JPH0754909A - Liquid encapsulated bushing and its manufacture - Google Patents
Liquid encapsulated bushing and its manufactureInfo
- Publication number
- JPH0754909A JPH0754909A JP20415593A JP20415593A JPH0754909A JP H0754909 A JPH0754909 A JP H0754909A JP 20415593 A JP20415593 A JP 20415593A JP 20415593 A JP20415593 A JP 20415593A JP H0754909 A JPH0754909 A JP H0754909A
- Authority
- JP
- Japan
- Prior art keywords
- cylinder
- liquid
- diameter
- seal rubber
- rubber
- 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.)
- Granted
Links
Landscapes
- Combined Devices Of Dampers And Springs (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、液体封入ブッシュ及び
その製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid-filled bush and its manufacturing method.
【０００２】[0002]
【従来の技術】液体封入ブッシュは、自動車におけるサ
スペンションの車体への支持等に用いられている。その
一般的な構造は、互いに外側と内側とに配置された外筒
と内筒との間にゴムスリーブが介装されているととも
に、該ゴムスリーブと外筒との間に液体を収容する複数
の液室が周方向に間隔をおいて形成され、これら液室が
オリフィスによって結ばれたものになっている。さら
に、ゴムスリーブの外周面には中間筒が固着され、該中
間筒と外筒との間にシールゴムが設けられている液体封
入ブッシュも一般に知られている。2. Description of the Related Art Liquid-filled bushes are used for supporting suspensions of automobiles on vehicle bodies. The general structure is such that a rubber sleeve is interposed between an outer cylinder and an inner cylinder, which are arranged on the outer side and the inner side, and a plurality of liquid containers are housed between the rubber sleeve and the outer cylinder. Liquid chambers are formed at intervals in the circumferential direction, and these liquid chambers are connected by an orifice. Further, a liquid-filled bush in which an intermediate cylinder is fixed to the outer peripheral surface of the rubber sleeve and a seal rubber is provided between the intermediate cylinder and the outer cylinder is generally known.
【０００３】例えば、特開平３−１４４１３５号公報に
は、このような液体封入ブッシュの組立方法が記載され
ている。それは、内筒の上部にゴムスリーブが固着され
てなるインナ部材と、外筒の下部にゴムスリーブが固着
されてなるアウタ部材とを形成し、インナ部材をアウタ
部材に圧入していく途中の段階でこの両部材間の隙間か
ら液体を内部に注入し、圧入完了後に上記外筒に縮径加
工を施すことにより、当該インナ部材とアウタ部材とを
一体化する、というものである。For example, Japanese Patent Laid-Open No. 3-144135 discloses a method of assembling such a liquid-filled bush. It is a step in the process of forming an inner member with a rubber sleeve fixed to the upper part of the inner cylinder and an outer member with a rubber sleeve fixed to the lower part of the outer cylinder, and pressing the inner member into the outer member. Then, the liquid is injected into the interior through the gap between the two members, and after the press-fitting is completed, the outer cylinder is subjected to a diameter reduction process to integrate the inner member and the outer member.
【０００４】[0004]
【発明が解決しようとする課題】しかし、上述の如く外
筒に縮径加工を施してインナ部材とアウタ部材とを一体
化した場合、該縮径によって液室の容積が小さくなるた
め、その液圧が上昇してインナ部材とアウタ部材との間
から液体が洩れる、あるいはゴムスリーブが破れるとい
う問題がある。この問題はゴムスリーブのバネ定数が例
えば５００kgf/mm以上というように高い場合に特に顕著
になる。すなわち、ゴムスリーブのバネ定数が低い場合
には、該ゴムスリーブの膨出変形によって上記液圧の上
昇が抑えられるが、そのバネ定数が高い場合にはかかる
変形が小さいことから上記液圧が上昇したままとなり、
上記液洩れ等を生ずるに至るものである。However, when the outer cylinder is subjected to the diameter reduction processing to integrate the inner member and the outer member as described above, the volume of the liquid chamber is reduced due to the diameter reduction, so that the liquid There is a problem that the pressure rises and liquid leaks between the inner member and the outer member, or the rubber sleeve breaks. This problem becomes particularly noticeable when the spring constant of the rubber sleeve is as high as 500 kgf / mm or more. That is, when the spring constant of the rubber sleeve is low, the rise of the hydraulic pressure is suppressed by the bulging deformation of the rubber sleeve, but when the spring constant is high, the deformation is small and the hydraulic pressure rises. Left as it is,
The above-mentioned liquid leakage may occur.
【０００５】[0005]
【課題を解決するための手段】本発明は、上記中間筒の
外径及びシールゴムの肉厚に工夫を加えて、上記縮径加
工によって上記液圧の上昇を生じないようにした液体封
入ブッシュ及びその製造方法を請求するものである。SUMMARY OF THE INVENTION The present invention provides a liquid-sealed bush in which the outer diameter of the intermediate cylinder and the thickness of the seal rubber are modified so as to prevent the hydraulic pressure from increasing due to the diameter reduction. Claiming the manufacturing method.
【０００６】すなわち、上記課題を解決する第１の手段
（請求項１に記載の発明）は、互いに間隔をおいて外側
と内側とに配置された外筒及び内筒と、該内筒の外周面
に設けられたゴム部と、該ゴム部の外周面に開口し上記
外筒との間に液室を形成する凹部と、該凹部を挾んで軸
方向の一方側及び他方側の各ゴム部外周面に設けられた
第１及び第２の各中間筒部と、上記液室を密封するよう
上記外筒と第１及び第２の各中間筒部との間に介装され
た第１及び第２の各シールゴム部とを備え、上記液室に
減衰媒体としての液体が収容された液体封入ブッシュで
あって、上記第１中間筒部は上記第２中間筒部よりも外
径が大きく形成され、上記外筒は上記第１中間筒部に対
応する部位の内径と上記第２中間筒部に対応する部位の
内径とが実質的に同一に形成されていて、上記第１及び
第２の各シールゴム部は、上記第１中間筒部と第２中間
筒部との外径差よりも大きな肉厚差でもって第１シール
ゴム部の方が薄く第２シールゴム部の方が厚く設けられ
て、第１シールゴム部のバネ定数が第２シールゴム部の
バネ定数よりも高くなるよう上記外筒の縮径によって第
１及び第２の各中間筒部と外筒との間に加圧挟持されて
いることを特徴とするものである。That is, the first means for solving the above-mentioned problems (the invention according to claim 1) is to provide an outer cylinder and an inner cylinder which are arranged at an outer side and an inner side with a space therebetween, and an outer circumference of the inner cylinder. A rubber portion provided on the surface, a concave portion that opens on the outer peripheral surface of the rubber portion and forms a liquid chamber between the outer cylinder and the rubber portion on one side and the other side in the axial direction across the concave portion. First and second intermediate cylinders provided on the outer peripheral surface, and first and second intermediate cylinders interposed between the outer cylinder and the first and second intermediate cylinders so as to seal the liquid chamber. A liquid sealing bush having a second seal rubber portion and containing a liquid as a damping medium in the liquid chamber, wherein the first intermediate cylinder portion has a larger outer diameter than the second intermediate cylinder portion. In the outer cylinder, the inner diameter of the portion corresponding to the first intermediate cylinder portion and the inner diameter of the portion corresponding to the second intermediate cylinder portion are substantially The first and second seal rubber portions are formed in one, and the first seal rubber portion has a thickness difference larger than an outer diameter difference between the first intermediate cylinder portion and the second intermediate cylinder portion. Is thin and the second seal rubber portion is thicker, and the first and second intermediate cylinders are contracted by reducing the diameter of the outer cylinder so that the spring constant of the first seal rubber portion becomes higher than that of the second seal rubber portion. It is characterized in that it is sandwiched under pressure between the section and the outer cylinder.
