JP3895466B2 - IDC type connector - Google Patents

Description

【０００９】
複数の素線のどれも少なくとも一方のフォーク板に接触し、導体と圧接形コネクタとの接触抵抗が減少する。
【００１０】
また、フォーク板のスロット部に電線を第１傾斜部でガイドしながら押し込んで、エッジ部で絶縁被覆を剥がし、第２傾斜部で導体の素線を圧縮及び再配列させ、面取り部でエッジ部の被覆剥離の効果を高め、刃部を導体に押し付けて圧接保持することで、導体と圧接形コネクタとを接触させることができる。
【００１１】
【発明の実施の形態】
本発明の実施の形態を添付図に基づいて以下に説明する。なお、図面は符号の向きに見るものとする。
図１は本発明に係る圧接形コネクタの斜視図であり、圧接形コネクタ１は、板材で一体的に形成したのもであり、電線Ｃ１に導通させるためにフォーク状に形成したフォーク板としての第１・第２圧接部２，３と、電線Ｃ２に導通させるためにフォーク状に形成したフォーク板としての第３・第４圧接部４，５と、これら第１圧接部２、第２圧接部３、第３圧接部４及び第４圧接部５を繋ぐ基部６とからなる。なお、電線Ｃ１は、複数の素線（図示せず）を撚り合せた導体Ｄ１と、この導体Ｄ１を包む絶縁被覆Ｅ１とからなる。
また、電線Ｃ２は、複数の素線（図示せず）を撚り合せた導体Ｄ２と、この導体Ｄ２を包む絶縁被覆Ｅ２とからなる。
【００１２】
第１・第２圧接部２，３と第３・第４圧接部４，５とは、直交して重なる電線Ｃ１と電線Ｃ２との結線を行うために、高さが異なるものである。
第１圧接部２、第２圧接部３は、電線Ｃ１を押し込むためのスロット部７，８を備える。
第３圧接部４及び第４圧接部５は、電線Ｃ２を押し込むためのスロット部１１，１２を備える。
【００１３】
第１圧接部２と第２圧接部３とは、平行であり、それらの間隔、ここでは、第１・第２圧接部２，３のそれぞれの内面２ａ，３ａ間の距離をｔとする。
また、第３圧接部４と第４圧接部５とは、同じく平行であり、それらの間隔、ここでは、第３・第４圧接部４，５のそれぞれの内面４ａ，５ａ間の距離をｔ（図示せず）とする。
また、電線Ｃ１，Ｃ２の導体Ｄ１，Ｄ２の外径、即ち、導体Ｄ１，Ｄ２の外接円の直径をｄ（導体Ｄ２には図示せず）とする。
【００１４】
図２は図１の２矢視図でり、第１圧接部２のスロット部７は、開口側から順に、電線Ｃ１をガイドするための第１傾斜部７ａ，７ａと、絶縁被覆Ｅ１を剥がすためのエッジ部７ｂ，７ｂと、導体Ｄ１の素線を圧縮及び再配列させる第２傾斜部７ｃ，７ｃと、エッジ部７ｂ，７ｂの被覆剥離の効果を高めるために第１傾斜部７ａ，７ａ及び第２傾斜部７ｃ，７ｃの外側面に形成した面取り部７ｄ，７ｄと、導体Ｄ１に押し付けて圧接保持するための左・右刃部７Ｌ，７Ｒと、スロット部７に電線Ｃ１を押し込んだときに応力の集中を防ぐアール部７ｆとからなる。
【００１５】
スロット部８は、スロット部７と同一形状であり、説明を省略する。
なお、８Ｌ，８Ｒは導体Ｄ１に押し付けて圧接保持するための左・右刃部である。
左・右刃部７Ｌ，７Ｒ及び左・右刃部８Ｌ，８Ｒの間隔をＷＳ（左・右刃部８Ｌ，８Ｒには図示せず）とする。
【００１６】
図３は本発明に係る第１・第２圧接部と導体との接触状態を説明する説明図であり、（ａ）は側面図（絶縁被覆は図示せず）、（ｂ）は（ａ）のｂ−ｂ線断面図、（ｃ）は（ａ）のｃ−ｃ線断面図である。
（ａ）において、第１・第２圧接部２，３は、スロット部７，８（図１参照）で撚り線である導体Ｄ１を圧接する。
【００１７】
導体Ｄ１は、例えば、各素線を第１圧接部２から第２圧接部３にかけて反時計回りに撚ったものである。
ここで、１本の素線（ハッチングを施した線）をＦとすると、第１圧接部２付近では素線Ｆは導体Ｄ１のほぼ上部にあり、導体Ｄ１の奥側（破線部分）を通って、第２圧接部３付近では導体Ｄ１の手前側に至る。
【００１８】
（ｂ）において、第１圧接部２側では、素線Ｆは、左・右刃部７Ｌ，７Ｒとのどちらにも接触しない。
（ｃ）において、第２圧接部３側では、素線Ｆは、右刃部８Ｒと接触する。
