JP2004034877A - Power unit supporting structure of vehicle - Google Patents

Power unit supporting structure of vehicle Download PDF

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Publication number
JP2004034877A
JP2004034877A JP2002196680A JP2002196680A JP2004034877A JP 2004034877 A JP2004034877 A JP 2004034877A JP 2002196680 A JP2002196680 A JP 2002196680A JP 2002196680 A JP2002196680 A JP 2002196680A JP 2004034877 A JP2004034877 A JP 2004034877A
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Japan
Prior art keywords
power unit
mounting points
cross member
points
right front
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Pending
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JP2002196680A
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Japanese (ja)
Inventor
Yuichi Kuroda
黒田　裕一
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Subaru Corp
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Fuji Heavy Industries Ltd
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Priority to JP2002196680A priority Critical patent/JP2004034877A/en
Publication of JP2004034877A publication Critical patent/JP2004034877A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2204/00—Indexing codes related to suspensions per se or to auxiliary parts
    • B60G2204/10—Mounting of suspension elements
    • B60G2204/15—Mounting of subframes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2206/00—Indexing codes related to the manufacturing of suspensions: constructional features, the materials used, procedures or tools
    • B60G2206/01—Constructional features of suspension elements, e.g. arms, dampers, springs
    • B60G2206/014—Constructional features of suspension elements, e.g. arms, dampers, springs with reinforcing nerves or branches
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2206/00—Indexing codes related to the manufacturing of suspensions: constructional features, the materials used, procedures or tools
    • B60G2206/01—Constructional features of suspension elements, e.g. arms, dampers, springs
    • B60G2206/60—Subframe construction
    • B60G2206/605—Flexible constructions

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  • Arrangement Or Mounting Of Propulsion Units For Vehicles (AREA)
  • Body Structure For Vehicles (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To ensure high support rigidity in a support structure of a power unit and improve the control of dropping locus of a rear part of the power unit in a frontal collision. <P>SOLUTION: An X type cross member 4 having substantially X-shaped plane shape is used as a cross member supporting the rear part of the power unit 1. The X type cross member 4 is attached to side frames 2 on the left and right sides in four sections