JP2009284705A - Heat-dissipating structure of electric connection box - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently dissipate heat from an electric part as a heating element and a printed board loading the electric part and having a circuit for power supply to a car body by a simple structure. <P>SOLUTION: The heat-dissipating structure of an electric connection box incorporates the electric part as the heating element and the printed board loading the electric part while having the circuit for power supply. In the heat-dissipating structure of the electric connection box, a metal rod is projected from the car body fixing the electric connection box while a through-hole for inserting the metal rod to a case for the electric connection box and a mounting hole formed on the same axis as the through-hole are formed on the printed board. In the heat-dissipating structure of the electric connection box, the metal rod is inserted into the through-hole for the case and then inserted into the mounting hole for the printed board, at least a part of the outer peripheral surface of the metallic plate is brought into contact with the mounting hole and heat from the printed board is conducted and heat-dissipated to the car body through the metal rod. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は電気接続箱の放熱構造に関し、詳しくは、発熱体となる電気部品や電子部品を搭載し、電源用回路を備えたプリント基板の熱を簡単な構造で効率良く車両ボデイに放熱するものである。   BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat dissipation structure for an electrical junction box. More specifically, the present invention is equipped with an electrical component or an electronic component serving as a heating element, and efficiently dissipates heat from a printed circuit board equipped with a power circuit to a vehicle body It is.

車両の電源と電気的負荷である各電装機器との間に配置される電気接続箱には、電源を分配する電源用回路を備えたプリント基板が内蔵されている。プリント基板には、リレー、ヒューズ等の電気部品やトランジスタなどの電子部品が多数搭載されており、このような搭載部品からの発熱量は、搭載部品の高密度化に伴い増大している。
したがって、前記のような発熱体となる部品を搭載し電源用回路を備えたプリント基板の熱を車両ボデイに放熱することは非常に重要である。 A printed circuit board having a power supply circuit for distributing power is built in an electrical junction box disposed between the power source of the vehicle and each electrical equipment that is an electrical load. A large number of electrical components such as relays and fuses and electronic components such as transistors are mounted on the printed circuit board, and the amount of heat generated from such mounted components increases as the density of the mounted components increases.
Therefore, it is very important to dissipate the heat of the printed circuit board having the power supply circuit mounted with the components to be the heat generating elements as described above to the vehicle body.

従来、電気接続箱の放熱構造が数多く提案されている。例えば、特開平８−２７５３３９号公報（特許文献１）では、図８に示すように、ジャンクションボックス１の電子回路基板２に搭載された発熱性の電子部品３に、折り曲げ加工した金属片４の一側を連結すると共に、ジャンクションボックス１を車体フレーム６に取り付ける金属製ボルト５に前記金属片４の他側を連結することで、電子部品３の熱を金属片４と金属製ボルト５を介して車体フレーム６に伝導させる放熱構造が示されている。   Conventionally, many heat dissipation structures for electrical junction boxes have been proposed. For example, in Japanese Patent Application Laid-Open No. 8-275339 (Patent Document 1), as shown in FIG. 8, a metal piece 4 that is bent into a heat-generating electronic component 3 mounted on an electronic circuit board 2 of a junction box 1 is used. By connecting one side and connecting the other side of the metal piece 4 to a metal bolt 5 for attaching the junction box 1 to the vehicle body frame 6, the heat of the electronic component 3 is transmitted via the metal piece 4 and the metal bolt 5. A heat dissipation structure that conducts to the vehicle body frame 6 is shown.

しかしながら、前記のような放熱構造では発熱性の電子部品３と金属製ボルト５とに連結させる金属片４を別部品として取り付ける必要があり、発熱性の電子部品３の数が多くなると取り付ける金属片４も複雑化、大型化し、コストや取付スペースが増大するという問題がある。したがって、シンプルな構造で、電子回路基板２の熱を効率的に放熱する点では改良の余地が残されている。   However, in the heat dissipation structure as described above, it is necessary to attach the metal pieces 4 to be connected to the heat-generating electronic parts 3 and the metal bolts 5 as separate parts, and the metal pieces to be attached when the number of heat-generating electronic parts 3 increases. 4 is also complicated and large, and there is a problem that costs and mounting space increase. Therefore, there is room for improvement in that the heat of the electronic circuit board 2 is efficiently radiated with a simple structure.

特開平８−２７５３３９号公報JP-A-8-275339

本発明は前記問題に鑑みてなされたものであり、発熱体となる電気部品や電子部品を搭載し電源用回路を備えたプリント基板の熱を、簡単な構造で効率良く車両ボデイに放熱できることを課題としている。   The present invention has been made in view of the above problems, and is capable of efficiently dissipating heat of a printed circuit board equipped with a power supply circuit mounted with an electrical component or an electronic component serving as a heating element to a vehicle body. It is an issue.

