JP3913698B2

JP3913698B2 - Active fluid filled vibration isolator

Info

Publication number: JP3913698B2
Application number: JP2003084453A
Authority: JP
Inventors: 和彦加藤; 圭奥村; 光一前田; 哲雄三笠; 浩臣根本; 博昭上; 健飯沼
Original assignee: Honda Motor Co Ltd; Tokai Rubber Industries Ltd
Current assignee: Honda Motor Co Ltd; Sumitomo Riko Co Ltd
Priority date: 2003-03-26
Filing date: 2003-03-26
Publication date: 2007-05-09
Anticipated expiration: 2023-03-26
Also published as: JP2004293605A

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圧力を能動的に制御するアクチュエータを備え、アクチュエータの作動に基づいて相殺的乃至は積極的な防振効果を発揮せしめ得る能動型の流体封入式防振装置に係り、例えば自動車用のエンジンマウントやボデーマウント等に好適に採用される新規な構造の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、振動伝達系を構成する部材間に装着される防振連結体や防振支持体の一種として、アクチュエータの作動に基づいて内部に封入された非圧縮性流体を圧力制御することにより相殺的乃至は積極的な防振効果を発揮する能動型の流体封入式防振装置が、知られている。例えば、特許文献１や特許文献２に開示されているものが、それである。
【０００３】
【特許文献１】
特開２０００−２２７１３７号公報
【特許文献２】
特開２００２−２８６０８２号公報
【０００４】
すなわち、能動型の流体封入式防振装置は、一般に、第一の取付金具を略筒形状の第二の取付金具の一方の開口部側に離隔配置せしめてこれら第一の取付金具と第二の取付金具を本体ゴム弾性体で連結することにより該第二の取付金具の一方の開口部を流体密に閉塞する一方、該第二の取付金具の他方の開口部に段差部を設けて大径のかしめ筒部を一体形成し、かかるかしめ筒部によって蓋部材をかしめ固定して第二の取付金具の他方の開口部を流体密に覆蓋することにより、本体ゴム弾性体と蓋部材の間に非圧縮性流体が封入された流体室を形成した構造とされている。また、蓋部材の中央部分には、加振板が加振ゴム板によって弾性支持されており、この加振板を、蓋部材の外方に位置せしめて装着したアクチュエータで加振駆動することによって、流体室に圧力変動が及ぼされるようになっている。
【０００５】
ところで、アクチュエータを第二の取付金具に装着するに際しては、例えば前記特許文献１，２にも記載されているように、アクチュエータのハウジングに設けたフランジ部を、第二の取付金具のかしめ筒部により、蓋部材と共にかしめ固定することが考えられる。
【０００６】
しかしながら、アクチュエータのハウジングを第二の取付金具に対して直接にかしめ固定すると、第二の取付金具に及ぼされる振動部材の振動がアクチュエータに対して直接に伝達されることとなることから、アクチュエータの耐久性や組付け精度に対して入力振動が悪影響を及ぼすおそれがあり、特に電磁駆動手段等の微小な隙間寸法で出力部材が駆動されるアクチュエータの場合には出力特性の安定性等にも悪影響が及ぼされるおそれがあった。
【０００７】
しかも、第二の取付金具に対するかしめ固定部位において、かしめ固定する部材が増えると、その分だけ、各部材の寸法精度の重畳などに起因してかしめ固定力を安定して得ることが難しくなるという問題もあったのである。
【０００８】
【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、第二の取付金具に対して蓋部材等を高精度に安定してかしめ固定することが出来ると共に、能動制御のためのアクチュエータを第二の取付金具に対して簡単な構造で緩衝的に組み付けることの出来る、新規な構造の能動型流体封入式防振装置を提供することにある。
【０００９】
【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。
【００１０】
（本発明の態様１）
本発明の態様１は、第一の取付金具を略筒形状の第二の取付金具の一方の開口部側に離隔配置せしめてこれら第一の取付金具と第二の取付金具を本体ゴム弾性体で連結することにより該第二の取付金具の一方の開口部を流体密に閉塞する一方、該第二の取付金具の他方の開口部に段差部を設けて大径のかしめ筒部を一体形成し、中央部分に加振板が接着された加振ゴム板の外周縁部に環状の固定金具を接着せしめた蓋部材を該第二の取付金具の他方の開口部に配して、該固定金具を該かしめ筒部に圧入して該段差部に重ね合わせてかしめ固定することにより該第二の取付金具の他方の開口部を流体密に覆蓋せしめて、該本体ゴム弾性体と該蓋部材の間に非圧縮性流体が封入された流体室を形成した能動型流体封入式防振装置において、一方の開口部に鍔状部を備えた筒状のベースブラケットを採用し、該鍔状部を前記固定金具に対して該一方の開口部の外方から重ね合わせて該固定金具と共に前記かしめ筒部でかしめ固定することにより、該ベースブラケットを前記第二の取付金具に組み付けると共に、該固定金具の外周縁部を該ベースブラケット側に屈曲させて環状圧入部を形成して、該環状圧入部の突出先端面を該鍔状部の外周縁部に対して軸方向で直接に重ね合わせる一方、前記加振板に加振力を及ぼすアクチュエータを該加振板を挟んで前記流体室と反対側に配設すると共に、該アクチュエータのハウジングを該固定金具に向かって筒状に延び出させてその開口部に設けたフランジ部を、該環状圧入部の内周側に位置する部分において該環状圧入部と径方向で隙間を隔てて配設すると共に、該固定金具と該ベースブラケットの鍔状部との間で圧縮ゴム層を介してかしめ固定力を及ぼして挟圧支持せしめたことにある。
【００１１】
このような本態様に従う構造とされた能動型の流体封入式防振装置においては、第二の取付部材を防振連結等すべき一方の部材に取り付けるためのベースブラケットの鍔状部を蓋部材の固定金具と共にかしめ固定せしめて、これら鍔状部と固定金具の間で、アクチュエータのハウジングを圧縮ゴム層を介して緩衝的に挟圧支持せしめたことにより、かかる圧縮ゴム層の弾性に基づいて、第二の取付部材からアクチュエータへの振動伝達が緩和されることとなり、以て、アクチュエータへの直接的な振動伝達に起因する不具合が軽減乃至は回避され得るのである。
【００１２】
また、本態様においては、固定金具の外周縁部が環状圧入部とされて、かしめ筒部に対する圧入面が軸方向に大きく設定されていることから、例えば非圧縮性流体中で、予め本体ゴム弾性体で軸方向一方の開口部が覆蓋された第二の取付金具に蓋部材を組み付けるに際して、かしめ筒部に対する固定金具の圧入面積が有利に確保され得て、第二の取付金具の他方の開口部を蓋部材により良好な流体密性をもって覆蓋することが出来るのであり、それ故、第二の取付金具に固定金具を圧入して蓋部材を組み付けた組付体を非圧縮性流体から取り出した後、流体室の流体密性を安定して確保した状態下で、大気中においてアクチュエータのハウジングやベースブラケットを組み付けてかしめ筒部をかしめ加工することが可能となって、組付作業も容易となるのである。
【００１３】
さらに、固定金具の外周縁部に突設された環状圧入部には、かしめ筒部による軸方向のかしめ固定力がベースブラケットの鍔状部を介して及ぼされることから、ベースブラケットの鍔状部においてかしめ筒部の重ね合わせ面積が有利に確保され得て、かしめ加工に際してのかしめ筒部の不安定な変形が防止され得ることとなり、薄肉の環状圧入部等に対しても、かしめ筒部によるかしめ力が効果的に且つ安定して及ぼされ得て、全体として有効なかしめ力が各部材に作用せしめられるのである。
【００１４】
（本発明の態様２）
本発明の態様２は、前記態様１に係る能動型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本体ゴムアウタ金具を加硫接着せしめて、該本体ゴムアウタ金具の外周縁部を前記第二の取付金具の前記段差部と前記固定金具の間に重ね合わせて前記かしめ筒部でかしめ固定することにより、該本体ゴム弾性体の外周縁部を該第二の取付金具に固着せしめたことを、特徴とする。本態様においては、かしめ筒部を備えた第二の取付金具を本体ゴム弾性体と別体形成して、本体ゴム弾性体の加硫成形後に第二の取付金具をあと固定することが出来るのであり、それによって、第二の取付金具や本体ゴム弾性板の設計自由度が向上される。
【００１５】
（本発明の態様３）
本発明の態様３は、前記態様１又は態様２に係る能動型流体封入式防振装置において、前記本体ゴム弾性体の外側で前記第一の取付金具と前記第二の取付金具の間に跨がって広がる可撓性ゴム膜を設けて、該本体ゴム弾性体を挟んで前記流体室と反対側に該可撓性ゴム膜で壁部の一部が構成された容積可変の平衡室を形成し、該平衡室に非圧縮性流体を封入すると共に、該平衡室を前記流体室に連通せしめるオリフィス通路を形成したことを、特徴とする。本態様においては、振動入力時に受圧室と平衡室の間を流動せしめられる流体の共振作用等に基づいて、受動的な防振効果を得ることが出来る。
【００１６】
なお、特に本態様は、前記態様２と組み合わせて好適に採用される。そこにおいて、例えば、本体ゴム弾性体の中央部部分に本体ゴムインナ金具を加硫接着せしめて、該本体ゴム弾性体を該本体ゴムインナ金具により第一の取付金具に対して後固定する構成を採用すれば、本体ゴム弾性体とは別体形成された薄肉のゴム膜からなるダイヤフラムを第一の取付金具と第二の取付金具の間に跨がって形成してそれら両金具に加硫接着し、本体ゴム弾性体を覆うように配設する構成が、一層有利に実現され得る。なお、本態様において受圧室と平衡室を相互に連通するオリフィス通路は、例えば本体ゴムアウタ金具と第二の取付金具との径方向重ね合わせ面間において有利に形成され得る。
【００１７】
（本発明の態様４）
本発明の態様４は、前記態様２又は３に係る能動型流体封入式防振装置において、前記第二の取付金具における前記段差部よりも小径の仕切金具を前記流体室に収容配置して、前記本体ゴムアウタ金具と前記固定金具の間に該仕切金具の外周縁部を挟んで当接ゴム層を介してかしめ固定力を及ぼすことにより該仕切金具を挟圧支持せしめて、該流体室を該仕切金具で仕切ることにより、該仕切金具を挟んだ一方の側に、壁部の一部が前記本体ゴム弾性体で構成されて振動入力時に圧力変動が生ぜしめられる受圧室を形成すると共に、該仕切金具を挟んだ他方の側に、壁部の一部が前記加振板で構成されて該加振板の加振駆動によって圧力制御される加振室を形成すると共に、該受圧室と該加振室を相互に連通する圧力伝達流路を形成したことを、特徴とする。
【００１８】
本態様においては、受圧室と加振室を区画形成する仕切金具を、第二の取付金具におけるかしめ固定部位を利用して組み付けることが出来るのであり、特に、仕切金具を段差部とかしめ筒部の間で直接に金属同士の当接でかしめ固定することなく、本体ゴムアウタ金具と固定金具を介して且つ当接ゴム層を挟んで間接的且つ弾性的に第二の取付金具に対して仕切金具がかしめ固定されることから、仕切金具の組付けによって段差部とかしめ筒部の間でのかしめ固定部位の寸法が軸方向に大きくなることもなく、仕切金具の寸法誤差がかしめ固定部位に与える影響も回避され得るのであり、それ故、安定したかしめ固定精度を有効に確保しつつ仕切金具を組み付けることが出来るのである。
