JP2004166431A

JP2004166431A - Grommet

Info

Publication number: JP2004166431A
Application number: JP2002331224A
Authority: JP
Inventors: Junji Isono; 純次礒野; Yoshio Kamimura; 嘉男神村
Original assignee: Sumitomo Wiring Systems Ltd
Current assignee: Sumitomo Wiring Systems Ltd
Priority date: 2002-11-14
Filing date: 2002-11-14
Publication date: 2004-06-10

Abstract

<P>PROBLEM TO BE SOLVED: To improve the reliability of a grommet in terms of waterproofing property, to prevent deformation in one small-diameter cylindrical portion from spreading to other small-diameter cylindrical portions, and to promote reduction in the size of the grommet and the enhancement of wire insertion workability. <P>SOLUTION: The grommet 10 is so designed that it is fit onto a group of electric wires W1 to W3 and attached into a through-hole H formed in a floor panel P. The grommet 10 comprises a large-diameter cylindrical portion 11, which is fit into a through hole H in a floor panel P and has a closed portion 11a at one end; a panel anchoring portion 17, provided on the periphery of the large-diameter cylindrical portion 11 at the open other end 18; and a plurality of the small-diameter cylindrical portions 12 to 14 so formed that they are connected from the closed portion 11a to the hollow portion inside the large-diameter cylindrical portion 11. The grommet is provided with a recessed portion 15, which is formed at the base of each small-diameter cylindrical portions 12 to 14 and is extended throughout the circumferences of the small-diameter cylindrical portions. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は、グロメットに関し、詳しくは、車両の車室側からフロアパネルの下方に引き出し、フロアパネルに沿って配索する電線群に取り付け、フロアパネルの貫通穴に装着するグロメットとして好適に用いられるものである。
【０００２】
【従来の技術】
従来より自動車の車体パネルの貫通穴にワイヤハーネスを挿通する際には、防水とワイヤハーネスの保護のためにグロメットを取り付け、該グロメットを貫通穴に装着している。
この種のグロメットは従来より多数提案されており、例えば、特開平１１−８９０５４号公報で図６に示すグロメットが提案されている。該グロメット１は、３本の小径筒部２を突設する平坦面の支持部３の外周に円環溝５が凹設されており、最外周には車体パネルの貫通穴に嵌合される環状の車体係止凹部４が設けられている。上記グロメット１によると、円環溝５により小径筒部２の湾曲性が高まり、各小径筒部２に挿通された電線の配策方向の自由度を向上させることができる。
【０００３】
また、図７に示す特開２００１−１６０４３２９号公報に開示されたグロメット６は、一端側を閉鎖する閉鎖部７より３本の小径筒部８を突設しており、うち２本の小径筒部８の根元には蛇腹状の可撓部８ａを設けていると共に、最外周に車体パネルの貫通穴に嵌合される環状の車体係止凹部９が設けられている。
上記図６あるいは図７に示すグロメット１、６によると、円環溝５あるいは可撓部８ａの存在により、小径筒部２、８の屈曲変形が車体係止凹部４、９に及びにくく、車体パネルと車体係止凹部４、９との密着が維持され止水性が向上される。
【０００４】
【特許文献１】
特開平１１−８９０５４号公報
【０００５】
【特許文献２】
特開２００１−１６０３２９号公報
【０００６】
【発明が解決しようとする課題】
