JP4937223B2

JP4937223B2 - Liquid filled cylindrical vibration isolator

Info

Publication number: JP4937223B2
Application number: JP2008251517A
Authority: JP
Inventors: 顕片桐
Original assignee: Sumitomo Riko Co Ltd
Current assignee: Sumitomo Riko Co Ltd
Priority date: 2008-09-29
Filing date: 2008-09-29
Publication date: 2012-05-23
Anticipated expiration: 2028-09-29
Also published as: JP2010084790A

Description

本発明は、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、サブフレームマウント、ボディマウント、キャブマウント等として好適に採用される液体封入式筒型防振装置に関する。 The present invention relates to a liquid-filled cylindrical vibration isolator that is suitably employed as, for example, a suspension bush for an automobile, an engine mount, a subframe mount, a body mount, a cab mount, and the like.

従来より、自動車において振動伝達系を構成する二つの部材間に介装される防振連結体乃至は防振支持体の一種として、主軸部材とその外周側に離間して配設された外筒部材とをゴム弾性体で連結した筒型防振装置において、その内部に非圧縮性液体を封入し、振動入力時に惹起される液体の共振作用等を利用して防振効果を得るようにした液体封入式筒型防振装置が知られている。 2. Description of the Related Art Conventionally, as a type of anti-vibration coupling body or anti-vibration support body interposed between two members that constitute a vibration transmission system in an automobile, a main shaft member and an outer cylinder that is disposed apart from the outer periphery thereof In a cylindrical vibration isolator in which a member is connected with a rubber elastic body, an incompressible liquid is sealed in the inside thereof, and a vibration isolating effect is obtained by utilizing a resonance action of a liquid caused when vibration is input. A liquid-filled cylindrical vibration isolator is known.

このような液体封入式筒型防振装置は、一般に、主軸部材とその外周側に離間して配置された中間筒部材の径方向対向面間にゴム弾性体を配設すると共に、中間筒部材に対して外筒部材を外嵌固定した構造とされている。このような構造を採用することにより、中間筒部材に設けた窓部を通じて外周面に開口するように形成された凹部を外筒部材の外嵌固定によって液密に封止して、密閉構造の液体封入領域を容易に形成することが可能となる。また、主軸部材と外筒部材の間への軸直角方向の振動入力時に、非圧縮性液体の流動が効率的に生じせしめられるように、かかる液体封入領域は、一般に、主軸部材と外筒部材の軸直角方向対向面間において、主軸部材を軸直角方向に挟んだ両側部分に形成された複数の液室と、それらを互いに連通するオリフィス通路によって構成されている。 Such a liquid-filled cylindrical vibration isolator generally has a rubber elastic body disposed between radially opposed surfaces of a main shaft member and an intermediate cylinder member that is spaced apart from the outer peripheral side thereof, and an intermediate cylinder member. On the other hand, the outer cylinder member is fitted and fixed. By adopting such a structure, the concave portion formed so as to open to the outer peripheral surface through the window provided in the intermediate cylinder member is liquid-tightly sealed by the external fitting of the outer cylinder member, and the sealed structure It is possible to easily form the liquid enclosure region. In addition, in order to efficiently generate a flow of incompressible liquid at the time of vibration input in a direction perpendicular to the axis between the main shaft member and the outer cylinder member, such a liquid-filled region is generally provided with the main shaft member and the outer cylinder member. Are formed by a plurality of liquid chambers formed in both side portions sandwiching the main shaft member in the direction perpendicular to the axis, and an orifice passage communicating these with each other.

このような従来構造の液体封入式筒型防振装置では、振動入力時に、複数の液室間に惹起される相対的な圧力変動に基づいてオリフィス通路を通じての液体流動が生じせしめられることとなり、このオリフィス通路を流動せしめられる液体の共振作用を利用して、有効な防振効果を得ることが可能となる。 In such a conventional liquid-filled cylindrical vibration isolator, when a vibration is input, a liquid flow through the orifice passage is caused based on a relative pressure fluctuation caused between a plurality of liquid chambers. An effective vibration-proofing effect can be obtained by utilizing the resonance action of the liquid flowing through the orifice passage.

しかしながら、オリフィス通路を流動せしめられる液体の共振作用に基づく防振効果は比較的に狭い周波数域でしか発揮され得ず、特に防振を目的とする周波数域にチューニングされたオリフィス通路では、そのチューニング周波数よりも高周波数の振動入力時に流通抵抗が著しく増大して防振性能が大幅に低下してしまうという不具合があった。 However, the anti-vibration effect based on the resonance action of the liquid that can flow through the orifice passage can be exhibited only in a relatively narrow frequency range, and especially in the orifice passage tuned to the frequency range intended for anti-vibration. There is a problem that the vibration resistance is significantly reduced and the vibration isolation performance is greatly reduced when vibration is input at a frequency higher than the frequency.

また、衝撃的な振動入力時には、オリフィス通路を通じての液体流動が追従し得ずに、液室に対して大きな圧力変動が惹起されることとなり、それに伴って、衝撃的な振動が惹起されたり、封入液体における気相分離に起因する異音や振動の発生が問題となる場合があった。 In addition, at the time of shock vibration input, the liquid flow through the orifice passage cannot follow, and a large pressure fluctuation is caused to the liquid chamber, and accordingly, shock vibration is caused, Occurrence of abnormal noise or vibration due to gas phase separation in the sealed liquid may be a problem.

