JPH09261821A - Electric connection box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance functions of, and reduce the size and weight of, an electric connection box, and reduce the number of its components by housing a printed board and an internal circuit comprising cold-welded terminals in layers in a case, and protruding external connecting terminals, formed on some of the cold-welded terminals, at connector housing sections, formed on the outside of the case. SOLUTION: A printed board 13 mounted with electronic components as the lower layer and a circuit comprising single core wires 14 and cold-welded terminals 15, 16 as the lower layer, are housed in the lower case 10 and the upper case 11 of an electric connection box. The printed board 13 has printed conductive portions 13a, 13b formed on its top and underside, and an electronic component 12 mounted on the top is connected with the conductive portion 13a on the top. The lower end 16a of the cold-welded terminal 16 is passed through a terminal hole 13c formed in the printed board 13, and is connected with the conductive portion 13b on the underside through solder 17. This makes it possible to significantly reduce the size and weight of the electric connection box and further reduce the number of components required.

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 such as a junction box for an automobile, and has a highly functional internal circuit accommodated in the electric junction box to reduce the size and weight of the electric junction box. This is to reduce the score.

[0002]

2. Description of the Related Art Conventionally, an internal circuit of an electric connection box such as a junction box is mainly composed of a bus bar formed by punching a conductive metal plate, and the bus bar is laminated and sandwiched with an insulating plate. There are many. When the internal circuit is configured by the bus bar as described above, when the circuit is changed, the bus bar needs to be newly processed, resulting in high cost.
Therefore, the internal circuit of the load side circuit downstream of the fuse, which is relatively frequently changed, may be composed of an electric wire (single core wire) and a pressure contact terminal for pressure contacting the electric wire.

A printed circuit board on which electronic parts such as a relay, a diode and a capacitor are mounted may be attached to an electric connection box. In that case, for example, the device shown in FIG. It is provided. (JP-A-60-16110) In the above device, the bus bar 2 is provided on a part of the upper surface of the insulating plate 1, while the printed conductive path is provided on the other part of the lower surface of the insulating plate 1 and connected to the conductive path. The electronic component 3 thus prepared is installed on the upper surface of the insulating plate 1, and the tab-shaped terminals 4 connected to the conductive paths are erected on the upper surface of the insulating plate 1. The insulating plate 1 is covered with a cover 5 to cover the tab-shaped terminals 4 and the tab-shaped terminals 2 a bent from the bus bar 2.
An external circuit is connected to the connector portion 5a provided on the base plate by being projected.

The electronic control block assembled from the insulating plate 1 and the cover 5 is connected and fixed to an electric connection box through a dedicated connector (not shown). There is also a configuration in which a printed circuit board on which electronic components are mounted is housed inside the electrical connection box, but in that case, the internal circuit of the electrical connection box and the conductive path of the printed circuit board are connected to each other. It is connected via a dedicated connector housed inside.

[0005]

If the internal circuit of the electric junction box is the bus bar alone or the bus bar is combined with the internal circuit consisting of the single core wire and the pressure contact terminal, the wiring space is large. Therefore, the electric junction box becomes large and heavy, and it is difficult to miniaturize the electric junction box by high-density wiring.

When it is necessary to provide a printed circuit board on which electronic components are mounted, a dedicated connector for connecting the electronic control block accommodating the printed circuit board on which the electronic components are mounted and the electric connection box is required. There is a problem that the number of parts increases. In addition, when the electronic control block is connected and fixed to the outside of the case of the electric connection box, the installation space increases if these are combined, and when the electronic control unit is housed inside the electric connection box, the electric connection box itself is larger. There is a problem that it becomes heavy and heavy.

The present invention has been made in view of the above problems, and improves a structure of an internal circuit of an electric junction box, improves a layout form of the internal circuit, and provides a printed circuit board on which an electronic component is mounted. The purpose is to house in the electrical junction box and to connect to the internal circuit without the need for a dedicated connector to improve the functionality of the electrical junction box, reduce its size and weight, and reduce the number of parts. I am trying.

