JP2006254528A - Electric connection box for automobile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce an electric connection box in size in a horizontal direction by arranging a printed board and an insulating plate mounted with a bus bar in a case of the electric connection box so as to vertically oppose each other. <P>SOLUTION: The printed board and the insulating plate mounted with the bus bar are arranged at both right and left ends in the case so as to vertically oppose each other with a heat radiating intermediate space between, an intermediate case wherein a pair of upper and lower support frames in the horizontal direction and a vertical frame part that connects the upper and lower support frames are integrally molded is arranged in the heat radiating intermediate space, protrusions formed at the upper and lower support frames of the intermediate case are made to penetrate installation holes formed at the printed board and the insulating plate so as to be protruded, the protrusions are thermally welded to the printed board and the insulating plate, a board relay mounted on the printed board is arranged in the heat radiating intermediate space, a relay connecting terminal protruded from the bus bar is inserted into a relay installation part formed at the vertical frame part of the intermediate case, and a plug-in relay is fitted to the relay installation part and arranged in the heat radiating intermediate space. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an electrical junction box, and more specifically, in an electrical junction box including a printed circuit board on which a board relay is mounted and a bus bar connected to the relay, the layout of components in the electrical junction box is improved, and the size is reduced. It is intended to improve the efficiency, heat dissipation and assembly.

In recent years, with the increase in functionality of automobiles, the number of in-vehicle electrical components has increased rapidly, and the number of electrical circuit systems in the vehicle has increased. Therefore, the density and size of the electrical junction box has been increased.
Corresponding to such a situation, a power distributor (PD) in which a board relay such as a semiconductor switching element (FET) or an SMD relay is mounted on a printed board, and a bus bar and a heat sink are attached to the other side of the printed board. Is incorporated into an electrical junction box.

  For example, in Japanese Patent Application Laid-Open No. 2001-319708, as shown in FIG. 7, a semiconductor switching element (FET) 3 is arranged on a printed circuit board with a bus bar fixed on the back surface, and an FET 3 requiring a large current is arranged. An electrical junction box 1 is disclosed that is connected to a bus bar and incorporates a power distributor PD2 having a heat radiating member 4 attached to the bus bar and a branch circuit block 5 made of a laminate of the bus bar and an insulating plate. A connector housing 7 for fitting a connector of a wire harness (not shown) arranged in the vehicle is provided on the lower surface side of the case 6 of the electrical junction box 1, and a fuse is disposed on the upper surface side of the case 6. A mounting portion 8 is provided and connected to the branch circuit block 5 in a circuit.

In the electrical connection box 1, since the PDs 2 are simply arranged side by side on the side of the branch circuit block 5, the electrical connection box 1 is also increased in size in the horizontal direction by the area of the PD 2, and the occupied space when mounted on the vehicle There is a problem that becomes large.
There is also provided an electrical junction box in which the stacked body is arranged in the horizontal direction and the PD is arranged in the vertical direction to minimize the increase in size in the horizontal direction. There is a problem that the electric junction box is enlarged in the vertical direction, and as a result, is enlarged in both the horizontal direction and the vertical direction.

  Further, as described above, when the PD on which the board relay is mounted and the block in which the bus bar on which the relay is fitted are stacked on the insulating plate are accommodated in the electrical junction box, the PD is fitted on the board relay and the bus bar. Depending on the arrangement position of the relay (plug-in relay), heat is trapped inside the electric junction box, and it is necessary to consider heat dissipation.

JP 2001-319708 A

  The present invention has been made in view of the above problems, and in an electrical junction box that accommodates a PD having a printed board on which a board relay is mounted and a bus bar that is fitted and connected to the relay, the PD and the bus bar It is an object to improve the arrangement position to reduce the size of the electrical junction box and improve heat dissipation.

In order to solve the above-mentioned problem, as a first invention, a printed circuit board and an insulating plate on which a bus bar is mounted are vertically opened with an intermediate space for heat dissipation at left and right ends inside a case constituted by an upper case and a lower case. And an intermediate case in which a pair of upper and lower horizontal support frames and one vertical frame portion connecting the upper and lower support frames are integrally formed are disposed in the intermediate space for heat dissipation.
Protrusions provided on the upper and lower support frames of the intermediate case are projected through mounting holes formed in the printed circuit board and the insulating plate, and the projecting parts are thermally welded to the printed circuit board and the insulating plate. ,
A board relay mounted on the printed circuit board is disposed in the intermediate space for heat dissipation, and a relay connection terminal protruding from the bus bar is inserted into a relay mounting portion provided in a vertical frame portion of the intermediate case, and the relay A plug-in relay is fitted to the mounting portion and disposed in the intermediate space for heat dissipation,
In addition, a bus bar mounted on the insulating plate and a bus bar fixed to the printed circuit board are extended and bent, and an external terminal connection portion formed in the bent portion is attached to the upper case and the lower case. An electrical junction box for an automobile is provided, wherein the electrical connection box is inserted into the connector and the connector mounting portion.

