JP2004135396A - Electric connection box - Google Patents

Electric connection box Download PDF

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Publication number
JP2004135396A
JP2004135396A JP2002295346A JP2002295346A JP2004135396A JP 2004135396 A JP2004135396 A JP 2004135396A JP 2002295346 A JP2002295346 A JP 2002295346A JP 2002295346 A JP2002295346 A JP 2002295346A JP 2004135396 A JP2004135396 A JP 2004135396A
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JP
Japan
Prior art keywords
bus bar
relay
terminal
board
substrate
Prior art date
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Granted
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JP2002295346A
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Japanese (ja)
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JP3876813B2 (en
Inventor
Shinji Kawakita
川北 伸二
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Sumitomo Wiring Systems Ltd
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Sumitomo Wiring Systems Ltd
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Priority to JP2002295346A priority Critical patent/JP3876813B2/en
Publication of JP2004135396A publication Critical patent/JP2004135396A/en
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  • Cooling Or The Like Of Electrical Apparatus (AREA)
  • Connection Or Junction Boxes (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric connection box which is small in size and low in heating. <P>SOLUTION: A circuit body 23 where a printed circuit 16 is provided on one surface 11a of a substrate 11 while bus bars 12-14 are provided on the other surface 11b is provided inside a case 20. A metal heat-radiation fin 21 is so jointed to the other surface side of the circuit body 23 as to abut to the bus bars 12-14. The heat-radiation fin 21 is exposed from the case 20. An electric component (a relay 22, etc.) is disposed with a gap on the printed circuit 16 side of the circuit body 23, with a hook-up bus bar 15 connected to its terminal 22a. An end 15b of the hook-up bus bar 15 is connected to connection parts 13b and 14a of the bus bars 13 and 14 protruding from the end edge of the substrate 11. Thus, the electric component (relay 15, etc.) is electrically connected to the bus bars 13 and 14. <P>COPYRIGHT: (C)2004,JPO

Description

【0001】
【発明の属する技術分野】
