JP4055338B2

JP4055338B2 - Contact device

Info

Publication number: JP4055338B2
Application number: JP2000219894A
Authority: JP
Inventors: 勉下村; 律山本; 利一魚留; 英樹榎本; 武彦戸口; 守立野; 善之岩見
Original assignee: Matsushita Electric Works Ltd
Current assignee: Panasonic Electric Works Co Ltd
Priority date: 2000-07-19
Filing date: 2000-07-19
Publication date: 2008-03-05
Anticipated expiration: 2020-07-19
Also published as: JP2002042625A

Description

【０００１】
【発明の属する技術分野】
本発明は、主として電力によって走行する移動体において電路の開閉に用いられる接点装置に関するものである。
【０００２】
【従来の技術】
従来から、この種の接点装置は電動走行する自動車の電源の開閉などの目的で用いられている。この種の接点装置は、一般には器体の内部に電路を開閉する接点機構と、接点機構を開閉駆動する電磁石装置とを収納した構成を有している。
【０００３】
【発明が解決しようとする課題】
ところで、この種の接点装置では合成樹脂成形品の部品と金属部品とが組み合わせて用いられているものであり、部品構成が十分に合理化されていなかったものであるから、部品点数が比較的多く組立性も十分に高いとは言えないものである。
【０００４】
本発明は上記事由に鑑みて為されたものであり、その目的は、部品構成を合理化して部品点数の低減および組立性の向上を可能とした接点装置を提供することにある。
【０００５】
【課題を解決するための手段】
請求項１の発明は、電路を開閉する接点機構と、接点機構を開閉駆動する電磁石装置と、接点機構および電磁石装置を収納する器体とを備える接点装置であって、器体が、一面開口し開口周縁に立ち上がり縁を備えたボディと、ボディの立ち上がり縁の内側で段下がりとなった受け面に当接する形でボディに覆着されるカバーとからなり、接点機構の近傍で器体の外側面にはボディ側とカバー側との外側面に当接する形で配設されアークに引き延ばし方向の磁界を作用させる一対の永久磁石と、各永久磁石をそれぞれ一片に保持し他片が重ね合わされた形でボディとカバーとに跨って貫設された差込孔に圧入されるＬ字状のヨークとを備え、ボディにおいて立ち上がり縁を形成した面と隣り合う１つの周壁に嵌合切欠が形成され、嵌合切欠の周縁の一部にボディの内側面に開放された合わせ溝が形成されるとともに嵌合切欠の周縁の残りの部分にボディの外面側が内面側よりも広幅になった受け段が形成され、カバーには合わせ溝に嵌合する合わせ突起を備えるとともに受け段に合致する受け片を備えていて嵌合切欠に嵌合する嵌合突片が形成され、ボディにおいて嵌合切欠を設けた周壁と隣り合う周壁の立ち上がり縁にはカバーを係止する複数個の押さえ突起が突設されているものである。この構成によれば、ボディとカバーとを複数箇所で結合するから、ボディとカバーとの位置合わせが容易になって組立性が向上する。しかも、２つのヨークでボディとカバーとを挟み込む形になっているから、ボディとカバーとが分離しないように位置決めすることができる。
請求項２の発明は、請求項１の発明において、前記電磁石装置が、コイルと、コイルを囲むヨークと、コイルの一端部内に挿入されヨークに磁気結合されたスライド筒と、スライド筒に挿入されコイルの軸方向に移動可能な可動鉄心と、ヨークにおけるコイルの他端側の部位と前記可動鉄心とをコイルの非励磁時に引き離す向きに付勢する復帰ばねとを備え、スライド筒と可動鉄心との少なくとも一方に移動時の摩擦を軽減するとともにレシジュアル性を付与する材料をコーティングしているものである。この構成によれば、スライド筒と可動鉄心との少なくとも一方に摩擦の軽減およびレシジュアル性を付与する材料をコーティングしているから、可動鉄心をスライド筒に対して滑らかに移動させることができ、またコイルを励磁して可動鉄心をコイルの他端側でヨークに吸着させた後にコイルの励磁を解除すると復帰ばねのばね力によって可動鉄心をヨークから容易に分離させることができる。この機能は別途の部材を設けることなくスライド筒と可動鉄心との少なくとも一方にコーティングを施すだけで実現されるから、部品点数の増加がなく、組立作業も容易である。
【０００６】
請求項３の発明は、請求項１の発明において、前記電磁石装置が、コイルと、コイルを囲むヨークと、コイルの一端部内に挿入されヨークに磁気結合されたスライド筒と、スライド筒に挿入されコイルの軸方向に移動可能な可動鉄心と、ヨークにおけるコイルの他端側の部位と前記可動鉄心とをコイルの非励磁時に引き離す向きに付勢する復帰ばねとを備え、スライド筒がヨークと連続一体に形成されているものである。この構成によれば、スライド筒がヨークと連続一体であるから、スライド筒を別体で形成してヨークに結合する場合に比較すると部品点数が少なくなり組立性も向上する。
【０００７】
請求項４の発明は、請求項１の発明において、前記電磁石装置が、コイルと、コイルを囲むヨークと、コイルの一端部内に挿入されヨークに磁気結合されたスライド筒と、スライド筒に挿入されコイルの軸方向に移動可能な可動鉄心と、ヨークにおけるコイルの他端側の部位と前記可動鉄心とをコイルの非励磁時に引き離す向きに付勢する復帰ばねとを備え、ヨークにおいてコイルの上記他端側の部位にコイル内に挿入される案内筒が連続一体に形成され、案内筒の先端面が可動鉄心の一面に対向するものである。この構成によれば、ヨークに一体に形成された案内筒の先端面が可動鉄心の一面に対向するから、案内筒の先端面が可動鉄心に対向する磁極面として機能し、可動鉄心とヨークとの対向面積が大きくなるとともに、磁極面と可動鉄心との距離が近くなってコイルの励磁時に可動鉄心に大きな吸引力を作用させることができる。しかも、ヨークに案内筒が連続一体に形成されているから、別途に形成した案内筒をヨークに結合する場合に比較すると、部品点数が少なくなり組立性が向上する。
【０００８】
請求項５の発明は、請求項４の発明において、前記案内筒と前記可動鉄心との対向面の一方に先端側ほど径を小さくする突部を設け、他方に突部が挿入可能となるように底側ほど径を小さくする凹部を設けたものである。この構成によれば、案内筒と可動鉄心との対向面積をより一層を大きくすることができ、コイルの励磁時に可動鉄心に作用する吸引力をより一層高めることができる。
【０００９】
請求項６の発明は、請求項１ないし請求項５の発明において、前記接点機構が、それぞれ固定接点を固着した一対の固定端子板と、各固定接点に離接する一対の可動接点を両端部に固着した可動接触子とを備え、可動接触子の中間部を保持するホルダ部を一端部に備えるとともに前記可動鉄心に挿通された形で可動鉄心に固定される連結軸部を他端部に備えた合成樹脂成形品の接触子ホルダを介して前記電磁石装置と前記接点機構とが結合されているものである。この構成によれば、可動接触子と可動鉄心とを結合する接触子ホルダを合成樹脂成形品の１部品で形成しているから、接触子ホルダを低コストで形成することができる。
【００１０】
請求項７の発明は、請求項６の発明において、前記接触子ホルダの中間部には前記可動鉄心における前記コイルの前記他端側の面に対向する係止部が形成され、可動鉄心と係止部との間にはスペーサが介装され、連結軸部の先端部に螺合するナットと係止部との間で可動鉄心とスペーサとが挟持されるものである。この構成によれば、スペーサの厚み寸法を調節することによって案内筒と可動鉄心との対向面間の距離を調節することができ、可動接触子のオーバトラベル量や感動電圧をスペーサの厚みによって調節することができる。
【００１１】
請求項８の発明は、請求項４の発明において、前記接点機構が、それぞれ固定接点を固着した一対の固定端子板と、各固定接点に離接する一対の可動接点を両端部に固着した可動接触子とを備え、可動接触子の中間部を保持するホルダ部を一端部に備えるとともに前記可動鉄心に挿通された形で固定される連結軸部を他端部に備えた合成樹脂成形品の接触子ホルダを介して前記電磁石装置と前記接点機構とが結合され、接触子ホルダの中間部が前記案内筒に挿入されるとともに案内筒の内周面に摺接するガイドが接触子ホルダの周面に形成されているものである。この構成によれば、案内筒の内周面に摺接するガイドを接触子ホルダに設けているから、可動鉄心と接触子ホルダとからなる可動部材の移動方向における一端部がスライド筒により支持され他端部がガイドにより支持されるから、比較的離れた２点で可動部材が支持されることになり、稼働部材のがたつきが防止される。
【００１２】
請求項９の発明は、請求項６ないし請求項８の発明において、前記ホルダ部には前記可動接点の前記固定接点に対する接触圧を付与する接圧ばねが前記可動接触子の中間部とともに保持され、接圧ばねはコイルばねであって接圧ばねをホルダ部に装着可能とする組立孔がホルダ部の一面に開口し、ホルダ部の内部には接圧ばねの一端部に挿入されるばね受け突起が形成され、ばね受け突起の先端面には組立孔側ほど突出量を小さくする傾斜面が形成されているものである。この構成によれば、ホルダ部の一面に組立孔を形成して接圧ばねをホルダ部内に挿入可能としてあり、しかも接圧ばねの一端部に挿入されるばね受け突起に傾斜面を設けているから、接圧ばねをホルダ部に装着する作業が容易になる。
【００１３】
請求項１０の発明は、請求項１の発明において、前記接点機構が固定接点を固着し一端部を器体の外部に突出させた固定端子板を備え、固定端子板において器体の外部に突出する部位にはナットが螺合した端子ねじが挿通されるとともに、端子ねじの近傍の側部に端子ねじを挿通している透孔の周縁の一部を端子ねじに密着させるようにかしめ可能とする程度に薄肉化するカット部が形成されているものである。この構成によれば、固定端子板の一部をかしめて端子ねじを保持することができるから、端子ねじのがたつきを防止することができ、接点機構の開閉時において端子ねじががたついて騒音を発生するのを防止することができる。
【００１４】
請求項１１の発明は、請求項１の発明において、前記接点機構が固定接点を固着し一端部を器体の外部に突出させた固定端子板を備え、固定端子板において器体の外部に突出する部位にはナットが螺合した端子ねじが挿通され、器体の外側面であって端子ねじの頭部近傍には、端子ねじの頭部に当接して端子ねじを回り止めするとともに端子ねじの頭部を受けて固定端子板からの端子ねじの脱落を防止する肩部が形成されているものである。この構成によれば、ナットを緩めても端子ねじが肩部に受けられることで器体から端子ねじが脱落することがなく、またナットを締め付けるときには端子ねじが供回りすることがない。
【００１６】
【発明の実施の形態】
接点装置は、図１ないし図６に示すように、合成樹脂成形品の器体１に、電路を開閉する接点機構２と、接点機構２を開閉駆動する電磁石装置３とを収納した構成を有する。器体１の材料としては、水酸化マグネシウムを添加したナイロン６あるいはナイロン６６、ＰＢＴ、もしくは不飽和ポリエステルを用いる。これらの材料は接点機構２の開極時に生じるアークにより加熱されると消弧性のガスを発生する。なお、器体１を形成する材料は消弧性のガスを発生可能な材料であれば、上述したものに限定されるものではない。
【００１７】
器体１は、一面側が開放された箱状に形成され接点機構２および電磁石装置３を収納するボディ１ａと、ボディ１ａの上記一面側に覆着されるカバー１ｂとからなり、後述するように、ボディ１ａとカバー１ｂとはシール材を用いて封着される。ボディ１ａは、図７ないし図１３に示すように、下側収納部１０の上面中央部に、下側収納部１０よりも前後方向（図７の面に直交する方向）の寸法の小さい上側収納部２０が連続一体に突設された形状に形成されている。ただし、下側収納部１０の上部と上側収納部２０の下部とにおける左右方向（図７における左右方向）の寸法は等しく、下側収納部１０と上側収納部２０との左右の各外側面は面一に連続している。
【００１８】
下側収納部１０の左右の各外側面には、それぞれ１つずつの取付台１１が突設され、各取付台１１の下面はボディ１ａの下面と同一平面に揃えられている。また、一方の取付台１１は下側収納部１０の後部に設けられるとともに後面がボディ１ａの後面と同一平面に揃えられ、他方の取付台１１は下側収納部１０の前部に設けられるとともに前面がボディ１ａの前面と同一平面に揃えられている。各取付台１１には上下に貫通する取付孔１１ａが穿孔され、取付孔１１ａには金属製の受け筒１１ｂが圧入される。器体１を別部材に固定する際には、受け筒１１ｂにねじなどの固定具を挿通する。
【００１９】
下側収納部１０の下壁内周面には左右に離間して一対の支持リブ１２が突設される。また、下側収納部１０の左右の両側壁内周面の下部にはそれぞれ位置決めリブ１３ａ，１３ｂが突設される。位置決めリブ１３ａ，１３ｂよりも上方であって下側収納部１０の内部には左右両側壁に沿う部分と上側収納部２０の下端に沿って形成される部分とを連続させてＬ字状に形成した一対の隔壁１４が形成される。各隔壁１４は下側収納部１０の左右の側壁とは離間して形成され、左右の側壁との間に通気路１５を形成する。隔壁１４のうち上側収納部２０の下端に沿う部分の前端面には上側が切欠された位置合わせ段部１４ａが形成される。下側収納部１０の下壁における左右方向の中央部にはボディ１ａの前縁に開放されたＵ字状の嵌合切欠１６が形成される。嵌合切欠１６の周縁のうち後端側（Ｕ字の底部分）には下壁の上面側に開放された合わせ溝１６ａが形成され、嵌合切欠１６の周縁の残りの部分には下壁の下面側が上面側よりも広幅になった受け段１６ｂが形成される。さらに、下側収納部１０の一方の側壁の下部には位置決めリブ１３ｂの上下においてボディ１ａの前縁に開放されたＵ字状の導出溝１７ａ，１７ｂが形成される。上側の導出溝１７ｂは位置決めリブ１３ｂの近傍に形成され、位置決めリブ１３ｂには導出溝１７ｂと同程度の幅を有し位置決めリブ１３ｂの前縁に開放されたガイド溝１３ｃが形成される。つまり、導出溝１７ｂとガイド溝１３ｃとは中心線方向が互いに直交することになる。
【００２０】
上側収納部２０は上述のように下部においては左右方向の寸法が下側収納部１０と等しいが、上側収納部２０の上部外側面には左右一対の肩部２１が形成されて肩部２１よりも上側は下側よりも左右方向の寸法が小さく形成されている。また、上側収納部２０の周壁において肩部２１よりも上方には切り溝２２が形成され、切り溝２２よりも上側は下側よりも左右方向の寸法が小さく形成されている。切り溝２２の下側面は端子台２３の上面であり、端子台２３は左右一対設けられている。各端子台２３は前後方向に貫通する差込孔２３ａを備える角筒状であって、差込孔２３ａは断面形状が左右方向に長い矩形状になっている。また、差込孔２３ａの前端部は後部よりも断面積が大きく形成され、差込孔２３ａの前端部と後部との間に段差部２３ｂが形成されている。
【００２１】
両端子台２３の間は左右方向において離間しており、両端子台２３の間には上側収納部２０の上壁内側面に突設された突台部２４が挿入される。この突台部２４と各端子台２３との間には接点機構２を構成する固定端子板４０（後述する）の厚み寸法に相当する間隙が形成される。突台部２４の下面は端子台２３の上下の中間部に位置し、突台部２４の下面中央部には端子台２３の下面よりも下方に突出する分離突起２４ａが突設される。また、上側収納部２０の上壁には周壁よりも内側で端子台２３の上面に対向する押さえリブ２５が突設される。端子台２３の上面と押さえリブ２５の先端面との間の間隙の寸法は、切り溝２２の上下方向の幅に等しく、接点機構２を構成する固定端子板４０の厚み寸法に相当する寸法に設定される。したがって、突台部２４の左右の側面と各押さえリブ２５との間には差込溝２６が形成され、また押さえリブ２５と上側収納部２０の側壁との間にも差込溝２６が形成されることになる。また、端子台２３の上面で左右方向において切り溝２２の上側面と押さえリブ２５との間に対応する部位には押さえ突起２３ｃが突設され、端子台２３において突台部２４との対向面にも押さえ突起２３ｃが突設される。一方、上側収納部２０の後面には差込孔２３ａの下方において両差込孔２３ａの左右の両端間に跨る左右寸法を有した矩形状に開口する磁石取付凹所２７が形成されている。
【００２２】
ところで、ボディ１ａの開口周縁には略全周に亘って前方（図７の手前側）に突出する立ち上がり縁２８が形成され、立ち上がり縁２８の内側には立ち上がり縁２８の前面よりも後方に位置する受け面２９が形成される。さらに、ボディ１ａの左右両側壁における立ち上がり縁２８の内側面には、下側収納部１０と上側収納部２０とにおいてそれぞれ左右一対ずつ合計４個の押さえ突起１８が突設される。これらの押さえ突起１８は受け面２９よりも前方に位置し、ボディ１ａの成形時にアンダカットとして形成される。
【００２３】
ボディ１ａに覆着されるカバー１ｂは、図１４ないし図１９に示す形状を有し、ボディ１ａの下側収納部１０に覆着される下側覆着部３０と上側収納部２０に覆着される上側覆着部３１とを連続一体に備える。下側覆着部３０の下縁中央部にはボディ１ａに設けた嵌合切欠１６に嵌合するように周縁がＵ字状に形成された嵌合突片３２が形成され、嵌合突片３２の先端部には合わせ溝１６ａに嵌合する合わせ突起３２ａが突設される。ここに、嵌合切欠１６の周縁に形成されている受け段１６ｂに合致するように、嵌合突片３２の周縁には下面側が上面側よりも広幅になった受け片３２ｂが形成されている。また、嵌合突片３２が嵌合切欠１６に嵌合した状態では、合わせ突起３２ａがボディ１ａの内側に挿入され合わせ溝１６ａに嵌合するようにしてある。
【００２４】
カバー１ｂはボディ１ａの立ち上がり縁２８の内側に嵌合し、受け面２９に当接する形でボディ１ａと結合される。また、カバー１ｂにおいて下側覆着部３０の右側縁には、導出溝１７ａ，１７ｂに挿入され導出溝１７ａ，１７ｂとの間でリード線６８ａ，６８ｂ（後述する）を保持する保持片３３ａ，３３ｂが突設される。上側覆着部３１の下端には隔壁１４に設けた位置合わせ段部１４ａに係合する位置合わせ突起３４が突設され、上側覆着部３１の両側縁には切り溝２２の一部に嵌合する覆い片３５が突設される。上側覆着部３１の後面においてボディ１ａの端子台２３に設けた差込孔２３ａに対応する部位には、差込孔２３ａに挿入可能なガイド筒３６が突設され、ガイド筒３６を差込孔２３ａを挿入した状態では、ガイド筒３６の先端面は差込孔２３ａの段差部２３ｂに当接する。ここに、ガイド筒３６には差込孔３６ａが形成されており、差込孔２３ａにおいて段差部２３ｂよりも後方部位の断面形状と差込孔３６ａの断面形状とは一致している。したがって、差込孔２３ａにガイド筒３６を挿入した状態では差込孔２３ａと差込孔３６ａとは連続した１つの孔になる。さらに、カバー１ｂの外側面であって差込孔３６ａの下方には両差込孔３６ａの左右の両端間に跨る左右寸法を有した矩形状に開口する磁石取付凹所３８が形成されている。
【００２５】
差込孔２３ａ，３６ａには、それぞれＬ字状に形成されたヨーク４８の一片が重ね合わされた形で器体１の前後から挿入される。各ヨーク４８の他片にはそれぞれ永久磁石４９が固着される。各ヨーク４８の上記他片はそれぞれ器体１の前後（つまり、ボディ１ａの後面とカバー１ｂの前面）に配置され、器体１の前後両外側面に形成した磁石取付凹所２７，３８と各ヨーク４８の上記他片との間に永久磁石４９が保持される。
【００２６】
ところで、カバー１ｂの上部内側面にはボディ１ａに設けた各差込溝２６にそれぞれ挿入される４本の差込突起３７が突設される。カバー１ｂの複数箇所には表裏に貫通した注入孔３９が形成されている。注入孔３９は、位置決めリブ１３ａの近傍に１個、位置決めリブ１３ｂの近傍に２個、導出溝１７ａの近傍に１個、各差込突起３７の近傍にそれぞれ１個ずつ設けられ、合計８個の注入孔３９が形成されている。これらの注入孔３９は液状のシール材を注入するために設けられ、ボディ１ａに接点機構２および電磁石装置３を収納し、カバー１ｂをボディ１ａに覆着した後に、シール材を注入孔３９から注入することによって、ボディ１ａ内に配置された接点機構２を固定するとともに、ボディ１ａとカバー１ｂとを封着することができるように注入孔３９の位置が設定されている。
【００２７】
ボディ１ａに収納される接点機構２は、それぞれ固定接点２ａを保持した２個の固定端子板４０と、各固定接点２ａに離接する２個の可動接点２ｂを保持した可動接触子４１とを備える。固定端子板４０は、ボディ１ａに設けた端子台２３を囲むように形成され、端子台２３の上面に沿って延長された端子片４０ａと、端子台２３の下面に沿って延長された接点保持片４０ｂと、端子片４０ａと接点保持片４０ｂとの一端間を連結する連結片４０ｃとを連続一体に備えるコ字状に形成されている。端子片４０ａの一端部は切り溝２２を通してボディ１ａの外側に突出しており、ボディ１ａの内部では端子台２３と押さえリブ２５との間に挟持される。ここに、端子台２３には押さえ突起２３ｃが突設されているから、端子片４０ａは切り溝２２の上側面および押さえリブ２５の下面と押さえ突起２３ｃとの間に挟持されることになり、ボディ１ａに対してがたつきなく保持される。また、連結片４０ｃは端子台２３と突台部２４との間で保持され、端子台２３における突台部２４との対向面にも押さえ突起２３ｃが突設されているから、連結片４０ｃが突台部２４と押さえ突起２３ｃとの間で挟持され、連結片４０ｃはボディ１ａに対してがたつきなく保持される。接点保持片４０ｂの下面には固定接点２ａが固着される。さらに、端子片４０ａにおいてボディ１ａの外側に突出する部位には端子ねじ４３が設けられる。端子ねじ４３は六角頭であって、端子片４０ａには下側から挿入されており、ボディ１ａの外側面に設けた肩部２１により脱落が防止されるとともに、肩部２１よりも上側においてボディ１ａの外側面に当接することによって回り止めがなされている。端子ねじ４３の脚部には座金４４が装着されナット４５が螺合する。このような構成によって、ナット４５が緩んだときにも端子ねじ４３が脱落するのを防止することができ、かつナット４５を締め付ける際に端子ねじ４３が回るのを防止することができる。さらに、端子片４０ａにおいて端子ねじ４３が挿通されている部位の近傍には両側縁をＶ字状に切欠したカット部４６され、端子ねじ４３が挿通されている透孔の周縁が薄肉に形成されている。したがって、カット部４６において端子片４０ａをかしめることができ、端子ねじ４３のねじ部に端子片４０ａの一部を食い込ませることで、端子ねじ４３の端子片４０ａに対するがたつきを防止することができる。この構成によって端子片４０ａと端子ねじ４３との遊びによるがたつきを防止し、結果的に振動音の発生を抑制することができる。
【００２８】
２個の固定接点２ａに対してそれぞれ離接する２個の可動接点２ｂは上述のように可動接触子４１の両端部に固着されている。つまり、可動接触子４１が上下に移動することによって、両固定端子板４０の間が可動接触子４１を通して電気的に接続される状態と、両固定端子板４０の間が電気的に分離される状態とが選択され、接点機構２が開閉されるのである。可動接触子４１は、各可動接点２ｂが固着され接点保持片４０ｂに対向して配置される一対の接点保持片４１ａを備えるとともに、両接点保持片４１ａの間を連結する上方に開放されたコ字状の橋絡片４１ｂとを連続一体に備える。また、橋絡片４１ｂの下面にはばね受け凹所４１ｃが形成されている。可動接触子４１の長手方向の中間部である橋絡片４１ｂは合成樹脂成形品である接触子ホルダ５０に挿入される。
【００２９】
