JPH09308049A - Electrical junction box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the transit terminals of a printed wiring board and reduce the number of bus-bars and tab-terminals of a wiring board assembly by a method wherein the wiring board assembly is housed between an upper cover and a lower cover and the printed wiring board is housed between the wiring board assembly and the upper cover. SOLUTION: A printed wiring board 30 is placed on a wiring board assembly 23 and a main cover (upper cover) 21 is put on it. Pressure welding terminals 41 and 42 pierce through the printed wiring board 30 and, together with pressure welding terminals 31 on the printed wiring board 30, are used as fuse connection terminals to which the terminals of fuses 8 are connected. Further, the tab terminals 43 of the wiring board assembly 23 and tab terminals 36 protruding downward from the printed wiring board 30 are made to protrude into a connector housing 47a through the terminal protruding holes 48 of the bottom wall of an under cover (lower cover) 22 to provide an I/O connector 47 on the lower surface of a junction block (wire junction box) 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric connection box such as a junction block mounted on a vehicle, and more particularly to an electric connection box in which a printed circuit board forming an electronic circuit is incorporated.

[0002]

2. Description of the Related Art FIGS. 4 and 5 show an example of a conventional junction block of this type. This junction block accommodates a bus bar wiring board 3 between a main cover (upper cover) 1 and an under cover (lower cover) 2 which are locked to each other, and a printed circuit board 10 is provided on the upper surface of the main cover 1.
Is mounted and a printed circuit board cover 12 for protecting the printed circuit board 10 is placed on it. The main cover 1 is provided with a fuse mounting portion 5, and the fuse mounting portion 5 includes
Terminals 4 and 7 extended from the bus bar wiring board 3 are set.

By fitting the fuse 8 in the fuse mounting portion 5, the bus bar wiring board 3 and the fuse 8 are electrically connected. Further, tab terminals 9 project upward from the busbar wiring board 3 so as to pass through the main cover 1, and these tab terminals 9 are fitted into relay terminals 11 provided on the printed circuit board 10 so that the printed circuit board 10 and the busbar are The wiring board 3 is electrically connected.

In this example, as shown in FIG. 5, the fuse 8 and the printed circuit board 10 are electrically connected to each other via the bus bar 6 of the bus bar wiring board 3, and the fuse 8 is connected to the printed circuit board via the bus bar 6. Power is supplied to 10. Further, the tab terminal 14 of the input / output connector is formed on the bus bar 13 of the bus bar wiring board 3, and the tab terminal 9 and the relay terminal 11 formed at one end of the bus bar 13 are formed.
By connecting the above, the input / output path between the printed circuit board 10 and the external connector is formed.

[0005]

As described above, conventionally, the printed circuit board 10 is connected to the fuse 8 and the printed circuit board is connected to the input / output connector via the bus bar of the bus bar wiring board 3. Therefore, bus bars 6 and 13 for relaying and tab terminals 9 are required, and a large number of relay terminals 11 must be provided on the printed circuit board 10.
Not only does the cost increase, but there is a problem that the circuit forming efficiency of the printed circuit board 10 and the bus bar wiring efficiency of the bus bar wiring board 3 are low.

In view of the above circumstances, it is an object of the present invention to provide an electrical junction box which allows the elimination of relay terminals on a printed circuit board and the reduction of bus bars and tab terminals in a wiring board assembly.

[0007]

According to a first aspect of the present invention, a wiring board assembly having a wiring path formed by at least one of a bus bar and an electric wire is housed between an upper cover and a lower cover, and the wiring board is provided. A printed circuit board is housed between the assembly and the upper cover, and a fuse connection terminal to which a terminal of a fuse mounted on a fuse mounting portion of the upper cover is coupled is provided on the printed circuit board.

In this electric connection box, when the printed circuit board is housed inside the upper cover, the fuse mounted on the upper cover and the printed circuit board are directly connected to each other without passing through the circuit of the wiring board assembly, and Since the connector terminals provided on the I / O directly configure the input / output connector without passing through the circuit of the wiring board assembly, the tab terminal of the wiring board assembly and the printed board can be connected on the printed board. There is no need to intentionally install the relay terminal of. Therefore, since the relay terminal can be omitted, the board surface of the printed board can be effectively used, and more circuits can be formed on the printed board. Further, since the bus bar connecting the printed circuit board and the fuse, the printed circuit board and the external connector to each other, the tab terminal, or the electric wire for the relay can be omitted, the wiring efficiency of the bus bar of the wiring board assembly can be improved. Further, the cost can be reduced by omitting the relay terminal and the bus bar.

According to a second aspect of the present invention, there is provided the electrical connection box according to the first aspect, wherein the printed circuit board is provided with a connector terminal to be coupled with an external connector, the connector terminal penetrating the wiring board assembly. It further protrudes to the outside, and an input / output connector is formed on the protruding portion.

