JP2024068734A

JP2024068734A - Wire with terminal

Info

Publication number: JP2024068734A
Application number: JP2022179291A
Authority: JP
Inventors: 隼豊泉
Original assignee: Yazaki Corp
Current assignee: Yazaki Corp
Priority date: 2022-11-09
Filing date: 2022-11-09
Publication date: 2024-05-21

Abstract

【課題】適正な導通性能を確保することができる端子付き電線を提供することを目的とする。【解決手段】端子付き電線１００は、絶縁性を有する絶縁被覆部Ｗ２で導電性を有する導体部Ｗ１を被覆した電線Ｗと、相手部材Ｔと電気的に接続される電気接続部２、絶縁被覆部Ｗ２の端末から露出する導体部Ｗ１に対して圧着される導体圧着部４６、及び、絶縁被覆部Ｗ２に対して圧着される被覆圧着部４８を含む圧着端子１と、を備え、圧着端子１は、母材１０によって電気接続部２、導体圧着部４６、及び、被覆圧着部４８が一体で形成され、少なくとも導体圧着部４６の内面にメッキ１１が施され、メッキ１１は、導体部Ｗ１と当接する表面１２ａに凹凸部分１５が設けられた外層１２と、外層１２と母材１０との間に介在される内層１３と、を含み、外層１２の表面１２ａの算術平均高さＳａは、０．５μｍ以上１００μｍ以下であることを特徴とする。【選択図】図４An object of the present invention is to provide an electric wire with a terminal capable of ensuring appropriate electrical conductivity. [Solution] The electric wire with terminal 100 includes an electric wire W in which a conductive conductor portion W1 is covered with an insulating covering portion W2 having insulation properties, and a crimp terminal 1 including an electrical connection portion 2 electrically connected to a mating member T, a conductor crimping portion 46 crimped to the conductor portion W1 exposed from the end of the insulating covering portion W2, and a covering crimping portion 48 crimped to the insulating covering portion W2, the crimp terminal 1 being characterized in that the electrical connection portion 2, the conductor crimping portion 46, and the covering crimping portion 48 are integrally formed by a base material 10, at least the inner surface of the conductor crimping portion 46 is plated with a plating 11, the plating 11 including an outer layer 12 having an uneven portion 15 on a surface 12a that contacts the conductor portion W1, and an inner layer 13 interposed between the outer layer 12 and the base material 10, the arithmetic mean height Sa of the surface 12a of the outer layer 12 being 0.5 μm or more and 100 μm or less. [Selected Figure] Figure 4

Description

本発明は、端子付き電線に関する。 The present invention relates to an electric wire with a terminal.

従来の端子付き電線に関する技術として、例えば、特許文献１には、電線と、電線の導体部に対して圧着される導体圧着部に微小凹凸が設けられた圧着端子と、を備えた端子付き電線が開示されている。この特許文献１では、プレス加工によって導体圧着部に微小凹凸が形成され、その後、導体圧着部における微小凹凸の表面にアルミニウム系金属の薄膜表面層が施されている。 As an example of a conventional technology relating to electric wires with terminals, Patent Document 1 discloses an electric wire with terminals that includes an electric wire and a crimp terminal in which minute projections and recesses are provided on the conductor crimping portion that is crimped to the conductor portion of the electric wire. In Patent Document 1, minute projections and recesses are formed on the conductor crimping portion by pressing, and then a thin film surface layer of an aluminum-based metal is applied to the surface of the minute projections and recesses in the conductor crimping portion.

特開２０１７－３３７７６号公報JP 2017-33776 A

ところで、上述の特許文献１に記載の端子付き電線は、例えば、より適正な導通性能の確保の点で更なる改善の余地がある。 However, the terminal-attached electric wire described in the above-mentioned Patent Document 1 has room for further improvement, for example, in terms of ensuring more appropriate electrical conductivity.

本発明は、上記の事情に鑑みてなされたものであって、適正な導通性能を確保することができる端子付き電線を提供することを目的とする。 The present invention was made in consideration of the above circumstances, and aims to provide an electric wire with a terminal that can ensure proper electrical conductivity.

上記目的を達成するために、本発明に係る端子付き電線は、絶縁性を有する絶縁被覆部で導電性を有する導体部を被覆した電線と、相手部材と電気的に接続される電気接続部、前記絶縁被覆部の端末から露出する前記導体部に対して圧着される導体圧着部、及び、前記絶縁被覆部に対して圧着される被覆圧着部を含む圧着端子と、を備え、前記圧着端子は、母材によって前記電気接続部、前記導体圧着部、及び、前記被覆圧着部が一体で形成され、少なくとも前記導体圧着部の内面にメッキが施され、前記メッキは、前記導体部と当接する表面に凹凸部分が設けられた外層と、前記外層と前記母材との間に介在される内層と、を含み、前記外層の前記表面の算術平均高さＳａは、０．５μｍ以上１００μｍ以下であることを特徴とする。 In order to achieve the above object, the electric wire with terminal according to the present invention comprises an electric wire in which a conductive conductor part is covered with an insulating covering part having insulation properties, an electrical connection part electrically connected to a mating member, a conductor crimping part crimped to the conductor part exposed from the end of the insulating covering part, and a crimp terminal including a covering crimping part crimped to the insulating covering part, the crimp terminal being formed integrally with the electrical connection part, the conductor crimping part, and the covering crimping part by a base material, at least the inner surface of the conductor crimping part is plated, the plating includes an outer layer having an uneven part on the surface that contacts the conductor part, and an inner layer interposed between the outer layer and the base material, and the arithmetic mean height Sa of the surface of the outer layer is 0.5 μm or more and 100 μm or less.

