JP4579994B2 - Liquid-filled vibration isolator - Google Patents

Description

本発明は、液封入式防振装置に関するものである。   The present invention relates to a liquid-filled vibration isolator.

自動車エンジン等の振動源の振動を車体側に伝達しないように支承するエンジンマウント等の防振装置として、下記特許文献１には、次のような構成を持つものが開示されている。すなわち、第１取付具と第２取付具をゴム弾性体からなる防振基体で連結するとともに、防振基体が室壁の一部をなす主液室と、ダイヤフラムが室壁の一部をなす副液室を設けたエンジンマウントにおいて、主液室と副液室の間を、シェイク振動用の第１オリフィス流路と、アイドル振動の低次成分側にチューニングされた第２オリフィス流路と、アイドル振動の高次成分側にチューニングされた第３オリフィス流路とで連通させ、第３オリフィス流路の主液室側の開口部に第２ダイヤフラムを設けて第２副液室を形成している。そして、ロータリバルブを設けて、アイドル時の第２オリフィス流路及び第３オリフィス流路の開放状態と、走行時の第２オリフィス流路及び第３オリフィス流路の閉塞状態とを同時に切替制御し、これにより、アイドル振動に対する高度な防振効果を発揮するとともに、シェイク振動に対して有効な防振効果を発揮している。
特開平９−２１４４１号公報 特開２０００−２６６１０７号公報 特開平１１−２２７７８号公報 As an anti-vibration device such as an engine mount that supports the vibration of a vibration source such as an automobile engine so as not to be transmitted to the vehicle body side, the following Patent Document 1 discloses a device having the following configuration. That is, the first fixture and the second fixture are connected by a vibration-proof base made of a rubber elastic body, and the vibration-proof base forms a part of the chamber wall, and the diaphragm forms a part of the chamber wall. In the engine mount provided with the secondary liquid chamber, between the main liquid chamber and the secondary liquid chamber, a first orifice flow path for shake vibration, a second orifice flow path tuned to a low-order component side of idle vibration, Communicating with the third orifice channel tuned to the higher order component side of idle vibration, and providing a second diaphragm at the opening on the main liquid chamber side of the third orifice channel to form a second sub liquid chamber Yes. A rotary valve is provided to simultaneously control switching between the open state of the second and third orifice channels during idling and the closed state of the second and third orifice channels during traveling. As a result, a high level of anti-vibration effect against idle vibration is exhibited, and an effective anti-vibration effect against shake vibration is exhibited.
JP-A-9-21441 JP 2000-266107 A Japanese Patent Laid-Open No. 11-22778

しかしながら、上記特許文献１の構成では、走行時に設定される第２オリフィス流路及び第３オリフィス流路の閉塞状態において、大振幅振動がエンジンマウントに作用した場合、第２副液室内はロータリバルブにより閉塞状態となっている。そのため、第２ダイヤフラムは撓み変形することができず、主液室内が高い負圧状態に陥りやすく、早期にキャビテーションを発生するおそれが高い。キャビテーションは、主液室内が過度な負圧状態となって、封入された液体の飽和蒸気圧を下回ることで、多数の気泡が発生することにより生じる現象である。発生した気泡は消滅するときに衝撃音を発し、これが異音となって外部に伝達されることから、キャビテーションの発生を抑えることが求められる。   However, in the configuration of Patent Document 1, when the large amplitude vibration acts on the engine mount in the closed state of the second orifice channel and the third orifice channel set at the time of traveling, the second auxiliary liquid chamber has a rotary valve. Is closed. Therefore, the second diaphragm cannot be bent and deformed, the main liquid chamber is likely to fall into a high negative pressure state, and cavitation is likely to occur at an early stage. Cavitation is a phenomenon that occurs when a large number of bubbles are generated when the main liquid chamber is in an excessively negative pressure state and falls below the saturated vapor pressure of the sealed liquid. Since the generated bubbles emit an impact sound when they disappear and are transmitted to the outside as abnormal noises, it is required to suppress the occurrence of cavitation.

なお、上記特許文献２には、シェイク振動用の第１オリフィス流路と、アイドル振動用の第２オリフィス流路と、両オリフィス流路よりも高周波数域にチューニングされたこもり音用の第３オリフィス流路とを備えた液封入式防振装置において、第３オリフィス流路に接続された第２副液室をバルブよりも第１副液室側の第２オリフィス流路に連通せしめる連通小孔を設ける点が開示されている。しかしながら、同文献は、走行時の第２オリフィス流路の閉塞及び第３オリフィス流路の開放の状態と、アイドル時の第２オリフィス流路の開放及び第３オリフィス流路の閉塞の状態と、を切替制御するものである。そして、これにより、走行時には、第１オリフィス流路によるシェイク振動の減衰効果と、第３オリフィス流路によるこもり音の防振効果とを発揮する。また、アイドル時には、第２オリフィス流路によるアイドル振動の防振効果と、連通小孔によるアイドル６次振動などのより高周波数のアイドル振動の防振効果を発揮する。このように、同文献の連通小孔は、第２オリフィス流路と第３オリフィス流路の中間周波数域にチューニングされて、アイドル時の高次振動成分を防振するために設けられたものであり、走行時のキャビテーション対策として機能するものではない。   The above-mentioned Patent Document 2 discloses a first orifice channel for shake vibration, a second orifice channel for idle vibration, and a third for booming noise tuned to a higher frequency range than both orifice channels. In a liquid-filled vibration isolator having an orifice flow path, a small communication size allows the second sub liquid chamber connected to the third orifice flow path to communicate with the second orifice flow path closer to the first sub liquid chamber than the valve. The point of providing a hole is disclosed. However, the document discloses that the second orifice channel is closed and the third orifice channel is opened during traveling, and the second orifice channel is opened and the third orifice channel is closed during idling. Is controlled to be switched. As a result, during traveling, the damping effect of the shake vibration by the first orifice channel and the anti-vibration effect of the booming noise by the third orifice channel are exhibited. Further, at the time of idling, the anti-vibration effect of idle vibration by the second orifice channel and the anti-vibration effect of higher frequency idle vibration such as idle sixth-order vibration by the small communication hole are exhibited. As described above, the communication small hole in the same document is tuned to an intermediate frequency region between the second orifice channel and the third orifice channel, and is provided to prevent high-order vibration components during idling. Yes, it does not function as a measure against cavitation during driving.

また、上記特許文献３には、オリフィス流路がチューニングされた周波数域の入力振動に対しては実質的に閉塞状態となる微細孔（圧逃し孔）を設ける点が開示されている。しかしながら、該微細孔は、シェイク振動用のオリフィス流路が閉塞された状態において、過大な衝撃的荷重が入力されたときに、主液室の著しい内圧上昇を軽減するために設けられている。従って、該微細孔は、シェイク振動用のオリフィス流路を閉塞するアイドル時に発現するものであり、走行時のキャビテーション対策として機能するものではない。   Further, Patent Document 3 discloses that a fine hole (pressure relief hole) that is substantially closed against an input vibration in a frequency range in which the orifice channel is tuned is provided. However, the fine holes are provided to reduce a significant increase in internal pressure of the main liquid chamber when an excessive shock load is input in a state where the orifice flow path for shake vibration is closed. Therefore, the fine holes appear during idling when the orifice flow path for shake vibration is closed, and do not function as a countermeasure against cavitation during traveling.

本発明は、アイドル振動とシェイク振動のような異なる周波数域の振動に対して優れた防振効果を発揮しつつ、かつ、主液室内でのキャビテーションを抑制し得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 provides a liquid-filled vibration isolator capable of suppressing cavitation in the main liquid chamber while exhibiting excellent vibration isolation effects against vibrations in different frequency ranges such as idle vibration and shake vibration. The purpose is to do.

本発明に係る液封入式防振装置は、振動源側と支持側の一方に取り付けられる第１取付具と、振動源側と支持側の他方に取り付けられる第２取付具と、前記第１取付具と第２取付具との間に介設されたゴム状弾性体からなる防振基体と、前記防振基体が室壁の一部をなす液体が封入された主液室と、ゴム状弾性膜からなる第１ダイヤフラムが室壁の一部をなす液体が封入された第１副液室と、ゴム状弾性膜からなる第２ダイヤフラムにより前記主液室から区画形成された液体が封入された第２副液室と、前記主液室と前記第１副液室を連通させる第１オリフィス流路と、前記第１オリフィス流路よりも高周波数域にチューニングされて前記主液室と前記第１副液室を連通させる第２オリフィス流路と、前記第２オリフィス流路よりも高周波数域にチューニングされて前記第１副液室と前記第２副液室を連通させる第３オリフィス流路と、前記第２オリフィス流路と前記第３オリフィス流路の開放状態と閉塞状態を切り替えるバルブと、を備えるものである。   The liquid-filled vibration isolator according to the present invention includes a first fixture that is attached to one of the vibration source side and the support side, a second fixture that is attached to the other of the vibration source side and the support side, and the first attachment. An anti-vibration base made of a rubber-like elastic body interposed between the fixture and the second fixture, a main liquid chamber in which a liquid forming a part of a chamber wall of the anti-vibration base is enclosed, and rubber-like elasticity A first sub-liquid chamber in which a liquid in which a first diaphragm made of a membrane forms part of a chamber wall is sealed, and a liquid partitioned from the main liquid chamber is sealed by a second diaphragm made of a rubber-like elastic film. A second sub-liquid chamber, a first orifice channel that communicates the main liquid chamber and the first sub-liquid chamber, and a frequency that is higher than that of the first orifice channel to tune the main liquid chamber and the first A second orifice channel for communicating one sub-liquid chamber, and a higher frequency than the second orifice channel A third orifice passage that is tuned to communicate the first sub-liquid chamber and the second sub-liquid chamber, and a valve that switches between an open state and a closed state of the second orifice passage and the third orifice passage. , Are provided.

