JP6989355B2

JP6989355B2 - Anti-vibration device

Info

Publication number: JP6989355B2
Application number: JP2017215410A
Authority: JP
Inventors: 宏小島; 猛古郡
Original assignee: Bridgestone Corp
Current assignee: Bridgestone Corp
Priority date: 2017-11-08
Filing date: 2017-11-08
Publication date: 2022-01-05
Anticipated expiration: 2037-11-08
Also published as: JP2019086102A

Description

本発明は、防振装置に関するものである。 The present invention relates to a vibration isolator.

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 either one of a vibration generating portion and a vibration receiving portion, and an outer cylinder connected to the other and surrounding the inner mounting member, and an inner mounting member and an outer cylinder are provided. It is provided with an elastic body that is elastically connected, and protrudes outward in the radial direction on the outer peripheral surface of the inner mounting member, and when the inner mounting member and the outer cylinder move relatively close to each other in the radial direction, the outside is provided. There is known a vibration isolator in which a stopper portion capable of contacting the inner peripheral surface side of the cylinder is formed.
As this type of anti-vibration device, for example, as shown in Patent Document 1 below, a recess portion that is recessed inward in the radial direction is formed on the top surface of the stopper portion, and the top of the stopper portion is formed in this recess portion. It is known that a stopper elastic portion protruding radially outward from the surface is arranged, 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Japanese Unexamined Patent Publication No. 2004-190732

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 conventional anti-vibration device, the elastic part of the stopper is worn and the hard stopper part is exposed, and this stopper part directly collides with the inner peripheral surface side of the outer cylinder, so that a large impact force may be generated. 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 it is possible to prevent the hard stopper portion from being exposed due to the wear of the stopper elastic portion and colliding with the inner peripheral surface side of the outer cylinder. It is intended to provide a shaking 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、前記弾性体は、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に交差する径方向に、前記内側取付部材を挟む両側に各別に配設された中弾性体を備え、前記内側取付部材と前記外筒との間には、前記平面視で前記中心軸線回りに周回する周方向で互いに隣り合う前記中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、前記被覆部材の内面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、前記ストッパ部における前記軸方向の中間部分に、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ける、前記被覆部材の内面と対向する外表面のうち、少なくとも前記窪み部上に位置する対応部分、および前記被覆部材の内面のうち、少なくとも前記ストッパ弾性部の外表面の前記対応部分と対向する対向部分は、前記軸方向に沿う縦断面視において、前記軸方向に延び、前記ストッパ弾性部において、前記窪み部を覆い、かつ前記対応部分を有する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、前記内側部分と前記外側部分とは、周方向に分断され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 isolator of the present invention is connected to an inner mounting member connected to one of a vibration generating portion and a vibration receiving portion, and to the other. In addition, an outer cylinder surrounding the inner mounting member and an elastic body elastically connecting the inner mounting member and the outer cylinder are provided, and the elastic body is along the central axis of the outer cylinder. Medium elastic bodies separately arranged on both sides of the inner mounting member in the radial direction intersecting the central axis in a plan view from the axial direction are provided, and between the inner mounting member and the outer cylinder. Is a covering member that covers between the medium elastic bodies adjacent to each other in the circumferential direction around the central axis in the plan view from the outside in the radial direction and defines a liquid chamber between the inner elastic bodies and the inner mounting member. An orifice passage is formed between the covering member and the outer cylinder to communicate with each other, and the inner mounting member and the outer cylinder are relative to each other on the outer peripheral surface of the inner mounting member. A stopper portion that can come into contact with the inner surface of the covering member is formed when the covering member is moved closer to the surface, and a stopper elastic portion that covers the stopper portion is provided. A recessed portion is formed toward the inside, and of the outer surface of the stopper elastic portion facing the inner surface of the covering member, at least the corresponding portion located on the recessed portion and the inner surface of the covering member. At least, the facing portion of the outer surface of the stopper elastic portion facing the corresponding portion extends in the axial direction in a vertical cross-sectional view along the axial direction, and in the stopper elastic portion, the recessed portion is covered and the recessed portion is covered. The outer portion located outside in the circumferential direction from the inner portion having the corresponding portion is characterized in that the outer portion protrudes radially outward from the inner portion, and the inner portion and the outer portion are separated in the circumferential direction. do.

