JP2015197199A

JP2015197199A - Vibration isolator

Info

Publication number: JP2015197199A
Application number: JP2014076711A
Authority: JP
Inventors: 現伊澤; Gen Izawa; 坂田　利文; Toshifumi Sakata; 利文坂田; 原田　誠; Makoto Harada; 誠原田; 石本　善隆; Yoshitaka Ishimoto; 善隆石本
Original assignee: Toyo Tire and Rubber Co Ltd
Current assignee: Toyo Tire Corp
Priority date: 2014-04-03
Filing date: 2014-04-03
Publication date: 2015-11-09
Anticipated expiration: 2034-04-03
Also published as: JP6297389B2

Abstract

PROBLEM TO BE SOLVED: To provide a vibration isolator capable of improving a degree of freedom in static characteristic design.SOLUTION: A first stopper portion 33 composed of a rubber elastic body is formed on a second member 20, and projected from the second member 20 toward the first member 10. The first stopper portion 33 is coated with a first coating portion 40 composed of a rubber elastic body, and restricts relative displacement by a prescribed amount or more, of the first member 10 and the second member 20 by interfering with a contact portion 31a formed on the first member 10. As a Young's modulus of the first stopper portion 33 is determined to be a value different from a Young's modulus of the first coating portion 40, static characteristics of the vibration isolator 1, at the time when the first coating portion 40 and the first stopper portion 33 receive loads, can be properly determined. Thus a degree of freedom in static characteristic design can be improved.

Description

本発明は防振装置に関し、静特性設計の自由度を向上できる防振装置に関するものである。 The present invention relates to a vibration isolator, and relates to a vibration isolator capable of improving the degree of freedom of static characteristic design.

自動車の振動源となるエンジンと支持体となる車体との間には、エンジンマウントとしての防振装置が配置される（例えば特許文献１）。特許文献１に開示される防振装置は、車体側に取り付けられる第１部材（内筒）と、エンジン側に取り付けられる第２部材（外筒）と、ゴム状弾性体から構成されると共に第１部材および第２部材とを連結する防振基体と、ゴム状弾性体から構成されると共に第１部材と第２部材との所定量以上の相対変位を規制するストッパ部とを備えている。ストッパ部が圧縮されることで剛性が次第に高められて、第１部材と第２部材との相対変位が規制される。この防振装置では、ストッパ部のヤング率を適宜設定することで、ストッパ部の圧縮が開始されてから相対変位が規制されるまでの静特性が設計される。 An anti-vibration device serving as an engine mount is disposed between an engine serving as a vibration source for an automobile and a vehicle body serving as a support (for example, Patent Document 1). The vibration isolator disclosed in Patent Document 1 includes a first member (inner cylinder) attached to the vehicle body side, a second member (outer cylinder) attached to the engine side, and a rubber-like elastic body. An anti-vibration base that connects the first member and the second member, and a stopper portion that is made of a rubber-like elastic body and restricts relative displacement of the first member and the second member by a predetermined amount or more are provided. By compressing the stopper portion, the rigidity is gradually increased, and the relative displacement between the first member and the second member is restricted. In this vibration isolator, by setting the Young's modulus of the stopper portion as appropriate, the static characteristics from the start of compression of the stopper portion until the relative displacement is regulated are designed.

特開２００８−１５１１７３号公報JP 2008-151173 A

しかしながら上述した従来の技術では、ストッパ部のヤング率を設定するだけでは、要求される静特性を満足できないことがあった。 However, in the conventional technique described above, the required static characteristics may not be satisfied only by setting the Young's modulus of the stopper portion.

本発明は上述した問題を解決するためになされたものであり、静特性設計の自由度を向上できる防振装置を提供することを目的としている。 The present invention has been made to solve the above-described problems, and an object thereof is to provide a vibration isolator capable of improving the degree of freedom in static characteristic design.

Means for Solving the Problems and Effects of the Invention

この目的を達成するために請求項１記載の防振装置によれば、支持体側または振動源側の一方に第１部材が取り付けられ、第１部材に対向する対向面を有する第２部材が支持体側または振動源側の他方に取り付けられる。ゴム状弾性体から構成される防振基体により第１部材および第２部材が連結される。 In order to achieve this object, according to the vibration isolator of claim 1, the first member is attached to one of the support side or the vibration source side, and the second member having an opposing surface facing the first member is supported. It is attached to the other of the body side or the vibration source side. The first member and the second member are connected by a vibration-proof base made of a rubber-like elastic body.

ゴム状弾性体から構成されるストッパ部が、第１部材または第２部材の一方に形成され、第１部材または第２部材の一方から第１部材または第２部材の他方へ向かって凸設される。ストッパ部は、ゴム状弾性体から構成される被覆部により被覆され、被覆部と共に、第１部材または第２部材の他方に形成される当接部と干渉して第１部材と第２部材との所定量以上の相対変位を規制する。ストッパ部は、ヤング率が、被覆部のヤング率と異なる値に設定されるので、被覆部およびストッパ部が荷重を受けるときの防振装置の静特性を適宜設定できる。よって、静特性設計の自由度を向上できる効果がある。 A stopper portion composed of a rubber-like elastic body is formed on one of the first member and the second member, and protrudes from one of the first member or the second member toward the other of the first member or the second member. The The stopper portion is covered with a covering portion formed of a rubber-like elastic body, and interferes with the contact portion formed on the other of the first member or the second member together with the covering portion, and the first member and the second member The relative displacement of a predetermined amount or more is regulated. Since the Young's modulus of the stopper portion is set to a value different from the Young's modulus of the covering portion, the static characteristics of the vibration isolator when the covering portion and the stopper portion receive a load can be appropriately set. Therefore, there is an effect that the degree of freedom in static characteristic design can be improved.

