JPH10322854A - Electric junction box incorporating electronic circuit unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make an electronic circuit unit to be easily and stably incorporated in the upper case of an electric junction box. SOLUTION: Supporting ribs 17 which supports both side sections of a printed circuit board 13 from the lower surface side and retaining ribs 19 which retain both side sections of the board 15 from the upper surface side are formed in the upper case 1 of an electrical junction box. The supporting ribs 17 are formed in parallel with the surface of the board 13 and the retaining ribs 19 are formed perpendicularly to the surface of the board 13. In addition, mold extracting holes 21 are formed through the roof plate section 1a of the upper case 1 at the positions corresponding to the ribs 17. An electronic circuit unit 11 is held in the upper case 1 by putting the board 13 between the ribs 17 and 19 so that the retaining ribs 19 may press the board 13 against the supporting ribs 17.

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 with a built-in electronic circuit unit in which an electronic circuit unit is incorporated in an electric junction box used for connecting wiring in a vehicle.

[0002]

2. Description of the Related Art When an electronic circuit unit having electronic components mounted on a printed circuit board is incorporated in a case of an electric connection box, conventionally, a projection is formed on a lower case or an insulating plate, and an electronic circuit is formed on the projection. Place the unit or
In general, a component for supporting the electronic circuit unit is assembled to the lower case, and the component is used to support the electronic circuit unit.

[0003]

However, in the above-mentioned structure, the layout area of the bus bar is reduced by the projection formed on the lower case or the insulating plate, and the layout of the bus bar avoiding the projection is required. Design becomes difficult. In some cases, the size of the case must be increased. On the other hand, in the above structure, not only the number of parts increases, but also the number of assembling steps increases,
It is expensive and costly to manufacture parts.

[0004] In addition, Japanese Utility Model Laid-Open No. 2-91412 proposes that the electronic circuit unit is housed in a protective cover. It has been difficult to balance the stability of the electronic circuit unit afterwards (integration with the protective cover).

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide an electronic circuit unit with an upper case (including a protective cover) without restricting the layout of conductors such as bus bars and without increasing the number of parts. Another object of the present invention is to provide an electric junction box with a built-in electronic circuit unit which can be easily and stably incorporated.

[0006]

According to the present invention, there is provided an electronic apparatus including an upper case and a lower case, in which a conductor forming a connection circuit and an electronic circuit unit having electronic components mounted on a printed circuit board are incorporated. In the electric connection box with built-in electronic circuit unit, inside the upper case, support ribs for supporting both sides of the printed circuit board of the electronic circuit unit from the lower side, and both sides of the printed circuit board from the upper side. A holding rib for holding the electronic circuit unit is formed, the printed circuit board of the electronic circuit unit is inserted between the supporting rib and the holding rib, and the printed circuit board is pressed against the supporting rib with the holding rib. It is characterized by being held in a case.

[0007] In this case, since the electronic circuit unit can be incorporated in the upper case, the layout of the conductors in the lower case is not restricted and the number of components does not increase. In addition, the electronic circuit unit can be easily incorporated into the upper case by inserting both sides of the printed circuit board between the support rib and the holding rib, and after assembly, the printed circuit board is pressed against the supporting rib by the holding rib. Therefore, the stability of the electronic circuit unit is also good.

Further, the present invention is also directed to a die, wherein the holding rib is formed inside the supporting rib so as not to overlap with the supporting rib in the vertical direction, and the top plate of the upper case is provided with a mold at a position corresponding to above the supporting rib. It is preferable to adopt a configuration in which a hole is formed. This facilitates the manufacture of the upper case.

Further, according to the present invention, an opening for incorporating an electronic circuit unit is formed in a part of the peripheral wall of the upper case, and the upper case and the lower case are connected to a part of the peripheral wall of the lower case. It is preferable that a closing plate for closing the opening is formed. With this configuration, the opening provided in the upper case for assembling the electronic circuit unit is closed by the connection between the upper case and the lower case, so that the protection of the electronic circuit unit is further ensured.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings. [Embodiment 1] FIGS. 1 to 4 show an embodiment of the present invention. In the figure, 1 is an upper case, 3 is a lower case, 5 is a bus bar alternately laminated with an insulating plate 7 in the lower case 3, and these constitute an electric connection box 9.

An electronic circuit unit 11 is incorporated in the upper case 1. The electronic circuit unit 11 is obtained by mounting an electronic component 15 on a printed circuit board 13. In order to incorporate the electronic circuit unit 11 in the upper case 1, the printed circuit board 1 is provided in the upper case 1.
A support rib 17 for supporting both side portions of the printed circuit board 3 from the lower surface side and a holding rib 19 for pressing both side portions of the printed circuit board 13 from the upper surface side are formed.

The support rib 17 is formed in the same direction as the plate surface of the printed circuit board 13, and the holding rib 19 is formed perpendicular to the plate surface of the printed circuit board 13. A die hole 21 is formed in the top plate 1 a of the upper case 1 at a position corresponding to a position above the support rib 17. The holding rib 19 is formed on the edge of the hole 21 so as not to overlap the supporting rib 17 in the vertical direction. With such a structure, the upper case 1 having the support ribs 17 and the holding ribs 19 can be easily manufactured by a single molding. The support rib 17 is not limited to a flat plate, and may have an upwardly projecting ridge at its tip. The holding ribs 19 may not be perpendicular to the surface of the printed circuit board, but may be slightly inclined or curved, for example, to have a spring property.

