JP2019158138A - Anti-vibration device - Google Patents

Anti-vibration device Download PDF

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JP2019158138A
JP2019158138A JP2018136125A JP2018136125A JP2019158138A JP 2019158138 A JP2019158138 A JP 2019158138A JP 2018136125 A JP2018136125 A JP 2018136125A JP 2018136125 A JP2018136125 A JP 2018136125A JP 2019158138 A JP2019158138 A JP 2019158138A
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elastic body
rubber elastic
main rubber
mounting member
recess
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JP7102273B2 (en
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直基 古町
Naomoto Furumachi
直基 古町
恭宣 安田
Yasunobu Yasuda
恭宣 安田
市川　浩幸
Hiroyuki Ichikawa
浩幸 市川
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Sumitomo Riko Co Ltd
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Sumitomo Riko Co Ltd
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Priority to US16/168,979 priority Critical patent/US10794446B2/en
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Abstract

To provide an anti-vibration device having a new structure which can improve durability by softening stress concentration in a small-diameter part of a body rubber elastic body while securing a larger degree of tuning freedom of spring property.SOLUTION: An upper part of a body rubber elastic body 16 is a small-diameter part 40, a lower part of the body rubber elastic body 16 is a large-diameter part 42, a first fitting member 12 is fastened to the small-diameter part 40, and a second fitting member 14 is fastened to the large-diameter part 42. On the other hand, an inner recess 24 opening in an outer peripheral surface is formed in the first fitting member 12, the small-diameter part 40 of the body rubber elastic body 16 is fastened to the recess 24, an external diameter of the body rubber elastic body 16 in a part fastened to the inner recess 24 is larger compared to an external diameter of the first fitting member 12 below the inner recess 24, and the small-diameter part 40 of the body rubber elastic body 16 is fastened to the inner recess 24 so as to be thickened.SELECTED DRAWING: Figure 1

Description

本発明は、例えば自動車のエンジンマウントなどに適用され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, an engine mount of an automobile.

従来から、パワーユニットと車両ボデーを防振連結するエンジンマウントなどに適用される防振装置が知られている。防振装置は、例えば特開２０１６−０６５５５６号公報（特許文献１）に開示された液封入式防振装置のように、振動伝達系構成部材の各一方に取り付けられる第一の取付部材としての内筒と第二の取付部材としての外筒の間が、本体ゴム弾性体としての脚基体で連結された構造を有している。そして、内筒と外筒の間に軸方向の振動が入力されると、脚基体の弾性変形によって防振性能が発揮されるようになっている。   2. Description of the Related Art Conventionally, an anti-vibration device that is applied to an engine mount that anti-vibrates and connects a power unit and a vehicle body is known. The vibration isolator is a first mounting member that is attached to each one of the vibration transmission system constituent members, such as a liquid-filled vibration isolator disclosed in, for example, JP-A-2006-065556 (Patent Document 1). The inner cylinder and the outer cylinder as the second mounting member are connected by a leg base body as a main rubber elastic body. And if the vibration of an axial direction is input between an inner cylinder and an outer cylinder, the anti-vibration performance will be exhibited by the elastic deformation of a leg base | substrate.

ところで、特許文献１の脚基体は、軸方向上部が下部よりも小径とされたテーパ形状とされていることから、内筒と外筒の間に軸方向の荷重が入力されると、小径とされた軸方向上部に応力が集中し易く、皺状の変形や亀裂などが軸方向上部において発生するおそれがあった。   By the way, since the leg base of Patent Document 1 has a tapered shape in which the upper part in the axial direction has a smaller diameter than the lower part, when an axial load is input between the inner cylinder and the outer cylinder, As a result, stress tends to concentrate on the upper part in the axial direction, and there is a possibility that wrinkle-like deformation or cracks may occur in the upper part in the axial direction.

そこで、特許文献１では、内筒の外周面に開口する内筒凹部が、内筒において脚基体の上端部が固着される部分に設けられていると共に、内筒凹部に対応する連結部凹部が脚基体の上部において外周面に開口するように形成されており、脚基体の上端部は、内筒凹部の上下壁面を構成する内筒の第１突出部と第２突出部の間に配されていることで、軸方向荷重の入力時にほとんど変形しない構造とされている。   Therefore, in Patent Document 1, an inner cylinder recess opening in the outer peripheral surface of the inner cylinder is provided in a portion where the upper end portion of the leg base is fixed in the inner cylinder, and a connecting portion recess corresponding to the inner cylinder recess is provided. The upper end of the leg base is formed so as to open to the outer peripheral surface, and the upper end of the leg base is arranged between the first projecting portion and the second projecting portion of the inner cylinder constituting the upper and lower wall surfaces of the inner cylinder recess. As a result, the structure is hardly deformed when an axial load is input.

しかしながら、特許文献１の構造では、第１突出部から脚基体への軸方向入力の伝達が連結部凹部の形成によって大幅に低減されることから、脚基体において剪断ばね成分が支配的となって圧縮ばね成分が小さくなることで、ばね特性のチューニング自由度が低下するおそれがあった。   However, in the structure of Patent Document 1, since the transmission of the axial input from the first protrusion to the leg base is significantly reduced by the formation of the coupling recess, the shear spring component is dominant in the leg base. As the compression spring component is reduced, the degree of freedom in tuning the spring characteristics may be reduced.

特開２０１６−０６５５５６号公報Japanese Patent Laid-Open No. 2006-065556

本発明は、上述の事情を背景に為されたものであって、その解決課題は、ばね特性のチューニング自由度を大きく得ながら、本体ゴム弾性体の小径部分における応力集中を緩和して耐久性の向上を図ることができる、新規な構造の防振装置を提供することにある。   The present invention has been made in the background of the above-mentioned circumstances, and its solution is to reduce the stress concentration in the small-diameter portion of the main rubber elastic body while obtaining a large degree of freedom in tuning the spring characteristics, and to improve durability. An object of the present invention is to provide a vibration isolator having a novel structure capable of improving the above.

以下、このような課題を解決するために為された本発明の態様を記載する。なお、以下に記載の各態様において採用される構成要素は、可能な限り任意の組み合わせで採用可能である。   Hereinafter, the aspect of this invention made | formed in order to solve such a subject is described. In addition, the component employ | adopted in each aspect as described below is employable by arbitrary combinations as much as possible.

すなわち、本発明の第一の態様は、第一の取付部材と第二の取付部材が本体ゴム弾性体によって弾性連結されている防振装置において、前記本体ゴム弾性体の上部が小径部分とされていると共に、該本体ゴム弾性体の下部が大径部分とされて、該本体ゴム弾性体の該小径部分に前記第一の取付部材が固着されていると共に、該本体ゴム弾性体の該大径部分に前記第二の取付部材が固着されている一方、該第一の取付部材には外周面に開口するインナ凹部が形成されて、該本体ゴム弾性体の該小径部分が該インナ凹部に固着されていると共に、該インナ凹部に固着された部分における該本体ゴム弾性体の外径寸法が該インナ凹部よりも下側における該第一の取付部材の外径寸法に比して大きくされており、該本体ゴム弾性体の該小径部分が該インナ凹部に固着されることで厚肉化されていることを、特徴とする。   In other words, according to a first aspect of the present invention, in the vibration isolator in which the first attachment member and the second attachment member are elastically connected by the main rubber elastic body, the upper portion of the main rubber elastic body is a small diameter portion. And the lower portion of the main rubber elastic body is a large diameter portion, the first attachment member is fixed to the small diameter portion of the main rubber elastic body, and the main rubber elastic body is While the second mounting member is fixed to the diameter portion, the first mounting member is formed with an inner recess opening on the outer peripheral surface, and the small-diameter portion of the main rubber elastic body is formed in the inner recess. The outer diameter of the main rubber elastic body at the portion fixed to the inner recess is made larger than the outer diameter of the first mounting member below the inner recess. The small diameter portion of the main rubber elastic body is That it is thickened by being secured to the burner recess, it characterized.

このような第一の態様に従う構造とされた防振装置によれば、本体ゴム弾性体の弾性変形に際して応力が集中し易い小径部分において、第一の取付部材にインナ凹部が形成されていることで厚さ寸法が大きく確保されており、小径部分において応力の分散化が図られることによって、本体ゴム弾性体の耐久性の向上が図られる。   According to the vibration isolator having the structure according to the first aspect as described above, the inner mounting recess is formed in the first mounting member in the small-diameter portion where stress tends to concentrate when the main rubber elastic body is elastically deformed. Thus, the thickness of the main rubber elastic body is improved by dispersing the stress in the small diameter portion.

しかも、本体ゴム弾性体におけるインナ凹部への固着部分は、インナ凹部に全体が入り込んで配されることなく、第一の取付部材におけるインナ凹部よりも下側部分に対して外周に突出していることから、上下方向の振動入力に対して弾性変形が生じ易くなっている。それ故、本体ゴム弾性体の実質的な厚さがインナ凹部によって大きくされていると共に、第一の取付部材から下向きの力が入力される際に、本体ゴム弾性体の圧縮ばね成分を得易く、本体ゴム弾性体においてばね特性のチューニング自由度を大きく得ることができる。   Moreover, the fixed portion of the main rubber elastic body to the inner concave portion protrudes to the outer periphery with respect to the lower portion than the inner concave portion of the first mounting member without being entirely arranged in the inner concave portion. Therefore, elastic deformation is likely to occur with respect to vertical vibration input. Therefore, the substantial thickness of the main rubber elastic body is increased by the inner recess, and when a downward force is input from the first mounting member, it is easy to obtain the compression spring component of the main rubber elastic body. In the main rubber elastic body, a large degree of freedom in tuning the spring characteristics can be obtained.

本発明の第二の態様は、第一の態様に記載された防振装置において、前記インナ凹部の内面は深さ寸法が最大となる最深部から上下両側に向けて外周へ傾斜するテーパ形状を有しているものである。   According to a second aspect of the present invention, in the vibration isolator described in the first aspect, the inner surface of the inner concave portion has a tapered shape that inclines toward the outer periphery from the deepest portion where the depth dimension is maximum toward both upper and lower sides. It is what you have.

第二の態様によれば、インナ凹部の上下幅寸法が開口に向けて大きくなっていることから、インナ凹部内の本体ゴム弾性体が振動入力時に変形し易く、インナ凹部の形成による応力の分散化がより有利に実現される。また、第一の取付部材におけるインナ凹部の内面から本体ゴム弾性体へ下向きの力が効率的に伝達されて、本体ゴム弾性体の圧縮ばね成分を有効に得ることができることから、本体ゴム弾性体のばね特性を大きな自由度でチューニングすることができる。   According to the second aspect, since the vertical width dimension of the inner concave portion is increased toward the opening, the main rubber elastic body in the inner concave portion is easily deformed at the time of vibration input, and stress is dispersed by the formation of the inner concave portion. Can be realized more advantageously. Further, since the downward force is efficiently transmitted from the inner surface of the inner concave portion of the first mounting member to the main rubber elastic body, the compression spring component of the main rubber elastic body can be effectively obtained. Can be tuned with a large degree of freedom.

本発明の第三の態様は、第二の態様に記載された防振装置において、前記インナ凹部の最深部の内面が外周へ向けて凹となる湾曲面とされているものである。   According to a third aspect of the present invention, in the vibration isolator described in the second aspect, the innermost surface of the inner concave portion is a curved surface that is concave toward the outer periphery.

第三の態様によれば、インナ凹部の最深部の内面が湾曲面とされていることで、インナ凹部において最深部を含む深さ寸法の大きな部分が、上下方向で広い領域に亘って設定されて、本体ゴム弾性体の厚肉化による耐久性の向上が有利に実現され得る。しかも、インナ凹部の内面が最深部において角をなさない形状とされていることにより、本体ゴム弾性体におけるインナ凹部の最深部への固着部分において、応力の分散化による耐久性の向上などが図られる。   According to the third aspect, since the inner surface of the deepest portion of the inner concave portion is a curved surface, a portion having a large depth dimension including the deepest portion in the inner concave portion is set over a wide region in the vertical direction. Thus, the durability can be advantageously improved by increasing the thickness of the main rubber elastic body. Moreover, since the inner surface of the inner recess has a shape that does not form a corner at the deepest portion, the durability of the main rubber elastic body can be improved by dispersing the stress at the deepest portion of the inner recess. It is done.

