JP2010108798A - Jointing part and jointing method of electric wire consisting of dissimilar metal - Google Patents

Jointing part and jointing method of electric wire consisting of dissimilar metal Download PDF

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JP2010108798A
JP2010108798A JP2008280761A JP2008280761A JP2010108798A JP 2010108798 A JP2010108798 A JP 2010108798A JP 2008280761 A JP2008280761 A JP 2008280761A JP 2008280761 A JP2008280761 A JP 2008280761A JP 2010108798 A JP2010108798 A JP 2010108798A
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conductor
terminal
electric wire
resin
caulking portion
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JP5255404B2 (en
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Hiroshi Orito
博 折戸
Satoshi Takamura
聡 高村
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Furukawa Electric Co Ltd
Furukawa Automotive Systems Inc
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Furukawa Electric Co Ltd
Furukawa Automotive Systems Inc
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/70—Insulation of connections

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Abstract

<P>PROBLEM TO BE SOLVED: To provide a jointing part of an electric wire and a terminal consisting of dissimilar metals which is easy to manufacture, uses little amount of resin, and is of cost. <P>SOLUTION: In a jointing part of an electric wire and a terminal in which the terminal 4 and a conductor 2 of the electric wire 1 are made of dissimilar metals, and a conductor caulking part 6 of the terminal 4 is crimped to the conductor 2 at the wire end part and an insulating coated caulking part 7 of the terminal 4 is crimped to an insulating coat 3 at the wire end part, resin 9 is respectively coated on a conductor exposed portion 2a between the insulating coated caulking part 3 and the conductor caulking part 6, a conductor exposed potion 2b at the tip side of the conductor caulking part 6, and a joining line portion 8 of the conductor caulking part 6, and these conductor exposed portions and the joining line portion of the conductor caulking part are covered with the resin 9. The terminal 4 has side walls 10, 11 rising from the both sides between the insulating coated caulking part 7 and the conductor caulking part 6 and at the tip side of the conductor caulking part 6. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、電線の導体と、それに圧着される端子とが異種金属である場合の、導体と端子の接触電位差による腐食を防止した電線と端子の接続部及び接続方法に関するものである。   The present invention relates to a connection portion and a connection method between an electric wire and a terminal, in which corrosion due to a contact potential difference between the conductor and the terminal is prevented when the conductor of the electric wire and the terminal to be crimped thereto are different metals.

通常、銅導体の電線を接続するコネクタとしては銅又は銅合金（以下、銅系材料という）からなる端子が使用されている。銅系材料からなる端子は、先端側に相手方端子と接触する接触部が設けられ、後端側に電線を接続する導体かしめ部及び絶縁被覆かしめ部が設けられている。かかる端子に銅導体の電線を接続するには、電線端部の絶縁被覆を除去して銅導体を露出させ、導体露出部分に導体かしめ部を圧着すると同時に、絶縁被覆端部に絶縁被覆かしめ部を圧着する。   Usually, a terminal made of copper or a copper alloy (hereinafter referred to as a copper-based material) is used as a connector for connecting a copper conductor. A terminal made of a copper-based material is provided with a contact portion that comes into contact with a mating terminal on the front end side, and a conductor caulking portion and an insulating coating caulking portion that connect an electric wire on the rear end side. To connect a copper conductor wire to such a terminal, remove the insulation coating at the end of the wire to expose the copper conductor, and crimp the conductor crimp to the exposed conductor, and at the same time, the insulation coating crimp to the insulation coating end. Crimp the.

自動車、ＯＡ機器、家電製品等の分野においては、導電性にすぐれた銅系材料からなる導体を有する銅電線が信号線、電力線として使用されてきた。中でも自動車分野においては、車両の高性能、高機能化が急速に進められてきていることから、車載される各種電気機器、制御機器等の増加に伴って、使用される銅電線も増加する傾向にあるのが現状である。このような状況下で車両の軽量化により燃費効率を向上させようとする場合、銅電線と比較してより軽量で安価なアルミ電線（導体がアルミ系材料からなる）が自動車分野において特に注目されている。   In the fields of automobiles, office automation equipment, home appliances, etc., copper wires having conductors made of copper-based materials having excellent conductivity have been used as signal lines and power lines. In particular, in the automotive field, high performance and high functionality of vehicles have been rapidly promoted, so that the number of copper electric wires used tends to increase with the increase in various on-vehicle electrical devices and control devices. Is the current situation. Under these circumstances, when trying to improve fuel efficiency by reducing the weight of a vehicle, aluminum wires that are lighter and cheaper than copper wires (the conductor is made of an aluminum-based material) are attracting particular attention in the automotive field. ing.

