JP2019086099A

JP2019086099A - Vibration controller

Info

Publication number: JP2019086099A
Application number: JP2017215407A
Authority: JP
Inventors: 猛古郡; Takeshi Kogori
Original assignee: Bridgestone Corp
Current assignee: Bridgestone Corp
Priority date: 2017-11-08
Filing date: 2017-11-08
Publication date: 2019-06-06
Anticipated expiration: 2037-11-08
Also published as: JP6962786B2

Abstract

To prevent a hard stopper part exposed due to abrasion of a stopper elastic part from colliding with an inner peripheral surface side of an external cylinder.SOLUTION: On an outer peripheral surface of an inside attachment member 11, a stopper part 16 is formed, which can contact with an inner peripheral surface side of an outer cylinder 12 when the inside attachment member and the outer cylinder relatively moves so as to approach each other. A stopper elastic part 34 covers the stopper part. At a circumferential intermediate portion in the stopper part, a recess part 16a is formed so as to extend radially inward in a recess axis direction. In the stopper elastic part, an outside portion 34b positioned outside in a circumferential direction with respect to an inside portion 34a covering the recess part of the stopper part, projects radially outward with respect to the inside portion.SELECTED DRAWING: Figure 1

Description

本発明は、防振装置に関するものである。 The present invention relates to an antivibration device.

従来から、振動発生部および振動受部のうちのいずれか一方に連結される内側取付部材、および他方に連結されるとともに、内側取付部材を径方向の外側から囲繞する外筒と、内側取付部材と外筒とを弾性的に連結する弾性体と、を備え、内側取付部材の外周面に、径方向の外側に向けて突出し、かつ内側取付部材および外筒が径方向に相対的に接近移動したときに、外筒の内周面側に当接可能なストッパ部が形成された防振装置が知られている。
この種の防振装置として、例えば下記特許文献１に示されるような、ストッパ部の頂面に、径方向の内側に向けて窪む窪み部が形成され、この窪み部に、ストッパ部の頂面から径方向の外側に向けて突出したストッパ弾性部が配設され、振幅の大きい振動が入力されたときに、ストッパ弾性部が外筒の内周面側に衝突する構成が知られている。 Conventionally, an inner mounting member connected to one of the vibration generating portion and the vibration receiving portion, and an outer cylinder connected to the other and surrounding the inner mounting member from the outer side in the radial direction, and the inner mounting member And an elastic body which elastically connects the outer cylinder with the outer cylinder, which protrudes outward in the radial direction on the outer peripheral surface of the inner mounting member, and the inner mounting member and the outer cylinder move relatively relatively in the radial direction There is known an anti-vibration device in which a stopper portion capable of coming into contact with the inner peripheral surface side of the outer cylinder is formed when the movement.
As a vibration damping device of this type, for example, as shown in Patent Document 1 below, a recess which is recessed inward in the radial direction is formed on the top surface of the stopper, and the top of the stopper is formed in this recess. There is known a configuration in which a stopper elastic portion protruding outward in a radial direction from a surface is disposed, and the stopper elastic portion collides with the inner peripheral surface side of the outer cylinder when a vibration having a large amplitude is input. .

特開２００４−１９０７３２号公報JP 2004-190732 A

しかしながら、前記従来の防振装置では、ストッパ弾性部が摩耗し硬質のストッパ部が露出して、このストッパ部が直接、外筒の内周面側に衝突することで、大きな衝撃力が生ずるおそれがあった。 However, in the above-described conventional vibration damping device, the stopper elastic portion may be worn and a hard stopper portion may be exposed, and the stopper portion may directly collide with the inner peripheral surface side of the outer cylinder to generate a large impact force. was there.

この発明は、このような事情を考慮してなされたもので、ストッパ弾性部の摩耗により硬質のストッパ部が露出して、外筒の内周面側に衝突するのを抑制することができる防振装置を提供することを目的とする。 The present invention has been made in consideration of such circumstances, and can prevent the hard stopper portion from being exposed due to the wear of the stopper elastic portion and preventing collision with the inner peripheral surface side of the outer cylinder. The purpose is to provide a vibration device.

前記課題を解決して、このような目的を達成するために、本発明の防振装置は、振動発生部および振動受部のうちのいずれか一方に連結される内側取付部材、および他方に連結されるとともに、前記内側取付部材を囲繞する外筒と、前記内側取付部材と前記外筒とを弾性的に連結する弾性体と、を備え、前記内側取付部材の外周面には、前記内側取付部材および前記外筒が相対的に接近移動したときに、前記外筒の内周面側に当接可能なストッパ部が形成され、前記ストッパ部を覆うストッパ弾性部を備え、前記ストッパ部のうち、前記外筒の中心軸線に沿う軸方向から見た平面視で前記中心軸線回りに周回する周方向の中間部分に、前記平面視で前記中心軸線に交差する径方向の内側に向けて窪む窪み部が形成され、前記ストッパ弾性部において、前記ストッパ部の窪み部を覆う内側部分より周方向の外側に位置する外側部分は、前記内側部分より径方向の外側に突出していることを特徴とする。 In order to solve the above problems and achieve such an object, the vibration control device of the present invention is connected to an inner mounting member connected to one of the vibration generating portion and the vibration receiving portion, and to the other. An outer cylinder surrounding the inner attachment member, and an elastic body elastically connecting the inner attachment member and the outer cylinder, and the inner attachment member is provided on the outer peripheral surface of the inner attachment member. When the member and the outer cylinder move relatively close to each other, there is formed a stopper portion capable of coming into contact with the inner peripheral surface side of the outer cylinder, and a stopper elastic portion covering the stopper portion is provided. And recessed inward in a radial direction intersecting with the central axis in the plan view in an intermediate portion in a circumferential direction that revolves around the central axis in a plan view viewed from an axial direction along the central axis of the outer cylinder. A recessed portion is formed on the stopper elastic portion. There are, outer portion located outside the inner portion circumferential direction of covering the recess of the stopper portion is characterized in that protrudes outward in the radial direction from the inner portion.

この発明によれば、ストッパ弾性部のうち外側部分が内側部分より径方向の外側に突出しているので、ストッパ弾性部のうち、外筒の内周面側に比較的当接しやすい内側部分の摩耗を抑えることができるとともに、ストッパ弾性部の摩耗が進行しても、この内側部分からストッパ部が露出するのを抑制することができる。
しかも、ストッパ弾性部の内側部分が、ストッパ部の窪み部を覆っているので、内側部分の厚さを確保することが可能になり、この内側部分が外筒の内周面側に衝突したときに生ずる衝撃力を抑えることができるとともに、この内側部分からストッパ部が露出するのを確実に抑制することができる。 According to the present invention, since the outer portion of the stopper elastic portion protrudes outward in the radial direction from the inner portion, the wear of the inner portion of the stopper elastic portion which easily contacts the inner peripheral surface side of the outer cylinder It is possible to suppress the exposure of the stopper portion from the inner portion even if the wear of the stopper elastic portion progresses.
Moreover, since the inner portion of the stopper elastic portion covers the depressed portion of the stopper portion, it is possible to secure the thickness of the inner portion, and when the inner portion collides with the inner peripheral surface side of the outer cylinder It is possible to suppress the impact force generated at the same time and reliably suppress the exposure of the stopper portion from the inner portion.

ここで、前記ストッパ部は、前記内側取付部材の外周面から径方向の外側に膨出し、前記窪み部は、前記ストッパ部の、径方向の外側を向く頂面において、その軸方向の両端縁より前記軸方向の内側に位置する部分に形成されてもよい。 Here, the stopper portion bulges outward in the radial direction from the outer peripheral surface of the inner attachment member, and the depressed portion is an end edge in the axial direction on the top surface of the stopper portion facing in the radial direction. It may be formed in the part located in the above-mentioned axial direction.

この場合、窪み部が、ストッパ部の頂面において、その軸方向の両端縁より前記軸方向の内側に位置する部分に形成されているので、ストッパ弾性部の内側部分が、外筒の内周面側に衝突したときに、ストッパ弾性部の内側部分のうち、窪み部内に位置する被収容部分が全域にわたって、窪み部の内面に押し当てられることとなり、被収容部分に、過度に大きく変形して応力が集中してしまう箇所が生ずるのを抑制することが可能になり、ストッパ弾性部の耐久性を向上させることができる。 In this case, the recessed portion is formed on the top surface of the stopper portion at a portion located inward of both axial end edges in the axial direction, so the inner portion of the stopper elastic portion is the inner periphery of the outer cylinder. When colliding with the surface side, of the inner portion of the stopper elastic portion, the accommodated portion located in the depressed portion is pressed against the inner surface of the depressed portion over the entire area, and the accommodated portion is deformed excessively. As a result, it is possible to suppress the occurrence of a location where stress is concentrated, and the durability of the stopper elastic portion can be improved.

また、前記内側部分と前記外側部分とは、周方向に分断されてもよい。 In addition, the inner portion and the outer portion may be divided in the circumferential direction.

この場合、ストッパ弾性部において、内側部分と外側部分とが、周方向に分断されているので、ストッパ弾性部の摩耗の進行に伴い、内側部分と外側部分との境界部分に亀裂が発生することがなく、この亀裂が、内側部分および外側部分に進展するのを防ぐことができる。これにより、ストッパ弾性部からストッパ部が露出するのを確実に抑えることができる。 In this case, in the stopper elastic portion, the inner portion and the outer portion are divided in the circumferential direction, so that a crack is generated at the boundary portion between the inner portion and the outer portion with the progress of the wear of the stopper elastic portion. , And this crack can be prevented from developing into the inner and outer portions. Thus, exposure of the stopper portion from the stopper elastic portion can be reliably suppressed.

また、前記弾性体は、前記内側取付部材を径方向に挟む両側に各別に配設され、前記内側取付部材と前記外筒との間には、周方向に互いに隣り合う前記弾性体同士の間を径方向の外側から覆い前記内側取付部材との間に液室を画成する被覆部材が配設され、前記被覆部材と前記外筒との間に、各前記液室同士を連通するオリフィス通路が形成され、前記ストッパ部および前記ストッパ弾性部は、周方向で互いに隣り合う前記弾性体同士の間に配設されてもよい。 Further, the elastic bodies are separately disposed on both sides of the inner mounting member in the radial direction, and between the elastic bodies adjacent to each other in the circumferential direction between the inner mounting member and the outer cylinder. A covering member for covering the outer mounting member from the outside in the radial direction and defining a liquid chamber between the inner mounting member and an orifice passage for communicating the liquid chambers with each other between the covering member and the outer cylinder The stopper portion and the stopper elastic portion may be disposed between the elastic bodies adjacent to each other in the circumferential direction.

