JPH11285132A - Electrical junction box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrical junction box which does not have densely mounted electrical components on its upper surface and, furthermore, does not use stepped tabs which may cause troubles. SOLUTION: An upper wiring board 31, composed of an insulating board 40 and bus-bars 41 and 42 which are provided on the insulating board 40 and have standing tabs 43-46 formed on their ends and a standing wiring board 26 composed of an insulating board 47 which is placed in a state of crossing with respect to the upper wiring board 31 and a plurality of bus-bars 48 which are provided on the insulating board 47 which have bent tabs 50 and 51' formed respectively on their lower parts, protruding from both the sides of the insulating board 47 and have flat tabs 49 extending upward are provided in the case of an electrical junction box. Both the end parts of the bent tabs 50 and 50' protrude into attachment parts provided on both the sides of the case to be electrically connected to electrical components which do not required frequent maintenance.

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 used for wiring of an automobile or the like.

[0002]

BACKGROUND ART FIG. 7 is an exploded perspective view of the electrical junction box A ₁ in the conventional example, a plurality of wiring board 1 which is disposed a plurality of bus bars 3 on the insulating plate 2, layered in the interior of the lower cover 4 An upright tab 3a, which is housed in a state and bent upward from the end of the bus bar 3, protrudes from the surface of the uppermost wiring board 1 through the insulating plate 2 stacked upward, and a relay terminal is provided at the end thereof. 5 is fitted. A hanging tab (not shown) bent downward from the end of the bus bar 3 penetrates the insulating plate 2 stacked below and is inserted into the connector insertion portion 6 of the lower cover 4 (not shown). Is electrically connected to

A fuse 8, a fusible link 9, and a fuse 8 are provided on the upper surface of an upper cover 7 which is put on the stacked wiring boards 1.
A relay 10 and the like are inserted, and a connector insertion portion that accommodates a terminal connector of the wire harness is provided in addition thereto. These electric devices are connected to the bus bar 3 via the relay terminal 5. Due to an increase in the number of internal circuits due to a rapid increase in on-board electrical components, and mounting of an electronic unit having a built-in control circuit for these electrical components, there is a shortage of space for mounting electrical devices and wire harness mounted on the upper surface of the upper cover 7. There is a problem and the installation density is high and there is a problem such as receiving thermal interference,
Insertion parts can now be provided on the side of the electrical junction box.

[0004] Examples of an electric connection box in which an insertion portion is also provided on the side surface include, for example, Japanese Utility Model Laid-Open No. 4-61417 and Japanese Patent Laid-Open No. 5-3
No. 619, for example. 4-61
Electrical connection box A ₂ described in JP 417, as shown in the perspective view of FIG. 8, composed of a laminated bus bar wiring board B and the insulating casing C to accommodate this, the insulating case C is upper case C _a, lower case C _b, it is constituted by the side casing C _c, a plurality of the fuse cavity on the side case C _c 1
One or more connector insertion portions 12 are provided.

[0005] The laminated bus bar wiring board B is composed of two insulating plates 1
It is composed of a plurality of bus bars 14 disposed on the upper and lower surfaces and the intermediate surface of each of the insulating plates 13 and 13 ', and side plates 15 and 15' suspended from one side of the insulating plates 13 and 13 '. The bus bar 14 has a stepped tab 16 whose middle portion is bent in a crank shape so as to correspond to the fuse cavity 11 and the connector insertion portion 12, and a flat tab 17 which is not bent in a crank shape. A step tab similar to the step tab 16 is also used in the electric connection box described in Japanese Patent Application Laid-Open No. 5-3619.

[0006]

The step tab 16 has a problem that the machining is complicated because the intermediate portion is bent into a crank shape, a problem that the dimensional accuracy is deteriorated, and a problem that the step tab 16 has a problem.
And the like, there is a problem that the assemblability of the bus bar 14 having the above is deteriorated. The present invention aims to solve such problems,
Without densely mounting electrical components on the top surface, and
An object of the present invention is to provide an electric junction box which does not use a stepped tab and has the above-mentioned problem.

[0007]

In order to achieve the above-mentioned object, an electric connection according to the present invention has an upper surface on which an insertion portion for an electric component necessary for maintenance is provided, and an electric connection portion for inserting another electric component on a side surface. A case in which a portion is provided, and a plurality of bus bars are arranged on an insulating plate housed in the case, at an end of the bus bar,
An upper wiring board in which an upstanding tab protruding into the insertion portion on the upper surface is formed to be bent, and a plurality of bus bars are arranged on an insulating plate arranged in a cross shape with respect to the upper wiring board, and one of the bus bars is provided. A bent tab protruding into the insertion portion on the side surface is formed at an end, and an upright wiring board provided with a flat tab protruding into the insertion portion on the upper surface is provided at the other end. It is assumed that.

