JP2000134766A - Electrical connection box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance degrees of freedom or the like of a terminal position, that is, an input/output position in an electronic circuit board side. SOLUTION: A bus-bar wiring plate 2 having first terminals 91 to 97 protruding from a bus bar 8, an electronic circuit board 3, and a cover 5 having connector parts 131 to 136 receiving the first terminal, are provided. An input/output circuit board 4 is arranged between the bus-bar wiring plate 2 and the electronic circuit board 3, the input/output circuit board 4 houses a bus bar 17, second terminals 121 to 125 are formed in one of the bus bar 17, a connection terminal 18 is formed in the other of the bus bar 17, the second terminals 121 to 125 are positioned to be inserted in the bus bar wiring plate, and the connection terminal 18 is connected to the electronic circuit board 3. The second terminals 121 to 125 are arranged in parallel to the first terminals 91 to 95. The bus bar 17 is molded in the input/output circuit board 4. A stress-absorbing part 19 is formed in the connection terminal 18.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric connection box mounted on a motor vehicle and having a bus bar wiring board and an electronic circuit board, wherein an input / output circuit board is arranged between the bus bar wiring board and the electronic circuit board. Thus, the degree of freedom in terminal layout and the like is increased.

[0002]

2. Description of the Related Art FIG. 4 shows an example of a conventional electric junction box. The electric connection box 41 includes a bus bar wiring board 42 in which a plurality of sheets are stacked, a main cover 43 and an under cover 44 that cover the bus bar wiring board 42 from above and below, and a fuse cover that covers a fuse mounting portion 45 in the first half of the main cover 43. 46, an electronic circuit board 47 attached below the front half of the under cover 44, a sub cover 48 for covering the electronic circuit board 47, and a connector cover 49 for covering the rear half of the under cover 44.

The busbar wiring board 42, the main cover 43, and the undercover 44 form a connection box main body, and the electronic circuit board 47 and the sub cover 48 form an electronic control unit. A relay mounting section 50 and a connector mounting section (connector section) 51 are formed in the rear half of the main cover 43. The bus bar wiring board 42 is connected to the insulating plate 52 by the bus bar 5.
The bus bar 53 has tab terminals 54 projecting up and down. A relay terminal (female-female terminal) 57 is attached to the tab terminal 56 of the fuse 55 and the tab terminal of the bus bar 53 for a relay (not shown). The tab terminals 54 of the bus bar 53 protrude from the connector 51 of the main cover 43 and the connector (not shown) of the under cover 44.

Various electronic components 59 are soldered to a circuit section 58 of the electronic circuit board 47. The circuit section 58 is connected to a wire harness (not shown) via a connector section 60 on the sub cover 48 side. Harness is main cover 4
3 and the connector portions 51 and 61 of the under cover 44.

[0005]

Conventionally, the function of the electronic circuit board 47 was small, and the number of connecting circuits between the bus bar wiring board 42 and the electronic circuit board 47 was small. As the function of the electronic circuit board 47 increases due to the increase in the number of electronic components 59, the circuit connecting the bus bar wiring board 42, ie, the connection box main body 62, and the electronic circuit board 47, ie, the electronic control unit 63, as shown in FIG. There has been a tendency for the number of connectors 64 and the number of circuits 65 and connectors directly output from the electronic circuit board 47 to increase.

However, in the above-described conventional structure, the position and the direction of the output circuit 65 from the electronic circuit board 47 are limited according to the form of the wire harness (not shown). To return to the bus bar wiring board 42 once.
The number of circuits 66 for outputting a signal from a wire harness from the device is increased. Also, the bus bar wiring board 42
Since the number of circuits 66 for returning to the
The circuit on the side increases, the connection box main part 62 becomes large, the connection fitting force of each connector between the connection box main part 62 and the electronic control unit 63 increases, and the connector connection workability deteriorates. A problem occurred.

