JP2000139016A - Connecting structure of wiring board and manufacture of wiring board assembly - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the size a structure in which electric wires are arranged on a wiring board and the number of terminals connected to the wires. SOLUTION: Wiring boards 1-3 are laminated upon another and electric wires 4 are arranged from the lower surface of the second wiring board 2 to the lower surface of the third wiring board 3 through the upper surface of the first wiring board 1. A plurality of terminals 17 and 31 is connected to the electric wires 4 on the wiring board 1. The wires 4 are connected to bus bards 7-9 provided in the wiring boards 1-3 in the lateral direction and the terminals 10-12 and 13-15 of the bars 7-9 are protruded. The terminals 17 and 31 are arranged between the bus bars 7. A plurality of terminals are provided on a cover 20 housing the wiring board 1-3. A bus bar 23 for power supply is provided in the extension 6 of the wiring board 3 and covered with the insulating cover 20. Alternatively, the bus bar 23 is integrally formed with the cover 20. Terminals 28 for connecting fuse are formed on the bus bar 23 and terminals 31 which are paired with the terminals 28 are connected to the wires 4 on the wiring board 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wiring board connection structure in which electric wires and bus bars are routed on a plurality of wiring boards, the wiring boards are stacked, and terminals are connected to the electric wires, and a method of manufacturing a wiring board assembly. Things.

[0002]

2. Description of the Related Art FIG. 7 shows an example of a conventional wiring board connection structure. In this structure, the flexible band-shaped wiring board 60 is folded in a bellows shape, and the male terminals 61 and 62 are connected to the electric wires 6 of the wiring board 60 at the upper and lower terminals of the wiring board 60.
3 is press-connected.

The electric wires 63 are provided in parallel on the surface of an insulating resin sheet 64. Upper surface 6 of folded wiring board 60
The wiring board 60 is folded in four so that the electric wires 63 are located at 0a and the lower surface 60b. Each of the terminals 61 and 62 has a tab portion 65 on one side and a press contact portion 66 on the other side. The press contact portion 66 is pressed against the electric wire 63. The wiring board 60 is accommodated in an electric junction box (not shown) in a folded state. The tabs 66 are arranged in upper and lower connectors (not shown) of the electric connection box.

However, in the above-mentioned conventional structure, unless the electric wires 63 are located on the upper surface 60a and the lower surface 60b of the folded wiring board 60, the upper and lower terminals 61 and 62 cannot be pressed against each other. Has to be folded into four, and the length of the wiring board 60, that is, the insulating resin sheet 64 and the electric wire 63 is increased, which causes a problem that the electric connection box is enlarged and the cost is increased. In addition, in order to arrange the terminals 61 in a horizontal row (in the transverse direction of the wires) on the upper surface 60a of the wiring board 60 in correspondence with the connector portion of the main cover of the electric connection box (not shown), the number of wires depends on the width of the wiring board 60. There is a problem that the number of poles of the terminal 61 is limited by itself and is restricted.

[0005] Another conventional example shown in FIG.
No. 87653) describes a structure in which three wiring boards 72 to 74 connected by electric wires 71 are folded in a substantially self-character shape, and an electric junction box 76 for accommodating the wiring board assembly 75. In the case of the structure, even if the electric wires 71 are arranged on the upper surface of the wiring board 72, the electric wires 71 are not arranged on the lower surface of the wiring board 74, so that a downward terminal (reference numeral 62 in FIG. 7) cannot be arranged. The problem arises. When the electric wire 71 is provided inside the wiring boards 72 to 74 instead of the surface as shown in FIG. 8, it is difficult to position and fix the electric wire 71, and there is a problem that the manufacturing cost increases.

[0006] Another conventional example shown in FIG.
No. 166419), a terminal 77 on the fuse connection side is provided on the main cover 86, a terminal 79 on the load side is provided on the under cover 78, and an electric wire 80 is pressed against the press-contact portions of both terminals 77, 79. Wiring board 8 with busbar 81 as a power supply side circuit arranged between undercover 78
2, an electric connection box 87 having a structure in which a tab terminal 83 of a bus bar 81 is connected to a fuse 85 via a relay terminal 84 is shown.

