JP5156489B2 - Vibration isolator - Google Patents

Vibration isolator Download PDF

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JP5156489B2
JP5156489B2 JP2008149905A JP2008149905A JP5156489B2 JP 5156489 B2 JP5156489 B2 JP 5156489B2 JP 2008149905 A JP2008149905 A JP 2008149905A JP 2008149905 A JP2008149905 A JP 2008149905A JP 5156489 B2 JP5156489 B2 JP 5156489B2
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peripheral surface
inner peripheral
outer peripheral
liquid chamber
vibration isolator
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JP2009293747A (en
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哲 植木
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Bridgestone Corp
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Bridgestone Corp
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Description

本発明は、例えば自動車のエンジン等の振動発生部を車体等の振動受部にマウントする際に用いられる防振装置に関する。   The present invention relates to a vibration isolator that is used when mounting a vibration generating unit such as an automobile engine on a vibration receiving unit such as a vehicle body.

この種の防振装置として、従来、振動発生部および振動受部のうちの何れか一方に連結されるブラケットと、このブラケットの筒状のホルダー部の内側に嵌合された筒部材と、振動発生部および振動受部のうちの何れか他方に連結される取付部材と、筒部材と取付部材とを弾性的に連結するとともに筒部材の一方の開口端を閉塞するゴム弾性体と、筒部材の他方の開口端を閉塞するダイヤフラムと、筒部材の内側に形成されて液体が封入された液室を主液室と副液室とに区画する仕切り部材と、を備えた構成が知られている。上記した主液室は、隔壁の一部がゴム弾性体で形成されてゴム弾性体の変形により内容積が変化する液室であり、上記した副液室は、隔壁の一部がダイヤフラムで形成された液室である。また、仕切り部材には、主液室と副液室とを連通するオリフィス通路が形成されている。また、上記した液室の内側には、変形可能なメンブランが配設されており、このメンブランによって、高周波領域の振動が入力された際に防振装置が硬くならないようにバネ低減を図ることができ、これにより、防振装置による振動減衰機能を維持することができる。   Conventionally, as this type of vibration isolator, a bracket connected to any one of a vibration generating portion and a vibration receiving portion, a cylindrical member fitted inside a cylindrical holder portion of the bracket, and a vibration A mounting member connected to one of the generator and the vibration receiving unit; a rubber elastic body that elastically connects the cylindrical member and the mounting member and closes one open end of the cylindrical member; and a cylindrical member There is known a configuration including a diaphragm that closes the other opening end of the first liquid crystal, and a partition member that is formed inside the cylindrical member and divides a liquid chamber filled with liquid into a main liquid chamber and a sub liquid chamber. Yes. The main liquid chamber described above is a liquid chamber in which a part of the partition wall is formed of a rubber elastic body and the internal volume changes due to the deformation of the rubber elastic body. The sub liquid chamber described above is formed of a part of the partition wall using a diaphragm. Liquid chamber. The partition member is formed with an orifice passage communicating the main liquid chamber and the sub liquid chamber. Further, a deformable membrane is disposed inside the liquid chamber, and this membrane can reduce the spring so that the vibration isolator does not become hard when vibrations in a high frequency region are input. Thus, the vibration damping function by the vibration isolator can be maintained.

上記した防振装置では、防振装置に大きなバウンド方向の振動が入力されて主液室の液圧が急激に上昇した後、リバウンド方向に振動が入力されて主液室が負圧になったとき、主液室側の液中に多数の気泡が生成されるキャビテーションが発生する場合がある。特に、オリフィス通路と主液室との連通部分において局所的に急激な液圧変動が起きるので、上記したキャビテーションは、上記連通部分に発生し易い。そこで、従来、例えば下記特許文献１に示されているように、筒部材において上記連通部分に隣接する部分に側面開口部が形成され、この側面開口部が高周波領域のバネ低減のためのメンブランで閉塞された構成の防振装置が提案されている。このメンブランの外側面と上記したブラケットのホルダー部の内周面との間には隙間があけられている。この防振装置では、上記連通部分において急激な液圧変動が生じようとしても、この液圧変動が上記メンブランによって緩和されるので、キャビテーションの発生を抑制することができる。
特開平１１−１０１２９６号公報 In the above-described vibration isolator, after a large bounce vibration is input to the vibration isolator and the main liquid chamber suddenly rises in pressure, vibration is input in the rebound direction and the main liquid chamber becomes negative pressure. In some cases, cavitation may occur in which a large number of bubbles are generated in the liquid on the main liquid chamber side. In particular, since sudden fluid pressure fluctuations locally occur in the communication portion between the orifice passage and the main liquid chamber, the above-described cavitation is likely to occur in the communication portion. Therefore, conventionally, for example, as shown in Patent Document 1 below, a side opening is formed in a portion adjacent to the communicating portion in the cylindrical member, and this side opening is a membrane for reducing a spring in a high frequency region. A vibration isolator having a closed configuration has been proposed. A gap is formed between the outer surface of the membrane and the inner peripheral surface of the bracket holder. In this vibration isolator, even if an abrupt fluid pressure fluctuation occurs in the communicating portion, the fluid pressure fluctuation is alleviated by the membrane, so that the occurrence of cavitation can be suppressed.
Japanese Patent Laid-Open No. 11-101296

しかしながら、上記した特許文献１に示されたような従来の防振装置では、ホルダー部の両端を筒部材にカシメ固定しているだけであり、カシメ部分の気密性が不十分であるため、メンブランの径方向外側の空間に外気が侵入し、メンブランがオゾン劣化するおそれがある。また、メンブランの径方向外側の空間を封止するために、筒部材の他方の開放端側の外周面にＯリング状のゴムシール部を加硫接着させて筒部材の外周面とホルダー部の内周面との間にゴムシール部を介在させる方法が考えられるが、ゴムの加硫成形後にゴム表面の仕上げ工程が必要であるのでコストアップになり、また、筒部材をブラケットに対して確実に同軸に嵌合させる必要があるので量産性が低くなるという問題が存在する。   However, in the conventional vibration isolator as shown in Patent Document 1 described above, both ends of the holder portion are only caulked and fixed to the cylindrical member, and the airtightness of the caulking portion is insufficient. There is a risk that outside air may enter the space on the outside in the radial direction and the membrane may be deteriorated by ozone. In addition, in order to seal the space on the outer side in the radial direction of the membrane, an O-ring-shaped rubber seal portion is vulcanized and bonded to the outer peripheral surface on the other open end side of the cylindrical member, so that the inner surface of the cylindrical member and the holder portion are Although a method of interposing a rubber seal part with the peripheral surface is conceivable, a rubber surface finishing process is required after rubber vulcanization molding, which increases the cost and ensures that the cylindrical member is coaxial with the bracket. Therefore, there is a problem that the mass productivity becomes low.

本発明は、上記した従来の問題が考慮されたものであり、筒部材の側面開口部を閉塞するメンブランのオゾン劣化を抑止することができ、且つ、コストアップや量産性の低下を抑えることができる防振装置を提供することを目的としている。   The present invention takes the above-described conventional problems into consideration, can suppress the ozone deterioration of the membrane that closes the side opening of the cylindrical member, and can suppress an increase in cost and a decrease in mass productivity. An object of the present invention is to provide a vibration isolator that can be used.

本発明に係る防振装置は、振動発生部および振動受部のうちの何れか一方に連結されるブラケットと、該ブラケットの筒状のホルダー部の内側に嵌合された筒部材と、前記振動発生部および前記振動受部のうちの何れか他方に連結される取付部材と、前記筒部材と前記取付部材とを弾性的に連結するとともに前記筒部材の一方の開口端を閉塞するゴム弾性体と、前記筒部材の他方の開口端を閉塞するダイヤフラムと、前記筒部材の内側に形成されて液体が封入された液室を、隔壁の一部が前記ゴム弾性体で形成されて前記ゴム弾性体の変形により内容積が変化する主液室と、隔壁の一部が前記ダイヤフラムで形成された副液室と、に区画するとともに、前記主液室と前記副液室とを連通するオリフィス通路を有する仕切り部材と、を備える防振装置において、前記筒部材において前記オリフィス通路と前記主液室との連通部分に隣接する部分に側面開口部が形成されているとともに、前記主液室の内圧の変化に応じて変形可能なメンブランが前記側面開口部を閉塞するように張設されており、前記メンブランの外側面と前記ホルダー部の内周面との間に、隙間があけられており、前記筒部材の外周面と前記ホルダー部の内周面との間に、前記隙間を封止するシール部材が嵌合され、前記隙間が空気室になっていて、前記シール部材は、前記ホルダー部の内周面に圧接する外周部と、前記筒部材の外周面に圧接する内周部と、前記外周部の端部と前記内周部の端部とを連結する折り曲げ部と、を備えており、前記内周部と前記外周部とが相対的に近づく方向に弾性変形した状態で、前記筒部材の外周面と前記ホルダー部の内周面との間に嵌合されていることを特徴としている。 The vibration isolator according to the present invention includes a bracket connected to any one of the vibration generating portion and the vibration receiving portion, a cylindrical member fitted inside a cylindrical holder portion of the bracket, and the vibration A rubber elastic body that elastically connects the cylindrical member and the mounting member, and closes one open end of the cylindrical member, and an attachment member that is connected to the other of the generating portion and the vibration receiving portion A diaphragm that closes the other open end of the cylindrical member; a liquid chamber that is formed inside the cylindrical member and encloses a liquid; and a part of the partition wall is formed of the rubber elastic body, and the rubber elastic An orifice passage that divides a main liquid chamber whose internal volume changes due to body deformation and a sub liquid chamber in which a part of a partition wall is formed of the diaphragm, and communicates the main liquid chamber and the sub liquid chamber A partition member having In the apparatus, a side opening is formed in a portion adjacent to the communicating portion between the orifice passage and the main liquid chamber in the cylindrical member, and a membrane that can be deformed according to a change in the internal pressure of the main liquid chamber is provided. It is stretched so as to close the side opening, and a gap is formed between the outer surface of the membrane and the inner peripheral surface of the holder portion, and the outer peripheral surface of the cylindrical member and the holder portion A seal member that seals the gap is fitted between the inner peripheral surface of the holder, the gap is an air chamber, and the seal member includes an outer peripheral portion that is in pressure contact with the inner peripheral surface of the holder portion. An inner peripheral portion that is in pressure contact with the outer peripheral surface of the cylindrical member, and a bent portion that connects an end portion of the outer peripheral portion and an end portion of the inner peripheral portion, and the inner peripheral portion and the outer peripheral portion. In the state of being elastically deformed in the direction in which the It is characterized in that is fitted between the outer peripheral surface of the cylindrical member and the inner circumferential surface of the holder portion.

このような特徴により、筒部材をホルダー部の内側に嵌合させた後、筒部材の外周面とホルダー部の内周面との間にシール部材を嵌合させることにより、メンブランの径方向外側に形成された空間（隙間）が封止され、その空間への外気の侵入が防止される。また、オリフィス通路と主液室との連通部分において局所的に急激な液圧変動が生じようとしても、この液圧変動がメンブランよって緩和される。   With such a feature, after the cylindrical member is fitted inside the holder portion, the sealing member is fitted between the outer peripheral surface of the cylindrical member and the inner peripheral surface of the holder portion, so that the outer side in the radial direction of the membrane A space (gap) formed in the space is sealed, and intrusion of outside air into the space is prevented. Further, even if a sudden fluid pressure fluctuation locally occurs in the communication portion between the orifice passage and the main fluid chamber, the fluid pressure fluctuation is alleviated by the membrane.

また、前記隙間が空気室になっているので、メンブランが柔軟に変形可能になり、メンブランによってオリフィス通路と主液室との連通部分における液圧変動が確実に緩和される。 In addition, since the gap is an air chamber , the membrane can be flexibly deformed, and the fluid pressure fluctuation at the communicating portion between the orifice passage and the main liquid chamber is surely reduced by the membrane.

また、前記シール部材が、前記ホルダー部の内周面に圧接する外周部と、前記筒部材の外周面に圧接する内周部と、前記外周部の端部と前記内周部の端部とを連結する折り曲げ部と、を備えており、前記内周部と前記外周部とが相対的に近づく方向に弾性変形した状態で、前記筒部材の外周面と前記ホルダー部の内周面との間に嵌合されているので、シール部材の弾性力によって、シール部材の外周部がホルダー部の内周面に圧接されるとともに、シール部材の内周部が筒部材の外周面に圧接される。 The seal member includes an outer peripheral portion that is in pressure contact with the inner peripheral surface of the holder portion, an inner peripheral portion that is in press contact with the outer peripheral surface of the cylindrical member, an end portion of the outer peripheral portion, and an end portion of the inner peripheral portion. A bent portion that connects the outer peripheral surface of the cylindrical member and the inner peripheral surface of the holder portion in a state in which the inner peripheral portion and the outer peripheral portion are elastically deformed in a relatively approaching direction. Since the seal member is fitted in between, the outer peripheral portion of the seal member is pressed against the inner peripheral surface of the holder portion by the elastic force of the seal member, and the inner peripheral portion of the seal member is pressed into contact with the outer peripheral surface of the cylindrical member. .

また、本発明に係る防振装置は、前記内周部が、前記筒部材の軸線方向の長さが前記外周部よりも短くなっていることが好ましい。   Further, in the vibration isolator according to the present invention, it is preferable that the inner peripheral portion has an axial length of the cylindrical member shorter than the outer peripheral portion.

これにより、筒部材の外周面とホルダー部の内周面との間にシール部材を嵌合させる際、まず、外周部がホルダー部の内周面に沿って差し込まれ、その後、内周部が筒部材の外周面に沿って差し込まれる。   Thus, when the sealing member is fitted between the outer peripheral surface of the cylindrical member and the inner peripheral surface of the holder portion, the outer peripheral portion is first inserted along the inner peripheral surface of the holder portion, and then the inner peripheral portion is It is inserted along the outer peripheral surface of the cylindrical member.

