JPH0610979A - Rubber vibration isolator - Google Patents

Abstract

PURPOSE:To provide a rubber vibration isolator preventing the rubber characteristic from abruptly rising when the rubber surrounding an inner tube collides with a stopper and capable of suppressing the occurrence of vibration and noise. CONSTITUTION:An elastic rubber body 3 is fitted between an inner tube 1 made of a rigid material and an outer metal 2, notch voids 4, 5 are provided at opposite positions of the elastic rubber body 3 across the inner tube 2 to form a rubber vibration isolator, and a notch section 6 is formed at least outside one notch void 5.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】この発明は、自動車や産業用機械
等の動力源の支持に使用される、例えばエンジンマウン
ト等の防振ゴムに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-vibration rubber such as an engine mount, which is used for supporting a power source such as an automobile or an industrial machine.

【０００２】[0002]

【従来の技術】従来のこの種防振ゴムとしては、図５に
示すように、剛性材料よりなる内筒１００と外金具１０
１との間に弾性ゴム体１０２を装置し、弾性ゴム体１０
２の内筒１００を挟んで対向する位置に切欠空所１０
３，１０４を設け、これら切欠空所１０３，１０４の外
金具１０１側にストッパ１０５，１０６を形成したもの
が知られている。図示する例では、内筒１００を下方へ
下げる荷重がかかった状態で振動するので、下方のスト
ッパ１０６に内筒１００を囲むゴムがぶつかる前は、バ
ネ特性がリニアーに上がってゆくが、ストッパ１０６に
ぶつかった後はバネ特性が硬くなる（図４の破線のグラ
フ参照）。図４の符号Ｃで示す個所がストッパ１０６へ
内筒１００を囲むゴムがぶつかった状態を示す。2. Description of the Related Art As a conventional anti-vibration rubber of this kind, as shown in FIG. 5, an inner cylinder 100 and an outer metal fitting 10 made of a rigid material are used.
The elastic rubber body 102 is installed between the
The notch space 10 is provided at a position facing each other with the inner cylinder 100 of 2 interposed therebetween.
It is known that 3, 104 are provided, and stoppers 105, 106 are formed on the outer metal fitting 101 side of these cutout cavities 103, 104. In the example shown in the drawing, the inner cylinder 100 vibrates in a state in which a load is applied downward, so before the rubber surrounding the inner cylinder 100 hits the lower stopper 106, the spring characteristic increases linearly. After hitting, the spring characteristic becomes hard (see the broken line graph in FIG. 4). A portion indicated by a symbol C in FIG. 4 shows a state where the rubber surrounding the inner cylinder 100 hits the stopper 106.

【０００３】[0003]

【発明が解決しようとする課題】従来の防振ゴムは、図
４のグラフに示すように、ストッパ１０６へ内筒１００
を囲むゴムがぶつかり、切欠空所１０４が閉じた状態に
なるとバネ特性が急激に硬くなり、このときに振動、騒
音を発生させていた。In the conventional anti-vibration rubber, as shown in the graph of FIG.
When the rubber surrounding the cylinder hits and the notch cavity 104 is closed, the spring characteristics suddenly become hard, and at this time vibration and noise are generated.

【０００４】そこで、この発明は、内筒を囲むゴムがス
トッパ等にぶつかってバネ特性が急激に立上るのを防
ぎ、振動、騒音の発生を抑えることのできる防振ゴムを
提供することを目的とする。Therefore, an object of the present invention is to provide a vibration-proof rubber capable of preventing the rubber surrounding the inner cylinder from hitting a stopper or the like and suddenly raising the spring characteristic, and suppressing the generation of vibration and noise. And

【０００５】[0005]

【課題を解決するための手段】上述の目的を達成するた
め、この発明は、剛性材料よりなる内筒と外金具との間
に弾性ゴム体を装着し、弾性ゴム体の内筒を挟んで対向
する位置に切欠空所を設けた防振ゴムにおいて、少なく
とも１つの切欠空所の外側に切欠部を形成したものであ
る。In order to achieve the above-mentioned object, according to the present invention, an elastic rubber body is mounted between an inner cylinder made of a rigid material and an outer metal fitting, and the inner cylinder of the elastic rubber body is sandwiched. In a vibration-proof rubber having a cutout space provided at a position facing each other, a cutout portion is formed outside at least one cutout space.

