JP4188751B2 - Liquid-filled vibration isolator - Google Patents

Liquid-filled vibration isolator Download PDF

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Publication number
JP4188751B2
JP4188751B2 JP2003140984A JP2003140984A JP4188751B2 JP 4188751 B2 JP4188751 B2 JP 4188751B2 JP 2003140984 A JP2003140984 A JP 2003140984A JP 2003140984 A JP2003140984 A JP 2003140984A JP 4188751 B2 JP4188751 B2 JP 4188751B2
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Prior art keywords
wall
liquid chamber
elastic
diaphragm
partition member
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JP2004251438A (en
Inventor
英明 島津
利文 坂田
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Toyo Tire Corp
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Toyo Tire and Rubber Co Ltd
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  • Arrangement Or Mounting Of Propulsion Units For Vehicles (AREA)

Description

【0001】
【発明の属する技術分野】
本発明は、自動車エンジン等の振動体を、その振動を車体等の支持体に伝達させないように支承するために用いられる液封入式防振装置に関する。
【0002】
【従来の技術】
図5には従来の液封入式防振装置の一例が示されており、類似の構造を持つ防振装置が特開2001−50333号公報により公知となっている。
【0003】
同図に示す防振装置100は、支持体側に取り付けられる第1取付部材101と、振動体側に取り付けられる第2取付部材102とが、ゴム状弾性体からなる防振基体103を介して結合され、防振基体103に対向するダイヤフラム110を設けて第1取付部材101の内側に液室104を形成するとともに、仕切部材105を設けて該液室104を上側の主液室104Aと下側の副液室104Bとに仕切り構成してなる。
【0004】
上記仕切部材105は、リング状の補助金具106と、その中央の開口部を塞ぐゴム状弾性体からなる弾性板107とからなる。補助金具106には、その内周縁から軸方向下方に延びる縦壁部106Aが設けられ、この縦壁部106Aが弾性板107の周縁部に埋設されることで、仕切部材105の周縁部に軸方向に突出する剛性壁108が設けられている。そして、この剛性壁108をダイヤフラム110の周縁部に対し圧接することで、剛性壁108の外周には主液室104Aと副液室104Bとを連結するオリフィス流路109が形成されている。
【0005】
【特許文献1】
特開2001−50333号公報
【0006】
【発明が解決しようとする課題】
上記の構造を持つ防振装置100においては、第1取付部材101と第2取付部材102とが軸方向に大きく相対変位したときに異音が発生する場合があり、かかる異音の発生を防止することが求められている。
【0007】
本発明の目的は、液封入式防振装置において、上記のような大変位時における異音の発生を防止する点にある。
【0008】
【課題を解決するための手段】
本発明者は、上記異音の発生原因について精査していくなかで、異音は防振基体が圧縮される方向(第1取付部材と第2取付部材とが軸方向にて近づく方向)への大変位時ではなく、防振基体の引張方向(第1取付部材と第2取付部材とが軸方向にて離れる方向)への大変位時に発生することを知見した。そして、その音の性質などに鑑みて、キャビテーションが原因で異音が発生するのではないかと考えた。すなわち、防振基体の引張方向への大変位により液室内が急激に負圧になったときに、上記従来の防振装置では副液室から主液室への液体の流れはオリフィス流路を完全に通過する流れのみであるため、圧力変化を緩和しにくく、そのためキャビテーションにより気泡が発生して異音の発生につながると考えた。そして、外周にオリフィス流路を形成して内側の副液室との間を区画する壁部に、上記のような引張方向への大変位時にオリフィス流路の一部を短絡するような液の流れを生じさせる構造を設けることにより、キャビテーションを低減して異音の発生を防止できることを見い出し、本発明を完成するに至った。
【0009】
本発明に係る液封入式防振装置は、筒状部を有する第1取付部材と、該筒状部の軸心上に配された第2取付部材と、これら取付部材の間に介設されて両取付部材を結合するゴム状弾性体からなる防振基体と、該防振基体に対向して配され前記第1取付部材の内側で前記防振基体との間に液室を形成するダイヤフラムと、該液室を、前記防振基体にて室壁の一部が形成された主液室と前記ダイヤフラムにて室壁の一部が形成された副液室とに仕切る仕切部材と、を備える液封入式防振装置において、前記仕切部材と前記ダイヤフラムのいずれか一方の周縁部に軸方向に突出し周方向に延びる弾性壁を設け、その外周に前記主液室と前記副液室を連結するオリフィス流路を形成するとともに、前記仕切部材と前記ダイヤフラムの他方の周縁部に前記弾性壁の半径方向内方への変形を規制する規制部を設け、前記規制部が、前記他方の周縁部に設けられた周方向に延びる規制壁であって、前記弾性壁よりも剛性が高く設定され、かつ、該弾性壁の内周面に当接配置されて、該弾性壁の半径方向内方への変形を規制するものである。
