JP2008025745A

JP2008025745A - Vibration isolator

Info

Publication number: JP2008025745A
Application number: JP2006200070A
Authority: JP
Inventors: Kosuke Nakayama; 浩佑中山
Original assignee: Toyo Tire and Rubber Co Ltd
Current assignee: Toyo Tire Corp
Priority date: 2006-07-21
Filing date: 2006-07-21
Publication date: 2008-02-07

Abstract

【課題】ストッパ金具の角部における極めて小さな亀裂発生を抑制して耐久性を向上する。
【解決手段】本体金具１２の上端開口部１２Ａに取り付けられて上側取付金具１４の上下方向の変位に対するストッパ作用を果たすストッパ金具４４を備えた防振装置１０において、ストッパ金具４４が、防振基体１６の周りを取り囲む筒状部４６と、その上端から角部４８を介して内向きに延びてストッパ用の当接部を構成するストッパ板部５０とを備えてなり、該角部４８を、筒状部４６からストッパ板部５０に向けて円弧状に湾曲する第１湾曲部５６と、ストッパ板部５０から筒状部４６に向けて円弧状に湾曲する第２湾曲部５８と、これら第１及び第２湾曲部５６，５８を連結するストレート状の傾斜部６０とで構成する。
【選択図】図１An object of the present invention is to improve durability by suppressing the occurrence of extremely small cracks at the corners of a stopper fitting.
In a vibration isolator 10 having a stopper fitting 44 attached to an upper end opening 12A of a body fitting 12 and serving as a stopper against a vertical displacement of an upper attachment fitting 14, the stopper fitting 44 is provided with an anti-vibration base. 16 is provided with a cylindrical portion 46 surrounding the periphery of 16 and a stopper plate portion 50 that extends inward from the upper end of the cylindrical portion 46 via a corner portion 48 to form a stopper contact portion. A first curved portion 56 that curves in an arc shape from the tubular portion 46 toward the stopper plate portion 50, a second curved portion 58 that curves in an arc shape from the stopper plate portion 50 toward the tubular portion 46, and the second curved portion 58. The first and second curved portions 56 and 58 are connected to each other and a straight inclined portion 60 that connects the first and second curved portions 56 and 58.
[Selection] Figure 1

Description

本発明は、防振装置に関するものである。 The present invention relates to a vibration isolator.

自動車エンジン等の振動体を、その振動を車体等の支持体に伝達させないように支承するマウントなどの防振装置においては、ゴム弾性体である防振基体の一定限度以上の変形を防止するためにストッパ機構が設けられている。 In an anti-vibration device such as a mount that supports a vibration body such as an automobile engine so that the vibration is not transmitted to a support body such as a vehicle body, in order to prevent deformation of the vibration-proof base that is a rubber elastic body beyond a certain limit. Is provided with a stopper mechanism.

例えば、支持体側に取り付けられる筒状胴部を有する本体金具と、エンジン等の振動体側に取り付けられる上側取付金具とが、ゴム弾性体からなる防振基体を介して結合されてなる防振装置において、振動に伴う防振基体の変形による上側取付金具の一定以上の大変位を規制するため、上側取付金具に径方向に突出するストッパ用フランジを設ける一方、本体金具に防振基体の外方を前記フランジの上方にまで延びる筒形のストッパ金具を固定し、該ストッパ金具の筒状部の上端部を内向きに折曲形成してストッパ板部とし、このストッパ板部を前記フランジとその上方に取付固定される振動体側の部材との間に位置させ、これにより、上下方向の大変位に対してストッパ板部が上側取付金具のストッパ用フランジと振動体側の部材に当接することでストッパ作用を果たすように構成されたものが公知である（下記特許文献１〜４参照）。 For example, in a vibration isolator in which a main body metal fitting having a cylindrical body portion attached to the support side and an upper attachment metal fitting attached to the vibration body side of an engine or the like are coupled via a vibration isolating base made of a rubber elastic body. In order to restrict large displacement of the upper mounting bracket beyond a certain level due to deformation of the vibration isolating base due to vibration, the upper mounting bracket is provided with a stopper flange that protrudes in the radial direction, while the main body bracket is provided with an outer side of the vibration isolating base. A cylindrical stopper fitting extending to above the flange is fixed, and the upper end portion of the cylindrical portion of the stopper fitting is bent inward to form a stopper plate portion. The stopper plate portion is used as the flange and the upper portion thereof. So that the stopper plate abuts against the stopper flange of the upper mounting bracket and the member on the vibrating body side with respect to large vertical displacement. It is known that is configured to perform the stopper function by (see below Patent Documents 1 to 4).

ところで、近年、自動車においては低燃費化の要請が強く、そのため、自動車メーカーからの車両用部品に対する軽量化の要求も日毎に厳しくなっている。このような状況下、上記ストッパ金具の素材を鉄からアルミニウムに置き換えることが提案されている（下記特許文献１，２参照）。
特開２００４−１６２７６２号公報ＷＯ２００４／０５１１１３Ａ１特開２００５−１６３９１９号公報特開２００３−１１３８８８号公報 By the way, in recent years, there has been a strong demand for lower fuel consumption in automobiles, and therefore, demands for weight reduction of vehicle parts from automobile manufacturers have become stricter every day. Under such circumstances, it has been proposed to replace the material of the stopper fitting from iron to aluminum (see Patent Documents 1 and 2 below).
JP 2004-162762 A WO2004 / 051113A1 JP 2005-163919 A JP 2003-113888 A

上記のようにストッパ金具をアルミニウム製にした場合、搭載車両などによっては、耐久性を損なう場合があり、すなわち、上下方向に所定荷重を繰り返し負荷する耐久試験において、ストッパ板部と筒状部との間の角部に極めて小さな亀裂が発生することがある。 When the stopper fitting is made of aluminum as described above, the durability may be impaired depending on the mounted vehicle.In other words, in the durability test in which a predetermined load is repeatedly applied in the vertical direction, the stopper plate portion and the cylindrical portion Very small cracks may occur at the corners between the two.

この点について詳述すると、従来のストッパ金具において、ストッパ板部１０１と筒状部１０２との間の角部１０３は、軸方向断面において単一の円弧状に湾曲する湾曲部として形成されている（図１４参照）。このストッパ金具は、一般にプレス成形により形成されるため、ストッパ板部１０１や筒状部１０２での厚みｔ１，ｔ２に対して、上記湾曲状の角部１０３での厚みｔ３は、プレス成形により材料が引き延ばされることで薄肉に形成される（ｔ３＜ｔ１，ｔ２）。そのため、この薄肉の湾曲部が上記極めて小さな亀裂のきっかけとなってしまうのである。 This point will be described in detail. In the conventional stopper fitting, the corner portion 103 between the stopper plate portion 101 and the tubular portion 102 is formed as a curved portion that curves in a single arc shape in the axial cross section. (See FIG. 14). Since this stopper metal fitting is generally formed by press molding, the thickness t3 at the curved corner 103 is less than the thickness t1 and t2 at the stopper plate portion 101 and the cylindrical portion 102 by the press molding. Is stretched to form a thin wall (t3 <t1, t2). For this reason, the thin curved portion is a trigger for the extremely small crack.