【０００６】[0006]

【実施例】以下に、この発明の好適な実施例を図面を参
照にして説明する。図１に示す第１実施例は、剛性材料
よりなる内筒１と外金具２との間に弾性ゴム体３を装着
し、弾性ゴム体３の内筒１を挟んで対向する位置に切欠
空所４，５を設けてある。切欠空所５の外側に切欠部６
を形成してある。内筒１を囲む弾性ゴム体３は本体ゴム
３０を形成し、切欠空所４の外金具２側にはストッパゴ
ム３１を形成し、切欠空所５と切欠部６との間には中間
ゴム３２を形成するとともに、切欠部６の外金具２側に
はストッパゴム３３を形成してある。図１に示すタイプ
の防振ゴムは、エンジンマウント等として使用されるも
のであり、内筒１を下方へ下げる荷重Ｗがかかってい
る。即ち、本体ゴム３０に荷重Ｗが矢印方向へかかると
本体ゴム３０は変位するが、中間ゴム３２に接触しない
範囲に設計しておく。中程度の入力負荷時は、本体ゴム
３０が中間ゴム３２に接触してバネ特性が若干硬くなり
本体ゴム３０の動きを規制する。さらに、大きな入力負
荷時には中間ゴム３２に本体ゴム３０が接触してバネ特
性が硬くなってからストッパゴム３３へ接触することと
なる。即ち、図４のグラフの実線で示すような特性を示
し、符号Ａの個所が本体ゴム３０が中間ゴム３２に接触
した状態を示し、符号Ｂが中間ゴム３２がストッパゴム
３３に接触した状態を示す。この図４の実線で示すグラ
フからも明らかなように、バネ特性が滑らかに立上り、
破線で示す従来例のようにバネ特性の急激な変化が抑止
される。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings. In the first embodiment shown in FIG. 1, an elastic rubber body 3 is mounted between an inner cylinder 1 made of a rigid material and an outer metal fitting 2, and a cutout space is provided at a position facing each other with the inner cylinder 1 of the elastic rubber body 3 interposed therebetween. Places 4 and 5 are provided. The notch 6 is provided outside the notch 5
Has been formed. The elastic rubber body 3 surrounding the inner cylinder 1 forms a main body rubber 30, a stopper rubber 31 is formed on the outer metal fitting 2 side of the cutout space 4, and an intermediate rubber is formed between the cutout space 5 and the cutout portion 6. 32 is formed, and a stopper rubber 33 is formed on the outer metal fitting 2 side of the cutout portion 6. The anti-vibration rubber of the type shown in FIG. 1 is used as an engine mount or the like, and a load W for lowering the inner cylinder 1 is applied. That is, the body rubber 30 is displaced when the load W is applied to the body rubber 30 in the direction of the arrow, but the body rubber 30 is designed so as not to contact the intermediate rubber 32. When the input load is moderate, the body rubber 30 comes into contact with the intermediate rubber 32, and the spring characteristic is slightly hardened to restrict the movement of the body rubber 30. Further, when a large input load is applied, the body rubber 30 comes into contact with the intermediate rubber 32 and the spring characteristics become harder, and then comes into contact with the stopper rubber 33. That is, the characteristics shown by the solid line in the graph of FIG. Show. As is clear from the graph shown by the solid line in FIG. 4, the spring characteristic rises smoothly,
As in the conventional example shown by the broken line, the rapid change of the spring characteristic is suppressed.

【０００７】図２に示す第２実施例は、外金具２の形状
が第１実施例とは異なり、この外金具２が取付く被取付
部材１０と中間ゴム３２との間に切欠部６を形成してあ
る。この切欠部６に面した被取付部材１０自体が図１に
示すストッパゴム３３の役目をなす。その他同一部材に
は同一符号を付して説明を省略する。The second embodiment shown in FIG. 2 differs from the first embodiment in the shape of the outer metal fitting 2 and has a notch 6 between the member 10 to which the outer metal fitting 2 is mounted and the intermediate rubber 32. Has been formed. The attached member 10 itself facing the notch 6 serves as the stopper rubber 33 shown in FIG. The other same members are designated by the same reference numerals and the description thereof will be omitted.

