JP6066715B2

JP6066715B2 - Liquid seal vibration isolator

Info

Publication number: JP6066715B2
Application number: JP2012280161A
Authority: JP
Inventors: 行信平野; 佐鳥　和俊; 和俊佐鳥
Original assignee: Yamashita Rubber Co Ltd
Current assignee: Yamashita Rubber Co Ltd
Priority date: 2012-12-21
Filing date: 2012-12-21
Publication date: 2017-01-25
Anticipated expiration: 2032-12-21
Also published as: CN103883667A; CN103883667B; JP2014122685A

Description

この発明は、自動車用エンジンマウント等に使用される液封防振装置に係り、特に、内圧吸収用の弾性仕切部材を利用して共振を発生させることにより動特性を向上させたものに関する。
The present invention relates to a liquid seal vibration isolator used for an engine mount for automobiles and the like, and more particularly, to an apparatus having improved dynamic characteristics by generating resonance using an elastic partition member for absorbing internal pressure.

液室を仕切部材で主液室と副液室に区画し、この仕切部材に設けた第１オリフィスの液柱共振により低周波大振幅振動に対して高減衰とし、仕切部材に設けた弾性仕切部材により高周波小振幅振動を吸収するとともに、弾性仕切部材の周囲に設けた間隙を主液室と副液室に連通させて第２オリフィスとし、この第２オリフィスを弾性仕切部材で開閉するようにしたものがある（特許文献１参照）。 The liquid chamber is divided into a main liquid chamber and a sub liquid chamber by a partition member, and an elastic partition provided in the partition member is provided with high attenuation against low-frequency large-amplitude vibration by liquid column resonance of the first orifice provided in the partition member. The member absorbs high-frequency small-amplitude vibrations, and a gap provided around the elastic partition member communicates with the main liquid chamber and the sub liquid chamber to form a second orifice, and the second orifice is opened and closed by the elastic partition member. (See Patent Document 1).

このような従来例に係る仕切部材の構造例を図１４に示す。主液室１１２と副液室１１３を仕切る仕切部材１１１に第１オリフィス１１４を設け、主液室１１２と副液室１１３を連通して低周波大振幅振動時に液柱共振（第１共振）を発生させて高減衰を実現するようにするとともに、
主液室１１２の内圧変動を吸収するための弾性仕切部材１３０を設け、弾性仕切部材１３０の中央部に設けた受圧部１３１を中央開口１２１により主液室１１２に臨ませ、中央開口１４７により副液室１１３に臨ませてある。 An example of the structure of the partition member according to such a conventional example is shown in FIG. A first orifice 114 is provided in a partition member 111 that partitions the main liquid chamber 112 and the sub liquid chamber 113, and the main liquid chamber 112 and the sub liquid chamber 113 communicate with each other to perform liquid column resonance (first resonance) during low frequency large amplitude vibration. To achieve high attenuation,
An elastic partition member 130 for absorbing the internal pressure fluctuation of the main liquid chamber 112 is provided, and the pressure receiving portion 131 provided at the central portion of the elastic partition member 130 faces the main liquid chamber 112 through the central opening 121, and the sub opening through the central opening 147. It faces the liquid chamber 113.

また、弾性仕切部材１３０に受圧部１３１の周囲を囲む第３液室１３７を設け、この第３液室１３７を第１オリフィス１１４の第１の開口１２４近傍にて短絡通路１７０で連通させ、かつ第３液室１３７の下方を副液室１１３に臨ませ、受圧部１３１の下部に設けたバルブ部１３５で開閉するようにしてある。
このようにすると、第３液室１３７における作動液の流動により液柱共振（第２共振）が発生するので、第３液室１３７を利用した第２オリフィスを形成することができる。
そのうえ、第２オリフィスの主液室１１２側開口として第１の開口１２４を利用するので、第２オリフィス専用に特別の開口を形成する必要がなく、かつ弾性仕切部材１３０の振動を利用してバルブ部１３５を開閉するため、特別なバルブ機構を省略することができる。 The elastic partition member 130 is provided with a third liquid chamber 137 surrounding the pressure receiving portion 131, and the third liquid chamber 137 is communicated with the short-circuit passage 170 in the vicinity of the first opening 124 of the first orifice 114, and The lower part of the third liquid chamber 137 faces the auxiliary liquid chamber 113 and is opened and closed by a valve part 135 provided at the lower part of the pressure receiving part 131.
In this case, liquid column resonance (second resonance) is generated by the flow of the working fluid in the third liquid chamber 137, so that the second orifice using the third liquid chamber 137 can be formed.
In addition, since the first opening 124 is used as the opening of the second orifice on the side of the main liquid chamber 112, it is not necessary to form a special opening exclusively for the second orifice, and the valve utilizing the vibration of the elastic partition member 130 is used. Since the part 135 is opened and closed, a special valve mechanism can be omitted.

特開２０１１−２４１９２６号公報JP 2011-241926 A

ところで、上記構造の場合、第２オリフィスは弾性仕切部材に形成される第３液室１３７を第１オリフィス１１４と短絡する構造であり、しかも第１の開口１２４近傍に短絡させる必要があるため、第２オリフィスの主液室１１２側開口位置を自由に形成することができない。第２オリフィスの長さを変化させれば、第２共振の周波数をコントロールできるが、第２オリフィスの開口位置が決まっているため、このように長さを自由に変化させることは困難である。
さらに、第２オリフィスは第１オリフィス１１４と一部を共通化することにより、第１オリフィス１１４の影響を受けやすくなる。例えば、第１オリフィス１１４の共振周波数よりも第２オリフィスの共振周波数が高い場合、第２オリフィスの共振時には、第１オリフィス１１４は目詰まり状態となって作動液が停滞している。このため、第２オリフィスの作動液は、主液室１１２側の開口部である第１の開口１２４近傍で第１オリフィス１１４の停滞した作動液により流動抵抗を受け、期待通りに作動液が流動せず、本来の目的とするような第２共振を発生することができない場合があるので、第２共振を正確かつ微細にコントロールできるようにすることが求められる。
そこで本願は、このような課題の解決を目的とする。

By the way, in the case of the above structure, the second orifice has a structure in which the third liquid chamber 137 formed in the elastic partition member is short-circuited with the first orifice 114, and it is necessary to short-circuit in the vicinity of the first opening 124. The opening position of the second orifice on the main liquid chamber 112 side cannot be freely formed. If the length of the second orifice is changed, the frequency of the second resonance can be controlled. However, since the opening position of the second orifice is determined, it is difficult to freely change the length in this way.
Furthermore, the second orifice is easily affected by the first orifice 114 by sharing a part with the first orifice 114. For example, when the resonance frequency of the second orifice is higher than the resonance frequency of the first orifice 114, when the second orifice resonates, the first orifice 114 is clogged and the working fluid is stagnant. Therefore, the hydraulic fluid in the second orifice is subjected to flow resistance by the hydraulic fluid stagnated in the first orifice 114 in the vicinity of the first opening 124 that is the opening on the main liquid chamber 112 side, and the hydraulic fluid flows as expected. Therefore, there is a case where the second resonance as originally intended cannot be generated. Therefore, it is required to control the second resonance accurately and finely.
Therefore, the present application aims to solve such problems.

上記課題を解決するため本願の液封防振装置に係る請求項１に記載した発明は、
振動源側へ取付けられる第１の取付部材（１）と、振動被伝達側へ取付けられる第２の取付部材（２）と、これらの間に設けられる弾性本体部（３）を備え、この弾性本体部を壁の一部とする液室を形成し、この液室内を仕切部材（１１）にて主液室（１２）と副液室（１３）とに区画するとともに、これら主液室と副液室間を所定の入力振動で第１共振を生じる第１オリフィス（１４）で連通し、かつ仕切部材の少なくとも一部に主液室の内圧変化を吸収するべく弾性変形する弾性仕切部材（３０）を設け、
前記仕切部材（１１）に前記主液室（１２）と副液室（１３）を連通し、前記第１オリフィス（１４）の第１共振と異なる周波数で第２共振する第２オリフィス（５０）を設け、この第２オリフィス（５０）を前記弾性仕切部材（３０）の一部で開閉するとともに、
前記仕切部材（１１）は、前記第１オリフィス（１４）を外周部に備え、かつその主液室（１２）側の開口である第１の開口（２４）を備え、
前記第２オリフィス（５０）は、前記第１オリフィス（１４）と分離して別に形成され、かつその主液室側開口である第２の開口（２５）が、前記第１の開口（２４）と別に形成されているとともに、
前記仕切部材（１１）は、前記弾性仕切部材（３０）と、この弾性仕切部材（３０）を嵌合する枠部材（４０）と、前記弾性仕切部材（３０）を前記枠部材（４０）へ固定するカバー部材（２０）とを備え、
前記弾性仕切部材（３０）は中央部の受圧部（３１）と、この外周部に設けられる支持バネ部（３２）と、を備え、
前記枠部材（４０）は、外周部にて外周壁（４２）と内周壁（４３）の間に形成される環状溝（４１）と、
内周壁（４３）の内側にて前記弾性仕切部材（３０）の外周部を支持する支持壁（４４）と、
支持壁（４４）の内側に開口して前記副液室（１３）に連通するとともに前記受圧部（３１）にて開閉される中央開口部（４７）を備え、
前記第２オリフィス（５０）は、一端を前記第２の開口（２５）に連通し、他端を前記中央開口部（４７）に連通して、前記内周壁（４３）と受圧部（３１）の間に第３液室（３７）が形成されていることを特徴とする。 In order to solve the above problems, the invention described in claim 1 relating to the liquid seal vibration isolator of the present application is
A first attachment member (1) attached to the vibration source side, a second attachment member (2) attached to the vibration transmitted side, and an elastic main body (3) provided therebetween are provided. A liquid chamber having a body portion as a part of a wall is formed, and the liquid chamber is partitioned into a main liquid chamber (12) and a sub liquid chamber (13) by a partition member (11), and the main liquid chamber An elastic partition member that communicates between the sub-liquid chambers with a first orifice (14) that generates a first resonance with a predetermined input vibration, and that is elastically deformed so as to absorb a change in the internal pressure of the main liquid chamber in at least part of the partition member 30)
A second orifice (50) communicating with the partition member (11) through the main liquid chamber (12) and the sub liquid chamber (13) and resonating at a frequency different from the first resonance of the first orifice (14). And opening and closing the second orifice (50) by a part of the elastic partition member (30),
The partition member (11) includes the first orifice (14) on the outer peripheral portion, and a first opening (24) that is an opening on the main liquid chamber (12) side,
The second orifice (50) is formed separately from the first orifice (14), and the second opening (25), which is the main liquid chamber side opening, is formed in the first opening (24). and with are formed separately,
The partition member (11) includes the elastic partition member (30), a frame member (40) for fitting the elastic partition member (30), and the elastic partition member (30) to the frame member (40). A cover member (20) for fixing,
The elastic partition member (30) includes a central pressure receiving portion (31) and a support spring portion (32) provided on the outer peripheral portion,
The frame member (40) has an annular groove (41) formed between the outer peripheral wall (42) and the inner peripheral wall (43) at the outer peripheral portion;
A support wall (44) that supports the outer peripheral portion of the elastic partition member (30) inside the inner peripheral wall (43);
A central opening (47) that opens to the inside of the support wall (44) and communicates with the auxiliary liquid chamber (13) and that is opened and closed by the pressure receiving portion (31);
The second orifice (50) has one end communicating with the second opening (25) and the other end communicating with the central opening (47), and the inner peripheral wall (43) and the pressure receiving portion (31). A third liquid chamber (37) is formed between the two.

