JP3648575B2

JP3648575B2 - Liquid-filled vibration isolator

Info

Publication number: JP3648575B2
Application number: JP18913195A
Authority: JP
Inventors: 幸夫高島
Original assignee: Toyo Tire and Rubber Co Ltd
Current assignee: Toyo Tire Corp
Priority date: 1995-07-25
Filing date: 1995-07-25
Publication date: 2005-05-18
Anticipated expiration: 2015-07-25
Also published as: JPH0942370A

Description

【０００１】
【発明の属する技術分野】
本発明は、主として自動車のエンジン等のパワーユニットその他の振動発生体を防振的に支承するのに使用される液封入式防振装置に関する。
【０００２】
【従来の技術】
自動車エンジン等の振動発生体を、その振動を車体へ伝達させないように支承するマウント等の液体封入式の防振装置には、例えば、図４に示す液封入式防振マウント(100) がある。
【０００３】
この液封入式防振マウント(100) は、振動発生体側と支持側にそれぞれ締結される上側取付金具(101) と本体金具(102) とを、ゴム弾性体よりなる厚肉の防振基体(103) を介して結合してなり、この防振基体(103) と、その下部に加硫接着により取着された筒状の上部金具(104) 及び該上部金具(104) の開口下端に結合されたハット状の下部金具(105) よりなる本体金具(102) との間に内部空間が形成されている。この内部空間は、周縁部にフランジ(106) が延設され外周にオリフィス形成用の凹溝(107) が設けられた剛性材よりなる仕切部材(108) によって、軸方向の２つの液室(109) (110) に区切られており、それら両室(109) (110) は、防振基体(103) に連なって上部金具(104) 内周面に薄膜状に加硫接着されたシールゴム(111) と上記凹溝(107) との間に形成されたオリフィスを介して連通されている。また、下部金具(105) の内面には、周縁に補強用のリング状金具(112) が埋設された薄肉ゴムのダイヤフラム(113) が、当該下部金具(105) の開口部に位置するように取着けられて、その上方に液体の封入された上記２つの液室(109) (110) が形成されている。
【０００４】
上部金具(104) と下部金具(105) との結合部は、図５に示すように、それぞれの外周端部が径方向に延設され、この延設された両周縁部の間に仕切部材(108) のフランジ(106) とダイヤフラム(113) の周縁とが挾まれ、さらに、これら結合部の両周縁部を相対する方向に折り曲げて包み込む状態にかしめ締結している。ここで、仕切部材(108) のフランジ(106) の上下両面には、それぞれ上部金具(104) 内面及びリング状金具(112) 上面に加硫接着されたシールゴム(111) (114) が、下部金具(105) の開口部内面には、リング状金具(112) に加硫接着されたシールゴム(114) がそれぞれ当接し、かつ、それらシールゴム(111) (114) が前記かしめ締結によって所定の寸法まで変形して、液室(109) (110) 内の液体のシール性能を発揮させている。
【０００５】
この防振マウント(100) では、オリフィスによる両液室(109) (110) の液流動効果や防振基体(103) の防振効果によって、低速時に発生する振幅の大きい低周波振動に対する振動減衰機能と、高速時に発生する高周波振動に対する振動絶縁機能とを果すように構成している。
【０００６】
【発明が解決しようとする課題】
しかしながら、上述した防振マウント(100) においては、ダイヤフラム(113) 、特にその本体金具(102) への取付け端部が、液室(109) (110) 内の液体をシールするシール部分の近傍に位置しているため、上側取付金具(101) 及び本体金具(102) の相対的な大変位による、封入液の液圧急上昇又は急降下、あるいはその繰り返しによって、前記シール性能が劣化し、封入液内に空気が混入することがある。
【０００７】
特に、上述したような、仕切部材(108) とリング状部材(112) とをシールゴム(111) (114) を介してかしめ締結したものでは、前記大変位によりシール部分がより劣化しやすい。
【０００８】
そこで、本発明は上記問題点に鑑み、大変位による封入液の液圧変化に耐え、シール性能の劣化の起りにくい液封入式防振装置を提供することを目的とする。
【０００９】
【課題を解決するための手段】
本発明の請求項１の液封入式防振装置は、筒状胴部を有する本体金具と上側取付金具とをゴム弾性体からなる防振基体を介して結合し、防振基体と対向するダイヤフラムを本体金具に取着してこれらが室壁の一部をなす液封入室を形成し、この液封入室を２つの液室に仕切る剛性材よりなる仕切部材を配し、前記２つの液室をオリフィスにより連通した液封入式防振装置において、前記本体金具の内周に、剛性材よりなる補強部材を有する筒状ゴム部材が嵌着され、前記筒状ゴム部材の一端部が、前記本体金具の一端部において前記仕切部材とともにかしめ締結され、前記筒状ゴム部材の他端部に前記ダイヤフラムが配されており、前記補強部材は、筒状をなし、前記一端部において外方に延設されたフランジを有して該フランジが前記仕切部材とともにかしめ締結されるとともに、前記他端部において内側に折曲延成されてこの折曲部の内端に前記ダイヤフラムが連続して形成され、前記仕切部材は、前記筒状ゴム部材の内周に嵌着される有底筒状をなし、その軸方向の一端部に前記補強部材のフランジとともにかしめ締結される外方に折曲延成されたフランジを備えるとともに、軸方向の他端部が前記筒状ゴム部材の前記他端部における前記折曲部近傍の内周面に圧着されたものである。
【００１０】
請求項２の液封入式防振装置は、請求項１において、前記仕切部材は、外周面にオリフィス形成用の凹溝を備えて、該凹溝の上縁部と下縁部とを前記筒状ゴム部材の内周面に圧着されることで、該凹溝の外方に前記オリフィスが形成されたものである。