[0008]

In order to achieve the above object, the present invention provides a printed circuit board on which electronic parts are mounted, an electric wire and the electric wire as an internal circuit to be housed in a case of an electric connection box. A press-connecting terminal press-contacted to the housing, and these two types of internal circuits are layered and housed inside the case, and a part of the press-connecting terminal press-contacted to the electric wire is connected to the conductive portion of the printed circuit board, and the press-connecting terminal is also provided. There is provided an electric connection box characterized in that an external connection terminal is provided on a part of the case and is projected into a connector accommodating portion formed on the outer surface of the case.

Specifically, in the lower case of the electric connection box,
While accommodating a printed circuit board on which electronic components are mounted, a pressure contact terminal is press-fitted and fixed in a terminal mounting hole provided in the upper case, and a U-shaped slot formed under the pressure contact terminal is wired above the printed circuit board. A single-core wire is press-fitted for pressure-contact connection, and a pressure-contact terminal having a U-shaped slot formed on the upper part is pressure-connected to the single-core wire. The tab at the lower end of the pressure-contact terminal is soldered to the conductive path of the printed circuit board. Etc. are directly connected. That is, the printed circuit board and the single-core wire are directly connected via the pressure contact terminal. Thus, by efficiently arranging the printed board on which electronic components are mounted in the lower layer and the circuit including the single core wire and the pressure contact terminal in the upper layer in a two-layer structure inside the case including the lower case and the upper case, The electric junction box is being miniaturized.

According to a second aspect of the present invention, a printed circuit board on which electronic parts are mounted and an FPC (flexible printed circuit) are provided as internal circuits to be housed inside the case of the electric junction box. Two types of internal circuits are layered and housed inside the case, one end of the FPC is bent toward the printed circuit board side to connect the FPC and the conductive portion of the printed circuit board, and at least externally connected to the conductive path of the FPC. Provided is an electrical connection box, wherein one end of a terminal provided with a terminal is connected, and the external connection terminal of these terminals is projected into a connector accommodating portion formed on the outer surface of the case.

Specifically, in the lower case of the electrical junction box,
While accommodating the printed circuit board on which the electronic parts are mounted, the terminal is press-fitted and fixed in the terminal mounting hole provided in the upper case, and the lower portion of the terminal is connected to the conductive portion of the FPC arranged inside the case with solder or the like. Bend one side downwards,
The conductive path of the FPC is connected to the conductive path of the printed circuit board arranged below by soldering or the like. That is, the printed circuit board and the FPC are directly connected. Thus, by efficiently disposing the printed circuit board on which electronic components are mounted in the lower layer, the circuit composed of the FPC in the upper layer, and in the two-layer structure inside the case including the lower case and the upper case,
The electric junction box is being miniaturized.

Further, according to a third aspect of the present invention, an FPC (flexible printed circuit) as an internal circuit inside the case of the electric junction box, a printed circuit board on which electronic parts are mounted, an electric wire and the electric wire are provided. A pressure contact terminal that is pressure-contacted, and these three types of internal circuits are layered and housed inside the case, and one end of the FPC is bent toward the printed circuit board side to connect the conductive part of the FPC and the printed circuit board, Moreover, one end of a terminal provided with an external connection terminal is connected to the conductive path of the FPC, and the external connection terminal of these terminals is projected into the connector accommodating portion formed on the outer surface of the case. Part is connected to the conductive portion of the printed circuit board, external connection terminals are provided on some of these pressure contact terminals, and they are projected into the connector accommodating portion formed on the outer surface of the case. It provides an electrical junction box that.

Specifically, the printed circuit board having a combination of claim 1 and claim 2 is arranged on the upper side of the lower case, and the FPC connected to the terminals is arranged on the upper side. Then, one side of the FPC is bent downward to be directly connected to the conductive path of the printed circuit board by soldering or the like, while a single core wire is wired inside the lower case below the printed circuit board, and the press-fit terminal fixed to the lower case by press fitting is connected. The pressure contact terminal is fixed to the core wire by pressure, and the upper end of the pressure contact terminal fixed to the single core wire by pressure is connected to the conductive path of the printed circuit board by soldering or the like. In this way, a printed circuit board on which electronic components are mounted is sandwiched in a case composed of a lower case and an upper case, and a circuit composed of an FPC is provided as an upper layer, and a circuit composed of a single core wire and a pressure contact terminal is provided as a lower layer, and a three-layer structure is provided. The electrical connection box is downsized by arranging it efficiently.

