JP3951059B2

JP3951059B2 - Liquid-filled vibration isolator

Info

Publication number: JP3951059B2
Application number: JP2005020440A
Authority: JP
Inventors: 孝則平岡
Original assignee: Toyo Tire and Rubber Co Ltd
Current assignee: Toyo Tire Corp
Priority date: 2004-03-12
Filing date: 2005-01-27
Publication date: 2007-08-01
Anticipated expiration: 2025-01-27
Also published as: JP2006266272A

Description

本発明は、液封入式防振装置に関し、特に、低周波大振幅の振動と高周波微振幅の振動に対して、ともに良好な防振効果を発揮することのできる液封入式防振装置に関する。 The present invention relates to a liquid-filled vibration isolator, and more particularly to a liquid-filled vibration isolator that can exhibit a good vibration-proof effect against both low-frequency large-amplitude vibrations and high-frequency small-amplitude vibrations.

従来、例えば、自動車のトランスミッションと車体フレームとの間に設けられる液封入式防振装置として、第１取付け具と、筒状の第２取付け具と、これらを連結するゴム状弾性体からなる防振基体と、前記第２取付け具に取り付けられて防振基体との間に液体封入室を形成するダイヤフラムと、前記液体封入室を防振基体側の第１液室とダイヤフラム側の第２液室に仕切る仕切り体と、これら第１液室と第２液室を連通させるオリフィスとを備え、前記仕切り体が、弾性仕切り膜と、この弾性仕切り膜の変位量をその膜面の両側から規制する一対の変位規制部材とからなり、この一対の変位規制部材に開口部がそれぞれ形成された液封入式防振装置が知られている。この防振装置では、走行路面の凹凸に起因して大振幅の振動が生じると、液体がオリフィスを通って両液室間を流動し、その液体流動効果によって振動を減衰させる。一方、微振幅の振動が生じると、両液室間を液体が流通することはなく、弾性仕切り膜が往復動変形し、第１液室の内圧を吸収して振動を減衰させる。 2. Description of the Related Art Conventionally, for example, as a liquid-filled vibration isolator provided between an automobile transmission and a vehicle body frame, a first mounting tool, a cylindrical second mounting tool, and a rubber-like elastic body that connects them are used. A diaphragm which is attached to the second base fixture and forms a liquid sealing chamber between the vibration isolating base, a first liquid chamber on the side of the vibration isolating base, and a second liquid on the side of the diaphragm. A partition body for partitioning the chamber, and an orifice for communicating the first liquid chamber and the second liquid chamber. The partition body regulates an elastic partition membrane and a displacement amount of the elastic partition membrane from both sides of the membrane surface. 2. Description of the Related Art There is known a liquid-filled vibration isolator that includes a pair of displacement regulating members that have openings formed in the pair of displacement regulating members. In this vibration isolator, when vibration with a large amplitude occurs due to unevenness of the traveling road surface, the liquid flows between the liquid chambers through the orifice, and the vibration is attenuated by the liquid flow effect. On the other hand, when a vibration with a small amplitude occurs, the liquid does not flow between the two liquid chambers, and the elastic partition film is reciprocally deformed to absorb the internal pressure of the first liquid chamber and attenuate the vibration.

この種の液封入式防振装置では、弾性仕切り膜が変位規制部材に衝突したときに異音が発生しやすい。そこで、特開平６−２２１３６８号公報（特許文献１）に開示されているように、弾性仕切り膜と格子状の変位規制部材との接触面の面積が小さくなるように、変位規制部材に放射状のリブを設ける技術が提案されている。この構成によれば、ある程度異音を低減することができるものの、弾性仕切り膜と変位規制部材との接触面積をあまり小さくすることができず、異音を十分に抑制することができない。また、弾性仕切り膜に第１液室の液体の圧力を伝えるための開口部の面積が変位規制部材の格子部の分だけ狭くなって、第１液室の内圧を吸収しにくい。 In this type of liquid-filled vibration isolator, abnormal noise tends to occur when the elastic partition membrane collides with the displacement regulating member. Therefore, as disclosed in Japanese Patent Application Laid-Open No. 6-221368 (Patent Document 1), the displacement regulating member has a radial shape so that the area of the contact surface between the elastic partition film and the lattice-like displacement regulating member becomes small. Techniques for providing ribs have been proposed. According to this configuration, although abnormal noise can be reduced to some extent, the contact area between the elastic partition film and the displacement regulating member cannot be reduced so much that abnormal noise cannot be sufficiently suppressed. Further, the area of the opening for transmitting the pressure of the liquid in the first liquid chamber to the elastic partition membrane is narrowed by the amount of the lattice portion of the displacement regulating member, so that it is difficult to absorb the internal pressure in the first liquid chamber.

一方、特開２００３−２９４０７８号公報（特許文献２）には、格子状の変位規制部材における貫通孔間における液体のリークを防止するために、弾性仕切り膜の表面に各貫通孔を全周にわたって取り囲む蜘蛛の巣状のリブを設けることが開示されている。この構造では、リブが各貫通孔を全周にわたって取り囲むため、変位規制部材に対する弾性仕切り膜の接触面積が大きく、そのため、動荷重の増加が大きくなって、異音が発生しやすい。 On the other hand, in Japanese Patent Laid-Open No. 2003-294078 (Patent Document 2), in order to prevent leakage of liquid between the through holes in the lattice-shaped displacement regulating member, each through hole is provided on the entire surface of the elastic partition film. It is disclosed to provide surrounding spider web-like ribs. In this structure, since the rib surrounds each through hole over the entire circumference, the contact area of the elastic partition film with the displacement restricting member is large, so that the increase in dynamic load is large and noise is likely to occur.

また、特開２００３−７４６１７号公報（特許文献３）には、オリフィスによる防振効果を十分に確保しつつ、オリフィスのチューニング周波数よりも高周波数域での高動ばね化を抑えるために、弾性仕切り膜を、中央の厚肉部と、外周部の薄肉部と、その外周縁の固定部とで形成し、厚肉部の外周縁部と上記固定部を一対の変位規制部材により全周にわたって厚さ方向に圧縮状態で挟み込むようにした構成が開示されている。この場合、厚肉部の外周縁が変位規制部材により全周にわたって挟持されているため、第１液室の液体の圧力を弾性仕切り膜に伝えるための開口部の有効面積が小さく、また厚肉部が動きにくい。そのため、高周波数域（例えば１００Ｈｚ前後）での動ばね定数が増加して、こもり音が発生しやすい。 Japanese Patent Application Laid-Open No. 2003-74617 (Patent Document 3) discloses an elastic material in order to suppress a high dynamic spring in a frequency range higher than the tuning frequency of the orifice while sufficiently securing the vibration-proofing effect by the orifice. The partition film is formed by a thick portion at the center, a thin portion at the outer peripheral portion, and a fixed portion at the outer peripheral edge thereof, and the outer peripheral edge portion of the thick portion and the fixed portion are extended over the entire circumference by a pair of displacement regulating members. A configuration is disclosed that is sandwiched in a compressed state in the thickness direction. In this case, since the outer peripheral edge of the thick wall portion is sandwiched by the displacement regulating member over the entire circumference, the effective area of the opening for transmitting the pressure of the liquid in the first liquid chamber to the elastic partition membrane is small, and the thick wall portion The part is difficult to move. For this reason, the dynamic spring constant in a high frequency range (for example, around 100 Hz) increases, and a booming noise is likely to occur.

なお、特開平３−１６８４３９号公報（特許文献４）には、弾性仕切り膜の環状の厚肉部の表裏に複数の小突起を周方向に均等に分布させて設け、該小突起を一対の変位規制部材に当接させるようにした構成が開示されている。しかしながら、同文献は、弾性仕切り膜の中央部に切込みを設けた点で本発明とは前提において相違し、しかも厚肉部に変位規制部材に当接させる小突起を設けたものであるため、本発明とは弾性仕切り膜の構成についても、また該弾性仕切り膜と変位規制部材との位置関係についても相違する。 In JP-A-3-168439 (Patent Document 4), a plurality of small protrusions are provided on the front and back of the annular thick part of the elastic partition film so as to be evenly distributed in the circumferential direction. The structure which made it contact | abut to a displacement control member is disclosed. However, this document is different from the present invention in that a cut is provided in the central portion of the elastic partition membrane, and because a small protrusion to be brought into contact with the displacement regulating member is provided in the thick portion, The present invention is also different from the present invention in the configuration of the elastic partition membrane and in the positional relationship between the elastic partition membrane and the displacement regulating member.

また、実開昭６４−３６７３７号公報（特許文献５）には、弾性仕切り膜を中央部の厚肉部とその周囲の薄肉部とで構成することが開示されているが、同文献の防振装置では変位規制部材が設けられておらず、そのため、弾性仕切り膜に設けるリブについてはもちろん、弾性仕切り膜と変位規制部材との位置関係についても開示されていない。
特開平６−２２１３６８号公報特開２００３−２９４０７８号公報特開２００３−７４６１７号公報特開平３−１６８４３９号公報実開昭６４−３６７３７号公報 Japanese Utility Model Laid-Open No. 64-36737 (Patent Document 5) discloses that the elastic partition film is composed of a thick part at the center and a thin part around it. In the vibration device, no displacement restricting member is provided, and therefore, the positional relationship between the elastic partition film and the displacement restricting member is not disclosed as well as the rib provided on the elastic partition film.
JP-A-6-221368 JP 2003-294078 A JP 2003-74617 A Japanese Patent Laid-Open No. 3-168439 Japanese Utility Model Publication No. 64-36737

本発明は、以上の点に鑑みてなされたものであり、変位規制部材への弾性仕切り膜の衝突による異音を十分低減することができるとともに、第１液室の液体の圧力を弾性仕切り膜に伝えるための開口部の面積を大きくして高周波数域での動ばね定数を低減し、更に動荷重の増加を抑えてそれによる異音発生を低減することができる液封入式防振装置を提供することを目的とする。 The present invention has been made in view of the above points, and can sufficiently reduce abnormal noise due to the collision of the elastic partition film with the displacement regulating member, and can reduce the pressure of the liquid in the first liquid chamber. A liquid-sealed anti-vibration device that reduces the dynamic spring constant in the high frequency range by increasing the area of the opening for transmission to the high-frequency region, and further reduces the occurrence of abnormal noise by suppressing the increase in dynamic load The purpose is to provide.