即ち、素線Ｆは、第１圧接部２と第２圧接部３との間隔ｔ（図３（ａ）参照）を後述する範囲に設定することにより、第１・第２圧接部２，３のどちらか一方に接触する。他の素線についても、同様である。
【００１９】
以上に述べた第１・第２圧接部２，３の間隔ｔの設定方法を次に説明する。
図４は本発明に係る第１・第２圧接部の間隔の設定方法を説明する説明図であり、電線Ｃ１（図１参照）の導体Ｄ１を第１圧接部２の刃部７Ｌ，７Ｒ間及び第２圧接部３の刃部８Ｌ，８Ｒ間に押し込んだ状態を示す。ここで、図の下方の第１・第２圧接部２，３の断面図は、それぞれ図３の（ｂ），（ｃ）に相当する。なお、第３・第４圧接部４，５の間隔の設定方法については第１圧接部２，３の方法と同様なので説明を省略する。
外径ｄの導体Ｄ１を間隔ＷＳの左・右刃部７Ｌ，７Ｒ間（及び刃部８Ｌ，８Ｒ間）に押込んだ場合、導体Ｄ１は圧縮により変形し、上下に長い略長円形状になる。
【００２０】
この時、第１圧接部２の右刃部７Ｒの上部に最接近させた（接触していない）位置の素線をＰ、この素線Ｐから反時計回りの側にあり、且つ左刃部７Ｌの上部に最接近させた（接触していない）位置の素線をＱとする。
また、第２圧接部３の刃部８Ｌ，８Ｒでの素線Ｐの位置をそれぞれ位置Ｒ，Ｓ，Ｔ，Ｕ，Ｖ，Ｗとする。
更にまた、第２圧接部３の刃部８Ｌ，８Ｒでの素線Ｑの位置もそれぞれ位置Ｒ，Ｓ，Ｔ，Ｕ，Ｖ，Ｗをとり得る。
【００２１】
位置Ｒ，Ｔ，Ｕ，Ｗは、素線Ｐ，Ｑが左・右刃部８Ｌ，８Ｒに接触する上下端の位置であり、左・右刃部８Ｌ，８Ｒ（又は左・右刃部７Ｌ，７Ｒ）の中心線をＣＶ、導体Ｄ１の上下方向の中心線をＣＨ、中心線ＣＶと中心線ＣＨとの交点を点Ｇとすると、位置Ｒと位置Ｕとは点Ｇに対して点対称であり、位置Ｔと位置Ｗとは点Ｇに対して点対称である。位置Ｓ，Ｖについては後述する。
【００２２】
更に、位置Ｒの中心を点ＲC、位置Ｔの中心を点ＴC、位置Ｕの中心を点ＵC、位置Ｗの中心を点ＷCとし、中心線ＣＶと直線ＷCＴCとのなす角をθとすると、∠ＷCＧＲC＝２θとなる。
更にまた、導体Ｄ１の撚り方向をｔｗとする。
【００２３】
以下に、素線Ｐ，Ｑが第２圧接部３の左・右刃部８Ｌ，８Ｒのどちらか一方に接触する条件を求める。
素線Ｐが左刃部８Ｌの位置Ｒから位置Ｔまでの間に接触すると仮定すると、素線Ｑは、素線Ｐが位置Ｔにあるときに、位置Ｔと位置Ｕとの間に位置することになり、左・右刃部８Ｌ，８Ｒのどちらにも接触しなくなる。
【００２４】
従って、素線Ｐ，Ｑの両方が刃部８Ｌに接触するためには、素線Ｐは、位置Ｓを位置Ｔから２θだけ時計回りの位置とすれば、位置Ｒから位置Ｓの間にあればよい。即ち、素線Ｐが範囲Ｘで接触すればよい。
これより、上記した素線Ｐ，Ｑが左刃部８Ｌに接触する条件は、導体Ｄ１の第１圧接部２から第２圧接部３に至る撚り角度をφ_１とすると、
２θ≦φ_１＜π−２θ……（１）
【００２５】
また、素線Ｐ，Ｑの両方が刃部８Ｒに接触するためには、上記と同様にして、素線Ｐは、位置Ｖを位置Ｗから２θだけ時計回りの位置とすれば、位置Ｕから位置Ｖの間にあればよい。即ち、素線Ｐが範囲Ｙで接触すればよい。
従って、上記した素線Ｐ，Ｑが右刃部８Ｒに接触する条件は、導体Ｄ１の第１圧接部２から第２圧接部３に至る撚り角度をφ_２とすると、
π＋２θ≦φ_２＜２π−２θ……（２）
【００２６】
ここで、導体Ｄ１の素線が１回転撚られるときの導体Ｄ１長さ方向のピッチを撚りピッチｐとすると、第１・第２圧接部２，３間の間隔ｔ、撚り角度φ_１，φ_２、撚りピッチｐの関係は、
ｔ：ｐ＝φ_１：２π、又はｔ：ｐ＝φ_２：２π
従って、
ｔ＝φ_１／２π・ｐ……（３）
又は、
ｔ＝φ_２／２π・ｐ……（４）
【００２７】
（１）式及び（３）式より、
２θ／２π・ｐ≦ｔ＜（π−２θ）／２π・ｐ
従って、
θ／π・ｐ≦ｔ＜（０．５−θ／π）・ｐ……（５）
また、（２）式及び（４）式より、
（π＋２θ）／２π・ｐ≦ｔ＜（２π−２θ）／２π・ｐ
従って、
（０．５＋θ／π）・ｐ≦ｔ＜（１−θ／π）・ｐ……（６）
【００２８】