しかし、実際にアルミ電線を自動車用として用いる場合、異種金属接触腐食（電食）が問題となる。アルミ電線に限らず電線を配線する場合には、電線同士の接続や電線と電気機器の端子との接続のために電線に接続用端子を取り付ける必要がある。これらの端子や電線の導体は前述のとおり電気的特性にすぐれた銅系材料で形成されているものが多い。このため、アルミ電線を使用すると、どこかでアルミ系材料と銅系材料を接触・接合しなければならない場合が生じる。   However, when an aluminum electric wire is actually used for automobiles, contact with different metals (corrosion) becomes a problem. When wiring an electric wire as well as an aluminum electric wire, it is necessary to attach a connection terminal to the electric wire in order to connect the electric wires or connect the electric wires to the terminals of the electrical equipment. As described above, these terminals and conductors of electric wires are often made of a copper-based material having excellent electrical characteristics. For this reason, when an aluminum electric wire is used, a case where an aluminum-based material and a copper-based material must be contacted / joined somewhere occurs.

しかし、アルミと銅のように標準電極電位が相違する異種金属を接触・接合させた場合、接触・接合部において電食が発生する。特に、アルミ系材料からなる導体に接続される端子が銅系材料からなる場合には、導体と端子間の標準電極電位差が大きいため、雨天時の走行や洗車、あるいは結露などによって接触・接合部が被水した場合には、電気的に卑であるアルミ導体部のイオン化が進行して腐食が促進される。その結果、アルミ導体と端子との接触状態が悪化して電気的特性が不安定になるだけでなく、接触抵抗の増大や腐食による導体断面積の減少による電気抵抗の増大、更には断線が生じて電装部品の誤動作、機能停止に至ることも考えられる。   However, when different metals having different standard electrode potentials such as aluminum and copper are brought into contact / joining, electrolytic corrosion occurs at the contact / joining portion. In particular, when the terminal connected to the conductor made of aluminum material is made of copper material, the standard electrode potential difference between the conductor and the terminal is large. When water is exposed to water, ionization of the electrically conductive aluminum conductor proceeds to promote corrosion. As a result, the contact state between the aluminum conductor and the terminal deteriorates and the electrical characteristics become unstable, as well as an increase in contact resistance and an increase in electrical resistance due to a decrease in the conductor cross-sectional area due to corrosion, as well as disconnection. This can lead to malfunctions and malfunctions of electrical components.

このような電食を防ぐ手段としては従来から、端子と導体の接続部のまわりに樹脂などの防水材をモールドして接続部を防水材の中に埋め込む方法（特許文献１参照）や、端子を収納するハウジングを防水構造にした防水コネクタを用いる方法（特許文献２参照）などがある。   Conventionally, as means for preventing such electric corrosion, a method of molding a waterproof material such as resin around the connection portion between the terminal and the conductor and embedding the connection portion in the waterproof material (see Patent Document 1), or a terminal For example, there is a method using a waterproof connector in which a housing for housing a waterproof structure is used (see Patent Document 2).

実公平７−２９５７７号公報No. 7-29577 特許第２６５００５１号公報Japanese Patent No. 2650051

しかし、モールドを施す方法は、その構造や製造工程が複雑になり、製造設備も大掛かりになる上、使用樹脂量も多いためコストがかかる。また防水コネクタを用いる方法は、従来防水コネクタが不要とされていた部位に防水コネクタを使用することになり大幅なコストアップを招くだけでなく、振動疲労や経年劣化で亀裂などが生じた場合、その亀裂部から雨水等がコネクタ内に浸入して、逆に電食を促進する結果となる。   However, the method of applying a mold complicates the structure and manufacturing process, requires a large amount of manufacturing equipment, and requires a large amount of resin to be used. In addition, the method using a waterproof connector will not only cause a significant cost increase due to the use of the waterproof connector in the area where the conventional waterproof connector is unnecessary, but if cracks occur due to vibration fatigue or aging, Rainwater or the like enters the connector from the crack, and conversely promotes electrolytic corrosion.

本発明の目的は、製造が簡単で、使用樹脂量が少なく、コストも安くて済む、異種金属からなる電線と端子の接続部及び接続方法を提供することにある。   An object of the present invention is to provide a connecting portion and a connecting method of a wire and a terminal made of different metals, which are simple to manufacture, use a small amount of resin, and can be manufactured at a low cost.

