JP2011165618A - Wire with terminal - Google Patents

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JP2011165618A
JP2011165618A JP2010030317A JP2010030317A JP2011165618A JP 2011165618 A JP2011165618 A JP 2011165618A JP 2010030317 A JP2010030317 A JP 2010030317A JP 2010030317 A JP2010030317 A JP 2010030317A JP 2011165618 A JP2011165618 A JP 2011165618A
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terminal
conductor
connection
electric wire
connection portion
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JP5458931B2 (en
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Hideyuki Sagawa
英之 佐川
Toshiyuki Horikoshi
稔之 堀越
Hiromitsu Kuroda
洋光 黒田
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Hitachi Cable Ltd
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Hitachi Cable Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive wire with a terminal which prevents galvanic corrosion generated when a terminal and a conductor formed of different types of metal materials are connected to each other, and has excellent connection strength and connection resistance. <P>SOLUTION: In the wire with the terminal including the terminal 4, and the wire 1 formed with an insulation layer 3 on a conductor 2 formed of a metal material different from that of the terminal 4 where the terminal 4 is connected to the conductor 2, a conductive anticorrosion layer 10 formed of Ti or a Ti alloy is formed on a surface of the terminal 4 for connecting the conductor 2 thereto. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、自動車で使用される電線の導体に端子が接続された端子付き電線に係り、特に、Cu端子にAl導体を接続した接続部に発生するガルバニック腐食を防止できる端子付き電線に関するものである。   The present invention relates to an electric wire with a terminal in which a terminal is connected to a conductor of an electric wire used in an automobile, and more particularly to an electric wire with a terminal that can prevent galvanic corrosion occurring at a connection portion in which an Al conductor is connected to a Cu terminal. is there.

従来より、電気自動車やハイブリッド車などの自動車に使用される電線においては、軽量化のために、導体にアルミ(Al)を用いたアルミ電線(Al電線)が使用されており、そのAl電線を各種電気機器に接続する端子には、銅(Cu)或いはCu合金が使用されている。   Conventionally, in order to reduce the weight of an electric wire used in an automobile such as an electric vehicle or a hybrid vehicle, an aluminum electric wire (Al electric wire) using aluminum (Al) as a conductor has been used. Copper (Cu) or Cu alloy is used for the terminals connected to various electric devices.

ところで、CuとAlが接触した部材を、腐食環境下で使用した場合、特に、自動車や屋外電気機器のように、雨水にさらされたり、あるいは結露が生じやすい環境では、異種金属接触腐食(ガルバニック腐食)の問題が発生する。   By the way, when a member in which Cu and Al are in contact with each other is used in a corrosive environment, especially in an environment where it is exposed to rain water or is likely to cause dew condensation, such as automobiles and outdoor electrical equipment, Corrosion) occurs.

Cu端子付きAl電線の場合もその一例であり、Cu端子とAl導体との接続部が露出されたまま腐食環境下にさらされると、加速度的にAl導体の腐食(溶解或いは、腐食生成物の形成)が進行し、導電率の低下及び接続強度の著しい低下を引き起こす。   An example of the case of an Al electric wire with a Cu terminal is one example. When exposed to a corrosive environment with the connection portion between the Cu terminal and the Al conductor exposed, the Al conductor is corroded at an accelerated rate (dissolution or corrosion product). Formation), causing a decrease in conductivity and a significant decrease in connection strength.

この対策として、Cu端子とAl導体との接続部を、熱収縮チューブなど、耐腐食性の樹脂材料で覆う方法が一般的に行われている。腐食環境を遮断する熱収縮チューブによるこの対策では、部品点数が増えることにより材料コストの上昇及び加工コストの上昇が発生する。また、樹脂材料は、自動車用途など、高電流、高温環境で使用するのに十分な耐熱性を有しておらず、長期信頼性の面で不安がある。更に、樹脂材料は、配線スペース等の関係で、その厚さを厚くすることができない場合、振動などによって損傷し十分な耐腐食性を発揮できない可能性もある。   As a countermeasure, a method of covering the connection portion between the Cu terminal and the Al conductor with a corrosion-resistant resin material such as a heat shrinkable tube is generally performed. In this countermeasure by the heat shrinkable tube that blocks the corrosive environment, the increase in the number of parts increases the material cost and the processing cost. In addition, resin materials do not have sufficient heat resistance to be used in high current and high temperature environments such as automotive applications, and there is concern about long-term reliability. Furthermore, if the thickness of the resin material cannot be increased due to the wiring space or the like, the resin material may be damaged by vibration or the like and may not exhibit sufficient corrosion resistance.

そこで、特許文献1〜3に示されるように、次のような技術が提案されている。   Therefore, as shown in Patent Documents 1 to 3, the following techniques have been proposed.

特許文献1では、Cu端子とAl導体の接続において、Cu端子の接続面以外の表面に錫めっきを施し、Alの露出面積に対するCuの露出面積を小さくすることで、ガルバニック腐食の抑制を図っている。   In Patent Document 1, in connection between the Cu terminal and the Al conductor, tin plating is applied to the surface other than the connection surface of the Cu terminal, and the exposed area of Cu with respect to the exposed area of Al is reduced, thereby suppressing galvanic corrosion. Yes.

特許文献2では、Cu端子とAl導体の接続において、撚線に接するCu端子部分にAlを主成分とするAl層を設けることで、ガルバニック腐食の防止を図っている。   In Patent Document 2, galvanic corrosion is prevented by providing an Al layer mainly composed of Al at the Cu terminal portion in contact with the stranded wire in the connection between the Cu terminal and the Al conductor.

特許文献3では、異種金属からなる端子と導体との接続において、導体端末部の露出した芯線に、金属キャップを被覆し、この金属キャップを包囲するようにカシメ片を圧着することで、ガルバニック腐食の防止を図っている。   In Patent Document 3, when connecting a terminal made of a dissimilar metal and a conductor, a galvanic corrosion is formed by covering the exposed core wire of the conductor end with a metal cap and crimping a caulking piece so as to surround the metal cap. To prevent this.

特開2005−108608号公報JP 2005-108608 A 特開2007−12329号公報JP 2007-12329 A 特開2007−311369号公報JP 2007-31369 A

しかしながら、上記特許文献1〜3に記載される従来の端子付き電線では、解決すべき以下の問題点がある。   However, the conventional electric wires with terminals described in Patent Documents 1 to 3 have the following problems to be solved.

特許文献1では、面積効果を利用してガルバニック腐食の防止を図っているが、ガルバニック腐食の程度は軽減されるものの、実接触面は依然CuとAlであるため、ガルバニック腐食の根本的な解決とはなり得ず、接続強度の信頼性が低下してしまう。   In Patent Document 1, the area effect is used to prevent galvanic corrosion. However, although the degree of galvanic corrosion is reduced, the actual contact surface is still Cu and Al. And the reliability of the connection strength is reduced.

特許文献2では、Al導体のCu端子との接続面がAl層であるため、接続部のガルバニック腐食の防止は可能である。しかしながら、端子自体がCuとAlで構成されるため、端子内のCu/Al界面で発生するガルバニック腐食は防ぐことができない。また、電気接触部の片面はAlであるため、接続抵抗の上昇の問題がある。   In patent document 2, since the connection surface with the Cu terminal of Al conductor is an Al layer, the galvanic corrosion of a connection part can be prevented. However, since the terminal itself is made of Cu and Al, galvanic corrosion that occurs at the Cu / Al interface in the terminal cannot be prevented. Moreover, since one side of the electrical contact portion is Al, there is a problem of an increase in connection resistance.

