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JP3765249B2 - Car tow hook mounting structure - Google Patents

Car tow hook mounting structure Download PDF

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Publication number
JP3765249B2
JP3765249B2 JP2001188577A JP2001188577A JP3765249B2 JP 3765249 B2 JP3765249 B2 JP 3765249B2 JP 2001188577 A JP2001188577 A JP 2001188577A JP 2001188577 A JP2001188577 A JP 2001188577A JP 3765249 B2 JP3765249 B2 JP 3765249B2
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Japan
Prior art keywords
stay
hook
bumper
end wall
wall
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JP2003002136A (en
Inventor
泰浩 登坂
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Nissan Motor Co Ltd
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Nissan Motor Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60D—VEHICLE CONNECTIONS
    • B60D1/00—Traction couplings; Hitches; Draw-gear; Towing devices
    • B60D1/48—Traction couplings; Hitches; Draw-gear; Towing devices characterised by the mounting
    • B60D1/488—Traction couplings; Hitches; Draw-gear; Towing devices characterised by the mounting mounted directly to the chassis of the towing vehicle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60D—VEHICLE CONNECTIONS
    • B60D1/00—Traction couplings; Hitches; Draw-gear; Towing devices
    • B60D1/24—Traction couplings; Hitches; Draw-gear; Towing devices characterised by arrangements for particular functions
    • B60D1/243—Traction couplings; Hitches; Draw-gear; Towing devices characterised by arrangements for particular functions for protection in case of crash, collision, impact, or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60D—VEHICLE CONNECTIONS
    • B60D1/00—Traction couplings; Hitches; Draw-gear; Towing devices
    • B60D1/48—Traction couplings; Hitches; Draw-gear; Towing devices characterised by the mounting
    • B60D1/56—Traction couplings; Hitches; Draw-gear; Towing devices characterised by the mounting securing to the vehicle bumper
    • B60D1/565—Traction couplings; Hitches; Draw-gear; Towing devices characterised by the mounting securing to the vehicle bumper having an eyelet

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Body Structure For Vehicles (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は自動車の牽引フック取付構造に関する。