上記目的を達成するため本発明は、端子と電線の導体とが異種金属からなり、前記端子の導体かしめ部を電線端部の導体に圧着し、前記端子の絶縁被覆かしめ部を電線端部の絶縁被覆に圧着してなる電線と端子の接続部において、前記絶縁被覆かしめ部と導体かしめ部の間の導体露出部分及び導体かしめ部の先端側の導体露出部分にそれぞれ樹脂を塗布して、それらの導体露出部分を樹脂で覆ったことを特徴とするものである。   In order to achieve the above object, according to the present invention, the terminal and the conductor of the electric wire are made of different metals, the conductor caulking portion of the terminal is crimped to the conductor of the electric wire end portion, and the insulation covering caulking portion of the terminal is connected to the electric wire end portion. In the connecting portion between the electric wire and the terminal crimped to the insulating coating, resin is applied to the exposed conductor portion between the insulating coating caulking portion and the conductive caulking portion and the exposed conductor portion on the tip side of the conductive caulking portion, respectively. The conductor exposed portion of is covered with resin.

本発明に係る接続部は、導体かしめ部の合わせ目部分にも樹脂を塗布して、当該合わせ目部分を樹脂で覆ったものであることが好ましい。   It is preferable that the connection part which concerns on this invention apply | coats resin also to the joint part of a conductor crimping part, and has covered the said joint part with resin.

また本発明に係る接続部は、端子が、絶縁被覆かしめ部と導体かしめ部の間及び導体かしめ部の先端側に、両側から立ち上がる側壁を有するものからなり、これらの側壁の間に導体露出部分を覆うように樹脂が塗布されているものであることが好ましい。   Further, the connection portion according to the present invention is such that the terminal has side walls rising from both sides between the insulation coating caulking portion and the conductor caulking portion and at the tip end side of the conductor caulking portion, and the conductor exposed portion is interposed between these side walls. It is preferable that resin is applied so as to cover.

また本発明に係る接続部は、端子の前記側壁の高さが、電線の絶縁被覆の外径と同じかそれより大きいものであることが好ましい。   Moreover, it is preferable that the connection part which concerns on this invention is the thing whose height of the said side wall of a terminal is the same as or larger than the outer diameter of the insulation coating of an electric wire.

また本発明に係る接続部は、導体露出部分に塗布した樹脂の厚さが、電線の絶縁被覆の厚さと同じかそれより厚いものであることが好ましい。   Moreover, it is preferable that the thickness of the resin apply | coated to the conductor exposed part is the same as that of the insulation coating of an electric wire, or thicker than that.

また本発明に係る接続部は、樹脂と端子の接着強度が３ＭＰａ以上であり、樹脂の弾性率が４００ＭＰａ以上、吸水率が５％以下であることが好ましい。   In the connecting portion according to the present invention, it is preferable that the adhesive strength between the resin and the terminal is 3 MPa or more, the elastic modulus of the resin is 400 MPa or more, and the water absorption is 5% or less.

また本発明に係る接続部は、導体の先端面が導体かしめ部の先端面と実質的に同じ位置にあるものであることが好ましい   Moreover, it is preferable that the connection part which concerns on this invention is a thing in which the front end surface of a conductor exists in the substantially same position as the front end surface of a conductor crimping part.

また本発明に係る接続部は、電線の導体がアルミニウム又はアルミニウム合金からなり、端子が銅又は銅合金からなるものであることが好ましい。   Moreover, it is preferable that the connection part which concerns on this invention is that a conductor of an electric wire consists of aluminum or an aluminum alloy, and a terminal consists of copper or a copper alloy.

また本発明に係る異種金属からなる電線と端子の接続方法は、端子と電線の導体とが異種金属からなり、前記端子の導体かしめ部を電線端部の導体に、前記端子の絶縁被覆かしめ部を電線端部の絶縁被覆に圧着して電線と端子を接続する方法において、
前記端子として、絶縁被覆かしめ部と導体かしめ部の間及び導体かしめ部の先端側に両側から立ち上がる側壁を有する端子を用い、
前記側壁の間の導体露出部分及び前記導体かしめ部の合わせ目部分にそれぞれ樹脂を塗布して、導体露出部分及び導体かしめ部の合わせ目部分を樹脂で覆うことを特徴とするものである。 Further, according to the present invention, there is provided a method for connecting an electric wire and a terminal made of different metals, wherein the terminal and the conductor of the electric wire are made of different metals, and the conductor caulking portion of the terminal is used as the conductor at the end of the electric wire, and the insulating coating caulking portion of the terminal. In the method of connecting the wire and the terminal by crimping to the insulation coating at the end of the wire,
As the terminal, using a terminal having a side wall rising from both sides between the insulation coating caulking portion and the conductor caulking portion and on the tip side of the conductor caulking portion,
Resin is apply | coated to the conductor exposed part between the said side walls, and the joint part of the said conductor crimping part, respectively, and the joint part of a conductor exposed part and a conductor crimping part is covered with resin, It is characterized by the above-mentioned.