本発明に係る端子付き電線は、導体圧着部が導体部に圧着され、被覆圧着部が絶縁被覆部に圧着されることで、圧着端子が電線の端末に圧着される。そして、端子付き電線は、圧着端子の電気接続部に相手部材が電気的に接続される。このような構成において、圧着端子は、母材によって電気接続部、導体圧着部、及び、被覆圧着部が一体で形成され、少なくとも導体圧着部の内面にメッキが施される。そして、メッキは、導体部と当接する表面に凹凸部分が設けられた外層と、外層と母材との間に介在される内層と、を含み、外層の表面の算術平均高さＳａは、０．５μｍ以上１００μｍ以下である。このため、圧着端子は、０．５μｍ以上１００μｍ以下に設定された外層の表面の凹凸部分で電線側の導体部の表面に設けられうる酸化被膜を少なくとも部分的に破壊し易くすることができる。この結果、端子付き電線は、適正な導通性能を確保することができる、という効果を奏する。 In the electric wire with terminal according to the present invention, the conductor crimping portion is crimped to the conductor portion, and the covering crimping portion is crimped to the insulating covering portion, so that the crimp terminal is crimped to the end of the electric wire. In the electric wire with terminal, the electrical connection portion of the crimp terminal is electrically connected to the mating member. In this configuration, the crimp terminal has an electrical connection portion, a conductor crimping portion, and a covering crimping portion integrally formed by the base material, and at least the inner surface of the conductor crimping portion is plated. The plating includes an outer layer having an uneven portion on the surface that contacts the conductor portion, and an inner layer interposed between the outer layer and the base material, and the arithmetic mean height Sa of the outer layer is 0.5 μm or more and 100 μm or less. Therefore, the crimp terminal can easily at least partially destroy the oxide coating that may be provided on the surface of the conductor portion on the electric wire side at the uneven portion of the surface of the outer layer set to 0.5 μm or more and 100 μm or less. As a result, the electric wire with terminal has the effect of ensuring appropriate conductive performance.

図１は、実施形態に係る端子付き電線の例示的な斜視図である。FIG. 1 is an exemplary perspective view of an electric wire with a terminal according to an embodiment. 図２は、実施形態に係る端子付き電線の例示的な分解斜視図である。FIG. 2 is an exemplary exploded perspective view of an electric wire with a terminal according to an embodiment. 図３は、実施形態に係る端子付き電線の導体圧着部の例示的な断面図である。FIG. 3 is an exemplary cross-sectional view of a conductor crimping portion of an electric wire with a terminal according to an embodiment. 図４は、実施形態に係る端子付き電線の導体圧着部及び導体部の例示的な断面図である。FIG. 4 is an exemplary cross-sectional view of a conductor crimping portion and a conductor portion of an electric wire with a terminal according to an embodiment. 図５は、実施形態に係る端子付き電線の評価結果を説明する例示的な表である。FIG. 5 is an exemplary table illustrating the evaluation results of the electric wire with terminal according to the embodiment.

以下に、本発明に係る実施形態を図面に基づいて詳細に説明する。なお、この実施形態によりこの発明が限定されるものではない。また、下記実施形態における構成要素には、当業者が置換可能かつ容易なもの、あるいは実質的に同一のものが含まれる。 Below, an embodiment of the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to this embodiment. Furthermore, the components in the following embodiment include those that are easily replaceable by a person skilled in the art, or those that are substantially the same.

［実施形態］
図１は、実施形態に係る端子付き電線１００の斜視図であり、図２は、端子付き電線１００の分解斜視図である。図１、図２に示される本実施形態に係る端子付き電線１００は、車両に使用されるワイヤハーネス等に適用されるものである。ここで、ワイヤハーネスは、例えば、車両に搭載される各装置間の接続のために、電源供給や信号通信に用いられる複数の電線Ｗを束にして集合部品とし、コネクタ等で複数の電線Ｗを各装置に接続するようにしたものである。 [Embodiment]
Fig. 1 is a perspective view of an electric wire with terminal 100 according to an embodiment, and Fig. 2 is an exploded perspective view of the electric wire with terminal 100. The electric wire with terminal 100 according to the embodiment shown in Fig. 1 and Fig. 2 is applied to a wire harness or the like used in a vehicle. Here, the wire harness is, for example, a collective component in which a plurality of electric wires W used for power supply and signal communication are bundled together to connect each device mounted on a vehicle, and the plurality of electric wires W are connected to each device by a connector or the like.

本実施形態の端子付き電線１００は、電線Ｗと、当該電線Ｗの端末に圧着された圧着端子１と、を備える。そして、本実施形態の端子付き電線１００は、圧着端子１を構成する母材１０の内面１０ａにメッキ１１を施すと共に、当該メッキ１１の膜形成を工夫することにより、適正な導通性能の確保を図ったものである。以下、各図を参照して端子付き電線１００の各構成について詳細に説明する。 The electric wire with terminal 100 of this embodiment includes an electric wire W and a crimp terminal 1 crimped to the end of the electric wire W. The electric wire with terminal 100 of this embodiment is provided with plating 11 on the inner surface 10a of the base material 10 constituting the crimp terminal 1, and the film formation of the plating 11 is devised to ensure proper electrical conductivity. Each component of the electric wire with terminal 100 will be described in detail below with reference to the respective figures.

なお、以下の説明では、互いに交差する第１方向、第２方向、及び、第３方向のうち、第１方向を「軸線方向Ｘ」といい、第２方向を「幅方向Ｙ」といい、第３方向を「高さ方向Ｚ」という。ここでは、軸線方向Ｘと幅方向Ｙと高さ方向Ｚとは、相互に略直交する。軸線方向Ｘは、典型的には、圧着端子１が設けられる電線Ｗの軸線Ｃに沿う方向、当該電線Ｗが延在する延在方向、圧着端子１と相手部材Ｔとの挿抜方向等に相当する。幅方向Ｙと高さ方向Ｚとは、軸線方向Ｘと交差する交差方向に相当する。また、以下の説明で用いる各方向は、特に断りのない限り、各部が相互に組み付けられた状態での方向を表すものとする。 In the following description, the first direction, the second direction, and the third direction intersect with each other, and the first direction is referred to as the "axial direction X", the second direction is referred to as the "width direction Y", and the third direction is referred to as the "height direction Z". Here, the axial direction X, the width direction Y, and the height direction Z are approximately perpendicular to each other. The axial direction X typically corresponds to the direction along the axis C of the electric wire W on which the crimp terminal 1 is provided, the extension direction in which the electric wire W extends, the insertion/removal direction between the crimp terminal 1 and the mating member T, etc. The width direction Y and the height direction Z correspond to the intersecting direction that intersects with the axial direction X. Furthermore, unless otherwise specified, each direction used in the following description refers to the direction in which each part is assembled to each other.

