JP5290885B2 - Connection method of conductor and terminal - Google Patents

Connection method of conductor and terminal Download PDF

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JP5290885B2
JP5290885B2 JP2009161294A JP2009161294A JP5290885B2 JP 5290885 B2 JP5290885 B2 JP 5290885B2 JP 2009161294 A JP2009161294 A JP 2009161294A JP 2009161294 A JP2009161294 A JP 2009161294A JP 5290885 B2 JP5290885 B2 JP 5290885B2
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resin material
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crimping
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JP2011018489A (en
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永吾 達川
聡 高村
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THE FURUKAW ELECTRIC CO., LTD.
Furukawa Automotive Systems Inc
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Furukawa Automotive Systems Inc
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本発明は、端子構造、異種金属からなる電線と端子の接続部および接続方法、特にアルミニウム電線(導体にアルミニウムまたはアルミニウム合金を用いた電線)と接続に用いられる銅製の端子構造、端子の接続部および接続方法に関する。 The present invention relates to a terminal structure, a connecting portion and a connecting method of an electric wire and a terminal made of different metals, particularly a copper terminal structure used for connecting to an aluminum electric wire (an electric wire using aluminum or an aluminum alloy as a conductor), and a connecting portion of the terminal. And a connection method.

自動車、OA機器、家電製品の分野において、電気伝導性に優れた銅系材料からなる心線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、車輌の高性能・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輌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ニウム電線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, and home appliances, copper wires having a core wire made of a copper-based material having excellent electrical conductivity have been used as signal lines and power lines. In particular, in the automotive field, the performance of high-performance and high-performance vehicles has been rapidly promoted, so the number of electric wires and control equipment mounted on the vehicle tends to increase. There is the present 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 are attracting particular attention in the automotive field.

しかし、実際にアルミニウム系材料からなる心線を有するアルミニウム電線を自動車用として用いる場合、異種金属接触腐食などの電食が生じる。即ち、アルミニウムは水および銅イオンの存在下では、通常の電食を超える激しい腐食を受ける。なお、アルミニウム電線に限らず、配線工事を行う場合には、電線同士の接続や電線と外部電気機器の端子との接続、あるいは外部電気機器と接続するために電線に接続用端子を装着する必要がある。これらの端子や電線類は前述の通り電気的特性に優れた銅で形成されたものが多い。このため、アルミニウムと銅とを接触・接合しなければならない場合が生じる。 However, when an aluminum electric wire having a core wire made of an aluminum-based material is actually used for automobiles, electrolytic corrosion such as dissimilar metal contact corrosion occurs. That is, aluminum is subject to severe corrosion that exceeds conventional electrolytic corrosion in the presence of water and copper ions. In addition to aluminum wires, when wiring work is performed, it is necessary to attach connection terminals to the wires in order to connect wires, connect wires to terminals of external electrical devices, or connect to external electrical devices. There is. Many of these terminals and wires are made of copper having excellent electrical characteristics as described above. For this reason, there are cases where aluminum and copper must be contacted and joined.

特開2004−111058号公報JP 2004-111058 A

しかしアルミニウムと銅のように標準電極電位の相違する異種金属を接合させた場合、この接触・接合部において上述したような電食が発生する。特に、アルミニウム心線部と接続されるコネクタ類との間の相互の標準電極電位差が大きい。このため雨天の走行や洗車、あるいは結露などによって被水した場合には、電気的に卑であるアルミニウム心線部のイオン化が進行して腐食が促進する。その結果、末端部の接触状態が悪化して電気的特性が不安定になる他、接触抵抗の増大や腐食による線径の減少により電気抵抗の増大、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 dissimilar metals having different standard electrode potentials such as aluminum and copper are joined, electrolytic corrosion as described above occurs at the contact / joint portion. In particular, the standard electrode potential difference between the aluminum core wire and the connectors connected to each other is large. For this reason, when it gets wet by running in the rain, washing a car, or dew condensation, ionization of the aluminum core wire portion which is electrically base proceeds and corrosion is promoted. As a result, the contact state of the end part deteriorates and the electrical characteristics become unstable.In addition, the electrical resistance increases due to the increase in contact resistance and the wire diameter decreases due to corrosion. It is also possible to stop functioning.

このような電食を防止する従来の方法として、コネクタ端子に樹脂などの防水剤を充填してモールディングする方法や防水コネクタを用いる方法などがある。しかし、モールディングを施す場合、その構造や製造工程が複雑になる上、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場合においても、従来防水コネクタが不要とされる部位に防水コネクタを使用することは大幅なコストアップを招くと共に、振動疲労や経年劣化で亀裂などが生じた場合、この亀裂部から雨水等が防水コネクタ内にいったん浸入すると、逆に電食を促進する結果となる。 As conventional methods for preventing such electrolytic corrosion, there are a method in which a connector terminal is filled with a waterproofing agent such as a resin and molding, and a method in which a waterproof connector is used. However, when molding is performed, the structure and the manufacturing process are complicated, and the amount of resin used is large, so that the cost is increased. In addition, even when using a waterproof connector, using a waterproof connector where a conventional waterproof connector is not required causes a significant cost increase, and if cracks occur due to vibration fatigue or deterioration over time, this crack will occur. If rainwater or the like once enters the waterproof connector from the part, it results in promoting electric corrosion.

