JP4740776B2 - Liquid-filled vibration isolator - Google Patents

Liquid-filled vibration isolator Download PDF

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JP4740776B2
JP4740776B2 JP2006079461A JP2006079461A JP4740776B2 JP 4740776 B2 JP4740776 B2 JP 4740776B2 JP 2006079461 A JP2006079461 A JP 2006079461A JP 2006079461 A JP2006079461 A JP 2006079461A JP 4740776 B2 JP4740776 B2 JP 4740776B2
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orifice forming
orifice
forming member
sandwiching
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英明 島津
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Toyo Tire Corp
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Toyo Tire and Rubber Co Ltd
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Description

本発明は、自動車エンジン等の振動発生体を防振的に支承するのに用いられる液封入式防振装置に関する。   The present invention relates to a liquid-filled vibration isolator used for vibration-proofing a vibration generator such as an automobile engine.

自動車エンジン等の振動発生体を、その振動を車体に伝達させないように支承する防振装置として、第１取付け具と、筒状の第２取付け具と、両取付け具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ゴム膜からなるダイヤフラムと、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、前記仕切り体を、前記第２取付け具の周壁部との間に前記オリフィスが形成される環状のオリフィス形成体と、前記オリフィス形成体の内周部に外周部が保持されて前記オリフィス形成体の内周面の間を塞ぐ弾性仕切り膜とで構成した液封入式防振装置が知られている（下記特許文献１参照）。   As a vibration isolator for supporting a vibration generating body such as an automobile engine so that the vibration is not transmitted to the vehicle body, a first mounting tool, a cylindrical second mounting tool, and a rubber-like elastic body that connects both mounting tools An anti-vibration substrate comprising: a diaphragm made of a rubber film that is attached to the second fixture and forms a liquid enclosure between the anti-vibration substrate; and the liquid enclosure chamber on the first anti-vibration substrate side. A partition that partitions the liquid chamber into 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 is formed with a peripheral wall portion of the second fixture. A liquid composed of an annular orifice forming body in which the orifice is formed, and an elastic partition film whose outer peripheral portion is held on the inner peripheral portion of the orifice forming body and blocks the inner peripheral surface of the orifice forming body. Enclosed vibration isolator is known See below Patent Document 1).

この種の液封入式防振装置では、大振幅振動が入力すると、液体がオリフィスを通って第１液室と第２液室間を流通し、その液体流動効果によって振動を減衰させる。そして、高周波数の微振幅の振動が入力すると、弾性仕切り膜が往復動変形することで、第１液室の液圧を吸収して動ばね定数の上昇を抑制する。   In this type of liquid-filled vibration isolator, when a large amplitude vibration is input, the liquid flows through the orifice between the first liquid chamber and the second liquid chamber, and the vibration is attenuated by the liquid flow effect. Then, when vibration with a high frequency and a small amplitude is input, the elastic partition membrane is reciprocally deformed to absorb the fluid pressure in the first fluid chamber and suppress an increase in the dynamic spring constant.

従来、前記オリフィス形成体の内周部で弾性仕切り膜の外周部を保持する手段としては、特許文献１に開示されるように、オリフィス形成体の内周部に形成した径方向内方に突出するフランジに、弾性仕切り膜の外周部を加硫接着する手段が採用されている。しかしながら、加硫接着による場合、弾性仕切り膜の成型時における金型によるゴムシールのための寸法をフランジに確保する必要があり、その分、弾性仕切り膜の径が小さくなってしまう。また、フランジの近傍では加硫接着のためゴムが固くなることから、かかるゴムの硬化分も考慮すると、弾性仕切り膜の有効径は一層小さくなる。その結果、第１液室の液圧を十分に吸収することが困難で、動ばね定数を十分に小さくすることが難しい。また、弾性仕切り膜の外周部を前記フランジに加硫接着する工程が必要で、加硫接着にコストがかかるという問題もある。   Conventionally, as a means for holding the outer peripheral portion of the elastic partition membrane at the inner peripheral portion of the orifice forming body, as disclosed in Patent Document 1, it protrudes inward in the radial direction formed on the inner peripheral portion of the orifice forming body. A means for vulcanizing and adhering the outer peripheral portion of the elastic partition membrane is employed for the flange. However, in the case of vulcanization adhesion, it is necessary to secure a dimension for the rubber seal by the mold at the time of molding of the elastic partition membrane to the flange, and accordingly, the diameter of the elastic partition membrane is reduced. Further, since the rubber becomes hard due to vulcanization adhesion in the vicinity of the flange, the effective diameter of the elastic partition membrane is further reduced in consideration of the amount of hardening of the rubber. As a result, it is difficult to sufficiently absorb the fluid pressure in the first fluid chamber, and it is difficult to sufficiently reduce the dynamic spring constant. In addition, there is a problem that a step of vulcanizing and bonding the outer peripheral portion of the elastic partition film to the flange is necessary, and vulcanization bonding is costly.

一方、この種の液封入式防振装置においては、高周波数の振動に対する防振効果を更に高めるために、第１液室内に撹拌板を設け、該撹拌板の外周縁と防振基体の内周面との間に第２のオリフィスを形成することがある（下記特許文献２参照）。この場合、第２の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で、当該高周波数振動が減衰される。しかしながら、特許文献２のように、撹拌板を上側の第１取付け具から防振基体を貫通する支持軸の下端に取付けて、第１液室内において傘状に設けた場合、第１取付け具の下方への大変位時に撹拌板が仕切り体に当接するおそれがあり、異音の原因となる。   On the other hand, in this type of liquid-filled vibration isolator, a stirrer plate is provided in the first liquid chamber to further enhance the vibration isolating effect against high-frequency vibrations, A second orifice may be formed between the peripheral surface (see Patent Document 2 below). In this case, the high-frequency vibration is attenuated by resonating the liquid flowing through the second orifice in the high-frequency range. However, as in Patent Document 2, when the stirring plate is attached to the lower end of the support shaft that penetrates the vibration-proofing base from the upper first fixture, and provided in an umbrella shape in the first liquid chamber, the first fixture The stirring plate may come into contact with the partition during large downward displacement, causing abnormal noise.

ところで、下記特許文献３には、ゴム可動板の外周部を上下のオリフィス形成部材の間で挟持してなる仕切り体を備える液封入式防振装置が開示されている。しかしながら、このゴム可動板は、中央部が球面状に膨出形成されることで弾性変形が抑制されたものであり、また、上下のストッパ部間で挟持されることにより、各ストッパ部の規制範囲内で移動するよう構成されている。そのため、第１液室と第２液室の間での上下両方向への比較的大きな弾性変形を許容する弾性仕切り膜というよりも、むしろ両液室間で微小距離変位するように制限された可動板に相当するものである。また、外周部が固定されたゴム可動板は、上下のストッパ部で変位を制限される際に、外周部の径方向内方側の薄肉部分が該ストッパ部に衝突することで異音が発生する。   By the way, the following Patent Document 3 discloses a liquid-filled vibration isolator including a partition body in which an outer peripheral portion of a rubber movable plate is sandwiched between upper and lower orifice forming members. However, this rubber movable plate has a central portion that bulges into a spherical shape, so that elastic deformation is suppressed. Further, the rubber movable plate is sandwiched between upper and lower stopper portions, thereby restricting each stopper portion. It is configured to move within range. Therefore, rather than an elastic partition membrane that allows relatively large elastic deformation in both the upper and lower directions between the first liquid chamber and the second liquid chamber, the movable that is limited to be displaced by a small distance between the two liquid chambers. It corresponds to a plate. In addition, when the displacement of the rubber movable plate with the outer peripheral part fixed is restricted by the upper and lower stopper parts, abnormal noise occurs due to the thin part on the radially inner side of the outer peripheral part colliding with the stopper part. To do.

また、下記特許文献４には、仕切り体を構成する可動ゴム板を、中央部分における厚肉板状の可動板部と、外周部分における薄肉の可動膜部と、可動膜部の外周縁部に設けられた厚肉の外周挟持部とで構成し、上下の保持部材により可動板部の外周縁部と外周挟持部を圧縮状態に挟持固定することが開示されている。この防振装置では、厚肉板状の可動板部と、その外周の可動膜部とにより、可動ゴム板に対して、微小距離変位する可動板的な特性と、柔らかい可動膜的な特性とを併せ持たせようとしている。しかしながら、上記可動ゴム板の大部分は厚肉の可動ゴム板からなるものであり、その上下両側には隙間を隔てて変位規制部材が設けられていることから、実質的には可動板タイプに属するものであり、そのため、変位規制部材との衝突による異音発生が懸念される。   Further, in Patent Document 4 below, the movable rubber plate constituting the partition body is provided on the thick plate-like movable plate portion in the central portion, the thin movable film portion in the outer peripheral portion, and the outer peripheral edge portion of the movable film portion. It is disclosed that the outer peripheral edge portion and the outer periphery holding portion of the movable plate portion are held and fixed in a compressed state by upper and lower holding members. In this vibration isolator, the thick plate-like movable plate portion and the movable film portion on the outer periphery thereof have a movable plate-like characteristic that is displaced by a minute distance with respect to the movable rubber plate, and a soft movable film-like property. Is trying to have both. However, most of the movable rubber plate is made of a thick movable rubber plate, and a displacement regulating member is provided on both the upper and lower sides with a gap therebetween. Therefore, there is a concern about the generation of abnormal noise due to the collision with the displacement regulating member.

また、下記特許文献５には、ゴム弾性板の外周縁部の厚肉挟持部が上下のオリフィス形成部材により固定的に挟持された仕切り体が開示されている。しかしながら、この文献は、第１液室での過大な負圧に起因する異音を防止するために、ゴム弾性板の第１液室側への自由な変形を許容するようにしたものにすぎず、第２液室側への変位は微小隙間を介して設けられた変位規制部材により制限されている。また、該ゴム弾性板は、厚肉挟持部の径方向内方側の本体部分では、その全体がオリフィス形成部材から離隔位置せしめられて非拘束状態で配設されており（段落００３７参照）、そのため、ゴム弾性板の下面側はもちろん、上面側についても外周部が係止片に衝突することにより異音が発生する。   Patent Document 5 below discloses a partition body in which a thick sandwiching portion of the outer peripheral edge of a rubber elastic plate is fixedly sandwiched by upper and lower orifice forming members. However, this document only allows free deformation of the rubber elastic plate toward the first liquid chamber in order to prevent abnormal noise caused by excessive negative pressure in the first liquid chamber. However, the displacement toward the second liquid chamber is limited by a displacement regulating member provided through a minute gap. Further, the rubber elastic plate is disposed in an unconstrained state in a body portion on the radially inner side of the thick sandwiching portion, being positioned away from the orifice forming member (see paragraph 0037), Therefore, not only the lower surface side of the rubber elastic plate but also the upper surface side generates an abnormal noise when the outer peripheral portion collides with the locking piece.

