JP3803646B2

JP3803646B2 - Electromagnetic actuator

Info

Publication number: JP3803646B2
Application number: JP2003084859A
Authority: JP
Inventors: 裕純金
Original assignee: Keihin Corp
Current assignee: Keihin Corp
Priority date: 2003-03-26
Filing date: 2003-03-26
Publication date: 2006-08-02
Anticipated expiration: 2023-03-26
Also published as: JP2004297870A

Description

【０００１】
【発明の属する技術分野】
本発明は，磁性体からなるハウジングの底壁に支持される固定コアと，この固定コアにエアギャップを介して対置されて可動部材を駆動する可動コアと，これら固定及び可動コアを囲繞して前記ハウジングに支持されるボビンにコイルを巻装してなるコイル組立体とを備える電磁式アクチュエータの改良に関する。
【０００２】
【従来の技術】
かゝる電磁式アクチュエータは，例えば下記特許文献１に開示されているように，既に知られている。
【０００３】
【特許文献１】
特開２００１−１７６５号公報
【０００４】
【発明が解決しようとする課題】
従来のかゝる電磁式アクチュエータでは，ハウジングに収容されるコイル組立体にコイルの封止手段が施されていないため，防水性が良好とは言えず，またコイルに接続したリード線をハウジング外に引き出して，これにカプラの端子に接続していたので，そのカプラを保持するカプラホルダをハウジング若しくはそれに隣接する部材に設ける必要があり，部品点数及び組立工数が多く，コストの低減が困難であった。
【０００５】
本発明は，かゝる事情に鑑みてなされたもので，コイル組立体にコイルの封止手段を施して，コイルの防水性が高く，しかも，その封止手段とカプラの一体化により部品点数及び組立工数の削減を可能にして，安価な電磁式アクチュエータを提供することを目的とする。
【０００６】
【課題を解決するための手段】
上記目的を達成するために，本発明は，磁性体からなるハウジングの底壁に支持される固定コアと，この固定コアにエアギャップを介して対置されて可動部材を駆動する可動コアと，これら固定及び可動コアを囲繞して前記ハウジングに支持されるボビンにコイルを巻装してなるコイル組立体とを備える電磁式アクチュエータにおいて，前記ボビンの一端面に，カプラ端子の基端部をインサート結合する小支柱を一体に形成し，この小支柱に巻き付けた，前記コイルの引き出し線を前記カプラ端子に接続し，前記コイルを前記ボビンに封止するように該コイル及びボビンの外周に成形されるコイルカバーに，前記カプラ端子を保持して前記コイル組立体の半径方向外方に突出するカプラと，前記小支柱を包み込んで前記コイルカバーの端面から突出する突出部とを継ぎ目無く一体に形成し，前記カプラを，前記ハウジングの周壁から底壁にかけて設けられた開口部を通して外部に露出させると共に，前記突出部を前記底壁に隣接させるように該開口部内に配置したことを特徴とする。
【０００７】
この第１の特徴によれば，コイルをボビンに封止するようにコイル及びボビンの外周にコイルカバーを成形したことで，コイルの防水性を高めることができる。
【０００８】
しかもコイルカバーには，カプラ端子を保持して半径方向外方へ突出するカプラを一体に形成したので，コイルに接続するリード線もカプラを支持するカプラホルダも不要となり，部品点数及び組立工数が削減され，コストの低減を図ることができる。
【０００９】
またボビンの一端面には，カプラ端子の基端部をインサート結合する小支柱を一体に形成し，この小支柱に巻き付けた，コイルの引き出し線をカプラ端子に接続し，小支柱を包み込んでコイルカバーの端面から突出する突出部をカプラと共にコイルカバーに一体に形成したので，コイルの引き出し線の小支柱への巻き付けにより，該引き出し線の弛みを確実に防ぎつゝ，コイルカバー，カプラ及び突出部の成形を行うことができる。
【００１１】
更にカプラを，ハウジング周壁から底壁にかけて設けられた開口部を通して外部に露出させると共に，突出部を底壁に隣接させるように該開口部内に配置したことにより，突出部の収容スペースをハウジングに設ける必要もなく，また突出部がハウジング外面の張り出すこともなく，アクチュエータをコンパクトに構成することができる。
【００１２】
【発明の実施の形態】
本発明の実施の形態を，添付図面に示す本発明の好適な実施例に基づいて以下に説明する。
【００１３】
図１は本発明の電磁式アクチュエータを備える能動型防振支持装置の縦断面図，図２は図１の２−２線断面図，図３は図１の３−３線断面図，図４は図１の４部拡大図，図５は図４の５矢視図，図６は図４の６矢視図，図７は図４中の調節ナットの斜視図，図８は同調節ナット，連結ボルト及びロックスクリューの分解一部縦断側面図である。
【００１４】
先ず，図１において，本発明の電磁式アクチュエータ３１を備える能動型防振支持装置Ｍは，自動車においてエンジンＥを車体フレームＦに弾性的に支持すべく，それらの間に介装される。
【００１５】
能動型防振支持装置Ｍは，軸線Ｌに関して実質的に軸対称な構造を有するもので，エンジンＥに結合される板状の取り付けブラケット１１と，この取り付けブラケット１１に溶接される内筒１２と，この内筒１２の外周に同軸に配置される外筒１３と，これら内筒１２及び外筒１３の相対向する円錐面に加硫接着される厚肉のゴム等からなる第１弾性体１４とを備えており，この第１弾性体１４の下方には，互いに上下に並んで一体化された第１オリフィス形成部材１５，第２オリフィス形成部材１６及び第３オリフィス形成部材１７が配置される。
【００１６】
第１オリフィス形成部材１５は円板状をなしていて，その中央に開口部１５ｂを有する。第２オリフィス形成部材１６は，上面を開放した樋状断面を有して環状をなしていて，その開放上面が第１オリフィス形成部材１５で閉鎖されるように，第１オリフィス形成部材１５に一体に接合される。また第３オリフィス形成部材１７も，上面を開放した樋状断面を有して環状をなしていて，その開放上面が第２オリフィス形成部材１６で閉鎖されるように，第２オリフィス形成部材１６に一体に接合される。第１及び第２オリフィス形成部材１５，１６の外周部は互いに重ねられて一体化され，前記外筒１３の下部に連設された環状のかしめ固定部１３ａに固定される。
【００１７】
第３オリフィス形成部材１７の内周面には，ゴム等からなる環状の第２弾性体１８の外周面が加硫接着され，この第２弾性体１８の内周面に，軸線Ｌ上に配置されて下面を開放した第１キャップ部材１９が加硫接着される。この第１キャップ部材１９には，第２キャップ部材２３及び可動部材２０が順次圧入により固着される。第２キャップ部材２３は，その下端部を第１キャップ部材１９の下方へ突出させており，この突出部の外周面に，第２弾性体１８の下方に配置されるダイヤフラム２２の内周端部が加硫接着される。このダイヤフラム２２の外周にはリング部材２１が加硫接着されており，このリング部材２１は前記かしめ固定部１３ａに，前記第１及び第２オリフィス形成部材１５，１６の外周部と共に固定される。上記第２弾性体１８及びダイヤフラム２２の撓みにより可動部材２０は第１及び第２キャップ部材１９，２３と共に上下動が可能である。
【００１８】
而して，第１弾性体１４及び第２弾性体１８間には，液体を封入される第１液室２４が画成され，また第２弾性体１８及びダイヤフラム２２間には，同じく液体を封入される第２液室２５が画成される。これら第１及び第２液室２４，２５は，第１〜第３オリフィス形成部材１５〜１７により形成される上部オリフィス２６及び下部オリフィス２７を介して相互に連通される。
【００１９】
上部オリフィス２６は，第１及び第２オリフィス形成部材１５，１６間にその一周弱に亙り画成されるもので（図２参照），この上部オリフィス２６の両端壁を構成する隔壁２６ａが第１及び第２オリフィス形成部材１５，１６間に溶接される。そして上部オリフィス２６は，隔壁２６ａの一側で第１オリフィス形成部材１５の通孔１５ａを介して第１液室２４に連通され，また隔壁２６ａの他側で第２オリフィス形成部材１６の通孔１６ａを介して下部オリフィス２７に連通される。
【００２０】
