JP4198771B2

JP4198771B2 - Controlled liquid-filled vibration isolator

Info

Publication number: JP4198771B2
Application number: JP34261997A
Authority: JP
Inventors: 明徳市川; 孝徳塚本; 幸夫高島; 芳雄井原; 政嗣高岡
Original assignee: Toyo Tire and Rubber Co Ltd
Current assignee: Toyo Tire Corp
Priority date: 1997-12-12
Filing date: 1997-12-12
Publication date: 2008-12-17
Anticipated expiration: 2017-12-12
Also published as: JPH11173372A

Description

【０００１】
【発明の属する技術分野】
本発明は、主として自動車用のエンジンマウントとして用いる制御型の液封入式防振装置に関するものである。
【０００２】
【従来の技術と発明が解決しようとする課題】
自動車のエンジン等をその振動を車体に伝達させないように支承するマウントとしての液封入式防振装置は、液体が封入された主液室と、ダイヤフラムにより仕切られた空気室をもつ副液室とをオリフィスにより連通させて、このオリフィスにより振動減衰効果を得るものである。
【０００３】
近年、この種の液封入式防振装置として、エンジンシェイク時の振動とアイドリング時の振動とが異なった周波数域にあることから、例えば主液室に通じる２つのオリフィスを設け、この２つのオリフィスのそれぞれに専用のダイヤフラムをもつ２つの副液室を設け、２つのオリフィスのうち、液体通過抵抗の小さい（例えば断面積の大きい）オリフィスに連なる一方のダイヤフラムに接する空気室を圧力調整可能となし、これにより振動状態に応じて、前記の空気室に接するダイヤフラムを可動状態と不動状態に切替制御できるように構成し、液体通過抵抗の大きい（例えば断面積の小さい）オリフィスを機能させる際には、前記ダイヤフラムの動きを止めて、断面積の大きいオリフィスを機能させないようにし、それぞれのオリフィスによって異なった周波数帯にある振動に対して十分な減衰効果を発揮させるようにした切替制御型の液封入式防振装置が提案されている。その１例として、特開平６−４８１８８号公報がある。
【０００４】
前記提案の防振装置においては、外筒金具に嵌着された仕切部材を中間にして上部側に、防振基体と接する主液室と、圧力調整可能な空気室側つまり制御側のダイヤフラムを有する第１副液室が設けられ、下部側に、大気側のダイヤフラムを有する第２副液室が設けられている。
【０００５】
しかしながら、前記制御側のダイヤフラムは中間筒金具に加硫接着し、該中間筒金具を外筒金具に嵌合することにより、仕切部材の上側に添設させており、しかもこの中間筒金具の内側にオリフィス形成のための仕切り金具を嵌着して、前記第１副液室に通ずる第１のオリフィスを形成し、さらにその上に防振基体の外周に加硫接着した本体金具を嵌着している。
【０００６】
すなわち、前記第１副液室に通じる第１のオリフィスは、ダイヤフラムと一体の中間筒金具の内側にあり、またそのために前記第２副液室に通じる第２のオリフィスは、前記第１のオリフィスと主液室に対する出入口を共通にして、仕切り部材を貫通する孔形状に形成せざるを得ないものである。
【０００７】
それゆえ、前記提案の防振装置においては、性能特性を低下させずに装置外径を小さく設計するのが難しく、また中間筒金具の存在のために、組立ての際にオリフィス内の空気を抜き難くなり、組立てに時間がかかりコスト高となる等の問題があった。
【０００８】
本発明は、上記に鑑みてなしたもので、装置外径を小さく設計することが容易であり、しかも組立て時にオリフィス内の空気を簡単に抜くことができ、組立が容易な信頼性の高い制御型の液封入式防振装置を提供するものである。
【０００９】
【課題を解決するための手段】
請求項１の発明は、振動源側の金具と支持側の外筒金具との間に介在するゴム弾性体よりなる防振基体と、この防振基体下方の外筒金具の内部において、該防振基体が室壁の一部をなす主液室と、主液室に通ずる第１および第２の２つのオリフィスと、第１および第２のオリフィスに連なり空気室または外部との間を隔するダイヤフラムをもつ第１および第２の副液室を備える制御型の液封入式防振装置であって、上記の課題を解決するために、次のような構成を有している。
【００１０】
すなわち、前記外筒金具の下部にダイヤフラムがシール状態に固着され、これより上方の外筒金具の内周に仕切り部材が液密に嵌着され、該仕切り部材と前記ダイヤフラムとの間が第２副液室として形成されるとともに、この第２副液室から主液室に通じる第２のオリフィスが前記仕切り部材の外周部の凹部によって外筒金具との間で形成され、また前記仕切り部材の上面内方部において、上面中央部が湾曲状に凹設されるとともに、該凹設部分の周辺部に圧入用溝が形成され、環状のカラー金具を外周に固設してなる円形のダイヤフラムが、前記圧入用溝に対する前記カラー金具の圧入によりセンタ軸心と同心の配置で前記凹設部分の開口を閉塞するように取着されてなり、該ダイヤフラムには前記仕切り部材との間にクリアランスを保持するための突部が形成されており、前記ダイヤフラムと仕切り部材との間が外部から圧力調整可能な空気室として形成され、環状の突出部を下面に形成したプレス成形品よりなるカバー金具が、前記ダイヤフラムの周縁部を前記突出部で押さえてシールするように、前記仕切り部材より上方の外筒金具内周に液密に嵌合して被着され、該カバー金具と前記ダイヤフラムの間が第１副液室として形成されるとともに、その外方のカバー金具と仕切り部材および外筒金具とにより画された環状部分が第１のオリフィスとして形成され、前記第１のオリフィスと前記第２のオリフィスとは、主液室に対する出入口を共通にして、かつ仕切り部材の上下において外筒金具内周に沿う周方向の流路がセンタ軸心と同心の配置によるドーナツ状をなすように形成され、さらに前記カバー金具の外周端部を外筒金具との間に挾圧するように前記防振基体の外周部が前記外筒金具に液密に嵌着されて組立て構成されてなることを特徴とする。
