JP4827773B2 - Vibration isolator - Google Patents

Vibration isolator Download PDF

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JP4827773B2
JP4827773B2 JP2007061612A JP2007061612A JP4827773B2 JP 4827773 B2 JP4827773 B2 JP 4827773B2 JP 2007061612 A JP2007061612 A JP 2007061612A JP 2007061612 A JP2007061612 A JP 2007061612A JP 4827773 B2 JP4827773 B2 JP 4827773B2
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elastic body
exposed portion
rubber elastic
mounting bracket
bracket
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JP2008223850A (en
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和夫 三宅
孝幸 横部
純浩 吉川
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Kurashiki Kako Co Ltd
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  • Combined Devices Of Dampers And Springs (AREA)
  • Vibration Prevention Devices (AREA)

Description

本発明は、例えば自動車用のエンジンマウントのような防振装置に関し、特に、取付金具にゴム弾性体を加硫一体化成形してなるものの構造に係る。   The present invention relates to an anti-vibration device such as an engine mount for automobiles, and more particularly to a structure in which a rubber elastic body is vulcanized and integrally formed on a mounting bracket.

従来より、この種の防振装置としては、例えば特許文献１、２等に開示されるような自動車用の縦型エンジンマウントが公知である。本発明の実施形態に係る図１〜３を参照して説明すると、一般的に縦型のエンジンマウントＭは、円筒状のハウジング部１０を有する金属製のエンジンブラケット１（取付金具）と、そのハウジング部１０から筒軸Ｚの方向に離れて配置され、車体側のブラケットに連結される金具２とを備え、それらがゴム弾性体３によって一体的に連結されている。   Conventionally, as this type of vibration isolator, for example, a vertical engine mount for an automobile as disclosed in Patent Documents 1 and 2 is known. 1 to 3 according to the embodiment of the present invention, a generally vertical engine mount M includes a metal engine bracket 1 (mounting bracket) having a cylindrical housing portion 10 and its A metal fitting 2 that is disposed away from the housing portion 10 in the direction of the cylinder axis Z and is connected to a bracket on the vehicle body side is provided, and these are integrally connected by a rubber elastic body 3.

また、通常、それらエンジンブラケット１及び金具２は、ゴム弾性体３を加硫成形する際に一体化される（加硫一体化成形）。すなわち、ゴムの成形型（金型）内にエンジンブラケット１や金具２をセットして、ゴム弾性体３となる未加硫ゴム組成物と共に加熱及び加圧することにより、一体化するのである。
特開２００２−３４００８０号公報 特開２００６−３８０１４号公報 Further, the engine bracket 1 and the metal fitting 2 are usually integrated when the rubber elastic body 3 is vulcanized (vulcanized integrated molding). That is, the engine bracket 1 and the metal fitting 2 are set in a rubber mold (mold), and are integrated by heating and pressurizing together with the unvulcanized rubber composition to be the rubber elastic body 3.
JP 2002-340080 JP JP 2006-38014 A

ところで、前記のようなエンジンマウントにおいて所要の防振特性を実現するためには、エンジンブラケットとゴム弾性体との間に高い相対位置精度が求められるから、上述したように金型内にセットするエンジンブラケット１をその一部、好ましくはゴム弾性体３との境界付近において所要の力で押圧して保持（即ち位置決め）する必要がある。   By the way, in order to achieve the required vibration isolation characteristics in the engine mount as described above, high relative positional accuracy is required between the engine bracket and the rubber elastic body, so that it is set in the mold as described above. It is necessary to hold (ie, position) the engine bracket 1 with a required force in a part thereof, preferably in the vicinity of the boundary with the rubber elastic body 3.

しかしながら、そうして金型の一部によって押圧される部分にはゴム組成物が流れないので、エンジンブラケット１には例えばハウジング部１０の端縁部のようなゴム弾性体３との境界付近に、ゴム層により被覆されない金具露出部１０ａが形成されるとともに、この金具露出部１０ａ全体が僅かに凹んで周縁に尖ったエッジが形成されることになり、このエッジが、エンジンマウントＭの使用中にゴム弾性体３を損傷させて、耐久性を低下させる虞れがある。   However, since the rubber composition does not flow in the portion pressed by a part of the mold, the engine bracket 1 is located in the vicinity of the boundary with the rubber elastic body 3 such as the edge of the housing portion 10. The bracket exposed portion 10a that is not covered by the rubber layer is formed, and the entire bracket exposed portion 10a is slightly recessed to form a sharp edge on the periphery. This edge is used during the use of the engine mount M. The rubber elastic body 3 may be damaged and the durability may be reduced.

すなわち、例えば自動車が路面の凹凸を乗り越えるときに、エンジンマウントＭには大きな外力が作用することになるが、これによってゴム弾性体３の主バネ部３０が大きく圧縮されると、その一部が径方向外方に膨出して、前記金具露出部１０ａのエッジに強く押し付けられるようになり（図６(a)参照）、これが繰り返されることによってゴム弾性体３に亀裂を生じるものである。   That is, for example, when the automobile gets over the road surface unevenness, a large external force acts on the engine mount M. When the main spring portion 30 of the rubber elastic body 3 is greatly compressed by this, a part of the force is applied. It bulges outward in the radial direction and comes to be strongly pressed against the edge of the bracket exposed portion 10a (see FIG. 6 (a)). By repeating this, the rubber elastic body 3 is cracked.

