JP5065993B2 - Crimp terminal for aluminum wire - Google Patents

Crimp terminal for aluminum wire Download PDF

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JP5065993B2
JP5065993B2 JP2008134083A JP2008134083A JP5065993B2 JP 5065993 B2 JP5065993 B2 JP 5065993B2 JP 2008134083 A JP2008134083 A JP 2008134083A JP 2008134083 A JP2008134083 A JP 2008134083A JP 5065993 B2 JP5065993 B2 JP 5065993B2
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plating layer
aluminum
crimping
crimp terminal
electric wire
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JP2009283288A (en
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貴哉 近藤
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Yazaki Corp
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Yazaki Corp
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/02—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/02—Contact members
    • H01R13/03—Contact members characterised by the material, e.g. plating, or coating materials
    • 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
    • H01R4/10—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 effected solely by twisting, wrapping, bending, crimping, or other permanent deformation
    • H01R4/18—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 effected solely by twisting, wrapping, bending, crimping, or other permanent deformation by crimping
    • H01R4/183—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 effected solely by twisting, wrapping, bending, crimping, or other permanent deformation by crimping for cylindrical elongated bodies, e.g. cables having circular cross-section
    • H01R4/184—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 effected solely by twisting, wrapping, bending, crimping, or other permanent deformation by crimping for cylindrical elongated bodies, e.g. cables having circular cross-section comprising a U-shaped wire-receiving portion
    • H01R4/185—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 effected solely by twisting, wrapping, bending, crimping, or other permanent deformation by crimping for cylindrical elongated bodies, e.g. cables having circular cross-section comprising a U-shaped wire-receiving portion combined with a U-shaped insulation-receiving portion
    • 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
    • H01R4/58—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 characterised by the form or material of the contacting members
    • H01R4/62—Connections between conductors of different materials; Connections between or with aluminium or steel-core aluminium conductors

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Connections Effected By Soldering, Adhesion, Or Permanent Deformation (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)

Description

本発明は、アルミ電線用圧着端子に関する。   The present invention relates to a crimp terminal for an aluminum electric wire.

従来、アルミ電線用圧着端子としては、アルミ電線のアルミ素線からなる導体部に加締められる圧着部に対してセレーションを設けることにより、アルミ素線の表面に形成された酸化皮膜を破壊してアルミ電線と圧着端子とを接触導通させる構造が知られている（例えば、特許文献１参照）。   Conventionally, as a crimp terminal for an aluminum wire, an oxide film formed on the surface of the aluminum wire is destroyed by providing serrations on the crimped portion crimped to the conductor portion made of the aluminum wire of the aluminum wire. A structure in which an aluminum electric wire and a crimp terminal are brought into contact with each other is known (see, for example, Patent Document 1).

また、端子の圧着部に形成されたセレーションについては、セレーションを構成する溝の深さとアルミ電線のアルミ素線の径との比を0.33以上、溝数を３以上にするなどの検討も行われている（例えば、特許文献２参照）。   In addition, with regard to serrations formed in the crimping part of the terminal, studies have been made such as making the ratio of the depth of the grooves constituting the serration and the diameter of the aluminum wire of the aluminum wire 0.33 or more and the number of grooves 3 or more. (For example, refer to Patent Document 2).

さらに、端子などの基材上に形成されるめっき層としては、ニッケルなどからなる下地層と、銅などからなる中間層と、銀などからなる最表層とを有する被覆層中に含まれる銅の総量を被覆面積１m２あたり0.025mol以下とした可動接点用銀被膜複合材料が知られている（例えば、特許文献３参照）。
特開２００３−２４９２８４号公報 特開２００７−１７３２１５号公報 特開２００７−２９１５０９号公報 Furthermore, as a plating layer formed on a base material such as a terminal, copper contained in a coating layer having an underlayer made of nickel, an intermediate layer made of copper, etc., and an outermost layer made of silver, etc. A silver film composite material for movable contacts having a total amount of 0.025 mol or less per 1 m 2 of the covering area is known (see, for example, Patent Document 3).
JP 2003-249284 A JP 2007-173215 A JP 2007-291509 A

