JP2012028154A - Terminal structure of wire harness - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a terminal structure of an on-vehicle wire harness with high corrosion prevention effect.SOLUTION: In an end region of a cable 10, a caulked part 1A formed at one end of a terminal fitting 1 is caulked along an outer circumference of a coated part of the cable 10, and the terminal fitting 1 is fixed at an end portion of the cable 10. A resin part 20 is formed so as to completely cover an entire outer circumference of at least an exposed end region of the caulked part 1A (a region including a cut face 1r and a base edge portion 1e) and its surrounding region. The resin part 20 includes an ethylene-α-olefin copolymer whose melt flow rate at 190°C under 21.18 N measured in accordance with JIS K6922-1 is 200 g per 10 minutes or more, and is composed of a material whose copolymerization ratio of α-olefin in the ethylene-α-olefin copolymer is 10 wt.% or more.

Description

  The present invention relates to a terminal structure of an in-vehicle wire harness.

  In a terminal of a wire harness that is fixed to a predetermined terminal fitting, for example, there is a coated wire terminal connecting portion disclosed in Patent Document 1 as a structure that is resin-molded and waterproofed.

  The covered electric wire terminal connecting portion shown in Patent Document 1 is a molded hollow mold that accommodates and sets a terminal connecting portion in which a terminal metal fitting is crimped to a tip end conductor of a covered electric wire inside a molding die composed of upper and lower molds. By providing a space and injecting and injecting a molten mold resin into the mold space, a resin-molded coated wire terminal connection portion is obtained.

  Thus, the covered electric wire terminal connection part shown by patent document 1 is exhibiting a certain waterproof and corrosion prevention effect by resin-molding the terminal part of a wire harness.

Japanese Patent No. 3627846

  However, in the covered electric wire terminal connecting portion disclosed in Patent Document 1, the mold resin prevents the flatness of the back surface of the terminal metal piece from the viewpoint of installing the terminal metal piece on the flat surface of the automobile body or the like. It was only applied at a non-level.

  Therefore, since the back surface of the terminal fitting is not completely resin-molded, there has been a problem that a sufficient corrosion prevention effect cannot be exhibited.

  The present invention has been made to solve the above-described problems, and an object thereof is to obtain a terminal structure of an in-vehicle wire harness having a high degree of corrosion prevention effect.

  The terminal structure of the wire harness according to the present invention is a terminal structure of a vehicle-mounted wire harness, and includes a covered electric wire formed by covering a plurality of bare wire conductors with a covering portion, and the plurality of bare wire conductors are partially The terminal has an exposed wire exposed portion and is further provided with a terminal fitting fixed to the covered electric wire, and the terminal fitting is provided at one end thereof on the outer periphery of the covered portion of the covered electric wire in the vicinity of the exposed wire portion. A resin part that has a caulking part that is fixed to the covered electric wire by being caulked along, and that covers at least an end-exposed region of the caulking part and an entire outer periphery of the vicinity thereof; The melt flow rate at 190 ° C. and 21.18 N measured according to JIS K6922-1 is 200 g / 10 min. The ethylene-α olefin copolymer is contained, and the α-olefin copolymerization ratio in the ethylene-α olefin copolymer is 10% by mass or more.

  Here, the α-olefin is preferably one or more selected from vinyl esters, α, β-unsaturated carboxylic acid alkyl esters, and carboxyl group-containing monomers.

  Moreover, it is preferable that the said terminal metal fitting has the plating area | region by which the surface was plated, and the said edge part exposure area | region of the said crimping part contains the non-plating area | region which has not been plated.

  Preferably, the constituent material of the plurality of bare wire conductors includes aluminum, the constituent material of the terminal fitting includes copper, and the plating material of the plating region includes tin.

  In the present invention, the resin part is formed so as to cover the entire outer periphery of the end exposed area of the caulking part and the vicinity thereof, so that the electrolyte enters from the end exposed area, and the constituent material of the caulking part is eroded, Eventually, the risk that a part of the bare wire conductor is eroded can be avoided. Furthermore, the resin part has a melt flow rate of 200 g / 10 min. At 190 ° C. and 21.18 N measured according to JIS K6922-1. Since it contains the above ethylene-α olefin copolymer and is formed from a material having a copolymerization ratio of α olefin in the ethylene-α olefin copolymer of 10% by mass or more, the anticorrosion performance also from the material aspect. It can contribute to improvement.