ここで、直線ＷCＴCの長さをｋ・ｄ（導体Ｄ１が押し潰されたときに、最も外側に並んだ素線Ｐ（又は素線Ｑ）の位置Ｗから位置Ｔまでの距離が導体Ｄ１の外径ｄのｋ倍になったとする。ｋは定数である。）、素線Ｐの径をＳｄとすると、
ｓｉｎθ＝（ＷＳ−Ｓｄ）／（ｋ・ｄ）
従って、
θ＝ｓｉｎ^−１（（ＷＳ−Ｓｄ）／（ｋ・ｄ））……（７）
【００２９】
ここで、
Ｍ＝θ／π
とすると、（５）式は、
Ｍ・ｐ≦ｔ＜（０．５−Ｍ）・ｐ……（８）
また、（６）式は、
（０．５＋Ｍ）・ｐ≦ｔ＜（１−Ｍ）・ｐ……（９）
上記した（８）式又は（９）式が、導体Ｄ１の複数の素線Ｐ，Ｑ（及び残りの素線）を第１・第２圧接部２，３のどちらか一方に接触するための条件である。
【００３０】
図５は本発明に係る圧接形コネクタのＷＳ／ｄと素線切れ本数との関係を示すグラフであり、縦軸は導体の素線切れ本数、横軸は導体径に対する刃部間隔の比率であるＷＳ／ｄを表す。（符号は図１及び図４参照。）
ＷＳ／ｄが小さい、即ち導体Ｄ１（又は導体Ｄ２）の外径ｄに対して左・右刃部７Ｌ，７Ｒ（又は左・右刃部８Ｌ，８Ｒ）間の間隔ＷＳが小さいと、導体Ｄ１（又は導体Ｄ２）を左・右刃部７Ｌ，７Ｒ（又は左・右刃部８Ｌ，８Ｒ）間に無理に押し込むことになり、素線切れ本数が多くなる。
【００３１】
ＷＳ／ｄを大きくする、即ち導体Ｄ１（又は導体Ｄ２）の外径ｄに対して左・右刃部７Ｌ，７Ｒ（又は左・右刃部８Ｌ，８Ｒ）間の間隔ＷＳを大きくするにつれて導体Ｄ１が左・右刃部７Ｌ，７Ｒ（又は左・右刃部８Ｌ，８Ｒ）間に比較的容易に入り込むようになって、素線切れ本数が少なくなり、ＷＳ／ｄの値が０．４以上では、素線切れはなくなる。
【００３２】
図６は本発明に係る圧接形コネクタのＷＳ／ｄと接触抵抗との関係を示すグラフであり、縦軸は圧接コネクタと導体との接触抵抗、横軸はＷＳ／ｄを表す。（符号は図１及び図４参照。）
ＷＳ／ｄが小さいと、左・右刃部７Ｌ，７Ｒ（又は左・右刃部８Ｌ，８Ｒ）が導体Ｄ１の各素線を強く押さえるため接触抵抗は小さく安定するが、ＷＳ／ｄが０．６以上になると、左・右刃部７Ｌ，７Ｒ（又は左・右刃部８Ｌ，８Ｒ）が導体Ｄ１の各素線を押さえる力が弱くなるため、急激に接触抵抗が大きくなる。
【００３３】
以上の結果より、素線切れが発生せず、しかも接触抵抗が小さくなる条件として、ＷＳ／ｄを、
０．４≦ＷＳ／ｄ≦０．６
に設定すればよい。
【００３４】
尚、本発明の実施の形態では、圧接形コネクタによって、２本の電線を結線する場合を示したが、これに限るものではなく、圧接形コネクタを１本の電線の端子として接続する場合に用いてもよい。
【００３５】
【発明の効果】
本発明は上記構成により次の効果を発揮する。
請求項１の圧接形コネクタは、圧接形コネクタのフォーク板を互いに平行で且つ間隔ｔを次に示す（１）式又は（２）式のように設定し、導体の外径に対する刃部の間隔の比率ＷＳ／ｄを次に示す（３）式のように設定し、フォーク板に、電線を押し込むためのスロット部を備え、このスロット部に、開口側から順に、電線をガイドするための第１傾斜部と、絶縁被覆を剥がすためのエッジ部と、導体の素線を圧縮及び再配列させる第２傾斜部と、エッジ部の被覆剥離の効果を高めるために第１傾斜部及び第２傾斜部の側面に形成された面取り部と、導体に押し付けて圧接保持するための刃部とを備えた。
【００３６】
【数３】

【００３７】
複数の素線のどれも少なくとも一方のフォーク板に接触させることで、導体と圧接形コネクタとの接触抵抗を減少させることができる。
また、フォーク板のスロット部に電線を第１傾斜部でガイドしながら押し込んで、エッジ部で絶縁被覆を剥がし、第２傾斜部で導体の素線を圧縮及び再配列させ、面取り部でエッジ部の被覆剥離の効果を高め、刃部を導体に押し付けて圧接保持することで、導体と圧接形コネクタとを接触させることができる。
【図面の簡単な説明】
【図１】 本発明に係る圧接形コネクタの斜視図
【図２】 図１−２矢視図
【図３】 本発明に係る第１・第２圧接部と導体との接触状態を説明する説明図
【図４】 本発明に係る第１・第２圧接部の間隔の設定方法を説明する説明図