本発明によれば、端子の絶縁被覆かしめ部と導体かしめ部の間の導体露出部分及び導体かしめ部の先端側の導体露出部分をそれぞれ樹脂で覆ったことにより、端子と導体の接触部が被水するおそれがなくなるので、端子と導体の接触電位差による腐食を防止することができる。また、導体露出部分に樹脂を塗布するだけであるので、製造作業は容易であり、製造設備も簡単なものでよく、使用樹脂量も少なくて済み、低コストの防食型接続部を得ることができる。   According to the present invention, the conductor exposed portion between the insulation coating caulking portion and the conductor caulking portion of the terminal and the conductor exposed portion on the distal end side of the conductor caulking portion are respectively covered with the resin, so that the contact portion between the terminal and the conductor is covered. Since there is no risk of water, corrosion due to the contact potential difference between the terminal and the conductor can be prevented. In addition, since only the resin is applied to the exposed conductor portion, the manufacturing work is easy, the manufacturing equipment is simple, the amount of resin used is small, and a low-cost anticorrosive connection can be obtained. it can.

また、導体かしめ部の両側かしめ片の合わせ目部分にも樹脂を塗布すれば、当該合わせ目部分から水が浸入するのを確実に防止できるので、導体かしめ部内での端子と導体の接触電位差による腐食を防止することができる。   In addition, if resin is also applied to the joint portions of the caulking pieces on both sides of the conductor caulking portion, water can be surely prevented from entering from the joint portions, so that the contact potential difference between the terminal and the conductor in the conductor caulking portion can be prevented. Corrosion can be prevented.

また、絶縁被覆かしめ部と導体かしめ部の間及び導体かしめ部の先端側に、両側から立ち上がる側壁を有する端子を用いると、導体露出部分に塗布する樹脂が塗布範囲以外に流れ出すのを側壁によって規制できるため、樹脂の塗布作業を容易に行うことができると共に、樹脂塗膜の厚さを確保することができる。粘度5000〜20000ｍＰa・ｓ程度の比較的低粘度の樹脂を使用する場合は、樹脂の浸透性が高いため、側壁の高さは樹脂の浸透性も考慮した高さとなっている。   In addition, if terminals with side walls rising from both sides are used between the insulation coating caulking part and the conductor caulking part and on the tip side of the conductor caulking part, the side wall restricts the resin applied to the conductor exposed part from flowing out of the application range. Therefore, the resin coating operation can be easily performed and the thickness of the resin coating film can be secured. When a relatively low viscosity resin having a viscosity of about 5000 to 20000 mPa · s is used, since the resin has high permeability, the height of the side wall is set in consideration of the resin permeability.

また、端子の前記側壁の高さを、電線の絶縁被覆の外径と同じかそれより大きくすると、樹脂をより厚く塗布できるため、環境劣化（割れ、ひび）が発生しにくい、防水性の高い樹脂塗膜を容易に形成することができる。   Also, if the height of the side wall of the terminal is equal to or larger than the outer diameter of the insulation coating of the electric wire, the resin can be applied thicker, so that environmental degradation (cracking and cracking) is less likely to occur, and it is highly waterproof. A resin coating film can be easily formed.

また、導体露出部分に塗布した樹脂の厚さを、電線の絶縁被覆の厚さと同等かそれより厚くすると、樹脂塗膜の環境劣化（割れ、ひび）が発生しにくい、防水性の高い接続部を得ることができる。   Also, if the thickness of the resin applied to the exposed part of the conductor is equal to or greater than the thickness of the insulation coating of the wire, the resin coating is less susceptible to environmental degradation (cracking and cracking) and has a highly waterproof connection. Can be obtained.

また、導体の先端面が導体かしめ部の先端面と実質的に同じ位置あるようにすれば、導体の先端部が導体かしめ部の圧着によりバラけることがないので、導体かしめ部の先端側の導体露出部分（この場合は導体の端面が露出部分となる）をより簡単に確実に樹脂で埋め込むことができ、より安定性の高い防食効果を得ることができる。   In addition, if the tip end surface of the conductor is positioned substantially the same as the tip end surface of the conductor caulking portion, the tip end portion of the conductor will not be displaced due to the crimping of the conductor caulking portion. The exposed conductor portion (in this case, the end surface of the conductor becomes the exposed portion) can be more easily and reliably embedded with resin, and a more stable anticorrosive effect can be obtained.