However, in the case of this structure, an insulating substrate 88 is required for insulating the power supply bus bar 81 from the load side circuit and the like, and at the same time, the power supply bus bar 81 is connected to the insulating substrate 88. It was necessary to fix by means not shown, such as a groove and a welding boss. Thus, the number of components for the power supply bus bar 81 (insulating substrate 88)
Increases, the man-hour for fixing the power supply bus bar 81 to the insulating substrate 88 increases, and the electric connection box 87 increases.
However, there is a problem that the size and cost increase.

After the terminals 77 on the fuse connection side and the terminals 79 on the load side are pressed into the main cover 86 and the under cover 78, the electric wires 80 are wired (routed) by a wiring device (not shown). In order to press the wire 80, it is necessary to define the order of the wiring of the wire 80, define the press-contact position of the wire 80, and perform positioning for cutting the wire 80. When a large number of types of electric junction boxes 87 are used, a large number of wiring devices are required, and a large amount of equipment costs are required. The press-contact position of the electric wire 80 varies depending on the circuit configuration, and since the press-contact position is irregular even within one electric connection box 87, the wiring (routing) of the electric wire 80 is troublesome, and It took a lot of time to press and cut the steel.

[0009]

SUMMARY OF THE INVENTION In view of the above-mentioned points, the present invention provides a method of arranging electric wires on a wiring board and laminating the wiring boards.
In a wiring board connection structure in which terminals are connected to wires on the wiring board, the length of the wiring board and the wires can be minimized, and the terminals can be arranged on the upper and lower surfaces of the wiring board. The number of wires can be increased, the work of laying wires and the connection with terminals can be simplified, and the number of insulating substrates and the number of man-hours for fixing the bus bars for power supply can be increased due to the installation of bus bars for power supply. It is an object of the present invention to provide a connection structure of a wiring board and a method of manufacturing a wiring board assembly which can reduce the increase in the number of circuit connections by reducing the size, cost, and the number of circuit connections. .

[0010]

In order to achieve the above object, the present invention relates to a wiring board connection structure in which three wiring boards are stacked and a plurality of electric wires are routed in parallel on each wiring board. Wherein the electric wires are routed from above to the lower surface of the third layer wiring board from the lower surface of the second layer wiring board through the upper surface of the first layer wiring board. ). It is also effective that a plurality of terminals are connected to the electric wires on the first layer wiring board (claim 2). Also, a plurality of busbars are disposed on the respective wiring boards of the first to third layers in the transverse direction of the wires, terminals for external connection are formed on both sides of each of the busbars, and the wires are connected to the busbars. It is also effective to perform (claim 3). It is also effective that the plurality of terminals are arranged between the plurality of bus bars.
It is also effective that the plurality of terminals are provided on a cover that accommodates the wiring board (claim 5). It is also effective that an extension is formed on the third-layer wiring board, and a bus bar for supplying power is provided on the extension. It is also effective that the insulating cover is provided to cover the power supply bus bar (claim 7). Alternatively, it is also effective that a power supply bus bar is integrally formed with the insulating cover. A first terminal for fuse connection is formed in the power supply bus bar, and a second terminal that is paired with the first terminal is connected to the electric wire on the first layer wiring board. Is also effective (claim 9). The connection structure of the wiring board according to claim 1,
The three wiring boards are arranged on the wires at intervals, the wires are fixed to each wiring board, the front wiring board is inverted on the middle wiring board, and the front and middle wiring boards are separated. This is realized by a method of manufacturing a wiring board assembly that is integrally turned over on a rear wiring board.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 6 show an embodiment of a connection structure of a wiring board according to the present invention.

In this structure, as shown in FIG. 1, three wiring boards 1 to 3 are folded in a substantially e-shape, and the upper surface 1a of the first layer wiring board 1 and the second layer wiring board 1 2 lower surface 2b;
The electric wires 4 are continuously and linearly arranged on the lower surface 3b of the third-layer wiring board 3. The electric wire 4 is routed from the front end 2 c to the rear end 2 d of the second-layer wiring board 2, and the first bent portion 4
a, and is wired to the first layer wiring board 1, and each of the wiring boards 1 to 3
Are routed through the second bent portion 4b at the front end of the wiring board 3 to the rear end 3d of the third-layer wiring board 3.