【００１１】
請求項３の液封入式防振装置は、請求項１又は２において、前記したかしめ締結が、前記筒状ゴム部材の前記補強部材と前記仕切部材とをかしめた、弾性体を含まない剛性構造であり、前記液封入室をシールするシール部を、各剛性材間に配したシールゴムにより構成し、前記のかしめ締結によるかしめ部に近接させたものである。
【００１２】
請求項４の液封入式防振装置は、請求項１〜３のいずれかにおいて、前記本体金具内に、前記ダイヤフラム、前記仕切部材及び前記２つの液室の全てを収納したものである。
【００１３】
請求項５の液封入式防振装置は、請求項１〜３のいずれかにおいて、前記本体金具は、段部を介して下側の筒状胴部とそれよりも径大の上側の筒状胴部とを備えてなり、前記筒状ゴム部材は、その上端部が前記本体金具の上端部において前記仕切部材とともにかしめ締結され、下端部に前記ダイヤフラムが配されるとともに、前記補強部材の前記折曲部において前記本体金具の前記段部に圧接されるよう構成されており、前記折曲部の下面側に前記段部に圧接されるシールゴムが膨出形成されたものである。
【００１４】
【作用】
請求項１の液封入式防振装置では、例えば、本体金具の上端部に、筒状ゴム部材の上端部と仕切部材とがかしめ締結されて、この本体金具の上端部に、ダイヤフラムと仕切部材との固着効果を担うかしめ部と、液封入室をシールするシール部とが配される。一方、ダイヤフラムの本体金具への取付け部は、本体金具内周に嵌着された筒状ゴム部材の下端部にダイヤフラムが配されているため、前記かしめ部及びシール部とは引離されている。そのため、大変位によって液圧変化が生じてダイヤフラムが膨出変形しても、その力が、本体金具に嵌合した筒状ゴム部材によって遮断され、シール部まで伝達しない。これにより、シール部の動きが規制されて、シール性能が劣化しにくい。しかも、仕切部材が筒状ゴム部材の内周に嵌着されているので、仕切部材が筒状ゴム部材を本体金具内周面に押し当てて、筒状ゴム部材と本体金具との密着性が優れる。
【００１５】
請求項２の液封入式防振装置では、仕切部材を筒状ゴム部材の内周面に圧着されることで、その外周にオリフィスを形成することができる。
【００１６】
請求項３の液封入式防振装置では、かしめ部が剛性材のみをかしめた剛性構造であり、その近傍に、各剛性材間にシールゴムを配することによりシール部を形成しているので、かしめ部における各部材の固着効果が高く、また、かしめ締結によるシールゴムの押圧変形によりシール性能も高い。
【００１７】
請求項４の液封入式防振装置では、本体金具内に、ダイヤフラム、仕切部材及び２つの液室の全てを収納しているので、シール部の動きがより規制される。
【００１８】
請求項５の液封入式防振装置では、筒状ゴム部材と本体金具との間のシール性が、筒状ゴム部材の下端部に配されたシールゴムの、上記かしめ締結による段部への押圧変形により、さらに向上される。
なお、本発明の液封入式防振装置においては、前記上側取付金具をその全周にわたって外方に延成するとともに、この延成した延成部に当接可能な当接部を前記本体金具と一体に動作するように設けて、振動に伴う防振基体の大変位時に、前記延成部が前記当接部に当接して前記防振基体の一定以上の変位を防止するようにしてもよく、これにより、大変位による液圧変化を低減させて、シール性能の経時劣化を低減させることができる。
【００１９】
【発明の実施の形態】
以下、本発明の実施の形態を図面を参照して説明する。
【００２０】
図１は、本発明に係る液封入式防振装置の一例の縦断面図を示している。
【００２１】
図において、（１）は筒状胴部を有する有底の本体金具で、底部に取付用ボルト（11）が突設されている。（２）は圧入あるいは溶接により固着された取付用ボルト（21）を有する上側取付金具であり、両金具のいずれか一方、主として上側取付金具（２）が自動車エンジン等の振動発生体側に締結され、また本体金具（１）が車体のシャーシー等の支持側に締結されて使用される。
【００２２】
本体金具（１）は、底部と当該底部から上方に延設された筒状胴部とよりなる取付部（12）と、その上端より段部（13）を介して上方に延設されたやや径大の筒状胴部よりなる本体部（14）とよりなり、両者が一体に成形されている。段部（13）は、底部よりに位置しており、即ち、本体部（14）の方が、取付部（12）よりも軸方向寸法が長くなっている。そして、本体部（14）の上端には、その全周にわたって外方にフランジ（15）が延設されている。
【００２３】
上側取付金具（２）は、図に示すように略コマ形状をなし、その軸方向中央部にて全周にわたって外方に突出するストッパー部（22）を有する。取付用ボルト（21）は、上側取付金具（２）の上方からその軸方向と所定の鋭角をなして挿入されている。
【００２４】
（３）は、本体金具（１）と上側取付金具（２）に介在されるゴム弾性体よりなる厚肉の防振基体であり、図に示すように略傘形状をなしており、その上部には上側取付金具（２）が埋設され、下端部には本体金具（１）上端の開口部に配されたリング状の補助金具（４）が接着固定されている。これら金具（２）（４）は、防振基体（３）の加硫成形と同時に埋設又は接着固定されてなる。
【００２５】
補助金具（４）は、本体金具（１）のフランジ（15）と同一外径を有する外周部とこの外周部の内端から下方に屈曲して傾斜した内周部とよりなり、この屈曲した部分の下面側には、図２に示すように、断面略半円形状のシールゴム（41）が配されている。
【００２６】
（５）は、筒状胴部を有する結合金具であり、本体金具（１）上端のフランジ（15）にかしめ手段により結合されて、本体金具（１）とともに防振基体（３）を収納するケースを構成する。この結合金具（５）の上端部には、内側に折曲延成されたストッパー用の内フランジ（51）が設けられており、振動に伴なう本体金具（１）の上方への大変位時に、上側取付金具（２）のストッパー部（22）が、この内フランジ（51）に全周にわたって当接するようになっている。そして、内フランジ（51）の内側を上側取付金具（２）の上端部が貫通している。なお、ストッパー部（22）は、防振基体（３）から連なったゴム（31）に包被されており、このゴム（31）が前記内フランジ（51）との当接時の衝撃を緩和している。