図１は本発明の一実施形態を示す。図において、１はアルミ系材料からなる導体２に絶縁被覆３を被せてなる電線、４は銅系材料からなる端子である。端子４は、先端側に相手方端子との接触部５を有し、後端側に導体かしめ部６及び絶縁被覆かしめ部７を有している。導体かしめ部２は電線１の端部に露出させた導体２に圧着され、絶縁被覆かしめ部７は絶縁被覆３の端部に圧着されている。   FIG. 1 shows an embodiment of the present invention. In the figure, reference numeral 1 denotes an electric wire formed by covering a conductor 2 made of an aluminum-based material with an insulating coating 3, and 4 denotes a terminal made of a copper-based material. The terminal 4 has a contact portion 5 with a counterpart terminal on the front end side, and has a conductor caulking portion 6 and an insulating coating caulking portion 7 on the rear end side. The conductor caulking portion 2 is crimped to the conductor 2 exposed at the end portion of the electric wire 1, and the insulating coating caulking portion 7 is crimped to the end portion of the insulating coating 3.

この実施形態は、上記のような異種金属からなる電線と端子の接続部において、絶縁被覆かしめ部７と導体かしめ部６の間の導体露出部分２ａ、導体かしめ部６の先端側の導体露出部分２ｂ及び導体かしめ部６の合わせ目部分８にそれぞれ樹脂９を塗布、硬化させて、それらの導体露出部分２ａ、２ｂ及び合わせ目部分８を樹脂９で覆ったことを特徴とするものである。樹脂９としては、シリコーン系、アクリル系、ウレタン系、ポリアミド系又はエポキシ系の樹脂などを使用できる。   In this embodiment, the conductor exposed portion 2a between the insulation coating caulking portion 7 and the conductor caulking portion 6 and the conductor exposed portion on the distal end side of the conductor caulking portion 6 in the connecting portion between the electric wire and the terminal made of different metals as described above. The resin 9 is applied to the joint portions 8 of the 2b and the conductor caulking portions 6 and cured, and the conductor exposed portions 2a and 2b and the joint portions 8 are covered with the resin 9. As the resin 9, a silicone-based, acrylic-based, urethane-based, polyamide-based, or epoxy-based resin can be used.

端子４は、絶縁被覆かしめ部７と導体かしめ部６の間及び導体かしめ部６の先端側に、両側から立ち上がる側壁１０、１０、１１、１１を有しており、樹脂９は、両側の側壁１０、１０の間、１１、１１の間に導体露出部分を覆うように塗布されている。各側壁１０、１０、１１、１１の端子底面から上端までの高さｈは、電線の絶縁被覆３の外径ｄと同じかそれより大きく設定されている。   The terminal 4 has side walls 10, 10, 11, 11 that rise from both sides between the insulating coating caulking portion 7 and the conductor caulking portion 6 and on the leading end side of the conductor caulking portion 6. It is applied so as to cover the exposed conductor portion between 10, 10 and 11, 11. The height h from the terminal bottom surface to the upper end of each side wall 10, 10, 11, 11 is set to be equal to or larger than the outer diameter d of the insulating coating 3 of the electric wire.

上記のような構成にすると、端子４と導体２の接触部が被水するおそれがなく、また導体かしめ部の合わせ目部分８から水が浸入するおそれもなくなるので、端子４と導体２の接触電位差による腐食を防止することができる。また、導体露出部分２ａ、２ｂ及び導体かしめ部の合わせ目部分８に樹脂９を塗布するだけであるので、製造作業は容易であり、製造設備も簡単なものでよく、使用樹脂量も少なくて済み、低コストの防食型接続部を得ることができる。また、導体露出部分に塗布する樹脂は、側壁１０、１０、１１、１１によって塗布範囲以外に流れ出すのを規制されるため、樹脂の塗布作業を容易に行うことができると共に、樹脂溜まりが出来やすくなり、樹脂塗膜の必要厚さを確保することができる。   With the configuration as described above, there is no possibility that the contact portion between the terminal 4 and the conductor 2 will get wet, and there is no possibility that water will enter from the joint portion 8 of the caulking portion of the conductor. Corrosion due to potential difference can be prevented. Moreover, since the resin 9 is simply applied to the conductor exposed portions 2a and 2b and the joint portion 8 of the conductor caulking portion, the manufacturing operation is easy, the manufacturing equipment is simple, and the amount of resin used is small. Thus, a low-cost anticorrosion type connecting portion can be obtained. Further, since the resin applied to the exposed conductor portion is restricted from flowing out of the application range by the side walls 10, 10, 11, and 11, the resin application operation can be easily performed and the resin pool can be easily formed. Therefore, the required thickness of the resin coating film can be ensured.