また、本発明に係る防振装置は、前記シール部材が、前記筒部材の外周面に沿って環状に形成されていることが好ましい。   In the vibration isolator according to the present invention, it is preferable that the seal member is formed in an annular shape along the outer peripheral surface of the cylindrical member.

これにより、メンブランの外側面に隣接する空間を広くとることが可能であり、その結果、メンブランが柔軟に変形可能になり、メンブランによってオリフィス通路と主液室との連通部分における液圧変動が確実に緩和される。   As a result, the space adjacent to the outer surface of the membrane can be widened. As a result, the membrane can be flexibly deformed, and the membrane can reliably change the hydraulic pressure in the communication portion between the orifice passage and the main fluid chamber. To be relaxed.

また、本発明に係る防振装置は、前記シール部材において前記筒部材の外周面に対向する内側面及び前記ホルダー部の内周面に対向する外側面のうちの少なくとも一方に、前記シール部材の全長に亘って延在する凸条部が突設されていることが好ましい。   In the vibration isolator according to the present invention, at least one of an inner surface facing the outer peripheral surface of the cylindrical member and an outer surface facing the inner peripheral surface of the holder portion in the seal member is provided on the seal member. It is preferable that a protruding ridge portion extending over the entire length is provided.

これにより、凸条部が筒部材の外周面やホルダー部の内周面に当接され、シール性が向上する。   Thereby, a protruding item | line part contact | abuts to the outer peripheral surface of a cylinder member, or the inner peripheral surface of a holder part, and a sealing performance improves.

また、本発明に係る防振装置は、前記シール部材に、前記筒部材及び前記ブラケットのうちの何れか一方に弾性係止される係止部が備えられていることが好ましい。   Moreover, the vibration isolator which concerns on this invention is provided with the latching | locking part elastically latched by any one of the said cylinder member and the said bracket in the said sealing member.

これにより、シール部材を筒部材の外周面とホルダー部の内周面との間に嵌合する際、係止部が筒部材若しくはブラケットに弾性係止されることで、筒部材の外周面とホルダー部の内周面との間に嵌合したシール部材が抜け止めされ、シール部材の位置決めが行われる。   Thus, when the sealing member is fitted between the outer peripheral surface of the cylindrical member and the inner peripheral surface of the holder portion, the locking portion is elastically locked to the cylindrical member or the bracket, so that the outer peripheral surface of the cylindrical member is The sealing member fitted between the inner peripheral surface of the holder part is prevented from coming off, and the sealing member is positioned.

また、本発明に係る防振装置は、前記メンブランと前記ゴム弾性体とが一体に形成されていることが好ましい。   In the vibration isolator according to the present invention, it is preferable that the membrane and the rubber elastic body are integrally formed.

これにより、メンブランのシール性が向上し、筒部材の側面開口部がメンブランによって確実に閉塞される。   Thereby, the sealing performance of the membrane is improved, and the side opening of the cylindrical member is reliably closed by the membrane.

本発明に係る防振装置によれば、メンブランの外側面とホルダー部の内周面との間に形成された空間がシール部材によって封止されるので、メンブランのオゾン劣化を抑止することができる。また、ブラケットのホルダー部に筒部材を嵌合させた後、筒部材の外周面とホルダー部の内周面との間にシール部材を嵌合させるだけで防振装置が製作されるので、防振装置の製造作業が容易であり、コストアップや量産性の低下を抑えることができる。   According to the vibration isolator according to the present invention, the space formed between the outer surface of the membrane and the inner peripheral surface of the holder portion is sealed by the sealing member, so that the ozone deterioration of the membrane can be suppressed. . In addition, since the vibration isolator is manufactured by simply fitting the seal member between the outer peripheral surface of the cylindrical member and the inner peripheral surface of the holder portion after fitting the cylindrical member to the holder portion of the bracket, The vibration device can be manufactured easily, and cost increases and mass productivity reduction can be suppressed.

以下、本発明に係る防振装置の実施の形態について、図面に基いて説明する。   DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a vibration isolator according to the present invention will be described with reference to the drawings.

図１は本実施の形態における防振装置１の断面図であり、図２は後述するシール部材９の斜視図であり、図３はシール部材９の断面図であり、図４は防振装置１のバウンド側の部分を表した斜視図であり、図５は後述する仕切り部材７の分解斜視図である。
また、本実施の形態では、図１における下側がバウンド側、つまり防振装置１を設置した際に静荷重（初期荷重）が入力される方向であり、図１における上側がリバウンド側、つまり前記静荷重の入力方向の反対側であり、以下の説明においてバウンド側を下側とし、リバウンド側を上側とする。 1 is a cross-sectional view of a vibration isolator 1 according to the present embodiment, FIG. 2 is a perspective view of a seal member 9 to be described later, FIG. 3 is a cross-sectional view of the seal member 9, and FIG. FIG. 5 is an exploded perspective view of a partition member 7 to be described later.
Further, in the present embodiment, the lower side in FIG. 1 is the bounce side, that is, the direction in which a static load (initial load) is input when the vibration isolator 1 is installed, and the upper side in FIG. This is the opposite side of the static load input direction, and in the following description, the bound side is the lower side and the rebound side is the upper side.

図１に示すように、防振装置１は、振動発生部の一例であるエンジンを振動受部の一例である車体にマウントさせる際に用いられるものであり、振動発生部の振動を減衰させるための装置である。図１に示すように、防振装置１は、互いに同軸Ｌ上に配置される内筒２（本発明における取付部材に相当する。）及び外筒３（本発明における筒部材に相当する。）と、これら内筒２及び外筒３に加硫接着により一体的に成形されるゴム弾性体４と、図示せぬ車体に取り付けられる車体側ブラケット１０（本発明におけるブラケットに相当する。）と、を備える基本構成である。   As shown in FIG. 1, the vibration isolator 1 is used when an engine, which is an example of a vibration generating unit, is mounted on a vehicle body, which is an example of a vibration receiving unit, to attenuate the vibration of the vibration generating unit. It is a device. As shown in FIG. 1, the vibration isolator 1 includes an inner cylinder 2 (corresponding to an attachment member in the present invention) and an outer cylinder 3 (corresponding to a cylinder member in the present invention) arranged on the same axis L. A rubber elastic body 4 integrally formed with the inner cylinder 2 and the outer cylinder 3 by vulcanization adhesion, a vehicle body side bracket 10 (corresponding to a bracket in the present invention) attached to a vehicle body (not shown), and Is a basic configuration.

内筒２は、図示せぬエンジンに連結される部材である。詳しく説明すると、内筒２は、下側に向かうに従い漸次縮径されて下端が球状に丸められた部材であり、ゴム弾性体４内に埋設されている。内筒２には、その上端面から下方に延在する有底の雌ねじ部２ａが形成されており、この雌ねじ部２ａに螺合される図示せぬボルトによって、図示せぬエンジンに取り付けられた図示せぬエンジン側ブラケットが取り付けられる。   The inner cylinder 2 is a member connected to an engine (not shown). More specifically, the inner cylinder 2 is a member that is gradually reduced in diameter toward the lower side and whose lower end is rounded into a spherical shape, and is embedded in the rubber elastic body 4. The inner cylinder 2 is formed with a bottomed female screw portion 2a extending downward from the upper end surface thereof, and is attached to an engine (not shown) by a bolt (not shown) screwed into the female screw portion 2a. An unillustrated engine side bracket is attached.

車体側ブラケット１０は、外筒３を保持する略円筒形状のホルダー部１１と、図示せぬ車体に連結される脚部１２と、を備えている。ホルダー部１１は、上側の小径部１３と、下側の大径部１４と、小径部１３と大径部１４との間に介在されて小径部１３の下端から大径部１４の上端に向かうに従い漸次拡径されたテーパー部１５と、小径部１３の上端部から径方向外側に突出したフランジ部１６と、を備えている。脚部１２は、径方向外側に張り出された縦断面視略Ｌ字状の板部であり、大径部１４の中心軸線を挟んで左右両側にそれぞれ配設されている。この脚部１２において大径部１４の下端よりも下側に位置して外筒３の下端部の外周面に対向する部分に開口１２ａが形成されている。脚部１２の両側端にはリブ１２ｂがそれぞれ設けられている。   The vehicle body side bracket 10 includes a substantially cylindrical holder portion 11 that holds the outer cylinder 3, and a leg portion 12 that is connected to a vehicle body (not shown). The holder portion 11 is interposed between the upper small-diameter portion 13, the lower large-diameter portion 14, and the small-diameter portion 13 and the large-diameter portion 14, and extends from the lower end of the small-diameter portion 13 toward the upper end of the large-diameter portion 14. And a flange portion 16 that protrudes radially outward from the upper end portion of the small-diameter portion 13. The leg portion 12 is a substantially L-shaped plate portion that projects outward in the radial direction, and is disposed on both the left and right sides of the central axis of the large diameter portion 14. An opening 12 a is formed in a portion of the leg portion 12 that is located below the lower end of the large-diameter portion 14 and faces the outer peripheral surface of the lower end portion of the outer cylinder 3. Ribs 12b are provided on both ends of the leg portion 12, respectively.

外筒３は、ホルダー部１１の内側に嵌合される略円筒形状の部材である。詳しく説明すると、外筒３は、下側の小径部３０と、上側の大径部３１と、小径部３０と大径部３１との間に介在されて径方向内側に縮径された絞り部３２と、を備えている。大径部３１の内周面には、ゴム弾性体４の外周部が加硫接着されている。また、絞り部３２及び小径部３０の内周面には、内周被覆ゴム３３が全周に亘って被覆されている。この内周被覆ゴム３３は、絞り部３２及び小径部３０の内周面に加硫接着されており、その上端がゴム弾性体４の下端に連結されてゴム弾性体４と一体に形成されている。   The outer cylinder 3 is a substantially cylindrical member fitted inside the holder portion 11. More specifically, the outer cylinder 3 includes a lower small-diameter portion 30, an upper large-diameter portion 31, and a throttle portion that is interposed between the small-diameter portion 30 and the large-diameter portion 31 and is reduced in diameter in the radial direction. 32. The outer peripheral portion of the rubber elastic body 4 is vulcanized and bonded to the inner peripheral surface of the large diameter portion 31. Further, the inner peripheral surfaces of the narrowed portion 32 and the small diameter portion 30 are covered with an inner peripheral covering rubber 33 over the entire periphery. The inner peripheral covering rubber 33 is vulcanized and bonded to the inner peripheral surfaces of the narrowed portion 32 and the small diameter portion 30, and its upper end is connected to the lower end of the rubber elastic body 4 and is integrally formed with the rubber elastic body 4. Yes.

また、外筒３において後述するオリフィス通路８１と後述する主液室６Ａとの連通部分（主液室側連通路８４）に隣接する部分には、側面開口部３５が形成されている。具体的に説明すると、外筒３の小径部３０に側面開口部３５が形成されている。そして、この側面開口部３５は、薄膜状のメンブラン３６によって閉塞されている。メンブラン３６は、後述する主液室６Ａの内圧の変化に応じて変形可能なゴム膜であり、側面開口部３５を閉塞するように張設されている。このメンブラン３６は、上記した内周被覆ゴム３３に連結されており、ゴム弾性体４及び内周被覆ゴム３３と一体に形成されている。   A side opening 35 is formed in a portion of the outer cylinder 3 adjacent to a communication portion (main liquid chamber side communication passage 84) between an orifice passage 81 described later and a main liquid chamber 6 </ b> A described later. More specifically, a side opening 35 is formed in the small diameter portion 30 of the outer cylinder 3. The side opening 35 is closed by a thin film membrane 36. The membrane 36 is a rubber film that can be deformed in accordance with a change in the internal pressure of the main liquid chamber 6 </ b> A described later, and is stretched so as to close the side opening 35. The membrane 36 is connected to the inner peripheral covering rubber 33 described above, and is formed integrally with the rubber elastic body 4 and the inner peripheral covering rubber 33.

また、絞り部３２及び小径部３０の上端部の外周面には、外周シールゴム３４が全周に亘って周設されている。この外周シールゴム３４は、絞り部３２及び小径部３０の上端部の外周面に加硫接着されとり、メンブラン３６の上端に連結されて、ゴム弾性体４、内周被覆ゴム３３及びメンブラン３６と一体に形成されている。   Further, an outer peripheral seal rubber 34 is provided on the outer peripheral surfaces of the upper end portions of the throttle portion 32 and the small diameter portion 30 over the entire circumference. The outer peripheral seal rubber 34 is vulcanized and bonded to the outer peripheral surfaces of the upper end portions of the throttle portion 32 and the small diameter portion 30 and connected to the upper end of the membrane 36 so as to be integrated with the rubber elastic body 4, the inner peripheral covering rubber 33 and the membrane 36. Is formed.

上記した構成からなる外筒３は、車体側ブラケット１０のホルダー部１１の内側に嵌合されている。詳しく説明すると、外筒３はホルダー部１１の内側に圧入されており、ホルダー部１１の小径部１３の内側に、外筒３の大径部３１、絞り部３２及び小径部３０の上端部が配置され、外筒３の外周シールゴム３４がホルダー部１１の小径部１３の内側に圧接されている。また、ホルダー部１１の大径部１４の内側には、外筒３の小径部３０が間隔をあけて配置されており、ホルダー部１１の内周面と外筒３の外周面との間には全周に亘って隙間Ｓが形成されている。すなわち、ホルダー部１１の大径部１４の内周面と外筒３の小径部３０の外周面との間、及びホルダー部１１の大径部１４の内周面とメンブラン３６の外側面との間には隙間Ｓがあけられている。この隙間Ｓには液体等が充填されてなく、当該隙間Ｓは空気室になっている。   The outer cylinder 3 having the above-described configuration is fitted inside the holder portion 11 of the vehicle body side bracket 10. More specifically, the outer cylinder 3 is press-fitted inside the holder part 11, and the large diameter part 31, the throttle part 32, and the upper end part of the small diameter part 30 of the outer cylinder 3 are inside the small diameter part 13 of the holder part 11. The outer peripheral seal rubber 34 of the outer cylinder 3 is pressed against the inside of the small diameter portion 13 of the holder portion 11. Further, a small diameter portion 30 of the outer cylinder 3 is disposed inside the large diameter portion 14 of the holder portion 11 with a space therebetween, and between the inner peripheral surface of the holder portion 11 and the outer peripheral surface of the outer cylinder 3. A gap S is formed over the entire circumference. That is, between the inner peripheral surface of the large diameter portion 14 of the holder portion 11 and the outer peripheral surface of the small diameter portion 30 of the outer cylinder 3, and between the inner peripheral surface of the large diameter portion 14 of the holder portion 11 and the outer surface of the membrane 36. There is a gap S between them. The gap S is not filled with liquid or the like, and the gap S is an air chamber.

