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JP2008279876A - Bumper reinforcement structure for vehicle body of automobile - Google Patents

Bumper reinforcement structure for vehicle body of automobile Download PDF

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Publication number
JP2008279876A
JP2008279876A JP2007125235A JP2007125235A JP2008279876A JP 2008279876 A JP2008279876 A JP 2008279876A JP 2007125235 A JP2007125235 A JP 2007125235A JP 2007125235 A JP2007125235 A JP 2007125235A JP 2008279876 A JP2008279876 A JP 2008279876A
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Japan
Prior art keywords
bumper reinforcement
vehicle body
bumper
reinforcing member
hook
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Granted
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JP2007125235A
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Japanese (ja)
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JP5064881B2 (en
Inventor
Takahiko Tsuboi
孝彦 坪井
Toshinobu Yamamoto
利宜 山本
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Unipres Corp
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Unipres Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To prevent an increase in displacement of a bumper reinforcement due to traction loads applied on a towing hook in the bumper reinforcement made of metal with a structure with the towing hook. <P>SOLUTION: The bumper reinforcement 14 made of metal forms a tube in a rectangular shape in cross section with its both ends open. The towing hook 18 is inserted via an opening of a bumper fascia, and screwed into a base fixed in the lower face of the bumper reinforcement 14. A reinforcing member 26 is welded and fixed in the opening end on the towing hook side of the bumper reinforcement 14 so as to close the opening 14' of the bumper reinforcement. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

この発明は自動車において、車体サイドメンバの前端部若しくは後端部におけるバンパレインフォースに牽引フックを設けたバンパレインフォース構造に関するものである。   The present invention relates to a bumper reinforcement structure in which a traction hook is provided on a bumper reinforcement at a front end portion or a rear end portion of a vehicle body side member in an automobile.

牽引フックを車体サイドメンバの前端部若しくは後端部間に張設されるバンパレインフォースに固定し、 バンパレインフォースに車体前面の装飾部品であるバンパフェーシアを取り付けた構造のものがある。バンパレインフォースは車体の幅方向に延びており、衝突時に潰れることにより衝突エネルギを吸収し、さもなければ生じ得る衝突エネルギのサイドメンバへの伝達、延いてはサイドメンバの恒久的変形を未然防止する。このようなバンパレインフォースの機能からバンパレインフォースは所定の衝突荷重で圧潰するように金属管材にて構成されており、最近は軽量化のためのアルミニュームの押し出し材を素材とするものが多くなっている(特許文献1)。
特開2004−299636号公報
There is a structure in which a tow hook is fixed to a bumper reinforcement that is stretched between a front end portion or a rear end portion of a vehicle body side member, and a bumper facia that is a decorative part on the front surface of the vehicle body is attached to the bumper reinforcement. The bumper reinforcement extends in the width direction of the vehicle body and absorbs collision energy by being crushed at the time of collision. Otherwise, transmission of collision energy to the side member, which prevents permanent deformation of the side member, is prevented. To do. Because of this bumper reinforcement function, the bumper reinforcement is made of metal tube material so that it can be crushed by a predetermined collision load. Recently, many of the materials are made of extruded aluminum material for weight reduction. (Patent Document 1).
JP 2004-299636 A

