JP2004225731A - Vibration control equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent an engine vibration and noise from being transmitted into a cabin by reducing an internal loss of an elastic stopper member and lowering a dynamic spring constant. <P>SOLUTION: Vibration control equipment is comprised of an outside member 1 connected to a vehicle body and formed in a cylindrical shape, an inside member 2 positioned at an inside perimeter side of the outside member 1, a mounting member 4 having one side fastened to an end of the inside member 2 and the other side connected to the engine, an elastic body 3 arranged between the inside member 2 and the outside member 1, a stopper 5 capable of restricting a relative movement of the inside member 2 with respect to the outside member 1 by contacting with the mounting member 4, and an elastic stopper member 6 covering over one side of the mounting member 4 so as to cover the contact part with the stopper 5. A horizontal hole or a hollow 7 is provided in the right and left direction so that the elastic stopper member 6 is sheared and deformed in the part between the mounting member 4 and the stopper 5 in the vertical direction and the lengthwise direction. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、振動発生部からの振動の伝達を防止する場合等に適用される防振装置に関するものであり、振動を発生するエンジン等の部材を支持するマウント類に適用可能なものである。
【０００２】
【従来の技術】
従来の防振装置としては、図１３及び図１４に示すように、振動発生部及び振動受部の一方に連結され且つ筒状に形成される外側部材１００と、外側部材１００の内周側に位置した内側部材１０１と、一端側が内側部材１０１の端部に固定されると共に他端側が振動発生部及び振動受部の他方に連結される取付部材１０２と、これら内側部材１０１と外側部材１００との間に配置されて内側部材１０１と外側部材１００とを弾性変形可能に連結する弾性体１０３と、外側部材１００側に配置されて取付部材１０２の一端側と対向して位置すると共に取付部材１０２と当接することで外側部材１００に対する内側部材１０１の相対移動を制限し得るストッパ部１０４と、少なくともストッパ部１０４との当接部分を覆うように取付部材１０２の一端側に圧入により被せられた弾性変形可能な弾性ストッパ部１０５と、弾性ストッパ部１０５の取付部材１０２への圧入部分の入り口にテーパ状に設けられたテーパ部１０６とを有するものが知られている（例えば、特許文献１参照）。前記ストッパ部１０４は、逆Ｕ字状に形成された金具であり、円筒状に形成された外側部材１００の内部には液室１０７が形成され、この液室１０７は複数の室に分けられ、各室間の液の流通によって減衰作用を果たして防振効果を高めている。
【０００３】
【特許文献１】
特開平１１−１５３１７８号公報（第２−４頁、図１）
【０００４】
【発明が解決しようとする課題】
従来の防振装置では、取付部材１０２の他端側にエンジンを連結し、エンジンを作動させると、その振動は取付部材１０２、内側部材１０１を介して弾性体１０３に伝達され、この弾性体１０３が吸振作用を果たす。また、エンジンから過大な振幅の振動が入力された場合、ストッパ部１０４に取付部材１０２に被せられた弾性ストッパ部材１０５が当接してリバウンドを阻止するようになっている。この弾性ストッパ部材１０５のストッパ部に当接する個所を山形状に形成して弾性材料（ゴム）のボリュームを増大させれば、ストッパ部１０４への当りが柔らかくなり、静的ばね定数Ｋｓが低くなり、エンジン振動や音の車室内への伝達が抑制されることとなる。
【０００５】
従来の弾性ストッパ部材１０５の構成において、ゴムボリュームを増大させて静的ばね定数Ｋｓを低くするだけでは、エンジン振動や振動音の車室内への伝達の十分な抑制にはなっておらず、さらなる抑制が求められている。また、静的ばね定数Ｋｓを低くすることは、弾性ストッパ部材１０５の耐久性向上に反するため、耐久性も考慮すると十分に低くできない場合もあった。
【０００６】