本発明は電気接続箱に関し、詳しくは、自動車に搭載される電気接続箱を小型・低発熱化するものである。
【0002】
【従来の技術】
従来、自動車用のジャンクションボックス等の電気接続箱1は、図7に示すように、アッパーケース2とロアケース6の内部に絶縁板4とバスバー5を積層した回路体3を収容しており、アッパーケース2の上面に多数のリレー搭載部2a、ヒューズ搭載部2b、コネクタ収容部2cを設けている。
【0003】
【特許文献1】
特開平5−15036号公報
【0004】
【発明が解決しようとする課題】
近時、自動車の高機能化に伴って電装品が急増していると共に車両の電気回路システムが多くなり、リレー等の電気部品の搭載個数が多くなる等、電気接続箱は大型化が余儀なくされている一方、車体の小型化と室内空間の確保を実現するため電気接続箱等の搭載スペースは減少するという相反する問題が生じている。また、電気接続箱をできるだけ小型化するために、電気接続箱に搭載されるリレー等の電気部品の密集度は高くなっており、それにより発熱量は大きくなるので何らかの放熱対策が必要となっている。
【0005】
本発明は上記問題に鑑みてなされたもので、電気接続箱を小型化すると共に過熱防止を図ることを課題としている。
【0006】
【課題を解決するための手段】
上記課題を解決するため、本発明は、基板の一面にプリント回路を設けると共に他面にバスバーを設けている回路体をケース内部に備え、該回路体の他面側に金属製の放熱用フィンを配置し、該放熱用フィンの一面を上記バスバーと密着させると共に他面を外部に露出させる一方、上記回路体のプリント回路側に隙間をあけて電気部品を配置し、該電気部品の端子を回路体と反対方向に突出させると共に該端子を中継バスバーの一端と接続し、該中継バスバーの他端を上記基板に固定している上記バスバーの端部と接続していることを特徴とする電気接続箱を提供している。
【0007】
上記電気部品はバスバーと半田付け或いは溶接で接続する基板リレーからなる。 なお、基板リレーに限定されず、バスバーと接続させる必要がある電気部品、電子部品等の場合も適用できる。
【0008】
上記構成とすると、回路体は基板の一面にプリント回路を設けて他面にバスバーを設けているので、従来のバスバーと絶縁板を積層配置した回路構成とするよりも小型・薄型化を図ることができる。
さらに、回路体のバスバーには、外部へ露出する放熱用フィンを当接させているためバスバーの発熱を放熱用フィンを介して外部へ効果的に放熱でき、回路体の過熱防止、更には電気接続箱内部の過熱防止を図ることができる。
【0009】
上記バスバーと接続する必要がある基板リレー等からなる電気部品は、バスバーを放熱用フィンと密着させて設置しているため、バスバー配置側に配置できず、プリント回路側に配置する必要がある。プリント回路側に配置して電気部品の端子を上記回路体の基板を通してバスバー側に突出させると、該端子とバスバーとを直接に半田付け或いは溶接で接続することができる。
しかしながら、端子の先端をバスバーを貫通させた状態で半田接続しなければならないため、端子がバスバーと放熱用フィンとの間に突出して放熱用フィンとバスバーとの密着度が低下し、放熱効果が薄れてしまうこととなる。
そのため、本発明では、上記電気部品の端子を回路体と反対側に向けて突出するように逆向きに配置する一方、回路体の基板に固定するバスバーと、該バスバーと接続させると共に上記電気部品の端子と半田接続する中継バスバーとを設け、言わばバスバーを分割して構成している。この中継バスバーを介して上記基板固定のバスバーと電気部品を接続しているため、電気部品の端子がバスバーを貫通して放熱用フィンとバスバーとの当接を阻害すること防止でき、放熱性能を安定確保することができる。
【0010】
具体的には、上記回路体の基板の他面に固定するバスバーは基板の端縁より突出させ、該バスバーの突出端に上記中継バスバーの他端を溶接すると共に、上記中継バスバーの一端は上記回路体および上記基板リレーの本体部を越えてリレー端子と対向する位置へと屈曲させて延在させ、その先端を上記基板リレーの端子と半田付けで接続している。
【0011】
上記基板の他面側にダミーバスバーを設け、該ダミーバスバーの端部は上記基板の端縁より突出させ、該突出部を基板の一面側へと屈曲させ、該屈曲端部を上記電気部品の本体部の樹脂面と当接させて該電気部品を安定保持する構成とすることが好ましい。
【0012】
即ち、上記電子部品はその端子を中継バスバーと接続しているだけであるため、車両振動等により端子と中継バスバーとの半田接続部に集中的に負荷が加わってしまう恐れがある。その場合、上記のように、上記ダミーバスバーを電子部品の本体部の樹脂面に当接させることで、振動による負荷をダミーバスバーにより吸収することができ、上記端子とバスバーの接続部分にクラックが発生することを防止できる。
また、金属製のダミーバスバーを発熱部品である電子部品に当接させることで、ダミーバスバーを介して上記放熱用フィンへと放熱することも可能となる。
【0013】
上記回路体は、その基板の一面側に半導体スイッチング素子(FET)を実装し、上記基板に穿設された貫通穴を通して上記バスバーに導通させる構成としていることが好ましい。
即ち、リレーの一部を小型の半導体スイッチング素子で代替し、該半導体スイッチング素子をプリント基板上に実装し、プリント基板の裏面側のバスバーと基板の貫通穴を通して接続することにより、高密度に回路を形成することができると共に重量も減少できる。
