JP2016181367A - Connection structure, wire harness, and method of manufacturing connection structure - Google Patents

Connection structure, wire harness, and method of manufacturing connection structure Download PDF

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JP2016181367A
JP2016181367A JP2015060375A JP2015060375A JP2016181367A JP 2016181367 A JP2016181367 A JP 2016181367A JP 2015060375 A JP2015060375 A JP 2015060375A JP 2015060375 A JP2015060375 A JP 2015060375A JP 2016181367 A JP2016181367 A JP 2016181367A
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resin
curable resin
wire
connection structure
core wire
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JP6549868B2 (en
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泰 木原
Yasushi Kihara
泰 木原
弘哲 中山
Hirotetsu Nakayama
弘哲 中山
拓郎 山田
Takuo Yamada
拓郎 山田
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Furukawa Electric Co Ltd
Furukawa Automotive Systems Inc
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Furukawa Automotive Systems Inc
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Abstract

PROBLEM TO BE SOLVED: To provide a connection structure capable of achieving good sealing by suppressing variation in the resin curing, while exhibiting excellent anticorrosion properties even under various use environments, and excellent productivity, and to provide a wiring harness and a method of manufacturing the connection structure.SOLUTION: A connection structure 1 is constituted of a terminal 2 having a connector 21 for electrical connection with an external terminal, and a wire crimp part 22 coupled with the connector and crimped to the wire end, a wire 3 having a core wire 31 consisting of one or a plurality of conductors, and an insulation coating 32 covering the core wire, and a resin coating part 4 formed at the wire crimp part 22 and covering the core wire end 31A where the insulation coating of the wire end 3A is stripped. The resin coating part 4 has an inner resin coating part 41 composed of an anaerobic curing resin and filling both between the wire crimp part 22-a conductor 31a and between a plurality of conductors 31a, 31a, and an outer resin coating part 42 composed of a UV-curing resin, and formed to seal the inner resin coating part in cooperation with the wire crimp part 22.SELECTED DRAWING: Figure 2

Description

本発明は、電線と端子を圧着してなる接続構造体と、該接続構造体を備えるワイヤハーネス、及び端子の製造方法に関し、特に、自動車のワイヤハーネスに使用される接続構造体及びその製造方法に関する。   The present invention relates to a connection structure formed by crimping an electric wire and a terminal, a wire harness including the connection structure, and a method for manufacturing the terminal, and in particular, a connection structure used for a wire harness of an automobile and a method for manufacturing the connection structure. About.

従来、自動車、OA機器、家電製品等の分野において、電力線や信号線として、ワイヤハーネスが用いられている。ワイヤハーネスは、電線に取り付けられ他の機器等との接続に用いられる端子を有する。電線は、絶縁体で被覆された被覆部と、被覆部先端から芯線が露出する導体部分の露出部とを有し、端子が被覆部および露出部のそれぞれに圧着されることにより、導電性の接続構造体が構成されている。このような接続構造体において、端子の材料として電気特性に優れる銅が使用されることが多く、また近年、軽量化の観点から、芯線材料としてアルミニウムを用いた電線が提案されている。   Conventionally, wire harnesses are used as power lines and signal lines in the fields of automobiles, OA equipment, home appliances, and the like. A wire harness has a terminal attached to an electric wire and used for connection with other apparatuses. The electric wire has a covering portion coated with an insulator and an exposed portion of the conductor portion where the core wire is exposed from the tip of the covering portion, and the terminal is crimped to each of the covering portion and the exposed portion, thereby making the conductive portion A connection structure is configured. In such a connection structure, copper having excellent electrical characteristics is often used as a material for terminals, and in recent years, electric wires using aluminum as a core wire material have been proposed from the viewpoint of weight reduction.

例えば、アルミニウムと銅のような異種金属の接触部分に水分が付着すると、標準電極電位の違いから、異種金属間腐食(電食)が発生する恐れがある。特に、アルミニウムと銅との標準電極電位差は大きいから、電気的に卑であるアルミニウム側の腐食が進行する。このため、端子材料に銅、芯線材料にアルミニウムを用いると、芯線と端子との接続状態が不安定となり、接触抵抗の増加や線径の減少による電気抵抗の増大、さらには断線が生じて電装部品の誤動作、機能停止に至る恐れがある。   For example, when moisture adheres to a contact portion between different metals such as aluminum and copper, corrosion between different metals (electrochemical corrosion) may occur due to a difference in standard electrode potential. In particular, since the standard electrode potential difference between aluminum and copper is large, corrosion on the aluminum side, which is electrically base, proceeds. For this reason, if copper is used for the terminal material and aluminum is used for the core wire material, the connection between the core wire and the terminal becomes unstable, increasing the electrical resistance due to an increase in contact resistance or a decrease in wire diameter, and further causing disconnection. There is a risk of malfunctioning of the parts and functional failure.

そこで、このような異種金属が接触する接続構造体において、電線と端子の接続部を樹脂でコーティングしたものが提案されている。具体的には、図8に示すように、接続構造体100の電線接続部分121に、電線先端部142の表面を覆う樹脂封止部129Aと、主に樹脂封止部129Aの外面を覆う樹脂封止部129Bとからなる樹脂封止部129が形成されている。この樹脂封止部129を構成する絶縁樹脂は、樹脂封止部129Aを構成する第1絶縁樹脂と、樹脂封止部129Bを構成する第2絶縁樹脂とで構成される。第1絶縁樹脂は、硬化前の粘度が50μm以下であり、隙間に浸透可能な低粘度(500〜2,000mPa・s)の樹脂であり、第2絶縁樹脂は、第1絶縁樹脂よりも高粘度(5,000〜20,000mPa・s)の樹脂で形成される。   Therefore, a connection structure in which different kinds of metals are in contact has been proposed in which a connection portion between an electric wire and a terminal is coated with a resin. Specifically, as shown in FIG. 8, a resin sealing portion 129 </ b> A that covers the surface of the wire tip 142 and a resin that mainly covers the outer surface of the resin sealing portion 129 </ b> A are provided on the wire connection portion 121 of the connection structure 100. A resin sealing portion 129 composed of the sealing portion 129B is formed. The insulating resin that constitutes the resin sealing portion 129 includes a first insulating resin that constitutes the resin sealing portion 129A and a second insulating resin that constitutes the resin sealing portion 129B. The first insulating resin has a viscosity before curing of 50 μm or less and is a low-viscosity (500 to 2,000 mPa · s) resin that can penetrate into the gap. The second insulating resin is higher than the first insulating resin. It is formed of a resin having a viscosity (5,000 to 20,000 mPa · s).

電線接続部分121の表面に樹脂封止部129を形成する際には、先ず、低粘度の第1絶縁樹脂を複数本の芯線143の隙間に浸透させると共に、電線接続部分121の表面全体に広がりを持たせて被覆する。次に、第1絶縁樹脂の外面を高粘度の第2絶縁樹脂で嵩高に被覆する。その後、電線接続部分121の表面に被覆した第1絶縁樹脂及び第2絶縁樹脂の双方を紫外線硬化させて、樹脂封止部129Aと樹脂封止部129Bとの2層からなる樹脂封止部129を形成する。このように、接続構造体の電線接続部分に粘度の異なる紫外線硬化樹脂を充填して共に硬化することで、芯線−端子間での異種金属間腐食を防止することが可能となっている(例えば、特許文献1)。   When forming the resin sealing portion 129 on the surface of the wire connection portion 121, first, the low-viscosity first insulating resin is permeated into the gaps between the plurality of core wires 143 and spreads over the entire surface of the wire connection portion 121. To cover. Next, the outer surface of the first insulating resin is covered with a bulky second insulating resin. Thereafter, both the first insulating resin and the second insulating resin coated on the surface of the wire connecting portion 121 are cured with ultraviolet rays, and the resin sealing portion 129 formed of two layers of the resin sealing portion 129A and the resin sealing portion 129B. Form. In this way, it is possible to prevent corrosion between different metals between the core wire and the terminal by filling the wire connecting portion of the connection structure with ultraviolet curable resin having different viscosities and curing them together (for example, Patent Document 1).