【００１９】
（本発明の態様５）
本発明の態様５は、前記態様１乃至４の何れかに係る能動型流体封入式防振装置において、前記圧縮ゴム層を、前記固定金具に対して、前記アクチュエータのフランジ部側の面において、前記環状圧入部よりも内周側に所定距離だけ離隔した位置に被着形成したことを、特徴とする。本態様においては、固定金具に被着形成される加振ゴム板と同時に、圧縮ゴム層を容易に形成することが可能となる。
【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、能動型流体封入式防振装置に関する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た構造とされており、第一の取付金具１２が図示しない自動車のパワーユニットに取り付けられる一方、第二の取付金具１４が図示しない自動車のボデーに取り付けられることにより、パワーユニットをボデーに対して防振支持するようになっている。また、そのような装着状態下、第一の取付金具１２と第二の取付金具１４の間には、パワーユニットの分担荷重と、防振すべき主たる振動が、何れも、エンジンマウント１０の略軸方向（図１中、上下方向）に入力されるようになっている。なお、以下の説明中、上下方向とは、原則として、図１中の上下方向を言うものとする。
【００２２】
より詳細には、第一の取付金具１２は、厚肉の円板形状を有している。また、第一の取付金具１２には、略中央部分に挿通孔１８が貫設されていると共に、外周部分の上面に取付板部２０が一体的に突設されている。そして、取付板部２０に貫設されたボルト通孔２２に挿通される図示しない固定ボルトにより、第一の取付金具１２が図示しない自動車のパワーユニットに取り付けられるようになっている。
【００２３】
また、第二の取付金具１４は、薄肉大径の円筒形状を有しており、その軸方向下側の開口部には、径方向外方に向かって広がる円環板形状の段差部２４が一体形成されており、更に、段差部２４の外周縁部には、軸方向下方に向かって突出する円環状のかしめ筒部２６が一体形成されている。
【００２４】
そして、第二の取付金具１４の軸方向上方に離隔して、第一の取付金具１２が、略同一中心軸上に配設されており、それら第一の取付金具１２と第二の取付金具１４が、可撓性ゴム膜としてのダイヤフラム３０によって連結されている。ダイヤフラム３０は、薄肉のゴム膜によって形成されており、容易に弾性変形が許容されるように大きな弛みを持った湾曲断面形状をもって周方向に延びる略円環形状を有している。そして、ダイヤフラム３０の内周縁部が、第一の取付金具１２の外周縁部に対して加硫接着されていると共に、ダイヤフラム３０の外周縁部が、第二の取付金具１４の軸方向上側の開口周縁部に加硫接着されている。これにより、ダイヤフラム３０は、第一の取付金具１２および第二の取付金具１４を備えた一体加硫成形品として形成されている。
【００２５】
また、かかる一体加硫成形品には、別体加硫成形された本体ゴム弾性体１６が、後から組み付けられており、本体ゴム弾性体１６によって、第一の取付金具１２と第二の取付金具１４が弾性連結されている。
【００２６】
本体ゴム弾性体１６は、全体として大径の円錐台形状を有しており、その中央部分には、本体ゴムインナ金具３２が同軸的に配されて加硫接着されていると共に、その大径側端部外周面に対して本体ゴムアウタ筒金具３４が重ね合わせられて加硫接着されている。
【００２７】
本体ゴムインナ金具３２は、逆向きの略円錐台形状を有しており、その略中央部分には上面に開口するねじ穴３８が設けられている。一方、本体ゴムアウタ筒金具３４は、略大径円筒形状を有する筒壁部４０を備えており、この筒壁部４０の軸方向下端部には径方向外方に向かって広がるフランジ状部４２が一体形成されていると共に、筒壁部４０の軸方向上端部分は、軸方向上方に行くに従って次第に拡開するテーパ筒状部４４とされている。これによって、本体ゴムアウタ筒金具３４の外周側には、外周面に開口して周方向に一周弱の長さで延びる周溝４５が形成されている。そして、本体ゴム弾性体１６に対して加硫接着せしめられた状態下で、本体ゴムインナ金具３２における逆テーパ形状の外周面と本体ゴムアウタ筒金具３４におけるテーパ筒状部４４が相互に離隔して対向位置せしめられており、これら本体ゴムインナ金具３２と本体ゴムアウタ筒金具３４の対向面間が、本体ゴム弾性体１６によって弾性的に連結されている。
【００２８】
而して、本体ゴム弾性体１６の一体加硫成形品に対して、ダイヤフラム３０の一体加硫成形品が上方から重ね合わせられて組み付けられており、第一の取付金具１２が本体ゴムインナ金具３２の上面に重ね合わされて固着されていると共に、第二の取付金具１４が本体ゴムアウタ筒金具３４に外嵌されて固着されており、更にダイヤフラム３０が、本体ゴム弾性体１６の外方に離隔して、本体ゴム弾性体１６の外面を全体に亘って覆うようにして配設されている。これにより、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。
【００２９】
すなわち、第一の取付金具１２が本体ゴムインナ金具３２の上面に直接に重ね合わされて、連結ボルト４６で相互に固定されている。なお、第一の取付金具１２と本体ゴムインナ金具３２の重ね合わせ面間には凹凸嵌合部が設けられており、軸直角方向および周方向で位置決めされている。一方、本体ゴムアウタ筒金具３４は、その下端部において、フランジ状部４２の外周縁部が第二の取付金具１４の段差部２４に対して軸方向に直接に重ね合わされていると共に、その上端部において、テーパ筒状部４４の開口周縁部が第二の取付金具１４の内周面に対して、全周に亘って径方向で重ね合わされている。
【００３０】
そして、本体ゴムアウタ筒金具３４のフランジ状部４２の外周縁部に対して、第二の取付金具１４のかしめ筒部２６がかしめ固定されることによって、本体ゴムアウタ筒金具３４と第二の取付金具１４が相互に固定されて組み付けられるようになっている。なお、これら本体ゴムアウタ筒金具３４の上下両端部における第二の取付金具１４との径方向および軸方向での重ね合わせ部位には、それぞれ、本体ゴム弾性体１６またはダイヤフラム３０と一体成形されたシールゴムが介在されており、流体密にシールされている。これにより、本体ゴムアウタ筒金具３４に形成された周溝４５が第二の取付金具１４で流体密に覆蓋されており、以て、本体ゴムアウタ筒金具３４の筒壁部４０と第二の取付金具１４の径方向対向面間を周方向に所定長さで延びる通路が形成されている。
【００３１】
さらに、本体ゴムアウタ筒金具３４の下側開口部には、仕切金具としての仕切板金具５０と蓋部材５２が組み付けられている。蓋部材５２は、支持ゴム弾性体としての略円環板形状の支持ゴム板５４に対して、その中央部分に加振板５６が加硫接着されていると共に、その外周部分に円環状の固定金具５８が加硫接着されており、それら加振板５６と固定金具５８が支持ゴム板５４で弾性的に連結されている。
【００３２】
加振板５６は、円板形状を有していると共に、その外周縁部には上方に向かって突出する円環形状の外周突部が一体形成されており、金属や硬質樹脂等の剛性材によって形成されている。一方、固定金具５８は、円筒形状を有する筒状部６０の上下開口部に対してそれぞれフランジ状に広がる取付板部６２と位置決め突部６４が一体形成されており、取付板部６２の外周縁部には、更に下方に突出する円環形状の環状圧入部６６が一体形成されている。
【００３３】
そして、固定金具５８の径方向内方に離隔して略同一中心軸上に加振板５６が配設されており、これら固定金具５８と加振板５６の径方向対向面間に広がるようにして支持ゴム板５４が配設されている。また、かかる支持ゴム板５４は、その内外周縁部が加振板５６の外周突部と固定金具５８の筒状部６０の対向面に対してそれぞれ加硫接着されており、加振板５６と固定金具５８の間が支持ゴム板５４で流体密に閉塞されている。
【００３４】
一方、仕切板金具５０は、薄肉の円板形状を有しており、その外径寸法が、固定金具５８における取付板部６２の径方向中間部分まで至る大きさとされている。なお、本実施形態では、仕切板金具５０の外径寸法が、第二の取付金具１４における段差部２４の内径寸法よりも所定量だけ小さくされている。また、仕切板金具５０の中央部分は、加振板５６の外径と略同じ大きさの円形領域が略台地形状で上方に突出せしめられており、加振板５６の当接が回避されるようになっている。また、仕切板金具５０には、圧力伝達流路としての流体流通孔６８が、中心軸上を板厚方向に貫設されている。更にまた、仕切板金具５０には、外周縁部近くに位置する周上に３つ以上の係止片４８が、上方に向かって切り起こされて一体形成されている。
【００３５】
そして、仕切板金具５０は、第二の取付金具１４の下側開口部において、そこに組み付けられた本体ゴムアウタ筒金具３４のフランジ状部４２に対して外周縁部が重ね合わされて組み付けられている。更に、第二の取付金具１４の下側開口部には、仕切板金具５０の下方から蓋部材５２が組み付けられており、蓋部材５２における固定金具５８の取付板部６２が、本体ゴムアウタ筒金具３４と仕切板金具５０に重ね合わされて、それぞれの外周縁部が第二の取付金具１４のかしめ筒部２６によってかしめ固定されている。
【００３６】
また、仕切板金具５０は、外径寸法が第二の取付金具１４の段差部２４まで達しておらず、その外周縁部が、段差部２４とかしめ筒部２６の間で直接にかしめ固定された本体ゴムアウタ筒金具３４と固定金具５８（取付板部６２）の間で軸方向に挟持されることにより、第二の取付金具１４によるかしめ力が、それら本体ゴムアウタ筒金具３４と固定金具５８を介して間接的に及ぼされて、仕切板金具５０が第二の取付金具１４に対して固定的に組み付けられている。そこにおいて、仕切板金具５０に一体形成された各係止片４８が、何れも、本体ゴムアウタ筒金具３４に対して開口部から軸方向内方に嵌め込まれており、本体ゴムアウタ筒金具３４の内周面に重ね合わされることによって、軸直角方向に位置決めされている。
【００３７】
また、本体ゴムアウタ筒金具３４のフランジ状部４２には、径方向中間部分において周方向に延びる環状の段付部７０が設けられており、この段付部７０よりも外周部分が段差部２４に重ね合わされている一方、段付部７０よりも内周部分が、取付板部６２から上方に離隔して対向位置する環状挟持部７２とされている。そして、この環状挟持部７２と取付板部６２の間に対して、仕切板金具５０の外周縁部が挿し入れられた状態で、軸方向に挟持固定されている。
【００３８】
すなわち、仕切板金具５０は、第二の取付金具１４に対して直接に位置決めされたり固定されたりしておらず、第二の取付金具１４に対して直接に位置決めされてかしめ固定された本体ゴムアウタ筒金具３４を介して、間接的に、第二の取付金具１４に対して位置決めされて固定されているのである。また、仕切板金具５０の下面には、固定金具５８の取付板部６２が、本体ゴムアウタ筒金具３４よりも径方向内方にまで延び出して仕切板金具５０の下面に重ね合わされている。そして、仕切板金具５０において係止片４８の立ち上げによって開口せしめられた打抜孔６９よりも内周側に位置せしめられた取付板部６２の内周縁部において、支持ゴム板５４と一体形成されて取付板部６２に加硫接着されたシールゴム７３が、取付板部６２と仕切板金具５０の間で挟圧されている。これにより、仕切板金具５０に形成された打抜孔６９が、実質的に流体密に閉塞されているのである。
【００３９】
