JP4932610B2

JP4932610B2 - Vibration isolator

Info

Publication number: JP4932610B2
Application number: JP2007155457A
Authority: JP
Inventors: 哲植木
Original assignee: Bridgestone Corp
Current assignee: Bridgestone Corp
Priority date: 2007-06-12
Filing date: 2007-06-12
Publication date: 2012-05-16
Anticipated expiration: 2027-06-12
Also published as: JP2008309191A

Description

本発明は、例えば自動車や産業機械等に適用され、エンジン等の振動発生部の振動を吸収および減衰する防振装置に関するものである。 The present invention relates to a vibration isolator that is applied to, for example, automobiles and industrial machines and absorbs and attenuates vibrations of a vibration generating unit such as an engine.

この種の防振装置として、従来から、例えば下記特許文献１に示されるような、振動発生部および振動受部のいずれか一方に連結される第１取付け部と、振動発生部および振動受部のいずれか他方に連結される第２取付け部と、これらの第１、第２取付け部同士を弾性的に連結する第１ゴム弾性体と、この第１ゴム弾性体を隔壁の一部として液体が封入され、かつ第１ゴム弾性体の変形により内容積が変化する主液室と、隔壁の少なくとも一部が変形可能に形成され、かつ液体が封入される副液室と、主液室と副液室とを連通するオリフィスと、を備えた構成が知られている。ここで、第１取付け部は、内部に前記主液室および副液室を有する筒状の本体部を備え、この本体部の周壁部に、主液室に開口する側面開口部が形成されるとともに、この側面開口部を閉塞する板状の第２ゴム弾性体が張設されている。
以上より、第１取付け部若しくは第２取付け部に振動が作用したときに、第１、第２ゴム弾性体を弾性変形若しくは振動させる等することにより、振動を吸収および減衰できるようになっている。
特開平５−１０３７７号公報 As this type of vibration isolator, conventionally, for example, as shown in Patent Document 1 below, a first mounting portion connected to one of a vibration generating portion and a vibration receiving portion, a vibration generating portion, and a vibration receiving portion A second mounting portion connected to one of the other, a first rubber elastic body that elastically connects the first and second mounting portions, and a liquid using the first rubber elastic body as a part of the partition wall. A main liquid chamber in which the internal volume changes due to deformation of the first rubber elastic body, a sub-liquid chamber in which at least a part of the partition wall is deformably formed, and a liquid is enclosed, and a main liquid chamber, A configuration including an orifice communicating with the secondary liquid chamber is known. Here, the first attachment portion includes a cylindrical main body having the main liquid chamber and the sub liquid chamber therein, and a side opening that opens to the main liquid chamber is formed in the peripheral wall of the main body. At the same time, a plate-like second rubber elastic body for closing the side opening is stretched.
As described above, when vibration acts on the first mounting portion or the second mounting portion, the first and second rubber elastic bodies can be elastically deformed or vibrated to absorb and attenuate the vibration. .
JP-A-5-10377

ところで、前記従来の防振装置では、第２ゴム弾性体の外表面が外気と接触していたので、この第２ゴム弾性体がオゾン劣化し易く、防振装置の制振性能が早期に低下してしまうおそれがあった。
そこで、このような問題を解決するために、例えば、第２ゴム弾性体を第１ゴム弾性体とは異なる耐オゾン性に優れたゴム材料で形成したり、あるいはその厚さを厚くしたりすることが考えられる。
しかしながら、前者では防振装置の高コスト化を招き、後者では第２ゴム弾性体の剛性が高くなって防振装置の制振性能が制限されるおそれがあった。 By the way, in the conventional vibration isolator, since the outer surface of the second rubber elastic body is in contact with the outside air, the second rubber elastic body is easily deteriorated by ozone, and the vibration damping performance of the vibration isolator is lowered early. There was a risk of doing so.
Therefore, in order to solve such a problem, for example, the second rubber elastic body is formed of a rubber material excellent in ozone resistance different from the first rubber elastic body, or the thickness thereof is increased. It is possible.
However, the former increases the cost of the vibration isolator, and the latter increases the rigidity of the second rubber elastic body, which may limit the vibration damping performance of the vibration isolator.

この発明は、このような事情を考慮してなされたもので、高コスト化を招いたり、制振性能を制限させたりすることなく、長寿命化を図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 view of such circumstances, and provides a vibration isolator capable of extending the life without incurring an increase in cost or limiting the vibration damping performance. With the goal.