including left and right front side mounting points b, b and left and right rear side mounting points c, c for a power unit support point a of the X type cross member 4 by mounting bolts. Dropping load of the left and right front side mounting points b, b is set to be lower than dropping load of the left and right rear side mounting points c, c. The left and right front side mounting points b, b are previously broken and drop when front collision load is inputted. The X type cross member 4 turns downward centered on a line c-c connecting the left and right rear side mounting points or its vicinity. The rear part of the power unit 1 is securely displaced downward along controlled turn locus of the X type cross member. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は、車両のパワーユニット支持構造に関するものである。
【０００２】
【従来の技術】
エンジン及びトランスミッション等よりなる車両のパワーユニットは、通常その前部の左右部を左右のサイドフレームに左右のフロントマウントにより支持され、重心部又は後方部を左右のサイドフレーム間に掛け渡されたクロスメンバにリヤマウントにより支持された状態でエンジンルーム内に搭載されるのが普通である。
【０００３】
このような車両のパワーユニットの搭載構造において、近年、車両の安全対策の一つとして、前面衝突によりパワーユニットが後方へ移動した場合、パワーユニット後部を下方に変位させて、パワーユニット後部の車室内への侵入を回避するようにしたものが種々開発され、例えば特開平８−１０４２５４号公報や特開２０００−１１２６号公報等にて公開されている。
【０００４】
【発明が解決しようとする課題】
車両の前面衝突時にパワーユニット後部を下方に変位させる方策としては、衝突による車体前面の潰れ変形によりパワーユニットが後方へ変位した場合、パワーユニット後部を支持しているクロスメンバを車体（左右のサイドフレーム）から切り離し脱落させる（上記特開２０００−１１２６号公報参照）のが一般的である。
【０００５】
しかし、衝突荷重の入力によってクロスメンバを車体から切り離し自重にて脱落させるというだけでは、狙い通りの安定した脱落軌跡が得られにくい、という課題を有している。
【０００６】
又、前面衝突時の前部車体の圧潰にてパワーユニットの前部を上向きに押上げるよう構成することにより、パワーユニット後部に下向きの回転モーメントを与え、これによりパワーユニット後部の車室内への侵入を回避するというもの（上記特開平８−１０４２５４号公報参照）も従来よりあるが、この場合はパワーユニットの後部支持部をパワーユニットの重心位置近傍に位置させなければならないので、通常時のパワーユニットの後部支持が不安定となる上に、衝突時の前部車体の圧潰変形の予測が困難で、パワーユニット前端部に上向きの力を確実に付与すべき車体前部構造の設定が難しい、という課題を有している。
【０００７】
本発明は上記のような従来の課題を解決することを目的とするものである。
【０００８】
【課題を解決するための手段】
本発明は、パワーユニットを支持するクロスメンバとして、左右の前側取付点と左右の後側取付点との左右前後４箇所で左右の車体（例えばサイドフレーム）に取付ボルト等で取付けられるクロスメンバであって、上記左右の後側取付点を結ぶ線より前方にパワーユニット支持点を有し、且つ上記左右の後側取付点間で上記パワーユニット支持点の後側に切欠きを有するもの、例えば平面形状がほぼＸ字形をなすクロスメンバを用いたことにより、通常時におけるパワーユニットの例えば後部マウント部として高い支持剛性が確保され、走行時の慣性力等の入力に対するパワーユニットの揺れ等を最小限に抑えることができるようにすると共に、このクロスメンバの上記左右前後の４箇所の取付点のうち、左右の前側取付点の少なくとも一方の脱落荷重を左右の後側取付点の脱落荷重より低く設定したことにより、前面衝突荷重の入力時は左右の前側取付点が左右の後側取付点より先に破断脱落し、クロスメンバは左右の後側取付点を結ぶ線或はその近傍付近を中心として下向きに回動し、パワーユニット後部も上記クロスメンバ後部の切欠きに嵌りながらコントロールされた回動軌跡に沿って下方へと確実に変位し、パワーユニットの後方移動による車室内への侵入は的確に回避されるものである。
【０００９】
【発明の実施の形態】
以下、本発明の実施の形態に付き、図面を参照して説明する。
【００１０】
図１（Ａ）は本発明の一実施例を示す概略側面図であり、１はエンジン及びトランスミッション等よりなるパワーユニットで、該パワーユニット１の前部は左右のサイドフレーム２にフロントマウント３により支持される。尚、該フロントマウント３は従来より公知の任意の構成のものを採用できるので、詳しい図示及び説明は省略する。
【００１１】
パワーユニット１の後部は、左右のサイドフレーム２，２に掛け渡された平面形状がほぼＸ字型をなすＸ型クロスメンバ４のほぼ中央の支持部４ａに結合支持される。
【００１２】
Ｘ型クロスメンバ４は、図１（Ａ）及び（Ｂ）に示すように、ほぼ中央の支持部４ａの左右両側に、左右の前側腕部４ｂ，４ｂと左右の後側腕部４ｃ，４ｃとが延設された構造のほぼＸ型の平面形状に構成され、前側腕部４ｂ，４ｂと後側腕部４ｃ，４ｃの各左右端部で左右のサイドフレーム２，２に取付ボルト５ｂ，５ｃにて締付固定される。上記Ｘ型クロスメンバ４は箱形断面部材にて一体に構成される。