An extension 6 is integrally formed at the rear of the third-layer wiring board 3 with an upward step 5 interposed therebetween. Extension 6
Is located at the same height as the upper surface 1a of the wiring board 1 of the first layer. An intermediate portion in the longitudinal direction of the electric wire 4 is disposed on the upper surface 1a of the first layer wiring board 1. A plurality of electric wires 4 are linearly arranged in parallel at equal pitch. As the electric wire 4, a covered electric wire or an enameled wire covered with an insulating resin is used. The electric wire 4 functions as a circuit on the load side.

Each of the wiring boards 1 to 3 is provided with a plurality of bus bars 7 to 9 in a direction orthogonal to the electric wires 4. The bus bars 7 to 9 are insert-molded integrally with the insulating resin substrates 34 to 36, and are used as circuits on the load side. A circuit on the load side is constituted by both the electric wire 4 and the bus bars 7 to 9. The busbars 7 to 9 of each layer are completely wrapped in the vertical direction, and upward tab terminals (terminals) 10 to 12 for external connection are integrally formed at one end of each of the busbars 7 to 9. Downward tab terminals (terminals) 13 to 15 for external connection are integrally formed with the other terminals 7 to 9. The bus bars 7 and 9 of the first layer wiring board 1 and the third layer wiring board 3 can be commonly used by being inverted. The tips of the tab terminals 10 to 12 and 13 to 15 are located at the same height. Although not shown, a plurality of bus bars 7 to 9 similar to the above are arranged in parallel on each of the wiring boards 1 to 3. The bus bars 7 to 9 are connected to the electric wire 4 by means such as welding.

Near the front end of the wiring board 1 of the first layer, a pair of front and rear terminal insertion holes 16 and 16 are provided. A press-contact portion 19 of a male terminal 17 is inserted into each terminal insertion hole 16 and 4
The pressure contact portion 19 is press-connected. Each terminal insertion hole 16 is arranged so as to avoid the bus bar 7 (not shown) near the front end of the first-layer wiring board 1. It is also possible to arrange each terminal insertion hole 16 between a plurality of bus bars 7 provided in parallel in the front-back direction of the wiring board 1.

The terminal 17 has a connection tab 18 on the upper side and a press contact 19 on the lower side. The terminal 17 is, for example, previously inserted into a main cover 20 (FIG. 6) described later by a method such as press fitting or insert molding. A pair of front and rear terminal insertion holes 1
The electric wire 4 is cut between 6 and 16. One electric wire 4 is divided into separate circuits by the electric wire cutting part 22. An intermediate portion in the longitudinal direction of the electric wire 4 is located on the first layer wiring board 1, and the electric wire 4 is cut at a substantially intermediate portion of the entire length.

When the electric wire 4 is almost at the middle position of the entire length, each terminal 17
And each terminal 17,
Many circuits are branched or connected to 31 via the bus bars 7 to 9 and the like. In this example, since the number of the terminals 17 is two before and after the wire cutting portion 22 of one wire 4, the wires 6 on the upper surface of the conventional wiring board 60 (FIG. 7) are used.
As compared with the case where one terminal 61 is arranged at three terminals, twice as many terminals 17 are arranged. In addition, corresponding to the terminal 62 on the lower surface side of the conventional wiring board 60 (FIG. 7),
It is also possible to dispose a downward terminal (not shown) on the third-layer wiring board 3 of this example.

A substantially L-shaped bus bar 23 for supplying power is provided on the upper surface of the extension 6 on the rear side of the third-layer wiring board 3. The bus bar 23 has a large upward tab terminal 26 on a short side portion 24 thereof, and a tuning fork-shaped downward holding terminal 27 for relay connection located near the tab terminal 26. It has an upward holding terminal (first terminal) 28 for fuse connection. The downward holding terminal 27 is inserted into the slit hole 29 of the extension 6.

A relay connection terminal 30 is inserted into the extension 6 from below, adjacent to the holding terminal 27. Terminal 30 is
Pressing portion 49 for electric wire 4 and holding portion 5 for relay
0. The terminal 30 is previously inserted in, for example, an under cover 21 (FIG. 6) described later. Further, the upward holding terminals 28 for fuse connection are arranged at the same intervals as the electric wires 4 on the first layer wiring board 1.

