JP2009248818A - Vehicular body front structure - Google Patents

Vehicular body front structure Download PDF

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JP2009248818A
JP2009248818A JP2008100613A JP2008100613A JP2009248818A JP 2009248818 A JP2009248818 A JP 2009248818A JP 2008100613 A JP2008100613 A JP 2008100613A JP 2008100613 A JP2008100613 A JP 2008100613A JP 2009248818 A JP2009248818 A JP 2009248818A
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vehicle body
bumper
hole
extension member
body front
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JP5237673B2 (en
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Hideya Hanakawa
英也 花川
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Honda Motor Co Ltd
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Honda Motor Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To raise the efficiency of absorbing impact energy by using an extension member for joining a bumper and a vehicular frame. <P>SOLUTION: In a vehicular body front structure provided with a front bulkhead 17 between the bumper 24 and a subframe 23, a side member 21 of the front bulkhead 17 is provided with a through-hole 28 into which a lower impact-absorbing member 26 is inserted as the extension member of an auxiliary bumper-beam 24c. The impact energy can be absorbed over the whole length of the lower impact-absorbing member 26 so as to increase the absorbed amount of the impact energy and enable high efficient transmission of an impact load. In addition, the degradation of strength and rigidity due to the through-hole 28 provided in the side member 21 can be prevented because an edge of the through-hole 28 is formed with tongue pieces extending in a penetration direction. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、車体の前端部にてバンパの車体後方に配置されたフロントバルクヘッドを有する車体前部構造に関するものである。   The present invention relates to a vehicle body front structure having a front bulkhead disposed at the rear end of a bumper at the front end of the vehicle body.

従来、車体前部構造にあっては、車体前部において左右の側面に沿って延在するように左右一対のフロントサイドフレームが設けられ、両フロントサイドフレームの車体前側端部間がクロスメンバやフロントバルクヘッドなどを介して連結されている。また、車体前端には突エネルギを吸収するためのバンパレインフォースメントを受容したバンパが設けられている。（例えば特許文献１参照）。
特開２００６−７６４５５公報 Conventionally, in a vehicle body front part structure, a pair of left and right front side frames are provided so as to extend along the left and right side surfaces at the front part of the vehicle body. It is connected via a front bulkhead. Further, a bumper that receives a bumper reinforcement for absorbing impact energy is provided at the front end of the vehicle body. (For example, refer to Patent Document 1).
JP 2006-76455 A

上記特許文献１のものにあっては、バンパの下部に補助バンパレインフォースメントが配設されている。さらに、相手車両の側面に衝突した場合に相手車両の側面下部に延在する部材（ロッカ）に補助バンパレインフォースメントが乗り上げることを防止するために、車体側結合用に補助バンパレインフォースメントから車体後方に延出する第２メンバを車体前側に下がり勾配気味に設けている。   In the thing of the said patent document 1, the auxiliary bumper reinforcement is arrange | positioned under the bumper. Furthermore, in order to prevent the auxiliary bumper reinforcement from riding on a member (rocker) that extends to the lower side of the opponent vehicle when it collides with the side of the opponent vehicle, A second member extending rearward of the vehicle body is provided in a downwardly sloping manner toward the front side of the vehicle body.

また、第２メンバのサブフレームへの固定位置がラジエータを取り付けるラジエータサポートに対して車体後方に位置しており、第２メンバは、ラジエータサポートの縦柱とラジエータの下端を支持するラジエータサポートロアとにより上下から挟まれる状態に設けられ、かつそれらの部材と結合されている。そのため、第２メンバは中間部で上下の車体骨格部材に結合されているので、衝突時に潰れ難く、衝突エネルギの吸収効率を高め難いという問題があった。   The fixing position of the second member to the subframe is located at the rear of the vehicle body with respect to the radiator support to which the radiator is attached. The second member includes a radiator support lower that supports the vertical column of the radiator support and the lower end of the radiator. Are provided in a state of being sandwiched from above and below, and are coupled to those members. Therefore, since the second member is coupled to the upper and lower body frame members at the intermediate portion, there is a problem that it is difficult to be crushed at the time of a collision and it is difficult to increase the absorption efficiency of the collision energy.

