JP4077007B2 - Liquid filled vibration isolator and liquid filled vibration isolator unit - Google Patents

Liquid filled vibration isolator and liquid filled vibration isolator unit Download PDF

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JP4077007B2
JP4077007B2 JP2005512257A JP2005512257A JP4077007B2 JP 4077007 B2 JP4077007 B2 JP 4077007B2 JP 2005512257 A JP2005512257 A JP 2005512257A JP 2005512257 A JP2005512257 A JP 2005512257A JP 4077007 B2 JP4077007 B2 JP 4077007B2
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liquid
vibration
rubber
vibration isolator
partition
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JPWO2006054336A1 (en
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晋吾 畠山
彦文 山本
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Toyo Tire Corp
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Toyo Tire and Rubber Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F13/00—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs
    • F16F13/04—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a plastics spring and a damper, e.g. a friction damper
    • F16F13/06—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a plastics spring and a damper, e.g. a friction damper the damper being a fluid damper, e.g. the plastics spring not forming a part of the wall of the fluid chamber of the damper
    • F16F13/08—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a plastics spring and a damper, e.g. a friction damper the damper being a fluid damper, e.g. the plastics spring not forming a part of the wall of the fluid chamber of the damper the plastics spring forming at least a part of the wall of the fluid chamber of the damper
    • F16F13/10—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a plastics spring and a damper, e.g. a friction damper the damper being a fluid damper, e.g. the plastics spring not forming a part of the wall of the fluid chamber of the damper the plastics spring forming at least a part of the wall of the fluid chamber of the damper the wall being at least in part formed by a flexible membrane or the like
    • F16F13/105—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a plastics spring and a damper, e.g. a friction damper the damper being a fluid damper, e.g. the plastics spring not forming a part of the wall of the fluid chamber of the damper the plastics spring forming at least a part of the wall of the fluid chamber of the damper the wall being at least in part formed by a flexible membrane or the like characterised by features of partitions between two working chambers
    • F16F13/106—Design of constituent elastomeric parts, e.g. decoupling valve elements, or of immediate abutments therefor, e.g. cages
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K5/00—Arrangement or mounting of internal-combustion or jet-propulsion units
    • B60K5/12—Arrangement of engine supports
    • B60K5/1208—Resilient supports

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Combined Devices Of Dampers And Springs (AREA)
  • Arrangement Or Mounting Of Propulsion Units For Vehicles (AREA)

Description

【技術分野】
本発明は、液封入式防振装置及び液封入式防振装置ユニットに関し、特に、比較的小振幅の振動入力時の低動ばね特性と、比較的大振幅入力時の高減衰特性とを確保しつつ、異音の発生を十分に低減することができる液封入式防振装置及び液封入式防振装置ユニットに関するものである。
【背景技術】
自動車のエンジンやトランスミッションなどの振動発生体を支持固定しつつ、その振動を車体フレームへ伝達させないようにする防振装置として、液封入式防振装置が知られている。
この液封入式防振装置は、一般に、エンジン側に取り付けられる第１取付け具と、車体フレーム側に取り付けられる第２取付け具とが、ゴム状弾性体から構成される防振基体で連結される。そして、第２取付け具に取付けられたダイヤフラムにより、そのダイヤフラムと防振基体との間に液封入室が形成される。
液封入室は、仕切り手段によって第１液室および第２液室の２室に仕切られ、これら第１及び第２液室は、オリフィスによって互いに連通される。この液封入式防振装置によれば、オリフィスによる第１及び第２液室間の流体流動効果や防振基体の制振効果により、振動減衰機能と振動絶縁機能とを果す。
ここで、仕切り手段が、弾性仕切り膜と、その弾性仕切り膜の変位量をその両側から規制する一対の変位規制部材とを備えて構成されている液封入式防振装置がある。
この種の液封入式防振装置によれば、比較的小振幅の振動が入力される場合には、弾性仕切り膜が往復動変位することで、両液室間の液圧変動を吸収して、低動ばね特性を得ることができる。一方、例えば、走行路面の凹凸などに起因して、比較的大振幅の振動が入力される場合には、弾性仕切り膜の変位量を変位規制部材で両側から規制して膜剛性を高めることで、流体がオリフィスを介して両液室間で流動し易くして、高減衰特性を得ることができる。
しかしながら、この種の液封入式防振装置では、弾性仕切り膜を変位規制部材に衝突（当接）させる構造であるため、その衝突の際に変位規制部材が振動し、その振動が車体フレームへ伝達されることで、異音が発生するという問題点があった。
この問題点に対しては、例えば、膜厚の厚肉化やゴム硬度の高硬度化により、弾性仕切り膜の膜剛性を高め、弾性仕切り膜が往復動変位し難くすることで、変位規制部材との衝突を回避して、異音の発生を抑制することができるが、この場合には、弾性仕切り膜が両液室間の液圧変動に追従変形し難くなるため、その液圧変動の吸収が困難となり、低動ばね特性が得られなくなる。
そこで、従来は、例えば、特開平６−２２１３６８号公報に開示されているように、変位規制部材に放射状のリブを設けることで、弾性仕切り膜と変位規制部材との接触面積を小さくして、異音の発生を抑制していた（特許文献１）。
【特許文献１】
特開平６−２２１３６８号（図４など）
【発明の開示】
【発明が解決しようとする課題】
しかしながら、上述した従来の構成では、弾性仕切り膜と変位規制部材との衝突に起因して発生する異音を十分低減することができないという問題点があった。
本発明は上述した問題点を解決するためになされたものであり、比較的小振幅の振動入力時の低動ばね特性と比較的大振幅入力時の高減衰特性とを確保しつつ、異音の発生を十分に低減することができる液封入式防振装置及び液封入式防振装置ユニットを提供することを目的としている。
【課題を解決するための手段】
この目的を達成するために、請求の範囲第１項記載の液封入式防振装置は、第１取付け具と、筒状の第２取付け具と、その第２取付け具と前記第１取付け具とを連結し、ゴム状弾性材から構成される防振基体と、前記第２取付け具に取付けられて前記防振基体との間に液体封入室を形成するダイヤフラムと、前記液体封入室を前記防振基体側の第１液室と前記ダイヤフラム側の第２液室とに仕切る仕切り手段と、その仕切り手段の外周面と前記第２取付け具の内周面との間に形成され、前記第１液室と第２液室とを連通させるオリフィスとを備えるものであり、前記仕切り手段は、ゴム状弾性材から構成される弾性仕切り膜と、その弾性仕切り膜内に埋設され金属材料から略薄板状に構成される薄板部材と、前記弾性仕切り膜をその軸心方向で挟持固定する挟持部材とを備え、前記弾性仕切り膜は、その径方向外方側ほど薄肉のテーパー状に構成される第１ゴム部と、その第１ゴム部よりも径方向外方側に位置すると共に軸心方向に立ち上がる第２ゴム部とを備え、前記一対の挟持部材は、前記弾性仕切り膜の第１ゴム部を受け止め可能な第１ストッパ面部と、その第１ストッパ面部よりも軸心方向に後退して位置すると共に前記弾性仕切り膜の第２ゴム部を受け止め可能な第２ストッパ面部とを備え、前記薄板部材は、その外周縁が前記一対の挟持部材の径方向内方側の端面よりも径方向外方側に位置し、前記第１取付け具を車体フレーム側に連結される車体フレーム側連結手段として構成すると共に、前記第２取付け具を振動発生体側に連結される振動発生体側連結手段として構成することで、前記仕切り手段から前記車体フレームまでの振動伝達経路の一部が前記防振基体によって構成され、前記一対の挟持部材を熱可塑性の樹脂材料から構成し、互いの接合面を溶着手段により溶着することで、前記仕切り手段が一体的に構成されると共に、前記一対の挟持部材は、一方の接合面から突設される凸設部と、他方の接合面に凹設され前記凸設部を受け入れ可能な凹設部とを備え、前記仕切り手段の軸心方向で嵌合可能に構成されると共に、それら凸設部と凹設部とは、前記仕切り手段の組み立て状態において、前記凸設部の頂部と前記凹設部の底部とが当接するように凸設高さと凹設深さとがそれぞれ設定されている。
請求の範囲第２項記載の液封入式防振装置は、請求の範囲第１項記載の液封入式防振装置において、前記一対の挟持部材の第１ストッパ面部は、前記仕切り手段の径方向内方側の端部が断面円弧状に湾曲して形成されている。
請求の範囲第３項記載の液封入式防振装置は、請求の範囲第１又は第２項に記載の液封入式防振装置において、前記弾性仕切り膜は、略中心部に開口部が開口形成されており、前記薄板部材の周縁部のみが前記弾性仕切り膜内に埋設されるように構成されている。
請求の範囲第４項記載の液封入式防振装置は、請求の範囲第１から第３項のいずれかに記載の液封入式防振装置において、前記仕切り手段の組み立て状態においては、前記一対の挟持部材の第２ストッパ面部が前記弾性仕切り膜の第２ゴム部を前記仕切り手段の軸心方向へ押圧することで、その弾性仕切り膜の第２ゴム部に予圧縮が付与されるように構成されている。
請求の範囲第５項記載の液封入式防振装置ユニットは、請求の範囲第１から第４項のいずれかに記載の液封入式防振装置と、その液封入式防振装置を前記振動発生体側に連結する振動発生体側ブラケットとを備えたものであり、前記第２取付け具は、小径筒部と、その小径筒部よりも大径に形成される大径筒部と、その大径筒部と前記小径筒部とを連結する段差部とを備えると共に、前記大径筒部が前記振動発生体側ブラケットの内周部へ内嵌圧入されるものであり、前記振動発生体側ブラケットの内周部には、その内周部に内嵌圧入された前記第２取付け具の段差部に当接可能な当接部が径方向内方側に張り出して形成されている。
請求の範囲第６項記載の液封入式防振装置ユニットは、請求の範囲第５項記載の液封入式防振装置ユニットにおいて、前記第２取付け具は、前記大径筒部が前記小径筒部よりも前記第１取付け具側に位置すると共に、その大径筒部を前記振動発生体側ブラケットの内周部に内嵌圧入するものであり、その内嵌圧入状態では、前記第２取付け具の段差部が前記振動発生体側ブラケットの当接部よりも前記第１取付け具側に位置するように構成されている。
【発明の効果】