そうして、第二の取付金具１４の下側開口部が、蓋部材５２で流体密に覆蓋されており、第二の取付金具１４で固定的に支持されて軸直角方向に広がって配設された仕切板金具５０に対して、その上側には、壁部の一部が本体ゴム弾性体１６で構成されて非圧縮性流体が封入された受圧室７４が形成されている。即ち、この受圧室７４には、第一の取付金具１２と第二の取付金具１４の間への振動入力時に本体ゴム弾性体１６の弾性変形に基づいて振動が入力されて圧力変動が惹起されるようになっている。また一方、仕切板金具５０を挟んで受圧室７４と反対の下側には、壁部の一部が加振板５６で構成されて非圧縮性流体が封入された加振室７６が形成されている。この加振室７６は、後述するアクチュエータ７８で加振板５６が加振駆動されることにより、圧力変動が積極的に制御されるようになっている。
【００４０】
また、このように仕切板金具５０を挟んで上下に形成された受圧室７４と加振室７６は、仕切板金具５０の中央に形成された流体流通孔６８を通じて相互に連通されており、加振板５６の加振で加振室７６に生ぜしめられた圧力変動が流体流通孔６８を通じて受圧室７４に及ぼされることにより、受圧室７４の圧力を積極的に制御することが出来るようになっている。
【００４１】
更にまた、本体ゴム弾性体１６とダイヤフラム３０が、それぞれの内周縁部と外周縁部において第一の取付金具１２と第二の取付金具１４に対して直接に固着乃至は後固着されることによって、本体ゴム弾性体１６とダイヤフラム３０の対向面間には、非圧縮性流体が封入された平衡室８０が形成されている。即ち、この平衡室８０は、壁部の一部が変形容易なダイヤフラム３０で構成されており、該ダイヤフラム３０の弾性変形に基づいて容易に容積変化が許容されるようになっているのである。
【００４２】
さらに、第二の取付金具１４と本体ゴムアウタ筒金具３４の間に形成された周方向通路が、その周方向両端部に形成された連通孔８２，８４を通じて受圧室７４と平衡室８０に接続されており、それによって、受圧室７４と平衡室８０を相互に連通せしめて両室７４，８０間での流体流動を許容するオリフィス通路８６が周方向に所定長さで形成されている。また、オリフィス通路８６は、振動入力時に受圧室７４と平衡室８０の間に惹起される圧力差に基づいて内部を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が、例えばエンジンシェイク等の特定の周波数域で有効に発揮されるように、その通路断面積や通路長さが適当に設定されてチューニングされている。
【００４３】
なお、受圧室７４や加振室７６，平衡室８０に封入される非圧縮性流体としては、これら各室７４，７６，８０間で流動せしめられる流体の共振作用に基づいて有効な防振効果を効率的に得ることが出来るように、一般に、０．１Ｐａ．ｓ以下の低粘性流体が好適に採用される。
【００４４】
また一方、蓋部材５２を挟んで受圧室７４と反対側には、アクチュエータ７８が配設されている。このアクチュエータ７８は、一軸方向の加振力を発生し得ることと、発生加振力の周波数や位相を制御可能であることを条件として、従来から公知のものが適宜に採用可能であって、例えば特開平９−８９０４０号公報や特開２００１−１７６５号公報等に記載の電磁式アクチュエータの他、例えば特開平１０−２３８５８６号公報等に記載の空気圧式アクチュエータ等が何れも採用され得る。かかるアクチュエータ７８は、略カップ形状のハウジング８８を備えており、このハウジング８８の開口周縁部に形成されたフランジ部８９が、第二の取付金具１４の段差部２４とかしめ筒部２６の間で挟持されてかしめ固定されることにより、アクチュエータ７８が第二の取付金具１４に対して組み付けられている。
【００４５】
そして、アクチュエータ７８の出力軸９０が、軸方向上方に突出して加振板５６に固着されており、アクチュエータ７８の出力軸９０による軸方向の加振力が加振板５６に及ぼされて、加振板５６が軸方向に往復駆動されるようになっている。
【００４６】
さらに、アクチュエータ７８の外側には、筒形ブラケット９２が外挿されて組み付けられている。この筒形ブラケット９２は、上端開口部にフランジ部９４が形成されていると共に、下端開口部に取付板部９６が形成されており、フランジ部９４が、アクチュエータ７８のハウジング８８のフランジ部９４と共に、第二の取付金具１４の段差部２４とかしめ筒部２６の間で挟持されてかしめ固定されている。また、取付板部９６には、複数の取付用孔（図示せず）が形成されており、これらの取付用孔に挿通される固定ボルトによって、筒形ブラケット９２が、図示しない自動車のボデーに固定されるようになっている。
【００４７】
ここにおいて、第二の取付金具１４と共に荷重や振動の伝達経路となる筒形ブラット９２は、そのフランジ部９４が、本体ゴムアウタ筒金具３４と固定金具５８に対して、重ね合わされている。そして、かかる重ね合わせ部位においては、各部材がゴム弾性体を介することなく、金属同士の当接状態とされており、第二の取付金具１４の段差部２４とかしめ筒部２６で直接にかしめ固定されることによって、第二の取付金具１４に対して強固に固着されている。一方、アクチュエータ７８のハウジング８８は、そのフランジ部８９が、固定金具５８の取付板部６２と筒形ブラケット９２のフランジ部９４の間で、固定金具５８に固着された圧縮ゴム層としての挟持ゴム層９８を介して軸方向で挟圧保持されている。
【００４８】
これにより、第二の取付金具１４や筒形ブラケット９２に及ぼされる振動のアクチュエータ７８への伝達が、挟持ゴム層９８の弾性変形に基づいて緩和されるようになっている。しかも、アクチュエータ７８のハウジング８８のフランジ部８９における寸法誤差の程度は、挟持ゴム層９８の弾性変形で吸収され得て、かしめ筒部２６によるかしめ精度が悪影響を受けることが回避されているのである。
【００４９】
そして、このような構造とされたエンジンマウント１０は、前述の如く、第一の取付金具１２がパワーユニットに取り付けられる一方、第二の取付金具１４が自動車ボデーに取り付けられることにより、パワーユニットとボデーの間に装着されることとなる。そして、かかる装着状態下、第一の取付金具１２と第二の取付金具１４の間に振動が入力されると、本体ゴム弾性体１６の弾性変形に伴って受圧室７４と平衡室８０の間に惹起される圧力差に基づいてオリフィス通路８６を通じて流体流動が生ぜしめられて、かかる流体の共振作用等の流動作用に基づいて受動的な防振効果が発揮される。また、防振すべき振動に応じた周波数や位相でアクチュエータ７８を駆動制御して加振板５６を加振駆動せしめることにより、加振室７６から流体流通孔６８を通じて受圧室７４に圧力変動を及ぼし、受圧室７４の圧力変動を能動制御することにより、入力振動に対して能動的な防振効果を得ることが出来るのである。特に、かかる能動的な防振効果は、オリフィス通路８６を流動せしめられる流体の流動作用に基づく受動的な防振効果が有効に発揮され難い中乃至高周波数域の振動に対しても有効に発揮され得ることとなる。
【００５０】
そこにおいて、本実施形態のエンジンマウント１０では、第二の取付金具１４に対して直接にかしめ固定されているのが、本体ゴムアウタ筒金具３４と固定金具５８，筒形ブラケット９２であり、これらは段差部２４とかしめ筒部２６によるかしめ部位に対して、軸方向で実質的に金属同士の当接で強固にかしめ固定されている。一方、アクチュエータ７８は、そのハウジング８８のフランジ部８９が固定金具５８の取付板部６２と筒形ブラケット９２のフランジ部９４の間で挟持ゴム層９８を介して緩衝的にかしめ固定力が及ぼされて挟圧保持されているのであり、挟持ゴム層９８の弾性に基づいて、第二の取付金具１４からアクチュエータ７８への振動入力が低減され得ることによって、アクチュエータ７８の耐久性の向上や出力特性の安定性の向上が図られ得て、目的とする能動的な防振効果が一層有効に発揮され得るのである。
【００５１】
なお、本実施形態のエンジンマウントでは、固定金具５８に形成された環状圧入部６６の軸方向高さ寸法を適当に設定することにより、アクチュエータ７８のフランジ部８９に及ぼされる軸方向の弾性的な挟持力を容易に調節することも可能である。
【００５２】
また、固定金具５８の取付板部６２は、その外周縁部において軸方向下方に立ち上がる環状圧入部６６が一体形成されており、取付板部６２のかしめ筒部２６に対する圧入面積が有利に確保されるようになっている。それ故、受圧室７４や平衡室８０，加振室７６に非圧縮性流体を封入するに際して、例えば非圧縮性流体中で、本体ゴム弾性体１６の一体加硫成形品を組み付けたダイヤフラム３０の一体加硫成形品における第二の取付金具１４に対して、仕切板金具５０を組み付けると共に、かしめ筒部２６に固定金具５８を圧入固定することにより、受圧室７４や平衡室８０，加振室７６を形成すると同時に非圧縮性流体を封入せしめた後、かかる組付体を非圧縮性流体から取り出し、その後、大気中でアクチュエータ７８や筒形ブラケット９２を組み付けてかしめ加工する作業が容易となる。即ち、固定金具５８に環状圧入部６６を形成したことにより、非圧縮性流体中でかしめ筒部２６に固定金具５８を圧入せしめた際の圧入固定力を強固に安定して得ることが可能となって、固定金具５８の圧入だけで非圧縮性流体が安定して封止され得ることから、その後の大気中でのかしめ固定を一層容易に安定して行うことが可能となるのである。
【００５３】
しかも、固定金具５８に形成された環状圧入部６６は、その軸方向突出先端面が筒形ブラケット９２のフランジ部９４を介して、かしめ筒部２６に当接せしめられてかしめ力が及ぼされるようになっていることから、環状圧入部６６が薄肉であっても、かしめ筒部２６によるかしめ固定力が安定して及ぼされ得る。また、かしめ筒部２６のかしめ部位も、高剛性なフランジ部９４に重ね合わされるようになっていることから、たとえ環状圧入部６６の内周側に空間やゴム弾性体が存在していても、かしめ加工に際しての不必要な変形が防止されて、一層安定したかしめ力が発揮され得ることとなる。
【００５４】
さらに、本実施形態のエンジンマウント１０においては、仕切板金具５０が段差部２４から径方向内方に外れており、本体ゴムアウタ筒金具３４と固定金具５８の間で挟み込まれて固定されていることにより、仕切板金具５０に対するかしめ固定力が、本体ゴムアウタ筒金具３４と固定金具５８を介して、且つ本体ゴムアウタ筒金具３４のフランジ状部４２に加硫接着されたシールゴム層９９を介して、緩衝的に及ぼされているに過ぎない。それ故、仕切板金具５０の寸法誤差が、段差部２４とかしめ筒部２６による本体ゴムアウタ筒金具３４や固定金具５８のかしめ部位におけるかしめ精度に及ぼす悪影響が可及的に回避され得て、一層安定したかしめ固定が実現され得るのである。なお、仕切板金具５０は、第二の取付金具１４に対して軸直角方向で直接に位置決めされる訳ではないが、複数の係止片４８が本体ゴムアウタ筒金具３４の開口部内周面に嵌め込まれて重ね合わされることにより、本体ゴムアウタ筒金具３４を介して、第二の取付金具１４に対して軸直角方向に位置決めされ得る。
【００５５】
要するに、本実施形態では、第二の取付金具１４のかしめ固定部位から、アクチュエータ７８のハウジング８８と仕切板金具５０の両方が実質的に外されていることにより、その分だけかしめ固定する金具の部材点数が減少し、かしめ部位の寸法精度を有利に維持せしめて、安定したかしめ固定を行うことが可能となり、特に第二の取付金具１４に対する固定強度が要求される本体ゴムアウタ筒金具３４や固定金具５８，筒形ブラケット９２には、大きな固定強度を有利に得ることが可能となる。
【００５６】
さらに、特に本実施形態のエンジンマウント１０では、受圧室７４に対してオリフィス通路８６を通じて接続された平衡室８０が、本体ゴム弾性体１６の外側において環状に形成されていることから、マウント中心軸方向でのサイズの大型化を可及的に回避しつつ、平衡室８０を形成することが可能となり、加振板５６の加振駆動に基づく能動的な防振効果と併せて、受圧室７４と平衡室８０の間で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も、有利に得ることが出来る流体封入式マウントが、コンパクトなマウント軸方向サイズで実現可能となるのである。