但し、リレーを全て上記半導体スイッチング素子に代為すると非常にコスト高になると共に、スペースの点から回路体に搭載できない場合もあり、よって、上記した基板リレーを用いて上記中継バスバーを介して回路体のバスバーと接続している。
【0014】
【発明の実施の形態】
本発明の実施形態を図面を参照して説明する。
図1乃至図3は第1実施形態を示す。
図1は自動車用の電気接続箱10を示し、アウターケース20と、該アウターケース20に組み付けられるインナーケース18と、該インナーケースの一側に配置される直線状バスバー19と、該インナーケース18の他側に配置される回路体23と、アウターケース20の側面を閉鎖する放熱用フィン21とを備えている。
【0015】
回路体23は、図1乃至図3に示すように、基板11の一面11aにプリント回路16を設けている一方、他面11bに所要形状のバスバー12〜14を固着しており、一面11aに実装する半導体スイッチング素子(FET)17等の電子部品の端子17aを基板11の貫通穴(図示せず)を通してバスバー12〜14と導通している。また、基板11の上方より突出するバスバー12、13の上端を段状に上方に屈折させて端子部12a、13aを設けている共に、所要のバスバー13、14の下端を段状に下方に屈折させて接続部13b、14aとしている。
【0016】
また、基板11のプリント回路16側には隙間をあけて基板型のリレー22を配置し、その端子22aが回路体23と反対方向を向けている。この端子22aは中継バスバー15の屈折した上端部15aと半田H付けしている。該中継バスバー15はリレー22の本体部22bおよび回路体23を越えるように屈曲させ、屈曲させた先端側の下端部15bをバスバー13、14の接続部13b、14aに半田H付けして接続している。
なお、上記リレー22の端子22aと中継端子15の上端部15aとの接続、および、中継端子15の下端部15bとバスバー13、14の接続部13b、14aとの接続は、半田接続の代わりに溶接で接続してもよい。また、リレーの本体部22bと基板11との隙間にFETを配置してもよい。
【0017】
アウターケース20は、側面開口20dと上面開口20cとを備えると共に、下面には外部回路であるワイヤハーネスW/Hの端末のコネクタCを嵌合接続するためのコネクタ収容部20aを有し、対向する側壁にインナーケース18のガイド溝20bを備えている。
直線状バスバー19は、上端を屈曲させて端子部19aとする一方、下端を雄端子部19bとしている。
【0018】
インナーケース18は、上壁部18aと仕切壁部18bとを備えた断面略T字状で、上壁部18aには、ヒューズ収容部18cやヒュージブルリンク収容部18dを備えている。
放熱用フィン21は、金属板の一側に短冊状の放熱用フィン21aを多数並設している。
【0019】
上記電気接続箱10の組み付けは、直線状バスバー19の雄端子部19bをアウターケース20のコネクタ収容部20a内に突出させるように収容し、インナーケース18の仕切壁部18bをガイド溝20bにスライド嵌合して上壁部18aでアウターケース20の上面開口20cを閉鎖すると共に、端子部19aをヒューズ収容部18cあるいはヒュージブルリンク収容部18d内の入力側に突出させる。
また、インナーケース18の仕切壁部18bを隔てて回路体23を収容すると共に、バスバー12〜14の端子部12a〜14aをヒューズ収容部18cあるいはヒュージブルリンク収容部18d内の出力側に突出させる。そして、放熱用フィン21でアウターケース20の側面開口20dを閉鎖する共に、放熱用フィン21を回路体23のバスバー12〜14と当接させている。
【0020】
上記構成とすると、回路体23は、基板11の一面11aにプリント回路16を設けて他面11bにバスバー12〜14を配策しているので、従来のバスバーと絶縁板の積層回路よりも小型・薄型化することができる。
しかも、リレー機能として、基板型のリレー22を残しながらも、一部を小型の半導体スイッチング素子(FET)17で代替しているので、高密度に回路を形成することができると共に重量も減少できる。
かつ、回路体23のバスバー12〜14には外部へ露出する放熱用フィン21を当接させているので、バスバー12〜14の発熱を放熱用フィン21を介して外部へ効果的に放熱して、回路体23の過熱防止を図ることができる。
【0021】
また、リレー22を回路接続する際に、基板11の他面11b側には放熱用フィン21が設置されているので、一面11a側に配置することとなるが、図4に示す比較例のように、リレー22の端子22aを基板11を貫通してバスバー12〜14に直接接続するとすれば、端子22aの先端をバスバー12〜143を貫通させた状態で半田H付けしなければならないため、端子22aがバスバー12〜14と放熱用フィン21との間に突出し、放熱用フィン21とバスバー12〜14との密着度が低下し、放熱効果が薄れることとなる。
しかしながら、本発明では、中継バスバー15を介して基板11の下方でバスバー13、14と半田H接続しているので、放熱用フィン21とバスバー12〜14との当接を阻害することが無く、放熱性能を安定確保することができる。
【0022】