しかしながら、図６に示すグロメット１によると、小径筒部２に挿通された電線が引っ張られることにより１つの小径筒部２が屈曲すると、その変形負荷が支持部３を介して隣接する他の小径筒部２に伝達して、該他の小径筒部２に挿通される電線の配策方向が捩じれる恐れがある。
さらに、小径筒部２に電線を貫通する作業では、専用の冶具（図示せず）で小径筒部２を拡げて行うが、小径筒部２は三角配置されているので互いに干渉しやすく作業性が悪い問題もある。
【０００７】
また、図７に示すグロメット６によると、小径筒部８ごとに可撓部８ａが設けられているため、１つの小径筒部８の変形が他の小径筒部８に及びにくくなっているものの、蛇腹状の可撓部８ａ同士が干渉するのを防ぐために各小径筒部８の間にある程度の空間を設定する必要があるため、グロメット６の小型・省スペース化に対応しにくい問題がある。また、図６のグロメット１と同様に、各小径筒部８は三角配置されているので、専用冶具を用いた小径筒部８への電線貫通作業の際に互いに干渉しやすく作業性が悪い問題もある。
【０００８】
本発明は、上記問題に鑑みてなされたもので、グロメットの止水信頼性を向上させると共に、１つの小径筒部の変形が他の小径筒部へ及ばないようにし、かつ、グロメットの小型化および電線挿通作業性の向上を図ることを課題としている。
【０００９】
【課題を解決するための手段】
上記課題を解決するため、本発明は、電線群に外装して車体パネルに穿設された貫通穴に装着するグロメットであって、
上記車体パネルの貫通穴に内嵌され一端側に閉鎖部を有する大径筒部と、該大径筒部の他端開口側の外周に設けられたパネル固定部と、上記閉鎖部より大径筒部内の中空部に連通させて穿設する複数の小径筒部とを備え、
上記複数の各小径筒部の根元の全周に沿う凹部を設けていることを特徴とするグロメットを提供している。
【００１０】
上記構成とすると、小径筒部の根元部の周縁に上記凹部を設けていることで、上記小径筒部が屈曲して引っ張られても凹部で吸収して上記大径筒部および上記パネル固定部に変形が及ばないようにしているので、車体パネルとの密着性が確保され止水信頼性を向上させることができる。
しかも、各小径筒部の根元の全周に沿わせて包囲するように凹部を設けているので、隣接する小径筒部の間には凹部が介在し、１つの小径筒部の変形が他の小径筒部に及ばないように吸収することができる。
【００１１】
上記複数の小径筒部は、上記閉鎖部より一列に並んだ状態で突出させ、上記各小径筒部の間の上記凹部は共通凹部として、全小径筒部の根元の凹部を連続させている。
【００１２】
ワイヤハーネスを構成する電線をそれぞれの小径筒部に挿通するには、専用の冶具を用いて小径筒部を拡げて挿通するが、上記のように複数の小径筒部が一列に並べて配置されることで、上記冶具を用いた電線の挿通作業も容易にすることができる。また、グロメットの各小径筒部から導出された各電線を一列で配策する場合には、上記のように各小径筒部を予め一列に並べることにより、グロメット挿通時点で電線が一列に並べられ電線の絡まりを無くすことができる。
さらに、上記凹部は全小径筒部の根元に連続させた共通凹部としているので、各小径筒部を互いに近接して配置することができ、グロメットの小型化および上記車体パネルの貫通孔の小径化を図ることができる。
【００１３】
上記パネル固定部は、上記大径筒部の他端開口側の周壁を厚肉とし、その外周面に環状に車体係止凹部を設け、該車体係止凹部を車体パネルの貫通穴の内周縁を係止させる構成としている。
【００１４】
あるいは、上記パネル固定部は、上記大径筒部の他端開口の周縁よりフランジ状に突出させると共にその内面側にシールリップ部を突設し、かつ、該パネル固定部の外面側に金属板を組み付け、該金属板と上記パネル固定部に穿設したボルト穴を通してボルトを車体パネルにネジ締めし、上記パネル固定部のシールリップを車体パネルの外面に圧接させる構成としても好適である。
【００１５】
上記構成とすると、上記金属板で補強されたパネル固定部のシールリップ部を車体パネルへ押圧させてボルト締めにより強固に固定しているので、さらに止水信頼性を向上させることができる。
【００１６】
上記車体パネルはフロアパネルであり、該フロアパネルの穿設した上記貫通穴に上記グロメットを装着し、上記小径筒部に電線を密嵌させて挿通し、上記大径筒部の他端開口よりフロアパネルの下方に引き出す構成としている。
つまり、上述した止水信頼性の高いグロメットは、被水領域と禁水領域とを仕切る床下のフロアパネルの貫通穴に好適に用いることができる。
【００１７】
【発明の実施の形態】
本発明の実施形態を図面を参照して説明する。
熱機関とモータとを備えたハイブリッド自動車では、車両後部に配置された電池パックと車両前方の電気接続箱等とを接続する太物電線（電線サイズ：８ｓｑあるいは２０ｓｑ）を、他機器へのノイズの影響を考慮して、床下のフロアパネル（車体パネル）を貫通して車外（床下）に配策することが多く、電池パック付近で電線を車外から車内へと導く貫通穴をフロアパネルに設けて、該貫通穴をグロメットで密封している。
【００１８】
図１および図２は、ハイブリッド自動車のフロアパネルＰに穿設された貫通穴Ｈに装着するグロメット１０であって、ゴムまたはエラストマーにより一体成形されている。
グロメット１０は、フロアパネルＰの貫通穴Ｈに内嵌され一端側に閉鎖部１１ａを有する大径筒部１１と、該大径筒部１１の他端開口１８側の外周面に設けられた環状の車体係止凹部１７と、該車体係止凹部１７の他端側に設けられた厚肉の周壁部１６と、閉鎖部１１ａより突出し大径筒部１１内の中空部に連通させて穿設する３本の小径筒部１２〜１４と、該小径筒部１２〜１４の根元の全周に沿って設けられた凹部１５とを備えている。