この発明によれば、ストッパ弾性部の外表面のうち、少なくとも前記対応部分が、前記縦断面視で前記軸方向に延びているので、ストッパ弾性部のうち、ストッパ部の窪み部上に位置する部分の厚さを確保することができる。したがって、前記対応部分が被覆部材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、ストッパ弾性部の摩耗に伴い、硬質のストッパ部が露出して被覆部材の内面に衝突するのを抑制することが可能になり、ストッパ弾性部の摩耗に起因して、振動の入力時に大きな衝撃力が生ずるのを抑制することができる。
また、ストッパ弾性部の外表面の前記対応部分、および被覆部材の内面の前記対向部分が、前記軸方向に沿う縦断面視において、前記軸方向に延びているので、ストッパ弾性部の外表面と被覆部材の内面とを、前記軸方向の広範囲にわたって互いに当接させることが可能になり、ストッパ弾性部にかかる負荷を抑制することができるとともに、振動の入力時に生ずる衝撃力を緩和することができる。 According to the present invention, at least the corresponding portion of the outer surface of the stopper elastic portion extends in the axial direction in the vertical cross-sectional view, so that the stopper elastic portion is located on the recessed portion of the stopper portion. The thickness of the portion can be secured. Therefore, the impact force generated when the corresponding portion collides with the inner surface of the covering member can be suppressed, and the hard stopper portion is exposed and collides with the inner surface of the covering member due to the wear of the stopper elastic portion. It becomes possible to suppress, and it is possible to suppress the generation of a large impact force at the time of input of vibration due to the wear of the stopper elastic portion.
Further, since the corresponding portion on the outer surface of the stopper elastic portion and the facing portion on the inner surface of the covering member extend in the axial direction in the vertical cross-sectional view along the axial direction, the stopper elastic portion and the outer surface thereof. The inner surface of the covering member can be brought into contact with each other over a wide range in the axial direction, the load applied to the elastic portion of the stopper can be suppressed, and the impact force generated at the time of inputting vibration can be alleviated. ..

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、前記弾性体は、前記軸方向に間隔をあけて配置されるとともに、前記外筒内に嵌合された一対の端弾性体を備え、前記端弾性体は、前記ストッパ部の表面のうち、径方向の外側を向く頂面における前記軸方向の両端部から径方向の内側に向けて延び、前記軸方向を向く両端面に各別に配設され、前記端弾性体と前記ストッパ弾性部とは、前記軸方向に分断されてもよい。 Here, the stopper portion bulges outward in the radial direction from the outer peripheral surface of the inner mounting member, and the elastic body is arranged at intervals in the axial direction and is fitted in the outer cylinder. A pair of end elastic bodies are provided, and the end elastic bodies extend radially inward from both ends in the axial direction on the top surface of the surface of the stopper portion facing outward in the radial direction. The end elastic body and the stopper elastic portion may be separately arranged on both end faces facing the direction and may be separated in the axial direction.

この場合、端弾性体とストッパ弾性部とが、前記軸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、端弾性体とストッパ弾性部との境界部分に亀裂が発生することがなく、この亀裂が、端弾性体およびストッパ弾性部に進展するのを防ぐことが可能になり、耐久性を向上させることができる。 In this case, since the end elastic body and the stopper elastic portion are separated in the axial direction, a crack is generated at the boundary portion between the end elastic body and the stopper elastic portion as the wear of the stopper elastic portion progresses. It becomes possible to prevent this crack from extending to the end elastic body and the stopper elastic portion, and the durability can be improved.

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 isolator according to the present invention, it is possible to prevent the hard stopper portion exposed due to the wear of the stopper elastic portion from colliding 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 sectional drawing in the central part in the axial direction of the vibration isolation device shown as one Embodiment which concerns on this invention. 図１に示す防振装置のＡ−Ａ線矢視断面図である。FIG. 3 is a cross-sectional view taken along the line AA of the vibration isolator shown in FIG. 図１に示す防振装置のＢ−Ｂ線矢視断面図である。FIG. 3 is a cross-sectional view taken along the line BB of the vibration isolator 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。In the vibration isolator shown in FIGS. 1 to 3, one of the two boundary portions of the two covering members is viewed from the outside in the radial direction 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。1 is a side view of the vibration isolator shown in FIGS. 1 to 3 as seen from the outside in the radial direction of the other of the two boundary portions of the two covering members 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。4 is a side view of the vibration isolator shown in FIGS. 4 and 5 in which the medium elastic body is viewed from the front with the covering member 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ストッパ弾性部を正面視した側面図である。It is a side view which looked at the stopper elastic part from the front view with the covering member removed in the vibration isolator shown in FIGS. 4 and 5.

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 the vibration isolator according to the present invention will be described with reference to FIGS. 1 to 7.
The vibration isolator 1 of the present embodiment has an inner mounting member 11 connected to either one of a vibration generating portion and a vibration receiving portion, and an outer cylinder 12 connected to the other and surrounding the inner mounting member 11. And elastic bodies 31 and 32 for elastically connecting the inner mounting member 11 and the outer cylinder 12.
The vibration isolator 1 is used, for example, as a suspension bush for an automobile, an engine mount, a mount for an industrial machine installed in a factory, or the like.
Hereinafter, the direction along the central axis O of the outer cylinder 12 is referred to as an axial direction, and in a plan view from the axial direction, the direction intersecting the central axis O is referred to as a radial direction, and the direction rotating around the central axis O is referred to. It's called 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 mounting member 11 is formed in a cylindrical shape arranged coaxially with the central axis O. A bulging portion 15 that bulges outward in the radial direction is formed in the middle portion in the axial direction of the inner mounting member 11 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 top surface 15a of the bulging portion 15 facing outward in the radial direction extends in the circumferential direction and also extends in the axial direction. The bulging portion 15 is arranged inside the outer cylinder 12. The inner diameter of the inner mounting member 11 is the same over the entire length in the axial direction. Both ends of the inner mounting member 11 in the axial direction project outward from the outer cylinder 12 in the axial direction.