本発明は、斯かる点に鑑みてなされたものであり、その目的は、上述したように加硫一体化成形の際に取付金具の一部に露出部が形成され、且つその周縁に尖ったエッジが形成されることに着目して、このエッジとの圧接によるゴム弾性体の損傷、ひいては防振装置の耐久性の低下を防止することにある。   The present invention has been made in view of such a point, and the object thereof is to form an exposed portion on a part of the mounting bracket and to sharpen the periphery thereof during the vulcanization integrated molding as described above. Focusing on the fact that the edge is formed, it is to prevent the rubber elastic body from being damaged by the pressure contact with the edge, and thus the deterioration of the durability of the vibration isolator.

前記の目的を達成するために、本願の請求項１の発明は、金型内に装填した取付金具にゴム弾性体を加硫一体化成形してなる防振装置を対象として、前記取付金具にはゴム弾性体の主バネ部との境界に近接して、前記金型の一部により押圧状態で保持されていた部分が、ゴム層により被覆されていない金具露出部として形成されているものとする。そして、このものにおいて、大きな外力を受けてゴム弾性体の主バネ部が圧縮され、その一部分が前記金具露出部の側へ膨出するときに、この膨出部分と金具露出部のエッジとの間に挟まれて両者の圧接を抑制する圧接抑制部材を設けている。   In order to achieve the above object, the invention of claim 1 of the present application is directed to a vibration isolator formed by vulcanizing and integrating a rubber elastic body on a mounting bracket loaded in a mold. Is a part that is held in a pressed state by a part of the mold in the vicinity of the boundary with the main spring part of the rubber elastic body, and is formed as a bracket exposed part that is not covered by the rubber layer. To do. In this case, when the main spring portion of the rubber elastic body receives a large external force and is compressed, and a portion of the main spring portion bulges toward the metal fitting exposed portion, the bulging portion and the edge of the metal fitting exposing portion A pressure-inhibiting member that suppresses the pressure-contact between the two is provided.

前記の構造により、大きな外力を受けてゴム弾性体の主バネ部が圧縮され、その一部が取付金具の露出部の側へ膨出するとき、この膨出部分と金具露出部のエッジとの間に圧接抑制部材が挟まれて、両者の圧接を抑制することになる。よって、ゴム弾性体の膨出部分には亀裂を生じ難くなり、その損傷による防振装置の耐久性の低下を防止することができる。   With the above structure, when the main spring portion of the rubber elastic body is compressed by receiving a large external force and a part of the main spring portion bulges toward the exposed portion of the mounting bracket, the bulging portion and the edge of the bracket exposed portion A pressure-contact suppressing member is sandwiched between them, and the pressure-contact between them is suppressed. Therefore, it is difficult for cracks to occur in the bulged portion of the rubber elastic body, and it is possible to prevent a decrease in durability of the vibration isolator due to the damage.

このような防振装置は自動車用のエンジンマウント等に好適であり、その場合、例えば取付金具が自動車のエンジン側に連結される一方、ゴム弾性体には、自動車の車体側に連結される金具が固定される（請求項８）。   Such an anti-vibration device is suitable for an engine mount for automobiles, in which case, for example, a mounting bracket is coupled to the engine side of the automobile, while a rubber elastic body is coupled to the body side of the automobile. Is fixed (claim 8).

その場合に、取付金具の筒状部には、その外周における周方向の所定範囲に連結腕部が設けられて、ここにエンジン側からの荷重が加わることが多いから、この連結腕部の設けられている範囲において特に大きくゴム弾性体が膨出するようになる。よって、前記連結腕部の設けられている範囲に対応して金具露出部が形成されている場合に、本発明の作用が特に有効なものとなる（請求項７）。   In that case, a connecting arm portion is provided in a predetermined range in the circumferential direction on the outer periphery of the cylindrical portion of the mounting bracket, and loads from the engine side are often applied to the connecting arm portion. The rubber elastic body swells particularly greatly within the range. Therefore, the action of the present invention is particularly effective when the bracket exposed portion is formed corresponding to the range in which the connecting arm portion is provided (Claim 7).

本発明に係る防振装置の構成についてより具体的には、前記取付金具に筒状部があり、その筒軸方向一側端から筒軸に沿って外方に向かい窄むようにゴム弾性体の主バネ部が延びている場合に、金具露出部は、前記筒状部の筒軸方向一側の端縁部に形成されることになり、この場合には、その金具露出部に近接して圧接抑制部材を前記主バネ部の裾部に一体に設けるのがよい（請求項２）。   More specifically, the structure of the vibration isolator according to the present invention has a cylindrical portion in the mounting bracket, and the main part of the rubber elastic body so as to squeeze outward along the cylinder axis from one end in the cylinder axis direction. When the spring portion extends, the bracket exposed portion is formed at the edge of the cylindrical portion on one side in the cylinder axis direction. In this case, the bracket exposed portion is pressed close to the bracket exposed portion. It is preferable to provide a restraining member integrally with the bottom part of the main spring part (Claim 2).