そこで、このような問題に対処するために、特許文献１には、オリフィス通路によって接続された二つの液室間に跨ってリリーフ流路を形成すると共に、このリリーフ流路内にゴム弾性体からなるシールリップを突設した構造が提案されている。即ち、通常の比較的振幅が小さい振動の入力時には、リリーフ流路がシールリップで遮断状態に維持されることから、オリフィス通路を通じて液室間での液体流動が許容されることにより減衰が生起される。そして、自動車走行中に突起乗り越し時等に大荷重が入力して、過渡的な大振幅の振動入力により液室間に著しい圧力差が発生した場合には、シールリップが弾性変形して隙間が生ぜしめられることにより、その隙間を通じてリリーフ流路が連通状態とされて液室間での液体流動が許容されて、液室における著しい圧力変動を解消するようになっている。その結果として、オリフィス通路を通じての液体流動による減衰特性が失われ、低動ばね特性が得られる。 Therefore, in order to cope with such a problem, in Patent Document 1, a relief flow path is formed across two liquid chambers connected by an orifice passage, and a rubber elastic body is formed in the relief flow path. The structure which protruded the seal lip which becomes is proposed. That is, at the time of normal vibration input with relatively small amplitude, the relief flow path is maintained in the blocked state by the seal lip, so that the liquid flow between the liquid chambers is allowed through the orifice passage, thereby causing attenuation. The When a large load is input when the car is running over a protrusion and a significant pressure difference is generated between the liquid chambers due to a transient large amplitude vibration input, the seal lip is elastically deformed and a gap is formed. As a result, the relief flow path is brought into a communication state through the gap, and the liquid flow between the liquid chambers is allowed, so that the significant pressure fluctuation in the liquid chamber is eliminated. As a result, the damping characteristic due to the liquid flow through the orifice passage is lost, and a low dynamic spring characteristic is obtained.

しかしながら、特許文献１に開示された従来構造では、シールリップの突出先端面がリリーフ流路の内面に押し付けられることでリリーフ流路が遮断状態に維持されるようになっていることから、シールリップの開閉動作に際して、シールリップとリリーフ流路内面との擦れが発生する。そのため、シールリップの磨耗が避けられず、開閉動作を繰り返した耐久劣化後に、シールリップ（リーク弁）としての特性を保持し難いことから、長期間に亘って安定した動作を望むことができないという問題があった。 However, in the conventional structure disclosed in Patent Document 1, the relief flow path is maintained in a blocked state by pressing the protruding tip surface of the seal lip against the inner surface of the relief flow path. During the opening / closing operation, rubbing between the seal lip and the inner surface of the relief flow path occurs. Therefore, wear of the seal lip is unavoidable, and it is difficult to maintain the characteristics as a seal lip (leak valve) after durability deterioration after repeated opening and closing operations, so that stable operation over a long period of time cannot be desired. There was a problem.

なお、特許文献２には、主軸部材に対して特別な環状部材を外嵌固定し、この環状部材に対して二つの液室を相互に連通する通路を形成すると共に、かかる通路の液室への開口部に逆止弁を設けた構造が提案されている。また、特許文献３には、中間筒部材の凹溝に通路部材を組み込んで、外筒部材との間に配設し、リリーフ流路を形成すると共に、リリーフ流路の一方の開口を弾性弁体によって蓋をした構造が提案されている。これら特許文献２及び３に提案された構造であれば、通路の内面に接触しない形態の逆止弁や弾性弁体を構成することが可能となるので、それら逆止弁や弾性弁体の磨耗や動作のばらつきを回避することができる。 In Patent Document 2, a special annular member is fitted and fixed to the main shaft member, and a passage for communicating the two liquid chambers with each other is formed on the annular member. The structure which provided the non-return valve in the opening part of this is proposed. Further, in Patent Document 3, a passage member is incorporated in the concave groove of the intermediate cylinder member and disposed between the outer cylinder member to form a relief flow path, and one opening of the relief flow path is provided with an elastic valve. A structure with a lid on the body has been proposed. If it is the structure proposed in these patent documents 2 and 3, it becomes possible to constitute a check valve or an elastic valve body in a form that does not contact the inner surface of the passage. And variations in operation can be avoided.

しかしながら、特許文献２及び３で採用される逆止弁や弾性弁体は、ゴム等の弾性体で形成されていることから、液圧による特性切り替えの調整が非常に困難であるという問題があった。
特開平１−２５５７３６号公報特公平７−９２１０６号公報特開２００６−２８５７号公報 However, since the check valve and the elastic valve element adopted in Patent Documents 2 and 3 are formed of an elastic body such as rubber, there is a problem that it is very difficult to adjust the characteristic switching by the hydraulic pressure. It was.
Japanese Unexamined Patent Publication No. 1-255736 Japanese Patent Publication No. 7-92106 JP 2006-2857 A

本発明は、上記事情に鑑みてなされたものであり、高減衰特性と低動ばね特性の両立を図りつつ、耐久性に優れ、チューニングを有利に行うことができる液体封入式筒型防振装置を提供することを解決すべき課題とするものである。 The present invention has been made in view of the above circumstances, and is a liquid-filled cylindrical vibration damping device that is excellent in durability and can be advantageously tuned while achieving both high damping characteristics and low dynamic spring characteristics. It is a problem to be solved to provide.

以下、上記課題を解決するのに適した各手段について、必要に応じて作用効果等を付記しつつ説明する。 Hereinafter, each means suitable for solving the above-described problems will be described while adding effects and the like as necessary.

〔手段１〕手段１に係る液体封入式筒型防振装置は、
主軸部材と、
該主軸部材の外周側に離間して同軸状に又は偏心して配設された外筒部材と、
前記主軸部材と前記外筒部材との間に介装されて両部材を一体的に連結するゴム弾性体と、
前記主軸部材と前記外筒部材との径方向対向面間に周方向に離間して配設され、少なくとも前記ゴム弾性体と薄肉弾性膜により区画された複数の液室と、
複数の前記液室を互いに連通するオリフィス通路と、
を備え、
前記外筒部材は、
金属板ばね支持部と、
各前記液室の前記薄肉弾性膜に近接するように配置され、各前記液室内の圧力変動により前記金属板ばね支持部に対して撓み変形可能となるように前記金属板ばね支持部に支持される金属板ばね作動部と、
を有することを特徴としている。 [Means 1] A liquid-filled cylindrical vibration isolator according to the means 1 comprises:
A main shaft member;
An outer cylindrical member disposed coaxially or eccentrically apart from the outer peripheral side of the main shaft member;
A rubber elastic body interposed between the main shaft member and the outer cylinder member and integrally connecting the two members;
A plurality of liquid chambers spaced apart in the circumferential direction between radially opposed surfaces of the main shaft member and the outer cylinder member and partitioned by at least the rubber elastic body and a thin elastic film;
An orifice passage communicating the plurality of liquid chambers with each other;
With
The outer cylinder member is
A metal leaf spring support,
Each of the liquid chambers is disposed so as to be close to the thin elastic membrane, and is supported by the metal leaf spring support portion so as to be able to bend and deform with respect to the metal leaf spring support portion due to pressure fluctuation in each liquid chamber. A metal leaf spring operating part,
It is characterized by having.