According to the said structure, since the printed circuit board and the insulating board carrying a bus bar are opposingly arranged in the vertical direction inside the case of an electrical junction box, an electrical junction box can be reduced in size in a horizontal direction.
In addition, in the conventional electrical junction box, the insulating plate on which the bus bar is mounted is arranged in the horizontal direction, and the mounting portion of the relay connected to the tab provided on the bus bar is provided in the upper case or the lower case. The horizontal area was large. On the other hand, in the electrical junction box of the present invention, by disposing the insulating plate on which the bus bar is mounted in the vertical direction and providing the relay mounting portion in the vertical direction, no relay mounting portion is provided in the upper case or the lower case, or In addition, since the horizontal area of the upper case and the lower case is reduced by reducing the number of relay mounting portions, the electrical junction box can be further downsized in the horizontal direction.
In addition, since an intermediate case is disposed between the printed board and the bus bar mounting insulating plate opposed to each other in the vertical direction, and the intermediate case supports the printed board and the insulating plate, an intermediate space can be secured, the intermediate Board relays and plug-in relays can be efficiently arranged in the space. In addition, the upper case and the lower case provided with the fuse attachment part and the connector attachment part are arranged on the upper and lower ends of the printed board and the bus bar mounting insulating plate so as to surround the intermediate space. The layout can be improved and the enlargement of the electrical junction box can be suppressed.

In addition, the printed circuit board and the insulating plate on which the bus bar is mounted are not fixed to the intermediate case by screwing, but are fixed by heat welding. It is possible to prevent the occurrence of abnormal noise and to prevent the printed board, the insulating plate and the intermediate case from being disconnected. Moreover, since the screw is unnecessary, the number of parts can be reduced.
Specifically, the rib provided on the intermediate case is projected through the mounting hole formed in the printed circuit board and the insulating plate, and the protruding portion is melted by heating to increase the diameter. The formed protrusion is welded to the printed circuit board and the insulating plate.

As a second invention, a printed circuit board is disposed on one side of the left and right sides of the case constituted by an upper case and a lower case, and the printed circuit board side and the first heat radiation intermediate space are opened, and the left and right sides of the case An insulating plate with a bus bar is placed, opening the inner surface on the side and the intermediate space for second heat dissipation,
An intermediate case having a pair of upper and lower horizontal support frames is disposed in the first heat radiation intermediate space, and protrusions provided on the upper and lower support frames of the intermediate case are formed in the printed circuit board and the insulating plate. Is projected through the mounting hole, and the protruding portion is thermally welded to the printed circuit board and the insulating plate,
A board relay mounted on the printed circuit board is disposed in the first heat radiation intermediate space, and a relay connection terminal protruding from the bus bar is inserted into a relay mounting portion provided on a vertical frame protruding from the lower case A plug-in relay is fitted to the relay mounting portion and disposed in the second heat radiation intermediate space,
In addition, a bus bar mounted on the insulating plate and a bus bar fixed to the printed circuit board are extended and bent, and an external terminal connection portion formed in the bent portion is attached to the upper case and the lower case. An electrical junction box for automobiles is provided, wherein the electrical connection box is inserted into the connector, the connector mounting portion, and the power terminal mounting portion.

  In the second aspect of the invention, the board relay that is solder-fixed to the printed circuit board is accommodated in the first heat radiation intermediate space, while the plug-in relay that is connected to the bus bar is accommodated in the second heat radiation intermediate space, and is placed in different spaces. Further, since the plug-in relay protrudes from the insulating plate toward the outside of the case, heat generated from the plug-in relay can be efficiently radiated without being accumulated in the case.

