JP3155705B2 - Electrical junction box - 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 junction box mounted on an automobile and distributing electric power to electric equipment of the automobile.

[0002]

2. Description of the Related Art FIG. 4 is an exploded perspective view of a conventionally used electric connection box. The connection box main body 1 has a mounting portion 3 on the upper surface on which electric components such as fuses and relays are mounted.
An under cover 2 is attached to the lower surface of the main body 1, and a branch circuit is built in between them. The branch circuit includes a plurality of bus bars 4 arranged in a plurality of stages,
The bus bar 4 is formed by a plurality of insulating plates 5 interposed therebetween to insulate the bus bars 4 from each other. Each of the bus bars 4 distributes a predetermined current, and is formed by a plate-shaped conductor into a shape that forms a circuit alone. The insulating plate 5 is provided so that the individual circuits do not cross each other, and is therefore inserted between the bus bars 4.

[0003] The bus bar 4 in such a conventional electric junction box is formed so as to be entirely flat except that the terminal portion 6 which needs to be connected to the electric component stands. The thickness and width of the bus bar 4 are set so as to have a cross-sectional area corresponding to the current to be distributed. Therefore, the bus bar 4 connected to the fuse is formed to be thick or wide.

[0004]

In the conventional electric junction box, it is necessary to arrange the bus bars 4 as independent circuits so that they do not cross each other.
Are arranged in a stacked state in a plurality of stages via the same. Therefore, as the number of bus bars 4 increases, the number of insulating plates 5 also increases, which causes a problem that the electric junction box itself becomes thicker and larger and larger. Further, since the bus bar connected to the fuse is formed to be thick or wide, a large space for arranging the bus bar is required, which limits the miniaturization.

The present invention has been made in view of such circumstances, and the number of insulating plates arranged between bus bars can be reduced, the weight and thickness can be reduced, and the electrical connection can be reduced in size. The purpose is to provide boxes.

[0006]

According to a first aspect of the present invention, there is provided an electric junction box having a built-in branch circuit formed of a bus bar made of a plate-like conductor, and an electric part such as a fuse or a relay.
Connection box body with mounting part on the top side for mounting products
And the underside attached to the lower side of this junction box body
The branch circuit is disposed between the cover and the cover, and the branch circuit includes a plurality of planar busbars stacked with an insulating plate interposed therebetween, and a lowermost layer of the stacked planar busbars and the insulating plate. It erected a height of the top layer from the previous
The outer cover is provided on an outer peripheral side of the under cover, and
A terminal part that is arranged in the
And an upright busbar used as an upstream terminal portion of the fuse .

The upright busbar constitutes a part of the branch circuit. By forming the branch circuit with the planar busbar and the upright busbar in this way, the number of planar busbars is reduced, and The number of insulating plates inserted between the bus bars is reduced. In addition, since the upright busbar is arranged on the outer peripheral side of the undercover, heat generated from the upright busbar can be easily released to the outside, and heat dissipation is improved. Furthermore, since the upstream terminal portion of the fuse is formed with respect to the upright busbar, the busbar on the plane does not need to have a large cross-sectional area, and the thickness and the space can be reduced accordingly.

[0008]

[0009]

[0010]

[0011]

According to a second aspect of the present invention, in the first aspect, a wall portion for holding the upright bus bar is formed in the under cover.

The wall portion provides insulation between the upright busbar and the planar busbar. Therefore, an insulating plate for insulating the upright busbar and the planar busbar is not required therebetween.

[0014]

1 to 3 show an embodiment of the present invention. FIG. 1 is an exploded perspective view, FIG. 2 is a sectional view of a supporting portion of an upright bus bar, and FIG. 3 is a connection of an upright bus bar. It is a perspective view of a structure. As shown in FIG. 1, the electric connection box of this embodiment includes a connection box main body 10 and an under cover 11 attached to the lower surface side of the connection box main body 10, and includes a bus bar and an insulating plate described later therebetween. A branch circuit is built in. Connection box body 10 and under cover 11
Are molded with insulating resin.
On the upper surface side of the connection box body 10, mounting portions 12, 13 for mounting electric components are integrally formed. Among them, 12 is a fuse mounting portion for mounting a fuse,
Reference numeral 13 denotes a relay mounting section for mounting a relay.
Further, a wall portion 14 is integrally formed inside the under cover 11. The wall portion 14 is formed on an outer peripheral portion on one side of the under cover 11, and supports an upright bus bar 18 as described later.

The branch circuits are planar bus bars 15, 16;
It is constituted by an insulating plate 17 and an upright bus bar 18. The planar busbars 15, 16 and the upright busbars 18 distribute electric current, are formed by plate-shaped conductors, and independently form circuits. In this case, terminal portions 15a and 16a for connecting to the electrical components are formed in required portions on the planar bus bars 15 and 16 by being bent upright.

The planar bus bars 15, 16 are arranged in a stacked state. The insulating plate 17 is provided with these planar bus bars 15,
The insertion of the bus bars 15 and 16 prevents the circuits from intersecting each other. In addition, a terminal hole 17a through which the terminal portions 15a and 16a of the planar bus bars 15 and 16 pass is formed at a predetermined portion of the insulating plate 17. Reference numeral 17b denotes a terminal hole formed in the insulating plate 17 so that the terminal portion 18a of the upright bus bar 18 penetrates.