【0010】
この液封入式防振装置では、防振基体の引張方向に所定以上の変位が付加されたときには、上記弾性壁が半径方向外方に撓み変形して隙間が形成され、副液室の液体がこの隙間からオリフィス流路内にリークする。すなわち、オリフィス流路における副液室側の正規の連通口だけでなく、オリフィス流路の途中の箇所からも弾性壁の撓み変形により副液室の液体がオリフィス流路に流れ込む。そのため、キャビテーションを低減して異音の発生を防止することができる。一方、防振基体の圧縮方向に所定以上の変位が付加されたときには、規制部により弾性壁の内方への変形を規制することができる。
【0011】
前記規制部、前記他方の周縁部に設けられた周方向に延びる規制壁であって、前記弾性壁よりも剛性が高く設定され、かつ、該弾性壁の内周面に当接配置されて、該弾性壁の半径方向内方への変形を規制するよう設けられている。
【0012】
この場合、規制壁は、弾性壁よりも半径方向、即ち防振装置の軸直角方向への撓み変形に対して高い剛性を持つものであればよく、必ずしも防振基体の大変位時において全く撓み変形しないような剛性を持つ壁である必要はない。より詳細には、規制壁は、圧縮方向の大変位時に、弾性壁の内方への撓み変形を規制し得る程度の剛性を持ち、かつ、引張方向の大変位時に、上記リークのための隙間が形成されやすいように、弾性壁と一体になって外方に撓み変形しない程度の剛性を持つことが好ましい。規制壁は、このような剛性を持つものであれば、ゴム状弾性体のみで構成することもでき、またゴム状弾性体に金属等の剛体を埋設して補強したものであってもよく、更に金属等の剛体のみで構成することもできる。
【0013】
本発明の液封入式防振装置においては、前記弾性壁が前記ダイヤフラムの周縁部に設けられ、前記規制壁が前記仕切部材の周縁部に設けられて、前記仕切部材は少なくとも前記規制壁を含むそれよりも内側の部分がゴム状弾性体のみで構成されていることが好ましい。この場合、防振基体の大変位時に、仕切部材の中央部が撓み変形することで液室内の圧力変動を軽減することができる。また、防振基体の引張方向への大変位時に、仕切部材の中央部が主液室側に撓み変形することで、これに伴って規制壁は半径方向内方に撓み変形しようとするため、半径方向外方に撓み変形する弾性壁との間で上記リークのための隙間をより大きく確保しやすい。また、防振基体の圧縮方向への大変位時には、仕切部材の中央部が副液室側に撓み変形することで、これに伴って規制壁は半径方向外方に撓み変形しようとするため、外周の弾性壁との密接度を高めることができる。
【0014】
【発明の実施の形態】
以下、本発明の1実施形態に係る液封入式防振装置10について図面を参照して説明する。
【0015】
この防振装置10は、自動車のエンジンを車体に対して支承するエンジンマウントであり、筒状部11を有し車体側のブラケット1に取付固定される下側の金属製第1取付部材12と、その軸心上において上方に間隔をおいて配されエンジン側のブラケット2に取付固定される上側の金属製第2取付部材14とを、ゴム状弾性体よりなる防振基体16を介して結合してなり、上下方向、即ち第1取付部材12の軸方向に振動が付加されるものである。
【0016】
防振基体16は、外形が略截頭円錐形をなし、その上部軸心上に第2取付部材14の下部が加硫成形手段により埋設されており、防振基体16の下端外周部は第1取付部材12の上部内周面に加硫成形手段により接着固定されている。
【0017】
第1取付部材12の下部側には、防振基体16と対向するようにダイヤフラム18が装着されている。ダイヤフラム18は、可撓性膜としての薄肉ゴム膜20と、その外周部に加硫接着された筒状の補助金具22とからなり、補助金具22の上端外周縁が第1取付部材12の下端12Aによりかしめ固定されている。
【0018】
第1取付部材12の内側には、ダイヤフラム18と防振基体16との間に密閉された液室24が形成されており、この液室24に液体が封入されている。液室24内には、外周にオリフィス流路26を形成する円盤状の仕切部材28が設けられており、液室24はこの仕切部材28により上下に仕切られている。すなわち、第1取付部材12の内側における防振基体16とダイヤフラム18との間には、防振基体16にて室壁の一部が形成された主液室24Aと、主液室24Aにオリフィス流路26を介して連結されるとともにダイヤフラム18にて室壁の一部が形成された副液室24Bとが、仕切部材28を介して互いに上下に隣接して設けられている。
【0019】
仕切部材28は、ゴム状弾性体からなる円盤状の弾性板部32と、その周縁部に一体に加硫接着されたリング状の補助金具30とからなり、オリフィス流路26が閉塞した状態となるような高周波数域の振動が付加されたときに、弾性板部32によって防振性能を発揮できるように構成されている。補助金具30の外周縁は、第1取付部材12の下端12Aによってダイヤフラム18の補助金具22とともにかしめ固定されており、これにより仕切部材28は液室24内に固定されている。
【0020】
ダイヤフラム18の補助金具22は、軸方向下方ほど小径化されたテーパ筒状をなしており、その内側に上記オリフィス流路26が形成されている。また、ダイヤフラム18の周縁部には、軸方向上方の主液室24A側に向かって突出して周方向に延びる弾性壁34が薄肉ゴム膜20と一体のゴム状弾性体により形成されている。そして、この弾性壁34を仕切部材28の周縁部に当接させることにより、弾性壁34の外周において補助金具22との間でオリフィス流路26が形成され、従って、オリフィス流路26は弾性壁34によって副液室24Bの外周に仕切り構成されている。弾性壁34は、オリフィス流路26内にある一定以上の負圧が生じたときに半径方向外方に撓み変形できるように、ゴムや熱可塑性エラストマー等の弾性材料のみで形成されている。
【0021】