【００２７】
（６）は、本体金具（１）の内周面に配された円形ゴム膜よりなるダイヤフラムであり、本体金具（１）の段部（13）とほぼ同一平面上にて、防振基体（３）と対向するように取着されている。このダイヤフラム（６）と本体金具（１）の本体部（14）と防振基体（３）とに囲まれた空間が、液体が充満された液封入室（７）として形成されている。そして、ダイヤフラム（６）下方には、本体金具（１）の取付部（12）との間に空気室（71）が形成されており、当該ダイヤフラム（６）が膨出変形可能になっている。
【００２８】
ダイヤフラム（６）は、内部に筒状の補強金具（61）を埋設して補強した筒状ゴム部材（62）と一体に形成され、該筒状ゴム部材（62）が本体部（14）内周面に嵌着されている。補強金具（61）は、上端が外方に延設されたフランジ（63）を有し、このフランジ（63）が、本体金具（１）のフランジ（15）と同一外径を有し、該フランジ（15）上に配されている。また、補強金具（61）の下端は内側に折曲延成されており、この折曲部の内端にダイヤフラム（６）が連続して形成されており、更に、該折曲部が筒状ゴム部材（62）のゴムを介して段部（13）に圧接されている。
【００２９】
補強金具（61) のフランジ（63）は、図２に示すように、筒状ゴム部材（62）のゴム部分から露出している。また、補強金具（61）上端の折曲部には、その内面側及び外面側に、筒状ゴム部材（62）の上端部が膨出してなるシールゴム（64）が形成されている。さらに、補強金具（61）下端の折曲部の下面側にも、段部（13）に圧接されるシールゴム（65）が膨出形成されている。
【００３０】
（８）は、液封入室（７）を軸方向の上下２つの液室（7a）（7b）に仕切る剛性材よりなる仕切部材であり、ダイヤフラム（６）と一体の筒状ゴム部材（62）の内周に嵌着されている。この仕切部材（８）は、扁平な有底筒状に形成されており、その上端部には、外方に折曲延成され本体金具（１）のフランジ（15）と同一外径を有するフランジ（81）が形成されており、このフランジ（81）が、補強金具（61）のフランジ（63）上に配されている。また、仕切部材（８）の外周面には、オリフィス形成用の凹溝（82）が折曲して形成されており、その下端部が内方かつ上方に折返されて中央の板状部に至る。そして、この折返された下端部と凹溝（82）の上縁部とが筒状ゴム部材（62）の内周面に圧着されて、前記凹溝（82）の外方に上下の液室（7a）（7b）を連通するオリフィス（83）が螺旋状に形成されている。なお、この仕切部材（８）の下端部は、補強金具（61）下端の折曲部付近にて筒状ゴム部材（62）と当接している。
【００３１】
図２に示すように、本体金具（１）と結合金具（５）とを結合する際には、本体金具（１）のフランジ（15）上に、補強金具（61）と仕切部材（８）の各フランジ（63）（81）、更に補助金具（４）の外周部を順次重合して、それらの外端を結合金具（５）の下端部で包み込むようにかしめ締結する。これにより、図３に示すように、かしめ締結されたかしめ部（16）では、剛性材のみがかしめつけられて保形性を維持することができる。また、シールゴム（41）（64）が押圧変形されてかしめ部（16）の内方かつ近傍にシール部（17）が形成され、これにより各金具間がシールされる。
【００３２】
（23）は、上側取付金具（２）の上面にネジ締結等の手段により固着されたストッパー部材であって、中央に取付用ボルト（21）が貫通する孔を有する円板状の金属板（24）の外周端部に、外周部が軸方向下方に向ってスカート状に延成したゴムカバー（25）が付設されており、振動に伴なう上側取付金具（２）の下方への大変位時に、金属板（24）の外周端部分が結合金具（５）の内フランジ（51）の上面に対しゴムカバー（25）を介して当接し、当接時の衝撃を緩和するように設けられている。
【００３３】
上記構成の液封入式防振装置の使用状態においては、エンジン等の振動に伴う防振基体（３）の変形及び２つの液室（7a）（7b）の容積変化により、内部の液体がオリフィス（83）を通じて流動し、低周波振動は防振基体（３）とオリフィス（83）の流動抵抗及び液体の粘性により吸収されて減衰し、また高周波振動は防振基体（５）及び液体自体の共振作用により吸収されて振動を低減する。
【００３４】
この時、上側取付金具（２）の振動の変位量が大きくなったとき、例えば上方への大変位時には、上側取付金具（２）のストッパー部（22）が結合金具（５）の内フランジ（51）に当接してそれ以上の変位が規制される。また、下方への大変位時には、上側取付金具（２）の上面に設けたストッパー部材（23）が内フランジ（51）に当接してそれ以上の変位を抑止する。
【００３５】
本防振装置であれば、ダイヤフラム（６）と仕切部材（８）とを、取付部（12）と本体部（14）とが一体成形された本体金具（１）の上端にかしめ締結するとともに、その液室（7a）（7b）をシールするシール部（17）をそのかしめ部（16）に近接させ、かつ、その本体金具（１）内に、ダイヤフラム（６）、仕切部材（８）及び２つの液室（7a）（7b）を全て収納しているので、シール部（17）は、大変位による液圧変化に対しても動くことなく、よって、シール性不足になりにくく、シール性能の経時劣化を最小に止めることができる。
【００３６】
これは、前記液圧変化に際して負荷がかかりやすいダイヤフラム（６）の本体金具（１）への取付け部が、かしめ部（16）及びシール部（17）から引離され、さらに、このかしめ部（16）から前記取付け部までは、本体金具（１）の内周面に嵌着された筒状ゴム部材（62）によってシールされているためである。これにより、前記液圧変化によってダイヤフラム（６）が変形し、その変形による力が前記取付け部にかかっても、その力は、筒状ゴム部材（62）と本体金具（１）との嵌合によって遮断され、シール部（17）まで伝わらない。
【００３７】
また、筒状ゴム部材（62）の内周には仕切部材（８）が嵌着されて、筒状ゴム部材（62）の本体金具（１）に対する密着性が向上されている。この筒状ゴム部材（62）と本体金具（１）との間のシール性は、筒状ゴム部材（62）の下端部に配されたシールゴム（65）の、上記かしめ締結による段部（13）への押圧変形により、さらに向上されている。
