JP2021082440A - Electric wire having terminal - Google Patents

Abstract

To provide an electric wire having a terminal, capable of obtaining sufficient crimping accuracy when crimped to the terminal and excellent in electric contact with the terminal.SOLUTION: An electric wire 10 having a terminal comprises: a core wire 11 including a plurality of copper single wires 12 and a stainless steel single wire 13 mixed with the plurality of copper single wires 12; an insulating coating 14 for covering the core wire 11; and the terminal 15 including a crimping part 17 for crimping and connecting the core wire 11 between a bottom plate part 17a and a pair of wire barrels 17b and 17b. The stainless steel single wire 13 is crimped and connected in a state mixed in the plurality of copper single wires 12 so as to be positioned in the center between the bottom plate part 17a and each tip 17c of the pair of wire barrels 17b and 17b.SELECTED DRAWING: Figure 1

Description

The present invention relates to an electric wire with a terminal for an automobile.

As an electric wire for an automobile of this kind, there is one described in Patent Document 1. The electric wire described in Patent Document 1 includes a core wire portion in which four stainless steel wires having the same diameter are wound so that the overall cross-sectional shape is substantially circular, and eight copper wires having the same diameter. It has an outer peripheral wire portion that is in close contact with each other and is arranged in a single layer around the core wire portion. This outer peripheral line portion is covered with an insulating coating.

JP-A-2007-59123

However, in the conventional electric wire, when the core wire portion and the outer peripheral wire portion are crimp-connected by a pair of wire barrels of terminals, a stainless steel wire having a substantially circular cross section enters between each tip of the pair of wire barrels and the bottom plate portion. Sufficient crimping accuracy (compression rate) may not be obtained. That is, in the case of a stainless steel wire having a core wire having a substantially circular cross section (one wire), there is a risk that the stainless steel wire forming the hard core wire may come into direct contact with the terminal when crimping to the terminal. Electrical contact can be poor.

The present invention has been made in view of the problems of the prior art. An object of the present invention is to provide an electric wire with a terminal which can obtain sufficient crimping accuracy at the time of crimping to the terminal and improve the electrical contact with the terminal.

The electric wire with a terminal according to the aspect of the present invention includes a core wire having a plurality of copper wires and a stainless steel wire mixed with the plurality of copper wires, an insulating coating for covering the core wire, and the core wire. The stainless steel wire is provided with a terminal having a crimping portion for crimping and connecting between the bottom plate portion and the pair of wire barrels, and the stainless steel wire is located at the center between the bottom plate portion and each tip of the pair of wire barrels. It is crimp-connected in a state where it is mixed in a plurality of copper wires.

Each copper wire of the plurality of copper wires is a thin wire, the stainless steel wire is a flat plate shape, and the plate-shaped stainless steel wire is a copper wire of the plurality of thin wires. It is preferably located in the center between the lines.

An index indicating the position of the flat surface of the plate-shaped stainless steel wire is provided on the outer peripheral surface of the insulating coating that covers the copper wires of the plurality of thin wires around the plate-shaped stainless steel wire. Is preferable.

Each copper wire of the plurality of copper wires is a thin wire, the stainless steel wire is a thin wire, and the stainless steel wire of the thin wire is included in the copper wire of the plurality of thin wires. It is preferable that a plurality of these are mixed.

According to the present invention, it is possible to provide an electric wire with a terminal which can obtain sufficient crimping accuracy at the time of crimping to the terminal and improve the electrical contact with the terminal.

It is a perspective view of the main part which shows an example of the electric wire with a terminal which concerns on 1st Embodiment of this invention. FIG. 2 is a cross-sectional view taken along the line II-II in FIG. It is sectional drawing which follows the line III-III in FIG. It is a perspective view of the main part which shows an example of the electric wire with a terminal which concerns on 2nd Embodiment of this invention. It is sectional drawing which follows the VV line in FIG. It is sectional drawing which follows the VI-VI line in FIG. It is a conceptual diagram of the cross section of the electric wire for an automobile of a reference example. It is sectional drawing which shows the state which the terminal was crimp-connected to the core wire of the electric wire of the said reference example.