上記した外筒３の外周面とホルダー部１１の内周面との間には、上記した隙間Ｓを封止するシール部材９が嵌合されている。シール部材９は、縦断面視略Ｕ字形状のものを外筒３（小径部３０）の外周面に沿って環状に形成したリング部材であり、車体側ブラケット１０や外筒３やゴム弾性体４とは別体の部材である。   A seal member 9 that seals the gap S described above is fitted between the outer peripheral surface of the outer cylinder 3 and the inner peripheral surface of the holder portion 11. The seal member 9 is a ring member formed in a ring shape along the outer peripheral surface of the outer cylinder 3 (small-diameter portion 30) having a substantially U shape in a longitudinal section, and includes a vehicle body side bracket 10, the outer cylinder 3, and a rubber elastic body. 4 is a separate member.

図２、図３に示すように、このシール部材９の概略構成としては、図１に示すホルダー部１１の内周面に圧接する筒状の外周部９０と、外周部９０の径方向内側に配設されて図１に示す外筒３の外周面に圧接する筒状の内周部９１と、外周部９０の下端部と内周部９１の下端部とを連結する折り曲げ部９２と、を備えている。つまり、シール部材９は、略円筒部材の下端部を径方向内側に折り返した形状になっている。内周部９１は外筒３の軸線方向の長さが外周部９０よりも短くなっており、縦断面視において外周部９０は内周部９１よりも上方に延在されている。   As shown in FIGS. 2 and 3, the seal member 9 has a schematic configuration in which a cylindrical outer peripheral portion 90 that is in pressure contact with the inner peripheral surface of the holder portion 11 shown in FIG. 1 and a radially inner side of the outer peripheral portion 90. A cylindrical inner peripheral portion 91 that is disposed and press-contacts with the outer peripheral surface of the outer cylinder 3 shown in FIG. 1, and a bent portion 92 that connects the lower end portion of the outer peripheral portion 90 and the lower end portion of the inner peripheral portion 91. I have. That is, the seal member 9 has a shape in which the lower end portion of the substantially cylindrical member is folded back inward in the radial direction. The inner peripheral portion 91 is shorter in the axial direction of the outer cylinder 3 than the outer peripheral portion 90, and the outer peripheral portion 90 extends upward from the inner peripheral portion 91 in a longitudinal sectional view.

シール部材９において、図１に示すホルダー部１１の内周面に対向する外周面、及び図１に示す外筒３の外周面に対向する内周面には、シール部材９の全周（全長）に亘って延在する凸条部９０ａ，９１ａがそれぞれ突設されている。詳しく説明すると、外周部９０の上部外周面には、径方向外側に膨出した凸条部９０ａが形成されている。この凸条部９０ａは、外周部９０の外周面に沿って周方向に延設されている。また、内周部９１の上部内周面には、径方向内側に膨出した凸条部９１ａが形成されている。この凸条部９１ａは、内周部９１の内周面に沿って周方向に延設されている。   In the seal member 9, the entire circumference (full length) of the seal member 9 is formed on the outer peripheral surface facing the inner peripheral surface of the holder portion 11 shown in FIG. 1 and the inner peripheral surface facing the outer peripheral surface of the outer cylinder 3 shown in FIG. ) Projecting ridges 90a and 91a are provided to extend. More specifically, a ridge 90a bulging radially outward is formed on the upper outer peripheral surface of the outer peripheral portion 90. The ridge portion 90 a is extended in the circumferential direction along the outer peripheral surface of the outer peripheral portion 90. Further, on the upper inner peripheral surface of the inner peripheral portion 91, a protruding strip portion 91a bulging radially inward is formed. The protruding portion 91 a extends in the circumferential direction along the inner peripheral surface of the inner peripheral portion 91.

上記した構成からなるシール部材９は、図１に示すように、外周部９０と内周部９１とが相対的に近づく方向に弾性変形した状態で、外筒３の外周面とホルダー部１１の内周面との間に嵌合されており、図３に示す外周部９０の凸条部９０ａがホルダー部１１の内周面に圧接されているとともに、図３に示す内周部９１の凸条部９１ａが外筒３の外周面に圧接されている。   As shown in FIG. 1, the sealing member 9 having the above-described configuration is elastically deformed in a direction in which the outer peripheral portion 90 and the inner peripheral portion 91 are relatively close to each other, and the outer peripheral surface of the outer cylinder 3 and the holder portion 11 are 3 is fitted to the inner peripheral surface, and the convex strip 90a of the outer peripheral portion 90 shown in FIG. 3 is pressed against the inner peripheral surface of the holder portion 11, and the convex portion of the inner peripheral portion 91 shown in FIG. The strip 91 a is pressed against the outer peripheral surface of the outer cylinder 3.

また、図２、図３に示すように、シール部材９の外周面には、径方向外側に突出したフランジ部９３が形成されている。このフランジ部９３は、シール部材９の全周に亘って延設された断面視矩形状の凸部であり、外周部９０の軸線方向の中間部分に形成されている。このフランジ部９３の上面は、図１、図４に示すように、ホルダー部１１（大径部１４）の下端面に当接されている。   As shown in FIGS. 2 and 3, a flange portion 93 protruding outward in the radial direction is formed on the outer peripheral surface of the seal member 9. The flange portion 93 is a convex portion having a rectangular shape in a cross-sectional view and extending over the entire circumference of the seal member 9, and is formed at an intermediate portion in the axial direction of the outer peripheral portion 90. As shown in FIGS. 1 and 4, the upper surface of the flange portion 93 is in contact with the lower end surface of the holder portion 11 (large diameter portion 14).

また、シール部材９には、車体側ブラケット１０に弾性係止される係止部９４が設けられている。詳しく説明すると、係止部９４は、外周部９０の外側に配設された板片であり、フランジ部９３の先端面から下方に向けて垂下されている。この係止部９４は、その基端部が弾性変形することにより径方向内側に移動可能になっている。また、係止部９４は、シール部材９の中心軸線を挟んで左右両側にそれぞれ配設されており、これらの係止部９４は、図１、図４に示すように、車体側ブラケット１０の脚部１２の開口１２ａ内にそれぞれ配置され、係止部９４の下端面が上記開口１２ａの下辺部分に当接されている。   The seal member 9 is provided with a locking portion 94 that is elastically locked to the vehicle body side bracket 10. More specifically, the locking portion 94 is a plate piece disposed outside the outer peripheral portion 90 and is suspended downward from the front end surface of the flange portion 93. The locking portion 94 is movable inward in the radial direction by elastic deformation of the base end portion. Further, the locking portions 94 are disposed on both the left and right sides of the center axis of the seal member 9, and these locking portions 94 are provided on the vehicle body side bracket 10 as shown in FIGS. 1 and 4. It arrange | positions in the opening 12a of the leg part 12, respectively, and the lower end surface of the latching | locking part 94 is contact | abutted to the lower side part of the said opening 12a.

図１に示すように、ゴム弾性体４は、内筒２と外筒３とを弾性的に連結するとともに外筒３の上側（一方）の開放端を閉塞する部材である。詳しく説明すると、ゴム弾性体４は、外筒３の大径部３１を閉塞するドーム状のゴム弾性体であり、大径部３１の内周面と、内筒２の胴部２１の外周面との間に介在されている。   As shown in FIG. 1, the rubber elastic body 4 is a member that elastically connects the inner cylinder 2 and the outer cylinder 3 and closes the open end on the upper side (one side) of the outer cylinder 3. More specifically, the rubber elastic body 4 is a dome-shaped rubber elastic body that closes the large-diameter portion 31 of the outer cylinder 3, and the inner peripheral surface of the large-diameter portion 31 and the outer peripheral surface of the trunk portion 21 of the inner cylinder 2. It is interposed between.

また、防振装置１には、外筒３の下側（他方）の開放端を閉塞するダイヤフラム５が備えられており、このダイヤフラム５と上記したゴム弾性体４との間には、例えばエチレングリコールや水、シリコーンオイル等の液体が封入された液室６が形成されている。
詳しく説明すると、ダイヤフラム５は、外筒３の小径部３０の内側に内周ゴム３３を介して嵌合されたダイヤフラムリング５０と、ダイヤフラムリング５０の内側に形成されたダイヤフラムゴム５１と、を備えている。ダイヤフラムリング５０は、金属製の環状部材であり、外筒３の下端部の内側に嵌め込まれ、外筒３の下端部を径方向内側に屈曲させることによりカシメ固定されている。ダイヤフラムゴム５１は、後述する副液室６Ｂ内の液圧（内圧）の変化に応じて変形可能な薄膜部材であり、ダイヤフラムリング５０の内周面に加硫接着されている。 Further, the vibration isolator 1 is provided with a diaphragm 5 that closes the lower (other) open end of the outer cylinder 3. Between the diaphragm 5 and the rubber elastic body 4, for example, ethylene A liquid chamber 6 in which a liquid such as glycol, water, or silicone oil is enclosed is formed.
More specifically, the diaphragm 5 includes a diaphragm ring 50 fitted inside the small diameter portion 30 of the outer cylinder 3 via an inner peripheral rubber 33, and a diaphragm rubber 51 formed inside the diaphragm ring 50. ing. The diaphragm ring 50 is a metal annular member, is fitted inside the lower end portion of the outer cylinder 3, and is crimped and fixed by bending the lower end portion of the outer cylinder 3 radially inward. The diaphragm rubber 51 is a thin film member that can be deformed in accordance with a change in the hydraulic pressure (internal pressure) in the sub-liquid chamber 6B described later, and is vulcanized and bonded to the inner peripheral surface of the diaphragm ring 50.

液室６は、ゴム弾性体４の下面と外筒３の内周面（内周ゴム３３）とダイヤフラム５の上面とで囲まれた室である。この液室６は、その内部に配設された仕切り部材７によって、リバウンド側の主液室６Ａとバウンド側の副液室６Ｂとに区画されている。主液室６Ａは、隔壁の一部（上壁）がゴム弾性体４で形成された室であり、主液室６Ａの内容積は、ゴム弾性体４の変形により変化する。副液室６Ｂは、隔壁の一部（下壁）がダイヤフラム５（ダイヤフラムゴム５１）で形成された室であり、副液室６Ｂの内容積は、副液室６Ｂ内の液圧（内圧）の変化によってダイヤフラム５（ダイヤフラムゴム５１）が変形することで変化する。   The liquid chamber 6 is a chamber surrounded by the lower surface of the rubber elastic body 4, the inner peripheral surface (inner peripheral rubber 33) of the outer cylinder 3, and the upper surface of the diaphragm 5. The liquid chamber 6 is partitioned into a rebound-side main liquid chamber 6A and a bound-side sub-liquid chamber 6B by a partition member 7 disposed therein. The main liquid chamber 6 </ b> A is a chamber in which a part of the partition wall (upper wall) is formed of the rubber elastic body 4, and the internal volume of the main liquid chamber 6 </ b> A changes due to deformation of the rubber elastic body 4. The sub liquid chamber 6B is a chamber in which a part of the partition wall (lower wall) is formed of the diaphragm 5 (diaphragm rubber 51), and the internal volume of the sub liquid chamber 6B is the liquid pressure (internal pressure) in the sub liquid chamber 6B. It changes when the diaphragm 5 (diaphragm rubber 51) deform | transforms by the change of.

上記した仕切り部材７は、外筒３の内側に配設され、上記した主液室６Ａと副液室６Ｂとの間に介在されている。この仕切り部材７は、上端が開口された略有底円筒状のオリフィス部材７０と、オリフィス部材７０の内側に上下方向に移動自在に配設されたピストン７１と、ピストン７１を上方に付勢する付勢部材７２と、オリフィス部材７０の上端開口部を覆う蓋部材７３と、蓋部材７３に形成された連通孔７３ａを開閉する逆止弁７４と、オリフィス部材７０の内側の底面に配設された緩衝部材７５と、を備えている。   The partition member 7 described above is disposed inside the outer cylinder 3, and is interposed between the main liquid chamber 6A and the sub liquid chamber 6B. The partition member 7 has a generally bottomed cylindrical orifice member 70 having an open upper end, a piston 71 disposed inside the orifice member 70 so as to be movable in the vertical direction, and urges the piston 71 upward. The biasing member 72, a lid member 73 that covers the upper end opening of the orifice member 70, a check valve 74 that opens and closes a communication hole 73 a formed in the lid member 73, and a bottom surface inside the orifice member 70. Buffer member 75.

