JPH0923539A - Electric connection box for common use in hi-lo grade - Google Patents

Abstract

PROBLEM TO BE SOLVED: To use the cases and the parts in common to any of Hi and Lo grades, in an electric connection box used for the electric wiring of an automobile. SOLUTION: A plurality of wiring boards accommodated in a case are composed of a stacked bus bar wiring board, where two or more layers of bus bar wiring boards are stacked, and a pressure-welded terminal wiring board 24 which is interposed between the lowermost bus bar wiring board 23' and the lower case 22 and besides in which a desired pattern is made, with its pressure-welded terminal press-fitted in the hole of an insulating supporting board 33 and with its pressure-welded terminal having a covered cable welded in the slot of the pressure-welded terminal. The lowermost bus bar wiring board is a both-sided bus bar wiring board 23' where bus bars are arranged on both upside and downside of an insulating board 28. This is arranged so that the number of bus bars on the downside of the both-sided bus bar wiring board and the number of patterns of the pressure-welded wiring board can be increased or reduced, according to the grades of Hi and Lo.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a Hi-Lo grade shared electric junction box, and more particularly, to a circuit that can be easily changed when changing the grade without changing the outer shape or dimensions of the case.

[0002]

2. Description of the Related Art Various electrical connection boxes such as fuse boxes, relay boxes, and branch connection boxes are used for interconnecting wire harnesses (automotive electric wires) and protecting circuits. The structure of such an electric junction box is generally configured by stacking a plurality of busbar wiring boards each including a plurality of busbars and their insulating substrates in a case and using a printed wiring board together with the busbar wiring board. In some cases.

FIG. 9 (A) shows an example of a conventional Hi grade electric junction box, in which four layers of bus bar wiring boards 3 ₁ , 3 ₂ ... 3 ₄ are stacked and housed in an upper case 1 and a lower case 2. Each wiring board is composed of a plurality of bus bars 4 and an insulating substrate 5 supporting them, and the number and pattern of bus bars in each layer and the insulating substrate on which the bus bars are mounted are dedicated.

FIG. 9 (B) is an example of the Lo grade electric connection box used in the same vehicle model of FIG. 9 (A), and includes optional equipment and circuits such as a rearview mirror, an assist control unit, and a motor antenna ignition. It becomes unnecessary. Therefore, the wiring board inside the electrical junction box does not require, for example, the fourth layer of the four-layer laminated wiring boards 3 _{1 to} 3 ₄ in FIG. 9A. Therefore, when abolish unnecessary busbar wiring board 3 _4, because the gap V is generated as shown in FIG. 9 (B), the
In order to eliminate this, it is necessary to newly install the upper case 1'or the lower case 2'or a new four-layer laminated board having a different pattern, which is very costly.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and when changing the circuit from Hi to Lo or from Lo to Hi, the case, the insulating substrate and other parts are changed. You can easily change the circuit without
An object is to provide a Hi-Lo grade shared electrical junction box that helps reduce production costs.

[0006]

In order to achieve the above-mentioned object, according to the present invention, as described in claim 1, a plurality of wiring boards are housed in an insulating case and are derived from the circuit of each wiring board. In an electrical junction box formed by projecting a terminal group into a fuse cavity, a relay cavity, or a connector receiving portion provided in the case, the plurality of wiring boards are two layers of busbar wiring boards each including a plurality of busbars and an insulating substrate thereof. The laminated bus bar wiring board laminated as described above, and the press contact terminal is press-fitted and fixed in the hole of the insulating support plate, which is interposed between the lowermost bus bar wiring board of the laminated bus bar wiring board and the lower case. And a press-contact terminal wiring board in which a desired pattern is formed by press-connecting an electric wire to the slot, and the busbar wiring board in the lowermost layer is a double-sided busbar in which busbars are arranged on the upper and lower surfaces of the insulating substrate. Is formed as a bar wiring board, employing the changeable providing constituting the number of patterns of the lower surface of the bus bar number and the press contact terminal wiring board in Hi and Lo the double-sided busbar wiring board corresponding to the grade. Further, the increase or decrease in the number of electric wires pressed in the press contact terminal wiring board or the circuit change is performed in accordance with the increase or decrease of the Hi-Lo grade bus bar on the lower surface of the double-sided bus bar wiring board (claim 2).