そこで、本発明は、ストッパ部に弾性ストッパ部材が上下、前後で当接し、当接時にかかる上下、前後の変形に対して弾性ストッパ部材の内部抵抗を少なくし、すなわち弾性ストッパ部材の内部損失を少なくして動的ばね定数Ｋｄを低くし、エンジンの振動や音の車室内への伝達を抑えることのできる防振装置を提供することを目的とする。
【０００７】
【課題を解決するための手段】
本発明は、上述の目的を達成するため、請求項１に係る発明では、振動発生部及び振動受部の一方に連結され且つ筒状に形成される外側部材と、外側部材の内周側に位置した内側部材と、一端側が内側部材の端部に固定されると共に他端側が振動発生部及び振動受部の他方に連結される取付部材と、これら内側部材と外側部材との間に配置されて内側部材と外側部材とを弾性変形可能に連結する弾性体と、外側部材側に設置されて取付部材の一端側と対向して位置すると共に取付部材と当接することで外側部材に対する内側部材の相対移動を制限し得るストッパ部と、少なくともストッパ部との当接部分を覆うように取付部材の一端側に被せられた弾性変形可能な弾性ストッパ部材とを有する防振装置であって、弾性ストッパ部材が、取付部材とストッパ部との間の部分での上下方向及び前後方向でせん断変形するように、左右方向に横穴又は中空部を設けたものである。請求項２に係る発明は、ストッパ部との弾性ストッパ部材の当接部分を山形状に形成したものである。請求項３に係る発明は、横穴又は中空部がそれぞれ複数設けられたものであり、請求項４に係る発明は、縦穴がせん断変形する部分の中央個所に設けられ、その両側に横穴又は中空部が設けられたものである。
【０００８】
【発明の実施の形態】
以下に本発明の実施の形態について、図面を参照にして説明する。
【０００９】
図１は、本発明の防振装置全体を示す正面図であり、円筒状に形成された金具から成る外側部材１が振動発生部及び振動受部の一方に連結され、この外側部材１の内周側に内側部材２を位置させ、この内側部材２と外側部材１との間に弾性体３を配置してある点は、従来例と同様である。また、取付部材（アームブラケット）４の一端側は内側部材２の端部に固定され、他端側は振動発生部及び振動受部の他方に、例えばエンジンに連結される。前記外側部材１側に設置されるストッパ部５は、取付部材４の一端側と対向して位置するとともに、取付部材４と当接することで外側部材１に対する内側部材２の相当移動を制限している。この取付部材１のストッパ部５内に位置する一端側に弾性変形可能な弾性ストッパ部材６を被せてある。そして、この弾性ストッパ部材６の少なくとも左右方向（車両の左右）に横穴７（又は端部が外に開口していない中空部であってもよい）を設けてある。この横穴７の形成位置は、弾性ストッパ部材６が取付部材４とストッパ部５との間の部分での上下方向及び前後方向（車両の前後）でせん断変形する位置である。
【００１０】
前記ストッパ部５は、逆Ｕ字状に形成され、その両端部は一対の脚部８に圧入されている。このストッパ部５の両端部及び脚部８には、それぞれ貫通孔５Ａ，８Ａが形成され、止めねじ９により脚部８の貫通孔８Ａ及びストッパ部５の貫通孔５Ａが一体的に貫通され、振動受部となる車体Ｂに締結されてこの防振装置が固定される。前記一対の脚部８は、外側部材１の外周側に形成されている。
【００１１】
前記取付部材４の他端側には、振動発生部となるエンジン（図示せず）を連結してある。この取付部材４の一端側は、止めボルト１０により内側部材２に固定されている。従って、弾性体３から突出される内側部材２はエンジンへの連結用として用いられることとなり、内側部材２が取付部材４を介してエンジンに連結されることになる。
【００１２】
図２には、弾性ストッパ部材６の平面図を示し、前記横穴７の他に縦穴７１をせん断変形する部分の中央個所に設けてあり、これら縦穴７１の両側に横穴７を設けてある。また、弾性ストッパ部材６には前記止めボルト１０が挿入される穴６１が形成されている。図２において、矢印方向（図面上真上）から取付部材４がこの弾性ストッパ部材６へ挿入される。この弾性ストッパ部材６がストッパ部５との、少なくとも前後方向の当接部分で山形状の山形部６２を形成してある。実施例における山形部６２は車両の前後方向に形成してあるが、上面に形成することもできる。また、この実施例では横穴７を左右両方向から形成したが、縦穴７１がなくて貫通する横穴７のみであってもよい。
【００１３】
図３は弾性ストッパ部材６を正面から見た図であり、中空部６３に取付部材４が挿入される。この実施例では横穴７は右方向から３個、左方向から３個、それぞれ６個の有底穴として形成されている。図４では縦穴７１を上下に貫通する穴ではなく、底を有する穴（有底穴）に形成したものを示し、図５では縦穴７１を貫通する穴として形成したものを示す。
【００１４】
図６に示す実施例では、縦穴７１を形成せずに、横穴７を左右に３個ずつ形成した例を示すものである。横穴７のみの場合も、弾性ストッパ部材６がストッパ部５に当接したときにせん断変形するような個所に横穴７は形成される。
【００１５】
図７は外側部材１の内部構造を示す断面であり、従来例と殆ど変わりがない。すなわち、外側部材１は、第１円筒部１Ａとこの第１円筒部１Ａの外径よりその外径が若干小径に形成され、第１円筒部１Ａの下側で円筒状に形成される第２円筒部１Ｂを有している。第２円筒部１Ｂの上部には外周に拡がるフランジ部１１が形成され、下端部にはテーパ状に縮まるテーパ部１２が形成してある。内周面にゴム製のダイヤフラム１３が加硫接着されているリング部材１４は、第２円筒部１Ｂ内に嵌合して固着されている。このダイヤフラム１３と弾性体３との間には、これらの部材で内壁面が形成された液室１５が設けられていて、例えば水やオイル等の液体が封入されている。そして、この液室１５内には、例えば合成樹脂材料で形成された隔壁部材１６が弾性体３の肉薄部分の内壁面に嵌合されると共に、係合部１７に外周側が係合して軸方向の位置決めがされている。この隔壁部材１６の中央部には円形の開口部が形成されていて、この開口部にはメンブラン１８を設けてある。前記ダイヤフラム１３と隔壁部材１６との間に挟持されて固定され、且つ中央部が隔壁部材１６の開口部に嵌合されるように円形に突出した金属製の円盤１９が当接している。また、***２０，２１が形成してあり、各液室間で液体が流通できるようになっている。
