JPH0718046U - Liquid-filled mount - Google Patents

Liquid-filled mount

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Publication number
JPH0718046U
JPH0718046U JP4801693U JP4801693U JPH0718046U JP H0718046 U JPH0718046 U JP H0718046U JP 4801693 U JP4801693 U JP 4801693U JP 4801693 U JP4801693 U JP 4801693U JP H0718046 U JPH0718046 U JP H0718046U
Authority
JP
Japan
Prior art keywords
orifice
liquid
liquid chamber
partition wall
movable member
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP4801693U
Other languages
Japanese (ja)
Inventor
川居洋志
Original Assignee
エヌ・オー・ケー・メグラスティック株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by エヌ・オー・ケー・メグラスティック株式会社 filed Critical エヌ・オー・ケー・メグラスティック株式会社
Priority to JP4801693U priority Critical patent/JPH0718046U/en
Publication of JPH0718046U publication Critical patent/JPH0718046U/en
Pending legal-status Critical Current

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  • Combined Devices Of Dampers And Springs (AREA)

Abstract

(57)【要約】 【目的】 広範囲の周波数域の振動に対して良好な減衰
効果を発揮させる。 【構成】 隔壁4の上面側に弾性体2で囲まれた第1の
液室18を形成するとともに、隔壁4の下面側にダイア
フラム16で囲まれた第2の液室19を形成する。隔壁
4は環状の固定部材6と、この固定部材6に回転可能に
装着される可動部材8とからなり、固定部材6の内周面
の上面側には、中心からの距離が回転角に比例して順次
大きくなるスパイラル状の溝7が形成され、可動部材8
の外周面の上面側には、中心からの距離が回転角に比例
して順次小さくなるスパイラル状の溝9が形成され、こ
れらの溝7、9の協働により第1の液室18と第2の液
室19との間を連通するオリフィス11が形成される。
オリフィス11は可動部材8の回転によって断面積、長
さを変化させる。
(57) [Summary] [Purpose] To exert a good damping effect on vibrations in a wide range of frequencies. A first liquid chamber 18 surrounded by an elastic body 2 is formed on the upper surface side of the partition wall 4, and a second liquid chamber 19 surrounded by a diaphragm 16 is formed on the lower surface side of the partition wall 4. The partition wall 4 is composed of an annular fixed member 6 and a movable member 8 rotatably mounted on the fixed member 6. On the upper surface side of the inner peripheral surface of the fixed member 6, the distance from the center is proportional to the rotation angle. Then, the spiral groove 7 that becomes larger in size is formed, and the movable member 8
A spiral groove 9 whose distance from the center gradually decreases in proportion to the rotation angle is formed on the upper surface side of the outer peripheral surface of the first liquid chamber 18 and the first liquid chamber 18 by the cooperation of these grooves 7, 9. An orifice 11 that communicates with the second liquid chamber 19 is formed.
The orifice 11 changes its sectional area and length by the rotation of the movable member 8.

Description

【考案の詳細な説明】[Detailed description of the device]

【0001】[0001]

【産業上の利用分野】[Industrial applications]

この考案は内燃機関等の振動発生源を防振支持する液体封入式マウントに関し 、特に、広範囲の周波数域における振動に対して良好な減衰効果を発揮すること のできる液体封入式マウントに関するものである。 The present invention relates to a liquid-filled mount for supporting a vibration source such as an internal combustion engine in a vibration-proof manner, and more particularly to a liquid-filled mount capable of exhibiting a good damping effect on vibration in a wide frequency range. .

【0002】[0002]

【従来技術およびその問題点】[Prior art and its problems]

一般に、内燃機関等の振動発生源からの振動を、それを支持する外部部材へ極 力伝達させないようにするため、内部に液体を封入した液体封入式マウントが使 用されている。 Generally, in order to prevent the vibration from a vibration source such as an internal combustion engine from being transmitted to an external member that supports it, a liquid-filled mount in which a liquid is filled is used.