In both of the electrical junction boxes of the first and second inventions, the printed circuit board is brought into contact with the inner surfaces of the peripheral walls of the upper case and the lower case, and the upper case and the lower case are used in combination with the heat dissipation material of the printed circuit board. It is preferable.
That is, when the bus bar is fixed to the outer surface side of the printed circuit board, the bus bar is brought into contact with the case, or when the bus bar is not fixed to the outer surface side of the printed circuit board, the substrate itself is brought into contact with the case. ing.
According to the above configuration, the heat generated from the printed circuit board can be transmitted to the upper case and the lower case and efficiently radiated to the outside of the case.
With such a configuration, in the conventional PD, a heat radiating plate made of a metal plate or a resin plate is brought into contact with the printed circuit board in order to enhance heat dissipation, but it is not necessary to provide a separate heat radiating plate, and the number of parts and cost can be reduced. .

As described above, according to the present invention, the printed circuit board and the insulating plate on which the bus bar is mounted are fixed to the intermediate case, and the hollow space is opened and opposed in the vertical direction. Because it can be used as an arrangement space for plug-in relays, and the fuse attachment and connector attachment are arranged on the upper and lower surfaces surrounding the intermediate space, it has a very efficient layout and suppresses the enlargement of the electrical junction box. it can.
Therefore, the space occupied when the electric junction box is mounted on the vehicle can be reduced, and the electric connection box can be mounted on a vehicle type in which space restrictions are severe.

  In addition, the printed circuit board and the insulation board mounted with the bus bar are not fixed to the intermediate case by screwing, but are fixed by thermal welding, so that even if the printed circuit board, the insulation board and the intermediate case are deformed by heating, rattling occurs. Can be prevented, the occurrence of abnormal noise can be prevented, and the connection between the printed board, the insulating plate and the intermediate case can be prevented from being released. Moreover, since the screw is unnecessary, the number of parts can be reduced.

  Furthermore, in the second invention, since the plug-in relay connected to the bus bar protrudes from the insulating plate toward the outside of the case, the heat generated from the plug-in relay is efficiently radiated without being trapped inside the case. can do.

Embodiments of the present invention will be described with reference to the drawings.
FIGS. 1 to 4 show a first embodiment of the present invention, and printed circuit boards 20 (in FIG. 2, right end in FIG. 2) are disposed at both left and right ends of a case constituted by an upper case 11 and a lower case 12 of an electric connection box 10. Part) and the insulating plate 30 (the left end part in FIG. 2) on which the bus bar 31 is mounted are disposed to face each other in the vertical direction with the intermediate space S for heat dissipation. In FIG. 1, a region Sa surrounded by a one-dot chain line indicates a placement region of the printed circuit board 20 and the board relay 50 mounted on the printed circuit board 20, and a region Sb surrounded by a two-dot chain line indicates the insulating plate 30 on which the bus bar 31 is mounted. The arrangement | positioning area | region of the plug-in relay 51 connected to the bus bar 31 is shown.
Although the upper cover 60 is put on the upper surface side of the upper case 11 and the lower cover 61 is put on the lower surface side of the lower case 12 and locked together, the upper cover 60 is not shown in FIG.

  An intermediate case 40 in which a pair of upper and lower horizontal support frames 41 and 42 and one vertical frame portion 43 connecting the upper and lower support frames 41 and 42 are integrally formed is disposed in the heat dissipation intermediate space S. Has been. The vertical frame portion 43 of the intermediate case 40 is provided on the side closer to the insulating plate 30 than the center inside the case (left side in FIG. 2), and the vertical frame portion 43 is provided with a plurality of relay mounting portions 44. Yes.

The support frames 41 and 42 of the intermediate case 40 extend in the horizontal direction from the printed circuit board 20 disposed at both left and right ends inside the case to the insulating plate 30, and both ends of the support frames 41 and 42 are insulated from the printed circuit board 20. It is heat welded to the plate 30.
Specifically, as shown in FIG. 4A, ribs 41a and 42a protruding from both ends of the support frames 41 and 42 are passed through the mounting holes 20a and 30a formed in the printed circuit board 20 and the insulating plate 30, respectively. As shown in FIG. 4B, the protrusions 41b and 42b are melted by heating to increase the diameter, and the increased diameter protrusions 41b and 42b are printed on the printed circuit board 20 as shown in FIG. And the mounting holes 20a and 30a of the insulating plate 30 are welded to the periphery. Note that the positions of the protrusions 41b and 42b are not limited to both ends of the support frames 41 and 42, and can be set at any location as long as they do not hinder circuit configuration or relay mounting.
In this way, the printed circuit board 20 and the insulating plate 30 are thermally welded to the intermediate case 40, whereby the printed circuit board 20 and the insulating plate 30 are held at predetermined positions inside the case by the intermediate case 40.