前記のように先窄まりとされたゴム弾性体の主バネ部が、その筒軸の方向に圧縮されて径方向外方に膨出するときには、特に外形の大きな裾部の膨出量が大きくなり、近接する筒状部の端縁部を乗り越えてせり出すようになる。よって、その端縁部に金具露出部が形成されている場合には、そのエッジと前記膨出部分との圧接を抑制するための圧接抑制部材をゴム弾性体の主バネ部の裾部に一体成形すればよく、こうして主バネ部と一体成形すれば、コストの上昇を抑えることができる。   When the main spring portion of the rubber elastic body that has been tapered as described above is compressed in the direction of the cylindrical axis and bulges outward in the radial direction, the bulge amount of the skirt portion having a large outer shape is particularly large. Thus, it gets over the end edge of the adjacent cylindrical portion. Therefore, when the bracket exposed portion is formed at the end edge portion, the pressure contact suppressing member for suppressing the pressure contact between the edge and the bulging portion is integrated with the skirt portion of the main spring portion of the rubber elastic body. What is necessary is just to shape | mold, If a main spring part is integrally molded in this way, the raise of cost can be suppressed.

ここで、前記金具露出部は、上述したように金型内にセットした取付金具の位置決め部であるから、その位置決め保持の安定性を確保するために筒状部の筒軸方向一側の端縁部を或る程度以上の長さに亘って保持する結果として、周方向の所定範囲に亘って前記金具露出部が形成されることになる。   Here, since the bracket exposed portion is the positioning portion of the mounting bracket set in the mold as described above, in order to ensure the stability of the positioning and holding, the end of the cylindrical portion on one side in the cylinder axis direction As a result of holding the edge part over a certain length, the metal fitting exposed part is formed over a predetermined range in the circumferential direction.

そうして或る程度以上の長さに亘って形成された金具露出部の内周に沿って、立壁部を形成すれば（請求項３）、この立壁部によって、ゴム弾性体の膨出部分が金具露出部のエッジに圧接されることをより確実に抑制できる。尚、そうして或る程度の長さに亘って立壁部を形成するのであれば、その方向は型割りの方向に合わせるのがよい。   If a standing wall portion is formed along the inner periphery of the bracket exposed portion formed over a certain length or more (Claim 3), the bulging portion of the rubber elastic body is formed by the standing wall portion. Can be more reliably suppressed from being pressed against the edge of the bracket exposed portion. If the standing wall portion is to be formed over a certain length, the direction should be matched with the mold dividing direction.

また、好ましいのは、前記立壁部の付け根寄りの部位を、当該立壁部のうち当該付け根寄りの部位以外の部位よりも薄肉とすることであり（請求項４）、こうすれば、その立壁部が倒れ易くなって、ゴム弾性体の膨出部分のせり出しを邪魔し難くなるので、立壁部を設けたからといってゴム弾性体の変形が強く制限されることはない。よって、防振装置の本来のバネ特性を損なわないようにすることができる。 Preferably, the portion of the standing wall portion near the base is thinner than the portion of the standing wall portion other than the portion near the root (Claim 4). However, the provision of the standing wall portion does not strongly limit the deformation of the rubber elastic body. Therefore, it is possible to prevent the original spring characteristics of the vibration isolator from being impaired.

また、好ましいのは、前記立壁部の周方向両側端にそれぞれ連続させて、取付金具の露出部を周方向両側から囲むように延出壁部を形成することであり（請求項５）、こうすれば、ゴム弾性体の膨出部分が金具露出部のエッジに圧接されることをより確実に抑制できる。或いは、圧接抑制部材として前記のような立壁部を設けるのではなく、金具露出部の周方向両側端に対応して突起部を形成するだけでも、或る程度の効果は期待できる（請求項６）。   Further, it is preferable that the extending wall portion is formed so as to surround the exposed portion of the mounting bracket from both sides in the circumferential direction so as to be continuous with both ends in the circumferential direction of the standing wall portion. By doing so, it is possible to more reliably suppress the bulging portion of the rubber elastic body from being pressed against the edge of the bracket exposed portion. Alternatively, a certain effect can be expected only by forming protrusions corresponding to both ends in the circumferential direction of the metal fitting exposed portion instead of providing the above-described standing wall portion as the press-contact suppressing member. ).

以上、説明したように、本発明に係る防振装置によると、金型内に装填した取付金具にゴム弾性体を加硫一体化成形する際に、金型の一部により押圧状態で保持される部分が、ゴム弾性体の主バネ部との境界に近接してエッジの尖った金具露出部となることに着目し、大きな外力を受けてゴム弾性体の主バネ部が圧縮され、その一部が前記金具露出部の側へ膨出するときに、この膨出部分と金具露出部のエッジとの間に挟まれて、両者の圧接を抑制する部材を設けたから、ゴム弾性体に亀裂を生じ難くなり、防振装置の耐久性の低下を防止することができる。   As described above, according to the vibration isolator according to the present invention, when the rubber elastic body is vulcanized and integrally formed on the mounting bracket loaded in the mold, it is held in a pressed state by a part of the mold. Note that the exposed part of the rubber elastic body is close to the boundary with the main spring part of the rubber elastic body and becomes an exposed part of the metal fitting with a sharp edge, and the main spring part of the rubber elastic body is compressed by receiving a large external force. Since the member that is sandwiched between the bulging portion and the edge of the bracket exposed portion when the portion bulges toward the bracket exposed portion and suppresses the pressure contact between the two is provided, the rubber elastic body is cracked. It becomes difficult to occur, and the deterioration of the durability of the vibration isolator can be prevented.

以下、本発明の実施形態を図面に基いて説明する。尚、以下の好ましい実施形態の説明は、本質的に例示に過ぎず、本発明、その適用物或いはその用途を制限することを意図するものではない。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature, and is not intended to limit the present invention, its application, or its use.