一方、仕切部材28の周縁部には、軸方向下方の副液室24B側に突出して周方向に延びる規制壁36が弾性板部32と一体のゴム状弾性体により形成されている。この規制壁36は、弾性壁34の内側に嵌着されており、これにより弾性壁34は半径方向外方には撓み変形可能であるものの、半径方向内方には規制壁36により撓み変形が規制・阻止されている。
【0022】
詳細には、規制壁36は、弾性壁34よりも剛性が高くなるように肉厚に形成されている。また、仕切部材28の周縁部には、規制壁36の外周側に軸方向上方に落ち込んだ水平な段部38が設けられており、この段部38に対し弾性壁34の先端面を当接させることで、オリフィス流路26の内周側の壁部が規制壁36と弾性壁34とによる内外二重に形成されている。
【0023】
なお、弾性壁34の内周面には周方向に延びる凸条40が設けられ、またこれに対向する規制壁36の外周面には周方向に延びる凹溝42が設けられて、両者が嵌合するように組付けられている。これに代えて、弾性壁34に凹溝を、規制壁36に凸条を設けてもよい。
【0024】
図1及び図4(c)に示すように、仕切部材28には周上の一箇所において半径方向外方に突出してオリフィス流路26を遮断する遮断部44が設けられており、遮断部44を挟んだ周方向の両側において、オリフィス流路26を主液室24A側に連通する第1連通口46と、オリフィス流路26を副液室24B側に連通する第2連通口48とが形成されている。これにより、オリフィス流路26は周方向で略一周の長さをもって主液室24Aと副液室24Bを相互に連通する。
【0025】
第1連通口46は、補助金具30に上下に貫通する開孔を設けることで形成されており、第2連通口48は、上記規制壁36を周方向の一部で切り欠くことにより形成されている。なお、補助金具30の内周縁には、遮断部44から第1連通口46の配設位置にかけて軸方向下方に突出する補強壁部50が設けられ、これによりオリフィス流路26の内周側を補強して副液室24Bとの間の不所望な短絡を防止している。
【0026】
以上よりなる本実施形態の液封入式防振装置10では、図2に示すように、小変位時(即ち、所定振幅以下の軸方向振動が入力されたとき。例えば±0.5mm)には、主液室24Aと副液室24Bとの間でオリフィス流路26を通って液体の流動が生じ、その流動効果により振動減衰機能を発揮することができる。なお、弾性壁34の弾性率、規制壁36との嵌合度合などは、このような小変位時では弾性壁34が撓み変形しないように設定されている。
【0027】
一方、大変位時、例えば±6.0mmの軸方向振動が入力されたときには、次のようになる。まず、防振基体16の圧縮方向における大変位時(即ち、第1取付部材12と第2取付部材14とが近づく方向に所定以上の変位が付加されたとき)には、規制壁36により弾性壁34の内側への撓み変形が阻止されているので、小変位時と同様、図2に示すようにオリフィス流路26のみを通して主液室24Aから副液室24Bに液体を流すことができ、オリフィス流路26の液流動効果を発揮させることができる。なお、規制壁36は、このような大変位時においてまで、弾性壁34の内側への撓み変形を必ずしも完全に阻止するものである必要はない。オリフィス流路26はそもそも上記のような小変位時における振動減衰を対象としており、大変位時には必ずしも十分な液流動効果は得られないからである。
【0028】
そして、防振基体16の引張方向における大変位時(即ち、第1取付部材12と第2取付部材14とが離れる方向に所定以上の変位が付加されたとき)には、図3に示すように、弾性壁34は、その外周に規制壁がないので、オリフィス流路26内が負圧になることで自身の弾性により半径方向外方に撓み変形する。これにより、副液室24Bの液体が連通口48からだけでなく、矢印Xで示すように撓み変形した箇所からもリークしてオリフィス流路26に流れ込む。そのため、液室24内における圧力変化を緩和してキャビテーションを低減することができ、もって異音の発生を防止することができる。弾性壁34の撓み変形は液圧変化に伴う一時的なものであり、上記負圧が解消されれば図1に示す元の状態に戻る。
【0029】
本実施形態では、特に、仕切部材28を、周縁部のリング状の補助金具30と、その開口部を塞ぐ円盤状の弾性板部32とで構成し、規制壁36を含むそれよりも内側の部分をゴム状弾性体のみで構成したので、大変位時に、弾性板部32が撓み変形することで、液室24内の圧力変動を軽減することができるとともに、以下の作用効果が得られる。
【0030】
すなわち、防振基体16の引張方向への大変位時には、主液室24A内が負圧になることで、仕切部材28の中央部の弾性板部32が上方、即ち主液室24A側に引っ張られ、それに伴って規制壁36は、半径方向内方(図3において矢印Yで示す方向)に撓み変形しようとする。そのため、半径方向外方に撓み変形する弾性壁34との間で上記リークのための隙間をより大きく確保しやすくなる。また、防振基体16の圧縮方向への大変位時には、主液室24A内が加圧されることで、弾性板部32が副液室24B側に押され、それに伴って規制壁36は、半径方向外方(図2において矢印Zで示す方向)に撓み変形しようし、これにより、外周の弾性壁34との密接度を高めることができる。
【0031】
なお、以上の実施形態においては、ダイヤフラム18に弾性壁34を設け、仕切部材28にこれの内方への変形を規制する規制壁36を設けているが、両者を逆に、即ち仕切部材の周縁部に弾性壁を設け、ダイヤフラムの周縁部に該弾性壁の内方への変形を規制する規制壁を設けることもできる。その場合、仕切部材の弾性壁をダイヤフラムの周縁部に当接してその外周にオリフィス流路を形成すればよい。
【0032】
【発明の効果】
本発明によれば、防振基体の小変位時や圧縮方向への大変位時には正規のオリフィス流路の流れを確保しつつ、異音が生じる引張方向への大変位時には副液室の液体をオリフィス流路の一部を短絡するようにオリフィス流路内にリークさせ、これによりキャビテーションを低減して異音の発生を防止することができる。
【図面の簡単な説明】
【図1】 本発明の1実施形態に係る液封入式防振装置の縦断面図(図4(c)のI−I線断面図)である。
【図2】 防振基体の小変位時及び圧縮方向への大変位時における防振装置の断面図(図4(c)のII−II線断面に相当する図)である。