従って、本発明の目的は、従来の問題点を解決して、結露等によって被水した場合でも、アルミニウム電線の電食の発生を防止して、アルミニウム電線と銅端子のような異種金属からなる電線と端子を、低コストで安定した電気的特性を維持して接続することができる端子構造、電線と端子の接続部および接続方法を提供することにある。 Accordingly, the object of the present invention is to solve the conventional problems and prevent the occurrence of electrolytic corrosion of the aluminum wire even when it is exposed to water by condensation or the like, and is made of a different metal such as an aluminum wire and a copper terminal. An object of the present invention is to provide a terminal structure capable of connecting an electric wire and a terminal at low cost while maintaining stable electrical characteristics, a connecting portion between the electric wire and the terminal, and a connecting method.

本発明の導体と端子の接続方法の態様は、導体の絶縁被覆部および導体部を、前記導体とは異種金属の端子の一部で圧着する導体と端子の接続方法において、粘度が1000mPa・sから38000mPa・sの範囲内にある樹脂材を調製し、前記樹脂材を前記導体部のすべての露出部を覆うように塗布し、前記導体部を前記端子の一部に位置合わせを行い前記導体と前記端子を圧着接続し、前記樹脂材を硬化させることを特徴とする。
The conductor-terminal connection method according to the present invention is the conductor-terminal connection method in which the insulation coating portion and the conductor portion of the conductor are crimped by a part of a terminal of a metal different from the conductor, and the viscosity is 1000 mPa · s. To 38000 mPa · s, the resin material is applied so as to cover all exposed portions of the conductor portion, the conductor portion is aligned with a part of the terminal, and the conductor And the terminal are crimped and connected, and the resin material is cured.

本発明の導体と端子の接続方法の他の態様は、導体の絶縁被覆部および導体部を、前記導体とは異種金属の端子の一部で圧着する導体と端子の接続方法において、粘度が1000mPa・sから38000mPa・sの範囲内にある樹脂材を調製し、前記樹脂材を前記端子の所定の位置に塗布し、前記導体部を前記端子の一部に位置合わせを行い前記導体と前記端子を圧着接続し、前記樹脂材を硬化させ、前記所定の位置は、位置合わせした前記導体部に対応する部分であることを特徴とする。
Another aspect of the method for connecting a conductor and a terminal according to the present invention is a method for connecting a conductor and a terminal in which the insulating coating portion and the conductor portion of the conductor are crimped by a part of a terminal made of a metal different from the conductor. A resin material within a range of s to 38000 mPa · s is prepared, the resin material is applied to a predetermined position of the terminal, and the conductor portion is aligned with a part of the terminal, and the conductor and the terminal And the resin material is cured, and the predetermined position is a portion corresponding to the aligned conductor portion .

本発明の導体と端子の接続方法の他の態様は、前記樹脂材は金属に対する接着強度が−40℃から125℃の範囲において3MPa以上となるように調製し、さらに前記樹脂材の引張り強度が30MPa以上で、且つ弾性率が200MPa以上、1000MPa以下となるように硬化させることを特徴とする。   In another aspect of the conductor and terminal connection method of the present invention, the resin material is prepared such that the adhesive strength to metal is 3 MPa or more in the range of −40 ° C. to 125 ° C., and the tensile strength of the resin material is further increased. It is characterized by being cured so as to be 30 MPa or more and an elastic modulus of 200 MPa or more and 1000 MPa or less.

本発明の導体と端子の接続方法の他の態様は、前記樹脂材が、シリコン系、アクリル系、ウレタン系、ポリアミド系、または、エポキシ系樹脂であることを特徴とする。   Another aspect of the conductor and terminal connection method of the present invention is characterized in that the resin material is a silicon-based, acrylic-based, urethane-based, polyamide-based, or epoxy-based resin.

本発明の導体と端子の接続方法の他の態様は、前記導体がアルミニウムまたはアルミニウム合金からなり、前記端子が銅または銅合金からなっていることを特徴とする。   In another aspect of the conductor and terminal connection method of the present invention, the conductor is made of aluminum or an aluminum alloy, and the terminal is made of copper or a copper alloy.

本発明によると、異種金属である例えばアルミニウムの導体と銅の端子を圧着接続する場合、導体と端子を圧着する前に流動性を有する樹脂を導体もしくは端子に塗布した後、導体と端子を圧着接続し、樹脂を硬化させるので、アルミニウム電線の心線部が密閉されて外部から遮断され、たとえ結露等による被水が生じた場合にも、水がアルミニウム電線と接触することが無いので、安定した電気的特性を維持して異種金属の導体と端子とを接続することができる。 According to the present invention, when crimping and connecting a copper conductor and a dissimilar metal such as an aluminum conductor, the resin and the terminal are coated with a fluid resin before crimping the conductor and the terminal, and then the conductor and the terminal are crimped. Because it is connected and the resin is cured, the core of the aluminum wire is sealed and cut off from the outside, and even if water exposure occurs due to condensation, water does not come into contact with the aluminum wire. Thus, it is possible to connect the conductor of the dissimilar metal and the terminal while maintaining the electrical characteristics.

また、圧着接続した後に樹脂を導体に塗布し硬化させる方法と比較して、端子に導体が隠れてしまって完全な樹脂の塗布作業が難しいといった課題も解決でき、また、外観もきれいな仕上がりを実現することができる。そして、樹脂材を必要な部分のみに塗布して、硬化させるので、複雑な製造工程を必要とせず、低コストで導体と端子とを接続することができる。 Compared with the method of applying resin to the conductor after crimping and curing it, it can solve the problem that the conductor is hidden in the terminal and difficult to apply the resin completely, and the appearance is also beautiful. can do. And since a resin material is apply | coated only to a required part and it hardens | cures, a complicated manufacturing process is not required and a conductor and a terminal can be connected at low cost.

