JP2024000660A - Vibration proof device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure sealability of a liquid flowing in an orifice passage, while suppressing production cost.

SOLUTION: A vibration proof device includes: an inside mounting member 11 connected to one of a vibration generating part and a vibration receiving part; an outer cylinder 12 connected to the other, and for surrounding the inside mounting member; and an elastic body for elastically connecting the inside mounting member and the outer cylinder. The elastic body includes middle elastic bodies disposed individually on both sides sandwiching the inside mounting member in the radial direction. Between the inside mounting member and the outer cylinder, a covering part 17 is disposed for covering a place between the middle elastic bodies adjacent to each other in the circumferential direction from the outside in the radial direction, and for defining liquid chambers 14a, 14b between itself and the inside mounting member. The elastic body includes a pair of end elastic bodies 31 which is arranged with an interval in the axial direction, which is fitted inside the outer cylinder, and which sandwiches the covering member in the axial direction. Between the end elastic body and an end surface 17a facing the axial direction out of the covering member, an orifice passage is provided for communicating the liquid chambers with each other.

SELECTED DRAWING: Figure 2

COPYRIGHT: (C)2024,JPO&INPIT

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、弾性体は、径方向に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、内側取付部材と外筒との間に、周方向で互いに隣り合う中弾性体同士の間を径方向の外側から覆い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、被覆部材と外筒との間に、各液室同士を連通するオリフィス通路が設けられた防振装置が知られている。 Conventionally, an inner mounting member is connected to one of a vibration generating section and a vibration receiving section, an outer cylinder is connected to the other and surrounds the inner mounting member, and the inner mounting member and the outer cylinder are connected to the other. an elastic body that is elastically connected, and the elastic body includes medium elastic bodies that are separately arranged on both sides sandwiching the inner mounting member in the radial direction, and a circumferential elastic body that is arranged between the inner mounting member and the outer cylinder. A covering member is disposed between the medium elastic bodies that are adjacent to each other in the radial direction from the outside in the radial direction, and defines a liquid chamber between the covering member and the outer cylinder. A vibration isolator is known that is provided with an orifice passage that communicates chambers with each other.

特開２０１９－８６１０２号公報JP 2019-86102 Publication

しかしながら、この防振装置では、オリフィス通路を流れる液体の密封性を確保するために、例えば被覆部材の寸法精度を高めたり、外筒の内周面にゴム膜を加硫接着したりする等の必要がある。これにより、製造コストを抑えつつ、オリフィス通路を流れる液体の密封性を確保することが困難になるおそれがあった。 However, in this vibration isolator, in order to ensure the sealing performance of the liquid flowing through the orifice passage, measures such as increasing the dimensional accuracy of the covering member or vulcanizing and adhering a rubber film to the inner peripheral surface of the outer cylinder are required. There is a need. This may make it difficult to ensure sealing of the liquid flowing through the orifice passage while reducing manufacturing costs.

この発明は、製造コストを抑えつつ、オリフィス通路を流れる液体の密封性を確保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。 SUMMARY OF THE INVENTION An object of the present invention is to provide a vibration isolator that can ensure sealing of liquid flowing through an orifice passage while reducing manufacturing costs.

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、かつ前記被覆部材を前記軸方向に挟む一対の端弾性体を備え、前記端弾性体と、前記被覆部材のうちの前記軸方向を向く端面と、の間に、各前記液室同士を連通するオリフィス通路が設けられている。 In order to solve the above problems and achieve such an object, the vibration isolator of the present invention includes an inner mounting member connected to either one of the vibration generating part and the vibration receiving part, and an inner mounting member connected to the other. and an outer cylinder surrounding the inner mounting member, and an elastic body elastically connecting the inner mounting member and the outer cylinder, the elastic body extending along the central axis of the outer cylinder. Medium elastic bodies are separately arranged on both sides sandwiching the inner mounting member in a radial direction intersecting the central axis in a plan view from the axial direction, and between the inner mounting member and the outer cylinder. a covering member that covers from the outside in the radial direction between the medium elastic bodies that are adjacent to each other in the circumferential direction and that revolves around the central axis in a plan view and defines a liquid chamber between the medium elastic bodies and the inner mounting member; The elastic body includes a pair of end elastic bodies that are spaced apart from each other in the axial direction, are fitted into the outer cylinder, and sandwich the covering member in the axial direction, An orifice passage that communicates the liquid chambers with each other is provided between the end elastic body and the end face of the covering member facing in the axial direction.