【図3】 防振基体の引張方向への大変位時における防振装置の断面図である。
【図4】 (a)は仕切部材の上面図、(b)は仕切部材の断面図、(c)は仕切部材の底面図である。
【図5】 従来の液封入式防振装置の縦断面図である。
【符号の説明】
11……筒状部
12……第1取付部材
14……第2取付部材
16……防振基体
18……ダイヤフラム
24……液室
24A……主液室
24B……副液室
26……オリフィス流路
28……仕切部材
34……弾性壁
36……規制壁
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a liquid-filled vibration isolator used to support a vibrating body such as an automobile engine so that the vibration is not transmitted to a support body such as a vehicle body.
[0002]
[Prior art]
FIG. 5 shows an example of a conventional liquid-filled vibration isolator, and a vibration isolator having a similar structure is disclosed in Japanese Patent Laid-Open No. 2001-50333.
[0003]
In the vibration isolator 100 shown in the figure, a first attachment member 101 attached to the support side and a second attachment member 102 attached to the vibration body side are coupled via a vibration isolation base 103 made of a rubber-like elastic body. In addition, a diaphragm 110 facing the vibration isolating base 103 is provided to form a liquid chamber 104 inside the first mounting member 101, and a partition member 105 is provided to connect the liquid chamber 104 to the upper main liquid chamber 104A and the lower main liquid chamber 104A. The auxiliary liquid chamber 104B is configured to be partitioned.
[0004]
The partition member 105 includes a ring-shaped auxiliary metal fitting 106 and an elastic plate 107 made of a rubber-like elastic body that closes the central opening. The auxiliary metal fitting 106 is provided with a vertical wall portion 106 </ b> A that extends downward in the axial direction from the inner peripheral edge thereof, and the vertical wall portion 106 </ b> A is embedded in the peripheral edge portion of the elastic plate 107, thereby A rigid wall 108 protruding in the direction is provided. Then, by pressing the rigid wall 108 against the peripheral edge of the diaphragm 110, an orifice channel 109 that connects the main liquid chamber 104A and the sub liquid chamber 104B is formed on the outer periphery of the rigid wall 108.
[0005]
[Patent Document 1]
Japanese Patent Laid-Open No. 2001-50333
[Problems to be solved by the invention]
In the vibration isolator 100 having the above structure, abnormal noise may occur when the first mounting member 101 and the second mounting member 102 are relatively displaced in the axial direction, and the generation of such abnormal noise is prevented. It is requested to do.
[0007]
An object of the present invention is to prevent the generation of abnormal noise during a large displacement as described above in a liquid-filled vibration isolator.
