JPH0448097Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an electrical junction box for automobiles.

[Prior art]

Electrical junction boxes for automobiles usually have a structure in which a lower case and an upper case house busbars stacked in multiple layers with insulating plates in between. A system has also been adopted in which the power supply system uses a bus bar and the signal system uses a printed circuit board.

When using a printed circuit board, it is necessary to connect the printed circuit board to the bus bar and to connect the printed circuit board to an external circuit. The connection between a printed circuit board and a bus bar is made by soldering a female terminal to a copper foil circuit on the printed circuit board and inserting a tab that stands upright from the bus bar into the female terminal. Additionally, the connection between the printed circuit board and the external circuit is accomplished by soldering the connector terminal to the printed circuit board upright, protruding the tip of the terminal outside the case, and connecting the external circuit connector there. It is being said.

〔assignment〕

However, in such a structure, the insulating board of the printed circuit board and the case are made of different materials, and due to the difference in shrinkage rate and thermal expansion coefficient between the two, the soldering part between the printed circuit board and the female terminal, and the soldering part between the printed circuit board and the connector terminal. Unreasonable stress is likely to be generated in the soldered portion of the connector, and external force is also likely to be applied to the soldered portion when a busbar tab or connector is inserted or removed, which poses a problem in terms of reliability.

[Means for solving problems and their effects]

The present invention provides an electrical connection box that solves the problems of the prior art as described above, and its configuration is as follows:
A bus bar is housed in a first case, a film circuit board is pasted on the inner surface of a second case facing the bus bar, and a female terminal electrically connected to the film circuit board is fixed. The base of a connector terminal that is electrically connected to the film-like circuit board and whose tip protrudes outside the second case is embedded and fixed in the second case, and the first case and the second case are combined. A tab standing upright from the bus bar is inserted into the female terminal to electrically connect the bus bar and the film-like circuit board.

The present invention uses a film-like circuit board (an insulating film with a circuit pattern formed on one or both sides, and is flexible) and attaches it to the second case to integrate it. Eliminates relative misalignment between the case and the circuit board. Furthermore, the female terminal into which the tab of the bus bar is inserted is also fixed to the second case to prevent excessive force from being applied to the connection between the film-like circuit board and the female terminal. Furthermore, the base of the connector terminal is embedded and fixed in the second case to prevent excessive force from being applied to the connection portion between the film-like circuit board and the connector terminal.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 and FIG. 2 show an embodiment of the present invention. This electrical junction box includes a first case (lower case) 1, a second case (upper case) 2 facing it, and a third case (side case) 3 attached to the side thereof. ing.

A multilayer bus bar 4 is housed in the first case 11 with an insulating plate 5 interposed therebetween. From the bus bar 4, a tab 4a stands upright in the connector receiving portion 1a of the first case 1, and a tab 4b stands upright toward the second case 2 side. These structures are almost similar to conventional electrical junction boxes.

Next, a film-like circuit board 6 is pasted on the inner surface of the second case 2, and a female terminal 7 is fixed by adhesive, fitting, screwing, or the like. The female terminal 7 is a film-like circuit board 6
and are electrically connected by soldering or the like. The second case 2 also includes a connector terminal 8 whose tip protrudes into the connector receiving portion 2a of the second case 2.
The base is embedded and fixed. This connector terminal 8 is also electrically connected to the film-shaped circuit board 6. In order to integrate the second case 2, the film-like circuit board 6, the female terminal 7, and the connector terminal 8 in this way, the female terminal 7 and the connector terminal 8 are
It is preferable to set the film-shaped circuit board 6 to which the second case 2 is attached in a mold for molding the second case 2, and to integrate it simultaneously with the molding of the second case 2. Electronic components are mounted on the film-like circuit board 6, but illustration of the electronic components is omitted.

When the first case 1 and second case 2 configured as described above are combined, the tab 4b of the bus bar 4 is inserted into the female terminal 7, and the bus bar 4 and the film-shaped circuit board 6 are electrically connected. The state will be as follows.

The third case 3 is provided as necessary, and the tab 4c of the bus bar 4 protrudes into the connector receiving portion 3a.

[Effect of idea]

As explained above, in the electrical junction box according to the present invention, a film-shaped circuit board is stuck to the inner surface of the second case and is integrated, and the female terminal connecting the film-shaped circuit board and the bus bar is connected to the second case. The connector terminal that connects the film circuit board and the external circuit is fixed to the second case, and the base of the connector terminal is embedded and fixed in the second case. This has the advantage that unreasonable force is not applied to the connection between the shaped circuit board and the connector terminal, and reliability is significantly improved.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an electrical connection box according to an embodiment of the present invention, and FIG. 2 is a perspective view of the connection box. 1...first case, 2...second case, 3
...Third case, 4...Bus bar, 5...Insulating plate, 6...Film-shaped circuit board, 7...Female terminal,
8... Connector terminal.

Claims (1)

[Scope of utility model registration request] A bus bar is housed in a first case, a film circuit board is pasted on the inner surface of a second case facing the bus bar, and a female terminal electrically connected to the film circuit board is fixed. The base of a connector terminal that is electrically connected to the film-like circuit board and whose tip protrudes outside the second case is embedded and fixed in the second case, and the first case and the second case are combined. and an electrical connection box, characterized in that a tab standing upright from the bus bar is inserted into the female terminal to electrically connect the bus bar and the film-like circuit board.