かかる極めて小さな亀裂を防止するための方策として、例えば、ストッパ金具の板厚を厚くしたり、ストッパ金具の材質を変更することが考えられるが、その場合、重量アップやコストアップにつながる。また、上記湾曲部の曲率半径を大きくする方策もあるが、その効果は不十分であり、更なる耐久性の向上が求められる。 As measures for preventing such extremely small cracks, for example, it is conceivable to increase the thickness of the stopper fitting or change the material of the stopper fitting, but this leads to an increase in weight and cost. There is also a measure to increase the radius of curvature of the curved portion, but the effect is insufficient and further improvement in durability is required.

本発明は、以上に鑑みてなされたものであり、ストッパ金具の角部における上記極めて小さな亀裂発生を抑制して耐久性に優れる防振装置を提供することを目的とする。 The present invention has been made in view of the above, and an object thereof is to provide a vibration isolator having excellent durability by suppressing the occurrence of the extremely small cracks at the corners of the stopper fitting.

本発明に係る防振装置は、筒状胴部を有する本体金具と、上側取付金具と、前記本体金具と上側取付金具との間に介設されて両金具を結合するゴム弾性体からなる防振基体と、前記本体金具の上端開口部に取り付けられて前記上側取付金具の上下方向の変位に対するストッパ作用を果たすストッパ金具とを備えた防振装置において、前記ストッパ金具が、前記防振基体の周りを取り囲む筒状部と、該筒状部の上端から角部を介して内向きに延びて前記上側取付金具に対するストッパ用の当接部を構成するストッパ板部とを備えてなり、前記角部が、前記筒状部から前記ストッパ板部に向けて円弧状に湾曲する第１湾曲部と、前記ストッパ板部から前記筒状部に向けて円弧状に湾曲する第２湾曲部と、前記第１湾曲部と第２湾曲部を連結するストレート状の傾斜部とで構成されたものである。 An anti-vibration device according to the present invention includes a body fitting having a cylindrical body, an upper mounting bracket, and a rubber elastic body that is interposed between the body bracket and the upper mounting bracket and joins both brackets. An anti-vibration device comprising a vibration base and a stopper fitting attached to the upper end opening of the main body fitting and acting as a stopper against the vertical displacement of the upper attachment fitting, wherein the stopper fitting is provided on the anti-vibration base. A cylindrical portion that surrounds the periphery, and a stopper plate portion that extends inwardly from the upper end of the cylindrical portion via a corner portion and constitutes a stopper contact portion for the upper mounting bracket. A first curved portion that curves in an arc from the cylindrical portion toward the stopper plate portion, a second curved portion that curves in an arc from the stopper plate portion toward the cylindrical portion, and A bridge connecting the first bending portion and the second bending portion. Those comprised of a rate-shaped inclined portion.

このようにストッパ金具の角部を、単なる湾曲状ではなく、ストレート状の傾斜部とその両側の第１湾曲部及び第２湾曲部とで構成したので、極めて小さな亀裂のきっかけとなる湾曲部が２つに分散され、そのためかかる極めて小さな亀裂の発生を抑えることができる。従って、ストッパ金具がアルミニウムのプレス成形品であっても、耐久性を向上することができる。 In this way, the corners of the stopper fitting are not simply curved, but are composed of straight inclined parts and the first and second curved parts on both sides thereof, so that the curved parts that trigger very small cracks are formed. Therefore, the occurrence of such extremely small cracks can be suppressed. Therefore, even if the stopper fitting is an aluminum press-formed product, the durability can be improved.

前記ストッパ金具の厚みは、前記筒状部における厚みをＴ１、前記第１湾曲部における厚みをＴ２、前記傾斜部における厚みをＴ３、前記第２湾曲部における厚みをＴ４、前記ストッパ板部における厚みをＴ５として、Ｔ１＞Ｔ２＞Ｔ３およびＴ３＜Ｔ４＜Ｔ５を満足していることが好ましい。この場合、傾斜部は薄肉であるもののストレート状であるため上記極めて小さな亀裂のきっかけになりにくく、一方、極めて小さな亀裂のきっかけとなりやすい第１及び第２湾曲部は、傾斜部よりも厚くなっているので、結果として耐久性を更に向上することができる。 As for the thickness of the stopper fitting, the thickness at the cylindrical portion is T1, the thickness at the first curved portion is T2, the thickness at the inclined portion is T3, the thickness at the second curved portion is T4, and the thickness at the stopper plate portion. Is preferably T5, T1> T2> T3 and T3 <T4 <T5 are preferably satisfied. In this case, since the inclined portion is thin but straight, it is difficult to cause the above-mentioned very small crack. On the other hand, the first and second curved portions that are likely to cause the extremely small crack are thicker than the inclined portion. As a result, durability can be further improved.

かかる角部での板厚分布は、次のようにして形成することができる。すなわち、一実施形態として、前記筒状部と前記ストッパ板部との間の前記角部を、軸方向断面において円弧状の湾曲部に形成した後、該湾曲部に対して外側からプレス型のストレート状の傾斜面を押し当てることで、前記ストレート状の傾斜部と該傾斜部の両側の前記第１湾曲部及び第２湾曲部に形成してもよい。このように、一旦円弧状の湾曲部を形成した後、ストレート状の傾斜部を加えることにより、該傾斜部は元の湾曲部と同等の薄肉になるが、その両側の第１及び第２湾曲部は元の湾曲部よりも厚くなる。そして、傾斜部は薄肉であるもののストレート状であるため上記極めて小さな亀裂のきっかけになりにくく、一方、極めて小さな亀裂のきっかけとなりやすい第１及び第２湾曲部は、元の湾曲部よりも厚くなっているので、結果として耐久性を一層向上することができる。 The plate thickness distribution at such corners can be formed as follows. That is, as one embodiment, after the corner portion between the cylindrical portion and the stopper plate portion is formed into an arc-shaped curved portion in the axial cross section, a press mold is applied to the curved portion from the outside. You may form in the said 1st curved part and the 2nd curved part of the both sides of the said straight inclined part by pressing a straight inclined surface. In this way, once the arc-shaped curved portion is formed and then the straight-shaped inclined portion is added, the inclined portion becomes thin as the original curved portion, but the first and second curved portions on both sides thereof. The part is thicker than the original curved part. In addition, since the inclined portion is thin but straight, it is difficult to cause the above-mentioned very small crack. On the other hand, the first and second curved portions that are likely to cause the extremely small crack are thicker than the original curved portion. As a result, durability can be further improved.

