JP2004055829A

JP2004055829A - Waterproof case with electronic components inside

Info

Publication number: JP2004055829A
Application number: JP2002211367A
Authority: JP
Inventors: Nobuhito Hiramatsu; 平松　伸仁; Masayuki Ozawa; 小澤　正之; Shinya Igarashi; 五十嵐　信弥; Chihiro Kobayashi; 小林　千尋; Tsutomu Kawasaki; 川崎　勉
Original assignee: Hitachi Ltd; Hitachi Car Engineering Co Ltd
Current assignee: Hitachi Ltd; Hitachi Astemo Ltd
Priority date: 2002-07-19
Filing date: 2002-07-19
Publication date: 2004-02-19

Abstract

【課題】従来用いていた金属パイプを排除することによって、発熱抵抗体式空気流量測定装置の一部品であるハウジングの製作作業を簡略化し、更に発熱抵抗体式空気流量測定装置の低価格化を図る。
【解決手段】ハウジング成形時に三方向のピンを挿入し、その内の一ヶ所の挿入穴を塞ぐことにより換気穴を成形することによって、ハウジング製作作業の簡略化を図る方法とする。従来用いていた金属パイプを排除できるため、ハウジング製作作業の簡略化、部品数低減となり、発熱抵抗体式空気流量測定装置の低価格化が図ることができる。また、コネクタ部と電子回路基板があるケース部とを通気する手段を備えた換気穴とすることができる。
【選択図】　　　図１An object of the present invention is to eliminate the use of a metal pipe which has been conventionally used, to simplify the operation of manufacturing a housing which is a part of a heating resistor type air flow measuring device, and to reduce the cost of the heating resistor type air flow measuring device.
A method of simplifying a housing manufacturing operation is provided by inserting a three-way pin at the time of molding a housing and forming a ventilation hole by closing one of the insertion holes. Since the metal pipe used conventionally can be eliminated, the housing manufacturing operation can be simplified, the number of parts can be reduced, and the price of the heating resistor type air flow measuring device can be reduced. Further, a ventilation hole provided with a means for ventilating the connector portion and the case portion having the electronic circuit board can be provided.
[Selection diagram] Fig. 1