牽引フックの基部はバンパレインフォースの下部に溶接等により固定され、牽引フックは基部に一端ねじ部が螺合され、他端のフック部がバンパフェーシアの開口部を介して車体前方若しくは後方に突出している。牽引フックはバンパレインフォースの下面に対して片持配置となっているため、牽引時にバンパレインフォースは捻りを受け、他方バンパレインフォースが金属の筒状体の場合に捻りにより変位量が大きくなり、牽引フックがバンパフェーシアと干渉してしまう虞があった。この対策として牽引フックの取付部品であるブラケットの取付面を大きくしたり、バンパレインフォースの肉厚を大きくすることが考えられる。しかしながら、牽引フックの取付ブラケットの取付面を大きくしても捻りに対するバンパレインフォースの剛性にはあまり寄与せず、対策としてそもそも有効ではなかった。また、バンパレインフォースの肉厚の増大は衝突時の反力を増大させ、衝突時に積極的に変形させ、車体を保護するというバンパレインフォース本来の機能を損なう恐れがあった。   The base of the tow hook is fixed to the lower part of the bumper reinforcement by welding or the like, and the tow hook is screwed with one end threaded to the base, and the other end hook part is forward or rearward of the vehicle body through the opening of the bumper fascia. It protrudes. Since the tow hook is cantilevered with respect to the lower surface of the bumper reinforcement, the bumper reinforcement is twisted during towing, and when the bumper reinforcement is a metal cylinder, the amount of displacement increases due to the twist. The towing hook may interfere with the bumper fascia. As countermeasures, it is conceivable to increase the mounting surface of the bracket, which is a mounting component of the tow hook, or to increase the thickness of the bumper reinforcement. However, even if the mounting surface of the mounting bracket of the tow hook is enlarged, it does not contribute much to the rigidity of the bumper reinforcement against torsion, and it is not effective as a countermeasure in the first place. In addition, the increase in the thickness of the bumper reinforcement may increase the reaction force at the time of collision, and may damage the original function of the bumper reinforcement that protects the vehicle body by positively deforming at the time of collision.

この発明はこのような従来技術の問題点に鑑みてなされたものであり、金属を素材としたバンパレインフォースにおいて、衝突に対して潰れ、車体を保護するというバンパレインフォース本来の機能を損なうことなく、牽引フックに加わる牽引荷重によるバンパレインフォースの変位の増大を防止すること目的とする。   The present invention has been made in view of such problems of the prior art, and in the bumper reinforcement made of metal, the original function of the bumper reinforcement that is crushed against a collision and protects the vehicle body is impaired. The object is to prevent an increase in the displacement of the bumper reinforcement due to the traction load applied to the traction hook.

この発明によれば、車体端部のバンパレインフォースが金属を素材とした両端の開口した断面矩形の筒形状をなし、かつバンパレインフォースに牽引フックを設けた車体構造において、前記バンパレインフォースにおける少なくとも牽引フック側開口端部にバンパレインフォースの開口部を閉鎖するように補強部材を固定した自動車の車体用バンパレインフォース構造が提供される。   According to the present invention, in the vehicle body structure in which the bumper reinforcement at the end portion of the vehicle body has a cylindrical shape with a rectangular cross section opened at both ends made of a metal material, and the tow hook is provided on the bumper reinforcement. There is provided a bumper reinforcement structure for an automobile body in which a reinforcing member is fixed so as to close an opening of the bumper reinforcement at least at an opening end on a tow hook side.

牽引フックがバンパレインフォースの長手方向の略中間部に設けられている場合等にあっては、前記補強部材はバンパレインフォースの両側の開口端部に設けることができる。   In the case where the pulling hook is provided at a substantially intermediate portion in the longitudinal direction of the bumper reinforcement, the reinforcing member can be provided at the opening ends on both sides of the bumper reinforcement.

また、前記補強部材に車体と離間側への突出部を形成せしめることができ、バンパレインフォースの衝突時の圧潰機能を補助させることができる。   Further, the reinforcing member can be formed with a projecting portion on the side away from the vehicle body, and the crushing function at the time of collision of the bumper reinforcement can be assisted.

両端の開口した断面矩形の筒形状のバンパレインフォースの少なくとも少なくとも牽引フック側開口端部にバンパレインフォースの開口部を閉鎖するように補強部材を設けることで、牽引時にバンパレインフォースが捻りを受けたときの牽引フックの変位を抑え、牽引フックがバンパフェーシアと干渉してしまう虞を回避することができる。そして、バンパレインフォースの肉厚はそのままであるため、衝突により圧潰し、サイドメンバ等の車体骨格部材を保護するというバンパレインフォースの本来の機能は全然損なわれることがない。   A bumper reinforcement is twisted during towing by providing a reinforcing member to close the opening of the bumper reinforcement at least at the opening end on the pulling hook side of the cylindrical bumper reinforcement having a rectangular cross section with both ends open. The displacement of the tow hook can be suppressed, and the possibility that the tow hook interferes with the bumper fascia can be avoided. Since the thickness of the bumper reinforcement remains the same, the original function of the bumper reinforcement, which is crushed by a collision and protects a vehicle body skeleton member such as a side member, is not impaired at all.