【００１３】
このＸ型クロスメンバ４の左右サイドフレーム２，２への前側左右の取付点をｂ，ｂとし、後側左右の取付点をｃ，ｃとし、Ｘ型クロスメンバ４のパワーユニット１後部の支持点をａとすると、支持点ａはＸ型クロスメンバ４の後側取付点ｃ−ｃより距離ｄだけ前方に位置するよう構成される。又、支持点ａは前側取付点ｂ−ｂより距離ｄ′だけ後方に位置し、上記距離ｄとｄ′はｄ≧ｄ′となるよう設定することが望ましい。
【００１４】
上記前側取付点ｂ，ｂと後側取付点ｃ，ｃとの左右前後４点のサイドフレーム２，２への取付点において、破壊脱落する荷重すなわち脱落荷重は、前側取付点ｂ，ｂの脱落荷重が後側取付点ｃ，ｃの脱落荷重より低く設定され、前面衝突荷重の入力により前部車体が圧潰変形しパワーユニット１が後方へ変位するような場合、その荷重により前側取付点ｂ，ｂが後側取付点ｃ，ｃよりも先に脱落するするよう構成される。
【００１５】
前側取付部ｂ，ｂの脱落荷重を後側取付点ｃ，ｃより低く設定するための具体的手段としては、前側取付部４ｂを車体（サイドフレーム２）へ締付固定する前側取付ボルト５ｂの破断強度を、後側取付部４ｃの締付固定用の後側取付ボルト５ｃの破断強度より弱くする。そのためには、例えば、前側取付ボルト５ｂのボルト径を後側取付ボルト５ｃのボルト径より小さいものとするとか、或は前側取付ボルト５ｂに部分的な切欠き等を設けて剪断し易い構造とすることが考えられる。
【００１６】
上記取付ボルト５ｂの破断強度を弱くする代わりに、Ｘ型クロスメンバ４の前側腕部４ｂの前側取付ボルト５ｂによる締付固定部の板厚強度を後側腕部４ｃの締付固定部の板厚強度より弱くして、荷重入力により前側腕部４ｂの締付固定部が後側腕部４ｃより先に破断して脱落する構造としてもよい。
【００１７】
又、図３（Ａ）に示すように、前側腕部４ｂの取付ボルト穴４ｂ′の逃げ穴の径を後側腕部４ｃのもの４ｃ′より大きくするとか、或は図３（Ｂ）に示すように、前側腕部４ｂの取付ボルト穴４ｂ′部に切欠部４ｂ″を設けておくことにより、前面衝突荷重入力にて前側腕部４ｂの取付ボルト穴４ｂ′部が後側腕部４ｃより先に破断して脱落する構成としても良い。
【００１８】
尚、図１において、６はエンジンルームと車室とを仕切るトーボード、７はフロントフロアであり、パワーユニット１はエンジンルーム内からフロントフロア７の中央部に形成したセンタトンネル部７ａの下側にかけて配置搭載されるものであり、前記Ｘ型クロスメンバ４はセンタトンネル部７ａの下側を跨ぐように配設される。
【００１９】
上記の構成において、前面衝突時以外の通常時は、パワーユニット１の後部はＸ型クロスメンバ４の左右の前側取付点ｂ，ｂと左右の後側取付点ｃ，ｃとの４点で左右の車体（サイドフレーム）に支持され、前後の取付点ｂ−ｃ間に充分大きな距離をもたせることができるので、高い支持剛性が確保され、走行時の慣性力等の入力に対するパワーユニット１の揺れ等を最小限に抑えることができる。
【００２０】
前面衝突時の荷重入力により前部車体が圧潰変形しパワーユニット１が後方へ変位すると、その荷重により先ず前側取付点ｂ，ｂの締結が破断する。すると、後側取付点ｃより前方に位置する支持点ａにパワーユニット１後部の重量がかかっているので、図４に示すように、Ｘ型クロスメンバ４は後側取付点ｃ−ｃまわりに下向きに回動し、パワーユニット１の後部はＸ型クロスメンバ４の左右の後側腕部４ｃと４ｃとの間に形成される切欠き４ｄ内に嵌り込みつつ支持点ａの回動軌跡に沿って下方へ変位し、パワーユニット１の後方移動による車室内への侵入は的確に回避される。
【００２１】
後側取付点ｃ，ｃの具体的構成として、後側腕部４ｃの先端部分をサイドフレーム２の下面部に直接又は他部材を介して接合し、それを後側取付ボルト５ｃで締付固定する構成を採用した場合は、前側取付点ｂ，ｂが破断するとＸ型クロスメンバ１は後側腕部の先端の接合部分近傍で屈折変形して下向きに回動するが、図２に示すように、後側腕部４ｃ，４ｃを左右の後側取付点を結ぶ線ｃ−ｃに一致する回動軸５１で回動可能なるようサイドフレーム２，２に取り付けた構造とすれば、前記のように前側取付点ｂ，ｂが破断するとＸ側クロスメンバ４は上記回動軸５１，５１を中心としてスムーズに下向きに回動し、パワーユニット１後部の車室内への侵入はより的確に回避される。
【００２２】
図２において、（Ａ）はＸ型クロスメンバの後側腕部４ｃの端部を回動軸５１により直接軸着する例を示し、（Ｂ）は後側腕部４ｃの端部の回動軸５１による軸着部にゴムブッシュ５２を介装した例を示している。
【００２３】
尚、本発明において、Ｘ型クロスメンバ４は、図１及び図２の形状・構造に限定されることなく、例えば図５に示すように、左側及び右側で前後の腕部が分岐せずに一体に形成された平面形状のものも本発明のＸ型クロスメンバ４のなかに含むものとする。
【００２４】
図５において、図１と同一の符号は図１と同じ部分を表すものであり、ａはパワーユニット１の支持点、ｂ，ｂは左右の前側取付点、ｃ，ｃは左右の後側取付点を示し、上記前側取付点ｂ，ｂと後側取付点ｃ，ｃとの左右前後４点のサイドフレーム２，２への取付点において、前側取付点ｂ，ｂの脱落荷重が後側取付点ｃ，ｃの脱落荷重より低く設定され、前面衝突荷重の入力により前部車体が圧潰変形しパワーユニット１が後方へ変位するような場合、その荷重により前側取付点ｂ，ｂが後側取付点ｃ，ｃよりも先に脱落し、Ｘ型クロスメンバ４は後側取付点ｃ−ｃまわりに下向きに回動し、パワーユニット１の後部も切欠き４ｄに嵌り込みつつ支持点ａの回動軌跡に沿って下方へ変位し、パワーユニット１の後方移動による車室内への侵入は的確に回避されるという作用，効果においても上記図１〜３の実施例と同じである。
【００２５】
更に本発明では、上記のような平面形状がほぼＸ字形をなすＸ型クロスメンバ４に限らず、左右の前側取付点ｂ，ｂと左右の後側取付点ｃ，ｃとの左右前後４箇所で左右の車体に取付ボルト等で取付けられるクロスメンバであって、上記左右の後側取付点を結ぶ線ｃ−ｃより前方にパワーユニット支持点ａを有し、且つ上記左右の後側取付点ｃ，ｃ間で上記パワーユニット支持点ａの後側に、前側取付点ｂ，ｂの脱落時にパワーユニットの後部が嵌りながら下方へ変位するための切欠き４ｄを有する任意形状のクロスメンバを用いることができる。
【００２６】
