JP2002315153A - Connection structure between junction box and wiring harness - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify electrical connections between wires of a wiring harness and fuses or/and relays to avoid a multilayer structure of an internal circuit. SOLUTION: Some of a group of wires of a wiring harness W/H are inserted into a case of a junction box 10 and wires 16 among a group of wires inserted into the case which are to be branched and connected to the other circuits are connected with other conductors 14 arranged in the case. On the other hand, ends of wires 17, which are to be connected with only fuses or/and relays attached to fuse housings 11a or/and relay housings 11b, are connected with terminals 18 which are directly coupled with the fuse housings 11a or/and the relay housings 11b to connect the wires 17 with fuses or/and relays.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection structure between a junction box for a motor vehicle and a wire harness.
For details, see the wire harness wire and fuse or /
And the electrical connection between the relay and the relay.

[0002]

2. Description of the Related Art In recent years, with the rapid increase of electrical components mounted on automobiles, the number of circuits accommodated in a junction box has rapidly increased.
The number of parts has become very large, and the number of assembling steps has also become very large. Therefore, a junction box 1 as shown in FIG. 10 is proposed in Japanese Patent Application Laid-Open No. 7-95715.

[0003] A wire harness 4 having a connector 5 at the tip is taken into the junction box 1.
The electric wire (branch electric wire) of the wire harness 4 and the main electric wire are cross-connected at the branch connection sheet 3, the main electric wire is connected to the bus bar 2, and the bus bar 2 is connected to the fuse cavity 6 or the relay cavity 7 by a fuse or a fuse. It is configured to be connected to a relay. The junction box 1 can reduce the number of assembling steps and can easily cope with circuit changes.

[0004]

However, in the junction box 1, all the wires of the wire harness 4 are taken into the branch connection sheet 3, and when the wires of the wire harness 4 are electrically connected to a fuse or / and a relay. Are connected via the branch connection sheet 3 and the bus bar 2 irrespective of the necessity of branch connection with other circuits. In this case, a part of the circuit of the branch connection sheet 3 and the bus bar 2 occupies a part of the circuit that does not necessarily require the use of the branch connection sheet 3 and the bus bar 2, and the internal circuit is multi-layered and complicated. There is a problem.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to simplify an electrical connection between a wire of a wire harness and a fuse or / and a relay to prevent an internal circuit from being multi-layered. And

[0006]

In order to solve the above-mentioned problems, the present invention inserts a part of a wire group of a wire harness into a case of a junction box and communicates with another circuit in the inserted wire group. The wires that need to be branched and connected are connected to the other conductive material disposed inside the case, and only to the fuses and / or relays attached to the fuse housings and / or relay housings provided in the case. The junction box is characterized in that terminals to be connected to these wire terminals are directly arranged in the fuse accommodating section or / and the relay accommodating section and connected to the fuse or / and the relay. A wire harness connection structure is provided.

[0007] As described above, in the wire group of the wire harness, wires that need to be branched and connected to other circuits are distinguished from wires that do not need to be branch connected, and fuses and / or wires are not connected without branch connection. By attaching a terminal to the end of the electric wire (so-called through circuit electric wire) that is connected only to the relay, and arranging the terminal directly in the fuse accommodating section and / or the relay accommodating section, the circuit connected to the conductive material is reduced. Therefore, it is possible to suppress the multilayering of the internal circuit, and also to reduce the materials such as the conductive material and the branch connection work.

Further, by providing a terminal at the end of a freely movable wire and directly arranging the terminal in the fuse accommodating section and / or the relay accommodating section, the fuse accommodating section and / or the relay accommodating section are provided. It is possible to freely design and change the circuit without being restricted by the position in the above case. That is, in the circuit formed by the conventional bus bar, the tab is accommodated in the fuse accommodating portion or / and the relay accommodating portion fixedly provided in the case by changing the position of the tab of the bus bar by changing the circuit. Although the case cannot be changed and the case must be changed, the present invention allows the circuit to be changed flexibly and reduces restrictions in circuit design.