【００１９】
小径筒部１２〜１４は、閉鎖部１１ａより一列に並んだ状態で突出させ、小径筒部１２〜１４の先端にはテープ巻き舌片１２ａ〜１４ａを突出していると共に、内面側に密着用の環状リブ１２ｂ〜１４ｂを突出しており、また、小径筒部１４〜１６は中間位置から根元にかけて若干拡径する傾斜部１２ｃ〜１４ｃを設けている。
【００２０】
凹部１５は、小径筒部１２〜１４の根元の形状に沿って連続して凹設された共通凹部であり、小径筒部１４〜１６の１本ずつを包囲している。
大径筒部１１は、フロアパネルＰの貫通穴Ｈに内嵌挿入するための傾斜壁１１ｂを設けており、周壁部１６の傾斜壁１１ｂ側にはシールリップ部１６ａを突出させている。
【００２１】
図３はグロメット１０のフロアパネルＰの貫通穴Ｈへの装着状態を示す。各小径筒部１２〜１４を専用の冶具で拡げて夫々に３本の電線Ｗ１〜Ｗ３を挿通し、環状リブ１２ｂ〜１４ｂと電線Ｗ１〜Ｗ３とが密着した状態でテープ巻き舌片１２ａ〜１４ａごと電線Ｗ１〜Ｗ３をテープＴで巻き付け固定している。
そして、グロメット１０を車外（Ｙ）側から車内（Ｘ）側へと挿入し、車体係止凹部１７にフロアパネルＰの貫通穴Ｈの周縁を外嵌係止して、傾斜壁１１ｂと厚肉の周壁部１６より突出したシールリップ１６ａとの間で圧接挟持している。
【００２２】
上記構成のグロメット１０によると、小径筒部１２〜１４の根元部の周縁に凹部１５を設けていることで、電線が屈曲して小径筒部１２〜１４が屈曲して引っ張られても凹部１５で吸収されて、シールリップ部１６ａとフロアパネルＰとの密着部分に変形が及ばないようにしているので、密着性が確保され止水信頼性を向上させることができる。
【００２３】
電線を夫々の小径筒部１２〜１４に挿通するには、専用の冶具を用いて小径筒部１２〜１４を拡げて挿通するが、３つの小径筒部１２〜１４が一列に並べて配置されることで、上記冶具を用いた電線の挿通作業も容易にすることができる。さらに、凹部１５は全小径筒部１２〜１４の根元に連続させた共通凹部としているので、各小径筒部１２〜１４を互いに近接して配置することができ、グロメット１０の小型化およびフロアパネルＰの貫通孔Ｈの小径化を図ることができると共に、隣接する小径筒部１２〜１４の間には凹部１５を連続して介在させ、各小径筒部１２〜１４の根元部の全周が凹部１５で包囲されるようにしているので、１つの小径筒部１２の変形が他の小径筒部１３、１４へと及ばないように吸収することができる。
【００２４】
図４および図５は第２実施形態を示す。
第１実施形態との相違点は、グロメット２０をボルト締めでフロアパネルＰに固定している点である。
【００２５】
本実施形態のグロメット２０は、金属板３０をゴムまたはエラストマーからなる弾性材でインサート成形し、弾性材からなるグロメット本体２９と金属板３０とを一体化させており、大径筒部２１の他端開口２７の周縁よりフランジ部２６を連続して突出させ、金属板３０の一部は外面側に露出している。
【００２６】
金属板３０は、図４および図５に示すように、略菱形状であり、中央に穿設された大径の挿通穴３０ｃと、該挿通穴３０ｃを挟んで金属板３０の長軸上に配置され円形状に膨出した一対のボルト座部３０ａと、該ボルト座部３０ａの中央に穿設されたボルト孔３０ａ−１と、挿通穴３０ｃの周囲に等間隔をあけて周状に配置された複数の小孔３０ｂとを備えている。小孔３０ｂは直径φ１〜１０ｍｍの円孔とし、本実施形態ではφ３ｍｍの小孔３０ｂを周状に１２個配置している。
【００２７】
グロメット本体２９は、金属板３０の挿通穴３０ｃを閉鎖する閉鎖部２１ａと傾斜壁２１ｂとを有する大径筒部２１と、金属板３０を被覆するフランジ部２６とを連続的に備え、太物の電線を１本ずつ密着させて挿通する複数の小径筒部２２〜２４を閉鎖部２１ａより一列に突出させており、大径筒部２１の下方には小径筒部２２〜２４と連通する大径の開口２７を備えている。
【００２８】
３つの小径筒部２２〜２４の根元の周縁には、連続した１つの凹部２５が小径筒部２２〜２４の形状に沿って設けられ、小径筒部２２〜２４の１本ずつを包囲するように凹設している。小径筒部２２〜２４の先端にはテープ巻き舌片２２ａ〜２４ａを突出していると共に、内面側に密着用の環状リブ２２ｂ〜２４ｂを突出している。
【００２９】
フランジ部２６は、金属板３０のボルト座部３０ａを露出した状態で被覆しており、金属板３０の菱形部分の上面側はボルト座部３０ａ以外を外縁まで被覆して上被覆部２６ａとしていると共に、金属板３０の下面側は小孔３０ｂより若干外側までを円形状に被覆して下被覆部２６ｂとしている。
この際、弾性材が金属板３０の小孔３０ｂに充填した状態で成形されて上被覆部２６ａと下被覆部２６ｂとを繋ぐことにより、グロメット本体２９と金属板３０とを強固に一体化させている。
フランジ部２６の上被覆部２６ａには大径筒部２１の外周側でボルト座部３０ａの内周側に内シールリップ２６ｃを円周状に突出させていると共に、ボルト座部３０ａより外側の菱形部分の外縁に沿って外シールリップ２６ｄを突出させている。
【００３０】
上記グロメット２０を大径筒部２１が貫通穴Ｈに内嵌するようにフロアパネルＰの車外（Ｙ）側から車内（Ｘ）側へ取り付けると共に、グロメット２０のボルト孔３０ａ−１にフロアパネルＰに埋め込まれたスタッドボルトＢを貫通させ、ナットＮで締結固定している。
