JP4180248B2 - Electrical junction box - Google Patents

Electrical junction box Download PDF

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Publication number
JP4180248B2
JP4180248B2 JP2001121232A JP2001121232A JP4180248B2 JP 4180248 B2 JP4180248 B2 JP 4180248B2 JP 2001121232 A JP2001121232 A JP 2001121232A JP 2001121232 A JP2001121232 A JP 2001121232A JP 4180248 B2 JP4180248 B2 JP 4180248B2
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box body
wall
groove
peripheral
box
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JP2002058128A (en
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正弘 和田
美幸 清田
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Yazaki Corp
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Yazaki Corp
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    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00Constructional details common to different types of electric apparatus
    • H05K7/02Arrangements of circuit components or wiring on supporting structure
    • H05K7/026Multiple connections subassemblies
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K5/00Casings, cabinets or drawers for electric apparatus
    • H05K5/02Details
    • H05K5/0212Condensation eliminators
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K5/00Casings, cabinets or drawers for electric apparatus
    • H05K5/02Details
    • H05K5/0213Venting apertures; Constructional details thereof
    • H05K5/0214Venting apertures; Constructional details thereof with means preventing penetration of rain water or dust

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Casings For Electric Apparatus (AREA)
  • Cooling Or The Like Of Electrical Apparatus (AREA)
  • Connection Or Junction Boxes (AREA)

Description

【0001】
【発明の属する技術分野】
本発明は、自動車等の電気配線に使用される電気接続箱(ジヤンクション・ブロツク;以下J/Bともいう)に関し、特に、箱本体と防水カバーとの間に構成される防水・排熱構造に関する。
【0002】
【従来の技術】
従来から自動車等に搭載される電気部品を収容したヒューズボックスやジョイントボックス等の絶縁樹脂製の電気接続箱(J/B)には、その内部に収容される電気部品を水等から保護するために、種々の防水構造が形成されている。例えば、実開平4−111223号公報に開示されているものが知られている。
【0003】
図8に示すように従来の防水構造51は、電気接続箱の箱本体52とこの箱本体52に被嵌された防水カバー53との間の嵌合部に設けられている。すなわち、箱本体52の周囲には高さが低い外壁54とこの外壁54より高い内壁55が二重に形成されている。そして、これら外壁54と内壁55とで樋状の溝部56が形成され、該溝部56の溝底面57には適数の水抜き穴58が設けられている。
一方、外壁54の下方には箱スカート59が下方に垂設されていると共に、内壁55の下方にも短い内スカート60が下方に垂設されている。また、箱スカート59の上部外側にはバリヤ61が外方に張り出すように突設されている。
【0004】
また、前記防水カバー53の外周壁62の内周面は、内壁55の外周面に嵌合するように設けられている。また、カバースカート63が、前記外周壁62の下端部から外方に張り出すように連設されて垂下されている。そして、このカバースカート63の内周面は、前記外壁54の外周面に嵌合するように設けられている。なお、前記箱スカート59の内側下部には、外部に通じる図示されていない排出口が設けられている。
【0005】
即ち、前記箱本体52上にリレーボックス等の電気部品70が装着された後、防水カバー53が被嵌されると、カバースカート63と外壁54との間および内壁55と防水カバー53の外周壁62との間に微少の嵌合隙間が形成されるから、箱本体52および防水カバー53外部との間に多重壁64によるラビリンス構造が形成されることになる。
【0006】
この嵌合状態において、例えば図8における左斜め下方の外部から水滴が吹き付けられた場合には、先ずバリヤ61によって大部分の水滴の浸入が防止される。また、カバースカート63と外壁54との間の微少嵌合隙間は、水滴が溝部56内に浸入するのを防止する。