特許文献3では、ガルバニック腐食防止用の金属キャップを必要とするため、部材点数が多くなり、また、それにより圧着工程も増加するため、コストが高くなるという問題がある。   In Patent Document 3, since a metal cap for preventing galvanic corrosion is required, the number of members is increased, and the crimping process is increased thereby, resulting in an increase in cost.

そこで本発明の目的は、上記問題を解決し、異種の金属材料からなる端子と導体とを接続した際に発生するガルバニック腐食を防止し、低コストで、かつ、優れた接続強度及び接続抵抗を有する端子付き電線を提供することにある。   Therefore, an object of the present invention is to solve the above problems, prevent galvanic corrosion that occurs when a terminal and a conductor made of different kinds of metal materials are connected, and at low cost, with excellent connection strength and connection resistance. It is providing the electric wire with a terminal which has.

上記目的を達成すべく請求項1の発明は、端子と、該端子と異なる金属材料からなる導体上に絶縁層が形成されている電線とを備え、前記端子と前記導体が接続されている端子付き電線において、前記端子は、前記導体が接続される面に、TiあるいはTi合金からなる導電防食層が形成されていることを特徴とする端子付き電線である。   In order to achieve the above object, the invention of claim 1 is provided with a terminal and an electric wire having an insulating layer formed on a conductor made of a metal material different from the terminal, and the terminal and the conductor are connected to each other. In the attached electric wire, the terminal is an electric wire with a terminal, wherein a conductive anticorrosion layer made of Ti or a Ti alloy is formed on a surface to which the conductor is connected.

請求項2の発明は、端子と、該端子と異なる金属材料からなる導体上に絶縁層が形成されている電線とを備え、前記端子と前記導体が接続されている端子付き電線において、前記端子は、前記導体が接続される面に、NiあるいはNi合金からなる導電防食層が形成されていることを特徴とする端子付き電線である。   The invention of claim 2 includes a terminal and an electric wire having an insulating layer formed on a conductor made of a metal material different from the terminal, and the terminal and the electric wire with a terminal to which the conductor is connected. Is an electric wire with a terminal, characterized in that a conductive anticorrosion layer made of Ni or Ni alloy is formed on the surface to which the conductor is connected.

請求項3の発明は、前記Ti合金は、Tiに、Fe、Cu、Ni、Mn、Mg、Mo、Zn、Zrのうちから選ばれる1種以上を含む合金からなる請求項1に記載の端子付き電線である。   The invention according to claim 3 is the terminal according to claim 1, wherein the Ti alloy is made of an alloy containing at least one selected from Fe, Cu, Ni, Mn, Mg, Mo, Zn, and Zr. It is an attached electric wire.

請求項4の発明は、前記Ni合金は、Niに、Si、Fe、Cu、Mn、Mg、Mo、Zn、Ti、P、Bのうちから選ばれる1種以上を含む合金からなる請求項2に記載の端子付き電線である。   According to a fourth aspect of the present invention, the Ni alloy is made of an alloy containing at least one selected from Si, Fe, Cu, Mn, Mg, Mo, Zn, Ti, P, and B in Ni. It is an electric wire with a terminal of description.

請求項5の発明は、前記端子は、CuあるいはCuに、Si、Fe、Ni、Mn、Mg、Mo、Zn、Ti、Pのうちから選ばれる1種以上を含むCu合金からなる請求項1乃至4のいずれかに記載の端子付き電線である。   According to a fifth aspect of the present invention, the terminal is made of Cu or Cu and a Cu alloy containing at least one selected from Si, Fe, Ni, Mn, Mg, Mo, Zn, Ti, and P. It is an electric wire with a terminal given in either of thru / or 4.

請求項6の発明は、前記導体は、AlあるいはAlに、Si、Fe、Ni、Mn、Mg、Zn、Tiのうちから選ばれる1種以上を含むAl合金からなる請求項1乃至4のいずれかに記載の端子付き電線である。   The invention according to claim 6 is the conductor according to any one of claims 1 to 4, wherein the conductor is made of Al or Al alloy containing at least one selected from Si, Fe, Ni, Mn, Mg, Zn, and Ti. It is an electric wire with a terminal of crab.

本発明によれば、異種の金属材料からなる端子と導体とを接続した際に発生するガルバニック腐食を防止し、低コストで、かつ、優れた接続強度及び接続抵抗を有する端子付き電線を提供することができる。   According to the present invention, it is possible to provide a terminal-attached electric wire that prevents galvanic corrosion that occurs when a terminal and a conductor made of different metal materials are connected, has low connection cost, and has excellent connection strength and connection resistance. be able to.

本発明の第1の実施の形態を示し、端子と電線を接続する前の外観斜視図である。BRIEF DESCRIPTION OF THE DRAWINGS It is an external appearance perspective view before showing the 1st Embodiment of this invention and connecting a terminal and an electric wire. 図1の端子と電線を接続した後の外観斜視図である。It is an external appearance perspective view after connecting the terminal and electric wire of FIG. 本発明の第2の実施の形態を示し、端子と電線を接続する前の外観斜視図である。It is an external appearance perspective view before showing the 2nd Embodiment of this invention and connecting a terminal and an electric wire. 図3の端子と電線を接続した後の外観斜視図である。It is an external appearance perspective view after connecting the terminal and electric wire of FIG. 本発明の第3の実施の形態を示し、端子と電線を接続する前の外観斜視図である。It is an external appearance perspective view before showing a 3rd embodiment of the present invention and connecting a terminal and an electric wire. 図5の端子と電線を接続した後の外観斜視図である。It is an external appearance perspective view after connecting the terminal and electric wire of FIG. 従来の形態を示し、端子と電線を接続する前の外観斜視図である。It is an external appearance perspective view before showing a conventional form and connecting a terminal and an electric wire. 図7の端子と電線を接続した後の外観斜視図である。It is an external appearance perspective view after connecting the terminal and electric wire of FIG.

以下、本発明の好適な実施の形態を添付図面に基づいて詳述する。   Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

図1、図2は、本発明に係る端子付き電線とその製造方法の第1の実施の形態を示したものである。図1、図2において、1はケーブルなどから引き出された電線で、導体2とその導体2を被覆する絶縁層3とで構成される。導体2は多数のAl或いはAl合金からなる素線2aを撚り合わせて形成される。絶縁層3の材料には、ポリプロピレン樹脂、ポリ塩化ビニル樹脂、ポリエチレン樹脂、フッ素系樹脂などが用いられる。   1 and 2 show a first embodiment of an electric wire with a terminal and a manufacturing method thereof according to the present invention. In FIG. 1 and FIG. 2, reference numeral 1 denotes an electric wire drawn from a cable or the like, and is composed of a conductor 2 and an insulating layer 3 covering the conductor 2. The conductor 2 is formed by twisting a number of strands 2a made of Al or Al alloy. As a material of the insulating layer 3, polypropylene resin, polyvinyl chloride resin, polyethylene resin, fluorine resin, or the like is used.

電線1の端部に接続される端子4は、CuやCu合金などからなる板材を打ち抜いて形成された端子本体5から構成される。端子本体5の一方には、電気機器に接続される丸字形やY字形などの第一接続部6が形成され、他方には、電線1の端部に接続される第二接続部7が形成される。   The terminal 4 connected to the end of the electric wire 1 is composed of a terminal body 5 formed by punching a plate material made of Cu or Cu alloy. A first connection portion 6 such as a round shape or a Y shape is formed on one side of the terminal body 5, and a second connection portion 7 connected to the end portion of the electric wire 1 is formed on the other side. Is done.