さらには、リレー22の端子22aは基板11のある側と反対方向に向けているので、中継バスバー15およびリレー22の端子22aがプリント回路16と離反して回路干渉を確実に防止できる。
【0023】
図5(A)(B)は第2実施形態を示す。
第1実施形態との相違点は、基板11の他面11b側にバスバー12〜14と共に、リレー保持用のダミーバスバー30を設けている点である。
【0024】
ダミーバスバー30は、基板11の他面11bに接着していると共に、上端を基板11の上端縁より突出させて段状に上方に屈曲させることにより、上端を基板11の一面11aの方まで突出させて当接部30aとしている。
そして、図5(B)に示すように、ダミーバスバー30の当接部30aをリレー22の本体部22aの樹脂面と当接させて保持している。
【0025】
上記構成とすると、端子22aを中継バスバー15の上端部15aと半田H接続しているだけのリレー22を、ダミーバスバー30で本体部22bを当接保持することができるので、振動による負荷をダミーバスバー30により吸収することができ、半田H付け部分でのクラック発生などを防止することができる。
さらに、ダミーバスバー30をリレー22の本体部22bに当接させることで、リレー本体部22bの発熱をダミーバスバー30を介して放熱用フィン21へと伝熱させて放熱され、回路の過熱防止を補助することができる。
なお、ダミーバスバーは基板11を貫通させて一側11aへと突出させてもよい。また、他の構成は第1実施形態と同様であるため説明を省略する。
【0026】
また、ダミーバスバーの変形例として、図6(A)(B)に示すように、上端を基板11の上端縁より突出させてコの字状に屈曲させて、基板11の一面11a側の方まで突出させて当接部31aとしても好適である。
【0027】
【発明の効果】
以上の説明より明らかなように、本発明によれば、基板の一面にプリント回路を設けて他面にバスバーを設けた回路体を用いているので電気接続箱の小型・薄型化されると共に、回路体のバスバーには外部へ露出する上記放熱用フィンを当接させているので、上記バスバーの発熱を放熱用フィンを介して外部へ放熱して、回路体の過熱防止を図ることができる。
また、上記回路体のバスバーとリレーの端子を半田接続する際に、リレーの端子を回路体と逆向きに突出させ、該端子を回路体のバスバーと接続した中継バスバーと半田接続しているため、リレーの端子が上記放熱用フィン側に突出せず、バスバーと放熱用フィンとの当接を阻害せず、放熱性能を安定確保することができる。
【0028】
さらに、回路体より突設するダミーバスバーを電子部品の本体部の樹脂面に当接させることで、端子がバスバーの接続されているだけの電気部品を安定支持することができる。よって、車両振動による負荷をダミーバスバーにより吸収することができ、電子部品と中継バスバーとの接続部分のクラック発生などを防止できると共に、電気部品の発熱をダミーバスバーを介して上記放熱用フィンへと伝熱され、放熱効果を向上させることができる。
【図面の簡単な説明】
【図1】本発明の第1実施形態の電気接続箱の分解斜視図である。
【図2】リレー(電気部品)の接続形態を示す斜視図である。
【図3】リレー(電気部品)の接続形態を示す断面図である。
【図4】比較例を示す断面図である。
【図5】(A)は第2実施形態のリレー(電気部品)の接続形態を示す斜視図、(B)は断面図である。
【図6】(A)は変形例のリレー(電気部品)の接続形態を示す斜視図、(B)は断面図である。
【図7】従来例を示す斜視図である。
【符号の説明】
10    電気接続箱
11    基板
12〜14 バスバー
15    中継バスバー
16    プリント回路
17    FET
18    インナーケース
19    直線状バスバー
20    アウターケース
21    放熱用フィン
22    リレー(電気部品)
23    回路体
30、31 ダミーバスバー
C     コネクタ
H     半田
W/H   ワイヤハーネス
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an electric connection box, and more particularly, to reducing the size and heat generation of an electric connection box mounted on an automobile.
[0002]
[Prior art]
Conventionally, an electric junction box 1 such as a junction box for an automobile contains a circuit body 3 in which an insulating plate 4 and a bus bar 5 are laminated inside an upper case 2 and a lower case 6, as shown in FIG. A large number of relay mounting portions 2a, fuse mounting portions 2b, and connector housing portions 2c are provided on the upper surface of the case 2.