電線Ｗは、例えば、導電性を有する線状の導体部Ｗ１と、当該導体部Ｗ１の外側を覆う絶縁性を有する絶縁被覆部Ｗ２と、を含んで構成される。電線Ｗは、絶縁被覆部Ｗ２で導体部Ｗ１を被覆した絶縁電線である。本実施形態の導体部Ｗ１は、導電性を有する金属素線を複数束ねた芯線であるが、当該複数の金属素線を撚り合わせた撚り芯線であってもよい。 The electric wire W is composed of, for example, a linear conductor portion W1 having electrical conductivity and an insulating coating portion W2 having electrical insulation that covers the outside of the conductor portion W1. The electric wire W is an insulated electric wire in which the conductor portion W1 is coated with the insulating coating portion W2. The conductor portion W1 in this embodiment is a core wire in which multiple conductive metal wires are bundled together, but it may also be a twisted core wire in which the multiple metal wires are twisted together.

絶縁被覆部Ｗ２は、導体部Ｗ１の外周側を被覆する電線被覆である。絶縁被覆部Ｗ２は、例えば、絶縁性の樹脂材料（ＰＰやＰＶＣ、架橋ＰＥ等。耐摩耗性や耐薬品性、耐熱性等に配慮して適宜選定される。）等を押出成形することによって形成される。電線Ｗは、軸線Ｃに沿って線状に延在し、延在方向（軸線方向Ｘ）に対してほぼ同じ径で延びるように形成される。 The insulating coating part W2 is a wire coating that covers the outer periphery of the conductor part W1. The insulating coating part W2 is formed, for example, by extrusion molding an insulating resin material (such as PP, PVC, cross-linked PE, etc., appropriately selected taking into consideration abrasion resistance, chemical resistance, heat resistance, etc.). The wire W is formed to extend linearly along the axis C and to extend with approximately the same diameter in the extension direction (axial direction X).

また、電線Ｗは、導体部Ｗ１の断面形状（軸線方向Ｘと交差する方向の断面形状）が略円形状、絶縁被覆部Ｗ２の断面形状が略円環形状となっており、全体として略円形状の断面形状となっている。電線Ｗは、少なくとも導体部Ｗ１の一方の端末において、絶縁被覆部Ｗ２が剥ぎ取られており、当該導体部Ｗ１の一方の端末が絶縁被覆部Ｗ２から露出し、当該露出している導体部Ｗ１の端末に圧着端子１が設けられる。 The electric wire W has a substantially circular cross-sectional shape (cross-sectional shape in a direction intersecting with the axial direction X) of the conductor portion W1 and a substantially annular cross-sectional shape of the insulating coating portion W2, so that the electric wire W has a substantially circular cross-sectional shape overall. At least one end of the conductor portion W1 of the electric wire W has the insulating coating portion W2 stripped off, so that one end of the conductor portion W1 is exposed from the insulating coating portion W2, and a crimp terminal 1 is provided on the exposed end of the conductor portion W1.

圧着端子１は、電線Ｗが電気的に接続され、導電性を有する相手部材Ｔが接続される端子金具である。圧着端子１は、電気接続部２と、連結部３と、電線圧着部４と、を有する。電気接続部２と連結部３と電線圧着部４とは、全体が一体で導電性を有する金属部材によって構成される。 The crimp terminal 1 is a terminal fitting to which an electric wire W is electrically connected and to which a conductive mating member T is connected. The crimp terminal 1 has an electrical connection portion 2, a connecting portion 3, and an electric wire crimping portion 4. The electrical connection portion 2, the connecting portion 3, and the electric wire crimping portion 4 are all integrally formed of a conductive metal member.

具体的には、圧着端子１は、一枚の板金を、電気接続部２、連結部３、電線圧着部４等の各部に対応した形状にあわせて打ち抜き加工、プレス加工、折り曲げ加工等の各種加工によって成形することで各部が立体的に一体で形成される。圧着端子１は、軸線方向Ｘに沿って一方側から他方側に向かって、電気接続部２、連結部３、電線圧着部４の順で並んで相互に連結される。 Specifically, the crimp terminal 1 is formed by forming a single sheet metal into a shape corresponding to each part, such as the electrical connection part 2, the connecting part 3, and the electric wire crimping part 4, by various processes such as punching, pressing, and bending, so that each part is three-dimensionally and integrally formed. The crimp terminal 1 is connected to each other in the order of the electrical connection part 2, the connecting part 3, and the electric wire crimping part 4, lined up from one side to the other along the axial direction X.

電気接続部２は、相手部材Ｔ（図１参照）と電気的に接続される部分である。本実施形態の相手部材Ｔは、例えば、相手側端子である。すなわち、本実施形態の電気接続部２は、相手部材Ｔである相手側端子に対して電気的に接続される端子接続部として構成される。電気接続部２は、雄型の端子形状であってもよいし、雌型の端子形状であってもよい。 The electrical connection portion 2 is a portion that is electrically connected to a mating member T (see FIG. 1). In this embodiment, the mating member T is, for example, a mating terminal. That is, the electrical connection portion 2 in this embodiment is configured as a terminal connection portion that is electrically connected to the mating terminal that is the mating member T. The electrical connection portion 2 may be in the shape of a male terminal or a female terminal.

本実施形態では、電気接続部２は、雌型の端子形状として図示しており、雄型の端子形状の相手部材Ｔと電気的に接続される。なお、相手部材Ｔは、相手側端子でなくてもよく、例えば、アース部材等の種々の導電性の部材であってもよい。この場合、電気接続部２は、例えば、相手部材であるアース部材等に締結されるいわゆる丸形端子（ＬＡ端子）形状であってもよい。 In this embodiment, the electrical connection portion 2 is illustrated as having a female terminal shape, and is electrically connected to a mating member T having a male terminal shape. Note that the mating member T does not have to be a mating terminal, and may be, for example, various conductive members such as an earth member. In this case, the electrical connection portion 2 may be, for example, in the shape of a so-called round terminal (LA terminal) that is fastened to the mating member such as an earth member.

連結部３は、電気接続部２と電線圧着部４との間に介在し、当該電気接続部２と電線圧着部４とを連結する部分である。圧着端子１は、電気接続部２と電線圧着部４とが連結部３を介して電気的に接続され、電線圧着部４を介して電気接続部２と電線Ｗの導体部Ｗ１とが電気的に接続され導通される。 The connecting portion 3 is interposed between the electrical connection portion 2 and the electric wire crimping portion 4, and is a portion that connects the electrical connection portion 2 and the electric wire crimping portion 4. In the crimp terminal 1, the electrical connection portion 2 and the electric wire crimping portion 4 are electrically connected via the connecting portion 3, and the electrical connection portion 2 and the conductor portion W1 of the electric wire W are electrically connected and conductive via the electric wire crimping portion 4.