本発明に係る液封入式防振装置は、第１取付け具と、筒状の第２取付け具と、これらを連結するゴム状弾性体からなる防振基体と、前記第２取付け具に取り付けられて前記防振基体との間に液体封入室を形成するダイヤフラムと、前記液体封入室を前記防振基体側の第１液室と前記ダイヤフラム側の第２液室に仕切る仕切り体と、前記第１液室と第２液室を連通させるオリフィスとを備え、前記仕切り体は、弾性仕切り膜と、この弾性仕切り膜の変位量をその膜面の両側から規制する一対の変位規制部材とを備えてなり、前記一対の変位規制部材に、前記弾性仕切り膜の軸心方向視で互いに重複する開口部をそれぞれ形成してある液封入式防振装置であって、
前記開口部は、前記変位規制部材の径方向中央部に形成された第１開口と、この第１開口の周りに分散して形成された複数の第２開口とからなり、
前記弾性仕切り膜は、前記軸心方向視で前記第１開口内に位置する径方向中央部の厚肉部と、この厚肉部の径方向外方側に位置し、前記厚肉部の厚さ方向で前記厚肉部の中間部に位置するとともに前記一対の変位規制部材から離間して位置する薄肉部と、前記変位規制部材に対する外周側の固定部と、前記薄肉部の一方の膜面に設けられて頂部が一方の変位規制部材に当接可能な複数の第１リブと、前記薄肉部の他方の膜面に設けられて頂部が他方の変位規制部材に当接可能な複数の第２リブとからなり、
前記複数の第１リブ及び第２リブが、前記厚肉部に隣接する前記薄肉部の内周縁部において前記厚肉部の外周面から放射状に延設され、これにより、前記薄肉部の内周縁部が前記複数の第１リブ及び第２リブによって周方向に複数に区画され、
前記の区画された各薄肉部部分が、前記軸心方向において前記第１開口に臨んでおり、前記第１開口から該区画された各薄肉部部分に進入してきた液体を第２開口側に導く液体の流路が、前記第１開口と前記第２開口の間の変位規制部材部分とこれに対向する薄肉部部分との間に設けられたものである。 The liquid-filled vibration isolator according to the present invention is attached to the first mounting tool, the cylindrical second mounting tool, the vibration-proof base made of a rubber-like elastic body that connects them, and the second mounting tool. A diaphragm that forms a liquid enclosure chamber between the anti-vibration base, a partition that partitions the liquid enclosure chamber into a first liquid chamber on the anti-vibration base side and a second liquid chamber on the diaphragm side, and An orifice that allows the first liquid chamber and the second liquid chamber to communicate with each other, and the partition includes an elastic partition film and a pair of displacement restricting members that restrict the amount of displacement of the elastic partition film from both sides of the film surface. A liquid-filled vibration isolator in which the pair of displacement regulating members are respectively formed with openings that overlap each other when viewed in the axial direction of the elastic partition membrane,
The opening includes a first opening formed in the radial center of the displacement regulating member and a plurality of second openings formed around the first opening.
The elastic partition membrane is positioned at a radially central portion located in the first opening as viewed in the axial direction and on a radially outward side of the thick portion, and the thickness of the thick portion is A thin portion positioned in the middle of the thick portion and spaced apart from the pair of displacement restricting members, a fixed portion on the outer peripheral side of the displacement restricting member, and one film surface of the thin portion A plurality of first ribs whose tops can come into contact with one displacement regulating member, and a plurality of first ribs that are provided on the other film surface of the thin part and whose tops can come into contact with the other displacement regulating member. It consists of 2 ribs,
The plurality of first ribs and second ribs extend radially from the outer peripheral surface of the thick portion at the inner peripheral portion of the thin portion adjacent to the thick portion, whereby the inner periphery of the thin portion The portion is divided into a plurality of circumferential directions by the plurality of first ribs and second ribs,
Each of the partitioned thin wall portions faces the first opening in the axial direction, and the liquid that has entered the partitioned thin wall portion from the first opening is guided to the second opening side. A liquid flow path is provided between the displacement restricting member portion between the first opening and the second opening and the thin portion facing the displacement restricting member portion.

上記の構成によれば、高周波微振幅の振動が生じた場合、第１液室と第２液室の間を液体が流通することなく、第１液室の液圧が変位規制部材の第１開口を通って弾性仕切り膜の厚肉部に伝わるとともに、第２開口を通って弾性仕切り膜の薄肉部にも伝わり、これにより、厚肉部及び薄肉部が往復動変形し、第１液室の液圧を吸収して高周波微振幅の振動が減衰される。大振幅の振動が生じて第１液室の液圧が所定の値になると、厚肉部及び薄肉部の変形が限界に達し、液体がオリフィスを通って両液室間を流動する。その液流動効果によって低周波大振幅の振動が減衰される。 According to the above configuration, when vibration with high frequency and small amplitude occurs, the liquid does not flow between the first liquid chamber and the second liquid chamber, and the liquid pressure in the first liquid chamber is the first of the displacement regulating member. It is transmitted to the thick part of the elastic partition membrane through the opening and also transmitted to the thin part of the elastic partition membrane through the second opening, whereby the thick part and the thin part are reciprocally deformed, and the first liquid chamber The vibration of the high frequency and fine amplitude is attenuated by absorbing the hydraulic pressure. When large amplitude vibration occurs and the fluid pressure in the first fluid chamber reaches a predetermined value, the deformation of the thick and thin portions reaches the limit, and the liquid flows between the fluid chambers through the orifice. The vibration of the low frequency and large amplitude is attenuated by the liquid flow effect.

そして、特に本発明では、弾性仕切り膜の厚肉部周りの薄肉部部分が第１開口に臨むようにして、第１開口から厚肉部周りの薄肉部部分に進入してきた液体が第２開口側に流れるようにしたので、第１液室の液圧が第１開口を通って薄肉部にも伝わる。すなわち、第１開口の一部も薄肉部を往復動変形させるための高周波オリフィスとして機能させることができる。そのため、第１液室の液体の圧力を弾性仕切り膜に伝えるための開口部の面積を大きくすることができる。また、弾性仕切り膜は、変位規制部材により厚肉部では変位規制されず、厚肉部から延設された放射状のリブのみで変位規制されているので、厚肉部が動きやすい。以上より、高周波数域（例えば１００Ｈｚ前後）での動ばね定数を低減して、こもり音を始めとする高周波微振幅の振動を効果的に減衰することができる。 In particular, in the present invention, the liquid that has entered the thin portion around the thick portion from the first opening to the second opening side so that the thin portion around the thick portion of the elastic partition membrane faces the first opening. Since it was made to flow, the liquid pressure in the first liquid chamber is also transmitted to the thin portion through the first opening. That is, a part of the first opening can also function as a high-frequency orifice for reciprocatingly deforming the thin portion. Therefore, the area of the opening for transmitting the pressure of the liquid in the first liquid chamber to the elastic partition film can be increased. Further, since the elastic partition membrane is not restricted in displacement at the thick portion by the displacement restricting member but is restricted only by the radial ribs extending from the thick portion, the thick portion is easy to move. As described above, the dynamic spring constant in a high frequency range (for example, around 100 Hz) can be reduced, and vibrations with high frequency and small amplitudes such as booming noise can be effectively damped.

また、上記構成によれば、弾性仕切り膜は厚肉部から延設された放射状の第１リブ及び第２リブのみで変位規制されており、弾性仕切り膜の全体が往復動変形することができるので、動荷重の増加を抑えて、異音の発生を抑制することができる。 Further, according to the above configuration, the elastic partition membrane is restricted in displacement only by the radial first rib and the second rib extending from the thick portion, and the entire elastic partition membrane can be reciprocally deformed. Therefore, an increase in dynamic load can be suppressed and the generation of abnormal noise can be suppressed.

また、かかる第１リブと第２リブの頂部が変位規制部材に当接するだけであるため、弾性仕切り膜と変位規制部材との接触面積を十分に小さくすることができ、そのため、変位規制部材への弾性仕切り膜の衝突による異音を十分低減することができる。なお、弾性仕切り膜の固定部も変位規制部材に接触しているが、固定部は変位規制部材に固定されていることから異音発生源とはならない。 Further, since the tops of the first rib and the second rib only abut against the displacement regulating member, the contact area between the elastic partition film and the displacement regulating member can be sufficiently reduced. It is possible to sufficiently reduce abnormal noise caused by the collision of the elastic partition film. In addition, although the fixing | fixed part of an elastic partition film is also contacting the displacement control member, since the fixing | fixed part is being fixed to the displacement control member, it does not become a noise generation source.