【０００２】
【従来の技術】
自動車の牽引フック取付構造の中には、例えば実開平４−３９９１１号公報に示されているように、車体の前部又は後部の主要骨格部材であるサイドメンバの端部に略箱形のバンパーステイを取付け、このバンパーステイの車外側の端壁に閉断面に形成したバンパーレインフォースを取付けて、これらバンパーステイ、バンパーレインフォースを貫通してフックステイを配設し、該フックステイに牽引フックを取付けてそのフック端をバンパーフエイシヤから外部に突出配置したものが知られている。
【０００３】
【発明が解決しようとする課題】
前記従来の構造にあっては、フックステイの一端をバンパーレインフォースの車外側の側壁に固定し、他端をサイドメンバに固定してあるため、車両の前、後方向の軽衝突時に牽引フックに衝突入力が作用すると、該衝突入力が直接サイドメンバに伝達されて、バンパーレインフォースやバンパーステイが潰れ変形することがなく、これらバンパーレインフォース、バンパーステイをエネルギー吸収に寄与させることができない。
【０００４】
一方、このような構造の他に、例えば特開２０００−２９６７４２号公報に示されているように、前述のフックステイの固定側端部（牽引フック取付側と反対側の端部）を、バンパーステイの車外側の端壁に固定したものが提案されており、この構造では前述の衝突入力をバンパーステイが受けるため、該バンパーステイが潰れ変形してエネルギー吸収が期待できるとしても、フックステイの固定点がバンパーステイの車外側端壁に存在しているため、該バンパーステイが上下方向又は左右方向へ潰れ変形が定まらずに変形する可能性があって、有効なエネルギー吸収を行わせ難いことは否めない。
【０００５】
そこで、本発明は前後方向の衝突入力に対してバンパーステイを確実に前後方向に潰れ変形させて効率的なエネルギー吸収を行わせることができる自動車の牽引フック取付構造を提供するものである。
【０００６】
【課題を解決するための手段】
請求項１の発明にあっては、車体の前部又は後部に車体前後方向に配設したサイドメンバの車外側の端部に略箱形に形成したバンパーステイを該サイドメンバの略同軸線上に取付け、該バンパーステイの前後方向の車外側の端壁とこれに対向する取付壁とに跨ってフックステイを前後方向に配設し、該フックステイに牽引フックを取付可能とした構造において、前記フックステイの一端をバンパーステイの車外側の端壁に固定する一方、他端をバンパーステイの取付壁を貫通して該取付壁に対して前後方向に移動可能に取付けたことを特徴としている。
【０００７】
請求項２の発明にあっては、請求項１に記載のバンパーステイの他端部に、牽引フックに作用する牽引荷重をバンパーステイの取付壁に伝達する荷重伝達部を設けたことを特徴としている。
【０００８】
請求項３の発明にあっては、請求項１，２に記載のバンパーステイの車外側の端壁に、牽引フックを前後方向に貫通させて前後方向入力に対して前後方向に圧潰変形可能なバンパーレインフォースを取付けたことを特徴としている。
【０００９】
請求項４の発明にあっては、請求項３に記載のバンパーレインフォースの内側に牽引フックと同軸的にエネルギー吸収部材を配設したことを特徴としている。
【００１０】
【発明の効果】
請求項１に記載の発明によれば、車両の前後方向の軽衝突により牽引フックもしくは索引フックを取付可能なフックステイに軸方向に衝突入力が作用すると、この衝突入力をバンパーステイの車外側の端壁が受けて該バンパーステイが潰れ変形を開始するが、この時、フックステイの他端がバンパーステイの取付壁に対して入力軸線方向に前後方向移動して、該フックステイがバンパーステイの圧潰変形ガイドとして機能する。
【００１１】
このため、バンパーステイが上下方向又は左右方向等へ倒れることなく確実に前後方向に潰れ変形させることができて、効率的なエネルギー吸収を行わせることができる。
【００１２】
請求項２に記載の発明によれば、請求項１の発明の効果に加えて、牽引フックに作用する牽引荷重を、バンパーステイの車外側の端壁で受けることは勿論、フックステイの他端の荷重伝達部を介してバンパーステイの取付壁でも荷重を受けるため、牽引荷重を分散してバンパーステイの抗力を高められ、該バンパーステイの応力集中による局部的変形を回避することができて板厚を可及的に薄肉化して軽量化に寄与することができる。
【００１３】
請求項３に記載の発明によれば、請求項１，２の発明の効果に加えて、衝突が進行した際にバンパーレインフォースも前後方向に潰れ変形させることができる。
【００１４】
請求項４に記載の発明によれば、請求項３の発明の効果に加えて、索引フックの取付時にエネルギー吸収部材にガイドされることで作業性が向上すると共に、牽引フック周りでバンパーレインフォース内側のエネルギー吸収部材が圧縮変形して、これらバンパーレインフォース及びエネルギー吸収部材によりエネルギー吸収が行われるため、エネルギー吸収量を格段に増大することができる。
【００１５】
【発明の実施の形態】
以下、本発明の実施形態を自動車の前部に配設される牽引フックを例に採って詳述する。
【００１６】