請求の範囲第１項記載の液封入式防振装置によれば、金属材料から略薄板状に構成される薄板部材を弾性仕切り膜内に埋設したので、比較的小振幅の振動入力時の低動ばね特性と比較的大振幅の振動入力時の高減衰特性とを確保しつつ、異音の発生を低減することができるという効果がある。
即ち、比較的大振幅の振動の入力に伴って弾性仕切り膜が変位する場合には、金属材料から構成される薄板部材が弾性仕切り膜の剛性を補強して、弾性仕切り膜全体としての変形を規制することができる。よって、液体をオリフィスへ円滑に流動させることができるので、流体流動効果を十分に発揮させ、高減衰特性を得ることができる。
その結果、従来の液封入式防振装置のように、弾性仕切り膜の変位を規制して膜剛性を高めるための変位規制部材を設ける必要がないので、その変位規制部材と弾性仕切り膜との当接（衝突）に起因する異音の発生を回避することができる。
更に、薄板部材の外周縁が挟持部材の径方向内方側の端面よりも径方向外方側に位置するように構成したので、仕切り手段の軸方向視において薄板部材の外周縁と一対の挟持部材とを重合させることができる。その結果、弾性仕切り膜の往復動変位をより規制し易くすることができるので、比較的大振幅の振動が入力される場合の高減衰特性をより確実に得ることができる。
一方、比較的小振幅の振動が入力される場合には、弾性仕切り膜が往復動変位することで、第１及び第２液室間の液圧差を吸収して、低動ばね特性を得ることができる。
ここで、従来の液封入式防振装置では、弾性仕切り膜へ第１又は第２液室の液圧を伝えるための開口面積が変位規制部材の分だけ狭くなるため、液圧差を吸収し難くなり、その分、低動ばね特性が得にくくなるという問題点があった。これに対し、本発明の液封入式防振装置によれば、変位規制部材を設ける必要がなく、開口面積の大幅な拡大が可能となるので、前記液圧差をより高効率に吸収することができ、その分、低動ばね特性を確実に得ることができる。
更に、弾性仕切り膜の第１ゴム部を径方向外方側ほど薄肉となるテーパー状に形成したので、かかるテーパー形状の作用により、弾性仕切り膜の往復動変位をより行い易くすることができ、その分、比較的小振幅の振動が入力される場合のばね特性の更なる低動ばね化を得ることができる。
そして、本発明の液封入式防振装置によれば、第１取付け具を車体フレーム側に連結される車体フレーム側連結手段として構成すると共に、第２取付け具を振動発生体側に連結される振動発生体側連結手段として構成したので、仕切り手段（弾性仕切り膜及び挟持部材）から車体フレームまでの振動伝達経路の一部を防振基体によって構成することができる。
その結果、例えば、弾性仕切り膜（第１ゴム部）と挟持部材（第１ストッパ面）との接触に起因して、挟持部材が振動したとしても、その振動が車体フレームへ伝達されることを、振動伝達経路の一部を構成する防振基体の振動絶縁効果により、確実に抑制して、異音の発生を十分に低減することができるという効果がある。
また、一対の挟持部材をそれぞれ樹脂材料から構成したので、金属材料から構成する場合と比較して、仕切り手段の大幅な軽量化を図ることができるという効果がある。
そして、それら一対の挟持部材の互いの接合面を溶着手段により溶着するように構成したので、例えば、金属材料から構成した部材をかしめ手段や溶接手段により一体化する場合と比較して、製造設備の小型化や工程の簡素化、消費エネルギーの削減などを図ることができるので、より迅速かつ低コストに一体化することができるという効果がある。
また、圧入手段により一体化する構成では、圧入部寸法公差の精密な管理が必要となり、管理コストが嵩むところ、本発明のように、溶着手段により一体化する構成であれば、前記管理コストの低減を図ることができるという効果がある。
また、一対の挟持部材は、その接合面に凸設部と凹設部とを備え、互いに仕切り手段の軸心方向で嵌合するように構成されているので、挟持部材の互いの接合面を溶着手段により溶着する場合には、挟持部材を仮固定した状態で溶着作業を行うことができ、その作業効率の向上を図ることができるという効果がある。また、軸心方向への嵌合により、一対の挟持部材を径方向へ相対的に位置決めすることができるので、溶着作業を行う際の径方向への位置決め作業を省略することができるという効果がある。
更に、これら凸設部及び凹設部は、凸設部の頂部と凹設部の底部とが当接可能に構成されているので、頂部と底部との当接面位置を、凸設部の突設高さ（凹設部の凹設深さ）の分だけ、挟持部材の一端面に近づけることができる。よって、かかる頂部と底部との当接面と超音波溶着手段の振動発信器（ホーン）やレーザー溶着手段のレーザー照射器との間の距離を近づけることができるので、溶着手段からの振動や熱を前記当接面に効率的に伝達することができ、その分、前記当接面の溶着をより確実に行うことができるという効果がある。
請求の範囲第２項記載の液封入式防振装置によれば、請求の範囲第１項記載の液封入式防振装置の奏する効果に加え、第１ストッパ面は、仕切り手段の径方向内方側の端部が断面円弧状に湾曲して構成されているので、その断面円弧状形状の作用により、弾性仕切り膜の往復動変位をし易くして、比較的小振幅の振動が入力される場合の低動ばね特性の向上を図りつつ、第１ストッパ面の端部との接触による第１ゴム部の摩耗や損傷を抑制して、弾性仕切り膜全体としての耐久性の向上を図ることができるという効果がある。
請求の範囲第３項記載の液封入式防振装置によれば、請求の範囲第１又は第２項に記載の液封入式防振装置の奏する効果に加え、弾性仕切り膜の略中心部に開口部を開口形成し、薄板部材の周縁部のみが前記弾性仕切り膜内に埋設されるように構成したので、開口部の開口分だけゴム状弾性体の使用量を低減して、その分、材料コストの削減を図ることができるという効果がある。
なお、このようなゴム状弾性体の使用量の低減は、従来の弾性仕切り膜では採用することが不可能（即ち、膜厚を薄くすると膜剛性の減少により減衰特性の低下を招く一方、ゴム硬度を高くして剛性を高めると、低動ばね特性が得られない）であり、本発明のように、弾性仕切り膜に薄板部材を埋設することで初めて採用可能となったものである。これにより材料コストの削減と軽量化、及び、動的特性（低動ばね特性と高減衰特性）の確保を同時に達成することができる。
また、このように、弾性仕切り膜の略中心部に開口部を設けることで、かかる開口部の開口面積を変更して、弾性仕切り膜全体としての剛性を適宜調整することができるという効果がある。その結果、所望の動的特性（例えば、高減衰特性や低動ばね特性）を得る為のチューニングを容易として、そのチューニングコストの低減を図ることができるという効果がある。
請求の範囲第４項記載の液封入式防振装置によれば、請求の範囲第１から第３項のいずれかに記載の液封入式防振装置の奏する効果に加え、仕切り手段の組み立て状態においては、一対の挟持部材の第２ストッパ面部が弾性仕切り膜の第２ゴム部を仕切り手段の軸心方向へ押圧して、その弾性仕切り膜の第２ゴム部に予圧縮が付与されるように構成したので、第２ストッパ面部間に第２ゴム部が充填され、これら第２ストッパ面部と第２ゴム部との間に隙間が生じることを抑制することができるという効果がある。
その結果、空気溜まりの発生を抑制することができるので、動的な特性への悪影響（例えば、減衰特性の低下）を回避することができると共に、仕切り手段を液槽外で一体化した後、その仕切り手段を液槽内で第２取付け具の筒状胴部内に挿入して、液封入式防振装置を組み立てることができるので、液槽内で複数の部品を第２取付け具内へ挿入する場合を比較して、組み立て性の向上を図ることができるという効果がある。
請求の範囲第５項記載の液封入式防振装置ユニットによれば、第２取付け具に段差部を設けると共に、振動発生体側ブラケットの内周部に当接部を設けたので、第２取付け具を振動発生体側ブラケットの内周部に内嵌圧入する場合には、段差部を当接部に当接させることで、圧入方向の位置決めを行うことができるという効果がある。更に、大振幅の振動の入力に伴って第２取付け具に対して圧入方向への加重が作用した場合には、段差部が当接部に当接することで、第２取付け具が振動発生体側ブラケットの内周部から抜けてしまうことを回避することができるという効果がある。
請求の範囲第６項記載の液封入式防振装置ユニットによれば、請求の範囲第５項記載の液封入式防振装置ユニットの奏する効果に加え、大径筒部が小径筒部よりも第１取付け具側に位置するように第２取付け具を構成するとともに、その大径筒部を振動発生体側ブラケットの内周部に内嵌圧入した場合には、第２取付け具の段差部が振動発生体側ブラケットの当接部よりも第１取付け具側に位置するように構成されているので、第２取付け具が振動発生体側ブラケットの内周部から抜けてしまうことをより確実に回避することができるという効果がある。
即ち、上記構成によれば、振動発生体を支持固定した後、振動発生体側ブラケットが分担荷重方向へ変位する場合（即ち、第２取付け具が第１取付け具へ向けて変位する場合）には、圧縮変形された防振基体の弾性回復力が第２取付け具の移動を妨げる力として働くので、第２取付け具が振動発生体側ブラケットの内周部から抜けやすくなるところ、請求の範囲第８項記載の液封入式防振装置ユニットによれば、第２取付け具の段差部が振動発生体側ブラケットの当接部に当接することで、上記抜けを回避することができる。
なお、振動発生体側ブラケットが分担荷重と反対方向へ変位する場合（即ち、第２取付け具が第１取付け具から離れる方向へ変位する場合）には、圧縮変形された防振基体の弾性回復力が第２取付け具の移動を補助する力として働き、第２取付け具が振動発生体側ブラケットの内周部から抜け難くなるので、上記抜けを防止する手段は不要となる。
【図面の簡単な説明】
【図１】 本発明の第１実施の形態における液封入式防振装置の使用状態を示す模式図であり、（ａ）は上面図であり、（ｂ）は図１（ａ）の矢印Ｉｂ方向から見た側面図である。
【図２】 図１（ａ）のＩＩ−ＩＩ線における液封入式防振装置の断面図である。
【図３】 （ａ）は、弾性仕切り膜の上面図であり、（ｂ）は、図３（ａ）のＩＩＩｂ−ＩＩＩｂ線における弾性仕切り膜の断面図である。
【図４】 （ａ）は、上側挟持部材の上面図であり、（ｂ）は、図４（ａ）のＩＶｂ−ＩＶｂ線における上側挟持部材の断面図である。
【図５】 （ａ）は、下側挟持部材の上面図であり、（ｂ）は、図５（ａ）のＶｂ−Ｖｂ線における下側挟持部材の断面図である。
【図６】 （ａ）は、仕切り手段の上面図であり、（ｂ）は、図６（ａ）のＶＩｂ−ＶＩｂ線における仕切り手段の断面図である。
【図７】 仕切り手段の部分拡大断面図である。
【図８】 第２実施の形態における液封入式防振装置の断面図である。
【図９】 第３実施の形態における液封入式防振装置の断面図である。
【図１０】 （ａ）は、仕切り手段の分解断面図であり、（ｂ）は、仕切り手段の断面図である。
【符号の説明】
１００，２００ 液封入式防振装置（液封入式防振装置ユニットの一部）
１ 第１取付け金具（第１取付け具、車体フレーム側連結手段）
２ 第２取付け金具（第２取付け具、振動発生体側連結手段）
２ａ 大径筒部
２ｂ 小径筒部
３ 防振基体
５ ダイヤフラム
６ 液体封入室
６Ａ 第１液室
６Ｂ 第２液室
２０ オリフィス
７，１７ 仕切り手段
８ 弾性仕切り膜（仕切り手段の一部）
８ａ 開口部
８ｃ 第１ゴム部
８ｄ 第２ゴム部
８１ 薄板部材（仕切り手段の一部）
９，１９ 上側挟持部材（挟持部材、仕切り手段の一部）
１０，１１０ 下側挟持部材（挟持部材、仕切り手段の一部）
９ａ，１０ａ 第１ストッパ面部
９ｂ，１０ｂ 第２ストッパ面部
１９ｅ 凸設部
１９ｅ１ 頂部
１１０ｅ 凹設部
１１０ｅ１ 底部
ＥＧ エンジン（振動発生体）
ＢＦ 車体フレーム
Ｂ２，Ｂ１２ エンジン側ブラケット（振動発生体側ブラケット、液封入式防振装置ユニットの一部）
Ｂ１２ｂ 当接部（振動発生体側ブラケットの当接部）
【発明を実施するための最良の形態】
以下、本発明の好ましい実施の形態について、添付図面を参照して説明する。図１は、本発明の第１実施の形態における液封入式防振装置１００の使用状態を示す模式図であり、（ａ）は、上面図であり、（ｂ）は、図１（ａ）の矢印Ｉｂ方向から見た側面図である。
液封入式防振装置１００は、自動車のエンジンＥＧを支持固定しつつ、そのエンジンＥＧの振動を車体フレームＢＦへ伝達させないようにするための防振装置であり、図１に示すように、車体フレーム側ブラケットＢ１を介して車体フレームＢＦに連結される一方、エンジン側ブラケットＢ２を介してエンジンＥＧに連結される。
なお、車体フレーム側ブラケットＢ１は、取付け穴Ｂ１ａに挿通されたボルト（図示せず）により車体フレームＢＦに締結固定され、エンジン側ブラケットＢ２は、取付け穴Ｂ２ａに挿通されたボルト（図示せず）によりエンジン側部材ＥＧ１に締結固定される。従って、エンジンＥＧを支持固定する液封入式防振装置１００には、図１（ｂ）の下方向へ向けて分担荷重が作用する。
図２は、図１（ａ）のＩＩ−ＩＩ線における液封入式防振装置１００の断面図である。なお、図２では、第１取付け金具１の断面視を省略して図示している。また、図２中に１点鎖線で示した中心線は、液封入式防振装置１００の軸心Ｏを示す。
液封入式防振装置１００は、図２に示すように、車体フレーム側ブラケットＢ１を介して車体フレームＢＦ（図１（ｂ）参照）側に取り付けられる第１取付け金具１と、エンジン側ブラケットＢ２を介してエンジンＥＧ（図１（ｂ）参照）側に取付けられる筒状の第２取付け金具２と、これらを連結すると共にゴム状弾性体から構成される防振基体３とを主に備えている。
第１取付け金具１は、図２に示すように、アルミニウム合金などから軸心回りに対称な上窄まりの断面略円錐台形状に形成され、その下端面には、車体フレームＢ１との締結固定用のめねじ部１１が上方へ向けて凹設されている。また、めねじ部１１の側方には、車体フレーム側ブラケットＢ１の凹部に嵌合する位置決めピン１２が突設されている。
第２取付け金具２は、図２に示すように、鉄鋼材料から上下端（図２上側及び下側）が開口した筒状に構成されている。なお、第２取付け金具２は、段差を有して構成されており、その段差の下側（図２下側）が大径筒部２ａとされ、段差の上側（図２上側）が小径筒部２ｂとされている。なお、第２取付け金具２は、図２に示すように、その大径筒部２ａがエンジン側ブラケットＢ２の内周部に内嵌圧入されている。
防振基体３は、図２に示すように、ゴム状弾性体から軸心回りに対称な下窄まりの断面略円錐台形状に形成され、第１取付け金具１の上端面及び側面と第２取付け金具２の下端側（主に大径筒部２ａ）内周部との間に加硫接着されている。