本発明に係る導体と端子の接続方法の第一の実施形態を示す図である。It is a figure which shows 1st embodiment of the connection method of the conductor and terminal which concern on this invention. 本発明に係る導体と端子の接続方法の第二の実施形態を示す図である。It is a figure which shows 2nd embodiment of the connection method of the conductor and terminal which concern on this invention. 本発明に係る端子構造の第一の実施形態を示す上視図である。It is an upper view which shows 1st embodiment of the terminal structure which concerns on this invention. 本発明に係る導体と端子の接続部を示す側面図である。It is a side view which shows the connection part of the conductor and terminal which concern on this invention. 本発明に係る導体と端子の接続部を示す平面図である。It is a top view which shows the connection part of the conductor and terminal which concern on this invention. 本発明に係る導体と端子の接続部を示す断面図である。It is sectional drawing which shows the connection part of the conductor and terminal which concern on this invention. 本発明に係る導体と端子の接続部の、信頼性試験前後における接触抵抗値の変動量を示すグラフである。It is a graph which shows the variation | change_quantity of the contact resistance value before and behind the reliability test of the connection part of the conductor which concerns on this invention, and a terminal.

本発明の実施形態に係る端子、導体と端子の接続部および接続方法を、図1〜図6を用いて以下に説明する。なお、同一機能を有する各構成部については、図示及び説明簡略化のため、同一符号を付して示す。   The terminal, the connection part of a conductor and a terminal, and the connection method which concern on embodiment of this invention are demonstrated below using FIGS. In addition, about each structural part which has the same function, the same code | symbol is attached | subjected and shown for simplification of illustration and description.

図1及び図2は、導体と端子の接続方法を説明する図である。図1(a)〜(d)は、樹脂材9を導体部5に塗布してから導体2と端子3を圧着する接続方法を示している。また、図2(a)〜(d)は、樹脂材9を端子3に塗布してから導体2と端子3を圧着する接続方法を示している。 1 and 2 are diagrams for explaining a method of connecting a conductor and a terminal. 1A to 1D show a connection method in which the conductor 2 and the terminal 3 are crimped after the resin material 9 is applied to the conductor portion 5. 2A to 2D show a connection method in which the conductor 2 and the terminal 3 are crimped after the resin material 9 is applied to the terminal 3.

図1(a)は、導体2と端子3を圧着接続する前の段階を示している。導体2は、導体部5(例えば、アルミ二ウム心線など)を絶縁被覆部4で被覆したものであり、端子3に圧着接続するため、導体2の先端部分の絶縁被覆部4が剥ぎ取られ、導体部5が露出している。端子3は、一端に図示しない別のコネクタと電気的に接続される端子本体8が形成され、他端に導体2の絶縁被覆部4と圧着接続される第1圧着部6が形成されている。また、端子本体8と第1圧着部6との間には、導体部5と圧着接続される第2圧着部7が形成されている。なお、端子3の材質としては、銅もしくは黄銅などが考えられ、導体部5の材質としては、アルミニウムやアルミニウム合金などが考えられる。他にも異種金属であれば様々な組合わせが考えられる。 FIG. 1A shows a stage before the conductor 2 and the terminal 3 are crimped. The conductor 2 is formed by coating a conductor portion 5 (for example, an aluminum core wire) with an insulation coating portion 4, and the insulation coating portion 4 at the tip portion of the conductor 2 is peeled off in order to be crimped to the terminal 3. The conductor part 5 is exposed. The terminal 3 has a terminal main body 8 electrically connected to another connector (not shown) at one end, and a first crimping portion 6 to be crimped and connected to the insulating coating portion 4 of the conductor 2 at the other end. . Further, a second crimping portion 7 that is crimped and connected to the conductor portion 5 is formed between the terminal body 8 and the first crimping portion 6. The material of the terminal 3 may be copper or brass, and the material of the conductor 5 may be aluminum or aluminum alloy. In addition, various combinations of different metals are possible.

図1(b)は、導体2と端子3を圧着接続する前の段階を示しており、導体2の導体部5を覆うように樹脂材9が塗布されている。樹脂材9は導体部5が露出されている部分をすべて覆うように塗布することが望ましく、露出部分を全て覆うことで圧着接続後においても導体部5が外部から完全に遮断され、安定した電気的特性を維持して異種金属の導体と端子とを接続することが可能となる。 FIG. 1B shows a stage before the conductor 2 and the terminal 3 are crimped and connected, and a resin material 9 is applied so as to cover the conductor portion 5 of the conductor 2. It is desirable to apply the resin material 9 so as to cover all the portions where the conductor portions 5 are exposed. By covering all the exposed portions, the conductor portions 5 are completely cut off from the outside even after the crimping connection, and stable electric It becomes possible to connect the conductor and the terminal of the dissimilar metal while maintaining the special characteristics.

樹脂材9は、ある程度流動性を有するものであれば良く、特に粘度が1000mPa・sから38000mPa・sの範囲内にあるものが特に適している。粘度が1000mPa・sより低い場合には、樹脂材9の流動性が大きくなり、所定の位置に樹脂材9を塗布しても樹脂材9が流れてしまうため、圧着接続後に導体部5を完全に外部から遮断できない。また粘度が38000mPa・sより高い場合には、樹脂材9の流動性がなくなり、圧着接続後に導体部5の露出部を覆うことが難しく、導体部5を外部から完全に遮断できない。   The resin material 9 only needs to have a certain degree of fluidity, and those having a viscosity in the range of 1000 mPa · s to 38000 mPa · s are particularly suitable. When the viscosity is lower than 1000 mPa · s, the fluidity of the resin material 9 increases, and the resin material 9 flows even if the resin material 9 is applied at a predetermined position. Cannot be shut off from the outside. Further, when the viscosity is higher than 38000 mPa · s, the fluidity of the resin material 9 is lost, it is difficult to cover the exposed portion of the conductor portion 5 after crimping connection, and the conductor portion 5 cannot be completely blocked from the outside.