【００５７】
以上、本発明の一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され得るものであり、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。
【００５８】
例えば、前記実施形態では、仕切板金具５０が配設されることによって、受圧室７４と加振室７６が形成されていたが、仕切板金具を設けることなく全体を一つの受圧室として構成し、かかる受圧室の壁部の一部を本体ゴム弾性体１６で構成すると共に別の一部を加振板５６で構成し、加振板５６をアクチュエータ７８で加振駆動することにより受圧室の圧力を直接に制御するようにしても良い。
【００５９】
また、仕切板金具５０を採用して受圧室７４と加振室７６を形成する場合でも、それら両室７４，７６を連通せしめる流体流通孔６８を、例えば周方向に所定長さで延びる流体流路として形成することも可能であり、要求される防振特性に応じて、かかる流体流通孔６８は適宜に変更設計されることとなる。
【００６０】
更にまた、前記実施形態で採用されていた平衡室８０や、該平衡室８０を受圧室７４に連通せしめるオリフィス通路８６等は、本発明において必須のものではない。その一つの具体的態様を、本発明の第二の実施形態として、図２に例示する。本態様においては、図示されているように、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に対して直接に加硫接着されて一体加硫成形品を構成していると共に、仕切板金具５０の外周縁部が、第二の取付金具１４に対して、固定金具５８や筒形ブラケット９２と共に、直接にかしめ固定されている。また、筒状のベースブラケットとして、有底円筒形状の筒形ブラケット９２の金具が採用されており、底部に植設されたボルトによって、図示しない自動車のボデーに取り付けられるようになっている。なお、図２においては、前記第一の実施形態と同様な構造とされた部材および部位について、それぞれ、図中に第一の実施形態と同一の符号を付することにより、その詳細な説明を省略する。
【００６１】
また、固定金具５８や筒形ブラケット９２を直接にかしめ固定する段差部２４とかしめ筒部２６において、軸方向で実質的に金属同士の当接によるかしめ固定強度が確保され得ることを条件として、封入された非圧縮性流体のシール性を確保するために充分に薄肉のシールゴム層を、段差部２４やかしめ筒部２６の内周面に被着形成しても良い。なお、かかるシールゴム層は、例えばダイヤフラム３０を第二の取付金具１４の内周面に沿って延び出させて一体的に形成することが可能である。
【００６２】
加えて、前記実施形態では、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について説明したが、本発明は、その他、各種の装置や部位に装着される各種の防振装置に対しても、何れも適用可能である。
【００６３】
【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、大きな荷重が及ぼされる筒形ブラケットを第二の取付金具に対して強固にかしめ固定することが出来る一方、アクチュエータを緩衝支持せしめて振動入力に起因する耐久性や作動安定性の低下を軽減乃至は回避することが可能となる。
【図面の簡単な説明】
【図１】本発明の第一の実施形態としての自動車用のエンジンマウントを示す縦断面図である。
【図２】本発明の第二の実施形態としてのエンジンマウント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
２４段差部
２６かしめ筒部
３０ダイヤフラム
３２本体ゴムインナ金具
３４本体ゴムアウタ筒金具
５２蓋部材
５４支持ゴム板
５６加振板
５８固定金具
６２取付板部
６６環状圧入部
７４受圧室
７６加振室
７８アクチュエータ
８０平衡室
８６オリフィス通路
８８ハウジング
９２筒形ブラケット
９８挟持ゴム層[0001]
【Technical field】
The present invention has an actuator that actively controls the pressure of an incompressible fluid enclosed therein, and is an active type fluid enclosure capable of exhibiting an anti-vibration or positive vibration isolation effect based on the operation of the actuator In particular, the present invention relates to a fluid-filled vibration isolator having a novel structure that is suitably employed in, for example, an engine mount and a body mount for automobiles.
[0002]
[Background]
Conventionally, as a kind of anti-vibration coupling body and anti-vibration support body mounted between members constituting the vibration transmission system, the incompressible fluid enclosed inside is controlled by pressure control based on the operation of the actuator. 2. Description of the Related Art An active fluid-filled vibration isolator that exhibits an effective or active vibration isolating effect is known. For example, those disclosed in Patent Document 1 and Patent Document 2 are such.
[0003]
[Patent Document 1]
JP 2000-227137 A
[Patent Document 2]
JP 2002-286082 A
[0004]
That is, an active fluid-filled vibration isolator generally includes a first mounting bracket and a second mounting bracket that are separated from each other on the side of one opening of the substantially cylindrical second mounting bracket. By connecting the mounting bracket with a rubber elastic body, one opening of the second mounting bracket is fluid-tightly closed, while a step is provided on the other opening of the second mounting bracket. A caulking tube portion having a diameter is integrally formed, and the lid member is caulked and fixed by the caulking tube portion to cover the other opening of the second mounting bracket in a fluid-tight manner, so that the main rubber elastic body and the lid member are covered. In this structure, a fluid chamber in which an incompressible fluid is sealed is formed. Further, a vibration plate is elastically supported by a vibration rubber plate at the center portion of the lid member, and the vibration plate is driven by an actuator mounted on the outer side of the lid member. The pressure fluctuation is applied to the fluid chamber.
[0005]
By the way, when mounting the actuator on the second mounting bracket, for example, as described in Patent Documents 1 and 2, the flange portion provided on the actuator housing is connected to the caulking tube portion of the second mounting bracket. Thus, caulking and fixing together with the lid member can be considered.
[0006]
However, when the housing of the actuator is caulked and fixed directly to the second mounting bracket, the vibration of the vibration member exerted on the second mounting bracket is directly transmitted to the actuator. Input vibration may adversely affect durability and assembly accuracy, especially in the case of an actuator that drives an output member with a minute gap such as an electromagnetic drive means, which also adversely affects the stability of output characteristics. There was a risk of being affected.
[0007]
In addition, when the number of members to be caulked and fixed in the caulking and fixing portion with respect to the second mounting bracket is increased, it is difficult to stably obtain the caulking fixing force due to the overlap of the dimensional accuracy of each member. There was also a problem.