Hereinafter, the electric wire with a terminal according to the embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a perspective view of a main part showing an example of an electric wire with a terminal according to the first embodiment of the present invention. FIG. 2 is a cross-sectional view taken along the line II-II in FIG. FIG. 3 is a cross-sectional view taken along the line III-III in FIG.

As shown in FIGS. 1 to 3, the electric wire 10 with a terminal of the first embodiment includes a core wire 11, an insulating coating 14 covering the core wire 11, and a terminal 15 crimp-connected to the core wire 11. There is.

As shown in FIGS. 1 and 2, the core wire 11 has a plurality of copper wires 12 and a stainless steel wire 13 mixed in the plurality of copper wires 12. The plurality of copper strands 12 are thin wires having a circular cross-sectional shape and the same diameter. Further, the stainless steel wire 13 has an elliptical cross-sectional shape and a flat plate shape. The flat stainless steel wire 13 is a metal wire for assisting the strength of the electric wire 10 with a terminal, and has low conductivity and is hard, so that it may interfere with compression by crimping. It is arranged so as to be located in the center of the copper wire 12 which is a thin wire of a book. Specifically, for example, a stainless steel plate of SUS304 is used as the material of the flat stainless steel wire 13.

As shown in FIGS. 1 and 2, a plate-shaped stainless steel wire 13 is formed on the outer peripheral surface 14a of the insulating coating 14 that covers the copper wire 12, which is a plurality of thin wires around the flat stainless steel wire 13. Bocchi (index) 14b indicating the position of the flat surface 13a of the above is projected at positions facing each other.

As shown in FIGS. 1 and 3, the terminal 15 is a pair of a box-shaped electrical contact portion 16 that contacts a mating terminal (not shown), a crimp portion 17 that crimps and connects the core wire 11, and a pair that is crimped to the insulating coating 14. It has coated barrels (coated crimp pieces) 18, 18. The crimping portion 17 has a bottom plate portion 17a on which the core wire 11 is placed, and a pair of wire barrels (core wire crimping pieces) 17b and 17b for crimping and crimping the core wire 11 via a crimper and an anvil (not shown). The stainless steel wire 13 forming a part of the core wire 11 is made of copper, which is a plurality of thin wires so as to be located at the center between the bottom plate portion 17a of the crimping portion 17 and the tips 17c of the pair of wire barrels 17b and 17b. It is designed to be crimp-connected in a state of being mixed in the strands 12.

According to the terminal-equipped electric wire 10 of the first embodiment, as shown in FIG. 2, the flat stainless steel wire 13 is surrounded by a plurality of copper wires 12 thinner than the stainless steel wire 13. The core wire 11 is substantially circular. Further, as shown in FIGS. 1 and 3, when the crimping portion 17 of the terminal 15 is crimped to the substantially circular core wire 11, between the bottom plate portion 17a of the crimping portion 17 and the tips 17c of the pair of wire barrels 17b and 17b. It is possible to prevent the flat stainless steel wire 13 of the core wire 11 from entering and hitting the core wire 11. By preventing this abutment, sufficient crimping accuracy can be obtained at the time of crimping to the terminal 15, and the electrical contact with the terminal 15 becomes good.

Further, by providing a bocce 14b indicating the position of the flat surface 13a of the plate-shaped stainless steel wire 13 on the outer peripheral surface 14a of the insulating coating 14 covering the core wire 11, the insulating coating 14 is vertically crimped when the terminal 15 is crimped. The position (position on the crimper side and the position on the anvil side) can be easily determined.

Here, in order to explain the superiority of the first embodiment, reference examples are shown in FIGS. 7 and 8. FIG. 7 is a conceptual diagram of a cross section of an automobile electric wire of a reference example. FIG. 8 is a cross-sectional view showing a state in which terminals are crimp-connected to the core wire of the electric wire of the same reference example.

