JP6581410B2 - Car body rear structure - Google Patents

Car body rear structure Download PDF

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Publication number
JP6581410B2
JP6581410B2 JP2015137454A JP2015137454A JP6581410B2 JP 6581410 B2 JP6581410 B2 JP 6581410B2 JP 2015137454 A JP2015137454 A JP 2015137454A JP 2015137454 A JP2015137454 A JP 2015137454A JP 6581410 B2 JP6581410 B2 JP 6581410B2
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side frame
vehicle body
vertical wall
stiffening member
mounting
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JP2017019352A (en
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智也 川村
智也 川村
喜暁 橋本
喜暁 橋本
勇司 田中
勇司 田中
泰和 沼田
泰和 沼田
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Subaru Corp
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Subaru Corp
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Description

本発明は、車体後部構造に関し、特に車体下部左右両側に沿って前後方向に延在するサイドフレームおよび補剛部材を備えた車体後部構造に関する。   The present invention relates to a vehicle body rear structure, and more particularly to a vehicle body rear structure including a side frame and a stiffening member that extend in the front-rear direction along the left and right sides of the lower portion of the vehicle body.

従来、自動車等の車両の車体後部には、フロアパネルの両側部に沿って前後方向に延在する左右のサイドフレームが設けられ、この左右のサイドフレーム間にクロスメンバが架け渡されるとともにサイドフレームの後端部がリヤスカートに連結される。左右のサイドフレームに後輪用のサスペンションが連結される。   Conventionally, left and right side frames extending in the front-rear direction along both sides of a floor panel are provided at the rear of a vehicle body such as an automobile, and a cross member is bridged between the left and right side frames. Is connected to the rear skirt. Rear wheel suspensions are connected to the left and right side frames.

このような車体構造においては、車両の走行等に伴いサスペンションからサイドフレームに繰り返し衝撃荷重が入力される。この繰り返し入力されるサスペンション荷重により車体後部に振動が発生する。この車体後部の振動を抑制する対策として左右のサイドフレームの曲げ剛性、特に上下方向の曲げ剛性を確保することが有効であることが知られている。しかし、車体重量の増加や車体構造上サイドフレームの縦断面形状を確保することが困難な場合が多い。   In such a vehicle body structure, an impact load is repeatedly input from the suspension to the side frame as the vehicle travels. Vibration is generated at the rear of the vehicle body due to the suspension load that is repeatedly input. It is known that it is effective to secure the bending rigidity of the left and right side frames, particularly the bending rigidity in the vertical direction, as a measure for suppressing the vibration of the rear part of the vehicle body. However, it is often difficult to increase the weight of the vehicle body and to ensure the vertical cross-sectional shape of the side frame due to the vehicle body structure.

一方、サイドフレームのサスペンションを取付ける部位にはサスペンションから繰り返し入力される荷重を支持するための剛性が必要である一方、サイドフレームには後面衝突等の衝撃荷重を軸圧壊により吸収する脆弱部が要求される。   On the other hand, the part where the side frame suspension is to be mounted requires rigidity to support the load repeatedly input from the suspension, while the side frame requires a weak part that absorbs impact loads such as rear impact by axial crushing. Is done.

そのため、特許文献１に開示されるように、従来からサイドフレーム全体を、脆弱部を基準とする薄い板厚で形成し、剛性を必要とする各部位に補剛部材を個別に配置することで、サイドフレームに脆弱部と剛性部とを設定している。   Therefore, as disclosed in Patent Document 1, conventionally, the entire side frame is formed with a thin plate thickness based on the fragile portion, and a stiffening member is individually arranged at each part requiring rigidity. The fragile part and the rigid part are set in the side frame.

また、同特許文献１に開示されるように、サイドフレームを、前部フレームと後部フレームとに分割し、前部フレームの板厚を後部フレームに対して厚く設定することで前部フレームにてサスペンションからの荷重および後面衝突時の衝撃荷重を支持し、薄板の後部フレームによって後面衝突時の衝撃荷重で軸圧壊する脆弱なクラッシュゾーンを設定することが知られている。   Further, as disclosed in Patent Document 1, the side frame is divided into a front frame and a rear frame, and the thickness of the front frame is set to be thicker than that of the rear frame. It is known to set a fragile crash zone that supports the load from the suspension and the impact load at the time of rear collision, and the shaft collapses by the impact load at the time of rear collision by the rear frame of the thin plate.

特開２００５−１６２００５号公報JP 2005-162005 A

しかし、サイドフレーム全体を薄い板厚で形成し、剛性を必要とする部位に対応して補剛部材を配置するには、車体構造やサイドフレームの形状等によって補剛部材の取付部位および補剛部材の形状や大きさ等が制限され、所望の剛性効果が得られないことがある。   However, in order to form the entire side frame with a thin plate thickness and arrange the stiffening member corresponding to the part that requires rigidity, the attachment part of the stiffening member and the stiffening are determined depending on the vehicle body structure and the shape of the side frame. The shape and size of the member are limited, and a desired rigidity effect may not be obtained.

また、配設した補剛部材の質量増加の割にサイドフレームの剛性向上効果が得られないことが懸念される。   Moreover, there is a concern that the effect of improving the rigidity of the side frame cannot be obtained for the increase in the mass of the disposed stiffening member.

一方、サイドフレームを、板厚の異なる前部フレームと後部フレームとに分割して構成する際には、前部フレームと後部フレームとの結合等のサイドフレームの形状および構造が複雑になり、かつ厚板の前部フレームによる重量増加が懸念される。   On the other hand, when the side frame is divided into a front frame and a rear frame having different thicknesses, the shape and structure of the side frame such as the coupling of the front frame and the rear frame becomes complicated, and There is concern about weight increase due to the front frame of the plank.

従って、かかる点に鑑みてなされた本発明の目的は、簡単な構成でサスペンション荷重入力によるサイドフレームの曲げが抑制され、かつ車体振動が軽減できる車体後部構造を提供することにある。   Accordingly, an object of the present invention made in view of such a point is to provide a vehicle body rear structure that can suppress bending of a side frame due to suspension load input and reduce vehicle body vibration with a simple configuration.

上記目的を達成する請求項１に記載の車体後部構造は、車体下部両側に沿って前後方向に延在するとともにサスペンション荷重が入力されるサイドフレームと、該サイドフレームを補剛する補剛部材とを備えた車体後部構造において、前記補剛部材は、前記サイドフレームの上方に配設され且つ該サイドフレームの縦壁の位置のみで該縦壁に沿って該サイドフレームの伸長方向に一連に伸長し、前記サイドフレームに対して前後方向の３箇所で固定され、前記３箇所の固定箇所の内、前部の固定位置と後部の固定位置は、前記サイドフレーム上部に設定され、中間部は前記前部と後部の固定高さ位置以上の高さで保持されるように前記サイドフレームに直接又は間接に固定され、前記中間部の固定位置は、前記サスペンション荷重入力点の車体前後方向位置に相当する位置に設定されたことを特徴とする。 The vehicle body rear structure according to claim 1, which achieves the above object, includes a side frame that extends in the front-rear direction along both sides of the lower part of the vehicle body and receives a suspension load, and a stiffening member that stiffens the side frame. In the rear structure of the vehicle body, the stiffening member is arranged above the side frame and extends in series in the extending direction of the side frame along the vertical wall only at the position of the vertical wall of the side frame. The front frame is fixed at three positions in the front-rear direction with respect to the side frame, and among the three fixed positions, the front fixed position and the rear fixed position are set at the upper part of the side frame, It is fixed directly or indirectly to the side frame so as to be held at a height equal to or higher than the fixed height position of the front part and the rear part, and the fixed position of the intermediate part is the vehicle at the suspension load input point. Characterized in that it is set at a position corresponding to the front-rear direction position.

この構造によれば、サイドフレームの伸長方向に伸長する補剛部材の中間部の固定位置を、車体前後方向においてサスペンション荷重入力点に相当する位置に設定してサイドフレームに結合することで、サスペンションから上下方向の荷重が入力されてサイドフレームが上下方向に曲げられる際に、補剛部材の軸力によってサイドフレームの上下曲げが抑制され、かつ車体後部の振動が軽減される。   According to this structure, the fixed position of the intermediate portion of the stiffening member extending in the extending direction of the side frame is set to a position corresponding to the suspension load input point in the longitudinal direction of the vehicle body and coupled to the side frame, thereby When a load in the vertical direction is input from the side and the side frame is bent in the vertical direction, the vertical bending of the side frame is suppressed by the axial force of the stiffening member, and the vibration of the rear part of the vehicle body is reduced.

請求項２に記載の発明は、請求項１に記載の車体後部構造において、前記中間部の固定は、前記サイドフレームの上部に設けられた所定高さの取付部材を介して行われ、前記前部、後部の固定位置よりも高い位置で行われたことを特徴とする。   According to a second aspect of the present invention, in the vehicle body rear part structure according to the first aspect, the fixing of the intermediate portion is performed via an attachment member having a predetermined height provided on an upper portion of the side frame. It is characterized by being performed at a position higher than the fixed position of the rear part and the rear part.

