JPH09182249A - Bus-bar fixing structure in electric connection box with electronic circuit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To arrange a connector getting-in part in a lower case under bus-bars by fixing the bus-bars being under an electronic circuit board. SOLUTION: Along with getting in an electronic circuit board 14 above parts of an insulating board to be laminated and arranged on a lower case 11 and bus-bars 13, a connector getting-in part 20 is provided in the lower case 11 at its corresponding position to the installed position of the electronic circuit board 14. A bus-bar pressing cover 18 is put under the elctronic circuit board 14, and on the top-surface of the top-position bus-bar 13a laminated.

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 with an electronic circuit for connecting to a wire harness for an automobile, and more specifically, to a connector housing portion in a lower case at a position facing an electronic circuit board housed in the electric connection box. It can be provided.

[0002]

2. Description of the Related Art Conventionally, as an electric connection box with an electronic circuit of this kind, as shown in FIGS. 8A, 8B and 8C, an electronic circuit board 3 is provided in a case 2 different from the electric connection box 1. On the other hand, the bus bar side electrical connection portion of the connection terminal 5 accommodated in the housing portion 1a formed on the outer surface of the electrical connection box 1 is provided on the tab 4a protruding upward from the bus bar 4 accommodated in the electrical connection box 1. 5a is fitted from above, and the rail portion 2 of the case 2 is fitted into the rail groove portions 1b, 1b on the outer surface of the electric junction box 1.
The circuit part 3a of the electronic circuit board 3 while fitting the b and 2b
From the side to the electronic circuit side electric connection portion 5b of the connection terminal 5, and the bus bar 4 and the electronic circuit board 3 of the electric connection box 1 are connected.
There is one that electrically connects the circuit part 3a of FIG. (See JP-A-58-182414)

[0003]

However, the above-mentioned conventional electric junction box with an electronic circuit 1 requires the case 2 for accommodating the electronic circuit board 3 in addition to the electric junction box 1, resulting in an increase in cost. Therefore, it is conceivable to arrange the electronic circuit board above the bus bar without a case and store it inside the electrical junction box. In that case, however, there is no means for fixing the bus bar, so the position facing the electronic circuit board No connector housing can be provided in the lower case.

That is, when a connector accommodating portion is provided at a position facing the electronic circuit board and a mating connector is inserted, there is a problem that a bus bar provided with a tab to be fitted with a terminal of the connector is lifted by the insertion pressure. In particular, when the bus bars are stacked and set, when the tab for connecting the connector is projected from the bus bar located at the uppermost position, the bus bar at the uppermost position is likely to be lifted. As described above, since the connector accommodating portion cannot be arranged directly below the electronic circuit board, space is wasted, constraints are increased when designing the bus bar, and there is a problem that effective wiring cannot be performed.

The present invention has been made in view of the above problems, and an object of the present invention is to fix a bus bar located below an electronic circuit board so that a connector housing can be provided in a lower case below the bus bar. I am trying.

[0006]

In order to achieve the above object, according to claim 1 of the present invention, an electronic circuit board is housed above a part of an insulating plate and a bus bar which are laminated on a lower case, and the electronic circuit is provided. An electronic circuit characterized in that a connector accommodating portion is provided in a lower case portion below the board, and a bus bar retainer cover is installed on an upper surface of the uppermost bus bar laminated below the electronic circuit board. Provided is a busbar fixing structure in an electric junction box with a switch.