アルミ電線に圧着される圧着端子は、アルミ電線との接触面に錫（Ｓｎ）などのアルミ電線のアルミニウム（Ａｌ）と凝着作用を有するめっき層が形成されている。そして、導体部の表面に形成された酸化皮膜を破壊することにより、導体部の新生面（素地）を露出させ、Ｓｎ−Ａｌとの金属間結合（凝着）によってアルミ電線と端子とを導通接触させている。   The crimp terminal to be crimped to the aluminum electric wire has a plating layer having an adhesion action with aluminum (Al) of the aluminum electric wire such as tin (Sn) on the contact surface with the aluminum electric wire. Then, by destroying the oxide film formed on the surface of the conductor part, the new surface (substrate) of the conductor part is exposed, and the aluminum electric wire and the terminal are brought into conductive contact by intermetallic bonding (adhesion) with Sn-Al. I am letting.

そこで、Ｓｎ−Ａｌの結合面としての凝着面積を稼ぐため、上記の特許文献１，２に記載された技術のように端子におけるアルミ電線との接触面にセレーションを設けた圧着端子がある。すなわち、このような圧着端子は、圧着部でアルミ電線の導体部を圧着する際に、導体部の表面に形成された酸化皮膜をセレーションによって破壊させて導体部の新生面の面積を増加させてＳｎ−Ａｌの凝着面積を稼いでいる。   Therefore, there is a crimp terminal in which serrations are provided on the contact surface of the terminal with the aluminum electric wire as in the techniques described in Patent Documents 1 and 2 in order to increase the adhesion area as the Sn—Al bonding surface. That is, when such a crimp terminal crimps the conductor portion of the aluminum electric wire at the crimp portion, the oxide film formed on the surface of the conductor portion is destroyed by serration to increase the area of the new surface of the conductor portion. -Earn Al adhesion area.

しかしながら、端子の圧着部の接触面に形成されためっき層の表面にも酸化皮膜が形成されている。そこで、めっき層表面の酸化皮膜を破壊させてめっき層の新生面を露出させる必要があるが、錫などからなるめっき層は比較的硬度が低い。このため、めっき層表面の酸化皮膜は、圧着部でアルミ電線の導体部を圧着する際にめっき層の変形に追従して伸びてしまい、圧着部による導体部の圧縮率が高い領域ではめっき層表面の酸化皮膜が破壊されない可能性があった。   However, an oxide film is also formed on the surface of the plating layer formed on the contact surface of the crimping portion of the terminal. Therefore, it is necessary to break the oxide film on the surface of the plating layer to expose the new surface of the plating layer, but the plating layer made of tin or the like has a relatively low hardness. For this reason, the oxide film on the surface of the plating layer expands following the deformation of the plating layer when the conductor portion of the aluminum electric wire is crimped by the crimping portion, and in the region where the compressibility of the conductor portion by the crimping portion is high, the plating layer There was a possibility that the oxide film on the surface was not destroyed.

なお、導体部の圧縮率とは、圧着部による圧着後の導体部の断面積に対する圧着前の導体部の断面積の比の値とする。従って、例えば、強い圧着力で導体部を圧着した場合には圧縮率が低くなり、弱い圧着力で導体部を圧着した場合には圧縮率が高くなる。   The compression ratio of the conductor portion is a value of the ratio of the cross-sectional area of the conductor portion before crimping to the sectional area of the conductor portion after crimping by the crimping portion. Therefore, for example, when the conductor part is crimped with a strong crimping force, the compression ratio is low, and when the conductor part is crimped with a weak crimping force, the compression ratio is high.

また、圧着部による導体部の圧縮率を低くすると、めっき層の変形量が増加してめっき層表面に形成された酸化皮膜が破壊され、めっき層の新生面露出面積が大きくなり、凝着面積を稼ぐことができる。   Also, if the compression ratio of the conductor part by the crimping part is lowered, the deformation amount of the plating layer increases, the oxide film formed on the surface of the plating layer is destroyed, the exposed area of the new surface of the plating layer increases, and the adhesion area is reduced. You can earn.