上記課題を解決して、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いずれか一方に連結される第１取付け部と、振動発生部および振動受部のいずれか他方に連結される第２取付け部と、これらの第１、第２取付け部同士を弾性的に連結する第１ゴム弾性体と、この第１ゴム弾性体を隔壁の一部として液体が封入され、かつ第１ゴム弾性体の変形により内容積が変化する主液室と、隔壁の少なくとも一部が変形可能に形成され、かつ液体が封入される副液室と、主液室と副液室とを連通するオリフィスと、を備えた防振装置であって、前記第１取付け部は、内部に前記主液室および副液室を有する筒状の本体部と、この本体部を径方向外方から囲繞する外郭筒部と、を備え、前記本体部の周壁部には、前記主液室に開口する側面開口部が形成されるとともに、この側面開口部を閉塞する板状の第２ゴム弾性体が、前記外郭筒部の外部に対して気密に保たれた状態で張設され、この第２ゴム弾性体の少なくとも一部は前記外郭筒部の内周面と非接触となっていて、前記本体部の外周面において前記側面開口部の開口周縁部には、前記外郭筒部の内周面に気密状態で当接した囲繞ゴム弾性体が設けられ、前記第２ゴム弾性体は、少なくとも前記囲繞ゴム弾性体によって前記外郭筒部の外部に対して気密に保たれていて、前記囲繞ゴム弾性体においてこの防振装置の中心軸線方向における一端部に、この中心軸線方向に開口するシール開口部が形成され、かつこの囲繞ゴム弾性体の両周端部には、前記本体部の外周面に沿ってその周方向に連続して延在したバンドゴム弾性体が連結され、このバンドゴム弾性体および前記囲繞ゴム弾性体が外郭筒部の内周面に気密状態で当接し、かつ前記本体部および外郭筒部それぞれにおける前記中心軸線方向の一端部同士が気密状態で嵌合することによって、前記第２ゴム弾性体が、前記外郭筒部の外部に対して気密に保たれていることを特徴とする。
また、本発明の防振装置は、振動発生部および振動受部のいずれか一方に連結される第１取付け部と、振動発生部および振動受部のいずれか他方に連結される第２取付け部と、これらの第１、第２取付け部同士を弾性的に連結する第１ゴム弾性体と、この第１ゴム弾性体を隔壁の一部として液体が封入され、かつ第１ゴム弾性体の変形により内容積が変化する主液室と、隔壁の少なくとも一部が変形可能に形成され、かつ液体が封入される副液室と、主液室と副液室とを連通するオリフィスと、を備えた防振装置であって、前記第１取付け部は、内部に前記主液室および副液室を有する筒状の本体部と、この本体部を径方向外方から囲繞する外郭筒部と、を備え、前記本体部の周壁部には、前記主液室に開口する側面開口部が形成されるとともに、この側面開口部を閉塞する板状の第２ゴム弾性体が、前記外郭筒部の外部に対して気密に保たれた状態で張設され、この第２ゴム弾性体の少なくとも一部は前記外郭筒部の内周面と非接触となっていて、前記本体部の外周面において前記側面開口部の開口周縁部には、前記外郭筒部の内周面に気密状態で当接した囲繞ゴム弾性体が設けられ、前記第２ゴム弾性体は、少なくとも前記囲繞ゴム弾性体によって前記外郭筒部の外部に対して気密に保たれていて、前記囲繞ゴム弾性体においてこの防振装置の中心軸線方向における両端部にはそれぞれ、前記本体部の外周面に沿ってその周方向に連続して延在したバンドゴム弾性体が連結され、かつこの囲繞ゴム弾性体の周端部には、前記本体部の周方向に開口するシール開口部が形成され、前記バンドゴム弾性体および囲繞ゴム弾性体が前記外郭筒部の内周面に気密状態で当接することによって、前記第２ゴム弾性体は、前記外郭筒部の外部に対して気密に保たれていることを特徴とする。
この発明では、第２ゴム弾性体が外郭筒部の外部に対して気密に保たれているので、この第２ゴム弾性体が外気に接触してオゾン劣化し易くなるのを防ぐことが可能になる。したがって、例えば、第２ゴム弾性体を第１ゴム弾性体とは異なる耐オゾン性に優れたゴム材料で形成したり、その厚さを厚くしたりすることなく、この防振装置の長寿命化を図ることができる。
しかも、第２ゴム弾性体の少なくとも一部が外郭筒部の内周面と非接触となっているので、第１取付け部若しくは第２取付け部に振動が作用した際に生ずる第２ゴム弾性体の弾性変形若しくは振動が、外郭筒部の内周面によって阻害されるのを抑えることが可能になり、防振装置の制振性能が制限されるのを防ぐことができる。
また、第２ゴム弾性体を外郭筒部の外部に対して確実に気密に保つことが可能になる。
さらに、第２ゴム弾性体は、囲繞ゴム弾性体によりその全周にわたって囲繞されているのではなく、少なくとも一部が、前記シール開口部を通して、本体部と外郭筒部との間の、バンドゴム弾性体を隔壁の一部とする気密空間内に開放されているので、囲繞ゴム弾性体を設けたことによって、第２ゴム弾性体の変形や振動が抑えられ防振装置の制振性能が制限されるのを防ぐことが可能になる。 In order to solve the above-described problems and achieve such an object, the vibration isolator of the present invention includes a first attachment portion coupled to one of a vibration generating portion and a vibration receiving portion, a vibration generating portion, A second mounting portion connected to one of the vibration receiving portions, a first rubber elastic body that elastically connects the first and second mounting portions, and the first rubber elastic body are connected to a partition wall. A main liquid chamber in which liquid is sealed as a part and the internal volume changes due to deformation of the first rubber elastic body, a sub liquid chamber in which at least a part of the partition wall is deformably formed and liquid is sealed, An anti-vibration device comprising an orifice communicating with the liquid chamber and the sub liquid chamber, wherein the first mounting portion includes a cylindrical main body portion having the main liquid chamber and the sub liquid chamber therein; An outer tube portion that surrounds the main body portion from the outside in the radial direction, and a peripheral wall portion of the main body portion, A side opening that opens in the main liquid chamber is formed, and a plate-like second rubber elastic body that closes the side opening is stretched in a state of being kept airtight against the outside of the outer cylinder. And at least a part of the second rubber elastic body is not in contact with the inner peripheral surface of the outer cylindrical portion, and the outer peripheral surface of the main body portion has the outer peripheral portion at the opening peripheral portion of the side opening. A surrounding rubber elastic body that is in airtight contact with the inner peripheral surface of the cylindrical portion is provided, and the second rubber elastic body is kept airtight with respect to the outside of the outer cylindrical portion by at least the surrounding rubber elastic body. In the surrounding rubber elastic body, a seal opening opening in the central axis direction is formed at one end portion in the central axis direction of the vibration isolator, and both peripheral ends of the surrounding rubber elastic body Continuing in the circumferential direction along the outer peripheral surface of the main body The band rubber elastic body is connected, and the band rubber elastic body and the surrounding rubber elastic body abut on the inner peripheral surface of the outer tube portion in an airtight state, and the central axis direction in each of the main body portion and the outer tube portion The second rubber elastic body is kept airtight with respect to the outside of the outer cylinder portion by fitting one end portions of the outer rubber portion in an airtight state.
In addition, the vibration isolator of the present invention includes a first attachment portion connected to one of the vibration generating portion and the vibration receiving portion, and a second attachment portion connected to one of the vibration generating portion and the vibration receiving portion. And a first rubber elastic body that elastically connects the first and second mounting portions, a liquid is sealed with the first rubber elastic body as a part of the partition, and the first rubber elastic body is deformed. A main liquid chamber whose inner volume changes, a sub-liquid chamber in which at least a part of the partition wall is deformably formed and a liquid is enclosed, and an orifice communicating the main liquid chamber and the sub-liquid chamber. The first mounting portion includes a cylindrical main body having the main liquid chamber and the sub liquid chamber therein, and an outer cylinder that surrounds the main body from the outside in the radial direction, A side opening that opens into the main liquid chamber is formed in the peripheral wall of the main body. In addition, a plate-like second rubber elastic body that closes the side opening is stretched in an airtight state with respect to the outside of the outer tube portion, and at least a part of the second rubber elastic body is An enclosure that is in non-contact with the inner peripheral surface of the outer cylinder portion, and that is in airtight contact with the inner peripheral surface of the outer cylinder portion at the opening peripheral edge of the side opening on the outer peripheral surface of the main body portion. A rubber elastic body is provided, and the second rubber elastic body is kept airtight at least with respect to the outside of the outer cylindrical portion by the surrounding rubber elastic body. In the surrounding rubber elastic body, the center of the vibration isolator is provided. A band rubber elastic body continuously extending in the circumferential direction along the outer peripheral surface of the main body portion is connected to both end portions in the axial direction, and the peripheral end portion of the surrounding rubber elastic body A seal opening that opens in the circumferential direction of the main body is formed, The second rubber elastic body is kept airtight with respect to the outside of the outer cylindrical portion by the band rubber elastic body and the surrounding rubber elastic body being in contact with the inner peripheral surface of the outer cylindrical portion in an airtight state. It is characterized by being.
In this invention, since the second rubber elastic body is kept airtight with respect to the outside of the outer cylinder portion, it is possible to prevent the second rubber elastic body from coming into contact with the outside air and being easily deteriorated by ozone. Become. Therefore, for example, it is possible to extend the life of the vibration isolator without forming the second rubber elastic body from a rubber material excellent in ozone resistance different from that of the first rubber elastic body or increasing its thickness. Can be achieved.
Moreover, since at least a part of the second rubber elastic body is not in contact with the inner peripheral surface of the outer cylinder portion, the second rubber elastic body generated when vibration acts on the first mounting portion or the second mounting portion. It is possible to suppress the elastic deformation or vibration of the outer shell from being hindered by the inner peripheral surface of the outer cylinder portion, and it is possible to prevent the vibration damping performance of the vibration isolator from being limited.
In addition, the second rubber elastic body can be reliably kept airtight with respect to the outside of the outer cylindrical portion.
Furthermore, the second rubber elastic body is not surrounded by the surrounding rubber elastic body over the entire circumference, but at least a part of the second rubber elastic body passes through the seal opening and is between the main body portion and the outer cylinder portion. Since it is opened in an airtight space with the elastic body as a part of the partition wall, by providing the surrounding rubber elastic body, deformation and vibration of the second rubber elastic body can be suppressed and the vibration damping performance of the vibration isolator is limited. Can be prevented.

ここで、前記第１ゴム弾性体は前記本体部の内周面に接着されるとともに、この第１ゴム弾性体および前記第２ゴム弾性体は同じゴム材料で一体に形成されてもよい。
この場合、第１ゴム弾性体および第２ゴム弾性体が同じゴム材料で一体に形成されているので、これらの各部材を高精度かつ容易に形成することが可能になり、前述の作用効果が確実に奏功されるとともに、この防振装置の高コスト化を抑えることができる。 Here, the first rubber elastic body may be bonded to the inner peripheral surface of the main body, and the first rubber elastic body and the second rubber elastic body may be integrally formed of the same rubber material.
In this case, since the first rubber elastic body and the second rubber elastic body are integrally formed of the same rubber material, it becomes possible to form these members with high precision and ease, and the above-described effects are obtained. While being surely successful, the cost of the vibration isolator can be suppressed.