Specifically, a locking claw is provided on the peripheral edge of the bus bar pressing cover so as to be locked with a locked claw provided on a standing wall protruding from the lower case to fix the bus bar pressing cover to the upper surface of the bus bar. doing. (Claim 2)

Alternatively, while a projection is provided on the peripheral edge of the bus bar pressing cover, a notch for fitting the projection is provided in a housing for accommodating a connection terminal attached to the electronic circuit board, and the electronic circuit board is projected from the lower case. The busbar pressing cover is mounted and fixed on a pedestal, and the projection of the busbar pressing cover is fitted in the notch of the housing attached to the electronic circuit to fix the busbar pressing cover on the upper surface of the busbar. (Claim 3)

As described above, in the electric junction box of the present invention,
In the installation position of the electronic circuit board provided inside the case consisting of the lower case and the upper case, the electronic circuit board is not accommodated in the case accommodated in another case, and the electronic circuit board is accommodated without the case. Since the upper surface of the bus bar above which the electronic circuit board is located is pressed by the bus bar pressing cover, the bus bar can be fixed so as not to rise. Therefore, the connector housing can be provided in the lower case located directly below the electronic circuit board, and the space can be effectively used.

The connection terminal accommodated in the housing is
An electrical connection portion is provided for connecting a circuit portion of the electronic circuit board and a tab provided on the bus bar, and a housing accommodating the connection terminal is laterally fitted to the peripheral edge of the electronic circuit board to form the connection terminal and the circuit. The connecting terminals housed in the housing attached to the electronic circuit board are fitted to the tabs of the bus bar from above, and the pedestal protruding from the lower case and the pressing shoulder provided on the upper case The electronic circuit board is clamped and fixed. (Claim 4)

As described above, when the electronic circuit board is clamped and fixed by the pedestal and the pressing shoulder portion, the vertical direction can be positioned. Therefore, the electronic circuit board and the housing are positioned and held at predetermined positions, and the connection in the housing is made. The terminals can be reliably connected to the circuit section and the bus bar.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. As shown in FIGS. 1 to 6, the electrical junction box 10 includes a rectangular box-shaped lower case 11 and an upper case 12 made of synthetic resin.
When the upper case 12 is put on the upper case 12, the lock claws 11b on the outer surface 11a of the lower case 11 are engaged with the lock claws 12b on the outer surface 12a of the upper case 12, respectively, so that the upper case 12 is locked and fixed to the lower case 11. I have to.

A bus bar 13 is set and positioned on the upper surface of the lower case 11 from above. Specifically, in the lower case 11, a plurality of bus bars 13A, 13B, 13C, 13D are stacked and set on top of a plurality of holding walls 11i protruding from the bottom surface with an insulating plate 19 interposed therebetween. There is. The bus bar 13 is provided with a tab 13a protruding upward and a tab 13b protruding downward.

A busbar pressing cover 18 is provided on a part of the upper surface of the uppermost busbar 13A to prevent the busbar 13 from rising. The bus bar pressing cover 18 is installed below the electronic circuit board 14, which will be described later. The uppermost bus bar is positioned and held by the upper case 12 except for the installation position of the electronic circuit board 14 to prevent the bus bar 13 from rising.

As shown in FIG. 4, the bus bar retainer cover 18 is provided with a rectangular retainer plate portion 18a, and an outer wall portion 18b protruding upward is provided on the outer peripheral edge of the retainer plate portion 18a. Reinforcing ribs 1 inside the outer wall portion 18b
8c is provided. Further, a locking claw 18d is provided so as to project downward on the peripheral edge on the short side, and a projection 18e is provided laterally on the peripheral edge on the long side. In addition, at the four corners of the busbar pressing cover 18, guide portions 18h protruding in an L shape are formed.
Is protruding. The busbar pressing cover 18 is set to be smaller than a space of a housing 16 for accommodating connection terminals, which will be described later, which is attached to both left and right sides of the electronic circuit board 14, and the busbar 1 fitted with the connection terminals 17 accommodated in the housing 16 is fitted.
The dimensions are set so as not to interfere with the tabs 13a protruding from 3.

As shown in FIGS. 5 (A) and 5 (B), the locking claw 18d has a lower claw 18f at the lower end thereof.
The engaged claws 11h provided on the opposed standing walls 11g of the bus bar pressing cover 18 and the uppermost bus bar 13.
The upper surface of A is fixed while being pressed.