しかしながら、導体部の圧縮率を低くしてしまうと、アルミ電線では銅素線からなる銅電線に比べて機械的強度が劣るため、セレーションによるアルミ素線の破断やセレーションが形成されていない圧着部でも圧着部自体によるアルミ素線の破断が起こる可能性があった。   However, if the compressibility of the conductor part is lowered, the mechanical strength of the aluminum wire is inferior to that of the copper wire made of copper wire, so the crimped portion where the aluminum wire is not broken or serrated by serration. However, there was a possibility that the aluminum wire was broken by the crimping part itself.

また、導体部の圧縮率を低くしてしまうと、圧着部の加締めによって発生する圧着部自体の反発（スプリングバック）も大きくなり、圧着部とアルミ素線との間のすき間が大きくなり、導体部と圧着部との圧着強度が低下してしまう可能性があった。   Moreover, if the compression ratio of the conductor part is lowered, the repulsion (spring back) of the crimping part itself caused by crimping of the crimping part also increases, and the gap between the crimping part and the aluminum element wire becomes large, There was a possibility that the crimping strength between the conductor part and the crimping part would decrease.

そこで、この発明は、凝着面積を稼ぐための過度な加工をする必要がなく、高い圧縮率の領域でも安定した接続信頼性を得ることができるアルミ電線用圧着端子の提供を目的としている。   Accordingly, an object of the present invention is to provide a crimp terminal for an aluminum electric wire that does not require excessive processing for increasing the adhesion area and can obtain stable connection reliability even in a high compression rate region.

請求項１記載のアルミ電線用圧着端子は、アルミニウム系金属の複数の素線からなる導体部を有するアルミ電線の前記導体部に圧着され、銅系金属からなる圧着部と、この圧着部の前記導体部と接触する接触面に設けられ、前記導体部に対して凝着作用を有するめっき層と、このめっき層の表面に設けられ、前記めっき層よりも硬度が高い高硬度めっき層とを有することを特徴とする。   The crimp terminal for an aluminum wire according to claim 1 is crimped to the conductor portion of an aluminum electric wire having a conductor portion made of a plurality of aluminum-based metal wires, and the crimp portion made of a copper-based metal, and the crimp portion of the crimp portion. A plating layer provided on a contact surface in contact with the conductor portion and having an adhesion action on the conductor portion; and a high-hardness plating layer provided on a surface of the plating layer and having a hardness higher than that of the plating layer. It is characterized by that.

請求項２記載のアルミ電線用圧着端子は、前記めっき層は、錫系金属からなることを特徴とする。   The crimp terminal for an aluminum electric wire according to claim 2, wherein the plating layer is made of a tin-based metal.

請求項３記載のアルミ電線用圧着端子は、前記高硬度めっき層は、前記めっき層の厚さよりも薄いことを特徴とする。   The crimp terminal for an aluminum electric wire according to claim 3, wherein the high-hardness plating layer is thinner than a thickness of the plating layer.

請求項１のアルミ電線用圧着端子は、めっき層よりも硬度が高い高硬度めっき層がめっき層の表面に設けられているので、圧着部でアルミ電線の導体部を圧着する際に高硬度めっき層が破壊され易くなっている。そして、高硬度めっき層の表面に形成された酸化皮膜が高硬度めっき層の破壊と共に破壊され、めっき層の新生面が露出される。   The crimp terminal for an aluminum electric wire according to claim 1 is provided with a high-hardness plating layer having a higher hardness than the plating layer on the surface of the plating layer. The layer is easily destroyed. The oxide film formed on the surface of the high-hardness plating layer is destroyed along with the destruction of the high-hardness plating layer, and the new surface of the plating layer is exposed.

これにより、めっき層表面に形成される酸化皮膜を破壊させて凝着面積を稼ぐため、圧着部による導体部の圧縮率を過度に低くさせる必要がない。   Thereby, since the oxide film formed on the plating layer surface is destroyed to increase the adhesion area, it is not necessary to excessively reduce the compressibility of the conductor portion by the crimping portion.

従って、このようなアルミ電線用圧着端子では、凝着面積を稼ぐための過度な加工をする必要がなく、高い圧縮率の領域でも安定した接続信頼性を得ることができる。   Therefore, in such a crimp terminal for an aluminum electric wire, it is not necessary to perform excessive processing for increasing the adhesion area, and stable connection reliability can be obtained even in a high compression ratio region.

