JPH06280927A - Vibration control mount with liquid encapsulated - Google Patents

Abstract

PURPOSE:To enlarge the pressure receiving area for a rubber piece at each end in axial direction of an intermediate cylinder without causing cost-up or large size. CONSTITUTION:Together with an outer flange 31, an inner flange 32 is in the same direction formed in a single piece structure at each end in axial direction of an intenwediate cylinder 30 which is formed using a press, and the section of the end part is made in a channel form. In case a rubber piece 4 is elastically deformed on the basis of the relative displacement of the inner 1 and outer cylinders 2, the pressure receiving area of the inner flange part 32 as the receiving surface on the intermediate cylinder side is enlarged as much as possible.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は液体封入式防振マウント
に関し、特に自動車のサスペンション系やエンジンのマ
ウント部に用いられる円筒型ブッシュタイプの液体封入
式防振マウントに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid filled type vibration damping mount, and more particularly to a cylindrical bush type liquid filled type vibration damping mount used in a suspension system of an automobile or a mount portion of an engine.

【０００２】[0002]

【従来の技術】この種の液体封入式防振マウントとして
例えば図３〜図５に示す構造のものがある。この従来の
防振マウントは、偏心配置した内筒１と外筒２との間に
中間筒３が配設されているとともに、内筒１と中間筒３
との間にはゴム体４が介装されており、このゴム体４に
よって内筒１と中間筒３とが相互に連結されている。2. Description of the Related Art As a liquid-filled type vibration isolation mount of this type, there is one having a structure shown in FIGS. In this conventional vibration-proof mount, an intermediate cylinder 3 is arranged between an eccentrically arranged inner cylinder 1 and outer cylinder 2, and the inner cylinder 1 and the intermediate cylinder 3 are also arranged.
A rubber body 4 is interposed between the inner cylinder 1 and the intermediate cylinder 3 by the rubber body 4.

【０００３】そして、前記外筒２には、連設部５をはさ
んでその両側に窓部６が開口形成されており、これらの
窓部６には薄膜状のダイヤフラム７が内側に向かって袋
状に膨出するように予め一体に形成されている一方、ゴ
ム体４には前記ダイヤフラム７に対向する位置にそのダ
イヤフラム７側に向かって開口する凹状の空間部８が形
成されている。A window portion 6 is formed on each side of the outer tube 2 with the continuous portion 5 interposed therebetween, and a thin film diaphragm 7 is directed to the inside of the window portion 6. The rubber body 4 is integrally formed in advance so as to bulge into a bag shape. On the other hand, the rubber body 4 is provided with a concave space portion 8 that opens toward the diaphragm 7 side at a position facing the diaphragm 7.

【０００４】前記中間筒３には、その軸心方向両端部の
全周に沿って外フランジ部９が拡径方向に曲折形成され
ているとともに、この中間筒３のうち前記空間部８に対
応する部分については、前記軸心方向両端部を残して切
除されて窓部１０が開口形成されていて、その残された
部分が外フランジ部９と逆向きの内フランジ部１１とな
っている。Outer flange portions 9 are formed on the intermediate cylinder 3 along the entire circumference of both ends in the axial direction so as to bend in the radial direction, and correspond to the space portion 8 of the intermediate cylinder 3. As for the portion to be formed, the window portion 10 is opened by leaving the both ends in the axial direction, and the remaining portion is the inner flange portion 11 opposite to the outer flange portion 9.

【０００５】そして、前記中間筒３の外フランジ部９は
外筒２の内周面に直接接触しており、外筒２の軸心方向
両端部にかしめ加工を施すことによって、中間筒３と外
筒２とが不離一体に結合されている。The outer flange portion 9 of the intermediate cylinder 3 is in direct contact with the inner peripheral surface of the outer cylinder 2, and by crimping both ends of the outer cylinder 2 in the axial direction, the intermediate cylinder 3 and The outer cylinder 2 and the outer cylinder 2 are integrally connected.