【００１６】
図８は全体の側面図を示し、取付部材４とストッパ部５と弾性ストッパ部材６の関係を示す。
【００１７】
図９は、山形部６２は形成してあるが、横穴７や縦穴７１を形成していない比較例１としての弾性ストッパ部材６を示し、図１０は比較例２として山形部６２の頂上が尖ったタイプのものであり、比較例１と同様に横穴７及び縦穴７１を形成しない弾性ストッパ部材６を示す。これら図９及び図１０に示す弾性ストッパ部材６を取り付けた防振装置（図１に示すような防振装置であって弾性ストッパ部材６のみを図９及び図１０に示すものを用いたもの）と、本発明の実施例に示す横穴７と縦穴７１を形成した弾性ストッパ部材６を使用した防振装置との荷重撓みの比較を図１１に示す。なお、比較例１，２と実施例との静的ばね定数Ｋｓと動的ばね定数Ｋｄは次の表１の通りである。
【００１８】
【表１】

【００１９】
図１１のグラフに示す実施例と比較例２の詳細は、図１２に示す拡大グラフの通りである。図１２に示すグラフ上ｐｒｅｌｏａｄのライン上では、比較例２と実施例では静的ばね定数Ｋｓが同じでも内部発熱は異なる。
【００２０】
【発明の効果】
以上説明したように、この発明によれば、弾性ストッパ部材が、取付部材とストッパ部との間の部分での上下方向及び前後方向でせん断変形するように、左右方向に横穴又は中空部を設けてあるので、単にゴムボリュームを増大させたもののような圧縮変形ではなく、せん断変形になり、内部損失が少なくなる。その結果、動的ばね定数を低くすることができる。同等の静的ばね定数であっても、従来に比べてエンジン振動や音の車室内への伝達が抑えられる。特に、こもり音域（動的ばね定数Ｋｄ１００）で効果があることが確認できた。また、弾性ストッパ部材がストッパ部との当接部分で山形状に形成されているものにあっては、静的ばね定数も低くなる。また、横穴又は中空部が複数設けられたものにあっては、せん断変形が大きくなり、さらに動的ばね定数を低くすることができる。さらにまた、縦穴がせん断変形する部分の中央個所に設けられ、その両側に横穴又は中空部が設けられたものにあっては、より一層せん断変形が大きくなり、動的ばね定数をさらに低くすることができる。
【図面の簡単な説明】
【図１】この発明の好適な実施例を示す正面図。
【図２】弾性ストッパ部材の平面図。
【図３】図２の正面図。
【図４】底を有する縦穴部分を示す部分的正面図。
【図５】縦穴が貫通した状態の部分的正面図。
【図６】他の実施例を示す弾性ストッパ部材の平面図。
【図７】外側部材の内部構造を示す断面図。
【図８】図１の側面図。
【図９】比較例１の弾性ストッパ部材を示す正面図。
【図１０】比較例２の弾性ストッパ部材を示す正面図。
【図１１】比較例１，２と実施例の荷重撓みを比較したグラフ。
【図１２】比較例２と実施例の荷重撓みを比較したグラフの詳細拡大図。
【図１３】従来例を示す断面図。
【図１４】従来例の弾性ストッパ部材と取付部材の斜視図。
【符号の説明】
１ 外側部材
２ 内側部材
３ 弾性体
４ 取付部材
５ ストッパ部
６ 弾性ストッパ部材
７ 横穴[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an anti-vibration device applied to a case where transmission of vibration from a vibration generating unit is prevented, and is applicable to mounts that support members such as an engine that generates vibration.
[0002]
[Prior art]
As shown in FIGS. 13 and 14, a conventional vibration isolator includes an outer member 100 connected to one of a vibration generator and a vibration receiver and formed in a cylindrical shape, and an inner peripheral side of the outer member 100. The inner member 101 positioned, a mounting member 102 having one end fixed to the end of the inner member 101 and the other end connected to the other of the vibration generating unit and the vibration receiving unit, and the inner member 101 and the outer member 100 An elastic member 103 arranged between the inner member 101 and the outer member 100 so as to be