そして、溝部56内に浸入した水滴は溝底面57上に溜まり、水抜き穴58から箱スカート59の内側を伝わって外部へ排水される。さらに、内壁55と外周壁62との間の微少嵌合隙間は、水滴が溝部56から箱本体52と防水カバー53の内部空間65内に浸入するのを防止する。よって、外部から吹き付けられた水滴は電気部品70が装着された内部空間65へは浸入することはない。
【0007】
【発明が解決しようとする課題】
ところで、近年、自動車等に搭載される電装品の増加に伴い、ヒューズやリレー等の電気部品が増加して電気接続箱内の回路密度が高くなると共に、電気接続箱の省スペース化が望まれており、箱内の温度上昇値は高くなる傾向にある。
しかしながら、上述の如き防水構造51を備えた電気接続箱では、箱本体52と防水カバー53との間が微少嵌合隙間とされるので、ヒューズやリレー等の電気部品の発熱による箱内の熱を箱外に排熱することができない。
従って、本発明の目的は上記課題を解消することに係り、簡単な構造で箱内への水滴等の浸入と、箱内の温度上昇を抑制することができる安価な電気接続箱を提供することである。
【0008】
【課題を解決するための手段】
本発明の上記目的は、電気部品を収容する箱本体と、該箱本体の上方開口に被嵌される防水カバーとを備えた電気接続箱であって、
前記箱本体の周壁開口縁に対応する防水カバーの周壁端には、先端部から外周方向へ張り出すように連設されたフランジ部と、前記フランジ部の外周端から垂下されたスカート部が形成されると共に、
前記箱本体の周壁開口縁には、前記防水カバーの前記フランジ部に当接して前記防水カバーを支持する当接部と、該当接部の内周端から突設された、外側面が前記防水カバーの周壁内面と対向する内側壁と、該内側壁と平行するように前記当接部の中央に凹設された、前記周壁開口縁を一周する周溝とが設けられており、
前記周溝の溝内側壁及び溝外側壁には、該周溝に沿って互いに対向しないように貫通され、それぞれ箱本体内及び箱本体外に連通する連通口が形成されていることを特徴とする電気接続箱により達成される。
【0009】
上記構成によれば、箱本体の周壁開口縁に設けられた内側壁によって、防水カバーの周壁内面との間が微少隙間とされるので、外部からの水滴等の箱本体および防水カバーの内部空間への浸入を抑制できる。
又、箱本体内で生じた熱は、該箱本体の開口周端縁における周溝の溝内側壁及び溝外側壁にそれぞれ形成された連通口及び該周溝を介して箱体外に排熱されるので、箱本体内の温度上昇を抑制することができる。
【0010】
更に、これら連通口は、周溝に沿って互いに対向しないように該周溝の溝内側壁及び溝外側壁にそれぞれ貫通形成されている。そこで、溝外側壁の連通口近傍に外部から水滴等が吹き付けられた際も、水滴等は溝内側壁で一旦塞き止められるので、箱本体内に直接吹き込むことはなく、水滴等がこれら周溝及び溝内側壁の連通口を経て、箱本体内にまでは浸入し難い。
【0011】
尚、好ましくは前記溝外側壁に形成される連通口が、前記箱本体の周壁外面に凹設した導風溝の上部を前記周溝の底部に交差させて連通した貫通口から成る。
この場合、車両走行中の走行風等による強制冷却によって、箱本体内の更なる温度上昇の抑制が可能となる。
【0012】
【発明の実施の形態】
以下、添付図面に基づいて本発明の一実施形態に係る電気接続箱の防水・排熱構造を詳細に説明する。
図1は本発明の第1実施形態に係る防水・排熱構造を備えた電気接続箱の分解斜視図、図2は図1に示した電気接続箱のA部における要部拡大斜視図、図3は図2におけるIII-III 断面矢視図、図4は図2におけるIV-IV 断面矢視図である。
【0013】
本第1実施形態の絶縁樹脂製の電気接続箱1は、図1に示すように、ヒューズやリレーなどの電気部品Bが装着された機能部品装着部5を収容する略直方体状の箱本体2と、該箱本体2の上方開口に被嵌される防水カバー3と、該箱本体2の下を覆うロアカバー4とを備えている。
【0014】
前記防水カバー3は、機能部品装着部5を水滴や塵埃等から保護すると共に電気部品Bの点検や交換ができるように、箱本体2の上に脱着自在とされている。
前記ロアカバー4は、ワイヤーハーネス8を外部に引き出すハーネス導出部6と、中央部に向けて下り傾斜に形成された底壁の一番低い中央部に開設した排出口7とが形成され、箱本体2の下に脱着可能とされている。
【0015】
図2乃至図4にも示すように、本第1実施形態に係る防水・排熱構造10は、前記箱本体2の周壁開口縁と、該箱本体の周壁開口縁に対応する前記防水カバー3の周壁端との間に構成されている。
図3及び図4に示したように、前記箱本体2の上方開口に被嵌された際、該箱本体2の周壁開口縁に対応する防水カバー3の周壁端には、先端部から外周方向へ張り出すように連設されたフランジ部11の外周端から垂下されたスカート部12が全周にわたって形成される。
【0016】
前記箱本体2の周壁開口縁には、図2乃至図4に示したように、前記防水カバー3のフランジ部11に対応して支持当接する当接部16と、該当接部16より内側に突設されて外側面15aが前記防水カバー3の周壁内面3aと対向する内側壁15と、該内側壁15と平行に前記当接部16に凹設された断面矩形状の周溝17とが設けられている。
【0017】
更に、前記周溝17の溝内側壁17a及び溝外側壁17bには、該周溝17の延設方向に沿って互いに対向しないように貫通され、それぞれ箱本体2内及び箱本体2外に連通する連通口としての切欠き開口18,19が形成されている。
本第1実施形態におけるこれら切欠き開口18,19は、それぞれ前記箱本体2の周壁開口縁の複数個所(本実施形態においては4箇所)に対を成して適宜設けられており、該周壁開口縁の上端から下方に向かって切欠き形成されている。
【0018】
そして、本第1実施形態においては、先ず箱本体2内にヒューズやリレーなどの電気部品Bが装着された機能部品装着部5が収容された後、防水カバー3が被嵌されることで、該箱本体2の周壁開口縁に対応する前記防水カバー3の周壁端との間に必然的に防水・排熱構造10が構成される。
【0019】
即ち、前記防水カバー3が箱本体2の上方開口に被嵌されると、該防水カバー3のスカート部12が箱本体2の周壁開口縁外周に被さるので、外部からの水滴等の箱本体2および防水カバー3の内部空間への浸入を抑制できる。