オリフィス部材７０は、外筒３の内側に嵌合された部材であり、中央部分にピストン７１を収容するシリンダ室７６が形成されている。シリンダ室７６は、上下方向に延在する丸孔状の空間であり、上端が開口されて下端が底板部７８によって閉塞されている。シリンダ室７６の内側には、底板部７８の中央部分から起立された棒状の軸部材７９が配設されている。軸部材７９は、シリンダ室７６の中心軸線上に延設されており、この軸部材７９の下端部は、オリフィス部材７０の底板部７８の中央部分に形成された円筒状の軸受け部８０内に嵌合されている。また、底板部７８には、軸受け部８０の周りに液体が流通する複数の流通孔８７が形成されており、この流通孔８７を介してシリンダ室７６の下部と上記した副液室６Ｂとが連通されている。また、オリフィス部材７０の上端部には、径方向内側に縮径された被圧入部８８が全周に亘って形成されている。   The orifice member 70 is a member fitted inside the outer cylinder 3, and a cylinder chamber 76 that houses the piston 71 is formed in the center portion. The cylinder chamber 76 is a round hole-like space extending in the vertical direction, and has an upper end opened and a lower end closed by a bottom plate portion 78. Inside the cylinder chamber 76, a rod-shaped shaft member 79 erected from the center portion of the bottom plate portion 78 is disposed. The shaft member 79 extends on the central axis of the cylinder chamber 76, and the lower end portion of the shaft member 79 is in a cylindrical bearing portion 80 formed at the center portion of the bottom plate portion 78 of the orifice member 70. It is mated. The bottom plate portion 78 is formed with a plurality of flow holes 87 through which the liquid flows around the bearing portion 80, and the lower portion of the cylinder chamber 76 and the sub liquid chamber 6 </ b> B described above are formed through the flow holes 87. It is communicated. In addition, a press-fit portion 88 that is reduced in diameter in the radial direction is formed on the upper end portion of the orifice member 70 over the entire circumference.

また、オリフィス部材７０には、上記主液室６Ａと副液室６Ｂとを連通するオリフィス通路８１が形成されている。このオリフィス通路８１は、防振装置１に振動が入力された際に当該オリフィス通路８１を流通する液体に液柱共振（共振現象）を生じさせて上記振動を減衰させるための液路であり、車両における低周波域（例えば８Ｈｚ〜１２Ｈｚ）の共振振動であるシェイク振動の周波数及び振幅に対応するようにチューニングされたシェイクオリフィス８１Ａと、車両のアイドリング運転時に発生する高周波域（例えば２０Ｈｚ〜４０Ｈｚ）のアイドル振動の周波数及び振幅に対応するようにチューニングされたアイドルオリフィス８１Ｂと、に分けられている。   The orifice member 70 is formed with an orifice passage 81 that communicates the main liquid chamber 6A and the sub liquid chamber 6B. The orifice passage 81 is a liquid passage for attenuating the vibration by causing liquid column resonance (resonance phenomenon) in the liquid flowing through the orifice passage 81 when vibration is input to the vibration isolator 1. Shake orifice 81A tuned so as to correspond to the frequency and amplitude of the shake vibration that is a resonance vibration in a low frequency range (for example, 8 Hz to 12 Hz) in the vehicle, and a high frequency range (for example, 20 Hz to 40 Hz) generated during idling operation of the vehicle. And an idle orifice 81B tuned to correspond to the frequency and amplitude of the idle vibration.

具体的に説明すると、オリフィス部材７０の上部の外周面には、オリフィス部材７０の周方向に延在する第一溝８２が形成されており、オリフィス部材７０の下部の外周面には、オリフィス部材７０の周方向に延在する第二溝８３が形成されている。第一溝８２の一端は、オリフィス部材７０の上端部に形成された主液室側連通路８４を介して上記した主液室６Ａに連通されている。この主液室側連通路８４は、上端が主液室６Ａに向けて開放されているとともに下端が第一溝８２の一端部に向けて開放されており、外側面（オリフィス部材７０の径方向外側の面）がメンブラン３６で閉塞されている。また、第一溝８２の他端は、第二溝８３の一端に連通されており、第二溝８３の他端は、オリフィス部材７０の下端部に形成された副液室側連通路８５を介して上記した副液室６Ｂに連通されている。また、第一溝８２の他端部の内周部分には、オリフィス開口８６が形成されている。このオリフィス開口８６は、オリフィス部材７０の周方向に長い長孔であり、その面積が第二溝８３の断面積よりも大きくなっている。第一溝８２の他端部とシリンダ室７６の下部とは、前記オリフィス開口８６を介して連通されている。すなわち、上記したシェイクオリフィス８１Ａは、上記した主液室側連通路８４と第一溝８２と第二溝８３と副液室側連通路８５とにより形成されている。また、上記したアイドルオリフィス８１Ｂは、上記した主液室側連通路８４と第一溝８２とオリフィス開口８６とシリンダ室７６の下部と流通孔８７とにより形成されている。シェイクオリフィス８１Ａは、アイドルオリフィス８１Ｂよりも液体の流通抵抗が大きくなっている。   More specifically, a first groove 82 extending in the circumferential direction of the orifice member 70 is formed on the outer peripheral surface of the upper portion of the orifice member 70, and the orifice member is formed on the outer peripheral surface of the lower portion of the orifice member 70. A second groove 83 extending in the circumferential direction of 70 is formed. One end of the first groove 82 communicates with the main liquid chamber 6 </ b> A described above via a main liquid chamber side communication passage 84 formed in the upper end portion of the orifice member 70. The main liquid chamber side communication passage 84 has an upper end opened toward the main liquid chamber 6A and a lower end opened toward one end of the first groove 82, and the outer surface (the radial direction of the orifice member 70). The outer surface is closed with a membrane 36. The other end of the first groove 82 communicates with one end of the second groove 83, and the other end of the second groove 83 passes through the sub liquid chamber side communication passage 85 formed in the lower end portion of the orifice member 70. Through the auxiliary liquid chamber 6B. An orifice opening 86 is formed in the inner peripheral portion of the other end of the first groove 82. The orifice opening 86 is a long hole that is long in the circumferential direction of the orifice member 70, and its area is larger than the cross-sectional area of the second groove 83. The other end of the first groove 82 and the lower portion of the cylinder chamber 76 communicate with each other through the orifice opening 86. That is, the shake orifice 81A is formed by the main liquid chamber side communication passage 84, the first groove 82, the second groove 83, and the sub liquid chamber side communication passage 85. The idle orifice 81B is formed by the main liquid chamber side communication passage 84, the first groove 82, the orifice opening 86, the lower portion of the cylinder chamber 76, and the flow hole 87. The shake orifice 81A has a greater liquid flow resistance than the idle orifice 81B.

ピストン７１は、アイドルオリフィス８１Ｂを開閉（開放／遮断）する可動部材であり、シリンダ室７６内に収容されて軸部材７９に沿って移動自在に設けられた略円盤状の部材である。詳しく説明すると、ピストン７１の外周面はシリンダ室７６の内周面に沿って形成されており、ピストン７１の中央部分には軸部材７９が挿入された筒部７１ａが設けられている。このピストン７１は、上記したオリフィス開口８６よりも上方に配置されてアイドルオリフィス８１Ｂを開放する位置（図１に示す位置）と、オリフィス開口８６を閉塞してアイドルオリフィス８１Ｂを遮断する位置（図示せず）との間で移動可能になっている。   The piston 71 is a movable member that opens and closes (opens / closes) the idle orifice 81 </ b> B, and is a substantially disk-shaped member that is accommodated in the cylinder chamber 76 and is movably provided along the shaft member 79. More specifically, the outer peripheral surface of the piston 71 is formed along the inner peripheral surface of the cylinder chamber 76, and a cylindrical portion 71 a into which a shaft member 79 is inserted is provided at the central portion of the piston 71. The piston 71 is disposed above the orifice opening 86 to open the idle orifice 81B (the position shown in FIG. 1), and closes the orifice opening 86 to block the idle orifice 81B (not shown). Z)).

付勢部材７２は、底板部７８とピストン７１との間に圧縮変形した状態で介装されたコイルスプリングであり、予圧縮力が作用した状態で設置されている。この付勢部材７２の下端部は、底板部７８の中央部分に形成された凹部７８ａの内側に嵌合されており、また、付勢部材７２の上端部は、ピストン７１の筒部７１ａの外側に嵌合されており、付勢部材７２の内側には上記した軸部材７９が挿入されている。   The urging member 72 is a coil spring that is interposed between the bottom plate portion 78 and the piston 71 in a compressed and deformed state, and is installed in a state in which a precompression force is applied. The lower end portion of the urging member 72 is fitted inside a recess 78 a formed in the central portion of the bottom plate portion 78, and the upper end portion of the urging member 72 is outside the cylinder portion 71 a of the piston 71. The shaft member 79 is inserted inside the urging member 72.

蓋部材７３は、オリフィス部材７０の上端部に圧入嵌合される部材であり、上記したシリンダ室７６の上端開口部を閉塞する平面視略円形の天壁部７３ｂと、天壁部７３ｂの外縁部から垂設された略円筒状の周壁部７３ｃと、を備えている。天壁部７３ｂの中央部分には、後述する逆止弁７４の嵌合部７４ｃが嵌合される嵌合孔７３ｄが形成されており、この嵌合孔７３ｃの周りに複数の連通孔７３ａが形成されている。また、周壁部７３ｃの内径は、オリフィス部材７０の被圧入部８８の外径よりも若干小さく、周壁部７３ｃは被圧入部８８の外側に圧入嵌合されている。また、蓋部材７３において上記した主液室側連通路８４に対応する部分が切り欠き部７３ｅが形成されており、蓋部材７３は、主液室側連通路８４を閉塞しないような形状になっている。   The lid member 73 is a member that is press-fitted into the upper end portion of the orifice member 70, and has a top wall portion 73b that is substantially circular in plan view and closes the upper end opening of the cylinder chamber 76, and an outer edge of the top wall portion 73b. A substantially cylindrical peripheral wall portion 73c that is suspended from the portion. A fitting hole 73d into which a fitting part 74c of a check valve 74, which will be described later, is fitted is formed in the central portion of the top wall 73b, and a plurality of communication holes 73a are formed around the fitting hole 73c. Is formed. In addition, the inner diameter of the peripheral wall portion 73 c is slightly smaller than the outer diameter of the press-fit portion 88 of the orifice member 70, and the peripheral wall portion 73 c is press-fitted to the outside of the press-fit portion 88. Further, a portion corresponding to the main liquid chamber side communication path 84 in the lid member 73 is formed with a notch 73e, and the lid member 73 is shaped so as not to close the main liquid chamber side communication path 84. ing.

逆止弁７４は、蓋部材７３の内側（連通孔７３ａの下方）に配設された部材であり、その概略構成としては、円環状の外周部７４ａと、外周部７４ａの内側に配設された弾性変形可能な略円盤状の弁体部７４ｂと、弁体部７４ｂの上面の中央部分から立設された嵌合部７４ｃと、を備えている。外周部７４ａの内縁部と弁体部７４ｂの外縁部とは弾性変形可能な連結部７４ｄを介して連結されている。外周部７４ａは、オリフィス部材７０の上端面と蓋部材７３の天壁部７３ｂとの間に挟持されており、嵌合部７４ｃは、蓋部材７３の嵌合孔７３ｄに嵌合されており、弁体部７４ｂの上面は、所定の予圧力で蓋部材７３の天壁部７３ｂの下面に圧接されている。また、弁体部７４ｂの下面の中央部分には凹部７４ｅが形成されており、この凹部７４ｅの内側に上記した軸部材７９の上端が嵌合されている。   The check valve 74 is a member disposed on the inner side of the lid member 73 (below the communication hole 73a). As a schematic configuration, the check valve 74 is disposed on the inner periphery of the annular outer peripheral portion 74a and the outer peripheral portion 74a. And a substantially disc-shaped valve body portion 74b that can be elastically deformed, and a fitting portion 74c that is erected from the central portion of the upper surface of the valve body portion 74b. The inner edge part of the outer peripheral part 74a and the outer edge part of the valve body part 74b are connected via a connecting part 74d that can be elastically deformed. The outer peripheral portion 74a is sandwiched between the upper end surface of the orifice member 70 and the top wall portion 73b of the lid member 73, and the fitting portion 74c is fitted in the fitting hole 73d of the lid member 73. The upper surface of the valve body 74b is in pressure contact with the lower surface of the top wall 73b of the lid member 73 with a predetermined preload. Further, a recess 74e is formed in the central portion of the lower surface of the valve body 74b, and the upper end of the shaft member 79 is fitted inside the recess 74e.

緩衝部材７５は、ピストン７１がシリンダ室７６の底部まで下降した際の衝撃を緩和するための弾性部材である。緩衝部材７５は円環状に形成されており、平面視において緩衝部材７５の内側に底板部７８の流通孔８７が配設されている。   The buffer member 75 is an elastic member for alleviating an impact when the piston 71 descends to the bottom of the cylinder chamber 76. The buffer member 75 is formed in an annular shape, and the flow hole 87 of the bottom plate portion 78 is disposed inside the buffer member 75 in plan view.

次に、上記した構成からなる防振装置１の製造工程について説明する。   Next, a manufacturing process of the vibration isolator 1 having the above configuration will be described.

まず、内筒２と外筒３との間にゴム弾性体４を形成する工程を行う。詳しく説明すると、ゴム弾性体４の金型の中に外筒３及び内筒２をそれぞれ所定位置に配置するとともに、外筒３の内周面全体、外筒３の絞り部３２の外周面、外筒３の小径部３０の上端部の外周面、及び側面開口部３５の内周面に、それぞれ接着剤を塗布するとともに、内筒２の外周面に接着剤を塗布する。その後、上記金型の中に加硫ゴムを流し込んでゴム弾性体４を加硫成形するとともに、このゴム弾性体４と一体に内周被覆ゴム３３、外周シールゴム３４、及びメンブラン３６をそれぞれ加硫成形する。そして、上記したゴム弾性体４や内周被覆ゴム３３等の硬化後に上記金型を取り外す。   First, the process of forming the rubber elastic body 4 between the inner cylinder 2 and the outer cylinder 3 is performed. More specifically, the outer cylinder 3 and the inner cylinder 2 are respectively disposed at predetermined positions in the mold of the rubber elastic body 4, and the entire inner peripheral surface of the outer cylinder 3, the outer peripheral surface of the throttle portion 32 of the outer cylinder 3, An adhesive is applied to the outer peripheral surface of the upper end portion of the small diameter portion 30 of the outer cylinder 3 and the inner peripheral surface of the side opening 35, and the adhesive is applied to the outer peripheral surface of the inner cylinder 2. Thereafter, the rubber elastic body 4 is vulcanized by pouring vulcanized rubber into the mold, and the inner peripheral covering rubber 33, the outer peripheral sealing rubber 34, and the membrane 36 are vulcanized integrally with the rubber elastic body 4, respectively. Mold. Then, the mold is removed after the rubber elastic body 4 and the inner peripheral covering rubber 33 are cured.