The electric wire connected only to the fuse and / or the relay may be an intermediate splice with the electric wire branched and connected to the conductive material. As described above, even when the electric wire connected only to the fuse and / or the relay is provided in the form of an intermediate splice on the electric wire branched and connected to the internal circuit, the number of the circuits connected to the conductive material is reduced, and multilayering is suppressed. And the number of terminals of the wires of the wire harness that goes out of the case can be reduced, and the number of poles of the connector connected to the tip can be reduced.

A group of electric wires connected to the conductive material inside the case to form a branch circuit are wired in parallel in the X direction, and the conductive material is wired in the Y direction to form cross wires in the XY direction. They are connected at the required intersections. With the above configuration, the branch connection circuit is formed by connecting at the required intersection positions. Therefore, when a circuit change occurs, it is only necessary to change the connection position, and the branch circuit can be easily changed. it can.

The wire harness protruding outside the case of the junction box is extended to a position where its tip connector is connected to a connector of another device or a connector of another wire harness. In other words, the wiring harness protruding from the branch connection circuit in the junction box to the outside of the case is extended without a connector to the connector of another device or the above-mentioned tip connector which is connected to the connector of the other wiring harness. Work and the number of parts can be reduced.

[0012]

Next, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an exploded perspective view of a junction box 10, in which a branch connection circuit 12 is accommodated inside an upper case 11 and a lower case 13.

The upper case 11 has a fuse accommodating portion 11a and a relay accommodating portion 11b provided on an upper surface thereof, and an opening 11c for inserting a wire harness is provided on a side surface thereof.

The branch connection circuit 12 has two sets of wire harnesses W / H in which electric wires 14 dedicated to the branch connection circuit 12 are wired in parallel in the Y direction on the upper surface of the insulating plate 15 and connectors 19 are connected to both ends. The middle part of each of the electric wires 16 is wired in the X direction so as to be wired in parallel with the lower surface of the insulating plate 15. As described above, the electric wires 14 and the electric wires 16 cross-wired in the X and Y directions with the insulating plate 15 interposed therebetween, as shown in FIG. The connection is made by ultrasonic welding or resistance welding to form a required branch connection circuit. However, wire harness W /
Among the electric wires constituting H, fuse 22 or relay 2
The electric wire 17 to be connected only to the terminal 3 is not taken in the branch connection circuit 12 by crimping the terminal 18 to the end.

The wires 16 and 17 of the wire harness W / H are insulated wires, and the wire 14 dedicated to the branch connection circuit 12 is a non-insulated single-core wire, and the insulated wire 16 and the single-core wire are used. In the case of ultrasonic welding, the insulating coating of the electric wire 16 is automatically melted by ultrasonic vibration and the core wire of the electric wire 16 and the single-core electric wire 14 can be connected. In addition, even if the electric wire 14 is a coated electric wire, the core wires can be connected by melting both insulating coatings by ultrasonic welding. When resistance welding is used, the insulation coating at the required position of the electric wire 16 is peeled in advance.

Although FIGS. 1 and 2 disclose only the wires 14 and 16 that are laid in the X and Y directions with the insulating plate 15 interposed therebetween, the electric wires 14 and 16 are further arranged vertically below the insulating plate 15 below or above. Cross-wire the wires in the −Y direction, weld the required intersections of these wires in the same manner as described above to form the required branch connection circuit, and cross-wire the wires across this insulating plate. A required number of circuit bodies are stacked to assemble a branch connection circuit. Also in these laminated circuit bodies, the electric wire 1 of the wire harness W / H is used as the electric wire in the X direction.
It goes without saying that 6 may be used.