特開2011−238500号公報JP 2011-238500 A

しかしながら、様々な使用環境下においても良好な電気的特性を発揮しうる製品のニーズに応えるべく、上記のような接続構造体について加速試験を実施すると、以下のような問題が生じることが分かってきた。すなわち、塩水噴霧試験並びに湿熱暴露試験等を行った際、幾つかの実験条件では電線接続部分に形成された樹脂封止部の剥離が発生した。これは、複数本の芯線間の隙間や、芯線と端子の隙間に浸透した紫外線硬化樹脂に十分な光量の紫外線が到達しにくく、第1樹脂封止部を形成する紫外線硬化樹脂の硬化が不完全であることが要因と考えられる。また、第1樹脂封止部を形成する低粘度の紫外線硬化樹脂が漏れ出したり、あるいは電線接続部分での当該樹脂の浸透が不完全であることにより、電線接続部分で第1樹脂封止部及び第2樹脂封止部の接着力が不足する部位が生じていることが要因と考えられる。   However, in order to meet the needs of products that can exhibit good electrical characteristics even under various usage environments, it has been found that the following problems occur when an accelerated test is performed on the connection structure as described above. It was. That is, when a salt spray test and a wet heat exposure test were performed, peeling of the resin sealing portion formed at the wire connection portion occurred under some experimental conditions. This is because the UV curable resin that forms a first resin sealing portion is hard to reach the gap between a plurality of core wires and the UV curable resin that has penetrated into the gap between the core wire and the terminal. Perfection is considered a factor. In addition, the low-viscosity ultraviolet curable resin forming the first resin sealing portion leaks out, or the penetration of the resin at the wire connecting portion is incomplete, so that the first resin sealing portion at the wire connecting portion And it is thought that the site | part which the adhesive force of the 2nd resin sealing part is insufficient has arisen.

本発明の目的は、樹脂硬化のばらつきを抑制して良好な封止を実現し、様々な使用環境下においても優れた防食性を発揮することができ、更には生産性に優れた接続構造体、ワイヤハーネス及び接続構造体の製造方法を提供することにある。   An object of the present invention is to realize a good sealing by suppressing variation in resin curing, exhibit excellent anticorrosion properties under various use environments, and further, a connection structure excellent in productivity. Another object of the present invention is to provide a method for manufacturing a wire harness and a connection structure.

すなわち、上記課題は以下の発明により達成される。
(1)外部端子と電気的に接続されるコネクタ部と、該コネクタ部と連結され且つ電線端部と圧着される電線圧着部とを有する端子と、
一又は複数の導体からなる芯線と、該芯線を被覆する絶縁被覆とを有する電線と、
前記電線圧着部に形成され、少なくとも前記電線端部の絶縁被覆を剥いだ芯線端部を被覆する樹脂被覆部と、で構成される接続構造体であって、
前記樹脂被覆部は、前記電線圧着部−前記導体間及び前記複数の導体間の双方に充てんされ、嫌気性硬化樹脂からなる第1樹脂被覆部と、前記電線圧着部と協働して当該第1樹脂被覆部を密閉するように形成され、紫外線硬化樹脂からなる第2樹脂被覆部と、を有することを特徴とする、接続構造体。
(2)前記紫外線硬化樹脂の硬化前粘度が、前記嫌気性硬化樹脂の硬化前粘度よりも高いことを特徴とする、上記(1)記載の接続構造体。
(3)前記嫌気性硬化樹脂の硬化前粘度が、25℃で10mPa・s〜1000mPa・sであることを特徴とする、上記(1)又は(2)記載の接続構造体。
(4)前記嫌気性硬化樹脂が、嫌気硬化特性及び紫外線硬化特性の双方を有することを特徴とする、上記(1)記載の接続構造体。
(5)前記端子が、銅又は銅合金からなり、
前記電線の芯線が、アルミニウム又はアルミニウム合金からなることを特徴とする、上記(1)〜(4)のいずれかに記載の接続構造体。
(6)上記(1)〜(5)のいずれかに記載の接続構造体を少なくとも1つ備える、ワイヤハーネス。
(7)外部端子と電気的に接続されるコネクタ部と、該コネクタ部と連結され且つ電線端部と圧着される電線圧着部とを備える端子を、電線の絶縁被覆を剥いだ芯線端部に圧着し、更に電線圧着部を樹脂で被覆することにより得られる接続構造体の製造方法であって、
前記電線圧着部−前記導体間及び前記複数の導体間の双方に嫌気性硬化樹脂を充てんする工程と、
前記嫌気性硬化樹脂を紫外線硬化樹脂で覆い、前記電線圧着部と協働して前記嫌気性硬化樹脂を密閉する工程と、
前記紫外線硬化樹脂に紫外線を照射することにより、前記紫外線硬化樹脂を硬化させて第2樹脂被覆部を形成すると共に、前記嫌気性硬化樹脂を硬化させて第1樹脂被覆部を形成する工程と、を有することを特徴とする、接続構造体の製造方法。
That is, the said subject is achieved by the following invention.
(1) A terminal having a connector part electrically connected to an external terminal, and a wire crimping part connected to the connector part and crimped to an end of the electric wire;
An electric wire having a core wire made of one or a plurality of conductors and an insulating coating covering the core wire;
A connection structure formed by the resin crimping portion formed on the wire crimping portion and covering at least the core wire end portion from which the insulation coating of the wire end portion has been peeled,
The resin coating portion is filled in both the wire crimping portion and the conductors and between the plurality of conductors, and cooperates with the first resin coating portion made of anaerobic curable resin and the wire crimping portion. 1. A connection structure comprising: a second resin coating portion formed to seal the resin coating portion and made of an ultraviolet curable resin.
(2) The connection structure according to (1) above, wherein the pre-curing viscosity of the ultraviolet curable resin is higher than the pre-curing viscosity of the anaerobic curable resin.
(3) The connection structure according to (1) or (2), wherein the anaerobic curable resin has a pre-curing viscosity of 10 mPa · s to 1000 mPa · s at 25 ° C.
(4) The connection structure according to the above (1), wherein the anaerobic curable resin has both anaerobic curing characteristics and ultraviolet curing characteristics.
(5) The terminal is made of copper or a copper alloy,
The connection structure according to any one of (1) to (4), wherein the core wire of the electric wire is made of aluminum or an aluminum alloy.
(6) A wire harness comprising at least one connection structure according to any one of (1) to (5) above.
(7) A terminal provided with a connector part electrically connected to an external terminal and a wire crimping part connected to the connector part and crimped to the end of the electric wire is connected to the end of the core wire from which the insulation coating of the electric wire is stripped. It is a manufacturing method of a connection structure obtained by crimping and further coating a wire crimping portion with a resin,
A step of filling anaerobic curable resin between both the wire crimping portion and the conductors and between the conductors;
Covering the anaerobic curable resin with an ultraviolet curable resin and sealing the anaerobic curable resin in cooperation with the wire crimping portion;
Irradiating the ultraviolet curable resin with ultraviolet rays to cure the ultraviolet curable resin to form a second resin coating portion and curing the anaerobic curable resin to form a first resin coating portion; A method for manufacturing a connection structure, comprising:

本発明によれば、接続構造体は、電線圧着部に形成され且つ電線端部の絶縁被覆を剥いだ芯線端部を被覆する樹脂被覆部を備える。そして、樹脂被覆部は、電線圧着部−導体間及び/又は複数の導体間に充てんされ、嫌気性硬化樹脂からなる第1樹脂被覆部と、電線圧着部と協働して当該第1樹脂被覆部を密閉するように形成され、紫外線硬化樹脂からなる第2樹脂被覆部とを有する。本構成により、第2樹脂被覆部を形成する紫外線硬化樹脂が硬化することにより内部が密閉状態となり、第1樹脂被覆部を形成する嫌気性硬化樹脂が空気と遮断されて硬化する。これにより、第1樹脂被覆部の樹脂硬化のばらつきを抑制して良好な封止を実現することができ、様々な使用環境下においても優れた防食性を発揮することができる。また、樹脂被覆部における紫外線硬化樹脂の量が従来に比べて少ないため、短い紫外線照射時間で、外側の紫外線硬化樹脂のみならず、内側の嫌気性硬化樹脂を硬化させることができ、生産性に優れた接続構造体を提供することが可能となる。   According to this invention, a connection structure is equipped with the resin coating part which covers the core wire end part which was formed in the electric wire crimping part and peeled off the insulation coating of the electric wire end part. The resin coating portion is filled between the wire crimping portion and the conductor and / or between the plurality of conductors, and cooperates with the first resin coating portion made of an anaerobic curable resin and the wire crimping portion. And a second resin coating portion made of an ultraviolet curable resin. With this configuration, the ultraviolet curable resin that forms the second resin coating portion is cured, so that the inside is hermetically sealed, and the anaerobic curable resin that forms the first resin coating portion is blocked from air and cured. Thereby, the dispersion | variation in the resin hardening of a 1st resin coating part can be suppressed, favorable sealing can be implement | achieved, and the anticorrosion property excellent in various use environments can be exhibited. In addition, since the amount of UV curable resin in the resin coating portion is smaller than conventional, not only the outer UV curable resin but also the inner anaerobic curable resin can be cured in a short UV irradiation time, which increases productivity. An excellent connection structure can be provided.