前記課題を解決するため、本発明は、発熱体となる電気部品および電子部品を搭載していると共に電源用回路を備えたプリント基板を内蔵した電気接続箱の放熱構造であって、
前記電気接続箱を固定する車両ボデイから金属棒を突設する一方、
前記電気接続箱のケースに金属棒を挿通する貫通穴および、該貫通穴と同一軸線上に設けた取付穴を前記プリント基板に設け、
前記金属棒を前記ケースの貫通穴を通して前記プリント基板の取付穴に挿通し、該金属棒の外周面の少なくとも一部を前記取付穴と接触させ、該金属棒を介して前記車両ボデイにプリント基板の熱を伝導して放熱していることを特徴とする電気接続箱の放熱構造を提供している。 In order to solve the above problems, the present invention is a heat dissipation structure of an electrical junction box having a printed circuit board having a power supply circuit mounted thereon with an electrical component and an electronic component serving as a heating element,
While projecting a metal rod from the vehicle body that fixes the electrical junction box,
A through hole for inserting a metal rod into the case of the electrical connection box, and a mounting hole provided on the same axis as the through hole are provided in the printed circuit board,
The metal rod is inserted into the mounting hole of the printed board through the through hole of the case, at least a part of the outer peripheral surface of the metal bar is brought into contact with the mounting hole, and the printed board is attached to the vehicle body via the metal rod. A heat dissipation structure for an electrical junction box is provided, wherein the heat dissipation is conducted by conducting heat.

前記のように、発熱体となるリレーやヒューズ等の電気部品や、トランジスタなどの電子部品を搭載し、電源用回路を備えたプリント基板の熱を車両ボデイに放熱するために、本発明では車両ボデイから突設した金属棒を利用している。したがって、従来のように電気接続箱内に放熱のための別部材を取り付けることなくシンプルな構造で放熱効果を高めることができ、車両ボデイに電気接続箱を固定した際の電気接続箱の安定性も同時に高めることができる。
具体的には、前記のように、車両ボデイから突出させてケースの貫通穴を通した前記金属棒を、貫通穴と同一軸線上のプリント基板の取付穴に挿通するだけで、前記プリント基板の熱を前記金属棒を介して車両ボデイに放熱することができ、特に、プリント基板の取付穴に前記金属棒を挿通させる際、前記金属棒の外周面の少なくとも一部をプリント基板の取付穴に接触させているので、基板の熱が効率的に金属棒に伝導され、車両ボデイへの放熱効果を高めることができる。 As described above, in the present invention, in order to dissipate heat of a printed circuit board having a power supply circuit mounted on an electric component such as a relay and a fuse serving as a heating element and an electronic component such as a transistor, A metal bar protruding from the body is used. Therefore, the heat dissipation effect can be enhanced with a simple structure without attaching a separate member for heat dissipation in the electrical junction box as in the past, and the stability of the electrical junction box when the electrical junction box is fixed to the vehicle body Can also be increased at the same time.
Specifically, as described above, the metal rod that protrudes from the vehicle body and passes through the through hole of the case is simply inserted into the mounting hole of the printed board on the same axis as the through hole. Heat can be dissipated to the vehicle body via the metal rod. In particular, when the metal rod is inserted through the mounting hole of the printed board, at least a part of the outer peripheral surface of the metal bar is used as the mounting hole of the printed board. Since they are in contact with each other, the heat of the substrate is efficiently conducted to the metal rod, and the heat dissipation effect to the vehicle body can be enhanced.

前記電気接続箱のケースに設ける貫通穴は前記金属棒を遊挿する大きさとする一方、前記プリント基板の取付穴は貫通穴とすると共に前記金属棒の外周面と接触する大きさとし、前記ケースの貫通穴の内周面より前記プリント基板の取付穴に向けて縮径するガイド筒を突設していることが好ましい。   The through hole provided in the case of the electrical junction box is sized to loosely insert the metal rod, while the mounting hole of the printed circuit board is a through hole and sized to contact the outer peripheral surface of the metal rod, It is preferable to project a guide cylinder having a diameter reduced from the inner peripheral surface of the through hole toward the mounting hole of the printed circuit board.

前記のように、ケースに設ける貫通穴を金属棒を遊挿できる大きさとし、ケースの貫通穴の内周面よりプリント基板の取付穴に向けて縮径するガイド筒を突設しておくことにより、金属棒の前記貫通穴、取付穴への挿通作業を容易化することができる。即ち、金属棒をケースの貫通穴に若干の余裕を持たせて挿通しても、該金属棒はガイド筒によりプリント基板の取付穴へと誘導され、おのずと取付穴に挿通されることとなる。また、プリント基板の取付穴は金属棒の外周面と接触する大きさとしているため、取付穴に挿通した金属棒の外周面が常に取付穴に接触した状態となり、プリント基板の熱を金属棒に効率よく伝導させることができる。   As described above, the through hole provided in the case is sized so that the metal rod can be loosely inserted, and the guide cylinder that is reduced in diameter from the inner peripheral surface of the through hole of the case toward the mounting hole of the printed circuit board is provided. Further, it is possible to facilitate the operation of inserting the metal rod into the through hole and the mounting hole. That is, even if the metal bar is inserted through the through hole of the case with a slight margin, the metal bar is guided to the mounting hole of the printed board by the guide tube and is naturally inserted into the mounting hole. Also, since the mounting hole of the printed circuit board is sized to contact the outer peripheral surface of the metal bar, the outer peripheral surface of the metal bar inserted through the mounting hole is always in contact with the mounting hole, and the heat of the printed circuit board is transferred to the metal bar. It is possible to conduct efficiently.