【０００６】一方、前記ゴム体４の空間部８には、その
開口部側から図５に示すような仕切板１２が嵌合されて
その空間部８の開口縁部に弾接しており、これによって
前記空間部８がゴム体４側の第１の液室１３と外筒２側
もしくはダイヤフラム７側の第２の液室１４とに仕切ら
れている。On the other hand, a partition plate 12 as shown in FIG. 5 is fitted into the space portion 8 of the rubber body 4 from the opening side thereof and elastically contacts the opening edge portion of the space portion 8. The space 8 is partitioned by the first liquid chamber 13 on the rubber body 4 side and the second liquid chamber 14 on the outer cylinder 2 side or the diaphragm 7 side.

【０００７】前記仕切板１２は、図５に示すように、所
定の金属板により円弧状で且つ断面略ハット状に曲折形
成されているもので、そのフランジ部１５と切欠部１６
とを空間部８の開口縁部に弾接させることにより、前記
第１の液室１３と第２の液室１４とをシールしている。
なお、仕切板１２のフランジ部１５は、前記ゴム体４と
外筒２との間に圧締されている。As shown in FIG. 5, the partition plate 12 is formed by bending a predetermined metal plate into an arc shape and a cross-section substantially hat shape, and its flange portion 15 and notch portion 16 are formed.
The first liquid chamber 13 and the second liquid chamber 14 are sealed by elastically contacting and with the opening edge of the space 8.
The flange portion 15 of the partition plate 12 is clamped between the rubber body 4 and the outer cylinder 2.

【０００８】また、前記ゴム体４の外周面のうち内筒１
をはさんで前記空間部８と反対側には、その円周方向に
沿って略半円状をなす樹脂製のオリフィススリーブ１７
がはめ合わされている。そして、このオリフィススリー
ブ１７には例えばゴム体４の軸心方向に沿って蛇行する
単一もしくは複数のオリフィス通路１８が形成されてお
り、これによって第１の液室１３と第２の液室１４とが
互いに連通されているとともに、オリフィス通路１８を
含む第１，第２の液室１３，１４には例えば不凍液、シ
リコーンオイル等の非圧縮性の液体が封入されている。The inner cylinder 1 of the outer peripheral surface of the rubber body 4
On the side opposite to the space portion 8 with the space therebetween, a resin-made orifice sleeve 17 having a substantially semicircular shape along the circumferential direction thereof.
Are fitted together. The orifice sleeve 17 is formed with, for example, a single or a plurality of orifice passages 18 that meander along the axial direction of the rubber body 4, whereby the first liquid chamber 13 and the second liquid chamber 14 are formed. Are communicated with each other, and the first and second liquid chambers 13 and 14 including the orifice passage 18 are filled with an incompressible liquid such as antifreeze liquid or silicone oil.

【０００９】したがって、前記内筒１と外筒２との間に
その両者を径方向に相対変位させるように例えば図３，
４の上下方向の振動入力が加わると、ゴム体４が弾性変
形する一方で、第１の液室１３と第２の液室１４との間
でオリフィス通路１８を通じて液体が繰り返し流動し、
それに応じてダイヤフラム７が弾性変形することで振動
入力を減衰させることになる。Therefore, the inner cylinder 1 and the outer cylinder 2 are arranged so as to be relatively displaced in the radial direction between the inner cylinder 1 and the outer cylinder 2, for example, as shown in FIG.
When the vibration input in the vertical direction of 4 is applied, the rubber body 4 elastically deforms, while the liquid repeatedly flows between the first liquid chamber 13 and the second liquid chamber 14 through the orifice passage 18,
Accordingly, the diaphragm 7 is elastically deformed to attenuate the vibration input.

【００１０】なお、前記ゴム体４には内筒１の軸心方向
に貫通する空隙部１９が形成されているほか、突起部２
０，２１とが一体に形成されており、突起部２０と仕切
板１２との当接、ならびに突起部２１と着座面２２との
当接により、内筒１と外筒２（中間筒３）との間におけ
る図３，４の上下方向の過大入力を阻止するようになっ
ている（類似構造が例えば特開昭６３−３１８３３９号
公報および特開平３−１７７６３５号公報に開示されて
いる）。The rubber body 4 is formed with a void portion 19 penetrating in the axial direction of the inner cylinder 1 and the protrusion 2
0 and 21 are integrally formed, and the inner cylinder 1 and the outer cylinder 2 (intermediate cylinder 3) are formed by the contact between the protrusion 20 and the partition plate 12 and the contact between the protrusion 21 and the seating surface 22. 3 and 4 are prevented from being excessively input in the vertical direction (similar structures are disclosed in, for example, JP-A-63-318339 and JP-A-3-177635).