そして、前記第３オリフィス流路は、前記第１副液室と前記第２副液室を連通させる主流路と、前記主流路から分岐して設けられて前記第１副液室に接続されかつ前記主流路よりも断面積の小さな副流路とからなる。また、前記バルブは、前記第２オリフィス流路が開放状態であり、前記第３オリフィス流路の前記主流路が開放状態かつ前記副流路が閉塞状態である第１の状態と、前記第２オリフィス流路が閉塞状態であり、前記第３オリフィス流路の前記主流路が閉塞状態かつ前記副流路が開放状態である第２の状態とに切替制御される。   The third orifice channel is connected to the first sub-liquid chamber, and is provided with a main channel that communicates the first sub-liquid chamber and the second sub-liquid chamber, a branch from the main channel, and It consists of a subchannel having a smaller cross-sectional area than the main channel. The valve has a first state in which the second orifice channel is in an open state, the main channel of the third orifice channel is in an open state, and the sub-channel is in a closed state; The orifice flow path is closed, and the switching is controlled to the second state where the main flow path of the third orifice flow path is closed and the sub flow path is open.

このような構成によれば、上記第１の状態では、第２オリフィス流路と第３オリフィス流路の主流路が開放状態であるため、両オリフィス流路により優れた防振効果を発揮することができる。その際、第３オリフィス流路の副流路は閉塞状態であるため、第３オリフィス流路本来の防振効果を発揮することができる。一方、上記第２の状態では、第２オリフィス流路と第３オリフィス流路の主流路が閉塞状態であるため、より低周波数域にチューニングされた第１オリフィス流路による減衰性能が発揮される。その際、第１副液室と第２副液室の間が第３オリフィス流路の副流路を介して連通されているので、大振幅振動が入力して主液室内が負圧状態となったときに、該副流路を通って第１副液室から第２副液室への液体の補充がなされる。そのため、第２ダイヤフラムが主液室側に撓み変形可能となり、これにより、主液室の負圧状態が緩和されて、キャビテーションを抑制することができる。   According to such a configuration, in the first state, the main flow paths of the second orifice flow path and the third orifice flow path are in an open state, so that both the orifice flow paths exhibit an excellent vibration isolation effect. Can do. At this time, since the sub-flow channel of the third orifice channel is in a closed state, the original vibration-proof effect of the third orifice channel can be exhibited. On the other hand, in the second state, since the main flow paths of the second orifice flow path and the third orifice flow path are closed, the attenuation performance by the first orifice flow path tuned to a lower frequency range is exhibited. . At that time, since the first sub-liquid chamber and the second sub-liquid chamber are communicated with each other via the sub-channel of the third orifice channel, large amplitude vibration is input and the main liquid chamber is in a negative pressure state. When this happens, the liquid is replenished from the first sub liquid chamber to the second sub liquid chamber through the sub channel. Therefore, the second diaphragm can be bent and deformed toward the main liquid chamber, thereby reducing the negative pressure state of the main liquid chamber and suppressing cavitation.

このように、第３オリフィス流路の副流路は、第３オリフィス流路の圧力損失を調整する圧力損失調整流路として機能する。すなわち、副流路を閉じて主流路を開いている状態では、第３オリフィス流路の圧力損失は小さいので、第３オリフィス流路を液体が流れやすく、従って第３オリフィス流路本来の防振効果が発揮され、逆に、副流路を開いて主流路を閉じた状態では、第３オリフィス流路の圧力損失が大きく、従って第３オリフィス流路を液体が流れにくい。   As described above, the sub-flow path of the third orifice flow path functions as a pressure loss adjustment flow path for adjusting the pressure loss of the third orifice flow path. That is, in the state where the sub flow channel is closed and the main flow channel is opened, the pressure loss of the third orifice flow channel is small, so that the liquid easily flows through the third orifice flow channel. On the contrary, in a state where the sub flow channel is opened and the main flow channel is closed, the pressure loss of the third orifice flow channel is large, so that the liquid does not flow easily through the third orifice flow channel.

上記液封入式防振装置においては、前記第２取付具が筒状をなし、前記第１ダイヤフラムが前記第２取付具に取り付けられて前記防振基体との間に液体が封入された液室を形成し、前記液室が前記第２取付具の周壁部の内側に嵌着された仕切り部によって前記主液室と前記第１副液室とに仕切られており、前記仕切り部の主液室側部分に前記第２ダイヤフラムにより前記主液室から区画された前記第２副液室が設けられ、前記仕切り部の内部に前記バルブが設けられていることが好ましい。   In the liquid-filled vibration isolator, the second fixture has a cylindrical shape, and the first diaphragm is attached to the second fixture and the liquid chamber is sealed with the anti-vibration base. The liquid chamber is partitioned into the main liquid chamber and the first sub liquid chamber by a partition portion fitted inside the peripheral wall portion of the second fixture, and the main liquid of the partition portion It is preferable that the second sub liquid chamber partitioned from the main liquid chamber by the second diaphragm is provided in a chamber side portion, and the valve is provided in the partition portion.

また、前記仕切り部には軸方向に延びて前記第１副液室側に開口する内腔部が設けられ、前記内腔部に回転軸を前記仕切り部の軸直角方向に向けてロータリバルブからなる前記バルブが設けられ、前記内腔部の前記バルブよりも主液室側を中間室として、該中間室に前記第２オリフィス流路及び前記第３オリフィス流路が接続され、前記バルブの回転により前記第１副液室に対する前記中間室の開放状態と閉塞状態とが切り替わるよう構成されてもよい。このように第２オリフィス流路と第３オリフィス流路を中間室に集めて一方向の流れにした上で、ロータリバルブの回転により制御するようにしたので、ロータリバルブの切り替え作動角を９０度に設定することができる。これにより、切り替え作動時間を短くすることができる。   In addition, the partition portion is provided with a lumen that extends in the axial direction and opens toward the first sub-liquid chamber, and the rotary shaft is directed to a direction perpendicular to the axis of the partition from the rotary valve. And the second orifice channel and the third orifice channel are connected to the intermediate chamber with the main liquid chamber side from the valve in the lumen as an intermediate chamber, and the rotation of the valve Accordingly, an open state and a closed state of the intermediate chamber with respect to the first sub liquid chamber may be switched. As described above, the second orifice channel and the third orifice channel are collected in the intermediate chamber to make the flow in one direction and then controlled by the rotation of the rotary valve. Can be set to Thereby, the switching operation time can be shortened.

また、この場合、前記中間室に、当該中間室内を前記第２オリフィス流路が接続された側の区画と前記第３オリフィス流路が接続された側の区画とに仕切る遮断壁が設けられてもよい。遮断壁を設けたことにより、第２オリフィス流路と第３オリフィス流路の連成を防止することができる。そのため、バルブが閉塞した上記第２の状態において、第２オリフィス流路と第３オリフィス流路の連成による第１オリフィス流路の流動量の低下を防いで、減衰性能の低下を回避することができる。   In this case, the intermediate chamber is provided with a blocking wall that divides the intermediate chamber into a section on the side connected to the second orifice flow path and a section on the side connected to the third orifice flow path. Also good. By providing the blocking wall, the coupling of the second orifice channel and the third orifice channel can be prevented. Therefore, in the second state where the valve is closed, the flow rate of the first orifice channel is prevented from decreasing due to the coupling of the second orifice channel and the third orifice channel, thereby avoiding a decrease in the damping performance. Can do.

上記構成においては、前記バルブの軸方向一端部が前記内腔部に向けて開かれた嵌合凹部内に回動自在に嵌合保持され、前記バルブは、当該バルブの第１の軸直角方向に貫通して前記中間室を前記第１副液室に対して開放させる接続流路を備えるとともに、前記嵌合凹部内に保持された前記軸方向一端部において前記第１の軸直角方向に垂直な第２の軸直角方向に延びかつ前記嵌合凹部の内面との間で前記第３オリフィス流路の前記副流路を形成する凹溝を備え、前記バルブの回転により前記第３オリフィス流路の前記主流路と前記副流路の開放状態と閉塞状態を交互に切り替え可能に構成されてもよい。このように、バルブ単独で第３オリフィス流路の副流路を形成することで、仕切り部の加工が複雑にならず、低コスト化が図られる。   In the above configuration, one end portion in the axial direction of the valve is rotatably fitted and held in a fitting recess opened toward the lumen portion, and the valve is perpendicular to the first axis of the valve. And a connecting flow path that opens the intermediate chamber to the first sub liquid chamber and is perpendicular to the first axis perpendicular direction at the one axial end portion held in the fitting recess. A concave groove that extends in a direction perpendicular to the second axis and forms the sub-channel of the third orifice channel with the inner surface of the fitting recess, and the third orifice channel is rotated by the rotation of the valve. The main flow channel and the sub flow channel may be configured to be alternately switched between an open state and a closed state. Thus, by forming the sub-flow path of the third orifice flow path with the valve alone, the processing of the partition portion is not complicated, and the cost can be reduced.

