JP6452044B2 - Rear body structure of automobile - Google Patents

Rear body structure of automobile Download PDF

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Publication number
JP6452044B2
JP6452044B2 JP2015076108A JP2015076108A JP6452044B2 JP 6452044 B2 JP6452044 B2 JP 6452044B2 JP 2015076108 A JP2015076108 A JP 2015076108A JP 2015076108 A JP2015076108 A JP 2015076108A JP 6452044 B2 JP6452044 B2 JP 6452044B2
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rear side
cross member
floor panel
reinforcement
body structure
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JP2016196207A (en
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喜久男 平野
喜久男 平野
丈大 鈴木
丈大 鈴木
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Suzuki Motor Co Ltd
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Suzuki Motor Co Ltd
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Priority to JP2015076108A priority Critical patent/JP6452044B2/en
Priority to DE102016103082.1A priority patent/DE102016103082A1/en
Priority to CN201610108402.2A priority patent/CN106043458B/en
Publication of JP2016196207A publication Critical patent/JP2016196207A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D25/00—Superstructure or monocoque structure sub-units; Parts or details thereof not otherwise provided for
    • B62D25/20—Floors or bottom sub-units
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D25/00—Superstructure or monocoque structure sub-units; Parts or details thereof not otherwise provided for
    • B62D25/20—Floors or bottom sub-units
    • B62D25/2009—Floors or bottom sub-units in connection with other superstructure subunits
    • B62D25/2027—Floors or bottom sub-units in connection with other superstructure subunits the subunits being rear structures
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K1/00—Arrangement or mounting of electrical propulsion units
    • B60K1/04—Arrangement or mounting of electrical propulsion units of the electric storage means for propulsion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
    • B60K15/03—Fuel tanks
    • B60K15/063—Arrangement of tanks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
    • B60K15/03—Fuel tanks
    • B60K15/063—Arrangement of tanks
    • B60K15/067—Mounting of tanks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D25/00—Superstructure or monocoque structure sub-units; Parts or details thereof not otherwise provided for
    • B62D25/08—Front or rear portions
    • B62D25/087—Luggage compartments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K1/00—Arrangement or mounting of electrical propulsion units
    • B60K1/04—Arrangement or mounting of electrical propulsion units of the electric storage means for propulsion
    • B60K2001/0405—Arrangement or mounting of electrical propulsion units of the electric storage means for propulsion characterised by their position
    • B60K2001/0416—Arrangement in the rear part of the vehicle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
    • B60K15/03—Fuel tanks
    • B60K15/063—Arrangement of tanks
    • B60K2015/0638—Arrangement of tanks the fuel tank is arranged in the rear of the vehicle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2306/00—Other features of vehicle sub-units
    • B60Y2306/01—Reducing damages in case of crash, e.g. by improving battery protection

Description

本発明は、車体後部に加わる過大な衝撃に対して、燃料タンクと、駆動用蓄電池などの車体搭載部品の保護を図り得る自動車の後部車体構造に関する。   The present invention relates to a rear vehicle body structure capable of protecting a vehicle tank mounted part such as a fuel tank and a drive storage battery against excessive impact applied to the rear part of the vehicle body.

従来、特許文献１に開示されているように、車両前後方向に延びた一対のリヤサイドメンバと、一対のリヤサイドメンバを車両幅方向で繋げたリヤクロスメンバと、リヤクロスメンバの前部に燃料タンクが配置された車両において、燃料タンク後方にノッチなどの低剛性部を設け、後面衝突された場合に、この低剛性部を起点として車両上方側に屈曲させて、衝撃荷重が直接、燃料タンクに加わるのを回避する技術が知られている。   Conventionally, as disclosed in Patent Document 1, a pair of rear side members extending in the vehicle front-rear direction, a rear cross member connecting the pair of rear side members in the vehicle width direction, and a fuel tank at the front of the rear cross member In the vehicle where is placed, a low-rigidity part such as a notch is provided at the rear of the fuel tank, and when a rear collision occurs, the low-rigidity part is bent to the upper side of the vehicle, and the impact load is directly applied to the fuel tank. Techniques for avoiding joining are known.