第二接続部7は、第一接続部6から延びた長方形状の底面部8aと、底面部8aの幅方向(底面部8aの短手方向)の両辺に設けられた一対の接続片8bとで形成される。この一対の接続片8bを底面部8aに対して略90度ずつ折り曲げ、断面略U字形状にすることで、第二接続部7が形成される。   The second connection portion 7 includes a rectangular bottom surface portion 8a extending from the first connection portion 6, and a pair of connection pieces 8b provided on both sides in the width direction of the bottom surface portion 8a (short direction of the bottom surface portion 8a). Formed with. The pair of connection pieces 8b are bent by approximately 90 degrees with respect to the bottom surface portion 8a to form a substantially U-shaped cross section, whereby the second connection portion 7 is formed.

また、本実施の形態では、接続片8bに切欠部9を設けることで、第二接続部7に、電線1の導体2を接続する導体接続部7aと、電線1の絶縁層3を保持する絶縁層保持部7bが形成される。導体接続部7aは、電線1の導体2を接続した後のサイズに合わせるように、接続片8bを折り曲げて形成される。また、絶縁層保持部7bは、電線1の絶縁層3の外径と同じ大きさの幅となるように、接続片8bを折り曲げて形成される。さらに、切欠部9を設けた箇所の底面部8aは適宜曲げることが可能である。   Moreover, in this Embodiment, the conductor connection part 7a which connects the conductor 2 of the electric wire 1 and the insulating layer 3 of the electric wire 1 are hold | maintained to the 2nd connection part 7 by providing the notch part 9 in the connection piece 8b. The insulating layer holding part 7b is formed. The conductor connection portion 7a is formed by bending the connection piece 8b so as to match the size after the conductor 2 of the electric wire 1 is connected. Further, the insulating layer holding portion 7b is formed by bending the connection piece 8b so as to have the same width as the outer diameter of the insulating layer 3 of the electric wire 1. Furthermore, the bottom surface portion 8a where the notch portion 9 is provided can be appropriately bent.

第二接続部7の導体2と接続する面、つまり、導体接続部7aの表面には、Ni或いはNi合金、または、Ti或いはTi合金のいずれかからなる導電防食層10が形成される。なお、導電防食層10は、第一接続部6や絶縁層保持部7bの表面にも形成されていてもよい。   A conductive anticorrosion layer 10 made of Ni or Ni alloy, or Ti or Ti alloy is formed on the surface of the second connection portion 7 connected to the conductor 2, that is, the surface of the conductor connection portion 7a. The conductive anticorrosion layer 10 may also be formed on the surfaces of the first connection part 6 and the insulating layer holding part 7b.

導電防食層10は、端子形状に打ち抜く前のCuやCu合金などからなる板材と、Ni或いはNi合金、または、Ti或いはTi合金のいずれかを複合化して予め形成される。複合化の代表的な方法として、冷間或いは熱間圧延によるクラッド法、めっき法、スパッタ法などが適用可能であり、またこれに限るものではない。なお、導電防食層10は、CuやCu合金などからなる板材から端子本体5を打ち抜いた後にめっき法、スパッタ法などにより形成してもよい。   The conductive anticorrosion layer 10 is formed in advance by combining a plate material made of Cu or Cu alloy before being punched into a terminal shape, and Ni or Ni alloy, or Ti or Ti alloy. As a typical method of compounding, a clad method, a plating method, a sputtering method, or the like by cold or hot rolling can be applied, and the method is not limited to this. The conductive anticorrosion layer 10 may be formed by plating, sputtering, or the like after the terminal body 5 is punched from a plate material made of Cu, Cu alloy, or the like.

このように導電防食層10を複合化した板材から、端子形状に打ち抜き、接続片8bを曲げて第二接続部7を形成することで端子4が構成される。   Thus, the terminal 4 is comprised by punching in the shape of a terminal from the board | plate material which combined the electrically conductive anti-corrosion layer 10, and bending the connection piece 8b and forming the 2nd connection part 7. FIG.

端子本体5と導体2の材料の組み合わせとして、純Cu端子と純Al導体が適用可能である。また、その他、端子本体5の材料として、Cuに、Si、Fe、Ni、Mn、Mg、Mo、Zn、Ti、Pのうち選ばれた1種以上の元素を含むCu合金、導体2の材料として、Alに、Si、Fe、Ni、Mn、Mg、Zn、Tiのうち選ばれた1種以上の元素を含むAl合金などが適用可能である。   As a combination of the material of the terminal body 5 and the conductor 2, a pure Cu terminal and a pure Al conductor are applicable. In addition, as a material of the terminal body 5, a Cu alloy containing Cu and one or more elements selected from Si, Fe, Ni, Mn, Mg, Mo, Zn, Ti, and P, and a material of the conductor 2 As the Al, an Al alloy containing one or more elements selected from Si, Fe, Ni, Mn, Mg, Zn, and Ti can be used.

端子本体5に設けられた導電防食層10は、Niの他、Niに、Si、Fe、Cu、Mn、Mg、Mo、Zn、Ti、P、Bのうち選ばれた1種以上の元素を含むNi合金、或いは、Tiの他、Tiに、Fe、Cu、Ni、Mn、Mg、Mo、Zn、Zrのうち選ばれた1種以上の元素を含むTi合金の適用が可能である。   In addition to Ni, the conductive anticorrosion layer 10 provided on the terminal main body 5 includes one or more elements selected from Si, Fe, Cu, Mn, Mg, Mo, Zn, Ti, P, and B in addition to Ni. In addition to Ti, it is possible to apply a Ti alloy containing one or more elements selected from Fe, Cu, Ni, Mn, Mg, Mo, Zn, and Zr in addition to Ti.

端子本体5に設けられた導電防食層10のNiへの元素添加量として、Si,Fe,Mn,Mg,Zn,Tiは20mass%以下、Cu,Mo,P,Bは10mass%以下が望ましい。また、Tiの元素添加量としては、Fe,Ni,Mn,Mg,Znは20mass%以下、Cu,Mo,Zrは10mass%以下が望ましい。   As element addition amounts to Ni of the conductive anticorrosion layer 10 provided in the terminal body 5, Si, Fe, Mn, Mg, Zn, and Ti are desirably 20 mass% or less, and Cu, Mo, P, and B are desirably 10 mass% or less. Further, the addition amount of Ti is preferably 20 mass% or less for Fe, Ni, Mn, Mg, and Zn, and 10 mass% or less for Cu, Mo, and Zr.

第二接続部7と導体2の接続は、例えば、図示しない超音波接続装置で超音波溶接することにより行う。なお、超音波接続装置としては、例えば、本体部と超音波発振器とで構成され、本体部が、基台上に設けられたホーン支持部と、導体および端子を配置させる受け台とを有しており、ホーン支持部から延びて先端部に接続時に導体と当接するホーンチップが形成された超音波ホーンが設けられているものなどを用いることができるが、これに限定されるものではない。図2に示すように、導体接続部7aと接続される導体2の先端部を超音波溶接で(条件としては、例えば、周波数40kHz,加圧力0.1〜0.4MPa,超音波印加エネルギー1〜3000J)、断面が略円形状から断面が略矩形状に押し潰されて溶接部2bが形成され、溶接部2bの底面及び両側面は、導体接続部7aに形成された導電防食層10に溶接される。第二接続部7と導体2の接続方法は特にこれに限定するものではなく、圧着などその他幅広い接続手法に適用可能である。   The connection between the second connection portion 7 and the conductor 2 is performed by, for example, ultrasonic welding with an ultrasonic connection device (not shown). In addition, as an ultrasonic connection device, for example, it is composed of a main body part and an ultrasonic oscillator, and the main body part has a horn support part provided on a base and a cradle for arranging conductors and terminals. However, it is possible to use an ultrasonic horn provided with a horn chip formed from a horn support portion and having a horn chip formed in contact with a conductor at the time of connection. As shown in FIG. 2, the tip of the conductor 2 connected to the conductor connection portion 7a is ultrasonically welded (conditions are, for example, a frequency of 40 kHz, a pressure of 0.1 to 0.4 MPa, an ultrasonic application energy of 1 -3000J), the cross section is crushed from a substantially circular shape to a substantially rectangular cross section to form a welded portion 2b, and the bottom surface and both side surfaces of the welded portion 2b are formed on the conductive anticorrosion layer 10 formed on the conductor connecting portion 7a. Welded. The connection method of the 2nd connection part 7 and the conductor 2 is not specifically limited to this, It is applicable to other wide connection methods, such as crimping | compression-bonding.