【０００７】ここに、上記第１中間筒部と第２中間筒部
とは互いに連なったものであっても別体のものであって
もよい。前者の場合、中間筒における上記凹部に相当す
る部位に筒壁を貫通する窓を形成すればよく、該窓を挾
んで軸方向の一方側の部位が第１中間筒部となり、他方
側の部位が第２中間筒部となる。この点は以下に述べる
他の手段においても同様である。Here, the first intermediate cylinder portion and the second intermediate cylinder portion may be connected to each other or may be separate bodies. In the former case, a window penetrating the cylinder wall may be formed in a portion corresponding to the recess in the intermediate cylinder, and one portion in the axial direction across the window serves as the first intermediate cylinder portion and the other portion. Is the second intermediate cylinder part. This point also applies to other means described below.
【０００８】上記課題を解決する第２の手段（請求項２
に記載の発明）は、互いに間隔をおいて外側と内側とに
配置された外筒及び内筒と、該内筒の外周面に設けられ
たゴム部と、該ゴム部の外周面に開口し上記外筒との間
に液室を形成する凹部と、該凹部を挾んで軸方向の一方
側及び他方側の各ゴム部外周面に設けられた第１及び第
２の各中間筒部と、上記液室を密封するよう上記外筒と
第１及び第２の各中間筒部との間に介装された第１及び
第２の各シールゴム部とを備え、上記液室に減衰媒体と
しての液体が収容された液体封入ブッシュの製造方法で
あって、上記第１中間筒部をその外径が第２中間筒部の
外径よりも大きくなるように形成し、上記内筒と上記第
１及び第２の中間筒部との間に上記ゴム部を設ける一
方、該第１及び第２の中間筒部の各外周面に第１及び第
２の各シールゴム部を第１シールゴム部の外径の方が第
２シールゴム部の外径よりも小径になるように設けてな
る中間品を製作し、上記中間品を内径が軸方向の全長に
わたって実質的に同一に形成された外筒に圧入すること
によって上記液室を形成するとともに、該液室に上記液
体を入れ、上記外筒の外径を上記第２中間筒部側の端部
から上記第１中間筒部側の端部へと次第に狭めていく縮
径加工を行なうことにより、上記液室の容積の減少分に
相当する液体を該液室から上記第１シールゴム部と当該
外筒との間を通して流出させて、上記中間品と外筒とを
一体化することを特徴とするものである。A second means for solving the above problems (claim 2)
The invention described in 1), the outer cylinder and the inner cylinder are arranged at a distance from each other on the outer side and the inner side, a rubber portion provided on the outer peripheral surface of the inner cylinder, and an opening on the outer peripheral surface of the rubber portion. A concave portion that forms a liquid chamber between the outer cylinder and the first and second intermediate cylindrical portions that are provided on the outer peripheral surfaces of the rubber portions on one side and the other side in the axial direction across the concave portion, The liquid chamber is provided with first and second seal rubber parts interposed between the outer cylinder and the first and second intermediate cylinder parts so as to seal the liquid chamber. A method for manufacturing a liquid-filled bush containing liquid, wherein the first intermediate cylinder portion is formed such that its outer diameter is larger than the outer diameter of the second intermediate cylinder portion, and the inner cylinder and the first intermediate cylinder portion are formed. The rubber portion is provided between the first and second intermediate tubular portions, and the first and second seal rubber portions are provided on the outer peripheral surfaces of the first and second intermediate tubular portions. An intermediate product is manufactured in which the outer diameter of the first seal rubber portion is smaller than the outer diameter of the second seal rubber portion, and the intermediate product is formed such that the inner diameter is substantially the same over the entire axial length. The liquid chamber is formed by press-fitting into the outer cylinder, and the liquid is introduced into the liquid chamber, and the outer diameter of the outer cylinder is changed from the end on the second intermediate cylinder portion side to the first intermediate cylinder portion. By performing a diameter reduction process that gradually narrows to the end on the side, the liquid corresponding to the decrease in the volume of the liquid chamber is caused to flow out from the liquid chamber through the space between the first seal rubber portion and the outer cylinder. In addition, the intermediate product and the outer cylinder are integrated.
【０００９】上記課題を解決する第３の手段（請求項３
に記載の発明）は、上記第２の手段において、上記第１
シールゴム部の外径を、上記縮径加工前の外筒の内径よ
りも小径に形成するようにした点に特徴がある。A third means for solving the above problems (claim 3)
In the second aspect, the invention described in
It is characterized in that the outer diameter of the seal rubber portion is smaller than the inner diameter of the outer cylinder before the diameter reduction processing.
【００１０】上記課題を解決する第４の手段（請求項４
に記載の発明）は、互いに間隔をおいて外側と内側とに
配置された外筒及び内筒と、該内筒の外周面に設けられ
たゴム部と、該ゴム部の外周面に開口し上記外筒との間
に液室を形成する凹部と、該凹部を挾んで軸方向の一方
側及び他方側の各ゴム部外周面に設けられた第１及び第
２の各中間筒部と、上記液室を密封するよう上記外筒と
第１及び第２の各中間筒部との間に介装された第１及び
第２の各シールゴム部とを備え、上記液室に減衰媒体と
しての液体が収容された液体封入ブッシュの製造方法で
あって、上記第１中間筒部をその外径が第２中間筒部の
外径よりも大きくなるように形成し、上記内筒と第１及
び第２の中間筒部との間に上記ゴム部を設けてなる内側
中間品を製作する一方、内径が軸方向の全長にわたって
実質的に同一に形成された外筒の内周面に、第１及び第
２の各シールゴム部を、第１シールゴム部の内径の方が
第２シールゴム部の内径よりも大径になるように、且つ
該両シールゴム部の内径差が上記第１中間筒部と第２中
間筒部との外径差よりも大きくなるように設けてなる外
側中間品を製作し、上記内側中間品を外側中間品に圧入
して上記液室を形成するとともに、該液室に上記液体を
入れ、上記外筒の外径を上記第２中間筒部側の端部から
上記第１中間筒部側の端部へと次第に狭めていく縮径加
工を行なうことにより、上記液室の容積の減少分に相当
する液体を該液室から上記第１シールゴム部と当該外筒
との間を通して流出させて、上記内側中間品と外側中間
品とを一体化することを特徴とする。A fourth means for solving the above problems (claim 4)
The invention described in 1), the outer cylinder and the inner cylinder are arranged at a distance from each other on the outer side and the inner side, a rubber portion provided on the outer peripheral surface of the inner cylinder, and an opening on the outer peripheral surface of the rubber portion. A concave portion that forms a liquid chamber between the outer cylinder and the first and second intermediate cylindrical portions that are provided on the outer peripheral surfaces of the rubber portions on one side and the other side in the axial direction across the concave portion, The liquid chamber is provided with first and second seal rubber parts interposed between the outer cylinder and the first and second intermediate cylinder parts so as to seal the liquid chamber. A method of manufacturing a liquid-filled bush containing a liquid, wherein the first intermediate cylinder portion is formed such that its outer diameter is larger than the outer diameter of the second intermediate cylinder portion, While manufacturing the inner intermediate product in which the rubber part is provided between the second intermediate cylinder part and the second intermediate cylinder part, the inner diameter is substantially the same over the entire axial length. Each of the first and second seal rubber parts is provided on the inner peripheral surface of the outer cylinder so that the inner diameter of the first seal rubber part is larger than that of the second seal rubber part. Is manufactured so that the difference in inner diameter between the first intermediate cylinder portion and the second intermediate cylinder portion is larger than the outer diameter difference between the first intermediate cylinder portion and the second intermediate cylinder portion. While forming the liquid chamber, the liquid is put into the liquid chamber, and the outer diameter of the outer cylinder is gradually narrowed from the end portion on the second intermediate cylinder portion side to the end portion on the first intermediate cylinder portion side. By performing the diameter reduction process, a liquid corresponding to the decrease in the volume of the liquid chamber is caused to flow out from the liquid chamber through the space between the first seal rubber portion and the outer cylinder, and the inner intermediate product and the outer intermediate product. It is characterized by integrating and.
