JP3791819B2

JP3791819B2 - Box waterproof structure

Info

Publication number: JP3791819B2
Application number: JP02171099A
Authority: JP
Inventors: 秀俊佐藤; ゼネセックジェフリー
Original assignee: Yazaki Corp
Current assignee: Yazaki Corp
Priority date: 1999-01-29
Filing date: 1999-01-29
Publication date: 2006-06-28
Anticipated expiration: 2019-01-29
Also published as: JP2000223857A

Description

【０００１】
【発明の属する技術分野】
本発明は、自動車等の車両に搭載する各種のボックス、例えば、エンジンルームに設けられ電気接続箱等を収容する防水ボックス等のボックスの防水構造に関する。
【０００２】
【従来の技術】
従来のボックスの防水構造として、例えば実開平１−５８９８３号公報に開示されたものが知られている。この防水構造にあっては、図１１および図１２に示すように、ボックス本体２０の上部開口をカバー２１で閉じて両者を固定すると、カバー２１の下端外周に沿って延びる溝枠２２内に固着した環状のシール材２３がボックス本体２０の外壁２４の上端２５で押圧されて圧縮されることによりボックスが密封される。
【０００３】
【発明が解決しようとする課題】
上記従来のボックスの防水構造では、ボックス本体２０の外壁２４の上端２５でシール材２３の一部を押圧してボックスが密封されるので、外壁２４の公差によるバラツキにより、外壁２４の上端２５がシール材２３を圧縮する位置やその圧縮量にバラツキが生じ、シール材２３による防水効果が低くなることがある。また、幅の狭い外壁２４の上端２５でシール材２３を圧縮するので、シール面積、すなわち上端２５とシール材２３との接触面積が小さく、高い防水効果が得られない。
【０００４】
本発明は、このような事情に鑑みてなされたもので、その目的は、防水性の向上を図って高い防水効果が得られるボックスの防水構造を提供することである。
【０００５】
【課題を解決するための手段】
上記課題を解決するために、請求項１に係る発明は、ボックス本体の上部開口をカバーで閉じ、カバーとボックス本体の接合部に介在する環状のシール材によって密封するボックスの防水構造であって，カバーとボックス本体の接合部の一方に、環状のシール材の一面のほぼ全体を押圧する環状の突部を設け，環状のシール材を、環状の突部の中央平面部で圧縮される中央シール部と、環状の突部の内側傾斜面部で圧縮される内側傾斜シール部と、環状の突部の外側傾斜面部で圧縮される外側傾斜シール部と、環状の突部の内側のカバーとボックス本体の接合部に形成される内側平面部で圧縮される断面円形状の内側円形シール部と、環状の突部の外側のカバーとボックス本体の接合部に形成される外側平面部で圧縮される断面円形状の外側円形シール部とによって構成し，カバーとボックス本体の接合部に介在させたことを特徴とする。
かかる構成によれば、ボックス本体の上部開口をカバーで閉じると、カバーとボックス本体の接合部の一方に設けた環状の突部が、環状のシール材の一面のほぼ全体を押圧して圧縮するので、シール面積、すなわちシール材と環状の突部との接触面積が上記従来例よりも大幅に増加し、高い防水効果が得られる。
【０００６】
請求項２に係る発明は、カバーとボックス本体の接合部の他方を、環状の突部にほぼ合致する形状を有する環状の凹部としたことを特徴とする。
かかる構成によれば、ボックス本体の上部開口をカバーで閉じると、シール材の両面が、環状の突部と環状の凹部とによりそれぞれ押圧されるので、環状の突部と接触するシール材の一面側だけでなく、環状の凹部と接触するシール材の他面側でも大きなシール面積が得られ、その分だけ防水性が向上する。
【０００７】
請求項３に係る発明は、環状の突部は、シール材の一面の幅方向中央部を押圧する中央平面部と、該中央平面部の両端からそれぞれ傾斜して延びる内側および外側傾斜面部とを有することを特徴とする。
かかる構成によれば、環状の突部が、中央平面部と内側および外側傾斜面部の３箇所でシール材を押圧して圧縮するので、防水性がより一層向上する。また、シール材と環状の突部とが接触するシール部が迷路状に屈曲するので、水がより一層浸入しにくくなり、防水性がより一層向上する。
【０００８】
請求項４に係る発明は、環状の突部には、さらに、内側および外側傾斜面部からそれぞれ延びる内側および外側平面部が設けられていることを特徴とする。かかる構成によれば、環状の突部は上記３箇所に加えて内側および外側平面部でもシール材を押圧して圧縮するので、防水性がより一層向上する。
【０００９】
請求項５に係る発明は、カバーに、ボックス本体の周壁の少なくとも上端近傍の内面および外面を覆うように該周壁に嵌合する環状の溝を有する周壁を設け、環状の溝の上端とボックス本体の周壁の上端とがシール材を介して接合する前記接合部となっていることを特徴とする。
かかる構成によれば、ボックス本体の上部開口をカバーで閉じると、カバーの周壁の環状の溝がボックス本体の周壁の少なくとも上端近傍の内面および外面を覆うようにボックス本体の周壁に嵌合し、しかも両周壁の嵌合部の最も高い位置にある環状の溝の上端とボックス本体の周壁の上端との間でシール材が圧縮されるので、シール材によるシール部に水が浸入しにくく、防水性がより一層向上する。