【０００８】図３に示す第３実施例は、切欠空所４，５
の両方の外側に切欠部６を形成した例を示すものであ
り、この防振ゴムは取付け後に上下何れかに偏った荷重
がかからないタイプのものである。以上説明した何れの
実施例も、一方向に一個所の切欠部６を形成したが、大
きさによっては２以上の切欠部６を形成することもでき
る。２つの切欠部６を同一方向に形成した場合には図４
に示すグラフの符号Ａ，Ｂの個所の他にさらにもう１つ
バネ特性の変曲点が増加する。In the third embodiment shown in FIG. 3, the notch cavities 4,5 are provided.
2 shows an example in which the cutout portions 6 are formed on both outer sides of the above, and this vibration isolating rubber is of a type in which a biased load is not applied to one of the upper and lower sides after attachment. In each of the embodiments described above, one notch 6 is formed in one direction, but two or more notches 6 may be formed depending on the size. When the two cutouts 6 are formed in the same direction, FIG.
In addition to the points of reference characters A and B in the graph shown in FIG. 1, another inflection point of the spring characteristic increases.

【０００９】[0009]

【発明の効果】以上説明したように、この発明によれ
ば、剛性材料よりなる内筒と外金具との間に弾性ゴム体
を装着し、弾性ゴム体の内筒を挟んで対向する位置に切
欠空所を設けた防振ゴムにおいて、少なくとも１つの切
欠空所の外側に切欠部を形成したので、この切欠部側に
入力したとき、内筒を囲むゴムが中間ゴムに接触したと
きと、中間ゴムがストッパゴムに接触したときの２個所
がバネ特性変曲点となり、そのためにバネ特性が急激に
変化することがなくなり、滑らかなバネ特性となり、振
動、騒音の防止に効果が大きい。As described above, according to the present invention, the elastic rubber body is mounted between the inner cylinder made of a rigid material and the outer metal fitting, and the inner cylinder of the elastic rubber body is sandwiched between the opposing positions. In the anti-vibration rubber provided with the cutout space, since the cutout portion is formed outside at least one cutout space, when input is made to the cutout portion side, when the rubber surrounding the inner cylinder contacts the intermediate rubber, When the intermediate rubber comes into contact with the stopper rubber, two points become inflection points of the spring characteristic, so that the spring characteristic does not suddenly change, the spring characteristic becomes smooth, and the effect of preventing vibration and noise is great.

【図面の簡単な説明】[Brief description of drawings]

【図１】この発明の第１実施例を示す断面図。FIG. 1 is a sectional view showing a first embodiment of the present invention.

【図２】第２実施例を示す断面図。FIG. 2 is a sectional view showing a second embodiment.

【図３】第３実施例を示す断面図。FIG. 3 is a sectional view showing a third embodiment.

【図４】従来の防振ゴムとこの発明の第１実施例の防振
ゴムの荷重と撓みとの関係を示すグラフFIG. 4 is a graph showing the relationship between the load and the deflection of the conventional anti-vibration rubber and the anti-vibration rubber of the first embodiment of the present invention.

【図５】従来例を示す断面図。 １ 内筒 ２ 外金具 ３ 弾性ゴム体 ４，５ 切欠空所 ６ 切欠部FIG. 5 is a sectional view showing a conventional example. 1 Inner cylinder 2 Outer metal fitting 3 Elastic rubber body 4, 5 Notch space 6 Notch part

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】 剛性材料よりなる内筒と外金具との間に
弾性ゴム体を装着し、弾性ゴム体の内筒を挟んで対向す
る位置に切欠空所を設けた防振ゴムにおいて、 少なくとも１つの切欠空所の外側に切欠部を形成したこ
とを特徴とする防振ゴム。1. An anti-vibration rubber in which an elastic rubber body is mounted between an inner cylinder made of a rigid material and an outer metal member, and a cutout space is provided at a position facing each other with the inner cylinder of the elastic rubber body sandwiched therebetween. An anti-vibration rubber, characterized in that a notch is formed on the outside of one notch space.