As shown in FIG. 6, the protrusion 18e fits into a notch 16b provided at the lower end of the housing 16 when the housing 16 to be described later attached to the electronic circuit board 14 is installed on the upper surface of the bus bar 13. Then, the bus bar pressing cover 18 is positioned and fixed.

In the present embodiment, the locking claw 18d and the projection 18 serve as fixing means for the bus bar pressing cover 18.
e is provided, but the locking claw 18d or the protrusion 18e
Alternatively, only one of the above may be provided.

The lower case 11 includes an electronic circuit board 14
At the position directly below the installation position of the connector housing portion 20
Are integrally molded. A plurality of tab insertion holes 11j are provided on the bottom surface of the lower case 11 located inside the connector accommodating portion 20.
And a plurality of tabs 13b including a tab 13b projecting downward from the uppermost bus bar 13A are projected into the connector accommodating portion 20.

The bus bar 1 is provided at two corners on the right side in the lengthwise direction of the upper surface of the lower case 11 and substantially in the middle in the lengthwise direction.
A total of four pedestals 11c, ..., 11c for placing electronic circuit boards, which project to a position higher than 3, are erected. Each pedestal 1
The outer surface of 1c is formed so as to be flush with the outer surface 11a of the lower case 11. An electronic circuit housing is provided above the pedestal 11c, and the electronic circuit board 1 is housed in the electronic circuit housing.
4 has a rectangular shape so that the four corners are exactly set on the upper surface of each pedestal 11c of the lower case 11.

Various electronic components 15, ..., 15 are attached to the upper surface of the electronic circuit board 14, and a printed circuit portion for electrically connecting the electronic components 15 is attached to the lower surface of the electronic circuit board 14. (Not specifically shown) is formed.
A circuit portion 14a continuous with the printed circuit portion is formed on the outer periphery of both sides of the upper surface of the electronic circuit board 14.

The housings 16, 16 which are detachably attached to the electronic circuit board 14 are made of synthetic resin in a substantially harmonica shape, and the connection terminals 17 are accommodated in a large number of terminal accommodating chambers 16 a arranged in parallel in each housing 16. ing. In addition, a notch 16 into which the protrusion 18e is fitted is provided at the lower end portion of the bus bar pressing cover 18 at a position facing the protrusion 18e.
b is provided.

Each of the connecting terminals 17 protrudes upward from the electric connecting portion 17a, which is fitted to the circuit portion 14a of the electronic circuit board 14 from the side and electrically connected, and the bus bar 13 of the lower case 11. The electrical connection portion 17b fitted from above into the tab 13a is provided in a direction orthogonal to the electrical connection portion 17b. Each housing 16 is set in advance in the electronic circuit board 14 by fitting the electric connection portion 17a on the electronic circuit side of each of the accommodated connection terminals 17 into the circuit portion 14a of the electronic circuit board 14 from the side.

In the electric junction box 10, when the electronic circuit board 14 is set on the upper surface of the pedestal 11c from above, the housing 1 attached to the outer periphery of the electronic circuit board 14 on both sides.
Guide ribs 11f for positioning 6 and 16 are provided so as to project from the lower case 11, and guide ribs 19 are provided.
a is projected from an insulating plate 19 which is laminated with the bus bar 13. Further, as shown in FIG. 1 to FIG. 3, a pressing shoulder portion 12c that abuts on the upper surface of each housing 16 when the upper case 12 is locked by covering the lower case 11 on the upper portion of the inner surface of the upper case 12, 12c are formed, and the four corners of the electronic circuit board 14 are pressed against the upper surface of each pedestal 11c of the lower case 11 via each housing 16 by each pressing shoulder 12c.

Next, a process of assembling the electric junction box 10 will be described. First, a plurality of bus bars 13A, 13B, ... Are stacked and installed on the upper wall 11g of the lower case 11 with the insulating plate 19 interposed therebetween. At this time, the tab 13b that projects into the connector accommodating portion 20 is set in correspondence with the tab insertion hole 11j formed in the bottom surface of the lower case 11.