特許第４５３４７７２号公報Japanese Patent No. 4534772 特開２０１２−８１８７７号公報JP 2012-81877 A 特開２００５−１７００７６号公報Japanese Patent Laid-Open No. 2005-170076 特開２０１３−３２１１７号公報JP 2013-32117 A

しかしながら、ハイブリッド車両などでは、燃料タンクの後方に駆動用蓄電池の搭載部が設けられている場合があり、車体後部からの衝撃により、車体後部側が押し潰されると駆動用蓄電池が燃料タンクに接触し、燃料タンクおよび駆動用蓄電池の損傷を招く恐れがある。   However, in a hybrid vehicle or the like, there is a case where a driving storage battery mounting portion is provided behind the fuel tank, and when the rear side of the vehicle body is crushed by an impact from the rear portion of the vehicle body, the driving storage battery contacts the fuel tank. In addition, the fuel tank and the drive storage battery may be damaged.

本発明は、後部車体を構成するリヤサイドメンバの途中に相対的な強度差を設け、車体後部から衝撃荷重が加わった際にリヤサイドメンバの強度の低い個所から燃料タンクを避ける方向にリヤサイドメンバの変形を誘発し、燃料タンク等に損傷が及ぶことを防止する自動車の後部車体構造を提供することを目的とする。   The present invention provides a relative strength difference in the middle of the rear side member constituting the rear body, and when the impact load is applied from the rear of the vehicle body, the rear side member is deformed in a direction to avoid the fuel tank from the low strength of the rear side member. An object of the present invention is to provide a rear body structure of a vehicle that induces fuel and prevents damage to a fuel tank or the like.

本発明は、上記課題を解決するため、左右一対のリヤサイドメンバと、これらリヤサイドメンバ相互間を連結したクロスメンバと、このクロスメンバの前方に配設された燃料タンクと、前記クロスメンバの後方に配設された車体搭載部品と、この車体搭載部品の本体部の前端から後端までを含むように前記左右一対のリヤサイドメンバに配設された補強部材とを備え、該補強部材の前端が、前記リヤサイドメンバと前記クロスメンバの連結部の後端位置よりも後方に来るように配置したことにある。
前記補強部材は、前記リヤサイドメンバの内側に配設されるとともに、サスペンション部品を支持する前部側のブレースと、前記リヤサイドメンバの内壁に沿って配設された後部側のリンフォースメントで構成されていることにある。
前記ブレース後端部と、前記リンフォースメント前端部は互いに接合されていることにある。
前記補強部材は、前部が前記リヤサイドメンバ相互を連結する第２クロスメンバで、後部が前記リヤサイドメンバの内壁に沿うリンフォースメントで構成されることにある。
前記リヤサイドメンバは、前記補強部材後端よりも後方に延在することにある。 In order to solve the above problems, the present invention provides a pair of left and right rear side members, a cross member connecting the rear side members, a fuel tank disposed in front of the cross member, and behind the cross member. A vehicle-mounted component that is disposed, and a reinforcing member that is disposed on the pair of left and right rear side members so as to include from the front end to the rear end of the body portion of the vehicle-mounted component, and the front end of the reinforcing member is The rear side member and the cross member are arranged so as to come rearward from the rear end position of the connecting portion.
The reinforcing member is disposed inside the rear side member, and includes a front brace for supporting a suspension component and a rear reinforcement disposed along the inner wall of the rear side member. There is in being.
The rear end portion of the brace and the front end portion of the reinforcement are joined together.
The reinforcing member is configured such that a front portion is a second cross member for connecting the rear side members to each other, and a rear portion is a reinforcement along the inner wall of the rear side member.
The rear side member extends rearward from the rear end of the reinforcing member.

