JP2002017018A - Construction of splice of electrical wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply form an intermediate splice and an end concentrated splice. SOLUTION: The insulating coverings of the intermediate parts and the end parts of a plurality of electrical wires are stripped off, and their cores are exposed. In a bundled state of these cores, the band portion of a fastening band having a conductive part at least on the internal surface side of the band portion is wound, and passed through a fastening part to fasten and fix the cores.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intermediate splice structure at an intermediate portion of a plurality of electric wires or a concentrated splice structure at an end of a group of electric wires.

[0002]

2. Description of the Related Art Conventionally, when a plurality of electric wires are intermediately spliced in a wire harness of an automobile, the intermediate wire of the trunk wire w1 shown in FIG. 5 is exposed to expose the core wire w1-c and the terminal of the branch wire w2 is peeled. Then, the core wire w2-c is exposed, and these core wires w1-c and w2-c are overlapped and caulked and crimped by the intermediate crimping terminal 20, and then the tape 21 is wound to perform insulation treatment.

[0003] When a group of electric wires is to be spliced at the terminal end, the ends of the electric wires w are peeled to expose the core wires wc, and the resistance welding machine 26 is bundled with the core wires wc bundled.
Alternatively, the core group is integrally welded by an ultrasonic welding machine, and the insulating resin cap 25 is covered.
The tongue piece 25a and the electric wire group are fixed by winding with a tape 21.

[0004]

In the case of the above-mentioned intermediate splice, it is necessary to crimp the intermediate crimp terminal 20 with a crimping machine, which requires crimping equipment. Also, in the case of the terminal concentrated splice, a very expensive resistance welding machine or ultrasonic welding machine is required. As described above, in both the intermediate splice and the terminal-concentrated splice, there is a problem that splice facilities are required and the cost is increased. Therefore, for example, there has been a problem that it is not possible to cope with a case where an operator simply wants to make a splice connection in a trial stage of a wire harness or the like.

The present invention has been made in view of the above problems, and has as its object to enable an operator to easily connect splices without using an intermediate splice and a terminal concentrated splice.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a method of peeling off the insulating coating of the middle portion or the terminal portion of a plurality of electric wires, exposing the core wires, and bundling the core wires. A wire splice structure is provided in which at least an inner surface side of the band portion is wound around the above-mentioned band portion of a fastening band formed of a highly conductive resin and passed through the fastening portion and fastened and fixed.

The exposed portion of the core of the electric wire and the fastening band are insulated by tape winding. In addition, the terminal concentrated splice may be covered with an insulating resin cap as in the related art.

As described above, in the present invention, a fastening band is provided by using a resin made of the following composition having the same high conductivity as that of a metal, and the fastening band itself has conductivity. Therefore, when the cores of the electric wires are tightened and fixed by the fastening band, the cores and the outer periphery of the core can be reliably brought into contact with the conductive band, and the intermediate splice portion and the terminal splice portion having high electrical connection reliability. Can be formed.

Therefore, it is necessary to form the fastening band at least on the side in contact with the core wire with a highly conductive resin, and on the non-contact side with the core wire with an insulating resin, to form two colors of the highly conductive resin and the insulating resin. The fastening band may be formed by molding. Needless to say, the entire fastening band may be formed of a highly conductive resin.

As described above, since it is only necessary to wind the fastening band around the core wire and tighten it, the operator can easily make a splice connection. Therefore, when a wire harness is prototyped, or when a small quantity is to be produced, the intermediate splice portion and the terminal concentrated splice portion can be formed without using a crimping machine or a welding machine.