Further, according to the present invention, in claim 4, the internal circuit composed of a bus bar is also housed in a part of the inside of the case of the electric junction box. We provide electrical junction boxes.

In other words, a bus bar may be used as a large current circuit connected to the power supply side. In that case, the bus bar is layered with a printed circuit board, an FPC, and internal circuits each consisting of a combination of a single wire and a pressure contact terminal. It is housed inside the electrical junction box.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a first embodiment, which is a lower case 10 and an upper case 1 of an electric junction box.
A printed circuit board 13 having an electronic component 12 mounted therein.
Is disposed in the lower layer, and a circuit including the single core wire 14 and the pressure contact terminals 15 and 16 is disposed in the upper layer in a two-layer structure.

Both ends of the printed circuit board 13 are placed on stepped locking portions 10a formed on the inner surface of the peripheral wall of the lower case 10 and horizontally arranged over the entire inner surface of the lower case 10. Printed conductive portions 13a and 13b are formed on both upper and lower surfaces of the printed circuit board 13, and the electronic component 12 mounted on the upper surface is connected to the conductive portion 13a on the upper surface. Further, the lower end portion 16a of the press contact terminal 16 is penetrated through the terminal hole 13c formed in the printed circuit board 13, and the conductive portion 13 on the lower surface is formed.
It is connected to b with solder 17. Instead of the solder 17, the lower end portion 16a of the pressure contact terminal may be welded to the conductive portion 13b.

On the other hand, a connector accommodating portion 11a is formed on the upper surface of the upper case 11, a terminal hole 11b is provided at a position corresponding to the bottom wall of the connector accommodating portion 11a, and the press contact terminal 15 is press-fitted and fixed. The lower portion of the press contact terminal 15 is provided with a slot 15a that opens downward as a wire press contact portion. Further, an upwardly opening slot 16b is provided above the press contact terminal 16 whose lower part is connected to the printed circuit board 13.

The single core wire 14 is press-fitted into the slot 16b which is opened upward of the pressure contact terminal 16, and the insulation coating of the single core wire 14 is cut by the pressure contact blade 16c formed on the peripheral edge of the slot 16b to be connected to the core wire. In this state, the upper case 11 is covered and fixed to the slot 15 of the pressure contact terminal 15.
"a" is press-fitted into the single core wire 14, and the insulating coating of the single core wire 14 is cut by the press contact blade 15b formed on the peripheral edge of the slot 15a to be connected to the core wire.

In the electric junction box of the first embodiment, the electronic component 12 is mounted on the upper side of the printed circuit board 13 mounted on the upper surface,
The internal circuit consisting of the single-core wire 14 and the pressure contact terminals 15 and 16 is 2
The single core wire 14 and the printed circuit board 13 are housed in a layered structure, and are directly connected to each other via a pressure contact terminal 16.

FIG. 3 shows a second embodiment, and the lower case 1
0 and the upper case 11 inside the electrical junction box, the printed circuit board 1 with the electronic component 12 mounted downward
3 is arranged, and the FPC 20 is arranged above it. F
The PC 20 has a structure in which a copper foil is arranged and sandwiched between insulating sheets on both sides and has flexibility. In the FPC, one side 20a thereof is locked to a locking portion 10b projecting from the inner surface of the peripheral wall of the lower case 10, and the opposite side 20b is bent downward so that a conductive path made of the copper foil is provided on the upper surface of the printed board 13. The printed conductive portion 13a provided is fixedly connected with solder 21.

On the other hand, a connector accommodating portion 11a is formed on the upper surface of the upper case 11, a terminal hole 11b is provided at a position corresponding to the bottom wall of the connector accommodating portion 11a, and a tab-shaped terminal 22 is press-fitted and fixed. The lower portion of the tab-shaped terminal 22 is F
It is fixedly connected to the conductive portion of the PC 20 with solder 23.