次に本実施の形態の作用を説明する。   Next, the operation of this embodiment will be described.

本実施の形態においては、第二接続部7の電線1の導体2と接続する面にNi、Ni合金、Ti、Ti合金のいずれかからなる導電防食層10が形成されていることにより、異種の金属材料からなる端子と導体とを接続してもガルバニック腐食を防止することができるため、接続強度と接続抵抗との両方について良好な信頼性を得ることができる。   In the present embodiment, the conductive anticorrosion layer 10 made of any one of Ni, Ni alloy, Ti, and Ti alloy is formed on the surface of the second connection portion 7 that is connected to the conductor 2 of the electric wire 1. Since a galvanic corrosion can be prevented even if the terminal and conductor which consist of these metal materials are connected, favorable reliability can be acquired about both connection strength and connection resistance.

表1に、Al材と各種金属(Cu,Ni,Ti)を組み合わせ、その間に流れるガルバニック電流を測定した結果を示す。腐食環境として設定した測定溶液は5mass%NaClで、電流測定は500秒後に行った。また、上記した方法と同様の方法にてCu材にNi,Tiを組み合わせたときのガルバニック電流も測定した。   Table 1 shows the results of measuring the galvanic current flowing between Al materials and various metals (Cu, Ni, Ti). The measurement solution set as the corrosive environment was 5 mass% NaCl, and the current measurement was performed after 500 seconds. Moreover, the galvanic current when combining Ni and Ti with Cu material by the method similar to the above-mentioned method was also measured.

Figure 2011165618
Figure 2011165618

この表1から、NiとTiは、Alと接触して使用した場合、ガルバニック電流値がそれぞれ0.0328mAと0.0153mAであり、Cu/Alの0.0482mAと比べて電流値が小さいことがわかる。つまり、第二接続部7の導体2と接触する表面に上述の導電防食層10を形成することにより、ガルバニック腐食を低減できることがわかる。   From Table 1, when Ni and Ti are used in contact with Al, the galvanic current values are 0.0328 mA and 0.0153 mA, respectively, and the current values are smaller than 0.0482 mA of Cu / Al. Recognize. That is, it can be seen that galvanic corrosion can be reduced by forming the above-described conductive anticorrosion layer 10 on the surface of the second connection portion 7 that contacts the conductor 2.

導電防食層10の厚さは、100μm以下が望ましい。これは、NiとTiの電気抵抗は端子本体であるCuと比較して大きいため、接続部全体の電気抵抗上昇およびそれによる発熱を抑えるためには、その厚さが薄い方がよい為である。また逆に、防食の観点から、安定した防食を確保するため、NiとTiの層の厚さは10μm以上が望ましい。   The thickness of the conductive anticorrosion layer 10 is desirably 100 μm or less. This is because the electrical resistance of Ni and Ti is larger than that of Cu which is a terminal body, so that it is better to reduce the thickness in order to suppress the increase in electrical resistance of the entire connecting portion and the heat generated thereby. . Conversely, from the viewpoint of corrosion prevention, the thickness of the Ni and Ti layers is preferably 10 μm or more in order to ensure stable corrosion prevention.

導電防食層10を構成するNi或いはTiの形成は、端子成型前の板材の状態で連続的に可能なため、低コストで製造できる。   Since the formation of Ni or Ti constituting the conductive anticorrosion layer 10 can be continuously performed in the state of the plate material before terminal molding, it can be manufactured at low cost.

次に、本発明の第2の実施の形態を図3、図4により説明する。   Next, a second embodiment of the present invention will be described with reference to FIGS.

第1の実施の形態では、電線1の導体2と接触する第二接続部7の内側全面に導電防食層10を形成したが、ボルト締めにより相手先と接続を行う第一接続部6は、より安定した電気接続状態を維持するため、Ni系やTi系材料ではなく、母材であるCu系材料であるほうがより好ましい。そこで、本実施の形態は、導体2と接触する導体接続部7aの表面にのみ導電防食層10aを形成し、第一接続部6と絶縁層保持部7bではCu母材を露出させたものである。導電防食層10aは、インレイクラッド或いは部分めっきなどにより容易に形成することができる。また、絶縁層保持部7bがCu材そのものであるため、絶縁層3を保持するための加工が容易である。   In the first embodiment, the conductive anticorrosion layer 10 is formed on the entire inner surface of the second connection portion 7 that is in contact with the conductor 2 of the electric wire 1, but the first connection portion 6 that is connected to the counterpart by bolting is as follows. In order to maintain a more stable electrical connection state, it is more preferable to use a Cu-based material as a base material instead of a Ni-based or Ti-based material. Therefore, in the present embodiment, the conductive anticorrosion layer 10a is formed only on the surface of the conductor connection portion 7a in contact with the conductor 2, and the Cu base material is exposed at the first connection portion 6 and the insulating layer holding portion 7b. is there. The conductive anticorrosion layer 10a can be easily formed by inlay cladding or partial plating. Moreover, since the insulating layer holding part 7b is Cu material itself, the process for hold | maintaining the insulating layer 3 is easy.

さらに、本発明の第3の実施の形態を図5、図6により説明する。   Further, a third embodiment of the present invention will be described with reference to FIGS.

本発明の第3の実施の形態は、第2の実施の形態で説明した端子4の導体接続部7a及び絶縁層保持部7bの導体2や絶縁層3と接触しない外側面に、導電防食層10bを形成したものである。   In the third embodiment of the present invention, a conductive anticorrosion layer is formed on the outer surface of the terminal 4 that is not in contact with the conductor 2 and the insulating layer 3 of the terminal 4 and the insulating layer holding portion 7b described in the second embodiment. 10b is formed.

本実施の形態では、第1及び第2の実施の形態の効果に加え、導体接続部7a及び絶縁層保持部7bの外側面に導電防食層10bを形成することで、導体接続部7a及び絶縁層保持部7bの外部が腐食環境にさらされても防食できる。   In the present embodiment, in addition to the effects of the first and second embodiments, the conductive anticorrosion layer 10b is formed on the outer surfaces of the conductor connection portion 7a and the insulating layer holding portion 7b, thereby providing the conductor connection portion 7a and the insulation. Even if the outside of the layer holding portion 7b is exposed to a corrosive environment, corrosion protection can be achieved.

次に、本発明の実施例1〜7、比較例1〜3、及び、従来例1〜4について説明する。   Next, Examples 1 to 7 of the present invention, Comparative Examples 1 to 3 and Conventional Examples 1 to 4 will be described.

まず、実施例1〜7は、図1、図2にて説明した本発明の第1の実施の形態に係る端子付き電線であって、端子本体の材料と、導電防食層の形成方法及び材料を、種々変更した例を示したものである。   First, Examples 1 to 7 are electric wires with terminals according to the first embodiment of the present invention described with reference to FIGS. 1 and 2, and are materials for a terminal body, and methods and materials for forming a conductive anticorrosion layer. The example which changed variously is shown.

次に、比較例1〜3、従来例1〜4は、端子に導電防食層を形成しない例を示したものであり、端子形状は、図7、図8に示した通り、図1、図2に示した端子の形状と同様に形成した。   Next, Comparative Examples 1 to 3 and Conventional Examples 1 to 4 show examples in which a conductive anticorrosion layer is not formed on the terminals, and the terminal shapes are as shown in FIGS. It was formed in the same manner as the terminal shape shown in FIG.

