JPH08185905A - Electrical junction box - Google Patents

Abstract

PURPOSE: To form the internal circuit of an electrical junction box capable of easily coping with a design change. CONSTITUTION: This junction box has a power circuit 1 where a large amount of current flows, a load circuit 4 where a small amount of current flows, and a fuse 12 and/or a relay laid between the circuits 1 and 4. All of the circuits 1 and 4 are formed out of single wires 2 and 5 with single lines of conductors 2b and 5b, and crimp terminals 3 and 6 to break open the insulating covers 2a and 5a of the wires 2 and 5 for pressure contact with the conductors 2b and 5b. The conductor 2b of the power circuit wire 2 has a large diameter, and the conductor 5b of the load circuit wire 5 has a small diameter.

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 for an automobile, and more specifically, it centrally arranges electric circuits including a large number of relays, fuses, etc. to rationally perform branch connection of a wire harness. In the electrical junction box, the internal circuit is composed of an electric wire and a pressure contact terminal that press-contacts with the electric wire.

[0002]

2. Description of the Related Art Conventionally, in this type of electric junction box, a bus bar formed by punching out a conductive metal plate is used as its internal circuit. However, if the internal circuit is configured with only the bus bar, it is not possible to easily cope with the design change of the internal circuit. Therefore, a circuit including an electric wire and a pressure contact terminal pressure-connected to the electric wire is used as a load which is likely to cause a design change. It has been proposed to use it for a side circuit and use a bus bar for a power supply side circuit. (Actual Kaihei 1-166419, Actual Kaihei 2-1368989)

[0003]

When the power supply side circuit is constituted by the bus bar and the load side circuit is constituted by the electric wire and the pressure contact terminal as described above, two circuits having different configurations are electrically connected to each other. Since it has to be installed inside the box,
There is a problem that the internal structure of the electric junction box becomes complicated, many kinds of components are required, and the mounting mode is different, so that the number of working steps is increased.

Further, both a punching die for forming the bus bar and a wiring die for laying the electric wires are required, and there is a problem that the cost is significantly increased. Furthermore, when the power supply circuit is also used for other vehicle types, it is often necessary to change the power supply circuit. In that case, it is necessary to re-form the bus bar. Therefore, even if only the load side circuit is composed of the electric wire and the pressure contact terminal, the problem that occurs when the circuit is composed of the conventional bus bar cannot be solved.

The present invention has been made in view of the above-mentioned conventional problems, and a power supply circuit is also composed of an electric wire and a pressure contact terminal,
The internal circuit of the electric junction box is composed entirely of electric wires and pressure contact terminals, and in the internal circuit of the structure, the electric wires and the energizing amount can be matched, that is, even in the power supply circuit in which a large current flows, It is an object of the present invention to provide an electric junction box capable of passing a large current in a circuit composed of a pressure contact terminal.

[0006]

To achieve the above object, the present invention provides a power supply circuit in which a large current flows, a load side circuit in which a small current flows, and the power supply circuit and the load side circuit in claim 1. In an electrical junction box provided with a fuse and / or a relay interposed therebetween, all of the power supply circuit and the load side circuit are provided with a single electric wire having a single core wire, and insulation of the single electric wire. There is provided an electric connection box characterized by comprising a pressure contact terminal which is pierced through a coating and pressure-contacted with a single core wire.

The single electric wire of the power supply circuit has a large core wire diameter, and the single electric wire of the load side circuit has a small core wire diameter (claim 2). That is, a thick single wire having a core wire cross-sectional area of 1.25 mm ² or more is used as an electric wire for a power supply circuit, while a core wire cross-sectional area of 1.25 is used as an electric wire for a load side circuit.
A single line of a fine object less than mm ² is used.

[0008]

According to the first aspect of the present invention, the internal circuit of the electric junction box is entirely composed of electric wires and press-contact terminals for press-contacting the electric wires.
If all of these wires are composed of a single wire with a single core wire, when the pressure contact terminal is pressed into contact with the wire, the pressure contact terminal is connected to the core wire of the single wire, so that the contact area can be reliably kept constant and the pressure contact It does not cause a problem that the amount of electricity is reduced and the resistance value is increased in the connection portion. Generally, an electric wire that carries a large current is an electric wire provided with a core wire made of a stranded wire, but this stranded wire has a problem that the contact area cannot be kept constant during press contact with a press contact terminal. In the present invention, since the core wire is a single wire, the contact area can be kept constant as described above, and there is no problem even if a large current is applied.

Further, as described in claim 2, when a single electric wire having a large core wire diameter is used as the electric wire of the power supply circuit, a large current can flow through the electric wire, and the electric wire and the energization amount Can be matched. Similarly, since a single electric wire having a small core wire diameter is used for the load side circuit through which a small current flows, it is possible to make the electric current amount of the electric wire an appropriate value also on the load side.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of an electric junction box according to the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view of an electric connection box. A power supply circuit 1 includes a thick electric wire 2 having a core wire formed of a large diameter single wire and a pressure contact terminal 3 for press-contacting the thick electric wire 2.
The load side circuit 4 is composed of a fine electric wire 5 having a core wire formed of a single wire having a small diameter, and a pressure contact terminal 6 press-contacting the fine electric wire 5.