このようにグロメット２０をボルト締め固定することで、大径筒部２１の傾斜壁２１ｂを貫通穴Ｈの周縁に密嵌すると共に、内シールリップ部２６ｃと外シールリップ部２６ｂをフロアパネルＰに圧接させている。
【００３１】
上記構成とすると、小径筒部２２〜２４の根元部の周縁に沿って凹部２５を連続的に凹設し、小径筒部２２〜２４が屈曲して引っ張られても凹部２５で吸収して傾斜壁２１ｂや内・外シールリップ２６ｃ、２６ｄに変形が及ばないようにしているので、フロアパネルＰとの密着性が確保され止水信頼性を向上させることができる。
【００３２】
しかも、金属板３０を被覆するフランジ部２６の内シールリップ部２６ｃおよび外シールリップ部２６ｄをフロアパネルＰに圧接させ、かつ、大径筒部２１を貫通穴Ｈ周縁に圧接させてボルト締めで強固に固定しているので、より確実にフロアパネルＰとの密着が維持されて止水信頼性を大幅に向上される。
なお、シールリップ部２６ｃ、２６ｄを内外に２重に設けていることで、ボルトＢにナットＮを締結する際には外シールリップ２６ｄによりガタつきを防止することができる。
【００３３】
【発明の効果】
以上の説明より明らかなように、本発明によれば、上記小径筒部が屈曲して引っ張られても上記凹部で吸収され上記パネル固定部に変形が及ばないので、車体パネルとの密着性が確保され止水信頼性を向上させることができる。さらに、上記凹部は全小径筒部の根元に連続させた共通凹部として、各小径筒部の根元部の全周が凹部で包囲されるので、１つの小径筒部の屈曲変形が凹部で吸収されて、他の小径筒部に影響するのを防止することができると共に、互いの小径筒部を近接して配置することができ、グロメットの小型化および上記車体パネルの貫通孔の小径化を図ることもできる。
また、上記のように複数の小径筒部が一列に並べて配置されることにより、専用の冶具を用いて小径筒部を拡げて電線を挿通する作業も容易にすることができる。
【図面の簡単な説明】
【図１】本発明の第１実施形態のグロメットの斜視図である。
【図２】グロメットの断面図である。
【図３】フロアパネルへの装着後の断面図である。
【図４】第２実施形態のグロメットの上面図である。
【図５】図４のＩ−Ｉ線断面図である。
【図６】従来例のグロメットを示す斜視図である。
【図７】別の従来例のグロメットを示す斜視図である。
【符号の説明】
１０、２０グロメット
１１大径筒部
１１ａ閉鎖部
１２〜１４小径筒部
１５凹部
１７車体係止凹部
２６フランジ部
３０金属板
３０ａ−１ボルト孔
Ｂスタッドボルト
Ｎナット
Ｔテープ
Ｘ車内
Ｙ車外[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a grommet, and in particular, is preferably used as a grommet to be pulled out from a cabin side of a vehicle below a floor panel, attached to a group of electric wires routed along the floor panel, and attached to a through hole of the floor panel. Things.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, when a wire harness is inserted into a through-hole of a vehicle body panel, a grommet is attached for waterproofing and protection of the wire harness, and the grommet is attached to the through-hole.
Many grommets of this type have been conventionally proposed, and for example, Japanese Patent Application Laid-Open No. 11-89054 discloses a grommet shown in FIG. The grommet 1 has an annular groove 5 recessed in the outer periphery of a flat surface supporting portion 3 on which three small-diameter cylindrical portions 2 protrude, and the outermost periphery is fitted into a through hole of a vehicle body panel. An annular vehicle body locking recess 4 is provided. According to the grommet 1, the bendability of the small-diameter cylindrical portion 2 is enhanced by the annular groove 5, and the degree of freedom in the direction in which the electric wires inserted into the small-diameter cylindrical portions 2 are routed can be improved.