図１〜３は、本発明に係る防振装置の一実施形態である自動車用のエンジンマウントＭを示す。このエンジンマウントＭは、各々エンジン側及び車体側に取り付けられる取付金具１、２をゴム弾性体３（図１には示さず）と共に加硫一体化成形してなり、図示しない自動車のエンジンと車体との間に介在されるものである。図１は斜め上方から見た斜視図であり、図２は縦断面図、図３は斜め下方からの斜視図である。   1 to 3 show an automobile engine mount M that is an embodiment of a vibration isolator according to the present invention. This engine mount M is formed by integrally vulcanizing mounting brackets 1 and 2 attached to the engine side and the vehicle body side together with a rubber elastic body 3 (not shown in FIG. 1). Between the two. FIG. 1 is a perspective view seen from obliquely above, FIG. 2 is a longitudinal sectional view, and FIG. 3 is a perspective view seen from obliquely below.

エンジン側の取付金具１（以下、エンジンブラケット１と呼ぶ）は、例えばアルミ合金材の鋳物であり、筒軸Ｚを概ね上下方向に向けて配置される概略円筒状のハウジング部１０と、その外周の一側（図２の左側）における周方向の所定範囲（図の例では概略半周に亘る）から筒軸Ｚに対しやや傾斜して延びる概略矩形ブロック状の連結腕部１１と、からなる。この連結腕部１１には、その厚み方向に貫通孔１１ａ，１１ａが設けられていて、図示しないボルト等によりエンジン側の部材に締結されるようになっている。   The engine-side mounting bracket 1 (hereinafter referred to as the engine bracket 1) is, for example, an aluminum alloy casting, and includes a substantially cylindrical housing portion 10 that is disposed with the cylinder axis Z substantially in the vertical direction, and an outer periphery thereof. And a connecting arm portion 11 in the form of a substantially rectangular block extending slightly inclined with respect to the cylinder axis Z from a predetermined range in the circumferential direction on one side (the left side in FIG. 2) (in the example shown in the figure, extending over a substantially half circumference). The connecting arm portion 11 is provided with through holes 11a and 11a in the thickness direction, and is fastened to a member on the engine side by a bolt (not shown) or the like.

一方、車体側の取付金具２は、例えば鋼板を成形加工してなり、前記エンジンブラケット１のハウジング部１０の下方に配置されて、筒軸Ｚと概略同心に位置付けられる下向き開放状の椀形部２０と、この椀形部２０の下端開口縁における一側（図２の右部）から径方向外方に向かって略水平に延びる一方、反対側では筒軸Ｚに沿って下方に延びるＬ字状のプレート部２１とを有している（以下、プレート金具２と呼ぶ）。このプレート金具２のプレート部２１が折り曲げられて、図示しない車体側の部材に組み付けられる。   On the other hand, the mounting bracket 2 on the vehicle body side is formed by, for example, forming a steel plate, and is disposed below the housing portion 10 of the engine bracket 1 and is a downwardly open bowl-shaped portion positioned substantially concentrically with the cylinder axis Z. 20 and an L-shape that extends substantially horizontally from one side (the right part in FIG. 2) at the lower end opening edge of the bowl-shaped portion 20 outward in the radial direction, and extends downward along the cylinder axis Z on the opposite side. (Hereinafter, referred to as a plate fitting 2). The plate portion 21 of the plate fitting 2 is bent and assembled to a vehicle body side member (not shown).

また、ゴム弾性体３は、全体として摺り鉢状に形成されて、前記エンジンブラケット１のハウジング部１０の下部とプレート金具２の椀形部２０とを連結している。すなわち、前記ハウジング部１０の下部内周には下方に拡径するテーパ状面が形成されていて、この面を覆ってゴム弾性体３の上部が加硫接着されている。そこから内周、外周共に窄まりながら下方に延びる厚肉の部分がゴム弾性体３の主バネ部３０であり、その下端に連繋してさらに下方に延びる延出部３１が、プレート金具２の椀形部２０の外周を覆って加硫接着されている。   The rubber elastic body 3 is formed in a bowl shape as a whole, and connects the lower portion of the housing portion 10 of the engine bracket 1 and the bowl-shaped portion 20 of the plate fitting 2. That is, a tapered surface that expands downward is formed on the inner periphery of the lower portion of the housing portion 10, and the upper portion of the rubber elastic body 3 is vulcanized and bonded to cover this surface. A thick portion extending downward from the inner and outer periphery of the rubber elastic body 3 is narrowed from the main spring portion 30, and an extension portion 31 extending further downward is connected to the lower end of the rubber plate 3. The outer periphery of the bowl-shaped part 20 is covered and vulcanized.

前記のように下窄まりに形成された主バネ部３０の内方には上方に開口する空間が形成され、その上方開口を閉塞するようにオリフィス盤４及びダイヤフラム５が配設されている。すなわち、エンジンブラケット１のハウジング部１０は、その上部において特に内周が拡径されて、下部との間に環状の段部が形成されており、この段部に上方からオリフィス盤４が載置され、それを上方から覆うようにダイヤフラム５が嵌め込まれてている。ダイヤフラム５の外周寄りの部位は比較的厚肉とされ、オリフィス盤４の外周全体を覆っている。   A space that opens upward is formed inside the main spring portion 30 that is formed to be narrowed as described above, and the orifice plate 4 and the diaphragm 5 are disposed so as to close the upper opening. That is, the housing portion 10 of the engine bracket 1 has an inner periphery whose diameter is particularly enlarged at the upper portion, and an annular step portion is formed between the lower portion and the orifice platen 4 placed on the step portion from above. The diaphragm 5 is fitted so as to cover it from above. The portion near the outer periphery of the diaphragm 5 is relatively thick and covers the entire outer periphery of the orifice plate 4.

