JP2871471B2 - Connection structure of 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 a connection structure of an electric connection box, and more particularly, to a structure in which a relay box, a fusible link box, a fuse box and the like can be easily connected to a junction box mounted on an automobile. It is.

[0002]

2. Description of the Related Art Conventionally, a motor vehicle is equipped with a junction box which accommodates internal circuit members such as a bus bar and the like, mounts a relay, a fuse, etc., and centrally distributes power and branches and connects circuits. I have. Normally, as shown in FIG. 5, a fusible link box 2, relay boxes 3, 4 and the like are connected to a junction box 1.

[0003] The mutual electrical connection of the above-mentioned boxes (electric connection boxes) 1 to 4 is made by connecting terminals 5 to the terminals of the electric wire W as shown in the figure.
By crimping the connector or attaching the connector 6 to the terminal 5.
Is connected to the terminal of another box, or the connector 6 is fitted and connected to the connector accommodating portions formed in the boxes 1 to 4.

[0004]

As described above, the electric connection between the boxes 1 to 4 is made by the electric wire W, the terminal 5 and the connector 6.
When the connection is made by using the wire, the number of parts such as the electric wire W, the terminal 5 and the connector 6 increases, and the step of connecting the terminal 5 to the electric wire W, the step of attaching the connector 6 to the electric wire W, and connecting the terminal 5 to the terminal of the box And the number of working steps such as the step of connecting the connector 6 to the connector accommodating portion of the box increases the number of steps and the cost.

Further, the number of connection points increases due to the connection between the electric wire W and the terminal 5, the connector 6, the connection between the terminals 5, the connection between the connectors 6, and the like, so that the resistance increases. In particular, since a large current circuit is required in the power supply side circuit, the resistance at the connection portion becomes extremely large, and a thermal problem occurs. In addition, a thick electric wire must be used for the large current circuit, and there is a problem in that the thick electric wire has poor assembling workability. Furthermore, when the boxes 1 to 4 are connected by using the electric wires W, the electric wires to be wired outside the box take up space, and especially for thick electric wires, the wiring space becomes large. As a result, there is a problem that the size of the case accommodating the boxes 1 to 4 for interconnecting them becomes large.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problem, and provides a connection structure of an electric connection box in which boxes can be directly connected with one touch without using wires, terminals, or connectors. The purpose is to do so.

[0007]

In order to achieve the above object, according to the present invention, there is provided an electric connection box in which electric parts constituting a branch circuit of a wiring harness including a relay, a fuse and the like are mounted. An electrical connection structure,
A case is provided for accommodating a plurality of electric connection boxes inside from the upper opening, and at least one or more joint bus bars are erected from the inner bottom surface of the case. A part of a conductive material such as a bus bar constituting a connection terminal portion to be fitted with the joint bus bar is provided, and when each electric connection box is accommodated in the case, each connection terminal portion is fitted to the joint bus bar, There is provided a connection structure for an electric connection box, wherein conductive materials of the electric connection box are electrically connected to each other via the joint bus bar.

Further, in claim 2, the connection terminal portion is formed on a part of a bus bar provided inside the electric connection box, protrudes from the outer surface of the box of the electric connection box, and a slit is formed on the protruding portion. And the female connecting terminal portion is protected by a protective wall integrally formed on the outer surface of the box, while the joint bus bar erected from the inner bottom surface of the case has a vertical flat plate shape, and 2. The connection structure for an electric connection box according to claim 1, wherein when the electric connection box is pushed into the case, the slit of the female connection terminal portion is fitted and connected from the upper end of the joint bus bar. I have.

The electric bus according to claim 1 or 2, wherein the joint bus bar standing from the bottom of the case is provided at a partition position of a plurality of electric connection boxes housed in the case. Provides a connection structure for a junction box.

[0010] According to a fourth aspect of the present invention, the retaining bush is formed integrally with the case on both sides of the joint busbar, and the joint busbar is erected and held by the protective wall.
The present invention provides a connection structure for an electric junction box described in the section.

According to a fifth aspect of the present invention, each of the electric connection boxes is a joint box, a relay box, a fuse box, or the like, and an upper opening of a case for housing these electric connection boxes is
A connection structure for an electric connection box according to any one of the preceding claims, wherein the connection structure is closed by a cover.

[0012]

In the connection structure according to the first aspect, the connection terminal portions of each electric connection box are electrically connected to the joint bus bar of the case only by the operation of housing each electric connection box in the case.
Each electrical junction box can be electrically connected directly and with one touch.

