JPH10285749A - Electrical connection box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a case and a wire harness and to lower costs by a method, wherein the terminal of a relay, for board mounting, at a relay mounting part in the case is soldered directly to a conductor at a circuit on an electronic unit board inside the case. SOLUTION: An electronic unit board 7 is attached at the inside of a lower case 2, in such a way that a soldering face 7a is directed to the opening direction of the lower case 2. In addition, each relay 5 is attached to a relay- mounting part 2B in the lower case 2 in such a way that a face 5b at relay terminals 5a,... is directed to the opening direction of the lower case 2. Then, a rise terminal part 8b at a bus bar 8 is passed through, and the relay 5 is attached to a relay-mounting part 2B. In a state that the relay terminals 5a,... are passed through a bent part 8b at the bus bar 8, terminals of every electronic component 6 and the rise terminal part 8a are soldered collectively to a circuit at the soldering face 7a on the electronic unit board 7, and the relay terminals 5a,... of the relay 5 are soldered to the bent part 8b at the bus bar 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric junction box capable of greatly reducing costs.

[0002]

2. Description of the Related Art Conventionally, an electric connection box (junction block) or a relay block mounted on an automobile has been used as a means for distributing power to an automobile or connecting a branched wire harness. In addition, there is also used one in which an electronic unit (control unit) is incorporated in an electric connection box to reduce the wiring harness.

[0003] In recent years, the number of circuits to be taken in has been remarkably increased with the advancement of the functions of automobiles in recent years. In addition, it is not enough to incorporate an electronic unit into an electric junction box. It is the fact that it is installed in.

[0004]

However, mounting the cases accommodating the electronic units in various places of the automobile requires a cost, and the wiring harness connecting these electronic units becomes complicated, thus increasing the cost. Has become a factor. In addition, since the number of circuits to be taken in continues to increase, the size of the case increases and the mounting space increases.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and has been made so that an electronic unit substrate can be rationally incorporated, and the number of cases and wire harnesses can be reduced to achieve a significant cost reduction. It is intended to provide a connection box.

[0006]

According to a first aspect of the present invention, an electronic unit substrate is mounted in one of an upper case and a lower case, and the electronic unit substrate is mounted in the lower case. Attach the board mounting relay to the relay mounting part set on the outer surface of the case, and solder the terminals of this board mounting relay to the conductor connected to the circuit of the electronic unit board inside the case by soldering An electric connection box characterized by the following.

According to the first aspect, a board mounting relay (so-called miniature relay) which is originally directly mounted on the electronic unit substrate by solder is provided on a relay mounting portion on the outer surface of the case in which the electronic unit substrate is mounted. After mounting, the terminals of the relay are directly soldered to conductors connected to the circuit of the electronic unit board.

If the conductor is a bus bar insert-molded in a case to which the electronic unit substrate is attached, the terminals of the relay can be directly attached to the bus bar by soldering.

Further, the soldering surface of the electronic unit substrate and the soldering surface of the relay terminal are oriented in the opening direction of the case to which the electronic unit substrate is mounted, and the two soldering portions are substantially the same. When the height is set, the soldering of the electronic components on the electronic unit substrate and the soldering of the terminals of the relay can be performed at once.

Further, a fuse mounting portion and a connector insertion portion are set at predetermined positions on the outer surface of each of the cases, while a terminal on the upstream side of the fuse is connected to a power supply inside each of the cases. At the same time as connecting to the connected bus bar, the crimp terminal of the wire of the through circuit and the crimp terminal of the single core wire crimped to the crimp terminal of the connector insertion part are inserted and connected to the terminal on the downstream side of the fuse, respectively. The circuit involving the relay and the circuit involving the electronic unit substrate can be formed by flat bus bars.

With this configuration, since the electronic unit substrate, the relay, and the fuse can be assembled to the electric junction box, the electronic unit substrate, the relay, and the fuse do not need to be provided.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings.

As shown in FIGS. 1 and 2A, the electric connection box includes an upper case 1 and a lower case 2 in the shape of a rectangular box. Are locked by the lock portions 1a and 2a.

On the upper surface of the upper case 1, connector insertion portions 1A, 1B, 1C and a fuse attachment portion 1D are provided.
B, 1C each connector 3 of wire harness 3, ..., 3
A, 3B, and 3C are inserted, and fuses 4 (in this example, five in each of two vertical columns, a total of ten) are inserted into the fuse mounting portion 1D.