Next, the bus bar pressing cover 18 is installed on the upper surface of the uppermost bus bar 13A. That is, the bus bar retainer cover 18 is placed over the installation position of the electronic circuit board 14 from above, and as shown in FIGS. 5A and 5B, the engaged portion 11h provided on the standing wall 11g of the lower case 11 is attached to the bus bar retainer cover. The busbar retainer cover 1 with the retaining claws 18d provided on the peripheral edge of the retainer 18 retained and the busbar 13 held from above.
8 is fixed. Thereby, the bus bar 13 can be fixed to the lower case 11.

Next, the electronic circuit board 14 is assembled at the installation position above the bus bar 13. The electronic circuit board 14 includes
In advance, the housing 16 accommodating the connection terminals 17 is laterally fitted to both the left and right sides, and the electronic circuit side electric connection portions 17 of the connection terminals 17 are connected to the respective circuit portions 14a around the outside of the electronic circuit board 14.
a is connected. The tab 1 in which the electronic circuit board 14 with the housing 16 attached thereto has the busbar-side electrical connection portion 17b of the connection terminal 17 protruding upward from the busbar 13
It is set on the upper surface of each pedestal 11c of the lower case 11 while fitting into the 3a from above.

When the electronic circuit board 14 is set on the bus bar 13, the housing 16 is located on the upper surface of the bus bar 13A, and in the notch 16b formed in the housing 16,
The protrusion 18e protruding from the bus bar pressing cover 18 is fitted. As a result, the bus bar pressing cover 18 can be reliably positioned and fixed on the upper surface of the bus bar 13.

After the electronic circuit board 14 is set as described above, the lower case 11 is covered with the upper case 12, and the electronic circuit board 14 is pressed against the pedestal 11c of the lower case 11 via each housing 16 by each pressing shoulder 12c. The electronic circuit board 14 is fixed in the lower case 11 and the upper case 12.

Electrical junction box 1 assembled as described above
In No. 0, since the bus bar pressing cover 18 is located on the upper surface of the uppermost bus bar 13A, when the mating connector (not shown) is inserted into the connector accommodating portion 20 provided in the lower case 11, the insertion force of the bus bar 13 Can be prevented from rising. Therefore, the electronic circuit board 14
The connector accommodating portion 20 for electrically connecting to an external circuit or the like can be formed at a position of the lower case corresponding to the installation position of.

The bus bar fixing structure of the present invention is not limited to the above structure. For example, instead of the guide portion 18h of the busbar pressing cover 18 shown in FIG.
As shown in (B) and (C), guide portions 11k, 11k may be provided on both sides of the locked claw 11h so as to project in a pair in the vertical direction from the standing wall 11g. The guide portions 11k and 11k are provided with first tapered surfaces 11m and 11m, respectively, which incline downward from the upper end surface toward the inner side, and second inclined surfaces 11n incline downward from the upper end surface toward the projecting end. , 11n are provided.

The interval L between the guide portions 11k and 11k is
The width H of the claw 18f of the bus bar pressing cover 18 is set to be substantially the same as that of the claw 18f when the bus bar pressing cover 18 is attached.
The bus bar pressing cover 18 can be positioned by locating h above the locked claw 11h. In the guide portions 11k and 11k, the first taper surfaces 11m and 11m and the second taper surfaces 11n and 11n are used.
By this, the claw 1 of the locking claw 18d of the busbar pressing cover 18
8h smoothly guided between each other and locked claw 11h
Can be locked.

[0033]

As is apparent from the above description, in the bus bar fixing structure of the electric connection box with an electronic circuit according to the present invention, the electronic circuit board provided inside the case is installed at a position where the electronic circuit board is housed in another case. Since the electronic circuit board is not housed and the electronic circuit board is housed without a case, a dedicated case for housing the electronic circuit board is not required, and the cost is reduced and the electrical junction box is downsized. Moreover, in that case, the upper surface of the bus bar located directly below the electronic circuit board,
Since the bus bar is held down by the bus bar holding cover, it is possible to reliably prevent the bus bar from being lifted up. Therefore, it is possible to provide the connector accommodating portion in the lower case located right below the electronic circuit board. As a result, the space of the electric junction box can be effectively used.