【００１１】上記課題を解決する第５の手段（請求項５
に記載の発明）は、上記第４の手段において、上記縮径
加工前における外側中間品の第１シールゴム部の内径を
上記第１中間筒部の外径よりも大径に形成するようにし
た点に特徴がある。Fifth means for solving the above problems (claim 5)
In the fourth means, the inner diameter of the first seal rubber portion of the outer intermediate product before the diameter reduction processing is formed to be larger than the outer diameter of the first intermediate tubular portion. The point is characteristic.
【００１２】上記課題を解決する第６の手段（請求項６
に記載の発明）は、上記第２乃至第５の各手段におい
て、上記縮径加工を上記液室用の液中で行なうようにし
た点に特徴がある。A sixth means for solving the above problems (claim 6)
The invention described in 1) is characterized in that, in each of the second to fifth means, the diameter reducing process is performed in the liquid for the liquid chamber.
【００１３】[0013]
【作用】上記第１の手段においては、第１中間筒部と外
筒との隙間は第２中間筒部と外筒との隙間よりも狭くな
っているが、第１及び第２のシールゴム部は上記第１中
間筒部と第２中間筒部の外径差よりも大きな肉厚差でも
って第１シールゴム部の方が薄くなっている。よって、
外筒を縮径させる前に第１シールゴム部と外筒との間、
あるいは第１シールゴム部を先に外筒に固着しておく場
合には該シールゴム部と第１中間筒部との間に、外筒の
縮径時に液室の液体が洩れ出ることができる隙間を形成
することでき、以下に述べる第２乃至第６の各手段に係
る製造方法を採用して液圧の上昇を防止することが可能
になる。In the first means, the gap between the first intermediate cylinder portion and the outer cylinder is narrower than the gap between the second intermediate cylinder portion and the outer cylinder, but the first and second seal rubber portions are provided. The first seal rubber portion is thinner due to the thickness difference larger than the outer diameter difference between the first intermediate cylinder portion and the second intermediate cylinder portion. Therefore,
Before reducing the diameter of the outer cylinder, between the first seal rubber portion and the outer cylinder,
Alternatively, when the first seal rubber portion is first fixed to the outer cylinder, there is a gap between the seal rubber portion and the first intermediate cylinder portion that allows the liquid in the liquid chamber to leak when the outer cylinder is reduced in diameter. It can be formed, and it becomes possible to prevent the rise of the liquid pressure by adopting the manufacturing methods according to the second to sixth means described below.
【００１４】そして、上記第１及び第２シールゴム部
は、第１シールゴム部のバネ定数が第２シールゴム部の
バネ定数よりも高くなるよう外筒の縮径によって第１及
び第２の各中間筒部と外筒との間に加圧挟持されている
から、第１シールゴム部が薄くとも上記液体の洩れは防
がれ、しかも、当該ブッシュに過大な荷重が入っても、
外筒内における第１中間筒部の実質的な変位をなくすこ
とができ、減衰特性の向上を図る上で有利になる。The first and second seal rubber parts are arranged such that the spring constant of the first seal rubber part is higher than the spring constant of the second seal rubber part by reducing the diameter of the outer cylinder. Since the first seal rubber portion is thin, since the liquid is prevented from leaking because it is sandwiched under pressure between the portion and the outer cylinder, even if an excessive load is applied to the bush,
Substantial displacement of the first intermediate cylinder portion in the outer cylinder can be eliminated, which is advantageous in improving damping characteristics.
【００１５】上記第２の手段においては、第１中間筒部
の外径を第２中間筒部の外径よりも大きくしているが、
シールゴムの外径については第１シールゴム部側の方を
小径にしているから、中間品を外筒に圧入した段階では
第１シールゴム部と外筒との間に隙間を形成すること、
もしくは該第１中間筒部と外筒との間のシール性が低い
状態にすることができる。In the second means, the outer diameter of the first intermediate tubular portion is made larger than that of the second intermediate tubular portion.
Regarding the outer diameter of the seal rubber, the diameter on the side of the first seal rubber portion is made smaller. Therefore, when the intermediate product is press-fitted into the outer cylinder, a gap should be formed between the first seal rubber portion and the outer cylinder.
Alternatively, the sealing property between the first intermediate cylinder portion and the outer cylinder can be made low.
【００１６】そうして、かかる状態において、上記外筒
の外径を上記第２中間筒部側の端部から上記第１中間筒
部側の端部へと次第に狭めていく縮径加工を行なうよう
にしているから、該縮径加工によって液室の容積が減少
するものの、該液室容積の減少分に相当する液体を該液
室から上記第１シールゴム部と外筒との間を通して流出
させることができる。よって、上記液室の液圧の実質的
な増大を招くことなく上記縮径加工が完了して外筒と中
間品とを一体化することができる。In such a state, the outer diameter of the outer cylinder is gradually reduced from the end portion on the second intermediate cylinder portion side to the end portion on the first intermediate cylinder portion side. Therefore, although the volume of the liquid chamber is reduced by the diameter reducing process, the liquid corresponding to the reduced volume of the liquid chamber is caused to flow out from the liquid chamber through the space between the first seal rubber portion and the outer cylinder. be able to. Therefore, the diameter reduction process is completed and the outer cylinder and the intermediate product can be integrated with each other without substantially increasing the hydraulic pressure of the liquid chamber.
【００１７】上記第３の手段においては、上記第１シー
ルゴム部の外径が縮径加工前の外筒の内径よりも小さい
から、上記中間品を外筒に圧入した段階では第１シール
ゴム部と外筒との間に確実に隙間を形成することがで
き、上記液圧上昇を防止しながら縮径加工を行なう上で
有利になる。In the third means, since the outer diameter of the first seal rubber portion is smaller than the inner diameter of the outer cylinder before the diameter-reducing process, the first seal rubber portion becomes the first seal rubber portion when the intermediate product is press-fitted into the outer cylinder. A gap can be reliably formed with the outer cylinder, which is advantageous in performing diameter reduction processing while preventing the above hydraulic pressure rise.
【００１８】上記第４の手段においては、シールゴムを
中間筒部側ではなく外筒側に設けているが、該シールゴ
ムの内径は、上記第１シールゴム部の方が第２シールゴ
ム部よりも大径になるように、且つ両シールゴム部の内
径差が上記第１中間筒部と第２中間筒部との外径差より
も大きくなるようにしている。よって、内側中間品を外
側中間品に圧入した段階において、第１中間筒部と第１
シールゴム部との間に隙間を形成すること、もしくは該
第１中間筒部と外筒との間のシール性が低い状態にする
ことができ、上記第２の手段の場合と同様に液室から余
分な液体を流出させながら、外筒の縮径加工を行なうこ
とができる。In the fourth means, the seal rubber is provided on the outer cylinder side rather than the intermediate cylinder portion side. The inner diameter of the seal rubber is larger in the first seal rubber portion than in the second seal rubber portion. In addition, the inner diameter difference between both seal rubber portions is larger than the outer diameter difference between the first intermediate cylinder portion and the second intermediate cylinder portion. Therefore, when the inner intermediate product is press-fitted into the outer intermediate product,
It is possible to form a gap between the seal rubber portion and the sealability between the first intermediate cylinder portion and the outer cylinder, and to remove the gap from the liquid chamber as in the case of the second means. It is possible to reduce the diameter of the outer cylinder while letting out excess liquid.