そうしてダイヤフラム５により上方を、また、下方及び外周囲をゴム弾性体３の主バネ部３０によってそれぞれ囲まれて、エンジンマウントＭの内部には液室Ｆが形成されている。この液室Ｆの体積は主バネ部３０の弾性変形に伴い変化し、これによりエンジンマウントＭへの入力が吸収、緩和される。図の例では液室Ｆは、オリフィス盤４によって下方の主液室と上方の副液室とに区画されており、これら主液室及び副液室を相互に連通するオリフィス通路４ａが、オリフィス盤４の外周寄りの部位に螺旋状に形成されている。   Thus, a liquid chamber F is formed inside the engine mount M, with the diaphragm 5 surrounding the upper side, and the lower side and the outer periphery by the main spring portion 30 of the rubber elastic body 3. The volume of the liquid chamber F changes with the elastic deformation of the main spring portion 30, thereby absorbing and relaxing the input to the engine mount M. In the example shown in the figure, the liquid chamber F is divided into a lower main liquid chamber and an upper sub liquid chamber by an orifice board 4, and an orifice passage 4 a communicating these main liquid chamber and sub liquid chamber with each other is provided as an orifice. It is formed in a spiral shape at a portion near the outer periphery of the board 4.

尚、図１、３にのみ示すが、前記エンジンブラケット１のハウジング部１０の外周には、筒軸Ｚに沿って見て連結腕部１１の延びる方向に直交する方向の両側に、各々厚肉のゴム層６，６が加硫接着されており、これが図示しない車体側のストッパ部材と当接するストッパゴムを構成している。   Although shown only in FIGS. 1 and 3, the outer periphery of the housing portion 10 of the engine bracket 1 is thick on both sides in a direction orthogonal to the extending direction of the connecting arm portion 11 when viewed along the cylinder axis Z. The rubber layers 6 and 6 are vulcanized and bonded, and this constitutes a stopper rubber that comes into contact with a stopper member on the vehicle body (not shown).

そして、本発明の特徴部分として、エンジンブラケット１のハウジング部１０の下端には、ゴム弾性体３の主バネ部３０の裾部（エンジンマウントＭを上下逆転させて示す図３において、山の裾野のように広がる部分）を取り囲む端縁部、即ち主バネ部３０との境界に近接する部位に、ゴムにより被覆されていない金具露出部１０ａが形成されているとともに、この金具露出部１０ａの内周に沿って、図４に拡大して示すように主バネ部３０の裾部に立壁部３２が一体成形されている。   As a characteristic part of the present invention, the lower end of the housing part 10 of the engine bracket 1 is provided at the bottom part of the main spring part 30 of the rubber elastic body 3 (in FIG. 3 showing the engine mount M turned upside down) A metal exposed portion 10a not covered with rubber is formed at a portion close to the edge of the peripheral portion, that is, the boundary with the main spring portion 30, and the inside of the metal exposed portion 10a. Along the circumference, as shown in an enlarged view in FIG. 4, the standing wall portion 32 is integrally formed at the skirt portion of the main spring portion 30.

前記金具露出部１０ａは、図５を参照して以下に述べるような加硫一体化成形の際に、金型Ｄの一部によって強く押圧されていた結果として、エンジンブラケット１のハウジング部１０の下端縁部に周方向の所定の範囲に亘って形成されるものである。   The bracket exposed portion 10a is strongly pressed by a part of the mold D during vulcanization integrated molding as described below with reference to FIG. The lower end edge is formed over a predetermined range in the circumferential direction.

すなわち、エンジンマウントＭの製造工程においては、図５に概略を示すようにエンジンブラケット１やプレート金具２、及び所定量の未加硫ゴム組成物を金型Ｄ内にセットし、加熱及び加圧して加硫一体化成形するのであるが、その際、特にエンジンブラケット１とゴム弾性体３との間には高い相対位置精度が求められるので、基準面となるハウジング部１０の上端及び下端においてそれぞれ周方向の所定範囲を、上型ｄ１及び中間割型ｄ４，ｄ５により強く押圧保持して位置決めする。   That is, in the manufacturing process of the engine mount M, as shown schematically in FIG. 5, the engine bracket 1, the plate fitting 2, and a predetermined amount of unvulcanized rubber composition are set in the mold D, and heated and pressurized. In this case, since high relative positional accuracy is particularly required between the engine bracket 1 and the rubber elastic body 3, at the upper end and the lower end of the housing portion 10 serving as a reference surface, respectively. The predetermined range in the circumferential direction is positioned by pressing and holding strongly with the upper mold d1 and the middle split molds d4 and d5.

そうして金型Ｄ内に保持するエンジンブラケット１の位置決めの安定性を確保するためには、そのハウジング部１０の上端及び下端においてそれぞれ周方向に所定の長さ（例えば２〜３ｃｍ）以上を保持することが望ましいが、こうして強く押圧して保持する部位にはゴム組成物が流れないので、ハウジング部１０の上下両端にはそれぞれ周方向に前記所定の長さに亘ってゴム層により被覆されない金具露出部１０ａが形成されることになる。この金具露出部１０ａは、前記のように強く押圧保持されることから、それ全体が僅かに凹んで周縁に尖ったエッジ１０ｂが形成される（図４に明示する）。   Thus, in order to ensure the positioning stability of the engine bracket 1 held in the mold D, a predetermined length (for example, 2 to 3 cm) or more in the circumferential direction is provided at the upper end and the lower end of the housing portion 10 respectively. Although it is desirable to hold the rubber composition, the rubber composition does not flow in the portion to be pressed and held in this manner. Therefore, the upper and lower ends of the housing portion 10 are not covered with the rubber layer over the predetermined length in the circumferential direction. The bracket exposed portion 10a is formed. Since the metal fitting exposed portion 10a is strongly pressed and held as described above, an edge 10b that is slightly recessed and sharp at the periphery is formed (illustrated in FIG. 4).