また、前記本体部の内部においてオリフィスの一部を含む空間内に往復動可能に設けられ、かつこの往復動で前記オリフィスを開閉する開閉部材と、前記主液室と開閉部材との間に配置され、かつ前記主液室から開閉部材側へのみ液体を流動させる逆止弁と、前記開閉部材を逆止弁側に向けて付勢する弾性部材と、が備えられ、この防振装置に振動が加わるのに伴って生じる第１ゴム弾性体の変形によって、前記主液室が拡縮してその内容積が変化するとともに、この主液室の内容積の変化に伴って生じる液圧変動により前記開閉部材が往復動して、前記オリフィスを開閉させる構成とされてもよい。 An opening / closing member provided inside the main body portion so as to be capable of reciprocating in a space including a part of the orifice and opening / closing the orifice by the reciprocating motion, and disposed between the main liquid chamber and the opening / closing member. And a check valve that allows liquid to flow only from the main liquid chamber to the opening / closing member side, and an elastic member that urges the opening / closing member toward the check valve side. Due to the deformation of the first rubber elastic body that occurs as the pressure increases, the main liquid chamber expands and contracts to change its internal volume, and the fluid pressure fluctuation that occurs with the change in the internal volume of the main liquid chamber causes the above-mentioned The opening / closing member may reciprocate to open and close the orifice.

この発明によれば、防振装置の高コスト化を招いたり、制振性能を制限させたりすることなく、長寿命化を図ることができる。 According to the present invention, it is possible to extend the service life of the vibration isolator without increasing the cost or limiting the vibration control performance.

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。この防振装置１０は、振動発生部および振動受部のいずれか一方に連結される第１取付け部１１と、振動発生部および振動受部のいずれか他方に連結される第２取付け部１２と、これらの第１、第２取付け部１１、１２同士を弾性的に連結するブロック状の第１ゴム弾性体１３と、この第１ゴム弾性体１３を隔壁の一部として液体が封入され、かつ第１ゴム弾性体１３の変形により内容積が変化する主液室１４と、隔壁の少なくとも一部が変形可能に形成され、かつ液体が封入される副液室１５と、主液室１４と副液室１５とを連通するオリフィス１６、２７と、を備えている。
なお、これらの各部材はそれぞれ、中心軸線Ｏと同軸に設けられている。また、前記液体としては、例えばエチレングリコール、水、シリコーンオイル等が挙げられる。 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 10 includes a first attachment portion 11 connected to one of the vibration generating portion and the vibration receiving portion, and a second attachment portion 12 connected to either the vibration generating portion and the vibration receiving portion. A first rubber elastic body 13 in a block shape that elastically connects the first and second mounting portions 11 and 12, and a liquid is sealed with the first rubber elastic body 13 as a part of a partition wall; and The main liquid chamber 14 whose internal volume changes due to the deformation of the first rubber elastic body 13, the sub liquid chamber 15 in which at least a part of the partition wall is deformably formed and the liquid is enclosed, the main liquid chamber 14 and the sub liquid chamber And orifices 16 and 27 communicating with the liquid chamber 15.
Each of these members is provided coaxially with the central axis O. Examples of the liquid include ethylene glycol, water, and silicone oil.

第１取付け部１１は、内部に主液室１４および副液室１５を有する筒状の本体部１７と、この本体部１７を径方向外方から囲繞する外郭筒部１８と、を備えている。なお、図示の例では、外郭筒部１８の一端開口部に、取付け板１８ａがその径方向外方に向けて突設されており、この取付け板１８ａが車両に取り付けられるようになっている。 The first mounting portion 11 includes a cylindrical main body portion 17 having a main liquid chamber 14 and a sub liquid chamber 15 therein, and an outer cylindrical portion 18 that surrounds the main body portion 17 from the outside in the radial direction. . In the illustrated example, a mounting plate 18a projects from the one end opening of the outer cylinder 18 toward the outside in the radial direction, and the mounting plate 18a is attached to the vehicle.

ここで、本実施形態では、第１ゴム弾性体１３は、本体部１７の一端開口部を閉塞するように設けられている。図示の例では、第１ゴム弾性体１３は、本体部１７の内周面における一端開口部に接着されている。さらに、この本体部１７には、その他端開口部を閉塞するようにダイヤフラム１９が設けられており、この本体部１７の内部は、第１ゴム弾性体１３およびダイヤフラム１９で閉塞されている。このうちダイヤフラム１９は、副液室１５の隔壁の一部となっている。 Here, in this embodiment, the 1st rubber elastic body 13 is provided so that the one end opening part of the main-body part 17 may be obstruct | occluded. In the illustrated example, the first rubber elastic body 13 is bonded to one end opening on the inner peripheral surface of the main body portion 17. Further, the main body portion 17 is provided with a diaphragm 19 so as to close the other end opening, and the inside of the main body portion 17 is closed with the first rubber elastic body 13 and the diaphragm 19. Among these, the diaphragm 19 is a part of the partition wall of the auxiliary liquid chamber 15.

本体部１７の内側に、前記中心軸線Ｏ方向に間隔をあけて配置された一対の仕切り板２２ａ、２２ｂが嵌合されている。一対の仕切り板２２ａ、２２ｂ同士の間には、例えばゴム材若しくは合成樹脂材等からなる円板状の弁体２３が設けられている。弁体２３において、主液室１４側の表面はその外周縁部から径方向内方に向かうに従い漸次深くなるように凹み、副液室１５側の裏面はその外周縁部から径方向内方に向かうに従い漸次厚さが厚くなるように傾斜している。そして、弁体２３は、その表面の全体が一対の仕切り板２２ａ、２２ｂのうち主液室１４側に配置された上仕切り板２２ａの表面に押し付けられて平面とされ、かつ裏面の径方向中央部が一対の仕切り板２２ａ、２２ｂのうち副液室１５側に配置された下仕切り板２２ｂの表面に押し付けられて、一対の仕切り板２２ａ、２２ｂ同士の間に配置されている。 A pair of partition plates 22 a and 22 b arranged with a space in the direction of the central axis O are fitted inside the main body portion 17. A disc-shaped valve body 23 made of, for example, a rubber material or a synthetic resin material is provided between the pair of partition plates 22a and 22b. In the valve body 23, the surface on the main liquid chamber 14 side is recessed so as to gradually become deeper inward in the radial direction from the outer peripheral edge portion, and the back surface on the sub liquid chamber 15 side is radially inward from the outer peripheral edge portion. It is inclined so that the thickness gradually increases as it goes. The entire surface of the valve body 23 is pressed against the surface of the upper partition plate 22a disposed on the main liquid chamber 14 side of the pair of partition plates 22a and 22b, and the center of the rear surface in the radial direction. The portion is pressed against the surface of the lower partition plate 22b disposed on the sub liquid chamber 15 side of the pair of partition plates 22a and 22b, and is disposed between the pair of partition plates 22a and 22b.

上仕切り板２２ａの表面において弁体２３が当接した部分には、その外周縁よりも径方向内方に、複数の貫通孔が形成されている。また、下仕切り板２２ｂの表面において弁体２３と対向する部分には、その外周縁を跨って複数の貫通孔が形成されている。 A plurality of through-holes are formed on the surface of the upper partition plate 22a in contact with the valve body 23, radially inward from the outer peripheral edge thereof. Moreover, a plurality of through holes are formed across the outer peripheral edge of the surface of the lower partition plate 22b facing the valve element 23.

以上より、主液室１４内の液圧が大きくなりこの液圧が弁体２３の表面側から作用すると、この弁体２３の外周部が副液室１５側に弾性状態で折り曲げられ、上仕切り板２２ａに形成された貫通孔が開口し、この貫通孔と下仕切り板２２ｂに形成された貫通孔とが、仕切り板２２ａ、２２ｂ同士の間の空間を通して連通する。
一方、液圧が弁体２３の裏面側から作用すると、この弁体２３の表面が上仕切り板２２ａにさらに押し付けられる。
すなわち、弁体２３および仕切り板２２ａ、２２ｂにより、主液室１４から後述する開閉部材２５側へのみ液体を流動させ、開閉部材２５側から主液室１４への液体の流動を規制する逆止弁２４が構成されている。 As described above, when the hydraulic pressure in the main liquid chamber 14 increases and this hydraulic pressure acts from the surface side of the valve body 23, the outer peripheral portion of the valve body 23 is bent in an elastic state toward the sub liquid chamber 15 side, and the upper partition A through hole formed in the plate 22a opens, and the through hole and the through hole formed in the lower partition plate 22b communicate with each other through a space between the partition plates 22a and 22b.
On the other hand, when the hydraulic pressure acts from the back side of the valve body 23, the surface of the valve body 23 is further pressed against the upper partition plate 22a.
In other words, the valve body 23 and the partition plates 22a and 22b allow the liquid to flow only from the main liquid chamber 14 to the opening / closing member 25 side described later, and to prevent the liquid flow from the opening / closing member 25 side to the main liquid chamber 14. A valve 24 is configured.