Further, since the fastening band is wound around the core wire, the number of electric wires to be spliced can be set to an arbitrary number. In particular, in the case of the intermediate splice, the connection by the conventional intermediate crimping terminal has been limited to two or three wires. However, if the fastening band of the present invention is used, three or more electric wires can be spliced. ,

As the above-mentioned highly conductive resin, Japanese Unexamined Patent Publication No.
As disclosed in JP-A-237331 and JP-A-11-342522, a thermoplastic resin mixed with a metal fiber made of copper, nickel, iron, or the like, a lead-free solder (low melting point solder) and copper powder are used. Made of a thermoplastic resin in which a low-melting alloy made of

As the thermoplastic resin into which the metal fibers are mixed or the low melting point alloy is dispersed, polypropylene,
Polyethylene, polystyrene, acrylonitrile / butadiene / styrene resin, modified polyphenylene oxide, polyethylene terephthalate, polybutylene terephthalate, polyamide, aromatic polyamide, polyphenylene sulfide, polyetherimide, polybenzimidazole, polyetheretherketone, polyethersulfone, liquid crystal Polymers or the like are used alone or in combination. In particular, acrylonitrile-butadiene-styrene resin and polybutylene terephthalate are preferable because metal fibers and low melting point alloys can be easily dispersed and the moldability is good.

As the low melting point alloy dispersed in the thermoplastic resin, an alloy which has a melting point of 100 ° C. or more, preferably 200 ° C. or more and is melted and uniformly dispersed at the time of injection molding of the thermoplastic resin is used. -Pb system, Sn-Bi system, S
n-Cu system, Sn-Ag system, Sn-In system, Bi-Pb
System, Sn-Ag-Pb system, Sn-Bi-In system, Sn-
Bi-P type and Sn-Cu-Ni-Pb type are mentioned.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1A and 1B show a fastening band 1 for an intermediate splice and a terminal concentrated splice used in the present invention, and the entirety of the fastening band 1 is integrally formed of the above-described highly conductive resin.

The fastening band 1 has a fastening portion 2 and a band portion 3 extending from the bottom. The fastening portion 2 has a band insertion hole 2a, and a locking claw 2b projecting downward is provided on the upper inner surface of the band insertion hole 2a. Band part 3
Has a long band shape, and a saw blade-shaped locked portion 3a that can be locked to the locking claw 2b is continuously provided on a surface that becomes an outer peripheral surface at the time of winding. It is preferable that the band portion 3 be wide so that the electric contact area can be increased.

FIG. 2 (A) using the above-mentioned fastening band 1.
As shown in (B), a plurality of electric wire groups are terminally spliced. That is, as in the conventional case, the insulating coatings wh of the terminals of the plurality of electric wires w are respectively peeled off by a required length to expose the cores wc, and the cores wc are bundled. In this state, at the position with the required dimensions from the tip,
The band part 3 of the fastening band 1 is wound around the band part 3.
The tip is passed through the insertion hole 2a of the fastening portion 2 and pulled to pull the locking claw 2b of the fastening portion 2 at a required position to the locked portion 3a of the band portion 3.
Are locked to fix the fastening state. An extra portion of the band portion 3 extending from the fastening portion 2 is cut.

The core wire w- bundled by the fastening band 1 in this manner.
c, the core wires wc are pressed against each other, and the outer peripheral surface of the bundled core wires wc is
Is brought into surface contact with the inner peripheral surface of the terminal to achieve conduction, and the terminal concentrated splice portion 5 is formed.

Next, as shown in FIG. 2C, a tape 6 is wound around the outer periphery of the fastening band 1 and the core wire wc.
Further, the tape 6 is also wound around the end face side of the core wire w-c to cover it. Thus, the fastening band 1 having conductivity
In addition, since the entire core wire w-c exposed by peeling is covered with the tape 6, the terminal concentrated splice portion 5 can be insulated. Note that a tape 7 may be wound around the terminal group at a position separated by a required distance from the terminal concentrated splice portion 5. Due to the winding of the tape 7, even if a pulling force acts on the wire group, the terminal concentrated splice portion 5
And the load on the terminal concentrated splice portion 5 can be reduced. In the insulation treatment of the terminal concentrated splice portion 5, instead of the winding of the tape 6, the insulating cap shown in the above-mentioned conventional example may be covered, and the tongue piece may be fixed to the wire group by tape winding.

FIGS. 3A, 3B and 3C show a second embodiment, in which a plurality of electric wires are spliced intermediately using a fastening band 1 molded of the above-mentioned highly conductive resin.