【００１０】
請求項６に係る発明は、カバーの周壁は、ボックス本体の周壁の下端近傍まで延び、ボックス本体の周壁の内面および外面全体を覆うように該周壁に嵌合していることを特徴とする。
かかる構成によれば、カバーの周壁とボックス本体の周壁との嵌合長さが長くなり、その分だけ水が浸入しにくくなる。
【００１１】
【発明の実施の形態】
以下、本発明の実施の形態を図面に基づいて説明する。
【００１２】
図１は本発明の実施の形態の一例に係るボックスの防水構造を示す縦断面図、図２は図１の一部を拡大して示す部分断面図、図３は図１に示すボックスに用いるシール材の平面図、図４は図３のＡ−Ａ断面図である。
【００１３】
本例に係るボックスの防水構造にあっては、図１に示すように、ボックス１のボックス本体２の上部開口をボックス１のカバー３で閉じて該カバー３とボックス本体２を不図示の固定具で固定すると、ボックス本体２とカバー３の接合部に介在する環状のシール材４（図３参照）でボックス１が密封されるようになっている。
【００１４】
カバー３には、ボックス本体２の周壁５の上端近傍の内面および外面を覆うように該周壁５に嵌合する環状の溝６を有する周壁７が設けられている。該周壁７は外壁７ａと内壁７ｂからなり、該両壁７ａ，７ｂ間にできる環状の溝６の上端とボックス本体２の周壁５の上端とが環状のシール材４を介して接合する接合部となっている。また、ボックス本体２の周壁５の上端近傍の外面には、カバー３をボックス本体２に固定する際に外壁７ａの下端を係止してカバー３を位置決めするための環状のストッパ８が突設されている。
【００１５】
ボックス本体２の周壁５の上端（カバー２とボックス本体１の接合部の一方）には、環状のシール材４の下面（一面）のほぼ全体を押圧する環状の突部９が設けられている。該突部９は、図２に示すように、シール材４の下面の幅方向中央部を押圧する中央平面部９ａと、該中央平面部９ａの両端からそれぞれ傾斜して延びる内側傾斜面部９ｂおよび外側傾斜面部９ｃとを有する台形状に形成されている。この突部９には、さらに、内側傾斜面部９ｂおよび外側傾斜面部９ｃからそれぞれ延びる内側平面部９ｄおよび外側平面部９ｅとが設けられている。
【００１６】
カバー３の環状の溝６の上端（前記接合部の他方）を、環状の突部９にほぼ合致する形状を有する環状の凹部１０にしてある。すなわち、この凹部１０は、環状の突部９の中央平面部９ａ、内側傾斜面部９ｂおよび外側傾斜面部９ｃにそれぞれ対向する中央平面部１０ａ、および、内側傾斜面部１０ｂおよび外側傾斜面部１０ｃとからなる台形状の凹部と、環状の突部９の内側平面部９ｄおよび外側平面部９ｅにそれぞれ対向する内側平面部１０ｄおよび外側平面部１０ｅとを有する。
【００１７】
そして、カバー３の環状の凹部１０に図３および図４に示す環状のシール材４が固着されている。このシール材４は、ゴム、エラストマ、ゴムスポンジ等で作られている。また、シール材４は、突部９と凹部１０の各中央平面部９ａ，１０ａ間で圧縮される中央シール部４ａと、突部９と凹部１０の各内側傾斜面部９ｂ，１０ｂ間で圧縮される内側傾斜シール部４ｂと、突部９と凹部１０の各外側傾斜面部９ｃ，１０ｃ間で圧縮される外側傾斜シール部４ｃと、突部９と凹部１０の各内側平面部９ｄ，１０ｄ間で圧縮される断面が円形状の内側円形シール部４ｄと、突部９と凹部１０の各外側平面部９ｅ，１０ｅ間で圧縮される断面が円形状の外側円形シール部４ｅとからなる。また、中央シール部４ａは、内側および外側傾斜シール部４ｂ，４ｃより厚くかつほぼ均一な肉厚を有している。
【００１８】
上記構成を有する本例に係るボックスの防水構造では、カバー３の周壁７をボックス本体２の周壁５に嵌合させてボックス本体２の上部開口をカバー３で閉じ、該カバー３とボックス本体２を不図示の固定具で固定すると（図１参照）、周壁５の環状の突部９が周壁７の環状の凹部１０に固着した環状のシール材４の下面のほぼ全体を押圧して圧縮する（図２参照）。そのため、シール面積、すなわち環状のシール材４と環状の突部９との接触面積が図１１および図１２に示す上記従来例よりも大幅に増加する。
したがって、本例によれば、ボックス本体２の周壁５の公差によるバラツキにより、シール材４による防水効果が低くなることがなく、防水性の向上を図って高い防水効果を得ることができる。
【００１９】
また、カバー３の周壁７の環状の溝６の上端を、ボックス本体２の環状の突部９にほぼ合致する形状を有する環状の凹部１０とした構成により、ボックス本体２の上部開口をカバー３で閉じると、シール材４の両面が、環状の突部９と環状の凹部１０とにより図２の矢印で示す３箇所でそれぞれ押圧される。すなわち、シール材４の中央シール部４ａが突部９と凹部１０の各中央平面部９ａ，１０ａ間で圧縮され、内側傾斜シール部４ｂが突部９と凹部１０の各内側傾斜面部９ｂ、１０ｂ間で圧縮され、そして、外側傾斜シール部４ｃが突部９と凹部１０の各外側傾斜面部９ｃ，１０ｃ間で圧縮される。そのため、突部９と接触するシール材４の下面側だけでなく、凹部１０と接触するシール材４の上面側でも大きなシール面積が得られ、その分だけ防水性が向上する。しかも、シール材４と突部９とが接触するシール部、およびシール材４と凹部１０とが接触するシール部がそれぞれ迷路状に（台形状に）屈曲するので、水がより一層浸入しにくくなり、防水性がより一層向上する。
【００２０】
また、突部９は、上記３箇所に加えて内側および外側平面部９ｄ，９ｅでもシール材４の内側および外側円形シール部４ｄ，４ｅを凹部１０の内側および外側平面部１０ｄ，１０ｅとの間でそれぞれ押圧して圧縮するので、防水性がより一層向上する。