電線圧着部４は、電線Ｗが接続され、当該電線Ｗの端末と圧着端子１とを電気的に接続する部分である。電線圧着部４は、電線Ｗの端末に加締められ圧着される。電線圧着部４は、基部４１、及び、二組の一対のバレル片部４２、４３、４４、４５を含んで構成される。電線圧着部４は、基部４１と二組の一対のバレル片部４２、４３、４４、４５とによって電線Ｗに対して加締められ圧着される。 The electric wire crimping portion 4 is a portion to which the electric wire W is connected and electrically connects the end of the electric wire W with the crimp terminal 1. The electric wire crimping portion 4 is crimped and crimped to the end of the electric wire W. The electric wire crimping portion 4 is composed of a base portion 41 and two pairs of barrel pieces 42, 43, 44, 45. The electric wire crimping portion 4 is crimped and crimped to the electric wire W by the base portion 41 and the two pairs of barrel pieces 42, 43, 44, 45.

さらに言えば、電線圧着部４は、基部４１、及び、二組の一対のバレル片部４２、４３、４４、４５によって、導体圧着部４６、中間部４７、及び、被覆圧着部４８が構成される。言い換えれば、電線圧着部４は、基部４１、及び、二組の一対のバレル片部４２、４３、４４、４５によって構成される導体圧着部４６、中間部４７、及び、被覆圧着部４８を含んで構成される。 More specifically, the wire crimping portion 4 includes a conductor crimping portion 46, an intermediate portion 47, and a coating crimping portion 48, which are formed by the base portion 41 and two pairs of barrel pieces 42, 43, 44, and 45. In other words, the wire crimping portion 4 includes a conductor crimping portion 46, an intermediate portion 47, and a coating crimping portion 48, which are formed by the base portion 41 and two pairs of barrel pieces 42, 43, 44, and 45.

導体圧着部４６は、基部４１の一部、及び、一対のバレル片部４２、４３によって構成される。中間部４７は、基部４１の一部によって構成される。被覆圧着部４８は、基部４１の一部、及び、一対のバレル片部４４、４５によって構成される。電線圧着部４は、軸線方向Ｘに沿って電気接続部２側から反対側に向かって、導体圧着部４６、中間部４７、被覆圧着部４８の順で並んで相互に連結される。 The conductor crimping portion 46 is composed of a portion of the base 41 and a pair of barrel pieces 42, 43. The intermediate portion 47 is composed of a portion of the base 41. The insulation crimping portion 48 is composed of a portion of the base 41 and a pair of barrel pieces 44, 45. The wire crimping portion 4 is connected to each other in the axial direction X in the order of the conductor crimping portion 46, intermediate portion 47, and insulation crimping portion 48 from the electrical connection portion 2 side to the opposite side.

そして、本実施形態の電線圧着部４は、中間部４７を介して一対のバレル片部４２、４３と一対のバレル片部４４、４５とが分断されたいわゆる別体バレル型の圧着部を構成する。具体的には、基部４１は、軸線方向Ｘに沿って延在し、圧着端子１の圧着前の状態（図２参照）において、略Ｕ字状に形成された電線圧着部４の底壁となる部分である。基部４１は、板厚方向が高さ方向Ｚに沿う板状に形成される。基部４１は、圧着加工の際に電線Ｗの端部が載置される。基部４１は、軸線方向Ｘの一方側に連結部３を介して電気接続部２が連結される。 The electric wire crimping portion 4 of this embodiment constitutes a so-called separate barrel type crimping portion in which a pair of barrel pieces 42, 43 and a pair of barrel pieces 44, 45 are separated via an intermediate portion 47. Specifically, the base portion 41 extends along the axial direction X, and is the portion that becomes the bottom wall of the electric wire crimping portion 4 that is formed in a substantially U-shape before the crimp terminal 1 is crimped (see FIG. 2). The base portion 41 is formed in a plate shape whose plate thickness direction is along the height direction Z. The end of the electric wire W is placed on the base portion 41 during crimping. The electric connection portion 2 is connected to one side of the base portion 41 in the axial direction X via the connecting portion 3.

また、基部４１は、各部において幅方向Ｙの両端部が高さ方向Ｚに沿って立ち上がっている（図２参照）。基部４１は、軸線方向Ｘに沿って、導体圧着部４６、中間部４７、及び、被覆圧着部４８に渡って連続する。基部４１は、軸線方向Ｘの一方の端部に電気接続部２が連結される。また、基部４１は、圧着加工前の状態において、軸線方向Ｘの他方の端部にキャリアが連結されており、例えば、圧着加工時にキャリアから切断される。 In addition, both ends of the base 41 in the width direction Y rise up along the height direction Z (see FIG. 2). The base 41 is continuous along the axial direction X across the conductor crimping section 46, the intermediate section 47, and the coating crimping section 48. The electrical connection section 2 is connected to one end of the base 41 in the axial direction X. In addition, before crimping, the base 41 has a carrier connected to the other end in the axial direction X, and is cut off from the carrier during crimping, for example.

一対のバレル片部４２、４３は、基部４１の一部と共に導体圧着部４６を構成する部分である。導体圧着部４６は、電線圧着部４において軸線方向Ｘの一端側、ここでは、電気接続部２側に設けられ電線Ｗの導体部Ｗ１に対して加締められ圧着される部分である。さらに言えば、導体圧着部４６は、導体部Ｗ１に対して加締められ圧着されることで、当該導体部Ｗ１と電気的に接続される部分である。 The pair of barrel pieces 42, 43, together with a part of the base 41, constitute the conductor crimping portion 46. The conductor crimping portion 46 is provided on one end side of the electric wire crimping portion 4 in the axial direction X, here on the electrical connection portion 2 side, and is crimped and attached to the conductor portion W1 of the electric wire W. More specifically, the conductor crimping portion 46 is crimped and crimped to the conductor portion W1, thereby being electrically connected to the conductor portion W1.