下部オリフィス２７は，第２及び第３オリフィス形成部材１６，１７間にその一周弱に亙り画成されるもので（図３参照），この下部オリフィス２７の両端壁を構成する隔壁２７ａが第１及び第２オリフィス形成部材１５，１６間に溶接される。そして上部オリフィス２６は，隔壁２７ａの一側で前記通孔１６ａを介して上部オリフィス２６に連通され，また隔壁２７ａの他側で第３オリフィス形成部材１７の通孔１７ａを介して第２液室２５に連通される。以上により，第１及び第２液室２４，２５間は，互いに直列に接続された上部及び下部オリフィス２６，２７を介して連通される。
【００２１】
前記かしめ固定部１３ａには，さらに，筒状ブラケット２８が固定され，これを車体フレームＦに固着することにより，能動型防振支持装置Ｍは車体フレームＦに取り付けられる。この筒状ブラケット２８及び前記外筒１３により能動型防振支持装置Ｍの支持ケーシングＣが構成される。
【００２２】
上記筒状ブラケット２８にはアクチュエータ支持部材３０が固着され，前記可動部材２０を駆動する電磁式アクチュエータ３１がこのアクチュエータ支持部材３０により支持される。
【００２３】
図４において，アクチュエータ３１は，上面を開放した磁性体からなる有底円筒状のハウジング３２を備え，その上端に形成されたフランジ３２ａがアクチュエータ支持部材３０に固着される。ハウジング３２は磁性体であって，その内部内には，固定コア３３，コイル組立体３４及び上部ヨーク３５が順次取り付けられる。固定コア３３は，その上部に吸引面３３ａを持ち，下面に位置決め軸３３ｂを突出させ，また外周に段付き鍔状の下部ヨーク３６を形成しており，その下部ヨーク３６をハウジング３２の底壁３２ｂに密着させて，位置決め軸３３ｂが該底壁３２ｂの位置決め孔３７に圧入される。こうして固定コア３３はハウジング３２に固着される。
【００２４】
コイル組立体３４は，固定コア３３の外周に配置される合成樹脂製のボビン３８と，このボビン３８に巻装されるコイル３９とを備える。そのボビン３８の下部フランジの外周には下方に突出する小支柱３８ａが突設され，この小支柱３８ａの成形時，これにカプラ端子４０の基端部がインサート結合される。小支柱３８ａには，コイル３９の引き出し線３９ａが巻き付けられ，その先端がカプラ端子４０に半田付けや電気溶接等により接続される。
【００２５】
引き出し線３９ａのカプラ端子４０への接続後，上記コイル３９をボビン３８に封止すべく，ボビン３８の上下両端面からコイル３９の外周面にかけて密着する円筒状のコイルカバー４１が合成樹脂により射出成形される。その際，このコイルカバー４１には，前記カプラ端子４０を保持して該カバー４１の半径方向外方に突出するカプラ４２と，前記小支柱３８ａ引き出し線３９ａを包んで該カバー４１の下端面に突出する突出部４２ａとが一体に形成される。このカプラ４２は，ハウジング３２の底壁３２ｂから周壁にかけて設けられた開口部４３を通してハウジング３２外に露出するように配置され（図５及び図６参照），また前記突出部４２ａは，ハウジング３２の底壁３２ｂに隣接するように開口部４３内に配置される。
【００２６】
コイル組立体３４の上端面，特にコイルカバー４１の上端面には環状のシール部材４５が装着される。またコイル組立体３４の下端面，特にボビン３８及びコイルカバー４１の下端面には，固定コア３３を囲繞して同心状に並ぶ複数のシール凸条４６，４６が一体に形成され，その下端面と，前記下部ヨーク３６の薄肉外周部３６ａとの間に弾性板４７が介装される。この弾性板４７は，ＮＢＲやシリコンゴム等の弾性材料で成形される。
【００２７】
前記上部ヨーク３５は，コイル組立体３４を下部ヨーク３６に向かって押圧，保持すべくハウジング３２の内周面に圧入により固着される。これに伴ない前記シール部材４１及び弾性板４７が圧縮されることで，コイル組立体３４は上部ヨーク３５及び下部ヨーク３６間で弾性的にガタ無く支持され，コイル組立体３４の耐震性及びコイル３９の防水性が向上する。特に，ボビン３８及びコイルカバー４１の下端面のシール凸条４６，４６は弾性板４７の上面に食い込んで弾性板４７との間のシールをより確実にするので，万一，外部から開口部４３に浸入した雨水や洗浄水等がハウジング３２の底部に溜まった場合，コイルカバー４１とコイル３９及びボビン３８との密着不良があっても，コイル３９側への浸水は勿論，ボビン３８の内周側への浸水をも確実に防ぐことができる。
【００２８】
上部ヨーク３５の，ボビン３８内周に配置される円筒部３５ａの内周面には薄肉円筒状の軸受部材５０が摺動可能に嵌合される。この軸受部材５０の上端には半径方向内方に向く内向きフランジ５０ａが，またその下端には半径方向外方を向き外向き外向きフランジ５０ｂがそれぞれ一体に形成されており，その外向きフランジ５０ｂは，環状の弾性板５１を介して下部ヨーク３６の厚肉内周部３６ｂに重ねられ，この外向きフランジ５０ｂ及び固定コア３３との間に，コイルばねからなるセットばね５２が縮設され，これによって軸受部材５０は下部ヨーク３６上に弾性的に保持され，その防振が図られる。
【００２９】
また上記弾性板５１は，可動コア５３の固定コア３３側への下降時，両コア３３，５３の衝合を回避すべく可動コア５３の下端を緩衝的に受け止めて，その下降限を規定する，可動コア５３の下降ストッパを兼ねている。
【００３０】
上記軸受部材５０には，固定コア３３の吸引面３３ａにエアギャップｇを介して対向させる吸引面５３ａを持った可動コア５３が摺動自在に嵌装されており，この可動コア５３の中心部に開口する比較的大径の透孔５４を緩く貫通する連結ボルト５５の上端が前記可動部材２０に螺着され，該連結ボルト５５の下端部には，可動コア５３の，透孔５４周囲の下端面を支承する調節ナット５６が螺合され，その際，可動コア５３を該調節ナット５６による支承位置に保持するセットばね５７が可動部材２０及び可動コア５３間に縮設される。こうして可動コア５３は，可動部材２０と一体化した連結ボルト５５に螺合される調節ナット５６と，セットばね５７とで弾性的に挟持される。調節ナット５６の，可動コア５３に圧接する上端面には，前記透孔５４に連通する半径方向の通気溝５８が形成されていて，可動コア５３の昇降時，その上下の空間での空気の流通をスムーズに行わせるようになっている。
【００３１】
而して，連結ボルト５５に対する調節ナット５６の螺合位置を進退させれば，セットばね５７との協働により，可動コア５３の上下位置，即ち可動コア５３及び固定コア３３の吸引面３３ａ，５３ａ間のエアギャップｇを調節することができる。調節ナット５６の調節位置は，調節ナット５６に下方から螺合，緊締されてロックスクリュー５９により固定される。
【００３２】
図７及び図８に示すように，連結ボルト５５のねじ部は通常の右ねじになっているのに対して，ロックスクリュー５９のねじ部は左ねじが形成されており，したがって調節ナット５６を工具により所定の調節位置に保持した状態で，別の工具によりロックスクリュー５９を締め込めば，ロックスクリュー５９のトルクが摩擦により連結ボルト５５に伝達し，連結ボルト５５をロックスクリュー５９側に引き込むようになるため，調節ナット５６の調節位置でのロックを確実に行うことができる。
【００３３】
固定コア３３の中心部には，調節ナット５６の出入りを可能にする調節作業孔６０が設けられ，この調節作業孔６０に挿入される工具により上記ロックスクリュー５９や調節ナット５６を操作し得るようになっている。この調節作業孔６０は，ねじ孔６０ａと，このねじ孔６０ａの下端に環状の肩部６０ｂを介して連なる，ねじ孔６０ａより大径の嵌合孔６０ｃとからなっている。一方，この調節作業孔６０を閉鎖する栓体６１は上端を開放した有底円筒形をなすもので，調節ナット５６を受け入れながらねじ孔６０ａに螺合されるねじ筒６１ａと，嵌合孔６０ｃに嵌合される鍔部６１ｂと，底部６１ｃとを有しており，その鍔部６１ｂの外周に，嵌合孔６０ｃの内周面に密接するシール部材６４が装着される。底部６１ｃの下面には多角形の工具係合用突起６２が形成されている。
【００３４】
而して，嵌合孔６０ｃに嵌合した鍔部６１ｂが肩部６０ｂに当接するまで，ねじ筒６１ａをねじ孔６０ａに螺合，緊締することにより，栓体６１により調節作業孔６０を水密に閉鎖することができる。
【００３５】
この栓体６１の底部６１ｃ上面には弾性板６３が接合され，この弾性板６３を介して該底部６１ｃが調節ナット５６の下端を緩衝的に受け止めて可動部材２０の下降限を規定するようになっている。但し，調節ナット５６が栓体６１の底部６１ｃに当接するときは，可動部材２０の下降により可動コア５３が前述の下降限に達した後，可動部材２０がセットばね５７を圧縮しながら更に下降した場合である。
