JP3139357B2 - Busbar fixing structure in electrical junction box with electronic circuit - Google Patents

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 wiring harness for an automobile, and more particularly, to a connector case 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 shown in FIGS. 8A, 8B and 8C, this type of electric connection box with an electronic circuit has an electronic circuit board 3 in a case 2 separate from the electric connection box 1. As shown in FIG. On the other hand, on the tab 4a projecting upward from the bus bar 4 housed in the electric connection box 1, the bus bar side electric connection part of the connection terminal 5 housed in the housing part 1a formed on the outer surface of the electric connection box 1 5a is fitted from above, and the rail 2 of the case 2 is inserted into the rail grooves 1b, 1b on the outer surface of the electric connection box 1.
b, 2b, while inserting the circuit portion 3a of the electronic circuit board 3.
To the electronic circuit-side electric connection portion 5b of the connection terminal 5 from the side, so that the bus bar 4 of the electric connection box 1 and the electronic circuit board 3
And the circuit section 3a. (See JP-A-58-182414)

[0003]

However, the conventional electric connection box 1 with an electronic circuit requires a case 2 for accommodating the electronic circuit board 3 separately from the electric connection box 1, so that the cost is increased. Therefore, it is conceivable that the electronic circuit board is disposed above the bus bar without a case and is accommodated inside the electric connection box. In this case, since there is no means for fixing the bus bar, a position facing the electronic circuit board is considered. The connector housing cannot be provided in the lower case.

That is, when a connector housing is provided at a position facing the electronic circuit board and a mating connector is inserted, there is a problem that the insertion pressure causes a bus bar provided with a tab to be fitted with a terminal of the connector to be lifted. In particular, when the bus bars are stacked and set, if the tab for connector connection is protruded from the bus bar located at the highest position, there is a problem that the bus bar at the highest position is easily lifted. As described above, since the connector accommodating portion cannot be disposed directly below the electronic circuit board, space is wasted, restrictions are increased in designing the bus bar, and there is a problem that effective wiring cannot be performed.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object 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. And

[0006]

In order to achieve the above-mentioned object, the present invention is to accommodate an electronic circuit board above a part of an insulating plate and a bus bar which are laminated on a lower case, and to position the electronic circuit board below the electronic circuit board. The connector housing portion is provided in the lower case part, and, on the upper surface of the uppermost bus bar laminated below the electronic circuit board, a bus bar holding cover is installed, and a projection is provided on the periphery of the bus bar holding cover, A notch for fitting the projection is provided in a housing for accommodating the connection terminal attached to the electronic circuit board, and the electronic circuit board is mounted and fixed on a pedestal protruding from the lower case,
A bus bar fixing structure is provided in an electric connection box with an electronic circuit in which a projection of a bus bar pressing cover is fitted into a cutout of the housing attached to the electronic circuit board to fix the bus bar pressing cover on the upper surface of the bus bar. . It is preferable that a locking claw protrudes from a peripheral edge of the busbar holding cover and is locked with a locked claw provided on an upright wall protruding from the lower case to fix the busbar holding cover to the upper surface of the busbar.

Further, according to the present invention, an insulating plate and a bus bar are laminated on a lower case, and a bus bar holding cover is provided on a part of the upper surface of the uppermost bus bar and at a position which does not interfere with a tab protruding from the bus bar. A locking claw protrudes from a peripheral edge of the busbar holding cover, and is locked with a claw provided on an upright wall protruding from the lower case, thereby fixing the busbar holding cover to the upper surface of the busbar, while the busbar holding cover is being fixed. A bus bar fixing structure in an electric connection box with an electronic circuit, wherein an electronic circuit board is installed at a position above the electronic circuit board, and a connector housing portion is provided at a lower case portion at a position below the electronic circuit board. I have.

Further, according to the present invention, an insulating plate and a bus bar are stacked and arranged on a lower case, and a bus bar holding cover is provided on a partial upper surface of the uppermost bus bar and at a position not interfering with a tab protruding from the bus bar. A battery circuit board is installed at a position above the bus bar holding cover, and a projection is provided on a peripheral edge of the bus bar holding cover, while a cutout for fitting the projection is provided in a housing for accommodating a connection terminal attached to the electronic circuit board. The electronic circuit board is placed and fixed on a pedestal protruding from the lower case, and the projection of the bus bar holding cover is fitted into the notch of the housing attached to the electronic circuit, and the bus bar holding cover is fixed to the upper surface of the bus bar. The present invention provides a bus bar fixing structure in an electric junction box with an electronic circuit.

As described above, in the electric junction box of the present invention,
At 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 housed without a case without housing the electronic circuit board in a state where it is housed in another case. Since the upper surface of the bus bar on 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 float. Therefore, the connector housing portion can be provided in the lower case located directly below the electronic circuit board, and the space can be effectively used.

