JP4460061B2 - Electrical junction box - Google Patents

Electrical junction box Download PDF

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JP4460061B2
JP4460061B2 JP2005158621A JP2005158621A JP4460061B2 JP 4460061 B2 JP4460061 B2 JP 4460061B2 JP 2005158621 A JP2005158621 A JP 2005158621A JP 2005158621 A JP2005158621 A JP 2005158621A JP 4460061 B2 JP4460061 B2 JP 4460061B2
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heat
substrate
junction box
metal core
heat collecting
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JP2006019711A (en
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真一 陣鎌
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THE FURUKAW ELECTRIC CO., LTD.
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Description

本発明は、電気接続箱に関するものであり、特に、放熱効率を高めることができる電気接続箱に関するものである。   The present invention relates to an electrical junction box, and more particularly, to an electrical junction box that can improve heat dissipation efficiency.

従来より、発熱素子をマウントしたプリント基板と放熱板を備えた電気接続箱が知られており、例えば、自動車に用いられている。図６は、従来の電気接続箱１０の構成を示す側断面図である。同図において、電気接続箱１０は、下面側が開口し、ロック部１１ａを有する箱型の上部カバー１１と、この上部カバー１１に嵌め合わされ、ロック部１２ａを有する下部カバー１２とを備えている。   2. Description of the Related Art Conventionally, an electrical connection box including a printed circuit board on which a heating element is mounted and a heat radiating plate is known, and is used in, for example, automobiles. FIG. 6 is a side sectional view showing a configuration of a conventional electrical junction box 10. In the figure, an electrical junction box 10 includes a box-shaped upper cover 11 having an opening on the lower surface side and having a lock portion 11a, and a lower cover 12 fitted to the upper cover 11 and having a lock portion 12a.

この下部カバー１２の底部１２ｂの中央部分には、金属製の矩形板状で外部放熱用の放熱板１３が固定されている。この放熱板１３の四隅のコーナ部には、各ネジ１４の軸部１４ａが挿通する挿通孔１３ａがそれぞれ形成されている。放熱板１３上の両側には、発熱素子放熱用の放熱板１５、１５が上記各ネジ１４を介してそれぞれ締結固定されるようになっている。   A heat radiating plate 13 for external heat radiation is fixed to a central portion of the bottom portion 12b of the lower cover 12 in the shape of a metal rectangular plate. Insertion holes 13a through which the shaft portions 14a of the respective screws 14 are inserted are formed in the corner portions of the four corners of the heat radiating plate 13, respectively. On both sides of the heat radiating plate 13, heat radiating plates 15, 15 for radiating the heat generating elements are fastened and fixed via the screws 14.

放熱板１５の下端両側には、一対の脚部１６、１６が外側に９０゜折り曲げ形成されている。放熱板１５の下側の中央には、一対の中途部１７、１７が内側に９０゜折り曲げ形成されている。発熱素子放熱用の放熱板１５の各脚部１６は、各中途部１７より下方に延びている。各脚部１６の中央部には、ネジ孔１６ａが形成されている。このネジ孔１６ａに外部放熱用の放熱板１３の挿通孔１３ａより挿通されたネジ１４の軸部１４ａが螺合されることにより、発熱素子放熱用の放熱板１５が外部放熱用の放熱板１３上に締結固定されるようになっている。   On both sides of the lower end of the heat radiating plate 15, a pair of leg portions 16, 16 are bent outward by 90 °. A pair of midway portions 17 and 17 are bent inward by 90 ° at the center below the heat sink 15. Each leg portion 16 of the heat radiating plate 15 for radiating the heat generating element extends downward from each midway portion 17. A screw hole 16 a is formed at the center of each leg 16. The shaft portion 14a of the screw 14 inserted through the insertion hole 13a of the heat radiating plate 13 for external heat radiation is screwed into the screw hole 16a, whereby the heat radiating plate 15 for heat radiating element heat radiates the heat radiating plate 13 for external heat radiation. It is designed to be fastened and fixed on the top.

また、発熱素子放熱用の放熱板１５の各中途部１７には、各ネジ１８の軸部１８ａが挿通する挿通孔１７ａが形成されている。この挿通孔１７ａより挿通されたネジ１８の軸部１８ａがプリント基板（基板）１９のネジ孔１９ａに螺合されることにより、各発熱素子放熱用の放熱板１５の一対の中途部１７、１７にプリント基板１９が締結固定されるようになっている。   Further, through holes 17a through which the shaft portions 18a of the respective screws 18 are inserted are formed in the respective intermediate portions 17 of the heat radiating plate 15 for radiating the heat generating elements. The shaft portion 18 a of the screw 18 inserted through the insertion hole 17 a is screwed into the screw hole 19 a of the printed circuit board (substrate) 19, whereby a pair of intermediate portions 17, 17 of the heat radiating plate 15 for radiating each heat generating element. The printed circuit board 19 is fastened and fixed.

