JP2002280091A - Connection structure of electric wires - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connection structure of electric wires capable of reducing the number of parts and mounting man-hour and dispensing with a cover. SOLUTION: Wire harnesses 4 to 6 and a part having no covering of wire harnesses 7 to 9 are connected with an electric conductive plastic part 42 and are covered. Since the electric conductive plastic part is constituted such that electric conductive plastic 41 in which a low melting point alloy 39 is dispersed in thermoplastic resin 38 in a semi-melted condition is formed and low melting point alloys 39 are solidified while they are joined mutually, electric conductivity is ensured. Consequently, the wire harnesses 4 to 6 and 7 to 9 ensure continuity through the copper electron plastic part 42 because the part having no covering is connected with the electric conductive plastic part 42.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric wire connection structure.

[0002]

2. Description of the Related Art Wire harnesses are widely used for electric wiring of automobiles and the like. A conventional connection structure for connecting wire harnesses will be described.
Japanese Patent Application Laid-Open No. Hei 9-161908 discloses that, as shown in FIG.
Are collected, and for each electric wire group, as shown in FIG.
The core wire exposed by removing the coating of the terminal is welded or caulked to the substrate portion 101a and the barrel portion 101b of the connection terminal 101 to form the terminal concentrated splice portion 102, and as shown in FIG. It is disclosed that the terminal portion 101c of the terminal 101 is housed in the connector case 103.

Japanese Patent Application Laid-Open No. 11-204170 discloses an electric connection box 201 as shown in FIGS.
Press-fit terminal mounting portion 20 projecting stepwise from the outer surface of the case
2, the pressing blade portions 203a of the plurality of press contact terminals 203 connected to the internal circuit of the electric connection box 201 are made to protrude from an opening formed at the center of the front end of the press contact terminal mounting portion 202, and the electric wire W is connected to the electric connection box 201. And the electric wire W is connected to the press contact blade portion 203 a of the press contact terminal 203.
The cover 204 for holding the electric wire is placed over the press contact terminal mounting portion 202 in a state where the electric wire W is connected by press contact with the electric wire W, and the electric wire W is fixed in the vicinity of the press connection position by a rib 204 a protruding from the inner wall of the cover 204. It is disclosed.

[0004]

However, the conventional electric wire connection structure has the following problems. (1) The technology disclosed in Japanese Patent Application No. 9-161908 includes a connection terminal 101 and a connector case 1 for connecting an electric wire W.
However, there is a problem that the number of parts increases, the number of steps for mounting increases, and the cost increases. (2) The technology disclosed in Japanese Patent Application No. 11-204170 includes a cover 204 for fixing the electric wire W, a press contact terminal 203,
An electric connection box 201 is required, and a cover 204
Is limited by the shape of the cover 204 because
Since the cover 204 has a convex shape, there is a problem that the cover 204 becomes large.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to provide an electric wire connection structure with a small number of parts, a small number of mounting steps, and no cover.

[0006]

Means for Solving the Problems To achieve the above object, the electric wire connection structure of the present invention has the following configuration. (1) In an electric wire connection structure for conducting three or more covered electric wires, a conductive plastic portion is provided which is in contact with and covers an uncovered portion of the electric wire. (2) The electric wire connection structure described in (1), wherein the conductive plastic portion has a metal connector terminal. (3) In the electric wire connection structure described in (1) or (2), the conductive plastic portion has a specific gravity greater than that of the thermoplastic resin, the first metal finely dispersed in the thermoplastic resin, and the first metal. And a second metal that assists fine dispersion of the first metal in the thermoplastic resin. (4) In any one of the electric wire connection structures described in (1) to (3), the conductive plastic portion is covered with an insulating plastic portion.