また、紫外線硬化樹脂の硬化前粘度が嫌気性硬化樹脂の硬化前粘度よりも高いため、硬化前の状態で内側の嫌気性硬化樹脂の流動が外側の紫外線硬化樹脂によって抑制される。よって硬化前に嫌気性硬化樹脂が電線圧着部の周りに流れ出すのを防止することができ、硬化時に嫌気性硬化樹脂を確実に空気遮断することができる。   Moreover, since the pre-curing viscosity of the ultraviolet curable resin is higher than the pre-cured viscosity of the anaerobic curable resin, the flow of the inner anaerobic curable resin is suppressed by the outer ultraviolet curable resin in a state before curing. Accordingly, it is possible to prevent the anaerobic curable resin from flowing out around the wire crimping portion before curing, and the anaerobic curable resin can be surely shut off by air during curing.

また、嫌気性硬化樹脂の硬化前粘度が、25℃で10mPa・s〜1000mPa・sであるので、電線圧着部−導体間及び/又は複数の導体間に存在する隙間に嫌気性硬化樹脂を十分に浸透させることができ、防食性を更に向上させることができる。   In addition, since the viscosity before curing of the anaerobic curable resin is 10 mPa · s to 1000 mPa · s at 25 ° C., sufficient anaerobic curable resin is provided in the gap between the wire crimping portion and the conductor and / or between the plurality of conductors. The anticorrosion property can be further improved.

更に、嫌気性硬化樹脂が、嫌気硬化特性及び紫外線硬化特性の双方を有するので、外側の紫外線硬化樹脂の硬化時に照射される紫外線によって、内側の嫌気性硬化樹脂を硬化させることができ、空気遮断及び紫外線照射の双方により内側の嫌気性硬化樹脂の硬化時間を短縮することができ、生産性を更に向上することができる。   Further, since the anaerobic curable resin has both anaerobic and ultraviolet curing properties, the inner anaerobic curable resin can be cured by the ultraviolet rays irradiated when the outer ultraviolet curable resin is cured, and the air is blocked. In addition, the curing time of the anaerobic curable resin on the inner side can be shortened by both irradiation and ultraviolet irradiation, and productivity can be further improved.

本発明の実施形態に係る接続構造体の構成を概略的に示す図であり、(a)は接続構造体の全体斜視図、(b)は圧着前の状態を示す全体斜視図である。It is a figure which shows roughly the structure of the connection structure which concerns on embodiment of this invention, (a) is a whole perspective view of a connection structure, (b) is a whole perspective view which shows the state before crimping | compression-bonding. (a)は、図1(a)の接続構造体の長手方向部分断面図であり、(b)は、(a)における電線圧着部の長手方向断面図である。(A) is a longitudinal direction fragmentary sectional view of the connection structure of Drawing 1 (a), and (b) is a longitudinal direction sectional view of an electric wire crimping part in (a). (a)〜(d)は、本実施形態に係る接続構造体の製造方法を示す図である。(A)-(d) is a figure which shows the manufacturing method of the connection structure which concerns on this embodiment. 図1における樹脂被覆部の変形例及びその検査方法を示す図である。It is a figure which shows the modification of the resin coating part in FIG. 1, and its inspection method. (a)〜(b)は、図2(b)の接続構造体の変形例を示す長手方向断面図である。(A)-(b) is a longitudinal cross-sectional view which shows the modification of the connection structure of FIG.2 (b). (a)〜(c)は、図2(a)の接続構造体の他の変形例を説明するための長手方向断面図である。(A)-(c) is a longitudinal cross-sectional view for demonstrating the other modification of the connection structure of Fig.2 (a). 図1の接続構造体の他の変形例を示す全体斜視図である。FIG. 10 is an overall perspective view showing another modification of the connection structure of FIG. 1. 従来の接続構造体の構成を示す長手方向断面図である。It is longitudinal direction sectional drawing which shows the structure of the conventional connection structure.

以下、本発明の実施形態を、図面を参照しながら詳細に説明する。
図1(a)は、本実施形態に係る接続構造体の構成を概略的に示す全体斜視図、(b)は圧着前の状態を示す全体斜視図、図2(a)は、図1(a)の接続構造体の長手方向断面図である。なお、図1における接続構造体は、その一例を示すものであり、本発明に係るそれぞれの部分の構成、各構成の形状、寸法等は、図1のものに限られないものとする。
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1A is an overall perspective view schematically showing the configuration of the connection structure according to the present embodiment, FIG. 1B is an overall perspective view showing a state before crimping, and FIG. 2A is FIG. It is longitudinal direction sectional drawing of the connection structure of a). Note that the connection structure in FIG. 1 shows an example, and the configuration of each part, the shape, size, and the like of each component according to the present invention are not limited to those in FIG.

図1(a)及び(b)に示すように、接続構造体1は、端子2、電線3、及びこれらの接続部に配置された樹脂被覆部4を備え、樹脂被覆部4によって上記接続部が封止されてなるものである。具体的には、端子2は、不図示の外部端子と電気的に接続されるコネクタ部21と、該コネクタ部と連結され且つ後述の電線端部と圧着される電線圧着部22とを有する。電線3は、複数の導体31a,31aからなる芯線31と、該芯線を被覆する絶縁被覆32とを有する。樹脂被覆部4は、電線圧着部22の一部又は全部に形成されており、少なくとも電線端部3aの絶縁被覆が剥かれた芯線端部31Aを被覆している。   As shown in FIGS. 1A and 1B, the connection structure 1 includes a terminal 2, an electric wire 3, and a resin coating portion 4 disposed in these connection portions, and the connection portion is formed by the resin coating portion 4. Is sealed. Specifically, the terminal 2 includes a connector portion 21 that is electrically connected to an external terminal (not shown), and an electric wire crimping portion 22 that is connected to the connector portion and is crimped to an electric wire end portion described later. The electric wire 3 includes a core wire 31 including a plurality of conductors 31a and 31a and an insulating coating 32 that covers the core wire. The resin coating portion 4 is formed on a part or the whole of the electric wire crimping portion 22 and covers at least the core wire end portion 31A from which the insulating coating of the electric wire end portion 3a is peeled off.

電線3の芯線は、銅又は銅を主成分とする合金や、アルミニウム又はアルミニウムを主成分とする合金などからなる。   The core wire of the electric wire 3 is made of copper, an alloy containing copper as a main component, aluminum, an alloy containing aluminum as a main component, or the like.

端子2は、金属基体からなり、この金属基体を金属材料(銅、アルミニウム、鉄、またはこれらを主成分とする合金等)からなる母材のみで構成するか、或いは導電性と強度を確保するために母材上に金属を主成分とするめっき層を設けて構成することができる。   The terminal 2 is made of a metal substrate, and the metal substrate is made of only a base material made of a metal material (copper, aluminum, iron, or an alloy containing these as a main component), or ensures conductivity and strength. Therefore, a plating layer mainly composed of metal can be provided on the base material.

コネクタ部21は、雄型圧着端子等の挿入タブの挿入を許容するボックス部であり、挿入タブを収容するための収容口21aを有している。本実施形態ではコネクタ部21が雌型端子であるが、後述するように他の形状であってもよい。   The connector portion 21 is a box portion that allows insertion of an insertion tab such as a male crimp terminal, and has an accommodation port 21a for accommodating the insertion tab. In the present embodiment, the connector portion 21 is a female terminal, but may have other shapes as will be described later.

トランジション部23は、コネクタ部21と電線圧着部22の橋渡しとなる部分であり、幅方向断面略コの字型に形成されている。トランジション部23は立体的に形成されていても、平面的に形成されていても良い。端子長手方向の折り曲げに対する機械的強度の観点からは、長手方向の断面2次モーメントが大きくなるように設計するのが好ましい。   The transition portion 23 is a portion that serves as a bridge between the connector portion 21 and the wire crimping portion 22, and is formed in a substantially U-shaped cross section in the width direction. The transition part 23 may be formed in three dimensions or may be formed in a plane. From the viewpoint of mechanical strength against bending in the longitudinal direction of the terminal, it is preferable to design such that the second moment of section in the longitudinal direction is increased.