本発明の第四の態様は、第一〜第三の何れか１つの態様に記載された防振装置において、前記本体ゴム弾性体の前記小径部分の外周面が外周に向けて凹となる凹状湾曲面を有しており、該凹状湾曲面の最深部よりも該インナ凹部の最深部が下側に位置しているものである。   According to a fourth aspect of the present invention, in the vibration isolator described in any one of the first to third aspects, the outer peripheral surface of the small diameter portion of the main rubber elastic body is concave toward the outer periphery. It has a curved surface, and the deepest portion of the inner concave portion is located below the deepest portion of the concave curved surface.

第四の態様によれば、本体ゴム弾性体の外周面が凹状湾曲面を有していることで、本体ゴム弾性体の外周面において自由表面が大きく確保されており、本体ゴム弾性体の耐久性の向上が図られる。しかも、万が一、凹状湾曲面の最深部付近で本体ゴム弾性体に亀裂が生じたとしても、亀裂の伸展がインナ凹部の内面によって抑制され易く、信頼性の向上が図られ得る。特に、流体封入式防振装置では、流体封入領域の壁部を構成する本体ゴム弾性体の大径部分まで亀裂が進展するのを防ぐことで、流体の漏れを防止することができて、目的とする防振性能が維持され易くなる。   According to the fourth aspect, since the outer peripheral surface of the main rubber elastic body has a concave curved surface, a large free surface is secured on the outer peripheral surface of the main rubber elastic body, and the durability of the main rubber elastic body The improvement of the property is achieved. Moreover, even if a crack occurs in the main rubber elastic body in the vicinity of the deepest portion of the concave curved surface, the extension of the crack is easily suppressed by the inner surface of the inner concave portion, and the reliability can be improved. In particular, in the fluid-filled vibration isolator, the leakage of fluid can be prevented by preventing the crack from progressing to the large-diameter portion of the main rubber elastic body constituting the wall portion of the fluid-filled region. The anti-vibration performance is easily maintained.

本発明の第五の態様は、第一〜第四の何れか１つの態様に記載された防振装置において、前記第一の取付部材の下面が前記本体ゴム弾性体の前記大径部分によって覆われているものである。   According to a fifth aspect of the present invention, in the vibration isolator described in any one of the first to fourth aspects, the lower surface of the first mounting member is covered with the large-diameter portion of the main rubber elastic body. It is what has been broken.

第五の態様によれば、本体ゴム弾性体の自由表面が大きく確保されることで、本体ゴム弾性体の耐久性の向上が図られ得る。更に、例えば、流体封入式防振装置において、第一の取付部材が流体封入領域に露出するのを防ぐことで、第一の取付部材の侵食などを防いで耐久性の向上が図られる。   According to the fifth aspect, it is possible to improve the durability of the main rubber elastic body by ensuring a large free surface of the main rubber elastic body. Further, for example, in the fluid-filled vibration isolator, by preventing the first mounting member from being exposed to the fluid-filled region, the first mounting member is prevented from being eroded and the durability is improved.

本発明の第六の態様は、第一〜第五の何れか１つの態様に記載された防振装置において、前記インナ凹部が前記第一の取付部材の全周に亘って連続して設けられているものである。   According to a sixth aspect of the present invention, in the vibration isolator described in any one of the first to fifth aspects, the inner recess is continuously provided over the entire circumference of the first mounting member. It is what.

第六の態様によれば、本体ゴム弾性体の小径部分がインナ凹部によって全周に亘って厚肉化されることから、本体ゴム弾性体の小径部分に作用する応力が全周に亘って緩和されて、耐久性の向上がより有利に図られる。特に、インナ凹部を周方向で略一定の断面形状とすれば、応力集中を防ぐことができて、耐久性をより有利に確保できる。   According to the sixth aspect, the small diameter portion of the main rubber elastic body is thickened over the entire circumference by the inner recess, so that the stress acting on the small diameter portion of the main rubber elastic body is alleviated over the entire circumference. Thus, the durability can be improved more advantageously. In particular, if the inner recess has a substantially constant cross-sectional shape in the circumferential direction, stress concentration can be prevented, and durability can be secured more advantageously.

本発明の第七の態様は、第一〜第六の何れか１つの態様に記載された防振装置において、前記第一の取付部材において外周へ突出する突出部が前記インナ凹部よりも上側に設けられているものである。   According to a seventh aspect of the present invention, in the vibration isolator described in any one of the first to sixth aspects, the protruding portion that protrudes to the outer periphery of the first mounting member is above the inner concave portion. It is provided.

第七の態様によれば、突出部に本体ゴム弾性体の上端部分が固着されることによって、本体ゴム弾性体の第一の取付部材に対する固着面積が大きく確保される。また、第一の取付部材の突出部から本体ゴム弾性体の上端部分へ下向きの力が及ぼされることによって、本体ゴム弾性体において圧縮ばね成分がより大きくなることから、本体ゴム弾性体のばね特性をより大きな自由度でチューニングすることができる。   According to the seventh aspect, by fixing the upper end portion of the main rubber elastic body to the protrusion, a large fixing area of the main rubber elastic body to the first mounting member is ensured. Further, since a downward force is exerted from the protruding portion of the first mounting member to the upper end portion of the main rubber elastic body, the compression spring component becomes larger in the main rubber elastic body, so that the spring characteristics of the main rubber elastic body Can be tuned with a greater degree of freedom.

本発明の第八の態様は、第一〜第七の何れか１つの態様に記載された防振装置において、前記第一の取付部材には、前記インナ凹部よりも軸方向下方において外周面に開口して周方向に延びる周溝状凹部が設けられており、該周溝状凹部の外周面と前記第二の取付部材の内周面との対向面間が前記本体ゴム弾性体で連結されているものである。   According to an eighth aspect of the present invention, in the vibration isolator described in any one of the first to seventh aspects, the first attachment member has an outer peripheral surface on an axially lower side than the inner recess. A circumferential groove-shaped recess is provided that opens and extends in the circumferential direction, and the opposing surface between the outer circumferential surface of the circumferential groove-shaped recess and the inner circumferential surface of the second mounting member is connected by the main rubber elastic body. It is what.

第八の態様によれば、第一の取付部材に周溝状凹部が設けられていることで、軸方向に対して傾斜する方向において、本体ゴム弾性体の自由長を大きく確保することが可能となって、傾斜方向の入力に対する本体ゴム弾性体の耐久性の向上が図られる。しかも、周溝状凹部が第一の取付部材の軸方向中間部分に形成されていることから、第一の取付部材の下端面の軸方向投影面積を大きく得ることができる。それ故、例えば、壁部の一部が本体ゴム弾性体で構成されて非圧縮性流体が封入された受圧室が、本体ゴム弾性体の下側に形成された流体封入式防振装置に本態様を適用すれば、上下方向乃至は傾斜方向の入力に対して受圧室の圧力変動を大きく得ることも可能になる。   According to the eighth aspect, since the circumferential groove-shaped recess is provided in the first mounting member, it is possible to ensure a large free length of the main rubber elastic body in the direction inclined with respect to the axial direction. Thus, the durability of the main rubber elastic body against the input in the tilt direction is improved. And since the circumferential groove-shaped recessed part is formed in the axial direction intermediate part of the 1st attachment member, the axial direction projection area of the lower end surface of a 1st attachment member can be acquired largely. Therefore, for example, a pressure receiving chamber in which a part of the wall portion is formed of a main rubber elastic body and in which an incompressible fluid is sealed is provided in a fluid-filled vibration isolator formed on the lower side of the main rubber elastic body. By applying the aspect, it becomes possible to obtain a large pressure fluctuation in the pressure receiving chamber with respect to the input in the up-down direction or the inclination direction.

本発明の第九の態様は、第一〜第八の何れか１つの態様に記載された防振装置において、前記本体ゴム弾性体の前記大径部分の軸方向外方には、該本体ゴム弾性体で壁部の一部が構成されて非圧縮性流体が封入されることにより、振動入力時に圧力変動が生ぜしめられる受圧室が形成されているものである。   According to a ninth aspect of the present invention, in the vibration isolator described in any one of the first to eighth aspects, the main body rubber is disposed outwardly in the axial direction of the large-diameter portion of the main rubber elastic body. By forming a part of the wall portion with an elastic body and enclosing an incompressible fluid, a pressure receiving chamber is formed in which pressure fluctuations are generated at the time of vibration input.

第九の態様によれば、応力集中の緩和によって本体ゴム弾性体の耐久性の低下を回避しつつ、第一の取付部材の軸方向投影面積の確保によって、有効ピストン面積乃至は拡張ばねを大きく得ることができる。さらに、第八の態様と組み合わせて採用すれば、第一の取付部材の軸方向投影面積を確保しながら、本体ゴム弾性体の有効自由長を傾斜方向で長く得ることができて、傾斜方向の入力に対する本体ゴム弾性体の耐久性の向上も図られる。   According to the ninth aspect, the effective piston area or the expansion spring is increased by securing the axial projection area of the first mounting member while avoiding the deterioration of the durability of the main rubber elastic body by relaxing the stress concentration. Obtainable. Furthermore, if employed in combination with the eighth aspect, the effective free length of the main rubber elastic body can be obtained long in the tilt direction while ensuring the axial projection area of the first mounting member, and the tilt direction The durability of the main rubber elastic body against input can be improved.

本発明の第十の態様は、第九の態様に記載された防振装置において、前記第一の取付部材において、前記本体ゴム弾性体の小径側端部から軸方向内方に入り込んだ軸方向下方の端面が、軸直角方向に広がる平坦部を中央部分に有していると共に、該平坦部の外周が滑らかに湾曲して該第一の取付部材の外周面につながった外周面取り形状とされているものである。   According to a tenth aspect of the present invention, in the vibration isolator described in the ninth aspect, in the first attachment member, an axial direction that enters inward in the axial direction from a small-diameter side end of the main rubber elastic body. The lower end surface has a flat portion extending in the direction perpendicular to the axis at the center portion, and the outer periphery of the flat portion is smoothly curved and connected to the outer peripheral surface of the first mounting member. It is what.

第十の態様によれば、第一の取付部材の下端面に平坦部が設けられていることで、上下方向の振動入力に対して、受圧室の内圧が効率的に変動せしめられて、例えば、流体の流動作用による防振効果などを有利に得ることができる。さらに、平坦部の外周が滑らかに湾曲する外周面取り形状とされて、第一の取付部材の下端面と外周面が滑らかに連続していることにより、下端面と外周面のつなぎ部分に固着された本体ゴム弾性体の応力集中が緩和されて、本体ゴム弾性体の耐久性の向上が図られる。   According to the tenth aspect, since the flat portion is provided on the lower end surface of the first mounting member, the internal pressure of the pressure receiving chamber can be efficiently varied with respect to the vibration input in the vertical direction, for example, In addition, it is possible to advantageously obtain an anti-vibration effect by the fluid flow action. Furthermore, the outer periphery of the flat part is formed into an outer peripheral chamfered shape that is smoothly curved, and the lower end surface and the outer peripheral surface of the first mounting member are smoothly connected to each other, so that the lower end surface and the outer peripheral surface are bonded to each other. The stress concentration of the main rubber elastic body is relieved, and the durability of the main rubber elastic body is improved.