本発明によれば、アイドル振動とシェイク振動のような異なる周波数域の振動に対して優れた防振効果を発揮しつつ、しかも、大振幅の振動入力時には、第３オリフィス流路の副流路からの第２副液室への液体補充により第２ダイヤフラムを介して主液室の負圧状態を緩和することができるので、キャビテーションを抑制することができる。   According to the present invention, while exhibiting an excellent anti-vibration effect against vibrations in different frequency ranges such as idle vibration and shake vibration, and when a large amplitude vibration is input, the sub-flow path of the third orifice flow path Since the negative pressure state of the main liquid chamber can be relieved through the second diaphragm by replenishing the liquid into the second sub liquid chamber from cavitation, cavitation can be suppressed.

以下、本発明の実施の形態を図面に基づいて説明する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings.

図１は、第１の実施形態に係る液封入式防振装置１０の縦断面図であり、図２は、同防振装置１０の概略構造を示すモデル的に示す説明図である。この防振装置１０は、自動車のエンジンを支承するエンジンマウントであり、振動源であるエンジン側に取り付けられる上側の第１取付具１２と、支持側の車体に取り付けられる筒状をなす下側の第２取付具１４と、これら両取付具１２，１４の間に介設されて両者を連結するゴム弾性体からなる防振基体１６と、この防振基体１６に対向して第２取付具１４に取り付けられて防振基体１６との間に液体の封入された液室１８を形成する可撓性ゴム膜からなる第１ダイヤフラム２０とを備えてなる。   FIG. 1 is a longitudinal sectional view of a liquid-filled vibration isolator 10 according to the first embodiment, and FIG. 2 is an explanatory diagram schematically showing a schematic structure of the vibration isolator 10. The vibration isolator 10 is an engine mount that supports an automobile engine, and includes an upper first fixture 12 that is attached to the engine that is a vibration source, and a cylindrical lower portion that is attached to a support-side vehicle body. The second fixture 14, a vibration isolating base 16 made of a rubber elastic body interposed between the two fixtures 12, 14 and connecting the two, and the second fixture 14 facing the vibration isolating base 16. And a first diaphragm 20 made of a flexible rubber film that forms a liquid chamber 18 in which a liquid is sealed between the anti-vibration base 16 and the anti-vibration base 16.

第１取付具１２は、第２取付具１４の軸芯部上方に配されたボス金具である。第２取付具１４は、内側に上記液室１８を形成する周壁部である筒状胴部２２と、その下端部２２Ａにかしめ締結された有底筒状部２４とからなる本体金具である。防振基体１６は、略傘状に形成され、その上部に第１取付具１２が埋設された状態に加硫接着され、下端外周部が筒状胴部２２の上端開口部２２Ｂに加硫接着されている。防振基体１６の下端部には、筒状胴部２２の内周面を覆うゴム層２６が連なっている。第１ダイヤフラム２０は、その外周部に環状の補強金具２０Ａが埋設一体化され、この補強金具２０Ａが筒状胴部２２と有底筒状部２４とのかしめ締結部に固定されている。   The first fixture 12 is a boss fitting disposed above the axial center portion of the second fixture 14. The second fixture 14 is a main body metal fitting composed of a cylindrical body portion 22 that is a peripheral wall portion that forms the liquid chamber 18 inside, and a bottomed cylindrical portion 24 that is caulked and fastened to the lower end portion 22A thereof. The anti-vibration base 16 is formed in a substantially umbrella shape, and is vulcanized and bonded in a state where the first fixture 12 is embedded in the upper portion thereof, and the lower end outer peripheral portion is vulcanized and bonded to the upper end opening 22B of the cylindrical body 22 Has been. A rubber layer 26 covering the inner peripheral surface of the cylindrical body portion 22 is connected to the lower end portion of the vibration isolation base 16. The first diaphragm 20 has an annular reinforcing metal fitting 20 </ b> A embedded and integrated in an outer peripheral portion thereof, and the reinforcing metal fitting 20 </ b> A is fixed to a caulking fastening portion between the cylindrical body portion 22 and the bottomed cylindrical portion 24.

液室１８は、筒状胴部２２の内側において、防振基体１６の下面と第１ダイヤフラム２０との間に形成されている。そして、筒状胴部２２の内側に嵌着された仕切り部２８によって、液室１８は、防振基体１６側、即ち防振基体１６が室壁の一部をなす上側の主液室１８Ａと、第１ダイヤフラム２０側、即ち第１ダイヤフラム２０が室壁の一部をなす下側の第１副液室１８Ｂとに仕切られている。また、仕切り部２８の主液室１８Ａ側部分、即ち上部に、可撓性ゴム膜からなる第２ダイヤフラム３０により主液室１８Ａから区画された第２副液室１８Ｃが設けられている。   The liquid chamber 18 is formed between the lower surface of the vibration isolation base 16 and the first diaphragm 20 inside the cylindrical body 22. And by the partition part 28 fitted inside the cylindrical trunk | drum 22, the liquid chamber 18 and the main liquid chamber 18A of the upper side which the vibration-insulating base | substrate 16 makes a part of chamber wall with the vibration-isolating base | substrate 16 side. The first diaphragm 20 side, that is, the first diaphragm 20 is partitioned into a lower first sub-liquid chamber 18B forming a part of the chamber wall. Further, a second sub liquid chamber 18C that is partitioned from the main liquid chamber 18A by a second diaphragm 30 made of a flexible rubber film is provided on the main liquid chamber 18A side portion of the partition portion 28, that is, an upper portion.

仕切り部２８は、厚肉円板状の仕切り部本体３２と、中央部に第２ダイヤフラム３０を備えて仕切り部本体３２の上面を覆蓋する蓋板部３４と、仕切り部本体３２の下面を受ける受け板部３６とからなる。そして、仕切り部２８は、受け板部３６を上記補強金具２０Ａとともに、筒状胴部２２と有底筒状部２４とのかしめ締結部に固定することにより、ゴム層２６に設けられた段部２６Ａと受け板部３６との間で軸方向（即ち、上下方向）Ｘに挟まれた状態に保持されている。ここで、仕切り板部本体３２は、上下２分割式に構成されており、上側の薄肉の第１部材３２Ａと下側の厚肉の第２部材３２Ｂとなる。また、蓋板部３４は、リング状金属板の中央開口部を塞ぐように、当該開口縁に第２ダイヤフラム３０を加硫接着することで形成されている。   The partition portion 28 receives a thick disc-shaped partition portion main body 32, a lid plate portion 34 having a second diaphragm 30 at the center and covering the upper surface of the partition portion main body 32, and a lower surface of the partition portion main body 32. It comprises a receiving plate portion 36. And the partition part 28 is fixed to the caulking fastening part of the cylindrical trunk | drum 22 and the bottomed cylindrical part 24 with the said reinforcement metal fitting 20A, and the step part provided in the rubber layer 26 is provided. 26A and the receiving plate portion 36 are held in a state of being sandwiched in the axial direction (that is, the vertical direction) X. Here, the partition plate main body 32 is configured in a vertically divided manner, and becomes an upper thin first member 32A and a lower thick second member 32B. The lid plate portion 34 is formed by vulcanizing and bonding the second diaphragm 30 to the opening edge so as to close the central opening of the ring-shaped metal plate.

仕切り部２８には、主液室１８Ａと第１副液室１８Ｂを連通させる第１オリフィス流路３８と、主液室１８Ａと第１副液室１８Ｂを連通させる第２オリフィス流路４０と、第１副液室１８Ｂと第２副液室１８Ｃを連通させる第３オリフィス流路４２とが設けられるとともに、第２オリフィス流路４０と第３オリフィス流路４２の開放状態と閉塞状態を切り替えるバルブ４４が設けられている。   The partition portion 28 includes a first orifice channel 38 that communicates the main liquid chamber 18A and the first sub-liquid chamber 18B, a second orifice channel 40 that communicates the main liquid chamber 18A and the first sub-liquid chamber 18B, and A third orifice channel 42 for communicating the first sub-liquid chamber 18B and the second sub-liquid chamber 18C is provided, and a valve for switching the open state and the closed state of the second orifice channel 40 and the third orifice channel 42 44 is provided.

第１オリフィス流路３８は、車両走行時のシェイク振動を減衰するために、シェイク振動に対応した低周波数域（例えば、５〜１５Ｈｚ程度）にチューニングされている。すなわち、第１オリフィス流路３８を通じて流動する液体の共振作用に基づく減衰効果がシェイク振動の入力時に有効に発揮されるように、流路の断面積及び長さを調整することによってチューニングされている。   The first orifice channel 38 is tuned to a low frequency range (for example, about 5 to 15 Hz) corresponding to the shake vibration in order to attenuate the shake vibration when the vehicle travels. That is, tuning is performed by adjusting the cross-sectional area and length of the flow path so that the damping effect based on the resonance action of the liquid flowing through the first orifice flow path 38 is effectively exhibited when the shake vibration is input. .