この発明によれば、各液室同士を連通するオリフィス通路が、弾性体の端弾性体と、被覆部材の端面と、の間に設けられているので、端弾性体を、外筒内に嵌合した状態で、被覆部材の端面に押し当てることにより、オリフィス通路を流れる液体の密封性を確実に確保することができる。
これにより、オリフィス通路を流れる液体の密封性を確保するために、例えば被覆部材の寸法精度を高めたり、外筒等の他の部材にシール用のゴム膜を加硫接着したりする等の必要を無くすことが可能になり、製造コストを抑えることができる。 According to this invention, since the orifice passage that communicates the liquid chambers with each other is provided between the end elastic body of the elastic body and the end face of the covering member, the end elastic body is fitted into the outer cylinder. By pressing them against the end face of the covering member in the assembled state, it is possible to reliably ensure the sealing performance of the liquid flowing through the orifice passage.
As a result, in order to ensure the sealing performance of the liquid flowing through the orifice passage, it is necessary, for example, to improve the dimensional accuracy of the covering member, or to vulcanize and adhere a sealing rubber film to other members such as the outer cylinder. This makes it possible to eliminate this and reduce manufacturing costs.

前記被覆部材は、前記軸方向に二分割された第１分割体および第２分割体を備え、前記オリフィス通路は、前記端弾性体と前記第１分割体の端面との間、並びに、互いに前記軸方向に突き合わされた、前記第１分割体および前記第２分割体それぞれの突き合わせ面の間に、一体に設けられてもよい。 The covering member includes a first divided body and a second divided body that are divided into two in the axial direction, and the orifice passage is formed between the end elastic body and the end surface of the first divided body, and between the end elastic body and the end face of the first divided body, and between the The first divided body and the second divided body may be integrally provided between abutting surfaces of the first divided body and the second divided body that are abutted against each other in the axial direction.

被覆部材が、前記軸方向に二分割された第１分割体および第２分割体を備え、オリフィス通路が、端弾性体と第１分割体の端面との間、並びに、互いに前記軸方向に突き合わされた、第１分割体および第２分割体それぞれの突き合わせ面の間に、一体に設けられているので、オリフィス通路を流れる液体の密封性を確実に確保しつつ、オリフィス通路の長さを容易に確保することができる。 The covering member includes a first divided body and a second divided body that are divided into two in the axial direction, and an orifice passage is provided between the end elastic body and the end face of the first divided body, and between the end elastic body and the end face of the first divided body, and that extends from each other in the axial direction. Since it is integrally provided between the abutting surfaces of the first divided body and the second divided body, it is possible to easily adjust the length of the orifice passage while ensuring the tightness of the liquid flowing through the orifice passage. can be secured.

この発明によれば、製造コストを抑えつつ、オリフィス通路を流れる液体の密封性を確保することができる。 According to this invention, it is possible to ensure the sealing performance of the liquid flowing through the orifice passage while suppressing manufacturing costs.

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。FIG. 2 is a cross-sectional view of the vibration isolator shown as an embodiment of the present invention at the center in the axial direction. 本発明に係る第１実施形態として示した、図１のＡ－Ａ線矢視断面図である。FIG. 2 is a sectional view taken along the line AA in FIG. 1, shown as a first embodiment of the present invention. 本発明に係る第２実施形態として示した、図１のＡ－Ａ線矢視断面図である。FIG. 2 is a cross-sectional view taken along the line AA in FIG. 1, shown as a second embodiment of the present invention.