[0008]
[Means for Solving the Problems]
As the inventor scrutinizes the cause of the abnormal noise, the abnormal noise is in a direction in which the vibration-proof base is compressed (a direction in which the first mounting member and the second mounting member approach in the axial direction). It has been found that this occurs not in the case of a large displacement in the case of large displacement in the tension direction of the vibration-proof base (the direction in which the first mounting member and the second mounting member are separated in the axial direction). Then, in view of the nature of the sound, etc., I thought that abnormal noise might occur due to cavitation. That is, when the liquid chamber suddenly becomes negative pressure due to the large displacement of the vibration isolating substrate in the pulling direction, the liquid flow from the sub liquid chamber to the main liquid chamber is caused to flow through the orifice channel in the conventional vibration isolator. It was thought that it was difficult to alleviate the pressure change because it was a completely passing flow, so that bubbles were generated by cavitation, leading to abnormal noise. Then, on the wall that forms the orifice channel on the outer periphery and divides it from the inner sub-liquid chamber, the liquid that short-circuits a part of the orifice channel at the time of large displacement in the tensile direction as described above. It has been found that by providing a structure for generating a flow, cavitation can be reduced and generation of abnormal noise can be prevented, and the present invention has been completed.
[0009]
A liquid-filled vibration isolator according to the present invention is interposed between a first mounting member having a cylindrical portion, a second mounting member disposed on the axial center of the cylindrical portion, and the mounting members. And a diaphragm for forming a liquid chamber between the anti-vibration base and the anti-vibration base disposed between the anti-vibration base and the anti-vibration base. And a partition member that divides the liquid chamber into a main liquid chamber in which a part of the chamber wall is formed by the vibration isolating base and a sub liquid chamber in which a part of the chamber wall is formed by the diaphragm. In the liquid-filled vibration isolator, an elastic wall that protrudes in the axial direction and extends in the circumferential direction is provided on the peripheral edge of one of the partition member and the diaphragm, and the main liquid chamber and the sub liquid chamber are connected to the outer periphery thereof. Forming an orifice flow path, and in front of the other peripheral portion of the partition member and the diaphragm. The regulating portion for regulating a deformation in the radially inward elastic wall provided, wherein the regulating portion, a restricting wall extending in circumferential direction provided on the periphery of the other, higher rigidity than the elastic wall The elastic wall is set and abutted on the inner peripheral surface of the elastic wall to restrict the deformation of the elastic wall inward in the radial direction .
[0010]
In this liquid-filled vibration isolator, when a predetermined displacement or more is applied in the tension direction of the vibration isolator base, the elastic wall is bent outwardly in the radial direction to form a gap, and the liquid in the sub liquid chamber is Leakage into the orifice channel from this gap. That is, the liquid in the sub liquid chamber flows into the orifice flow channel not only from the normal communication port on the sub liquid chamber side in the orifice flow channel but also from the midway of the orifice flow channel due to the bending deformation of the elastic wall. Therefore, it is possible to reduce cavitation and prevent the generation of abnormal noise. On the other hand, when a predetermined displacement or more is applied in the compression direction of the vibration isolating base, the inward deformation of the elastic wall can be restricted by the restricting portion.
[0011]
The restricting portion is a restricting wall provided in the other peripheral portion and extending in the circumferential direction. The restricting portion is set to be higher in rigidity than the elastic wall and is disposed in contact with the inner peripheral surface of the elastic wall. The elastic wall is provided to restrict deformation inward in the radial direction .
[0012]
In this case, the restricting wall only needs to have higher rigidity than the elastic wall against bending deformation in the radial direction, that is, in the direction perpendicular to the axis of the vibration isolator. The wall need not be rigid enough not to deform. More specifically, the restriction wall has a rigidity that can restrict the inward deformation of the elastic wall when the displacement in the compression direction is large, and the gap for the leak is large when the displacement in the tension direction is large. It is preferable to have rigidity that is integral with the elastic wall so as not to bend outward and be deformed. As long as the regulating wall has such rigidity, it can be composed only of a rubber-like elastic body, or may be a rubber-like elastic body reinforced by embedding a rigid body such as metal, Furthermore, it can also be comprised only with rigid bodies, such as a metal.
[0013]
In the liquid filled type vibration damping device of the present invention, the elastic wall is provided at a peripheral portion of the diaphragm, the restriction wall is provided at a peripheral portion of the partition member, and the partition member includes at least the restriction wall. It is preferable that the inner part is composed only of a rubber-like elastic body. In this case, the pressure fluctuation in the liquid chamber can be reduced by bending and deforming the central portion of the partition member when the vibration isolating base body is largely displaced. In addition, when the displacement of the vibration isolating base is large in the pulling direction, the central portion of the partition member is bent and deformed toward the main liquid chamber, and accordingly, the restriction wall tends to bend and deform radially inward. It is easy to secure a larger gap for the leak between the elastic wall and the elastic wall that is bent outward in the radial direction. Further, at the time of large displacement in the compression direction of the vibration-proof substrate, the central portion of the partition member is bent and deformed toward the sub liquid chamber side, and accordingly, the restriction wall is bent and deformed radially outward. The closeness with the outer peripheral elastic wall can be increased.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a liquid-filled vibration isolator 10 according to an embodiment of the present invention will be described with reference to the drawings.