As shown in FIG. 2, the electric wire 17 which only needs to be connected to the fuse 22 or the relay 23 is connected to the fuse housing 11a and the relay housing 11b.
8 is housed directly. The terminal 18 at the end of the electric wire 17
As shown in FIG. 3 (A), a pair of left and right holding pieces 18 for branching the electric contact portion at the tip from the wire crimping portion 18a into a tuning fork shape.
b, and a lip 18
c is formed so as to protrude in the approaching direction, and is press-connected to the terminals 22 a and 23 a of the fuse 22 or the relay 23. The shape of the terminal 18 is not limited to the above, and may be a terminal 18 'as shown in FIG. The terminal 18 'is provided with a pair of left and right holding pieces 18b' for branching an electric contact portion at the tip end of the wire crimping portion 18a 'into a tuning fork shape. 'Are continuous.

Terminal 22 of fuse 22 and relay 23
a and 23a that need to be connected to the branch connection circuit 12 are connected to the electric wire 14 or the electric wire 16 via the bus bar 20 or the relay terminal 21 whose one end is housed in the fuse housing 11a or the relay housing 11b. Connected.
As shown in FIG. 4A, the bus bar 20 is provided with a press-contact tab 20a having one end bent upward and a press-contact tab 20b having the other end bent downward.
As shown in (B), the press contact slots 21a, 21
b. A press-contact blade is provided on the inner peripheral edge of the press-contact slot connected to the coated electric wire, and the insulating coating is cut to make contact with the core wire.

Next, a modification of the branch connection circuit 12 of the first embodiment will be described. FIG. 5 is a bottom perspective view of the branch connection circuit 12 'of this modification, in which a connector 19 is connected to one end and four sets of wire harnesses W / are cut at the other end.
The cut side of each of the electric wires 16 ′ of H ′ is wired in the X direction so as to be wired in parallel to one surface of the insulating plate 15, and is insulated from the electric wire 14 dedicated to the branch connection circuit 12 that is wired in parallel to the other surface in the Y direction. The connection is made through a hole 15a of the plate 15. The other configuration is the same as that of the first embodiment, and the description is omitted.

FIG. 6 shows a second embodiment. In the present embodiment, an electric wire 17 ′ that is connected only to the fuse 22 or the relay 23 is provided as an intermediate splice on the electric wire 16 that is branched and connected to the electric wire 14.

As shown in FIG. 6, a splice portion S is provided by connecting the other end of the electric wire 17 'to which the terminal 18 is crimped to the intermediate portion of the electric wire 16. Splice S
As shown in FIG. 7, the core wire exposed by peeling off the coating of the middle part of the electric wire 16 and the core wire exposed by peeling off the terminal coating of the electric wire 17 ′ are crimped by the intermediate crimping terminal 25. ing. After crimping, the tape is wound and insulated. Although only one of the wires 17 ′ is spliced to one wire 16, two or more wires may be spliced to the same wire.
The other configuration is the same as that of the first embodiment, and the description is omitted.

FIG. 8 shows a third embodiment. In this embodiment, a circuit that only connects between the fuse 22 and the relay 23 is directly connected to the electric wire 2 without passing through the branch connection circuit 12.
6 is connected.

The electric wire 26 has terminals 18 crimped at both ends thereof, and each terminal 18 is accommodated in the fuse accommodating portion 11a and the relay accommodating portion 11b. By doing so, the number of the bus bars 20 or the relay terminals 21 for connecting the fuse 22 or the relay 23 to the branch connection circuit 12 can be reduced, and the number of the branch connection circuits 12 can also be reduced. Can be suppressed. The other configuration is the same as that of the first embodiment, and the description is omitted.

FIG. 9 shows a fourth embodiment. In the present embodiment, among the electric wires constituting the wire harness W / H, the connector 1 extending from one side of the case to the connector 1 on the other side.
The wires 27 that do not need to be branched up to 9 are not taken into the branch connection circuit 12 but are passed through the case as it is. As a result, the number of circuits in the branch connection circuit 12 can be reduced, and multilayering of the internal circuit can be suppressed.
Note that the other configuration is the same as that of the first embodiment, and a description thereof will not be repeated.