請求項２に記載した発明は、上記請求項１において、
前記弾性仕切部材（３０）には、前記受圧部（３１）の外周を囲むリング状溝（３３）が形成され、このリング状溝（３３）が前記第３液室（３７）を構成することを特徴とする。 The invention described in claim 2, Oite to the claim 1,
The elastic partition member (30) is formed with a ring-shaped groove (33) surrounding the outer periphery of the pressure receiving portion (31), and the ring-shaped groove (33) constitutes the third liquid chamber (37). It is characterized by.

請求項３に記載した発明は、上記請求項２において、
前記受圧部（３１）の外周面全周には、前記リング状溝（３３）に向かって開放された環状凹部（３６）が形成され、この環状凹部（３６）が前記第３液室（３７）の一部をなすことを特徴とする。 The invention described in claim 3 is the above-mentioned claim 2 ,
An annular recess (36) opened toward the ring-shaped groove (33) is formed on the entire outer peripheral surface of the pressure receiving portion (31), and the annular recess (36) is formed in the third liquid chamber (37). ).

請求項４に記載した発明は、上記請求項２又は３において、
前記弾性仕切部材（３０）は、前記受圧部（３１）の周囲に間隔をもって囲む周壁（３４）を一体に備え、
この周壁（３４）と前記受圧部（３１）の間に前記リング状溝（３３）を形成するとともに、周壁（３４）の一部に切り欠き部（３８）を設け、リング状溝（３３）を周壁（３４）の外方空間と連通させたことを特徴とする。 The invention described in claim 4 is the above-described claim 2 or 3 ,
The elastic partition member (30) is integrally provided with a peripheral wall (34) surrounding the pressure receiving portion (31) with a space therebetween,
The ring-shaped groove (33) is formed between the peripheral wall (34) and the pressure-receiving portion (31), and a notch (38) is provided in a part of the peripheral wall (34) to form the ring-shaped groove (33). Is communicated with the outer space of the peripheral wall (34).

請求項５記載した発明は、上記請求項４において、
前記内周壁（４３）の前記切り欠き部（３８）と連続する位置に切り欠き部（４８）を設け、
この切り欠き部（４８）を前記第２の開口（２５）と第３液室（３７）へ連通させたことを特徴とする。 The invention described in claim 5 is the above invention according to claim 4 ,
A notch (48) is provided at a position continuous with the notch (38) of the inner peripheral wall (43);
The notch (48) is communicated with the second opening (25) and the third liquid chamber (37).

請求項１の発明によれば、第１オリフィス（１４）と別の独立した第２オリフィス（５０）を設けるとともに、この第２オリフィス（５０）を第１オリフィス（１４）と分離して別に形成し、かつ主液室（１２）側の開口である第２の開口（２５）を第１の開口（２４）と別に設けたので、第２オリフィス（５０）を第１オリフィス（１４）に影響されずに設けることができ、オリフィス長等を最適にすることができ、第２オリフィス（５０）の形成における自由度が大きくなる。
しかも、第２オリフィス（５０）の開口部を第１オリフィス（１４）の第１の開口（２４）と別にしたので、第１オリフィス（１４）による第１共振の影響を排除できるので、第２共振の周波数コントロールを微細にすることができる。
また、受圧部（３１）と内周壁（４３）の間に第３液室（３７）を形成したので、この第３液室（３７）を利用して第２オリフィス（５０）を容易に形成できる。」
According to the first aspect of the present invention, the second orifice (50) is provided separately from the first orifice (14), and the second orifice (50) is formed separately from the first orifice (14). In addition, since the second opening (25), which is the opening on the main liquid chamber (12) side, is provided separately from the first opening (24), the second orifice (50) affects the first orifice (14). The orifice length can be optimized, and the degree of freedom in forming the second orifice (50) is increased.
In addition, since the opening of the second orifice (50) is separated from the first opening (24) of the first orifice (14), the influence of the first resonance caused by the first orifice (14) can be eliminated. The frequency control of resonance can be made fine.
Further, since the third liquid chamber (37) is formed between the pressure receiving portion (31) and the inner peripheral wall (43), the second orifice (50) can be easily formed using the third liquid chamber (37). it can. "

請求項２の発明によれば、受圧部（３１）の周囲を囲むリング状溝（３３）を設けたので、このリング状溝（３３）を利用して第３液室（３７）を容易に形成できる。 According to the invention of claim 2 , since the ring-shaped groove (33) surrounding the periphery of the pressure receiving portion (31) is provided, the third liquid chamber (37) can be easily formed using the ring-shaped groove (33). Can be formed.

請求項３の発明によれば、受圧部（３１）の外周面に環状凹部（３６）を設けたので、環状凹部（３６）の空間を第３液室（３７）に含めることができ、第３液室（３７）の容量を大きくすることができる。 According to the invention of claim 3 , since the annular recess (36) is provided on the outer peripheral surface of the pressure receiving portion (31), the space of the annular recess (36) can be included in the third liquid chamber (37). The capacity of the three liquid chamber (37) can be increased.

請求項４の発明によれば、リング状溝（３３）の外側を囲む周壁（３４）を設け、この一部に切り欠き部（３８）を設けることにより、切り欠き部（３８）を通してリング状溝（３３）を周壁（３４）の外方空間へ容易に接続できる。 According to the invention of claim 4 , the peripheral wall (34) surrounding the outside of the ring-shaped groove (33) is provided, and the notch (38) is provided in a part of the ring-shaped groove (33), whereby the ring-shaped groove is formed through the notch (38). The groove (33) can be easily connected to the outer space of the peripheral wall (34).

請求項５の発明によれば、内周壁（４３）の一部に切り欠き部（４８）を設け、これを切り欠き部（３８）と接続することにより切り欠き部（４８）による空間を第２の開口（２５）及び第３液室（３７）と連通させることにより、切り欠き部（４８）を第２オリフィス（５０）の一部とすることができ、第２オリフィス（５０）を容易に形成することができる。
According to the invention of claim 5, the notch (48) is provided in a part of the inner peripheral wall (43), and this is connected to the notch (38) to thereby reduce the space by the notch (48). By connecting the two openings (25) and the third liquid chamber (37), the notch (48) can be a part of the second orifice (50), and the second orifice (50) can be easily formed. Can be formed.

第１実施例に係るエンジンマウントの断面図Sectional view of the engine mount according to the first embodiment 第１実施例に係る仕切部材の平面図The top view of the partition member which concerns on 1st Example 図２の３−３線断面図3-3 sectional view of FIG. 第１実施例に係る構成各部を斜視図にした仕切部材の分解斜視図The exploded perspective view of the partition member which made each component part concerning a 1st example a perspective view 第１実施例に係る構成各部を断面にした仕切部材の分解断面図The exploded sectional view of the partition member which made each section the composition concerning the 1st example into a section 第１実施例に係る弾性仕切部材の底面図Bottom view of the elastic partition member according to the first embodiment 第１実施例に係る枠部材の平面図The top view of the frame member concerning the 1st example 第１実施例に係る作用の説明図Explanatory drawing of the effect | action which concerns on 1st Example 本願の動特性グラフDynamic characteristic graph of this application 第２実施例に係る図８のＡと同様部位の断面図Sectional drawing of the site | part similar to A of FIG. 8 which concerns on 2nd Example. 第３実施例に係る同上図Same as above for the third embodiment 第４実施例に係る同上図Same as above for the fourth embodiment 第５実施例に係る同上図Same as above for the fifth embodiment 従来例に係る図３と同様部位の断面図Sectional view of the same portion as FIG. 3 according to the conventional example

以下、図面に基づいて、３気筒エンジンを搭載した自動車のエンジンマウントとして構成された一実施例を説明する。まず、図１〜９により第１実施例を説明する。図１はこのエンジンマウントの中心線ＣＬ（主たる振動の入力方向であるＺ方向と平行）に沿う断面図、図２は仕切部材の平面図、図３は図２の３−３線に沿う断面図、図４は仕切部材の分解斜視図、図５は仕切部材の分解断面図、図６は弾性仕切部材の底面図、図７は枠部材の平面図、図８は作用の説明図、図９は動特性のグラフである。 Hereinafter, an embodiment configured as an engine mount of an automobile equipped with a three-cylinder engine will be described based on the drawings. First, a first embodiment will be described with reference to FIGS. 1 is a cross-sectional view taken along the center line CL (parallel to the Z direction, which is the main vibration input direction), FIG. 2 is a plan view of the partition member, and FIG. 3 is a cross-sectional view taken along the line 3-3 in FIG. 4 is an exploded perspective view of the partition member, FIG. 5 is an exploded sectional view of the partition member, FIG. 6 is a bottom view of the elastic partition member, FIG. 7 is a plan view of the frame member, and FIG. 9 is a graph of dynamic characteristics.

なお、以下の説明において、液封防振装置及びその各部の上下とは図１の図示状態を基準とし、仕切部材については主液室側を上、副液室側を下とする。
また、本願において低周波数域とは１５Ｈｚ未満の領域をいい、これより周波数の高い１５〜５０Ｈｚ程度の領域を中周波数域、５０Ｈｚより高い周波数域を高周波数域というものとする。この低周波数域において、５Ｈｚ近傍の領域を走行時にサスペンションから入る振動域とし、中周波数域において１５Ｈｚ近傍をアイドル振動域とする。 In the following description, the liquid seal vibration isolator and the upper and lower portions thereof are based on the state shown in FIG. 1, and the partition member has the main liquid chamber side up and the sub liquid chamber side down.
Moreover, in this application, a low frequency area means the area | region below 15 Hz, and let the area | region of about 15-50 Hz whose frequency is higher than this be a middle frequency area, and let a frequency area higher than 50 Hz be a high frequency area. In this low frequency region, a region near 5 Hz is a vibration region that enters from the suspension during traveling, and a region near 15 Hz is an idle vibration region in the medium frequency region.