図1はこの発明に関連する自動車のボディ前部を概略的に図示しており、10は自動車ボディの骨格となるサイドメンバであり、車体の両側に一対設けられる。サイドメンバ10の前端にバンパステー12がボルトなどの締結具(図示せず)により固定され、左右のバンパステー12間にバンパレインフォース14が同じくボルトなどの締結具(図示せず)により固定される。バンパレインフォース14はこの実施形態においては図2に示すようにアルミニュームの押出しによって成形された場合略矩形断面をプレス等により曲折することにより構成される。矩形断面のバンパレインフォース14は車両前方側の前壁14Aと、車両後方側の後壁14Bと、上壁14Cと、底壁14Dとを備えている。また、バンパレインフォース14はその矩形断面の空洞を横切って前壁14Aと後壁14Bとの間を連結するように車体前後方向に延びる仕切壁14Eを備えている。即ち、バンパレインフォースは “日”型とも称すべき断面形状をなしている。   FIG. 1 schematically shows a front part of a body of an automobile related to the present invention. Reference numeral 10 denotes a side member which is a skeleton of the automobile body, and a pair of side members are provided on both sides of the vehicle body. A bumper stay 12 is fixed to the front end of the side member 10 by a fastener (not shown) such as a bolt, and a bumper reinforcement 14 is similarly fixed between the left and right bumper stays 12 by a fastener (not shown) such as a bolt. In this embodiment, the bumper reinforcement 14 is formed by bending a substantially rectangular cross section with a press or the like when formed by extrusion of aluminum as shown in FIG. The bumper reinforcement 14 having a rectangular cross section includes a front wall 14A on the front side of the vehicle, a rear wall 14B on the rear side of the vehicle, an upper wall 14C, and a bottom wall 14D. Further, the bumper reinforcement 14 includes a partition wall 14E extending in the longitudinal direction of the vehicle body so as to connect the front wall 14A and the rear wall 14B across the cavity of the rectangular cross section. In other words, the bumper reinforcement has a cross-sectional shape that should be referred to as a “day” shape.

図1において16はプラスチック材料にて形成されたバンパフェーシアであり、バンパフェーシア16はバンパレインフォース14を車両前方より被覆している。   In FIG. 1, 16 is a bumper fascia formed of a plastic material, and the bumper fascia 16 covers the bumper reinforcement 14 from the front of the vehicle.

18は牽引フックであり、バンパレインフォース14の底壁14Dの下面に溶接固定された牽引フック取付部20にねじ式に取付けられる。即ち、図2に示すように、牽引フック取付部20は車体下方への張出部20-1を備え、バンパフェーシア16に形成される開口16Aを介して挿入される牽引フック18のねじ部18-1を張出部20-1のねじ孔に螺合することにより、牽引フック18をバンパレインフォース14に装着することができる。   Reference numeral 18 denotes a tow hook, which is screwed to a tow hook mounting portion 20 that is fixed to the lower surface of the bottom wall 14D of the bumper reinforcement 14 by welding. That is, as shown in FIG. 2, the traction hook mounting portion 20 includes a projecting portion 20-1 extending downward from the vehicle body, and a thread portion of the traction hook 18 inserted through the opening 16 </ b> A formed in the bumper fascia 16. The towing hook 18 can be attached to the bumper reinforcement 14 by screwing 18-1 into the screw hole of the overhanging portion 20-1.