Next, the operation of the electric wire connection structure having the above configuration will be described. For example, when making two wires and one wire constituting the wire harness conductive, the coating of the end of each wire is removed, and the uncoated portion of each wire is attached to the conductive plastic part. At this time, the conductive plastic part is formed by, for example, injection molding. That is, in the conductive plastic portion, a portion having no covering of each electric wire is arranged in a mold, and the thermoplastic resin, the first
An injection material obtained by kneading a metal and a second metal is poured into a mold,
It is formed by cooling and solidifying. At this time,
In the conductive plastic portion, the second metal is almost three-dimensionally dispersed in the thermoplastic resin melted during molding, and the first metal in a semi-molten state adheres to the dispersed second metal. Since the first metal is dispersed in the resin, the first metal is molded without being cut and in a state where the first metal is bonded to the adjacent metal. Therefore, the conductive plastic part is one of the connected electric wires.
When electricity is passed through the book, the electricity is conducted to the other two electric wires via the first metal of the conductive plastic portion. As described above, since each wire can be conducted simply by connecting and covering a portion having no covering of three or more wires to the conductive plastic portion, the number of parts and the number of mounting steps are reduced,
The cost can be reduced, and the connection portion of the covered electric wire can be made compact.

Here, when the conductive plastic portion is formed, a metal connector terminal is disposed in a mold in addition to a portion having no covering of the electric wire, and injection molding is performed.
A connector covered with the conductive plastic part can be formed. When this connector is connected to, for example, an electric device, a signal input from the connector terminal is output to an electric wire via the first metal of the conductive plastic portion. As described above, since the connector can be formed only by connecting and covering the connector terminal with the conductive plastic portion, the number of parts and the number of mounting steps can be reduced, the cost can be reduced, and the size can be reduced. it can.

Further, the conductive plastic portion is covered with an insulating plastic portion to insulate a current flowing through the conductive plastic portion. That is, for example, the conductive plastic portion is placed in a mold, the molten insulating plastic is poured, and the insulating plastic is cooled and solidified, so that the insulating plastic portion covers the conductive plastic portion. Form. In this manner, by covering the conductive plastic portion with the insulating plastic portion, electric leakage and the like can be prevented, and the reliability of connection can be improved.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) Hereinafter, an electric wire connection structure according to a first embodiment of the present invention will be described in detail with reference to the drawings. In the first embodiment, a connection structure of a wire harness that functions by electrically connecting electric and electronic devices of an automobile will be described as an example. Various electric and electronic components such as a computer, a sensor, and an actuator are mounted on an automobile, and these electric and electronic components are interconnected by a wire harness. Therefore, many wire harnesses are provided in automobiles.

[0011] As shown in FIG.
Numerals 21 are collected for each same connection group, and connectors 25 and 26 fitted to the harness connecting portions 22 and 23, the junction block 24, and connectors 27 to 31
And are connected to each. Here, the wire harnesses 1 to 21 are obtained by coating a conductive wire obtained by twisting a thin electric wire with vinyl chloride in order to secure insulation.
Further, the harness connecting portions 22 and 23 are blocks for connecting the wire harnesses. The junction block 24 is a block in which fuses and relays are centrally arranged. The connectors 25 to 31 are components for connecting the wire harnesses 1 to 21 to the electric circuit of the electric / electronic device.

As shown in FIGS. 2 and 3, the harness connecting portions 22 and 23 and the connectors 25 to 31 connect the wire harnesses 1 to 21 to the conductive plastic portions 42 and 58, respectively.
And the conductive plastic parts 42, 58
Is covered with insulating plastic parts 50 and 63,
It has a structure for connecting each of the wire harnesses 1 to 21 in a conductive manner, and the structure is formed by injection molding. Hereinafter, the molding method will be described.

First, the connection structure of the harness connection section 22 will be described. The vinyl chloride of the wire harnesses 4 to 6 and the wire harnesses 7 to 9 is removed from the end to 5 mm to expose the conductor. Then, as shown in FIG. 4, the wires of the wire harnesses 4 to 6 and the wire harness 7 are connected to each other.
The wire harnesses 4 to 6 and the wire harnesses 7 to 9 are arranged in parallel at regular intervals so that the conductive wires No. to No. 9 are opposed to each other within the range of the concave portion 33 of the lower mold 32.
Set to 2. Then, as shown in FIG. 5, the lower mold 32 and the upper mold 34 are fitted so that the recess 33 of the lower mold 32 and the recess 35 of the upper mold 34 are joined to form a cavity space 36. Match. Then, the lower mold 32 and the upper mold 34 are heated to about 80 ° C.