[0015]
The vibration isolator 10 is an engine mount that supports an automobile engine with respect to a vehicle body, and includes a lower metal first attachment member 12 that has a cylindrical portion 11 and is fixedly attached to a bracket 1 on the vehicle body side. The upper metal second mounting member 14 which is disposed on the shaft center with an interval therebetween and fixed to the engine-side bracket 2 is coupled via a vibration-isolating base 16 made of a rubber-like elastic body. Thus, vibration is applied in the vertical direction, that is, in the axial direction of the first mounting member 12.
[0016]
The anti-vibration base 16 has a substantially frustoconical outer shape, and the lower portion of the second mounting member 14 is embedded on the upper axis thereof by vulcanization molding means. 1 Attached to the upper inner peripheral surface of the mounting member 12 by vulcanization molding means.
[0017]
A diaphragm 18 is mounted on the lower side of the first mounting member 12 so as to face the vibration isolation base 16. The diaphragm 18 includes a thin rubber film 20 as a flexible film and a cylindrical auxiliary metal fitting 22 vulcanized and bonded to the outer periphery thereof, and the upper outer periphery of the auxiliary metal fitting 22 is the lower end of the first mounting member 12. It is fixed by caulking with 12A.
[0018]
A liquid chamber 24 sealed between the diaphragm 18 and the vibration isolation base 16 is formed inside the first mounting member 12, and the liquid is sealed in the liquid chamber 24. In the liquid chamber 24, a disk-shaped partition member 28 that forms an orifice channel 26 is provided on the outer periphery, and the liquid chamber 24 is partitioned vertically by the partition member 28. That is, between the vibration isolating substrate 16 and the diaphragm 18 inside the first mounting member 12, a main liquid chamber 24A in which a part of the chamber wall is formed by the vibration isolating substrate 16, and an orifice in the main liquid chamber 24A. A sub-liquid chamber 24 </ b> B that is connected via the flow path 26 and in which a part of the chamber wall is formed by the diaphragm 18 is provided adjacent to each other via the partition member 28.
[0019]
The partition member 28 includes a disk-shaped elastic plate portion 32 made of a rubber-like elastic body and a ring-shaped auxiliary metal fitting 30 integrally vulcanized and bonded to the peripheral portion thereof, and the orifice channel 26 is closed. When vibration in such a high frequency range is applied, the elastic plate portion 32 is configured to exhibit vibration proof performance. The outer peripheral edge of the auxiliary metal fitting 30 is caulked and fixed together with the auxiliary metal fitting 22 of the diaphragm 18 by the lower end 12 </ b> A of the first mounting member 12, whereby the partition member 28 is fixed in the liquid chamber 24.
[0020]
The auxiliary metal fitting 22 of the diaphragm 18 has a tapered cylindrical shape whose diameter is reduced toward the lower side in the axial direction, and the orifice channel 26 is formed inside thereof. In addition, an elastic wall 34 that protrudes toward the main liquid chamber 24 </ b> A on the upper side in the axial direction and extends in the circumferential direction is formed of a rubber-like elastic body integrated with the thin rubber film 20 at the peripheral edge of the diaphragm 18. Then, by bringing the elastic wall 34 into contact with the peripheral edge of the partition member 28, an orifice channel 26 is formed between the outer periphery of the elastic wall 34 and the auxiliary metal fitting 22. A partition 34 is formed on the outer periphery of the auxiliary liquid chamber 24B. The elastic wall 34 is formed of only an elastic material such as rubber or a thermoplastic elastomer so that it can bend and deform radially outward when a certain negative pressure or more is generated in the orifice channel 26.
[0021]
On the other hand, on the peripheral edge of the partition member 28, a regulating wall 36 that protrudes in the axially lower sub liquid chamber 24 </ b> B side and extends in the circumferential direction is formed of a rubber-like elastic body that is integral with the elastic plate portion 32. The restricting wall 36 is fitted inside the elastic wall 34, whereby the elastic wall 34 can be bent and deformed radially outward, but is deformed and deformed by the restricting wall 36 radially inward. Regulated and blocked.
[0022]
Specifically, the regulation wall 36 is formed thick so that the rigidity is higher than that of the elastic wall 34. In addition, a horizontal stepped portion 38 is provided on the outer peripheral side of the regulating wall 36 at the peripheral portion of the partition member 28, and the tip end surface of the elastic wall 34 is brought into contact with the stepped portion 38. By doing so, the wall portion on the inner peripheral side of the orifice channel 26 is formed in an inner-outer double by the regulating wall 36 and the elastic wall 34.
[0023]
The elastic wall 34 is provided with a ridge 40 extending in the circumferential direction on the inner peripheral surface thereof, and a concave groove 42 extending in the circumferential direction is provided on the outer peripheral surface of the regulating wall 36 opposed thereto. It is assembled to match. Instead of this, the elastic wall 34 may be provided with a concave groove, and the regulating wall 36 may be provided with a ridge.