請求項２記載の防振装置によれば、当接部は、防振基体を構成するゴム状弾性体により防振基体と一体に形成され、当接部により第１部材または第２部材の他方が被覆される。当接部を構成するゴム状弾性体は、被覆部を構成するゴム状弾性体とは異種材質である。よって、請求項１の効果に加え、当接部および被覆部が同じ材質のゴム状弾性体の場合と比較して、当接部と被覆部とが擦れるときに生じる異音を抑制できる効果がある。 According to the vibration isolator of claim 2, the contact portion is formed integrally with the vibration isolation base by the rubber-like elastic body constituting the vibration isolation base, and the other of the first member or the second member by the contact portion. Is coated. The rubber-like elastic body constituting the contact portion is a different material from the rubber-like elastic body constituting the covering portion. Therefore, in addition to the effect of Claim 1, compared with the case where the contact part and the covering part are made of a rubber-like elastic body made of the same material, the effect of suppressing abnormal noise generated when the contact part and the covering part are rubbed is obtained. is there.

請求項３記載の防振装置によれば、ストッパ部は、防振基体を構成するゴム状弾性体により防振基体と一体に形成される。ストッパ部および防振基体は、動的ばね定数が、被覆部の動的ばね定数より小さい値に設定されるので、ストッパ部の非作動時には、動的ばね定数の小さい防振基体による防振効果を得ることができる。また、ストッパ部の作動時には、被覆部より動的ばね定数の小さいストッパ部による防振効果を得ることができる。よって、請求項１又は２の効果に加え、ストッパ部の非作動時および作動時の防振性能を向上できる効果がある。 According to the vibration isolator of claim 3, the stopper portion is formed integrally with the vibration isolating base by the rubber-like elastic body constituting the vibration isolating base. Since the dynamic spring constant of the stopper and the vibration isolating base is set to a value smaller than the dynamic spring constant of the covering, the anti-vibration effect by the vibration isolating base having a small dynamic spring constant when the stopper is not in operation. Can be obtained. Further, when the stopper portion is operated, it is possible to obtain a vibration isolation effect by the stopper portion having a smaller dynamic spring constant than the covering portion. Therefore, in addition to the effect of the first or second aspect, there is an effect that the vibration isolating performance at the time of non-operation and operation of the stopper portion can be improved.

請求項４記載の防振装置によれば、ストッパ部は、当接部へ向かって凸設される凸部が被覆部に被覆されるので、ストッパ部が作動するときには、凸部の先端を起点として変形が開始される。そのため、ストッパ部による静ばね特性を緩やかに上昇させることができる。その結果、請求項１から３のいずれかの効果に加え、ストッパ部が作動を開始するときのフラツキを抑制することができ、ストッパ部を確実に作動できる効果がある。 According to the vibration isolator of the fourth aspect, since the convex portion protruding toward the contact portion is covered with the covering portion, when the stopper portion is actuated, the stopper portion starts from the tip of the convex portion. The deformation starts. Therefore, the static spring characteristic by the stopper portion can be gradually increased. As a result, in addition to the effect of any one of claims 1 to 3, it is possible to suppress a flutter when the stopper portion starts to operate, and there is an effect that the stopper portion can be reliably operated.

請求項５記載の防振装置によれば、ストッパ部は、軸方向端面に係合部が凸設または凹設され、係合部は、被覆部に被覆される。係合部によりストッパ部と被覆部との接触面積を広げることができるので、請求項１から４のいずれかの効果に加え、ストッパ部と被覆部との密着強度を向上できる効果がある。 According to the vibration isolator of the fifth aspect, the stopper portion has the engaging portion protruding or recessed on the axial end surface, and the engaging portion is covered with the covering portion. Since the contact area between the stopper portion and the covering portion can be increased by the engaging portion, in addition to the effect of any one of claims 1 to 4, there is an effect that the adhesion strength between the stopper portion and the covering portion can be improved.

請求項６記載の防振装置によれば、ストッパ部を貫通するすぐり部がストッパ部の端面に開口し、すぐり部が、被覆部と一体に形成される充填部により充填される。すぐり部および充填部によってストッパ部の体積が減少される一方、充填部の分だけ被覆部の体積が増大される。よって、請求項１から５のいずれかの効果に加え、ストッパ部および被覆部がばね特性に寄与する割合を適宜設定できる効果がある。 According to the vibration isolator of the sixth aspect, the straight portion that penetrates the stopper portion opens in the end surface of the stopper portion, and the straight portion is filled by the filling portion that is formed integrally with the covering portion. While the volume of the stopper portion is reduced by the straight portion and the filling portion, the volume of the covering portion is increased by the amount of the filling portion. Therefore, in addition to the effect of any one of claims 1 to 5, there is an effect that the ratio of the stopper portion and the covering portion contributing to the spring characteristics can be appropriately set.

本発明の第１実施の形態における防振装置の平面図である。It is a top view of the vibration isolator in 1st Embodiment of this invention. 図１のＩＩ−ＩＩ線における防振装置の軸方向断面図である。It is an axial sectional view of the vibration isolator taken along line II-II in FIG. 図２のＩＩＩ−ＩＩＩ線における防振装置の軸直角方向断面図である。FIG. 3 is a cross-sectional view in the direction perpendicular to the axis of the vibration isolator taken along line III-III in FIG. 2. 防振装置の軸直角方向における荷重−変位曲線である。It is a load-displacement curve in the direction perpendicular to the axis of the vibration isolator. 第２実施の形態における防振装置の軸方向断面図である。It is axial direction sectional drawing of the vibration isolator in 2nd Embodiment. 第３実施の形態における防振装置の軸方向断面図である。It is axial direction sectional drawing of the vibration isolator in 3rd Embodiment. 第４実施の形態における防振装置の軸直角方向断面図である。It is an axis perpendicular direction sectional view of a vibration isolator in a 4th embodiment. 第５実施の形態における防振装置の軸直角方向断面図である。It is an axial perpendicular direction sectional view of the vibration isolator in 5th Embodiment.

