JP2001025137A - Electrical junction box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To downsize an electrical junction box by miniaturizing an electronic circuit part. SOLUTION: An electronic circuit part is formed so as to be separated into a power circuit insert frame assembly 13, involving a power system part 21 and a bus bar as a circuit routing member, and a control circuit insert frame assembly 17, involving a control substrate assembly 16 forming a control circuit and a bus bar as a circuit routing member, and a power circuit insert frame assembly 13 and the control circuit insert frame assembly 17 are layered with a branch circuit insert frame assembly 14 which has a bus bar serving as a circuit routing member and forming a branch circuit, the bus bars of the branch circuit insert frame assembly 14 and the control circuit insert frame assembly 17 are formed, to be a thickness smaller than the desired thickness of connector terminals 26a, 29a, and the connector terminals 26a, 29a having the desired thickness are fixed to the bus bars.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric junction box having an electronic circuit section and a branch circuit formed by using a bus bar as a circuit routing material.

[0002]

2. Description of the Related Art A conventional electric junction box of this kind is shown in FIGS.
7 is an exploded perspective view of the electric junction box, FIG. 8 is a perspective view of a bus bar used in the electric junction box, and FIG. 9 is a perspective view of an electronic circuit portion.

In FIGS. 7 to 9, an electric connection box 1 covers an electric connection box main body 2, an electronic circuit section 3 laminated on the electric connection box main body 2, and an upper portion of the electronic circuit section 3. And a circuit section cover 4 arranged at the same position. A bus bar 5 made of a copper alloy shown in FIG. 8 is housed in the electric connection box main body 2, and a branch circuit is formed by using the bus bar 5 as a circuit routing material. A part of the end of the bus bar 5 is bent, and the bent portion is configured as a connector terminal 6. As shown in FIG. 9, the electronic circuit section 3 includes a printed circuit board 7 made of a glass cloth epoxy copper clad laminate.
Microcomputer, IC, resistor, capacitor, transistor,
An electronic component 8 such as a relay and a connector 9 are mounted.
The electronic circuit unit 3 includes an electronic circuit having functions such as multiplex communication, load control, and warning.

[0004] A similar technique concerning this electric junction box is as follows.
JP-A-9-28019, JP-A-9-233651
No. 6,086,045.

[0005]

However, in the conventional electric connection box 1, since all the electronic components 8 are mounted on the substrate 7 of the electronic circuit section 3, the substrate 7 tends to be large. Accordingly, there is a problem that the electric junction box 1 becomes large.

Further, in order to form the connector terminal 6 integrally with the bus bar 5, it is necessary to adjust the thickness of the bus bar 5 to a large thickness (for example, t = 0.64 mm) required for the connector terminal 6. When the bus bar 5 is made thicker, a large press machine is required for the processing, and there is a problem that the precision processing of the bus bar 5 cannot be performed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and has as its object to provide an electric connection box which can reduce the space occupied by the electronic circuit section and make it smaller as a whole. It is another object of the present invention to provide an electric junction box that can be made compact by making the space occupied by the electronic circuit unit compact, and that can precisely process the bus bars that constitute the branch circuit.

[0008]

According to a first aspect of the present invention, there is provided an electric connection box comprising an electronic circuit portion, and a bus bar serving as a circuit routing member, forming a branch circuit. And a power circuit insert frame assembly using a bus bar as a circuit routing material, and a control circuit insert frame assembly using a control board assembly constituting a control circuit and using the bus bar as a circuit routing material. The power circuit insert frame assembly and the control circuit insert frame assembly are laminated and stacked together with a branch circuit insert frame assembly that constitutes the branch circuit using bus bars as a circuit routing material. It is characterized by.

In this electric junction box, the electronic circuit section is divided into a power circuit insert frame assembly and a control circuit insert frame assembly on which a control board assembly is mounted. They are arranged in a stacked state, and can be made more compact as compared with the conventional case where the electronic circuit unit is an integrated assembly.