In the present invention, an internal circuit for a Hi grade car is constructed by using a laminated bus bar wiring board whose bottom layer is a double-sided bus bar wiring board and a pressure contact terminal wiring board, and when the circuit is changed from Hi to Lo, The bus bar on the back surface of the double-sided bus bar wiring board is eliminated or eliminated, and the number of patterns of the pressure contact terminal wiring board is reduced.
Therefore, the size of the insulating substrate to be laminated, the number of layers, and parts such as a case for accommodating these can be shared, and the production cost can be reduced. The same applies when changing the circuit from Lo to Hi. Also, by selecting the number of busbars on the back surface of the double-sided busbar wiring board to be increased or decreased, and the pattern and the number of patterns of the pressure contact terminal wiring board, various circuit changes can be made.

[0008]

1 is an explanatory view showing the principle of the present invention, in which an upper case 11 and a lower case 12 are provided.
Two single-sided busbar wiring boards 13 ₁ and 13 ₂ and one double-sided busbar wiring board 13 ′ are stacked and housed, and a pressure contact terminal wiring board 14 is housed underneath. Then, the busbars 15 _{1 of} the first and second layer busbar wiring boards 13 ₁ and 13 ₂ are
Group, 15 ₂ group and 3rd layer busbar 15 ₃ group of double-sided busbar wiring board 13 'and part 16a of electric wire pattern 16 of pressure contact terminal wiring board 14 constitute an internal circuit for Lo grade. Fourth layer bus bar 15 ₄ group of wiring board 13 ₃ and remaining portion 16 of the electric wire pattern 16
An internal circuit for Hi grade is formed by adding b. Therefore, it is possible to immediately form the Lo grade electric junction box by omitting the fourth layer bus bar group 15 ₄ and the remaining portion 16b of the electric wire pattern 16.

FIG. 2 is a perspective view showing a state where the Hi-Lo grade common electric junction box A according to the present invention is separated upside down.
In the figure, 21 is an upper case made of a synthetic resin insulator, 22 is a lower case, and two single-sided busbar wiring boards 23 ₁ and 23 ₂ and one double-sided busbar wiring board 23 ′ are stacked and housed inside. In addition, the pressure contact terminal wiring board 2 is provided between the double-sided bus bar wiring board 23 ′ and the lower case 22.
4 are interposed.

Further, a plurality of connector receiving portions 25 for connecting connectors (neither shown) of the terminals of the wire harness are provided in both cases 21 and 22, and a fuse cavity is provided in the upper case 21. 26 and a relay cavity 27 are provided, and tabs and press contact terminals of bus bars, which will be described later, are projected as connector terminals into the connector receiving portion 25 and the cavities 26 and 27.

The third double-sided bus bar wiring board 23 'is
A plurality of bus bars 29 are provided on both upper and lower surfaces of the insulating substrate 28. Each bus bar 29 is formed in advance with a predetermined pattern by punching or bending a metal plate,
Busbar mounting grooves 28a matching the pattern of each busbar 29 are provided on both surfaces of the insulating substrate 28.
The bus bar 29 is positioned by the bus bar mounting groove 28a so that the surface of the wiring board is flush.

FIG. 3 shows a group of fourth-layer bus bars 29 arranged on the lower surface of the double-sided bus bar wiring board 23 '. Each bus bar 2
9 has a predetermined pattern, and an upward tab 30 or a downward tab 30 'is connected to an end portion or an intermediate portion of the predetermined pattern.
These tabs pass through the tab through holes 28b of the insulating substrate 28 as necessary to project into the connector receiving portion 25, the cavity 26 and the like. Further, like a bus bar indicated by reference numeral 29 ', an electric wire 40 of a pressure contact terminal wiring board 24 described later is provided.
In some cases, a pressure contact piece 31 having a slot (electric wire press-fitting groove) 31a is provided in order to be directly connected to the pressure contact piece 31a.