さらに、樹脂材9は、金属に対する接着強度が−40℃から125℃の範囲において3MPa以上であることが望ましい。このような条件になるように樹脂材9を調製することによって、金属に対する接着強度が最適となり、圧着後においても導体部5をより完全に外部から遮断するようにすることができる。なお、樹脂材9の材料としては、シリコン系、アクリル系、ウレタン系、ポリアミド系、またはエポキシ系樹脂を使用することが可能であり、またこれらの樹脂を混合したものを使用することも可能である。   Furthermore, the resin material 9 desirably has an adhesive strength to metal of 3 MPa or more in the range of −40 ° C. to 125 ° C. By preparing the resin material 9 so as to satisfy such conditions, the adhesion strength to the metal becomes optimal, and the conductor portion 5 can be more completely cut off from the outside even after crimping. In addition, as a material of the resin material 9, it is possible to use a silicon type, an acrylic type, a urethane type, a polyamide type, or an epoxy type resin, and it is also possible to use a mixture of these resins. is there.

図1(c)は、導体部5を覆うように樹脂材9を塗布した後、導体2と端子3を圧着接続した後を示している。圧着接続は、導体2を端子3の所要の場所に位置合わせし、圧着工具を使用することで、絶縁被覆部4と第1圧着部6が圧着されると同時に、導体部5と第2圧着部7が圧着される。圧着接続後、端子本体8と第2圧着部7の間には切り欠き部11が形成され、第1圧着部6と第2圧着部7の間には切り欠き部12が形成される。そして、圧着接続する際の押圧力で流動性を有する樹脂材9が切り欠き部11、12に押出され、導体部5を完全に外部から遮断できるように導体部5を樹脂材9で覆うことが可能となる。なお、圧着接続する際の押圧力により、導体部5に塗布した樹脂材9が押出され、第2圧着部7と導体部5が電気的に接続されることとなる。 FIG. 1C shows a state after the resin material 9 is applied so as to cover the conductor portion 5 and then the conductor 2 and the terminal 3 are crimped and connected. In the crimping connection, the conductor 2 is aligned with a required place of the terminal 3 and a crimping tool is used, so that the insulation coating portion 4 and the first crimping portion 6 are crimped simultaneously with the conductor portion 5 and the second crimping. Part 7 is crimped. After the crimping connection, a notch 11 is formed between the terminal body 8 and the second crimping part 7, and a notch 12 is formed between the first crimping part 6 and the second crimping part 7. Then, the resin material 9 having fluidity is pushed into the notches 11 and 12 by the pressing force at the time of crimping connection, and the conductor portion 5 is covered with the resin material 9 so that the conductor portion 5 can be completely cut off from the outside. Is possible. In addition, the resin material 9 applied to the conductor portion 5 is pushed out by the pressing force at the time of the crimping connection, and the second crimping portion 7 and the conductor portion 5 are electrically connected.

図1(d)は、導体2と端子3を圧着接続した後、樹脂材9を硬化させたものである。樹脂材9に紫外線を当てることや、熱を加えることで、樹脂材9を樹脂材10に硬化させ、異種金属の導体と端子の信頼性の高い接続を実現することが可能となる。また、樹脂材10は、引張り強度が30MPa以上であり、弾性率が200MPa〜1000MPaとなるように硬化させることが特に望ましい。この条件になるように樹脂材9を硬化させることによって、圧着接続後に導体部5を完全に外部から遮断できると共に、長期間、外部環境で使用される場合においても、電気特性の劣化を最小限に抑えることが可能となる。 FIG. 1D shows the resin material 9 cured after the conductor 2 and the terminal 3 are crimped and connected. By applying ultraviolet light to the resin material 9 or applying heat, the resin material 9 can be cured to the resin material 10 and a highly reliable connection between the conductor of the dissimilar metal and the terminal can be realized. Further, it is particularly desirable that the resin material 10 is cured so that the tensile strength is 30 MPa or more and the elastic modulus is 200 MPa to 1000 MPa. By curing the resin material 9 so as to satisfy this condition, the conductor portion 5 can be completely cut off from the outside after the crimping connection, and the deterioration of electrical characteristics is minimized even when used in an external environment for a long period of time. It becomes possible to suppress to.

次に、図2(a)〜(d)を用いて、導体と端子との別の接続方法を説明する。図2(a)〜(d)の接続方法は、図1の接続方法とは、樹脂材9を塗布する場所を異ならせたものである。 Next, another method for connecting a conductor and a terminal will be described with reference to FIGS. The connection method of FIGS. 2A to 2D is different from the connection method of FIG. 1 in the place where the resin material 9 is applied.

図2(a)は図1(a)と同様であり、導体2と端子3を圧着接続する前の段階を示している。図2(b)は、図1(b)とは、樹脂材9を塗布する位置を異ならせたものであり、流動性のある樹脂材9を端子3側に塗布している。より具体的には、導体部5と第2圧着部7を圧着接続する前に位置合わせを行なうが、導体部5が位置合わせさせられる部分に対応するように樹脂材9を第2圧着部7に塗布することとなる。また、樹脂材9の塗布量としては、圧着接続する際の押圧力で流動性を有する樹脂材9が切り欠き部11、12に押出されることによって、導体部5を完全に外部から遮断できる塗布量であればよい。この樹脂材9の塗布量は予め決めておけば、最低限の塗布量で導体部5を完全に外部から遮断することが可能となる。   FIG. 2A is the same as FIG. 1A and shows a stage before the conductor 2 and the terminal 3 are connected by crimping. FIG. 2B is different from FIG. 1B in that the position where the resin material 9 is applied is different, and the resin material 9 having fluidity is applied to the terminal 3 side. More specifically, the positioning is performed before the conductor portion 5 and the second crimping portion 7 are crimped and connected, but the resin material 9 is attached to the second crimping portion 7 so as to correspond to the portion where the conductor portion 5 is aligned. It will be applied to. Further, the amount of the resin material 9 applied is such that the conductor portion 5 can be completely cut off from the outside by extruding the resin material 9 having fluidity to the notches 11 and 12 by the pressing force at the time of crimping connection. Any coating amount may be used. If the application amount of the resin material 9 is determined in advance, the conductor portion 5 can be completely blocked from the outside with the minimum application amount.