According to a second aspect of the present invention, there is provided the electrical junction box according to the first aspect, wherein the bus bar of the branch circuit insert frame assembly has a thickness smaller than a desired thickness of the connector terminal. A connector terminal having a desired thickness is fixed to the bus bar.

In this electrical junction box, in addition to the operation of the first aspect of the invention, the bus bar of the branch circuit insert frame assembly is thin, so that the bus bar can be processed by a small press machine.

According to a third aspect of the present invention, there is provided the electric connection box according to the second aspect, wherein the bus bar of the control circuit insert frame assembly has a thickness smaller than a desired thickness of the connector terminal. A connector terminal having a desired thickness is fixed to the bus bar.

In this electric junction box, in addition to the operation of the second aspect of the invention, since the bus bar of the control circuit insert frame assembly is thin, the bus bar can be machined by a small press machine.

According to a fourth aspect of the present invention, there is provided the electrical junction box according to any one of the first to third aspects, wherein the control circuit insert frame assembly is configured by mounting electronic components on a high-density wiring board. It is characterized by.

In this electric junction box, claims 1 to 3 are provided.
In addition to the effects of the invention, electronic components can be mounted on the high-density wiring board at high density.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

1 to 6 show one embodiment of the present invention.
FIG. 1 is an exploded perspective view of a plurality of insert frame assemblies housed in an electric connection box, FIG. 2 is a cross-sectional view of the electric connection box, FIG. 3 is a partially enlarged perspective view of a board, and FIG. FIG. 5 is a perspective view showing a mounted state of power components, and FIG. 6 is a perspective view showing a mounted state of a control board assembly.

As shown in FIGS. 1 and 2, an electric connection box 10 having an electronic circuit section is provided with a control circuit in which the electronic circuit section has a power circuit insert frame assembly 13 and a control board assembly 16 mounted thereon. And an insert frame assembly 16. The electric connection box 10 includes a power circuit insert frame assembly 13, a branch circuit insert frame assembly 14, a partition plate 15, and a control board between the lower case 11 and the upper case 12 in order from the top. The control circuit insert frame assembly 17 on which the assembly 16 is mounted is housed in a stacked state.

As shown in detail in FIG. 1, the power circuit insert frame assembly 13 is formed by using a bus bar 18 (shown in FIG. 5) as a circuit routing material and insert-molding the bus bar 18 into a resin. And a power system component 21 mounted on the substrate 20 and a power supply upstream connector 22 fixed to the substrate 20. In this embodiment, the power system component 21 includes a mechanical relay 21a and a semiconductor relay 21b. For example, as shown in FIG. 5, the terminal of the semiconductor relay 21b is soldered to the bus bar 18 exposed from the resin as shown in FIG. It is mounted and attached. Also, the substrate 20
A part of the bus bar 18 is protruded from the resin in parallel at one end surface of the bus bar 18, and this protruding portion is configured as a fuse terminal 23. The bus bar 18 used in the power circuit insert frame assembly 13 has a large plate thickness (t = 0.64).

Branch circuit insert frame assembly 14
Uses a bus bar 18 (shown in FIG. 3) as a circuit routing material, inserts the bus bar 18 into a resin and forms a board 24, and a fuse connector fixed on the board 24 without a fuse terminal. And a plurality of connector portions 26 fixed to the substrate 24. The bus bar 18 forms a branch circuit, and this branch circuit has a power distribution and a wire harness dividing function. The bus bar 18 used in the branch circuit insert frame assembly 14 is, as shown in FIG.
A thin plate (t = 0.2) is used.

When the power circuit insert frame assembly 13 is laminated, the fuse connector 23 becomes a terminal of the fuse terminal 23. The connector section 26 has a connector terminal 26a connected to the branch circuit,
As shown in FIG. 4, the connector terminal 26a is connected and fixed to the end of the bus bar 18 by laser welding or micro spot welding. Connector terminal 2
6a is the desired thickness (t =
0.64) is used. Connector case 26
b is formed simultaneously with insert molding.