In the connection structure of the present invention, since the connection terminal portion provided on the electric connection box protrudes to the outside, it can be easily and accurately fitted to the joint bus bar, and the protruding connection terminal portion is protected by the protective wall. Can be protected. In the connection structure of the third aspect, since the partition wall is formed by the joint bus bar, positioning of each electric connection box and connection with another electric connection box can be performed simultaneously. According to the connection structure of the fourth aspect, the joint bus bar standing upright from the bottom of the case can be held in the vertical direction, and can be smoothly fitted to the electric connection box. According to the connection structure of the fifth aspect, the joint box, the relay box, the fuse box and the like can be compactly accommodated in the case.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments. As shown in FIG. 4, a rectangular box-shaped lower case 10 is provided.
The junction box 12 and the relay boxes 13 to 15 are accommodated through the upper opening 10a.
Is covered by the upper case 11.

As shown in FIG. 1, three joint bus bars 16 necessary for electrically connecting the boxes 12 to 15 are provided on the inner bottom surface 10b of the lower case 10.
To 18 are erected. The joint bus bar 16
It is made of a conductive metal plate and has a shape obtained by bending a rectangular flat plate into a substantially U-shape. Joint busbars 17 and 18
This is a shape obtained by bending a rectangular flat plate into a substantially L shape. These joint busbars 16, 17, 18 are each provided in a rectangular frame shape at the positions shown in the figure, and are provided at positions separating the junction box 12 and the relay boxes 13 to 15 housed inside the lower case 10. As shown in FIGS. 2A and 3A, the upper ends of the joint busbars 16 to 18 are formed in a tapered shape.

As shown in detail in FIG. 3A, holding walls 10d,..., 10d having slits 10c into which the joint bus bars 16 to 18 can be pressed from above are provided on the inner bottom surface 10b of the lower case 10. The joint busbars 16-18 are press-fitted from above into the slits 10c of the holding walls 10d so that the joint busbars 16-18 are accurately held at predetermined standing positions. .

As shown in detail in FIGS. 2 and 3, connection terminals extending from a bus bar 19 constituting an internal circuit of each of the boxes 12 to 15 are provided on the outer bottom surfaces 12a to 15a of the boxes 12 to 15. Portions 19a are respectively provided so as to protrude.

The connection terminal portion 19a is connected to each box 12
To 15 from the inner bottom surface 12b to 15b to the outer bottom surface 12a to 15
a through the slit hole 20 leading to the outer bottom surfaces 12a-1
5a, and a bent portion 19c bent downward in a U-shape from a free end of the horizontal portion 19b, and a lower end is provided at the center in the width direction of the bent portion 19c. An insertion slit 19d cut upward from is formed at the lower end of the slit 19d.
Guide slopes 19e, 19e serving as guides for inserting the slit 19d from above into 18 are formed. As described above, the connection terminal portions 19 protruding from the boxes 12 to 15 are female connection terminal portions.

Outer bottom surface 12a of each box 12-15
Protective walls 1 around the connection terminal portions 19a to 15a for preventing the connection terminal portions 19a from being deformed by external force.
2c to 15c are respectively formed. Each protective wall 1
At the lower ends of 2c to 15c, the joint bus bar 16 is provided.
Guide slopes 12d to 15d serving as guides when inserting the connection terminal portion 19a from above are formed on the guide terminals.

In the case having the above structure, the joint bus bars 16 to 18 are held at predetermined standing positions on the inner bottom surface 10b of the lower case 10 by the holding walls 10d. When the junction box 12 is accommodated in the lower case 10 from the upper opening 10 a with respect to the lower case 10, the outer bottom surface 12 of the junction box 12 is formed.
a of the connection terminal portions 19a of the bus bar 16
6a and the portion 17a of the bus bar 17 are inserted and electrically connected.

Next, when the relay box 13 is accommodated in the lower case 10, the connection terminals 19a, 19a on the outer bottom surface 13a of the relay box 13 are inserted into the busbar 17 portion 17b and the busbar 18 portion 18a, thereby providing electrical connection. Connected to. When the relay box 14 is accommodated in the lower case 10, the connection terminal 19 a on the outer bottom surface 14 a of the relay box 14 is inserted into the portion 18 b of the bus bar 18 to be electrically connected. Further, when the relay box 15 is housed inside the lower case 10, the connection terminal 1 on the outer bottom surface 15 a of the relay box 15 is formed.
9a is inserted into the portion 16b of the bus bar 16 to be electrically connected.