The bus bar pressing cover can be easily installed at a predetermined position because the protruding locking claws are locked to the locked claws of the lower case. Further, if a protrusion is provided on the busbar pressing cover and the protrusion is fitted into the notch of the hanging attached to the electronic circuit board and pressed by the hanging, the positioning can be held more reliably, and the busbar can be easily prevented from rising.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a state in which an electric connection box with an electronic circuit of the present invention is assembled.

FIG. 2 is an exploded perspective view of an electric junction box.

FIG. 3 is an exploded sectional view of an electric junction box.

FIG. 4 shows a busbar pressing cover of the present invention, (A)
Is a perspective view, (B) is an I-I sectional view of (A), and (C) is a II-II sectional view of (A).

5 (A) and 5 (B) are cross-sectional views showing a process of locking the locking claws of the busbar pressing cover.

FIG. 6 is a cross-sectional view showing a fitted state of a protrusion of a bus bar pressing cover.

FIG. 7 shows a modified example of the locked claw formed on the lower case, (A) is a plan view, (B) is a sectional view taken along line III-III of (A), and (C) is taken along line IV-IV of (B). A sectional view and (D) are perspective views of a main part.

FIG. 8 shows a conventional electric junction box, (A) an exploded perspective view of the electric junction box and the case, (B) a cross-sectional view showing a state in which the electric junction box and the case are assembled, (C) a connection It is a side view of a terminal.

[Explanation of symbols]

 10 Electrical Connection Box 11 Lower Case 11c Pedestal 12 Upper Case 13 Busbar 13A Top Busbar 13a Tab 14 Electronic Circuit Board 16 Housing 17 Connection Terminal 18 Busbar Press Cover 18d Locking Claw 18e Protrusion 20 Connector Housing

Claims (4)

[Claims] 1. An electronic circuit board is accommodated above a part of an insulating plate and a bus bar which are laminated on a lower case, and a connector accommodating portion is provided in a lower case portion below the electronic circuit board. A busbar fixing structure in an electric junction box with an electronic circuit, characterized in that a busbar pressing cover is installed on the upper surface of the uppermost busbar stacked below the circuit board. 2. A busbar retainer cover is fixed to the upper surface of the busbar by projecting locking claws on the peripheral edge of the busbar retainer cover and engaging with the engaged claws provided on the standing wall projecting from the lower case. The busbar fixing structure in the electric connection box with an electronic circuit according to claim 1. 3. A bus bar retainer cover is provided with a projection on its peripheral edge, and a housing for receiving a connection terminal attached to the electronic circuit board is provided with a notch for fitting the projection, and the electronic circuit board is projected from a lower case. 2. The busbar pressing cover is fixed on the upper surface of the busbar by mounting it on a pedestal and fixing it, and fitting the projection of the busbar pressing cover into the notch of the housing attached to the electronic circuit to fix the busbar pressing cover on the upper surface of the busbar. The busbar fixing structure in the electric connection box with an electronic circuit according to 2. 4. The connection terminal accommodated in the housing,
An electrical connection portion is provided for connecting a circuit portion of the electronic circuit board and a tab provided on the bus bar, and a housing accommodating the connection terminal is laterally fitted to the peripheral edge of the electronic circuit board to form the connection terminal and the circuit. The connecting terminals housed in the housing attached to the electronic circuit board are fitted to the tabs of the bus bar from above, and the pedestal protruding from the lower case and the pressing shoulder provided on the upper case The bus bar fixing structure for an electric connection box with an electronic circuit according to claim 1, wherein the electronic circuit board is sandwiched and fixed by the method.