【００１１】
この構成の液封入式防振装置によれば、圧力調整可能な空気室側のダイヤフラムは、その外周の環状のカラー金具が仕切り部材の上面内方部で圧入用溝に対する圧入により固定されることによってセンタ軸心と同心に配置されているので、このダイヤフラムより外方のカバー金具と仕切り部材および外筒金具との間に第１のオリフィスを形成することができ、またこの第１のオリフィスと主液室に対する出入口を共通にする第２のオリフィスについても、仕切り部材の外周部の凹部によって外筒金具との間に形成することができることになる。
【００１２】
すなわち、第１および第２のオリフィスは、主液室に対する出入口を共通にして、かつ仕切り部材の上下でいずれも外筒金具の内周に沿う周方向の流路がセンタ軸心と同心の配置によるドーナツ状をなすように設けられており、そのため、従来品に対して性能特性を低下させずに装置外径を小さく設計することが可能になる。また組立て時の空気抜きも簡単に行なうことができ、組立作業も容易になる。
【００１３】
請求項２の発明は、前記の液封入式防振装置において、前記空気室が、仕切り部材の内部を通り外筒金具の側外部に通じる連通路を介して負圧源と大気圧源とに切替接続可能な切替手段に連結されてなり、前記連通路に外筒金具より外方に突出する接続用パイプが圧入されていることを特徴とする。
【００１４】
これにより、ガソリンやオイルを含んだ流通する気体による外筒金具内周のシールゴムの汚染や劣化を防止できる。
【００１５】
【発明の実施の形態】
次に本発明の実施の形態を図面に基いて説明する。
【００１６】
図１はこの発明の実施例に係る制御型の液封入式防振装置を示し、図２は同装置の平面図を示している。
【００１７】
図において、（１）は自動車のエンジン等の振動源が取付けられる振動源側のボス金具、（２）はシャーシやフレーム等に取付けられる支持側の外筒金具であり、上下に開口する筒状をなしている。
【００１８】
（３）は振動源側の荷重を受けるゴム弾性体よりなる厚肉の防振基体であり、図に示すように略傘形の湾曲形状をなしており、この中央上部に前記振動源側のボス金具（１）が一部埋設状態に加硫接着されている。防振基体（３）の下部外周には補強金具（３ａ）が加硫接着され、該補強金具（３ａ）が前記外筒金具（２）の上部内周に後述するように嵌着されて、前記ボス金具（１）と、前記外筒金具（２）の間に介設されている。
【００１９】
前記防振基体（３）の下方における外筒金具（２）の内部には、該防振基体（３）が室壁の一部をなす主液室（４）と、該主液室（４）に通ずる液体通過抵抗の異なる第１および第２の２つのオリフィス（５）（６）と、液体通過抵抗の小さい（断面積の大きい）第１のオリフィス（５）に連なりかつ空気室（７）との間を隔するダイヤフラム（８）をもつ第１副液室（９）と、前記より液体通過抵抗の大きい（断面積の小さい）第２のオリフィス（６）に連なりかつ外部との間を隔するダイヤフラム（１０）をもつ第２副液室（１１）とを備えている。
【００２０】
（１２）は前記外筒金具（２）の中間筒部（２ａ）に対しシールゴム部（１３）を介して液密に嵌着された仕切り部材である。この仕切り部材（１２）と前記防振基体（３）との間が液体を封入した主液室（４）として形成され、前記第１副液室（９）が仕切り部材（１２）の上側に、第２副液室（１１）が仕切り部材（１２）の下側に設けられている。
【００２１】
すなわち、前記外筒金具（２）の中間筒部（２ａ）に段部（２ｂ）を介して連続するやや径小の筒状下部（２ｃ）には、第２副液室（１１）の室壁の一部をなすゴム膜よりなるダイヤフラム（１０）が、前記外筒金具（２）内周のシールゴム部（１３）と一体に加硫接着手段により固設されている。そして、前記仕切り部材（１２）の周縁部下端（12ａ）が前記段部（２ｂ）に当接して、その内方の仕切り部材（１２）と前記ダイヤフラム（１０）との間が第２副液室（１１）として形成され、ダイヤフラム（１０）により大気との間が隔されている。
【００２２】
また前記仕切り部材（１２）の外周部には、縦溝状の凹部（６ａ）と該凹部（６ａ）に連続する周方向の凹部（６ｂ）とが形成されており、前記外筒金具（２）に嵌着することにより、前記凹部（６ａ）（６ｂ）の部分が外筒金具（２）に沿う第２のオリフィス（６）として形成され、連通孔（６ｃ）により第２副液室（１１）に通じている。
【００２３】
また前記仕切り部材（１２）の上面内方部には、外周部に環状のカラー金具（１５）を加硫接着手段により固設してなるダイヤフラム（８）が、前記カラー金具（１５）の圧入によりセンタ軸心と同心の配置で取着されており、該ダイヤフラム（８）と仕切り部材（１２）との間が所定のクリアランスを保有する圧力調整可能な空気室（７）として形成されている。（８ａ）は一定以上のクリアランスを保持するための突部である。
【００２４】
本発明においては、図のように、前記仕切り部材（１２）の空気室（７）に相当する上面中央部が湾曲状に凹設されるとともに、該凹設部分（12ｂ）の周辺部に圧入用溝（12ｃ）が形成され、前記ダイヤフラム（８）がカラー金具（１５）を前記圧入用溝（12ｃ）に圧入されることにより、前記凹設部分（12ｂ）の開口を閉塞するように取着されている。図３は前記仕切り部材（１２）と前記カラー金具付きのダイヤフラム（８）を分離して示している。