このプリント基板１９上には、各発熱素子放熱用の放熱板１５に接触するように複数の発熱素子２０がマウントされているとともに、各種のチップ部品（電子部品）２１がマウントされている。また、プリント基板１９の両側には、各発熱素子放熱用の放熱板１５の各脚部１６が入るコ字状の切欠部１９ｂが形成されている。   A plurality of heating elements 20 are mounted on the printed circuit board 19 so as to be in contact with the heat dissipation plate 15 for radiating each heating element, and various chip components (electronic components) 21 are mounted. Further, on both sides of the printed board 19, U-shaped notches 19b into which the legs 16 of the heat radiating plates 15 for radiating the heat generating elements are inserted are formed.

特開平１０−２６２３１７号公報Japanese Patent Laid-Open No. 10-262317

ところで、近時では、自動車に多くの機能が付加されるようになるに従って、電源系や情報通信系の回路を制御したり、保護したりするための発熱素子を、電気接続箱のプリント基板に数多く搭載せざるを得ない状況になっている。かかる状況では、プリント基板上における発熱量が多くなり、効率良く電気接続箱から外部へ放熱する手段が求められている。すなわち、従来においては、放熱効率が高い電気接続箱が必要になってきている。   Recently, as more functions are added to automobiles, heating elements for controlling and protecting power supply and information communication circuits are installed on the printed circuit board of the electrical junction box. It is in a situation that must be installed in large numbers. In such a situation, the amount of heat generated on the printed circuit board increases, and there is a demand for means for efficiently radiating heat from the electrical junction box to the outside. That is, conventionally, an electrical junction box with high heat dissipation efficiency has become necessary.

しかしながら、従来の電気接続箱１０においては、図６に示したように、外部放熱用の放熱板１３の有効面積が、電気接続箱１０の底面面積により制限されており、かつ、放熱板１３の片面のみを外部に露出させているだけである。そのため、放熱板１３の片面での単なる自然対流と各種伝熱に任せた放熱機構になるため、放熱効率が低いという問題があった。   However, in the conventional electric junction box 10, as shown in FIG. 6, the effective area of the heat radiating plate 13 for external heat radiation is limited by the bottom surface area of the electric junction box 10, and Only one side is exposed to the outside. For this reason, there is a problem that the heat radiation efficiency is low because the heat radiation mechanism is left to simple natural convection and various types of heat transfer on one side of the heat radiation plate 13.

放熱効率を高くするために、発熱素子の間隔を広げたり、放熱面を広く取るなどの対策がとられることもあるが、自動車内での電気接続箱１０のスペースには限界があるため、もはや電気接続箱１０の大型化では対応しきれなくなってきた。
また放熱効率を高くするために、新たにファンなどの冷却部品を設けることも考えられるが、自動車のコストアップやそのための電力が必要になるなどの問題が生じるため、できるだけ冷却・放熱のための電力消費する別部品がなくとも、発熱部品の増加等に伴う電気接続箱１０の発熱量上昇にある程度対応できるような、低コストかつ高い放熱効率で筐体内部の熱を外部に放出することが可能な電気接続箱１０が求められていた。 In order to increase the heat dissipation efficiency, measures such as increasing the interval between the heating elements or increasing the heat dissipation surface may be taken. However, the space of the electric junction box 10 in the automobile is limited, so it is no longer necessary. Increasing the size of the electric junction box 10 has become impossible to cope with.
In order to increase the heat dissipation efficiency, it is conceivable to newly provide cooling parts such as fans. However, problems such as an increase in the cost of automobiles and the need for electric power will arise. Even if there is no separate component that consumes power, the heat inside the housing can be released to the outside with low cost and high heat dissipation efficiency so that it can cope to some extent with the increase in the amount of heat generated by the electrical junction box 10 due to the increase in heat generating components. A possible electrical junction box 10 was sought.

本発明は、上記課題に鑑みてなされたものであって、低コストかつ高い放熱効率で筐体内部の熱を外部に放出することが可能で、かつ小型化が可能な電気接続箱を提供することを目的とする。   The present invention has been made in view of the above problems, and provides an electrical junction box that can discharge heat inside the housing to the outside with low cost and high heat dissipation efficiency and can be downsized. For the purpose.

上述した課題を解決し、目的を達成するために、本発明は、発熱素子と、該発熱素子を実装する基板と、該基板に固定された金属製の集熱部と、前記発熱素子、前記基板および前記集熱部を収容する筐体と、前記集熱部と固定された脚部と、該脚部に固定され前記筐体の外部に露出されるとともに筒状形状をなす筒状部と、該筒状部の一端側に形成された放熱窓と、他端側に形成された吸気窓とを備えた金属製の放熱部とを有し、前記放熱部は、コ字形状の複数の放熱板を、それぞれの外部露出部同士が所定間隔を介して位置するように重ねあわせて構成されていることを特徴とする。 In order to solve the above-described problems and achieve the object, the present invention provides a heating element, a substrate on which the heating element is mounted, a metal heat collecting portion fixed to the substrate, the heating element, A housing for housing the substrate and the heat collecting portion; a leg portion fixed to the heat collecting portion; a tubular portion fixed to the leg portion and exposed to the outside of the housing; , a heat radiation window formed in one end of the cylindrical portion, possess a metallic heat radiation member having an intake window formed in the other end, the heat radiation member, a plurality of U-shaped The heat radiating plate is configured to overlap each other so that the respective externally exposed portions are located at a predetermined interval .