第２オリフィス流路４０は、第１オリフィス流路３８よりも高周波数域でありかつ第３オリフィス流路４２よりも低周波数域である中周波数域にチューニングされたオリフィス流路である。ここでは、アイドル時（車両停止時）のアイドル振動のうち、エンジンの回転成分そのもののような低周波数域の振動を低減するために、当該低周波数域のアイドル振動（例えば、１０〜１５Ｈｚ程度）にチューニングされている。すなわち、第２オリフィス流路４０を通じて流動する液体の共振作用に基づく減衰効果が上記低周波数域のアイドル振動の入力時に有効に発揮されるように、流路の断面積及び長さを調整することによってチューニングされている。   The second orifice channel 40 is an orifice channel tuned to a medium frequency region that is higher in frequency than the first orifice channel 38 and lower in frequency than the third orifice channel 42. Here, in order to reduce the low-frequency vibration such as the engine rotation component itself among the idle vibration at the time of idling (when the vehicle is stopped), the low-frequency idle vibration (for example, about 10 to 15 Hz). It has been tuned to. That is, the cross-sectional area and the length of the flow path are adjusted so that the damping effect based on the resonance action of the liquid flowing through the second orifice flow path 40 is effectively exhibited when the idle vibration in the low frequency range is input. Has been tuned by.

第３オリフィス流路４２は、第２オリフィス流路４０よりも高周波数域にチューニングされたオリフィス流路である。ここでは、アイドル振動のうち、エンジンの爆発１次成分のような高周波数域の振動を低減するために、当該高周波数域のアイドル振動（例えば、３０〜５０Ｈｚ程度）にチューニングされている。すなわち、第３オリフィス流路４２を通じて流動する液体の共振作用に基づく低動ばね効果が上記高周波数域のアイドル振動の入力時に有効に発揮されるように、流路の断面積及び長さを調整することによってチューニングされている。   The third orifice channel 42 is an orifice channel tuned to a higher frequency range than the second orifice channel 40. Here, in order to reduce vibrations in a high frequency region such as an explosion primary component of an engine among idle vibrations, tuning is performed to the high frequency region idle vibrations (for example, about 30 to 50 Hz). That is, the cross-sectional area and length of the flow path are adjusted so that the low dynamic spring effect based on the resonance action of the liquid flowing through the third orifice flow path 42 is effectively exhibited when the idle vibration in the high frequency range is input. Has been tuned by.

詳細には、図１，３，５に示すように、仕切り部本体３２の上面の外周部には周方向Ｃに延びる平面視円弧状の第１の溝４６が設けられ、この第１の溝４６の一端部は、仕切り部本体３２を貫通して軸方向Ｘに延びる貫通孔４８により第１副液室１８Ｂに開口している。また、仕切り部本体３２の上面における第１の溝４６よりも内周側には周方向Ｃに延びる平面視円弧状の第２の溝５０が設けられ、この第２の溝５０の一端部には第１部材３２Ａを貫通する貫通孔５２が設けられている。更に、仕切り部本体３２の上面の中央部には、円形の凹所５４が設けられ、この凹所５４には上記第１部材３２Ａを貫通する貫通孔５６が設けられている。   Specifically, as shown in FIGS. 1, 3, and 5, a first groove 46 having a circular arc shape in a plan view extending in the circumferential direction C is provided on the outer peripheral portion of the upper surface of the partition body 32, and the first groove One end of 46 opens to the first sub liquid chamber 18 </ b> B through a through hole 48 that extends through the partition portion main body 32 and extends in the axial direction X. Further, a second groove 50 having a circular arc shape in a plan view extending in the circumferential direction C is provided on the inner peripheral side of the upper surface of the partition portion main body 32 from the first groove 46, and one end portion of the second groove 50 is provided at one end portion of the second groove 50. Is provided with a through hole 52 penetrating the first member 32A. Further, a circular recess 54 is provided in the center of the upper surface of the partition body 32, and a through hole 56 that penetrates the first member 32A is provided in the recess 54.

図１，４に示すように、仕切り部本体３２の上面に重ね合わされる蓋板部３４には、第１の溝４６の他端部に対応する位置に通孔５８が設けられ、また、第２の溝５０の他端部に対応する位置に通孔６０が設けられている。   As shown in FIGS. 1 and 4, the cover plate portion 34 superimposed on the upper surface of the partition portion main body 32 is provided with a through hole 58 at a position corresponding to the other end portion of the first groove 46. A through hole 60 is provided at a position corresponding to the other end of the second groove 50.

仕切り部本体３２における第１部材３２Ａの下面に重ね合わさせる第２部材３２Ｂには、軸方向Ｘに貫通する内腔部６２が形成されており、これにより、仕切り部２８には、軸方向Ｘに延びて第１副液室１８Ｂ側に開口する内腔部６２が設けられている。内腔部６２は、上記凹所５４と軸方向Ｘで重なるように仕切り部２８の中央部に設けられている。第２部材３２Ｂには、また、上記第２の溝５０から延びる貫通孔５２の下端と内腔部６２とを接続する軸直角方向Ｙに延びる第１の接続溝６４が設けられるとともに、上記凹所５４から延びる貫通孔５６の下端と内腔部６２とを接続する軸直角方向Ｙに延びる第２の接続溝６６が設けられている。貫通孔５２と貫通孔５６は、仕切り部２８の中心に位置する内腔部６２を挟んで軸直角方向Ｙに対向する位置に設けられており、従って、第１の接続溝６４と第２の接続溝６６は、図３に示すように直線状に形成されている。   The second member 32B that is superimposed on the lower surface of the first member 32A in the partition portion main body 32 is formed with a lumen portion 62 that penetrates in the axial direction X, whereby the partition portion 28 has an axial direction X in the axial direction X. A lumen 62 that extends and opens to the first sub-liquid chamber 18B side is provided. The lumen 62 is provided at the center of the partition 28 so as to overlap the recess 54 in the axial direction X. The second member 32B is also provided with a first connection groove 64 extending in the direction perpendicular to the axis Y for connecting the lower end of the through hole 52 extending from the second groove 50 and the lumen 62, and the concave portion. A second connection groove 66 extending in the direction perpendicular to the axis Y that connects the lower end of the through hole 56 extending from the point 54 and the lumen 62 is provided. The through-hole 52 and the through-hole 56 are provided at positions that oppose each other in the direction perpendicular to the axis Y with the lumen 62 located at the center of the partition portion 28 interposed therebetween. The connection groove 66 is formed in a straight line as shown in FIG.

第２部材３２Ｂには、また、図５に示すように、軸直角方向Ｙに延びる断面円形のバルブ装着孔６８が、内腔部６２を横断するように設けられており、このバルブ装着孔６８にバルブ４４が回動自在に装着されている。すなわち、バルブ４４は、回転軸を仕切り部２８の軸直角方向Ｙに向けて内腔部６２に配されたロータリバルブであり、バルブ４４の軸方向両端部４４Ａ，４４Ｂが、内腔部６２に向けて開かれた各嵌合凹部７０，７０内に回動自在に嵌合保持されている。   As shown in FIG. 5, the second member 32 </ b> B is provided with a valve mounting hole 68 having a circular cross section extending in the direction perpendicular to the axis Y so as to cross the lumen portion 62, and this valve mounting hole 68. A valve 44 is rotatably mounted on. That is, the valve 44 is a rotary valve disposed in the lumen 62 with the rotation axis directed in the direction perpendicular to the axis Y of the partition portion 28, and both axial ends 44 </ b> A and 44 </ b> B of the valve 44 are connected to the lumen 62. It is fitted and held in each fitting recess 70, 70 that is open to turn.

詳細には、バルブ装着孔６８は、軸直角方向Ｙの一方側に開口するバルブ４４を挿入するための挿入室６８Ａと、バルブ４４が嵌合保持される保持室６８Ｂと、バルブ４４を回転駆動させるためのアクチュエータ７２の駆動軸７４が挿入される駆動室６８Ｃとからなる。挿入室６８Ａから挿入されたバルブ４４は、円板状の係止部材７６を圧入することにより抜脱不能に保持室６８Ｂに保持され、係止部材７６により形成される嵌合凹部７０内に軸方向一端部４４Ａが保持されている。一方、軸方向他端部４４Ｂには、バルブ４４の軸方向Ｓに突出する被駆動軸４４Ｃが突設され、該被駆動軸４４Ｃが、保持室６８Ｂと駆動室６８Ｃを連通するシール室６８Ｄに挿通されてＯリング７８によりシールされるとともに、駆動室６８Ｃ側に突出して駆動軸７４と連結されている。   More specifically, the valve mounting hole 68 rotates and drives the insertion chamber 68A for inserting the valve 44 opened on one side in the direction perpendicular to the axis Y, the holding chamber 68B in which the valve 44 is fitted and held, and the valve 44. And a drive chamber 68C into which the drive shaft 74 of the actuator 72 is inserted. The valve 44 inserted from the insertion chamber 68 </ b> A is held in the holding chamber 68 </ b> B so that it cannot be removed by press-fitting a disc-shaped locking member 76, and the shaft 44 is fitted in the fitting recess 70 formed by the locking member 76. One direction end 44A is held. On the other hand, a driven shaft 44C that protrudes in the axial direction S of the valve 44 protrudes from the other axial end 44B, and the driven shaft 44C communicates with a seal chamber 68D that communicates the holding chamber 68B and the drive chamber 68C. It is inserted and sealed by an O-ring 78, and protrudes toward the drive chamber 68C and is connected to the drive shaft 74.