このようなエンジンマウントＭを搭載した自動車が路面の凹凸を乗り越えて、車体が上下に揺すられるときには、大きな外力を受けてゴム弾性体３の主バネ部３０が筒軸Ｚ方向に圧縮される。このとき、特に連結腕部１１に対応する部分の圧縮変形が大きくなって、その裾部が径方向外方に大きく膨出し、図６(a)に模式的に示すように、近接するハウジング部１０の下端縁部（図では上下逆転させて示している）を乗り越えるように、せり出すことになる。   When an automobile equipped with such an engine mount M gets over the unevenness of the road surface and the vehicle body is shaken up and down, the main spring portion 30 of the rubber elastic body 3 is compressed in the direction of the cylinder axis Z by receiving a large external force. At this time, particularly, the compression deformation of the portion corresponding to the connecting arm portion 11 increases, and the skirt portion bulges outward in the radial direction, and as shown schematically in FIG. It protrudes so that it may get over 10 lower end edge parts (shown upside down in the figure).

こうしてせり出すゴム弾性体３の膨出部分は、前記したようにハウジング部１０の下端縁部に形成されている金具露出部１０ａのエッジ１０ｂに強く押し付けられる（圧接）ようになり、これが繰り返されるとゴム弾性体３に亀裂を生じる虞れがあるが、これに対し、この実施形態では、前記のようにせり出す主バネ部３０の膨出部分と金具露出部１０ａのエッジ１０ｂとの間に挟まれるように、その金具露出部１０ａの内周に沿って立壁部３２を設けており、この立壁部３２が、図６(b)に模式的に示すように、ゴム弾性体３の膨出部分と金具露出部１０ａのエッジ１０ｂとの間に挟まれて、両者の圧接を抑制するようになっている。   The bulging portion of the rubber elastic body 3 protruding in this way comes to be strongly pressed (pressed) against the edge 10b of the metal fitting exposed portion 10a formed at the lower end edge of the housing portion 10 as described above, and this is repeated. The rubber elastic body 3 may be cracked. In contrast, in this embodiment, the rubber elastic body 3 is sandwiched between the bulging portion of the main spring portion 30 protruding and the edge 10b of the metal fitting exposed portion 10a. As shown in FIG. 6B, the standing wall portion 32 is provided along the inner periphery of the metal fitting exposed portion 10a. It is sandwiched between the edge 10b of the metal fitting exposed portion 10a and suppresses the pressure contact between them.

したがって、この実施形態に係る防振装置としてのエンジンマウントＭによると、前記のように大きな外力を受けてゴム弾性体３の主バネ部３０が大きく圧縮変形し、その一部が径方向外方に大きく膨出しても、この膨出部分がエンジンブラケット１の金具露出部１０ａのエッジ１０ｂに圧接されることがなく、この圧接の繰り返しによってゴム弾性体３に亀裂を生じることがない。よって、エンジンマウントＭの耐久性の低下が防止される。   Therefore, according to the engine mount M as the vibration isolator according to this embodiment, the main spring portion 30 of the rubber elastic body 3 is greatly compressed and deformed by receiving a large external force as described above, and a part thereof is radially outward. Even if it bulges greatly, the bulging portion is not pressed against the edge 10b of the bracket exposed portion 10a of the engine bracket 1, and the rubber elastic body 3 is not cracked by repeating this pressing. Therefore, a decrease in durability of the engine mount M is prevented.

また、そうして主バネ部３０の膨出部分とハウジング部１０の金具露出部１０ａとの間に挟まれる立壁部３２は、図示の如く付け根寄りの部分が相対的に薄肉とされており、比較的に容易に倒れるようになっているので、主バネ部３０の膨出をあまり邪魔することがない。すなわち、この立壁部３２を設けたことによってゴム弾性体３の主バネ部３０の変形が強く制限されることはなく、エンジンマウントＭの本来のバネ特性を維持することができる。   Further, the standing wall portion 32 sandwiched between the bulging portion of the main spring portion 30 and the bracket exposed portion 10a of the housing portion 10 is relatively thin at the base portion as shown in the figure, Since it falls relatively easily, it does not disturb the bulging of the main spring portion 30 so much. That is, by providing the standing wall portion 32, the deformation of the main spring portion 30 of the rubber elastic body 3 is not strongly restricted, and the original spring characteristics of the engine mount M can be maintained.

さらに、この実施形態では、図３に明らかなように、立壁部３２が概ね連結腕部１１の幅方向に延びており、これは、図５に示す中間割型ｄ４，ｄ５の型割りの方向と概ね合致している。よって、立壁部３２を設けたことによって型割りが困難になることもない。   Further, in this embodiment, as is apparent from FIG. 3, the standing wall portion 32 extends substantially in the width direction of the connecting arm portion 11, which is the direction of the splitting of the intermediate split molds d4 and d5 shown in FIG. Is generally consistent with Therefore, it is not difficult to split the mold by providing the standing wall portion 32.

