JP2007106368A - Noise insulating structure of automobile - Google Patents

Noise insulating structure of automobile Download PDF

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JP2007106368A
JP2007106368A JP2005301951A JP2005301951A JP2007106368A JP 2007106368 A JP2007106368 A JP 2007106368A JP 2005301951 A JP2005301951 A JP 2005301951A JP 2005301951 A JP2005301951 A JP 2005301951A JP 2007106368 A JP2007106368 A JP 2007106368A
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cowl
grill
cowl grill
extending
grille
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JP4720422B2 (en
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Mikito Kato
幹人 加藤
Kenji Azuma
健治 東
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Mazda Motor Corp
マツダ株式会社
Starlite Co Ltd
スターライト工業株式会社
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Priority claimed from CN2006101486756A external-priority patent/CN1951751B/en
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a noise insulating structure of an automobile capable of reducing the noise to be transmitted from an engine room into a cabin. <P>SOLUTION: In an automobile provided with a cowl grille 15 having a cowl grille upper portion 20 extending from a top side of a front edge of a windshield 19 to a lower portion of a rear edge of a hood, and a cowl grille front portion 21 extending from a front edge of the cowl grille upper portion 20 to a lower portion thereof, there are provided a cowl grille extension part 32 extending above a tire house 6 on the cowl grille 15, a sound absorbing material 31 for the cowl grille extending in the vehicle width direction along the cowl grille front portion 21, and a sound absorbing material 33 for the tire house along the cowl grille extension part 32. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、自動車の遮音構造に関する。   The present invention relates to a sound insulation structure for an automobile.

車室内における静粛性を向上するための自動車の遮音構造として、特許文献1には、フロントウィンドの前縁部に沿って車幅方向に設けたカウルボックスと、カウルボックスから下側へ延びるダッシュパネルとを備えた自動車において、ダッシュパネルとカウルボックスにおけるエンジンルーム側の略全面に吸音材を取り付けたものが提案されている。   As a sound insulation structure of an automobile for improving quietness in a vehicle interior, Patent Document 1 discloses a cowl box provided in a vehicle width direction along a front edge portion of a front window, and a dash panel extending downward from the cowl box. In a vehicle equipped with a dash panel and a cowl box, a sound absorbing material attached to substantially the entire surface on the engine room side has been proposed.

実開平5−32157号公報Japanese Utility Model Publication No. 5-32157

前記特許文献1記載の遮音構造では、ダッシュパネルとカウルボックスを経て車室内へ侵入しようとするエンジンルーム内の騒音を吸音材により吸収して、車室内における静粛性を向上できる。しかし、エンジンルーム内における騒音の発生源は、エンジンだけではなく、フロントサスペンションを経てタイヤハウスに伝わる路面からの騒音もあり、特許文献1記載の遮音構造では、このタイヤハウスからの騒音を十分に吸収することができなかった。   In the sound insulation structure described in Patent Document 1, noise in the engine room, which is about to enter the vehicle interior via the dash panel and the cowl box, is absorbed by the sound absorbing material, and the quietness in the vehicle interior can be improved. However, the noise source in the engine room is not only the engine but also the noise from the road surface transmitted to the tire house through the front suspension. In the sound insulation structure described in Patent Document 1, the noise from the tire house is sufficiently reduced. Could not be absorbed.

本発明の目的は、エンジンルームから車室内へ伝達される騒音を一層低減可能な自動車の遮音構造を提供することである。   An object of the present invention is to provide a sound insulation structure for an automobile that can further reduce noise transmitted from an engine room to a vehicle interior.

本発明に係る自動車の遮音構造は、フロントウィンドの前縁部の上側からボンネットの後縁部の下方にわたって延びるカウルグリル上部と、カウルグリル上部の前縁部から下側へ延びるカウルグリル前部と有するカウルグリルを備えた自動車において、前記カウルグリルにタイヤハウス上へ延びるカウルグリル延設部を設け、前記カウルグリル前部に沿って車幅方向に延びるカウルグリル用吸音材を設け、前記カウルグリル延設部に沿ってタイヤハウス用吸音材を設けたものである。   A sound insulation structure for an automobile according to the present invention includes a cowl grill upper portion extending from an upper side of a front edge portion of a front window to a lower side of a rear edge portion of a bonnet, and a cowl grill front portion extending downward from a front edge portion of the cowl grill upper portion. In the automobile provided with the cowl grille having the cowl grille, the cowl grille is provided with a cowl grille extending part extending above the tire house, and a cowl grille sound absorbing material extending in the vehicle width direction along the front part of the cowl grille is provided. A sound absorbing material for a tire house is provided along the extending portion.