[0003]
The grommet 6 disclosed in Japanese Patent Application Laid-Open No. 2001-160329 shown in FIG. 7 has three small-diameter cylindrical portions 8 protruding from a closing portion 7 that closes one end side. A bellows-shaped flexible portion 8a is provided at the base of the portion 8, and an annular vehicle body engaging concave portion 9 which is fitted into a through hole of the vehicle body panel is provided at the outermost periphery.
According to the grommets 1 and 6 shown in FIG. 6 or FIG. 7, the bending deformation of the small-diameter cylindrical portions 2 and 8 is less likely to reach the vehicle body engaging concave portions 4 and 9 due to the presence of the annular groove 5 or the flexible portion 8a. The close contact between the panel and the vehicle body locking recesses 4 and 9 is maintained, and the water stoppage is improved.
[0004]
[Patent Document 1]
JP-A-11-89054
[Patent Document 2]
JP 2001-160329 A
[Problems to be solved by the invention]
However, according to the grommet 1 shown in FIG. 6, when one small-diameter tubular portion 2 is bent by pulling the electric wire inserted through the small-diameter tubular portion 2, the deformation load is applied to the other small-diameter tubular portion via the support portion 3. There is a possibility that the routing direction of the electric wire transmitted to the cylindrical portion 2 and inserted into the other small-diameter cylindrical portion 2 may be twisted.
Further, in the work of penetrating the electric wire through the small-diameter cylindrical portion 2, the small-diameter cylindrical portion 2 is expanded by using a special jig (not shown). But there are also bad problems.
[0007]
According to the grommet 6 shown in FIG. 7, the flexible portion 8 a is provided for each of the small-diameter cylindrical portions 8, so that the deformation of one small-diameter cylindrical portion 8 is less likely to reach the other small-diameter cylindrical portion 8. In order to prevent the bellows-like flexible portions 8a from interfering with each other, it is necessary to set a certain amount of space between the small-diameter cylindrical portions 8, so that there is a problem that it is difficult to cope with the grommet 6 being small and space-saving. . Also, as in the case of the grommet 1 shown in FIG. 6, since the small-diameter cylindrical portions 8 are arranged in a triangular shape, they easily interfere with each other when the electric wire penetrates the small-diameter cylindrical portion 8 using a special jig. There is also.
[0008]
The present invention has been made in view of the above problems, and improves the water stopping reliability of a grommet, prevents deformation of one small-diameter cylindrical portion from reaching another small-diameter cylindrical portion, and reduces the size of the grommet. Another object of the present invention is to improve the wire insertion workability.
[0009]
[Means for Solving the Problems]
In order to solve the above problems, the present invention is a grommet that is mounted on a through hole formed in a vehicle body panel, which is provided on a wire group.
A large-diameter cylindrical portion fitted inside the through hole of the vehicle body panel and having a closed portion on one end side, a panel fixing portion provided on the outer periphery on the other end opening side of the large-diameter cylindrical portion, and a larger diameter than the closed portion. A plurality of small-diameter cylindrical portions that are bored in communication with the hollow portion in the cylindrical portion,
There is provided a grommet characterized in that a concave portion is provided along the entire periphery of the root of each of the plurality of small-diameter cylindrical portions.
[0010]
With the above configuration, the concave portion is provided on the periphery of the root portion of the small-diameter cylindrical portion, so that even if the small-diameter cylindrical portion is bent and pulled, the small-diameter cylindrical portion absorbs the concave portion and absorbs the large-diameter cylindrical portion and the panel fixing portion. , The adhesion to the vehicle body panel is ensured, and the water stoppage reliability can be improved.
In addition, since the concave portions are provided so as to surround the entire circumference of the base of each small-diameter cylindrical portion, a concave portion is interposed between adjacent small-diameter cylindrical portions, and the deformation of one small-diameter cylindrical portion is reduced by another. It can be absorbed so as not to reach the small-diameter cylindrical portion.
[0011]
The plurality of small-diameter cylindrical portions are protruded in a state of being lined up from the closed portion, and the concave portion between the small-diameter cylindrical portions is a common concave portion, and the concave portion at the root of all the small-diameter cylindrical portions is continuous.
[0012]
In order to insert the electric wire constituting the wire harness into each small-diameter cylindrical portion, the small-diameter cylindrical portion is expanded and inserted using a dedicated jig, but a plurality of small-diameter cylindrical portions are arranged in a line as described above. Thereby, the insertion work of the electric wire using the jig can also be facilitated. Also, when arranging the electric wires derived from the respective small-diameter cylindrical portions of the grommet in a single line, by arranging the respective small-diameter cylindrical portions in advance as described above, the electric wires are arranged in a single line at the time of inserting the grommet. The tangling of the electric wires can be eliminated.
Further, since the recess is a common recess connected to the base of all the small-diameter cylindrical portions, the small-diameter cylindrical portions can be arranged close to each other, so that the size of the grommet and the diameter of the through hole of the vehicle body panel can be reduced. Can be achieved.