更に、前記箱本体2の周壁開口縁に設けられた内側壁15が上方まで延びており、該内側壁15によって、防水カバー3の周壁内面3aと内側壁15の外面15aとの間が微少隙間とされることにより、仮に下方から水滴等が吹き付けられた場合にも、箱体2内及び防水カバー3内へ水滴等を浸入し難くできる。
【0020】
又、本第1実施形態の電気接続箱1における防水・排熱構造10によれば、ヒューズやリレー等の電気部品Bの発熱により箱本体2内で生じた熱は、該箱本体2の開口周端縁における周溝17の溝内側壁17a及び溝外側壁17bにそれぞれ形成された前記切欠き開口18,19及び該周溝17を介して箱体2外に排熱されるので、箱本体2内の温度上昇を抑制することができる。
【0021】
即ち、前記箱本体2の開口周端縁と防水カバー3の周壁端との当接部に、電気接続箱1の内外空間を連通する流路を形成することで、空気が箱本体2内外を容易に往き来することができる。
そこで、箱本体2内が高温になった際には、箱本体2内の空気が膨張し、前記切欠き開口18,19及び該周溝17を介して箱体2外に排出されると共に、一旦高温になった箱本体2内が冷えた際には、該箱本体2内の空気が収縮し、前記切欠き開口18,19及び該周溝17を介して箱体2外から外気が吸引されるので、箱本体2内の温度を効率良く下げることができる。
【0022】
又、電気接続箱1の内外空間を連通する上述の如き流路が箱本体2と防水カバー3との間に適宜設けられることで、箱本体2内は極端な負圧となり難く、箱本体2と防水カバー3との当接部の隙間やハーネス導出部6を挿通されたワイヤーハーネス8の線間から外部の空気と共に水等を吸い込むことはない。
【0023】
更に、これら切欠き開口18,19は、周溝17の延設方向に沿った所定の間隔をもって互いに対向しないように、該周溝17の溝内側壁17a及び溝外側壁17bにそれぞれ貫通形成されている。
そこで、前記溝外側壁17bの切欠き開口19近傍に水滴等が吹き付けられた際にも、水滴等が該切欠き開口19から直接、箱本体2内に浸入することはなく、図4中に矢印で示したように、前記溝内側壁17aで一旦塞き止められるので、水滴等が周溝17及び切欠き開口18を経て、箱本体2内にまでは達し難い。
【0024】
尚、仮に水滴等が前記切欠き開口18にまで達したとしても、図3中に矢印で示したように、切欠き開口18を通過した水は、箱本体2の内壁と機能部品装着部5との間から下のロアカバー4内に落下し、同ロアカバー4の排出口7から外部に排出される。
更に、前記機能部品装着部5に装着される電気部品Bから十分離れた位置に、前記切欠き開口18を形成すれば、電気接続箱1内の電気部品Bに水が更にかかり難くなり、水による電気部品Bの不具合が生じるのを防止できる。
【0025】
従って、本第1実施形態の電気接続箱1によれば、パッキン等を使用しなくても外部から吹き付けられた水滴等が、電気部品Bの収容された箱本体2内へ浸入するのを簡単な構造で抑制することができると共に、該箱本体2内で生じた熱を箱本体2外に排熱して温度上昇を抑制することができる。
そこで、箱本体2及び防水カバー3における密閉作業の簡素化に伴う作業効率及び信頼性の向上を図ることができると共に、電気接続箱1の耐久性と信頼性も向上することができる。
【0026】
図5は本発明の第2実施形態に係る防水・排熱構造を備えた電気接続箱の要部拡大斜視図、図6及び図7は図5におけるVI-VI 断面矢視図及びVII-VII 断面矢視図である。
本第2実施形態における電気接続箱の全体構成は、図1に示した上記第1実施形態の電気接続箱1と同様の構成であるので、同符号を付して詳細な説明を省略する。
【0027】
本第2実施形態に係る防水・排熱構造20は、図6及び図7に示したように、箱本体2の周壁開口縁と、該箱本体2の周壁開口縁に対応する防水カバー3の周壁端との間に構成されている。
前記箱本体2の周壁開口縁には、図5乃至図7に示したように、前記防水カバー3のフランジ部11に対応して支持当接する当接部16と、該当接部16より内側に突設されて外側面15aが前記防水カバー3の周壁内面3aと対向する内側壁15と、該内側壁15と平行に前記当接部16に凹設された断面矩形状の周溝17とが設けられている。
【0028】
更に、前記周溝17の溝内側壁17a及び溝外側壁17bには、該周溝17の延設方向に沿って互いに対向しないように貫通され、それぞれ箱本体2内及び箱本体2外に連通する連通口としての切欠き開口18及び貫通口29が形成されている。
本第2実施形態における前記貫通口29は、箱本体2の周壁の外面の数カ所に上下方向に沿って細長く凹設した導風溝29aの上部を前記周溝17の底部に交差させて連通した貫通口である。
【0029】
そして、本第2実施形態においても、先ず箱本体2内に図示しない機能部品装着部が収容された後、防水カバー3が被嵌されることで、該箱本体2の周壁開口縁に対応する前記防水カバー3の周壁端との間に必然的に防水・排熱構造20が構成される。
即ち、本第2実施形態の電気接続箱における防水・排熱構造20においても、上記第1実施形態の防水・排熱構造10と同様に、外部からの水滴等の箱本体2および防水カバー3の内部空間への浸入を抑制できる。
【0030】
更に、本第2実施形態の防水・排熱構造20によれば、ヒューズやリレー等の電気部品Bの発熱により箱本体2内で生じた熱は、該箱本体2の開口周端縁における周溝17の溝内側壁17a及び溝外側壁17bにそれぞれ形成された前記切欠き開口18及び貫通口29と該周溝17とを介して箱体2外に排熱されるので、箱本体2内の温度上昇を抑制することができる。
【0031】
更に、前記箱本体2の開口周端縁と防水カバー3の周壁端との当接部に、電気接続箱の内外空間を連通する流路を形成することで、空気が箱本体2内外を容易に往き来することができる。
そこで、例えば前記電気接続箱が車両のエンジンルームに取り付けられる場合には、車両走行中に生じる走行風が前記電気接続箱の周囲に回り込むので、この走行風が図中符号Wで示す冷却風として導風溝29aに導入され、該導風溝29aを流れて上部の貫通口29から前記周溝17に流入することができる。
従って、本第2実施形態の電気接続箱によれば、上記第1実施形態の電気接続箱1と同様の作用効果に加え、車両走行中の走行風による強制冷却によって箱本体2内の更なる温度上昇の抑制が可能となる。
【0032】