本発明によれば、第一の取付部材の外周面に開口するインナ凹部が形成されていると共に、本体ゴム弾性体の小径部分がインナ凹部に固着されていることから、本体ゴム弾性体の弾性変形に際して応力が集中し易い小径部分の厚さ寸法がインナ凹部によって大きく確保されており、本体ゴム弾性体の耐久性の向上が図られる。更に、本体ゴム弾性体におけるインナ凹部への固着部分が、第一の取付部材におけるインナ凹部よりも下側部分に対して外周に突出しており、上下方向の振動入力に対して弾性変形が生じるようになっていることから、第一の取付部材から下向きの力が入力される際に、本体ゴム弾性体の圧縮ばね成分を得易く、本体ゴム弾性体においてばね特性のチューニング自由度を大きく得ることができる。   According to the present invention, the inner concave portion that is opened on the outer peripheral surface of the first mounting member is formed, and the small diameter portion of the main rubber elastic body is fixed to the inner concave portion. The thickness of the small-diameter portion where stress tends to concentrate during deformation is largely secured by the inner concave portion, and the durability of the main rubber elastic body can be improved. Further, the fixed portion of the main rubber elastic body to the inner concave portion protrudes to the outer periphery with respect to the lower portion of the first mounting member relative to the inner concave portion, so that elastic deformation occurs with respect to the vibration input in the vertical direction. Therefore, when a downward force is input from the first mounting member, it is easy to obtain the compression spring component of the main rubber elastic body, and to obtain a large degree of freedom in tuning the spring characteristics in the main rubber elastic body. Can do.

本発明の第一の実施形態としてのエンジンマウントを示す縦断面図。The longitudinal cross-sectional view which shows the engine mount as 1st embodiment of this invention. 本発明の第二の実施形態としてのエンジンマウントを示す縦断面図。The longitudinal cross-sectional view which shows the engine mount as 2nd embodiment of this invention. 図２に示すエンジンマウントを構成する第一の取付部材の斜視図。The perspective view of the 1st attachment member which comprises the engine mount shown in FIG. 本発明の別の一実施形態としてのエンジンマウントを構成する第一の取付部材の斜視図。The perspective view of the 1st attachment member which comprises the engine mount as another one Embodiment of this invention. 図４に示す第一の取付部材の横断面図。The cross-sectional view of the 1st attachment member shown in FIG.

以下、本発明の実施形態について、図面を参照しつつ説明する。   Embodiments of the present invention will be described below with reference to the drawings.

図１には、本発明に従う構造とされた防振装置の第一の実施形態として、自動車用のエンジンマウント１０が示されている。エンジンマウント１０は、第一の取付部材１２と第二の取付部材１４が本体ゴム弾性体１６によって相互に弾性連結された構造を有している。なお、以下の説明において、上下方向とは、マウント中心軸方向であり、主たる振動の入力方向でもある図１中の上下方向を言う。   FIG. 1 shows an automotive engine mount 10 as a first embodiment of a vibration isolator having a structure according to the present invention. The engine mount 10 has a structure in which a first mounting member 12 and a second mounting member 14 are elastically connected to each other by a main rubber elastic body 16. In the following description, the vertical direction refers to the vertical direction in FIG. 1 which is the mount central axis direction and is also the main vibration input direction.

より詳細には、第一の取付部材１２は、金属などで形成された高剛性の部材であって、小径の略円柱形状を呈する本体部１８と、本体部１８の上端部において外周へ突出する突出部としてのフランジ状部２０とを、一体的に備えている。また、本体部１８には、中心軸上を上下方向に延びて上面に開口するねじ穴２２が形成されている。さらに、第一の取付部材１２の本体部１８の下端面２３は、中央部分が軸直角方向に広がる略円形の平坦部２３ａとされていると共に、平坦部２３ａの外周が、滑らかに湾曲して本体部１８の外周面につながる外周面取り形状を有する環状の湾曲部２３ｂとされている。   More specifically, the first mounting member 12 is a high-rigidity member formed of metal or the like, and projects to the outer periphery at the main body portion 18 having a small-diameter, generally cylindrical shape, and the upper end portion of the main body portion 18. A flange-like portion 20 as a protruding portion is integrally provided. The main body 18 is formed with a screw hole 22 that extends in the vertical direction on the central axis and opens on the upper surface. Further, the lower end surface 23 of the main body portion 18 of the first mounting member 12 is a substantially circular flat portion 23a whose central portion extends in the direction perpendicular to the axis, and the outer periphery of the flat portion 23a is smoothly curved. An annular curved portion 23 b having an outer peripheral chamfered shape connected to the outer peripheral surface of the main body portion 18 is formed.

さらに、第一の取付部材１２の本体部１８には、外周面に開口するインナ凹部２４が形成されている。インナ凹部２４は、本体部１８の上部に形成されており、本実施形態では全周に亘って連続する凹溝状とされている。更に、インナ凹部２４は、軸方向の断面形状（縦断面形状）において、最も深さ寸法の大きい最深部２６が上下中間部分に位置していると共に、最深部２６から上下外側に向けて外周へ傾斜するテーパ形状の内面を有しており、最深部２６から上下に離れるに従って深さ寸法が徐々に小さくなっている。なお、最深部２６は、インナ凹部２４の内面において、軸直角方向でマウント中心軸（図１中の一点鎖線）に最も接近する点を言う。   Furthermore, an inner recess 24 that opens to the outer peripheral surface is formed in the main body 18 of the first mounting member 12. The inner recessed part 24 is formed in the upper part of the main-body part 18, and is made into the groove shape continuous over the perimeter in this embodiment. Further, the inner recess 24 has an axial cross-sectional shape (longitudinal cross-sectional shape) in which the deepest portion 26 having the largest depth dimension is positioned at the upper and lower intermediate portions, and from the deepest portion 26 to the outer periphery upward and downward. The inner surface has an inclined tapered shape, and the depth dimension gradually decreases as the distance from the deepest portion 26 increases and decreases. The deepest portion 26 refers to a point on the inner surface of the inner concave portion 24 that is closest to the mount center axis (a chain line in FIG. 1) in a direction perpendicular to the axis.

より具体的には、本実施形態のインナ凹部２４の内面は、最深部２６を含む上下中間部分が縦断面において略円弧状をなす湾曲面２８とされていると共に、円弧状湾曲面２８の接線方向に延びるテーパ面３０，３２が円弧状湾曲面２８の上下両端と連続して設けられて構成されている。更に、上側のテーパ面３０は、上側に向けて外周へ傾斜しており、上端がフランジ状部２０の下面に滑らかに繋がっていると共に、下側のテーパ面３２は、下側に向けて外周へ傾斜していると共に、下端がインナ凹部２４を外れた本体部１８の外周面に滑らかに繋がっている。なお、上記からも分かるように、フランジ状部２０は、インナ凹部２４よりも上側に設けられている。   More specifically, the inner surface of the inner recess 24 of the present embodiment is a curved surface 28 in which the upper and lower intermediate portions including the deepest portion 26 form a substantially arc shape in the longitudinal section, and the tangent line of the arc-shaped curved surface 28 Tapered surfaces 30, 32 extending in the direction are provided continuously with the upper and lower ends of the arcuate curved surface 28. Further, the upper tapered surface 30 is inclined to the outer periphery toward the upper side, the upper end is smoothly connected to the lower surface of the flange-shaped portion 20, and the lower tapered surface 32 is the outer periphery toward the lower side. The lower end of the main body 18 is smoothly connected to the outer peripheral surface of the main body 18 that is out of the inner recess 24. As can be seen from the above, the flange-shaped portion 20 is provided above the inner concave portion 24.

さらに、本実施形態のインナ凹部２４は、上下方向の最大幅寸法が第一の取付部材１２の本体部１８の上下寸法に対して１／４倍〜１／２倍であることが望ましい。更にまた、インナ凹部２４は、好適には最深部２６が本体部１８の上下方向中央よりも上側に位置している。更に、インナ凹部２４は、径方向の深さが上下方向の幅よりも小さくされており、上下方向の最大幅寸法に対する径方向の最大深さ寸法の比が、好適には１／２〜１／４とされる。   Further, the inner recess 24 of the present embodiment desirably has a maximum vertical dimension of 1/4 to 1/2 times the vertical dimension of the main body 18 of the first mounting member 12. Furthermore, in the inner concave portion 24, the deepest portion 26 is preferably located above the center of the main body portion 18 in the vertical direction. Further, the inner recess 24 has a radial depth smaller than the vertical width, and the ratio of the maximum radial depth to the maximum vertical width is preferably 1/2 to 1. / 4.

更にまた、インナ凹部２４の内面を構成する上側のテーパ面３０は、上下方向に対する傾斜角度が２０°〜７０°であることが望ましい。一方、インナ凹部２４の内面を構成する下側のテーパ面３２は、上下方向に対する傾斜角度が２０°〜７０°であることが望ましく、本実施形態では対応する本体ゴム弾性体１６の外周面と略同じ角度で傾斜している。なお、本実施形態の上下のテーパ面３０，３２は、縦断面において略直線的に延びており、上下方向に対する傾斜角度が全体に亘って略一定とされているが、例えば、上下のテーパ面は、縦断面において湾曲面とされて、上下方向に対する傾斜角度が変化していても良い。   Furthermore, it is desirable that the upper tapered surface 30 constituting the inner surface of the inner recess 24 has an inclination angle with respect to the vertical direction of 20 ° to 70 °. On the other hand, it is desirable that the lower tapered surface 32 constituting the inner surface of the inner concave portion 24 has an inclination angle of 20 ° to 70 ° with respect to the vertical direction. In this embodiment, the lower tapered surface 32 and the corresponding outer peripheral surface of the main rubber elastic body 16 It is inclined at substantially the same angle. Note that the upper and lower tapered surfaces 30 and 32 of the present embodiment extend substantially linearly in the longitudinal section, and the inclination angle with respect to the vertical direction is substantially constant throughout, but for example, the upper and lower tapered surfaces May be a curved surface in the longitudinal section, and the inclination angle with respect to the vertical direction may be changed.

第二の取付部材１４は、第一の取付部材１２と同様に金属などで形成されて、薄肉大径の略円筒形状を有しており、上下方向の中間部分に段差部３４が設けられて、段差部３４よりも上側が大径筒部３６とされていると共に、段差部３４よりも下側が小径筒部３８とされている。   The second mounting member 14 is formed of metal or the like, similar to the first mounting member 12, has a thin-walled, large-diameter, generally cylindrical shape, and a step 34 is provided at an intermediate portion in the vertical direction. The upper side of the step part 34 is a large diameter cylindrical part 36 and the lower side of the step part 34 is a small diameter cylindrical part 38.

そして、第一の取付部材１２と第二の取付部材１４は、略同一中心軸上に配されて、本体ゴム弾性体１６によって相互に弾性連結されている。本体ゴム弾性体１６は、上部が小径部分４０とされるとともに下部が大径部分４２とされた略円錐台形状を有しており、第一の取付部材１２における本体部１８の表面とフランジ状部２０の下面とが本体ゴム弾性体１６の小径部分４０に加硫接着されていると共に、第二の取付部材１４の内周面が本体ゴム弾性体１６の大径部分４２の外周面に加硫接着されている。本実施形態の本体ゴム弾性体１６は、第一の取付部材１２と第二の取付部材１４を備える一体加硫成形品として形成されている。   The first mounting member 12 and the second mounting member 14 are arranged on substantially the same central axis and are elastically connected to each other by the main rubber elastic body 16. The main rubber elastic body 16 has a substantially truncated cone shape in which the upper portion is a small diameter portion 40 and the lower portion is a large diameter portion 42, and the surface of the main body portion 18 in the first mounting member 12 and a flange shape. The lower surface of the portion 20 is vulcanized and bonded to the small diameter portion 40 of the main rubber elastic body 16, and the inner peripheral surface of the second mounting member 14 is added to the outer peripheral surface of the large diameter portion 42 of the main rubber elastic body 16. Sulfur bonded. The main rubber elastic body 16 of the present embodiment is formed as an integrally vulcanized molded product including the first mounting member 12 and the second mounting member 14.