[0013]
The panel fixing portion has a thicker peripheral wall on the other end opening side of the large-diameter cylindrical portion, and has a vehicle body locking concave portion formed annularly on the outer peripheral surface thereof, and the vehicle body locking concave portion has an inner peripheral edge of a through hole of the vehicle body panel. Are locked.
[0014]
Alternatively, the panel fixing portion projects in a flange shape from the peripheral edge of the other end opening of the large-diameter cylindrical portion, and a seal lip is protruded on the inner surface side thereof, and a metal plate is formed on the outer surface side of the panel fixing portion. It is also preferable that a bolt is screwed to the vehicle body panel through the metal plate and a bolt hole formed in the panel fixing portion, and the seal lip of the panel fixing portion is pressed against the outer surface of the vehicle body panel.
[0015]
With this configuration, the seal lip portion of the panel fixing portion reinforced by the metal plate is pressed against the vehicle body panel and firmly fixed by bolting, so that the water stopping reliability can be further improved.
[0016]
The vehicle body panel is a floor panel, the grommet is mounted in the through hole formed in the floor panel, an electric wire is closely fitted and inserted into the small-diameter cylindrical portion, and the other end of the large-diameter cylindrical portion is opened. It is configured to be pulled out below the floor panel.
That is, the above-described grommet having high water stopping reliability can be suitably used for a through-hole in a floor panel under the floor that separates a water-receiving area from a water-inhibiting area.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to the drawings.
In a hybrid vehicle equipped with a heat engine and a motor, a thick electric wire (wire size: 8 sq or 20 sq) connecting a battery pack disposed at the rear of the vehicle to an electric connection box or the like at the front of the vehicle generates noise to other devices. In consideration of the effects of air conditioning, it is often arranged outside the vehicle (under the floor) through the floor panel (body panel) under the floor, and a through hole is provided in the floor panel near the battery pack to guide the electric wires from outside the vehicle to the inside of the vehicle The through hole is sealed with a grommet.
[0018]
FIGS. 1 and 2 show a grommet 10 to be mounted in a through hole H formed in a floor panel P of a hybrid vehicle, which is integrally formed of rubber or elastomer.
The grommet 10 has a large-diameter cylindrical portion 11 fitted inside the through hole H of the floor panel P and having a closed portion 11a on one end side, and an annular shape provided on the outer peripheral surface of the large-diameter cylindrical portion 11 on the other end opening 18 side. The vehicle body locking concave portion 17, a thick peripheral wall portion 16 provided on the other end side of the vehicle body locking concave portion 17, and a hole protruding from the closing portion 11 a and communicating with a hollow portion in the large-diameter cylindrical portion 11. Three small-diameter cylindrical portions 12 to 14 and a concave portion 15 provided along the entire circumference of the root of the small-diameter cylindrical portions 12 to 14.
[0019]
The small-diameter cylindrical portions 12 to 14 are protruded in a state of being lined up in a line from the closing portion 11a, and tape-wrapped tongue pieces 12a to 14a are protruded from the distal ends of the small-diameter cylindrical portions 12 to 14, and are provided on the inner surface side for close contact. The annular ribs 12b to 14b protrude, and the small-diameter cylindrical portions 14 to 16 are provided with inclined portions 12c to 14c that slightly increase in diameter from the intermediate position to the base.
[0020]
The concave portion 15 is a common concave portion continuously formed along the shape of the base of the small-diameter cylindrical portions 12 to 14 and surrounds each of the small-diameter cylindrical portions 14 to 16.
The large-diameter cylindrical portion 11 is provided with an inclined wall 11b for being inserted into the through hole H of the floor panel P, and a seal lip portion 16a protrudes from the inclined wall 11b side of the peripheral wall portion 16.
[0021]
FIG. 3 shows a mounting state of the grommet 10 in the through hole H of the floor panel P. Each of the small-diameter cylindrical portions 12 to 14 is expanded with a dedicated jig, and three electric wires W1 to W3 are inserted through the small-diameter cylindrical portions 12 to 14 respectively. Each of the wires W1 to W3 is wound and fixed with a tape T.
Then, the grommet 10 is inserted from the outside of the vehicle (Y) to the inside of the vehicle (X), and the periphery of the through hole H of the floor panel P is externally fitted and locked in the vehicle body locking concave portion 17, so that the inclined wall 11b and the thick wall are formed. And pressed against a seal lip 16 a protruding from the peripheral wall portion 16.
[0022]
According to the grommet 10 having the above-described configuration, since the concave portion 15 is provided on the periphery of the root portion of the small-diameter cylindrical portions 12 to 14, even if the electric wire is bent and the small-diameter cylindrical portions 12 to 14 are bent and pulled, the concave portion 15 is formed. , So that the deformation does not reach the contact portion between the seal lip portion 16a and the floor panel P, so that the adhesion can be secured and the water stopping reliability can be improved.