The upright busbar 18 is used for the undercover 11.
Is placed on top. The upright busbar 18 has terminals 18a and 20 and stands up from the undercover 11 in the direction of the junction box main body 10. Its height is the highest in the stacked body of the planar busbars 15, 16 and the insulating plate 17. It is from the lower layer to the uppermost layer. As a result, the upper end of the upright bus bar 18 reaches the inside of the connection box main body 10, and its terminal portions 18a and 20 are connected to the electric components.
Current distribution can be performed. In this case, the upright busbar 18 can be adjusted so as to perform optimal distribution by using a thickness, a width, and a material corresponding to the current value.

In the form in which the branch buses are formed by combining the upright busbars 18 with the upright busbars 15 and 16 as described above, the number of planar busbars can be reduced, the number of stacked busbars is reduced, and the required insulating plate is reduced. Is also reduced. Therefore, not only can the thickness of the electric junction box be reduced, but also the weight and size can be reduced.

In this embodiment, the upright bus bar 18 is attached to the outer peripheral portion on one side of the under cover 11. Thus, the upright busbar 18 is located on the outer peripheral side of the undercover 11, and even if heat is generated, the heat can be radiated smoothly. For this reason, the heat radiating property of the heat from the upright bus bar 18 is improved, and the design of the heat radiating measure is facilitated.

As shown in FIG. 2, the upright busbar 18 is supported by integrally forming a wall 14 on the outer peripheral side of the undercover 11, and between the wall 14 and the outer peripheral wall 14 of the undercover. This is performed by inserting the upright bus bar 18 into the bus bar. Thus, the upright busbar 18 is supported upright without falling down. In such a support state, the wall portion 14 is made up of the planar bus bars 15 and 16 and the upright bus bars 18.
Prevents contact with Therefore, the insulation between the upright busbar 18 and the planar busbars 15 and 16 can be reliably ensured with a simple structure, and a reliable assembly can be achieved.

Here, a plurality of terminal portions 20 in the upright bus bar 18 are formed in a comb-like shape. The terminal portions 20 are formed so as to face the fuse mounting portions 12 of the connection box body 10, and each terminal portion 20 enters the corresponding fuse mounting portion 12 as shown in FIG. 3. By this approach, each terminal section 20 is connected to a fuse (not shown) in the mounting section 12. As a result, the terminal portion 20 becomes an upstream terminal portion of the fuse, and there is an advantage that it is not necessary to use a bus bar having a large sectional area.

Further, as shown in FIG. 3, a part of the upright busbar 18 may be formed as a fixing piece 21 and the bush 18 may be fixed using the fixing piece 21. That is, the fixing piece 21 can be pulled out of the connection box body 10 and fixed by inserting the bolt 22 of the connection box body 10. By pulling out a part of the upright bus bar 18 to the outside of the connection box main body 10 in this manner, the heat dissipation can be further improved.

In this embodiment, connection using the fixing piece 21 is possible. In FIG. 3, reference numeral 25 denotes an electric wire such as a wire harness, and a connection terminal 26 is attached to a tip portion thereof. The bolt 22 is inserted through the connection terminal 26, and the nut 27 is screwed into the bolt 22.
The fixing piece 21 is fixed by tightening the nut 27, and the fixing piece 21 and the connection terminal 26 come into contact with each other, so that the upright bus bar 18 and the electric wire 25 are connected.
Therefore, the fixing of the upright bus bar 18 and the connection between the upright bus bar 18 and the electric wire 25 can be performed simultaneously.

[0024]

According to the first aspect of the present invention, the number of bus bars on the plane is reduced by forming a branch circuit by the bus bars on the plane and the upright bus bars, and the number of insulating plates inserted between the bus bars on the plane is reduced. And the electric junction box can be made thinner, lighter and smaller. In addition, since the upright busbar is arranged on the outer peripheral side of the undercover,
The heat generated from the upright busbar can be easily released to the outside,
Heat dissipation is improved. Further, since the upstream terminal portion of the fuse is formed for the upright busbar, the busbar on the side surface does not need to have a large cross-sectional area, and the thickness and space can be reduced accordingly.

[0025]

[0026]

According to the second aspect of the present invention, the wall portion of the undercover insulates the upright busbar and the planar busbar, so that an insulating plate is not required therebetween.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of an electric junction box according to an embodiment of the present invention.

FIG. 2 is a sectional view of a support portion of the upright busbar.

FIG. 3 is a perspective view of a fixing and connecting structure of the upright busbar.

FIG. 4 is an exploded perspective view of a conventional electric junction box.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Connection box main body 11 Under cover 12 Fuse mounting part 14 Wall part 15 16 Planar bus bar 17 Insulating plate 18 Upright bus bar

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H02G 3/16 B60R 16/02 H01R 4/38

Claims (2)

(57) [Claims] 1. An electric connection box having a built-in branch circuit formed by a bus bar made of a plate-shaped conductor, wherein the branch circuit is stacked in a plurality of stages with an insulating plate interposed therebetween. When the upright bus bars standing upright with a height of up to the top layer, Tona is, electrical components such as fuses and relays are mounted from the bottom layer of the planar bus bars and insulation plates being these laminated Mounting part is up
Connection box body formed on the surface side and lower surface of this connection box body
Between the under cover and the under cover
A road is arranged, and the upright busbar is connected to the undercover.
On the outer peripheral side of the
Terminals connected to electrical components
Electrical connection box according to claim Rukoto used as the upstream-side terminal of the fuse. 2. The electrical junction box according to claim 1 , wherein a wall for holding the upright busbar is formed in the undercover.