前記車両ボデイから突設する金属棒は、電気接続箱固定用と兼用したスタッドボルトとし、前記電気接続箱の貫通穴を設けたケースの一側外壁と対向する他側外壁にも貫通穴を設け、
前記スタッドボルトをケースの一側外壁の貫通穴から前記プリント基板の取付穴を通して、ケースの他側外壁の貫通穴に通し、該スタットボルトの突出部にナットで締め付けて、電気接続箱を車体ボデイに締結固定していることが好ましい。 The metal rod projecting from the vehicle body is a stud bolt that is also used for fixing the electrical junction box, and a through hole is also provided on the other outer wall facing the one outer wall of the case provided with the through hole of the electrical junction box. ,
The stud bolt is passed from the through hole in the outer wall on one side of the case, through the mounting hole on the printed circuit board, through the through hole in the outer wall on the other side of the case, and tightened with a nut to the protruding portion of the stud bolt. It is preferable to fasten and fix to.

さらに、前記のように、車両ボデイから突設する金属棒を電気接続箱固定用と兼用したスタッドボルトとしてケース他側外壁の貫通穴にも挿通し、突出部をナットで締め付けることにより、電気接続箱を車体ボデイに締結固定することが可能となる。よって、従来、電気接続箱に設けられていたブラケット等の車体固定用部材をなくして、電気接続箱の部品点数を削減することも可能となる。   Furthermore, as described above, the metal rod protruding from the vehicle body is inserted into the through hole in the outer wall of the other side of the case as a stud bolt that is also used for fixing the electrical connection box, and the projecting portion is tightened with a nut to make electrical connection. The box can be fastened and fixed to the vehicle body. Therefore, it is possible to reduce the number of parts of the electric connection box by eliminating the body fixing member such as a bracket conventionally provided in the electric connection box.

金属棒を電気接続箱固定用と兼用したスタッドボルトとする場合には、該スタッドボルトの材質を鉄鋼製として高い強度を保持させることが好ましい。
一方、金属棒を電気接続箱固定用と兼用せず、ブラケットなどの固定用部材を別途設けている場合には、プリント基板の取付穴を挿通した金属棒をケース内部で終端させてもよく、金属棒を熱伝導率の高いアルミニウム製としてもよい。 When a metal rod is used as a stud bolt that is also used for fixing an electric junction box, it is preferable that the material of the stud bolt is made of steel to maintain high strength.
On the other hand, if the metal rod is not used for fixing the electrical junction box and a fixing member such as a bracket is provided separately, the metal rod inserted through the mounting hole of the printed circuit board may be terminated inside the case. The metal rod may be made of aluminum having high thermal conductivity.

前記プリント基板に設けた取付穴の内周面に、金属層を設け、または金属管を取り付けており、該金属層または金属管を前記金属棒と接触させていることが好ましい。   It is preferable that a metal layer is provided or a metal tube is attached to an inner peripheral surface of an attachment hole provided in the printed board, and the metal layer or the metal tube is in contact with the metal rod.

前記構成によれば、内周面に金属層または金属管を取り付けたプリント基板の取付穴に前記金属棒を圧入することで、金属棒を前記金属層または金属管に密着させることができる。よって、プリント基板の熱をより効率的に金属棒に伝導させ、車両ボデイへの放熱効果を高めることができる。   According to the above configuration, the metal rod can be brought into close contact with the metal layer or the metal tube by press-fitting the metal rod into the mounting hole of the printed board having the metal layer or the metal tube attached to the inner peripheral surface. Therefore, the heat of the printed circuit board can be more efficiently conducted to the metal rod, and the heat dissipation effect to the vehicle body can be enhanced.

また、前記プリント基板に設けた取付穴の内周面または該取付穴の金属棒挿入側の周縁外面に、挿入側を広げた金属製バネ材を取り付けることも好ましい。   Moreover, it is also preferable to attach a metal spring material with the insertion side widened to the inner peripheral surface of the attachment hole provided in the printed circuit board or the outer peripheral surface of the attachment hole on the metal rod insertion side.

前記構成によれば、取付穴の内周面または金属棒挿入側の周縁外面に取り付けた金属製バネ材間の隙間に前記金属棒を挿入することで、前記バネ材の反発力が作用して金属棒と前記バネ材とを密着させることができる。よって、プリント基板の熱をより効率的に金属棒に伝導させることができ、車両ボデイへの放熱効果を高めることができる。
金属製バネ材は、例えば、一端が取付穴の内周面または金属棒挿入側の周縁外面に固定される一方、他端は固定されずに自由端とされ、形状は、金属棒挿入側を広げ、取付穴内部で内方に撓ませた断面円弧形状としていることが好ましい。 According to the above configuration, the repulsive force of the spring material acts by inserting the metal rod into the gap between the metal spring materials attached to the inner peripheral surface of the mounting hole or the outer peripheral surface of the metal rod insertion side. The metal rod and the spring material can be brought into close contact with each other. Therefore, the heat of the printed circuit board can be more efficiently conducted to the metal rod, and the heat dissipation effect to the vehicle body can be enhanced.
For example, one end of the metal spring material is fixed to the inner peripheral surface of the mounting hole or the outer peripheral surface of the metal rod insertion side, while the other end is not fixed and is a free end. It is preferable that the cross-sectional arc shape is widened and bent inward in the mounting hole.

前記プリント基板に設けた取付穴の周縁に、プリント基板上のアース回路の導体が位置し、前記金属棒を介して前記車両ボデイとアース接続していることが好ましい。   It is preferable that a conductor of an earth circuit on the printed circuit board is located at the periphery of the mounting hole provided in the printed circuit board and is connected to the vehicle body via the metal rod.