本発明の効果は以下の通りである。
補強部材の前端が、前記リヤサイドメンバと前記クロスメンバの連結部の後端位置よりも後方に来るように配置したので、燃料タンクと車載搭載部品が車体を介して、直線的に圧縮され燃料タンクおよび車載搭載部品を損傷させる不具合を防止することができる。前記補強部材は、リンフォースメントの前端部にサスペンション部品を支持するブレースを配置しているので、補強部材前端部の剛性を向上することができる。また、前記ブレース後端部と、前記リンフォースメント前端部を互いに接合することで、より剛性の向上を図ることができる。さらに、補強部材を、前部がリヤサイドメンバ相互を連結する第２クロスメンバで、後部がリヤサイドメンバの内壁に沿うリンフォースメントで構成することで、剛性の向上を図ることができる。また、リヤサイドメンバを、前記補強部材後端よりも後方に延在することで、補強部材が設けられていないリヤサイドメンバの後端部を先に変形させることにより衝撃を吸収することができる。 The effects of the present invention are as follows.
Since the front end of the reinforcing member is disposed behind the rear end position of the connecting portion between the rear side member and the cross member, the fuel tank and the vehicle-mounted component are linearly compressed via the vehicle body, and the fuel tank In addition, it is possible to prevent problems that damage on-vehicle components. Since the reinforcing member has a brace that supports the suspension component at the front end of the reinforcement, the rigidity of the front end of the reinforcing member can be improved. Further, the rigidity can be further improved by joining the rear end portion of the brace and the front end portion of the reinforcement together. Furthermore, the reinforcement can be improved by configuring the reinforcing member with a second cross member having a front portion connecting the rear side members to each other and a reinforcement having a rear portion along the inner wall of the rear side member. Further, by extending the rear side member rearward from the rear end of the reinforcing member, it is possible to absorb an impact by deforming the rear end portion of the rear side member not provided with the reinforcing member first.

本発明の実施の形態による自動車の後部車体構造を示しリヤフロアパネルの後部パネルを取り除いて示す概念図である。1 is a conceptual diagram showing a rear body structure of an automobile according to an embodiment of the present invention with a rear panel of the rear floor panel removed. （ａ）は、図１のリヤフロアパネルに設置された駆動用蓄電池を示す斜め上方から見た斜視図、（ｂ）は、図２（ａ）の側面図、（ｃ）は、図２（ｂ）の斜め下方から見た斜視図である。(A) is the perspective view which looked at the storage battery for a drive installed in the rear floor panel of FIG. 1 from diagonally upward, (b) is a side view of FIG. 2 (a), (c) is FIG. It is the perspective view seen from the slanting lower part. 図２（ａ）のＡ−Ａ線断面図である。It is the sectional view on the AA line of Fig.2 (a). 補強部材を示す拡大図である。It is an enlarged view which shows a reinforcement member. 車体後方からの衝撃に対する変形を説明する概念断面図である。It is a conceptual sectional view explaining the deformation to the impact from the rear of the vehicle body. 本発明の他の実施の形態であるリヤサイドメンバを示す概念図である。It is a conceptual diagram which shows the rear side member which is other embodiment of this invention. 本発明の変形例を示す概念図である。It is a conceptual diagram which shows the modification of this invention.

以下、本発明の実施の形態を、図面を参照しながら詳細に説明する。
図１ないし図３は、ハイブリッド自動車の後部車体構造を示したもので、図１はリヤフロアパネルの後部パネルを取り除いて示している。図２（ａ）（ｂ）（ｃ）は、リヤフロアパネルを配置した後部車体構造を示しており、（ａ）が斜め上方から、（ｂ）が側面から、（ｃ）が斜め下方から見た図である。図３は車体のクロスメンバを挟んで前後に取り付けられた燃料タンクと駆動用蓄電池の取り付け位置を示したものである。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 to 3 show a rear body structure of a hybrid vehicle, and FIG. 1 shows the rear floor panel with the rear panel removed. FIGS. 2A, 2B, and 2C show a rear vehicle body structure in which a rear floor panel is disposed. FIG. 2A is viewed from obliquely above, FIG. 2B is viewed from a side, and FIG. FIG. FIG. 3 shows the attachment positions of the fuel tank and the drive storage battery attached to the front and rear of the vehicle cross member.