本発明の防振装置においては、前記防振基体との間に液室を形成するダイヤフラムが前記防振基体に対向して配され、前記本体金具が、筒状金具と、該筒状金具の下端開口部で前記ダイヤフラムとともにかしめ締結されて前記ダイヤフラムとの間に空気室を形成する椀状の底金具とからなり、前記底金具がアルミニウムのダイカスト成形品であって、該底金具の底壁部が軸方向に対して傾斜して設けられるとともに、該底壁部の下面に位置決め用の凸部が突設されて、該凸部の側面における周方向の一部がダイカスト成形型の抜き方向に沿って切り取られた形状に形成されてもよい。このように底金具の底壁部が軸方向に対して傾斜している場合、ダイカスト成形後の脱型時に、底壁部の下面に突設された位置決め用の凸部がアンダーカット形状となって抜けにくくなる。そこで、該凸部の側面における一部を該成形型の抜き方向に沿って切り取られた形状とすることで、脱型時の上記不具合を解消することができる。 In the vibration isolator of the present invention, a diaphragm that forms a liquid chamber between the vibration isolating base and the vibration isolating base is disposed opposite to the vibration isolating base, the main body metal fitting includes a cylindrical metal fitting, and the cylindrical metal fitting. A bottom metal fitting that is caulked and fastened together with the diaphragm at a lower end opening to form an air chamber between the diaphragm, and the bottom metal fitting is an aluminum die-cast product, and the bottom wall of the bottom metal fitting And a convex portion for positioning is provided on the lower surface of the bottom wall portion, and a part of the circumferential direction on the side surface of the convex portion is a die-casting die drawing direction. It may be formed in a shape cut along. Thus, when the bottom wall portion of the bottom metal part is inclined with respect to the axial direction, the positioning convex portion projecting from the bottom surface of the bottom wall portion has an undercut shape when demolding after die casting. It becomes difficult to come off. Then, the said malfunction at the time of demolding can be eliminated by making a part in the side surface of this convex part into the shape cut off along the extraction direction of this shaping | molding die.

本発明の防振装置において、前記ストッパ金具の前記筒状部に水抜き用の貫通孔が設けられていると、ストッパ金具の内側に侵入した水を排出することができる。 In the vibration isolator of the present invention, when a through hole for draining is provided in the cylindrical portion of the stopper fitting, water that has entered the stopper fitting can be discharged.

本発明の防振装置においては、前記本体金具の上端開口部に外向きのフランジ部が設けられ、前記ストッパ金具の前記筒状部の下端部に該フランジ部の上面に当接する当接面部を介して該フランジ部を包み込むようにかしめ締結するためのかしめ筒部が張出し形成され、該かしめ筒部の周方向の一部に下方に向けて凹状に切り欠かれたかしめ筒部側切欠部が設けられるとともに、前記フランジ部の周方向の一部に外方に向けて凹状に切り欠かれたフランジ部側切欠部が設けられ、両切欠部を周方向で位置合わせしてかしめ締結することで、かしめ締結部に下方に開口する水抜き用開口部が設けられてもよい。これにより、ストッパ金具の内側に侵入した水をかしめ締結部の周方向における一部から下方に排出することができる。 In the vibration isolator of the present invention, an outward flange portion is provided at the upper end opening of the main body bracket, and a contact surface portion that contacts the upper surface of the flange portion is provided at the lower end portion of the cylindrical portion of the stopper bracket. A caulking cylinder part for caulking and fastening so as to wrap the flange part through the caulking cylinder part, and a caulking cylinder part side notch part that is notched downwardly in a part of the circumferential direction of the caulking cylinder part. The flange part side notch part notched concavely toward the outside is provided in a part in the circumferential direction of the flange part, and both the notch parts are aligned in the circumferential direction and caulked and fastened. The draining opening that opens downward may be provided in the caulking fastening portion. Thereby, the water which penetrate | invaded the inner side of the stopper metal fitting can be discharged | emitted below from the part in the circumferential direction of a caulking fastening part.

また、この場合、前記筒状部の周方向の一部に、前記水抜き用開口部に水を導くガイド部が張出し形成されていると、該水抜き用開口部からスムーズに水を排出することができる。 Further, in this case, if a guide portion for guiding water to the drain opening is formed over a part of the cylindrical portion in the circumferential direction, water is smoothly discharged from the drain opening. be able to.

本発明によれば、ストッパ金具がアルミニウム製であっても、その角部における極めて小さな亀裂の発生を抑制することができ、耐久性に優れた防振装置を提供することができる。 According to the present invention, even if the stopper fitting is made of aluminum, it is possible to suppress the occurrence of extremely small cracks at the corners, and to provide a vibration isolator having excellent durability.

以下、本発明の実施の形態を図面に基づいて説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

図１は第１実施形態に係る防振装置１０の縦断面図、図２は同防振装置１０の側面図である。この防振装置１０は、自動車のエンジンを車体に対して支承するエンジンマウントであり、車体側のメンバ９に取付けられる筒状胴部を有する本体金具１２と、エンジン側のブラケット等の部材８に取付けられる上側取付金具１４と、これら本体金具１２と上側取付金具１４との間にあってエンジンからの振動を吸収及び遮断するゴム弾性体からなる防振基体１６と、防振基体１６と軸方向に間隔をおいて対向するゴム膜からなるダイヤフラム１８と、防振基体１６とダイヤフラム１８との間において防振基体１６にてその室壁の一部が形成されるものであって液体が封入される主液室２０と、該主液室２０に第１オリフィス２２を介して連通せしめられて主液室２０と同様に液体が封入されるとともにダイヤフラム１８にて室壁の一部が区画形成される副液室２４と、前記主液室２０と副液室２４との間を仕切る仕切部材２６と、該仕切部材２６内にあって主液室２０に対して弾性仕切り膜２８にて室壁の一部が区画形成される第３液室３０と、第３液室３０と副液室２４との間を連通させる第２オリフィス３２とを備える液体封入式防振装置である。そして、かかる２つのオリフィス２２，３２による液流動効果や防振基体１６の制振効果により、振動減衰効果と振動絶縁効果を果たすように構成されている。 FIG. 1 is a longitudinal sectional view of a vibration isolator 10 according to the first embodiment, and FIG. 2 is a side view of the vibration isolator 10. The vibration isolator 10 is an engine mount that supports an automobile engine with respect to a vehicle body. The vibration isolator 10 is attached to a body bracket 12 having a cylindrical body portion that is attached to a vehicle body side member 9 and a member 8 such as an engine side bracket. An upper mounting bracket 14 to be mounted, a vibration isolating base 16 made of a rubber elastic body that absorbs and blocks vibrations from the engine between the main body mounting bracket 12 and the upper mounting bracket 14, and is spaced apart from the vibration isolating base 16 in the axial direction. A part of the chamber wall is formed by the vibration isolating substrate 16 between the diaphragm 18 made of a rubber film facing each other and the vibration isolating substrate 16 and the diaphragm 18, and a liquid is enclosed therein. The liquid chamber 20 is communicated with the main liquid chamber 20 via the first orifice 22 so that the liquid is sealed in the same manner as the main liquid chamber 20 and a part of the chamber wall is separated by the diaphragm 18. The sub liquid chamber 24 to be formed, the partition member 26 that partitions the main liquid chamber 20 and the sub liquid chamber 24, and the partition wall 26 that is in the partition member 26 with an elastic partition film 28 for the main liquid chamber 20 This is a liquid-filled vibration damping device including a third liquid chamber 30 in which a part of the chamber wall is partitioned and a second orifice 32 that allows communication between the third liquid chamber 30 and the auxiliary liquid chamber 24. The vibration damping effect and the vibration insulation effect are achieved by the liquid flow effect by the two orifices 22 and 32 and the vibration suppression effect of the vibration isolation base 16.