ここで、オリフィス１６、２７を有するオリフィス形成部材２６は筒状とされて、本体部１７の内側において、下仕切り部２２ｂとダイヤフラム１９との間に位置する部分に嵌合している。このオリフィス形成部材２６には、その内部を前記中心軸線Ｏ方向で仕切り、かつ副液室１５の隔壁の一部を構成する壁部２６ａが設けられている。この壁部２６ａと、オリフィス形成部材２６の内周面において壁部２６ａよりもダイヤフラム１９側に位置する部分と、が副液室１５の隔壁の一部をなしている。 Here, the orifice forming member 26 having the orifices 16 and 27 has a cylindrical shape, and is fitted to a portion located between the lower partition portion 22 b and the diaphragm 19 inside the main body portion 17. The orifice forming member 26 is provided with a wall portion 26 a that divides the inside thereof in the direction of the central axis O and constitutes a part of the partition wall of the auxiliary liquid chamber 15. The wall portion 26 a and a portion located on the diaphragm 19 side of the wall portion 26 a on the inner peripheral surface of the orifice forming member 26 form a part of the partition wall of the sub liquid chamber 15.

さらに、オリフィス形成部材２６の内側において、壁部２６ａと下仕切り板２２ｂとの間に位置する部分には、筒状の開閉部材２５が前記中心軸線Ｏ方向に摺動可能に設けられている。この開閉部材２５の前記中心軸線Ｏ方向における下仕切り部２２ｂ側の端部には、その径方向に延びる頂板２５ａが連結されている。そして、開閉部材２５が前記中心軸線Ｏ方向に移動したときに、この頂板２５ａが下仕切り板２２ｂに接触および離間してこの下仕切り板２２ｂに形成された貫通孔を開閉するようになっている。 Further, a cylindrical opening / closing member 25 is slidably provided in the direction of the central axis O at a portion located between the wall portion 26a and the lower partition plate 22b inside the orifice forming member 26. A top plate 25a extending in the radial direction is connected to an end of the opening / closing member 25 on the lower partition 22b side in the central axis O direction. When the opening / closing member 25 moves in the direction of the central axis O, the top plate 25a contacts and separates from the lower partition plate 22b to open and close the through hole formed in the lower partition plate 22b. .

ここで、開閉部材２５が摺動するオリフィス形成部材２６の内周面において壁部２６ａ側の端部には、２つのオリフィス１６、２７のうちのアイドルオリフィス１６に連通する図示されない連通孔が形成されており、開閉部材２５は、前記中心軸線Ｏ方向に移動したときにこの連通孔をも開閉し、アイドルオリフィス１６を介して主液室１４と副液室１６とを連通および遮断するようになっている。
また、開閉部材２５の頂板２５ａとオリフィス形成部材２６の壁部２６ａとの間には、開閉部材２５を下仕切り部２２ｂ（逆止弁２４）側に向けて付勢する例えばコイルスプリング等の弾性部材３５が設けられている。 Here, on the inner peripheral surface of the orifice forming member 26 on which the opening / closing member 25 slides, a communication hole (not shown) that communicates with the idle orifice 16 of the two orifices 16 and 27 is formed at the end on the wall 26a side. The opening / closing member 25 also opens and closes this communication hole when moved in the direction of the central axis O, and communicates and blocks the main liquid chamber 14 and the sub liquid chamber 16 via the idle orifice 16. It has become.
Further, between the top plate 25a of the opening / closing member 25 and the wall portion 26a of the orifice forming member 26, the opening / closing member 25 is urged toward the lower partition portion 22b (check valve 24), for example, an elastic such as a coil spring. A member 35 is provided.

そして、この防振装置１０に振動が加わるのに伴って生じる第１ゴム弾性体１３の変形によって、主液室１４が拡縮してその内容積が変化するとともに、この主液室１４の内容積の変化に伴って生じる液圧変動により開閉部材２５が前述のように前記中心軸線Ｏ方向に往復動して、前記連通孔を開閉させ、アイドルオリフィス１６を介して主液室１４と副液室１５とを連通および遮断できるようになっている。
なお、２つのオリフィス１６、２７のうちのシェイクオリフィス２７は、液圧変動によらず常時、主液室１４と副液室１５とを連通させている。 The main liquid chamber 14 expands and contracts due to deformation of the first rubber elastic body 13 that occurs as vibration is applied to the vibration isolator 10, and the internal volume of the main liquid chamber 14 changes. As described above, the opening / closing member 25 reciprocates in the direction of the central axis O due to the fluid pressure fluctuation caused by the change in the pressure, opens and closes the communication hole, and the main liquid chamber 14 and the auxiliary liquid chamber via the idle orifice 16. 15 can be communicated and blocked.
The shake orifice 27 of the two orifices 16 and 27 always communicates the main liquid chamber 14 and the sub liquid chamber 15 regardless of the fluid pressure fluctuation.

以上より、防振装置１０にアイドル振動が加わった場合には、主液室１４の液圧変動により生ずる力よりも、開閉部材２５を逆止弁２４に向けて付勢する弾性部材３５の予圧縮荷重の方が大きいため、開閉部材２５の頂板２５ａは下仕切り板２２ｂと当接して、この下仕切り板２２ｂに形成された貫通孔が閉じられ、かつ主液室１４と副液室１５とが前記連通孔およびアイドルオリフィス１６を介して連通し、液体が往来することにより、この液体がアイドルオリフィス１６内で液柱共振等して防振装置１０の動ばね定数が低減され、アイドル振動が吸収されるようになっている。なお、この際、主液室１４と副液室１５とはシェイクオリフィス２７をも通して連通しており、振動は液体がこのオリフィス２７も往来することにより吸収されるようになっている。 As described above, when idle vibration is applied to the vibration isolator 10, the elastic member 35 that biases the opening / closing member 25 toward the check valve 24 rather than the force generated by the fluid pressure fluctuation in the main fluid chamber 14 is preliminarily determined. Since the compressive load is larger, the top plate 25a of the opening / closing member 25 contacts the lower partition plate 22b, the through-hole formed in the lower partition plate 22b is closed, and the main liquid chamber 14 and the sub liquid chamber 15 Are communicated through the communication hole and the idle orifice 16, and the liquid comes and goes, so that the liquid resonates in the idle orifice 16 and the dynamic spring constant of the vibration isolator 10 is reduced. It is designed to be absorbed. At this time, the main liquid chamber 14 and the sub liquid chamber 15 communicate with each other through the shake orifice 27, and the vibration is absorbed when the liquid also travels through the orifice 27.

一方、この防振装置１０にシェイク振動が加わった場合には、主液室１４の液圧変動により生ずる力が、前記予圧縮荷重よりも大きくなるため、弁体２３が前述のように折り曲げられ、液体が主液室１４から流出する。そして、この液体に押された開閉部材２５が、弾性部材３５の付勢力に抗しつつ副液室１５側に移動させられ、オリフィス形成部材２６の壁部２６ａに当接する。これにより、前記連通孔が閉じられてアイドルオリフィス１６を通した主液室１４と副液室１５との連通が遮断され、シェイクオリフィス２７のみを通して主液室１４と副液室１５とが連通する。これにより、このシェイクオリフィス２７内を液体が往来して液柱共振等することにより、シェイク振動が吸収されるようになっている。 On the other hand, when shake vibration is applied to the vibration isolator 10, the force generated by the fluid pressure fluctuation in the main fluid chamber 14 becomes larger than the precompression load, so that the valve body 23 is bent as described above. The liquid flows out from the main liquid chamber 14. Then, the opening / closing member 25 pushed by the liquid is moved to the sub liquid chamber 15 side against the urging force of the elastic member 35 and comes into contact with the wall portion 26 a of the orifice forming member 26. As a result, the communication hole is closed, the communication between the main liquid chamber 14 and the sub liquid chamber 15 through the idle orifice 16 is blocked, and the main liquid chamber 14 and the sub liquid chamber 15 communicate with each other only through the shake orifice 27. . Thus, the shake vibration is absorbed by the liquid coming and going through the shake orifice 27 and liquid column resonance or the like.