[0024]
As shown in FIGS. 1 and 4C, the partition member 28 is provided with a blocking portion 44 that protrudes radially outward at one location on the circumference and blocks the orifice channel 26. A first communication port 46 that communicates the orifice channel 26 to the main liquid chamber 24A side and a second communication port 48 that communicates the orifice channel 26 to the sub-liquid chamber 24B side are formed on both sides in the circumferential direction across the gap. Has been. As a result, the orifice passage 26 communicates the main liquid chamber 24A and the sub liquid chamber 24B with each other with a length of substantially one round in the circumferential direction.
[0025]
The first communication port 46 is formed by providing an opening extending vertically through the auxiliary metal fitting 30, and the second communication port 48 is formed by cutting out the restriction wall 36 at a part in the circumferential direction. ing. A reinforcing wall portion 50 is provided on the inner peripheral edge of the auxiliary metal fitting 30 so as to protrude downward in the axial direction from the blocking portion 44 to the position where the first communication port 46 is disposed. Reinforcing prevents undesired short circuit with the auxiliary liquid chamber 24B.
[0026]
In the liquid filled type vibration damping device 10 of the present embodiment configured as described above, as shown in FIG. 2, at the time of small displacement (that is, when axial vibration with a predetermined amplitude or less is input, for example, ± 0.5 mm). The liquid flow occurs through the orifice channel 26 between the main liquid chamber 24A and the sub liquid chamber 24B, and the vibration damping function can be exhibited by the flow effect. Note that the elastic modulus of the elastic wall 34, the degree of fitting with the regulating wall 36, and the like are set so that the elastic wall 34 does not bend and deform during such a small displacement.
[0027]
On the other hand, when a large displacement, for example, ± 6.0 mm of axial vibration is input, the following occurs. First, when the vibration isolator base 16 is largely displaced in the compression direction (that is, when a displacement of a predetermined amount or more is applied in the direction in which the first mounting member 12 and the second mounting member 14 approach each other), the regulation wall 36 is elastic. Since the bending deformation to the inside of the wall 34 is prevented, the liquid can flow from the main liquid chamber 24A to the sub liquid chamber 24B only through the orifice channel 26 as shown in FIG. The liquid flow effect of the orifice channel 26 can be exhibited. It should be noted that the restriction wall 36 does not necessarily need to completely prevent the inward deformation of the elastic wall 34 until such a large displacement. This is because the orifice channel 26 is originally intended for vibration damping at the time of a small displacement as described above, and a sufficient liquid flow effect cannot always be obtained at the time of a large displacement.
[0028]
Then, when the vibration isolating base 16 is displaced greatly in the pulling direction (that is, when a predetermined displacement or more is applied in the direction in which the first mounting member 12 and the second mounting member 14 are separated), as shown in FIG. In addition, since the elastic wall 34 has no restriction wall on the outer periphery thereof, the inside of the orifice channel 26 becomes a negative pressure, and is bent and deformed outward in the radial direction by its own elasticity. As a result, the liquid in the auxiliary liquid chamber 24B leaks not only from the communication port 48 but also from the position where it is bent and deformed as indicated by the arrow X, and flows into the orifice channel 26. Therefore, the pressure change in the liquid chamber 24 can be relieved and cavitation can be reduced, thereby preventing the generation of abnormal noise. The bending deformation of the elastic wall 34 is temporary accompanying the change in hydraulic pressure, and when the negative pressure is eliminated, the original state shown in FIG. 1 is restored.
[0029]
In the present embodiment, in particular, the partition member 28 is constituted by a ring-shaped auxiliary metal fitting 30 at the peripheral edge and a disk-shaped elastic plate portion 32 that closes the opening, and includes a regulating wall 36 and the inside thereof. Since the portion is composed only of the rubber-like elastic body, the elastic plate portion 32 bends and deforms at the time of large displacement, so that the pressure fluctuation in the liquid chamber 24 can be reduced and the following effects can be obtained.
[0030]
That is, when the vibration isolator base 16 is displaced greatly in the pulling direction, the inside of the main liquid chamber 24A becomes negative pressure, so that the elastic plate 32 at the center of the partition member 28 is pulled upward, that is, toward the main liquid chamber 24A. Accordingly, the restriction wall 36 tends to bend and deform radially inward (in the direction indicated by the arrow Y in FIG. 3). Therefore, it becomes easier to secure a larger gap for the leak between the elastic wall 34 that is bent outward in the radial direction. Further, when the vibration isolator base 16 is displaced in the compression direction, the inside of the main liquid chamber 24A is pressurized, so that the elastic plate portion 32 is pushed to the sub liquid chamber 24B side. It is likely to bend and deform radially outward (in the direction indicated by arrow Z in FIG. 2), thereby increasing the closeness with the outer peripheral elastic wall 34.
