JPS60211140A - Elastic bush - Google Patents

Abstract

PURPOSE:To reduce the number of machining stages of work of an intermediate ring itself, in its turn, an elastic bush, besides low-unit cost of production, by installing each intermediate ring in both end parts of an elastic member and, at the central part, installing a high rigid throttle passage in position between the elastic member and an outer cylinder. CONSTITUTION:A lockup of an elastic member 3 to an inner cylinder 1 takes place with vulcanizing adhesion or the like, and as for its lockup to an outer cylinder 2, the outer cylinder 2 is directly caulked to an outer circumferential surface of the elastic member 3 at a central part in an axial direction of the elastic member, while at its end part, the outer cylinder is caulked to each of intermediate rings 4 and 4 vulcanizedly stuck to the elastic member 3 whereby the lockup takes place in this way. And, furthermore at a part of the elastic member 3 to which the outer cylinder 2 is directly caulked, a high rigid throttle passage 9 bring about interconnection of both liquid chambers 5 and 5 installed in position between the elastic member 3 and the outer cylinder 2.

Description

【発明の詳細な説明】 〔技術分野〕 この発明は、自動車、産業機械その他に使用されて有効
なる防振作用をもたらす弾性ブツシュに関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an elastic bushing that is used in automobiles, industrial machinery, and the like and provides effective vibration isolation.

〔従来技術〕[Prior art]

主には、液室内に封入した非圧縮性流体の流動°抵抗に
基づいて振動の減衰をもたらす従来既知の弾性ブツシュ
としては、たとえばドイツ国特許第Ｚ、　８４１．５０
５号明細書に開示されたものがある。Previously known elastic bushings that provide vibration damping mainly based on the flow resistance of an incompressible fluid sealed in a liquid chamber include, for example, German Patent No. Z, 841.50.
There is one disclosed in Specification No. 5.

この弾性ブツシュは、円筒および外筒に固定される弾性
部材の外周に、液室と対応する寸法の窓穴を形成した中
間筒を嵌め合せ、この中間筒の外周に形成した絞９通路
によって液室相互の連通をもたらしてなる０ ところがこのような弾性ブツシュにあっては、とくに外
筒の組み付けに際し、それを中間筒の外局にかしめ固定
することが一般的であるため、そ　゛のかしめ加工によ
って、剛性部材で娶る中間筒の外周に形成される絞り通
路が変形して所期した減衰作用をもたらし得なくなるお
それがあり、またそのかしめ加工によって液室内の非圧
縮性液体が弾性部材を変形させる一方、その外周に設け
たーの中間筒がその変形を拘束すべく作用するので、弾
性部材に局部的に大きな初期応力が作用し、それが弾性
ブツシュの耐久性を低下させる問題が６った。This elastic bushing is made by fitting an intermediate cylinder in which a window hole with a size corresponding to the liquid chamber is formed on the outer periphery of a cylinder and an elastic member fixed to the outer cylinder, and allowing the liquid to flow through the 9 passages formed on the outer periphery of the intermediate cylinder. However, in the case of such elastic bushings, it is common to swage and fix them to the outer part of the intermediate cylinder, especially when assembling the outer cylinder. The machining process may deform the throttle passage formed on the outer periphery of the intermediate cylinder that is fitted with the rigid member, making it impossible to provide the desired damping effect, and the caulking process may cause the incompressible liquid in the liquid chamber to press against the elastic member. While deforming, the intermediate cylinder provided on the outer periphery acts to restrain the deformation, so a large initial stress acts locally on the elastic member, which reduces the durability of the elastic bushing. It was.