このように、本実施の形態の液封入式防振装置１００によれば、第１取付け金具１を車体フレームＢＦ側に連結される車体フレーム側連結手段として構成すると共に、第２取付け金具２をエンジンＥＧ（振動発生体）側に連結される振動発生体側連結手段として構成したので、後述する仕切り手段７から車体フレームＢＦまでの振動伝達経路の一部が防振基体３によって構成される。
その結果、例えば、仕切り手段７において、弾性仕切り膜８が上側又は下側挟持部材９，１０に衝突して、それら上側又は下側挟持部材９，１０が振動したとしても、その振動が車体フレームＢＦへ伝達されることを、振動伝達経路の一部を構成する防振基体３の振動絶縁効果により、確実に抑制して、異音の発生を大幅に低減することができる。
防振基体３の上端部（図２上側）には、図２に示すように、第２取付け金具２（主に小径筒部２ｂ）の内周面を覆うゴム膜３１が連設されており、このゴム膜３１には、後述する上側及び下側挟持部材９，１０の張り出し壁９ｄ，１０ｄ（図４及び図５参照）及びダイヤフラム５の取付け金具５１がそれぞれ密着されている。
ダイヤフラム５は、図２に示すように、ゴム状弾性体から部分球状を有するゴム膜状に構成されるものであり、第２取付け金具２（小径筒部２ｂ）の上端部（図２上側）に取着されている。その結果、このダイヤフラム５の下面側と防振基体３の上面側との間には、液体封入室６が形成されている。
この液体封入室６には、エチレングリコールなどの不凍性の液体（図示せず）が封入されている。また、液体封入室６は、図２に示すように、仕切り手段７（弾性仕切り膜８及び上側及び下側挟持部材９，１０）によって、防振基体３側（図２下側）の第１液室６Ａと、ダイヤフラム５側（図２上側）の第２液室６Ｂとの２室に仕切られている。
なお、ダイヤフラム５は、上面視ドーナツ状の取付け金具５１に加硫接着されており、図２に示すように、その取付け金具５１を介して、第２取付け金具２の上端部（図２上側）に取着されている。
仕切り手段７は、上述したように、液体封入室６を第１液室６Ａと第２液室６Ｂとに仕切るものであり、ゴム状弾性材から略円板状に構成される弾性仕切り膜８と、その弾性仕切り膜８をその軸心方向で挟持固定する上側及び下側挟持部材９，１０とを主に備えている。
仕切り手段７（上側及び下側挟持部材９，１０）の外周側には、図２に示すように、第２取付け金具２の内周側（ゴム膜３１）との間にオリフィス２０が形成されている。このオリフィス２０は、第１液室６Ａと第２液室６Ｂとを互いに連通させるオリフィス流路である。
なお、オリフィス２０は、上側挟持部材９の張り出し壁９ｄ（図４参照）に切り欠き形成される切欠き部９ｄ１を介して、第２液室６Ｂに連通される一方、下側挟持部材１０の張り出し壁１０ｄ（図５参照）に切り欠き形成される切り欠き部１０ｄ１を介して、第１液室６Ａに連通されている。
ここで、液封入式防振装置１００の組み立ては、まず、第２取付け金具２の上端側（図２上側）開口部から仕切り手段７とダイヤフラム５とを順に嵌め込み、次いで、第２取付け金具２の小径筒部２ｂ全体を径方向（図２左右方向）に縮径加工（絞り加工）することにより行われる。なお、小径筒部２ｂの上端（図２上側）は、その全周にわたって予め径方向内方側に折り曲げ加工されている。
その結果、仕切り手段７（上側及び下側挟持部材９，１０）は、図２に示すように、防振基体３に設けた仕切り手段受け部３２とダイヤフラム５との間で、液封入式防振装置１００の軸芯方向（図２上下方向）に挟持固定される。なお、仕切り手段受け部３２は、防振基体３の上面側の複数箇所（或いは全周）に段部として形成されており、その段部によって仕切り手段７（下側挟持部材１０）の下端面（図２下側面）を受け止める。
この組み立て状態においては、仕切り手段受け部３２が圧縮変形されており、この仕切り手段受け部３２の弾性復元力が仕切り手段７の保持力としてその仕切り手段７の下端面に作用されている。これにより、大振幅や高周波数の振幅が入力された場合などでも、仕切り手段７を強固かつ安定的に挟持固定して、各部材８，９，１０の位置ずれや共振などに起因する動的な特性への影響を回避することができる。
次いで、図３から図７を参照して、仕切り手段７を構成する各部材８，９，１０について順次説明する。なお、各部材８，９，１０の説明においては、仕切り手段７の上面図およびその断面図である図６及び図７を適宜参照する。また、各図中に１点鎖線で示した中心線は、各部材８，９，１０の軸心Ｏを示す。
まず、図３を参照して、弾性仕切り膜８について説明する。図３（ａ）は、弾性仕切り膜８の上面図であり、図３（ｂ）は、図３（ａ）のＩＩＩｂ−ＩＩＩｂ線における弾性仕切り膜８の断面図である。
図３に示すように、弾性仕切り膜８は、ゴム状弾性体から略円板状に構成され、その内部には、金属材料から略薄板状に構成される薄板部材８１が軸心Ｏ方向（図３（ｂ）上下方向）略中間部に埋設されている。薄板部材８１は、弾性仕切り膜８と同心の略円板状に構成されている。
なお、弾性仕切り膜８の略中心部には、図３（ａ）に示すように、軸心Ｏ方向視略円形の開口部８ａが両面に開口形成されており、薄板部材８１は、図３（ｂ）に示すように、その周縁部のみが弾性仕切り膜８内に埋設されている。また、薄板部材１３の最外周縁は、後述する第１ゴム部８ｃと第２ゴム部８ｄとの境界部に位置している。
弾性仕切り膜８は、図３（ｂ）に示すように、略一定の肉厚に形成されるゴム膜部８ｂと、そのゴム膜部８ｂよりも径方向外方側に位置すると共に径方向外方側ほど薄肉のテーパー形状に形成される（即ち、軸心Ｏ方向（図３（ｂ）上下方向）にくびれた）第１ゴム部８ｃと、その第１ゴム部８ｃよりも径方向外方側に位置し、かつ、軸心Ｏ方向へ立ち上がることでゴム膜部８ｂ及び第１ゴム部８ｃよりも高く形成される第２ゴム部８ｄとを備えて構成されている。第２ゴム部８ｄの両先端部は、先端方向（図３（ｂ）上又は下方向）に凸の断面円弧状に湾曲して形成されている。
なお、弾性仕切り膜８は、第１及び第２ゴム部８ｃ，８ｄが上側及び下側挟持部材９，１０によって軸心Ｏ方向（図２（ｂ）上下方向）に押圧され（挟み込まれ）、仕切り手段７の組み立て状態においては、第１及び第２ゴム部８ｃ，８ｄに軸心Ｏ方向への予圧縮が付与される（図６参照）。
ここで、本実施の形態では、第１ゴム部８ｃの一部（径方向外方側の一部）にのみ予圧縮が付与されるが（図７参照）、第１ゴム部８ｃの全体に予圧縮が付与されるように、第１ゴム部の膜厚および第１ストッパ面部９ａ，１０ａの高さを設定しても良い。
このように、第１及び第２ゴム部８ｃ，８ｄに予圧縮を付与することで、弾性仕切り膜８と上側及び下側挟持部材９，１０との間に隙間が生じることを抑制して、空気溜まり（気泡）の発生を回避することができる。その結果、動的な特性への悪影響を回避することができる。また、仕切り手段７（図５参照）を液槽外で組み立てた後、その仕切り手段７を液槽内で第２取付け具２内に挿入して、液封入式防振装置１００（図２参照）を組み立てることができるので、組み立て性の向上を図ることもできる。
次に、図４を参照して、上側挟持部材９について説明する。図４（ａ）は、上側挟持部材９の上面図であり、図４（ｂ）は、図４（ａ）のＩＶｂ−ＩＶｂ線における上側挟持部材９の断面図である。
上側挟持部材９は、アルミニウム合金などの金属材料から略円筒状に構成され、下側挟持部材１０と圧入手段により一体化される。これにより、下側挟持部材１０と共に弾性仕切り膜８の周縁部を挟持固定しつつ（図６参照）、仕切り手段７を構成する。
この上側挟持部材９の下端（図４（ｂ）下側）には、図４（ｂ）に示すように、弾性仕切り膜８の第１ゴム部８ｃを押圧する第１ストッパ面部９ａと、その第１ストッパ面部９ａよりも径方向外方側に位置し、かつ、第１ストッパ面部９ａよりも軸心方向に後退して形成（凹設）される第２ストッパ面部９ｂとが全周にわたって形成されている。
なお、本実施の形態では、第１ストッパ面部９ａの径方向内方側及び外方側の両方の端部が断面円弧状に湾曲して形成される一方、第２ストッパ面部９ｂは、径方向内方側の端部が断面円弧状に形成され、径方向外方側の端部が直線状に形成されている（図７参照）。これにより、予圧縮が付与された弾性仕切り膜８（第２ゴム部８ｄ）が変形するためのスペースが確保されている。
上側挟持部材９の外周側には、図４（ｂ）に示すように、圧入面部９ｃと張り出し壁９ｄとが全周にわたって設けられている。
圧入面部９ｃは、下側挟持部材１０の圧入面部１０ｃ（図５参照）が外嵌圧入される部位であり、第２ストッパ面部９ｂに連設されている。一方、張り出し壁９ｄは、オリフィス２０（図１参照）を形成するためのオリフィス形成壁であり、径方向外方側へ張り出して形成されている。
なお、張り出し壁９ｄの周方向の一部には、図４（ａ）に示すように、上面視略コ字状の切り欠き部９ｄ１が切り欠き形成されている。この切り欠き部９ｄ１は、オリフィス２０を第２液室６Ｂに連通するためのオリフィス出入口である（図１参照）。
次に、図５を参照して、下側挟持部材１０について説明する。図５（ａ）は、下側挟持部材１０の上面図であり、図５（ｂ）は、図５（ａ）のＶｂ−Ｖｂ線における下側挟持部材１０の断面図である。
下側挟持部材１０は、アルミニウム合金などの金属材料から略円筒状に構成され、上述した上側挟持部材９と圧入手段により一体化される。これにより、上述したように、上側挟持部材９と共に弾性仕切り膜８の周縁部を挟持固定しつつ（図６参照）、仕切り手段７を構成する。
この下側挟持部材１０の内周側下端（図５（ｂ）下側）には、図５（ｂ）に示すように、張り出し部が径方向内方側へ張り出し形成されており、この張り出し部には、弾性仕切り膜８の第１ゴム部８ｃを押圧する第１ストッパ面部１０ａと、その第１ストッパ面部１０ａよりも径方向外方側に位置し、かつ、第１ストッパ面部１０ａよりも軸心方向に後退して形成（凹設）される第２ストッパ面部１０ｂとが全周にわたって形成されている。
なお、本実施の形態では、第１及び第２ストッパ面部１０ａ，１０ｂの径方向内方側及び外方側の両方の端部が断面円弧状に湾曲して形成されている（図７参照）。
また、図５に示すように、下側挟持部材１０は、その内周側に圧入面部１０ｃが設けられると共に、外周側に張り出し壁９ｄが全周にわたって設けられている。
圧入面部１０ｃは、上述したように、上側挟持部材９の圧入面部９ｃ（図４参照）に外嵌圧入する部位であり、第２ストッパ面部１０ｂに連設されている。一方、張り出し壁１０ｄは、上述した張り出し壁９ｄと共にオリフィス２０（図１参照）を形成するためのオリフィス形成壁であり、径方向外方側へ張り出して形成されている。
張り出し壁１０ｄの周方向の一部には、図５（ａ）に示すように、上面視略コ字状の切り欠き部１０ｄ１が切り欠き形成されている。この切り欠き部１０ｄ１は、オリフィス２０を第１液室６Ａに連通するためのオリフィス出入口である。
また、下側挟持部材１０の外周部には、その周方向の一部に縦壁１０ｅが立設されている。この縦壁１０ｅは、オリフィス２０（図１参照）を周方向に分断するための壁部であり、仕切り手段７は、この縦壁１０ｅが周方向において上側及び下側挟持部材９，１０の切り欠き部９ｄ１，１０ｄ１の間に位置するように組み立てられる（図６参照）。
次に、図６及び図７を参照して、仕切り手段７について説明する。図６（ａ）は、仕切り手段７の上面図であり、図６（ｂ）は、図６（ａ）のＶＩｂ−ＶＩｂ線における仕切り手段７の断面図である。また、図７は、仕切り手段７の部分拡大断面図である。
仕切り手段７の組み立ては、液槽外で行われ、まず、弾性仕切り膜８を上側及び下側挟持部材９，１０によって軸心Ｏ方向の両側から挟持する。次いで、上側挟持部材９を下側挟持部材１０へ向けて軸心Ｏ方向へ更に押し込むことで、上側挟持部材９の圧入面部９ｃに下側挟持部材１０の圧入面部１０ｃを外嵌圧入する。これにより、図６に示すように、仕切り手段７が複数の部材８〜１０により一体的に構成される。
なお、一体化された仕切り手段７は、液槽内に浸漬され、その液槽内で第２取付け金具２内に挿入される。
この場合、弾性仕切り膜８の第１及び第２ゴム部８ｃ，８ｄには、上側及び下側挟持部材９，１０の第１及び第２ストッパ面部９ａ，９ｂ，１０ａ，１０ｂによる軸心Ｏ方向への押圧力が作用して、予圧縮が付与される。その結果、図７に示すように、第１及び第２ゴム部１３ｃ，１３ｄが第１及び第２ストッパ面部１４ａ〜１５ｂにより囲まれる空間内に充填される。但し、第１ゴム部８ｃには、上述したように、その一部（径方向外方側）にのみ予圧縮が付与される。
また、仕切り手段７の組み立て状態においては、図６及び図７に示すように、薄板部材８１の外周縁が上側及び下側挟持部材９，１０の径方向内方側の端面よりも径方向外方側に位置するように構成されている。そのため、仕切り手段７の軸心方向視においては、薄板部材１３の外周縁が上側及び下側挟持部材９，１０と重合する。
また、図７に示すように、第１ゴム部８ｃと第１ストッパ面部９ａ，１０ａとの間には、径方向内方側（図７右側）において、隙間が形成されている。これにより、弾性仕切り膜８の往復動変形をし易くして、比較的小振幅の振動が入力される場合の低動ばね特性の向上が図られている。
なお、このように隙間を設けることは、低動ばね特性の確保には有効であるが、往復動変位する弾性仕切り膜８が第１ストッパ面部９ａ，１０ａと衝突して異音の発生を招くという不具合がある。しかしながら、本発明では、仕切り手段７から車体フレームＢＦへの振動伝達経路の一部を防振基体３で構成したので（図１及び図２参照）、前記衝突に起因する振動が車体フレームＢＦへ伝達されることを、防振基体３の振動絶縁効果により、確実に抑制して、異音の発生を大幅に低減することができる。
次いで、図８を参照して、第２実施の形態について説明する。第１実施の形態では、エンジン側ブラケットＢ２の内周部を断面直線状に形成したが、第２実施の形態のエンジン側ブラケットＢ１２は、その内周部に当接部Ｂ１２ｂが形成されている。なお、上記した第１実施の形態と同一の部分には同一の符号を付して、その説明は省略する。
図８は、液封入式防振装置１００の断面図であり、図１（ａ）のＩＩ−ＩＩ線における断面図に対応する。図８に示すように、エンジン側ブラケットＢ１２の内周部には、当接部Ｂ１２ｂが径方向内方側に張り出して形成されている。よって、第２取付け金具２をエンジン側ブラケットＢ１２の内周部に内嵌圧入する場合には、その段差部を当接部Ｂ１２ｂに当接させることで、圧入方向の位置決めを行うことができる。
更に、第２取付け金具２は、大径筒部２ａが小径筒部２ｂよりも第１取付け金具１側に位置すると共に、図８に示す内嵌圧入状態では、第２取付け金具２の段差部がエンジン側ブラケットＢ１２の当接部Ｂ１２ｂよりも第１取付け金具１側に位置するように構成されている。その結果、第２取付け金具２がエンジン側ブラケットＢ１２の内周部から抜けてしまうことをより確実に回避することができる。