Further, as shown in FIG. 6, the wire harness 68 is formed by assembling a plurality of sub-wire harnesses 69 to 71. However, many man-hours are required to assemble the sub-wire harnesses 69 to 71. If the sub-wire harnesses 69 'to 71' can be connected to the electric connection box 41 'as shown in FIG. 7, the number of steps for assembling the sub-wire harnesses 69 to 71 can be reduced. In the connection box 41, the sub-wire harness (sub-wire harness 69) is formed because the connector portion 51 on the bus bar wiring board 42 and the connector portion 60 on the electronic circuit board 47 are separately arranged. '-71'), the configuration of the wire harness 68 was complicated as shown in FIG. 6, and the productivity of the wire harness 68 was deteriorated. 6 and 7, reference numerals 41 and 41 'denote electrical junction boxes, and 63 and 63' denote electronic control units.

In view of the above, the present invention reduces the number of connection circuits between a bus bar wiring board and an electronic circuit board, and temporarily returns the circuit from the electronic circuit board to the bus bar wiring board to output from the bus bar wiring board. Eliminate waste of wire harnesses, improve the efficiency of connector connection work, and take a terminal arrangement that matches the form of the sub-wire harness. It is intended to provide an electrical junction box that can be obtained.

[0009]

To achieve the above object, the present invention provides a bus bar wiring board having a first terminal protruding from a bus bar, an electronic circuit board, and a connector for accommodating the first terminal. An input / output circuit board disposed between the bus bar wiring board and the electronic circuit board, wherein the input / output circuit board has a built-in bus bar, and a bus bar is provided on one of the bus bars. A second terminal is formed,
A connection terminal is formed on the other side of the bus bar, the second terminal is located through the bus bar wiring board, and the connection terminal is connected to the electronic circuit board (claim 1). . It is also effective that the second terminal is arranged in parallel with the first terminal (claim 2). It is also effective that the bus bar is molded on the input / output circuit board. It is also effective that a stress absorbing portion is formed in the connection terminal (claim 4).

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 3 show one embodiment of an electric junction box according to the present invention.

As shown in FIG. 1, the electric connection box 1 includes a bus bar wiring board 2 in which a plurality of bus bar wiring boards are stacked, and an electronic circuit board 3 disposed below the bus bar wiring board 2 and in parallel with the bus bar wiring board 2. The input / output circuit board 4 which is located between the bus bar wiring board 2 and the electronic circuit board 3 and performs input / output of the electronic circuit board 3, and accommodates the bus bar wiring board 2, the input / output circuit board 4 and the electronic circuit board 3. And a main cover 5 and an under cover 6 made of synthetic resin.

[0012] bus bar wiring board 2 is made by arranging a plurality of bus bars 8 on the insulating substrate 7, the bus bar 8 upward tab terminal (first terminal) 91 _to 93 ₇ and down tab terminal (terminal ) and a 9 _8. Bus bar wiring board 2 ₂ intermediate and lower, 2 ₃ upward tab terminal 91 _to 93 ₇ penetrates the busbar wiring board 2 ₁ through hole 10 of the upper, upper and intermediate bus bar wiring board 2 _1, 2 ₂ downward tab terminals 9 ₈
It extends through the hole (not shown) of the bus bar wiring board 2 ₃ lower.

Further, the bus bar wiring board 2, a predetermined position, i.e., upward tab terminal 91 _to 93 of the insulating substrate 7 ₆
Terminal insertion hole 1 vertically penetrated at a position adjacent to and parallel to
1 is formed. Terminal insertion holes 11 are intended for protruding tab terminal 12 ₁ to 12 ₅ of the output circuit board 4 to be described later (second terminal) on the bus bar wiring board 2, the tab in the same manner as the through hole 10 and it has a slightly larger rectangular than the plate thickness and width of the terminals 12 ₁ to 12 _5.