ハイブリッド自動車の後部車体１は、フロント側のメインフロアパネルに続くリヤ側のリヤフロアパネル２が設けられている。このリヤフロアパネル２は、メインフロアパネルより一段上方に変位させてリヤシート下面側を構成する前部フロアパネル３と、リヤシート後方部、所謂、トランクフロアパネル部を構成する後部フロアパネル４とで構成されている。
このリヤフロアパネル２の下面の左右両側には、車体前後方向に沿って、横断面が略Ｕ字状の一対のリヤサイドメンバ５が設けられている。これらリヤサイドメンバ５は、鋼板を横断面が所謂、略逆ハット形断面に形成し、この逆ハット形断面の両側フランジ部を前記リヤフロアパネル２の下面に接合して閉じ断面を構成するように組み付けられている。また、これらリヤフロアパネル２の前部フロアパネル３は、前端部に対して後方部分が一段高くなるように傾斜部分を設けて形成されており、このほぼ高くなった変位部分の前端部相互間を車幅方向に配設された帯状のリヤクロスメンバ６で連結して、補強している。このリヤクロスメンバ６は、リヤフロアパネル２の前部フロアパネル３と後部フロアパネル４の接合部３ａ，４ａの個所に、後部フロアパネル４の車幅方向に溶接により接合されて後部フロアパネル４との間に閉じ断面Ｃが形成されている。 The rear vehicle body 1 of the hybrid vehicle is provided with a rear side rear floor panel 2 following the front side main floor panel. The rear floor panel 2 includes a front floor panel 3 that is displaced one step above the main floor panel to form the lower surface of the rear seat, and a rear floor panel 4 that forms a rear portion of the rear seat, that is, a so-called trunk floor panel. ing.
On the left and right sides of the lower surface of the rear floor panel 2, a pair of rear side members 5 having a substantially U-shaped cross section are provided along the longitudinal direction of the vehicle body. These rear side members 5 are assembled so that a steel plate is formed in a so-called substantially inverted hat-shaped cross section, and both flange portions of the inverted hat-shaped cross section are joined to the lower surface of the rear floor panel 2 to form a closed cross section. It has been. Further, the front floor panel 3 of these rear floor panels 2 is formed with an inclined portion so that the rear portion is one step higher than the front end portion, and between the front end portions of the substantially increased displacement portion. The belt-shaped rear cross member 6 arranged in the vehicle width direction is connected and reinforced. The rear cross member 6 is joined to the rear floor panel 4 by welding in the vehicle width direction of the rear floor panel 4 at the joint portions 3a and 4a of the front floor panel 3 and the rear floor panel 4 of the rear floor panel 2. A closed cross section C is formed between the two.

このリヤクロスメンバ６の前方側で、前記前部フロアパネル３の下面側空間部３ｂには、燃料タンク７が配設されている。この燃料タンク７のインレットパイプ７ａは車体後方側に配置され、前記リヤクロスメンバ６の下側に設けられている。前記リヤクロスメンバ６の後方側で、リヤフロアパネル２の後部フロアパネル４の上面側には、駆動用蓄電池の本体部８が配置されている。後部フロアパネル４の上面側には凹部４ｂが形成されており、この凹部４ｂ内に前記駆動用蓄電池の本体部８が配置されて、後部フロアパネル４の前部縦壁面４ｃを挟んで前記燃料タンク７の後方位置に前記駆動用蓄電池の本体部８の設置個所が設けられている。   On the front side of the rear cross member 6, a fuel tank 7 is disposed in the lower surface side space 3 b of the front floor panel 3. An inlet pipe 7 a of the fuel tank 7 is disposed on the rear side of the vehicle body and is provided on the lower side of the rear cross member 6. On the rear side of the rear cross member 6 and on the upper surface side of the rear floor panel 4 of the rear floor panel 2, a main body 8 of a storage battery for driving is disposed. A recess 4 b is formed on the upper surface side of the rear floor panel 4, and the main body 8 of the drive storage battery is disposed in the recess 4 b, and the fuel is sandwiched between the front vertical wall surface 4 c of the rear floor panel 4. An installation location of the main body 8 of the driving storage battery is provided at a rear position of the tank 7.