[0008]
[Solution]
Here, the present invention has been made in the background as described above, and the solution is to fix the lid member or the like to the second mounting bracket with high precision and stability. It is possible to provide an active fluid-filled vibration isolator having a novel structure in which an actuator for active control can be assembled to the second mounting bracket in a shock-proof manner with a simple structure. .
[0009]
[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.
[0010]
(Aspect 1 of the present invention)
According to the first aspect of the present invention, the first mounting bracket is spaced from one opening side of the substantially cylindrical second mounting bracket, and the first mounting bracket and the second mounting bracket are disposed on the main rubber elastic body. By connecting together, one opening of the second mounting bracket is fluid-tightly closed, while a step portion is provided in the other opening of the second mounting bracket to integrally form a large-diameter caulking tube portion. Then, a lid member in which an annular fixing bracket is bonded to the outer peripheral edge of the vibration rubber plate with the vibration plate bonded to the center portion is disposed in the other opening of the second mounting bracket, and the fixing is performed. A metal fitting is press-fitted into the caulking tube portion and is overlapped and fixed by caulking to the step portion to cover the other opening of the second mounting fitting in a fluid-tight manner, and the main rubber elastic body and the lid member In an active fluid-filled vibration isolator in which a fluid chamber in which an incompressible fluid is sealed is formed, A cylindrical base bracket having a hook-shaped portion at the mouth is adopted, and the hook-shaped portion is overlapped from the outside of the one opening with respect to the fixing bracket, and the caulking cylinder portion together with the fixing bracket. By caulking and fixing the base bracket, Said The annular fitting portion is formed by bending the outer peripheral edge of the fixing fitting to the base bracket side while assembling to the second mounting fitting, and the protruding front end surface of the annular fitting portion is the outer peripheral edge of the bowl-shaped portion. The actuator that exerts an excitation force on the excitation plate while sandwiching the excitation plate directly in the axial direction Said A flange portion is provided on the inner peripheral side of the annular press-fitting portion, and is disposed on the opposite side of the fluid chamber and the housing of the actuator extends in a cylindrical shape toward the fixing bracket and is provided at the opening. In part While being arranged with a gap in the radial direction from the annular press-fit portion, This is that the fixing metal and the flange portion of the base bracket are clamped and supported by applying a caulking fixing force via a compression rubber layer.
[0011]
In such an active fluid-filled vibration isolator having the structure according to this aspect, the hook-like portion of the base bracket for attaching the second attachment member to one member to be anti-vibration connected or the like is a lid member. Based on the elasticity of the compression rubber layer, the actuator housing is clamped and supported between the hook-shaped portion and the fixation bracket through the compression rubber layer. As a result, vibration transmission from the second mounting member to the actuator is alleviated, and thus problems caused by direct vibration transmission to the actuator can be reduced or avoided.
[0012]
Moreover, in this aspect, since the outer peripheral edge part of the fixing bracket is an annular press-fitting part, and the press-fitting surface with respect to the caulking cylinder part is set to be large in the axial direction, for example, in the incompressible fluid, the main rubber When the lid member is assembled to the second mounting bracket whose one opening in the axial direction is covered with an elastic body, the press-fitting area of the fixing bracket with respect to the caulking tube portion can be advantageously ensured, and the other of the second mounting bracket can be secured. The opening can be covered with a lid member with good fluid tightness, and therefore, the assembly in which the fixing member is pressed into the second mounting bracket and the lid member is assembled is taken out from the incompressible fluid. After that, in a state where the fluid tightness of the fluid chamber is stably secured, the actuator housing and the base bracket can be assembled in the atmosphere, and the caulking tube portion can be caulked. It's become easy.
[0013]
Furthermore, since the caulking fixing force in the axial direction by the caulking tube portion is exerted on the annular press-fitting portion protruding from the outer peripheral edge portion of the fixing bracket via the hook-like portion of the base bracket, In this case, the overlapping area of the caulking cylinder part can be advantageously ensured, and unstable deformation of the caulking cylinder part during caulking can be prevented, and the caulking cylinder part is also used for the thin annular press-fitting part. The caulking force can be exerted effectively and stably, and the caulking force effective as a whole is applied to each member.
[0014]
(Aspect 2 of the present invention)
Aspect 2 of the present invention is the active fluid-filled vibration isolator according to aspect 1, wherein a main rubber outer metal fitting is vulcanized and bonded to the outer peripheral portion of the main rubber elastic body, and the outer peripheral edge of the main rubber outer metal fitting is attached to the outer peripheral edge of the main rubber outer metal fitting. The outer peripheral edge of the main rubber elastic body is fixed to the second mounting bracket by overlapping the stepped portion of the second mounting bracket and the fixing bracket and fixing with the caulking tube portion. This is a feature. In this aspect, the second mounting bracket having the caulking tube portion can be formed separately from the main rubber elastic body, and the second mounting bracket can be fixed after vulcanization molding of the main rubber elastic body. Yes, thereby improving the degree of freedom in designing the second mounting bracket and the main rubber elastic plate.
[0015]
(Aspect 3 of the present invention)
Aspect 3 of the present invention is the active fluid-filled vibration isolator according to aspect 1 or 2, in which the first mounting bracket and the second mounting bracket straddle outside the main rubber elastic body. A flexible rubber film that spreads out is provided, and a volume-variable equilibrium chamber having a part of the wall made of the flexible rubber film on the opposite side of the fluid chamber across the main rubber elastic body. It is characterized in that an incompressible fluid is sealed in the equilibration chamber and an orifice passage is formed for communicating the equilibration chamber with the fluid chamber. In this aspect, a passive vibration isolation effect can be obtained based on the resonance action of the fluid that flows between the pressure receiving chamber and the equilibrium chamber when vibration is input.
[0016]
In particular, this aspect is suitably employed in combination with aspect 2. Therefore, for example, a configuration is adopted in which a main rubber inner metal fitting is vulcanized and bonded to a central portion of the main rubber elastic body, and the main rubber elastic body is rear-fixed to the first mounting metal by the main rubber inner metal fitting. For example, a diaphragm made of a thin rubber film formed separately from the main rubber elastic body is formed so as to straddle between the first mounting bracket and the second mounting bracket, and vulcanized and bonded to both the brackets. In addition, a configuration in which the main rubber elastic body is disposed so as to cover the main rubber elastic body can be realized more advantageously. In this embodiment, the orifice passage that allows the pressure receiving chamber and the equilibrium chamber to communicate with each other can be advantageously formed, for example, between the radially overlapping surfaces of the main rubber outer bracket and the second mounting bracket.
[0017]
(Aspect 4 of the present invention)
Aspect 4 of the present invention is the active fluid-filled vibration isolator according to aspect 2 or 3, wherein a partition fitting having a diameter smaller than that of the step portion in the second mounting fitting is accommodated in the fluid chamber, The partition metal is clamped and supported by sandwiching the outer peripheral edge of the partition metal between the main rubber outer metal fitting and the fixing metal via an abutting rubber layer, thereby supporting the fluid chamber. By partitioning with the partition metal, a part of the wall portion is formed of the main rubber elastic body on one side of the partition metal, and a pressure receiving chamber in which a pressure fluctuation is generated at the time of vibration input is formed. On the other side of the partition metal fitting, a part of the wall portion is formed of the vibration plate to form a vibration chamber whose pressure is controlled by the vibration drive of the vibration plate, and the pressure receiving chamber and the pressure plate Formed a pressure transmission channel that connects the vibration chambers to each other , And features.
[0018]
In this aspect, the partition fitting that partitions the pressure receiving chamber and the excitation chamber can be assembled using the caulking fixing portion of the second mounting bracket, and in particular, the partition fitting is a stepped portion and a caulking tube portion. Without the caulking and fixing between the metal directly between the metal fittings between the main body rubber outer fitting and the fixing fitting, and indirectly and elastically with respect to the second mounting fitting with the contact rubber layer interposed Since the caulking is fixed, the size of the caulking fixing portion between the stepped portion and the caulking tube portion does not increase in the axial direction by assembling the divider, and the dimensional error of the dividing metal is given to the caulking fixing portion. The influence can also be avoided, and therefore the partition fitting can be assembled while effectively ensuring stable caulking and fixing accuracy.
[0019]
(Aspect 5 of the present invention)
Aspect 5 of the present invention is the active fluid-filled vibration isolator according to any one of the aspects 1 to 4, wherein the compression rubber layer is disposed on the surface of the actuator on the flange side with respect to the fixing bracket. It is characterized in that it is deposited and formed at a position separated by a predetermined distance on the inner peripheral side from the annular press-fitting portion. In this embodiment, it is possible to easily form the compression rubber layer simultaneously with the vibration rubber plate that is attached to the fixture.
[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 automotive engine mount 10 as a first embodiment of the present invention relating to an active fluid-filled vibration isolator. The engine mount 10 has a structure in which a first mounting bracket 12 and a second mounting bracket 14 are elastically connected by a main rubber elastic body 16, and the first mounting bracket 12 is a power unit of an automobile (not shown). On the other hand, the second mounting bracket 14 is attached to an automobile body (not shown), so that the power unit is supported in an anti-vibration manner with respect to the body. Also, under such a mounted state, between the first mounting bracket 12 and the second mounting bracket 14, the shared load of the power unit and the main vibration to be damped are both substantially shafts of the engine mount 10. It is input in the direction (vertical direction in FIG. 1). In the following description, in principle, the vertical direction refers to the vertical direction in FIG.
[0022]
More specifically, the first mounting bracket 12 has a thick disk shape. Further, the first mounting member 12 has an insertion hole 18 penetrating substantially at the center portion, and a mounting plate portion 20 integrally protruding from the upper surface of the outer peripheral portion. The first mounting bracket 12 is attached to a power unit of an automobile (not shown) by a fixing bolt (not shown) inserted through a bolt through hole 22 penetrating the mounting plate 20.
[0023]
Further, the second mounting bracket 14 has a thin-walled large-diameter cylindrical shape, and an annular plate-shaped stepped portion 24 that spreads outward in the radial direction is formed in the axially lower opening. Further, an annular caulking tube portion 26 that protrudes downward in the axial direction is integrally formed at the outer peripheral edge portion of the step portion 24.