【００２５】
前記空気室（７）は、仕切り部材（１２）の内部を通り側面から外筒金具（２）の側外部に通じる連通路（１６）を介して負圧源と大気圧源とのいずれかに切替接続可能なバルブ等の切替手段（１７）に連結されており、該切替手段（１７）を制御手段（１８）からの指令信号等の操作で負圧あるいは大気圧のいずれかを導入できるようになっている。
【００２６】
これにより、前記ダイヤフラム（８）を可動状態と不動状態に切替制御でき、液体通過抵抗の大きい第２のオリフィス（６）を機能させる際には、前記ダイヤフラム（８）の動きを止めて、断面積の大きい第１のオリフィス（５）を機能させないようにし、それぞれのオリフィス（５）（６）により、異なった周波数帯にある振動に対して十分な減衰効果を発揮できるようになっている。
【００２７】
（１９）は前記連通路（１６）に対し圧入された接続用パイプを示し、外筒金具（２）より突出状をなしている。これによりガソリンやオイルを含んだ流通する気体による外筒金具（２）内周のシールゴムの汚染や劣化を防止できる。
【００２８】
前記仕切り部材（１２）の主液室（４）の側には、環状の突出部（20ａ）を下面に形成した鋼板等からのプレス成形品よりなるオリフィス形成部材を兼ねるカバー金具（２０）が、前記ダイヤフラム（８）の周縁部（８ａ）を前記突出部（20ａ）で押えてシールするように、前記外筒金具（２）の内周に液密に嵌合して被着されている。これにより、前記突出部（20ａ）の内方の前記ダイヤフラム（８）との間が第１副液室（９）として形成され、さらにその外方のカバー金具（２０）と仕切り部材（１２）および外筒金具（２）により画された環状の空間部分が、連通孔（２１）および（２２）により前記主液室（４）と前記第１副液室（９）とに通じる比較的断面積の大きい第１のオリフィス（５）として形成されている。そして前記第２のオリフィス（６）は、この第１のオリフィス（５）の連通孔（２１）を通じて主液室（４）に連通している。
【００２９】
すなわち、前記第１のオリフィス（５）と第２のオリフィス（６）とは、主液室（４）に対する出入口を共通にして、かついずれも外筒金具（２）内周に沿う形で設けられており、仕切り部材（１２）の上下に位置する周方向の流路が主液室（４）のセンタ軸心と同心の配置によるドーナツ状をなすように設けられていることになる。また空気室（７）に接するダイヤフラム（８）についても前記センタ軸心に対しずれなく同心に形成されている。
【００３０】
さらに前記外筒金具（２）の中間筒部（２ａ）と段部（２ｄ）を介して連続する径大の筒状上部（２ｅ）は、前記防振基体（３）の外周の補強金具（３ａ）に対し液密に嵌着され、かしめ手段あるいは絞り手段等により固定されている。また防振基体（３）が前記のように固定されることにより、前記カバー金具（２０）の周縁部を前記段部（２ｄ）との間に挾圧して固定するようになっている。
【００３１】
また図の（２３）は、外周に支持側の固定用ブラケット（２４）が固着された筒状のスタビライザであって、その下部内周に前記外筒金具（２）の上部（２ｅ）が圧入されて固定されている。
【００３２】
前記のスタビライザ（２３）は、上端部をボス金具（１）のストッパー用フランジ部（１ａ）より上方に延長するとともに、上端部を内方に折曲形成して、その内側端部をストッパ（２５）として形成している。前記フランジ部（１ａ）の上面にはストッパゴム部（１ｂ）が付設されており、上方への変位が生じたときに前記ストッパ（２５）に上向に当接して、それ以上の上方への大変位を抑制できるようになっている。（２７）はボス金具（１）の上端に圧入手段等により固定された振動源側の取付金具であり、該取付金具（２７）には加硫接着手段によりスカート状のカバーゴム部（27ｂ）と一体のストッパゴム部（27ａ）が付設され、下方向への大変位時に前記ストッパ（２５）に当接することでストッパ作用を果せるようになっている。
【００３３】
なお、図１においては、前記ストッパゴム部（１ｂ）がストッパ（２５）に当接して図示されているが、エンジン等の荷重を負荷することにより防振基体（３）が弾性変形して下方へ変位し、前記ストッパ（２５）と上下のストッパゴム部（27ａ）（１ｂ）との間にそれぞれ所定のクリアランスを保有する。
【００３４】
上記構成の液封入式防振装置は、次のようにして組立て構成する。
【００３５】
先ず、仕切り部材（１２）の上面の凹設部分（12ｂ）の周辺に有する圧入用溝（12ｃ）に対し、前記ダイヤフラム（８）の外周部に固着したカラー金具（１５）を圧入して、仕切り部材（１２）とダイヤフラム（８）との間に空気室（７）としての所定のクリアランスを保有するように取着する。この仕切り部材（１２）には、第２のオリフィス（６）となる縦方向および周方向の凹部（６ａ）（６ｂ）を外周に形成し、かつ上面の凹設部分から側面に通じる連通路（１６）を形成しておく。
【００３６】
次に、液槽中において、前記の仕切り部材（１２）を、下部内周にダイヤフラム（１０）がシールゴム部（１３）とともに一体に加硫接着されている外筒金具（２）の中間筒部（２ａ）内に上方より圧入、特に段部（２ｂ）に当接する位置まで圧入し、シールゴム部（１３）を介して液密に嵌着する。この際、前記仕切り部材（１２）の側面に開口する連通路（１６）を中間筒部（２ａ）に有する開孔（１６ａ）の位置に合せる。これによって、仕切り部材（１２）とダイヤフラム（１０）とにより囲まれた部分が第２副液室（１１）として、また前記凹部（６ａ）（６ｂ）の部分が外筒金具（２）に沿う第２のオリフィス（６）として形成される。