そして、本実施形態では、本体部１７の周壁部に、主液室１４に開口する側面開口部２８が形成されるとともに、この側面開口部２８を閉塞する板状の第２ゴム弾性体２９が、外郭筒部１８の内周面と非接触とされて張設されている。図示の例では、側面開口部２８は、この本体部１７の周壁部の側面視四角形状とされている。なお、第２ゴム弾性体２９は、ダイヤフラム１９の厚さ以上の厚さで形成されており、防振装置１０に振動が加わったときに、本体部１７の径方向に弾性変形若しくは振動することにより、振動を吸収するようになっている。また、第２ゴム弾性体２９は、その外表面が本体部１７の内周面と面一となるように設けられている。さらに、第２ゴム弾性体２９は、平板状体とされその全体が外郭筒部１８の内周面と非接触となっている。 In the present embodiment, the side wall opening 28 that opens to the main liquid chamber 14 is formed in the peripheral wall portion of the main body portion 17, and the plate-like second rubber elastic body 29 that closes the side surface opening 28 is formed. The outer cylindrical portion 18 is stretched out of contact with the inner peripheral surface. In the illustrated example, the side opening 28 has a rectangular shape in a side view of the peripheral wall portion of the main body 17. The second rubber elastic body 29 is formed with a thickness equal to or greater than the thickness of the diaphragm 19 and elastically deforms or vibrates in the radial direction of the main body portion 17 when vibration is applied to the vibration isolator 10. Therefore, vibration is absorbed. The second rubber elastic body 29 is provided so that the outer surface thereof is flush with the inner peripheral surface of the main body portion 17. Further, the second rubber elastic body 29 is a flat body, and the whole is not in contact with the inner peripheral surface of the outer cylindrical portion 18.

また、本体部１７の外周面において側面開口部２８の開口周縁部には、外郭筒部１８の内周面に気密状態で当接した囲繞ゴム弾性体３０が設けられている。本実施形態では、この囲繞ゴム弾性体３０は、本体部１７の外周面に接着している。また、囲繞ゴム弾性体３０において、この防振装置１０の中心軸線Ｏ方向における一端部に、この中心軸線Ｏ方向に開口するシール開口部３１が形成されている。すなわち、シール開口部３１は、囲繞ゴム弾性体３０の前記一端部を前記中心軸線Ｏ方向に貫通している。 Further, on the outer peripheral surface of the main body portion 17, a surrounding rubber elastic body 30 that is in airtight contact with the inner peripheral surface of the outer tube portion 18 is provided at the opening peripheral portion of the side opening 28. In this embodiment, the go rubber elastic body 30 is bonded to the outer peripheral surface of the main body portion 17. Further, in the surrounding rubber elastic body 30, a seal opening 31 that opens in the direction of the central axis O is formed at one end in the direction of the central axis O of the vibration isolator 10. That is, the seal opening 31 penetrates the one end of the surrounding rubber elastic body 30 in the direction of the central axis O.

本実施形態では、囲繞ゴム弾性体３０は、側面開口部２８を画成する４辺上に沿って連続して設けられた４つの辺部により構成されており、これらの辺部のうち、前記中心軸線Ｏ方向の一端部に位置し、かつ本体部１７の周方向に沿って延びる上辺部を、その厚さが薄くなるように形成することによって、シール開口部３１が構成されている。以上より、囲繞ゴム弾性体３０を構成する前記４つの辺部のうち、前記上辺部以外の３つ辺部が外郭筒部１８の内周面に気密状態で当接し、シール開口部３１を有する前記上辺部は、外郭筒部１８の内周面に非接触となっている。 In the present embodiment, the go rubber elastic body 30 is composed of four sides continuously provided along the four sides defining the side opening 28, and among these sides, the side The seal opening portion 31 is configured by forming an upper side portion that is located at one end portion in the direction of the central axis O and that extends along the circumferential direction of the main body portion 17 so that the thickness thereof is reduced. As described above, of the four sides constituting the go rubber elastic body 30, three sides other than the upper side abut against the inner peripheral surface of the outer cylindrical portion 18 in an airtight state and have the seal opening 31. The upper side portion is not in contact with the inner peripheral surface of the outer cylindrical portion 18.

さらに、この囲繞ゴム弾性体３０の周端部、すなわち本実施形態では、前記４つの辺部のうち、本体部１７の周方向で互いに対向して配置され、かつ前記中心軸線Ｏ方向に沿って延びる２つの辺部にはそれぞれ、前記周方向においてこれらの辺部が互いに対向する方向の反対方向に向けて連続して延在し、これらの２つの辺部を前記反対方向側から連結するバンドゴム弾性体３２が設けられている。すなわち、バンドゴム弾性体３２は、本体部１７の外周面において囲繞ゴム弾性体３０が設けられている周方向位置を除いた部分の全周にわたって接着されている。
なお、図示の例では、バンドゴム弾性体３２は、前記２つの辺部それぞれの前記中心軸線Ｏ方向の中央部同士を連結している。 Further, the peripheral end portion of the surrounding rubber elastic body 30, that is, in the present embodiment, among the four side portions, they are arranged to face each other in the circumferential direction of the main body portion 17, and along the central axis O direction. Each of the two extending side portions continuously extends in a direction opposite to the direction in which the side portions face each other in the circumferential direction, and a band that connects the two side portions from the opposite direction side. A rubber elastic body 32 is provided. In other words, the band rubber elastic body 32 is bonded to the entire outer periphery of the main body portion 17 except for the circumferential position where the surrounding rubber elastic body 30 is provided.
In the illustrated example, the band rubber elastic body 32 connects the central portions of the two side portions in the direction of the central axis O.

また、本実施形態では、第１ゴム弾性体１３、囲繞ゴム弾性体３０および第２ゴム弾性体２９、さらにバンドゴム弾性体３２は、例えば天然ゴム等を主成分とする同一のゴム材料で一体に形成されている。なお、図示の例では、本体部１７の内周面には、第１ゴム弾性体１３が接着された部分を除いた部分の全域に膜状の被覆ゴム弾性体３３が接着されており、この被覆ゴム弾性体３３のうち、前記側面開口部２８を本体部１７の内側から閉塞する部分が、前記第２ゴム弾性体２９となっている。 In the present embodiment, the first rubber elastic body 13, the go rubber elastic body 30 and the second rubber elastic body 29, and the band rubber elastic body 32 are integrally formed of the same rubber material mainly composed of natural rubber, for example. Is formed. In the illustrated example, a film-like covering rubber elastic body 33 is bonded to the entire inner surface of the main body portion 17 except for the portion to which the first rubber elastic body 13 is bonded. A portion of the covering rubber elastic body 33 that closes the side opening 28 from the inside of the main body portion 17 is the second rubber elastic body 29.

ここで、本実施形態ではさらに、本体部１７および外郭筒部１８それぞれにおける前記中心軸線Ｏ方向の一端部同士も気密状態で嵌合しており、これにより、前述のようにバンドゴム弾性体３２および囲繞ゴム弾性体３０が外郭筒部１８の内周面に気密状態で当接していることと相俟って、第２ゴム弾性体２９が、外郭筒部１８の外部に対して気密に保たれている。すなわち、第２ゴム弾性体２９は、本体部１７の外周面と外郭筒部１８の内周面との間において、本体部１７と外郭筒部１８との前述した嵌合部分、バンドゴム弾性体３２および囲繞ゴム弾性体３０で囲まれた気密空間内に配置されている。
なお、本体部１７は外郭筒部１８に圧入されている。 Here, in the present embodiment, the end portions in the central axis O direction of each of the main body portion 17 and the outer cylindrical portion 18 are also fitted in an airtight state, whereby the band rubber elastic body 32 as described above. In addition, the second rubber elastic body 29 is kept airtight with respect to the outside of the outer cylindrical portion 18 in combination with the rubber elastic body 30 in contact with the inner peripheral surface of the outer cylindrical portion 18 in an airtight state. I'm leaning. In other words, the second rubber elastic body 29 is a band rubber elastic body between the outer peripheral surface of the main body portion 17 and the inner peripheral surface of the outer tube portion 18, the fitting portion between the main body portion 17 and the outer tube portion 18 described above. 32 and the surrounding rubber elastic body 30 are arranged in an airtight space.
The main body 17 is press-fitted into the outer cylinder 18.