以下、本発明に係る防振装置の第１実施形態を、図１および図２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, a first embodiment of a vibration isolator according to the present invention will be described with reference to FIGS. 1 and 2.
The vibration isolator 1 of this embodiment includes an inner mounting member 11 connected to either one of a vibration generating section and a vibration receiving section, and an outer cylinder 12 surrounding the inner mounting member 11 and connected to the other. and elastic bodies 31 and 32 that elastically connect the inner mounting member 11 and the outer cylinder 12.
The vibration isolator 1 is used, for example, as a suspension bush or engine mount for automobiles, or as a mount for industrial machinery installed in a factory.
Hereinafter, the direction along the central axis O of the outer cylinder 12 will be referred to as the axial direction, the direction that intersects the central axis O in plan view from the axial direction will be referred to as the radial direction, and the direction that goes around the central axis O will be referred to as the radial direction. It is called direction.

内側取付部材１１は、筒状に形成され、中心軸線Ｏと同軸に配設されている。図示の例では、内側取付部材１１は、筒状の芯金部２１と、芯金部２１の外周面に固着された樹脂部２２と、を備えている。なお、内側取付部材１１は、全体が一体に形成されてもよい。
樹脂部２２は、芯金部２１の外周面における軸方向の中間部分に設けられた中部分２６と、中部分２６から軸方向の外側に向けて各別に延びる一対の外部分２７と、を備えている。外部分２７の外周面は、中部分２６の外周面より径方向の内側に位置している。 The inner mounting member 11 is formed in a cylindrical shape and is disposed coaxially with the central axis O. In the illustrated example, the inner mounting member 11 includes a cylindrical metal core part 21 and a resin part 22 fixed to the outer peripheral surface of the metal core part 21 . Note that the inner mounting member 11 may be formed entirely in one piece.
The resin portion 22 includes a middle portion 26 provided at an axially intermediate portion of the outer peripheral surface of the core metal portion 21, and a pair of outer portions 27 each extending separately from the middle portion 26 toward the outside in the axial direction. ing. The outer circumferential surface of the outer portion 27 is located radially inner than the outer circumferential surface of the middle portion 26 .

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内に嵌合された環状の一対の端弾性体３１と、端弾性体３１同士の間において、内側取付部材１１を径方向に挟む両側に各別に配設された中弾性体３２と、を備えている。 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 spaced apart from each other in the axial direction, and are arranged between a pair of annular end elastic bodies 31 fitted in the outer cylinder 12 and an inner mounting member between the end elastic bodies 31. 11 in the radial direction, medium elastic bodies 32 are separately arranged on both sides of the elastic body 11 in the radial direction.

端弾性体３１は、外部分２７を径方向の外側から囲う端フランジ部３１ａと、端フランジ部３１ａの径方向の内端部と内側取付部材１１の外周面とを連結する端連結部３１ｂと、を備えている。 The end elastic body 31 includes an end flange portion 31a that surrounds the outer portion 27 from the outside in the radial direction, and an end connecting portion 31b that connects the radially inner end of the end flange portion 31a and the outer peripheral surface of the inner mounting member 11. , is equipped with.

端フランジ部３１ａは、周方向の全長にわたって連続して延びている。端フランジ部３１ａは、中心軸線Ｏと同軸に配置されている。端フランジ部３１ａに、周方向に延びる環状の剛体板３３が設けられている。剛体板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。剛体板３３は、端フランジ部３１ａ内に埋設されている。
端連結部３１ｂは、筒状に形成され、周方向の全長にわたって連続して延びている。端連結部３１ｂは、端フランジ部３１ａの径方向の内端部から軸方向の内側に向かうに従い、径方向の内側に向けて延びている。端連結部３１ｂは、中部分２６における軸方向の外端部に連結されている。端連結部３１ｂは、中心軸線Ｏと同軸に配置されている。 The end flange portion 31a extends continuously over the entire length in the circumferential direction. The end flange portion 31a is arranged coaxially with the central axis O. An annular rigid plate 33 extending in the circumferential direction is provided on the end flange portion 31a. The rigid plate 33 is made of a hard material such as a metal material or a synthetic resin material. The rigid plate 33 is embedded within the end flange portion 31a.
The end connecting portion 31b is formed into a cylindrical shape and extends continuously over the entire length in the circumferential direction. The end connecting portion 31b extends radially inward from the radially inner end of the end flange portion 31a toward the axially inner side. The end connecting portion 31b is connected to the outer end of the middle portion 26 in the axial direction. The end connecting portion 31b is arranged coaxially with the central axis O.