手段１において、自動車走行中に通常の比較的振幅の小さい振動が入力した場合には、オリフィス通路を通じて液室間での液体流動が許容されることにより減衰が生起され、これにより、振動が効果的に抑制される。そして、自動車走行中に突起乗り越し時等に大荷重が入力して、過渡的な大振幅の振動入力により液室間に著しい圧力差が発生した場合には、各液室の開口部を覆蓋するように配置された金属板ばね作動部が撓み変形することにより、液室における著しい圧力変動が解消される。その結果、オリフィス通路を通じての液体流動による減衰特性が失われ、低動ばね特性が得られる。これにより、高減衰特性と低動ばね特性の相反する特性が両立される。 In the first means, when normal vibration having a relatively small amplitude is input while the vehicle is running, the liquid flow between the liquid chambers is allowed through the orifice passage, thereby causing the damping. Is suppressed. Then, when a large load is input when riding over a protrusion while the vehicle is running and a significant pressure difference is generated between the liquid chambers due to a transient large amplitude vibration input, the openings of the liquid chambers are covered. The metal plate spring actuating portion arranged in such a manner bends and deforms, thereby eliminating a significant pressure fluctuation in the liquid chamber. As a result, the damping characteristic due to the liquid flow through the orifice passage is lost, and a low dynamic spring characteristic is obtained. As a result, the contradictory characteristics of the high damping characteristic and the low dynamic spring characteristic are compatible.

手段１において、各液室内の圧力調整機構に採用されている金属板ばねは、上記従来においてリーク弁として採用されていたゴム製の逆止弁や弾性弁体に比べて、耐久性に優れるばかりでなく、ばね特性のばらつきが少なく、環境温度の影響による特性変化も少ない。また、金属板ばねは、ゴム製の逆止弁や弾性弁体に比べて、設計自由度が高いので、剛性と形状の調整によって、液室の内圧に対して多段的に特性変更が可能となる。そのため、チューニングがし易く、チューニングを有利に行うことが可能となる。 In the means 1, the metal leaf spring employed in the pressure adjusting mechanism in each liquid chamber is excellent in durability as compared with the rubber check valve and the elastic valve element conventionally employed as the leak valve. In addition, there is little variation in spring characteristics, and there is little change in characteristics due to the influence of environmental temperature. In addition, metal leaf springs have a higher degree of design freedom compared to rubber check valves and elastic valve elements, so characteristics can be changed in multiple stages with respect to the internal pressure of the liquid chamber by adjusting rigidity and shape. Become. Therefore, tuning is easy and tuning can be performed advantageously.

したがって、手段１によれば、高減衰特性と低動ばね特性の両立を図りつつ、耐久性に優れ、チューニングを有利に行うことができる液体封入式筒型防振装置を実現することができる。 Therefore, according to the means 1, it is possible to realize a liquid-filled cylindrical vibration damping device that is excellent in durability and can be tuned advantageously while achieving both high damping characteristics and low dynamic spring characteristics.

〔手段２〕手段１に記載の液体封入式筒型防振装置において、前記外筒部材は、前記金属板ばね作動部の径方向外方に配置されて前記金属板ばね作動部の過大な変位を規制するストッパ部を有することを特徴としている。 [Means 2] In the liquid-filled cylindrical vibration isolator according to the means 1, the outer cylinder member is disposed radially outward of the metal leaf spring operating portion, and the metal plate spring operating portion is excessively displaced. It is characterized by having a stopper portion for regulating the above.

手段２によれば、金属板ばね作動部の過大な変位が規制されることによって、薄肉弾性膜の破損等を防止することができるので、耐久性の向上を図ることができる。なお、ストッパ部は、例えば金属板ばねの外周側に、外筒部材の構成要素となる筒状部材が装着される場合には、その筒状部材を利用することができる。また、その液体封入式筒型防振装置が嵌合固定されて取り付けられるアーム部材の嵌合孔を利用することもできる。 According to the means 2, since the excessive displacement of the metal plate spring operating portion is restricted, the thin elastic film can be prevented from being damaged, so that the durability can be improved. In addition, when the cylindrical member used as the component of an outer cylinder member is mounted | worn with the stopper part on the outer peripheral side of a metal leaf | plate spring, for example, the cylindrical member can be utilized. Further, the fitting hole of the arm member to which the liquid-filled cylindrical vibration isolator is fitted and fixed can be used.

〔手段３〕手段２に記載の液体封入式筒型防振装置において、前記ストッパ部は、前記金属板ばね作動部との間に形成される前記金属板ばね作動部の作動空間部と大気空間とを連通する連通孔を有することを特徴としている。 [Means 3] In the liquid-filled cylindrical vibration isolator according to the means 2, the stopper portion is formed between the metal leaf spring operating portion and the atmospheric space formed between the metal leaf spring operating portion. It has the characteristic that it has a communicating hole which connects.

手段３によれば、作動空間部が密閉空間にされていないので、作動空間部の空気が金属板ばね作動部の動作に及ぼす悪影響を低減することができる。なお、ストッパ部に設けられた連通孔は、液体封入式筒型防振装置の組付を液室に封入すべき液体中に浸漬した状態で行う場合に、作動空間部に溜まった液体を外部へ排出させる排出孔として利用することができる。 According to the means 3, since the working space is not a sealed space, it is possible to reduce the adverse effect of the air in the working space on the operation of the metal leaf spring working part. In addition, the communication hole provided in the stopper part allows the liquid accumulated in the working space part to be externally attached when the liquid-filled cylindrical vibration isolator is assembled in a state where it is immersed in the liquid to be sealed in the liquid chamber. It can be used as a discharge hole to be discharged.