Two single-sided bus bar wiring boards 23 ₁ ,
23 ₂ and the structure on the front surface side of the double-sided bus bar wiring board 23 'are
Since a predetermined bus bar is arranged in the bus bar mounting groove on the surface of the insulating substrate, it is the same as the case of the fourth layer bus bar 29 group, and the description thereof will be omitted.

In FIGS. 2, 4 and 5, reference numeral 33 is an insulating support plate of the pressure contact terminal wiring board 24, and two wiring blocks 33A and 33B are formed on both the left and right sides thereof.
In each wiring block, a plurality of electric wire housing grooves 34 are juxtaposed along the longitudinal direction with a partition wall 35 interposed therebetween. Each wire housing groove 34 is provided with a press-fitting hole 36 for a press contact terminal 39 at a desired position, and at least an intermediate portion and one end of each wire housing groove 34 are provided with a wire locking portion 37. The wire locking portion 37 is formed as a tapered protrusion that faces the partition walls 35, 35 on both sides that form the groove wall of the wire housing groove 34.

Two wiring blocks 33A and 33B are also provided.
On the opposite side, the wire shift prevention portion 38 is provided at the end of each wire receiving groove 34. This wire shift prevention portion 38
Is an electric wire hooking pin 38a and a mounting base 3 for supporting it.
8b, and the mounting base 38b is erected so as to face the partition wall 35. Although the mounting base portion 38b has the same height as the partition wall 35, the height of the wire hooking pin 38a is set sufficiently higher than that of the partition wall 35.

The pressure contact terminal wiring board 24 is assembled in the following manner. First, the insulating support plate 33 is arranged on a wiring plate (not shown). On this insulating support plate, the wire shift preventing portions 6, 6 of the two wiring blocks 33A and 33B are arranged as described above.
Are facing each other. Next, the press-fitting holes 36 of the respective wire accommodating grooves 34
The male terminal portion 39a of the press contact terminal 39 is press-fitted and fixed to the press contact portion 39b having the slot (electric wire press-fit groove) 39c protruding from the upper surface. In this state, a wiring head (not shown) is used to connect the two wiring blocks 33A, 3A.
The electric wire 40 is pressed against a desired pressure contact terminal 39 between 3B to form a circuit pattern.

FIG. 6A shows Hi assembled in this way.
The wiring pattern for grade is shown, and (B) shows the wiring pattern for Lo grade.

Each of the electric wires 40 is press-fitted and fixed in the slot 39c of the press-connecting terminal 39 in the electric wire receiving groove 34, and the electric wire locking portion 37 at the intermediate portion and at least one end portion.
Since it is clamped and fixed to and is locked at at least 3 places,
There is almost no risk of floating or shifting from the wire receiving groove 34. In addition, since the electric wires 40 that are wired so as to intersect between the wiring blocks 33A and 33B are sorted by the electric wire hooking pins 38a of the electric wire shift prevention portion 38 of each block, the electric wires 40 are cut not only during the wiring but also after the wiring. Even if there is no slack or slack, erroneous wiring such as overlapping wiring can be avoided.

FIG. 7 is a wiring diagram showing a part of the Hi grade circuit of the electric junction box according to the present invention, and FIG. 8 is a wiring diagram showing a part of the corresponding Hi grade circuit. As shown in Fig. 8, even if the same car model is used, RADI
O (radio power supply), CLOCK (clock power supply), MOTO
R ANT (motor, antenna power supply), RR MTR
ANT (Rear right antenna power supply), COLUM SW
WIP (column switch wiper), etc. are common circuits. These common circuits are composed of the two single-sided busbar wiring boards 23 ₁ and 23 ₂ and the double-sided busbar wiring board 23 ′.
Of the pressure contact terminal wiring board 24 (see 16a in FIG. 1 and FIG. 6B).