[0023]
To insert an electric wire into each of the small-diameter cylindrical portions 12 to 14, the small-diameter cylindrical portions 12 to 14 are expanded and inserted using a dedicated jig, but three small-diameter cylindrical portions 12 to 14 are arranged in a line. Thereby, the insertion work of the electric wire using the jig can also be facilitated. Further, since the concave portion 15 is a common concave portion continuous to the root of all the small-diameter cylindrical portions 12 to 14, the small-diameter cylindrical portions 12 to 14 can be arranged close to each other, so that the grommet 10 can be downsized and the floor panel can be reduced. The diameter of the through hole H of P can be reduced, and the concave portion 15 is continuously interposed between the adjacent small diameter cylindrical portions 12 to 14 so that the entire circumference of the root portion of each small diameter cylindrical portion 12 to 14 is reduced. Since it is surrounded by the concave portion 15, it is possible to absorb the deformation of one small-diameter cylindrical portion 12 so as not to reach the other small-diameter cylindrical portions 13 and 14.
[0024]
4 and 5 show a second embodiment.
The difference from the first embodiment is that the grommet 20 is fixed to the floor panel P by bolting.
[0025]
In the grommet 20 of the present embodiment, the metal plate 30 is insert-molded with an elastic material made of rubber or elastomer, and the grommet main body 29 made of the elastic material and the metal plate 30 are integrated. The flange portion 26 is continuously protruded from the peripheral edge of the end opening 27, and a part of the metal plate 30 is exposed on the outer surface side.
[0026]
As shown in FIGS. 4 and 5, the metal plate 30 has a substantially rhombic shape, and has a large-diameter insertion hole 30 c formed in the center and a long axis of the metal plate 30 with the insertion hole 30 c interposed therebetween. A pair of bolt seats 30a arranged and bulging in a circular shape, a bolt hole 30a-1 formed at the center of the bolt seat 30a, and circumferentially spaced around the insertion hole 30c at equal intervals. And a plurality of small holes 30b. The small holes 30b are circular holes having a diameter of φ1 to 10 mm, and in the present embodiment, twelve small holes 30b having a diameter of 3 mm are arranged.
[0027]
The grommet main body 29 continuously includes a large-diameter cylindrical portion 21 having a closing portion 21a for closing the insertion hole 30c of the metal plate 30 and an inclined wall 21b, and a flange portion 26 for covering the metal plate 30. A plurality of small-diameter cylindrical portions 22 to 24 through which the electric wires are inserted one by one are projected from the closing portion 21 a in a line, and a large-diameter cylindrical portion 22 to 24 communicates with the small-diameter cylindrical portions 22 to 24 below the large-diameter cylindrical portion 21. An opening 27 having a diameter is provided.
[0028]
One continuous concave portion 25 is provided along the shape of the small-diameter cylindrical portions 22 to 24 on the periphery of the base of the three small-diameter cylindrical portions 22 to 24 so as to surround each of the small-diameter cylindrical portions 22 to 24. It is recessed. Tape wound tongue pieces 22a to 24a protrude from the distal ends of the small-diameter cylindrical portions 22 to 24, and annular ribs 22b to 24b for close contact protrude from the inner surface side.
[0029]
The flange portion 26 covers the bolt seat portion 30a of the metal plate 30 in a state where the bolt seat portion 30a is exposed, and the upper surface side of the rhombic portion of the metal plate 30 covers the portion other than the bolt seat portion 30a to the outer edge to form an upper covering portion 26a. At the same time, the lower surface side of the metal plate 30 is covered with a circular shape slightly outside the small holes 30b to form a lower covering portion 26b.
At this time, the grommet main body 29 and the metal plate 30 are strongly integrated by being formed in a state where the elastic material is filled in the small holes 30b of the metal plate 30 and connecting the upper coating portion 26a and the lower coating portion 26b. ing.
An inner seal lip 26c is circumferentially protruded from the upper covering portion 26a of the flange portion 26 to the outer peripheral side of the large-diameter cylindrical portion 21 and to the inner peripheral side of the bolt seat portion 30a. An outer seal lip 26d protrudes along the outer edge of the rhombus.
[0030]
The grommet 20 is mounted from the outside (Y) side of the floor panel P to the inside (X) side of the floor panel P so that the large-diameter cylindrical portion 21 is fitted into the through hole H, and the floor panel P is inserted into the bolt hole 30a-1 of the grommet 20. The stud bolt B embedded in the hole is penetrated and fastened and fixed with a nut N.
By fixing the grommet 20 with the bolts in this manner, the inclined wall 21b of the large-diameter cylindrical portion 21 is closely fitted to the periphery of the through hole H, and the inner seal lip portion 26c and the outer seal lip portion 26b are fixed to the floor panel P. It is pressed.