前記リヤサイドメンバ５の内側には、図４に示すようにリヤクロスメンバ６の連結部の後端位置よりも後方に来るように、補強部材９の前端が配置されている。補強部材９は、前記駆動用蓄電池８の車体前後方向の長さＬと略同一の長さを有しており、横断面が略Ｕ字状断面のリンフォースメント１０と、このリンフォースメント１０の前端部に配置又は接合されたブレース１１とで構成されている。ブレース１１は、リヤサイドメンバ５の内側に前記リヤクロスメンバ６の後方位置で、リヤサスペンション取付け部１２に対応する位置に取り付けられている。ブレース１１は、車体前後方向の断面が上面１１ａと前後縦壁面１１ｂとでπ形状に形成されている。前記前後縦壁面１１ｂの下端部には、リヤサイドメンバ５の底面５ａに沿って、それぞれ前後方向に延びるフランジ部１１ｂ１，１１ｂ２が設けられ、前記前後縦壁面１１ｂの車幅方向両側部には、リヤサイドメンバ５の内側内壁面５ｂに沿って延びるフランジ部１１ｂ３，１１ｂ４が設けられている。このブレース上面１１ａの車幅方向の上端には、上方に向けて折り曲げられたフランジ部１１ａ１が形成されている。ブレース１１は、車体後方側のフランジ部１１ｂ２を介してリンフォースメント１０の前端部の内側底面１０ａに接合され、車体後方側のフランジ部１１ｂ４を介してリンフォースメント１０の前端部の内側側壁面１０ｂに接合されている。また、ブレース１１は、車体前方側のフランジ部１１ｂ１を介してリヤサイドメンバ５の底面５ａに接合され、車体前方側のフランジ部１１ｂ３を介してリヤサイドメンバ５の内側内壁面５ｂに接合されている。ブレース１１は、ブレース上面１１ａのフランジ部１１ａ１を介してリヤサイドメンバ５の内側内壁面５ｂに接合されている。さらに、ブレース１１は上方のフランジ部１１ａ１を前記リヤサイドメンバ５の内側内壁面５ｂに接合されている。 As shown in FIG. 4, the front end of the reinforcing member 9 is disposed inside the rear side member 5 so as to be behind the rear end position of the connecting portion of the rear cross member 6. The reinforcing member 9 has a length approximately the same as the length L of the driving storage battery 8 in the longitudinal direction of the vehicle body. The reinforcement 10 has a substantially U-shaped cross section, and the reinforcement 10 It is comprised with the brace 11 arrange | positioned or joined to the front-end part. The brace 11 is attached to the inside of the rear side member 5 at a position corresponding to the rear suspension attachment portion 12 at a position behind the rear cross member 6. The cross section of the brace 11 in the longitudinal direction of the vehicle body is formed in a π shape with the upper surface 11a and the longitudinal longitudinal wall surface 11b. Flange portions 11b 1 and 11b 2 extending in the front-rear direction along the bottom surface 5a of the rear side member 5 are respectively provided at the lower end portion of the front-rear vertical wall surface 11b. Further, flange portions 11b 3 and 11b 4 extending along the inner inner wall surface 5b of the rear side member 5 are provided. A flange portion 11a 1 bent upward is formed at the upper end of the brace upper surface 11a in the vehicle width direction. Brace 11 is joined to the inner bottom surface 10a of the front end portion of the reinforcements 10 via the flange portion 11b 2 of the vehicle body rear side, the inner side of the front end portion of the reinforcements 10 via the flange portion 11b 4 of the vehicle body rear side It is joined to the side wall surface 10b. Further, brace 11 is joined to the bottom surface 5a of the rear side member 5 through the flange portion 11b 1 of the vehicle body front side, is joined to the inside inner wall surface 5b of the rear side member 5 through the flange portion 11b 3 of the vehicle body front side Yes. Brace 11 is joined to the inside inner wall surface 5b of the rear side member 5 through the flange portion 11a 1 of the brace upper surface 11a. Further, the brace 11 has an upper flange portion 11 a 1 joined to the inner inner wall surface 5 b of the rear side member 5.