【００３７】
次に、オリフィス形成部材を兼ねるカバー金具（２０）を外筒金具（２）の筒状上部（２ｅ）内周に嵌合し、前記仕切り部材（１２）の上面に取着されているダイヤフラム（８）の周縁部を突出部（20ａ）で押えてシールするように被着する。これにより第１副液室（９）が形成されるとともに、突出部（20ａ）外方の外筒金具（２）と仕切り部材（１２）およびカバー金具（２０）で囲まれた部分が第１のオリフィス（５）として設定される。
【００３８】
さらに、前記カバー金具（２０）の上に、ボス金具（１）が埋設一体化されている防振基体（３）を、前記カバー金具（２０）の周縁部を段部（２ｄ）との間に挾圧するように外筒金具（２）の筒状上部（２ｅ）に嵌着して、かしめ手段や絞り手段により固定する。これにより、防振基体（３）と仕切り部材（１２）の間を主液室（４）として、該主液室（４）、第１および第２のオリフィス（５）（６）、第１および第２の副液室（９）（１１）に液体が封入される。
【００３９】
特に第１および第２のオリフィス（５）（６）が相対する二つ以上の部材により形成されているために、前記のように液体に浸漬して組立てることにより、空気抜きが容易に確実に行なわれ、内部に空気が残存するおそれがない。なお、空気室（７）に侵入した液体は液槽から取出すことにより排出できる。
【００４０】
その後、空気中において、前記外筒金具（２）の上部（２ｅ）を、支持側の固定用ブラケット（２４）が固着され、かつ上端部がストッパ（２５）として形成されているスタビライザ（２３）の下部内周に圧入し、さらに前記空気室（７）から仕切り部材（１２）の内部を通り外筒金具（２）の側面の開口する連通路（１６）に対して、負圧源と大気圧源とに切替接続可能な切替手段（１７）に連結するための接続用パイプ（１９）を圧入する。この後、ボス金具（２）の上端
に取付金具（２７）を圧入手段等により固定することにより、図１に示す防振装置が得られる。
【００４１】
このように、第１および第２の２つのオリフィス（５）（６）および第１および第２の２つの副液室（９）（１１）を有し、液体通過抵抗の小さい第１のオリフィス（５）に連なる第１副液室（９）に隣接する空気室（７）の圧力調整により、第１副液室（９）側のダイヤフラム（８）の動き可動状態と不動状態に切替制御できるように構成した制御型の液封入防振装置を容易に組立て構成することができる。
【００４２】
【発明の効果】
上記したように本発明の制御型の液封入式防振装置によれば、圧力調整可能な空気室側のダイヤフラムを、仕切り部材の上面中央部の凹設部分の周辺部に形成された圧入用溝に対する環状のカラー金具の圧入によって仕切り部材の上面内方部にセンタ軸心と同心の配置にして設けたことにより、第１および第２のオリフィスを、主液室に対する出入口を共通にして、かついずれも外筒金具の内周に沿う周方向の流路が仕切り部材の上下で主液室のセンタ軸心と同心のドーナツ状をなすように設けることができ、またそのために、従来品に対して性能特性を低下させずに装置外径を小さく設計することが容易に可能になり、コンパクトで軽量な防振装置を得ることができる。しかも組立て時の空気抜きも簡単で組立て作業が容易であり、信頼性の高い防振装置をコスト安価に製造できる。
【００４３】
さらに、前記空気室から外筒金具の側外部に通じる連通路に対して接続用パイプを圧入したことにより、ガソリンやオイルを含んだ流通する気体による外筒金具内周のシールゴムの汚染や劣化を防止でき、さらに装置の信頼性を高めることができる。
【図面の簡単な説明】
【図１】本発明の制御型の液封入式防振装置の実施例を示す図２のＸ−Ｘ線の縦断面図である。
【図２】同上装置の平面図である。
【図３】仕切り部材とカラー金具付きのダイヤフラムを分離して示す一部欠截斜視図である。
【符号の説明】
（１）振動源側のボス金具
（２）支持側の外筒金具
（３）防振基体
（４）主液室
（５）第１のオリフィス
（６）第２のオリフィス
（７）空気室
（８）制御側ダイヤフラム
（９）第１副液室
（１０）ダイヤフラム
（１１）第２副液室
（１２）仕切り部材
（１３）シールゴム部
（６ａ）（６ｂ）オリフィス用凹部
（１５）カラー金具
（１６）連通路
（１７）切替手段
（１９）接続用パイプ
（２０）カバー金具
（20ａ）突出部
（２１）（２２）連通孔
（２３）スタビライザ
（２４）固定用ブラケット
（２５）ストッパ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a control type liquid-filled vibration isolator mainly used as an engine mount for automobiles.
[0002]
[Prior art and problems to be solved by the invention]
A liquid-filled vibration isolator as a mount that supports an automobile engine or the like so that its vibration is not transmitted to the vehicle body includes a main liquid chamber filled with liquid, a sub-liquid chamber having an air chamber partitioned by a diaphragm, and Are communicated by an orifice, and a vibration damping effect is obtained by this orifice.