この構造によれば、補剛部材の中間部をサイドフレームから上方に突出する取付部材に結合することで、サイドフレームが上下に曲がった際に、サイドフレームと補剛部材の干渉が抑制されるとともに補強部材の軸長が確保されて補強部材の軸力で効率的にサイドフレームの曲げが抑制される。   According to this structure, when the middle portion of the stiffening member is coupled to the mounting member protruding upward from the side frame, the interference between the side frame and the stiffening member is suppressed when the side frame is bent up and down. At the same time, the axial length of the reinforcing member is secured, and the bending of the side frame is efficiently suppressed by the axial force of the reinforcing member.

請求項３に記載の発明は、請求項２に記載の車体後部構造において、前記取付部材として、前記サスペンション荷重入力点の車体前後方向位置で、かつ前記サイドフレーム上方で車幅方向に延在して設けられたアッパクロスメンバが用いられたことを特徴とする。   According to a third aspect of the present invention, in the vehicle body rear structure according to the second aspect, the mounting member extends in the vehicle width direction above the side frame at a position in the vehicle longitudinal direction of the suspension load input point. The upper cross member provided is used.

この構成によれば、左右のサイドフレームに架け渡されて剛性が確保されたアッパクロスメンバに中間部の固定位置を設定することで、サイドフレームが上下に曲がった際に、サイドフレームと補剛部材の干渉が抑制されるとともに補強部材の軸長が確保されて補強部材の軸力で効率的にサイドフレームの曲げが抑制される。   According to this configuration, when the side frame is bent up and down by setting the fixed position of the intermediate portion to the upper cross member that is spanned between the left and right side frames and has secured rigidity, The interference of the members is suppressed and the axial length of the reinforcing member is secured, and the bending of the side frame is efficiently suppressed by the axial force of the reinforcing member.

請求項４に記載の発明は、請求項１〜３の何れか１項に記載の車体後部構造において、前記中間部の固定位置は、前記サスペンション荷重入力点に位置するサスペンションの緩衝装置取付部の車体前後方向位置に設定されたことを特徴とする。   According to a fourth aspect of the present invention, in the vehicle body rear structure according to any one of the first to third aspects, the fixing position of the intermediate portion is a suspension shock absorber mounting portion located at the suspension load input point. It is characterized in that it is set at a position in the longitudinal direction of the vehicle body.

この構造は、サスペンション荷重入力点を、走行に伴い上下方向の大きな荷重が繰り返し入力される緩衝装置取付部に設定する。これにより緩衝装置からの荷重が入力されて比較的曲げが発生する頻度が高い緩衝装置取付部近傍におけるサイドフレームの曲がりを積極的に抑制することができる。   In this structure, the suspension load input point is set to a shock absorber mounting portion to which a large load in the vertical direction is repeatedly input as the vehicle travels. As a result, it is possible to positively suppress the bending of the side frame in the vicinity of the shock absorber mounting portion where the load from the shock absorber is input and the bending frequently occurs.

請求項５に記載の発明は、請求項１〜４の何れか１項に記載の車体後部構造において、前記前部の固定位置および後部の固定位置は、前記サイドフレームの縦壁上端に形成されたフランジに設定されたことを特徴とする。   According to a fifth aspect of the present invention, in the vehicle body rear structure according to any one of the first to fourth aspects, the fixed position of the front portion and the fixed position of the rear portion are formed at the upper end of the vertical wall of the side frame. It is characterized by being set to a flange.

この構造によれば、補剛部材をサイドフレームの縦壁に形成されたフランジに結合することで、サイドフレームが上下方向に曲げられる際に、上下曲げ剛性に優れた縦壁の剪断方向に補剛部材の軸力が作用することで効率的にサイドフレームの上下曲げが抑制できる。   According to this structure, the stiffening member is coupled to the flange formed on the vertical wall of the side frame, so that when the side frame is bent in the vertical direction, the vertical wall is excellent in the shearing direction of the vertical wall having excellent bending rigidity. The vertical bending of the side frame can be efficiently suppressed by the axial force of the rigid member acting.

請求項６に記載の発明は、請求項１〜５の何れか１項に記載の車体後部構造において、前記サイドフレームは、前方に移行するに従って下降する傾斜部を有し、前記前部の固定位置は前記傾斜部に設定されたことを特徴とする。   According to a sixth aspect of the present invention, in the vehicle body rear part structure according to any one of the first to fifth aspects, the side frame has an inclined portion that descends as it moves forward, and the front portion is fixed. The position is set in the inclined portion.

この構造によれば、補剛部材の前部固定位置を傾斜範囲の後端近傍に設定することで、サイドフレームが上下に曲がった際、サイドフレームと補剛部材との干渉が抑制されて補剛部材による軸力で効率的にサイドフレームの上下曲げが抑制される。   According to this structure, the front fixing position of the stiffening member is set in the vicinity of the rear end of the inclined range, so that when the side frame bends up and down, interference between the side frame and the stiffening member is suppressed. The side frame is prevented from bending up and down efficiently by the axial force of the rigid member.

請求項７に記載の発明は、請求項１〜６の何れか１項に記載の車体後部構造において、前記補剛部材は、前記中間部から前記前部まで延在する筒状の前側連結部と、前記中間部から前記後部まで延在する筒状の後側連結部とを備えたことを特徴とする。   The invention according to claim 7 is the vehicle body rear portion structure according to any one of claims 1 to 6, wherein the stiffening member is a cylindrical front side connecting portion extending from the intermediate portion to the front portion. And a cylindrical rear connection portion extending from the intermediate portion to the rear portion.

この構造によれば、補剛部材を筒状に形成することで、補剛部材の安定した比較的大きな軸力が確保できる。   According to this structure, by forming the stiffening member in a cylindrical shape, a stable and relatively large axial force of the stiffening member can be secured.

請求項８に記載の発明は、請求項１〜７の何れか１項に記載の車体後部構造において、前記補剛部材は、シート状板材を巻回して筒状に形成されたことを特徴とする。   The invention according to claim 8 is the vehicle body rear structure according to any one of claims 1 to 7, wherein the stiffening member is formed in a cylindrical shape by winding a sheet-like plate material. To do.

この構造によれば、シート状板材を巻回することで、軸力が確保できる筒状の補剛部材が容易かつ効率的に製造できる。   According to this structure, the cylindrical stiffening member that can secure the axial force can be easily and efficiently manufactured by winding the sheet-like plate material.

本発明によると、サイドフレームの伸長方向に伸長する補剛部材の中間部を車体前後方向においてサスペンション荷重入力点に相当する位置に設定するとともに前部および後部をサイドフレームにそれぞれ結合することで、サスペンション荷重が入力されてサイドフレームが上下方向に曲げられる際に、補剛部材の軸力によってサイドフレームの上下曲げが抑制され、かつ車体後部の振動が軽減される。   According to the present invention, by setting the intermediate portion of the stiffening member extending in the extending direction of the side frame at a position corresponding to the suspension load input point in the longitudinal direction of the vehicle body and coupling the front portion and the rear portion to the side frame, When the suspension load is input and the side frame is bent in the vertical direction, the vertical bending of the side frame is suppressed by the axial force of the stiffening member, and the vibration of the rear part of the vehicle body is reduced.

車体後部の概要を示す要部破断斜視図である。It is a principal part fracture perspective view showing the outline of the rear part of a vehicle body. 車体後部における車体フレームの概略平面図である。It is a schematic plan view of the vehicle body frame in the vehicle body rear part. 図１のＩＩＩ部拡大図である。It is the III section enlarged view of FIG. 図３のＩＶ矢視図である平面図である。It is a top view which is IV arrow line view of FIG. 図４のＶ−Ｖ線断面図である。It is the VV sectional view taken on the line of FIG. 図４のＶＩ−ＶＩ線断面図である。It is the VI-VI sectional view taken on the line of FIG. 図４のＶＩＩ−ＶＩＩ線断面図である。It is the VII-VII sectional view taken on the line of FIG. 補剛部材の斜視図である。It is a perspective view of a stiffening member. 補剛部材の製造方法を示す説明図である。It is explanatory drawing which shows the manufacturing method of a stiffening member. 模式的に示す作用説明図である。It is an action explanatory view showing typically.

本発明における車体後部構造の一実施の形態を図１乃至図９を参照して説明する。   One embodiment of a vehicle body rear structure according to the present invention will be described with reference to FIGS.

図１は車体後部の概要を示す要部破断斜視図、図２は車体後部における車体フレーム等の概略平面図である。図３は図１のＩＩＩ部拡大図、図４は図３のＩＶ矢視図である平面図、図５は図４のＶ−Ｖ線断面図、図６は図４のＶＩ−ＶＩ線断面図、図７は図４のＶＩＩ−ＶＩＩ線断面図、図７は図４のＶＩＩ−ＶＩＩ線断面図、図８は補剛部材の斜視図、図９は補剛部材の製造方法の説明図である。なお、各図において矢印Ｆｔは車体前方方向を示す。   FIG. 1 is a fragmentary perspective view showing the outline of the rear part of the vehicle body, and FIG. 2 is a schematic plan view of the vehicle body frame and the like at the rear part of the vehicle body. 3 is an enlarged view of III part of FIG. 1, FIG. 4 is a plan view taken along arrow IV in FIG. 3, FIG. 5 is a cross-sectional view taken along line VV in FIG. 7 is a sectional view taken along line VII-VII in FIG. 4, FIG. 7 is a sectional view taken along line VII-VII in FIG. 4, FIG. 8 is a perspective view of a stiffening member, and FIG. It is. In each figure, an arrow Ft indicates the vehicle body front direction.