このような構成によれば、発熱素子から発した熱は、基板から集熱部を介して放熱部に伝導される。放熱部では、前記熱が脚部から筒状部へ伝導され、該筒状部の表面と内面とに放出される。ここで集熱部および放熱部はすべて金属製であるため、発熱素子で発した熱は迅速に筐体外部に伝熱される。
また筒状部内は局所的に熱がこもり易い閉鎖空間となっているので、空気が熱せられることで上昇気流が生じる。ここで本発明の電気接続箱は、使用時には、放熱窓が上側に位置するように使用される。よって上記上昇気流によって、筒状部内の熱せられた空気は放熱窓から外部に放出される。それとともに吸気窓からは新たな熱が筒状部内部に取り入れられる。
このように筒状部は表面と内面への空気への単なる各種伝熱や自然対流だけでなく、煙突効果により筒状部内部の空気を外部の空気と対流を促す構造としていることにより、放熱効率を高めることができる。
ここで、このような集熱部、放熱部の構造は、金属で構成されているため加工性がよく、形状もそれほど複雑にはならないので、機能のわりに低コストで構成することが可能である。
また本発明においては、発熱素子をできるだけ近づけて配置すれば、その分、基板と集熱部との温度勾配を確保できるので、その分、基板から集熱部への熱伝導が速やかに行われる。したがって基板が小型化し易いので、電気接続箱も小型化することが可能である。 According to such a configuration, the heat generated from the heating element is conducted from the substrate to the heat radiating part via the heat collecting part. In the heat radiating portion, the heat is conducted from the leg portion to the cylindrical portion, and is released to the surface and the inner surface of the cylindrical portion. Here, since the heat collecting part and the heat radiating part are all made of metal, the heat generated by the heating element is quickly transferred to the outside of the housing.
Moreover, since the inside of the cylindrical portion is a closed space in which heat is likely to be trapped locally, an upward airflow is generated when the air is heated. Here, the electrical junction box of the present invention is used so that the heat dissipation window is positioned on the upper side when in use. Therefore, the heated air in the cylindrical portion is released to the outside from the heat radiating window by the upward air flow. At the same time, new heat is taken into the cylindrical portion from the intake window.
In this way, the cylindrical part is not only a simple heat transfer or natural convection to the air on the surface and the inner surface, but also has a structure that promotes convection of the air inside the cylindrical part with the outside air by the chimney effect. Efficiency can be increased.
Here, since the structure of such a heat collection part and a heat radiation part is comprised with the metal, since workability is good and a shape does not become so complicated, it can be comprised at low cost instead of a function. .
Further, in the present invention, if the heating elements are arranged as close as possible, a temperature gradient between the substrate and the heat collecting part can be ensured accordingly, so that heat conduction from the substrate to the heat collecting part is performed quickly. . Therefore, since the substrate can be easily downsized, the electrical junction box can also be downsized.

よって本発明によれば、低コストかつ高い放熱効率で筐体内部の熱を外部に放出することが可能で、かつ小型化が可能な電気接続箱を提供することができる。   Therefore, according to the present invention, it is possible to provide an electrical junction box that can release heat inside the housing to the outside with low cost and high heat dissipation efficiency and can be downsized.

また、前記放熱部を、コ字形状の複数の放熱板を、それぞれの外部露出部同士が所定間隔を介して位置するように重ねあわせて構成するので、非常に簡単なコ字形状の放熱板を組み合わせるだけで放熱部を構成することができる。 Further, the heat radiating portion, a plurality of the heat radiating plate of the U-shape, the respective outer exposed portions are constituted by superposed so as to be positioned with a predetermined interval, the heat radiating plate of very simple U-shaped The heat radiation part can be configured simply by combining the two.

また上記発明において、前記基板は、金属コアが絶縁層により挟み込まれてなるメタルコア基板であってもよい。   In the above invention, the substrate may be a metal core substrate in which a metal core is sandwiched between insulating layers.

この場合、メタルコア基板は、発熱素子で発した熱を速やかに金属コアに伝熱することができるので、発熱素子の熱破壊が防止される。   In this case, since the metal core substrate can quickly transfer the heat generated by the heat generating element to the metal core, the heat destruction of the heat generating element is prevented.

また上記発明において、前記メタルコア基板の前記金属コアが、前記集熱部と、直接もしくは熱伝導性が前記絶縁層のものよりも高い緩衝層を介して接続されていてもよい。   In the above invention, the metal core of the metal core substrate may be connected to the heat collecting part directly or via a buffer layer having higher thermal conductivity than that of the insulating layer.