さらに、入力振動の振幅が±０．１ｍｍ以下を小振幅、±０．１ｍｍ超〜±１．０ｍｍ未満程度を中振幅、±１．０ｍｍ以上〜±２．０ｍｍ以下程度を大振幅、±２．０ｍｍを超えるものを過大振幅ということにする。但し、周波数域の周波数区分及び振幅の大小区分は、エンジンの仕様等により定まる便宜的なものであって、使用対象のエンジンや車両毎に適宜定められる。 Further, the amplitude of the input vibration is ± 0.1 mm or less, small amplitude, more than ± 0.1 mm to less than ± 1.0 mm, medium amplitude, ± 1.0 mm to ± 2.0 mm or less, large amplitude, ± 2 Those exceeding 0.0 mm are called excessive amplitude. However, the frequency division of the frequency range and the magnitude division of the amplitude are for convenience determined by the engine specifications and the like, and are appropriately determined for each engine or vehicle to be used.

また、エンジンマウントへ荷重が加わり主液室を加圧する振動を正圧側の振動もしくはプラス（＋）振動、逆方向の振動を負圧側の振動もしくはマイナス（−）振動ということにする。 Further, the vibration that applies a load to the engine mount and pressurizes the main liquid chamber is referred to as positive pressure vibration or positive (+) vibration, and the reverse vibration is referred to as negative pressure vibration or negative (−) vibration.

図１において、このエンジンマウントは振動発生源側であるエンジン側へ取付けられる第１の取付部材１と、振動被伝達側である車体側へ取付けられる第２の取付部材２と、これらを連結して一体的に設けられる弾性本体部３を備える。弾性本体部３は公知のゴム等からなる適宜弾性材料から構成される略円錐状の部材であり、この円錐状部４の頂部に第１の取付部材１が埋設一体化されている。 In FIG. 1, this engine mount is connected to a first attachment member 1 attached to the engine side which is the vibration generation source side, and a second attachment member 2 attached to the vehicle body side which is the vibration transmission side. And an elastic main body 3 provided integrally therewith. The elastic main body 3 is a substantially conical member made of an appropriate elastic material made of a known rubber or the like, and the first mounting member 1 is embedded and integrated at the top of the conical portion 4.

円錐状部４の内側表面５は後述する液室に臨む内壁面をなす。円錐状部４の裾部周囲はフランジ６をなし、このフランジ６から下方部分はさらに下方へ延びて内張部７をなしている。フランジ６は第２の取付部材２の一部を構成して円筒状をなす側壁部８のフランジ９上へ一体化され、かつ内張部７は側壁部８の内面を覆っている。 The inner surface 5 of the conical portion 4 forms an inner wall surface facing a liquid chamber described later. The periphery of the bottom of the conical portion 4 forms a flange 6, and the lower portion extends further downward from the flange 6 to form a lining 7. The flange 6 constitutes a part of the second mounting member 2 and is integrated on the flange 9 of the cylindrical side wall portion 8, and the lining portion 7 covers the inner surface of the side wall portion 8.

弾性本体部３の内側は下方へ開放された空間をなし、この開放部はダイアフラム１０で覆われ、これらによって内側に液室を形成する。この液室内は仕切部材１１により弾性本体部３側の主液室１２とダイアフラム１０側の副液室１３に区画され、両液室は仕切部材１１の外周部に形成された、低周波大振幅振動を吸収するための第１オリフィス１４によって連通される。液室内には水等公知の非圧縮性作動液が充填されている。 The inside of the elastic main body 3 forms a space opened downward, and this open part is covered with a diaphragm 10, thereby forming a liquid chamber inside. This liquid chamber is partitioned by a partition member 11 into a main liquid chamber 12 on the elastic main body 3 side and a sub liquid chamber 13 on the diaphragm 10 side, and both liquid chambers are formed on the outer periphery of the partition member 11 and have a low frequency and large amplitude. Communicated by a first orifice 14 for absorbing vibration. The liquid chamber is filled with a known incompressible hydraulic fluid such as water.

第１オリフィス１４は入力振動が所定の低周波数（例えば、約１５Ｈｚ程度）のとき液柱共振（第１共振）を生じるようにチューニングされている。
主たる振動の入力方向Ｚは、第１の取付部材１からその軸心線であってエンジンマウントの中心線ＣＬと平行に主液室１２内へ向かい、仕切部材１１の主液室１２に臨む表面と略直交している。 The first orifice 14 is tuned to generate a liquid column resonance (first resonance) when the input vibration has a predetermined low frequency (for example, about 15 Hz).
The main vibration input direction Z is the surface of the partition member 11 facing the main liquid chamber 12 from the first mounting member 1 toward the main liquid chamber 12, which is the axial center line of the first mounting member 1 and parallel to the center line CL of the engine mount. It is almost orthogonal.

以下、仕切部材１１の詳細構造を説明する。
図２〜５に示すように、仕切部材１１は、カバー部材２０と、ゴム等の適宜弾性材料からなる弾性仕切部材３０と、これを支持する略カップ状の枠部材４０との３部材で構成されている。すなわち、枠部材４０に弾性仕切部材３０を上方から嵌合し、さらにその上にカバー部材２０を被せ、ビス等の結合部材２９（図２）でカバー部材２０と枠部材４０を締結等で結合することにより、３部材が一体化された仕切部材１１が構成されている。 Hereinafter, the detailed structure of the partition member 11 will be described.
As shown in FIGS. 2 to 5, the partition member 11 includes three members: a cover member 20, an elastic partition member 30 made of an appropriate elastic material such as rubber, and a substantially cup-shaped frame member 40 that supports the partition member 11. Has been. That is, the elastic partition member 30 is fitted to the frame member 40 from above, and the cover member 20 is further covered thereon, and the cover member 20 and the frame member 40 are coupled by fastening or the like with a coupling member 29 (FIG. 2) such as a screw. By doing so, the partition member 11 in which the three members are integrated is configured.

なお、図４はカバー部材２０、弾性仕切部材３０及び枠部材４０を分解してそれぞれを斜視図で示したものであり、図中のＡＢＣが、カバー部材２０、弾性仕切部材３０及び枠部材４０をそれぞれ斜め下方から示す斜視図であり、Ｄは枠部材４０を斜め上方から示す斜視図である。 4 is an exploded perspective view of the cover member 20, the elastic partition member 30, and the frame member 40. ABC in the figure is the cover member 20, the elastic partition member 30, and the frame member 40. Is a perspective view showing the frame member 40 obliquely from below, and D is a perspective view showing the frame member 40 obliquely from above.

カバー部材２０は弾性仕切部材３０上に被せられ、枠部材４０の開口部を覆う蓋として機能する。
カバー部材２０の中央部にはカバー部材の中央開口部２１が形成され、その周囲は段部２２となっている。段部２２はその外周側部分である外周部２３（図３参照）より一段低くなっている。段部２２と外周部２３は同心のリング状をなして内外に配置され、カバー部材２０の径方向にて、段部２２が外周部２３の内側に位置している。 The cover member 20 is placed on the elastic partition member 30 and functions as a lid that covers the opening of the frame member 40.
A central opening 21 of the cover member is formed in the central portion of the cover member 20, and the periphery thereof is a stepped portion 22. The step portion 22 is one step lower than the outer peripheral portion 23 (see FIG. 3) which is the outer peripheral side portion. The step portion 22 and the outer peripheral portion 23 are arranged inside and outside in a concentric ring shape, and the step portion 22 is located inside the outer peripheral portion 23 in the radial direction of the cover member 20.

外周部２３には第１オリフィス１４における主液室１２側の開口である第１の開口２４が設けられている。また、この第１の開口２４近傍かつその内側となる段部２２に第２の開口２５が設けられている。第２の開口２５は後述する第２オリフィス５０における主液室１２側の開口をなしている。第２オリフィス５０は、アイドル振動の周波数（例えば、約２０Ｈｚ程度）にて第２共振するようにチューニングされている。 The outer peripheral portion 23 is provided with a first opening 24 that is an opening on the main liquid chamber 12 side in the first orifice 14. Further, a second opening 25 is provided in the step portion 22 near and inside the first opening 24. The second opening 25 is an opening on the main liquid chamber 12 side in a second orifice 50 described later. The second orifice 50 is tuned to resonate at a frequency of idle vibration (for example, about 20 Hz).

図２〜５に示すように、弾性仕切部材３０はゴム等の適宜弾性部材からなる平面視円形で仕切部材１１の中心線ＣＬ方向における厚みに近い比較的厚肉のブロック状をなす部材である。この弾性仕切部材３０の中央部は、主液室１２の液圧を受ける受圧部３１をなし、その周囲部分は薄肉の支持バネ部３２をなす。 As shown in FIGS. 2 to 5, the elastic partition member 30 is a member having a relatively thick block shape close to the thickness in the direction of the center line CL of the partition member 11 in a circular shape in plan view made of an appropriate elastic member such as rubber. . The central part of the elastic partition member 30 forms a pressure receiving part 31 that receives the hydraulic pressure of the main liquid chamber 12, and the surrounding part forms a thin support spring part 32.

受圧部３１はカバー部材２０の中央開口部２１を通して主液室１２に臨み、弾性本体部３の弾性変形に伴う主液室１２の内圧変化を受けて、支持バネ部３２を弾性変形させることによりこの内圧変化を吸収するための部分であり、十分な肉厚を有し、想定される大振幅振動以下の振動入力では容易に弾性変形しない程度の高剛性になっている。
受圧部３１の上面は略平坦面状をなし、下面側は周囲をバルブ部３５に囲まれて上方へ凸に凹入した凹部をなしている。 The pressure receiving portion 31 faces the main liquid chamber 12 through the central opening 21 of the cover member 20, receives the change in the internal pressure of the main liquid chamber 12 accompanying the elastic deformation of the elastic main body portion 3, and elastically deforms the support spring portion 32. It is a part for absorbing this change in internal pressure, has a sufficient thickness, and has a high rigidity that does not easily elastically deform when vibration input is less than the assumed large amplitude vibration.
The upper surface of the pressure receiving portion 31 has a substantially flat surface shape, and the lower surface side has a concave portion that is surrounded by the valve portion 35 and protrudes upward.