Description

【０００１】
【発明に属する技術分野】
本発明は、例えば熱線等を用いて熱線から空気への放熱量を使い内燃機関の吸入空気流量を測定する発熱抵抗体式空気流量測定装置等の電子回路基板を内設する防水ケースに関する。
【０００２】
【従来の技術】
防水型ケースでは周囲温度が高温となった場合に、防水構造であるためにケース内部の空気の温度変化によりケース内圧が変化した場合に圧力の逃げ場が無くなり、ケース材が破壊する場合がある。このため、このような内圧の変化に対応するため、ケース材に換気穴を設ける事が一般的に行われる。
【０００３】
しかしながら、ケース材の外部に単に外気に晒してしまっては、防水の意味が無くなってしまうため、換気穴の一方は防水コネクタの内部に開口する必要がある。
【０００４】
特に、内燃機関のエンジンルームに用いられる電子部品は、エンジンルーム内の省スペース化及び部品の共用化に伴い、コネクタの挿入する方向も限定されてきておりコネクタの挿入方向を複雑に曲げる必要が有る。
【０００５】
こういった場合の換気穴の従来技術として、特開平８−３３８２７９号公報に記載の公知技術がある。本公知技術は、発熱抵抗体式空気流量測定装置での例を示しているが、コネクタの曲りに対応した換気穴を設けるため、コの字型の金属パイプをケース材内部に一体成形した構造である。
【０００６】
【発明が解決しようとする課題】
上記従来技術の問題点として、金属パイプ部材を一体成形するために生じるコストアップが上げられる。コストアップの原因としては、曲げを有する換気パイプ単体のコストアップ分と、この金属パイプを一体成形する際に生じる作業工数増加による作業費アップ分がある。
【０００７】
このため、市場要求である低コスト化に答えるためには、このコストアップ分を如何に低減するかが重要な課題となる。
【０００８】
本発明の目的は、内燃機関に用いられる空気流量を測定する発熱抵抗体式空気流量測定装置の一部品であるハウジングの製作作業が簡略化でき、更に発熱抵抗体式空気流量測定装置の低価格化が可能な防水型ケースを実現することである。
【０００９】
【課題を解決するための手段】
上記目的を達成するために、本発明では一次加工においてコネクタ内部とケース内部とを連通する穴及び上記連通穴に開通しケースの外部若しくは内部に開口する第三の穴を設けた形状の成形品を製作し、二次加工において第三の穴を塞ぐことにより、金属パイプを使用しなくても、従来の金属パイプを用いた時と同様の効果を持つ換気穴を形成する構造としている。
【００１０】
上記構造とすることで、従来用いていた金属パイプを排除することが可能となると共に、金属パイプを一体成形する際に生じる作業工数も排除することが可能となる為、部品工数低減及び作業効率の改善が可能となり、製品トータルとして低コスト化を図ることができる。
【００１１】
【発明の実施の形態】
発熱抵抗体式空気流量測定装置を用い、本発明の実施例を以下の図面に従い詳細に説明する。
【００１２】
図４は、本発明の一実施例を示す発熱抵抗体式空気流量測定装置の横断面図であり、図５は発熱抵抗体式空気流量計１４を空気流れ１６方向から見た時の側面図である。
【００１３】
図４、図５に示すように発熱抵抗体式空気流量計１４は発熱抵抗体１８が空気流れ１６に直接当たるように、吸気系構成部材であるボディ１５にネジ１１を介して固定されている。また、発熱抵抗体式空気流量計１４は、ケースを構成するハウジング２、カバー１２、副空気通路部材１３、金属製ベース１７等で構成されており、これらの構成部品を接着により組合せて一体形のモジュールとなる。
【００１４】
図２は、発熱抵抗体式空気流量計１４の構成部品であるハウジング２の正面図であり、図１は図２のＡ−Ａ断面図であり、図３は図１の上面図である。図１から図３に示すようにハウジング２は、電子回路基板８を内装保護するためのケース部７と、電子回路基板８と外部機器とを電気的に接続するためのコネクタターミナル４を有するコネクタ部３と、コネクタ部３の反対側に空気流量検出のための発熱抵抗体１８等を支持する支持部材９とを一体化したプラスチック成形品であり、コネクタ部３の開口面は、ケース部７に内装保護される電子回路基板８が設置される面に対して略平行に設けられている。
【００１５】
更に、ハウジング２には、コネクタ部３とケース部７の間に吸気系構成部品であるボディ１５に取り付け固定するためのネジ穴１０を設けている金属板５を、ケース部に内装保護される電子回路基板８が設置される面に対して、ネジ穴１０の開放面を略垂直に設け一体成形しているフランジ部６がある。
【００１６】
更に、ハウジング２には、ケース部７の内圧が温度上昇による上昇するのを防止するための換気穴１が設けられており、換気穴１の両開口面はケース部７の内部、コネクタ部３の内部に設けられていることで、換気穴１はケース部７とコネクタ部３とを連通する構造となっている。
【００１７】
更に、ケース部７内部に設けてある換気穴１の開口面は、ケース部７に内装保護される電子回路基板８が設置される面に対して、略平行であり、コネクタ部３に設けてある換気穴１の開口面はコネクタ開口面に対して略平行に設けていることで、換気穴１は、ケース部７内部に設けている換気穴１の開口穴１ａ、コネクタ部３内部に設けてある換気穴１の開口穴１ｂ、開口穴１ａ、１ｂに対して略垂直に開通する穴１ｃによって略直角に曲がった２つの曲りを有する構造になっている。
【００１８】
また、換気穴１の開通穴１ｃは、図６で説明する一次加工においてケース部７の内外を貫通する穴で成形されるが、二次加工においてケース部７の外部の開口面を塞ぐことで、換気穴１を形成している。
【００１９】
またケース部７に内装保護される電子回路基板８は、ゲルで覆われるのが一般的であり、ケース部７の内部に設けてある換気穴１の開口穴１ａは高さ有し、ケース部７の内部に設けている換気穴１の開口面がゲルに覆われない構造としている。
【００２０】
図６にて本実施例の換気穴１の一次加工（成形方法）について説明する。
図６に示すように、換気穴１は一次加工において、換気穴形成ピン１９、２０、２１を用いることで形成される。換気穴形成ピン２１に対して、換気穴形成ピン１９及び２０が同じ方向から略垂直に交わるように且つ、換気穴成形ピン１９と２０は略平行になるようにハウジング１５を成形する成形型設置され、換気穴形成ピン１９、２０、２１を上記構成に設置した後、樹脂を流し込み成形した後、換気穴形成ピン１９、２０、２１は、各々の開口面の方向且つ開口面に対して略垂直方向に抜かれることで、換気穴１の一次加工形状を有するハウジング２が形成せれる。
【００２１】
また、図６で示した換気穴形成ピン１９はコネクタ部３の内部に設けている換気穴１の開口穴１ｂに対応し、換気穴形成ピン２０はケース部７の内部に設けている換気穴１の開口穴１ａに対応し、換気穴形成ピン２１は換気穴１の開通穴１ｃに対応している。
【００２２】
図７にて本実施例の換気穴１の一次加工で成形した後の二次加工（封止方法）について説明する。図７は本発明の一実施例を示す図２のＡ−Ａ断面から見た図であり、一次加工後の形状及び二次加工後の形状を示した図である。
【００２３】
図７に示すように換気穴１の一次加工形状において、換気穴１の開通穴１ｃは、ケース部７の外部に開口する開口穴２２を有している。そこで二次加工において、ケース部材７の外部に開口している開口穴２２を、加熱した治具２３を用い開口穴２２付近の樹脂を溶かし、開口穴２２を塞ぐことで、換気穴１の開通穴１ｃは、換気穴の開口穴１ａ及び１ｃ間のみを開通する為、コネクタ部３の内部とケース部内部と連通する換気穴１が構成される。
【００２４】
換気穴１の一次加工形状を上記構造で形成することで、ハウジング２を形成する際の型構造に単純且つ簡単に盛込むことが出来るため、型構造を複雑にしなくてもコネクタ挿入方向を複雑に曲げたコネクタ曲りに対応した換気穴１を設けることが可能となると共に、型構造で対応できる為、従来使用していた換気パイプを排除することが可能となる。
【００２５】
よって、換気穴パイプ単体のコストアップ及び換気穴パイプを一体成形する際に生じる作業工数の増加も防ぐことが出来、コスト低減を図ることが可能となる。
【００２６】
特に、本実施例のように金属板の間に複雑な曲りを有する換気穴１を設ける形状においては、従来の換気パイプを用いると作業効率が非常に悪くなると共に、自動化が難しくなる為、どうしても作業費増加は避けられず、本実施例で示した型構造のみで成形できる換気穴１の一次加工形状は、とても有効なコスト低減方法となる。
【００２７】
ここで、換気穴１を構成するための二次加工作業費によるコストアップ分があるが、換気パイプを使用した時のコストアップ分と比較すると低く、製品トータルとして低コスト化を図ることが可能となる。
【００２８】
なお、開口穴２２の封止方法として本実施は、加熱した治具２３を使用し、樹脂を溶かす手法にて説明したが、樹脂を溶かす手法で塞ぐのならば、その手段は加熱した治具だけでなく高周波振動等を使用しても、樹脂を溶かして開口穴２２を塞ぐことが出来、同様の作用効果を得ることが可能となる。
【００２９】
次に、図８を用いて図７に示す開口穴２２を塞ぐその他の実施例について説明する。図８は本発明の一実施例を示す図２のＡ−Ａ断面から見た図であり、一次加工後の形状、及び二次加工後の形状を示した図である。
【００３０】
図８に示すように換気穴１の１次加工形状において、換気穴１の開通穴１ｃは、ケース部７の外部に開口する開口穴２２を有している。そこで２次加工において、ケース部材７の外部に開口している開口穴２２にピン２４を圧入し、開口穴２２を塞ぐことで、換気穴１の開通穴１ｃは、換気穴の開口穴１ａ及び１ｃ間のみを開通する為、コネクタ部３の内部とケース部内部と連通する換気穴１が構成される。
【００３１】
ここで、換気穴１を構成するための二次加工によるコストアップ分として、ピン２４単体のコスト及び二次加工作業費があるが、換気パイプ単体のコストよりも、ピン２４単体のコストの方が低く、また換気パイプを使用した時の一次加工作業費よりも、ピン２４を圧入した時の二次加工作業費の方が少ないため、換気パイプを使用した時のコストアップ分と比較すると小さく、製品トータルとして低コスト化を図ることが可能となると共に、ピン２４を使用し開口穴２２を塞ぐ構造となっているため、開口穴２２を封止するための体積を十分確保することが出来るため、よりよく開口穴２２を封止することが可能となる。
【００３２】
なお、開口穴２２の封止方法として本実施は、ピン２４を圧入する手法にて説明したが、ピン２４を使用し塞ぐのであるならば、その手段は圧入だけではなく、接着もしくは溶着等でも開口穴２２を塞ぐことが出来、同様の作用効果を得ることが可能となる。
【００３３】
次に、図９を用いて図７に示す開口穴２２を塞ぐその他の実施例について説明する。図９は本発明の一実施例を示す図２のＡ−Ａ断面から見た図であり、一次加工後の形状、二次加工の仕方及び二次加工後の形状を示した図である。
【００３４】
図９に示すように、換気穴１の一次加工形状において、換気穴１の開通穴１ｃは、ケース部７の外部に開口する開口穴２２を有している。そこで、二次加工において、ケース部材７の外部に開口している開口穴２２に二次成形にて溶かした樹脂２５で開口穴２２を塞ぎ、樹脂２５が硬化することで、コネクタ部３の内部とケース部７の内部とを連通する換気穴１が構成される。
【００３５】