一方、仕切り部材７を組み立てる工程を行う。詳しく説明すると、オリフィス部材７０の軸受け部８０に軸部材７９の下端部を嵌合させてシリンダ室７６内に軸部材７９を起立させるとともに、シリンダ室７６の底面に緩衝部材７５を配置する。その後、付勢部材７２の内側に軸部材７９を挿入させつつ付勢部材７２をシリンダ室７６内に配置し、付勢部材７２の下端をオリフィス部材７０の底板部７８の凹部７８ａに嵌合させる。続いて、ピストン７１の筒部７１ａの内側に軸部材７９を挿入させつつピストン７１をシリンダ室７６内に配置し、ピストン７１の筒部７１ａの下端部を付勢部材７２の上端部の内側に嵌合させる。一方、蓋部材７３に逆止弁７４を装着させる。すなわち、逆止弁７４の嵌合部７４ｃを蓋部材７３の嵌合孔７３ｄに嵌合させ、蓋部材７３の天壁部７３ｂの下方に逆止弁７４を吊持させる。その後、蓋部材７３の周壁部７３ｃをオリフィス部材７０の被圧入部８８の外側に圧入嵌合させて蓋部材７３をオリフィス部材７０の上端に被着させる。このとき、逆止弁７４の外周部７４ａが、オリフィス部材７０の上端面と蓋部材７３の天壁部７３ｂとの間に挟まれ、逆止弁７４の弁体部７４ｂ及び連結部７４ｄが弾性変形して弁体部７４ｂの上面が蓋部材７３の天壁部７３ｂの下面に押し付けられる。これにより、上記天壁部７３ｂに形成された連通孔７３ａが弁体部７４ｂにより閉塞される。また、このとき、逆止弁７４の凹部７４ｅの内側に軸部材７９の上端が嵌合され、軸部材７９の上端が軸支される。以上により、仕切り部材７が組み立てられる。   On the other hand, the process of assembling the partition member 7 is performed. More specifically, the lower end portion of the shaft member 79 is fitted to the bearing portion 80 of the orifice member 70 to erect the shaft member 79 in the cylinder chamber 76, and the buffer member 75 is disposed on the bottom surface of the cylinder chamber 76. Thereafter, while the shaft member 79 is inserted inside the urging member 72, the urging member 72 is disposed in the cylinder chamber 76, and the lower end of the urging member 72 is fitted into the recess 78 a of the bottom plate portion 78 of the orifice member 70. . Subsequently, the piston 71 is arranged in the cylinder chamber 76 while the shaft member 79 is inserted inside the cylinder portion 71 a of the piston 71, and the lower end portion of the cylinder portion 71 a of the piston 71 is placed inside the upper end portion of the biasing member 72. Fit. On the other hand, the check valve 74 is attached to the lid member 73. That is, the fitting portion 74 c of the check valve 74 is fitted into the fitting hole 73 d of the lid member 73, and the check valve 74 is suspended below the top wall portion 73 b of the lid member 73. Thereafter, the peripheral wall portion 73 c of the lid member 73 is press-fitted to the outside of the press-fit portion 88 of the orifice member 70, and the lid member 73 is attached to the upper end of the orifice member 70. At this time, the outer peripheral portion 74a of the check valve 74 is sandwiched between the upper end surface of the orifice member 70 and the top wall portion 73b of the lid member 73, and the valve body 74b and the connecting portion 74d of the check valve 74 are elastic. The upper surface of the valve body portion 74 b is pressed against the lower surface of the top wall portion 73 b of the lid member 73 by deformation. Thereby, the communication hole 73a formed in the top wall portion 73b is closed by the valve body portion 74b. At this time, the upper end of the shaft member 79 is fitted inside the recess 74e of the check valve 74, and the upper end of the shaft member 79 is pivotally supported. Thus, the partition member 7 is assembled.

次に、上記した仕切り部材７を外筒３の内側に嵌合する工程を行う。詳しく説明すると、仕切り部材７を外筒３の下端側から外筒３の小径部３０の内側に圧入させる。これにより、オリフィス部材７０の第一溝８２、第二溝８３、及び副液室側連通路８５の外周側の開口が内周被覆ゴム３３によって閉塞されるとともに、主液室側連通路８４の外周側の開口がメンブラン３６によって閉塞される。また、ゴム弾性体４の下面と蓋部材７３の上面との間に主液室６Ａが形成される。   Next, a step of fitting the partition member 7 described above inside the outer cylinder 3 is performed. More specifically, the partition member 7 is press-fitted from the lower end side of the outer cylinder 3 into the small diameter portion 30 of the outer cylinder 3. As a result, the openings on the outer peripheral side of the first groove 82, the second groove 83, and the auxiliary liquid chamber side communication path 85 of the orifice member 70 are closed by the inner peripheral covering rubber 33, and the main liquid chamber side communication path 84 The opening on the outer peripheral side is closed by the membrane 36. A main liquid chamber 6 </ b> A is formed between the lower surface of the rubber elastic body 4 and the upper surface of the lid member 73.

次に、ダイヤフラム５を外筒３の下端部の内側に嵌合する工程を行う。詳しく説明すると、ダイヤフラム５のダイヤフラムリング５０を外筒３の小径部３０の下端部の内側に圧入させた後、小径部３０の下端を径方向内側に向けて縮径変形させてダイヤフラムリング５０を外筒３にカシメ固定する。これにより、外筒３の下端が閉塞されてダイヤフラム５のダイヤフラムゴム５１の上面とオリフィス部材７０の下面との間に副液室６Ｂが形成される。   Next, the process of fitting the diaphragm 5 inside the lower end portion of the outer cylinder 3 is performed. More specifically, after the diaphragm ring 50 of the diaphragm 5 is press-fitted inside the lower end portion of the small-diameter portion 30 of the outer cylinder 3, the lower end of the small-diameter portion 30 is reduced in diameter toward the radially inner side to deform the diaphragm ring 50. The outer cylinder 3 is caulked and fixed. Thereby, the lower end of the outer cylinder 3 is closed, and a sub liquid chamber 6 </ b> B is formed between the upper surface of the diaphragm rubber 51 of the diaphragm 5 and the lower surface of the orifice member 70.

次に、液室６内に液体を封入する工程を行う。詳しく説明すると、図示せぬ液体注入口から液室６内に液体を注入して液室６内に液体を充填し、その後、前記液体注入口を閉塞させて液室６を封止する。このとき、メンブラン３６とゴム弾性体４（内周被覆ゴム３３）とが一体に形成されているため、メンブラン３６のシール性が向上しており、外筒３の側面開口部３５がメンブラン３６によって確実に閉塞されている。   Next, a step of enclosing the liquid in the liquid chamber 6 is performed. More specifically, a liquid is injected into the liquid chamber 6 from a liquid injection port (not shown), the liquid chamber 6 is filled with the liquid, and then the liquid injection port is closed to seal the liquid chamber 6. At this time, since the membrane 36 and the rubber elastic body 4 (inner peripheral covering rubber 33) are integrally formed, the sealing performance of the membrane 36 is improved, and the side opening 35 of the outer cylinder 3 is formed by the membrane 36. It is securely blocked.

次に、外筒３を車体側ブラケット１０のホルダー部１１内に圧入嵌合する工程を行う。これにより、外筒３の大径部３１がホルダー部１１の小径部１３の内側に配置されるとともに、外筒３の外周シールゴム３４の外周面がホルダー部１１の小径部１３の内周面に圧接され、ホルダー部１１の大径部１４の内周面と外筒３の外周面（メンブラン３６の外側面）との間に形成された隙間Ｓの上側が閉塞される。   Next, a step of press-fitting the outer cylinder 3 into the holder portion 11 of the vehicle body side bracket 10 is performed. As a result, the large diameter portion 31 of the outer cylinder 3 is disposed inside the small diameter portion 13 of the holder portion 11, and the outer peripheral surface of the outer peripheral seal rubber 34 of the outer cylinder 3 is aligned with the inner peripheral surface of the small diameter portion 13 of the holder portion 11. The upper side of the gap S formed between the inner peripheral surface of the large-diameter portion 14 of the holder portion 11 and the outer peripheral surface of the outer cylinder 3 (the outer surface of the membrane 36) is closed.

次に、外筒３の外周面とホルダー部１１の内周面との間にシール部材９を嵌合する工程を行う。詳しく説明すると、外筒３の下端側から外筒３の外周面とホルダー部１１の内周面との間にシール部材９を差し込む。このシール部材９は、外周部９０と内周部９１と折り曲げ部９２とからなる断面視略Ｕ字形状に形成されており、外周部９０と内周部９１とが相対的に近づく方向に弾性変形した状態で外筒３の外周面とホルダー部１１の内周面との間に嵌合されているため、シール部材９の弾性力によって、外周部９０の外周面に形成された凸条部９０ａがホルダー部１１の内周面に圧接されるとともに内周部９１の内周面に形成された凸条部９１ａが外筒３の外周面に圧接される。また、内周部９１が外周部９０よりも短くなっているため、まず、外周部９０がホルダー部１１の内周面に沿って差し込まれ、その後、内周部９１が外筒３の外周面に沿って差し込まれる。このように外筒３の外周面とホルダー部１１の内周面との間にシール部材９が嵌合されることにより、メンブラン３６の外側に形成された隙間Ｓの下側がシール部材９によって封止され、その隙間Ｓへの外気の侵入が防止される。   Next, a process of fitting the seal member 9 between the outer peripheral surface of the outer cylinder 3 and the inner peripheral surface of the holder portion 11 is performed. More specifically, the seal member 9 is inserted between the outer peripheral surface of the outer tube 3 and the inner peripheral surface of the holder portion 11 from the lower end side of the outer tube 3. The seal member 9 is formed in a substantially U shape in sectional view including an outer peripheral portion 90, an inner peripheral portion 91, and a bent portion 92, and is elastic in a direction in which the outer peripheral portion 90 and the inner peripheral portion 91 are relatively close to each other. Since it is fitted between the outer peripheral surface of the outer cylinder 3 and the inner peripheral surface of the holder portion 11 in a deformed state, the ridge portion formed on the outer peripheral surface of the outer peripheral portion 90 by the elastic force of the seal member 9 90 a is press-contacted to the inner peripheral surface of the holder portion 11, and a protruding strip portion 91 a formed on the inner peripheral surface of the inner peripheral portion 91 is press-contacted to the outer peripheral surface of the outer cylinder 3. Further, since the inner peripheral portion 91 is shorter than the outer peripheral portion 90, the outer peripheral portion 90 is first inserted along the inner peripheral surface of the holder portion 11, and then the inner peripheral portion 91 is the outer peripheral surface of the outer cylinder 3. Inserted along. Thus, the sealing member 9 is fitted between the outer peripheral surface of the outer cylinder 3 and the inner peripheral surface of the holder portion 11, so that the lower side of the gap S formed on the outer side of the membrane 36 is sealed by the sealing member 9. The outside air is prevented from entering the gap S.

また、上述したようにシール部材９を差し込む際、シール部材９に設けられた係止部９４が車体側ブラケット１０の脚部１２に形成された開口１２ａに弾性係止され、係止部９４の下端面が開口１２ａの下辺部分に当接される。これにより、外筒３の外周面とホルダー部１１の内周面との間に一旦嵌合したシール部材９が抜け落ちようとしても係止部９４が引っ掛かるため、シール部材９が抜け落ちることが防止される。また、上述したように係止部９４によってシール部材９が抜け止めされるとともに、シール部材９に形成されたフランジ部９３の上面がホルダー部１１の下端面に当接されることによってシール部材９の押し込みが規制される。これにより、シール部材９が所定の位置で保持され、外筒３や車体側ブラケット１０に対するシール部材９の相対的な位置決めが行われる。   Further, as described above, when the sealing member 9 is inserted, the locking portion 94 provided on the sealing member 9 is elastically locked to the opening 12 a formed in the leg portion 12 of the vehicle body side bracket 10. The lower end surface is brought into contact with the lower side portion of the opening 12a. Thereby, even if the sealing member 9 once fitted between the outer peripheral surface of the outer cylinder 3 and the inner peripheral surface of the holder portion 11 is about to come off, the locking portion 94 is caught, so that the sealing member 9 is prevented from falling off. The Further, as described above, the sealing member 9 is prevented from coming off by the locking portion 94, and the upper surface of the flange portion 93 formed on the sealing member 9 is brought into contact with the lower end surface of the holder portion 11, whereby the sealing member 9. Intrusion is regulated. As a result, the seal member 9 is held at a predetermined position, and the relative positioning of the seal member 9 with respect to the outer cylinder 3 and the vehicle body side bracket 10 is performed.

次に、上記した防振装置１の作用について説明する。   Next, the operation of the above-described vibration isolator 1 will be described.

上記した構成からなる防振装置１では、車両におけるエンジンからの振動が図示せぬエンジン側ブラケットを介して内筒２に伝達され、さらに内筒２からゴム弾性体４に伝達され、ゴム弾性体４が弾性変形する。このとき、ゴム弾性体４は振動吸収主体として作用し、ゴム弾性体４の内部摩擦等に基づく吸振作用によって振動が吸収され、外筒３から車体側ブラケット１０を介して車体側へ伝達される振動が低減される。   In the vibration isolator 1 having the above-described configuration, vibration from the engine in the vehicle is transmitted to the inner cylinder 2 via an engine-side bracket (not shown), and further transmitted from the inner cylinder 2 to the rubber elastic body 4. 4 is elastically deformed. At this time, the rubber elastic body 4 acts as a vibration absorbing main body, and the vibration is absorbed by the vibration absorbing action based on the internal friction of the rubber elastic body 4 and transmitted from the outer cylinder 3 to the vehicle body side via the vehicle body side bracket 10. Vibration is reduced.