一対のバレル片部４２、４３は、導体圧着部４６において基部４１から幅方向Ｙの両側にそれぞれ帯状に延びて形成され、基部４１との間に電線Ｗの導体部Ｗ１を包んで加締められ圧着される部分である。バレル片部４２、４３は、圧着加工前の状態において、Ｕ字状に形成された電線圧着部４の側壁となる部分である。バレル片部４２は、基部４１から幅方向Ｙの一方側に延び、バレル片部４３は、基部４１から幅方向Ｙの他方側に延びる。バレル片部４２、４３は、電線Ｗの導体部Ｗ１に対して加締められ圧着される前の状態（図２参照）では、基部４１に対して曲げ加工が施され当該基部４１とあわせて略Ｕ字状に成形されている。 The pair of barrel pieces 42, 43 are formed in the conductor crimping portion 46, extending from the base 41 on both sides in the width direction Y, and are portions that are crimped and crimped by wrapping the conductor portion W1 of the electric wire W between the base 41 and the barrel pieces 42, 43. Before the crimping process, the barrel pieces 42, 43 are the side walls of the electric wire crimping portion 4, which is formed in a U-shape. The barrel piece 42 extends from the base 41 to one side in the width direction Y, and the barrel piece 43 extends from the base 41 to the other side in the width direction Y. Before the barrel pieces 42, 43 are crimped and crimped to the conductor portion W1 of the electric wire W (see FIG. 2), the barrel pieces 42, 43 are bent relative to the base 41 and formed into an approximately U-shape together with the base 41.

本実施形態の一対のバレル片部４２、４３は、導体部Ｗ１に対して巻き付けられて加締められ、圧着された状態で、互いに重なり合わない（オーバーラップしない）ように基部４１側の根元から先端までの長さが設定されている。導体圧着部４６は、基部４１、及び、一対のバレル片部４２、４３によって、一対のバレル片部４２、４３の間に配置された電線Ｗの導体部Ｗ１の外側を包んで導体部Ｗ１に対して加締められ圧着される。ここでは、一対のバレル片部４２、４３は、いわゆるＢクリンプと称する加締め圧着がなされるものとして図示している。 In this embodiment, the pair of barrel pieces 42, 43 are wrapped around the conductor portion W1, and the length from the base 41 to the tip is set so that they do not overlap when crimped. The conductor crimping portion 46 wraps around the outside of the conductor portion W1 of the electric wire W arranged between the pair of barrel pieces 42, 43 by the base 41 and the pair of barrel pieces 42, 43, and is crimped and crimped to the conductor portion W1. Here, the pair of barrel pieces 42, 43 are illustrated as being crimped and crimped in a manner known as a B crimp.

導体圧着部４６は、Ｂクリンプでは、基部４１と一対のバレル片部４２、４３とによって導体部Ｗ１を包んで圧着された状態で、バレル片部４２、４３のそれぞれが基部４１側に向けて折り曲げられた状態とされる。そして、導体圧着部４６は、この状態で当該一対のバレル片部４２、４３の先端がそれぞれ導体部Ｗ１に接触して押しつけられるように加締められ圧着される。 In the B crimp, the conductor crimping portion 46 is crimped by wrapping the conductor portion W1 between the base 41 and the pair of barrel pieces 42, 43, with each of the barrel pieces 42, 43 bent toward the base 41. In this state, the conductor crimping portion 46 is crimped by tightening the tips of the pair of barrel pieces 42, 43 so that they are in contact with and pressed against the conductor portion W1.

一対のバレル片部４４、４５は、基部４１の一部と共に被覆圧着部４８を構成する部分である。被覆圧着部４８は、電線圧着部４において軸線方向Ｘの他端側、ここでは、電気接続部２側とは反対側に設けられ電線Ｗの絶縁被覆部Ｗ２に対して加締められ圧着される部分である。 The pair of barrel pieces 44, 45, together with a part of the base 41, constitute the insulation crimping portion 48. The insulation crimping portion 48 is provided on the other end side of the electric wire crimping portion 4 in the axial direction X, in this case, on the side opposite the electrical connection portion 2, and is crimped and crimped to the insulating coating portion W2 of the electric wire W.

一対のバレル片部４４、４５は、被覆圧着部４８において基部４１から幅方向Ｙの両側にそれぞれ帯状に延びて形成され、基部４１との間に電線Ｗの絶縁被覆部Ｗ２を包んで加締められ圧着される部分である。バレル片部４４、４５は、圧着加工前の状態において、Ｕ字状に形成された電線圧着部４の側壁となる部分である。バレル片部４４は、基部４１から幅方向Ｙの一方側に延び、バレル片部４５は、基部４１から幅方向Ｙの他方側に延びる。バレル片部４４、４５は、電線Ｗの絶縁被覆部Ｗ２に対して加締められ圧着される前の状態（図２参照）では、基部４１に対して曲げ加工が施され当該基部４１とあわせて略Ｕ字状に成形されている。 The pair of barrel pieces 44, 45 are formed in the covering crimping portion 48, extending from the base 41 on both sides in the width direction Y, and are portions that are crimped and crimped by wrapping the insulating covering portion W2 of the electric wire W between the base 41 and the barrel pieces 44, 45. The barrel pieces 44, 45 are portions that become the side walls of the electric wire crimping portion 4 that is formed in a U-shape before crimping. The barrel piece 44 extends from the base 41 to one side in the width direction Y, and the barrel piece 45 extends from the base 41 to the other side in the width direction Y. Before being crimped and crimped to the insulating covering portion W2 of the electric wire W (see FIG. 2), the barrel pieces 44, 45 are bent relative to the base 41 and formed into an approximately U-shape together with the base 41.

本実施形態の一対のバレル片部４４、４５は、絶縁被覆部Ｗ２に対して巻き付けられて加締められ、圧着された状態で、互いに重なり合わない（オーバーラップしない）ように基部４１側の根元から先端までの長さが設定され、かつ、軸線方向Ｘにずらされて形成される。被覆圧着部４８は、基部４１、及び、一対のバレル片部４４、４５によって、一対のバレル片部４４、４５の間に配置された電線Ｗの絶縁被覆部Ｗ２の外側を包んで絶縁被覆部Ｗ２に対して加締められ圧着される。 In this embodiment, the pair of barrel pieces 44, 45 are wrapped around the insulating coating portion W2, crimped, and formed with a length from the base to the tip on the base 41 side so that they do not overlap each other when in a crimped state, and are formed with a shift in the axial direction X. The coating crimping portion 48 is crimped and crimped to the insulating coating portion W2 by the base 41 and the pair of barrel pieces 44, 45, wrapping the outside of the insulating coating portion W2 of the electric wire W arranged between the pair of barrel pieces 44, 45.