【0003】 このような液体封入式マウントとしては、例えば、実開昭63−24436号 公報に開示された液体封入式マウントや、実開昭63−3537号公報に開示さ れた液体封入式マウント(液体封入防振装置)等が既に知られている。As such a liquid-filled mount, for example, the liquid-filled mount disclosed in Japanese Utility Model Publication No. 63-24436 and the liquid-filled mount disclosed in Japanese Utility Model Publication No. 63-3537. (Liquid filled vibration isolation device) and the like are already known.

【0004】 ここで、前者は、マウント内部を2液室に区画する隔壁を、固定側プレートと 固定側プレートに回転可能に装着される可動側プレートとで構成するとともに、 固定側プレートに設けた螺旋状の通路と可動側プレートに設けた螺旋状の通路の 協働によって2液室間を連通するオリフィスを形成したものであって、可動側プ レートの回転によってオリフィスの長さを変更可能としたものである。Here, in the former, the partition wall that divides the inside of the mount into two liquid chambers is composed of a fixed-side plate and a movable-side plate that is rotatably mounted on the fixed-side plate, and is provided on the fixed-side plate. The orifice that communicates between the two liquid chambers is formed by the cooperation of the spiral passage and the spiral passage provided in the movable plate, and the length of the orifice can be changed by rotating the movable plate. It was done.

【0005】 また、後者は、マウント内部を2液室に区画する隔壁に開口部を設けるととも に、この開口部に半径が漸次変化する外周面を有する回転弁体を回転可能に設け て、回転弁体と開口部との間で2液室間を連通するオリフィスを形成したもので あって、回転弁体の回転によってオリフィスの断面積を変更可能としたものであ る。In the latter, an opening is provided in a partition wall that divides the mount interior into two liquid chambers, and a rotary valve body having an outer peripheral surface whose radius gradually changes is rotatably provided in the opening. An orifice that connects the two liquid chambers is formed between the rotary valve body and the opening, and the cross-sectional area of the orifice can be changed by rotating the rotary valve body.

【0006】 しかしながら、前者にあっては、オリフィスの長さを変えることでしかオリフ ィス特性を変えることができないため、減衰効果が得られる範囲がオリフィスの 長さの可変範囲内に限られてしまい、内燃機関等のように広範囲の周波数域にお いて種々の振動が発生する箇所においては一部の周波数域の振動に対してしか良 好な減衰効果が得られない。However, in the former case, since the orifice characteristic can be changed only by changing the length of the orifice, the range in which the damping effect can be obtained is limited to the variable range of the length of the orifice. Therefore, in a place where various vibrations occur in a wide frequency range such as an internal combustion engine, a good damping effect can be obtained only for vibrations in some frequency ranges.

【0007】 また、後者にあっては、オリフィスの断面積を変えることでしかオリフィス特 性を変えることができなため、減衰効果が得られる範囲がオリフィスの断面積の 可変範囲内に限られてしまい、内燃機関等のように広範囲の周波数域において種 々の振動が発生する箇所においては一部の周波数域の振動に対してしか良好な減 衰効果が得られない。Further, in the latter case, since the orifice characteristics can be changed only by changing the cross-sectional area of the orifice, the range in which the damping effect can be obtained is limited to the variable range of the cross-sectional area of the orifice. Therefore, in a place where various vibrations occur in a wide frequency range such as an internal combustion engine, a good damping effect can be obtained only for vibrations in some frequency ranges.

【0008】 この考案は前記のような従来のもののもつ問題点を解決したものであって、オ リフィスの長さ、断面積の両方を可変とすることによって、内燃機関等のように 広範囲の周波数域において種々の振動が発生する箇所においても広範囲の周波数 域において良好な減衰効果が得られる液体封入式マウントを提供することを目的 とするものである。This invention solves the problems of the conventional ones described above, and by making both the length and the cross-sectional area of the orifice variable, a wide range of frequencies such as in an internal combustion engine can be obtained. It is an object of the present invention to provide a liquid-filled mount that can obtain a good damping effect in a wide frequency range even in a region where various vibrations occur.