この場合、各液室のうちのいずれか一方が縮小変形し、かつ他方が拡張変形するように、防振装置に径方向の振動が入力されたときに、液室の液体がオリフィス通路を流通することで、オリフィス通路で液柱共振が発生し、この振動が減衰、吸収される、いわゆる液封型の防振装置において、ストッパ弾性部の摩耗に起因した前述の衝撃力が生ずるのを抑制することができる。 In this case, when vibration in the radial direction is input to the vibration isolation device so that one of the liquid chambers is deformed in a reduced manner and the other is expanded, the liquid in the liquid chamber flows through the orifice passage. As a result, liquid column resonance occurs in the orifice passage, and this vibration is damped and absorbed. In a so-called liquid-sealed anti-vibration device, the above-described impact force caused by the wear of the stopper elastic portion is suppressed can do.

この発明に係る防振装置によれば、ストッパ弾性部の摩耗により露出した硬質のストッパ部が、外筒の内周面側に衝突するのを抑制することができる。 According to the vibration control device in accordance with the present invention, it is possible to suppress that the hard stopper portion exposed due to the wear of the stopper elastic portion collides with the inner peripheral surface side of the outer cylinder.

本発明に係る一実施形態として示した防振装置の軸方向の中央部における横断面図である。It is a cross-sectional view in the axial direction center part of the vibration isolator shown as one embodiment concerning the present invention. 図１に示す防振装置のＡ−Ａ線矢視断面図である。It is the sectional view on the AA line arrow of the vibration-proof device shown in FIG. 図１に示す防振装置のＢ−Ｂ線矢視断面図である。It is a BB arrow directional cross-sectional view of the vibration-proof device shown in FIG. 図１から図３に示す防振装置において、外筒を取り外した状態で、２つの被覆部材における２つの境界部分のうちの一方を径方向の外側から見た側面図である。FIG. 6 is a side view of one of two boundary portions of two covering members as viewed from the outer side in the radial direction in the vibration damping device shown in FIGS. 1 to 3 with the outer cylinder removed. 図１から図３に示す防振装置において、外筒を取り外した状態で、２つの被覆部材における２つの境界部分のうちの他方を径方向の外側から見た側面図である。The vibration isolator shown in FIGS. 1 to 3 is a side view in which the other of two boundary portions of two covering members is viewed from the outside in the radial direction with the outer cylinder removed. 図４および図５に示す防振装置において、被覆部材を取り外した状態で中弾性体を正面視した側面図である。FIG. 6 is a side view of the intermediate elastic body in a front view with the cover member removed in the vibration control device shown in FIGS. 4 and 5. 図４および図５に示す防振装置において、被覆部材を取り外した状態でストッパ弾性部を正面視した側面図である。FIG. 5 is a side view of the anti-vibration device shown in FIG. 4 and FIG.

以下、本発明に係る防振装置の一実施形態を、図１〜図７を参照しながら説明する。
本実施形態の防振装置１は、振動発生部および振動受部のうちのいずれか一方に連結される内側取付部材１１、および他方に連結されるとともに、内側取付部材１１を囲繞する外筒１２と、内側取付部材１１と外筒１２とを弾性的に連結する弾性体３１、３２と、を備えている。
なお、防振装置１は、例えば自動車用のサスペンションブッシュやエンジンマウント、あるいは工場に設置される産業機械のマウント等として用いられる。
以下、外筒１２の中心軸線Ｏに沿う方向を軸方向といい、軸方向から見た平面視において、中心軸線Ｏに交差する方向を径方向といい、中心軸線Ｏ回りに周回する方向を周方向という。 Hereinafter, an embodiment of a vibration control device according to the present invention will be described with reference to FIGS. 1 to 7.
The vibration damping device 1 of the present embodiment includes an inner mounting member 11 coupled to one of the vibration generating portion and the vibration receiving portion, and an outer cylinder 12 coupled to the other and surrounding the inner mounting member 11. And elastic bodies 31 and 32 which elastically connect the inner mounting member 11 and the outer cylinder 12.
The vibration damping device 1 is used as, for example, a suspension bush or an engine mount for a car, or a mount of an industrial machine installed in a factory.
Hereinafter, a direction along the central axis O of the outer cylinder 12 is referred to as an axial direction, and a direction intersecting the central axis O is referred to as a radial direction in plan view viewed from the axial direction. It is called a direction.

図１から図３に示されるように、内側取付部材１１は、中心軸線Ｏと同軸に配設された円筒状に形成されている。内側取付部材１１の軸方向の中間部分に、径方向の外側に向けて膨出した膨出部１５が全周にわたって形成されている。膨出部１５は、内側取付部材１１における軸方向の中央部に形成されている。膨出部１５の、径方向の外側を向く頂面１５ａは、周方向に延びるとともに、軸方向に延びている。膨出部１５は外筒１２の内側に配置されている。なお、内側取付部材１１の内径は、軸方向の全長にわたって同等になっている。内側取付部材１１の軸方向の両端部は、外筒１２から軸方向の外側に突出している。 As shown in FIGS. 1 to 3, the inner attachment member 11 is formed in a cylindrical shape coaxially disposed with the central axis O. At an axially intermediate portion of the inner mounting member 11, a bulging portion 15 that bulges outward in the radial direction is formed over the entire circumference. The bulging portion 15 is formed at the central portion in the axial direction of the inner mounting member 11. The radially outwardly facing top surface 15 a of the bulging portion 15 extends in the circumferential direction and also in the axial direction. The bulging portion 15 is disposed inside the outer cylinder 12. The inner diameter of the inner mounting member 11 is equal over the entire length in the axial direction. Both axial end portions of the inner mounting member 11 protrude outward in the axial direction from the outer cylinder 12.

弾性体３１、３２は、ゴム材料により形成され、内側取付部材１１の外周面に加硫接着されている。弾性体３１、３２は、軸方向に間隔をあけて配置されるとともに、外筒１２内に嵌合された一対の端弾性体３１と、端弾性体３１同士の間に配設され、周方向に間隔をあけて配置された一対の中弾性体３２と、を備える。 The elastic bodies 31 and 32 are made of a rubber material, and are adhered by vulcanization to the outer peripheral surface of the inner mounting member 11. The elastic bodies 31 and 32 are arranged at intervals in the axial direction, and are arranged between a pair of end elastic bodies 31 fitted in the outer cylinder 12 and the end elastic bodies 31, in the circumferential direction. And a pair of middle elastic bodies 32 spaced apart from each other.

端弾性体３１は、膨出部１５の表面のうち、頂面１５ａにおける軸方向の両端部から径方向の内側に向けて延び、軸方向を向く両端面１５ｂに各別に配設されている。端面１５ｂは、頂面１５ａから径方向の内側に向かうに従い漸次、軸方向の外側に向けて延びている。端弾性体３１は、膨出部１５の端面１５ｂから軸方向の外側に向かうに従い漸次、径方向の外側に向けて延びる筒部３１ａと、筒部３１ａにおける軸方向の外側の端部から径方向の外側に向けて突出し、全周にわたって連続して延びるフランジ部３１ｂと、を備える。筒部３１ａおよびフランジ部３１ｂは、中心軸線Ｏと同軸に配置されている。フランジ部３１ｂは、内側取付部材１１における軸方向の端部より軸方向の内側に位置している。フランジ部３１ｂ内に環状の補強板３３が埋設されている。補強板３３は、例えば金属材料、若しくは合成樹脂材料等の硬質の材質で形成される。一対の端弾性体３１は、互いに同等の形状で、同等の大きさに形成されている。 The end elastic body 31 extends radially inward from both axial end portions of the top surface 15 a of the surface of the bulging portion 15 and is separately disposed on both end surfaces 15 b facing the axial direction. The end face 15 b extends outward in the axial direction gradually inward in the radial direction from the top face 15 a. The end elastic body 31 extends in the radial direction from the axial outer end of the cylindrical portion 31a, which gradually extends outward in the radial direction from the end face 15b of the bulging portion 15 toward the outer side in the axial direction. And a flange portion 31b that protrudes toward the outside of the and extends continuously over the entire circumference. The cylindrical portion 31 a and the flange portion 31 b are disposed coaxially with the central axis O. The flange portion 31 b is located on the inner side in the axial direction from the end in the axial direction of the inner mounting member 11. An annular reinforcing plate 33 is embedded in the flange portion 31b. The reinforcing plate 33 is formed of, for example, a hard material such as a metal material or a synthetic resin material. The pair of end elastic bodies 31 have the same shape and the same size.

中弾性体３２は、内側取付部材１１を径方向に挟む両側に各別に配設されている。中弾性体３２は、全域にわたってゴム材料により形成されている。中弾性体３２は、図６に示されるように、内側取付部材１１における軸方向の中央部に配設された主部３２ａと、主部３２ａから軸方向の外側に向けて各別に突出し、かつ主部３２ａより体積が小さい一対の副部３２ｂと、を備える。主部３２ａおよび副部３２ｂはそれぞれ、径方向の外側から見た正面視で、一対の辺部が周方向に延び、かつ残り一対の辺部が軸方向に延びる矩形状を呈する。副部３２ｂは、主部３２ａにおける周方向の中央部に接続されている。副部３２ｂにおける軸方向の外端は、端弾性体３１のフランジ部３１ｂに接続されている。主部３２ａ、および副部３２ｂそれぞれの、径方向の外側を向く外面は、径方向の外側から見た正面視で軸方向に直交する横方向、および軸方向の双方向に延びる平坦面となっている。主部３２ａおよび副部３２ｂの各外面は、段差なく連なっている。一対の中弾性体３２は、互いに同等の形状で、同等の大きさに形成されている。主部３２ａの周方向の大きさは、副部３２ｂの周方向の大きさより大きい。主部３２ａの軸方向の大きさは、副部３２ｂの軸方向の大きさより小さい。 The middle elastic body 32 is separately disposed on both sides of the inner mounting member 11 in the radial direction. The middle elastic body 32 is formed of a rubber material over the entire area. The middle elastic body 32, as shown in FIG. 6, projects separately from the main portion 32a disposed at the axial center of the inner attachment member 11 and outward from the main portion 32a in the axial direction, and And a pair of sub-portions 32b smaller in volume than the main portion 32a. Each of the main portion 32a and the sub portion 32b has a rectangular shape in which a pair of side portions extend in the circumferential direction and a remaining pair of side portions extend in the axial direction in a front view as viewed from the outer side in the radial direction. Sub part 32 b is connected to the circumferential center part of main part 32 a. The axial outer end of the sub portion 32 b is connected to the flange portion 31 b of the end elastic body 31. The radially outer surface of each of the main portion 32a and the sub portion 32b is a flat surface extending in both the transverse and axial directions orthogonal to the axial direction in a front view viewed from the radially outer side. ing. The outer surfaces of the main portion 32a and the sub portion 32b are continuous without steps. The pair of middle elastic bodies 32 have the same shape and the same size. The circumferential size of the main portion 32a is larger than the circumferential size of the sub portion 32b. The axial size of the main portion 32a is smaller than the axial size of the sub portion 32b.