下記特許文献６には、ゴム製の膜体をオリフィス部材のケース体とその下面側のカバー体との間に挟持する点が開示されているが、膜体の外周部の膨出した固定部を圧縮状態に挟持しているだけであり、その径方向内方側の固定部近傍の膜体部分については圧縮状態に挟持されていない。そのため、振動入力時に該膜体部分がケース体やカバー体から離れて衝突することによる異音の発生が懸念される。
特開平９−３２９１８０号公報 特開２００５−１８０５４２号公報 特開平３−２８８０３５号公報 特開２００３−７４６１７号公報 特開２００３−１３９１８９号公報 特開２００４−１４４２３７号公報 The following Patent Document 6 discloses that a rubber film body is sandwiched between a case body of an orifice member and a cover body on the lower surface side thereof, but a fixed portion in which an outer peripheral portion of the film body bulges out. Is only sandwiched in the compressed state, and the film body portion in the vicinity of the radially inner fixed portion is not sandwiched in the compressed state. Therefore, there is a concern about the generation of abnormal noise due to the film body portion colliding away from the case body or the cover body at the time of vibration input.
JP-A-9-329180 JP 2005-180542 A JP-A-3-288035 JP 2003-74617 A JP 2003-139189 A JP 2004-144237 A

本発明の主たる目的は、高周波数の振動が入力したときに第１液室の液圧を十分に吸収することができ、製作コストを低廉化できる液封入式防振装置を提供する点にある。   The main object of the present invention is to provide a liquid-filled vibration isolator capable of sufficiently absorbing the liquid pressure in the first liquid chamber when high-frequency vibration is input, and reducing the manufacturing cost. .

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、前記第１取付け具と第２取付け具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ゴム膜からなるダイヤフラムと、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液室を連通させる第１のオリフィスとを備え、前記仕切り体が、前記第２取付け具の周壁部との間に前記第１のオリフィスが形成される環状のオリフィス形成体と、前記オリフィス形成体の内周部に外周部が保持されて前記オリフィス形成体の内周面の間を塞ぐ弾性仕切り膜とからなるものである。そして、前記オリフィス形成体は、前記第１のオリフィスを形成するためのオリフィス溝を外周部に備えた環状の第１オリフィス形成部材と、前記第１オリフィス形成部材に内嵌された環状の第２オリフィス形成部材とで構成され、また、これら第１オリフィス形成部材と第２オリフィス形成部材に第１挟持部と第２挟持部が各別に設けられて、前記第１挟持部と第２挟持部とにより前記弾性仕切り膜の外周部が前記オリフィス形成体の軸芯方向で挟持されている。また、前記第１液室を前記防振基体側の主室と前記弾性仕切り膜側の副室とに仕切る仕切り部が前記第２オリフィス形成部材に一体に設けられ、前記仕切り部に前記主室と副室を連通させる第２のオリフィスが形成されている。また、前記弾性仕切り膜の外周部が一方の膜面の外方側と他方の膜面の外方側に膨出した膨出部に形成され、前記第１挟持部と第２挟持部が、前記弾性仕切り膜の径方向で前記膨出部よりも内方側の弾性仕切り膜部分と前記膨出部とからなる被挟持部を前記オリフィス形成体の軸芯方向で挟持するものであり、前記弾性仕切り膜部分の第１被挟持面と、前記第１被挟持面に対する前記第１挟持部の第１挟持面との間、及び、前記弾性仕切り膜部分の第２被挟持面と、前記第２被挟持面に対する前記第２挟持部の第２挟持面との間に、振動入力時にも隙間が形成されないように、前記弾性仕切り膜部分が前記第１挟持部と第２挟持部とにより圧縮状態に挟持されている。以上を基本構成とする。 A liquid-filled vibration isolator according to the present invention includes a first mounting tool, a cylindrical second mounting tool, and a vibration-proof base made of a rubber-like elastic body that connects the first mounting tool and the second mounting tool. A diaphragm made of a rubber film that is attached to the second fixture and forms a liquid sealing chamber between the vibration isolating base and the first liquid chamber on the side of the vibration isolating base and the diaphragm side. And a first orifice that allows the first liquid chamber and the second liquid chamber to communicate with each other, and the partition is between the peripheral wall portion of the second fixture. An annular orifice forming body in which the first orifice is formed, and an elastic partition film in which an outer peripheral portion is held on an inner peripheral portion of the orifice forming body and blocks between the inner peripheral surfaces of the orifice forming body. is there. The orifice forming body includes an annular first orifice forming member provided with an orifice groove for forming the first orifice on an outer peripheral portion, and an annular second member fitted in the first orifice forming member. An orifice forming member, and a first sandwiching portion and a second sandwiching portion are provided on the first and second orifice forming members, respectively, and the first sandwiching portion and the second sandwiching portion are provided. Thus, the outer peripheral portion of the elastic partition membrane is held in the axial direction of the orifice forming body. In addition, a partition portion for partitioning the first liquid chamber into a main chamber on the vibration isolating base side and a sub chamber on the elastic partition membrane side is provided integrally with the second orifice forming member, and the main chamber is provided in the partition portion. And a second orifice that communicates with the sub chamber. Further, the outer peripheral portion of the elastic partition membrane is formed in a bulging portion that bulges on the outer side of one membrane surface and the outer side of the other membrane surface, and the first clamping portion and the second clamping portion are A sandwiched portion composed of an elastic partition membrane portion inward of the bulging portion and the bulging portion in the radial direction of the elastic partition membrane and the bulging portion is sandwiched in the axial direction of the orifice forming body, Between the first sandwiched surface of the elastic partition membrane portion and the first sandwiching surface of the first sandwiching portion with respect to the first sandwiched surface, the second sandwiched surface of the elastic partition membrane portion, and the first 2 The elastic partition membrane portion is compressed by the first clamping portion and the second clamping portion so that no gap is formed between the second clamping surface of the second clamping portion and the second clamping surface even when vibration is input. It is pinched in the state. The above is the basic configuration.

上記構成によれば、第１オリフィス形成部材に設けられた第１挟持部と、第２オリフィス形成部材に設けられた第２挟持部とが、弾性仕切り膜の外周部をオリフィス形成体の軸芯方向で挟持する。これにより、第１オリフィス形成部材と第２オリフィス形成部材からなるオリフィス形成体の内周部に、弾性仕切り膜の外周部を加硫接着するための径方向内方側に突出するフランジを形成しなくても済み、また、加硫接着の場合のように外周部が硬化することもないので、弾性仕切り膜の有効径を大きくすることができる。その結果、高周波数の振動が入力したときに、第１液室の液圧を十分に吸収することができる。また、弾性仕切り膜の外周部を前記フランジに加硫接着するための加硫接着工程が不要になるため、製作コストを低廉化できる。   According to the above configuration, the first sandwiching portion provided in the first orifice forming member and the second sandwiching portion provided in the second orifice forming member use the outer peripheral portion of the elastic partition film as the axis of the orifice forming body. Hold in the direction. As a result, a flange projecting radially inward for vulcanizing and bonding the outer peripheral portion of the elastic partition membrane is formed on the inner peripheral portion of the orifice forming body composed of the first orifice forming member and the second orifice forming member. It is not necessary, and since the outer peripheral portion is not cured unlike the case of vulcanization adhesion, the effective diameter of the elastic partition membrane can be increased. As a result, when high-frequency vibration is input, the fluid pressure in the first fluid chamber can be sufficiently absorbed. Further, since the vulcanization bonding step for vulcanizing and bonding the outer peripheral portion of the elastic partition film to the flange is not required, the manufacturing cost can be reduced.

また、第１液室を仕切り部で主室と副室とに仕切るとともに、これら主室と副室を第２のオリフィスで連通させたことにより、第２のオリフィスを流れる液体の作用によって動ばね定数を小さくすることができる。すなわち、所定の振動数の振動が入力したときに、第２のオリフィスを流れる液体を共振させるように第２のオリフィスの断面積や長さ等を設定することで、所定の振動数の振動が入力したときに動ばね定数を小さくすることができる。また、上記第２オリフィスを備える仕切り部を第２オリフィス形成部材に一体に設けたことにより、上記従来の傘状の撹拌板の場合における大変位時の異音を回避することができ、また、液封入式防振装置の組み立て作業性および精度にも優れる。   Further, the first liquid chamber is divided into a main chamber and a sub chamber by a partition portion, and the main chamber and the sub chamber are communicated by the second orifice, so that the dynamic spring is acted on by the action of the liquid flowing through the second orifice. The constant can be reduced. That is, when a vibration having a predetermined frequency is input, by setting the cross-sectional area and length of the second orifice so that the liquid flowing through the second orifice is resonated, the vibration having the predetermined frequency is generated. When input, the dynamic spring constant can be reduced. Further, by providing the partition portion including the second orifice integrally with the second orifice forming member, it is possible to avoid abnormal noise at the time of large displacement in the case of the conventional umbrella-shaped stirring plate, It also excels in assembly workability and accuracy of the liquid-filled vibration isolator.

また、上記弾性仕切り膜部分とその両側の第１及び第２挟持部との間に振動入力時にも隙間が形成されないように、該弾性仕切り膜部分を圧縮状態に挟持したことにより、振動入力時に、弾性仕切り膜部分が第１及び第２挟持部に衝突することがなくなり、これらの衝突に起因する異音の発生を回避することができる。 In addition , by holding the elastic partition membrane portion in a compressed state so that no gap is formed even when vibration is input between the elastic partition membrane portion and the first and second holding portions on both sides thereof, The elastic partition membrane portion does not collide with the first and second holding portions, and generation of abnormal noise due to these collisions can be avoided.

請求項１記載の発明は、上記基本構成において、前記第１挟持部が前記第１オリフィス形成部材の内周部から径方向内方に向けて突設されており、前記第１挟持部は、前記第１オリフィス形成部材の軸芯方向における一方面側に前記第１挟持面を備えるとともに、他方面側が径方向内方ほど前記一方面側に近づくように傾斜した傾斜面部に形成されている。かかる傾斜面部を第１挟持部に設けることにより、径方向内方側の弾性仕切り膜部分に対する高い押圧力を付与することができ、該弾性仕切り膜部分を所望の圧縮状態に安定して挟持することができる。 The invention according to claim 1 is the above basic configuration , wherein the first sandwiching portion protrudes radially inward from an inner peripheral portion of the first orifice forming member, and the first sandwiching portion includes: provided with a first clamping face on one side in the axial direction of the first orifice-forming member, it is formed on the inclined surface portion which is inclined so as to approach to the one side the other side is more radially inward. By providing such an inclined surface portion in the first clamping portion, a high pressing force can be applied to the radially inner elastic partition membrane portion, and the elastic partition membrane portion can be stably held in a desired compressed state. be able to.

請求項２記載の発明は、上記基本構成において、前記第２オリフィス形成部材が、前記第１オリフィス形成部材に内嵌する外側筒部と、前記外側筒部から径方向内方に向けて突設された前記第２挟持部と、前記第２挟持部から径方向内方に延設された前記仕切り部とからなり、前記仕切り部が、前記外側筒部によって取り囲まれる内側筒部と、前記内側筒部と前記第２挟持部を連結する連結部とからなり、前記内側筒部の中空部が前記オリフィス形成体の軸芯方向に開口する前記第２のオリフィスを構成している。また、前記第２挟持部は、前記第２オリフィス形成部材の軸芯方向における一方面側に前記第２挟持面を備えるとともに、他方面側には周方向に複数のリブが前記外側筒部から前記連結部にわたらせて設けられている。 According to a second aspect of the present invention, in the basic configuration described above , the second orifice forming member is provided so as to project radially outward from the outer cylindrical portion, the outer cylindrical portion being fitted into the first orifice forming member. The second sandwiching portion and the partition portion extending radially inward from the second sandwiching portion, the inner tubular portion surrounded by the outer tubular portion, and the inner side It consists of a connecting part that connects the cylindrical part and the second clamping part, and the hollow part of the inner cylindrical part constitutes the second orifice that opens in the axial direction of the orifice forming body . The second clamping portion includes the second clamping surface on one surface side in the axial direction of the second orifice forming member, and a plurality of ribs in the circumferential direction on the other surface side from the outer cylindrical portion. It is provided over the connecting portion.