支持バネ部３２は、受圧部３１の周囲を下面側から彫り込んでリング状溝３３を形成することによりその残肉部として形成され、薄肉で容易に弾性変形するようになっており、受圧部３１が主液室１２の液圧変化に応じて上下動することを許容し、かつ受圧部３１が上下動するとき所定のバネにより弾性変形して主液室１２の液圧変化を吸収できる。支持バネ部３２と受圧部３１の上面はほぼ面一になっている。 The support spring portion 32 is formed as a remaining portion by carving the periphery of the pressure receiving portion 31 from the lower surface side to form a ring-shaped groove 33, and is thin and easily elastically deformed. Is allowed to move up and down according to a change in the liquid pressure in the main liquid chamber 12 and can be elastically deformed by a predetermined spring when the pressure receiving portion 31 moves up and down to absorb the change in the liquid pressure in the main liquid chamber 12. The upper surfaces of the support spring part 32 and the pressure receiving part 31 are substantially flush.

リング状溝３３は、受圧部３１の周囲を環状に囲みかつ下方へ開放された溝である。このリング状溝３３を挟んで外周側に周壁３４が設けられている。周壁３４は支持バネ部３２の外周部から連続して下方へ延び、リング状溝３３の周囲を囲む環状壁をなすとともに、枠部材４０に対する弾性仕切部材３０の固定部をなしている。
なお、周壁３４の上端部は支持バネ部３２の上端部よりも上方へ突出しており、支持バネ部３２及び受圧部３１は一段低くなって、主液室１２へ臨んでいる。 The ring-shaped groove 33 is a groove that surrounds the pressure receiving portion 31 in an annular shape and is opened downward. A peripheral wall 34 is provided on the outer peripheral side across the ring-shaped groove 33. The peripheral wall 34 continuously extends downward from the outer peripheral portion of the support spring portion 32, forms an annular wall surrounding the ring-shaped groove 33, and serves as a fixing portion of the elastic partition member 30 with respect to the frame member 40.
The upper end portion of the peripheral wall 34 protrudes upward from the upper end portion of the support spring portion 32, and the support spring portion 32 and the pressure receiving portion 31 are lowered by one step and face the main liquid chamber 12.

図３〜５に示すように、受圧部３１の下部外周でリング状溝３３に臨む部分はバルブ部３５をなしている。バルブ部３５は、受圧部３１が下方へ移動して、その下面３５ａが枠部材４０の底部４６におけるバルブシート部４６ａへ密接することにより、枠部材４０の底部４６中央に形成されている中央開口部４７と第３液室３７との連通部を閉じるようになっている（以下、単に中央開口部４７を閉じるという）。 As shown in FIGS. 3 to 5, a portion facing the ring-shaped groove 33 on the lower outer periphery of the pressure receiving portion 31 forms a valve portion 35. The valve portion 35 has a central opening formed at the center of the bottom portion 46 of the frame member 40 when the pressure receiving portion 31 moves downward and its lower surface 35a comes into close contact with the valve seat portion 46a at the bottom portion 46 of the frame member 40. The communication part between the part 47 and the third liquid chamber 37 is closed (hereinafter simply referred to as closing the central opening 47).

また、バルブ部３５の下面３５ａが底部４６のバルブシート部４６ａから離れると、バルブ部３５が中央開口部４７と第３液室３７との連通部を開く（以下、単に中央開口部４７を開くという）状態になる。バルブシート部４６ａは下面３５ａの押し当て部をなし、下面３５ａは略水平の平坦面になっている。
なお、中央開口部４７の開閉は、後述する第２オリフィスの開閉でもある。 Further, when the lower surface 35a of the valve portion 35 is separated from the valve seat portion 46a of the bottom portion 46, the valve portion 35 opens the communication portion between the central opening 47 and the third liquid chamber 37 (hereinafter simply opening the central opening 47). State). The valve seat portion 46a serves as a pressing portion for the lower surface 35a, and the lower surface 35a is a substantially horizontal flat surface.
The opening / closing of the central opening 47 is also an opening / closing of a second orifice described later.

バルブ部３５は、過大振幅振動を含む大振幅振動以上の振動入力時に中央開口部４７を閉じ、小振幅振動及び中振幅振動では中央開口部４７を開いた状態に維持するように設定されている。具体的には、振動が入力しない中立状態におけるバルブ部３５の下面３５ａと底部４６のバルブシート部４６ａとの間隙を、例えば、１．６ｍｍ程度とし、サスペンション振動のような±１．０ｍｍ以上の大振幅振動が入力したとき閉じ、アイドル振動や一般走行中における振動のような、±０．１ｍｍ以下程度の小振幅振動が入力したときは、ある程度の間隙を維持して開いているように設定する。 The valve unit 35 is set to close the central opening 47 when a vibration greater than a large amplitude vibration including an excessive amplitude vibration is input, and to keep the central opening 47 open in a small amplitude vibration and a medium amplitude vibration. . Specifically, the gap between the lower surface 35a of the valve portion 35 and the valve seat portion 46a of the bottom portion 46 in a neutral state where no vibration is input is, for example, about 1.6 mm, and is ± 1.0 mm or more as in suspension vibration. Closes when a large amplitude vibration is input, and is set to be open with a certain gap when a small amplitude vibration of about ± 0.1 mm or less is input, such as idle vibration or vibration during general running To do.

リング状溝３３に臨む受圧部３１の下部外周部はバルブ部３５をなし、受圧部３１の外周面３１ａは、周壁３４を支持するための支持壁４４と平行する垂直面になっている。 The lower outer peripheral portion of the pressure receiving portion 31 facing the ring-shaped groove 33 forms a valve portion 35, and the outer peripheral surface 31 a of the pressure receiving portion 31 is a vertical surface parallel to the support wall 44 for supporting the peripheral wall 34.

リング状溝３３により、受圧部３１の周囲全周を囲む環状空間からなる第３液室３７が形成されている。
この第３液室３７は、主液室１２及び副液室１３を第１及び第２の液室としたとき、これらに続く３番目の液室を意味する。
第３液室３７には作動液が満たされ、バルブ部３５が中央開口部４７を開閉することにより、副液室１３と連通又は遮断される。 The ring-shaped groove 33 forms a third liquid chamber 37 formed of an annular space surrounding the entire circumference of the pressure receiving portion 31.
The third liquid chamber 37 means a third liquid chamber following the first liquid chamber 12 and the sub liquid chamber 13 as the first and second liquid chambers.
The third liquid chamber 37 is filled with hydraulic fluid, and the valve portion 35 opens or closes the central opening 47 to communicate with or shut off the sub liquid chamber 13.

弾性仕切部材３０の底面図である図６に示すように、周壁３４は周方向の一部が切り欠かれており、この切り欠き部３８にてリング状溝３３が周壁３４の径方向外側における切り欠き空間４８ａ（詳細後述）と連通しているため、切り欠き空間４８ａと第３液室３７が連通している。また、切り欠き部３８と反対側における周壁３４の外周部には回り止め用の位置決め突起３９が一体に形成されている。 As shown in FIG. 6, which is a bottom view of the elastic partition member 30, the circumferential wall 34 is partially cut away in the circumferential direction, and the ring-shaped groove 33 is formed on the radially outer side of the circumferential wall 34 by the cutout portion 38. Since the notch space 48a (described later in detail) communicates, the notch space 48a and the third liquid chamber 37 communicate with each other. A positioning projection 39 for preventing rotation is integrally formed on the outer peripheral portion of the peripheral wall 34 on the side opposite to the notch 38.

図３に示すように、切り欠き空間４８ａは第２の開口２５を介して主液室１２と連通し、切り欠き空間４８ａの内部には作動液が満たされている。したがって、バルブ部３５が底部４６から離れた中央開口部４７を開いた状態では、切り欠き空間４８ａが中央開口部４７を介して副液室１３と連通するため、主液室１２の作動液は、第２の開口２５、切り欠き空間４８ａ、第３液室３７、中央開口部４７を介して副液室１３との間を矢示する流線のように流動する。 As shown in FIG. 3, the notch space 48a communicates with the main liquid chamber 12 through the second opening 25, and the inside of the notch space 48a is filled with hydraulic fluid. Therefore, in the state where the valve opening 35 opens the central opening 47 away from the bottom 46, the notch space 48 a communicates with the auxiliary liquid chamber 13 through the central opening 47, so that the hydraulic fluid in the main liquid chamber 12 is The fluid flows like a streamline between the second opening 25, the notch space 48 a, the third liquid chamber 37, and the central opening 47 and the sub liquid chamber 13.

この第２の開口２５−切り欠き空間４８ａ−第３液室３７−中央開口部４７からなる作動液の流動経路が第２オリフィス５０を構成し、この第２オリフィス５０を流れる作動液により所定の周波数にて液柱共振を発生する。これを第１オリフィス１４による第１共振に対して第２共振ということにする。なお、図中における第２オリフィス５０は便宜的に流線にて指示するものとする（他の図も同様）。 The flow path of the hydraulic fluid including the second opening 25, the notch space 48a, the third liquid chamber 37, and the central opening 47 constitutes the second orifice 50, and the hydraulic fluid flowing through the second orifice 50 has a predetermined flow. A liquid column resonance is generated at a frequency. This is referred to as a second resonance with respect to the first resonance caused by the first orifice 14. In addition, the 2nd orifice 50 in a figure shall indicate with a streamline for convenience (other figures are also the same).

第２共振の共振周波数は、第２オリフィス５０の通路断面積や長さにより自由に設定でき、本実施形態ではアイドル振動の周波数に設定されている。
第２オリフィス５０がアイドル振動の周波数にて第２共振することにより、アイドル振動の伝達を減少させるようになっている。この意味において第２オリフィス５０はアイドルオリフィスでもある。 The resonance frequency of the second resonance can be freely set according to the passage cross-sectional area and length of the second orifice 50, and is set to the frequency of idle vibration in this embodiment.
The second orifice 50 resonates at the idling vibration frequency to reduce the transmission of idling vibration. In this sense, the second orifice 50 is also an idle orifice.