ここで、図１に示されるように、内側取付部材１１の膨出部１５のうち、周方向で互いに隣り合う中弾性体３２同士の間に位置するストッパ部１６に、径方向の内側に向けて窪む窪み部１６ａが形成されている。窪み部１６ａは、軸方向に延びる溝状に形成されている。窪み部１６ａは、径方向の外側から見て軸方向に長い長方形状を呈する。ストッパ部１６は、内側取付部材１１および外筒１２が相対的に接近移動したときに、後述する被覆部材１７の内面（外筒１２の内周面側）に当接可能に形成されている。ストッパ部１６は、膨出部１５のうち、他の部分より径方向の外側に位置しており、膨出部１５の頂面１５ａは、軸方向から見た平面視で長円形状を呈する。ストッパ部１６における頂面１５ａは、前記平面視で中心軸線Ｏを中心とする円弧形状に形成されている。 Here, as shown in FIG. 1, in the bulging portion 15 of the inner mounting member 11, the stopper portion 16 positioned between the middle elastic bodies 32 adjacent to each other in the circumferential direction is directed radially inward. A recessed portion 16a is formed. The recess 16 a is formed in the shape of a groove extending in the axial direction. The recess 16a has a rectangular shape that is long in the axial direction when viewed from the outer side in the radial direction. The stopper portion 16 is formed to be able to abut on the inner surface (the inner peripheral surface side of the outer cylinder 12) of the covering member 17 described later when the inner mounting member 11 and the outer cylinder 12 move relatively close to each other. The stopper portion 16 is located radially outward of the other portions of the bulging portion 15, and the top surface 15 a of the bulging portion 15 has an oval shape in a plan view as viewed from the axial direction. The top surface 15 a of the stopper portion 16 is formed in an arc shape centering on the central axis O in the plan view.

窪み部１６ａは、ストッパ部１６の周方向の中間部分に形成されている。図示の例では、窪み部１６ａは、ストッパ部１６の周方向の中央部に形成されている。図２に示されるように、窪み部１６ａは、ストッパ部１６の頂面１５ａにおいて、その軸方向の両端縁より軸方向の内側に位置する部分に形成されている。すなわち、窪み部１６ａにおける軸方向の両端部は、ストッパ部１６の両端面１５ｂに開口していない。図示の例では、窪み部１６ａは、ストッパ部１６の頂面１５ａにおいて、その周方向の両端縁より周方向の内側に位置する部分に形成されている。窪み部１６ａの開口部は、突曲面状に形成されている。窪み部１６ａは、中心軸線Ｏに直交する横断面視で、径方向の内側に向けて窪む凹曲面状に形成されている。ストッパ部１６の頂面１５ａのうち、窪み部１６ａの開口部と、頂面１５ａの軸方向の端縁と、の間に位置する部分は、軸方向に沿う縦断面視において、軸方向に直線状に延びている。 The recessed portion 16 a is formed at an intermediate portion in the circumferential direction of the stopper portion 16. In the illustrated example, the recess 16 a is formed at the center of the stopper 16 in the circumferential direction. As shown in FIG. 2, the recessed portion 16 a is formed in the top surface 15 a of the stopper portion 16 in a portion positioned inward in the axial direction from both end edges in the axial direction. That is, both axial end portions of the recessed portion 16 a are not open to the both end surfaces 15 b of the stopper portion 16. In the illustrated example, the recessed portion 16 a is formed in the top surface 15 a of the stopper portion 16 in a portion positioned inward in the circumferential direction from both end edges in the circumferential direction. The opening of the recess 16a is formed in a convex curved shape. The recessed portion 16 a is formed in a concave surface shape which is recessed inward in the radial direction in a cross-sectional view orthogonal to the central axis O. A portion of the top surface 15a of the stopper portion 16 located between the opening of the recess 16a and the axial end edge of the top surface 15a is axially straight in a longitudinal sectional view along the axial direction. It extends in the shape of

本実施形態では、ストッパ部１６を覆うストッパ弾性部３４を備える。ストッパ部１６およびストッパ弾性部３４は、周方向で互いに隣り合う中弾性体３２同士の間に配設されている。ストッパ弾性部３４、および弾性体３１、３２は、例えばゴム材料等で一体に形成されている。なお、内側取付部材１１の外周面は、全域にわたって例えばゴム材料等で覆われている。 In the present embodiment, the stopper elastic portion 34 covering the stopper portion 16 is provided. The stopper portion 16 and the stopper elastic portion 34 are disposed between the middle elastic bodies 32 adjacent to each other in the circumferential direction. The stopper elastic portion 34 and the elastic bodies 31, 32 are integrally formed of, for example, a rubber material or the like. The outer peripheral surface of the inner mounting member 11 is covered with, for example, a rubber material over the entire area.

図１に示されるように、ストッパ弾性部３４において、ストッパ部１６の窪み部１６ａを覆う内側部分３４ａより周方向の外側に位置する外側部分３４ｂは、内側部分３４ａより径方向の外側に突出している。内側部分３４ａの外表面は、中心軸線Ｏを中心とする円弧形状に形成されている。外側部分３４ｂの外表面は、径方向の外側に向けて突の曲面状に形成されている。中心軸線Ｏに直交する横断面視において、内側部分３４ａの外表面の曲率半径は、外側部分３４ｂの外表面の曲率半径より大きい。外側部分３４ｂ、および中弾性体３２の主部３２ａそれぞれの軸方向の大きさは互いに同等され、外側部分３４ｂ、および主部３２ａそれぞれの軸方向の位置は互いに同等になっている。 As shown in FIG. 1, in the stopper elastic portion 34, an outer portion 34b located on the outer side in the circumferential direction than the inner portion 34a covering the depressed portion 16a of the stopper portion 16 protrudes radially outward from the inner portion 34a. There is. The outer surface of the inner portion 34 a is formed in an arc shape centered on the central axis O. The outer surface of the outer portion 34b is formed in the shape of a curved surface protruding outward in the radial direction. In a cross-sectional view perpendicular to the central axis O, the radius of curvature of the outer surface of the inner portion 34a is larger than the radius of curvature of the outer surface of the outer portion 34b. The axial sizes of the outer portion 34b and the main portion 32a of the middle elastic body 32 are equal to each other, and the axial positions of the outer portion 34b and the main portion 32a are equal to each other.

内側部分３４ａと外側部分３４ｂとは、周方向に分断されている。この分断部分（以下、第１分断部分という）３４ｃは、図７に示されるように、ストッパ弾性部３４において、内側部分３４ａと２つの外側部分３４ｂとの各接続部分における軸方向の全長にわたって形成されている。第１分断部分３４ｃにおける軸方向の両端部は、外側部分３４ｂにおける軸方向の両端部より軸方向の外側に位置している。第１分断部分３４ｃにおける軸方向の両端部は、ストッパ部１６の頂面１５ａにおいて、窪み部１６ａより軸方向の外側に位置する部分に位置している。図１に示されるように、第１分断部分３４ｃは、ストッパ部１６の頂面１５ａにおいて、その周方向の両端縁、および窪み部１６ａの開口部の双方から周方向に離れた位置に配置されている。
第１分断部分３４ｃは、ストッパ弾性部３４を径方向に貫通し、かつ周方向の幅を有して、軸方向に延びる長孔となっている。内側部分３４ａのうち、２つの第１分断部分３４ｃに周方向に挟まれた部分の周方向の大きさは、外側部分３４ｂの周方向の大きさより小さくなっている。 The inner portion 34a and the outer portion 34b are circumferentially separated. This divided portion (hereinafter referred to as the first divided portion) 34c is formed over the entire axial length of each connecting portion of the inner portion 34a and the two outer portions 34b in the stopper elastic portion 34, as shown in FIG. It is done. Both axial end portions of the first divided portion 34c are located axially outside of both axial end portions of the outer portion 34b. Both end portions in the axial direction of the first divided portion 34 c are located on the top surface 15 a of the stopper portion 16 at a portion located axially outside the recessed portion 16 a. As shown in FIG. 1, in the top surface 15a of the stopper portion 16, the first divided portion 34c is disposed at a position circumferentially away from both the circumferential end edges and the opening of the recess 16a. ing.
The first divided portion 34 c penetrates the stopper elastic portion 34 in the radial direction, has a circumferential width, and is an elongated hole extending in the axial direction. The circumferential size of a portion of the inner portion 34a circumferentially sandwiched between the two first divided portions 34c is smaller than the circumferential size of the outer portion 34b.

図２および図７に示されるように、ストッパ弾性部３４と端弾性体３１とは、軸方向に分断されている。この分断部分（以下、第２分断部分という）３４ｄは、ストッパ弾性部３４を径方向に貫通し、かつ軸方向の幅を有して、周方向に延びる長孔となっている。第２分断部分３４ｄは、ストッパ弾性部３４における軸方向の両端部に形成されている。第２分断部分３４ｄは、ストッパ弾性部３４のうちの内側部分３４ａと、端弾性体３１と、を軸方向に分断している。なお、第２分断部分３４ｄは、内側部分３４ａおよび外側部分３４ｂを含むストッパ弾性部３４の全体と、端弾性体３１と、を軸方向に分断してもよい。 As shown in FIGS. 2 and 7, the stopper elastic portion 34 and the end elastic body 31 are separated in the axial direction. The divided portion (hereinafter referred to as a second divided portion) 34d penetrates the stopper elastic portion 34 in the radial direction, has an axial width, and is an elongated hole extending in the circumferential direction. The second divided portions 34 d are formed at both axial end portions of the stopper elastic portion 34. The second divided portion 34 d axially divides the inner portion 34 a of the stopper elastic portion 34 and the end elastic body 31. The second divided portion 34d may axially divide the whole of the stopper elastic portion 34 including the inner portion 34a and the outer portion 34b and the end elastic body 31.

