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JP3899981B2 - Fluid filled vibration isolator - Google Patents

Fluid filled vibration isolator Download PDF

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Publication number
JP3899981B2
JP3899981B2 JP2002096670A JP2002096670A JP3899981B2 JP 3899981 B2 JP3899981 B2 JP 3899981B2 JP 2002096670 A JP2002096670 A JP 2002096670A JP 2002096670 A JP2002096670 A JP 2002096670A JP 3899981 B2 JP3899981 B2 JP 3899981B2
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rubber elastic
partition member
partition
fluid
chamber
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JP2003294081A (en
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彰治 赤佐
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Sumitomo Riko Co Ltd
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Sumitomo Riko Co Ltd
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Description

【０００１】
【技術分野】
本発明は、内部に封入された非圧縮性流体の共振作用等の流動作用に基づいて防振効果を得るようにした流体封入式防振装置に係り、特に振動が入力される受圧室に対して第一のオリフィス通路を通じて接続された平衡室と、該受圧室に対して第二のオリフィス通路を通じて接続された副液室とを併せ備えており、それら第一のオリフィス通路と第二のオリフィス通路を流動せしめられる流体の流動作用に基づき、異なる周波数域の振動に対してそれぞれ防振効果を得るようにした流体封入式防振装置に関するものである。
【０００２】
【背景技術】
従来から、自動車用エンジンマウントやボデーマウント等のように、振動伝達系を構成する部材間に介装される防振連結体や防振支持体の一種として、特開平４−３５７３４４号公報や特開平１０−１８４７７５号公報等に記載されているように、振動入力に際して弾性変形せしめられる本体ゴム弾性体によって壁部の一部が構成された受圧室と、壁部の一部がゴム弾性板で構成された副液室と、壁部の一部が可撓性膜で構成された平衡室を設けて、それら各室に非圧縮性流体を封入すると共に、受圧室と平衡室を接続する第一のオリフィス通路と、受圧室と副液室を接続する第二のオリフィス通路を設けた構造の流体封入式防振装置が知られている。かかる流体封入式防振装置においては、第一のオリフィス通路と第二のオリフィス通路を異なる周波数域にチューニングすることにより、第一のオリフィス通路と第二のオリフィス通路をそれぞれ流動せしめられる流体の共振作用に基づいて互いに異なる周波数の振動に対して有効な防振効果を得ることが出来るのである。
【０００３】
ところで、このような流体封入式防振装置においては、第一のオリフィス通路および第二のオリフィス通路の長さを大きく設定可能としてチューニング自由度を十分に確保しつつ、受圧室や副液室，平衡室，第一のオリフィス通路および第二のオリフィス通路を、少ない部品点数と簡単な構造で形成することが要求される。
【０００４】
しかしながら、従来構造の流体封入式防振装置にあっては、前記公報にも記載されているように、仕切部材や可動膜の配設および支持構造を含めて第一及び第二のオリフィス通路の構造が複雑で、部品点数も多く、そのために製造が面倒で製造コストも高くなるという問題があった。
【０００５】
なお、このような問題に対処するために、本出願人は、先に、特開平１１−２６４４３６号公報において、ゴム弾性板の外周面に円筒形状の固定金具を加硫接着せしめて、該固定金具によりゴム弾性板の外周縁部を仕切部材に対して固定的に支持せしめると共に、該固定金具を利用してオリフィス通路を形成するようにした構造の流体封入式防振装置を提案した。ところが、かかる先の出願のものにおいても、ゴム弾性板に加硫接着される固定金具の形状が複雑となって製造や組付けが難しくなったり、オリフィス通路を形成するに際して固定金具に組み付けられるオリフィス形成用の金具が複数必要となったりする不具合があり、未だ、改良の余地があった。
【０００６】
【解決課題】
ここにおいて、本発明は、上述の如き事情を背景として為されたものであって、その解決課題とするところは、第一及び第二のオリフィス通路のチューニング自由度を十分に確保しつつ、受圧室や副液室，平衡室，第一のオリフィス通路および第二のオリフィス通路を、少ない部品点数と簡単な構造で形成することの出来る、改良された構造の流体封入式防振装置を提供することにある。
【０００７】
【解決手段】
以下、このような課題を解決するために為された本発明の態様を記載する。なお、以下に記載の各態様において採用される構成要素は、可能な限り任意の組み合わせで採用可能である。また、本発明の態様乃至は技術的特徴は、以下に記載のものに限定されることなく、明細書全体および図面に記載され、或いはそれらの記載から当業者が把握することの出来る発明思想に基づいて認識されるものであることが理解されるべきである。
【０００８】
本発明の第一の態様は、第一の取付部材を略円筒形状を有する第二の取付部材の軸方向一方の開口部側に離隔配置せしめて、それら第一の取付部材と第二の取付部材を本体ゴム弾性体で連結すると共に、該第二の取付部材で支持せしめた仕切部材を該本体ゴム弾性体に対向配置して、該仕切部材の該本体ゴム弾性体に対する対向面側にゴム弾性板を変形可能に配設支持せしめ、該本体ゴム弾性体と該ゴム弾性板の対向面間に隔壁部材を配設して該第二の取付部材で支持せしめることにより、該隔壁部材を挟んだ一方の側に該本体ゴム弾性体で壁部の一部が構成された受圧室を形成すると共に、該隔壁部材を挟んだ他方の側に該ゴム弾性板で壁部の一部が構成された副液室を形成する一方、前記仕切部材を挟んで該受圧室や該副液室と反対側に壁部の一部が可撓性ゴム膜で構成された平衡室を形成し、それら受圧室と副液室および平衡室に非圧縮性流体を封入すると共に、該受圧室を該平衡室に接続する第一のオリフィス通路と、該受圧室を該副液室に接続する第二のオリフィス通路を形成した流体封入式防振装置において、前記仕切部材の前記本体ゴム弾性体への対向面に支持突部を設ける一方、前記ゴム弾性板の外周面に円筒形状の固定スリーブを加硫接着して、該固定スリーブの軸方向一方の開口端部を該支持突部に外嵌固定することにより、該ゴム弾性板の外周縁部を該仕切部材によって支持せしめると共に、前記隔壁部材を略ハット形状として該仕切部材に向かって開口する周壁の開口周縁部に鍔状部を形成して、該隔壁部材の周壁を該仕切部材から突出せしめられた該固定スリーブの軸方向先端部分に外嵌固定せしめ、該固定スリーブの軸方向中間部分で該鍔状部を広がるように該鍔状部を該仕切部材から離隔位置せしめると共に、前記第二の取付部材の内周面にシールゴム層を被着形成し、該隔壁部材における該鍔状部の外周縁部を該シールゴム層を介して該第二の取付部材に当接させて、それら鍔状部と仕切部材の対向面間で該固定スリーブの外周側を周方向に延びるようにして前記第二のオリフィス通路を形成したことを、特徴とする。
【０００９】
このような本態様に従う構造とされた流体封入式防振装置においては、仕切部材に突設した支持突部に対して、ゴム弾性板に固着された固定スリーブを外嵌固定すると共に、該固定スリーブに対して隔壁部材を外嵌固定することによって一体的な組付体が構成されることとなる。そして、この組付体を第二の取付部材に組み付けることによって、本体ゴム弾性体とゴム弾性板の対向面間が隔壁部材で流体密に仕切られて、本体ゴム弾性体と隔壁部材の間に受圧室が形成されると共に、隔壁部材とゴム弾性板の間に副液室が形成されることとなり、更に、隔壁部材と仕切部材の対向面間には、ゴム弾性板の外周側を周方向に延びるようにして第二のオリフィス通路が形成されることとなる。
【００１０】
従って、このような流体封入式防振装置においては、受圧室や副液室および第二のオリフィス通路などを、少ない部品点数によって効率的に形成することが出来るのであり、しかも、仕切部材に対してゴム弾性板を備えた固定スリーブや隔壁部材を予め固定的に組み付けて組付体とした後、かかる組付体を第二の取付部材に対して組み付けることが出来ることから、製造も容易となるのである。
【００１１】
なお、本態様において、仕切部材は、支持突部が一体形成されていることが望ましく、好適には合成樹脂材やアルミニウム合金等の金属材などによって型成形されたものが採用される。また、固定スリーブとしては、金属製筒体が好適に採用され得、それによって、製造が容易で低コスト化が図られることに加えて、固定スリーブをゴム弾性板に対して接着で強固に固着することが出来ると共に、絞り加工やかしめ加工により仕切部材の支持突部に対して容易に且つ強固に外嵌固定することが可能となる。更にまた、隔壁部材は、合成樹脂材等で形成しても良いが、プレス金具で形成したものが望ましく、それによって、固定スリーブに対する外嵌固定部位におけるシール性や固定強度を一層有利に得ることが出来る。
【００１２】
また、本発明の前記第一の態様に係る流体封入式防振装置においては、前記第二の取付部材の内周面に前記シールゴム層を被着形成して、該シールゴム層を介して該第二の取付部材を前記仕切部材の外周面に嵌着固定すると共に、前記隔壁部材における前記鍔状部の外周縁部を該シールゴム層を介して該第二の取付部材に当接させる態様が、好適に採用され得る。このような本態様においては、隔壁部材を、簡単な構造で高いシール性をもって、第二の取付部材に対して組み付けることが可能となる。特に本態様においては、ゴム弾性板に固着された固定スリーブの支持突部に対する外嵌固定と、該固定スリーブに対する隔壁部材の外嵌固定に加えて、該隔壁部材の外周縁部の第二の取付部材に対する当接固定までも、径方向での固定力で実現されることから、それら各部材間の固定部位における固定力とシール性を一層容易に且つ高度に得ることが可能となる。
【００１３】
また、本発明の第二の態様は、前記第一の態様に係る流体封入式防振装置において、互いに嵌着固定された前記固定スリーブと前記隔壁部材の周壁を周上の適当な箇所で離隔させることにより、該固定スリーブの外周側に形成された前記第二のオリフィス通路を前記副液室に連通せしめる副液室側連通孔を形成したことを、特徴とする。このような本態様においては、ゴム弾性板に対して切欠き等の異形部分を設けることなく、第二のオリフィス通路の副液室への連通路を有利に形成することが可能となる。
【００１４】
また、本発明の第三の態様は、前記第二の態様に係る流体封入式防振装置において、前記隔壁部材の周壁を周上の適当な箇所で外周側に膨らませて径方向突部を形成し、該径方向突部を前記固定スリーブから離隔させることにより前記副液室側連通孔を形成すると共に、該径方向突部の周壁にエア抜孔を貫設し、且つ該隔壁部材の前記第二の取付部材への組み付けによって該エア抜孔が該第二の取付部材で覆蓋されるようにしたことを、特徴とする。このような本態様においては、仕切部材に対するゴム弾性板を備えた固定スリーブや隔壁部材の組み付けを大気中で行なった後、かかる組付体を非圧縮性流体中に浸漬して非圧縮性流体中で第二の取付部材に組み付けるに際して、組付体に残存する残留エアを、エア抜孔を通じて容易に排出することが出来る。しかも、組付体の第二の取付部材への組付完了に際して、特別な作業を必要とすることなく、隔壁部材の第二の取付部材への組付けに伴って径方向突部のエア抜孔の開口部に第二の取付部材が重ね合わされて該エア抜孔が覆蓋されることから、エア抜孔によるオリフィス通路の短絡等が問題となることもなく、オリフィス通路を流動せしめられる流体の流動作用に基づく防振効果も、安定して有効に発揮され得るのである。
【００１５】
また、本発明の第四の態様は、前記第三の態様に係る流体封入式防振装置において、前記隔壁部材において軸直角方向で略対向位置する部分に前記径方向突部を一対形成すると共に、それら各径方向突部に前記エア抜孔を設けたことを、特徴とする。即ち、前記第三の態様においてエア抜孔を複数設けることは、一方のエア抜孔から噴流を吹き付けて他方のエア抜孔から残留エアを一層効率的に速やかに排出させる上に望ましく、より好適には、本態様の如く、一対のエア抜孔を隔壁部材の径方向で対向位置するように形成することが望ましく、それによって残留エアの排出効率の向上が図られ得る。
【００１６】
また、本発明の第五の態様は、前記第二乃至第四の何れかの態様に係る流体封入式防振装置において、前記隔壁部材の前記鍔状部と前記仕切部材との対向面間に周方向の全周に亘って連続して延びる環状通路を設けて、該環状通路の径方向で対向位置する部分に、該鍔状部を貫通して該環状通路を前記受圧室に連通せしめる受圧室側連通孔と、前記仕切部材を貫通して該環状通路を前記平衡室に連通せしめる平衡室側連通孔を形成することにより、それら受圧室側連通孔と環状通路および平衡室側連通孔によって前記第一のオリフィス通路を形成する一方、該環状通路における該受圧室側連通孔と該平衡室側連通孔の対向方向に略直交する径方向で対向する位置において、それぞれ、互いに嵌着固定された前記固定スリーブと前記隔壁部材の周壁を離隔せしめ前記副液室側連通孔を一対形成することにより、該受圧室側連通孔から該環状通路を周方向両側に分流してかかる一対の副液室側連通孔を通じて前記副液室に至る形態をもって前記第二のオリフィス通路を形成したことを、特徴とする。
【００１７】
このような本態様においては、固定スリーブの外周を延びる環状通路を利用してそれぞれ四半周の長さで並列的に形成された一対の流路部分により一つの第二のオリフィス通路が形成されるのであり、それ故、例えば隔壁部材の鍔状部と仕切部材の対向面間距離が小さい場合でも、第二のオリフィス通路の通路断面積を実質的に大きく設定することが可能となる。また、第一のオリフィス通路も、第二のオリフィス通路を一部に含んで利用するようにして、優れたスペース効率をもって、有効な通路長さと通路断面積を確保しつつ、有利に形成され得る。なお、例えば、平衡室側連通孔の平衡室側の開口には、仕切部材の外周面に開口する凹溝を第二の取付部材で覆蓋することで形成される流路が含まれていることが望ましく、それによって、かかる流路で第一のオリフィス通路の一部を構成することが可能となり、第一のオリフィス通路の長さの設定範囲が一層大きくなる。
【００１８】
また、前記第一乃至第五の何れかの態様に係る流体封入式防振装置において、ゴム弾性板を挟んで副液室と反対側には、例えば平衡室を形成する他、外部空間に対して密閉された空気室を形成することも可能である。このような空気室を備えた流体封入式防振装置では、例えば、空気室に対して外部から空気圧を及ぼすための空気通路を形成して、かかる空気通路を通じて、空気室の圧力を、防振すべき振動の入力状態等に応じて能動的乃至は積極的に調節することにより、防振特性を制御することが可能となる。また、ゴム弾性板を挟んで副液室と反対側に平衡室を形成すれば、複雑な空気圧の制御装置等を必要としない簡単な構造をもって、第一のオリフィス通路による防振効果と第二のオリフィス通路による防振効果を、互いに異なる周波数域でそれぞれ容易に且つ有効に得ることの出来る流体封入式防振装置が有利に実現され得る。
【００１９】
また、本発明の第六の態様は、前記第一乃至第五の何れかの態様に係る流体封入式防振装置において、前記本体ゴム弾性体の外周部分に前記第二の取付部材の軸方向一方の開口部分を加硫接着すると共に、前記可撓性ゴム膜の外周部分に支持筒部材の軸方向一方の開口部分を加硫接着せしめて、それら第二の取付部材と支持筒部材におけるそれぞれの軸方向他方の開口部分を前記仕切部材の軸方向両側から外嵌固定したことを、特徴とする。このような本態様においては、第二の取付部材を本体ゴム弾性体に対して直接に加硫接着することが出来るのであり、その結果、本体ゴム弾性体に第二の取付部材を固定するための特別な部材が不要となって、製造が容易となると共に、本体ゴム弾性体と第二の取付部材間での非圧縮性流体の漏れも極めて高度に防止され得る。
