JP3893977B2

JP3893977B2 - Vibration isolator

Info

Publication number: JP3893977B2
Application number: JP2002002358A
Authority: JP
Inventors: 宏考村井; 高伸南野
Original assignee: Sumitomo Riko Co Ltd
Current assignee: Sumitomo Riko Co Ltd
Priority date: 2002-01-09
Filing date: 2002-01-09
Publication date: 2007-03-14
Anticipated expiration: 2022-01-09
Also published as: JP2003202053A

Description

【０００１】
【技術分野】
本発明は、防振装置に係り、特に防振されるべき二つの部材にそれぞれ取り付けられる第一及び第二の取付部材と、かかる第一及び第二の取付部材の間に介装されて、それらを弾性的に連結するゴム弾性体とを有する防振装置の改良された構造に関するものである。
【０００２】
【背景技術】
従来から、この種の防振装置の一種として、防振されるべき二つ部材にそれぞれ取り付けられた状態下で、径方向に離隔配置された内筒金具と外筒金具とをゴム弾性体にて連結してなる、所謂筒型マウントが知られており、これは、自動車のエンジンマウント等として、多く使用されてきている。
【０００３】
ところで、このような筒型マウントにおいては、一般に、ゴム弾性体が、内筒金具と外筒金具とに対して、それぞれ加硫接着せしめられるようになっているところから、内筒金具と外筒金具とを連結したゴム弾性体に、加硫後の収縮による引っ張り歪みが生じ、それが、ゴム弾性体の耐久性に悪影響を及ぼすことが避けられなかったのであり、それ故、かかるゴム弾性体の引っ張り歪みを解消して、耐久性の向上を図るために、自動車のエンジンとボデーとの間等に介装せしめる際に、先ず、外筒金具を絞り加工し、その後、ボデー等に固定されるリング状ブラケットに外筒金具を圧入するといった、面倒で、手間の掛かる作業を行なう必要があったのである。
【０００４】
かかる状況下、特開平８−２９６６８１号公報には、ゴム弾性体が、エンジン等に取り付けられる、剛性を有する内側部材の外周面のみに対して加硫接着されることにより、内側部材に連結される一方、そのような内側部材が加硫接着されたゴム弾性体が、自動車のボデー等に取り付けられる、剛性を有する外側部材に設けられた凹部内に嵌入せしめられた状態下において、かかる外側部材の凹部の底面とボデー等との間で挟持されることにより、外側部材に対して連結され、以て、内側部材と外側部材とが、それらの間に介装されたゴム弾性体により、弾性的に連結されるように構成された防振装置が、明らかにされている。
【０００５】
このような構造を有する防振装置にあっては、内側部材を取り囲むように位置して、内周面においてゴム弾性体に加硫接着される外筒部材が省略されているために、ゴム弾性体の加硫後の自由な収縮が可能となって、ゴム弾性体に引っ張り歪みが生ずるようなことが有利に回避され得、以て、かかる引っ張り歪みを除去するために従来行なわれていた外筒部材に対する絞り加工や、外筒部材のリング状ブラケットへの圧入作業を行なう必要が皆無ならしめられ得て、製造工程の簡略化が効果的に図られ得ることとなる。
【０００６】
しかしながら、本発明者等が、前記公報に開示されている如き構造の防振装置について、種々検討を加えたところ、かかる従来の防振装置の構造では、内側部材の外周面に加硫接着されて、内側部材への入力振動に対するばね部として機能するゴム弾性体部分が、外側部材とボデー等との間で挟持されて、かかるゴム弾性体部分に対して、所定の圧縮力が作用せしめられるようになっているため、ばね部として機能するゴム弾性体部分のばね特性を十分に柔らかく為すことが難しく、それ故に、防振性能の更なる向上を図ることが、極めて困難であることが、判明したのである。
【０００７】
【解決課題】
ここにおいて、本発明は、上述せる如き事情を背景にして為されたものであって、その解決課題とするところは、防振されるべき二つの部材にそれぞれ取り付けられる第一及び第二の取付部材が、それらの間に介装されるゴム弾性体にて弾性的に連結されてなる防振装置において、その製造工程を有利に簡略化することが出来、しかも、入力振動に対するばね部として機能するゴム弾性体部分のばね特性をより十分に柔らかく為して、防振性能の更なる向上を効果的に図り得るようにした新規な構造を提供することにある。
【０００８】
【解決手段】
そして、本発明にあっては、かかる課題の解決のために、防振されるべき二つの部材のうちの一方に取り付けられる第一の取付部材と、それらのうちの他方に取り付けられる第二の取付部材と、該第一の取付部材と該第二の取付部材との間に介装され、それらを弾性的に連結するゴム弾性体とを有する防振装置において、前記ゴム弾性体が、主たる振動入力方向において所定の高さを有するブロック形状を呈し、その基部に、該主たる振動入力方向に対して直角な左右方向の両側においてそれぞれ膨出する二つの肩部が設けられると共に、該基部から高さ方向に延び出す延出部位の基部側部分に、高さ方向と左右方向の両方に対して直角となる方向において該基部側部分を貫通して延びる肉抜空所と、該基部側部分の両側部にそれぞれ位置するように、該基部側部分における左右方向の寸法を該基部からの延出部位の先端側部分よりも小さく為す括れ部とが設けられてなり、前記第一の取付部材が、その一部において、前記ゴム弾性体の基部からの延出部位の先端側部分に、前記肉抜空所の貫通方向に沿って延びるように埋設された状態で、該ゴム弾性体に加硫接着されて、一体的に連結される一方、前記第二の取付部材が、前記ゴム弾性体の基部底面を除く側面及び先端面を取り囲むように屈曲形成されてなる、剛性を有する包囲部材を有し、且つかかる包囲部材が、該ゴム弾性体の前記基部に設けられた肩部に対応した屈曲形状の段部を有するように構成され、そして、該包囲部材が、前記ゴム弾性体の前記基部からの延出部位の左右両側面と先端面とに対して所定の距離を隔ててそれぞれ対向して、かかる延出部位を包囲しつつ、該包囲部材の段部において、該ゴム弾性体の前記二つの肩部を、該第二の取付部材が取り付けられる前記防振されるべき部材との間でそれぞれ挟圧、保持せしめることにより、該第二の取付部材が、該ゴム弾性体に連結されるように構成したことを特徴とする防振装置を、その要旨とするものである。
【０００９】
すなわち、かかる本発明に従う防振装置にあっては、防振されるべき二つ部材にそれぞれ取り付けられる第一及び第二の取付部材のうち、第一の取付部材だけが、その外周面において、ゴム弾性体に加硫接着されることにより、ゴム弾性体に対して一体的に連結される一方、第二の取付部材は、それを構成する包囲部材に設けられた段部において、ゴム弾性体に形成された二つの肩部を、第二の取付部材が取り付けられる防振されるべき部材との間でそれぞれ挟圧、保持することにより、ゴム弾性体に対して連結されるようになっていることによって、筒型マウント等の従来装置とは異なって、二つの取付部材のうちの一方たる内筒部材の径方向外側に位置して、内周面においてゴム弾性体に加硫接着される、二つの取付部材のうちの他方としての外筒部材が、有利に省略されているのである。
【００１０】
それ故、このような本発明に係る防振装置においては、ゴム弾性体の加硫後の自由な収縮が可能となって、ゴム弾性体に引っ張り歪みが生ずるようなことが有利に回避され得、それによって、かかる引っ張り歪みを除去して、ゴム弾性体の耐久性を確保するために従来行なわれていた外筒部材に対する絞り加工や、外筒部材のリング状ブラケットへの圧入作業を行なう必要が、効果的に皆無ならしめられ得るのである。
【００１１】
また、本発明に従う防振装置にあっては、ゴム弾性体が、主たる振動入力方向において所定の高さを有するブロック形状を呈し、その基部に、かかる主たる振動入力方向に対して直角な左右方向の両側においてそれぞれ膨出する二つの肩部が設けられ、そして、上述せるように、この二つの肩部が、第二の取付部材を構成する包囲部材の段部において、第二の取付部材が取り付けられる、防振されるべき部材との間でそれぞれ挟圧、保持されることにより、第二の取付部材がゴム弾性体に取り付けられている一方、第一の取付部材が、ゴム弾性体の基部から延び出す延出部位の先端側部分に埋設される状態で、ゴム弾性体に一体的に連結されているところから、ゴム弾性体において、第二の取付部材が取り付けられる基部に対しては、包囲部材の段部と防振されるべき部材との間にて及ぼされる挟圧力に基づく圧縮力が作用せしめられるものの、かかる基部から延び出す延出部位には、そのような圧縮力が、何等作用せしめられることがなく、従って、第一の取付部材が加硫接着されて、第一の取付部材と第二の取付部材間への入力振動に対するばね部として機能する延出部位のばね特性を十分に柔らかく為すことが出来るのである。
【００１２】
しかも、かかる本発明に従う防振装置においては、十分に柔らかいばね特性を発揮するゴム弾性体の延出部位の基部側部分に、高さ方向と左右方向の両方に対して直角となる方向において該基部側部分を貫通して延びる肉抜空所が設けられているため、例えば、自動車等への装着時に入力される初期荷重により、第一の取付部材がゴム弾性体の基部側方向に変位せしめられても、かかる変位量が肉抜空所にて有利に吸収され得、それによって、ゴム弾性体の上下方向における柔らかいばね特性が、有利に確保され得るのであり、また、そのような肉抜空所が設けられたゴム弾性体の延出部位の基部側部分に、該基部側部分の両側部にそれぞれ位置するように、該基部側部分における左右方向の寸法を延出部位の先端側部分よりも小さく為す括れ部が更に設けられているところから、自動車等への装着状態下において、ゴム弾性体の延出部位における左右方向のばね特性も、十分に柔らかく為され得るのである。
【００１３】
さらに、本発明に従う防振装置にあっては、第二の取付部材を構成する包囲部材が、剛性を有し、ゴム弾性体の二つの肩部に対応した屈曲形状の段部において、それら二つの肩部を、防振されるべき部材との間で挟圧、保持する一方で、ゴム弾性体の基部からの延出部位の左右両側面と先端面とに対して所定の距離を隔ててそれぞれ対向して、かかる延出部位を包囲するように位置せしめられているため、例えば、自動車等への装着状態下で、第一の取付部材のリバウンド方向（ゴム弾性体の延出部位の延出方向）への第二の取付部材に対する相対的変位量を、包囲部材における、ゴム弾性体の延出部位の先端面との対向部位において、かかる先端面との当接により規制することが出来、また、左右方向への振動入力に伴う第一の取付部材の第二の取付部材に対する左右方向への相対的変位量も、包囲部材における、ゴム弾性体の延出部位の左右両側面との対向部位において、それら両側面との当接により規制することが出来のである。それ故、かかる防振装置では、ゴム弾性体の基部からの延出部位の左右両側面及び先端面と包囲部材との間の距離を最適に設計すれば、第一の取付部材の第二の取付部材に対するリバウンド方向と左右方向への過剰な相対変位、ひいてはゴム弾性体の過大な弾性変形を阻止することが、可能となるのである。