電線圧着部22は、トランジション部23を介してコネクタ部21に連結された芯線圧着部24と、芯線圧着部24と長手方向Xに沿って設けられ、芯線圧着部24のトランジション部23とは反対側に配置された被覆圧着部25とを有し、これらが上記金属基体にて一体成形される。   The wire crimping part 22 is provided along the core wire crimping part 24 and the longitudinal direction X with the core wire crimping part 24 connected to the connector part 21 via the transition part 23, and is opposite to the transition part 23 of the core wire crimping part 24. And a cover crimping portion 25 disposed on the side, and these are integrally formed with the metal substrate.

圧着前の芯線圧着部24は、図1(b)に示すように、幅方向断面略U型に形成された部位であり、バレル底部24Aと、その幅方向Yの両側から斜め外側上方に延出する一対のバレル片24R,24Lとで構成されている。圧着前の被覆圧着部25も、芯線圧着部24と同様、幅方向断面略U型に形成された部位であり、バレル底部25Aと、その幅方向Yの両側から斜め外側上方に延出する一対のバレル片25R,25Lとで構成されている。圧着時には、バレル底部24Aに芯線端部31Aを、バレル底部25Aに絶縁被覆32をそれぞれ設置し、一対のバレル片24R,24L及び一対のバレル片25R,25Lをそれぞれ内側に折り曲げてかしめることにより、芯線圧着部24が芯線端部31Aに圧着され、また被覆圧着部25が絶縁被覆32に圧着される。   As shown in FIG. 1B, the core wire crimping portion 24 before crimping is a portion formed in a substantially U-shaped cross section in the width direction, and extends obliquely outward and upward from both the barrel bottom 24A and both sides in the width direction Y. A pair of barrel pieces 24R and 24L are provided. Similarly to the core wire crimping portion 24, the cover crimping portion 25 before crimping is a portion formed in a substantially U-shaped cross section in the width direction, and a pair of barrel bottom portions 25A and a pair extending obliquely outwardly from both sides in the width direction Y. Barrel pieces 25R and 25L. At the time of crimping, the core wire end 31A is installed on the barrel bottom 24A, and the insulating coating 32 is installed on the barrel bottom 25A, and the pair of barrel pieces 24R and 24L and the pair of barrel pieces 25R and 25L are bent and crimped inward. The core wire crimping portion 24 is crimped to the core wire end portion 31 </ b> A, and the coating crimping portion 25 is crimped to the insulating coating 32.

樹脂被覆部4は、図2(b)に示すように、芯線圧着部24−導体31a間及び複数の導体31a,31a間の双方に充てんされ、嫌気性硬化樹脂からなる内側樹脂被覆部41(第1樹脂被覆部)と、電線圧着部22と協働して内側樹脂被覆部41を密閉するように形成され、紫外線硬化樹脂からなる外側樹脂被覆部42(第2樹脂被覆部)とを有する。樹脂被覆部4を積層体として見た場合には、内側樹脂被覆部41は下層に位置する下塗り層と称することができ、外側樹脂被覆部42はその上層に位置する上塗り層と称することができる。   As shown in FIG. 2B, the resin coating portion 4 is filled between the core wire crimping portion 24 and the conductors 31a and between the plurality of conductors 31a and 31a, and is formed of an inner resin coating portion 41 made of an anaerobic curable resin ( The first resin coating portion) and the outer resin coating portion 42 (second resin coating portion) made of an ultraviolet curable resin are formed so as to seal the inner resin coating portion 41 in cooperation with the wire crimping portion 22. . When the resin coating portion 4 is viewed as a laminate, the inner resin coating portion 41 can be referred to as an undercoat layer located in the lower layer, and the outer resin coating portion 42 can be referred to as an upper coat layer located in the upper layer. .

内側樹脂被覆部41は、芯線圧着部24−導体31a間や複数の導体31a,31a間に形成された隙間に充てんされる充填材の役割を果たす。この内側樹脂被覆部41は、少なくとも芯線圧着部24−導体31a間及び複数の導体31a,31a間に充てんされていればよく、更に、芯線端部31Aの端面や外周面に形成されていてもよい。   The inner resin coating portion 41 serves as a filler filled in gaps formed between the core wire crimping portion 24 and the conductor 31a or between the plurality of conductors 31a and 31a. The inner resin coating portion 41 only needs to be filled at least between the core wire crimping portion 24 and the conductors 31a and between the plurality of conductors 31a and 31a, and may be formed on the end surface or outer peripheral surface of the core wire end portion 31A. Good.

嫌気性硬化樹脂の硬化前粘度は、JIS K 7117に基づき、25℃で10mPa・s〜1000mPa・sと、比較的低粘度のものが用いられる。嫌気性硬化樹脂の硬化前粘度の上記範囲内の値とすることにより、製造工程において、芯線圧着部24−導体31a間及び/又は複数の導体31a,31a間に存在する隙間或いは微小隙間に、嫌気性硬化樹脂を十分に浸透させることができ、異種金属間腐食や隙間腐食の発生を防止することが可能となり、防食性がより向上する。   The anaerobic curable resin has a relatively low viscosity of 10 mPa · s to 1000 mPa · s at 25 ° C. based on JIS K 7117. By setting the value within the above range of the viscosity before curing of the anaerobic curable resin, in the manufacturing process, between the core wire crimping portion 24 and the conductor 31a and / or between the plurality of conductors 31a and 31a, or a minute gap, The anaerobic curable resin can be sufficiently permeated to prevent the occurrence of corrosion between different metals and crevice corrosion, and the corrosion resistance is further improved.

内側樹脂被覆部41を形成する嫌気性硬化樹脂としては、例えばアクリル系樹脂及びエポキシ系樹脂のいずれかを主成分とする材料を使用することができる。具体的には、スリーボボンド社製1300シリーズ、アセック社製AS−5000シリーズ/AS−6000シリーズなどが挙げられる。芯線圧着部24−導体31a間や複数の導体31a,31a間に形成された隙間が大きい場合には、上記嫌気性硬化樹脂に硬化促進剤(プライマー)が添加されてもよい。   As the anaerobic curable resin for forming the inner resin coating portion 41, for example, a material mainly composed of either an acrylic resin or an epoxy resin can be used. Specific examples include 1300 series manufactured by Threebobond, AS-5000 series / AS-6000 series manufactured by ASEC. When the gap formed between the core wire crimping portion 24 and the conductor 31a or between the plurality of conductors 31a and 31a is large, a curing accelerator (primer) may be added to the anaerobic curable resin.

また、内側樹脂被覆部41で使用される嫌気性硬化樹脂は、嫌気硬化特性のみならず、紫外線硬化特性を有していてもよい。嫌気硬化特性及び紫外線硬化特性の双方を有する複合硬化機能樹脂としては、例えばアクリル系樹脂である。このような複合硬化機能樹脂を用いた場合、製造工程において、外側の紫外線硬化樹脂の硬化時に照射される紫外線によって、内側の嫌気性硬化樹脂を硬化させることができ、空気遮断及び紫外線照射の双方により内側の嫌気性硬化樹脂の硬化時間を短縮することができ、生産性を更に向上することが可能となる。   Moreover, the anaerobic curable resin used in the inner resin coating portion 41 may have not only an anaerobic curable characteristic but also an ultraviolet curable characteristic. The composite curing functional resin having both anaerobic curing characteristics and ultraviolet curing characteristics is, for example, an acrylic resin. When such a composite curable functional resin is used, the inner anaerobic curable resin can be cured by the ultraviolet rays irradiated when the outer ultraviolet curable resin is cured in the manufacturing process, and both air blocking and ultraviolet irradiation are performed. Thus, the curing time of the inner anaerobic curable resin can be shortened, and the productivity can be further improved.