又、上記実施例では、左右の前側支持点ｂ，ｂの脱落荷重を左右の後側支持点ｃ，ｃの脱落荷重より低くした例を示しているが、左右の前側支持点ｂ，ｂのうちの何れか一方の脱落荷重のみをその他の支持点の脱落荷重より低くした構成としても良い。
【００２７】
【発明の効果】
以上のように本発明によれば、パワーユニット支持用のクロスメンバとして、左右の前側取付点と左右の後側取付点との左右前後４箇所で左右の車体（例えばサイドフレーム）に取付ボルト等で取付けられるクロスメンバであって、上記左右の後側取付点を結ぶ線より前方にパワーユニット支持点を有し、且つ上記左右の後側取付点間で上記パワーユニット支持点の後側に切欠きを有するもの、例えば平面形状がほぼＸ字型をなすクロスメンバを用いたことにより、通常時においてはパワーユニットの支持部として高い支持剛性及び耐久性が確保され、走行時の慣性力等の入力に対するパワーユニットの揺れ等を最小限に抑えることができる。
【００２８】
更に、上記クロスメンバの左右の前側取付点と左右の後側取付点との左右前後の４箇所の取付点のうち、左右の前側取付点の少なくとも一方の脱落荷重を左右の後側取付点の脱落荷重より低く設定したことにより、前面衝突荷重の入力時は左右の前側取付点が先に破断脱落し、上記クロスメンバは左右の後側取付点を結ぶ線或はその近傍付近を中心として下向きに回動し、パワーユニット後部も上記クロスメンバ後部の切欠きに嵌り込みつつコントロールされた回動軌跡に沿って下方へと確実に変位し、パワーユニットの後方移動による車室内への侵入は的確に回避されるもので、構造簡単でコスト低廉なることと相俟って、実用上多大の効果をもたらし得るものである。
【図面の簡単な説明】
【図１】本発明の一実施例を示すもので、（Ａ）は一部を断面にて示すパワーユニット支持構造の概略側面図、（Ｂ）はＸ型クロスメンバを斜め上方より見た斜視図である。
【図２】（Ａ）及び（Ｂ）はＸ型クロスメンバの後側取付点の具体的構造例をそれぞれ示す斜視図である。
【図３】（Ａ）及び（Ｂ）はＸ型クロスメンバの前側取付点と後側取付点の他の実施例をそれぞれ示す平面図である。
【図４】車両の前面衝突時のパワーユニットの後部支持部の脱落態様を説明する側面概略図である。
【図５】Ｘ型クロスメンバの他の例を示す平面説明図である。
【符号の説明】
１　　　パワーユニット
２　　　サイドフレーム
３　　　フロントマウント
４　　　Ｘ型クロスメンバ
４ａ　　支持部
４ｂ　　前側腕部
４ｃ　　後側腕部
４ｄ　　切欠き
５ｂ　　前側取付ボルト
５ｃ　　後側取付ボルト
６　　　トーボード
７　　　フロントフロア
７ａ　　センタトンネル部
５１　　回動軸
５２　　ゴムブッシュ
ａ　　　パワーユニットの支持点
ｂ　　　前側取付点
ｃ　　　後側取付点[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a power unit support structure for a vehicle.
[0002]
[Prior art]
A power unit of a vehicle including an engine, a transmission, etc. is a cross member in which the left and right front portions are normally supported by left and right front mounts on the left and right side frames, and the center of gravity or the rear portion is bridged between the left and right side frames. It is usually mounted in the engine room while being supported by the rear mount.
[0003]
In recent years, in such a vehicle power unit mounting structure, as one of the safety measures of the vehicle, when the power unit moves rearward due to a frontal collision, the rear of the power unit is displaced downward, and the rear of the power unit enters the passenger compartment. A variety of methods have been developed to avoid this problem, and are disclosed in, for example, JP-A-8-104254 and JP-A-2000-1126.
[0004]
[Problems to be solved by the invention]
As a measure to displace the rear part of the power unit downward at the time of a frontal collision of the vehicle, when the power unit is displaced rearward due to the crushing deformation of the front of the vehicle body due to the collision, the cross member supporting the rear part of the power unit is moved from the vehicle body (left and right side frames) It is common to separate and drop (see JP-A-2000-1126).
[0005]
However, there is a problem that it is difficult to obtain a desired stable trajectory only by separating the cross member from the vehicle body by its own weight by inputting the collision load.