【００１４】
従って、かくの如き本発明に従う防振装置にあっては、第一及び第二の取付部材の絞り加工や圧入作業を行なわない分だけ、製造工程が有利に簡略化され得るばかりでなく、入力振動に対するばね部として機能するゴム弾性体部分のばね特性がより一層十分に柔らかく為され得て、防振性能が飛躍的に高められ得るのであり、しかも、ゴム弾性体における引っ張り歪みの発生や第一の取付部材の第二の取付部材に対する過剰な相対変位が阻止され得ることにより、第一及び第二の取付部材の間に介装されて、それらを弾性的に連結するゴム弾性体、ひいては装置全体の使用耐久性の向上が、極めて効果的に図られ得ることとなるのである。
【００１５】
また、かかる本発明に従う防振装置においては、ゴム弾性体の基部からの延出部位における左右方向のばね特性が十分に柔らかく為され得ているところから、例えば、自動車のエンジンマウント等として使用する場合、ゴム弾性体の左右方向が自動車の前後方向となるようにして、自動車の装着すれば、エンジンのアイドリング振動等に対する防振効果が、より一層有利に発揮され得るといった利点が得られるのである。
【００１６】
ところで、本発明にあっては、防振されるべき二つの部材のうちの一方に取り付けられる第一の取付部材と、それらのうちの他方に取り付けられる第二の取付部材と、該第一の取付部材と該第二の取付部材との間に介装され、それらを弾性的に連結するゴム弾性体とを有する防振装置において、前記ゴム弾性体が、主たる振動入力方向において所定の高さを有するブロック形状を呈し、その基部に、該主たる振動入力に対して直角な方向左右方向の両側においてそれぞれ膨出する二つの肩部が設けられると共に、該基部から高さ方向に延び出す延出部位の基部側部分に、高さ方向と左右方向の両方に対して直角となる方向において該基部側部分を貫通して延びる肉抜空所と、該基部側部分の両側部にそれぞれ位置するように、該基部側部分における左右方向の寸法を該基部からの延出部位の先端側部分よりも小さく為す括れ部とが設けられてなり、前記第一の取付部材が、その一部において、前記ゴム弾性体の基部からの延出部位の先端側部分に、前記肉抜空所の貫通方向に沿って延びるように埋設された状態で、該ゴム弾性体に加硫接着されて、一体的に連結される一方、前記第二の取付部材が、前記ゴム弾性体の基部底面を除く側面及び先端面を取り囲むように屈曲形成されてなる、剛性を有する包囲部材と、該ゴム弾性体の基部底面に対応した形状部分を少なくとも有し、該包囲部材と協働して該ゴム弾性体を全周に亘って取り囲む底壁部材とを有し、且つかかる包囲部材が、該ゴム弾性体の前記基部に設けられた肩部に対応した屈曲形状の段部を有するように構成され、そして、前記ゴム弾性体がそれら包囲部材と底壁部材とによって取り囲まれた状態下において、該包囲部材が、該ゴム弾性体の前記基部からの延出部位の左右両側面と先端面とに対して所定の距離を隔ててそれぞれ対向して、かかる延出部位を包囲しつつ、該包囲部材の段部において、該ゴム弾性体の前記二つの肩部を、該底壁部材との間でそれぞれ挟圧、保持せしめることにより、該第二の取付部材が、該ゴム弾性体に連結されるようになっていることを特徴とする防振装置をも、また、その要旨とするものである。
【００１７】
要するに、この本発明に従う防振装置においては、第一の取付部材のみが、その外周面において、ゴム弾性体の基部からの延出部位の先端側部分に加硫接着されている一方、ゴム弾性体が、基部において、第二の取付部材を与える包囲部材と底壁部材との間で挟圧、保持されており、また、かかるゴム弾性体の延出部位の基部側部分に、肉抜空所と括れ部とが設けられ、しかも、包囲部材が、ゴム弾性体の延出部位を、その左右両側面と先端面とに対して所定の距離を隔てて対向する状態で包囲するように位置せしめられているのである。
【００１８】
従って、本発明に従う防振装置にあっても、製造工程が有利に簡略化され得ると共に、入力振動に対するばね部として機能するゴム弾性体部分のばね特性がより一層十分に柔らかく為され得て、防振性能が飛躍的に高められ得るのであり、更に、ゴム弾性体における引っ張り歪みの発生や第一の取付部材の第二の取付部材に対する過剰な相対変位が阻止され得て、ゴム弾性体、ひいては装置全体の使用耐久性の向上が、極めて効果的に図られ得ることとなるのである。
【００１９】
そして、かかる本発明に従う防振装置においては、特に、第二の取付部材が、包囲部材の他に、ゴム弾性体の基部底面に対応した形状部分を少なくとも有し、包囲部材と協働して、ゴム弾性体を全周に亘って取り囲む底壁部材を含んで構成され、ゴム弾性体が、それら包囲部材と底壁部材とによって取り囲まれた状態下において、ゴム弾性体の二つの肩部が、包囲部材と底壁部材との間でそれぞれ挟圧、保持されることにより、第二の取付部材が、ゴム弾性体に連結されるようになっているところから、第一の取付部材と第二の取付部材とがゴム弾性体にて連結せしめられて組み付けられた一体的な組付品として取り扱われ得るのであり、それによって、より優れた取扱性が発揮され得て、例えば、自動車等への組付性が飛躍的に高められ得ることとなるのである。
【００２０】
なお、このような本発明に従う防振装置の好ましい態様の一つによれば、前記ゴム弾性体の基部底面に、嵌合凹所が設けられる一方、前記底壁部材に、該嵌合凹所内に突入して、嵌合可能な嵌合凸部が設けられ、該ゴム弾性体が全周に亘って前記包囲部材と該底壁部材とによって取り囲まれた状態下で、該ゴム弾性体の嵌合凹所内に、該底壁部材に設けられた前記嵌合凸部が突入して、嵌合せしめられるように構成される。
【００２１】
かかる構成を有する防振装置においては、嵌合凹所を嵌合凸部とを、ゴム弾性体の基部底面と底壁部材とに対して、それぞれ一定の位置に設けるようにすれば、ゴム弾性体を、包囲部材と底壁部材とによって取り囲んだ際に、常に一定の位置に位置せしめることが出来、以てその位置決めが容易となるのである。
【００２２】
また、本発明に従う防振装置の別の有利な態様の一つによれば、前記ゴム弾性体が前記包囲部材と前記底壁部材とによって取り囲まれた状態下で、該ゴム弾性体の前記基部の左右方向とは直角な厚さ方向における二つの側面にそれぞれ接触して、該ゴム弾性体の左右方向とは直角な厚さ方向への移動を規制する規制壁部が、該ゴム弾性体の基部を挟むようにして、該底壁部材に設けられることとなる。
【００２３】
このような構成を有する防振装置にあっては、例えば、自動車等に装着された状態下において、振動入力に伴う第一の取付部材の第二の取付部材に対する左右方向とは直角な方向への相対変位が阻止されて、かかる方向への相対変位に起因するゴム弾性体の包囲部材と底壁部材との間からの離脱が効果的に防止され得るのであり、それによって、防振性能が安定的に確保され得ると共に、装置全体の使用耐久性が、より有利に高められ得ることとなるのである。
【００２４】
さらに、本発明に従う防振装置の望ましい他の態様の一つによれば、前記第一の取付部材が、前記ゴム弾性体への埋設部位において、左右方向の両側に向かってそれぞれ延出する突出部を有して構成される。
【００２５】
このような構成を有する防振装置においては、例えば、自動車等への装着状態下における、第一の取付部材のリバウンド方向（ゴム弾性体の延出部位の延出方向）への第二の取付部材に対する相対変位時に、包囲部材におけるゴム弾性体の延出部位の先端面との対向部位が、ゴム弾性体の延出部位の先端側部分を介して、剛性を有する第一の取付部材の突出部に当接せしめられることとなり、それによって、第一の取付部材のリバウンド方向への過剰な相対変位が、より確実に阻止され得るのである。
【００２６】
また、本発明に従う防振装置の別の有利な態様の一つによれば、前記包囲部材が、前記ゴム弾性体の前記基部からの延出部位の先端面に対向する、前記左右方向に延びる平坦な天井壁部と、該天井壁部の左右方向両端部から前記高さ方向にそれぞれ垂下する、前記ゴム弾性体の前記基部からの延出部位の左右両側面にそれぞれ対向した側壁部の二つとを有して、構成される。
【００２７】
このような構成を有する防振装置にあっては、第一の取付部材の第二の取付部材に対するリバウンド方向と左右方向への過剰な相対変位を阻止するストッパとしての機能が、包囲部材において、比較的な簡略な構造により、更に一層確実に発揮され得ることとなるのである。
【００２８】
【発明の実施の形態】
以下、本発明を更に具体的に明らかにするために、本発明に係る防振装置の構成について、図面を参照しつつ、詳細に説明することとする。
【００２９】
先ず、図１乃至図３には、本発明に従う構造を有する防振装置の一実施形態として、主たる振動が上下方向に入力せしめられるＦＦ型自動車用のエンジンマウントが、その正面形態と上面形態と縦断面形態とにおいて、それぞれ、概略的に示されている。それらの図から明らかなように、本実施形態のエンジンマウント１０は、第一の取付部材としての内側金具１２と第二の取付部材としての外側金具１４が、所定距離を隔てて配設されて、それら両金具１２，１４間に介装されたゴム弾性体１６によって弾性的に連結されており、内側金具１２と外側金具１４とが、図示しないパワーユニットとボデーとに対して固定的に取り付けられることにより、パワーユニットをボデーに対して防振支持せしめるようになっている。
【００３０】
より詳細には、内側金具１２は、全体として、厚肉の略小径円筒形状を有している。また、この内側金具１２にあっては、その軸方向の中間部に、筒壁部が径方向外方に膨らみ出すようにして、左右方向に向かってそれぞれ延出せしめられてなる突出部１８が、設けられており、この突出部１８の上面と下面とが、それぞれ平面形態を有する平面部２０とされている。
【００３１】
一方、このような内側金具１２と前記外側金具１４との間に介装されるゴム弾性体１６は、エンジンマウント１０の自動車への装着状態下で、主たる振動入力方向となる上下方向において所定の高さを有し、且つかかる主たる振動入力方向に対して直角な左右方向たる幅方向（図１における左右方向に相当する方向）の寸法が、高さ方向（上下方向）と幅方向の両方に対して直角な方向となる厚さ方向（図１における紙面に垂直な方向に相当する方向）の寸法よりも十分に大きくされた、全体として、略矩形のブロック形状を有して、構成されている。