上記内腔部６２におけるバルブ４４よりも主液室１８Ａ側の部分を中間室８０としたとき、バルブ４４には、当該バルブ４４の第１の軸直角方向Ｔ１（図６（ｂ）参照）に貫通して中間室８０を第１副液室１８Ｂに対して開放させる接続流路８２が形成されている。そして、バルブ４４の回転により、第１副液室１８Ｂに対する中間室８０の開放状態（図７（ａ）の状態）と閉塞状態（図７（ｂ）の状態）とが切り替わるよう構成されている。   When the portion of the lumen 62 closer to the main liquid chamber 18A than the valve 44 is the intermediate chamber 80, the valve 44 has a first axis perpendicular direction T1 of the valve 44 (see FIG. 6B). A connection channel 82 is formed to penetrate through and open the intermediate chamber 80 to the first auxiliary liquid chamber 18B. Then, by the rotation of the valve 44, the open state (the state in FIG. 7A) and the closed state (the state in FIG. 7B) of the intermediate chamber 80 with respect to the first sub liquid chamber 18B are switched. .

また、中間室８０には、その内部を、第１の接続溝６４が接続された側の区画８０Ａと、第２の接続溝６６が接続された側の区画８０Ｂとに仕切る遮断壁８４が軸方向Ｘに沿って設けられている。   Further, the intermediate chamber 80 has a blocking wall 84 that divides the interior into a section 80A on the side to which the first connection groove 64 is connected and a section 80B on the side to which the second connection groove 66 is connected. It is provided along the direction X.

以上のように構成された仕切り部２８においては、蓋板部３４を仕切り部本体３２の上面に被せることで、上記通孔５８と第１の溝４６と貫通孔４８とにより、常時開放の第１オリフィス流路３８が形成されている。また、主液室１８Ａから、上記通孔６０、第２の溝５０、貫通孔５２、第１の接続溝６４及び中間室８０の上記区画８０Ａを通って、第１副液室１８Ｂ側に連通される第２オリフィス流路４０が形成されている。また、凹所５４が蓋板部３４の第２ダイヤフラム３０に覆蓋されることで、第２副液室１８Ｃが形成されるとともに、第２副液室１８Ｃから、上記貫通孔５６、第２の接続溝６６及び中間室８０の上記区画８０Ｂを通って、第１副液室１８Ｂ側に連通される第３オリフィス流路４２が形成されている。   In the partition portion 28 configured as described above, the cover plate portion 34 is covered on the upper surface of the partition portion main body 32, so that the first through-holes 58, the first grooves 46, and the through-holes 48 are always open. A single orifice channel 38 is formed. Further, the main liquid chamber 18A communicates with the first sub liquid chamber 18B through the through hole 60, the second groove 50, the through hole 52, the first connection groove 64, and the section 80A of the intermediate chamber 80. A second orifice channel 40 is formed. Further, the recess 54 is covered with the second diaphragm 30 of the cover plate portion 34, whereby the second sub liquid chamber 18C is formed, and the through hole 56, the second sub liquid chamber 18C is formed from the second sub liquid chamber 18C. A third orifice channel 42 communicating with the first sub liquid chamber 18B side through the connection groove 66 and the section 80B of the intermediate chamber 80 is formed.

ここにおいて、上記第３オリフィス流路４２は、第１副液室１８Ｂと第２副液室１８Ｃを連通させる主流路４２Ａと、該主流路４２Ａから中間室８０を介さずに分岐して設けられて第１副液室１８Ｂに接続される副流路４２Ｂとで構成されている。主流路４２Ａと副流路４２Ｂは、バルブ４４によって交互に開放状態と閉塞状態が切り替えられるように構成されており、従って、第３オリフィス流路４２は、主流路４２Ａと副流路４２Ｂのいずれかが常時開放している。   Here, the third orifice flow path 42 is provided by branching from the main flow path 42A without the intermediate chamber 80 through the main flow path 42A for communicating the first sub liquid chamber 18B and the second sub liquid chamber 18C. And a secondary flow path 42B connected to the first secondary liquid chamber 18B. The main flow path 42A and the sub flow path 42B are configured to be alternately switched between an open state and a closed state by the valve 44. Therefore, the third orifice flow path 42 is either the main flow path 42A or the sub flow path 42B. Is always open.

主流路４２Ａは、上記した高周波数域のアイドル振動を低減するためにチューニングされた本来の流路である。一方、副流路４２Ｂは、第３オリフィス流路４２の圧力損失を調整するための圧力損失調整流路として機能するものであり、主流路４２Ａよりも断面積が十分に小さく設定された微細流路である。すなわち、副流路４２Ｂを閉じて主流路４２Ａを開いている状態では、第３オリフィス流路４２の圧力損失は小さく、そのため、第３オリフィス流路４２を液体が流れやすいので、第３オリフィス流路４２本来の防振効果が発揮される。逆に、副流路４２Ｂを開いて主流路４２Ａを閉じた状態では、第３オリフィス流路４２の圧力損失が大きく、そのため、第３オリフィス流路４２を液体が流れにくくなっている。   The main flow path 42A is an original flow path tuned to reduce the above-described idle vibration in the high frequency range. On the other hand, the secondary flow path 42B functions as a pressure loss adjustment flow path for adjusting the pressure loss of the third orifice flow path 42, and a fine flow having a cross-sectional area set sufficiently smaller than the main flow path 42A. Road. That is, in the state where the sub flow path 42B is closed and the main flow path 42A is opened, the pressure loss of the third orifice flow path 42 is small, so that the liquid easily flows through the third orifice flow path 42. The original vibration isolation effect of the road 42 is exhibited. On the contrary, in the state where the sub flow path 42B is opened and the main flow path 42A is closed, the pressure loss of the third orifice flow path 42 is large, so that it is difficult for the liquid to flow through the third orifice flow path 42.

このように、副流路４２Ｂを通しての第３オリフィス流路４２の流動抵抗は、主流路４２Ａを通しての第３オリフィス流路４２の流動抵抗よりも著しく大きく設定されている。また、副流路４２Ｂは、第１オリフィス流路３８及び第２オリフィス流路４０よりも断面積が十分に小さく設定されており、副流路４２Ｂを通しての第３オリフィス流路４２の流動抵抗が、第１オリフィス流路３８や第２オリフィス流路４０の流動抵抗よりも大きく設定されている。   As described above, the flow resistance of the third orifice channel 42 through the sub-channel 42B is set to be significantly larger than the flow resistance of the third orifice channel 42 through the main channel 42A. The sub-flow channel 42B is set to have a sufficiently smaller cross-sectional area than the first orifice channel 38 and the second orifice channel 40, and the flow resistance of the third orifice channel 42 through the sub-channel 42B is reduced. The flow resistance of the first orifice channel 38 and the second orifice channel 40 is set larger.

副流路４２Ｂは、仕切り部本体３２の上記第２の接続溝６６から軸方向Ｘに貫通して設けられている。そして、図１，５に示すように、嵌合凹部７０内に保持されたバルブ４４の軸方向一端部４４Ａには、副流路４２を連通させる連通孔８６が設けられている。連通孔８６は、図６に示すように、接続流路８２の貫通方向である第１の軸直角方向Ｔ１に対して垂直な第２の軸直角方向Ｔ２に貫通するように設けられている。   The sub flow path 42 </ b> B is provided so as to penetrate in the axial direction X from the second connection groove 66 of the partition portion main body 32. As shown in FIGS. 1 and 5, a communication hole 86 for communicating the sub-flow channel 42 is provided at one axial end 44 </ b> A of the valve 44 held in the fitting recess 70. As shown in FIG. 6, the communication hole 86 is provided so as to penetrate in the second axis perpendicular direction T <b> 2 perpendicular to the first axis perpendicular direction T <b> 1 that is the penetration direction of the connection channel 82.

これにより、第２オリフィス流路４０及び第３オリフィス流路４２は、バルブ４４の回転によって、
（１）第２オリフィス流路４０が開放状態であり、第３オリフィス流路４２の主流路４２Ａが開放状態かつ副流路４２Ｂが閉塞状態である第１の状態（図１及び図７（ａ）の状態）と、
（２）第２オリフィス流路４０が閉塞状態であり、第３オリフィス流路４２の主流路４２Ａが閉塞状態かつ副流路４２Ｂが開放状態である第２の状態（図５及び図７（ｂ）の状態）と、
に切替制御される。なお、第１オリフィス流路３８は常時開放状態である。 Thereby, the second orifice channel 40 and the third orifice channel 42 are rotated by the rotation of the valve 44.
(1) A first state in which the second orifice channel 40 is in an open state, the main channel 42A of the third orifice channel 42 is in an open state, and the sub-channel 42B is in a closed state (FIGS. 1 and 7 (a) ))
(2) A second state in which the second orifice channel 40 is in a closed state, the main channel 42A of the third orifice channel 42 is in a closed state, and the sub-channel 42B is in an open state (FIGS. 5 and 7 (b) ))
Is controlled to be switched. The first orifice channel 38 is always open.