・　さらにまた、その弾性ブツシュの中間筒は、弾１性
ブツシュとほぼ等長の筒部材に複数の窓穴を形成してな
るため、加工工数および材料コ不トが嵩むとともに１重
量が大きくなる問題があった〇〔発明の目的〕 この発明は、従来技術のかかる問題を有利に解決するも
のであり、外筒のかしめ加工に全く影響されない絞９通
路を具え、また、そのがしめ加工に際する局部的に大き
な初期応力の作用を有効に緩和し、さらに、重量、加工
工数などの低減をもたらす弾性ブツシュを提供するもの
である〇〔発明の構成〕 この発明の弾性ブツシュは、同心配置した内外筒間に弾
性部材を設け、この弾性部材の軸線方向の中央部に、そ
の周方向に所定間隔をおく複数の液室を設け、また弾性
部材の軸線方向端部分で、弾性部材と外筒との間に中間
リングを設け、さらに、弾性部材と外筒との間に、液室
相互の連通をもたらす高剛性の絞シ通路を設けてなる〇
この弾性ブツシュでは、弾性部材の両端部の中間リング
に外筒をかしめ加工することにより、液室内への封入液
体に対する十分なる液密性がもたらされるので、筒部材
に窓穴を形成する従来技術に比し、加工工数、材料コス
トおよび重量の低減かも友らされ、また、そのがしめ加
工に際し、弾性部材の両端部にのみ位置する中間リング
は、液室の周シにおける弾性部材の周方向への変形をほ
とんど拘束することがなく、また弾性部材の軸線方向へ
の変形に対しては、中間リングが、相互に離間する方向
へ変移することができるので、中間リングと弾性部材と
の接合部分もしくはその近傍部分において、弾性部材に
局部的に大きな初期応力が作用することがない。・Furthermore, since the intermediate cylinder of the elastic bushing is formed by forming a plurality of windows in a cylinder member having approximately the same length as the elastic bushing, the number of processing steps and materials increases, and the weight increases. Problems 〇〇 [Object of the Invention] The present invention advantageously solves the problems of the prior art. [Structure of the Invention] The elastic bushing of the present invention effectively alleviates the effect of locally large initial stress when the An elastic member is provided between the inner and outer cylinders, and a plurality of liquid chambers are provided at a predetermined interval in the circumferential direction at the center of the elastic member in the axial direction. An intermediate ring is provided between the elastic member and the outer cylinder, and a highly rigid constriction passageway is provided between the elastic member and the outer cylinder to allow communication between the liquid chambers. In this elastic bushing, both ends of the elastic member are By caulking the outer cylinder to the intermediate ring of the cylinder, sufficient liquid-tightness against the liquid sealed in the liquid chamber is provided, so compared to the conventional technique of forming a window hole in the cylinder member, processing time, material cost, and In addition, during the crimping process, the intermediate rings located only at both ends of the elastic member hardly restrict the deformation of the elastic member in the circumferential direction around the periphery of the liquid chamber. In addition, in response to deformation of the elastic member in the axial direction, the intermediate ring can move away from each other. Large initial stress does not act locally.

さらに、弾性部材の外周に設けた高剛性の絞夛通路は、
外筒をかしめ加工するに際し、弾性部材の圧縮変形によ
ってその塑性変形を防止されるので１所要に応じた十分
なる長さの下で、常に所期した通シの振動減衰作用をも
たらすことができる伽〔実　施　例〕 以下にこの発明を図面に基づいて説明する。Furthermore, the highly rigid constriction passage provided on the outer periphery of the elastic member,
When caulking the outer cylinder, the compressive deformation of the elastic member prevents its plastic deformation, so it is possible to always provide the desired through-vibration damping effect under a sufficient length according to the requirements. [Example] This invention will be explained below based on the drawings.

第１図（ａｌ、　（ｂｌはそれぞれこの発明の一実施例
を示す断面図であり、図中１は円筒を、２は外筒をそれ
ぞれ示し、ま７（ａは、たとえば鋼製の内外筒１．２間
に設けた弾性部材を示す。Figure 1 (al, (bl) are sectional views showing one embodiment of the present invention, in which 1 represents a cylinder, 2 represents an outer cylinder, and 7 (a) represents an inner and outer cylinder made of steel, for example. 1. Shows the elastic member provided between 2.

ここで、ゴム、ゴム状弾性体などからなるこの弾性部材
８の内筒１への固定は、加硫接着、接着剤接着などによ
ってもたらされ、また、それの外筒２への固定は、弾性
部材８の軸線方向の中央部分では、弾性部材８の外周面
に対して外筒２を直接的にかしめ加工し、そしてその端
部分では、そこで弾性部材８にたとえば加硫接着した中
間リング４．４に外筒２をかしめ加工することによりも
たらされる０従って、弾性部材８の外筒２′ｆｔ直接的
にかしめ加工する部分は、中間リング４．４の外径より
も幾分大きい直径にすることが、そのかしめ強度を高め
る上で好ましい。Here, the elastic member 8 made of rubber, rubber-like elastic material, etc. is fixed to the inner cylinder 1 by vulcanization adhesion, adhesive adhesion, etc., and its fixation to the outer cylinder 2 is as follows. At the central part of the elastic member 8 in the axial direction, the outer cylinder 2 is caulked directly to the outer peripheral surface of the elastic member 8, and at the end part, an intermediate ring 4 is bonded to the elastic member 8 by vulcanization, for example. Therefore, the portion of the elastic member 8 that is directly crimped has a diameter somewhat larger than the outer diameter of the intermediate ring 4.4. It is preferable to do so in order to increase the caulking strength.