[0006]
In addition, by configuring the front of the power unit to be pushed upward by the crush of the front body at the time of a frontal collision, a downward turning moment is given to the rear of the power unit, thereby preventing the rear of the power unit from entering the passenger compartment. (See Japanese Patent Application Laid-Open No. 8-104254), however, in this case, the rear support of the power unit must be located near the position of the center of gravity of the power unit. In addition to being unstable, it is difficult to predict the crushing deformation of the front vehicle body at the time of collision, and it is difficult to set the vehicle body front structure that should reliably apply an upward force to the front end of the power unit. I have.
[0007]
An object of the present invention is to solve the conventional problems as described above.
[0008]
[Means for Solving the Problems]
The present invention relates to a cross member which is mounted on a left and right vehicle body (for example, a side frame) at four positions on the left and right sides of a front mounting point on the left and right and a rear mounting point on the left and right with mounting bolts as a cross member for supporting the power unit. A power unit supporting point in front of a line connecting the left and right rear mounting points, and a notch on the rear side of the power unit supporting point between the left and right rear mounting points, for example, a planar shape. By using a cross member having an almost X shape, a high support rigidity is secured as a rear mount portion of the power unit in a normal state, for example, and it is possible to minimize the swing of the power unit with respect to an input such as an inertia force during traveling. And at least one of the left and right front mounting points among the four mounting points on the left, right, front and rear of the cross member. By setting the falling load to be lower than the falling load at the left and right rear mounting points, when a frontal collision load is input, the left and right front mounting points break before the left and right rear mounting points, and the cross members are left and right. The power unit rotates downward around the line connecting the rear mounting point or the vicinity thereof, and the rear part of the power unit is also displaced downward along the controlled rotation trajectory while fitting in the notch at the rear part of the cross member. The intrusion into the passenger compartment due to the rearward movement of the power unit is properly avoided.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0010]
FIG. 1A is a schematic side view showing one embodiment of the present invention. Reference numeral 1 denotes a power unit including an engine, a transmission, and the like. The front part of the power unit 1 is supported by left and right side frames 2 by a front mount 3. You. Since the front mount 3 can have any conventionally known configuration, detailed illustration and description are omitted.
[0011]
The rear portion of the power unit 1 is supported by being coupled to a substantially central support portion 4a of an X-shaped cross member 4 having a substantially X-shaped planar shape extending over the left and right side frames 2 and 2.
[0012]
As shown in FIGS. 1A and 1B, the X-shaped cross member 4 has left and right front arms 4b, 4b and left and right rear arms 4c, 4c on the left and right sides of a substantially central support portion 4a. Are formed in a substantially X-shaped planar shape having an extended structure, and the left and right ends of the front arm portions 4b, 4b and the rear arm portions 4c, 4c are attached to the left and right side frames 2, 2 with mounting bolts 5b, It is tightened and fixed at 5c. The X-shaped cross member 4 is integrally formed by a box-shaped cross-section member.
[0013]
The left and right attachment points of the X-type cross member 4 to the left and right side frames 2 and 2 are denoted by b and b, and the rear left and right attachment points are denoted by c and c. Let a be a, and the support point a is configured to be located a distance d ahead of the rear attachment point c-c of the X-shaped cross member 4. Further, it is desirable that the supporting point a is located behind the front mounting point bb by a distance d ', and the distances d and d' are set so that d ≧ d '.
[0014]
At the four attachment points to the side frames 2 and 2 between the front attachment points b and b and the rear attachment points c and c on the left and right sides, the load that breaks and falls, that is, the falling load, is the drop of the front attachment points b and b. When the load is set lower than the load at which the rear mounting points c, c are dropped, and the front vehicle body is crushed and deformed by the input of the frontal collision load, and the power unit 1 is displaced rearward, the front mounting points b, b Are configured to drop before the rear mounting points c, c.
[0015]
As a specific means for setting the falling load of the front mounting portions b, b lower than the rear mounting points c, c, a front mounting bolt 5b for tightening and fixing the front mounting portion 4b to the vehicle body (side frame 2) is used. The breaking strength is made weaker than the breaking strength of the rear mounting bolt 5c for tightening and fixing the rear mounting portion 4c. For this purpose, for example, the bolt diameter of the front mounting bolt 5b is set to be smaller than the bolt diameter of the rear mounting bolt 5c, or the front mounting bolt 5b is provided with a partial notch or the like to easily shear. It is possible to do.
[0016]
Instead of weakening the breaking strength of the mounting bolt 5b, the thickness of the fastening portion of the front arm 4b of the X-shaped cross member 4 tightened by the front mounting bolt 5b is changed to the plate of the fastening portion of the rear arm 4c. The thickness may be weaker than the strength, and a structure may be employed in which the fastening portion of the front arm 4b breaks and falls off before the rear arm 4c by a load input.