【0009】[0009]

【問題点を解決するための手段】[Means for solving problems]

上記の問題点を解決するためにこの考案は、環状の固定部材と、この固定部材 の内側に回転可能に設けられる円板状の可動部材とからなる隔壁と、この隔壁の 上面側に周縁部を固定され、隔壁との間で液体を封入した第1の液室を形成する 弾性体と、隔壁の下面側に周縁部を固定され、隔壁との間で液体を封入した第2 の液室を形成するダイアフラムとを具え、前記固定部材と可動部材との間に、一 端が前記第1の液室に連通し、他端が前記第2の液室に連通するオリフィスを形 成し、このオリフィスは可動部材の回転位置に応じて長さ、断面積が変化すると いう手段を採用したものである。 In order to solve the above-mentioned problems, the present invention has a partition wall composed of an annular fixing member and a disk-shaped movable member rotatably provided inside the fixing member, and a peripheral edge portion on the upper surface side of the partition wall. And an elastic body that forms a first liquid chamber in which the liquid is sealed between the partition and a second liquid chamber that has a peripheral portion fixed to the lower surface side of the partition and that seals the liquid between the partition and And a diaphragm forming a diaphragm, forming an orifice between the fixed member and the movable member, one end of which communicates with the first liquid chamber and the other end of which communicates with the second liquid chamber, This orifice employs a means in which the length and cross-sectional area of the orifice change depending on the rotational position of the movable member.

【0010】[0010]

【作用】[Action]

この考案は前記のような手段を採用したことにより、可動部材を回転させると 、その回転位置に応じた長さ、断面積のオリフィスが得られることになる。した がって、可動部材の回転位置に応じて得られるオリフィス特性の範囲を大幅に広 げることができる。 According to this invention, by adopting the above-mentioned means, when the movable member is rotated, the orifice having the length and the cross-sectional area according to the rotating position can be obtained. Therefore, the range of orifice characteristics obtained according to the rotational position of the movable member can be broadened significantly.

【0011】[0011]

【実施例】【Example】

以下、図面に示すこの考案の実施例について説明する。 図1〜図3には、この考案による液体封入式マウントの一実施例が示されてい て、図1は全体を示す縦断面図、図2は図1に示すもののA−A線断面図、図3 は図1に示すものの隔壁の組立て方法を示した斜視図である。 An embodiment of the present invention shown in the drawings will be described below. 1 to 3 show one embodiment of a liquid-filled mount according to the present invention, FIG. 1 is a vertical sectional view showing the whole, and FIG. 2 is a sectional view taken along the line AA of FIG. FIG. 3 is a perspective view showing a method of assembling the partition shown in FIG.

【0012】 すなわち、この液体封入式マウントは、内燃機関等の振動発生源に取付けられ る本体部1と、この本体部1の下面側に上面側が一体に連結されるとともに、下 面側に窪み部3が穿設されている弾性体2と、この弾性体2の下面側周縁部に上 面側周縁部が一体に連結される隔壁4と、この隔壁4の下面側周縁部に周縁部が 固定される薄肉円板状のダイアフラム16と、このダイアフラム16の周縁部を 前記隔壁4の下面側に固定するとともに、振動発生源を支持する外部部材に取付 けられる椀形状の下蓋17とを具えており、前記弾性体2の窪み部3によって前 記隔壁4の上面側に液体を封入した第1の液室18が形成されるとともに、前記 ダイアフラム16によって前記隔壁4の下面側に液体を封入した第2の液室19 が形成され、両液室18、19間は前記隔壁4に形成した後述するオリフィス1 1を介して互いに連通するようになっている。That is, this liquid-filled mount has a main body 1 attached to a vibration source such as an internal combustion engine, an upper surface integrally connected to a lower surface side of the main body 1, and a recessed portion on a lower surface side. An elastic body 2 having a portion 3 formed therein, a partition wall 4 integrally connecting the upper surface side peripheral edge portion to the lower surface side peripheral edge portion of the elastic body 2, and a peripheral edge portion at the lower surface side peripheral edge portion of the partition wall 4. A thin disk-shaped diaphragm 16 to be fixed and a bowl-shaped lower lid 17 fixed to the lower surface side of the partition wall 4 of the diaphragm 16 and attached to an external member supporting a vibration source are provided. The recess 3 of the elastic body 2 forms a first liquid chamber 18 in which the liquid is sealed on the upper surface side of the partition wall 4, and the diaphragm 16 stores the liquid on the lower surface side of the partition wall 4. The enclosed second liquid chamber 19 The two liquid chambers 18, 19 are formed so as to communicate with each other via an orifice 11 (described later) formed in the partition wall 4.