【００１９】上記５の手段においては、縮径加工前の第
１シールゴム部の内径を上記第１中間筒部の外径よりも
大径に形成するようにしているから、上記内側中間品を
外側中間品に圧入した段階では第１中間筒部と第１シー
ルゴム部との間に確実に隙間を形成することができ、第
３の手段の場合と同様に上記液圧上昇を防止しながら縮
径加工を行なう上で有利になる。In the fifth means, the inner diameter of the first seal rubber portion before the diameter-reducing process is formed to be larger than the outer diameter of the first intermediate tubular portion, so that the inner intermediate product is placed outside. At the stage of press-fitting into the intermediate product, a gap can be surely formed between the first intermediate tubular portion and the first seal rubber portion, and as in the case of the third means, the diameter is reduced while preventing the hydraulic pressure from increasing. It is advantageous for processing.
【００２０】上記第６の手段においては、上記縮径加工
を液室用の液中で行なうから、上記液室から余分な液体
が流出する際に該液室に空気が入ることを防止すること
ができる。In the sixth means, since the diameter reducing process is performed in the liquid for the liquid chamber, it is possible to prevent air from entering the liquid chamber when excess liquid flows out from the liquid chamber. You can
【００２１】[0021]
【発明の効果】従って、上記第１乃至第６の各手段（請
求項１乃至請求項６の各発明）によれば、液室の液圧の
上昇を招くことなく、当該液体封入ブッシュを製作する
ことができ、液室のシール性の向上を図り、減衰特性の
向上を図る上で有利になる。Therefore, according to the first to sixth means (the inventions of claims 1 to 6), the liquid-filled bush is manufactured without increasing the hydraulic pressure of the liquid chamber. This is advantageous in improving the sealing property of the liquid chamber and improving the damping characteristic.
【００２２】特に第３及び第５の各手段によれば、外筒
の縮径加工前の段階で第１シールゴム部と外筒との間、
または第１シールゴム部と第１中間筒部との間に隙間が
形成されるようにしたから、縮径加工時に液室から余分
な液体を円滑に流出させる上で有利になり、また、第６
の手段によれば、上記縮径加工を液中で行なうようにし
たから、上記液室への空気の侵入を確実に防ぐことがで
き、減衰特性の向上を図る上で有利になる。In particular, according to the third and fifth means, between the first seal rubber portion and the outer cylinder, before the diameter reduction processing of the outer cylinder,
Alternatively, since the gap is formed between the first seal rubber portion and the first intermediate tubular portion, it is advantageous in smoothly flowing out the excess liquid from the liquid chamber during the diameter reduction processing.
According to the above means, since the diameter reducing process is performed in the liquid, it is possible to reliably prevent the invasion of air into the liquid chamber, which is advantageous in improving the damping characteristic.
【００２３】[0023]
【実施例】以下、本発明の実施例を図面に基づいて説明
する。Embodiments of the present invention will be described below with reference to the drawings.
【００２４】＜実施例１＞ −全体構造− 図１及び図２に示す液体封入ブッシュにおいて、１はサ
スペンション部材等の取付孔に嵌められる外筒、２は軸
部材が嵌挿される内筒、３は外筒１と内筒２との間に設
けられた中間筒である。これら筒１〜３は、剛性が高い
金属材料（プラスチック材料でもよい）によって形成さ
れていて、且つ互いに同心状に設けられている（なお、
外筒１と内筒２とは互いに偏心状態に配置してもよ
い）。上記外筒１と中間筒３との間にはシールゴム４が
設けられ、上記内筒２と中間筒３との間にはゴム部５が
設けられている。<Embodiment 1> -Overall structure-In the liquid-filled bushes shown in FIGS. 1 and 2, 1 is an outer cylinder fitted in a mounting hole of a suspension member or the like, 2 is an inner cylinder fitted with a shaft member, 3 Is an intermediate cylinder provided between the outer cylinder 1 and the inner cylinder 2. These cylinders 1 to 3 are made of a highly rigid metal material (may be a plastic material) and are provided concentrically with each other (note that
The outer cylinder 1 and the inner cylinder 2 may be eccentrically arranged with respect to each other. A seal rubber 4 is provided between the outer cylinder 1 and the intermediate cylinder 3, and a rubber portion 5 is provided between the inner cylinder 2 and the intermediate cylinder 3.
【００２５】上記外筒１の内径は軸方向の全長にわたっ
て同じである。上記中間筒３は、図３に示すように、そ
の筒軸方向の中間部位に筒壁を貫通する２つの窓部３
ａ，３ａを直径方向に対向させて備え、窓部３ａ，３ａ
を挾んで筒軸方向の一方側（上側）が第１中間筒部３ｂ
に形成され、他方側（下側）が第２中間筒部３ｃに形成
されている。すなわち、中間筒３の内径はその軸方向の
全長にわたって同じであるが、第１中間筒部３ｂは他の
部位よりも厚肉に形成されてその外径が大きくなってい
るものである。The inner diameter of the outer cylinder 1 is the same over the entire length in the axial direction. As shown in FIG. 3, the intermediate cylinder 3 has two window portions 3 penetrating the cylinder wall at an intermediate portion in the cylinder axis direction.
a and 3a are provided to face each other in the diametrical direction, and the window portions 3a and 3a are provided.
And the one side (upper side) in the cylinder axis direction is the first intermediate cylinder portion 3b.
And the other side (lower side) is formed in the second intermediate tubular portion 3c. That is, the inner diameter of the intermediate cylinder 3 is the same over the entire length in the axial direction, but the first intermediate cylinder part 3b is formed thicker than the other parts and has a larger outer diameter.
【００２６】上記シールゴム４は、上記中間筒３の外周
面に加硫接着されていて、該中間筒３の各窓部３ａに対
応する窓部を有し、上記第１中間筒部３ｂの外周部位が
第１シールゴム部４ａに形成され、上記第２中間筒部３
ｃの外周部位が第２シールゴム部４ｂに形成されてい
る。上記ゴム部５はその内周面が上記内筒２に、外周面
が上記中間筒３の内周面にそれぞれ加硫接着されてい
て、該中間筒３の各窓部３ａに開口するポケット（凹
部）５ａを備えており、上記中間筒３及びシールゴム４
の各窓部と共に、上記外筒１の内周面との間に液体（シ
リコーンオイルやグリコール等）を収容する液室６，６
を形成している。The seal rubber 4 is vulcanized and adhered to the outer peripheral surface of the intermediate cylinder 3, has a window portion corresponding to each window portion 3a of the intermediate cylinder 3, and has an outer periphery of the first intermediate cylinder portion 3b. The portion is formed in the first seal rubber portion 4a, and the second intermediate tubular portion 3 is formed.
The outer peripheral portion of c is formed in the second seal rubber portion 4b. The inner peripheral surface of the rubber portion 5 is vulcanized and adhered to the inner peripheral surface of the intermediate cylinder 3 and the outer peripheral surface thereof is vulcanized and adhered to the inner peripheral surface of the intermediate cylinder 3. (Recessed portion) 5a, and the intermediate cylinder 3 and the seal rubber 4 are provided.
Liquid chambers 6, 6 for accommodating a liquid (silicone oil, glycol, etc.) between the inner peripheral surface of the outer cylinder 1 and the respective window portions.
Is formed.
【００２７】上記内筒２の外周面には、上記液室６，６
に突出し外筒１と内筒との間に所定値以上の筒軸に直交
する方向の相対荷重が作用した際に外筒１の内周面に当
たるストッパ８が固定されている。このストッパ８は、
上記外側及び内側の両ゴム部４，５の過度の変形による
損傷を防止するためのものである。本例の場合、上記ゴ
ム部５が上記ストッパ８をくるんでいて、ストッパ８と
外筒１とが直接衝突することがないように構成されてい
る。また、上記シールゴム４とゴム部５とは上記中間筒
３の窓３ａを介して連続している。On the outer peripheral surface of the inner cylinder 2, the liquid chambers 6, 6 are provided.