接触子ホルダ５０は、図２０および図２２に示すように、可動接触子４１を保持するホルダ部５１の下面から断面十字形の上軸部５２が突設され、上軸部５２の下端に設けた円形の係止部５３の下面から断面十字形の下軸部５４が突設され、さらに下軸部５４の下端に設けた円形の係止部５５の下面から連結軸部５６が突設された形状に形成されている。上軸部５２の上下方向の中間部には外形形状が円形であるガイド５２ａが形成され、連結軸部５６の下部外周面には螺子部５６ａが形成されている。ホルダ部５１は可動接触子４１の厚み寸法よりも上下寸法が大きく形成され左右に貫通する貫通孔５１ａを有し、ホルダ部５１の前壁には左右方向の中央部で貫通孔５１ａに連通する組立窓５１ｂが形成されている。貫通孔５１ａの下面中央部にはばね受け突起５１ｃが突設され、ばね受け突起５１ｃの上面は後方に向かって上り傾斜する傾斜面５１ｄになっている。ホルダ部５１の貫通孔５１ａには、可動接触子４１の橋絡片４１ｂとともにコイルばねからなる接圧ばね４７が装着される。接圧ばね４７の上端部は橋絡片４１ｂの下面に形成されたばね受け凹所４１ｃに挿入され、接圧ばね４７の下端部にはばね受け突起５１ｃが挿入される。ここにおいて、ばね受け突起５１ｃには傾斜面５１ｄが形成されているから、組立時には接圧ばね４７の下面を傾斜面５１ｄに沿って押し込むことによって、接圧ばね４７をホルダ部５１に容易に装着することができる。
【００３０】
接触子ホルダ５０の下部は電磁石装置３に設けた可動鉄心６１に結合される。電磁石装置３は、コイル６０とコイル６０内で上下に移動する可動鉄心６１とを備え、可動鉄心６１に上述した接触子ホルダ５０が結合される。コイル６０は、合成樹脂成形品である円筒状のコイルボビン６２に巻装され、コイルボビン６０は、上方に開放されたコ字状の下部ヨーク６３と、下部ヨーク６３の両脚片の上端間に跨る上部ヨーク６４により囲まれる。つまり、電磁石装置３のヨークは下部ヨーク６３と上部ヨーク６４とにより構成される。下部ヨーク６３は図２３ないし図２６に示すように両脚片の上端部に各一対の連結溝６３ａを備え、上部ヨーク６４は図２７および図２８に示すように両側縁に連結溝６３ａと嵌合する各一対の連結突起６４ａを備えている。下部ヨーク６３の下片の中央部には上方に立ち上がる円筒状のスライド筒６３ｂがカウンタシンクとして形成され、スライド筒６３ｂはコイルボビン６２の下部内に挿入される。一方、上部ヨーク６４の中央部には下方に突出する円筒状の案内筒６４ｂが連続一体に形成され、案内筒６４ｂの下壁の中央部には挿通孔６４ｃが形成され、案内筒６４ｂの下壁の下面中央部にはばね受け溝６４ｄが形成される。
【００３１】
ところで、可動鉄心６１はスライド筒６３ｂに挿入される円筒状に形成されており、可動鉄心６１の外周面にはスライド筒６３ｂとの摩擦を低減するとともに可動鉄心６１と案内筒６４ｂの下面である磁極面との分離を容易にする（いわゆる、レシジュアル性）ために樹脂（たとえばフッ素樹脂）がコーティングされる。このように、可動鉄心６１の移動方向を上下方向に規制するスライド筒６３ｂが下部ヨーク６３に一体に形成されているから、スライド筒６３ｂを下部ヨーク６３とは別部品で構成する場合よりも部品点数を削減することができる。
【００３２】
可動鉄心６１の下面には取付凹所６１ａが形成され、可動鉄心６１の上面にはばね保持凹所６１ｂが開口する。取付凹所６１ａとばね保持凹所６１ｂとの間は通孔６１ｃにより貫通している。しかして、ばね保持凹所６１ｂの底面にはスペーサ６９が配設され、上述した接触子ホルダ５０の下端部である連結軸部５６を通孔６１ｃに挿通すると、係止部５５の下面とばね保持凹所６１ｂの底面との間にスペーサ６９が保持された状態で螺子部５６ａの下端部が取付凹所６１ａの中に露出する。この状態で螺子部５６ａにナット６５を螺合させると、係止部５５とナット６５との間で可動鉄心６１を保持することができる。螺子部５６ａの下端部はナット６５に熱融着され、接触子ホルダ５０とナット６５とが分離不能に結合される。ここにスペーサ６９の厚みを調節すれば、案内筒６４ｂの下面である磁極面と可動鉄心６１との距離を調節することが可能になる。なお、上述の例では可動鉄心６１にのみ樹脂のコーティングを施しているが、樹脂のコーティングはスライド筒６３ｂについて施すようにしても、またスライド筒６３ｂと可動鉄心６１との両方に施すようにしてもよい。
【００３３】
可動鉄心６１のばね保持凹所６１ｂと上部ヨーク６４のばね受け溝６４ｄとの間にはコイルばねからなる復帰ばね６６が装着されており、復帰ばね６６は可動鉄心６１を下向きに付勢する。接触子ホルダ５０に設けた上軸部５２は上部ヨーク６４に設けた案内筒６４ｂに挿入される。上軸部５２に設けたガイド５２ａは案内筒６４ｂの内周面に当接するように寸法が設定され、案内筒６４ｂにより接触子ホルダ５０の移動が上下方向に規制される。このように、案内筒６４ｂの上部においてガイド５２ａが当接し、また可動鉄心６１がスライド筒６３ｂに当接するから、接触子ホルダ５０と可動鉄心６１とからなる可動部材を上下の２箇所で支持することになり、しかも支持する２箇所間の距離を大きくとることができるから、接触子ホルダ５０および可動鉄心６１の傾きを抑制することができ、結果的に可動部材の移動時におけるがたつきを抑制して機械的消耗を低減化できる。ここに、接触子ホルダ５０の移動方向を規制する案内筒６４ｂが上部ヨーク６４に連続一体に形成されているから、案内筒６４ｂを別部品で形成する場合よりも部品点数が削減されることになる。また、本実施形態の接触子ホルダ５０は可動接触子４１および接圧ばね４７を保持する機能と、可動鉄心６１を連結する機能とを兼ね備えているから、両機能を別部材で実現する場合よりも部品点数が少なく、とくに合成樹脂成形品により両機能を兼ね備えた接触子ホルダ５０を形成したことによってコストの低減につながるものである。
【００３４】
案内筒６４ｂの下壁上面には弾性材料からなるダンパ６７が装着されており、上軸部５２の下端に設けた係止部５３がダンパ６７に接触可能になっている。すなわち、係止部５３が下方に移動したときにダンパ６７に当接することで衝撃音が緩和されるようにしてある。
【００３５】
上述の構成を有する電磁石装置３は、下部ヨーク６３の下面を支持リブ１２に当接させるとともに、下部ヨーク６３の側面を位置決めリブ１３ａ，１３ｂに当接させる。また、この状態において上部ヨーク６４も隔壁１４と下部ヨーク６３との間に挟持されることになる。コイル６０の末端に接続される２本のリード線（絶縁被覆されている）６８ａ，６８ｂのうちの一方のリード線６８ａは導出溝１７ａを通して器体１の外部に引き出され、他方のリード線６８ｂはガイド溝１３ｃを通った後、導出溝１７ｂを通して器体１の外部に引き出される。つまり、両リード線６８ａ，６８ｂの大部分はボディ１の下壁と位置決めリブ１３ｂとの間に配置されることになる。
【００３６】
ところで、位置決めリブ１３ａ，１３ｂと隔壁１４の下端とは上下に離間しており、この部位に対応して下部ヨーク６３の両脚片の前後両側縁にはそれぞれ逃がし切欠６３ｃが形成されている。つまり、逃がし切欠６３ｃが設けられていることによって、ボディ１ａの両側壁と隔壁１４との間に形成されている通気路１５とコイル６０を配置している空間とが連通している。
【００３７】
上述した構成によって、コイル６０に通電していない状態では復帰ばね６６のばね力により可動鉄心６１が上部ヨーク６４から引き離され、図１の位置に位置することになる。このとき、可動鉄心６１に連結されている接触子ホルダ５０により可動接触子４１が下向きに付勢され、可動接点２ｂは固定接点２ａから引き離される。
【００３８】
一方、コイル６０に所定の電流を通電すると、コイル６０の周囲に形成される磁束が通る経路の磁気抵抗を小さくするように可動鉄心６１が上部ヨーク６４に吸引される。つまり、可動鉄心６１が上方に移動し、これに伴って接触子ホルダ５０が上方に移動し、結果的に可動接点２ｂが固定接点２ａに接触する。このときオーバトラベル量に対応した接圧ばね４７のばね力が固定接点２ａと可動接点２ｂとの間の接点圧として作用することになる。つまり、接点圧はオーバトラベル量に依存するから、上述したダンパ６７ないしスペーサの厚みを調節することによってオーバトラベル量すなわち接点圧を調節することができる。本実施形態では、所望の接点圧が得られるようにスペーサ６９の厚みを調節した後、接触子ホルダ５０の螺子部５６ａにナット６５を螺合させ、連結軸部５６の先端部を熱融着させるのである。
【００３９】
コイル６０に通電されている状態から通電を停止すると、可動鉄心６１は接圧ばね４７のばね力と復帰ばね６６のばね力とによって下方に移動しようとし、このとき可動接点２ｂが固定接点２ａから離れるから、固定接点２ａと可動接点２ｂとの間にアークが生じる。本実施形態では固定接点２ａと可動接点２ｂとの間には直流を流すことを想定しており、電流の向きは一般には一定方向に定められている。上述した永久磁石４９は、この向きの電流によってアークが生じたときに、アークが互いに離れる向きに駆動するために設けられている。つまり、永久磁石４９は固定接点２ａと可動接点２ｂとが設けられている部位に一定方向の磁界を生成しており、可動接点２ｂが固定接点２ａから離れてアークが生じたときに、２つのアークが互いに離れる向きの電磁力が作用するように磁界の向きが設定されているのである。そのため、アークは引き伸ばされ、器体１に付勢されることになる。そして、アークの引き伸ばし効果と器体１からの消弧性ガスの発生により、アーク電圧が急激に上昇し、迅速に遮断が完了する。ただし、この種の接点装置では大電流は上述の向きで使用するものの、小電流については逆向きに流すこともあり、このような小電流に対して生じるアークは永久磁石４９の磁界によって互いに近付く向きに付勢されることになる。そこで、両固定端子板４０の間に設けた突台部２４に分離突起２４ａを突設しているのであって、上述のような小電流に対して生じるアークについては、分離突起２４ａによってアーク長を引き延ばすことが可能になり、迅速に消弧することができる。
【００４０】
上述のように固定接点２ａから可動接点２ｂが離れたときにアークが生じると、高圧のアークガスが発生するが、本実施形態ではボディ１ａの周壁と隔壁１４との間に通気路１５を形成することにより、高圧のアークガスを通気路１５に逃がすことで永久磁石４９のアーク駆動効果と合わせてアークが通気路１５に導かれる。そのためアークはさらに引き延ばされることになり、アーク電圧は上昇し、大電流、高電圧遮断が容易になる。さらに、通気路１５の一端部には下部ヨーク６３に設けた逃がし切欠６３ｃが形成され、逃がし切欠６３ｃを通して通気路１５がコイル６０を配置している空間とも連通しているから、コイル６０の周囲の空間もアークガスを逃がすための空間として利用することができる。また、通気路１５の下端付近にはリード線６８ａ，６８ｂが配置されているが、位置決めリブ１３ｂによってコイル６０の末端付近へアークガスが回り込むのを防止することができるから、リード線６８ａ，６８ｂは位置決めリブ１３ｂによってアークガスから保護されることになる。
【００４１】
ボディ１ａに接点機構２および電磁石装置３が組み込まれた状態で、ボディ１ａにはカバー１ｂが取り付けられる。ここで、ボディ１ａの立ち上がり縁２８の内側にカバー１ｂが装着され、かつボディ１ａの嵌合切欠１６にカバー１ｂの嵌合突片３２が嵌合するとともに、合わせ溝１６ａに合わせ突起３２ａが嵌合することによって、カバー１ｂに反りが発生するのを抑制することができる。しかも、カバー１ｂの周縁はボディ１ａに設けた押さえ突起１８に当接するから、カバー１ｂのボディ１ａに対する位置決めが確実に行われることになる。さらに、ボディ１ａとカバー１ｂとの上部においては差込溝２６に差込突起３７が挿入され、かつボディ１ａとカバー１ｂとが結合された状態で永久磁石４９を保持したヨーク４８がボディ１ａとカバー１ｂとの前後から差込孔２７ａ，３６ａに挿入されるから、器体１の上部においてもボディ１ａとカバー１ｂとが結合されることになる。このように、ボディ１ａにカバー１ｂを組み付け、ヨーク４８をボディ１ａおよびカバー１ｂに装着した状態で、ボディ１ａとカバー１ｂとが位置合わせされた状態で仮結合されることになる。
【００４２】
この状態で上述した８個の注入孔３９に液状のシール材が注入される。シール材はボディ１ａに形成された受け面２９に流れるから、シール材の硬化によってボディ１ａとカバー１ｂとが封着されることになる。ここで、器体１の上部においては固定端子板４０が装着されており、固定端子板４０は可動接点２ｂが固定接点２ａに接触する際の衝撃で振動しやすいから、固定端子板４０の固定強度を高めることによって騒音を低減することが可能になる。そこで、器体１の上部には注入孔３９を４個並設することによって固定端子板４０とボディ１ａとの間にシール材を十分に流し込むことができるようにしてある。ただし、差込溝２６が空間として残されていると多量のシール材が必要になるから、差込溝２６に差込突起３７を挿入することでシール材が流れる空間を小さくし、固定端子板４０を固定するのに十分なシール材を注入しながらも、不必要に多くのシールが注入されるのを防止する構成になっている。
【００４３】
ところで、上述の構成においては、上部ヨーク６４に設けた案内筒６４ｂと可動鉄心６１との対向面を略平面状としていたが、案内筒６４ｂと可動鉄心６１との対向面の一方に突部を設け、他方には突部が挿入可能な凹部を設ける構成を採用してもよい。たとえば、図２９に示すように、案内筒６４ｂの下面の湾曲部分を突部として利用し、この形状に合致する凹部６１ｅを可動鉄心６１に設けるようにすればよい。突部は先端側ほど径を小さくするように傾斜させ、同様に凹部の内側面は底側ほど径を小さくするように傾斜させるのが望ましい。このような構成を採用すれば、案内筒６４ｂと可動鉄心６１との対向面積を大きくすることができ、コイル６０の励磁時における可動鉄心６１への吸引力が増加するから、接点機構２を閉極させるのに要するコイル６０への印加電圧である感動電圧を引き下げることができる。
【００４４】
【発明の効果】
請求項１の発明の構成によれば、ボディとカバーとを複数箇所で結合するから、ボディとカバーとの位置合わせが容易になって組立性が向上する。しかも、２つのヨークでボディとカバーとを挟み込む形になっているから、ボディとカバーとが分離しないように位置決めすることができる。
請求項２の発明の構成によれば、スライド筒と可動鉄心との少なくとも一方に摩擦の軽減およびレシジュアル性を付与する材料をコーティングしているから、可動鉄心をスライド筒に対して滑らかに移動させることができ、またコイルを励磁して可動鉄心をコイルの他端側でヨークに吸着させた後にコイルの励磁を解除すると復帰ばねのばね力によって可動鉄心をヨークから容易に分離させることができる。この機能は別途の部材を設けることなくスライド筒と可動鉄心との少なくとも一方にコーティングを施すだけで実現されるから、部品点数の増加がなく、組立作業も容易である。
【００４５】
請求項３の発明の構成によれば、スライド筒がヨークと連続一体であるから、スライド筒を別体で形成してヨークに結合する場合に比較すると部品点数が少なくなり組立性も向上する。
【００４６】
請求項４の発明の構成によれば、ヨークに一体に形成された案内筒の先端面が可動鉄心の一面に対向するから、案内筒の先端面が可動鉄心に対向する磁極面として機能し、可動鉄心とヨークとの対向面積が大きくなるとともに、磁極面と可動鉄心との距離が近くなってコイルの励磁時に可動鉄心に大きな吸引力を作用させることができる。しかも、ヨークに案内筒が連続一体に形成されているから、別途に形成した案内筒をヨークに結合する場合に比較すると、部品点数が少なくなり組立性が向上する。
【００４７】
請求項５の発明の構成によれば、案内筒と可動鉄心との対向面積をより一層を大きくすることができ、コイルの励磁時に可動鉄心に作用する吸引力をより一層高めることができる。
【００４８】
請求項６の発明の構成によれば、可動接触子と可動鉄心とを結合する接触子ホルダを合成樹脂成形品の１部品で形成しているから、接触子ホルダを低コストで形成することができる。
【００４９】
請求項７の発明の構成によれば、スペーサの厚み寸法を調節することによって案内筒と可動鉄心との対向面間の距離を調節することができ、可動接触子のオーバトラベル量や感動電圧をスペーサの厚みによって調節することができる。
【００５０】
請求項８の発明の構成によれば、案内筒の内周面に摺接するガイドを接触子ホルダに設けているから、可動鉄心と接触子ホルダとからなる可動部材の移動方向における一端部がスライド筒により支持され他端部がガイドにより支持されるから、比較的離れた２点で可動部材が支持されることになり、稼働部材のがたつきが防止される。
【００５１】
請求項９の発明の構成によれば、ホルダ部の一面に組立孔を形成して接圧ばねをホルダ部内に挿入可能としてあり、しかも接圧ばねの一端部に挿入されるばね受け突起に傾斜面を設けているから、接圧ばねをホルダ部に装着する作業が容易になる。
【００５２】
請求項１０の発明の構成によれば、固定端子板の一部をかしめて端子ねじを保持することができるから、端子ねじのがたつきを防止することができ、接点機構の開閉時において端子ねじががたついて騒音を発生するのを防止することができる。
【００５３】
請求項１１の発明の構成によれば、ナットを緩めても端子ねじが肩部に受けられることで器体から端子ねじが脱落することがなく、またナットを締め付けるときには端子ねじが供回りすることがない。
【図面の簡単な説明】
【図１】本発明の実施の形態においてカバーを外した状態の一部切欠正面図である。
【図２】同上の縦断面図である。
【図３】同上の正面図である。
【図４】同上の平面図である。
【図５】同上の側面図である。
【図６】同上の下面図である。
【図７】同上に用いるボディの正面図である。
【図８】同上に用いるボディの背面図である。
【図９】同上に用いるボディの平面図である。
【図１０】同上に用いるボディの下面図である。
【図１１】図７中Ａ−Ａ線断面図である。
【図１２】図７中Ｂ−Ｂ線断面図である。
【図１３】図７中Ｃ−Ｃ線断面図である。
【図１４】同上に用いるカバーの正面図である。
【図１５】同上に用いるカバーの背面図である。
【図１６】同上に用いるカバーの下面図である。
【図１７】同上に用いるカバーの側面図である。
【図１８】図１４中Ａ−Ａ線断面図である。
【図１９】同上に用いるカバーの要部断面図である。
【図２０】同上に用いる接触子ホルダの正面図である。
【図２１】同上に用いる接触子ホルダの縦断面図である。
【図２２】同上に用いる接触子ホルダにおけるホルダ部の水平断面図である。
【図２３】同上に用いる下部ヨークの平面図である。
【図２４】同上に用いる下部ヨークの縦断面図である。
【図２５】同上に用いる下部ヨークの横断面図である。
【図２６】同上に用いる下部ヨークの横断面図である。
【図２７】同上に用いる上部ヨークの平面図である。
【図２８】同上に用いる上部ヨークの縦断面図である。
【図２９】同上の他の構成例を示す要部断面図である。
【符号の説明】
１器体
１ａボディ
１ｂカバー
２接点機構
２ａ固定接点
２ｂ可動接点
３電磁石装置
１６嵌合切欠
１６ａ合わせ溝
１６ｂ受け段
１８押さえ突起
２１肩部
２３ａ差込孔
２８立ち上がり縁
２９受け面
３２嵌合突片
３２ａ合わせ突起
３２ｂ受け片
３６ａ差込孔
４０固定端子板
４１可動接触子
４３端子ねじ
４５ナット
４６カット部
４７接圧ばね
４８ヨーク
４９永久磁石
５０接触子ホルダ
５１ホルダ部
５１ｂ組立孔
５１ｃばね受け突起
５１ｄ傾斜面
５２ａガイド
５５係止部
５６連結軸部
６０コイル
６１可動鉄心
６１ｅ凹部
６３下部ヨーク
６３ｂスライド筒
６４上部ヨーク
６４ｂ案内筒
６５ナット
６６復帰ばね
６９スペーサ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a contact device used to open and close an electric circuit in a moving body that travels mainly by electric power.
[0002]
[Prior art]
Conventionally, this type of contact device has been used for the purpose of opening and closing a power source of an automobile that is electrically driven. This type of contact device generally has a configuration in which a contact mechanism that opens and closes an electric circuit and an electromagnet device that opens and closes the contact mechanism are housed inside the container.
[0003]
[Problems to be solved by the invention]
By the way, in this type of contact device, parts of synthetic resin molded products and metal parts are used in combination, and the parts configuration has not been rationalized sufficiently, so the number of parts is relatively large. It cannot be said that the assemblability is sufficiently high.
[0004]
The present invention has been made in view of the above-described reasons, and an object of the present invention is to provide a contact device that can rationalize the component configuration to reduce the number of components and improve the assemblability.
[0005]
[Means for Solving the Problems]