またここでは、弾性部材Ｂに、その軸線方向の°中央部
分で、直径方向に対向する二個の窪み８ａを設け、この
窪み８ａ内に非圧縮性の液体を封入することにより、対
向する二個の液室５″ｆｒ構成し、さらに、これらの各
液室５内に、内筒側から突出するストッパー６を設ける
。この発明では必須の５構成要件ではないこのストッパ
ー６は、たとえばボス付き剛性部材７を内筒ｌに嵌め合
せて固定し、そしてその表面に、弾性部材８と同質の弾
性材料８を被覆することにより構成することができ、こ
のストッパー８は、内外筒１．２の相対変位量が過大と
なった場合に、弾性材料８の緩衝作用下で、その相対変
位を拘束すべく作用する〇 そしてさらに、弾性部材８の、外筒２を直接的にかしめ
加工する部分において、弾性部材８と外筒２との間に、
液室５，５の連通をもたらす高剛性の絞り通路９を設け
るにの絞９通路９は、弾性部材８よりも剛性の高い鉄、
銅、合成樹脂などのパイプにて構成することができ、こ
のためには、第２図に示すように、弾性部材８の外周に
、パイプ径より幾分小径の条溝８ｂヲ形成し、この条溝
’Ｂｂ内へパイプ１０を緊密に嵌め合せることが好まし
い。また丸形、角形などとすることができるパイプ１０
は、条溝８ｂ内へのその正確なる位置決めのために、た
とえば第８図に示すように、その両端に、窪み８ａの縁
部に掛合するフランジ１０ａを有することが好ましい〇 なお、この絞り通路９は、図示例のみによらず、弾性部
材８の外周に配置したチャンネル状部材その他の溝形部
材と外筒２の内周面との協働下にて構成することもでき
、また、それを弾性部材Ｂの軸線方向へ紅白させること
によって所要に応じた長さを有することができる〇 かかる弾性ブツシュによれば、たとえば鋼製とすること
ができる中間リング４．４は、そこへの外筒２のかしめ
加工によって、ブツシュの軸線方向への十分なる液密性
をも次らし、また弾性部材８の中央部分は、そこへの外
筒２のがしめ加工によって、ブツシュの周方向への液密
性をも次らす＠従って、液室５内の非圧縮性流体の流動
は、絞り通路９を通ってだけ行われることになり、長さ
を・適宜に選択したその絞り通路９により、所期したイ 通りの振動減衰性能がもたらされる。Further, here, the elastic member B is provided with two diametrically opposing depressions 8a at its central portion in the axial direction, and an incompressible liquid is sealed in the depressions 8a. Furthermore, each liquid chamber 5 is provided with a stopper 6 that protrudes from the inner cylinder side.This stopper 6, which is not an essential component of the present invention, may be, for example, a stopper 6 with a boss. The rigid member 7 can be constructed by fitting and fixing the rigid member 7 into the inner cylinder 1, and covering the surface thereof with an elastic material 8 of the same quality as the elastic member 8. When the amount of relative displacement becomes excessive, it acts to restrain the relative displacement under the buffering effect of the elastic material 8. Furthermore, in the portion of the elastic member 8 where the outer cylinder 2 is caulked directly. , between the elastic member 8 and the outer cylinder 2,
The throttle passage 9 is made of iron, which has higher rigidity than the elastic member 8, to provide a highly rigid throttle passage 9 that brings communication between the liquid chambers 5, 5.
It can be constructed from a pipe made of copper, synthetic resin, etc. To this end, as shown in FIG. A tight fit of the pipe 10 into the groove 'Bb is preferred. The pipe 10 can also be round, square, etc.
In order to accurately position it in the groove 8b, it is preferable to have flanges 10a at both ends thereof, which engage with the edges of the recess 8a, as shown in FIG. 9 is not limited to the illustrated example, but may be constructed by cooperating with a channel-shaped member or other groove-shaped member disposed on the outer periphery of the elastic member 8 and the inner circumferential surface of the outer cylinder 2. According to such an elastic bushing, the intermediate ring 4.4, which can be made of steel, for example, can have a length according to the requirements by reddening in the axial direction of the elastic member B. By caulking the cylinder 2, sufficient liquid tightness is achieved in the axial direction of the bushing, and by caulking the outer cylinder 2 thereto, the central part of the elastic member 8 is secured in the circumferential direction of the bushing. Therefore, the flow of the incompressible fluid in the liquid chamber 5 takes place only through the restriction passage 9, and the length of the restriction passage 9 is selected appropriately. , the desired vibration damping performance is achieved.

なお、ここにおける中間リング４．４は、単純なるリン
グで足りることから、従来技術に比して加工工数、材料
コストおよび重量の低減がもたらされる０また、弾性部
材８の両端部にのみ固定されるこれらの中間リング４．
４は、外筒２のかしめ加工に際し、弾性部材８の周方向
および軸線方向への変形全それほど拘束しないので、弾
性部材８の中間リング４．４への接合部分もしくはその
近傍部分にそれほど大＠な初期応力が作用することはな
く、この故に、弾性ブツシュの耐久性および振動減衰特
性の向上がもたらされる。In addition, since the intermediate ring 4.4 here is a simple ring, the number of processing steps, material cost, and weight can be reduced compared to the conventional technology. These intermediate rings 4.
4, when caulking the outer cylinder 2, the deformation of the elastic member 8 in the circumferential direction and the axial direction is not restrained to a large extent, so that the portion where the elastic member 8 joins the intermediate ring 4.4 or the vicinity thereof is not so large. No significant initial stress acts, which results in improved durability and vibration damping properties of the elastic bushing.