【図５】 本発明に係る圧接形コネクタのＷＳ／ｄと素線切れ本数との関係を示すグラフ
【図６】 本発明に係る圧接形コネクタのＷＳ／ｄと接触抵抗との関係を示すグラフ
【図７】 従来の圧接形コネクタを示す斜視図
【図８】 金属爪要素に接続した被覆電線の芯線を示す図
【符号の説明】
１…圧接形コネクタ、２，３，４，５…フォーク板（第１圧接部、第２圧接部、第３圧接部、第４圧接部）、７，８，１１，１２…スロット部、７ａ…第１傾斜部、７ｂ…エッジ部、７ｃ…第２傾斜部、７ｄ…面取り部、７Ｌ，７Ｒ，８Ｌ，８Ｒ…刃部（左・右刃部）、Ｃ１，Ｃ２…電線、Ｄ１，Ｄ２…導体、ｄ…導体の外径、Ｅ１，Ｅ２…絶縁被覆、Ｆ，Ｐ，Ｑ…素線、ｋ…定数、Ｍ…θ／π、ｐ…導体の撚りピッチ、Ｒｄ…素線の径と導体の外径との比率、Ｓｄ…素線の径、ｔ…フォーク板の間隔、ＷＳ…刃部の間隔。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement of a pressure contact type connector.
[0002]
[Prior art]
For example, Japanese Utility Model Laid-Open No. 55-21553 “Electric Wire Connection Device” is known as a pressure contact type connector.
The above technique relates to a wire connecting device that can easily and efficiently electrically connect a covered electric wire to another covered electric wire at an intermediate portion, and FIG. And explain. The reference numerals are reassigned.
[0003]
FIG. 7 is a perspective view showing a conventional pressure contact type connector. A metal claw element 100 as a connector includes leg pieces 101 and 102 (leg pieces 102 are not shown) facing each other and leg pieces facing each other. Sections 103, 104, two forked ends 105, 105 provided at the ends of the leg pieces 101, 102, 103, 104, and a core wire holding section 106 provided in the forked ends 105, 105, respectively. Prepare. In addition, 107 and 108 are covered electric wires, and 109 and 110 are core wires composed of a plurality of strands.
[0004]
[Problems to be solved by the invention]
8A and 8B are views showing the core wire of the covered electric wire connected to the metal claw element, FIG. 8A shows the contact state between the leg piece portion 103 and the core wire 110, and FIG. 8B shows the leg piece. The connection state of the part 104 and the core wire 110 is shown.