なお、本体ゴム弾性体１６は、第二の取付部材１４が固着されている部分が大径側端部を含む大径部分４２とされていると共に、大径部分４２よりも上側に位置して大径部分４２よりも小径とされた部分が小径側端部を含む小径部分４０とされており、本実施形態では、軸方向の断面形状において、小径部分４０が略円錐台形状を有していると共に、大径部分４２が略円柱形状を有している。また、第一の取付部材１２は、少なくとも小径部分４０に固着されていれば、大径部分４２には固着されていても良いし、固着されていなくても良い。   The main rubber elastic body 16 is configured such that the portion to which the second mounting member 14 is fixed is a large-diameter portion 42 including the large-diameter side end portion, and is positioned above the large-diameter portion 42. A portion having a smaller diameter than the large-diameter portion 42 is a small-diameter portion 40 including a small-diameter side end portion. In this embodiment, the small-diameter portion 40 has a substantially truncated cone shape in the axial cross-sectional shape. In addition, the large-diameter portion 42 has a substantially cylindrical shape. Further, as long as the first mounting member 12 is fixed to at least the small-diameter portion 40, it may be fixed to the large-diameter portion 42 or may not be fixed.

本実施形態では、第一の取付部材１２が、本体ゴム弾性体１６の小径側端面（上面）から大径側端部（下端部）に向かって差し入れられており、本体部１８の外周面が本体ゴム弾性体１６に埋入した状態で配されている。特に第一の取付部材１２の軸方向長さは、本体ゴム弾性体１６の軸方向全長の３／５以上の長さとされており、第二の取付部材１４が固着された本体ゴム弾性体１６の大径部分４２にまで達している。即ち、本実施形態において、第一の取付部材１２の先端（下端）は、第二の取付部材１４の本体ゴム弾性体１６に対する固着面に対して、軸直角方向の投影でオーバーラップする位置に配されている。   In the present embodiment, the first mounting member 12 is inserted from the small diameter side end surface (upper surface) of the main rubber elastic body 16 toward the large diameter side end portion (lower end), and the outer peripheral surface of the main body portion 18 is It is arranged in a state of being embedded in the main rubber elastic body 16. In particular, the axial length of the first mounting member 12 is 3/5 or more of the axial total length of the main rubber elastic body 16, and the main rubber elastic body 16 to which the second mounting member 14 is fixed. The large diameter portion 42 is reached. In other words, in the present embodiment, the tip (lower end) of the first mounting member 12 is positioned so as to overlap with the fixing surface of the second mounting member 14 to the main rubber elastic body 16 by projection in the direction perpendicular to the axis. It is arranged.

さらに、本体ゴム弾性体１６の大径部分４２は、下面に開口する凹所４４を備えている。凹所４４は、略皿状を呈しており、開口側である下側に向けて大径となっている。更にまた、薄肉大径のシールゴム層４６が、本体ゴム弾性体１６における凹所４４の開口周縁部分から下方へ延び出すように一体形成されて、第二の取付部材１４の小径筒部３８の内周面に固着されている。なお、第一の取付部材１２の本体部１８の下面は、凹所４４の上底壁部を構成する本体ゴム弾性体１６の大径部分４２によって覆われている。   Furthermore, the large-diameter portion 42 of the main rubber elastic body 16 includes a recess 44 that opens to the lower surface. The recess 44 has a substantially dish shape and has a large diameter toward the lower side which is the opening side. Furthermore, a thin and large-diameter sealing rubber layer 46 is integrally formed so as to extend downward from the peripheral edge of the opening of the recess 44 in the main rubber elastic body 16, so that the inside of the small-diameter cylindrical portion 38 of the second mounting member 14. It is fixed to the peripheral surface. The lower surface of the main body 18 of the first mounting member 12 is covered with a large-diameter portion 42 of the main rubber elastic body 16 constituting the upper bottom wall of the recess 44.

また、本体ゴム弾性体１６の小径部分４０は、上部においてインナ凹部２４の内面に固着されている。本体ゴム弾性体１６の小径部分４０は、内周部分がインナ凹部２４の全体を充填するように配されて、インナ凹部２４の内面に加硫接着されていると共に、外周部分がインナ凹部２４の開口（図１中の二点鎖線）よりも外周に位置している。また、本体ゴム弾性体１６は、第一の取付部材１２の本体部１８におけるインナ凹部２４より下側部分の外径寸法に比して、インナ凹部２４に固着された小径部分４０の外径寸法が大きくされていると共に、小径部分４０がインナ凹部２４よりも下方に向かって次第に外径が大きくなっている。本実施形態の本体ゴム弾性体１６の小径部分４０は、外周面が外周へ向けて凹となる凹状湾曲面４８を備えており、凹状湾曲面４８において径方向の深さ寸法が最大となる最深部５０が、第一の取付部材１２におけるインナ凹部２４よりも下側部分であるインナ凹部２４の開口の下側縁部に対して、軸方向投影において外周に外れて位置している。なお、凹状湾曲面４８は、最深部５０から上下両側へ向けて外周へ傾斜するように湾曲しており、最深部５０よりも下側部分が、下方へ向けて外周へ傾斜するテーパ状外周面５１を構成している。また、最深部５０は、凹状湾曲面４８の内面において、軸直角方向でマウント中心軸（図１中の一点鎖線）に最も接近する点を言う。   The small-diameter portion 40 of the main rubber elastic body 16 is fixed to the inner surface of the inner recess 24 at the top. The small-diameter portion 40 of the main rubber elastic body 16 is arranged so that the inner peripheral portion fills the entire inner concave portion 24, and is vulcanized and bonded to the inner surface of the inner concave portion 24, and the outer peripheral portion is the inner concave portion 24. It is located on the outer periphery than the opening (two-dot chain line in FIG. 1). Further, the main rubber elastic body 16 has an outer diameter dimension of a small diameter portion 40 fixed to the inner concave portion 24 as compared with an outer diameter dimension of the lower portion of the main body portion 18 of the first mounting member 12 from the inner concave portion 24. And the outer diameter of the small-diameter portion 40 gradually increases downward from the inner recess 24. The small-diameter portion 40 of the main rubber elastic body 16 of the present embodiment includes a concave curved surface 48 whose outer peripheral surface is concave toward the outer periphery, and the deepest depth dimension in the radial direction is maximum on the concave curved surface 48. The portion 50 is located off the outer periphery in the axial projection with respect to the lower edge of the opening of the inner recess 24 that is the lower portion of the first mounting member 12 than the inner recess 24. The concave curved surface 48 is curved so as to incline toward the outer periphery from the deepest portion 50 toward both the upper and lower sides, and a tapered outer peripheral surface in which a lower side portion than the deepest portion 50 is inclined downward toward the outer periphery. 51 is constituted. Further, the deepest portion 50 refers to a point on the inner surface of the concave curved surface 48 that is closest to the mount center axis (a chain line in FIG. 1) in the direction perpendicular to the axis.

このように、本体ゴム弾性体１６の小径部分４０の上部は、インナ凹部２４の内面に固着されて、インナ凹部２４の形成部分において径方向で厚肉化されている。本実施形態では、インナ凹部２４が全周に亘って連続的に設けられていることから、本体ゴム弾性体１６の小径部分４０がインナ凹部２４によって全周に亘って厚肉化されている。なお、インナ凹部２４の最深部２６は、本体ゴム弾性体１６の凹状湾曲面４８の開口領域内に位置していると共に、凹状湾曲面４８の最深部５０よりも下側に位置している。   As described above, the upper portion of the small-diameter portion 40 of the main rubber elastic body 16 is fixed to the inner surface of the inner concave portion 24 and is thickened in the radial direction at the portion where the inner concave portion 24 is formed. In the present embodiment, since the inner recess 24 is continuously provided over the entire circumference, the small diameter portion 40 of the main rubber elastic body 16 is thickened over the entire circumference by the inner recess 24. The deepest portion 26 of the inner concave portion 24 is located in the opening region of the concave curved surface 48 of the main rubber elastic body 16 and is located below the deepest portion 50 of the concave curved surface 48.

さらに、本体ゴム弾性体１６の小径部分４０の上端は、第一の取付部材１２のフランジ状部２０の下面に固着されている。なお、本体ゴム弾性体１６の小径部分４０は、凹状湾曲面４８よりも上側において、第一の取付部材１２のフランジ状部２０に固着されている。さらに、フランジ状部２０の下面に固着される小径部分４０の上端部は、最深部５０よりも上側において上方に向かって大径とされている。   Furthermore, the upper end of the small diameter portion 40 of the main rubber elastic body 16 is fixed to the lower surface of the flange-shaped portion 20 of the first mounting member 12. The small-diameter portion 40 of the main rubber elastic body 16 is fixed to the flange-shaped portion 20 of the first attachment member 12 above the concave curved surface 48. Furthermore, the upper end portion of the small-diameter portion 40 fixed to the lower surface of the flange-shaped portion 20 has a larger diameter toward the upper side above the deepest portion 50.

また、本体ゴム弾性体１６に固着された第二の取付部材１４には、可撓性膜５２が取り付けられている。可撓性膜５２は、撓み変形および伸縮変形を許容された薄肉のゴム膜であって、全体として略円板形状とされていると共に、外周部分が内周部分よりも更に薄肉とされて十分な弛みが与えられている。   A flexible film 52 is attached to the second attachment member 14 fixed to the main rubber elastic body 16. The flexible film 52 is a thin rubber film that is allowed to bend and stretch, and has a substantially disc shape as a whole, and the outer peripheral portion is sufficiently thinner than the inner peripheral portion. The slack is given.

さらに、可撓性膜５２の外周面には、環状乃至は筒状の固定部材５４が固着されている。固定部材５４は、金属などで形成されており、シールゴム層４６で覆われた第二の取付部材１４の小径筒部３８に固定されている。本実施形態では、固定部材５４が第二の取付部材１４の小径筒部３８に差し入れられた後、第二の取付部材１４に八方絞りなどの縮径加工が施されることによって、固定部材５４の外周面がシールゴム層４６を介して第二の取付部材１４の小径筒部３８の内周面に押し付けられることで、固定部材５４が第二の取付部材１４に固定されている。更に、第二の取付部材１４の小径筒部３８の下端部が縮径時に内周へ曲げられていることによって、固定部材５４の下側への抜けが防止されている。   Further, an annular or cylindrical fixing member 54 is fixed to the outer peripheral surface of the flexible film 52. The fixing member 54 is made of metal or the like, and is fixed to the small diameter cylindrical portion 38 of the second mounting member 14 covered with the seal rubber layer 46. In this embodiment, after the fixing member 54 is inserted into the small-diameter cylindrical portion 38 of the second mounting member 14, the fixing member 54 is subjected to diameter reduction processing such as an eight-way drawing on the second mounting member 14. The fixing member 54 is fixed to the second mounting member 14 by pressing the outer peripheral surface thereof against the inner peripheral surface of the small diameter cylindrical portion 38 of the second mounting member 14 via the seal rubber layer 46. Further, the lower end portion of the small-diameter cylindrical portion 38 of the second mounting member 14 is bent toward the inner periphery when the diameter is reduced, thereby preventing the fixing member 54 from coming off to the lower side.

このように可撓性膜５２が第二の取付部材１４に取り付けられることにより、本体ゴム弾性体１６と可撓性膜５２の軸方向間には、外部から隔てられた流体封入領域５６が形成されており、非圧縮性流体が封入されている。流体封入領域５６に封入される非圧縮性流体は、特に限定されるものではないが、例えば、水やエチレングリコール、アルキレングリコール、ポリアルキレングリコール、シリコーン油、或いはそれらの混合液などの液体が望ましく、より好適には０．１Ｐａ・ｓ以下の低粘性流体が採用される。   By attaching the flexible film 52 to the second mounting member 14 in this way, a fluid-filled region 56 separated from the outside is formed between the main rubber elastic body 16 and the flexible film 52 in the axial direction. And an incompressible fluid is enclosed. The incompressible fluid sealed in the fluid sealing region 56 is not particularly limited. For example, a liquid such as water, ethylene glycol, alkylene glycol, polyalkylene glycol, silicone oil, or a mixture thereof is desirable. More preferably, a low viscosity fluid of 0.1 Pa · s or less is employed.