【００１１】[0011]

【発明が解決しようとする課題】上記のような従来の液
体封入式防振マウントにおいては、前記中間筒３のうち
窓部１０を形成することによって残された軸心方向両端
部の内フランジ部１１は、ゴム体４が弾性変形した場合
の受圧面として機能することから、この受圧面積の大小
が防振マウントの基本性能の上で大きな意味をもつこと
になる。In the conventional liquid-filled type vibration-damping mount as described above, the inner flange portions of both ends in the axial direction, which are left by forming the window portions 10 of the intermediate cylinder 3, are left. Since 11 functions as a pressure receiving surface when the rubber body 4 is elastically deformed, the size of this pressure receiving area has a great meaning in the basic performance of the vibration proof mount.

【００１２】しかしながら、図３，４に示した構造で
は、中間筒３自体がプレス成形法によって形成されたも
のであること、および外筒２との結合部となる外フラン
ジ部９に連続するように内フランジ部１１を形成する必
要があることから、内フランジ部１１の長さ（外筒２の
軸心方向での長さ）すなわち受圧面積の大きさにおのず
と制約があり、必要十分な受圧面積を確保することがで
きない。その結果、単にゴム体４の耐久性が乏しいばか
りでなく、ゴム体４自体の拡張弾性（拡張ばね作用）が
小さく、そのために振動減衰性能の上で重要なロスファ
クター（損失系数）のレベルを高くすることができず、
防振マウントとしての振動減衰性能の向上に限界があ
る。However, in the structure shown in FIGS. 3 and 4, the intermediate cylinder 3 itself is formed by the press molding method, and the intermediate cylinder 3 is connected to the outer flange portion 9 which is a connecting portion with the outer cylinder 2. Since it is necessary to form the inner flange portion 11 on the inner flange portion 11, the length of the inner flange portion 11 (the length in the axial direction of the outer cylinder 2), that is, the size of the pressure receiving area is naturally limited, and the necessary and sufficient pressure receiving The area cannot be secured. As a result, not only is the durability of the rubber body 4 poor, but the expansion elasticity (expansion spring action) of the rubber body 4 itself is small, and therefore the level of the loss factor (loss coefficient) important for vibration damping performance is reduced. I ca n’t make it higher,
There is a limit to the improvement of vibration damping performance as an anti-vibration mount.

【００１３】また、前記内フランジ部１１の長さすなわ
ちゴム体４に対する受圧面積を大きくすると、防振マウ
ント全体のサイズが大きくなってしまい、小型化に反す
る結果となって好ましくない。Further, if the length of the inner flange portion 11, that is, the pressure receiving area for the rubber body 4 is increased, the size of the entire vibration-damping mount becomes large, which is unfavorable for downsizing.

【００１４】一方、図３，４に示した防振マウントの中
間筒３はプレス成形法によって形成されたものである
が、これに代えて例えば図６に示すように中間筒２３を
鋳造あるいはダイカスト法によって所定形状に形成した
ものも一部で使用されている。しかしながら、鋳造ある
いはダイカスト法によって形成された中間筒２３は、ゴ
ム体４に対する必要十分な受圧面積を確保できるもの
の、プレス成形タイプのものに比べて大幅なコストアッ
プを招き、製造コストの面でなおも問題を残している。On the other hand, the intermediate cylinder 3 of the vibration-proof mount shown in FIGS. 3 and 4 is formed by a press molding method. Instead of this, for example, as shown in FIG. 6, the intermediate cylinder 23 is cast or die cast. Some of them are formed into a predetermined shape by the method. However, although the intermediate cylinder 23 formed by casting or die casting can secure a necessary and sufficient pressure receiving area for the rubber body 4, it causes a significant increase in cost as compared with the press-molding type, and is still in terms of manufacturing cost. Also left a problem.