なお、弾性仕切り膜を第１液室の液圧の変化に追従変形しやすくしすぎると、大振幅の振動が生じたときに弾性仕切り膜を第１液室の所望の内圧で変位規制するのが困難になり、液体がオリフィスを通りにくくなるが、上記構成によれば、弾性仕切り膜の径方向中央側を厚肉部にして剛性を強くしてあるから、所望の第１液室の液圧で弾性仕切り膜を変位規制しやすくなる。 If the elastic partition membrane is too easily deformed following the change in the hydraulic pressure of the first liquid chamber, the displacement of the elastic partition membrane is restricted by the desired internal pressure of the first liquid chamber when a large amplitude vibration occurs. However, according to the above configuration, the rigidity of the elastic partition membrane is increased by making the radial center of the elastic partition membrane thick, so that the liquid in the desired first liquid chamber can be reduced. Displacement regulation of the elastic partition membrane is facilitated by pressure.

本発明においては、前記弾性仕切り膜の径方向で、前記第１リブ及び第２リブの先端よりも外方側の薄肉部部分が前記一対の変位規制部材の第２開口を臨むように構成してあることが好ましい。これは、第１リブや第２リブを薄肉部の外周縁側にわたる長いリブに設定すると薄肉部の剛性が高くなりすぎ、弾性仕切り膜の中央部に厚肉部が設けられていることとの相乗で、弾性仕切り膜が第１液室の液圧変化に追従しにくくなるからであり、上記のように構成することで、薄肉部で液圧を吸収しやすくなって微振幅の振動を十分吸収することができる。 In the present invention, in the radial direction of the elastic partition membrane, the thin portion on the outer side from the tips of the first rib and the second rib faces the second opening of the pair of displacement regulating members. It is preferable. This is because when the first rib or the second rib is set to be a long rib extending on the outer peripheral edge side of the thin wall portion, the rigidity of the thin wall portion becomes too high and the thick wall portion is provided at the central portion of the elastic partition film. This is because it becomes difficult for the elastic partition membrane to follow the change in the hydraulic pressure in the first liquid chamber. By configuring as described above, the thin wall portion can easily absorb the hydraulic pressure and sufficiently absorb the small amplitude vibration. can do.

本発明においては、また、前記第１開口が円形に、前記厚肉部が円板状に、前記複数の第２開口が前記厚肉部の周方向に沿う円弧状にそれぞれ形成されてもよい。これにより、弾性仕切り膜の形状を簡素化することができる。 In the present invention, the first opening may be formed in a circular shape, the thick portion may be formed in a disc shape, and the plurality of second openings may be formed in an arc shape along a circumferential direction of the thick portion. . Thereby, the shape of an elastic partition film can be simplified.

また、前記複数の第１リブと、前記複数の第２リブと、前記複数の第２開口とは、前記厚肉部の周方向に均等な角度ごとに配置されてもよく、これにより、厚肉部をその周りから均一な力で支持できて、厚肉部に偏った力が加わるのを防止することができる。 Further, the plurality of first ribs, the plurality of second ribs, and the plurality of second openings may be arranged at equal angles in the circumferential direction of the thick portion, thereby increasing the thickness. It is possible to support the meat part with a uniform force from the periphery, and to prevent the biased force from being applied to the thick part.

また、前記第１リブの先端と前記第２リブの先端とが、前記複数の第２開口の内周縁よりも径方向内方側に配置されてもよく、これにより、薄肉部の剛性が高くなりすぎるのをより回避しやすくなり、弾性仕切り膜が第１液室の液圧変化に追従しにくくなる不具合を回避でき、微振幅の振動をより十分吸収することができるようになる。 In addition, the tip end of the first rib and the tip end of the second rib may be arranged radially inward from the inner peripheral edge of the plurality of second openings, whereby the rigidity of the thin portion is high. It becomes easier to avoid becoming too much, and the problem that the elastic partition film hardly follows the change in the hydraulic pressure of the first liquid chamber can be avoided, and vibrations with a small amplitude can be absorbed more sufficiently.

本発明においては、また、前記第１リブの頂部のうち前記厚肉部から最も遠い頂部部分と、前記第２リブの頂部のうち前記厚肉部から最も遠い頂部部分とが、前記厚肉部の厚さ方向で前記厚肉部の外方側に突出していてもよい。この場合、第１リブの前記頂部部分や第２リブの前記頂部部分が変位規制部材に接触することになり、弾性仕切り膜と変位規制部材との接触面の面積を十分に小さくすることができる。前記接触面の面積を十分に小さくする手段として、例えば、弾性仕切り膜本体の膜面に複数の小突起を設け、弾性仕切り膜と変位規制部材とが接触する場合に、小突起を変位規制部材に接触させる手段では、前記接触によって小突起が圧縮されたときに弾性仕切り膜本体の膜面が変位規制部材に衝突して異音が大きくなるおそれがあるが、本発明では、前記小突起に対応する前記頂部部分が仮に圧縮されたとしても、そのときにはリブの本体部が変位規制部材に衝突するから、前記接触面の面積を十分に小さくすることができて、異音の発生を抑制することができる。また、第１リブの頂部や第２リブの頂部のうち厚肉部から最も遠い頂部部分を突出させたので、弾性仕切り膜と変位規制部材が接触する場合に、該頂部部分を変位規制部材に確実に接触させることができる。しかも、第１リブや第２リブを介して変位規制部材で厚肉部を安定支持できて、厚肉部の姿勢が崩れるのを防止することができる。 In the present invention, the top portion of the first rib farthest from the thick portion and the top portion of the second rib farthest from the thick portion are the thick portions. May protrude outward of the thick portion in the thickness direction. In this case, the top portion of the first rib and the top portion of the second rib come into contact with the displacement regulating member, and the area of the contact surface between the elastic partition film and the displacement regulating member can be sufficiently reduced. . As a means for sufficiently reducing the area of the contact surface, for example, when a plurality of small projections are provided on the membrane surface of the elastic partition membrane main body and the elastic partition membrane and the displacement regulating member are in contact with each other, the small projection is displaced by the displacement regulating member. When the small projection is compressed by the contact, the membrane surface of the elastic partition membrane main body may collide with the displacement regulating member and the noise may increase. Even if the corresponding top portion is compressed, the main body portion of the rib then collides with the displacement regulating member, so that the area of the contact surface can be made sufficiently small and the generation of abnormal noise is suppressed. be able to. In addition, since the top portion farthest from the thick portion of the top portion of the first rib and the second rib is protruded, when the elastic partition film and the displacement restricting member are in contact with each other, the top portion is used as the displacement restricting member. It can be reliably contacted. In addition, the thick portion can be stably supported by the displacement regulating member via the first rib and the second rib, and the posture of the thick portion can be prevented from collapsing.

本発明においては、前記第１リブと前記第２リブが前記一対の変位規制部材で挟持されていてもよく、これにより、弾性仕切り膜の姿勢を安定させることができる。 In the present invention, the first rib and the second rib may be sandwiched between the pair of displacement regulating members, whereby the posture of the elastic partition film can be stabilized.

また、前記第１リブと前記第２リブは、長手方向の横断面が前記頂部を頂点とする三角形状であってもよく、これにより、リブの倒れを防止しながら、変位規制部材との接触面積を極力小さくして異音抑制効果をより効果的に発揮させることができる。 In addition, the first rib and the second rib may have a triangular cross section in the longitudinal direction with the apex at the apex, thereby preventing the rib from collapsing and contacting the displacement regulating member. The area can be made as small as possible, and the effect of suppressing abnormal noise can be exhibited more effectively.

本発明においては、前記第１液室内に撹拌板が設けられ、前記撹拌板の外周縁と前記第１液室の内周面との間に第１液室側オリフィスが形成されていてもよい。上記のように、高周波数の振動が入力した場合、弾性仕切り膜の往復動変形により第１液室の液圧を吸収して高動ばね化を抑制するが、より高い周波数域の振動が入力すると、弾性仕切り膜の変位抵抗が増大して、低動ばね化が不十分になることが考えられる。この場合に、上記撹拌板を設けると、第１液室側オリフィスを流通する液体を高周波数域で共振させることができ（前記液体の共振周波数を高い値に設定する）、高周波数域での本装置の低動ばね化を図ることができる。 In the present invention, a stirring plate may be provided in the first liquid chamber, and a first liquid chamber side orifice may be formed between an outer peripheral edge of the stirring plate and an inner peripheral surface of the first liquid chamber. . As described above, when high frequency vibration is inputted, the fluid pressure in the first liquid chamber is absorbed by the reciprocating deformation of the elastic partition membrane to suppress the high dynamic spring, but vibration in a higher frequency range is inputted. Then, it is considered that the displacement resistance of the elastic partition film increases and the low dynamic spring becomes insufficient. In this case, when the stirring plate is provided, the liquid flowing through the first liquid chamber side orifice can be resonated in a high frequency range (the resonance frequency of the liquid is set to a high value). This device can reduce the dynamic spring.

本発明によれば、変位規制部材への弾性仕切り膜の衝突による異音を十分低減することができるとともに、高周波数域での動ばね定数を低減してこもり音等の高周波微振幅の振動を減衰することができ、更に、動荷重の増加を抑えてそれによる異音を低減することができる。 According to the present invention, abnormal noise due to the collision of the elastic partition film with the displacement regulating member can be sufficiently reduced, and the dynamic spring constant in the high frequency range can be reduced to reduce vibrations with high frequency and small amplitude such as booming noise. Further, it is possible to attenuate the noise, and further, it is possible to suppress an increase in the dynamic load and reduce an abnormal noise caused thereby.