Upward tab terminals 9 _{1 to} 9 ₇ and 12 ₁ to 1
2 in the main cover 5 corresponding to the ₅ female connector housing (connector portion) _{131-134 6} and relay mounting portion 14
Are integrally formed. Connector housing 13 ₁
To 13 upward tab terminal 9 to the engaging chamber 15 of _{6 to} 93
_6, 12 ₁ to 12 ₅ are inserted.

The input / output circuit board 4 is one in which a bus bar 17 is routed and fixed inside a synthetic resin insulating substrate 16 by integral molding. As shown in FIG.
An upward tab terminal 12 protrudes from one end of the bus bar 17, and a pin-shaped connection terminal 18 protrudes downward from the other end of the bus bar 17. The pin-shaped connection terminal 18 has a bent portion (stress absorbing portion) 19 for absorbing stress at an intermediate portion thereof. The tip 18a of the connection terminal 18 is inserted into the through hole 20 of the electronic circuit board 3 and printed by a solder 21 with a printed circuit 22 (FIG. 1).
Connected and fixed. The bending portion 19 for absorbing stress removes the stress caused by the thermal effect at the time of solder welding and the displacement between the input / output circuit board 4 and the electronic circuit board 3 and the like.
(1) Prevent cracks, etc., and ensure reliable connection at all times.

The electronic circuit board 3 and the input / output circuit board 4 are separated by a gap 23 (FIG. 2) corresponding to the length of the connection terminal 18. Between the electronic circuit board 3 and the input / output circuit board 4, support columns, ribs, and the like (not shown) are provided. The electronic circuit board 3 and the input / output circuit board 4 constitute an electronic control unit 24 (FIG. 1).

As shown in FIG. 1, the input / output circuit board 4 has various shapes.
A bus bar 17 is arranged. With this configuration,
Connection terminal 18 on printed circuit 22 of electronic circuit board 3
Tab terminal 1 via bus bar 17
2 (in FIG. 1, especially 12 _Two) Can be placed
You. As a result, one printed circuit 22 is connected to the bus bar.
-It is possible to output to a desired place on the wiring board 2.
You. Of course, a location close to the connection terminal 18 or the connection terminal 18
And a tab terminal 12 (12 in FIG. 1)₁And
12_Five) Can also be arranged.

[0018] With the above structure, the desired location of the plurality of connector housings _{131-134 6} of the main cover 5, it is possible to output the one circuit 22 with the electronic circuit board 3. In other words, it is possible to input the desired circuit 22 of the electronic circuit board 3 in any connector housing _{131-134 6.}

Thus, the connector housing 13 ₁
To 13 ₆ with connector connection in accordance with the form of an external wire harness (not shown) it is possible for, it is possible to the connector connection in the sub wire harnesses state without restricting the form of a wire harness. In addition, since the bus bar is molded on the input / output circuit board, the manufacture of the input / output circuit board is simplified and the cost is reduced.

In FIG. 1, an electronic circuit board 3 includes an insulating substrate.
The printed circuit 22 is provided on the board 29 and the printed circuit 2
2, a plurality of electronic components 25 are surface-mounted,
The component 25 includes the printed circuit 22, the connection terminal 18, and the bus bar.
17 and tab terminal 12₁~ 12 _FiveAnd through the main cover
5 connector housing 13₁~ 13_FiveFrom wire harness
The connector is connected to the nest.

Further, in response to the downward tab terminal 9 ₈ of the bus bar wiring board 2 is cut-out portion 26 is formed in the input-output circuit board 4, the connector of the female type of the electronic circuit board 3 side notches 26 housing 27 are arranged. The connector housing 27, for example, is accommodated in the female following the printed circuit 22 of the electronic circuit board 3 pin (not shown), the female terminal is connected to the downward tab terminal 9 _8, the electronic circuit The connection between the substrate 3 and the bus bar wiring board 2 is performed.

[0022] By overlapping the bus bar wiring board 2 on the output circuit board 4, together with the downward tab terminal 9 ₈ are connected are inserted into the connector housing 27 into the female terminal (not shown), upward tab terminal 12 ₁ to 12 ₅ of the output circuit board 4 is inserted into each terminal insertion hole 11 of the bus bar wiring board 2, the tab terminals 91 _to 93 ₅ of the bus bar wiring board 2 through the bus bar wiring board 2 Project upward in parallel with and at the same height.