図１，２において、１は図外のフロントコンパートメントの車幅方向両側部に前後方向に配設したサイドメンバを示し、該サイドメンバ１はフロントコンパートメントの主要骨格メンバを構成すると共に、車両の前面衝突時におけるエネルギー吸収の主要部材を成すもので、閉断面に形成して前面衝突入力に対して前後方向に座屈変形してエネルギー吸収を行えるようにしてある。
【００１７】
サイドメンバ１の車外側の端部である前端には端壁２を固設して閉断面を閉塞してあり、該端壁２の略中央には後述するフックステイの後端を挿通するステイ挿通孔３を形成してある。
【００１８】
４は前記サイドメンバ１の前端に取付けられるバンパーステイを示し、該バンパーステイ４は上下、左右側壁からなる周壁４ａと、車外側の端壁である前端壁４ｂと、これに対向する取付壁である後端壁４ｃとで方形の略箱形に形成してある。
【００１９】
周壁４ａは後端に周縁フランジ４ｄを有し、バンパーステイ４は該周壁４ａの周縁フランジ４ｄと後端壁４ｃとを重合した状態でサイドメンバ１の端壁２に突合わせて、周縁フランジ４ｄの部分でボルト５，ナット６によって該端壁２に締結固定して、サイドメンバ１と略同軸線上に配置してある。
【００２０】
バンパーステイ４の略中心位置には、前端壁４ｂと後端壁４ｃとに跨ってフックステイ７を前後方向に配設してある。
【００２１】
この前端壁４ｂの略中心部には牽引フック８の後端中心部に突設したねじ軸８ａを挿通する取付孔９を形成してあり、また、後端壁４ｃの略中心部にはフックステイ７の後端部を挿通するステイ挿通孔１０を形成してある。
【００２２】
一方、フックステイ７は前記ねじ軸８ａを螺合可能なように筒状に形成してあり、その前端をバンパーステイ４の前端壁４ｂの裏面に取付孔９と同心的に溶接固定すると共に、後端を前記ステイ挿通孔１０，３に挿通してバンパーステイ４の後端壁４ｃおよびサイドメンバ１の端壁２に前後方向に移動可能に貫通配置してある。
【００２３】
本実施形態では前記バンパーステイ４の前端壁４ｂに、フロントバンパー１１のバンパーレインフォース１２を取付けてある。
【００２４】
このバンパーレインフォース１２は前側壁１３と後側壁１４とこれらを連設する上、下壁１５とで車幅方向に延在する方形の閉断面に形成して、前面衝突入力に対して前後方向に圧潰変形可能に構成してある。
【００２５】
この後側壁１４にはバンパーステイ４と対応する部位に取付孔９と同心的に取付孔１６を形成してあると共に、前側壁１３には該取付孔１６の同軸線上に比較的大きな開窓部１７を形成してある。
【００２６】
バンパーレインフォース１２は前記開窓部１７から該バンパーレインフォース１２内に例えば合成樹脂等の弾性材からなるブロック状のエネルギー吸収部材１８を挿入し、該エネルギー吸収部材１８とバンパーステイ４の前端壁４ｂとでバンパーレインフォース１２の後側壁１４を挟んだ状態で該エネルギー吸収部材１８の後端に設けたブラケット部１８ａの部分で前記前端壁４ｂにボルト２０，ナット２１によって共締め固定してある。
【００２７】
前記エネルギー吸収部材１８の中心部にはフック挿通孔１９を形成してあり、牽引フック８はエネルギー吸収部材１８のフック挿通孔１９を通して前記フックステイ７に取付けられる。
【００２８】
具体的には、牽引フック８を前記エネルギー吸収部材１８のフック挿通孔１９に挿通すると共に、後端のねじ軸８ａをフックステイ７に螺合し、該牽引フック８の後端面をバンパーレインフォース１２の後側壁１４の取付孔１６周縁に係止させ、フックステイ７の後端にボルト２４を螺合してある。
【００２９】
ボルト２４はフランジ２５を一体に備えた所謂座付きボルトが用いられ、フランジ２５はバンパーステイ４の後端壁４ｃのステイ挿通孔１０の周縁部に跨る大きさに形成して、該フランジ２５が該後端壁４ｃに当接係合するようにしてあり、従って、本実施形態ではこのボルト２４が、牽引フック８に作用する牽引荷重をバンパーステイ４の後端壁４ｃに伝達する荷重伝達部としての機能を併有している。
【００３０】
このように、ボルト２４のフランジ２５をバンパーステイ４の後端壁４ｃに当接係合させるため、サイドメンバ１の端壁２のステイ挿通孔３は、該フランジ２５よりも大径に形成してある。
【００３１】
また、前述のようにバンパーステイ４の前端壁４ｂにバンパーレインフォース１２をエネルギー吸収部材１８と共に固定し、そして、牽引フック８をこのエネルギー吸収部材１８のフック挿通孔１９に通してフックステイ７に取付けるため、該バンパーステイ４はこれらバンパーレインフォース１２，エネルギー吸収部材１８をサブアッセンブリした状態で、前記サイドメンバ１の端壁２に取付けられる。
【００３２】
２２はバンパーレインフォース１２を覆って装着されるバンパーフェイシャを示し、牽引フック８に対応する部分には比較的小さな開窓部２３を設けて、該開窓部２３から牽引フック８の先端のフック部８ｂを外側に突出配置するようにしてある。
【００３３】
また、この開窓部２３は牽引フック８を使用しない場合にあっては盲蓋２６によって閉塞するようにしてある。
【００３４】