Then, a thermoplastic resin 38, a low melting point alloy ("first metal" in the claims) 39, and a dispersing material (in the claims) from the gate 37 formed in the upper mold 34 to the cavity 36. A second conductive metal 41 is injected. In the present embodiment, as the conductive plastic 41, a thermoplastic resin 38 is used.
PBT / ABS alloy (specific gravity 1.17) 40Vo
1%, 45 Vol% of N-Cu-Ni-P (specific gravity: 7.3), which is a low melting point alloy 39, and 15 Vol% of copper powder (specific gravity: 8.93), which is a dispersing material 40, were lightly mixed, and then 220% A mixture obtained by mixing and kneading well for a predetermined time in a kneader set at ~ 250 ° C and thermoplasticized is used. At this time, the melting point of N—Cu—Ni—P39 is 300 ° C. or less, and the melting point of copper powder 40 is 1000 ° C. or more.
When heated at 0 ° C., the thermoplastic resin 38 melts and N-
Cu-Ni-P39 is semi-melted, and the copper powder 40 does not melt. When the conductive plastic 41 is kneaded under these conditions, the copper powder 40 has a higher specific gravity than N-Cu-Ni-P39, and thus is uniformly dispersed three-dimensionally in the molten thermoplastic resin. And N-Cu-Ni-P39 is
Since it has the property of being easily attached to metal, it adheres around the copper powder 40 and is dispersed in the PBT / ABS alloy 38 in a semi-molten state. Then, the conductive plastic 41 is injected into the upper mold 34 at an injection temperature of 265 ° C. and an injection pressure of 153 Kpa.
By injecting the semi-molten N-Cu-Ni-P39 into the PBT / ABS alloy 38 by injecting it into the cavity space 36 from the gate 37 formed in the cavity space 36, Until uniform.

Then, the molded body of the conductive plastic 41, the wire harnesses 4 to 6, and the wire harnesses 7 to 9 is cooled to solidify the conductive plastic 41, thereby forming the conductive plastic portion 42 shown in FIG. I do. Then, the lower mold 32 and the upper mold 34 are removed from the conductive plastic part 42. Thus, as shown in FIG. 6, the wire harnesses 4 to 6, the wire harnesses 7 to 9, and the conductive plastic portion 42 are integrally formed.

As shown in FIG. 7, the conductive plastic portion 42 formed as described above has an N-Cu-Ni-P39
Are dispersed in the PBT / ABS alloy 38 without being cut, and are molded in a state where they are joined to the adjacent one, so that high conductivity is obtained. Therefore, the current flowing through the wire harnesses 4 to 6 flows through the wire harnesses 7 to 9 via the N-Cu-Ni-P39. Therefore, the conductive plastic part 42 can be connected to the wire harness 4 even if there is no connector case member or connection terminals used for the harness.
To 6 and the wire harnesses 7 to 9 can be connected in a conductive manner.

Then, as shown in FIG. 8, the conductive plastic portion 42 integrated with the wire harnesses 4 to 6 and the wire harnesses 7 to 9 is inserted into the concave portion 44 of the lower mold 43.
The lower mold 43 and the upper mold 45 are heated by placing the lower mold 43 and the upper mold 45 in a cavity space 47 formed by joining the recesses 46 of the upper mold 45 to the lower mold 45. Then, the gate 4 formed on the upper mold 45 is formed.
From 8, the insulating plastic 49 heated and softened is injected into the cavity space 47. In the present embodiment, a PBT resin is used as the insulating plastic 49. Then, the molded body of the insulating plastic 49, the conductive plastic part 42, the wire harnesses 4 to 6, and the wire harnesses 7 to 9 is cooled, and the insulating plastic 49 is cooled.
Is solidified to form the insulating plastic portion 50 shown in FIG. Then, the lower mold 43 and the upper mold 45 are removed from the insulating plastic part 50. Thereby, as shown in FIG. 2, wire harnesses 4-6,
Wire harness 7 to 9, conductive plastic part 42,
The insulating plastic part 50 is integrally formed. still,
In the present embodiment, from the viewpoint of making the harness coupling portion 22 compact and lightweight,
It is formed with a thickness of about 1 mm. Accordingly, since the harness coupling portion 22 is formed in a state where the conductive plastic portion 42 is covered with the insulating plastic portion 50, the electric current flowing through the wire harnesses 4 to 6, the wire harnesses 7 to 9, and the conductive plastic portion 42 is formed. Can be insulated by the insulating plastic portion 50 to prevent electric leakage and the like.