次に、上記のように構成された接続部の試作試験結果を説明する。自動車ワイヤーハーネス用のアルミ電線（0.75mm2以上）に銅端子を圧着した接続部に、図１のように樹脂を塗布、硬化させてサンプルを作製した。樹脂は塗布時の粘度が5000〜20000ｍＰa・ｓのものを使用した。この粘度は、接続部に塗布する際に、流動性がありすぎると流れ出てしまい所望の厚さに塗布できないことと、流動性がなさすぎる（硬すぎる）と細かい隙間に入り込まないことを勘案して選定されたもので、ごく一般的な値である。このようなサンプルであって、塗布硬化後の−４０℃〜１２５℃の範囲における樹脂と端子との接着強度、塗布硬化後の樹脂の吸水率、端子の側壁の高さｈ、樹脂塗膜の厚さｔが異なる各種サンプルを試作し（塗布硬化後の樹脂の弾性率はいずれも４００ＭＰａ以上）、各サンプルについて接続部の抵抗値を予め測定した後、次の環境試験（加速劣化試験）を行った。
（１）
高温放置：１２０±３℃、１２０時間放置
（２）塩水噴霧：３５±５℃、塩水濃度５＋１mass％、比重1.0268〜1.0413、ｐＨ6.5〜7.2の塩水を68.6〜176.5kPaの圧力で９６時間噴霧
（３）高温高湿：８０±５℃、湿度９０〜９５％ＲＨで９６時間放置 Next, the results of a trial test of the connection part configured as described above will be described. A sample was prepared by applying and curing a resin as shown in FIG. 1 to a connection part obtained by crimping a copper terminal to an aluminum electric wire (0.75 mm 2 or more) for an automobile wire harness. A resin having a viscosity of 5000 to 20000 mPa · s at the time of application was used. This viscosity takes into account that when it is applied to the connection part, it will flow out if it is too fluid and cannot be applied to the desired thickness, and if it is too fluid (too hard) it will not enter a fine gap. This is a very general value. In such a sample, the adhesive strength between the resin and the terminal in the range of −40 ° C. to 125 ° C. after coating and curing, the water absorption rate of the resin after coating and curing, the height h of the side wall of the terminal, the resin coating film Various samples with different thicknesses t were prototyped (the modulus of elasticity of the resin after coating and curing is 400 MPa or more), the resistance value of the connection portion was measured in advance for each sample, and then the next environmental test (accelerated deterioration test) was performed. went.
(1)
High temperature standing: 120 ± 3 ° C, 120 hours standing (2) Salt spray: 35 ± 5 ° C, salt water concentration 5 + 1 mass%, specific gravity 1.0268-1.0413, pH 6.5-7.2 salt water sprayed at 68.6-176.5kPa for 96 hours (3) High temperature and high humidity: left for 96 hours at 80 ± 5 ° C. and humidity 90-95% RH

環境試験後、各サンプルについて接続部の抵抗値を測定した結果を表１に示す。抵抗値は、環境試験前の抵抗値に比べ環境試験後の抵抗値の増加が2.5ｍΩ以下であったものを合格とした。   Table 1 shows the result of measuring the resistance value of the connection portion for each sample after the environmental test. The resistance value was determined to be acceptable if the increase in resistance value after the environmental test was 2.5 mΩ or less compared to the resistance value before the environmental test.

Figure 2010108798
Figure 2010108798

この結果によれば、電線と端子の接続部は、樹脂と端子の接着強度が３ＭＰａ以上、樹脂の吸水率が５％以下で、さらに端子の側壁の高さｈが電線の絶縁被覆の外径Ｄと同じかそれより大きく、かつ図３に示すように、導体露出部分２ａ、２ｂに塗布された樹脂９の厚さｔが電線の絶縁被覆の厚さと同等かそれより厚くなっていることが好ましいといえる。   According to this result, the connecting portion between the electric wire and the terminal has an adhesive strength between the resin and the terminal of 3 MPa or more, a water absorption of the resin of 5% or less, and the height h of the side wall of the terminal is the outer diameter of the insulating coating of the electric wire. As shown in FIG. 3, the thickness t of the resin 9 applied to the exposed conductor portions 2a and 2b is equal to or greater than the thickness of the insulation coating of the electric wire, as shown in FIG. It can be said that it is preferable.