【００３８】
また、かしめ部（16）が剛性材のみによりかしめつけられており、かつ、その近傍に配されたシール部（17）が、これら剛性材間をシールゴム（41）（64）を押圧変形させることにより形成されているので、かしめ部（16）の固着効果が高く、またシール性能も高い。
【００３９】
さらに、ストッパー部（21）が上側取付金具（３）の全周に設けられているため、防振基体（５）が少々横方向に変形したり歪んだりしても、内フランジ（51）に広い範囲で当接できるため、ストッパー抜けや変形等を確実に防止できる。
【００４０】
【発明の効果】
本発明の液封入式防振装置であると、防振基体の大変位によって液圧変化が生じても、液封入室をシールするシール部の動きが規制されるので、シール性能が劣化しにくい。すなわち、大変位による封入液の液圧変化に耐え、シール性能の経時劣化を最小に止めることができる。
【図面の簡単な説明】
【図１】本発明の一実施例の液封入式防振装置の縦断面図である。
【図２】上記実施例においてかしめ部を分解して示した要部分解断面図である。
【図３】上記実施例におけるかしめ部の要部拡大縦断面図である。
【図４】従来の液封入式防振装置の一例を示す縦断面図である。
【図５】従来の液封入式防振装置のかしめ部の要部拡大縦断面図である。
【符号の説明】
（１）……本体金具
（２）……上側取付金具
（３）……防振基体
（６）……ダイヤフラム
（７）……液封入室
（８）……仕切部材
（16）……かしめ部
（17）……シール部
（22）……ストッパー部
（23）……ストッパー部材
（41）（64）……シールゴム
（51）……ストッパー用の内フランジ
（61）……補強金具
（62）……筒状ゴム部材
（83）……オリフィス[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a liquid-filled vibration isolator that is mainly used for vibration-proof support of a power unit such as an automobile engine and other vibration generating bodies.
[0002]
[Prior art]
For example, there is a liquid-filled vibration-proof mount (100) shown in FIG. 4 as a liquid-filled vibration-proof device such as a mount that supports a vibration generator such as an automobile engine so that the vibration is not transmitted to the vehicle body. .
[0003]
This liquid-filled anti-vibration mount (100) includes an upper mounting bracket (101) and a main body bracket (102) fastened to the vibration generator side and the support side, respectively, and a thick anti-vibration base ( 103), and is connected to the vibration-proof base (103), a cylindrical upper metal fitting (104) attached to the lower part thereof by vulcanization adhesion, and a lower opening of the upper metal fitting (104). An internal space is formed between the main metal fitting (102) made of the hat-shaped lower metal fitting (105). This internal space is divided into two axial liquid chambers (108) by a partition member (108) made of a rigid material having a flange (106) extending at the peripheral portion and a recess (107) for forming an orifice on the outer periphery. 109) and (110) .These two chambers (109) and (110) are connected to the vibration isolating base (103), and are sealed rubber (vulcanized and bonded to the inner peripheral surface of the upper metal fitting (104) in the form of a thin film. 111) and the concave groove (107). Further, on the inner surface of the lower metal fitting (105), a thin rubber diaphragm (113) with a ring-shaped metal fitting (112) for reinforcement embedded in the periphery is positioned at the opening of the lower metal fitting (105). The two liquid chambers (109) and (110) filled with liquid are formed above the liquid chamber.