図2(c)は図1(c)と同様であり、端子3側に樹脂材9を塗布した後、導体2と端子3を圧着接続した後を示している。圧着接続は、導体2を端子3の樹脂材9が塗布されている所要の場所に位置合わせし、圧着工具を使用することで、絶縁被覆部4と第1圧着部6が圧着されると同時に、導体部5と第2圧着部7が圧着される。圧着接続後、端子本体8と第2圧着部7の間には切り欠き部11が形成され、第1圧着部6と第2圧着部7の間には切り欠き部12が形成される。そして、圧着接続する際の押圧力で流動性を有する樹脂材9が切り欠き部11、12に押出されることによって、導体部5を完全に外部から遮断できるように樹脂材9で覆うことが可能となる。なお、圧着接続する際の押圧力により、導体部5に塗布した樹脂材9が押出され、第2圧着部7と導体部5が電気的に接続されることとなる。 FIG. 2C is the same as FIG. 1C, and shows a state after the resin material 9 is applied to the terminal 3 side and then the conductor 2 and the terminal 3 are crimped and connected. In the crimping connection, the conductor 2 is positioned at a required place where the resin material 9 of the terminal 3 is applied, and a crimping tool is used so that the insulation coating portion 4 and the first crimping portion 6 are crimped simultaneously. The conductor part 5 and the second crimping part 7 are crimped. After the crimping connection, a notch 11 is formed between the terminal body 8 and the second crimping part 7, and a notch 12 is formed between the first crimping part 6 and the second crimping part 7. Then, the resin material 9 having fluidity is pushed into the cutout portions 11 and 12 by the pressing force at the time of the crimping connection, so that the conductor portion 5 can be covered with the resin material 9 so as to be completely cut off from the outside. It becomes possible. In addition, the resin material 9 applied to the conductor portion 5 is pushed out by the pressing force at the time of the crimping connection, and the second crimping portion 7 and the conductor portion 5 are electrically connected.

図2(d)は図1(d)と同様であり、導体2と端子3を圧着接続した後、樹脂材9を硬化させたものである。樹脂材9に紫外線を当てることや、熱を加えることで、樹脂材9を樹脂材10に硬化させ、異種金属の導体と端子の信頼性の高い接続を実現することが可能となる。また、樹脂材10は、引張り強度が30MPa以上であり、弾性率が200MPa〜1000MPaとなるように硬化させることが特に望ましい。このような条件になるように樹脂材9を硬化させることによって、圧着後に導体部5を完全に外部から遮断できると共に、長期間、外部環境で使用される場合においても、電気特性の劣化を最小限に抑えることが可能となる。 FIG. 2D is the same as FIG. 1D, and the resin material 9 is cured after the conductor 2 and the terminal 3 are crimped and connected. By applying ultraviolet light to the resin material 9 or applying heat, the resin material 9 can be cured to the resin material 10 and a highly reliable connection between the conductor of the dissimilar metal and the terminal can be realized. Further, it is particularly desirable that the resin material 10 is cured so that the tensile strength is 30 MPa or more and the elastic modulus is 200 MPa to 1000 MPa. By curing the resin material 9 so as to satisfy such conditions, the conductor portion 5 can be completely cut off from the outside after the crimping, and the deterioration of the electrical characteristics is minimized even when used in an external environment for a long period of time. It becomes possible to limit to the limit.

以上のように、異種金属である例えばアルミニウムの導体と銅の端子を圧着接続する場合、導体と端子を圧着する前に流動性を有する樹脂を導体もしくは端子に塗布した後、導体と端子を圧着接続し、樹脂を硬化させるので、アルミニウム電線の心線部が密閉されて外部から遮断され、たとえ結露等による被水が生じた場合にも、水がアルミニウム電線と接触することが無いので、安定した電気的特性を維持して異種金属の導体と端子とを接続することができる。 As described above, for example, when crimping and connecting a dissimilar metal conductor such as an aluminum conductor and a copper terminal, a fluid resin is applied to the conductor or terminal before crimping the conductor and the terminal, and then the conductor and the terminal are crimped. Because it is connected and the resin is cured, the core of the aluminum wire is sealed and cut off from the outside, and even if water exposure occurs due to condensation, water does not come into contact with the aluminum wire. Thus, it is possible to connect the conductor of the dissimilar metal and the terminal while maintaining the electrical characteristics.

また、圧着接続した後に樹脂を導体に塗布し硬化させる方法と比較して、端子に導体が隠れてしまって完全な樹脂の塗布作業が難しいといった課題も解決でき、また、外観もきれいな仕上がりを実現することができる。そして、樹脂材を必要な部分のみに塗布して、硬化させるので、複雑な製造工程を必要とせず、低コストで導体と端子とを接続することができる。 Compared with the method of applying resin to the conductor after crimping and curing it, it can solve the problem that the conductor is hidden in the terminal and difficult to apply the resin completely, and the appearance is also beautiful. can do. And since a resin material is apply | coated only to a required part and it hardens | cures, a complicated manufacturing process is not required and a conductor and a terminal can be connected at low cost.