The harness connecting portion 23 connects the wire harnesses 13 to 15 and the wire harnesses 16 to 18 to the wire harnesses 4 to 6 and the wire harnesses 7 to 9.
Similarly, the wire harnesses 19 to 21 are set in the lower mold so as to be orthogonal to the wire harnesses 13 to 15 and the wire harnesses 16 to 18, and the upper mold is attached to the lower mold. To fit. Thereafter, the conductive plastic 41 is injected into the cavity space of the mold, and the conductive plastic 41 is cooled and solidified to form the conductive plastic portion in the same manner as the harness connection portion 22. Then, the conductive plastic part is set in the cavity space of the mold, the insulating plastic 49 is injected into the mold, and the insulating plastic 49 is cooled and solidified to form the insulating plastic part. Thereby, the harness connection portion 23
Is formed in a state in which the conductive plastic portion connected to and covered by the conductive wires of the wire harnesses 13 to 21 is covered with the insulating plastic portion. It is possible to connect the harnesses 13 to 21 in a conductive manner.

Next, the connection structure of the connector 25 will be described. As shown in FIGS. 9 and 10, a plurality of metal connector terminals 51 are set in the lower mold 52, and the vinyl chloride of the wire harnesses 1 to 6 is connected to the lower end 5.
mm to expose the conductive wire portion. Then, the wires of the wire harnesses 1 to 3 and the wire harness 4
The wire harnesses 1 to 3 and the wire harnesses 4 to 6 are arranged at regular intervals and set in the lower mold 52 so that the conductors of No. . Then, the upper mold 54 is fitted to the lower mold 52 so that the recess 53 of the lower mold 52 and the recess 55 of the upper mold 54 are joined to form a cavity space 56. The upper mold 54 is heated to about 80C.

Then, the above-mentioned conductive plastic 41 is injected into the cavity space 56 from the gate 57 formed in the upper mold 34 at an injection temperature of 265 ° C. and an injection pressure of 153 Kpa.
N-Cu-Ni-P
In a state where 39 is dispersed in the PBT / ABS alloy 38, the conductive plastic 41 is uniformly filled up to every corner of the cavity space 56.

Then, the molded body of the conductive plastic 41, the wire harnesses 1 to 3 and the wire harnesses 4 to 6 is cooled to solidify the conductive plastic 41, thereby forming the conductive plastic portion 58 shown in FIG. Then, the lower mold 52 and the upper mold 54 are removed from the conductive plastic part 58. Thereby, as shown in FIG. 11, the wire harnesses 1 to 3 and the wire harnesses 4 to
6. The conductive plastic part 58 is integrally formed.

As shown in FIG. 7, the conductive plastic portion 58 formed as described above is
Since the N-Cu-Ni-P39 of No. 8 is dispersed in the PBT / ABS alloy 38 without being cut, and is molded in a state of maintaining the junction with the adjacent one, high conductivity is obtained.
Therefore, the conductive plastic part 58 transmits the signal input from the connector terminal 51 to the wire harnesses 1 to 3 or the wire harnesses 4 to 4 via the N-Cu-Ni-P 39.
6 can be output.

Then, as shown in FIG. 12, a conductive plastic part 58 integrated with the wire harnesses 1 to 3 and the wire harnesses 4 to 6 is formed between the lower mold 59 and the upper mold 60. And the lower mold 59 and the upper mold 60 are heated. And
The above-mentioned insulating plastic 49 is injected into the cavity 61 from the gate 62 formed in the upper mold 60. Then, the molded body of the insulating plastic 49, the conductive plastic part 58, the wire harnesses 1 to 3, and the wire harnesses 4 to 6 is cooled, and the insulating plastic 49 is cooled.
Is solidified to form the insulating plastic portion 63 shown in FIG. 3, and the lower mold 59 and the upper mold 60 are removed from the insulating plastic portion 63. Thereby, as shown in FIG. 3, the wire harnesses 1 to 3, the wire harnesses 4 to 6, the conductive plastic portion 58, and the insulating plastic portion 63 are integrally formed. The insulating plastic portion 63 is formed to have a thickness of about 1 mm from the viewpoint of making the connector 25 compact and lightweight. Therefore, since the connector 25 is formed in a state where the conductive plastic portion 58 is covered with the insulating plastic portion 63, the connector 25 insulates the current flowing through the conductive plastic portion 58,
It is possible to prevent electric leakage and the like.