ここで、換気穴１を構成するための二次加工によるコストアップ分があるが、換気パイプを使用した時のコストアップ分と比較すると低く、製品トータルとして低コスト化を図ることが可能となると共に、二次成形にて開口穴２２を塞ぐ構造となっているため、開口穴２２をより緻密に塞ぐことが出来るため、よりよく開口穴２２を封止することが可能となる。
【００３６】
次に、図１０を用いて図７に示す開口穴２２を塞ぐその他の実施例について説明する。図１０は本発明の一実施例を示す図２のＡ−Ａ断面から見た図であり、二次加工後の形状を示した図である。
【００３７】
図１０は、本実施例の図７で説明した開口穴２２の付近の樹脂を溶かし開口穴２２を塞いだ二次加工の後に、更に塞いだ開口穴２２の上部及びその周囲に接着剤を塗布し硬化させる構成となっている。塞いだ開口穴２２を更に接着剤で塞ぐことで樹脂を溶かすことと接着剤の二つにより二重封止が行える為、塞いだ部分のエア漏れや耐久性などに対し信頼性の高い封止を行うことが可能となる。
【００３８】
なお、本実施例では開口穴２２を塞ぐ二次加工は、図７で示した樹脂溶かしの手法にて説明したが、図８で示した樹脂製もしくは金属ピンを使用した手法、図９で説明した二次成形を使用した手法でも開口穴２２を二次加工で塞いだ後に接着剤を使用することで二重の封止ができ、同様の作用効果を得ることが可能となる。
【００３９】
次に、図１１を用いて本発明の一実施例であるハウジング２の形態について説明する。図１１に示ように、上記ハウジング２には、ケース部７の内圧が温度上昇による上昇するのを防止するための換気穴１が設けられており、換気穴１の両開口面はケース部７の内部、コネクタ部３の内部に設けられていることで、換気穴１はケース部７とコネクタ部３とを連通する構造となっている。
【００４０】
更に、ケース部７内部には、ケース部７に内装保護される電子回路基板８が設される面に対して略平行に換気穴１の開口面が設けられており、またコネクタ部３に設けてある換気穴１の開口面は、コネクタ開口面に対して略平行に設けていることで、換気穴１は、ケース部７に内装保護される電子回路基板８が設置される面に対して略平行に設けている換気穴１の開口穴１ａ、コネクタ部３内部に設けてある換気穴１の開口穴１ｂ、開口穴１ａ、１ｂに対して略垂直に開通する穴１ｃによって略直角に曲がった２つの曲りを有する構造になっている。
【００４１】
また、換気穴１の開通穴１ｃは、一次加工においてケース部に内装保護される電子回路基板８が設置される面に対して、略垂直内に穴が成形させるが、二次加工においてケース部７に内装保護される電子回路基板８が設置される面に対して略垂直内に開口している穴２２の開口面を塞ぐことで、換気穴１を形成している。
【００４２】
また、ケース部７に内装保護される電子回路基板８は、ゲルで覆われるのが一般的であり、ケース部７の内部に設けてある換気穴１の開口穴１ａは高さを有し、ケース部７の内部に設けている換気穴１の開口面がゲルに覆われない構造としている。
【００４３】
ここで、換気穴１の開通穴１ｃから開口している開口穴２２は、接着剤２６を塗布され硬化し開口穴２２を塞ぐことで、換気穴１の開通穴１ｃは、換気穴の開口穴１ａ及び１ｃ間のみを開通する為、コネクタ部３の内部とケース部内部と連通する換気穴１が構成される。
【００４４】
本構成においては、ケース部７の内部に換気穴１の開通穴１ｃから開口している開口穴２２が設けられている為に、開口穴２２を塞いだ後の気密性は特に重要とならず、開口穴２２を開口穴を塞ぐ部材を設けて塞ぐのは、換気穴１へゲルの浸入を防止するためである。
【００４５】
よって、本構成とすることで、開口穴２２の封止した後の信頼性（気密性）を考慮しなくても良いため、二次加工がし易くなり製品トータルとして低コスト化を図ることが可能となる。
【００４６】
【発明の効果】
本発明によれば、内燃機関に用いられる空気流量を測定する発熱抵抗体式空気流量測定装置の一部品であるハウジングの製作作業が簡略化でき、更に発熱抵抗体式空気流量測定装置の低価格化が可能になる。
【図面の簡単な説明】
【図１】本発明の第一の実施形態を示す実施例であり図２のＡ−Ａ断面図である。
【図２】本発明の第一の実施形態を示すハウジングの正面図である。
【図３】本発明の第一の実施形態を示すハウジングの上面図である。
【図４】本発明の第一の実施形態を示す発熱抵抗体式空気流量測定装置の横断面図である。
【図５】本発明の第一の実施形態を示す発熱抵抗体式空気流量計の側面図である。
【図６】本発明の第一の実施形態である換気穴の一次加工（成形方法）の実施例を示す図２のＡ−Ａ断面図に相当する断面図である。
【図７】本発明の第一の実施形態を示す換気穴の二次加工（開口穴封止方法）の実施例を示す図２のＡ−Ａ断面図に相当する断面図である。
【図８】本発明の第一の実施形態を示す換気穴の二次加工を示す第２の実施例であり図２のＡ−Ａ断面図に相当する断面図である。
【図９】本発明の第一の実施形態を示す換気穴の二次加工を示す第３の実施例であり図２のＡ−Ａ断面図に相当する断面図である。
【図１０】本発明の第一の実施形態を示す換気穴の二次加工を示す第４の実施例であり図２のＡ−Ａ断面図に相当する断面図である。
【図１１】本発明の第二の実施形態を示す実施例であり図２のＡ−Ａ断面図に相当する断面図である。
【符号の説明】
１…換気穴、１ａ…ケース部内に設けられている換気穴の開口穴、１ｂ…コネクタ内に設けられている換気穴の開口穴、１ｃ…換気穴の開口穴に開通する開通穴、２…ハウジング、３…コネクタ部、４…コネクタターミナル、５…金属板、６…フランジ部、７…ケース部、８…電子回路基板、９…支持部材、１０…ネジ穴、１１…ネジ、１２…カバー、１３…副空気通路部材、１４…発熱抵抗体式空気流量計、１５…ボディ、１６…空気流れ、１７…金属ベース、１８…発熱抵抗体、１９…換気穴成形ピン、２０…換気穴成形ピン、２１…換気穴成形ピン、２２…換気穴の開通穴から開口している開口穴、２３…冶具、２４…金属又は樹脂等のピン、２５…二次成形した樹脂、２６…接着剤[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a waterproof case in which an electronic circuit board such as a heating resistor type air flow measuring device for measuring an intake air flow rate of an internal combustion engine by using a heat radiation amount from a heat wire to air using a hot wire or the like is used.
[0002]
[Prior art]
In the case of a waterproof case, when the ambient temperature becomes high, because of the waterproof structure, if the internal pressure of the case changes due to a change in the temperature of the air inside the case, there is no place for the pressure to escape, and the case material may be broken. Therefore, in order to cope with such a change in the internal pressure, a ventilation hole is generally provided in the case material.
[0003]
However, simply exposing the outside of the case material to the outside air loses the meaning of waterproofing, so one of the ventilation holes needs to be opened inside the waterproof connector.
[0004]
In particular, with regard to electronic components used in the engine room of an internal combustion engine, the direction in which the connector is inserted has been limited due to the space saving in the engine room and the sharing of components, and it is necessary to flex the bending direction of the connector. Yes.
[0005]
As a conventional technique of the ventilation hole in such a case, there is a known technique described in JP-A-8-338279. This known technique shows an example of a heating resistor type air flow measuring device, but in order to provide a ventilation hole corresponding to the bending of the connector, a U-shaped metal pipe is integrally formed inside the case material. is there.
[0006]
[Problems to be solved by the invention]
As a problem of the above-mentioned prior art, a cost increase caused by integrally molding the metal pipe member is raised. The reasons for the increase in cost include an increase in the cost of the bent ventilation pipe alone and an increase in the work cost due to an increase in the number of work steps that occur when the metal pipe is integrally formed.
[0007]
For this reason, in order to respond to the market requirement of cost reduction, it is an important issue how to reduce the cost increase.
[0008]