電線圧着部４は、軸線方向Ｘに対して被覆圧着部４８と導体圧着部４６との間に中間部４７が介在する。中間部４７は、導体圧着部４６と被覆圧着部４８との間に介在し、当該導体圧着部４６と被覆圧着部４８とを連結する部分である。中間部４７は、基部４１によって構成され、当該基部４１の軸線方向Ｘの一方側の端部に導体圧着部４６が連結され、他方側の端部に被覆圧着部４８が連結される。そして、中間部４７は、導体部Ｗ１の一部が露出する部分を構成する。上述したように、バレル片部４２、４３とバレル片部４４、４５とは、それぞれ、互いの間に当該中間部４７が介在することで相互に間隔をあけて分断して形成される。 The wire crimping portion 4 has an intermediate portion 47 interposed between the coating crimping portion 48 and the conductor crimping portion 46 in the axial direction X. The intermediate portion 47 is interposed between the conductor crimping portion 46 and the coating crimping portion 48, and is a portion that connects the conductor crimping portion 46 and the coating crimping portion 48. The intermediate portion 47 is formed by the base portion 41, and the conductor crimping portion 46 is connected to one end of the base portion 41 in the axial direction X, and the coating crimping portion 48 is connected to the other end. The intermediate portion 47 constitutes a portion where a part of the conductor portion W1 is exposed. As described above, the barrel pieces 42, 43 and the barrel pieces 44, 45 are separated from each other by the intermediate portion 47 interposed between them, and are formed at a distance from each other.

上記のように構成された端子付き電線１００は、導体圧着部４６が導体部Ｗ１に圧着され、被覆圧着部４８が絶縁被覆部Ｗ２に圧着されることで、圧着端子１が電線Ｗの端末に圧着される。そして、端子付き電線１００は、圧着端子１の電気接続部２に相手部材Ｔが電気的に接続される。 In the electric wire with terminal 100 configured as described above, the conductor crimping portion 46 is crimped to the conductor portion W1, and the coating crimping portion 48 is crimped to the insulating coating portion W2, so that the crimp terminal 1 is crimped to the end of the electric wire W. Then, in the electric wire with terminal 100, the mating member T is electrically connected to the electrical connection portion 2 of the crimp terminal 1.

そして、本実施形態の圧着端子１は、上記のような構成にあって、導電性を有する金属部材である母材１０によって電気接続部２、連結部３、及び、電線圧着部４が一体で形成される。電線圧着部４は、上述したように、導体圧着部４６、中間部４７、及び、被覆圧着部４８を含み、電線圧着部４においてはこれら導体圧着部４６、中間部４７、及び、被覆圧着部４８が母材１０によって一体で形成される。そして、圧着端子１は、例えば、母材１０の導体圧着部４６、中間部４７、被覆圧着部４８、及び、連結部３の内面１０ａにメッキ１１が施されている。 The crimp terminal 1 of this embodiment has the above-mentioned configuration, and the electrical connection portion 2, the connecting portion 3, and the electric wire crimping portion 4 are integrally formed by the base material 10, which is a metal member having electrical conductivity. As described above, the electric wire crimping portion 4 includes the conductor crimping portion 46, the intermediate portion 47, and the coating crimping portion 48, and in the electric wire crimping portion 4, the conductor crimping portion 46, the intermediate portion 47, and the coating crimping portion 48 are integrally formed by the base material 10. In the crimp terminal 1, for example, plating 11 is applied to the conductor crimping portion 46, the intermediate portion 47, the coating crimping portion 48, and the inner surface 10a of the connecting portion 3 of the base material 10.

図３は、実施形態に係る端子付き電線１００の導体圧着部４６の断面図であり、図４は、端子付き電線１００の導体圧着部４６及び導体部Ｗ１の断面図である。図３、図４に示されるように、本実施形態に係るメッキ１１は、例えば、外層１２と、内層１３と、を含む多層構造を有している。外層１２は、メッキ１１のうち電線Ｗの導体部Ｗ１と当接する表面層を構成し、内層１３は、外層１２と母材１０との間に介在される中間層を構成している。 Figure 3 is a cross-sectional view of the conductor crimping portion 46 of the electric wire with terminal 100 according to the embodiment, and Figure 4 is a cross-sectional view of the conductor crimping portion 46 and the conductor portion W1 of the electric wire with terminal 100. As shown in Figures 3 and 4, the plating 11 according to the present embodiment has a multi-layer structure including, for example, an outer layer 12 and an inner layer 13. The outer layer 12 constitutes a surface layer of the plating 11 that abuts against the conductor portion W1 of the electric wire W, and the inner layer 13 constitutes an intermediate layer interposed between the outer layer 12 and the base material 10.

ここで、本実施形態の電線Ｗにおいて、導体部Ｗ１は、アルミニウム（Ａｌ）又はアルミニウム合金によって構成される。つまり、本実施形態の導体部Ｗ１は、アルミニウム又はアルミニウム合金によって構成された金属素線を複数束ねた芯線である。一方、本実施形態の圧着端子１において、母材１０は、銅（Ｃｕ）又は銅合金によって構成され、メッキ１１の外層１２は、銀（Ａｇ）によって構成され、メッキ１１の内層１３は、ニッケル（Ｎｉ）によって構成される。 Here, in the electric wire W of this embodiment, the conductor portion W1 is made of aluminum (Al) or an aluminum alloy. That is, the conductor portion W1 of this embodiment is a core wire formed by bundling together a plurality of metal wires made of aluminum or an aluminum alloy. Meanwhile, in the crimp terminal 1 of this embodiment, the base material 10 is made of copper (Cu) or a copper alloy, the outer layer 12 of the plating 11 is made of silver (Ag), and the inner layer 13 of the plating 11 is made of nickel (Ni).