外側樹脂被覆部42は、内側樹脂被覆部41の上面及び側面を覆うコーティング材の役割を果たす。この外側樹脂被覆部41は、少なくとも内側樹脂被覆部41の上面及び側面に配されて内側樹脂被覆部41を密閉可能に形成されればよく、更に、芯線圧着部24の上面全体及び被覆圧着部25の上面の一部にも一体的に形成されてもよい。このように、外側樹脂被覆部42が内側樹脂被覆部41全体を覆って形成されることにより、内側樹脂被覆部41が空気(外気)と遮断される。   The outer resin coating portion 42 serves as a coating material that covers the upper surface and side surfaces of the inner resin coating portion 41. The outer resin coating portion 41 may be disposed on at least the upper surface and the side surface of the inner resin coating portion 41 so as to be able to seal the inner resin coating portion 41, and further, the entire upper surface of the core wire crimping portion 24 and the coated crimping portion. It may be formed integrally with a part of the upper surface of 25. Thus, the outer resin coating portion 42 is formed so as to cover the entire inner resin coating portion 41, whereby the inner resin coating portion 41 is blocked from air (outside air).

紫外線硬化樹脂の硬化前粘度は、嫌気性硬化樹脂の硬化前粘度よりも高い。これにより、硬化前の状態で、外側の紫外線硬化樹脂が内側の嫌気性硬化樹脂の流動を抑制する。よって硬化前に嫌気性硬化樹脂が電線圧着部22の周り、例えばトランジション部23側に流れ出すのを防止することができ、硬化時に嫌気性硬化樹脂が確実に空気遮断される。   The pre-curing viscosity of the ultraviolet curable resin is higher than the pre-curing viscosity of the anaerobic curable resin. Thereby, the outer ultraviolet curing resin suppresses the flow of the inner anaerobic curing resin in a state before curing. Therefore, it is possible to prevent the anaerobic curable resin from flowing around the wire crimping portion 22, for example, to the transition portion 23 side before curing, and the anaerobic curable resin is surely air-blocked during the curing.

外側樹脂被覆部42を形成する紫外線硬化樹脂は、例えばアクリル系樹脂、ウレタン系樹脂、ポリアミド系樹脂、エポキシ系樹脂、フッ素系樹脂、ポリビニルブチラール系樹脂、フェノール系樹脂、ポリイミド系樹脂、及びアクリルゴム系樹脂のいずれかを主成分とする材料を使用することができる。例えば具体的には、スリーボンド社製3000シリーズ/3100シリーズ、ヘンケル社製ロックタイト300シリーズ/3000シリーズ、ケミテック社製ケミシールU−400シリーズなどが挙げられる。   Examples of the ultraviolet curable resin that forms the outer resin coating 42 include acrylic resins, urethane resins, polyamide resins, epoxy resins, fluorine resins, polyvinyl butyral resins, phenol resins, polyimide resins, and acrylic rubbers. A material mainly composed of any one of the resin-based resins can be used. Specific examples include 3000 series / 3100 series manufactured by ThreeBond Co., Loctite 300 series / 3000 series manufactured by Henkel, and Chemi-Seal U-400 series manufactured by Chemtech.

次に、本実施形態に係る接続構造体1の製造方法を、図3(a)〜(d)を用いて説明する。
先ず、オープンバレル型の端子2と、絶縁被覆32が剥かれた芯線端部31Aを有する芯線3を準備し(図1(b)参照)、電線圧着部22の芯線圧着部24及び被覆圧着部25を加締めて、芯線圧着部24が芯線端部31Aに、被覆圧着部25が絶縁被覆32にそれぞれ圧着された構造体を形成する(図3(a))。
Next, a method for manufacturing the connection structure 1 according to the present embodiment will be described with reference to FIGS.
First, the core wire 3 having the open barrel type terminal 2 and the core wire end portion 31A from which the insulation coating 32 is peeled off is prepared (see FIG. 1B), and the core wire crimping portion 24 and the covering crimping portion of the wire crimping portion 22 are prepared. 25 is caulked to form a structure in which the core crimping portion 24 is crimped to the core end portion 31A and the covering crimping portion 25 is crimped to the insulating coating 32 (FIG. 3A).

次に、芯線端部31Aが露出している部分に、硬化前の嫌気性硬化樹脂41’を塗布あるいはスプレーし、芯線圧着部24−導体31a間及び複数の導体31a,31a間の双方に硬化前の嫌気性硬化樹脂41’を充てんする(図3(b))。このとき、嫌気性硬化樹脂41’の粘度が低いため、芯線圧着部24−導体31a間や複数の導体31a,31a間の隙間にまで嫌気性硬化樹脂が入り込んでこれらの隙間にほぼ均一に満遍なく充てんされ、また、芯線端部31Aの露出面31A−1が嫌気性硬化樹脂によって覆われる。なお、硬化前の嫌気性硬化樹脂41’は、少なくとも芯線圧着部24−導体31a間及び複数の導体31a,31a間の双方に充てんされればよく、芯線端部31Aの露出面31A−1上に形成されていなくてもよい。   Next, anaerobic cured resin 41 ′ before curing is applied or sprayed to the exposed portion of the core wire end 31A, and cured both between the core crimping portion 24 and the conductor 31a and between the plurality of conductors 31a and 31a. The previous anaerobic curable resin 41 ′ is filled (FIG. 3B). At this time, since the viscosity of the anaerobic curable resin 41 ′ is low, the anaerobic curable resin enters the gap between the core wire crimping portion 24 and the conductor 31 a and the gaps between the plurality of conductors 31 a and 31 a, so that these gaps are almost uniformly distributed. The exposed surface 31A-1 of the core wire end portion 31A is covered with an anaerobic curable resin. The anaerobic curable resin 41 ′ before curing may be filled at least between the core wire crimping portion 24 and the conductor 31a and between the plurality of conductors 31a and 31a, and on the exposed surface 31A-1 of the core wire end portion 31A. It does not need to be formed.

次いで、嫌気性硬化樹脂41’を硬化前の紫外線硬化樹脂42’で覆い、電線圧着部22と協働して嫌気性硬化樹脂42’を密閉する(図3(c))。具体的には、嫌気性硬化樹脂41’の露出面41’−1に紫外線硬化樹脂42’を塗布あるいはスプレーすると共に、バレル片24Lの露出面24L−1の全体、及びバレル片25Lの露出面25L−1の一部にも、紫外線硬化樹脂42’を連続的に塗布あるいはスプレーし、嫌気性硬化樹脂41’が空気(外気)と接触しないようにする。またこのとき、紫外線硬化樹脂42’の粘度が嫌気性硬化樹脂41’の粘度よりも高くすることにより、嫌気性硬化樹脂41’の流動が紫外線硬化樹脂42’によって抑制され、芯線圧着部24−導体31a間及び複数の導体31a,31a間に充てんされた嫌気性硬化樹脂41’がほぼそのままの位置で保持される。   Next, the anaerobic curable resin 41 ′ is covered with an uncured ultraviolet curable resin 42 ′, and the anaerobic curable resin 42 ′ is sealed in cooperation with the wire crimping portion 22 (FIG. 3C). Specifically, the ultraviolet curable resin 42 ′ is applied or sprayed onto the exposed surface 41′-1 of the anaerobic curable resin 41 ′, and the entire exposed surface 24L-1 of the barrel piece 24L and the exposed surface of the barrel piece 25L. An ultraviolet curable resin 42 'is continuously applied or sprayed to a part of 25L-1 so that the anaerobic curable resin 41' does not come into contact with air (outside air). At this time, by making the viscosity of the ultraviolet curable resin 42 'higher than the viscosity of the anaerobic curable resin 41', the flow of the anaerobic curable resin 41 'is suppressed by the ultraviolet curable resin 42', and the core wire crimping portion 24- The anaerobic curable resin 41 ′ filled between the conductors 31a and between the plurality of conductors 31a and 31a is held at almost the same position.