〔手段４〕手段１〜３の何れか一つに記載の液体封入式筒型防振装置において、前記金属板ばね作動部と前記薄肉弾性膜は、少なくとも一部が接着されていることを特徴としている。 [Means 4] In the liquid-filled cylindrical vibration isolator according to any one of means 1 to 3, at least a part of the metal plate spring operating portion and the thin elastic film are bonded. It is said.

手段４によれば、金属板ばね作動部と薄肉弾性膜の摺動部分をなくすことができるので、摺動に弱い材質を使用した場合でも耐久性に優れる。 According to the means 4, since the sliding portion between the metal leaf spring operating portion and the thin elastic film can be eliminated, even when a material weak to sliding is used, the durability is excellent.

〔手段５〕手段１〜３の何れか一つに記載の液体封入式筒型防振装置において、前記薄肉弾性膜は、前記金属板ばね作動部の径方向内方に重なり合うように配置され、前記金属板ばね作動部と前記薄肉弾性膜は、少なくとも一部が非接着とされていることを特徴としている。 [Means 5] In the liquid-filled cylindrical vibration damping device according to any one of Means 1 to 3, the thin elastic film is disposed so as to overlap inward in the radial direction of the metal leaf spring operating portion, The metal plate spring operating portion and the thin elastic film are characterized in that at least a part thereof is not bonded.

手段５によれば、薄肉弾性膜が部分的に金属板ばね作動部に引っ張られることなく、金属板ばね作動部の撓み変形動作に追従することができるので、伸びに弱い材質を使用した場合でも薄肉弾性膜の耐久性が向上する。 According to the means 5, since the thin elastic film can follow the bending deformation operation of the metal leaf spring operating portion without being partially pulled by the metal leaf spring operating portion, even when a material weak in elongation is used. The durability of the thin elastic film is improved.

〔手段６〕手段１〜５の何れか一つに記載の液体封入式筒型防振装置において、前記外筒部材は、前記金属板ばね支持部及び前記金属板ばね作動部を備えた内周筒状部材と該内周筒状部の外周側に装着された筒状部材を有することを特徴としている。 [Means 6] In the liquid-filled cylindrical vibration damping device according to any one of Means 1 to 5, the outer cylinder member includes an inner circumference provided with the metal plate spring support portion and the metal plate spring operation portion. It has the cylindrical member and the cylindrical member with which the outer peripheral side of this inner peripheral cylindrical part was mounted | worn.

手段６によれば、外筒部材に筒状部材が付加されることによって、更に頑強な構造の液体封入式筒型防振装置を得ることができ、防振特性をより安定して発揮させることが可能となる。 According to the means 6, by adding the cylindrical member to the outer cylindrical member, it is possible to obtain a liquid-filled cylindrical vibration isolator having a more robust structure, and to exhibit the vibration isolation characteristics more stably. Is possible.

〔手段７〕手段１〜６の何れか一つに記載の液体封入式筒型防振装置において、前記外筒部材と前記ゴム弾性体の間には、前記薄肉弾性膜と対応する位置に設けられた複数の窓部を有する中間筒部材を有することを特徴としている。 [Means 7] In the liquid-filled cylindrical vibration isolator according to any one of Means 1 to 6, the liquid-sealed cylindrical vibration isolator is provided between the outer cylinder member and the rubber elastic body at a position corresponding to the thin elastic film. An intermediate cylinder member having a plurality of window portions is provided.

手段７によれば、外筒部材に中間筒部材が付加されることによって、より頑強な構造の液体封入式筒型防振装置を得ることができ、防振特性を安定して発揮させることが可能となる。 According to the means 7, by adding the intermediate cylinder member to the outer cylinder member, a liquid-filled cylindrical vibration isolator having a more robust structure can be obtained, and the vibration isolation characteristics can be stably exhibited. It becomes possible.

以下、本発明の実施形態を図面に基づいて説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

図１は本実施形態に係る液体封入式筒型防振装置の軸直角方向に沿う断面図であって図２のＩ−Ｉ線矢視断面図であり、図２はその液体封入式筒型防振装置の軸方向に沿う断面図であって図１のII−II線矢視断面図である。 FIG. 1 is a cross-sectional view taken along the direction perpendicular to the axis of the liquid-filled cylindrical vibration isolator according to the present embodiment, and is a cross-sectional view taken along the line I-I of FIG. It is sectional drawing in alignment with the axial direction of a vibration isolator, Comprising: It is the II-II sectional view taken on the line of FIG.

本実施形態の液体封入式筒型防振装置は、図１及び図２に示すように、主軸部材１０と、主軸部材１０の外周側に離間して同軸状に配設された外筒部材（中間筒部材２０、金属板ばね４０、薄肉弾性膜５０及び筒状部材６０）と、主軸部材１０と外筒部材との間に介装されたゴム弾性体３０と、主軸部材１０と外筒部材との径方向対向面間に配設された一対の液室７１、７２と、両液室７１、７２を互いに連通する二つのオリフィス通路７３、７４と、から構成されている。 As shown in FIGS. 1 and 2, the liquid-filled cylindrical vibration isolator of the present embodiment includes a main shaft member 10 and an outer cylinder member (coaxially disposed apart from the outer peripheral side of the main shaft member 10). Intermediate cylinder member 20, metal leaf spring 40, thin elastic film 50 and cylindrical member 60), rubber elastic body 30 interposed between main shaft member 10 and outer cylindrical member, main shaft member 10 and outer cylindrical member And a pair of liquid chambers 71 and 72 disposed between the surfaces facing each other in the radial direction, and two orifice passages 73 and 74 communicating the liquid chambers 71 and 72 with each other.