図３〜５及び７等に示すように、枠部材４０は、軽合金等の金属や樹脂等の適宜剛性材料で構成され、外周部に上向きに開放された環状溝４１が外周壁４２とこれに対向する内周壁４３の間に形成され、カバー部材２０とともに第１オリフィス１４を構成する。
内周壁４３の内側には間隔をもって環状の支持壁４４が形成され、この支持壁４４と内周壁４３との間に上方に開放された支持溝４５が環状に形成されている。 As shown in FIGS. 3 to 5 and 7, the frame member 40 is made of a suitably rigid material such as a metal such as a light alloy or a resin, and an annular groove 41 opened upward at the outer peripheral portion is provided with the outer peripheral wall 42 and this. The first orifice 14 is formed with the cover member 20.
An annular support wall 44 is formed inside the inner peripheral wall 43 with an interval, and a support groove 45 opened upward is formed between the support wall 44 and the inner peripheral wall 43 in an annular shape.

支持溝４５には周壁３４が嵌合されるようになっており、支持溝４５の深さは周壁３４の高さ（外周部における軸方向寸法）よりも若干浅くなっている。
支持壁４４の上端は、ほぼ支持バネ部３２の厚さ程度だけ内周壁４３の上端部内周側に形成された段部４３ａよりも低くなっている。段部４３ａは内周壁４３の内側に連続して形成される比較的幅広の部分である。 A peripheral wall 34 is fitted into the support groove 45, and the depth of the support groove 45 is slightly shallower than the height of the peripheral wall 34 (the axial dimension at the outer peripheral portion).
The upper end of the support wall 44 is lower than the stepped portion 43 a formed on the inner peripheral side of the upper end portion of the inner peripheral wall 43 by about the thickness of the support spring portion 32. The stepped portion 43 a is a relatively wide portion formed continuously inside the inner peripheral wall 43.

支持壁４４より内側は底部４６をなし、外周側より一段低く形成され、中央部には枠部材側の中央開口部４７が設けられている。底部４６の上面で中央開口部４７の周囲部分はバルブシート部４６ａをなす。
バルブシート部４６ａはバルブ部３５の下面３５ａが押し当てられる被押し当て面であり、略平坦な面として形成され、略垂直方向（Ｚ方向と平行）からバルブ部３５の下面３５ａが押し当てられる。 The inner side of the support wall 44 forms a bottom 46 and is formed one step lower than the outer peripheral side, and a central opening 47 on the frame member side is provided at the center. A peripheral portion of the central opening 47 on the upper surface of the bottom portion 46 forms a valve seat portion 46a.
The valve seat portion 46a is a pressed surface against which the lower surface 35a of the valve portion 35 is pressed, is formed as a substantially flat surface, and the lower surface 35a of the valve portion 35 is pressed from a substantially vertical direction (parallel to the Z direction). .

図７に示すように、支持壁４４と段部４３ａは周方向にて一部が切り欠かれ、この切り欠き部４８によって形成される切り欠き空間４８ａが支持壁４４の内周側と連通する。切り欠き空間４８ａの底部は枠部材４０の底部４６である。
切り欠き部４８の略反対側となる支持溝４５に臨む段部４３ａの内周壁には位置決め溝４９が形成されている。この位置決め溝４９は支持溝４５から段部４３ａの肉厚内へ彫り込まれるように形成され、上方及び支持溝４５内へ開放されている。 As shown in FIG. 7, the support wall 44 and the stepped portion 43 a are partially cut away in the circumferential direction, and the cutout space 48 a formed by the cutout portion 48 communicates with the inner peripheral side of the support wall 44. . The bottom of the cutout space 48 a is the bottom 46 of the frame member 40.
A positioning groove 49 is formed on the inner peripheral wall of the stepped portion 43a facing the support groove 45 on the substantially opposite side of the notch 48. The positioning groove 49 is formed so as to be carved into the thickness of the stepped portion 43 a from the support groove 45, and is opened upward and into the support groove 45.

位置決め溝４９には、弾性仕切部材３０の位置決め突起３９（図６）が嵌合することにより、弾性仕切部材３０が枠部材４０に対して回り止めされる。 When the positioning protrusions 39 (FIG. 6) of the elastic partition member 30 are fitted into the positioning groove 49, the elastic partition member 30 is prevented from rotating with respect to the frame member 40.

環状溝４１は全周に形成されず、周方向両端部は外周壁４２と内周壁４３間を部分的につなぐ連結部４０ａにて分離されている。連結部４０ａを挟む環状溝４１の周方向両端部のうち、一方の端部は副液室側の開口４１ａを介して副液室１３と連通している。副液室側の開口４１ａは図４に示すように、環状溝４１の底部から、その内側に形成される枠部材４０の底部４６にかけて、径方向内側へ入り込むように形成されている。 The annular groove 41 is not formed on the entire circumference, and both end portions in the circumferential direction are separated by a connecting portion 40 a that partially connects the outer peripheral wall 42 and the inner peripheral wall 43. One of the circumferential ends of the annular groove 41 sandwiching the connecting portion 40a communicates with the auxiliary liquid chamber 13 through the opening 41a on the auxiliary liquid chamber side. As shown in FIG. 4, the sub liquid chamber side opening 41 a is formed so as to enter the radially inner side from the bottom of the annular groove 41 to the bottom 46 of the frame member 40 formed inside thereof.

この仕切部材１１を組立てるには、図４及び５に示すように、弾性仕切部材３０を枠部材４０の上に乗せ、周壁３４を支持溝４５へ嵌合し、さらに弾性仕切部材３０の上にカバー部材２０を被せ、結合部材２９（図２）でカバー部材２０を枠部材４０へ結合する。これにより、図２及び３に示すように、これらの３部材が一体化された仕切部材１１が組立てられる。 4 and 5, the partition member 11 is assembled by placing the elastic partition member 30 on the frame member 40, fitting the peripheral wall 34 into the support groove 45, and further on the elastic partition member 30. The cover member 20 is covered, and the cover member 20 is coupled to the frame member 40 by the coupling member 29 (FIG. 2). Thereby, as shown in FIGS. 2 and 3, the partition member 11 in which these three members are integrated is assembled.

この組立状態では、図３に示すように、カバー部材２０の外周部２３が外周壁４２と内周壁４３の上端面に重なり、カバー部材２０の段部２２が内周壁４３の上部内周側に嵌合し、枠部材４０の段部４３ａに重なる。 In this assembled state, as shown in FIG. 3, the outer peripheral portion 23 of the cover member 20 overlaps the upper end surfaces of the outer peripheral wall 42 and the inner peripheral wall 43, and the step portion 22 of the cover member 20 faces the upper inner peripheral side of the inner peripheral wall 43. It fits and overlaps the step 43a of the frame member 40.

また、環状溝４１は上方をカバー部材２０の外周部２３で閉じられて第１オリフィス１４を形成する。環状溝４１の周方向一端部に第１の開口２４が重なり、他端部には他方の開口４１ａ（図４参照）が設けられているため、この第１オリフィス１４は、第１の開口２４で主液室１２と連通し、他方の開口４１ａで副液室１３と連通している。 Further, the annular groove 41 is closed at the upper part by the outer peripheral portion 23 of the cover member 20 to form the first orifice 14. Since the first opening 24 overlaps one end in the circumferential direction of the annular groove 41 and the other opening 41a (see FIG. 4) is provided at the other end, the first orifice 14 is provided with the first opening 24. Communicates with the main liquid chamber 12 and communicates with the auxiliary liquid chamber 13 through the other opening 41a.

受圧部３１はカバー部材２０の中央開口部２１で主液室１２へ臨み、枠部材４０の中央開口部４７で副液室１３へ臨んでいる。
バルブ部３５は支持壁４４の内周側に位置し、下面３５ａがバルブシート部４６ａから離れて中央開口部４７を開いている。 The pressure receiving portion 31 faces the main liquid chamber 12 through the central opening 21 of the cover member 20 and faces the sub liquid chamber 13 through the central opening 47 of the frame member 40.
The valve portion 35 is located on the inner peripheral side of the support wall 44, and the lower surface 35 a is separated from the valve seat portion 46 a and opens the central opening 47.

さらに、位置決め突起３９が位置決め溝４９へ嵌合することにより、枠部材４０に対して位置決めされた弾性仕切部材３０は、その切り欠き部３８が枠部材４０の切り欠き部４８に接続することによって、第３液室３７が切り欠き空間４８ａと連通し、第２オリフィス５０を形成する。この状態で第２オリフィス５０は第２の開口２５を介して主液室１２へ連通し、バルブ部３５とバルブシート部４６ａとの間隙を通して副液室１３へ連通している。 Further, when the positioning projection 39 is fitted into the positioning groove 49, the elastic partition member 30 positioned with respect to the frame member 40 is connected by the notch 38 to the notch 48 of the frame member 40. The third liquid chamber 37 communicates with the notch space 48a to form the second orifice 50. In this state, the second orifice 50 communicates with the main liquid chamber 12 through the second opening 25 and communicates with the sub liquid chamber 13 through the gap between the valve portion 35 and the valve seat portion 46a.

なお、支持溝４５へ嵌合されている弾性仕切部材３０の周壁３４は、上端をカバー部材２０の段部２２で押さえられることにより固定され、支持バネ部３２は支持壁４４の上端部で支持される。
このとき、周壁３４の高さ寸法を支持溝４５の深さよりも若干大きくして締め代を設けてあるため、カバー部材２０の取付けにより周壁３４を圧縮する。この圧縮量は周壁３４の高さと支持溝４５の深さを調整することにより変化させて締め代調整できる。同時に支持バネ部３２の支持壁４４による支持の強さを調整して支持バネ部３２のバネを調整できる。 The peripheral wall 34 of the elastic partition member 30 fitted into the support groove 45 is fixed by pressing the upper end thereof by the step portion 22 of the cover member 20, and the support spring portion 32 is supported by the upper end portion of the support wall 44. Is done.
At this time, since the height dimension of the peripheral wall 34 is slightly larger than the depth of the support groove 45 and a fastening margin is provided, the peripheral wall 34 is compressed by attaching the cover member 20. The amount of compression can be adjusted by adjusting the height of the peripheral wall 34 and the depth of the support groove 45 to adjust the tightening allowance. At the same time, the strength of the support spring 44 by the support wall 44 can be adjusted to adjust the spring of the support spring 32.

次に、図８により本実施例の作用を説明する。図８は図３の断面において、左側のバルブ部３５及びその周囲部分を拡大して示す断面図であり、Ａは中立位置、Ｂは大振幅以上のプラス振動入力時における中央開口部４７が閉じられた状態をそれぞれ示す。 Next, the operation of this embodiment will be described with reference to FIG. FIG. 8 is an enlarged cross-sectional view of the left valve portion 35 and its peripheral portion in the cross section of FIG. 3, where A is a neutral position and B is closed at the central opening 47 when a positive vibration having a large amplitude or more is input. Each state is shown.