A printed conductor (not shown) is provided on the inner surface of the printed board 20 on the inner side of the case, and a bus bar 21 obtained by punching a conductive metal plate into a required shape is fixed to the outer surface.
The terminal of the board relay 50 is soldered to the conductor of the printed circuit board 20 or is passed through a through hole (not shown) provided in the printed circuit board 20 and soldered to the bus bar 21, so that the board relay 50 is connected to the printed board 20. The board relay 50 mounted on the printed circuit board 20 and soldered to the printed circuit board 20 is disposed in the intermediate space S for heat dissipation.
The bus bar 21 fixed to the printed circuit board 20 extends in the vertical direction and is bent, and the external terminal connection portions 22 and 23 formed in the bent portion are the fuse mounting portion 13 of the upper case 11 and the connector mounting portion of the lower case 12. 14 are respectively connected to fuse terminals (not shown) or connector terminals (not shown).
Further, the bus bar 21 fixed to the outer surface of the printed circuit board 20 is in contact with the inner surfaces of the upper wall of the upper case 11 and the lower case 12, and the upper case 11 and the lower case 12 are used together as a heat dissipation material for the printed circuit board 20.

On the other hand, the bus bar 31 mounted on the insulating plate 30 is provided with a tuning fork-shaped relay connection terminal 32, and the relay connection terminal 32 is provided in the terminal accommodating chamber 44 a of the relay mounting portion 44 provided in the vertical frame portion 43 of the intermediate case 40. Inserting. The plug-in relay 51 is fitted to the relay mounting portion 44, the terminal of the plug-in relay 51 is connected to the relay connection terminal 32 inserted into the terminal accommodating chamber 44a of the relay mounting portion 44, and the plug-in relay 51 is connected to the relay mounting portion 44. It is disposed in the intermediate space S for heat dissipation so as to face the substrate relay 50.
In addition, the bus bar 31 mounted on the insulating plate 30 is also extended and bent in the vertical direction, and the external terminal connection portions 33, 34, and 35 formed in the bent portion are connected to the fuse mounting portion 15 and the fuse of the upper case 11. It is inserted into the bull link mounting portion 16 and the connector mounting portion 17 of the lower case, and connected to a fuse terminal (not shown), an output terminal 53 of the fusible link 52, and a connector terminal (not shown). As shown in FIG. 3, the input terminal 54 of the fusible link 52 is bolted to one end of another bus bar 55, and the other end of the bus bar 55 is inserted into the power terminal attaching portion 18 provided in the lower case 12. It is connected to a terminal (not shown) connected to the power line terminal.

  According to the above configuration, the printed circuit board 20 and the insulating plate 30 on which the bus bar 31 is mounted are supported by the intermediate case 40 so that an intermediate space is opened, and the electric connection box 10 is disposed oppositely in the vertical direction. In addition, the intermediate space can be used as a housing part for the board relay and the plug-in relay, and there is no need to provide a relay mounting part in the upper case 11 or the lower case 12. Since only the portion needs to be provided, the electrical junction box 10 can be downsized.

  Further, since the printed board 20 and the insulating plate 30 on which the bus bar 31 is mounted are not fixed to the intermediate case 40 by screwing, but are fixed by thermal welding, the printed board 20, the insulating plate 30 and the intermediate case 40 are heated. Even if it is deformed, it is possible to prevent rattling, to prevent the generation of abnormal noise and to prevent the printed circuit board 20, the insulating plate 30 and the intermediate case 40 from being disconnected. Moreover, since the screw is unnecessary, the number of parts can be reduced.

5 and 6 show a second embodiment of the present invention.
In the present embodiment, as in the first embodiment, the printed circuit board 20 and the first heat radiation intermediate space S1 disposed at the end portion (right end portion in FIG. 6) inside the case are opened and the other side of the case (in FIG. 6, The insulating plate 30 on which the bus bar 31 is mounted is disposed in the vertical direction with the inner surface of the left end portion) and the second heat radiation intermediate space S2 opened. That is, the printed circuit board 20 and the insulating plate 30 are arranged to face each other closer to the right end than the center inside the case.

  The intermediate case 40 includes a pair of upper and lower horizontal support frames 41 and 42 without providing a vertical frame portion, and both ends of the support frames 41 and 42 are thermally welded to the printed circuit board 20 and the insulating plate 30. . In the present embodiment, a vertical frame portion 45 projects from the lower case 12, and a relay mounting portion 46 is provided on the vertical frame portion 45, and the relay connection terminal 32 of the bus bar 31 is connected to the terminal accommodating chamber of the relay mounting portion 46. Contained. The plug-in relay 51 fitted to the relay mounting portion 46 is not disposed in the same space so as to face the board relay 50 mounted on the printed circuit board 20 as in the first embodiment, but instead is disposed in the vertical frame portion 45. Is disposed in the second heat radiation intermediate space S2 different from the substrate relay 50 in a state of projecting outward from the case. On the other hand, the board relay 50 is disposed in a first heat radiation intermediate space S <b> 1 provided between the printed board 20 and the insulating plate 30.