[0017]
Also, as shown in FIG. 3A, the diameter of the clearance hole of the mounting bolt hole 4b 'of the front arm 4b is made larger than that of the rear arm 4c 4c', or as shown in FIG. As shown, the notch 4b "is provided in the mounting bolt hole 4b 'of the front arm 4b so that the mounting bolt hole 4b' of the front arm 4b is changed to the rear arm 4c by the frontal collision load input. It is good also as a structure which fracture | ruptures earlier and falls off.
[0018]
In FIG. 1, reference numeral 6 denotes a toe board for separating an engine room and a passenger compartment, 7 denotes a front floor, and the power unit 1 is arranged from the inside of the engine room to a lower side of a center tunnel portion 7a formed at the center of the front floor 7. The X-type cross member 4 is mounted so as to straddle the lower side of the center tunnel portion 7a.
[0019]
In the above-described configuration, in a normal state other than the time of a frontal collision, the rear portion of the power unit 1 is left and right at four points of the left and right front mounting points b and b and the left and right rear mounting points c and c of the X-shaped cross member 4. Since it is supported by the vehicle body (side frame) and can have a sufficiently large distance between the front and rear mounting points bc, high support rigidity is secured, and the power unit 1 shakes with respect to input of inertia force or the like during traveling. Can be minimized.
[0020]
When the front vehicle body is crushed and deformed by a load input at the time of a frontal collision and the power unit 1 is displaced rearward, first, the fastening of the front mounting points b, b is broken by the load. Then, since the weight of the rear part of the power unit 1 is applied to the support point a located forward of the rear mounting point c, as shown in FIG. 4, the X-shaped cross member 4 is directed downward around the rear mounting point c-c. The rear part of the power unit 1 fits into a notch 4d formed between the left and right rear arms 4c of the X-shaped cross member 4 and follows the rotation locus of the support point a while being fitted into a notch 4d. The power unit 1 is displaced downward, and the intrusion into the vehicle interior due to the backward movement of the power unit 1 is accurately avoided.
[0021]
As a specific configuration of the rear mounting points c, c, the distal end portion of the rear arm 4c is joined to the lower surface of the side frame 2 directly or via another member, and it is tightened and fixed with the rear mounting bolt 5c. When the front mounting points b, b are broken, the X-shaped cross member 1 bends and deforms in the vicinity of the joint portion at the tip of the rear arm, and rotates downward as shown in FIG. In addition, if the rear arm portions 4c, 4c are attached to the side frames 2, 2 so as to be rotatable about a rotation shaft 51 corresponding to a line cc connecting the left and right rear attachment points, When the front mounting points b, b are broken, the X-side cross member 4 smoothly rotates downward around the rotation shafts 51, 51, and the intrusion of the rear part of the power unit 1 into the vehicle interior is more accurately avoided. You.
[0022]
2A shows an example in which the end of the rear arm 4c of the X-shaped cross member is directly mounted on the rotation shaft 51, and FIG. 2B shows the rotation of the end of the rear arm 4c. An example is shown in which a rubber bush 52 is interposed in a shaft attachment portion of the shaft 51.
[0023]
In the present invention, the X-shaped cross member 4 is not limited to the shape and structure shown in FIGS. 1 and 2 and, for example, as shown in FIG. An X-shaped cross member 4 of the present invention includes a planar shape integrally formed.
[0024]
5, the same reference numerals as those in FIG. 1 denote the same parts as those in FIG. 1, a is a support point of the power unit 1, b and b are right and left front mounting points, and c and c are right and left rear mounting points. The front mounting points b, b and the rear mounting points c, c, at four mounting points on the left and right, front and rear, to the side frames 2, 2, the falling load of the front mounting points b, b is changed to the rear mounting point. When the front body is crushed and deformed by the input of the frontal collision load and the power unit 1 is displaced rearward, the front mounting points b and b are set to be lower than the rear mounting point c by the input of the frontal collision load. , C, the X-shaped cross member 4 pivots downward around the rear mounting point c-c, and the rear part of the power unit 1 also fits into the notch 4d and follows the rotational locus of the support point a. Along with the power unit 1 and the rearward movement of the power unit 1 The effect that is precisely avoided, also the same as the embodiment of FIG 1 to 3 in effect.
[0025]
Further, the present invention is not limited to the X-shaped cross member 4 having a substantially X-shaped planar shape as described above. And a power member support point a ahead of a line cc connecting the left and right rear mounting points, and a left and right rear mounting point c , C, the rear side of the power unit support point a, a cross member of any shape having a cutout 4d for displacing the rear part of the power unit downward when the front mounting points b, b fall off can be used. .
[0026]
Further, in the above embodiment, an example is shown in which the left and right front support points b, b are lower in dropping load than the left and right rear support points c, c. A configuration may be adopted in which only one of the falling loads is lower than the falling loads of the other support points.