【００３２】
そして、かかるゴム弾性体１６にあっては、その下側端部となる基部２２に、幅方向（左右方向）の両側においてそれぞれ膨出して、該基部２２の幅を、基部２２から上方に延び出す延出部位２４の幅よりも大きく為す二つの肩部２６，２６が、それぞれ形成されている。また、このゴム弾性体１６の基部２２の底面には、その略中央に、矩形穴形態を呈する嵌合凹所２８が、基部２２に設けられた各肩部２６の高さと略同一の深さをもって、形成されている。
【００３３】
さらに、ゴム弾性体１６の高さ方向の中間部分、つまり基部２２からの延出部位２４の基部２２側部分における幅方向の中央部には、肉抜空所３０が、設けられている。この肉抜空所３０は、略三角形状の内周面形状を有し、ゴム弾性体１６の高さ方向と幅方向の両方に対して直角となる方向、つまり厚さ方向において、該延出部位２４の基部２２側部分を貫通して延びる形態をもって構成されている。つまり、ここでは、かかる肉抜空所３０の存在によって、ゴム弾性体１６の基部２２からの延出部位２４の基部２２側部分における幅方向の中央部が、略三角形状をもって、ゴム弾性体１６の厚さ方向に連続的に刳り抜かれているのである。
【００３４】
また、このような肉抜空所３０が設けられたゴム弾性体１６の延出部位２４の基部２２側部分における幅方向の両側側面には、それぞれ凹み部分が形成されており、この凹み部分が、該基部２２側部分の幅を、ゴム弾性体１６の延出部位２４の先端側部分の幅よりも小さく為す括れ部３２とされているのである。
【００３５】
さらに、ゴム弾性体１６においては、基部２２からの延出部位２４の先端面における幅方向の中央部に、該先端面を二つの平面に分割する溝部３４が、ゴム弾性体１６の厚さ方向における二つの側面のうちの一方から他方に向かって連続して延びるように、形成されている。
【００３６】
そして、前記内側金具１２が、かくの如き構成とされたゴム弾性体１６における基部２２からの延出部位２４の先端側部分に、該延出部位２４に設けられた肉抜空所３０の貫通方向となる厚さ方向に沿って延出しつつ、軸方向の中間部に設けられた突出部１８において埋設され、且つ軸方向の両端部を外方に突出させた状態で、かかるゴム弾性体１６に加硫接着されて、一体的に連結されている。つまり、ここでは、ゴム弾性体１６が、基部２２からの延出部位２４の先端側部分に対して、内側金具１２が、その軸方向の中間部の外周面において加硫接着された一体加硫成形品とされているのである。
【００３７】
一方、外側金具１４は、包囲部材としての包囲金具３６と、底壁部材としての底壁金具３８とを、更に有している。そして、それら両金具３６，３８のうち、包囲金具３６は、長手矩形の金属板材を、長手方向の中間部分において、厚さ方向にコ字状に屈曲せしめてなる如き形態を有しており、その長手方向の中間部分が、天井壁部４３と、該天井壁部４３の左右方向両端部からそれぞれ垂直な方向延びる二つの側壁部４４，４４とを有するコ字状部４０とされている一方、その両端部が、取付フランジ部４２とされている。また、この包囲金具３６においては、コ字状部４０が、ゴム弾性体１６の基部２２からの延出部位２４における幅方向の両側側面と先端面を、非接触下で取り囲み得る大きさとされていると共に、各側壁部４４，４４の天井壁部４３とは反対側の端部に、ゴム弾性体１６の基部２２に設けられた二つの肩部２６に対応した屈曲形状を呈する段部４６，４６が、それぞれ設けられて、構成されている。
【００３８】
さらに、かかる包囲金具３６と共に外側金具１４を構成する底壁金具３８は、全体として、略長手矩形の平板形状を有しており、その長手方向の両端部が、包囲金具３６の取付フランジ部４２に対応した取付片部４８とされている一方、長手方向の中間部が、ゴム弾性体１６の基部２２の底面に対応した形状と、包囲金具３６のコ字状部４０の開口部分を閉塞可能な大きさとを有する底壁部５０とされている。また、この底壁金具３８の底壁部５０の中央部分には、ゴム弾性体１６の基部２２の底面に設けられた前記嵌合凹所２８に突入して、嵌合可能な嵌合凸部５２が、突出形成されている。
【００３９】
更にまた、底壁金具３８にあっては、その幅方向（図３における左右方向）の両側に、後述する如き底壁金具３８のゴム弾性体１６との組付け状態下において、ゴム弾性体１６の基部２２における厚さ方向（図３における左右方向）の二つの側面にそれぞれ接触する竪壁部５４，５４が、ゴム弾性体１６の基部２２と略同様な高さと、該基部２２の幅よりも大きな長さとをもって、一体的に立設されている。
【００４０】
そして、ここでは、このような外側金具１４の包囲金具３６が、ゴム弾性体１６をコ字状部４０内に収容せしめた状態下で、かかるコ字状部４０の天井壁部４３と二つの側壁部４４，４４とにおいて、ゴム弾性体１６における、内側金具１２が加硫接着された延出部位２４の先端面と幅方向の両側側面とに対して、所定距離を隔てて、それぞれ対向しつつ、かかる延出部位２４を包囲すると共に、二つの段部４６，４６において、ゴム弾性体１６における基部２２に設けられた二つの肩部２６，２６に接触して、位置せしめられている。また、外側金具１４の底壁金具３８は、底壁部５０において、包囲金具３６のコ字状部４０の開口部を閉塞し、且つコ字状部４０内に収容位置せしめられたゴム弾性体１６の基部２２の底面に接触すると共に、かかる底壁部５０の二つの竪壁部５４，５４の間に、ゴム弾性体１６の基部２２が、各竪壁部５４，５４に接触して、挟まれるように位置せしめられている。
【００４１】
かくして、外側金具１４の包囲金具３６と底壁金具３８とが、協働して、ゴム弾性体１６を全周に亘って取り囲んだ状態下で、包囲金具３６の各段部２６，２６と底壁金具３８の底壁部５０との間で、ゴム弾性体１６の基部２２における二つの肩部２６，２６をそれぞれ挟圧、保持せしめると共に、底壁金具３８の各竪壁部５４，５４に対するゴム弾性体１６の基部２２の接触により、ゴム弾性体１６の厚さ方向への移動を阻止せしめるように配置され、そして、そのような配置状態下において、包囲金具３６の各取付フランジ部４２，４２と底壁金具３８の各取付片部４８，４８とが、互い重ね合わされて、リベット止めされている。このことから明らかなように、本実施形態では、竪壁部５４，５４にて、規制壁部が構成されている。
【００４２】
これによって、本実施形態では、外側金具１４が、内側金具１２が加硫接着されたゴム弾性体１６に連結され、以て、内側金具１２と外側金具１４とが、それらの間に介装されたゴム弾性体１６にて、弾性的に連結されるようになっているのである。そして、それらゴム弾性体１６を介して連結された筒状の内側金具１２の内孔内に、パワーユニットに固定された所定の軸部材（図示せず）が挿入、固定される一方、外側金具１４における包囲金具３６の各取付フランジ部４２，４２と底壁金具３８の各取付片部４８，４８とに、それぞれ対応位置して設けられた各取付孔５６，５８に、図示しない取付ボルトが挿通されて、この取付ボルトが、ボデー側に固定されることによって、本実施形態のエンジンマウント１０が、自動車に装着されるようになっているのである。
【００４３】
このように、本実施形態のエンジンマウント１０においては、ゴム弾性体１６に対して、内側金具１２だけが、その外周面において加硫接着されるようになっているところから、ゴム弾性体１６の加硫後の自由な収縮が可能となって、ゴム弾性体１６に引っ張り歪みが生ずるようなことが有利に回避され得、それによって、そのような引っ張り歪みを除去して、ゴム弾性体１６の耐久性を確保するために従来行なわれていた外筒部材の絞り加工や圧入作業を行なう必要が、効果的に皆無ならしめられ得るのである。そして、その結果として、それらの面倒な作業を行なわない分だけ、製造工程の簡略化が極めて有利に図られ得るのである。
【００４４】
また、本実施形態のエンジンマウント１０にあっては、ゴム弾性体１６が、その基部２２において、外側金具１４における包囲金具３６の各段部４６，４６と、底壁金具３８の底壁部５０との間で挟圧、保持されることにより、外側金具１４がゴム弾性体１６に連結される一方、内側金具１２が、ゴム弾性体１６の基部２２からの延出部位２４の先端側部分に埋設される状態で、加硫接着されることにより、ゴム弾性体１６に連結されるようになっているため、外側金具１４が連結されるゴム弾性体１６の基部２２に対しては、包囲金具３６の各段部４６，４６と底壁金具３８の底壁部５０との間において及ぼされる挟圧力に基づく圧縮力が作用せしめられるものの、ゴム弾性体１６の基部２２からの延出部位２４には、そのような圧縮力が、何等作用せしめられることがないのである。
【００４５】
それ故、このようなエンジンマウント１０においては、内側金具１２が加硫接着されて、内側金具１２と外側金具１４間への入力振動に対するばね部として機能する、ゴム弾性体１６の延出部位のばね特性が、十分に柔らかく為され得るのである。
【００４６】
しかも、本実施形態のエンジンマウント１０においては、ゴム弾性体１６の基部２２からの延出部位２４に、それを厚さ方向に貫通して延びる肉抜空所３０と、かかる延出部位２４の幅を小さく為す括れ部３２とが設けられているところから、自動車への装着により、初期荷重が入力せしめられた状態下でも、ゴム弾性体１６の上下方向におけるばね特性と、幅方向におけるばね特性とが、何れも、十分に柔らかく為され得るのである。
【００４７】
従って、かくの如き本実施形態に係るエンジンマウント１０にあっては、入力振動に対するばね部として機能するゴム弾性体１６の基部２２からの延出部位２４のばね特性が、更に一層十分に柔らかく為され得て、より優れた防振性能が、極めて効果的に発揮され得ることとなるのである。そして、この本実施形態のエンジンマウント１０を、ゴム弾性体１６の幅方向とボデーの前後方向とが一致するように自動車に装着した場合、ゴム弾性体１６の幅方向におけるばね特性が十分に柔らかく為され得ていることによって、エンジンのアイドリング振動等に対する防振効果が、より一層有利に高められ得るのである。
【００４８】
また、本実施形態のエンジンマウント１０では、上述の如き柔らかいばね特性を発揮するゴム弾性体１６の延出部位２４における先端面と幅方向の両側側面とが、外側金具１４の包囲金具３６におけるコ字状部４０の天井壁部４３と側壁部４４，４４とに対して、所定の距離を隔てて対向しつつ、包囲されるようになっているところから、入力振動によって、内側金具１２が、外側金具１４に対して、上下方向や左右方向（ゴム弾性体１６の幅方向）に相対変位せしめられる際にも、かかる包囲金具３６の天井壁部４３と側壁部４４，４４とに対する延出部位２４の当接により、過剰な相対変位が惹起されるようなことが、有利に防止され得るのであり、その結果として、ゴム弾性体１６、ひいてはエンジンマウント１０全体の使用耐久性の向上が、効果的に図られ得ることとなるのである。