車体後部は、図１および図２に示すように、車体下部左右両側に沿って延在する左右のサイドシル１の後部に、各々前後方向に伸長する左右のサイドフレーム１０の前端が接合される。各サイドフレーム１０は、内側縦壁１１および外側縦壁１２の対向する一対の縦壁と、底壁１３を有する上方が開放された断面略コ字状で車体下部左右両側に沿って前後方向に延在し、内側縦壁１１および外側縦壁１２の上端にフランジ１１ａ、１２ａが折曲形成される。   As shown in FIGS. 1 and 2, the rear ends of the vehicle body are joined to the rear portions of the left and right side sills 1 extending along the left and right sides of the lower part of the vehicle body and the front ends of the left and right side frames 10 extending in the front-rear direction. Each side frame 10 has a substantially U-shaped cross-section with a pair of vertical walls that are opposed to the inner vertical wall 11 and the outer vertical wall 12 and a bottom wall 13 and is open in the front-rear direction along the left and right sides of the lower part of the vehicle body. The flanges 11 a and 12 a are bent at the upper ends of the inner vertical wall 11 and the outer vertical wall 12.

各サイドフレーム１０は、前端がサイドシル１に接続されて略水平状態で後方向に延在する前部１０Ａと、この前部１０Ａの後端に連続形成されて後輪の前側から上側に亘って次第に上昇するように傾斜するキックアップ部となる傾斜部１０Ｂと、傾斜部１０Ｂの後端から後方に折曲して略水平状態で後方に延在する後部１０Ｃとが連続する。サイドフレーム１０の後端がリヤスカート３に結合される。   Each side frame 10 has a front end 10A connected to the side sill 1 and extending rearward in a substantially horizontal state, and is continuously formed at the rear end of the front portion 10A and extends from the front side to the upper side of the rear wheel. An inclined portion 10B that becomes a kick-up portion that is inclined so as to gradually rise and a rear portion 10C that is bent rearward from the rear end of the inclined portion 10B and extends rearward in a substantially horizontal state are continuous. The rear end of the side frame 10 is coupled to the rear skirt 3.

左右のサイドフレーム１０の前端間に車幅方向に延在する前側クロスメンバ５が架け渡され、後部１０Ｂに中央クロスメンバ６、サスペンションクロスメンバ７、リヤクロスメンバ８およびアッパクロスメンバ１６が架け渡される。   A front cross member 5 extending in the vehicle width direction is bridged between the front ends of the left and right side frames 10, and a central cross member 6, a suspension cross member 7, a rear cross member 8, and an upper cross member 16 are bridged on the rear portion 10B. It is.

フロアパネル２が、前側クロスメンバ５、中央クロスメンバ６、サスペンションクロスメンバ７およびリヤクロスメンバ８上に載置されて左右のサイドフレーム１０の間に架け渡される。フロアパネル２の両側が左右のサイドフレーム１０のフランジ１１ａに結合され、後端がリヤスカート３に結合される。また、各サイドフレーム１０の開口が車体前後方向に延在するクロージングプレート１５で閉じられる。   The floor panel 2 is placed on the front cross member 5, the central cross member 6, the suspension cross member 7, and the rear cross member 8 and is bridged between the left and right side frames 10. Both sides of the floor panel 2 are coupled to the flanges 11 a of the left and right side frames 10, and the rear ends are coupled to the rear skirt 3. Further, the opening of each side frame 10 is closed by a closing plate 15 extending in the longitudinal direction of the vehicle body.

クロージングプレート１５には、図６に示すように、サイドフレーム１０の傾斜部１０Ｂの後端近傍および後部１０Ｃの前後方向中間部においてフランジ１１ａと対向する位置にそれぞれ後述する補剛部材２０の前部取付部２４および後部取付部２７が載置される前側取付部１５Ｆおよび後側取付部１５Ｒが形成される。この前側取付部１５Ｆおよび後側取付部１５Ｒにそれぞれ補剛部材２０の前部取付部２４および後部取付部２７をボルト結合するための取付穴１５ｆ、１５ｒが形成される。また、フランジ１１ａに取付穴１５ｆ、１５ｒに対応して取付穴１１ｆ、１１ｒが穿孔される。   As shown in FIG. 6, the closing plate 15 includes a front portion of a stiffening member 20 which will be described later at positions facing the flange 11a in the vicinity of the rear end of the inclined portion 10B of the side frame 10 and in the middle portion in the front-rear direction of the rear portion 10C. A front mounting portion 15F and a rear mounting portion 15R on which the mounting portion 24 and the rear mounting portion 27 are placed are formed. Attachment holes 15f and 15r for bolting the front attachment part 24 and the rear attachment part 27 of the stiffening member 20 are formed in the front attachment part 15F and the rear attachment part 15R, respectively. Further, mounting holes 11f and 11r are drilled in the flange 11a corresponding to the mounting holes 15f and 15r.

このサイドフレーム１０およびクロージングプレート１５の外側に沿ってホイールハウス４が形成されるサイドストラクチャが設けられる。   A side structure in which the wheel house 4 is formed along the outside of the side frame 10 and the closing plate 15 is provided.

サイドフレーム１０の後部１０Ｃの前端近傍において、図５に示すようにサスペンション４０が配置される。サスペンション４０は、例えば後輪を回転自在に支持するハウジングと、前部がサイドフレーム１０の傾斜部１０Ｂの下端近傍に揺動可能に支持されて後端がハウジングに結合されるトレーリングアームと、ハウジングに外端部が揺動可能に連結されて内端部がサスペンションクロスメンバ７の車幅方向中央部近傍に揺動自在に支持されるロアリンクおよびアッパリンクと、ハウジングとサイドフレーム１０の後部１０Ｃの前端近傍に設けられたマウントブラケット３１との間に介設された緩衝装置４１とを有している。この緩衝装置４１が取り付けられるサイドフレーム１０の位置が後述するサスペンション荷重入力点Ｐとなる。   In the vicinity of the front end of the rear portion 10C of the side frame 10, a suspension 40 is disposed as shown in FIG. The suspension 40 includes, for example, a housing that rotatably supports a rear wheel, a trailing arm that is swingably supported in the vicinity of the lower end of the inclined portion 10B of the side frame 10, and a rear end that is coupled to the housing. A lower link and an upper link, the outer end of which is swingably connected to the housing and the inner end of which is swingably supported in the vicinity of the center of the suspension cross member 7 in the vehicle width direction, and the rear portion of the housing and the side frame 10 And a shock absorber 41 interposed between the mount bracket 31 provided in the vicinity of the front end of 10C. The position of the side frame 10 to which the shock absorber 41 is attached becomes a suspension load input point P described later.

ロアリンクおよびアッパリンクはトレーリングアームの揺動時に揺動可能に構成され、緩衝装置４１はダンパ４２およびコイルスプリング４３等で構成される。走行に伴う後輪からの上下方向の衝撃荷重は主に緩衝装置４１によって受け止められ、マウントブラケット３１を介してサイドフレーム１０および各クロスメンバに分散される。特に緩衝装置４１を支持するマウントブラケット３１等を介してサイドフレーム１０の後部１０Ｃの前端近傍のサスペンション荷重入点Ｐに上下方向のサスペンション荷重が入力される。なお、サスペンション４０は本発明と直接的な関係がないので、詳細な説明は省略する。   The lower link and the upper link are configured to swing when the trailing arm swings, and the shock absorber 41 includes a damper 42, a coil spring 43, and the like. The impact load in the vertical direction from the rear wheel accompanying traveling is mainly received by the shock absorber 41 and distributed to the side frame 10 and each cross member via the mount bracket 31. In particular, the vertical suspension load is input to the suspension load entry point P in the vicinity of the front end of the rear portion 10C of the side frame 10 through the mount bracket 31 and the like that support the shock absorber 41. Since the suspension 40 is not directly related to the present invention, detailed description thereof is omitted.

サスペンション荷重入力点Ｐに相当するサイドフレーム１０の車体前後方向位置、すなわちサスペンション荷重入力点Ｐ近傍に、左右のサイドフレーム１０の後部１０Ｃの前端近傍間に亘ってフロアパネル２の上面を車幅方向に延在する所定高さの取付部材であるアッパクロスメンバ１６が架け渡される。   The position of the side frame 10 corresponding to the suspension load input point P in the longitudinal direction of the vehicle body, that is, in the vicinity of the suspension load input point P, the upper surface of the floor panel 2 extends in the vehicle width direction across the vicinity of the front end of the rear portion 10C of the left and right side frames 10. An upper cross member 16 which is an attachment member having a predetermined height extending over the bridge is bridged.