Near the rear end of the first-layer wiring board 1, a terminal (second terminal) 3 for fuse connection is opposed to the holding terminal 28.
1 are arranged in parallel. The terminal 31 has a holding portion 32 for a tab terminal of a fuse (not shown) and a press contact portion 33 for the electric wire 4. The terminal 31 is previously inserted into, for example, a main cover 20 (FIG. 6) described later by a method such as press fitting or insert molding. A terminal insertion hole 59 for wire pressure welding is provided in the first layer wiring board 1 for the terminal 31.
The terminal insertion holes 59 are arranged so as to avoid the bus bars 7 of the first-layer wiring board, like the terminal insertion holes 16 on the front side. It is also possible to arrange the terminal insertion holes 59 between a plurality of parallel bus bars 7. Since the upper surface 1a of the first-layer wiring board 1 and the upper surface of the extension 6 of the third-layer wiring board 3 are located at the same height, the holding terminals 28 and the holding portions 32 of the terminals 31 are located in front and rear. It is arranged facing.

The terminal 31 is, for example, a conventional terminal 61 (FIG. 7).
The number of terminal connections in the wiring board assembly C is increased not only by the terminals 17 on the front end side of the first-layer wiring board 1 but also by the terminals 31. Terminal 3
1 is also connected to the middle part in the longitudinal direction of the electric wire. Each of the wiring boards 1 to 3 includes an insulating resin substrate 34 to 36 and a bus bar 7 to
9, each of the wiring boards 1 to 3, the electric wire 4, and each terminal 1
The assembly of 7, 30, 31 and the bus bar 23 constitutes a wiring board assembly C.

FIG. 2 shows an example of a method of manufacturing the wiring board assembly C. A plurality of electric wires 4 are laid on a base 37 linearly and in parallel at an equal pitch. The wiring boards 2 to 3, the first wiring board 1, and the third wiring board 3 are placed in this order on the first wiring board 1 to 3 with a space therebetween. The electric wires 4 are fixed to the bottom surfaces of the wiring boards 1 to 3 by, for example, bonding. Next, the wiring board 2 of the second layer on the tip side is turned over by 180 ° in the folding direction as shown by the arrow A, and is stacked on the wiring board 1 of the first layer. Furthermore, the second and first layer wiring boards 2,
1 is integrally turned over in the folding direction as shown by the arrow B and is superimposed on the wiring board 3 of the third layer.

As a result, as shown in FIG. 3, three wiring boards 1 to 3 are laminated in the order of the first layer wiring board 1, the second layer wiring board 2, and the third layer wiring board 3 from the top. You. The electric wire 4 passes through the upper surface of the first layer wiring board 1 from the lower surface of the second layer wiring board 2 through the first bending portion 4a on the rear end side, and the second bending portion 4b on the front end side.
And reaches the lower surface of the extension 6 along the lower surface of the wiring board 3 of the third layer.

FIG. 4 shows the arrangement of the bus bars 7 and the electric wires 4 on each wiring board (only the first wiring board 1 is shown in FIG. 4). Are insert-molded into the first-layer wiring board 1 in a state of being integrated via the joint 38. Bus bar cutting holes 39 and electric wire connection holes 40 are provided in required portions of each wiring board (the first layer wiring board 1 in FIG. 4). The bus bar 7 is cut and divided at a required bus bar cutting hole 39 by a press punching machine (not shown) or the like. At the same time, the required joint 38 of the bus bar 7 is cut and removed. Thereby, a large number of bus bar circuits are formed.

The electric wire 4 is connected and fixed to the exposed portion 7a of the bus bar 7 of the electric wire connection hole 40 by welding or the like. As shown in FIG. 5, the electric wire 4 is welded to the back surface of the exposed portion 7 a of the bus bar 7 in the electric wire connection hole 40 by the upper and lower electrodes 41 and 42. Branch connection or the like is performed by the bus bar 7 or the electric wire 4. After welding the electric wire 4 to the bus bar 7, the electric wire 4
(See the electric wire cutting portion 22 in FIG. 1).
The cutting of the bus bars 7 to 9 of the wiring boards 1 to 3 (FIG. 1) and the welding of the electric wires 4 to the bus bars 7 to 9 are performed as shown in FIG.
3 is developed in a planar manner.