その後、樹脂硬化用の紫外線照射装置50を用いて、紫外線硬化樹脂42’に紫外線を照射することにより、紫外線硬化樹脂42’を硬化させて外側樹脂被覆部42を形成すると共に、嫌気性硬化樹脂41’を硬化させて内側樹脂被覆部41を形成する(図3(d))。紫外線硬化樹脂42’が硬化することにより、その内部の嫌気性硬化樹脂41’が空気遮断され、芯線圧着部24−導体31a間及び複数の導体31a,31a間に充てんされた嫌気性硬化樹脂41’が全て硬化される。また、紫外線硬化樹脂とは異なり、芯線端部31Aの中心部付近の隙間や、芯線圧着部24のバレル底部24Aと導体31aとの間の隙間など、上方から照射される紫外線が到達しにくい部位に充てんされた樹脂を容易に硬化させることができる。このように形成された樹脂被覆部4では、内部が嫌気性硬化樹脂によって密に充てんされ、且つその外周部が電線圧着部22及び紫外線硬化樹脂によって密閉された構造となり、電線圧着部22と電線端部3aとの接続部が確実に封止される。   Thereafter, the ultraviolet curable resin 42 'is irradiated with ultraviolet rays using the resin curing ultraviolet irradiation device 50 to cure the ultraviolet curable resin 42' to form the outer resin coating portion 42, and an anaerobic curable resin. 41 'is hardened and the inner side resin coating | coated part 41 is formed (FIG.3 (d)). When the ultraviolet curable resin 42 ′ is cured, the anaerobic curable resin 41 ′ inside the air is cut off, and the anaerobic curable resin 41 filled between the core wire crimping portion 24 and the conductor 31 a and between the plurality of conductors 31 a and 31 a is filled. 'Is all cured. Further, unlike the ultraviolet curable resin, a portion where the ultraviolet rays irradiated from above are difficult to reach such as a gap near the center of the core wire end portion 31A and a gap between the barrel bottom portion 24A of the core wire crimping portion 24 and the conductor 31a. The resin filled in can be easily cured. In the resin coating part 4 formed in this way, the inside is densely filled with an anaerobic curable resin, and the outer peripheral part is sealed with the wire crimping part 22 and the ultraviolet curable resin. The connection portion with the end portion 3a is securely sealed.

上述したように、本実施形態によれば、接続構造体1は、電線圧着部22に形成され且つ電線端部3Aの絶縁被覆を剥いだ芯線端部31Aを被覆する樹脂被覆部4を備える。そして、樹脂被覆部4は、電線圧着部22−導体3a間及び/又は複数の導体31a、31a間に充てんされ、嫌気性硬化樹脂からなる内側樹脂被覆部41と、電線圧着部22と協働して当該内側樹脂被覆部41を密閉するように形成され、紫外線硬化樹脂からなる外側樹脂被覆部42とを有する。本構成により、外側樹脂被覆部42を形成する紫外線硬化樹脂42’が硬化することにより内部が密閉状態となり、内側樹脂被覆部41を形成する嫌気性硬化樹脂41’が空気と遮断されて硬化する。これにより、内側樹脂被覆部41の樹脂硬化のばらつきを抑制して良好な封止を実現することができ、様々な使用環境下においても優れた防食性を発揮することができる。また、樹脂被覆部4における紫外線硬化樹脂42の量が従来に比べて少ないため、短い紫外線照射時間で、外側の紫外線硬化樹脂のみならず、内側の嫌気性硬化樹脂を硬化させることができ、生産性に優れた接続構造体を提供することが可能となる。   As described above, according to the present embodiment, the connection structure 1 includes the resin coating portion 4 that covers the core wire end portion 31A that is formed on the wire crimping portion 22 and from which the insulation coating of the wire end portion 3A is peeled off. The resin coating portion 4 is filled between the wire crimping portion 22 and the conductor 3a and / or between the plurality of conductors 31a and 31a, and cooperates with the inner resin coating portion 41 made of anaerobic curable resin and the wire crimping portion 22. Then, the inner resin coating portion 41 is formed so as to be sealed, and has an outer resin coating portion 42 made of an ultraviolet curable resin. With this configuration, the ultraviolet curable resin 42 ′ that forms the outer resin coating portion 42 is cured, so that the inside is sealed, and the anaerobic curable resin 41 ′ that forms the inner resin coating portion 41 is blocked from air and cured. . Thereby, the dispersion | variation in the resin hardening of the inner side resin coating | coated part 41 can be suppressed, favorable sealing can be implement | achieved, and the anticorrosion property excellent also in various use environments can be exhibited. In addition, since the amount of the ultraviolet curable resin 42 in the resin coating portion 4 is smaller than that in the past, not only the outer ultraviolet curable resin but also the inner anaerobic curable resin can be cured in a short ultraviolet irradiation time. It is possible to provide a connection structure having excellent properties.

また、上記接続構造体1において、電線圧着部22と電線端部3aとの接続部が樹脂被覆部4によって良好に封止されているか否かを検査できる構成とすることができる。例えば上記接続構造体1の変形例として、嫌気性硬化樹脂に、所定波長の光を受光して発光する第1発光材を含有させ、また、紫外線硬化樹脂に、上記所定波長とは異なる他の波長の光を受光して発光する第2発光材を含有させてなる樹脂被覆部4’を用いることができる。発光材を含有する嫌気性硬化樹脂及び紫外線硬化樹脂を用いた場合にも、上記と同様の方法にて、内側樹脂被覆部41及び外側樹脂被覆部42を形成することができる。   Moreover, in the said connection structure 1, it can be set as the structure which can test | inspect whether the connection part of the electric wire crimping part 22 and the electric wire edge part 3a is sealed favorably by the resin coating part 4. FIG. For example, as a modification of the connection structure 1, the anaerobic curable resin contains a first light-emitting material that receives and emits light of a predetermined wavelength, and the ultraviolet curable resin has a different wavelength from the predetermined wavelength. It is possible to use a resin coating portion 4 ′ containing a second light emitting material that receives light of a wavelength and emits light. Even when an anaerobic curable resin and an ultraviolet curable resin containing a luminescent material are used, the inner resin coated portion 41 and the outer resin coated portion 42 can be formed by the same method as described above.

樹脂被覆部4’の封止状態を検査する際には、図4に示すように、検査用の紫外線を照射する検査用紫外線照射装置60と、発光材からの励起光を受光する受光装置61とを用いることができる。この検査方法では、検査用紫外線照射装置60から所定波長の紫外線U2−1を励起光として樹脂被覆部4に照射し、内側樹脂被覆部41に含まれる第1発光材のみから蛍光F−1(あるいは燐光)を発光させる。そして、この蛍光F−1を受光装置61で受光して発光位置や光強度を検知し、該測定結果に基づいて、内側樹脂被覆部41、すなわち嫌気性硬化樹脂の充てん状態或いは被覆状態を判定する。また、検査用紫外線照射装置60から紫外線U2−1と異なる波長の紫外線U2−2を樹脂被覆部4に照射して、外側樹脂被覆部42に含まれる発光材のみから蛍光F−2を発光させる。そして内側樹脂被覆部41と同様、この蛍光F−2を受光装置61で受光して発光位置や光強度を検知し、該測定結果に基づいて外側樹脂被覆部42、すなわち紫外線硬化樹脂の被覆状態を判定する。このように、内側樹脂被覆部41及び外側樹脂被覆部42のそれぞれの充てん・被覆状態を発光材を用いて検査することにより、良好な封止が施された接続構造体4’のみを判別することが可能となる。   When inspecting the sealing state of the resin coating portion 4 ′, as shown in FIG. 4, the inspection ultraviolet irradiation device 60 for irradiating the inspection ultraviolet light and the light receiving device 61 for receiving the excitation light from the light emitting material. And can be used. In this inspection method, ultraviolet rays U2-1 having a predetermined wavelength are irradiated as excitation light from the ultraviolet irradiation device for inspection 60 to the resin coating portion 4, and the fluorescence F-1 (only from the first light-emitting material included in the inner resin coating portion 41 is obtained. Alternatively, phosphorescence is emitted. And this fluorescence F-1 is light-received with the light-receiving device 61, a light emission position and light intensity are detected, and the filling state or covering state of the inner side resin coating | coated part 41, ie, anaerobic hardening resin, is determined based on this measurement result. To do. Moreover, the ultraviolet-ray U2-2 of the wavelength different from the ultraviolet-ray U2-1 is irradiated to the resin coating part 4 from the test | inspection ultraviolet irradiation device 60, and fluorescence F-2 is light-emitted only from the luminescent material contained in the outer side resin coating part 42. . Similarly to the inner resin coating portion 41, the fluorescent light F-2 is received by the light receiving device 61 to detect the light emission position and light intensity, and based on the measurement result, the outer resin coating portion 42, that is, the ultraviolet curable resin coating state. Determine. In this way, only the connection structure 4 ′ with good sealing is discriminated by inspecting the filling and covering states of the inner resin coating portion 41 and the outer resin coating portion 42 using the light emitting material. It becomes possible.