elastically deformable, and an elastic member 103 arranged on the outer member 100 side to face one end of the attaching member 102 and to be attached to the attaching member 102. A stopper 104 that can restrict the relative movement of the inner member 101 with respect to the outer member 100 by contacting with the outer member 100; One having an elastic stopper portion 105 capable of being elastically deformed over the end side by press fitting and a taper portion 106 provided in a tapered shape at the entrance of the press fitting portion of the elastic stopper portion 105 to the mounting member 102 is known. (For example, see Patent Document 1). The stopper portion 104 is a metal fitting formed in an inverted U shape, and a liquid chamber 107 is formed inside the outer member 100 formed in a cylindrical shape. The liquid chamber 107 is divided into a plurality of chambers. The damping effect is achieved by the flow of the liquid between the chambers to enhance the anti-vibration effect.
[0003]
[Patent Document 1]
JP-A-11-153178 (pages 2-4, FIG. 1)
[0004]
[Problems to be solved by the invention]
In the conventional vibration isolator, when the engine is connected to the other end of the mounting member 102 and the engine is operated, the vibration is transmitted to the elastic body 103 via the mounting member 102 and the inner member 101. Performs a vibration absorbing action. Further, when vibration having an excessive amplitude is input from the engine, the elastic stopper member 105 covered by the mounting member 102 comes into contact with the stopper portion 104 to prevent rebound. If the portion of the elastic stopper member 105 that contacts the stopper portion is formed in a mountain shape to increase the volume of the elastic material (rubber), the contact with the stopper portion 104 is softened, and the static spring constant Ks decreases. Thus, transmission of engine vibration and sound to the vehicle interior is suppressed.
[0005]
In the configuration of the conventional elastic stopper member 105, simply reducing the static spring constant Ks by increasing the rubber volume does not sufficiently suppress transmission of engine vibration and vibration noise to the vehicle interior. Suppression is required. Also, lowering the static spring constant Ks is contrary to the improvement of the durability of the elastic stopper member 105, and therefore, in some cases, it cannot be sufficiently reduced in consideration of the durability.