以下、本発明の好ましい実施形態について添付図面を参照して説明する。まず、図１から図３を参照して第１実施の形態について説明する。図１は本発明の第１実施の形態における防振装置１の平面図であり、図２は図１のＩＩ−ＩＩ線における防振装置１の断面図であり、図３は図２のＩＩＩ−ＩＩＩ線における防振装置１の軸直角方向断面図である。なお、矢印Ｕ−Ｄ，Ｌ−Ｒ，Ｆ−Ｂは、防振装置１が搭載される車体（図示せず）の上下方向、左右方向、前後方向をそれぞれ示している。 Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. First, a first embodiment will be described with reference to FIGS. FIG. 1 is a plan view of the vibration isolator 1 according to the first embodiment of the present invention, FIG. 2 is a cross-sectional view of the vibration isolator 1 taken along the line II-II in FIG. 1, and FIG. It is an axial perpendicular direction sectional view of vibration isolator 1 in the -III line. Note that arrows UD, LR, and FB indicate the up-down direction, the left-right direction, and the front-rear direction of the vehicle body (not shown) on which the vibration isolator 1 is mounted.

図１に示すように、防振装置１は、第１部材１０と、第１部材１０の周囲を取り囲む第２部材２０と、それら第１部材１０と第２部材２０との間に介在すると共に弾性材料（ゴム状弾性体）から構成される防振基体３０とを備え、エンジンと車体との振動伝達を抑えつつエンジンの相対変位を抑制し得るように構成される。本実施の形態では、車体側に第１部材１０が、エンジン側に第２部材２０が連結される。第１部材１０は、所定の剛性を有する金属製等の円筒状部材であり、軸方向に貫通形成された貫通孔に挿通されるボルト等の軸状部材（図示せず）により車体側に取り付けられる。 As shown in FIG. 1, the vibration isolator 1 is interposed between the first member 10, the second member 20 surrounding the first member 10, and the first member 10 and the second member 20. And an anti-vibration base 30 made of an elastic material (rubber-like elastic body), and configured to suppress relative displacement of the engine while suppressing vibration transmission between the engine and the vehicle body. In the present embodiment, the first member 10 is connected to the vehicle body side, and the second member 20 is connected to the engine side. The first member 10 is a cylindrical member made of metal or the like having a predetermined rigidity, and is attached to the vehicle body side by a shaft-like member (not shown) such as a bolt inserted through a through-hole formed in the axial direction. It is done.

第２部材２０は、所定の剛性を有する金属製等の円筒状部材であり、偏心位置に第１部材１０を内包すると共に、ブラケット等の連結部材（図示せず）によりエンジン側に取り付けられる。本実施の形態では、第２部材２０は、円筒状に形成される外筒２１と、外筒２１に圧入される中間筒２２とを備えている。中間筒２２の内周面２３及び第１部材１０の外周面１１に防振基体３０がそれぞれ加硫接着され、中間筒２２と第１部材１０との間に防振基体３０が介設される。 The second member 20 is a cylindrical member made of metal or the like having a predetermined rigidity. The second member 20 includes the first member 10 in an eccentric position, and is attached to the engine side by a connecting member (not shown) such as a bracket. In the present embodiment, the second member 20 includes an outer cylinder 21 formed in a cylindrical shape and an intermediate cylinder 22 press-fitted into the outer cylinder 21. The anti-vibration base 30 is vulcanized and bonded to the inner peripheral surface 23 of the intermediate tube 22 and the outer peripheral surface 11 of the first member 10, and the anti-vibration base 30 is interposed between the intermediate tube 22 and the first member 10. .

防振基体３０は、所定の防振性能を有するゴム状弾性体から構成される部位であり、第１部材１０と第２部材２０とを連結し、第１部材１０に対して第２部材２０を弾性支持する。防振基体３０は、第１部材１０の外周面１１を周方向に亘って被覆するゴム膜状の内側膜部３１、及び、第２部材２０の内周面２３を周方向に亘って被覆するゴム膜状の外側膜部３２が一体に加硫成形される。 The anti-vibration base 30 is a part composed of a rubber-like elastic body having a predetermined anti-vibration performance, and connects the first member 10 and the second member 20, and the second member 20 with respect to the first member 10. Elastically support. The anti-vibration base 30 covers the inner peripheral surface 31 of the rubber film that covers the outer peripheral surface 11 of the first member 10 in the circumferential direction and the inner peripheral surface 23 of the second member 20 in the circumferential direction. The rubber film-like outer film part 32 is integrally vulcanized.

第１被覆部４０及び第２被覆部５０は、第１部材１０を挟んで軸直角方向（矢印Ｆ−Ｂ方向）の両側に設けられる部位であり、本実施の形態では、表面が自己潤滑性を有するゴム状弾性体から構成される。表面が自己潤滑性を有する第１被覆部４０及び第２被覆部５０を構成するゴム状弾性体としては、脂肪酸アミド等の潤滑剤がゴム状弾性体の表面にブリードして、表面の摩擦係数を低減して潤滑性を発揮するもの等が用いられる。 The first covering portion 40 and the second covering portion 50 are portions provided on both sides in the direction perpendicular to the axis (the direction of the arrow FB) with the first member 10 interposed therebetween. In the present embodiment, the surface is self-lubricating. It is comprised from the rubber-like elastic body which has this. As the rubber-like elastic bodies constituting the first covering portion 40 and the second covering portion 50 having self-lubricating surfaces, a lubricant such as fatty acid amide bleeds on the surface of the rubber-like elastic body, and the friction coefficient of the surface A material that reduces lubricity and exhibits lubricity is used.