  As a result, it is possible to obtain an in-vehicle wire harness terminal structure having a high degree of corrosion prevention effect.

  Here, when the α olefin is one or more selected from vinyl ester, α, β-unsaturated carboxylic acid alkyl ester, and carboxyl group-containing monomer, the polar functional group of α olefin Thus, the affinity between the bare wire conductor and terminal fitting and the resin portion is excellent. Therefore, it is particularly excellent in anticorrosion performance.

  In addition, when the surface of the terminal fitting has a plated region where the end portion is exposed and the end portion exposed region of the caulking portion includes a non-plated region which is not plated, the resin portion causes the end portion to end. It is possible to reliably avoid the risk that the electrolyte enters from the part-exposed region and eventually a part of the bare wire conductor is eroded.

  Therefore, even if the end portion exposed area of the caulking portion becomes a non-plating region that is not subjected to the plating process due to processing or the like for obtaining the caulking portion, it is not necessary to perform the plating process again, and thus the caulking portion is provided. The manufacturing cost of the terminal fitting can be reduced.

  Further, even when using a combination of metals having a high possibility of erosion chain from a terminal metal fitting made of copper to a plurality of bare wire conductors made of aluminum, the resin portion allows the above-mentioned It is possible to reliably avoid the risk that the electrolytic solution enters from the end exposed region and eventually a part of the bare wire conductor is eroded.

  Therefore, in this case, the terminal structure of the wire harness excellent in usability can be obtained by using copper and aluminum suitable for the terminal fitting and the bare wire conductor.

It is explanatory drawing which shows typically the cross-section of the terminal of the vehicle-mounted wire harness which is embodiment of this invention. It is explanatory drawing which shows the dimensional characteristic of the terminal structure of the wire harness of this Embodiment. It is sectional drawing which shows the AA cross section of FIG. It is explanatory drawing for demonstrating the effect of this Embodiment. It is explanatory drawing which shows the other aspect of this Embodiment typically. It is explanatory drawing which shows the terminal structure of the conventional wire harness corresponding to embodiment. It is a figure for demonstrating typically the corrosion test method in an Example.

<Embodiment>
(Construction)
FIG. 1 is an explanatory view schematically showing a cross-sectional structure of a terminal of an in-vehicle wire harness according to an embodiment of the present invention.

  As shown in the figure, a covered electric wire 10 obtained by insulatingly covering a plurality of bare wire conductors 11 with a covering portion 13 (not shown in FIG. 1) is a part of a conductor group 12 composed of a plurality of bare wire conductors 11. Has an exposed wire portion 22 exposed at the terminal portion. For example, aluminum is used as a constituent material of the bare wire conductor 11.

  And the terminal metal fitting 1 is fixed to the terminal part of this covered electric wire 10. That is, in the terminal region of the covered electric wire 10, the caulking portion 1 </ b> A formed at one end of the terminal fitting 1 is caulked along the outer periphery of the covered portion of the covered electric wire 10, and in addition, the caulking portion 1 </ b> B (caulking portion) of the terminal fitting 1. The terminal fitting 1 is fixed to the terminal portion of the covered electric wire 10 by caulking along the outer periphery of the conductor group 12 in the electric wire exposed portion 22. For example, brass or a copper alloy is used as a constituent material of the terminal fitting 1.

  In addition, the terminal fitting 1 has a plated region 1m by pre-plating the surface with tin, but when processing the caulking portion 1A and the caulking portion 1B, there is a fracture surface 1r where the surface copper is exposed. Yes. In FIG. 1, the surface portion of the fracture surface 1r is indicated by a bold line.

  Then, at least the end exposed region of the caulking portion 1A (the region including the fracture surface 1r and the root edge portion 1e at the right end in the drawing) and the entire outer periphery of the vicinity region are completely covered to form the resin portion 20. The resin portion 20 is also formed in the upper region of the terminal fitting 1 from the caulking portion 1A to the electric wire exposed portion 22 and the caulking portion 1B. The resin portion 20 is preferably a molded body by a molding method from the viewpoint of easy adjustment of dimension setting and the like. The resin part 20 can also be formed using methods such as dripping, coating, and extrusion.