[0004]
As shown in FIG. 5, the connecting portion between the upper metal fitting (104) and the lower metal fitting (105) has an outer peripheral end portion extending in the radial direction, and a partition member between the extended peripheral edges. The flange (106) of (108) and the peripheral edge of the diaphragm (113) are clamped, and further, both peripheral edges of these coupling parts are folded in opposite directions and are swaged and fastened. Here, on the upper and lower surfaces of the flange (106) of the partition member (108), seal rubber (111) (114) vulcanized and bonded to the inner surface of the upper metal fitting (104) and the upper surface of the ring-shaped metal fitting (112), respectively, Seal rubber (114) vulcanized and bonded to the ring-shaped metal fitting (112) is in contact with the inner surface of the opening of the metal fitting (105), and the seal rubber (111) (114) is fixed to a predetermined dimension by the caulking. The liquid sealing performance of the liquid chambers (109) and (110) is exhibited.
[0005]
This anti-vibration mount (100) attenuates vibration against low-frequency vibrations with large amplitude generated at low speeds due to the liquid flow effect of both liquid chambers (109) and (110) by the orifice and the anti-vibration effect of the anti-vibration substrate (103). It is configured to perform a function and a vibration isolation function against high-frequency vibration generated at high speed.
[0006]
[Problems to be solved by the invention]
However, in the anti-vibration mount (100) described above, the diaphragm (113), in particular, its end attached to the body fitting (102) is in the vicinity of the seal portion that seals the liquid in the liquid chamber (109) (110). Therefore, due to the relative large displacement of the upper mounting bracket (101) and the main body bracket (102), the sealing performance deteriorates due to a sudden increase or decrease in the hydraulic pressure of the sealing liquid, or repeated repetition thereof. Air may get inside.
[0007]
In particular, in the case where the partition member (108) and the ring-shaped member (112) are caulked and fastened through the seal rubber (111) (114) as described above, the seal portion is more likely to deteriorate due to the large displacement.
[0008]
SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a liquid-filled vibration isolator that can withstand a change in the liquid pressure of a filled liquid due to a large displacement and hardly causes deterioration in sealing performance.
[0009]
[Means for Solving the Problems]
The liquid-filled vibration isolator according to claim 1 of the present invention is a diaphragm in which a main body fitting having a cylindrical body and an upper mounting fitting are coupled via a vibration isolating base made of a rubber elastic body and opposed to the vibration isolating base. Are attached to the main body fitting to form a liquid enclosure chamber that forms a part of the chamber wall, and a partition member made of a rigid material that divides the liquid enclosure chamber into two liquid chambers is disposed, and the two liquid chambers are arranged. In a liquid-filled vibration isolator that communicates with an orifice, a cylindrical rubber member having a reinforcing member made of a rigid material is fitted on the inner periphery of the main body metal fitting, and one end of the cylindrical rubber member is connected to the main body It is caulked and fastened together with the partition member at one end of the metal fitting, the diaphragm is arranged at the other end of the cylindrical rubber member, and the reinforcing member has a cylindrical shape and extends outward at the one end. A flange formed on the partition. It is caulked and fastened together with the material, and is bent and extended inward at the other end portion, and the diaphragm is continuously formed at the inner end of the bent portion, and the partition member is an inner portion of the cylindrical rubber member. It has a bottomed cylindrical shape that is fitted around the circumference, and has an axially bent end that is crimped and fastened together with a flange of the reinforcing member, and an axially other end. Is pressure-bonded to the inner peripheral surface in the vicinity of the bent portion at the other end of the cylindrical rubber member .
[0010]
According to a second aspect of the present invention, there is provided the liquid filled type vibration damping device according to the first aspect , wherein the partition member includes a concave groove for forming an orifice on an outer peripheral surface, and the upper edge portion and the lower edge portion of the concave groove are arranged in the cylinder. The orifice is formed outside the concave groove by being pressure-bonded to the inner peripheral surface of the rubber member .
[0011]
The liquid-filled vibration isolator according to claim 3 is the rigid structure according to claim 1 or 2 , wherein the caulking and fastening includes caulking the reinforcing member and the partition member of the cylindrical rubber member. The seal portion for sealing the liquid sealing chamber is made of a seal rubber disposed between the rigid members, and is close to the caulking portion by the caulking.
[0012]
According to a fourth aspect of the present invention, there is provided the liquid filled type vibration damping device according to any one of the first to third aspects , wherein the diaphragm, the partition member, and the two liquid chambers are housed in the main body metal fitting.
[0013]
The liquid-filled vibration isolator according to claim 5 is the liquid-filled vibration isolator according to any one of claims 1 to 3 , wherein the main body metal fitting is provided with a lower cylindrical body portion and an upper cylindrical shape having a diameter larger than that through a stepped portion. A cylindrical rubber member, and the upper end of the cylindrical rubber member is caulked and fastened together with the partition member at the upper end of the main body metal fitting, the diaphragm is disposed at the lower end, and the reinforcing member The bent portion is configured to be in pressure contact with the stepped portion of the main body metal fitting, and a seal rubber pressed against the stepped portion is formed on the lower surface side of the bent portion .