本体金具１２は、上記筒状胴部を構成する筒状金具３４と、その下端開口部３４Ａにおいてダイヤフラム１８及び仕切部材２６とともにかしめ固定される椀状の底金具３６とからなり、底金具３６とダイヤフラム１８との間に空気室３８が形成されている。 The main body metal fitting 12 includes a cylindrical metal fitting 34 constituting the above-described cylindrical body portion, and a bowl-shaped bottom metal fitting 36 that is caulked and fixed together with the diaphragm 18 and the partition member 26 at the lower end opening 34A. An air chamber 38 is formed between the diaphragm 18 and the diaphragm 18.

上側取付金具１４は、本体金具１２の軸心部上方に配されたボス状金具であり、径方向外方に向かって全周にわたって突出するストッパ用フランジ４０を備え、加硫成形手段により防振基体１６の上部に埋設されている。ストッパ用フランジ４０は防振基体１６から連なったゴムよりなるストッパゴム４２にて包被されている。 The upper mounting bracket 14 is a boss-shaped bracket disposed above the axial center portion of the main body bracket 12 and includes a stopper flange 40 that protrudes over the entire circumference in the radially outward direction. It is embedded in the upper part of the base 16. The stopper flange 40 is covered with a stopper rubber 42 made of rubber continuous from the vibration isolation base 16.

防振基体１６は、略傘形状をなし、その下端部が本体金具１２の上端開口部１２Ａに加硫接着手段により取着されている。詳細には、該上端開口部１２Ａは、テーパー部１２Ａ１を介して外向き（即ち、軸直角方向外方）にフランジ状に拡開されたフランジ部１２Ａ２を備え、該テーパー部１２Ａ１に防振基体１６の下端部が取着されている。 The anti-vibration base 16 has a substantially umbrella shape, and its lower end is attached to the upper end opening 12A of the main body 12 by vulcanization adhesive means. Specifically, the upper end opening portion 12A includes a flange portion 12A2 that is widened outwardly (that is, outward in the direction perpendicular to the axis) in a flange shape through the taper portion 12A1, and the vibration-proof base is provided in the taper portion 12A1. The lower end of 16 is attached.

符号４４は、本体金具１２の上端開口部１２Ａに取り付けられて、上側取付金具１４の上下方向Ｚの変位に対するストッパ作用を果たすように設けられたストッパ金具である。このストッパ金具４４は、アルミニウムのプレス成形品であって、防振基体１６の周りを取り囲む筒状部４６と、その上端から角部４８を介して内向き（即ち、軸直角方向内方）に延びてストッパ用フランジ部４０に対するストッパ用の当接部を構成するストッパ板部５０とを備えてなる。 Reference numeral 44 denotes a stopper fitting that is attached to the upper end opening 12A of the body fitting 12 and that serves as a stopper for the displacement of the upper attachment fitting 14 in the vertical direction Z. The stopper metal 44 is an aluminum press-molded product, and is inward (that is, inward in the direction perpendicular to the axis) from the upper end of the cylindrical portion 46 surrounding the antivibration base 16 and the corner 48. A stopper plate portion 50 that extends to form a stopper contact portion with the stopper flange portion 40 is provided.

ストッパ金具４４は、筒状部４６の下端部に、本体金具１２のフランジ部１２Ａ２を包み込むようにかしめ締結するための大径のかしめ筒部５２を備える（図４参照）。かしめ筒部５２は、上記フランジ部１２Ａ２の上面に当接する当接面部５４を介して、筒状部４６の下端に張出し形成されている。当接面部５４は、筒状部４６の下端から外向きのフランジ状に折曲形成され、該当接面部５４の外周縁から下方に向けてかしめ筒部５２が折曲形成されている。 The stopper fitting 44 includes a large-diameter caulking cylinder portion 52 for caulking and fastening to the lower end portion of the cylindrical portion 46 so as to wrap the flange portion 12A2 of the main body fitting 12 (see FIG. 4). The caulking tube portion 52 is formed to project from the lower end of the tubular portion 46 via a contact surface portion 54 that contacts the upper surface of the flange portion 12A2. The contact surface portion 54 is bent into an outward flange shape from the lower end of the tubular portion 46, and the caulking tube portion 52 is bent downward from the outer peripheral edge of the contact surface portion 54.

図３に示されるように、ストッパ金具４４は、軸方向（軸Ａに沿った方向）から見て長円形状をなしており、従って、上記の本体金具１２、ダイヤフラム１８及び仕切部材２６も長円形状をなしている。ここで長円形状には、楕円形だけでなく、競技トラックのような２つの半円とこれらをなめらかに結ぶ２本の直線とからなる形状も含まれる。 As shown in FIG. 3, the stopper fitting 44 has an oval shape when viewed from the axial direction (the direction along the axis A). Therefore, the main body fitting 12, the diaphragm 18 and the partition member 26 are also long. It has a circular shape. Here, the oval shape includes not only an oval shape but also a shape composed of two semicircles such as a competition track and two straight lines that smoothly connect them.