また、上記した防振装置１に、相対的に周波数が低く振幅が大きいシェイク振動が入力されると、このシェイク振動によってゴム弾性体４が弾性変形し、主液室６Ａ内に、相対的に大きな液圧変化が生じ、主液室６Ａ内の液圧は周期的に大きな昇降を繰り返す。
このとき、主液室６Ａ内の周期的な液圧上昇時においては、主液室６Ａ内の液圧がシリンダ室７６の上室（ピストン７１の上方のシリンダ室）内の液圧よりも大きくなるので、逆止弁７４の弁体部７４ｂがその予圧力に抗して押し下げられて蓋部材７３の連通孔７３ａが開放される。このとき、シリンダ室７６の上室内の液圧が付勢部材７２の付勢力（予圧縮力）よりも大きくなるので、ピストン７１が付勢部材７２の付勢力に抗して押し下げられる。これにより、オリフィス部材７０のオリフィス開口８６がピストン７１により閉塞されてアイドルオリフィス８１Ｂが遮断される。その結果、液室６内の液体は、主液室６Ａ内の液圧上昇に伴って主液室６Ａ側からシェイクオリフィス８１Ａを通って副液室６Ｂ側へと流通する。 Further, when a shake vibration having a relatively low frequency and a large amplitude is input to the above-described vibration isolator 1, the rubber elastic body 4 is elastically deformed by the shake vibration and is relatively moved into the main liquid chamber 6A. A large fluid pressure change occurs, and the fluid pressure in the main fluid chamber 6A periodically repeats large elevations.
At this time, when the fluid pressure in the main fluid chamber 6A is periodically increased, the fluid pressure in the main fluid chamber 6A is larger than the fluid pressure in the upper chamber of the cylinder chamber 76 (cylinder chamber above the piston 71). Therefore, the valve body 74b of the check valve 74 is pushed down against the preload, and the communication hole 73a of the lid member 73 is opened. At this time, since the hydraulic pressure in the upper chamber of the cylinder chamber 76 becomes larger than the urging force (precompression force) of the urging member 72, the piston 71 is pushed down against the urging force of the urging member 72. As a result, the orifice opening 86 of the orifice member 70 is closed by the piston 71, and the idle orifice 81B is blocked. As a result, the liquid in the liquid chamber 6 flows from the main liquid chamber 6A side through the shake orifice 81A to the sub liquid chamber 6B side as the liquid pressure in the main liquid chamber 6A increases.

一方、主液室６Ａ内の周期的な液圧低下時においては、主液室６Ａ内の液圧がシリンダ室７６の上室内の液圧よりも小さくなるので、シリンダ室７６の上室内の液圧によって逆止弁７４の弁体部７４ｂが蓋体７３の天壁部７３ｂに押し付けられて蓋部材７３の連通孔７３ａが閉塞される。その結果、シリンダ室７６の上室内の液圧によってピストン７１が押し下げられた状態を維持し、オリフィス部材７０のオリフィス開口８６がピストン７１により閉塞されてアイドルオリフィス８１Ｂが遮断されたままの状態となる。その結果、液室６内の液体は、主液室６Ａ内の液圧低下に伴って副液室６Ｂ側からシェイクオリフィス８１Ａを通って主液室６Ａ側へと流通する。   On the other hand, when the fluid pressure in the main fluid chamber 6A is periodically reduced, the fluid pressure in the main fluid chamber 6A is smaller than the fluid pressure in the upper chamber of the cylinder chamber 76. The valve body 74b of the check valve 74 is pressed against the top wall 73b of the lid 73 by the pressure, and the communication hole 73a of the lid member 73 is closed. As a result, the state where the piston 71 is pushed down by the hydraulic pressure in the upper chamber of the cylinder chamber 76 is maintained, and the orifice opening 86 of the orifice member 70 is closed by the piston 71 and the idle orifice 81B remains blocked. . As a result, the liquid in the liquid chamber 6 flows from the sub liquid chamber 6B side through the shake orifice 81A to the main liquid chamber 6A side as the liquid pressure in the main liquid chamber 6A decreases.

上記したシェイクオリフィス８１Ａはシェイク振動に対応するようにチューニングされているため、上述したように液室６内の液体がシェイクオリフィス８１Ａを通って主液室６Ａと副液室６Ｂとの間を往来する際、当該シェイクオリフィス８１Ａを流通する液体に液柱共振が生じる。このため、防振装置１に入力されたシェイク振動は、シェイクオリフィス８１Ａにおける液柱共振によって減衰され、車体側に伝達されるシェイク振動は低減される。   Since the shake orifice 81A is tuned to cope with shake vibration, as described above, the liquid in the liquid chamber 6 passes between the main liquid chamber 6A and the sub liquid chamber 6B through the shake orifice 81A. In doing so, liquid column resonance occurs in the liquid flowing through the shake orifice 81A. For this reason, the shake vibration input to the vibration isolator 1 is attenuated by the liquid column resonance in the shake orifice 81A, and the shake vibration transmitted to the vehicle body side is reduced.

また、上記した防振装置１に、相対的に周波数が高く振幅が小さいアイドル振動が入力されると、このアイドル振動によってゴム弾性体４が弾性変形し、主液室６Ａ内に、相対的に小さな液圧変化が生じ、主液室６Ａ内の液圧は周期的に小さい昇降を繰り返す。このとき、主液室６Ａ内の周期的な液圧上昇時において、主液室６Ａ内の液圧がシリンダ室７６の上室内の液圧よりも大きくなるが、逆止弁７４の弁体部７４ｂを押し下げるほどの力が生じないため、逆止弁７４の弁体部７４ｂがその予圧力によって蓋部材７３の天壁部７３ｂに押し付けられた状態を保持し、蓋部材７３の連通孔７３ａが閉塞されたままになる。これにより、ピストン７１は付勢部材７２の付勢力により上方に付勢された状態を保持し、オリフィス部材７０のオリフィス開口８６が開口されてアイドルオリフィス８１Ｂが開放される。このとき、シェイクオリフィス８１Ａ及びアイドルオリフィス８１Ｂの両方が、液体が流通可能な状態（開放状態）になっているが、アイドルオリフィス８１Ｂはシェイクオリフィス８１Ａよりも液体の流通抵抗が低く設定されているため、液体はアイドルオリフィス８１Ｂの方に優先的に流通する。したがって、液室６内の液体は、主液室６Ａ内の液圧変化に伴ってアイドルオリフィス８１Ｂを通って主液室６Ａと副液室６Ｂとの間を往来する。
なお、主液室６Ａ内の周期的な液圧低下時においては、主液室６Ａ内の液圧がシリンダ室７６の上室内の液圧よりも小さくなるため、シリンダ室７６の上室内の液圧によって逆止弁７４の弁体部７４ｂが蓋体７３の天壁部７３ｂに押し付けられ、蓋部材７３の連通孔７３ａが逆止弁７４により閉塞されたままになり、オリフィス部材７０のオリフィス開口８６が開口されてアイドルオリフィス８１Ｂが開放される。 Further, when an idle vibration having a relatively high frequency and a small amplitude is input to the vibration isolator 1 described above, the rubber elastic body 4 is elastically deformed by the idle vibration and is relatively moved into the main liquid chamber 6A. A small fluid pressure change occurs, and the fluid pressure in the main fluid chamber 6A repeats a small increase and decrease periodically. At this time, when the fluid pressure in the main fluid chamber 6A is periodically increased, the fluid pressure in the main fluid chamber 6A becomes larger than the fluid pressure in the upper chamber of the cylinder chamber 76. Since the force which pushes down 74b does not arise, the valve body part 74b of the check valve 74 maintains the state pressed against the top wall part 73b of the lid member 73 by the preload, and the communication hole 73a of the lid member 73 Stay blocked. As a result, the piston 71 is kept biased upward by the biasing force of the biasing member 72, the orifice opening 86 of the orifice member 70 is opened, and the idle orifice 81B is opened. At this time, both the shake orifice 81A and the idle orifice 81B are in a state in which the liquid can flow (open state), but the idle orifice 81B has a lower flow resistance of the liquid than the shake orifice 81A. The liquid flows preferentially toward the idle orifice 81B. Accordingly, the liquid in the liquid chamber 6 moves between the main liquid chamber 6A and the sub liquid chamber 6B through the idle orifice 81B in accordance with the change in the liquid pressure in the main liquid chamber 6A.
It should be noted that when the fluid pressure in the main fluid chamber 6A is periodically reduced, the fluid pressure in the main fluid chamber 6A is smaller than the fluid pressure in the upper chamber of the cylinder chamber 76. Due to the pressure, the valve body 74 b of the check valve 74 is pressed against the top wall 73 b of the lid 73, and the communication hole 73 a of the lid member 73 remains blocked by the check valve 74, and the orifice opening of the orifice member 70 86 is opened and the idle orifice 81B is opened.

上記したアイドルオリフィス８１Ｂはアイドル振動に対応するようにチューニングされているため、上述したように液室６内の液体がアイドルオリフィス８１Ｂを通って主液室６Ａと副液室６Ｂとの間を往来する際、当該アイドルオリフィス８１Ｂを流通する液体に液柱共振が生じる。このため、防振装置１に入力されたアイドル振動は、アイドルオリフィス８１Ｂにおける液柱共振によって減衰され、車体側に伝達されるアイドル振動は低減される。   Since the idle orifice 81B is tuned to cope with idle vibration, the liquid in the liquid chamber 6 travels between the main liquid chamber 6A and the sub liquid chamber 6B through the idle orifice 81B as described above. When doing so, liquid column resonance occurs in the liquid flowing through the idle orifice 81B. For this reason, the idle vibration input to the vibration isolator 1 is attenuated by the liquid column resonance in the idle orifice 81B, and the idle vibration transmitted to the vehicle body side is reduced.

また、上記した防振装置１では、バウンド方向に大きな振動が入力されて主液室６Ａの液圧が急激に上昇した後、リバウンド方向に振動が入力されて主液室６Ａが負圧になり、主液室側連通路８４において局所的に急激な液圧変動が起きようとしても、この急激な液圧変動が、高周波領域のバネ低減のためのメンブラン３６によって緩和される。このとき、メンブラン３６の外側の隙間Ｓが空気室になっているため、メンブラン３６が柔軟に変形可能であり、メンブラン３６によって液圧変動が確実に緩和される。また、シール部材９が環状に形成されており、メンブラン３６の外側の隙間Ｓを広くとることが可能であるため、当該隙間Ｓは、外筒３の外周面とホルダー部１１の内周面との間の全周に亘って形成されている。その結果、メンブラン３６が柔軟に変形可能になり、メンブラン３６によって液圧変動がより確実に緩和される。   Further, in the above-described vibration isolator 1, after a large vibration is input in the bounce direction and the liquid pressure in the main liquid chamber 6A suddenly increases, vibration is input in the rebound direction and the main liquid chamber 6A becomes a negative pressure. Even if an abrupt fluid pressure fluctuation locally occurs in the main fluid chamber side communication passage 84, the abrupt fluid pressure fluctuation is alleviated by the membrane 36 for reducing the spring in the high frequency region. At this time, since the outer space S of the membrane 36 is an air chamber, the membrane 36 can be flexibly deformed, and the fluid pressure fluctuation is reliably reduced by the membrane 36. Further, since the seal member 9 is formed in an annular shape and the gap S outside the membrane 36 can be widened, the gap S is formed between the outer peripheral surface of the outer cylinder 3 and the inner peripheral surface of the holder portion 11. Is formed over the entire circumference. As a result, the membrane 36 can be flexibly deformed, and the fluid pressure fluctuation can be more reliably mitigated by the membrane 36.

上記した構成からなる防振装置１によれば、メンブラン３６の外側面とホルダー部１１の内周面との間に形成された隙間Ｓがシール部材９によって封止されるので、メンブラン３６が外気に曝されることを防止することができ、メンブラン３６のオゾン劣化を抑止することができる。   According to the vibration isolator 1 having the above-described configuration, the gap S formed between the outer side surface of the membrane 36 and the inner peripheral surface of the holder portion 11 is sealed by the seal member 9, so that the membrane 36 is outside air. The membrane 36 can be prevented from being deteriorated by ozone.

また、上記した防振装置１によれば、車体側ブラケット１０のホルダー部１１の内側に外筒３を嵌合させた後、外筒３の外周面とホルダー部１１の内周面との間にシール部材９を嵌合させるだけで防振装置１が製作されるので、防振装置１の製造作業が容易であり、コストアップや量産性の低下を抑えることができる。   Further, according to the above-described vibration isolator 1, after the outer cylinder 3 is fitted inside the holder portion 11 of the vehicle body side bracket 10, the outer cylinder 3 and the inner circumferential surface of the holder portion 11 are spaced from each other. Since the vibration isolator 1 is manufactured simply by fitting the seal member 9 to the front, the manufacturing operation of the vibration isolator 1 is easy, and the increase in cost and the decrease in mass productivity can be suppressed.

また、上記した防振装置１によれば、主液室側連通路８４において局所的に急激な液圧変動が生じようとしても、外筒３の側面開口部３５を閉塞するメンブラン３６によってその液圧変動が緩和されるので、キャビテーションの発生を抑制することができる。   Further, according to the vibration isolator 1 described above, even if a sudden fluid pressure fluctuation locally occurs in the main fluid chamber side communication passage 84, the liquid is absorbed by the membrane 36 that closes the side opening 35 of the outer cylinder 3. Since pressure fluctuation is alleviated, the occurrence of cavitation can be suppressed.

また、上記した防振装置１によれば、メンブラン３６の外側面とホルダー部１１の内周面との間に形成された隙間Ｓが空気室になっており、メンブラン３６が柔軟に変形可能になっているため、メンブラン３６によって主液室側連通路８４における液圧変動が確実に緩和され、キャビテーションの発生を確実に抑制することができる。   Further, according to the vibration isolator 1 described above, the gap S formed between the outer surface of the membrane 36 and the inner peripheral surface of the holder portion 11 is an air chamber, so that the membrane 36 can be flexibly deformed. Therefore, the membrane 36 reliably reduces the hydraulic pressure fluctuation in the main fluid chamber side communication passage 84, and can reliably suppress the occurrence of cavitation.