  FIG. 2 is an explanatory diagram showing dimensional characteristics of the terminal structure of the wire harness of the present embodiment. As shown in the figure, starting from the root edge portion 1e of the end exposed area on the back surface of the caulking portion 1A, 1 mm or more in the one end direction (covered electric wire 10 direction) of the terminal fitting 1, and the other end direction (caulking portion 1B) In the conductor group 12 direction), a resin portion 20 is formed with a width of 1 mm or more. Moreover, the film thickness of the resin part 20 in the root edge part 1e is set to 0.1 mm or more.

  Accordingly, the resin portion 20 is formed with dimensional characteristics that completely cover the root edge portion 1e and can completely avoid the adverse effects caused by the erosion of tin, which is the plating material in the plating region 1m.

  3 is a cross-sectional view showing a cross-sectional structure taken along the line AA of FIG. As shown in the figure, the resin portion 20 is formed by completely covering the entire outer periphery of the caulking portion 1A in the AA cross section (one end cross section of the terminal fitting 1 (caulking portion 1A)) in FIG. That is, the resin portion 20 is formed so as to cover the entire outer periphery of the caulking portion 1A with a film thickness of 0.1 mm or more. In addition, as shown in FIG. 3, the covered electric wire 10 is comprised from the conductor group 12 and the coating | coated part 13 of the outer periphery.

  In the terminal structure of the wire harness of the present embodiment, the resin part forming material for forming the resin part 20 is mainly composed of an ethylene-α-olefin copolymer. The resin part forming material may be composed of an ethylene-α-olefin copolymer alone, or may contain additives and other polymers as long as the physical properties are not impaired.

  In the resin part forming material, the ethylene-α-olefin copolymer has a melt flow rate (MFR) of 200 g / 10 min. At 190 ° C. and 21.18 N measured according to JIS K6922-1. That's it. The MFR of the ethylene-α olefin copolymer is 200 g / 10 min. If it is less than the range, the fluidity is low and the portion to be subjected to the anticorrosion treatment cannot be sufficiently covered, so that the anticorrosion effect cannot be sufficiently exhibited. Further, the MFR of the ethylene-α olefin copolymer is more preferably 500 g / 10 min. Or more, more preferably 1000 g / 10 min. That's it.

  In the resin part forming material, the ethylene-α-olefin copolymer has a copolymerization ratio of α-olefin of 10% by mass or more. If the copolymerization ratio of the α-olefin is less than 10% by mass, the affinity (wetability) with the bare wire conductor and the terminal fitting is not sufficient, and the anticorrosion effect cannot be exhibited sufficiently. Further, from the viewpoint of excellent anticorrosion effect, the copolymerization ratio of α-olefin is preferably 15% by mass or more, and more preferably 20% by mass or more.

  Preferred examples of the α-olefin in the ethylene-α-olefin copolymer include vinyl esters, α, β-unsaturated carboxylic acid alkyl esters, and carboxyl group-containing monomers. These α-olefins are particularly excellent in the effect of increasing the affinity (wetability) with bare wire conductors and terminal fittings. The ethylene-α olefin copolymer may be a copolymer of ethylene and one kind of α olefin, or may be a copolymer of ethylene and two or more kinds of α olefins.

  Examples of the vinyl ester include vinyl propionate, vinyl acetate, vinyl caproate, vinyl caprylate, vinyl laurate, vinyl stearate, vinyl trifluoroacetate, and the like.

  Examples of the α, β-unsaturated carboxylic acid alkyl ester include methyl acrylate, methyl methacrylate, ethyl acrylate, and ethyl methacrylate.

  Examples of the carboxyl group-containing monomer include maleic anhydride.

  Specific examples of suitable ethylene-α olefin copolymers include ethylene-vinyl acetate copolymer (EVA), ethylene-ethyl acrylate copolymer (EEA), and ethylene-methyl acrylate copolymer. (EMA), ethylene-methyl methacrylate copolymer (EMMA), ethylene-methyl acrylate-maleic anhydride-modified copolymer (maleic anhydride-modified EMA), and the like.

  In the resin part forming material, the additive that can be added as needed is not particularly limited as long as it is an additive that is generally used for a resin molding material. Specifically, for example, inorganic fillers, antioxidants, metal deactivators (copper damage inhibitors), UV absorbers, UV masking agents, flame retardant aids, processing aids (lubricants, waxes, etc.), Examples thereof include carbon and other coloring pigments.