The connector 25 thus formed is fitted into a separately formed junction block 24 and integrated therewith, and connected to a fuse or the like in the junction block 24. Therefore, the connector 25 can connect the plurality of connector terminals 51, the wire harnesses 1 to 3, and the wire harnesses 4 to 6 in a conductive manner without a cover or the like for pressing the harness electric wires.

The connector 26 is molded in the same manner as the connector 25, is fitted into the junction block 24, and is integrated. Thereby, the connector 26 is connected to the wire harnesses 10 to 12 and the wire harnesses 13 to 1.
5 can be connected conductively. Each of the connectors 27 to 31 is a box-shaped connector 2 having a projection for fitting into the junction block 24.
5 and the shape is different. However, connectors 27-31
By changing the shape of the cavity space 61 formed between the lower mold 59 and the upper mold 60 used in molding the connector 25, molding can be performed in the same manner as the connector 25.

Therefore, according to the electric wire connection structure of the present embodiment, the harness connecting portions 22 and 23 and the connectors 25 to
31 is the N-Cu-Ni- of the conductive plastic part 42
Since P39 is dispersed in the thermoplastic resin 38 while maintaining the bonding, the connector case member used in the conventional electric wire connection structure, the connection terminal used for the harness, the case for holding down the harness electric wire, and the like. Even without using
The conductive plastic portions 42 and 58 allow the wire harnesses 1 to 21 to conduct. Therefore, the electric wire connection structure of the present embodiment reduces the number of parts,
The cost can be set low and the connection structure of the electric wires can be made compact.

Further, according to the electric wire connection structure of the present embodiment, the harness connecting parts 22 and 23 and the connector are formed by molding the conductive plastic parts 42 and 58 and the insulating plastic parts 50 and 63 by injection molding. 25-31
As compared with the conventional wire connection structure, the number of man-hours for assembling and mounting parts can be reduced, manufacturing costs can be reduced, and the efficiency of wire connection work can be improved. Can be done.

Further, according to the electric wire connection structure of the present embodiment, the wires from which the vinyl chloride has been removed from the wire harnesses 1 to 21 are connected to the harness connecting portions 22 and 23 and the connector 2.
5 to 31 are integrally molded, and the conductive plastic parts 42 and 58 and the insulating plastic parts 50 and 63 are completely formed.
Because there is no possibility that noise or the like will adversely affect the conductive wire or cause leakage. Therefore, according to the electric wire connection structure of the present embodiment, the connection reliability can be improved, and the contact reliability of the connectors 25 to 31 can be improved. Further, since noise generated from the conductive wire does not leak to the outside, it is possible to prevent electromagnetic influence on an electric circuit of an electric / electronic device (not shown).

(Second Embodiment) Next, a second embodiment of the present invention will be described.
An embodiment will be described. The electric wire connection structure of the second embodiment is an improvement of the electric wire connection structure of the first embodiment. Therefore, only the portions different from the first embodiment will be described here, and the description of the common portions will be omitted. Note that components common to the electric wire connection structure of the first embodiment are denoted by the same reference numerals. Second
The electric wire connection structure according to the embodiment has a rubber material 7 shown in FIG.
0 is provided. The rubber member 70 is formed by molding nitrile rubber into a square shape, and has a plurality of through holes 71 through which a wire harness is inserted.