牽引フック18は通常時は外されているが、牽引時にねじ部18-1によってバンパレインフォース14の底壁14Dから下方に突出する取付部20の張出部20-1に固定される。牽引フック18に加わる牽引力(図2の矢印a方向)によりバンパレインフォース14はその長手方向軸線を中心に図2の想像線Mのように捻られる。バンパレインフォース14に生じた捻りは牽引フック18の先端をして想像線18´のように上昇変位させ、バンパフェーシア16にその開口部16Aの内縁を介して干渉する恐れがある。この発明ではこの問題点に対処するため、バンパレインフォース14における少なくとも牽引フック側開口端部にバンパレインフォース14の開口端部を閉鎖するように補強部材を設けている。図1〜3に示す第1の実施形態では補強部材26は、バンパレインフォース14の横断面と同一サイズの板材(パッチ)として構成され、バンパレインフォース14における牽引フック18の設置側開口端面14´(図3(イ))に当てられ、図3(ロ)に示すように溶接固定される。   The tow hook 18 is normally removed, but is fixed to the overhanging portion 20-1 of the mounting portion 20 that protrudes downward from the bottom wall 14D of the bumper reinforcement 14 by the screw portion 18-1 at the time of towing. The bumper reinforcement 14 is twisted about the longitudinal axis thereof as shown by an imaginary line M in FIG. 2 by a pulling force (in the direction of arrow a in FIG. 2) applied to the pulling hook 18. The twist generated in the bumper reinforcement 14 may cause the tip of the traction hook 18 to be displaced upward as indicated by an imaginary line 18 ′, and may interfere with the bumper fascia 16 through the inner edge of the opening 16 A. In the present invention, in order to cope with this problem, a reinforcing member is provided so that the opening end of the bumper reinforcement 14 is closed at least at the opening end of the bumper reinforcement 14 on the tow hook side. In the first embodiment shown in FIGS. 1 to 3, the reinforcing member 26 is configured as a plate material (patch) having the same size as the cross section of the bumper reinforcement 14, and the installation side opening end face 14 of the tow hook 18 in the bumper reinforcement 14. ′ (FIG. 3 (A)) and fixed by welding as shown in FIG. 3 (B).

バンパレインフォース14における牽引フック側開口端部に補強部材26を設けることにより、牽引フック18にかかる牽引力下でのバンパレインフォース14の捻りに対する剛性が高まり、捻り角度が小さくなるため、図2の想像線Mにて示す牽引フック18の変位が抑えられ、バンパフェーシア16との干渉を防止することができる。即ち、図4においてバンパレインフォース14に加わる外力と変位量との関係をこの発明L1と従来L2とで模式的に示す。入力値A0が設定牽引力とするとそのときの変位量は本発明はB1、従来はB2となり、本発明によりB2−B1=Dだけ変位量を抑制することができる。   By providing the reinforcing member 26 at the opening end of the bumper reinforcement 14 on the traction hook side, the rigidity against the twist of the bumper reinforcement 14 under the traction force applied to the traction hook 18 is increased and the twist angle is reduced. The displacement of the tow hook 18 indicated by the imaginary line M is suppressed, and interference with the bumper fascia 16 can be prevented. That is, in FIG. 4, the relationship between the external force applied to the bumper reinforcement 14 and the amount of displacement is schematically shown in the invention L1 and the conventional L2. When the input value A0 is the set traction force, the displacement amount at that time is B1 in the present invention and B2 in the conventional art, and the displacement amount can be suppressed by B2-B1 = D according to the present invention.

図5(イ)は別実施形態としての断面コの字状の補強部材126を示している。補強部材126は牽引フック18の装着側におけるバンパレインフォース14の開口端面14´を閉塞するように嵌挿される。(ロ)は補強部材126の装着状態を示し、補強部材126は、合わせ面に沿って溶接され、バンパレインフォース14に固定される。   FIG. 5 (a) shows a U-shaped reinforcing member 126 as another embodiment. The reinforcing member 126 is fitted and inserted so as to close the opening end surface 14 ′ of the bumper reinforcement 14 on the side where the tow hook 18 is mounted. (B) shows the mounting state of the reinforcing member 126, and the reinforcing member 126 is welded along the mating surface and fixed to the bumper reinforcement 14.