  The invention of claim 1 is a contact device comprising a contact mechanism that opens and closes an electric circuit, an electromagnet device that opens and closes the contact mechanism, and a container that houses the contact mechanism and the electromagnet device.The body consists of a body that opens on one side and has a rising edge at the periphery of the opening, and a cover that covers the body in contact with the receiving surface that is stepped down inside the rising edge of the body. A pair of permanent magnets that are arranged in contact with the outer surfaces of the body side and the cover side on the outer surface of the body near the, and that apply a magnetic field in the extending direction to the arc, and hold each permanent magnet in one piece. And an L-shaped yoke that is press-fitted into an insertion hole that extends across the body and the cover in a form in which the other pieces are overlapped, and one peripheral wall adjacent to the surface on which the rising edge is formed in the body A fitting notch is formed on the outer peripheral side of the body, and a fitting groove that is open on the inner surface of the body is formed on a part of the peripheral edge of the fitting notch, and the outer surface side of the body is located on the remaining part of the peripheral edge of the fitting notch than the inner surface side. Forming a wide receiving step The cover is provided with an alignment protrusion that fits into the alignment groove and a receiving piece that matches the receiving step, and a fitting protrusion that fits into the fitting notch is formed. A plurality of pressing protrusions for locking the cover are provided on the rising edge of the peripheral wall adjacent to the peripheral wall. According to this configuration, since the body and the cover are coupled at a plurality of locations, alignment between the body and the cover is facilitated, and assemblability is improved. In addition, since the body and the cover are sandwiched between the two yokes, the body and the cover can be positioned so as not to be separated.
The invention of claim 2 is the invention of claim 1, whereinA magnet device includes a coil, a yoke surrounding the coil, a slide cylinder inserted into one end of the coil and magnetically coupled to the yoke, a movable iron core inserted into the slide cylinder and movable in the axial direction of the coil, and a coil in the yoke A return spring that urges the part on the other end side and the movable iron core away from each other when the coil is not energized, reducing friction during movement to at least one of the slide cylinder and the movable iron core, and providing a regenerative property. The material to be applied is coated. According to this configuration, since at least one of the slide cylinder and the movable iron core is coated with a material that provides friction reduction and reciprocity, the movable iron core can be smoothly moved with respect to the slide cylinder. When the coil is de-energized after the coil is excited and the movable iron core is attracted to the yoke at the other end of the coil, the movable iron core can be easily separated from the yoke by the spring force of the return spring. Since this function is realized only by coating at least one of the slide cylinder and the movable iron core without providing a separate member, the number of parts is not increased and the assembling work is easy.
[0006]
  Claim 3The invention ofIn the invention of claim 1, the electric powerA magnet device includes a coil, a yoke surrounding the coil, a slide cylinder inserted into one end of the coil and magnetically coupled to the yoke, a movable iron core inserted into the slide cylinder and movable in the axial direction of the coil, and a coil in the yoke And a return spring that urges the movable iron core and the movable iron core away from each other when the coil is not energized, and the slide cylinder is formed integrally with the yoke. According to this configuration, since the slide cylinder is continuously integrated with the yoke, the number of parts is reduced and the assemblability is improved as compared with the case where the slide cylinder is formed separately and coupled to the yoke.
[0007]
  Claim 4The invention ofIn the invention of claim 1, the electric powerA magnet device includes a coil, a yoke surrounding the coil, a slide cylinder inserted into one end of the coil and magnetically coupled to the yoke, a movable iron core inserted into the slide cylinder and movable in the axial direction of the coil, and a coil in the yoke A return spring that urges the movable iron core and the movable iron core away from each other when the coil is not energized, and a guide cylinder inserted into the coil is continuously inserted into the coil at the other end of the coil. It is integrally formed, and the tip surface of the guide tube is opposed to one surface of the movable iron core. According to this configuration, since the front end surface of the guide tube integrally formed with the yoke faces one surface of the movable iron core, the front end surface of the guide tube functions as a magnetic pole surface facing the movable iron core. And the distance between the magnetic pole surface and the movable iron core is reduced, and a large attractive force can be applied to the movable iron core when the coil is excited. In addition, since the guide tube is continuously formed integrally with the yoke, the number of parts is reduced and the assemblability is improved as compared with the case where a separately formed guide tube is coupled to the yoke.
[0008]
  Claim 5The invention ofClaim 4In the invention ofSaidWith guide tubeSaidOne of the surfaces facing the movable iron core is provided with a protruding portion whose diameter decreases toward the tip side, and the other is provided with a concave portion whose diameter decreases toward the bottom side so that the protruding portion can be inserted. According to this configuration, the facing area between the guide tube and the movable iron core can be further increased, and the attractive force acting on the movable iron core when the coil is excited can be further increased.
[0009]
  Claim 6The invention of claim 1 to claim 1Claim 5In the invention, the contact mechanism includes a pair of fixed terminal plates each having a fixed contact fixed thereto, and a movable contact having a pair of movable contacts attached to and separated from each fixed contact at both ends. The electromagnet through a contact holder of a synthetic resin molded article having a connecting shaft portion fixed to the movable iron core in a form inserted into the movable iron core at one end while holding a holder portion for holding the portion. The device and the contact mechanism are combined. According to this structure, since the contact holder which couple | bonds a movable contact and a movable iron core is formed with one component of a synthetic resin molded product, a contact holder can be formed at low cost.
[0010]
  Claim 7The invention ofClaim 6In the invention ofSaidIn the middle part of the contact holderSaidA locking portion is formed in the movable iron core that faces the other end surface of the coil, a spacer is interposed between the movable iron core and the locking portion, and a nut that is screwed into the distal end portion of the connecting shaft portion. The movable iron core and the spacer are sandwiched between and the locking portion. According to this configuration, the distance between the opposing surfaces of the guide cylinder and the movable iron core can be adjusted by adjusting the thickness dimension of the spacer, and the amount of overtravel and the moving voltage of the movable contact can be adjusted by the thickness of the spacer. can do.
[0011]
  Claim 8The invention ofClaim 4In the invention, the contact mechanism includes a pair of fixed terminal plates each having a fixed contact fixed thereto, and a movable contact having a pair of movable contacts attached to and separated from each fixed contact at both ends. The electromagnet device and the electromagnet device via a contact holder of a synthetic resin molded article having a connecting shaft portion fixed to the other end portion and having a holder portion for holding the portion at one end portion and being fixed to the movable iron core. A contact mechanism is coupled, and an intermediate portion of the contact holder is inserted into the guide tube, and a guide that is slidably in contact with the inner peripheral surface of the guide tube is formed on the peripheral surface of the contact holder. According to this configuration, since the contact holder is provided with the guide slidably contacting the inner peripheral surface of the guide cylinder, one end portion in the moving direction of the movable member composed of the movable iron core and the contact holder is supported by the slide cylinder. Since the end portion is supported by the guide, the movable member is supported at two relatively distant points, and rattling of the operating member is prevented.
[0012]
  Claim 9The invention ofClaims 6 to 8In the invention, a contact pressure spring for applying a contact pressure of the movable contact to the fixed contact is held together with an intermediate portion of the movable contact, and the contact pressure spring is a coil spring, and the contact pressure spring is provided on the holder portion. An assembly hole that can be attached to the holder portion opens on one surface of the holder portion, and a spring receiving protrusion that is inserted into one end portion of the contact pressure spring is formed inside the holder portion, and an assembly is formed on the tip surface of the spring receiving protrusion. An inclined surface that reduces the protruding amount toward the hole side is formed. According to this configuration, an assembly hole is formed on one surface of the holder portion so that the contact pressure spring can be inserted into the holder portion, and an inclined surface is provided on the spring receiving projection inserted into one end portion of the contact pressure spring. Therefore, the work of attaching the contact pressure spring to the holder portion becomes easy.
[0013]
  Claim 10The invention ofIn the invention of claim 1,The contact mechanism includes a fixed terminal plate having a fixed contact fixed and one end projecting to the outside of the device body, and a terminal screw having a nut screwed is inserted into a portion of the fixed terminal plate projecting to the exterior of the device body. In addition, a cut portion that is thinned to the extent that it can be caulked so that a part of the peripheral edge of the through hole through which the terminal screw is inserted is closely attached to the terminal screw is formed on the side portion in the vicinity of the terminal screw. It is. According to this configuration, since the terminal screw can be held by caulking a part of the fixed terminal plate, rattling of the terminal screw can be prevented, and the terminal screw rattles when the contact mechanism is opened and closed. Generation of noise can be prevented.
[0014]