以上よりなる本実施形態の防振装置１０であると、停車したアイドル時には、バルブ４４を回転させて上記第１の状態とする。このとき、第２オリフィス流路４０と第３オリフィス流路４２の主流路４２Ａが開放状態であるため、両オリフィス流路４０，４２を通じての液体の共振作用により、アイドル振動に対する優れた防振効果を発揮することができる。その際、第３オリフィス流路４２の副流路４２Ｂは閉塞状態であるため、主流路４２Ａでの流量低下を防止して、第３オリフィス流路４２本来の防振効果を発揮することができる。また、第２オリフィス流路４０と第３オリフィス流路４２の主流路４２Ａを比較した場合、前者の方が低周波数側にチューニングされているため、一般的には流動抵抗が高く液体流動量が十分に確保されないおそれがあるが、上記のように第３オリフィス流路４２を第２ダイヤフラム３０を介して主液室１８Ａと区画形成された第２副液室１８Ｃに接続しているので、双方のオリフィス流路４０，４２の機能を効果的に発揮させることができる。なお、この場合、第１オリフィス流路３８も開放状態であるが、第１オリフィス流路３８は更に低周波数側にチューニングされているため、液体の流動抵抗が大きく実質的に目詰まりした状態となる。   In the vibration isolator 10 of the present embodiment configured as described above, the valve 44 is rotated to enter the first state when the vehicle is idle. At this time, since the main flow path 42A of the second orifice flow path 40 and the third orifice flow path 42 is in an open state, an excellent vibration-proofing effect against idle vibration due to the resonance action of the liquid through both the orifice flow paths 40 and 42. Can be demonstrated. At this time, since the sub-flow path 42B of the third orifice flow path 42 is in the closed state, the flow rate drop in the main flow path 42A can be prevented and the original vibration-proofing effect of the third orifice flow path 42 can be exhibited. . Further, when comparing the main flow path 42A of the second orifice flow path 40 and the third orifice flow path 42, the former is tuned to the low frequency side, so that generally the flow resistance is high and the liquid flow rate is high. Although there is a possibility that it is not sufficiently secured, both the third orifice channel 42 is connected to the main liquid chamber 18A and the second sub-liquid chamber 18C formed through the second diaphragm 30 as described above. The functions of the orifice channels 40 and 42 can be effectively exhibited. In this case, the first orifice channel 38 is also in an open state, but the first orifice channel 38 is further tuned to the lower frequency side, so that the liquid flow resistance is large and substantially clogged. Become.

一方、車両走行時には、バルブ４４を回転させて上記第２の状態とする。これにより、第２オリフィス流路４０と第３オリフィス流路４２の主流路４２Ａが閉塞されるため、第１オリフィス流路３８を流動する液体の共振作用に基づき、シェイク振動（通常は振幅０．５ｍｍ程度）に対して減衰性能が発揮される。なお、このとき、第３オリフィス流路４２の副流路４２Ｂも開放状態であるが、副流路４２Ｂを通しての第３オリフィス流路４２の液体の流動は、圧力損失が大きいことから起こりにくく、従って、走行時の減衰性能の低下を抑えることができる。   On the other hand, when the vehicle travels, the valve 44 is rotated to enter the second state. As a result, the main flow path 42A of the second orifice flow path 40 and the third orifice flow path 42 is closed, so that the shake vibration (usually amplitude 0. Attenuation performance is exhibited with respect to about 5 mm). At this time, the secondary flow path 42B of the third orifice flow path 42 is also in an open state, but the liquid flow of the third orifice flow path 42 through the secondary flow path 42B is unlikely to occur due to a large pressure loss. Accordingly, it is possible to suppress a decrease in the attenuation performance during traveling.

また、かかる車両走行時において、大振幅振動（通常は振幅２ｍｍ程度）が入力して主液室１８Ａ内が負圧状態となったときには、第１副液室１８Ｂと第２副液室１８Ｃの間が第３オリフィス流路４２の副流路４２Ｂを介して連通されているので、該副流路４２Ｂを通って第１副液室１８Ｂから第２副液室１８Ｃへの液体の補充がなされる。すなわち、副流路４２Ｂは流れにくいものであるが、開放状態にあるため、主液室１８Ａの過大な負圧状態下では、液体の流動が生ずる。そのため、第２ダイヤフラム３０が主液室１８Ａ側に撓み変形可能となり、これにより、主液室１８Ａの負圧状態が緩和されて、キャビテーションを抑制することができる。よって、走行時の減衰性能を確保しながら、キャビテーション対策を行うことができる。   Further, when a large amplitude vibration (usually about 2 mm amplitude) is input during the traveling of the vehicle and the inside of the main liquid chamber 18A is in a negative pressure state, the first sub liquid chamber 18B and the second sub liquid chamber 18C Since the space is communicated via the sub-flow path 42B of the third orifice flow path 42, the liquid is replenished from the first sub-liquid chamber 18B to the second sub-liquid chamber 18C through the sub-flow path 42B. The That is, although the sub flow path 42B is difficult to flow, since it is in an open state, the liquid flows under the excessive negative pressure state of the main liquid chamber 18A. Therefore, the second diaphragm 30 can be bent and deformed toward the main liquid chamber 18A, thereby reducing the negative pressure state of the main liquid chamber 18A and suppressing cavitation. Therefore, it is possible to take measures against cavitation while ensuring the damping performance during traveling.

また、本実施形態であると、第２オリフィス流路４０と第３オリフィス流路４２をバルブ４４の直上に配置した中間室８０に集合させ、一方向の流れにした上で、バルブ４４の回転により両オリフィス流路４０，４２の開閉制御をするようにしたので、バルブ４４の切り替え作動角が９０度となり、そのため、切り替え作動時間を短くすることができる。   Further, in the present embodiment, the second orifice channel 40 and the third orifice channel 42 are gathered in the intermediate chamber 80 disposed immediately above the valve 44 and flow in one direction, and then the rotation of the valve 44 is performed. Thus, the opening / closing control of both the orifice channels 40 and 42 is performed, so that the switching operation angle of the valve 44 becomes 90 degrees, so that the switching operation time can be shortened.

また、中間室８０に第２オリフィス流路４０と第３オリフィス流路４２を区画する遮断壁８４が設けられたので、車両走行時の上記第２の状態における第２オリフィス流路４０と第３オリフィス流路４２の連成による第１オリフィス流路３８の流動量の低下を防ぐことができる。すなわち、第２の状態のときに、主液室１８Ａから第２副液室１８Ｃへの液体の流動を防止することができる。そのため、第１オリフィス流路３８による減衰性能の低下を回避することができる。   In addition, since the intermediate chamber 80 is provided with the blocking wall 84 that divides the second orifice channel 40 and the third orifice channel 42, the second orifice channel 40 and the third orifice channel in the second state when the vehicle travels. A decrease in the flow rate of the first orifice channel 38 due to the coupling of the orifice channels 42 can be prevented. That is, in the second state, it is possible to prevent the liquid from flowing from the main liquid chamber 18A to the second sub liquid chamber 18C. Therefore, it is possible to avoid a decrease in attenuation performance due to the first orifice channel 38.

また、本実施形態であると、第３オリフィス流路４２の副流路４２Ｂが第３オリフィス流路４２の途中の第２の接続溝６６から直下に延びて形成されているので、主流路４２Ａと副流路４２Ｂを持つ第３オリフィス流路４２の形成が容易である。そのため、仕切り部２８の構造の簡素化によって低コスト化が図られる。   Further, in the present embodiment, the sub-flow channel 42B of the third orifice flow channel 42 is formed to extend directly from the second connection groove 66 in the middle of the third orifice flow channel 42, so the main flow channel 42A. It is easy to form the third orifice channel 42 having the sub channel 42B. Therefore, the cost can be reduced by simplifying the structure of the partition portion 28.

図８は、第２の実施形態における仕切り部２８の構成を示したものであり、図９は、同実施形態のバルブ４４の構成を示したものである。同実施形態は、第１の実施形態に対して、第３オリフィス流路４２の副流路４２Ｂの構成が異なる。   FIG. 8 shows the configuration of the partition portion 28 in the second embodiment, and FIG. 9 shows the configuration of the valve 44 of the same embodiment. This embodiment is different from the first embodiment in the configuration of the sub-flow path 42B of the third orifice flow path 42.

この例では、バルブ４４の外面に、上記副流路４２Ｂを形成するための凹溝８８が設けられている。凹溝８８は、嵌合凹部７０内に保持されたバルブ４４の軸方向一端部４４Ａにおいて、上記第１の軸直角方向Ｔ１に垂直な第２の軸直角方向Ｔ２に延び、かつ嵌合凹部７０の内面との間で第３オリフィス流路４２の副流路４２Ｂを形成するものである。   In this example, a concave groove 88 for forming the sub-flow channel 42B is provided on the outer surface of the valve 44. The concave groove 88 extends in the second axially perpendicular direction T2 perpendicular to the first axially perpendicular direction T1 at the axially one end 44A of the valve 44 held in the engaging recessed part 70, and the fitted recessed part 70. The secondary flow path 42B of the third orifice flow path 42 is formed between the inner surface of the first orifice flow path 42 and the inner surface of the third orifice flow path 42.