まず、バルブ部３５が図８のＡに示す中立位置にある状態において、第１の取付部材１から低周波大振幅振動が入力すると、プラス振動のとき、受圧部３１が大きな内圧で下方へ押されるため、支持バネ部３２を弾性変形させて下方へ移動し、図８のＢに示すように、バルブ部３５の下面３５ａが底部４６のバルブシート部４６ａへ押しつけられて、中央開口部４７を閉じる。 First, in the state where the valve portion 35 is in the neutral position shown in FIG. 8A, when low frequency large amplitude vibration is input from the first mounting member 1, the pressure receiving portion 31 is pushed downward with a large internal pressure during positive vibration. Therefore, the support spring portion 32 is elastically deformed and moved downward, and the lower surface 35a of the valve portion 35 is pressed against the valve seat portion 46a of the bottom portion 46 as shown in FIG. close up.

この状態では、第２オリフィス５０が中央開口部４７において副液室１３側を閉じられるため、第２オリフィス５０における作動液の流動は生じない。また、受圧部３１は底部４６側へ押しつけられたままとなる。
このため、作動液は第１オリフィス１４を流れて第１共振を発生させる。この第１共振により動特性は高減衰になり、低周波大振幅振動を吸収する。 In this state, the second orifice 50 is closed on the side of the secondary liquid chamber 13 at the central opening 47, so that the hydraulic fluid does not flow through the second orifice 50. Further, the pressure receiving portion 31 remains pressed toward the bottom 46 side.
For this reason, the hydraulic fluid flows through the first orifice 14 to generate the first resonance. Due to the first resonance, the dynamic characteristic is highly attenuated and absorbs the low frequency large amplitude vibration.

なお、マイナス振動では、受圧部３１が主液室１２側すなわち図の上方へ移動し、図８のＡに示す状態に戻り、中央開口部４７が開くため、作動液は副液室１３から第２オリフィス５０を通って主液室１２へ移動する。 In the negative vibration, the pressure receiving portion 31 moves to the main liquid chamber 12 side, that is, upward in the figure, returns to the state shown in FIG. 8A, and the central opening 47 is opened. It moves to the main liquid chamber 12 through the two orifices 50.

しかし、第２オリフィス５０のチューニング周波数（第２共振周波数）は、第１共振周波数よりも高いため、第２オリフィス５０において液柱共振を発生せずに、速やかに副液室１３から主液室１２へ流れる。
また、第１オリフィス１４は、第２オリフィス５０よりも流動抵抗が大きくなるため、第１オリフィス１４へも作動液が流動せず、第１オリフィス１４における液柱共振も発生しない。 However, since the tuning frequency (second resonance frequency) of the second orifice 50 is higher than the first resonance frequency, liquid column resonance does not occur in the second orifice 50, and the main liquid chamber 13 can be promptly moved from the sub liquid chamber 13. It flows to 12.
Further, since the flow resistance of the first orifice 14 is larger than that of the second orifice 50, the working fluid does not flow to the first orifice 14, and no liquid column resonance occurs in the first orifice 14.

その後、入力振動が周波数の高いアイドル振動になると、中周波中振幅もしくは小振幅振動のため、受圧部３１のそれほど上下動は大きくなく、プラス振動並びにマイナス振動のいずれでも、バルブ部３５が底部４６から離れて図８のＡに示す状態（すなわち中央開口部４７を開いた状態）になり、作動液は第２オリフィス５０を通って流動する。
このとき、第１オリフィス１４はアイドル振動の周波数で目詰まりしているため、作動液は第２オリフィス５０のみを通って第２共振を発生し、アイドル振動を吸収する。 Thereafter, when the input vibration becomes an idle vibration with a high frequency, the pressure receiving portion 31 does not move so much in the middle frequency due to the medium amplitude vibration or the small amplitude vibration, and the valve portion 35 is in the bottom 46 in both the positive vibration and the negative vibration. 8, the state shown in FIG. 8A (that is, the state where the central opening 47 is opened) is reached, and the working fluid flows through the second orifice 50.
At this time, since the first orifice 14 is clogged at the frequency of the idle vibration, the hydraulic fluid passes through only the second orifice 50 to generate the second resonance and absorb the idle vibration.

さらに入力振動の周波数が高くなって高周波小振幅振動になると、受圧部３１はプラス振動並びにマイナス振動のいずれでも図８のＡにおける状態を維持するが、第１オリフィス１４及び第２オリフィス５０は共に目詰まり状態となり、第１オリフィス１４及び第２オリフィス５０を通した作動液の流動が生じない。
このため、受圧部３１は支持バネ部３２を弾性変形させて上下動することにより、主液室１２の内圧変動を吸収する。 When the frequency of the input vibration is further increased to become high frequency and small amplitude vibration, the pressure receiving unit 31 maintains the state in FIG. 8A in both positive vibration and negative vibration, but both the first orifice 14 and the second orifice 50 are in the same state. The clogged state occurs, and the flow of hydraulic fluid through the first orifice 14 and the second orifice 50 does not occur.
For this reason, the pressure receiving part 31 absorbs fluctuations in the internal pressure of the main liquid chamber 12 by elastically deforming the support spring part 32 and moving up and down.

なお、過大振幅振動の入力時には、プラス振動のとき図８のＢに示す状態となり、第１オリフィス１４を通して主液室１２から副液室１３へ作動液が流動する。
その後マイナス振動に転じると、主液室１２は急速に拡大して一時的に負圧状態になる。
しかし、この負圧により、受圧部３１は上方へ吸引移動されるため、図８のＡに示す状態となり、中央開口部４７が開かれる。これにより、副液室１３の作動液は、第２オリフィス５０を通って迅速に主液室１２へ流入し、主液室１２の負圧を急速に解消する。
このため、過大振幅振動入力時において、主液室１２が一時的に負圧になることによって生じる気泡の破裂に伴う異音を発生するキャビテーション現象を抑制することができる。 When an excessive amplitude vibration is input, the state shown in FIG. 8B occurs when the positive vibration occurs, and the working fluid flows from the main liquid chamber 12 to the sub liquid chamber 13 through the first orifice 14.
Thereafter, when the vibration is changed to minus vibration, the main liquid chamber 12 rapidly expands and temporarily becomes a negative pressure state.
However, because the negative pressure causes the pressure receiving portion 31 to be sucked and moved upward, the state shown in A of FIG. 8 is obtained, and the central opening 47 is opened. As a result, the hydraulic fluid in the auxiliary liquid chamber 13 quickly flows into the main liquid chamber 12 through the second orifice 50, and the negative pressure in the main liquid chamber 12 is quickly eliminated.
For this reason, at the time of excessive amplitude vibration input, it is possible to suppress a cavitation phenomenon that generates an abnormal sound due to the bursting of bubbles caused by temporary negative pressure in the main liquid chamber 12.

図９はこのエンジンマウントにおける動特性を示すグラフであり、縦軸に減衰、横軸に入力振動周波数を示した減衰特性図である。この減衰特性曲線は、山形をなし、そのピーク部分が共振の発生を示し、ピークにおける周波数が共振周波数となる。
ベースの特性曲線は、図１４に示した従来例に係るものであり、第２オリフィスを第１オリフィスと、その主液室側開口近傍にて短絡させたものである。 FIG. 9 is a graph showing the dynamic characteristics of the engine mount, and is a damping characteristic diagram in which the vertical axis indicates attenuation and the horizontal axis indicates input vibration frequency. This attenuation characteristic curve has a mountain shape, the peak portion indicates the occurrence of resonance, and the frequency at the peak is the resonance frequency.
The characteristic curve of the base is related to the conventional example shown in FIG. 14, and the second orifice is short-circuited with the first orifice in the vicinity of the main liquid chamber side opening.

本発明１の特性曲線は、図３において実線で示す第１オリフィス１４の主液室側開口である第１の開口２４内側かつ近傍に、第２オリフィス５０の主液室側開口である第２の開口２５を開口させた例である。
この場合、第２オリフィス５０は最短となり、共振周波数は、例えば、ベースの２０Ｈｚに対して約２２Ｈｚと高くなる。 The characteristic curve of the first aspect of the present invention is a second curve that is the main liquid chamber side opening of the second orifice 50 inside and in the vicinity of the first opening 24 that is the main liquid chamber side opening of the first orifice 14 indicated by a solid line in FIG. This is an example in which the opening 25 is opened.
In this case, the second orifice 50 is the shortest, and the resonance frequency is, for example, about 22 Hz higher than the base 20 Hz.

本発明２の特性曲線は、第２の開口２５の位置を、図２において仮想線で示す第２の開口２５Ａとしたものであり、本発明１に対して周方向へ略４５°程度ずらした例である。
すなわち、第２の開口２５を図２の仮想線２５Ａで示すように、切り欠き部３８の位置から周方向へ例えば約４５°程度ずらすことで容易に長くすることができる。
ただし、切り欠き部４８は移動した第２の開口２５Ａへ連通するように、周方向へ拡幅するか、延長路５１を形成する。この延長路５１は、切り欠き部４８と第２の開口２５Ａを連通するように段部４３ａを周方向へ形成された溝である。 The characteristic curve of the present invention 2 is such that the position of the second opening 25 is the second opening 25A indicated by the phantom line in FIG. 2, and is shifted by about 45 ° in the circumferential direction with respect to the present invention 1. It is an example.
That is, the second opening 25 can be easily elongated by shifting the position of the notch 38 from the position of the notch 38 in the circumferential direction by about 45 °, for example, as indicated by a virtual line 25A in FIG.
However, the notch 48 widens in the circumferential direction or forms an extension path 51 so as to communicate with the moved second opening 25A. The extension path 51 is a groove in which a stepped portion 43a is formed in the circumferential direction so as to communicate the notch portion 48 and the second opening 25A.

このように第２の開口２５を周方向へずらすことは、第１の開口２４の内側となる段部２２上を利用するため、自由度が大きくなる。しかも、延長路５１によって第２オリフィス５０のオリフィス長が長くなり、共振周波数は、例えば、ベースの２０Ｈｚに対して約１８Ｈｚと低くなる。このように、第２オリフィス５０のオリフィス長を長くすると、第２共振の共振周波数を低くするように調整できる。 Since shifting the second opening 25 in the circumferential direction in this manner uses the step 22 on the inner side of the first opening 24, the degree of freedom increases. In addition, the length of the orifice of the second orifice 50 is increased by the extension path 51, and the resonance frequency is, for example, about 18 Hz lower than 20 Hz of the base. Thus, when the orifice length of the second orifice 50 is increased, the resonance frequency of the second resonance can be adjusted to be lowered.