次いで、図９及び図１０を参照して、第３実施の形態について説明する。第１実施の形態では、上側及び下側挟持部材９，１０が圧入手段により一体化される場合を説明したが、第２実施の形態の上側及び下側挟持部材１９，１１０は、溶着手段により一体化される。なお、上記した第１実施の形態と同一の部分には同一の符号を付して、その説明は省略する。
図９は、液封入式防振装置２００の断面図であり、図１（ａ）のＩＩ−ＩＩ線における断面図に対応する。また、図１０（ａ）は、仕切り手段１７の分解断面図であり、図１０（ｂ）は、仕切り手段１７の断面図である。
第３実施の形態における上側及び下側挟持部材１９，１１０は、熱可塑性の樹脂材料から軸心Ｏを有する略円環状に構成されており、図１０に示すように、弾性仕切り膜８の周縁部を挟持した状態で溶着手段により互いの接合面が溶着される。これにより、一体化されて、仕切り手段１７を構成する（図１０（ｂ）参照）。
ここで、図１０（ａ）に示すように、上側挟持部材１９には、第２ストッパ面部９ｂの径方向外方側に凸設部１９ｅが全周にわたって凸設され、下側挟持部材１１０には、第２ストッパ面部１０ｂの径方向外方側に凹設部１１０ｅが全周にわたって凹設されている。
これら凸設部１９ｅと凹設部１１０ｅとは、軸心方向で嵌合可能に構成されており、その当接面（凸設部１９ｅの外面と凹設部１１０ｅの内面と）が溶着手段により溶着される接合面とされている。
なお、仕切り手段７の組み立て状態では、図１０（ｂ）に示すように、凸設部１９ｅの頂部１９ｅ１と凹設部１１０ｅの底部１１０ｅ１とが当接されるように、凸設部１９ｅの凸設高さと凹設部１１０ｅの凹設深さとが設定されており、この当接部（底部１４ｅ１と頂部１５ｃ１と）が溶着手段により主に溶着される。
ここで、溶着手段としては、例えば、超音波溶着法やレーザー溶着法などの公知の技術が例示される。超音波溶着法は、上側及び下側挟持部材１９，１１０の接合面（即ち、凸設部１９ｅの頂部１９ｅ１と凹設部１１０ｅの底部１１０ｅ１）に圧力と超音波による振動を加え、その摩擦熱によって接合面における樹脂材料を溶融・接合するものである。
また、レーザー溶着法は、上側挟持部材１９を光透過性の熱可塑性樹脂材料から構成する一方、下側挟持部材１１０を光吸収性の熱可塑性樹脂材料から構成し、接合面（即ち、凸設部１９ｅの頂部１９ｅ１と凹設部１１０ｅの底部１１０ｅ１）に圧力を加えながらその境界付近にレーザービームの焦点を合わせて照射することで、凸設部１９ｅの頂部１０ｅ１（光吸収性の樹脂材料）を発熱させると共に、その熱が凹設部１１０ｅの底部１１０ｅ１にも伝わることで、接合面を溶融・接合するものである。
なお、接合面の上記溶着手段による溶着は、周方向に部分的（例えば、周方向に９０°間隔に４カ所）に行われるものであっても良く、或いは、周方向全周に行われるものであっても良い。部分的に行うものであれば、溶着コストを削減することができる一方、全周に行うものであれば、接合強度の信頼性を確保することができる。
以上、実施の形態に基づき本発明を説明したが、本発明は上記実施の形態に何ら限定される物ではなく、本発明の趣旨を逸脱しない範囲内で種々の改良変形が可能であることは容易に推察できるものである。
例えば、上記各実施の形態では、本発明の適用対象として、自動車のエンジンＥＧと車体フレームＢＦとの間に設けられる液封入式防振装置１００，２００を例に説明したが、必ずしもこれに限られるものではなく、他の液封入式防振装置に本発明を適用することは当然可能である。例えば、トランスミッション（振動発生体）と車体フレームとの間に設けられる液封入式防振装置に本発明を適用しても良い。
また、上記各実施の形態では、第２取付け金具２の大径筒部２ａをエンジン側ブラケットＢ２の内周部に内嵌圧入する場合を説明したが、必ずしもこれに限られるわけではなく、第２取付け金具２の小径筒部２ｂをエンジン側ブラケットＢ２の内周部に内嵌圧入するように構成しても良い。
なお、このように構成した場合には、第２取付け金具２の段差部をエンジン側ブラケットＢ２の開口部に当接させることができるので、上述した当接部Ｂ１２ｂを設ける場合と同様に、内嵌圧入時の位置決めや圧入部の抜け防止効果を得ることができる。
また、上記第３実施の形態では、液封入式防振装置２００が、第１実施の形態における液封入式防振装置１００と同様に、内周部を直線状に形成したエンジン側ブラケットＢ２に圧入される場合を説明したが、必ずしもこれに限られるものではなく、第２実施の形態の場合と同様に、当接部Ｂ１２ｂを有するエンジン側ブラケットＢ１２に液封入式防振装置２００を圧入して構成することは当然可能である。
また、上記各実施の形態では説明を省略したが、車体フレーム側ブラケットＢ１の内周面（液封入式防振装置１００，２００の収容空間の内周面）と、エンジン側ブラケットＢ２の外周面とに、それぞれゴム状弾性体を加硫接着等により取着して、変位規制を可能とすることで、大変位入力時のストッパ作用が得られるように構成しても良い。【Technical field】
  The present invention relates to a liquid-filled vibration isolator and a liquid-filled vibration isolator unit, and in particular, ensures a low dynamic spring characteristic when a relatively small amplitude vibration is input and a high damping characteristic when a relatively large amplitude is input. However, the present invention relates to a liquid-filled vibration isolator and a liquid-filled vibration isolator unit that can sufficiently reduce the occurrence of abnormal noise.
[Background]
  2. Description of the Related Art A liquid-filled vibration isolator is known as a vibration isolator that supports and fixes a vibration generating body such as an automobile engine or transmission and prevents the vibration from being transmitted to a vehicle body frame.
  In this liquid-filled vibration isolator, generally, a first attachment attached to the engine side and a second attachment attached to the vehicle body frame are connected by an anti-vibration base composed of a rubber-like elastic body. . And the liquid enclosure chamber is formed between the diaphragm and the vibration isolating base by the diaphragm attached to the second fixture.
  The liquid sealing chamber is partitioned into two chambers, a first liquid chamber and a second liquid chamber, by a partitioning means, and the first and second liquid chambers are communicated with each other by an orifice. According to this liquid-filled vibration isolator, the vibration damping function and the vibration insulating function are achieved by the fluid flow effect between the first and second liquid chambers by the orifice and the vibration damping effect of the vibration isolating substrate.
  Here, there is a liquid-filled type vibration damping device in which the partition means includes an elastic partition film and a pair of displacement regulating members that regulate the displacement amount of the elastic partition film from both sides.
  According to this type of liquid-filled vibration isolator, when a relatively small amplitude vibration is input, the elastic partition membrane is reciprocally displaced to absorb the fluid pressure fluctuation between the two liquid chambers. A low dynamic spring characteristic can be obtained. On the other hand, for example, when relatively large amplitude vibration is input due to unevenness on the road surface, the displacement amount of the elastic partition film is regulated from both sides by a displacement regulating member to increase the membrane rigidity. The fluid can easily flow between the two liquid chambers through the orifice, and a high attenuation characteristic can be obtained.
  However, since this type of liquid-filled vibration isolator has a structure in which the elastic partition film collides (contacts) with the displacement regulating member, the displacement regulating member vibrates at the time of the collision, and the vibration is transmitted to the vehicle body frame. There is a problem that abnormal noise is generated by the transmission.
  To solve this problem, for example, by increasing the film rigidity of the elastic partition film by increasing the thickness of the film or by increasing the hardness of the rubber, the elastic partition film is less likely to be reciprocally displaced. In this case, the elastic partition membrane is less likely to deform following the hydraulic pressure fluctuation between the two fluid chambers. Absorption becomes difficult and low dynamic spring characteristics cannot be obtained.
  Therefore, conventionally, for example, as disclosed in JP-A-6-221368, by providing a radial rib on the displacement regulating member, the contact area between the elastic partition film and the displacement regulating member is reduced, The generation of abnormal noise was suppressed (Patent Document 1).
[Patent Document 1]
  JP-A-6-221368 (FIG. 4 etc.)
DISCLOSURE OF THE INVENTION
[Problems to be solved by the invention]
  However, the conventional configuration described above has a problem in that it is not possible to sufficiently reduce the abnormal noise generated due to the collision between the elastic partition film and the displacement regulating member.