なお、図7、図8には、図1、図2で説明した部材名称と同一符号を付し、説明は省略する。   7 and 8 are assigned the same reference numerals as the member names described in FIGS. 1 and 2, and the description thereof is omitted.

〔実施例1〕
Cu条(厚さ2.0mm)とNi条(厚さ0.25mm)を冷間圧延法により一体化させた複合材(クラッド材)を作製した。さらに、複合材を、総板厚0.8mmとなるように圧延加工を行った。その後、複合材をプレスして図1に示した端子形状に打ち抜き加工し、その後、電気機器に接続される第一接続部を形成するためのボルト穴加工を行った。
[Example 1]
A composite material (cladding material) in which Cu strip (thickness 2.0 mm) and Ni strip (thickness 0.25 mm) were integrated by a cold rolling method was produced. Further, the composite material was rolled so as to have a total thickness of 0.8 mm. Thereafter, the composite material was pressed and punched into the terminal shape shown in FIG. 1, and then a bolt hole was formed to form a first connection portion connected to the electrical device.

導体は、外径1.0mmの純Al素線を19本撚り合わせたもの(導体断面積;15mm2)を用いた。 The conductor used was a twist of 19 pure Al strands having an outer diameter of 1.0 mm (conductor cross-sectional area: 15 mm 2 ).

端子のNi面がAl導体と接するようにAl導体を端子の導体接続部上に設置したあと、超音波溶接にて端子と導体を接続し一体化させた。   After the Al conductor was placed on the conductor connection portion of the terminal so that the Ni surface of the terminal was in contact with the Al conductor, the terminal and the conductor were connected and integrated by ultrasonic welding.

〔実施例2〕
Cu条(厚さ2.0mm)とNi条(厚さ0.10mm)を冷間圧延法により一体化させた複合材(クラッド材)を作製した。さらに、複合材を、総板厚0.8mmとなるように圧延加工を行った。その後、複合材をプレスして図1に示した端子形状に打ち抜き加工し、その後、電気機器に接続される第一接続部を形成するためのボルト穴加工を行った。
[Example 2]
A composite material (cladding material) in which a Cu strip (thickness 2.0 mm) and a Ni strip (thickness 0.10 mm) were integrated by a cold rolling method was produced. Further, the composite material was rolled so as to have a total thickness of 0.8 mm. Thereafter, the composite material was pressed and punched into the terminal shape shown in FIG. 1, and then a bolt hole was formed to form a first connection portion connected to the electrical device.

導体は、外径1.0mmの純Al素線を19本撚り合わせたもの(導体断面積;15mm2)を用いた。 The conductor used was a twist of 19 pure Al strands having an outer diameter of 1.0 mm (conductor cross-sectional area: 15 mm 2 ).

端子のNi面がAl導体と接するようにAl導体を端子の導体接続部上に設置したあと、超音波溶接にて端子と導体を接続し一体化させた。   After the Al conductor was placed on the conductor connection portion of the terminal so that the Ni surface of the terminal was in contact with the Al conductor, the terminal and the conductor were connected and integrated by ultrasonic welding.

〔実施例3〕
Cu条(厚さ0.8mm)の片面をマスキングし、片面のみにNiめっき(厚さ10μm)を施した複合材を作製した。さらに、その後、複合材をプレスして図1に示した端子形状に打ち抜き加工し、その後、電気機器に接続される第一接続部を形成するためのボルト穴加工を行った。
Example 3
A composite material in which one side of a Cu strip (thickness 0.8 mm) was masked and Ni plating (thickness 10 μm) was applied only to one side was produced. Furthermore, after that, the composite material was pressed and punched into the terminal shape shown in FIG. 1, and then a bolt hole was formed to form a first connection portion connected to the electrical device.

導体は、外径1.0mmの純Al素線を19本撚り合わせたもの(導体断面積;15mm2)を用いた。 The conductor used was a twist of 19 pure Al strands having an outer diameter of 1.0 mm (conductor cross-sectional area: 15 mm 2 ).

端子のNi面がAl導体と接するようにAl導体を端子の導体接続部上に設置したあと、超音波溶接にて端子と導体を接続し一体化させた。   After the Al conductor was placed on the conductor connection portion of the terminal so that the Ni surface of the terminal was in contact with the Al conductor, the terminal and the conductor were connected and integrated by ultrasonic welding.

〔実施例4〕
Cu条(厚さ0.8mm)の片面をマスキングし、片面のみにNiめっき(厚さ8μm)を施した複合材を作製した。さらに、その後、複合材をプレスして図1に示した端子形状に打ち抜き加工し、その後、電気機器に接続される第一接続部を形成するためのボルト穴加工を行った。
Example 4
A composite material in which one side of a Cu strip (thickness 0.8 mm) was masked and Ni plating (thickness 8 μm) was applied only to one side was produced. Furthermore, after that, the composite material was pressed and punched into the terminal shape shown in FIG. 1, and then a bolt hole was formed to form a first connection portion connected to the electrical device.

導体は、外径1.0mmの純Al素線を19本撚り合わせたもの(導体断面積;15mm2)を用いた。 The conductor used was a twist of 19 pure Al strands having an outer diameter of 1.0 mm (conductor cross-sectional area: 15 mm 2 ).

端子のNi面がAl導体と接するようにAl導体を端子の導体接続部上に設置したあと、超音波溶接にて端子と導体を接続し一体化させた。   After the Al conductor was placed on the conductor connection portion of the terminal so that the Ni surface of the terminal was in contact with the Al conductor, the terminal and the conductor were connected and integrated by ultrasonic welding.

〔実施例5〕
Cu条(厚さ0.8mm)の片面をマスキングし、片面のみにNi−8mass%Pめっき(厚さ10μm)を施した複合材を作製した。さらに、その後、複合材をプレスして図1に示した端子形状に打ち抜き加工し、その後、電気機器に接続される第一接続部を形成するためのボルト穴加工を行った。
Example 5
A composite material in which one side of Cu strip (thickness 0.8 mm) was masked and Ni-8 mass% P plating (thickness 10 μm) was applied to only one side was produced. Furthermore, after that, the composite material was pressed and punched into the terminal shape shown in FIG. 1, and then a bolt hole was formed to form a first connection portion connected to the electrical device.

導体は、外径1.0mmの純Al素線を19本撚り合わせたもの(導体断面積;15mm2)を用いた。 The conductor used was a twist of 19 pure Al strands having an outer diameter of 1.0 mm (conductor cross-sectional area: 15 mm 2 ).

端子のNi面がAl導体と接するようにAl導体を端子の導体接続部上に設置したあと、超音波溶接にて端子と導体を接続し一体化させた。   After the Al conductor was placed on the conductor connection portion of the terminal so that the Ni surface of the terminal was in contact with the Al conductor, the terminal and the conductor were connected and integrated by ultrasonic welding.

〔実施例6〕
Cu条(厚さ2.0mm)とTi条(厚さ0.25mm)を冷間圧延法により一体化させた複合材(クラッド材)を作製した。さらに、複合材を、総板厚0.8mmとなるように圧延加工を行った。その後、複合材をプレスして図1に示した端子形状に打ち抜き加工し、その後、電気機器に接続される第一接続部を形成するためのボルト穴加工を行った。
Example 6
A composite material (cladding material) in which a Cu strip (thickness 2.0 mm) and a Ti strip (thickness 0.25 mm) were integrated by a cold rolling method was produced. Further, the composite material was rolled so as to have a total thickness of 0.8 mm. Thereafter, the composite material was pressed and punched into the terminal shape shown in FIG. 1, and then a bolt hole was formed to form a first connection portion connected to the electrical device.