[0008] An upper edge of the upright wiring board may intersect with an end of the upper wiring board, or an upper edge of the plurality of upstanding wiring boards may be located at an intermediate portion of the upper wiring board. Can be configured to intersect.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. Figure 1 is a longitudinal sectional view of the electrical junction box C ₁ showing a first embodiment of the present invention, FIG 2 is an exploded perspective view of FIG. As shown in FIG. 2, the electric junction box C ₁
The case 20 has a horizontal wall 21a at the upper end of the vertical wall 21a.
b, an L-shaped side cover 21, a side cover 22 overlapping the vertical wall portion 21a, and a main cover 2 placed on the overlapped side covers 21, 22.
And 3.

On the end face of the side cover 22, an inclined surface 24a is formed in the direction of the side cover 21, and a locking projection 24 formed with a locking surface 24b on the opposite side is protrudingly provided. Is provided with a locking piece 25 protruding in the direction of the side cover 22, and the locking piece 25 has a locking hole 25a.
Is provided. Therefore, when the side covers 21 and 22 are overlapped, the locking projections 24 are engaged with the locking holes 25a so that the two side covers 21 and 22 are joined to form a space for accommodating the upright wiring board 26 therein. You.

One surface (right side in FIG. 1) of the upright wiring board 26 housed inside the side covers 21 and 22 is connected to a relay mounting portion 27 provided on a vertical wall portion 21a of the side cover 21. 27, and the other surface abuts the bottom surface of the connector insertion portion 28 provided on the side cover 22. The main cover 23 is put on the upper surfaces of the side covers 21 and 22, and the locking projections 29 provided on the peripheral wall surfaces of the side covers 21 and 22 engage with the locking holes 30 provided in the main cover 23, and 23 is fixed to the side covers 21 and 22, and a space for accommodating the upper wiring board 31 (see FIGS. 1 and 3) is formed therein.

The upper surface of the main cover 23 is a surface that is easy to maintain. The fuse insertion portion 32 for inserting the fuse 35, the fusible link 36, and the relay 37, which are the electrical components required for maintenance, and the fusible link insertion, respectively. The part 33 and the relay insertion part 34 are provided on this surface (see FIGS. 1 to 3). On the other hand, the relay 38 and the connector 39 which do not require much maintenance are the case 20.
Is inserted into the relay insertion portion 27 and the connector insertion portion 28 on the side surface of the main cover 23, the installation density of the electric components installed on the upper surface of the main cover 23 is reduced, and problems such as being subject to thermal interference are solved.

As shown in FIG. 3, the upper wiring board 31 has bus bars 41 and 42 provided on an insulating plate 40, and bus bars 4 and 42 are provided.
Upright tabs 43 and 44 are formed at one end of the bus bar 42. The upright tabs 45 and 46 that bend upward from the end of the bus bar 42 penetrate the insulating plate 40, and stand up tabs 43 to 46.
Are inserted into the insertion portions 32-34 of the main cover 23, and are electrically connected to electric components required for maintenance.

The upright wiring board 26 has an upper end portion on the upper wiring board 3.
A plurality of standing busbars 48 are arranged in a horizontal direction on an insulating plate 47 which intersects the upper wiring board 31 at a right angle while being in contact with one end (left end) of the busbar 4.
8, a flat tab 49 formed at the upper end of the main cover 23
Is inserted into the insertion portion 32. The flat tab 49 inserted into the insertion portion 32 is connected to the bus bar 41 inserted into the insertion portion 32,
42, and are electrically connected to the upright tabs 44 and 46 via the fuse 35 and the relay terminal.

At the lower ends of the plurality of bus bars 48, there are provided a bent tab 50 which is bent leftward and protrudes in FIG. 3, and a bent tab 50 'which is bent rightward and protrudes. Bus bars 5 of various shapes are provided below the bending tabs 50 and 50 '.
1 and 51 'are provided. The bus bar 51 is disposed on the left surface of the insulating plate 47 in FIG. 3, and the bus bar 51' is disposed on the right surface of the insulating plate 47 in FIG. Busbar 51,5
A bent tab 51a that bends and protrudes to the right of the insulating plate 47 and a bent tab 51b that protrudes and bends leftward are provided at both ends of 1 '.

The bent tabs 50 and 51b which are bent to the left and project are connected to the connector 39 of the connector insertion portion 28, and the bent tab 50 'and the bent tab 51a are connected to the relay insertion portion 2
7 relay 38. As described above, since the mounting of electrical components that do not require much maintenance to the side of the electrical connection box C _1, the upper surface of the electrical connection box C ₁ can be made smaller than conventional, and is disposed on the upper surface The thermal performance of the electrical components is improved.

FIG. 4 shows an electric connection box C according to a second embodiment of the present invention.
₂ is different from the electric junction box C ₁ of the first embodiment in that the upper ends of a plurality of (two in this embodiment) standing upright wiring boards 26, 26 are connected to an upper wiring board 31. 5 in such a manner as to be brought into contact with the middle part of the lower surface of
), The shape of the case 20 is different due to the difference in the combination state.