  Moreover, polymer components other than an ethylene-alpha olefin copolymer may be mix | blended with the resin part formation material as needed.

  The ethylene-α-olefin copolymer and the polymer component blended as necessary may be cross-linked as necessary for the purpose of increasing heat resistance and mechanical strength. There are no particular limitations on the means of crosslinking, such as thermal crosslinking, chemical crosslinking, silane crosslinking, electron beam crosslinking, and ultraviolet crosslinking. In addition, what is necessary is just to perform the bridge | crosslinking process of the resin part formation material, after covering the part which performs an anticorrosion process with the resin part formation material.

(Comparison with conventional)
4 and 6 are explanatory diagrams for explaining the effect of the present embodiment. FIG. 4 shows a structure of the embodiment, and FIG. 6 shows a conventional structure corresponding to the embodiment.

  The structure of FIG. 4 is the same as that of the embodiment described with reference to FIGS. On the other hand, in the conventional structure shown in FIG. 6, the region where the resin portion 30 is formed extends to the root edge portion 1e of the caulking portion 1A so as to cover the back surface of the covered electric wire 10. However, since the resin portion 30 is not formed on the back surface of the caulking portion 1A, it is not formed so as to completely cover the region including the root edge portion 1e.

  Accordingly, seawater or the like is submerged as an electrolytic solution from the root edge portion 1e and travels through the electrolytic solution mixing path R1 while eroding the brass or copper alloy, which is a constituent material of the terminal fitting 1 (caulking portion 1A), and the tin plating on the surface. Therefore, the possibility of electrolyte intrusion cannot be avoided reliably. As a result, when the electrolytic solution reaches the conductor group 12 through the electrolytic solution mixing path R1, aluminum that is a constituent material of the bare wire conductor 11 has a higher ionization tendency than brass or a copper alloy that is a terminal constituent material, and thus erodes. Is done.

  Thus, since the resin part 30 in the terminal structure of the conventional wire harness represented by patent document 1 etc. does not completely cover the root edge part 1e of the caulking part 1A, the electrolyte solution mixing path R1 is completely blocked. As a result, there is a problem that the bare wire conductor 11 may be eroded.

  On the other hand, as shown in FIG. 4 (and FIGS. 1 to 3), the terminal structure of the wire harness according to the first embodiment completely covers the outer periphery of the end exposed region of the caulking portion 1A including the root edge portion 1e. Since the resin part 20 is formed, as shown in FIG. 4, the virtual electrolyte solution mixing path R2 from the fracture surface 1r at one end of the terminal fitting 1 can be completely blocked.

  Thus, in the terminal structure of the wire harness of the present embodiment, the resin portion 20 is formed so as to completely cover the entire outer periphery of the end portion exposed region that becomes the fractured surface 1r of the caulking portion 1A and the vicinity thereof, The electrolyte enters from the fractured surface 1r (root edge portion 1e) in the exposed end region, and the brass or copper alloy of the caulking portion 1A and the tin plating on the surface are eroded, and finally a part of the bare wire conductor 11 The risk of erosion can be reliably avoided.

  Further, the resin part 20 has a melt flow rate of 200 g / 10 min. At 190 ° C. and 21.18 N measured according to JIS K6922-1. Since it contains the above ethylene-α olefin copolymer and is formed from a material having a copolymerization ratio of α olefin in the ethylene-α olefin copolymer of 10% by mass or more, the anticorrosion performance is also improved from the material aspect. It can contribute to improvement.

  As a result, this embodiment has an effect of obtaining a terminal structure of a vehicle-mounted wire harness having a high degree of corrosion prevention effect. Therefore, the electrical characteristics of the plurality of bare wire conductors 11 can be maintained with good stability.

  Further, the end exposed area of the caulking portion 1A is a non-plated area (fracture surface 1r) that is not a plating area 1m. As described above, the resin portion 20 causes the electrolyte to enter from the end exposed area. In addition, it is possible to reliably avoid the risk of finally eroding a part of the bare wire conductor.

  Therefore, it is not necessary to perform the plating process again even if the end exposed region of the caulking part 1A becomes a fractured surface 1r not subjected to the plating process due to the processing for obtaining the caulking part 1A from the terminal fitting 1 or the like. Therefore, the manufacturing cost of the terminal fitting 1 having the caulking portion 1A can be reduced.