なお、本発明の電気接続箱の構成は、上述した各実施形態に限定されるものでなく、適宜な変更を行うことにより他の態様でも実施することができる。例えば、上記各実施形態における周溝の断面形状は矩形断面であったが、半円断面や台形断面のような形状であっても良い。また、連通口の形成位置や数、形状等も上記実施形態の構成に限定されるものではない。
【0033】
又、上記実施形態においては、略直方体状の箱本体2と、該箱本体2の上方開口に被嵌される防水カバー3と、該箱本体2の下を覆うロアカバー4とを備えた電気接続箱について説明したが、本発明の電気接続箱の構成はこれに限定されるものではない。例えば、電気部品を収容する箱本体が底板部の周縁から立ち上がる周側壁を有すると共に、防水カバーもまた塞ぎ板部の周縁から立ち上がる周側壁を有し、双方の周側壁先端部を嵌め合わせて閉じるようにしたものでも良い。
【0034】
【発明の効果】
以上説明したように本発明の電気接続箱によれば、箱本体の周壁開口縁に設けられた内側壁によって、防水カバーの周壁内面との間が微少隙間とされるので、外部からの水滴等の箱本体および防水カバーの内部空間への浸入を抑制できる。
又、箱本体内で生じた熱は、該箱本体の開口周端縁における周溝の溝内側壁及び溝外側壁にそれぞれ形成された連通口及び該周溝を介して箱体外に排熱されるので、箱本体内の温度上昇を抑制することができる。
【0035】
更に、これら連通口は、周溝に沿って互いに対向しないように該周溝の溝内側壁及び溝外側壁にそれぞれ貫通形成されている。そこで、溝外側壁の連通口近傍に外部から水滴等が吹き付けられた際も、水滴等は溝内側壁で一旦塞き止められるので、箱本体内に直接吹き込むことはなく、水滴等がこれら周溝及び溝内側壁の連通口を経て、箱本体内にまでは浸入し難い。
従って、簡単な構造で箱内への水滴等の浸入と、箱内の温度上昇を抑制することができる安価な電気接続箱を提供できる。
【図面の簡単な説明】
【図1】本発明の第1実施形態に係る防水・排熱構造を備えた電気接続箱の分解斜視図である。
【図2】図1に示した電気接続箱のA部における要部拡大斜視図である。
【図3】図2におけるIII-III 断面矢視図である。
【図4】図2におけるIV-IV 断面矢視図である。
【図5】本発明の第2実施形態に係る防水・排熱構造を備えた電気接続箱の要部分解斜視図である。
【図6】図5におけるVI-VI 断面矢視図である。
【図7】図5におけるVII-VII 断面矢視図である。
【図8】従来の防水構造を備えた電気接続箱の要部説明図である。
【符号の説明】
1 電気接続箱
2 箱本体
3 防水カバー
3a 周壁内面
4 ロアカバー
10 防水・排熱構造
11 フランジ部
12 スカート部
15 内側壁
15a 外側面
16 当接部
17 周溝
17a 溝内側壁
17b 溝外側壁
18 切欠き開口(連通口)
19 切欠き開口(連通口)
B 電気部品
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electrical junction box (junction block; hereinafter also referred to as J / B) used for electrical wiring of an automobile or the like, and in particular, a waterproof / exhaust heat structure configured between a box body and a waterproof cover. About.
[0002]
[Prior art]
Conventionally, in an electrical junction box (J / B) made of an insulating resin such as a fuse box or a joint box containing electrical components mounted on an automobile or the like, the electrical components accommodated therein are protected from water or the like. In addition, various waterproof structures are formed. For example, what is disclosed in Japanese Utility Model Laid-Open No. 4-111223 is known.
[0003]
As shown in FIG. 8, the conventional waterproof structure 51 is provided at a fitting portion between a box main body 52 of an electrical junction box and a waterproof cover 53 fitted on the box main body 52. That is, an outer wall 54 having a low height and an inner wall 55 higher than the outer wall 54 are formed around the box body 52 in a double manner. The outer wall 54 and the inner wall 55 form a bowl-shaped groove portion 56, and an appropriate number of drain holes 58 are provided on the groove bottom surface 57 of the groove portion 56.
On the other hand, a box skirt 59 is suspended below the outer wall 54, and a short inner skirt 60 is also suspended below the inner wall 55. Further, a barrier 61 projects from the upper outer side of the box skirt 59 so as to project outward.