次に、異種金属の導体と端子を圧着する前に流動性を有する樹脂を導体2もしくは端子3に塗布する場合の、最適な端子構造について、図3を用いて説明する。図3は圧着する前の端子3を示している。なお、図3では導体2を省略している。   Next, an optimum terminal structure in the case where a resin having fluidity is applied to the conductor 2 or the terminal 3 before the conductor and the terminal of the dissimilar metal are crimped will be described with reference to FIG. FIG. 3 shows the terminal 3 before being crimped. In FIG. 3, the conductor 2 is omitted.

図3の端子3は、一端に図示しない別のコネクタと電気的に接続される端子本体8が形成され、他端に図示しない導体2の絶縁被覆部4と圧着接続される第1圧着部6が形成されている。また、端子本体8と第1圧着部6との間には、図示しない導体2の導体部5と圧着接続される第2圧着部7が形成されている。圧着接続前の第2圧着部7は、導体部5と位置合わせさせられる底面部7(a)と底面部7(a)から端子3の幅方向に延伸するように形成させられた2つの側面部7(b)で形成されている。   The terminal 3 of FIG. 3 has a terminal body 8 electrically connected to another connector (not shown) at one end, and a first crimping portion 6 to be crimped and connected to the insulating coating 4 of the conductor 2 (not shown) at the other end. Is formed. Further, a second crimping portion 7 is formed between the terminal body 8 and the first crimping portion 6 so as to be crimped and connected to the conductor portion 5 of the conductor 2 (not shown). The second crimping part 7 before the crimping connection has two side surfaces formed so as to extend in the width direction of the terminal 3 from the bottom part 7 (a) aligned with the conductor part 5 and the bottom part 7 (a). Part 7 (b) is formed.

さらに、第2圧着部7の内面には、端子3の幅方向に複数のセレーション13が形成されている。このセレーション13は、導体2と端子3が引張られた場合でも、強固な接続が維持できるように凹凸構造となっている。しかしながら、流動性を有する樹脂を導体もしくは端子に塗布した後に圧着接続を行うと、このセレーション13により、端子3の長手方向における樹脂の流動性を阻害することとなる。   Further, a plurality of serrations 13 are formed on the inner surface of the second crimping portion 7 in the width direction of the terminal 3. This serration 13 has an uneven structure so that a strong connection can be maintained even when the conductor 2 and the terminal 3 are pulled. However, when crimp connection is performed after applying a resin having fluidity to a conductor or terminal, the serration 13 inhibits the fluidity of the resin in the longitudinal direction of the terminal 3.

そこで、樹脂の流動性を促進するように、第2圧着部7の内面に端子3の長手方向に溝部14を形成する。この溝部14は複数あることが望ましく、特に、圧着接続前の第2圧着部7の底面部7(a)および2つの側面部7(b)にそれぞれ底面溝部14(a)、および側面溝部14(b)を形成させることが好ましい。このように溝部14を形成することで、流動性を有する樹脂を導体もしくは端子に塗布した後に圧着接続した場合においても、圧着接続する際の押圧力で流動性を有する樹脂が溝部14を通って押出され、導体部5を外部から完全に遮断することができる。   Therefore, a groove portion 14 is formed in the longitudinal direction of the terminal 3 on the inner surface of the second crimping portion 7 so as to promote the fluidity of the resin. It is desirable that there are a plurality of the groove portions 14, and in particular, the bottom surface groove portion 14 (a) and the side surface groove portion 14 on the bottom surface portion 7 (a) and the two side surface portions 7 (b) of the second pressure bonding portion 7 before the crimp connection. It is preferable to form (b). By forming the groove portion 14 in this way, even when the resin having fluidity is applied to the conductor or terminal and then crimped and connected, the resin having fluidity passes through the groove portion 14 by the pressing force at the time of crimping connection. The conductor portion 5 can be completely blocked from the outside by being extruded.

次に、図4〜6を用いて、以上説明した接続方法により接続された導体2と端子3の接続部1について説明する。図4は、導体2と端子3の接続部1の側面図であり、図5は、導体2と端子3の接続部1の平面図である。また、図4のA−A断面図、B−B断面図、C-C断面図を図6(a)、図6(b)、図6(c)にそれぞれ示したものである。 Next, the connection part 1 of the conductor 2 and the terminal 3 connected by the connection method demonstrated above is demonstrated using FIGS. FIG. 4 is a side view of the connecting portion 1 between the conductor 2 and the terminal 3, and FIG. 5 is a plan view of the connecting portion 1 between the conductor 2 and the terminal 3. Moreover, the AA sectional view, BB sectional view, and CC sectional view of FIG. 4 are respectively shown in FIG. 6 (a), FIG. 6 (b), and FIG. 6 (c).

図4に示すように導体2と端子3の接続部1は、圧着接続する際の押圧力により切り欠き部11、12から押出された樹脂材9が、第1圧着部6、第2圧着部7にはみ出るように広がり、図示しない導体部5を外部から遮断する。その後、樹脂材9を樹脂材10に硬化させることにより信頼性の高い導体2と端子3の接続部1を実現することができる。 As shown in FIG. 4, the connecting portion 1 between the conductor 2 and the terminal 3 has a resin material 9 extruded from the notches 11 and 12 by a pressing force when crimped and connected, as a first crimping portion 6 and a second crimping portion. 7, the conductor portion 5 (not shown) is blocked from the outside. After that, by curing the resin material 9 to the resin material 10, a highly reliable connection portion 1 between the conductor 2 and the terminal 3 can be realized.