本実施の形態では、第１被覆部４０及び第２被覆部５０は、第１被覆部４０及び第２被覆部５０の径方向内側と第１部材１０との間隔をあけて第２部材２０側に設けられる。また本実施の形態では、防振装置１は、第１部材１０及び第２部材２０の軸方向（図１紙面垂直方向）を車体（図示せず）の上下方向（矢印Ｕ−Ｄ方向）へ向けると共に、第１被覆部４０を車体の前方（矢印Ｆ方向）、第２被覆部５０を車体の後方（矢印Ｂ方向）へ向けて配置される。 In the present embodiment, the first covering portion 40 and the second covering portion 50 are spaced apart from the first member 10 on the second member 20 side with a gap between the first covering portion 40 and the second covering portion 50 in the radial direction. Is provided. In the present embodiment, the vibration isolator 1 is configured so that the axial direction of the first member 10 and the second member 20 (the vertical direction in FIG. 1) is the vertical direction of the vehicle body (not shown) (the arrow UD direction). The first covering portion 40 is disposed forward of the vehicle body (in the direction of arrow F), and the second covering portion 50 is disposed toward the rear of the vehicle body (in the direction of arrow B).

図２及び図３に示すように、第１被覆部４０は第１ストッパ部３３を被覆し、第２被覆部５０は第２ストッパ部３７を被覆する。第１ストッパ部３３及び第２ストッパ部３７は、ゴム状弾性体から構成されると共に防振基体３０、内側膜部３１及び外側膜部３２と一体に加硫成形される。第１ストッパ部３３及び第１被覆部４０は、内側膜部３１の内の第１被覆部４０と対向する当接部３１ａと干渉して、第１部材１０と第２部材２０との相対変位を規制するための部位である。また、第２ストッパ部３７及び第２被覆部５０は、内側膜部３１の内の第２被覆部５０と対向する当接部３１ｂと干渉して、第１部材１０と第２部材２０との相対変位を規制するための部位である。 As shown in FIGS. 2 and 3, the first covering portion 40 covers the first stopper portion 33, and the second covering portion 50 covers the second stopper portion 37. The first stopper portion 33 and the second stopper portion 37 are made of a rubber-like elastic body and are vulcanized and molded integrally with the vibration isolating base 30, the inner film portion 31, and the outer film portion 32. The first stopper portion 33 and the first covering portion 40 interfere with the contact portion 31a of the inner membrane portion 31 that faces the first covering portion 40, so that the relative displacement between the first member 10 and the second member 20 is achieved. It is a part for regulating. Further, the second stopper portion 37 and the second covering portion 50 interfere with the abutting portion 31 b facing the second covering portion 50 in the inner film portion 31, so that the first member 10 and the second member 20 are in contact with each other. This is a part for regulating the relative displacement.

第１ストッパ部３３は、軸方向視して（図３参照）扇形状に形成される部位であり、外側膜部３２に連成される径方向外側の周方向長さが、径方向内側の内面３４の周方向長さより大きく設定される。また、第１ストッパ部３３は、軸直角方向視して（図２参照）径方向外側（矢印Ｆ方向）から径方向内側（矢印Ｂ方向）へ向かうにつれて軸方向長さが漸次小さくなるように設定される。そのため、第１ストッパ部３３の軸方向端面は、径方向外側（矢印Ｆ方向）から径方向内側に向かうにつれて漸次傾斜する傾斜面３５が形成される。 The first stopper portion 33 is a portion formed in a fan shape when viewed in the axial direction (see FIG. 3), and the circumferential length on the radially outer side coupled to the outer membrane portion 32 is the radially inner side. It is set larger than the circumferential length of the inner surface 34. Further, the first stopper portion 33 has an axial length that gradually decreases from the radially outer side (arrow F direction) to the radially inner side (arrow B direction) when viewed in the direction perpendicular to the axis (see FIG. 2). Is set. Therefore, an inclined surface 35 that gradually inclines from the radially outer side (arrow F direction) toward the radially inner side is formed on the axial end surface of the first stopper portion 33.

第１ストッパ部３３は、軸方向（図３紙面垂直方向）に貫通し、傾斜面３５に軸方向端部が開口するすぐり部３６が形成される。すぐり部３６は、軸方向視における第１ストッパ部３３の略中心に形成されると共に、傾斜面３５の開口が軸方向視して円形状に形成される。 The first stopper portion 33 penetrates in the axial direction (perpendicular to the paper surface in FIG. 3), and a straight portion 36 having an axial end portion opened on the inclined surface 35 is formed. The straight portion 36 is formed substantially at the center of the first stopper portion 33 when viewed in the axial direction, and the opening of the inclined surface 35 is formed in a circular shape when viewed in the axial direction.