以下、本発明の実施の形態を図面に基づいて説明する。図１，図２にＦＲ車用の液封入式防振装置を示してある。この液封入式防振装置は、トランスミッションに対し第１取付けブラケット１１４を介して取り付けられる第１取付け具１と、車体側のメンバーに対し第２取付けブラケット１１０を介して取り付けられる筒状の第２取付け具２と、これらを連結する円錐台状のゴム状弾性体からなる防振基体３とを備えている。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 and 2 show a liquid-filled vibration isolator for an FR vehicle. The liquid-filled vibration isolator includes a first attachment 1 that is attached to a transmission via a first attachment bracket 114, and a cylindrical second attachment that is attached to a vehicle body side member via a second attachment bracket 110. A fixture 2 and a vibration isolating base 3 made of a truncated cone-like rubber-like elastic body for connecting them are provided.

第１取付け具１は段付き円柱形状で、その下端部が、断面コの字状の第１取付けブラケット１１４にボルト締結されている。第１取付けブラケット１１４はゴム部材１１５で覆われている。図２の符号６は複数の取付けボルトを示している。第２取付け具２は、防振基体３が加硫成形される下側の筒状金具４と、この下側の筒状金具４に対して同心状の上側の筒状金具５とからなり、下側の筒状金具４は筒状の収容金具１０７に内嵌し収容されている。防振基体３は、第１取付け具１の外周面と下側の筒状金具４の内周面とにそれぞれ加硫接着されている。 The first fixture 1 has a stepped columnar shape, and a lower end portion thereof is bolted to a first mounting bracket 114 having a U-shaped cross section. The first mounting bracket 114 is covered with a rubber member 115. Reference numeral 6 in FIG. 2 indicates a plurality of mounting bolts. The second fixture 2 includes a lower cylindrical metal fitting 4 on which the vibration-isolating base 3 is vulcanized and an upper cylindrical metal fitting 5 concentric with the lower cylindrical metal fitting 4. The lower cylindrical metal fitting 4 is housed and accommodated in a cylindrical accommodation metal fitting 107. The anti-vibration base 3 is vulcanized and bonded to the outer peripheral surface of the first fixture 1 and the inner peripheral surface of the lower cylindrical metal fitting 4.

そして、上側の筒状金具５の上端部に、防振基体３との間に液体封入室８を形成するゴム膜からなるダイヤフラム９が加硫成形されて、液体封入室８に液体が封入されている。また、液体封入室８を防振基体３側の第１液室１１Ａとダイヤフラム９側の第２液室１１Ｂに仕切る仕切り体１２が、上側の筒状金具５の上端部の折曲部５Ｂと段付き円筒状の挟持部材１３２とで挟持固定されている。挟持部材１３２の下端部にはフランジ１３２Ｃが設けられており、このフランジ１３２Ｃを下側の筒状金具４のフランジ４Ａと上側の筒状金具５のフランジ５Ａとが挟み込んだ状態になるように、これら３枚のフランジ４Ａ，５Ａ，１３２Ｃが一体にかしめ固定されている。 A diaphragm 9 made of a rubber film that forms a liquid enclosure chamber 8 is formed between the upper end of the upper cylindrical metal fitting 5 and the antivibration base 3 so that the liquid enclosure chamber 8 is filled with liquid. ing. In addition, the partition body 12 that divides the liquid enclosure chamber 8 into a first liquid chamber 11A on the vibration isolating base 3 side and a second liquid chamber 11B on the diaphragm 9 side includes a bent portion 5B on the upper end portion of the upper cylindrical metal fitting 5 and It is clamped and fixed by a stepped cylindrical clamping member 132. A flange 132C is provided at the lower end portion of the clamping member 132, and the flange 132C is sandwiched between the flange 4A of the lower cylindrical metal fitting 4 and the flange 5A of the upper cylindrical metal fitting 5 so as to be sandwiched. These three flanges 4A, 5A, and 132C are caulked and fixed together.

図４にも示されるように、仕切り体１２は、ゴム膜からなる円板状の弾性仕切り膜１５と、この弾性仕切り膜１５を収容して、内周面間に一体に設けた第１変位規制部材１７で受け止める筒部材１６と、この筒部材１６の一端部側の開口を覆う第２変位規制部材１８とからなる。つまり、第１変位規制部材１７と第２変位規制部材１８が、弾性仕切り膜１５の変位量を、その弾性仕切り膜１５の膜面の両側から規制している。第１変位規制部材１７と第２変位規制部材１８に、弾性仕切り膜１５の軸心方向視で互いに重複する開口部５４，８４がそれぞれ形成されている。 As shown also in FIG. 4, the partition 12 includes a disc-shaped elastic partition film 15 made of a rubber film, and a first displacement integrally provided between the inner peripheral surfaces that accommodates the elastic partition film 15. The cylinder member 16 received by the regulating member 17 and the second displacement regulating member 18 covering the opening on the one end side of the cylinder member 16 are included. That is, the first displacement regulating member 17 and the second displacement regulating member 18 regulate the displacement amount of the elastic partition film 15 from both sides of the film surface of the elastic partition film 15. The first displacement restricting member 17 and the second displacement restricting member 18 are formed with openings 54 and 84 that overlap each other when viewed in the axial direction of the elastic partition film 15.

第１液室１１Ａと第２液室１１Ｂはシェイクオリフィスとしてのオリフィス２５を介して連通されており、このオリフィス２５は、筒部材１６の外周面と上側の筒状金具５の内周面との間、詳しくは上側の筒状金具５の内周面に加硫成形したゴム膜７との間に形成されている。図７に示すように、筒部材１６は外周部にオリフィス形成溝８３を備えている。オリフィス２５は、筒部材１６の上側切欠き５８（図６参照）を介して第２液室１１Ｂと連通し、挟持部材１３２に形成された開口５９（図５参照）を介して第１液室１１Ａと連通している。 The first liquid chamber 11A and the second liquid chamber 11B communicate with each other via an orifice 25 serving as a shake orifice. The orifice 25 is formed between the outer peripheral surface of the cylindrical member 16 and the inner peripheral surface of the upper cylindrical metal fitting 5. Specifically, it is formed between the rubber film 7 vulcanized and formed on the inner peripheral surface of the upper cylindrical metal fitting 5. As shown in FIG. 7, the cylindrical member 16 includes an orifice forming groove 83 on the outer peripheral portion. The orifice 25 communicates with the second liquid chamber 11B through the upper notch 58 (see FIG. 6) of the cylindrical member 16, and the first liquid chamber through the opening 59 (see FIG. 5) formed in the clamping member 132. It communicates with 11A.

図８，９に示すように第２変位規制部材１８は円板状に形成され、筒部材１６の上端部側の開口部に形成された取付け座８０に圧入内嵌している。第２変位規制部材１８の開口部８４は、径方向中央に形成された円形の第１開口８４Ａと、この第１開口８４Ａの周りに分散して形成された４個の円弧状の第２開口８４Ｂとからなる。４個の第２開口８４Ｂは互いに同一の大きさ及び形状で、第１開口８４Ａの軸心周りに点対称に位置している。 As shown in FIGS. 8 and 9, the second displacement regulating member 18 is formed in a disc shape, and is press-fitted into a mounting seat 80 formed in the opening on the upper end side of the cylindrical member 16. The opening 84 of the second displacement regulating member 18 includes a circular first opening 84A formed at the center in the radial direction, and four arc-shaped second openings formed around the first opening 84A. 84B. The four second openings 84B have the same size and shape as each other, and are positioned point-symmetrically around the axis of the first opening 84A.

図６に示すように、第１変位規制部材１７の開口部５４は、径方向中央に形成された円形の第１開口５４Ａと、この第１開口５４Ａの周りに分散して形成された４個の円弧状の第２開口５４Ｂとからなる。４個の第２開口５４Ｂは互いに同一の大きさ及び形状で、第１開口５４Ａの軸心周りに点対称に位置している。 As shown in FIG. 6, the opening 54 of the first displacement regulating member 17 has a circular first opening 54A formed at the center in the radial direction, and four pieces formed dispersedly around the first opening 54A. Arc-shaped second opening 54B. The four second openings 54B have the same size and shape as each other, and are positioned point-symmetrically around the axis of the first opening 54A.

第１変位規制部材１７の第１開口５４Ａと、第２変位規制部材１８の第１開口８４Ａとは、同一の大きさ及び形状であり、第１変位規制部材１７の第２開口５４Ｂと、第２変位規制部材１８の第２開口８４Ｂとは、同一の大きさ及び形状である。そして、それらの軸心方向視で、第１変位規制部材１７の第１開口５４Ａと、第２変位規制部材１８の第１開口８４Ａとが、同一位置に位置して重複し、第１変位規制部材１７の各第２開口５４Ｂと、第２変位規制部材１８の各第２開口８４Ｂとが、同一位置に位置して重複している。 The first opening 54A of the first displacement restriction member 17 and the first opening 84A of the second displacement restriction member 18 have the same size and shape, and the second opening 54B of the first displacement restriction member 17 and the first opening The second opening 84B of the two displacement restricting member 18 has the same size and shape. Then, when viewed in the axial direction, the first opening 54A of the first displacement regulating member 17 and the first opening 84A of the second displacement regulating member 18 are located at the same position and overlap with each other. Each 2nd opening 54B of member 17 and each 2nd opening 84B of the 2nd displacement control member 18 are located in the same position, and overlap.