[0010] The connection terminals housed in the housing include:
An electrical connection portion for connecting a circuit portion of the electronic circuit board to a tab provided on the bus bar; a housing accommodating the connection terminal is fitted to a periphery of the electronic circuit board from a side to connect the connection terminal and the circuit; And the connection terminals accommodated in the housing attached to the electronic circuit board are fitted into the tabs of the bus bar from above, and a pedestal protruding from the lower case and a holding shoulder provided on the upper case. The electronic circuit board is pinched and fixed. (Claim 4)

As described above, when the electronic circuit board is sandwiched and fixed between the pedestal and the holding shoulder, the electronic circuit board and the housing can be positioned in the vertical direction. The terminals can be reliably connected to the circuit section and the bus bar.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings. As shown in FIGS. 1 to 6, the electric connection box 10 includes a rectangular box-shaped lower case 11 and an upper case 12 made of a synthetic resin.
When the upper case 12 is put on the lower case 11, the respective lock claws 12b of the outer surface 12a of the upper case 12 are engaged with the respective lock claws 11b of the outer surface 11a of the lower case 11, so that the upper case 12 is locked and fixed to the lower case 11. I have to.

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

A bus bar holding cover 18 is provided on the upper surface of a part of the uppermost bus bar 13A to prevent the bus bar 13 from rising. The installation position of the bus bar holding cover 18 is below the installation position of the electronic circuit board 14 described later. At positions other than the installation position of the electronic circuit board 14, the uppermost bus bar is positioned and held by the upper case 12 to prevent the bus bar 13 from rising.

As shown in FIG. 4, the bus bar press cover 18 has a rectangular press plate portion 18a, and an outer wall portion 18b projecting upward from an outer peripheral edge of the press plate portion 18a. A reinforcing rib 1 is provided inside the outer wall portion 18b.
8c is provided. Further, a locking claw 18d protrudes downward from a peripheral edge on the short side, and a projection 18e is provided laterally from a peripheral edge on the long side. At the four corners of the busbar holding cover 18, guide portions 18h projecting in an L-shape are provided.
Is protruding. The busbar holding cover 18 is set to be smaller than a space between housings 16 for accommodating connection terminals, which will be described later, attached to the left and right sides of the electronic circuit board 14, and is fitted with the connection terminals 17 accommodated in the housing 16.
The dimensions are set so as not to interfere with the tab 13a protruding from the third tab.

As shown in FIGS. 5 (A) and 5 (B), the lower claw 18f of the lower claw 18d is
The bus bar holding cover 18 is locked with the claw 11h provided on the opposed standing wall 11g of the
A is fixed to the upper surface of A in a pressed state.

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

In this embodiment, locking means 18 d and projections 18
e, but the locking claw 18d or the projection 18e
A configuration in which only one of them is provided may be adopted.

The lower case 11 has an electronic circuit board 14
The connector accommodating portion 20 is located immediately below the position corresponding to the
Are integrally molded. A plurality of tab insertion holes 11j are provided on the bottom surface of the lower case 11 located in the connector accommodating portion 20.
And a plurality of tabs 13b including tabs 13b projecting downward from the uppermost bus bar 13A are projected into the connector accommodating portion 20.

The busbar 1 is provided at two corners on the right side in the longitudinal direction of the upper surface of the lower case 11 and at a substantially intermediate portion in the longitudinal direction.
A total of four pedestals 11c,..., 11c for mounting the electronic circuit boards, which protrude to a position higher than 3, are erected. Each pedestal 1
The outer surface 1c is formed so as to be flush with the outer surface 11a of the lower case 11. The upper part of the pedestal 11c is an electronic circuit accommodating portion, and the electronic circuit board 1 accommodated in the electronic circuit accommodating portion is provided.
4 is formed in 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 mounted on the upper surface of the electronic circuit board 14, and a printed circuit section for electrically connecting the electronic components 15 is mounted on the lower surface of the electronic circuit board 14. (Not specifically shown).
A circuit portion 14a continuous with the printed circuit portion is formed around the outer periphery of both sides of the upper surface of the electronic circuit board 14.

The housings 16 and 16 which are detachably attached to the electronic circuit board 14 are made of synthetic resin in a substantially harmonica shape, and accommodate the connection terminals 17 in a large number of terminal accommodating chambers 16a arranged in parallel with the respective housings 16. ing. A notch 16 for fitting the projection 18e is provided at a lower end of the bus bar holding cover 18 at a position facing the projection 18e.
b is provided.