As shown in FIG. 4, the case is electrical connection box C _2, a side cover 52 of the L-shaped horizontal wall portion 52b is provided at the upper end of the vertical wall portion 52a, the horizontal to the upper end of the vertical wall portion 53a It is composed of an L-shaped side cover 53 provided with a wall 53b, and a main cover 54 placed on the overlapped side covers 52,53. The main cover 54 is provided with the fuse insertion portions 32 in two rows,
Flat tabs 49 projecting upward from the respective standing wiring boards 26, 26 project into the fuse insertion portions 32 in each row (see FIGS. 5 and 6).

[0019] Since the fuse insertion portions 32 in the main cover 54 is provided in two rows, it is possible to shorten the length of the main cover 54 longitudinally, the electrical connection box C ₂ can be downsized. Further, since one of the plurality of (two in this embodiment) standing wiring boards 26 can be selected and connected to one of the flat tabs 49, there is an advantage that the degree of freedom in circuit arrangement is increased.

On the upper surface of the main cover 54, the relay insertion portion 3
4 and a fusible link insertion portion (not shown) are provided, and the side cover 52 is provided with a relay insertion portion 27,
The connector cover 28 is provided on the side cover 53, and the bent tabs 50, 50 'protruding from the upright wiring boards 26, 26 are provided.
Is inserted into the connector insertion portion 28 and the relay insertion portion 27 as in the first embodiment.

[0021]

Since the present invention is configured as described above, it has the following effects. (1) By installing only the electrical components required for maintenance on the upper surface of the case that is easy to maintain, and installing other electrical components on the side of the case, the upper surface of the case can be installed even if the number of electrical components installed in the case increases dramatically. Conventional problems such as increased density and thermal interference have been eliminated. (2) The upper wiring board with the bus bar provided on the insulating board and the upright wiring board are arranged in an intersecting manner, the upstanding tab is bent and formed on the bus bar of the upper wiring board, and the upstanding wiring board is bent from the end of the bus bar. A bent tab whose tip is inserted into the insertion portion on the side of the case,
A flat tab that protrudes flat from the end of the bus bar and whose tip is inserted into the insertion part on the upper surface of the case is provided, so that the middle part is cranked like a conventional electric junction box with an insertion part on the side of the case. It is not necessary to use a stepped tab bent in a shape, and the assemblability of the bus bar is improved. (3) When a plurality of standing wiring boards are stacked, the insertion portions arranged on the upper surface of the case can be arranged in a plurality of rows. There is an advantage that there is a degree of freedom in selecting a tab to be formed, and since a large number of bent tabs can be projected from both sides of the overlapped standing wiring board, the structure of the standing wiring board can be simplified, and parts production can be performed. In addition, there is an advantage that the number of assembling steps can be reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an electric junction box according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view of FIG.

FIG. 3 is a perspective view illustrating the structure of a wiring board disposed on the intersection in FIG. 1;

FIG. 4 is a vertical sectional view of an electric junction box according to a second embodiment of the present invention.

FIG. 5 is a perspective view of the electric junction box of the second embodiment during assembly.

FIG. 6 is a longitudinal sectional view of a main part of a wiring board disposed on an intersection of an electric junction box according to a second embodiment.

FIG. 7 is an exploded perspective view of a conventional electric junction box.

FIG. 8 is an exploded perspective view of another conventional electric junction box.

[Explanation of symbols]

C ₁ , C ₂ electrical connection box 20 case 21, 22, 52, 53 side cover 23, 54 main cover 26 upright wiring board 27 relay insertion part 28 connector insertion part 31 upper wiring board 32 fuse insertion part 33 fusible Link insertion part 34 Relay insertion part 36 Fusible link 37 Relay 40, 47 Insulating plate 41, 42, 48 Bus bar 43, 44, 45, 46 Standing tab 49 Flat tab 38 Relay 39 Connector 50 Bending tab

Claims (3)

[Claims] 1. A case in which an insertion portion for an electric component required for maintenance is provided on an upper surface and an insertion portion for another electric component is provided on a side surface, and a plurality of insulating plates accommodated in the case are provided. An upper wiring board on which a bus bar is provided, and an upright tab protruding into the insertion portion on the upper surface is formed at an end of the bus bar, and an insulating plate provided in a cross shape with respect to the upper wiring board. A plurality of busbars are provided, and at one end of the busbar, a bent tab projecting into the insertion portion on the side surface is formed, and at the other end, a flat tab projecting into the insertion portion on the upper surface is formed. An electric connection box, comprising: an upright wiring board provided. 2. The electrical junction box according to claim 1, wherein an upper end edge of the upright wiring board crosses an end of the upper wiring board. 3. A plurality of the upright wiring boards are stacked,
The electrical junction box according to claim 1, wherein an upper edge crosses an intermediate portion of the upper wiring board.