  Further, as in the present embodiment, a combination of metals having a high possibility of erosion chain from the terminal fitting 1 made of brass or copper alloy to a plurality of bare wire conductors 11 made of aluminum is used. However, the resin part 20 can surely avoid the risk that the electrolyte enters from the end-exposed region and eventually a part of the bare wire conductor 11 is eroded.

  For this reason, the terminal structure of the wire harness excellent in usability can be obtained by using copper and aluminum more suitable for the terminal metal fitting 1 and the bare wire conductor 11.

(Other aspects)
FIG. 5 is an explanatory view schematically showing another aspect of the present embodiment. As shown in the figure, in another embodiment, the resin portion 21 is formed to extend on the fracture surface 1r of the other end 1s of the terminal fitting 1. In addition, the formation content of the other area | region of the resin part 21 is the same as that of the resin part 20 shown in FIGS. The structure other than the resin part 30 being replaced with the resin part 21 is the same as the structure of the present embodiment shown in FIGS.

  As shown in the figure, by forming the resin portion 21 also on the fracture surface 1r at the distal end portion 1s of the terminal fitting 1, the erosion of the bare wire conductor 11 accompanying the electrolyte intrusion from the fracture surface 1r of the distal end portion 1s. The effect of being able to avoid the problem with certainty is further exhibited.

  As described above, the terminal structure of the wire harness according to another aspect is provided with the resin portion 21 on all the fractured surfaces 1r (non-plated regions) in the terminal metal fitting 1 so that brass or copper which is a constituent material of the terminal metal fitting 1 is provided. There is an effect that it is possible to more reliably avoid the erosion of the bare wire conductor 11 due to the erosion of the alloy.

  Hereinafter, the present invention will be described in detail with reference to examples. In addition, this invention is not limited by these Examples.

1. Preparation of covered electric wire For 100 parts by mass of polyvinyl chloride (degree of polymerization 1300), 40 parts by mass of diisononyl phthalate as a plasticizer, 20 parts by mass of calcium bicarbonate as a filler, 5 parts by mass of calcium zinc-based stabilizer as a stabilizer A polyvinyl chloride composition was prepared by mixing at 180 ° C. with an open roll and molding into pellets with a pelletizer.

  Next, using a 50 mm extruder, the polyvinyl chloride composition obtained above was 0.28 mm around a conductor group (cross-sectional area 0.75 mm) made of an aluminum alloy twisted wire in which seven aluminum alloy wires were twisted together. Extrusion coated with thickness. This produced the covered electric wire (PVC electric wire).

2. Crimping of terminal metal fitting and formation of resin part After stripping the terminal of the coated wire produced above to expose the conductor group, a male male crimping terminal metal fitting (tab width 0.64 mm) widely used for automobiles The conductor group is crimped and crimped to the end of the coated electric wire).

  Next, from the caulking portion of the covering portion of the crimp terminal fitting to the caulking portion of the electric wire exposed portion and the conductor group, the following various resins are covered so as to cover the outer periphery of the end portion exposed region of the caulking portion of the covering portion and the vicinity thereof. A part forming material was applied to form a resin part. Various resin part forming materials were heated to 230 ° C. to form a liquid, applied with a thickness of 0.1 mm, and solidified.

Example 1
EVA (ethylene-vinyl acetate copolymer) [Mitsui DuPont Polychemical, Evaflex EV205W (comonomer 14 mass%, MFR800)]
(Example 2)
EEA (ethylene-ethyl acrylate copolymer) [manufactured by Nippon Unicar, NUC-6090 (comonomer 30% by mass, MFR 1250)]
(Example 3)
EMA <1> (ethylene-methyl acrylate copolymer) [manufactured by Mitsui DuPont Polychemical, Nucrel N2050H (comonomer 20% by mass, MFR500)]
Example 4
EMMA (ethylene-methyl methacrylate copolymer) [Sumitomo Chemical Co., Ltd., ACLIFT CM5021 (comonomer 28% by mass, MFR450)]
(Example 5)
Modified EMA (ethylene-methyl acrylate-maleic anhydride copolymer) [manufactured by Arkema, Bondine HX8210 (comonomer 10% by mass, MFR200)]
(Comparative Example 1)
EMA <2> (ethylene-methyl acrylate copolymer) [Nippon Polyethylene, Lexpearl EMA EB440H (comonomer 20% by mass, MFR18)]
(Comparative Example 2)
EAA (ethylene-acrylic acid copolymer) [manufactured by Mitsui DuPont Polychemical, Nucrel N1560 (comonomer 15% by mass, MFR60)]
(Comparative Example 3)
LDPE (low density polyethylene) [manufactured by Tosoh, Petrocene 354 (comonomer 0 mass%, MFR200)]