【００１５】本発明は以上のような従来の課題に着目し
てなされたもので、中間筒の軸心方向両端部の断面形状
を改良することによって、防振マウント全体の大型化や
コストアップを招くことなく、中間筒の軸心方向両端部
でのゴム体に体する受圧面積を大きく確保できるように
した構造を提供するものである。The present invention has been made by paying attention to the above-mentioned conventional problems. By improving the cross-sectional shape of both ends of the intermediate cylinder in the axial direction, the overall size and cost of the anti-vibration mount can be increased. It is intended to provide a structure capable of ensuring a large pressure receiving area on the rubber body at both ends in the axial direction of the intermediate cylinder without inviting.

【００１６】[0016]

【課題を解決するための手段】本発明は内筒および外筒
と、これら内筒と外筒との間に設けられて軸心方向両端
部の外周が前記外筒に接触して結合される中間筒と、前
記内筒と中間筒との間に介装されてこれら両者を相互に
連結するゴム体と、このゴム体と外筒とで囲まれた領域
内に形成された弾性変形可能な二つの液室と、前記外筒
と中間筒との間に形成されて前記二つの液室を相互に連
通させるオリフィス通路とを備え、前記内筒と外筒との
径方向の相対変位に基づいて、二つの液室に封入された
液体をオリフィス通路を介して相互に流動させるように
した液体封入式防振マウントにおいて、前記中間筒の軸
心方向両端部を断面コ字状に曲折形成したことを特徴と
している。According to the present invention, an inner cylinder and an outer cylinder are provided between the inner cylinder and the outer cylinder, and the outer circumferences of both axial end portions are in contact with the outer cylinder. An intermediate cylinder, a rubber body that is interposed between the inner cylinder and the intermediate cylinder and connects these to each other, and elastically deformable formed in a region surrounded by the rubber body and the outer cylinder. Two liquid chambers and an orifice passage that is formed between the outer cylinder and the intermediate cylinder and connects the two liquid chambers to each other are provided, and based on the relative displacement in the radial direction between the inner cylinder and the outer cylinder. In the liquid-filled type vibration-proof mount in which the liquids enclosed in the two liquid chambers are caused to flow to each other through the orifice passage, both end portions in the axial direction of the intermediate cylinder are bent and formed in a U-shaped cross section. It is characterized by that.

【００１７】[0017]

【作用】この構造によると、中間筒の軸心方向両端部の
形状を断面コ字状にしたことにより、中間筒の軸心方向
両端部のゴム体に対する有効接触長さすなわち受圧面積
を大きく確保でき、しかも上記のコ字状断面形状はコス
ト的に有利なブレス成形法で容易に加工することができ
る。According to this structure, the axially opposite ends of the intermediate cylinder have a U-shaped cross section, so that a large effective contact length of the axially opposite ends of the intermediate cylinder with respect to the rubber body, that is, a pressure receiving area is secured. In addition, the above U-shaped cross-sectional shape can be easily processed by a cost-effective breath forming method.

【００１８】[0018]

【実施例】図１は本発明の一実施例を示す図で、図３，
４に示した従来例と共通する部分には同一符号を付して
ある。DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram showing an embodiment of the present invention.
The same parts as those of the conventional example shown in FIG.

【００１９】図１に示すように、ゴム体４に埋設される
かたちで内筒１と外筒２との間に配設された中間筒３０
は、その全体形状の上では従来のものと基本的に同一で
あるものの、軸心方向両端部の断面形状がコ字状に形成
されている点で従来のものと異なっている。As shown in FIG. 1, an intermediate cylinder 30 embedded in a rubber body 4 and disposed between an inner cylinder 1 and an outer cylinder 2.
Although it is basically the same as the conventional one in terms of its overall shape, it differs from the conventional one in that the cross-sectional shape of both ends in the axial direction is U-shaped.