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。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における軸方向の外端は、端弾性体３１に接続されている。 The pair of medium elastic bodies 32 are formed to have the same shape and size. The medium elastic body 32 is formed entirely of a rubber material. The outer end of the middle elastic body 32 in the axial direction is connected to the end elastic body 31 .

内側取付部材１１の外周面に、各液室１４ａ、１４ｂに向けて突出したストッパ弾性部３４が各別に設けられている。なお、内側取付部材１１の外周面に、ストッパ弾性部３４を設けなくてもよい。ストッパ弾性部３４は、中部分２６に設けられている。ストッパ弾性部３４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の内面に当接可能となっている。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。ストッパ弾性部３４は、中弾性体３２と周方向に接続されている。ストッパ弾性部３４は、端連結部３１ｂと軸方向に接続されている。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。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。 Separate stopper elastic portions 34 are provided on the outer circumferential surface of the inner mounting member 11 and project toward the respective liquid chambers 14a and 14b. Note that it is not necessary to provide the stopper elastic portion 34 on the outer peripheral surface of the inner mounting member 11. The stopper elastic portion 34 is provided in the middle portion 26. The stopper elastic portion 34 can come into contact with the inner surface of the covering member 17, which will be described later, when the inner mounting member 11 and the outer cylinder 12 move relatively toward each other. The stopper elastic portion 34 is disposed between the medium elastic bodies 32 adjacent to each other in the circumferential direction, and constitutes a part of the partition wall of the liquid chambers 14a, 14b. The stopper elastic portion 34 is connected to the intermediate elastic body 32 in the circumferential direction. The stopper elastic portion 34 is connected to the end connecting portion 31b in the axial direction. The stopper elastic portion 34 and the elastic bodies 31 and 32 are integrally formed of, for example, a rubber material. The entire outer peripheral surface of the inner mounting member 11 is covered with, for example, a rubber material.

内側取付部材１１と外筒１２との間には、一対の端弾性体３１同士の間において、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部分を、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。液室１４ａ、１４ｂには、例えば水、およびエチレングリコール等が封入される。
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。被覆部材１７は、一対の端弾性体３１同士の間に、軸方向に挟まれて嵌合されている。 Between the inner mounting member 11 and the outer cylinder 12, a portion between the pair of end elastic bodies 31 and between middle elastic bodies 32 adjacent to each other in the circumferential direction is covered from the outside in the radial direction. A covering member 17 is disposed between the inner mounting member 11 and the liquid chambers 14a and 14b. For example, water, ethylene glycol, and the like are sealed in the liquid chambers 14a and 14b.
The covering member 17 is made of a material harder than the material forming the elastic bodies 31 and 32, such as a synthetic resin material. The covering member 17 is fitted between the pair of end elastic bodies 31 while being sandwiched in the axial direction.

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。 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 .