尚、前記立壁部３２には、例えば図６(c)に示すように、金具露出部１０ａのエッジ１０ｂに押し付けられる部位に窪みを設けてもよく、こうすれば、立壁部３２自体に亀裂が生じることも抑制される。   For example, as shown in FIG. 6 (c), the standing wall portion 32 may be provided with a depression at a portion pressed against the edge 10b of the metal fitting exposed portion 10a. In this way, the standing wall portion 32 itself is cracked. Occurrence is also suppressed.

一方で、必ずしも前記実施形態のように立壁部３２の付け根寄りの部分を薄肉に形成する必要はない。また、例えば図７に示すように、立壁部３２の周方向両側端にそれぞれ連続させて、金具露出部１０ａを周方向両側から囲むように延出壁部３２ａ，３２ａを形成してもよい。こうすれば、ゴム弾性体３の膨出部分と金具露出部１０ａのエッジ１０ｂとの圧接をより確実に抑制できる。   On the other hand, it is not always necessary to form the portion near the base of the standing wall portion 32 as in the above embodiment. Further, for example, as shown in FIG. 7, extended wall portions 32 a and 32 a may be formed so as to be continuous with both ends in the circumferential direction of the standing wall portion 32 so as to surround the bracket exposed portion 10 a from both sides in the circumferential direction. If it carries out like this, the press-contact of the bulging part of the rubber elastic body 3 and the edge 10b of the metal fitting exposed part 10a can be suppressed more reliably.

或いは、前記のようにゴム弾性体３の膨出部分と金具露出部１０ａのエッジ１０ｂとの圧接を抑制するための部材として、必ずしも金具露出部１０ａの内周側に沿う立壁部３２を設ける必要はなく、例えば図８に一例を示すように、金具露出部１０ａの周方向両側端に対応してそれぞれ突起部３３，３３を形成するだけでも或る程度の効果は期待できる。   Alternatively, as described above, as a member for suppressing the pressure contact between the bulging portion of the rubber elastic body 3 and the edge 10b of the bracket exposed portion 10a, it is necessary to provide the standing wall portion 32 along the inner peripheral side of the bracket exposed portion 10a. For example, as shown in an example in FIG. 8, a certain degree of effect can be expected only by forming the protrusions 33 and 33 corresponding to both ends in the circumferential direction of the metal fitting exposed portion 10a.

さらに、前記の実施形態では、本発明を縦型の液封エンジンマウントＭに適用した例を示したが、これに限定されることはなく、横型のエンジンマウントにも本発明を適用可能であることは勿論、液封タイプでないエンジンマウントにも適用可能であり、さらには、例えば自動車用のサスペンションブッシュ等、エンジンマウント以外の防振装置にも適用可能である。   Furthermore, in the above-described embodiment, the example in which the present invention is applied to the vertical liquid-sealed engine mount M has been described. However, the present invention is not limited to this, and the present invention can also be applied to a horizontal engine mount. Of course, the present invention can also be applied to an engine mount that is not a liquid seal type, and can also be applied to a vibration isolator other than the engine mount, such as a suspension bush for an automobile.

以上、説明したように、本発明は、取付金具とゴム弾性体とを加硫一体化成形してなる防振装置において、極めて簡単な構成でゴム弾性体の亀裂発生を防止し、耐久性を向上できるものであり、産業上の利用可能性は高い。   As described above, the present invention is an anti-vibration device in which a mounting bracket and a rubber elastic body are integrally formed by vulcanization, and prevents cracking of the rubber elastic body with a very simple configuration, thereby improving durability. It can be improved and has high industrial applicability.

本発明の実施形態に係るエンジンマウントの外観を示す斜視図である。It is a perspective view which shows the external appearance of the engine mount which concerns on embodiment of this invention. 同エンジンマウントの内部構造を示す縦断面図である。It is a longitudinal cross-sectional view which shows the internal structure of the same engine mount. 同エンジンマウントを上下逆転させて発明の要部を示す図１相当図である。FIG. 2 is a view corresponding to FIG. 1 showing a main part of the invention by turning the engine mount upside down. 同エンジンマウントにおける発明の要部を拡大して示す図である。It is a figure which expands and shows the principal part of invention in the same engine mount. 同エンジンマウントを加硫一体化成形する金型の概略構成を示す斜視図である。It is a perspective view which shows schematic structure of the metal mold | die which vulcanize-integrates and forms the engine mount. ゴム弾性体の主ゴム部の膨出状態を示す模式図であり、(a)は従来までのものを、(b)は本発明の実施形態を、また、(c)は他の変形例を、それぞれ示す。It is a schematic diagram showing a bulging state of the main rubber portion of the rubber elastic body, (a) is the conventional one, (b) is an embodiment of the present invention, (c) is another modified example , Respectively. 立壁部の両側に延出壁部を設けた他の実施形態に係る図４相当図である。FIG. 5 is a view corresponding to FIG. 4 according to another embodiment in which extended wall portions are provided on both sides of the standing wall portion. 立壁部に代えて金具露出部の両側に突起部を設けた他の実施形態に係る図４相当図である。FIG. 5 is a view corresponding to FIG. 4 according to another embodiment in which protrusions are provided on both sides of the bracket exposed portion instead of the standing wall portion.