In this electric connection box, the printed circuit board can be directly connected to a mating connector which is connected to the bottom surface of the electric connection box.

According to a third aspect of the present invention, there is provided the electrical junction box according to the first or second aspect, wherein the connector terminal penetrates a peripheral wall of the upper case and protrudes to the outside. Is configured.

In this electric connection box, the printed circuit board can be directly connected to a mating connector which is connected to the side surface of the electric connection box.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1A is a partial cross-sectional view showing a schematic configuration of the junction block 20 of the embodiment in an assembled state, and FIG. 1B is a detailed view showing the relationship between the fuse 8 and the pressure contact terminals 31, 42 therein. , Fig. 2 shows the same junction block 2
0 is an exploded perspective view.

The junction block 20 comprises a main cover 21, an under cover 22, a wiring board assembly 23 and a printed circuit board 30 housed between the main cover 21 and the under cover 22. here,
The printed circuit board 30 is attached to the main cover 21 and the wiring board assembly 2
By disposing the board cover between the board 3 and the board 3, the board cover used conventionally is abolished.

The main cover 21 includes an upper wall 21a and a peripheral wall 21.
The upper wall 21a is provided with a fuse mounting portion 21f which is close to one side. The under cover 22 includes a bottom wall 22 a and a peripheral wall 22 b, and the peripheral wall 21 of the main cover 21 is provided outside the peripheral wall 22 b of the under cover 22.
b is covered. The main cover 21 and the under cover 22 are mutually locked by a lock mechanism (not shown) in the closed state as shown in FIG.

On the lower surface of the bottom wall 22a of the under cover 22, a frame-shaped connector housing portion 47a for forming a connector is provided in a protruding manner, and the connector housing portion 47a.
A terminal projecting hole 48 is provided on the bottom wall 22a inside.

The wiring board assembly 23 is formed by sequentially stacking the busbar wiring board 25 as the lowermost layer, the busbar wiring board 25 as the upper layer, and the electric wire wiring wiring board 24 as the upper layer. The bus bar wiring board 25 is obtained by arranging a bus bar 25b of a predetermined route on an insulating plate 25a. A circuit of a predetermined route is configured by wiring 24b. The wiring board assembly 23 constitutes a predetermined wiring path as a whole by stacking the bus bar wiring board 25 and the electric wire wiring board 24. Wiring board assembly 23 may of course be entirely configured with bus bar wiring board 25. Further, it does not matter if the busbar wiring board 25 and the electric wire laying wiring board are arranged above and below the layers.

The wiring board assembly 23 includes an undercover 22.
Is inserted inside and is laminated on the bottom wall 22a, and the printed circuit board 30 is placed thereon. In this case, the uppermost wiring board 24 of the wiring board assembly 23 is provided with a small prismatic boss portion 27 projecting at an appropriate position, and the printed circuit board 30 is placed on the upper end surface of the boss portion 27. Assembly 23
Is supported with a predetermined gap between them.

The main cover 21 is covered from above, and the printed board 30 is pressed by a pressing convex portion 52 protruding from the inner surface of the upper wall 21a of the main cover 21 so as not to float. As shown in FIG. 2, the printed circuit board 30 is provided with pressure contact terminals (fuse connection terminals) 31 for connecting the terminals 8a of the fuses 8, and pressure contact terminals 41, 4 provided on the bus bar wiring board 25.
A penetrating slit 32 for penetrating 2 is provided.

On the printed circuit board 30, tab terminals (corresponding to connector terminals, which may be pin terminals) 36 for forming input / output connectors 47 on the lower surface of the junction block 20 are provided so as to project downward. . In addition, the junction block 20 is provided on the side of the printed circuit board 30.
A tab terminal (corresponding to a connector terminal, which may be a pin terminal) 37 for forming the input / output connector 38 on the side surface of the is protrudingly provided in the lateral direction. The former is a bottom plate 22a of the under cover 22 that penetrates the wiring board assembly 23 in the assembled state.
Of the terminal projecting hole 48. The latter is housed in a connector housing 38a that fits into the cutout 39 in the peripheral wall 22b of the main cover 21 in the assembled state.

Then, the printed circuit board 30 is placed on the wiring board assembly 23, and the main cover 21 is covered and locked onto the printed circuit board assembly 23, so that the pressure contact terminals 41 and 42 penetrate the printed circuit board 30 and print. Pressure contact terminal 3 on substrate 30
1, together with 1, constitutes a fuse connection terminal for connecting the terminal of the fuse 8. Further, the tab terminals 43 of the wiring board assembly 23 and the tab terminals 36 protruding downward on the printed circuit board 30 protrude into the connector housing portion 47a from the terminal protrusion holes 48 of the bottom wall 22a of the under cover 22. Thus, an input / output connector 47 is formed on the lower surface of the junction block 20.