ここで、前記カウルグリルをカウルグリル上部とカウルグリル前部とに分割構成するとともに、カウルグリル上部又はカウルグリル前部にカウルグリル延設部を一体的に設けること、前記タイヤハウス用吸音材をカウルグリル延設部とタイヤハウス間に設けること、前記カウルグリル用吸音材の両端部にタイヤハウス用吸音材を一体的に設けること、などが好ましい実施の形態である。   Here, the cowl grill is divided into a cowl grill upper part and a cowl grill front part, and a cowl grill extending part is integrally provided on the cowl grill upper part or the cowl grill front part. It is a preferred embodiment that it is provided between the cowl grille extending portion and the tire house, and that the tire house sound absorbing material is integrally provided at both ends of the cowl grille sound absorbing material.

本発明に係る自動車の遮音構造によれば、カウルグリル用吸音材により、エンジンからの騒音を吸収できるので、カウルグリルを経て車室内への騒音の伝達を抑制できる。しかも、タイヤハウス上へ延びるカウルグリル延設部によりタイヤハウスからの騒音が遮断されるとともに、タイヤハウス用吸音材によりタイヤハウスからの騒音が吸収されるので、タイヤハウスから車室側への騒音の伝達が効果的に抑制されて、車室内の静粛性を一層向上できる。   According to the sound insulation structure for an automobile according to the present invention, noise from the engine can be absorbed by the sound absorbing material for the cowl grill, so that transmission of noise to the vehicle interior via the cowl grill can be suppressed. In addition, noise from the tire house is absorbed by the noise absorption material for the tire house, while noise from the tire house is absorbed by the noise absorbing material for the tire house, because the cowl grille extending part extending over the tire house is blocked. Is effectively suppressed, and the quietness of the passenger compartment can be further improved.

ここで、前記カウルグリルをカウルグリル上部とカウルグリル前部とに分割構成するとともに、カウルグリル上部又はカウルグリル前部にカウルグリル延設部を一体的に設けると、サスペンションの着脱時にカウルグリル全体を取り外す必要がないので、サスペンションの修理や交換時等における作業性を向上できる。   Here, when the cowl grill is divided into a cowl grill upper part and a cowl grill front part, and a cowl grill extending part is integrally provided at the cowl grill upper part or the cowl grill front part, the cowl grill as a whole is removed when the suspension is attached or detached. Therefore, it is possible to improve workability when the suspension is repaired or replaced.

前記タイヤハウス用吸音材をカウルグリル延設部とタイヤハウス間に設けると、カウルグリルからカウル内に透過される騒音を効果的に吸収することができる。   When the sound absorbing material for a tire house is provided between the cowl grille extending portion and the tire house, noise transmitted from the cowl grill into the cowl can be effectively absorbed.

前記カウルグリル用吸音材の両端部にタイヤハウス用吸音材を一体的に設けると、吸音材の組付性を向上できる。   When the sound absorbing material for the tire house is integrally provided at both ends of the sound absorbing material for the cowl grill, the assembling property of the sound absorbing material can be improved.

以下、本発明の実施形態を図面に基づいて説明する。
図1〜図5に示すように、自動車の前部車体構造について説明すると、車体下部には前後方向に延びる左右1対のフロントサイドフレーム1が設けられ、左右のフロントサイドフレーム1の上方には前後方向に延びるエプロンレインフォースメント2が設けられ、エプロンレインフォースメント2とフロントサイドフレーム1とにわたってエンジンルーム3の側壁を構成する左右1対のエプロンパネル4が設けられている。エンジンルーム3の上部開口を閉蓋するボンネット5が設けられ、ボンネット5はエプロンレインフォースメント2の後端近傍において図示外の左右1対のヒンジ部材(図示略)で開閉自在に支持されている。
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 to 5, the front vehicle body structure of an automobile will be described. A pair of left and right front side frames 1 extending in the front-rear direction are provided at the lower part of the vehicle body, and above the left and right front side frames 1. An apron reinforcement 2 extending in the front-rear direction is provided, and a pair of left and right apron panels 4 constituting the side wall of the engine room 3 are provided across the apron reinforcement 2 and the front side frame 1. A bonnet 5 for closing the upper opening of the engine room 3 is provided, and the bonnet 5 is supported in the vicinity of the rear end of the apron reinforcement 2 by a pair of left and right hinge members (not shown) that can be opened and closed. .

エプロンパネル4の後部にはエンジンルーム3側へ膨出するタイヤハウス6が形成され、タイヤハウス6の上部にはサスタワー7が設けられ、タイヤハウス6とサスタワー7に亙ってフロントサスペンション8が内装されている。フロントサスペンション8は、その上端部に設けたボルト部材8aをサスタワー7の上壁部7aに挿通させてナット部材9を上側から締結することで上壁部7aに固定され、フロントサスペンション8を修理したり交換したりする際には、自動車をジャッキアップした状態で、このナット部材9を緩めて交換することになる。   A tire house 6 that bulges toward the engine room 3 is formed at the rear part of the apron panel 4, and a suspension tower 7 is provided at the upper part of the tire house 6, and a front suspension 8 is provided inside the tire house 6 and the suspension tower 7. Has been. The front suspension 8 is fixed to the upper wall portion 7a by inserting the bolt member 8a provided at the upper end portion thereof into the upper wall portion 7a of the suspension tower 7 and fastening the nut member 9 from the upper side. When the vehicle is replaced, the nut member 9 is loosened and replaced while the automobile is jacked up.