なお、本実施形態では、第一の取付部材１２の本体部１８の下面が本体ゴム弾性体１６の大径部分４２によって覆われており、流体封入領域５６の上底壁面は、第一の取付部材１２の本体部１８が露出することなく、略全面が本体ゴム弾性体１６によって構成されている。これにより、流体封入領域５６に封入された流体による第一の取付部材１２の侵食が防止されており、第一の取付部材１２の耐久性の向上が図られている。   In the present embodiment, the lower surface of the main body portion 18 of the first mounting member 12 is covered with the large-diameter portion 42 of the main rubber elastic body 16, and the upper bottom wall surface of the fluid sealing region 56 is the first mounting surface. The main body portion 18 of the member 12 is not exposed and substantially the entire surface is constituted by the main rubber elastic body 16. Thereby, the erosion of the first mounting member 12 by the fluid sealed in the fluid sealing region 56 is prevented, and the durability of the first mounting member 12 is improved.

また、流体封入領域５６には、仕切部材５８が配されている。仕切部材５８は、金属や硬質の合成樹脂で形成されており、全体として略円板形状とされている。更に、仕切部材５８の外周端部には、外周面に開口しながら周方向へ延びる周溝６０が１周に満たない長さで形成されている。   A partition member 58 is disposed in the fluid sealing area 56. The partition member 58 is made of metal or hard synthetic resin, and has a substantially disk shape as a whole. Furthermore, a circumferential groove 60 that extends in the circumferential direction while opening on the outer peripheral surface is formed at the outer peripheral end portion of the partition member 58 with a length that is less than one circumference.

そして、仕切部材５８は、第二の取付部材１４の小径筒部３８の内周に差し入れられて、流体封入領域５６において略軸直角方向に広がるように配されており、外周面がシールゴム層４６を介して小径筒部３８の内周面に押し付けられることで、第二の取付部材１４に対して固定されている。なお、仕切部材５８は、可撓性膜５２の固定部材５４と同様に、例えば第二の取付部材１４の縮径加工によって、第二の取付部材１４に固定される。   The partition member 58 is inserted into the inner periphery of the small-diameter cylindrical portion 38 of the second mounting member 14 and is disposed so as to extend in a direction substantially perpendicular to the axis in the fluid sealing region 56, and the outer peripheral surface is the seal rubber layer 46. Is fixed to the second mounting member 14 by being pressed against the inner peripheral surface of the small-diameter cylindrical portion 38 via the. The partition member 58 is fixed to the second mounting member 14 by, for example, diameter reduction processing of the second mounting member 14, similarly to the fixing member 54 of the flexible film 52.

さらに、仕切部材５８は、流体封入領域５６を上下に二分しており、流体封入領域５６における仕切部材５８よりも上側が、壁部の一部が本体ゴム弾性体１６で構成された受圧室６２とされていると共に、流体封入領域５６における仕切部材５８よりも下側が、壁部の一部が可撓性膜５２で構成された平衡室６４とされている。なお、受圧室６２と平衡室６４には、上記非圧縮性流体が封入されている。また、受圧室６２は、本体ゴム弾性体１６の大径部分４２の軸方向外方（下方）に設けられている。   Furthermore, the partition member 58 bisects the fluid sealing region 56 in the vertical direction, and the pressure receiving chamber 62 in which the upper side of the partition member 58 in the fluid sealing region 56 is partly composed of the main rubber elastic body 16. In addition, the lower side of the fluid sealing region 56 below the partition member 58 is an equilibrium chamber 64 in which a part of the wall portion is configured by the flexible film 52. The pressure receiving chamber 62 and the equilibrium chamber 64 are filled with the incompressible fluid. The pressure receiving chamber 62 is provided on the outer side (downward) in the axial direction of the large diameter portion 42 of the main rubber elastic body 16.

更にまた、仕切部材５８に設けられた周溝６０の外周開口は、シールゴム層４６を介して第二の取付部材１４によって流体密に覆蓋されており、周方向に延びるトンネル状の流路が形成されている。そして、トンネル状流路の一方の端部が上連通口６６を通じて受圧室６２に連通されると共に、他方の端部が下連通口６８を通じて平衡室６４に連通されることにより、受圧室６２と平衡室６４を相互に連通するオリフィス通路７０が形成されている。本実施形態のオリフィス通路７０は、通路断面積と通路長の比を調節することによって、流動流体の共振周波数であるチューニング周波数が、エンジンシェイクに相当する１０Ｈｚ程度の低周波に設定されている。尤も、オリフィス通路７０のチューニング周波数は、特に限定されない。   Furthermore, the outer peripheral opening of the circumferential groove 60 provided in the partition member 58 is covered fluid-tightly by the second mounting member 14 via the seal rubber layer 46, and a tunnel-like flow path extending in the circumferential direction is formed. Has been. Then, one end of the tunnel-shaped channel is communicated with the pressure receiving chamber 62 through the upper communication port 66, and the other end is communicated with the equilibrium chamber 64 through the lower communication port 68. An orifice passage 70 is formed to communicate the balance chamber 64 with each other. In the orifice passage 70 of the present embodiment, the tuning frequency, which is the resonance frequency of the flowing fluid, is set to a low frequency of about 10 Hz corresponding to the engine shake by adjusting the ratio of the passage sectional area and the passage length. However, the tuning frequency of the orifice passage 70 is not particularly limited.

かくの如き構造とされたエンジンマウント１０は、例えば、第一の取付部材１２が図示しないパワーユニットに取り付けられると共に、第二の取付部材１４が同じく図示しない車両ボデーに取り付けられることにより、車両に装着されている。そして、車両への装着状態において、エンジンマウント１０に上下方向の振動が入力されると、本体ゴム弾性体１６の弾性変形による振動減衰作用などの防振効果が発揮されると共に、受圧室６２と平衡室６４の相対的な圧力変動に基づいてオリフィス通路７０を通じた流体流動が生ぜしめられて、流体の流動作用に基づく防振効果が発揮される。   The engine mount 10 having such a structure is mounted on a vehicle by, for example, attaching a first mounting member 12 to a power unit (not shown) and a second mounting member 14 to a vehicle body (not shown). Has been. When vibrations in the vertical direction are input to the engine mount 10 in the mounting state on the vehicle, a vibration damping effect such as vibration damping action due to elastic deformation of the main rubber elastic body 16 is exhibited, and the pressure receiving chamber 62 and A fluid flow through the orifice passage 70 is generated based on the relative pressure fluctuation in the equilibrium chamber 64, and a vibration isolation effect based on the fluid flow action is exhibited.

本実施形態では、第一の取付部材１２の下端面２３が平坦部２３ａを備えていることによって、ピストン効率の向上による優れた防振性能の発揮が図られている。しかも、平坦部２３ａの外周側が湾曲部２３ｂとされていることで、第一の取付部材１２における下端面２３と外周面のつなぎ部分における本体ゴム弾性体１６の応力集中が防止されている。   In the present embodiment, since the lower end surface 23 of the first mounting member 12 includes the flat portion 23a, excellent vibration isolation performance due to an improvement in piston efficiency is achieved. In addition, since the outer peripheral side of the flat portion 23a is the curved portion 23b, stress concentration of the main rubber elastic body 16 at the connecting portion between the lower end surface 23 and the outer peripheral surface of the first mounting member 12 is prevented.

ここにおいて、上下方向の振動入力に際して応力が集中し易い本体ゴム弾性体１６の小径部分４０の上部が、インナ凹部２４によって厚肉化されていることから、本体ゴム弾性体１６の小径部分４０の上部において応力の集中が緩和されて、本体ゴム弾性体１６の耐久性の向上が図られる。   Here, since the upper part of the small-diameter portion 40 of the main rubber elastic body 16 where stress tends to concentrate when vibration is input in the vertical direction is thickened by the inner recess 24, the small-diameter portion 40 of the main rubber elastic body 16 is The stress concentration is relaxed at the upper part, and the durability of the main rubber elastic body 16 is improved.

特に本実施形態では、凹状湾曲面４８の最深部５０がインナ凹部２４の外周に位置しており、薄肉となり易い凹状湾曲面４８の最深部５０においてインナ凹部２４による小径部分４０の厚肉化が図られている。このように、本体ゴム弾性体１６の小径部分４０において特に薄肉となって応力が集中し易い部分が、インナ凹部２４によって厚肉化されることで、小径部分４０における耐久性の向上がより有利に図られる。   In particular, in the present embodiment, the deepest portion 50 of the concave curved surface 48 is located on the outer periphery of the inner concave portion 24, and the inner diameter of the small-diameter portion 40 is increased by the inner concave portion 24 in the deepest portion 50 of the concave curved surface 48 that tends to be thin. It is illustrated. As described above, the portion of the small-diameter portion 40 of the main rubber elastic body 16 that is particularly thin and tends to concentrate stress is thickened by the inner concave portion 24, thereby improving the durability of the small-diameter portion 40. Is envisioned.

また、本体ゴム弾性体１６においてインナ凹部２４の外周に位置する部分の外周面が、インナ凹部２４よりも下側における本体部１８の外周面に対して、より外周に位置している。これにより、本体ゴム弾性体１６においてインナ凹部２４の開口よりも外周に位置する部分は、上下方向の振動入力時に、インナ凹部２４の内面によって拘束され難く、弾性変形が許容されている。その結果、第一の取付部材１２からの下向きの入力が本体ゴム弾性体１６に効率的に伝達されることから、本体ゴム弾性体１６の上下方向の圧縮ばね成分を大きく得ることができて、ばね特性を大きな自由度でチューニングすることができる。   Further, the outer peripheral surface of the main rubber elastic body 16 located on the outer periphery of the inner concave portion 24 is positioned more on the outer periphery than the outer peripheral surface of the main body portion 18 below the inner concave portion 24. As a result, the portion of the main rubber elastic body 16 located on the outer periphery from the opening of the inner recess 24 is not easily restrained by the inner surface of the inner recess 24 when the vibration is input in the vertical direction, and elastic deformation is allowed. As a result, since the downward input from the first mounting member 12 is efficiently transmitted to the main rubber elastic body 16, a large compression spring component in the vertical direction of the main rubber elastic body 16 can be obtained. The spring characteristics can be tuned with a large degree of freedom.

しかも、本実施形態では、インナ凹部２４の内面が、最深部２６から軸方向両側に向けて外周へ傾斜する上下のテーパ面３０，３２を有している。それ故、上側のテーパ面３０によって、第一の取付部材１２から本体ゴム弾性体１６へ下向きの力が及ぼされ易くなっていると共に、インナ凹部２４の内面から本体ゴム弾性体１６へ及ぼされた下向きの力が、下側のテーパ面３２によって妨げられることなく、本体ゴム弾性体１６の大径部分４２へ効率的に伝達される。このように、インナ凹部２４の外周に配された本体ゴム弾性体１６は、上下方向の振動入力時に変形するようになっていることから、本体ゴム弾性体１６の小径部分４０の実質的なゴムボリュームが、インナ凹部２４によって大きく確保されており、小径部分４０の耐久性の向上が有効に実現されている。   Moreover, in the present embodiment, the inner surface of the inner recess 24 has upper and lower tapered surfaces 30 and 32 that are inclined from the deepest portion 26 toward the outer periphery toward both axial sides. Therefore, the upper taper surface 30 facilitates a downward force from the first mounting member 12 to the main rubber elastic body 16 and from the inner surface of the inner recess 24 to the main rubber elastic body 16. The downward force is efficiently transmitted to the large-diameter portion 42 of the main rubber elastic body 16 without being hindered by the lower tapered surface 32. Thus, since the main rubber elastic body 16 disposed on the outer periphery of the inner recess 24 is adapted to be deformed when vibrations are input in the vertical direction, the substantial rubber of the small diameter portion 40 of the main rubber elastic body 16 is changed. A large volume is secured by the inner concave portion 24, and the improvement of the durability of the small diameter portion 40 is effectively realized.