[0003]
[Patent Document 1]
JP-A-5-15036
[Problems to be solved by the invention]
In recent years, the number of electrical components has increased rapidly along with the sophistication of automobiles, the number of electric circuit systems in vehicles has increased, and the number of mounted electrical components such as relays has increased. On the other hand, there is a contradictory problem that a mounting space for an electric junction box and the like is reduced in order to realize a reduction in the size of the vehicle body and a secure indoor space. In addition, in order to make the electrical junction box as small as possible, the density of electrical components such as relays mounted on the electrical junction box is increasing, and the amount of heat generated thereby increases. I have.
[0005]
The present invention has been made in view of the above problems, and has as its object to reduce the size of an electric junction box and prevent overheating.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, the present invention provides a circuit body having a printed circuit provided on one surface of a substrate and a bus bar provided on the other surface inside a case, and a metal radiating fin provided on the other surface side of the circuit body. While one surface of the heat radiation fin is brought into close contact with the bus bar and the other surface is exposed to the outside, an electric component is arranged with a gap on the printed circuit side of the circuit body, and a terminal of the electric component is disposed. An electric terminal, wherein the terminal is connected to one end of the relay bus bar, and the other end of the relay bus bar is connected to an end of the bus bar fixed to the substrate. We provide junction boxes.
[0007]
The above-mentioned electric component is composed of a board relay connected to the bus bar by soldering or welding. Note that the present invention is not limited to the board relay, and may be applied to electric components and electronic components that need to be connected to the bus bar.
[0008]
With the above configuration, the printed circuit is provided on one side of the board and the bus bar is provided on the other side, so that the circuit body is smaller and thinner than a conventional circuit configuration in which bus bars and insulating plates are stacked. Can be.
Furthermore, since the radiating fins exposed to the outside are in contact with the bus bars of the circuit body, heat generated by the bus bar can be effectively radiated to the outside through the radiating fins. It is possible to prevent overheating inside the connection box.
[0009]
The electrical components, such as the board relay, which need to be connected to the bus bar, cannot be arranged on the bus bar arrangement side and must be arranged on the printed circuit side since the bus bar is arranged in close contact with the heat radiation fins. When the terminals of the electric component are arranged on the printed circuit side and protruded toward the bus bar through the circuit board, the terminals and the bus bar can be directly connected by soldering or welding.
However, since the ends of the terminals must be soldered with the busbars penetrated, the terminals protrude between the busbars and the radiating fins, reducing the degree of adhesion between the radiating fins and the busbars. It will fade away.
Therefore, in the present invention, the terminals of the electric component are arranged in the opposite direction so as to protrude toward the opposite side to the circuit body, while the bus bar fixed to the substrate of the circuit body is connected to the bus bar, and the electric component is connected to the bus bar. And a relay bus bar for solder connection are provided, so to speak, the bus bar is divided. Since the busbar fixed to the board and the electric component are connected via the relay busbar, the terminal of the electric component can be prevented from penetrating the busbar and hindering the contact between the radiating fin and the busbar. Stable can be ensured.
[0010]
Specifically, a bus bar fixed to the other surface of the board of the circuit body projects from an edge of the board, and the other end of the relay bus bar is welded to a projecting end of the bus bar, and one end of the relay bus bar is The terminal is bent and extended to a position facing the relay terminal beyond the circuit body and the main body of the board relay, and the tip is connected to the terminal of the board relay by soldering.
[0011]
A dummy bus bar is provided on the other surface of the substrate, an end of the dummy bus bar is protruded from an edge of the substrate, and the protruding portion is bent toward one surface of the substrate. It is preferable that the electrical component be stably held by contacting the resin surface of the main body.
[0012]
That is, since the electronic component merely connects its terminal to the relay bus bar, a load may be intensively applied to the solder connection portion between the terminal and the relay bus bar due to vehicle vibration or the like. In this case, as described above, the load caused by vibration can be absorbed by the dummy bus bar by bringing the dummy bus bar into contact with the resin surface of the main body of the electronic component, and cracks are formed in the connection portion between the terminal and the bus bar. It can be prevented from occurring.
Further, by bringing the metal dummy bus bar into contact with the electronic component which is a heat-generating component, it is possible to radiate heat to the radiating fins via the dummy bus bar.
[0013]
It is preferable that the circuit body has a configuration in which a semiconductor switching element (FET) is mounted on one surface side of the substrate and is electrically connected to the bus bar through a through hole formed in the substrate.