[0004]
The inner peripheral surface of the outer peripheral wall 62 of the waterproof cover 53 is provided so as to be fitted to the outer peripheral surface of the inner wall 55. A cover skirt 63 is continuously provided and suspended so as to project outward from the lower end portion of the outer peripheral wall 62. The inner peripheral surface of the cover skirt 63 is provided so as to be fitted to the outer peripheral surface of the outer wall 54. A discharge port (not shown) that communicates with the outside is provided at the inner lower portion of the box skirt 59.
[0005]
That is, when an electrical component 70 such as a relay box is mounted on the box body 52 and the waterproof cover 53 is fitted, the outer wall of the cover skirt 63 and the outer wall 54 and between the inner wall 55 and the waterproof cover 53 are covered. Since a small fitting gap is formed between the outer wall 62 and the outer wall 62, a labyrinth structure is formed by the multiple walls 64 between the box body 52 and the outside of the waterproof cover 53.
[0006]
In this fitted state, for example, when water droplets are sprayed from the outside of the diagonally lower left in FIG. 8, first, most of the water droplets are prevented from entering by the barrier 61. Further, the minute fitting gap between the cover skirt 63 and the outer wall 54 prevents water droplets from entering the groove portion 56.
Then, the water droplets that have entered the groove portion 56 accumulate on the groove bottom surface 57 and are drained to the outside through the drain hole 58 along the inside of the box skirt 59. Further, the minute fitting gap between the inner wall 55 and the outer peripheral wall 62 prevents water droplets from entering the box body 52 and the inner space 65 of the waterproof cover 53 from the groove portion 56. Therefore, water droplets sprayed from the outside do not enter the internal space 65 in which the electrical component 70 is mounted.
[0007]
[Problems to be solved by the invention]
In recent years, with the increase in electrical components mounted on automobiles and the like, electrical components such as fuses and relays have increased, and the circuit density in the electrical junction box has increased, and space saving of the electrical junction box has been desired. The temperature rise in the box tends to increase.
However, in the electrical junction box provided with the waterproof structure 51 as described above, since the gap between the box body 52 and the waterproof cover 53 is a small fitting gap, the heat in the box due to the heat generated by electrical components such as fuses and relays. Cannot be exhausted outside the box.
Accordingly, an object of the present invention is to solve the above-described problems, and to provide an inexpensive electrical junction box that can suppress the intrusion of water droplets and the like into the box and the temperature rise in the box with a simple structure. It is.
[0008]
[Means for Solving the Problems]
The above object of the present invention is an electrical junction box comprising a box body that houses electrical components, and a waterproof cover that is fitted into the upper opening of the box body,
At the peripheral wall end of the waterproof cover corresponding to the peripheral wall opening edge of the box body, there are a flange portion that is continuously provided so as to protrude from the tip portion in the outer peripheral direction, and a skirt portion that is suspended from the outer peripheral end of the flange portion. As it is formed,
The circumferential wall opening edge of the box body, the abutting portion abuts on the flange portion of the waterproof cover for supporting said waterproof cover, projecting from the inner peripheral end of the abutting portion, the waterproof outer surface An inner side wall facing the inner surface of the peripheral wall of the cover, and a peripheral groove that is recessed in the center of the contact portion so as to be parallel to the inner side wall, and makes a round around the peripheral wall opening edge ;
The groove inner wall and the groove outer wall of the circumferential groove are formed so as to pass through the circumferential groove so as not to face each other and to form a communication port communicating with the inside of the box body and the outside of the box body, respectively. Achieved by an electrical junction box.
[0009]
According to the above configuration, since the inner wall provided at the peripheral wall opening edge of the box main body forms a minute gap between the inner surface of the peripheral wall of the waterproof cover, the internal space of the box main body and the waterproof cover such as water droplets from the outside Can be prevented from entering.
The heat generated in the box body is exhausted to the outside of the box body through the communication openings formed in the inner and outer walls of the circumferential groove at the peripheral edge of the opening of the box body and the circumferential groove. Therefore, the temperature rise in the box body can be suppressed.
[0010]
Further, these communication ports are formed through the inner wall and the outer wall of the circumferential groove so as not to face each other along the circumferential groove. Therefore, even when water droplets or the like are sprayed from the outside near the communication port on the outer wall of the groove, the water droplets are once blocked by the inner wall of the groove, so that they are not directly blown into the box body, and the water droplets or the like are not blown around these peripheral walls. It is difficult to enter the box body through the groove and the communication opening on the inner wall of the groove.
[0011]
Preferably, the communication port formed on the outer wall of the groove is a through-hole communicating with the upper part of the air guide groove formed in the outer surface of the peripheral wall of the box body intersecting the bottom of the peripheral groove.
In this case, it is possible to further suppress the temperature rise in the box body by forced cooling by traveling wind or the like while the vehicle is traveling.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a waterproof / heat exhaust structure for an electrical junction box according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is an exploded perspective view of an electrical junction box having a waterproof / heat exhaust structure according to a first embodiment of the present invention, and FIG. 2 is an enlarged perspective view of a main part of an A junction portion of the electrical junction box shown in FIG. 3 is a sectional view taken along the line III-III in FIG. 2, and FIG. 4 is a sectional view taken along the line IV-IV in FIG.
[0013]
As shown in FIG. 1, the electrical junction box 1 made of insulating resin according to the first embodiment has a substantially rectangular parallelepiped box body 2 that houses a functional component mounting portion 5 on which an electrical component B such as a fuse or a relay is mounted. And a waterproof cover 3 fitted in the upper opening of the box body 2 and a lower cover 4 covering the bottom of the box body 2.