以上の実施形態では、導体かしめ部の合わせ目部分にも樹脂を塗布したが、導体かしめ部の合わせ目部分が十分な水密性を有する場合には、この部分への樹脂の塗布を省略することも可能である。粘度5000〜20000ｍＰa・ｓの樹脂は、細かい隙間への浸透性があるので、合わせ目部分に塗布しなくても、導体露出部分に塗布するだけで、所定の防食性を得ることは可能である。   In the above embodiment, the resin is also applied to the joint portion of the conductor caulking portion. However, when the joint portion of the conductor caulking portion has sufficient water tightness, the application of the resin to this portion is omitted. Is also possible. Resin having a viscosity of 5000-20000 mPa · s has permeability to fine gaps, so that it is possible to obtain a predetermined anti-corrosion property simply by applying it to the exposed part of the conductor without applying it to the joint part. .

図２は本発明に係る電線と端子の接続部の他の実施形態を示す。この実施形態は、導体２の先端面が導体かしめ部６の先端面と同じ位置にあるようにしたものである。それ以外の構成は図１の実施形態と同じであるので、同一部分には同一符号を付して説明を省略する。   FIG. 2 shows another embodiment of the connecting portion between the electric wire and the terminal according to the present invention. In this embodiment, the tip surface of the conductor 2 is located at the same position as the tip surface of the conductor caulking portion 6. Since the other configuration is the same as that of the embodiment of FIG. 1, the same parts are denoted by the same reference numerals and the description thereof is omitted.

このような構成にすると、導体２の先端部が導体かしめ部６の圧着によりバラけることがないので、導体かしめ部６の先端側の導体露出部分（この場合は導体の端面が露出部分となる）をより簡単に確実に樹脂９で埋め込むことができ、より安定性の高い防食効果を得ることができる。   With such a configuration, the tip end portion of the conductor 2 does not vary due to the crimping of the conductor caulking portion 6, so that the conductor exposed portion on the tip end side of the conductor caulking portion 6 (in this case, the end face of the conductor becomes the exposed portion). ) Can be more easily and reliably embedded with the resin 9, and a more stable anticorrosion effect can be obtained.

本発明に係る電線と端子の接続部の一実施形態を示す（Ａ）は平面図、（Ｂ）は側面図、（Ｃ）、（Ｄ）、（Ｅ）はそれぞれ（Ｂ）のＣ−Ｃ線、Ｄ−Ｄ線、Ｅ−Ｅ線における拡大断面図。(A) which shows one Embodiment of the connection part of the electric wire and terminal which concerns on this invention is a top view, (B) is a side view, (C), (D), (E) is CC of (B), respectively. The expanded sectional view in a line, DD line, and EE line. 本発明に係る電線と端子の接続部の他の実施形態を示す平面図。The top view which shows other embodiment of the connection part of the electric wire which concerns on this invention, and a terminal.

符号の説明Explanation of symbols

１：電線
２：アルミ系材料からなる導体
２ａ、２ｂ：導体露出部分
３：絶縁被覆
４：銅系材料からなる端子
５：接触部
６：導体かしめ部
７：絶縁被覆かしめ部
８：導体かしめ部の合わせ目部分
９：樹脂
１０、１１：側壁 1: Electric wire 2: Conductor 2a made of aluminum material, 2b: Conductor exposed portion 3: Insulation coating 4: Terminal made of copper material 5: Contact portion 6: Conductor caulking portion 7: Insulation covering caulking portion 8: Conductor caulking portion Seam portion 9: Resin 10, 11: Side wall

Claims (9)