被覆部材１７の軸方向の両端部のうちのいずれか一方の端部、および端弾性体３１の端フランジ部３１ａは、外筒１２の軸方向の両端部のうちのいずれか一方の端部に形成された固定部２３によって軸方向に挟まれて固定されている。本実施形態では、被覆部材１７の前記一方の端部に、径方向の外側に向けて突出し、周方向に延びる固定フランジ部１７ｃが形成され、固定フランジ部１７ｃ、および剛体板３３が、固定部２３によって軸方向に挟まれて固定されている。固定フランジ部１７ｃと、剛体板３３における径方向の外端部と、がゴム膜を介して軸方向に積層されている。なお、被覆部材１７に固定フランジ部１７ｃを形成しなくてもよい。 One of the axial ends of the covering member 17 and the end flange 31a of the end elastic body 31 are connected to one of the axial ends of the outer cylinder 12. It is axially sandwiched and fixed by the formed fixing portions 23. In this embodiment, a fixed flange portion 17c that protrudes radially outward and extends in the circumferential direction is formed at the one end of the covering member 17, and the fixed flange portion 17c and the rigid plate 33 are connected to the fixed portion. 23 in the axial direction and fixed. The fixed flange portion 17c and the radially outer end portion of the rigid plate 33 are laminated in the axial direction with a rubber film interposed therebetween. Note that it is not necessary to form the fixed flange portion 17c on the covering member 17.

固定部２３は、径方向の外側に向けて窪み、周方向の全長にわたって連続して延びる周溝を有している。この周溝に、固定フランジ部１７ｃ、および端フランジ部３１ａが、剛体板３３とともに、周方向の全長にわたって嵌合されている。固定部２３は、外筒１２の前記一方の端部が、屈曲されて形成されるとともに、径方向の外側に向けて膨出している。 The fixing portion 23 has a circumferential groove that is recessed toward the outside in the radial direction and continuously extends over the entire length in the circumferential direction. The fixed flange portion 17c and the end flange portion 31a are fitted into this circumferential groove along with the rigid plate 33 over the entire length in the circumferential direction. The fixing portion 23 is formed by bending the one end of the outer cylinder 12, and bulges outward in the radial direction.

外筒１２の軸方向の両端部のうちのいずれか他方の端部に、径方向の内側に向けて突出し、被覆部材１７の軸方向の両端部のうちのいずれか他方の端部を、軸方向に支持する支持突部２４が形成されている。支持突部２４は、外筒１２の前記他方の端部が、屈曲されてフランジ状に形成されている。支持突部２４は、端弾性体３１の端フランジ部３１ａを介して、被覆部材１７の前記他方の端部を軸方向に支持している。 The outer tube 12 is provided with a radially inward protrusion at one of the two axial ends of the outer cylinder 12, and one of the two axial ends of the covering member 17 is attached to the shaft. A support protrusion 24 is formed to provide support in the direction. The support protrusion 24 is formed by bending the other end of the outer cylinder 12 into a flange shape. The support protrusion 24 supports the other end of the covering member 17 in the axial direction via the end flange 31a of the end elastic body 31.

以下、軸方向のうち、外筒１２の固定部２３が位置している側を上側といい、外筒１２の支持突部２４が位置している側を下側という。 Hereinafter, in the axial direction, the side on which the fixing part 23 of the outer cylinder 12 is located will be referred to as the upper side, and the side on which the support protrusion 24 of the outer cylinder 12 is located will be referred to as the lower side.

そして、本実施形態では、端弾性体３１と、被覆部材１７のうちの軸方向を向く端面と、の間に、各液室１４ａ、１４ｂ同士を連通するオリフィス通路が設けられている。
オリフィス通路は、被覆部材１７の上端面１７ａに設けられている。この上端面１７ａは、上方を向く平坦面となっている。なお、オリフィス通路は、被覆部材１７の下端面１７ｂに設けられてもよい。 In this embodiment, an orifice passage is provided between the end elastic body 31 and the end face of the covering member 17 facing in the axial direction, which communicates the liquid chambers 14a and 14b with each other.
The orifice passage is provided on the upper end surface 17a of the covering member 17. This upper end surface 17a is a flat surface facing upward. Note that the orifice passage may be provided on the lower end surface 17b of the covering member 17.