An object of the present invention is to simplify the manufacturing operation of a housing, which is a part of a heating resistor type air flow measuring device for measuring an air flow rate used in an internal combustion engine, and to reduce the cost of the heating resistor type air flow measuring device. It is to realize a possible waterproof case.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, in the present invention, a molded product having a shape in which a hole communicating with the inside of the connector and the inside of the case and a third hole opened to the outside or inside of the case are provided in the communication hole in the primary processing. And by closing the third hole in the secondary processing, a ventilation hole having the same effect as using a conventional metal pipe is formed without using a metal pipe.
[0010]
By adopting the above structure, it is possible to eliminate the metal pipe which has been conventionally used, and it is also possible to eliminate the man-hour required for integrally forming the metal pipe, thereby reducing the number of parts and man-hour. And the cost can be reduced as a whole product.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiments of the present invention will be described in detail with reference to the following drawings using a heating resistor type air flow measuring device.
[0012]
FIG. 4 is a cross-sectional view of a heating resistor type air flow measuring device showing one embodiment of the present invention, and FIG. 5 is a side view when the heating resistor type air flow meter 14 is viewed from an air flow 16 direction. .
[0013]
As shown in FIGS. 4 and 5, the heating resistor type air flow meter 14 is fixed to a body 15 which is an intake system component via a screw 11 so that the heating resistor 18 directly hits the air flow 16. The heating resistor type air flow meter 14 is composed of a housing 2, a cover 12, a sub air passage member 13, a metal base 17 and the like constituting a case, and these components are combined by bonding to form an integral type. Become a module.
[0014]
2 is a front view of a housing 2 which is a component of the heating resistor type air flow meter 14, FIG. 1 is a sectional view taken along line AA of FIG. 2, and FIG. 3 is a top view of FIG. As shown in FIGS. 1 to 3, the housing 2 is a connector having a case portion 7 for protecting the interior of the electronic circuit board 8 and a connector terminal 4 for electrically connecting the electronic circuit board 8 to an external device. The connector 3 is a plastic molded product in which a support member 9 for supporting a heating resistor 18 and the like for detecting an air flow rate is integrated on the opposite side of the connector 3. It is provided substantially parallel to the surface on which the electronic circuit board 8 to be internally protected is installed.
[0015]
Further, a metal plate 5 provided with a screw hole 10 for attaching and fixing to a body 15 which is an intake system component between the connector portion 3 and the case portion 7 is protected inside the housing 2 by the case portion. There is a flange portion 6 provided with an open surface of the screw hole 10 substantially perpendicular to the surface on which the electronic circuit board 8 is installed and integrally formed.
[0016]
Further, the housing 2 is provided with a ventilation hole 1 for preventing the internal pressure of the case portion 7 from rising due to a temperature rise, and both opening surfaces of the ventilation hole 1 are inside the case portion 7 and the connector portion 3. , The ventilation hole 1 has a structure that allows the case portion 7 and the connector portion 3 to communicate with each other.
[0017]
Further, the opening surface of the ventilation hole 1 provided inside the case portion 7 is substantially parallel to the surface on which the electronic circuit board 8 to be internally protected in the case portion 7 is installed. Since the opening surface of a certain ventilation hole 1 is provided substantially parallel to the opening surface of the connector, the ventilation hole 1 is provided inside the opening portion 1 a of the ventilation hole 1 provided inside the case portion 7 and inside the connector portion 3. The ventilation hole 1 has a structure having two bends that are bent at substantially right angles by an opening 1b of the ventilation hole 1 and a hole 1c that opens substantially perpendicularly to the openings 1a and 1b.
[0018]
The opening 1c of the ventilation hole 1 is formed as a hole penetrating the inside and outside of the case portion 7 in the primary processing described with reference to FIG. 6, but is closed by closing the external opening surface of the case portion 7 in the secondary processing. , A ventilation hole 1 is formed.
[0019]
The electronic circuit board 8 which is internally protected by the case 7 is generally covered with a gel, and the opening 1a of the ventilation hole 1 provided inside the case 7 has a height. The structure is such that the opening surface of the ventilation hole 1 provided inside 7 is not covered with the gel.
[0020]