図４に示すように、ストッパ金具４４の筒状部４６とストッパ板部５０とを接続する角部４８は、筒状部４６の上端からストッパ板部５０に向けて内側に円弧状に湾曲する第１湾曲部５６と、ストッパ板部５０の外周端から筒状部４６に向けて下方に円弧状に湾曲する第２湾曲部５８と、これらの湾曲部５６，５８を連結する平坦なストレート状の傾斜部６０とで構成されている。この実施形態では、軸方向断面（図４に示す軸Ａを含む平面で切断した面）において、傾斜部６０は軸Ａに対して４５°に傾斜した姿勢に形成され（この傾斜角度は３０°〜６０°の範囲内が好適である。）、また、第１湾曲部５６と第２湾曲部５８は、同一の曲率半径を持つ円弧状に形成されている。そして、かかる形状の角部４８は、ストッパ金具４４の全周にわたって形成されている。 As shown in FIG. 4, the corner portion 48 connecting the cylindrical portion 46 and the stopper plate portion 50 of the stopper fitting 44 is curved in an arc shape inward from the upper end of the cylindrical portion 46 toward the stopper plate portion 50. A first curved portion 56, a second curved portion 58 that curves downward in an arc from the outer peripheral end of the stopper plate portion 50 toward the tubular portion 46, and a flat straight shape that connects these curved portions 56, 58. And an inclined portion 60. In this embodiment, the inclined portion 60 is formed in a posture inclined at 45 ° with respect to the axis A in an axial cross section (a plane cut along a plane including the axis A shown in FIG. 4) (this inclination angle is 30 °). The first bending portion 56 and the second bending portion 58 are formed in an arc shape having the same radius of curvature. The corner 48 having such a shape is formed over the entire circumference of the stopper fitting 44.

本実施形態では、上記形状の角部４８を持つストッパ金具４４は次のようにして作製される。すなわち、まず、所定形状のアルミニウム製板材をプレス成形することで、図６（ａ）に示すように、角部４８が軸方向断面において単一の円弧状の湾曲部６２となるように折曲形成する。このとき、湾曲部６２での厚みＴ１０は、筒状部４６やストッパ板部５０の厚みＴ１１，Ｔ１２に対して、薄くなっている。次いで、該湾曲部６２に対して外側からプレス型のストレート状の傾斜面７を押し当てる。これにより、該傾斜面７に対応してストレート状の傾斜部６０が形成されるので、傾斜部６０とその両側に第１湾曲部５６と第２湾曲部５８を備える上記角部４８が形成される（図６（ｂ）参照）。 In the present embodiment, the stopper fitting 44 having the corner portion 48 having the above shape is manufactured as follows. That is, first, an aluminum plate material having a predetermined shape is press-molded, and as shown in FIG. 6A, the corner portion 48 is bent so as to become a single arc-shaped curved portion 62 in the axial cross section. Form. At this time, the thickness T10 at the curved portion 62 is thinner than the thicknesses T11 and T12 of the cylindrical portion 46 and the stopper plate portion 50. Next, a press-type straight inclined surface 7 is pressed against the curved portion 62 from the outside. Thereby, since the straight inclined portion 60 is formed corresponding to the inclined surface 7, the corner portion 48 including the inclined portion 60 and the first bending portion 56 and the second bending portion 58 on both sides thereof is formed. (See FIG. 6B).

このようにして作製すると、傾斜部６０を形成するときに、該傾斜部６０は元の湾曲部６２と同等の薄肉になるものの、その両側の第１及び第２湾曲部５６，５８は元の湾曲部６２よりも厚くなる。そのため、筒状部４６での厚みをＴ１、第１湾曲部５６での厚みをＴ２、傾斜部６０での厚みをＴ３、第２湾曲部５８での厚みをＴ４、ストッパ板部５０での厚みをＴ５として、ストッパ金具４４の板厚分布は、
Ｔ１＞Ｔ２＞Ｔ３ …（１）
Ｔ３＜Ｔ４＜Ｔ５ …（２）
を満足することになる（図５参照）。すなわち、筒状部４６から第１湾曲部５６で板厚が薄く、傾斜部６０で更に薄くなってから、第２湾曲部５８で板厚が厚くなり、ストッパ板部５０で更に厚くなるように形成されている。 In this way, when the inclined portion 60 is formed, the inclined portion 60 becomes as thin as the original curved portion 62, but the first and second curved portions 56, 58 on both sides thereof are the original. It becomes thicker than the curved portion 62. Therefore, the thickness at the cylindrical portion 46 is T1, the thickness at the first curved portion 56 is T2, the thickness at the inclined portion 60 is T3, the thickness at the second curved portion 58 is T4, and the thickness at the stopper plate portion 50. Is T5, and the thickness distribution of the stopper fitting 44 is
T1>T2> T3 (1)
T3 <T4 <T5 (2)
(See FIG. 5). That is, the plate thickness from the cylindrical portion 46 to the first curved portion 56 is thin, the inclined portion 60 is further thinned, the second curved portion 58 is thick, and the stopper plate portion 50 is further thickened. Is formed.

図１，２に示すように、ストッパ金具４４の筒状部４６には、水抜き用の貫通孔６４が設けられている。貫通孔６４は、長円形状をなす筒状部４６の直線状部分４６Ａ（図３参照）における相対する２箇所に小孔状に設けられている。 As shown in FIGS. 1 and 2, the cylindrical portion 46 of the stopper fitting 44 is provided with a through hole 64 for draining water. The through holes 64 are provided in small holes at two opposing locations in the linear portion 46A (see FIG. 3) of the cylindrical portion 46 having an oval shape.

以上よりなるストッパ金具４４は、そのストッパ板部５０がストッパ用フランジ４０とその上方の車体側の部材８との間に挿入配置されることで、上側取付金具１４の上下方向の大変位を規制するストッパとして作用する。また、ストッパ金具４４は、ストッパ用フランジ４０の外方を全周にわたって取り囲むことで、上側取付金具１４の水平方向における大変位を規制するストッパとしても作用する。なお、ストッパ板部５０上面の車体側の部材８との当接面にはストッパゴム部６６が覆設されている。また、図１は、エンジン荷重が負荷されていない未荷重の状態が示されており、荷重が負荷されることでストッパ板部５０の上下に所定の隙間が確保される。 The stopper bracket 44 having the above-described configuration is such that the stopper plate portion 50 is inserted and disposed between the stopper flange 40 and the vehicle body-side member 8 above the stopper bracket 40, thereby restricting large displacement in the vertical direction of the upper mounting bracket 14. Acts as a stopper. The stopper fitting 44 also acts as a stopper for restricting large displacement in the horizontal direction of the upper mounting fitting 14 by surrounding the outer side of the stopper flange 40 over the entire circumference. A stopper rubber portion 66 is covered on the contact surface of the upper surface of the stopper plate portion 50 with the member 8 on the vehicle body side. Moreover, FIG. 1 shows an unloaded state in which no engine load is applied, and a predetermined gap is secured above and below the stopper plate portion 50 when the load is applied.