第２ストッパ部３７は、軸方向視して（図３参照）扇形状に形成される部位であり、第１部材１０を挟んで第１ストッパ部３３の反対側に設けられる。第２ストッパ部３７は、第１ストッパ部３３と同様に、外側膜部３２に連成される径方向外側の周方向長さが、径方向内側の内面３８の周方向長さより大きく設定される。第２ストッパ部３７は、径方向長さが、第１ストッパ部３３の径方向長さより小さく設定される。また、第２ストッパ部３７は、軸直角方向視して（図２参照）径方向外側（矢印Ｂ方向）から径方向内側（矢印Ｆ方向）へ向かうにつれて軸方向長さが漸次小さくなるように設定される。そのため、第２ストッパ部３７は、径方向外側（矢印Ｂ方向）から径方向内側（矢印Ｆ方向）へ向かうにつれて漸次傾斜する傾斜面３９が軸方向端面に形成される。 The second stopper portion 37 is a portion formed in a fan shape when viewed in the axial direction (see FIG. 3), and is provided on the opposite side of the first stopper portion 33 with the first member 10 interposed therebetween. Similarly to the first stopper portion 33, the second stopper portion 37 has a radially outer circumferential length coupled to the outer film portion 32 set to be larger than a circumferential length of the radially inner surface 38. . The second stopper portion 37 is set so that the radial length is smaller than the radial length of the first stopper portion 33. Further, the second stopper portion 37 has an axial length that gradually decreases from the radially outer side (arrow B direction) to the radially inner side (arrow F direction) when viewed in the direction perpendicular to the axis (see FIG. 2). Is set. Therefore, the second stopper portion 37 is formed with an inclined surface 39 that gradually inclines in the axial end surface from the radially outer side (arrow B direction) toward the radially inner side (arrow F direction).

第１被覆部４０は、外側膜部３２の一部、第１ストッパ部３３の軸方向両端面および径方向内側の面を被覆する部位であり、径方向外側の面が外側膜部３２の内面に接着され、径方向内側の面が内側膜部３１と間隔をあけて設けられる。第１被覆部４０は、第１被覆部４０の径方向内側の面から第１ストッパ部３３の内面３４までの径方向厚さが、第１ストッパ部３３の内面３４から外側膜部３２までの径方向厚さより小さく設定されている。また、第１被覆部４０は、軸方向端面が、第１部材１０の軸線に対して略直交するように設定される。第１ストッパ部３３は軸方向端面に傾斜面３５が形成されているので、第１被覆部４０の軸方向端面が第１部材１０の軸線に対して略直交することで、第１被覆部４０は、径方向外側から径方向内側に向かうにつれて、軸方向厚さ（第１被覆部４０の軸方向端面から傾斜面３５までの厚さ）が漸次大きく設定される。 The first covering portion 40 is a portion that covers a part of the outer film portion 32, both axial end surfaces of the first stopper portion 33 and the radially inner surface, and the radially outer surface is the inner surface of the outer film portion 32. And a radially inner surface is provided at a distance from the inner membrane portion 31. The first covering portion 40 has a radial thickness from the radially inner surface of the first covering portion 40 to the inner surface 34 of the first stopper portion 33, from the inner surface 34 of the first stopper portion 33 to the outer film portion 32. It is set smaller than the radial thickness. Further, the first covering portion 40 is set so that the axial end surface thereof is substantially orthogonal to the axis of the first member 10. Since the inclined surface 35 is formed on the axial end surface of the first stopper portion 33, the axial direction end surface of the first covering portion 40 is substantially orthogonal to the axis line of the first member 10, thereby the first covering portion 40. The thickness in the axial direction (thickness from the axial end surface of the first covering portion 40 to the inclined surface 35) is gradually increased from the radially outer side toward the radially inner side.

第１被覆部４０は、内側膜部３１と対向する径方向内側の面に、軸方向（矢印Ｕ−Ｄ方向、図３紙面垂直方向）に沿って突条状に凸設される凸起部４１が複数（本実施の形態では２つ）設けられている。また、第１被覆部４０は、第１ストッパ部３３に貫通形成されるすぐり部３６に充填される充填部４２が連成される。 The first covering portion 40 is a protruding portion that protrudes in a ridge shape along the axial direction (arrow UD direction, vertical direction in FIG. 3) on the radially inner surface facing the inner membrane portion 31. A plurality of 41 (two in this embodiment) are provided. In addition, the first covering portion 40 is coupled with a filling portion 42 that fills a straight portion 36 that is formed through the first stopper portion 33.

第２被覆部５０は、外側膜部３２の一部、第２ストッパ部３７の軸方向両端面および径方向内側の面を被覆する部位であり、径方向外側の面が外側膜部３２の内面に接着され、径方向内側の面が内側膜部３１と間隔をあけて設けられる。第２被覆部５０は、軸方向端面が、第１部材１０の軸線に対して略直交するように設定される。第２ストッパ部３７は軸方向端面に傾斜面３９が形成されているので、第２被覆部５０の軸方向端面が第１部材１０の軸線に対して略直交することで、第２被覆部５０は、径方向外側から径方向内側に向かうにつれて、軸方向厚さ（第２被覆部５０の軸方向端面から傾斜面３９までの厚さ）が漸次大きく設定される。 The second covering portion 50 is a portion that covers a part of the outer film portion 32, both axial end surfaces of the second stopper portion 37 and the radially inner surface, and the radially outer surface is the inner surface of the outer film portion 32. And a radially inner surface is provided at a distance from the inner membrane portion 31. The second covering portion 50 is set so that the axial end surface is substantially orthogonal to the axis of the first member 10. Since the inclined surface 39 is formed on the end surface of the second stopper portion 37 in the axial direction, the second covering portion 50 is formed by the axial end surface of the second covering portion 50 being substantially orthogonal to the axis of the first member 10. The thickness in the axial direction (thickness from the axial end surface of the second covering portion 50 to the inclined surface 39) is gradually increased from the radially outer side toward the radially inner side.