請求項２のアルミ電線用圧着端子は、めっき層が比較的硬度の低い錫系金属であっても、高い圧縮率の領域で確実に酸化皮膜を破壊させることができる。   The crimp terminal for an aluminum electric wire according to claim 2 can reliably break the oxide film in a high compressibility region even if the plating layer is a tin-based metal having a relatively low hardness.

請求項３のアルミ電線用圧着端子は、高硬度めっき層がめっき層の厚さよりも薄いので、破壊された後でも高硬度めっき層がアルミ電線と端子との接触抵抗になる影響を抑制することができる。   In the crimp terminal for aluminum wire according to claim 3, since the high-hardness plating layer is thinner than the thickness of the plating layer, the influence of the high-hardness plating layer becoming the contact resistance between the aluminum electric wire and the terminal is suppressed even after being destroyed. Can do.

図１〜図６を用いて本発明の実施の形態に係るアルミ電線用圧着端子について説明する。   A crimp terminal for an aluminum wire according to an embodiment of the present invention will be described with reference to FIGS.

本実施の形態のアルミ電線用圧着端子１は、アルミニウム系金属の複数の素線３からなる導体部５を有するアルミ電線７の導体部５に圧着され、銅系金属からなる圧着部９と、この圧着部９の導体部５と接触する接触面に設けられ、導体部５に対して凝着作用を有するめっき層１１と、このめっき層１１の表面に設けられ、めっき層１１よりも硬度が高い高硬度めっき層１３とを有する。   A crimp terminal 1 for an aluminum electric wire of the present embodiment is crimped to a conductor part 5 of an aluminum electric wire 7 having a conductor part 5 made of a plurality of strands 3 of an aluminum metal, and a crimp part 9 made of a copper metal, Provided on the contact surface of the crimping part 9 that contacts the conductor part 5, and has a plating layer 11 that has an adhesive action on the conductor part 5, and is provided on the surface of the plating layer 11. And a high hardness plating layer 13.

また、めっき層１１は、錫系金属からなる。   The plating layer 11 is made of a tin-based metal.

さらに、高硬度めっき層１３は、めっき層１１の厚さよりも薄い。   Further, the high hardness plating layer 13 is thinner than the thickness of the plating layer 11.

図１〜図６に示すように、アルミ電線７は、アルミニウム又はアルミニウム合金などのアルミニウム系金属からなる複数の素線３が撚られた導体部５と、この導体部５を被覆する絶縁被覆１５とを備えている。このアルミ電線７は、絶縁被覆１５が所定長さ剥がされ、露出した導体部５に対してアルミ電線用圧着端子１が圧着される。   As shown in FIGS. 1 to 6, the aluminum electric wire 7 includes a conductor portion 5 in which a plurality of strands 3 made of aluminum metal such as aluminum or an aluminum alloy are twisted, and an insulating coating 15 that covers the conductor portion 5. And. The aluminum wire 7 has the insulation coating 15 peeled off for a predetermined length, and the aluminum wire crimping terminal 1 is crimped to the exposed conductor portion 5.

アルミ電線用圧着端子１は、銅又は銅合金などの銅系金属からなり、電気接続部１７と、圧着部９とを備えている。電気接続部１７は、ボルト（不図示）などの固定手段が貫通可能な孔１９が形成され、固定手段によって固定されることにより、相手側の接続部材（不図示）と導通される。圧着部９は、電気接続部１７と底板２１を介して連続する一部材で形成され、一対の圧着片２３，２３と、一対の加締め片２５，２５とを備えている。   The crimp terminal 1 for an aluminum wire is made of a copper-based metal such as copper or a copper alloy, and includes an electrical connection portion 17 and a crimp portion 9. The electrical connection portion 17 is formed with a hole 19 through which a fixing means such as a bolt (not shown) can pass, and is electrically connected to a mating connection member (not shown) by being fixed by the fixing means. The crimping portion 9 is formed of a single member that is continuous through the electrical connection portion 17 and the bottom plate 21, and includes a pair of crimping pieces 23 and 23 and a pair of crimping pieces 25 and 25.