The primary processing (forming method) of the ventilation hole 1 of the present embodiment will be described with reference to FIG.
As shown in FIG. 6, the ventilation hole 1 is formed by using ventilation hole forming pins 19, 20, and 21 in the primary processing. A molding die installation for molding the housing 15 such that the ventilation hole forming pins 19 and 20 cross the ventilation hole forming pin 21 substantially perpendicularly from the same direction and the ventilation hole forming pins 19 and 20 are substantially parallel to each other. After the ventilation hole forming pins 19, 20, and 21 are installed in the above-described configuration, and the resin is poured and molded, the ventilation hole forming pins 19, 20, and 21 are substantially oriented in the direction of the respective opening surfaces and with respect to the opening surfaces. The housing 2 having the primary processing shape of the ventilation hole 1 is formed by being pulled out in the vertical direction.
[0021]
The ventilation hole forming pin 19 shown in FIG. 6 corresponds to the opening 1 b of the ventilation hole 1 provided inside the connector portion 3, and the ventilation hole forming pin 20 corresponds to the ventilation hole provided inside the case portion 7. The ventilation hole forming pin 21 corresponds to the opening hole 1 c of the ventilation hole 1.
[0022]
With reference to FIG. 7, a description will be given of the secondary processing (sealing method) after forming the ventilation hole 1 of the present embodiment by the primary processing. FIG. 7 is a diagram showing one embodiment of the present invention as viewed from the AA cross section of FIG. 2 and is a diagram showing a shape after primary processing and a shape after secondary processing.
[0023]
As shown in FIG. 7, in the primary processing shape of the ventilation hole 1, the opening 1 c of the ventilation hole 1 has an opening 22 that opens to the outside of the case 7. Then, in the secondary processing, the ventilation hole 1 is opened by melting the resin in the vicinity of the opening hole 22 using a heated jig 23 and closing the opening hole 22. Since the hole 1c opens only between the opening holes 1a and 1c of the ventilation hole, the ventilation hole 1 communicating with the inside of the connector portion 3 and the inside of the case portion is formed.
[0024]
By forming the primary processing shape of the ventilation hole 1 with the above structure, it is possible to simply and easily incorporate it into the mold structure when forming the housing 2, so that the connector insertion direction is complicated without complicating the mold structure. It is possible to provide the ventilation hole 1 corresponding to the bent connector and to use a mold structure, so that the ventilation pipe used conventionally can be eliminated.
[0025]
Therefore, it is possible to prevent an increase in the cost of the ventilation hole pipe alone and an increase in the number of man-hours required when integrally forming the ventilation hole pipe, and it is possible to reduce the cost.
[0026]
In particular, in the case where the ventilation hole 1 having a complicated bend is provided between the metal plates as in the present embodiment, the use of the conventional ventilation pipe greatly deteriorates the work efficiency and makes automation difficult, so that the work cost is inevitable. An increase cannot be avoided, and the primary processing shape of the ventilation hole 1 which can be formed only by the mold structure shown in this embodiment is a very effective cost reduction method.
[0027]
Here, there is a cost increase due to the secondary processing work cost for forming the ventilation hole 1, but it is lower than the cost increase when the ventilation pipe is used, and it is possible to reduce the cost as a whole product. It becomes.
[0028]
In this embodiment, the method of sealing the opening hole 22 is described by using the heated jig 23 and melting the resin. However, if the resin is closed by melting the resin, the means may be replaced by the heated jig. In addition to the use of high frequency vibration or the like, the opening 22 can be closed by melting the resin, and the same operation and effect can be obtained.
[0029]
Next, another embodiment for closing the opening 22 shown in FIG. 7 will be described with reference to FIG. FIG. 8 is a diagram showing one embodiment of the present invention, as viewed from the AA cross section in FIG. 2, and is a diagram showing a shape after primary processing and a shape after secondary processing.
[0030]
As shown in FIG. 8, in the primary processing shape of the ventilation hole 1, the opening 1 c of the ventilation hole 1 has an opening 22 that opens to the outside of the case 7. Then, in the secondary processing, the pin 24 is press-fitted into the opening hole 22 opened to the outside of the case member 7 and the opening hole 22 is closed, so that the opening hole 1c of the ventilation hole 1 becomes the opening hole 1a of the ventilation hole. In order to open only between 1c, the ventilation hole 1 which connects the inside of the connector part 3 and the inside of a case part is comprised.