さらに、この弾性ブツシュの絞り通路９は、弾性部材８
よシも剛性が高いので、外筒２のかしめ加工に際しては
絞り通路９の塑性変形より先に弾性部材８の変形が生じ
、これがため、絞９通路９に起因する問題が生じること
はない。Furthermore, the throttle passage 9 of this elastic bushing is formed by the elastic member 8
Since the rigidity is also high, when caulking the outer cylinder 2, the elastic member 8 is deformed before the plastic deformation of the throttle passage 9, and therefore problems caused by the throttle passage 9 do not occur.

以上この発明を図示例に基づいて説明したが、図示例で
は一本としている絞夛通路を二本とする°こと、液室の
数を三個以上とすることも可能である。さらには貫た、
第４図に示すように、雨中間リング４．４を液室５．５
間で一体的に連結し、その連結部分１１の内周面に、液
室相互の連通をもたらすチャンネル状部材１２その他を
液密に固着することもできる。Although the present invention has been described above based on the illustrated example, it is also possible to increase the number of fluid chambers to two instead of one in the illustrated example, and to increase the number of liquid chambers to three or more. Furthermore, it penetrated,
As shown in Figure 4, the rain intermediate ring 4.4 is connected to the liquid chamber 5.5.
A channel-like member 12 or the like that brings the liquid chambers into communication with each other can also be fixed in a liquid-tight manner to the inner circumferential surface of the connecting portion 11.

〔発明の効果〕〔Effect of the invention〕

従ってこの発明によれば、とくに、弾性部材の両端部に
中間リングを設け、またその中央部分で弾性部材と外筒
との間に高剛性の絞９通路を設けることにより、中間リ
ングそれ自体ひいては弾性ブツシュの加工工数、材料コ
ストおよび重量の低減がもたらされ、また、外筒の組み
付けに際する絞シ通路の変形、局部的な大きな初期応力
の発生が十分有効に防止されることになる。Therefore, according to the present invention, in particular, by providing an intermediate ring at both ends of the elastic member and providing a highly rigid restrictor 9 passageway between the elastic member and the outer cylinder in the central part, the intermediate ring itself and, in turn, This results in a reduction in the number of processing steps, material cost, and weight of the elastic bushing, and also effectively prevents deformation of the drawing passage and generation of large local initial stress when assembling the outer cylinder. .

【図面の簡単な説明】 第１図はこの発明の実施例金示す断面図、第２図は絞り
通路の構成例を示す断面図、第８図はパイプのフランジ
を示す図、　、第４図は中間フランジの他の例を示す部
分拡大斜視図である。 １・・・内筒　２・・・外筒 ８・・・弾性部材　４・・・中間リング５・・・液室　
９・・・絞り通路 １０・・・パイプ　ｌＯ＆・・・フランジ。 特許出願人　株式会社ブリヂストン 第１図 第３図 （ａ） 第４図[Brief Description of the Drawings] Fig. 1 is a sectional view showing an embodiment of the present invention, Fig. 2 is a sectional view showing an example of the configuration of a throttle passage, Fig. 8 is a view showing a flange of a pipe, and Fig. 4 is a partially enlarged perspective view showing another example of the intermediate flange. 1... Inner cylinder 2... Outer cylinder 8... Elastic member 4... Intermediate ring 5... Liquid chamber
9... Throttle passage 10... Pipe lO &... Flange. Patent applicant: Bridgestone Corporation Figure 1 Figure 3 (a) Figure 4

Claims (1)

【特許請求の範囲】[Claims] １　同心配置した円筒および外筒と、これらの内外筒間
に設けた弾性部材と、この弾性部材の軸線方向の中央部
で、その周方向に所定間隔をおいて設けた複数の液室と
、弾性部材の軸線方向端部分で、弾性部材と外筒との間
に設けた中間リングと、弾性部材と外筒との間に位置し
て液室相互の連通をもたらす高剛性の絞り通路とを具え
てなる弾性ブツシュＯ1 A cylinder and an outer cylinder arranged concentrically, an elastic member provided between these inner and outer cylinders, and a plurality of liquid chambers provided at predetermined intervals in the circumferential direction in the axial center of the elastic member, An intermediate ring is provided between the elastic member and the outer cylinder at the axial end portion of the elastic member, and a highly rigid throttle passage is located between the elastic member and the outer cylinder and provides communication between the liquid chambers. Elastic bushing O