アッパクロスメンバ１６は、図１乃至図３に示すように前側面１７、後側面１８及び上面１９を有して下方が開放された断面略コ字状でフロアパネル２およびクロージングプレート１５の上面に沿って車幅方向に延在し、前側面１７および後側面１８の下縁に、サイドフレーム１０のフランジ１１ａ、フロアパネル２およびクロージングプレート１５に等に結合されるフランジ１７ａ、１８ａが折曲形成された断面略ハット状に形成される。   The upper cross member 16 has a front side surface 17, a rear side surface 18 and an upper surface 19 as shown in FIGS. The flanges 17a and 18a that extend in the vehicle width direction and are coupled to the flange 11a of the side frame 10, the floor panel 2, and the closing plate 15 are bent at the lower edges of the front side 17 and the rear side 18. The cross section is formed in a substantially hat shape.

また、サイドフレーム１０の内側縦壁１１に折曲形成したフランジ１１ａと対向する上面１９の位置に後述する補剛部材２０の取付基部２１Ａが載置される補剛部材取付部１９Ａが形成される。補剛部材取付部１９Ａに補剛部材２０の取付基部２１Ａをボルト結合するための取付穴１９ａが形成される。   Further, a stiffening member mounting portion 19A on which a mounting base portion 21A of a stiffening member 20 described later is placed is formed at the position of the upper surface 19 facing the flange 11a bent on the inner vertical wall 11 of the side frame 10. . A mounting hole 19a for bolting the mounting base portion 21A of the stiffening member 20 to the stiffening member mounting portion 19A is formed.

このアッパクロスメンバ１６の端部とクロージングプレート１５とホイールハウス４とを強固に結合して車体剛性およびマウントブラケット３１を介して取り付けられる緩衝装置４１の支持剛性を向上させる断面略コ字状のガセット３２が取り付けられる。   A gusset having a substantially U-shaped cross section that improves the rigidity of the vehicle body and the shock absorber 41 attached via the mount bracket 31 by firmly coupling the end of the upper cross member 16, the closing plate 15, and the wheel house 4. 32 is attached.

更に、サイドフレーム１０の伸長方向に伸長してサイドフレーム１０を補剛する補剛部材２０が、サイドフレーム１０の上方において傾斜部１０Ｂから後部１０Ｃに亘って配設される。図８および図６を参照して補剛部材２０を説明する。なお。補剛部材２０の説明にあたり便宜上図２乃至図７に示すように車体に取り付けられた状態を参照して説明する。   Further, a stiffening member 20 that extends in the extending direction of the side frame 10 and stiffens the side frame 10 is disposed above the side frame 10 from the inclined portion 10B to the rear portion 10C. The stiffening member 20 will be described with reference to FIGS. 8 and 6. Note that. For the sake of convenience, the stiffening member 20 will be described with reference to the state where it is attached to the vehicle body as shown in FIGS.

補剛部材２０は、サイドフレーム１０から上方に所定高さ突出するアッパクロスメンバ１６の上面１９に形成された基部取付部１９Ａに取り付けられる前後方向中央の中間部２１、中間部２１から前方に延在して前部がサイドフレーム１０の傾斜部１０Ｂの後部近傍に前部固定位置Ｆとして結合される前側連結部２２と、中間部２１から後方に延在して後部が後部範囲１０Ｃの中間部に後部固定位置Ｒとして結合される後側連結部２５とが連続して一体形成される。   The stiffening member 20 extends forward from the intermediate portion 21 at the center in the front-rear direction, which is attached to a base attaching portion 19A formed on the upper surface 19 of the upper cross member 16 protruding upward from the side frame 10 by a predetermined height. A front connecting portion 22 which is connected as a front fixing position F in the vicinity of the rear portion of the inclined portion 10B of the side frame 10 and a rear portion extending rearward from the intermediate portion 21 and the rear portion being an intermediate portion of the rear range 10C. And the rear connecting portion 25 coupled as the rear fixing position R are continuously formed integrally.

中間部２１は、アッパクロスメンバ１６の上面１９に形成された剛性部材取付部１９Ａ上に載置されて結合される取付基部２１Ａおよび取付基部２１Ａの車幅方向内縁に沿って上方に折曲形成される基部縦壁部２１Ｂを有する断面Ｌ字状で車体前後方向に延在する。取付基部２１Ａにアッパクロスメンバ１６の上面１９にボルト結合するための取付穴２１ａが穿孔される。   The intermediate portion 21 is mounted on a rigid member mounting portion 19A formed on the upper surface 19 of the upper cross member 16, and is bent upward along the vehicle width direction inner edge of the mounting base portion 21A. The base vertical wall portion 21B has an L-shaped cross section and extends in the longitudinal direction of the vehicle body. A mounting hole 21a for bolting to the upper surface 19 of the upper cross member 16 is formed in the mounting base 21A.

前側連結部２２は、中間部２１における取付基部２１Ａの前端に折曲部を介して取付基部２１Ａに対してアッパクロスメンバ１６の上面１９と傾斜部１０Ｂの上面、すなわち該傾斜部１０Ｂにおけるフランジ１１ａやクロージングパネル１５とのなす角度にほぼ相当する角度を有して連続して傾斜部１０Ｂにおける内側縦壁１１に沿って前方に延在する前側基部２３Ａと、前側基部２３Ａの車幅方向内縁に沿って上方に折曲されるとともに後端が中間部２１の基部縦壁部２１Ｂに連続する内側縦壁部２３Ｂと、前側基部２３Ａの車幅方向外縁に沿って上方に折曲形成されて内側縦壁部２３Ｂと対峙する外側縦壁部２３Ｃと、この外側縦壁部２３Ｃの上縁に沿って内方に折曲して前側基部２３Ａと対向するとともに先端が内側縦壁部２３Ｂの上縁に接合される上側壁部２３Ｄとによって形成される矩形筒状で略直線状に延在する前側連結部本体２３を有する。前側基部２３Ａの前部に傾斜部１０Ｂに形成された前側取付部１５Ｆにボルト結合するための取付穴２４ｆが穿孔された前部取付部２４が形成される。この前側基部２３Ａ、内側縦壁部２３Ｂ、外側縦壁部２３Ｃおよび上側壁部２３Ｄによって矩形筒状で略直線状に延在する前側連結部本体２３は軸方向の引張および圧縮荷重に対する抗力に優れた、安定した比較的大きな軸力が確保される。   The front connecting portion 22 has a bent portion at the front end of the attachment base portion 21A in the intermediate portion 21, and the upper surface 19 of the upper cross member 16 and the upper surface of the inclined portion 10B with respect to the attachment base portion 21A, that is, the flange 11a in the inclined portion 10B. And the front base 23A extending forward along the inner vertical wall 11 in the inclined portion 10B continuously at an angle substantially corresponding to the angle formed with the closing panel 15 and the inner edge in the vehicle width direction of the front base 23A. The inner vertical wall portion 23B is bent upward along the outer edge in the vehicle width direction of the front base portion 23A, and the inner side is bent upward. The outer vertical wall portion 23C facing the vertical wall portion 23B, the inner vertical wall portion 23C bent inward along the upper edge of the outer vertical wall portion 23C, and opposed to the front base portion 23A. Having a front coupling portion main unit 23 extending substantially straight in a rectangular tubular shape formed by the side wall portion 23D on which is joined to. A front mounting portion 24 is formed in the front portion of the front base portion 23A. The front mounting portion 24 is formed with a mounting hole 24f for bolting to a front mounting portion 15F formed in the inclined portion 10B. The front side connecting portion 23 extending in a substantially cylindrical shape in a rectangular tube shape by the front side base portion 23A, the inner vertical wall portion 23B, the outer vertical wall portion 23C and the upper side wall portion 23D is excellent in resistance to tensile and compressive loads in the axial direction. In addition, a stable and relatively large axial force is ensured.