3. Evaluation Method Corrosion protection performance was evaluated as follows using a covered electric wire on which various resin portions were formed.

(Anti-corrosion performance)
As shown in FIG. 7, the prepared covered electric wire 100 with a terminal is connected to the positive electrode of the 12V power source 200, and a pure copper plate 300 (width 1 cm × length 2 cm × thickness 1 mm) is connected to the negative electrode of the 12V power source 200. The caulked portion between the conductor group of the attached covered electric wire 100 and the terminal fitting and the pure copper plate 300 were immersed in 300 cc of a 5% NaCl 5% aqueous solution 400 and energized at 12 V for 2 minutes. After energization, ICP emission analysis of NaCl 5% aqueous solution 400 was performed, and the elution amount of aluminum ions from the conductor group of covered electric wire 100 with a terminal was measured. The case where the elution amount was less than 0.1 ppm was designated as “◯”, and the case where the elution amount was 0.1 ppm or more was designated as “x”.

  Table 1 shows the types of resin part forming materials, MFR values, comonomer copolymerization ratios, and anticorrosion test results. In addition, MFR is a value in 190 degreeC and 21.18N measured based on JISK6922-1.

  According to Table 1, the following can be understood. That is, in Comparative Examples 1 and 2, since the MFR of the ethylene-α olefin copolymer of the resin part forming material is relatively small, the fluidity is poor and the exposed bare wire conductor and the crimped part of the terminal fitting are covered. Could not be applied. Therefore, it was inferior to corrosion resistance. In Comparative Example 3, the resin part forming material is made of low-density polyethylene, so that the wettability or adhesion to the metal surface is poor. Therefore, it was inferior to corrosion resistance.

  On the other hand, it has confirmed that the Example was excellent in corrosion resistance. Moreover, since the resin part formation material contains the ethylene-alpha olefin copolymer, it has also confirmed that there was no stickiness.

  Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 Terminal metal fitting 1A, 1B Caulking part 1e Root edge part 1m Plating area 1r Broken surface 10 Covered electric wire 11 Bare wire conductor 12 Conductor group 13 Covering part 20, 21, 30 Resin part

Claims (4)

It is a terminal structure of an in-vehicle wire harness,
It is provided with a covered electric wire formed by covering a plurality of bare wire conductors with a covering portion, and the plurality of bare wire conductors have an exposed wire exposed portion at a terminal,
A terminal fitting fixed to the covered electric wire is further provided, and the terminal fitting is fixed to the covered electric wire by caulking at one end thereof along an outer periphery of the covered portion of the covered electric wire in the vicinity of the exposed portion of the electric wire. Having a caulking portion,
A resin portion formed to cover at least the entire outer periphery of the end exposed region of the caulking portion and the vicinity thereof;
The resin part is
The melt flow rate at 190 ° C. and 21.18 N measured according to JIS K6922-1 is 200 g / 10 min. The terminal of the wire harness characterized by being formed from the material which contains the above ethylene-alpha olefin copolymer, and the copolymerization ratio of the alpha olefin in the said ethylene-alpha olefin copolymer is 10 mass% or more. Construction.   2. The wire harness according to claim 1, wherein the α-olefin is one or more selected from vinyl esters, α, β-unsaturated carboxylic acid alkyl esters, and carboxyl group-containing monomers. Terminal structure. The terminal fitting has a plating area whose surface is plated,
The terminal structure of the wire harness according to claim 1, wherein the end exposed region of the caulking portion includes a non-plated region that is not subjected to plating. The constituent material of the plurality of bare wire conductors includes aluminum,
The constituent material of the terminal fitting includes copper,
The terminal structure of the wire harness according to any one of claims 1 to 3, wherein the plating material in the plating region contains tin.

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