図１０〜１３に示すように、弾性仕切り膜１５は、その軸心方向視で第１開口５４Ａ，８４Ａ内に位置する径方向中央側の円板状の厚肉部５０と、この厚肉部５０の径方向外方側に位置し、厚肉部５０の厚さ方向（弾性仕切り膜１５の軸心方向）で厚肉部５０の中間部に位置するとともに一対の変位規制部材１７，１８から離間して位置する薄肉部５１と、変位規制部材１７，１８に対する外周側の固定部５２と、薄肉部５１の一方の膜面９１に設けられて頂部８１が第１変位規制部材１７に当接する８個の第１リブ５３Ａと、薄肉部５１の他方の膜面９３に設けられて頂部１０１が第２変位規制部材１８に当接する８個の第２リブ５３Ｂとからなる。 As shown in FIGS. 10 to 13, the elastic partition film 15 includes a disk-shaped thick portion 50 located in the first opening 54 A and 84 A in the axial direction as viewed in the axial direction, and the thick portion. 50 located radially outward, located in the middle of the thick portion 50 in the thickness direction of the thick portion 50 (in the axial direction of the elastic partition film 15) and from the pair of displacement regulating members 17 and 18 The thin portion 51 that is spaced apart, the fixing portion 52 on the outer peripheral side with respect to the displacement restricting members 17 and 18, and the top portion 81 that is provided on one film surface 91 of the thin portion 51 abuts on the first displacement restricting member 17. The eight first ribs 53 A and eight second ribs 53 B that are provided on the other film surface 93 of the thin portion 51 and the top portion 101 abuts against the second displacement regulating member 18.

複数の第１リブ５３Ａと第２リブ５３Ｂは、厚肉部５０に隣接する薄肉部５１の内周側の縁部において厚肉部５０の外周面９２から放射状に延設されている。詳細には、第１リブ５３Ａは、厚肉部５０と薄肉部５１との境界部において、厚肉部５０の周りに放射状に位置するように、薄肉部５１の一方の膜面９１と厚肉部５０の下側の外周面９２に一体に設けられている。また、第２リブ５３Ｂは、厚肉部５０と薄肉部５１との境界部において、厚肉部５０の周りに放射状に位置するように、薄肉部５１の他方の膜面９３と厚肉部５０の上側の外周面９２に一体に設けられている。そして、弾性仕切り膜１５の径方向で、第１リブ５３Ａ及び第２リブ５３Ｂの先端９４よりも外方側の薄肉部部分９５が一対の変位規制部材１７，１８の第２開口５４Ｂ，８４Ｂに臨むように構成してある（図３参照）。 The plurality of first ribs 53 A and second ribs 53 B extend radially from the outer peripheral surface 92 of the thick portion 50 at the inner peripheral edge of the thin portion 51 adjacent to the thick portion 50. Specifically, the first rib 53 A is formed on the boundary between the thick portion 50 and the thin portion 51, so that the first rib 53 A is positioned radially around the thick portion 50 and the one film surface 91 of the thin portion 51. It is integrally provided on the outer peripheral surface 92 on the lower side of the portion 50. Further, the second rib 53 B is positioned radially around the thick portion 50 at the boundary between the thick portion 50 and the thin portion 51, and the other film surface 93 of the thin portion 51 and the thick portion 50. Are integrally provided on the outer peripheral surface 92 on the upper side. Then, in the radial direction of the elastic partition film 15, the thin-walled portion 95 on the outer side from the tips 94 of the first rib 53A and the second rib 53B is formed in the second openings 54B and 84B of the pair of displacement regulating members 17 and 18. It is comprised so that it may face (refer FIG. 3).

また、複数の第１リブ５３Ａと第２リブ５３Ｂは、それぞれ厚肉部５０の軸心Ｏに対して放射状に、かつ、均等な角度４５°ごとに配置され、弾性仕切り膜１５の軸心方向視で各第１リブ５３Ａと各第２リブ５３Ｂが重なっている。また、上記のようにそれぞれ４個ずつの第２開口５４Ｂ，８４Ｂは、厚肉部５０の周方向に均等な角度ごとに配置されており、第２開口５４Ｂ，８４Ｂは厚肉部５０の周方向に沿う円弧状である（図６，８参照）。 The plurality of first ribs 53 A and second ribs 53 B are arranged radially with respect to the axis O of the thick portion 50 and at an equal angle of 45 °, and the axial direction of the elastic partition film 15. The first ribs 53A and the second ribs 53B overlap each other as viewed. Further, as described above, the four second openings 54B and 84B are arranged at equal angles in the circumferential direction of the thick part 50, and the second openings 54B and 84B are arranged around the thick part 50. It has an arc shape along the direction (see FIGS. 6 and 8).

第１リブ５３Ａ及び第２リブ５３Ｂは、その長手方向を横断する断面の形状が頂部８１，１０１を頂点とする三角形状をなしている（図１４参照）。第１リブ５３Ａ及び第２リブ５３Ｂの先端９４は、薄肉部５１の膜面側ほど径方向外方側に位置するように傾斜して設けられている（図１２参照）。また、第１リブ５３Ａ及び第２リブ５３Ｂの先端９４は、複数の第２開口５４Ｂ，８４Ｂの内周縁１０２，１０６よりも径方向内方側に位置している（図３参照）。 The first rib 53A and the second rib 53B have a triangular shape with the apexes 81 and 101 as vertices in the cross-sectional shape crossing the longitudinal direction (see FIG. 14). The distal ends 94 of the first ribs 53A and the second ribs 53B are inclined so as to be positioned on the radially outer side as the film surface side of the thin portion 51 (see FIG. 12). Further, the tips 94 of the first rib 53A and the second rib 53B are located radially inward from the inner peripheral edges 102 and 106 of the plurality of second openings 54B and 84B (see FIG. 3).

また、図１２に示すように、第１リブ５３Ａの頂部８１のうち厚肉部５０から最も遠い頂部部分８１Ａと、第２リブ５３Ｂの頂部１０１のうち厚肉部５０から最も遠い頂部部分１０１Ａとが、厚肉部５０の厚さ方向で厚肉部５０の外方側に少し突出している。そして、かかる第１リブ５３Ａと第２リブ５３Ｂが、第１変位規制部材１７と第２変位規制部材１８とに挟持されている。 Further, as shown in FIG. 12, the top portion 81A farthest from the thick portion 50 among the top portions 81 of the first rib 53A, and the top portion 101A farthest from the thick portion 50 among the top portions 101 of the second rib 53B, However, it protrudes slightly to the outer side of the thick part 50 in the thickness direction of the thick part 50. The first rib 53A and the second rib 53B are sandwiched between the first displacement regulating member 17 and the second displacement regulating member 18.

弾性仕切り膜１５の固定部５２は、薄肉部５１から弾性仕切り膜１５の厚さ方向両側に突出している。そして、その突出端部に断面円弧状の凸部８６が形成されている。両凸部８６の頂面間の長さは厚肉部５０の厚さよりも長く設定されている。この固定部５２は、一対の変位規制部材１７，１８で挟持固定されている。 The fixing part 52 of the elastic partition film 15 protrudes from the thin part 51 to both sides in the thickness direction of the elastic partition film 15. A protruding portion 86 having a circular arc cross section is formed at the protruding end. The length between the top surfaces of both convex portions 86 is set longer than the thickness of the thick portion 50. The fixing portion 52 is clamped and fixed by a pair of displacement regulating members 17 and 18.

図３，５に示すように、弾性仕切り膜１５の薄肉部５１の内周側縁部は、上記した複数の第１リブ５３Ａ及び第２リブ５３Ｂによって、表裏それぞれ、周方向に複数に区画されている。そして、図４にも示されるように、このようにして区画された各薄肉部部分１２０が、弾性仕切り膜１５の軸心方向において第１開口５４Ａ，８４Ａに臨むように構成されている。すなわち、第１開口５４Ａ，８４Ａは、その開口縁９７，１０５と厚肉部５０の外周面９２との間で径方向に所定の隙間が確保されるように、厚肉部５０よりも大径に形成されているので、上記軸心方向視において薄肉部５１はその内周端部分が第１開口５４Ａ，８４Ａ内まで延在しており、つまり、厚肉部５０の周りには上記薄肉部部分１２０から軸心方向に開口する液体の流路が確保されている。また、上記のように放射状に延びる第１リブ５３Ａ及び第２リブ５３Ｂを設けたのみであるため、第１開口５４Ａ，８４Ａと第２開口５４Ｂ，８４Ｂとの間の変位規制部材部分１２２と、これに対向する薄肉部部分１２４との間には液体が流れる流路１２６が確保されている。そのため、図５に示すように、第１開口５４Ａから上記各薄肉部部分１２０に進入してきた液体が、この流路１２６を通って第２開口５４Ｂ側に流れるように構成されている。図５において、Ｌ１はシェイクオリフィスの液流れを示し、Ｌ２は薄肉部５１を往復動変形させるための高周波オリフィスの液流れを示している。 As shown in FIGS. 3 and 5, the inner peripheral side edge of the thin portion 51 of the elastic partition membrane 15 is divided into a plurality in the circumferential direction by the plurality of first ribs 53A and the second ribs 53B. ing. As shown in FIG. 4, the thin-walled portions 120 partitioned in this way are configured to face the first openings 54 A and 84 A in the axial direction of the elastic partition film 15. That is, the first openings 54A and 84A have a diameter larger than that of the thick portion 50 so that a predetermined gap is secured in the radial direction between the opening edges 97 and 105 and the outer peripheral surface 92 of the thick portion 50. Therefore, the thin portion 51 has an inner peripheral end portion extending into the first openings 54A and 84A in the axial direction view, that is, around the thick portion 50, the thin portion A liquid passage opening from the portion 120 in the axial direction is secured. Further, since only the first rib 53A and the second rib 53B extending radially as described above are provided, the displacement regulating member portion 122 between the first openings 54A and 84A and the second openings 54B and 84B, A flow path 126 through which the liquid flows is secured between the thin-walled portion 124 facing this. Therefore, as shown in FIG. 5, the liquid that has entered the thin-walled portion 120 from the first opening 54A flows through the flow path 126 toward the second opening 54B. In FIG. 5, L1 indicates the liquid flow of the shake orifice, and L2 indicates the liquid flow of the high-frequency orifice for reciprocatingly deforming the thin portion 51.