[0024]
And the 1st mounting bracket 12 is arrange | positioned on the substantially identical center axis | shaft, spaced apart in the axial direction upper direction of the 2nd mounting bracket 14, These 1st mounting bracket 12 and 2nd mounting bracket 14 are connected by a diaphragm 30 as a flexible rubber film. The diaphragm 30 is formed of a thin rubber film and has a substantially annular shape extending in the circumferential direction with a curved cross-sectional shape having a large slack so that elastic deformation can be easily allowed. The inner peripheral edge of the diaphragm 30 is vulcanized and bonded to the outer peripheral edge of the first mounting bracket 12, and the outer peripheral edge of the diaphragm 30 is on the upper side in the axial direction of the second mounting bracket 14. Vulcanized and bonded to the periphery of the opening. Thereby, the diaphragm 30 is formed as an integrally vulcanized molded product including the first mounting bracket 12 and the second mounting bracket 14.
[0025]
Further, a separate rubber vulcanized body rubber elastic body 16 is assembled later in the integrally vulcanized molded product, and the first mounting bracket 12 and the second mounting member are attached by the body rubber elastic body 16. The metal fitting 14 is elastically connected.
[0026]
The main rubber elastic body 16 has a large-diameter frustoconical shape as a whole, and a main rubber inner metal fitting 32 is coaxially arranged and vulcanized and bonded to the central portion thereof, and the large-diameter side thereof A main rubber outer cylinder fitting 34 is superposed on the outer peripheral surface of the end portion and vulcanized and bonded.
[0027]
The main rubber inner metal fitting 32 has a substantially truncated conical shape in the opposite direction, and a screw hole 38 that opens to the upper surface is provided at a substantially central portion thereof. On the other hand, the main rubber outer cylinder fitting 34 includes a cylindrical wall portion 40 having a substantially large-diameter cylindrical shape, and a flange-shaped portion 42 that extends radially outward is formed at the lower end in the axial direction of the cylindrical wall portion 40. While being integrally formed, the upper end portion in the axial direction of the cylindrical wall portion 40 is a tapered cylindrical portion 44 that gradually expands as it goes upward in the axial direction. As a result, a circumferential groove 45 is formed on the outer peripheral side of the main rubber outer tubular fitting 34 so as to open to the outer peripheral surface and extend in the circumferential direction with a length of a little less than one round. Then, under the state of being vulcanized and bonded to the main rubber elastic body 16, the reverse tapered outer peripheral surface of the main rubber inner fitting 32 and the tapered cylindrical portion 44 of the main rubber outer cylindrical fitting 34 are spaced apart from each other. The opposing surfaces of the main rubber inner metal fitting 32 and the main rubber outer cylinder metal fitting 34 are elastically connected by the main rubber elastic body 16.
[0028]
Thus, the integrally vulcanized molded product of the diaphragm 30 is assembled to the integrally vulcanized molded product of the main rubber elastic body 16 from above, and the first mounting bracket 12 is assembled to the main rubber inner metal member 32. The second mounting bracket 14 is fitted and fixed to the main rubber outer tube bracket 34, and the diaphragm 30 is spaced outward from the main rubber elastic body 16. The main rubber elastic body 16 is disposed so as to cover the entire outer surface. Thereby, the first mounting bracket 12 and the second mounting bracket 14 are elastically connected by the main rubber elastic body 16.
[0029]
That is, the first mounting bracket 12 is directly superimposed on the upper surface of the main rubber inner bracket 32 and fixed to each other by the connecting bolt 46. In addition, an uneven fitting portion is provided between the overlapping surfaces of the first mounting bracket 12 and the main rubber inner bracket 32, and is positioned in the direction perpendicular to the axis and in the circumferential direction. On the other hand, the outer peripheral edge of the flange-like portion 42 is directly overlapped with the stepped portion 24 of the second mounting member 14 in the axial direction at the lower end of the main rubber outer tubular fitting 34, and the upper end thereof , The peripheral edge of the opening of the tapered tubular portion 44 is overlapped with the inner peripheral surface of the second mounting member 14 in the radial direction over the entire circumference.
[0030]
The caulking tube portion 26 of the second mounting bracket 14 is caulked and fixed to the outer peripheral edge portion of the flange-shaped portion 42 of the main rubber outer tube bracket 34, whereby the main rubber outer tube bracket 34 and the second mounting bracket 14 are fixed to each other and assembled. It should be noted that seal rubber integrally formed with the main rubber elastic body 16 or the diaphragm 30 is respectively provided at the overlapping portions in the radial direction and the axial direction of the second mounting bracket 14 at the upper and lower end portions of the main rubber outer cylinder fitting 34. Is interposed and is fluid tightly sealed. As a result, the circumferential groove 45 formed in the main rubber outer cylinder fitting 34 is fluid-tightly covered with the second attachment fitting 14, and therefore, the cylindrical wall portion 40 of the main rubber outer cylinder fitting 34 and the second attachment fitting. A passage that extends between the 14 radially opposing surfaces in the circumferential direction by a predetermined length is formed.
[0031]
Further, a partition plate fitting 50 and a lid member 52 as a partition fitting are assembled to the lower opening of the main rubber outer tube fitting 34. The lid member 52 has a substantially annular plate-shaped support rubber plate 54 as a support rubber elastic body, and a vibration plate 56 is vulcanized and bonded to the center portion thereof, and an annular fixing is provided on the outer peripheral portion thereof. The metal fittings 58 are vulcanized and bonded, and the vibration plate 56 and the fixed metal fitting 58 are elastically connected by the support rubber plate 54.
[0032]
The vibration plate 56 has a disc shape, and an outer peripheral protrusion portion that protrudes upward is integrally formed on the outer peripheral edge portion thereof, and is made of a rigid material such as metal or hard resin. Is formed by. On the other hand, the fixing bracket 58 is integrally formed with a mounting plate portion 62 and a positioning projection 64 that spread in a flange shape with respect to the upper and lower openings of the cylindrical portion 60 having a cylindrical shape, and the outer peripheral edge of the mounting plate portion 62. An annular press-fit portion 66 having an annular shape that protrudes further downward is formed integrally with the portion.
[0033]
A vibration plate 56 is disposed on substantially the same central axis so as to be spaced inward in the radial direction of the fixing bracket 58 so as to spread between the radial facing surfaces of the fixing bracket 58 and the vibration plate 56. A support rubber plate 54 is provided. Further, the support rubber plate 54 has its inner and outer peripheral edge portions vulcanized and bonded to the outer peripheral protrusion of the vibration plate 56 and the opposing surface of the cylindrical portion 60 of the fixing bracket 58, respectively. A space between the fixing brackets 58 is closed fluid-tightly by a support rubber plate 54.
[0034]
On the other hand, the partition plate fitting 50 has a thin disk shape, and its outer diameter dimension is such that it reaches the middle portion in the radial direction of the mounting plate portion 62 of the fixing fitting 58. In the present embodiment, the outer diameter dimension of the partition plate fitting 50 is made smaller by a predetermined amount than the inner diameter dimension of the step portion 24 in the second mounting bracket 14. In addition, the central portion of the partition plate metal 50 has a circular area that is approximately the same size as the outer diameter of the vibration plate 56 and protrudes upward in a substantially plateau shape, so that the vibration plate 56 is prevented from coming into contact. It is like that. In addition, a fluid circulation hole 68 serving as a pressure transmission channel is provided in the partition plate fitting 50 so as to penetrate the central axis in the plate thickness direction. Furthermore, the partition plate fitting 50 is integrally formed with three or more locking pieces 48 cut and raised upward on the circumference located near the outer peripheral edge.
[0035]
And the partition plate metal fitting 50 is assembled | attached in the lower opening part of the 2nd attachment metal fitting 14 with the outer peripheral part overlapped with the flange-shaped part 42 of the main body rubber outer cylinder metal fitting 34 assembled there. . Further, a lid member 52 is assembled to the lower opening of the second mounting bracket 14 from below the partition plate bracket 50, and the mounting plate portion 62 of the fixing bracket 58 in the lid member 52 is a main rubber outer cylinder bracket. 34 and the partition plate metal 50 are overlapped with each other, and the respective outer peripheral edge portions thereof are caulked and fixed by the caulking tube portion 26 of the second mounting metal 14.
[0036]
Further, the outer diameter of the partition plate metal fitting 50 does not reach the stepped portion 24 of the second mounting bracket 14, and the outer peripheral edge portion thereof is caulked and fixed directly between the stepped portion 24 and the caulking tube portion 26. When the main rubber outer cylinder fitting 34 and the fixing fitting 58 (attachment plate portion 62) are clamped in the axial direction, the caulking force by the second attachment fitting 14 causes the main rubber outer cylinder fitting 34 and the fixing fitting 58 to move. The partition plate bracket 50 is fixedly assembled to the second mounting bracket 14. In this case, each of the locking pieces 48 formed integrally with the partition plate metal fitting 50 is fitted into the main rubber outer cylinder fitting 34 in the axial direction from the opening portion. It is positioned in the direction perpendicular to the axis by being superimposed on the peripheral surface.
[0037]
In addition, the flange-like portion 42 of the main rubber outer tube fitting 34 is provided with an annular stepped portion 70 extending in the circumferential direction at the radially intermediate portion, and the outer peripheral portion of the stepped portion 70 is formed at the stepped portion 24. On the other hand, the inner peripheral portion of the stepped portion 70 is an annular sandwiching portion 72 that is spaced upward from the mounting plate portion 62 and is opposed to the stepped portion 70. And it clamps and fixes to the axial direction in the state which the outer-periphery edge part of the partition plate metal fitting 50 was inserted with respect to between this annular clamping part 72 and the attachment board part 62. As shown in FIG.
[0038]
That is, the partition metal fitting 50 is not positioned or fixed directly with respect to the second mounting bracket 14 but is directly positioned with respect to the second mounting bracket 14 and fixed by caulking. It is positioned and fixed with respect to the second mounting member 14 indirectly via the tube member 34. Further, on the lower surface of the partition plate metal fitting 50, the mounting plate portion 62 of the fixing metal fitting 58 extends radially inward from the main rubber outer tube fitting 34 and overlaps the lower surface of the partition plate metal fitting 50. In the partition plate fitting 50, the support rubber plate 54 is integrally formed at the inner peripheral edge portion of the mounting plate portion 62 positioned on the inner peripheral side with respect to the punching hole 69 opened by raising the locking piece 48. The sealing rubber 73 vulcanized and bonded to the mounting plate 62 is sandwiched between the mounting plate 62 and the partition plate fitting 50. Thereby, the punching hole 69 formed in the partition plate fitting 50 is substantially fluid-tightly closed.