本発明３の特性曲線は、第２の開口２５の位置を、図２において仮想線で示す第２の開口２５Ｂとして周方向へ略９０°程度ずらした例である。
第２の開口２５の開口位置を周方向へずらす程度は自由であり、第２オリフィス５０のオリフィス長が所望のものになるようにすればよい。図中の第２の開口２５Ｂは約９０°程度ずらし、この開口位置に応じてより長い延長路５２が延長路５１を延長して形成されている。このようにすると、第２オリフィス５０のオリフィス長がさらに長くなるため、共振周波数は、例えば、ベースの２０Ｈｚに対して約１６Ｈｚとさらに低くなる。 The characteristic curve of the third aspect of the present invention is an example in which the position of the second opening 25 is shifted by approximately 90 ° in the circumferential direction as the second opening 25B indicated by a virtual line in FIG.
The degree to which the opening position of the second opening 25 is shifted in the circumferential direction is arbitrary, and the orifice length of the second orifice 50 may be set to a desired one. The second opening 25B in the figure is shifted by about 90 °, and a longer extension path 52 is formed by extending the extension path 51 in accordance with the opening position. In this case, since the orifice length of the second orifice 50 is further increased, the resonance frequency is further reduced to, for example, about 16 Hz with respect to 20 Hz of the base.

すなわち、第２共振の共振周波数コントロールは、第２オリフィス５０の長さを長短に調整することで自由に行うことができ、第２オリフィス５０を第１オリフィス１４と独立させたことにより、第２共振の共振周波数コントロールにおける自由度が高くなる。
しかも、第２の開口２５は、第１の開口２４に対して周方向任意位置へ形成できるから、第２の開口２５の設置に関する自由度が高くなるとともに、第２オリフィス５０のオリフィス長を自由に調整できるようになる。
特に、第２の開口２５を第１の開口２４の内側に設けることにより、第２オリフィス５０を短くして第２共振周波数をより高くすることが容易になる。 That is, the resonance frequency control of the second resonance can be freely performed by adjusting the length of the second orifice 50 to be longer or shorter. By making the second orifice 50 independent of the first orifice 14, The degree of freedom in resonance resonance frequency control is increased.
In addition, since the second opening 25 can be formed at any position in the circumferential direction with respect to the first opening 24, the degree of freedom regarding the installation of the second opening 25 is increased, and the orifice length of the second orifice 50 is free. Can be adjusted.
In particular, by providing the second opening 25 inside the first opening 24, it is easy to shorten the second orifice 50 and increase the second resonance frequency.

また、第１オリフィス１４と一部を共通化させないため、第２共振時に目詰まりしている第１オリフィス１４により作動液の流動を阻害されることなく、正確に第２共振を発生させることができ、第２共振における共振周波数を精細にコントロールすることができる。
このように、第２オリフィス５０を第１オリフィス１４と別に設けることにより、第２オリフィス５０による第２共振の共振周波数を正確にコントロールできるようになる。 Further, since the first orifice 14 is not partially shared, the second resonance can be accurately generated without hindering the flow of the hydraulic fluid by the first orifice 14 clogged at the time of the second resonance. The resonance frequency in the second resonance can be finely controlled.
Thus, by providing the second orifice 50 separately from the first orifice 14, the resonance frequency of the second resonance by the second orifice 50 can be accurately controlled.

このため、弾性仕切部材３０の受圧部３１周囲に環状の第２オリフィス５０を形成する形式において、第２オリフィス５０が第１オリフィス１４の内側に近接して配置されるにもかかわらず、第１オリフィス１４の影響を受けずに第２共振における共振周波数を精細にコントロールすることができるようになり、かつ第２オリフィス５０の調整における自由度が大きくなる。 Therefore, in the form in which the annular second orifice 50 is formed around the pressure receiving portion 31 of the elastic partition member 30, the first orifice 50 is disposed close to the inside of the first orifice 14. The resonance frequency in the second resonance can be finely controlled without being affected by the orifice 14, and the degree of freedom in adjusting the second orifice 50 is increased.

そのうえ、受圧部３１と内周壁４３の間に第３液室３７を形成したので、この第３液室３７を利用して第２オリフィス５０を容易に形成できる。
しかも、受圧部３１の周囲を囲むリング状溝３３を設けることにより、このリング状溝３３を利用して第３液室３７を容易に形成できる。 In addition, since the third liquid chamber 37 is formed between the pressure receiving portion 31 and the inner peripheral wall 43, the second orifice 50 can be easily formed using the third liquid chamber 37.
In addition, by providing the ring-shaped groove 33 surrounding the pressure receiving portion 31, the third liquid chamber 37 can be easily formed using the ring-shaped groove 33.

また、リング状溝３３の外側を囲む周壁３４を設け、この一部に切り欠き部３８を設けることにより、切り欠き部３８を通してリング状溝３３を周壁３４の外方空間へ容易に接続できる。 Further, by providing the peripheral wall 34 surrounding the outer side of the ring-shaped groove 33 and providing the cutout portion 38 at a part thereof, the ring-shaped groove 33 can be easily connected to the outer space of the peripheral wall 34 through the cutout portion 38.

さらに、内周壁４３の一部に切り欠き部４８を設け、これを切り欠き部３８と接続することにより切り欠き部４８による空間を第２の開口２５及び第３液室３７と連通させることにより、切り欠き部４８を第２オリフィス５０の一部とすることができ、第２オリフィス５０を容易に形成することができる。 Further, a notch 48 is provided in a part of the inner peripheral wall 43 and is connected to the notch 38 so that the space by the notch 48 is communicated with the second opening 25 and the third liquid chamber 37. The notch 48 can be a part of the second orifice 50, and the second orifice 50 can be easily formed.

また、エンジンマウントとして構成し、第２共振をアイドル振動域で発生するようにチューニングしたので、特別にアイドルオリフィス及びその開閉機構を設けることなく、従来の弾性仕切部材を利用して第２オリフィスを設けることにより第２共振を実現できるとともにアイドル振動を有効に遮断できる。 In addition, since it is configured as an engine mount and tuned so that the second resonance is generated in the idle vibration region, the second orifice can be made using a conventional elastic partition member without specially providing an idle orifice and its opening / closing mechanism. By providing, the second resonance can be realized and the idle vibration can be effectively cut off.

さらにまた、受圧部３１が厚肉の高剛性構造をなし、想定される大振幅振動以下の振動入力では容易に弾性変形しないようになっているため、弾性仕切部材３０において主液室１２の内圧変化を吸収するためのバネ部を支持バネ部３２に限定でき、内圧吸収のためのバネを正確にコントロールできる。また、受圧部３１は第２オリフィス５０の開閉弁として機能するが、この際における開閉を正確にすることができる。 Furthermore, since the pressure receiving portion 31 has a thick and highly rigid structure and is not easily elastically deformed by a vibration input equal to or less than the assumed large amplitude vibration, the internal pressure of the main liquid chamber 12 in the elastic partition member 30 can be reduced. The spring portion for absorbing the change can be limited to the support spring portion 32, and the spring for absorbing the internal pressure can be accurately controlled. Moreover, although the pressure receiving part 31 functions as an on-off valve for the second orifice 50, the opening and closing at this time can be made accurate.

次に、バルブ部３５の構造を変更した別実施例を説明する。なお、以下の各例は、それぞれ図８のＡにおいて、バルブ部３５又はその近傍部を変更したものである。これらはいずれも、第１実施例と共通部分には共通の符号を用い、重複部分の説明を原則として省略する。 Next, another embodiment in which the structure of the valve portion 35 is changed will be described. Each example below is obtained by changing the valve portion 35 or its vicinity in FIG. 8A. In any case, the same reference numerals are used for the parts common to the first embodiment, and the explanation of the overlapping parts is omitted in principle.

図１０は、第２実施例に係り、リング状溝３３に臨む受圧部３１の外周部側面に環状凹部３６を設けた例である。この環状凹部３６は、図１０の断面にて受圧部３１の径方向内側へ凹入し、受圧部３１の側部全周に環状をなしている。また、リング状溝３３へ向かって開放されており、この環状凹部３６とリング状溝３３により、受圧部３１の周囲全周を囲む環状空間からなる第３液室３７が形成されている。 FIG. 10 relates to the second embodiment and is an example in which an annular recess 36 is provided on the outer peripheral side surface of the pressure receiving portion 31 facing the ring-shaped groove 33. The annular recess 36 is recessed inward in the radial direction of the pressure receiving portion 31 in the cross section of FIG. 10, and has an annular shape around the side portion of the pressure receiving portion 31. The ring-shaped groove 33 is opened toward the ring-shaped groove 33, and the annular liquid recess 37 and the ring-shaped groove 33 form a third liquid chamber 37 formed of an annular space surrounding the entire circumference of the pressure receiving portion 31.

環状凹部３６の下方にはバルブ部３５が形成されている。バルブ部３５は外側方へ突出する環状凸部として形成されている。
このように、受圧部３１の外周面に環状凹部３６を設けると、環状凹部３６の空間を第３液室３７に含めることができ、第３液室３７の容量を大きくすることができる。 A valve portion 35 is formed below the annular recess 36. The valve part 35 is formed as an annular convex part protruding outward.
Thus, when the annular recess 36 is provided on the outer peripheral surface of the pressure receiving portion 31, the space of the annular recess 36 can be included in the third liquid chamber 37, and the capacity of the third liquid chamber 37 can be increased.

この第３液室３７は、主液室１２及び副液室１３を第１及び第２の液室としたとき、これらに続く３番目の液室を意味する。
第３液室３７には作動液が満たされ、バルブ部３５が中央開口部４７を開閉することにより、副液室１３と連通又は遮断される。 The third liquid chamber 37 means a third liquid chamber following the first liquid chamber 12 and the sub liquid chamber 13 as the first and second liquid chambers.
The third liquid chamber 37 is filled with hydraulic fluid, and the valve portion 35 opens or closes the central opening 47 to communicate with or shut off the sub liquid chamber 13.