[0025]

As is apparent from the above description, according to the present invention, a terminal is provided at the end of an electric wire that does not need to be branched and connected in the electric wire group of a wire harness, and a fuse accommodating portion and / or a relay accommodating portion are provided. By arranging them directly in the section, the number of circuits connected to the conductive material is reduced, and multilayering of the internal circuit can be suppressed. Further, since the terminal provided at the end of the electric wire is free to move, it is not restricted by the position of the fuse accommodating portion and / or the relay accommodating portion in the case, so that the circuit can be freely designed and changed.

The electric wire connected only to the fuse and / or the relay is preferably connected to an intermediate portion of the electric wire branched and connected to the conductive material by crimping and intermediately spliced. The number of terminals of the electric wires of the harness is reduced, and the number of poles of the tip connector can be reduced.

The wire group forming a branch circuit by connecting with the conductive material inside the case is wired in parallel in the X direction, and the conductive material is wired in the Y direction and connected at a required intersection position. The branch circuit can be easily changed simply by changing the connection position. In addition, the wiring harness protruding from the branch connection circuit in the junction box to the outside of the case can be extended connectorlessly to the connector of another device or the tip connector that connects to the connector of the other wire harness. And the number of parts can be reduced.

[Brief description of the drawings]

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

FIG. 2 is a schematic sectional view of a junction box according to the first embodiment.

FIG. 3A is a perspective view of a terminal according to the first embodiment,
(B) is a perspective view of a modification of the terminal.

FIG. 4A is a perspective view of a bus bar according to the first embodiment,
(B) is a perspective view of a relay terminal.

FIG. 5 is a lower perspective view of a modified example of the branch connection circuit of the first embodiment.

FIG. 6 is an exploded perspective view of a junction box according to a second embodiment.

FIG. 7 is an enlarged perspective view of a splice portion according to a second embodiment.

FIG. 8 is a schematic sectional view of a junction box according to a third embodiment.

FIG. 9 is an exploded perspective view of a junction box according to a fourth embodiment.

FIG. 10 is an exploded perspective view of a conventional junction box.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Junction box 11 Upper case 11a Fuse accommodating part 11b Relay accommodating part 11c Opening 12 Branch connection circuit 13 Lower case 14 Electric wire (conductive material) 15 Insulating board 16, 16 ', 17, 17', 26, 27 Electric wire 18, 18 'Terminal 19 Connector 20 Bus Bar 21 Relay Terminal 22 Fuse 23 Relay S Splice W / H, W / H 'Wire Harness

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Noriko Kobayashi 1-14 Nishisuehiro-cho, Yokkaichi-shi, Mie F-term within Sumitomo Wiring Systems Co., Ltd. 5E077 BB03 BB37 BB38 DD03 DD08 GG21 JJ20 5E085 BB02 BB12 BB13 BB14 CC03 CC04 CC08 CC09 DD04 DD14 GG12 HH06 HH11 JJ38 5G361 BA06 BB01 BB03 BC01

Claims (4)

[Claims] 1. A part of a wire group of a wire harness is inserted into a case of a junction box, and wires that need to be branched and connected to other circuits in the inserted wire group are arranged inside the case. The wires connected only to the fuses and / or relays attached to the fuse accommodating portion and / or the relay accommodating portion provided in the case, while connecting to other conductive materials, are connected to the terminals connected to these wire terminals. A junction box and a wire harness, wherein the junction box and the relay harness are arranged directly in the fuse accommodating section and / or the relay accommodating section and connected to the fuse and / or the relay. 2. The junction box and wire harness connection structure according to claim 1, wherein the electric wire connected only to the fuse and / or the relay is intermediately spliced with the electric wire branched and connected to the conductive material. 3. An electric wire group connected to the conductive material inside the case to form a branch circuit is wired in parallel in the X direction, and the conductive material is wired in the Y direction to provide cross wiring in the XY direction. The connection structure of a junction box and a wire harness according to claim 1 or 2, wherein the connection is made at a required intersection position. 4. The wire harness extending outside the case of the junction box extends to a position where its tip connector is connected to a connector of another device or a connector of another wire harness. Item 4. A connection structure of a junction box and a wire harness according to any one of items 3.