図４に示すように、第１液室１１Ａ内には、円板状の撹拌板６０が設けられており、撹拌板６０の外周縁６１と第１液室１１Ａの内周面６２との間に、第１液室側オリフィス６３が形成されている。撹拌板６０は、防振基体３を貫通した第１取付け具１の上端部６５に、撹拌板６０の中央部における上方に膨出した連結部６６を外嵌させることにより固定されている。 As shown in FIG. 4, a disc-shaped stirring plate 60 is provided in the first liquid chamber 11A, and between the outer peripheral edge 61 of the stirring plate 60 and the inner peripheral surface 62 of the first liquid chamber 11A. In addition, a first liquid chamber side orifice 63 is formed. The stirring plate 60 is fixed by externally fitting a connecting portion 66 bulging upward in the central portion of the stirring plate 60 to the upper end portion 65 of the first fixture 1 penetrating the vibration isolation base 3.

以上よりなる本実施形態の液封入式防振装置であると、弾性仕切り膜１５は、表裏それぞれにおいて、８個の第１リブ５３Ａ及び第２リブ５３Ｂのみで変位規制部材１７，１８に対して変位規制のための当接支持が行われており、厚肉部５０は変位規制部材１７，１８により直接当接支持されない。そのため、薄肉部５１と厚肉部５０が変位規制されながらも動きやすく、従って、高周波数域での動ばね定数の低減効果に優れる。 In the liquid-filled vibration isolator of the present embodiment configured as described above, the elastic partition film 15 has only eight first ribs 53 A and second ribs 53 B on the front and back surfaces with respect to the displacement regulating members 17 and 18. Contact support for displacement restriction is performed, and the thick portion 50 is not directly contacted and supported by the displacement restriction members 17 and 18. Therefore, the thin-walled portion 51 and the thick-walled portion 50 are easy to move while being restricted in displacement, and thus are excellent in the effect of reducing the dynamic spring constant in the high frequency range.

また、図５に示すように、第１開口５４Ａから進入してきた液体は、厚肉部５０に作用するだけでなく、厚肉部５０の周りから上記薄肉部部分１２０に至り、更に上記流路１２６を通って第２開口５４Ｂ側に流れて、薄肉部５０の全体に作用する。そのため、第２開口５４Ｂだけでなく、第１開口５４Ａの一部も、薄肉部５１を往復動変形させるためのオリフィスとして機能させることができる。つまり、薄肉部５１のための高周波オリフィスは、４つの第２開口５４Ｂの開口面積と、厚肉部５０の周りで上記８個の第１リブ５３Ａによって区画された８つの隙間の開口面積との総面積を、オリフィス断面積として構成されているので、上記８つの隙間の分だけ従来にも増して大きな断面積を確保することができる。ここで、かかるオリフィスの機能をより効果的に発揮させるため、上記隙間ｗが上記流路１２６の高さｈに対して同等以上に設定されていることが好ましい（図４参照）。 Further, as shown in FIG. 5, the liquid that has entered from the first opening 54 A not only acts on the thick part 50, but also reaches the thin part 120 from around the thick part 50, and further the flow path 126 flows to the second opening 54B side and acts on the entire thin portion 50. Therefore, not only the second opening 54B but also a part of the first opening 54A can function as an orifice for reciprocatingly deforming the thin portion 51. That is, the high-frequency orifice for the thin portion 51 has an opening area of the four second openings 54B and an opening area of the eight gaps partitioned by the eight first ribs 53A around the thick portion 50. Since the total area is configured as an orifice cross-sectional area, a larger cross-sectional area than the conventional one can be secured by the above-described eight gaps. Here, in order to exhibit the function of the orifice more effectively, the gap w is preferably set equal to or higher than the height h of the flow path 126 (see FIG. 4).

また、弾性仕切り膜１５が、厚肉部５０から延設された放射状の第１リブ５３Ａ及び第２リブ５３Ｂのみで変位規制されており、第１開口５４Ａ，８４Ａや第２開口５４Ｂ，８４Ｂをその全周にわたって取り囲むようなリブが設けられていないので、弾性仕切り膜１５の全体が動くことができ、そのため、動荷重の増加を抑えることができる。 The elastic partition film 15 is restricted in displacement only by the radial first ribs 53A and second ribs 53B extending from the thick portion 50, and the first openings 54A and 84A and the second openings 54B and 84B are restricted. Since no ribs are provided so as to surround the entire circumference, the entire elastic partition film 15 can move, and therefore an increase in dynamic load can be suppressed.

また、このような８個の第１リブ５３Ａと第２リブ５３Ｂの頂部８１，１０１が変位規制部材１７，１８に当接するだけであるため、弾性仕切り膜１５と変位規制部材１７，１８との接触面積を十分に小さくすることができ、そのため、変位規制部材１７，１８への衝突による異音を十分低減することができる。 In addition, since the top portions 81 and 101 of the eight first ribs 53A and the second ribs 53B just abut against the displacement restricting members 17 and 18, the elastic partition film 15 and the displacement restricting members 17 and 18 The contact area can be made sufficiently small, so that the noise caused by the collision with the displacement regulating members 17 and 18 can be sufficiently reduced.

ここで、上記実施形態の動ばね特性と動荷重特性を評価した試験結果について説明する。評価は、動ばね試験機として鷺ノ宮製の「Dynamic Servo」を用い、これにハイパスフィルター（エヌエフ回路ブロック製「３６２４」）と、ファーストフーリエトランスミッタ（小野測器製「ＣＦ−６４００」）を図１５に示すように接続して行った。動荷重特性では、動ばね試験機設定として、加振周波数：１２Ｈｚ、加振変位：±１．５ｍｍ、初期荷重：１３００Ｎとし、フィルタ設定として、遮断周波数：１００Ｈｚ以下、次数：２４ｄＢ／ＯＣＴとし、ファーストフーリエトランスミッタ設定として、サンプリング周波数：８００Ｈｚ、サンプリング数：１０２４、ウィンドウ関数：Hanning、アベレージング：POWER SUM 10回、トリガー：ＯＮとした。また、動ばね特性では、初期荷重：１３００Ｎ、加振変位：±０．０５ｍｍとして、周波数をスイープさせて行った。また、評価対象は次の４例の仕切り体構造を持つ防振装置とした。 Here, the test result which evaluated the dynamic spring characteristic and dynamic load characteristic of the said embodiment is demonstrated. The evaluation uses “Dynamic Servo” manufactured by Ashinomiya as a dynamic spring testing machine, and a high pass filter (“3624” manufactured by NF circuit block) and a first Fourier transmitter (“CF-6400” manufactured by Ono Sokki) are used in FIG. Connected as shown. In the dynamic load characteristics, as a dynamic spring tester setting, an excitation frequency: 12 Hz, an excitation displacement: ± 1.5 mm, an initial load: 1300 N, a filter setting, a cutoff frequency: 100 Hz or less, an order: 24 dB / OCT, As the first Fourier transmitter setting, sampling frequency: 800 Hz, sampling number: 1024, window function: Hanning, averaging: POWER SUM 10 times, trigger: ON. In the dynamic spring characteristics, the initial load was 1300 N and the excitation displacement was ± 0.05 mm, and the frequency was swept. Moreover, the evaluation object was the vibration isolator having the partition structure of the following four examples.

実施例：図１６（Ａ）に示す上記した本実施形態の仕切り体構造
比較例１：図１６（Ｂ）に示すように、本実施形態の仕切り体構造において、厚肉部５０の外周縁部に全周に延びる突条２００を設けて、厚肉部５０の外周縁が変位規制部材１７，１８により全周にわたって挟持された構造（上記特許文献３に類似の構造）
比較例２：図１６（Ｃ）に示すように、比較例１の構造において、全周に延びる突条２００に換えて、８個の小突起２０２を周方向に均等に配置した構造（上記特許文献３に類似の構造に上記特許文献４を適用した構造）
比較例３：上記特許文献２に相当する仕切り体構造（格子状の変位規制部材の各貫通孔が全周にわたって取り囲まれるように、弾性仕切り膜の表面に蜘蛛の巣状のリブを設けた構造）。 Example: Comparative Example of Partition Structure of the Present Embodiment As Shown in FIG. 16 (A) 1: As shown in FIG. 16 (B), in the partition structure of the present embodiment, the outer peripheral edge of the thick portion 50 A protrusion 200 extending around the entire circumference is provided, and the outer peripheral edge of the thick portion 50 is sandwiched by the displacement regulating members 17 and 18 over the entire circumference (a structure similar to Patent Document 3 above)
Comparative Example 2: As shown in FIG. 16 (C), in the structure of Comparative Example 1, a structure in which eight small protrusions 202 are evenly arranged in the circumferential direction instead of the ridges 200 extending all around (the above-mentioned patent). (Structure obtained by applying Patent Document 4 to a structure similar to Document 3)
Comparative Example 3: Partition structure equivalent to the above-mentioned Patent Document 2 (a structure in which spider web-like ribs are provided on the surface of the elastic partition film so that each through hole of the lattice-like displacement regulating member is surrounded over the entire circumference. ).