【００３６】
前記軸受部材５０内において，固定コア３３及び可動コア５３の相対向する吸引面３３ａ，５３ａは，その間に円錐筒状のエアギャップｇを画成するように，何れも円錐面に形成されて，可動コア５３の吸引面５３ａが固定コア３３の吸引面３３ａを囲繞するように配置される。これによって軸受部材５０内の比較的小径の固定コア３３及び可動コア５３においても，比較的大なる吸引力と，可動コア５３の比較的長いストロークを得ることができる。
【００３７】
しかも可動コア５３の吸引面５３ａは，該コア５３の内周面側に形成されることになるから，可動コア５３の，軸受部材５０による支持スパンを，その吸引面５３ａに関係なく充分長く確保し得，可動コア５３の安定した昇降を保証することができる。この場合，可動コア５３の外周面にテフロン等の低摩擦材層を形成することは，可動コア５３のより安定したスムーズな昇降を得る上で有効である。
【００３８】
上記セットばね５７はコイルばねからなるもので，連結ボルト５５の基部の大径部５５ａに嵌合することで，連結ボルト５５と同心に配置される。またこのセットばね５７と可動コア５３との間には，可動コア５３の摩耗を防ぐべく鋼板製で環状のばね座６５が介装される。このばね座６５は，その内周縁部及び外周縁部からセットばね５７の内周面及び外周面に沿って起立する内外同心の位置決め筒部６６，６７を有しており，外側の位置決め筒部６７は，内側の位置決め筒部６６より長く形成される。これら位置決め筒部６６，６７間へのセットばね５７の挿入を容易にすべく，位置決め筒部６６，６７の上端部にファンネル部６６ａ，６７ａが形成される。またこのばね座６５及び可動コア５３の相対向する当接面の少なくとも一方には，テフロン等の低摩擦材層が形成され，ばね座６５の可動コア５３に対する摺動性が良好にしてある。
【００３９】
再び図１において，アクチュエータ３１のコイル３９には，カプラ４２を介して電子制御ユニットＵが接続され，この電子制御ユニットＵには，エンジン回転数を検出する回転数センサＳａ，能動型防振支持装置Ｍに入力される荷重を検出する荷重センサＳｂ，並びにエンジンＥに作用する加速度を検出する加速度センサＳｃの各検出信号が入力される。
【００４０】
次に，この実施例の作用について説明する。
【００４１】
能動型防振支持装置Ｍのアクチュエータ３１が非作動状態にあるときは，上部及び下部オリフィス２６，２７を介して相互に連通する第１及び第２液室２４，２５は同圧力に保たれるが，可動部材２０に結合した第１キャップ部材１９の第１液室２４での受圧面積は，第２液室２５での受圧面積より大であるから，その面積差に第１液室２４の圧力を乗じた下向きの荷重が可動部材２０に作用し，その荷重と，それに対する第２弾性体１８の反発力とが釣り合ったところで，可動部材２０が停止していて，固定コア３３及び可動コア５３の吸着面３３ａ，５３ａ間に所定の初期エアギャップｇを形成している。
【００４２】
而して，自動車の走行中，エンジンＥに低周波数のシェーク振動が発生したとき，エンジンＥから入力される荷重で第１弾性体１４が変形して第１液室２４の容積が変化すると，上部及び下部オリフィス２６，２７を介して相互に連通した第１及び第２液室２４，２５間で液体の行き来が生ずる。第１液室２４の容積が拡大，縮小すると，それに応じて第２液室２５の容積が縮小，拡大するが，この第２液室２５の容積変化はダイヤフラム２２の弾性変形により吸収される。このとき，上部及び下部オリフィス２６，２７の形状及び寸法，並びに第１弾性体１４のばね定数は，前記シェーク振動の周波数領域で高ばね定数及び高減衰力を示すように設定されているため，エンジンＥから車体フレームＦに伝達される振動を効果的に低減することができる。
【００４３】
このようなエンジンＥの低周波数のシェーク振動域では，アクチュエータ３１は非作動状態に保たれる。
【００４４】
エンジンＥが，上記シェーク振動よりも周波数の高い振動，即ちエンジンＥのアイドリンク時に発生するアイドル振動やこもり音振動が発生した場合，第１及び第２液室２４，２５間を接続する上部及び下部オリフィス２６，２７内の液体スティック状態になって防振機能を発揮し得なり，このようなときに，アクチュエータ３１を駆動して防振機能を発揮させるのである。
【００４５】
即ち，電子制御ユニットＵが，エンジン回転数センサＳａ，荷重センサＳｂ及び加速度センサＳｃ等から入力される検出信号に基づいてアクチュエータ３１のコイル３９への通電を制御する。具体的には，振動によってエンジンＥが下方に偏倚し，第１弾性体１４の下方への変形により第１液室２４の容積が減少して，その液圧が上昇するときには，コイル３９を励磁して，可動コア５３を固定コア３３側に吸引する。その結果，可動コア５３は第２弾性体１８を変形させつゝ下降して，第１液室２４の容積を拡大させることで，該室２４の圧力の上昇を抑制することができ，結局，能動型防振支持装置ＭはエンジンＥから車体フレームＦへの下向き荷重の伝達を防止する能動的な支持力を発生する。
【００４６】
上記と反対に，エンジンＥが上方に偏倚して第１液室２４の容積が拡大し，該室２４の圧力が上昇するときには，コイル３９を消磁して，可動コア５３を解放する。その結果，可動コア５３は第２弾性体１８の反発力により上昇して，第１液室２４の容積を縮小させることで，該室２４の圧力の低下を抑制することができ，結局，能動型防振支持装置ＭはエンジンＥから車体フレームＦへの上向き荷重の伝達を防止する能動的な支持力を発生する。
【００４７】
このような作動中，エンジンＥから第１弾性体１４への下向き荷重の過度な増大に伴ない，第１液室２４の圧力が急増し，可動部材２０に過度な下向き荷重が加わった場合には，可動部材２０は，先ず，可動コア５３をその下降限まで，即ち，該コア５３の下端面を下部ヨーク３６の厚肉内周部３６ｂ上の弾性板５１に当接させるまで下降させ，その後は，セットばね５７が圧縮変形して，調節ナット５６が可動コア５３の下面から離することにより，可動部材２０の固定コア３３側への更なる移動が許容される。したがって可動部材２０の過大な荷重をセットばね５７に吸収させて，固定コア３３及び可動コア５３相互の接触と，可動コア５３及び弾性板５１への過負荷の作用とを防ぎ，それらの耐久性を確保することができる。
【００４８】
そして，もし，可動コア５３が下降限に達した後，可動部材２０の下降が所定量に達すると，調節ナット５６が固定コア３３に固着された栓体６１の底部６１ｃに弾性板６３を介して当接し，セットばね５７の過度の荷重増加を抑え，固定コア３３及び可動コア５３に対する過負荷の増加を防ぐことができる。
【００４９】
ところで，アクチュエータ３１の非作動状態における固定コア３３及び可動コア３３，５３の吸引面３３ａ，５３ａ間の初期エアギャップｇは，能動型防振支持装置Ｍにおける可動部材２０の推力及び変位に関する特性を左右するものであるが，第２弾性体１８の取り付け部から可動コア５３に至る各部の集積製作誤差により，該初期エアギャップｇが許容範囲に収まっていないことがあるが，そのようなときには，前述のように，連結ボルト５５に対する調節ナット５６の螺合位置を進退させることにより，該初期エアギャップｇを適正に容易に調整することができる。したがって，コイル３９の励磁により，可動部材２０に所定の推力及び変位を高精度で付与することが可能となり，能動型防振支持装置Ｍの性能向上を図ることができる。
【００５０】
また調節ナット５６を操作して，固定コア３３及び可動コア３３，５３間の初期エアギャップｇの異なる複数種の能動型防振支持装置Ｍを用意すれば，複数の車種に対応した特性も持つ能動型防振支持装置Ｍを容易に得ることができ，コストの低減に寄与し得る。
【００５１】
しかも上記調節ナット５６は，ハウジング３２外に開口する固定コア３３の調節作業孔６０から行われるので，能動型防振支持装置Ｍの組立完了後，各部の組立誤差に関係なく，前記初期エアギャップｇを正確に行うことができる。
【００５２】
また固定コア３３は調節作業孔６０を有することで中空となるも，それと一体の位置決め軸３３ｂがハウジング３２の底壁３２ｂの位置決め孔３７に圧入され，またフランジ状の下部ヨーク３６が該底壁３２ｂに密着することにより，固定コア３３は強固に補強されることになり，可動コア５３から当接衝撃を受けても充分に耐えることができ，のみならず位置ずれを起こすことがない。しかも上記下部ヨーク３６は，ハウジング３２及び上部ヨーク３５と協働してコイル組立体３４周りの磁路を効果的に増加させるので，固定及び可動コア３３，５３間の吸引力の増大を図ることができる。