その上で、本実施形態の圧着端子１は、導体部Ｗ１と当接する外層１２の表面１２ａに凹凸部分１５が設けられている。凹凸部分１５は、軸線方向Ｘおよび幅方向Ｙに互いに間隔をあけて設けられた複数の凹部１５ａと、軸線方向Ｘおよび幅方向Ｙに互いに間隔をあけて設けられた複数の凸部１５ｂと、を含んでいる。凹凸部分１５は、例えば、導体圧着部４６を構成する基部４１、及び、一対のバレル片部４２、４３に渡って設けられ、導体部Ｗ１の表面に設けられうる酸化被膜Ｗ１ａを少なくとも部分的に破壊する機能を有している。凹凸部分１５は、導体圧着部４６を構成する外層１２、内層１３、及び、母材１０のうち外層１２のみに設けられ、内層１３、及び、母材１０には設けられていない。凹部１５ａおよび凸部１５ｂの一つ一つの大きさは、例えば、導体部Ｗ１の素線の太さに対応して設定されている。凹凸部分１５は、凹凸領域等とも称される。 In addition, the crimp terminal 1 of this embodiment has an uneven portion 15 on the surface 12a of the outer layer 12 that abuts against the conductor portion W1. The uneven portion 15 includes a plurality of recesses 15a spaced apart from each other in the axial direction X and the width direction Y, and a plurality of protrusions 15b spaced apart from each other in the axial direction X and the width direction Y. The uneven portion 15 is provided, for example, across the base portion 41 and the pair of barrel pieces 42 and 43 that constitute the conductor crimping portion 46, and has the function of at least partially destroying the oxide film W1a that may be provided on the surface of the conductor portion W1. The uneven portion 15 is provided only on the outer layer 12 of the outer layer 12, the inner layer 13, and the base material 10 that constitute the conductor crimping portion 46, and is not provided on the inner layer 13 and the base material 10. The size of each of the recesses 15a and the protrusions 15b is set, for example, in accordance with the thickness of the wire of the conductor portion W1. The uneven portion 15 is also referred to as an uneven area, etc.

そして、本実施形態では、外層１２の表面１２ａの算術平均高さＳａが、０．５μｍ以上１００μｍ以下に設定されている。算術平均高さＳａは、表面１２ａの平均面１２ａ１に対する各凸部１５ｂの高さｔ１および各凹部１５ａの深さｔ２の差（高低差）の絶対値の平均によって算出される。算術平均高さＳａは、例えば、レーザセンサから外層１２の表面１２ａに向けてラインレーザを照射し、その反射光から表面１２ａの断面形状を瞬時に取得するプロファイル測定器等によって測定可能である。 In this embodiment, the arithmetic mean height Sa of the surface 12a of the outer layer 12 is set to 0.5 μm or more and 100 μm or less. The arithmetic mean height Sa is calculated by averaging the absolute values of the difference (height difference) between the height t1 of each convex portion 15b and the depth t2 of each concave portion 15a relative to the average plane 12a1 of the surface 12a. The arithmetic mean height Sa can be measured, for example, by a profile measuring instrument that irradiates a line laser from a laser sensor toward the surface 12a of the outer layer 12 and instantly obtains the cross-sectional shape of the surface 12a from the reflected light.

図５は、実施形態に係る端子付き電線１００の評価結果を説明する表である。図５に示される評価結果は、試験片Ａに対して、表面粗さ（算術平均高さＳａ）が異なる二つの試験片Ｂをそれぞれ１０Ｎの荷重で接触させ、接触抵抗を測定したものである。ここで、試験片Ａは、アルミニウム（Ａｌ）によって構成された試験片であり、二つの試験片Ｂは、銀（Ａｇ）によって構成された外層１２を含むメッキ１１が施され当該メッキ１１の表面１２ａに凹凸部分１５が設けられた試験片である。 Figure 5 is a table illustrating the evaluation results of the electric wire with terminal 100 according to the embodiment. The evaluation results shown in Figure 5 were obtained by bringing two test pieces B, each with a different surface roughness (arithmetic mean height Sa), into contact with test piece A under a load of 10 N, and measuring the contact resistance. Here, test piece A is a test piece made of aluminum (Al), and the two test pieces B are test pieces that are applied with plating 11 including an outer layer 12 made of silver (Ag), and have uneven portions 15 on the surface 12a of the plating 11.

図５に示される評価結果から明らかのように、表面粗さが０．１６２μｍの試験片Ｂでは、試験片Ａとの接触抵抗が１２３３．２４ｍΩであったのに対し、表面粗さが０．５２１４μｍの試験片Ｂでは、試験片Ａとの接触抵抗が０．５６ｍΩであり、接触抵抗が著しく減少していることが解る。一方で、試験片Ｂの表面粗さが１００μｍを超えると接触抵抗の減少値が飽和状態に達する。したがって、本実施形態では、外層１２の表面１２ａの算術平均高さＳａは、０．５μｍ以上１００μｍ以下に設定されている。 As is clear from the evaluation results shown in FIG. 5, the contact resistance between test piece B, which has a surface roughness of 0.162 μm, and test piece A was 1233.24 mΩ, whereas the contact resistance between test piece B, which has a surface roughness of 0.5214 μm, and test piece A was 0.56 mΩ, showing that the contact resistance is significantly reduced. On the other hand, when the surface roughness of test piece B exceeds 100 μm, the reduction in contact resistance reaches a saturation state. Therefore, in this embodiment, the arithmetic mean height Sa of the surface 12a of the outer layer 12 is set to be 0.5 μm or more and 100 μm or less.

以上のように、本実施形態の端子付き電線１００では、導体圧着部４６が導体部Ｗ１に圧着され、被覆圧着部４８が絶縁被覆部Ｗ２に圧着されることで、圧着端子１が電線Ｗの端末に圧着される。そして、端子付き電線１００は、圧着端子１の電気接続部２に相手部材Ｔが電気的に接続される。このような構成において、圧着端子１は、母材１０によって電気接続部２、導体圧着部４６、及び、被覆圧着部４８が一体で形成され、少なくとも導体圧着部４６の内面にメッキ１１が施される。そして、メッキ１１は、導体部Ｗ１と当接する表面１２ａに凹凸部分１５が設けられた外層１２と、外層１２と母材１０との間に介在される内層１３と、を含み、外層１２の表面１２ａの算術平均高さＳａは、０．５μｍ以上１００μｍ以下である。この構成により、圧着端子１は、０．５μｍ以上１００μｍ以下に設定された外層１２の表面１２ａの凹凸部分１５で電線Ｗ側の導体部Ｗ１の表面に設けられうる酸化被膜Ｗ１ａを少なくとも部分的に破壊し易くすることができる。この結果、端子付き電線１００は、適正な導通性能を確保することができる。 As described above, in the electric wire with terminal 100 of this embodiment, the conductor crimping portion 46 is crimped to the conductor portion W1, and the covering crimping portion 48 is crimped to the insulating covering portion W2, so that the crimp terminal 1 is crimped to the end of the electric wire W. Then, in the electric wire with terminal 100, the mating member T is electrically connected to the electrical connection portion 2 of the crimp terminal 1. In this configuration, the crimp terminal 1 has the electrical connection portion 2, the conductor crimping portion 46, and the covering crimping portion 48 integrally formed by the base material 10, and at least the inner surface of the conductor crimping portion 46 is plated with plating 11. Then, the plating 11 includes an outer layer 12 having an uneven portion 15 on the surface 12a that contacts the conductor portion W1, and an inner layer 13 interposed between the outer layer 12 and the base material 10, and the arithmetic mean height Sa of the surface 12a of the outer layer 12 is 0.5 μm or more and 100 μm or less. This configuration allows the crimp terminal 1 to easily break down at least part of the oxide film W1a that may be formed on the surface of the conductor part W1 on the electric wire W side at the uneven portion 15 of the surface 12a of the outer layer 12, which is set to 0.5 μm or more and 100 μm or less. As a result, the electric wire with terminal 100 can ensure proper electrical conductivity.