なお、本実施の形態では、第１ストッパ部３３及び第２ストッパ部３７のヤング率は、第１被覆部４０及び第２被覆部５０のヤング率より小さい値に設定され、防振基体３０、第１ストッパ部３３及び第２ストッパ部３７の動的ばね定数は、第１被覆部４０及び第２被覆部５０の動的ばね定数より小さい値に設定される。 In the present embodiment, the Young's modulus of the first stopper portion 33 and the second stopper portion 37 is set to a value smaller than the Young's modulus of the first covering portion 40 and the second covering portion 50, and the vibration isolating substrate 30, The dynamic spring constants of the first stopper part 33 and the second stopper part 37 are set to values smaller than the dynamic spring constants of the first covering part 40 and the second covering part 50.

次に本実施の形態における防振装置１の製造方法について説明する。まず、第１部材１０及び中間筒２２を成形型（図示せず）に装着した後、内側膜部３１及び外側膜部３２を第１部材１０及び第２部材２０に加硫接着させつつ、防振基体３０、内側膜部３１、外側膜部３２、第１ストッパ部３３及び第２ストッパ部３７を一体に加硫成形する。次いで、自己潤滑性を有するゴム状弾性体が得られるゴム組成物を用いて、第１被覆部４０、充填部４２及び第２被覆部５０を加硫成形すると共に、第１被覆部４０、充填部４２及び第２被覆部５０をそれぞれ第１ストッパ部３３及び第２ストッパ部３７に接着する。これにより、第１部材１０及び中間筒２２が一体化した成形体が得られる。成形型（図示せず）から成形体を取り出した後、成形体の中間筒２２を外筒２１に圧入して、防振装置１が得られる。 Next, the manufacturing method of the vibration isolator 1 in this Embodiment is demonstrated. First, after the first member 10 and the intermediate cylinder 22 are mounted on a mold (not shown), the inner film portion 31 and the outer film portion 32 are vulcanized and bonded to the first member 10 and the second member 20, while The vibration base 30, the inner film part 31, the outer film part 32, the first stopper part 33, and the second stopper part 37 are integrally vulcanized. Next, using the rubber composition from which a rubber-like elastic body having self-lubricating properties is obtained, the first covering portion 40, the filling portion 42 and the second covering portion 50 are vulcanized and molded, and the first covering portion 40 and the filling portion are filled. The part 42 and the second covering part 50 are bonded to the first stopper part 33 and the second stopper part 37, respectively. As a result, a molded body in which the first member 10 and the intermediate cylinder 22 are integrated is obtained. After removing the molded body from the molding die (not shown), the intermediate cylinder 22 of the molded body is press-fitted into the outer cylinder 21 to obtain the vibration isolator 1.

次に図４を参照して、第１ストッパ部３３及び第１被覆部４０の軸直角方向（矢印Ｆ−Ｂ方向）の静ばね特性について説明する。図４は、例えば自動車の加速運転時に第１ストッパ部３３及び第１被覆部４０が作動する前後の静ばねの変化を連続的に示した荷重−変位曲線である。 Next, the static spring characteristics of the first stopper portion 33 and the first covering portion 40 in the direction perpendicular to the axis (arrow FB direction) will be described with reference to FIG. FIG. 4 is a load-displacement curve showing continuously the change of the static spring before and after the first stopper portion 33 and the first covering portion 40 are actuated, for example, during acceleration operation of the automobile.

図４に示す比較例１は、第１ストッパ部３３及び第１被覆部４０が設けられていない以外は、本実施の形態における防振装置１と同一に構成された防振装置の荷重−変位曲線である。比較例１における防振装置によれば、第１部材１０（内側膜部３１）と第２部材２０（外側膜部３２）とが干渉するまでは、防振基体３０による柔らかいばね特性が得られる。第１部材１０と第２部材２０とが干渉した後は、曲線の傾きが急激に立ち上がる非線形の荷重−変位曲線を有している。比較例１における防振装置によれば、第１ストッパ部３３及び第１被覆部４０が設けられていないので、防振基体３０の変形量が大きくなり、防振基体３０の耐久性が低下する。 The comparative example 1 shown in FIG. 4 is the load-displacement of the vibration isolator configured the same as the vibration isolator 1 in the present embodiment except that the first stopper portion 33 and the first covering portion 40 are not provided. It is a curve. According to the vibration isolator in Comparative Example 1, until the first member 10 (inner film part 31) and the second member 20 (outer film part 32) interfere with each other, a soft spring characteristic by the vibration isolating substrate 30 is obtained. . After the first member 10 and the second member 20 interfere with each other, there is a non-linear load-displacement curve in which the slope of the curve rapidly rises. According to the vibration isolator in Comparative Example 1, since the first stopper portion 33 and the first covering portion 40 are not provided, the deformation amount of the vibration isolating substrate 30 is increased, and the durability of the vibration isolating substrate 30 is reduced. .