【００２１】
また、シール材４の中央シール部４ａが突部９と凹部１０の各中央平面部９ａ、１０ａ間で圧縮されることにより、中央シール部４ａの一部が内側および外側傾斜シール部４ｂ，４ｃ側、さらには内側および外側円形シール部４ｄ、４ｅ側に押し出される。そのため、内側および外側傾斜シール部４ｂ，４ｃと、内側および外側円形シール部４ｄ，４ｅとの各部での防水性が向上する。
【００２２】
また、ボックス本体２の上部開口をカバー３で閉じると、カバー３の周壁７の環状の溝６がボックス本体２の周壁５の上端近傍の内面および外面を覆うように周壁５に嵌合し、しかも両周壁５，７の嵌合部の最も高い位置にある環状の溝６の上端の凹部１０とボッ４クス本体７の周壁５の上端の突部９との間でシール材が圧縮されるので、シール材４によるシール部に水が浸入しにくく、防水性がより一層向上する。
【００２３】
図５は上記一例に係るボックスの防水構造の変形例を示している。この変形例では、カバー３の周壁７´は、ボックス本体２の周壁５の下端近傍まで延び、ボックス本体２の周壁５全体を覆うように該周壁５に嵌合している。その他の構成は上記一例と同じである。
この変形例によれば、カバー３の周壁７´とボックス本体２の周壁５との嵌合長さが長くなり、その分だけ水が浸入しにくくなる。すなわち、周壁７´の下端側から該周壁７´とボックス本体２の周壁５との間に水が入り込んでも、周壁７´の下端からシール材４のある位置までの高さが大きいために、水が両周壁５、７´の隙間を通ってシール材４に到達しにくくなっている。したがって、非常に高い防水効果が得られる。
【００２４】
なお、上記各例において、図３および図４に示す上記環状のシール材４に代えて、図６に示すような断面が矩形である環状のシール材１１を用いてもよい。このシール材１１を用いることにより、製造コストを低減することができる。
また、図１に示す上記一例および図５に示す上記変形例において、ボックス本体２側に環状の突部９を設けかつカバー３側に環状の凹部１０を設ける代わりに、図７に示すように、カバー３側に環状の突部９と同形状の環状の突部９Ａを設けかつボックス本体２側に環状の凹部１０と同形状の環状の凹部１０Ａを設けてもよい。この場合、図３および図４に示す環状のシール材４を図７および図８に示すように上下を逆にして用いる。
この変形例によっても、上記各例と同様の効果が得られる。
【００２５】
また、図１に示す上記一例および図５に示す上記変形例において、図９に示す変形例のように、ボックス本体２側に断面が半円形の環状の突部９Ｂを設けかつカバー３側に断面が半円形の環状の凹部１０Ｂを設けてもよい。環状の突部９Ｂには、前記環状の突部９と同様の内側および外側平面部９ｄ，９ｅが設けられている。また、図９に示す変形例では、図６に示す環状のシール材１１を用いている。
この変形例によれば、上記一例と同様に、ボックス本体２側に設けた環状の突部９Ｂがカバー３側に設けた環状の凹部１０Ｂとの間でシール材１１のほぼ全体を押圧して圧縮するので、ボックス本体２の周壁５の公差によるバラツキにより、シール材１１による防水効果が低くなることがなく、防水性の向上を図って高い防水効果を得ることができる。
【００２６】
また、図１に示す上記一例および図５に示す上記変形例において、図１０に示す変形例のように、ボックス本体２側に断面が半円形の環状の突部９Ｂを設けかつカバー３側に断面が断面が台形状の環状の凹部１０Ｃを設けてもよい。
この変形例によっても、上記一例と同様に、ボックス本体２側に設けた環状の突部９Ｂがカバー３側に設けた環状の凹部１０Ｃとの間でシール材１１のほぼ全体を押圧して圧縮するので、ボックス本体２の周壁５の公差によるバラツキにより、シール材１１による防水効果が低くなることがなく、防水性の向上を図って高い防水効果を得ることができる。
【００２７】
さらに、図１に示す上記一例において、カバー３の周壁７を無くし、カバー３の外周に、ボックス本体２の周壁５の上端に設けた環状の突部９と環状のシール材４を介して接合しかつ前記環状の凹部１０と同様の形状を有する環状の接合部を設け、そして、該接合部と環状の突部９とでシール材４を圧縮するように構成してもよい。この構成によっても、防水性の向上を図って高い防水効果を得ることができる。
【００２８】
【発明の効果】
以上説明したように、請求項１に係る発明によれば、防水性の向上を図って高い防水効果を得ることができる。
【００２９】
請求項２に係る発明によれば、請求項１に係る発明により得られる効果に加えて、環状の突部と接触するシール材の一面側だけでなく、環状の凹部と接触するシール材の他面側でも大きなシール面積が得られ、その分だけ防水性が向上する。
【００３０】
請求項３に係る発明によれば、請求項１又は２に係る発明により得られる効果に加えて、環状の突部が、中央平面部と内側および外側傾斜面部の３箇所でシール材を押圧して圧縮するので、防水性がより一層向上する。また、シール材と環状の突部とが接触するシール部が迷路状に屈曲するので、水がより一層浸入しにくくなり、防水性がより一層向上する。
【００３１】
請求項４に係る発明によれば、請求項３に係る発明により得られる効果に加えて、環状の突部は上記３箇所に加えて内側および外側平面部でもシール材を押圧して圧縮するので、防水性がより一層向上する。
【００３２】
請求項５に係る発明によれば、請求項１，２，３又は４に係る発明により得られる効果に加えて、カバーの周壁の環状の溝がボックス本体の周壁の少なくとも上端近傍の内面および外面を覆うようにボックス本体の周壁に嵌合し、しかも両周壁の嵌合の最も高い位置にある環状の溝の上端とボックス本体の周壁の上端との間でシール材が圧縮されるので、シール材によるシール部に水が浸入しにくく、防水性がより一層向上する。