図5に示すように導体2と端子3の接続部1は、第1圧着部6と第2圧着部7の間の切り欠き部12からその導体部の一部5(a)が露出している。更に、第2圧着部7と端子本体8の間の切り欠き部11から、その導体部の一部5(b)が露出している。この露出した導体部の一部5(a)、5(b)は、流動性を有する樹脂材9が圧着接続する際の押圧力により、第1圧着部6、第2圧着部7にはみ出るように広がることによって外部から遮断されることとなる。 As shown in FIG. 5, in the connecting portion 1 between the conductor 2 and the terminal 3, a part 5 (a) of the conductor portion is exposed from the notch portion 12 between the first crimping portion 6 and the second crimping portion 7. Yes. Furthermore, a part 5 (b) of the conductor part is exposed from the notch part 11 between the second crimping part 7 and the terminal body 8. The exposed portions 5 (a) and 5 (b) of the conductor portion protrude from the first pressure-bonding portion 6 and the second pressure-bonding portion 7 due to the pressing force when the resin material 9 having fluidity is pressure-bonded and connected. It will be cut off from the outside by spreading to.

図6(a)は図4のA−A断面図を示したものであり、端子本体8と第2圧着部7とにそれぞれ一体的に形成されている連結部15に導体の一部5(b)が配置されている。導体の一部5(b)が全て覆われるように硬化された樹脂材10が配置されている。図6(b)は図4のB−B断面図を示したものであり、流動性を有する樹脂材9が圧着接続する際の押圧力により、第2圧着部7と導体部5の接触面から押し出され、導体部5と第2圧着部7が電気的に接続されることとなる。図6(c)は図4のC−C断面図を示したものであり、第1圧着部6が絶縁被覆部4を圧着しており、樹脂材10が第1圧着部6と絶縁被覆部4の間に一部入り込んでいる。 FIG. 6A is a cross-sectional view taken along the line AA of FIG. 4, and a conductor part 5 ( b) is arranged. A cured resin material 10 is disposed so that the conductor part 5 (b) is entirely covered. FIG. 6B is a cross-sectional view taken along the line B-B in FIG. 4, and the contact surface between the second crimping portion 7 and the conductor portion 5 due to the pressing force when the resin material 9 having fluidity is crimped and connected. The conductor portion 5 and the second crimping portion 7 are electrically connected. FIG. 6C is a cross-sectional view taken along the line C-C in FIG. 4. The first crimping portion 6 crimps the insulation coating portion 4, and the resin material 10 is the first crimping portion 6 and the insulation coating portion. Part of it is between 4.

次に、本発明の導体と端子の接続部を実施例によって更に詳細に説明する。硬化前の樹脂の粘度を1000mPa・sから38000mPa・sの範囲内に調製した時、硬化前の樹脂の金属に対する接着強度、および硬化後の樹脂の引張強度および弾性率をそれぞれ変化させて信頼性試験を行った。信頼性試験前後の接触抵抗値の変動量を測定した結果を表1および図7に示す。 Next, the connection part between the conductor and the terminal of the present invention will be described in more detail with reference to examples. When the viscosity of the resin before curing is adjusted within the range of 1000 mPa · s to 38000 mPa · s, the adhesive strength of the resin before curing to the metal, and the tensile strength and elastic modulus of the resin after curing are changed to be reliable. A test was conducted. Table 1 and FIG. 7 show the results of measuring the fluctuation amount of the contact resistance value before and after the reliability test.

信頼性試験は、はじめに温度120℃の環境下で120時間放置した後、35℃の塩水(5%NaCl)を96時間噴霧した後、温度85℃、湿度95%RHの環境下で96時間放置するものである。そして、信頼性試験前後における接触抵抗値変動の判定基準は、2.5mΩ以下となったものを合格(○)とし、2.5mΩより大きくなったものを不合格(×)とした。 In the reliability test, the sample was first left for 120 hours in an environment of 120 ° C., then sprayed with salt water (5% NaCl) at 35 ° C. for 96 hours, and then left in an environment of temperature 85 ° C. and humidity 95% RH for 96 hours. To do. And as for the judgment standard of the contact resistance value fluctuation before and after the reliability test, a value of 2.5 mΩ or less was accepted (◯), and a value larger than 2.5 mΩ was rejected (x).

表1は、樹脂の条件である硬化前の樹脂の金属に対する接着強度、および硬化後の樹脂の引張強度および弾性率をA〜T条件のようにそれぞれ変化させ、各条件において接触抵抗値の変動量を測定した結果を示している。また、各条件について、導体と端子の接続部のサンプルをそれぞれ10個づつ作製し、同じ条件での接触抵抗値の変動量の平均値および最小値、最大値をそれぞれ測定した。 Table 1 shows the conditions of the resin, the adhesive strength of the resin before curing to the metal, and the tensile strength and elastic modulus of the resin after curing as shown in the A to T conditions. The result of measuring the quantity is shown. In addition, for each condition, ten samples of the connection portion between the conductor and the terminal were prepared, and the average value, the minimum value, and the maximum value of the variation amount of the contact resistance value under the same condition were measured.

また、図7は、表1の結果について横軸をA〜Tの各条件とし、縦軸に接触抵抗値の変動量として、グラフ化したものである。なお、接触抵抗値の変動量の最小値、最大値の範囲を縦の棒軸で表し、平均値を●でプロットしている。 FIG. 7 is a graph of the results in Table 1, with the horizontal axis as the conditions A to T and the vertical axis as the amount of change in the contact resistance value. In addition, the range of the minimum value and the maximum value of the fluctuation amount of the contact resistance value is represented by a vertical bar axis, and the average value is plotted by ●.