  The present invention has been made in order to solve the above-described problems, and has ensured a low dynamic spring characteristic at the time of relatively small amplitude vibration input and a high damping characteristic at the time of relatively large amplitude input. An object of the present invention is to provide a liquid-filled vibration isolator and a liquid-filled vibration isolator unit that can sufficiently reduce the occurrence of the above.
[Means for Solving the Problems]
  In order to achieve this object, a liquid-filled vibration isolator according to claim 1 includes a first fixture, a cylindrical second fixture, the second fixture, and the first fixture. A vibration-proof base made of a rubber-like elastic material, a diaphragm attached to the second fixture to form a liquid-filled chamber between the vibration-proof base, and the liquid-filled chamber Partitioning means for partitioning into a first liquid chamber on the side of the vibration isolating base and a second liquid chamber on the side of the diaphragm; formed between an outer peripheral surface of the partitioning means and an inner peripheral surface of the second fixture; An orifice that allows the first liquid chamber and the second liquid chamber to communicate with each other, and the partition means includes an elastic partition film made of a rubber-like elastic material and a metal material embedded in the elastic partition film. A thin plate member configured in a thin plate shape and the elastic partition film in the axial direction The elastic partition membrane is positioned at a radially outer side than the first rubber portion, and a first rubber portion having a tapered shape that is thinner toward the radially outer side. And a second rubber part rising in the axial direction, and the pair of clamping members includes a first stopper surface part capable of receiving the first rubber part of the elastic partition film, and an axial center than the first stopper surface part. And a second stopper surface portion capable of receiving the second rubber portion of the elastic partition film and retreating in the direction, and the outer peripheral edge of the thin plate member is radially inward of the pair of clamping members. A vibration generator is located on the radially outer side of the end surface and constitutes the vehicle body frame side connecting means for connecting the first fixture to the vehicle body frame side, and the second fixture is connected to the vibration generator side. As a body side connection means By forming a part of the vibration transmission path from said partition means to the vehicle body frame is constituted by the vibration-isolating baseThe pair of sandwiching members are made of a thermoplastic resin material, and the joining means are integrally formed by welding the joint surfaces to each other by the welding means. A convex portion projecting from the joint surface; and a concave portion recessed in the other joint surface and capable of receiving the convex portion, and configured to be fitted in the axial direction of the partition means. In addition, the convex portion and the concave portion have a convex height and a concave depth so that the top of the convex portion and the bottom of the concave portion abut in the assembled state of the partition means. Seting.
  The liquid-filled vibration isolator according to claim 2 is the liquid-filled vibration isolator according to claim 1, wherein the first stopper surface portions of the pair of clamping members are in the radial direction of the partition means. The inward end is curved in a circular arc shape in cross section.
  The liquid-filled vibration isolator according to claim 3 is the liquid-filled vibration isolator according to claim 1 or 2, wherein the elastic partition film has an opening at a substantially central portion. It is formed and it is comprised so that only the peripheral part of the said thin-plate member may be embed | buried in the said elastic partition film.
  The liquid-filled vibration isolator according to claim 4 is the liquid-filled vibration isolator according to any one of claims 1 to 3, wherein the pair of the vibration-proof vibration isolator is in the assembled state of the partition means. The second stopper surface portion of the clamping member presses the second rubber portion of the elastic partition membrane in the axial direction of the partition means so that pre-compression is applied to the second rubber portion of the elastic partition membrane. It is configured.
  The scope of the claimsItem 5The liquid-filled vibration isolator unit according to claim 1 from the first claimItem 4And a vibration generator-side bracket that connects the liquid-sealed vibration isolator to the vibration generator side, and the second mounting tool is a small-diameter cylinder. And a step portion connecting the large-diameter cylindrical portion and the small-diameter cylindrical portion, and the large-diameter cylindrical portion is the vibration It is press-fitted into the inner peripheral portion of the generator-side bracket, and the inner peripheral portion of the vibration-generating bracket is brought into contact with the stepped portion of the second fixture that is press-fitted into the inner peripheral portion thereof. A possible abutting portion is formed to protrude radially inward.
  The scope of the claimsItem 6The liquid-filled vibration isolator unit described in claimItem 5In the liquid-filled vibration isolator unit described above, the second fixture is configured such that the large-diameter cylindrical portion is positioned closer to the first fixture than the small-diameter cylindrical portion, and the large-diameter cylindrical portion generates the vibration. In the inner fitting press-fitted state, the step portion of the second fixture is positioned closer to the first fixture than the contact portion of the vibration generator-side bracket. Is configured to do.
【The invention's effect】
  According to the liquid-filled vibration isolator according to claim 1, since the thin plate member made of a metal material and having a substantially thin plate shape is embedded in the elastic partition film, the low vibration level when a relatively small amplitude vibration is input. There is an effect that the generation of abnormal noise can be reduced while securing the dynamic spring characteristics and the high damping characteristics at the time of vibration input with a relatively large amplitude.
  That is, when the elastic partition membrane is displaced with the input of a relatively large amplitude vibration, the thin plate member made of a metal material reinforces the rigidity of the elastic partition membrane and deforms the entire elastic partition membrane. Can be regulated. Therefore, since the liquid can be smoothly flowed to the orifice, the fluid flow effect can be sufficiently exhibited and high attenuation characteristics can be obtained.
  As a result, unlike the conventional liquid-filled vibration isolator, it is not necessary to provide a displacement restricting member for restricting the displacement of the elastic partition film to increase the film rigidity, so that the displacement restricting member and the elastic partition film Occurrence of abnormal noise due to contact (collision) can be avoided.
  Further, since the outer peripheral edge of the thin plate member is positioned on the radially outer side of the end surface on the radially inner side of the sandwiching member, the pair of sandwiches with the outer peripheral edge of the thin plate member in the axial direction of the partition means The member can be polymerized. As a result, it is possible to more easily regulate the reciprocating displacement of the elastic partition membrane, so that it is possible to more reliably obtain a high damping characteristic when a relatively large amplitude vibration is input.
  On the other hand, when a relatively small amplitude vibration is input, the elastic partition membrane is reciprocally displaced to absorb the hydraulic pressure difference between the first and second liquid chambers and obtain a low dynamic spring characteristic. Can do.
  Here, in the conventional liquid-filled vibration isolator, the opening area for transmitting the fluid pressure of the first or second fluid chamber to the elastic partition membrane is narrowed by the displacement regulating member, so that it is difficult to absorb the fluid pressure difference. Therefore, there is a problem that low dynamic spring characteristics are difficult to obtain. On the other hand, according to the liquid-filled vibration isolator of the present invention, it is not necessary to provide a displacement restricting member, and the opening area can be greatly enlarged, so that the liquid pressure difference can be absorbed more efficiently. Therefore, the low dynamic spring characteristic can be obtained with certainty.
  Furthermore, since the first rubber portion of the elastic partition membrane is formed in a taper shape that becomes thinner toward the outer side in the radial direction, the action of the taper shape makes it easier to reciprocate the elastic partition membrane. Accordingly, it is possible to further reduce the dynamic spring characteristics of the spring characteristics when a relatively small amplitude vibration is input.
  According to the liquid-filled vibration isolator of the present invention, the first fixture is configured as a vehicle body frame side coupling means coupled to the vehicle body frame side, and the second fixture is coupled to the vibration generator side. Since it is configured as the generator-side coupling means, a part of the vibration transmission path from the partitioning means (the elastic partition film and the holding member) to the vehicle body frame can be configured by the vibration isolation base.
  As a result, for example, even if the clamping member vibrates due to the contact between the elastic partition film (first rubber portion) and the clamping member (first stopper surface), the vibration is transmitted to the vehicle body frame. In addition, the vibration insulation effect of the vibration isolating base constituting a part of the vibration transmission path can be surely suppressed and the occurrence of abnormal noise can be sufficiently reduced.
  Moreover, since each of the pair of holding members is made of a resin material, there is an effect that the weight of the partitioning unit can be significantly reduced as compared with a case where the pair of holding members are made of a metal material.
  And since it comprised so that the mutual joining surface of these pair of clamping members might be welded by a welding means, for example, compared with the case where the member comprised from the metal material is integrated by a caulking means or a welding means, manufacturing equipment Therefore, there is an effect that it can be integrated more quickly and at low cost.
  In addition, the configuration integrated by the press-fitting means requires precise management of the dimensional tolerance of the press-fitting portion, and the management cost increases.If the configuration is integrated by the welding means as in the present invention, the management cost is reduced. There is an effect that reduction can be achieved.
  Further, the pair of sandwiching members are provided with a projecting portion and a recessed portion on their joint surfaces, and are configured to be fitted together in the axial direction of the partitioning means. When welding is performed by the welding means, the welding operation can be performed in a state where the clamping member is temporarily fixed, and the working efficiency can be improved. In addition, since the pair of clamping members can be relatively positioned in the radial direction by fitting in the axial direction, there is an effect that the positioning operation in the radial direction when performing the welding operation can be omitted. is there.
  Further, since the convex portion and the concave portion are configured such that the top portion of the convex portion and the bottom portion of the concave portion can come into contact with each other, the position of the contact surface between the top portion and the bottom portion can be set to The projecting height (the recessed depth of the recessed portion) can be brought closer to the one end surface of the clamping member. Therefore, since the distance between the contact surface between the top and bottom and the vibration transmitter (horn) of the ultrasonic welding means and the laser irradiator of the laser welding means can be reduced, vibration and heat from the welding means can be reduced. Can be efficiently transmitted to the contact surface, and the contact surface can be more reliably welded accordingly.
  According to the liquid-filled vibration isolator according to claim 2, in addition to the effect exhibited by the liquid-filled vibration isolator according to claim 1, the first stopper surface is disposed in the radial direction of the partition means. Since the end on the side is curved in an arc shape in cross section, the action of the arc shape in cross section facilitates the reciprocating displacement of the elastic partition film, and relatively small amplitude vibration is input. In this case, the durability of the elastic partition membrane as a whole is improved by suppressing the wear and damage of the first rubber portion due to contact with the end portion of the first stopper surface while improving the low dynamic spring characteristics. There is an effect that can be.
  According to the liquid-filled vibration isolator according to claim 3, in addition to the effect exerted by the liquid-filled vibration isolator according to claim 1 or 2, in the substantially central portion of the elastic partition film Since the opening is formed and only the peripheral edge of the thin plate member is embedded in the elastic partition membrane, the amount of rubber-like elastic body used is reduced by the opening of the opening, and accordingly, There is an effect that the material cost can be reduced.
  Such a reduction in the amount of rubber-like elastic material that cannot be used in conventional elastic partition membranes (that is, reducing the film thickness leads to a decrease in damping characteristics due to a decrease in membrane rigidity, while rubber When the hardness is increased and the rigidity is increased, a low dynamic spring characteristic cannot be obtained.) As in the present invention, the thin plate member is embedded in the elastic partition film for the first time. Thereby, reduction of material cost and weight reduction and securing of dynamic characteristics (low dynamic spring characteristics and high damping characteristics) can be achieved at the same time.
  In addition, by providing the opening at the substantially central portion of the elastic partition membrane as described above, there is an effect that the opening area of the opening can be changed and the rigidity of the entire elastic partition membrane can be appropriately adjusted. . As a result, there is an effect that tuning for obtaining desired dynamic characteristics (for example, high damping characteristics and low dynamic spring characteristics) can be facilitated, and the tuning cost can be reduced.
  According to the liquid-filled vibration isolator according to claim 4, in addition to the effect produced by the liquid-filled vibration isolator according to any one of claims 1 to 3, the assembled state of the partition means , The second stopper surface portion of the pair of clamping members presses the second rubber portion of the elastic partition membrane in the axial direction of the partition means so that pre-compression is applied to the second rubber portion of the elastic partition membrane. Since the second rubber portion is filled between the second stopper surface portions, it is possible to suppress the occurrence of a gap between the second stopper surface portion and the second rubber portion.
  As a result, since it is possible to suppress the occurrence of air accumulation, it is possible to avoid adverse effects on dynamic characteristics (for example, a decrease in attenuation characteristics), and after integrating the partition means outside the liquid tank, Since the partitioning means can be inserted into the cylindrical body of the second fixture in the liquid tank to assemble a liquid-filled vibration isolator, a plurality of parts are inserted into the second fixture in the liquid tank. In comparison, the assembling property can be improved.
  The scope of the claimsItem 5According to the liquid-filled vibration isolator unit described above, the second mounting tool is provided with the step portion, and the contact portion is provided on the inner peripheral portion of the vibration generator-side bracket. In the case of internal press-fitting to the inner peripheral part, there is an effect that positioning in the press-fitting direction can be performed by bringing the step part into contact with the contact part. Further, when a load in the press-fitting direction is applied to the second fixture with the input of a large amplitude vibration, the stepped portion comes into contact with the contact portion, so that the second fixture is on the vibration generator side. There is an effect that it is possible to avoid detaching from the inner peripheral portion of the bracket.