In the electrical junction box of the second embodiment, the electronic component 12 is mounted on the upper side of the printed circuit board 13 mounted on the lower surface,
The internal circuit composed of the FPC 20 is housed in a two-layer structure,
The PC 20 and the conductive path of the printed circuit board 13 are directly connected by solder 21.

FIG. 4 shows a third embodiment, and the lower case 1
The printed circuit board 13 with the electronic component 12 attached downward is arranged in the central part of 0, the internal circuit composed of the FPC 20 is arranged on the upper side thereof, and the internal circuit composed of the single core wire 14 and the pressure contact terminals 15 and 16 is arranged on the lower side. Are arranged. That is, it has a configuration in which the first embodiment and the second embodiment are combined.

The FPC 20 has one side bent downward, the conductive path of which is directly connected to the upper conductive path of the printed circuit board 13 by the solder 21, and the single-core wire 14 arranged on the lower side.
And the pressure contact terminal 16 for connection. The lower portion of the pressure contact terminal 15 pressure-connected to the single core wire 14 is projected from the terminal hole 10e of the connector housing portion 10d formed in the lower case 10 so as to be connected to an external circuit (not shown).
In addition, the tab-shaped terminal 22 connected to the FPC 20 with the solder 23
The upper end of is projected from the terminal hole 11b of the connector housing portion 11a of the upper case 11 so as to be connected to an external circuit (not shown).

FIG. 5 shows a fourth embodiment. In the third embodiment, an internal circuit consisting of a combination of a single core wire and pressure contact terminals is arranged under the printed circuit board 13, but in the fourth embodiment, The bus bar 30 is arranged on the lower surface of the printed circuit board 13. That is, the FPC 20 is arranged on the upper side and the bus bar 30 is arranged on the lower side with the printed circuit board 13 on which the electronic component 12 is mounted sandwiched between the lower surfaces to form a three-layer structure.

The bus bar 30 is used for a large current circuit connected to the power source side, and the printed circuit board 1 is provided on the upper side thereof.
3. By arranging the FPCs 20 in layers, it is possible to achieve higher functionality, smaller size, and lighter weight of the electrical junction box, as compared with the case where the internal circuit of the electrical junction box is composed of only the bus bar 30.

FIG. 6 shows a fifth embodiment, and the lower case 1
The internal circuit consisting of the single core wire 14 and the pressure contact terminal 15, the bus bar 30 ′, the printed circuit board 13 having the electronic component 12 attached to the lower side, and the FPC 20 are layered from the bottom inside the case consisting of 0 and the upper case 11. They are arranged in a four-layer structure.

The bus bar 30 'and the single core wire 14 are connected by soldering the upper end of the pressure contact terminal 31 to which the lower slot 31a of the single core wire 14 is pressure connected to the bus bar 30'. Further, the pressure contact terminal 33 fixed by solder is connected to the single core wire 14 by pressure contact with the conductive path of the printed circuit board 13 above the bus bar 30 ′ through the layer of the bus bar 30 ′. Further, the lower surface conductive path of the printed circuit board 13 and the bus bar 30 ′ are inserted into a connector 35 formed on the lower surface of the printed circuit board 13 by inserting a tab 30 ′ a formed by being bent from the bus bar 30 ′. To connect the printed circuit board 13 and the bus bar. Further, the tab 30'b formed by being bent from the bus bar 30 'is pressed into contact with the terminal 1
5, the lower case 10 is projected through the terminal hole into the connector accommodating portion so as to be connected to an external circuit.

When the above-mentioned four types of internal circuits are used, it is possible to use a material corresponding to the current value of each circuit, and moreover,
Because they can be connected to each other directly or via terminals,
It is possible to make an electrical junction box with high density and high functionality while achieving miniaturization.

FIG. 7 shows a sixth embodiment, and the lower case 1
0 and an upper case 11 inside a case, a printed circuit board 1 having an electronic component 12 attached to the lower side from the lower side.
3, the FPC 20 is divided into upper layers and arranged in a two-layer structure, which is the same as the second embodiment in FIG. The difference is that the lower end of the tab-shaped terminal 40 directly connected to the conductive path of the printed circuit board 13 by solder is projected from the terminal hole of the connector accommodating portion provided in the lower case 10 to be connected to an external circuit. . With this structure, connector housing portions provided on both surfaces of the upper case 11 and the lower case 10 can be connected to an external circuit by a connector.