Then, as shown in FIG. 14, the wire harnesses 4 to 6 and the wire harnesses 7 to 9 connected to the conductive plastic part 42 are
By attaching the rubber material 70 to the wire harnesses 4 to 6 and the wire harnesses 7 to 9 by covering the conductive plastic portion 42 with the insulating plastic portion 50, the harness coupling portion 72 shown in FIG. I do. The rubber material 70 provided in the harness coupling portion 72 shown in FIG. 15 is elastically deformed by being pressed by the wire harnesses 4 to 6 and the insulating plastic portion 50 and the wire harnesses 7 to 9 and the insulating plastic portion 50. Then, the space between the wire harnesses 4 to 6 and the insulating plastic part 50 and the space between the wire harnesses 7 to 9 and the insulating plastic part 50 are securely sealed.

Therefore, according to the electric wire connection structure of the second embodiment, the rubber material 70 is provided between the wire harnesses 4 to 6 and the insulating plastic part 50 and between the wire harnesses 7 to 9 and the insulating plastic part. Even if the harness connecting portion 72 is used in a place where the use environment is not good, such as an engine room that is wet with rainwater, the rainwater and the like can prevent the wire harnesses 4 to 6 and the insulating plastic portion 50 from being sealed. There is no leakage to the conductors of the wire harnesses 4 to 6 or the conductors of the wire harnesses 7 to 9 from between or between the wire harnesses 7 to 9 and the insulating plastic part 50. Therefore, it is possible to prevent the conductive wires of the wire harnesses 4 to 6 or the conductive wires of the wire harnesses 7 to 9 from causing corrosion or poor contact due to rust.

Note that the present invention is not limited to the above-described embodiment, and may be implemented by appropriately changing a part of the configuration without departing from the spirit of the invention. That is, in the above embodiment, N-Cu-Ni-P was used as the low melting point alloy 39 of the conductive plastic.
Sn-Pb, Sn-Bi as low-melting point alloy components
System, Sn-Bi-In system, Bi-Pb system, Bi-Sn
System, Sn-Cu system, Sn-Ag system, Sn-Bi-Pb
System, Sn-In system, Sn-Zn system, etc. can be used, and there is no particular limitation as long as it is a component that is melted by a local heating method and diffusion-bonded to a terminal of an electric / electronic component. Also,
In the above embodiment, PBT / ABS alloy is used as the thermoplastic resin 38 of the conductive plastic, but propylene, polyethylene, polystyrene, acrylonitrile-butadiene-styrene resin, modified polyphenylene oxide resin, polybutylene terephthalate resin, polyethylene terephthalate resin And resins such as polyamide resin, aromatic polyamide resin, polyphenylene sulfide resin, liquid crystal polymer, polyetherimide, polybenzimidazole, polyetheretherketone, and polyethersulfone. In addition, what was polymer-blended with another resin is also included here. Further, in the above-described embodiment, copper powder is used as the dispersant 40 of the conductive plastic, but nickel, aluminum, chromium, or the like, or an alloy thereof may be used.

In the above embodiment, the PBT resin is used as the insulating plastic 49. However, propylene, polyethylene, polystyrene, acrylonitrile.
Butadiene / styrene resin, modified polyphenylene oxide resin, polyethylene terephthalate resin, polyamide resin, aromatic polyamide resin, polyphenylene sulfide resin, liquid crystal polymer, polyetherimide, polybenzimidazole, polyetheretherketone, polyethersulfone, etc. May be used. still,
Polymer blends with other resins are also included herein.

In the above embodiment, the thickness of the insulating portion is 1 mm, but the insulating portion may be formed within 2 mm. In the above embodiment, the conductive plastic portion 42,
Although the insulating plastic portions 50 and 63 are formed after molding the 58, the conductive plastic portions 42 and 58 may be formed after the insulating plastic portions 50 and 63 are formed. In this case, since the conductive plastic parts 42 and 58 are exposed to the outside, it is necessary to newly form an insulating sealing material to insulate the external conductive plastic surface.

Although the rubber material 70 made of nitrile rubber is used in the second embodiment, a rubber material made of EPDM may be used, or an elastic polymer may be attached in advance and the insulating plastic part 50 may be used. May be molded.
Further, in the second embodiment, the wire harnesses 4 to 6 are inserted through the rubber material 70 having a rectangular column shape, but an annular rubber material may be fitted to each of the wire harnesses 4 to 6.