このような課題を解決して、バンパと車体フレームとを結合するエクステンション部材による衝突エネルギの吸収効率を高めることを実現するために本発明に於いては、車体（１）の前端部にてバンパ（２４）の車体後方に配置されたフロントバルクヘッド（２１）を有する車体前部構造であって、前記フロントバルクヘッド（２１）が、前記車体（１）の上下方向に延在しかつ車体前後側の両壁部（２１ａ・２１ｂ）を有する矩形閉断面形状のサイド部材（２１）を有し、前記バンパ（２４）が、バンパビーム（２４ｃ）から車体後方に延出して車体フレーム（２３）に結合されるエクステンション部材（２６）を有し、前記サイド部材（２１）の前記両壁部（２１ａ・２１ｂ）に前記エクステンション部材（２６）が貫通する貫通孔（２８）が設けられ、前記貫通孔（２８）の縁が、前記両壁部（２１ａ・２１ｂ）における前記貫通孔（２８）の回りの部分を前記エクステンション部材（２６）の貫通方向に延在するように形成した舌片（２９ａ・２９ｂ）により形成されているものとした。   In order to solve such problems and to improve the absorption efficiency of the collision energy by the extension member that couples the bumper and the vehicle body frame, in the present invention, the bumper is provided at the front end of the vehicle body (1). (24) A vehicle body front portion structure having a front bulkhead (21) disposed at the rear of the vehicle body, wherein the front bulkhead (21) extends in the vertical direction of the vehicle body (1) and is A side member (21) having a rectangular closed cross section having both side wall portions (21a, 21b). The bumper (24) extends rearward from the bumper beam (24c) to the vehicle body frame (23). A through hole (2) having an extension member (26) to be coupled, and through which the extension member (26) penetrates the both wall portions (21a, 21b) of the side member (21). ), And the edge of the through hole (28) extends in the penetrating direction of the extension member (26) in the part around the through hole (28) in the wall portions (21a, 21b). The tongue pieces (29a and 29b) formed in the above are assumed to be formed.

特に、前記舌片（２９ａ・２９ｂ）がバーリングにより形成されていると良い。   In particular, the tongue pieces (29a, 29b) are preferably formed by burring.

本発明の請求項１によれば、フロントバルクヘッドのサイド部材にバンパビームのエクステンション部材を貫通させる貫通孔を設けたことにより、エクステンション部材の全長に渡って衝突エネルギを吸収することができ、衝突エネルギの吸収量が増大し、衝突荷重の高効率伝達が可能となる。また、貫通孔の縁が貫通方向に延在する舌片により形成されていることにより、サイド部材において貫通孔を設けたことによる強度・剛性の低下を防止することができる。   According to the first aspect of the present invention, by providing the through-hole through which the bumper beam extension member penetrates in the side member of the front bulkhead, the collision energy can be absorbed over the entire length of the extension member. As a result, the collision load can be transmitted with high efficiency. In addition, since the edge of the through hole is formed by a tongue piece extending in the penetrating direction, it is possible to prevent a decrease in strength and rigidity due to the provision of the through hole in the side member.

また、請求項２によれば、舌片をバーリング加工により形成することにより、貫通孔に舌片を設ける加工を容易に行うことができ、上記構造の実現に対する製造コストを低廉化し得る。   According to the second aspect, by forming the tongue piece by burring, it is possible to easily perform the process of providing the tongue piece in the through hole, and the manufacturing cost for realizing the above structure can be reduced.

以下、本発明の実施の形態を、図面を参照しながら説明する。図１は本発明が適用された自動車の車体前部構造を斜め前方から見た要部斜視図である。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a main part of a front body structure of an automobile to which the present invention is applied as viewed obliquely from the front.