エンジンルーム3の後部にはエンジンルーム3と車室16と区画するダッシュパネル17が車幅方向に設けられ、エプロンレインフォースメント2の後端部には後方斜め上側へ向けて延びるフロントピラ10が設けら、左右のフロントピラ10の下端部間にはダッシュパネル17の上部とカウルアッパパネル11とカウルロアパネル12とからなる閉断面状のカウル13が車幅方向に設けられ、フロントウィンド19の前端縁はカウル13の前端部上に固定載置され、フロントウィンド19の左右の側縁はフロントピラ10上に固定載置されている。   A dash panel 17 dividing the engine room 3 and the vehicle compartment 16 is provided at the rear part of the engine room 3 in the vehicle width direction, and a front pillar 10 extending obliquely upward rearward is provided at the rear end part of the apron reinforcement 2. Provided between the lower ends of the left and right front pillars 10 is a cowl 13 having a closed cross section made up of an upper portion of a dash panel 17, a cowl upper panel 11, and a cowl lower panel 12 in the vehicle width direction. The edges are fixedly placed on the front end portion of the cowl 13, and the left and right side edges of the front window 19 are fixedly placed on the front pillar 10.

カウルロアパネル12の前端部には前方へ延びるカウルフロントパネル14が設けられ、カウルフロントパネル14の上側にはカウルグリル15が設けられている。   A cowl front panel 14 extending forward is provided at the front end of the cowl lower panel 12, and a cowl grill 15 is provided above the cowl front panel 14.

カウルグリル15は、フロントウィンド19の前縁部の上側からボンネット5の後縁部の下方にわたって延びるカウルグリル上部20と、カウルグリル上部20の前縁部から下側へ延びるカウルグリル前部21と有し、車幅方向の略全幅にわたって設けられている。カウルグリル上部20の前端近傍部には倒立V字状の突出部22が形成され、突出部22よりも前側においてカウルグリル上部20には、多数の貫通孔を形成してなるグリル部23が形成されている。カウルグリル上部20の前端部には一段段上げした堤部24が形成され、堤部24の前端部には下方へ延びる補強部25が形成されている。   The cowl grill 15 includes a cowl grill upper part 20 that extends from the upper side of the front edge of the front window 19 to the lower side of the rear edge of the bonnet 5, and a cowl grill front part 21 that extends downward from the front edge of the cowl grill upper part 20. And provided over substantially the entire width in the vehicle width direction. An inverted V-shaped protruding portion 22 is formed in the vicinity of the front end of the cowl grill upper portion 20, and a grill portion 23 formed with a plurality of through holes is formed in the cowl grill upper portion 20 in front of the protruding portion 22. Has been. A bank portion 24 raised one step is formed at the front end portion of the cowl grill upper portion 20, and a reinforcing portion 25 extending downward is formed at the front end portion of the bank portion 24.

カウルグリル前部21には上端を下端よりもやや前方位置に配置させて上端側をやや前傾させた縦向きの前壁部26が形成され、前壁部26の上半部はカウルグリル上部20の補強部25の前側に重ね合わせて設けられている。前壁部26の上端部には後方へ延びて堤部24上に重ね合わされる重合部27が形成され、前壁部26の下端部には前方へ延びてカウルフロントパネル14の上端部に重ね合わせて接続される接続部28が形成されている。カウルグリル上部20とカウルグリル前部21とは重ね合わせ部分において図示外のビスなどの固定具にて連結されている。但し、カウルグリル前部21とカウルグリル上部20とは一体成形により製作したものを用いることもできる。   The cowl grill front portion 21 is formed with a vertical front wall portion 26 having an upper end disposed slightly forward of the lower end and the upper end side inclined slightly forward. The upper half of the front wall portion 26 is the upper portion of the cowl grille. It is provided so as to overlap the front side of the 20 reinforcing portions 25. An overlap portion 27 is formed at the upper end portion of the front wall portion 26 so as to extend rearward and overlap the dam portion 24. The lower end portion of the front wall portion 26 extends forward and overlaps with the upper end portion of the cowl front panel 14. A connecting portion 28 connected together is formed. The cowl grill upper portion 20 and the cowl grill front portion 21 are connected to each other by a fixing tool such as a screw (not shown) at the overlapping portion. However, the cowl grill front part 21 and the cowl grill upper part 20 can be manufactured by integral molding.