後側連結部２５は、中間部２１の取付基部２１Ａの後端に折曲部を介して取付基部２１Ａに対して後方に移行するに従って次第に下降して後部１０Ｃの上面となる該部におけるクロージングプレート１５に接近するように傾斜して後部１０Ｃにおける内側縦壁１１に沿って後方に延在する後側基部２６Ａと、後側基部２６Ａの車幅方向内縁に沿って上方に折曲形成されるとともに基部２１の基部縦壁部２１Ｂに連続する内側縦壁部２６Ｂと、後側基部２６Ａの車幅方向外縁に沿って上方に折曲形成されて内側縦壁部２６Ｂと対峙する外側縦壁部２６Ｃと、外側縦壁部２６Ｃの上縁に沿って内方に折曲して後側基部２６Ａと対向するとともに前端が内側壁部２６Ｂの上縁に接合される上側壁部２６Ｄとによって形成される矩形筒状で略直線状に延在する後側連結部本体２６を有する。後側基部２６Ａの後部に後部１０Ｃに形成された後側取付部１５Ｌにボルト結合するための取付穴２７ｆが穿孔された後部取付部２７が形成される。この後側基部２６Ａ、内側縦壁部２６Ｂ、外側縦壁部２６Ｃおよび上側壁部２６Ｄによって矩形筒状で略直線状に形成された後側連結部本体２６は軸方向の引張および圧縮荷重に対する抗力となる安定した比較的大きな軸力が確保される。   The rear connecting portion 25 is gradually closed at the rear end of the attachment base portion 21A of the intermediate portion 21 via the bent portion, and gradually moves downward to become the upper surface of the rear portion 10C. The rear base portion 26A is inclined so as to approach 15 and extends rearward along the inner vertical wall 11 in the rear portion 10C, and is bent upward along the inner edge in the vehicle width direction of the rear base portion 26A. An inner vertical wall portion 26B continuous with the base vertical wall portion 21B of the base portion 21, and an outer vertical wall portion 26C that is bent upward along the vehicle width direction outer edge of the rear base portion 26A and faces the inner vertical wall portion 26B. And an upper side wall portion 26D which is bent inward along the upper edge of the outer vertical wall portion 26C to face the rear base portion 26A and whose front end is joined to the upper edge of the inner wall portion 26B. A rectangular tube with a substantially straight line Having side coupling portion main unit 26 after the standing. A rear attachment portion 27 is formed in the rear portion of the rear base portion 26A. The attachment portion 27f is bolted to the rear attachment portion 15L formed in the rear portion 10C. The rear side connecting portion body 26 formed in a substantially cylindrical shape by the rear base portion 26A, the inner vertical wall portion 26B, the outer vertical wall portion 26C and the upper side wall portion 26D is resistant to tensile and compressive loads in the axial direction. A stable and relatively large axial force is secured.

この補剛部材２０は、シート状板材を巻回することで容易、かつ効率的に製造できる。この製造方法の一例を図９を参照して説明する。   The stiffening member 20 can be easily and efficiently manufactured by winding a sheet-like plate material. An example of this manufacturing method will be described with reference to FIG.

この補剛部材２０は、例えば、図９（ａ）に示すようなシート状板材１００、すなわち内側縦壁部２３Ｂ、基部縦壁部２１Ｂ、内側縦壁部２６Ｂを形成する内側縦壁部形成１２３Ｂ、基部縦壁部形成部１２１Ｂ、内側縦壁部１２６Ｂが連続し、この側縁に沿って前部取付部２４、前側基部２３Ａ、取付基部２１Ａ、後側基部２６Ａ、後部取付部２７を形成する前部取付部形成部１２４、前側基部形成部１２３Ａ、取付基部形成部１２１Ａ、後側基部形成部１２６Ａ、後部取付部形成部１２７が連続し、更に前側基部形成部１２３Ａに外側縦壁２３Ｃおよび上側壁部２３Ｄを形成する外側縦壁部形成部１２３Ｃおよび上壁部形成部１２３Ｄが連続し、後部基部形成部１２６Ａに外側縦壁部２６Ｃおよび上側壁部２６Ｄを形成する外側縦壁部形成部１２６Ｃおよび上側壁部形成部１２６Ｄが連続するシート状板材１００を素材とする。このシート状板材１００は、汎用のシート状板材を切削あるいはプレス加工等の打ち抜き加工により容易かつ効率的に安価に製造できる。   The stiffening member 20 is, for example, a sheet-like plate member 100 as shown in FIG. 9A, that is, an inner vertical wall forming 123B that forms an inner vertical wall 23B, a base vertical wall 21B, and an inner vertical wall 26B. The base vertical wall portion forming portion 121B and the inner vertical wall portion 126B are continuous, and the front mounting portion 24, the front base portion 23A, the mounting base portion 21A, the rear base portion 26A, and the rear mounting portion 27 are formed along this side edge. The front mounting portion forming portion 124, the front base forming portion 123A, the mounting base forming portion 121A, the rear base forming portion 126A, and the rear mounting portion forming portion 127 are continuous, and the outer vertical wall 23C and the upper side are further connected to the front base forming portion 123A. The outer vertical wall portion forming portion 123C and the upper wall portion forming portion 123D forming the side wall portion 23D are continuous, and the outer vertical wall portion forming the outer vertical wall portion 26C and the upper wall portion 26D in the rear base portion forming portion 126A. 126C and the upper side wall portion forming portion 126D and the material of the sheet-like plate 100 which is continuous. The sheet-like plate material 100 can be easily and efficiently manufactured at low cost by punching a general-purpose sheet-like plate material such as cutting or pressing.

このシート状板材１００を、図９（ｂ）のように、前部取付部形成部１２４、前側基部形成部１２３Ａ、取付基部形成部１２１Ａ、後側基部形成部１２６Ａおよび後部取付部形成部１２７と、内側縦壁部形成１２３Ｂ、基部縦壁部形成部１２１Ｂ及び内側縦壁部１２６Ｂとの間をＬ字状に折曲する。   As shown in FIG. 9B, the sheet-like plate member 100 is divided into a front mounting portion forming portion 124, a front base forming portion 123A, a mounting base forming portion 121A, a rear base forming portion 126A, and a rear mounting portion forming portion 127. The inner vertical wall portion formation 123B, the base vertical wall portion formation portion 121B, and the inner vertical wall portion 126B are bent in an L shape.

次に、図９（ｃ）のように、前側基部形成部１２３Ａと外側縦壁形成部１２３Ｃとの間をＬ字状に折曲し、同様に後側基部形成部１２６Ａと外側縦壁形成部１２６Ｃとの間をＬ字状に折曲する。   Next, as shown in FIG. 9C, the space between the front base portion forming portion 123A and the outer vertical wall forming portion 123C is bent in an L shape, and the rear base portion forming portion 126A and the outer vertical wall forming portion are similarly formed. Bend to 126C in an L shape.

続いて図９（ｄ）のように、外側縦壁部形成部１２３Ｃと上側壁部形成部１２３Ｄの間をＬ字状に折曲して上壁部形成部１２３Ｄの先端を内側縦壁部形成部１２３Ｂの先端に当接する。同様に外側縦壁形成部１２６Ｃと上側壁部形成部１２６Ｄとの間をＬ字状に折曲して上壁部形成部１２６Ｄの先端を内側縦壁部形成部１２３Ｂの先端に当接する。   Subsequently, as shown in FIG. 9D, the space between the outer vertical wall portion forming portion 123C and the upper wall portion forming portion 123D is bent in an L shape so that the tip of the upper wall portion forming portion 123D is formed as the inner vertical wall portion. It contacts the tip of the part 123B. Similarly, the outer vertical wall forming portion 126C and the upper side wall forming portion 126D are bent in an L shape so that the tip of the upper wall forming portion 126D abuts on the tip of the inner vertical wall forming portion 123B.

次に、図９（ｅ）のように、取付基部形成部１２１Ａと前側基部形成部１２３Ａとの間、取付基部形成部１２１Ａと後側基部形成部１２６Ａとの間をそれぞれ所定角度折曲する。また、後側基部形成部１２６Ａと後側取付部形成部１２７との間を折曲する。しかる後、当接する上側壁部形成部１２３Ｄの先端と内側縦壁部１２３Ｂの先端とを溶接結合し、同様に上壁部形成部１２６Ｄの先端と内側縦壁部１２６Ｂの先端とを溶接結合する。その後、取付基部形成部１２１Ａに取付穴２１ａ、前部取付部形成部１２４に取付穴２４ａ、後部取付部１２７に取付穴２７ａをそれぞれ穿孔することで、図８に示すような所定の補剛部材２０が製造される。   Next, as shown in FIG. 9E, a predetermined angle is bent between the attachment base forming portion 121A and the front base forming portion 123A, and between the attachment base forming portion 121A and the rear base forming portion 126A. Further, the rear base portion 126A and the rear attachment portion 127 are bent. Thereafter, the tip of the upper wall portion forming portion 123D and the tip of the inner vertical wall portion 123B that are in contact with each other are welded, and similarly, the tip of the upper wall portion forming portion 126D and the tip of the inner vertical wall portion 126B are welded. . Thereafter, a predetermined stiffening member as shown in FIG. 8 is formed by drilling the mounting hole 21a in the mounting base forming part 121A, the mounting hole 24a in the front mounting part forming part 124, and the mounting hole 27a in the rear mounting part 127, respectively. 20 is manufactured.

これらシート状板材１００の巻回は、例えば、生産性に優れた周知のプレス加工等により容易かつ効率的に行え、補剛部材２０を安価に製造できる。   The sheet-like plate material 100 can be wound easily and efficiently by, for example, a well-known press working with excellent productivity, and the stiffening member 20 can be manufactured at low cost.

また、シート状板材１００を、ロールフォーミング加工することによって連続的に巻回して補剛部材２０を製造する等、他の既存の加工により製造することもできる。   Moreover, the sheet-like board | plate material 100 can also be manufactured by other existing processes, such as winding continuously by roll forming, and manufacturing the stiffening member 20. FIG.

このように構成された補剛部材２０の取付状態を図４乃至図７を参照して説明
する。 The attachment state of the stiffening member 20 configured as described above will be described with reference to FIGS.