Each of the connection terminals 17 is connected to a circuit portion 14 a of the electronic circuit board 14 from the side and is electrically connected to the circuit portion 14 a. The bus bar 13 of the lower case 11 projects upward. An electrical connection portion 17b fitted to the tab 13a to be fitted from above is provided in a direction orthogonal to the tab 13a. Each of the housings 16 is set in advance on the electronic circuit board 14 by fitting an electric connection portion 17a of the accommodated connection terminal 17 on the electronic circuit side to the circuit portion 14a of the electronic circuit board 14 from the side.

When the electronic circuit board 14 is set from above on the upper surface of the pedestal 11c, the housing 1 attached to the outer periphery on both sides of the electronic circuit board 14 is placed in the electric connection box 10.
Guide ribs 11f, 11f for positioning 6, 6 and 16 project from lower case 11, and guide ribs 19
a protrudes from the insulating plate 19 laminated on the bus bar 13. Further, as shown in FIGS. 1 to 3, on the upper part of the inner surface of the upper case 12, when the upper case 12 is put on the lower case 11 and locked, the holding shoulders 12c, which come into contact with the upper surface of each of the housings 16, are provided. 12c is formed, and four corners of the electronic circuit board 14 are pressed onto the upper surface of each pedestal 11c of the lower case 11 via each housing 16 by each holding 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 part of the standing wall 11g of the lower case 11 with the insulating plate 19 interposed therebetween. At this time, the tab 13b protruding 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 holding cover 18 is installed on the upper surface of the uppermost bus bar 13A. That is, the bus bar holding 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 bus bar holding cover 11 h is provided on the locked portion 11 h provided on the vertical wall 11 g of the lower case 11. The bus bar pressing cover 1 is locked in a state where the locking claws 18d provided on the peripheral edge of the bus bar 18 are locked and the bus bar 13 is pressed 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
The housing 16 accommodating the connection terminal 17 is previously fitted to the left and right sides from the side, and the electronic circuit-side electric connection portion 17 of the connection terminal 17 is fitted to each of the circuit portions 14 a around the outside of the electronic circuit board 14.
a is connected. The electronic circuit board 14 to which the housing 16 is attached is connected to the tab 1 on which the electric connection portion 17 b of the connection terminal 17 on the bus bar side is projected upward from the bus bar 13.
The lower case 11 is set on the upper surface of each pedestal 11c while being fitted to the upper part 3a.

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.
A projection 18e protruding from the busbar holding cover 18 is fitted. Thereby, the bus bar holding 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 upper case 12 is put on the lower case 11, and the electronic circuit board 14 is pressed against the pedestal 11c of the lower case 11 via the respective housings 16 with the respective holding shoulders 12c. Then, the electronic circuit board 14 is fixed in the lower case 11 and the upper case 12.

The electric junction box 1 assembled as described above
No. 0 indicates that when a mating connector (not shown) is inserted into the connector accommodating portion 20 provided in the lower case 11 because the busbar holding cover 18 is located on the upper surface of the uppermost busbar 13A, the busbar 13 Can be prevented from floating. Therefore, the electronic circuit board 14
The connector accommodating portion 20 for electrical connection with an external circuit or the like can be formed at the 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 configuration. For example, instead of the guide portion 18h of the bus bar holding cover 18, FIG.
(B) As shown in (C), a pair of guide portions 11k, 11k protruding vertically from the standing wall 11g may be provided on both sides of the locked claw 11h. These guide portions 11k, 11k are provided with first tapered surfaces 11m, 11m respectively inclined downward toward the inside facing the upper end surface, and second tapered surfaces 11n inclined downward toward the protruding end side from the upper end surface. , 11n.

The distance L between the guides 11k, 11k is
The width H of the claw 18f of the busbar holding cover 18 is set to be substantially the same as that of the busbar holding cover 18.
By positioning h above the claw 11h to be locked, the bus bar pressing cover 18 can be positioned. In the guide portions 11k, 11k, the first tapered surfaces 11m, 11m and the second tapered surfaces 11n, 11n
As a result, the claw 1 of the locking claw 18d of the busbar holding cover 18
8h are smoothly guided between each other to lock the claw 11h.
Can be locked.

[0033]

As is apparent from the above description, in the bus bar fixing structure of the electric junction box with an electronic circuit according to the present invention, the electronic circuit board provided inside the case is installed in another case in a state where it is housed in another case. Since the electronic circuit board is accommodated without a case without accommodating the electronic circuit board, a special case for accommodating the electronic circuit board is not required, thereby reducing the cost and reducing the size of the electric connection box. Moreover, in that case, the upper surface of the bus bar located directly below the electronic circuit board is
Since the bus bar is held down by the bus bar holding cover, the bus bar can be reliably prevented from being lifted up, so that the connector housing portion can be provided in the lower case located directly below the electronic circuit board. As a result, the space of the electric junction box can be effectively used.