動ばね特性の評価結果は図１７に示す通りである。比較例１では、厚肉部５０の全周縁が変位規制部材１７，１８により挟持されているため、厚肉部５０が動きにくく、また、変位規制部材１７，１８の中央開口部５４Ａ，８４Ａに隙間がないことから薄肉部５１のためのオリフィスの開口面積が小さい。そのため、高周波数域での動ばね定数が許容レベルを超えるものであり、こもり音が発生するものであった。また、比較例２では、変位規制部材１７，１８の中央開口部５４Ａ，８４Ａからその周囲の薄肉部５１への液体の流れが期待されたものの、図１６（Ｃ）に示すように、この部分のオリフィスは軸心方向視で開口しておらず、また、厚肉部５０とその上方の変位規制部材１７との間での隙間が小さいため、有効なオリフィス断面積を得ることができず、そのため、高周波数域での動ばね定数が許容レベルを超えるものであった。これに対し、実施例の防振装置では、厚肉部５０の周りの空間が軸心方向に開口しており、この部分を高周波オリフィスとして有効に作用させることができるため、薄肉部５１を変位させるためのオリフィスの開口面積が大きくなり、また厚肉部５０も動きやすいため、十分な低動ばね化が図られていた。 The evaluation results of the dynamic spring characteristics are as shown in FIG. In Comparative Example 1, since the entire periphery of the thick portion 50 is sandwiched between the displacement restricting members 17 and 18, the thick portion 50 is difficult to move, and the central openings 54A and 84A of the displacement restricting members 17 and 18 Since there is no gap, the opening area of the orifice for the thin portion 51 is small. Therefore, the dynamic spring constant in the high frequency range exceeds the allowable level, and a muffled noise is generated. Further, in Comparative Example 2, the liquid flow from the central openings 54A and 84A of the displacement regulating members 17 and 18 to the surrounding thin portion 51 was expected. However, as shown in FIG. The orifice is not opened in the axial direction view, and since the gap between the thick wall portion 50 and the displacement regulating member 17 thereabove is small, an effective orifice cross-sectional area cannot be obtained, Therefore, the dynamic spring constant in the high frequency range exceeded the allowable level. On the other hand, in the vibration isolator of the embodiment, the space around the thick portion 50 is opened in the axial direction, and this portion can be effectively acted as a high frequency orifice, so that the thin portion 51 is displaced. Since the opening area of the orifice to be increased is large, and the thick portion 50 is also easy to move, a sufficiently low dynamic spring has been achieved.

動荷重特性の評価結果は図１８に示す通りである。比較例３では、リブが各貫通孔の全周で当接し、変位規制部材に対する弾性仕切り膜の接触面積が大きいため、特に３００Ｈｚ以上の高周波数域での動荷重の増加が大きく、異音が発生しやすいものであった。また、比較例２でも動荷重が許容レベルを超えていた。これに対し、実施例の防振装置では、弾性仕切り膜の全体が動きやすいため、動荷重が許容レベルを超えることがなく、異音の発生しにくいものであった。 The evaluation results of the dynamic load characteristics are as shown in FIG. In Comparative Example 3, the ribs abut on the entire circumference of each through-hole, and the contact area of the elastic partition film with the displacement regulating member is large. Therefore, the increase in dynamic load particularly in a high frequency range of 300 Hz or more is large, and abnormal noise is generated. It was easy to occur. In Comparative Example 2, the dynamic load exceeded the allowable level. On the other hand, in the vibration isolator of the example, the entire elastic partition film is easy to move, so that the dynamic load does not exceed the allowable level and noise is hardly generated.

このように本実施形態の構造であると、高周波数域での低動ばね化と、動荷重の低減とを両立することができ、こもり音の抑制効果と、液室内の脈動などに起因する異音の抑制効果に優れていた。 Thus, with the structure of the present embodiment, it is possible to achieve both a low dynamic spring in a high frequency range and a reduction in dynamic load, resulting from the effect of suppressing the booming noise and the pulsation in the liquid chamber. Excellent noise suppression effect.

なお、上記実施形態では、第１リブ５３Ａ及び第２リブ５３Ｂを一対の変位規制部材１７，１８に当接される構成としたが、本発明においては、第１リブ５３Ａの頂部８１を第１変位規制部材１７から離間させておき、振動の入力に伴って第１変位規制部材１７に当接させるように構成してもよい。同様に、第２リブ５３Ｂの頂部１０１を第２変位規制部材１８から離間させておき、振動の入力に伴って第２変位規制部材１８に当接させるように構成してもよい。すなわち、第１リブ５３Ａの頂部８１は第１変位規制部材１７に当接可能であればよく、第２リブ５３Ｂの頂部１０１は第２変位規制部材１８に当接可能であればよい。 In the above embodiment, the first rib 53A and the second rib 53B are configured to be in contact with the pair of displacement regulating members 17 and 18, but in the present invention, the top 81 of the first rib 53A is the first. It may be configured to be separated from the displacement restricting member 17 and to be brought into contact with the first displacement restricting member 17 with the input of vibration. Similarly, the top portion 101 of the second rib 53B may be separated from the second displacement regulating member 18 so as to come into contact with the second displacement regulating member 18 in accordance with vibration input. That is, the top portion 81 of the first rib 53A only needs to be able to contact the first displacement regulating member 17, and the top portion 101 of the second rib 53B only needs to be able to contact the second displacement regulating member 18.

また、上記実施形態では、一対の変位規制部材のうち一方の変位規制部材１７を、外周部にオリフィス形成溝８３を備えた筒部材１６の内周面間に筒部材１６と一体に設け、他方の変位規制部材１８を、筒部材１６の一端部側の開口部に形成された取付け座８０に内嵌し、一対の変位規制部材１７，１８で弾性仕切り膜１５の固定部５２を挟持固定する構成としている。本発明では、この構造に換えて、一対の変位規制部材のうち一方の変位規制部材１７を、外周部にオリフィス形成溝８３を備えた筒部材１６の内周面間に筒部材１６と一体に設け、他方の変位規制部材１８の外周部側に連設した筒部（不図示）を筒部材１６の一端部に外嵌し、一対の変位規制部材１７，１８で弾性仕切り膜１５の固定部５２を挟持固定する構成を採用することもできる。これらの構成であると、部品点数の少なくすることができて、構造を簡素化することができる。 Further, in the above embodiment, one displacement regulating member 17 of the pair of displacement regulating members is provided integrally with the cylindrical member 16 between the inner peripheral surfaces of the cylindrical member 16 provided with the orifice forming groove 83 on the outer peripheral portion, and the other The displacement regulating member 18 is fitted into a mounting seat 80 formed in the opening on the one end side of the cylindrical member 16, and the fixing portion 52 of the elastic partition film 15 is sandwiched and fixed by the pair of displacement regulating members 17 and 18. It is configured. In the present invention, instead of this structure, one displacement regulating member 17 of the pair of displacement regulating members is integrated with the tubular member 16 between the inner circumferential surfaces of the tubular member 16 having the orifice forming groove 83 on the outer circumferential portion. A cylindrical portion (not shown) provided on the outer peripheral side of the other displacement regulating member 18 is fitted around one end of the cylindrical member 16, and the elastic partition membrane 15 is fixed by the pair of displacement regulating members 17, 18. It is also possible to adopt a configuration in which 52 is clamped and fixed. With these configurations, the number of parts can be reduced, and the structure can be simplified.

また、本発明は、第１液室１１Ａ内に撹拌板６０を設けない構造にも適用することができる。また、自動車のエンジンと車体フレームとの間に設けられる液封入式防振装置にも適用することができる。 The present invention can also be applied to a structure in which the stirring plate 60 is not provided in the first liquid chamber 11A. Further, the present invention can also be applied to a liquid-filled vibration isolator provided between an automobile engine and a body frame.

本発明の一実施形態に係る液封入式防振装置の縦断面図である。It is a longitudinal cross-sectional view of the liquid filled type vibration isolator which concerns on one Embodiment of this invention. 同防振装置の正面図である。It is a front view of the vibration isolator. 同防振装置の仕切り体の平面図である。It is a top view of the partition body of the vibration isolator. 同防振装置の一部拡大縦断面図（図３のIV−IV線に相当する断面）である。It is a partially expanded longitudinal cross-sectional view (cross section equivalent to the IV-IV line of FIG. 3) of the vibration isolator. 上記仕切り体の一部切欠斜視断面図である。It is a partially cutaway perspective sectional view of the partition body. 同防振装置の筒部材の平面図である。It is a top view of the cylinder member of the vibration isolator. 同筒部材の縦断面図である。It is a longitudinal cross-sectional view of the cylinder member. 同防振装置の第２変位規制部材の平面図である。It is a top view of the 2nd displacement control member of the vibration isolator. 同第２変位規制部材の縦断面図である。It is a longitudinal cross-sectional view of the said 2nd displacement control member. 同防振装置の弾性仕切り膜の平面図である。It is a top view of the elastic partition film of the vibration isolator. 図１０のXI−XI線断面図である。It is the XI-XI sectional view taken on the line of FIG. 図１１のXII部拡大図である。It is the XII section enlarged view of FIG. 図１０のXIII部拡大図である。It is the XIII section enlarged view of FIG. 図１３のXIV−XIV線断面図である。It is the XIV-XIV sectional view taken on the line of FIG. 動荷重特性及び動ばね特性の評価のための試験機の模式図である。It is a schematic diagram of the testing machine for evaluation of dynamic load characteristics and dynamic spring characteristics. 該評価の対象に係る仕切り体構造の模式図であり、（Ａ）実施例、（Ｂ）比較例１、（Ｃ）比較例２をそれぞれ示す。It is a schematic diagram of the partition body structure which concerns on this evaluation object, (A) Example, (B) Comparative example 1, (C) Comparative example 2 is shown, respectively. 動ばね特性の結果を示すグラフである。It is a graph which shows the result of a dynamic spring characteristic. 動荷重特性の結果を示すグラフである。It is a graph which shows the result of a dynamic load characteristic.