In (a), the strand 111 which does not contact the leg piece part 103 exists among the strands of the core wire 110.
[0005]
In (b), when the core wire 110 is a stranded wire, the wire 111 does not contact the leg piece portion 104 at the leg piece portion 104 spaced apart from the leg piece portion 103 shown in (a). There is.
As described above, when neither of the leg pieces 103 and 104 is in contact with each other, the cross-sectional area of the core wire 110 for conduction is reduced, and the contact resistance between the metal claw element 100 (see FIG. 7) and the core wire 110 is reduced. There is an inconvenience of increasing.
[0006]
SUMMARY OF THE INVENTION An object of the present invention is to provide a pressure contact connector that can reduce the contact resistance.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, claim 1 of the present invention comprises an electric wire in which a conductor formed by twisting a plurality of strands is covered with an insulating coating, and two rows of blade portions having a narrower interval than the outer diameter of the conductor. Fork plate of pressure contact type connector, which presses a pair of opposing fork plates and cuts the insulation coating at the blade part and makes the conductor and the fork plate conductive by bringing the blade part into contact with the wire. Are parallel to each other and the interval t is set as shown in the following equation (1) or (2), and the ratio WS / d of the interval of the blade portion to the outer diameter of the conductor is expressed as shown in the following equation (3). The fork plate is provided with a slot portion for pushing the electric wire, and in this slot portion, in order from the opening side, a first inclined portion for guiding the electric wire, an edge portion for peeling off the insulation coating, Second inclined portion for compressing and rearranging the conductor wires , Comprising: a first inclined portion and a chamfered portion formed on the side surface of the second angled portion in order to enhance the effect of the coating peeling of the edge portion, and a blade portion for pressure contact against the conductor.
[0008]
[Expression 2]

[0009]
Any of the plurality of strands comes into contact with at least one of the fork plates, and the contact resistance between the conductor and the pressure contact connector is reduced.
[0010]
Also, the electric wire is pushed into the slot portion of the fork plate while being guided by the first inclined portion, the insulating coating is peeled off at the edge portion, the conductor wires are compressed and rearranged at the second inclined portion, and the edge portion is formed at the chamfered portion. The effect of peeling off the coating can be enhanced, and the conductor can be brought into contact with the pressure contact connector by pressing and holding the blade portion against the conductor.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.
FIG. 1 is a perspective view of a pressure contact type connector according to the present invention. The pressure contact type connector 1 is integrally formed of a plate material, and is a fork plate formed in a fork shape to be electrically connected to an electric wire C1. The first and second press contact portions 2 and 3, the third and fourth press contact portions 4 and 5 as fork plates formed in a fork shape for conducting to the electric wire C2, the first press contact portion 2 and the second press contact The base part 6 which connects the part 3, the 3rd press-contact part 4, and the 4th press-contact part 5 is comprised. The electric wire C1 includes a conductor D1 obtained by twisting a plurality of strands (not shown) and an insulating coating E1 that wraps the conductor D1.
The electric wire C2 includes a conductor D2 obtained by twisting a plurality of strands (not shown) and an insulating coating E2 that wraps the conductor D2.
[0012]
The first and second press contact portions 2 and 3 and the third and fourth press contact portions 4 and 5 are different in height in order to connect the electric wire C1 and the electric wire C2 that are orthogonally overlapped with each other.
The 1st press-contact part 2 and the 2nd press-contact part 3 are provided with the slot parts 7 and 8 for pushing in the electric wire C1.
The 3rd press-contact part 4 and the 4th press-contact part 5 are provided with the slot parts 11 and 12 for pushing in the electric wire C2.
[0013]
The first pressure contact portion 2 and the second pressure contact portion 3 are parallel, and the distance between them, here, the distance between the inner surfaces 2a and 3a of the first and second pressure contact portions 2 and 3 is t.
The third pressure contact portion 4 and the fourth pressure contact portion 5 are also parallel, and the distance between them, here, the distance between the inner surfaces 4a and 5a of the third and fourth pressure contact portions 4 and 5 is t. (Not shown).
Further, the outer diameter of the conductors D1 and D2 of the electric wires C1 and C2, that is, the diameter of the circumscribed circle of the conductors D1 and D2, is d (not shown in the conductor D2).
[0014]
2 is a view taken in the direction of the arrow 2 in FIG. 1, and the slot portion 7 of the first pressure contact portion 2 peels off the first inclined portions 7a and 7a for guiding the electric wire C1 and the insulating coating E1 in order from the opening side. Edge portions 7b and 7b, second inclined portions 7c and 7c for compressing and rearranging the strands of the conductor D1, and first inclined portions 7a and 7a for enhancing the effect of covering and peeling the edge portions 7b and 7b. And the chamfered portions 7d and 7d formed on the outer surfaces of the second inclined portions 7c and 7c, the left and right blade portions 7L and 7R for pressing and holding the conductor D1, and the electric wire C1 is pushed into the slot portion 7. It consists of a rounded portion 7f that sometimes prevents stress concentration.