主軸部材１０は、鉄系金属により略一定の径と肉厚をもつパイプ状に形成されており、取付ボルト（図示せず）が挿通される内孔１１を有する。 The main shaft member 10 is formed of a ferrous metal into a pipe shape having a substantially constant diameter and thickness, and has an inner hole 11 through which a mounting bolt (not shown) is inserted.

主軸部材１０の外周側には、薄肉大径円筒形状の中間筒部材２０が所定距離を隔てて同軸状に配置されている。この中間筒部材２０の軸方向長さは、主軸部材１０の軸方向長さよりも小さくされており、主軸部材１０の軸方向両端部が中間筒部材２０の両端から軸方向外方に突出されている。この中間筒部材２０は、軸方向両端に位置する一対のリング部２１、２２と、軸方向に延び両リング部２１、２２間に架橋された２つの架橋部２３、２４とからなる。中間筒部材２０の周方向における両架橋部２３、２４の間の部分には、軸方向の両側が一対のリング部２１、２２により区画されて周方向に配列された２個の窓部２５、２６が形成されている。２個の窓部２５、２６は、径方向において対向する位置に設けられている。なお、両架橋部２３、２４は、両端部が折り曲げられて、両リング部２１、２２よりも径方向内方に位置している。 On the outer peripheral side of the main shaft member 10, a thin large-diameter cylindrical intermediate cylinder member 20 is coaxially disposed with a predetermined distance therebetween. The axial length of the intermediate cylindrical member 20 is smaller than the axial length of the main shaft member 10, and both axial end portions of the main shaft member 10 protrude outward in the axial direction from both ends of the intermediate cylindrical member 20. Yes. The intermediate cylinder member 20 includes a pair of ring portions 21 and 22 located at both ends in the axial direction, and two bridging portions 23 and 24 that extend in the axial direction and are bridged between the ring portions 21 and 22. In the portion between the two bridging portions 23 and 24 in the circumferential direction of the intermediate cylindrical member 20, two window portions 25 that are divided in the circumferential direction by dividing both sides in the axial direction by a pair of ring portions 21 and 22; 26 is formed. The two window portions 25 and 26 are provided at positions facing each other in the radial direction. Both bridging portions 23 and 24 are bent at both ends, and are located radially inward of the ring portions 21 and 22.

主軸部材１０と中間筒部材２０の径方向対向面間には、ゴム弾性体３０が周方向の略全周に亘って介装されている。このゴム弾性体３０は、その外周面が中間筒部材２０の内周面に加硫接着されていると共に、その内周面が主軸部材１０の外周面に加硫接着されていることにより、それら主軸部材１０及び中間筒部材２０を有する一体加硫成形品として形成されている。 A rubber elastic body 30 is interposed between the radially opposing surfaces of the main shaft member 10 and the intermediate cylinder member 20 over substantially the entire circumference in the circumferential direction. The rubber elastic body 30 has an outer peripheral surface vulcanized and bonded to the inner peripheral surface of the intermediate cylinder member 20, and an inner peripheral surface thereof is vulcanized and bonded to the outer peripheral surface of the main shaft member 10. It is formed as an integrally vulcanized molded product having a main shaft member 10 and an intermediate cylinder member 20.

ゴム弾性体３０の軸方向中央部分には、主軸部材１０を挟んだ径方向一方向（図１における上下方向）で対向するようにして一対の凹部３１、３２が設けられている。各凹部３１、３２は、それぞれ、中間筒部材２０に設けられた窓部２５、２６を通じて、ゴム弾性体３０の外周面に開口している。各凹部３１、３２の深さ寸法は、主軸部材１０までは僅かに至らない大きさとされていると共に、各凹部３１、３２の周方向寸法は、ゴム弾性体３０の周方向長さの半周以下とされている。また、ゴム弾性体３０の外周面において中間筒部材２０の各架橋部２３、２４の外周側には、各架橋部２３、２４に沿って周方向に延び、両端が凹部３１、３２に開口するオリフィス溝が形成されている。 A pair of concave portions 31 and 32 are provided at the central portion in the axial direction of the rubber elastic body 30 so as to face each other in one radial direction (up and down direction in FIG. 1) with the main shaft member 10 interposed therebetween. The recesses 31 and 32 open to the outer peripheral surface of the rubber elastic body 30 through windows 25 and 26 provided in the intermediate cylinder member 20, respectively. The depth dimensions of the recesses 31 and 32 are not so large as to reach the main shaft member 10, and the circumferential dimension of the recesses 31 and 32 is equal to or less than a half circumference of the circumferential length of the rubber elastic body 30. It is said that. Further, on the outer peripheral surface of the rubber elastic body 30, on the outer peripheral side of each bridging portion 23, 24 of the intermediate cylinder member 20, it extends in the circumferential direction along each bridging portion 23, 24, and both ends open to the recesses 31, 32. An orifice groove is formed.

ゴム弾性体３０の径方向外方には、円筒状のものが軸線に沿って半円筒状に二分割形成された金属板ばね４０、４０が配設されており、この金属板ばね４０、４０は内周筒状部材を形成している。一方の金属板ばね４０は、図３（展開図）及び図４（平面図）に示すように、矩形の鋼板にＨ形状の切欠部を形成することにより、Ｈ形状の周囲の部分よりなる支持部４１と、Ｈ形状の内側の部分よりなる一対の作動部４２、４３が設けられている。一対の作動部４２、４３は、両側の基端部から中央に向かって延出しており、それらの対向する先端部には、径方向内方に向かって更に湾曲した状態の湾曲部４２ａ、４３ａが形成されている。金属板ばね４０、４０の軸方向長さは、中間筒部材２０と略同じにされている。 On the radially outer side of the rubber elastic body 30, metal leaf springs 40, 40, which are cylindrically divided into two semi-cylindrical shapes along the axis, are disposed. Forms an inner circumferential cylindrical member. As shown in FIG. 3 (development view) and FIG. 4 (plan view), one metal leaf spring 40 is formed by forming an H-shaped notch in a rectangular steel plate, thereby supporting the surrounding portion of the H-shape. A pair of actuating portions 42 and 43 each having a portion 41 and an H-shaped inner portion are provided. The pair of operating portions 42 and 43 extend from the base end portions on both sides toward the center, and the bending portions 42a and 43a in a state of being further curved inward in the radial direction at their opposing tip portions. Is formed. The axial lengths of the metal leaf springs 40 are substantially the same as those of the intermediate cylinder member 20.

