JP2000115958A - Connection structure for junction box body and electronic printed circuit board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connection structure for a junction box body and an electronic circuit board, which is capable of downsizing the electronic circuit board disposed with relays. SOLUTION: This is a connecting structure connecting a junction box body 2 formed by arranging a high current circuit 12 on its middle bottom 11 disposed inside it, and an electronic printed circuit board 3 formed by disposing a signal current circuit 31 on an insulating substrate 30. With relays 4 controlling high current which flows through the high current circuit, disposed between the middle bottom and the electronic printed circuit board, one end of the relay is electrically connected with the high current circuit and the other end thereof is electrically connected with the signal current circuit respectively. The relay involves a connecting terminal at one end of the body of the relay, which is electrically connected with the high current circuit, and a connecting pin at the other end thereof, which is soldered to the signal current circuit, and the other end of the relay is mechanically connected with the electronic printed circuit board. A relay mounting part 13 is partitioned on the high current circuit side of the middle bottom to insert one end part of the relay, and the one end of the relay is mechanically connected with the body of the junction box.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection structure between a connection box main body and an electronic circuit board.

[0002]

2. Description of the Related Art Conventionally, a connection structure for an electric connection box 80 as shown in FIG. 6 has been proposed. In this connection structure, a tab terminal 85 is started up from a bus bar circuit 84 arranged on a middle bottom 83 of a connection box main body 81, and the tab terminal 85 is inserted into a terminal hole (not shown) of the electronic circuit board 82 to connect. By attaching the member 86 to the tab terminal 85, the connection box main body 81 and the electronic circuit board 82
Is a structure that connects

However, when the relay 87 is provided on the insulating substrate 88 of the electronic circuit board 82 to control the bus bar circuit 84, a thick current (large current) from the bus bar circuit 84 is supplied to the relay 87 (see FIG. 1). Large) connection circuit 8
Nine needed to be routed. Thereby, the electronic circuit board 8
There was a problem that the size of No. 2 was increased.

[0004]

SUMMARY OF THE INVENTION In view of the above, the present invention provides a connection structure between a connection box main body and an electronic circuit board, which reduces the size of an electronic circuit board on which a relay is provided. The purpose is to do.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a connection box body in which a strong current circuit is routed on a midsole disposed therein, and a signal current circuit on an insulating substrate. A structure for connecting an electronic circuit board provided, wherein a relay for controlling a strong current flowing in the strong current circuit is disposed between the midsole and the electronic circuit board, and one end of the relay is connected to the electronic circuit board. A connection structure of an electronic circuit board and a connection box main body electrically connected to the strong current circuit and the other end to the signal current circuit, respectively (claim 1). The relay has a connection terminal electrically connected to the strong current circuit at one end of the relay main body, and a connection pin soldered to the signal current circuit at the other end of the relay main body; The connection structure of the connection box body and the electronic circuit board, the other end of which is mechanically connected to the electronic circuit board. A junction box body and an electronic circuit board, in which a relay mounting portion is sectioned on the side of the strong current circuit at the middle bottom to insert one end of the relay, and one end of the relay is mechanically connected to the junction box body. (Claim 3).

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 to 5 show an embodiment of a connection structure between a connection box body and an electronic circuit board according to the present invention. In FIG. 1, this connection structure is a structure in which a connection box main body 2 in an electric connection box 1 and an electronic circuit board 3 are electrically and mechanically connected via a relay 4.

The electric junction box 1 is assembled to the junction box main body 2, the electronic circuit board 3 and the wiring circuit board 5 arranged in the junction box main body 2, and the upper and lower parts of the junction box main body 2, respectively. It comprises an upper cover 6 and a lower cover 7. The connection box body 2 includes a square-shaped peripheral wall 10 and an inner peripheral surface 10 of the peripheral wall 10.
a, and an upper surface 1 of the midsole 11
It comprises a busbar circuit 12 (corresponding to a strong current circuit in the claims) provided in 1a, and a relay mounting portion 13 defined on the upper surface 11a of the midsole 11.

As shown in FIGS. 1 and 2, an upper step 14 for arranging the upper cover 6 is formed on the upper edge of the peripheral wall 10, and a lower step 15 for the lower cover 7 is provided on the lower edge. ing. The peripheral wall 10 has a first notch 16 and a second notch 1
7 are formed. A first connector 18 electrically connected to the bus bar circuit 12 is provided in the first notch 16. An upper holding wall 19 for holding the electronic circuit board 3 is provided on the upper side of the inner peripheral surface 10a of the peripheral wall 10, and a lower side of the inner peripheral surface 10a for the electric wiring circuit board 5 is provided. A lower holding wall 20 is provided.

As shown in FIG. 2, the bus bar circuit 12 is formed by pressing a conductive metal plate (not shown) into a desired pattern shape. Usually, the bus bar circuit 12
Is supplied with a strong current (large current), and the tab terminal 21 is raised (raised) at a required location. By arranging the bus bar circuit 12 on the midsole 11, it is possible to perform substantially the same operation as a bus bar circuit board (not shown). In addition, a bus bar circuit 12 is provided on an insulating substrate (not shown) to provide a bus bar circuit board.
It is also possible to put on.