【００３３】
請求項６に係る発明によれば、請求項５に係る発明により得られる効果に加えて、カバーの周壁とボックス本体の周壁との嵌合長さが長くなり、その分だけ水が浸入しにくくなる。
【図面の簡単な説明】
【図１】本発明の実施の形態の一例に係るボックスの防水構造を示す縦断面図。
【図２】図１の一部を拡大して示した部分断面図。
【図３】図１に示すボックスに用いるシール材の平面図。
【図４】図３のＡ−Ａ断面図。
【図５】図１に示す一例の変形例を示す縦断面図。
【図６】図４に示すシール材の変形例を示す同図と同様の断面図。
【図７】図１に示す一例の別の変形例を示す図で、図２と同様の部分断面図。
【図８】図７に示す変形例で用いるシール材を示す図で、図４と同様の断面図。
【図９】図１に示す一例の別の変形例を示す図で、図２と同様の部分断面図。
【図１０】図１に示す一例のさらに別の変形例を示す図で、図２と同様の部分断面図。
【図１１】従来のボックスの防水構造を示す分解斜視図。
【図１２】図１１に示す従来例におけるシール部の構造を示す部分断面図。
【符号の説明】
１……………………………………………ボックス
２……………………………………………ボックス本体
３……………………………………………カバー
４，１１……………………………………シール材
５……………………………………………ボックス本体の周壁
６……………………………………………環状の溝
７，７′……………………………………カバーの周壁
９，９Ａ，９Ｂ……………………………環状の突部
９ａ…………………………………………中央平面部
９ｂ…………………………………………内側傾斜面部
９ｃ…………………………………………外側傾斜面部
９ｄ…………………………………………内側平面部
９ｅ…………………………………………外側平面部
１０，１０Ａ，１０Ｂ，１０Ｃ…………環状の凹部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a waterproof structure of various boxes mounted on a vehicle such as an automobile, for example, a waterproof box provided in an engine room and containing an electrical connection box or the like.
[0002]
[Prior art]
As a conventional box waterproof structure, for example, one disclosed in Japanese Utility Model Publication No. 1-58983 is known. In this waterproof structure, as shown in FIGS. 11 and 12, when the upper opening of the box body 20 is closed by the cover 21 and both are fixed, the box 21 is fixed in the groove frame 22 extending along the outer periphery of the lower end of the cover 21. The box-shaped sealing material 23 is pressed and compressed by the upper end 25 of the outer wall 24 of the box body 20 to seal the box.
[0003]
[Problems to be solved by the invention]
In the above conventional box waterproof structure, the box is sealed by pressing a part of the sealing material 23 at the upper end 25 of the outer wall 24 of the box body 20, so that the upper end 25 of the outer wall 24 is caused by variations due to tolerance of the outer wall 24. The position where the sealing material 23 is compressed and the amount of compression vary, and the waterproofing effect of the sealing material 23 may be reduced. Moreover, since the sealing material 23 is compressed by the upper end 25 of the narrow outer wall 24, the sealing area, that is, the contact area between the upper end 25 and the sealing material 23 is small, and a high waterproof effect cannot be obtained.