[0015]
The slot portion 8 has the same shape as the slot portion 7 and will not be described.
Reference numerals 8L and 8R denote left and right blade portions for pressing and holding the conductor D1.
The interval between the left and right blade portions 7L and 7R and the left and right blade portions 8L and 8R is WS (not shown in the left and right blade portions 8L and 8R).
[0016]
FIGS. 3A and 3B are explanatory views for explaining a contact state between the first and second pressure contact portions and the conductor according to the present invention, wherein FIG. 3A is a side view (insulating coating is not shown), and FIG. FIG. 5B is a cross-sectional view taken along the line bb of FIG.
In (a), the first and second press contact portions 2 and 3 press-contact the conductor D1 which is a stranded wire at the slot portions 7 and 8 (see FIG. 1).
[0017]
For example, the conductor D1 is formed by twisting each strand from the first pressure contact portion 2 to the second pressure contact portion 3 in a counterclockwise direction.
Here, assuming that one strand (hatched wire) is F, the strand F is substantially above the conductor D1 in the vicinity of the first press-contact portion 2, and passes through the back side (dashed line portion) of the conductor D1. Thus, in the vicinity of the second press-contact portion 3, it reaches the near side of the conductor D1.
[0018]
In (b), on the first pressure contact portion 2 side, the wire F does not contact either the left / right blade portions 7L, 7R.
In (c), the strand F contacts the right blade portion 8R on the second press-contact portion 3 side.
That is, the wire F is set to the first and second press contact portions 2 and 3 by setting the interval t (see FIG. 3A) between the first press contact portion 2 and the second press contact portion 3 to a range described later. Touch either one of them. The same applies to other strands.
[0019]
Next, a method for setting the interval t between the first and second press contact portions 2 and 3 described above will be described.
FIG. 4 is an explanatory view for explaining the method for setting the distance between the first and second pressure contact parts according to the present invention, in which the conductor D1 of the electric wire C1 (see FIG. 1) is connected between the blade parts 7L and 7R of the first pressure contact part 2. And the state pushed in between the blade parts 8L and 8R of the 2nd press-contact part 3 is shown. Here, the cross-sectional views of the first and second press contact portions 2 and 3 at the bottom of the figure correspond to (b) and (c) of FIG. 3, respectively. The method for setting the distance between the third and fourth press contact portions 4 and 5 is the same as the method for the first press contact portions 2 and 3, and therefore the description thereof is omitted.
When the conductor D1 having the outer diameter d is pushed between the left and right blade portions 7L and 7R (and between the blade portions 8L and 8R) with the interval WS, the conductor D1 is deformed by compression and is formed into a substantially oval shape that is long vertically. Become.
[0020]
At this time, the strand at the position closest to (not in contact with) the upper portion of the right blade portion 7R of the first pressure contact portion 2 is P, the counterclockwise side from the strand P, and the left blade portion Let Q be the wire at the position closest to (not in contact with) the upper part of 7L.
Further, the positions of the strands P at the blade portions 8L and 8R of the second press-contact portion 3 are defined as positions R, S, T, U, V, and W, respectively.
Furthermore, the position of the wire Q at the blade portions 8L and 8R of the second press-contact portion 3 can also take positions R, S, T, U, V, and W, respectively.
[0021]
The positions R, T, U, and W are the positions of the upper and lower ends where the wires P and Q are in contact with the left and right blade portions 8L and 8R, and the left and right blade portions 8L and 8R (or the left and right blade portions 7L). , 7R) is CV, the vertical center line of the conductor D1 is CH, and the intersection of the center line CV and the center line CH is a point G. The position R and the position U are symmetrical with respect to the point G. The position T and the position W are point symmetric with respect to the point G. The positions S and V will be described later.
[0022]
Further, if the center of the position R is the point RC, the center of the position T is the point TC, the center of the position U is the point UC, the center of the position W is the point WC, and the angle between the center line CV and the straight line WCTC is θ. ∠WCGRC = 2θ.
Furthermore, the twist direction of the conductor D1 is tw.
[0023]
In the following, a condition in which the wires P and Q are in contact with one of the left and right blade portions 8L and 8R of the second press-contact portion 3 is obtained.