以上の実施形態の構造によれば、車両の前面軽衝突により牽引フック８もしくは索引フック８を取付可能なフックステイ７に軸方向に衝突入力が作用すると、この衝突入力をバンパーステイ４の前端壁４ｂが受けて該バンパーステイ４が潰れ変形を開始するが、この時、フックステイ７の後端がバンパーステイ４の後端壁４ｃおよびサイドメンバ１の端壁２に対して、それらのステイ挿通孔１０，３を介して入力軸線方向に後退移動して、該フックステイ７がバンパーステイ４の圧潰変形ガイドとして機能する。
【００３５】
このため、バンパーステイ４が上下方向又は左右方向等へ倒れることなく確実に前後方向に潰れ変形させることができて、効率的なエネルギー吸収を行わせることができる。
【００３６】
そして、衝突が進行するとバンパーレインフォース１２も前後方向に潰れ変形させることができると共に、牽引フック８もしくはバンパーレインフォース１２の後側壁１４の取付孔１６周りでエネルギー吸収部材１８が圧縮変形して、これらバンパーレインフォース１２及びエネルギー吸収部材１８によりエネルギー吸収が行われるため、エネルギー吸収量を格段に増大することができる（図３参照）。なお図３は索引フック８使用時を示すが、非使用時でも同様にバンパーステイ４やバンパーレインフォース１２の潰れ変形が得られるのは勿論である。
【００３７】
この結果、前面軽衝突時には効率的なエネルギー吸収を行わせることができると共に、サイドメンバ１に変形が波及するのを回避して、フロントバンパー１１およびバンパーステイ４の破損のみにとどめることができる。
【００３８】
また、本実施形態では索引フック８使用時にあっては、牽引フック８を固定したボルト２４のフランジ２５がバンパーステイ４の後端壁４ｃに当接係合して牽引荷重を伝達する荷重伝達部を構成しているため、牽引フック８に作用する牽引荷重を、バンパーステイ４の前端壁４ｂで受けることは勿論、フックステイ７の後端でフランジ２５を介して該バンパーステイ４の後端壁４ｃでも荷重を受ける。
【００３９】
このため、牽引荷重を分散してバンパーステイ４の抗力を高められ、該バンパーステイ４の応力集中による局部的変形を回避することができて板厚を可及的に薄肉化して軽量化に寄与することもできる。また、索引フック８の取付時にエネルギー吸収部材１８にガイドされることで作業性が向上する。
【００４０】
前記第１実施形態ではボルト２４のフランジ２５が当接係合する部分、すなわち、バンパーステイ４の後端壁４ｃのステイ挿通孔１０の周縁を、該後端壁４ｃの板厚のままとしてあるが、図４に示す第２実施形態のように該周縁部に厚肉部４ｅを形成すれば、ステイ挿通孔１０の周縁部を補強できて、牽引時の変形防止を行うことができる。
【００４１】
また、前記第１実施形態ではフックステイ７を筒状に形成しているが、この他、図５に示す第３実施形態のようにフックステイ７を中実に形成してその前端面からねじ孔７ａを形成し、該ねじ孔７ａに牽引フック８のねじ軸８ａを螺入して固定するようにしてもよい。
【００４２】
この第３実施形態の場合、フックステイ７の後端中央にねじ軸７ｂを形成して、該ねじ軸７ｂに前記第１実施形態のボルト２４と同様のフランジ３５を有するナット３４を螺装すれば、そのフランジ３５がバンパーステイ４の後端壁４ｃに当接係合して、ナット３４を牽引荷重の伝達部とすることができる。
【００４３】
更に、前記第１実施形態ではバンパーレインフォース１２をエネルギー吸収部材１８と共にバンパーステイ４の前端壁４ｂに共締め固定するようにしているが、図６に示す第４実施形態のようにバンパーステイ４の前端壁４ｂにボルト２０，ナット２１により締結固定し、エネルギー吸収部材１８はその前端部外周にフランジ嵌着溝１８ｂを設けて、該フランジ嵌着孔１８ｂをバンパーレインフォース１２の前側壁１３に設けた開窓部１７の内向きフランジ１３ａに係着して取付けるようにしてもよい。
【００４４】
図７は本発明の第５実施形態を示すもので、本実施形態は前記第１実施形態におけるバンパーレインフォース１２およびエネルギー吸収部材１８を用いない仕様の車両に適用した場合で、この第５実施形態にあっても車両の前面軽衝突の際には前述と同様の理由によりバンパーステイ４を確実に前後方向に潰れ変形させることができて、効率的なエネルギー吸収を行わせることができる。
【００４５】
前記各実施形態では車体前部に配設される牽引フックを例に採って説明したが、車体後部に配設される牽引フックに適用して前述と同様の効果が得られることは勿論である。
【図面の簡単な説明】
【図１】本発明の第１実施形態を示す略示的分解斜視図。
【図２】同実施形態の断面説明図。
【図３】同実施形態の作用を説明する断面説明図。
【図４】本発明の第２実施形態における要部を示す断面説明図。
【図５】本発明の第３実施形態における要部を示す断面説明図。
【図６】本発明の第４実施形態における要部を示す断面説明図。
【図７】本発明の第５実施形態を示す断面説明図。
【符号の説明】
１ サイドメンバ
２ 端壁（車外側の端部）
４ バンパーステイ
４ｂ 前端壁（車外側の端壁）
４ｃ 後端壁（取付壁）
７ フックステイ
８ 牽引フック
１２ バンパーレインフォース
１８ エネルギー吸収部材
２４ ボルト（荷重伝達部）
２５ フランジ（荷重伝達部） [0001]
BACKGROUND OF THE INVENTION
The present invention relates to a structure for mounting a tow hook of an automobile.