The thick electric wire 2 of the power supply circuit 1 is inserted into the wide wiring groove 8 formed on the upper surface of the insulating plate 7 for wiring, while the thin electric wire 5 of the load side circuit 4 is connected to the insulating plate 7. Wiring is performed by inserting into a narrow wiring groove (not shown) formed on the lower surface. The thick electric wire 2 and the thin electric wire 5 are laid in advance in a wiring die (not shown), transferred from the wiring die to the insulating plate 7, and the thick electric wire 2 And the thin electric wires 5 are laid at once.

After the thick electric wire 2 and the thin electric wire 5 are laid in the wiring grooves of the insulating plate 7, the pressure contact terminals 3 and 6 are driven into the required places, as shown in FIGS. 2 (A) and 2 (B). And each wire 2,
The insulating coatings 2a, 5a of 5 are pierced by the slot portions 3a, 6a of the press contact terminals 3, 6, and the end surfaces of the blade portions 3b, 6b formed on the inner peripheral surfaces of the slot portions 3a, 6a and the single wire of the electric wires 2, 5 Are in contact with the core wires 2b and 5b.

As shown in FIG. 2 (A), the diameter of the single core wire 2a of the thick electric wire 2 is large, and its cross-sectional area is equal to or larger than 1.25 mm ^2. In contrast to this, FIG. 2 (B) The diameter of the single core wire of the fine electric wire 5 shown in Fig. 2 is small, and its cross-sectional area is 1.2.
It is less than 5 mm ² . Therefore, the press-contact terminals 3 and 6 that press-connect are made to correspond to increase the slot width W1 of the press-contact terminal 3 that press-contacts the thick electric wire 2 and decrease the slot width W2 of the press-contact terminal 6 that press-contacts the thin electric wire 5. In each case, the press contact blade portions 3b and 6b are surely brought into contact with the core wires 2b and 5b in a constant area.

As described above, all of the power supply circuit 1 and the load side circuit 4 in the electric connection box are composed of the electric wires 2 and 5 and the pressure contact terminals 3 and 6 which are pressed against the electric wires 2 and 5. .

Next, the relay terminal 9 is connected to the input / output terminal portions 3c and 6c extending in the direction opposite to the wire pressure contact side of the pressure contact terminals 3 and 6, if necessary. After that, upper case 1
0 and the terminal holes 10a, 11 formed in the lower case 11
With the input / output terminal portions 3c and 6c protruding from a, they are assembled from both sides with the upper case 10, the lower case 11 and the insulating plate 7 sandwiched therebetween.

The upper case 10 and the lower case 11 are assembled with fuses 12 and connectors (not shown) such as post-installed parts, and the connectors are connected to the input / output terminal portion 3 described above.
Projections c and 6c are connected to the external terminals, and the terminals of the fuse 12 are inserted into the relay terminals 9 and connected to the pressure contact terminals.

The manner of arranging the electric wires constituting all the internal circuits of the electric junction box and the manner of press contact between the electric wires and the press contact terminals are not limited to the above-mentioned embodiment, and for example, along the inner surfaces of the upper case and the lower case. You may wire it.

[0018]

As is apparent from the above description, in the electric connection box according to the present invention of claim 1, all of the internal circuits including the power supply circuit and the load side circuit are composed of electric wires and pressure contact terminals. Therefore, it is possible to easily deal with a design change. Further, since the bus bar is not used at all, the bus bar punching die is not required, the cost can be reduced, and it can be easily shared with other vehicle models. Further, as compared with the case where the circuit is used in combination with the bus bar, the circuit can be attached to the electric junction box in one type, so that the attaching process is simplified and the number of parts can be reduced.

Further, since the single electric wire having the single core wire is used as the electric wire, the connection with the press contact terminal can be surely performed.

Further, according to the second aspect, since the large-diameter core wire is used as the electric wire of the large current circuit, the electric current flowing through the electric wire can be set to an appropriate current value. Similarly, since a small-diameter core wire is used as the electric wire of the load side circuit, the electric wire and the current value can be matched even in the load side circuit through which a small current flows.

[Brief description of drawings]

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

FIG. 2A is a sectional view showing an electric wire and a pressure contact terminal of a power supply circuit, and FIG. 2B is a sectional view showing an electric wire and a pressure contact terminal of a load side circuit.

[Explanation of symbols]

 1 Power supply circuit 2 Thick electric wire 3,6 Pressure contact terminal 4 Load side circuit 5 Fine electric wire 7 Insulation plate 10 Upper case 11 Lower case 12 Fuse

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yuji Saka 1-14 Nishisuehiro-cho, Yokkaichi-shi, Mie Sumitomo Wiring Systems Co., Ltd. (72) Masami Kobayashi 1-1-14 Nishisuehiro-cho, Yokkaichi-shi, Mie Sumitomo Denso Co., Ltd.

Claims (2)

[Claims] 1. An electric junction box comprising a power supply circuit through which a large current flows, a load side circuit through which a small current flows, and a fuse and / or a relay interposed between the power supply circuit and the load side circuit, wherein All of the circuit and the load side circuit are composed of a single electric wire whose core wire is a single wire, and an insulation displacement terminal for connecting the single electric wire by piercing its insulating coating and making pressure contact with the core wire of the single wire. An electrical junction box characterized by 2. The electric junction box according to claim 1, wherein the single electric wire of the power supply circuit has a large core wire diameter and the single electric wire of the load side circuit has a small core wire diameter.