[0004]
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a waterproof structure for a box that can improve waterproofness and obtain a high waterproof effect.
[0005]
[Means for Solving the Problems]
In order to solve the above problems, the invention according to claim 1, close a cover an upper opening of the box body, a waterproof box for sealing the annular sealing member interposed at the junction of the cover and the box body Then, an annular protrusion that presses almost the entire surface of the annular seal member is provided at one of the joints of the cover and the box body, and the annular seal member is compressed by the central flat portion of the annular protrusion. A central seal portion, an inner inclined seal portion that is compressed by the inner inclined surface portion of the annular protrusion, an outer inclined seal portion that is compressed by the outer inclined surface portion of the annular protrusion, and an inner cover of the annular protrusion. The inner circular seal portion having a circular cross section is compressed at the inner flat portion formed at the joint portion of the box body, and the outer flat portion formed at the joint portion between the outer cover of the annular protrusion and the box main body is compressed. Outside of circular cross section Constituted by a shape sealing portion, characterized in that interposed junction of the cover and the box body.
According to this configuration, when the upper opening of the box body is closed with the cover, the annular protrusion provided on one of the joints between the cover and the box body presses and compresses substantially the entire surface of the annular seal material. Therefore, the seal area, that is, the contact area between the seal material and the annular protrusion is significantly increased as compared with the conventional example, and a high waterproof effect is obtained.
[0006]
The invention according to claim 2 is characterized in that the other of the joint portion of the cover and the box body is an annular recess having a shape substantially matching the annular protrusion.
According to such a configuration, when the upper opening of the box body is closed with the cover, both surfaces of the sealing material are pressed by the annular protrusion and the annular recess, respectively, so that one surface of the sealing material in contact with the annular protrusion A large sealing area can be obtained not only on the side but also on the other side of the sealing material in contact with the annular recess, and the waterproofness is improved accordingly.
[0007]
According to a third aspect of the present invention, the annular protrusion includes a central flat surface portion that presses the central portion in the width direction of one surface of the sealing material, and inner and outer inclined surface portions that extend from the both ends of the central flat portion, respectively. It is characterized by having.
According to such a configuration, the annular protrusion presses and compresses the sealing material at the three locations of the central plane portion and the inner and outer inclined surface portions, so that the waterproofness is further improved. In addition, since the seal portion where the seal material and the annular protrusion come into contact is bent in a maze shape, water becomes more difficult to enter and the waterproofness is further improved.
[0008]
The invention according to claim 4 is characterized in that the annular protrusion is further provided with inner and outer plane portions respectively extending from the inner and outer inclined surface portions. According to such a configuration, the annular protrusions press and compress the sealing material at the inner and outer plane portions in addition to the above three locations, so that the waterproofness is further improved.
[0009]
In the invention according to claim 5, the cover is provided with a peripheral wall having an annular groove fitted to the peripheral wall so as to cover at least the inner surface and the outer surface in the vicinity of the upper end of the peripheral wall of the box body, and the upper end of the annular groove and the box body The upper end of the peripheral wall is the joining portion that joins via a sealing material.
According to such a configuration, when the upper opening of the box body is closed with the cover, the annular groove of the peripheral wall of the cover is fitted to the peripheral wall of the box body so as to cover at least the inner surface and the outer surface near the upper end of the peripheral wall of the box body, In addition, since the sealing material is compressed between the upper end of the annular groove at the highest position of the fitting portion of both peripheral walls and the upper end of the peripheral wall of the box body, water does not easily enter the sealing portion by the sealing material and is waterproof. The property is further improved.
[0010]
The invention according to claim 6 is characterized in that the peripheral wall of the cover extends to the vicinity of the lower end of the peripheral wall of the box main body, and is fitted to the peripheral wall so as to cover the entire inner surface and outer surface of the peripheral wall of the box main body.
According to such a configuration, the fitting length between the peripheral wall of the cover and the peripheral wall of the box body is increased, and water is less likely to enter.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0012]
1 is a longitudinal sectional view showing a waterproof structure of a box according to an example of an embodiment of the present invention, FIG. 2 is an enlarged partial sectional view showing a part of FIG. 1, and FIG. 3 is used for the box shown in FIG. FIG. 4 is a cross-sectional view taken along line AA of FIG. 3.
[0013]
In the waterproof structure of the box according to this example, as shown in FIG. 1, the upper opening of the box body 2 of the box 1 is closed by the cover 3 of the box 1 and the cover 3 and the box body 2 are fixed (not shown). When fixed with a tool, the box 1 is hermetically sealed with an annular sealing material 4 (see FIG. 3) interposed at the joint between the box body 2 and the cover 3.
[0014]
The cover 3 is provided with a peripheral wall 7 having an annular groove 6 fitted to the peripheral wall 5 so as to cover the inner surface and the outer surface near the upper end of the peripheral wall 5 of the box body 2. The peripheral wall 7 is composed of an outer wall 7a and an inner wall 7b, and the upper end of the annular groove 6 formed between the walls 7a and 7b and the upper end of the peripheral wall 5 of the box body 2 are joined via an annular sealing material 4. It has become. Further, an annular stopper 8 is provided on the outer surface near the upper end of the peripheral wall 5 of the box body 2 to lock the lower end of the outer wall 7a and position the cover 3 when the cover 3 is fixed to the box body 2. Has been.