【００２０】
【発明の実施形態】
以下、本発明を更に具体的に明らかにするために、本発明の実施形態について、図面を参照しつつ、詳細に説明する。
【００２１】
先ず、図１には、本発明の第一の実施形態としての自動車用エンジンマウント１０が示されている。このエンジンマウント１０は、第一の取付部材としての第一の取付金具１２と第二の取付部材としての第二の取付金具１４が離隔配置されていると共に、それら第一の取付金具１２と第二の取付金具１４が本体ゴム弾性体１６で弾性連結された構造を有しており、第一の取付金具１２が自動車のパワーユニット側に取り付けられる一方、第二の取付金具１４が自動車のボデー側に取り付けられることによって、パワーユニットをボデーに対して防振支持せしめるようになっている。なお、以下の説明において、上下方向とは、原則として、図１中の上下方向をいうものとする。
【００２２】
より詳細には、第一の取付金具１２は、略逆円錐台形状を有しており、その大径側端部には、軸方向上方に向かって突出するナット部１８が一体形成されている。そして、ナット部１８のねじ穴２０に螺着される図示しないボルトにより、第一の取付金具１２がパワーユニット側に取り付けられるようになっている。
【００２３】
一方、第二の取付金具１４は、全体として大径の段付円筒形状を有しており、軸方向中間部分に形成された段差部２２を挟んで軸方向上側が大径部２４とされていると共に、軸方向下側が小径部２６とされている。また、第二の取付金具１４における小径部２６側の開口端縁部には、径方向内方に向かって屈曲されて僅かに突出する係止突部２８が、周方向に連続した円環形状で一体形成されている。なお、このような第二の取付金具１４は、プレス加工によって有利に製造することが出来、それによって、係止突部２８を容易に形成することが可能となる。即ち、ブランクを所定の軸方向長さを有する有底円筒形状に絞り加工した後、底部中央部分を打抜加工することによって、係止突部２８を形成することが出来るのである。そして、第二の取付金具１４は、図示しない筒状のブラケット金具に圧入固定されて、該ブラケット金具を介して、ボデー側に取り付けられるようになっている。
【００２４】
また、このような第二の取付金具１４の大径部２４側に離隔して、第一の取付金具１２が略同一中心軸上で対向配置されており、それら第一の取付金具１２と第二の取付金具１４が、本体ゴム弾性体１６によって弾性的に連結されている。
【００２５】
この本体ゴム弾性体１６は、大径の略円錐台形状を有しており、大径側端面には、中央部分に開口する略すり鉢状の凹所３０が形成されている。そして、本体ゴム弾性体１６の小径側端部に対して第一の取付金具１２が軸方向に差し込まれた状態で加硫接着されていると共に、本体ゴム弾性体１６の大径側端部の外周面に対して第二の取付金具１４の大径部２４の内周面が加硫接着されており、第二の取付金具１４の大径部２４側の開口部が本体ゴム弾性体１６によって流体密に閉塞されている。また、第二の取付金具１４の小径部２６の内周面には、全体に亘って、本体ゴム弾性体１６と一体形成されたシールゴム層３２が被着されている。なお、このことから明らかなように、本実施形態では、本体ゴム弾性体１６が、第一及び第二の取付金具１２，１４を備えた一体加硫成形品として形成されている。
【００２６】
また、第二の取付金具１４の小径部２６側の開口部には、仕切部材３６が組み付けられている。この仕切部材３６は、硬質の合成樹脂材や金属材等の硬質材によって形成されており、全体として円形ブロック形状を呈している。また、仕切部材３６の外周面には、軸方向中間部分において、径方向外方に僅かに突出する位置決め突起３８が、軸方向に略一定の幅寸法で周方向の全周に亘って連続して延びるように一体形成されており、この位置決め突起３８を軸方向に挟んだ両側において、第一の周溝４０と第二の周溝４２が形成されている。これら第一及び第二の周溝４０，４２は、何れも、仕切部材３６の外周面に開口して略一定の幅寸法で全周に亘って周方向に延びるように形成されている。
【００２７】
更にまた、仕切部材３６の軸方向上端面の中央には、上方に向かって開口する略すり鉢状の上側凹所４６が形成されており、後述する作用空気室７８の容積がこの上側凹所４６で有利に確保されるようになっている。また、上側凹所４６の開口周縁部は、上方に向かって突出せしめられており、以て、仕切部材３６の上端面において、支持突部としての環状突部４４が、上方に向かって突出する円環形状をもって形成されている。更に、この環状突部４４には、その基端部において外周面に開口して略一定の幅寸法で全周に亘って延びる係合溝４８が形成されている。また一方、仕切部材３６の軸方向下端面には、中央部分に開口する下側凹所５０が形成されており、後述する平衡室１２４の容積がこの下側凹所５０で有利に確保されるようになっている。
【００２８】
また、仕切部材３６には、環状突部４４よりも軸方向下方に位置する部分において、外周面に開口して周方向に所定長さで延びる外周凹溝５８が形成されていると共に、この外周凹溝５８の周方向一方の端部が、仕切部材３６内を軸方向に延びる通孔６０を通じて、仕切部材３６の上端面において環状突部４４の外周側に開口せしめられている。また一方、外周凹溝５８の周方向他方の端部は、仕切部材３６内を径方向に延びる通孔６２を通じて、仕切部材３６の下側凹所５０に開口せしめられている。
【００２９】
さらに、仕切部材３６には、ゴム弾性板６４と、隔壁部材としての隔壁金具６６が組み付けられている。ゴム弾性板６４は、所定厚さの略円板形状を有しており、その外周面には、固定スリーブとしての金属スリーブ６８が加硫接着されている。この金属スリーブ６８は、仕切部材３６に突設された環状突部４４よりも僅かに大径の薄肉円筒形状を有していると共に、その軸方向長さは、環状突部４４の突出高さよりも大きくされている。また、金属スリーブ６８の軸方向両側の開口端縁部は、それぞれ径方向内方に向かって僅かに屈曲されており、円環形状を有する上下の内方突起７４，７６が一体形成されている。更にまた、金属スリーブ６８は、その軸方向上側部分の内周面がゴム弾性板６４の外周面に加硫接着されていると共に、その軸方向下側部分には、ゴム弾性板６４と一体形成された薄肉のシールゴム層７２が、内周面の略全体に亘って被着されている。
【００３０】
そして、図２に示されているように、金属スリーブ６８の下側開口部分を仕切部材３６の環状突部４４に外挿せしめ、仕切部材３６の上面に当接させて位置合わせした状態で、金属スリーブ６８を八方絞り等で縮径加工することにより、金属スリーブ６８の下側開口部分が環状突部４４に外嵌固定されていると共に、下側の内方突起７６が環状突部４４の基端周縁部に形成された係合溝４８に嵌着固定されている。なお、ゴム弾性板６４は、その装着状態下、上下両面が拘束されることなく、他部材から離隔して位置せしめられており、板厚方向（上下方向）への弾性変形が許容されるようになっている。また、特に本実施形態では、ゴム弾性板６４が、全体として皿を伏せた形状とされており、外周部分が僅かな傾斜の逆テーパ状とされて、中央の平坦な円板状の上底部が外周部分から上方に僅かに持ち上がった形状とされている。
【００３１】
これによって、仕切部材３６の上側凹所４６の開口部がゴム弾性板６４で流体密に覆蓋されており、そこにゴム弾性板６４で壁部の一部が構成された密閉状の作用空気室７８が形成されている。また、仕切部材３６には、空気通路８０が形成されており、この空気通路８０の一方の開口端部が作用空気室７８に開口連通せしめられている一方、空気通路８０の他方の開口端部が、仕切部材３６の外周面に突設されたポート部８１に開口せしめられている。そして、マウント装着状態下では、このポート部８１に外部の空気管路が接続されることにより、図示しない圧力制御手段から及ぼされる空気圧変動が、かかる空気管路から空気通路８０を通じて作用空気室７８に及ぼされるようになっている。なお、ポート部８１は、仕切部材３６の位置決め突起３８の外周面に開口して形成された収容凹部８３内に収容状態で形成されている。
【００３２】
一方、隔壁金具６６は、図３〜４に示されているように、全体として略ハット形状を有しており、中央に形成された浅底の逆カップ状部８２の開口端縁部から径方向外方に広がるようにして鍔状部８４が一体形成されている。逆カップ状部８２は、円筒形状を有する周壁部８５の内径寸法が、ゴム弾性板６４に加硫接着された金属スリーブ６８の外径寸法よりも僅かに大きくされている。また、鍔状部８４は、円環板形状を有しており、その外径寸法が、仕切部材３６の外径寸法と略同じとされている。
【００３３】
また、隔壁金具６６の周壁部８５は、径方向一方向で対向位置する部分で、それぞれ、周方向に所定幅に亘って大径化されており、以て、周方向所定幅で径方向外方に向かって突出する一対の径方向突部８６，８８が一体形成されている。なお、これら径方向突部８６，８８は、鍔状部８４の外周縁部にまで略達する径方向寸法をもって形成されている。更に、各径方向突部８６，８８には、周壁部８５の一部が径方向に突出されることによって形成された径方向の突出先端部分９０，９２において、それぞれ、径方向に貫通するエア抜孔９４が形成されている。即ち、隔壁金具６６の周壁部８５には、径方向一方向で対向位置する部分に一対のエア抜孔９４，９４が形成されているのである。更にまた、隔壁金具６６の鍔状部８４には，一対の径方向突部８６，８８を繋ぐ周方向一方の側の中間部分において、受圧室側連通孔としての切欠窓９８が形成されている。
【００３４】
そして、図５〜６に示されているように、隔壁金具６６における逆カップ状部８２の開口部分を、仕切部材３６に組み付けた金属スリーブ６８に対して、軸方向上方から圧入して外嵌固定する。このように隔壁金具６６が金属スリーブ６８に組み付けられることによって、仕切部材３６と、金属スリーブ６８を備えたゴム弾性板６４、および隔壁金具６６によって一体的な組付体９６が形成されている。
【００３５】
かかる組付体９６においては、隔壁金具６６の鍔状部８４が金属スリーブ６８の軸方向中間部分に位置決めされており、以て、金属スリーブ６８の外周面上において、仕切部材３６の上端面と鍔状部８４の軸方向対向面間を周方向に連続して延びる環状溝１０４が形成されている。また、隔壁金具６６は、仕切部材３６に対して周方向で相対的に位置合わせされており、その鍔状部８４に形成された切欠窓９８が、仕切部材３６に形成された通孔６０に対して径方向で対向位置せしめられており、それによって、切欠窓９８と通孔６０が対向位置する径方向が、隔壁金具６６の径方向突部８６，８８が対向位置する径方向に対して略直交せしめられている。
【００３６】
また、隔壁金具６６における逆カップ状部８２の開口部がゴム弾性板６４で流体密に覆蓋されており、それら逆カップ状部８２とゴム弾性板６４の対向面間に、後述する副液室１１２を形成するための空所１０６が形成されている。更に、隔壁金具６６は、一対の径方向突部８６，８８において金属スリーブ６８から離隔されており、それら径方向突部８６，８８と金属スリーブ６８の離隔部間において、環状溝１０４を空所９８に連通せしめる一対の副液室側連通孔１００，１００が形成されている。
【００３７】
要するに、金属スリーブ６８の外周面上に形成された環状溝１０４は、周上の一箇所で、切欠窓９８を通じて隔壁金具６６の上面に開口せしめられており、そこから周方向両側に分岐して周方向にそれぞれ略１／４周の長さで延びた位置で、それぞれ副液室側連通孔１００，１００を通じて空所１０６に連通せしめられている。更に、これら副液室連通孔１００，１００を超えて、切欠窓９８から周方向両側にそれぞれ略半周の長さで延びた位置で合流し、通孔６２を通じて外周凹溝５８に接続されている。
【００３８】
そして、このような構造とされた組付体９６には、軸方向上方から本体ゴム弾性体１６の一体加硫成形品が組み付けられている。かかる組付けは、仕切部材３６の軸方向上方から第二の取付金具１４を外挿せしめ、第二の取付金具１４の係止突部２８を位置決め突起３８の軸方向上面に当接させて位置合わせした状態で、第二の取付金具１４を八方絞り等で縮径加工することにより、第二の取付金具１４の小径部２６の開口部分が仕切部材３６の上端部分に対して外嵌固定すると共に、第二の取付金具１４の小径部２６に設けられた係止突部２８を、位置決め突起３８の上方に形成された第一の周溝４０に嵌着固定せしめることによって、行なうことが出来る。
【００３９】
これによって、第二の取付金具１４における小径部２６側の開口部内周面が、シールゴム層３２を挟んで仕切部材３６の外周面に当接されており、以て、かかる小径部２６側の開口が仕切部材３６で流体密に閉塞されている。また、第二の取付金具１４の縮径加工により、隔壁金具６６の鍔状部８４の外周縁部が、第二の取付金具１４の小径部２６に対して、シールゴム層３２を介して径方向で流体密に当接されている。これによって、組付体９６に形成された環状溝１０４が小径部２６で覆蓋されて、環状通路１０８が形成されている。更に、径方向突部８６，８８における径方向の突出先端部分９０，９２は、第二の取付金具１４の小径部２６に対して、シールゴム層３２を介して径方向で流体密に当接されており、それによって、突出先端部分９０，９２に形成されたエア抜孔９４，９４が流体密に閉塞されている。
【００４０】
また、第二の取付金具１４に組付体９６が組み付けられることにより、本体ゴム弾性体１６とゴム弾性板６４が離隔して対向位置せしめられていると共に、それら本体ゴム弾性体１６とゴム弾性板６４の対向面間を仕切るようにして隔壁金具６６が配設されている。そして、隔壁金具６６と本体ゴム弾性体１６の対向面間には、壁部の一部が本体ゴム弾性体１６で構成されて、振動入力時に本体ゴム弾性体１６の弾性変形に基づいて圧力変動が生ぜしめられる受圧室１１０が形成されている。また、隔壁金具６６とゴム弾性板６４の対向面間には、壁部の一部がゴム弾性板６４で構成されて、作用空気室７８の圧力制御によりゴム弾性板６４のばね剛性を調節したり、ゴム弾性板６４を加振変形させることによって圧力制御することの出来る副液室１１２が構成されている。
【００４１】
さらに、仕切部材３６の下方には、可撓性ゴム膜としてのダイヤフラム１１６が配設されている。このダイヤフラム１１６は、薄肉のゴム膜によって形成されており、全体として弛みをもった薄肉円板形状を有していると共に、その外周縁部には、支持筒部材としての筒金具１１８が加硫接着されている。筒金具１１８は、全体として大径の円筒形状を呈しており、筒金具１１８の軸方向上側の開口端縁部には、径方向内方に向かって屈曲されて僅かに突出する係止突部１２０が、周方向に連続した円環形状で一体形成されている。なお、このような筒金具１１８は、第二の取付金具１４と同様に、プレス加工によって有利に製造することが出来る。そして、筒金具１１８における下側の開口端部内周面に対して、ダイヤフラム１１６の外周縁部が加硫接着されており、筒金具１１８の軸方向下側の開口部が流体密に閉塞されている。なお、このことから明らかなように、本実施形態では、ダイヤフラム１１６は、筒金具１１８を備えた一体加硫成形品として形成されている。また、筒金具１１８の内周面には、その全体に亘って、ダイヤフラム１１６と一体形成されたシールゴム層１２２が被着されている。
【００４２】
そして、仕切部材３６の軸方向下方から筒金具１１８を外挿せしめ、筒金具１１８の係止突部１２０を位置決め突起３８の軸方向下面に当接させて位置合わせした状態で、筒金具１１８を八方絞り等で縮径加工することにより、筒金具１１８の上側開口部分が、仕切部材３６の下端部分に対して、シールゴム層１２２を挟んで外嵌固定されていると共に、筒金具１１８に設けられた係止突部１２０が位置決め突起３８の下方に形成された第二の周溝４２に嵌着固定されている。これによって、仕切部材３６の下側凹所５０の開口部がダイヤフラム１１６で流体密に閉塞されている。なお、第二の取付金具１４の縮径加工と筒金具１１８の縮径加工は、同時に行うことが可能である。
【００４３】
而して、仕切部材３６にダイヤフラム１１６が組み付けられて下側凹所５０が流体密に覆蓋されることにより、仕切部材３６とダイヤフラム１１６の間には、壁部の一部がダイヤフラム１１６で構成されて、該ダイヤフラム１１６の変形に基づいて容易に容積変化が許容され、圧力変化が速やかに解消され得る平衡室１２４が形成されている。また、仕切部材３６に形成された外周凹溝５８も、筒金具１１８によって流体密に覆蓋されており、以て周方向に所定長さで延びる外周通路１３０が形成されている。