一対の圧着片２３，２３は、電気接続部１７側で底板２１の両側部に底板２１と一体に立設されている。この一対の圧着片２３，２３は、アルミ電線７の導体部５の外周側を包囲するように加締められ、アルミ電線７とアルミ電線用圧着端子１とを導通接触させる。一対の加締め片２５，２５は、アルミ電線７側で底板２１の両側部に底板２１と一体に立設されている。この一対の加締め片２５，２５は、アルミ電線７の絶縁被覆１５の外周側を包囲するように加締められ、アルミ電線７とアルミ電線用圧着端子１とを固定する。   The pair of crimping pieces 23, 23 are erected integrally with the bottom plate 21 on both sides of the bottom plate 21 on the electrical connection portion 17 side. The pair of crimping pieces 23, 23 are crimped so as to surround the outer peripheral side of the conductor portion 5 of the aluminum electric wire 7, thereby bringing the aluminum electric wire 7 and the aluminum electric wire crimping terminal 1 into conductive contact. The pair of caulking pieces 25, 25 are erected integrally with the bottom plate 21 on both sides of the bottom plate 21 on the aluminum electric wire 7 side. The pair of crimping pieces 25, 25 are crimped so as to surround the outer peripheral side of the insulating coating 15 of the aluminum wire 7, and fix the aluminum wire 7 and the crimp terminal 1 for the aluminum wire.

このような圧着部９でアルミ電線７を加締める（圧着する）ことにより、アルミ電線７が伸びて導体部５の表面に形成された酸化皮膜が破壊され、新生面が露出される。この新生面が導体部５と圧着部９との凝着面となる。この凝着面となる圧着部９の導体部５との接触面にはめっき層１１が形成されている。   By crimping (crimping) the aluminum electric wire 7 with such a crimping part 9, the aluminum electric wire 7 extends and the oxide film formed on the surface of the conductor part 5 is destroyed, and the new surface is exposed. This new surface becomes an adhesion surface between the conductor portion 5 and the crimping portion 9. A plating layer 11 is formed on the contact surface of the pressure-bonding portion 9 that becomes the adhesion surface with the conductor portion 5.

めっき層１１は、錫又は錫合金などの錫系金属からなり、底板２１の内面及び一対の圧着片２３，２３の内面にめっきされている。また、本実施の形態においては、めっき層１１の厚さは、例えば1.0μmで形成されることが好ましい。このめっき層１１は比較的硬度が低く、表面に酸化皮膜が形成された場合、圧着部９の圧着によるめっき層１１の変形に追従して酸化皮膜が伸びてしまい、酸化皮膜の破壊が不十分となり、めっき層１１の新生面露出面積が不十分となる可能性がある。このため、酸化皮膜の破壊を促進するためにめっき層１１の表面には、高硬度めっき層１３が設けられている。   The plating layer 11 is made of a tin-based metal such as tin or a tin alloy, and is plated on the inner surface of the bottom plate 21 and the inner surfaces of the pair of crimping pieces 23 and 23. Moreover, in this Embodiment, it is preferable that the thickness of the plating layer 11 is formed with 1.0 micrometer, for example. The plating layer 11 has a relatively low hardness, and when an oxide film is formed on the surface, the oxide film extends following the deformation of the plating layer 11 due to the crimping of the crimping part 9, and the oxide film is not sufficiently broken. Thus, there is a possibility that the exposed surface area of the plating layer 11 is insufficient. Therefore, a high hardness plating layer 13 is provided on the surface of the plating layer 11 in order to promote the destruction of the oxide film.