[0031]
Here, as the cost increase due to the secondary processing for forming the ventilation hole 1, the cost of the pin 24 alone and the secondary processing operation cost are included, but the cost of the pin 24 alone is more than the cost of the ventilation pipe alone. Is low, and the secondary processing operation cost when the pin 24 is press-fitted is smaller than the primary processing operation cost when the ventilation pipe is used, so that it is smaller than the cost increase when the ventilation pipe is used. In addition, it is possible to reduce the cost of the product as a whole, and it is possible to secure a sufficient volume for sealing the opening hole 22 because the pin 24 is used to close the opening hole 22. Therefore, it is possible to better seal the opening hole 22.
[0032]
Although the present embodiment has been described as a method for sealing the opening hole 22 by press-fitting the pin 24, if the pin 24 is used for closing, the means is not limited to press-fitting, but may be adhesion or welding. The opening hole 22 can be closed, and the same function and effect can be obtained.
[0033]
Next, another embodiment for closing the opening 22 shown in FIG. 7 will be described with reference to FIG. FIG. 9 is a diagram showing one embodiment of the present invention as viewed from a cross section AA in FIG. 2, and is a diagram showing a shape after primary processing, a method of secondary processing, and a shape after secondary processing.
[0034]
As shown in FIG. 9, in the primary processing shape of the ventilation hole 1, the opening 1 c of the ventilation hole 1 has an opening 22 that opens to the outside of the case 7. Therefore, in the secondary processing, the opening hole 22 opened to the outside of the case member 7 is closed with the resin 25 melted by the secondary molding, and the resin 25 is cured, so that the inside of the connector portion 3 is hardened. The ventilation hole 1 which connects the inside of the case part 7 to the inside is formed.
[0035]
Here, there is an increase in cost due to the secondary processing for forming the ventilation hole 1, but it is lower than the increase in cost when a ventilation pipe is used, and it is possible to reduce the cost as a whole product. At the same time, since the opening hole 22 is closed by the secondary molding, the opening hole 22 can be more densely closed, so that the opening hole 22 can be better sealed.
[0036]
Next, another embodiment for closing the opening hole 22 shown in FIG. 7 will be described with reference to FIG. FIG. 10 is a diagram showing one embodiment of the present invention, as viewed from a cross section AA in FIG. 2, and is a diagram showing a shape after secondary processing.
[0037]
FIG. 10 shows that after the secondary processing of closing the opening hole 22 by melting the resin near the opening hole 22 described in FIG. 7 of the present embodiment, an adhesive is further applied to the upper portion of the closed opening hole 22 and its periphery. And hardened. The closed opening 22 is further sealed with an adhesive to melt the resin and the adhesive can be used to perform double sealing, so that the sealed portion has a highly reliable sealing against air leakage and durability. Can be performed.
[0038]
In the present embodiment, the secondary processing for closing the opening hole 22 has been described using the resin melting method shown in FIG. 7, but the method using a resin or metal pin shown in FIG. Even in the method using the secondary molding described above, double sealing can be performed by using the adhesive after closing the opening hole 22 by the secondary processing, and the same operation and effect can be obtained.
[0039]
Next, the form of the housing 2 according to one embodiment of the present invention will be described with reference to FIG. As shown in FIG. 11, the housing 2 is provided with a ventilation hole 1 for preventing the internal pressure of the case portion 7 from rising due to a rise in temperature. And the connector portion 3, the ventilation hole 1 has a structure that allows the case portion 7 and the connector portion 3 to communicate with each other.
[0040]
Further, an opening surface of the ventilation hole 1 is provided in the case portion 7 substantially in parallel with a surface on which the electronic circuit board 8 to be internally protected in the case portion 7 is provided, and provided in the connector portion 3. The opening surface of the ventilation hole 1 is provided substantially parallel to the opening surface of the connector. The opening 1a of the ventilation hole 1 provided substantially in parallel, the opening 1b of the ventilation hole 1 provided inside the connector portion 3, and the hole 1c which is opened substantially perpendicularly to the openings 1a, 1b are bent at substantially right angles. It has a structure having two bends.