【００４４】
また、上述の如くして形成された受圧室１１０と副液室１１２および平衡室１２４には、それぞれ、非圧縮性流体が封入されている。なお、かかる封入流体としては、水やアルキレングリコール，ポリアルキレングリコール，シリコーン油等が何れも採用可能であり、特に後述するオリフィス通路を通じて流動せしめられる流体の共振作用に基づく防振効果を有利に得るためには、粘度が０．１Ｐａ・ｓ以下の低粘性流体が好適に採用される。更にまた、受圧室１１０は、平衡室１２４および副液室１１２に対して、それぞれ、環状通路１０８を利用して構成された第一のオリフィス通路１２６および第二のオリフィス通路１２８によって連通せしめられている。
【００４５】
ここにおいて、第一のオリフィス通路１２６は、受圧室１１０に開口する切欠窓９８から環状通路１０８を周方向に分岐してそれぞれ周方向に半周の長さで並列的に延び、通孔６０を通じて外周通路１３０に至り、通孔６２から平衡室１２４に達する流体流路によって構成されている。また、第二のオリフィス通路１２８は、受圧室１１０に開口する切欠窓９８から環状通路１０８内で周方向に分岐してそれぞれ周方向に略四半周の長さで延び、副液室側連通孔１００，１００を通じて副液室１１２に至る流体流路によって構成されている。特に本実施形態では、第一のオリフィス通路１２６が、第二のオリフィス通路１２８よりも通路長さが大きくされて低周波数域にチューニングされている。
【００４６】
また、受圧室１１０や副液室１１２，平衡室１２４に対する非圧縮性流体の充填と封入は、例えば組付体９６に対する第二の取付金具１４と金属スリーブ６８の組付けを非圧縮性流体中で行なうことによって有利に為され得る。
【００４７】
より具体的には、例えば、先ず図２に示されているように、仕切部材３６に対して、ゴム弾性板６４に加硫接着された金属スリーブ６８を組み付けるた後、図５〜６に示されているように、別途形成した隔壁金具６６を金属スリーブ６８に外嵌固定することにより、組付体９６を得る。そして、この組付体９６における仕切部材３６のポート部８１にゴム栓１３２（図６参照）を差し入れて作用空気室７８や空気通路８０の開口を流体密に覆蓋せしめた後、かかる組付体９６を非圧縮性流体中に浸漬する。続いて、非圧縮性流体中で組付体９６を傾斜や回転等させて、下側凹所５０や外周凹溝５８，空所１０６，環状溝１０４等に空気が残留しないように非圧縮性流体を行き渡らせる。
【００４８】
ここにおいて、組付体９６において略密閉構造とされた空所１０６は、一対の径方向突部８６，８８で形成された副液室側連通孔１００，１００を通じて環状溝１０４に開口せしめられていることに加えて、一対の径方向突部８６，８８の突出先端部分９０，９２にエア抜孔９４，９４が貫設されており、これらのエア抜孔９４，９４を通じて、空所１０６が直接に外部に連通せしめられていることから、比較的容易に非圧縮性流体を空所１０６に充填することが出来る。特に、例えば、非圧縮性流体中でノズル等から非圧縮性流体を噴出させて、それを一方のエア抜孔９４から空所１０６に吹き込むことにより、残留エアを他方のエア抜孔９４から速やかに排出させることも可能となる。
【００４９】
そして、組付体９６のエア除去を完了した後、それぞれ別途加硫成形した本体ゴム弾性体１６とダイヤフラム１１６の加硫成形品を非圧縮性流体中に浸漬し、本体ゴム弾性体１６に加硫接着された第二の取付金具１４と、ダイヤフラム１１６に加硫接着された筒金具１１８を、それぞれ、非圧縮性流体中で組付体９６の軸方向両側から外挿し、絞り加工して仕切部材３６に嵌着固定する。これによって、受圧室１１０や副液室１１２，平衡室１２４，第一及び第二のオリフィス通路１２６，１２８を形成すると同時に、それらに非圧縮性流体を充填して封入せしめることが出来るのであり、以て、目的とするエンジンマウント１０が完成する。
【００５０】
このような構造とされたエンジンマウント１０においては、例えば、エンジンシェイク等の低周波数域の振動入力時には、受圧室１１０と平衡室１２４の間に受動的に生ぜしめられる相対的な圧力変動に基づいて、第一のオリフィス通路１２６を通じて流動せしめられる流体の共振作用により有効な防振効果が発揮される。一方、アイドリング振動等の高周波数域の振動入力時には、外部から作用空気室７８にアイドリング振動に対応した周期の空気圧変動を及ぼしてゴム弾性板６４を加振駆動することによって副液室１１２に生ぜしめた内圧変動を、第二のオリフィス通路１２８を通じて受圧室１１０に及ぼすことにより、受圧室１１０の圧力変動を能動的乃至は積極的に制御することが可能であり、それによって、能動的な防振効果が発揮され得ることとなる。
【００５１】
ここにおいて、かかるエンジンマウント１０にあっては、仕切部材３６に対してゴム弾性板６４を組み付けるための金属スリーブ６８と、副液室１１２を形成するための隔壁金具６６を巧く利用して、第一のオリフィス通路１２６と第二のオリフィス通路１２８を、少ない部品点数と簡単な構造をもって形成せしめ得たのである。
【００５２】
すなわち、金属スリーブ６８が仕切部材３６の環状突部４４に対して外嵌固定されて径方向で当接されていると共に、この金属スリーブ６８に対して隔壁金具６６が外嵌固定されて径方向で当接されており、更に、隔壁金具６６の外周縁部が第二の取付金具１４の小径部２６に対して径方向に当接された状態で第二の取付金具１４が仕切部材３６に対して嵌着固定されている。このように、仕切部材３６と金属スリーブ６８，隔壁金具６６，第二の取付金具１４が、何れも径方向に当接されて固定されていることから、前述の如く、仕切部材３６に対して金属スリーブ６８，隔壁金具６６，第二の取付金具１４を、順次に組み付けることによって、最終的に全体として径方向に強固な組付力と、安定した部材間のシール性が効率的に発揮され得るのである。
【００５３】
しかも、このように各部材を径方向に当接させて組み付けるようにしたことにより、各部材を軸方向に重ね合わせて組み付ける場合に比して、エンジンマウント１０の全体の軸方向サイズを小さく抑えつつ、各部材間のシール性を有利に得ることが可能となる。
【００５４】
加えて、本実施形態では、環状通路１０８を利用して形成された第二のオリフィス通路１２８が、受圧室１１０に開口する切欠窓９８から周方向両側に分流して並列的に略四半周に亘って延びる構造とされていることから、第二のオリフィス通路１２８の通路断面積を全体として大きく確保することが可能となる。また、この環状通路１０８を一部に利用し、仕切部材３６の外周面に形成された外周通路１３０と協働して、第一のオリフィス通路１２６が形成されていることから、第一のオリフィス通路１２６の長さを全体として大きく確保することが出来る。それ故、これら第一のオリフィス通路１２６や第二のオリフィス通路１２８のチューニング自由度が大きく確保され得るのである。
【００５５】
また、本実施形態においては、仕切部材３６の軸方向両側から第二の取付金具１４と筒金具１１８が外嵌固定されており、それら第二の取付金具１４と筒金具１１８の何れも外嵌されていない仕切部材３６の軸方向中間部分（位置決め突起３８）の外周面に形成された収容凹部８３内にポート部８１が収容されていることから、ポート部８１に接続される外部管路を配設するために第二の取付金具１４や筒金具１１８に対して特別に加工を施す必要がなく、シール性が損なわれるようなこともない。
【００５６】
以上、本発明の実施形態について詳述してきたが、これはあくまでも例示であって、本発明は、かかる実施形態における具体的な記載によって、何等、限定的に解釈されるものではなく、当業者の知識に基づいて種々なる変更，修正，改良等を加えた態様において実施可能であり、また、そのような実施態様が、本発明の趣旨を逸脱しない限り、何れも、本発明の範囲内に含まれるものであることは、言うまでもない。
【００５７】
例えば、前記実施形態では、本体ゴム弾性体１６に対して第二の取付金具１４が加硫接着されていたが、第二の取付金具１４に対して本体ゴム弾性体１６を加硫接着せずに、第二の取付金具１４を本体ゴム弾性体１６と別部材とし、第二の取付金具１４に対してダイヤフラム１１６を加硫接着することも可能であり、そのような場合には、例えば図７に示されているような態様が好適に採用される。
【００５８】
すなわち、図７に示された態様においては、第二の取付金具１４における小径筒部２６が軸方向に長尺とされており、軸方向下端部分によって、前記実施形態における筒金具（１１８）が一体的に構成されている。そして、この第二の取付金具１４は、本体ゴム弾性体１６に加硫接着されておらず、本体ゴム弾性体１６から別部材とされており、小径部２６側の開口部に対してダイヤフラム１１６が加硫接着されている。一方、本体ゴム弾性体１６の外周面には、円筒形状の嵌着筒金具１４０が加硫接着されており、この嵌着筒金具１４０に対して、第二の取付金具１４の大径部２４が外挿されて、絞り加工等で流体密に嵌着固定されることによって、前記実施形態と同様な構造とされたエンジンマウント１４２が形成されている。
【００５９】
なお、かかるエンジンマウント１４２においては、第二の取付金具１４の小径部２６に対して、ポート部８１に接続する外部管路を挿通するための挿通孔１４４が形成されている。また、隔壁金具６６は、逆カップ状部８２の周壁部８５が、開口周縁部で折り返されて二重壁構造とされており、鍔状部８４の位置が、逆カップ状部８２の開口縁部よりも上底部側に位置せしめられていることによって、鍔状部８４と仕切部材３６の対向面間に形成される環状通路１０８、延いては第二のオリフィス通路１２８の断面積を大きく設定することが可能とされている。
【００６０】
また、前記実施形態では、ゴム弾性板６４の背後に形成された作用空気室７８に対して、防振すべき振動の周波数に対応した空気圧変動を及ぼして副液室１１２の圧力を能動制御するようになっていたが、その他、例えば、作用空気室７８における静的な空気圧値を、防振すべき振動の周波数に応じて変更設定することにより、ゴム弾性板６４の壁ばね剛性を調節し、以て、第二のオリフィス通路１２８を流動せしめられる流体の共振作用に基づいて発揮される受動的な防振効果のチューニング周波数を変更するようにしても良い。
【００６１】
或いはまた、図８に示されているように、作用空気室７８を形成することなく、ゴム弾性板６４の背後に平衡室１２４を形成することも可能である。なお、かかるエンジンマウント１４６においては、ゴム弾性板６４を含んで構成された仕切部材３６を挟んで、副液室１１２と反対側に平衡室１２４が形成されている。そして、副液室１１２の壁部を構成するゴム弾性板６４と平衡室１２４の壁部を構成するダイヤフラム１１６のばね剛性の相違を利用して、第一のオリフィス通路１２６および第二のオリフィス通路１２８をそれぞれ流動せしめられる流体の共振作用に基づく受動的な防振効果によって、互いに異なる周波数域の振動に対して有効な防振効果を得ることが出来るのである。
【００６２】
なお、図７及び図８においては、その理解を容易とするために、前記実施形態と同様な構造とされた部材及び部位については、それぞれ、図中に、前記実施形態と同一の符号を付しておく。
【００６３】
また、第一及び第二のオリフィス通路１２６，１２８のチューニング周波数は、防振すべき振動に応じて適宜に設定，変更され得るものであり、何等、限定されるものでない。
【００６４】
そして、第一及び第二のオリフィス通路１２６，１２８のチューニング周波数によって、オリフィス通路の構造は適宜に変更可能であり、例えば、環状通路１０８を周方向一周以下の長さとして、該環状通路１０８を利用して形成される第二のオリフィス通路１２８を、受圧室１１０に開口する切欠窓９８から周方向に分流させることなく、周方向一方の側にだけ延び出させて、周方向に半周以上の長さで形成することも可能である。或いは、仕切部材３６の軸方向上面における通孔６０の開口位置を、隔壁金具６６における切欠窓９８に対して周方向に近接位置せしめて、実質的に環状通路１０８を利用することなく第一のオリフィス通路１２６を形成したり、また、外周凹溝５８を形成しないで、第一のオリフィス通路１２６を、通孔６０から直接に平衡室１２４に接続すること等も可能である。
【００６５】
加えて、前記第一及び第二の実施形態では、本発明を自動車用のエンジンマウントに適用したものの具体例を示したが、その他、本発明は、振動の低減が要求される各種振動部材における防振装置に対して、何れも、有効に適用され得る。
【００６６】
【発明の効果】
上述の説明から明らかなように、本発明に従う構造とされた流体封入式防振装置においては、ゴム弾性板を仕切部材に組み付けるための固定スリーブと、受圧室と副液室を仕切るための隔壁部材とを、巧く利用して、第二のオリフィス通路を少ない部品点数と簡単な構造で形成せしめ得たのであり、特に、略ハット形状を有する特定構造の隔壁部材を採用したことにより、該隔壁部材を固定スリーブに外嵌固定するだけの簡単な組付構造をもって、隔壁部材とゴム弾性板の対向面間に位置する副液室と、固定スリーブの外周面上を周方向に延びる第二のオリフィス通路を有利に形成することが可能となるのである。
【図面の簡単な説明】
【図１】本発明の一実施形態としての自動車用エンジンマウントを示す縦断面図である。
【図２】図１に示されたエンジンマウントを構成する仕切部材とゴム弾性板の組付体を示す縦断面図である。
【図３】図１に示されたエンジンマウントを構成する隔壁部材を示す平面図である。
【図４】図３におけるIV−IV矢視図である。
【図５】図１に示されたエンジンマウントを構成する仕切部材とゴム弾性板および隔壁部材の組付体を示す平面図である。
【図６】図３におけるVI−VI断面図である。
【図７】本発明の別の具体的態様例を示す縦断面図である。
【図８】本発明の更に別の具体的態様例を示す縦断面図である。
【符号の説明】
１０ エンジンマウント
１２ 第一の取付金具
１４ 第二の取付金具
１６ 本体ゴム弾性体
３６ 仕切部材
４４ 環状突部
６４ ゴム弾性板
６６ 隔壁金具
６８ 金属スリーブ
７８ 作用空気室
８２ 逆カップ状部
８４ 鍔状部
８５ 周壁部
８６，８８ 径方向突部
９４ エア抜孔
９６ 組付体
１０８ 環状通路
１１０ 受圧室
１１２ 副液室
１１６ ダイヤフラム
１１８ 筒金具
１２４ 平衡室
１２６ 第一のオリフィス通路
１２８ 第二のオリフィス通路[0001]
【Technical field】
The present invention relates to a fluid-filled vibration isolator that obtains a vibration isolation effect based on a fluid action such as a resonance action of an incompressible fluid sealed inside, and particularly to a pressure receiving chamber to which vibration is input. And an auxiliary chamber connected to the pressure receiving chamber through a second orifice passage, and the first orifice passage and the second orifice. The present invention relates to a fluid-filled vibration isolator that obtains a vibration isolating effect against vibrations in different frequency ranges based on the fluid action of a fluid that can flow through a passage.
[0002]
[Background]