  The scope of the claimsItem 6According to the liquid-filled vibration isolator unit described in claimItem 5In addition to the effects exhibited by the liquid-filled vibration isolator unit described above, the second mounting tool is configured so that the large-diameter cylindrical portion is positioned closer to the first mounting tool than the small-diameter cylindrical portion. When the inner fitting portion of the vibration generator side bracket is press-fitted, the stepped portion of the second fixture is configured to be positioned closer to the first fixture than the contact portion of the vibration generator side bracket. There is an effect that it is possible to more reliably avoid the second fixture from coming off from the inner peripheral portion of the vibration generator side bracket.
  That is, according to the above configuration, when the vibration generator side bracket is displaced in the shared load direction after the vibration generator is supported and fixed (that is, when the second fixture is displaced toward the first fixture). Further, since the elastic recovery force of the vibration-damping base member subjected to compression deformation acts as a force that hinders the movement of the second fixture, the second fixture can be easily detached from the inner periphery of the vibration generator side bracket. According to the liquid-filled vibration isolator unit described in the item, the stepped portion of the second fixture comes into contact with the contact portion of the vibration generator-side bracket, so that the above-described disconnection can be avoided.
  When the vibration generator side bracket is displaced in the direction opposite to the shared load (that is, when the second fixture is displaced in a direction away from the first fixture), the elastic recovery force of the vibration-damping base member that has been compressively deformed is used. Acts as a force for assisting the movement of the second fixture, and the second fixture is difficult to be removed from the inner peripheral portion of the vibration generator-side bracket, so that the means for preventing the removal is not necessary.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing a usage state of a liquid-filled vibration isolator according to a first embodiment of the present invention, where (a) is a top view and (b) is an arrow Ib in FIG. 1 (a). It is the side view seen from the direction.
FIG. 2 is a cross-sectional view of the liquid-filled vibration isolator taken along line II-II in FIG.
3A is a top view of the elastic partition membrane, and FIG. 3B is a cross-sectional view of the elastic partition membrane taken along line IIIb-IIIb in FIG. 3A.
4A is a top view of the upper clamping member, and FIG. 4B is a cross-sectional view of the upper clamping member taken along line IVb-IVb in FIG. 4A.
5A is a top view of the lower holding member, and FIG. 5B is a cross-sectional view of the lower holding member taken along the line Vb-Vb in FIG. 5A.
6A is a top view of the partition unit, and FIG. 6B is a cross-sectional view of the partition unit along line VIb-VIb in FIG. 6A.
FIG. 7 is a partially enlarged cross-sectional view of a partition means.
FIG. 8 is a cross-sectional view of a liquid filled type vibration damping device according to a second embodiment.
FIG. 9 is a cross-sectional view of a liquid filled type vibration damping device according to a third embodiment.
FIG. 10A is an exploded cross-sectional view of the partition unit, and FIG. 10B is a cross-sectional view of the partition unit.
[Explanation of symbols]
100,200 Liquid-filled vibration isolator (part of liquid-filled vibration isolator unit)
1 1st mounting bracket (1st mounting tool, body frame side connection means)
2 Second mounting bracket (second mounting bracket, vibration generator side coupling means)
2a Large diameter cylinder
2b Small diameter cylinder
3 Anti-vibration substrate
5 Diaphragm
6 Liquid enclosure
6A 1st liquid chamber
6B Second liquid chamber
20 Orifice
7, 17 Partition means
8 Elastic partition membrane (part of partitioning means)
8a opening
8c 1st rubber part
8d Second rubber part
81 Thin plate member (part of partitioning means)
9, 19 Upper clamping member (clamping member, part of partitioning means)
10,110 Lower holding member (holding member, part of partitioning means)
9a, 10a First stopper surface
9b, 10b Second stopper surface
19e Projection
19e1 top
110e recessed part
110e1 bottom
EG engine (vibration generator)
BF body frame
B2, B12 Engine side bracket (vibration generator side bracket, part of liquid-filled vibration isolator unit)
B12b contact part (contact part of vibration generator side bracket)
BEST MODE FOR CARRYING OUT THE INVENTION
  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the accompanying drawings. 1A and 1B are schematic views showing a usage state of the liquid-filled vibration isolator 100 according to the first embodiment of the present invention. FIG. 1A is a top view and FIG. 1B is a plan view of FIG. It is the side view seen from the arrow Ib direction.
  The liquid-filled vibration isolator 100 is a vibration isolator for supporting and fixing a vehicle engine EG so that vibration of the engine EG is not transmitted to the vehicle body frame BF. As shown in FIG. It is connected to the vehicle body frame BF via the frame side bracket B1, and is connected to the engine EG via the engine side bracket B2.
  The vehicle body frame side bracket B1 is fastened and fixed to the vehicle body frame BF by bolts (not shown) inserted through the attachment holes B1a, and the engine side bracket B2 is bolts (not shown) inserted through the attachment holes B2a. Is fastened and fixed to the engine side member EG1. Accordingly, a shared load acts on the liquid-filled vibration isolator 100 that supports and fixes the engine EG in the downward direction of FIG.
  FIG. 2 is a cross-sectional view of the liquid-filled vibration isolator 100 taken along the line II-II in FIG. In FIG. 2, the first mounting bracket 1 is not shown in cross section. Further, the center line indicated by a one-dot chain line in FIG. 2 indicates the axis O of the liquid-filled vibration isolator 100.
  As shown in FIG. 2, the liquid-filled vibration isolator 100 includes a first mounting bracket 1 attached to the vehicle body frame BF (see FIG. 1B) via the vehicle body frame side bracket B1, and an engine side bracket B2. A cylindrical second mounting bracket 2 that is attached to the engine EG (see FIG. 1B) side through the base, and a vibration-isolating base 3 that is composed of a rubber-like elastic body and connects them. Yes.
  As shown in FIG. 2, the first mounting bracket 1 is formed of an aluminum alloy or the like and has a substantially conical truncated conical shape that is symmetrical about the axis, and is fastened and fixed to the vehicle body frame B <b> 1 at its lower end surface. An internal female thread portion 11 is recessed upward. Further, on the side of the female thread portion 11, a positioning pin 12 that fits into the concave portion of the body frame side bracket B1 is projected.
  As shown in FIG. 2, the second mounting bracket 2 is formed in a cylindrical shape having upper and lower ends (upper and lower sides in FIG. 2) opened from a steel material. The second mounting bracket 2 is configured to have a step, the lower side of the step (lower side in FIG. 2) is a large-diameter cylindrical portion 2a, and the upper side of the step (upper side in FIG. 2) is a small-diameter cylinder. Part 2b. As shown in FIG. 2, the second mounting bracket 2 has a large-diameter cylindrical portion 2a fitted into the inner peripheral portion of the engine side bracket B2.
  As shown in FIG. 2, the anti-vibration base 3 is formed from a rubber-like elastic body in a substantially truncated conical shape with a constriction that is symmetrical about the axis, and the upper end surface and the side surface of the first mounting bracket 1 and the second The mounting bracket 2 is vulcanized and bonded between the lower end side (mainly the large diameter cylindrical portion 2a) and the inner peripheral portion.
  Thus, according to the liquid-filled vibration isolator 100 of the present embodiment, the first mounting bracket 1 is configured as the vehicle body frame side coupling means coupled to the vehicle body frame BF side, and the second mounting bracket 2 is Since it is configured as a vibration generator-side coupling unit that is coupled to the engine EG (vibration generator) side, a part of a vibration transmission path from a partition unit 7 to a vehicle body frame BF, which will be described later, is configured by the vibration isolation base 3.
  As a result, even if, for example, in the partition means 7, the elastic partition film 8 collides with the upper or lower holding members 9, 10, and the upper or lower holding members 9, 10 vibrate, the vibrations are applied to the vehicle body frame. Transmission to the BF can be reliably suppressed by the vibration insulation effect of the vibration-proof base 3 that constitutes a part of the vibration transmission path, and the generation of abnormal noise can be greatly reduced.
  As shown in FIG. 2, a rubber film 31 covering the inner peripheral surface of the second mounting bracket 2 (mainly the small diameter cylindrical portion 2 b) is connected to the upper end portion (upper side of FIG. 2) of the vibration isolation base 3. The rubber film 31 is in close contact with projecting walls 9d and 10d (see FIGS. 4 and 5) of upper and lower clamping members 9 and 10, which will be described later, and a mounting bracket 51 of the diaphragm 5.
  As shown in FIG. 2, the diaphragm 5 is formed from a rubber-like elastic body into a rubber film shape having a partial spherical shape, and an upper end portion (upper side in FIG. 2) of the second mounting bracket 2 (small diameter cylindrical portion 2 b). Has been attached to. As a result, a liquid sealing chamber 6 is formed between the lower surface side of the diaphragm 5 and the upper surface side of the vibration isolating base 3.
  The liquid enclosure 6 is filled with an antifreeze liquid (not shown) such as ethylene glycol. Further, as shown in FIG. 2, the liquid sealing chamber 6 is divided into a first part on the side of the anti-vibration base 3 (the lower side in FIG. 2) by the partition means 7 (the elastic partition film 8 and the upper and lower holding members 9 and 10). The chamber is divided into two chambers, a liquid chamber 6A and a second liquid chamber 6B on the diaphragm 5 side (upper side in FIG. 2).
  The diaphragm 5 is vulcanized and bonded to a donut-shaped mounting bracket 51 as viewed from above. As shown in FIG. 2, the upper end portion (upper side in FIG. 2) of the second mounting bracket 2 is interposed via the mounting bracket 51. Has been attached to.
  As described above, the partition means 7 partitions the liquid sealing chamber 6 into the first liquid chamber 6A and the second liquid chamber 6B, and is an elastic partition film 8 configured in a substantially disc shape from a rubber-like elastic material. And upper and lower clamping members 9 and 10 for clamping and fixing the elastic partition film 8 in the axial direction.
  On the outer peripheral side of the partition means 7 (upper and lower clamping members 9, 10), as shown in FIG. 2, an orifice 20 is formed between the inner peripheral side (rubber film 31) of the second mounting bracket 2. ing. The orifice 20 is an orifice channel that allows the first liquid chamber 6A and the second liquid chamber 6B to communicate with each other.
  The orifice 20 communicates with the second liquid chamber 6B through a notch 9d1 formed in the overhanging wall 9d of the upper holding member 9 (see FIG. 4), while the lower holding member 10 It communicates with the first liquid chamber 6A via a notch 10d1 formed in the overhanging wall 10d (see FIG. 5).
  Here, the assembly of the liquid-filled vibration isolator 100 is performed by first fitting the partition means 7 and the diaphragm 5 in order from the upper end side (upper side in FIG. 2) of the second mounting bracket 2, and then the second mounting bracket 2. Is performed by reducing (drawing) the entire small-diameter cylindrical portion 2b in the radial direction (left-right direction in FIG. 2). Note that the upper end (upper side in FIG. 2) of the small-diameter cylindrical portion 2b is bent inward in the radial direction over the entire circumference.
  As a result, as shown in FIG. 2, the partition means 7 (upper and lower clamping members 9 and 10) is liquid-filled type anti-proof between the partition means receiving portion 32 provided on the vibration-proof base 3 and the diaphragm 5. The vibration device 100 is clamped and fixed in the axial direction (vertical direction in FIG. 2). The partition means receiving portion 32 is formed as a step portion at a plurality of locations (or the entire circumference) on the upper surface side of the vibration isolating base 3, and the lower end surface of the partition means 7 (lower holding member 10) by the step portion. Receive (bottom side of Fig. 2).
  In this assembled state, the partition means receiving portion 32 is compressed and deformed, and the elastic restoring force of the partition means receiving portion 32 is applied to the lower end surface of the partition means 7 as the holding force of the partition means 7. Thereby, even when a large amplitude or a high frequency amplitude is inputted, the partition means 7 is firmly and stably held and fixed, and the dynamics caused by the positional deviation or resonance of the members 8, 9, 10, etc. The influence on the characteristic can be avoided.
  Next, with reference to FIGS. 3 to 7, the members 8, 9, and 10 constituting the partition unit 7 will be described sequentially. In the description of the members 8, 9, and 10, the top view of the partitioning means 7 and the cross-sectional views of FIGS. Moreover, the center line shown with the dashed-dotted line in each figure shows the axial center O of each member 8,9,10.
  First, the elastic partition film 8 will be described with reference to FIG. 3A is a top view of the elastic partition film 8, and FIG. 3B is a cross-sectional view of the elastic partition film 8 taken along the line IIIb-IIIb in FIG. 3A.