When the upper case 1 has the above-described structure, both sides of the printed circuit board 13 are supported by the support ribs 1.
The electronic circuit unit 11 can be easily incorporated into the upper case 1 by inserting the electronic circuit unit 11 between the holding rib 7 and the holding rib 19. Further, the printed circuit board 13 is supported by the support ribs 1.
When the printed circuit board 13 is inserted between the holding rib 7 and the holding rib 19, the printed circuit board 13 is pressed against the supporting rib 17 by the holding rib 19, so that the electronic circuit unit 11 is held in a stable state.

Further, after the electronic circuit unit 11 is assembled in the upper case 1, in order to more reliably prevent the printed circuit board 13 from moving in the insertion direction, a slit 23 is formed in the front end of the support rib 17 so as to be elastic. A tongue piece 25 is formed, and a locking claw 27 is formed at the tip of the elastic tongue piece 25. The locking claw 27 is mounted on the printed circuit board 1.
When 3 is inserted to the point where it can no longer be inserted,
The elastic tongue 25 resiliently engages the front end of the printed circuit board 13 to prevent the printed circuit board 13 from moving in the insertion direction.

Further, in order to enable the electronic circuit unit 11 to be incorporated into the upper case 1, the upper case 1
An opening 29 is formed in a part of the peripheral wall of FIG.
(See FIG. 4). The opening 29 is large enough to allow the printed circuit board 13 and the electronic components 15 mounted thereon to pass therethrough. If the opening 29 is left open, the protection of the electronic circuit unit 11 is not sufficient, so that a part of the peripheral wall of the lower case 3 is integrally formed with a closing plate 31 for closing the opening 29. (See FIG. 4). When the upper case 1 and the lower case 3 are connected to each other, the closing plate 31 covers the opening 29 from the inside as shown in FIG.

The printed circuit board 13 has a connector 3
The bus bar 5 is formed with a tab 5a that is inserted into and connected to the connector 33.
The connector 33 and the tab 5a are inserted and connected to each other when connecting the upper case 1 and the lower case 3, so that the electronic circuit unit 11 and the bus bar 5 are electrically connected.

[Embodiment 2] FIGS. 5 and 6 show another embodiment of the present invention. 5 and 6 are views corresponding to FIGS. 2 and 4 of the first embodiment, respectively. This embodiment differs from the first embodiment in that a connector 35 is mounted on the printed circuit board 13 and a notch 37 is formed in the closing plate 31 so that an external connector can be connected to the connector 35. The other parts are the same as in the first embodiment, and the same parts are denoted by the same reference numerals and description thereof will be omitted.

[0018]

As described above, according to the present invention, since the electronic circuit unit is incorporated in the upper case, the layout of the conductors in the lower case is not restricted and the number of parts increases. Nor. In addition, the electronic circuit unit can be easily incorporated into the upper case by inserting the printed circuit board between the support rib and the holding rib, and after the printed circuit board is pressed against the supporting rib by the holding rib, The electronic circuit unit can be stably held.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of an electric connection box with a built-in electronic circuit unit according to the present invention.

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

FIG. 3 is a plan view of the upper case in the electric junction box of FIG. 1 in a state where the electronic circuit unit is not incorporated.

FIG. 4 is a front view of an upper case and a lower case in the electric junction box of FIG. 1;

FIG. 5 is a sectional view showing another embodiment of the present invention.

FIG. 6 is a front view of an upper case and a lower case in the electric connection box of FIG. 5;

[Explanation of symbols]

 1: Upper case 3: Lower case 5: Bus bar 7: Insulating plate 9: Electric connection box 11: Electronic circuit unit 13: Printed circuit board 15: Electronic component 17: Supporting rib 19: Holding rib 21: Die hole 29: Opening Part 31: closure plate

Claims (3)

[Claims] 1. An upper case (1) and a lower case (3).
In the electric connection box with a built-in electronic circuit unit, a conductor (5) constituting a connection circuit and an electronic circuit unit (11) having an electronic component (15) mounted on a printed circuit board (13) are incorporated therein. The upper case (11)
Inside the support ribs (1) for supporting both sides of the printed circuit board (13) of the electronic circuit unit from below.
7) and pressing ribs (19) for pressing both sides of the printed circuit board (13) from the upper surface side, and the printed circuit board (13) of the electronic circuit unit is connected to the supporting rib (17) and the pressing rib. (19), the printed circuit board (13) is pressed against the support rib (19) by the holding rib (19), and the electronic circuit unit (11) is held by the upper case (1). An electric connection box with a built-in electronic circuit unit. The holding rib (19) is formed inside the supporting rib (17) so as not to overlap with the supporting rib (17) in the vertical direction, and the top plate (1) of the upper case (1).
2. The electric connection box with built-in electronic circuit unit according to claim 1, wherein a die hole (21) is formed in a) at a position corresponding to a position above the support rib (17). 3. A part of the peripheral wall of the upper case (1) includes:
An opening (29) for assembling the electronic circuit unit (11) is formed, and a part of the peripheral wall of the lower case (3) is connected to the upper case (1) and the lower case (3). A closing plate (3) for closing the opening (29)
3. The electric connection box with a built-in electronic circuit unit according to claim 1, wherein 1) is formed.