A stopper 8 is fixed between the outer cylinder 1 and the inner cylinder, which comes into contact with the inner peripheral surface of the outer cylinder 1 when a relative load of a predetermined value or more in a direction orthogonal to the cylinder axis is applied. This stopper 8
The purpose is to prevent damage due to excessive deformation of both the outer and inner rubber portions 4 and 5. In the case of this example, the rubber portion 5 surrounds the stopper 8 so that the stopper 8 and the outer cylinder 1 do not directly collide with each other. The seal rubber 4 and the rubber portion 5 are continuous with each other through the window 3a of the intermediate cylinder 3.
【００２８】また、上記液室６，６は、図４に示すよう
に、上記ストッパ８の内周面に形成され上記内筒２を周
回するオリフィス通路９と、該オリフィス通路９より直
径方向に延設されて当該液室６，６に開口した連絡通路
１０，１０とによって連絡されている。当該液体封入ブ
ッシュの場合は、外筒１と内筒２との間に筒軸と直角方
向に相対変位があったときに、両液室６，６間で上記オ
リフィス通路９を介して液体の移動を生じそれによって
減衰作用を呈することになる。Further, as shown in FIG. 4, the liquid chambers 6 and 6 are formed in the inner peripheral surface of the stopper 8 and circulate the inner cylinder 2, and an orifice passage 9 is formed in a diameter direction from the orifice passage 9. Communication is established by the communication passages 10, 10 which are extended and opened in the liquid chambers 6, 6. In the case of the liquid-filled bush, when there is relative displacement between the outer cylinder 1 and the inner cylinder 2 in the direction perpendicular to the cylinder axis, the liquid is blocked between the liquid chambers 6 and 6 via the orifice passage 9. It will cause movement and thereby exhibit a damping effect.
【００２９】−シール構造− 上記液室６に液体を封ずるシール構造は、外筒１、中間
筒３及びシールゴム４が担っている。すなわち、中間筒
３は、その第１中間筒部３ｂの外径が第２中間筒部３ｃ
を含む他の部位よりも大径に形成されている。そして、
上記シールゴム４は、上記第１中間筒部３ｂと第２中間
筒部３ｃの外径差よりも大きな肉厚差でもって第１シー
ルゴム部４ａ側が薄く第２シールゴム部４ｂ側が厚く設
けられ、上記外筒１の縮径によって第１及び第２の各中
間筒部と外筒との間に加圧挟持されている。これによ
り、第１シールゴム部４ａのバネ定数が第２シールゴム
部４ｂのバネ定数よりも高くなっている。-Seal Structure- The outer cylinder 1, the intermediate cylinder 3 and the seal rubber 4 have a seal structure for sealing the liquid in the liquid chamber 6. That is, in the intermediate cylinder 3, the outer diameter of the first intermediate cylinder part 3b is the second intermediate cylinder part 3c.
Is formed to have a larger diameter than other parts including. And
The seal rubber 4 is provided such that the first seal rubber portion 4a side is thin and the second seal rubber portion 4b side is thick with a thickness difference larger than the outer diameter difference between the first intermediate cylinder portion 3b and the second intermediate cylinder portion 3c. Due to the reduced diameter of the cylinder 1, the first and second intermediate cylinders are pressed and sandwiched between the outer cylinder. As a result, the spring constant of the first seal rubber portion 4a is higher than the spring constant of the second seal rubber portion 4b.
【００３０】次にこのようなシール構造を得るための液
体封入ブッシュの製造方法を説明する。Next, a method of manufacturing a liquid-filled bush for obtaining such a seal structure will be described.
【００３１】−液体封入ブッシュの製造方法− 中間品及び外筒の製作 図３に示すように、筒軸方向中間部位に窓部３ａ，３ａ
を有し且つ第１中間筒部３ｂ側の外径が第２中間筒部３
ｃ側の外径よりも大きい中間筒３を製作する。内筒２に
はストッパ８を固定しておく。そして、上記内筒２と上
記中間筒３との間に上記ゴム部５を設ける一方、該中間
筒３の外周面にシールゴム４を第１中間筒部３ｂの方の
外径が第２中間筒部３ｃよりも小径になるように設けて
なる図５に示す中間品１１を製作する。一方、上記外筒
１を構成するための外筒部材１２は、その内径を上記第
１シールゴム部４ａの外径よりも大きく形成しておく。-Manufacturing Method of Liquid Encapsulating Bush-Production of Intermediate Product and Outer Cylinder As shown in FIG.
And the outer diameter on the side of the first intermediate tubular portion 3b is the second intermediate tubular portion 3
The intermediate cylinder 3 having a larger outer diameter on the c side is manufactured. A stopper 8 is fixed to the inner cylinder 2. Then, while the rubber portion 5 is provided between the inner cylinder 2 and the intermediate cylinder 3, the seal rubber 4 is provided on the outer peripheral surface of the intermediate cylinder 3 and the outer diameter of the first intermediate cylinder portion 3b is the second intermediate cylinder. The intermediate product 11 shown in FIG. 5 having a smaller diameter than the portion 3c is manufactured. On the other hand, the outer cylinder member 12 for forming the outer cylinder 1 has an inner diameter larger than the outer diameter of the first seal rubber portion 4a.
【００３２】 中間品の圧入及び液体の注入 上記中間品１１を外筒部材に圧入する。この場合、図６
に示すように、中間品１１における第１シールゴム部４
ａと外筒部材１２との間には微小隙間１３が形成され
る。そして、上記外筒部材１２とゴム部５の間に形成さ
れる液室部分に上記微小隙間１３を利用して真空引きし
ながら液体を注入し、該液室部分を当該液体によって満
たす。Press-fitting of intermediate product and injection of liquid The above-mentioned intermediate product 11 is press-fitted into the outer cylinder member. In this case,
As shown in, the first seal rubber portion 4 in the intermediate product 11
A minute gap 13 is formed between a and the outer cylinder member 12. Then, a liquid is injected into the liquid chamber portion formed between the outer cylinder member 12 and the rubber portion 5 while making a vacuum using the minute gap 13, and the liquid chamber portion is filled with the liquid.
【００３３】 外筒の縮径加工 縮径加工は、図７に示すように、上記液体と同じ液体１
４によって満たされ底部に縮径用治具１５が載置された
容器内の当該液中で行なう。Diameter Reduction Processing of Outer Cylinder The diameter reduction processing is performed by the same liquid 1 as the above liquid, as shown in FIG.
It is carried out in the liquid in a container filled with 4 and having a diameter reducing jig 15 placed on the bottom.
【００３４】すなわち、縮径用治具１５は、下方へいく
に従って内径が漸次小さくなるよう内周面にテーパ１５
ａが付された縮径加工部１５ｂを上部に備え、内径が上
記縮径加工部１５ｂよりも大きく形成された大径部１５
ｃを下部に備えてなる円筒状のものである。そして、上
記外筒部材１２に中間品１１を圧入してなる圧入品を、
上記液中に浸漬し第２中間筒部３ｃ側が下になるように
して、上記縮径用治具１５の縮径加工部１５ｂに加圧治
具１７によって上から圧入していく。That is, the diameter-reducing jig 15 has a taper 15 on the inner peripheral surface so that the inner diameter becomes gradually smaller as it goes downward.
A large-diameter portion 15 having a diameter-reduced portion 15b attached with a and having an inner diameter larger than that of the diameter-reduced portion 15b.
It has a cylindrical shape with c at the bottom. Then, a press-fitted product obtained by press-fitting the intermediate product 11 into the outer cylinder member 12 is
It is dipped in the above liquid so that the second intermediate cylinder portion 3c side faces downward, and is pressed into the diameter reducing portion 15b of the diameter reducing jig 15 by the pressing jig 17 from above.