  As shown in FIG. 3, the elastic partition film 8 is formed in a substantially disk shape from a rubber-like elastic body, and a thin plate member 81 formed in a substantially thin plate shape from a metal material is disposed in the axis O direction ( FIG. 3B is embedded in a substantially middle portion. The thin plate member 81 is configured in a substantially disc shape concentric with the elastic partition film 8.
  As shown in FIG. 3A, an opening 8a having a substantially circular shape when viewed in the direction of the axis O is formed on both surfaces at the substantially central portion of the elastic partition film 8, and the thin plate member 81 is formed as shown in FIG. As shown in (b), only the peripheral edge is embedded in the elastic partition film 8. Further, the outermost peripheral edge of the thin plate member 13 is located at a boundary portion between a first rubber portion 8c and a second rubber portion 8d described later.
  As shown in FIG. 3 (b), the elastic partition membrane 8 has a rubber film portion 8b formed to have a substantially constant thickness, and is positioned on the radially outer side of the rubber film portion 8b and at the radially outer side. The first rubber portion 8c is formed in a tapered shape that is thinner toward the outer side (that is, narrowed in the direction of the axis O (the vertical direction in FIG. 3B)), and radially outward from the first rubber portion 8c. And a second rubber part 8d formed higher than the rubber film part 8b and the first rubber part 8c by rising in the direction of the axis O. Both tip portions of the second rubber portion 8d are formed to be curved in a circular arc shape that is convex in the tip direction (upward or downward in FIG. 3B).
  The first and second rubber portions 8c and 8d of the elastic partition film 8 are pressed (sandwiched) in the axis O direction (the vertical direction in FIG. 2 (b)) by the upper and lower holding members 9 and 10. In the assembled state of the partitioning means 7, pre-compression in the direction of the axis O is applied to the first and second rubber portions 8c, 8d (see FIG. 6).
  Here, in the present embodiment, pre-compression is applied only to a part of the first rubber part 8c (a part on the radially outer side) (see FIG. 7), but the whole of the first rubber part 8c. You may set the film thickness of a 1st rubber part, and the height of 1st stopper surface part 9a, 10a so that precompression may be provided.
  In this way, by applying pre-compression to the first and second rubber portions 8c, 8d, it is possible to suppress the generation of a gap between the elastic partition film 8 and the upper and lower holding members 9, 10. Generation of air pockets (bubbles) can be avoided. As a result, adverse effects on dynamic characteristics can be avoided. Further, after assembling the partition means 7 (see FIG. 5) outside the liquid tank, the partition means 7 is inserted into the second fixture 2 inside the liquid tank, and the liquid-filled vibration isolator 100 (see FIG. 2). ) Can be assembled, and assemblability can be improved.
  Next, the upper clamping member 9 will be described with reference to FIG. 4A is a top view of the upper clamping member 9, and FIG. 4B is a cross-sectional view of the upper clamping member 9 taken along line IVb-IVb in FIG. 4A.
  The upper clamping member 9 is formed in a substantially cylindrical shape from a metal material such as an aluminum alloy, and is integrated with the lower clamping member 10 by press-fitting means. Thus, the partition means 7 is configured while sandwiching and fixing the peripheral portion of the elastic partition film 8 together with the lower sandwiching member 10 (see FIG. 6).
  As shown in FIG. 4 (b), the lower end of the upper clamping member 9 (lower side in FIG. 4 (b)) has a first stopper surface portion 9a that presses the first rubber portion 8c of the elastic partition film 8, and A second stopper surface portion 9b that is positioned radially outward from the first stopper surface portion 9a and that is recessed (recessed) from the first stopper surface portion 9a is formed over the entire circumference. Has been.
  In the present embodiment, both the radially inner and outer ends of the first stopper surface portion 9a are formed to be curved in a cross-sectional arc shape, while the second stopper surface portion 9b is formed in the radial direction. The end on the inner side is formed in an arc shape in cross section, and the end on the outer side in the radial direction is formed in a straight line (see FIG. 7). Thereby, the space for the elastic partition film 8 (2nd rubber | gum part 8d) to which precompression was provided to deform | transform is ensured.
  On the outer peripheral side of the upper clamping member 9, as shown in FIG. 4B, a press-fitting surface portion 9c and an overhanging wall 9d are provided over the entire circumference.
  The press-fitting surface portion 9c is a portion into which the press-fitting surface portion 10c (see FIG. 5) of the lower holding member 10 is externally fitted and is continuously provided to the second stopper surface portion 9b. On the other hand, the projecting wall 9d is an orifice forming wall for forming the orifice 20 (see FIG. 1), and is formed so as to project outward in the radial direction.
  In addition, as shown in FIG. 4A, a substantially U-shaped notch 9d1 in a top view is formed in a part of the protruding wall 9d in the circumferential direction. This notch 9d1 is an orifice inlet / outlet for communicating the orifice 20 with the second liquid chamber 6B (see FIG. 1).
  Next, the lower clamping member 10 will be described with reference to FIG. FIG. 5A is a top view of the lower holding member 10, and FIG. 5B is a cross-sectional view of the lower holding member 10 taken along the line Vb-Vb in FIG. 5A.
  The lower clamping member 10 is formed in a substantially cylindrical shape from a metal material such as an aluminum alloy, and is integrated with the upper clamping member 9 described above by press-fitting means. Thus, as described above, the partitioning means 7 is configured while sandwiching and fixing the peripheral portion of the elastic partition film 8 together with the upper sandwiching member 9 (see FIG. 6).
  As shown in FIG. 5 (b), an overhanging portion is formed on the lower end on the inner peripheral side of the lower holding member 10 (lower side in FIG. 5 (b)), and this overhang is formed in the radially inward direction. The portion includes a first stopper surface portion 10a that presses the first rubber portion 8c of the elastic partition film 8, and is positioned radially outward from the first stopper surface portion 10a, and more than the first stopper surface portion 10a. A second stopper surface portion 10b formed (recessed) by retreating in the axial direction is formed over the entire circumference.
  In the present embodiment, both the radially inner and outer ends of the first and second stopper surface portions 10a, 10b are curved in a circular arc shape (see FIG. 7). .
  As shown in FIG. 5, the lower clamping member 10 has a press-fitting surface portion 10c on the inner peripheral side thereof, and an overhanging wall 9d on the outer peripheral side.
  As described above, the press-fit surface portion 10c is a portion that is externally press-fitted into the press-fit surface portion 9c (see FIG. 4) of the upper clamping member 9, and is continuous with the second stopper surface portion 10b. On the other hand, the overhanging wall 10d is an orifice forming wall for forming the orifice 20 (see FIG. 1) together with the above-described overhanging wall 9d, and is formed to protrude radially outward.
  As shown in FIG. 5A, a substantially U-shaped notch 10d1 in a top view is formed in a part of the protruding wall 10d in the circumferential direction. The notch 10d1 is an orifice entrance for communicating the orifice 20 with the first liquid chamber 6A.
  In addition, a vertical wall 10 e is erected on a part of the outer circumferential portion of the lower clamping member 10 in the circumferential direction. The vertical wall 10e is a wall portion for dividing the orifice 20 (see FIG. 1) in the circumferential direction. The partition means 7 is configured to cut the upper and lower clamping members 9 and 10 in the circumferential direction. It is assembled so as to be positioned between the notches 9d1 and 10d1 (see FIG. 6).
  Next, the partition means 7 is demonstrated with reference to FIG.6 and FIG.7. 6A is a top view of the partition unit 7, and FIG. 6B is a cross-sectional view of the partition unit 7 taken along the line VIb-VIb in FIG. 6A. FIG. 7 is a partially enlarged sectional view of the partition means 7.
  The partition means 7 is assembled outside the liquid tank. First, the elastic partition film 8 is clamped from both sides in the axis O direction by the upper and lower clamping members 9 and 10. Next, the upper clamping member 9 is further pushed in the direction of the axis O toward the lower clamping member 10, so that the press-fitting surface portion 10 c of the lower clamping member 10 is externally press-fitted into the press-fitting surface portion 9 c of the upper clamping member 9. Thereby, as shown in FIG. 6, the partition means 7 is integrally comprised by the some members 8-10.
  The integrated partitioning means 7 is immersed in the liquid tank and inserted into the second mounting bracket 2 in the liquid tank.
  In this case, the first and second rubber portions 8c and 8d of the elastic partition film 8 are provided in the direction of the axis O by the first and second stopper surface portions 9a, 9b, 10a and 10b of the upper and lower clamping members 9 and 10. The pre-compression is applied by the pressing force applied to the. As a result, as shown in FIG. 7, the first and second rubber portions 13c and 13d are filled in a space surrounded by the first and second stopper surface portions 14a to 15b. However, as described above, the first rubber portion 8c is pre-compressed only at a part thereof (outward in the radial direction).
  Further, in the assembled state of the partition means 7, as shown in FIGS. 6 and 7, the outer peripheral edge of the thin plate member 81 is radially outer than the radially inner end surfaces of the upper and lower clamping members 9 and 10. It is comprised so that it may be located in the side. Therefore, when the partition means 7 is viewed in the axial direction, the outer peripheral edge of the thin plate member 13 overlaps with the upper and lower holding members 9 and 10.
  Further, as shown in FIG. 7, a gap is formed between the first rubber portion 8c and the first stopper surface portions 9a and 10a on the radially inner side (right side in FIG. 7). This facilitates reciprocal deformation of the elastic partition film 8 and improves the low dynamic spring characteristics when relatively small amplitude vibration is input.
  Although providing the gap in this way is effective for securing the low dynamic spring characteristics, the elastic partition film 8 that reciprocally moves and collides with the first stopper surface portions 9a and 10a, which causes abnormal noise. There is a problem that. However, in the present invention, since a part of the vibration transmission path from the partition means 7 to the vehicle body frame BF is constituted by the vibration isolation base 3 (see FIGS. 1 and 2), the vibration caused by the collision is transmitted to the vehicle body frame BF. The transmission can be reliably suppressed by the vibration insulating effect of the vibration-proof base 3, and the generation of abnormal noise can be greatly reduced.
  Next, a second embodiment will be described with reference to FIG. In the first embodiment, the inner peripheral portion of the engine side bracket B2 is formed in a linear cross section, but the engine side bracket B12 of the second embodiment has a contact portion B12b formed on the inner peripheral portion thereof. . In addition, the same code | symbol is attached | subjected to the part same as 1st Embodiment mentioned above, and the description is abbreviate | omitted.
  FIG. 8 is a cross-sectional view of the liquid-filled vibration isolator 100 and corresponds to the cross-sectional view taken along the line II-II in FIG. As shown in FIG. 8, a contact portion B12b is formed on the inner peripheral portion of the engine side bracket B12 so as to protrude radially inward. Therefore, when the second mounting bracket 2 is press-fitted into the inner peripheral portion of the engine side bracket B12, positioning in the press-fitting direction can be performed by bringing the stepped portion into contact with the contact portion B12b.
  Further, in the second mounting bracket 2, the large-diameter cylindrical portion 2a is positioned closer to the first mounting bracket 1 than the small-diameter cylindrical portion 2b, and the stepped portion of the second mounting bracket 2 is in the internally fitted press-fitted state shown in FIG. Is configured to be located closer to the first mounting bracket 1 than the contact portion B12b of the engine side bracket B12. As a result, the second mounting bracket 2 can be more reliably avoided from coming off from the inner peripheral portion of the engine side bracket B12.
  Next, a third embodiment will be described with reference to FIGS. 9 and 10. In the first embodiment, the case where the upper and lower holding members 9 and 10 are integrated by press-fitting means has been described. However, the upper and lower holding members 19 and 110 of the second embodiment are formed by welding means. Integrated. In addition, the same code | symbol is attached | subjected to the part same as 1st Embodiment mentioned above, and the description is abbreviate | omitted.
  FIG. 9 is a cross-sectional view of the liquid-filled vibration isolator 200 and corresponds to the cross-sectional view taken along the line II-II in FIG. FIG. 10A is an exploded cross-sectional view of the partition unit 17, and FIG. 10B is a cross-sectional view of the partition unit 17.
  The upper and lower clamping members 19 and 110 in the third embodiment are formed in a substantially annular shape having an axis O from a thermoplastic resin material, and as shown in FIG. The joint surfaces are welded to each other by the welding means in a state where the portion is sandwiched. Thereby, it is integrated and the partition means 17 is comprised (refer FIG.10 (b)).
  Here, as shown in FIG. 10A, the upper clamping member 19 is provided with a projecting portion 19e on the outer side in the radial direction of the second stopper surface portion 9b so as to project over the entire circumference. The concave portion 110e is provided over the entire circumference on the radially outer side of the second stopper surface portion 10b.
  The projecting portion 19e and the recessed portion 110e are configured to be fitted in the axial direction, and the contact surfaces (the outer surface of the projecting portion 19e and the inner surface of the recessed portion 110e) are welded. It is a joining surface to be welded.