The above steps will be described in a time series manner. First, joints 38 and unnecessary portions of the bus bars 7 to 9 of the first to third wiring boards 1 to 3 are cut (FIG. 4). Each of the bus bars 7 to 9 is used as a circuit on the load side. Next, the wiring boards 1 to 3 are arranged on the electric wires 4 in a straight line (FIG. 2). Then, the electric wire 4 and required portions of the bus bars 7 to 9 are connected by welding means (FIG. 5). Thereafter, unnecessary portions of the electric wire 4 are cut. The electric wire 4 is used as a circuit on the load side similarly to the bus bars 7 to 9. Next, the wiring boards 1 to 3 are stacked in a substantially e-shape using the electric wires 4 as hinges (FIG. 3), and the wiring board assembly C is configured (FIG. 1).

Next, the wiring board assembly C is housed inside the main cover 20 and the under cover 21 as described later with reference to FIG. The first-layer wiring board 1 at the center in the longitudinal direction of each of the wiring boards 1 to 3 developed in a plane in FIG.
The wire 4 is automatically pressed into contact with the terminals 17 and 31 of the main cover 20 at the same time as the main cover 20 is assembled.

FIG. 6 shows a state in which a wiring board assembly C is housed between a main cover (cover) 20 which is a connection box body made of a synthetic resin and an under cover 21 to form an electric connection box E. It is.

The main cover 20 has a first connector portion 43 for supplying power near the rear end, a fuse accommodating portion 44 in front of the first connector portion 43, and a rectangular second connector portion on one side. 45, a rectangular third connector portion 46 is formed near the front end. The under cover 21 is provided with a relay connector 47 below the first connector 43 and a fourth connector 48 symmetrically with the second connector 45 on the other side.

Terminals 17, 30, 31 pressed against electric wire 4
Are previously fixed to the main cover 20 and the under cover 21 by press fitting or insert molding. The wiring board assembly C is housed in the under cover 21, and the main cover 20 is assembled to the under cover 21.
And the upper surface of the extension 6 of the third-layer wiring board 3 are located substantially in contact with the back surface of the main cover 20, that is, the main cover fitting surface. As a result, the terminals 17 and 30 on the side of the main cover 20 are press-connected to the electric wires 4 of the first-layer wiring board 1. The holding portion 32 of the terminal 31 is located in the cavity 44 a of the fuse accommodating portion 44.

The bus bar 23 for power supply is routed and fixed, for example, on the upper surface side of the extension 6 of the wiring board 3 of the third layer. The main cover 20 is fitted in the same step as the step of arranging the power supply bus bar 23. Bus bar 23 for power supply
Is clamped and fixed between the rear surface of the main cover 20 and the upper surface of the extension portion 6. This eliminates the need for fixing means (not shown) such as a welding boss to the power supply bus bar 23. A bus bar guide groove (not shown) may be formed on the upper surface side of the extension portion 6. In this case, the upper surface of the power supply bus bar 23 is pressed and fixed to the rear surface of the main cover 20.

As another embodiment, the power supply bus bar 23 may be fixed inside the main cover 20. For example, a bus bar guide groove (not shown) is formed on the back surface side of the main cover 20, and a bus bar 23 for supplying power is fixed in the bus bar guide groove.

Alternatively, the power supply bus bar 23 is fixed to the main cover 20 by integral molding such as insert molding. It is possible to expose the lower surface of the power supply bus bar 23 to the same surface as the rear surface of the main cover 20. However, the power supply bus bar 23 is provided inside the upper wall 52 of the main cover 20. 3 side bus bar 7
It is preferable to completely bury the same as in No. 9 to No. 9. In this case, the front and back surfaces of the bus bar 23 for power supply are insulated and protected by the main cover 20 made of insulating resin, and the insulation to the load side circuit such as the electric wire 4, the bus bars 7 to 9 and the other terminals 17, 30, 31 is ensured. In addition, the extension 6 of the third-layer wiring board 3, which is a wiring board for the power supply bus bar 23, becomes unnecessary.

Tab terminal 26 of bus bar 23 for power supply
The holding terminals 27 and 28 protrude vertically from the upper wall 52 of the main cover 20. It is also possible to insert-mold the power supply bus bar 23 on the under cover 21 instead of the main cover 20, and in this case also, the same effect as described above, such as the extension 6 of the third-layer wiring board 3 becomes unnecessary. Needless to say.