Ｍ エンジンマウント（防振装置）
１ エンジンブラケット（取付金具）
１０ ハウジング部（筒状部）
１０ａ 金具露出部
１１ 連結腕部
２ プレート金具（金具）
３ ゴム弾性体
３０ 主バネ部
３２ 立壁部（圧接抑制部材）
３２ａ 延出壁部
３３ 突起部
Ｄ 金型
Ｚ 筒軸 M engine mount (anti-vibration device)
1 Engine bracket (mounting bracket)
10 Housing part (tubular part)
10a bracket exposed portion 11 connecting arm portion 2 plate bracket (metal bracket)
3 Rubber elastic body 30 Main spring part 32 Standing wall part (pressure contact suppressing member)
32a Extension wall 33 Protrusion D Mold Z Tube axis

Claims (8)

金型内に装填した取付金具にゴム弾性体を加硫一体化成形してなる防振装置であって、
前記取付金具には、前記ゴム弾性体の主バネ部との境界に近接して、前記金型の一部により押圧状態で保持されていた部分が、ゴム層により被覆されていない金具露出部として形成され、
外力を受けて前記ゴム弾性体の主バネ部が圧縮され、前記金具露出部の側へ膨出するときに、この膨出部分と金具露出部のエッジとの間に挟まれて両者の圧接を抑制する圧接抑制部材が設けられている、ことを特徴とする防振装置。 A vibration isolator formed by integrally vulcanizing a rubber elastic body on a mounting bracket loaded in a mold,
In the mounting bracket, a portion that is held in a pressed state by a part of the mold in the vicinity of the boundary with the main spring portion of the rubber elastic body is a bracket exposed portion that is not covered with a rubber layer. Formed,
When the main spring portion of the rubber elastic body is compressed by receiving an external force and bulges toward the metal fitting exposed portion, it is sandwiched between the bulging portion and the edge of the metal fitting exposed portion so that the pressure contact therebetween is achieved. An anti-vibration device characterized in that a press-contact suppressing member is provided. 取付金具には筒状部があり、
ゴム弾性体の主バネ部は、前記筒状部の筒軸方向一側端から筒軸に沿って外方に向かい窄むように延びており、
前記取付金具の露出部は、前記筒状部の筒軸方向一側の端縁部に形成され、
圧接抑制部材は、前記金具露出部に近接して主バネ部の裾部に一体に設けられている、請求項１に記載の防振装置。 The mounting bracket has a cylindrical part,
The main spring part of the rubber elastic body extends from the one side end of the cylindrical part in the cylinder axis direction so as to be constricted outward along the cylinder axis,
The exposed portion of the mounting bracket is formed at an edge portion on one side of the cylindrical portion in the cylinder axis direction,
2. The vibration isolator according to claim 1, wherein the press contact suppressing member is provided integrally with a skirt portion of the main spring portion in proximity to the metal fitting exposed portion. 取付金具の露出部は、周方向の所定範囲に亘って形成され、
圧接抑制部材は、前記金具露出部の内周に沿って形成された立壁部である、請求項２に記載の防振装置。 The exposed portion of the mounting bracket is formed over a predetermined range in the circumferential direction,
The anti-vibration device according to claim 2, wherein the pressure-contact suppressing member is a standing wall portion formed along an inner periphery of the metal fitting exposed portion. 立壁部の付け根寄りの部位が、当該立壁部のうち当該付け根寄りの部位以外の部位よりも薄肉とされている、請求項３に記載の防振装置。 The vibration isolator according to claim 3 , wherein a portion of the standing wall portion near the base is thinner than a portion of the standing wall portion other than the portion near the root . 立壁部の周方向両側端にそれぞれ連続して、金具露出部を周方向両側から囲むように延出壁部が形成されている、請求項３に記載の防振装置。   The vibration isolator according to claim 3, wherein the extending wall portion is formed so as to surround each of both ends in the circumferential direction of the standing wall portion so as to surround the metal exposed portion from both sides in the circumferential direction. 取付金具の露出部は、周方向の所定範囲に亘って形成され、
圧接抑制部材は、前記金具露出部の周方向両側端に対応して形成された突起部である、請求項２に記載の防振装置。 The exposed portion of the mounting bracket is formed over a predetermined range in the circumferential direction,
The anti-vibration device according to claim 2, wherein the pressure-contact suppressing member is a protrusion that is formed corresponding to both circumferential ends of the metal-fitting exposed portion. 取付金具の筒状部には、その外周における周方向の所定範囲に連結腕部が設けられるとともに、筒軸方向一側の端縁部には周方向について前記所定範囲に対応する範囲内に金具露出部が形成されている、請求項２〜６のいずれか１つに記載の防振装置。   The cylindrical portion of the mounting bracket is provided with a connecting arm portion in a predetermined range in the circumferential direction on the outer periphery thereof, and the metal fitting within a range corresponding to the predetermined range in the circumferential direction is provided on the edge portion on one side in the cylindrical axis direction. The vibration isolator according to any one of claims 2 to 6, wherein an exposed portion is formed. 取付金具が自動車のエンジン側に連結される一方、
ゴム弾性体には、自動車の車体側に連結される金具が固定されている、請求項１〜７のいずれか１つに記載の防振装置。 While the mounting bracket is connected to the engine side of the car,
The vibration isolator according to any one of claims 1 to 7, wherein a metal fitting connected to the vehicle body side of the automobile is fixed to the rubber elastic body.
JP2007061612A 2007-03-12 2007-03-12 Vibration isolator Expired - Fee Related JP4827773B2 (en)

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