On the lower surface of the lower case 2, a connector insertion portion 2A and a relay mounting portion 2B are provided.
The connector 3D of the wire harness 3 is inserted into the connector insertion portion 2A, and the relay mounting portion 2B is
The board mounting relays 5 (four in one row in this example) are mounted. The board mounting relay 5 is
Originally, it is for directly attaching to an electronic unit substrate 7 described later by soldering.

An electronic unit substrate 7 on which a large number of electronic components 6 are arranged along a printed circuit is mounted inside the lower case 2 so that the soldering surface 7a faces the opening direction of the lower case 2. The relay mounting portion 2B of the lower case 2 is recessed so as to protect the outer peripheral surface of each relay 5, and the relay mounting portion 2B
Are connected to the relay terminals 5 in the same manner as the electronic unit substrate 7.
a,..., 5a are oriented so that the surface 5b faces the opening direction of the lower case 2.

A flat bus bar 8 is insert-molded inside the lower surface of the lower case 2. Although FIG. 2A shows the bus bar 8 as if it were a single bus bar, actually, a large number of bus bars are arranged in parallel to form a complicated circuit.

The rising terminal portion 8a of the bus bar 8
It penetrates through the electronic unit substrate 7 and projects slightly upward. Further, the relay terminals 5a of the respective relays 5 of the relay mounting portion 2B penetrate through the bent portions 8b of the bus bars 8 which extend leftward from below the electronic unit substrate 7 and are bent upward. Projecting upward. The upper surface of the bent portion 8b of the bus bar 8 is set to be substantially the same height as the soldering surface 7a of the electronic unit substrate 7.

A rising terminal portion 8c is formed at the right end of the bus bar 8, and a falling terminal portion 8d projecting into the connector insertion portion 2A is formed at the center.

The electronic unit substrate 7 is mounted on the lower case 2 to penetrate the rising terminal portion 8a of the bus bar 8, and the relay 5 is mounted on the relay mounting portion 2D, and the relay terminal 5a is mounted on the bent portion 8b of the bus bar 8. In the state of being penetrated, the terminals of the electronic components 6 and the rising terminal portions 8a are collectively soldered to the circuit on the soldering surface 7a of the electronic unit substrate 7 by the flow soldering method, and the relay terminals of the relay 5 are connected. 5a is bent portion 8 of bus bar 8
b. Note that, as shown in FIG. 2B, the electronic unit substrate 7 is provided without providing the bent portion 8b on the bus bar 8.
The printed circuit may be extended, or the conductor connected to the printed circuit may be extended, and the relay terminal 5a of the relay 5 may be soldered to these extensions 16.

On the other hand, a flat bus bar 14 is mounted on the fuse mounting portion 1D of the upper case 1, and each terminal 4a on the upstream side of the fuse 4 is connected to a rising end 14a. Referring to the circuit diagram of FIG. 3, the flat bus bar 14 is connected to an external power harness via a connector. Further, a rising terminal portion 14b is set on the flat bus bar 14, and the connector 3C can be inserted and connected by protruding from the connector insertion portion 1C. The flat bus bar 14 may be constituted by a vertical bus bar.

In the cavity into which the terminal 4b on the downstream side of the fuse mounting portion 1D is inserted, an electric wire 1 of a through circuit is provided.
The terminal 4b can be inserted and connected to the crimping terminal 11 while the crimping terminal 11 is accommodated therein.

Further, the press contact terminals 13a, 13
b, 13c are respectively connected by press contact, the press contact terminal 13a is accommodated in a cavity into which the terminal 4b on the downstream side of the fuse 4 is inserted, and the terminal 4b is inserted and connected to the terminal 13a, and the press contact terminals 13b, 13c are connected to the connector. The connector 3A is projected into the insertion portion 1A (or 1B).
(Or 3B) can be plugged in.

The falling terminal portion 14 of the flat bus bar 14
c is a rising terminal portion 8c of the insert bus bar 8.
Can be connected to each other by the relay terminal 15.

Further, the board terminals 7b, 7b rising from the electronic unit board 7 are projected to the connector insertion portion 1B of the upper case 1, for example, so that the connector 3B can be inserted and connected.