前記構成によれば、放熱用の前記金属棒を車両ボデイとのアース接続にも利用することで、アース線などの接続部材が不要となり、部品点数を削減することができる。   According to the said structure, by using the said metal bar | burr for thermal radiation also for earth | ground connection with a vehicle body, connection members, such as an earth wire, become unnecessary, and a number of parts can be reduced.

前述したように、車両ボデイから突設した金属棒をケースの貫通穴に通し、さらに同一軸線上のプリント基板の取付穴に貫通させるだけのシンプルな構造で、発熱体となる部品が搭載され電源用回路を備えたプリント基板の熱を、金属棒を介して車両ボデイに放熱することができる。特に、プリント基板の取付穴に前記金属棒を挿通させる際、前記金属棒の外周面の少なくとも一部をプリント基板の取付穴に接触させることにより、プリント基板の熱が効率的に金属棒に伝導され、よって車両ボデイへの放熱効果も高めることができる。   As mentioned above, a simple structure in which a metal rod protruding from the vehicle body is passed through the through hole of the case and further through the mounting hole of the printed circuit board on the same axis, with the parts that become the heating element mounted and the power supply The heat of the printed circuit board provided with the circuit for use can be radiated to the vehicle body through the metal rod. In particular, when the metal rod is inserted into the mounting hole of the printed board, the heat of the printed board is efficiently conducted to the metal rod by bringing at least a part of the outer peripheral surface of the metal rod into contact with the mounting hole of the printed board. Therefore, the heat dissipation effect to the vehicle body can be enhanced.

また、前記のように、ケースに設ける貫通穴を金属棒を遊挿する大きさとする一方、プリント基板の取付穴を金属棒の外周面と接触する大きさとし、さらに、ケースの貫通穴の内周面よりプリント基板の取付穴に向けて縮径するガイド筒を突設しておくことにより、金属棒の前記貫通穴、取付穴への挿通作業を容易化しつつ、取付穴に挿通した金属棒の外周面を取付穴に常に接触させた状態とすることができる。   Further, as described above, the through hole provided in the case is sized to loosely insert the metal rod, while the mounting hole of the printed circuit board is sized to contact the outer peripheral surface of the metal rod, and the inner periphery of the through hole of the case By projecting a guide cylinder that reduces the diameter from the surface toward the mounting hole of the printed circuit board, the metal rod inserted into the mounting hole can be easily inserted into the through hole and the mounting hole. The outer peripheral surface can always be in contact with the mounting hole.

さらに、前記のように、車両ボデイから突設する金属棒を電気接続箱固定用と兼用したスタッドボルトとすることにより、従来、電気接続箱に設けられていたブラケット等の車体固定用部材をなくして、電気接続箱の部品点数を削減することも可能となる。   Further, as described above, the metal rod protruding from the vehicle body is used as a stud bolt that also serves as an electric junction box fixing member, thereby eliminating the body fixing member such as a bracket conventionally provided in the electric junction box. Thus, it is possible to reduce the number of parts of the electrical junction box.

また、前記のように、プリント基板に設けた取付穴の内周面に金属層または金属管を取り付けたり、該取付穴の内周面または取付穴の金属棒挿入側の周縁外面に挿入側を広げた金属製バネ材を取り付けたりすることにより、前記金属棒と取付穴の金属層、金属管または金属製バネ材とを密着させてプリント基板の熱をより効率的に金属棒に伝導させることができる。   In addition, as described above, a metal layer or a metal tube is attached to the inner peripheral surface of the mounting hole provided in the printed circuit board, or the insertion side is connected to the inner peripheral surface of the mounting hole or the outer peripheral edge of the mounting hole on the metal rod insertion side. By attaching an expanded metal spring material, the metal rod and the metal layer of the mounting hole, the metal tube or the metal spring material are brought into close contact with each other, and the heat of the printed circuit board is more efficiently conducted to the metal rod. Can do.

さらに、前記のように、プリント基板の取付穴の周縁に、プリント基板上のアース回路の導体を位置させることにより、前記金属棒を介して放熱とアース接続の両方を行うことができる。よって、アース線などの接続部材が不要となり部品点数を削減することができる。   Further, as described above, by disposing the conductor of the ground circuit on the printed circuit board at the periphery of the mounting hole of the printed circuit board, both heat dissipation and ground connection can be performed via the metal rod. Therefore, a connection member such as a ground wire is not necessary, and the number of parts can be reduced.

以下、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４は第１実施形態を示している。第１実施形態の電気接続箱１０では、図１および図２に示すように、ロアケース１１およびアッパーケース１３からなるケースに電源用回路１４を備えたプリント基板１２を内蔵している。プリント基板１２には、発熱体となるリレー１５やヒューズ１６等の電気部品や、トランジスタ１７などの電子部品を実装している。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 4 show a first embodiment. In the electrical junction box 10 of the first embodiment, as shown in FIGS. 1 and 2, a printed circuit board 12 including a power supply circuit 14 is built in a case including a lower case 11 and an upper case 13. On the printed circuit board 12, electrical components such as a relay 15 and a fuse 16 serving as a heating element, and electronic components such as a transistor 17 are mounted.