この場合、基板の熱が絶縁層を介さず集熱部に伝導されるので、放熱効率がよくなり、好ましい。   In this case, since the heat of the substrate is conducted to the heat collecting part without passing through the insulating layer, the heat radiation efficiency is improved, which is preferable.

本発明によれば、低コストかつ高い放熱効率で筐体内部の熱を外部に放出することが可能で、かつ小型化が可能な電気接続箱を提供することができる。   ADVANTAGE OF THE INVENTION According to this invention, the electrical junction box which can discharge | release the heat | fever inside a housing | casing outside with low cost and high heat dissipation efficiency, and can be reduced in size can be provided.

以下に、本発明にかかる電気接続箱の実施例を図面に基づいて詳細に説明する。なお、この実施例によりこの発明が限定されるものではない。   Below, the Example of the electrical-connection box concerning this invention is described in detail based on drawing. Note that the present invention is not limited to the embodiments.

図１は、本発明にかかる一実施例による電気接続箱１００の構成を示す斜視図である。図２は、図１および図４に示したＸ−Ｘ'線視断面図である。図３は、図２に示した基板１０５、集熱板１０６Ａ、集熱板１０６Ｂ、放熱板１０７および放熱板１０８を分解した状態を示す断面図である。図４は、図１に示したＹ−Ｙ'線視断面図である。   FIG. 1 is a perspective view showing a configuration of an electrical junction box 100 according to an embodiment of the present invention. FIG. 2 is a cross-sectional view taken along line XX ′ shown in FIGS. 1 and 4. 3 is a cross-sectional view showing a state in which the substrate 105, the heat collecting plate 106A, the heat collecting plate 106B, the heat radiating plate 107, and the heat radiating plate 108 shown in FIG. 2 are disassembled. 4 is a cross-sectional view taken along line YY ′ shown in FIG.

電気接続箱１００は、電気分配用バスバーやヒューズ類を有するヒューズモジュール部と、基板上にリレーやパワーＭＯＳＦＥＴ、電気抵抗等を搭載した実装部品モジュール部と、ワイヤハーネスと接続されるコネクタを有するコネクタモジュール部とを備えている。   The electrical junction box 100 is a connector having a fuse module part having an electric distribution bus bar and fuses, a mounting part module part having a relay, a power MOSFET, an electrical resistor and the like mounted on a substrate, and a connector connected to a wire harness. And a module part.

具体的には、電気接続箱１００において、図１、図４に示したアッパーケース１０１は、下面が開口された略箱形状を有しており、上述した実装部品モジュール部を収容している。ロアーケース１０２は、上面が開口されており、アッパーケース１０１の下部に設けられている。このロアーケース１０２は、上述したコネクタモジュール部を収容している。ロアーカバー１０３は、ロアーケース１０２を覆うようにして、ロック部（図示略）を介して、アッパーケース１０１の下部に設けられている。これらのアッパーケース１０１、ロアーケース１０２およびロアーカバー１０３は、筐体を構成している。   Specifically, in the electrical junction box 100, the upper case 101 shown in FIGS. 1 and 4 has a substantially box shape with an open bottom surface and accommodates the above-described mounting component module section. The lower case 102 has an upper surface opened and is provided below the upper case 101. The lower case 102 accommodates the connector module portion described above. The lower cover 103 is provided at the lower part of the upper case 101 via a lock portion (not shown) so as to cover the lower case 102. The upper case 101, the lower case 102, and the lower cover 103 constitute a casing.

発熱素子１０４は、基板１０５に実装されており、パワーＭＯＳＦＥＴ等である。基板１０５は、アッパーケース１０１内に設けられており、熱伝導率が高いメタルコア基板である。集熱板１０６Ａは、図２に示したように、断面略Ｌ字形状を有しており、熱伝導シートを介してネジ（図示略）により基板１０５の一方の辺に沿って、取り付けられている。   The heating element 104 is mounted on the substrate 105 and is a power MOSFET or the like. The substrate 105 is a metal core substrate that is provided in the upper case 101 and has high thermal conductivity. As shown in FIG. 2, the heat collecting plate 106 </ b> A has a substantially L-shaped cross section, and is attached along one side of the substrate 105 with a screw (not shown) through a heat conductive sheet. Yes.

集熱板１０６Ｂは、集熱板１０６Ａと同様にして、断面略Ｌ字形状を有しており、熱伝導シート（図示略）を介してネジ（図示略）により基板１０５の他方の辺に沿って取り付けられている。すなわち、集熱板１０６Ａと集熱板１０６Ｂとは、対向配置されている。また、これらの集熱板１０６Ａおよび集熱板１０６Ｂは、発熱素子１０４で発生した熱を集める機能を備えている。   The heat collecting plate 106B has a substantially L-shaped cross section in the same manner as the heat collecting plate 106A, and extends along the other side of the substrate 105 with a screw (not shown) through a heat conductive sheet (not shown). Attached. That is, the heat collecting plate 106A and the heat collecting plate 106B are disposed to face each other. Further, the heat collecting plate 106A and the heat collecting plate 106B have a function of collecting heat generated by the heating element 104.