高硬度めっき層１３は、錫系金属からなるめっき層１１よりも硬度が高いタングステン（Ｗ）、アルミニウム（Ａｌ）、ニッケル（Ｎｉ）、亜鉛（Ｚｎ）、クロム（Ｃｒ）、モリブデン（Ｍｏ）、コバルト（Ｃｏ）などを蒸着、スパッタリングなどにより、めっき層１１の表面に設けられている。また、本実施の形態においては、高硬度めっき層１３の厚さは、例えば数十nm程度に形成されることが好ましい。この高硬度めっき層１３は、圧着部９の圧着によるめっき層１１の変形に追従することがなく、圧着部９の変形によって破壊される。従って、高硬度めっき層１３の表面に形成された酸化皮膜は、高硬度めっき層１３の破壊と共に破壊され、めっき層１１の新生面２７を露出することができる。なお、高硬度めっき層１３は、厚さが非常に薄く、破壊後の接触抵抗への影響が抑制されているため、導電性の金属に限らず、例えばシリコン、ＤＬＣ（ダイヤモンドライクカーボン）などの絶縁体であってもよい。   The high-hardness plating layer 13 is tungsten (W), aluminum (Al), nickel (Ni), zinc (Zn), chromium (Cr), molybdenum (Mo), whose hardness is higher than the plating layer 11 made of a tin-based metal, Cobalt (Co) or the like is provided on the surface of the plating layer 11 by vapor deposition, sputtering, or the like. In the present embodiment, the thickness of the high-hardness plating layer 13 is preferably formed to be, for example, about several tens of nm. The high-hardness plating layer 13 does not follow the deformation of the plating layer 11 due to the pressure bonding of the pressure bonding portion 9 and is destroyed by the deformation of the pressure bonding portion 9. Therefore, the oxide film formed on the surface of the high-hardness plating layer 13 is destroyed together with the destruction of the high-hardness plating layer 13, and the new surface 27 of the plating layer 11 can be exposed. The high-hardness plating layer 13 has a very small thickness, and the influence on the contact resistance after destruction is suppressed. Therefore, the high-hardness plating layer 13 is not limited to a conductive metal, but may be silicon, DLC (diamond-like carbon), or the like. An insulator may be used.

このようなアルミ電線用圧着端子１では、めっき層１１よりも硬度が高い高硬度めっき層１３がめっき層１１の表面に設けられているので、圧着部９でアルミ電線７の導体部５を圧着する際に高硬度めっき層１３が破壊され易くなっている。そして、高硬度めっき層１３の表面に形成された酸化皮膜が高硬度めっき層１３の破壊と共に破壊され、めっき層１１の新生面２７が露出される。   In such a crimp terminal 1 for an aluminum wire, a high-hardness plating layer 13 having a higher hardness than the plating layer 11 is provided on the surface of the plating layer 11, so that the conductor portion 5 of the aluminum wire 7 is crimped by the crimp portion 9. In doing so, the high-hardness plating layer 13 is easily broken. Then, the oxide film formed on the surface of the high-hardness plating layer 13 is destroyed along with the destruction of the high-hardness plating layer 13, and the new surface 27 of the plating layer 11 is exposed.

これにより、めっき層１１表面に形成される酸化皮膜を破壊させて凝着面積を稼ぐため、圧着部９による導体部５の圧縮率を過度に低くさせる必要がない。   Thereby, since the oxide film formed on the surface of the plating layer 11 is destroyed to increase the adhesion area, it is not necessary to excessively reduce the compressibility of the conductor portion 5 by the crimping portion 9.

従って、このようなアルミ電線用圧着端子１では、凝着面積を稼ぐための過度な加工をする必要がなく、高い圧縮率の領域でも安定した接続信頼性を得ることができる。   Therefore, in such a crimp terminal 1 for an aluminum electric wire, it is not necessary to perform excessive processing for increasing the adhesion area, and stable connection reliability can be obtained even in a high compression ratio region.

また、めっき層１１が比較的硬度の低い錫系金属であっても、高い圧縮率の領域で確実に酸化皮膜を破壊させることができる。   Moreover, even if the plating layer 11 is a tin-based metal having a relatively low hardness, the oxide film can be reliably destroyed in a region with a high compressibility.

さらに、高硬度めっき層１３がめっき層１１の厚さよりも薄いので、破壊された後でも高硬度めっき層１３がアルミ電線７とアルミ電線用圧着端子１との接触抵抗になる影響を抑制することができる。   Furthermore, since the high-hardness plating layer 13 is thinner than the thickness of the plating layer 11, the influence of the high-hardness plating layer 13 on the contact resistance between the aluminum wire 7 and the aluminum wire crimping terminal 1 is suppressed even after being destroyed. Can do.