また、上記した防振装置１によれば、シール部材９は、外周部９０と内周部９１と折り曲げ部９２とを備えた構成からなり、外周部９０と内周部９１とが相対的に近づく方向に弾性変形した状態で、外筒３の外周面とホルダー部１１の内周面との間に嵌合されており、このシール部材９の弾性力によって、外周部９０がホルダー部１１の内周面に圧接されるとともに、内周部９１が外筒３の外周面に圧接されているので、シール部材９によるシール性を向上させることができ、メンブラン３６のオゾン劣化をより確実に抑止することができる。   Further, according to the vibration isolator 1 described above, the seal member 9 includes the outer peripheral portion 90, the inner peripheral portion 91, and the bent portion 92, and the outer peripheral portion 90 and the inner peripheral portion 91 are relatively relative to each other. In a state of being elastically deformed in the approaching direction, it is fitted between the outer peripheral surface of the outer cylinder 3 and the inner peripheral surface of the holder portion 11, and the outer peripheral portion 90 of the holder portion 11 is caused by the elastic force of the seal member 9. While being in pressure contact with the inner peripheral surface and the inner peripheral portion 91 being in pressure contact with the outer peripheral surface of the outer cylinder 3, the sealing performance by the seal member 9 can be improved, and ozone deterioration of the membrane 36 is more reliably suppressed. can do.

また、上記した防振装置１によれば、内周部９１が外周部９０よりも短くなっており、外筒３の外周面とホルダー部１１の内周面との間にシール部材９を嵌合させる際、まず、外周部９１がホルダー部１１の内周面に沿って差し込まれ、その後、内周部９１が外筒３の外周面に沿って差し込まれるので、シール部材９を外筒３の外周面とホルダー部１１の内周面との間に嵌合させ易くなる。これにより、防振装置１の製造作業をより一層容易化することができ、防振装置１の量産性を向上させることができる。   Further, according to the vibration isolator 1 described above, the inner peripheral portion 91 is shorter than the outer peripheral portion 90, and the seal member 9 is fitted between the outer peripheral surface of the outer cylinder 3 and the inner peripheral surface of the holder portion 11. When combining, first, the outer peripheral portion 91 is inserted along the inner peripheral surface of the holder portion 11, and then the inner peripheral portion 91 is inserted along the outer peripheral surface of the outer tube 3. It becomes easy to make it fit between the outer peripheral surface of this and the inner peripheral surface of the holder part 11. FIG. Thereby, the manufacturing operation of the vibration isolator 1 can be further facilitated, and the mass productivity of the vibration isolator 1 can be improved.

また、上記した防振装置１によれば、シール部材９が環状に形成されており、メンブラン３６の外側に形成される隙間Ｓを広くとることが可能である。したがって、隙間Ｓを広くとることで、メンブラン３６が柔軟に変形可能になり、メンブラン３６によって主液室側連通路８４における液圧変動が確実に緩和されるので、キャビテーションの発生をより確実に抑制することができる。   Further, according to the vibration isolator 1 described above, the seal member 9 is formed in an annular shape, and the gap S formed outside the membrane 36 can be widened. Therefore, by widening the gap S, the membrane 36 can be flexibly deformed, and the fluid pressure fluctuation in the main fluid chamber side communication passage 84 is reliably mitigated by the membrane 36, so that the occurrence of cavitation is more reliably suppressed. can do.

また、上記した防振装置１によれば、外周部９０の外周面及び内周部９１の内周面に凸条部９０ａ，９１ａがそれぞれ形成されており、シール部材９を外筒３の外周面とホルダー部１１の内周面との間に嵌合させたとき、外周部９０の凸条部９０ａがホルダー部１１の内周面に圧接されるとともに、内周部９１の凸条部９１ａが外筒３の外周面に圧接されるので、シール部材９によるシール性がより一層向上し、メンブラン３６のオゾン劣化をより確実に抑止することができる。   Further, according to the vibration isolator 1 described above, the protrusions 90 a and 91 a are respectively formed on the outer peripheral surface of the outer peripheral portion 90 and the inner peripheral surface of the inner peripheral portion 91, and the seal member 9 is connected to the outer periphery of the outer cylinder 3. When fitted between the surface and the inner peripheral surface of the holder portion 11, the convex portion 90 a of the outer peripheral portion 90 is pressed against the inner peripheral surface of the holder portion 11 and the convex portion 91 a of the inner peripheral portion 91. Is pressed against the outer peripheral surface of the outer cylinder 3, the sealing performance by the sealing member 9 is further improved, and ozone deterioration of the membrane 36 can be more reliably suppressed.

また、上記した防振装置１によれば、車体側ブラケット１０の脚部１２の開口１２ａに弾性係止した係止部９４によって、外筒３の外周面とホルダー部１１の内周面との間に一旦嵌合したシール部材９が抜け止めされるので、メンブラン３６の外側面とホルダー部１１の内周面との間に形成された隙間Ｓを確実に封止することができる。これにより、メンブラン３６のオゾン劣化をより確実に抑止することができる。また、係止部９４によってシール部材９が抜け止めされるとともに、シール部材９に形成されたフランジ部９３の上面がホルダー部１１の下端面に当接されることによってシール部材９の押し込みが規制されることにより、シール部材９の位置決めが行われるので、シール部材９を外筒３の外周面とホルダー部１１の内周面との間に嵌合させ易くなる。これにより、防振装置１の製造作業をより一層容易化することができ、防振装置１の量産性を向上させることができる。   Further, according to the vibration isolator 1 described above, the outer peripheral surface of the outer cylinder 3 and the inner peripheral surface of the holder portion 11 are formed by the locking portion 94 elastically locked to the opening 12 a of the leg portion 12 of the vehicle body side bracket 10. Since the sealing member 9 once fitted therebetween is prevented from coming off, the gap S formed between the outer surface of the membrane 36 and the inner peripheral surface of the holder portion 11 can be reliably sealed. Thereby, ozone deterioration of the membrane 36 can be more reliably suppressed. Further, the sealing member 9 is prevented from coming off by the engaging portion 94 and the upper surface of the flange portion 93 formed on the sealing member 9 is brought into contact with the lower end surface of the holder portion 11 to restrict the pushing of the sealing member 9. By doing so, since the sealing member 9 is positioned, the sealing member 9 can be easily fitted between the outer peripheral surface of the outer cylinder 3 and the inner peripheral surface of the holder portion 11. Thereby, the manufacturing operation of the vibration isolator 1 can be further facilitated, and the mass productivity of the vibration isolator 1 can be improved.

また、上記した防振装置１によれば、メンブラン３６とゴム弾性体４（内周被覆ゴム３３）とが一体に形成されており、メンブラン３６のシール性が向上されているので、外筒３の側面開口部３５から液室６内の液体が漏出することを確実に防止することができる。   Further, according to the above-described vibration isolator 1, the membrane 36 and the rubber elastic body 4 (inner peripheral covering rubber 33) are integrally formed, and the sealing performance of the membrane 36 is improved. It is possible to reliably prevent the liquid in the liquid chamber 6 from leaking from the side opening 35.

以上、本発明に係る防振装置の実施の形態について説明したが、本発明は上記した実施の形態に限定されるものではなく、その趣旨を逸脱しない範囲で適宜変更可能である。
例えば、上記した実施の形態では、内筒２に、振動発生源である図示せぬエンジンがエンジン側ブラケットを介して連結され、外筒３に、振動受部である図示せぬ車体が車体側ブラケット１０を介して連結されているが、本発明は、内筒２（取付部材）に振動受部が連結され、外筒３（筒部材）にブラケット１０を介して振動発生源が連結されていてもよい。 As mentioned above, although the embodiment of the vibration isolator according to the present invention has been described, the present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the gist thereof.
For example, in the above-described embodiment, an engine (not shown) that is a vibration generation source is connected to the inner cylinder 2 via an engine side bracket, and a vehicle body (not shown) that is a vibration receiving portion is connected to the outer cylinder 3 on the vehicle body side. In the present invention, the vibration receiving portion is connected to the inner cylinder 2 (mounting member), and the vibration generating source is connected to the outer cylinder 3 (cylinder member) via the bracket 10. May be.

また、上記した実施の形態では、車両のエンジンマウントとして適用される防振装置１について説明しているが、本発明に係る防振装置はエンジンマウント以外に適用することも可能である。例えば、本発明に係る防振装置を、建設機械に搭載された発電機のマウントとして適用することも可能であり、或いは、工場等に設置される機械のマウントとして適用することも可能である。   Moreover, although the above-described embodiment describes the vibration isolator 1 that is applied as an engine mount of a vehicle, the vibration isolator according to the present invention can be applied to other than the engine mount. For example, the vibration isolator according to the present invention can be applied as a mount of a generator mounted on a construction machine, or can be applied as a mount of a machine installed in a factory or the like.

また、上記した実施の形態では、外筒３と同軸上に内筒２が配設され、この内筒２の雌ねじ部２ａに図示せぬボルトを螺着させて内筒２に図示せぬエンジン側ブラケットを取り付ける構成になっているが、本発明は、内筒２の内側にエンジン側ブラケットの圧入部が圧入される構成であってもよい。また、内筒２が外筒３と直交する方向に延設され、内筒２の内側に図示せぬエンジン側ブラケットのボルトが挿入されてナット等で機械的に固定される構成であってもよい。さらに、本発明は、筒形状の取付部材に限定されず、例えば、取付部材が、ボルトが突設された構成からなり、前記ボルトによってエンジン側ブラケット等に取り付ける構成であってよい。   Further, in the above-described embodiment, the inner cylinder 2 is disposed coaxially with the outer cylinder 3, and a bolt (not shown) is screwed onto the female thread portion 2 a of the inner cylinder 2 so that the engine (not shown) is attached to the inner cylinder 2. Although the configuration is such that the side bracket is attached, the present invention may be configured such that the press-fit portion of the engine-side bracket is press-fitted inside the inner cylinder 2. Further, the inner cylinder 2 extends in a direction perpendicular to the outer cylinder 3, and a bolt of an engine side bracket (not shown) is inserted inside the inner cylinder 2 and mechanically fixed with a nut or the like. Good. Furthermore, the present invention is not limited to a cylindrical mounting member, and for example, the mounting member may have a configuration in which a bolt protrudes and may be configured to be mounted on an engine side bracket or the like with the bolt.

また、上記した実施の形態では、オリフィス部材７０にシェイクオリフィス８１Ａとアイドルオリフィス８１Ｂとがそれぞれ形成されているとともに、オリフィス部材７０に形成されたシリンダ室７６内にピストン７１や付勢部材７２、逆止弁７４等がそれぞれ収容され、さらにシリンダ室７６が蓋部材７３によって覆われた構成の、いわゆる液圧切換式の防振装置１について説明しているが、本発明は、上述したような液圧切換式の防振装置１に限定されるものではない。例えば、ピストン７１や付勢部材７２、蓋部材７３、逆止弁７４等が備えられてなく、一つのオリフィス通路を有するオリフィス部材（仕切り部材）によって液室６が主液室６Ａと副液室６Ｂとに区分けされた構成の防振装置であってもよい。   In the above-described embodiment, the orifice member 70 is formed with the shake orifice 81A and the idle orifice 81B, and the piston 71 and the biasing member 72 are reversed in the cylinder chamber 76 formed in the orifice member 70. The so-called hydraulic pressure switching type vibration isolator 1 having a configuration in which the stop valve 74 and the like are accommodated and the cylinder chamber 76 is covered with the lid member 73 has been described. It is not limited to the pressure switching type vibration isolator 1. For example, the piston 71, the urging member 72, the lid member 73, the check valve 74, and the like are not provided, and the liquid chamber 6 is divided into the main liquid chamber 6A and the sub liquid chamber by an orifice member (partition member) having one orifice passage. The anti-vibration device may be divided into 6B.

また、上記した実施の形態では、外筒３の外周面に外周シールゴム３４が全周に亘って周設されており、また、外筒３の下端部の外周面とホルダー部１１の下端部の内周面との間にシール部材９が嵌合されており、メンブラン３６の外側に形成された隙間Ｓの上側が外周シールゴム３４で閉塞され、上記隙間Ｓの下側がシール部材９で閉塞された構成になっているが、本発明は、シール部材９が上記隙間Ｓの上側（外筒３の一方の開放端側）を閉塞した構成であってもよい。例えば、外筒３の上端部の外周面とホルダー部１１の上端部の内周面との間、及び、外筒３の下端部の外周面とホルダー部１１の下端部の内周面との間に、それぞれシール部材９が嵌合され、上記隙間Ｓの上側及び下側がそれぞれシール部材９により閉塞された構成であってもよい。また、外筒３の上端部の外周面とホルダー部１１の上端部の内周面との間にシール部材９が嵌合されて上記隙間Ｓの上側が閉塞されるとともに、外筒３の下端部の外周面に外周シールゴム３４が周設され、この外周シールゴム３４で上記隙間Ｓの下側が閉塞された構成であってもよい。   Further, in the above-described embodiment, the outer peripheral seal rubber 34 is provided on the outer peripheral surface of the outer cylinder 3 over the entire periphery, and the outer peripheral surface of the lower end portion of the outer cylinder 3 and the lower end portion of the holder portion 11 are provided. The seal member 9 is fitted between the inner peripheral surface, the upper side of the gap S formed outside the membrane 36 is closed by the outer peripheral seal rubber 34, and the lower side of the gap S is closed by the seal member 9. Although configured, the present invention may be configured such that the seal member 9 closes the upper side of the gap S (one open end side of the outer cylinder 3). For example, between the outer peripheral surface of the upper end portion of the outer cylinder 3 and the inner peripheral surface of the upper end portion of the holder portion 11, and between the outer peripheral surface of the lower end portion of the outer tube 3 and the inner peripheral surface of the lower end portion of the holder portion 11. The seal member 9 may be fitted in between, and the upper side and the lower side of the gap S may be closed by the seal member 9. Further, the seal member 9 is fitted between the outer peripheral surface of the upper end portion of the outer cylinder 3 and the inner peripheral surface of the upper end portion of the holder portion 11 to close the upper side of the gap S, and the lower end of the outer cylinder 3 An outer peripheral seal rubber 34 may be provided around the outer peripheral surface of the portion, and the lower side of the gap S may be closed by the outer peripheral seal rubber 34.