[0014]
[Action]
In the liquid-filled type vibration isolator according to claim 1, for example, the upper end portion of the cylindrical rubber member and the partition member are caulked and fastened to the upper end portion of the main body bracket, and the diaphragm and the partition member are connected to the upper end portion of the main body bracket. A caulking portion that bears the fixing effect and a seal portion that seals the liquid sealing chamber are disposed. On the other hand, the attachment portion of the diaphragm to the main body fitting is separated from the caulking portion and the seal portion because the diaphragm is disposed at the lower end portion of the cylindrical rubber member fitted to the inner periphery of the main body fitting. . Therefore, even if the hydraulic pressure changes due to a large displacement and the diaphragm swells and deforms, the force is blocked by the cylindrical rubber member fitted to the main body fitting and is not transmitted to the seal portion. As a result, the movement of the seal portion is restricted, and the seal performance is unlikely to deteriorate. In addition, since the partition member is fitted to the inner periphery of the cylindrical rubber member, the partition member presses the cylindrical rubber member against the inner peripheral surface of the main body fitting, and the adhesion between the cylindrical rubber member and the main body fitting is improved. Excellent.
[0015]
In the liquid filled type vibration damping device according to the second aspect, the partition member is pressure-bonded to the inner peripheral surface of the cylindrical rubber member, whereby an orifice can be formed on the outer periphery thereof.
[0016]
In the liquid-filled vibration isolator according to claim 3, the caulking portion is a rigid structure in which only the rigid material is caulked, and the seal portion is formed by arranging seal rubber between the rigid materials in the vicinity thereof. The fixing effect of each member in the caulking portion is high, and the sealing performance is also high due to the press deformation of the seal rubber by caulking.
[0017]
In the liquid-filled vibration isolator according to the fourth aspect, since the diaphragm, the partition member, and the two liquid chambers are all housed in the main body fitting, the movement of the seal portion is further restricted.
[0018]
In the liquid filled type vibration isolator according to claim 5, the sealing property between the cylindrical rubber member and the main body metal fitting is that the seal rubber disposed at the lower end of the cylindrical rubber member is pressed against the stepped portion by the caulking fastening. It is further improved by the deformation.
In the liquid-filled vibration isolator of the present invention, the upper mounting bracket extends outward over the entire circumference, and a contact portion capable of contacting the extended portion is provided as the main body bracket. So that when the vibration isolating base is greatly displaced due to vibration, the extension portion abuts against the contact portion to prevent the vibration isolating base from being displaced more than a certain amount. In this way, it is possible to reduce the change in hydraulic pressure due to the large displacement and reduce the deterioration of the sealing performance with time.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0020]
FIG. 1 shows a longitudinal sectional view of an example of a liquid-filled vibration isolator according to the present invention.
[0021]
In the figure, (1) is a bottomed body fitting having a cylindrical body, and a mounting bolt (11) projects from the bottom. (2) is an upper mounting bracket having mounting bolts (21) fixed by press-fitting or welding, and either one of the two brackets, mainly the upper mounting bracket (2) is fastened to the vibration generator side of an automobile engine or the like. Further, the main body metal fitting (1) is used by being fastened to a support side such as a chassis of the vehicle body.
[0022]
The body metal fitting (1) has a mounting portion (12) composed of a bottom portion and a cylindrical body portion extending upward from the bottom portion, and is slightly extended upward from the upper end via a step portion (13). It consists of a main body part (14) consisting of a large-diameter cylindrical body part, and both are integrally formed. The step portion (13) is located more than the bottom portion, that is, the body portion (14) is longer in the axial direction than the mounting portion (12). A flange (15) extends outward from the upper end of the main body (14) over the entire circumference.
[0023]
The upper mounting bracket (2) has a substantially frame shape as shown in the figure, and has a stopper portion (22) projecting outward over the entire circumference at the axial center portion thereof. The mounting bolt (21) is inserted from above the upper mounting bracket (2) at a predetermined acute angle with its axial direction.
[0024]
(3) is a thick anti-vibration base made of a rubber elastic body interposed between the main body metal fitting (1) and the upper mounting metal fitting (2), and has a substantially umbrella shape as shown in the figure. An upper mounting bracket (2) is embedded in the ring, and a ring-shaped auxiliary metal fitting (4) disposed in the opening at the upper end of the main body metal fitting (1) is bonded and fixed to the lower end portion. These metal fittings (2) and (4) are embedded or bonded and fixed simultaneously with the vulcanization molding of the vibration-proof base (3).
[0025]
The auxiliary metal fitting (4) is composed of an outer peripheral portion having the same outer diameter as the flange (15) of the main metal fitting (1) and an inner peripheral portion bent downward from the inner end of the outer peripheral portion and inclined. As shown in FIG. 2, a seal rubber (41) having a substantially semicircular cross section is disposed on the lower surface side of the portion.
[0026]
(5) is a coupling metal fitting having a cylindrical body, and is coupled to the flange (15) at the upper end of the main metal fitting (1) by caulking means and accommodates the vibration isolating base (3) together with the main metal fitting (1). Construct a case. An inner flange (51) for a stopper that is bent inward is provided at the upper end of the coupling fitting (5), and a large displacement upward of the main body fitting (1) due to vibration. Sometimes, the stopper portion (22) of the upper mounting bracket (2) is in contact with the inner flange (51) over the entire circumference. And the upper end part of the upper attachment metal fitting (2) has penetrated the inner side of the inner flange (51). The stopper portion (22) is encased in a rubber (31) continuous from the vibration-isolating base (3), and this rubber (31) reduces the impact when contacting the inner flange (51). doing.
[0027]
(6) is a diaphragm made of a circular rubber film disposed on the inner peripheral surface of the main body metal fitting (1), and on the substantially same plane as the step (13) of the main body metal fitting (1), It is attached to face 3). A space surrounded by the diaphragm (6), the main body (14) of the main body fitting (1), and the vibration isolating base (3) is formed as a liquid enclosure chamber (7) filled with liquid. An air chamber (71) is formed below the diaphragm (6) between the mounting portion (12) of the main body metal fitting (1), and the diaphragm (6) can be bulged and deformed. .