[0014]
The waterproof cover 3 is detachable on the box body 2 so as to protect the functional component mounting portion 5 from water droplets, dust, and the like and to allow inspection and replacement of the electrical component B.
The lower cover 4 is formed with a harness lead-out portion 6 that pulls out the wire harness 8 to the outside, and a discharge port 7 that is opened at the lowest central portion of the bottom wall that is inclined downward toward the central portion. 2 is removable.
[0015]
As shown in FIGS. 2 to 4, the waterproof / heat exhaust structure 10 according to the first embodiment includes a peripheral wall opening edge of the box body 2 and the waterproof cover 3 corresponding to the peripheral wall opening edge of the box body. It is comprised between the peripheral wall ends.
As shown in FIGS. 3 and 4, when fitted in the upper opening of the box body 2, the peripheral wall end of the waterproof cover 3 corresponding to the peripheral wall opening edge of the box body 2 has an outer circumferential direction from the tip portion. A skirt portion 12 that hangs down from the outer peripheral end of the flange portion 11 that is continuously provided so as to overhang is formed over the entire circumference.
[0016]
As shown in FIGS. 2 to 4, the peripheral edge of the box body 2 has an abutment portion 16 that supports and abuts the flange portion 11 of the waterproof cover 3, and an inner side of the corresponding contact portion 16. An inner wall 15 that protrudes and has an outer surface 15 a facing the inner surface 3 a of the peripheral wall of the waterproof cover 3, and a peripheral groove 17 having a rectangular cross section that is recessed in the contact portion 16 in parallel with the inner wall 15. Is provided.
[0017]
Further, the inner wall 17a and the outer wall 17b of the circumferential groove 17 are penetrated so as not to face each other along the extending direction of the circumferential groove 17, and communicate with the inside of the box body 2 and the outside of the box body 2, respectively. Notched openings 18 and 19 are formed as communication ports.
The notch openings 18 and 19 in the first embodiment are appropriately provided in pairs at a plurality of locations (four locations in the present embodiment) on the peripheral wall opening edge of the box body 2. A notch is formed downward from the upper end of the opening edge.
[0018]
And in this 1st Embodiment, after the functional component mounting part 5 with which electrical components B, such as a fuse and a relay, were first accommodated in the box main body 2, the waterproof cover 3 is fitted, A waterproof / heat exhaust structure 10 is necessarily formed between the peripheral wall end of the waterproof cover 3 corresponding to the peripheral wall opening edge of the box body 2.
[0019]
That is, when the waterproof cover 3 is fitted into the upper opening of the box body 2, the skirt portion 12 of the waterproof cover 3 covers the outer periphery of the peripheral wall opening edge of the box body 2. Further, it is possible to suppress the penetration of the waterproof cover 3 into the internal space.
Further, an inner wall 15 provided at the peripheral wall opening edge of the box body 2 extends upward, and the inner wall 15 allows a slight gap between the inner surface 3a of the waterproof cover 3 and the outer surface 15a of the inner wall 15. Thus, even when water droplets or the like are sprayed from below, it is difficult for water droplets or the like to enter the box 2 and the waterproof cover 3.
[0020]
Further, according to the waterproof / heat exhaust structure 10 in the electrical junction box 1 of the first embodiment, the heat generated in the box body 2 due to the heat generated by the electrical component B such as a fuse or a relay is generated in the opening of the box body 2. Since heat is exhausted to the outside of the box body 2 through the cutout openings 18 and 19 formed in the groove inner side wall 17a and the groove outer side wall 17b of the circumferential groove 17 at the circumferential edge and the circumferential groove 17, respectively, the box body 2 The temperature rise inside can be suppressed.
[0021]
That is, a flow path that communicates the inner and outer spaces of the electrical connection box 1 is formed at the contact portion between the opening peripheral edge of the box body 2 and the peripheral wall end of the waterproof cover 3, so that air can flow inside and outside the box body 2. You can easily come and go.
Therefore, when the inside of the box body 2 becomes hot, the air in the box body 2 expands and is discharged out of the box body 2 through the notch openings 18 and 19 and the circumferential groove 17. Once the inside of the box body 2 that has become hot has cooled, the air in the box body 2 contracts, and outside air is sucked from outside the box body 2 through the notched openings 18 and 19 and the circumferential groove 17. Therefore, the temperature in the box body 2 can be lowered efficiently.
[0022]
In addition, since the flow path as described above that communicates the inner and outer spaces of the electrical connection box 1 is appropriately provided between the box body 2 and the waterproof cover 3, the box body 2 is unlikely to become extremely negative pressure. Water or the like is not sucked together with the external air from the gap between the contact portion between the waterproof cover 3 and the wire harness 8 inserted through the harness lead-out portion 6.
[0023]
Further, the notch openings 18 and 19 are formed through the groove inner wall 17a and the groove outer wall 17b of the circumferential groove 17 so as not to face each other with a predetermined interval along the extending direction of the circumferential groove 17, respectively. ing.
Therefore, even when water droplets or the like are sprayed in the vicinity of the notch opening 19 in the groove outer wall 17b, the water droplet or the like does not directly enter the box body 2 from the notch opening 19, as shown in FIG. As indicated by the arrow, the groove inner wall 17a is temporarily blocked, so that it is difficult for water droplets or the like to reach the inside of the box body 2 through the peripheral groove 17 and the notch opening 18.