このようにカウルグリル上部20とカウルグリル前部21とを分割構成すると、両者を異なる材料で構成することが可能となり、例えばカウルグリル上部20を構成する素材として、ウィンドシールド下端との合い沿い性能を確保するために、カウルグリル前部21よりも軟らかい素材、例えばポリプロピレンなどを採用することができ、また、カウルグリル前部21を構成する素材として、後述のように歩行者保護性能を確保するために、カウルグリル上部20よりも脆い素材、例えばガラス繊維入りポリエチレンテレフタレートなどで構成することができる。また、カウルグリル前部21を構成する素材として、カウルグリル15の前方に位置するエンジンの排気マニホールドやターボチャージャーからの発熱に対する耐熱性に優れた材料を採用することもできる。   If the cowl grill upper part 20 and the cowl grill front part 21 are divided and configured in this way, they can be made of different materials. For example, as a material constituting the cowl grill upper part 20, performance along with the lower end of the windshield Therefore, a material softer than the cowl grill front portion 21, such as polypropylene, can be used, and a pedestrian protection performance is ensured as a material constituting the cowl grill front portion 21 as will be described later. Therefore, it can be made of a material that is more brittle than the cowl grill upper portion 20, for example, polyethylene terephthalate containing glass fiber. Further, as a material constituting the cowl grill front portion 21, a material excellent in heat resistance against heat generated from the exhaust manifold or turbocharger of the engine located in front of the cowl grill 15 can be adopted.

ボンネット5の後縁部はカウルグリル上部20の突出部22の頂部よりもやや車体後方に配置され、グリル部23への雨水等の浸入が抑制されるように構成されている。カウルグリル前部21の重合部27上にはシール部材29が重合部27に沿って設けられ、ボンネット5の裏面側に取付けたボンネットレインフォースメント30が、ボンネット5を閉じた状態で、このシール部材29に圧接されて、エンジンルーム3内への雨水等の浸入が防止されるように構成されている。   The rear edge portion of the bonnet 5 is disposed slightly behind the vehicle body from the top of the protruding portion 22 of the cowl grill upper portion 20, and is configured to suppress intrusion of rainwater or the like into the grill portion 23. A sealing member 29 is provided along the overlapping portion 27 on the overlapping portion 27 of the front portion 21 of the cowl grille, and the bonnet reinforcement 30 attached to the back side of the bonnet 5 closes the bonnet 5 in the state where It is configured to be brought into pressure contact with the member 29 to prevent rainwater or the like from entering the engine room 3.

次に、自動車の遮音構造について説明すると、図1〜図5に示すように、カウルグリル前部21の全高さにわたってその前側には車幅方向に延びるカウルグリル用吸音材31が設けられ、カウルグリル用吸音材31とカウルグリル前部21の前壁部26間には略一定の間隔が形成され、カウルグリル用吸音材31は、適当間隔置きにカウルグリル前部21にビスで固定されている。このカウルグリル用吸音材31は、フェルトで構成できるが、フェルト以外に、グラスウール、発泡ウレタン、不織布、発泡ポリプロピレンなど、吸音性を有するものであれば任意の素材からなるもので構成できる。このカウルグリル用吸音材31により、エンジンからの騒音が吸収され、カウルグリル15側への騒音の伝達が抑制されることになる。但し、このカウルグリル用吸音材31を下側へ延ばしてダッシュパネル17の前側に延設することも可能で、このように構成すると車室16内への騒音の伝達をより一層効果的に抑制できる。また、カウルグリル前部21の後側にもカウルグリル前部21に沿って車幅方向に延びるカウルグリル用吸音材を設けることができる。   Next, the sound insulation structure of an automobile will be described. As shown in FIGS. 1 to 5, a cowl grille sound absorbing material 31 extending in the vehicle width direction is provided on the front side of the cowl grille front part 21 over the entire height thereof. A substantially constant interval is formed between the sound absorbing material 31 for the grill and the front wall portion 26 of the cowl grill front portion 21, and the sound absorbing material 31 for the cowl grill is fixed to the cowl grill front portion 21 with screws at appropriate intervals. Yes. The cowl grill sound-absorbing material 31 can be made of felt, but can be made of any material other than felt, such as glass wool, foamed urethane, nonwoven fabric, and foamed polypropylene, as long as it has sound-absorbing properties. The noise absorption material 31 for the cowl grill absorbs noise from the engine and suppresses transmission of noise to the cowl grill 15 side. However, it is also possible to extend the cowl grill sound absorbing material 31 downward and to extend to the front side of the dash panel 17. With this configuration, the transmission of noise into the passenger compartment 16 can be more effectively suppressed. it can. Further, a cowl grille sound absorbing material extending in the vehicle width direction along the cowl grill front part 21 can also be provided on the rear side of the cowl grill front part 21.

