JP2547821B2 - Electrical junction box - Google Patents

Description

TECHNICAL FIELD The present invention relates to an electric junction box used for wiring of an automobile.

[Conventional technology]

A conventional electric connection box is provided with a large number of fuses and relays collectively, and uses a bus bar for the configuration of an internal circuit in order to absorb a joint part of a wire harness.

FIG. 7 shows an example thereof, in which the main board 1 and the under cover 2 accommodate wiring board assemblies a, b ... Insulating board 3 and a plurality of bus bars 4. Then, the tab terminal 5 standingly coupled to the bus bar 4 is passed through the tab hole 6 of the insulating plate 3,
By inserting one end of a relay terminal 8 provided with female terminal portions 7 at both ends, the relay terminal 8 and the tab terminal 5 are projected into the connector insertion portion 9, the fuse cavity 10 and the like provided on both covers,
The terminal connector 9'of the wire harness W, the fuse 11 and the like can be connected. 12 is a relay and 13 is a circuit breaker.

[Problems to be Solved by the Invention]

As described above, the conventional electrical junction box uses the bus bar 4 for the construction of the internal circuit. However, the arrangement of the tab terminals 5 and the tab holes 6 in each layer of the insulating plate penetrate the circuit and the assembly of the circuit is complicated. However, even if a change such as the deletion of a part of the circuit is handled by cutting the bus bar 4, a new mold is required to add the circuit, and a drastic circuit change is impossible.
Therefore, each bus bar is manufactured as a dedicated part that has a specific circuit pattern for each vehicle model and grade that uses an electrical connection box, and it is difficult to divert and generalize it. Had to be redone, which was a factor in increasing costs.

An object of the present invention is to solve the above problems and to provide an electrical connection box that can be quickly dealt with without requiring a large change in the circuit even if the vehicle type or grade changes, and is low cost and has general versatility. To provide.

[Means for solving the problem]

In order to achieve the above-mentioned subject, in the present invention,
In an electric connection box having a plurality of internal circuits in which fuses are respectively inserted in the lower cover, the fuse of the common internal circuit that does not need to be changed in circuit configuration depending on the vehicle type or grade in which the electric connection box is used. The power supply side or load side circuit is formed by a bus bar provided with a tab terminal for connection, the bus bar is arranged on an insulating plate, and an internal circuit that needs to be changed is formed by the internal wiring of the electric wire and the internal wiring of the electric wire. By connecting the terminals installed on the upper / lower covers to each other or between the terminals installed on the upper / lower covers and the tab terminals, and arranging the terminals between the upper / lower covers and the insulating plate. , The insulating plate provided with the bus bar and the internal wiring of the electric wire are separately housed in the upper and lower covers, and the tab terminals of the bus bar are arranged at predetermined positions of the upper and lower covers. thing And it features.

The above configuration will be specifically described with reference to the wiring diagram of the electric connection box of FIG. 1. A is an electric connection box, 4 is an internal circuit formed by the arrangement of bus bars, and 14 is an internal wiring of electric wires. The internal circuit is shown. The bus bar 4 does not change the circuit configuration even if the vehicle type or grade changes, and it is commonly used in various electrical junction boxes and is fixedly arranged in the circuit part that does not need to be changed. The electric wire 14 increases, decreases, or is abolished depending on the vehicle type and grade. It is used for the circuit parts that need to be changed. The bus bar 4 and the electric wire 14 are used regardless of the power source side E and the load side L of the fuse 11.

In the figure, J indicates a joint coupling part of the electric wire, and the subscripts a ₀ , a ₁ , a ₂ ..., B ₀ , b ₁ , b ₂ ..., c ₀ , c ₁ , c ₂ ..., d ₀ , d ₁ , d ₂ ... Represent terminals, and tab terminals or pressure contact terminals coupled to busbars can be suitably used for these terminals, as will be described later.

Here, when the internal circuits 4 and 14 are defined by using the above subscripts, the circuit a ₀ a ₂ -a ₃ a ₈ with the fuse 11 interposed is a cigarette lighter circuit and is independent of the vehicle type. It is advantageous to form the entire bus bar 4 because it is used, no circuit modification is required, and a considerable amount of current flows.

On the other hand, circuits a ₄ a ₅ and a ₄ a ₆ connected to busbar circuit a ₀ a ₁
And a ₄ a ₇ are circuits for radio, audio and power antennas, respectively, which belong to so-called optional circuits,
Some of them are not used (dotted line portions) depending on the vehicle type, etc. Therefore, if the whole is formed in advance with bus bars, some of them are cut and removed, and an empty circuit occurs.

Also, the circuits b ₂ b ₃ and b ₂ b ₄ connected to the wire circuit b ₀ b ₁
In the case of an air conditioner circuit that is not equipped with an air conditioner, it is not necessary to wire the electric wire 14 on either the power source side E or the load side L of the fuse 11. If this entire air conditioner circuit is previously formed with bus bars, it is completely wasted and the cost is increased.

[Work]

As is clear from FIG. 1, the number of circuits (a ₄ a ₅ , a ₄ a ₆ ...) changed depending on the vehicle type and grade can be freely changed by increasing or decreasing the number of pressure contact terminals connected to the electric wire 14, for example. Therefore, the joint absorption capacity is large and the circuit can be easily changed.

Further, the internal circuit 4 (a ₀ a ₁ , a ₀ a ₂ ...) Composed of busbars having a relatively complicated pattern can be used as a common circuit that does not change depending on the vehicle model or grade, and can be used for punching busbars. Very few molds are needed.

Further, the change of the internal circuit 14 formed by the electric wire does not have any influence on the internal circuit 4 formed by the bus bar in terms of the above-mentioned pattern, terminal arrangement, etc. Therefore, it is local when viewed from the whole circuit. The change is sufficient, and the trouble of re-designing the circuit and manufacturing the mold as before is eliminated.