【0013】 前記隔壁4は、環状をなす外枠5と、この外枠5の内側に嵌合されるとともに 、内周面の上面側の一部に、反時計回りに中心からの距離が回転角に比例して順 次大きくなるスパイラル状の溝7を形成した環状の固定部材6と、この固定部材 6の内面側に摺動可能、かつ回転可能に設けられるとともに、外周面の上面側の 一部に、時計回りに中心からの距離が回転角に比例して順次小さくなるスパイラ ル状の溝9を形成した円板状の可動部材8と、固定部材6と可動部材8の上面側 に設けられ、両部材6、8の溝7、9の上面側開口部を閉塞する円板状の蓋部材 10とから構成されている(図2および図3参照)。The partition wall 4 is fitted to the outer frame 5 having an annular shape, and is fitted inside the outer frame 5, and a part of the inner peripheral surface on the upper surface side is rotated counterclockwise from the center. An annular fixing member 6 formed with a spiral groove 7 that gradually increases in proportion to the angle, and is provided slidably and rotatably on the inner surface side of this fixing member 6 and on the upper surface side of the outer peripheral surface. A disk-shaped movable member 8 having a spiral groove 9 in which the distance from the center gradually decreases clockwise in proportion to the rotation angle, and a fixed member 6 and an upper surface side of the movable member 8. It is provided with a disk-shaped lid member 10 that closes the upper surface side openings of the grooves 7 and 9 of both members 6 and 8 (see FIGS. 2 and 3).

【0014】 そして、前記可動部材8を回転させてその外周面の溝9を前記固定部材6の溝 7に合致させることで適宜の長さ、断面積のオリフィス11が形成されるように なっている。この場合、オリフィス11の一端は可動部材8の溝9の終端に設け られている貫通孔9aを介して前記第2の液室19と連通し、オリフィス11の 他端は固定部材6の溝7の始端に対応する前記蓋部材10の部位に設けられてい る貫通孔10aを介して前記第1の液室18と連通するようになっている。Then, by rotating the movable member 8 so that the groove 9 on the outer peripheral surface thereof is aligned with the groove 7 of the fixed member 6, the orifice 11 having an appropriate length and cross-sectional area is formed. There is. In this case, one end of the orifice 11 communicates with the second liquid chamber 19 through a through hole 9a provided at the end of the groove 9 of the movable member 8, and the other end of the orifice 11 has the groove 7 of the fixed member 6. It is adapted to communicate with the first liquid chamber 18 through a through hole 10a provided in a portion of the lid member 10 corresponding to the starting end of the.

【0015】 また、前記可動部材8の下面中央部にはベベルギヤ12が一体に取付けられて いるとともに、このベベルギヤ12に噛合するベベルギヤ13を先端部に取付け た回転軸14が前記隔壁4の外枠5に軸受15を介して回転可能に装着されてい る。この場合、前記回転軸14は図示しないアクチュエータ等の駆動源に連結さ れていて、駆動源の作動により回転軸14、両ベベルギヤ13、12を介して前 記可動部材8を所望の位置に回転位置決めすることにより、その位置に応じた長 さ、断面積のオリフィス11が得られるようになっている。Further, a bevel gear 12 is integrally attached to the central portion of the lower surface of the movable member 8, and a rotary shaft 14 having a bevel gear 13 meshing with the bevel gear 12 at the tip is attached to the outer frame of the partition wall 4. 5 is rotatably mounted on the bearing 5 through a bearing 15. In this case, the rotary shaft 14 is connected to a drive source such as an actuator (not shown), and the movable member 8 is rotated to a desired position via the rotary shaft 14 and both bevel gears 13 and 12 by the operation of the drive source. By positioning, the orifice 11 having a length and a sectional area corresponding to the position can be obtained.