本実施形態の防振装置１０であると、ストッパ金具４４の角部４８を、単なる湾曲状ではなく、ストレート状の傾斜部６０とその両側の湾曲部５６，５８との複合構造としたので、極めて小さな亀裂のきっかけとなる湾曲部を２つに分散することができる。また、上記（１）及び（２）の板厚分布により、傾斜部６０は元の湾曲部６２と同等の薄肉であるもののストレート状であるため極めて小さな亀裂のきっかけになりにくく、一方、極めて小さな亀裂のきっかけとなりやすい第１及び第２湾曲部５６，５８は、元の湾曲部６２よりも厚くなっている。そのため、角部４８での極めて小さな亀裂の発生を抑えて、耐久性を飛躍的に向上することができる。特に、ストッパ金具４４が長円形状の場合、真円状の場合に比べて、直線状部分で強度に劣ることから、上記角部４８の構成は、かかる長円形状のストッパ金具４４の場合により有効である。また、ストッパ金具４４全体の板厚を厚くしたり、材質変更を伴うものではないので、重量アップやコストアップを伴うことなく、耐久性を向上することができる。 In the vibration isolator 10 of the present embodiment, the corner portion 48 of the stopper fitting 44 is not a simple curved shape, but has a combined structure of a straight inclined portion 60 and curved portions 56 and 58 on both sides thereof. It is possible to disperse the curved portion that triggers an extremely small crack into two. In addition, due to the plate thickness distribution of (1) and (2) above, the inclined portion 60 is as thin as the original curved portion 62 but is straight, so it is difficult to trigger very small cracks. The first and second curved portions 56 and 58 that are likely to cause a crack are thicker than the original curved portion 62. Therefore, the occurrence of extremely small cracks at the corner portion 48 can be suppressed and the durability can be dramatically improved. In particular, when the stopper fitting 44 is in the shape of an ellipse, the strength of the straight portion is inferior to that in the case of a perfect circle. Therefore, the configuration of the corner portion 48 depends on the case of the oval stopper fitting 44. It is valid. Further, since the thickness of the stopper metal fitting 44 as a whole is not increased and the material is not changed, the durability can be improved without increasing the weight and cost.

本実施形態に係る図４に示す形状のストッパ金具４４と、比較例として図１４に示す形状を持つストッパ金具とについて（角部の形状以外は全く同じもの）、それぞれ図１に示すように防振装置に組付け、車両搭載時を想定した荷重を上下方向に所定振動数で加えて、耐久性試験を行ったところ、比較例の防振装置では、所定振動回数にて、角部（詳細には、長円形状の直線状部分に相当する箇所）に極めて小さな亀裂が発生したのに対し、実施形態の防振装置では、上記所定振動回数では極めて小さな亀裂は発生しておらず、その２倍の振動回数まで極めて小さな亀裂の発生を遅らせることができた。 4 according to the present embodiment and a stopper metal fitting having the shape shown in FIG. 14 as a comparative example (exactly the same except for the shape of the corner), respectively, as shown in FIG. When a durability test was conducted by attaching a load assumed to be mounted on a vibration device at a predetermined frequency in the vertical direction, and the durability test was conducted, the corner portion (details) In contrast, in the vibration isolator of the embodiment, no very small crack was generated at the predetermined number of vibrations, whereas the portion corresponding to the oval linear portion was not generated. The generation of extremely small cracks could be delayed up to twice the number of vibrations.

図７は第２実施形態に係る防振装置１０Ａの縦断面図、図８は同防振装置１０Ａの側面図である。この防振装置１０Ａは、第１実施形態の防振装置１０と基本構成は共通しており、ストッパ金具４４の水抜き手段と下側取付金具としての底金具３６の構成に特徴がある。なお、同じ符号を付した部分は特に説明しない限り同一の構成を有するものとして説明は省略する。 FIG. 7 is a longitudinal sectional view of the vibration isolator 10A according to the second embodiment, and FIG. 8 is a side view of the vibration isolator 10A. This anti-vibration device 10A has the same basic configuration as the anti-vibration device 10 of the first embodiment, and is characterized by the structure of the drain fitting means of the stopper fitting 44 and the bottom fitting 36 as the lower mounting fitting. In addition, the part which attached | subjected the same code | symbol is abbreviate | omitted description as what has the same structure unless it demonstrates especially.

防振装置１０Ａのストッパ金具４４では、筒状部４６には水抜き用の貫通孔６４は設けられておらず、その代わりに水抜き手段が次のように設けられている。 In the stopper fitting 44 of the vibration isolator 10A, the cylindrical portion 46 is not provided with a through hole 64 for draining water, but instead, draining means is provided as follows.

図９に示すように、ストッパ金具４４のかしめ筒部５２には、その周方向Ｂ（図１０参照）の一箇所に下方に向けて凹状に切り欠かれたかしめ筒部側切欠部６８が設けられている。この切欠部６８の高さはかしめ筒部５２内で終端し、当接面部５４までには達しないように設定されている。 As shown in FIG. 9, the caulking tube portion 52 of the stopper fitting 44 is provided with a caulking tube portion-side notch portion 68 that is notched in a concave shape at one location in the circumferential direction B (see FIG. 10). It has been. The height of the notch 68 is set so as to terminate in the caulking tube portion 52 and not reach the contact surface portion 54.

また、図７，１０に示すように、本体金具１２のフランジ部１２Ａ２には、その周方向Ｂの一箇所に軸直角方向外方に向けて凹状に切り欠かれたフランジ部側切欠部７０が設けられている。 As shown in FIGS. 7 and 10, the flange portion 12 </ b> A <b> 2 of the metal shell 12 has a flange-side notch portion 70, which is notched in a concave shape outward in the direction perpendicular to the axis at one location in the circumferential direction B. Is provided.

そして、ストッパ金具４４と本体金具１２は、互いの切欠部６８，７０を周方向Ｂで位置合わせしてかしめ締結されており、これにより、図７，１０に示すように、かしめ締結部７２に下方に開口する水抜き用開口部７４が設けられている。 The stopper fitting 44 and the body fitting 12 are caulked and fastened with their notches 68 and 70 aligned with each other in the circumferential direction B. As a result, as shown in FIGS. A drainage opening 74 that opens downward is provided.

また、ストッパ金具４４の筒状部４６には、かしめ筒部側切欠部６８に対応する周方向Ｂの一箇所に、上記水抜き用開口部７４に水を導くためのガイド部７６が張出し形成されている。ガイド部７６は、筒状部４６の下端部を、その周方向Ｂの一部において、下方かつ外方に傾斜した傾斜面状に張り出させることで形成されている。 In addition, a guide portion 76 for guiding water to the drainage opening 74 is formed on the tubular portion 46 of the stopper fitting 44 at one location in the circumferential direction B corresponding to the caulking tube portion side cutout portion 68. Has been. The guide portion 76 is formed by projecting the lower end portion of the cylindrical portion 46 in a part of the circumferential direction B into an inclined surface shape that is inclined downward and outward.