[0024]
Even if a water droplet or the like reaches the notch opening 18, as shown by an arrow in FIG. 3, the water that has passed through the notch opening 18 remains on the inner wall of the box body 2 and the functional component mounting portion 5. Falls into the lower lower cover 4 and is discharged to the outside through the discharge port 7 of the lower cover 4.
Furthermore, if the notch opening 18 is formed at a position sufficiently away from the electrical component B to be mounted on the functional component mounting portion 5, it becomes difficult for water to splash on the electrical component B in the electrical connection box 1, It is possible to prevent the malfunction of the electrical component B due to the above.
[0025]
Therefore, according to the electrical connection box 1 of the first embodiment, it is easy for water droplets or the like sprayed from the outside to enter the box body 2 in which the electrical component B is accommodated without using packing or the like. In addition to being able to be suppressed with a simple structure, heat generated in the box body 2 can be exhausted to the outside of the box body 2 to suppress an increase in temperature.
Therefore, it is possible to improve the working efficiency and reliability associated with the simplification of the sealing work in the box body 2 and the waterproof cover 3, and also improve the durability and reliability of the electrical junction box 1.
[0026]
FIG. 5 is an enlarged perspective view of an essential part of an electrical junction box having a waterproof / heat exhaust structure according to a second embodiment of the present invention, and FIGS. 6 and 7 are sectional views taken along the line VI-VI and VII-VII in FIG. It is a cross-sectional arrow view.
Since the overall configuration of the electrical junction box in the second embodiment is the same as that of the electrical junction box 1 of the first embodiment shown in FIG. 1, the same reference numerals are given and detailed description thereof is omitted.
[0027]
As shown in FIGS. 6 and 7, the waterproof / exhaust heat structure 20 according to the second embodiment includes a peripheral wall opening edge of the box body 2 and a waterproof cover 3 corresponding to the peripheral wall opening edge of the box body 2. It is comprised between the peripheral wall ends.
As shown in FIGS. 5 to 7, the peripheral edge of the box body 2 has an abutment portion 16 that supports and abuts the flange portion 11 of the waterproof cover 3, and an inner side of the contact portion 16. An inner wall 15 that protrudes and has an outer surface 15 a facing the inner surface 3 a of the peripheral wall of the waterproof cover 3, and a peripheral groove 17 having a rectangular cross section that is recessed in the contact portion 16 in parallel with the inner wall 15. Is provided.
[0028]
Further, the inner wall 17a and the outer wall 17b of the circumferential groove 17 are penetrated so as not to face each other along the extending direction of the circumferential groove 17, and communicate with the inside of the box body 2 and the outside of the box body 2, respectively. A notch opening 18 and a through-hole 29 are formed as communication ports.
In the second embodiment, the through-hole 29 communicates with the upper part of the air guide groove 29a elongated in the vertical direction at several locations on the outer surface of the peripheral wall of the box body 2 so as to intersect the bottom of the peripheral groove 17. It is a through hole.
[0029]
Also in the second embodiment, first, after a functional component mounting portion (not shown) is accommodated in the box body 2, the waterproof cover 3 is fitted to correspond to the peripheral wall opening edge of the box body 2. A waterproof / heat exhaust structure 20 is inevitably formed between the end of the peripheral wall of the waterproof cover 3.
That is, also in the waterproof / exhaust heat structure 20 in the electrical junction box of the second embodiment, the box body 2 and the waterproof cover 3 such as water droplets from the outside are provided as in the waterproof / exhaust heat structure 10 of the first embodiment. Can be prevented from entering the interior space.
[0030]
Furthermore, according to the waterproof / exhaust heat structure 20 of the second embodiment, the heat generated in the box body 2 due to the heat generated by the electrical component B such as a fuse or a relay is generated at the periphery of the opening peripheral edge of the box body 2. Since heat is exhausted to the outside of the box body 2 through the notch opening 18 and the through-hole 29 formed in the groove inner side wall 17a and the groove outer side wall 17b of the groove 17 and the peripheral groove 17, respectively, Temperature rise can be suppressed.
[0031]
Further, by forming a flow path that communicates the inner and outer spaces of the electrical connection box at the contact portion between the opening peripheral edge of the box body 2 and the peripheral wall end of the waterproof cover 3, air can easily move inside and outside the box body 2. Can come and go.
Therefore, for example, when the electric junction box is attached to the engine room of the vehicle, the running wind generated during the running of the vehicle wraps around the electric junction box. The air is introduced into the air guide groove 29a, can flow through the air guide groove 29a, and can flow into the peripheral groove 17 from the upper through-hole 29.
Therefore, according to the electrical junction box of the second embodiment, in addition to the same effects as the electrical junction box 1 of the first embodiment, the inside of the box body 2 is further improved by forced cooling by the traveling wind during traveling of the vehicle. The temperature rise can be suppressed.
[0032]
In addition, the structure of the electrical junction box of this invention is not limited to each embodiment mentioned above, It can implement also in another aspect by making an appropriate change. For example, although the cross-sectional shape of the circumferential groove in each of the above embodiments is a rectangular cross-section, it may be a semicircular cross-section or a trapezoidal cross-section. Further, the formation position, the number, the shape, and the like of the communication port are not limited to the configuration of the above embodiment.