  Claim 11The invention ofIn the invention of claim 1,The contact mechanism includes a fixed terminal plate having a fixed contact fixed and one end projecting to the outside of the device body, and a terminal screw having a nut screwed is inserted into a portion of the fixed terminal plate projecting to the exterior of the device body. The terminal screw is in contact with the head of the terminal screw on the outer surface of the container and near the head of the terminal screw to prevent the terminal screw from rotating. The shoulder part which prevents drop-off is formed. According to this configuration, even if the nut is loosened, the terminal screw is received by the shoulder portion, so that the terminal screw does not fall off from the body, and when the nut is tightened, the terminal screw does not rotate.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
As shown in FIGS. 1 to 6, the contact device has a configuration in which a contact mechanism 2 that opens and closes an electric circuit and an electromagnet device 3 that opens and closes the contact mechanism 2 are housed in a container 1 of a synthetic resin molded product. . As the material of the container 1, nylon 6 or nylon 66, PBT, or unsaturated polyester to which magnesium hydroxide is added is used. When these materials are heated by an arc generated when the contact mechanism 2 is opened, an arc extinguishing gas is generated. In addition, the material which forms the container 1 will not be limited to what was mentioned above if it is a material which can generate | occur | produce arc extinguishing gas.
[0017]
The container 1 is formed of a body 1a that is formed in a box shape that is open on one side and houses the contact mechanism 2 and the electromagnet device 3, and a cover 1b that is covered on the one side of the body 1a, as will be described later. The body 1a and the cover 1b are sealed using a sealing material. As shown in FIGS. 7 to 13, the body 1 a is stored in the upper center portion of the lower storage portion 10 having a smaller size in the front-rear direction (direction perpendicular to the plane of FIG. 7) than the lower storage portion 10. The part 20 is formed in a shape projecting continuously and integrally. However, the left and right outer surfaces of the lower storage portion 10 and the upper storage portion 20 are the same in the left-right direction (the left-right direction in FIG. 7) in the upper portion of the lower storage portion 10 and the lower portion of the upper storage portion 20. It is continuous.
[0018]
A mounting table 11 is provided on each of the left and right outer surfaces of the lower storage portion 10 so that the lower surface of each mounting table 11 is flush with the lower surface of the body 1a. One mounting base 11 is provided at the rear part of the lower storage part 10, and the rear surface is aligned with the rear surface of the body 1 a, and the other mounting base 11 is provided at the front part of the lower storage part 10. The front surface is flush with the front surface of the body 1a. Each mounting base 11 is provided with a mounting hole 11a penetrating vertically, and a metal receiving tube 11b is press-fitted into the mounting hole 11a. When fixing the container 1 to another member, a fixing tool such as a screw is inserted into the receiving tube 11b.
[0019]
A pair of support ribs 12 protrude from the inner peripheral surface of the lower wall of the lower storage portion 10 so as to be separated from each other on the left and right. In addition, positioning ribs 13a and 13b project from the lower portions of the inner peripheral surfaces of the left and right side walls of the lower storage portion 10, respectively. Above the positioning ribs 13a and 13b and in the lower storage part 10, a part along the left and right side walls and a part formed along the lower end of the upper storage part 20 are formed in an L shape. A pair of partition walls 14 is formed. Each partition wall 14 is formed to be separated from the left and right side walls of the lower storage portion 10, and forms a ventilation path 15 between the left and right side walls. On the front end surface of the partition wall 14 along the lower end of the upper storage portion 20, an alignment step portion 14 a with the upper side notched is formed. A U-shaped fitting notch 16 opened at the front edge of the body 1a is formed at the central portion in the left-right direction on the lower wall of the lower storage portion 10. An alignment groove 16a opened on the upper surface side of the lower wall is formed on the rear end side (U-shaped bottom portion) of the peripheral edge of the fitting notch 16, and the lower wall is formed on the remaining peripheral edge of the fitting notch 16. A receiving step 16b is formed in which the lower surface side is wider than the upper surface side. Furthermore, U-shaped lead-out grooves 17a and 17b opened at the front edge of the body 1a above and below the positioning rib 13b are formed at the lower portion of one side wall of the lower storage portion 10. The upper lead-out groove 17b is formed in the vicinity of the positioning rib 13b, and a guide groove 13c having a width comparable to that of the lead-out groove 17b and opened at the front edge of the positioning rib 13b is formed in the positioning rib 13b. That is, the lead-out groove 17b and the guide groove 13c are perpendicular to each other in the center line direction.
[0020]
As described above, the upper storage portion 20 has the same size in the left-right direction as the lower storage portion 10 at the lower portion, but a pair of left and right shoulder portions 21 are formed on the upper outer surface of the upper storage portion 20. Also, the upper side is formed with a smaller dimension in the left-right direction than the lower side. In addition, a kerf 22 is formed above the shoulder 21 in the peripheral wall of the upper storage part 20, and a dimension in the left-right direction is smaller on the upper side than the kerf 22 than on the lower side. The lower surface of the kerf 22 is the upper surface of the terminal block 23, and a pair of left and right terminal blocks 23 are provided. Each terminal block 23 has a rectangular tube shape having an insertion hole 23a penetrating in the front-rear direction, and the insertion hole 23a has a rectangular shape whose cross-sectional shape is long in the left-right direction. Further, the front end portion of the insertion hole 23a has a larger cross-sectional area than the rear portion, and a step portion 23b is formed between the front end portion and the rear portion of the insertion hole 23a.
[0021]
The two terminal blocks 23 are spaced apart from each other in the left-right direction, and a projecting base portion 24 protruding from the inner surface of the upper wall of the upper storage portion 20 is inserted between the two terminal blocks 23. A gap corresponding to the thickness dimension of a fixed terminal plate 40 (described later) constituting the contact mechanism 2 is formed between the protruding base 24 and each terminal base 23. The lower surface of the projecting portion 24 is positioned at the upper and lower intermediate portions of the terminal block 23, and a separation protrusion 24 a that projects downward from the lower surface of the terminal block 23 is provided at the center of the lower surface of the projecting portion 24. In addition, a pressing rib 25 is provided on the upper wall of the upper storage portion 20 so as to face the upper surface of the terminal block 23 inside the peripheral wall. The size of the gap between the upper surface of the terminal block 23 and the front end surface of the holding rib 25 is equal to the vertical width of the kerf 22 and is equivalent to the thickness of the fixed terminal plate 40 constituting the contact mechanism 2. Is set. Therefore, the insertion groove 26 is formed between the left and right side surfaces of the projecting portion 24 and each pressing rib 25, and the insertion groove 26 is also formed between the pressing rib 25 and the side wall of the upper storage portion 20. Will be. In addition, a pressing protrusion 23 c protrudes at a portion corresponding to the upper surface of the terminal block 23 between the upper surface of the kerf 22 and the pressing rib 25 in the left-right direction, and the terminal block 23 faces the protruding portion 24. Also, a pressing projection 23c is provided. On the other hand, a magnet mounting recess 27 is formed on the rear surface of the upper storage portion 20 so as to open in a rectangular shape having left and right dimensions straddling the left and right ends of both insertion holes 23a below the insertion holes 23a.
[0022]
By the way, a rising edge 28 that protrudes forward (front side in FIG. 7) is formed on the peripheral edge of the opening of the body 1 a, and is positioned behind the front surface of the rising edge 28 inside the rising edge 28. A receiving surface 29 is formed. Further, a total of four pressing protrusions 18 are provided on the inner side surface of the rising edge 28 on the left and right side walls of the body 1a. These pressing projections 18 are positioned in front of the receiving surface 29, and are formed as undercuts when the body 1a is molded.
[0023]
The cover 1b covered by the body 1a has the shape shown in FIGS. 14 to 19 and covers the lower covering portion 30 and the upper receiving portion 20 covered by the lower receiving portion 10 of the body 1a. The upper covering portion 31 is continuously and integrally provided. A fitting protrusion 32 having a U-shaped peripheral edge is formed at the center of the lower edge of the lower covering portion 30 so as to be fitted in the fitting notch 16 provided in the body 1a. An alignment protrusion 32a that fits into the alignment groove 16a is provided at the tip of the protrusion 32. Here, a receiving piece 32b whose lower surface side is wider than the upper surface side is formed on the peripheral edge of the fitting protrusion 32 so as to match the receiving step 16b formed on the peripheral edge of the fitting notch 16. . Further, in a state where the fitting protrusion 32 is fitted in the fitting notch 16, the fitting protrusion 32a is inserted inside the body 1a and is fitted into the fitting groove 16a.
[0024]