比較例２は、第１被覆部４０が設けられていない以外は、本実施の形態における防振装置１と同一に構成された防振装置の荷重−変位曲線である。比較例２における防振装置によれば、第１部材１０（内側膜部３１）と第１ストッパ部３３とが干渉するまでは、防振基体３０による柔らかいばね特性が得られる。第１部材１０と第１ストッパ部３３とが干渉した後は、第１ストッパ部３３が圧縮されることで剛性が次第に高くなる。しかし、第２部材２０に対する第１部材１０の最終的な変位量は、第１ストッパ部３３の圧縮量に依存して、比較例１における防振装置に近づく。そのため、防振基体３０の変形量が大きくなり、防振基体３０の耐久性が低下する。また、第１ストッパ部３３と内側膜部３１とは同種のゴム状弾性体から構成されるので、第１ストッパ部３３と第１部材１０（内側膜部３１）とが擦れるときに異音が生じ易い。 The comparative example 2 is a load-displacement curve of the vibration isolator configured in the same manner as the vibration isolator 1 in the present embodiment except that the first covering portion 40 is not provided. According to the vibration isolator in the comparative example 2, until the first member 10 (inner film portion 31) and the first stopper portion 33 interfere with each other, a soft spring characteristic by the vibration isolating base 30 is obtained. After the first member 10 and the first stopper portion 33 interfere with each other, the first stopper portion 33 is compressed, so that the rigidity gradually increases. However, the final displacement amount of the first member 10 with respect to the second member 20 approaches the vibration isolator in Comparative Example 1 depending on the compression amount of the first stopper portion 33. For this reason, the amount of deformation of the vibration isolating base 30 increases, and the durability of the vibration isolating base 30 decreases. Further, since the first stopper portion 33 and the inner film portion 31 are made of the same type of rubber-like elastic body, abnormal noise is generated when the first stopper portion 33 and the first member 10 (inner film portion 31) are rubbed. It is likely to occur.

実施例は、防振装置１の荷重−変位曲線である。実施例における防振装置１によれば、第１部材１０（内側膜部３１）と第１被覆部４０とが干渉するまでは、動的ばね定数の小さい防振基体３０による防振効果を得ることができる。第１部材１０と第１被覆部４０とが干渉した後は、第１被覆部４０を介して第１ストッパ部３３が圧縮される。第１ストッパ部３３によって、第１被覆部４０に第１部材１０が衝突したときの衝撃を緩和して、ショックの発生を防止できる。また、第１被覆部４０と内側膜部３１とは異種材質であるので、第１被覆部４０と第１部材１０（内側膜部３１）とが擦れるときに生じる異音を抑制できる。さらに、第１被覆部４０は、表面が自己潤滑性を有するゴム状弾性体から構成されているので、その自己潤滑性によって異音を生じ難くできる。 An example is a load-displacement curve of the vibration isolator 1. According to the vibration isolator 1 in the embodiment, until the first member 10 (inner film portion 31) and the first covering portion 40 interfere with each other, the vibration isolating effect by the vibration isolating base 30 having a small dynamic spring constant is obtained. be able to. After the first member 10 and the first covering portion 40 interfere with each other, the first stopper portion 33 is compressed via the first covering portion 40. The first stopper portion 33 can mitigate the impact when the first member 10 collides with the first covering portion 40 and can prevent the occurrence of the shock. Moreover, since the 1st coating | coated part 40 and the inner side film | membrane part 31 are different materials, the noise which arises when the 1st coating | coated part 40 and the 1st member 10 (inner film | membrane part 31) rub can be suppressed. Furthermore, since the surface of the first covering portion 40 is made of a rubber-like elastic body having a self-lubricating property, abnormal noise can be hardly generated due to the self-lubricating property.

なお、第１ストッパ部３３が圧縮されると次第に剛性が高くなるが、第１被覆部４０より動的ばね定数の小さい第１ストッパ部３３により、振動（例えばエンジンが発する比較的高周波の振動など）が第１被覆部４０及び第１ストッパ部３３を介して車体側に伝達されることが抑制される。その結果、車室内のこもり音を軽減できる。 Although the rigidity gradually increases as the first stopper portion 33 is compressed, the first stopper portion 33 having a smaller dynamic spring constant than the first covering portion 40 causes vibration (for example, relatively high-frequency vibration generated by the engine). ) Is suppressed from being transmitted to the vehicle body via the first covering portion 40 and the first stopper portion 33. As a result, it is possible to reduce the muffled noise in the passenger compartment.

第１ストッパ部３３が圧縮された後は、圧縮された第１ストッパ部３３及びヤング率の大きい第１被覆部４０が、第１部材１０及び第２部材２０に直列に介設されるので、第２部材２０に対する第１部材１０の変位が規制される。よって、第１ストッパ部３３が荷重を受けるときの柔らかいばね特性と、第１ストッパ部３３が圧縮した後の第１被覆部４０による変位規制とを両立できる。 After the first stopper portion 33 is compressed, the compressed first stopper portion 33 and the first covering portion 40 having a large Young's modulus are interposed in series with the first member 10 and the second member 20. The displacement of the first member 10 relative to the second member 20 is restricted. Therefore, it is possible to achieve both soft spring characteristics when the first stopper portion 33 receives a load and displacement regulation by the first covering portion 40 after the first stopper portion 33 is compressed.

なお、第１被覆部４０は、当接部３１ａへ向かう凸起部４１が、軸方向（矢印Ｕ−Ｄ方向）に沿う突条状に径方向内側の面に凸設されている。第１被覆部４０が当接部３１ａへ当接するときには、凸起部４１の先端を起点として変形が開始される。そのため、第１ストッパ部３３よりヤング率の大きい第１被覆部４０による静ばね特性を緩やかに上昇させることができる。その結果、第１被覆部４０が作動を開始する（変形を開始する）ときのフラツキを抑制することができ、第１被覆部４０を確実に作動できる。 In the first covering portion 40, a protruding portion 41 directed toward the contact portion 31a is provided on the radially inner surface in a protruding shape along the axial direction (arrow UD direction). When the first covering part 40 comes into contact with the contact part 31a, the deformation starts with the tip of the protruding part 41 as a starting point. Therefore, the static spring characteristic by the 1st coating | coated part 40 with a larger Young's modulus than the 1st stopper part 33 can be raised gently. As a result, it is possible to suppress a flutter when the first covering portion 40 starts operating (starts deformation), and the first covering portion 40 can be reliably operated.