Conventionally, as a type of anti-vibration coupling body and anti-vibration support body interposed between members constituting a vibration transmission system, such as an automobile engine mount and a body mount, JP-A-4-357344 and As described in Kaihei 10-184775 and the like, a pressure receiving chamber in which a part of the wall is constituted by a main rubber elastic body that is elastically deformed upon vibration input, and a part of the wall is a rubber elastic plate. A secondary liquid chamber is formed, and equilibrium chambers in which a part of the wall portion is made of a flexible membrane are provided, incompressible fluid is sealed in each chamber, and the pressure receiving chamber and the equilibrium chamber are connected to each other. There is known a fluid-filled vibration isolator having a structure in which one orifice passage and a second orifice passage connecting a pressure receiving chamber and a sub liquid chamber are provided. In such a fluid-filled vibration isolator, the resonance of the fluid that can flow through the first orifice passage and the second orifice passage by tuning the first orifice passage and the second orifice passage to different frequency ranges, respectively. An effective anti-vibration effect can be obtained against vibrations having different frequencies based on the action.
[0003]
By the way, in such a fluid-filled type vibration isolator, the lengths of the first orifice passage and the second orifice passage can be set to be large, and a sufficient degree of freedom in tuning is ensured, while the pressure receiving chamber, the secondary liquid chamber, It is required to form the balance chamber, the first orifice passage, and the second orifice passage with a small number of parts and a simple structure.
[0004]
However, in the fluid-filled vibration isolator having the conventional structure, as described in the above publication, the first and second orifice passages including the partition member and the movable film are disposed and supported. There is a problem in that the structure is complicated and the number of parts is large, so that the manufacturing is troublesome and the manufacturing cost is high.
[0005]
In order to cope with such a problem, the applicant previously disclosed in Japanese Patent Application Laid-Open No. 11-264436 by vulcanizing and bonding a cylindrical fixture to the outer peripheral surface of the rubber elastic plate. A fluid-filled vibration isolator having a structure in which an outer peripheral edge portion of a rubber elastic plate is fixedly supported by a metal fitting with respect to a partition member and an orifice passage is formed by using the metal fitting is proposed. However, even in the prior application, the shape of the fixing bracket vulcanized and bonded to the rubber elastic plate is complicated, making it difficult to manufacture and assembling, or the orifice to be assembled to the fixing bracket when forming the orifice passage. There was a problem that a plurality of metal fittings were required, and there was still room for improvement.
[0006]
[Solution]
Here, the present invention has been made in the background as described above, and the problem to be solved is that the pressure receiving pressure is ensured while sufficiently securing the degree of freedom of tuning of the first and second orifice passages. Provided is a fluid-filled vibration isolator having an improved structure in which a chamber, a secondary liquid chamber, an equilibrium chamber, a first orifice passage, and a second orifice passage can be formed with a small number of parts and a simple structure. There is.
[0007]
[Solution]
Hereinafter, the aspect of this invention made | formed in order to solve such a subject is described. In addition, the component employ | adopted in each aspect as described below is employable by arbitrary combinations as much as possible. In addition, aspects or technical features of the present invention are not limited to those described below, but are described in the entire specification and drawings, or can be understood by those skilled in the art from those descriptions. It should be understood that it is recognized on the basis of.
[0008]
According to the first aspect of the present invention, the first mounting member and the second mounting member are separated from each other on the one opening side in the axial direction of the second mounting member having a substantially cylindrical shape. The member is connected by the main rubber elastic body, and the partition member supported by the second mounting member is disposed to face the main rubber elastic body, and the rubber is disposed on the surface of the partition member facing the main rubber elastic body. An elastic plate is disposed and supported in a deformable manner, and a partition wall member is disposed between the opposing surfaces of the main rubber elastic body and the rubber elastic plate and supported by the second mounting member, thereby sandwiching the partition wall member. On the other hand, a pressure receiving chamber in which a part of the wall portion is constituted by the main rubber elastic body is formed on one side, and a part of the wall portion is constituted by the rubber elastic plate on the other side across the partition member. The auxiliary liquid chamber is formed on the opposite side of the pressure receiving chamber and the auxiliary liquid chamber with the partition member interposed therebetween. A part of the part forms an equilibrium chamber composed of a flexible rubber film, and an incompressible fluid is sealed in the pressure receiving chamber, the auxiliary liquid chamber, and the equilibrium chamber, and the pressure receiving chamber is connected to the equilibrium chamber. In a fluid-filled vibration isolator having a first orifice passage and a second orifice passage connecting the pressure receiving chamber to the sub liquid chamber, a support protrusion is provided on a surface of the partition member facing the main rubber elastic body. A cylindrical fixing sleeve on the outer peripheral surface of the rubber elastic plate. Vulcanization adhesion Then, the outer peripheral edge of the rubber elastic plate is supported by the partition member by externally fitting and fixing one opening end of the fixing sleeve in the axial direction to the support protrusion, and the partition member is substantially hatted. As a shape, a bowl-shaped part is formed on the peripheral edge of the opening of the peripheral wall that opens toward the partition member. The , The peripheral wall of the partition member Protruded from the partition member Axial direction of the fixed sleeve At the tip External fitting fixation Caulking, so that the hook-shaped portion spreads at the axially intermediate portion of the fixing sleeve The hook-like portion is positioned away from the partition member. In addition, a seal rubber layer is formed on the inner peripheral surface of the second mounting member, and the outer peripheral edge portion of the flange-shaped portion of the partition wall member is brought into contact with the second mounting member via the seal rubber layer. Let me The second orifice passage is formed such that the outer peripheral side of the fixed sleeve extends in the circumferential direction between the flange-shaped portions and the opposing surfaces of the partition member.