第２分断部分３４ｄにおける軸方向の外端は、外側部分３４ｂにおける軸方向の端部より軸方向の外側に位置し、第２分断部分３４ｄにおける軸方向の内端は、外側部分３４ｂにおける軸方向の端部より軸方向の内側に位置している。第２分断部分３４ｄは、ストッパ部１６の頂面１５ａにおいて、その軸方向の端縁より軸方向の内側で、かつ窪み部１６ａの開口部より軸方向の外側に位置する部分に位置している。第２分断部分３４ｄは、ストッパ弾性部３４において、２つの外側部分３４ｂより周方向の内側に位置する部分に配置されている。
図示の例では、第２分断部分３４ｄの周方向の端部は、第１分断部分３４ｃの軸方向の端部に接続され、第２分断部分３４ｄおよび第１分断部分３４ｃは、径方向の外側から見て矩形枠状を呈する。第２分断部分３４ｄの幅は、第１分断部分３４ｃの幅よりわずかに大きくなっている。 The axial outer end of the second divided portion 34d is located axially outside of the axial end of the outer portion 34b, and the axial inner end of the second divided portion 34d is located in the axial direction of the outer portion 34b. Located axially inward of the end of the. The second divided portion 34d is located on the top surface 15a of the stopper portion 16 at a position axially inside the axial end edge and at the outside axially of the opening of the recess 16a. . The second divided portion 34 d is disposed in a portion of the stopper elastic portion 34 located inward in the circumferential direction than the two outer portions 34 b.
In the illustrated example, the circumferential end of the second divided portion 34d is connected to the axial end of the first divided portion 34c, and the second divided portion 34d and the first divided portion 34c are radially outward. It has a rectangular frame shape as viewed from the side. The width of the second divided portion 34d is slightly larger than the width of the first divided portion 34c.

内側取付部材１１と外筒１２との間に、周方向に互いに隣り合う中弾性体３２同士の間を径方向の外側から覆い内側取付部材１１との間に液室１４ａ、１４ｂを画成する被覆部材１７が配設されている。被覆部材１７は、弾性体３１、３２を形成する材質より硬質の、例えば合成樹脂材料等で形成されている。ストッパ部１６およびストッパ弾性部３４は、周方向で互いに隣り合う中弾性体３２同士の間に配設され、液室１４ａ、１４ｂの隔壁の一部を構成している。 Between the inner attachment member 11 and the outer cylinder 12, the liquid chambers 14a and 14b are defined between the middle elastic members 32 adjacent to each other in the circumferential direction from the outer side in the radial direction and between the inner attachment member 11. A covering member 17 is disposed. The covering member 17 is formed of, for example, a synthetic resin material or the like harder than the material forming the elastic bodies 31 and 32. The stopper portion 16 and the stopper elastic portion 34 are disposed between the middle elastic bodies 32 adjacent to each other in the circumferential direction, and constitute a part of the partition walls of the liquid chambers 14a and 14b.

液室１４ａ、１４ｂに、４０℃における動粘度が５０ｃＳｔ以上１０００ｃＳｔ以下、好ましくは５００ｃＳｔ以上１０００ｃＳｔ以下の液体が封入されている。動粘度の測定は、ＪＩＳＫ２２８３に準拠し、Ｂ型粘度計（（株）トキメック製）により行った。液体としては、例えばシリコーンオイル等が挙げられる。
被覆部材１７は、内側取付部材１１を全周にわたって径方向の外側から囲繞している。
被覆部材１７の内面は、中弾性体３２の外面に液密に当接し、ストッパ弾性部３４とは非接触となっている。 In the liquid chambers 14a and 14b, a liquid having a kinematic viscosity at 40 ° C. of 50 cSt or more and 1000 cSt or less, preferably 500 cSt or more and 1000 cSt or less is sealed. The measurement of the kinematic viscosity was performed using a B-type viscometer (manufactured by Tokimec Co., Ltd.) in accordance with JIS K2283. Examples of the liquid include silicone oil and the like.
The covering member 17 surrounds the inner mounting member 11 from the outer side in the radial direction over the entire circumference.
The inner surface of the covering member 17 is in fluid-tight contact with the outer surface of the middle elastic body 32 and is not in contact with the stopper elastic portion 34.

ここで、図２に示されるように、ストッパ弾性部３４における、被覆部材１７の内面と対向する外表面のうち、少なくとも窪み部１６ａ上に位置する対応部分、および被覆部材１７の内面のうち、少なくともストッパ弾性部３４の外表面の前記対応部分と対向する対向部分は、軸方向に沿う縦断面視において、全域にわたって軸方向に延びている。図示の例では、前記縦断面視において、ストッパ弾性部３４の外表面の前記対応部分、および被覆部材１７の内面の前記対向部分は、ほぼ平行になっている。 Here, as shown in FIG. 2, of the outer surface of the stopper elastic portion 34 facing the inner surface of the covering member 17, at least the corresponding portion located on the recess 16 a and the inner surface of the covering member 17, At least a facing portion facing the corresponding portion of the outer surface of the stopper elastic portion 34 extends in the axial direction over the entire region in a longitudinal sectional view along the axial direction. In the illustrated example, the corresponding portion of the outer surface of the stopper elastic portion 34 and the opposed portion of the inner surface of the covering member 17 are substantially parallel in the longitudinal cross-sectional view.

被覆部材１７の内面のうち、ストッパ部１６の頂面１５ａにおける窪み部１６ａの開口周縁部にストッパ弾性部３４を介して径方向に対向する部分から前記対向部分にわたって、前記縦断面視で軸方向に延びている。被覆部材１７の内面のうち、ストッパ部１６における軸方向の端部にストッパ弾性部３４を介して径方向に対向する部分は、軸方向の外側に向かうに従い漸次、径方向の外側に向けて延びている。 Of the inner surface of the covering member 17, the opening peripheral edge portion of the hollow portion 16a in the top surface 15a of the stopper portion 16 extends radially from the portion facing the radial direction through the stopper elastic portion 34, the axial direction in the longitudinal cross section It extends to A portion of the inner surface of the covering member 17 which is radially opposed to the axial end of the stopper portion 16 via the stopper elastic portion 34 gradually extends outward in the radial direction toward the axial outer side. ing.

図１に示されるように、被覆部材１７の内面のうち、ストッパ弾性部３４の内側部分３４ａの外表面と対向する部分は、中心軸線Ｏを中心とする円弧形状に形成され、ストッパ弾性部３４の外側部分３４ｂの外表面と対向する部分は、径方向の外側に向けて窪む凹曲面状に形成されている。中心軸線Ｏに直交する横断面視において、被覆部材１７の内面のうち、ストッパ弾性部３４の内側部分３４ａの外表面と対向する部分の曲率半径は、ストッパ弾性部３４の外側部分３４ｂの外表面と対向する部分の曲率半径より大きい。被覆部材１７の内面のうち、ストッパ弾性部３４の外表面と対向する部分は、ストッパ弾性部３４の外表面形状に沿った形状に形成されている。前記横断面視において、被覆部材１７の内面のうち、ストッパ弾性部３４の外表面と対向する部分は、ストッパ弾性部３４の外表面とほぼ平行となっている。 As shown in FIG. 1, of the inner surface of the covering member 17, a portion facing the outer surface of the inner portion 34 a of the stopper elastic portion 34 is formed in an arc shape centered on the central axis O, and the stopper elastic portion 34 is formed. The portion of the outer portion 34 b facing the outer surface is formed in the shape of a concave surface that is recessed outward in the radial direction. In a cross-sectional view perpendicular to the central axis O, the curvature radius of the portion of the inner surface of the covering member 17 facing the outer surface of the inner portion 34a of the stopper elastic portion 34 is the outer surface of the outer portion 34b of the stopper elastic portion 34. And the radius of curvature of the opposing part. Of the inner surface of the covering member 17, a portion facing the outer surface of the stopper elastic portion 34 is formed in a shape along the outer surface shape of the stopper elastic portion 34. In the cross-sectional view, a portion of the inner surface of the covering member 17 facing the outer surface of the stopper elastic portion 34 is substantially parallel to the outer surface of the stopper elastic portion 34.

被覆部材１７は、周方向に沿って複数配設され、周端縁同士が互いに突き当てられて全体で円筒状をなす。図示の例では、被覆部材１７は、半割りの筒状に形成され２つ配設されている。被覆部材１７は、中弾性体３２を全周にわたって覆っている。被覆部材１７の周端縁は、中弾性体３２における周方向の中央部に位置している。 A plurality of covering members 17 are disposed along the circumferential direction, and circumferential edges thereof abut each other to form a cylindrical shape as a whole. In the illustrated example, two covering members 17 are formed in a half cylindrical shape. The covering member 17 covers the middle elastic body 32 all around. The peripheral edge of the covering member 17 is located at the circumferential center of the middle elastic body 32.

被覆部材１７は、中弾性体３２を、径方向の内側、および周方向の内側に圧縮変形させている。つまり、中弾性体３２には、径方向の両方向、および周方向の両方向に圧縮力が加えられている。図示の例では、１つの被覆部材１７の内面における周方向の両端部に、径方向の内側に向けて突出し、中弾性体３２の周方向の端面に圧接する圧接突部１７ｆが各別に形成されている。圧接突部１７ｆにおいて、中弾性体３２の周方向の端面に圧接する圧接面は、１つの被覆部材１７における周方向の外側を向き、かつ軸方向に延びる平面となっている。 The covering member 17 compresses and deforms the middle elastic body 32 radially inward and circumferentially inward. That is, compressive force is applied to the intermediate elastic body 32 in both the radial direction and the circumferential direction. In the illustrated example, at each end of the inner surface of one covering member 17 in the circumferential direction, pressing projections 17f are formed separately, which project radially inward and press against the circumferential end surface of the middle elastic body 32. ing. In the pressing protrusion 17f, the pressing surface pressed against the circumferential end surface of the middle elastic body 32 is a flat surface that faces the outer side in the circumferential direction of one covering member 17 and extends in the axial direction.

図４に示されるように、被覆部材１７の外周面に、本体溝１９と、各液室１４ａ、１４ｂのうちのいずれか一方の液室１４ａ、および本体溝１９に開口する第１連通開口１８と、各液室１４ａ、１４ｂのうちのいずれか他方の液室１４ｂ、および本体溝１９に開口する第２連通開口２０と、が形成されている。 As shown in FIG. 4, on the outer peripheral surface of the covering member 17, a main communication groove 18, and one of the liquid chambers 14 a and 14 b, a first communication opening 18 opened to the liquid chamber 14 a and the main groove 19. And the second communication opening 20 opened to the main body groove 19 and the other liquid chamber 14 b of the liquid chambers 14 a and 14 b.