このようなリブを第２挟持部に設けることにより、上記弾性仕切り膜部分に対する高い押圧力を付与することができ、該弾性仕切り膜部分を所望の圧縮状態に安定して挟持することができる。 By providing the ribs, such as this to the second clamping portion, it is possible to impart a high pressing force against the elastic partition membrane portion, it is possible to hold the elastic partition membrane portion stably in a desired compression .

本発明においては、前記弾性仕切り膜の膨出部における外周縁に径方向外方に突出するシール突条が設けられ、前記シール突条が前記第１オリフィス形成部材と第２オリフィス形成部材とにより圧縮状態に挟持されてもよい。これにより、弾性仕切り膜の外周部における液体のシール性を向上することができる。   In the present invention, a seal ridge projecting radially outward is provided on an outer peripheral edge of the bulging portion of the elastic partition membrane, and the seal ridge is formed by the first orifice forming member and the second orifice forming member. It may be clamped in a compressed state. Thereby, the sealing performance of the liquid in the outer peripheral part of an elastic partition film can be improved.

請求項３記載の発明は、上記基本構成において、前記弾性仕切り膜部分の前記第１被挟持面と前記第２被挟持面にそれぞれ圧縮用凸部が設けられ、前記圧縮用凸部が前記第１挟持部及び第２挟持部の内周縁を越えて径方向内方側に延在している。該圧縮用凸部は第１挟持部と第２挟持部との挟持により圧縮され、振動入力時における上記隙間の発生を一層効果的に抑制することができる。また、該圧縮用凸部が前記第１挟持部及び第２挟持部の内周縁を越えて径方向内方側に延在しているので、該内周縁での弾性仕切り膜の肉厚が上記凸部による増肉分だけ大きくなり、そのため、該内周縁での弾性仕切り膜の亀裂発生を抑えることができる。 According to a third aspect of the present invention, in the basic configuration, a compression convex portion is provided on each of the first sandwiched surface and the second sandwiched surface of the elastic partition film portion, and the compression convex portion is the first sandwiched surface . It extends radially inward beyond the inner peripheral edges of the first clamping part and the second clamping part . The compression convex portion is compressed by clamping between the first clamping portion and the second clamping portion, and the generation of the gap at the time of vibration input can be more effectively suppressed. Moreover, since the compressed projection extends radially inwardly beyond the inner peripheral edge of said first clamping portion and a second clamping portion, the thickness of the elastic partition membrane with the inner periphery above only thickened caused by the convex portion increases Ri name, therefore, it is possible to suppress the cracking of the elastic partition membrane with the inner peripheral edge.

本発明においては、前記第２オリフィス形成部材が、前記第１オリフィス形成部材に軸芯方向の一端部側から内嵌し、前記第２オリフィス形成部材の軸芯方向の一端部側に張り出し形成されたフランジが、前記第１オリフィス形成部材の軸芯方向の一端部側に形成された環状の凹部に、前記オリフィス形成体の軸芯方向で受け止められ、前記第２オリフィス形成部材の軸芯方向の他端部に前記第２挟持部が形成され、前記第１挟持部は、前記オリフィス形成体の軸芯方向において前記第２挟持部に相対するように、前記第１オリフィス形成部材の内周部から径方向内方側に張り出す状態に第１オリフィス形成部材の内周部に形成されてもよい。   In the present invention, the second orifice forming member is fitted into the first orifice forming member from one end side in the axial direction, and is formed to project to one end side in the axial direction of the second orifice forming member. A flange is received in an annular recess formed on one end side in the axial direction of the first orifice forming member in the axial direction of the orifice forming body, and in the axial direction of the second orifice forming member. The second clamping part is formed at the other end, and the first clamping part is an inner peripheral part of the first orifice forming member so as to face the second clamping part in the axial direction of the orifice forming body. May be formed on the inner peripheral portion of the first orifice forming member so as to project radially inward from the first orifice forming member.

この場合、第２オリフィス形成部材のフランジが第１オリフィス形成部材の凹部に軸芯方向に受け止められることで、オリフィス形成体の軸芯方向における第２オリフィス形成部材の位置（第１オリフィス形成部材に対する位置）を正確に決めることができる。また、オリフィス形成体の軸芯方向における第１挟持部と第２挟持部の位置（すなわち間隔）を正確に決めることができ、第１挟持部と第２挟持部で弾性仕切り膜部分を所望の力で挟持でき、振動入力時に、弾性仕切り膜部分と第１及び第２挟持部との間に上記隙間がより確実に発生しないようにすることができる。   In this case, the flange of the second orifice forming member is received in the concave portion of the first orifice forming member in the axial direction, whereby the position of the second orifice forming member in the axial direction of the orifice forming body (relative to the first orifice forming member). Position) can be determined accurately. In addition, the position (that is, the interval) between the first sandwiching portion and the second sandwiching portion in the axial center direction of the orifice forming body can be accurately determined, and the elastic partition film portion can be formed in a desired manner by the first sandwiching portion and the second sandwiching portion. It can be held by force, and when the vibration is input, the above-described gap can be prevented from being generated more reliably between the elastic partition membrane portion and the first and second holding portions.

本発明においては、前記ダイヤフラムの外周部が環状の取付け板の内周部に加硫接着して、前記取付け板の外周部が前記第２取付け具の内周部に固定され、前記オリフィス形成体は、前記取付け板と、前記防振基体に形成された受け部とにより前記オリフィス形成体の軸芯方向で挟持固定され、前記受け部は、前記第１オリフィス形成部材の軸芯方向の一端部側の端面に圧接する環状の外側受け部分と、前記端面及び前記フランジに圧接する内側受け部分とからなり、前記内側受け部分は、前記第２取付け具の周方向に並ぶ複数の受け止め突部を前記外側受け部分から径方向内方側に突出させて構成されてもよい。   In the present invention, the outer peripheral portion of the diaphragm is vulcanized and bonded to the inner peripheral portion of the annular mounting plate, and the outer peripheral portion of the mounting plate is fixed to the inner peripheral portion of the second mounting tool. Is clamped and fixed in the axial direction of the orifice forming body by the mounting plate and a receiving portion formed on the vibration-proof base, and the receiving portion is one end portion of the first orifice forming member in the axial direction. An annular outer receiving portion that is in pressure contact with the side end surface, and an inner receiving portion that is in pressure contact with the end surface and the flange. The inner receiving portion includes a plurality of receiving protrusions arranged in the circumferential direction of the second fixture. It may be configured to protrude radially inward from the outer receiving portion.

この場合、前記外側受け部分が、第１オリフィス形成部材の軸芯方向の一端部側の端面に圧接し、内側受け部分が前記端面及び前記フランジに圧接するから、オリフィス形成体を第１オリフィス形成部材と第２オリフィス形成部材とに分割した構造でありながら、オリフィス形成体をそのオリフィス形成体の軸芯方向で強固に挟持固定することができる。前記内側受け部分は、前記第２取付け具の周方向に並ぶ複数の受け止め突部を前記外側受け部分から径方向内方に突出させて構成されているから、受け部のボリュームが大きくなりすぎるのを回避することができる。   In this case, the outer receiving portion is in pressure contact with the end surface of the first orifice forming member on the one end side in the axial direction, and the inner receiving portion is in pressure contact with the end surface and the flange. Although the structure is divided into the member and the second orifice forming member, the orifice forming body can be firmly clamped and fixed in the axial direction of the orifice forming body. Since the inner receiving portion is configured by projecting a plurality of receiving protrusions arranged in the circumferential direction of the second fixture inward in the radial direction from the outer receiving portion, the volume of the receiving portion becomes too large. Can be avoided.

本発明においては、前記膨出部が縦断面円弧状に形成され、前記第１挟持部に前記一方の膜面側の膨出部分を密嵌させる縦断面円弧状の第１嵌合凹部が形成され、前記第２挟持部に前記他方の膜面側の膨出部分を密嵌させる縦断面円弧状の第２嵌合凹部が形成されてもよい。この場合、膨出部とこれに密嵌する第１及び第２嵌合凹部がいずれも縦断面円弧状に形成されているので、これらの密着性を高めて第１液室と第２液室との間のシール性を向上することができる。   In the present invention, the bulging portion is formed in an arc shape in the longitudinal section, and the first fitting recess having an arc shape in the longitudinal section for tightly fitting the bulging portion on the one film surface side is formed in the first sandwiching portion. In addition, a second fitting recess having an arcuate cross section for tightly fitting the bulging portion on the other film surface side may be formed in the second sandwiching portion. In this case, since the bulging portion and the first and second fitting recesses closely fitted to the bulging portion are both formed in a circular arc shape in the longitudinal section, the first liquid chamber and the second liquid chamber are improved by improving their adhesion. The sealing property between the two can be improved.

本発明によれば、高周波数の振動が入力したときに第１液室の液圧を十分に吸収することができ、製作コストを低廉化することができる。   According to the present invention, when high-frequency vibration is input, the fluid pressure in the first fluid chamber can be sufficiently absorbed, and the manufacturing cost can be reduced.

［第１実施形態］
図１に液封入式防振装置１００を示してある。この装置１００は、自動車のエンジンに取り付けられる横断面円形の上側の第１取付け金具１と、エンジンの下方の車体フレームに取り付けられる段付き円筒状の下側の第２取付け金具２と、これらを連結するゴム状弾性体からなる防振基体３とを備えている。 [First Embodiment]
FIG. 1 shows a liquid-filled vibration isolator 100. The apparatus 100 includes a first mounting bracket 1 having a circular cross section attached to an automobile engine, a stepped cylindrical lower second mounting bracket 2 attached to a vehicle body frame below the engine, and these. And an anti-vibration base 3 made of a rubber-like elastic body to be connected.

第１取付け金具１は取付けボルトに対する雌ねじ部６を備えている。防振基体３は円錐台形状に形成され、その上端部が第１取付け金具１に、下端部が第２取付け金具２にそれぞれ加硫接着されている。防振基体３の下端部に、第２取付け金具２の内周面を覆うゴム膜状のシール壁部７が連なっている。   The first mounting bracket 1 includes a female thread portion 6 for a mounting bolt. The anti-vibration base 3 is formed in a truncated cone shape, and its upper end is vulcanized and bonded to the first mounting bracket 1 and its lower end is bonded to the second mounting bracket 2. A rubber film-like seal wall portion 7 covering the inner peripheral surface of the second mounting bracket 2 is connected to the lower end portion of the vibration-isolating base 3.