[0009]
In the fluid-filled vibration isolator having the structure according to this aspect, the fixing sleeve fixed to the rubber elastic plate is fitted and fixed to the support protrusion protruding from the partition member, and the fixing is performed. By integrally fitting and fixing the partition wall member to the sleeve, an integrated assembly is formed. Then, by assembling this assembly to the second mounting member, the opposing surfaces of the main rubber elastic body and the rubber elastic plate are partitioned fluid-tightly by the partition member, and between the main rubber elastic body and the partition member. A pressure receiving chamber is formed, and a secondary liquid chamber is formed between the partition member and the rubber elastic plate. Further, the outer peripheral side of the rubber elastic plate extends in the circumferential direction between the opposing surfaces of the partition member and the partition member. Thus, the second orifice passage is formed.
[0010]
Therefore, in such a fluid filled type vibration damping device, the pressure receiving chamber, the secondary liquid chamber, the second orifice passage, and the like can be efficiently formed with a small number of parts, and further, with respect to the partition member. Since a fixed sleeve or a partition member having a rubber elastic plate is fixedly assembled in advance to form an assembled body, the assembled body can be assembled to the second mounting member. It becomes.
[0011]
In this aspect, it is desirable that the support member is integrally formed with the partition member, and preferably, the partition member is molded by a metal material such as a synthetic resin material or an aluminum alloy. Further, as the fixing sleeve, a metal cylindrical body can be suitably adopted, thereby facilitating manufacture and cost reduction, and in addition to firmly fixing the fixing sleeve to the rubber elastic plate by adhesion. In addition, it can be easily and firmly fitted and fixed to the support protrusions of the partition member by drawing or caulking. Furthermore, the partition member may be formed of a synthetic resin material or the like, but is preferably formed of a press fitting, thereby obtaining more advantageous sealing performance and fixing strength at an external fitting fixing portion with respect to the fixing sleeve. I can do it.
[0012]
In addition, the present invention Before In the fluid-filled vibration isolator according to the first aspect Is , On the inner peripheral surface of the second mounting member Said A seal rubber layer is formed and attached, and the second mounting member is fitted and fixed to the outer peripheral surface of the partition member via the seal rubber layer, and the outer peripheral edge portion of the flange-shaped portion of the partition member is the seal rubber. Abutting the second mounting member through a layer Can be suitably employed. In this embodiment, the partition member can be assembled to the second mounting member with a simple structure and high sealing performance. In particular, in this embodiment, in addition to the external fitting fixing to the support protrusion of the fixing sleeve fixed to the rubber elastic plate and the external fitting fixing of the partition wall member to the fixing sleeve, the second outer peripheral edge portion of the partition wall member Since the abutting and fixing to the mounting member is also realized by the fixing force in the radial direction, the fixing force and the sealing performance at the fixing portion between these members can be obtained more easily and highly.
[0013]
In addition, the first of the present invention two The aspect of the above One In the fluid filled type vibration damping device according to the aspect, the fixing sleeve and the peripheral wall of the partition wall member that are fitted and fixed to each other are separated from each other at an appropriate position on the periphery, thereby forming the fixing sleeve on the outer peripheral side of the fixing sleeve. A sub-liquid chamber side communication hole that allows the second orifice passage to communicate with the sub-liquid chamber is formed. In this embodiment, it is possible to advantageously form a communication path to the secondary liquid chamber of the second orifice passage without providing a deformed portion such as a notch to the rubber elastic plate.
[0014]
In addition, the first of the present invention three The aspect of the above two In the fluid-filled vibration isolator according to the above aspect, the peripheral wall of the partition member is expanded to the outer peripheral side at an appropriate position on the periphery to form a radial protrusion, and the radial protrusion is separated from the fixed sleeve. As a result, the secondary liquid chamber side communication hole is formed, an air vent hole is formed through the peripheral wall of the radial projection, and the air vent hole is formed by assembling the partition member to the second mounting member. It is characterized by being covered with two attachment members. In this embodiment, after the fixing sleeve having the rubber elastic plate and the partition wall member are assembled to the partition member in the atmosphere, the assembled body is immersed in the incompressible fluid to incompressible fluid. Among these, when assembling to the second mounting member, residual air remaining in the assembly can be easily discharged through the air vent hole. In addition, when the assembly of the assembly body to the second mounting member is completed, no special work is required, and the air vent hole of the radial protrusion is attached as the partition member is assembled to the second mounting member. Since the second mounting member is overlapped on the opening of the air gap and the air vent hole is covered, there is no problem of a short circuit of the orifice passage due to the air vent hole, so that the fluid flowing action of the orifice passage is effective. The anti-vibration effect based on it can also be exhibited stably and effectively.
[0015]
In addition, the first of the present invention Four The aspect of the above three In the fluid-filled vibration isolator according to the above aspect, a pair of the radial protrusions are formed at portions of the partition wall member that are substantially opposed to each other in the direction perpendicular to the axis, and the air vent holes are provided in the radial protrusions. This is a feature. That is, the first three In this aspect, it is desirable to provide a plurality of air vent holes in order to spray a jet flow from one air vent hole and to discharge residual air from the other air vent hole more efficiently and quickly, and more preferably, as in this aspect, It is desirable to form the pair of air vent holes so as to be opposed to each other in the radial direction of the partition wall member, thereby improving the discharge efficiency of the residual air.
[0016]
In addition, the first of the present invention Five The aspect of the above two Thru Four In the fluid-filled vibration isolator according to any one of the above aspects, an annular passage that continuously extends over the entire circumference in the circumferential direction is provided between the opposed surfaces of the rib-shaped portion of the partition wall member and the partition member. A pressure receiving chamber side communication hole that penetrates the flange-shaped portion and communicates the annular passage with the pressure receiving chamber at a portion opposed to the radial direction of the annular passage, and the annular passage through the partition member. By forming an equilibrium chamber side communication hole that communicates with the equilibrium chamber, the pressure receiving chamber side communication hole, the annular passage, and the equilibrium chamber side communication hole form the first orifice passage, while the pressure receiving pressure in the annular passage The auxiliary liquid chamber is configured such that the fixed sleeve and the peripheral wall of the partition wall member are spaced apart from each other at positions facing each other in the radial direction substantially perpendicular to the facing direction of the chamber side communication hole and the equilibrium chamber side communication hole. Forming a pair of side communication holes Thus, the second orifice passage is formed in such a form that the annular passage is branched from the pressure receiving chamber side communication hole to both sides in the circumferential direction and reaches the sub liquid chamber through the pair of sub liquid chamber side communication holes. Is a feature.
[0017]
In this embodiment, one second orifice passage is formed by a pair of flow passage portions formed in parallel with a length of a quarter circumference using an annular passage extending around the outer periphery of the fixed sleeve. Therefore, for example, even when the distance between the facing surfaces of the rib-like portion of the partition wall member and the partition member is small, the passage sectional area of the second orifice passage can be set to be substantially large. Also, the first orifice passage can be advantageously formed by using the second orifice passage as a part, and with an excellent space efficiency and ensuring an effective passage length and passage sectional area. . For example, the equilibrium chamber side opening of the equilibrium chamber side communication hole includes a flow path formed by covering the concave groove opening on the outer peripheral surface of the partition member with the second mounting member. This makes it possible to form a part of the first orifice passage with such a flow path, and the setting range of the length of the first orifice passage is further increased.
[0018]
Also, the first to the first Five In the fluid filled type vibration damping device according to any one of the above, on the opposite side of the secondary liquid chamber across the rubber elastic plate, for example, an equilibrium chamber is formed, and an air chamber sealed with respect to the external space is formed It is also possible to do. In a fluid-filled vibration isolator equipped with such an air chamber, for example, an air passage for applying air pressure to the air chamber from the outside is formed, and the pressure of the air chamber is reduced through the air passage. It is possible to control the anti-vibration characteristics by actively or positively adjusting according to the input state of vibration to be performed. In addition, if an equilibrium chamber is formed on the opposite side of the secondary liquid chamber with the rubber elastic plate in between, a simple structure that does not require a complicated air pressure control device, etc., and the vibration isolation effect by the first orifice passage and the second Thus, it is possible to advantageously realize a fluid filled type vibration isolator capable of easily and effectively obtaining the vibration isolation effect by the orifice passages in different frequency ranges.
[0019]
In addition, the first of the present invention Six The first to the second aspects Five In the fluid filled type vibration damping device according to any one of the above, the one opening portion in the axial direction of the second mounting member is vulcanized and bonded to the outer peripheral portion of the main rubber elastic body, and the flexible rubber film One opening portion of the supporting cylinder member in the axial direction is vulcanized and bonded to the outer peripheral portion of the first cylindrical member, and the other opening portion of each of the second mounting member and the supporting cylinder member is removed from both sides in the axial direction of the partition member. It is characterized by being fitted and fixed. In this embodiment, the second mounting member can be directly vulcanized and bonded to the main rubber elastic body. As a result, the second mounting member is fixed to the main rubber elastic body. This special member is not required and the manufacture is facilitated, and the leakage of the incompressible fluid between the main rubber elastic body and the second mounting member can be prevented to a very high degree.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, in order to clarify the present invention more specifically, embodiments of the present invention will be described in detail with reference to the drawings.
[0021]
First, FIG. 1 shows an automobile engine mount 10 as a first embodiment of the present invention. The engine mount 10 includes a first mounting bracket 12 as a first mounting member and a second mounting bracket 14 as a second mounting member that are spaced apart from each other. The second mounting bracket 14 has a structure in which the main rubber elastic body 16 is elastically connected. The first mounting bracket 12 is mounted on the power unit side of the automobile, while the second mounting bracket 14 is on the body side of the automobile. By attaching the power unit to the body, the power unit is supported to be vibration-proof with respect to the body. In the following description, the vertical direction means the vertical direction in FIG. 1 in principle.
[0022]
More specifically, the first mounting member 12 has a substantially inverted truncated cone shape, and a nut portion 18 that protrudes upward in the axial direction is integrally formed at an end portion on the large diameter side. . And the 1st attachment metal fitting 12 is attached to the power unit side with the volt | bolt which is not shown screwed by the screw hole 20 of the nut part 18. FIG.
[0023]
On the other hand, the second mounting bracket 14 has a large-diameter stepped cylindrical shape as a whole, with the large-diameter portion 24 on the upper side in the axial direction across the step portion 22 formed in the intermediate portion in the axial direction. In addition, the lower side in the axial direction is a small diameter portion 26. In addition, a locking projection 28 that is bent radially inward and slightly protrudes at the opening edge of the second mounting member 14 on the small diameter portion 26 side is an annular shape that is continuous in the circumferential direction. It is integrally formed with. In addition, such a 2nd attachment metal fitting 14 can be advantageously manufactured by press work, and it becomes possible to form the latching protrusion 28 easily by it. That is, after the blank is drawn into a bottomed cylindrical shape having a predetermined axial length, the locking projection 28 can be formed by punching out the central portion of the bottom. The second mounting member 14 is press-fitted and fixed to a cylindrical bracket member (not shown) and is attached to the body side via the bracket member.
[0024]
Further, the first mounting bracket 12 is disposed on the substantially same central axis so as to be separated from the large-diameter portion 24 side of the second mounting bracket 14. Two mounting brackets 14 are elastically connected by a main rubber elastic body 16.
[0025]
The main rubber elastic body 16 has a large-diameter substantially truncated cone shape, and a substantially mortar-shaped recess 30 opening in the central portion is formed on the large-diameter side end face. The first mounting bracket 12 is vulcanized and bonded to the small-diameter side end of the main rubber elastic body 16 in the axial direction, and the large-diameter side end of the main rubber elastic body 16 is attached. The inner peripheral surface of the large diameter portion 24 of the second mounting bracket 14 is vulcanized and bonded to the outer peripheral surface, and the opening on the large diameter portion 24 side of the second mounting bracket 14 is formed by the main rubber elastic body 16. It is closed fluid tightly. Further, a seal rubber layer 32 integrally formed with the main rubber elastic body 16 is attached to the entire inner peripheral surface of the small diameter portion 26 of the second mounting bracket 14. As is apparent from this, in the present embodiment, the main rubber elastic body 16 is formed as an integrally vulcanized molded product including the first and second mounting brackets 12 and 14.