Control circuit insert frame assembly 17
Uses a bus bar 18 (shown in FIG. 3) as a circuit routing material, inserts the bus bar 18 into a resin and forms a board 27, and a control board assembly 16 mounted on the board 27. And large circuit components 28 such as a power supply unit 28a for an electronic circuit unit and an electrolytic capacitor 28b mounted on the board 27, and connector sections 29 fixed at three places on the board 27. The control board assembly 16 is configured by mounting electronic components 30 such as custom LSIs, HICs, and microcomputers on a multilayer ceramic substrate 31 which is a high-density wiring board.

As shown in detail in FIG. 6, a part of the bus bar 18 of the board 27 is formed of a plurality of board terminals 32 exposed from a resin. It is configured such that the positions of the plurality of terminals 33 of the attachment 16 match. And the control board assembly 1
6 is mounted by soldering the plurality of terminals 33 of the control board assembly 16 to the plurality of board terminals 32 of the board 27, respectively. Further, as shown in FIG. 4, for example, the connector portion 29 is provided with the branch circuit insert frame assembly 1.
4 is formed in substantially the same manner as the connector 26. That is, the connector portion 29 is composed of the connector terminal 29a fixedly connected to the end of the bus bar 18 and the connector case portion 29b formed simultaneously at the time of insert molding, for example. And this control circuit insert frame assembly 1
As shown in FIG. 3, the bus bar 18 used for the plate 7 has a small thickness (t = 0.2).

According to the above configuration, the electronic circuit section includes the control circuit insert frame assembly 17 on which the power circuit insert frame assembly 13 and the control board assembly 16 are mounted.
And both of the insert frame assembled bodies 13,
14 are arranged in a stacked state, the height direction is slightly higher than in the conventional case where the electronic circuit section is an integrated assembly. Can be configured so that the electrical junction box 10
Can be reduced in size. Also, if the control board assembly 16 is a custom L
Since the electronic components 30 such as SI are mounted at a high density using the multilayer ceramic substrate 31, the electric connection box 10 can be downsized. Also, the electric connection box 10
The degree of freedom of assembling to a vehicle is improved by reducing the size of the vehicle.

Also, a branch circuit insert frame assembly 1
Since the bus bar 18 of No. 4 has a small thickness (t = 0.2), the bus bar 18 can be machined by a small press machine, so that the bus bar 18 of the branch circuit insert frame assembly 14 can be precisely machined. Possible, cost reduction,
It becomes lighter. Furthermore, in this embodiment, since the bus bar 18 of the control circuit insert frame assembly 17 is also thin (t = 0.2), the bus bar 18 can be processed by a small press machine. The precision processing of the bus bar 18 of the control circuit insert frame assembly 17 becomes possible, which leads to further cost reduction and weight reduction.

In the above embodiment, the high-density wiring board is constituted by the multilayer ceramic substrate 31. However, any high-density wiring pattern may be formed so that electronic components can be mounted at high density.

[0027]

As described above, according to the first aspect of the present invention, in an electric junction box having an electronic circuit portion and using a bus bar as a circuit routing material to form a branch circuit, the electronic circuit portion is provided with a power supply. A power circuit insert frame assembly that mounts system components and uses a bus bar as a circuit routing material, and a control circuit insert frame assembly that mounts a control board assembly that forms a control circuit and uses a bus bar as a circuit routing material And the power circuit insert frame assembly and the control circuit insert frame assembly, wherein a branch circuit insert frame assembly that constitutes the branch circuit using a bus bar as a circuit routing material. Since the electronic circuit portion is laminated with the power circuit insert frame assembly and a control circuit insert frame assembly that mounts the control board assembly, To place a square insert frame assembly body in a stacked state, the electronic circuit unit as in the prior art it can be made compact as compared with the case where the assembled unit of the integral, can be miniaturized electrical connection box body. In addition, the degree of freedom of assembling to a vehicle is improved by downsizing the electric connection box.