Next, the operation will be described.

In this junction block 20, since the printed circuit board 30 is housed between the main cover 21 and the under cover 22 together with the wiring board assembly 23, a dedicated board cover is not required, and the cost can be reduced accordingly. . Further, since the printed circuit board 30 and the fuse 8 are directly connected without the bus bar of the wiring board assembly 23, and the tab terminals 36 and 37 provided on the printed circuit board 30 constitute an input / output connector, the printed circuit board It is possible to omit the relay terminal provided on the board 30, the bus bar and the tab terminal for relay. Therefore, since the relay terminal can be omitted, the board surface of the printed board 30 can be effectively used, and more circuits can be formed on the printed board 30. In addition, as the bus bar for relay is unnecessary,
The degree of freedom of the circuit configuration on the wiring board assembly 23 side is also increased.

The connection of the input / output external connector to the printed circuit board 30 is performed by the junction block 20.
If the connector 47, 38 on the bottom surface or the side surface of the connector is connected, the printed board can be directly connected to the external connector without the bus bar wiring board 25 or the like. FIG. 3 simply shows the circuit configuration of the junction block 20. As shown in this figure, there is a bus bar circuit portion 81 on the upstream side of the fuse 8 and a printed circuit board portion 82 on the downstream side of the fuse 8.
And an electric wire wiring portion 83. And the printed circuit board section 8
2 and the electric wire wiring portion 83 are connected to the unit or the connector without the bus bar circuit portion 81.

[0026]

As described above, according to the invention of claim 1, the relay terminal provided on the printed circuit board can be omitted, and the bus bar, the electric wire and the tab terminal of the wiring board assembly connected to the relay terminal can be omitted. It can be omitted. Therefore, since the relay terminal can be omitted, the board surface of the printed board can be effectively used, and more circuits can be formed on the printed board. Further, since the bus bar connecting the printed circuit board and the fuse, the printed circuit board and the external connector to each other, the tab terminal, or the electric wire for the relay can be omitted, the wiring efficiency of the bus bar of the wiring board assembly can be improved. As a result, the cost can be reduced by omitting the relay terminal and bus bar.

According to the second aspect of the present invention, since the connector terminals formed on the printed circuit board are projected to the outside from the lower cover, the printed circuit board can be directly connected to the mating connector which is connected to the bottom surface of the electric connection box. .

According to the third aspect of the present invention, since the connector terminals formed on the printed circuit board are projected to the side of the upper case, the printed circuit board can be directly connected to the mating connector which is connected to the side surface of the electric junction box. it can.

[Brief description of drawings]

FIG. 1A is a partial cross-sectional view showing a schematic configuration of an embodiment of the present invention, and FIG. 1B is a detailed perspective view of a fuse and a pressure contact terminal portion therein.

FIG. 2 is an exploded perspective view showing the configuration of the embodiment of the present invention.

FIG. 3 is a circuit system diagram of the junction block according to the embodiment of the present invention.

FIG. 4 is a perspective view showing a schematic configuration of a conventional junction block.

FIG. 5 is a cross-sectional view showing a schematic configuration of a conventional junction block.

[Explanation of symbols]

 8 Fuse 8a Terminal 20 Junction Block (Electrical Junction Box) 21 Main Cover (Upper Cover) 21f Fuse Mounting Area 22 Under Cover (Lower Cover) 23 Wiring Board Assembly 24 Wire Wiring Wiring Board 24b Electric Wire 25 Bus Bar Wiring Board 25b Bus Bar 30 Printed circuit board 31 Pressure contact terminal (fuse connection terminal) 36,37 Tab terminal (connector terminal) 38,47 Connector

Claims (3)

[Claims] 1. A wiring board assembly having a wiring path formed by at least one of a bus bar and an electric wire is housed between an upper cover and a lower cover, and a printed circuit board is provided between the wiring board assembly and the upper cover. The electrical connection box is characterized in that the printed circuit board is provided with a fuse connection terminal for accommodating the fuse and a terminal of the fuse mounted on the fuse mounting portion of the upper cover. 2. The electrical junction box according to claim 1, wherein the printed circuit board is provided with a connector terminal to be coupled with an external connector, the connector terminal penetrating the wiring board assembly and protruding from the lower cover to the outside. An electrical junction box characterized in that an input / output connector is formed on the protruding portion. 3. The electrical junction box according to claim 1, wherein the connector terminal penetrates a peripheral wall of the upper case and projects to the outside, and the projecting portion constitutes an input / output connector. Characteristic electrical junction box.