[0003]
In recent years, as this type of liquid-filled vibration isolator, vibrations during engine shake and vibrations during idling are in different frequency ranges. For example, two orifices leading to the main liquid chamber are provided. Two sub liquid chambers each having a dedicated diaphragm are provided for each of the two chambers, and the pressure of an air chamber in contact with one of the two orifices connected to the orifice having a small liquid passage resistance (for example, having a large cross-sectional area) can be adjusted. Thus, when the diaphragm in contact with the air chamber can be controlled to be switched between a movable state and an immovable state according to the vibration state, an orifice having a large liquid passage resistance (for example, having a small cross-sectional area) is functioned. Stop the movement of the diaphragm so that the orifice with a large cross-sectional area does not function, What different switching-controlled hydraulic antivibration device so as to exhibit a sufficient damping effect on the vibrations in the frequency band it has been proposed. One example is JP-A-6-48188.
[0004]
In the proposed vibration isolator, the main liquid chamber in contact with the vibration isolating base and the diaphragm on the air chamber side that is adjustable in pressure, that is, the control side diaphragm, are arranged on the upper side with the partition member fitted to the outer cylinder fitting in the middle. A first sub-liquid chamber having a diaphragm on the atmosphere side is provided on the lower side.
[0005]
However, the diaphragm on the control side is vulcanized and bonded to the intermediate cylinder fitting, and is attached to the upper side of the partition member by fitting the intermediate cylinder fitting to the outer cylinder fitting. A partition metal fitting for forming an orifice is fitted to the first orifice to communicate with the first sub-liquid chamber, and a main metal fitting vulcanized and bonded to the outer periphery of the vibration-proof base is further fitted thereon. ing.
[0006]
That is, the first orifice that communicates with the first sub-liquid chamber is inside the intermediate tube fitting integrated with the diaphragm, and for this reason, the second orifice that communicates with the second sub-liquid chamber is the first orifice. And a common inlet / outlet for the main liquid chamber, and a hole shape penetrating the partition member must be formed.
[0007]
Therefore, in the proposed vibration isolator, it is difficult to design the outer diameter of the apparatus to be small without degrading the performance characteristics, and because of the presence of the intermediate tube fitting, the air in the orifice is extracted during assembly. There is a problem that it becomes difficult and takes time to assemble, resulting in high costs.
[0008]
The present invention has been made in view of the above, and it is easy to design an apparatus with a small outer diameter. Further, the air in the orifice can be easily removed during assembly, and the assembly is easy and reliable control. A liquid-filled vibration isolator of a mold is provided.
[0009]
[Means for Solving the Problems]
According to the first aspect of the present invention, there is provided an antivibration base made of a rubber elastic body interposed between a vibration source side metal fitting and a support side outer cylinder metal fitting, and the inside of the outer cylinder metal fitting below the vibration isolation base. The vibration base forms a part of the chamber wall, the main liquid chamber, the first and second orifices communicating with the main liquid chamber, and the air chamber or the outside connected to the first and second orifices. A control type liquid-filled vibration isolator having first and second sub liquid chambers having a diaphragm, and has the following configuration in order to solve the above-described problems.
[0010]
That is, a diaphragm is fixed to the lower part of the outer cylinder fitting in a sealed state, a partition member is fitted in a liquid-tight manner on the inner periphery of the outer cylinder fitting above the outer cylinder fitting, and a second gap is formed between the partition member and the diaphragm. A second orifice that is formed as a secondary liquid chamber and communicates from the second secondary liquid chamber to the main liquid chamber is formed between the outer cylinder and the outer cylinder by the concave portion of the outer peripheral portion of the partition member. A circular diaphragm is formed in which the central portion of the upper surface is recessed in a curved shape at the inner surface of the upper surface, a press-fitting groove is formed in the periphery of the recessed portion, and an annular collar fitting is fixed to the outer periphery. the is more center axis concentric disposed pressure inlet of the color fitting for press-fitting groove is attached so as to close the opening of the recessed portion becomes in, the said diaphragm between said partition member Hold clearance Because the projections are formed, between the diaphragm and the partition member is formed as a pressure adjustable air chamber from the outside, a cover fitting made of press-formed product formed in the lower surface of the projecting portion of the annular, The diaphragm is fitted and attached to the inner periphery of the outer cylinder bracket above the partition member so that the peripheral edge of the diaphragm is pressed and sealed by the protrusion , and the gap between the cover bracket and the diaphragm is the first. An annular portion defined by the outer cover fitting, the partition member, and the outer tube fitting is formed as a first orifice while being formed as one auxiliary liquid chamber, and the first orifice and the second orifice Means that the flow path in the circumferential direction along the inner periphery of the outer cylinder fitting is formed in a donut shape concentrically with the center axis at the upper and lower sides of the partition member with the same inlet / outlet with respect to the main liquid chamber The outer periphery of the anti-vibration base is liquid-tightly fitted to the outer cylinder fitting so that the outer edge of the cover fitting is pressed against the outer cylinder fitting. Features.
[0011]
According to the liquid-filled vibration isolator having this configuration, the pressure-adjustable diaphragm on the air chamber side is fixed by press- fitting the annular collar metal fitting on the outer periphery into the press-fitting groove at the inner surface of the upper surface of the partition member. Are arranged concentrically with the center axis, so that a first orifice can be formed between the cover fitting outside the diaphragm, the partition member, and the outer tube fitting. The second orifice having a common inlet / outlet with respect to the main liquid chamber can also be formed between the outer cylinder fitting by the concave portion of the outer peripheral portion of the partition member.
[0012]
That is, the first and second orifices have a common inlet / outlet with respect to the main liquid chamber, and the flow paths in the circumferential direction along the inner circumference of the outer cylinder fitting are arranged concentrically with the center axis at the top and bottom of the partition member. Therefore, the outer diameter of the apparatus can be designed smaller without degrading the performance characteristics of the conventional product. In addition, air can be easily removed during assembly, and assembly work is facilitated.
[0013]
According to a second aspect of the present invention, in the liquid-filled vibration isolator, the air chamber is connected to a negative pressure source and an atmospheric pressure source through a communication path that passes through the inside of the partition member and communicates with the outer side of the outer tube fitting. The connecting pipe is connected to switching means capable of switching connection, and a connecting pipe protruding outward from the outer cylinder fitting is press-fitted into the communication path.