Electronic control unit 24 and bus bar wiring board 2
Are accommodated in the under cover 6, and the main cover 5 is covered by the under cover 6. Thus, as shown in FIG. 3, the tab terminals 91 _to 93 _5, 12 ₁ to 12 ₅ is accommodated in the connector housing _{131-134 6,} the connector portion 28 _{1-28 6} of the main cover 5 is formed You.

[0024]

As described above, according to the first aspect of the present invention, the number of connections between the bus bar wiring board and the electronic circuit board is reduced by replacing a part of the bus bar wiring board with the bus bar of the input / output circuit board. As a result, the efficiency of the connector connection work, the simplification of the structure of the electric connection box, and the cost reduction can be achieved. Also, by using the input / output circuit board,
Terminals (second terminals) on the electronic circuit board side can be arranged at desired locations with respect to the bus bar wiring board, and connection parts for input / output of the electronic circuit board can be set to any connector part on the cover. can do. In this way, by increasing the degree of freedom in the layout of the terminals on the electronic circuit board side, it is possible to take a terminal layout that matches not only the wire harness but also the form of the sub-wire harness. Correspondingly, the productivity of the wire harness is improved.

According to the second aspect of the present invention, the first terminal on the bus bar wiring board side and the second terminal on the electronic circuit board side can be arranged in the same connector portion on the cover. The first terminal and the second terminal can be connected simultaneously with one connector part of the wire harness, thereby diversifying the circuit connection form and reducing the number of connector connections, and the connector connection work. Is more efficient. According to the third aspect of the present invention, the manufacturing of the input / output circuit board is simplified and the cost is reduced by molding the bus bar. According to the fourth aspect of the present invention,
The stress absorption part of the connection terminal absorbs distortion and deformation,
The displacement between the input / output circuit board and the electronic circuit board, that is, the displacement between the bus bar wiring board and the electronic circuit board, can be dealt with,
A reliable electrical connection is always possible.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing one embodiment of an electric junction box according to the present invention.

FIG. 2 is a longitudinal sectional view showing a main part of an input / output circuit board.

FIG. 3 is a perspective view showing an assembled state of the electric junction box.

FIG. 4 is an exploded perspective view showing a conventional electric junction box.

FIG. 5 is a circuit diagram of a conventional electric junction box.

FIG. 6 is an explanatory diagram showing a connection state of the wire harness.

FIG. 7 is an explanatory diagram showing an ideal form of a connection state of a wire harness.

[Explanation of symbols]

1 electrical connection box 2 bus bar wiring board 3 electronic circuit board 4 output circuit board 5 main cover 8,17 busbars 91 _to 93 ₇ tab terminal (first terminal) 12 ₁ to 12 ₅ tab terminal (second terminal) 13 _{1 to} 13 ₆ Connector housing (Connector part) 18 Connection terminal 19 Bend for stress absorption (Stress absorption part)

Claims (4)

[Claims] 1. An electric junction box comprising: a bus bar wiring board having a first terminal protruding from a bus bar; an electronic circuit board; and a cover having a connector portion for accommodating the first terminal. An input / output circuit board is disposed between the board and the electronic circuit board, the input / output circuit board has a built-in bus bar, a second terminal is formed on one of the bus bars, and a connection terminal is provided on the other of the bus bars. An electrical connection box formed, wherein the second terminal is located through the bus bar wiring board, and the connection terminal is connected to the electronic circuit board. 2. The electrical junction box according to claim 1, wherein said second terminal is arranged in parallel with said first terminal. 3. The electrical junction box according to claim 1, wherein the bus bar is molded on the input / output circuit board. 4. The electric connection box according to claim 1, wherein a stress absorbing portion is formed on the connection terminal.