That is, a part of the relay is replaced with a small semiconductor switching element, the semiconductor switching element is mounted on a printed circuit board, and connected to a bus bar on the back side of the printed circuit board through a through-hole of the board, so that the circuit is densely packed. Can be formed and the weight can be reduced.
However, replacing all of the relays with the above-mentioned semiconductor switching elements is extremely costly, and may not be mounted on the circuit body in terms of space.Therefore, the circuit body can be mounted on the circuit board via the relay bus bar using the above-described board relay. Connected to the busbar.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to the drawings.
1 to 3 show a first embodiment.
FIG. 1 shows an electric junction box 10 for an automobile, an outer case 20, an inner case 18 assembled to the outer case 20, a linear bus bar 19 arranged on one side of the inner case, and an inner case 18; And a heat dissipating fin 21 for closing a side surface of the outer case 20.
[0015]
As shown in FIGS. 1 to 3, the circuit body 23 has a printed circuit 16 provided on one surface 11 a of the substrate 11, while bus bars 12 to 14 having a required shape are fixed on the other surface 11 b, and Terminals 17a of electronic components such as a semiconductor switching element (FET) 17 to be mounted are electrically connected to the bus bars 12 to 14 through through holes (not shown) of the substrate 11. Also, the upper ends of the bus bars 12 and 13 projecting from above the substrate 11 are bent upward in a stepped manner to provide the terminal portions 12a and 13a, and the lower ends of the required bus bars 13 and 14 are bent downward in a stepped manner. Thus, the connection portions 13b and 14a are formed.
[0016]
A board-type relay 22 is arranged on the printed circuit 16 side of the board 11 with a gap, and its terminal 22 a faces in the opposite direction to the circuit body 23. The terminal 22a is soldered to the bent upper end 15a of the relay bus bar 15. The relay bus bar 15 is bent beyond the main body 22b of the relay 22 and the circuit body 23, and the bent lower end 15b is connected to the connection portions 13b and 14a of the bus bars 13 and 14 by soldering. ing.
The connection between the terminal 22a of the relay 22 and the upper end portion 15a of the relay terminal 15 and the connection between the lower end portion 15b of the relay terminal 15 and the connection portions 13b and 14a of the bus bars 13 and 14 are replaced with solder connections. You may connect by welding. Further, an FET may be arranged in a gap between the main body 22b of the relay and the substrate 11.
[0017]
The outer case 20 has a side opening 20d and an upper surface opening 20c, and has a connector housing portion 20a on the lower surface for fitting and connecting a connector C of a terminal of a wire harness W / H as an external circuit. A guide groove 20b of the inner case 18 is provided on a side wall to be formed.
The straight bus bar 19 has an upper end bent to form a terminal portion 19a, and a lower end formed as a male terminal portion 19b.
[0018]
The inner case 18 has a substantially T-shaped cross section including an upper wall portion 18a and a partition wall portion 18b. The upper wall portion 18a includes a fuse accommodating portion 18c and a fusible link accommodating portion 18d.
The heat dissipating fins 21 have a large number of strip-shaped heat dissipating fins 21a arranged on one side of a metal plate.
[0019]
To assemble the electric connection box 10, the male terminal portion 19b of the linear bus bar 19 is housed so as to protrude into the connector housing portion 20a of the outer case 20, and the partition wall portion 18b of the inner case 18 is slid into the guide groove 20b. The upper wall portion 18a is fitted to close the upper surface opening 20c of the outer case 20, and the terminal portion 19a is projected to the input side in the fuse accommodating portion 18c or the fusible link accommodating portion 18d.
Further, the circuit body 23 is accommodated with the partition wall portion 18b of the inner case 18 interposed therebetween, and the terminal portions 12a to 14a of the bus bars 12 to 14 are projected to the output side in the fuse accommodating portion 18c or the fusible link accommodating portion 18d. . The heat radiation fins 21 close the side openings 20 d of the outer case 20, and the heat radiation fins 21 are in contact with the bus bars 12 to 14 of the circuit body 23.
[0020]
With the above configuration, the printed circuit 16 is provided on the one surface 11a of the circuit board 11 and the bus bars 12 to 14 are arranged on the other surface 11b. -It can be made thin.