[0039]
Then, the lower opening of the second mounting bracket 14 is covered with a lid member 52 in a fluid-tight manner, and is fixedly supported by the second mounting bracket 14 so as to spread in the direction perpendicular to the axis. A pressure receiving chamber 74 in which a part of the wall portion is formed of the main rubber elastic body 16 and in which an incompressible fluid is enclosed is formed on the upper side of the partition plate fitting 50 thus formed. That is, when pressure is input between the first mounting bracket 12 and the second mounting bracket 14, vibration is input to the pressure receiving chamber 74 based on the elastic deformation of the main rubber elastic body 16 to cause pressure fluctuation. It has become so. On the other hand, on the lower side opposite to the pressure receiving chamber 74 with the partition plate metal fitting 50 interposed therebetween, a vibration chamber 76 is formed in which a part of the wall portion is composed of the vibration plate 56 and in which an incompressible fluid is enclosed. ing. In the vibration chamber 76, the fluctuation of pressure is positively controlled by exciting the vibration plate 56 with an actuator 78 described later.
[0040]
Further, the pressure receiving chamber 74 and the excitation chamber 76 formed above and below the partition plate metal 50 in this way are communicated with each other through a fluid circulation hole 68 formed in the center of the partition plate metal 50. The pressure fluctuation generated in the vibration chamber 76 by the vibration of the vibration plate 56 is exerted on the pressure receiving chamber 74 through the fluid circulation hole 68, so that the pressure in the pressure receiving chamber 74 can be positively controlled. ing.
[0041]
Furthermore, the main rubber elastic body 16 and the diaphragm 30 are directly fixed to the first mounting bracket 12 and the second mounting bracket 14 at the inner peripheral edge portion and the outer peripheral edge portion, respectively, or are fixed rearwardly. Between the opposing surfaces of the main rubber elastic body 16 and the diaphragm 30, an equilibrium chamber 80 in which an incompressible fluid is enclosed is formed. That is, the equilibrium chamber 80 is configured by the diaphragm 30 having a part of the wall portion that is easily deformable, and the volume change is easily allowed based on the elastic deformation of the diaphragm 30.
[0042]
Further, a circumferential passage formed between the second mounting member 14 and the main rubber outer tube member 34 is connected to the pressure receiving chamber 74 and the equilibrium chamber 80 through communication holes 82 and 84 formed at both ends in the circumferential direction. As a result, the pressure receiving chamber 74 and the equilibrium chamber 80 are communicated with each other, and an orifice passage 86 that allows fluid flow between the chambers 74 and 80 is formed in a predetermined length in the circumferential direction. In addition, the orifice passage 86 has a passive vibration isolation effect based on a resonance action of a fluid that is caused to flow inside based on a pressure difference caused between the pressure receiving chamber 74 and the equilibrium chamber 80 when vibration is input. The channel cross-sectional area and the channel length are appropriately set and tuned so as to be effectively exhibited in a specific frequency range such as.
[0043]
As the incompressible fluid sealed in the pressure receiving chamber 74, the vibration chamber 76, and the equilibrium chamber 80, an effective vibration isolation effect is based on the resonance action of the fluid that flows between the chambers 74, 76, and 80. In general, 0.1 Pa. Can be obtained efficiently. A low-viscosity fluid of s or less is preferably employed.
[0044]
On the other hand, an actuator 78 is disposed on the opposite side of the pressure receiving chamber 74 with the lid member 52 interposed therebetween. As this actuator 78, a conventionally known actuator can be appropriately employed on condition that it can generate a uniaxial excitation force and that the frequency and phase of the generated excitation force can be controlled. For example, in addition to the electromagnetic actuators described in JP-A-9-89040, JP-A-2001-1765, etc., any of the pneumatic actuators described in JP-A-10-238586 can be employed. The actuator 78 includes a substantially cup-shaped housing 88, and a flange portion 89 formed on the peripheral edge of the opening of the housing 88 is provided between the stepped portion 24 of the second mounting member 14 and the caulking tube portion 26. The actuator 78 is assembled to the second mounting member 14 by being clamped and fixed.
[0045]
The output shaft 90 of the actuator 78 protrudes upward in the axial direction and is fixed to the vibration plate 56, and the vibration force in the axial direction by the output shaft 90 of the actuator 78 is exerted on the vibration plate 56, The diaphragm 56 is driven to reciprocate in the axial direction.
[0046]
Further, a cylindrical bracket 92 is externally attached to the outside of the actuator 78 and assembled. The cylindrical bracket 92 has a flange portion 94 formed at the upper end opening portion and a mounting plate portion 96 formed at the lower end opening portion, and the flange portion 94 together with the flange portion 94 of the housing 88 of the actuator 78. The second mounting bracket 14 is clamped and fixed between the stepped portion 24 and the caulking tube portion 26. The mounting plate portion 96 is formed with a plurality of mounting holes (not shown), and the cylindrical bracket 92 is attached to a vehicle body (not shown) by fixing bolts inserted through the mounting holes. It is supposed to be fixed.
[0047]
Here, the flange 94 of the cylindrical brat 92 that becomes a transmission path of load and vibration together with the second mounting bracket 14 is overlapped with the main rubber outer cylindrical bracket 34 and the fixing bracket 58. In such an overlapped portion, the members are in contact with each other without the rubber elastic body interposed therebetween, and are directly caulked by the stepped portion 24 and the caulking tube portion 26 of the second mounting bracket 14. By being fixed, it is firmly fixed to the second mounting bracket 14. On the other hand, the housing 88 of the actuator 78 has a flange portion 89 sandwiched between the mounting plate portion 62 of the fixing bracket 58 and the flange portion 94 of the cylindrical bracket 92 as a compression rubber layer fixed to the fixing bracket 58. The pressure is held in the axial direction via the layer 98.
[0048]
Thereby, the transmission of vibrations exerted on the second mounting member 14 and the cylindrical bracket 92 to the actuator 78 is mitigated based on the elastic deformation of the sandwiching rubber layer 98. Moreover, the degree of dimensional error in the flange portion 89 of the housing 88 of the actuator 78 can be absorbed by the elastic deformation of the sandwich rubber layer 98, and the caulking accuracy by the caulking tube portion 26 is avoided from being adversely affected. .
[0049]
In the engine mount 10 having such a structure, as described above, the first mounting bracket 12 is attached to the power unit, while the second mounting bracket 14 is attached to the automobile body, so that the power unit and the body are connected. It will be installed in between. When vibration is input between the first mounting bracket 12 and the second mounting bracket 14 in such a mounted state, the pressure between the pressure receiving chamber 74 and the equilibrium chamber 80 is accompanied by the elastic deformation of the main rubber elastic body 16. A fluid flow is generated through the orifice passage 86 based on the pressure difference caused by the fluid, and a passive vibration-proofing effect is exhibited based on a fluid action such as a resonance action of the fluid. In addition, the actuator 78 is driven and controlled at a frequency or phase corresponding to the vibration to be damped to drive the oscillating plate 56 to vibrate, whereby pressure fluctuations are generated from the oscillating chamber 76 to the pressure receiving chamber 74 through the fluid flow hole 68. Therefore, by actively controlling the pressure fluctuation in the pressure receiving chamber 74, an active vibration isolating effect against the input vibration can be obtained. In particular, such an active vibration isolating effect is effectively exhibited even in the middle to high frequency range where it is difficult to effectively exhibit a passive anti-vibration effect based on the fluid action of the fluid flowing through the orifice passage 86. Can be done.
[0050]
Therefore, in the engine mount 10 of the present embodiment, the main rubber outer cylinder fitting 34, the fixing fitting 58, and the cylindrical bracket 92 are caulked and fixed directly to the second mounting fitting 14, and these are The caulking portion formed by the stepped portion 24 and the caulking tube portion 26 is firmly caulked and fixed by abutment between metals substantially in the axial direction. On the other hand, the flange portion 89 of the housing 88 of the actuator 78 is buffered and caulked by a clamping rubber layer 98 between the mounting plate portion 62 of the fixing bracket 58 and the flange portion 94 of the cylindrical bracket 92. Since the vibration input from the second mounting bracket 14 to the actuator 78 can be reduced based on the elasticity of the sandwiched rubber layer 98, the durability of the actuator 78 can be improved and the output characteristics can be reduced. Therefore, the intended active vibration isolation effect can be more effectively exhibited.
[0051]
In the engine mount of this embodiment, the axial height of the annular press-fit portion 66 formed in the fixing bracket 58 is appropriately set so that the elastic force in the axial direction exerted on the flange portion 89 of the actuator 78 is reduced. It is also possible to easily adjust the clamping force.
[0052]
Further, the mounting plate portion 62 of the fixing bracket 58 is integrally formed with an annular press-fit portion 66 that rises downward in the axial direction at the outer peripheral edge portion thereof, and the press-fit area of the mounting plate portion 62 to the caulking tube portion 26 is advantageously ensured. It has become so. Therefore, when the incompressible fluid is sealed in the pressure receiving chamber 74, the equilibrium chamber 80, and the vibration chamber 76, for example, in the incompressible fluid, the diaphragm 30 in which the integrally vulcanized molded product of the main rubber elastic body 16 is assembled. The partition plate metal fitting 50 is assembled to the second mounting metal fitting 14 in the integrally vulcanized molded product, and the fixing metal fitting 58 is press-fitted and fixed to the caulking tube portion 26, whereby the pressure receiving chamber 74, the equilibrium chamber 80, and the excitation chamber. After the incompressible fluid is sealed at the same time as forming 76, the assembly is taken out from the incompressible fluid, and thereafter, the work of caulking by attaching the actuator 78 and the cylindrical bracket 92 in the atmosphere becomes easy. . That is, by forming the annular press-fit portion 66 in the fixing metal 58, it is possible to obtain a strong and stable press-fit fixing force when the fixing metal 58 is press-fitted into the caulking tube portion 26 in an incompressible fluid. Thus, since the incompressible fluid can be stably sealed only by press-fitting the fixing metal 58, the subsequent caulking and fixing in the atmosphere can be performed more easily and stably.
[0053]
In addition, the annular press-fit portion 66 formed in the fixing metal 58 has its axially protruding front end surface abutted against the caulking tube portion 26 via the flange portion 94 of the tubular bracket 92 so that a caulking force is exerted. Therefore, even if the annular press-fit portion 66 is thin, the caulking fixing force by the caulking tube portion 26 can be exerted stably. Further, since the caulking portion of the caulking tube portion 26 is also superimposed on the highly rigid flange portion 94, even if a space or a rubber elastic body exists on the inner peripheral side of the annular press-fit portion 66. Unnecessary deformation during caulking is prevented, and a more stable caulking force can be exhibited.