第１連通開口１８、および第２連通開口２０はそれぞれ、２つの被覆部材１７それぞれにおいて、周方向で互いに隣接する周端部に各別に形成されている。
図４および図５に示されるように、本体溝１９は、被覆部材１７の外周面において、第１連通開口１８若しくは第２連通開口２０が配置された周方向の一端部から、周方向の他端部に向けて延び、周方向の他端部が周方向に開口した第１溝１９ａと、第１溝１９ａから軸方向に離れた位置に配置され、周方向の両端部が周方向に開口した第２溝１９ｂと、を備えている。第１溝１９ａにおける周方向の一端部は、軸方向に延びる端壁部１９ｃにより周方向に閉塞されている。 The first communication opening 18 and the second communication opening 20 are respectively formed at circumferential ends adjacent to each other in the circumferential direction in each of the two covering members 17.
As shown in FIGS. 4 and 5, in the outer peripheral surface of the covering member 17, the main body groove 19 extends from the one end portion in the circumferential direction where the first communication opening 18 or the second communication opening 20 is disposed. The first groove 19a extends toward the end, and the other end in the circumferential direction is disposed at a position axially separated from the first groove 19a, and both ends in the circumferential direction are open in the circumferential direction. And the second groove 19b. One end of the first groove 19a in the circumferential direction is closed in the circumferential direction by an end wall 19c extending in the axial direction.

そして、２つの被覆部材１７は、同等の形状で同等の大きさに形成され、それぞれが軸方向に反転した状態で、周端縁同士が周方向に連ねられて配置されている。
これにより、一方の被覆部材１７における第１溝１９ａの周方向の他端部と、他方の被覆部材１７における第２溝１９ｂの周方向の他端部と、が互いに接続され、一方の被覆部材１７における第２溝１９ｂの周方向の一端部と、他方の被覆部材１７における第２溝１９ｂの周方向の一端部と、が互いに接続され、一方の被覆部材１７における第２溝１９ｂの周方向の他端部と、他方の被覆部材１７における第１溝１９ａの周方向の他端部と、が互いに接続されている。 The two covering members 17 are formed in the same shape and in the same size, and in the state in which the two covering members 17 are respectively reversed in the axial direction, the peripheral edges are arranged in a row in the circumferential direction.
Thereby, the other end of the first groove 19a in one covering member 17 in the circumferential direction and the other end of the second groove 19b in the other covering member 17 in the circumferential direction are connected to each other, and one covering member The one end portion of the second groove 19b in the circumferential direction 17 and the one end portion of the second groove 19b in the other covering member 17 are connected to each other, and the circumferential direction of the second groove 19b in one covering member 17 The other end of the first cover 19 and the other end in the circumferential direction of the first groove 19a of the other covering member 17 are connected to each other.

ここで、図４に示されるように、端壁部１９ｃにおける周方向の両側面のうち、第１溝１９ａの外側に位置する外側面１９ｄは、軸方向に第２溝１９ｂから離れるに従い漸次、第１溝１９ａの外側に向けて延びている。これにより、一方の被覆部材１７における第２溝１９ｂの周方向の一端部と、他方の被覆部材１７における第２溝１９ｂの周方向の一端部と、が、２つの被覆部材１７における端壁部１９ｃの外側面１９ｄ間の間隙を通して接続されている。２つの被覆部材１７における端壁部１９ｃの外側面１９ｄは、互いにほぼ平行となり、この間隙は、軸方向および周方向の双方向に傾斜する方向に直線状に延びている。 Here, as shown in FIG. 4, among the side surfaces in the circumferential direction of the end wall portion 19 c, the outer side surface 19 d located outside the first groove 19 a gradually increases in the axial direction as it is separated from the second groove 19 b, It extends to the outside of the first groove 19a. Thus, one end of the second groove 19 b in one covering member 17 in the circumferential direction and one end of the second groove 19 b in the other covering member 17 in the circumferential direction are end wall portions of the two covering members 17. It is connected through the gap between the outer surface 19d of 19c. The outer surfaces 19d of the end walls 19c of the two covering members 17 are substantially parallel to each other, and the gap linearly extends in a direction inclined in both the axial direction and the circumferential direction.

外筒１２が、２つの被覆部材１７に一体に外嵌することによって、外筒１２と内側取付部材１１とが弾性的に連結されるとともに、本体溝１９と外筒１２の内周面との間に、各液室１４ａ、１４ｂ同士を連通するオリフィス通路が画成されている。オリフィス通路は、第１連通開口１８、および第２連通開口２０を通して、各液室１４ａ、１４ｂ同士を連通している。オリフィス通路は、被覆部材１７と外筒１２との間に、周方向に１周半以上にわたって延設されている。図示の例では、オリフィス通路は、被覆部材１７と外筒１２との間に、周方向にほぼ２周にわたって延設されている。
そして、この防振装置１に振動が入力されたときに、弾性体３１、３２が弾性変形しつつ、各液室１４ａ、１４ｂの内容積が変動することで、液室１４ａ、１４ｂ内の液体がオリフィス通路を流通して液柱共振を生じさせることにより振動が減衰、吸収される。 As the outer cylinder 12 is integrally fitted to the two covering members 17, the outer cylinder 12 and the inner mounting member 11 are elastically connected, and the main groove 19 and the inner peripheral surface of the outer cylinder 12 An orifice passage communicating the liquid chambers 14a and 14b with each other is defined therebetween. The orifice passage communicates the liquid chambers 14 a and 14 b with each other through the first communication opening 18 and the second communication opening 20. The orifice passage is extended between the covering member 17 and the outer cylinder 12 along the circumferential direction for one and a half or more. In the illustrated example, the orifice passage is extended between the covering member 17 and the outer cylinder 12 along substantially two rounds in the circumferential direction.
Then, when vibration is input to the vibration isolation device 1, the elastic bodies 31, 32 elastically deform and the internal volumes of the liquid chambers 14a, 14b fluctuate, so that the liquid in the liquid chambers 14a, 14b is changed. The vibration is damped and absorbed by flowing through the orifice passage to cause liquid column resonance.

オリフィス通路を画成する壁面に、このオリフィス通路内を一方の液室１４ａから他方の液室１４ｂに向けて流通する液体を、他方の液室１４ｂ内に短絡して到達させる第１短絡貫通孔２１、および、このオリフィス通路内を他方の液室１４ｂから一方の液室１４ａに向けて流通する液体を、一方の液室１４ａ内に短絡して到達させる第２短絡貫通孔２２が形成されている。
第１短絡貫通孔２１、および第２短絡貫通孔２２を通過する液体の流通抵抗は、オリフィス通路の流通抵抗より小さい。第１短絡貫通孔２１、および第２短絡貫通孔２２の各流路断面積は、例えば約３ｍｍ^２以上とされ、オリフィス通路の流路断面積より小さい。第１短絡貫通孔２１、および第２短絡貫通孔２２の各長さは、オリフィス通路の長さより短い。 A first short-circuited through-hole for causing a liquid flowing in the orifice passage from one liquid chamber 14a to the other liquid chamber 14b to reach the wall surface defining the orifice passage by short circuiting the other liquid chamber 14b 21 and a second short-circuited through hole 22 is formed for causing a liquid flowing from the other liquid chamber 14 b to the one liquid chamber 14 a from the other liquid chamber 14 b to reach the one liquid chamber 14 a by a short circuit. There is.
The flow resistance of the liquid passing through the first short circuit through hole 21 and the second short circuit through hole 22 is smaller than the flow resistance of the orifice passage. Each flow passage cross-sectional area of the first short circuit through hole 21 and the second short circuit through hole 22 is, for example, about 3 mm ² or more, which is smaller than the flow passage cross sectional area of the orifice passage. Each length of the first short circuit through hole 21 and the second short circuit through hole 22 is shorter than the length of the orifice passage.

第１短絡貫通孔２１、および第２短絡貫通孔２２は、被覆部材１７の外周面に形成され、本体溝１９の溝底面に形成されている。第１短絡貫通孔２１、および第２短絡貫通孔２２は、２つの被覆部材１７に各別に形成されている。第１短絡貫通孔２１、および第２短絡貫通孔２２は、第２溝１９ｂにおける周方向の両端部のうち、他の被覆部材１７における第１溝１９ａの周方向の他端部に接続された他端部に形成されている。これにより、第１短絡貫通孔２１は、他方の液室１４ｂにおいて、オリフィス通路内を液体が一方の液室１４ａから他方の液室１４ｂに向けて流通する流通方向Ｆ１の後側の端部に開口している。第２短絡貫通孔２２は、一方の液室１４ａにおいて、オリフィス通路内を液体が他方の液室１４ｂから一方の液室１４ａに向けて流通する流通方向Ｆ２の後側の端部に開口している。 The first short circuit through hole 21 and the second short circuit through hole 22 are formed on the outer peripheral surface of the covering member 17 and are formed on the bottom of the main groove 19. The first short through holes 21 and the second short through holes 22 are separately formed in the two covering members 17. The first short circuit through hole 21 and the second short circuit through hole 22 are connected to the other end of the second groove 19b in the circumferential direction of the first groove 19a in the other covering member 17 among the two circumferential ends of the second groove 19b. It is formed at the other end. Thereby, in the other liquid chamber 14b, the first short circuit through hole 21 is provided at the rear end of the flow direction F1 in which the liquid flows from the one liquid chamber 14a toward the other liquid chamber 14b in the orifice passage. It is open. The second short circuit through hole 22 is opened at the rear end of the flow direction F2 in which the liquid flows from the other liquid chamber 14b toward the one liquid chamber 14a in the orifice passage in the one liquid chamber 14a. There is.

第１短絡貫通孔２１は、第１連通開口１８から流通方向Ｆ１に沿って中心軸線Ｏを中心に約１８０°離れた位置に配置され、第２短絡貫通孔２２は、第２連通開口２０から流通方向Ｆ２に沿って中心軸線Ｏを中心に約１８０°離れた位置に配置されている。
第１短絡貫通孔２１、および第２短絡貫通孔２２は、第２溝１９ｂにおける軸方向の中央部に配置されている。第１短絡貫通孔２１、および第２短絡貫通孔２２それぞれにおける本体溝１９の溝底面における開口形状は、周方向に長い長円形状となっている。 The first short circuit through hole 21 is disposed at a position about 180 degrees away from the first communication opening 18 along the flow direction F1 about the central axis O, and the second short circuit through hole 22 is formed from the second communication opening 20 It is disposed at a position about 180 ° apart from the central axis O along the flow direction F2.
The first short circuit through hole 21 and the second short circuit through hole 22 are disposed at the axial center of the second groove 19b. The opening shape at the groove bottom of the main body groove 19 in each of the first short circuit through hole 21 and the second short circuit through hole 22 is an elongated circular shape elongated in the circumferential direction.