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 vulcanized and bonded 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 the pair of end elastic bodies 31 fitted in the outer cylinder 12 and the end elastic bodies 31 in the circumferential direction. A pair of medium elastic bodies 32 arranged at intervals are provided.

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 ends in the axial direction on the top surface 15a of the surface of the bulging portion 15, and is separately disposed on both end faces 15b facing in the axial direction. The end surface 15b gradually extends outward in the axial direction from the top surface 15a toward the inside in the radial direction. The end elastic body 31 has a tubular portion 31a that gradually extends outward in the radial direction from the end surface 15b of the bulging portion 15 toward the outward in the axial direction, and a tubular portion 31a in the tubular portion 31a in the radial direction from the outer end in the axial direction. A flange portion 31b that protrudes outward and extends continuously over the entire circumference is provided. The tubular portion 31a and the flange portion 31b are arranged coaxially with the central axis O. The flange portion 31b is located inside the inner mounting member 11 in the axial direction from the end portion in the axial direction. An annular reinforcing plate 33 is embedded in the flange portion 31b. The reinforcing plate 33 is made of 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 medium elastic body 32 is separately arranged on both sides of the inner mounting member 11 in the radial direction. The medium elastic body 32 is made of a rubber material over the entire area. As shown in FIG. 6, the medium elastic body 32 has a main portion 32a arranged at the central portion in the axial direction of the inner mounting member 11 and a main portion 32a protruding outward from the main portion 32a in the axial direction. A pair of sub-parts 32b having a volume smaller than that of the main part 32a are provided. The main portion 32a and the sub portion 32b each exhibit a rectangular shape in which a pair of side portions extend in the circumferential direction and the remaining pair of side portions extend in the axial direction when viewed from the outside in the radial direction. The sub portion 32b is connected to the central portion in the circumferential direction of the main portion 32a. The outer end in the axial direction of the sub portion 32b is connected to the flange portion 31b of the end elastic body 31. The outer surfaces of the main portion 32a and the sub portion 32b facing outward in the radial direction are flat surfaces extending in both directions in the lateral direction and the axial direction when viewed from the outside in the radial direction. ing. The outer surfaces of the main portion 32a and the sub portion 32b are continuous without a step. The pair of medium elastic bodies 32 have the same shape and the same size. The size of the main portion 32a in the circumferential direction is larger than the size of the sub portion 32b in the circumferential direction. 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, among the bulging portions 15 of the inner mounting member 11, the stopper portions 16 located between the middle elastic bodies 32 adjacent to each other in the circumferential direction are directed inward in the radial direction. A dented portion 16a is formed. The recess 16a is formed in a groove shape extending in the axial direction. The recess 16a has a rectangular shape that is long in the axial direction when viewed from the outside in the radial direction. The stopper portion 16 is formed so as to be able to come into contact with the inner surface (inner peripheral surface side of the outer cylinder 12) of the covering member 17, which will be 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 outside the bulging portion 15 in the radial direction, and the top surface 15a of the bulging portion 15 exhibits an oval shape in a plan view seen from the axial direction. The top surface 15a of the stopper portion 16 is formed in an arc shape centered 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 16a is formed in an intermediate portion in the circumferential direction of the stopper portion 16. In the illustrated example, the recess 16a is formed at the center of the stopper 16 in the circumferential direction. As shown in FIG. 2, the recessed portion 16a is formed on the top surface 15a of the stopper portion 16 at a portion located inside in the axial direction from both end edges in the axial direction. That is, both ends of the recess 16a in the axial direction do not open to both end faces 15b of the stopper portion 16. In the illustrated example, the recessed portion 16a is formed on the top surface 15a of the stopper portion 16 at a portion located inside in the circumferential direction from both end edges in the circumferential direction. The opening of the recess 16a is formed in a protruding curved surface. The recessed portion 16a is formed in a concave curved surface shape that is recessed inward in the radial direction in a cross-sectional view orthogonal to the central axis O. Of the top surface 15a of the stopper portion 16, the portion located between the opening of the recessed portion 16a and the axial end edge of the top surface 15a is a straight line in the axial direction in a vertical cross-sectional view along the axial direction. It extends like a shape.