発熱性の電気部品１５、１６や電子部品１７を実装したプリント基板１２の熱を車両ボデイ２０に放熱するために、電気接続箱１０を固定する車両ボデイ２０から金属棒２１を突設し、ロアケース１１の貫通穴１１ａ、プリント基板１２の取付穴１２ａ、さらにはアッパーケース１３の貫通穴１３ａに挿通させている。
本実施形態では、図２に示すように、電気接続箱１０の対向する短辺部１０A、１０Ｂが上下方向となるように車両ボデイ２０に固定するが、その際、電気接続箱１０の上辺部１０Ａが配置される車両ボデイ２０の所定位置（２箇所）に、金属棒２１を溶接固定して金属棒２１を垂直方向に突出させている。金属棒２１としては、先端部２１ａにナット２２を取り付けるネジ溝を形成した鉄鋼製のスタッドボルトを用い、アッパーケース１３の貫通穴１３ａを通して電気接続箱１０の外部に突出させたスタッドボルト２１の突出部（先端部２１ａ）をナット２２で締め付けて、電気接続箱１０を車両ボデイ２０に締結固定している。即ち、金属棒２１をプリント基板１２の放熱と電気接続箱１０の固定とに兼用している。 In order to dissipate the heat of the printed circuit board 12 mounted with the heat-generating electrical components 15 and 16 and the electronic component 17 to the vehicle body 20, a metal rod 21 is projected from the vehicle body 20 to which the electrical connection box 10 is fixed, and the lower case 11 through holes 11 a, the mounting holes 12 a in the printed circuit board 12, and the through holes 13 a in the upper case 13.
In this embodiment, as shown in FIG. 2, the short sides 10 </ b> A and 10 </ b> B of the electric junction box 10 are fixed to the vehicle body 20 so as to be in the vertical direction. A metal rod 21 is fixed by welding to a predetermined position (two locations) of the vehicle body 20 on which 10A is disposed to project the metal rod 21 in the vertical direction. As the metal rod 21, a steel stud bolt in which a screw groove for attaching the nut 22 is formed at the tip end portion 21a is used, and the stud bolt 21 protruding outside the electrical connection box 10 through the through hole 13a of the upper case 13 is used. The electric connection box 10 is fastened and fixed to the vehicle body 20 by tightening the portion (tip portion 21 a) with a nut 22. That is, the metal rod 21 is used for both heat radiation of the printed circuit board 12 and fixing of the electrical junction box 10.

具体的には、電気接続箱１０のロアケース１１には、金属棒２１を挿通する貫通穴１１ａを設けていると共に、内蔵するプリント基板１２には、貫通穴１１ａと同一軸線上の位置に金属棒２１を挿通する取付穴１２ａを設けている。さらに、アッパーケース１３にも、貫通穴１１ａ、取付穴１２ａと同一軸線上の位置に、金属棒２１を挿通する貫通穴１３ａを設けている。
ロアケース１１に設ける貫通穴１１ａは、金属棒２１を遊挿できる大きさとしている一方、プリント基板１２に設ける取付穴１２ａは、金属棒２１の外周面が接触できる大きさとし、ロアケース１１には、貫通穴１１ａの内周面よりプリント基板１２の取付穴１２ａに向けて縮径するガイド筒１１ｂを設けている。
また、アッパーケース１３に設ける貫通穴１３ａは、ロアケース１１の貫通穴１１ａと同様、金属棒２１を遊挿できる大きさとしている。 Specifically, the lower case 11 of the electrical junction box 10 is provided with a through hole 11a through which the metal bar 21 is inserted, and the built-in printed circuit board 12 has a metal bar at a position on the same axis as the through hole 11a. A mounting hole 12 a through which 21 is inserted is provided. Further, the upper case 13 is also provided with a through hole 13a through which the metal rod 21 is inserted at a position on the same axis as the through hole 11a and the mounting hole 12a.
The through hole 11a provided in the lower case 11 is sized so that the metal bar 21 can be loosely inserted, while the mounting hole 12a provided in the printed circuit board 12 is sized such that the outer peripheral surface of the metal bar 21 can contact the A guide cylinder 11b is provided which is reduced in diameter from the inner peripheral surface of the hole 11a toward the mounting hole 12a of the printed circuit board 12.
Further, the through hole 13 a provided in the upper case 13 has a size that allows the metal rod 21 to be loosely inserted, similarly to the through hole 11 a of the lower case 11.

さらに、プリント基板１２と金属棒２１との接触を強固にするために、図３に示すように、取付穴１２ａの内周面全体に金属管１８を取り付けている。金属管１８の厚みは、取付穴１２ａの内周面に金属管１８を取り付けた状態で、金属管１８の中空部分に金属棒２１を圧入できる程度としている。   Further, in order to strengthen the contact between the printed circuit board 12 and the metal rod 21, a metal tube 18 is attached to the entire inner peripheral surface of the attachment hole 12a as shown in FIG. The thickness of the metal tube 18 is such that the metal rod 21 can be press-fitted into the hollow portion of the metal tube 18 with the metal tube 18 attached to the inner peripheral surface of the attachment hole 12a.

また、プリント基板１２の取付穴１２ａの周縁には、図４に示すように、アース回路の導体１４ａを位置させることもでき、これにより金属棒２１を介してプリント基板１２の放熱とアース接続の両方を行うことができる。   Further, as shown in FIG. 4, a conductor 14 a of an earth circuit can also be positioned on the periphery of the mounting hole 12 a of the printed circuit board 12, whereby the heat radiation and ground connection of the printed circuit board 12 can be performed via the metal rod 21. You can do both.

