JPH0357058Y2 - - Google Patents

Description

[Detailed Description of the Invention] Purpose of the Invention [Industrial Field of Application] The present invention relates to an improvement of a busbar wiring board that constitutes an internal circuit in a branch junction box used, for example, in automobile wiring.

[Conventional technology and problems]

A busbar wiring board is composed of a busbar having branch tabs and its wiring board, and is usually used by laminating a plurality of layers. An example of this will be explained in detail with reference to the drawings. In FIG. 4, 1 is a first layer busbar having four branch tabs A, B, C, and D;
It is arranged on the first layer wiring board 2 ₁ . Branch tab A,
B extends upward, and downward branching tabs C and D pass through tab through holes 3 and 3' provided in the first layer wiring board 2 ₁ and the second and third layer wiring boards 2 ₂ and ₂ 3. Protrudes to the lower layer. As a means for connecting the first layer bus bar 1 to the external male terminal 4 for power supply, a female-female relay terminal 5 is used to connect the branch tab A and the external male terminal 4, for example.

As described above, in the conventional busbar wiring board, the relay terminal 5 is required to connect the busbar 1 and the external male terminal 4, resulting in an increase in the number of parts and an increase in contact resistance.

Furthermore, since the downward branching tabs C and D penetrate through the second and third layer wiring boards 2 ₂ and 2 ₃ , the second and third layer bus bars (not shown) are arranged to avoid the penetrating portions. As a result, the degree of freedom in arranging busbars is reduced, and the arrangement efficiency (density) is also reduced.

The present invention has been made in view of these problems, and aims to provide a busbar wiring board having a structure that does not require relay terminals, as well as improving the freedom and efficiency of busbar arrangement.

Structure of the invention [Means for solving the problems] In order to achieve the above object, the present invention provides a busbar wiring board in which a plurality of busbars having branch tabs and a wiring board are laminated. By arranging the branch tabs of the bus bar and the branch tabs of the second and lower bus bars rising from the lower layer in close proximity to each other, and by inserting the external male terminal between the branch tabs arranged opposite to each other. It is characterized in that the busbars in the first layer and the second layer and below are electrically integrated.

[Effect]

According to the present invention, for example, the first layer busbar 1 having four branch tabs A, B, C, and D shown in FIG.
As shown in Figure 1, two branch tabs A',
busbar 11 with B and three branch tabs A'',
The bus bar 11' having C and D can be formed separately, and the circuit pattern of the bus bar is simplified.

If the branch tabs C and D of the bus bar 11' are to protrude downward from the lowest layer wiring board 12 ₃ , the bus bar 11' is connected to the third layer wiring board 12 ₃ .
At the same time, a branch tab C, is provided only on the plate ₁₂₃ .
A tab through hole 13' for D may be provided. That is, the bus bar 11' has almost no effect on the bus bar disposed on the second layer wiring board ₁₂₂ .

In order to electrically conduct bus bars 11 and 11', select branch tabs A' and A'' facing the same direction, arrange them facing each other, and curve one branch tab A' so that it is elastic together with branch tab A''. Holding part 15 (second,
3) and inserting the external male terminal 4 directly into the part 15. The conventional relay terminal 5 (FIG. 4) is no longer required.

〔Example〕

In FIG. 1, the bus bar 11 is the simplest type of bus bar, and has branch tabs A' and B bent in the same direction at both ends, and one branch tab A' has its center curved a. This gives it elasticity.

The bus bar 11' has three branch tabs A'', C, and D, and at least one of these branch tabs (A'')
is a branch tab having a curved portion a of the bus bar 11;
It is formed in the same direction as A′.

12 ₁ , 12 ₂ and 12 ₃ are first, second and third layer wiring boards, respectively, and the first layer wiring board 12 ₁ has a wiring groove 1 for the bus bar 11.
4 is recessed, and tab through holes 13 are provided in the first and second layer wiring boards 12 ₁ and 12 ₂ close to the ends of the grooves 14 . In addition, the third layer wiring board 12 ₃
has tab through holes 1 for the branch tabs C and D.
3' is provided.

The busbar wiring board is assembled, for example, as follows.

The bus bar 11 is placed and fixed in the placement groove 14 of the first layer wiring board 12 ₁ by press-fitting or using an adhesive. At this time, the curved branch tab A' is positioned on the tab through hole 13 side.

Next, the second layer bus bar and wiring board 12 ₂
Set the branch tab of the third layer bus bar 11'.
A'' is made to protrude through the tab through hole 13, and finally, the third layer wiring board ₁₂₃ is set, and the branch tabs C and D are made to protrude downward from the tab through hole 13'.

As a result, as shown in FIG. 2, the curved branch tab A' and the opposing branch tab A'' form an elastic clamping part 15, so that the external male terminal 4 is attached to the elastic clamping part 15.
If you insert it, the first and third layer bus bars 1
1 and 11' are electrically connected and electrically integrated,
An equivalent circuit is formed with the bus bar 1 shown in FIG.
The external male terminal 4 may be either a power supply side terminal or a ground side terminal.

The above describes the integration of the busbar 11 having two branching tabs A', B and the busbar 11' having three branching tabs A'', C, D. (A′, A″)
As long as at least one branch tab is provided, the number of other branch tabs can be increased or decreased, and at least one of the opposing branch tabs (A', A'') is curved a to accept the external male terminal 4 of the other party. In addition, busbars in different layers can be integrated without being affected by the number of stacked wiring boards or the position (layer) in which the busbars are arranged.

Effects of the invention As explained above, the busbar wiring board of the invention makes it possible to form a busbar with a complex circuit pattern spanning multiple layers by dividing it into two or more simplified busbars. The degree of freedom and efficiency of arrangement can be improved, and there is no need to use a relay terminal for connection with an external male terminal.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view showing an embodiment of the busbar wiring board of the present invention, Figs. 2 and 3 are sectional views of the main parts of the same assembled state, and Fig. 4 is an exploded perspective view of a conventional example. be. 11, 11'... bus bar, 12 ₁ , 12 ₂ , 1
2 ₃ ... (first, second, third layer) wiring board, 13,
13'...Tab through hole, 15...Elastic clamping part.

Claims (1)

[Claims for Utility Model Registration] (1) In a busbar wiring board formed by laminating a plurality of busbars having branch tabs and a wiring board,
The branch tab of the bus bar of the layer and the second one rising from the lower layer
By arranging the branch tabs of the busbars in the lower layers facing each other in close proximity to each other, and inserting external male terminals between the branching tabs arranged oppositely, the busbars in the first layer and the second layer and lower layers are arranged. A busbar wiring board characterized by being electrically integrated. (2) The bus bar wiring board according to claim 1, wherein at least one of the opposing branch tabs is curved to form an elastic clamping portion.