カウルグリル前部21の車幅方向の両端部にはサスタワー7の上壁部7aの上側へ延びるカウルグリル延設部32がカウルグリル前部21と一体的に設けられている。カウルグリル延設部32は、サスタワー7上壁部7aに対して上下方向に間隔をあけて設けられ、カウルグリル延設部32はその外周部においてサスタワー7の上壁部7aにビス等で固定されている。このようなカウルグリル延設部32を設けると、フロントサスペンション8からサスタワー7の上壁部7aを通ってエンジンルーム3内へ侵入する騒音を遮断できる。また、カウルグリル前部21にカウルグリル延設部32を一体的に設けているので、部材点数を増やすことなく、車室16内への騒音の伝達を抑制でき、しかも修理や交換などのためフロントサスペンション8を取り外すときに、カウルグリル15全体を取り外す必要がなく、カウルグリル前部21のみをカウルグリル延設部32とともに取り外せばよいので、フロントサスペンション8の修理や交換時等における作業性を向上できる。但し、カウルグリル延設部32は、カウルグリル上部20に一体的に設けることも可能である。また、カウルグリル15がカウルグリル前部21とカウルグリル上部20とに分割構成されていない自動車においては、カウルグリル延設部32をカウルグリルの両端部に設けることになる。   A cowl grill extending portion 32 extending upward from the upper wall portion 7a of the suspension tower 7 is provided integrally with the cowl grill front portion 21 at both ends of the cowl grill front portion 21 in the vehicle width direction. The cowl grill extending portion 32 is provided with a space in the vertical direction with respect to the upper wall portion 7a of the suspension tower 7, and the cowl grill extending portion 32 is fixed to the upper wall portion 7a of the suspension tower 7 with screws or the like at the outer periphery thereof. Has been. Providing such a cowl grille extending portion 32 can block noise entering the engine room 3 from the front suspension 8 through the upper wall portion 7a of the suspension tower 7. Further, since the cowl grille extension part 32 is integrally provided on the cowl grille front part 21, it is possible to suppress the transmission of noise into the passenger compartment 16 without increasing the number of members, and for repair or replacement. When removing the front suspension 8, it is not necessary to remove the entire cowl grille 15 and only the cowl grille front part 21 needs to be removed together with the cowl grille extension part 32, so that the workability when repairing or replacing the front suspension 8 is improved. It can be improved. However, the cowl grill extension 32 may be provided integrally with the cowl grill upper portion 20. Further, in an automobile in which the cowl grill 15 is not divided into the cowl grill front part 21 and the cowl grill upper part 20, the cowl grill extending parts 32 are provided at both ends of the cowl grill.

カウルグリル延設部32の上側にはタイヤハウス用吸音材33がカウルグリル延設部32に沿って設けられ、このタイヤハウス用吸音材33によりサスタワー7からの騒音が吸収されて、エンジンルーム3内への騒音の侵入が抑制され、車室16内の静粛性を一層向上できる。このタイヤハウス用吸音材33は、カウルグリル用吸音材31とは別部材で構成することも可能であるし、カウルグリル用吸音材31の両端部に一体的に設けることも可能である。また、図5に仮想線で示すように、サスタワー7の上壁部7aとカウルグリル延設部32間にタイヤハウス用吸音材34を設けることも可能であるし、カウルグリル延設部32の上下両側にカウルグリル用吸音材33、34を設けることも可能である。但し、カウルグリル延設部32だけでも遮音効果はある程度得られるので、タイヤハウス用吸音材33は必ずしも必須の構成ではなく、省略することも可能である。   A sound absorbing material 33 for a tire house is provided along the cowl grill extending portion 32 on the upper side of the cowl grill extending portion 32, and the noise from the suspension tower 7 is absorbed by the sound absorbing material 33 for the tire house. Intrusion of noise into the interior is suppressed, and the quietness in the passenger compartment 16 can be further improved. The sound absorbing material 33 for the tire house can be configured as a member different from the sound absorbing material 31 for the cowl grill, or can be provided integrally at both ends of the sound absorbing material 31 for the cowl grill. Further, as indicated by phantom lines in FIG. 5, it is possible to provide a tire house sound absorbing material 34 between the upper wall portion 7 a of the suspension tower 7 and the cowl grill extension portion 32, and the cowl grill extension portion 32 of the cowl grill extension portion 32. It is also possible to provide cowl grille sound absorbing materials 33 and 34 on both the upper and lower sides. However, since the sound insulation effect can be obtained to some extent only by the cowl grille extending portion 32, the sound absorbing material 33 for the tire house is not necessarily an essential configuration and can be omitted.