The cover 1b fits inside the rising edge 28 of the body 1a and is coupled to the body 1a so as to abut against the receiving surface 29. Further, on the right edge of the lower covering portion 30 in the cover 1b, holding pieces 33a, which are inserted into the lead-out grooves 17a, 17b and hold lead wires 68a, 68b (described later) between the lead-out grooves 17a, 17b, 33b is projected. An alignment projection 34 that engages with an alignment step 14 a provided on the partition wall 14 protrudes from the lower end of the upper covering portion 31, and is fitted to part of the groove 22 on both side edges of the upper covering portion 31. A mating cover piece 35 is projected. A guide tube 36 that can be inserted into the insertion hole 23a is projected from a portion corresponding to the insertion hole 23a provided in the terminal block 23 of the body 1a on the rear surface of the upper covering portion 31, and the guide tube 36 is inserted. In the state in which the hole 23a is inserted, the front end surface of the guide cylinder 36 contacts the step portion 23b of the insertion hole 23a. Here, an insertion hole 36a is formed in the guide tube 36, and the cross-sectional shape of the rear portion of the insertion hole 23a with respect to the step portion 23b coincides with the cross-sectional shape of the insertion hole 36a. Therefore, in the state where the guide tube 36 is inserted into the insertion hole 23a, the insertion hole 23a and the insertion hole 36a become one continuous hole. Further, a rectangular magnet mounting recess 38 having a lateral dimension extending between both left and right ends of both insertion holes 36a is formed on the outer surface of the cover 1b and below the insertion holes 36a. .
[0025]
Inserted into the insertion holes 23a and 36a from the front and rear of the container body 1 is a piece of yoke 48 formed in an L shape. A permanent magnet 49 is fixed to the other piece of each yoke 48. The other pieces of the yokes 48 are respectively arranged on the front and rear of the container body 1 (that is, the rear surface of the body 1a and the front surface of the cover 1b), and the magnet mounting recesses 27 and 38 formed on both the front and rear outer surfaces of the container body 1 A permanent magnet 49 is held between the yoke 48 and the other piece.
[0026]
By the way, four insertion protrusions 37 respectively inserted into the respective insertion grooves 26 provided in the body 1a are projected from the upper inner surface of the cover 1b. Injection holes 39 penetrating the front and back are formed at a plurality of locations on the cover 1b. One injection hole 39 is provided in the vicinity of the positioning rib 13a, two in the vicinity of the positioning rib 13b, one in the vicinity of the lead-out groove 17a, and one in the vicinity of each insertion protrusion 37, for a total of eight. The injection hole 39 is formed. These injection holes 39 are provided for injecting a liquid sealing material. After the contact mechanism 2 and the electromagnet device 3 are accommodated in the body 1 a and the cover 1 b is covered on the body 1 a, the sealing material is inserted from the injection hole 39. By pouring, the contact mechanism 2 arranged in the body 1a is fixed, and the position of the pouring hole 39 is set so that the body 1a and the cover 1b can be sealed.
[0027]
The contact mechanism 2 accommodated in the body 1a includes two fixed terminal plates 40 each holding a fixed contact 2a, and a movable contact 41 holding two movable contacts 2b that are separated from and in contact with each fixed contact 2a. . The fixed terminal plate 40 is formed so as to surround the terminal block 23 provided on the body 1 a, and the terminal piece 40 a extended along the upper surface of the terminal block 23 and the contact holding extended along the lower surface of the terminal block 23. A piece 40b and a connecting piece 40c that connects one end of the terminal piece 40a and one end of the contact holding piece 40b are formed in a U shape. One end portion of the terminal piece 40a protrudes outside the body 1a through the kerf 22 and is sandwiched between the terminal block 23 and the holding rib 25 inside the body 1a. Here, since the pressing protrusion 23c is projected from the terminal block 23, the terminal piece 40a is sandwiched between the upper surface of the cut groove 22 and the lower surface of the pressing rib 25 and the pressing protrusion 23c. The body 1a is held without rattling. Further, since the connecting piece 40c is held between the terminal block 23 and the protruding base portion 24, and the pressing protrusion 23c is also provided on the surface of the terminal block 23 facing the protruding portion 24, the connecting piece 40c is It is clamped between the protrusion 24 and the pressing protrusion 23c, and the connecting piece 40c is held without rattling against the body 1a. The fixed contact 2a is fixed to the lower surface of the contact holding piece 40b. Further, a terminal screw 43 is provided at a portion of the terminal piece 40a that protrudes outside the body 1a. The terminal screw 43 has a hexagonal head and is inserted into the terminal piece 40a from below. The terminal screw 43 is prevented from falling off by the shoulder 21 provided on the outer surface of the body 1a, and the body is located above the shoulder 21. Rotation is prevented by contacting the outer surface of 1a. A washer 44 is attached to a leg portion of the terminal screw 43 and a nut 45 is screwed. With such a configuration, the terminal screw 43 can be prevented from falling off even when the nut 45 is loosened, and the terminal screw 43 can be prevented from turning when the nut 45 is tightened. Further, in the vicinity of the portion where the terminal screw 43 is inserted in the terminal piece 40a, both side edges are cut into V-shaped cut portions 46, and the periphery of the through hole through which the terminal screw 43 is inserted is formed thin. ing. Therefore, the terminal piece 40a can be caulked at the cut portion 46, and the terminal screw 43 can be prevented from rattling against the terminal piece 40a by biting a part of the terminal piece 40a into the screw portion of the terminal screw 43. Can do. With this configuration, rattling due to play between the terminal piece 40a and the terminal screw 43 can be prevented, and as a result, generation of vibration noise can be suppressed.
[0028]
The two movable contacts 2b that are separated from the two fixed contacts 2a are fixed to both ends of the movable contact 41 as described above. That is, when the movable contact 41 moves up and down, the state in which the fixed terminal plates 40 are electrically connected through the movable contact 41 and the fixed terminal plates 40 are electrically separated. The state is selected, and the contact mechanism 2 is opened and closed. The movable contact 41 includes a pair of contact holding pieces 41a to which the respective movable contacts 2b are fixed and opposed to the contact holding pieces 40b, and is connected to the upper side to connect the two contact holding pieces 41a. A character-like bridging piece 41b is provided continuously and integrally. A spring receiving recess 41c is formed on the lower surface of the bridging piece 41b. The bridging piece 41b, which is an intermediate portion in the longitudinal direction of the movable contact 41, is inserted into a contact holder 50 that is a synthetic resin molded product.
[0029]
As shown in FIGS. 20 and 22, the contact holder 50 is provided with a cross-shaped upper shaft portion 52 projecting from the lower surface of the holder portion 51 that holds the movable contact 41 and provided at the lower end of the upper shaft portion 52. A lower shaft portion 54 having a cross-shaped cross section protrudes from the lower surface of the circular locking portion 53, and a connecting shaft portion 56 protrudes from the lower surface of the circular locking portion 55 provided at the lower end of the lower shaft portion 54. It is formed in a different shape. A guide 52 a having a circular outer shape is formed at an intermediate portion in the vertical direction of the upper shaft portion 52, and a screw portion 56 a is formed on the lower outer peripheral surface of the connecting shaft portion 56. The holder part 51 has a through hole 51a that is formed to have a vertical dimension larger than the thickness dimension of the movable contact 41 and penetrates to the left and right. An assembly window 51b is formed. A spring receiving projection 51c protrudes from the center of the lower surface of the through hole 51a, and the upper surface of the spring receiving projection 51c is an inclined surface 51d inclined upward. A contact pressure spring 47 made of a coil spring is mounted in the through hole 51 a of the holder portion 51 together with the bridging piece 41 b of the movable contact 41. The upper end portion of the contact pressure spring 47 is inserted into a spring receiving recess 41 c formed on the lower surface of the bridging piece 41 b, and the spring receiving protrusion 51 c is inserted into the lower end portion of the contact pressure spring 47. Here, since the inclined surface 51d is formed on the spring receiving projection 51c, the contact pressure spring 47 can be easily attached to the holder portion 51 by pushing the lower surface of the contact pressure spring 47 along the inclined surface 51d during assembly. can do.
[0030]
The lower part of the contact holder 50 is coupled to a movable iron core 61 provided in the electromagnet device 3. The electromagnet device 3 includes a coil 60 and a movable iron core 61 that moves up and down in the coil 60, and the contact holder 50 described above is coupled to the movable iron core 61. The coil 60 is wound around a cylindrical coil bobbin 62 which is a synthetic resin molded product, and the coil bobbin 60 is an upper portion straddling between upper ends of both leg pieces of the lower yoke 63 and a U-shaped lower yoke 63 opened upward. Surrounded by the yoke 64. That is, the yoke of the electromagnet device 3 includes the lower yoke 63 and the upper yoke 64. The lower yoke 63 is provided with a pair of connecting grooves 63a at the upper ends of both leg pieces as shown in FIGS. 23 to 26, and the upper yoke 64 is fitted with the connecting grooves 63a on both side edges as shown in FIGS. Each pair of connecting projections 64a is provided. A cylindrical slide cylinder 63 b that rises upward is formed as a counter sink at the center of the lower piece of the lower yoke 63, and the slide cylinder 63 b is inserted into the lower portion of the coil bobbin 62. On the other hand, a cylindrical guide tube 64b that protrudes downward is integrally formed at the center of the upper yoke 64, and an insertion hole 64c is formed at the center of the lower wall of the guide tube 64b. A spring receiving groove 64d is formed at the center of the lower surface of the wall.
[0031]