[0031]
In the above embodiment, the diaphragm 18 is provided with the elastic wall 34, and the partition member 28 is provided with the restriction wall 36 that restricts the inward deformation thereof. An elastic wall may be provided at the peripheral edge, and a restriction wall for restricting the inward deformation of the elastic wall may be provided at the peripheral edge of the diaphragm. In that case, the elastic wall of the partition member may be brought into contact with the peripheral edge of the diaphragm and the orifice channel may be formed on the outer periphery thereof.
[0032]
【The invention's effect】
According to the present invention, the flow of the normal orifice channel is ensured when the vibration-proof base is small or large in the compression direction, and the liquid in the sub liquid chamber is discharged when large in the tensile direction in which abnormal noise is generated. It is possible to leak into the orifice flow path so as to short-circuit a part of the orifice flow path, thereby reducing cavitation and preventing abnormal noise.
[Brief description of the drawings]
FIG. 1 is a vertical cross-sectional view (cross-sectional view taken along the line II in FIG. 4C) of a liquid-filled vibration isolator according to one embodiment of the present invention.
FIG. 2 is a cross-sectional view of the vibration isolator when the vibration isolator base body is small displaced and a large displacement in the compression direction (a diagram corresponding to a cross section taken along line II-II in FIG. 4C).
FIG. 3 is a cross-sectional view of the vibration isolator when the vibration isolator base is largely displaced in the tensile direction.
4A is a top view of a partition member, FIG. 4B is a cross-sectional view of the partition member, and FIG. 4C is a bottom view of the partition member.
FIG. 5 is a longitudinal sectional view of a conventional liquid-filled vibration isolator.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 ... Cylindrical part 12 ... 1st attachment member 14 ... 2nd attachment member 16 ... Vibration-proof base 18 ... Diaphragm 24 ... Liquid chamber 24A ... Main liquid chamber 24B ... Sub-liquid chamber 26 ... Orifice channel 28 ... partition member 34 ... elastic wall 36 ... regulating wall

Claims (2)

筒状部を有する第1取付部材と、該筒状部の軸心上に配された第2取付部材と、これら取付部材の間に介設されて両取付部材を結合するゴム状弾性体からなる防振基体と、該防振基体に対向して配され前記第1取付部材の内側で前記防振基体との間に液室を形成するダイヤフラムと、該液室を、前記防振基体にて室壁の一部が形成された主液室と前記ダイヤフラムにて室壁の一部が形成された副液室とに仕切る仕切部材と、を備える液封入式防振装置において、
前記仕切部材と前記ダイヤフラムのいずれか一方の周縁部に軸方向に突出し周方向に延びる弾性壁を設け、その外周に前記主液室と前記副液室を連結するオリフィス流路を形成するとともに、前記仕切部材と前記ダイヤフラムの他方の周縁部に前記弾性壁の半径方向内方への変形を規制する規制部を設け
前記規制部は、前記他方の周縁部に設けられた周方向に延びる規制壁であって、前記弾性壁よりも剛性が高く設定され、かつ、該弾性壁の内周面に当接配置されて、該弾性壁の半径方向内方への変形を規制する
ことを特徴とする液封入式防振装置。
A first mounting member having a cylindrical portion, a second mounting member disposed on the axial center of the cylindrical portion, and a rubber-like elastic body interposed between the mounting members and connecting the two mounting members. An anti-vibration base, a diaphragm which is disposed opposite to the anti-vibration base and forms a liquid chamber between the anti-vibration base and the anti-vibration base inside the first mounting member, and the liquid chamber is attached to the anti-vibration base. In a liquid-filled vibration isolator comprising: a main liquid chamber in which a part of the chamber wall is formed; and a partition member that partitions the sub-liquid chamber in which a part of the chamber wall is formed by the diaphragm;
An elastic wall that protrudes in the axial direction and extends in the circumferential direction is provided on the peripheral edge of one of the partition member and the diaphragm, and an orifice channel that connects the main liquid chamber and the sub liquid chamber is formed on the outer periphery thereof. A restricting portion for restricting deformation of the elastic wall inward in the radial direction is provided on the other peripheral portion of the partition member and the diaphragm ,
The restricting portion is a restricting wall provided in the other peripheral portion and extending in the circumferential direction. The restricting portion is set to be higher in rigidity than the elastic wall and is disposed in contact with the inner peripheral surface of the elastic wall. , hydraulic antivibration apparatus characterized by regulating the deformation of the radially inwardly of the elastic wall.
前記弾性壁が前記ダイヤフラムの周縁部に設けられ、前記規制壁が前記仕切部材の周縁部に設けられて、前記仕切部材は少なくとも前記規制壁を含むそれよりも内側の部分がゴム状弾性体のみで構成されたことを特徴とする請求項記載の液封入式防振装置。The elastic wall is provided at a peripheral edge of the diaphragm, the restriction wall is provided at a peripheral edge of the partition member, and the partition member includes at least the restriction wall and a portion inside the rubber member is only a rubber-like elastic body. in fact it constructed hydraulic antivibration device according to claim 1, wherein.
JP2003140984A 2002-12-25 2003-05-19 Liquid-filled vibration isolator Expired - Fee Related JP4188751B2 (en)

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