次に、自動車の衝撃吸収構造について説明する。
この衝撃吸収構造は、歩行者がボンネット5に乗り上がったときの衝撃力、特に歩行者の頭部に対する衝撃力を緩和することを目的としたもので、ボンネット5が変形してカウルグリル前部21に対して上方からの荷重が作用したときに、カウルグリル前部21の変形や破壊を促進して、歩行者に対する衝撃力を緩和するものである。
Next, the shock absorbing structure of an automobile will be described.
This shock absorbing structure is intended to alleviate the impact force when a pedestrian gets on the bonnet 5, particularly the impact force on the pedestrian's head. When a load from above is applied to 21, the deformation and destruction of the cowl grill front portion 21 are promoted, and the impact force on the pedestrian is alleviated.

図4に示すように、カウルグリル前部21の変形や破壊を促進するため、カウルグリル上部20及びカウルグリル前部21は合成樹脂材料で構成され、カウルグリル前部21における前壁部26の高さ方向の途中部には弱部としてのV字状の切欠部35が車幅方向に設定間隔おきに或いは車幅方向の全幅にわたって形成されている。切欠部35の深さは任意に設定可能であるが、カウルグリル前部21の強度剛性を一定確保するため、カウルグリル前部21の板厚の50〜80%に設定することが好ましい。具体的には、切欠部35の最大深さを1.5mm、カウルグリル前部21の板厚を2.5mmに設定することになる。   As shown in FIG. 4, in order to promote deformation and destruction of the cowl grill front portion 21, the cowl grill upper portion 20 and the cowl grill front portion 21 are made of a synthetic resin material, and the front wall portion 26 of the cowl grill front portion 21 is formed. V-shaped notches 35 as weak portions are formed in the middle in the height direction at set intervals in the vehicle width direction or over the entire width in the vehicle width direction. The depth of the notch 35 can be arbitrarily set, but is preferably set to 50 to 80% of the plate thickness of the cowl grill front portion 21 in order to ensure the strength and rigidity of the cowl grill front portion 21 at a constant level. Specifically, the maximum depth of the cutout portion 35 is set to 1.5 mm, and the plate thickness of the cowl grill front portion 21 is set to 2.5 mm.

このように切欠部35を形成することで、図4に仮想線で示すように、ボンネット5が下側へ変形して、カウルグリル前部21に対して上側から荷重が作用したときに、切欠部35に沿ってカウルグリル前部21が屈曲変形することで、ボンネット5の変形を促進して、歩行者への衝撃力を緩和できることになる。   By forming the notch 35 in this manner, as shown by the phantom line in FIG. 4, when the bonnet 5 is deformed downward and a load acts on the cowl grill front part 21 from above, the notch By bending and deforming the cowl grill front part 21 along the part 35, the deformation of the bonnet 5 is promoted, and the impact force on the pedestrian can be reduced.

尚、切欠部35の形成位置は任意に設定可能であるが、例えば前壁部26と重合部27間における屈曲部36や、前壁部26と接続部28間における屈曲部37、或いはこれら屈曲部36、37付近に設けると、カウルグリル前部21の変形が一層促進されるので好ましい。また、高さ方向の途中部に1本だけ形成したが、高さ方向に複数本形成することも可能である。更に、車幅方向だけに限らず、車体前後方向や斜め方向などの任意の方向に切欠部35を形成することも可能である。要は、上方からの衝撃荷重により容易に屈曲変形することで、歩行者への衝撃力を緩和できるように構成されていれば、任意の位置に任意の本数設けることが可能である。また、カウルグリル前部21の縦断面形状は、クランク状やコ字状やZ字状などに形成できるが、図4に示すようになZ字状に形成すると、屈曲部36、37が鋭角状になって上方からの衝撃荷重によりより一層折れ曲がり易くなるので好ましい。   In addition, although the formation position of the notch part 35 can be set arbitrarily, for example, the bent part 36 between the front wall part 26 and the overlapping part 27, the bent part 37 between the front wall part 26 and the connecting part 28, or these bent parts Providing in the vicinity of the portions 36 and 37 is preferable because deformation of the cowl grill front portion 21 is further promoted. Moreover, although only one was formed in the middle part in the height direction, it is also possible to form a plurality in the height direction. Furthermore, not only the vehicle width direction but also the notch 35 can be formed in an arbitrary direction such as a vehicle body longitudinal direction or an oblique direction. The point is that any number can be provided at any position as long as it is configured to be easily bent and deformed by an impact load from above so that the impact force on the pedestrian can be reduced. Further, the longitudinal cross-sectional shape of the cowl grill front portion 21 can be formed in a crank shape, a U shape, a Z shape, or the like. However, if the cowl grille front portion 21 is formed in a Z shape as shown in FIG. This is preferable because it is more likely to be bent by an impact load from above.