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 that covers the stopper portion 16 is provided. The stopper portion 16 and the stopper elastic portion 34 are arranged between the medium elastic bodies 32 adjacent to each other in the circumferential direction. The stopper elastic portion 34 and the elastic bodies 31 and 32 are integrally formed of, for example, a rubber material. 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, the outer portion 34b located outside the inner portion 34a covering the recessed portion 16a of the stopper portion 16 protrudes radially outward from the inner portion 34a. There is. The outer surface of the inner portion 34a is formed in an arc shape centered on the central axis O. The outer surface of the outer portion 34b is formed in a curved surface shape with a protrusion toward the outside in the radial direction. In the cross-sectional view orthogonal 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 separated in the circumferential direction. As shown in FIG. 7, the divided portion (hereinafter referred to as the first divided portion) 34c is formed in the stopper elastic portion 34 over the entire length in the axial direction at each connection portion between the inner portion 34a and the two outer portions 34b. Has been done. Both ends in the axial direction of the first divided portion 34c are located outside the both ends in the axial direction of the outer portion 34b. Both ends in the axial direction of the first divided portion 34c are located on the top surface 15a of the stopper portion 16 at a portion located outside the recessed portion 16a in the axial direction. As shown in FIG. 1, the first divided portion 34c is arranged on the top surface 15a of the stopper portion 16 at positions separated from both the both end edges in the circumferential direction and the opening of the recess portion 16a in the circumferential direction. ing.
The first divided portion 34c is an elongated hole that penetrates the stopper elastic portion 34 in the radial direction, has a width in the circumferential direction, and extends in the axial direction. Of the inner portion 34a, the circumferential size of the portion sandwiched between the two first divided portions 34c in the circumferential direction 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 is an elongated hole that penetrates the stopper elastic portion 34 in the radial direction, has a width in the axial direction, and extends in the circumferential direction. The second divided portion 34d is formed at both ends in the axial direction of the stopper elastic portion 34. The second divided portion 34d separately divides the inner portion 34a of the stopper elastic portion 34 and the end elastic body 31 in the axial direction. The second divided portion 34d may separately divide the entire stopper elastic portion 34 including the inner portion 34a and the outer portion 34b and the end elastic body 31 in the axial direction.

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 the axial end of the outer portion 34b, and the axial inner end of the second divided portion 34d is axially oriented at the outer portion 34b. It is located inward in the axial direction from the end of. The second divided portion 34d is located on the top surface 15a of the stopper portion 16 at a portion located inside the axial direction from the end edge in the axial direction and outside the opening portion of the recess portion 16a in the axial direction. .. The second divided portion 34d is arranged in a portion of the stopper elastic portion 34 located inside the two outer portions 34b in the circumferential direction.
In the illustrated example, the circumferential end of the second dividing portion 34d is connected to the axial end of the first dividing portion 34c, and the second dividing portion 34d and the first dividing portion 34c are radially outside. It has a rectangular frame shape when viewed from above. 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 mounting member 11 and the outer cylinder 12, the middle elastic bodies 32 adjacent to each other in the circumferential direction are covered from the outside in the radial direction, and liquid chambers 14a and 14b are defined between the inner mounting member 11 and the inner mounting member 11. The covering member 17 is arranged. The covering member 17 is made of, for example, a synthetic resin material, which is harder than the material forming the elastic bodies 31 and 32. The stopper portion 16 and the stopper elastic portion 34 are arranged between the medium elastic bodies 32 adjacent to each other in the circumferential direction, and form 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）により行える。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。 Liquid chambers 14a and 14b are filled with 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. The measurement of kinematic viscosity is based on JIS K2283 and can be performed by a B-type viscometer (manufactured by Tokimec Co., Ltd.). Examples of the liquid include silicone oil and the like.
The covering member 17 surrounds the inner mounting member 11 from the outside in the radial direction over the entire circumference. The inner surface of the covering member 17 is in liquid-tight contact with the outer surface of the medium 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 16a and the inner surface of the covering member 17. At least the facing portion of the outer surface of the stopper elastic portion 34 facing the corresponding portion extends in the axial direction over the entire area in the vertical cross-sectional view along the axial direction. In the illustrated example, in the vertical cross-sectional view, the corresponding portion on the outer surface of the stopper elastic portion 34 and the facing portion on the inner surface of the covering member 17 are substantially parallel to each other.

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, from the portion that faces the opening peripheral edge of the recessed portion 16a on the top surface 15a of the stopper portion 16 in the radial direction via the stopper elastic portion 34 to the facing portion, in the axial direction in the vertical cross-sectional view. Extends to. Of the inner surface of the covering member 17, the portion of the stopper portion 16 that faces the axial end portion in the radial direction via the stopper elastic portion 34 gradually extends outward in the radial direction toward the outer side in the axial direction. 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, a 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 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 34b facing the outer surface is formed in a concave curved surface shape that is recessed toward the outer side in the radial direction. In the cross-sectional view orthogonal to the central axis O, the radius of curvature 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. It is larger than the radius of curvature of the part facing the. The portion of the inner surface of the covering member 17 facing the outer surface of the stopper elastic portion 34 is formed in a shape that follows the outer surface shape of the stopper elastic portion 34. In the cross-sectional view, the 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 arranged along the circumferential direction, and the peripheral edges are abutted against each other to form a cylindrical shape as a whole. In the illustrated example, the covering member 17 is formed in a half-divided tubular shape and is arranged in two. The covering member 17 covers the medium elastic body 32 over the entire circumference. The peripheral edge of the covering member 17 is located at the central portion in the circumferential direction of the medium 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 medium elastic body 32 inward in the radial direction and inward in the circumferential direction. That is, compressive forces are applied to the medium elastic body 32 in both the radial direction and the circumferential direction. In the illustrated example, pressure contact protrusions 17f are separately formed at both ends in the circumferential direction on the inner surface of one covering member 17 so as to project inward in the radial direction and press contact with the peripheral end faces of the medium elastic body 32. ing. In the pressure contact protrusion 17f, the pressure contact surface that is in pressure contact with the peripheral end surface of the medium elastic body 32 is a flat surface that faces outward 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, the main body groove 19, the liquid chamber 14a of any one of the liquid chambers 14a and 14b, and the first communication opening 18 opening in the main body groove 19 And a second communication opening 20 that opens into the liquid chamber 14b of any one of the liquid chambers 14a and 14b and the main body groove 19.