[0006]
Therefore, the present invention provides an elastic stopper member that contacts the stopper part up and down, back and forth, and reduces the internal resistance of the elastic stopper member against up and down and back and forth deformation at the time of contact, that is, reduces the internal loss of the elastic stopper member. It is an object of the present invention to provide an anti-vibration device that can reduce the dynamic spring constant Kd and reduce transmission of engine vibration and sound to the vehicle interior.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, an outer member connected to one of a vibration generator and a vibration receiver and formed in a cylindrical shape, and an inner peripheral side of the outer member. The located inner member, a mounting member having one end fixed to the end of the inner member and the other end connected to the other of the vibration generator and the vibration receiver, and disposed between the inner member and the outer member. An elastic member that connects the inner member and the outer member so that the inner member and the outer member can be elastically deformed. What is claimed is: 1. An anti-vibration device comprising: a stopper portion capable of restricting relative movement; and an elastically deformable elastic stopper member covered on one end side of a mounting member so as to cover at least a contact portion with the stopper portion. The member is the mounting part And to the vertical direction and shearing deformation in the longitudinal direction at the portion between the stopper portion, it is provided with a lateral hole or hollow portion in the lateral direction. According to a second aspect of the present invention, a contact portion of the elastic stopper member with the stopper portion is formed in a mountain shape. The invention according to claim 3 is provided with a plurality of lateral holes or hollow portions, respectively. The invention according to claim 4 is provided at a central portion of a portion where the vertical hole is subjected to shear deformation, and the lateral holes or hollow portions are provided on both sides thereof. Is provided.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0009]
FIG. 1 is a front view showing the entire vibration isolator of the present invention. An outer member 1 formed of a cylindrical metal fitting is connected to one of a vibration generator and a vibration receiver. The point that the inner member 2 is located on the circumferential side and the elastic body 3 is arranged between the inner member 2 and the outer member 1 is the same as the conventional example. One end of the mounting member (arm bracket) 4 is fixed to an end of the inner member 2, and the other end is connected to the other of the vibration generating unit and the vibration receiving unit, for example, to an engine. The stopper portion 5 provided on the outer member 1 side is positioned to face one end of the mounting member 4 and restricts a considerable movement of the inner member 2 with respect to the outer member 1 by contacting the mounting member 4. I have. An elastic stopper member 6 that can be elastically deformed is placed on one end of the mounting member 1 located inside the stopper portion 5. The elastic stopper member 6 is provided with a lateral hole 7 (or a hollow portion whose end is not open to the outside) at least in the left-right direction (left and right of the vehicle). The position where the lateral hole 7 is formed is a position where the elastic stopper member 6 is sheared in the vertical direction and the front-rear direction (front and rear of the vehicle) at the portion between the mounting member 4 and the stopper portion 5.
[0010]
The stopper portion 5 is formed in an inverted U-shape, and both end portions are press-fitted into a pair of leg portions 8. Through holes 5A, 8A are formed at both ends of the stopper portion 5 and the leg portion 8, respectively, and the through hole 8A of the leg portion 8 and the through hole 5A of the stopper portion 5 are integrally penetrated by a set screw 9. The vibration isolator is fixed by being fastened to a vehicle body B serving as a vibration receiving portion. The pair of legs 8 is formed on the outer peripheral side of the outer member 1.
[0011]
An engine (not shown) serving as a vibration generating unit is connected to the other end of the mounting member 4. One end of the mounting member 4 is fixed to the inner member 2 by a fixing bolt 10. Therefore, the inner member 2 protruding from the elastic body 3 is used for connection to the engine, and the inner member 2 is connected to the engine via the attachment member 4.
[0012]
FIG. 2 shows a plan view of the elastic stopper member 6, which is provided at the center of a portion where the vertical hole 71 is subjected to shear deformation in addition to the horizontal hole 7, and the horizontal hole 7 is provided on both sides of the vertical hole 71. The elastic stopper member 6 has a hole 61 into which the stop bolt 10 is inserted. 2, the mounting member 4 is inserted into the elastic stopper member 6 from the direction of the arrow (directly above the drawing). The elastic stopper member 6 forms a mountain-shaped chevron 62 at least at a contact portion in the front-rear direction with the stopper 5. Although the chevron 62 in the embodiment is formed in the front-rear direction of the vehicle, it may be formed on the upper surface. Further, in this embodiment, the horizontal hole 7 is formed from both the left and right directions. However, the horizontal hole 7 may be provided without the vertical hole 71.