また、V字状の切欠部35に代えて、断面矩形溝状の切欠部35を設けることも可能である。更に、カウルグリル前部21に、頂部が車幅方向に延びて車体前後方向に振幅する1乃至複数の矩形波状やサイン状などの断面波形状の波形部を形成し、この波形部を弱部とすることもできる。   Further, in place of the V-shaped cutout portion 35, a cutout portion 35 having a rectangular groove shape in cross section can be provided. Further, a corrugated portion having one or a plurality of rectangular wave shapes or sine wave shapes whose top portion extends in the vehicle width direction and swings in the longitudinal direction of the vehicle body is formed in the cowl grill front portion 21, and the corrugated portion is formed into a weak portion. It can also be.

更に、V字状の切欠部35に代えて、あるいはV字状の切欠部35と併用して、カウルグリル前部21とカウルグリル上部20とを接続する係合構造として、カウルグリル前部21に下方への衝撃荷重が作用したときに、係合が解除するように構成した係合構造を採用することもできる。具体的には、図6に示す係合構造のように、カウルグリル前部21の前壁部26に後方へ突出する係合フック38を形成し、この係合フック38に対応させてカウルグリル上部20の補強部25に係合孔39を形成し、係合フック38を係合孔39の下側の口縁に係合させて、カウルグリル前部21をカウルグリル上部20に固定することができる。この係合構造では、カウルグリル前部21に対して上方から衝撃荷重が作用すると、係合フック38のつけ根部分が破断して、カウルグリル前部21が下側へ自由に移動できるようになり、歩行者への衝撃荷重を緩和できることになる。   Further, instead of the V-shaped notch 35 or in combination with the V-shaped notch 35, as an engagement structure for connecting the cowl grill front part 21 and the cowl grill upper part 20, the cowl grill front part 21. It is also possible to employ an engagement structure configured such that the engagement is released when a downward impact load is applied. Specifically, like the engagement structure shown in FIG. 6, an engagement hook 38 that protrudes rearward is formed on the front wall portion 26 of the cowl grill front portion 21, and the cowl grille is associated with the engagement hook 38. An engagement hole 39 is formed in the reinforcing portion 25 of the upper portion 20, and the engagement hook 38 is engaged with the lower edge of the engagement hole 39 to fix the cowl grill front portion 21 to the cowl grill upper portion 20. Can do. In this engagement structure, when an impact load is applied to the cowl grill front portion 21 from above, the base portion of the engagement hook 38 is broken, and the cowl grill front portion 21 can freely move downward. The impact load on the pedestrian can be reduced.

更にまた、カウルグリル前部21をカウルグリル上部20よりも脆い素材で構成して、上方からの荷重によるカウルグリル前部21の座屈や変形を促進し、衝突エネルギーをより一層効率的に吸収することもできる。また、図3に仮想線で示すように、カウルグリル上部20に下側へ突出する補強リブ40を設け、カウルグリル前部21とカウルグリル上部20間における強度差を大きく設定し、上方からの荷重を弱部に作用し易くすると、弱部により確実に衝突エネルギーを吸収することが可能となる。尚、補強リブ40の配置や個数、長さや厚さや高さ、向きなどは任意に設定可能である。   Furthermore, the cowl grill front portion 21 is made of a material that is more brittle than the cowl grill upper portion 20, and the buckling and deformation of the cowl grill front portion 21 due to a load from above is promoted to absorb collision energy more efficiently. You can also Further, as shown by phantom lines in FIG. 3, a reinforcing rib 40 protruding downward is provided on the cowl grill upper portion 20 to set a large difference in strength between the cowl grill front portion 21 and the cowl grill upper portion 20. If the load is easily applied to the weak part, the collision energy can be absorbed with certainty by the weak part. The arrangement, number, length, thickness, height, direction, and the like of the reinforcing ribs 40 can be arbitrarily set.

その他、歩行者への衝撃荷重を緩和する構造として、図2、図7に示すように、カウルグリル15の両端部に側部開口41を形成し、この側部開口41を、カウルグリル15よりも軟質素材、例えば熱可塑性エラストマからなるカバー部材42で閉塞することもできる。このような構造を設けると、上方からの荷重に対するカウルグリル15の側部の強度剛性を低く設定して、ボンネット5の変形を促進でき、歩行者に対する衝撃力を緩和することができる。   In addition, as a structure for reducing the impact load on the pedestrian, as shown in FIGS. 2 and 7, side openings 41 are formed at both ends of the cowl grill 15, and the side openings 41 are formed by the cowl grill 15. Alternatively, the cover member 42 made of a soft material such as a thermoplastic elastomer can be used for closing. When such a structure is provided, the strength and rigidity of the side portion of the cowl grill 15 with respect to a load from above can be set low, the deformation of the bonnet 5 can be promoted, and the impact force on the pedestrian can be reduced.