図１に示される車体前部構造にあっては、車体前部の骨格強度部材として、車体１の前部にて左右方向に間隔をおいて車体前後方向に延在する左右一対のフロントサイドフレーム１１・１２と、左右のフロントピラー１３・１４から左右のフロントサイドフレーム１１・１２の車体前側端部の上方近傍に至る左右のメンバー１５・１６と、左右のフロントサイドフレーム１１・１２の車体前側端部と左右のメンバー１５・１６の車体前側端部とに結合されて支持されているフロントバルクヘッド１７とを有し、これらの内側にエンジンルーム１８が画定されている。   In the vehicle body front structure shown in FIG. 1, a pair of left and right front side frames that extend in the front-rear direction of the vehicle body at intervals in the left-right direction at the front portion of the vehicle body 1 as a skeleton strength member of the vehicle body front portion 11 and 12, left and right members 15 and 16 extending from the left and right front pillars 13 and 14 to the vicinity of the upper front end of the left and right front side frames 11 and 12, and the front side of the left and right front side frames 11 and 12 The front bulkhead 17 is coupled to and supported by the end portions and the vehicle body front end portions of the left and right members 15 and 16, and an engine room 18 is defined inside these.

なお、車体前記部構造としての上記各骨格強度部材は例えばコ字状断面部材と板状の蓋状部材とにより矩形閉断面を形成するものであって良く、この形状は車体の骨格強度部材として公知であり、その詳しい説明は省略する。また、左右のメンバー１５・１６と左右のフロントサイドフレーム１１・１２とにより確定される空間には前輪用の左右のホイールハウス１９・２０が設けられている。   Each of the skeleton strength members as the vehicle body part structure may have a rectangular closed cross section formed of, for example, a U-shaped cross-section member and a plate-like lid-shaped member, and this shape is used as the skeleton strength member of the vehicle body. Since it is publicly known, its detailed description is omitted. Further, left and right wheel houses 19 and 20 for front wheels are provided in a space defined by the left and right members 15 and 16 and the left and right front side frames 11 and 12.

上記フロントバルクヘッド１７は、車体前方に臨む矩形状の枠部分を有する形状に形成されており、枠部分を構成する車体幅方向の左右にて車体上下方向に延在する左右のサイド部材２１・２２の中間部で各フロントサイドフレーム１１・１２の前端部と結合されている。フロントバルクヘッド１７の枠部分を構成する車体上下方向にて車体幅方向に延在する上下のクロス部材１７ａ・１７ｂが設けられているが、上側のクロス部材１７ａにあっては、左右のサイド部材２１・２２の車体上側端部となる枠部分の上側左右角部から上記した左右のメンバー１５・１６に至る左右の後方延出部１７ｃ・１７ｄが延出しており、左右の後方延出部１７ｃ・１７ｄの後端が左右のメンバー１５・１６の前端と結合されている。なお、上側クロス部材１７ａと左右の後方延出部１７ｃ・１７ｄとは平面視で車体後方に拡開されたＵ字形となるように曲成されており、その左右の角部に左右のサイド部材２１・２２の上端が結合されている。   The front bulkhead 17 is formed in a shape having a rectangular frame portion facing the front of the vehicle body, and the left and right side members 21. 22 is coupled to the front end portions of the front side frames 11 and 12 at an intermediate portion. Upper and lower cross members 17a and 17b extending in the vehicle body width direction in the vehicle body vertical direction constituting the frame portion of the front bulkhead 17 are provided. The upper cross member 17a includes left and right side members. The left and right rearward extending portions 17c and 17d extending from the upper left and right corners of the frame portion that is the upper end of the vehicle body 21 and 22 to the left and right members 15 and 16 extend, and the left and right rearward extending portions 17c The rear end of 17d is connected to the front ends of the left and right members 15 and 16. The upper cross member 17a and the left and right rear extending portions 17c and 17d are bent so as to have a U-shape expanded rearward of the vehicle body in plan view, and the left and right side members are formed at the left and right corners. The upper ends of 21 and 22 are joined.

また、左右のフロントサイドフレーム１１・１２の下側であってエンジンルーム１８の下面に相当する部分に車体フレームを構成するサブフレーム２３が配設されている。このサブフレーム２３に図示されないエンジンが搭載される。   A sub frame 23 constituting a vehicle body frame is disposed below the left and right front side frames 11 and 12 and corresponding to the lower surface of the engine room 18. An engine (not shown) is mounted on the subframe 23.

図２は図１の矢印II線から見た車体前部構造の要部左側面図である。なお、車体前部構造にあっては左右対称であり、以下、特に断らない限り車体前部の左側部分について説明する。   FIG. 2 is a left side view of the main part of the vehicle body front structure as seen from the arrow II line in FIG. The vehicle body front portion structure is bilaterally symmetric. Hereinafter, the left side portion of the vehicle body front portion will be described unless otherwise specified.