図４および図６に示すように、補剛部材２０を、その中間部２１の基部縦壁部２１Bがサイドフレーム１０の内側縦壁１１と車幅方向で一致した状態で、取付基部２１Ａをサイドフレーム１０の後部１０Ｃの前端近傍においてサイドフレーム１０から上方に突出するアッパクロスメンバ１６の上面１９に形成された補剛部材取付部１９Ａ上に載置し、かつ前側連結部２２の前部取付部２４および後側連結部２５の後部取付部２７をそれぞれクロージングプレート１５の取付部１５Ｆおよび１５Ｒ上に載置してサイドフレーム１０およびアッパクロスメンバ１６の上面１９上に位置決めセットする。この位置決めされた補剛部材２０は、中間部２１の基部縦壁部２１Bと前側連結部２２の内側縦壁部２３Bと後側連結部２５の内側縦壁部２６Bとがサイドフレーム１０の内側縦壁１１と車幅方向で一致或いは略一致する。   As shown in FIGS. 4 and 6, the mounting base 21 </ b> A is placed on the side of the stiffening member 20 with the base vertical wall 21 </ b> B of the intermediate portion 21 aligned with the inner vertical wall 11 of the side frame 10 in the vehicle width direction. Near the front end of the rear portion 10C of the frame 10, it is placed on a stiffening member mounting portion 19A formed on the upper surface 19 of the upper cross member 16 protruding upward from the side frame 10, and the front mounting portion of the front connecting portion 22 24 and the rear attachment portion 27 of the rear connecting portion 25 are placed on the attachment portions 15F and 15R of the closing plate 15, respectively, and positioned and set on the upper surface 19 of the side frame 10 and the upper cross member 16. The positioned stiffening member 20 includes a base vertical wall portion 21B of the intermediate portion 21, an inner vertical wall portion 23B of the front side connecting portion 22, and an inner vertical wall portion 26B of the rear side connecting portion 25. It coincides with or substantially coincides with the wall 11 in the vehicle width direction.

この位置決めされた補剛部材２０の取付基部２１Ａを、取付基部２１Ａの取付穴２１ａおよびアッパクロスメンバ１６の上面１９に形成された取付穴１９ａを貫通するボルト３１およびナット等でアッパクロスメンバ１６の上面１９に中間部固定位置Ｃとして締結する。同様に前部取付部２４を、その前側の前部取付部２４の取付穴２４ｆ、クロージングプレート１５の取付部１５Ｆに形成され取付穴１５ｆおよびフランジ１１ａの取付穴１１ｆを貫通するボルト３１およびナット等でサイドフレーム１０の傾斜部１０Ｂの後端近傍に図７等に示すように前部固定位置結Ｆとして結合する。更に、後部取付部２７を、その後側の後部取付部２７の取付穴２２ｒ、クロージングプレート１５の取付部１５Ｒに形成され取付穴１５ｒおよびフランジ１１ａの取付穴１１ｒを貫通するボルト３１ａ及びナット等でサイドフレーム１０の後部１０Ｃの前後方向中間部に後部固定位置Ｒとして結合する。   The positioning base 21A of the positioned stiffening member 20 is attached to the upper cross member 16 with bolts 31 and nuts that penetrate the mounting holes 21a of the mounting base 21A and the mounting holes 19a formed in the upper surface 19 of the upper cross member 16. Fastened to the upper surface 19 as an intermediate portion fixing position C. Similarly, a bolt 31 and a nut etc. which are formed in the attachment hole 24f of the front attachment part 24 on the front side, the attachment hole 15f formed in the attachment part 15F of the closing plate 15 and the attachment hole 11f of the flange 11a, etc. Thus, as shown in FIG. Further, the rear mounting portion 27 is side-mounted by bolts 31a, nuts and the like that are formed in the mounting holes 22r of the rear mounting portion 27 on the rear side and the mounting holes 15r formed in the mounting portion 15R of the closing plate 15 and the mounting holes 11r of the flange 11a. The frame 10 is coupled to a middle portion in the front-rear direction of the rear portion 10C of the frame 10 as a rear fixing position R.

このように取り付けられた剛性部材２０は、図４乃至図６に示すように、サイドフレーム１０の後部１０Ｃの前端近傍で上方に突出するアッパクロスメンバ１６の上面１９に中間部２１が中間部固定位置Ｃとして結合され、中間部２１の前方に連続形成された前側連結部２２が前方に移行するに従って下降しつつサイドフレーム１０の内側縦壁１１に沿って延在して先端の前部取付部２４が傾斜部１０Ｂの後端近傍において前部固定位置Ｆとして結合される。これにより中間部２１と前部取付部２４との間の前側連結部２６がサイドフレーム１０と離間して配置され、後述するようにサイドフレーム１０が上下に曲がった際に前側連結部２２がサイドフレーム１０と干渉することなく、安定した軸力が確保できる。中間部２１がサイドフレーム１０から上方に突出するアッパクロスメンバ１６の上面１９に結合して前部取付部１４を傾斜範囲１０ｂに結合することで中間部固定位置Ｃと前側固定位置Ｆとの離間距離が十分に確保されて前側連結部２２の軸長が確保され、前側連結部２２の大きな軸力が得られる。   As shown in FIGS. 4 to 6, the rigid member 20 attached in this way has an intermediate portion 21 fixed to the upper surface 19 of the upper cross member 16 protruding upward in the vicinity of the front end of the rear portion 10 </ b> C of the side frame 10. The front connecting portion 22 coupled as the position C and continuously formed in front of the intermediate portion 21 extends along the inner vertical wall 11 of the side frame 10 while descending as it moves forward, and the front mounting portion at the tip. 24 is coupled as a front fixing position F in the vicinity of the rear end of the inclined portion 10B. As a result, the front connecting portion 26 between the intermediate portion 21 and the front mounting portion 24 is spaced apart from the side frame 10, and when the side frame 10 is bent up and down as described later, the front connecting portion 22 is A stable axial force can be secured without interfering with the frame 10. The intermediate portion 21 is coupled to the upper surface 19 of the upper cross member 16 projecting upward from the side frame 10, and the front mounting portion 14 is coupled to the inclined range 10b, whereby the intermediate portion fixing position C and the front side fixing position F are separated. A sufficient distance is ensured to secure the axial length of the front connecting portion 22, and a large axial force of the front connecting portion 22 is obtained.

一方、中間部２１の後端に連続形成された後側連結部２５が中間部２１から後方に移行するに従って下降しつつサイドフレーム１０に接近しつつサイドフレーム１０の内側縦壁１１に沿って延在して後部取付部２７が後部１０Ｃの前後方向中間において後部固定位置Ｒとして結合される。これにより中間部２１と後側取付部２７との間の後側連結部２５がサイドフレーム１０と離間して配置されることで後述するようにサイドフレーム１０が上下に曲がった際に後側連結部２５がサイドフレーム１０と干渉することなく、安定した軸力が確保できる。また、中間部２１がサイドフレーム１０から上方に突出するアッパクロスメンバ１６の上面１９に結合して前部取付部２４を傾斜部１０Ｂに結合することで中間部固定位置Ｃと後部固定位置Ｒとの離間距離が確保されて後側連結部２５の軸長が確保され、後側連結部２５の大きな軸力が得られる。   On the other hand, the rear connecting portion 25 formed continuously at the rear end of the intermediate portion 21 extends along the inner vertical wall 11 of the side frame 10 while descending toward the rear from the intermediate portion 21 and approaching the side frame 10. The rear mounting portion 27 is coupled as the rear fixing position R in the middle in the front-rear direction of the rear portion 10C. As a result, the rear connection portion 25 between the intermediate portion 21 and the rear attachment portion 27 is disposed away from the side frame 10 so that the rear connection is achieved when the side frame 10 is bent up and down as will be described later. A stable axial force can be secured without the portion 25 interfering with the side frame 10. Further, the intermediate portion 21 is coupled to the upper surface 19 of the upper cross member 16 projecting upward from the side frame 10, and the front mounting portion 24 is coupled to the inclined portion 10B. Is ensured, the axial length of the rear connecting portion 25 is ensured, and a large axial force of the rear connecting portion 25 is obtained.

すなわち、サイドフレーム１０の傾斜部１０Ｂから後部１０Ｃに亘り内側縦壁１１に沿ってサイドフレーム１０の伸長方向に伸長して配置される補剛部材２０を備え、補剛部材２０の中間部２１がアッパクロスメンバ１６を介してサスペンション荷重入力点Ｐに相当する車体前後方向位置となる中間部固定位置Ｃにおいてサイドフレーム１０の後部１０Ｃの前端近傍に結合され、前端が前部固定位置Ｆにおいて傾斜範囲１０Ｂに結合され、後部が後部範囲１０Ｃに結合される。 That is, provided with a stiffening member 20 which is arranged extended in the extending direction of the side frame 10 along the inside vertical wall 11 over the rear 10 C from the inclined portion 10B of the side frame 10, an intermediate portion 21 of the stiffening member 20 Is coupled to the vicinity of the front end of the rear portion 10C of the side frame 10 at the intermediate portion fixing position C corresponding to the suspension load input point P via the upper cross member 16, and the front end is inclined at the front fixing position F. Coupled to range 10B and the rear is coupled to rear range 10C.