【0016】 上記のように構成したこの実施例による液体封入式マウントにあっては、図2 に示す状態から可動部材8を時計回りに回転させる程、すなわち、可動部材8の 溝9の始端を固定部材6の溝7の始端に一致させる方向に可動部材8を回転させ る程、細くて長いオリフィス11が得られることになり、図2の状態から可動部 材8を反時計回りに回転させる程、すなわち、可動部材8の溝9の終端を固定部 材6の溝7の終端に一致させる方向に可動部材8を回転させる程、太くて短いオ リフィス11が得られることになる。In the liquid-filled mount according to this embodiment configured as described above, the more the clockwise rotation of the movable member 8 from the state shown in FIG. 2, that is, the starting end of the groove 9 of the movable member 8 is made. As the movable member 8 is rotated in a direction to match the starting end of the groove 7 of the fixed member 6, a thin and long orifice 11 is obtained, and the movable member 8 is rotated counterclockwise from the state of FIG. The thicker and shorter the orifice 11 is obtained as the movable member 8 is rotated in the direction in which the end of the groove 9 of the movable member 8 is aligned with the end of the groove 7 of the fixed member 6.

【0017】 したがって、回転軸14に連結する図示しないアクチュエータを作動させ、回 転軸14、ベベルギヤ13、12を介して可動部材8を所望の位置に回転位置決 めすることにより、その位置に応じた長さ、断面積を有するオリフィス特性が得 られることになり、これにより、従来のオリフィスの長さだけしか変更できない マウントやオリフィスの断面積だけしか変更できないマウントに比べて、得られ るオリフィス特性を大幅に増やすことができることになる。この結果、内燃機関 等のように、低周波から高周波までの広範囲の周波数域において種々の振動が発 生する箇所においても、入力する種々の振動に対して良好な減衰効果を発揮する ことができることになる(図4参照)。Therefore, an actuator (not shown) connected to the rotary shaft 14 is operated to rotationally position the movable member 8 to a desired position via the rotary shaft 14 and the bevel gears 13 and 12, so that the movable member 8 can be moved in accordance with the position. Orifice characteristics with different lengths and cross-sectional areas can be obtained, which makes it possible to obtain orifice characteristics in comparison with conventional mounts that can change only the length of the orifice and mounts that can change only the cross-sectional area of the orifice. Can be significantly increased. As a result, even in a place where various vibrations are generated in a wide frequency range from low frequency to high frequency, such as an internal combustion engine, it is possible to exert a good damping effect on various input vibrations. (See FIG. 4).

【0018】[0018]

【考案の効果】[Effect of device]

この考案は前記のように構成したことにより、可動部材の回転位置に応じてオ リフィスの長さ、断面積を変更することができることになる。したがって、オリ フィスの長さのみの変更が可能なマウント、オリフィスの断面積のみの変更が可 能なマウントに比べて減衰効果が得られる範囲を大幅に広げることができること になり、これにより、内燃機関等のように、低周波から高周波までの広範囲の周 波数域において種々の振動が発生する箇所においても良好な減衰効果を発揮する ことができることになる等の優れた効果を有するものである。 With this configuration, the invention can change the length and sectional area of the orifice according to the rotational position of the movable member. Therefore, the range in which the damping effect can be obtained can be greatly expanded compared to the mount in which only the length of the orifice can be changed and the mount in which only the cross-sectional area of the orifice can be changed. It has an excellent effect that it can exhibit a good damping effect even in a place where various vibrations occur in a wide frequency range from low frequency to high frequency, such as an engine.

【図面の簡単な説明】[Brief description of drawings]

【図1】この考案による液体封入式マウントの一実施例
を示した縦断面図である。
FIG. 1 is a vertical sectional view showing an embodiment of a liquid-filled mount according to the present invention.

【図2】図1に示すもののA−A線断面図である。FIG. 2 is a sectional view taken along line AA of the one shown in FIG.

【図3】図1に示すものの隔壁の組立て方法を示した斜
視図である。
FIG. 3 is a perspective view showing a method of assembling the partition wall shown in FIG.

【図4】図1に示すものの特性図である。FIG. 4 is a characteristic diagram of what is shown in FIG.