[0027]
【The invention's effect】
As described above, according to the present invention, as a cross member for supporting the power unit, the mounting bolts or the like are attached to the left and right vehicle bodies (for example, side frames) at four locations on the left, right, front and rear between the left and right front mounting points and the left and right rear mounting points. A cross member to be attached, having a power unit support point in front of a line connecting the left and right rear attachment points, and a notch behind the power unit support point between the left and right rear attachment points. For example, by using a cross member having a substantially X-shaped planar shape, a high support rigidity and durability are secured as a support portion of the power unit in a normal state, and the power unit responds to an input such as an inertia force during traveling. Shaking and the like can be minimized.
[0028]
Further, of the four mounting points on the left and right and front and rear between the left and right front mounting points and the left and right rear mounting points of the cross member, at least one of the left and right front mounting points is dropped by the left and right rear mounting points. By setting it lower than the drop-off load, when a frontal collision load is input, the left and right front mounting points break and fall off first, and the cross member faces downward around the line connecting the left and right rear mounting points or its vicinity. The rear of the power unit fits into the notch at the rear of the cross member, and is securely displaced downward along the controlled rotation trajectory, preventing the power unit from moving backwards into the passenger compartment. In addition to the simple structure and the low cost, it is possible to bring a great effect in practical use.
[Brief description of the drawings]
1A and 1B show an embodiment of the present invention, in which FIG. 1A is a schematic side view of a power unit supporting structure partially shown in cross section, and FIG. 1B is a perspective view of an X-shaped cross member viewed from obliquely above. It is.
FIGS. 2A and 2B are perspective views each showing a specific structure example of a rear attachment point of an X-shaped cross member.
FIGS. 3A and 3B are plan views showing another embodiment of a front mounting point and a rear mounting point of an X-shaped cross member, respectively.
FIG. 4 is a schematic side view illustrating a manner in which a rear support portion of a power unit is dropped when a frontal collision of the vehicle occurs.
FIG. 5 is an explanatory plan view showing another example of the X-shaped cross member.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 power unit 2 side frame 3 front mount 4 X-shaped cross member 4a support 4b front arm 4c rear arm 4d notch 5b front mounting bolt 5c rear mounting bolt 6 toe board 7 front floor 7a center tunnel 51 rotating shaft 52 Rubber bush a Power unit support point b Front mounting point c Rear mounting point

Claims (6)

パワーユニットを支持するクロスメンバとして、左右の前側取付点と左右の後側取付点との左右前後４箇所で左右の車体に取付ボルト等で取付けられるクロスメンバであって、上記左右の後側取付点を結ぶ線より前方にパワーユニット支持点を有し、且つ上記左右の後側取付点間で上記パワーユニット支持点の後側に切欠きを有するものを用い、このクロスメンバの上記左右前後の４箇所の取付点のうち、左右の前側取付点の少なくとも一方の脱落荷重を左右の後側取付点の脱落荷重より低く設定し、前面衝突荷重の入力時に左右の前側取付点が左右の後側取付点より先に破断脱落し、クロスメンバが左右の後側取付点を結ぶ線又はその近傍付近を中心として下向きに回動するよう構成したことを特徴とする車両のパワーユニット支持構造。Cross members for supporting the power unit, which are mounted on left and right vehicle bodies with mounting bolts and the like at four positions on the left and right front and rear of the left and right front mounting points and the left and right rear mounting points. And a notch on the rear side of the power unit support point between the left and right rear attachment points, and the cross member has four front, rear, right and left positions. At least one of the left and right front mounting points among the mounting points is set lower than the left and right rear mounting points, so that the left and right front mounting points are higher than the left and right rear mounting points when a frontal collision load is input. A power unit support structure for a vehicle, wherein the cross member is broken down first, and the cross member is pivoted downward about a line connecting the left and right rear mounting points or a vicinity thereof. 請求項１に記載の車両のパワーユニット支持構造において、クロスメンバは、ほぼＸ字形の平面形状を有するＸ型クロスメンバであることを特徴とする車両のパワーユニット支持構造。2. The power unit support structure for a vehicle according to claim 1, wherein the cross member is an X-shaped cross member having a substantially X-shaped planar shape. 請求項１又は２に記載の車両のパワーユニット支持構造において、左右の前側取付点を車体に取付ける左右の前側取付ボルトの少なくとも一方の破断強度を、左右の後側取付点を車体に取付ける後側取付ボルトの破断強度より弱く設定し、前面衝突荷重の入力時に左右の前側取付ボルトが先に破断して左右の前側取付点が左右の後側取付点より先に脱落するよう構成したことを特徴とする車両のパワーユニット支持構造。