各金属板ばね４０、４０の内周面には、ゴムよりなる薄肉弾性膜５０、５０がそれぞれ接着されている。各薄肉弾性膜５０、５０は、各金属板ばね４０、４０の内周面を全面に亘って覆うようにされている。これにより、支持部４１と各作動部４２、４３との間に形成されている隙間部（Ｈ形状の切欠部）が閉塞されている。このように薄肉弾性膜５０、５０が一体となった各金属板ばね４０、４０は、ゴム弾性体３０の外周側から各作動部４２、４３の湾曲部４２ａ、４３ａが凹部３１、３２の中央部に位置するように装着されて、主軸部材１０と同軸状に配置されている。これにより、ゴム弾性体３０の各凹部３１、３２は、薄肉弾性膜５０、５０により液密的に覆蓋されて液室７１、７２となり、各オリフィス溝はオリフィス通路７３、７４となる。なお、薄肉弾性膜５０、５０及び金属板ばね４０、４０のゴム弾性体３０への装着作業は、液室７１、７２及びオリフィス通路７３、７４に封入すべき液体Ｌ中に浸漬した状態で行うことによって、液室７１、７２及びオリフィス通路７３、７４に液体Ｌが封入されている。 Thin elastic films 50 and 50 made of rubber are bonded to the inner peripheral surfaces of the metal plate springs 40 and 40, respectively. Each thin elastic film 50, 50 is configured to cover the entire inner peripheral surface of each metal leaf spring 40, 40. Thereby, the clearance gap part (H-shaped notch part) formed between the support part 41 and each action | operation parts 42 and 43 is obstruct | occluded. In this way, the metal leaf springs 40, 40 in which the thin elastic films 50, 50 are integrated, the curved portions 42 a, 43 a of the operating portions 42, 43 from the outer peripheral side of the rubber elastic body 30 are the centers of the recesses 31, 32. The main shaft member 10 is disposed coaxially with the main shaft member 10. Accordingly, the recesses 31 and 32 of the rubber elastic body 30 are liquid-tightly covered with the thin elastic films 50 and 50 to form liquid chambers 71 and 72, and the orifice grooves become orifice passages 73 and 74. The attaching operation of the thin elastic films 50 and 50 and the metal leaf springs 40 and 40 to the rubber elastic body 30 is performed in a state of being immersed in the liquid L to be sealed in the liquid chambers 71 and 72 and the orifice passages 73 and 74. As a result, the liquid L is sealed in the liquid chambers 71 and 72 and the orifice passages 73 and 74.

そして、金属板ばね４０、４０の外周側には、内周面にシールゴム層６１が加硫成形された外周筒状部材６０が圧入により外嵌されて、金属板ばね４０、４０及び主軸部材１０と同軸状に配置されている。この外周筒状部材６０の軸方向長さは、金属板ばね４０、４０及び中間筒部材２０と略同じである。金属板ばね４０、４０の湾曲部４２ａ、４３ａの外周面と外周筒状部材６０のシールゴム層６１の内周面との間には、湾曲部４２ａ、４３ａの径方向外方への作動を可能にする作動空間部６２、６２が形成されている。外周筒状部材６０及びシールゴム層６１の作動空間部６２、６２と対向する部位は、湾曲部４２ａ、４３ａ（作動部４２、４３）の過大な変位を規制するストッパ部６３、６３を構成している。各ストッパ部６３、６３には、作動空間部６２、６２と外部の大気空間とを連通する連通孔６４、６４が設けられている。この連通孔６４、６４が設けられていることにより、作動空間部６２、６２の空気が金属板ばね４０、４０の作動部４２、４３の動作に及ぼす悪影響を低減するようにしている。 Then, on the outer peripheral side of the metal plate springs 40, 40, an outer peripheral cylindrical member 60 in which a seal rubber layer 61 is vulcanized and formed on the inner peripheral surface is fitted by press fitting, and the metal plate springs 40, 40 and the main shaft member 10 are fitted. And are arranged coaxially. The axial length of the outer peripheral cylindrical member 60 is substantially the same as that of the metal plate springs 40 and 40 and the intermediate cylindrical member 20. Between the outer peripheral surfaces of the curved portions 42a and 43a of the metal leaf springs 40 and 40 and the inner peripheral surface of the sealing rubber layer 61 of the outer peripheral cylindrical member 60, the bending portions 42a and 43a can be operated radially outward. Working space portions 62, 62 are formed. The portions of the outer cylindrical member 60 and the seal rubber layer 61 facing the working space portions 62, 62 constitute stopper portions 63, 63 that restrict excessive displacement of the curved portions 42a, 43a (actuating portions 42, 43). Yes. The stopper portions 63 and 63 are provided with communication holes 64 and 64 for communicating the working space portions 62 and 62 with the external atmospheric space. By providing the communication holes 64, 64, adverse effects of the air in the working space portions 62, 62 on the operation of the working portions 42, 43 of the metal leaf springs 40, 40 are reduced.

なお、この外周筒状部材６０の金属板ばね４０、４０外周への取付作業は、液体Ｌ中での金属板ばね４０、４０のゴム弾性体３０への装着作業に続いて、液体Ｌ中において行われる。このとき、外周筒状部材６０に設けられた連通孔６４、６４は、作動空間部６２、６２に溜まった液体Ｌの排出用の孔として利用される。 The outer cylindrical member 60 is attached to the outer periphery of the metal plate springs 40 and 40 in the liquid L following the mounting operation of the metal plate springs 40 and 40 on the rubber elastic body 30 in the liquid L. Done. At this time, the communication holes 64, 64 provided in the outer cylindrical member 60 are used as holes for discharging the liquid L accumulated in the working space portions 62, 62.