図6(イ)は更に別の実施形態の補強部材226を示しており、バンパレインフォース14に向けて開口した断面形状を呈しており、バンパレインフォース14の開口端面14´を閉塞するように装着され、バンパレインフォース14に合わせ面に沿って溶接固定されている。この実施形態においては補強部材226は車体から離間側に突出した突出部226Aを備えている。即ち、バンパレインフォース14が車体前部のものである場合は突出部226Aは車体前方に突出しており、バンパレインフォースが車体後部のものである場合は突出部226Aは車体後方に突出している。補強部材226による牽引フック18にかかる牽引力に対する補強機能は第1の実施形態の補強部材及び第2の実施形態の補強部材と同様である。また、突出部226Aは、背後に空間Sを形成しているため、車体前部若しくは後部における衝突時に空間Sの分だけ最初に圧潰することにより衝突時の侵入量を抑える機能を達成する。このような機能は通常は専用のブラケット部品により従来は行われていたものであるが、この実施形態では牽引力に対するバンパレインフォース補強部材226に衝突時の侵入量を抑える機能を一体化させ、コスト減を実現することができる。   FIG. 6A shows a reinforcing member 226 of still another embodiment, which has a cross-sectional shape that opens toward the bumper reinforcement 14 so as to close the opening end face 14 ′ of the bumper reinforcement 14. It is mounted and fixed to the bumper reinforcement 14 by welding along the mating surface. In this embodiment, the reinforcing member 226 includes a protrusion 226A that protrudes away from the vehicle body. That is, when the bumper reinforcement 14 is at the front of the vehicle body, the protrusion 226A protrudes forward of the vehicle body, and when the bumper reinforcement is at the rear of the vehicle body, the protrusion 226A protrudes rearward of the vehicle body. The reinforcing function for the pulling force applied to the pulling hook 18 by the reinforcing member 226 is the same as that of the reinforcing member of the first embodiment and the reinforcing member of the second embodiment. Further, since the protruding portion 226A forms a space S behind it, it achieves a function of suppressing the intrusion amount at the time of collision by first crushing by the amount of the space S at the time of a collision at the front or rear of the vehicle body. Such a function is normally performed by a dedicated bracket part. However, in this embodiment, the bumper reinforcement member 226 for traction force is integrated with a function for suppressing the intrusion amount at the time of collision, and the cost is reduced. Reduction can be realized.

以上の説明の実施形態においては図1に示すように牽引フック18は車体の片側に寄っており、牽引時の捻りによる変位が生じやすい牽引フック側の端部のみにおいてバンパレインフォースに補強部材26, 126, 226を設置するようにしているが、補強部材26, 126, 226をバンパレインフォースの両側端部に設置することができ、牽引フックがバンパレインフォース14の中央部付近に設置される場合はより好適な構造となる。   In the embodiment described above, as shown in FIG. 1, the traction hook 18 is close to one side of the vehicle body, and the reinforcing member 26 is attached to the bumper reinforcement only at the end portion on the traction hook side where displacement due to twisting is likely to occur. 126, 226 are installed, but the reinforcing members 26, 126, 226 can be installed at both ends of the bumper reinforcement, and the tow hook is installed near the center of the bumper reinforcement 14. In some cases, the structure is more suitable.

図1はこの発明の車体前端に対するバンパレインフォースの取付け部を示す概略的平面図である。FIG. 1 is a schematic plan view showing a mounting portion of a bumper reinforcement with respect to a vehicle body front end according to the present invention. 図2は牽引フック取付部材の部位におけるバンパレインフォースの横断面図(図1のII−II線に沿う矢視断面図)である。FIG. 2 is a cross-sectional view of the bumper reinforcement at the portion of the pulling hook attachment member (a cross-sectional view taken along the line II-II in FIG. 1). 図3はバンパレインフォースに対する補強部材の設置状態を模式的に示す斜視図であり、(イ)は補強部材の設置前、(ロ)は設置後を示す。FIGS. 3A and 3B are perspective views schematically showing the installation state of the reinforcing member with respect to the bumper reinforcement, where FIG. 3A shows before installation of the reinforcing member and FIG. 3B shows after installation. 図4は牽引時にバンパレインフォースに加わる力とバンパレインフォースの田変位量の関係を模式的に示すグラフである。FIG. 4 is a graph schematically showing the relationship between the force applied to the bumper reinforcement during towing and the field displacement amount of the bumper reinforcement. 図5は図3と同様であるが別実施形態におけるバンパレインフォースに対する補強部材の設置状態を模式的に示す斜視図であり、(イ)は補強部材の設置前、(ロ)は設置後を示す。FIG. 5 is a perspective view schematically showing the installation state of the reinforcing member with respect to the bumper reinforcement in another embodiment, similar to FIG. 3, wherein (a) is before installation of the reinforcing member, and (b) is after installation. Show. 図6は更に別の実施形態におけるバンパレインフォースに対する補強部材の設置状態を模式的に示す斜視図であり、(イ)は補強部材の設置前、(ロ)は設置後を示す。6A and 6B are perspective views schematically showing the installation state of the reinforcing member with respect to the bumper reinforcement in still another embodiment. FIG. 6A shows a state before installation of the reinforcing member, and FIG.