図５（ａ）〜（ｃ）は、基板１０５と集熱板１０６Ａ，１０６Ｂの接続構造の例を示す図である。
図５（ａ）に示すように、基板１０５は、銅やアルミなどの熱伝導性が良い金属からなる金属コア１０５ａと、該金属コア１０５ａの表裏面を挟み込む絶縁層１０５ｂ、１０５ｃからなるメタルコア基板である。メタルコア基板は均熱化作用に優れ、発熱素子１０４の熱を基板各部に分散することができるため、発熱素子１０４が局所的に高温になることによって熱破壊されることが防止される。
なお基板１０５上には回路パターンが形成されているが、ここでは図示を省略している。基板１０５と集熱板１０６Ａ、１０６Ｂの接続部では、熱伝導シートなどの緩衝層１１４を介して絶縁層１０５ｂ上に発熱素子１０４の他に集熱板１０６Ａ，１０６Ｂが固定されている。 FIGS. 5A to 5C are diagrams showing an example of a connection structure between the substrate 105 and the heat collecting plates 106A and 106B.
As shown in FIG. 5A, the substrate 105 is a metal core substrate made of a metal core 105a made of a metal having good thermal conductivity such as copper or aluminum, and insulating layers 105b and 105c sandwiching the front and back surfaces of the metal core 105a. It is. The metal core substrate is excellent in temperature-uniforming action and can dissipate the heat of the heat generating element 104 to each part of the substrate, so that the heat generating element 104 is prevented from being thermally destroyed due to a local high temperature.
Although a circuit pattern is formed on the substrate 105, the illustration is omitted here. At the connection between the substrate 105 and the heat collecting plates 106A and 106B, the heat collecting plates 106A and 106B are fixed on the insulating layer 105b via the buffer layer 114 such as a heat conductive sheet.

緩衝層１１４は、たとえばエフコ社製、エフコＴＭシート等、熱伝導性が良好であって基板１０５と集熱板１０６Ａ、１０６Ｂに対して密着性の良い材料で構成している。したがって基板１０５から集熱板１０６Ａ、１０６Ｂへの熱の伝導は、緩衝層１１４を介して効率よく行われる。   The buffer layer 114 is made of a material having good thermal conductivity and good adhesion to the substrate 105 and the heat collecting plates 106A and 106B, such as an EFCO TM sheet manufactured by EFCO. Therefore, heat conduction from the substrate 105 to the heat collecting plates 106 </ b> A and 106 </ b> B is efficiently performed through the buffer layer 114.

また図５（ｂ）に示すように、基板１０５と集熱板１０６Ａ、１０６Ｂの接続部において絶縁層１０５ｂが無く、金属コア１０５ａが露出された基板１０５を用い、露出した金属コア１０５ａ上に直接、集熱板１０６Ａ、１０６Ｂをネジ止めなどにより固定することもできる。
この場合、熱伝導性があまり考慮されていない材料が用いられる場合が多い絶縁層１０５ｂを介さず、基板１０５から集熱板１０６Ａ、１０６Ｂへの熱伝導が行われるので、図５（ａ）の場合に比較して金属コア１０５ａと集熱板１０６Ａ、１０６Ｂ間の熱伝導性がよくなるので、好ましい。 Further, as shown in FIG. 5 (b), the insulating layer 105b is not provided at the connection portion between the substrate 105 and the heat collecting plates 106A and 106B, and the substrate 105 with the exposed metal core 105a is used, and directly on the exposed metal core 105a. The heat collecting plates 106A and 106B can be fixed by screwing or the like.
In this case, heat conduction from the substrate 105 to the heat collecting plates 106A and 106B is performed without using the insulating layer 105b, which often uses a material that does not take heat conductivity into consideration. Compared to the case, the thermal conductivity between the metal core 105a and the heat collecting plates 106A and 106B is improved, which is preferable.

また図５（ｃ）に示すように、基板１０５と集熱板１０６Ａ、１０６Ｂの接続部において絶縁層１０５ｂが無く金属コア１０５ａが露出された基板１０５を用い、露出した金属コア１０５ａ上に半田や熱伝導シートなどから選択される、緩衝層１１４を形成し、その上に集熱板１０６Ａ、１０６Ｂをネジ止めなどにより固定することもできる。
この場合には、図５（ｂ）の場合に比較して金属コア１０５ａと集熱板１０６Ａ、１０６Ｂ間の密着性が高まり、熱伝導性がさらによくなるので好ましい。 Further, as shown in FIG. 5C, the substrate 105 in which the metal core 105a is exposed without the insulating layer 105b at the connection portion between the substrate 105 and the heat collecting plates 106A and 106B is used. A buffer layer 114 selected from a heat conductive sheet or the like may be formed, and the heat collecting plates 106A and 106B may be fixed thereon by screwing or the like.
In this case, it is preferable because the adhesion between the metal core 105a and the heat collecting plates 106A and 106B is increased and the thermal conductivity is further improved as compared with the case of FIG.