以上のように構成された本実施形態の液体封入式筒型防振装置は、自動車のサスペンションブッシュ等に用いられる。そして、自動車走行中に通常の比較的振幅の小さい振動が入力した場合には、オリフィス通路７３、７４を通じて液室７１、７２間での液体流動が許容されることにより減衰が生起され、これにより、振動が効果的に抑制される。そして、自動車走行中に突起乗り越し時等に大荷重が入力して、過渡的な大振幅の振動入力により液室７１、７２間に著しい圧力差が発生した場合には、各液室７１、７２の開口部を覆蓋するように配置された金属板ばね４０、４０の作動部４２、４３が撓み変形することにより、液室７１、７２における著しい圧力変動が解消されるとともに低動ばね特性が得られる。これにより、高減衰特性と低動ばね特性の相反する特性が両立される。 The liquid-filled cylindrical vibration isolator of the present embodiment configured as described above is used for a suspension bush or the like of an automobile. When a normal vibration with a relatively small amplitude is input while the vehicle is running, the liquid flow between the liquid chambers 71 and 72 is allowed through the orifice passages 73 and 74, thereby causing attenuation. Vibration is effectively suppressed. Then, when a large load is input when the car rides over a protrusion and a significant pressure difference is generated between the liquid chambers 71 and 72 due to a transient large amplitude vibration input, the liquid chambers 71 and 72 When the operating portions 42 and 43 of the metal leaf springs 40 and 40 arranged so as to cover the openings of the metal plates are bent and deformed, significant pressure fluctuations in the liquid chambers 71 and 72 are eliminated and a low dynamic spring characteristic is obtained. It is done. As a result, the contradictory characteristics of the high damping characteristic and the low dynamic spring characteristic are compatible.

そして、各液室７１、７２内の圧力調整機構に採用されている金属板ばね４０、４０は、従来、リーク弁として採用されていたゴム製の逆止弁や弾性弁体に比べて、耐久性に優れるばかりでなく、ばね特性のばらつきが少なく、環境温度の影響による特性変化も少ない。また、金属板ばね４０、４０は、ゴム製の逆止弁や弾性弁体に比べて、設計自由度が高いので、剛性と形状の調整によって、液室７１、７２の内圧に対して多段的に特性変更が可能となる。そのため、チューニングがし易く、チューニングを有利に行うことが可能となる。 The metal leaf springs 40, 40 employed in the pressure adjusting mechanisms in the liquid chambers 71, 72 are more durable than rubber check valves and elastic valve bodies that have been conventionally employed as leak valves. Not only is it excellent in performance, there is little variation in spring characteristics, and there is also little change in characteristics due to the influence of environmental temperature. In addition, the metal leaf springs 40 and 40 have a higher degree of design freedom than rubber check valves and elastic valve bodies, so that the inner pressures of the liquid chambers 71 and 72 can be increased by adjusting the rigidity and shape. It is possible to change the characteristics. Therefore, tuning is easy and tuning can be performed advantageously.

以上のように、本実施形態の液体封入式筒型防振装置によれば、高減衰特性と低動ばね特性の両立を図りつつ、耐久性に優れ、チューニングを有利に行うことができる液体封入式筒型防振装置を実現することができる。 As described above, according to the liquid-filled cylindrical vibration isolator of the present embodiment, the liquid-filled type can be advantageously tuned with excellent durability while achieving both high damping characteristics and low dynamic spring characteristics. A type cylindrical vibration isolator can be realized.

また、本実施形態の外周筒状部材６０（外筒部材）には、金属板ばね４０、４０の作動部４２、４３の過大な変位を規制するストッパ部６３、６３を有するため、薄肉弾性膜５０、５０の破損等を防止することができ、耐久性の向上を図ることができる。 Further, since the outer peripheral cylindrical member 60 (outer cylindrical member) of the present embodiment has stopper portions 63 and 63 for restricting excessive displacement of the operating portions 42 and 43 of the metal leaf springs 40 and 40, the thin elastic film 50, 50 can be prevented from being damaged, and durability can be improved.

また、本実施形態においては、金属板ばね４０、４０の作動部４２、４３と薄肉弾性膜５０、５０は、全体が接着されているので、作動部４２、４３と薄肉弾性膜５０、５０の摺動部分をなくすことができるので、摺動に弱い材質を使用した場合でも耐久性の向上を図ることができる。 Moreover, in this embodiment, since the operation parts 42 and 43 of the metal leaf springs 40 and 40 and the thin elastic films 50 and 50 are bonded together, the operation parts 42 and 43 and the thin elastic films 50 and 50 are bonded together. Since the sliding portion can be eliminated, durability can be improved even when a material weak to sliding is used.

なお、薄肉弾性膜５０において比較的伸びに弱い材質を使用した場合でも、金属板ばね４０、４０の作動部４２、４３と薄肉弾性膜５０、５０の少なくとも一部を非接着とすることによって、薄肉弾性膜５０、５０が部分的に金属板ばね４０、４０の作動部４２、４３に引っ張られることなく、作動部４２、４３の撓み変形動作に追従することができるので、薄肉弾性膜５０、５０の耐久性の向上を図ることができる。 Even when a material that is relatively weak in elongation is used in the thin elastic film 50, by debonding at least a part of the operating portions 42 and 43 of the metal leaf springs 40 and 40 and the thin elastic films 50 and 50, Since the thin elastic films 50, 50 can follow the bending deformation operation of the operating parts 42, 43 without being partially pulled by the operating parts 42, 43 of the metal leaf springs 40, 40, the thin elastic film 50, The durability of 50 can be improved.