[0028]
The diaphragm (6) is integrally formed with a cylindrical rubber member (62) reinforced by embedding a cylindrical reinforcing bracket (61) therein, and the cylindrical rubber member (62) is formed in the main body (14). It is fitted on the circumference. The reinforcing metal fitting (61) has a flange (63) whose upper end extends outward, and this flange (63) has the same outer diameter as the flange (15) of the main metal fitting (1). Arranged on the flange (15). Further, the lower end of the reinforcing metal fitting (61) is bent inward, and the diaphragm (6) is continuously formed at the inner end of the bent portion, and the bent portion is cylindrical. The rubber member (62) is in pressure contact with the step (13) through the rubber.
[0029]
The flange (63) of the reinforcing metal fitting (61) is exposed from the rubber portion of the cylindrical rubber member (62) as shown in FIG. Further, a seal rubber (64) formed by bulging the upper end portion of the cylindrical rubber member (62) is formed on the inner surface side and the outer surface side of the bent portion at the upper end of the reinforcing metal fitting (61). Further, a seal rubber (65) pressed against the stepped portion (13) is also formed on the lower surface side of the bent portion at the lower end of the reinforcing metal fitting (61).
[0030]
(8) is a partition member made of a rigid material that divides the liquid sealing chamber (7) into two upper and lower liquid chambers (7a) and (7b) in the axial direction, and is a cylindrical rubber member (62) integral with the diaphragm (6). ). This partition member (8) is formed in a flat bottomed cylindrical shape, and its upper end is bent outward and has the same outer diameter as the flange (15) of the body fitting (1). A flange (81) is formed, and this flange (81) is arranged on the flange (63) of the reinforcing metal fitting (61). Further, a concave groove (82) for forming an orifice is formed on the outer peripheral surface of the partition member (8), and a lower end portion thereof is folded inward and upward to form a central plate-like portion. It reaches. The folded lower end and the upper edge of the groove (82) are pressure-bonded to the inner peripheral surface of the cylindrical rubber member (62), and the upper and lower liquid chambers are formed outward of the groove (82). An orifice (83) communicating with (7a) and (7b) is formed in a spiral shape. The lower end portion of the partition member (8) is in contact with the cylindrical rubber member (62) in the vicinity of the bent portion at the lower end of the reinforcing metal fitting (61).
[0031]
As shown in FIG. 2, when the main body fitting (1) and the coupling fitting (5) are joined, the reinforcing fitting (61) and the partition member (8) are placed on the flange (15) of the main body fitting (1). Each of the flanges (63) and (81) and the outer peripheral portion of the auxiliary metal fitting (4) are sequentially overlapped and caulked and fastened so that the outer ends thereof are wrapped by the lower end portion of the coupling metal fitting (5). Thereby, as shown in FIG. 3, only the rigid material is caulked in the caulking portion (16) that is caulked and fastened, and the shape retaining property can be maintained. Further, the seal rubber (41) (64) is pressed and deformed to form a seal portion (17) in the vicinity and in the vicinity of the caulking portion (16), thereby sealing between the metal fittings.
[0032]
(23) is a stopper member fixed to the upper surface of the upper mounting bracket (2) by means such as screw fastening, and is a disc-shaped metal plate having a hole through which the mounting bolt (21) passes in the center ( 24) A rubber cover (25) with an outer peripheral portion extending in a skirt shape is attached to the outer peripheral end of the lower end in the axial direction. The outer peripheral end of the metal plate (24) is in contact with the upper surface of the inner flange (51) of the coupling bracket (5) through the rubber cover (25) when placed, so that the impact at the time of contact is reduced. It has been.
[0033]
When the liquid-filled vibration isolator having the above-described configuration is in use, the internal liquid is changed to the orifice due to the deformation of the vibration-isolating base (3) and the volume change of the two liquid chambers (7a) and (7b) due to vibration of the engine or the like. The low-frequency vibration is absorbed and attenuated by the flow resistance of the vibration-proof substrate (3) and the orifice (83) and the viscosity of the liquid, and the high-frequency vibration is absorbed by the vibration-proof substrate (5) and the liquid itself. Absorbed by resonance action to reduce vibration.
[0034]
At this time, when the amount of vibration displacement of the upper mounting bracket (2) increases, for example, when the displacement is large upward, the stopper portion (22) of the upper mounting bracket (2) is connected to the inner flange (5) of the coupling bracket (5). 51) and further displacement is restricted. Further, at the time of large downward displacement, the stopper member (23) provided on the upper surface of the upper mounting bracket (2) abuts on the inner flange (51) to suppress further displacement.
[0035]
In this vibration isolator, the diaphragm (6) and the partition member (8) are caulked and fastened to the upper end of the body fitting (1) in which the mounting portion (12) and the body portion (14) are integrally formed. The seal portion (17) for sealing the liquid chambers (7a) and (7b) is brought close to the caulking portion (16), and the diaphragm (6) and the partition member (8) are placed in the body fitting (1). And the two liquid chambers (7a) and (7b) are all housed, so the seal part (17) does not move even when the hydraulic pressure changes due to a large displacement, and therefore the sealability is unlikely to be insufficient. It is possible to minimize the deterioration of performance over time.