【００４９】
さらに、本実施形態のエンジンマウント１０においては、ゴム弾性体１６が、その基部２２において、外側金具１４の包囲金具３６と底壁金具３８との間で挟圧、保持されることにより、外側金具１４がゴム弾性体１６に連結される一方、内側金具１２が、ゴム弾性体１６の基部２２からの延出部位２４の先端側部分に埋設される状態で、加硫接着されることにより、ゴム弾性体１６に連結されるようになっているため、自動車への装着前の状態下で、内側金具１２と外側金具１４とがゴム弾性体１６にて連結せしめられてなる一体的な組付品として取り扱われ得るのであり、それによって、より優れた取扱性が発揮され得て、自動車への組付性が、飛躍的に高められ得ることとなるのである。
【００５０】
また、本実施形態のエンジンマウント１０にあっては、ゴム弾性体１６の基部２２の底面に、嵌合凹所２８が設けられる一方、外側金具１４の底壁金具３８における底壁部５０に、かかる嵌合凹所２８に突入して、嵌合する嵌合凸部５２が設けられているため、それら嵌合凹所２８と嵌合凸部５２との凹凸嵌合により、ゴム弾性体１６を、底壁金具３８に対して、常に一定の位置で組み付けることが可能となり、以て、外側金具１４のゴム弾性体１６への連結時における位置決めが、容易となるのである。
【００５１】
さらに、かかるエンジンマウント１０では、外側金具１４の底壁金具３８に、竪壁部５４，５４が設けられ、外側金具１４をゴム弾性体１６に組み付けた状態下において、ゴム弾性体１６の厚さ方向への移動が、かかる竪壁部５４，５４にて阻止されるようになっているところから、自動車に装着された状態下で、内側金具１２の外側金具１４に対するゴム弾性体１６の厚さ方向への相対移動が規制され、それによって、内側金具１２が加硫接着され、且つ外側金具１４における包囲金具３６と底壁金具３８とにて取り囲まれたゴム弾性体１６が、内側金具１２の外側金具１４に対する相対移動に起因して、それら包囲金具３６と底壁金具３８との間から離脱せしめられるようなことが有利に防止され得るのであり、その結果、防振性能が安定的に確保され得ると共に、装置全体の使用耐久性が有利に高められ得ることとなるのである。
【００５２】
更にまた、本実施形態のエンジンマウント１０にあっては、ゴム弾性体１６の基部２２からの延出部位２４の先端側部位に埋設されるようにして、加硫接着される内側金具１２において、ゴム弾性体１６に対する接着部分（埋設部分）に、ゴム弾性体１６の幅方向に延出し、上面が平坦面部２０とされた突出部１８が設けられているため、自動車への装着下で、内側金具１２の外側金具１４に対するリバウンド方向への相対変位が生ぜしめられた際に、外側金具１４の包囲金具３６におけるコ字状部４０の天井壁部４３が、ゴム弾性体１６の延出部位２４の先端側部分を介して、内側金具１２の突出部１８の平坦面部２０に当接せしめられることとなり、それによって、内側部材１２のリバウンド方向への過剰な相対変位が、より確実に阻止され得るのである。
【００５３】
また、本実施形態に係るエンジンマウント１０においては、ゴム弾性体１６の延出部位２４の先端面に溝部３４が設けられて、かかる先端面が、二つの平面に分割されるようになっているため、上述の如く、内側金具１２の外側金具１４に対するリバウンド方向への相対変位が生ぜしめられた際に、ゴム弾性体１６の延出部位２４の先端面が、それに対向する包囲金具３６のコ字状部４０の天井壁部４３に対して、より安定的に接触せしめられ得、これによっても、内側部材１２のリバウンド方向への過剰な相対変位が、より確実に阻止され得ることとなるのである。
【００５４】
さらに、本実施形態のエンジンマウント１０にあっては、溶接による接合部位が何等存在しないため、溶接時の熱歪みの発生に伴う強度の低下が有利に皆無ならしめられ得て、装置全体の耐久性が、効果的に高められ得るのである。
【００５５】
以上、本発明の具体的な構成について詳述してきたが、これはあくまでも例示に過ぎないものであって、本発明は、上記の記載によって、何等の制約をも受けるものではない。
【００５６】
例えば、前記実施形態では、内側金具１２が、略円筒状の全体形状を有していたが、パワーユニットやボデー等の防振されるべき部材に取り付けられ得るものであり、且つゴム弾性体に埋設されるように加硫接着され得るものであれば、その形状が、何等これに限定されるものではないのである。
【００５７】
また、外側金具１４の包囲金具３６と底壁金具３８のそれぞれの形状も、前記実施形態に示されるものに、特に限定されるものではないことは、言うまでもないところである。
【００５８】
さらに、前記実施形態では、外側金具１４が、包囲金具３６と底壁金具３８とから構成され、それらが協働して、ゴム弾性体１６を取り囲んだ状態で、それら包囲金具３６と底壁金具３８との間で、ゴム弾性体１６の二つの肩部２６，２６がそれぞれ挟圧、保持されるようになっていたが、外側金具１４を包囲金具３６のみにて構成して、ゴム弾性体１６を、かかる包囲金具３６のコ字状部４０にて包囲しつつ、各肩部２６，２６を、包囲金具３６の段部４６，４６と、包囲金具３６が取り付けられるボデー等との間で挟圧、保持せしめるようにすることも、可能である。これによって、エンジンマウント１０の部品点数を有利に削減することが出来、以て、コストの低下と製造工程の更なる簡略化とが、効果的に実現され得るのである。
【００５９】
加えて、前記実施形態では、本発明を、主たる振動が上下方向に入力せしめられるＦＦ型自動車用のエンジンマウントに適用したものの具体例を示したが、本発明は、その他、ＦＦ型以外の自動車用エンジンマウントや、エンジンマウント以外の自動車用防振装置、或いは自動車以外の防振装置の何れに対しても、有利に適用され得ることは、勿論である。
【００６０】
その他、一々列挙はしないが、本発明は、当業者の知識に基づいて種々なる変更、修正、改良等を加えた態様において実施され得るものであり、また、そのような実施態様が、本発明の趣旨を逸脱しない限り、何れも、本発明の範囲内に含まれるものであることは、言うまでもないところである。
【００６１】
【発明の効果】
以上の説明からも明らかなように、本発明に従う防振装置にあっては、製造工程が有利に簡略化され得るばかりでなく、入力振動に対するばね部として機能するゴム弾性体部分のばね特性がより一層十分に柔らかく為され得て、防振性能が飛躍的に高められ得るのであり、しかも、ゴム弾性体、ひいては装置全体の使用耐久性の向上が、極めて効果的に図られ得ることとなるのである。
【図面の簡単な説明】
【図１】本発明に従う構造を有するエンジンマウントの一例を示す正面説明図である。
【図２】図１における上面説明図である。
【図３】図１におけるIII−III断面説明図である。
【符号の説明】
１０エンジンマウント１２内側金具
１４外側金具１６ゴム弾性体
１８突出部２２基部
２４延出部位２６肩部
２８嵌合凹所３０肉抜空所
３２括れ部３６包囲金具
３８底壁金具４０コ字状部
４３天井壁部４４側壁部
４６段部５０底壁部
５２嵌合凸部５４竪壁部[0001]
【Technical field】
The present invention relates to a vibration isolator, in particular, a first and a second attachment member respectively attached to two members to be vibration-isolated, and interposed between the first and second attachment members, The present invention relates to an improved structure of a vibration isolator having a rubber elastic body for elastically connecting them.
[0002]
[Background]
Conventionally, as one type of this type of vibration isolator, an inner cylinder bracket and an outer cylinder bracket that are spaced apart from each other in a radial direction are attached to a rubber elastic body in a state where they are respectively attached to two members to be isolated. A so-called cylindrical mount is known, which has been widely used as an automobile engine mount or the like.
[0003]
By the way, in such a cylindrical mount, generally, the rubber elastic body is vulcanized and bonded to the inner cylinder fitting and the outer cylinder fitting, respectively. The rubber elastic body connected with the metal fitting is subject to tensile strain due to shrinkage after vulcanization, and this has inevitably adversely affected the durability of the rubber elastic body. In order to eliminate the tensile strain and improve durability, when installing between the engine and the body of the car, the outer cylinder fitting is first drawn and then fixed to the body etc. It was necessary to perform troublesome and time-consuming work such as press-fitting outer cylinder fittings into the ring-shaped bracket.