本発明に係る液体封入式筒型防振装置の軸直角方向に沿う断面図であって、図２のＩ−Ｉ線矢視断面図である。FIG. 3 is a cross-sectional view taken along the direction perpendicular to the axis of the liquid-filled cylindrical vibration isolator according to the present invention, and is a cross-sectional view taken along the line II in FIG. 本発明に係る液体封入式筒型防振装置の軸方向に沿う断面図であって、図１のII−II線矢視断面図である。It is sectional drawing in alignment with the axial direction of the liquid filled type | mold vibration isolator which concerns on this invention, Comprising: It is the II-II sectional view taken on the line of FIG. 本発明の液体封入式筒型防振装置における板ばね部材の展開図である。It is an expanded view of the leaf | plate spring member in the liquid enclosure type | formula vibration isolator of this invention. 本発明の液体封入式筒型防振装置における板ばね部材の平面図である。It is a top view of the leaf | plate spring member in the liquid enclosure type | formula vibration isolator of this invention.

符号の説明Explanation of symbols

１０…主軸部材２０…中間筒部材２５、２６…窓部３０…ゴム弾性体３１、３２…凹部４０…金属板ばね４１…支持部４２、４３…作動部４２ａ、４３ａ…湾曲部５０…薄肉弾性膜６０…外周筒状部材６２…作動空間部６３…ストッパ部６４…連通孔７１、７２…液室７３、７４…オリフィス通路 DESCRIPTION OF SYMBOLS 10 ... Main shaft member 20 ... Intermediate | middle cylinder member 25, 26 ... Window part 30 ... Rubber elastic body 31, 32 ... Recess 40 ... Metal leaf spring 41 ... Support part 42, 43 ... Actuation part 42a, 43a ... Curved part 50 ... Thin-walled elasticity Membrane 60 ... Outer cylindrical member 62 ... Working space 63 ... Stopper 64 ... Communication hole 71, 72 ... Liquid chamber 73, 74 ... Orifice passage

Claims

主軸部材と、
該主軸部材の外周側に離間して同軸状に又は偏心して配設された外筒部材と、
前記主軸部材と前記外筒部材との間に介装されて両部材を一体的に連結するゴム弾性体と、
前記主軸部材と前記外筒部材との径方向対向面間に周方向に離間して配設され、少なくとも前記ゴム弾性体と薄肉弾性膜により区画された複数の液室と、
複数の前記液室を互いに連通するオリフィス通路と、
を備え、
前記外筒部材は、
金属板ばね支持部と、
各前記液室の前記薄肉弾性膜に近接するように配置され、各前記液室内の圧力変動により前記金属板ばね支持部に対して撓み変形可能となるように前記金属板ばね支持部に支持される金属板ばね作動部と、
を有することを特徴とする液体封入式筒型防振装置。 A main shaft member;
An outer cylindrical member disposed coaxially or eccentrically apart from the outer peripheral side of the main shaft member;
A rubber elastic body interposed between the main shaft member and the outer cylinder member and integrally connecting the two members;
A plurality of liquid chambers spaced apart in the circumferential direction between radially opposed surfaces of the main shaft member and the outer cylinder member and partitioned by at least the rubber elastic body and a thin elastic film;
An orifice passage communicating the plurality of liquid chambers with each other;
With
The outer cylinder member is
A metal leaf spring support,
Each of the liquid chambers is disposed so as to be close to the thin elastic membrane, and is supported by the metal leaf spring support portion so as to be able to bend and deform with respect to the metal leaf spring support portion due to pressure fluctuation in each liquid chamber. A metal leaf spring operating part,
A liquid-filled cylindrical vibration isolator characterized by comprising:

前記外筒部材は、前記金属板ばね作動部の径方向外方に配置されて前記金属板ばね作動部の過大な変位を規制するストッパ部を有することを特徴とする請求項１に記載の液体封入式筒型防振装置。 2. The liquid according to claim 1, wherein the outer cylinder member has a stopper portion that is disposed radially outward of the metal leaf spring operating portion and restricts excessive displacement of the metal leaf spring operating portion. Enclosed cylindrical vibration isolator.

前記ストッパ部は、前記金属板ばね作動部との間に形成される前記金属板ばね作動部の作動空間部と大気空間とを連通する連通孔を有することを特徴とする請求項２に記載の液体封入式筒型防振装置。 The said stopper part has a communicating hole which connects the working space part of the said metal leaf | plate spring action | operation part and atmospheric space formed between the said metal leaf | plate spring action | operation parts. Liquid-filled cylindrical vibration isolator.

前記金属板ばね作動部と前記薄肉弾性膜は、少なくとも一部が接着されていることを特徴とする請求項１〜３の何れか一項に記載の液体封入式筒型防振装置。 The liquid-filled cylindrical vibration isolator according to any one of claims 1 to 3, wherein at least a part of the metal plate spring operating part and the thin elastic film are bonded.

前記薄肉弾性膜は、前記金属板ばね作動部の径方向内方に重なり合うように配置され、
前記金属板ばね作動部と前記薄肉弾性膜は、少なくとも一部が非接着とされていることを特徴とする請求項１〜３の何れか一項に記載の液体封入式筒型防振装置。 The thin elastic film is disposed so as to overlap the inner side in the radial direction of the metal leaf spring operating part,
The liquid-filled cylindrical vibration isolator according to any one of claims 1 to 3, wherein at least a part of the metal leaf spring operating part and the thin elastic film are not bonded.

前記外筒部材は、前記金属板ばね支持部及び前記金属板ばね作動部を備えた内周筒状部材と該内周筒状部の外周側に装着された外周筒状部材を有することを特徴とする請求項１〜５の何れか一項に記載の液体封入式筒型防振装置。 The outer cylindrical member includes an inner peripheral cylindrical member provided with the metal leaf spring support portion and the metal leaf spring operating portion, and an outer peripheral cylindrical member mounted on the outer peripheral side of the inner peripheral cylindrical portion. The liquid-filled cylindrical vibration isolator according to any one of claims 1 to 5.

前記外筒部材と前記ゴム弾性体の間には、前記薄肉弾性膜と対応する位置に設けられた複数の窓部を有する中間筒部材を有することを特徴とする請求項１〜６の何れか一項に記載の液体封入式筒型防振装置。 The intermediate cylinder member having a plurality of window portions provided at positions corresponding to the thin elastic film is provided between the outer cylinder member and the rubber elastic body. The liquid-filled cylindrical vibration isolator according to one item.