[0036]

As described above in detail, according to the present invention, in the electric wire connection structure for conducting three or more covered electric wires, the conductive plastic portion which comes into contact with and covers the non-coated portion of the electric wire. Since it has, the number of parts and the number of mounting steps can be reduced, and the cost can be reduced.
The connecting portion of the covered electric wire can be made compact.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a part of a wire harness provided in an automobile according to a first embodiment of the present invention.

FIG. 2 is also a cross-sectional view of a harness connection portion.

FIG. 3 is a sectional view of the connector.

FIG. 4 is a top view of a lower mold in which a wire is installed in a step of forming a harness connection portion, similarly.

FIG. 5 is a cross-sectional view of a mold in which an electric wire is installed, which is a step of forming a harness joint.

FIG. 6 is a cross-sectional view of a conductive plastic part which is also a step of forming a harness connection part and is connected to and covers an uncovered part of an electric wire.

FIG. 7 is a schematic structural view of a conductive plastic part.

FIG. 8 is a cross-sectional view of a mold in which a conductive plastic part is connected and covered with an uncovered portion of an electric wire in a step of forming a harness joint.

FIG. 9 is a top view of the lower mold in which the connector and the electric wire are arranged in the same step of molding the connector.

FIG. 10 is also a step of molding the connector,
It is sectional drawing of the metal mold | die in which the electric wire and the connector terminal were installed.

FIG. 11 is also a step of molding a connector,
It is sectional drawing of the electrically conductive plastic part connected and covered with an electric wire and a connector terminal.

FIG. 12 is also a step of molding a connector,
It is sectional drawing of the metal mold | die in which the part which does not have a coating | cover of an electric wire and the conductive plastic part connected and covered with a connector terminal are installed.

FIG. 13 is an external perspective view of a rubber material according to the second embodiment of the present invention.

FIG. 14 is a view showing a state in which a rubber material is attached to an electric wire having no coating.

FIG. 15 is a cross-sectional view of a harness connection portion formed by attaching a rubber material.

FIG. 16 is a diagram showing a harness coupling portion disclosed in Japanese Patent Application Laid-Open No. 9-161908.

FIG. 17 is a diagram showing connection terminals for concentrated splicing disclosed in Japanese Patent Application Laid-Open No. 9-161908.

FIG. 18 is a diagram showing a junction block disclosed in Japanese Patent Application Laid-Open No. 11-204170.

FIG. 19 is a diagram showing a connection structure for electric wires disclosed in Japanese Patent Application Laid-Open No. 11-204170.

[Explanation of symbols]

 1-21 Insulated wire 38 Thermoplastic resin 39 Low melting point alloy 40 Dispersing material 42 Conductive plastic part 50 Insulating plastic part 51 Connector terminal

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (Reference) // B29K 105: 22 B29K 105: 22 B29L 31:36 B29L 31:36 (72) Inventor Shogo Izawa Aichi 2-1, 1-1 Asahi-cho, Kariya-shi Aisin Seiki Co., Ltd. (72) Inventor Kenshi Tanigaki 2-1-1 Asahi-cho, Kariya-shi, Aichi F-term in Aisin Seiki Co., Ltd. 4F206 AA13 AA25 AD03 AD05 AD15 AD20 AD03 AH34 JA07 JB12 JF05 JL02 JM04 JQ81 5G309 AA11 5G355 AA03 BA01 BA11 5G375 AA02 BA26 BB46 CA02 CA12 CB05 EA17

Claims (4)

[Claims] 1. An electric wire connection structure for conducting three or more covered electric wires, wherein the electric wire connection structure comprises a conductive plastic portion which comes into contact with and covers an uncoated portion of the electric wire. 2. The electric wire connection structure according to claim 1, wherein the conductive plastic portion has a metal connector terminal. 3. The electric wire connection structure according to claim 1, wherein the conductive plastic portion comprises: a thermoplastic resin; a first metal finely dispersed in the thermoplastic resin; And a second metal having a specific gravity greater than that of the metal and assisting the fine dispersion of the first metal in the thermoplastic resin. 4. The electric wire connection structure according to claim 1, wherein the conductive plastic portion is covered with an insulating plastic portion.