第２取付け金具２の下端部には、防振基体３の下面との間に液体封入室８を形成する可撓性のゴム膜からなるダイヤフラム９が取り付けられている。ダイヤフラム９は、上方の防振基体３側に膨らんだ部分球状をなしており、外周部９Ｇが円環状の取付け板１３の内周部１３Ｎに加硫接着されて、該取付け板１３の外周部１３Ｇが第２取付け金具２の内周部２Ｎに固定されている。   A diaphragm 9 made of a flexible rubber film is attached to the lower end portion of the second mounting bracket 2 so as to form a liquid sealing chamber 8 between the lower surface of the vibration isolating base 3. The diaphragm 9 has a partially spherical shape that swells toward the upper vibration-proof base 3, and the outer peripheral portion 9 </ b> G is vulcanized and bonded to the inner peripheral portion 13 </ b> N of the annular mounting plate 13. 13G is fixed to the inner peripheral portion 2N of the second mounting bracket 2.

上記液体封入室８には液体が封入されており、該液体封入室８は、第２取付け金具２の内周部２Ｎにシール壁部７を介して嵌着保持された仕切り体１２により、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とに仕切り構成されている。そして、第１液室１１Ａと第２液室１１Ｂを連通させる液体流路である第１のオリフィス２５が設けられている。   A liquid is sealed in the liquid sealing chamber 8, and the liquid sealing chamber 8 is protected by a partition body 12 fitted and held on the inner peripheral portion 2N of the second mounting bracket 2 via a seal wall portion 7. The first liquid chamber 11A on the vibration base 3 side and the second liquid chamber 11B on the diaphragm 9 side are partitioned. And the 1st orifice 25 which is a liquid flow path which connects 11A of 1st liquid chambers and the 2nd liquid chamber 11B is provided.

図１〜３に示すように、仕切り体１２は、第２取付け金具２の周壁部２８との間に第１のオリフィス２５が形成される円環状のオリフィス形成体１６と、オリフィス形成体１６の内周部１６Ｎに外周部が保持されてオリフィス形成体１６の内周面１６Ｍの間を塞ぐ薄肉ゴム製の弾性仕切り膜１５とからなる。弾性仕切り膜１５は、平らな円板状に形成されており、オリフィス形成体１６の軸芯方向Ｇの両側（即ち、上側の第１液室１１Ａと下側の第２液室１１Ｂの両方向）に自身の膜厚（肉厚）以上に変位（変形）可能に設けられている。すなわち、弾性仕切り膜１５は外周部を除いて略一定の肉厚の薄肉状に形成されており、その上下両側には弾性仕切り膜１５の変位を規制する部材が設けられていない。なお、第１のオリフィス２５は前記周壁部２８に沿うように円環状に形成されており、第１開口（図示せず）を介して第１液室１１Ａ（より詳細には、後記の主室１１Ａ１）と連通し、第２開口（図示せず）を介して第２液室１１Ｂと連通している。   As shown in FIGS. 1 to 3, the partition body 12 includes an annular orifice forming body 16 in which a first orifice 25 is formed between the peripheral wall portion 28 of the second mounting bracket 2, and an orifice forming body 16. The outer peripheral portion is held by the inner peripheral portion 16N, and the elastic partition membrane 15 made of thin rubber that closes the space between the inner peripheral surfaces 16M of the orifice forming body 16 is formed. The elastic partition film 15 is formed in a flat disk shape, and both sides of the orifice forming body 16 in the axial direction G (that is, both directions of the upper first liquid chamber 11A and the lower second liquid chamber 11B). It can be displaced (deformed) beyond its own film thickness (wall thickness). That is, the elastic partition film 15 is formed in a thin shape with a substantially constant thickness except for the outer peripheral portion, and no member for restricting the displacement of the elastic partition film 15 is provided on both upper and lower sides thereof. The first orifice 25 is formed in an annular shape along the peripheral wall portion 28, and the first liquid chamber 11A (more specifically, a main chamber described later) is formed through a first opening (not shown). 11A1) and the second liquid chamber 11B through a second opening (not shown).

オリフィス形成体１６は、第１のオリフィス２５を形成するためのオリフィス溝２５Ｇを外周部１７Ｇに備えた円環状の第１オリフィス形成部材１７と、第１オリフィス形成部材１７に内嵌固着された円環状の第２オリフィス形成部材１８とで構成されている。両者１７，１８は樹脂材で形成され、両者の接合面１９が超音波溶着などの固定手段で接着されている。   The orifice forming body 16 includes an annular first orifice forming member 17 provided with an orifice groove 25G for forming the first orifice 25 in the outer peripheral portion 17G, and a circle fitted and fixed to the first orifice forming member 17. And an annular second orifice forming member 18. Both 17 and 18 are formed of a resin material, and the joint surface 19 of both is bonded by a fixing means such as ultrasonic welding.

弾性仕切り膜１５の外周部は、厚み方向の両側、即ち、一方の膜面１５Ｍ１の外方側Ｐ１と他方の膜面１５Ｍ２の外方側Ｐ２にそれぞれ膨出した縦断面円弧状の膨出部４１に構成されており、該膨出部４１が弾性仕切り膜１５の外周部に全周にわたって環状に形成されている。そして、この膨出部４１と、弾性仕切り膜１５の径方向で膨出部４１よりも内方側の弾性仕切り膜部分４５とで被挟持部４６が構成されている。ここで、前記弾性仕切り膜部分４５は、膨出部４１の径方向内方側における肉厚一定の弾性仕切り膜の本体部分であって膨出部４１に隣接した近傍部分である。   The outer peripheral portion of the elastic partition film 15 is a bulged portion having an arcuate cross section that bulges on both sides in the thickness direction, that is, on the outer side P1 of one film surface 15M1 and the outer side P2 of the other film surface 15M2. 41, and the bulging portion 41 is formed in an annular shape on the outer peripheral portion of the elastic partition film 15 over the entire circumference. The bulging portion 41 and the elastic partition membrane portion 45 located inward of the bulging portion 41 in the radial direction of the elastic partition membrane 15 constitute a sandwiched portion 46. Here, the elastic partition membrane portion 45 is a main body portion of the elastic partition membrane having a constant thickness on the radially inner side of the bulging portion 41 and is a vicinity portion adjacent to the bulging portion 41.

第１オリフィス形成部材１７と第２オリフィス形成部材１８には、上記弾性仕切り膜１５の被挟持部４６を、オリフィス形成体１６の軸芯方向Ｇで挟持する第１挟持部４と第２挟持部５が各別に設けられている。すなわち、第１オリフィス形成部材１７に第１挟持部４が設けられ、第２オリフィス形成部材１８に第２挟持部５が設けられている。   In the first orifice forming member 17 and the second orifice forming member 18, the first sandwiching portion 4 and the second sandwiching portion that sandwich the sandwiched portion 46 of the elastic partition film 15 in the axial direction G of the orifice forming body 16. 5 is provided for each. That is, the first holding part 4 is provided on the first orifice forming member 17, and the second holding part 5 is provided on the second orifice forming member 18.

第１挟持部４は、第１オリフィス形成部材１７の内周部１７Ｎから径方向内方Ｋ１に向けて突設され、即ち張り出す状態に該内周部１７Ｎに形成されている。第１挟持部４は、図２に示すように、膨出部４１の下半分４１Ｓ（一方の膜面側の膨出部分に相当）をきつく嵌合（密嵌）させる縦断面円弧状の第１嵌合凹部５１と、その径方向内側において弾性仕切り膜部分４５の扁平な第１被挟持面４５Ｍ１に対する扁平な第１挟持面６１とを、上面側（第１オリフィス形成部材１７の軸芯方向Ｇにおける一方面側に相当）に備える。また、第１挟持部４の下面側（他方面側に相当）は、径方向内方Ｋ１ほど上方に（即ち、前記一方面側に近づくように）傾斜した傾斜面部６３に形成されている。   The first clamping portion 4 protrudes from the inner peripheral portion 17N of the first orifice forming member 17 toward the radially inner side K1, that is, is formed on the inner peripheral portion 17N so as to protrude. As shown in FIG. 2, the first sandwiching portion 4 has a longitudinal cross-sectional arc shape that tightly fits (closely fits) the lower half 41 </ b> S of the bulging portion 41 (corresponding to the bulging portion on one film surface side). One fitting recess 51 and a flat first clamping surface 61 with respect to the flat first clamping surface 45M1 of the elastic partition membrane portion 45 on the radially inner side thereof are arranged on the upper surface side (in the axial direction of the first orifice forming member 17). Corresponding to one side of G). Further, the lower surface side (corresponding to the other surface side) of the first sandwiching portion 4 is formed as an inclined surface portion 63 that is inclined upward (ie, closer to the one surface side) toward the radially inner side K1.

第２オリフィス形成部材１８には、第１液室１１Ａを防振基体３側の主室１１Ａ１と弾性仕切り膜１５側の副室１１Ａ２とに上下に仕切る仕切り部１０が設けられ、仕切り部１０の径方向中央部に主室１１Ａ１と副室１１Ａ２を連通させる第２のオリフィス２９が形成されている。詳細には、成形性及び性能上の点から、第２オリフィス形成部材１８は、第１オリフィス形成部材１７に内嵌する外側筒部４７と、該外側筒部４７の下端内周部から径方向内方Ｋ１に向けて突設された第２挟持部５と、該第２挟持部５から径方向内方Ｋ１に延設された仕切り部１０とを一体に備えて形成されている。そして、仕切り部１０が、外側筒部４７によって同芯状に取り囲まれる短円筒状の内側筒部５５と、第２挟持部５の内周端から上方（防振基体３側）に延設され更にその上端から径方向内方Ｋ１に延設されて内側筒部５５の下端に連結される連結部４９とからなり、内側筒部５５の中空部がオリフィス形成体１６の軸芯方向Ｇに開口する第２のオリフィス２９に構成されている。 The second orifice forming member 18 is provided with a partition portion 10 that vertically partitions the first liquid chamber 11A into a main chamber 11A1 on the vibration isolation base 3 side and a sub chamber 11A2 on the elastic partition membrane 15 side. A second orifice 29 for communicating the main chamber 11A1 and the sub chamber 11A2 is formed in the central portion in the radial direction. More specifically, from the viewpoint of formability and performance, the second orifice forming member 18 is formed of an outer cylindrical portion 47 fitted into the first orifice forming member 17 and a radial direction from the inner peripheral portion of the lower end of the outer cylindrical portion 47. The second holding part 5 projecting toward the inner side K1 and the partition part 10 extending from the second holding part 5 in the radial inner direction K1 are integrally provided. The partition portion 10 is extended upward (from the antivibration base 3 side) from the short cylindrical inner tube portion 55 concentrically surrounded by the outer tube portion 47 and the inner peripheral end of the second sandwiching portion 5. Furthermore, it comprises a connecting portion 49 extending radially inwardly from the upper end K1 and connected to the lower end of the inner cylindrical portion 55, and the hollow portion of the inner cylindrical portion 55 opens in the axial direction G of the orifice forming body 16. The second orifice 29 is configured.