By the way, the movable iron core 61 is formed in a cylindrical shape to be inserted into the slide cylinder 63b, and the outer peripheral surface of the movable iron core 61 reduces the friction with the slide cylinder 63b and is the lower surface of the movable iron core 61 and the guide cylinder 64b. Resin (for example, fluororesin) is coated to facilitate separation from the magnetic pole surface (so-called recursive property). Thus, since the slide cylinder 63b that regulates the moving direction of the movable iron core 61 in the vertical direction is formed integrally with the lower yoke 63, the slide cylinder 63b is a component rather than a case where the slide cylinder 63b is configured as a separate component. The score can be reduced.
[0032]
A mounting recess 61 a is formed on the lower surface of the movable iron core 61, and a spring holding recess 61 b is opened on the upper surface of the movable iron core 61. The mounting recess 61a and the spring holding recess 61b penetrate through the through hole 61c. Thus, the spacer 69 is disposed on the bottom surface of the spring holding recess 61b. When the connecting shaft portion 56, which is the lower end portion of the contact holder 50, is inserted into the through hole 61c, the lower surface of the locking portion 55 and the spring The lower end portion of the screw portion 56a is exposed in the mounting recess 61a in a state where the spacer 69 is held between the bottom surface of the holding recess 61b. When the nut 65 is screwed into the screw portion 56 a in this state, the movable iron core 61 can be held between the locking portion 55 and the nut 65. The lower end portion of the screw portion 56a is heat-sealed to the nut 65, and the contact holder 50 and the nut 65 are coupled so as not to be separated. If the thickness of the spacer 69 is adjusted here, the distance between the magnetic pole surface, which is the lower surface of the guide cylinder 64b, and the movable iron core 61 can be adjusted. In the above example, the resin coating is applied only to the movable iron core 61. However, the resin coating may be applied to the slide cylinder 63b or to both the slide cylinder 63b and the movable iron core 61. Also good.
[0033]
A return spring 66 made of a coil spring is mounted between the spring holding recess 61b of the movable iron core 61 and the spring receiving groove 64d of the upper yoke 64, and the return spring 66 biases the movable iron core 61 downward. The upper shaft portion 52 provided in the contact holder 50 is inserted into a guide tube 64 b provided in the upper yoke 64. The guide 52a provided on the upper shaft portion 52 is dimensioned so as to contact the inner peripheral surface of the guide cylinder 64b, and the movement of the contact holder 50 is restricted in the vertical direction by the guide cylinder 64b. Thus, since the guide 52a abuts on the upper portion of the guide cylinder 64b and the movable iron core 61 abuts on the slide cylinder 63b, the movable member composed of the contact holder 50 and the movable iron core 61 is supported at two locations, upper and lower. In addition, since the distance between the two places to be supported can be increased, the inclination of the contact holder 50 and the movable iron core 61 can be suppressed, and as a result, rattling during movement of the movable member can be suppressed. The mechanical wear can be reduced by suppressing. Here, since the guide cylinder 64b for restricting the moving direction of the contact holder 50 is formed integrally with the upper yoke 64, the number of parts can be reduced as compared with the case where the guide cylinder 64b is formed as a separate part. Become. Further, the contact holder 50 of the present embodiment has both the function of holding the movable contact 41 and the contact pressure spring 47 and the function of connecting the movable iron core 61, so that both functions are realized by separate members. However, since the number of parts is small, and the contact holder 50 having both functions is formed by a synthetic resin molded product, the cost is reduced.
[0034]
A damper 67 made of an elastic material is mounted on the upper surface of the lower wall of the guide tube 64b, and a locking portion 53 provided at the lower end of the upper shaft portion 52 can come into contact with the damper 67. That is, the impact sound is mitigated by contacting the damper 67 when the locking portion 53 moves downward.
[0035]
In the electromagnet device 3 having the above-described configuration, the lower surface of the lower yoke 63 is brought into contact with the support rib 12, and the side surface of the lower yoke 63 is brought into contact with the positioning ribs 13a and 13b. In this state, the upper yoke 64 is also sandwiched between the partition wall 14 and the lower yoke 63. One of the two lead wires (insulated) 68a, 68b connected to the end of the coil 60 is led out of the body 1 through the lead-out groove 17a, and the other lead wire 68b. After being passed through the guide groove 13c, it is drawn out of the vessel 1 through the lead-out groove 17b. That is, most of both the lead wires 68a and 68b are disposed between the lower wall of the body 1 and the positioning rib 13b.
[0036]
By the way, the positioning ribs 13a and 13b and the lower end of the partition wall 14 are vertically separated from each other, and relief notches 63c are formed on the front and rear side edges of both leg pieces of the lower yoke 63 corresponding to this portion. That is, by providing the relief notch 63c, the air passage 15 formed between the both side walls of the body 1a and the partition wall 14 communicates with the space in which the coil 60 is disposed.
[0037]
With the above-described configuration, when the coil 60 is not energized, the movable iron core 61 is separated from the upper yoke 64 by the spring force of the return spring 66 and is positioned at the position shown in FIG. At this time, the movable contact 41 is urged downward by the contact holder 50 connected to the movable iron core 61, and the movable contact 2b is pulled away from the fixed contact 2a.
[0038]
On the other hand, when a predetermined current is passed through the coil 60, the movable iron core 61 is attracted to the upper yoke 64 so as to reduce the magnetic resistance of the path through which the magnetic flux formed around the coil 60 passes. That is, the movable iron core 61 moves upward, and accordingly the contact holder 50 moves upward, and as a result, the movable contact 2b contacts the fixed contact 2a. At this time, the spring force of the contact pressure spring 47 corresponding to the overtravel amount acts as a contact pressure between the fixed contact 2a and the movable contact 2b. That is, since the contact pressure depends on the overtravel amount, the overtravel amount, that is, the contact pressure can be adjusted by adjusting the thickness of the above-described damper 67 or spacer. In this embodiment, after adjusting the thickness of the spacer 69 so as to obtain a desired contact pressure, the nut 65 is screwed into the screw portion 56a of the contact holder 50, and the distal end portion of the connecting shaft portion 56 is heat-sealed. To make it happen.
[0039]
When the energization is stopped from the state where the coil 60 is energized, the movable iron core 61 tries to move downward by the spring force of the contact pressure spring 47 and the spring force of the return spring 66. At this time, the movable contact 2b is moved from the fixed contact 2a. Since it leaves | separates, an arc arises between the fixed contact 2a and the movable contact 2b. In the present embodiment, it is assumed that a direct current flows between the fixed contact 2a and the movable contact 2b, and the direction of the current is generally determined in a certain direction. The permanent magnet 49 described above is provided to drive the arcs away from each other when an arc is generated by the current in this direction. That is, the permanent magnet 49 generates a magnetic field in a certain direction at a portion where the fixed contact 2a and the movable contact 2b are provided, and when the movable contact 2b leaves the fixed contact 2a and an arc is generated, The direction of the magnetic field is set so that electromagnetic forces in directions in which the arcs are separated from each other act. Therefore, the arc is stretched and urged by the container 1. Then, due to the effect of extending the arc and the generation of arc-extinguishing gas from the vessel 1, the arc voltage rises rapidly and the interruption is completed quickly. However, in this type of contact device, although a large current is used in the above-described direction, a small current may flow in the opposite direction, and arcs generated with respect to such a small current approach each other due to the magnetic field of the permanent magnet 49. It will be biased in the direction. In view of this, the separation protrusion 24a protrudes from the projecting portion 24 provided between the two fixed terminal plates 40, and the arc length caused by the small current as described above is caused by the separation protrusion 24a. Can be extended and can be extinguished quickly.
[0040]
As described above, when an arc is generated when the movable contact 2b is separated from the fixed contact 2a, a high-pressure arc gas is generated. In this embodiment, the air passage 15 is formed between the peripheral wall of the body 1a and the partition wall 14. As a result, the arc is guided to the air passage 15 together with the arc driving effect of the permanent magnet 49 by letting the high-pressure arc gas escape to the air passage 15. As a result, the arc is further extended, the arc voltage rises, and a large current and high voltage interruption becomes easy. Further, an escape notch 63c provided in the lower yoke 63 is formed at one end of the air passage 15, and the air passage 15 communicates with the space in which the coil 60 is disposed through the escape notch 63c. This space can also be used as a space for escaping arc gas. Further, lead wires 68a and 68b are arranged near the lower end of the air passage 15. However, since the positioning rib 13b can prevent the arc gas from flowing around the end of the coil 60, the lead wires 68a and 68b are The positioning rib 13b protects against arc gas.
[0041]