[0015]
An annular protrusion 9 is provided on the upper end of the peripheral wall 5 of the box body 2 (one of the joints between the cover 2 and the box body 1) to press almost the entire lower surface (one surface) of the annular seal material 4. . As shown in FIG. 2, the protrusion 9 includes a central flat surface portion 9 a that presses the central portion in the width direction of the lower surface of the sealing material 4, an inner inclined surface portion 9 b that extends at an inclination from both ends of the central flat surface portion 9 a, and It is formed in the trapezoid shape which has the outer side inclined surface part 9c. The protrusion 9 is further provided with an inner flat surface portion 9d and an outer flat surface portion 9e extending from the inner inclined surface portion 9b and the outer inclined surface portion 9c, respectively.
[0016]
The upper end of the annular groove 6 of the cover 3 (the other of the joints) is an annular recess 10 having a shape substantially matching the annular protrusion 9. That is, the concave portion 10 includes a central flat surface portion 9a of the annular protrusion 9, a central flat surface portion 10a facing the inner inclined surface portion 9b and the outer inclined surface portion 9c, and an inner inclined surface portion 10b and an outer inclined surface portion 10c. It has a trapezoidal recess, and an inner flat surface portion 10d and an outer flat surface portion 10e that face the inner flat surface portion 9d and the outer flat surface portion 9e of the annular protrusion 9, respectively.
[0017]
The annular sealing material 4 shown in FIGS. 3 and 4 is fixed to the annular recess 10 of the cover 3. The sealing material 4 is made of rubber, elastomer, rubber sponge or the like. Further, the sealing material 4 is compressed between the central seal portion 4a compressed between the central flat portions 9a and 10a of the protrusion 9 and the concave portion 10, and between the inner inclined surface portions 9b and 10b of the convex portion 9 and the concave portion 10. The inner inclined seal portion 4b, the outer inclined seal portion 4c compressed between the outer inclined surface portions 9c and 10c of the protrusion 9 and the recess 10, and the inner flat portions 9d and 10d of the protrusion 9 and the recess 10 An inner circular seal portion 4d having a circular cross section to be compressed and an outer circular seal portion 4e having a circular cross section to be compressed between the outer flat portions 9e and 10e of the protrusion 9 and the recess 10 are formed. Further, the central seal portion 4a is thicker than the inner and outer inclined seal portions 4b and 4c and has a substantially uniform thickness.
[0018]
In the waterproof structure of the box according to this example having the above-described configuration, the peripheral wall 7 of the cover 3 is fitted to the peripheral wall 5 of the box body 2, and the upper opening of the box body 2 is closed by the cover 3. Is fixed with a fixing tool (not shown) (see FIG. 1), the annular protrusion 9 of the peripheral wall 5 presses and compresses almost the entire lower surface of the annular seal member 4 fixed to the annular recess 10 of the peripheral wall 7. (See FIG. 2). Therefore, the sealing area, that is, the contact area between the annular sealing material 4 and the annular protrusion 9 is significantly increased as compared with the conventional example shown in FIGS.
Therefore, according to this example, the waterproof effect by the sealing material 4 does not become low due to the variation due to the tolerance of the peripheral wall 5 of the box body 2, and a high waterproof effect can be obtained by improving the waterproof property.
[0019]
Further, the upper end of the box body 2 is formed as an annular recess 10 having a shape substantially matching the annular protrusion 9 of the box body 2 at the upper end of the annular groove 6 of the peripheral wall 7 of the cover 3. When both are closed, both surfaces of the sealing material 4 are pressed by the annular protrusion 9 and the annular recess 10 at three locations indicated by arrows in FIG. That is, the central seal portion 4a of the sealing material 4 is compressed between the central plane portions 9a and 10a of the protrusion 9 and the recess 10, and the inner inclined seal portion 4b is compressed to the inner inclined surface portions 9b and 10b of the protrusion 9 and the recess 10. The outer inclined seal portion 4 c is compressed between the outer inclined surface portions 9 c and 10 c of the protrusion 9 and the recess 10. Therefore, a large seal area can be obtained not only on the lower surface side of the sealing material 4 in contact with the protrusion 9 but also on the upper surface side of the sealing material 4 in contact with the recess 10, and the waterproofness is improved accordingly. In addition, since the seal portion where the seal material 4 and the protrusion 9 are in contact and the seal portion where the seal material 4 and the recess portion 10 are in contact are bent in a labyrinth shape (in a trapezoidal shape), water is more difficult to enter. Thus, waterproofness is further improved.
[0020]
Further, in addition to the above three locations, the protrusion 9 also has inner and outer flat portions 9d and 9e which are connected to the inner and outer circular seal portions 4d and 4e of the sealing material 4 between the inner and outer flat portions 10d and 10e of the recess 10. Since each is pressed and compressed, waterproofness is further improved.