このようにして水抜き用開口部７４を設けたことにより、ストッパ金具４４の内側に侵入した水をかしめ締結部７２の周方向における一部から下方にスムーズに排出することができる。特に、防振装置１０Ａが車両に搭載される際に、かしめ締結部７２が傾斜して水抜き用開口部７４のある位置が最低位置になるような姿勢で車体側のメンバ９に組み付けられる場合には、この水抜き用開口部７４からより一層スムーズに排水することが可能となる。 By providing the drain opening 74 in this way, the water that has entered the inside of the stopper fitting 44 can be smoothly discharged downward from a part of the fastening portion 72 in the circumferential direction. In particular, when the vibration isolator 10A is mounted on the vehicle, the caulking fastening portion 72 is inclined and assembled to the vehicle body side member 9 in such a posture that the position where the drainage opening 74 is located is the lowest position. Therefore, it becomes possible to drain water more smoothly from the drain opening 74.

防振装置１０Ａでは、また、底金具３６が次のように構成されている。すなわち、底金具３６は、アルミニウムのダイカスト成形品からなり、その底壁部７８が軸方向に対して垂直な姿勢から傾斜して設けられている。そして、この底壁部７８には、下方に突出する取付ボルト８０が固設されるとともに、底壁部７８の下面に位置決め用の凸部８２が突設されている。 In the vibration isolator 10A, the bottom metal fitting 36 is configured as follows. That is, the bottom metal fitting 36 is made of an aluminum die-cast product, and the bottom wall portion 78 is inclined from a posture perpendicular to the axial direction. The bottom wall 78 is fixedly provided with a mounting bolt 80 projecting downward, and a positioning projection 82 projects from the bottom surface of the bottom wall 78.

取付ボルト８０は、底壁部７８に設けられた貫通孔８４に対し、頭部下方にセレーション部を有するボルトを圧入することで、底壁部７８の下面に垂直に設けられている。 The mounting bolt 80 is vertically provided on the lower surface of the bottom wall portion 78 by press-fitting a bolt having a serration portion below the head into a through hole 84 provided in the bottom wall portion 78.

位置決め用の凸部８２は、車体側のメンバ９の位置決め用穴９Ａに嵌り込む突起であり、図１２に拡大して示すように、先端に半球部を備える円柱状をなして、底壁部７８の下面から垂直に突出形成されている。 The positioning convex portion 82 is a projection that fits into the positioning hole 9A of the vehicle body side member 9, and as shown in an enlarged view in FIG. 12, has a cylindrical shape with a hemispherical portion at the tip, and a bottom wall portion. Projecting vertically from the lower surface of 78.

そして、図１１，１２に示されるように、この凸部８２の側面における周方向Ｃの一箇所がダイカスト成形型９０の抜き方向Ｄ（図１３参照）に沿って切り取られた形状に形成され、これにより、該側面の一部に傾斜面８８が設けられている。 Then, as shown in FIGS. 11 and 12, one part in the circumferential direction C on the side surface of the convex portion 82 is formed in a shape cut along the drawing direction D (see FIG. 13) of the die casting mold 90, Thus, an inclined surface 88 is provided on a part of the side surface.

詳細には、図１３に示すように、底金具３６は、固定型としての上型９２と、可動型としての下型９４とからなるダイカスト成形型９０により成形され、下型９４は、底金具３６の軸方向に沿った方向に移動して型抜きされる。すなわち、底金具３６の軸方向が抜き方向Ｄとなる。その際、軸方向に対して傾斜した底壁部７８に設けられた凸部８２が単なる円柱状であると、アンダーカット形状となって抜けにくい。そこで、アンダーカット形状とならないように、凸部８２の膨らみ部分が切り取られており、従って、切り取り面となる上記傾斜面８８は、抜き方向Ｄである軸方向に平行に形成されている。これにより、脱型時の不具合が解消される。 Specifically, as shown in FIG. 13, the bottom metal fitting 36 is formed by a die casting mold 90 including an upper mold 92 as a fixed mold and a lower mold 94 as a movable mold. The die is moved and moved in a direction along the axial direction of 36. That is, the axial direction of the bottom metal fitting 36 is the extraction direction D. In that case, if the convex part 82 provided in the bottom wall part 78 inclined with respect to the axial direction is a mere columnar shape, it becomes an undercut shape and is difficult to come off. Therefore, the bulging portion of the convex portion 82 is cut out so as not to have an undercut shape. Therefore, the inclined surface 88 serving as a cut-out surface is formed in parallel to the axial direction that is the drawing direction D. Thereby, the trouble at the time of mold removal is eliminated.

なお、底壁部７８の貫通孔８４は、図１３に示すように、ダイカスト成形時にアンダーカット形状とならないように、凹部９６として形成され、ダイカスト成形後に、この凹部９６を目印として貫通孔８４が穿設される。 As shown in FIG. 13, the through hole 84 in the bottom wall portion 78 is formed as a recess 96 so as not to have an undercut shape during die casting, and after the die casting, the through hole 84 is formed with the recess 96 as a mark. Drilled.

また、凸部８２の付け根部には全周にわたって溝８６が設けられている。凸部８２の付け根部には、ダイカスト成型により、底壁部７８の下面との間で微小な曲面が形成されることが避けられない。そのため、溝８６がない場合、メンバ９側の穴９Ａの周縁部が上記曲面に乗り上げてしまう不具合が生じるが、上記溝８６を設けたことでかかる不具合を解消することができる。 Further, a groove 86 is provided at the base of the convex portion 82 over the entire circumference. It is inevitable that a minute curved surface is formed between the bottom surface of the bottom wall portion 78 at the base portion of the convex portion 82 by die casting. For this reason, when there is no groove 86, there is a problem that the peripheral portion of the hole 9 </ b> A on the member 9 side rides on the curved surface. However, the provision of the groove 86 can eliminate such a problem.

なお、以上の実施形態においては、２つのオリフィスを持つダブルオリフィスの防振装置を例に挙げて説明したが、本発明はシングルオリフィスの防振装置にも同様に適用できるものである。また、液封入式防振装置だけでなく、液室を持たない防振装置にも同様に適用することができる。 In the above embodiment, the double-orifice vibration isolator having two orifices has been described as an example. However, the present invention can be similarly applied to a single-orifice vibration isolator. Further, the present invention can be similarly applied not only to a liquid-filled vibration isolator but also to a vibration isolator having no liquid chamber.