自動車のタイヤハウス付近の要部斜視図Perspective view of the main part near the tire house of an automobile カウルグリルの斜視図Cowl grill perspective view 図1のIII-III線断面図III-III sectional view of FIG. カウルグリル前部付近の断面図Cross section near the front of the cowl grill 図1のV-V線断面図V-V cross-sectional view of Fig. 1 他の構成の係合構造を示す図4相当図FIG. 4 equivalent view showing the engagement structure of another configuration 図2のVII-VII線断面図VII-VII sectional view of FIG.

符号の説明Explanation of symbols

1 フロントサイドフレーム 2 エプロンレインフォースメント
3 エンジンルーム 4 エプロンパネル
5 ボンネット 6 タイヤハウス
7 サスタワー 7a 上壁部
8 フロントサスペンション 8a ボルト部材
9 ナット部材 10 フロントピラ
11 カウルアッパパネル 12 カウルロアパネル
13 カウル 14 カウルフロントパネル
15 カウルグリル 16 車室
17 ダッシュパネル 19 フロントウィンド
20 カウルグリル上部 21 カウルグリル前部
22 突出部 23 グリル部
24 堤部 25 補強部
26 前壁部 27 重合部
28 接続部 29 シール部材
30 ボンネットレインフォースメント
31 カウルグリル用吸音材 32 カウルグリル延設部
33 タイヤハウス用吸音材 34 タイヤハウス用吸音材
35 切欠部 36 屈曲部
37 屈曲部 38 係合フック
39 係合孔 40 補強リブ
41 側部開口 42 カバー部材
DESCRIPTION OF SYMBOLS 1 Front side frame 2 Apron reinforcement 3 Engine room 4 Apron panel 5 Bonnet 6 Tire house 7 Suspension tower 7a Upper wall part 8 Front suspension 8a Bolt member 9 Nut member 10 Front pillar 11 Cowl upper panel 12 Cowl lower panel 13 Cowl 14 Cowl front Panel 15 Cowl grill 16 Car compartment 17 Dash panel 19 Front window 20 Cowl grill upper part 21 Cowl grill front part 22 Projection part 23 Grill part 24 Bank part 25 Reinforcement part 26 Front wall part 27 Superposition part 28 Connection part 29 Seal member 30 Bonnet rain Force 31 Sound absorbing material for cowl grill 32 Cowl grill extending portion 33 Sound absorbing material for tire house 34 Sound absorbing material for tire house 35 Notch portion 36 Bending portion 37 Bending portion 38 Engagement Hook 39 Engagement hole 40 Reinforcing rib 41 Side opening 42 Cover member

Claims (4)

フロントウィンドの前縁部の上側からボンネットの後縁部の下方にわたって延びるカウルグリル上部と、カウルグリル上部の前縁部から下側へ延びるカウルグリル前部と有するカウルグリルを備えた自動車において、
前記カウルグリルにタイヤハウス上へ延びるカウルグリル延設部を設け、
前記カウルグリル前部に沿って車幅方向に延びるカウルグリル用吸音材を設け、
前記カウルグリル延設部に沿ってタイヤハウス用吸音材を設けた、
ことを特徴とする自動車の遮音構造。
In an automobile having a cowl grill having an upper cowl grill extending from the upper front edge of the front window to the lower rear edge of the bonnet, and a cowl grill front extending downward from the front edge of the upper cowl grill,
The cowl grille is provided with a cowl grille extending portion extending above the tire house,
A sound absorbing material for a cowl grille extending in the vehicle width direction along the front part of the cowl grille is provided,
A sound absorbing material for a tire house is provided along the cowl grille extension,
A sound insulation structure for automobiles.
前記カウルグリルをカウルグリル上部とカウルグリル前部とに分割構成するとともに、カウルグリル上部又はカウルグリル前部にカウルグリル延設部を一体的に設けた請求項1記載の自動車の遮音構造。   2. The sound insulation structure for an automobile according to claim 1, wherein the cowl grill is divided into a cowl grill upper part and a cowl grill front part, and a cowl grill extending part is integrally provided on the cowl grill upper part or the cowl grill front part. 前記タイヤハウス用吸音材をカウルグリル延設部とタイヤハウス間に設けた請求項1又は2記載の自動車の遮音構造。   The sound insulation structure for an automobile according to claim 1 or 2, wherein the sound absorbing material for a tire house is provided between the cowl grille extending portion and the tire house. 前記カウルグリル用吸音材の両端部にタイヤハウス用吸音材を一体的に設けた請求項1〜3のいずれか1項記載の自動車の遮音構造。
The sound insulation structure for an automobile according to any one of claims 1 to 3, wherein a sound absorbing material for a tire house is integrally provided at both ends of the sound absorbing material for the cowl grill.
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JP2011057027A (en) * 2009-09-08 2011-03-24 Nippon Plast Co Ltd Cowl cover device
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