被覆部材１７の上端部には、周方向に延びる本体溝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。
本体溝１９は、被覆部材１７の上端面１７ａに形成され、第１連通開口１８および第２連通開口２０は、被覆部材１７の内面に開口している。本体溝１９の上端開口は、端弾性体３１の端フランジ部３１ａにより液密に閉塞されている。 The upper end portion of the covering member 17 includes a main body groove 19 extending in the circumferential direction, one of the liquid chambers 14a and 14b, and a first communication opening 18 that opens into the main body groove 19. A second communication opening 20 that opens into the other liquid chamber 14b of the liquid chambers 14a, 14b and the main body groove 19 is formed.
The main body groove 19 is formed on the upper end surface 17a of the covering member 17, and the first communication opening 18 and the second communication opening 20 are open on the inner surface of the covering member 17. The upper end opening of the main body groove 19 is fluid-tightly closed by the end flange portion 31a of the end elastic body 31.

被覆部材１７は、周方向に分割された複数の分割体１５を備えるとともに、周方向で互いに隣り合う分割体１５の周端縁１５ａ同士が互いに突き当てられて全体で円筒状をなしている。２つの分割体１５は、同等の形状で同等の大きさに形成されている。なお、被覆部材１７として、全体が筒状に一体に形成された構成を採用してもよい。
被覆部材１７は、中弾性体３２を全周にわたって覆っている。分割体１５の周端縁１５ａは、中弾性体３２における周方向の中央部に位置している。 The covering member 17 includes a plurality of divided bodies 15 divided in the circumferential direction, and the circumferential edges 15a of the divided bodies 15 that are adjacent to each other in the circumferential direction are abutted against each other, so that the whole has a cylindrical shape. The two divided bodies 15 are formed to have the same shape and the same size. Note that the covering member 17 may be formed integrally into a cylindrical shape as a whole.
The covering member 17 covers the entire circumference of the medium elastic body 32. The peripheral edge 15a of the divided body 15 is located at the center of the medium elastic body 32 in the circumferential direction.

外筒１２が、被覆部材１７に外嵌し、かつ固定部２３および支持突部２４が、端弾性体３１を介して被覆部材１７を軸方向に挟むことによって、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、端弾性体３１と被覆部材１７の上端面１７ａ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。
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。 The outer cylinder 12 fits onto the covering member 17, and the fixing part 23 and the supporting protrusion 24 sandwich the covering member 17 in the axial direction via the end elastic body 31, so that the outer cylinder 12 and the inner mounting member 11 are connected to each other. An orifice passage is defined between the end elastic body 31 and the upper end surface 17a of the covering member 17 to communicate the liquid chambers 14a, 14b with each other. 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.
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 change, causing the liquid in the liquid chambers 14a and 14b to change. flows through the orifice passage and causes liquid column resonance, thereby damping and absorbing vibrations.

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、各液室１４ａ、１４ｂ同士を連通するオリフィス通路が、端弾性体３１と、被覆部材１７の上端面１７ａと、の間に設けられているので、端弾性体３１を、外筒１２内に嵌合した状態で、被覆部材１７の上端面１７ａに押し当てることにより、オリフィス通路を流れる液体の密封性を確実に確保することができる。
これにより、オリフィス通路を流れる液体の密封性を確保するために、例えば被覆部材１７の寸法精度を高めたり、外筒１２等の他の部材にシール用のゴム膜を加硫接着したりする等の必要を無くすことが可能になり、製造コストを抑えることができる。 As explained above, according to the vibration isolator 1 according to the present embodiment, the orifice passage that communicates the liquid chambers 14a and 14b with each other is provided between the end elastic body 31 and the upper end surface 17a of the covering member 17. By pressing the end elastic body 31 against the upper end surface 17a of the covering member 17 while it is fitted in the outer cylinder 12, the sealing property of the liquid flowing through the orifice passage can be ensured. I can do it.
As a result, in order to ensure the sealing performance of the liquid flowing through the orifice passage, for example, the dimensional accuracy of the covering member 17 may be increased, or a rubber film for sealing may be vulcanized and bonded to other members such as the outer cylinder 12. This makes it possible to eliminate the need for , thereby reducing manufacturing costs.