[0026]
In addition, a partition member 36 is assembled in the opening on the small diameter portion 26 side of the second mounting bracket 14. The partition member 36 is formed of a hard material such as a hard synthetic resin material or a metal material, and has a circular block shape as a whole. In addition, a positioning projection 38 that slightly protrudes radially outward in the axially intermediate portion continues on the outer peripheral surface of the partition member 36 over the entire circumference in the circumferential direction with a substantially constant width dimension. The first circumferential groove 40 and the second circumferential groove 42 are formed on both sides of the positioning projection 38 in the axial direction. These first and second circumferential grooves 40 and 42 are both formed on the outer peripheral surface of the partition member 36 so as to extend in the circumferential direction over the entire circumference with a substantially constant width dimension.
[0027]
Furthermore, a substantially mortar-shaped upper recess 46 that opens upward is formed at the center of the upper end surface in the axial direction of the partition member 36, and the volume of the working air chamber 78 described later has a capacity of the upper recess 46. It is ensured to be advantageous. Further, the opening peripheral edge portion of the upper recess 46 is protruded upward, so that the annular protrusion 44 as the support protrusion protrudes upward on the upper end surface of the partition member 36. It is formed with an annular shape. Further, the annular protrusion 44 is formed with an engagement groove 48 which opens to the outer peripheral surface at the base end portion and extends over the entire circumference with a substantially constant width dimension. On the other hand, a lower recess 50 opening in the central portion is formed on the lower end surface in the axial direction of the partition member 36, and the volume of an equilibrium chamber 124 described later is advantageously ensured by the lower recess 50. It is like that.
[0028]
In addition, the partition member 36 is formed with an outer circumferential groove 58 that is open to the outer circumferential surface and extends in a predetermined length in the circumferential direction at a portion positioned below the annular protrusion 44 in the axial direction. One end in the circumferential direction of the groove 58 is opened to the outer peripheral side of the annular protrusion 44 on the upper end surface of the partition member 36 through a through hole 60 extending in the axial direction in the partition member 36. On the other hand, the other end in the circumferential direction of the outer circumferential groove 58 is opened to the lower recess 50 of the partition member 36 through a through hole 62 extending in the radial direction in the partition member 36.
[0029]
Further, the partition member 36 is assembled with a rubber elastic plate 64 and a partition metal fitting 66 as a partition member. The rubber elastic plate 64 has a substantially disc shape with a predetermined thickness, and a metal sleeve 68 as a fixed sleeve is vulcanized and bonded to the outer peripheral surface thereof. The metal sleeve 68 has a thin cylindrical shape slightly larger in diameter than the annular protrusion 44 projecting from the partition member 36, and its axial length is larger than the protrusion height of the annular protrusion 44. Has also been enlarged. Further, the opening edge portions on both axial sides of the metal sleeve 68 are slightly bent inward in the radial direction, and upper and lower inner protrusions 74 and 76 having an annular shape are integrally formed. . Furthermore, the metal sleeve 68 has an inner peripheral surface of the upper portion in the axial direction vulcanized and bonded to an outer peripheral surface of the rubber elastic plate 64, and is integrally formed with the rubber elastic plate 64 at the lower portion in the axial direction. The thin seal rubber layer 72 thus formed is applied over substantially the entire inner peripheral surface.
[0030]
Then, as shown in FIG. 2, in a state where the lower opening portion of the metal sleeve 68 is extrapolated to the annular protrusion 44 of the partition member 36 and brought into contact with the upper surface of the partition member 36, By reducing the diameter of the metal sleeve 68 with an eight-way stop or the like, the lower opening portion of the metal sleeve 68 is fitted and fixed to the annular protrusion 44, and the lower inward protrusion 76 is formed on the annular protrusion 44. It fits and is fixed in the engaging groove 48 formed in the base end peripheral portion. Note that the rubber elastic plate 64 is positioned away from other members without being constrained on the upper and lower surfaces in the mounted state, so that elastic deformation in the plate thickness direction (vertical direction) is allowed. It has become. Further, particularly in the present embodiment, the rubber elastic plate 64 has a dish-like shape as a whole, the outer peripheral portion has a slightly inclined reverse taper shape, and a flat disk-shaped upper bottom portion at the center. Is slightly raised upward from the outer peripheral portion.
[0031]
As a result, the opening of the upper recess 46 of the partition member 36 is fluid-tightly covered with the rubber elastic plate 64, and a sealed working air chamber in which a part of the wall portion is configured with the rubber elastic plate 64. 78 is formed. In addition, an air passage 80 is formed in the partition member 36, and one opening end portion of the air passage 80 is in open communication with the working air chamber 78, while the other opening end portion of the air passage 80 is provided. Is opened at a port portion 81 projecting from the outer peripheral surface of the partition member 36. In the mounted state, an external air pipe line is connected to the port portion 81, so that air pressure fluctuations exerted from a pressure control means (not shown) cause a working air chamber 78 from the air pipe line through the air passage 80. It has come to be affected. The port portion 81 is formed in a housed state in a housing recess 83 formed in the outer peripheral surface of the positioning projection 38 of the partition member 36 so as to open.
[0032]
On the other hand, as shown in FIGS. 3 to 4, the partition metal fitting 66 has a substantially hat shape as a whole, and has a diameter from the opening edge of the shallow reverse cup-shaped portion 82 formed in the center. A hook-shaped portion 84 is integrally formed so as to spread outward in the direction. In the inverted cup-shaped part 82, the inner diameter dimension of the peripheral wall part 85 having a cylindrical shape is slightly larger than the outer diameter dimension of the metal sleeve 68 vulcanized and bonded to the rubber elastic plate 64. Further, the bowl-shaped portion 84 has an annular plate shape, and its outer diameter dimension is substantially the same as the outer diameter dimension of the partition member 36.
[0033]
Further, the peripheral wall portion 85 of the partition wall metal fitting 66 is a portion opposed in one radial direction, and has a large diameter over a predetermined width in the circumferential direction. A pair of radial projections 86 and 88 projecting in the direction are integrally formed. The radial protrusions 86 and 88 are formed with a radial dimension that substantially reaches the outer peripheral edge of the bowl-shaped portion 84. Further, each of the radial protrusions 86 and 88 has a radially protruding tip portion 90 and 92 formed by protruding a part of the peripheral wall 85 in the radial direction. A hole 94 is formed. That is, a pair of air vent holes 94 are formed in the peripheral wall portion 85 of the partition wall metal fitting 66 at a portion opposed in one radial direction. Furthermore, a notch window 98 as a pressure receiving chamber side communication hole is formed in the flange-shaped portion 84 of the partition wall metal fitting 66 at an intermediate portion on one side in the circumferential direction connecting the pair of radial protrusions 86 and 88. .
[0034]
Then, as shown in FIGS. 5 to 6, the opening portion of the reverse cup-shaped portion 82 in the partition wall metal fitting 66 is press-fitted from above in the axial direction into the metal sleeve 68 assembled to the partition member 36 and externally fitted. Fix it. By assembling the partition metal fitting 66 to the metal sleeve 68 in this way, an integral assembly 96 is formed by the partition member 36, the rubber elastic plate 64 provided with the metal sleeve 68, and the partition metal fitting 66.
[0035]
In such an assembly 96, the hook-shaped portion 84 of the partition metal fitting 66 is positioned at the intermediate portion in the axial direction of the metal sleeve 68, so that the upper end surface of the partition member 36 and the upper surface of the partition member 36 are positioned on the outer peripheral surface of the metal sleeve 68. An annular groove 104 extending continuously in the circumferential direction is formed between the axially facing surfaces of the bowl-shaped portion 84. The partition metal fitting 66 is relatively aligned with the partition member 36 in the circumferential direction, and a notch window 98 formed in the hook-shaped portion 84 is formed in the through hole 60 formed in the partition member 36. The radial direction in which the cutout window 98 and the through hole 60 are opposed to each other is opposed to the radial direction in which the radial projections 86 and 88 of the partition wall metal fitting 66 are opposed to each other. It is almost orthogonal.
[0036]
In addition, the opening of the reverse cup-shaped portion 82 in the partition metal fitting 66 is covered with a rubber elastic plate 64 in a fluid-tight manner. A void 106 for forming 112 is formed. Further, the partition metal fitting 66 is separated from the metal sleeve 68 by a pair of radial protrusions 86, 88, and the annular groove 104 is formed between the radial protrusions 86, 88 and the separation part of the metal sleeve 68. A pair of secondary liquid chamber side communication holes 100, 100 are formed to communicate with 98.
[0037]
In short, the annular groove 104 formed on the outer peripheral surface of the metal sleeve 68 is opened on the upper surface of the partition wall metal fitting 66 through a notch window 98 at one place on the periphery, and then branches to both sides in the circumferential direction. At the positions extending in the circumferential direction by a length of about ¼, each is communicated with the void 106 through the secondary liquid chamber side communication holes 100, 100. Further, the sub-liquid chamber communication holes 100 and 100 are joined to each other at positions extending from the notch window 98 to both sides in the circumferential direction by a length of approximately half a circumference, and are connected to the outer circumferential groove 58 through the through-hole 62. .
[0038]
The assembly 96 having such a structure is assembled with an integrally vulcanized molded product of the main rubber elastic body 16 from above in the axial direction. Such assembly is performed by extrapolating the second mounting bracket 14 from above the partition member 36 in the axial direction, and bringing the locking projection 28 of the second mounting bracket 14 into contact with the upper surface in the axial direction of the positioning projection 38. In the combined state, the diameter of the second mounting bracket 14 is reduced by an eight-way drawing or the like, so that the opening portion of the small diameter portion 26 of the second mounting bracket 14 is externally fixed to the upper end portion of the partition member 36. At the same time, the locking projection 28 provided on the small diameter portion 26 of the second mounting bracket 14 can be fitted and fixed to the first circumferential groove 40 formed above the positioning projection 38. .
[0039]
As a result, the inner peripheral surface of the opening on the small diameter portion 26 side of the second mounting bracket 14 is in contact with the outer peripheral surface of the partition member 36 with the seal rubber layer 32 interposed therebetween, and thus the opening on the small diameter portion 26 side. Is closed fluid-tightly by the partition member 36. Further, due to the diameter reduction processing of the second mounting bracket 14, the outer peripheral edge portion of the flange-shaped portion 84 of the partition wall bracket 66 is radial with respect to the small diameter portion 26 of the second mounting bracket 14 via the seal rubber layer 32. In fluid tight contact. As a result, the annular groove 104 formed in the assembly 96 is covered with the small diameter portion 26 to form the annular passage 108. Further, the radially projecting tip portions 90 and 92 of the radial projections 86 and 88 are fluid-tightly contacted with the small diameter portion 26 of the second mounting member 14 in the radial direction via the seal rubber layer 32. As a result, the air vent holes 94, 94 formed in the projecting tip portions 90, 92 are fluid-tightly closed.
[0040]
Further, by assembling the assembly 96 to the second mounting bracket 14, the main rubber elastic body 16 and the rubber elastic plate 64 are spaced apart from each other, and the main rubber elastic body 16 and the rubber elastic body 16 are elastic. A partition metal fitting 66 is disposed so as to partition the opposing surfaces of the plate 64. And between the opposing surfaces of the partition metal fitting 66 and the main rubber elastic body 16, a part of the wall portion is constituted by the main rubber elastic body 16, and the pressure fluctuation is based on the elastic deformation of the main rubber elastic body 16 during vibration input. A pressure receiving chamber 110 is formed in which is generated. Further, a part of the wall portion is constituted by the rubber elastic plate 64 between the opposing surfaces of the partition wall metal 66 and the rubber elastic plate 64, and the spring rigidity of the rubber elastic plate 64 is adjusted by controlling the pressure of the working air chamber 78. Alternatively, a sub liquid chamber 112 is configured that can be pressure controlled by oscillating and deforming the rubber elastic plate 64.
[0041]
Further, a diaphragm 116 as a flexible rubber film is disposed below the partition member 36. The diaphragm 116 is formed of a thin rubber film, has a thin disk shape with a slack as a whole, and a cylindrical metal fitting 118 as a support cylinder member is vulcanized on the outer peripheral edge thereof. It is glued. The tubular metal fitting 118 has a cylindrical shape with a large diameter as a whole, and a locking protrusion that is bent inward in the radial direction and slightly protrudes at an opening edge on the axial upper side of the tubular metal fitting 118. 120 is integrally formed in an annular shape continuous in the circumferential direction. In addition, such a cylindrical metal fitting 118 can be advantageously manufactured by press work, like the second attachment metal fitting 14. The outer peripheral edge of the diaphragm 116 is vulcanized and bonded to the inner peripheral surface of the lower opening end of the cylindrical metal fitting 118, and the lower opening in the axial direction of the cylindrical metal fitting 118 is fluid-tightly closed. Yes. As is clear from this, in the present embodiment, the diaphragm 116 is formed as an integrally vulcanized molded product provided with a cylindrical metal fitting 118. Further, a seal rubber layer 122 integrally formed with the diaphragm 116 is attached to the inner peripheral surface of the cylindrical metal fitting 118 over the entire surface.