A cover 1b is attached to the body 1a in a state where the contact mechanism 2 and the electromagnet device 3 are incorporated in the body 1a. Here, the cover 1b is attached to the inside of the rising edge 28 of the body 1a, the fitting protrusion 32 of the cover 1b is fitted into the fitting notch 16 of the body 1a, and the fitting protrusion 32a is fitted into the fitting groove 16a. By combining, it is possible to prevent the cover 1b from warping. In addition, since the peripheral edge of the cover 1b contacts the pressing protrusion 18 provided on the body 1a, the positioning of the cover 1b with respect to the body 1a is reliably performed. Further, in the upper part of the body 1a and the cover 1b, the yoke 48 holding the permanent magnet 49 in a state where the insertion protrusion 37 is inserted into the insertion groove 26 and the body 1a and the cover 1b are coupled to the body 1a. Since it is inserted into the insertion holes 27a and 36a from the front and the back with the cover 1b, the body 1a and the cover 1b are coupled also at the upper part of the body 1. As described above, the cover 1b is assembled to the body 1a, and the body 1a and the cover 1b are temporarily joined in a state where the yoke 48 is attached to the body 1a and the cover 1b.
[0042]
In this state, a liquid sealing material is injected into the eight injection holes 39 described above. Since the sealing material flows to the receiving surface 29 formed on the body 1a, the body 1a and the cover 1b are sealed by the curing of the sealing material. Here, a fixed terminal plate 40 is mounted on the upper part of the container body 1, and the fixed terminal plate 40 easily vibrates due to an impact when the movable contact 2 b comes into contact with the fixed contact 2 a. Noise can be reduced by increasing the strength. Therefore, by arranging four injection holes 39 in the upper part of the container 1, the sealing material can be sufficiently poured between the fixed terminal plate 40 and the body 1 a. However, if the insertion groove 26 is left as a space, a large amount of sealing material is required. Therefore, by inserting the insertion protrusion 37 into the insertion groove 26, the space through which the sealing material flows is reduced, and the fixed terminal plate While sealing material sufficient to fix 40 is injected, it is configured to prevent an unnecessary number of seals from being injected.
[0043]
By the way, in the above-described configuration, the facing surface between the guide tube 64b and the movable iron core 61 provided on the upper yoke 64 is substantially planar, but a protrusion is provided on one of the facing surfaces of the guide tube 64b and the movable iron core 61. It is also possible to adopt a configuration in which a concave portion into which the protrusion can be inserted is provided on the other side. For example, as shown in FIG. 29, a curved portion on the lower surface of the guide tube 64b may be used as a protrusion, and a recess 61e that matches this shape may be provided in the movable iron core 61. It is desirable to incline the protrusion so that the diameter is smaller toward the tip side, and similarly, the inner side surface of the recess is inclined to be smaller in diameter toward the bottom side. By adopting such a configuration, the facing area between the guide cylinder 64b and the movable iron core 61 can be increased, and the attractive force to the movable iron core 61 when the coil 60 is excited increases, so the contact mechanism 2 is closed. The moving voltage, which is the voltage applied to the coil 60 required for making the polarity, can be lowered.
[0044]
【The invention's effect】
  Invention of Claim 1According to this configuration, since the body and the cover are coupled at a plurality of locations, the alignment between the body and the cover is facilitated and the assemblability is improved. In addition, since the body and the cover are sandwiched between the two yokes, the body and the cover can be positioned so as not to be separated.
  According to the configuration of the invention of claim 2,Since at least one of the ride cylinder and the movable iron core is coated with a material that reduces friction and provides reciprocity, the movable iron core can be moved smoothly relative to the slide cylinder, and the coil can be excited to move. When the excitation of the coil is released after the iron core is attracted to the yoke at the other end of the coil, the movable iron core can be easily separated from the yoke by the spring force of the return spring. Since this function is realized only by coating at least one of the slide cylinder and the movable iron core without providing a separate member, the number of parts is not increased and the assembling work is easy.
[0045]
  Claim 3InventionAccording to the configuration ofSince the ride cylinder is continuously integrated with the yoke, the number of parts is reduced and the assemblability is improved as compared with the case where the slide cylinder is formed separately and coupled to the yoke.
[0046]
  Claim 4InventionAccording to the configuration ofSince the tip surface of the guide tube formed integrally with the core faces one surface of the movable core, the tip surface of the guide tube functions as a magnetic pole surface facing the movable core, and the facing area between the movable core and the yoke is large. In addition, the distance between the magnetic pole surface and the movable iron core is reduced, and a large attractive force can be applied to the movable iron core when the coil is excited. In addition, since the guide tube is continuously formed integrally with the yoke, the number of parts is reduced and the assemblability is improved as compared with the case where a separately formed guide tube is coupled to the yoke.
[0047]
  Claim 5InventionAccording to the configurationThe facing area between the inner cylinder and the movable iron core can be further increased, and the attractive force acting on the movable iron core when the coil is excited can be further increased.
[0048]
  Claim 6InventionAccording to the configurationSince the contact holder that joins the moving contact and the movable iron core is formed of one component of a synthetic resin molded product, the contact holder can be formed at low cost.
[0049]
  Claim 7InventionAccording to the configuration ofBy adjusting the thickness dimension of the pacer, the distance between the opposing surfaces of the guide cylinder and the movable iron core can be adjusted, and the overtravel amount and the moving voltage of the movable contact can be adjusted by the thickness of the spacer.
[0050]
  Claim 8InventionAccording to the configurationSince the contact holder is provided with a guide that is in sliding contact with the inner peripheral surface of the inner cylinder, one end in the moving direction of the movable member composed of the movable iron core and the contact holder is supported by the slide cylinder, and the other end is supported by the guide. Therefore, the movable member is supported at two points relatively distant from each other, and rattling of the operating member is prevented.
[0051]
  Claim 9InventionAccording to the configuration ofAn assembly hole is formed on one surface of the rudder part so that the contact pressure spring can be inserted into the holder part, and the inclined surface is provided on the spring receiving projection inserted into one end of the contact pressure spring. The work of attaching to the holder part becomes easy.
[0052]
  Claim 10InventionAccording to the configuration ofSince the terminal screw can be held by caulking part of the constant terminal plate, it is possible to prevent the terminal screw from rattling, and the terminal screw rattling when the contact mechanism is opened and closed. Can be prevented.
[0053]
  Claim 11InventionAccording to the configuration ofEven if the nut is loosened, the terminal screw is received by the shoulder portion so that the terminal screw does not fall off from the body, and the terminal screw does not rotate when the nut is tightened.
[Brief description of the drawings]
FIG. 1 is a partially cutaway front view with a cover removed in an embodiment of the present invention.
FIG. 2 is a longitudinal sectional view of the same.
FIG. 3 is a front view of the same.
FIG. 4 is a plan view of the same.
FIG. 5 is a side view of the above.
FIG. 6 is a bottom view of the above.
FIG. 7 is a front view of the body used in the above.
FIG. 8 is a rear view of the body used in the above.
FIG. 9 is a plan view of the body used in the above.
FIG. 10 is a bottom view of the body used in the above.
11 is a cross-sectional view taken along line AA in FIG.
12 is a cross-sectional view taken along the line BB in FIG.
13 is a cross-sectional view taken along the line CC in FIG.
FIG. 14 is a front view of a cover used for the above.
FIG. 15 is a rear view of the cover used in the above.
FIG. 16 is a bottom view of the cover used in the above.
FIG. 17 is a side view of the cover used in the above.
FIG. 18 is a cross-sectional view taken along line AA in FIG.
FIG. 19 is a cross-sectional view of a main part of the cover used in the above.
FIG. 20 is a front view of a contact holder used in the above.
FIG. 21 is a longitudinal sectional view of a contact holder used in the above.
FIG. 22 is a horizontal sectional view of a holder portion of the contact holder used in the above.
FIG. 23 is a plan view of a lower yoke used for the above.
FIG. 24 is a longitudinal sectional view of a lower yoke used in the above.
FIG. 25 is a transverse sectional view of a lower yoke used in the above.
FIG. 26 is a cross-sectional view of the lower yoke used in the above.
FIG. 27 is a plan view of an upper yoke used in the above.
FIG. 28 is a longitudinal sectional view of an upper yoke used in the above.
FIG. 29 is a cross-sectional view of a principal part showing another configuration example of the above.
[Explanation of symbols]
1 body
1a body
1b cover
2 Contact mechanism
2a Fixed contact
2b Movable contact
3 Electromagnet device
16 Mating notch
16a Alignment groove
16b
18 Pressing protrusion
21 shoulder
23a insertion hole
28 Rising edge
29 Reception surface
32 Mating protrusion
32a Alignment protrusion
32b receiving piece
36a insertion hole
40 Fixed terminal board
41 Movable contact
43 Terminal screw
45 nut
46 Cut part
47 Contact spring
48 York
49 Permanent magnet
50 Contact holder
51 Holder part
51b Assembly hole
51c Spring receiving projection
51d inclined surface
52a guide
55 Locking part
56 Connecting shaft
60 coils
61 Movable iron core
61e recess
63 Lower yoke
63b Slide cylinder
64 Upper yoke
64b guide tube
65 nuts
66 Return spring
69 Spacer

