JPH0756567Y2 - Electrical junction box - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to an electric junction box used for wiring inside a vehicle.

[Prior art]

Electric connection boxes for automobiles are generally punched from a conductor plate such as a copper plate, and a bus bar formed into a required circuit pattern by bending, by laminating a plurality of layers via an insulating plate,
It is housed in a plastic case, and the electric wires, fuses, relays, etc. are interconnected by the bus bar.

Figures 3 and 4 show the basic structure of a conventional electrical junction box. In FIG. 4, 11a to 11d are first-layer bus bars, 11
e to 11h are second layer bus bars, 12a is first layer insulating plate, 12b
Is an insulating plate of the second layer. A stack of these bus bars and insulating plates is housed in a case 13 shown in FIG. The case 13 is formed with a fuse mounting portion 14, a relay mounting portion 15, a coupler 16 to which a connector at the end of the wire harness is connected, and the like.
Is on, and on this tab 7, fuse 18 and relay
The 19 terminals are designed to come into contact with each other.

[Problem] With the recent increase in the number of automobile electrical components, such an electric junction box has the following problems. In other words, the size of the electric junction box is limited due to the space of the installation location, and if the number of electrical components of the automobile increases under such restrictions, the number of fuses, relays, and other parts will increase, and the bus bar circuit in the electric junction box will increase. Also has a higher density. as a result,
The heat generation of the bus bar and the heat generation of the electric parts and their connecting parts due to the energization increase, and the abnormal temperature rise easily occurs. When the abnormal temperature rise occurs, there arises a problem that a part of the plastic case is melted and the functions of the fuse and the relay are impaired.

Regarding the heat generation of the bus bar, it is possible to increase the thickness and width of the bus bar to reduce the electrical resistance, but increasing the thickness of the bus bar is a constraint because of workability and connectivity with the connector. Also, increasing the width of the busbar leads to an increase in the wiring area of the busbar, which leads to an increase in the size of the electrical junction box.Therefore, this is also a solution for electrical junction boxes that are limited in overall size. It's hard to be.

[Means for solving the problem and its action]

In view of the above problems, an object of the present invention is to provide an electric junction box in which the temperature rise of the bus bar is suppressed.

In order to achieve this object, the present invention provides an electrical junction box in which a plurality of busbars formed in a required circuit pattern are laminated through an insulating plate and housed in a case. A bus bar with insufficient capacity, on a conductor plate that does not form a circuit provided in a layer different from the bus bar,
At least one of the bus bar and the conductor plate is provided with an insulating plate penetrating portion so that they are brought into contact with each other.

The reason why the temperature of the bus bar rises is that the thermal capacity is insufficient for heat generation due to energization, heat generation at the contact portion with the component, and the like. Therefore, if the bus bar whose thermal capacity is insufficient as described above is contacted with the conductor plate provided in another layer, the thermal capacity of the bus bar increases and the heat of the bus bar diffuses to the conductor plate. Therefore, the temperature rise of the busbar can be suppressed.

〔Example〕

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

FIG. 1 shows an embodiment of the present invention. This example is shown in FIG.
And in the electrical junction box shown in Fig. 4, the bus bar 11c
It shows the countermeasures when the temperature rise is large.

That is, in this electric connection box, the insulating plate 12a is attached to the bus bar 11c.
The insulating plate penetrating portion 21 is formed by penetrating the insulating plate penetrating portion 21 and the conductor plate 22 is installed therein by utilizing the space between the bus bars 11g and 11h of the second layer. Are contacted. The conductor plate 22 can be formed of the same copper plate as the bus bar. As a result, the heat of the bus bar 11c is diffused to the conductor plate 22, so that the temperature rise of the bus bar 11c is suppressed.

The insulating plate penetrating portion 21 can be provided not only at one location on the bus bar 11c but also at a plurality of locations. Insulation plate penetration
21 may be formed on the conductor plate 22 side instead of on the bus bar 11c.

FIG. 2 shows another embodiment of the present invention. This example shows
In the electric connection box shown in FIG. 3 and FIG.
It shows the measures to be taken when the temperature rises of c, 11d, 11e, and 11h are large.

As described above, when there are many bus bars with a large temperature rise, it is difficult to install the conductor plate in the space between the bus bars. Therefore, in this electrical junction box, a third-layer insulating plate 12c is provided, and conductor plates 22c, 22d, 22e, 22h corresponding to the respective bus bars are provided on the insulating plate 12c, and the bus bars 11c, 11d, 11e are respectively provided on the insulating plates 12c. , 11h insulation plate penetration 21
It is made by contacting c, 21d, 21e, and 21h.

[Effect of device]

As described above, according to the present invention, since the bus bar, which has a low thermal capacity and a large temperature rise, is brought into contact with the conductor plates provided in the other layers, the thermal capacity of the bus bar is increased. , The heat of the bus bar will diffuse to the conductor plate. Therefore, the temperature rise of the bus bar is suppressed, and it is possible to eliminate the functional failure of the fuses and relays and the melting and deformation of the case and the cover due to the temperature rise.

[Brief description of drawings]

1 and 2 are exploded perspective views showing a laminated state of a busbar in an electric junction box according to an embodiment of the present invention, respectively.
FIG. 3 is an external perspective view showing the basic configuration of a conventional electrical junction box, and FIG. 4 is an exploded perspective view showing the busbar laminated state of the same electrical junction box. 11a to 11h: Bus bar, 12a to 12c: Insulation plate 13: Case, 21: Insulation plate penetration, 22: Conductor plate

Claims (1)

[Scope of utility model registration request] 1. An electric junction box in which a plurality of busbars formed in a required circuit pattern are laminated via an insulating plate and housed in a case. Among the busbars, a busbar lacking thermal capacity. An electrical junction box, characterized in that an insulating plate penetrating portion is provided on at least one of the bus bar and the conductor plate, and is brought into contact with a conductor plate that does not form a circuit provided in a layer different from the bus bar.