Assuming that the strand P contacts between the position R and the position T of the left blade portion 8L, the strand Q is located between the position T and the position U when the strand P is at the position T. That is, the left and right blade portions 8L and 8R do not come into contact with each other.
[0024]
Therefore, in order for both of the wires P and Q to contact the blade portion 8L, the wire P should be between the position R and the position S if the position S is set to a position clockwise by 2θ from the position T. That's fine. That is, it is sufficient that the element wire P is in contact with the range X.
From this, the wire P described above, the condition Q contacts the Hidariha portion 8L, when the twist angle reaches the first contact portion 2 of the conductors D1 to the second contact portion 3 and phi _1,
2θ ≦ φ ₁ <π-2θ (1)
[0025]
Also, in order for both of the strands P and Q to contact the blade portion 8R, in the same manner as described above, the strand P can be moved from the position U if the position V is set to a position clockwise by 2θ from the position W. It only has to be between the positions V. That is, it is only necessary that the wire P contacts in the range Y.
Therefore, wire P described above, the condition that Q is in contact with the right edge portion 8R, when the twist angle reaches the first pressing portion 2 to the second pressing part 3 of the conductor D1 and phi _2,
π + 2θ ≦ φ ₂ <2π−2θ (2)
[0026]
Here, assuming that the pitch in the length direction of the conductor D1 when the strand of the conductor D1 is twisted by one rotation is the twist pitch p, the interval t between the first and second press contact portions 2 and 3, the twist angles φ ₁ , φ ₂ , the relationship of the twist pitch p is
t: p = φ ₁ : 2π or t: p = φ ₂ : 2π
Therefore,
t = φ ₁ / 2π · p (3)
Or
t = φ ₂ / 2π · p (4)
[0027]
From equation (1) and equation (3),
2θ / 2π · p ≦ t <(π-2θ) / 2π · p
Therefore,
θ / π · p ≦ t <(0.5−θ / π) · p (5)
From the formulas (2) and (4),
(Π + 2θ) / 2π · p ≦ t <(2π-2θ) / 2π · p
Therefore,
(0.5 + θ / π) · p ≦ t <(1−θ / π) · p (6)
[0028]
Here, the length of the straight line WCTC is k · d (when the conductor D1 is crushed, the distance from the position W to the position T of the strand P (or strand Q) arranged on the outermost side is the length of the conductor D1. Suppose k is the outer diameter d, where k is a constant.) If the diameter of the wire P is Sd,
sin θ = (WS−Sd) / (k · d)
Therefore,
θ = sin ⁻¹ ((WS−Sd) / (k · d)) (7)
[0029]
here,
M = θ / π
Then, equation (5) becomes
M · p ≦ t <(0.5−M) · p (8)
Also, the equation (6) is
(0.5 + M) · p ≦ t <(1−M) · p (9)
The above-described equation (8) or equation (9) is used for bringing the plurality of strands P and Q (and the remaining strands) of the conductor D1 into contact with either one of the first and second press contact portions 2 and 3. It is a condition.
[0030]
FIG. 5 is a graph showing the relationship between WS / d and the number of broken wires of the pressure contact type connector according to the present invention, where the vertical axis represents the number of broken conductor wires, and the horizontal axis represents the ratio of the blade interval to the conductor diameter. It represents a certain WS / d. (Refer to FIG. 1 and FIG. 4 for symbols.)
When WS / d is small, that is, when the distance WS between the left and right blade portions 7L and 7R (or the left and right blade portions 8L and 8R) is small with respect to the outer diameter d of the conductor D1 (or conductor D2), the conductor D1. (Or the conductor D2) is forcibly pushed between the left and right blade portions 7L and 7R (or the left and right blade portions 8L and 8R), and the number of strands is increased.
[0031]
The conductor increases as WS / d is increased, that is, the distance WS between the left and right blade portions 7L and 7R (or the left and right blade portions 8L and 8R) is increased with respect to the outer diameter d of the conductor D1 (or conductor D2). D1 enters between the left and right blade portions 7L and 7R (or the left and right blade portions 8L and 8R) relatively easily, the number of strands is reduced, and the WS / d value is 0.4. With the above, the wire breakage is eliminated.
[0032]
FIG. 6 is a graph showing the relationship between WS / d and contact resistance of the pressure contact connector according to the present invention, where the vertical axis represents the contact resistance between the pressure contact connector and the conductor, and the horizontal axis represents WS / d. (Refer to FIG. 1 and FIG. 4 for symbols.)
When WS / d is small, the left and right blade portions 7L and 7R (or the left and right blade portions 8L and 8R) strongly hold the strands of the conductor D1, and the contact resistance is small and stable, but WS / d is 0. If it is .6 or more, the force with which the left and right blade portions 7L and 7R (or the left and right blade portions 8L and 8R) hold down each element wire of the conductor D1 becomes weak, so that the contact resistance rapidly increases.