また、本実施形態の端子付き電線１００では、導体部Ｗ１は、アルミニウム又はアルミニウム合金によって構成され、母材１０は、銅又は銅合金によって構成され、外層１２は、銀によって構成され、内層１３は、ニッケルによって構成される。この構成により、端子付き電線１００は、適正な導通性能を確保することができる圧着端子１および電線Ｗを実現することができる。 In the electric wire with terminal 100 of this embodiment, the conductor portion W1 is made of aluminum or an aluminum alloy, the base material 10 is made of copper or a copper alloy, the outer layer 12 is made of silver, and the inner layer 13 is made of nickel. With this configuration, the electric wire with terminal 100 can realize a crimp terminal 1 and an electric wire W that can ensure proper electrical conductivity.

なお、導体圧着部４６は、上述したＢクリンプ形式に限らず、例えば、一対のバレル片部４２、４３が電線Ｗに対して巻き付けられて加締められ、圧着された状態で、互いに重なり合う（オーバーラップする）ように構成されてもよい。この場合、一対のバレル片部４２、４３は、基部４１側の根元から先端までの長さに関し、一方の長さが他方の長さよりも長く形成される。同様に、被覆圧着部４８は、一対のバレル片部４４、４５が電線Ｗに対して巻き付けられて加締められ、圧着された状態で、互いに重なり合う（オーバーラップする）ように構成されてもよい。 The conductor crimping portion 46 is not limited to the B crimp type described above, and may be configured, for example, so that the pair of barrel pieces 42, 43 overlap each other when wrapped around the electric wire W, crimped, and crimped. In this case, the pair of barrel pieces 42, 43 are formed such that one is longer than the other in length from the root to the tip on the base 41 side. Similarly, the insulation crimping portion 48 may be configured so that the pair of barrel pieces 44, 45 overlap each other when wrapped around the electric wire W, crimped, and crimped.

また、電線圧着部４は、中間部４７を介して一対のバレル片部４２、４３と一対のバレル片部４４、４５とが分断されたいわゆる別体バレル型の圧着部を構成するものとして説明したがこれに限らない。電線圧着部４は、導体圧着部４６、中間部４７、被覆圧着部４８において、一対のバレル片部が軸線方向Ｘに沿って連続し一体化されたいわゆる一体バレル型の圧着部を構成してもよい。 The wire crimping portion 4 has been described as constituting a so-called separate barrel type crimping portion in which a pair of barrel pieces 42, 43 and a pair of barrel pieces 44, 45 are separated via the intermediate portion 47, but this is not limited thereto. The wire crimping portion 4 may also constitute a so-called integral barrel type crimping portion in which a pair of barrel pieces are continuous and integrated along the axial direction X in the conductor crimping portion 46, the intermediate portion 47, and the coating crimping portion 48.

また、端子付き電線１００は、例えば、車両等に使用されるワイヤハーネス等に適用されるものとして説明したがこれに限らない。 Furthermore, the terminal-equipped electric wire 100 has been described as being applied to, for example, a wire harness used in a vehicle, but is not limited to this.

以上、本発明の実施形態が例示されたが、上記実施形態は一例であって、発明の範囲を限定することは意図していない。上記実施形態は、その他の様々な形態で実施されることが可能であり、発明の要旨を逸脱しない範囲で、種々の省略、置き換え、組み合わせ、変更を行うことができる。また、各構成や、形状、等のスペック（構造や、種類、方向、形式、大きさ、長さ、幅、厚さ、高さ、数、配置、位置、材質等）は、適宜に変更して実施することができる。 Although the above is an example of an embodiment of the present invention, the above embodiment is merely an example and is not intended to limit the scope of the invention. The above embodiment can be implemented in various other forms, and various omissions, substitutions, combinations, and modifications can be made without departing from the spirit of the invention. Furthermore, the specifications of each configuration, shape, etc. (structure, type, direction, format, size, length, width, thickness, height, number, arrangement, position, material, etc.) can be modified as appropriate.

１圧着端子
２電気接続部
１０母材
１０ａ内面
１１メッキ
１２外層
１２ａ表面
１３内層
１５凹凸部分
４６導体圧着部
４８被覆圧着部
１００端子付き電線
Ｔ相手部材
Ｗ電線
Ｗ１導体部
Ｗ２絶縁被覆部 Reference Signs List 1 Crimp terminal 2 Electrical connection portion 10 Base material 10a Inner surface 11 Plating 12 Outer layer 12a Surface 13 Inner layer 15 Uneven portion 46 Conductor crimping portion 48 Cover crimping portion 100 Terminal-attached electric wire T Counterpart W Electric wire W1 Conductor portion W2 Insulating cover portion

Claims

An electric wire in which a conductive conductor portion is covered with an insulating covering portion having insulating properties;
a crimp terminal including an electrical connection portion electrically connected to a mating member, a conductor crimping portion crimped to the conductor portion exposed from an end of the insulating coating portion, and a coating crimping portion crimped to the insulating coating portion,
The crimp terminal has the electrical connection portion, the conductor crimping portion, and the coating crimping portion integrally formed from a base material, and at least an inner surface of the conductor crimping portion is plated,
the plating includes an outer layer having an uneven portion on a surface that contacts the conductor portion, and an inner layer interposed between the outer layer and the base material,
The electric wire with terminal, wherein the arithmetic mean height Sa of the surface of the outer layer is 0.5 μm or more and 100 μm or less.

the conductor portion is made of aluminum or an aluminum alloy,
The base material is made of copper or a copper alloy,
the outer layer is made of silver;
The inner layer is made of nickel.
The electric wire with terminal according to claim 1 .