【００３５】これにより、外筒部材１２は第２中間筒部
３ｃ側の端部から第１中間筒部３ｂ側の端部へと次第に
径が狭まっていく。この縮径によって上記液室部分の容
積が小さくなっていくが、第１シールゴム部４ａと外筒
部材１２との間に微小隙間１３が形成されているため、
上記容積の減少分に相当する液体が微小隙間１３から上
方へ流出していく。よって、縮径完了時点においても液
室６の液圧が高くなることはなく、液体の洩れやゴム部
５の破損は生じない。As a result, the diameter of the outer tubular member 12 gradually decreases from the end portion on the second intermediate tubular portion 3c side to the end portion on the first intermediate tubular portion 3b side. Although the volume of the liquid chamber portion decreases due to this diameter reduction, since the minute gap 13 is formed between the first seal rubber portion 4a and the outer cylinder member 12,
The liquid corresponding to the decrease in the volume flows out from the minute gap 13 upward. Therefore, even when the diameter reduction is completed, the liquid pressure in the liquid chamber 6 does not increase, and the liquid does not leak and the rubber portion 5 is not damaged.
【００３６】−微小隙間、シールゴムのバネ定数及びシ
ール性について− 液体封入ブッシュ各部の寸法設定を以下の通りとする。 外筒１の内径；４６．８mm 外筒部材（縮径前の外筒）１２の内径；４７．６ 第１中間筒部３ｂの外径；４５．８mm 第１シールゴム部４ａの自由状態での外径；４７．２mm 第２中間筒部３ｃの外径；４４．０mm 第２シールゴム部４ｂの自由状態での外径；４８．０mm-Small gap, spring constant of seal rubber, and sealing property-Dimensions of each part of the liquid-filled bush are set as follows. Inner diameter of outer cylinder 1; 46.8 mm Inner diameter of outer cylinder member (outer cylinder before reduction) 12; 47.6 Outer diameter of first intermediate cylinder portion 3b; 45.8 mm First seal rubber portion 4a in free state Outer diameter; 47.2 mm Outer diameter of the second intermediate tubular portion 3c; 44.0 mm Outer diameter of the second seal rubber portion 4b in the free state; 48.0 mm
【００３７】中間品１１を外筒部材１２に圧入した段階
では、第２シールゴム部４ｂは外径が４８．０mmから外
筒部材１２の内径４７．６mmに圧縮され、両者間に隙間
は生じないが、第１シールゴム部４ａの自由状態での外
径４７．２mmは外筒部材１２の内径よりも小さいから、
両者間に（４７．６−４７．２）÷２＝０．２mmの隙間
１３を生ずることになる。よって、上述の液圧の上昇を
招かない縮径加工が可能になる。When the intermediate product 11 is press-fitted into the outer cylinder member 12, the second seal rubber portion 4b is compressed from the outer diameter of 48.0 mm to the inner diameter of the outer cylinder member 12 of 47.6 mm, and there is no gap between them. However, since the outer diameter 47.2 mm of the first seal rubber portion 4a in the free state is smaller than the inner diameter of the outer tubular member 12,
A gap 13 of (47.6-47.2) /2=0.2 mm is generated between them. Therefore, it is possible to perform the diameter reduction processing that does not cause the increase in the hydraulic pressure.
【００３８】そうして、上記外筒部材１２の縮径後にお
いては、第２シールゴム部４ｂは当初の４８．０mmから
外筒１の内径４６．８mmに圧縮されるから、その圧縮代
は当該径差の２分の１で０．６mmである。この圧縮され
た第２シールゴム部４ｂのバネ定数を６７５kgf/mmとす
ると、この第２シールゴム４ｂは、６７５×０．６＝４
０５kgf までの荷重に対してシール性が得られることに
なる。Then, after the outer cylinder member 12 has been reduced in diameter, the second seal rubber portion 4b is compressed from the original 48.0 mm to the inner diameter 46.8 mm of the outer cylinder 1, so that the compression margin is concerned. One half of the diameter difference is 0.6 mm. Assuming that the spring constant of the compressed second seal rubber portion 4b is 675 kgf / mm, this second seal rubber 4b has 675 × 0.6 = 4.
The sealability can be obtained for loads up to 05kgf.
【００３９】一方、第１シールゴム部４ａの方は、当初
の４７．２mmから４６．８mmに圧縮され、その圧縮代は
０．２mmであり、当該圧縮によってバネ定数は９７６９
kgf/mmとなる。従って、４０５kgf の荷重が作用した場
合、４０５÷９７６９（約０．０４１）mmの変位を生ず
ることになるが、上記の如く０．２mmの圧縮代があるた
め、シール性には何の問題もない。On the other hand, the first seal rubber portion 4a is compressed from the original 47.2 mm to 46.8 mm, the compression margin is 0.2 mm, and the spring constant is 9769 due to the compression.
It becomes kgf / mm. Therefore, when a load of 405 kgf is applied, a displacement of 405 ÷ 9769 (about 0.041) mm will occur, but since there is a compression margin of 0.2 mm as described above, there is no problem with the sealing performance. Absent.
【００４０】＜実施例２＞本例は図８〜図１１に示され
ており、シールゴム２１が外筒１に固着されている点が
実施例１と大きく相違する。なお、実施例１のものと実
質的に同じ要素には同じ符号を付し、実施例１との相違
点を中心にて本例の説明を行なう。<Embodiment 2> This embodiment is shown in FIGS. 8 to 11, and is largely different from Embodiment 1 in that the seal rubber 21 is fixed to the outer cylinder 1. Note that the elements substantially the same as those in the first embodiment are designated by the same reference numerals, and the description of the present embodiment will be made focusing on the differences from the first embodiment.
【００４１】すなわち、外筒１自体、内筒２、中間筒
３、ゴム部５及びストッパ８の構成は実施例１のものと
同じであるが、シールゴム２１は中間筒３には固着され
ておらず外筒１に加硫接着されていて、第１中間筒部３
ｂに対応する部位が第１シールゴム部２１ａを構成し、
第２中間筒部３ｃに対応する部位が第２シールゴム部２
１ｂを構成している。That is, the outer cylinder 1 itself, the inner cylinder 2, the intermediate cylinder 3, the rubber portion 5 and the stopper 8 have the same structure as that of the first embodiment, but the seal rubber 21 is not fixed to the intermediate cylinder 3. Rather than being vulcanized and bonded to the outer cylinder 1, the first intermediate cylinder portion 3
The portion corresponding to b constitutes the first seal rubber portion 21a,
The portion corresponding to the second intermediate tubular portion 3c is the second seal rubber portion 2
It constitutes 1b.
【００４２】当該ブッシュの製造にあたっては、図９及
び図１０に示すように上記内筒２と中間筒３との間にゴ
ム部５を設けてなる内側中間品２２を製作する。一方、
内径が全長にわたって同じに形成された外筒部材２３
（図１１参照）の内周面シールゴム２１を設けて外側中
間品２４を製作する。この場合、第１シールゴム部２１
ａは第２シールゴム部２１ｂよりも薄肉に形成し、且つ
第１シールゴム部２１ａの内径は上記第１中間筒部３ｂ
の外径よりも大きく形成する。In manufacturing the bush, as shown in FIGS. 9 and 10, an inner intermediate product 22 having a rubber portion 5 between the inner cylinder 2 and the intermediate cylinder 3 is manufactured. on the other hand,
Outer cylinder member 23 having the same inner diameter over the entire length
The inner peripheral surface seal rubber 21 (see FIG. 11) is provided to manufacture the outer intermediate product 24. In this case, the first seal rubber portion 21
a is formed thinner than the second seal rubber portion 21b, and the inner diameter of the first seal rubber portion 21a is the same as that of the first intermediate cylindrical portion 3b.
Larger than the outer diameter of.