As shown in FIG. 1 and FIG.
Is composed of a block main body 22, a relay accommodating chamber 23 penetrating the block main body 22 in the vertical direction, and a tab terminal 21 raised from the bus bar circuit 12 in the relay accommodating chamber 23. In this embodiment, four relay accommodating chambers 23 are formed. The tab terminal 21 has a substantially U-shaped slit 24 at the tip. The relay accommodating chamber 23 is formed in a size (size) such that the one end 4a (see FIG. 3) of the relay 4 can be fitted therein.

As shown in FIGS. 1 and 2, the electronic circuit board 3
Is composed of an insulating substrate 30, a signal current circuit 31 arranged on the upper surface 30a of the insulating substrate 30, and a relay 4 connected to the signal current circuit 31. The current flowing through the signal current circuit 31 is much weaker (smaller) than the strong current flowing through the bus bar circuit 12. Then, the relay 4 controls (switches) the current flowing through the bus bar circuit 12 according to the control command from the signal current circuit 31. Note that the signal current circuit 31 can be routed on the lower surface 30b of the insulating substrate 30.

As shown in FIGS. 2 and 3, the relay 4 comprises a block-shaped relay body 35 and one end 35 of the relay body 35.
a, and a pair of connection pins 37, 3 arranged on the other end 35b of the relay body 35.
7 The relay 4 is disposed between the bus bar circuit 12 of the connection box main body 2 and the lower surface 30b of the insulating substrate 30, one end 4a of the relay main body 35 is fitted into the relay accommodating chamber 23, and the connection terminal 36 is connected to the tab terminal. 21 is inserted and locked in the slit 24. The connection pins 37 are soldered to the signal current circuit 31. In this case, the insulating substrate 30
Then, the connection pin 37 is inserted into the pin hole 38 and soldered to the signal current circuit 31.

As shown in FIG. 2 and FIG.
Other electronic components 39 and a second connector 40 for connecting an external connector (not shown) are provided on the lower surface 30b of the “0”. A circuit 42 arranged on the lower surface 30b of the insulating substrate 30 is electrically connected to a terminal 41 in the second connector 40, and an electronic component 39 is also electrically connected to the circuit 42. The second connector 40 is inserted into the second notch 17 of the connection box body 2. The circuit 42 and the signal current circuit 31 can be arranged on the same surface of the insulating substrate 30, or the signal current circuit 31 can be provided on the lower surface 30b and the circuit 42 can be provided on the upper surface 30a. Is also possible.

As shown in FIG. 1, the electric wiring circuit board 5 comprises:
It comprises an insulating substrate 45, a number of bosses 46 disposed on the upper surface 45a of the insulating substrate 45, and electric wires 47 sandwiched by the bosses 46 and arranged in a desired shape. Some of the terminals (not shown) in the first connector 18 are pressed against the electric wire 47.

Next, a process (method) for manufacturing (forming) the electric junction box 1 will be described. As shown in FIG. 1, a busbar circuit 12 is routed on the middle bottom 11 of the connection box main body 2, and a relay mounting portion 13 is defined. The first connector 18 is disposed in the first notch 16, and some of the terminals in the first connector 18 are electrically connected to the bus bar circuit 12.
A terminal hole (not shown) formed in the midsole 11 with the remaining terminals
Insert The busbar circuit 12 is routed to the midsole 11 by forming a routing groove (not shown) for the busbar circuit 12 in the midsole 11 and press-fitting the busbar circuit 12 into the routing groove. .

As shown in FIGS. 1 and 2, a signal current circuit 31 is arranged on the upper surface 30a of the insulating substrate 30, a connection pin 37 of the relay 4 is inserted into a pin hole 38, and soldered to the signal current circuit 31. I do. As shown in FIG. 4, a circuit 42 is provided on the lower surface 30b of the insulating substrate 30, and the second connector 40 is connected to the lower surface 3b.
0b and the terminal 41 in the second connector 40.
Is electrically connected to the circuit 42. Then, a large number of electronic components 39 (for example, transistors) are soldered to the circuit 42. Thus, the electronic circuit board 3 is formed.

Then, as shown in FIG.
Are arranged on the upper holding wall 19 of the connection box body 1, and one end 4 a of the relay 4 is pushed into the relay accommodating chamber 23 of the relay mounting part 13 to be fitted therein, and the tab terminal raised from the bus bar circuit 12 is inserted. In 21 slits 24,
The connection terminal 36 of the relay 4 is inserted and locked (press-fit). At the same time, the second connector 40 is inserted into the second notch 17.
As shown in FIG. 1, an electric wire 47 having a desired shape is clamped and fixed by a boss 46 arranged on an upper surface 45a of an insulating substrate 45. Thus, the wiring circuit board 5 is formed.