[0002]
[Prior art]
In a tow hook mounting structure of an automobile, for example, as shown in Japanese Utility Model Publication No. Hei 4-39911, a substantially box-shaped bumper is provided at the end of a side member which is a main skeleton member at the front or rear of a vehicle body. A stay is attached, a bumper reinforcement formed in a closed cross section is attached to the end wall of the bumper stay outside the vehicle, a hook stay is disposed through the bumper stay and the bumper reinforcement, and a tow hook is attached to the hook stay. And a hook end projecting from the bumper face is known.
[0003]
[Problems to be solved by the invention]
In the above-described conventional structure, one end of the hook stay is fixed to the side wall of the bumper reinforcement and the other end is fixed to the side member. When a collision input acts on the slab, the collision input is directly transmitted to the side member, and the bumper reinforcement and the bumper stay are not crushed and deformed. The bumper reinforcement and the bumper stay cannot contribute to energy absorption.
[0004]
On the other hand, in addition to such a structure, for example, as disclosed in Japanese Patent Application Laid-Open No. 2000-296742, the above-described hook stay fixed side end (the end opposite to the traction hook mounting side) is used as a bumper. In this structure, the bumper stay receives the above-mentioned collision input, so even if the bumper stay is crushed and deformed and can be expected to absorb energy, the hook stay is fixed. Since the fixed point exists on the outer end wall of the bumper stay, the bumper stay may be deformed without being crushed in the vertical direction or the horizontal direction, and it is difficult to effectively absorb energy. I cannot deny.
[0005]
Accordingly, the present invention provides a tow hook mounting structure for an automobile capable of efficiently absorbing energy by reliably collapsing and deforming a bumper stay in the front-rear direction against a collision input in the front-rear direction.
[0006]
[Means for Solving the Problems]
In the first aspect of the invention, the vehicle body of the front or rear in the vehicle longitudinal direction bumper stay which is formed in a substantially box shape in the end portion of the exterior of the side member which is disposed in a substantially coaxially line of the side members In the structure in which the hook stay is disposed in the front-rear direction across the end wall on the vehicle outer side in the front-rear direction of the bumper stay and the mounting wall facing the bumper stay, and the tow hook can be attached to the hook stay. One end of the hook stay is fixed to the end wall on the vehicle outer side of the bumper stay, and the other end is attached to the mounting wall so as to be movable in the front-rear direction through the mounting wall of the bumper stay. .
[0007]
In the invention of claim 2, the other end of the bumper stay according to claim 1 is provided with a load transmission portion for transmitting the traction load acting on the traction hook to the mounting wall of the bumper stay. Yes.
[0008]
In the invention of claim 3, the end wall on the vehicle outer side of the bumper stay according to claims 1 and 2 can be crushed and deformed in the front-rear direction with respect to the front-rear direction input by penetrating the tow hook in the front-rear direction It features a bumper reinforcement.
[0009]
The invention according to claim 4 is characterized in that the energy absorbing member is disposed coaxially with the tow hook inside the bumper reinforcement according to claim 3.
[0010]
【The invention's effect】
According to the first aspect of the present invention, when the collision input acts in the axial direction on the hook stay to which the towing hook or the index hook can be attached due to a light collision in the longitudinal direction of the vehicle, the collision input is applied to the outside of the bumper stay. The bumper stay starts to be crushed and deformed when the end wall is received.At this time, the other end of the hook stay moves back and forth in the input axial direction with respect to the mounting wall of the bumper stay, and the hook stay Functions as a crushing deformation guide.
[0011]
For this reason, the bumper stay can be reliably crushed and deformed in the front-rear direction without falling down in the up-down direction or the left-right direction, and efficient energy absorption can be performed.
[0012]
According to the second aspect of the present invention, in addition to the effect of the first aspect of the invention, the traction load acting on the traction hook is received by the end wall on the vehicle outer side of the bumper stay, as well as the other end of the hook stay. Since the load is received also on the mounting wall of the bumper stay via the load transmission part of the bumper, the drag of the bumper stay can be increased by dispersing the traction load, and local deformation due to stress concentration of the bumper stay can be avoided. The thickness can be reduced as much as possible to contribute to weight reduction.
[0013]
According to the third aspect of the present invention, in addition to the effects of the first and second aspects, the bumper reinforcement can be crushed and deformed in the front-rear direction when the collision proceeds.
[0014]
According to the invention described in claim 4, in addition to the effect of the invention of claim 3, the workability is improved by being guided by the energy absorbing member when the index hook is attached, and the bumper reinforcement around the tow hook is provided. Since the inner energy absorbing member is compressed and deformed and energy is absorbed by the bumper reinforcement and the energy absorbing member, the amount of energy absorption can be significantly increased.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described in detail by taking a tow hook disposed at the front of an automobile as an example.