第１短絡貫通孔２１の内周面のうち、液体がオリフィス通路内を一方の液室１４ａから他方の液室１４ｂに向けて流通する流通方向Ｆ１の後側の端部に位置し、流通方向Ｆ１の前側を向く後端面２１ａは、径方向の外側から内側に向かうに従い漸次、流通方向Ｆ１の前側に向けて延びている。図示の例では、第１短絡貫通孔２１の内周面のうち、流通方向Ｆ１の前側の端部に位置し、流通方向Ｆ１の後側を向く前端面２１ｂも、径方向の外側から内側に向かうに従い漸次、流通方向Ｆ１の前側に向けて延びている。第１短絡貫通孔２１における後端面２１ａおよび前端面２１ｂはほぼ平行になっている。 It is located at the end on the rear side of the flow direction F1 in which the liquid circulates in the orifice passage from one liquid chamber 14a to the other liquid chamber 14b on the inner peripheral surface of the first short circuit through hole 21 The rear end face 21a facing the front side of F1 gradually extends toward the front side of the flow direction F1 as it goes from the radially outer side to the inner side. In the illustrated example, of the inner peripheral surfaces of the first short circuit through holes 21, the front end 21b located at the front end of the flow direction F1 and facing the back of the flow direction F1 is also from the outside in the radial direction As it goes, it gradually extends toward the front side of the flow direction F1. The rear end face 21a and the front end face 21b of the first short circuit through hole 21 are substantially parallel.

第２短絡貫通孔２２の内周面のうち、液体がオリフィス通路内を他方の液室１４ｂから一方の液室１４ａに向けて流通する流通方向Ｆ２の後側の端部に位置し、流通方向Ｆ２の前側を向く後端面２２ａは、径方向の外側から内側に向かうに従い漸次、流通方向Ｆ２の前側に向けて延びている。図示の例では、第２短絡貫通孔２２の内周面のうち、流通方向Ｆ２の前側の端部に位置し、流通方向Ｆ２の後側を向く前端面２２ｂも、径方向の外側から内側に向かうに従い漸次、流通方向Ｆ２の前側に向けて延びている。第２短絡貫通孔２２における後端面２２ａおよび前端面２２ｂはほぼ平行になっている。 It is located at the end on the rear side of the flow direction F2 in which the liquid circulates in the orifice passage from the other liquid chamber 14b to the one liquid chamber 14a on the inner peripheral surface of the second short circuit through hole 22 The rear end surface 22a facing the front side of F2 gradually extends toward the front side in the flow direction F2 from the radially outer side toward the inner side. In the illustrated example, of the inner peripheral surfaces of the second short circuit through holes 22, the front end face 22b located at the front end of the flow direction F2 and facing the back of the flow direction F2 is also from the outside in the radial direction It gradually extends toward the front side of the flow direction F2 as it goes. The rear end face 22a and the front end face 22b of the second short circuit through hole 22 are substantially parallel.

図４に示されるように、オリフィス通路において、一方の液室１４ａとの接続部分を画成する壁面に、他方の液室１４ｂとの接続部分側に短絡して開口する第３短絡貫通孔２３、および、他方の液室１４ｂとの接続部分を画成する壁面に、一方の液室１４ａとの接続部分側に短絡して開口する第４短絡貫通孔２４が形成されている。 As shown in FIG. 4, in the orifice passage, a third shorted through hole 23 is short-circuited and opened on the side of the connecting portion with the other liquid chamber 14 b on the wall surface defining the connecting portion with the one liquid chamber 14 a. And, on the wall surface defining the connecting portion with the other liquid chamber 14b, a fourth short circuit through hole 24 which is opened by shorting to the connecting portion side with the one liquid chamber 14a is formed.

第３短絡貫通孔２３、および第４短絡貫通孔２４の各流通抵抗は、オリフィス通路の流通抵抗より小さく、第１短絡貫通孔２１、および第２短絡貫通孔２２の各流通抵抗より小さい。第３短絡貫通孔２３、および第４短絡貫通孔２４の各流路断面積は、例えば約３ｍｍ^２以上とされ、オリフィス通路の流路断面積、並びに、第１連通開口１８、および第２連通開口２０の各開口面積より小さい。第３短絡貫通孔２３、および第４短絡貫通孔２４の各長さは、オリフィス通路の長さより短い。
なお、第３短絡貫通孔２３、および第４短絡貫通孔２４の各流通抵抗を、第１短絡貫通孔２１、および第２短絡貫通孔２２の各流通抵抗以上としてもよい。 The flow resistances of the third short circuit through hole 23 and the fourth short circuit through hole 24 are smaller than the flow resistance of the orifice passage and smaller than the flow resistances of the first short circuit through hole 21 and the second short through hole 22. The flow passage cross-sectional area of each of the third short circuit through hole 23 and the fourth short circuit through hole 24 is, for example, about 3 mm ² or more, and the flow passage cross sectional area of the orifice passage and the first communication opening 18 and the second communication It is smaller than each opening area of the opening 20. Each length of the third short circuit through hole 23 and the fourth short circuit through hole 24 is shorter than the length of the orifice passage.
The flow resistances of the third short circuit through hole 23 and the fourth short circuit through hole 24 may be equal to or higher than the flow resistances of the first short circuit through hole 21 and the second short circuit through hole 22.

第３短絡貫通孔２３、および第４短絡貫通孔２４は、第１溝１９ａにおける周方向の一端部を画成し、かつ軸方向に延びる端壁部１９ｃに形成され、周方向に延びている。第３短絡貫通孔２３、および第４短絡貫通孔２４は、端壁部１９ｃの表面のうち、径方向の外側を向く外周面に形成され、端壁部１９ｃを周方向に貫いている。第３短絡貫通孔２３、および第４短絡貫通孔２４は、径方向の外側から見た正面視で、軸方向に直交する方向に直線状に延びている。 The third short circuit through hole 23 and the fourth short circuit through hole 24 define one end in the circumferential direction of the first groove 19a and are formed in the end wall 19c extending in the axial direction, and extend in the circumferential direction . The third short circuit through hole 23 and the fourth short circuit through hole 24 are formed on the outer peripheral surface facing the outer side in the radial direction among the surfaces of the end wall 19 c and penetrate the end wall 19 c in the circumferential direction. The third short circuit through hole 23 and the fourth short circuit through hole 24 linearly extend in the direction orthogonal to the axial direction in a front view as viewed from the outer side in the radial direction.

第３短絡貫通孔２３は、オリフィス通路内を液体が一方の液室１４ａから他方の液室１４ｂに向けて流通する流通方向Ｆ１の逆方向に開口し、第４短絡貫通孔２４は、オリフィス通路内を液体が他方の液室１４ｂから一方の液室１４ａに向けて流通する流通方向Ｆ２の逆方向に開口している。第３短絡貫通孔２３、および第４短絡貫通孔２４は、他方の被覆部材１７における第２溝１９ｂの周方向の一端部に向けて開口している。 The third short circuit through hole 23 opens in the orifice passage in the direction opposite to the flow direction F1 in which the liquid circulates from one liquid chamber 14a to the other liquid chamber 14b in the orifice passage, and the fourth short circuit through hole 24 is the orifice passage The liquid is opened in the opposite direction of the flow direction F2 in which the liquid circulates from the other liquid chamber 14b to the one liquid chamber 14a. The third short circuit through hole 23 and the fourth short circuit through hole 24 are open toward one circumferential end of the second groove 19 b in the other covering member 17.

第３短絡貫通孔２３、および第４短絡貫通孔２４は、端壁部１９ｃにおける軸方向の中央部に形成されている。第３短絡貫通孔２３は、第１連通開口１８における軸方向の中央部に周方向に近接し、第４短絡貫通孔２４は、第２連通開口２０における軸方向の中央部に周方向に近接している。
なお、第３短絡貫通孔２３、および第４短絡貫通孔２４として、軸方向に延び、第３短絡貫通孔２３、および第４短絡貫通孔２４が形成された被覆部材１７と同一の被覆部材１７の第２溝１９ｂに開口した構成を採用してもよい。また、第３短絡貫通孔２３、および第４短絡貫通孔２４として、オリフィス通路において、一方の液室１４ａとの接続部分と、他方の液室１４ｂとの接続部分と、を短絡して直結する構成を採用してもよい。 The third short circuit through hole 23 and the fourth short circuit through hole 24 are formed at the axial center portion of the end wall 19 c. The third short circuit through hole 23 is circumferentially adjacent to the axial center of the first communication opening 18, and the fourth short circuit through hole 24 is circumferentially close to the axial central portion of the second communication opening 20. doing.
The covering member 17 which is the same as the covering member 17 in which the third short circuit through hole 23 and the fourth short circuit through hole 24 are formed as the third short circuit through hole 23 and the fourth short circuit through hole 24 is formed. The second groove 19b may be opened. Further, as the third short circuit through hole 23 and the fourth short circuit through hole 24, in the orifice passage, the connection portion with one liquid chamber 14a and the connection portion with the other liquid chamber 14b are short circuited and directly connected. A configuration may be adopted.