集熱板１０６Ａ、１０６Ｂで集められた熱は、放熱板１０７と放熱板１０８からなる放熱部１１５に伝達される。
放熱板１０７は、２枚の側板（脚部１０７ａ、１０７ｂ）と該側板間に固定された背板（外部露出部１０７ｃ）からなる断面コ字形状（図３参照）が折り曲げ加工などにより形成されたものであり、発熱素子１０４で発生した熱を外部露出部１０７ｃから外部へ放熱する機能を備えている。この放熱板１０７の脚部１０７ａおよび１０７ｂは、集熱板１０６Ａおよび集熱板１０６Ｂの各面に合わせるようにして、熱伝導シート（図示略）を介して、ネジ（図示略）により集熱板１０６Ａおよび集熱板１０６Ｂに取り付けられている。放熱板１０７の外部露出部１０７ｃは、アッパーケース１０１から外部に露出している。 The heat collected by the heat collecting plates 106 </ b> A and 106 </ b> B is transmitted to the heat radiating unit 115 including the heat radiating plate 107 and the heat radiating plate 108.
The heat radiating plate 107 has a U -shaped cross section (see FIG. 3) formed of two side plates (leg portions 107a and 107b) and a back plate (externally exposed portion 107c) fixed between the side plates by bending or the like. It has a function of radiating the heat generated in the heating element 104 from the external exposed portion 107c to the outside. The leg portions 107a and 107b of the heat radiating plate 107 are aligned with the respective surfaces of the heat collecting plate 106A and the heat collecting plate 106B, and the heat collecting plate is screwed (not shown) through a heat conductive sheet (not shown). It is attached to 106A and the heat collecting plate 106B. The externally exposed portion 107 c of the heat radiating plate 107 is exposed to the outside from the upper case 101.

放熱板１０８は、放熱板１０７より一回り大きく相似形の断面コ字形状（図３参照）を有している。すなわち放熱板１０８は、２枚の側板（脚部１０８ａ、１０８ｂ）と該側板間に固定された背板（外部露出部１０８ｃ）からなる断面コ字形状（図３参照）が折り曲げ加工などにより形成されたものであり、発熱素子１０４で発生した熱を外部露出部１０８ｃから外部へ放熱する機能を備えている。この放熱板１０８の脚部１０８ａおよび１０８ｂは、放熱板１０７の脚部１０７ａおよび脚部１０７ｂの各面に合わせるようにして、熱伝導シート（図示略）を介して、ネジ（図示略）により脚部１０７ａおよび脚部１０７ｂに取り付けられている。
放熱板１０８の外部露出部１０８ｃは、アッパーケース１０１から外部に露出している。
放熱部１１５は、図２に示すように、これらコ字形状の複数の放熱板１０７、１０８を、それぞれの外部露出部１０７ｃ、１０８ｃ同士が所定間隔Ｗを介して位置するように、重ねあわせた状態でネジ止め固定されて構成されている。 The heat sink 108 has a U -shaped cross-section (see FIG. 3) that is slightly larger than the heat sink 107 and has a similar shape. That is, the heat radiating plate 108 has a U -shaped cross section (see FIG. 3) formed of two side plates (leg portions 108a and 108b) and a back plate (externally exposed portion 108c) fixed between the side plates by bending or the like. And has a function of radiating heat generated by the heating element 104 to the outside from the external exposed portion 108c. The leg portions 108a and 108b of the heat radiating plate 108 are fitted to the respective surfaces of the leg portion 107a and the leg portion 107b of the heat radiating plate 107 by means of screws (not shown) via heat conductive sheets (not shown). It is attached to the part 107a and the leg part 107b.
The externally exposed portion 108c of the heat sink 108 is exposed to the outside from the upper case 101.
As shown in FIG. 2, the heat dissipating part 115 overlaps the plurality of U -shaped heat dissipating plates 107 and 108 so that the externally exposed parts 107 c and 108 c are positioned with a predetermined interval W therebetween. It is configured to be fixed with screws.

これらの放熱板１０７および放熱板１０８は、図４に示したように、外部露出部１０７ｃと外部露出部１０８ｃとの間に隙間１０９が形成されるように、多段構成で設けられている。放熱窓１１０は、アッパーケース１０１の上部に設けられた庇１１３と、外部露出部１０７ｃとの間の形成されており、隙間１０９における放熱経路１１１で、煙突効果により上昇した熱（空気）を外部へ放熱するための窓である。吸気窓１１６は新たな低い温度の空気を隙間１０９に取り込むためのものである。ハウジング１１２は、アッパーケース１０１の上部に設けられている。
このように放熱部１１５は、アッパーケース１０１、ロアーケース１０２，１０３の外部に筒状部１１７を有し、該筒状部１１７は上端部に放熱窓１０９、下端部に吸気窓１１６を有することで両端部が開口した形状を有している。 As shown in FIG. 4, the heat radiating plate 107 and the heat radiating plate 108 are provided in a multistage configuration such that a gap 109 is formed between the external exposed portion 107 c and the external exposed portion 108 c. The heat radiating window 110 is formed between the flange 113 provided on the upper part of the upper case 101 and the externally exposed portion 107c, and the heat (air) raised by the chimney effect is externally transmitted through the heat radiating path 111 in the gap 109. It is a window for radiating heat. The intake window 116 is for taking in air of a new low temperature into the gap 109. The housing 112 is provided on the upper part of the upper case 101.
As described above, the heat dissipating part 115 has the cylindrical part 117 outside the upper case 101 and the lower cases 102 and 103, and the cylindrical part 117 has the heat dissipating window 109 at the upper end and the intake window 116 at the lower end. And has both ends opened.