Figure 0005290885
Figure 0005290885

表1および図7から、樹脂材9は、硬化前における金属に対する接着強度が−40℃から125℃の範囲において3MPa以上のとき、接触抵抗値の変動はほぼ安定していることが確認できる。また、硬化後の樹脂材10を引張り強度が30MPa以上、弾性率が200MPa〜1000MPaとなるようにすることによって、信頼性試験前後の接触抵抗値の変動量を、2.5mΩ以下とすることが確認できる。この引張り強度および弾性率が高すぎても低すぎても、端子3または絶縁被覆部4などの線膨張率等の違いにより信頼性試験を行なうと樹脂材10が剥離し、その結果、剥離部分からの水分進入によって腐食が進行し、接触抵抗値が変動する要因になったと思われる。 From Table 1 and FIG. 7, it can be confirmed that the resin material 9 has a substantially stable variation in the contact resistance value when the adhesive strength to the metal before curing is 3 MPa or more in the range of −40 ° C. to 125 ° C. Further, by making the cured resin material 10 have a tensile strength of 30 MPa or more and an elastic modulus of 200 MPa to 1000 MPa, the amount of change in the contact resistance value before and after the reliability test may be 2.5 mΩ or less. I can confirm. Whether the tensile strength and elastic modulus are too high or too low, the resin material 10 peels off when a reliability test is performed due to a difference in the linear expansion coefficient of the terminal 3 or the insulation coating portion 4. It seems that corrosion progressed due to moisture intrusion from the surface, and that the contact resistance value fluctuated.

1 電線と端子の接続部2 導体3 端子4 絶縁被覆部5 導体部6 第1圧着部7 第2圧着部8 端子本体9、10 樹脂材11、12 切り欠き部13 セレーション14 溝部15 連結部 DESCRIPTION OF SYMBOLS 1 Connection part of an electric wire and a terminal 2 Conductor 3 Terminal 4 Insulation coating | cover part 5 Conductor part 6 1st crimping part 7 2nd crimping part 8 Terminal body 9, 10 Resin material 11, 12 Notch part 13 Serration 14 Groove part 15 Connection part

Claims (5)

導体の絶縁被覆部および導体部を、前記導体とは異種金属の端子の一部で圧着する導体と端子の接続方法において、
粘度が1000mPa・sから38000mPa・sの範囲内にある樹脂材を調製し、
前記樹脂材を前記導体部のすべての露出部を覆うように塗布し、
前記導体部を前記端子の一部に位置合わせを行い前記導体と前記端子を圧着接続し、
前記樹脂材を硬化させることを特徴とする導体と端子の接続方法。
In the method of connecting a conductor and a terminal, wherein the conductor insulation coating and the conductor are crimped with a part of a terminal of a metal different from the conductor,
A resin material having a viscosity in the range of 1000 mPa · s to 38000 mPa · s,
Apply the resin material so as to cover all exposed portions of the conductor portion,
The conductor portion is aligned with a part of the terminal and the conductor and the terminal are crimped and connected,
A method of connecting a conductor and a terminal, wherein the resin material is cured.
導体の絶縁被覆部および導体部を、前記導体とは異種金属の端子の一部で圧着する導体と端子の接続方法において、
粘度が1000mPa・sから38000mPa・sの範囲内にある樹脂材を調製し、
前記樹脂材を前記端子の所定の位置に塗布し、
前記導体部を前記端子の一部に位置合わせを行い前記導体と前記端子を圧着接続し、
前記樹脂材を硬化させ
前記所定の位置は、位置合わせした前記導体部に対応する部分であることを特徴とする導体と端子の接続方法。
In the method of connecting a conductor and a terminal, wherein the conductor insulation coating and the conductor are crimped with a part of a terminal of a metal different from the conductor,
A resin material having a viscosity in the range of 1000 mPa · s to 38000 mPa · s,
Applying the resin material to a predetermined position of the terminal,
The conductor portion is aligned with a part of the terminal and the conductor and the terminal are crimped and connected,
Curing the resin material ;
The method for connecting a conductor and a terminal, wherein the predetermined position is a portion corresponding to the aligned conductor portion .
前記樹脂材は金属に対する接着強度が−40℃から125℃の範囲において3MPa以上となるように調製し、さらに前記樹脂材の引張り強度が30MPa以上で、且つ弾性率が200MPa以上、1000MPa以下となるように硬化させることを特徴とする請求項1または請求項2に記載の導体と端子の接続方法。 The resin material is prepared so that the adhesive strength to metal is 3 MPa or more in the range of −40 ° C. to 125 ° C., and the tensile strength of the resin material is 30 MPa or more and the elastic modulus is 200 MPa or more and 1000 MPa or less. The method for connecting a conductor and a terminal according to claim 1 or 2 , wherein the method is cured as described above. 前記樹脂材が、シリコン系、アクリル系、ウレタン系、ポリアミド系、または、エポキシ系樹脂であることを特徴とする請求項1〜のいずれか1項に記載の導体と端子の接続方法。 The method for connecting a conductor and a terminal according to any one of claims 1 to 3 , wherein the resin material is a silicon-based, acrylic-based, urethane-based, polyamide-based, or epoxy-based resin. 前記導体がアルミニウムまたはアルミニウム合金からなり、前記端子が銅または銅合金からなっていることを特徴とする請求項1〜のいずれか1項に記載の導体と端子の接続方法。
The conductor and terminal connection method according to any one of claims 1 to 4 , wherein the conductor is made of aluminum or an aluminum alloy, and the terminal is made of copper or a copper alloy.
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