【００５３】
一方，可動コア５３の上昇限は，その上端が前記軸受部材５０の内向きフランジ５０ａに当接することにより規定される。可動コア５３が内向きフランジ５０ａに衝撃的に当接した場合には，その衝撃力は軸受部材５０及び外向きフランジ５０ｂを介してセットばね５２に伝達され，その弾性により吸収されるので，セットばね５２は，可動コア５３及び軸受部材５０を衝撃力から保護する衝撃吸収部材を兼ねることになる。
【００５４】
可動コア５３は，セットばね５７により調節ナット５６に弾性的に保持され，しかも可動コア５３の透孔５４内面と連結ボルト５５との間には充分な遊びが設けられているから，可動コア５３及び連結ボルト５５は相対的に首振り可能であり，したがって能動型防振支持装置Ｍの作動中，可動部材２０に傾き方向の荷重が加わったときでも，連結ボルト５５の首振りにより，可動コア５３の傾きを防いで軸受部材５０との良好な摺動関係を維持することができる。この場合，連結ボルト５５の首振りに伴ない，セットばね５７が多少とも横方向に移動するが，このセットばね５７と可動コア５３間には，セットばね５７の下端部を保持するばね座６５が介在しており，しかもばね座６５及び可動コア５３の当接面には低摩擦材層が形成されているので，セットばね５７に伴ないばね座６５が可動コア５３の上面をスムーズに滑ることになり，可動コア５３からの摩耗粉の発生を効果的に抑えることができる。したがって，その摩耗粉に起因したトラブル，例えばその摩耗粉が軸受部材５０及び可動コア５３の摺動部に侵入して可動コア５３の動きを阻害することを未然に防ぐことができる。
【００５５】
軸受部材５０は，その下端の外向きフランジ５０ｂと上部ヨーク３５との間にセットばね５２を縮設するという，極めて簡単な構造により下部ヨーク３６上の定位置に取り付けられるので，その取り付けには高精度を必要とせず，コストの低減を図ることができる。しかも上記セットばね５２は，軸受部材５０の外周側に配置されることになるから，このセットばね５２と，これが圧接する部分との間で摩耗粉が発生しても，その摩耗粉の軸受部材５０内への侵入を防ぐことができ，特に，外向きフランジ５０ｂと下部ヨーク３６間にはそれらに密着する弾性板５１が介在しているから，上記摩耗粉の軸受部材５０内への侵入を弾性板５１により確実に防ぐことができ，軸受部材５０は可動コア５３に対する良好なガイド性を長期に亙り発揮することができる。
【００５６】
また上記セットばね５２の反発力は，ハウジング３２に連なる上部ヨーク３５に支承され，可動コア５３には作用しないから，上記セットばね５２の反発力による固定及び可動コア３３，５３間の有効吸引力のロスを防ぎ，可動コア５３の出力性能を向上を図ることができる。
【００５７】
コイル組立体３４においては，コイル３９をボビン３８に封止するようにコイル３９及びボビン３８の外周面に密着するコイルカバー４１が成形されるので，コイル３９の防水性を高めることができる。しかもコイルカバー４１には，カプラ端子４０を保持して半径方向外方へ突出するカプラ４２を一体に形成したので，コイル３９に接続するリード線もカプラを支持するカプラホルダも不要となり，部品点数及び組立工数が削減され，コストの低減を図ることができる。
【００５８】
またボビン３８の一端面には，カプラ端子４０の基端部をインサート結合する小支柱３８ａが一体に形成され，この小支柱３８ａには，カプラ端子４０に接続される，コイル３９の引き出し線３９ａが巻き付けられ，その後，小支柱３８ａ及び引き出し線３９ａを包んでコイルカバー４１の下端面から突出する突出部４２ａがカプラ４２と共にコイルカバー４１に一体に形成されるので，コイル３９の引き出し線３９ａを小支柱３８ａに巻き付けることにより，引き出し線３９ａの弛みを確実に防ぎつゝ，コイルカバー４１，カプラ４２及び突出部４２ａの成形を行うことができる。
【００５９】
さらにカプラ４２を，ハウジング３２の周壁から底壁３２ｂにかけて設けられた開口部４３を通して外部に露出させるとき，前記突出部４２ａは，前記底壁３２ｂに隣接するように開口部４３に配置されるので，前記突出部４２ａの収容スペースをハウジング３２に設ける必要もなく，また突出部４２ａがハウジング３２外面の張り出すこともなく，これによりアクチュエータ３１のコンパクト化を図ることができる。
【００６０】
本発明は上記実施例に限定されるものではなく，その要旨を逸脱しない範囲で種々の設計変更が可能である。例えば，上記実施例では，可動部材２０及び連結ボルト５５は，それぞれ別体に構成したものを螺着して一体化したが，両者２０，５５を同一素材により一体に構成することもできる。また固定コア３３の位置決め軸３３ｂとハウジング３２の底壁３２ｂの位置決め孔３７との嵌合部を，圧入に代えて，溶接により固定することもできる。
【００６１】
【発明の効果】
以上のように本発明によれば，磁性体からなるハウジングの底壁に支持される固定コアと，この固定コアにエアギャップを介して対置されて可動部材を駆動する可動コアと，これら固定及び可動コアを囲繞して前記ハウジングに支持されるボビンにコイルを巻装してなるコイル組立体とを備える電磁式アクチュエータにおいて，前記ボビンの一端面に，カプラ端子の基端部をインサート結合する小支柱を一体に形成し，この小支柱に巻き付けた，前記コイルの引き出し線を前記カプラ端子に接続し，前記コイルを前記ボビンに封止するように該コイル及びボビンの外周に成形されるコイルカバーに，前記カプラ端子を保持して前記コイル組立体の半径方向外方に突出するカプラと，前記小支柱を包み込んで前記コイルカバーの端面から突出する突出部とを継ぎ目無く一体に形成したので，コイルをボビンに封止するように該コイル及びボビンの外周に成形されるコイルカバーにより，コイルの防水性を高めることができ，しかもコイルカバーとカプラの一体化により，コイルに接続するリード線もカプラを支持するカプラホルダも不要となり，部品点数及び組立工数が削減され，コストの低減を図ることができる。またコイルの引き出し線の小支柱への巻き付けにより，該引き出し線の弛みを確実に防ぎつゝ，コイルカバー，カプラ及び突出部の成形を行うことができる。
【００６２】
また特にカプラを，ハウジングの周壁から底壁にかけて設けられた開口部を通して外部に露出させると共に，突出部を底壁に隣接させるように該開口部内に配置したので，突出部の収容スペースをハウジングに設ける必要もなく，突出部がハウジング外面の張り出すこともなく，アクチュエータをコンパクトに構成することができる。
【図面の簡単な説明】
【図１】本発明の電磁式アクチュエータを備える能動型防振支持装置の縦断面図
【図２】図１の２−２線断面図
【図３】図１の３−３線断面図
【図４】図１の要部拡大図
【図５】図４の５矢視図
【図６】図４の６矢視図
【図７】図４中の調節ナットの斜視図
【図８】同調節ナット，連結ボルト及びロックスクリューの分解一部縦断側面図
【符号の説明】
ｇ・・・・・エアギャップ
２０・・・・可動部材
３１・・・・電磁式アクチュエータ
３２・・・・ハウジング
３２ｂ・・・底壁
３３・・・・固定コア
３４・・・・コイル組立体
３８・・・・ボビン
３８ａ・・・小支柱
３９・・・・コイル
３９ａ・・・引き出し線
４０・・・・カプラ端子
４１・・・・コイルカバー
４２・・・・カプラ
４２ａ・・・突出部
４３・・・・開口部
５３・・・・可動コア[0001]
BACKGROUND OF THE INVENTION
The present invention includes a fixed core supported by a bottom wall of a housing made of a magnetic material, a movable core that is opposed to the fixed core via an air gap and drives a movable member, and surrounds the fixed and movable core. The present invention relates to an improvement of an electromagnetic actuator including a coil assembly in which a coil is wound around a bobbin supported by the housing.