According to the above configuration, the board relay 50 connected to the printed circuit board 20 and the plug-in relay 51 connected to the bus bar 31 are not arranged in the same space, and the first heat radiation intermediate space S1 and the second heat radiation intermediate space S2, respectively. Since the plug-in relay 51 is arranged in a separate space and protrudes from the insulating plate 30 toward the outside of the case, the heat generated from the plug-in relay 51 is efficiently dissipated inside the case. Can do.
In addition, since another structure and an effect are the same as that of 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

It is a top view of the electrical junction box of a 1st embodiment of the present invention. It is an AA line sectional view of an electric junction box. It is a BB line sectional view of an electric junction box. (A) (B) is drawing which shows the process of heat-welding an intermediate | middle case to a printed circuit board and an insulating board. It is a top view of the electrical junction box of a 2nd embodiment of the present invention. It is CC sectional view taken on the line of an electrical junction box. It is drawing which shows a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Electrical connection box 11 Upper case 12 Lower case 13, 15 Fuse mounting part 14 Connector mounting part 20 Printed circuit board 21 Bus bar 22, 23 External terminal connection part 30 Insulation board 31 Bus bar 32 Relay connection terminal 33, 34, 35 External terminal connection part 40 Intermediate cases 41, 42 Support frame 43 Vertical frame portion 44 Relay mounting portion 50 Substrate relay 51 Plug-in relay S Heat radiation intermediate space S1 First heat radiation intermediate space S2 Second heat radiation intermediate space

Claims (3)

A printed circuit board and an insulating plate on which a bus bar is mounted are arranged opposite to each other in the vertical direction on both left and right ends of the case composed of an upper case and a lower case, and the heat dissipation intermediate space An intermediate case in which a pair of upper and lower horizontal support frames and one vertical frame portion connecting the upper and lower support frames are integrally formed is disposed.
Protrusions provided on the upper and lower support frames of the intermediate case are projected through mounting holes formed in the printed circuit board and the insulating plate, and the projecting parts are thermally welded to the printed circuit board and the insulating plate. ,
A board relay mounted on the printed circuit board is disposed in the intermediate space for heat dissipation, and a relay connection terminal protruding from the bus bar is inserted into a relay mounting portion provided in a vertical frame portion of the intermediate case, and the relay A plug-in relay is fitted to the mounting portion and disposed in the intermediate space for heat dissipation,
In addition, a bus bar mounted on the insulating plate and a bus bar fixed to the printed circuit board are extended and bent, and an external terminal connection portion formed in the bent portion is attached to the upper case and the lower case. An electrical junction box for automobiles, wherein the electrical connection box is inserted into the connector and the connector mounting portion. A printed circuit board is disposed on the left and right sides of the case composed of the upper case and the lower case, and the printed circuit board side and the first heat radiation intermediate space are opened, and the inner surface on the other side of the case and the second side An insulating plate with a bus bar is placed in the middle space for heat dissipation.
An intermediate case having a pair of upper and lower horizontal support frames is disposed in the first heat radiation intermediate space, and protrusions provided on the upper and lower support frames of the intermediate case are formed in the printed circuit board and the insulating plate. Is projected through the mounting hole, and the protruding portion is thermally welded to the printed circuit board and the insulating plate,
A board relay mounted on the printed circuit board is disposed in the first heat radiation intermediate space, and a relay connection terminal protruding from the bus bar is inserted into a relay mounting portion provided on a vertical frame protruding from the lower case A plug-in relay is fitted to the relay mounting portion and disposed in the second heat radiation intermediate space,
In addition, a bus bar mounted on the insulating plate and a bus bar fixed to the printed circuit board are extended and bent, and an external terminal connection portion formed in the bent portion is attached to the upper case and the lower case. An electrical junction box for automobiles, wherein the electrical connection box is inserted into the connector and the connector mounting portion.   3. The electric connection box for an automobile according to claim 1, wherein the printed circuit board is brought into contact with inner surfaces of the peripheral walls of the upper case and the lower case, and the upper case and the lower case are used in combination with a heat dissipation material of the printed circuit board.

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