導体は、外径1.0mmの純Al素線を19本撚り合わせたもの(導体断面積;15mm2)を用いた。 The conductor used was a twist of 19 pure Al strands having an outer diameter of 1.0 mm (conductor cross-sectional area: 15 mm 2 ).

端子のTi面がAl導体と接するようにAl導体を端子の導体接続部上に設置したあと、超音波溶接にて端子と導体を接続し一体化させた。   After the Al conductor was placed on the conductor connection portion of the terminal so that the Ti surface of the terminal was in contact with the Al conductor, the terminal and the conductor were connected and integrated by ultrasonic welding.

〔実施例7〕
Cu−Zn条(厚さ2.0mm)とNi条(厚さ0.25mm)を冷間圧延法により一体化させた複合材(クラッド材)を作製した。さらに、複合材を、総板厚0.8mmとなるように圧延加工を行った。その後、複合材をプレスして図1に示した端子形状に打ち抜き加工し、その後、電気機器に接続される第一接続部を形成するためのボルト穴加工を行った。
Example 7
A composite material (cladding material) in which Cu-Zn strips (thickness 2.0 mm) and Ni strips (thickness 0.25 mm) were integrated by a cold rolling method was produced. Further, the composite material was rolled so as to have a total thickness of 0.8 mm. Thereafter, the composite material was pressed and punched into the terminal shape shown in FIG. 1, and then a bolt hole was formed to form a first connection portion connected to the electrical device.

導体は、外径1.0mmの純Al素線を19本撚り合わせたもの(導体断面積;15mm2)を用いた。 The conductor used was a twist of 19 pure Al strands having an outer diameter of 1.0 mm (conductor cross-sectional area: 15 mm 2 ).

端子のNi面がAl導体と接するようにAl導体を端子の導体接続部上に設置したあと、超音波溶接にて端子と導体を接続し一体化させた。   After the Al conductor was placed on the conductor connection portion of the terminal so that the Ni surface of the terminal was in contact with the Al conductor, the terminal and the conductor were connected and integrated by ultrasonic welding.

〔比較例1〕
Cu条(厚さ0.8mm)をプレスして図7に示した端子形状に打ち抜き加工し、その後、電気機器に接続される第一接続部を形成するためのボルト穴加工を行った。
[Comparative Example 1]
A Cu strip (thickness 0.8 mm) was pressed and punched into the terminal shape shown in FIG. 7, and then a bolt hole was formed to form a first connection portion connected to an electrical device.

導体は、外径1.0mmの純Al素線を19本撚り合わせたもの(導体断面積;15mm2)を用いた。 The conductor used was a twist of 19 pure Al strands having an outer diameter of 1.0 mm (conductor cross-sectional area: 15 mm 2 ).

端子がAl導体と接するようにAl導体を端子の導体接続部上に設置したあと、超音波溶接にて端子と導体を接続し一体化させた。   After the Al conductor was placed on the conductor connection portion of the terminal so that the terminal was in contact with the Al conductor, the terminal and the conductor were connected and integrated by ultrasonic welding.

〔比較例2〕
Ni条(厚さ0.8mm)をプレスして図7に示した端子形状に打ち抜き加工し、その後、電気機器に接続される第一接続部を形成するためのボルト穴加工を行った。
[Comparative Example 2]
A Ni strip (thickness 0.8 mm) was pressed and punched into the terminal shape shown in FIG. 7, and then a bolt hole was formed to form a first connection portion connected to an electrical device.

導体は、外径1.0mmの純Al素線を19本撚り合わせたもの(導体断面積;15mm2)を用いた。 The conductor used was a twist of 19 pure Al strands having an outer diameter of 1.0 mm (conductor cross-sectional area: 15 mm 2 ).

端子がAl導体と接するようにAl導体を端子の導体接続部上に設置したあと、超音波溶接にて端子と導体を接続し一体化させた。   After the Al conductor was placed on the conductor connection portion of the terminal so that the terminal was in contact with the Al conductor, the terminal and the conductor were connected and integrated by ultrasonic welding.

〔比較例3〕
Ti条(厚さ0.8mm)をプレスして図7に示した端子形状に打ち抜き加工し、その後、電気機器に接続される第一接続部を形成するためのボルト穴加工を行った。
[Comparative Example 3]
A Ti strip (thickness 0.8 mm) was pressed and punched into the terminal shape shown in FIG. 7, and then a bolt hole was formed to form a first connection portion connected to an electrical device.

導体は、外径1.0mmの純Al素線を19本撚り合わせたもの(導体断面積;15mm2)を用いた。 The conductor used was a twist of 19 pure Al strands having an outer diameter of 1.0 mm (conductor cross-sectional area: 15 mm 2 ).

端子がAl導体と接するようにAl導体を端子の導体接続部上に設置したあと、超音波溶接にて端子と導体を接続し一体化させた。   After the Al conductor was placed on the conductor connection portion of the terminal so that the terminal was in contact with the Al conductor, the terminal and the conductor were connected and integrated by ultrasonic welding.

〔従来例1〕
Cu条(厚さ0.8mm)をプレスして図7に示した端子形状に打ち抜き加工し、その後、電気機器に接続される第一接続部を形成するためのボルト穴加工を行った。
[Conventional example 1]
A Cu strip (thickness 0.8 mm) was pressed and punched into the terminal shape shown in FIG. 7, and then a bolt hole was formed to form a first connection portion connected to an electrical device.

導体は、外径1.0mmの純Al素線を19本撚り合わせたもの(導体断面積;15mm2)を用いた。 The conductor used was a twist of 19 pure Al strands having an outer diameter of 1.0 mm (conductor cross-sectional area: 15 mm 2 ).

端子がAl導体と接するようにAl導体を端子の導体接続部上に設置したあと、超音波溶接にて端子と導体を接続し一体化させた。さらに、図8に示した第二接続部7の全体を樹脂製の熱収縮チューブで被覆した。   After the Al conductor was placed on the conductor connection portion of the terminal so that the terminal was in contact with the Al conductor, the terminal and the conductor were connected and integrated by ultrasonic welding. Further, the entire second connection portion 7 shown in FIG. 8 was covered with a heat shrinkable tube made of resin.

〔従来例2〕
Cu条(厚さ0.8mm)の表面でAl導体と接続する箇所、すなわち、図8にて溶接部2bが接触する面をマスキングし、それ以外の端子表面にSnめっき(厚さ10μm)を施した。その後、プレスして図7に示した端子形状に打ち抜き加工し、その後、電気機器に接続される第一接続部を形成するためのボルト穴加工を行った。
[Conventional example 2]
Mask the portion connected to the Al conductor on the surface of the Cu strip (thickness 0.8 mm), that is, the surface where the weld 2b contacts in FIG. 8, and apply Sn plating (thickness 10 μm) to the other terminal surfaces. gave. Then, it pressed and punched in the terminal shape shown in FIG. 7, and the bolt hole process for forming the 1st connection part connected to an electric equipment was performed after that.

導体は、外径1.0mmの純Al素線を19本撚り合わせたもの(導体断面積;15mm2)を用いた。 The conductor used was a twist of 19 pure Al strands having an outer diameter of 1.0 mm (conductor cross-sectional area: 15 mm 2 ).

端子のCu露出面がAl導体と接するようにAl導体を導体接続部に設置したあと、超音波溶接にて端子と導体を接続し一体化させた。   After placing the Al conductor on the conductor connecting portion so that the Cu exposed surface of the terminal was in contact with the Al conductor, the terminal and the conductor were connected and integrated by ultrasonic welding.