[0042]
Then, the tubular fitting 118 is inserted from the lower side in the axial direction of the partition member 36, and the tubular fitting 118 is placed in a state where the locking projection 120 of the tubular fitting 118 is brought into contact with the axially lower surface of the positioning projection 38 and aligned. By reducing the diameter with an eight-way drawing or the like, the upper opening portion of the tubular fitting 118 is fitted and fixed to the lower end portion of the partition member 36 with the seal rubber layer 122 interposed therebetween, and is provided on the tubular fitting 118. The locking projection 120 is fitted and fixed in a second circumferential groove 42 formed below the positioning projection 38. As a result, the opening of the lower recess 50 of the partition member 36 is fluid-tightly closed by the diaphragm 116. Note that the diameter reduction processing of the second mounting bracket 14 and the diameter reduction processing of the cylindrical metal fitting 118 can be performed simultaneously.
[0043]
Thus, when the diaphragm 116 is assembled to the partition member 36 and the lower recess 50 is covered fluid-tightly, a part of the wall portion is configured by the diaphragm 116 between the partition member 36 and the diaphragm 116. Thus, an equilibrium chamber 124 is formed in which the volume change is easily allowed based on the deformation of the diaphragm 116 and the pressure change can be quickly eliminated. Further, the outer peripheral concave groove 58 formed in the partition member 36 is also fluid-tightly covered with the cylindrical metal fitting 118, and thus an outer peripheral passage 130 extending in the circumferential direction with a predetermined length is formed.
[0044]
Further, incompressible fluid is sealed in each of the pressure receiving chamber 110, the secondary liquid chamber 112, and the equilibrium chamber 124 formed as described above. As the sealed fluid, water, alkylene glycol, polyalkylene glycol, silicone oil, etc. can be used, and particularly, a vibration-proofing effect based on the resonance action of the fluid flowing through the orifice passage described later is advantageously obtained. For this purpose, a low-viscosity fluid having a viscosity of 0.1 Pa · s or less is preferably employed. Furthermore, the pressure receiving chamber 110 is connected to the equilibrium chamber 124 and the auxiliary liquid chamber 112 by a first orifice passage 126 and a second orifice passage 128 configured using the annular passage 108, respectively. Yes.
[0045]
Here, the first orifice passage 126 divides the annular passage 108 in the circumferential direction from the notch window 98 opened in the pressure receiving chamber 110, and extends in parallel in the circumferential direction with a half circumference length. A fluid flow path that reaches the passage 130 and reaches the equilibrium chamber 124 from the through hole 62 is formed. The second orifice passage 128 branches from the notch window 98 opened to the pressure receiving chamber 110 in the circumferential direction in the annular passage 108 and extends in a length of approximately a quarter circumference in the circumferential direction. The fluid flow path reaches the sub liquid chamber 112 through 100, 100. In particular, in the present embodiment, the first orifice passage 126 is tuned to a low frequency region with a passage length larger than that of the second orifice passage 128.
[0046]
The pressure receiving chamber 110, the secondary liquid chamber 112, and the equilibrium chamber 124 are filled and sealed with, for example, the second mounting member 14 and the metal sleeve 68 attached to the assembly 96 in the incompressible fluid. Can be advantageously done by
[0047]
More specifically, for example, as shown in FIG. 2, a metal sleeve 68 vulcanized and bonded to a rubber elastic plate 64 is first assembled to the partition member 36, and then shown in FIGS. As shown, the separately formed partition wall metal fitting 66 is externally fixed to the metal sleeve 68 to obtain an assembly 96. A rubber plug 132 (see FIG. 6) is inserted into the port portion 81 of the partition member 36 in the assembly 96 to cover the working air chamber 78 and the opening of the air passage 80 in a fluid-tight manner, and then the assembly is assembled. 96 is immersed in an incompressible fluid. Subsequently, the assembly 96 is tilted or rotated in the incompressible fluid so that air does not remain in the lower recess 50, the outer peripheral recess 58, the void 106, the annular groove 104, or the like. Spread the fluid.
[0048]
Here, the void 106 having a substantially sealed structure in the assembly 96 is opened to the annular groove 104 through the secondary liquid chamber side communication holes 100, 100 formed by the pair of radial protrusions 86, 88. In addition to the above, air-extracting holes 94, 94 are provided through the projecting tip portions 90, 92 of the pair of radial protrusions 86, 88, and the void 106 is directly formed through these air-extracting holes 94, 94. Since it communicates with the outside, the incompressible fluid can be filled in the void 106 with relative ease. In particular, for example, by injecting an incompressible fluid from a nozzle or the like in an incompressible fluid and blowing it into a void 106 from one air vent hole 94, residual air is quickly discharged from the other air vent hole 94. It is also possible to make it.
[0049]
After the air removal of the assembly 96 is completed, the separately vulcanized main rubber elastic body 16 and the vulcanized molded product of the diaphragm 116 are dipped in an incompressible fluid and applied to the main rubber elastic body 16. The second mounting bracket 14 that is vulcanized and the cylindrical bracket 118 that is vulcanized and bonded to the diaphragm 116 are extrapolated from both sides in the axial direction of the assembly 96 in an incompressible fluid, and are drawn and partitioned. The member 36 is fixedly fitted. As a result, the pressure receiving chamber 110, the secondary liquid chamber 112, the equilibrium chamber 124, the first and second orifice passages 126 and 128 can be formed and filled with an incompressible fluid at the same time. Thus, the target engine mount 10 is completed.
[0050]
In the engine mount 10 having such a structure, for example, based on relative pressure fluctuations passively generated between the pressure receiving chamber 110 and the equilibrium chamber 124 at the time of vibration input in a low frequency range such as engine shake. Thus, an effective anti-vibration effect is exhibited by the resonance action of the fluid that flows through the first orifice passage 126. On the other hand, at the time of vibration input in a high frequency range such as idling vibration, an air pressure fluctuation with a period corresponding to idling vibration is exerted on the working air chamber 78 from the outside, and the rubber elastic plate 64 is driven to vibrate, thereby being generated in the sub liquid chamber 112. By applying the tightened internal pressure fluctuation to the pressure receiving chamber 110 through the second orifice passage 128, the pressure fluctuation in the pressure receiving chamber 110 can be actively or actively controlled, thereby preventing active prevention. The vibration effect can be exhibited.
[0051]
Here, in the engine mount 10, the metal sleeve 68 for assembling the rubber elastic plate 64 to the partition member 36 and the partition metal fitting 66 for forming the auxiliary liquid chamber 112 are skillfully used. The first orifice passage 126 and the second orifice passage 128 can be formed with a small number of parts and a simple structure.
[0052]
That is, the metal sleeve 68 is externally fitted and fixed to the annular protrusion 44 of the partition member 36 and is in radial contact with the metal sleeve 68, and the partition metal fitting 66 is externally fitted and fixed to the metal sleeve 68. Further, the second mounting bracket 14 is brought into contact with the partition member 36 in a state where the outer peripheral edge of the partition wall bracket 66 is in radial contact with the small diameter portion 26 of the second mounting bracket 14. On the other hand, it is fixed. As described above, since the partition member 36, the metal sleeve 68, the partition metal fitting 66, and the second mounting metal fitting 14 are all fixed in contact with each other in the radial direction, the partition member 36 is fixed as described above. By assembling the metal sleeve 68, the partition metal fitting 66, and the second mounting metal fitting 14 one after another, finally a strong assembling force in the radial direction as a whole and a stable sealing performance between the members can be efficiently exhibited. To get.
[0053]
In addition, since the members are assembled in contact with each other in the radial direction in this way, the overall axial size of the engine mount 10 is kept small compared to the case where the members are assembled in the axial direction. However, it is possible to advantageously obtain a sealing property between the members.
[0054]
In addition, in the present embodiment, the second orifice passage 128 formed by using the annular passage 108 is divided into both sides in the circumferential direction from the cutout window 98 that opens to the pressure receiving chamber 110, and is formed in a substantially quarter circumference in parallel. Since the structure extends over the entire area, it is possible to ensure a large passage sectional area of the second orifice passage 128 as a whole. In addition, since the first orifice passage 126 is formed in cooperation with the outer peripheral passage 130 formed on the outer peripheral surface of the partition member 36 by using the annular passage 108 as a part, the first orifice The length of the passage 126 can be largely secured as a whole. Therefore, a large degree of freedom in tuning of the first orifice passage 126 and the second orifice passage 128 can be ensured.
[0055]
In the present embodiment, the second mounting bracket 14 and the cylindrical bracket 118 are externally fitted and fixed from both sides in the axial direction of the partition member 36, and both the second mounting bracket 14 and the cylindrical bracket 118 are externally fitted. Since the port portion 81 is accommodated in the accommodating recess 83 formed in the outer peripheral surface of the axially intermediate portion (positioning protrusion 38) of the partition member 36 that is not provided, the external pipe line connected to the port portion 81 is In order to arrange, the second mounting bracket 14 and the cylindrical bracket 118 do not need to be specially processed, and the sealing performance is not impaired.
[0056]
The embodiment of the present invention has been described in detail above, but this is merely an example, and the present invention is not construed as being limited by the specific description in the embodiment, and those skilled in the art will understand. It is possible to implement the invention in various modifications, corrections, improvements, etc. based on the knowledge of the above, and any such implementation is within the scope of the present invention without departing from the gist of the present invention. Needless to say, it is included.
[0057]
For example, in the embodiment, the second mounting bracket 14 is vulcanized and bonded to the main rubber elastic body 16, but the main rubber elastic body 16 is not vulcanized and bonded to the second mounting bracket 14. In addition, the second mounting bracket 14 may be a separate member from the main rubber elastic body 16, and the diaphragm 116 may be vulcanized and bonded to the second mounting bracket 14. In such a case, for example, FIG. The embodiment as shown in FIG. 7 is preferably employed.
[0058]
That is, in the embodiment shown in FIG. 7, the small-diameter cylindrical portion 26 of the second mounting bracket 14 is elongated in the axial direction, and the cylindrical bracket (118) in the above embodiment is formed by the lower end portion in the axial direction. It is constructed integrally. The second mounting bracket 14 is not vulcanized and bonded to the main rubber elastic body 16, and is a separate member from the main rubber elastic body 16, and the diaphragm 116 with respect to the opening on the small diameter portion 26 side. Is vulcanized and bonded. On the other hand, a cylindrical fitting tube fitting 140 is vulcanized and bonded to the outer peripheral surface of the main rubber elastic body 16, and the large diameter portion 24 of the second mounting fitting 14 is attached to the fitting tube fitting 140. Is mounted and fixed fluid-tightly by drawing or the like, so that an engine mount 142 having the same structure as that of the above-described embodiment is formed.
[0059]
In the engine mount 142, an insertion hole 144 for inserting an external pipe connected to the port portion 81 is formed in the small diameter portion 26 of the second mounting bracket 14. The partition metal fitting 66 has a double wall structure in which the peripheral wall 85 of the reverse cup-shaped portion 82 is folded back at the opening peripheral edge portion, and the position of the hook-shaped portion 84 is the opening edge of the reverse cup-shaped portion 82. The cross-sectional area of the annular passage 108 formed between the flange-like portion 84 and the facing surface of the partition member 36, and thus the second orifice passage 128, is set larger by being positioned on the upper bottom side than the portion. It is possible to do.
[0060]
Further, in the above-described embodiment, the pressure of the sub liquid chamber 112 is actively controlled by applying an air pressure fluctuation corresponding to the vibration frequency to be vibrated to the working air chamber 78 formed behind the rubber elastic plate 64. In addition, for example, the wall spring rigidity of the rubber elastic plate 64 is adjusted by changing and setting the static air pressure value in the working air chamber 78 according to the frequency of vibration to be vibrated. Thus, the tuning frequency of the passive vibration-proofing effect that is exhibited based on the resonance action of the fluid that flows through the second orifice passage 128 may be changed.
[0061]
Alternatively, as shown in FIG. 8, the equilibrium chamber 124 can be formed behind the rubber elastic plate 64 without forming the working air chamber 78. In the engine mount 146, an equilibrium chamber 124 is formed on the opposite side of the sub liquid chamber 112 with a partition member 36 including the rubber elastic plate 64 interposed therebetween. The first orifice passage 126 and the second orifice passage are utilized by utilizing the difference in spring rigidity between the rubber elastic plate 64 constituting the wall portion of the auxiliary liquid chamber 112 and the diaphragm 116 constituting the wall portion of the equilibrium chamber 124. By virtue of the passive vibration-proofing effect based on the resonance action of the fluid that allows each of the 128 to flow, an effective vibration-proofing effect against vibrations in different frequency ranges can be obtained.
[0062]
In FIGS. 7 and 8, for ease of understanding, members and parts having the same structure as those of the above embodiment are denoted by the same reference numerals as those of the above embodiment. Keep it.
[0063]
Further, the tuning frequencies of the first and second orifice passages 126 and 128 can be set and changed as appropriate according to the vibration to be damped, and are not limited at all.