Tab terminal 26 of power supply bus bar 23
Is located in the cavity 43a of the first connector portion 43,
The holding terminal 28 for fuse connection is located in the cavity 44 a of the fuse accommodating portion 44. Nipping terminal 28 and terminal 31
Are located in the same cavity 44a.
Each clamping terminal 28 and each terminal 31 is a fuse (not shown)
Are arranged at the same pitch. A ground-side tab terminal (not shown) facing the tab terminal 26 is provided separately from the bus bar 23. At the same time when the main cover 20 is assembled, the bus bar 23 for supplying power is arranged on the extension 6 of the third-layer wiring board 3. The downward holding terminal 27 of the power supply bus bar 23 and the downward holding portion 50 of the terminal 30 are located inside the relay insertion portion 47 of the under cover 21.

The upward tab terminals 10 to 12 of the bus bars 7 to 9 of each of the wiring boards 1 to 3 are located in the second connector portion 45 of the main cover 20, and the downward tab terminals 13 of the bus bars 7 to 9 are provided. 15 are located in the fourth connector portion 48 of the under cover 21. Further, the tab portions 18 of the pair of front and rear terminals 17 pressed against the electric wires 4 of the first layer wiring board 1 are located at the cavities 46 a of the third connector portion 46.

The first connector portion 43 is connected to a power supply side wire harness (not shown) by a connector, and includes a tab terminal 26 of the bus bar 23, a clamping terminal 28, a fuse (not shown), and the first layer wiring board 1. Is supplied to the electric wire 4 and one terminal 17 on the wiring board 1 of the first layer. Further, electricity is supplied from the electric wire 4 to the bus bar 7 via the welding portion 51 (FIG. 5). The second, third, and fourth connector portions 45, 46, and 48 are respectively connected by connectors to external wire harnesses (not shown).

[0038]

As described above, according to the first and tenth aspects of the present invention, electric wires are positioned on the upper surface of the first wiring board and the lower surface of the third wiring board using three wiring boards. Even if the upward terminal connected to the electric wire is arranged on the first wiring board and the downward terminal connected to the electric wire is arranged below the third wiring board, the conventional four-fold The wiring length of the electric wires and the total length of the wiring board can be shortened by substantially one wiring board as compared with the above wiring board. As a result, the structure is made more compact and the cost is reduced as compared with a conventional four-folded wiring board. Also, compared to the conventional structure in which the electric wires are integrally formed on three wiring boards, the work of arranging and fixing the electric wires is easier and the manufacturing cost is reduced.

According to the second aspect of the present invention, since the intermediate portion in the longitudinal direction of the electric wire is located on the first wiring board, by arranging a plurality of terminals on the first wiring board, Compared with the case where the terminals are arranged at the terminal of the conventional wiring board (terminal of the electric wire), the number of connected terminals is increased, thereby increasing the number of circuit connections and adapting to various circuit connection forms. In particular, by using a terminal having a press-contact portion, it is possible to arrange a large number of terminals in the middle portion of the electric wire, thereby increasing the wiring density of the circuit and making it possible to reduce the size of the electric junction box as a whole. Further, by connecting the terminals to the parallel and straight electric wires, the connection work between the electric wires and the terminals is facilitated as compared with the related art (FIG. 9), and the productivity of the electric junction box is improved. According to the third aspect of the invention, branching is enabled by connecting the bus bar to the electric wire, and the terminal of the bus bar can be connected to an external wire harness or the like. Thereby, connection forms are diversified, and it becomes possible to adapt to various specifications of the electric connection box. In addition, by configuring the load-side circuit with both the electric wire and the bus bar, the wiring (routing) work of the electric wire is simplified and facilitated as compared with the load-side circuit using only the conventional electric wire, and the wiring is performed. Equipment costs are reduced.

According to the fourth aspect of the present invention, the terminals can be arranged at a regular pitch between the plurality of parallel bus bars without interference with the bus bars, and the connection work between the terminals and the electric wires can be performed. The performance is improved. Further, the terminals can be arranged at desired positions among the plurality of bus bars, thereby increasing the degree of freedom of the connection positions between the electric wires and the terminals. According to the fifth aspect of the present invention, by covering the wiring board with the cover, the terminals and the electric wires are automatically connected by, for example, press-contact means, and the connection work is saved. Claim 4
By arranging the terminals at desired positions, the position of the connector portion of the cover can be set at a desired position, and the degree of freedom in designing the electric connection box is improved.