前記のように、車両ボデイ２０から突設した金属棒２１をロアケース１１の貫通穴１１ａに通し、さらに同一軸線上のプリント基板１２の取付穴１２ａに貫通させるだけのシンプルな構造で、発熱体となる部品１５、１６、１７が搭載され電源用回路１４を備えたプリント基板１２の熱を、金属棒２１を介して車両ボデイ２０に放熱することができる。   As described above, the metal rod 21 protruding from the vehicle body 20 is passed through the through hole 11a of the lower case 11 and further passed through the mounting hole 12a of the printed circuit board 12 on the same axis. The heat of the printed circuit board 12 equipped with the components 15, 16, and 17 and having the power supply circuit 14 can be dissipated to the vehicle body 20 through the metal rod 21.

また、前記のように、ロアケース１１に設ける貫通穴１１ａを、金属棒２１を遊挿できる大きさとする一方、プリント基板１２の取付穴１２ａを、金属棒２１の外周面と接触できる大きさとし、さらに、ロアケース１１の貫通穴１１ａの内周面よりプリント基板１２の取付穴１２ａに向けて縮径するガイド筒１１ｂを突設しておくことにより、貫通穴１１ａ、取付穴１２ａへの金属棒２１の挿通作業を容易化することができ、かつ取付穴１２ａに挿通した金属棒２１の外周面を取付穴１２ａに常に接触させてプリント基板１２の熱を効率的に金属棒２１に伝導することができる。   In addition, as described above, the through hole 11a provided in the lower case 11 is sized so that the metal rod 21 can be loosely inserted, while the mounting hole 12a of the printed circuit board 12 is sized to contact the outer peripheral surface of the metal rod 21, and By projecting a guide cylinder 11b having a reduced diameter from the inner peripheral surface of the through hole 11a of the lower case 11 toward the mounting hole 12a of the printed circuit board 12, the through hole 11a and the metal rod 21 to the mounting hole 12a are projected. The insertion operation can be facilitated, and the outer peripheral surface of the metal bar 21 inserted through the mounting hole 12a can always be brought into contact with the mounting hole 12a to efficiently conduct the heat of the printed circuit board 12 to the metal bar 21. .

特に、前記のように、プリント基板１２の取付穴１２ａの内周面に金属管１８を取り付け、金属棒２１を金属管１８の中空部分に圧入していくことによって、金属棒２１と金属管１８とを密着させることができる。よって、プリント基板１２の熱を一層効率的に金属棒２１に伝導させ、車両ボデイ２０への放熱効果も高めることができる。   In particular, as described above, the metal tube 18 is attached to the inner peripheral surface of the mounting hole 12 a of the printed circuit board 12, and the metal rod 21 is press-fitted into the hollow portion of the metal tube 18. Can be brought into close contact with each other. Therefore, the heat of the printed circuit board 12 can be more efficiently conducted to the metal rod 21 and the heat dissipation effect to the vehicle body 20 can be enhanced.

また、前記のように、車両ボデイ２０から突設する金属棒２１を電気接続箱固定用と兼用したスタッドボルトとし、ロアケース１１の貫通穴１１ａ、プリント基板１２の取付穴１２ａ、アッパーケース１３の貫通穴１３ａを貫通させて突出部２１ａをナット２２で締め付けることにより、電気接続箱１０の車体ボデイ２０への締結固定も可能となる。よって、従来、電気接続箱１０に設けられていたブラケット等の車体固定用部材をなくして、電気接続箱１０の部品点数を削減することができる。   Further, as described above, the metal rod 21 protruding from the vehicle body 20 is used as a stud bolt that is also used for fixing the electric junction box, and the through hole 11a of the lower case 11, the mounting hole 12a of the printed circuit board 12, and the upper case 13 are penetrated. By fastening the protrusion 21a with the nut 22 through the hole 13a, the electric connection box 10 can be fastened and fixed to the vehicle body 20 as well. Therefore, the number of parts of the electrical junction box 10 can be reduced by eliminating the body fixing member such as a bracket conventionally provided in the electrical junction box 10.

さらに、前記のように、プリント基板１２の取付穴１２ａの周縁に、プリント基板１２上のアース回路の導体１４ａを位置させることにより、金属棒２１を介して放熱とアース接続の両方を行うことができる。よって、アース線などの接続部材が不要となり部品点数を削減することができる。   Furthermore, as described above, by disposing the conductor 14a of the ground circuit on the printed circuit board 12 around the mounting hole 12a of the printed circuit board 12, both heat dissipation and ground connection can be performed via the metal rod 21. it can. Therefore, a connection member such as a ground wire is not necessary, and the number of parts can be reduced.

なお、第１実施形態では、プリント基板１２の取付穴１２ａの内周面全体に金属管１８を取り付けているが、その他、リブ状の金属層をプリント基板の取付穴の内周面に取り付けても同様の効果が得られる。   In the first embodiment, the metal tube 18 is attached to the entire inner peripheral surface of the mounting hole 12a of the printed circuit board 12, but in addition, a rib-shaped metal layer is attached to the inner peripheral surface of the mounting hole of the printed circuit board. The same effect can be obtained.