符号の説明Explanation of symbols

１…第１取付け具、２…第２取付け具、３…防振基体、８…液体封入室、９…ダイヤフラム、１１Ａ…第１液室、１１Ｂ…第２液室、１２…仕切り体、１５…弾性仕切り膜、１７，１８…変位規制部材、２５…オリフィス、５０…厚肉部、５１…薄肉部、５２…固定部、５４，８４…開口部、５３Ａ…第１リブ、５３Ｂ…第２リブ、５４Ａ，８４Ａ…第１開口、５４Ｂ，８４Ｂ…第２開口、６０…撹拌板、６１…撹拌板の外周縁、６２…第１液室の内周面、６３…第１液室側オリフィス、８１，１０１…第１リブ及び第２リブの頂部、８１Ａ，１０１Ａ…頂部部分、９１…薄肉部の一方の膜面、９２…厚肉部の外周面、９３…薄肉部の他方の膜面、９４…第１リブ及び第２リブの先端、９５…外方側の薄肉部部分、１０２，１０６…第２開口の内周縁、１２０…区画された薄肉部部分、１２２…第１開口と第２開口の間の変位規制部材部分、１２４…該変位規制部材部分に対向する薄肉部部分、１２６…液体の流路 DESCRIPTION OF SYMBOLS 1 ... 1st fixture, 2 ... 2nd fixture, 3 ... Anti-vibration base | substrate, 8 ... Liquid enclosure, 9 ... Diaphragm, 11A ... 1st liquid chamber, 11B ... 2nd liquid chamber, 12 ... Partition body, 15 ... elastic partition membranes, 17, 18 ... displacement regulating members, 25 ... orifice, 50 ... thick part, 51 ... thin part, 52 ... fixed part, 54, 84 ... opening, 53A ... first rib, 53B ... second Rib, 54A, 84A ... first opening, 54B, 84B ... second opening, 60 ... stirring plate, 61 ... outer peripheral edge of stirring plate, 62 ... inner peripheral surface of first liquid chamber, 63 ... first liquid chamber side orifice , 81, 101 ... top portions of the first and second ribs, 81A, 101A ... top portion, 91 ... one film surface of the thin portion, 92 ... outer peripheral surface of the thick portion, 93 ... other film surface of the thin portion 94, tips of the first rib and the second rib, 95, a thin portion on the outer side, 102, 106, a second opening. Inner peripheral edge, 120 ... compartmented thin portion, 122 ... displacement regulating member portion between the first opening and the second opening, the thin portions facing the 124 ... displacement restricting member portion, 126 ... liquid flow path

Claims

第１取付け具と、筒状の第２取付け具と、これらを連結するゴム状弾性体からなる防振基体と、前記第２取付け具に取り付けられて前記防振基体との間に液体封入室を形成するダイヤフラムと、前記液体封入室を前記防振基体側の第１液室と前記ダイヤフラム側の第２液室に仕切る仕切り体と、前記第１液室と第２液室を連通させるオリフィスとを備え、前記仕切り体は、弾性仕切り膜と、この弾性仕切り膜の変位量をその膜面の両側から規制する一対の変位規制部材とを備えてなり、前記一対の変位規制部材に、前記弾性仕切り膜の軸心方向視で互いに重複する開口部をそれぞれ形成してある液封入式防振装置であって、
前記開口部は、前記変位規制部材の径方向中央部に形成された第１開口と、この第１開口の周りに分散して形成された複数の第２開口とからなり、
前記弾性仕切り膜は、前記軸心方向視で前記第１開口内に位置する径方向中央部の厚肉部と、この厚肉部の径方向外方側に位置し、前記厚肉部の厚さ方向で前記厚肉部の中間部に位置するとともに前記一対の変位規制部材から離間して位置する薄肉部と、前記変位規制部材に対する外周側の固定部と、前記薄肉部の一方の膜面に設けられて頂部が一方の変位規制部材に当接可能な複数の第１リブと、前記薄肉部の他方の膜面に設けられて頂部が他方の変位規制部材に当接可能な複数の第２リブとからなり、
前記複数の第１リブ及び第２リブが、前記厚肉部に隣接する前記薄肉部の内周縁部において前記厚肉部の外周面から放射状に延設され、これにより、前記薄肉部の内周縁部が前記複数の第１リブ及び第２リブによって周方向に複数に区画され、
前記の区画された各薄肉部部分が、前記軸心方向において前記第１開口に臨んでおり、前記第１開口から該区画された各薄肉部部分に進入してきた液体を第２開口側に導く液体の流路が、前記第１開口と前記第２開口の間の変位規制部材部分とこれに対向する薄肉部部分との間に設けられた
ことを特徴とする液封入式防振装置。 A liquid sealing chamber is provided between the first fixture, the cylindrical second fixture, a vibration isolating base made of a rubber-like elastic body connecting them, and the vibration isolating base attached to the second fixture. Forming a diaphragm, a partition body for partitioning the liquid sealing chamber into a first liquid chamber on the vibration-proof base side and a second liquid chamber on the diaphragm side, and an orifice for communicating the first liquid chamber and the second liquid chamber The partition body includes an elastic partition membrane and a pair of displacement regulating members that regulate a displacement amount of the elastic partition membrane from both sides of the membrane surface. A liquid-filled vibration isolator in which openings overlapping each other in the axial direction of the elastic partition membrane are formed,
The opening includes a first opening formed in the radial center of the displacement regulating member and a plurality of second openings formed around the first opening.
The elastic partition membrane is positioned at a radially central portion located in the first opening as viewed in the axial direction and on a radially outward side of the thick portion, and the thickness of the thick portion is A thin portion positioned in the middle of the thick portion and spaced apart from the pair of displacement restricting members, a fixed portion on the outer peripheral side of the displacement restricting member, and one film surface of the thin portion A plurality of first ribs whose tops can come into contact with one displacement regulating member, and a plurality of first ribs that are provided on the other film surface of the thin part and whose tops can come into contact with the other displacement regulating member. It consists of 2 ribs,
The plurality of first ribs and second ribs extend radially from the outer peripheral surface of the thick portion at the inner peripheral portion of the thin portion adjacent to the thick portion, whereby the inner periphery of the thin portion The portion is divided into a plurality of circumferential directions by the plurality of first ribs and second ribs,
Each of the partitioned thin wall portions faces the first opening in the axial direction, and the liquid that has entered the partitioned thin wall portion from the first opening is guided to the second opening side. A liquid-filled vibration damping device, characterized in that a liquid flow path is provided between a displacement regulating member portion between the first opening and the second opening and a thin-walled portion facing the displacement restricting member portion.

前記弾性仕切り膜の径方向で、前記第１リブ及び第２リブの先端よりも外方側の薄肉部部分が前記一対の変位規制部材の第２開口を臨むように構成してある請求項１記載の液封入式防振装置。 2. The thin-walled portion on the outer side of the first rib and the second rib in the radial direction of the elastic partition membrane is configured to face the second opening of the pair of displacement regulating members. The liquid-filled vibration isolator as described.

前記第１リブの先端と前記第２リブの先端とが、前記複数の第２開口の内周縁よりも径方向内方側に位置している請求項１記載の液封入式防振装置。 Said first rib tip and between the leading end of the second rib, hydraulic antivibration device according to claim 1, characterized in that positioned radially inwardly of the inner periphery of the plurality of second openings.

前記第１リブの頂部のうち前記厚肉部から最も遠い頂部部分と、前記第２リブの頂部のうち前記厚肉部から最も遠い頂部部分とが、前記厚肉部の厚さ方向で前記厚肉部の外方側に突出している請求項１記載の液封入式防振装置。 The top part farthest from the thick part among the top parts of the first ribs, and the top part farthest from the thick part among the top parts of the second ribs are the thicknesses in the thickness direction of the thick part. hydraulic antivibration device according to claim 1 wherein the outwardly projecting side of the meat portion.

前記第１リブと前記第２リブが前記一対の変位規制部材で挟持された請求項１記載の液封入式防振装置。 The liquid-filled vibration isolator according to claim 1, wherein the first rib and the second rib are sandwiched between the pair of displacement regulating members.

前記第１リブと前記第２リブは、長手方向の横断面が前記頂部を頂点とする三角形状である請求項１記載の液封入式防振装置。 The liquid-filled vibration isolator according to claim 1, wherein the first rib and the second rib have a triangular cross-section in the longitudinal direction with the apex at the top.

前記第１液室内に撹拌板が設けられ、前記撹拌板の外周縁と前記第１液室の内周面との間に第１液室側オリフィスが形成されている請求項１記載の液封入式防振装置。 The liquid enclosure according to claim 1, wherein a stirring plate is provided in the first liquid chamber, and a first liquid chamber side orifice is formed between an outer peripheral edge of the stirring plate and an inner peripheral surface of the first liquid chamber. Type vibration isolator.