[0002]
[Prior art]
Such an electromagnetic actuator is already known as disclosed in, for example, Patent Document 1 below.
[0003]
[Patent Document 1]
JP 2001-1765 A
[0004]
[Problems to be solved by the invention]
In such conventional electromagnetic actuators, the coil assembly housed in the housing is not provided with a coil sealing means, so it cannot be said that the waterproof property is good, and the lead wire connected to the coil is outside the housing. Since it was pulled out and connected to the terminal of the coupler, it was necessary to provide a coupler holder for holding the coupler in the housing or the adjacent member, which required many parts and assembly steps, and it was difficult to reduce costs. .
[0005]
The present invention has been made in view of such circumstances. The coil assembly is provided with a coil sealing means so that the coil is highly waterproof, and the sealing means and the coupler are integrated to reduce the number of parts. An object is to provide an inexpensive electromagnetic actuator that can reduce the number of assembly steps.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a fixed core supported by a bottom wall of a housing made of a magnetic material, a movable core that is opposed to the fixed core via an air gap and drives a movable member, In an electromagnetic actuator comprising a coil assembly formed by winding a coil around a bobbin supported by the housing and surrounding a fixed and movable core, a base end portion of a coupler terminal is insert-coupled to one end surface of the bobbin A small strut is integrally formed, and the coil lead wire wound around the small strut is connected to the coupler terminal, and the coil and the bobbin are molded on the outer periphery so as to seal the coil to the bobbin. A coil cover that holds the coupler terminal and protrudes radially outward of the coil assembly, and a small column that wraps the end face of the coil cover. And a protrusion protruding Seamlessly Integrally formed The coupler is exposed to the outside through an opening provided from the peripheral wall to the bottom wall of the housing, and the protrusion is disposed in the opening so as to be adjacent to the bottom wall. That Special It is a sign.
[0007]
According to the first feature, since the coil cover is formed on the outer periphery of the coil and the bobbin so as to seal the coil to the bobbin, the waterproofness of the coil can be enhanced.
[0008]
In addition, the coil cover is integrally formed with a coupler that holds the coupler terminal and protrudes outward in the radial direction, eliminating the need for a lead wire connected to the coil and a coupler holder that supports the coupler, reducing the number of parts and the number of assembly steps. The cost can be reduced.
[0009]
Also, on one end face of the bobbin, a small strut that inserts and joins the base end of the coupler terminal is integrally formed, and the coil lead wire wound around this small strut is connected to the coupler terminal, and the small strut is wrapped and coiled. Since the projecting part that protrudes from the end face of the cover is formed integrally with the coil cover together with the coupler, the coil lead wire is securely wound around the small support to prevent loosening of the lead wire, the coil cover, the coupler, and the protrusion. The part can be molded.
[0011]
Further, the coupler is exposed to the outside through an opening provided from the peripheral wall of the housing to the bottom wall, and the protrusion is disposed in the opening so as to be adjacent to the bottom wall. There is no need to provide a housing space for the protruding portion in the housing, and the protruding portion does not protrude from the outer surface of the housing, so that the actuator can be made compact.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below on the basis of preferred embodiments of the present invention shown in the accompanying drawings.
[0013]
1 is a longitudinal sectional view of an active vibration isolating support apparatus having an electromagnetic actuator of the present invention, FIG. 2 is a sectional view taken along line 2-2 in FIG. 1, FIG. 3 is a sectional view taken along line 3-3 in FIG. Is an enlarged view of part 4 of FIG. 1, FIG. 5 is a view taken in the direction of arrow 5 in FIG. 4, FIG. 6 is a view taken in the direction of arrow 6 in FIG. FIG. 2 is a partially cutaway side view of a connection bolt and a lock screw.
[0014]
First, in FIG. 1, an active vibration isolating support device M including an electromagnetic actuator 31 of the present invention is interposed between them in order to elastically support an engine E on a vehicle body frame F in an automobile.
[0015]
The active vibration isolating support device M has a substantially axisymmetric structure with respect to the axis L, a plate-like mounting bracket 11 coupled to the engine E, and an inner cylinder 12 welded to the mounting bracket 11. , An outer cylinder 13 coaxially disposed on the outer periphery of the inner cylinder 12, and a first elastic body 14 made of thick rubber or the like vulcanized and bonded to the conical surfaces of the inner cylinder 12 and the outer cylinder 13 facing each other. The first orifice forming member 15, the second orifice forming member 16, and the third orifice forming member 17 that are integrated vertically are arranged below the first elastic body 14. .
[0016]
The first orifice forming member 15 has a disk shape and has an opening 15b at the center thereof. The second orifice forming member 16 has a ring-like cross section with the upper surface open and has an annular shape, and is integrated with the first orifice forming member 15 so that the open upper surface is closed by the first orifice forming member 15. To be joined. The third orifice forming member 17 also has an annular shape with an open upper surface and has an annular shape, and the second orifice forming member 16 has an open upper surface closed by the second orifice forming member 16. They are joined together. The outer peripheral portions of the first and second orifice forming members 15, 16 are overlapped and integrated with each other, and are fixed to an annular caulking fixing portion 13 a provided continuously to the lower portion of the outer cylinder 13.
[0017]
The outer peripheral surface of the annular second elastic body 18 made of rubber or the like is vulcanized and bonded to the inner peripheral surface of the third orifice forming member 17, and is arranged on the axis L on the inner peripheral surface of the second elastic body 18. Then, the first cap member 19 having the lower surface opened is vulcanized and bonded. The second cap member 23 and the movable member 20 are sequentially fixed to the first cap member 19 by press fitting. The second cap member 23 has a lower end projecting downward from the first cap member 19, and an inner peripheral end of a diaphragm 22 disposed below the second elastic body 18 on the outer peripheral surface of the projecting portion. Is vulcanized and bonded. A ring member 21 is vulcanized and bonded to the outer periphery of the diaphragm 22. The ring member 21 is fixed to the caulking fixing portion 13 a together with the outer peripheral portions of the first and second orifice forming members 15 and 16. The movable member 20 can move up and down together with the first and second cap members 19 and 23 by the bending of the second elastic body 18 and the diaphragm 22.
[0018]
Thus, a first liquid chamber 24 that encloses a liquid is defined between the first elastic body 14 and the second elastic body 18, and a liquid is similarly provided between the second elastic body 18 and the diaphragm 22. A second liquid chamber 25 to be sealed is defined. The first and second liquid chambers 24 and 25 communicate with each other via an upper orifice 26 and a lower orifice 27 formed by first to third orifice forming members 15 to 17.
[0019]
The upper orifice 26 is defined between the first and second orifice forming members 15 and 16 by a little less than one round (see FIG. 2), and the partition walls 26a constituting both end walls of the upper orifice 26 are the first. And welded between the second orifice forming members 15 and 16. The upper orifice 26 communicates with the first liquid chamber 24 through the through hole 15a of the first orifice forming member 15 on one side of the partition wall 26a, and the through hole of the second orifice forming member 16 on the other side of the partition wall 26a. It communicates with the lower orifice 27 via 16a.
[0020]
The lower orifice 27 is defined between the second and third orifice forming members 16 and 17 by a little less than one round (see FIG. 3), and the partition walls 27a constituting both end walls of the lower orifice 27 are the first. And welded between the second orifice forming members 15 and 16. The upper orifice 26 communicates with the upper orifice 26 through the through hole 16a on one side of the partition wall 27a, and the second liquid chamber through the through hole 17a of the third orifice forming member 17 on the other side of the partition wall 27a. 25 is communicated. As described above, the first and second liquid chambers 24 and 25 communicate with each other through the upper and lower orifices 26 and 27 connected in series.
[0021]
Further, a cylindrical bracket 28 is fixed to the caulking fixing portion 13a, and the active vibration-proof support device M is attached to the vehicle body frame F by fixing it to the vehicle body frame F. The cylindrical bracket 28 and the outer cylinder 13 constitute a support casing C of the active vibration-proof support device M.