In addition, as a relay function, a small-sized semiconductor switching element (FET) 17 is partially substituted while leaving the board-type relay 22, so that a circuit can be formed with high density and the weight can be reduced. .
In addition, since the heat radiation fins 21 exposed to the outside are brought into contact with the bus bars 12 to 14 of the circuit body 23, heat generated by the bus bars 12 to 14 is effectively radiated to the outside through the heat radiation fins 21. Thus, overheating of the circuit body 23 can be prevented.
[0021]
When the relay 22 is connected to the circuit, the radiating fins 21 are provided on the other surface 11b of the substrate 11, so that the fins 21 are arranged on the one surface 11a. However, as in the comparative example shown in FIG. If the terminal 22a of the relay 22 penetrates the board 11 and is directly connected to the bus bars 12 to 14, the terminal H must be soldered with the tip of the terminal 22a penetrating the bus bars 12 to 143. 22a protrudes between the bus bars 12 to 14 and the heat radiating fins 21, the degree of adhesion between the heat radiating fins 21 and the bus bars 12 to 14 is reduced, and the heat radiating effect is reduced.
However, according to the present invention, since the bus bars 13 and 14 are solder H-connected below the board 11 via the relay bus bar 15, the contact between the heat radiation fins 21 and the bus bars 12 to 14 is not hindered. Heat radiation performance can be secured stably.
[0022]
Further, since the terminal 22a of the relay 22 is oriented in the direction opposite to the side where the substrate 11 is located, the relay bus bar 15 and the terminal 22a of the relay 22 are separated from the printed circuit 16, so that circuit interference can be reliably prevented.
[0023]
FIGS. 5A and 5B show a second embodiment.
The difference from the first embodiment is that a dummy bus bar 30 for holding a relay is provided together with the bus bars 12 to 14 on the other surface 11b side of the substrate 11.
[0024]
The dummy bus bar 30 is adhered to the other surface 11b of the substrate 11, and the upper end protrudes from the upper edge of the substrate 11 and is bent upward in a step-like manner so that the upper end protrudes toward the one surface 11a of the substrate 11. Thus, the contact portion 30a is formed.
Then, as shown in FIG. 5B, the contact portion 30a of the dummy bus bar 30 is held in contact with the resin surface of the main body 22a of the relay 22.
[0025]
With the above configuration, the relay 22 in which the terminal 22a is connected to the upper end 15a of the relay bus bar 15 by solder H can be held by the dummy bus bar 30 in contact with the main body 22b. It can be absorbed by the bus bar 30 and the occurrence of cracks at the soldered portion can be prevented.
Further, the dummy bus bar 30 is brought into contact with the main body 22b of the relay 22, so that the heat generated by the relay main body 22b is transferred to the heat dissipating fins 21 via the dummy bus bar 30 to be radiated, thereby preventing overheating of the circuit. Can assist.
The dummy bus bar may penetrate the substrate 11 and protrude toward one side 11a. The other configuration is the same as that of the first embodiment, and the description is omitted.
[0026]
Further, as a modified example of the dummy bus bar, as shown in FIGS. 6A and 6B, the upper end protrudes from the upper end edge of the substrate 11 and is bent in a U-shape so as to be closer to the one surface 11a side of the substrate 11. It is also suitable as the contact portion 31a by protruding to the end.
[0027]
【The invention's effect】
As is clear from the above description, according to the present invention, the printed circuit is provided on one side of the board, and the circuit body provided with the bus bar on the other side is used. Since the radiating fin exposed to the outside is in contact with the bus bar of the circuit body, the heat generated by the bus bar can be radiated to the outside through the radiating fin to prevent overheating of the circuit body.
Also, when the bus bar of the circuit body and the terminal of the relay are connected by soldering, the terminal of the relay is projected in the opposite direction to the circuit body, and the terminal is connected by soldering to the relay bus bar connected to the bus bar of the circuit body. In addition, the terminals of the relay do not protrude to the radiating fin side, and do not hinder the contact between the bus bar and the radiating fin, so that the radiation performance can be secured stably.
