピラのインナ部材が、車室後側部の剛性を確保するリアピラインナ下壁部と、車両前後方向に長いサイドメンバの前部と、同前部に端部が対向配備されたクロスメンバを締結する前後２つのボルト締結部とを一体的に有するようダイカスト成形され、
前記インナ部材には前記サイドメンバ前部の後端より後方に向けて連続して、前記サイドメンバの後部を成す後部部材の先端部が嵌合されるサイドメンバ連結部が延設され、
前記サイドメンバ連結部に前記前後２つのボルト締結部のうち少なくとも後ボルト締結部が形成されたことを特徴とする車体の後部構造。 In the rear structure of the vehicle body where the rear pillars are arranged on the left and right of the rear part of the passenger compartment,
The inner member of each of the rear pillars includes a rear pillar lower wall portion that secures rigidity of the rear side portion of the passenger compartment, a front portion of a side member that is long in the vehicle front-rear direction, and a cross member that has an end portion opposed to the front portion. Die-casting so as to integrally have two bolt fastening parts before and after fastening,
The inner member is continuously extended rearward from the rear end of the side member front portion, and a side member connecting portion to which a front end portion of the rear member constituting the rear portion of the side member is fitted is extended.
A rear structure of a vehicle body, wherein at least a rear bolt fastening portion of the two front and rear bolt fastening portions is formed on the side member connecting portion.

請求項１記載の車体の後部構造において、
前記インナ部材の前記サイドメンバ前部には前記前後２つのボルト締結部のうちの前ボルト締結部が一体形成されたことを特徴とする車体の後部構造。 In the rear structure of the vehicle body according to claim 1,
A rear structure of a vehicle body, wherein a front bolt fastening portion of the two front and rear bolt fastening portions is integrally formed at the front side portion of the inner member.

請求項１又は２記載の車体の後部構造において、
前記前後２つのボルト締結部には前記クロスメンバを締結する締結ボルトが螺着されるパイプナットが形成されることを特徴とする車体の後部構造。 In the rear structure of the vehicle body according to claim 1 or 2,
A rear structure of a vehicle body, wherein a pipe nut to which a fastening bolt for fastening the cross member is screwed is formed at the two front and rear bolt fastening portions.

請求項３記載の車体の後部構造において、
前記後ボルト締結部のパイプナットはその下部が前記サイドメンバ連結部の低壁に溶接され、上端はパイプナットに嵌着された前記後部部材の溶接穴に溶接されたことを特徴とする車体の後部構造。 In the rear structure of the vehicle body according to claim 3,
The lower part of the pipe nut of the rear bolt fastening portion is welded to the low wall of the side member connecting portion, and the upper end is welded to the welding hole of the rear member fitted to the pipe nut. Rear structure.

請求項１乃至４のいずれか１つの車体の後部構造において、
前記クロスメンバはリアサスペンション構成部材を支持するサスクロスメンバであることを特徴とする車体の後部構造。 In the rear structure of the vehicle body according to any one of claims 1 to 4,
A rear structure of a vehicle body, wherein the cross member is a suspension cross member that supports a rear suspension component.