According to the sixth aspect of the present invention, since the power supply bus bar is provided at the extension of the third-layer wiring board, a dedicated wiring board as in the prior art is not required, and the structure is improved. Is reduced in size and cost. According to the seventh aspect of the present invention, the power supply bus bar is sandwiched and fixed between the extension of the third-layer wiring board and the cover, so that the conventional locking projection or welding boss can be used. There is no need for fixing means or fixing work, and the structure is simplified and the cost is reduced.
According to the eighth aspect of the present invention, the conventional dedicated wiring board for the power supply bus bar or the extension of the third-layer wiring board of the sixth aspect is completely unnecessary, so that the structure can be made compact and low. In addition to cost reduction, there is no need to fix the power supply bus bar at all, which reduces the number of manufacturing steps and ensures that the power supply bus bar is insulated by the cover. Even if not, first-
The insulation with the load side circuit such as the electric wire and the bus bar of the wiring board of the third layer is performed more reliably. According to the ninth aspect of the present invention, electricity is supplied to the electric wire from the bus bar via the first and second terminals, and the intermediate portion of the electric wire is connected to the second terminal on the first-layer wiring board. . Thereby, Claim 2
Similarly to the above, the number of terminals connected in the middle portion of the electric wire increases, and it is possible to adapt to various circuit connection forms.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an embodiment of a wiring board connection structure according to the present invention.

FIG. 2 is a side view illustrating an example of a method for manufacturing a wiring board assembly.

FIG. 3 is a side view showing a state where each wiring board is inverted and assembled.

FIG. 4 is a perspective view showing a wiring state of bus bars on a wiring board;

FIG. 5 is a longitudinal sectional view showing one connection method of a bus bar and an electric wire.

FIG. 6 is an exploded perspective view showing a state in which the wiring board assembly is housed in a connection box main body.

FIG. 7 is an exploded perspective view showing a conventional example.

FIG. 8 is an exploded perspective view showing another conventional example.

FIG. 9 is an exploded perspective view showing another conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 First-layer wiring board 2 Second-layer wiring board 3 Third-layer wiring board 4 Electric wire 6 Extension 7-9 Busbar 10-12,13-15 Tab terminal (terminal) 17 Terminal 20 Main cover (cover) 23 bus bar for power supply 28 clamping terminal (first terminal) 31 terminal (second terminal)

Claims (10)

[Claims] In a connection structure of a wiring board in which three wiring boards are stacked and a plurality of electric wires are routed in parallel on each of the wiring boards, the electric wires are connected from above to a lower surface of the second-layer wiring board. A wiring board connection structure, which is routed through the upper surface of the first layer wiring board to the lower surface of the third layer wiring board. 2. The wiring board connection structure according to claim 1, wherein a plurality of terminals are connected to the electric wires on the first layer wiring board. 3. A plurality of bus bars are arranged on each of the first to third wiring boards in a direction transverse to the electric wires, terminals for external connection are formed on both sides of each of the bus bars, and the bus bars are provided with the terminals. 3. An electric wire is connected.
The connection structure of the described wiring board. 4. The wiring board connection structure according to claim 3, wherein the plurality of terminals are arranged between the plurality of bus bars. 5. The wiring board connection structure according to claim 4, wherein the plurality of terminals are provided on a cover that houses the wiring board. 6. The wiring according to claim 1, wherein an extension is formed on the third-layer wiring board, and a bus bar for supplying power is provided on the extension. Board connection structure. 7. The power supply bus bar, wherein the insulating cover is provided to cover the power supply bus bar.
The connection structure of the described wiring board. 8. The wiring board connection structure according to claim 1, wherein a power supply bus bar is formed integrally with said insulating cover. 9. A first terminal for fuse connection is formed on the power supply bus bar, and a second terminal paired with the first terminal is provided on the electric wire on the wiring board of the first layer. The connection structure for a wiring board according to claim 6, wherein 10. Three wiring boards are arranged on an electric wire at an interval, the electric wires are fixed to each of the wiring boards, the front wiring board is turned over on the intermediate wiring board, and the front side and the intermediate Wherein each wiring board is integrally turned over on a rear wiring board.