【符号の説明】[Explanation of symbols]

1……本体部 2……弾性体 3……窪み部 4……隔壁 5……外枠 6……固定部材 7……溝 8……可動部材 9……溝 9a……貫通孔 10……蓋部材 10a……貫通孔 11……オリフィス 12、13……ベベルギヤ 14……回転軸 15……軸受 16……ダイアフラム 17……下蓋 18……第1の液室 19……第2の液室 1 ... Main body 2 ... Elastic body 3 ... Recessed portion 4 ... Partition wall 5 ... Outer frame 6 ... Fixed member 7 ... Groove 8 ... Movable member 9 ... Groove 9a ... Through hole 10 ... Lid member 10a ... Through hole 11 ... Orifice 12, 13 ... Bevel gear 14 ... Rotating shaft 15 ... Bearing 16 ... Diaphragm 17 ... Lower lid 18 ... First liquid chamber 19 ... Second liquid Room

───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 FI 技術表示箇所 F16F 13/00 S ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI technical display area F16F 13/00 S

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 【請求項1】 環状の固定部材(6)と、この固定部材
(6)の内側に回転可能に設けられる円板状の可動部材
(8)とからなる隔壁(4)と、この隔壁(4)の上面
側に周縁部を固定され、隔壁(4)との間で液体を封入
した第1の液室(18)を形成する弾性体(2)と、隔
壁(4)の下面側に周縁部を固定され、隔壁(4)との
間で液体を封入した第2の液室(19)を形成するダイ
アフラム(16)とを具え、前記固定部材(6)と可動
部材(8)との間に、一端が前記第1の液室(18)に
連通し、他端が前記第2の液室(19)に連通するオリ
フィス(11)を形成し、このオリフィス(11)は可
動部材(8)の回転位置に応じて長さ、断面積が変化す
ることを特徴とする液体封入式マウント。
1. A partition (4) comprising an annular fixing member (6) and a disk-shaped movable member (8) rotatably provided inside the fixing member (6), and the partition (4). ) Is fixed to the upper surface side of the partition wall, and an elastic body (2) forming a first liquid chamber (18) enclosing a liquid with the partition wall (4) and a peripheral edge on the lower surface side of the partition wall (4). A diaphragm (16) which is fixed to the partition wall and forms a second liquid chamber (19) in which a liquid is enclosed between the partition member (4) and the fixed member (6) and the movable member (8). An orifice (11) having one end communicating with the first liquid chamber (18) and the other end communicating with the second liquid chamber (19) is formed therebetween, and the orifice (11) is a movable member ( A liquid-filled mount characterized in that the length and cross-sectional area thereof change depending on the rotation position of 8).
JP4801693U 1993-09-03 1993-09-03 Liquid-filled mount Pending JPH0718046U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4801693U JPH0718046U (en) 1993-09-03 1993-09-03 Liquid-filled mount

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4801693U JPH0718046U (en) 1993-09-03 1993-09-03 Liquid-filled mount

Publications (1)

Publication Number Publication Date
JPH0718046U true JPH0718046U (en) 1995-03-31

Family

ID=12791517

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4801693U Pending JPH0718046U (en) 1993-09-03 1993-09-03 Liquid-filled mount

Country Status (1)

Country Link
JP (1) JPH0718046U (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010077990A (en) * 2008-09-24 2010-04-08 Tokai Rubber Ind Ltd Fluid-sealed vibration control device
DE112009001851T5 (en) 2008-12-18 2012-06-21 Tokai Rubber Industries, Ltd. Fluid-filled vibration damping device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010077990A (en) * 2008-09-24 2010-04-08 Tokai Rubber Ind Ltd Fluid-sealed vibration control device
DE112009001851T5 (en) 2008-12-18 2012-06-21 Tokai Rubber Industries, Ltd. Fluid-filled vibration damping device
DE112009001851B4 (en) * 2008-12-18 2014-07-10 Tokai Rubber Industries, Ltd. Fluid-filled vibration damping device
US9068625B2 (en) 2008-12-18 2015-06-30 Tokai Rubber Industries, Ltd. Fluid-filled type vibration damping device

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