[0054]
Furthermore, in the engine mount 10 of the present embodiment, the partition plate fitting 50 is detached radially inward from the step portion 24 and is fixed by being sandwiched between the main rubber outer tube fitting 34 and the fixing fitting 58. Thus, the caulking fixing force with respect to the partition plate metal fitting 50 is buffered through the main rubber outer cylinder fitting 34 and the fixing metal fitting 58 and through the seal rubber layer 99 vulcanized and bonded to the flange-like portion 42 of the main rubber outer cylinder fitting 34. It has only been affected. Therefore, an adverse effect on the caulking accuracy of the main rubber outer cylinder fitting 34 and the fixing fitting 58 by the stepped portion 24 and the caulking cylinder portion 26 due to the dimensional error of the partition plate fitting 50 can be avoided as much as possible. Stable caulking and fixing can be realized. The partition plate fitting 50 is not directly positioned with respect to the second mounting fitting 14 in the direction perpendicular to the axis, but a plurality of locking pieces 48 are fitted into the inner peripheral surface of the opening of the main rubber outer tubular fitting 34. By being overlapped with each other, they can be positioned in a direction perpendicular to the axis with respect to the second mounting member 14 via the main rubber outer tube member 34.
[0055]
In short, in the present embodiment, since both the housing 88 of the actuator 78 and the partition plate metal 50 are substantially removed from the caulking and fixing portion of the second mounting metal 14, the metal caulking that is caulked and fixed accordingly. The number of members is reduced, the dimensional accuracy of the caulking portion is advantageously maintained, and stable caulking can be performed. In particular, the main rubber outer tube bracket 34 and the fixing that require the fixing strength to the second mounting bracket 14 are fixed. A large fixing strength can be advantageously obtained for the metal fitting 58 and the cylindrical bracket 92.
[0056]
Further, particularly in the engine mount 10 of the present embodiment, since the equilibrium chamber 80 connected to the pressure receiving chamber 74 through the orifice passage 86 is formed in an annular shape outside the main rubber elastic body 16, the mount center axis It is possible to form the equilibrium chamber 80 while avoiding an increase in size in the direction as much as possible. The pressure receiving chamber 74 is combined with an active vibration isolation effect based on the vibration drive of the vibration plate 56. In addition, a passive vibration-proofing effect based on the resonance action of the fluid flowing between the fluid and the equilibrium chamber 80 can be advantageously obtained, and a fluid-filled mount can be realized with a compact mount axial size.
[0057]
As mentioned above, although one embodiment of the present invention has been described in detail, this is merely an example, and the present invention is not construed as being limited in any way by the specific description in the embodiment. The present invention can be carried out in a mode in which various changes, corrections, improvements, etc. are added based on the knowledge of the trader, and any of such embodiments does not depart from the gist of the present invention. Needless to say, it is included in the range.
[0058]
For example, in the above-described embodiment, the pressure receiving chamber 74 and the vibration chamber 76 are formed by disposing the partition plate fitting 50, but the whole is configured as one pressure receiving chamber without providing the partition plate fitting. In addition, a part of the wall portion of the pressure receiving chamber is constituted by the main rubber elastic body 16 and another part is constituted by the vibration plate 56, and the vibration plate 56 is driven to be excited by an actuator 78. The pressure may be directly controlled.
[0059]
Further, even when the pressure receiving chamber 74 and the excitation chamber 76 are formed by adopting the partition plate fitting 50, the fluid flow hole 68 that communicates both the chambers 74 and 76 is, for example, a fluid flow extending a predetermined length in the circumferential direction It is also possible to form the channel, and the fluid circulation hole 68 is appropriately modified and designed according to the required vibration isolation characteristics.
[0060]
Furthermore, the equilibrium chamber 80 employed in the above-described embodiment, the orifice passage 86 that communicates the equilibrium chamber 80 with the pressure receiving chamber 74, and the like are not essential in the present invention. One specific aspect is illustrated in FIG. 2 as a second embodiment of the present invention. In this embodiment, as shown in the drawing, the first mounting bracket 12 and the second mounting bracket 14 are directly vulcanized and bonded to the main rubber elastic body 16 to form an integrally vulcanized molded product. In addition, the outer peripheral edge portion of the partition plate metal fitting 50 is directly caulked and fixed together with the fixing metal fitting 58 and the cylindrical bracket 92 to the second mounting metal fitting 14. Further, as a cylindrical base bracket, a metal fitting of a cylindrical bracket 92 having a bottomed cylindrical shape is adopted, and is attached to a body of an automobile (not shown) by a bolt planted at the bottom. In FIG. 2, members and parts having the same structure as those of the first embodiment are denoted by the same reference numerals as those of the first embodiment, and detailed descriptions thereof are given. Omitted.
[0061]
In addition, in the stepped portion 24 and the caulking tube portion 26 that directly caulking and fixing the fixing bracket 58 and the cylindrical bracket 92, on the condition that the caulking fixing strength due to the contact between metals can be substantially secured in the axial direction. A sufficiently thin sealing rubber layer may be formed on the inner peripheral surface of the stepped portion 24 or the caulking tube portion 26 in order to ensure the sealing performance of the enclosed incompressible fluid. The seal rubber layer can be integrally formed by extending the diaphragm 30 along the inner peripheral surface of the second mounting bracket 14, for example.
[0062]
In addition, in the said embodiment, although the specific example of what applied this invention to the engine mount for motor vehicles was demonstrated, this invention is with respect to the various vibration isolators mounted | worn with various apparatuses and parts. Both are applicable.
[0063]
【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 cylindrical bracket to which a large load is applied can be firmly caulked and fixed to the second mounting bracket. On the other hand, it is possible to reduce or avoid a decrease in durability and operational stability caused by vibration input by buffering and supporting the actuator.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an automobile engine mount as a first embodiment of the present invention.
FIG. 2 is a longitudinal sectional view showing an engine mount as a second embodiment of the present invention.
[Explanation of symbols]
10 Engine mount
12 First mounting bracket
14 Second mounting bracket
16 Body rubber elastic body
24 steps
26 Caulking tube
30 Diaphragm
32 Body rubber inner bracket
34 Body rubber outer tube bracket
52 Lid member
54 Support rubber plate
56 Excitation plate
58 Fixing bracket
62 Mounting plate
66 Annular press-fit part
74 Pressure receiving chamber
76 Excitation room
78 Actuator
80 equilibrium room
86 Orifice passage
88 housing
92 Cylindrical bracket
98 Nipping rubber layer

Claims

The first mounting bracket is spaced from one opening side of the substantially cylindrical second mounting bracket, and the first mounting bracket and the second mounting bracket are connected by a rubber elastic body. While one opening of the second mounting bracket is fluid-tightly closed, a step portion is provided in the other opening of the second mounting bracket to integrally form a large-diameter caulking tube portion, and the center portion is vibrated. A lid member in which an annular fixing bracket is bonded to the outer peripheral edge of the vibration rubber plate to which the plate is bonded is disposed in the other opening of the second mounting bracket, and the fixing bracket is attached to the caulking tube portion. The other opening of the second mounting bracket is covered fluid-tightly by press-fitting and overlapping and fixing to the stepped portion, and an incompressible fluid is interposed between the main rubber elastic body and the lid member. In an active fluid-filled vibration isolator that forms a fluid chamber filled with
A cylindrical base bracket having a hook-shaped portion at one opening is adopted, and the hook-shaped portion is overlapped with the fixing bracket from the outside of the one opening portion and the caulking cylinder together with the fixing bracket. by caulking in parts, with mounting the base bracket to the second mounting member, to form a cyclic pressed portion the outer peripheral edge portion of the fixing member is bent to the base bracket side, the annular press-fit portion projecting one to directly superimposed in the axial direction with respect to the outer peripheral edge of the collar-like portion of the distal end surface, opposite to the fluid chamber of the actuator to exert a pressure force on the oscillating plate across the pressurized oscillation plate of And a flange portion provided at the opening of the actuator housing so as to extend in a cylindrical shape toward the fixing bracket, at the portion located on the inner peripheral side of the annular press-fit portion. Gap in the radial direction While it disposed in Te, active type hydraulic proof, characterized in that it allowed nipping support exerts a caulking force through the compression rubber layer between the flange portion of said fixing member and said base bracket Shaker.

A main rubber outer metal fitting is vulcanized and bonded to the outer peripheral portion of the main rubber elastic body, and the outer peripheral edge portion of the main rubber outer metal fitting is overlapped between the stepped portion of the second mounting metal fitting and the fixing metal fitting. The active fluid-filled vibration isolator according to claim 1, wherein the outer peripheral edge of the main rubber elastic body is fixed to the second mounting bracket by caulking and fixing with a cylindrical portion.

A flexible rubber film extending across the first mounting bracket and the second mounting bracket on the outside of the main rubber elastic body, and the fluid chamber between the main rubber elastic body and the fluid chamber; On the opposite side, a variable volume equilibrium chamber is formed with a part of the wall made of the flexible rubber film. An incompressible fluid is sealed in the equilibrium chamber, and the equilibrium chamber communicates with the fluid chamber. The active fluid-filled vibration isolator according to claim 2, wherein an orifice passage is formed.

A partition metal having a diameter smaller than that of the stepped portion of the second mounting metal is accommodated in the fluid chamber, and an abutting rubber sandwiching an outer peripheral edge of the partition metal between the main rubber outer metal and the fixing metal. The partition metal fitting is clamped and supported by exerting a caulking fixing force through the layer, and the fluid chamber is partitioned by the partition metal fitting so that a part of the wall portion is placed on one side of the partition metal fitting. The main body rubber elastic body is used to form a pressure receiving chamber in which pressure fluctuation is generated when vibration is input, and on the other side of the partition metal fitting, a part of the wall portion is formed of the vibration plate. The active chamber according to claim 2 or 3, wherein an excitation chamber whose pressure is controlled by an excitation drive of the excitation plate is formed, and a pressure transmission flow path that connects the pressure receiving chamber and the excitation chamber to each other is formed. Type fluid-filled vibration isolator.

5. The compression rubber layer according to claim 1, wherein the compression rubber layer is attached to the fixing bracket at a position separated from the annular press-fitting portion by a predetermined distance on the flange side surface of the actuator. The active fluid-filled vibration isolator according to any one of the above.