[0004]
Under such circumstances, JP-A-8-296681 discloses that a rubber elastic body is vulcanized and bonded only to the outer peripheral surface of a rigid inner member attached to an engine or the like, thereby being connected to the inner member. On the other hand, under such a condition that the rubber elastic body to which such an inner member is vulcanized and attached is fitted into a recess provided in a rigid outer member that is attached to an automobile body or the like. It is connected to the outer member by being sandwiched between the bottom surface of the concave portion and the body, etc., so that the inner member and the outer member are elasticized by the rubber elastic body interposed therebetween. An anti-vibration device configured to be coupled together is disclosed.
[0005]
In the vibration isolator having such a structure, the outer cylinder member that is positioned so as to surround the inner member and is vulcanized and bonded to the rubber elastic body on the inner peripheral surface is omitted. It is possible to freely contract the body after vulcanization and to advantageously avoid the occurrence of tensile strain in the rubber elastic body. It is possible to eliminate the necessity of drawing the cylinder member and press-fitting the outer cylinder member into the ring-shaped bracket, and the manufacturing process can be simplified effectively.
[0006]
However, the present inventors have made various studies on the vibration isolator having the structure as disclosed in the above publication, and in the structure of the conventional vibration isolator, vulcanization adhesion is performed on the outer peripheral surface of the inner member. The rubber elastic body portion that functions as a spring portion against the input vibration to the inner member is sandwiched between the outer member and the body, and a predetermined compressive force is applied to the rubber elastic body portion. Therefore, it is difficult to make the spring characteristics of the rubber elastic body part functioning as a spring part sufficiently soft, and therefore it is extremely difficult to further improve the vibration proof performance. It turns out.
[0007]
[Solution]
Here, the present invention has been made in the background as described above, and the problem to be solved is the first and second attachments respectively attached to the two members to be vibrated. In a vibration isolator in which members are elastically connected by a rubber elastic body interposed between them, the manufacturing process can be advantageously simplified, and it functions as a spring portion against input vibration. An object of the present invention is to provide a novel structure in which the spring characteristics of the rubber elastic body portion to be made are sufficiently softened so that the vibration-proof performance can be further improved effectively.
[0008]
[Solution]
And in this invention, in order to solve this subject, the 1st attachment member attached to one of the two members which should be vibrated, and the 2nd attached to the other of them In the vibration isolator having a mounting member and a rubber elastic body interposed between the first mounting member and the second mounting member and elastically connecting them, the rubber elastic body is mainly used. It has a block shape having a predetermined height in the vibration input direction, and has two shoulder portions that bulge on both sides in the left-right direction perpendicular to the main vibration input direction at the base, and from the base The base side portion of the extending portion extending in the height direction extends through the base side portion in a direction perpendicular to both the height direction and the left-right direction, and the base side portion Located on both sides of the As described above, a constricted portion is provided to make the size in the left-right direction of the base side portion smaller than the tip side portion of the portion extending from the base, and the first mounting member is, in part, The rubber elastic body is vulcanized and bonded to the rubber elastic body in a state where the rubber elastic body is embedded in the front end side portion of the portion extending from the base portion so as to extend along the penetration direction of the empty space. The second mounting member has a rigid surrounding member formed so as to bend so as to surround the side surface and the front end surface of the rubber elastic body except the base bottom surface, and the surrounding member. Is configured to have a bent step corresponding to a shoulder provided at the base of the rubber elastic body, and the surrounding member is a portion of the rubber elastic body extending from the base. A predetermined distance from the left and right side surfaces and the tip surface The two elastic members are attached to the two shoulders of the rubber elastic body at the stepped portion of the surrounding member so as to surround the extension portion and to be isolated from each other. The gist of the vibration isolating device is characterized in that the second mounting member is connected to the rubber elastic body by holding and holding each of the members with the rubber elastic body. is there.
[0009]
That is, in the vibration isolator according to the present invention, of the first and second attachment members respectively attached to the two members to be vibration-isolated, only the first attachment member is on the outer peripheral surface thereof. By being vulcanized and bonded to the rubber elastic body, the rubber elastic body is integrally connected to the rubber elastic body, while the second mounting member is a rubber elastic body at the step provided on the surrounding member constituting the second mounting member. The two shoulder portions formed on the two are connected to the rubber elastic body by holding and holding each of the two shoulder portions with the member to be damped to which the second mounting member is attached. Therefore, unlike conventional devices such as a cylindrical mount, it is positioned on the radially outer side of the inner cylindrical member which is one of the two mounting members, and is vulcanized and bonded to the rubber elastic body on the inner peripheral surface. , With the other of the two mounting members Outer tubular member of Te is than are omitted advantageously.
[0010]
Therefore, in such a vibration isolator according to the present invention, the rubber elastic body can be freely contracted after vulcanization, and it is possible to advantageously avoid the occurrence of tensile strain in the rubber elastic body. Therefore, it is necessary to perform drawing processing on the outer cylinder member and press-fitting of the outer cylinder member into the ring-shaped bracket, which are conventionally performed in order to remove such tensile strain and ensure the durability of the rubber elastic body. But it can be effectively eliminated.
[0011]
Further, in the vibration isolator according to the present invention, the rubber elastic body has a block shape having a predetermined height in the main vibration input direction, and a right and left direction perpendicular to the main vibration input direction at the base thereof Two shoulder portions are provided on each side of the surrounding member, and as described above, the two shoulder portions are provided at the stepped portion of the surrounding member constituting the second attachment member. The second mounting member is attached to the rubber elastic body by being clamped and held between the member to be attached and the vibration-proof member, while the first mounting member is attached to the rubber elastic body. In the state embedded in the front end portion of the extending portion extending from the base, and integrally connected to the rubber elastic body, in the rubber elastic body, for the base to which the second mounting member is attached Siege Although a compressive force based on the clamping pressure exerted between the step portion of the metal and the member to be damped is applied, no such compressive force is applied to the extending portion extending from the base portion. Therefore, the first mounting member is vulcanized and bonded, so that the spring characteristic of the extending portion that functions as a spring portion against the input vibration between the first mounting member and the second mounting member is sufficiently obtained. You can do it softly.
[0012]
In addition, in the vibration isolator according to the present invention, the base portion of the extending portion of the rubber elastic body exhibiting sufficiently soft spring characteristics is in the direction perpendicular to both the height direction and the left-right direction. Since a hollow space extending through the base side portion is provided, for example, the first mounting member is displaced in the base side direction of the rubber elastic body due to an initial load input when being mounted on an automobile or the like. However, such a displacement amount can be advantageously absorbed in the empty space, whereby a soft spring characteristic in the vertical direction of the rubber elastic body can be advantageously ensured. The left and right dimensions of the base side portion are set to the base side portion of the extension portion of the rubber elastic body provided with the voids, so that they are located on both sides of the base side portion, respectively. Smaller than From where part is further provided, under the mounted state of the automobile or the like, the spring characteristic of the horizontal direction of the extending portion of the rubber elastic body is also as it can be made sufficiently soft.
[0013]
Furthermore, in the vibration isolator according to the present invention, the surrounding member constituting the second mounting member has rigidity, and in the bent step portion corresponding to the two shoulder portions of the rubber elastic body, the two While holding and holding the two shoulders with the member to be vibration-isolated, a predetermined distance is provided between the left and right side surfaces of the extension part from the base of the rubber elastic body and the front end surface. Since each of them is positioned so as to surround the extending part, for example, in the mounted state in an automobile or the like, the rebound direction of the first mounting member (the extension of the extending part of the rubber elastic body) The amount of relative displacement with respect to the second mounting member in the (exiting direction) can be regulated by contact with the front end surface of the surrounding member at the front end surface of the rubber elastic body extension portion. In addition, the first mounting member accompanying vibration input in the left-right direction The amount of relative displacement in the left-right direction with respect to the second mounting member can also be regulated by contacting the both sides of the surrounding member of the surrounding member with the left and right sides of the rubber elastic body extension. is there. Therefore, in such a vibration isolator, if the distance between the left and right side surfaces and the front end surface of the rubber elastic body and the surrounding surface is optimally designed, the second of the first mounting member It is possible to prevent excessive relative displacement in the rebound direction and the left-right direction with respect to the mounting member, and thus excessive elastic deformation of the rubber elastic body.
[0014]
Therefore, in the vibration isolator according to the present invention as described above, not only the drawing process and the press-fitting work of the first and second mounting members can be advantageously simplified, but also the input process can be simplified. The elastic characteristic of the rubber elastic body part that functions as a spring part against vibration can be made sufficiently soft, and the vibration-proof performance can be dramatically improved. An excessive relative displacement of one mounting member with respect to the second mounting member can be prevented, so that a rubber elastic body interposed between the first and second mounting members and elastically connecting them, and thus The use durability of the entire apparatus can be improved extremely effectively.
[0015]
Further, in the vibration isolator according to the present invention, since the spring characteristic in the left-right direction at the portion extending from the base portion of the rubber elastic body can be made sufficiently soft, it is used as, for example, an engine mount of an automobile. In this case, if the rubber elastic body is mounted in the vehicle so that the left-right direction of the rubber elastic body is the front-rear direction of the vehicle, there is an advantage that the anti-vibration effect against idling vibration of the engine can be exhibited more advantageously. .
[0016]
By the way, in the present invention, the first attachment member attached to one of the two members to be damped, the second attachment member attached to the other of them, the first In the vibration isolator having a rubber elastic body interposed between the mounting member and the second mounting member and elastically connecting them, the rubber elastic body has a predetermined height in the main vibration input direction. The base portion is provided with two shoulder portions that bulge on both sides in the left-right direction in a direction perpendicular to the main vibration input, and an extension extending in the height direction from the base portion. The base side portion of the part is located on the both sides of the base side portion and the empty space extending through the base side portion in the direction perpendicular to both the height direction and the left-right direction. In the base side part And a constricted portion for making the horizontal dimension smaller than the distal end side portion of the portion extending from the base portion, and the first mounting member, in part, from the base portion of the rubber elastic body The rubber elastic body is vulcanized and bonded to the distal end portion of the extending portion so as to extend along the penetration direction of the meat emptying space, and is integrally connected. A second mounting member is formed so as to bend so as to surround a side surface and a front end surface excluding the base bottom surface of the rubber elastic body, and a rigid surrounding member, and a shape portion corresponding to the base bottom surface of the rubber elastic body A shoulder wall provided at the base of the rubber elastic body, and having a bottom wall member that surrounds the rubber elastic body over the entire circumference in cooperation with the surrounding member Is configured to have a bent step corresponding to the Thus, in a state where the rubber elastic body is surrounded by the surrounding member and the bottom wall member, the surrounding member is in contact with both the left and right side surfaces and the front end surface of the extension portion of the rubber elastic body from the base portion. The two shoulder portions of the rubber elastic body are disposed between the bottom wall member and the stepped portion of the surrounding member, respectively, facing each other at a predetermined distance and surrounding the extending portion. Another object of the present invention is to provide an anti-vibration device in which the second mounting member is connected to the rubber elastic body by clamping and holding.