[0016]
1 and 2, reference numeral 1 denotes side members disposed in the front-rear direction on both sides in the vehicle width direction of the front compartment (not shown). The side member 1 constitutes a main skeleton member of the front compartment, and also the front surface of the vehicle. It constitutes a main member for energy absorption at the time of collision, and is formed in a closed cross section so that it can buckle and deform in the front-rear direction with respect to frontal collision input to absorb energy.
[0017]
An end wall 2 is fixed to the front end, which is the end of the side member 1 outside the vehicle, to close the closed cross-section, and a stay through which a rear end of a hook stay described later is inserted substantially at the center of the end wall 2. An insertion hole 3 is formed.
[0018]
Reference numeral 4 denotes a bumper stay attached to the front end of the side member 1, and the bumper stay 4 includes a peripheral wall 4a composed of upper and lower and left and right side walls, a front end wall 4b which is an end wall on the outer side of the vehicle, and an attachment wall facing this. A certain rear end wall 4c is formed in a substantially rectangular box shape.
[0019]
The peripheral wall 4a has a peripheral flange 4d at the rear end, and the bumper stay 4 abuts the end wall 2 of the side member 1 in a state where the peripheral flange 4d and the rear end wall 4c of the peripheral wall 4a are overlapped, and the peripheral flange 4d. These are fastened and fixed to the end wall 2 by bolts 5 and nuts 6 and are arranged on the substantially coaxial line with the side member 1.
[0020]
At substantially the center position of the bumper stay 4, a hook stay 7 is disposed in the front-rear direction across the front end wall 4b and the rear end wall 4c.
[0021]
A mounting hole 9 for inserting a screw shaft 8a projecting from the center of the rear end of the traction hook 8 is formed in the substantially central portion of the front end wall 4b, and a hook is formed in the substantially central portion of the rear end wall 4c. A stay insertion hole 10 through which the rear end portion of the stay 7 is inserted is formed.
[0022]
On the other hand, the hook stay 7 is formed in a cylindrical shape so that the screw shaft 8a can be screwed together, and its front end is welded and fixed concentrically with the mounting hole 9 to the back surface of the front end wall 4b of the bumper stay 4. The rear end is inserted through the stay insertion holes 10 and 3 so as to penetrate the rear end wall 4c of the bumper stay 4 and the end wall 2 of the side member 1 so as to be movable in the front-rear direction.
[0023]
In the present embodiment, the bumper reinforcement 12 of the front bumper 11 is attached to the front end wall 4 b of the bumper stay 4.
[0024]
The bumper reinforcement 12 has a front side wall 13 and a rear side wall 14 connected to each other, and is formed in a rectangular closed cross section extending in the vehicle width direction with the lower wall 15 so as to be front-rear with respect to a front collision input. The crushing deformation is possible.
[0025]
The rear side wall 14 is formed with a mounting hole 16 concentrically with the mounting hole 9 at a portion corresponding to the bumper stay 4, and the front side wall 13 has a relatively large opening portion on the coaxial line of the mounting hole 16. 17 is formed.
[0026]
The bumper reinforcement 12 inserts a block-shaped energy absorbing member 18 made of an elastic material such as synthetic resin into the bumper reinforcement 12 from the opening window 17, and the energy absorbing member 18 and the front end wall of the bumper stay 4. 4b, the rear wall 14 of the bumper reinforcement 12 is sandwiched between the bracket 18a provided at the rear end of the energy absorbing member 18 and fixed to the front wall 4b by bolts 20 and nuts 21 together. .
[0027]
A hook insertion hole 19 is formed at the center of the energy absorbing member 18, and the tow hook 8 is attached to the hook stay 7 through the hook insertion hole 19 of the energy absorbing member 18.
[0028]
Specifically, the traction hook 8 is inserted into the hook insertion hole 19 of the energy absorbing member 18, the rear end screw shaft 8 a is screwed into the hook stay 7, and the rear end surface of the traction hook 8 is set to the bumper reinforcement. 12, the bolt 24 is screwed to the rear end of the hook stay 7.
[0029]
As the bolt 24, a so-called seated bolt integrally provided with a flange 25 is used. The flange 25 is formed so as to straddle the peripheral edge portion of the stay insertion hole 10 of the rear end wall 4 c of the bumper stay 4. In this embodiment, the bolt 24 serves as a load transmitting portion that transmits the traction load acting on the traction hook 8 to the rear end wall 4c of the bumper stay 4. It has both functions.