図５に第２実施形態を示す。第２実施形態では、金属棒２１を電気接続箱固定用とせず、電気接続箱１０に固定用のブラケット１９を別途設けてボルトで締結固定している。したがって、アッパーケース１３には貫通穴を設けず、プリント基板１２の取付穴１２ａを挿通した金属棒２１をケース内部で終端させている。その他の点は第１実施形態と同様としている。   FIG. 5 shows a second embodiment. In the second embodiment, the metal rod 21 is not used for fixing the electric junction box, and a fixing bracket 19 is separately provided in the electric junction box 10 and fastened and fixed with bolts. Accordingly, the upper case 13 is not provided with a through hole, and the metal rod 21 inserted through the mounting hole 12a of the printed circuit board 12 is terminated inside the case. Other points are the same as in the first embodiment.

第２実施形態においても、第１実施形態と同様に、シンプルな構造で、発熱体となる部品１５、１６、１７が搭載され電源用回路１４を備えたプリント基板１２の熱を金属棒を介して車両ボデイ２０に効率的に放熱することができる。   Also in the second embodiment, similar to the first embodiment, the heat of the printed circuit board 12 having the power supply circuit 14 mounted with the components 15, 16, and 17 having a simple structure and a heating element is passed through the metal rod. Thus, heat can be efficiently radiated to the vehicle body 20.

図６は第３実施形態を示す。第３実施形態では、プリント基板１２の取付穴１２ａの内周面に取り付けた金属管１８の代わりとして、取付穴１２ａの金属棒挿入側の周縁外面に、挿入側を広げた金属製バネ材２８を取り付けている点以外は第１実施形態と同様としている。金属製バネ材２８は、図６に示すように、一端が取付穴１２ａの金属棒挿入側の周縁外面に固定される一方、他端は固定されずに自由端とされ、形状は、金属棒挿入側を広げ、取付穴１２ａ内部で内方に撓ませた断面円弧形状としている。   FIG. 6 shows a third embodiment. In the third embodiment, instead of the metal tube 18 attached to the inner peripheral surface of the attachment hole 12a of the printed circuit board 12, a metal spring material 28 having an insertion side widened on the outer peripheral edge of the attachment hole 12a on the metal rod insertion side. It is the same as that of 1st Embodiment except the point which has attached. As shown in FIG. 6, the metal spring member 28 has one end fixed to the outer peripheral surface of the mounting hole 12a on the metal rod insertion side, while the other end is not fixed and is a free end, and the shape is a metal rod. The insertion side is widened, and the cross-sectional arc shape is inwardly bent inside the mounting hole 12a.

第３実施形態によれば、取付穴１２ａの金属棒挿入側の周縁外面に取り付けた金属製バネ材２８間の隙間に金属棒２１を挿入することで、バネ材２８の反発力が作用して金属棒２１とバネ材２８とを密着させることができる。よって、プリント基板１２の熱をより効率的に金属棒２１に伝導させることができ、車両ボデイ２０への放熱効果を高めることができる。   According to the third embodiment, the repulsive force of the spring material 28 acts by inserting the metal rod 21 into the gap between the metal spring materials 28 attached to the outer peripheral surface of the mounting hole 12a on the metal rod insertion side. The metal bar 21 and the spring material 28 can be brought into close contact with each other. Therefore, the heat of the printed circuit board 12 can be more efficiently conducted to the metal rod 21 and the heat dissipation effect to the vehicle body 20 can be enhanced.

なお、第３実施形態では、金属製バネ材２８を取付穴１２ａの金属棒挿入側の周縁外面に取り付けているが、図7に示すように取付穴１２ａの内周面に金属製バネ材２８を取り付けても同様の効果が得られる。   In the third embodiment, the metal spring material 28 is attached to the outer peripheral surface of the attachment hole 12a on the metal rod insertion side. However, as shown in FIG. 7, the metal spring material 28 is attached to the inner peripheral surface of the attachment hole 12a. The same effect can be obtained even if attached.

第１実施形態の電気接続箱の放熱構造を示す分解斜視図である。It is a disassembled perspective view which shows the thermal radiation structure of the electrical junction box of 1st Embodiment. 電気接続箱の放熱構造を示す断面図である。It is sectional drawing which shows the thermal radiation structure of an electrical junction box. プリント基板の取付穴を示し、（Ａ）は平面図、（Ｂ）は断面図である。The attachment hole of a printed circuit board is shown, (A) is a top view, (B) is sectional drawing. プリント基板の取付穴周辺の斜視図である。It is a perspective view around the attachment hole of a printed circuit board. 第２実施形態の電気接続箱の放熱構造を示す断面図である。It is sectional drawing which shows the thermal radiation structure of the electrical junction box of 2nd Embodiment. 第３実施形態におけるプリント基板の取付穴を示す断面図である。It is sectional drawing which shows the attachment hole of the printed circuit board in 3rd Embodiment. プリント基板の取付穴の別の例を示す断面図である。It is sectional drawing which shows another example of the attachment hole of a printed circuit board. 従来例を示す図面である。It is drawing which shows a prior art example.