図３、図６および図７に示されるように、中弾性体３２には、液室１４ａ、１４ｂの内圧により弾性変形することで、各液室１４ａ、１４ｂ同士を連通し、液体を各液室１４ａ、１４ｂ同士の間を流通させる溝状のリーク通路２７、２８が形成されている。なお、リーク通路２７、２８は、各液室１４ａ、１４ｂの内圧が変動する前の待機状態では、被覆部材１７がリーク通路２７、２８の隔壁を弾性変形していることにより、リーク通路２７、２８を通した各液室１４ａ、１４ｂ同士の連通が遮断されている。
リーク通路２７、２８は、中弾性体３２において、被覆部材１７の内面に当接した外面に形成されている。リーク通路２７、２８は、中弾性体３２の、周方向を向く側面に開口している。リーク通路２７、２８は、中弾性体３２の外面を径方向の外側から見た正面視で、軸方向に直交する方向に直線状に延びている。 As shown in FIGS. 3, 6 and 7, the medium elastic body 32 is elastically deformed by the internal pressure of the liquid chambers 14 a and 14 b so that the liquid chambers 14 a and 14 b communicate with each other and the liquid Groove-like leak passages 27, 28 are formed to flow between the chambers 14a, 14b. In the standby state before the internal pressure of each of the liquid chambers 14a and 14b changes, the leak paths 27 and 28 are elastically deformed due to the covering member 17 elastically deforming the partition walls of the leak paths 27 and 28. The communication between the liquid chambers 14a and 14b through 28 is blocked.
The leak passages 27, 28 are formed in the middle elastic body 32 on the outer surface in contact with the inner surface of the covering member 17. The leak passages 27 and 28 are open at the side surface of the middle elastic body 32 facing in the circumferential direction. The leak passages 27, 28 extend linearly in the direction orthogonal to the axial direction in a front view when the outer surface of the middle elastic body 32 is viewed from the outer side in the radial direction.

リーク通路２７、２８は、中弾性体３２に軸方向の位置を異ならせて複数形成されている。図示の例では、リーク通路２７、２８は、中弾性体３２における主部３２ａおよび一対の副部３２ｂに１つずつ形成されている。
複数のリーク通路２７、２８のうち、主部３２ａに形成された第１リーク通路２７は、主部３２ａにおける軸方向の中央部に配置され、副部３２ｂに形成された第２リーク通路２８における軸方向の中央部は、副部３２ｂにおける軸方向の中央部より軸方向の外側に位置している。複数のリーク通路２７、２８のうちの少なくとも２つは、流路長が互いに異なっている。図示の例では、第１リーク通路２７の周方向の長さは、第２リーク通路２８の周方向の長さより長くなっている。第１リーク通路２７の幅は、第２リーク通路２８の幅より狭くなっている。 A plurality of leak passages 27, 28 are formed in the middle elastic body 32 at different axial positions. In the illustrated example, the leak passages 27 are formed one by one in the main portion 32 a and the pair of sub portions 32 b in the middle elastic body 32.
Of the plurality of leak passages 27, 28, the first leak passage 27 formed in the main portion 32a is disposed at the axial center of the main portion 32a, and in the second leak passage 28 formed in the sub portion 32b. The axial center portion is located axially outside of the axial center portion of the sub portion 32b. At least two of the plurality of leak passages 27, 28 have different channel lengths. In the illustrated example, the circumferential length of the first leak passage 27 is longer than the circumferential length of the second leak passage 28. The width of the first leak passage 27 is narrower than the width of the second leak passage 28.

複数のリーク通路２７、２８のうちの少なくとも２つは、被覆部材１７によるこのリーク通路２７、２８の隔壁の弾性変形量が互いに異なっている。本実施形態では、第１リーク通路２７の隔壁の被覆部材１７による弾性変形量が、第２リーク通路２８の隔壁の被覆部材１７による弾性変形量より大きくなっている。第１リーク通路２７が開く液室１４ａ、１４ｂの内圧が、第２リーク通路２８が開く液室１４ａ、１４ｂの内圧より高くなっている。
なお、第１リーク通路２７の隔壁の被覆部材１７による弾性変形量を、第２リーク通路２８の隔壁の被覆部材１７による弾性変形量以下としてもよい。また、第１リーク通路２７が開く液室１４ａ、１４ｂの内圧を、第２リーク通路２８が開く液室１４ａ、１４ｂの内圧以下としてもよい。 At least two of the plurality of leak passages 27, 28 have different amounts of elastic deformation of the partition wall of the leak passages 27, 28 by the covering member 17. In the present embodiment, the amount of elastic deformation by the covering member 17 of the partition wall of the first leak passage 27 is larger than the amount of elastic deformation by the covering member 17 of the partition wall of the second leak passage 28. The internal pressure of the fluid chambers 14a and 14b in which the first leak passage 27 opens is higher than the internal pressure of the fluid chambers 14a and 14b in which the second leak passage 28 opens.
The amount of elastic deformation by the covering member 17 of the partition wall of the first leak passage 27 may be smaller than the amount of elastic deformation by the covering member 17 of the partition wall of the second leak passage 28. Further, the internal pressure of the liquid chambers 14a and 14b in which the first leak passage 27 is opened may be equal to or less than the internal pressure of the liquid chambers 14a and 14b in which the second leak passage 28 is opened.

被覆部材１７の内面には、第１リーク通路２７内、および第２リーク通路２８内に各別に挿入された突リブ１７ａが形成されている。突リブ１７ａは、被覆部材１７の内面において、中心軸線Ｏを径方向に挟む各位置に、軸方向に間隔をあけて複数ずつ形成され、各突リブ１７ａが、第１リーク通路２７内、および第２リーク通路２８内に各別に挿入されている。突リブ１７ａは、第１リーク通路２７内、および第２リーク通路２８内にそれぞれ、周方向の全長にわたって配置されている。突リブ１７ａは、第１リーク通路２７、および第２リーク通路２８の各内面に全域にわたって当接している。 On the inner surface of the covering member 17, protruding ribs 17 a inserted separately in the first leak passage 27 and the second leak passage 28 are formed. A plurality of projecting ribs 17a are formed on the inner surface of the covering member 17 at respective positions sandwiching the central axis O in the radial direction at intervals in the axial direction, and each projecting rib 17a is formed in the first leak passage 27 and It is separately inserted into the second leak passage 28. The projecting ribs 17 a are disposed in the first leak passage 27 and the second leak passage 28 along the entire circumferential length. The projecting rib 17 a abuts on the entire inner surfaces of the first leak passage 27 and the second leak passage 28.

軸方向に間隔をあけて配置された複数の突リブ１７ａにおける周方向の各端部は、軸方向に延びる圧接突部１７ｆにより軸方向に一体に接続されている。突リブ１７ａは、１つの被覆部材１７の内面における周方向の両端部に形成されている。１つの突リブ１７ａは、被覆部材１７の周端縁で周方向に分断され、２つの被覆部材１７が周方向に組み合わされて構成されている。
なお、第１短絡貫通孔２１、第２短絡貫通孔２２、第３短絡貫通孔２３、および第４短絡貫通孔２４は、第１リーク通路２７より軸方向の外側で、かつ第２リーク通路２８より軸方向の内側に位置している。 The respective end portions in the circumferential direction of the plurality of projecting ribs 17a arranged at intervals in the axial direction are integrally connected in the axial direction by the press-contacting protrusions 17f extending in the axial direction. The protruding ribs 17 a are formed on both end portions in the circumferential direction on the inner surface of one covering member 17. One projecting rib 17a is divided in the circumferential direction at the peripheral edge of the covering member 17, and the two covering members 17 are combined in the circumferential direction.
The first short circuit through hole 21, the second short circuit through hole 22, the third short circuit through hole 23, and the fourth short circuit through hole 24 are axially outward of the first leak passage 27 and the second leak passage 28. It is located more inside in the axial direction.

以上説明したように、本実施形態による防振装置１によれば、ストッパ弾性部３４のうち外側部分３４ｂが内側部分３４ａより径方向の外側に突出しているので、ストッパ弾性部３４のうち、被覆部材１７の内面に比較的当接しやすい内側部分３４ａの摩耗を抑えることができるとともに、ストッパ弾性部３４の摩耗が進行しても、この内側部分３４ａからストッパ部１６が露出するのを抑制することができる。
しかも、ストッパ弾性部３４の内側部分３４ａが、ストッパ部１６の窪み部１６ａを覆っているので、内側部分３４ａの厚さを確保することが可能になり、この内側部分３４ａが被覆部材１７の内面に衝突したときに生ずる衝撃力を抑えることができるとともに、この内側部分３４ａからストッパ部１６が露出するのを確実に抑制することができる。 As described above, according to the anti-vibration device 1 according to the present embodiment, the outer portion 34 b of the stopper elastic portion 34 protrudes outward in the radial direction from the inner portion 34 a. It is possible to suppress the wear of the inner portion 34a which is relatively easy to abut against the inner surface of the member 17, and to suppress the exposure of the stopper portion 16 from the inner portion 34a even if the wear of the stopper elastic portion 34 progresses. Can.
Moreover, since the inner portion 34 a of the stopper elastic portion 34 covers the recessed portion 16 a of the stopper portion 16, it is possible to secure the thickness of the inner portion 34 a, and the inner portion 34 a is the inner surface of the covering member 17. It is possible to suppress the impact force generated when the vehicle is collided with and reliably suppress the exposure of the stopper portion 16 from the inner portion 34a.

また、窪み部１６ａが、ストッパ部１６の頂面１５ａにおいて、その軸方向の両端縁より軸方向の内側に位置する部分に形成されているので、ストッパ弾性部３４の内側部分３４ａが、被覆部材１７の内面に衝突したときに、ストッパ弾性部３４の内側部分３４ａのうち、窪み部１６ａ内に位置する被収容部分が全域にわたって、窪み部１６ａの内面に押し当てられることとなり、被収容部分に、過度に大きく変形して応力が集中してしまう箇所が生ずるのを抑制することが可能になり、ストッパ弾性部３４の耐久性を向上させることができる。 Further, since the recessed portion 16a is formed in the top surface 15a of the stopper portion 16 in a portion positioned inward in the axial direction from both end edges in the axial direction, the inner portion 34a of the stopper elastic portion 34 is a covering member When the inner surface 34 of the stopper elastic portion 34 collides with the inner surface of the housing 17, the housed portion positioned in the hollow portion 16a of the stopper elastic portion 34 is pressed against the inner surface of the hollow portion 16a over the entire area. It is possible to suppress the occurrence of a location where stress is concentrated due to excessive deformation, and the durability of the stopper elastic portion 34 can be improved.

また、ストッパ弾性部３４において、内側部分３４ａと外側部分３４ｂとが、周方向に分断されているので、ストッパ弾性部３４の摩耗の進行に伴い、内側部分３４ａと外側部分３４ｂとの境界部分に亀裂が発生することがなく、この亀裂が、内側部分３４ａおよび外側部分３４ｂに進展するのを防ぐことができる。これにより、ストッパ弾性部３４からストッパ部１６が露出するのを確実に抑えることができる。 Further, in the stopper elastic portion 34, since the inner portion 34a and the outer portion 34b are divided in the circumferential direction, as the wear of the stopper elastic portion 34 progresses, the boundary portion between the inner portion 34a and the outer portion 34b Cracks do not occur, and the cracks can be prevented from developing into the inner portion 34a and the outer portion 34b. Thus, exposure of the stopper portion 16 from the stopper elastic portion 34 can be reliably suppressed.