Further, the bus bar holding cover has the protruding locking claws locked with the locked claws of the lower case, so that it can be easily installed at a predetermined position. Further, when the bus bar holding cover is provided with a projection, fitted into a notch of a housing to be attached to the electronic circuit board, and held down by the soldering, the positioning can be held more reliably and the bus bar can be easily prevented from floating.

[Brief description of the drawings]

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

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

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

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

FIGS. 5A and 5B are cross-sectional views showing a step of locking a locking claw of a busbar pressing cover.

FIG. 6 is a cross-sectional view showing a fitting state of a projection of a busbar holding cover.

FIGS. 7A and 7B show a modified example of a locked claw formed on a lower case, wherein FIG. 7A is a plan view, FIG. 7B is a cross-sectional view taken along the line III-III of FIG. FIG. 3D is a cross-sectional view, and FIG.

8A and 8B show a conventional electric connection box, FIG. 8A is an exploded perspective view of the electric connection box and the case, FIG. 8B is a cross-sectional view showing an assembled state of the electric connection box and the case, and FIG. It is a side view of a terminal.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Electric connection box 11 Lower case 11c Pedestal 12 Upper case 13 Bus bar 13A Top bus bar 13a Tab 14 Electronic circuit board 16 Housing 17 Connection terminal 18 Bus bar presser cover 18d Locking claw 18e Projection 20 Connector accommodating part

Claims (5)

(57) [Claims] An electronic circuit board is accommodated above a part of an insulating plate and a bus bar which are stacked and arranged on a lower case, and a connector accommodating portion is provided in a lower case portion below the electronic circuit board. A bus bar holding cover is provided on the upper surface of the uppermost bus bar laminated below the circuit board, and a projection is provided on the periphery of the bus bar holding cover, while the projection is provided on a connection terminal housing to be attached to the electronic circuit board. The electronic circuit board is mounted and fixed on a pedestal protruding from the lower case, and the projection of the bus bar holding cover is fitted into the notch of the housing attached to the electronic circuit board. A busbar fixing structure in an electric connection box with an electronic circuit, in which a busbar retainer cover is fixed on an upper surface of the busbar. 2. The bus bar press cover is provided with a locking claw projecting from a peripheral edge thereof, and is locked with a claw to be locked provided on an upright wall protruding from the lower case, thereby fixing the bus bar pressing cover to the upper surface of the bus bar. A busbar fixing structure in the electric junction box with an electronic circuit according to claim 1. 3. An insulating plate and a bus bar are stacked and arranged on a lower case, and a bus bar press cover is installed on a partial upper surface of the uppermost bus bar and at a position not interfering with a tab protruding from the bus bar. A locking claw protrudes from the periphery and is locked with a claw provided on an upright wall protruding from the lower case, thereby fixing the busbar holding cover to the upper surface of the busbar, while the busbar holding cover is positioned above the busbar holding cover. A housing for connecting terminals to be mounted on the electronic circuit board while a connector housing is provided in a lower case portion below the electronic circuit board and a projection is provided on a peripheral edge of the bus bar holding cover. The electronic circuit board is mounted and fixed on a pedestal protruding from the lower case, and the housing is attached to the electronic circuit board. Busbar securing structure in the grayed the fitted projections busbar pressing cover the notch, the electronic circuit with an electrical junction box that secures the busbar pressing cover on the upper surface of the bus bar. 4. An insulating plate and a bus bar are stacked and arranged on a lower case, and a bus bar press cover is set on a part of the upper surface of the uppermost bus bar and at a position not interfering with a tab protruding from the bus bar. An electronic circuit board is installed at an upper position, and a projection is provided on a peripheral edge of the bus bar holding cover, while a notch for fitting the projection is provided in a housing for accommodating a connection terminal attached to the electronic circuit board. The busbar holding cover is fixed to the upper surface of the busbar by mounting and fixing on the pedestal protruding from the lower case, fitting the projection of the busbar holding cover into the cutout of the housing attached to the electronic circuit board. Busbar fixing structure in electrical junction box with electronic circuit. 5. A connection terminal housed in the housing,
An electrical connection portion for connecting a circuit portion of the electronic circuit board to a tab provided on the bus bar; a housing accommodating the connection terminal is fitted to a periphery of the electronic circuit board from a side to connect the connection terminal and the circuit; And the connection terminals accommodated in the housing attached to the electronic circuit board are fitted into the tabs of the bus bar from above, and a pedestal protruding from the lower case and a holding shoulder provided on the upper case. The bus bar fixing structure in the electric connection box with an electronic circuit according to claim 3 or 4, wherein the electronic circuit board is sandwiched and fixed by (5).