【００２０】すなわち、前記中間筒３０は、円筒状の一
般部３０ａの軸心方向両端部を外側に折り返すことによ
って、前記外筒２との結合部となる外フランジ部３１が
その全周に沿って形成されている一方、前記一般部３０
ａのうちゴム体４側の空間部８に対応する部分に窓部１
０が開口形成されることによって残されたその一般部３
０ａの一部が内フランジ部３２としてウェブ３３を介し
て前記外フランジ部３１に連続しており、結果的に中間
筒３０はその軸心方向両端部が外フランジ部３１とウェ
ブ３３ならびに一般部３０ａもしくは内フランジ部３２
とによって互いに向き合うように断面コ字状に形成され
ているものである。That is, in the intermediate cylinder 30, both ends of the cylindrical general portion 30a in the axial direction are folded back to the outside, so that the outer flange portion 31 serving as a joint portion with the outer cylinder 2 extends along the entire circumference thereof. While being formed by the general portion 30
The window portion 1 is provided at a portion of a corresponding to the space portion 8 on the rubber body 4 side.
The general part 3 left by opening 0
A part of 0a is continuous as the inner flange portion 32 with the outer flange portion 31 via the web 33, and as a result, the intermediate cylinder 30 has its both axial ends in the outer flange portion 31, the web 33, and the general portion. 30a or inner flange 32
Are formed to have a U-shaped cross section so as to face each other.

【００２１】なお、上記の中間筒３０は従来の中間筒３
と同様にプレス成形法によって形成される。The intermediate cylinder 30 is the conventional intermediate cylinder 3.
It is formed by the press molding method similarly to

【００２２】したがって、本実施例構造によると、中間
筒３０の軸心方向両端部において、その中間筒３０と外
筒２との結合に必要な外フランジ部３１の長さを確保し
ながら、内フランジ部３２の長さとしても必要十分な長
さを確保できるようになり、ゴム体４に対する内フラン
ジ部３２の受圧面積が従来よりも大きくなる。Therefore, according to the structure of this embodiment, at both ends of the intermediate cylinder 30 in the axial center direction, while ensuring the length of the outer flange portion 31 required for connecting the intermediate cylinder 30 and the outer cylinder 2, It becomes possible to secure a necessary and sufficient length even for the length of the flange portion 32, and the pressure receiving area of the inner flange portion 32 against the rubber body 4 becomes larger than in the conventional case.

【００２３】その結果、内筒１と外筒２との相対変位に
基づいてゴム体４が圧縮変形した場合に、そのゴム体４
の拡張弾性が従来よりもおよそ１．３倍程度に大きくな
り、ひいてはロスファクターのレベルも高くなる。しか
も、内フランジ部３２における大きな受圧面積でゴム体
４の圧縮変形を受けることによって、ゴム体４自体の耐
久性も向上する。As a result, when the rubber body 4 is compressed and deformed due to the relative displacement between the inner cylinder 1 and the outer cylinder 2, the rubber body 4 is compressed.
The expansion elasticity of is about 1.3 times larger than the conventional one, and the level of loss factor is also increased. Moreover, the durability of the rubber body 4 itself is improved by the compression deformation of the rubber body 4 in the large pressure receiving area of the inner flange portion 32.

【００２４】図２は上記実施例構造と従来構造とについ
て、周波数に依存するロスファクターと動ばね定数の変
化を示したもので、同図から明らかなように本発明にお
ける上記実施例構造の方がロスファクターおよび動ばね
定数ともに高くなる。FIG. 2 shows changes in the loss factor and the dynamic spring constant depending on the frequency between the structure of the embodiment and the conventional structure. As is clear from the drawing, the structure of the embodiment of the present invention is better. Both the loss factor and the dynamic spring constant are high.