[0030]
In this manner, the stay insertion hole 3 of the end wall 2 of the side member 1 is formed to have a larger diameter than the flange 25 in order to abut and engage the flange 25 of the bolt 24 with the rear end wall 4 c of the bumper stay 4. It is.
[0031]
Further, as described above, the bumper reinforcement 12 is fixed to the front end wall 4 b of the bumper stay 4 together with the energy absorbing member 18, and the tow hook 8 is passed through the hook insertion hole 19 of the energy absorbing member 18 to the hook stay 7. For attachment, the bumper stay 4 is attached to the end wall 2 of the side member 1 in a state where the bumper reinforcement 12 and the energy absorbing member 18 are sub-assembled.
[0032]
Reference numeral 22 denotes a bumper fascia that is mounted so as to cover the bumper reinforcement 12. A relatively small opening window 23 is provided at a portion corresponding to the towing hook 8, and a hook at the tip of the towing hook 8 is provided from the opening window 23. The portion 8b is arranged to protrude outward.
[0033]
Further, the opening portion 23 is closed by a blind cover 26 when the towing hook 8 is not used.
[0034]
According to the structure of the above embodiment, when a collision input acts in the axial direction on the hook stay 7 to which the traction hook 8 or the index hook 8 can be attached due to a light front collision of the vehicle, this collision input is used as the front end wall of the bumper stay 4. 4b is received and the bumper stay 4 starts to be crushed and deformed. At this time, the rear end of the hook stay 7 is inserted into the rear end wall 4c of the bumper stay 4 and the end wall 2 of the side member 1. The hook stay 7 functions as a crushing deformation guide of the bumper stay 4 by retreating in the input axis direction through the holes 10 and 3.
[0035]
For this reason, the bumper stay 4 can be reliably crushed and deformed in the front-rear direction without falling down in the up-down direction or the left-right direction, and efficient energy absorption can be performed.
[0036]
When the collision progresses, the bumper reinforcement 12 can be crushed and deformed in the front-rear direction, and the energy absorbing member 18 is compressed and deformed around the attachment hole 16 of the rear side wall 14 of the tow hook 8 or the bumper reinforcement 12. Since energy is absorbed by the bumper reinforcement 12 and the energy absorbing member 18, the amount of energy absorption can be significantly increased (see FIG. 3). Although FIG. 3 shows when the index hook 8 is used, it is a matter of course that the bumper stay 4 and the bumper reinforcement 12 can be similarly deformed even when the index hook 8 is not used.
[0037]
As a result, efficient energy absorption can be performed at the time of a light front collision, and deformation of the side member 1 can be avoided, and only the front bumper 11 and the bumper stay 4 can be damaged.
[0038]
In the present embodiment, when the index hook 8 is used, the load transmitting portion for transmitting the traction load by the flange 25 of the bolt 24 to which the traction hook 8 is fixed comes into contact with and engages the rear end wall 4c of the bumper stay 4. Therefore, the rear end wall of the bumper stay 4 is not only received by the front end wall 4b of the bumper stay 4 but also at the rear end of the hook stay 7 via the flange 25. 4c also receives the load.
[0039]
For this reason, the drag of the bumper stay 4 can be increased by distributing the traction load, the local deformation due to the stress concentration of the bumper stay 4 can be avoided, and the plate thickness can be reduced as much as possible to contribute to weight reduction. You can also Also, workability is improved by being guided by the energy absorbing member 18 when the index hook 8 is attached.
[0040]
In the first embodiment, the portion where the flange 25 of the bolt 24 abuts and engages, that is, the peripheral edge of the stay insertion hole 10 of the rear end wall 4c of the bumper stay 4 remains the plate thickness of the rear end wall 4c. However, if the thick portion 4e is formed in the peripheral portion as in the second embodiment shown in FIG. 4, the peripheral portion of the stay insertion hole 10 can be reinforced, and deformation during pulling can be prevented.
[0041]
Further, in the first embodiment, the hook stay 7 is formed in a cylindrical shape, but in addition to this, the hook stay 7 is formed in a solid shape as in the third embodiment shown in FIG. 7a may be formed, and the screw shaft 8a of the traction hook 8 may be screwed into the screw hole 7a and fixed.
[0042]
In the case of the third embodiment, a screw shaft 7b is formed at the center of the rear end of the hook stay 7, and a nut 34 having a flange 35 similar to the bolt 24 of the first embodiment is screwed to the screw shaft 7b. For example, the flange 35 abuts and engages with the rear end wall 4c of the bumper stay 4, and the nut 34 can be used as a transmission unit for the traction load.