以上説明したように、本実施形態による防振装置１０によれば、第２ゴム弾性体２９が外郭筒部１８の外部に対して気密に保たれているので、この第２ゴム弾性体２９が外気に接触してオゾン劣化し易くなるのを防ぐことが可能になる。したがって、第２ゴム弾性体２９を、例えば第１ゴム弾性体１３とは異なる耐オゾン性に優れたゴム材料（例えばクロロプレンゴム（ＣＲ）、エチレンプロピレン共重合体ゴム（ＥＰＲ、ＥＰＤＭ）等）で形成したり、その厚さを厚くしたりすることなく、この防振装置１０の長寿命化を図ることができる。
しかも、第２ゴム弾性体２９が外郭筒部１８の内周面と非接触状態で設けられているので、第１取付け部１１若しくは第２取付け部１２に振動が作用した際に生ずる第２ゴム弾性体２９の弾性変形若しくは振動が、外郭筒部１８の内周面によって阻害されるのを抑えることが可能になり、防振装置１０の制振性能が制限されるのを防ぐことができる。 As described above, according to the vibration isolator 10 according to the present embodiment, the second rubber elastic body 29 is kept airtight with respect to the outside of the outer cylindrical portion 18. It is possible to prevent the ozone from being easily deteriorated by contact with the outside air. Therefore, the second rubber elastic body 29 is made of, for example, a rubber material excellent in ozone resistance (for example, chloroprene rubber (CR), ethylene propylene copolymer rubber (EPR, EPDM), etc.) different from the first rubber elastic body 13. The life of the vibration isolator 10 can be extended without forming it or increasing its thickness.
Moreover, since the second rubber elastic body 29 is provided in a non-contact state with the inner peripheral surface of the outer cylindrical portion 18, the second rubber generated when vibration acts on the first mounting portion 11 or the second mounting portion 12. It is possible to suppress the elastic deformation or vibration of the elastic body 29 from being hindered by the inner peripheral surface of the outer cylindrical portion 18, and it is possible to prevent the vibration damping performance of the vibration isolator 10 from being limited.

また、本実施形態では、第１ゴム弾性体１３、囲繞ゴム弾性体３０および第２ゴム弾性体２９が同じゴム材料で一体に形成されているので、これらの各部材を高精度かつ容易に形成することが可能になり、前述の作用効果が確実に奏功されるとともに、この防振装置１０の高コスト化を抑えることができる。
さらに、第１ゴム弾性体１３が本体部１７の内周面に接着されるとともに、囲繞ゴム弾性体３０およびバンドゴム弾性体３２が本体部１７の外周面に接着されているので、防振装置１０の製造時において本体部１７を外郭筒部１８に容易に圧入することが可能になり、この防振装置１０の高コスト化を確実に防ぐことができる。 In the present embodiment, since the first rubber elastic body 13, the go rubber elastic body 30 and the second rubber elastic body 29 are integrally formed of the same rubber material, these members are formed with high precision and ease. As a result, the above-described effects can be reliably achieved, and the cost of the vibration isolator 10 can be suppressed.
Further, the first rubber elastic body 13 is bonded to the inner peripheral surface of the main body portion 17, and the go rubber elastic body 30 and the band rubber elastic body 32 are bonded to the outer peripheral surface of the main body portion 17. 10 can be easily press-fitted into the outer cylindrical portion 18 at the time of manufacture, and the cost of the vibration isolator 10 can be reliably prevented.

さらに、本実施形態では、第２ゴム弾性体２９は、囲繞ゴム弾性体３０によりその全周にわたって囲繞されているのではなく、少なくとも一部が、シール開口部３１を通して、本体部１７と外郭筒部１８との間の、バンドゴム弾性体３２を隔壁の一部とする気密空間内に開放されているので、囲繞ゴム弾性体３０を設けたことによって、第２ゴム弾性体２９の変形や振動が抑えられ防振装置１０の制振性能が制限されるのを防ぐことが可能になる。 Furthermore, in the present embodiment, the second rubber elastic body 29 is not surrounded by the surrounding rubber elastic body 30 over its entire circumference, but at least a part thereof passes through the seal opening 31 and the main body portion 17 and the outer cylinder. Since the surrounding rubber elastic body 30 is provided, the deformation and vibration of the second rubber elastic body 29 are provided. Is suppressed, and it is possible to prevent the vibration damping performance of the vibration isolator 10 from being limited.

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。
例えば、図３および図４に示されるように、バンドゴム弾性体３２を、囲繞ゴム弾性体３０において前記中心軸線Ｏ方向における両端部にそれぞれ、本体部１７の外周面に沿ってその周方向に連続して延在させて連結し、シール開口部３１を、囲繞ゴム弾性体３０の周端部に、この本体部１７の周方向に開口させるように形成してもよい。 The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, as shown in FIG. 3 and FIG. 4, the band rubber elastic body 32 is disposed in the circumferential direction along the outer peripheral surface of the main body portion 17 at both ends in the central axis O direction in the surrounding rubber elastic body 30. The seal opening 31 may be formed so as to open in the circumferential direction of the main body portion 17 at the peripheral end portion of the surrounding rubber elastic body 30.

図示の例では、バンドゴム弾性体３２は、囲繞ゴム弾性体３０を構成する前記４つの辺部のうち、前記上辺部、およびこの上辺部に前記中心軸線Ｏ方向で対向して配置された下辺部それぞれの両周端部同士を連結している。これにより、本体部１７の外周面において前記中心軸線Ｏ方向に互いに間隔あけた位置にそれぞれ、全周にわたって連続して外郭筒部１８の内周面に気密状態で当接するバンドゴム弾性体３２および囲繞ゴム弾性体３０が設けられている。また、シール開口部３１は、囲繞ゴム弾性体３０の周端部を前記周方向に貫通している。 In the illustrated example, the band rubber elastic body 32 includes the upper side portion of the four side portions constituting the surrounding rubber elastic body 30 and the lower side disposed opposite to the upper side portion in the central axis O direction. Both peripheral ends of each part are connected to each other. As a result, the band rubber elastic body 32 that is in continuous contact with the inner peripheral surface of the outer cylindrical portion 18 in an airtight state at positions spaced from each other in the direction of the central axis O on the outer peripheral surface of the main body portion 17. A go rubber elastic body 30 is provided. The seal opening 31 penetrates the circumferential end of the surrounding rubber elastic body 30 in the circumferential direction.

以上より、外郭筒部１８の内周面において前記中心軸線Ｏ方向で互いに間隔をあけた２箇所にそれぞれ、囲繞ゴム弾性体３０およびバンドゴム弾性体３２が、その全周にわたって連続して気密状態で当接することによって、第２ゴム弾性体２９を、シール開口部３１を通して本体部１７と外郭筒部１８との間の気密空間内に開放させた状態で、外郭筒部１８の外部に対して気密に保つようになっている。
この構成においても、図１および図２で示した前記実施形態と同様の作用効果が奏功されることになる。 As described above, the surrounding rubber elastic body 30 and the band rubber elastic body 32 are continuously airtight over the entire circumference at two locations spaced apart from each other in the direction of the central axis O on the inner peripheral surface of the outer cylindrical portion 18. The second rubber elastic body 29 is opened in the airtight space between the main body portion 17 and the outer tube portion 18 through the seal opening portion 31, so that the second rubber elastic body 29 is opened to the outside of the outer tube portion 18. Keep it airtight.
Even in this configuration, the same effects as those of the embodiment shown in FIGS. 1 and 2 can be achieved.