フロントバルクヘッド１７の車体前方には、図２に示されるようにバンパ２４が配設されている。バンパ２４は、車体１の外面を形成すると共にフロントバルクヘッド１７側に開放された凹設形状のバンパカバー２４ａと、バンパカバー２４ａの内側の上側および下側部分にて車体幅方向に延在するように受容された主バンパビーム２４ｂおよび本発明におけるバンパビームとしての補助バンパビーム２４ｃとにより構成されている。   A bumper 24 is disposed in front of the front bulkhead 17 as shown in FIG. The bumper 24 forms an outer surface of the vehicle body 1 and extends in the vehicle body width direction at a concave bumper cover 24a opened to the front bulkhead 17 side, and on the upper and lower portions inside the bumper cover 24a. The main bumper beam 24b received as described above and the auxiliary bumper beam 24c as the bumper beam in the present invention are configured.

主バンパビーム２４ｂおよび補助バンパビーム２４ｃは、それぞれ車幅方向の左右端部近傍にて車体後方に延出された上側衝撃吸収部材２５およびエクステンション部材としての下側衝撃吸収部材２６を一体的に有している。各衝撃吸収部材２５・２６共、上記した骨格強度部材と同様に矩形閉断面形状に形成されているものであって良い。なお、上側衝撃吸収部材２５の車体後方端部はサイド部材２１に結合され、かつフロントサイドフレーム１１と同軸的に設けられている。   The main bumper beam 24b and the auxiliary bumper beam 24c integrally have an upper impact absorbing member 25 and a lower impact absorbing member 26 as an extension member that extend rearward of the vehicle body in the vicinity of the left and right ends in the vehicle width direction. Yes. Each of the shock absorbing members 25 and 26 may be formed in a rectangular closed cross-sectional shape in the same manner as the above-described skeleton strength member. The rear end of the vehicle body of the upper shock absorbing member 25 is coupled to the side member 21 and is provided coaxially with the front side frame 11.

補助バンパビーム２４ｃは、図１の二点鎖線に示されるように下側衝撃吸収部材２６が一体化された状態で、左右のサイド部材２１・２２のそれぞれ下部に設けられた各貫通孔２８に各下側衝撃吸収部材２６を貫通させて組み付けられる。下側衝撃吸収部材２６は、図３に示されるように、サイド部材２１を貫通した状態で、その車体後方端部がサブフレーム２３の車体前側端部に通しボルト２７により結合されている。   The auxiliary bumper beam 24c is inserted into each through hole 28 provided at the lower part of each of the left and right side members 21 and 22 in a state where the lower impact absorbing member 26 is integrated as shown by a two-dot chain line in FIG. The lower shock absorbing member 26 is passed through and assembled. As shown in FIG. 3, the lower impact absorbing member 26 is penetrated through the side member 21, and the rear end of the vehicle body is coupled to the front end of the sub frame 23 by a through bolt 27.

貫通孔２８は、サイド部材２１の車体前側壁部としてのコ字状断面部材の底壁部分２１ａと、車体後側壁部としての蓋状部材２１ｂとを同軸にそれぞれ車体前側からバーリング加工して形成されている。上記バーリング加工により、底壁部分２１ａと蓋状部材２１ｂとにはそれぞれ車体前後方向に延在するように曲成された舌片２９ａ・２９ｂが形成されており、各舌片２９ａ・２９ｂにより貫通孔２８の縁が形成されている。これにより、サイド部材２１に貫通孔２８を設けても、断面積を最小としかつ最大の強度が得られ、その縁部分が強化されるため、貫通孔２１を設けたことにより強度低下が抑制される。そのような舌片２９ａ・２９ｂの形成にあっては、特にバーリング加工に限られないが、バーリング加工で形成することにより加工が容易であり、舌片２９ａ・２９ｂを設ける製造コストを低廉化し得る。   The through hole 28 is formed by burring the bottom wall portion 21a of the U-shaped cross-section member as the vehicle body front side wall portion of the side member 21 and the lid-like member 21b as the vehicle body rear side wall portion from the vehicle body front side. Has been. By the burring process, tongue pieces 29a and 29b are formed in the bottom wall portion 21a and the lid-like member 21b so as to extend in the longitudinal direction of the vehicle body. The tongue pieces 29a and 29b are penetrated by the tongue pieces 29a and 29b. An edge of the hole 28 is formed. Thereby, even if the through hole 28 is provided in the side member 21, the cross-sectional area is minimized and the maximum strength is obtained, and the edge portion is strengthened. The The formation of the tongue pieces 29a and 29b is not limited to the burring process. However, the formation of the tongue pieces 29a and 29b is easy by the burring process, and the manufacturing cost for providing the tongue pieces 29a and 29b can be reduced. .