[0022]
An actuator support member 30 is fixed to the cylindrical bracket 28, and an electromagnetic actuator 31 that drives the movable member 20 is supported by the actuator support member 30.
[0023]
In FIG. 4, the actuator 31 includes a bottomed cylindrical housing 32 made of a magnetic material having an open upper surface, and a flange 32 a formed at the upper end thereof is fixed to the actuator support member 30. The housing 32 is a magnetic body, and a fixed core 33, a coil assembly 34, and an upper yoke 35 are sequentially attached inside the housing 32. The fixed core 33 has a suction surface 33 a at the top, a positioning shaft 33 b protrudes from the bottom, and a stepped bowl-shaped lower yoke 36 is formed on the outer periphery. The lower yoke 36 is connected to the bottom wall of the housing 32. The positioning shaft 33b is press-fitted into the positioning hole 37 of the bottom wall 32b in close contact with the positioning hole 32b. In this way, the fixed core 33 is fixed to the housing 32.
[0024]
The coil assembly 34 includes a synthetic resin bobbin 38 disposed on the outer periphery of the fixed core 33 and a coil 39 wound around the bobbin 38. A small column 38a projecting downward is provided on the outer periphery of the lower flange of the bobbin 38, and when the small column 38a is formed, the base end portion of the coupler terminal 40 is insert-coupled thereto. A lead wire 39a of a coil 39 is wound around the small support 38a, and the tip thereof is connected to the coupler terminal 40 by soldering or electric welding.
[0025]
After the lead wire 39a is connected to the coupler terminal 40, a cylindrical coil cover 41 that is in close contact with both the upper and lower end surfaces of the bobbin 38 and the outer peripheral surface of the coil 39 is injected by a synthetic resin in order to seal the coil 39 to the bobbin 38. Molded. At this time, the coil cover 41 encloses the coupler 42 holding the coupler terminal 40 and projecting outward in the radial direction of the cover 41, and the small strut 38a leading wire 39a on the lower end surface of the cover 41. The protruding portion 42a that protrudes is integrally formed. The coupler 42 is disposed so as to be exposed to the outside of the housing 32 through an opening 43 provided from the bottom wall 32 b to the peripheral wall of the housing 32 (see FIGS. 5 and 6), and the protrusion 42 a is formed on the housing 32. It arrange | positions in the opening part 43 so that the bottom wall 32b may be adjoined.
[0026]
An annular seal member 45 is attached to the upper end surface of the coil assembly 34, particularly the upper end surface of the coil cover 41. A plurality of seal protrusions 46, 46 are formed integrally on the lower end surface of the coil assembly 34, particularly the lower end surfaces of the bobbin 38 and the coil cover 41, so as to surround the fixed core 33 and are arranged concentrically. And an elastic plate 47 is interposed between the thin outer peripheral portion 36 a of the lower yoke 36. The elastic plate 47 is formed of an elastic material such as NBR or silicon rubber.
[0027]
The upper yoke 35 is fixed to the inner peripheral surface of the housing 32 by press fitting so as to press and hold the coil assembly 34 toward the lower yoke 36. As a result, the seal member 41 and the elastic plate 47 are compressed, so that the coil assembly 34 is elastically supported between the upper yoke 35 and the lower yoke 36 without any backlash. The waterproofness of 39 is improved. In particular, the seal protrusions 46, 46 on the lower end surface of the bobbin 38 and the coil cover 41 bite into the upper surface of the elastic plate 47 to make the seal with the elastic plate 47 more reliable. When rainwater or cleaning water that has entered the bottom of the housing 32 accumulates, even if there is poor adhesion between the coil cover 41 and the coil 39 and the bobbin 38, the water will not only enter the coil 39 but also the inner periphery of the bobbin 38. It is possible to reliably prevent water from entering the side.
[0028]
A thin cylindrical bearing member 50 is slidably fitted to the inner peripheral surface of the cylindrical portion 35a disposed on the inner periphery of the bobbin 38 of the upper yoke 35. An inward flange 50a facing radially inward is formed at the upper end of the bearing member 50, and an outward flange 50b facing outward in the radial direction is integrally formed at the lower end thereof. 50 b is overlapped on the thick inner peripheral portion 36 b of the lower yoke 36 via an annular elastic plate 51, and a set spring 52 formed of a coil spring is contracted between the outward flange 50 b and the fixed core 33. As a result, the bearing member 50 is elastically held on the lower yoke 36 and the vibration is prevented.
[0029]
Further, when the movable core 53 is lowered toward the fixed core 33, the elastic plate 51 receives the lower end of the movable core 53 so as to avoid a collision between the cores 33 and 53, and defines the lowering limit. , It also serves as a lowering stopper for the movable core 53.
[0030]
The bearing member 50 is slidably fitted with a movable core 53 having a suction surface 53a facing the suction surface 33a of the fixed core 33 via an air gap g. The upper end of a connecting bolt 55 that loosely passes through a relatively large-diameter through hole 54 that is open to the movable member 20 is screwed to the movable member 20, and the lower end of the connecting bolt 55 is around the through hole 54 of the movable core 53. An adjustment nut 56 that supports the lower end surface is screwed together. At this time, a set spring 57 that holds the movable core 53 in a support position by the adjustment nut 56 is contracted between the movable member 20 and the movable core 53. In this way, the movable core 53 is elastically sandwiched between the adjustment nut 56 screwed into the connecting bolt 55 integrated with the movable member 20 and the set spring 57. A radial ventilation groove 58 communicating with the through hole 54 is formed on the upper end surface of the adjustment nut 56 that is in pressure contact with the movable core 53, and the air in the space above and below the movable core 53 is raised and lowered. It is designed to facilitate distribution.
[0031]
Thus, if the screwing position of the adjusting nut 56 with respect to the connecting bolt 55 is advanced or retracted, the upper and lower positions of the movable core 53, that is, the suction surfaces 33a of the movable core 53 and the fixed core 33, in cooperation with the set spring 57, The air gap g between 53a can be adjusted. The adjustment position of the adjustment nut 56 is screwed and tightened to the adjustment nut 56 from below, and is fixed by the lock screw 59.
[0032]
As shown in FIGS. 7 and 8, the thread portion of the connecting bolt 55 is a normal right-hand thread, whereas the thread portion of the lock screw 59 is a left-hand thread. If the lock screw 59 is tightened by another tool while being held at a predetermined adjustment position by a tool, the torque of the lock screw 59 is transmitted to the connecting bolt 55 by friction, and the connecting bolt 55 is pulled to the lock screw 59 side. Therefore, the adjustment nut 56 can be reliably locked at the adjustment position.
[0033]
An adjustment work hole 60 that allows the adjustment nut 56 to enter and exit is provided at the center of the fixed core 33 so that the lock screw 59 and the adjustment nut 56 can be operated by a tool inserted into the adjustment work hole 60. It has become. The adjustment work hole 60 includes a screw hole 60a and a fitting hole 60c having a diameter larger than that of the screw hole 60a and connected to the lower end of the screw hole 60a via an annular shoulder 60b. On the other hand, the plug body 61 for closing the adjustment work hole 60 has a bottomed cylindrical shape with an open upper end. The screw cylinder 61a that is screwed into the screw hole 60a while receiving the adjustment nut 56, and the fitting hole 60c. A sealing member 64 that is closely attached to the inner peripheral surface of the fitting hole 60c is attached to the outer periphery of the flange portion 61b. A polygonal tool engaging protrusion 62 is formed on the lower surface of the bottom 61c.
[0034]
Thus, until the flange portion 61b fitted in the fitting hole 60c contacts the shoulder portion 60b, the screw cylinder 61a is screwed into the screw hole 60a and tightened, whereby the adjustment work hole 60 is watertight. Can be closed.
[0035]
An elastic plate 63 is joined to the upper surface of the bottom portion 61c of the plug body 61, and the bottom portion 61c receives the lower end of the adjustment nut 56 through the elastic plate 63 so as to buffer the lower limit of the movable member 20. It has become. However, when the adjusting nut 56 comes into contact with the bottom 61c of the plug body 61, the movable member 53 is further lowered while the movable member 53 compresses the set spring 57 after the movable core 53 reaches the aforementioned lower limit due to the lowering of the movable member 20. This is the case.