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 each formed separately at peripheral ends adjacent to each other in the circumferential direction in each of the two covering members 17.
As shown in FIGS. 4 and 5, the main body groove 19 is formed in the circumferential direction from one end in the circumferential direction in which the first communication opening 18 or the second communication opening 20 is arranged on the outer peripheral surface of the covering member 17. A first groove 19a that extends toward the end and has the other end in the circumferential direction opened in the circumferential direction, and is arranged at a position axially away from the first groove 19a, and both ends in the circumferential direction open in the circumferential direction. The second groove 19b and the like are provided. One end of the first groove 19a in the circumferential direction is closed in the circumferential direction by an end wall portion 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 to have the same shape and the same size, and are arranged so that the peripheral edges are connected to each other in the circumferential direction in a state where they are inverted in the axial direction.
As a result, the other end in the circumferential direction of the first groove 19a in one covering member 17 and the other end in the circumferential direction of the second groove 19b in the other covering member 17 are connected to each other, and one covering member is connected. One end in the circumferential direction of the second groove 19b in 17 and one end in the circumferential direction 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 And the other end of the other covering member 17 in the circumferential direction of the first groove 19a 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, of the peripheral surfaces of the end wall portion 19c, the outer surface 19d located outside the first groove 19a is gradually moved away from the second groove 19b in the axial direction. It extends toward the outside of the first groove 19a. As a result, one end of the second groove 19b in one covering member 17 and one end in the circumferential direction of the second groove 19b in the other covering member 17 become end wall portions in the two covering members 17. They are connected through a gap between the outer surfaces 19d of 19c. The outer surface 19d of the end wall portion 19c of the two covering members 17 is substantially parallel to each other, and the gap extends linearly 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。 By integrally fitting the outer cylinder 12 to the two covering members 17, the outer cylinder 12 and the inner mounting member 11 are elastically connected, and the main body groove 19 and the inner peripheral surface of the outer cylinder 12 are connected to each other. An orifice passage that communicates the liquid chambers 14a and 14b with each other is defined between them. The orifice passage communicates the liquid chambers 14a and 14b with each other through the first communication opening 18 and the second communication opening 20. The orifice passage extends between the covering member 17 and the outer cylinder 12 for one and a half turns or more in the circumferential direction. In the illustrated example, the orifice passage extends substantially two times in the circumferential direction between the covering member 17 and the outer cylinder 12.
Then, when vibration is input to the vibration isolator 1, the elastic bodies 31 and 32 are elastically deformed and the internal volumes of the liquid chambers 14a and 14b fluctuate, so that the liquid in the liquid chambers 14a and 14b is liquid. The vibration is damped and absorbed by flowing through the orifice passage and causing 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-circuit through hole for allowing a liquid flowing through the orifice passage from one liquid chamber 14a toward the other liquid chamber 14b to reach the wall surface defining the orifice passage by short-circuiting it into the other liquid chamber 14b. A second short-circuit through hole 22 is formed in which the liquid flowing through the orifice passage from the other liquid chamber 14b toward the one liquid chamber 14a is short-circuited and reached in the one liquid chamber 14a. 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. The cross-sectional area of each flow path 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 path cross-sectional area of the orifice passage. The length of each 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 surface of the groove 19 of the main body groove 19. The first short-circuit through hole 21 and the second short-circuit through hole 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 in the circumferential direction of the first groove 19a in the other covering member 17 among both ends in the circumferential direction in the second groove 19b. It is formed at the other end. As a result, the first short-circuit through hole 21 is provided at the rear end of the flow direction F1 in the other liquid chamber 14b where the liquid flows from one liquid chamber 14a toward the other liquid chamber 14b in the orifice passage. It is open. The second short-circuit through hole 22 opens in one liquid chamber 14a 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. 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 arranged at a position about 180 ° away from the first communication opening 18 along the distribution direction F1 with respect to the central axis O, and the second short-circuit through hole 22 is from the second communication opening 20. It is arranged at a position about 180 ° away from the center axis O along the distribution direction F2.
The first short-circuit through hole 21 and the second short-circuit through hole 22 are arranged at the central portion in the axial direction of the second groove 19b. The opening shape at the bottom surface 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 oval shape long 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。 Of the inner peripheral surface of the first short-circuit through hole 21, the liquid is located at the rear end of the flow direction F1 in which the liquid flows from one liquid chamber 14a toward the other liquid chamber 14b in the orifice passage, and is located in the flow direction. The rear end surface 21a facing the front side of F1 gradually extends toward the front side in the distribution direction F1 from the outside in the radial direction toward the inside. In the illustrated example, of the inner peripheral surfaces of the first short-circuit through hole 21, the front end surface 21b located at the front end in the flow direction F1 and facing the rear side in the flow direction F1 is also radially from the outside to the inside. As it goes toward it, it gradually extends toward the front side of the distribution direction F1. The rear end surface 21a and the front end surface 21b in the first short-circuit through hole 21 are substantially parallel to each other.