次に、第２実施形態に係る防振装置２を、図３を参照しながら説明する。
なお、第２実施形態においては、第１実施形態における構成要素と同一の部分については同一の符号を付し、その説明を省略し、異なる点についてのみ説明する。 Next, a vibration isolator 2 according to a second embodiment will be described with reference to FIG. 3.
In the second embodiment, the same components as those in the first embodiment are given the same reference numerals, and the explanation thereof will be omitted, and only the different points will be explained.

本実施形態では、被覆部材１７が、軸方向に二分割された第１分割体２８および第２分割体２９を備えている。
第１分割体２８は、第２分割体２９の上方に設けられている。第１分割体２８は、被覆部材１７の上端面１７ａを有し、第２分割体２９は、被覆部材１７の下端面１７ｂを有している。第１分割体２８の軸方向の大きさは、第２分割体２９の軸方向の大きさより小さくなっている。第１分割体２８は、軸方向のほぼ全長にわたって端連結部３１ｂと径方向で対向している。 In this embodiment, the covering member 17 includes a first divided body 28 and a second divided body 29 that are divided into two in the axial direction.
The first divided body 28 is provided above the second divided body 29. The first divided body 28 has the upper end surface 17a of the covering member 17, and the second divided body 29 has the lower end surface 17b of the covering member 17. The axial size of the first divided body 28 is smaller than the axial size of the second divided body 29. The first divided body 28 faces the end connecting portion 31b in the radial direction over almost the entire length in the axial direction.

第１分割体２８に、第１実施形態と同様の本体溝１９および第１連通開口１８が形成されている。
第２分割体２９における軸方向の両端部のうち、第１分割体２８と軸方向に隣接する上端部に、周方向に延びる第２本体溝２９ａと、各液室１４ａ、１４ｂのうちのいずれか他方の液室１４ｂ、および第２本体溝２９ａに開口する第２連通開口２９ｃと、が形成されている。第２本体溝２９ａは、第２分割体２９のうち、第１分割体２８と軸方向に突き合わされた突き合わせ面（上端面）２９ｂに形成されている。
本体溝１９および第２本体溝２９ａは、第１分割体２８のうち、第２分割体２９と軸方向に突き合わされた突き合わせ面（下端面）２８ｂに形成された不図示の貫通孔を通して軸方向に連通している。
第１分割体２８および第２分割体２９それぞれの突き合わせ面２８ｂ、２９ｂは、軸方向を向く平坦面となっている。 A main body groove 19 and a first communication opening 18 similar to those in the first embodiment are formed in the first divided body 28 .
Of both ends of the second divided body 29 in the axial direction, an upper end adjacent to the first divided body 28 in the axial direction has a second main body groove 29a extending in the circumferential direction, and one of the liquid chambers 14a and 14b. The other liquid chamber 14b and a second communication opening 29c opening into the second main body groove 29a are formed. The second main body groove 29a is formed on an abutting surface (upper end surface) 29b of the second divided body 29 that abuts against the first divided body 28 in the axial direction.
The main body groove 19 and the second main body groove 29a are connected to each other in the axial direction through a through hole (not shown) formed in an abutting surface (lower end surface) 28b of the first divided body 28 that abuts against the second divided body 29 in the axial direction. is connected to.
The abutting surfaces 28b and 29b of the first divided body 28 and the second divided body 29 are flat surfaces facing 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２によれば、被覆部材１７が、軸方向に二分割された第１分割体２８および第２分割体２９を備え、オリフィス通路が、端弾性体３１と第１分割体２８の上端面１７ａとの間、並びに、互いに軸方向に突き合わされた、第１分割体２８および第２分割体２９それぞれの突き合わせ面２８ｂ、２９ｂの間に、一体に設けられているので、オリフィス通路を流れる液体の密封性を確実に確保しつつ、オリフィス通路の長さを容易に確保することができる。 As explained above, according to the vibration isolator 2 according to the present embodiment, the covering member 17 includes the first divided body 28 and the second divided body 29 that are divided into two in the axial direction, and the orifice passage has an end elasticity. Between the upper end surface 17a of the body 31 and the first divided body 28, and between the abutting surfaces 28b and 29b of the first divided body 28 and the second divided body 29, which are abutted against each other in the axial direction, Since this is provided, the length of the orifice passage can be easily secured while reliably ensuring the sealing performance of the liquid flowing through the orifice passage.