[0043]
Further, in the first embodiment, the bumper reinforcement 12 is fastened together with the energy absorbing member 18 to the front end wall 4b of the bumper stay 4; however, the bumper stay 4 as in the fourth embodiment shown in FIG. The energy absorbing member 18 is provided with a flange fitting groove 18b on the outer periphery of the front end, and the flange fitting hole 18b is formed on the front side wall 13 of the bumper reinforcement 12. You may make it attach to the inward-facing flange 13a of the provided opening part 17, and attach.
[0044]
FIG. 7 shows a fifth embodiment of the present invention. This embodiment is applied to a vehicle having specifications that do not use the bumper reinforcement 12 and the energy absorbing member 18 in the first embodiment. Even in the form, the bumper stay 4 can be reliably crushed and deformed in the front-rear direction for the same reason as described above during a light front collision of the vehicle, and efficient energy absorption can be performed.
[0045]
In each of the embodiments described above, the tow hook disposed at the front part of the vehicle body has been described as an example, but it is needless to say that the same effect as described above can be obtained by applying to the tow hook disposed at the rear part of the vehicle body. .
[Brief description of the drawings]
FIG. 1 is a schematic exploded perspective view showing a first embodiment of the present invention.
FIG. 2 is an explanatory cross-sectional view of the same embodiment.
FIG. 3 is an explanatory cross-sectional view for explaining the operation of the embodiment.
FIG. 4 is an explanatory cross-sectional view showing a main part in a second embodiment of the present invention.
FIG. 5 is an explanatory cross-sectional view showing a main part in a third embodiment of the present invention.
FIG. 6 is an explanatory cross-sectional view showing a main part in a fourth embodiment of the present invention.
FIG. 7 is an explanatory cross-sectional view showing a fifth embodiment of the present invention.
[Explanation of symbols]
1 Side member 2 End wall (end of vehicle exterior)
4 Bumper stay 4b Front end wall (end wall on the outside of the car)
4c Rear end wall (mounting wall)
7 Hook stay 8 Tow hook 12 Bumper reinforcement 18 Energy absorbing member 24 Bolt (load transmission part)
25 Flange (Load transmission part)

Claims (4)

車体の前部又は後部に車体前後方向に配設したサイドメンバの車外側の端部に略箱形に形成したバンパーステイを該サイドメンバの略同軸線上に取付け、該バンパーステイの前後方向の車外側の端壁とこれに対向する取付壁とに跨ってフックステイを前後方向に配設し、該フックステイに牽引フックを取付可能とした構造において、前記フックステイの一端をバンパーステイの車外側の端壁に固定する一方、他端をバンパーステイの取付壁を貫通して該取付壁に対して前後方向に移動可能に取付けたことを特徴とする自動車の牽引フック取付構造。A bumper stay formed in a substantially box shape is attached to the end of the side member arranged on the front or rear of the vehicle body in the vehicle longitudinal direction on the substantially coaxial line of the side member . A hook stay is disposed in the front-rear direction across an end wall on the outside of the vehicle and a mounting wall opposite to the end wall, and a tow hook can be attached to the hook stay. A structure for mounting a tow hook for an automobile, wherein the structure is fixed to an outer end wall, and the other end is attached to the mounting wall so as to be movable in the front-rear direction through the mounting wall of the bumper stay. フックステイの他端部に、牽引フックに作用する牽引荷重をバンパーステイの取付壁に伝達する荷重伝達部を設けたことを特徴とする請求項１に記載の自動車の牽引フック取付構造。2. The tow hook mounting structure for an automobile according to claim 1, wherein a load transmitting portion for transmitting a tow load acting on the tow hook to the mounting wall of the bumper stay is provided at the other end of the hook stay. バンパーステイの車外側の端壁に、牽引フックを前後方向に貫通させて前後方向入力に対して前後方向に圧潰変形可能なバンパーレインフォースを取付けたことを特徴とする請求項１，２に記載の自動車の牽引フック取付構造。The bumper reinforcement which can be crushed and deformed in the front-rear direction with respect to the front-rear direction input by attaching a tow hook in the front-rear direction to the end wall on the vehicle outer side of the bumper stay is attached. Tow hook mounting structure for automobiles. バンパーレインフォースの内側に牽引フックと同軸的にエネルギー吸収部材を配設したことを特徴とする請求項３に記載の自動車の牽引フック取付構造。The structure for mounting a tow hook for an automobile according to claim 3, wherein an energy absorbing member is disposed coaxially with the tow hook inside the bumper reinforcement.
JP2001188577A 2001-06-21 2001-06-21 Car tow hook mounting structure Expired - Fee Related JP3765249B2 (en)

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