[0017]
In short, in the vibration isolator according to the present invention, only the first mounting member is vulcanized and bonded to the distal end portion of the portion extending from the base portion of the rubber elastic body on the outer peripheral surface thereof. The body is clamped and held at the base portion between the surrounding member providing the second mounting member and the bottom wall member, and the base side portion of the extending portion of the rubber elastic body is hollowed out. And an encircling member is positioned so as to surround the extending portion of the rubber elastic body in a state of facing the left and right side surfaces and the front end surface with a predetermined distance therebetween. It is being crushed.
[0018]
Therefore, even in the vibration isolator according to the present invention, the manufacturing process can be advantageously simplified, and the spring characteristic of the rubber elastic body portion functioning as a spring portion against input vibration can be made sufficiently sufficiently soft, The vibration-proof performance can be dramatically improved, and further, the occurrence of tensile strain in the rubber elastic body and excessive relative displacement of the first mounting member with respect to the second mounting member can be prevented, and the rubber elastic body, As a result, the use durability of the entire apparatus can be improved extremely effectively.
[0019]
In the vibration isolator according to the present invention, in particular, the second mounting member has at least a shape portion corresponding to the bottom surface of the base of the rubber elastic body in addition to the surrounding member, and cooperates with the surrounding member. The rubber elastic body includes a bottom wall member that surrounds the entire circumference of the rubber elastic body. When the rubber elastic body is surrounded by the surrounding member and the bottom wall member, the two shoulder portions of the rubber elastic body are The second mounting member is connected to the rubber elastic body by being clamped and held between the surrounding member and the bottom wall member, respectively. The two mounting members can be handled as an integrated assembly that is assembled by being connected with a rubber elastic body, and thereby, better handling properties can be exhibited. Can be dramatically improved It is to be.
[0020]
According to one of the preferable embodiments of the vibration isolator according to the present invention, a fitting recess is provided on the bottom surface of the base of the rubber elastic body, while the bottom wall member has a fitting recess. The rubber elastic body is fitted in a state in which a fitting convex portion that can be fitted is provided and the rubber elastic body is surrounded by the surrounding member and the bottom wall member over the entire circumference. The fitting projection provided on the bottom wall member enters the fitting recess and is configured to be fitted.
[0021]
In the vibration isolator having such a configuration, if the fitting recess is provided with the fitting projection at a fixed position with respect to the base bottom surface and the bottom wall member of the rubber elastic body, the rubber elasticity When the body is surrounded by the surrounding member and the bottom wall member, the body can always be positioned at a certain position, so that the positioning becomes easy.
[0022]
According to another advantageous aspect of the vibration isolator according to the present invention, the base portion of the rubber elastic body is in a state where the rubber elastic body is surrounded by the surrounding member and the bottom wall member. Is perpendicular to the horizontal direction of thickness The rubber elastic body is in contact with two side surfaces in the direction, and is perpendicular to the left-right direction of the rubber elastic body thickness A regulation wall that regulates movement in the direction is provided on the bottom wall member so as to sandwich the base of the rubber elastic body.
[0023]
In the vibration isolator having such a configuration, for example, in a state of being mounted on an automobile or the like, in a direction perpendicular to the left-right direction of the first mounting member with respect to the second mounting member due to vibration input. The relative displacement of the rubber elastic body can be effectively prevented from being separated from the surrounding member and the bottom wall member due to the relative displacement in such a direction. It can be ensured stably, and the use durability of the entire apparatus can be increased more advantageously.
[0024]
Furthermore, according to one of the other desirable modes of the vibration isolator according to the present invention, the first mounting member protrudes toward both sides in the left-right direction at the portion embedded in the rubber elastic body. Part.
[0025]
In the vibration isolator having such a configuration, for example, the second attachment of the first attachment member in the rebound direction (extension direction of the extending portion of the rubber elastic body) under the attachment state to an automobile or the like. At the time of relative displacement with respect to the member, the portion of the surrounding member facing the distal end surface of the extending portion of the rubber elastic body is protruded from the distal end portion of the extending portion of the rubber elastic body by the rigid first mounting member Thus, excessive relative displacement of the first mounting member in the rebound direction can be more reliably prevented.
[0026]
Moreover, according to another advantageous aspect of the vibration isolator according to the present invention, the surrounding member extends in the left-right direction facing the tip end surface of the rubber elastic body extending from the base portion. A flat ceiling wall portion and two side wall portions respectively facing the left and right side surfaces of the extending portion from the base portion of the rubber elastic body, which respectively hang down in the height direction from both left and right end portions of the ceiling wall portion. And configured.
[0027]
In the vibration isolator having such a structure, the function as a stopper for preventing excessive relative displacement in the rebound direction and the left-right direction with respect to the second mounting member of the first mounting member is in the surrounding member. The comparatively simple structure can be more reliably exhibited.
[0028]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, in order to clarify the present invention more specifically, the configuration of the vibration isolator according to the present invention will be described in detail with reference to the drawings.
[0029]
First, FIG. 1 to FIG. 3 show an embodiment of an engine mount for an FF type vehicle in which main vibrations are inputted in the vertical direction as one embodiment of a vibration isolator having a structure according to the present invention. In longitudinal section form, each is schematically shown. As is clear from these drawings, the engine mount 10 of the present embodiment has an inner metal fitting 12 as a first attachment member and an outer metal fitting 14 as a second attachment member arranged at a predetermined distance. The inner metal member 12 and the outer metal member 14 are fixedly attached to a power unit and a body (not shown). As a result, the power unit is supported in a vibration-proof manner with respect to the body.
[0030]
More specifically, the inner metal fitting 12 has a thick, generally small-diameter cylindrical shape as a whole. Further, in the inner metal fitting 12, a protruding portion 18 that is extended in the left-right direction so that the cylindrical wall portion bulges outward in the radial direction is provided at an intermediate portion in the axial direction. The upper surface and the lower surface of the projecting portion 18 are each a planar portion 20 having a planar form.
[0031]
On the other hand, the rubber elastic body 16 interposed between the inner metal fitting 12 and the outer metal fitting 14 has a predetermined vertical direction, which is the main vibration input direction, when the engine mount 10 is mounted on an automobile. The dimension in the width direction (the direction corresponding to the left-right direction in FIG. 1) that has a height and is perpendicular to the main vibration input direction is in both the height direction (up-down direction) and the width direction. It has a substantially rectangular block shape as a whole, which is sufficiently larger than the dimension in the thickness direction (direction corresponding to the direction perpendicular to the paper surface in FIG. 1) which is a direction perpendicular to the sheet. Yes.
[0032]
In the rubber elastic body 16, the base 22 that is the lower end of the rubber elastic body 16 bulges on both sides in the width direction (left-right direction), and the width of the base 22 extends upward from the base 22. Two shoulder portions 26, 26 which are larger than the width of the extended portion 24 to be extended are formed. Further, on the bottom surface of the base portion 22 of the rubber elastic body 16, a fitting recess 28 having a rectangular hole shape is provided at substantially the center thereof, and the depth is substantially the same as the height of each shoulder portion 26 provided in the base portion 22. Is formed.
[0033]
Further, an empty space 30 is provided in the middle portion of the rubber elastic body 16 in the height direction, that is, in the center portion in the width direction of the portion 22 side portion of the portion 24 extending from the base portion 22. The hollow space 30 has a substantially triangular inner peripheral surface shape, and extends in a direction perpendicular to both the height direction and the width direction of the rubber elastic body 16, that is, in the thickness direction. The portion 24 is configured to extend through the base 22 side portion of the portion 24. That is, here, due to the presence of such a hollow space 30, the central portion in the width direction of the portion 22 side portion of the extended portion 24 from the base portion 22 of the rubber elastic body 16 has a substantially triangular shape, and the rubber elastic body 16 It is continuously punched in the thickness direction.
[0034]
Moreover, the recessed part is formed in the both sides | surfaces of the width direction in the base 22 side part of the extension part 24 of the rubber elastic body 16 in which such a hollow space 30 was provided, and this recessed part is The width of the base 22 side portion is a constricted portion 32 that is smaller than the width of the distal end side portion of the extending portion 24 of the rubber elastic body 16.
[0035]
Further, in the rubber elastic body 16, a groove portion 34 that divides the distal end surface into two planes is provided in the thickness direction of the rubber elastic body 16 at the center portion in the width direction of the distal end surface of the extended portion 24 from the base portion 22. Are formed so as to continuously extend from one of the two side surfaces to the other.
[0036]
Then, the inner metal fitting 12 penetrates through the empty space 30 provided in the extended portion 24 at the distal end side portion of the extended portion 24 from the base portion 22 in the rubber elastic body 16 configured as described above. The rubber elastic body 16 is extended along the thickness direction as a direction, embedded in the protruding portion 18 provided in the intermediate portion in the axial direction, and both end portions in the axial direction protrude outward. Are vulcanized and bonded together. That is, here, the rubber elastic body 16 is integrally vulcanized with the inner metal member 12 vulcanized and bonded to the distal end portion of the extended portion 24 from the base portion 22 on the outer peripheral surface of the intermediate portion in the axial direction. It is a molded product.