[0031]
With the above configuration, the concave portion 25 is continuously formed along the periphery of the base portion of the small-diameter cylindrical portions 22 to 24, and even if the small-diameter cylindrical portions 22 to 24 are bent and pulled, the concave portions 25 absorb and tilt. Since the wall 21b and the inner / outer seal lips 26c and 26d are not deformed, the adhesion to the floor panel P is ensured, and the water stopping reliability can be improved.
[0032]
In addition, the inner seal lip portion 26c and the outer seal lip portion 26d of the flange portion 26 covering the metal plate 30 are pressed against the floor panel P, and the large-diameter cylindrical portion 21 is pressed against the peripheral edge of the through hole H and bolted. Since it is firmly fixed, the close contact with the floor panel P is more reliably maintained, and the water stopping reliability is greatly improved.
In addition, since the seal lip portions 26c and 26d are provided double inside and outside, when the nut N is fastened to the bolt B, rattling can be prevented by the outer seal lip 26d.
[0033]
【The invention's effect】
As is apparent from the above description, according to the present invention, even if the small-diameter cylindrical portion is bent and pulled, the small-diameter cylindrical portion is absorbed by the concave portion and does not reach the panel fixing portion, so that the adhesion to the vehicle body panel is reduced. As a result, the reliability of water stoppage can be improved. Further, the concave portion is a common concave portion which is continuous with the root of all the small-diameter cylindrical portions, and the entire periphery of the root portion of each small-diameter cylindrical portion is surrounded by the concave portion, so that the bending deformation of one small-diameter cylindrical portion is absorbed by the concave portion. Thus, it is possible to prevent influence on other small-diameter cylindrical portions, and to arrange the small-diameter cylindrical portions in close proximity to each other, thereby reducing the size of the grommet and the diameter of the through hole of the vehicle body panel. You can also.
In addition, by arranging the plurality of small-diameter tubular portions in a line as described above, the operation of expanding the small-diameter tubular portion and inserting an electric wire using a dedicated jig can be facilitated.
[Brief description of the drawings]
FIG. 1 is a perspective view of a grommet according to a first embodiment of the present invention.
FIG. 2 is a sectional view of a grommet.
FIG. 3 is a cross-sectional view after mounting on a floor panel.
FIG. 4 is a top view of a grommet according to a second embodiment.
FIG. 5 is a sectional view taken along line II of FIG. 4;
FIG. 6 is a perspective view showing a grommet of a conventional example.
FIG. 7 is a perspective view showing another conventional grommet.
[Explanation of symbols]
10, 20 Grommet 11 Large-diameter cylindrical portion 11a Closed portion 12 to 14 Small-diameter cylindrical portion 15 Concave portion 17 Car body retaining concave portion 26 Flange portion 30 Metal plate 30a-1 Bolt hole B Stud bolt N Nut T Tape X Inside car Y Outside car

Claims

A grommet that is mounted on a through hole drilled in a body panel to be exteriorly covered with a group of electric wires,
A large-diameter cylindrical portion fitted inside the through hole of the vehicle body panel and having a closed portion on one end side, a panel fixing portion provided on the outer periphery on the other end opening side of the large-diameter cylindrical portion, and a larger diameter than the closed portion. A plurality of small-diameter cylindrical portions that are bored in communication with the hollow portion in the cylindrical portion,
A grommet, characterized in that a recess is provided along the entire periphery of the root of each of the plurality of small-diameter cylindrical portions.

The plurality of small-diameter cylindrical portions are projected in a state of being lined up from the closed portion, and the concave portion between the small-diameter cylindrical portions is a common concave portion, and a concave portion at the root of all the small-diameter cylindrical portions is continuous. Item 2. A grommet according to item 1.

The panel fixing portion has a thicker peripheral wall on the other end opening side of the large-diameter cylindrical portion, and has a vehicle body locking concave portion formed in an annular shape on an outer peripheral surface thereof, and the vehicle body locking concave portion has an inner peripheral edge of a through hole of the vehicle body panel. The grommet according to claim 1 or 2, wherein the grommet is configured to lock.

The panel fixing portion projects in a flange shape from the peripheral edge of the other end opening of the large-diameter cylindrical portion, and a seal lip portion is protruded on an inner surface side thereof, and a metal plate is assembled on an outer surface side of the panel fixing portion. 3. The structure according to claim 1, wherein a bolt is screwed to the vehicle body panel through the metal plate and a bolt hole formed in the panel fixing portion, and a seal lip of the panel fixing portion is pressed against an outer surface of the vehicle body panel. The grommet described in.

The vehicle body panel is a floor panel, the grommet is attached to the through hole formed in the floor panel, an electric wire is closely fitted and inserted into the small-diameter cylindrical portion, and the other end of the large-diameter cylindrical portion is opened. The grommet according to any one of claims 1 to 4, wherein the grommet is configured to be pulled out below the floor panel.