[0021]
In addition, the central seal portion 4a of the sealing material 4 is compressed between the central flat portions 9a and 10a of the protrusion 9 and the concave portion 10, so that a part of the central seal portion 4a becomes the inner and outer inclined seal portions 4b and 4c. To the side, and further to the inner and outer circular seals 4d, 4e side. Therefore, the waterproofness at each of the inner and outer inclined seal portions 4b and 4c and the inner and outer circular seal portions 4d and 4e is improved.
[0022]
Further, when the upper opening of the box body 2 is closed by the cover 3, the annular groove 6 of the peripheral wall 7 of the cover 3 is fitted to the peripheral wall 5 so as to cover the inner surface and the outer surface near the upper end of the peripheral wall 5 of the box body 2, Moreover, the sealing material is compressed between the concave portion 10 at the upper end of the annular groove 6 at the highest position of the fitting portions of the peripheral walls 5, 7 and the protrusion 9 at the upper end of the peripheral wall 5 of the box 4 body 7. Therefore, it is difficult for water to enter the seal portion by the seal material 4, and the waterproofness is further improved.
[0023]
FIG. 5 shows a modification of the waterproof structure of the box according to the above example. In this modification, the peripheral wall 7 ′ of the cover 3 extends to the vicinity of the lower end of the peripheral wall 5 of the box body 2 and is fitted to the peripheral wall 5 so as to cover the entire peripheral wall 5 of the box body 2. Other configurations are the same as the above example.
According to this modification, the fitting length between the peripheral wall 7 ′ of the cover 3 and the peripheral wall 5 of the box body 2 is increased, and water is less likely to enter. That is, even if water enters between the peripheral wall 7 ′ and the peripheral wall 5 of the box body 2 from the lower end side of the peripheral wall 7 ′, the height from the lower end of the peripheral wall 7 ′ to the position where the sealing material 4 is present is large. It is difficult for water to reach the sealing material 4 through the gap between the peripheral walls 5 and 7 '. Therefore, a very high waterproof effect can be obtained.
[0024]
In each of the above examples, an annular sealing material 11 having a rectangular cross section as shown in FIG. 6 may be used instead of the annular sealing material 4 shown in FIGS. By using this sealing material 11, the manufacturing cost can be reduced.
Further, in the example shown in FIG. 1 and the modified example shown in FIG. 5, instead of providing the annular protrusion 9 on the box body 2 side and the annular recess 10 on the cover 3 side, as shown in FIG. Alternatively, an annular protrusion 9A having the same shape as the annular protrusion 9 may be provided on the cover 3 side, and an annular recess 10A having the same shape as the annular recess 10 may be provided on the box body 2 side. In this case, the annular sealing material 4 shown in FIGS. 3 and 4 is used upside down as shown in FIGS.
Also by this modification, the same effect as each said example is acquired.
[0025]
Further, in the example shown in FIG. 1 and the modification shown in FIG. 5, as in the modification shown in FIG. 9, an annular protrusion 9 </ b> B having a semicircular cross section is provided on the box body 2 side and on the cover 3 side. An annular recess 10B having a semicircular cross section may be provided. The annular protrusion 9B is provided with inner and outer plane portions 9d and 9e similar to the annular protrusion 9. In the modification shown in FIG. 9, the annular sealing material 11 shown in FIG. 6 is used.
According to this modification, as in the above example, the annular protrusion 9B provided on the box body 2 side presses almost the entire sealing material 11 between the annular recess 10B provided on the cover 3 side. Since the compression is performed, the waterproof effect of the sealing material 11 is not lowered due to the variation due to the tolerance of the peripheral wall 5 of the box body 2, and the waterproof effect can be improved and a high waterproof effect can be obtained.
[0026]
Further, in the example shown in FIG. 1 and the modification shown in FIG. 5, as in the modification shown in FIG. 10, an annular protrusion 9 </ b> B having a semicircular cross section is provided on the box body 2 side and on the cover 3 side. An annular recess 10C having a trapezoidal cross section may be provided.
Also in this modification, as in the above example, the annular protrusion 9B provided on the box body 2 side is compressed by pressing almost the entire sealing material 11 between the annular recess 10C provided on the cover 3 side. Therefore, the waterproof effect by the sealing material 11 does not become low due to the variation due to the tolerance of the peripheral wall 5 of the box body 2, and the high waterproof effect can be obtained by improving the waterproof property.
[0027]
Further, in the above example shown in FIG. 1, the peripheral wall 7 of the cover 3 is eliminated, and the outer periphery of the cover 3 is joined via an annular protrusion 9 provided at the upper end of the peripheral wall 5 of the box body 2 and an annular sealing material 4. In addition, an annular joint having the same shape as the annular recess 10 may be provided, and the sealing material 4 may be compressed by the joint and the annular protrusion 9. Also with this configuration, it is possible to improve waterproofness and obtain a high waterproof effect.
[0028]
【The invention's effect】
As described above, according to the first aspect of the invention, it is possible to improve waterproofness and obtain a high waterproof effect.
[0029]
According to the invention according to claim 2, in addition to the effect obtained by the invention according to claim 1, in addition to the one surface side of the seal material that contacts the annular protrusion, in addition to the seal material that contacts the annular recess. A large sealing area can be obtained even on the surface side, and the waterproofness is improved accordingly.