本実施例の電気接続箱１００によれば、発熱素子１０４から発した熱は、基板１０５から集熱板１０６Ａ，１０Ｂを介して放熱部１１５に伝導される。放熱部１１５では、前記熱が脚部１０７ａ、１０７ｂ、１０８ａ、１０８ｂから筒状部１１７へ伝導され、該筒状部１１７の表面と内面とに放出される。ここで集熱板１０６Ａ、１０６Ｂおよび放熱部１１５はすべて金属製であるため、発熱素子１０４で発した熱は迅速に筐体外部に伝熱される。
また筒状部１１７内は局所的に熱がこもり易い閉鎖空間となっているので、空気が熱せられることで上昇気流が生じる（煙突効果）。ここで本実施例の電気接続箱１００は、図４に示すように、使用時には、放熱窓１１０が上側に位置するように使用される。よって上記上昇気流によって、筒状部１１７内の熱せられた空気は放熱窓１１０から外部に放出される。それとともに吸気窓１１６からは新たな熱が筒状部１１７内部に取り入れられる。これらの動作が繰り返されることで、筒状部１１７内部と外部で空気の対流が促される。
このように筒状部１１７は表面と内面への空気への単なる各種伝熱や自然対流だけでなく、煙突効果により筒状部１１７内部の空気を外部の空気と対流を促す構造としていることにより、放熱効率を高めることができる。 According to the electrical junction box 100 of the present embodiment, the heat generated from the heating element 104 is conducted from the substrate 105 to the heat radiating portion 115 via the heat collecting plates 106A and 10B. In the heat dissipating part 115, the heat is conducted from the leg parts 107 a, 107 b, 108 a, 108 b to the cylindrical part 117 and released to the surface and the inner surface of the cylindrical part 117. Here, since heat collecting plates 106A and 106B and heat radiating portion 115 are all made of metal, heat generated by heating element 104 is quickly transferred to the outside of the housing.
Moreover, since the inside of the cylindrical part 117 becomes a closed space in which heat is likely to be trapped locally, ascending airflow is generated when the air is heated (chimney effect). Here, as shown in FIG. 4, the electrical junction box 100 of the present embodiment is used so that the heat radiation window 110 is positioned on the upper side during use. Therefore, the heated air in the cylindrical portion 117 is released from the heat radiation window 110 to the outside by the upward airflow. At the same time, new heat is taken into the cylindrical portion 117 from the intake window 116. By repeating these operations, air convection is promoted inside and outside the cylindrical portion 117.
As described above, the cylindrical portion 117 has not only simple heat transfer and natural convection to the air on the surface and the inner surface, but also a structure that promotes convection of the air inside the cylindrical portion 117 with external air by the chimney effect. The heat dissipation efficiency can be increased.

ここで、このような集熱板１０６Ａ、１０６Ｂ、放熱部１１５の構造は、金属で構成されているため加工性がよく、形状も図３の通りそれほど複雑ではないコ字形状の放熱板１０７、１０８を所定の間隔Ｗで重ね合わせた、組み合わせ部品からなるので、機能のわりに低コストで構成することが可能である。
なお、本実施例中では、集熱板１０６Ａ、１０６Ｂと、放熱部１１５を別部品として説明したが、例えば、集板１０６Ａ、１０６Ｂと放熱板１０７とを一体化された部品としてもよい。 Wherein such heat collection plates 106A, 106B, the structure of the heat radiating portion 115 may workability because it is composed of metal, shape is not so complicated as in FIG. 3 C-shape of the heat radiating plate 107, Since it consists of the combination parts which overlapped 108 with the predetermined space | interval W, it can be comprised at low cost instead of a function.
In the present embodiment, the heat collecting plates 106A and 106B and the heat radiating portion 115 are described as separate components. However, for example, the heat collecting plates 106A and 106B and the heat radiating plate 107 may be integrated.