[0064]
The structure of the orifice passage can be appropriately changed according to the tuning frequencies of the first and second orifice passages 126 and 128. For example, the annular passage 108 is set to a length not more than one round in the circumferential direction. The second orifice passage 128 formed by utilizing the second orifice passage 128 extends only to one side in the circumferential direction without being diverted from the notch window 98 opened in the pressure receiving chamber 110 in the circumferential direction, and more than half a circumference in the circumferential direction. It is also possible to form with a length. Alternatively, the opening position of the through hole 60 on the upper surface in the axial direction of the partition member 36 is positioned close to the notch window 98 in the partition metal fitting 66 in the circumferential direction, and the first without substantially using the annular passage 108. It is also possible to connect the first orifice passage 126 directly to the equilibration chamber 124 from the through hole 60 without forming the orifice passage 126 or forming the outer circumferential concave groove 58.
[0065]
In addition, in the first and second embodiments, specific examples of the present invention applied to an engine mount for automobiles have been shown. In addition, the present invention is applicable to various vibration members that are required to reduce vibration. Any of them can be effectively applied to the vibration isolator.
[0066]
【The invention's effect】
As is apparent from the above description, in the fluid filled type vibration damping device structured according to the present invention, the fixed sleeve for assembling the rubber elastic plate to the partition member, and the partition wall for partitioning the pressure receiving chamber and the auxiliary liquid chamber The second orifice passage can be formed with a small number of parts and a simple structure by skillfully using the member, and in particular, by adopting a partition member having a specific structure having a substantially hat shape, A secondary liquid chamber located between the opposing surfaces of the partition wall member and the rubber elastic plate, and a second extending in the circumferential direction on the outer peripheral surface of the fixed sleeve, with a simple assembly structure in which the partition wall member is simply fitted and fixed to the fixed sleeve. It is possible to advantageously form the orifice passage.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an automobile engine mount as an embodiment of the present invention.
2 is a longitudinal sectional view showing an assembly of a partition member and a rubber elastic plate constituting the engine mount shown in FIG. 1;
3 is a plan view showing a partition member constituting the engine mount shown in FIG. 1. FIG.
4 is a view taken along arrow IV-IV in FIG. 3;
5 is a plan view showing an assembly of a partition member, a rubber elastic plate, and a partition member constituting the engine mount shown in FIG. 1. FIG.
6 is a sectional view taken along line VI-VI in FIG.
FIG. 7 is a longitudinal sectional view showing another specific example of the present invention.
FIG. 8 is a longitudinal sectional view showing still another specific example of the present invention.
[Explanation of symbols]
10 Engine mount
12 First mounting bracket
14 Second mounting bracket
16 Body rubber elastic body
36 Partition members
44 Annular protrusion
64 Rubber elastic plate
66 Bulkhead bracket
68 Metal sleeve
78 Working air chamber
82 Reverse cup-shaped part
84 bowl
85 Perimeter wall
86,88 radial projection
94 Air vent
96 Assembly
108 Annular passage
110 Pressure receiving chamber
112 Secondary liquid chamber
116 Diaphragm
118 Tube fitting
124 Equilibrium room
126 first orifice passage
128 Second orifice passage

Claims (7)

第一の取付部材を略円筒形状を有する第二の取付部材の軸方向一方の開口部側に離隔配置せしめて、それら第一の取付部材と第二の取付部材を本体ゴム弾性体で連結すると共に、該第二の取付部材で支持せしめた仕切部材を該本体ゴム弾性体に対向配置して、該仕切部材の該本体ゴム弾性体に対する対向面側にゴム弾性板を変形可能に配設支持せしめ、該本体ゴム弾性体と該ゴム弾性板の対向面間に隔壁部材を配設して該第二の取付部材で支持せしめることにより、該隔壁部材を挟んだ一方の側に該本体ゴム弾性体で壁部の一部が構成された受圧室を形成すると共に、該隔壁部材を挟んだ他方の側に該ゴム弾性板で壁部の一部が構成された副液室を形成する一方、前記仕切部材を挟んで該受圧室や該副液室と反対側に壁部の一部が可撓性ゴム膜で構成された平衡室を形成し、それら受圧室と副液室および平衡室に非圧縮性流体を封入すると共に、該受圧室を該平衡室に接続する第一のオリフィス通路と、該受圧室を該副液室に接続する第二のオリフィス通路を形成した流体封入式防振装置において、
前記仕切部材の前記本体ゴム弾性体への対向面に支持突部を設ける一方、前記ゴム弾性板の外周面に円筒形状の固定スリーブを加硫接着して、該固定スリーブの軸方向一方の開口端部を該支持突部に外嵌固定することにより、該ゴム弾性板の外周縁部を該仕切部材によって支持せしめると共に、前記隔壁部材を略ハット形状として該仕切部材に向かって開口する周壁の開口周縁部に鍔状部を形成して、該隔壁部材の周壁を該仕切部材から突出せしめられた該固定スリーブの軸方向先端部分に外嵌固定せしめ、該固定スリーブの軸方向中間部分で該鍔状部を広がるように該鍔状部を該仕切部材から離隔位置せしめると共に、前記第二の取付部材の内周面にシールゴム層を被着形成し、該隔壁部材における該鍔状部の外周縁部を該シールゴム層を介して該第二の取付部材に当接させて、それら鍔状部と仕切部材の対向面間で該固定スリーブの外周側を周方向に延びるようにして前記第二のオリフィス通路を形成したことを特徴とする流体封入式防振装置。The first mounting member is spaced apart from one opening in the axial direction of the second mounting member having a substantially cylindrical shape, and the first mounting member and the second mounting member are connected by the main rubber elastic body. In addition, the partition member supported by the second mounting member is disposed opposite to the main rubber elastic body, and the elastic rubber plate is disposed and supported so as to be deformable on the side of the partition member facing the main rubber elastic body. The partition rubber member is disposed between the opposing surfaces of the main rubber elastic body and the rubber elastic plate and supported by the second mounting member, so that the main rubber elastic member is sandwiched between the main rubber elastic member and the second elastic member. While forming a pressure receiving chamber in which a part of the wall part is configured by the body, and forming a sub liquid chamber in which a part of the wall part is configured by the rubber elastic plate on the other side across the partition member, A part of the wall part is a flexible rubber on the opposite side of the pressure receiving chamber and the auxiliary liquid chamber across the partition member A first orifice passage connecting the pressure receiving chamber to the equilibrium chamber, and the pressure receiving chamber. In a fluid-filled vibration isolator having a second orifice passage connecting the sub liquid chamber to the sub liquid chamber,
A supporting protrusion is provided on the surface of the partition member facing the main rubber elastic body, and a cylindrical fixing sleeve is vulcanized and bonded to the outer peripheral surface of the rubber elastic plate, so that one axial opening of the fixing sleeve is provided. The outer peripheral edge of the rubber elastic plate is supported by the partition member by externally fitting and fixing the end portion to the support projection, and the partition wall member has a substantially hat shape and is open to the partition member. the opening edge to form a flange portion, externally secured allowed the peripheral wall of the partition wall member in the axial tip portion of the fixing sleeve which is caused to protrude from the partition member, the axially intermediate portion of the fixed sleeve brought apart position the collar-like portion so as to expand the flange portion from the partition member Rutotomoni, the sealing rubber layer on the inner peripheral surface of the second mounting member is deposited and formed, the the collar-like portion of the partition wall member The outer peripheral edge of the sealing rubber layer It is brought into contact with the second mounting member and, to the formation of the second orifice passage so as to extend the outer periphery of the fixed sleeve in a circumferential direction between the opposing surfaces thereof flange portion and the partition member A fluid-filled vibration isolator characterized by the above. 互いに嵌着固定された前記固定スリーブと前記隔壁部材の周壁を周上の適当な箇所で離隔させることにより、該固定スリーブの外周側に形成された前記第二のオリフィス通路を前記副液室に連通せしめる副液室側連通孔を形成した請求項１に記載の流体封入式防振装置。By separating the fixed sleeve and the peripheral wall of the partition member that are fitted and fixed to each other at an appropriate position on the periphery, the second orifice passage formed on the outer peripheral side of the fixed sleeve is provided in the sub liquid chamber. The fluid filled type vibration damping device according to claim 1, wherein a communication hole on the side of the secondary liquid chamber that allows communication is formed. 前記隔壁部材の周壁を周上の適当な箇所で外周側に膨らませて径方向突部を形成し、該径方向突部を前記固定スリーブから離隔させることにより前記副液室側連通孔を形成すると共に、該径方向突部の周壁にエア抜孔を貫設し、且つ該隔壁部材の前記第二の取付部材への組み付けによって該エア抜孔が該第二の取付部材で覆蓋されるようにした請求項２に記載の流体封入式防振装置。The peripheral wall of the partition member is expanded to the outer peripheral side at an appropriate location on the circumference to form a radial protrusion, and the radial protrusion is separated from the fixed sleeve to form the sub liquid chamber side communication hole. In addition, an air vent hole is formed through the peripheral wall of the radial protrusion, and the air vent hole is covered with the second mounting member by assembling the partition member to the second mounting member. Item 3. A fluid-filled vibration isolator according to Item 2 . 前記隔壁部材において軸直角方向で略対向位置する部分に前記径方向突部を一対形成すると共に、それら各径方向突部に前記エア抜孔を設けた請求項３に記載の流体封入式防振装置。4. The fluid filled type vibration damping device according to claim 3 , wherein a pair of the radial protrusions are formed at portions of the partition wall member that are substantially opposed to each other in the direction perpendicular to the axis, and the air vent holes are provided in each of the radial protrusions. . 前記隔壁部材の前記鍔状部と前記仕切部材との対向面間に周方向の全周に亘って連続して延びる環状通路を設けて、該環状通路の径方向で対向位置する部分に、該鍔状部を貫通して該環状通路を前記受圧室に連通せしめる受圧室側連通孔と、前記仕切部材を貫通して該環状通路を前記平衡室に連通せしめる平衡室側連通孔を形成することにより、それら受圧室側連通孔と環状通路および平衡室側連通孔によって前記第一のオリフィス通路を形成する一方、該環状通路における該受圧室側連通孔と該平衡室側連通孔の対向方向に略直交する径方向で対向する位置において、それぞれ、互いに嵌着固定された前記固定スリーブと前記隔壁部材の周壁を離隔せしめ前記副液室側連通孔を一対形成することにより、該受圧室側連通孔から該環状通路を周方向両側に分流してかかる一対の副液室側連通孔を通じて前記副液室に至る形態をもって前記第二のオリフィス通路を形成した請求項２乃至４の何れかに記載の流体封入式防振装置。An annular passage continuously extending over the entire circumference in the circumferential direction is provided between the opposing surfaces of the rib-shaped portion of the partition wall member and the partition member, and a portion facing the radial direction of the annular passage is A pressure receiving chamber side communication hole that allows the annular passage to communicate with the pressure receiving chamber through the bowl-shaped portion; and an equilibrium chamber side communication hole that allows the annular passage to communicate with the equilibrium chamber through the partition member. The pressure receiving chamber side communication hole, the annular passage, and the equilibrium chamber side communication hole form the first orifice passage, while the pressure receiving chamber side communication hole and the equilibrium chamber side communication hole in the annular passage are opposed to each other. The pressure receiving chamber side communication is formed by separating the fixing sleeve and the peripheral wall of the partition wall member that are fitted and fixed to each other in a substantially perpendicular radial direction, and by forming a pair of the secondary liquid chamber side communication holes. The annular passage from the hole Fluid-filled vibration damping device according to any one of claims 2 to 4 have the form leading to the auxiliary liquid chamber through the pair of auxiliary liquid chamber side communication hole Kakaru shunts the opposite sides to form said second orifice passage . 前記ゴム弾性板と前記仕切部材の間に作用空気室を形成すると共に、該作用空気室に対して外部から空気圧を及ぼすための空気通路を設けた請求項１乃至５の何れかに記載の流体封入式防振装置。The fluid according to any one of claims 1 to 5 , wherein a working air chamber is formed between the rubber elastic plate and the partition member, and an air passage for applying air pressure to the working air chamber from the outside is provided. Enclosed vibration isolator. 前記本体ゴム弾性体の外周部分に前記第二の取付部材の軸方向一方の開口部分を加硫接着すると共に、前記可撓性ゴム膜の外周部分に支持筒部材の軸方向一方の開口部分を加硫接着せしめて、それら第二の取付部材と支持筒部材におけるそれぞれの軸方向他方の開口部分を前記仕切部材の軸方向両側から外嵌固定した請求項１乃至６の何れかに記載の流体封入式防振装置。One opening portion in the axial direction of the second mounting member is vulcanized and bonded to the outer peripheral portion of the main rubber elastic body, and one opening portion in the axial direction of the support cylinder member is attached to the outer peripheral portion of the flexible rubber film. The fluid according to any one of claims 1 to 6 , wherein the second mounting member and the support cylinder member are fitted and fixed to each other in the axial direction from both sides of the partition member by vulcanization adhesion. Enclosed vibration isolator.
JP2002096670A 2002-03-29 2002-03-29 Fluid filled vibration isolator Expired - Fee Related JP3899981B2 (en)

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