【００４３】そして、上記内側中間品２２を外側中間品
２４に圧入し、実施例１の場合と同様にして液室部分に
液体を注入する。本例の場合は、図１１に詳細に示すよ
うに第１中間筒部３ｂと第１シールゴム部２１ａとの間
に微小隙間２５が形成されることになる。Then, the inner intermediate product 22 is press-fitted into the outer intermediate product 24, and the liquid is injected into the liquid chamber portion in the same manner as in the first embodiment. In the case of this example, a minute gap 25 is formed between the first intermediate tubular portion 3b and the first seal rubber portion 21a as shown in detail in FIG.
【００４４】そうして、実施例１の場合と同様に、液中
において同様の治具を用いて、上記外筒部材２３の径を
第２中間筒部３ｃ側の端部から第１中間筒部３ｂの端部
へと次第に狭めていく縮径加工を行なう。その際、上記
液室部分の容積の減少分に相当する液体が上記第１中間
筒部３ｂと第１シールゴム部２１ａとの間の微小隙間２
５から流出することになる。よって、実施例１の場合と
同様に縮径完了時点において液室の液圧が高くなること
はなく、液体の洩れやゴム部５の破損は生じない。Then, as in the case of the first embodiment, the diameter of the outer cylinder member 23 is changed from the end on the second intermediate cylinder portion 3c side to the first intermediate cylinder by using the same jig in the liquid. A diameter reducing process is performed in which the diameter is gradually narrowed to the end of the portion 3b. At this time, the liquid corresponding to the decrease in the volume of the liquid chamber portion is the minute gap 2 between the first intermediate cylindrical portion 3b and the first seal rubber portion 21a.
It will flow out from 5. Therefore, as in the case of the first embodiment, the liquid pressure in the liquid chamber does not increase at the completion of the diameter reduction, and the liquid does not leak or the rubber portion 5 is not damaged.
【図１】実施例１の液体封入ブッシュの平面図FIG. 1 is a plan view of a liquid-filled bush according to a first embodiment.
【図２】図１のＡ−Ａ線における断面図FIG. 2 is a sectional view taken along line AA of FIG.
【図３】実施例１の中間筒の斜視図FIG. 3 is a perspective view of an intermediate cylinder of the first embodiment.
【図４】中間品の横断面図FIG. 4 is a cross-sectional view of an intermediate product
【図５】図４のＢ−Ｂ線における断面図5 is a cross-sectional view taken along the line BB of FIG.
【図６】実施例１における外筒とシールゴムとの隙間を
示す縦断面図FIG. 6 is a vertical cross-sectional view showing a gap between the outer cylinder and the seal rubber in the first embodiment.
【図７】外筒の縮径加工を行なっている状態を示す縦断
面図FIG. 7 is a vertical cross-sectional view showing a state in which the outer cylinder is reduced in diameter.
【図８】実施例２の液体封入ブッシュを示す縦断面図FIG. 8 is a vertical sectional view showing a liquid-filled bush according to a second embodiment.
【図９】内側中間品の横断面図FIG. 9 is a cross-sectional view of the inner intermediate product.
【図１０】図９のＣ−Ｃ線における断面図FIG. 10 is a sectional view taken along the line CC of FIG.
【図１１】実施例２におけるシールゴムと中間筒との隙
間を示す縦断面図FIG. 11 is a vertical cross-sectional view showing the gap between the seal rubber and the intermediate cylinder in the second embodiment.
１ 外筒 ２ 内筒 ３ 中間筒 ３ａ 窓 ３ｂ 第１中間筒部 ３ｃ 第２中間筒部 ４，２１ シールゴム ４ａ，２１ａ 第１シールゴム部 ４ｂ，２１ｂ 第２シールゴム部 ５ ゴム部 ５ａ ポケット（凹部） ６ 液室 ８ ストッパ ９ オリフィス通路 １１ 中間品 １２，２３ 外筒部材 １３ ２５ 微小隙間 １５ 縮径用治具 １７ 加圧治具 ２２ 内側中間品 ２４ 外側中間品 1 Outer Cylinder 2 Inner Cylinder 3 Middle Cylinder 3a Window 3b First Middle Cylinder 3c Second Middle Cylinder 4,21 Seal Rubber 4a, 21a First Seal Rubber 4b, 21b Second Seal Rubber 5 Rubber 5a Pocket (Concave) 6 Liquid chamber 8 Stopper 9 Orifice passage 11 Intermediate product 12,23 Outer cylinder member 13 25 Minute gap 15 Diameter reduction jig 17 Pressing jig 22 Inner intermediate product 24 Outer intermediate product
Claims (6)
された外筒及び内筒と、該内筒の外周面に設けられたゴ
ム部と、該ゴム部の外周面に開口し上記外筒との間に液
室を形成する凹部と、該凹部を挾んで軸方向の一方側及
び他方側の各ゴム部外周面に設けられた第１及び第２の
各中間筒部と、上記液室を密封するよう上記外筒と第１
及び第２の各中間筒部との間に介装された第１及び第２
の各シールゴム部とを備え、上記液室に減衰媒体として
の液体が収容された液体封入ブッシュであって、 上記第１中間筒部は上記第２中間筒部よりも外径が大き
く形成され、 上記外筒は上記第１中間筒部に対応する部位の内径と上
記第２中間筒部に対応する部位の内径とが実質的に同一
に形成されていて、 上記第１及び第２の各シールゴム部は、上記第１中間筒
部と第２中間筒部との外径差よりも大きな肉厚差でもっ
て第１シールゴム部の方が薄く第２シールゴム部の方が
厚く設けられて、第１シールゴム部のバネ定数が第２シ
ールゴム部のバネ定数よりも高くなるよう上記外筒の縮
径によって第１及び第２の各中間筒部と外筒との間に加
圧挟持されていることを特徴とする液体封入ブッシュ。1. An outer cylinder and an inner cylinder, which are arranged at an outer side and an inner side at a distance from each other, a rubber portion provided on an outer peripheral surface of the inner cylinder, and an outer peripheral surface of the rubber portion which is opened to the outer side. A concave portion that forms a liquid chamber between the cylinder and the first and second intermediate cylindrical portions that are provided on the outer peripheral surfaces of the rubber portions on one side and the other side in the axial direction across the concave portion; The outer cylinder and the first to seal the chamber
And a first and a second interposed between the second and the second intermediate cylinders, respectively.
Each of the seal rubber portions, and a liquid enclosing bush in which a liquid as a damping medium is stored in the liquid chamber, wherein the first intermediate tubular portion is formed to have an outer diameter larger than that of the second intermediate tubular portion. The outer cylinder is formed such that the inner diameter of the portion corresponding to the first intermediate tubular portion and the inner diameter of the portion corresponding to the second intermediate tubular portion are substantially the same, and each of the first and second seal rubbers. The first seal rubber part is thinner and the second seal rubber part is thicker than the first intermediate cylinder part and the second intermediate cylinder part with a thickness difference larger than the outer diameter difference between the first intermediate cylinder part and the second intermediate cylinder part. In order to make the spring constant of the seal rubber part higher than the spring constant of the second seal rubber part, it is pressed and sandwiched between the first and second intermediate cylinder parts and the outer cylinder by the reduced diameter of the outer cylinder. A characteristic liquid-filled bush.