前記リヤサイドメンバ５は、図１に示すように補強部材９の前端部とリヤクロスメンバ６の接合部との間に、補強部が無い強度の弱い部分、所謂、脆弱部Ｆが形成され、この脆弱部Ｆを介して上方に屈曲しやすく構成されている。このように、前記クロスメンバ６の後方側の前記リヤサイドメンバ５の長手方向に補強部材９を設け、前記クロスメンバ６の連結部と前記補強部材９の配設部相互間に相対的な強度差を設けて脆弱部Ｆを発生させるように前記リヤサイドメンバ５を補強している。   As shown in FIG. 1, the rear side member 5 has a weak portion, that is, a so-called fragile portion F without a reinforcing portion, formed between the front end portion of the reinforcing member 9 and the joint portion of the rear cross member 6. It is configured to be easily bent upward via the fragile portion F. Thus, the reinforcing member 9 is provided in the longitudinal direction of the rear side member 5 on the rear side of the cross member 6, and a relative strength difference is provided between the connecting portion of the cross member 6 and the arrangement portion of the reinforcing member 9. The rear side member 5 is reinforced so that the fragile portion F is generated.

次に上記構成による実施の形態の作用を説明する。
図５に示すように走行時に後方から図示矢視Ｘ方向の過大な衝撃が後部車体に加わると、リヤサイドメンバ５は、補強部材９の前端部と、リヤクロスメンバ６の接合部との間に脆弱部Ｆが形成されていることから、この脆弱部Ｆを中心に図示矢視Ｙ方向のように上方に屈曲し、リヤサイドメンバ５は、前方に向けて山形、すなわちＬ字を後方に回転させた形状に屈曲する。
リヤサイドメンバ５の屈曲とともにリヤフロアパネル２も屈曲し、駆動用蓄電池の本体部８も燃料タンク７に近づく、図示矢視Ｚ方向に傾斜しながら前方側に移動する。図５に示すようにリヤフロアパネル２はリヤクロスメンバ６の接合部の後方側で屈曲し、燃料タンク７に近づいていくことがわかる。この変形により衝撃を吸収しつつ、リヤサイドメンバ５を補強するリヤクロスメンバ６とリンフォースメント１０の効果により燃料タンク７と駆動用蓄電池の本体部８が存在する範囲のリヤサイドメンバ５の変形を抑制する。こうして、燃料タンク７はリヤフロアパネル２における前部フロアパネル３の下面側空間部３ｂで保護されているので、駆動用蓄電池の本体部８が前部縦壁面４ｃを介して燃料タンク７に接触する不具合を防止することができる。補強部材９は、駆動用蓄電池の本体部８の車体前後方向の長さＬと略同一の長さに形成されているので、リンフォースメント１０の後端が駆動用蓄電池の本体部８の範囲までとなり、それより後方のリヤサイドメンバ５は変形可能となることから空間を確保しつつ、駆動用蓄電池の本体部８を守りながら、効率的にエネルギーの吸収を図ることができる。また、リヤサイドメンバ５が山形に屈曲した際に、リヤフロアパネル２が撓んで燃料タンク７のインレットパイプ７ａが存在する付近まで達する恐れがあるが、リヤクロスメンバ６がインレットパイプ７ａの上方のリヤフロアパネル２に配置されており剛性を確保することができる。さらに、リヤサイドメンバ５の脆弱部Ｆをリヤクロスメンバ６よりも後方に配置させることにより、リヤフロアパネル２の変形がインレットパイプ７ａ付近まで及ばないように抑制することができる。 Next, the operation of the embodiment having the above configuration will be described.
As shown in FIG. 5, when an excessive impact in the direction indicated by the arrow X is applied to the rear vehicle body from behind during traveling, the rear side member 5 is placed between the front end portion of the reinforcing member 9 and the joint portion of the rear cross member 6. Since the fragile portion F is formed, the rear side member 5 is bent upward as indicated by the arrow Y in the figure with the fragile portion F as the center, and the rear side member 5 rotates the chevron, that is, the L-shape backward. Bends into a different shape.
As the rear side member 5 is bent, the rear floor panel 2 is also bent, and the main body portion 8 of the driving storage battery approaches the fuel tank 7 and moves forward while being inclined in the Z direction shown in the figure. As shown in FIG. 5, it can be seen that the rear floor panel 2 bends behind the joint portion of the rear cross member 6 and approaches the fuel tank 7. While the shock is absorbed by this deformation, the rear cross member 6 that reinforces the rear side member 5 and the reinforcement 10 suppress the deformation of the rear side member 5 in the range where the fuel tank 7 and the main body 8 of the drive storage battery exist. To do. Thus, since the fuel tank 7 is protected by the lower surface side space 3b of the front floor panel 3 in the rear floor panel 2, the main body 8 of the drive storage battery contacts the fuel tank 7 through the front vertical wall surface 4c. Problems can be prevented. Since the reinforcing member 9 is formed to have a length substantially the same as the length L in the longitudinal direction of the vehicle body of the main body 8 of the driving storage battery, the rear end of the reinforcement 10 is within the range of the main body 8 of the driving storage battery. Since the rear side member 5 behind it can be deformed, energy can be efficiently absorbed while securing a space and protecting the main body 8 of the drive storage battery. Further, when the rear side member 5 is bent in a mountain shape, the rear floor panel 2 may bend and reach the vicinity of the fuel pipe 7 where the inlet pipe 7a exists. 2 is secured. Furthermore, by arranging the fragile portion F of the rear side member 5 behind the rear cross member 6, it is possible to prevent the deformation of the rear floor panel 2 from reaching the vicinity of the inlet pipe 7a.