特に本実施形態では、第一の取付部材１２の上端部に外周へ突出するフランジ状部２０が設けられており、フランジ状部２０の下面に本体ゴム弾性体１６の上端が固着されている。これにより、第一の取付部材１２から本体ゴム弾性体１６へ下向きの力がより有利に及ぼされる。しかも、本体ゴム弾性体１６の上端における第一の取付部材１２への固着面積が大きく確保されて、第一の取付部材１２と本体ゴム弾性体１６の固着強度を大きく得ることもできる。   In particular, in the present embodiment, a flange-like portion 20 that protrudes to the outer periphery is provided at the upper end portion of the first mounting member 12, and the upper end of the main rubber elastic body 16 is fixed to the lower surface of the flange-like portion 20. Thereby, the downward force is more advantageously exerted from the first mounting member 12 to the main rubber elastic body 16. In addition, a large fixing area to the first mounting member 12 at the upper end of the main rubber elastic body 16 can be secured, and the fixing strength between the first mounting member 12 and the main rubber elastic body 16 can be increased.

さらに、インナ凹部２４の最深部２６付近の内面が、縦断面において外周へ向けて凹となる円弧状湾曲面２８とされていることにより、本体ゴム弾性体１６においてインナ凹部２４の最深部２６に固着される部分の応力集中が緩和される。また、インナ凹部２４において最深部２６を含む深さ寸法の大きな領域が、円弧状湾曲面２８によって上下にある程度の幅をもって設定されていることにより、本体ゴム弾性体１６の小径部分４０がインナ凹部２４によって上下方向の広い範囲に亘って厚肉化されている。   Furthermore, since the inner surface of the inner recess 24 near the deepest portion 26 is an arcuate curved surface 28 that is concave toward the outer periphery in the longitudinal section, the inner rubber recess 16 has a deepest portion 26 of the inner recess 24. The stress concentration at the fixed part is alleviated. In addition, since the region having a large depth including the deepest portion 26 in the inner concave portion 24 is set with a certain amount of width by the arcuate curved surface 28, the small-diameter portion 40 of the main rubber elastic body 16 becomes the inner concave portion. 24 is thickened over a wide range in the vertical direction.

更にまた、インナ凹部２４が全周に亘って連続する環状とされていることにより、インナ凹部２４の形成による本体ゴム弾性体１６の小径部分４０の厚肉化が全周に亘って実現されており、応力の分散化による本体ゴム弾性体１６の耐久性の向上がより効果的に実現される。しかも、本実施形態では、インナ凹部２４が全周に亘って略一定の断面形状を有していることにより、インナ凹部２４の断面形状の変化に起因する応力の集中も回避されており、本体ゴム弾性体１６の耐久性の向上がより有利に図られている。   Furthermore, since the inner recess 24 is formed in an annular shape that extends continuously over the entire circumference, the increase in the thickness of the small-diameter portion 40 of the main rubber elastic body 16 due to the formation of the inner recess 24 is realized over the entire circumference. Thus, the durability of the main rubber elastic body 16 can be improved more effectively by dispersing the stress. In addition, in this embodiment, since the inner recess 24 has a substantially constant cross-sectional shape over the entire circumference, stress concentration due to a change in the cross-sectional shape of the inner recess 24 is also avoided, and the main body The durability of the rubber elastic body 16 is improved more advantageously.

また、本体ゴム弾性体１６の小径部分４０の外周面が、外周に向けて凹となる凹状湾曲面４８を備えており、インナ凹部２４の最深部２６が、凹状湾曲面４８において最も内周に位置する最深部５０よりも下側に位置している。これにより、仮に凹状湾曲面４８の最深部５０付近で本体ゴム弾性体１６の小径部分４０に亀裂が発生したとしても、亀裂の伸展がインナ凹部２４の内面によって抑制されて、亀裂が本体ゴム弾性体１６の大径部分４２まで到達し難くなる。   In addition, the outer peripheral surface of the small diameter portion 40 of the main rubber elastic body 16 includes a concave curved surface 48 that is concave toward the outer periphery, and the deepest portion 26 of the inner concave portion 24 is at the innermost periphery of the concave curved surface 48. It is located below the deepest part 50 that is located. Thus, even if a crack occurs in the small diameter portion 40 of the main rubber elastic body 16 near the deepest portion 50 of the concave curved surface 48, the extension of the crack is suppressed by the inner surface of the inner concave portion 24, and the crack is elastic. It becomes difficult to reach the large-diameter portion 42 of the body 16.

さらに、本体ゴム弾性体１６の圧縮によるひずみや応力は、本体ゴム弾性体１６の存在する側である凹状湾曲面４８の最深部５０よりも下側において、上側よりも大きく発生し易い。それ故、凹状湾曲面４８の最深部５０よりもインナ凹部２４の最深部２６を下方に位置せしめて、応力やひずみの大きくなる部位におけるゴム厚さを大きく設定することで、ひずみや応力の軽減を図ることも可能になる。   Further, strain and stress due to compression of the main rubber elastic body 16 are more likely to be generated on the lower side of the deepest portion 50 of the concave curved surface 48 on the side where the main rubber elastic body 16 exists than on the upper side. Therefore, the deepest portion 26 of the inner concave portion 24 is positioned below the deepest portion 50 of the concave curved surface 48, and the rubber thickness at the portion where the stress and strain increase is set larger, thereby reducing strain and stress. It is also possible to plan.

また、第一の取付部材１２の本体部１８の下端面２３が本体ゴム弾性体１６によって覆われており、受圧室６２の上底壁面が全体に亘って本体ゴム弾性体１６で構成されていることにより、受圧室６２の壁面において本体ゴム弾性体１６の自由表面が大きく確保されて、本体ゴム弾性体１６の耐久性の向上が図られている。   Further, the lower end surface 23 of the main body portion 18 of the first mounting member 12 is covered with the main rubber elastic body 16, and the upper bottom wall surface of the pressure receiving chamber 62 is constituted by the main rubber elastic body 16 throughout. Thus, a large free surface of the main rubber elastic body 16 is secured on the wall surface of the pressure receiving chamber 62, and the durability of the main rubber elastic body 16 is improved.

図２には、本発明に係る防振装置の第二の実施形態として、自動車用のエンジンマウント８０を示す。エンジンマウント８０は、第一の取付部材８２と第二の取付部材１４が本体ゴム弾性体１６によって弾性連結された構造を有している。以下の説明において、第一の実施形態と実質的に同一の部材および部位については、図中に同一の符号を付すことで、説明を省略する。   FIG. 2 shows an engine mount 80 for an automobile as a second embodiment of the vibration isolator according to the present invention. The engine mount 80 has a structure in which the first mounting member 82 and the second mounting member 14 are elastically connected by the main rubber elastic body 16. In the following description, members and portions that are substantially the same as those in the first embodiment are denoted by the same reference numerals in the drawings, and the description thereof is omitted.

より詳細には、第一の取付部材８２は、図３にも示すように、本体部１８の軸方向中間部分に周溝状凹部８４が形成されている。周溝状凹部８４は、インナ凹部２４よりも軸方向下方に設けられて、本体部１８の外周面に開口しながら周方向に延びており、本実施形態では、略一定の断面形状で全周に亘って連続して延びている。   More specifically, as shown in FIG. 3, the first mounting member 82 has a circumferential groove-shaped recess 84 formed in the intermediate portion in the axial direction of the main body 18. The circumferential groove-shaped recess 84 is provided below the inner recess 24 in the axial direction, and extends in the circumferential direction while opening to the outer peripheral surface of the main body portion 18. In this embodiment, the circumferential groove-shaped recess 84 has a substantially constant cross-sectional shape. Extending continuously.

さらに、周溝状凹部８４は、軸方向の断面形状において、外周面（凹部内面）の略全体が滑らかに湾曲する湾曲形状とされている。また、本実施形態の周溝状凹部８４は、最深部８６における径方向の深さ寸法が、インナ凹部２４の最深部２６における深さ寸法よりも小さくされており、例えば、インナ凹部２４の最深部２６の深さ寸法に対して１／２以下とされている。   Furthermore, the circumferential groove-shaped recess 84 has a curved shape in which substantially the entire outer peripheral surface (the inner surface of the recess) is smoothly curved in the cross-sectional shape in the axial direction. Further, in the circumferential groove-like recess 84 of the present embodiment, the depth dimension in the radial direction at the deepest portion 86 is smaller than the depth dimension at the deepest portion 26 of the inner recess 24, for example, the deepest of the inner recess 24. The depth dimension of the portion 26 is set to 1/2 or less.

また、周溝状凹部８４の軸方向両側には、外周突部８８ａ，８８ｂが設けられている。外周突部８８ａ，８８ｂは、何れも第一の取付部材８２における周溝状凹部８４の形成部分に比して大径とされており、上側の外周突部８８ａがインナ凹部２４と周溝状凹部８４の間に設けられていると共に、下側の外周突部８８ｂが周溝状凹部８４よりも下方に設けられている。   Further, outer peripheral projections 88 a and 88 b are provided on both sides in the axial direction of the circumferential groove-shaped recess 84. Each of the outer peripheral projections 88a and 88b has a larger diameter than the portion where the circumferential groove-shaped recess 84 is formed in the first mounting member 82, and the upper outer peripheral projection 88a is formed in the shape of the inner recess 24 and the circumferential groove. While being provided between the recesses 84, a lower outer peripheral projection 88 b is provided below the circumferential groove-like recess 84.

さらに、周溝状凹部８４の外周面と外周突部８８ａ，８８ｂの外周面は、軸方向で滑らかに湾曲してつながった波形状とされている。また、インナ凹部２４の外周面（内面）と上側の外周突部８８ａの外周面も、軸方向で滑らかに湾曲してつながった波形状とされており、第一の取付部材８２の本体部１８の外周面全体が、折れ点や折れ線を持たない滑らかな面形状とされている。   Furthermore, the outer peripheral surface of the circumferential groove-shaped recess 84 and the outer peripheral surfaces of the outer peripheral protrusions 88a and 88b are formed into a wave shape that is smoothly curved and connected in the axial direction. In addition, the outer peripheral surface (inner surface) of the inner recess 24 and the outer peripheral surface of the upper outer peripheral protrusion 88a are also formed into a wave shape that is smoothly curved and connected in the axial direction. The entire outer peripheral surface of the surface has a smooth surface shape having no break points or broken lines.

そして、本実施形態の第一の取付部材８２は、第一の実施形態の第一の取付部材１２と同様に、本体ゴム弾性体１６に対して小径側端面である上端面から下向きに入り込んだ状態で加硫接着されている。   And the 1st attachment member 82 of this embodiment entered downward from the upper end surface which is a small diameter side end surface to main part rubber elastic body 16, like the 1st attachment member 12 of a 1st embodiment. It is vulcanized and bonded in the state.

さらに、周溝状凹部８４において径方向の深さ寸法が最大となる最深部８６は、本体ゴム弾性体１６の大径部分４２における第二の取付部材１４の内周面への固着面に対して、軸方向上側に離れて位置している。本実施形態では、周溝状凹部８４の全体が、大径部分４２に対して軸方向上側に離れて位置しており、周溝状凹部８４の外周面には、本体ゴム弾性体１６の小径部分４０が固着されている。   Further, the deepest portion 86 having the maximum radial depth in the circumferential groove-shaped recess 84 is in relation to the surface of the large-diameter portion 42 of the main rubber elastic body 16 fixed to the inner peripheral surface of the second mounting member 14. And are located apart on the upper side in the axial direction. In the present embodiment, the entire circumferential groove-like recess 84 is located away from the large-diameter portion 42 in the axial direction, and a small diameter of the main rubber elastic body 16 is formed on the outer circumferential surface of the circumferential groove-like recess 84. The portion 40 is fixed.