Moreover, for the air conditioner circuits (b ₀ b ₁ , b ₂ b ₃ ...) That do not require equipment, wiring can be omitted from the beginning, and there are no unnecessary empty circuits or empty terminals.

As described above, a significant cost reduction is expected by the rationalization of the assembly and manufacturing process of the internal circuit that constitutes the electrical junction box.

〔Example〕

Hereinafter, the same components as those of the related art will be described using the same reference numerals.

2 and 3, the insulating plate 3 of the wiring board a is provided with a plurality of bus bars 4 as a common circuit that does not change depending on the vehicle type or grade. These bus bars 4 have a tab terminal 5a for connecting a battery power circuit (not shown), a tab terminal 5b for connecting a fuse, or a tab terminal 5c for connecting a load.

The fuse cavity 10 of the main cover 1 is provided with a plurality of pairs of terminal holes 10a and 10b. The tab terminals 5b extend through the terminal holes 10a and 10b, or the fuse-side pressure contact terminals 15 to which the electric wires 14 are pressure contact connected are fixed. The fuse side pressure contact terminal 15 has a male terminal on one end.
15a and a slot 15b for press-fitting an electric wire at the other end, and a relay terminal 8 is used to connect the pair of terminals 11a and 11b of the fuse 11 to the tab terminal 5b and the pressure contact terminal 15, respectively.

The under cover 2 also has a large number of terminal holes 2a, and a load side pressure contact terminal 15 'or a power supply side pressure contact terminal 15 "having the same structure as the fuse side pressure contact terminal 15 is press-fitted and fixed in each hole 2a. IDC 15,15 'and 15 "slots 15b
The internal circuit 14 (FIG. 1) formed by the electric wires is formed by press-fitting and fixing the ends of the electric wires 14, respectively.

₁ , ₂ and ₃ load side press contact terminals 15 'are connected to the electric wires shown by reference numerals 14 ₁ , 14 ₂ and 14 ₃ , respectively.

Thus, the number of joints can be changed at will,
Circuit changes are very easy.

In the embodiment shown in FIG. 4, the fuse side pressure contact terminal 15 is directly press-fitted and fixed in the terminal hole 3a provided in the insulating plate 3. In this case, during the assembly process of the wiring board assembly a,
On the same line, the tab terminal 5b and the fuse side pressure contact terminal
The relay terminal 8 can be attached to 15.

In the embodiment shown in FIG. 5, the fuse side pressure contact terminal 16 is fixed to the press fit hole 2a provided in the under cover 2. As shown in FIG. 6, this press-contact terminal 16 is formed by forming a male terminal portion 16a on the upper side, a press-fitting piece 16b on the lower side, and projecting a press-contacting piece 16c having a slot 16d on the press-fitting piece 16b side. In this case, the electric wires 14 for branch connection can be wired in one layer in the under cover 2.

In the above, the example in which the pressure contact terminal is used for forming the internal circuit by the electric wire 14 has been described, but it goes without saying that a means such as caulking or soldering may be used for connection with the terminal.

〔The invention's effect〕

As described above, in the electrical junction box of the present invention, the internal circuit, which is changed depending on the vehicle type, grade, etc., is formed by the electric wire, so that the circuit can be changed quickly and easily. At the same time, the simplification of the circuit configuration of the bus bar that forms a common circuit that does not need to be changed, the reduction of the product number, and the versatility will streamline the manufacturing process, and it is expected that the cost will be significantly reduced.

[Brief description of drawings]

FIG. 1 is a wiring diagram of an internal circuit showing an embodiment of the electric junction box of the present invention, FIG. 2 is an exploded perspective view of an electric junction box having the same internal circuit, and FIG. And FIG. 4 and FIG. 5 are cross-sectional views of the main part in a state just before assembly showing another embodiment of the present invention, and FIG. 6 is an enlarged perspective view of the fuse side pressure contact terminal of FIG. FIG. 7 is an exploded perspective view of a conventional electric junction box. A ... Electric junction box, 1 ... Main cover, 2 ... Under cover, 3 ... Insulation plate, 4 ... Bus bar (internal circuit), 5,5a-5c ... Tab terminals, 8 ... Relay terminals, Ten……
Fuse cavity, 11 …… Fuse, 14 …… Wire (internal circuit), 15,16 …… Fuse side pressure contact terminal, 15 ′ …… Load side pressure contact terminal, 15 ″ …… Power supply side pressure contact terminal.

Front Page Continuation (72) Inventor Yuichi Ishida 252 Kawashimada Gotemba, Shizuoka Prefecture Yazaki Parts Co., Ltd. (56) References JP 62-12321 (JP, A) JP 55-101011 (JP, A) Actual Development Sho 55-140271 (JP, U)

Claims (1)

(57) [Claims] 1. An electric junction box having a plurality of internal circuits in which fuses are respectively provided in the upper and lower covers, and a common circuit configuration does not need to be changed depending on the vehicle type, grade, etc. in which the electric junction box is used. The power supply side or load side circuit of the fuse of the internal circuit of is formed by a bus bar provided with a tab terminal for connection, the bus bar is arranged on an insulating plate, and the internal circuit that needs to be changed is formed by the internal wiring of the power supply. In addition, the internal wiring of the electric wire is connected between the terminals installed on the upper and lower covers or between the terminals installed on the upper and lower covers and the tab terminal to connect the upper and lower covers and the insulating plate. By disposing the bus bar between the insulating plate and the internal wiring of the electric wire, the tab terminal of the bus bar is separated from the insulating plate in which the bus bar is arranged and housed in the upper / lower cover. Place Electrical connection box, characterized in that the the like.