さらに、図１から図４に示す防振装置１０に代えて、例えば図５および図６に示すように、バンドゴム弾性体３２を設けずに、本体部１７の外周面において側面開口部２８の開口周縁部にその全周にわたって囲繞ゴム弾性体３０を設け、この囲繞ゴム弾性体３０を外郭筒部１８の内周面に気密状態で当接させるようにしてもよい。
なお、図示の例では、第２ゴム弾性体２９は、その外表面が本体部１７の内周面よりも径方向内方に位置されるようにして設けられている。また、外郭筒部１８の外周面はさらにブラケット筒部３４に嵌合されており、このブラケット筒部３４のブラケット３４ａが車体に取り付けられるようになっている。さらに、本体部１７および外郭筒部１８の前記中心軸線Ｏ方向の他端部（ダイヤフラム１９側）同士が嵌合している。
以上の構成においても、第２ゴム弾性体２９を、外郭筒部１８の外部に対して気密に保つことが可能になる。 Further, in place of the vibration isolator 10 shown in FIGS. 1 to 4, for example, as shown in FIGS. 5 and 6, the side opening 28 is formed on the outer peripheral surface of the main body portion 17 without providing the band rubber elastic body 32. The surrounding rubber elastic body 30 may be provided on the peripheral edge of the opening over the entire circumference, and the surrounding rubber elastic body 30 may be brought into contact with the inner peripheral surface of the outer cylindrical portion 18 in an airtight state.
In the illustrated example, the second rubber elastic body 29 is provided such that the outer surface thereof is positioned radially inward from the inner peripheral surface of the main body portion 17. Further, the outer peripheral surface of the outer tube portion 18 is further fitted into a bracket tube portion 34, and the bracket 34a of the bracket tube portion 34 is attached to the vehicle body. Furthermore, the other end portions (diaphragm 19 side) of the main body portion 17 and the outer cylindrical portion 18 in the direction of the central axis O are fitted.
Also in the above configuration, the second rubber elastic body 29 can be kept airtight with respect to the outside of the outer cylindrical portion 18.

また、第２ゴム弾性体２９は、その外表面が本体部１７の外周面と面一となるように設けてもよいし、本体部１７の外周面よりも径方向外方に突出させて設けてもよい。さらにまた、本体部１７の側面開口部２８を前記側面視四角形状としたが、例えば円形状や多角形状等としてもよい。
さらに、囲繞ゴム弾性体３０、およびバンドゴム弾性体３２をそれぞれ、本体部１７の外周面に接着したが、本体部１７が外郭筒部１８に囲繞された状態で、これらの本体部１７の外周面および外郭筒部１８の内周面に、囲繞ゴム弾性体３０およびバンドゴム弾性体３２が気密に当接する構成であれば、本体部１７の外周面に接着しなくてもよい。 Further, the second rubber elastic body 29 may be provided such that the outer surface thereof is flush with the outer peripheral surface of the main body portion 17, or provided so as to protrude radially outward from the outer peripheral surface of the main body portion 17. May be. Furthermore, although the side opening 28 of the main body portion 17 has a quadrangular shape as viewed from the side, it may have, for example, a circular shape or a polygonal shape.
Furthermore, the go rubber elastic body 30 and the band rubber elastic body 32 are respectively bonded to the outer peripheral surface of the main body portion 17, but the outer periphery of the main body portion 17 is in a state where the main body portion 17 is surrounded by the outer tube portion 18. As long as the surrounding rubber elastic body 30 and the band rubber elastic body 32 are in airtight contact with the inner peripheral surface of the surface and the outer cylindrical portion 18, it is not necessary to adhere to the outer peripheral surface of the main body portion 17.

また、前記実施形態では、第１ゴム弾性体１３、囲繞ゴム弾性体３０および第２ゴム弾性体２９、さらにバンドゴム弾性体３２を同じゴム材料で一体に形成したが、それぞれを別部材として形成してもよい。そして、このうち第２ゴム弾性体２９のみを、例えば耐オゾン性に優れたゴム材料（例えばクロロプレンゴム（ＣＲ）、エチレンプロピレン共重合体ゴム（ＥＰＲ、ＥＰＤＭ）等）で形成してもよい。 Moreover, in the said embodiment, although the 1st rubber elastic body 13, the go rubber elastic body 30, the 2nd rubber elastic body 29, and also the band rubber elastic body 32 were integrally formed with the same rubber material, each is formed as a separate member. May be. Of these, only the second rubber elastic body 29 may be formed of, for example, a rubber material excellent in ozone resistance (for example, chloroprene rubber (CR), ethylene propylene copolymer rubber (EPR, EPDM), etc.).

さらに、前記実施形態では、本体部１７の内部に、開閉部材２５、弾性部材３５およびアイドルオリフィス１６を設けたが、これらを設けなくてもよい。また、アイドルオリフィス１６を開閉させる構成は、前記実施形態に限らず、例えば電気的なアクチュエータ若しくは電磁バルブ等を本体部１７内に設けてもよい。 Furthermore, in the above-described embodiment, the opening / closing member 25, the elastic member 35, and the idle orifice 16 are provided inside the main body portion 17, but these may not be provided. Further, the configuration for opening and closing the idle orifice 16 is not limited to the above embodiment, and for example, an electric actuator or an electromagnetic valve may be provided in the main body portion 17.

また、図３および図４に示す実施形態では、本体部１７および外郭筒部１８それぞれにおける前記中心軸線Ｏ方向の一端部（第１ゴム弾性体１３側）同士を嵌合させたが、図５および図６に示すようにダイヤフラム１９側の他端部同士を嵌合させてもよい。あるいは、図５および図６に示す実施形態では、本体部１７および外郭筒部１８それぞれにおける前記中心軸線Ｏ方向の他端部（ダイヤフラム１９側）同士を嵌合させたが、図１から図４に示すように第１ゴム弾性体１３側の一端部同士を嵌合させてもよい。 In the embodiment shown in FIG. 3 and FIG. 4, one end portion (the first rubber elastic body 13 side) in the central axis O direction in each of the main body portion 17 and the outer cylindrical portion 18 is fitted. As shown in FIG. 6, the other end portions on the diaphragm 19 side may be fitted together. Alternatively, in the embodiment shown in FIGS. 5 and 6, the other end portions (diaphragm 19 side) in the central axis O direction in each of the main body portion 17 and the outer tube portion 18 are fitted to each other. As shown in FIG. 1, one end portions on the first rubber elastic body 13 side may be fitted together.

さらに、囲繞ゴム弾性体３０およびバンドゴム弾性体３２は設けずに、本体部１７および外郭筒部１８それぞれにおける前記中心軸線Ｏ方向の両端部同士を気密状態で嵌合させることにより、第２ゴム弾性体２９を外郭筒部１８の外部に対して気密に保つようにしてもよい。さらにまた、図１から図６に示す実施形態において、本体部１７および外郭筒部１８それぞれにおける前記中心軸線Ｏ方向の両端部同士を気密状態で嵌合させてもよい。 Furthermore, without providing the surrounding rubber elastic body 30 and the band rubber elastic body 32, both ends of the main body portion 17 and the outer cylindrical portion 18 in the direction of the central axis O are fitted in an airtight state, thereby providing the second rubber. The elastic body 29 may be kept airtight with respect to the outside of the outer cylindrical portion 18. Furthermore, in the embodiment shown in FIGS. 1 to 6, both end portions of the main body portion 17 and the outer cylindrical portion 18 in the direction of the central axis O may be fitted in an airtight state.

また、図１および図２に示す実施形態に代えて、シール開口部３１を、囲繞ゴム弾性体３０において前記中心軸線Ｏ方向における他端部（ダイヤフラム１９側）に形成し、本体部１７および外郭筒部１８それぞれにおける前記中心軸線Ｏ方向の他端部同士を気密状態で嵌合するようにしてもよい。 In place of the embodiment shown in FIGS. 1 and 2, the seal opening 31 is formed at the other end portion (diaphragm 19 side) in the central axis O direction of the surrounding rubber elastic body 30, and the main body portion 17 and the outer shell are formed. You may make it fit the other end parts of the said center axis line O direction in each cylinder part 18 in an airtight state.