【００２５】[0025]

【発明の効果】以上のように本発明によれば、内筒と外
筒との間に設けられる中間筒の軸心方向両端部を断面コ
字状に曲折形成したことにより、中間筒をプレス成形法
で形成することを前提とした上で、防振マウントそのも
のの大型化を招くことなくゴム体に対する中間筒の受圧
面積を大きく確保できることから、ゴム体の拡張弾性が
高くなるとともに耐久性が向上し、振動減衰特性の上で
重要なロスファクターおよび動ばね定数がともに高くな
って防振マウントとしての振動減衰性能が向上する。As described above, according to the present invention, the intermediate cylinder provided between the inner cylinder and the outer cylinder is bent at both axial end portions in a U-shaped cross section so that the intermediate cylinder is pressed. Since it is possible to secure a large pressure receiving area of the intermediate cylinder against the rubber body without increasing the size of the anti-vibration mount itself, it is possible to increase the expansion elasticity of the rubber body and increase its durability. As a result, both the loss factor and the dynamic spring constant, which are important in terms of vibration damping characteristics, are increased, and the vibration damping performance of the vibration damping mount is improved.

【００２６】また、中間筒を鋳造あるいはダイカスト法
で形成した場合のようにコストアップを招くこともな
い。Further, there is no increase in cost unlike the case where the intermediate cylinder is formed by casting or die casting.

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

【図１】本発明の一実施例を示す全断面説明図。FIG. 1 is an overall cross sectional view showing an embodiment of the present invention.

【図２】ロスファクターと動ばね定数の変化を示す特性
説明図。FIG. 2 is a characteristic explanatory view showing changes in a loss factor and a dynamic spring constant.

【図３】従来の液体封入式防振マウントの一例を示す断
面説明図。FIG. 3 is an explanatory cross-sectional view showing an example of a conventional liquid-filled vibration damping mount.

【図４】図３のＡ−Ａ線に沿う断面説明図。4 is a cross-sectional explanatory view taken along the line AA of FIG.

【図５】図３の要部の分解斜視図。5 is an exploded perspective view of a main part of FIG.

【図６】従来の液体封入式防振マウントの他の例を示す
断面説明図。FIG. 6 is a cross-sectional explanatory view showing another example of a conventional liquid-filled type vibration damping mount.

【符号の説明】[Explanation of symbols]

１…内筒 ２…外筒 ３…中間筒 ４…ゴム体 ７…ダイヤフラム １２…仕切板 １３…第１の液室 １４…第２の液室 １８…オリフィス通路 ３０…中間筒 ３１…外フランジ部 ３２…内フランジ部 1 ... Inner cylinder 2 ... Outer cylinder 3 ... Intermediate cylinder 4 ... Rubber body 7 ... Diaphragm 12 ... Partition plate 13 ... First liquid chamber 14 ... Second liquid chamber 18 ... Orifice passage 30 ... Intermediate cylinder 31 ... Outer flange part 32 ... Inner flange

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】 内筒および外筒と、これら内筒と外筒と
の間に設けられて軸心方向両端部の外周が前記外筒に接
触して結合される中間筒と、前記内筒と中間筒との間に
介装されてこれら両者を相互に連結するゴム体と、この
ゴム体と外筒とで囲まれた領域内に形成された弾性変形
可能な二つの液室と、前記外筒と中間筒との間に形成さ
れて前記二つの液室を相互に連通させるオリフィス通路
とを備えてなり、 前記内筒と外筒との径方向の相対変位に基づいて、二つ
の液室に封入された液体をオリフィス通路を介して相互
に流動させるようにした液体封入式防振マウントにおい
て、 前記中間筒の軸心方向両端部を断面コ字状に曲折形成し
たことを特徴とする液体封入式防振マウント。1. An inner cylinder and an outer cylinder, an intermediate cylinder which is provided between the inner cylinder and the outer cylinder, and whose outer circumferences at both axial ends are in contact with and joined to the outer cylinder, and the inner cylinder. A rubber body that is interposed between the intermediate cylinder and the intermediate cylinder to connect them to each other; two elastically deformable liquid chambers formed in a region surrounded by the rubber body and the outer cylinder; An orifice passage that is formed between an outer cylinder and an intermediate cylinder and connects the two liquid chambers to each other. Based on the radial relative displacement between the inner cylinder and the outer cylinder, the two liquids are A liquid-filled type vibration-proof mount in which liquids filled in a chamber are caused to flow to each other through an orifice passage, wherein both end portions in the axial direction of the intermediate cylinder are bent to have a U-shaped cross section. Liquid-filled anti-vibration mount.