第１実施形態に係る防振装置の縦断面図である。It is a longitudinal cross-sectional view of the vibration isolator which concerns on 1st Embodiment. 同防振装置の側面図である。It is a side view of the vibration isolator. 同防振装置のストッパ金具の平面図である。It is a top view of the stopper metal fitting of the vibration isolator. 同ストッパ金具の断面図（図３のIV−IV線断面）である。It is sectional drawing (IV-IV line cross section of FIG. 3) of the stopper metal fitting. 同ストッパ金具の角部の拡大断面図である。It is an expanded sectional view of the corner | angular part of the stopper metal fitting. 同ストッパ金具の成形工程を示す断面図であり、（ａ）は傾斜部形成前、（ｂ）は形成後の図である。It is sectional drawing which shows the formation process of the stopper metal fitting, (a) is a figure before formation of an inclined part, (b) is a figure after formation. 第２実施形態に係る防振装置の縦断面図である。It is a longitudinal cross-sectional view of the vibration isolator which concerns on 2nd Embodiment. 同防振装置の側面図である。It is a side view of the vibration isolator. 同防振装置のストッパ金具の側面図である。It is a side view of the stopper metal fitting of the vibration isolator. 図８のＸ方向視図である。It is a X direction view of FIG. 同防振装置の底金具の底面図である。It is a bottom view of the bottom metal fitting of the vibration isolator. 同底金具の位置決め用凸部の断面図である。It is sectional drawing of the convex part for positioning of the bottom metal fitting. 同底金具のダイカスト成形時の断面図である。It is sectional drawing at the time of the die-cast shaping | molding of the bottom metal fitting. 比較例に係るストッパ金具の断面図である。It is sectional drawing of the stopper metal fitting which concerns on a comparative example.

Explanation of symbols

１０，１０Ａ…防振装置、１２…本体金具、１２Ａ…上端開口部、１２Ａ２…フランジ部、１４…上側取付金具、１６…防振基体、１８…ダイヤフラム、３４…筒状金具（筒状胴部）、３４Ａ…下端開口部、３６…底金具、３８…空気室、４４…ストッパ金具、４６…筒状部、４８…角部、５０…ストッパ板部、５２…かしめ筒部、５４…当接面部、５６…第１湾曲部、５８…第２湾曲部、６０…傾斜部、６２…湾曲部、６４…貫通孔、６８…かしめ筒部側切欠部、７０…フランジ部側切欠部、７２…かしめ締結部、７４…水抜き用開口部、７６…ガイド部、７８…底壁部、８２…位置決め用の凸部、９０…ダイカスト成形型、７…プレス型のストレート状の傾斜面、Ａ…軸、Ｂ…周方向、Ｃ…凸部の周方向、Ｄ…抜き方向、Ｚ…上下方向
DESCRIPTION OF SYMBOLS 10,10A ... Vibration isolator, 12 ... Main body metal fitting, 12A ... Upper end opening part, 12A2 ... Flange part, 14 ... Upper mounting metal fitting, 16 ... Anti-vibration base | substrate, 18 ... Diaphragm, 34 ... Cylindrical metal fitting (cylindrical trunk | drum) 34A ... Lower end opening, 36 ... Bottom fitting, 38 ... Air chamber, 44 ... Stopper fitting, 46 ... Cylindrical portion, 48 ... Corner portion, 50 ... Stopper plate portion, 52 ... Caulking tube portion, 54 ... Abutting Surface part 56 ... First bending part 58 ... Second bending part 60 ... Inclined part 62 ... Bending part 64 ... Through hole 68 ... Caulking tube part side notch part 70 ... Flange part side notch part 72 ... Caulking fastening portion, 74 ... opening for draining, 76 ... guide portion, 78 ... bottom wall portion, 82 ... convex portion for positioning, 90 ... die casting mold, 7 ... straight inclined surface of press die, A ... Axis, B ... circumferential direction, C ... circumferential direction of convex part, D ... pulling direction, Z ... vertical direction

Claims

A body fitting having a cylindrical body, an upper mounting bracket, an anti-vibration base made of a rubber elastic body that is interposed between the body bracket and the upper mounting bracket, and joins both brackets; and an upper end of the body bracket In the vibration isolator provided with a stopper fitting attached to the opening and serving as a stopper for the vertical displacement of the upper attachment fitting,
The stopper bracket includes a cylindrical portion that surrounds the vibration-proof base, and a stopper that extends inward from the upper end of the cylindrical portion via a corner portion and constitutes a stopper contact portion for the upper mounting bracket With a plate part,
A first curved portion that is curved in an arc shape from the cylindrical portion toward the stopper plate portion; a second curved portion that is curved in an arc shape from the stopper plate portion toward the cylindrical portion; A vibration isolator comprising a straight inclined portion connecting the first bending portion and the second bending portion.

As for the thickness of the stopper fitting, the thickness at the cylindrical portion is T1, the thickness at the first curved portion is T2, the thickness at the inclined portion is T3, the thickness at the second curved portion is T4, and the thickness at the stopper plate portion. The vibration isolator according to claim 1, wherein T1> T2> T3 and T3 <T4 <T5 are satisfied.

The stopper fitting is an aluminum press-molded product, and the corner portion between the cylindrical portion and the stopper plate portion is formed into an arc-shaped curved portion in the axial cross section, and then the curved portion On the other hand, by pressing a straight inclined surface of a press die from the outside, the straight inclined portion and the first curved portion and the second curved portion on both sides of the inclined portion are formed. The vibration isolator according to claim 1 or 2.

A diaphragm that forms a liquid chamber between the anti-vibration base and the anti-vibration base is disposed,
The main body metal fitting is composed of a cylindrical metal fitting and a bowl-shaped bottom metal fitting that is caulked and fastened together with the diaphragm at a lower end opening of the cylindrical metal fitting to form an air chamber between the diaphragm,
The bottom metal fitting is an aluminum die-cast product, and the bottom wall portion of the bottom metal fitting is provided to be inclined with respect to the axial direction, and a positioning projection protrudes from the lower surface of the bottom wall portion. The vibration isolator according to claim 1, wherein a part of the side surface of the convex portion in the circumferential direction is formed in a shape cut out along a punching direction of the die casting mold.

The anti-vibration device according to claim 1, wherein a drainage through hole is provided in the cylindrical portion of the stopper fitting.

An outward flange portion is provided at the upper end opening of the main body bracket, and the flange portion is wrapped around the lower end portion of the cylindrical portion of the stopper bracket via a contact surface portion that contacts the upper surface of the flange portion. A caulking tube portion for caulking and fastening is formed in a protruding manner, and a caulking tube portion-side notch portion that is notched downwardly is provided in a part of the circumferential direction of the caulking tube portion, and the flange portion A flange-side notch that is concavely cut outward is provided in a part of the circumferential direction, and the two notches are aligned in the circumferential direction and fastened by caulking, so that the caulking fastening portion is lowered downward The anti-vibration device according to claim 1, further comprising an opening for draining water.

The vibration isolator according to claim 6, wherein a guide portion that guides water to the drainage opening is formed on a part of the cylindrical portion in the circumferential direction.