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。 Of the inner peripheral surface of the second short-circuit through hole 22, the liquid is located 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, and is located in the flow direction. The rear end surface 22a facing the front side of F2 gradually extends toward the front side in the distribution direction F2 from the outside to the inside in the radial direction. In the illustrated example, of the inner peripheral surfaces of the second short-circuit through hole 22, the front end surface 22b located at the front end in the flow direction F2 and facing the rear side in the flow direction F2 is also radially from the outside to the inside. As it goes toward it, it gradually extends toward the front side of the distribution direction F2. The rear end surface 22a and the front end surface 22b of the second short-circuit through hole 22 are substantially parallel to each other.

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 short-circuit through hole 23 is opened by short-circuiting to the wall surface defining the connection portion with one liquid chamber 14a and toward the connection portion side with the other liquid chamber 14b. , And a fourth short-circuit through hole 24 is formed on the wall surface defining the connection portion with the other liquid chamber 14b so as to be short-circuited and opened on the connection portion side with the one liquid chamber 14a.

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 resistance of the third short-circuit through hole 23 and the fourth short-circuit through hole 24 is smaller than the flow resistance of the orifice passage and smaller than the flow resistance of the first short-circuit through hole 21 and the second short-circuit through hole 22. The cross-sectional area of each flow path of the third short-circuit through hole 23 and the fourth short-circuit through hole 24 is set to, for example, about 3 mm ² or more, the cross-sectional area of the flow path of the orifice passage, the first communication opening 18, and the second communication. It is smaller than each opening area of the opening 20. The length of each 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 resistance 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 resistance 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 in the first groove 19a, and are formed in the end wall portion 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 of the surface of the end wall portion 19c facing outward in the radial direction, and penetrate the end wall portion 19c in the circumferential direction. The third short-circuit through hole 23 and the fourth short-circuit through hole 24 extend linearly in a direction orthogonal to the axial direction when viewed from the outside 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 flows from one liquid chamber 14a to the other liquid chamber 14b, and the fourth short-circuit through hole 24 opens in the orifice passage. The inside is opened in the direction opposite to the flow direction F2 in which the liquid flows from the other liquid chamber 14b toward the one liquid chamber 14a. The third short-circuit through hole 23 and the fourth short-circuit through hole 24 are open toward one end in the circumferential direction of the second groove 19b 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 central portion in the axial direction of the end wall portion 19c. The third short-circuit through hole 23 is circumferentially close to the axial center of the first communication opening 18, and the fourth short-circuit through hole 24 is circumferentially close to the axial center of the second communication opening 20. is doing.
The same covering member 17 as the covering member 17 extending in the axial direction and forming the third short-circuit through hole 23 and the fourth short-circuit through hole 24 as the third short-circuit through hole 23 and the fourth short-circuit through hole 24. You may adopt the structure which opened in the 2nd groove 19b of. 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. The 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 14a and 14b so that the liquid chambers 14a and 14b communicate with each other and the liquid is transferred to each liquid. Groove-shaped leak passages 27 and 28 that circulate between the chambers 14a and 14b are formed. In the leak passages 27 and 28, the covering member 17 elastically deforms the partition walls of the leak passages 27 and 28 in the standby state before the internal pressures of the liquid chambers 14a and 14b fluctuate. Communication between the liquid chambers 14a and 14b through the 28 is cut off.
The leak passages 27 and 28 are formed on the outer surface of the medium elastic body 32 that is in contact with the inner surface of the covering member 17. The leak passages 27 and 28 are open on the side surface of the medium elastic body 32 facing the circumferential direction. The leak passages 27 and 28 extend linearly in a direction orthogonal to the axial direction when the outer surface of the medium elastic body 32 is viewed from the outside 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 and 28 are formed in the medium elastic body 32 at different positions in the axial direction. In the illustrated example, the leak passages 27 and 28 are formed one by one in the main portion 32a and the pair of sub portions 32b in the medium elastic body 32.
Of the plurality of leak passages 27 and 28, the first leak passage 27 formed in the main portion 32a is arranged in the central portion in the axial direction in the main portion 32a, and is in the second leak passage 28 formed in the sub portion 32b. The central portion in the axial direction is located outside the central portion in the axial direction in the sub portion 32b. At least two of the plurality of leak passages 27 and 28 have different passage 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 and 28 have different amounts of elastic deformation of the partition walls of the leak passages 27 and 28 due to 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 liquid chambers 14a and 14b opened by the first leak passage 27 is higher than the internal pressure of the liquid chambers 14a and 14b opened by the second leak passage 28.
The amount of elastic deformation by the covering member 17 of the partition wall of the first leak passage 27 may be less than or equal to 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 opens may be set to be equal to or lower than the internal pressure of the liquid chambers 14a and 14b in which the second leak passage 28 opens.