更にまた、周溝状凹部８４の外周面と第二の取付部材１４の内周面との対向面間は、本体ゴム弾性体１６の凹状湾曲面４８の下部であるテーパ状外周面５１と同じ傾斜方向で、中実構造の本体ゴム弾性体１６によって連結されている。要するに、本実施形態では、周溝状凹部８４が本体ゴム弾性体１６によって充填されていると共に、周溝状凹部８４の外周面と第二の取付部材１４の内周面との対向面間が、下方に向けて外周へ傾斜する傾斜方向において、本体ゴム弾性体１６によって連続的に連結されており、それら周溝状凹部８４の外周面と第二の取付部材１４の内周面との傾斜方向の対向面間には、空所や液室などが形成されていない。なお、周溝状凹部８４の外周面と第二の取付部材１４の内周面とを連結する本体ゴム弾性体１６は、テーパ状外周面５１と同じ傾斜方向に連続して延びていれば良く、傾斜角度は特に限定されない。   Furthermore, the gap between the outer peripheral surface of the circumferential groove-shaped recess 84 and the inner peripheral surface of the second mounting member 14 is the same as the tapered outer peripheral surface 51 which is the lower part of the concave curved surface 48 of the main rubber elastic body 16. In the inclined direction, they are connected by a solid rubber elastic body 16 having a solid structure. In short, in this embodiment, the circumferential groove-shaped recess 84 is filled with the main rubber elastic body 16, and the distance between the opposing surfaces of the outer circumferential surface of the circumferential groove-shaped recess 84 and the inner circumferential surface of the second mounting member 14 is between. In the inclination direction inclined downward toward the outer periphery, the main body rubber elastic body 16 is continuously connected, and the outer peripheral surface of the circumferential groove-shaped recess 84 and the inner peripheral surface of the second mounting member 14 are inclined. No voids or liquid chambers are formed between the opposing surfaces in the direction. The main rubber elastic body 16 that connects the outer peripheral surface of the circumferential groove-shaped recess 84 and the inner peripheral surface of the second mounting member 14 only needs to extend continuously in the same inclination direction as the tapered outer peripheral surface 51. The inclination angle is not particularly limited.

このような本実施形態に従う構造とされたエンジンマウント８０によれば、第一の取付部材８２の本体部１８に周溝状凹部８４が形成されていることにより、本体ゴム弾性体１６の自由長が周溝状凹部８４の外周面と第二の取付部材１４の内周面とをつなぐ傾斜方向で大きくされている。これにより、例えば、軸方向に対して傾斜した方向の入力に際して、本体ゴム弾性体１６に作用する応力の分散化が図られて、傾斜方向の入力に対する本体ゴム弾性体１６の耐久性の向上が図られる。特に本実施形態では、軸方向の入力に対する本体ゴム弾性体１６の耐久性の向上が、インナ凹部２４によって実現されることから、それらインナ凹部２４と周溝状凹部８４の両方を備える第一の取付部材８２によって、軸方向と軸方向に対して傾斜する方向との両方の入力に対して、優れた耐久性を実現することができる。   According to the engine mount 80 having the structure according to the present embodiment as described above, the circumferential groove-like recess 84 is formed in the main body portion 18 of the first mounting member 82, so that the free length of the main rubber elastic body 16 is increased. Is enlarged in the inclination direction connecting the outer peripheral surface of the circumferential groove-shaped recess 84 and the inner peripheral surface of the second mounting member 14. As a result, for example, the stress acting on the main rubber elastic body 16 can be dispersed upon input in a direction inclined with respect to the axial direction, and the durability of the main rubber elastic body 16 with respect to the input in the inclination direction can be improved. Figured. In particular, in the present embodiment, since the improvement of the durability of the main rubber elastic body 16 with respect to the input in the axial direction is realized by the inner concave portion 24, the first including both the inner concave portion 24 and the circumferential groove-shaped concave portion 84 is provided. The mounting member 82 can realize excellent durability with respect to both input in the axial direction and the direction inclined with respect to the axial direction.

さらに、周溝状凹部８４の軸方向両側に外周突部８８ａ，８８ｂが形成されていることから、周溝状凹部８４の形成による上下方向の防振特性への影響が軽減されている。すなわち、下側の外周突部８８ｂが設けられていることで第一の取付部材８２の下端面２３の面積が大きく確保されていることにより、上下方向の振動入力時に下端面２３から受圧室６２に力が効率的に及ぼされて、受圧室６２の内圧変動が効率的に惹起されることから、流体の流動作用に基づく防振効果を有効に得ることができる。また、上下方向の振動入力時に、周溝状凹部８４内の本体ゴム弾性体１６が上側へ逃げるように変形するのが、上側の外周突部８８ａが設けられていることで防止される。それ故、周溝状凹部８４の形成による受圧室６２の拡張ばねの低下が防止されて、受圧室６２のポンプ効果を十分に得ることができ、流体の流動作用に基づく防振効果を有効に得ることができる。   Further, since the outer peripheral projections 88a and 88b are formed on both sides in the axial direction of the circumferential groove-shaped recess 84, the influence on the vertical vibration isolation characteristics due to the formation of the circumferential groove-shaped recess 84 is reduced. That is, since the lower outer peripheral projection 88b is provided to ensure a large area of the lower end surface 23 of the first mounting member 82, the pressure receiving chamber 62 is provided from the lower end surface 23 at the time of vibration input in the vertical direction. Since the force is efficiently applied to the pressure receiving chamber 62 and the internal pressure fluctuation of the pressure receiving chamber 62 is efficiently induced, a vibration isolation effect based on the fluid flow action can be effectively obtained. Further, when the vibration is input in the vertical direction, the main rubber elastic body 16 in the circumferential groove-shaped recess 84 is prevented from being deformed so as to escape upward by the provision of the upper outer peripheral projection 88a. Therefore, the expansion spring of the pressure receiving chamber 62 is prevented from being lowered due to the formation of the circumferential groove-like recess 84, and the pump effect of the pressure receiving chamber 62 can be sufficiently obtained, and the vibration isolation effect based on the fluid flow action is effectively obtained. Obtainable.

更にまた、周溝状凹部８４の外周面と外周突部８８ａ，８８ｂの外周面が軸方向で滑らかに連続していることから、本体ゴム弾性体１６において応力の分散化が図られて、耐久性の更なる向上が図られる。特に本実施形態では、本体ゴム弾性体１６に軸方向で入り込んで固着される第一の取付部材８２の本体部１８の外周面全体が、軸方向に滑らかに連続する波打ち形状とされていることから、インナ凹部２４や周溝状凹部８４の形成による本体ゴム弾性体１６の応力集中が緩和されて、本体ゴム弾性体１６の耐久性が確保される。   Furthermore, since the outer peripheral surface of the circumferential groove-shaped recess 84 and the outer peripheral surfaces of the outer peripheral projections 88a, 88b are smoothly continuous in the axial direction, stress can be dispersed in the main rubber elastic body 16, and durability can be improved. Further improvement in performance is achieved. In particular, in the present embodiment, the entire outer peripheral surface of the main body portion 18 of the first mounting member 82 that enters and adheres to the main rubber elastic body 16 in the axial direction has a corrugated shape that smoothly continues in the axial direction. Therefore, the stress concentration of the main rubber elastic body 16 due to the formation of the inner concave portion 24 and the circumferential groove-shaped concave portion 84 is alleviated, and the durability of the main rubber elastic body 16 is ensured.

ところで、前記第二の実施形態に従う構造とされた本発明に係るエンジンマウント（実施例）と、第一の取付部材の外周面に周溝状凹部を持たないエンジンマウント（比較例）について、傾斜方向の入力に対する本体ゴム弾性体のひずみの分布をシミュレーションしてみると、周溝状凹部を設けた実施例では、周溝状凹部を持たない比較例に比べて、周溝状凹部への固着部分の軸方向両側にひずみが分散されており、第一の取付部材の軸方向中央部分に設けられた周溝状凹部への固着部分においてひずみが低減されていた。このように、周溝状凹部を設けることによって、傾斜方向の入力時に本体ゴム弾性体のひずみが分散されて低減されるという本発明の効果は、シミュレーションによっても確認されている。   By the way, the engine mount (example) according to the present invention having the structure according to the second embodiment and the engine mount (comparative example) having no circumferential groove-like recess on the outer peripheral surface of the first mounting member are inclined. Simulation of the strain distribution of the main rubber elastic body against the direction input shows that the example in which the circumferential groove-like recess is provided is fixed to the circumferential groove-like recess as compared with the comparative example having no circumferential groove-like recess. The strain was distributed on both sides in the axial direction of the portion, and the strain was reduced in the portion fixed to the circumferential groove-shaped recess provided in the axial central portion of the first mounting member. Thus, by providing the circumferential groove-like recess, the effect of the present invention that the strain of the main rubber elastic body is dispersed and reduced at the time of input in the tilt direction has been confirmed by simulation.

以上、本発明の実施形態について詳述してきたが、本発明はその具体的な記載によって限定されない。例えば、本体ゴム弾性体１６の小径部分４０の外周面は、全体に亘って上方に向けて小径となるテーパ形状とされて、凹状湾曲面４８をなしていなくても良い。小径部分４０の外周面が凹状湾曲面４８を有する場合に、凹状湾曲面４８の最深部５０は、インナ凹部２４の最深部２６に対して略同じ上下位置に配されていても良いし、インナ凹部２４の最深部２６に対して下側に配されていても良い。   As mentioned above, although embodiment of this invention was explained in full detail, this invention is not limited by the specific description. For example, the outer peripheral surface of the small-diameter portion 40 of the main rubber elastic body 16 may have a tapered shape with a small diameter toward the upper side and may not form the concave curved surface 48. When the outer peripheral surface of the small-diameter portion 40 has the concave curved surface 48, the deepest portion 50 of the concave curved surface 48 may be disposed at substantially the same vertical position with respect to the deepest portion 26 of the inner concave portion 24. You may distribute | arrange below with respect to the deepest part 26 of the recessed part 24. FIG.

また、インナ凹部の形状は、適宜に変更され得る。具体的には、例えば、前記実施形態のインナ凹部２４の内面は、最深部２６付近が円弧状湾曲面２８とされていると共に、円弧状湾曲面２８の上下両側にテーパ面３０，３２の各一方が連続して設けられていたが、インナ凹部の内面全体が円弧状の湾曲面で構成されていても良い。   Further, the shape of the inner recess can be changed as appropriate. Specifically, for example, the inner concave portion 24 of the above-described embodiment has an arcuate curved surface 28 in the vicinity of the deepest portion 26, and tapered surfaces 30, 32 on both upper and lower sides of the arcuate curved surface 28. Although one side was provided continuously, the whole inner surface of the inner recess may be formed of an arcuate curved surface.

さらに、インナ凹部は、必ずしも第一の取付部材の全周に亘って連続する環状である必要はなく、例えば、一周に満たない長さで周方向に連続するＣ字状の溝や、径方向一方向に直線的に延びる溝であっても良いし、スポット的な凹みであっても良い。   Furthermore, the inner concave portion does not necessarily have to be an annular shape that extends continuously over the entire circumference of the first mounting member. For example, a C-shaped groove that is continuous in the circumferential direction with a length less than one circumference, It may be a groove extending linearly in one direction or a spot-like recess.

第一の取付部材１２の本体部１８の外周面は、例えば下方に向けて小径となるテーパ形状であっても良い。これによれば、第一の取付部材１２の本体部１８と第二の取付部材１４との間で本体ゴム弾性体１６の圧縮ばね成分を有利に得ることができる。また、第一の取付部材１２の突出部は、前記実施形態のフランジ状部２０のような全周に設けられるフランジ状のものに限定されず、例えば、周方向で部分的に設けられていても良いし、突出部がなくても良い。なお、突出部がない場合には、例えば第一の取付部材１２の外周面の全体がテーパ形状とされ得る。   The outer peripheral surface of the main body portion 18 of the first mounting member 12 may be, for example, a tapered shape having a smaller diameter toward the lower side. According to this, the compression spring component of the main rubber elastic body 16 can be advantageously obtained between the main body portion 18 of the first mounting member 12 and the second mounting member 14. Moreover, the protrusion part of the 1st attachment member 12 is not limited to the flange-shaped thing provided in the perimeter like the flange-shaped part 20 of the said embodiment, For example, it is provided partially in the circumferential direction. Or no protrusion. In addition, when there is no protrusion part, the whole outer peripheral surface of the 1st attachment member 12 can be made into a taper shape, for example.