図６は、補強部材９の変形例で、この場合、ブレース１１は、リンフォースメント１０の前端部に接続せずに、例えば、リヤフロアパネル２の下面側に予め接合しておき、リヤサイドメンバ５には、リンフォースメント１０のみを組み付けて用いることもできる。これによって、リヤサイドメンバ５の作業工程を減らすことができる。また、リンフォースメント１０の厚みを厚くすることで、ブレース１１を省略し、リンフォースメント１０のみで補強部材９を構成することもできる。   FIG. 6 shows a modification of the reinforcing member 9. In this case, the brace 11 is not connected to the front end portion of the reinforcement 10, but is joined in advance to the lower surface side of the rear floor panel 2, for example. It is also possible to assemble and use only the reinforcement 10. Thereby, the work process of the rear side member 5 can be reduced. Further, by increasing the thickness of the reinforcement 10, the brace 11 can be omitted, and the reinforcement member 9 can be configured only by the reinforcement 10.

なお、本発明は、上記実施の形態のみに限定されるものではなく、例えば、駆動用蓄電池の本体部８の代わりに他の車体搭載部品を組み付ける場合にも適用することができる。また、燃料タンク７の後部位置にリヤクロスメンバ６が設けられ、このリヤクロスメンバ６の両端部を両側のリヤサイドメンバ５に結合して補強し、この結合部から間隙を設けて補強部材９をリヤサイドメンバ５に組み付ける構成であれば、他の構造の後部車体に適用することもできる。さらに、図７に示すように、リヤクロスメンバ６の後方に、第２のクロスメンバ１６をリンフォースメント１０の前端位置に連結するようにリヤサイドメンバ５に結合し、補強部材９の前端部を補強することもできる。この場合、前記補強部材９は、前部が前記リヤサイドメンバ５相互を連結する第２のクロスメンバ１６で、後部が前記リヤサイドメンバ５の内壁に沿うリンフォースメント１０で構成される。また、この場合もブレース１１を組み付けて、前部のブレース１１部分の位置に第２のクロスメンバ１６を連結してより一層、前部の剛性を向上することもできる。その他、本発明の技術的範囲を変更しない範囲内で適宜変更して実施し得ることは言うまでもない。   In addition, this invention is not limited only to the said embodiment, For example, it can apply also when assembling other vehicle body mounting components instead of the main-body part 8 of a drive storage battery. Further, a rear cross member 6 is provided at the rear position of the fuel tank 7, and both ends of the rear cross member 6 are connected to the rear side members 5 on both sides to reinforce, and a reinforcing member 9 is provided by providing a gap from the connecting portion. Any structure that can be assembled to the rear side member 5 can be applied to the rear body of another structure. Further, as shown in FIG. 7, the second cross member 16 is coupled to the rear side member 5 at the rear of the rear cross member 6 so as to be connected to the front end position of the reinforcement 10, and the front end portion of the reinforcing member 9 is attached. It can also be reinforced. In this case, the reinforcing member 9 includes a second cross member 16 having a front portion connecting the rear side members 5 to each other and a reinforcement portion 10 having a rear portion along the inner wall of the rear side member 5. Also in this case, the brace 11 can be assembled and the second cross member 16 can be connected to the position of the front brace 11 part to further improve the rigidity of the front part. In addition, it cannot be overemphasized that it can change suitably and can implement within the range which does not change the technical scope of the present invention.