[0014]
Thereby, it is possible to prevent contamination and deterioration of the seal rubber on the inner periphery of the outer cylinder fitting due to the flowing gas containing gasoline and oil.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
[0016]
FIG. 1 shows a control type liquid-filled vibration isolator according to an embodiment of the present invention, and FIG. 2 shows a plan view of the same.
[0017]
In the figure, (1) is a vibration-source-side boss fitting to which a vibration source such as an automobile engine is attached, and (2) is a support-side outer tubular fitting to be attached to a chassis, a frame, etc. I am doing.
[0018]
(3) is a thick anti-vibration base made of a rubber elastic body that receives a load on the vibration source side, and has a substantially umbrella-shaped curved shape as shown in the figure. The boss fitting (1) is vulcanized and bonded in a partially embedded state. A reinforcing metal fitting (3a) is vulcanized and bonded to the lower outer periphery of the vibration isolating base (3), and the reinforcing metal fitting (3a) is fitted to the upper inner periphery of the outer cylinder metal fitting (2) as described later. It is interposed between the boss fitting (1) and the outer tube fitting (2).
[0019]
A main liquid chamber (4) in which the vibration isolating base (3) forms part of a chamber wall and a main liquid chamber (4) are provided inside the outer cylindrical fitting (2) below the vibration isolating base (3). And the first and second orifices (5) and (6) having different liquid passage resistances and the first orifice (5) having a small liquid passage resistance (large cross-sectional area) and an air chamber (7 Between the first sub-liquid chamber (9) having a diaphragm (8) and a second orifice (6) having a larger liquid passage resistance (smaller cross-sectional area) and the outside. And a second sub-liquid chamber (11) having a diaphragm (10) separating them.
[0020]
(12) is a partition member that is liquid-tightly fitted to the intermediate cylinder part (2a) of the outer cylinder fitting (2) via a seal rubber part (13). A space between the partition member (12) and the anti-vibration base (3) is formed as a main liquid chamber (4) enclosing a liquid, and the first sub liquid chamber (9) is located above the partition member (12). The second sub liquid chamber (11) is provided below the partition member (12).
[0021]
That is, in the slightly lower-diameter cylindrical lower part (2c) that is continuous to the intermediate cylinder part (2a) of the outer cylinder fitting (2) via the step part (2b), the chamber of the second sub liquid chamber (11) is provided. A diaphragm (10) made of a rubber film forming a part of the wall is fixed to the sealing rubber portion (13) on the inner periphery of the outer tube fitting (2) by a vulcanizing adhesive means. And the peripheral part lower end (12a) of the said partition member (12) contact | abuts to the said step part (2b), and between the inner partition member (12) and the said diaphragm (10) is 2nd subliquid. It is formed as a chamber (11) and is separated from the atmosphere by a diaphragm (10).
[0022]
Further, a longitudinal groove-like recess (6a) and a circumferential recess (6b) continuous to the recess (6a) are formed on the outer peripheral portion of the partition member (12), and the outer cylinder fitting (2 ) Is formed as a second orifice (6) along the outer cylinder fitting (2), and the second sub liquid chamber (6c) is formed by the communication hole (6c). 11).
[0023]
A diaphragm (8) formed by fixing an annular collar fitting (15) to the outer peripheral portion by vulcanization bonding means is press-fitted into the collar fitting (15) on the inner side of the upper surface of the partition member (12). The diaphragm (8) and the partition member (12) are formed as a pressure-adjustable air chamber (7) having a predetermined clearance between the diaphragm (8) and the partition member (12). . (8a) is a protrusion for maintaining a certain clearance or more.
[0024]
In the present invention, as shown in the figure, the central portion of the upper surface corresponding to the air chamber (7) of the partition member (12) is recessed in a curved shape and is press-fitted into the peripheral portion of the recessed portion (12b). The groove (12c) is formed, and the diaphragm (8) is pressed so that the collar fitting (15) is press- fitted into the press-fitting groove (12c), thereby closing the opening of the recessed portion (12b). It is worn. FIG. 3 shows the partition member (12) and the diaphragm (8) with the collar fitting separately.
[0025]
The air chamber (7) is connected to either the negative pressure source or the atmospheric pressure source through a communication passage (16) that passes through the inside of the partition member (12) and communicates from the side surface to the outside of the outer tube fitting (2). It is connected to switching means (17) such as a switchable connection valve so that either negative pressure or atmospheric pressure can be introduced into the switching means (17) by operating a command signal from the control means (18). It has become.
[0026]
Accordingly, the diaphragm (8) can be switched between a movable state and a non-movable state, and when the second orifice (6) having a large liquid passage resistance is caused to function, the diaphragm (8) is stopped and stopped. The first orifice (5) having a large area is prevented from functioning, and the respective orifices (5) and (6) can exhibit a sufficient damping effect against vibrations in different frequency bands.
[0027]
(19) shows a connection pipe press-fitted into the communication path (16), which protrudes from the outer cylinder fitting (2). As a result, it is possible to prevent contamination and deterioration of the seal rubber on the inner periphery of the outer cylinder fitting (2) due to the flowing gas containing gasoline and oil.