[0032]

As is apparent from the above description, in the electric connection box according to the present invention, the printed circuit board on which the electronic parts are mounted is provided with another internal circuit of the electric connection box, for example, a combination of the electric wire and the pressure contact terminal. In combination with the internal circuit consisting of the FPC and the internal circuit consisting of the FPC, the layers are arranged in upper and lower layers, so that they can be efficiently housed in the electrical junction box. Therefore, compared to a case where a printed circuit board on which electronic components are mounted is attached to an electrical junction box via a dedicated connector, the size and weight can be significantly reduced, and the number of required components can be reduced. .

Further, the internal circuit of the electric connection box is not a structure mainly composed of the bus bar, which is different from the conventional one, in which only the bus bar or the internal circuit composed of the combination of the electric wire and the pressure contact terminal is combined with the bus bar. It is possible to reduce the size, weight and cost.

Furthermore, since a plurality of types of internal circuits are used, it is possible to select and use an internal circuit corresponding to the amount of energization.

[Brief description of drawings]

FIG. 1 is a sectional view of an electric junction box according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view of the electrical junction box of the first embodiment.

FIG. 3 is a sectional view of an electrical junction box of a second embodiment.

FIG. 4 is a sectional view of an electrical junction box of a third embodiment.

FIG. 5 is a sectional view of an electrical junction box of a fourth embodiment.

FIG. 6 is a sectional view of an electrical junction box of a fifth embodiment.

FIG. 7 is a sectional view of an electrical junction box of a sixth embodiment.

FIG. 8 is an exploded perspective view showing a conventional electric junction box.

[Explanation of symbols]

 10 Lower Case 11 Upper Case 12 Electronic Component 13 Printed Circuit Board 14 Single Core Wire 15 and 16 Pressure Contact Terminal 20 FPC 30 Bus Bar

Claims (4)

[Claims] 1. An internal circuit housed inside a case of an electrical junction box, comprising a printed circuit board on which electronic components are mounted, an electric wire and a pressure contact terminal pressed against the electric wire, and these two kinds of internal circuits are provided inside the case. A connector accommodating portion formed on the outer surface of the case by accommodating in layers and connecting a part of the pressure contact terminal pressed against the electric wire to the conductive portion of the printed circuit board and providing an external connection terminal on a part of the pressure contact terminal. An electrical junction box characterized by being projected to the inside. 2. A printed circuit board on which electronic parts are mounted, and an FP as an internal circuit to be housed inside a case of an electric junction box.
C (Flexible Printed Circuit), these two types of internal circuits are layered and housed inside the case, and one end of the FPC is bent to the printed circuit board side to form an F
A connector accommodating portion in which a PC and a conductive portion of a printed circuit board are connected to each other, and at least one end of a terminal provided with an external connection terminal is connected to a conductive path of an FPC, and the external connection terminal of these terminals is formed on the outer surface of the case. An electrical junction box characterized by being projected to the inside. 3. An FPC (flexible printed circuit) as an internal circuit, a printed circuit board on which an electronic component is mounted, an electric wire and a pressure contact terminal pressed against the electric wire are provided inside the case of the electric junction box. The three types of internal circuits are layered and housed in the case, one end of the FPC is bent toward the printed circuit board side to connect the FPC and the conductive portion of the printed circuit board, and externally connected to the conductive path of the FPC. While connecting one end of the terminal equipped with a terminal and projecting the external connection terminals of these terminals into the connector accommodating portion formed on the outer surface of the case, a part of the pressure contact terminal pressed against the electric wire is connected to the conductive portion of the printed circuit board. An electrical connection box characterized in that the external connection terminals are provided for connection with a part of these pressure contact terminals and are projected into a connector accommodating portion formed on the outer surface of the case. 4. The electric junction box according to claim 1, further comprising an internal circuit formed of a bus bar in a part of a case inside of the electric junction box.