より詳細には、凹溝８８は、中間室８０の上記第３オリフィス流路４２が接続された側の区画８０Ｂ側のバルブ端部４４Ａにおいて、係止部材７６に当接配置される軸方向端面４４Ａ１を上記第２の軸直角方向Ｔ２に沿って横断する溝部分８８Ａと、該溝部分８８Ａの両端部からバルブ４４の外周面上を内腔部６２に達するまで軸方向Ｓに延びる一対の溝部分８８Ｂ，８８Ｂとで構成されている。   More specifically, the concave groove 88 is an axial end surface disposed in contact with the locking member 76 at the valve end 44A on the side of the partition 80B on the side to which the third orifice channel 42 of the intermediate chamber 80 is connected. A pair of grooves extending in the axial direction S from both end portions of the groove portion 88A to the inner cavity portion 62 on the outer peripheral surface of the valve 44. It consists of portions 88B and 88B.

これにより、図８に示すように、バルブ４４の回転により、第２オリフィス流路４０と第３オリフィス流路４２の主流路４２Ａを閉塞した状態で、凹溝８８の一端部が第３オリフィス流路４２（詳細には、中間室８０の第３オリフィス流路４２側の区画８０Ｂ）に接続されるとともに、凹溝８８の他端部が第１副液室１８Ｂ側の内腔部６２に接続されて、第３オリフィス流路４２の主流路４２Ａから分岐した副流路４２Ｂが現れる。また、バルブ４４の回転により、第２オリフィス流路４０と第３オリフィス流路４２の主流路４２Ａを開放することで、該副流路４２Ｂが閉塞される。   As a result, as shown in FIG. 8, one end portion of the concave groove 88 is in the third orifice flow in a state where the main flow path 42 </ b> A of the second orifice flow path 40 and the third orifice flow path 42 is closed by the rotation of the valve 44. It is connected to the passage 42 (specifically, the section 80B of the intermediate chamber 80 on the side of the third orifice channel 42), and the other end of the groove 88 is connected to the lumen 62 on the side of the first auxiliary liquid chamber 18B. As a result, a sub-flow channel 42B branched from the main flow channel 42A of the third orifice flow channel 42 appears. Further, by opening the main flow path 42A of the second orifice flow path 40 and the third orifice flow path 42 by the rotation of the valve 44, the sub flow path 42B is closed.

そのため、第１の実施形態と同様に、バルブ４４の回転により、第３オリフィス流路４２の主流路４２Ａと副流路４２Ｂの開放状態と閉塞状態を交互に切り替えることができるので、上記第１の実施形態と同様の作用効果が奏される。しかも、この実施形態では、バルブ４４単独で第３オリフィス流路４２の副流路４２Ｂを形成することで、仕切り部２８の加工が複雑にならず、低コスト化が図られる。なお、第２の実施形態のその他の構成は第１の実施形態と同様であるため、説明は省略する。   Therefore, as in the first embodiment, the open state and the closed state of the main flow path 42A and the sub flow path 42B of the third orifice flow path 42 can be alternately switched by the rotation of the valve 44. The same effects as those of the embodiment are exhibited. Moreover, in this embodiment, the valve 44 alone forms the auxiliary flow path 42B of the third orifice flow path 42, so that the processing of the partition portion 28 is not complicated and the cost can be reduced. In addition, since the other structure of 2nd Embodiment is the same as that of 1st Embodiment, description is abbreviate | omitted.

図１０〜１２は、第３の実施形態を示したものである。同実施形態は、中間室８０の構成が上記第１の実施形態とは異なる。すなわち、この例では、中間室８０には遮断壁８４が設けられておらず、第２オリフィス流路４０と第３オリフィス流路４２は中間室８０において合流している。   10 to 12 show a third embodiment. In the embodiment, the configuration of the intermediate chamber 80 is different from that of the first embodiment. In other words, in this example, the intermediate chamber 80 is not provided with the blocking wall 84, and the second orifice channel 40 and the third orifice channel 42 merge in the intermediate chamber 80.

仕切り部２８の軸方向Ｘに垂直な断面での中間室８０の断面積は、第２オリフィス流路４０の断面積と第３オリフィス流路４２の断面積の和よりも大きく設定されており、中間室８０を絞り流路として効かせないようにしている。これにより、第２オリフィス流路４０としての共振作用を発揮する部分は、主液室１８Ａから中間室８０までとされており、また、第３オリフィス流路４２の主流路４２Ａとしての共振作用を発揮する部分は、第２副液室１８Ｃから中間室８０までとされている。そのため、両オリフィス流路４０，４２Ａの曲がり部を最小限に留めることができる。すなわち、かかる中間室８０がない場合、水平方向に延びる両オリフィス流路４０，４２Ａを流れを、上下方向の流れに変換する曲がり部が必要とするが、該曲がり部が不要となる。そのため、曲がり部における圧力損失を最小限に留め、高い防振性能を発揮することができる。   The cross-sectional area of the intermediate chamber 80 in a cross section perpendicular to the axial direction X of the partition portion 28 is set larger than the sum of the cross-sectional area of the second orifice channel 40 and the cross-sectional area of the third orifice channel 42, The intermediate chamber 80 is made ineffective as a throttle channel. As a result, the portion exhibiting the resonance action as the second orifice flow path 40 is from the main liquid chamber 18A to the intermediate chamber 80, and the resonance action as the main flow path 42A of the third orifice flow path 42 is performed. The portion to be exhibited is from the second sub liquid chamber 18C to the intermediate chamber 80. Therefore, the bent portions of both the orifice channels 40 and 42A can be minimized. That is, in the absence of such an intermediate chamber 80, a bent portion for converting the flow into both the orifice flow paths 40, 42A extending in the horizontal direction into a flow in the vertical direction is required, but the bent portion is not necessary. Therefore, the pressure loss at the bent portion can be kept to a minimum, and high vibration isolation performance can be exhibited.

その他の構成は上記第１の実施形態と同様であり、同様の作用効果が奏される。但し、遮断壁８４がない場合、第２オリフィス流路４０と第３オリフィス流路４２の主流路４２Ａを閉塞した状態で、第２オリフィス流路４０と第３オリフィス流路４２の連成により、主液室１８Ａから第２副液室１８Ｃへの液体の流動が懸念され、かかる液体の流動によって、第１オリフィス流路３８の液体の流動量が低下し、第１オリフィス流路３８による減衰性能が低下してしまう。そのため、第１オリフィス流路３８での減衰性能の低下を抑制する上では、遮断壁を設けた方が好ましい。   Other configurations are the same as those of the first embodiment, and the same effects are achieved. However, when the blocking wall 84 is not provided, the second orifice channel 40 and the third orifice channel 42 are coupled with each other while the main channel 42A of the second orifice channel 40 and the third orifice channel 42 is closed. There is a concern about the flow of liquid from the main liquid chamber 18A to the second sub liquid chamber 18C, and the flow of liquid in the first orifice channel 38 decreases due to the flow of such liquid, and the damping performance by the first orifice channel 38 is reduced. Will fall. For this reason, in order to suppress a decrease in the attenuation performance in the first orifice flow path 38, it is preferable to provide a blocking wall.

なお、上記実施形態では、シェイク振動とアイドル振動を対象としたが、これに限らず、周波数の異なる種々の振動に対して適用することができる。また、内筒と外筒の間を防振基体で結合してなる円筒型の液封入式防振装置に適用してもよく、更に、エンジンマウント以外にも、ボディマウント、デフマウントなど、種々の防振装置に適用可能である。その他、一々列挙しないが、本発明の趣旨を逸脱しない限り、種々の変更が可能である。   In the above embodiment, shake vibration and idle vibration are targeted, but the present invention is not limited to this, and can be applied to various vibrations having different frequencies. Moreover, the present invention may be applied to a cylindrical liquid-filled vibration isolator in which an inner cylinder and an outer cylinder are coupled with an anti-vibration base, and in addition to an engine mount, there are various types such as a body mount and a differential mount. It can be applied to other vibration isolator. Although not enumerated one by one, various modifications can be made without departing from the spirit of the present invention.