The electric wire 1 shown in FIG. 7 of this reference example is described in Patent Document 1. That is, the electric wire 1 has a core wire portion 2 in which four stainless steel wire wires 2a having the same diameter are wound around the wire 1 and an overall cross-sectional shape having a substantially circular shape, and eight copper wire rods 3a having the same diameter. It has an outer peripheral wire portion 3 which is closely attached to the core wire portion 2 and is arranged in a single layer around the core wire portion 2. The outer peripheral wire portion 3 is covered with an insulating coating 4.

Then, as shown in FIG. 8, when the terminal 5 is crimp-connected to the exposed outer peripheral wire portion 3 of the terminal of the electric wire 1, the outer peripheral wire portion 3 covering the core wire portion 2 is connected to the pair of wire barrels 6 of the terminals 5. Crimping and crimping with, and 6.

When the terminal 5 is crimp-connected to the outer peripheral wire portion 3 covering the core wire portion 2 of the electric wire 1 of this reference example, as shown in FIG. 8, stainless steel wire 2a having a substantially circular cross section is formed in each of the pair of wire barrels 6 and 6. It may enter between the tip 6a and the bottom plate portion 7, and sufficient crimping accuracy (compression rate) may not be obtained. That is, when the core wire portion 2 is a stainless steel wire 2a having a substantially circular cross section (one), the stainless steel wire 2a forming the hard core wire portion 2 comes into direct contact with the bottom plate portion 7 of the terminal 5 when crimped to the terminal 5. There is a possibility that so-called abutment may occur, and the electrical contact with the terminal 5 may be poor. In addition, as a countermeasure for this problem, it is necessary to newly lay down a terminal with a small range. The terminal-equipped electric wire 10 of the first embodiment can solve these problems.

That is, in the electric wire 1 of the reference example, sufficient crimping accuracy cannot be obtained and the electrical contact with the terminal 5 becomes poor, but in the first embodiment, sufficient crimping accuracy is obtained when crimping to the terminal 15. It is possible to provide an electric wire 10 with a terminal which is obtained and has good electrical contact with the terminal 15. Further, it is not necessary to lay down a terminal dedicated to the electric wire 10 with a terminal whose strength is assisted by a flat stainless steel wire 13, and a terminal 15 that is normally used can be used, and the cost can be reduced accordingly. it can.

FIG. 4 is a perspective view of a main part showing an example of an electric wire with a terminal according to a second embodiment of the present invention. FIG. 5 is a cross-sectional view taken along the line VV in FIG. FIG. 6 is a cross-sectional view taken along the line VI-VI in FIG.

As shown in FIGS. 4 to 6, the electric wire 20 with a terminal of the second embodiment includes a core wire 21, an insulating coating 24 covering the core wire 21, and a terminal 25 crimp-connected to the core wire 21. There is.

As shown in FIGS. 4 and 5, the core wire 21 has a plurality of copper strands 22 and a plurality of stainless steel strands 23 mixed in the plurality of copper strands 22. The plurality of copper strands 22 are thin wires having a circular cross-sectional shape and the same diameter. Further, the plurality of stainless steel wires 23 are thin wires having a circular cross-sectional shape and the same diameter, and have the same diameter as the copper wire 22. Specifically, it is a thin line of SUS304 or SUS316. Further, the plurality of stainless steel wires 23 are metal wires for assisting the strength of the electric wire 20 with terminals, and since they have low conductivity and are hard, they may interfere with compression by crimping. , It is arranged so as to be mixed in dots in the copper wire 22 which is a plurality of thin wires. That is, the number of copper wires 22 is larger than the number of stainless steel wires 23.

As shown in FIGS. 4 and 6, the terminal 25 is a pair of a box-shaped electrical contact portion 26 that contacts a mating terminal (not shown), a crimp portion 27 that crimps and connects the core wire 21, and a pair that is crimped to the insulating coating 24. It has coated barrels (coated crimp pieces) 28 and 28. The crimping portion 27 has a bottom plate portion 27a on which the core wire 21 is placed, and a pair of wire barrels (core wire crimping pieces) 27b and 27b for crimping and crimping the core wire 21 via a crimper and an anvil (not shown). The plurality of stainless steel strands 23 forming a part of the core wire 21 are a plurality of thin wires so as to be located at the center between the bottom plate portion 27a of the crimping portion 27 and the respective tips 27c of the pair of wire barrels 27b and 27b. The copper wire 22 is crimp-connected in a mixed state.