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, protrusion ribs 17a separately inserted into the first leak passage 27 and the second leak passage 28 are formed. A plurality of protruding ribs 17a are formed on the inner surface of the covering member 17 at positions sandwiching the central axis O in the radial direction at intervals in the axial direction, and each protruding rib 17a is formed in the first leak passage 27 and in the first leak passage 27. Each is separately inserted in the second leak passage 28. The protrusion ribs 17a are arranged in the first leak passage 27 and in the second leak passage 28, respectively, over the entire length in the circumferential direction. The protruding rib 17a is in contact with the inner surfaces of the first leak passage 27 and the second leak passage 28 over the entire area.

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。 Each end portion in the circumferential direction of the plurality of protrusion ribs 17a arranged at intervals in the axial direction is integrally connected in the axial direction by a pressure contact protrusion 17f extending in the axial direction. The protruding ribs 17a are formed at both ends in the circumferential direction on the inner surface of one covering member 17. One protruding rib 17a is divided in the circumferential direction by 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 outside the first leak passage 27 and the second leak passage 28. It is located more axially inside.

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の外表面のうち、少なくとも前記対応部分が全域にわたって、前記縦断面視で軸方向に延びているので、ストッパ弾性部３４のうち、ストッパ部１６の窪み部１６ａ上に位置する部分の厚さを確保することができる。したがって、前記対応部分が被覆部材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、ストッパ弾性部３４の摩耗に伴い、硬質のストッパ部１６が露出して被覆部材１７の内面に衝突するのを抑制することが可能になり、ストッパ弾性部３４の摩耗に起因して、振動の入力時に大きな衝撃力が生ずるのを抑制することができる。
また、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、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ので、ストッパ弾性部３４の外表面と被覆部材１７の内面とを、軸方向の広範囲にわたって互いに当接させることが可能になり、ストッパ弾性部３４にかかる負荷を抑制することができるとともに、振動の入力時に生ずる衝撃力を緩和することができる。 As described above, according to the vibration isolator 1 according to the present embodiment, at least the corresponding portion of the outer surface of the stopper elastic portion 34 extends in the axial direction in the vertical cross-sectional view over the entire area, so that the stopper It is possible to secure the thickness of the portion of the elastic portion 34 located on the recessed portion 16a of the stopper portion 16. Therefore, the impact force generated when the corresponding portion collides with the inner surface of the covering member 17 can be suppressed, and the hard stopper portion 16 is exposed to the inner surface of the covering member 17 due to the wear of the stopper elastic portion 34. It is possible to suppress the collision, and it is possible to suppress the generation of a large impact force at the time of inputting vibration due to the wear of the stopper elastic portion 34.
Further, since the corresponding portion on the outer surface of the stopper elastic portion 34 and the facing portion on the inner surface of the covering member 17 extend in the axial direction over the entire area in the vertical cross-sectional view along the axial direction, the stopper elastic portion 34. The outer surface and the inner surface of the covering member 17 can be brought into contact with each other over a wide range in the axial direction, the load applied to the stopper elastic portion 34 can be suppressed, and the impact force generated at the time of inputting vibration is alleviated. can do.

また、端弾性体３１とストッパ弾性部３４とが、軸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、端弾性体３１とストッパ弾性部３４との境界部分に亀裂が発生することがなく、この亀裂が、端弾性体３１およびストッパ弾性部３４に進展するのを防ぐことが可能になり、耐久性を向上させることができる。
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。 Further, since the end elastic body 31 and the stopper elastic portion 34 are separated in the axial direction, a crack is formed at the boundary portion between the end elastic body 31 and the stopper elastic portion 34 as the wear of the stopper elastic portion 34 progresses. It does not occur, and it becomes possible to prevent the crack from extending to the end elastic body 31 and the stopper elastic portion 34, and the durability can be improved.
Further, since the highly viscous liquid is enclosed in the liquid chambers 14a and 14b, the peak of the damping characteristic based on the liquid column resonance in the orifice passage spreads over a wide frequency range, and the damping performance is exhibited in a wide frequency range. Can be done.