[0036]
In the bearing member 50, the suction surfaces 33a and 53a facing each other of the fixed core 33 and the movable core 53 are each formed in a conical surface so as to define a conical cylindrical air gap g therebetween. The suction surface 53 a of the movable core 53 is disposed so as to surround the suction surface 33 a of the fixed core 33. As a result, a relatively large suction force and a relatively long stroke of the movable core 53 can be obtained also in the relatively small diameter fixed core 33 and the movable core 53 in the bearing member 50.
[0037]
Moreover, since the suction surface 53a of the movable core 53 is formed on the inner peripheral surface side of the core 53, the support span of the movable core 53 by the bearing member 50 is ensured sufficiently long regardless of the suction surface 53a. In addition, stable raising and lowering of the movable core 53 can be ensured. In this case, forming a low friction material layer such as Teflon on the outer peripheral surface of the movable core 53 is effective in obtaining a more stable and smooth raising and lowering of the movable core 53.
[0038]
The set spring 57 is composed of a coil spring, and is arranged concentrically with the connecting bolt 55 by fitting into the large diameter portion 55a of the base of the connecting bolt 55. An annular spring seat 65 made of a steel plate is interposed between the set spring 57 and the movable core 53 to prevent the movable core 53 from being worn. The spring seat 65 has inner and outer concentric positioning tube portions 66 and 67 that stand from the inner and outer peripheral edge portions of the spring spring 65 along the inner and outer peripheral surfaces of the set spring 57. 67 is formed longer than the inner positioning cylinder portion 66. In order to facilitate the insertion of the set spring 57 between the positioning cylinder portions 66 and 67, funnel portions 66a and 67a are formed at the upper end portions of the positioning cylinder portions 66 and 67. Further, a low friction material layer such as Teflon is formed on at least one of the opposing contact surfaces of the spring seat 65 and the movable core 53, so that the sliding property of the spring seat 65 with respect to the movable core 53 is improved.
[0039]
Referring again to FIG. 1, an electronic control unit U is connected to the coil 39 of the actuator 31 via a coupler 42. The electronic control unit U includes a rotational speed sensor Sa for detecting the engine rotational speed, an active vibration isolating support. The detection signals of the load sensor Sb for detecting the load input to the apparatus M and the acceleration sensor Sc for detecting the acceleration acting on the engine E are input.
[0040]
Next, the operation of this embodiment will be described.
[0041]
When the actuator 31 of the active vibration isolating support apparatus M is in an inoperative state, the first and second liquid chambers 24 and 25 communicating with each other via the upper and lower orifices 26 and 27 are maintained at the same pressure. However, since the pressure receiving area in the first liquid chamber 24 of the first cap member 19 coupled to the movable member 20 is larger than the pressure receiving area in the second liquid chamber 25, the area difference between the first liquid chamber 24 and the first liquid chamber 24 is larger. A downward load multiplied by the pressure acts on the movable member 20, and when the load and the repulsive force of the second elastic body 18 against the load are balanced, the movable member 20 is stopped, and the fixed core 33 and the movable core A predetermined initial air gap g is formed between the suction surfaces 33a and 53a of 53.
[0042]
Thus, when a low-frequency shake vibration is generated in the engine E while the automobile is running, the first elastic body 14 is deformed by the load input from the engine E and the volume of the first liquid chamber 24 changes. Liquid flows back and forth between the first and second liquid chambers 24 and 25 communicating with each other via the upper and lower orifices 26 and 27. When the volume of the first liquid chamber 24 is enlarged or reduced, the volume of the second liquid chamber 25 is reduced or enlarged accordingly, but the volume change of the second liquid chamber 25 is absorbed by the elastic deformation of the diaphragm 22. At this time, the shapes and dimensions of the upper and lower orifices 26 and 27 and the spring constant of the first elastic body 14 are set so as to exhibit a high spring constant and a high damping force in the frequency region of the shake vibration. Vibration transmitted from the engine E to the vehicle body frame F can be effectively reduced.
[0043]
In such a low-frequency shake vibration region of the engine E, the actuator 31 is kept in an inoperative state.
[0044]
When the engine E generates vibrations having a frequency higher than that of the shake vibration, that is, idle vibrations or booming sound vibrations generated during the eye drink of the engine E, the upper part connecting the first and second liquid chambers 24, 25 and In the liquid stick state in the lower orifices 26 and 27, the vibration isolating function can be exhibited. In such a case, the actuator 31 is driven to exhibit the vibration isolating function.
[0045]
That is, the electronic control unit U controls the energization to the coil 39 of the actuator 31 based on detection signals input from the engine speed sensor Sa, the load sensor Sb, the acceleration sensor Sc, and the like. Specifically, when the engine E is biased downward due to vibration and the volume of the first liquid chamber 24 is reduced due to the downward deformation of the first elastic body 14, the coil 39 is excited. Then, the movable core 53 is sucked toward the fixed core 33 side. As a result, the movable core 53 can be lowered while deforming the second elastic body 18 to increase the volume of the first liquid chamber 24, thereby suppressing an increase in pressure in the chamber 24. The active vibration isolation support device M generates an active support force that prevents transmission of a downward load from the engine E to the vehicle body frame F.
[0046]
Contrary to the above, when the engine E is biased upward to increase the volume of the first liquid chamber 24 and the pressure in the chamber 24 increases, the coil 39 is demagnetized and the movable core 53 is released. As a result, the movable core 53 is raised by the repulsive force of the second elastic body 18, and the volume of the first liquid chamber 24 is reduced, so that the pressure drop in the chamber 24 can be suppressed. The anti-vibration support device M generates an active support force that prevents transmission of an upward load from the engine E to the vehicle body frame F.
[0047]
During such operation, when the downward load from the engine E to the first elastic body 14 is excessively increased, the pressure in the first liquid chamber 24 suddenly increases, and an excessive downward load is applied to the movable member 20. The movable member 20 first lowers the movable core 53 to its lower limit, that is, until the lower end surface of the core 53 is brought into contact with the elastic plate 51 on the thick inner peripheral portion 36b of the lower yoke 36, Thereafter, the set spring 57 is compressed and deformed, and the adjustment nut 56 is separated from the lower surface of the movable core 53, so that further movement of the movable member 20 toward the fixed core 33 is allowed. Therefore, an excessive load of the movable member 20 is absorbed by the set spring 57 to prevent the mutual contact between the fixed core 33 and the movable core 53 and the action of the overload on the movable core 53 and the elastic plate 51, and their durability. Can be secured.
[0048]
Then, after the movable core 53 reaches the lowering limit, when the lowering of the movable member 20 reaches a predetermined amount, the adjustment nut 56 is attached to the bottom 61c of the plug 61 fixed to the fixed core 33 via the elastic plate 63. Thus, an excessive load increase of the set spring 57 can be suppressed, and an increase in overload on the fixed core 33 and the movable core 53 can be prevented.
[0049]
By the way, the initial air gap g between the suction surfaces 33a and 53a of the fixed core 33 and the movable cores 33 and 53 when the actuator 31 is not in operation has characteristics relating to thrust and displacement of the movable member 20 in the active vibration-proof support device M. However, the initial air gap g may not be within an allowable range due to an integrated manufacturing error of each part from the attachment part of the second elastic body 18 to the movable core 53. In such a case, As described above, the initial air gap g can be adjusted appropriately and easily by advancing and retracting the screwing position of the adjusting nut 56 with respect to the connecting bolt 55. Therefore, it becomes possible to apply predetermined thrust and displacement to the movable member 20 with high accuracy by exciting the coil 39, and the performance of the active vibration-proof support device M can be improved.
[0050]
Further, if the adjustment nut 56 is operated to prepare a plurality of types of active vibration isolating support devices M having different initial air gaps g between the fixed core 33 and the movable cores 33, 53, characteristics corresponding to a plurality of vehicle types can be obtained. The active vibration isolating support device M can be easily obtained, which can contribute to cost reduction.
[0051]
Moreover, since the adjustment nut 56 is provided from the adjustment work hole 60 of the fixed core 33 that opens to the outside of the housing 32, the initial air gap is not affected by the assembly error of each part after the assembly of the active vibration isolating support device M is completed. g can be performed accurately.
[0052]
The fixed core 33 is hollow by having the adjustment work hole 60, but the positioning shaft 33b integrated therewith is press-fitted into the positioning hole 37 of the bottom wall 32b of the housing 32, and the flange-shaped lower yoke 36 is connected to the bottom wall. Since the fixed core 33 is firmly reinforced by being in close contact with 32b, it can sufficiently withstand even if it receives a contact impact from the movable core 53, and it does not cause a positional shift. Moreover, since the lower yoke 36 effectively increases the magnetic path around the coil assembly 34 in cooperation with the housing 32 and the upper yoke 35, the attractive force between the fixed and movable cores 33 and 53 is increased. Can do.