[0013]
FIG. 3 is a front view of the elastic stopper member 6, and the mounting member 4 is inserted into the hollow portion 63. In this embodiment, the horizontal holes 7 are formed as six bottomed holes, three from the right and three from the left. FIG. 4 shows a vertical hole 71 formed as a hole having a bottom (a bottomed hole) instead of a hole penetrating vertically, and FIG. 5 shows a vertical hole 71 formed as a hole passing through the vertical hole 71.
[0014]
The embodiment shown in FIG. 6 shows an example in which three horizontal holes 7 are formed on the left and right without forming the vertical holes 71. In the case where only the lateral hole 7 is provided, the lateral hole 7 is formed at a location where the elastic stopper member 6 is sheared when the elastic stopper member 6 comes into contact with the stopper portion 5.
[0015]
FIG. 7 is a cross section showing the internal structure of the outer member 1, which is almost the same as the conventional example. That is, the outer member 1 has a first cylindrical portion 1A and an outer diameter slightly smaller than the outer diameter of the first cylindrical portion 1A, and a second cylindrical portion formed below the first cylindrical portion 1A. It has a cylindrical portion 1B. A flange portion 11 extending to the outer periphery is formed at an upper portion of the second cylindrical portion 1B, and a tapered portion 12 which is reduced in a tapered shape is formed at a lower end portion. A ring member 14 having a rubber diaphragm 13 adhered to the inner peripheral surface by vulcanization is fitted and fixed in the second cylindrical portion 1B. Between the diaphragm 13 and the elastic body 3, there is provided a liquid chamber 15 having an inner wall formed by these members, and a liquid such as water or oil is sealed therein. In the liquid chamber 15, a partition member 16 made of, for example, a synthetic resin material is fitted on the inner wall surface of the thin portion of the elastic body 3, and the outer peripheral side is engaged with the engaging portion 17 so that a shaft is formed. Direction positioning. A circular opening is formed in the center of the partition member 16, and a membrane 18 is provided in this opening. A metal disk 19, which is sandwiched and fixed between the diaphragm 13 and the partition member 16, and which protrudes in a circular shape so that the center portion is fitted into the opening of the partition member 16, is in contact with the disk 13. Further, small holes 20 and 21 are formed so that the liquid can flow between the liquid chambers.
[0016]
FIG. 8 is a side view of the whole, showing the relationship between the mounting member 4, the stopper portion 5, and the elastic stopper member 6.
[0017]
FIG. 9 shows an elastic stopper member 6 as a comparative example 1 in which the chevron 62 is formed but not the horizontal hole 7 and the vertical hole 71, and FIG. FIG. 6 shows an elastic stopper member 6 which does not have the horizontal hole 7 and the vertical hole 71 as in Comparative Example 1. The vibration isolator to which the elastic stopper member 6 shown in FIGS. 9 and 10 is attached (a vibration isolator as shown in FIG. 1 using only the elastic stopper member 6 shown in FIGS. 9 and 10). FIG. 11 shows a comparison of the load deflection between the vibration isolator using the elastic stopper member 6 having the horizontal hole 7 and the vertical hole 71 formed in the embodiment of the present invention. The static spring constant Ks and the dynamic spring constant Kd of Comparative Examples 1 and 2 and Example are as shown in Table 1 below.
[0018]
[Table 1]

[0019]
Details of the example and the comparative example 2 shown in the graph of FIG. 11 are as shown in the enlarged graph of FIG. In the preload line on the graph shown in FIG. 12, the internal heat generation is different between Comparative Example 2 and the embodiment even if the static spring constant Ks is the same.
[0020]
【The invention's effect】
As described above, according to the present invention, the elastic stopper member is provided with the horizontal hole or the hollow portion in the left-right direction so that the elastic stopper member is sheared in the vertical direction and the front-rear direction at the portion between the mounting member and the stopper portion. As a result, shear deformation occurs instead of compressive deformation as in the case of simply increasing the rubber volume, and internal loss is reduced. As a result, the dynamic spring constant can be reduced. Even with the same static spring constant, transmission of engine vibration and sound to the vehicle interior can be suppressed as compared with the related art. In particular, it was confirmed that there was an effect in the muffled sound range (dynamic spring constant Kd100). Further, in the case where the elastic stopper member is formed in a mountain shape at the contact portion with the stopper portion, the static spring constant is also low. In the case where a plurality of lateral holes or hollow portions are provided, the shear deformation increases, and the dynamic spring constant can be further reduced. Further, in the case where the vertical hole is provided at the center of the portion where the shear deformation occurs, and the side hole or the hollow portion is provided on both sides thereof, the shear deformation is further increased, and the dynamic spring constant is further reduced. Can be.