[0033]
Moreover, in the said embodiment, the electrical connection provided with the substantially rectangular parallelepiped box main body 2, the waterproof cover 3 fitted by the upper opening of this box main body 2, and the lower cover 4 which covers the bottom of this box main body 2 Although the box has been described, the configuration of the electrical junction box of the present invention is not limited to this. For example, the box body that houses the electrical component has a peripheral side wall that rises from the periphery of the bottom plate part, and the waterproof cover also has a peripheral side wall that rises from the periphery of the closing plate part, and closes both ends of the peripheral side walls together. It may be something like this.
[0034]
【The invention's effect】
As described above, according to the electrical junction box of the present invention, the inner wall provided on the peripheral wall opening edge of the box body forms a minute gap between the inner surface of the peripheral wall of the waterproof cover. Intrusion into the internal space of the box body and waterproof cover.
The heat generated in the box body is exhausted to the outside of the box body through the communication openings formed in the inner and outer walls of the circumferential groove at the peripheral edge of the opening of the box body and the circumferential groove. Therefore, the temperature rise in the box body can be suppressed.
[0035]
Further, these communication ports are formed through the inner wall and the outer wall of the circumferential groove so as not to face each other along the circumferential groove. Therefore, even when water droplets or the like are sprayed from the outside near the communication port on the outer wall of the groove, the water droplets are once blocked by the inner wall of the groove, so that they are not directly blown into the box body, and the water droplets or the like are not blown around these peripheral walls. It is difficult to enter the box body through the groove and the communication opening on the inner wall of the groove.
Therefore, it is possible to provide an inexpensive electrical junction box that can suppress the ingress of water droplets or the like into the box and the temperature rise in the box with a simple structure.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of an electrical junction box having a waterproof / exhaust heat structure according to a first embodiment of the present invention.
FIG. 2 is an enlarged perspective view of a main part in part A of the electrical junction box shown in FIG.
FIG. 3 is a cross-sectional view taken along the line III-III in FIG.
4 is a sectional view taken along the line IV-IV in FIG. 2;
FIG. 5 is an exploded perspective view of an essential part of an electrical junction box having a waterproof / heat exhaust structure according to a second embodiment of the present invention.
6 is a cross-sectional view taken along the line VI-VI in FIG. 5;
7 is a cross-sectional view taken along the line VII-VII in FIG. 5;
FIG. 8 is an explanatory diagram of a main part of an electrical junction box having a conventional waterproof structure.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Electrical junction box 2 Box body 3 Waterproof cover 3a Inner peripheral wall surface 4 Lower cover 10 Waterproof / heat exhaust structure 11 Flange part 12 Skirt part 15 Inner side wall 15a Outer side face 16 Contact part 17 Circumferential groove 17a Groove inner wall 17b Groove outer wall 18 Cutting Notched opening (communication opening)
19 Notch opening (communication opening)
B Electrical parts

Claims (2)

電気部品を収容する箱本体と、該箱本体の上方開口に被嵌される防水カバーとを備えた電気接続箱であって、
前記箱本体の周壁開口縁に対応する防水カバーの周壁端には、先端部から外周方向へ張り出すように連設されたフランジ部と、前記フランジ部の外周端から垂下されたスカート部が形成されると共に、
前記箱本体の周壁開口縁には、前記防水カバーの前記フランジ部に当接して前記防水カバーを支持する当接部と、該当接部の内周端から突設された、外側面が前記防水カバーの周壁内面と対向する内側壁と、該内側壁と平行するように前記当接部の中央に凹設された、前記周壁開口縁を一周する周溝とが設けられており、
前記周溝の溝内側壁及び溝外側壁には、該周溝に沿って互いに対向しないように貫通され、それぞれ箱本体内及び箱本体外に連通する連通口が形成されていることを特徴とする電気接続箱。
An electrical junction box comprising a box body that houses electrical components, and a waterproof cover that is fitted into the upper opening of the box body,
At the peripheral wall end of the waterproof cover corresponding to the peripheral wall opening edge of the box body, there are a flange portion that is continuously provided so as to protrude from the tip portion in the outer peripheral direction, and a skirt portion that is suspended from the outer peripheral end of the flange portion. As it is formed,
The circumferential wall opening edge of the box body, the abutting portion abuts on the flange portion of the waterproof cover for supporting said waterproof cover, projecting from the inner peripheral end of the abutting portion, the waterproof outer surface An inner side wall facing the inner surface of the peripheral wall of the cover, and a peripheral groove that is recessed in the center of the contact portion so as to be parallel to the inner side wall, and makes a round around the peripheral wall opening edge ;
The groove inner wall and the groove outer wall of the circumferential groove are formed so as to pass through the circumferential groove so as not to face each other and to form a communication port communicating with the inside of the box body and the outside of the box body, respectively. Electrical junction box.
前記溝外側壁に形成される連通口が、前記箱本体の周壁外面に凹設した導風溝の上部を前記周溝の底部に交差させて連通した貫通口から成ることを特徴とする請求項1に記載の電気接続箱。  The communication port formed in the outer wall of the groove comprises a through-hole that communicates with an upper portion of an air guide groove that is recessed in an outer surface of the peripheral wall of the box body intersecting a bottom portion of the peripheral groove. The electrical junction box according to 1.
JP2001121232A 2000-05-29 2001-04-19 Electrical junction box Expired - Fee Related JP4180248B2 (en)

Priority Applications (1)

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