このように構成された車体構造の作用を、要部を模式的に示す図１０の作用説明図を参照して説明する。   The operation of the vehicle body structure configured as described above will be described with reference to the operation explanatory diagram of FIG.

例えば、車両走行等により、サスペンションから車体部材に衝撃荷重が入力される。特に後輪の上下動を支持する緩衝装置４１から上下方向の衝撃荷重がサイドフレーム１０に入力され、サスペンション荷重入力点Ｐとなるサイドフレーム１０の後部１０Ｃの前端近傍が相対的に上下する曲げが繰り返される。   For example, an impact load is input from the suspension to the vehicle body member by traveling the vehicle or the like. In particular, an impact load in the vertical direction is input to the side frame 10 from the shock absorber 41 that supports the vertical movement of the rear wheel, and the bending in which the vicinity of the front end of the rear portion 10C of the side frame 10 serving as the suspension load input point P is relatively up and down is performed. Repeated.

ここで、サスペンション荷重入力点Ｐとなるサイドフレーム１０の後部１０Ｃの前端近傍が相対的に上昇して中間部固定位置Ｃが前部固定位置Ｆおよび後部固定位置Ｒの対し相対的に上昇するような上方への曲げ変形が発生した際には、その初期段階において、補剛部材２０の取付基部２１Ａが取付固定されるアッパクロスメンバ１６の上面１９、詳細には中間部固定位置Ｃが前部取付部２４が取り付けられる傾斜部１０Ｂの前部固定位置Ｆおよび後部取付部２７が取り付けられる後部１０Ｃの後部固定位置Ｒに対し相対的に微少量上方移動する。   Here, the vicinity of the front end of the rear portion 10C of the side frame 10 serving as the suspension load input point P is relatively raised so that the intermediate portion fixing position C is relatively raised with respect to the front portion fixing position F and the rear portion fixing position R. When an upward bending deformation occurs, the upper surface 19 of the upper cross member 16 to which the attachment base portion 21A of the stiffening member 20 is attached and fixed, in detail, the intermediate portion fixing position C is the front portion. The front portion fixing position F of the inclined portion 10B to which the attaching portion 24 is attached and the rear portion fixing position R to which the rear portion attaching portion 27 is attached are moved relatively slightly upward.

この中間部固定位置Ｃの相対的な上昇により中間部固定位置Ｃと後部固定位置Ｒとの間が微少量離反して取付基部２１Ａと前側取付部２４との間の前側連結部本体２３には引張り荷重が付与され、その反力となる前側連結部本体２３の軸力Ａによって中間部固定位置Ｃと前部固定位置Ｆの離反を拘束する。一方、中間部固定位置Ｃの相対的な上昇により中間部固定位置Ｃと後部固定位置Ｒとが互いに離反して後側連結部本体２６には引張荷重が付与され、その反力となる後側連結部本体２６の軸力Ａによって中間部固定位置Ｃと後部固定位置Ｒの離反を拘束してサイドフレーム１０の曲がりを抑制する。 The relative increase in the intermediate portion fixed position C to the front connecting portion body 23 between the mounting base 21A and the front mounting portion 24 while is moved away small amount of the intermediate portion fixed position C and the rear portion fixed positions R A tensile load is applied and the separation between the intermediate portion fixing position C and the front portion fixing position F is constrained by the axial force A of the front side connecting portion main body 23 serving as a reaction force. On the other hand, the intermediate portion fixing position C and the rear portion fixing position R are separated from each other by the relative rise of the intermediate portion fixing position C, and a tensile load is applied to the rear connecting portion main body 26. The axial force A of the connecting portion main body 26 restrains the separation of the intermediate portion fixing position C and the rear portion fixing position R to suppress the bending of the side frame 10.

このとき、アッパクロスメンバ１６の上面１９上に結合される中間部２１から前側および後側に対向して連結される前側連結部２２と後側連結部２５には、それぞれ引張方向の軸力が作用し、中間部２１に作用する前側連結部２２の軸力と後側連結部２５の軸力が均衡して補剛部材２０が安定した状態に保持される。更に、前側連結部２２が傾斜部１０Ｂにおける内側縦壁１１に沿って延在しかつフランジ１１ａを介して内側縦壁１１に結合することで上下方向の曲げ剛性に優れた内側縦壁１１の剪断応力により前側連結部２２の軸力が効率的に作用し、かつ同様に後側連結部２５が後部１０Ｃのおける内側縦壁１１に沿って延在しかつフランジ１１ａを介して内側縦壁１１に結合することで内側縦壁１１の剪断応力により後側連結部２５の軸力が効率的に作用してサイドフレーム１０の曲げ変形が確実に抑制できる。   At this time, the axial force in the tensile direction is applied to each of the front side connecting portion 22 and the rear side connecting portion 25 connected to face the front side and the rear side from the intermediate portion 21 connected to the upper surface 19 of the upper cross member 16. The axial force of the front connecting part 22 acting on the intermediate part 21 and the axial force of the rear connecting part 25 are balanced and the stiffening member 20 is held in a stable state. Further, the front side connecting portion 22 extends along the inner vertical wall 11 in the inclined portion 10B and is coupled to the inner vertical wall 11 via the flange 11a, whereby the shearing of the inner vertical wall 11 having excellent bending rigidity in the vertical direction is achieved. The axial force of the front side connecting portion 22 acts efficiently by the stress, and similarly, the rear side connecting portion 25 extends along the inner vertical wall 11 in the rear portion 10C and is applied to the inner vertical wall 11 via the flange 11a. By joining, the axial force of the rear side connection part 25 acts efficiently by the shear stress of the inner vertical wall 11, and the bending deformation of the side frame 10 can be reliably suppressed.

さらに、アッパクロスメンバ１６の上面に結合される中間部２１の基部縦壁部２１Bが、サイドフレーム１０の内側縦壁１１と車幅方向において一致或いは略一致することで、補剛部材２０には基部縦壁部２１Bから前側連結部２２の内側縦壁部２３Ｂ及び後側連結部２５の内側縦壁部２６Ｂに亘る広範囲にサイドフレーム１０の曲げ方向に対する優れた抗力が確保できる縦壁が形成され、補剛部材２０の曲げ変形が確実に抑制されて補剛部材２０の軸力が効率的にサイドフレーム１０に作用してサイドフレーム１０の曲げ変形がより確実に抑制できる。   Furthermore, the base vertical wall portion 21B of the intermediate portion 21 coupled to the upper surface of the upper cross member 16 matches or substantially matches the inner vertical wall 11 of the side frame 10 in the vehicle width direction, so that the stiffening member 20 has A vertical wall that can ensure excellent resistance to the bending direction of the side frame 10 is formed over a wide range from the base vertical wall portion 21B to the inner vertical wall portion 23B of the front connection portion 22 and the inner vertical wall portion 26B of the rear connection portion 25. The bending deformation of the stiffening member 20 is reliably suppressed, and the axial force of the stiffening member 20 efficiently acts on the side frame 10 so that the bending deformation of the side frame 10 can be more reliably suppressed.

一方、サイドフレーム１０に、サイドフレーム１０の傾斜部１０Ｂの後端近傍乃至後部１０Ｃの前端近傍が相対的に下降するような曲げ変形が発生する際には、その初期段階において、補剛部材２０の取付基部２１Ａが取付固定されるアッパクロスメンバ１６の上面１９、詳細には中間部固定位置Ｃが、前部取付部２４が取り付けられる傾斜部１０Ｂの前部固定位置Ｆおよび後部取付部２７が取り付けられる後部１０Ｃの後部固定位置Ｒに対し相対的に微少量下降する。この中間部固定位置Ｃの相対的な下降により中間部固定位置Ｃと前部固定位置Ｆとが微少量接近して取付基部２１Ａと前部取付部２４との間の前側連結部本体２３には圧縮荷重が付与され、その反力となる前側連結部２２の軸力Ａによって中間部固定位置Ｃと前部固定位置Ｆの接近が拘束されて前部取付部２４が固定される傾斜部１０Ｂの後端近傍と取付基部２１Ａが固定されるアッパクロスメンバ１６の補剛部材取付部１９Ａとの間の相対的な接近を拘束して、同様に、中間部固定位置Ｃと後部固定位置Ｒとが微少量離反して取付基部２１Ａと後側取付部２７との間の後側連結部本体２６には引張荷重が付与され、その反力となる後側連結部２５の軸力Ａによって中間部固定位置Ｃと後部固定位置Ｒの接近を拘束してサイドフレーム１０の曲がりを抑制する。   On the other hand, when bending deformation occurs in the side frame 10 such that the vicinity of the rear end of the inclined portion 10B of the side frame 10 to the vicinity of the front end of the rear portion 10C is relatively lowered, the stiffening member 20 is in its initial stage. The upper surface 19 of the upper cross member 16 to which the mounting base portion 21A is mounted and fixed, specifically the intermediate portion fixing position C, the front fixing position F and the rear mounting portion 27 of the inclined portion 10B to which the front mounting portion 24 is mounted. The attached rear part 10C is slightly lowered relative to the rear fixing position R. Due to the relative lowering of the intermediate portion fixing position C, the intermediate portion fixing position C and the front portion fixing position F approach each other by a small amount so that the front side connecting portion main body 23 between the attachment base portion 21A and the front portion attachment portion 24 has The inclined portion 10B to which the front mounting portion 24 is fixed by restraining the approach between the intermediate portion fixing position C and the front portion fixing position F by the axial force A of the front side connecting portion 22 that is applied with a compressive load and becomes the reaction force. By restricting the relative approach between the vicinity of the rear end and the stiffening member mounting portion 19A of the upper cross member 16 to which the mounting base portion 21A is fixed, similarly, the intermediate portion fixing position C and the rear portion fixing position R are A slight load is applied to the rear connecting portion main body 26 between the mounting base portion 21A and the rear mounting portion 27 so that a tensile load is applied, and the intermediate portion is fixed by the axial force A of the rear connecting portion 25 which is the reaction force. The side frame 10 is restrained from approaching the position C and the rear fixing position R. To suppress the rising.