端子と電線の導体とが異種金属からなり、前記端子の導体かしめ部を電線端部の導体に圧着し、前記端子の絶縁被覆かしめ部を電線端部の絶縁被覆に圧着してなる電線と端子の接続部において、前記絶縁被覆かしめ部と導体かしめ部の間の導体露出部分及び導体かしめ部の先端側の導体露出部分にそれぞれ樹脂を塗布して、それらの導体露出部分を樹脂で覆ったことを特徴とする異種金属からなる電線と端子の接続部。   The terminal and the conductor of the electric wire are made of different metals, and the electric wire and the terminal are formed by crimping the conductor caulking portion of the terminal to the electric conductor at the end of the electric wire, and crimping the insulating covering caulking portion of the terminal to the insulating coating of the electric wire end portion. In the connecting portion, a resin was applied to the exposed conductor portion between the insulating coating caulking portion and the conductor caulking portion and the exposed conductor portion on the tip side of the caulking portion of the conductor, and the exposed conductor portion was covered with the resin. An electric wire and terminal connection made of a dissimilar metal. 導体かしめ部の合わせ目部分にも樹脂を塗布して、当該合わせ目部分を樹脂で覆ったことを特徴とする請求項１記載の異種金属からなる電線と端子の接続部。   2. A connecting portion between an electric wire and a terminal made of a dissimilar metal according to claim 1, wherein a resin is applied to a joint portion of the conductor caulking portion, and the joint portion is covered with the resin. 端子は、絶縁被覆かしめ部と導体かしめ部の間及び導体かしめ部の先端側に、両側から立ち上がる側壁を有しており、これらの側壁の間に導体露出部分を覆うように樹脂が塗布されていることを特徴とする請求項１又は２記載の異種金属からなる電線と端子の接続部。   The terminal has side walls rising from both sides between the insulation coating caulking portion and the conductor caulking portion and on the tip side of the conductor caulking portion, and resin is applied between these side walls so as to cover the exposed portion of the conductor. The electric wire and terminal connecting portion made of a dissimilar metal according to claim 1 or 2. 端子の前記側壁の高さが、電線の絶縁被覆の外径と同じかそれより大きいことを特徴とする請求項３記載の異種金属からなる電線と端子の接続部。   4. A connecting portion between an electric wire and a terminal made of a dissimilar metal according to claim 3, wherein the height of the side wall of the terminal is equal to or larger than the outer diameter of the insulating coating of the electric wire. 導体露出部分に塗布した樹脂の厚さが、電線の絶縁被覆の厚さと同じかそれより厚いことを特徴とする請求項１ないし４のいずれかに記載の異種金属からなる電線と端子の接続部。   5. A connecting portion between an electric wire and a terminal made of a dissimilar metal according to claim 1, wherein the thickness of the resin applied to the exposed conductor is equal to or greater than the thickness of the insulating coating of the electric wire. . 樹脂と端子の接着強度が３ＭＰａ以上であり、樹脂の弾性率が４００ＭＰａ以上、吸水率が５％以下であることを特徴とする請求項５記載の異種金属からなる電線と端子の接続部。   6. The wire-to-terminal connecting portion made of a dissimilar metal according to claim 5, wherein the adhesive strength between the resin and the terminal is 3 MPa or more, the elastic modulus of the resin is 400 MPa or more, and the water absorption is 5% or less. 導体の先端面が導体かしめ部の先端面と実質的に同じ位置にあることを特徴とする請求項１〜５のいずれかに記載の異種金属からなる電線と端子の接続部。   The connecting portion between the electric wire and the terminal made of a dissimilar metal according to any one of claims 1 to 5, wherein the leading end surface of the conductor is substantially at the same position as the leading end surface of the conductor caulking portion. 電線の導体がアルミニウム又はアルミニウム合金からなり、端子が銅又は銅合金からなることを特徴とする請求項１〜７のいずれかに記載の異種金属からなる電線と端子の接続部。   8. A connecting portion between a wire and a terminal made of a dissimilar metal according to claim 1, wherein the conductor of the wire is made of aluminum or an aluminum alloy, and the terminal is made of copper or a copper alloy. 端子と電線の導体とが異種金属からなり、前記端子の導体かしめ部を電線端部の導体に、前記端子の絶縁被覆かしめ部を電線端部の絶縁被覆に圧着して電線と端子を接続する方法において、
前記端子として、絶縁被覆かしめ部と導体かしめ部の間及び導体かしめ部の先端側に両側から立ち上がる側壁を有する端子を用い、
前記側壁の間の導体露出部分及び前記導体かしめ部の合わせ目部分にそれぞれ樹脂を塗布して、導体露出部分及び導体かしめ部の合わせ目部分を樹脂で覆うことを特徴とする異種金属からなる電線と端子の接続方法。 The terminal and the conductor of the electric wire are made of different metals, and the conductor caulking portion of the terminal is crimped to the conductor at the end of the electric wire, and the insulating coating caulking portion of the terminal is crimped to the insulating coating of the end of the electric wire to connect the electric wire and the terminal. In the method
As the terminal, using a terminal having a side wall rising from both sides between the insulation coating caulking portion and the conductor caulking portion and on the tip side of the conductor caulking portion,
An electric wire made of a dissimilar metal, wherein a resin is applied to a conductor exposed portion between the side walls and a joint portion of the conductor caulking portion, and the joint portion of the conductor exposed portion and the conductor caulking portion is covered with resin. And terminal connection method.
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