図5(a)〜(b)は、図2(a)の接続構造体1の変形例を示す長手方向断面図である。
図5(a)に示すように、接続構造体1Aは、トランジション部23と電線圧着部22との間に、幅方向Yに沿って端子2の幅全体に亘って形成された堰部70を有している。この堰部70は、端子2の内面2aに固定されるものであれば、材質或いは形状は問わないが、例えば断面略矩形の樹脂で形成される。堰部70の形成方法としては、例えば金属基体からなる板材に、必要な場合にはめっき加工を施した後、打ち抜き加工を施して複数の端子が平面展開した状態となるように繰り返し形状で打ち抜き、繰り返し形状の構成単位となる各板状部位に曲げ加工を施して端子1を形成した後、端子1に樹脂を塗布することができる。このような堰部70を設けることにより、硬化前の嫌気性硬化樹脂41’及び紫外線硬化樹脂42’が堰部70によって堰き止められ、トランジション部23側に流れ出すのを確実に防止することができる。
FIGS. 5A to 5B are longitudinal sectional views showing modifications of the connection structure 1 shown in FIG.
As shown in FIG. 5A, the connection structure 1 </ b> A includes a weir portion 70 formed across the entire width of the terminal 2 along the width direction Y between the transition portion 23 and the wire crimping portion 22. Have. The dam portion 70 is formed of a resin having a substantially rectangular cross section, for example, as long as it is fixed to the inner surface 2a of the terminal 2, although the material or the shape is not limited. As a method for forming the weir portion 70, for example, a plate material made of a metal substrate is subjected to a plating process if necessary, and then subjected to a punching process so that a plurality of terminals are punched in a repetitive shape so as to be flattened. After the terminal 1 is formed by bending each plate-like portion that is a structural unit having a repetitive shape, a resin can be applied to the terminal 1. By providing such a dam portion 70, it is possible to reliably prevent the anaerobic curable resin 41 ′ and the ultraviolet curable resin 42 ′ before curing from being blocked by the dam portion 70 and flowing out to the transition portion 23 side. .

また、図5(b)に示すように、トランジション部23と電線圧着部22との間に、幅方向Yに沿って端子2の幅全体に亘って形成された溝部71を有していてもよい。溝部71の形成方法としては、例えば金属基体からなる板材に、必要な場合にはめっき加工を施した後、板材の圧延方向に沿ってプレス加工を施して溝部を形成し、さらに打ち抜き加工を施して複数の端子が平面展開した状態となるように繰り返し形状で打ち抜き、繰り返し形状の構成単位となる各板状部位に曲げ加工を施して端子1を形成することができる。このような溝部71を設けることにより、硬化前の嫌気性硬化樹脂41’及び紫外線硬化樹脂42’が流れ出た場合であっても溝部71内に樹脂を受容することができ、トランジション部23側に流れ出すのを防止することができる。   Moreover, as shown in FIG.5 (b), even if it has the groove part 71 formed over the whole width | variety of the terminal 2 along the width direction Y between the transition part 23 and the electric wire crimping | compression-bonding part 22 Good. As a method of forming the groove portion 71, for example, a plate material made of a metal substrate is subjected to plating if necessary, and then pressed along the rolling direction of the plate material to form a groove portion, and further subjected to punching processing. Thus, the terminal 1 can be formed by punching in a repetitive shape so that a plurality of terminals are in a flattened state, and bending each plate-like portion that is a structural unit of the repetitive shape. By providing such a groove portion 71, the resin can be received in the groove portion 71 even when the anaerobic curable resin 41 ′ and the ultraviolet curable resin 42 ′ before curing flow out, and on the transition portion 23 side. It can be prevented from flowing out.

図6は、図2(a)の接続構造体の他の変形例を示す長手方向断面図である。通常、芯線端部31Aの端面は、図2(b)に示すように長手方向に対して略垂直な面であり、その角隅部は略直角形状であるが、圧着時の押圧力により、導体31aの一部が導体圧着部24Lから側方に飛び出して端面31A−2に突起110が形成される場合がある。このような突起110が芯線端部31Aの端面31A−2に形成されていると、突起110を樹脂被覆部で覆うことができず、良好な封止を施すことができない場合がある。   FIG. 6 is a longitudinal sectional view showing another modification of the connection structure of FIG. Usually, the end surface of the core wire end portion 31A is a surface substantially perpendicular to the longitudinal direction as shown in FIG. 2 (b), and its corners are substantially right-angled, but due to the pressing force during crimping, A part of the conductor 31a may protrude laterally from the conductor crimping portion 24L, and the protrusion 110 may be formed on the end surface 31A-2. If such a projection 110 is formed on the end surface 31A-2 of the core wire end portion 31A, the projection 110 cannot be covered with the resin coating portion, and good sealing may not be performed.

そこで、図6(b)に示すように、接続構造体の長手方向断面において、芯線端部31Aの端面31A−2をバレル片24Lの端面24L−1よりも内側に配置し、芯線端部3Aが芯線圧着部24からトランジション部23側に突出しない位置で、芯線圧着部24と芯線端部31Aとを圧着する。このような配置とすることにより、圧着時に端面31A−2に突起が形成されることがなく、良好な封止を施すことできる。また、芯線圧着部24の内側空間に嫌気性硬化樹脂41’の液溜まり部80を設けることができ、当該液溜まり部に嫌気性硬化樹脂からなる端面封止部81を形成することができる(図6(c))。これにより、複数の導体31a,31a・・・の長手方向端面位置にばらつきが生じた場合であっても、芯線端部31Aの端面31A−2を確実に被覆することができる。   Therefore, as shown in FIG. 6B, in the longitudinal cross section of the connection structure, the end surface 31A-2 of the core wire end portion 31A is disposed on the inner side of the end surface 24L-1 of the barrel piece 24L, and the core wire end portion 3A. Is crimped to the core wire crimping portion 24 and the core wire end portion 31A at a position that does not protrude from the core wire crimping portion 24 to the transition portion 23 side. With such an arrangement, no protrusions are formed on the end surface 31A-2 at the time of pressure bonding, and good sealing can be performed. Further, the liquid reservoir 80 of the anaerobic curable resin 41 ′ can be provided in the inner space of the core wire crimping portion 24, and the end surface sealing portion 81 made of the anaerobic curable resin can be formed in the liquid reservoir ( FIG. 6 (c)). Thereby, even if it is a case where dispersion | variation arises in the longitudinal direction end surface position of several conductor 31a, 31a ..., end surface 31A-2 of core wire end part 31A can be reliably coat | covered.

以上、本発明の実施形態に係る接続構造体およびその製造方法について述べたが、本発明は記述の実施形態に限定されるものではなく、本発明の技術思想に基づいて各種の変形および変更が可能である。   The connection structure and the manufacturing method thereof according to the embodiment of the present invention have been described above, but the present invention is not limited to the described embodiment, and various modifications and changes can be made based on the technical idea of the present invention. Is possible.

例えば上記実施形態では、端子のコネクタ部が雌型端子であるが、コネクタ部の細部の形状は、特に限定されず、外部端子と係止あるいは嵌合して電気的に接続し得るものであれば、他の形状を有していてもよい。例えば図7に示すように、接続構造体90は、電線圧着部22と平板状のトランジション部91を介して一体接続され、中央の孔92にボルト等が挿通されて他の部材に固定される丸型端子93を有していてもよい。また、接続構造体が、コネクタ部として、雄型端子の長尺状の接続部(挿入タブ)を有する構造であってもよい。   For example, in the above embodiment, the connector portion of the terminal is a female terminal, but the shape of the details of the connector portion is not particularly limited, and can be electrically connected by locking or fitting with an external terminal. For example, it may have other shapes. For example, as shown in FIG. 7, the connection structure 90 is integrally connected to the wire crimping portion 22 via a flat plate-like transition portion 91, and a bolt or the like is inserted into the central hole 92 and fixed to another member. A round terminal 93 may be provided. In addition, the connection structure may have a structure in which a long connection portion (insertion tab) of a male terminal is used as a connector portion.

また上記実施形態では、芯線が複数の導体からなるが、これに限らず、複数の芯線が撚り合わされてなる撚線であってもよいし、1本の導体であってもよい。また、本実施形態の接続構造体は、細物電線、中細電線、及び太物電線のいずれにも適用することができ、特に太物電線に好適に使用される。   Moreover, in the said embodiment, although a core wire consists of several conductors, it is not restricted to this, The twisted wire by which several core wires are twisted together may be sufficient, and one conductor may be sufficient. Moreover, the connection structure of this embodiment can be applied to any of a thin wire, a medium thin wire, and a thick wire, and is particularly preferably used for a thick wire.