このように下側衝撃吸収部材２６が設けられていることから、バンパ３１とサブフレーム２３との間にフロントバルクヘッド１７が配設されていても、そのサイド部材２１を貫通して下側衝撃吸収部材２６が設けられていることにより、下側衝撃吸収部材２６の全長Ｌを長く取ることができる。衝突時の荷重Ｆにより下側衝撃吸収部材２６はその全長Ｌに渡って変形し得ることから、衝突エネルギの吸収量を増大することができる。   Since the lower impact absorbing member 26 is provided in this way, even if the front bulkhead 17 is disposed between the bumper 31 and the subframe 23, the lower impact is penetrated through the side member 21. By providing the absorbing member 26, the entire length L of the lower impact absorbing member 26 can be increased. Since the lower impact absorbing member 26 can be deformed over its entire length L due to the load F at the time of collision, the amount of collision energy absorbed can be increased.

本発明が適用された自動車の車体前部構造を斜め前方から見た要部斜視図である。It is the principal part perspective view which looked at the vehicle body front part structure of the motor vehicle to which this invention was applied from diagonally forward. 図１の矢印II線から見た車体前部の要部拡大側面図である。FIG. 2 is an enlarged side view of a main part of a front part of a vehicle body as seen from the arrow II line in FIG. 1. 図２の矢印III−III線に沿って見た断面図である。It is sectional drawing seen along the arrow III-III line of FIG.

符号の説明Explanation of symbols

１ 車体
２１ フロントバルクヘッド
２１ａ 底壁部分（壁部）
２１ｂ 蓋状部材（壁部）
２３ サブフレーム（車体フレーム）
２４ バンパ
２４ｃ 補助バンパビーム（バンパビーム）
２６ 下側衝撃吸収部材（エクステンション部材）
２８ 貫通孔
２９ａ・２９ｂ 舌片 1 Car body 21 Front bulkhead 21a Bottom wall part (wall part)
21b Lid member (wall)
23 Subframe (body frame)
24 Bumper 24c Auxiliary bumper beam (bumper beam)
26 Lower impact absorbing member (extension member)
28 Through-hole 29a / 29b Tongue piece

Claims (2)

車体の前端部にてバンパの車体後方に配置されたフロントバルクヘッドを有する車体前部構造であって、
前記フロントバルクヘッドが、前記車体の上下方向に延在しかつ車体前後側に両壁部を有する矩形閉断面形状のサイド部材を有し、
前記バンパが、バンパビームから車体後方に延出して車体フレームに結合されるエクステンション部材を有し、
前記サイド部材の前記両壁部に前記エクステンション部材が貫通する貫通孔が設けられ、
前記貫通孔の縁が、前記両壁部における前記貫通孔の回りの部分を前記エクステンション部材の貫通方向に延在するように形成した舌片により形成されていることを特徴とする車体前部構造。 A vehicle body front structure having a front bulkhead arranged at the rear end of the bumper at the front end of the vehicle body,
The front bulkhead includes a side member having a rectangular closed cross-sectional shape extending in the vertical direction of the vehicle body and having both wall portions on the vehicle body front-rear side,
The bumper has an extension member that extends from the bumper beam to the rear of the vehicle body and is coupled to the vehicle body frame,
A through hole through which the extension member passes is provided in the both wall portions of the side member,
The vehicle body front structure characterized in that an edge of the through hole is formed by a tongue piece formed so that a portion around the through hole in the both wall portions extends in a direction through which the extension member passes. . 前記舌片がバーリングにより形成されていることを特徴とする請求項１に記載の車体前部構造。   The vehicle body front structure according to claim 1, wherein the tongue piece is formed by burring.
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