An intermediate splicing trunk w1 and a branch w2
In the same manner as in the prior art, the middle line w1
While exposing -c, the end of the branch line w2 is peeled off to expose the core wire w2-c. This exposed core wire w1
-C and w2-c are overlapped, the band portion 3 of the fastening band 1 is wound, and the end is passed through the insertion hole 2a of the fastening portion 2 and fastened to form the intermediate splice portion 8. An extra portion of the band portion extending from the fastening portion 2 is cut off.

Thereafter, as shown in FIG. 3C, a tape 6 is wound around the fastening band 1 and the exposed portion of the core to insulate the band. Further, at a position slightly away from the intermediate splice portion 8 around which the tape 6 is wound, the tape 7 is attached to the electric wires w1 and w2.
To prevent the wires from coming off from the intermediate splice portion 8 even when the wires w1 and w2 are pulled, and reduce the load on the intermediate splice portion 8.

As described above, since the core wires are fastened by the fastening band 1 made of a conductive resin, the core wires are pressed against each other and the core wire and the band portion 3 are pressed against each other. Connection reliability can be ensured. In addition, since the binding is performed by the fastening band, the number of electric wires can be set to an arbitrary number.

FIG. 4 shows a modification of the fastening band, in which only one surface of the band 3, which is an inner peripheral surface at the time of winding, is formed of a highly conductive resin 10 and the other portion is formed of an insulating resin 11. That is, after a thin strip is formed from a highly conductive resin, the strip is filled in a cavity of a band forming die, and the cavity is filled with an insulating resin to be integrally molded.

As described above, even if only the inner peripheral surface of the band portion in contact with the core wire is formed of a highly conductive resin, the band can be used as a fastening band for splicing. However, FIG. It is preferable that the entire fastening band shown is integrally formed of a highly conductive resin.

[0026]

As is apparent from the above description, according to the present invention, by using a fastening band formed of a highly conductive resin, the cores of the electric wires are bundled at the middle portion or the terminal portion of the electric wire. The intermediate splice part and the terminal concentrated splice part can be easily formed simply by winding the band part of the fastening band, passing the band through the fastening part, and tightening.

Therefore, the splice portion can be easily formed without using the crimping equipment and the welding equipment which were conventionally required for forming the splice portion. In particular, when the wire harness is small or a prototype, the cost can be reduced.

Since the fastening band is simply wound around the core wire and fastened, there is no limitation on the number of electric wires to be spliced, and there is an advantage that any number of electric wires can be used.

[Brief description of the drawings]

FIG. 1A is a sectional view showing a fastening band used in the present invention, and FIG. 1B is a perspective view.

2A and 2B show a terminal concentrated splicing process according to the first embodiment of the present invention, wherein FIG. 2A is a perspective view of a main part fixed with a fastening band, FIG. 2B is a side view thereof, and FIG. FIG.

3A and 3B show an intermediate splicing step of an electric wire according to a second embodiment of the present invention, wherein FIG. 3A is a perspective view showing a state in which the tip of a fastening band is being inserted into a fastening portion, and FIG. (C) is a plan view wound with an insulating tape.

FIG. 4 is a sectional view showing a modification of the fastening band.

FIGS. 5A to 5D are views showing a conventional intermediate splice of an electric wire.

6 (A) to 6 (C) are views showing a conventional terminal concentrated splice. FIG.

[Explanation of symbols]

 w electric wire wh insulating coating wc core wire 1 fastening band 2 fastening portion 3 band portion 5 terminal concentrated splice portion 6,7 tape 8 intermediate splice portion 10 highly conductive resin 11 insulating resin

Claims (3)

[Claims] 1. A fastening method wherein at least the inner surface side of a band portion is molded with a highly conductive resin in a state where core wires are exposed by peeling an insulating coating of an intermediate portion or a terminal portion of a plurality of electric wires and bundling these core wires. A wire splice structure in which the above-mentioned band portion of the band is wound and passed and fastened and fixed. 2. The wire splice structure according to claim 1, wherein the entirety of the fastening band is formed of a highly conductive resin. 3. The wire splice structure according to claim 1, wherein the exposed portion of the core wire of the wire and the fastening band are insulated by tape winding.