As shown in FIG. 2, the upper cover 6 is pushed into the upper portion of the junction box body 2 until it hits the upper step 14, and the inner peripheral surface 10a of the peripheral wall 10 and the outer peripheral surface 6a of the upper cover 6 are brought into close contact with each other. Let it. The wiring circuit board 5 is accommodated from the lower part of the connection box main body 2, and the upper surface 45 a of the insulating substrate 45 constituting the wiring circuit board 5 is abutted against the lower holding wall 20. At this time, the terminal protruding from the terminal hole of the midsole 11 is formed with a slit (not shown) at the tip, so that the terminal is pressed against the electric wire 47 of the wiring circuit board 5. While the electric wiring circuit board 5 is in contact with the lower holding wall 20, the lower step 1
The lower cover 7 is pushed into the lower portion of the connection box main body 2 until it comes into contact with the inner wall 5, and the inner peripheral surface 10 a of the peripheral wall 10 and the outer peripheral surface 7 a of the lower cover 7 are similarly brought into close contact with each other. Thus, the electric connection box 1 of FIG. 5 is formed.

In the manufactured (formed) electric junction box 1,
Since the bus bar circuit 12 through which a strong current flows is arranged only in the connection box main body 2, it is not necessary to provide a new circuit for flowing a strong current through the electronic circuit board 3. Therefore, the size of the insulating substrate 30 constituting the electronic circuit board 3 can be reduced (downsized), and the electronic circuit board 3 itself can be reduced in size. Accordingly, the size of the electric connection box 1 itself can be reduced, so that the manufacturing cost of the electric connection box 1 can be reduced (reduced).

Further, since the junction box main body 2 and the electronic circuit board 3 are connected not only electrically but also mechanically by the relay 4, the assembling work of the electric junction box 1 is facilitated. Therefore, the assembling work can be performed quickly.

In this embodiment, the electronic circuit board 3 and the connection box main body 2 are connected by the relay 4, but they can be connected by another auxiliary device (for example, a connector or a fuse). Therefore, the present invention is not limited to this embodiment.

[0022]

As described above, according to the first aspect, the strong current circuit is routed on the middle bottom of the junction box body, and the signal current circuit is routed on the insulating substrate of the electronic circuit board. The relay is disposed between the midsole and the electronic circuit board, and one end of the relay is electrically connected to the strong current circuit, and the other end of the relay is electrically connected to the signal current circuit. Thus, a signal current circuit for giving a control command to the relay and a strong current circuit controlled by the relay can be separately arranged. Therefore, it is not necessary to arrange a circuit for flowing a strong current from the strong current circuit on the insulating substrate of the electronic circuit board, as compared with the related art, and accordingly, the circuit is electrically connected to the strong current circuit. A connecting member is not required. Accordingly, the size (size) of the insulating substrate can be reduced (smaller), and the manufacturing cost of the electronic circuit board can be reduced. And the whole size can also be reduced.

According to the second aspect of the present invention, the relay body has a connection terminal at one end and a connection pin at the other end, the connection terminal is electrically connected to the high current circuit pattern, and the connection pin is weakly connected. Soldered to the diverted circuit pattern.
This allows the other end of the relay to be mechanically connected to the electronic circuit board.

According to the third aspect of the present invention, the relay mounting portion is formed on the middle bottom of the strong current circuit, and one end of the relay is inserted into the relay mounting portion. Therefore, one end of the relay can be mechanically connected to the connection box body. According to the second and third aspects of the present invention, one end of the relay can be mechanically connected to the connection box main body, and the other end of the relay can be mechanically connected to the electronic circuit board. It can be mechanically connected to a circuit board. According to the first to third aspects of the present invention, the connection box body and the electronic circuit board can be electrically and mechanically connected by using the relay. for that reason,
The reliability of the connection can be improved.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an embodiment of a connection structure between a connection box body and an electronic circuit board according to the present invention.

FIG. 2 is a sectional view taken along line XX in FIG.

FIG. 3 is a perspective view of the relay in FIG.

FIG. 4 is a diagram viewed from an arrow Y in FIG. 1;

FIG. 5 is an overall perspective view of the electric connection box in FIG. 1;

FIG. 6 is a perspective view showing a conventional example.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 electrical junction box 2 junction box body 3 electronic circuit board 4 relay 11 midsole 12 busbar circuit (strong current circuit) 13 relay mounting part 30 insulating board 31 signal current circuit 35 relay body 35 a one end 35 b other end 36 connection terminal 37 connection pin

Claims (3)

[Claims] 1. A structure for connecting a connection box main body having a strong current circuit arranged on an inner bottom disposed therein and an electronic circuit board having a signal current circuit arranged on an insulating substrate. A relay for controlling a strong current flowing through the strong current circuit is disposed between the midsole and the electronic circuit board, and one end of the relay is connected to the strong current circuit, and the other end is connected to the signal current circuit. A connection structure between a connection box body and an electronic circuit board, which is electrically connected. 2. The relay has a connection terminal electrically connected to the strong current circuit at one end of the relay body and a connection pin soldered to the signal current circuit at the other end of the relay body. The connection structure according to claim 1, wherein the other end of the relay is mechanically connected to the electronic circuit board. 3. A relay mounting portion is formed on the side of the strong current circuit at the middle bottom for inserting one end of the relay, and one end of the relay is mechanically connected to the connection box main body. 3. A connection structure between a connection box body and an electronic circuit board according to claim 1.