[0033]
From the above results, WS / d is determined as a condition that the wire breakage does not occur and the contact resistance is reduced.
0.4 ≦ WS / d ≦ 0.6
Should be set.
[0034]
In the embodiment of the present invention, the case where two electric wires are connected by a pressure contact type connector has been shown. However, the present invention is not limited to this, and when the pressure contact type connector is connected as a terminal of one electric wire. It may be used.
[0035]
【The invention's effect】
The present invention exhibits the following effects by the above configuration.
The pressure contact type connector according to claim 1 is configured such that the fork plates of the pressure contact type connector are parallel to each other and the interval t is set as shown in the following equation (1) or (2), and the interval of the blade portion relative to the outer diameter of the conductor The ratio WS / d is set as shown in the following equation (3) , and the fork plate is provided with a slot portion for pushing the electric wire, and the slot portion is sequentially provided from the opening side for guiding the electric wire. 1 inclined portion, an edge portion for stripping the insulation coating, a second inclined portion for compressing and rearranging the conductor wires, and a first inclined portion and a second inclined portion for enhancing the effect of covering peeling of the edge portion A chamfered portion formed on a side surface of the portion and a blade portion for pressing and holding the conductor against the conductor .
[0036]
[Equation 3]

[0037]
The contact resistance between the conductor and the pressure contact connector can be reduced by bringing any of the plurality of strands into contact with at least one of the fork plates.
Also, the electric wire is pushed into the slot portion of the fork plate while being guided by the first inclined portion, the insulating coating is peeled off at the edge portion, the conductor wires are compressed and rearranged at the second inclined portion, and the edge portion is formed at the chamfered portion. The effect of peeling off the coating can be enhanced, and the conductor can be brought into contact with the pressure contact connector by pressing and holding the blade portion against the conductor.
[Brief description of the drawings]
FIG. 1 is a perspective view of a pressure contact connector according to the present invention. FIG. 2 is a view as viewed from an arrow of FIG. 1-2. FIG. 3 is an explanatory diagram for explaining a contact state between first and second pressure contact portions according to the present invention FIG. 4 is an explanatory view for explaining a method of setting the distance between the first and second pressure contact parts according to the present invention. FIG. 5 shows the relationship between WS / d and the number of broken wires of the pressure contact type connector according to the present invention. Fig. 6 is a graph showing the relationship between WS / d and contact resistance of a pressure contact connector according to the present invention. Fig. 7 is a perspective view showing a conventional pressure contact connector. Fig. 8 is a coating connected to a metal claw element. Diagram showing core wire of wire [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Press-contact type connector, 2, 3, 4, 5 ... Fork board (1st press-contact part, 2nd press-contact part, 3rd press-contact part, 4th press-contact part) 7, 8 , 11 , 12 ... Slot part, 7a ... 1st inclined part, 7b ... Edge part, 7c ... 2nd inclined part, 7d ... Chamfered part, 7L, 7R, 8L, 8R ... Blade part (left / right blade part), C1, C2 ... Electric wire, D1, D2 ... conductor, d ... conductor outer diameter, E1, E2 ... insulation coating, F, P, Q ... elementary wire, k ... constant, M ... θ / π, p ... conductor twist pitch, Rd ... elementary wire diameter Ratio to the outer diameter of the conductor, Sd ... diameter of the strand, t ... spacing between the fork plates, WS ... spacing between the blade portions.

Claims (1)

A pair of opposing fork plates each having two rows of blade portions with an interval narrower than the outer diameter of the conductor is pressed against an electric wire in which a conductor formed by twisting a plurality of strands is covered with an insulating coating, and the blade In the pressure contact type connector that conducts the conductor and the fork plate by cutting the insulation coating at the part and bringing the blade part into contact with the wire ,
Press type connector of this is set as the fork plate following a parallel and interval t with each other (1) or (2),
The ratio WS / d of the blade interval to the outer diameter of the conductor is set as shown in the following equation (3) ,
The fork plate includes a slot portion for pushing the electric wire,
The slot portion includes, in order from the opening side, a first inclined portion for guiding the electric wire, an edge portion for removing the insulating coating, and a second inclined portion for compressing and rearranging the conductor wires. , Rukoto comprises a chamfer in order to enhance the effect of the coating peeling of the edge portion formed on the side surface of the first inclined portion and the second inclined portion, and said cutting portion for pressure contact against the conductor Pressure contact type connector characterized by

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