また上記実施形態では、電線圧着部は、芯線圧着部と被覆圧着部の双方を有しているが、これに限らず、被覆圧着部(インシュレーションバレル)を有さず、芯線圧着部のみを有していてもよい。また、上記実施形態では、芯線圧着部と被覆圧着部が二組のバレル片で形成されているが、これに限らず、芯線圧着部と被覆圧着部の双方が一組のバレル片に設けられてもよい。   Moreover, in the said embodiment, although the electric wire crimping | compression-bonding part has both a core crimping | compression-bonding part and a covering crimping | compression-bonding part, it does not have a covering crimping | compression-bonding part (insulation barrel) but only a core crimping | compression-bonding part. You may have. Moreover, in the said embodiment, although the core wire crimping | compression-bonding part and the covering crimping | compression-bonding part are formed with two sets of barrel pieces, not only this but both a core wire crimping part and a covering crimping | compression-bonding part are provided in one set of barrel pieces. May be.

また、上記実施形態の接続構造体を少なくとも1つ有するワイヤハーネスを構成してもよい。   Moreover, you may comprise the wire harness which has at least 1 connection structure of the said embodiment.

本発明の接続構造体は、自動車、OA機器、家電製品等の各分野で用いられる電力線として使用することができ、特に電気自動車、ハイブリッド自動車等に搭載されるコンバータなどの装置の電力線として好適である。   The connection structure of the present invention can be used as a power line used in various fields such as automobiles, OA equipment, and home appliances, and is particularly suitable as a power line for devices such as converters mounted on electric cars, hybrid cars, and the like. is there.

1 接続構造体
2 端子
2a 内面
3 電線
3a 電線端部
4 樹脂被覆部
4’ 樹脂被覆部
21 コネクタ部
22 電線圧着部
23 トランジション部
24 芯線圧着部
24A バレル底部
24R,24L バレル片
24L−1 露出面
25 被覆圧着部
25A バレル底部
25R,25L バレル片
25L−1 露出面
31a 導体
31 芯線
31A 芯線端部
31A−1 露出面
31A−2 端面
32 絶縁被覆
41 内側樹脂被覆部
41’ 嫌気性硬化樹脂
41’−1 露出面
42 外側樹脂被覆部
42’ 紫外線硬化樹脂
50 樹脂硬化用紫外線照射装置
60 検査用紫外線照射装置
61 受光装置
70 堰部
71 溝部
80 液溜まり部
81 端面封止部
90 接続構造体
91 トランジション部
92 孔
93 丸型端子
U2−1 紫外線
U2−2 紫外線
F−1 蛍光
F−2 蛍光
DESCRIPTION OF SYMBOLS 1 Connection structure 2 Terminal 2a Inner surface 3 Electric wire 3a Electric wire edge part 4 Resin coating | coated part 4 'Resin coating | coated part 21 Connector part 22 Electric wire crimping part 23 Transition part 24 Core wire crimping part 24A Barrel bottom part 24R, 24L Barrel piece 24L-1 Exposed surface 25 Covering pressure bonding part 25A Barrel bottom part 25R, 25L Barrel piece 25L-1 Exposed surface 31a Conductor 31 Core wire 31A Core wire end part 31A-1 Exposed surface 31A-2 End surface 32 Insulation coating 41 Inner resin coating part 41 'Anaerobic cured resin 41' -1 Exposed surface 42 Outer resin coating 42 'UV curable resin 50 UV curing device for resin curing 60 UV irradiation device for inspection 61 Light receiving device 70 Weir portion 71 Groove portion 80 Liquid reservoir portion 81 End surface sealing portion 90 Connection structure 91 Transition Portion 92 Hole 93 Round terminal U2-1 Ultraviolet U2-2 Ultraviolet F-1 Fluorescence F-2 Fluorescence

Claims (7)

外部端子と電気的に接続されるコネクタ部と、該コネクタ部と連結され且つ電線端部と圧着される電線圧着部とを有する端子と、
一又は複数の導体からなる芯線と、該芯線を被覆する絶縁被覆とを有する電線と、
前記電線圧着部に形成され、少なくとも前記電線端部の絶縁被覆を剥いだ芯線端部を被覆する樹脂被覆部と、で構成される接続構造体であって、
前記樹脂被覆部は、前記電線圧着部−前記導体間及び前記複数の導体間の双方に充てんされ、嫌気性硬化樹脂からなる第1樹脂被覆部と、前記電線圧着部と協働して当該第1樹脂被覆部を密閉するように形成され、紫外線硬化樹脂からなる第2樹脂被覆部と、を有することを特徴とする、接続構造体。
A terminal having a connector part electrically connected to the external terminal, and a wire crimping part connected to the connector part and crimped to the wire end;
An electric wire having a core wire made of one or a plurality of conductors and an insulating coating covering the core wire;
A connection structure formed by the resin crimping portion formed on the wire crimping portion and covering at least the core wire end portion from which the insulation coating of the wire end portion has been peeled,
The resin coating portion is filled in both the wire crimping portion and the conductors and between the plurality of conductors, and cooperates with the first resin coating portion made of anaerobic curable resin and the wire crimping portion. 1. A connection structure comprising: a second resin coating portion formed to seal the resin coating portion and made of an ultraviolet curable resin.
前記紫外線硬化樹脂の硬化前粘度が、前記嫌気性硬化樹脂の硬化前粘度よりも高いことを特徴とする、請求項1記載の接続構造体。   The connection structure according to claim 1, wherein the pre-curing viscosity of the ultraviolet curable resin is higher than the pre-curing viscosity of the anaerobic curable resin. 前記嫌気性硬化樹脂の硬化前粘度が、25℃で10mPa・s〜1000mPa・sであることを特徴とする、請求項1又は2記載の接続構造体。   The connection structure according to claim 1 or 2, wherein a viscosity before curing of the anaerobic curable resin is 10 mPa · s to 1000 mPa · s at 25 ° C. 前記嫌気性硬化樹脂が、嫌気硬化特性及び紫外線硬化特性の双方を有することを特徴とする、請求項1記載の接続構造体。   The connection structure according to claim 1, wherein the anaerobic curable resin has both anaerobic curing characteristics and ultraviolet curing characteristics. 前記端子が、銅又は銅合金からなり、
前記電線の芯線が、アルミニウム又はアルミニウム合金からなることを特徴とする、請求項1乃至4のいずれか1項に記載の接続構造体。
The terminal is made of copper or a copper alloy,
The connection structure according to any one of claims 1 to 4, wherein the core wire of the electric wire is made of aluminum or an aluminum alloy.
請求項1乃至5のいずれか1項に記載の接続構造体を少なくとも1つ備える、ワイヤハーネス。   A wire harness comprising at least one connection structure according to any one of claims 1 to 5. 外部端子と電気的に接続されるコネクタ部と、該コネクタ部と連結され且つ電線端部と圧着される電線圧着部とを備える端子を、電線の絶縁被覆を剥いだ芯線端部に圧着し、更に電線圧着部を樹脂で被覆することにより得られる接続構造体の製造方法であって、
前記電線圧着部−前記導体間及び前記複数の導体間の双方に嫌気性硬化樹脂を充てんする工程と、
前記嫌気性硬化樹脂を紫外線硬化樹脂で覆い、前記電線圧着部と協働して前記嫌気性硬化樹脂を密閉する工程と、
前記紫外線硬化樹脂に紫外線を照射することにより、前記紫外線硬化樹脂を硬化させて第2樹脂被覆部を形成すると共に、前記嫌気性硬化樹脂を硬化させて第1樹脂被覆部を形成する工程と、を有することを特徴とする、接続構造体の製造方法。
Crimp a terminal provided with a connector part electrically connected to the external terminal, and a wire crimping part connected to the connector part and crimped to the wire end, to the end part of the core wire from which the insulation coating of the electric wire has been peeled off, Furthermore, it is a method for manufacturing a connection structure obtained by coating the wire crimping portion with a resin,
A step of filling anaerobic curable resin between both the wire crimping portion and the conductors and between the conductors;
Covering the anaerobic curable resin with an ultraviolet curable resin and sealing the anaerobic curable resin in cooperation with the wire crimping portion;
Irradiating the ultraviolet curable resin with ultraviolet rays to cure the ultraviolet curable resin to form a second resin coating portion and curing the anaerobic curable resin to form a first resin coating portion; A method for manufacturing a connection structure, comprising:
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