第２挟持部５は、膨出部４１の上半分４１Ｕ（他方の膜面側の膨出部分に相当）をきつく嵌合（密嵌）させる縦断面円弧状の第２嵌合凹部５２と、その径方向内側において弾性仕切り膜部分４５の扁平な第２被挟持面４５Ｍ２に対する扁平な第２挟持面６２とを、下面側（第２オリフィス形成部材１８の軸芯方向Ｇにおける一方面側に相当）に備える。また、第２挟持部５の上面側（他方面側に相当）には、周方向に一定の間隔で複数のリブ９７が設けられている。リブ９７は、図３，４に示すように、周方向の４箇所に等間隔に配され、外側筒部４７から連結部４９にわたらせて、即ち外側筒部４７の内周面と連結部４９の外周面とを連結するように設けられている。そして、このようにリブ９７を設けることで、リブ９７間には周方向に延びる円弧状の凹溝部９８が設けられ、第２オリフィス形成部材１８の成型後における樹脂のひけを防止している。   The second sandwiching portion 5 includes a second fitting recess 52 having an arcuate cross section for tightly fitting (tightly fitting) the upper half 41U (corresponding to the bulging portion on the other film surface side) of the bulging portion 41; The flat second clamping surface 62 with respect to the flat second clamping surface 45M2 of the elastic partition membrane portion 45 on the radially inner side corresponds to the lower surface side (corresponding to one surface side in the axial direction G of the second orifice forming member 18). ) A plurality of ribs 97 are provided on the upper surface side (corresponding to the other surface side) of the second sandwiching portion 5 at regular intervals in the circumferential direction. As shown in FIGS. 3 and 4, the ribs 97 are equally spaced at four locations in the circumferential direction and extend from the outer cylindrical portion 47 to the connecting portion 49, that is, the inner peripheral surface of the outer cylindrical portion 47 and the connecting portion 49. It is provided so that it may connect with the outer peripheral surface. By providing the ribs 97 in this manner, arc-shaped concave grooves 98 extending in the circumferential direction are provided between the ribs 97 to prevent resin sink after molding of the second orifice forming member 18.

そして、上記第１挟持面６１と弾性仕切り膜部分４５の第１被挟持面４５Ｍ１との間、及び、第２挟持面６２と弾性仕切り膜部分４５の第２被挟持面４５Ｍ２との間に、振動入力時（低周波数から高周波数にわたる振動の入力時）にも隙間が形成されないように、弾性仕切り膜部分４５が第１挟持部４と第２挟持部５との間で厚み方向に圧縮状態に挟持されている（図５参照、二点鎖線は上側に変位した弾性仕切り膜１５を示す。弾性仕切り膜１５は振動の入力に伴って、図５の実線の状態から下側にも変位するが、下側に変位した弾性仕切り膜１５は示していない）。   And between the first sandwiching surface 61 and the first sandwiched surface 45M1 of the elastic partition membrane portion 45, and between the second sandwiching surface 62 and the second sandwiched surface 45M2 of the elastic partition membrane portion 45, The elastic partition membrane portion 45 is compressed in the thickness direction between the first sandwiching portion 4 and the second sandwiching portion 5 so that no gap is formed even when vibration is input (when vibration ranging from low frequency to high frequency is input). (Refer to FIG. 5, the two-dot chain line indicates the elastic partition film 15 displaced upward. The elastic partition film 15 is also displaced downward from the solid line state of FIG. 5 in response to the input of vibration. However, the elastic partition film 15 displaced downward is not shown).

このような予圧縮の比率は、特に限定されないが、（挟持前の弾性仕切り膜部分４５の肉厚−挟持状態の弾性仕切り膜部分４５の肉厚）／（挟持前の弾性仕切り膜部分４５の肉厚）が０．０５〜０．１５、より好ましくは０．１〜０．１５に設定してあることが好ましい。これにより、振動入力に伴って、第１被挟持面４５Ｍ１と第１挟持面６１とが衝突するのを回避できるとともに、第２被挟持面４５Ｍ２と第２挟持面６２とが衝突するのを回避できて、異音を生じにくくすることができる。   The ratio of such pre-compression is not particularly limited, but (thickness of elastic partition membrane portion 45 before clamping−thickness of elastic partition membrane portion 45 in sandwiched state) / (thickness of elastic partition membrane portion 45 before sandwiching) The thickness is preferably set to 0.05 to 0.15, more preferably 0.1 to 0.15. Thereby, it is possible to avoid the collision between the first sandwiched surface 45M1 and the first sandwiching surface 61 with the vibration input, and to avoid the collision between the second sandwiched surface 45M2 and the second sandwiching surface 62. It can be made difficult to generate abnormal noise.

第２オリフィス形成部材１８は第１オリフィス形成部材１７に第１オリフィス形成部材１７の軸芯方向の一端部１７Ａ側から内嵌し、第２オリフィス形成部材１８の軸芯方向の一端部１８Ａ側に張り出し形成されたフランジ３８が、第１オリフィス形成部材１７の軸芯方向の一端部１７Ａ側に形成された環状の凹部３９に、オリフィス形成体１６の軸芯方向Ｇで受け止められている。前記第２挟持部５は、第２オリフィス形成部材１８の軸芯方向の他端部１８Ｂに形成されており、第１挟持部４は、オリフィス形成体１６の軸芯方向Ｇにおいて第２挟持部５に相対するように形成されている。   The second orifice forming member 18 is fitted into the first orifice forming member 17 from the one end portion 17A side in the axial direction of the first orifice forming member 17, and on the one end portion 18A side in the axial direction of the second orifice forming member 18. An overhang-formed flange 38 is received in the axial direction G of the orifice forming body 16 by an annular recess 39 formed on the one end 17 </ b> A side in the axial direction of the first orifice forming member 17. The second clamping part 5 is formed at the other end 18B in the axial direction of the second orifice forming member 18, and the first clamping part 4 is the second clamping part in the axial direction G of the orifice forming body 16. 5 is formed so as to be opposed to 5.

第１オリフィス形成部材１７と第２オリフィス形成部材１８からなる前記オリフィス形成体１６は、取付け板１３（図１参照）と、防振基体３に形成された受け部３３とにより前記オリフィス形成体１６の軸芯方向Ｇで挟持固定されている。図１、図６に示すように受け部３３は、第１オリフィス形成部材１７の軸芯方向の一端部１７Ａ側の端面１７Ｍに圧接する円環状の外側受け部分３１と、前記端面１７Ｍ及び前記フランジ３８に圧接する内側受け部分３２とからなる。内側受け部分３２は、第２取付け金具２の周方向Ｓに一定間隔で並ぶ複数の受け止め突部３２Ａを、外側受け部分３１から径方向内方Ｋ１側に突出させて構成されている。フランジ３８のフランジ面（フランジ３８の一対の面のうち上側の面）と、第１オリフィス形成部材１７の軸芯方向の一端部１７Ａ側の端面１７Ｍとはオリフィス形成体１６の軸芯方向Ｇで同一位置に位置している（面一になっている）。   The orifice forming body 16 composed of the first orifice forming member 17 and the second orifice forming member 18 includes the mounting plate 13 (see FIG. 1) and the orifice forming body 16 by a receiving portion 33 formed on the vibration isolating base 3. Are clamped and fixed in the axial direction G. As shown in FIGS. 1 and 6, the receiving portion 33 includes an annular outer receiving portion 31 that is in pressure contact with the end surface 17M on the one end portion 17A side in the axial direction of the first orifice forming member 17, and the end surface 17M and the flange. And an inner receiving portion 32 that press-contacts to 38. The inner receiving portion 32 is configured by projecting a plurality of receiving protrusions 32A arranged at regular intervals in the circumferential direction S of the second mounting bracket 2 from the outer receiving portion 31 toward the radially inward K1 side. The flange surface of the flange 38 (the upper surface of the pair of surfaces of the flange 38) and the end surface 17M on the one end 17A side in the axial direction of the first orifice forming member 17 are in the axial direction G of the orifice forming body 16. It is located at the same position (it is flush).

以上よりなる防振装置１００では、大振幅の振動が入力すると、液体が第１のオリフィス２５を通って第１液室１１Ａと第２液室１１Ｂ間を流動し、かかる液体の流動効果によって振動を減衰させる。そして、例えば１００Ｈｚ前後の高周波数の微振幅振動が入力すると、弾性仕切り膜１５が往復動変形することで、第１液室１１Ａ内の液圧を吸収して動バネ定数を低減し、こもり音を低減することができる。特に、本実施形態であると、第２のオリフィス２９における液体の流動作用により、上記高周波数の振動入力に対して動バネ定数を一層低減することができる。   In the vibration isolator 100 configured as described above, when a large amplitude vibration is input, the liquid flows between the first liquid chamber 11A and the second liquid chamber 11B through the first orifice 25, and vibrates due to the flow effect of the liquid. Is attenuated. For example, when a high-frequency minute amplitude vibration of about 100 Hz is input, the elastic partition film 15 is reciprocally deformed, thereby absorbing the hydraulic pressure in the first liquid chamber 11A and reducing the dynamic spring constant, thereby Can be reduced. In particular, in the present embodiment, the dynamic spring constant can be further reduced with respect to the high-frequency vibration input by the fluid flow action of the second orifice 29.

しかも、本実施形態では、弾性仕切り膜１５を上記の如くオリフィス形成体１６で挟持固定したことから、弾性仕切り膜１５の有効径を大きくすることができ、ここでは、図１に示すように、弾性仕切り膜１５の有効径Ｄ１が第１取付け金具１の有効ピストン径Ｄ２に対して同等以上に設定されている。これにより、第２のオリフィス２９に液体を流動させやすくして、高周波数の振動に対する防振効果を高めることができる。詳細には、図１３に示す弾性仕切り膜１５の外周部がオリフィス形成体１６の内周部から突出するフランジに加硫接着されてなる比較例の液封入式防振装置と比較した場合、図１２に示すように、本実施形態のものでは、１００Ｈｚ付近での振動入力に対する動ばね定数Ｋｄが低減され、高周波数域の振動の防振効果に優れる。   Moreover, in this embodiment, since the elastic partition membrane 15 is sandwiched and fixed by the orifice forming body 16 as described above, the effective diameter of the elastic partition membrane 15 can be increased. Here, as shown in FIG. The effective diameter D1 of the elastic partition membrane 15 is set to be equal to or greater than the effective piston diameter D2 of the first mounting bracket 1. As a result, the liquid can easily flow through the second orifice 29, and the anti-vibration effect against high-frequency vibration can be enhanced. Specifically, when compared with a liquid filled type vibration damping device of a comparative example in which the outer peripheral portion of the elastic partition film 15 shown in FIG. 13 is vulcanized and bonded to a flange protruding from the inner peripheral portion of the orifice forming body 16, As shown in FIG. 12, in the present embodiment, the dynamic spring constant Kd with respect to the vibration input in the vicinity of 100 Hz is reduced, and the anti-vibration effect of vibration in the high frequency range is excellent.

