JP2555052B2 - Electric junction box manufacturing method - Google Patents

Description

The present invention relates to a method for manufacturing an electric junction box for an automobile or the like.

[Conventional technology]

As shown in FIG. 4, the structure of a conventional electric junction box is a structure in which a plurality of layers of insulating plates 1 having bus bars 2a and 2b assembled are stacked in a lower case 3 and an upper case 4 and, if necessary, the lower case. The cover 5 and the upper cover 6 are assembled. The conventional method for manufacturing an electrical junction box is as follows. First, a busbar pattern as shown in FIG. 2 is punched out from a material and then bent, and then the bridge 7 is cut and assembled to the insulating plate 1, or the bridge 7 is assembled and then the bridge 7 is assembled. Was cut and stored in the lower case 3 and the upper case 4. As a means for assembling the busbars 2a and 2b onto the insulating plate 1, as shown in FIG.
Displacement prevention rib 9 provided on the insulating plate 1 with the locking piece 8 provided on the
And fixing holes using the holes 10 or fixing ribs protruding from the insulating plate 1 by making holes 11 on the bus bar 2 as shown in FIG.
It was fixed by 12.

[Problems to be solved by the invention]

However, in the above-described method for manufacturing the electrical junction box, the bus bars of each layer are separately assembled on the insulating plate, so that reliability in assembly is low and load on assembly equipment is large. Further, the number of steps is increased because the bus bar and the insulating plate are integrated by post processing. Further, since the dimensional accuracy of the bus bar itself and the dimensional accuracy of the insulating plate are different, it is difficult to control the product accuracy and the workability is poor.

[Means for solving problems]

The manufacturing method of the electrical junction box of the present invention was made to solve the above-mentioned problems, and several kinds of busbars formed by punching and bending the material into a shape forming an internal circuit, without cutting the bridge, It is characterized in that the bridges of the bus bars of each layer are stacked by aligning the positions of the bridges of the bus bars at a desired distance, the stacked bus bars are collectively molded with an insulating material, and then the bridges of the bus bars of each layer are cut. .

〔Example〕

The manufacturing method of the electric junction box of the present invention will be described in detail below with reference to FIGS. First, in the electrical junction box,
A bus bar is formed by punching and bending several kinds of bus bar patterns (FIG. 2 is an embodiment) for forming an internal circuit from the material (however, the bridge 7 is not cut). Next, the bus bars 2a, 2b, 2c of each layer are placed on the jig B13 shown in FIG.
Are stacked at desired intervals. At this time, in order to keep the distance between the bus bars of each layer constant, the bus bar holding pins 14a, 14b, 14c of each layer projecting from the jig B13 are used.
By changing the length of the busbar holding pins, the distance between the busbars 2a, 2b, 2c in each layer can be changed appropriately. jig
After stacking the busbars 2a, 2b, 2c of each layer on B13, jig A
Set 15 and mold the busbars stacked with an injection molding machine all at once with an insulating material.

Next, as shown in FIG. 3, the bus bar assembly 16 molded together is set on the bridge cut jig 17, and the cut pin is cut.
The bridge portion 7 of the bus bar assembly 17 is cut at once by the bridge cutting jig 19 provided with 18. Then store them in the lower case and upper case as needed.

The bridge cut is preferably performed collectively, but may be performed twice or more depending on circumstances such as the cutting position.

〔The invention's effect〕

As described above, the manufacturing method of the electrical junction box of the present invention is configured such that the bus bars of the respective layers forming the internal circuit are collectively molded with the insulating material at the desired intervals, and then the bridge cut is performed. The reliability in assembling the connection box is improved, the load on the assembly equipment is reduced, the assembly man-hour is reduced, and it becomes unnecessary to manage the product quality due to the different dimensional accuracy of the bus bar and the insulating plate.

[Brief description of drawings]

FIG. 1 is a perspective view showing how to set the bus bars of each layer on a jig, FIG. 2 is a plan view of an embodiment of the bus bar pattern, and FIG. FIG. 4 is an exploded perspective view showing the structure of a conventional electric junction box, FIG. 5 and FIG.
The figure shows a conventional structure for fixing a bus bar onto an insulating plate. 1 ... Insulation plate, 2, 2a, 2b, 2c ... Bus bar, 3 ... Lower case, 4 ... Upper case, 5 ... Lower cover, 6 ... Upper cover, 7 ... Bridge, 8 ... Locking Pieces, 9 ... Displacement prevention ribs, 10, 11 ... Holes, 12 ... Fixing ribs, 13 ... Jigs B, 14a, 14b, 14c ... Busbar holding pins, 15 ... Jigs A, 16 ... Busbar assembly, 17 …… Bridge cut jig, 18 …… Cut pin, 19 …… Bridge cut jig.

Claims (1)

(57) [Claims] 1. A plurality of bus bars formed by punching and bending a material to form an internal circuit are stacked at desired intervals by aligning the positions of the bridges of the bus bars of each layer without cutting the bridges, A method of manufacturing an electrical junction box, comprising: molding the stacked bus bars collectively with an insulating material, and then cutting the bridges of the bus bars in each layer.