[0053]
On the other hand, the upper limit of the movable core 53 is defined by the upper end of the movable core 53 coming into contact with the inward flange 50a of the bearing member 50. When the movable core 53 abuts against the inward flange 50a, the impact force is transmitted to the set spring 52 via the bearing member 50 and the outward flange 50b and is absorbed by the elasticity. The spring 52 also serves as an impact absorbing member that protects the movable core 53 and the bearing member 50 from impact force.
[0054]
The movable core 53 is elastically held by the adjustment nut 56 by a set spring 57, and sufficient play is provided between the inner surface of the through hole 54 of the movable core 53 and the connecting bolt 55. The connecting bolt 55 can swing relatively, and therefore, even when a load in the tilt direction is applied to the movable member 20 during the operation of the active vibration isolating support device M, the movable core The inclination of 53 can be prevented and a good sliding relationship with the bearing member 50 can be maintained. In this case, the set spring 57 moves slightly in the lateral direction as the connecting bolt 55 swings, but a spring seat 65 that holds the lower end of the set spring 57 is between the set spring 57 and the movable core 53. Since a low friction material layer is formed on the contact surface of the spring seat 65 and the movable core 53, the spring seat 65 accompanying the set spring 57 slides smoothly on the upper surface of the movable core 53. As a result, the generation of wear powder from the movable core 53 can be effectively suppressed. Therefore, troubles caused by the wear powder, for example, the wear powder can be prevented from entering the sliding portions of the bearing member 50 and the movable core 53 and obstructing the movement of the movable core 53.
[0055]
The bearing member 50 is mounted at a fixed position on the lower yoke 36 by a very simple structure in which the set spring 52 is contracted between the outward flange 50b at the lower end and the upper yoke 35. High accuracy is not required and the cost can be reduced. Moreover, since the set spring 52 is disposed on the outer peripheral side of the bearing member 50, even if wear powder is generated between the set spring 52 and a portion where the set spring 52 is in pressure contact, the bearing member of the wear powder is generated. 50, and an elastic plate 51 that is in close contact therewith is interposed between the outward flange 50b and the lower yoke 36, so that the wear powder does not enter the bearing member 50. The elastic plate 51 can reliably prevent this, and the bearing member 50 can exhibit a good guide for the movable core 53 over a long period of time.
[0056]
The repulsive force of the set spring 52 is supported by the upper yoke 35 connected to the housing 32 and does not act on the movable core 53. Therefore, the fixed spring due to the repulsive force of the set spring 52 and the effective attractive force between the movable cores 33, 53 are used. Can be prevented, and the output performance of the movable core 53 can be improved.
[0057]
In the coil assembly 34, since the coil 39 and the coil cover 41 that is in close contact with the outer peripheral surface of the bobbin 38 are molded so as to seal the coil 39 to the bobbin 38, the waterproofness of the coil 39 can be improved. In addition, since the coil cover 41 is integrally formed with the coupler 42 that holds the coupler terminal 40 and protrudes radially outward, neither a lead wire connected to the coil 39 nor a coupler holder for supporting the coupler is required. Assembling man-hours are reduced and costs can be reduced.
[0058]
In addition, a small column 38a is formed integrally on one end surface of the bobbin 38 to insert-join the base end portion of the coupler terminal 40. The small column 38a is connected to the coupler terminal 40 and is connected to the coupler terminal 40. After that, a protruding portion 42a that wraps around the small column 38a and the lead wire 39a and protrudes from the lower end surface of the coil cover 41 is formed integrally with the coil cover 41 together with the coupler 42. By winding it around the small support 38a, it is possible to reliably prevent the lead wire 39a from being loosened, and to form the coil cover 41, the coupler 42 and the protruding portion 42a.
[0059]
Further, when the coupler 42 is exposed to the outside through the opening 43 provided from the peripheral wall of the housing 32 to the bottom wall 32b, the protrusion 42a is disposed in the opening 43 so as to be adjacent to the bottom wall 32b. Thus, it is not necessary to provide a housing space for the protruding portion 42a in the housing 32, and the protruding portion 42a does not protrude from the outer surface of the housing 32, whereby the actuator 31 can be made compact.
[0060]
The present invention is not limited to the above embodiment, and various design changes can be made without departing from the scope of the invention. For example, in the above-described embodiment, the movable member 20 and the connecting bolt 55 are integrated by screwing separately configured members. However, both the members 20 and 55 can be integrally formed of the same material. The fitting portion between the positioning shaft 33b of the fixed core 33 and the positioning hole 37 of the bottom wall 32b of the housing 32 can be fixed by welding instead of press fitting.
[0061]
【The invention's effect】
As described above, the present invention In According to the present invention, the fixed core supported by the bottom wall of the housing made of magnetic material, the movable core that is opposed to the fixed core via the air gap and drives the movable member, and surrounds the fixed and movable core, In an electromagnetic actuator comprising a coil assembly in which a coil is wound around a bobbin supported by a housing, a small column that insert-couples a base end portion of a coupler terminal is integrally formed on one end surface of the bobbin, The coil lead wire wound around the small column is connected to the coupler terminal, and the coil terminal is held on a coil cover formed on the outer periphery of the coil and bobbin so as to seal the coil to the bobbin. A coupler that protrudes radially outward of the coil assembly, and a protrusion that wraps around the small column and protrudes from an end surface of the coil cover. Seamlessly Because it was formed as one, Molded on the outer circumference of the coil and bobbin to seal the coil to the bobbin By coil cover , Coil waterproof can be improved, and the coil cover and coupler are integrated, so there is no need for a lead wire connected to the coil or a coupler holder to support the coupler, reducing the number of parts and assembly steps, and reducing costs. be able to. Further, by winding the coil lead wire around the small column, the lead wire can be surely prevented from being loosened, and the coil cover, the coupler and the protruding portion can be formed.
[0062]
Also In particular Coupler C Exposed to the outside through an opening provided from the peripheral wall to the bottom wall of Uzing, Sudden Out bottom Since it is arranged in the opening so as to be adjacent to the wall, it is not necessary to provide a housing space for the protrusion in the housing, and the protrusion does not protrude from the outer surface of the housing, so that the actuator can be configured compactly.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of an active vibration isolating support device including an electromagnetic actuator according to the present invention.
2 is a sectional view taken along line 2-2 of FIG.
3 is a cross-sectional view taken along line 3-3 in FIG.
4 is an enlarged view of the main part of FIG.
FIG. 5 is a view taken in the direction of arrow 5 in FIG.
6 is a view taken along arrow 6 in FIG.
7 is a perspective view of the adjusting nut in FIG. 4. FIG.
[Fig. 8] Exploded partial vertical side view of the adjusting nut, connecting bolt and lock screw
[Explanation of symbols]
g ... Air gap
20... Movable member
31 ... Electromagnetic actuator
32 .... Housing
32b ... Bottom wall
33... Fixed core
34... Coil assembly
38 ... Bobbins
38a ... Small prop
39 ... Coil
39a ... Lead wire
40 ・・・・ Coupler terminal
41 ... Coil cover
42 ... Coupler
42a ... projecting portion
43 ... Opening
53 ... Moveable core

Claims

The fixed core (33) supported by the bottom wall (32b) of the housing (32) made of a magnetic body, and the movable member (20) is driven against the fixed core (33) via an air gap (g). A movable core (53), and a coil assembly formed by winding a coil (39) around a bobbin (38) supported by the housing (32) surrounding the fixed and movable cores (33, 53). 34),
A small strut (38a) that insert-couples the base end of the coupler terminal (40) is integrally formed on one end face of the bobbin (38), and the coil (39) is wound around the small strut (38a). A coil formed on the outer periphery of the coil (39) and the bobbin (38) so that the lead wire (39a) is connected to the coupler terminal (40) and the coil (39) is sealed to the bobbin (38). A coupler (42) holding the coupler terminal (40) and protruding outward in the radial direction of the coil assembly (34) and the small column (38a) are wrapped in a cover (41) and the coil cover ( protrusion protruding from the end surface of 41) (42a) and was formed seamlessly integrated, said coupler (42), said housing (openings provided from the peripheral wall toward a bottom wall (32 b) 32) (43) Through To expose to the outside Te, an electromagnetic actuator, wherein the protruding portion (42a) disposed on said bottom opening so as to adjoin the wall (32b) (43) within.