In the Hi-grade wiring diagram of FIG. 7, ROOM MIR (room mirror), HORN (horn), AS C / U (assist control unit), MOTOR ANT I
G (motor antenna ignition), ALT R
Circuits for optional equipment such as LY (alternator relay), F; IGN (ignition switch), etc. are added. These additional circuits are composed of the bus bar 29 on the rear surface side of the double-sided bus bar wiring board 23 'and the remaining pattern of the press contact terminal wiring board 24 (see 16b in FIG. 1 and FIG. 6 (a)).

[0021]

As described above, according to the present invention, an internal circuit for a Hi-grade vehicle is constructed by using a laminated bus bar wiring board having a double-sided bus bar wiring board as the lowermost layer and a pressure contact terminal wiring board. When changing the circuit from Lo to Lo, the bus bar on the back surface of the lowermost double-sided bus bar wiring board can be totally eliminated or reduced, and the number of patterns of the pressure contact terminal wiring board can be reduced. Therefore, the size of the insulating substrate to be laminated, the number of layers, and parts such as a case for accommodating these can be shared, and the production cost can be reduced. The same applies when changing the circuit from Lo to Hi. Also,
A wide variety of circuits can be changed by selecting the number of busbars on the back surface of the bottom double-sided busbar wiring board to be increased or decreased, and the pattern and the number of patterns of the pressure contact terminal wiring board.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing the principle of the present invention.

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

FIG. 3 is an enlarged perspective view of a fourth layer bus bar of FIG.

FIG. 4 is an enlarged plan view of a main part of the electric wire wiring board of FIG.

5A is an enlarged perspective view of a main part of FIG. 4, and FIG. 5B is a cross-sectional view of a wiring state of an electric wire.

[FIG. 6] (A) Wiring pattern for Hi grade, (B)
Is the wiring pattern for Lo grade.

FIG. 7 is a wiring diagram for Hi grade.

FIG. 8 is a wiring diagram at Lo grade.

FIG. 9A is an explanatory view of a conventional Hi grade electric junction box, and FIG. 9B is an explanatory view of a Lo grade electric junction box.

[Explanation of symbols]

 A Hi-Lo grade common electrical junction box 21 Upper case 22 Lower case 23 Single-sided busbar wiring board 23 'Double-sided busbar wiring board 24 Pressure contact terminal wiring board 25 Connector receiving part 26 Fuse cavity 27 Relay cavity 28 Insulation board 29 Busbar 33 Insulation support board 36 Hole 39 Pressure contact terminal 39c Slot 40 Electric wire

Claims (2)

[Claims] 1. An electrical connection box comprising a plurality of wiring boards housed in an insulating case, and a group of terminals derived from the circuit of each wiring board protruding into a fuse cavity, a relay cavity or a connector receiving portion provided in the case. In the above, the plurality of wiring boards is a laminated busbar wiring board in which two or more layers of busbar wiring boards each including a plurality of busbars and an insulating substrate thereof are stacked, a busbar wiring board that is the bottom layer of the laminated busbar wiring board, and the lower case. And a press-connecting terminal wiring board having a desired pattern formed by press-fitting and fixing a press-connecting terminal in a hole of an insulating support plate and press-connecting an electric wire to a slot of the press-connecting terminal, The bottom-layer busbar wiring board is formed as a double-sided busbar wiring board in which busbars are arranged on both upper and lower surfaces of an insulating substrate. The number of bus bars on the lower surface of the wire board and the number of patterns of the pressure contact terminal wiring board can be increased or decreased.
Lo grade common electric junction box. 2. The lower surface of the double-sided bus bar wiring board
The common electric junction box for Hi-Lo grade according to claim 1, wherein the number of electric wires to be crimped on the crimping terminal wiring board is increased or decreased or the circuit is changed according to the increase or decrease of the bus bar of Hi-Lo grade.