[0037]
On the other hand, the outer metal fitting 14 further includes a surrounding metal fitting 36 as an enclosure member and a bottom wall metal fitting 38 as a bottom wall member. And among these both metal fittings 36 and 38, the surrounding metal fitting 36 has a form in which a long rectangular metal plate material is bent in a U-shape in the thickness direction at an intermediate portion in the longitudinal direction, The middle portion in the longitudinal direction is a U-shaped portion 40 having a ceiling wall portion 43 and two side wall portions 44, 44 extending in the vertical direction from both left and right end portions of the ceiling wall portion 43. The both end portions are mounting flange portions 42. Further, in the surrounding metal fitting 36, the U-shaped portion 40 is sized so as to be able to surround both side surfaces and the front end surface in the width direction in the extending portion 24 from the base portion 22 of the rubber elastic body 16 in a non-contact manner. In addition, step portions 46 exhibiting a bent shape corresponding to the two shoulder portions 26 provided on the base portion 22 of the rubber elastic body 16 at the end portions of the side wall portions 44, 44 opposite to the ceiling wall portion 43. 46 are provided and configured.
[0038]
Further, the bottom wall fitting 38 that constitutes the outer fitting 14 together with the surrounding fitting 36 has a substantially longitudinal rectangular flat plate shape as a whole, and both end portions in the longitudinal direction thereof are mounting flange portions 42 of the surrounding fitting 36. The intermediate portion in the longitudinal direction can close the shape corresponding to the bottom surface of the base portion 22 of the rubber elastic body 16 and the opening portion of the U-shaped portion 40 of the surrounding metal fitting 36. The bottom wall portion 50 has a large size. In addition, a fitting convex portion that can be fitted into the fitting recess 28 provided in the bottom surface of the base portion 22 of the rubber elastic body 16 is inserted into the central portion of the bottom wall portion 50 of the bottom wall fitting 38. 52 is projectingly formed.
[0039]
Furthermore, in the bottom wall fitting 38, the rubber elastic body 16 is mounted on both sides in the width direction (left and right direction in FIG. 3) with the rubber elastic body 16 of the bottom wall fitting 38 as described later. The wall portions 54 and 54 that are in contact with the two side surfaces in the thickness direction (left and right direction in FIG. 3) of the base portion 22 are substantially the same height as the base portion 22 of the rubber elastic body 16 and the width of the base portion 22. It is also erected with a large length.
[0040]
In this example, the surrounding metal fitting 36 of the outer metal fitting 14 accommodates the rubber elastic body 16 in the U-shaped portion 40 and the ceiling wall portion 43 of the U-shaped portion 40 and the two pieces. The side wall portions 44 and 44 are opposed to the front end surface of the extended portion 24 of the rubber elastic body 16 to which the inner metal fitting 12 is vulcanized and bonded to both side surfaces in the width direction with a predetermined distance therebetween. On the other hand, the extension portion 24 is surrounded and positioned at the two step portions 46 and 46 in contact with the two shoulder portions 26 and 26 provided on the base portion 22 of the rubber elastic body 16. Further, the bottom wall fitting 38 of the outer fitting 14 closes the opening of the U-shaped portion 40 of the surrounding metal fitting 36 in the bottom wall portion 50 and is accommodated in the U-shaped portion 40. The base portion 22 of the rubber elastic body 16 is in contact with the flange walls 54, 54 between the two flange walls 54, 54 of the bottom wall 50. It is positioned so that it is pinched.
[0041]
Thus, under the state where the surrounding metal fitting 36 and the bottom wall metal fitting 38 of the outer metal fitting 14 surround the rubber elastic body 16 over the entire circumference, the respective step portions 26 and 26 and the bottom of the surrounding metal fitting 36 are provided. The two shoulder portions 26 and 26 in the base portion 22 of the rubber elastic body 16 are clamped and held between the bottom wall portion 50 of the wall fitting 38 and the ribs 54 and 54 of the bottom wall fitting 38 with respect to the flange walls 54 and 54, respectively. The rubber elastic body 16 is arranged so as to prevent the rubber elastic body 16 from moving in the thickness direction by the contact of the base portion 22, and in such an arrangement state, the mounting flange portions 42, 42 and the mounting piece portions 48 of the bottom wall fitting 38 are overlapped with each other and riveted. As is clear from this, in the present embodiment, the restriction wall portion is constituted by the flange wall portions 54 and 54.
[0042]
Thereby, in this embodiment, the outer metal fitting 14 is connected to the rubber elastic body 16 to which the inner metal fitting 12 is vulcanized and bonded, so that the inner metal fitting 12 and the outer metal fitting 14 are interposed therebetween. The rubber elastic body 16 is elastically connected. A predetermined shaft member (not shown) fixed to the power unit is inserted and fixed in the inner hole of the cylindrical inner metal member 12 connected via the rubber elastic body 16, while the outer metal member 14. Mounting bolts (not shown) are inserted into the mounting holes 56 and 58 provided at corresponding positions in the mounting flange portions 42 and 42 of the surrounding metal fitting 36 and the mounting piece portions 48 and 48 of the bottom wall metal fitting 38, respectively. Then, the mounting bolt is fixed to the body side, so that the engine mount 10 of the present embodiment is attached to the automobile.
[0043]
Thus, in the engine mount 10 of the present embodiment, only the inner metal fitting 12 is vulcanized and bonded to the rubber elastic body 16 on the outer peripheral surface thereof. It is possible to advantageously avoid the occurrence of tensile strain in the rubber elastic body 16 by allowing free contraction after vulcanization, thereby removing such tensile strain and It is possible to effectively eliminate the necessity of performing drawing processing and press-fitting work of the outer cylinder member, which has been conventionally performed in order to ensure durability. As a result, simplification of the manufacturing process can be achieved extremely advantageously as long as these troublesome operations are not performed.
[0044]
Further, in the engine mount 10 of the present embodiment, the rubber elastic body 16 has, at its base portion 22, the step portions 46 and 46 of the surrounding metal fitting 36 in the outer metal fitting 14 and the bottom wall portion 50 of the bottom wall metal fitting 38. The outer metal fitting 14 is connected to the rubber elastic body 16 by being clamped and held between the inner metal fitting 12 and the inner metal fitting 12 at the distal end side portion of the extended portion 24 from the base portion 22 of the rubber elastic body 16. Since it is connected to the rubber elastic body 16 by being vulcanized and bonded in an embedded state, the surrounding metal fitting is attached to the base portion 22 of the rubber elastic body 16 to which the outer metal fitting 14 is connected. Although the compression force based on the clamping pressure exerted between the step portions 46 and 46 of the 36 and the bottom wall portion 50 of the bottom wall fitting 38 is applied, it is applied to the extended portion 24 from the base portion 22 of the rubber elastic body 16. Is such a compressive force What such is the will never be allowed to act.
[0045]
Therefore, in such an engine mount 10, the inner metal member 12 is vulcanized and bonded, and the extension part of the rubber elastic body 16 that functions as a spring portion against input vibration between the inner metal member 12 and the outer metal member 14 is used. The spring characteristics can be made sufficiently soft.
[0046]
Moreover, in the engine mount 10 of the present embodiment, the extension portion 24 from the base portion 22 of the rubber elastic body 16 is provided with a hollow space 30 extending through the extension portion 24 in the thickness direction, and the extension portion 24. Since the constricted portion 32 for reducing the width is provided, the spring characteristics in the vertical direction of the rubber elastic body 16 and the spring characteristics in the width direction are obtained even when the initial load is input by being attached to the automobile. Can be made sufficiently soft.
[0047]
Therefore, in the engine mount 10 according to the present embodiment as described above, the spring characteristic of the extension portion 24 from the base portion 22 of the rubber elastic body 16 that functions as a spring portion against input vibration is further sufficiently softened. As a result, superior vibration-proof performance can be exhibited extremely effectively. When the engine mount 10 of this embodiment is mounted on an automobile so that the width direction of the rubber elastic body 16 and the front-rear direction of the body coincide, the spring characteristics in the width direction of the rubber elastic body 16 are sufficiently soft. As a result, the anti-vibration effect against idling vibration of the engine can be further advantageously improved.
[0048]
Further, in the engine mount 10 of the present embodiment, the front end surface of the extending portion 24 of the rubber elastic body 16 that exhibits the soft spring characteristics as described above and the both side surfaces in the width direction are the same in the surrounding metal fitting 36 of the outer metal fitting 14. From the place where the ceiling wall portion 43 and the side wall portions 44, 44 of the character-shaped portion 40 are surrounded while facing each other with a predetermined distance, the inner metal fitting 12 is Even when the outer metal member 14 is relatively displaced in the vertical direction or the left and right direction (the width direction of the rubber elastic body 16), the extension portion of the surrounding metal member 36 with respect to the ceiling wall portion 43 and the side wall portions 44 and 44 is extended. As a result, it is possible to advantageously prevent excessive relative displacement from being caused by the abutment of 24, and as a result, the rubber elastic body 16 and, consequently, the engine mount 10 as a whole can be used in a durable manner. Above, it is to become the be achieved effectively.
[0049]
Furthermore, in the engine mount 10 of the present embodiment, the rubber elastic body 16 is clamped and held between the surrounding metal fitting 36 of the outer metal fitting 14 and the bottom wall metal fitting 38 at the base portion 22, so that the outer metal fitting is held. 14 is connected to the rubber elastic body 16, while the inner metal fitting 12 is vulcanized and bonded in a state where it is embedded in the distal end side portion of the extended portion 24 from the base portion 22 of the rubber elastic body 16, so that the rubber Since it is connected to the elastic body 16, an integrated assembly in which the inner metal fitting 12 and the outer metal fitting 14 are connected by the rubber elastic body 16 in a state before being mounted on the automobile. As a result, more excellent handling properties can be exhibited, and the assembling property to the automobile can be dramatically improved.
[0050]
Further, in the engine mount 10 of the present embodiment, the fitting recess 28 is provided on the bottom surface of the base portion 22 of the rubber elastic body 16, while the bottom wall portion 50 of the bottom wall fitting 38 of the outer fitting 14 is provided on the bottom wall portion 50. Since the fitting convex portion 52 is provided so as to enter and fit into the fitting recess 28, the rubber elastic body 16 is made to fit by the concave and convex fitting between the fitting concave portion 28 and the fitting convex portion 52. Thus, it is possible to always assemble the bottom wall fitting 38 at a fixed position, so that positioning when the outer fitting 14 is connected to the rubber elastic body 16 becomes easy.