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-described embodiment, and various modifications can be made without departing from the spirit 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。
また、ストッパ弾性部３４の外径を全周にわたって同等にしてもよい。 For example, in the above-described embodiment, the recessed portion 16a has a groove shape extending in the axial direction, but the present invention is not limited to this, and for example, it exhibits a groove shape extending in the circumferential direction, a circular shape when viewed from the outside in the radial direction, or a rectangular shape. It may be changed as appropriate, such as adopting a form.
Further, the stopper portion 16 does not have to bulge outward from the outer peripheral surface of the inner mounting member 11 in the radial direction.
Further, a configuration may be adopted in which the end portion of the recess portion 16a in the axial direction is opened to the end surface 15b of the stopper portion 16.
Further, the outer diameter of the stopper elastic portion 34 may be the same over the entire circumference.

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。 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, a slit in which the inner portion 34a and the outer portion 34b abut with each other in the circumferential direction is provided. It may be adopted, and a slit in which the stopper elastic portion 34 and the end elastic body 31 abut against each other in the axial direction may be adopted as the second divided portion 34d.

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。
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, it is not necessary to form 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 in the covering member 17. The positions of the main body groove 19 for forming 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 not limited to the above-described embodiment and 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, extending in the radial direction.
Further, as the orifice passage, a configuration extending one or less times in the circumferential direction may be adopted.
Further, although the main body groove 19 is formed on the outer peripheral surface of the covering member 17, the main body groove 19 may be formed on the inner peripheral surface of the outer cylinder 12.
Further, the liquid to be sealed in the liquid chambers 14a and 14b is not limited to the above embodiment, and for example, water, ethylene glycol and 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。 Further, the reinforcing body may be embedded in the medium elastic body 32, the medium elastic body 32 may not be compression-deformed by the covering member 17, and the covering members 17 may be adjacent to each other in the circumferential direction. The medium elastic bodies 32 may be fitted between the bodies 32 and exposed from between the covering members 17 adjacent to each other in the circumferential direction.
Further, it is not necessary to form a plurality of leak passages 27 and 28 in the medium elastic body 32.
Further, although the configuration including the main portion 32a and the sub portion 32b is shown as the medium elastic body 32, for example, a configuration including only one of the main portion 32a and the sub portion 32b is adopted as appropriate. May be 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 appropriately replace the components in the above-described embodiment with well-known components without departing from the spirit of the present invention, and the above-mentioned modifications may be appropriately combined.

１防振装置
１１内側取付部材
１２外筒
１４ａ、１４ｂ液室
１５ａ頂面
１５ｂ端面
１６ストッパ部
１６ａ窪み部
１７被覆部材
３１端弾性体
３２中弾性体
３４ストッパ弾性部
Ｏ中心軸線 1 Anti-vibration device 11 Inner mounting member 12 Outer cylinder 14a, 14b Liquid chamber 15a Top surface 15b End surface 16 Stopper part 16a Depression part 17 Covering member 31 End elastic body 32 Medium elastic body 34 Stopper elastic part O Center axis

Claims

An inner mounting member connected to either 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 mounting member and the outer cylinder is provided.
The elastic body includes medium elastic bodies separately arranged on both sides of the inner mounting member in a radial direction intersecting the central axis in a plan view along the central axis of the outer cylinder. ,
Between the inner mounting member and the outer cylinder, the inner elastic bodies adjacent to each other in the circumferential direction that circulates around the central axis in the plan view are covered from the outside in the radial direction with the inner mounting member. A covering member that defines the liquid chamber is arranged between the two.
An orifice passage that communicates each of the liquid chambers is formed between the covering member and the outer cylinder.
On the outer peripheral surface of the inner mounting member, a stopper portion that can come into contact with the inner surface of the covering member is formed when the inner mounting member and the outer cylinder move relatively close to each other.
A stopper elastic portion that covers the stopper portion is provided.
In the middle portion of the stopper portion in the axial direction, a recess portion recessed inward in the radial direction is formed.
Of the outer surface of the stopper elastic portion facing the inner surface of the covering member, at least the corresponding portion located on the recess, and the inner surface of the covering member, at least the outer surface of the stopper elastic portion. The facing portion facing the portion extends in the axial direction in a vertical cross-sectional view along the axial direction.
In the stopper elastic portion, the outer portion that covers the recessed portion and is located outside the inner portion having the corresponding portion in the circumferential direction protrudes outward in the radial direction from the inner portion.
A vibration isolator characterized in that the inner portion and the outer portion are separated in the circumferential direction.

The stopper portion bulges outward in the radial direction from the outer peripheral surface of the inner mounting member.
The elastic bodies are arranged at intervals in the axial direction, and include a pair of end elastic bodies fitted in the outer cylinder.
The end elastic body extends radially inward from both ends in the axial direction on the top surface facing outward in the radial direction of the surface of the stopper portion, and is separately arranged on both end faces facing in the axial direction. Set up,
The vibration isolator according to claim 1, wherein the end elastic body and the stopper elastic portion are separated in the axial direction.