また、各液室１４ａ、１４ｂのうちのいずれか一方が縮小変形し、かつ他方が拡張変形するように、防振装置１に径方向の振動が入力されたときに、液室１４ａ、１４ｂの液体がオリフィス通路を流通することで、オリフィス通路で液柱共振が発生し、この振動が減衰、吸収される、いわゆる液封型の防振装置１において、ストッパ弾性部３４の摩耗に起因した前述の衝撃力が生ずるのを抑制することができる。
また、高粘度の液体が液室１４ａ、１４ｂに封入されているので、オリフィス通路における液柱共振に基づく減衰特性のピークが広い周波数範囲にわたって広がることとなり、広い周波数範囲で減衰性能を発揮させることができる。 When vibration in the radial direction is input to the vibration damping device 1 so that one of the liquid chambers 14a and 14b shrinks and the other expands, the liquid chambers 14a and 14b As liquid flows through the orifice passage, liquid column resonance occurs in the orifice passage, and this vibration is damped and absorbed. It is possible to suppress the occurrence of an impact force of
In addition, since the high viscosity liquid is enclosed in the liquid chambers 14a and 14b, the peak of the attenuation characteristic based on liquid column resonance in the orifice passage is spread over a wide frequency range, and the attenuation performance is exhibited in a wide frequency range. Can.

なお、本発明の技術的範囲は前記実施の形態に限定されるものではなく、本発明の趣旨を逸脱しない範囲において種々の変更を加えることが可能である。 The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the scope of the present invention.

例えば前記実施形態では、窪み部１６ａとして、軸方向に延びる溝状を示したが、これに限らず例えば、周方向に延びる溝状、径方向の外側から見て円形状、若しくは矩形状を呈する形態を採用する等、適宜変更してもよい。
また、ストッパ部１６は、内側取付部材１１の外周面から径方向の外側に向けて膨出させなくてもよい。
また、窪み部１６ａにおける軸方向の端部が、ストッパ部１６の端面１５ｂに開口した構成を採用してもよい。 For example, in the embodiment described above, the groove portion extending in the axial direction is shown as the recess portion 16a, but the groove portion extending in the circumferential direction is not limited to this, for example, a groove shape extending in the circumferential direction You may change suitably, such as adopting a form.
In addition, the stopper portion 16 may not bulge from the outer peripheral surface of the inner mounting member 11 toward the outer side in the radial direction.
Alternatively, the axial end of the recess 16 a may be open at the end surface 15 b of the stopper 16.

また、ストッパ弾性部３４に、第１分断部分３４ｃおよび第２分断部分３４ｄを形成しなくてもよく、第１分断部分３４ｃとして、内側部分３４ａおよび外側部分３４ｂが周方向で互いに当接するスリットを採用してもよく、第２分断部分３４ｄとして、ストッパ弾性部３４および端弾性体３１が軸方向で互いに当接するスリットを採用してもよい。
また、前記縦断面視で、ストッパ弾性部３４の外表面の前記対応部分、および被覆部材１７の内面の前記対向部分が、全域にわたって軸方向に延びる構成を示したが、例えば、前記対応部分および前記対向部分のうちのいずれか一方が、径方向に波打ちながら軸方向に延びる構成とする等、適宜変更してもよい。 Further, it is not necessary to form the first divided portion 34c and the second divided portion 34d in the stopper elastic portion 34, and as the first divided portion 34c, slits in which the inner portion 34a and the outer portion 34b contact each other in the circumferential direction You may employ | adopt as a 2nd division part 34d, you may employ | adopt the slit which the stopper elastic part 34 and the end elastic body 31 mutually mutually contact | abut in an axial direction.
In the longitudinal sectional view, the corresponding portion of the outer surface of the stopper elastic portion 34 and the opposed portion of the inner surface of the covering member 17 axially extend over the entire area, but, for example, the corresponding portion and Any one of the facing portions may be changed as appropriate, such as extending in the axial direction while waving in the radial direction.

また、被覆部材１７を配設せず、外筒１２により液室１４ａ、１４ｂを画成した構成を採用してもよい。
また、被覆部材１７に、第１短絡貫通孔２１、第２短絡貫通孔２２、第３短絡貫通孔２３、および第４短絡貫通孔２４を形成しなくてもよい。本体溝１９において、第１短絡貫通孔２１、第２短絡貫通孔２２、第３短絡貫通孔２３、および第４短絡貫通孔２４を形成する位置は、前記実施形態に限らず適宜変更してもよい。第１短絡貫通孔２１、および第２短絡貫通孔２２の各内周面は、例えば径方向に延びる等、適宜変更してもよい。
また、オリフィス通路として、周方向に１周以下延びる構成を採用してもよい。
また、本体溝１９が、被覆部材１７の外周面に形成された構成を示したが、本体溝１９を外筒１２の内周面に形成してもよい。 Further, the configuration in which the liquid chambers 14a and 14b are defined by the outer cylinder 12 may be adopted without arranging the covering member 17.
In addition, the first short circuit through hole 21, the second short circuit through hole 22, the third short circuit through hole 23, and the fourth short circuit through hole 24 may not be formed in the covering member 17. The positions where the first short circuit through hole 21, the second short circuit through hole 22, the third short circuit through hole 23, and the fourth short circuit through hole 24 are formed in the main body groove 19 are not limited to the above embodiment, but may be appropriately changed. Good. The inner peripheral surfaces of the first short circuit through hole 21 and the second short circuit through hole 22 may be appropriately changed, for example, by extending in the radial direction.
In addition, as the orifice passage, a configuration may be adopted which extends one or less round in the circumferential direction.
Further, although the configuration in which the main body groove 19 is formed on the outer peripheral surface of the covering member 17 is shown, the main body groove 19 may be formed on the inner peripheral surface of the outer cylinder 12.

また、オリフィス通路および液室１４ａ、１４ｂを有しない構成を採用してもよい。
また、液室１４ａ、１４ｂに封入する液体は、前記実施形態に限らず例えば、水、およびエチレングリコール等を採用してもよい。 Further, a configuration without the orifice passage and the liquid chambers 14a and 14b may be employed.
Further, the liquid sealed in the liquid chambers 14a and 14b is not limited to the above embodiment, and, for example, water, ethylene glycol or the like may be adopted.

また、中弾性体３２に補強体を埋設してもよく、また、被覆部材１７により中弾性体３２を圧縮変形しなくてもよく、また、被覆部材１７を、周方向で互いに隣り合う中弾性体３２同士の間に嵌合し、中弾性体３２を、周方向で互いに隣り合う被覆部材１７同士の間から露出させてもよい。
また、中弾性体３２に、複数のリーク通路２７、２８を形成しなくてもよい。
また、中弾性体３２として、主部３２ａおよび副部３２ｂを備える構成を示したが、例えば、主部３２ａおよび副部３２ｂのうちのいずれか一方のみを備える構成を採用する等適宜変更してもよい。 In addition, a reinforcing body may be embedded in the middle elastic body 32, and the middle elastic body 32 may not be compressed and deformed by the covering member 17. Further, the covering members 17 may be middle elasticity adjacent to each other in the circumferential direction. The middle elastic body 32 may be exposed from between the covering members 17 adjacent to each other in the circumferential direction by fitting between the bodies 32.
Further, the plurality of leak passages 27 and 28 may not be formed in the middle elastic body 32.
In addition, although the configuration including the main portion 32 a and the sub portion 32 b is shown as the middle elastic body 32, for example, a configuration including only one of the main portion 32 a and the sub portion 32 b may be adopted It is also good.

その他、本発明の趣旨を逸脱しない範囲で、前記した実施の形態における構成要素を周知の構成要素に置き換えることは適宜可能であり、また、前記した変形例を適宜組み合わせてもよい。 In addition, it is possible to replace the component in the above-mentioned embodiment with a well-known component suitably, in the range which does not deviate from the meaning of the present invention, and may combine the above-mentioned modification suitably.

１防振装置
１１内側取付部材
１２外筒
１４ａ、１４ｂ液室
１５ａ頂面
１６ストッパ部
１６ａ窪み部
１７被覆部材
３１、３２弾性体
３４ストッパ弾性部
３４ａ内側部分
３４ｂ外側部分
Ｏ中心軸線 DESCRIPTION OF SYMBOLS 1 Vibration-proof apparatus 11 Inner mounting member 12 Outer cylinder 14a, 14b Liquid chamber 15a Top surface 16 Stopper part 16a Recessed part 17 Covering member 31, 32 Elastic body 34 Stopper elastic part 34a Inner part 34b Outer part O Central axis

Claims

An inner mounting member connected to one of the vibration generating portion and the vibration receiving portion, and an outer cylinder connected to the other and surrounding the inner mounting member;
An elastic body that elastically connects the inner attachment member and the outer cylinder,
The outer peripheral surface of the inner mounting member is formed with a stopper capable of coming into contact with the inner peripheral surface of the outer cylinder when the inner mounting member and the outer cylinder move relatively close to each other.
A stopper elastic portion covering the stopper portion;
Of the stopper portion, in the circumferential intermediate portion which revolves around the central axis in a plan view seen from the axial direction along the central axis of the outer cylinder, the inner side in the radial direction intersecting the central axis in the planar view A depression is formed toward the
In the stopper elastic portion, an outer portion positioned on the outer side in the circumferential direction from an inner portion covering the depressed portion of the stopper portion protrudes outward in the radial direction from the inner portion.

The stopper portion bulges radially outward from the outer peripheral surface of the inner attachment member,
2. The apparatus according to claim 1, wherein the recessed portion is formed on a portion of the top surface of the stopper portion facing outward in the radial direction, which is positioned inward of the axial direction from both end edges in the axial direction. Vibration isolation device as described.

The anti-vibration device according to claim 1, wherein the inner portion and the outer portion are circumferentially separated.

The elastic body is separately disposed on both sides radially sandwiching the inner attachment member,
A covering member which covers between the elastic bodies adjacent to each other in the circumferential direction from the outside in the radial direction between the inner attachment member and the outer cylinder, and which forms a liquid chamber between the elastic members and the inner attachment member Arranged,
An orifice passage communicating the liquid chambers with each other is formed between the covering member and the outer cylinder.
The anti-vibration device according to any one of claims 1 to 3, wherein the stopper portion and the stopper elastic portion are disposed between the elastic bodies adjacent to each other in the circumferential direction.