第１の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. 同防振装置の概略構造を示すモデル的に示す説明図Explanatory diagram showing in model form the schematic structure of the vibration isolator 同防振装置の仕切り部を構成する仕切り部本体の平面図The top view of the partition part main body which comprises the partition part of the vibration isolator 同仕切り部の平面図Plan view of the partition 同仕切り部の縦断面図Vertical section of the partition 同実施形態のバルブを示す（ａ）平面図と（ｂ）側面図(A) top view and (b) side view showing the valve of the same embodiment 同仕切り部の要部拡大断面図であり（ａ）は中間室の開放状態、（ｂ）は中間室の閉塞状態It is a principal part expanded sectional view of the partition part, (a) is an open state of an intermediate chamber, (b) is a closed state of an intermediate chamber 第２の実施形態に係る液封入式防振装置の仕切り部の縦断面図The longitudinal cross-sectional view of the partition part of the liquid enclosure type vibration isolator which concerns on 2nd Embodiment 同実施形態のバルブを示す（ａ）平面図と（ｂ）側面図(A) top view and (b) side view showing the valve of the same embodiment 第３の実施形態に係る液封入式防振装置の縦断面図Longitudinal sectional view of a liquid filled type vibration isolator according to the third embodiment 同防振装置の仕切り部を構成する仕切り部本体の平面図The top view of the partition part main body which comprises the partition part of the vibration isolator 同仕切り部の平面図Plan view of the partition

符号の説明Explanation of symbols

１０…液封入式防振装置
１２…第１取付具
１４…第２取付具
１６…防振基体
１８…液室、１８Ａ…主液室、１８Ｂ…第１副液室、１８Ｃ…第２副液室
２０…第１ダイヤフラム
２８…仕切り部
３０…第２ダイヤフラム
３２…仕切り部本体
３８…第１オリフィス流路
４０…第２オリフィス流路
４２…第３オリフィス流路、４２Ａ主流路、４２Ｂ副流路
４４…バルブ、４４Ａ…軸方向一端部
６２…内腔部
７０…嵌合凹部
８０…中間室、８０Ａ…第２オリフィス流路側の区画、８０Ｂ…第３オリフィス流路側の区画
８２…接続流路
８４…遮断壁
８８…凹溝
Ｘ…仕切り部の軸方向
Ｙ…仕切り部の軸直角方向
Ｔ１…バルブの第１の軸直角方向
Ｔ２…バルブの第２の軸直角方向 DESCRIPTION OF SYMBOLS 10 ... Liquid enclosure type vibration isolator 12 ... 1st fixture 14 ... 2nd fixture 16 ... Anti-vibration base | substrate 18 ... Liquid chamber, 18A ... Main liquid chamber, 18B ... 1st sub liquid chamber, 18C ... 2nd sub liquid Chamber 20 ... 1st diaphragm 28 ... Partition 30 ... 2nd diaphragm 32 ... Partition body 38 ... 1st orifice channel 40 ... 2nd orifice channel 42 ... 3rd orifice channel, 42A main channel, 42B subchannel 44 ... Valve, 44A ... Axial end portion 62 ... Lumen 70 ... Fitting recess 80 ... Intermediate chamber, 80A ... Second orifice channel side compartment, 80B ... Third orifice channel side compartment 82 ... Connection channel 84 ... Block wall 88 ... Dove groove X ... Axial direction Y of partition part ... Axis perpendicular direction T1 of partition part ... First axis perpendicular direction T2 of valve ... Second axis perpendicular direction of valve

Claims (5)

振動源側と支持側の一方に取り付けられる第１取付具と、
振動源側と支持側の他方に取り付けられる第２取付具と、
前記第１取付具と第２取付具との間に介設されたゴム状弾性体からなる防振基体と、
前記防振基体が室壁の一部をなす液体が封入された主液室と、
ゴム状弾性膜からなる第１ダイヤフラムが室壁の一部をなす液体が封入された第１副液室と、
ゴム状弾性膜からなる第２ダイヤフラムにより前記主液室から区画形成された液体が封入された第２副液室と、
前記主液室と前記第１副液室を連通させる第１オリフィス流路と、
前記第１オリフィス流路よりも高周波数域にチューニングされて前記主液室と前記第１副液室を連通させる第２オリフィス流路と、
前記第２オリフィス流路よりも高周波数域にチューニングされて前記第１副液室と前記第２副液室を連通させる第３オリフィス流路と、
前記第２オリフィス流路と前記第３オリフィス流路の開放状態と閉塞状態を切り替えるバルブと、
を備え、
前記第３オリフィス流路は、前記第１副液室と前記第２副液室を連通させる主流路と、前記主流路から分岐して設けられて前記第１副液室に接続されかつ前記主流路よりも断面積の小さな副流路とからなり、
前記バルブは、前記第２オリフィス流路が開放状態であり、前記第３オリフィス流路の前記主流路が開放状態かつ前記副流路が閉塞状態である第１の状態と、前記第２オリフィス流路が閉塞状態であり、前記第３オリフィス流路の前記主流路が閉塞状態かつ前記副流路が開放状態である第２の状態とに切替制御される、
液封入式防振装置。 A first fixture attached to one of the vibration source side and the support side;
A second fixture attached to the other of the vibration source side and the support side;
An anti-vibration base made of a rubber-like elastic body interposed between the first fixture and the second fixture;
A main liquid chamber in which a liquid in which the vibration isolating substrate forms a part of a chamber wall is enclosed;
A first sub-liquid chamber in which a liquid in which a first diaphragm made of a rubber-like elastic film forms part of a chamber wall is enclosed;
A second sub-liquid chamber in which the liquid partitioned from the main liquid chamber is sealed by a second diaphragm made of a rubber-like elastic film;
A first orifice channel for communicating the main liquid chamber and the first sub liquid chamber;
A second orifice channel that is tuned to a higher frequency range than the first orifice channel and communicates the main liquid chamber and the first sub-liquid chamber;
A third orifice channel that is tuned to a higher frequency range than the second orifice channel and communicates the first sub-liquid chamber and the second sub-liquid chamber;
A valve that switches between an open state and a closed state of the second orifice channel and the third orifice channel;
With
The third orifice channel is provided with a main channel for communicating the first sub-liquid chamber and the second sub-liquid chamber, a branch from the main channel, connected to the first sub-liquid chamber, and the main stream It consists of a subchannel with a smaller cross-sectional area than the road,
The valve has a first state in which the second orifice channel is open, the main channel of the third orifice channel is open and the sub-channel is closed, and the second orifice channel The path is closed, the main flow path of the third orifice flow path is closed, and the second flow path is open and the second flow path is controlled to be switched.
Liquid-filled vibration isolator. 前記第２取付具が筒状をなし、前記第１ダイヤフラムが前記第２取付具に取り付けられて前記防振基体との間に液体が封入された液室を形成し、前記液室が前記第２取付具の周壁部の内側に嵌着された仕切り部によって前記主液室と前記第１副液室とに仕切られており、前記仕切り部の主液室側部分に前記第２ダイヤフラムにより前記主液室から区画された前記第２副液室が設けられ、前記仕切り部の内部に前記バルブが設けられた、請求項１記載の液封入式防振装置。   The second fixture has a cylindrical shape, and the first diaphragm is attached to the second fixture to form a liquid chamber in which a liquid is sealed between the anti-vibration base, and the liquid chamber is the first chamber. 2 The main liquid chamber and the first sub liquid chamber are partitioned by a partition portion fitted inside the peripheral wall portion of the fixture, and the second diaphragm is provided on the main liquid chamber side portion of the partition portion. The liquid filled type vibration damping device according to claim 1, wherein the second sub liquid chamber partitioned from the main liquid chamber is provided, and the valve is provided inside the partition portion. 前記仕切り部には軸方向に延びて前記第１副液室側に開口する内腔部が設けられ、前記内腔部に回転軸を前記仕切り部の軸直角方向に向けてロータリバルブからなる前記バルブが設けられ、前記内腔部の前記バルブよりも主液室側を中間室として、該中間室に前記第２オリフィス流路及び前記第３オリフィス流路が接続され、前記バルブの回転により前記第１副液室に対する前記中間室の開放状態と閉塞状態とが切り替わるよう構成された、請求項２記載の液封入式防振装置。   The partition portion is provided with a lumen that extends in the axial direction and opens toward the first sub-liquid chamber, and the rotary portion is formed of a rotary valve with a rotation axis in a direction perpendicular to the axis of the partition. A valve is provided, and the second fluid passage and the third orifice passage are connected to the intermediate chamber with the main liquid chamber side from the valve in the lumen portion as an intermediate chamber, The liquid-filled vibration isolator according to claim 2, wherein the liquid-filled vibration isolator is configured to switch between an open state and a closed state of the intermediate chamber with respect to the first sub liquid chamber. 前記中間室に、当該中間室内を前記第２オリフィス流路が接続された側の区画と前記第３オリフィス流路が接続された側の区画とに仕切る遮断壁が設けられた、請求項３記載の液封入式防振装置。   The said intermediate chamber was provided with the interruption | blocking wall which partitions off the said intermediate chamber into the division by the side to which the said 2nd orifice flow path was connected, and the division by which the said 3rd orifice flow path was connected. Liquid-filled vibration isolator. 前記バルブの軸方向一端部が前記内腔部に向けて開かれた嵌合凹部内に回動自在に嵌合保持され、前記バルブは、当該バルブの第１の軸直角方向に貫通して前記中間室を前記第１副液室に対して開放させる接続流路を備えるとともに、前記嵌合凹部内に保持された前記軸方向一端部において前記第１の軸直角方向に垂直な第２の軸直角方向に延びかつ前記嵌合凹部の内面との間で前記第３オリフィス流路の前記副流路を形成する凹溝を備え、前記バルブの回転により前記第３オリフィス流路の前記主流路と前記副流路の開放状態と閉塞状態を交互に切り替え可能に構成された、請求項４記載の液封入式防振装置。   One end portion in the axial direction of the valve is rotatably fitted and held in a fitting recess opened toward the lumen portion, and the valve penetrates in a direction perpendicular to the first axis of the valve. A second axis perpendicular to the direction perpendicular to the first axis at the one axial end held in the fitting recess is provided with a connection channel that opens the intermediate chamber to the first sub-liquid chamber. A concave groove extending in a right angle direction and forming the sub-flow path of the third orifice flow path with the inner surface of the fitting recess, and rotating the valve and the main flow path of the third orifice flow path The liquid-filled type vibration damping device according to claim 4, wherein the liquid-filled type vibration damping device is configured to be able to switch alternately between an open state and a closed state of the sub-channel.

Images