〔従来例3〕
Cu条(厚さ2.0mm)とAl条(厚さ0.25mm)を冷間圧延法により一体化させた複合材(クラッド材)を作製した。さらに、複合材を、総板厚0.8mmになるよう圧延加工を行った。その後、複合材をプレスして図7に示した端子形状に打ち抜き加工し、その後、電気機器に接続される第一接続部を形成するためのボルト穴加工を行った。
[Conventional example 3]
A composite material (cladding material) in which a Cu strip (thickness 2.0 mm) and an Al strip (thickness 0.25 mm) were integrated by a cold rolling method was produced. Further, the composite material was rolled so as to have a total thickness of 0.8 mm. Thereafter, the composite material was pressed and punched into the terminal shape shown in FIG. 7, and then a bolt hole was formed to form a first connection portion connected to the electrical device.

導体は、外径1.0mmの純Al素線を19本撚り合わせたもの(導体断面積;15mm2)を用いた。 The conductor used was a twist of 19 pure Al strands having an outer diameter of 1.0 mm (conductor cross-sectional area: 15 mm 2 ).

端子のAl面がAl導体と接するようにAl導体を端子の導体接続部上に設置したあと、超音波溶接にて端子と導体を接続し一体化させた。   After placing the Al conductor on the conductor connection portion of the terminal so that the Al surface of the terminal was in contact with the Al conductor, the terminal and the conductor were connected and integrated by ultrasonic welding.

〔従来例4〕
Cu条(厚さ0.8mm)をプレスして図7に示した端子形状に打ち抜き加工し、その後、電気機器に接続される第一接続部を形成するためのボルト穴加工を行った。図8に示した接続方法の代わりに、Al導体の端末部の露出された芯線をCuにSnめっきを施したキャップで被覆し、このキャップを包囲するように圧着し、端子とキャップ、導体を一体化させた。
[Conventional Example 4]
A Cu strip (thickness 0.8 mm) was pressed and punched into the terminal shape shown in FIG. 7, and then a bolt hole was formed to form a first connection portion connected to an electrical device. Instead of the connection method shown in FIG. 8, the exposed core wire of the end portion of the Al conductor is covered with a cap plated with Sn on Cu, and is crimped so as to surround the cap. Integrated.

上記した表1は、Al、Cu、Ni、Tiからなる金属の組合せを想定し、腐食環境下で異種金属間に流れるガルバニック電流を測定した結果を示したものである。腐食環境としては、5mass%NaClを用いて、測定は500秒後に行った。   Table 1 above shows the result of measuring the galvanic current flowing between different metals in a corrosive environment, assuming a combination of metals consisting of Al, Cu, Ni, and Ti. As a corrosive environment, 5 mass% NaCl was used, and the measurement was performed after 500 seconds.

表1の測定結果から、ガルバニック電流値の小さい組合せほど異種金属接触による腐食が小さいと推定することができる。   From the measurement results of Table 1, it can be estimated that the smaller the galvanic current value is, the smaller the corrosion due to contact with different metals.

表2は、表1による評価結果に基づき作製した本発明の実施例1〜7、比較例1〜3、および従来例1〜4の端子付き電線に係り、端子と導体の接続強度(初期の接続強度の値、塩水噴霧試験後の接続強度の値)、接続抵抗(初期の接続抵抗の値、塩水噴霧試験後の接続抵抗の値)、接続に関わる材料・工程を含めたコスト(「○」:合格の意味、「×」:不合格の意味)を比較し、総合評価(「○」:優秀の意味、「△」:合格の意味、「×」:不合格の意味)を行ったものである。   Table 2 relates to the electric wires with terminals of Examples 1 to 7, Comparative Examples 1 to 3, and Conventional Examples 1 to 4 of the present invention produced based on the evaluation results according to Table 1, and the connection strength between the terminals and the conductors (initial Connection strength value, connection strength value after salt spray test), connection resistance (initial connection resistance value, connection resistance value after salt spray test), cost including materials and processes related to connection (“○ ”: Meaning of pass,“ × ”: Meaning of failure, and overall evaluation (“ ○ ”: Meaning of excellence,“ △ ”: Meaning of pass,“ × ”: Meaning of failure) Is.

端子とAl導体の接続強度は、端子と導体の両端を掴み、引張り試験機にて電線が破断または接続部から電線が引き抜けるまでの引張り応力を測定した。測定は、初期と塩水噴霧試験後のそれぞれについて行い、接続強度の評価は、導体単体での強度の90%以上を○(優秀の意味)、85%以上90%未満を△(合格の意味)、85%未満を×(不合格の意味)とした。   The connection strength between the terminal and the Al conductor was measured by measuring the tensile stress until the electric wire was broken or the electric wire was pulled out from the connecting portion by grasping both ends of the terminal and the conductor. Measurement is conducted for each of the initial stage and after the salt spray test, and the evaluation of the connection strength is 90% or more of the strength of the conductor alone (excellent meaning), and 85% or more and less than 90% △ (meaning pass). , Less than 85% was taken as x (meaning failure).

また、端子とAl導体の接続抵抗測定は、直流4端子法を用い、接続部に10Aの通電条件で、初期と塩水噴霧試験後のそれぞれについて行い、抵抗値が30μΩ以下を○(優秀の意味)、30μΩを超えて60μΩ未満を△(合格の意味)、60μΩ以上を×(不合格の意味)とした。   In addition, the connection resistance measurement between the terminal and the Al conductor was performed for each of the initial and after the salt spray test using a direct current 4-terminal method with a current of 10 A applied to the connection part, and the resistance value was 30 μΩ or less. ), More than 30 μΩ and less than 60 μΩ were evaluated as Δ (meaning of acceptance), and 60 μΩ or more was evaluated as × (meaning of rejection).

なお、塩水噴霧試験の条件は、端子付き電線を恒温槽中に配置し、5mass%NaClの塩水を35℃の恒温槽中に120時間噴霧し、その後、80℃、湿度90〜95RHの恒温槽中で120時間放置することで行った。この塩水噴霧試験後に、初期と同様の方法で、接続強度の値、および接続抵抗の値をそれぞれ測定した。   The condition of the salt spray test is that the electric wire with terminal is placed in a thermostatic bath, 5 mass% NaCl salt water is sprayed in a thermostatic bath at 35 ° C. for 120 hours, and then the thermostatic bath at 80 ° C. and humidity 90-95RH. It was performed by leaving it for 120 hours. After this salt spray test, the connection strength value and the connection resistance value were measured in the same manner as in the initial stage.

この結果を表2に示す。   The results are shown in Table 2.

Figure 2011165618
Figure 2011165618

表2によれば、Al導体と端子のNi面が接している実施例1〜4は、初期の接続強度だけでなく、塩水噴霧試験後にも高い接続強度を保っていた。さらに、接続抵抗に関しても、初期及び塩水噴霧後で優れた値を示した。これは、実施例1〜4では、ガルバニック電流値の小さい組合せで接続部が構成されており、より腐食に敏感なAl導体の接続部の腐食が抑制できているためである。また、ベース材をCu材料としているため、部品全体の抵抗を低く抑えることができている。   According to Table 2, Examples 1 to 4 in which the Al conductor and the Ni surface of the terminal are in contact maintained not only the initial connection strength but also a high connection strength after the salt spray test. Further, regarding the connection resistance, an excellent value was exhibited at the initial stage and after spraying with salt water. This is because in Examples 1 to 4, the connection portion is configured with a small combination of galvanic current values, and corrosion of the connection portion of the Al conductor that is more sensitive to corrosion can be suppressed. Further, since the base material is a Cu material, the resistance of the entire component can be kept low.