また、本実施形態では、上記弾性仕切り膜部分４５に予圧縮を付与したことにより、振動入力時の弾性仕切り膜部分４５とその上下の第１挟持面６１及び第２挟持面６２との衝突を回避して、異音を生じにくくすることができる。特に、第１挟持部４に上記傾斜面６３を設けるとともに、第２挟持部５に上記リブ９７を設けたことにより、弾性仕切り膜部分４５に対して高い押圧力を付与することができて、弾性仕切り膜部分４５を所望の圧縮状態に安定して挟持することができ、上記衝突をより効果的に回避することができる。   Further, in the present embodiment, by applying pre-compression to the elastic partition membrane portion 45, collision between the elastic partition membrane portion 45 and the upper and lower first clamping surfaces 61 and second clamping surfaces 62 during vibration input is prevented. By avoiding this, it is possible to make it difficult for abnormal noise to occur. In particular, by providing the inclined surface 63 in the first sandwiching portion 4 and providing the rib 97 in the second sandwiching portion 5, a high pressing force can be applied to the elastic partition membrane portion 45, The elastic partition membrane portion 45 can be stably held in a desired compressed state, and the collision can be more effectively avoided.

また、上記第２のオリフィス２９を樹脂製の第２オリフィス形成部材１８に一体に成形したことにより、図１３のような別体の金属製部材１１２で第２のオリフィス２９を形成するものに比べて、軽量化が図られるとともに、防振装置の組み立ても容易となり、また組み立て精度にも優れる。   Further, by forming the second orifice 29 integrally with the resin-made second orifice forming member 18, compared to the case where the second orifice 29 is formed by a separate metal member 112 as shown in FIG. 13. Thus, the weight can be reduced, the vibration isolator can be easily assembled, and the assembly accuracy is excellent.

［第２実施形態］
図７，８は、第２実施形態に係る防振装置の要部を拡大して示したものであり、第２実施形態は、弾性仕切り膜１５の膨出部４１における外周縁に径方向外方Ｋ２に突出するシール突条７０を設けた点を特徴とする。該シール突条７０は、弾性仕切り膜１５の全周にわたって形成されており、図８に示すように、第１オリフィス形成部材１７と第２オリフィス形成部材１８の扁平な接合面間で圧縮状態に挟持されている。これにより、弾性仕切り膜１５の外周部における液体のシール性が向上されている。その他の構成は、第１実施形態と同一の構成を採用することができる。 [Second Embodiment]
7 and 8 are enlarged views of the main part of the vibration isolator according to the second embodiment. In the second embodiment, the outer peripheral edge of the bulging portion 41 of the elastic partition film 15 is radially outward. A feature is that a seal protrusion 70 protruding in the direction K2 is provided. The seal protrusion 70 is formed over the entire circumference of the elastic partition film 15, and is compressed between the flat joint surfaces of the first orifice forming member 17 and the second orifice forming member 18, as shown in FIG. It is pinched. Thereby, the sealing performance of the liquid in the outer peripheral part of the elastic partition film 15 is improved. Other configurations can employ the same configurations as those of the first embodiment.

［第３実施形態］
次に、図９〜１１に基づいて第３実施形態に係る防振装置１１０について説明する。第３実施形態は、上記弾性仕切り膜部分４５の第１被挟持面４５Ｍ１と第２被挟持面４５Ｍ２にそれぞれ圧縮用凸部７２を設けた点を特徴とする。圧縮用凸部７２は、弾性仕切り膜部分４５の上下両面からなだらかな縦断面山形状に膨出して形成されており、弾性仕切り膜１５の全周にわたって環状に形成されている。圧縮用凸部７２は、上記弾性仕切り膜部分４５での予圧縮を確実にして、振動入力時における第１挟持面６１及び第２挟持面６２との間での隙間の発生を更に抑制するために設けられており、第１挟持部４と第２挟持部５との挟持により圧縮されている。なお、該圧縮用凸部７２を押圧する第１挟持面６１と第２挟持面６２は、第１実施形態と同様に扁平でもよく、また密着性を高めるために対応する凹部７４を設けてもよく、凹部７４を設ける場合、弾性仕切り膜部分４５での厚み方向での圧縮を確実にするため、圧縮用凸部７２の外形形状よりも扁平に近い凹状に形成されることが好ましい。 [Third Embodiment]
Next, the vibration isolator 110 according to the third embodiment will be described with reference to FIGS. The third embodiment is characterized in that compression convex portions 72 are provided on the first sandwiched surface 45M1 and the second sandwiched surface 45M2 of the elastic partition membrane portion 45, respectively. The compression convex portion 72 is formed so as to bulge from the upper and lower surfaces of the elastic partition membrane portion 45 into a gentle mountain-shaped cross section, and is formed in an annular shape over the entire circumference of the elastic partition membrane 15. The compression convex portion 72 ensures pre-compression at the elastic partition membrane portion 45 and further suppresses the generation of a gap between the first clamping surface 61 and the second clamping surface 62 at the time of vibration input. And is compressed by clamping between the first clamping unit 4 and the second clamping unit 5. In addition, the 1st clamping surface 61 and the 2nd clamping surface 62 which press this this convex part 72 for compression may be flat like 1st Embodiment, and even if it provides the corresponding recessed part 74 in order to improve adhesiveness. When the recess 74 is provided, it is preferable that the elastic partition film portion 45 is formed in a concave shape closer to the flat shape than the outer shape of the compression convex portion 72 in order to ensure compression in the thickness direction.

上記圧縮用凸部７２は、図１０に示すように、第１挟持部４及び第２挟持部５の内周縁４Ｎ，５Ｎを越えて径方向内方Ｋ１側に延在している。すなわち、圧縮用凸部７２の内周縁７２Ｎが第１挟持部４及び第２挟持部５の内周縁４Ｎ，５Ｎよりも径方向内方Ｋ１に位置しており、これにより、該内周縁４Ｎ，５Ｎでの弾性仕切り膜１５の肉厚Ｔ１が弾性仕切り膜１５の一般部での肉厚Ｔ０よりも厚肉に形成されている。これにより、他の部分に比べて亀裂が入りやすい内周縁４Ｎ，５Ｎでの弾性仕切り膜１５の亀裂発生が抑制されている。   As shown in FIG. 10, the compression convex portion 72 extends toward the radially inner side K <b> 1 beyond the inner peripheral edges 4 </ b> N and 5 </ b> N of the first sandwiching portion 4 and the second sandwiching portion 5. That is, the inner peripheral edge 72N of the compression convex portion 72 is located in the radially inward K1 with respect to the inner peripheral edges 4N and 5N of the first sandwiching section 4 and the second sandwiching section 5, and thereby the inner peripheral edges 4N, The thickness T1 of the elastic partition film 15 at 5N is formed to be thicker than the thickness T0 in the general part of the elastic partition film 15. Thereby, the crack generation | occurrence | production of the elastic partition film | membrane 15 in the inner periphery 4N and 5N which is easy to be cracked compared with another part is suppressed.

その他の構成は、第１実施形態と同一であり、同一箇所には同一符号を付して説明を省略する。   Other configurations are the same as those of the first embodiment, and the same portions are denoted by the same reference numerals and description thereof is omitted.

本発明は、自動車のエンジンマウントを始めとする各種の車両用の防振装置として好適に利用することができる。   INDUSTRIAL APPLICABILITY The present invention can be suitably used as a vibration isolator for various vehicles including an automobile engine mount.

第１実施形態に係る液封入式防振装置の縦断面図1 is a longitudinal sectional view of a liquid-filled vibration isolator according to a first embodiment. 同防振装置の仕切り体の縦断面図（図４のII−II線断面図）Vertical sectional view of the partition of the vibration isolator (sectional view taken along line II-II in FIG. 4) 同仕切り体の分解縦断面図Exploded longitudinal sectional view of the partition 同仕切り体の平面図Top view of the partition 同仕切り体の弾性仕切り膜の作動を示す縦断面図Longitudinal sectional view showing the operation of the elastic partition membrane of the partition 図１のVI−VI線断面図Sectional view along line VI-VI in Fig. 1 第２実施形態の仕切り体の要部拡大分解縦断面図The principal part expansion disassembled longitudinal cross-sectional view of the partition body of 2nd Embodiment 第２実施形態の仕切り体の要部拡大縦断面図The principal part expansion longitudinal cross-sectional view of the partition body of 2nd Embodiment 第３実施形態の液封入式防振装置の縦断面図Longitudinal sectional view of the liquid filled type vibration damping device of the third embodiment 第３実施形態の仕切り体の縦断面図The longitudinal cross-sectional view of the partition body of 3rd Embodiment 第３実施形態の仕切り体の分解縦断面図Exploded longitudinal sectional view of the partition body of the third embodiment 第１実施形態の液封入式防振装置の作用を示す図The figure which shows the effect | action of the liquid enclosure type vibration isolator of 1st Embodiment. 比較例の液封入式防振装置の縦断面図Longitudinal sectional view of the liquid filled type vibration isolator of the comparative example