When the electric junction box is constructed as described above, the terminal 5a of the small and inexpensive board mounting relay 5 attached to the relay attaching portion 2B of the lower case 2 is connected to the insert bus bar connected to the circuit of the electronic unit substrate 7. 8 can be directly attached to the bent portion 8b by soldering, so that a large space for directly attaching the relay 5 to the electronic unit substrate 7 is not required, and the electronic unit substrate 7 can be downsized.

When the bus bar 8 is insert-molded in the lower case 2 on which the electronic unit substrate 12 is mounted, the terminal 5a of the relay 5 can be directly mounted on the insert bus bar 8 by soldering, so that a connector or the like becomes unnecessary. Further, since the soldering portions of the electronic unit substrate 7 and the terminals 5b of the relay 5 are set at substantially the same height, the soldering process of the electronic component 6 of the electronic unit substrate 7 and the terminal 5
The soldering step a can be performed collectively.

[0028]

As is clear from the above description, in the electric connection box of the present invention, the terminals of the board mounting relay of the relay mounting portion of the case are soldered to the conductors of the circuit of the electronic unit substrate in the case. In this case, a large space for directly mounting the relay on the substrate is not required, and the expensive substrate can be reduced in size, so that the cost can be reduced. Also, on the relay mounting part on the outer surface of the case,
Instead of a large and expensive ordinary relay, a small and inexpensive board mounting relay can be attached, and a case dedicated to the electronic unit substrate is not required, so that the cost can be reduced from these points.

Further, when the conductor is an insert bus bar, the terminal of the relay can be directly attached to this bus bar by soldering, so that a connector or the like is not required, and the connection portion can be reduced in size. This eliminates the need for connectors and relay terminals for relays, thereby reducing costs.

Further, when the soldering portions of the electronic unit substrate and the relay terminals are substantially flush with each other, the soldering process can be performed at a time, so that the number of assembling steps can be greatly reduced. The cost can be reduced.

Further, by assembling the electronic unit board, the relay and the fuse to the electric connection box, each case becomes unnecessary and the cost can be reduced, and the mounting space can be reduced. Since the terminals and the pressure contact terminals can be used rationally, the wire harness can be reduced and the cost can be reduced.

[Brief description of the drawings]

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

FIG. 2A is a side cross-sectional view of an electric junction box, and FIG. 2B is a side cross-sectional view of a main part of a modification of the electric junction box.

FIG. 3 is a circuit diagram of an electric junction box.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper case 2 Lower case 2B Relay attachment part 4 Fuse 5 Board mounting relay 5a Terminal 7 Electronic unit board 8 Insert bus bar

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yuichi Ito 1-7-10 Kikuzumi, Minami-ku, Nagoya City, Aichi Prefecture Inside Harness Research Institute, Inc. (72) Inventor Yoshitaka Sumita 1 Kikuzumi, Minami-ku, Nagoya City, Aichi Prefecture No.7-10, Harness Research Institute, Inc.

Claims (4)

[Claims] An electronic unit board is mounted inside one of an upper case and a lower case, and a board mounting relay is mounted on a relay mounting portion set on an outer surface of the case to which the electronic unit board is mounted.
An electric connection box wherein terminals of the board mounting relay are connected by soldering to a conductor connected to a circuit of the electronic unit board inside the case. 2. The electric connection box according to claim 1, wherein the conductor is a bus bar insert-molded in a case to which the electronic unit substrate is attached. 3. A soldering surface of the electronic unit substrate and a soldering surface of the relay terminal are oriented in an opening direction of a case to which the electronic unit substrate is mounted, and both soldering portions are set at substantially the same height. The electric junction box according to claim 1. 4. A fuse mounting portion and a connector insertion portion are set at predetermined positions on the outer surface of each case,
Inside each of the above cases, the upstream terminal of the fuse is connected to a bus bar connected to a power supply, and the downstream terminal of the fuse is connected to a crimp terminal of an electric wire of a through circuit and a press contact terminal of a connector insertion portion. The electric connection box according to any one of claims 1 to 3, wherein each of the press-connecting single-core wire press-connecting terminals is inserted and connected, and a circuit entangled with the relay and a circuit entangled with the electronic unit board are formed by a flat bus bar. .