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。 Note that the technical scope of the present invention is not limited to the embodiments described above, and various changes can be made without departing from the spirit of the present invention.

端弾性体３１に剛体板３３を設けなくてもよく、外筒１２に固定部２３および支持突部２４を形成しなくてもよい。
第２実施形態において、第１分割体２８は、第２分割体２９より軟らかく弾性を有する、例えばエラストマー、およびゴム等の軟材質で形成されてもよい。 It is not necessary to provide the rigid plate 33 on the end elastic body 31, and it is not necessary to form the fixing part 23 and the supporting protrusion 24 on the outer cylinder 12.
In the second embodiment, the first divided body 28 may be made of a soft material that is softer and more elastic than the second divided body 29, such as an elastomer or rubber.

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、前記した実施形態および変形例を適宜組み合わせてもよい。 In addition, the components in the embodiments described above may be replaced with well-known components as appropriate without departing from the spirit of the present invention, and the embodiments and modifications described above may be combined as appropriate.

１、２ 防振装置
１１ 内側取付部材
１２ 外筒
１４ａ、１４ｂ 液室
１７ 被覆部材
１７ａ 上端面（端面）
２６ｃ 窪み部
２８ 第１分割体
２８ｂ、２９ｂ 突き合わせ面
２９ 第２分割体
３１ 端弾性体（弾性体）
３２ 中弾性体（弾性体）
Ｏ 中心軸線 1, 2 Vibration isolator 11 Inner mounting member 12 Outer tube 14a, 14b Liquid chamber 17 Covering member 17a Upper end surface (end surface)
26c Hollow portion 28 First divided body 28b, 29b Abutment surface 29 Second divided body 31 End elastic body (elastic body)
32 Medium elastic body (elastic body)
O center axis

Claims (2)

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、かつ前記被覆部材を前記軸方向に挟む一対の端弾性体を備え、
前記端弾性体と、前記被覆部材のうちの前記軸方向を向く端面と、の間に、各前記液室同士を連通するオリフィス通路が設けられている、防振装置。 an inner mounting member connected to either one of the vibration generating part and the vibration receiving part, 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;
The elastic body includes medium elastic bodies disposed separately on both sides sandwiching the inner mounting member in a radial direction intersecting the central axis when viewed in plan from an axial direction along the central axis of the outer cylinder. ,
Between the inner mounting member and the outer cylinder, the inner mounting member and the outer cylinder cover a space between the medium elastic bodies that are adjacent to each other in the circumferential direction surrounding the central axis in plan view from the outside in the radial direction. A covering member defining a liquid chamber is disposed between the
The elastic body includes a pair of end elastic bodies that are arranged at intervals in the axial direction, are fitted into the outer cylinder, and sandwich the covering member in the axial direction,
A vibration isolator, wherein an orifice passage that communicates the liquid chambers with each other is provided between the end elastic body and the end face of the covering member facing in the axial direction. 前記被覆部材は、前記軸方向に二分割された第１分割体および第２分割体を備え、
前記オリフィス通路は、前記端弾性体と前記第１分割体の端面との間、並びに、互いに前記軸方向に突き合わされた、前記第１分割体および前記第２分割体それぞれの突き合わせ面の間に、一体に設けられている、請求項１に記載の防振装置。 The covering member includes a first divided body and a second divided body divided into two in the axial direction,
The orifice passage is formed between the end elastic body and the end surface of the first divided body, and between the abutting surfaces of the first divided body and the second divided body that abut each other in the axial direction. The vibration isolator according to claim 1, wherein the vibration isolator is integrally provided.

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