Ni層の厚さは、数nm以上あれば有効であるが、より安定した接続信頼性を確保するためには、実施例3に示すように10μm以上が望ましい。また、Ni層は、Niリッチの合金、例えば実施例5に示すような、Ni−Pめっきでも同様の効果を得ることができる。また、表1の結果からもわかるとおり、Niの代わりに、実施例6に示すようなTi系材料を用いても同様に優れた接続強度及び接続抵抗が得られることがわかった。端子本体に関しては、実施例7に示すとおり、Cuに限らず、Cu合金でも他の実施例と同様の効果が得られる。   The thickness of the Ni layer is effective if it is several nm or more. However, in order to ensure more stable connection reliability, it is desirable that the thickness of the Ni layer be 10 μm or more as shown in Example 3. In addition, the Ni layer can obtain the same effect by Ni-rich alloy, for example, Ni-P plating as shown in Example 5. Also, as can be seen from the results in Table 1, it was found that excellent connection strength and connection resistance could be obtained even when a Ti-based material as shown in Example 6 was used instead of Ni. Regarding the terminal body, as shown in the seventh embodiment, not only Cu but also Cu alloy can provide the same effects as the other embodiments.

比較例1は、端子本体であるCuとAl導体を直接接続した結果であるが、この場合、表1からも予測できる通り、CuとAl間のガルバニック作用によりAl導体の腐食が進行し、腐食環境下での接続強度の信頼性は得ることができなかった。一方、端子本体をNi或いはTi材料のみとした比較例2、3はともに、耐腐食性は良好であったが、Ni或いはTi自体の電気抵抗がCuと比較して大きいため、接続部品全体の抵抗値が高いものとなる不具合が生じた。   Comparative Example 1 is the result of directly connecting the terminal body Cu and the Al conductor. In this case, as predicted from Table 1, the corrosion of the Al conductor proceeds due to the galvanic action between Cu and Al. Reliability of connection strength under the environment could not be obtained. On the other hand, both Comparative Examples 2 and 3 in which the terminal body was made of only Ni or Ti material had good corrosion resistance, but the electrical resistance of Ni or Ti itself was larger than that of Cu. There was a problem that the resistance value was high.

従来例1は、端子本体であるCuとAl導体を直接接続し、その上に防食用の熱収縮チューブを被覆したものであるが、この場合、接続信頼性は確保できるものの、熱収縮チューブという部品点数が増え、更にその被覆作業工程が必要となってくるため、高コストとなる。また、従来例2に示す接続部以外にSnめっきを施す方法は、Cu端子とAl導体の面積比効果を利用して腐食の低減を狙ったものであるが、ミクロな視点ではCuとAlの接続部は存在しているため、塩水噴霧後の接続強度が低下していることがわかる。したがって、高い接続強度の信頼性を必要とする部材としては不適切と判断できる。従来例3に示すCu/Alクラッド材からなる端子は、端子とAl導体の腐食は抑制可能であるが、端子自体がガルバニック腐食の発生しやすいCuとAlの複合材で形成されているため、端子内でのAlの腐食が発生し、結果として接続抵抗の上昇が発生することがわかる。従来例4で示す、端子とAl導体接続の間に中間キャップを設置する方法は、接続強度、接続抵抗ともによい特性は得られるが、中間キャップの部品点数増加とその作業工程の増加により、従来例1と同様、大幅なコストアップとなる。   Conventional Example 1 is a terminal body in which Cu and Al conductors are directly connected and coated with a heat-shrinkable tube for corrosion protection. In this case, although connection reliability can be ensured, it is called a heat-shrinkable tube. Since the number of parts increases and the covering work process becomes necessary, the cost increases. Further, the Sn plating method other than the connection portion shown in the conventional example 2 aims to reduce the corrosion by utilizing the area ratio effect of the Cu terminal and the Al conductor. Since the connection part exists, it turns out that the connection intensity | strength after salt spray is falling. Therefore, it can be determined that it is inappropriate as a member that requires high connection strength reliability. The terminal made of the Cu / Al clad material shown in Conventional Example 3 can suppress corrosion of the terminal and the Al conductor, but the terminal itself is formed of a composite material of Cu and Al that is likely to generate galvanic corrosion. It can be seen that Al corrosion occurs in the terminals, resulting in an increase in connection resistance. Although the method of installing the intermediate cap between the terminal and the Al conductor connection shown in Conventional Example 4 provides good characteristics in both connection strength and connection resistance, the conventional method has increased the number of parts of the intermediate cap and the number of work processes. As in Example 1, the cost is significantly increased.

以上の結果より、表2中の総合評価で示すとおり、実施例1〜7は、接続強度、接続抵抗、コストのすべてに優れた端子付き電線を提供することができる。   From the above results, as shown in the comprehensive evaluation in Table 2, Examples 1 to 7 can provide a terminal-attached electric wire excellent in connection strength, connection resistance, and cost.

1 電線
2 導体
3 絶縁層
4 端子
10 導電防食層
DESCRIPTION OF SYMBOLS 1 Electric wire 2 Conductor 3 Insulating layer 4 Terminal 10 Conductive anticorrosion layer

Claims (6)

端子と、該端子と異なる金属材料からなる導体上に絶縁層が形成されている電線とを備え、前記端子と前記導体が接続されている端子付き電線において、
前記端子は、前記導体が接続される面に、TiあるいはTi合金からなる導電防食層が形成されていることを特徴とする端子付き電線。
In the electric wire with a terminal comprising a terminal and an electric wire in which an insulating layer is formed on a conductor made of a metal material different from the terminal, the terminal and the conductor are connected,
The electric wire with a terminal, wherein the terminal has a conductive anticorrosion layer made of Ti or Ti alloy formed on a surface to which the conductor is connected.
端子と、該端子と異なる金属材料からなる導体上に絶縁層が形成されている電線とを備え、前記端子と前記導体が接続されている端子付き電線において、
前記端子は、前記導体が接続される面に、NiあるいはNi合金からなる導電防食層が形成されていることを特徴とする端子付き電線。
In the electric wire with a terminal comprising a terminal and an electric wire in which an insulating layer is formed on a conductor made of a metal material different from the terminal, the terminal and the conductor are connected,
The electric wire with a terminal, wherein the terminal has a conductive anticorrosion layer made of Ni or Ni alloy formed on a surface to which the conductor is connected.
前記Ti合金は、Tiに、Fe、Cu、Ni、Mn、Mg、Mo、Zn、Zrのうちから選ばれる1種以上を含む合金からなる請求項1に記載の端子付き電線。   The electric wire with a terminal according to claim 1, wherein the Ti alloy is made of an alloy containing at least one selected from Fe, Cu, Ni, Mn, Mg, Mo, Zn, and Zr. 前記Ni合金は、Niに、Si、Fe、Cu、Mn、Mg、Mo、Zn、Ti、P、Bのうちから選ばれる1種以上を含む合金からなる請求項2に記載の端子付き電線。   The electric wire with a terminal according to claim 2, wherein the Ni alloy is made of an alloy containing at least one selected from Si, Fe, Cu, Mn, Mg, Mo, Zn, Ti, P, and B in Ni. 前記端子は、CuあるいはCuに、Si、Fe、Ni、Mn、Mg、Mo、Zn、Ti、Pのうちから選ばれる1種以上を含むCu合金からなる請求項1乃至4のいずれかに記載の端子付き電線。   The said terminal consists of Cu alloy which contains Cu or Cu and Cu alloy containing 1 or more types chosen from Si, Fe, Ni, Mn, Mg, Mo, Zn, Ti, and P. 5. Electric wire with terminal. 前記導体は、AlあるいはAlに、Si、Fe、Ni、Mn、Mg、Zn、Tiのうちから選ばれる1種以上を含むAl合金からなる請求項1乃至4のいずれかに記載の端子付き電線。   5. The electric wire with terminal according to claim 1, wherein the conductor is made of Al or Al alloy containing at least one selected from Si, Fe, Ni, Mn, Mg, Zn, and Ti. .
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