  In the assembled state of the partitioning means 7, as shown in FIG. 10 (b), the convex portion 19e protrudes so that the top portion 19e1 of the convex portion 19e and the bottom portion 110e1 of the concave portion 110e come into contact with each other. The installation height and the recessed depth of the recessed portion 110e are set, and the contact portions (the bottom portion 14e1 and the top portion 15c1) are mainly welded by the welding means.
  Here, examples of the welding means include known techniques such as an ultrasonic welding method and a laser welding method. In the ultrasonic welding method, pressure and ultrasonic vibration are applied to the joint surfaces of the upper and lower holding members 19 and 110 (that is, the top 19e1 of the projecting portion 19e and the bottom 110e1 of the recessed portion 110e), and the frictional heat thereof. By this, the resin material on the joint surface is melted and joined.
  In the laser welding method, the upper holding member 19 is made of a light-transmitting thermoplastic resin material, while the lower holding member 110 is made of a light-absorbing thermoplastic resin material, so The top part 19e1 of the projecting part 19e and the bottom part 110e1) of the concave part 110e) are irradiated with the laser beam focused on the vicinity of the boundary while applying pressure to the top part 10e1 of the convex part 19e (light absorbing resin material). , And the heat is transmitted to the bottom 110e1 of the recessed portion 110e to melt and bond the bonding surfaces.
  In addition, the welding by the said welding means of the joining surface may be performed partially in the circumferential direction (for example, four locations at intervals of 90 ° in the circumferential direction) or performed all around the circumferential direction. It may be. If it is performed partially, the welding cost can be reduced. On the other hand, if it is performed all around, the reliability of the bonding strength can be ensured.
  The present invention has been described above based on the embodiments, but the present invention is not limited to the above embodiments, and various improvements and modifications can be made without departing from the spirit of the present invention. It can be easily guessed.
  For example, in each of the above embodiments, the liquid-filled vibration isolator 100, 200 provided between the engine EG of the automobile and the body frame BF has been described as an application target of the present invention. However, the present invention is not limited to this. Of course, the present invention can be applied to other liquid-sealed vibration isolator. For example, the present invention may be applied to a liquid-filled vibration isolator provided between a transmission (vibration generator) and a body frame.
  In each of the above embodiments, the case where the large-diameter cylindrical portion 2a of the second mounting bracket 2 is press-fitted into the inner peripheral portion of the engine-side bracket B2 has been described. However, the present invention is not necessarily limited to this. 2 You may comprise so that the small diameter cylinder part 2b of the attachment metal fitting 2 may be press-fitted in the inner peripheral part of engine side bracket B2.
  In this configuration, the stepped portion of the second mounting bracket 2 can be brought into contact with the opening of the engine side bracket B2, so that the inner portion is provided in the same manner as in the case of providing the above-described contact portion B12b. Positioning at the time of press-fitting and an effect of preventing the press-fitting portion from coming off can be obtained.
  In the third embodiment, the liquid-filled vibration isolator 200 is mounted on the engine-side bracket B2 having an inner peripheral portion formed in a straight line, like the liquid-filled vibration isolator 100 in the first embodiment. Although the case where it is press-fitted has been described, the present invention is not necessarily limited to this, and as in the case of the second embodiment, the liquid-filled vibration isolator 200 is press-fitted into the engine-side bracket B12 having the contact portion B12b. Of course, it is possible to configure.
  Although not described in the above embodiments, the inner peripheral surface of the vehicle body frame side bracket B1 (the inner peripheral surface of the storage space for the liquid-filled vibration isolator 100, 200) and the outer peripheral surface of the engine side bracket B2 In addition, each rubber-like elastic body may be attached by vulcanization adhesion or the like to enable displacement regulation, so that a stopper action when a large displacement is input may be obtained.

Claims (6)

第１取付け具と、筒状の第２取付け具と、その第２取付け具と前記第１取付け具とを連結し、ゴム状弾性材から構成される防振基体と、前記第２取付け具に取付けられて前記防振基体との間に液体封入室を形成するダイヤフラムと、前記液体封入室を前記防振基体側の第１液室と前記ダイヤフラム側の第２液室とに仕切る仕切り手段と、その仕切り手段の外周面と前記第２取付け具の内周面との間に形成され、前記第１液室と第２液室とを連通させるオリフィスとを備える液封入式防振装置において、
前記仕切り手段は、ゴム状弾性材から構成される弾性仕切り膜と、その弾性仕切り膜内に埋設され金属材料から略薄板状に構成される薄板部材と、前記弾性仕切り膜をその軸心方向で挟持固定する挟持部材とを備え、
前記弾性仕切り膜は、その径方向外方側ほど薄肉のテーパー状に構成される第１ゴム部と、その第１ゴム部よりも径方向外方側に位置すると共に軸心方向に立ち上がる第２ゴム部とを備え、
前記一対の挟持部材は、前記弾性仕切り膜の第１ゴム部を受け止め可能な第１ストッパ面部と、その第１ストッパ面部よりも軸心方向に後退して位置すると共に前記弾性仕切り膜の第２ゴム部を受け止め可能な第２ストッパ面部とを備え、
前記薄板部材は、その外周縁が前記一対の挟持部材の径方向内方側の端面よりも径方向外方側に位置し、
前記第１取付け具を車体フレーム側に連結される車体フレーム側連結手段として構成すると共に、前記第２取付け具を振動発生体側に連結される振動発生体側連結手段として構成することで、前記仕切り手段から前記車体フレームまでの振動伝達経路の一部が前記防振基体によって構成され、
前記一対の挟持部材を熱可塑性の樹脂材料から構成し、互いの接合面を溶着手段により溶着することで、前記仕切り手段が一体的に構成されると共に、
前記一対の挟持部材は、一方の接合面から突設される凸設部と、他方の接合面に凹設され前記凸設部を受け入れ可能な凹設部とを備え、前記仕切り手段の軸心方向で嵌合可能に構成されると共に、それら凸設部と凹設部とは、前記仕切り手段の組み立て状態において、前記凸設部の頂部と前記凹設部の底部とが当接するように凸設高さと凹設深さとがそれぞれ設定されていることを特徴とする液封入式防振装置。A first mounting tool, a cylindrical second mounting tool, the second mounting tool and the first mounting tool connected to each other, and a vibration isolating base made of a rubber-like elastic material; and the second mounting tool. A diaphragm which is attached to form a liquid sealing chamber between the vibration isolating substrate and partition means for partitioning the liquid sealing chamber into a first liquid chamber on the vibration isolating substrate side and a second liquid chamber on the diaphragm side; In the liquid-filled vibration isolator comprising an orifice formed between the outer peripheral surface of the partition means and the inner peripheral surface of the second fixture, and communicating with the first liquid chamber and the second liquid chamber,
The partition means includes an elastic partition film composed of a rubber-like elastic material, a thin plate member embedded in the elastic partition film and configured in a substantially thin plate shape, and the elastic partition film in the axial direction. A clamping member for clamping and fixing,
The elastic partition membrane has a first rubber portion configured to have a taper shape that is thinner toward a radially outer side thereof, and a second rubber member that is positioned on a radially outer side than the first rubber portion and rises in an axial direction. With a rubber part,
The pair of clamping members are positioned at a first stopper surface portion capable of receiving the first rubber portion of the elastic partition membrane, and retracted in the axial direction from the first stopper surface portion, and the second of the elastic partition membrane. A second stopper surface portion capable of receiving the rubber portion;
The outer peripheral edge of the thin plate member is positioned on the radially outer side from the end surfaces on the radially inner side of the pair of clamping members,
The partition unit is configured by configuring the first mounting member as a vehicle body frame side connecting unit connected to the vehicle body frame side and configuring the second mounting unit as a vibration generator side connecting unit connected to the vibration generating unit side. A part of a vibration transmission path from the vehicle body frame to the vehicle body frame is constituted by the vibration isolation base ,
The pair of sandwiching members are made of a thermoplastic resin material, and the partitioning unit is integrally configured by welding the joint surfaces to each other by a welding unit.
The pair of clamping members includes a projecting portion projecting from one joining surface and a recessed portion recessed on the other joining surface and capable of receiving the projecting portion, and an axis of the partition means The projecting portion and the recessed portion are configured so that they can be fitted in the direction, and the projecting portion and the recessed portion are projected so that the top portion of the projecting portion comes into contact with the bottom portion of the recessed portion in the assembled state of the partition means. A liquid-filled vibration isolator having a set height and a recessed depth, respectively . 前記一対の挟持部材の第１ストッパ面部は、前記仕切り手段の径方向内方側の端部が断面円弧状に湾曲して形成されていることを特徴とする請求の範囲第１項記載の液封入式防振装置。  2. The liquid according to claim 1, wherein the first stopper surface portions of the pair of clamping members are formed such that the radially inner end portions of the partition means are curved in a circular arc shape in cross section. Enclosed vibration isolator. 前記弾性仕切り膜は、略中心部に開口部が開口形成されており、
前記薄板部材の周縁部のみが前記弾性仕切り膜内に埋設されるように構成されていることを特徴とする請求の範囲第１又は第２項に記載の液封入式防振装置。The elastic partition membrane has an opening formed substantially in the center,
The liquid-filled vibration isolator according to claim 1 or 2, wherein only the peripheral edge of the thin plate member is embedded in the elastic partition membrane. 前記仕切り手段の組み立て状態においては、前記一対の挟持部材の第２ストッパ面部が前記弾性仕切り膜の第２ゴム部を前記仕切り手段の軸心方向へ押圧することで、その弾性仕切り膜の第２ゴム部に予圧縮が付与されるように構成されていることを特徴とする請求の範囲第１から第３項のいずれかに記載の液封入式防振装置。  In the assembled state of the partition means, the second stopper surface portion of the pair of clamping members presses the second rubber portion of the elastic partition film in the axial direction of the partition means, so that the second of the elastic partition film is formed. The liquid-filled vibration isolator according to any one of claims 1 to 3, wherein pre-compression is applied to the rubber part. 請求の範囲第１から第４項のいずれかに記載の液封入式防振装置と、その液封入式防振装置を前記振動発生体側に連結する振動発生体側ブラケットとを備えた液封入式防振装置ユニットにおいて、
前記第２取付け具は、小径筒部と、その小径筒部よりも大径に形成される大径筒部と、その大径筒部と前記小径筒部とを連結する段差部とを備えると共に、前記大径筒部が前記振動発生体側ブラケットの内周部へ内嵌圧入されるものであり、
前記振動発生体側ブラケットの内周部には、その内周部に内嵌圧入された前記第２取付け具の段差部に当接可能な当接部が径方向内方側に張り出して形成されていることを特徴とする液封入式防振装置ユニット。A liquid-filled vibration-proof device comprising the liquid-filled vibration-proof device according to any one of claims 1 to 4 and a vibration generator-side bracket that connects the liquid-filled vibration-proof device to the vibration generator side. In the vibration unit,
The second fixture includes a small-diameter cylindrical portion, a large-diameter cylindrical portion formed larger in diameter than the small-diameter cylindrical portion, and a stepped portion connecting the large-diameter cylindrical portion and the small-diameter cylindrical portion. The large-diameter cylindrical portion is press-fitted into the inner peripheral portion of the vibration generator-side bracket,
On the inner peripheral portion of the vibration generator side bracket, an abutting portion capable of abutting on the stepped portion of the second fixture fitted and fitted into the inner peripheral portion is formed to project radially inward. A liquid-filled vibration isolator unit characterized by comprising: 前記第２取付け具は、前記大径筒部が前記小径筒部よりも前記第１取付け具側に位置すると共に、その大径筒部を前記振動発生体側ブラケットの内周部に内嵌圧入するものであり、
その内嵌圧入状態では、前記第２取付け具の段差部が前記振動発生体側ブラケットの当接部よりも前記第１取付け具側に位置するように構成されていることを特徴とする請求の範囲第５項記載の液封入式防振装置ユニット。In the second fixture, the large-diameter cylindrical portion is positioned closer to the first fixture than the small-diameter cylindrical portion, and the large-diameter cylindrical portion is press-fitted into an inner peripheral portion of the vibration generator-side bracket. Is,
The stepped portion of the second fixture is configured to be positioned closer to the first fixture than the contact portion of the vibration generator side bracket in the internally fitted press-fitted state. The liquid-filled vibration isolator unit according to claim 5 .
JP2005512257A 2004-11-17 2004-11-17 Liquid filled vibration isolator and liquid filled vibration isolator unit Expired - Fee Related JP4077007B2 (en)

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JP4718500B2 (en) * 2007-02-22 2011-07-06 東洋ゴム工業株式会社 Liquid-filled vibration isolator
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