[0036]
This is because the attachment portion of the diaphragm (6), which is likely to be loaded when the hydraulic pressure changes, to the body fitting (1) is separated from the caulking portion (16) and the seal portion (17), and the caulking portion ( This is because the portion from 16) to the mounting portion is sealed by a cylindrical rubber member (62) fitted to the inner peripheral surface of the main body fitting (1). Thereby, even if the diaphragm (6) is deformed by the fluid pressure change, and the force due to the deformation is applied to the mounting portion, the force is applied between the cylindrical rubber member (62) and the body fitting (1). Will not be transmitted to the seal (17).
[0037]
In addition, a partition member (8) is fitted to the inner periphery of the cylindrical rubber member (62) to improve the adhesion of the cylindrical rubber member (62) to the body fitting (1). The sealing property between the cylindrical rubber member (62) and the body metal fitting (1) is that the sealing rubber (65) disposed at the lower end of the cylindrical rubber member (62) is stepped (13 This is further improved by the pressure deformation to.
[0038]
Further, the caulking portion (16) is caulked only by the rigid material, and the seal portion (17) disposed in the vicinity thereof causes the seal rubber (41) (64) to be pressed and deformed between the rigid materials. Therefore, the caulking portion (16) is highly fixed and the sealing performance is also high.
[0039]
Furthermore, since the stopper portion (21) is provided on the entire circumference of the upper mounting bracket (3), even if the vibration isolating base (5) is slightly deformed or distorted in the lateral direction, the inner flange (51) Since the contact can be made in a wide range, it is possible to reliably prevent the stopper from being removed or deformed.
[0040]
【The invention's effect】
With the liquid-filled vibration isolator of the present invention, even if the hydraulic pressure changes due to a large displacement of the vibration-proof substrate, the movement of the seal portion that seals the liquid-filled chamber is restricted, so that the sealing performance is unlikely to deteriorate. . That is, it can withstand the change in the liquid pressure of the sealed liquid due to a large displacement and can minimize the deterioration of the sealing performance with time.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a liquid filled type vibration isolator according to an embodiment of the present invention.
FIG. 2 is an exploded cross-sectional view showing a main part of a caulked part in the embodiment.
FIG. 3 is an enlarged vertical sectional view showing a main part of a caulking portion in the embodiment.
FIG. 4 is a longitudinal sectional view showing an example of a conventional liquid-filled vibration isolator.
FIG. 5 is an enlarged vertical cross-sectional view of a main part of a caulking portion of a conventional liquid-filled vibration isolator.
[Explanation of symbols]
(1) …… Body bracket (2) …… Upper mounting bracket (3) …… Vibration isolation base (6) …… Diaphragm (7) …… Liquid enclosure (8) …… Partition member (16) …… Caulking Part (17) …… Seal part (22) …… Stopper part (23) …… Stopper member (41) (64) …… Seal rubber (51) …… Inner flange for stopper (61) …… Reinforcing bracket (62 ) …… Cylindrical rubber member (83) …… Orifice

Claims

A main body bracket having a cylindrical body and an upper mounting bracket are coupled via a vibration-proof base made of a rubber elastic body, and a diaphragm facing the vibration-proof base is attached to the main body bracket. In a liquid-filled vibration isolator in which a liquid sealing chamber is formed, a partition member made of a rigid material that partitions the liquid sealing chamber into two liquid chambers is disposed, and the two liquid chambers communicate with each other through an orifice.
A cylindrical rubber member having a reinforcing member made of a rigid material is fitted to the inner periphery of the main body fitting, and one end portion of the cylindrical rubber member is caulked and fastened together with the partition member at one end portion of the main body fitting, The diaphragm is disposed on the other end of the cylindrical rubber member ,
The reinforcing member has a cylindrical shape, has a flange extending outward at the one end, and the flange is caulked and fastened together with the partition member, and is bent inward at the other end. The diaphragm is continuously formed at the inner end of the bent portion,
The partition member has a bottomed cylindrical shape that is fitted to the inner periphery of the cylindrical rubber member, and is bent and extended outwardly by caulking and fastening together with a flange of the reinforcing member at one axial end portion thereof. A liquid-filled vibration isolator having an axially flanged end and an inner circumferential surface of the cylindrical rubber member near the bent portion at the other end .

The partition member is provided with a groove for forming an orifice on an outer peripheral surface, and the upper and lower edges of the groove are pressure-bonded to the inner peripheral surface of the cylindrical rubber member. The liquid-filled type vibration damping device according to claim 1 , wherein the orifice is formed on the outer side of the liquid.

The caulking fastening described above is a rigid structure that does not include an elastic body, in which the reinforcing member and the partition member of the cylindrical rubber member are caulked.
3. The liquid-sealed type according to claim 1, wherein a seal portion that seals the liquid-filled chamber is configured by a seal rubber disposed between the rigid members and is close to the caulked portion by the caulking and fastening. Anti-vibration device.

The body to fitting, said diaphragm, said partition member and hydraulic antivibration device according to any one of claims 1-3, characterized in that accommodating all of said two liquid chambers.

The main body metal fitting includes a lower cylindrical body part and an upper cylindrical body part having a diameter larger than that through a step part,
The cylindrical rubber member is caulked and fastened together with the partition member at the upper end portion of the main body metal fitting, the diaphragm is arranged at the lower end portion, and the bent portion of the reinforcing member is attached to the main body metal fitting. 4. The seal rubber according to claim 1, wherein the seal rubber is configured to be press-contacted to the stepped portion, and a seal rubber press-contacted to the stepped portion is formed on the lower surface side of the bent portion. Liquid-filled vibration isolator.