3. The vehicle power unit support structure according to claim 1, wherein at least one of the left and right front mounting bolts for mounting the left and right front mounting points to the vehicle body has a breaking strength, and the left and right rear mounting points are mounted to the vehicle body for rear mounting. It is set to be weaker than the rupture strength of the bolt, so that when a frontal collision load is input, the left and right front mounting bolts break first and the left and right front mounting points drop off before the left and right rear mounting points. Power unit support structure of the vehicle to be driven. 請求項１又は２に記載の車両のパワーユニット支持構造において、クロスメンバの左右の前側取付点部の少なくとも一方の板厚強度を左右の後側取付点部の板厚強度より弱くし、前面衝突荷重の入力時に上記クロスメンバの左右の前側取付点部が左右の後側取付点部より先に破断脱落するよう構成したことを特徴とする車両のパワーユニット支持構造。3. The vehicle power unit support structure according to claim 1, wherein the thickness of at least one of the left and right front attachment points of the cross member is made weaker than the thickness of the left and right rear attachment points, and a frontal collision load is applied. A power unit support structure for a vehicle, wherein the left and right front attachment points of the cross member are broken and dropped before the left and right rear attachment points when the input is performed. 請求項１又は２に記載の車両のパワーユニット支持構造において、クロスメンバの左右の前側取付点部の少なくとも一方の取付ボルト穴の逃げ穴径を左右の後側取付点部のものより大きくし、前面衝突荷重の入力時に上記クロスメンバの左右の前側取付点部の取付ボルト穴部が先に破断して、左右の前側取付点が左右の後側取付点より先に脱落するよう構成したことを特徴とする車両のパワーユニット支持構造。3. The power unit support structure for a vehicle according to claim 1, wherein at least one of the left and right front mounting points of the cross member has a relief hole diameter larger than that of the left and right rear mounting points. When a collision load is input, the mounting bolt holes at the left and right front mounting points of the cross member are broken first, and the left and right front mounting points are dropped before the left and right rear mounting points. Vehicle power unit support structure. 請求項１又は２に記載の車両のパワーユニット支持構造において、クロスメンバの左右の前側取付点部の少なくとも一方の取付ボルト穴に切欠部を設け、前面衝突荷重の入力時にＸ型クロスメンバの左右の前側取付点部の取付ボルト穴部が先に破断して、左右の前側取付点が左右の後側取付点より先に脱落するよう構成したことを特徴とする車両のパワーユニット支持構造。3. The power unit supporting structure for a vehicle according to claim 1, wherein at least one of the left and right front mounting points of the cross member is provided with a notch, and a left and right X-shaped cross member is provided when a frontal collision load is input. A power unit support structure for a vehicle, wherein a mounting bolt hole at a front mounting point portion is broken first, and left and right front mounting points are dropped before left and right rear mounting points.
JP2002196680A 2002-07-05 2002-07-05 Power unit supporting structure of vehicle Pending JP2004034877A (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100783532B1 (en) * 2006-12-08 2007-12-07 현대자동차주식회사 Stiff bar
EP2189317A1 (en) * 2008-11-21 2010-05-26 Peugeot Citroen Automobiles SA Engine mount with pre-weakend point
US8915326B2 (en) 2012-05-10 2014-12-23 Audi Ag Axle beam arrangement on a vehicle, in particular on a motor vehicle
CN104875596A (en) * 2015-05-12 2015-09-02 奇瑞汽车股份有限公司 Automotive power-train suspending device
JP2018099918A (en) * 2016-12-19 2018-06-28 トヨタ自動車株式会社 Fuel cell vehicle
JP2019064438A (en) * 2017-09-29 2019-04-25 スズキ株式会社 Support structure of shift device
JP2019064440A (en) * 2017-09-29 2019-04-25 スズキ株式会社 Support structure of transfer device
JP2019064439A (en) * 2017-09-29 2019-04-25 スズキ株式会社 Support structure for shift device
JP2019064436A (en) * 2017-09-29 2019-04-25 スズキ株式会社 Mount structure of power unit

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100783532B1 (en) * 2006-12-08 2007-12-07 현대자동차주식회사 Stiff bar
EP2189317A1 (en) * 2008-11-21 2010-05-26 Peugeot Citroen Automobiles SA Engine mount with pre-weakend point
FR2938798A1 (en) * 2008-11-21 2010-05-28 Peugeot Citroen Automobiles Sa PROGRAMMED RUPTURE MOTOR PUMPS SUPPORT FIXED TO A SIDE OF A MOTOR VEHICLE
US8915326B2 (en) 2012-05-10 2014-12-23 Audi Ag Axle beam arrangement on a vehicle, in particular on a motor vehicle
CN104875596A (en) * 2015-05-12 2015-09-02 奇瑞汽车股份有限公司 Automotive power-train suspending device
JP2018099918A (en) * 2016-12-19 2018-06-28 トヨタ自動車株式会社 Fuel cell vehicle
JP2019064438A (en) * 2017-09-29 2019-04-25 スズキ株式会社 Support structure of shift device
JP2019064440A (en) * 2017-09-29 2019-04-25 スズキ株式会社 Support structure of transfer device
JP2019064439A (en) * 2017-09-29 2019-04-25 スズキ株式会社 Support structure for shift device
JP2019064436A (en) * 2017-09-29 2019-04-25 スズキ株式会社 Mount structure of power unit

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