[0028]
On the side of the main liquid chamber (4) of said partition member (12), the cover also serves as a press-molded article by Li Cheng orifice forming member from a steel sheet to form protruding portions of the annular shape (20a) on the lower surface or the like fittings (20) However, the diaphragm (8) is fitted in a liquid-tight manner on the inner periphery of the outer tube fitting (2) so that the peripheral edge (8a) of the diaphragm (8a) is pressed and sealed by the protrusion (20a). Yes. As a result, a space between the protrusion (20a) and the inner diaphragm (8) is formed as a first sub liquid chamber (9), and the outer cover fitting (20) and the partition member (12) are further formed. and an annular space portion that is bounded by the outer sleeve (2), the communication hole (21) and relatively sectional communicating to said main liquid chamber (4) and the first sub-liquid chamber (9) by (22) It is formed as a first orifice (5) having a large area. The second orifice (6) communicates with the main liquid chamber (4) through the communication hole (21) of the first orifice (5).
[0029]
That is, the first orifice (5) and the second orifice (6) have a common inlet / outlet with respect to the main liquid chamber (4) and are provided along the inner periphery of the outer tube fitting (2). Thus, the circumferential flow paths positioned above and below the partition member (12) are provided so as to form a donut shape concentrically with the center axis of the main liquid chamber (4). The diaphragm (8) in contact with the air chamber (7) is also concentric with respect to the center axis.
[0030]
Furthermore, the large-diameter cylindrical upper part (2e) which continues through the intermediate cylinder part (2a) and the step part (2d) of the outer cylinder metal fitting (2) is a reinforcing metal fitting on the outer periphery of the antivibration base (3) ( 3a) is liquid-tightly fitted and fixed by caulking means or throttling means. Further, by fixing the anti-vibration base (3) as described above, the peripheral portion of the cover metal fitting (20) is fixed by being pressed between the stepped portion (2d).
[0031]
Further, (23) in the figure is a cylindrical stabilizer having a support-side fixing bracket (24) fixed to the outer periphery, and the upper part (2e) of the outer cylinder fitting (2) is press-fitted into the lower inner periphery thereof. Has been fixed.
[0032]
The stabilizer (23) has an upper end extending upward from the stopper flange (1a) of the boss metal fitting (1), an upper end is bent inward, and an inner end thereof is a stopper ( 25). A stopper rubber portion (1b) is attached to the upper surface of the flange portion (1a). When an upward displacement occurs, the stopper rubber portion (1b) abuts on the stopper (25) upward, and further upwards. Large displacement can be suppressed. (27) is a vibration-source-side mounting bracket fixed to the upper end of the boss bracket (1) by press-fitting means or the like. The mounting bracket (27) has a skirt-like cover rubber portion (27b) by vulcanization bonding means. A stopper rubber part (27a) integrated with the stopper (25a) is attached, and can be brought into contact with the stopper (25) at the time of large downward displacement so that a stopper action can be achieved.
[0033]
In FIG. 1, the stopper rubber portion (1b) is shown in contact with the stopper (25). However, when the load of the engine or the like is applied, the vibration-proof base (3) is elastically deformed and is moved downward. And a predetermined clearance is held between the stopper (25) and the upper and lower stopper rubber portions (27a) (1b).
[0034]
The liquid filled type vibration damping device having the above configuration is assembled and configured as follows.
[0035]
First, the collar fitting (15) fixed to the outer peripheral portion of the diaphragm (8) is press-fitted into the press-fitting groove (12c) around the recessed portion (12b) on the upper surface of the partition member (12), It attaches so that the predetermined clearance as an air chamber (7) may be kept between a partition member (12) and a diaphragm (8). In this partition member (12), longitudinal and circumferential recesses (6a) and (6b) to be the second orifice (6) are formed on the outer periphery, and a communication path (from the recessed portion on the upper surface to the side surface) 16) is formed.
[0036]
Next, in the liquid tank, the partition member (12) is connected to the intermediate cylinder portion of the outer tube fitting (2) in which the diaphragm (10) is integrally vulcanized and bonded together with the seal rubber portion (13) on the lower inner periphery. It is press-fitted into (2a) from above, in particular, to a position where it abuts on the stepped portion (2b), and is fitted in a liquid-tight manner through the seal rubber portion (13). At this time, the communication passage (16) opened on the side surface of the partition member (12) is aligned with the position of the opening (16a) having the intermediate cylinder portion (2a). As a result, the portion surrounded by the partition member (12) and the diaphragm (10) serves as the second auxiliary liquid chamber (11), and the concave portions (6a) (6b) follow the outer tube fitting (2). Formed as a second orifice (6).
[0037]
Next, the cover metal fitting (20) that also serves as the orifice forming member is fitted to the inner periphery of the cylindrical upper part (2e) of the outer cylinder metal fitting (2), and the diaphragm attached to the upper surface of the partition member (12) ( 8) Adhere the peripheral edge of 8) with the protrusion (20a) to seal it. As a result, the first auxiliary liquid chamber (9) is formed, and the portion surrounded by the outer cylindrical metal fitting (2), the partition member (12), and the cover metal fitting (20) on the outside of the protrusion (20a) is the first. The orifice (5) is set.
[0038]
Further, the vibration isolator base (3) in which the boss metal fitting (1) is embedded and integrated on the cover metal fitting (20), and the peripheral edge of the cover metal fitting (20) between the step portion (2d). It is fitted to the cylindrical upper part (2e) of the outer cylinder fitting (2) so as to be pressed against the outer periphery, and is fixed by caulking means or throttling means. Thus, the main liquid chamber (4), the first and second orifices (5) and (6), the first liquid chamber (4), the first liquid chamber (4), the first orifice (5) (6), and the first And a liquid is enclosed with the 2nd sub liquid chamber (9) (11).
[0039]
In particular, since the first and second orifices (5) and (6) are formed by two or more members facing each other, air is easily and surely removed by being immersed in the liquid as described above. There is no risk of air remaining inside. The liquid that has entered the air chamber (7) can be discharged by taking it out of the liquid tank.