符号の説明Explanation of symbols

１…第１取付け金具（第１取付け具）、２…第２取付け金具（第２取付け具）、２Ｎ…第２取付け金具の内周部、３…防振基体、４…第１挟持部、４Ｎ…第１挟持部の内周縁、５…第２挟持部、５Ｎ…第２挟持部の内周縁、８…液体封入室、９…ダイヤフラム、９Ｇ…ダイヤフラムの外周部、１０…仕切り部、１１Ａ…第１液室、１１Ａ１…主室、１１Ａ２…副室、１１Ｂ…第２液室、１２…仕切り体、１３…取付け板、１３Ｎ…取付け板の内周部、１３Ｇ…取付け板の外周部、１５…弾性仕切り膜、１５Ｍ１…一方の膜面、１５Ｍ２…他方の膜面、１６…オリフィス形成体、１６Ｎ…オリフィス形成体の内周部、１６Ｍ…オリフィス形成体の内周面、１７…第１オリフィス形成部材、１７Ｇ…第１オリフィス形成部材の外周部、１７Ａ…第１オリフィス形成部材の軸芯方向の一端部、１７Ｎ…第１オリフィス形成部材の内周部、１７Ｍ…第１オリフィス形成部材の軸芯方向の一端部側の端面、１８…第２オリフィス形成部材、１８Ａ…第２オリフィス形成部材の軸芯方向の一端部、１８Ｂ…第２オリフィス形成部材の軸芯方向の他端部、２５…第１のオリフィス、２５Ｇ…オリフィス溝、２８…第２取付け金具の周壁部、２９…第２のオリフィス、３１…外側受け部分、３２…内側受け部分、３２Ａ…受け止め突部、３３…受け部、３８…フランジ、３９…凹部、４１…膨出部、４１Ｓ…膨出部の下半分（一方の膜面側の膨出部分）、４１Ｕ…膨出部の上半分（他方の膜面側の膨出部分）、４５…弾性仕切り膜部分、４５Ｍ１…第１被挟持面、４５Ｍ２…第２被挟持面、４６…被挟持部、４７…外側筒部、４９…連結部、５１…第１嵌合凹部、５２…第２嵌合凹部、５５…内側筒部、６１…第１挟持面、６２…第２挟持面、６３…傾斜面部、７０…シール突条、７２…圧縮用凸部、９７…リブ、１００，１１０…液封入式防振装置、Ｇ…オリフィス形成体の軸芯方向、Ｋ１…径方向内方、Ｐ１…一方の膜面の外方側、Ｐ２…他方の膜面の外方側、Ｓ…第２取付け金具の周方向 DESCRIPTION OF SYMBOLS 1 ... 1st attachment bracket (1st attachment), 2 ... 2nd attachment bracket (2nd attachment), 2N ... Inner peripheral part of 2nd attachment bracket, 3 ... Anti-vibration base | substrate, 4 ... 1st clamping part, 4N: inner peripheral edge of the first clamping part, 5 ... second clamping part, 5N: inner peripheral edge of the second clamping part, 8 ... liquid sealing chamber, 9 ... diaphragm, 9G ... outer peripheral part of diaphragm, 10 ... partition part, 11A ... 1st liquid chamber, 11A1 ... Main chamber, 11A2 ... Sub chamber, 11B ... 2nd liquid chamber, 12 ... Partition body, 13 ... Mounting plate, 13N ... Inner peripheral part of mounting plate, 13G ... Outer peripheral part of mounting plate, DESCRIPTION OF SYMBOLS 15 ... Elastic partition membrane, 15M1 ... One membrane surface, 15M2 ... The other membrane surface, 16 ... Orifice formation body, 16N ... Inner peripheral part of an orifice formation body, 16M ... Inner peripheral surface of an orifice formation body, 17 ... 1st Orifice forming member, 17G ... outer periphery of first orifice forming member, 17A ... first One end portion of the orifice forming member in the axial direction, 17N... Inner peripheral portion of the first orifice forming member, 17M... End surface of one end portion in the axial direction of the first orifice forming member, 18. ... one end of the second orifice forming member in the axial direction, 18B ... the other end in the axial direction of the second orifice forming member, 25 ... the first orifice, 25G ... the orifice groove, 28 ... the peripheral wall of the second mounting bracket 29, second orifice, 31 ... outer receiving portion, 32 ... inner receiving portion, 32A ... receiving protrusion, 33 ... receiving portion, 38 ... flange, 39 ... recessed portion, 41 ... bulging portion, 41S ... bulging Lower half (bulge portion on one film surface side), 41U ... upper half of the bulge portion (bulge portion on the other film surface side), 45 ... elastic partition membrane portion, 45M1 ... first sandwiched surface 45M2 ... second sandwiched surface, 46 ... covered Holding part, 47 ... outer cylinder part, 49 ... connecting part, 51 ... first fitting recess, 52 ... second fitting recess, 55 ... inner cylinder part, 61 ... first clamping surface, 62 ... second clamping surface, 63 ... inclined surface part, 70 ... seal protrusion, 72 ... convex part for compression, 97 ... rib, 100, 110 ... liquid-filled vibration isolator, G ... axial direction of the orifice forming body, K1 ... radially inward, P1 ... the outer side of one film surface, P2 ... the outer side of the other film surface, S ... the circumferential direction of the second mounting bracket

Claims (7)