[0030]
According to the invention of claim 3, in addition to the effect obtained by the invention of claim 1 or 2, the annular protrusion presses the sealing material at the three locations of the central plane portion and the inner and outer inclined surface portions. The water resistance is further improved. In addition, since the seal portion where the seal material and the annular protrusion come into contact is bent in a maze shape, water becomes more difficult to enter and the waterproofness is further improved.
[0031]
According to the invention of claim 4, in addition to the effect obtained by the invention of claim 3, the annular protrusion presses and compresses the sealing material at the inner and outer plane parts in addition to the above three places. Further, the waterproofness is further improved.
[0032]
According to the invention according to claim 5, in addition to the effect obtained by the invention according to claim 1, 2, 3 or 4, the annular groove of the peripheral wall of the cover has at least an inner surface and an outer surface near the upper end of the peripheral wall of the box body. The sealing material is compressed between the upper end of the annular groove at the highest fitting position of both peripheral walls and the upper end of the peripheral wall of the box body. Water does not easily enter the seal portion made of the material, and the waterproofness is further improved.
[0033]
According to the invention of claim 6, in addition to the effect obtained by the invention of claim 5, the fitting length between the peripheral wall of the cover and the peripheral wall of the box body is increased, and water is less likely to enter. Become.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a waterproof structure of a box according to an example of an embodiment of the present invention.
FIG. 2 is a partial cross-sectional view showing an enlarged part of FIG.
3 is a plan view of a sealing material used for the box shown in FIG. 1. FIG.
4 is a cross-sectional view taken along line AA in FIG.
FIG. 5 is a longitudinal sectional view showing a modification of the example shown in FIG.
6 is a cross-sectional view similar to FIG. 4, showing a modification of the sealing material shown in FIG.
7 is a diagram showing another modification of the example shown in FIG. 1, and is a partial sectional view similar to FIG.
8 is a view showing a sealing material used in the modification shown in FIG. 7, and is a cross-sectional view similar to FIG.
9 is a view showing another modification of the example shown in FIG. 1, and is a partial sectional view similar to FIG.
10 is a view showing still another modification of the example shown in FIG. 1, and is a partial sectional view similar to FIG.
FIG. 11 is an exploded perspective view showing a waterproof structure of a conventional box.
12 is a partial cross-sectional view showing a structure of a seal portion in the conventional example shown in FIG.
[Explanation of symbols]
1 …………………………………………… Box 2 …………………………………………… Box body 3 ………………………… ………………… Cover 4, 11 …………………………………… Sealing material 5 …………………………………………… The peripheral wall 6 of the box body …………………………………………… Annular groove 7, 7 ′ …………………………………… Cover peripheral wall 9, 9A, 9B ………… ………………… Annular protrusion 9a ………………………………………… Center plane 9b ………………………………………… Inwardly inclined Surface portion 9c ………………………………………… Outer inclined surface portion 9d ………………………………………… Inner plane portion 9e …………………… …………………… Outer plane part 10, 10A, 10B, 10C …… ...... Annular recess

Claims

Close the upper opening of the box body with a cover, a waterproof structure of a box for sealing the annular sealing member interposed at the junction of the box body and the cover,
One of the joints of the cover and the box body is provided with an annular protrusion that presses substantially the entire surface of the annular sealing material ,
The annular seal material includes a central seal portion that is compressed by a central plane portion of the annular protrusion, an inner inclined seal portion that is compressed by an inner inclined surface portion of the annular protrusion, and the annular protrusion. An outer inclined seal portion that is compressed by an outer inclined surface portion, an inner circular seal portion having a circular cross section that is compressed by an inner flat portion formed at a joint portion of the cover and the box body inside the annular protrusion. And an outer circular seal portion having a circular cross section which is compressed by an outer flat portion formed at a joint portion of the box body, and the cover outside the annular protrusion,
A waterproof structure for a box, wherein the waterproof structure is interposed at a joint between the cover and the box body .

2. The waterproof structure for a box according to claim 1, wherein the other of the joint portion between the cover and the box body is an annular recess having a shape substantially matching the annular protrusion.

The annular protrusion includes a central flat surface portion that presses a central portion in the width direction of one surface of the sealing material, and inner and outer inclined surface portions that extend from the both ends of the central flat surface in an inclined manner. The waterproof structure of the box according to claim 1 or 2.

The waterproof structure for a box according to claim 3, wherein the annular protrusion is further provided with inner and outer flat portions extending from the inner and outer inclined surface portions, respectively.

The cover is provided with a peripheral wall having an annular groove fitted to the peripheral wall so as to cover at least an inner surface and an outer surface in the vicinity of the upper end of the peripheral wall of the box body, and an upper end of the annular groove and an upper end of the peripheral wall of the box body The waterproof structure for a box according to claim 1, 2, 3 or 4, wherein the joint portion is joined through the sealing material.

6. The box according to claim 5, wherein the peripheral wall of the cover extends to the vicinity of the lower end of the peripheral wall of the box body, and is fitted to the peripheral wall so as to cover the entire inner surface and outer surface of the peripheral wall of the box body. Waterproof structure.