さらにまた、図１から図６で示した実施形態では、第２ゴム弾性体２９を平板状体に形成しその全体を外郭筒部１８の内周面と非接触としたが、この第２ゴム弾性体２９の少なくとも一部が外郭筒部１８の内周面と非接触となっていれば、前記各実施形態に限られるものではない。例えば、図７に示されるように、第２ゴム弾性体２９の中央部に凸部２９ａを突設し、この第２ゴム弾性体２９において、凸部２９ａのみを外郭筒部１８の内周面に接触させ、その他の部分は外郭筒部１８の内周面と非接触にしてもよい。
この場合、防振装置１０の組み立て時に、この防振装置１０の制振性能を容易に微調整することが可能になる。 Furthermore, in the embodiment shown in FIG. 1 to FIG. 6, the second rubber elastic body 29 is formed in a flat plate shape, and the whole is made non-contact with the inner peripheral surface of the outer cylindrical portion 18. As long as at least a part of the elastic body 29 is not in contact with the inner peripheral surface of the outer cylindrical portion 18, the invention is not limited to the above embodiments. For example, as shown in FIG. 7, a convex portion 29 a is provided at the center of the second rubber elastic body 29, and only the convex portion 29 a is provided on the inner peripheral surface of the outer tube portion 18 in the second rubber elastic body 29. The other portions may be in non-contact with the inner peripheral surface of the outer cylindrical portion 18.
In this case, when the vibration isolator 10 is assembled, the vibration damping performance of the vibration isolator 10 can be easily finely adjusted.

防振装置の高コスト化を招いたり、制振性能を制限させたりすることなく、長寿命化を図ることができる。 The lifetime can be extended without increasing the cost of the vibration isolator or limiting the vibration control performance.

本発明に係る第１実施形態として示した防振装置の縦断面図である。It is a longitudinal section of the vibration isolator shown as a 1st embodiment concerning the present invention. 図１に示す防振装置において外郭筒部を除いた状態を示す斜視図である。It is a perspective view which shows the state which excluded the outer cylinder part in the vibration isolator shown in FIG. 本発明に係る第２実施形態として示した防振装置の縦断面図である。It is a longitudinal cross-sectional view of the vibration isolator shown as 2nd Embodiment concerning this invention. 図３に示す防振装置において外郭筒部を除いた状態を示す斜視図である。It is a perspective view which shows the state which excluded the outer cylinder part in the vibration isolator shown in FIG. 本発明に係る第３実施形態として示した防振装置の縦断面図である。It is a longitudinal cross-sectional view of the vibration isolator shown as 3rd Embodiment concerning this invention. 図５に示す防振装置において外郭筒部を除いた状態を示す斜視図である。FIG. 6 is a perspective view showing a state where an outer cylinder portion is removed from the vibration isolator shown in FIG. 5. 本発明に係る第４実施形態として示した防振装置の一部拡大縦断面図である。It is a partially expanded longitudinal cross-sectional view of the vibration isolator shown as 4th Embodiment concerning this invention.

Explanation of symbols

１０防振装置
１１第１取付け部
１２第２取付け部
１３第１ゴム弾性体
１４主液室
１５副液室
１６、２７オリフィス
１７本体部
１８外郭筒部
２４逆止弁
２５開閉部材
２８側面開口部
２９第２ゴム弾性体
３０囲繞ゴム弾性体
３１シール開口部
３２バンドゴム弾性体
３５弾性部材
Ｏ中心軸線 DESCRIPTION OF SYMBOLS 10 Vibration isolator 11 1st attachment part 12 2nd attachment part 13 1st rubber elastic body 14 Main liquid chamber 15 Sub liquid chamber 16, 27 Orifice 17 Main body part 18 Outer cylinder part 24 Check valve 25 Opening / closing member 28 Side opening part 29 Second rubber elastic body 30 Go rubber elastic body 31 Seal opening 32 Band rubber elastic body 35 Elastic member O Center axis

Claims

A first attachment portion coupled to one of the vibration generating portion and the vibration receiving portion;
A second attachment portion coupled to either the vibration generating portion or the vibration receiving portion;
A first rubber elastic body that elastically connects the first and second mounting portions;
A main liquid chamber in which liquid is sealed with the first rubber elastic body as a part of the partition wall, and the internal volume changes due to deformation of the first rubber elastic body;
A sub-liquid chamber in which at least a part of the partition wall is formed to be deformable and a liquid is enclosed;
An anti-vibration device comprising an orifice communicating with the main liquid chamber and the sub liquid chamber;
The first attachment portion includes a cylindrical main body portion having the main liquid chamber and the sub liquid chamber therein, and an outer cylinder portion surrounding the main body portion from the outside in the radial direction,
A side opening that opens into the main liquid chamber is formed in the peripheral wall of the main body, and a plate-like second rubber elastic body that closes the side opening is disposed outside the outer tube. The second rubber elastic body is not in contact with the inner peripheral surface of the outer tube portion, and is kept in an airtight state .
In the outer peripheral surface of the main body portion, an opening rubber peripheral body that is in airtight contact with the inner peripheral surface of the outer tube portion is provided at the opening peripheral portion of the side opening portion,
The second rubber elastic body is kept airtight with respect to the outside of the outer cylindrical portion by at least the surrounding rubber elastic body,
A seal opening that opens in the central axis direction is formed at one end of the vibration isolator in the central axis direction of the vibration isolator, and the main body portion is formed at both circumferential ends of the rubber elastic body. A band rubber elastic body extending continuously in the circumferential direction along the outer peripheral surface of the
The band rubber elastic body and the surrounding rubber elastic body abut on the inner peripheral surface of the outer cylinder portion in an airtight state, and one end portions in the central axis direction of the main body portion and the outer cylindrical portion are fitted in an airtight state. By doing so, the second rubber elastic body is kept airtight with respect to the outside of the outer cylindrical portion.

A first attachment portion coupled to one of the vibration generating portion and the vibration receiving portion;
A second attachment portion coupled to either the vibration generating portion or the vibration receiving portion;
A first rubber elastic body that elastically connects the first and second mounting portions;
A main liquid chamber in which liquid is sealed with the first rubber elastic body as a part of the partition wall, and the internal volume changes due to deformation of the first rubber elastic body;
A sub-liquid chamber in which at least a part of the partition wall is formed to be deformable and a liquid is enclosed;
An anti-vibration device comprising an orifice communicating with the main liquid chamber and the sub liquid chamber;
The first attachment portion includes a cylindrical main body portion having the main liquid chamber and the sub liquid chamber therein, and an outer cylinder portion surrounding the main body portion from the outside in the radial direction,
A side opening that opens into the main liquid chamber is formed in the peripheral wall of the main body, and a plate-like second rubber elastic body that closes the side opening is disposed outside the outer tube. The second rubber elastic body is not in contact with the inner peripheral surface of the outer tube portion, and is kept in an airtight state.
In the outer peripheral surface of the main body portion, an opening rubber peripheral body that is in airtight contact with the inner peripheral surface of the outer tube portion is provided at the opening peripheral portion of the side opening portion,
The second rubber elastic body is kept airtight with respect to the outside of the outer cylindrical portion by at least the surrounding rubber elastic body,
A band rubber elastic body continuously extending in the circumferential direction along the outer peripheral surface of the main body portion is connected to both ends of the vibration isolator in the central axis direction of the vibration isolator, and A seal opening that opens in the circumferential direction of the main body is formed at the peripheral end of the go rubber elastic body, and the band rubber elastic body and the go rubber elastic body are airtight on the inner peripheral surface of the outer cylinder portion. The anti-vibration device according to claim 1, wherein the second rubber elastic body is kept airtight with respect to an outside of the outer tube portion by contacting.

The vibration isolator according to claim 1 or 2,
The first rubber elastic body is bonded to the inner peripheral surface of the main body, and the first rubber elastic body and the second rubber elastic body are integrally formed of the same rubber material. Shaker.

The vibration isolator according to any one of claims 1 to 3,
An opening / closing member that is reciprocally movable in a space including a part of the orifice inside the main body, and that opens and closes the orifice by the reciprocation;
A check valve disposed between the main liquid chamber and the opening / closing member, and for allowing the liquid to flow only from the main liquid chamber to the opening / closing member;
An elastic member that urges the opening / closing member toward the check valve side,
Due to the deformation of the first rubber elastic body that occurs as vibration is applied to the vibration isolator, the main liquid chamber expands and contracts to change its internal volume, and along with the change in the internal volume of the main liquid chamber. An anti-vibration device characterized in that the orifice member is opened and closed by reciprocating the opening and closing member due to fluid pressure fluctuation.