Claims

A contact mechanism for opening and closing an electrical path, an electromagnet device for opening and closing the contact mechanism, a contact device and a vessel for housing the contact mechanism and the electromagnet apparatus, vessel body, an edge rising on one side open opening edge And a cover that is covered with the body in contact with a receiving surface that is stepped down on the inner side of the rising edge of the body. A pair of permanent magnets arranged in contact with the outer surface of the cover side and acting on a magnetic field in the extending direction on the arc, and the body and cover in a form in which each permanent magnet is held in one piece and the other piece is overlapped And an L-shaped yoke that is press-fitted into an insertion hole that extends through the body, and a fitting notch is formed on one peripheral wall adjacent to the surface on which the rising edge is formed in the body, and the periphery of the fitting notch Part of the body A mating groove that is open on the inner surface is formed, and a receiving step whose outer surface side is wider than the inner surface side is formed in the remaining part of the periphery of the fitting notch, and the cover fits into the mating groove. A fitting protrusion is provided that includes a fitting protrusion and a receiving piece that matches the receiving step and is fitted into the fitting notch, and a cover is provided at the rising edge of the peripheral wall adjacent to the peripheral wall provided with the fitting notch in the body. A contact device characterized in that a plurality of pressing projections for locking the projection are provided .

The electric magnet arrangement, a coil and a yoke and a slide cylinder which is magnetically coupled to the yoke is inserted into one end of the coil, the movable armature in the axial direction of the coil is inserted into the slide cylindrical surrounding the coil, the yoke A return spring that urges the coil on the other end side of the coil and the movable iron core in a direction to separate them when the coil is not energized, and reduces friction during movement to at least one of the slide cylinder and the movable iron core. The contact device according to claim 1, wherein a material imparting properties is coated .

The electric magnet arrangement, a coil and a yoke and a slide cylinder which is magnetically coupled to the yoke is inserted into one end of the coil, the movable armature in the axial direction of the coil is inserted into the slide cylindrical surrounding the coil, the yoke A return spring that urges a portion on the other end side of the coil and the movable iron core in a direction in which the coil is separated when the coil is not energized, and the slide cylinder is formed integrally with the yoke. The contact device according to 1 .

The electromagnet device includes a coil, a yoke surrounding the coil, a slide cylinder inserted into one end of the coil and magnetically coupled to the yoke, a movable iron core inserted into the slide cylinder and movable in the axial direction of the coil, and a yoke A return spring that urges the coil on the other end side of the coil and the movable iron core in a direction in which the coil is separated when the coil is not energized; The contact device according to claim 1, wherein the contact device is formed integrally and has a front end surface of the guide cylinder facing one surface of the movable iron core .

Protruding part with a smaller diameter toward the tip side is provided on one of the opposed surfaces of the guide cylinder and the movable iron core, and a concave part with a decreasing diameter toward the bottom side is provided on the other side so that the protruding part can be inserted The contact device according to claim 4, characterized in that:

The contact mechanism includes a pair of fixed terminal plates each having a fixed contact fixed thereto, and a movable contact having a pair of movable contacts attached to and detached from each fixed contact at both ends, and holds an intermediate portion of the movable contact. The electromagnet device and the contact via a contact holder of a synthetic resin molded article having a holder shaft at one end and a connecting shaft fixed at the other end in a form inserted through the movable core 6. The contact device according to claim 1, wherein the contact device is coupled to the mechanism .

A latching portion is formed in the middle part of the contact holder so as to face the surface of the coil on the other end side of the movable iron core, and a spacer is interposed between the movable iron core and the latching portion. The contact device according to claim 6, wherein the movable iron core and the spacer are sandwiched between a nut and a locking portion that are screwed to a tip portion of the shaft portion .

The contact mechanism includes a pair of fixed terminal plates each having a fixed contact fixed thereto, and a movable contact having a pair of movable contacts attached to and detached from each fixed contact at both ends, and holds an intermediate portion of the movable contact. The electromagnet device and the contact mechanism are provided through a contact holder of a synthetic resin molded product having a holder shaft at one end and a connecting shaft fixed at the other end while being inserted into the movable iron core. coupled, characterized in that the intermediate part of the contact holder is the sliding contact guide on the inner peripheral surface of the guide tube to be a when inserted into the guide cylinder is formed on the peripheral surface of the contact holder according to claim 4. The contact device according to 4 .

A contact pressure spring that applies a contact pressure of the movable contact to the fixed contact is held in the holder portion together with an intermediate portion of the movable contact. The contact pressure spring is a coil spring, and the contact pressure spring is attached to the holder portion. An assembly hole to be opened opens on one surface of the holder portion, and a spring receiving projection is formed inside the holder portion to be inserted into one end of the contact pressure spring. The tip end surface of the spring receiving projection protrudes toward the assembly hole side. The contact device according to any one of claims 6 to 8, wherein an inclined surface for reducing the amount is formed .

The contact mechanism includes a fixed terminal plate having a fixed contact fixed and one end projecting to the outside of the device body, and a terminal screw having a nut screwed is inserted into a portion of the fixed terminal plate projecting to the exterior of the device body. In addition, a cut portion that is thin enough to allow caulking so that a part of the periphery of the through hole through which the terminal screw is inserted is closely attached to the terminal screw is formed on the side portion in the vicinity of the terminal screw. The contact device according to claim 1 .

The contact mechanism includes a fixed terminal plate having a fixed contact fixed and one end projecting to the outside of the device body, and a terminal screw having a nut screwed is inserted into a portion of the fixed terminal plate projecting to the exterior of the device body. The terminal screw is in contact with the head of the terminal screw on the outer surface of the container and near the head of the terminal screw to prevent the terminal screw from rotating. The contact device according to claim 1, wherein a shoulder portion for preventing the drop-off is formed .