[0051]
Further, in such an engine mount 10, the bottom wall metal fitting 38 of the outer metal fitting 14 is provided with the flange wall portions 54, 54, and the thickness of the rubber elastic body 16 is reduced in a state where the outer metal fitting 14 is assembled to the rubber elastic body 16. The thickness of the rubber elastic body 16 with respect to the outer metal fitting 14 of the inner metal fitting 12 in a state where the inner metal fitting 12 is attached to the automobile since the movement in the direction is prevented by the hook wall portions 54, 54. Relative movement in the direction is restricted, whereby the inner metal fitting 12 is vulcanized and bonded, and the rubber elastic body 16 surrounded by the surrounding metal fitting 36 and the bottom wall metal fitting 38 in the outer metal fitting 14 is Due to the relative movement with respect to the outer metal fitting 14, it can be advantageously prevented that the enclosure metal fitting 36 and the bottom wall metal piece 38 are separated from each other. As a result, the vibration-proof performance is reduced. With which may be ensured manner is the so that the serviceable life of the entire device can be advantageously enhanced.
[0052]
Furthermore, in the engine mount 10 of the present embodiment, in the inner metal fitting 12 to be vulcanized and bonded so as to be embedded in the distal end side portion of the extended portion 24 from the base portion 22 of the rubber elastic body 16, Since a protruding portion 18 that extends in the width direction of the rubber elastic body 16 and has an upper surface that is a flat surface portion 20 is provided at a bonding portion (buried portion) to the rubber elastic body 16, When relative displacement of the metal fitting 12 with respect to the outer metal fitting 14 in the rebound direction is generated, the ceiling wall portion 43 of the U-shaped portion 40 in the surrounding metal fitting 36 of the outer metal fitting 14 is extended to the extended portion 24 of the rubber elastic body 16. It will be made to contact | abut to the flat surface part 20 of the protrusion part 18 of the inner metal fitting 12 via the front-end | tip side part of this, Thereby, the excessive relative displacement to the rebound direction of the inner member 12 is blocked | prevented more reliably. Than is that may be.
[0053]
Further, in the engine mount 10 according to the present embodiment, the groove portion 34 is provided on the distal end surface of the extending portion 24 of the rubber elastic body 16, and the distal end surface is divided into two planes. Therefore, as described above, when a relative displacement in the rebound direction of the inner metal member 12 with respect to the outer metal member 14 is generated, the distal end surface of the extending portion 24 of the rubber elastic body 16 becomes the center of the surrounding metal member 36 facing it. Since it can be made to contact more stably with respect to the ceiling wall part 43 of the character-shaped part 40, the excessive relative displacement to the rebound direction of the inner member 12 can be prevented more reliably by this. is there.
[0054]
Furthermore, in the engine mount 10 of the present embodiment, since there are no joint portions due to welding, there is advantageously no reduction in strength due to the occurrence of thermal strain during welding, and the durability of the entire apparatus is improved. Sex can be effectively enhanced.
[0055]
The specific configuration of the present invention has been described in detail above. However, this is merely an example, and the present invention is not limited by the above description.
[0056]
For example, in the embodiment, the inner metal fitting 12 has a substantially cylindrical overall shape, but it can be attached to a member to be vibration-proofed such as a power unit or a body, and is embedded in a rubber elastic body. As long as it can be vulcanized and bonded, the shape is not limited to this.
[0057]
Further, it goes without saying that the shapes of the surrounding metal fitting 36 and the bottom wall metal fitting 38 of the outer metal fitting 14 are not particularly limited to those shown in the embodiment.
[0058]
Furthermore, in the above-described embodiment, the outer metal fitting 14 is composed of the surrounding metal fitting 36 and the bottom wall metal fitting 38, and they cooperate to surround the rubber elastic body 16. 38, the two shoulder portions 26, 26 of the rubber elastic body 16 are clamped and held, respectively. However, the outer metal fitting 14 is constituted only by the surrounding metal fitting 36, and the rubber elastic body 16 is surrounded by the U-shaped portion 40 of the surrounding metal fitting 36, and each shoulder 26, 26 is placed between the step portions 46, 46 of the surrounding metal fitting 36 and the body to which the surrounding metal fitting 36 is attached. It is also possible to clamp and hold. As a result, the number of parts of the engine mount 10 can be advantageously reduced, so that cost reduction and further simplification of the manufacturing process can be effectively realized.
[0059]
In addition, in the said embodiment, although the specific example of what applied this invention to the engine mount for FF type vehicles in which the main vibration is inputted in the up-and-down direction was shown, the present invention other than the FF type vehicles Needless to say, the present invention can be advantageously applied to any engine mount for automobiles, vibration isolators for automobiles other than engine mounts, or anti-vibration apparatuses other than automobiles.
[0060]
In addition, although not enumerated one by one, the present invention can be carried out in a mode to which various changes, modifications, improvements and the like are added based on the knowledge of those skilled in the art. It goes without saying that all are included in the scope of the present invention without departing from the spirit of the present invention.
[0061]
【The invention's effect】
As is clear from the above description, in the vibration isolator according to the present invention, not only the manufacturing process can be advantageously simplified, but also the spring characteristics of the rubber elastic body portion functioning as a spring portion against the input vibration are obtained. It can be made sufficiently softer, and the vibration-proof performance can be dramatically improved. Moreover, the use durability of the rubber elastic body and thus the entire device can be improved extremely effectively. It is.
[Brief description of the drawings]
FIG. 1 is a front explanatory view showing an example of an engine mount having a structure according to the present invention.
2 is an explanatory top view of FIG. 1. FIG.
3 is an explanatory view taken along the line III-III in FIG.
[Explanation of symbols]
10 Engine mount 12 Inside bracket
14 Outer metal fitting 16 Rubber elastic body
18 Protrusion 22 Base
24 Extension part 26 Shoulder
28 Mating recess 30 Meat emptying space
32 Tightening part 36 Enclosure bracket
38 Bottom wall bracket 40 U-shaped part
43 Ceiling wall 44 Side wall
46 steps 50 bottom wall
52 fitting convex part 54 wall part

Claims

A first attachment member attached to one of the two members to be damped, a second attachment member attached to the other of them, the first attachment member and the second attachment member A vibration isolator having a rubber elastic body interposed between and elastically connecting them,
The rubber elastic body has a block shape having a predetermined height in the main vibration input direction, and two shoulder portions that bulge on both sides in the left-right direction perpendicular to the main vibration input direction are formed at the base. And a hollow portion extending through the base side portion in a direction perpendicular to both the height direction and the left-right direction at the base side portion of the extending portion extending in the height direction from the base portion. And a constricted portion for making the horizontal dimension of the base side portion smaller than that of the tip side portion of the portion extending from the base so as to be located on both sides of the base side portion. ,
In a state in which the first mounting member is embedded in a part thereof at the distal end portion of the extending portion from the base portion of the rubber elastic body so as to extend along the penetration direction of the meat emptying space, While vulcanized and bonded to the rubber elastic body and integrally connected,
The second mounting member has a rigid surrounding member formed by bending so as to surround a side surface and a front end surface excluding a base bottom surface of the rubber elastic body, and the surrounding member includes the rubber elastic body. The left and right side surfaces and the distal end surface of the rubber elastic body extending from the base portion are configured to have a stepped portion corresponding to a shoulder portion provided on the base portion. Each of the two shoulders of the rubber elastic body at the stepped portion of the surrounding member so as to face each other at a predetermined distance from each other and surround the extending portion. The second mounting member is configured to be connected to the rubber elastic body by being clamped and held between the member to be vibration-proofed and attached to the member to be vibration-proofed. apparatus.

A first attachment member attached to one of the two members to be damped, a second attachment member attached to the other of them, the first attachment member and the second attachment member A vibration isolator having a rubber elastic body interposed between and elastically connecting them,
The rubber elastic body has a block shape having a predetermined height in the main vibration input direction, and two shoulder portions that bulge on both sides in the left-right direction perpendicular to the main vibration input direction are formed at the base. And a hollow portion extending through the base side portion in a direction perpendicular to both the height direction and the left-right direction at the base side portion of the extending portion extending in the height direction from the base portion. And a constricted portion for making the horizontal dimension of the base side portion smaller than that of the tip side portion of the portion extending from the base so as to be located on both sides of the base side portion. ,
In a state in which the first mounting member is embedded in a part thereof at the distal end portion of the extending portion from the base portion of the rubber elastic body so as to extend along the penetration direction of the meat emptying space, While vulcanized and bonded to the rubber elastic body and integrally connected,
The second mounting member is formed to bend so as to surround the side surface and the front end surface of the rubber elastic body except the base bottom surface, and a rigid enclosing member, and a shape portion corresponding to the base bottom surface of the rubber elastic body And a bottom wall member surrounding the rubber elastic body over the entire circumference in cooperation with the surrounding member, and the surrounding member is provided on the shoulder of the rubber elastic body. And the rubber elastic body is surrounded by the surrounding member and the bottom wall member, and the surrounding member is formed of the step of the rubber elastic body. While facing the left and right side surfaces and the distal end surface of the extension portion from the base portion with a predetermined distance, and surrounding the extension portion, the step of the surrounding member The two shoulder portions are connected to the bottom wall member. In by each clamp and allowed retention, the second mounting member, the vibration damping device, characterized in that it adapted to be connected to the rubber elastic body.

A fitting recess is provided on the bottom surface of the base portion of the rubber elastic body, and a fitting convex portion is provided on the bottom wall member so as to enter and fit into the fitting recess. In the state surrounded by the surrounding member and the bottom wall member over the entire periphery, the fitting convex portion provided on the bottom wall member enters the fitting recess of the rubber elastic body. The vibration isolator according to claim 2 adapted to be fitted.

In a state where the rubber elastic body is surrounded by the surrounding member and the bottom wall member, the rubber elastic body contacts two side surfaces in the thickness direction perpendicular to the left-right direction of the base portion of the rubber elastic body, 4. The bottom wall member is provided with a regulating wall portion for regulating movement of the rubber elastic body in a thickness direction perpendicular to the left-right direction so as to sandwich the base portion of the rubber elastic body. The vibration isolator described in 1.

5. The prevention according to claim 1, wherein the first mounting member has a protruding portion that extends toward both sides in the left-right direction at a portion embedded in the rubber elastic body. Shaker.

The surrounding member has a flat ceiling wall portion extending in the left-right direction opposite to a distal end surface of a portion extending from the base portion of the rubber elastic body, and the height direction from both left and right end portions of the ceiling wall portion The vibration isolator according to any one of claims 1 to 5, further comprising two side wall portions respectively facing left and right side surfaces of a portion extending from the base portion of the rubber elastic body.