された外筒及び内筒と、該内筒の外周面に設けられたゴ
ム部と、該ゴム部の外周面に開口し上記外筒との間に液
室を形成する凹部と、該凹部を挾んで軸方向の一方側及
び他方側の各ゴム部外周面に設けられた第１及び第２の
各中間筒部と、上記液室を密封するよう上記外筒と第１
及び第２の各中間筒部との間に介装された第１及び第２
の各シールゴム部とを備え、上記液室に減衰媒体として
の液体が収容された液体封入ブッシュの製造方法であっ
て、 上記第１中間筒部をその外径が第２中間筒部の外径より
も大きくなるように形成し、 上記内筒と上記第１及び第２の中間筒部との間に上記ゴ
ム部を設ける一方、該第１及び第２の中間筒部の各外周
面に第１及び第２の各シールゴム部を第１シールゴム部
の外径の方が第２シールゴム部の外径よりも小径になる
ように設けてなる中間品を製作し、 上記中間品を内径が軸方向の全長にわたって実質的に同
一に形成された外筒に圧入することによって上記液室を
形成するとともに、該液室に上記液体を入れ、 上記外筒の外径を上記第２中間筒部側の端部から上記第
１中間筒部側の端部へと次第に狭めていく縮径加工を行
なうことにより、上記液室の容積の減少分に相当する液
体を該液室から上記第１シールゴム部と当該外筒との間
を通して流出させて、上記中間品と外筒とを一体化する
ことを特徴とする液体封入ブッシュの製造方法。2. An outer cylinder and an inner cylinder, which are arranged at an outer side and an inner side at a distance from each other, a rubber portion provided on an outer peripheral surface of the inner cylinder, and an outer peripheral surface of the rubber portion which is opened to the outer side. A concave portion that forms a liquid chamber between the cylinder and the first and second intermediate cylindrical portions that are provided on the outer peripheral surfaces of the rubber portions on one side and the other side in the axial direction across the concave portion; The outer cylinder and the first to seal the chamber
And a first and a second interposed between the second and the second intermediate cylinders, respectively.
And a sealing rubber portion of each of the above, and a method for manufacturing a liquid-filled bush in which a liquid as a damping medium is contained in the liquid chamber, wherein the outer diameter of the first intermediate cylinder portion is the outer diameter of the second intermediate cylinder portion. And the rubber portion is provided between the inner cylinder and the first and second intermediate cylinder portions, while the first and second intermediate cylinder portions are provided with a first rubber member on each outer peripheral surface. Manufacture an intermediate product in which the first and second seal rubber parts are provided so that the outer diameter of the first seal rubber part is smaller than the outer diameter of the second seal rubber part. The liquid chamber is formed by press-fitting into the outer cylinder formed substantially the same over the entire length of the liquid cylinder, and the liquid is introduced into the liquid chamber, and the outer diameter of the outer cylinder is set to the second intermediate cylinder portion side. To perform diameter reduction processing that gradually narrows from the end to the end on the side of the first intermediate cylinder The liquid corresponding to the decrease in the volume of the liquid chamber is caused to flow out from the liquid chamber through the space between the first seal rubber portion and the outer cylinder to integrate the intermediate product and the outer cylinder. And a method for manufacturing a liquid-filled bush.
径加工前の外筒の内径よりも小径に形成するようにした
請求項２に記載の液体封入ブッシュの製造方法。3. The method for producing a liquid-filled bush according to claim 2, wherein the outer diameter of the first seal rubber portion is smaller than the inner diameter of the outer cylinder before the diameter reduction processing.
された外筒及び内筒と、該内筒の外周面に設けられたゴ
ム部と、該ゴム部の外周面に開口し上記外筒との間に液
室を形成する凹部と、該凹部を挾んで軸方向の一方側及
び他方側の各ゴム部外周面に設けられた第１及び第２の
各中間筒部と、上記液室を密封するよう上記外筒と第１
及び第２の各中間筒部との間に介装された第１及び第２
の各シールゴム部とを備え、上記液室に減衰媒体として
の液体が収容された液体封入ブッシュの製造方法であっ
て、 上記第１中間筒部をその外径が第２中間筒部の外径より
も大きくなるように形成し、 上記内筒と第１及び第２の中間筒部との間に上記ゴム部
を設けてなる内側中間品を製作する一方、 内径が軸方向の全長にわたって実質的に同一に形成され
た外筒の内周面に、第１及び第２の各シールゴム部を、
第１シールゴム部の内径の方が第２シールゴム部の内径
よりも大径になるように、且つ該両シールゴム部の内径
差が上記第１中間筒部と第２中間筒部との外径差よりも
大きくなるように設けてなる外側中間品を製作し、 上記内側中間品を外側中間品に圧入して上記液室を形成
するとともに、該液室に上記液体を入れ、 上記外筒の外径を上記第２中間筒部側の端部から上記第
１中間筒部側の端部へと次第に狭めていく縮径加工を行
なうことにより、上記液室の容積の減少分に相当する液
体を該液室から上記第１シールゴム部と当該外筒との間
を通して流出させて、上記内側中間品と外側中間品とを
一体化することを特徴とする液体封入ブッシュの製造方
法。4. An outer cylinder and an inner cylinder, which are spaced apart from each other and are arranged on the outer and inner sides, a rubber portion provided on an outer peripheral surface of the inner cylinder, and an outer peripheral surface of the rubber portion which is open to the outer surface. A concave portion that forms a liquid chamber between the cylinder and the first and second intermediate cylindrical portions that are provided on the outer peripheral surfaces of the rubber portions on one side and the other side in the axial direction across the concave portion; The outer cylinder and the first to seal the chamber
And a first and a second interposed between the second and the second intermediate cylinders, respectively.
And a sealing rubber portion of each of the above, and a method for manufacturing a liquid-filled bush in which a liquid as a damping medium is contained in the liquid chamber, While making an inner intermediate product that is formed so as to be larger than the inner cylinder and the rubber portion is provided between the inner cylinder and the first and second intermediate cylinder portions, the inner diameter is substantially equal to the entire axial length. On the inner peripheral surface of the outer cylinder formed in the same manner,
The inner diameter of the first seal rubber portion is larger than the inner diameter of the second seal rubber portion, and the difference in inner diameter between the both seal rubber portions is the difference in outer diameter between the first intermediate cylinder portion and the second intermediate cylinder portion. The outer intermediate product is manufactured to have a larger size than that of the outer cylinder, and the inner intermediate product is press-fitted into the outer intermediate product to form the liquid chamber, and the liquid is put into the liquid chamber, By performing a diameter reduction process in which the diameter is gradually narrowed from the end portion on the side of the second intermediate cylinder portion to the end portion on the side of the first intermediate cylinder portion, a liquid corresponding to the decrease in the volume of the liquid chamber is generated. A method for manufacturing a liquid-filled bush, characterized in that the inner intermediate product and the outer intermediate product are integrated by flowing out from the liquid chamber through a space between the first seal rubber portion and the outer cylinder.
部の内径を上記第１中間筒部の外径よりも大径に形成す
るようにした請求項４に記載の液体封入ブッシュの製造
方法。5. The method for producing a liquid-filled bush according to claim 4, wherein the inner diameter of the first seal rubber portion before the diameter reducing process is formed to be larger than the outer diameter of the first intermediate tubular portion.
う請求項２乃至請求項５のいずれか一項に記載の液体封
入ブッシュの製造方法。6. The method for manufacturing a liquid-filled bush according to claim 2, wherein the diameter reducing process is performed in the liquid for the liquid chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20415593A JP3390218B2 (en) | 1993-08-18 | 1993-08-18 | Liquid-enclosed bush and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20415593A JP3390218B2 (en) | 1993-08-18 | 1993-08-18 | Liquid-enclosed bush and manufacturing method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0754909A true JPH0754909A (en) | 1995-02-28 |
| JP3390218B2 JP3390218B2 (en) | 2003-03-24 |
Family
ID=16485750
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20415593A Expired - Fee Related JP3390218B2 (en) | 1993-08-18 | 1993-08-18 | Liquid-enclosed bush and manufacturing method thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3390218B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006027827A1 (en) * | 2004-09-07 | 2006-03-16 | Toyo Tire & Rubber Co., Ltd. | Liquid-sealed vibration-isolating device |
-
1993
- 1993-08-18 JP JP20415593A patent/JP3390218B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006027827A1 (en) * | 2004-09-07 | 2006-03-16 | Toyo Tire & Rubber Co., Ltd. | Liquid-sealed vibration-isolating device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3390218B2 (en) | 2003-03-24 |
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