[0040]
Thereafter, in the air, the stabilizer (23) in which the support bracket (24) is fixed to the upper part (2e) of the outer tube fitting (2) and the upper end is formed as a stopper (25). The negative pressure source is connected to the communication path (16) that is press-fitted into the inner periphery of the lower part of the pipe and passes through the inside of the partition member (12) from the air chamber (7) and opens on the side surface of the outer tube fitting (2). A connecting pipe (19) for connecting to a switching means (17) that can be switched to a pressure source is press-fitted. Thereafter, the vibration isolator shown in FIG. 1 is obtained by fixing the mounting bracket (27) to the upper end of the boss bracket (2) by press-fitting means or the like.
[0041]
Thus, the first orifice having the first and second orifices (5) (6) and the first and second sub liquid chambers (9) (11) and having a low liquid passage resistance. By switching the pressure of the air chamber (7) adjacent to the first sub liquid chamber (9) connected to (5), the diaphragm (8) on the first sub liquid chamber (9) side is switched between a movable state and a non-moving state. The control-type liquid-filled vibration isolator configured as described above can be easily assembled and configured.
[0042]
【The invention's effect】
As described above, according to the control-type liquid-filled vibration isolator of the present invention, the pressure-adjustable air chamber-side diaphragm is formed on the periphery of the recessed portion at the center of the upper surface of the partition member. The first and second orifices are provided in common at the inlet and outlet for the main liquid chamber by providing a concentric arrangement with the center axis at the inner surface of the upper surface of the partition member by press- fitting an annular collar fitting into the groove . In both cases, the circumferential flow path along the inner periphery of the outer cylinder fitting can be provided so as to form a donut shape concentric with the center axis of the main liquid chamber above and below the partition member. On the other hand, it is possible to easily design an apparatus with a small outer diameter without degrading performance characteristics, and a compact and lightweight vibration isolator can be obtained. In addition, air removal during assembly is simple and easy to assemble, and a highly reliable vibration isolator can be manufactured at low cost.
[0043]
In addition, by connecting the connecting pipe into the communication passage that leads from the air chamber to the outside of the outer cylinder fitting, contamination and deterioration of the seal rubber on the inner circumference of the outer cylinder fitting due to the flowing gas containing gasoline and oil are prevented. And the reliability of the apparatus can be increased.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view taken along line XX of FIG. 2 showing an embodiment of a control type liquid-filled vibration isolator of the present invention.
FIG. 2 is a plan view of the apparatus.
FIG. 3 is a partially cutaway perspective view showing a partition member and a diaphragm with a collar fitting separately.
[Explanation of symbols]
(1) Vibration source side boss bracket (2) Support side outer cylinder bracket (3) Anti-vibration base (4) Main liquid chamber (5) First orifice (6) Second orifice (7) Air chamber ( 8) Control side diaphragm (9) First sub liquid chamber (10) Diaphragm (11) Second sub liquid chamber (12) Partition member (13) Seal rubber part (6a) (6b) Orifice recess (15) Color fitting ( 16) Communication path (17) Switching means (19) Connection pipe (20) Cover bracket (20a) Projection (21) (22) Communication hole (23) Stabilizer (24) Fixing bracket (25) Stopper

Claims

In the vibration-proof base made of a rubber elastic body interposed between the vibration-source-side metal fitting and the support-side outer cylinder metal fitting, and inside the outer cylinder metal fitting below the vibration-proof substrate, the vibration-proof substrate is one of the chamber walls. And a first and second orifices communicating with the main liquid chamber, and a diaphragm connected to the first and second orifices and having a diaphragm separating the air chamber or the outside. A liquid-filled vibration isolator comprising a second sub liquid chamber,
A diaphragm is fixed to the lower part of the outer cylinder fitting in a sealed state, a partition member is fitted in a liquid-tight manner on the inner periphery of the outer cylinder fitting above the outer cylinder fitting, and a second sub-liquid is formed between the partition member and the diaphragm. And a second orifice that leads from the second sub liquid chamber to the main liquid chamber is formed between the outer cylinder fitting by the concave portion of the outer peripheral portion of the partition member,
Further, in the inner surface of the upper surface of the partition member, the central portion of the upper surface is recessed in a curved shape, and a press-fitting groove is formed in the peripheral portion of the recessed portion, and an annular collar is fixed on the outer periphery. circular diaphragm made is made and is attached so as to close the opening of the recessed portion in a more center axis concentric disposed pressure input prior Symbol color fitting to said press-fit groove, the to the diaphragm A protrusion for maintaining a clearance is formed between the partition member and the diaphragm and the partition member are formed as an air chamber whose pressure can be adjusted from the outside.
A cover fitting made of a press-molded product having an annular protrusion formed on the lower surface is liquid-tight on the inner periphery of the outer cylinder bracket above the partition member so that the peripheral edge of the diaphragm is pressed and sealed by the protrusion. The cover fitting and the diaphragm are formed as a first auxiliary liquid chamber, and an annular portion defined by the outer cover fitting, the partition member, and the outer cylinder fitting is a first portion. Formed as one orifice,
The first orifice and the second orifice have a common inlet / outlet with respect to the main liquid chamber, and the flow path in the circumferential direction along the inner periphery of the outer cylinder fitting is arranged concentrically with the center axis at the top and bottom of the partition member. It is formed to make a donut shape by
Further, the outer peripheral portion of the vibration-proof base is liquid-tightly fitted to the outer cylinder fitting so that the outer peripheral end of the cover fitting is pressed against the outer cylinder fitting. Control type liquid-filled vibration isolator.

The air chamber is connected to switching means that can be switched and connected to a negative pressure source and an atmospheric pressure source through a communication path that passes through the inside of the partition member and communicates with the outside of the outer tube fitting. 2. The control-type liquid-filled vibration isolator according to claim 1, wherein a connecting pipe protruding outward from the cylindrical metal fitting is press-fitted.