１ 後部車体
２ リヤフロアパネル
３ 前部フロアパネル
３ｂ 下面側空間部
４ 後部フロアパネル
４ｂ 凹部
５ リヤサイドメンバ
６ リヤクロスメンバ（クロスメンバ）
７ 燃料タンク
８ 駆動用蓄電池の本体部
９ 補強部材
１０ リンフォースメント
１１ ブレース
１２ リヤサスペンション取付け部
１６ 第２のクロスメンバ
Ｆ 脆弱部（強度の弱い部分） DESCRIPTION OF SYMBOLS 1 Rear vehicle body 2 Rear floor panel 3 Front floor panel 3b Lower surface side space part 4 Rear floor panel 4b Recessed part 5 Rear side member 6 Rear cross member (cross member)
7 Fuel Tank 8 Drive Battery Body 9 Reinforcing Member 10 Reinforcement 11 Brace 12 Rear Suspension Mounting Portion 16 Second Cross Member F Fragile Portion (Low Strength)

Claims (5)

左右一対のリヤサイドメンバと、これらリヤサイドメンバ相互間を連結したクロスメンバと、このクロスメンバの前方に配設された燃料タンクと、前記クロスメンバの後方に配設された車体搭載部品と、この車体搭載部品の本体部の前端から後端までを含むように前記左右一対のリヤサイドメンバに配設された補強部材とを備え、該補強部材の前端が、前記リヤサイドメンバと前記クロスメンバの連結部の後端位置よりも後方に来るように配置したことを特徴とする自動車の後部車体構造。   A pair of left and right rear side members, a cross member connecting the rear side members, a fuel tank disposed in front of the cross member, a vehicle body mounting component disposed behind the cross member, and the vehicle body A reinforcing member disposed on the pair of left and right rear side members so as to include from the front end to the rear end of the main body portion of the mounted component, and the front end of the reinforcing member is a connecting portion between the rear side member and the cross member. A rear body structure of an automobile, wherein the rear body structure is arranged so as to come rearward from a rear end position. 前記補強部材は、前記リヤサイドメンバの内側に配設されるとともに、サスペンション部品を支持する前部側のブレースと、前記リヤサイドメンバの内壁に沿って配設された後部側のリンフォースメントで構成されている請求項１に記載の自動車の後部車体構造。   The reinforcing member is disposed inside the rear side member, and includes a front brace for supporting a suspension component and a rear reinforcement disposed along the inner wall of the rear side member. The rear body structure of an automobile according to claim 1. 前記ブレース後端部と、前記リンフォースメント前端部は互いに接合されている請求項２に記載の自動車の後部車体構造。   The rear body structure of an automobile according to claim 2, wherein the rear end portion of the brace and the front end portion of the reinforcement are joined to each other. 前記補強部材は、前部が前記リヤサイドメンバ相互を連結する第２クロスメンバで、後部が前記リヤサイドメンバの内壁に沿うリンフォースメントで構成される請求項１に記載の自動車の後部車体構造。   2. The rear body structure of the automobile according to claim 1, wherein the reinforcing member includes a second cross member having a front portion that couples the rear side members to each other and a rear portion having a reinforcement along an inner wall of the rear side member. 前記リヤサイドメンバは、前記補強部材後端よりも後方に延在する請求項１〜４のいずれか１項に記載の自動車の後部車体構造。   5. The rear body structure of the automobile according to claim 1, wherein the rear side member extends rearward from the rear end of the reinforcing member.
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