As described above, by connecting the boxes 12 to 15 to the lower case 10, the connection terminals 19a of the boxes 12 to 15 can be electrically connected to the joint bus bars 16 to 18 of the lower case 10. . That is, each of the boxes 12 to 15 can be electrically connected directly and with one touch, thereby improving workability.

[0023]

As is apparent from the above description, according to the connection structure of the electric connection box of the present invention, the operation of accommodating each electric connection box in the lower case causes the joint bus bar of the lower case to connect each electric connection box to the lower case. The connection terminals can be electrically connected. Therefore, wires, terminals, and connectors, which were conventionally required for connection, are not required, and each electrical connection box can be electrically connected with one touch. Therefore, the number of parts and work steps can be largely omitted, and workability is improved, so that significant cost reduction can be achieved. Further, since the boxes are directly connected to each other without an electric wire or the like, the size of the case accommodating each box is reduced. Furthermore, since each connection terminal of each electric connection box is directly connected to the joint busbar of the lower case, the number of connection parts is reduced and the resistance is reduced. Particularly, when a large current such as a power supply circuit is conducted, the resistance is reduced. This makes it possible to reduce heat generation in the section.

On the other hand, when the joint bus bar of the lower case is held by the holding wall, the joint bus bar can be accurately held at the standing position. In addition, when the connection terminal portion of the electric connection box is protected by a protective wall, deformation of the connection portion due to external force can be prevented. In addition, the electrical junction box is a joint box,
In the case of a relay box, a fuse box, or the like, these boxes can be compactly accommodated in a case.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a connection structure of an electric connection box according to the present invention before connection.

FIG. 2A is a perspective view of a joint bus bar and a connection terminal portion before connection, and FIG. 2B is a side cross-sectional view of the connection terminal portion.

FIG. 3A is a front view before connection of a joint bus bar and a connection terminal portion, and FIG. 3B is a front view after connection of FIG.

FIG. 4 is a perspective view of a lower case and an upper case accommodating each box.

FIG. 5 is a perspective view of a connection structure of a conventional electric connection box.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Lower case 10a Upper opening 10b Inner bottom surface 10c Slit 10d Holding wall 11 Upper case 12 Junction box 13-14 Relay box 12a-15a Outer bottom surface 12c-15c Protective wall 16-18 Joint bus bar 19 Bus bar 19a Connection terminal part

Claims (5)

(57) [Claims] 1. A structure for electrically connecting electrical junction boxes having electrical components constituting a branch circuit of a wire harness including a relay, a fuse, and the like, wherein a plurality of electrical junction boxes are inserted from an upper opening into the interior. A case for housing is provided, and at least one or more joint busbars are erected from the inner bottom surface of the case. On the other hand, a part of a conductive material such as a busbar constituting an internal circuit is provided in each electric connection box housed in the case. Is provided with a connection terminal portion to be fitted to the joint bus bar, and when each electric connection box is accommodated in the case, each connection terminal portion is fitted to the joint bus bar, and the electric connection box is electrically connected via the joint bus bar. A connection structure for an electric connection box, wherein members are electrically connected to each other. 2. The connection terminal section is formed on a part of a bus bar provided inside the electric connection box, protrudes from the outer surface of the box of the electric connection box, and a slit is formed on the protruding portion to form a female connection. The terminal portion, and the female connection terminal portion is protected by a protective wall integrally formed on the outer surface of the box, while the joint bus bar erected from the inner bottom surface of the case has a vertical flat plate shape, and the electric connection box is formed from above by the case. The connection structure for an electric connection box according to claim 1, wherein a slit of the female connection terminal portion is fitted and connected to an upper end of the joint bus bar when the female connection terminal is pushed into the inside. 3. The joint bus bar standing upright from a bottom surface of the case is provided at a partition position of a plurality of electric connection boxes housed in the case.
Connection structure of the electrical junction box described in the above. 4. The connection structure for an electrical junction box according to claim 1, wherein holding walls are integrally formed on both sides of the joint bus bar with the case, and the joint bus bar is erected and held by the protection wall. . 5. The electric connection box according to claim 1, wherein the electric connection box is a joint box, a relay box, a fuse box, or the like, and an upper opening of a case for accommodating the electric connection box is closed by a cover. 2. The connection structure for an electrical junction box according to claim 1.