なお、本発明の実施の形態に係るアルミ電線用圧着端子では、圧着部の導体部と接触する接触面にセレーションが設けられていないが、必要であればセレーションを設けてもよい。   In addition, in the crimp terminal for aluminum wires according to the embodiment of the present invention, serration is not provided on the contact surface that contacts the conductor part of the crimp part, but serration may be provided if necessary.

また、めっき層の表面に設けられる層を高硬度めっき層としているが、これに限らず、圧着前ではめっき層の新生面を保護し、圧着後にはめっき層の新生面を露出できる層であればどのような構成としてもよい。   Moreover, although the layer provided on the surface of the plating layer is a high-hardness plating layer, this is not limiting, and any layer can be used as long as it protects the new surface of the plating layer before crimping and exposes the new surface of the plating layer after crimping. It is good also as such a structure.

本発明の実施の形態に係るアルミ電線用圧着端子をアルミ電線に圧着させたときの側面図である。It is a side view when crimping | bonding the crimp terminal for aluminum wires which concerns on embodiment of this invention to the aluminum wire. 本発明の実施の形態に係るアルミ電線用圧着端子の平面図である。It is a top view of the crimp terminal for aluminum electric wires concerning an embodiment of the invention. 図１のＸ−Ｘ断面図である。It is XX sectional drawing of FIG. 本発明の実施の形態に係るアルミ電線用圧着端子の要部断面図である。It is principal part sectional drawing of the crimp terminal for aluminum electric wires which concerns on embodiment of this invention. 本発明の実施の形態に係るアルミ電線用圧着端子の圧着時の要部断面図である。It is principal part sectional drawing at the time of the crimping | compression-bonding of the crimp terminal for aluminum electric wires which concerns on embodiment of this invention. 本発明の実施の形態に係るアルミ電線用圧着端子をアルミ電線に対して圧着した時の要部断面図である。It is principal part sectional drawing when the crimp terminal for aluminum electric wires which concerns on embodiment of this invention is crimped | bonded with respect to the aluminum electric wire.

符号の説明Explanation of symbols

１…アルミ電線用圧着端子
３…素線
５…導体部
７…アルミ電線
９…圧着部
１１…めっき層
１３…高硬度めっき層 DESCRIPTION OF SYMBOLS 1 ... Crimp terminal for aluminum electric wires 3 ... Elementary wire 5 ... Conductor part 7 ... Aluminum electric wire 9 ... Crimp part 11 ... Plating layer 13 ... High hardness plating layer

Claims (3)

アルミニウム系金属の複数の素線からなる導体部を有するアルミ電線の前記導体部に圧着され、銅系金属からなる圧着部と、
この圧着部の前記導体部と接触する接触面に設けられ、前記導体部に対して凝着作用を有するめっき層と、
このめっき層の表面に設けられ、前記めっき層よりも硬度が高い高硬度めっき層と、
を有することを特徴とするアルミ電線用圧着端子。 Crimped to the conductor part of the aluminum electric wire having a conductor part made of a plurality of strands of aluminum-based metal, and a crimped part made of copper-based metal;
A plating layer that is provided on a contact surface of the pressure-bonding portion that comes into contact with the conductor portion, and has an adhesion action on the conductor portion;
Provided on the surface of this plating layer, a high hardness plating layer having a higher hardness than the plating layer,
A crimp terminal for an aluminum electric wire characterized by comprising: 前記めっき層は、錫系金属からなることを特徴とする請求項１記載のアルミ電線用圧着端子。   2. The crimp terminal for an aluminum electric wire according to claim 1, wherein the plating layer is made of a tin-based metal. 前記高硬度めっき層は、前記めっき層の厚さよりも薄いことを特徴とする請求項１又は２記載のアルミ電線用圧着端子。   The crimp terminal for an aluminum electric wire according to claim 1 or 2, wherein the high-hardness plating layer is thinner than the thickness of the plating layer.
JP2008134083A 2008-05-22 2008-05-22 Crimp terminal for aluminum wire Active JP5065993B2 (en)

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PCT/JP2009/059384 WO2009142278A1 (en) 2008-05-22 2009-05-21 Aluminum cable crimp terminal

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