符号の説明Explanation of symbols

10…サイドメンバ
12…バンパステー
14…バンパレインフォース
16…バンパフェーシア
18…牽引フック
20…牽引フック取付部
26, 126, 226…補強部材
10 ... side member 12 ... bumper stay 14 ... bumper reinforcement 16 ... bumper fascia 18 ... tow hook 20 ... tow hook mounting part
26, 126, 226… Reinforcing members

Claims (3)

車体端部のバンパレインフォースが金属を素材とした両端の開口した断面矩形の筒形状をなし、かつバンパレインフォースに牽引フックを設けた車体構造において、前記バンパレインフォースにおける少なくとも牽引フック側開口端部にバンパレインフォースの開口部を閉鎖するように補強部材を固定した自動車の車体用バンパレインフォース構造。   In the vehicle body structure in which the bumper reinforcement at the end of the vehicle body has a rectangular cross-sectional shape with both ends opened using metal as a material, and the traction hook is provided on the bumper reinforcement, at least the traction hook side opening end in the bumper reinforcement A bumper reinforcement structure for an automobile body, in which a reinforcing member is fixed so as to close the opening of the bumper reinforcement in the section. 請求項1に記載の発明において、前記補強部材はバンパレインフォースの両側の開口端部に設けられる自動車の車体用バンパレインフォース構造。   The bumper reinforcement structure for a vehicle body of an automobile according to claim 1, wherein the reinforcing member is provided at the opening ends of both sides of the bumper reinforcement. 請求項1若しくは2に記載の発明において、前記補強部材は車体と離間側への突出部を形成した自動車の車体用バンパレインフォース構造。   3. The bumper reinforcement structure for a vehicle body of an automobile according to claim 1, wherein the reinforcing member is formed with a protruding portion on the side away from the vehicle body.
JP2007125235A 2007-05-10 2007-05-10 Bumper reinforcement structure for automobile body Expired - Fee Related JP5064881B2 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009241688A (en) * 2008-03-31 2009-10-22 Kobe Steel Ltd Bumper reinforcement
JP2012171506A (en) * 2011-02-22 2012-09-10 Mitsubishi Motors Corp Vehicular bumper
KR101345168B1 (en) * 2011-12-19 2013-12-26 주식회사 성우하이텍 Bumper beam unit for vehicle

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JP2001088633A (en) * 1999-06-21 2001-04-03 Shape Corp Bumper structure for vehicle
JP2002331889A (en) * 2001-05-11 2002-11-19 Mazda Motor Corp Car body front structure of automobile
JP2005104235A (en) * 2003-09-29 2005-04-21 Aisin Seiki Co Ltd Bumper device for automobile
JP2005313715A (en) * 2004-04-27 2005-11-10 Aisin Seiki Co Ltd Installing structure for traction hook for vehicle
JP2005313790A (en) * 2004-04-30 2005-11-10 Nissan Motor Co Ltd Bumper reinforcement for automobile

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JP2001088633A (en) * 1999-06-21 2001-04-03 Shape Corp Bumper structure for vehicle
JP2002331889A (en) * 2001-05-11 2002-11-19 Mazda Motor Corp Car body front structure of automobile
JP2005104235A (en) * 2003-09-29 2005-04-21 Aisin Seiki Co Ltd Bumper device for automobile
JP2005313715A (en) * 2004-04-27 2005-11-10 Aisin Seiki Co Ltd Installing structure for traction hook for vehicle
JP2005313790A (en) * 2004-04-30 2005-11-10 Nissan Motor Co Ltd Bumper reinforcement for automobile

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009241688A (en) * 2008-03-31 2009-10-22 Kobe Steel Ltd Bumper reinforcement
JP2012171506A (en) * 2011-02-22 2012-09-10 Mitsubishi Motors Corp Vehicular bumper
KR101345168B1 (en) * 2011-12-19 2013-12-26 주식회사 성우하이텍 Bumper beam unit for vehicle

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