[0041]
The opening 1c of the ventilation hole 1 is formed substantially in a vertical direction with respect to the surface on which the electronic circuit board 8 to be internally protected in the case is installed in the primary processing. The ventilation hole 1 is formed by closing the opening surface of the hole 22 that opens substantially perpendicularly to the surface on which the electronic circuit board 8 to be internally protected is installed.
[0042]
In general, the electronic circuit board 8 that is internally protected by the case 7 is covered with gel, and the opening 1a of the ventilation hole 1 provided inside the case 7 has a height. The structure is such that the opening surface of the ventilation hole 1 provided inside the case portion 7 is not covered with the gel.
[0043]
Here, the opening hole 22 opened from the opening hole 1c of the ventilation hole 1 is coated with an adhesive 26 and hardened to close the opening hole 22, so that the opening hole 1c of the ventilation hole 1 becomes the opening hole of the ventilation hole. Since only the space between 1a and 1c is opened, a ventilation hole 1 communicating with the inside of the connector section 3 and the inside of the case section is formed.
[0044]
In this configuration, since the opening 22 that opens from the through hole 1c of the ventilation hole 1 is provided inside the case portion 7, the airtightness after closing the opening 22 is not particularly important. The reason why the opening hole 22 is provided with a member for closing the opening hole is to prevent gel from entering the ventilation hole 1.
[0045]
Therefore, with this configuration, it is not necessary to consider the reliability (airtightness) after the opening hole 22 is sealed, so that the secondary processing is easy and the cost of the product as a whole can be reduced. It becomes possible.
[0046]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, the manufacturing operation | work of the housing which is one part of the heating resistor type air flow measuring device which measures the air flow used for an internal combustion engine can be simplified, and the price of the heating resistor type air flow measuring device can be reduced. Will be possible.
[Brief description of the drawings]
FIG. 1 is an example showing the first embodiment of the present invention, and is a cross-sectional view taken along the line AA of FIG.
FIG. 2 is a front view of a housing showing the first embodiment of the present invention.
FIG. 3 is a top view of the housing showing the first embodiment of the present invention.
FIG. 4 is a cross-sectional view of a heating resistor type air flow measuring device showing a first embodiment of the present invention.
FIG. 5 is a side view of a heating resistor type air flow meter showing the first embodiment of the present invention.
FIG. 6 is a cross-sectional view corresponding to an AA cross-sectional view of FIG. 2 showing an example of primary processing (forming method) of a ventilation hole according to the first embodiment of the present invention.
FIG. 7 is a cross-sectional view corresponding to an AA cross-sectional view of FIG. 2 illustrating an example of secondary processing (opening hole sealing method) of a ventilation hole according to the first embodiment of the present invention.
FIG. 8 is a cross-sectional view corresponding to a cross-sectional view taken along the line AA of FIG. 2, showing a second embodiment of the second embodiment of the present invention showing secondary processing of a ventilation hole.
FIG. 9 is a cross-sectional view corresponding to a cross-sectional view taken along line AA of FIG. 2, illustrating a third example of the secondary working of the ventilation hole according to the first embodiment of the present invention.
FIG. 10 is a cross-sectional view corresponding to a cross-sectional view taken along the line AA of FIG. 2, illustrating a fourth example of the secondary working of the ventilation hole according to the first embodiment of the present invention.
FIG. 11 is a cross-sectional view corresponding to an A-A cross-sectional view of FIG. 2, which is an example showing the second embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... ventilation hole, 1a ... ventilation hole provided in a case part, 1b ... ventilation hole provided in a connector, 1c ... ventilation hole opening hole, 2 ... Housing 3, connector part 4, connector terminal 5, metal plate 6, flange part 7, case part 8, electronic circuit board 9, support member 10, screw hole 11, screw 12, cover , 13: Sub air passage member, 14: Heating resistor type air flow meter, 15: Body, 16: Air flow, 17: Metal base, 18: Heating resistor, 19: Ventilation hole forming pin, 20: Ventilation hole forming pin , 21: Ventilation hole forming pin, 22: Opening hole opened from the opening of the ventilation hole, 23: Jig, 24: Pin of metal or resin, 25: Secondary molded resin, 26: Adhesive