In the electric wire 20 with terminals of the second embodiment, a plurality of stainless steel wires 23 are mixed with a plurality of copper wires 22 to form a core wire 21, so that the same operations and effects as those of the first embodiment are achieved. Play.

That is, in the electric wire 20 with a terminal of the second embodiment, the stainless steel wire 23 is thinned and changed into a plurality of wires. As a result, when the crimping portion 27 of the terminal 25 is crimped to the core wire 21, even if the stainless steel wire 23 enters between the bottom plate portion 27a of the crimping portion 27 and the tips 27c of the pair of wire barrels 27b and 27b, the compression is affected. No inhibition occurs. As a result, sufficient crimping accuracy is obtained at the time of crimping to the terminal 25, and the electrical contact with the terminal 25 is improved.

Further, the copper wire 22 is also thinned, and the stainless steel wire 23 is dispersedly arranged in the plurality of thinned copper wires 22, so that the stainless steel wire 23 is crimped when the terminal 25 is crimped. It is possible to prevent the bottom plate portion 27a of 27 from approaching the center between the tips 27c of the pair of wire barrels 27b and 27b. Further, it is not necessary to lay down a terminal dedicated to the electric wire 20 with a terminal whose strength is assisted by a plurality of stainless steel strands 23, and a normally used terminal 25 can be used, and the cost can be reduced accordingly. Can be done.

Although the present embodiment has been described above, the present embodiment is not limited to these, and various modifications can be made within the scope of the gist of the present embodiment.

That is, according to the first embodiment, the bocce indicating the position of the flat surface of the stainless steel wire on the outer peripheral surface of the insulating coating was used as an index, but the flat surface of the stainless steel wire was used on the outer peripheral surface of the insulating coating. A stripe of a mark indicating the position may be provided.

Further, according to each of the above-described embodiments, the crimping portion of the terminal having the box-shaped electrical contact portion in contact with the mating terminal is crimp-connected to the core wire, but a hole for fastening a bolt such as an LA terminal is provided. The crimping portion of the terminal having the flat plate-shaped electrical contact portion may be crimp-connected to the core wire.

10,20 Electric wire with terminals 11,21 Core wire 12,22 Copper wire 13,23 Stainless steel wire 13a Flat surface 14,24 Insulation coating 14a Peripheral surface 14b Bocchi (index)
15,25 Terminals 17,27 Crimping parts 17a, 27a Bottom plate parts 17b, 17b, 27b, 27b Pair of wire barrels 17c, 27c Tip

Claims (4)

A core wire having a plurality of copper wires and a stainless steel wire mixed with the plurality of copper wires, and
The insulating coating that covers the core wire and
A terminal having a crimping portion for crimping and connecting the core wire between the bottom plate portion and a pair of wire barrels,
With
The stainless steel wire is a wire with a terminal that is crimp-connected in a state of being mixed in the plurality of copper wires so as to be located at the center between the bottom plate and the tips of the pair of wire barrels. Each copper wire of the plurality of copper wires is a thin wire.
The stainless steel wire has a flat plate shape and has a flat plate shape.
The electric wire with a terminal according to claim 1, wherein the plate-shaped stainless steel wire is located at the center between the copper wires of the plurality of thin wires. An index indicating the position of the flat surface of the plate-shaped stainless steel wire is provided on the outer peripheral surface of the insulating coating that covers the copper wires of the plurality of thin wires around the plate-shaped stainless steel wire. The electric wire with a terminal according to claim 2. Each copper wire of the plurality of copper wires is a thin wire.
The stainless steel wire is a thin wire and
The electric wire with a terminal according to claim 1, wherein a plurality of the thin stainless steel wires are mixed in the plurality of thin copper wires.

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