[Brief description of the drawings]
FIG. 1 is a front view showing a preferred embodiment of the present invention.
FIG. 2 is a plan view of an elastic stopper member.
FIG. 3 is a front view of FIG. 2;
FIG. 4 is a partial front view showing a vertical hole portion having a bottom.
FIG. 5 is a partial front view of a state where a vertical hole has penetrated;
FIG. 6 is a plan view of an elastic stopper member showing another embodiment.
FIG. 7 is a sectional view showing the internal structure of the outer member.
FIG. 8 is a side view of FIG. 1;
FIG. 9 is a front view showing an elastic stopper member of Comparative Example 1.
FIG. 10 is a front view showing an elastic stopper member of Comparative Example 2.
FIG. 11 is a graph comparing load deflections of Comparative Examples 1 and 2 and Examples.
FIG. 12 is a detailed enlarged view of a graph comparing the load deflection between Comparative Example 2 and Example.
FIG. 13 is a sectional view showing a conventional example.
FIG. 14 is a perspective view of a conventional elastic stopper member and a mounting member.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Outer member 2 Inner member 3 Elastic body 4 Mounting member 5 Stopper part 6 Elastic stopper member 7 Side hole

Claims (4)

振動発生部及び振動受部の一方に連結され且つ筒状に形成される外側部材と、
外側部材の内周側に位置した内側部材と、
一端側が内側部材の端部に固定されると共に他端側が振動発生部及び振動受部の他方に連結される取付部材と、
これら内側部材と外側部材との間に配置されて内側部材と外側部材とを弾性変形可能に連結する弾性体と、
外側部材側に設置されて取付部材の一端側と対向して位置すると共に取付部材と当接することで外側部材に対する内側部材の相対移動を制限し得るストッパ部と、
少なくともストッパ部との当接部分を覆うように取付部材の一端側に被せられた弾性変形可能な弾性ストッパ部材とを有する防振装置であって、
弾性ストッパ部材が、取付部材とストッパ部との間の部分での上下方向及び前後方向でせん断変形するように、左右方向に横穴又は中空部を設けることを特徴とする防振装置。An outer member connected to one of the vibration generator and the vibration receiver and formed in a cylindrical shape;
An inner member located on the inner peripheral side of the outer member,
An attachment member having one end fixed to the end of the inner member and the other end connected to the other of the vibration generator and the vibration receiver;
An elastic body disposed between the inner member and the outer member and elastically deformably connecting the inner member and the outer member;
A stopper portion which is provided on the outer member side and is located opposite to one end side of the mounting member and which can limit relative movement of the inner member with respect to the outer member by contacting the mounting member;
An elastic stopper member that is elastically deformable and is covered on one end side of the mounting member so as to cover at least a contact portion with the stopper portion,
A vibration isolator characterized in that a horizontal hole or a hollow portion is provided in the left-right direction so that the elastic stopper member is sheared in the vertical direction and the front-rear direction at a portion between the mounting member and the stopper portion. 弾性ストッパ部材がストッパ部との少なくとも前後方向の当接部分で山形状に形成されていることを特徴とする請求項１に記載の防振装置。The vibration isolator according to claim 1, wherein the elastic stopper member is formed in a mountain shape at least at a contact portion with the stopper portion in the front-rear direction. 横穴又は中空部がそれぞれ複数設けられたことを特徴とする請求項１または２に記載の防振装置。The vibration isolator according to claim 1, wherein a plurality of side holes or hollow portions are provided. 縦穴がせん断変形する部分の中央個所に設けられ、その両側に横穴又は中空部が設けられていることを特徴とする請求項１ないし３のいずれか１項に記載の防振装置。The vibration isolator according to any one of claims 1 to 3, wherein the vertical hole is provided at a central portion of a portion where the shear deformation is performed, and a horizontal hole or a hollow portion is provided on both sides thereof.

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