第１取付け具と、
筒状の第２取付け具と、
前記第１取付け具と第２取付け具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ゴム膜からなるダイヤフラムと、
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液室を連通させる第１のオリフィスとを備え、
前記仕切り体は、前記第２取付け具の周壁部との間に前記第１のオリフィスが形成される環状のオリフィス形成体と、前記オリフィス形成体の内周部に外周部が保持されて前記オリフィス形成体の内周面の間を塞ぐ弾性仕切り膜とからなり、
前記オリフィス形成体は、前記第１のオリフィスを形成するためのオリフィス溝を外周部に備えた環状の第１オリフィス形成部材と、前記第１オリフィス形成部材に内嵌された環状の第２オリフィス形成部材とで構成され、前記第１オリフィス形成部材と第２オリフィス形成部材に第１挟持部と第２挟持部が各別に設けられて、前記第１挟持部と第２挟持部とにより前記弾性仕切り膜の外周部が前記オリフィス形成体の軸芯方向で挟持されており、
前記第１液室を前記防振基体側の主室と前記弾性仕切り膜側の副室とに仕切る仕切り部が前記第２オリフィス形成部材に一体に設けられ、前記仕切り部に前記主室と副室を連通させる第２のオリフィスが形成され、
前記弾性仕切り膜の外周部が一方の膜面の外方側と他方の膜面の外方側に膨出した膨出部に形成され、前記第１挟持部と第２挟持部が、前記弾性仕切り膜の径方向で前記膨出部よりも内方側の弾性仕切り膜部分と前記膨出部とからなる被挟持部を前記オリフィス形成体の軸芯方向で挟持するものであり、
前記弾性仕切り膜部分の第１被挟持面と、前記第１被挟持面に対する前記第１挟持部の第１挟持面との間、及び、前記弾性仕切り膜部分の第２被挟持面と、前記第２被挟持面に対する前記第２挟持部の第２挟持面との間に、振動入力時にも隙間が形成されないように、前記弾性仕切り膜部分が前記第１挟持部と第２挟持部とにより圧縮状態に挟持され、
前記第１挟持部が前記第１オリフィス形成部材の内周部から径方向内方に向けて突設されており、前記第１挟持部は、前記第１オリフィス形成部材の軸芯方向における一方面側に前記第１挟持面を備えるとともに、他方面側が径方向内方ほど前記一方面側に近づくように傾斜した傾斜面部に形成されている
液封入式防振装置。 A first fixture;
A cylindrical second fixture;
An anti-vibration base made of a rubber-like elastic body that connects the first fixture and the second fixture;
A diaphragm made of a rubber film that is attached to the second fixture and forms a liquid sealing chamber between the anti-vibration base;
A partition that divides the liquid sealing chamber into a first liquid chamber on the vibration-proof base side and a second liquid chamber on the diaphragm side;
A first orifice for communicating the first liquid chamber and the second liquid chamber;
The partition body includes an annular orifice forming body in which the first orifice is formed between a peripheral wall portion of the second fixture, and an outer peripheral portion held by an inner peripheral portion of the orifice forming body. It consists of an elastic partition membrane that blocks between the inner peripheral surfaces of the formed body,
The orifice forming body includes an annular first orifice forming member provided with an orifice groove for forming the first orifice on an outer peripheral portion, and an annular second orifice forming member fitted in the first orifice forming member. Each of the first orifice forming member and the second orifice forming member is provided with a first sandwiching portion and a second sandwiching portion, respectively, and the elastic partition is formed by the first sandwiching portion and the second sandwiching portion. The outer periphery of the membrane is sandwiched in the axial direction of the orifice forming body,
A partition portion that divides the first liquid chamber into a main chamber on the vibration isolation base side and a sub chamber on the elastic partition membrane side is provided integrally with the second orifice forming member, and the main chamber and the sub chamber are provided in the partition portion. A second orifice is formed for communicating the chambers ;
An outer peripheral portion of the elastic partition membrane is formed in a bulging portion that bulges to the outer side of one membrane surface and the outer side of the other membrane surface, and the first clamping portion and the second clamping portion are said elastic A sandwiched portion composed of an elastic partition membrane portion on the inner side of the bulging portion and the bulging portion in the radial direction of the partition membrane is sandwiched in the axial direction of the orifice forming body,
Between the first sandwiched surface of the elastic partition membrane portion and the first sandwiched surface of the first sandwiching portion with respect to the first sandwiched surface; and the second sandwiched surface of the elastic partition membrane portion; The elastic partition film portion is formed between the first sandwiching portion and the second sandwiching portion so that a gap is not formed between the second sandwiching surface of the second sandwiching portion and the second sandwiching surface with respect to the second sandwiched surface even during vibration input. Sandwiched in a compressed state,
The first sandwiching portion protrudes radially inward from the inner peripheral portion of the first orifice forming member, and the first sandwiching portion is one surface in the axial direction of the first orifice forming member. A liquid-filled vibration isolator having the first clamping surface on the side and formed on an inclined surface portion that is inclined so that the other surface side is closer to the one surface side inward in the radial direction . 第１取付け具と、
筒状の第２取付け具と、
前記第１取付け具と第２取付け具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ゴム膜からなるダイヤフラムと、
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液室を連通させる第１のオリフィスとを備え、
前記仕切り体は、前記第２取付け具の周壁部との間に前記第１のオリフィスが形成される環状のオリフィス形成体と、前記オリフィス形成体の内周部に外周部が保持されて前記オリフィス形成体の内周面の間を塞ぐ弾性仕切り膜とからなり、
前記オリフィス形成体は、前記第１のオリフィスを形成するためのオリフィス溝を外周部に備えた環状の第１オリフィス形成部材と、前記第１オリフィス形成部材に内嵌された環状の第２オリフィス形成部材とで構成され、前記第１オリフィス形成部材と第２オリフィス形成部材に第１挟持部と第２挟持部が各別に設けられて、前記第１挟持部と第２挟持部とにより前記弾性仕切り膜の外周部が前記オリフィス形成体の軸芯方向で挟持されており、
前記第１液室を前記防振基体側の主室と前記弾性仕切り膜側の副室とに仕切る仕切り部が前記第２オリフィス形成部材に一体に設けられ、前記仕切り部に前記主室と副室を連通させる第２のオリフィスが形成され、
前記弾性仕切り膜の外周部が一方の膜面の外方側と他方の膜面の外方側に膨出した膨出部に形成され、前記第１挟持部と第２挟持部が、前記弾性仕切り膜の径方向で前記膨出部よりも内方側の弾性仕切り膜部分と前記膨出部とからなる被挟持部を前記オリフィス形成体の軸芯方向で挟持するものであり、
前記弾性仕切り膜部分の第１被挟持面と、前記第１被挟持面に対する前記第１挟持部の第１挟持面との間、及び、前記弾性仕切り膜部分の第２被挟持面と、前記第２被挟持面に対する前記第２挟持部の第２挟持面との間に、振動入力時にも隙間が形成されないように、前記弾性仕切り膜部分が前記第１挟持部と第２挟持部とにより圧縮状態に挟持され、
前記第２オリフィス形成部材は、前記第１オリフィス形成部材に内嵌する外側筒部と、前記外側筒部から径方向内方に向けて突設された前記第２挟持部と、前記第２挟持部から径方向内方に延設された前記仕切り部とからなり、
前記仕切り部が、前記外側筒部によって取り囲まれる内側筒部と、前記内側筒部と前記第２挟持部を連結する連結部とからなり、前記内側筒部の中空部が前記オリフィス形成体の軸芯方向に開口する前記第２のオリフィスを構成しており、
前記第２挟持部は、前記第２オリフィス形成部材の軸芯方向における一方面側に前記第２挟持面を備えるとともに、他方面側には周方向に複数のリブが前記外側筒部から前記連結部にわたらせて設けられた
液封入式防振装置。 A first fixture;
A cylindrical second fixture;
An anti-vibration base made of a rubber-like elastic body that connects the first fixture and the second fixture;
A diaphragm made of a rubber film that is attached to the second fixture and forms a liquid sealing chamber between the anti-vibration base;
A partition that divides the liquid sealing chamber into a first liquid chamber on the vibration-proof base side and a second liquid chamber on the diaphragm side;
A first orifice for communicating the first liquid chamber and the second liquid chamber;
The partition body includes an annular orifice forming body in which the first orifice is formed between a peripheral wall portion of the second fixture, and an outer peripheral portion held by an inner peripheral portion of the orifice forming body. It consists of an elastic partition membrane that blocks between the inner peripheral surfaces of the formed body,
The orifice forming body includes an annular first orifice forming member provided with an orifice groove for forming the first orifice on an outer peripheral portion, and an annular second orifice forming member fitted in the first orifice forming member. Each of the first orifice forming member and the second orifice forming member is provided with a first sandwiching portion and a second sandwiching portion, respectively, and the elastic partition is formed by the first sandwiching portion and the second sandwiching portion. The outer periphery of the membrane is sandwiched in the axial direction of the orifice forming body,
A partition portion that divides the first liquid chamber into a main chamber on the vibration isolation base side and a sub chamber on the elastic partition membrane side is provided integrally with the second orifice forming member, and the main chamber and the sub chamber are provided in the partition portion. A second orifice is formed for communicating the chambers ;
An outer peripheral portion of the elastic partition membrane is formed in a bulging portion that bulges to the outer side of one membrane surface and the outer side of the other membrane surface, and the first clamping portion and the second clamping portion are said elastic A sandwiched portion composed of an elastic partition membrane portion on the inner side of the bulging portion and the bulging portion in the radial direction of the partition membrane is sandwiched in the axial direction of the orifice forming body,
Between the first sandwiched surface of the elastic partition membrane portion and the first sandwiched surface of the first sandwiching portion with respect to the first sandwiched surface; and the second sandwiched surface of the elastic partition membrane portion; The elastic partition film portion is formed between the first sandwiching portion and the second sandwiching portion so that a gap is not formed between the second sandwiching surface of the second sandwiching portion and the second sandwiching surface with respect to the second sandwiched surface even during vibration input. Sandwiched in a compressed state,
The second orifice forming member includes an outer cylindrical portion fitted into the first orifice forming member, the second holding portion projecting radially inward from the outer cylindrical portion, and the second holding portion. The partition part extending radially inward from the part,
The partition part includes an inner cylinder part surrounded by the outer cylinder part, and a connecting part that connects the inner cylinder part and the second clamping part, and the hollow part of the inner cylinder part is a shaft of the orifice forming body. Constituting the second orifice opening in the core direction;
The second clamping portion includes the second clamping surface on one surface side in the axial direction of the second orifice forming member, and a plurality of ribs in the circumferential direction on the other surface side from the outer tube portion. Liquid-filled vibration isolator provided across the section . 第１取付け具と、
筒状の第２取付け具と、
前記第１取付け具と第２取付け具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ゴム膜からなるダイヤフラムと、
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液室を連通させる第１のオリフィスとを備え、
前記仕切り体は、前記第２取付け具の周壁部との間に前記第１のオリフィスが形成される環状のオリフィス形成体と、前記オリフィス形成体の内周部に外周部が保持されて前記オリフィス形成体の内周面の間を塞ぐ弾性仕切り膜とからなり、
前記オリフィス形成体は、前記第１のオリフィスを形成するためのオリフィス溝を外周部に備えた環状の第１オリフィス形成部材と、前記第１オリフィス形成部材に内嵌された環状の第２オリフィス形成部材とで構成され、前記第１オリフィス形成部材と第２オリフィス形成部材に第１挟持部と第２挟持部が各別に設けられて、前記第１挟持部と第２挟持部とにより前記弾性仕切り膜の外周部が前記オリフィス形成体の軸芯方向で挟持されており、
前記第１液室を前記防振基体側の主室と前記弾性仕切り膜側の副室とに仕切る仕切り部が前記第２オリフィス形成部材に一体に設けられ、前記仕切り部に前記主室と副室を連通させる第２のオリフィスが形成され、
前記弾性仕切り膜の外周部が一方の膜面の外方側と他方の膜面の外方側に膨出した膨出部に形成され、前記第１挟持部と第２挟持部が、前記弾性仕切り膜の径方向で前記膨出部よりも内方側の弾性仕切り膜部分と前記膨出部とからなる被挟持部を前記オリフィス形成体の軸芯方向で挟持するものであり、
前記弾性仕切り膜部分の第１被挟持面と、前記第１被挟持面に対する前記第１挟持部の第１挟持面との間、及び、前記弾性仕切り膜部分の第２被挟持面と、前記第２被挟持面に対する前記第２挟持部の第２挟持面との間に、振動入力時にも隙間が形成されないように、前記弾性仕切り膜部分が前記第１挟持部と第２挟持部とにより圧縮状態に挟持され、
前記弾性仕切り膜部分の前記第１被挟持面と前記第２被挟持面にそれぞれ圧縮用凸部が設けられ、前記圧縮用凸部が前記第１挟持部及び第２挟持部の内周縁を越えて径方向内方側に延在している
液封入式防振装置。 A first fixture;
A cylindrical second fixture;
An anti-vibration base made of a rubber-like elastic body that connects the first fixture and the second fixture;
A diaphragm made of a rubber film that is attached to the second fixture and forms a liquid sealing chamber between the anti-vibration base;
A partition that divides the liquid sealing chamber into a first liquid chamber on the vibration-proof base side and a second liquid chamber on the diaphragm side;
A first orifice for communicating the first liquid chamber and the second liquid chamber;
The partition body includes an annular orifice forming body in which the first orifice is formed between a peripheral wall portion of the second fixture, and an outer peripheral portion held by an inner peripheral portion of the orifice forming body. It consists of an elastic partition membrane that blocks between the inner peripheral surfaces of the formed body,
The orifice forming body includes an annular first orifice forming member provided with an orifice groove for forming the first orifice on an outer peripheral portion, and an annular second orifice forming member fitted in the first orifice forming member. Each of the first orifice forming member and the second orifice forming member is provided with a first sandwiching portion and a second sandwiching portion, respectively, and the elastic partition is formed by the first sandwiching portion and the second sandwiching portion. The outer periphery of the membrane is sandwiched in the axial direction of the orifice forming body,
A partition portion that divides the first liquid chamber into a main chamber on the vibration isolation base side and a sub chamber on the elastic partition membrane side is provided integrally with the second orifice forming member, and the main chamber and the sub chamber are provided in the partition portion. A second orifice is formed for communicating the chambers ;
An outer peripheral portion of the elastic partition membrane is formed in a bulging portion that bulges to the outer side of one membrane surface and the outer side of the other membrane surface, and the first clamping portion and the second clamping portion are said elastic A sandwiched portion composed of an elastic partition membrane portion on the inner side of the bulging portion and the bulging portion in the radial direction of the partition membrane is sandwiched in the axial direction of the orifice forming body,
Between the first sandwiched surface of the elastic partition membrane portion and the first sandwiched surface of the first sandwiching portion with respect to the first sandwiched surface; and the second sandwiched surface of the elastic partition membrane portion; The elastic partition film portion is formed between the first sandwiching portion and the second sandwiching portion so that a gap is not formed between the second sandwiching surface of the second sandwiching portion and the second sandwiching surface with respect to the second sandwiched surface even during vibration input. Sandwiched in a compressed state,
A compression convex portion is provided on each of the first sandwiched surface and the second sandwiched surface of the elastic partition membrane portion, and the compression convex portion exceeds the inner peripheral edges of the first sandwiching portion and the second sandwiching portion. A liquid-filled vibration isolator that extends radially inward . 前記弾性仕切り膜の膨出部における外周縁に径方向外方に突出するシール突条が設けられ、前記シール突条が前記第１オリフィス形成部材と第２オリフィス形成部材とにより圧縮状態に挟持された請求項１〜３のいずれか１項に記載の液封入式防振装置。 A seal ridge projecting radially outward is provided at an outer peripheral edge of the bulging portion of the elastic partition membrane, and the seal ridge is held in a compressed state by the first orifice forming member and the second orifice forming member. The liquid-filled vibration isolator according to any one of claims 1 to 3 . 前記第２オリフィス形成部材は、前記第１オリフィス形成部材に軸芯方向の一端部側から内嵌し、前記第２オリフィス形成部材の軸芯方向の一端部側に張り出し形成されたフランジが、前記第１オリフィス形成部材の軸芯方向の一端部側に形成された環状の凹部に、前記オリフィス形成体の軸芯方向で受け止められ、前記第２オリフィス形成部材の軸芯方向の他端部に前記第２挟持部が形成され、
前記第１挟持部は、前記オリフィス形成体の軸芯方向において前記第２挟持部に相対するように、前記第１オリフィス形成部材の内周部から径方向内方側に張り出す状態に第１オリフィス形成部材の内周部に形成されている請求項１〜３のいずれか１項に記載の液封入式防振装置。 The second orifice forming member is fitted into the first orifice forming member from one end side in the axial direction, and a flange formed to project from one end side in the axial direction of the second orifice forming member is An annular recess formed on one end side in the axial direction of the first orifice forming member is received in the axial direction of the orifice forming body, and the other end portion in the axial direction of the second orifice forming member is A second clamping part is formed,
The first clamping part is in a state of projecting radially inward from the inner peripheral part of the first orifice forming member so as to face the second clamping part in the axial center direction of the orifice forming body. The liquid-filled type vibration damping device according to claim 1, wherein the liquid-filled type vibration damping device is formed on an inner peripheral portion of the orifice forming member. 前記ダイヤフラムの外周部が環状の取付け板の内周部に加硫接着して、前記取付け板の外周部が前記第２取付け具の内周部に固定され、
前記オリフィス形成体は、前記取付け板と、前記防振基体に形成された受け部とにより前記オリフィス形成体の軸芯方向で挟持固定され、
前記受け部は、前記第１オリフィス形成部材の軸芯方向の一端部側の端面に圧接する環状の外側受け部分と、前記端面及び前記フランジに圧接する内側受け部分とからなり、前記内側受け部分は、前記第２取付け具の周方向に並ぶ複数の受け止め突部を前記外側受け部分から径方向内方に突出させて構成されている請求項５記載の液封入式防振装置。 The outer peripheral portion of the diaphragm is vulcanized and bonded to the inner peripheral portion of the annular mounting plate, and the outer peripheral portion of the mounting plate is fixed to the inner peripheral portion of the second fixture,
The orifice forming body is clamped and fixed in the axial direction of the orifice forming body by the mounting plate and a receiving portion formed on the vibration-proof base,
The receiving portion includes an annular outer receiving portion that is in pressure contact with an end surface on one end portion side in the axial direction of the first orifice forming member, and an inner receiving portion that is in pressure contact with the end surface and the flange. The liquid filled type vibration damping device according to claim 5 , wherein a plurality of receiving protrusions arranged in the circumferential direction of the second fixture are protruded radially inward from the outer receiving portion. 前記膨出部は縦断面円弧状に形成され、前記第１挟持部に前記一方の膜面側の膨出部分を密嵌させる縦断面円弧状の第１嵌合凹部が形成され、前記第２挟持部に前記他方の膜面側の膨出部分を密嵌させる縦断面円弧状の第２嵌合凹部が形成されている請求項１〜３のいずれか１項に記載の液封入式防振装置。 The bulging portion is formed in an arc shape in a longitudinal section, and a first fitting concave portion in an arc shape in a longitudinal section for closely fitting the bulging portion on the one film surface side is formed in the first sandwiching portion, and the second The liquid-filled vibration isolating device according to any one of claims 1 to 3, wherein a second fitting concave portion having an arcuate longitudinal section for tightly fitting the bulging portion on the other film surface side is formed in the holding portion. apparatus.
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