According to a second aspect of the present invention, in the electrical junction box according to the first aspect, the bus bar of the branch circuit insert frame assembly has a thickness smaller than a desired thickness of the connector terminal. Since the connector terminal having a desired thickness is fixed to the bus bar, in addition to the effect of the invention of claim 1, the bus bar of the branch circuit insert frame assembly has a small thickness, so that the bus bar can be processed by a small press machine. Therefore, the precision processing of the bus bar of the branch circuit insert frame assembly becomes possible, which leads to cost reduction and weight reduction.

According to a third aspect of the present invention, in the electrical junction box according to the second aspect, the bus bar of the control circuit insert frame assembly has a thickness smaller than a desired thickness of the connector terminal. Since the connector terminal having a desired thickness is fixed to the bus bar, in addition to the effect of the invention according to claim 2, since the bus bar of the control circuit insert frame assembly is thin, the bus bar can be processed by a small press machine. Therefore, the precision processing of the bus bar of the control circuit insert frame assembly can be performed, and the cost and weight can be further reduced.

According to a fourth aspect of the present invention, there is provided the electrical junction box according to any one of the first to third aspects, wherein the control circuit insert frame assembly includes electronic components mounted on a high-density wiring board. Therefore, in addition to the effects of the inventions of claims 1 to 3, electronic components can be mounted on the high-density wiring board at a high density, so that the electric connection box can be further downsized. Further, the degree of freedom of assembling to a vehicle is further improved by downsizing the electric junction box.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a plurality of insert frame assemblies housed in an electric junction box according to an embodiment of the present invention.

FIG. 2 shows one embodiment of the present invention and is a cross-sectional view of an electric junction box.

FIG. 3 is a partially enlarged perspective view of a substrate, showing one embodiment of the present invention.

FIG. 4 is a perspective view illustrating an embodiment of the present invention and illustrating the creation of a connector terminal.

FIG. 5 is a perspective view showing an embodiment of the present invention and showing a mounted state of power-related components.

FIG. 6 is a perspective view illustrating the mounted state of the control board assembly according to the embodiment of the present invention.

FIG. 7 is an exploded perspective view of a conventional electric junction box.

FIG. 8 is a perspective view of a bus bar used in a conventional electric junction box.

FIG. 9 is a perspective view of a conventional electronic circuit unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Electric connection box 13 Power circuit insert frame assembly 14 Branch circuit insert frame assembly 16 Control board assembly 17 Control circuit insert frame assembly 18 Busbar 21 Power system components 26a, 29a Connector terminal 30 Electronic component 31 High High density wiring board (multilayer ceramic board)

Claims (4)

[Claims] 1. An electric junction box comprising an electronic circuit portion and a bus bar serving as a circuit routing material, forming a branch circuit, wherein the electronic circuit portion has a power system component mounted thereon and has a bus bar serving as a circuit routing material. The power circuit insert frame, comprising a circuit insert frame assembly and a control board assembly that forms a control circuit, and divided into a control circuit insert frame assembly that uses a bus bar as a circuit routing material. An electric connection box, wherein an assembly and the control circuit insert frame assembly are laminated together with a branch circuit insert frame assembly constituting the branch circuit using a bus bar as a circuit routing material. 2. The electric junction box according to claim 1, wherein a bus bar of the branch circuit insert frame assembly is:
An electrical connection box, wherein the connector terminal has a thickness smaller than a desired thickness of the connector terminal, and the connector terminal having a desired thickness is fixed to the bus bar. 3. The electric connection box according to claim 2, wherein the bus bar of the control circuit insert frame assembly is:
An electrical connection box, wherein the connector terminal has a thickness smaller than a desired thickness of the connector terminal, and the connector terminal having a desired thickness is fixed to the bus bar. 4. The electrical junction box according to claim 1, wherein the control circuit insert frame assembly is configured by mounting electronic components on a high-density wiring board. Connection box.