また本実施例の電気接続箱１００においては、図３に示すように、発熱素子１０４をできるだけ近づけて配置すれば、その分、基板１０５の温度が高くなり、基板１０５と集熱板１０６Ａ、１０６Ｂとの温度勾配を確保できるので、その分、基板１０５から集熱板１０６Ａ、１０６Ｂへの熱伝導が速やかに行われる。したがって基板１０５が小型化し易いので、電気接続箱１００も小型化することが可能である。
よって本実施例の電気接続箱１００によれば、低コストかつ高い放熱効率で筐体内部の熱を外部に放出することが可能で、かつ小型化が可能な電気接続箱を提供することができる。 Further, in the electrical junction box 100 of the present embodiment, as shown in FIG. 3, if the heating element 104 is arranged as close as possible, the temperature of the substrate 105 is increased accordingly, and the substrate 105 and the heat collecting plates 106A and 106B. Therefore, the heat conduction from the substrate 105 to the heat collecting plates 106A and 106B is performed promptly. Accordingly, the substrate 105 can be easily downsized, and the electrical junction box 100 can also be downsized.
Therefore, according to the electrical junction box 100 of the present embodiment, it is possible to provide an electrical junction box that can release heat inside the housing to the outside with low cost and high heat dissipation efficiency, and can be downsized. .

以上のように、本発明にかかる電気接続箱は、発生する熱量が大きい発熱素子を実装した場合に対して、有用である。   As described above, the electrical junction box according to the present invention is useful for a case where a heating element that generates a large amount of heat is mounted.

本発明にかかる一実施例による電気接続箱１００の構成を示す斜視図である。It is a perspective view which shows the structure of the electrical junction box 100 by one Example concerning this invention. 図１および図４に示したＸ−Ｘ'線視断面図である。FIG. 5 is a sectional view taken along line XX ′ shown in FIGS. 1 and 4. 図２に示した基板１０５、集熱板１０６Ａ、集熱板１０６Ｂ、放熱板１０７および放熱板１０８を分解した状態を示す断面図である。It is sectional drawing which shows the state which decomposed | disassembled the board | substrate 105, the heat collecting plate 106A, the heat collecting plate 106B, the heat sink 107, and the heat sink 108 which were shown in FIG. 図１に示したＹ−Ｙ'線視断面図である。FIG. 2 is a cross-sectional view taken along line YY ′ shown in FIG. 1. （ａ）〜（ｃ）はそれぞれ図２に示した基板１０５、集熱板１０６Ａ、集熱板１０６Ｂについて構成例を示す断面図である。(A)-(c) is sectional drawing which shows the example of a structure about the board | substrate 105, the heat collecting plate 106A, and the heat collecting plate 106B which were respectively shown in FIG. 従来の電気接続箱１０の構成を示す側断面図である。It is a sectional side view which shows the structure of the conventional electrical junction box.

１００ 電気接続箱
１０１ アッパーケース
１０４ 発熱素子
１０５ 基板
１０６Ａ 集熱板（集熱部）
１０６Ｂ 集熱板（集熱部）
１０７ 放熱板
１０８ 放熱板

DESCRIPTION OF SYMBOLS 100 Electrical junction box 101 Upper case 104 Heating element 105 Board | substrate 106A A heat collecting plate (heat collecting part)
106B Heat collector (heat collector)
107 heat sink 108 heat sink

Claims (3)

発熱素子と、
該発熱素子を実装する基板と、
該基板に固定された金属製の集熱部と、
前記発熱素子、前記基板および前記集熱部を収容する筐体と、
前記集熱部と固定された脚部と、該脚部に固定され前記筐体の外部に露出されるとともに筒状形状をなす筒状部と、該筒状部の一端側に形成された放熱窓と、他端側に形成された吸気窓とを備えた、金属製の放熱部とを有し、
前記放熱部は、コ字形状の複数の放熱板を、それぞれの外部露出部同士が所定間隔を介して位置するように重ねあわせて構成されていることを特徴とする
電気接続箱。 A heating element;
A substrate on which the heating element is mounted;
A metal heat collector fixed to the substrate;
A housing for housing the heat generating element, the substrate, and the heat collecting unit;
A leg part fixed to the heat collecting part, a cylindrical part fixed to the leg part and exposed to the outside of the casing and having a cylindrical shape, and heat dissipation formed on one end side of the cylindrical part and windows, comprising an intake window formed in the other end, and a metallic heat radiation member possess,
The said heat radiating part is constituted by overlapping a plurality of U-shaped heat radiating plates so that the respective externally exposed parts are located at a predetermined interval . 前記基板は、金属コアが絶縁層により挟み込まれてなるメタルコア基板であることを特徴とする
請求項１記載の電気接続箱。 The substrate, electrical connection box according to claim 1, wherein the metal core is a metal core substrate consisting sandwiched by the insulating layer. 前記メタルコア基板の前記金属コアが、前記集熱部と、直接もしくは熱伝導性が前記絶縁層のものよりも高い緩衝層を介して接続されていることを特徴とする
請求項２記載の電気接続箱。 3. The electrical connection according to claim 2 , wherein the metal core of the metal core substrate is connected to the heat collecting part directly or via a buffer layer having higher thermal conductivity than that of the insulating layer. box.
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