また、上記した実施の形態では、上記隙間Ｓが外筒３の全周に亘って形成されているが、本発明は、上記隙間が全周に亘って形成されてなく、外筒３の周方向の一部にだけ上記隙間が形成されていてもよい。例えば、メンブラン３６の外側にだけ隙間が形成された構成であってもよい。この場合、隙間の周方向の両側は、外筒３の外周面に設けられたゴムシール等で閉塞する。
また、上記した実施の形態では、上記隙間Ｓは空気室になっているが、本発明は、隙間Ｓに液体を充填することも可能である。 In the embodiment described above, the gap S is formed over the entire circumference of the outer cylinder 3, but the present invention does not form the gap over the entire circumference. The gap may be formed only in a part of the direction. For example, a configuration in which a gap is formed only outside the membrane 36 may be used. In this case, both sides in the circumferential direction of the gap are closed by rubber seals or the like provided on the outer peripheral surface of the outer cylinder 3.
In the embodiment described above, the gap S is an air chamber. However, in the present invention, the gap S can be filled with liquid.

また、上記した実施の形態では、外周部９０と内周部９１と折り曲げ部９２とにより断面視略Ｕ字形状に形成された環状のシール部材９が用いられており、さらに、内周部９１が外周部９０よりも短くなっているが、本発明は、内周部及び外周部の外筒軸線方向の長さが同じになっているシール部材を用いることも可能であり、或いは、内周部が外周部よりも長いシール部材を用いることも可能である。
また、本発明は、断面視略Ｕ字形状のシール部材９に限定されず、他の形状のシール部材を用いることも可能である。例えば、断面視Ｓ字形状のシール部材であってもよく、この場合、シール部材は径方向に圧縮されて弾性変形した状態で外筒３の外周面とホルダー部１１の内周面との間に嵌合され、断面視Ｓ字形状のシール部材のうち、径方向外側に膨出した一方の円弧部分がホルダー部１１の内周面に圧接され、径方向内側に膨出した他方の円弧部分が外筒３の外周面に圧接される。さらに、本発明は、断面視形状が矩形、円形、或いはその他の形状のシール部材を用いることも可能である。
さらに、本発明は、環状のシール部材９に限定されるものではなく、例えば、外筒３の外周面に沿って延びた円弧状のシール部材を用いることも可能である。 Further, in the above-described embodiment, the annular seal member 9 formed in a substantially U shape in sectional view by the outer peripheral portion 90, the inner peripheral portion 91, and the bent portion 92 is used. However, in the present invention, it is possible to use a seal member in which the inner peripheral portion and the outer peripheral portion have the same length in the outer cylinder axis direction, or the inner peripheral portion It is also possible to use a seal member whose part is longer than the outer peripheral part.
Further, the present invention is not limited to the seal member 9 having a substantially U shape in cross section, and seal members having other shapes can also be used. For example, a seal member having an S-shape in cross section may be used. In this case, the seal member is compressed between the outer peripheral surface of the outer cylinder 3 and the inner peripheral surface of the holder portion 11 in a state of being elastically deformed by being compressed in the radial direction. One of the arcuate portions of the S-shaped sealing member that is fitted into the outer circumferential surface and bulges radially outward is pressed against the inner peripheral surface of the holder portion 11 and bulges radially inward. Is pressed against the outer peripheral surface of the outer cylinder 3. Furthermore, the present invention can use a sealing member having a rectangular, circular, or other shape in cross-sectional view.
Furthermore, the present invention is not limited to the annular seal member 9. For example, an arc-shaped seal member extending along the outer peripheral surface of the outer cylinder 3 can be used.

また、上記した実施の形態では、シール部材９の外側面（外周部９０の外周面）及び内側面（内周部９１の内周面）にそれぞれ凸条部９０ａ，９１ａがそれぞれ形成されているが、本発明は、シール部材の外側面及び内側面のうちの何れか一方にだけ凸条部が形成されたシール部材を用いることも可能であり、或いは、凸条部が形成されていないシール部材を用いることも可能である。   Further, in the above-described embodiment, the protrusions 90a and 91a are formed on the outer surface (the outer peripheral surface of the outer peripheral portion 90) and the inner surface (the inner peripheral surface of the inner peripheral portion 91) of the seal member 9, respectively. However, according to the present invention, it is also possible to use a seal member in which a ridge is formed only on one of the outer surface and the inner surface of the seal member, or a seal in which no ridge is formed. It is also possible to use a member.

また、上記した実施の形態では、車体側ブラケット１０の脚部１２の開口１２ａに弾性係止される係止部９４がシール部材９に備えられているが、本発明は、シール部材に備えられた係止部がブラケットに弾性係止される構成に限定されず、シール部材に備えられた係止部が外筒３（筒部材）に弾性係止された構成にすることも可能である。また、本発明は、上記した係止部９４が備えられていない構成にすることも可能である。   Further, in the above-described embodiment, the sealing member 9 is provided with the locking portion 94 that is elastically locked to the opening 12a of the leg portion 12 of the vehicle body side bracket 10, but the present invention is provided in the sealing member. It is also possible to adopt a configuration in which the locking portion provided in the seal member is elastically locked to the outer cylinder 3 (cylindrical member). Further, the present invention can be configured such that the above-described locking portion 94 is not provided.

また、上記した実施の形態では、外筒３の側面開口部３５を閉塞するメンブラン３６がゴム弾性体４（内周被覆ゴム３３）と一体に形成されているが、本発明は、メンブラン３６がゴム弾性体４や内周被覆ゴム３３と切り離された構成にすることも可能である。   Further, in the above-described embodiment, the membrane 36 that closes the side opening 35 of the outer cylinder 3 is formed integrally with the rubber elastic body 4 (inner peripheral covering rubber 33). A configuration separated from the rubber elastic body 4 and the inner peripheral covering rubber 33 is also possible.

その他、本発明の主旨を逸脱しない範囲で、上記した実施の形態における構成要素を周知の構成要素に置き換えることは適宜可能であり、また、上記した変形例を適宜組み合わせてもよい。   In addition, in the range which does not deviate from the main point of this invention, it is possible to replace suitably the component in above-mentioned embodiment with a well-known component, and you may combine the above-mentioned modification suitably.

本発明の実施の形態を説明するための防振装置の断面図である。It is sectional drawing of the vibration isolator for demonstrating embodiment of this invention. 本発明の実施の形態を説明するためのシール部材の斜視図である。It is a perspective view of a seal member for explaining an embodiment of the invention. 本発明の実施の形態を説明するためのシール部材の断面図である。It is sectional drawing of the sealing member for demonstrating embodiment of this invention. 本発明の実施の形態を説明するための防振装置の部分斜視図である。It is a fragmentary perspective view of the vibration isolator for demonstrating embodiment of this invention. 本発明の実施の形態を説明するための仕切り部材の分解斜視図である。It is a disassembled perspective view of the partition member for demonstrating embodiment of this invention.

符号の説明Explanation of symbols

１ 防振装置
２ 内筒（取付部材）
３ 外筒（筒部材）
４ ゴム弾性体
５ ダイヤフラム
６ 液室
６Ａ 主液室
６Ｂ 副液室
７ 仕切り部材
９ シール部材
１０ 車体側ブラケット（ブラケット）
１１ ホルダー部
３５ 側面開口部
３６ メンブラン
８１ オリフィス通路
８４ 主液室側連通路（連通部分）
９０ 外周部
９０ａ 凸条部
９１ 内周部
９１ａ 凸条部
９２ 折り曲げ部
９４ 係止部
Ｓ 隙間 1 Antivibration device 2 Inner cylinder (mounting member)
3 Outer cylinder (cylinder member)
4 Rubber elastic body 5 Diaphragm 6 Liquid chamber 6A Main liquid chamber 6B Sub liquid chamber 7 Partition member 9 Seal member 10 Car body side bracket (bracket)
11 Holder 35 Side opening 36 Membrane 81 Orifice passage 84 Main liquid chamber side communication passage (communication portion)
90 outer peripheral part 90a convex part 91 inner peripheral part 91a convex part 92 bent part 94 locking part S gap

Claims (6)

振動発生部および振動受部のうちの何れか一方に連結されるブラケットと、
該ブラケットの筒状のホルダー部の内側に嵌合された筒部材と、
前記振動発生部および前記振動受部のうちの何れか他方に連結される取付部材と、
前記筒部材と前記取付部材とを弾性的に連結するとともに前記筒部材の一方の開口端を閉塞するゴム弾性体と、
前記筒部材の他方の開口端を閉塞するダイヤフラムと、
前記筒部材の内側に形成されて液体が封入された液室を、隔壁の一部が前記ゴム弾性体で形成されて前記ゴム弾性体の変形により内容積が変化する主液室と、隔壁の一部が前記ダイヤフラムで形成された副液室と、に区画するとともに、前記主液室と前記副液室とを連通するオリフィス通路を有する仕切り部材と、
を備える防振装置において、
前記筒部材において前記オリフィス通路と前記主液室との連通部分に隣接する部分に側面開口部が形成されているとともに、前記主液室の内圧の変化に応じて変形可能なメンブランが前記側面開口部を閉塞するように張設されており、
前記メンブランの外側面と前記ホルダー部の内周面との間に、隙間があけられており、
前記筒部材の外周面と前記ホルダー部の内周面との間に、前記隙間を封止するシール部材が嵌合され、
前記隙間が空気室になっていて、
前記シール部材は、前記ホルダー部の内周面に圧接する外周部と、前記筒部材の外周面に圧接する内周部と、前記外周部の端部と前記内周部の端部とを連結する折り曲げ部と、を備えており、前記内周部と前記外周部とが相対的に近づく方向に弾性変形した状態で、前記筒部材の外周面と前記ホルダー部の内周面との間に嵌合されていることを特徴とする防振装置。 A bracket coupled to either one of the vibration generator and the vibration receiver;
A cylindrical member fitted inside the cylindrical holder portion of the bracket;
An attachment member connected to any one of the vibration generating portion and the vibration receiving portion;
A rubber elastic body that elastically connects the cylindrical member and the mounting member and closes one open end of the cylindrical member;
A diaphragm for closing the other open end of the cylindrical member;
A liquid chamber formed inside the cylindrical member and enclosing a liquid, a main liquid chamber in which a part of the partition wall is formed of the rubber elastic body, and the internal volume changes due to deformation of the rubber elastic body, and a partition wall A partition member partially partitioned into a secondary liquid chamber formed of the diaphragm, and having an orifice passage communicating the main liquid chamber and the secondary liquid chamber;
In a vibration isolator comprising:
A side opening is formed in a portion of the cylindrical member adjacent to the communicating portion between the orifice passage and the main liquid chamber, and a membrane that can be deformed in accordance with a change in the internal pressure of the main liquid chamber is formed in the side opening. Stretched to block the part,
There is a gap between the outer surface of the membrane and the inner peripheral surface of the holder part,
A seal member for sealing the gap is fitted between the outer peripheral surface of the cylindrical member and the inner peripheral surface of the holder part ,
The gap is an air chamber,
The seal member connects an outer peripheral portion pressed against the inner peripheral surface of the holder portion, an inner peripheral portion pressed against the outer peripheral surface of the cylindrical member, and an end portion of the outer peripheral portion and an end portion of the inner peripheral portion. A bent portion that is elastically deformed in a direction in which the inner peripheral portion and the outer peripheral portion relatively approach each other, and between the outer peripheral surface of the cylindrical member and the inner peripheral surface of the holder portion. A vibration isolator characterized by being fitted . 請求項１記載の防振装置において、
前記内周部は、前記筒部材の軸線方向の長さが前記外周部よりも短くなっていることを特徴とする防振装置。 The vibration isolator according to claim 1 , wherein
The anti-vibration device according to claim 1, wherein the inner peripheral portion has a length in the axial direction of the cylindrical member that is shorter than the outer peripheral portion. 請求項１または２に記載の防振装置において、
前記シール部材は、前記筒部材の外周面に沿って環状に形成されていることを特徴とする防振装置。 In the vibration isolator according to claim 1 or 2 ,
The vibration isolator, wherein the seal member is formed in an annular shape along the outer peripheral surface of the cylindrical member. 請求項１から３のいずれか１項に記載の防振装置において、
前記シール部材において前記筒部材の外周面に対向する内側面及び前記ホルダー部の内周面に対向する外側面のうちの少なくとも一方には、前記シール部材の全長に亘って延在する凸条部が突設されていることを特徴とする防振装置。 The vibration isolator according to any one of claims 1 to 3 ,
In at least one of the inner surface facing the outer peripheral surface of the cylindrical member and the outer surface facing the inner peripheral surface of the holder portion in the seal member, a ridge portion extending over the entire length of the seal member The vibration isolator characterized by the fact that is projected. 請求項１から４のいずれか１項に記載の防振装置において、
前記シール部材には、前記筒部材及び前記ブラケットのうちの何れか一方に弾性係止される係止部が備えられていることを特徴とする防振装置。 Vibration damping device according to any one of claims 1 to 4,
The vibration isolator according to claim 1, wherein the seal member includes a locking portion that is elastically locked to one of the cylindrical member and the bracket. 請求項１から５のいずれか１項に記載の防振装置において、
前記メンブランと前記ゴム弾性体とが一体に形成されていることを特徴とする防振装置。 The vibration isolator according to any one of claims 1 to 5 ,
The vibration isolator is characterized in that the membrane and the rubber elastic body are integrally formed.
JP2008149905A 2008-06-06 2008-06-06 Vibration isolator Expired - Fee Related JP5156489B2 (en)

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JP2002122176A (en) * 2000-10-17 2002-04-26 Bridgestone Corp Vibration isolator method of manufacturing vibration isolator
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