図１１は、第３実施例に係り、受圧部３１の中央部を最も薄肉の可動膜部３１ｂとし、外周部を厚肉とし、バルブ部３５を受圧部３１の外周下部にて外側方へ突出させ、支持壁４４の内壁４４ａへ若干離して位置させたものである。
このようにすると、受圧部３１が主液室１２の内圧を受けると、可動膜部３１ｂが最も大きく下方へ変形するため、バルブ部３５は外側方へ押し出され、仮想線で示すように、内壁４４ａへ押し当てられる。
これにより、第２オリフィス５０が閉じられるとともに、バルブ部３５は受圧部３１の変形量に応じて、受圧部３１のバネを非線形的に増大させることができる。 FIG. 11 relates to the third embodiment, wherein the central portion of the pressure receiving portion 31 is the thinnest movable film portion 31b, the outer peripheral portion is thick, and the valve portion 35 protrudes outward at the lower peripheral portion of the pressure receiving portion 31. The support wall 44 is positioned slightly away from the inner wall 44a.
In this case, when the pressure receiving part 31 receives the internal pressure of the main liquid chamber 12, the movable film part 31b is deformed downward most, so that the valve part 35 is pushed outward and the inner wall as shown by a virtual line. 44a.
Thereby, the second orifice 50 is closed, and the valve portion 35 can increase the spring of the pressure receiving portion 31 in a non-linear manner according to the deformation amount of the pressure receiving portion 31.

図１２は、第４実施例に係り、図１１と同様に可動膜部３１ｂを設けるとともに、バルブ部３５を下方へ突出させたものであり、受圧部３１が下方へ移動すると、バルブ部３５の下面がバルブシート部４６ａへ押し当てられて第２オリフィス５０を閉じるとともに、バルブ部３５が突起状をなすため、受圧部３１がさらに下方へ移動すると、バルブシート部４６ａにより圧縮され、図１１と同様に、受圧部３１の移動量に応じて受圧部３１のバネを変化させることができる。 FIG. 12 relates to the fourth embodiment, in which the movable film portion 31b is provided in the same manner as in FIG. 11, and the valve portion 35 is protruded downward. When the pressure receiving portion 31 moves downward, the valve portion 35 of FIG. Since the lower surface is pressed against the valve seat portion 46a to close the second orifice 50 and the valve portion 35 has a projection shape, when the pressure receiving portion 31 moves further downward, it is compressed by the valve seat portion 46a. Similarly, the spring of the pressure receiving portion 31 can be changed according to the movement amount of the pressure receiving portion 31.

図１３は、第５実施例に係り、図１２におけるバルブ部３５と同一構造のバルブ部３５を用いるが、側方にて底部４６側へ押し当てられるようにしたものである。
図１３のＡは、バルブ部３５の移動する上下方向と斜交するよう斜面部６０を設けたものであり、Ａは斜面部６０を外周側、Ｂは内周側にそれぞれ設けた例である。 FIG. 13 relates to the fifth embodiment, and uses a valve portion 35 having the same structure as the valve portion 35 in FIG. 12, but is pressed to the bottom 46 side on the side.
13A shows an example in which a slope portion 60 is provided so as to obliquely intersect with the vertical direction in which the valve portion 35 moves. A is an example in which the slope portion 60 is provided on the outer peripheral side, and B is provided on the inner peripheral side. .

このように、斜面部６０を設けると、受圧部３１が下方へ移動したとき、バルブ部３５の角部が斜面部６０と接触することにより第２オリフィス５０を閉じるとともに、受圧部３１がさらに下方へ移動すると、バルブ部３５と斜面部６０の接触量が大きくなり、バルブ部３５の圧縮量が増大するため、図１１と同様に、受圧部３１の移動量に応じて受圧部３１のバネを変化させることができる。 As described above, when the inclined surface portion 60 is provided, when the pressure receiving portion 31 moves downward, the corner portion of the valve portion 35 comes into contact with the inclined surface portion 60 to close the second orifice 50, and the pressure receiving portion 31 further moves downward. Since the amount of contact between the valve portion 35 and the slope portion 60 increases and the amount of compression of the valve portion 35 increases, the spring of the pressure receiving portion 31 is moved according to the amount of movement of the pressure receiving portion 31 as in FIG. Can be changed.

なお、このように斜面部６０を設けることで、受圧部３１のバネを変化させる構成は、他の形式のバルブ部３５にも応用でき、例えば、図１１のバルブ部３５を斜面部６０へ押し当てるようにしてもよい。
また、図５や図１０に示す厚肉の受圧部３１に対して適用してもよい。この場合、図５や図１０のバルブ部３５を斜面部６０へ押し当てるようにすると、受圧部３１のバネ変化を期待できないが、主液室１２側の液圧に押されたバルブ部３５が斜面部６０へ強く押し当てられるため、閉弁時の密着を高めることができる。 In addition, the structure which changes the spring of the pressure receiving part 31 by providing the slope part 60 in this way can be applied also to the valve part 35 of another type, for example, the valve part 35 of FIG. You may make it hit.
Moreover, you may apply with respect to the thick pressure-receiving part 31 shown in FIG.5 and FIG.10. In this case, if the valve portion 35 of FIGS. 5 and 10 is pressed against the slope portion 60, the spring change of the pressure receiving portion 31 cannot be expected, but the valve portion 35 pushed by the liquid pressure on the main liquid chamber 12 side Since it is strongly pressed against the slope part 60, the close_contact | adherence at the time of valve closing can be improved.

なお、本願発明は上記各実施例に限定されず、種々に変形等が可能であり、例えば、本願発明をエンジンマウント以外のサスペンションマウントなど、各種の車両用液封防振装置に適用できる。また、第２の開口２５を、主液室に臨む少なくとも１以上の開口、すなわち１又は複数の開口で形成することができる。このようにすると、第２の開口２５における形状の自由度が大きくすることができ、形成場所に応じて最適形状にすることができる。
さらに、第２の開口２５位置は、第１の開口２４の内側位置に限定されるものではなく、例えば、第１の開口２４と周方向へ並んで配置したり、第１の開口２４よりも外側へ配置することもできる。 The present invention is not limited to the above embodiments, and various modifications can be made. For example, the present invention can be applied to various vehicle liquid seal vibration isolator such as a suspension mount other than an engine mount. Further, the second opening 25 can be formed by at least one opening facing the main liquid chamber, that is, one or a plurality of openings. If it does in this way, the freedom degree of the shape in the 2nd opening 25 can be enlarged, and it can be set as the optimal shape according to a formation place.
Further, the position of the second opening 25 is not limited to the position inside the first opening 24, and for example, it is arranged side by side in the circumferential direction with the first opening 24, or more than the first opening 24. It can also be arranged outside.

１：第１の取付部材、２：第２の取付部材、３：弾性本体部、１１：仕切部材、１２：主液室、１３：副液室、１４：第１オリフィス、２０：カバー部材、２４：第１の開口、２５：第２の開口、３０：弾性仕切部材、３１：受圧部、３３：リング状溝、３５：バルブ部、３６：環状凹部、３７：第３液室、３８：切り欠き部、４０：枠部材、４３ａ：段部、４４：支持壁、４８：切り欠き部、４８ａ：切り欠き空間、５０：第２オリフィス 1: first mounting member, 2: second mounting member, 3: elastic body, 11: partition member, 12: main liquid chamber, 13: sub liquid chamber, 14: first orifice, 20: cover member, 24: 1st opening, 25: 2nd opening, 30: Elastic partition member, 31: Pressure receiving part, 33: Ring-shaped groove, 35: Valve part, 36: Annular recessed part, 37: 3rd liquid chamber, 38: Notch, 40: frame member, 43a: step, 44: support wall, 48: notch, 48a: notch space, 50: second orifice

Claims

A first attachment member (1) attached to the vibration source side, a second attachment member (2) attached to the vibration transmitted side, and an elastic main body (3) provided therebetween are provided. A liquid chamber having a body portion as a part of a wall is formed, and the liquid chamber is partitioned into a main liquid chamber (12) and a sub liquid chamber (13) by a partition member (11), and the main liquid chamber An elastic partition member that communicates between the sub-liquid chambers with a first orifice (14) that generates a first resonance with a predetermined input vibration, and that is elastically deformed so as to absorb a change in the internal pressure of the main liquid chamber in at least part of the partition member 30)
A second orifice (50) communicating with the partition member (11) through the main liquid chamber (12) and the sub liquid chamber (13) and resonating at a frequency different from the first resonance of the first orifice (14). And opening and closing the second orifice (50) by a part of the elastic partition member (30),
The partition member (11) includes the first orifice (14) on the outer peripheral portion, and a first opening (24) that is an opening on the main liquid chamber (12) side,
The second orifice (50) is formed separately from the first orifice (14), and the second opening (25), which is the main liquid chamber side opening, is formed in the first opening (24). and with are formed separately,
The partition member (11) includes the elastic partition member (30), a frame member (40) for fitting the elastic partition member (30), and the elastic partition member (30) to the frame member (40). A cover member (20) for fixing,
The elastic partition member (30) includes a central pressure receiving portion (31) and a support spring portion (32) provided on the outer peripheral portion,
The frame member (40) has an annular groove (41) formed between the outer peripheral wall (42) and the inner peripheral wall (43) at the outer peripheral portion;
A support wall (44) that supports the outer peripheral portion of the elastic partition member (30) inside the inner peripheral wall (43);
A central opening (47) that opens to the inside of the support wall (44) and communicates with the auxiliary liquid chamber (13) and that is opened and closed by the pressure receiving portion (31);
The second orifice (50) has one end communicating with the second opening (25) and the other end communicating with the central opening (47), and the inner peripheral wall (43) and the pressure receiving portion (31). A liquid seal vibration isolator having a third liquid chamber (37) formed therebetween.

The elastic partition member (30) is formed with a ring-shaped groove (33) surrounding the outer periphery of the pressure receiving portion (31), and the ring-shaped groove (33) constitutes the third liquid chamber (37). The liquid seal vibration isolator according to claim 1 .

An annular recess (36) opened toward the ring-shaped groove (33) is formed on the entire outer peripheral surface of the pressure receiving portion (31), and the annular recess (36) is formed in the third liquid chamber (37). The liquid seal vibration isolator according to claim 2 , which is a part of

The elastic partition member (30) is integrally provided with a peripheral wall (34) surrounding the pressure receiving portion (31) with a space therebetween, and the ring-shaped groove (between the peripheral wall (34) and the pressure receiving portion (31) is provided. 33) and a notch (38) is provided in a part of the peripheral wall (34) so that the ring-shaped groove (33) communicates with the outer space of the peripheral wall (34). Liquid seal vibration isolator described in 2 or 3 .

A notch (48) is provided at a position continuous with the notch (38) of the inner peripheral wall (43);
The liquid seal vibration isolator according to claim 4 , wherein the notch (48) communicates with the second opening (25) and the third liquid chamber (37) .