Claims

In a waterproof case made of a resin material for installing an electronic circuit board inside, provided with a waterproof type connector for an electric signal interface with the outside,
The case has a hole communicating between the inside and the outside, and further has a hole through which the inside of the connector and the communication hole are opened, and further, by closing a hole opened to the outside of the case material, A waterproof case in which an electronic component is installed, wherein holes provided in the case material and the connector communicate with each other.

2. The electronic component according to claim 1, wherein a hole that opens into the inside of the case and the inside of the connector opens substantially parallel to a surface of the electronic circuit board on which the electronic component is installed. The waterproof case inside.

In a waterproof case made of a resin material for installing an electronic circuit board inside, equipped with a waterproof type connector for an electric signal interface with the outside,
The case has a hole having at least two or more bends communicating the inside of the connector and the inside of the case for installing the electronic circuit board, and is provided inside the case for installing electronic components of the electronic circuit. The hole is opened substantially parallel to the surface of the electronic circuit board on which the electronic components are installed, and further, inside the case where the electronic components of the electronic circuit board are installed, the electronic components of the electronic circuit board are provided. A third hole that opens substantially perpendicularly to the surface on which it is installed and that opens to a hole that communicates between the inside of the case material and the connector is provided, and by closing the third hole, A waterproof case in which an electronic component is provided, wherein the inside of the case where the electronic component of the electronic circuit board is installed communicates with the hole provided in the connector.

The waterproof case according to claim 1 or 3, wherein the resin of the case material is melted by heat, high-frequency vibration, or the like, and the opening is closed.

4. The waterproof case according to claim 1, wherein the electronic component is provided inside the electronic device, wherein the opening is closed by curing the adhesive.

4. The waterproof case as set forth in claim 1, wherein the electronic component is provided therein, wherein the opening is closed by performing secondary molding with resin.

4. The waterproof case according to claim 1, wherein an electronic component characterized by closing a hole that is opened by any one of a method such as press fitting, adhesion, and welding of a pin made of metal or resin into the opening. Waterproof case.

In the waterproof case according to any one of claims 4, 6 and 7, it is possible to reinforce the closed portion by applying and curing an adhesive on a portion that has closed the open hole. Waterproof case with electronic components inside.

It is used in internal combustion engines, generates heat by flowing a heating current, is used in a heating resistor type air flow measurement device that measures the air flow based on the amount of heat released to the intake air, and internally has a drive electronic circuit board inside, Further, in a waterproof case having a waterproof type connector for interfacing an external electrical signal with an engine control unit or the like,
The insertion direction of the connector is substantially parallel to the surface of the electronic circuit board on which the electronic components are installed, and the ventilation hole having at least two bends through which the inside of the connector communicates with the inside of the case where the electronic circuit board is installed. Further, a third opening hole is provided between an opening surface inside the connector of the ventilation hole and an opening surface inside the case where the electronic circuit board is installed, and the third opening hole is provided. A waterproof case of a heating resistor type air flow measuring device, wherein when closed, only the opening in the connector and the opening in the case where the electronic circuit board is installed communicate with the ventilation hole.

In a waterproof case made of a resin material for installing an electronic circuit board inside, provided with a waterproof type connector for an electric signal interface with the outside,
The case has a hole communicating between the inside and the outside, further has a hole through which the inside of the connector and the communication hole are opened, and a member that closes a hole that is open to the outside of the case material is provided. A waterproof case in which an electronic component is installed, wherein holes provided in the case material and the connector communicate with each other.

A method for manufacturing a waterproof case comprising a resin material for installing an electronic circuit board inside, comprising a waterproof type connector for an electric signal interface with the outside,
Forming a hole communicating the inside and outside of the case,
Forming a hole through the connector and the communication hole,
A method of manufacturing a waterproof case in which electronic components are internally provided, wherein a hole opened on the outside of the case material is closed, and holes provided in the case material and the connector are communicated.