これに車両走行による切り返す入力されるサスペンション荷重Ｐによるサイドフレーム１０の上下方向の曲げが、補剛部材２０の軸力によって抑制され、サイドフレーム１０の上下曲げの減少に伴って、車体後部の振動が軽減される。   In addition, the vertical bending of the side frame 10 due to the input suspension load P turned back by the vehicle running is suppressed by the axial force of the stiffening member 20, and the vibration of the rear part of the vehicle body is reduced as the vertical bending of the side frame 10 decreases. Is reduced.

なお、本発明は上記実施の形態に限定されることなく、発明の趣旨を逸脱しない範囲で種々変形可能である。例えば、上記実施の形態では、補剛部材２０をサイドフレーム１０の内側縦壁１１に沿って延在し、フランジ１１ａに結合したが補剛部材２０を外側縦壁１２に沿って延在させ、フランジ１２ａに結合することもできる。

The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the invention. For example, in the above embodiment , the stiffening member 20 extends along the inner vertical wall 11 of the side frame 10 and is connected to the flange 11a, but the stiffening member 20 extends along the outer vertical wall 12, It can also be coupled to the flange 12a.

また、中間部２１をアッパクロスメンバ１６を介在してサイドフレーム１０に結合したが、他の車体部材を介してサイドフレームに結合することも、また直接的にサイドフレームに結合することもできる。   Moreover, although the intermediate part 21 was couple | bonded with the side frame 10 via the upper cross member 16, it can couple | bond with a side frame via another vehicle body member, or can couple | bond with a side frame directly.

更に上記実施の形態では補剛部材２０を、中間部２１と、前側連結部２２と、後側連結部２５とを一体に形成したが、分割して構成することもできる。すなわち、中間部が一体形成された前側連結部と、中間部が一体形成された後側連結部とによる２つの部材により構成することもできる。   Furthermore, although the stiffening member 20 is integrally formed with the intermediate portion 21, the front side connecting portion 22, and the rear side connecting portion 25 in the above-described embodiment, it can also be divided. That is, it can also be configured by two members including a front side connecting part integrally formed with the intermediate part and a rear side connecting part integrally formed with the intermediate part.

１０ サイドフレーム
１０Ａ 前部
１０Ｂ 傾斜部
１０Ｃ 後部
１１ 内側縦壁
１１ａ フランジ
１２ 外側縦壁
１２ａ フランジ
１６ アッパクロスメンバ（取付部材）
２０ 補剛部材
２１ 中間部
２１Ａ 取付基部
２１Ｂ 基部縦壁部
２２ 前側連結部
２３ 前側連結部本体
２４ 前部取付部
２５ 後側連結部
２６ 後側連結部本体
２７ 後部取付部
４０ サスペンション
４１ 緩衝装置
Ｃ 中間部固定位置
Ｆ 前部固定位置
Ｒ 後部固定位置
Ｐ サスペンション荷重入力点 DESCRIPTION OF SYMBOLS 10 Side frame 10A Front part 10B Inclined part 10C Rear part 11 Inner vertical wall 11a Flange 12 Outer vertical wall 12a Flange 16 Upper cross member (mounting member)
20 Stiffening member 21 Intermediate portion 21A Mounting base 21B Base vertical wall portion 22 Front side connecting portion 23 Front side connecting portion main body 24 Front side mounting portion 25 Rear side connecting portion 26 Rear side connecting portion main body 27 Rear portion attaching portion 40 Suspension 41 Shock absorber C Intermediate fixed position F Front fixed position R Rear fixed position P Suspension load input point

Claims (8)

車体下部両側に沿って前後方向に延在するとともにサスペンション荷重が入力されるサイドフレームと、該サイドフレームを補剛する補剛部材とを備えた車体後部構造において、
前記補剛部材は、
前記サイドフレームの上方に配設され且つ該サイドフレームの縦壁の位置のみで該縦壁に沿って該サイドフレームの伸長方向に一連に伸長し、前記サイドフレームに対して前後方向の３箇所で固定され、
前記３箇所の固定箇所の内、前部の固定位置と後部の固定位置は、前記サイドフレーム上部に設定され、中間部は前記前部と後部の固定高さ位置以上の高さで保持されるように前記サイドフレームに直接又は間接に固定され、
前記中間部の固定位置は、
前記サスペンション荷重入力点の車体前後方向位置に相当する位置に設定されたことを特徴とする車体後部構造。 In a vehicle body rear structure that includes a side frame that extends in the front-rear direction along both sides of the lower portion of the vehicle body and receives a suspension load, and a stiffening member that stiffens the side frame.
The stiffening member is
It is arranged above the side frame and extends in series in the extending direction of the side frame along the vertical wall only at the position of the vertical wall of the side frame, and at three positions in the front-rear direction with respect to the side frame. Fixed,
Among the three fixing points, the front fixing position and the rear fixing position are set at the upper part of the side frame, and the intermediate part is held at a height equal to or higher than the fixing height position of the front and rear parts. Fixed directly or indirectly to the side frame,
The fixing position of the intermediate part is
A vehicle body rear structure, wherein the suspension load input point is set at a position corresponding to a vehicle longitudinal direction position. 前記中間部の固定は、
前記サイドフレームの上部に設けられた所定高さの取付部材を介して行われ、
前記前部、後部の固定位置よりも高い位置で行われたことを特徴とする請求項１に記載の車体後部構造。 The fixing of the intermediate part is
It is carried out through a mounting member of a predetermined height provided on the upper part of the side frame,
The vehicle body rear part structure according to claim 1, wherein the rear part structure is performed at a position higher than a fixed position of the front part and the rear part. 前記取付部材として、
前記サスペンション荷重入力点の車体前後方向位置で、かつ前記サイドフレーム上方で車幅方向に延在して設けられたアッパクロスメンバが用いられたことを特徴とする請求項２に記載の車体後部構造。 As the mounting member,
The vehicle body rear part structure according to claim 2, wherein an upper cross member provided in the vehicle longitudinal direction position of the suspension load input point and extending in the vehicle width direction above the side frame is used. . 前記中間部の固定位置は
前記サスペンション荷重入力点に位置するサスペンションの緩衝装置取付部の車体前後方向位置に設定されたことを特徴とする請求項１〜３の何れか１項に記載の車体後部構造。 The vehicle body rear portion according to any one of claims 1 to 3, wherein the fixed position of the intermediate portion is set to a vehicle body longitudinal direction position of a suspension shock absorber mounting portion located at the suspension load input point. Construction. 前記前部の固定位置および後部の固定位置は、
前記サイドフレームの縦壁上端に形成されたフランジに設定されたことを特徴とする請求項１〜４の何れか１項に記載の車体後部構造 The front fixed position and the rear fixed position are:
The vehicle body rear part structure according to any one of claims 1 to 4, wherein the rear body structure is set to a flange formed at an upper end of a vertical wall of the side frame. 前記サイドフレームは、前方に移行するに従って下降する傾斜部を有し、
前記前部の固定位置は前記傾斜部に設定されたことを特徴とする請求項１〜５の何れか１項に記載の車体後部構造。 The side frame has an inclined portion that descends as it moves forward,
The vehicle body rear part structure according to any one of claims 1 to 5, wherein a fixed position of the front part is set to the inclined part. 前記補剛部材は、
前記中間部から前記前部まで延在する筒状の前側連結部と、前記中間部から前記後部まで延在する筒状の後側連結部とを備えたことを特徴とする請求項１〜６の何れか１項に記載の車体後部構造。 The stiffening member is
The cylindrical front side connection part extended from the said intermediate part to the said front part, and the cylindrical rear side connection part extended from the said intermediate part to the said rear part, The 1-6 characterized by the above-mentioned. The vehicle body rear structure according to any one of the above. 前記補剛部材は、
シート状板材を巻回して筒状に形成されたことを特徴とする請求項１〜７の何れか１項に記載の車体後部構造。 The stiffening member is
The vehicle body rear part structure according to any one of claims 1 to 7, wherein a sheet-like plate material is wound to form a cylindrical shape.
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