符号の説明Explanation of symbols

１０ 電気接続箱
１１ ロアケース
１１ａ 貫通穴
１１ｂ ガイド筒
１２ プリント基板
１２ａ 取付穴
１８ 金属管
２８ 金属製バネ材
１３ アッパーケース
１３ａ 貫通穴
１４ 電源用回路
１５ リレー
１６ ヒューズ
１７ トランジスタ
１９ ブラケット
２０ 車両ボデイ
２１ 金属棒
２２ ナット DESCRIPTION OF SYMBOLS 10 Electrical connection box 11 Lower case 11a Through hole 11b Guide cylinder 12 Printed circuit board
12a Mounting hole 18 Metal tube 28 Metal spring material 13 Upper case 13a Through hole 14 Power circuit 15 Relay 16 Fuse 17 Transistor 19 Bracket 20 Vehicle body 21 Metal rod 22 Nut

Claims (6)

発熱体となる電気部品および電子部品を搭載していると共に電源用回路を備えたプリント基板を内蔵した電気接続箱の放熱構造であって、
前記電気接続箱を固定する車両ボデイから金属棒を突設する一方、
前記電気接続箱のケースに金属棒を挿通する貫通穴および、該貫通穴と同一軸線上に設けた取付穴を前記プリント基板に設け、
前記金属棒を前記ケースの貫通穴を通して前記プリント基板の取付穴に挿通し、該金属棒の外周面の少なくとも一部を前記取付穴と接触させ、該金属棒を介して前記車両ボデイにプリント基板の熱を伝導して放熱していることを特徴とする電気接続箱の放熱構造。 It is a heat dissipation structure for an electrical junction box that is equipped with a printed circuit board that is equipped with an electrical component and an electronic component that serve as a heating element and that has a power supply circuit,
While projecting a metal rod from the vehicle body that fixes the electrical junction box,
A through hole for inserting a metal rod into the case of the electrical connection box, and a mounting hole provided on the same axis as the through hole are provided in the printed circuit board,
The metal rod is inserted into the mounting hole of the printed board through the through hole of the case, at least a part of the outer peripheral surface of the metal bar is brought into contact with the mounting hole, and the printed board is attached to the vehicle body via the metal rod. The heat dissipation structure of the electrical junction box is characterized in that it conducts and dissipates heat. 前記電気接続箱のケースに設ける貫通穴は前記金属棒を遊挿する大きさとする一方、前記プリント基板の取付穴は貫通穴とすると共に前記金属棒の外周面と接触する大きさとし、前記ケースの貫通穴の内周面より前記プリント基板の取付穴に向けて縮径するガイド筒を突設している請求項１に記載の電気接続箱の放熱構造。   The through hole provided in the case of the electrical junction box is sized to loosely insert the metal rod, while the mounting hole of the printed circuit board is a through hole and sized to contact the outer peripheral surface of the metal rod, The heat dissipation structure for an electrical junction box according to claim 1, wherein a guide tube having a diameter reduced from the inner peripheral surface of the through hole toward the mounting hole of the printed circuit board is provided. 前記車両ボデイから突設する金属棒は、電気接続箱固定用と兼用したスタッドボルトとし、前記電気接続箱の貫通穴を設けたケースの一側外壁と対向する他側外壁にも貫通穴を設け、
前記スタッドボルトをケースの一側外壁の貫通穴から前記プリント基板の取付穴を通して、ケースの他側外壁の貫通穴に通し、該スタットボルトの突出部にナットで締め付けて、電気接続箱を車体ボデイに締結固定している請求項１又は請求項２に記載の電気接続箱の放熱構造。 The metal rod projecting from the vehicle body is a stud bolt that is also used for fixing the electrical junction box, and a through hole is also provided on the other outer wall facing the one outer wall of the case provided with the through hole of the electrical junction box. ,
The stud bolt is passed from the through hole in the outer wall on one side of the case, through the mounting hole on the printed circuit board, through the through hole in the outer wall on the other side of the case, and tightened with a nut to the protruding portion of the stud bolt. The heat dissipation structure for an electrical junction box according to claim 1 or 2, wherein the structure is fastened and fixed to the electrical connection box. 前記プリント基板に設けた取付穴の内周面に、金属層を設け、または金属管を取り付けており、該金属層または金属管を前記金属棒と接触させている請求項１乃至請求項３のいずれか１項に記載の電気接続箱の放熱構造。   The metal layer is provided in the inner peripheral surface of the attachment hole provided in the said printed circuit board, or the metal pipe is attached, The metal layer or the metal pipe is made to contact the said metal rod. The heat dissipation structure of the electrical junction box of any one of Claims 1. 前記プリント基板に設けた取付穴の内周面または該取付穴の金属棒挿入側の周縁外面に、挿入側を広げた金属製バネ材を取り付けている請求項１乃至請求項３のいずれか１項に記載の電気接続箱の放熱構造。   4. A metal spring material having an insertion side widened is attached to an inner peripheral surface of an attachment hole provided in the printed circuit board or an outer peripheral surface of the attachment hole on a metal rod insertion side. The heat dissipation structure of the electrical junction box described in the paragraph. 前記プリント基板に設けた取付穴の周縁に、プリント基板上のアース回路の導体が位置し、前記金属棒を介して前記車両ボデイとアース接続している請求項１乃至請求項５のいずれか１項に記載の電気接続箱の放熱構造。   The conductor of the earth circuit on a printed circuit board is located in the peripheral edge of the attachment hole provided in the said printed circuit board, and is connected to the said vehicle body through the said metal rod, Any one of Claim 1 thru | or 5 The heat dissipation structure of the electrical junction box described in the paragraph.

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