さらに、本体部１８の下端面２３は、平坦部２３ａを備えていなくても良く、例えば、全体が湾曲部２３ｂのような外周へ向けて上傾する湾曲面で構成されていても良い。   Furthermore, the lower end surface 23 of the main body 18 may not include the flat portion 23a, and for example, the entire lower end surface 23 may be formed of a curved surface that is inclined upward toward the outer periphery, such as the curved portion 23b.

また、前記第二の実施形態では、全周に亘って連続して延びる周溝状凹部８４を例示したが、例えば、図４，５に示す第一の取付部材９０のように、周方向で部分的に設けられた周溝状凹部９２を採用することもできる。図４，５の実施形態では、一対の周溝状凹部９２，９２が径方向一方向（図５中の上下方向）で対向する位置に設けられており、それら一対の周溝状凹部９２，９２の形成部分において、本体ゴム弾性体１６の自由長が大きく確保されている。これによれば、例えば、互いに直交する径方向２方向のばね特性を、周溝状凹部９２の有無によって互いに異なるように調節して、要求されるばね比を実現することなども可能になる。   Moreover, in the said 2nd embodiment, although the circumferential groove-shaped recessed part 84 extended continuously over a perimeter was illustrated, for example, like the 1st attachment member 90 shown to FIG. It is also possible to employ a circumferential groove-like recess 92 provided partially. In the embodiment of FIGS. 4 and 5, the pair of circumferential groove-like recesses 92, 92 are provided at positions facing each other in one radial direction (the vertical direction in FIG. 5). A large free length of the main rubber elastic body 16 is ensured in the formation portion 92. According to this, for example, the required spring ratio can be realized by adjusting the spring characteristics in the two radial directions orthogonal to each other so as to be different from each other depending on the presence or absence of the circumferential groove-like recess 92.

なお、図４，５に示す第一の取付部材９０では、周溝状凹部９２が周方向の２箇所に設けられていることから、それら周溝状凹部９２，９２の軸方向両側にそれぞれ外周突部９４ａ，９４ｂが設けられており、外周突部９４ａ，９４ｂも周方向で部分的に設けられている。また、周溝状凹部９２の外周面は、本体部１８における周溝状凹部９２を周方向に外れた両側の外周面と軸方向に外れた両側の外周面とに対して、それぞれ折れ点や折れ線を持たない滑らかな面でつながっている。   In the first mounting member 90 shown in FIGS. 4 and 5, the circumferential groove-like recesses 92 are provided at two locations in the circumferential direction. The protrusions 94a and 94b are provided, and the outer peripheral protrusions 94a and 94b are also partially provided in the circumferential direction. In addition, the outer peripheral surface of the circumferential groove-like recess 92 has a bending point and an outer peripheral surface on both sides of the main body portion 18 that deviate from the circumferential groove-like recess 92 in the circumferential direction and both outer circumferential surfaces that deviate in the axial direction. It is connected on a smooth surface without a broken line.

さらに、前記第二の実施形態の周溝状凹部８４は、周方向に略一定の断面形状で延びていたが、周方向で断面形状が変化するようにもできる。例えば、図４，５に示す一対の周溝状凹部９２，９２において、軸方向寸法や深さ寸法が周方向両端に向けて徐々に小さくなっていても良い。加えて、前記第二の実施形態では、周溝状凹部８４がインナ凹部２４よりも浅い凹形状とされているが、インナ凹部２４より深い凹形状の周溝状凹部を採用することもできる。また、周溝状凹部８４において、開口部の軸方向寸法や最深部８６に対する軸方向両側の外周面の傾斜角度なども、適宜に変更され得る。   Furthermore, although the circumferential groove-shaped recess 84 of the second embodiment extends with a substantially constant cross-sectional shape in the circumferential direction, the cross-sectional shape can be changed in the circumferential direction. For example, in the pair of circumferential groove-like recesses 92 and 92 shown in FIGS. 4 and 5, the axial dimension and the depth dimension may be gradually decreased toward both ends in the circumferential direction. In addition, in the second embodiment, the circumferential groove-shaped recess 84 has a concave shape shallower than the inner recess 24, but a concave groove-shaped circumferential groove-shaped recess deeper than the inner recess 24 can also be adopted. Further, in the circumferential groove-shaped recess 84, the axial dimension of the opening, the inclination angles of the outer peripheral surfaces on both axial sides with respect to the deepest portion 86, and the like can be changed as appropriate.

さらに、周方向で部分的な周溝状凹部の３つ以上を、同一周上で周方向に離れた位置に設けることもできる。また、複数の周溝状凹部を軸方向で並ぶように並列的に設けることもできる。   Furthermore, three or more circumferential groove-shaped recesses in the circumferential direction can be provided at positions separated in the circumferential direction on the same circumference. Also, a plurality of circumferential groove-like recesses can be provided in parallel so as to be aligned in the axial direction.

また、本発明は、流体封入式防振装置にのみ適用されるものではなく、流体封入領域５６を持たないソリッドタイプの防振装置に適用することもできる。さらに、本発明は、第一の取付部材と第二の取付部材が同軸的に配置されて、本体ゴム弾性体によって径方向に弾性連結された筒形防振装置にも適用可能である。   The present invention is not only applied to the fluid-filled vibration isolator, but can also be applied to a solid-type vibration isolator that does not have the fluid-filled region 56. Furthermore, the present invention is also applicable to a cylindrical vibration isolator in which a first mounting member and a second mounting member are arranged coaxially and elastically connected in a radial direction by a main rubber elastic body.

１０，８０：エンジンマウント（防振装置）、１２，８２，９０：第一の取付部材、１４：第二の取付部材、１６：本体ゴム弾性体、２０：フランジ状部（突出部）、２３：下端面（軸方向下方の端面）、２３ａ：平坦部、２３ｂ：湾曲部（平坦部の外周）、２４：インナ凹部、２６：最深部（インナ凹部の最深部）、２８：円弧状湾曲面（湾曲面）、４０：小径部分、４２：大径部分、４８：凹状湾曲面、５０：最深部（凹状湾曲面の最深部）、６２：受圧室、８４，９２：周溝状凹部 10, 80: engine mount (vibration isolation device) 12, 82, 90: first mounting member, 14: second mounting member, 16: main rubber elastic body, 20: flange-like portion (protruding portion), 23 : Lower end surface (end surface in the axial direction), 23a: flat part, 23b: curved part (outer periphery of flat part), 24: inner concave part, 26: deepest part (deepest part of inner concave part), 28: arc-shaped curved surface (Curved surface), 40: small diameter portion, 42: large diameter portion, 48: concave curved surface, 50: deepest portion (deepest portion of concave curved surface), 62: pressure receiving chamber, 84, 92: circumferential groove-shaped concave portion

Claims (10)

第一の取付部材と第二の取付部材が本体ゴム弾性体によって弾性連結されている防振装置において、
前記本体ゴム弾性体の上部が小径部分とされていると共に、該本体ゴム弾性体の下部が大径部分とされて、該本体ゴム弾性体の該小径部分に前記第一の取付部材が固着されていると共に、該本体ゴム弾性体の該大径部分に前記第二の取付部材が固着されている一方、
該第一の取付部材には外周面に開口するインナ凹部が形成されて、該本体ゴム弾性体の該小径部分が該インナ凹部に固着されていると共に、該インナ凹部に固着された部分における該本体ゴム弾性体の外径寸法が該インナ凹部よりも下側における該第一の取付部材の外径寸法に比して大きくされており、該本体ゴム弾性体の該小径部分が該インナ凹部に固着されることで厚肉化されていることを特徴とする防振装置。 In the vibration isolator in which the first mounting member and the second mounting member are elastically connected by the main rubber elastic body,
An upper portion of the main rubber elastic body is a small diameter portion, and a lower portion of the main rubber elastic body is a large diameter portion, and the first mounting member is fixed to the small diameter portion of the main rubber elastic body. And the second mounting member is fixed to the large-diameter portion of the main rubber elastic body,
The first mounting member is formed with an inner recess opening on the outer peripheral surface, and the small-diameter portion of the main rubber elastic body is fixed to the inner recess, and the portion in the portion fixed to the inner recess is The outer diameter of the main rubber elastic body is larger than the outer diameter of the first mounting member on the lower side of the inner recess, and the small diameter portion of the main rubber elastic body is formed in the inner recess. A vibration isolator characterized by being thickened by being fixed. 前記インナ凹部の内面は深さ寸法が最大となる最深部から上下両側に向けて外周へ傾斜するテーパ形状を有している請求項１に記載の防振装置。   The anti-vibration device according to claim 1, wherein an inner surface of the inner concave portion has a tapered shape that inclines toward an outer periphery from a deepest portion having a maximum depth dimension toward both upper and lower sides. 前記インナ凹部の最深部の内面が外周へ向けて凹となる湾曲面とされている請求項２に記載の防振装置。   The vibration isolator according to claim 2, wherein an inner surface of a deepest portion of the inner recess is a curved surface that is concave toward the outer periphery. 前記本体ゴム弾性体の前記小径部分の外周面が外周に向けて凹となる凹状湾曲面を有しており、該凹状湾曲面の最深部よりも該インナ凹部の最深部が下側に位置している請求項１〜３の何れか一項に記載の防振装置。   The outer peripheral surface of the small-diameter portion of the main rubber elastic body has a concave curved surface that becomes concave toward the outer periphery, and the deepest portion of the inner concave portion is located below the deepest portion of the concave curved surface. The vibration isolator as described in any one of Claims 1-3. 前記第一の取付部材の下面が前記本体ゴム弾性体の前記大径部分によって覆われている請求項１〜４の何れか一項に記載の防振装置。   The vibration isolator as described in any one of Claims 1-4 with which the lower surface of said 1st attachment member is covered with the said large diameter part of the said main body rubber elastic body. 前記インナ凹部が前記第一の取付部材の全周に亘って連続して設けられている請求項１〜５の何れか一項に記載の防振装置。   The vibration isolator according to any one of claims 1 to 5, wherein the inner recess is continuously provided over the entire circumference of the first mounting member. 前記第一の取付部材において外周へ突出する突出部が前記インナ凹部よりも上側に設けられている請求項１〜６の何れか一項に記載の防振装置。   The vibration isolator as described in any one of Claims 1-6 in which the protrusion part which protrudes to an outer periphery in said 1st attachment member is provided above the said inner recessed part. 前記第一の取付部材には、前記インナ凹部よりも軸方向下方において外周面に開口して周方向に延びる周溝状凹部が設けられており、該周溝状凹部の外周面と前記第二の取付部材の内周面との対向面間が前記本体ゴム弾性体で連結されている請求項１〜７の何れか一項に記載の防振装置。   The first mounting member is provided with a circumferential groove-like recess that opens in the outer circumferential surface in the axial direction below the inner recess and extends in the circumferential direction. The outer circumferential surface of the circumferential groove-like recess and the second The vibration isolator as described in any one of Claims 1-7 with which the opposing surface with the internal peripheral surface of this attachment member is connected with the said main body rubber elastic body. 前記本体ゴム弾性体の前記大径部分側の軸方向外方には、該本体ゴム弾性体で壁部の一部が構成されて非圧縮性流体が封入されることにより、振動入力時に圧力変動が生ぜしめられる受圧室が形成されている請求項１〜８の何れか一項に記載の防振装置。   The main rubber elastic body is axially outward on the large-diameter portion side, and the main rubber elastic body forms a part of the wall portion and encloses an incompressible fluid. The vibration isolator as described in any one of Claims 1-8 in which the pressure receiving chamber in which is generated is formed. 前記第一の取付部材において、前記本体ゴム弾性体の小径側端部から軸方向内方に入り込んだ軸方向下方の端面が、軸直角方向に広がる平坦部を中央部分に有していると共に、該平坦部の外周が滑らかに湾曲して該第一の取付部材の外周面につながった外周面取り形状とされている請求項９に記載の防振装置。   In the first mounting member, the axially lower end surface that has entered the inner side in the axial direction from the small-diameter side end of the main rubber elastic body has a flat portion that extends in the direction perpendicular to the axis at the central portion, The vibration isolator according to claim 9, wherein the outer periphery of the flat portion is smoothly curved and connected to the outer peripheral surface of the first mounting member.
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