[0028]
Further, by contacting the dummy bus bar protruding from the circuit body with the resin surface of the main body of the electronic component, it is possible to stably support the electrical component whose terminals are merely connected to the bus bar. Therefore, the load caused by the vehicle vibration can be absorbed by the dummy bus bar, and the occurrence of cracks at the connection portion between the electronic component and the relay bus bar can be prevented, and the heat generated by the electric component is transferred to the heat dissipating fins through the dummy bus bar. Heat is transferred and the heat dissipation effect can be improved.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of an electric junction box according to a first embodiment of the present invention.
FIG. 2 is a perspective view showing a connection mode of a relay (electric component).
FIG. 3 is a sectional view showing a connection mode of a relay (electric component).
FIG. 4 is a sectional view showing a comparative example.
FIG. 5A is a perspective view showing a connection mode of a relay (electric component) according to a second embodiment, and FIG. 5B is a cross-sectional view.
FIG. 6A is a perspective view illustrating a connection mode of a relay (electric component) according to a modification, and FIG. 6B is a cross-sectional view.
FIG. 7 is a perspective view showing a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Electric connection box 11 Substrate 12-14 Bus bar 15 Relay bus bar 16 Printed circuit 17 FET
18 Inner case 19 Linear bus bar 20 Outer case 21 Heat radiating fin 22 Relay (electric part)
23 Circuits 30, 31 Dummy Bus Bar C Connector H Solder W / H Wire Harness

Claims (4)

基板の一面にプリント回路を設けると共に他面にバスバーを設けている回路体をケース内部に備え、該回路体の他面側に金属製の放熱用フィンを配置し、該放熱用フィンの一面を上記バスバーと密着させると共に他面を外部に露出させる一方、上記回路体のプリント回路側に隙間をあけて電気部品を配置し、該電気部品の端子を回路体と反対方向に突出させると共に該端子を中継バスバーの一端と接続し、該中継バスバーの他端を上記基板に固定している上記バスバーの端部と接続していることを特徴とする電気接続箱。A printed circuit is provided on one side of the board and a circuit body provided with a bus bar on the other side is provided inside the case, a metal radiating fin is arranged on the other side of the circuit body, and one side of the radiating fin is placed on the other side. While the other surface is exposed to the outside while being in close contact with the bus bar, an electric component is arranged with a gap on the printed circuit side of the circuit body, and a terminal of the electric component is protruded in a direction opposite to the circuit body and the terminal is formed. Is connected to one end of a relay bus bar, and the other end of the relay bus bar is connected to an end of the bus bar that is fixed to the substrate. 上記電気部品は、上記バスバーと半田付け或いは溶接で接続する基板リレーである請求項1に記載の電気接続箱。The electric connection box according to claim 1, wherein the electric component is a board relay connected to the bus bar by soldering or welding. 上記回路体の基板の他面に固定するバスバーは基板の端縁より突出させ、該バスバーの突出端に上記中継バスバーの他端を溶接すると共に、上記中継バスバーの一端は上記回路体および上記基板リレーの本体部を越えてリレー端子と対向する位置へと屈曲させて延在させ、その先端を上記基板リレーの端子と半田付けで接続している請求項2に記載の電気接続箱。A bus bar fixed to the other surface of the board of the circuit body is protruded from an edge of the board, and the other end of the relay bus bar is welded to a protruding end of the bus bar, and one end of the relay bus bar is connected to the circuit body and the board. 3. The electrical junction box according to claim 2, wherein the electrical junction box is bent and extended to a position facing the relay terminal beyond the main body of the relay, and a tip thereof is connected to the terminal of the board relay by soldering. 上記基板の他面側にダミーバスバーを設け、該ダミーバスバーの端部は上記基板の端縁より突出させ、該突出部を基板の一面側へと屈曲させ、該屈曲端部を上記電気部品の本体部の樹脂面と当接させて該電気部品を安定保持する構成としている請求項1乃至請求項3のいずれか1項に記載の電気接続箱。A dummy bus bar is provided on the other surface of the substrate, an end of the dummy bus bar protrudes from an edge of the substrate, and the protruding portion is bent toward one surface of the substrate. The electric connection box according to any one of claims 1 to 3, wherein the electric component is stably held by being brought into contact with a resin surface of the main body.
JP2002295346A 2002-10-08 2002-10-08 Electrical junction box Expired - Fee Related JP3876813B2 (en)

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