ここで、第１被覆部４０は、第１ストッパ部３３の傾斜面３５に接着されると共に、径方向外側から径方向内側に向かうにつれて、軸方向厚さ（第１被覆部４０の軸方向端面から傾斜面３５までの厚さ）が漸次大きく設定されている。また、第１被覆部４０は、第１被覆部４０の径方向内側の面から第１ストッパ部３３の内面３４までの径方向厚さが、第１ストッパ部３３の内面３４から外側膜部３２までの径方向厚さより小さく設定されている。 Here, the first covering portion 40 is bonded to the inclined surface 35 of the first stopper portion 33, and the axial thickness (the axial end surface of the first covering portion 40 is increased from the radially outer side toward the radially inner side. To the inclined surface 35) is gradually set larger. The first covering portion 40 has a radial thickness from the radially inner surface of the first covering portion 40 to the inner surface 34 of the first stopper portion 33, so that the outer film portion 32 extends from the inner surface 34 of the first stopper portion 33. It is set smaller than the thickness in the radial direction.

そのため、第１部材１０と第２部材２０とが軸直角方向（矢印Ｆ−Ｄ方向）へ相対変位して第１部材１０が第１被覆部４０に押し付けられると、第１ストッパ部３３を軸方向および径方向に圧縮変形させる荷重を第１ストッパ３３の傾斜面３５に作用させることができる。その結果、第１ストッパ部３３を圧縮変形させ易くなるので、第１ストッパ部３３の静ばね特性が十分に発揮される。 Therefore, when the first member 10 and the second member 20 are relatively displaced in the direction perpendicular to the axis (the direction of the arrow FD) and the first member 10 is pressed against the first covering portion 40, the first stopper portion 33 is pivoted. A load that compresses and deforms in the direction and the radial direction can be applied to the inclined surface 35 of the first stopper 33. As a result, the first stopper portion 33 is easily compressed and deformed, so that the static spring characteristics of the first stopper portion 33 are sufficiently exhibited.

なお、第１ストッパ部３３は、第１ストッパ部３３を軸方向に貫通する貫通孔３６が形成されており、その貫通孔３６に第１被覆部４０と同じ材質のゴム状弾性体から構成される充填部４２が充填されている。その結果、第１ストッパ部３３よりヤング率の大きな第１被覆部４０及び充填部４２によって、第１部材１０と第２部材２０との変位規制効果を高めることができる。また、充填部４２が第１ストッパ部３３の軸方向に貫設されると共に第１被覆部４０に連成されているので、第１ストッパ部３３から第１被覆部４０を脱落させ難くできる。 The first stopper portion 33 is formed with a through hole 36 that penetrates the first stopper portion 33 in the axial direction, and the through hole 36 is made of a rubber-like elastic body made of the same material as the first covering portion 40. The filling portion 42 is filled. As a result, the displacement restricting effect between the first member 10 and the second member 20 can be enhanced by the first covering portion 40 and the filling portion 42 having a higher Young's modulus than the first stopper portion 33. In addition, since the filling portion 42 penetrates in the axial direction of the first stopper portion 33 and is continuous with the first covering portion 40, it is difficult to drop the first covering portion 40 from the first stopper portion 33.

次に図５を参照して第２実施の形態について説明する。第１実施の形態では、第１ストッパ部３３を軸方向に貫通するすぐり部３６が形成され、そのすぐり部３６に自己潤滑性を有するゴム状弾性体から構成される充填部４２が充填される場合について説明した。これに対し第２実施の形態では、すぐり部３６に代えて、凸起からなる係合部１０２が第１ストッパ部３３の軸方向端面に凸設される場合について説明する。なお、第１実施の形態と同一の部分については、同一の符号を付して以下の説明を省略する。図５は第２実施の形態における防振装置１０１の軸方向断面図である。 Next, a second embodiment will be described with reference to FIG. In the first embodiment, a straight portion 36 that penetrates the first stopper portion 33 in the axial direction is formed, and the straight portion 36 is filled with a filling portion 42 made of a rubber-like elastic body having self-lubricating properties. Explained the case. On the other hand, in the second embodiment, a case will be described in which, instead of the straight portion 36, an engaging portion 102 made of a protrusion is provided on the axial end surface of the first stopper portion 33. In addition, about the part same as 1st Embodiment, the same code | symbol is attached | subjected and the following description is abbreviate | omitted. FIG. 5 is a sectional view in the axial direction of the vibration isolator 101 according to the second embodiment.

図５に示すように防振装置１０１は、軸方向に沿って略半球状に凸設される係合部１０２が、第１ストッパ部３３の軸方向両端面に第１ストッパ部３３と一体に加硫成形されており、第１被覆部４０は、係合部１０２を被覆するように設けられている。本実施の形態では、係合部１０２は第１ストッパ部３３の軸方向端面に１つずつ設けられている。係合部１０２により第１ストッパ部３３と第１被覆部４０との接触面積を広げることができるので、第１ストッパ部３３と第１被覆部４０との密着強度を向上できる。また、係合部１０２の分だけ、ヤング率の大きい第１被覆部４０の体積を減少させることができるので、第１被覆部４０の静ばね特性を緩和して、若干柔らかいばね特性を得ることができる。 As shown in FIG. 5, in the vibration isolator 101, the engaging portions 102 that are projected in a substantially hemispherical shape along the axial direction are integrated with the first stopper portion 33 at both axial end surfaces of the first stopper portion 33. The first covering portion 40 is vulcanized and formed so as to cover the engaging portion 102. In the present embodiment, one engaging portion 102 is provided on each axial end surface of the first stopper portion 33. Since the contact area between the first stopper portion 33 and the first covering portion 40 can be increased by the engaging portion 102, the adhesion strength between the first stopper portion 33 and the first covering portion 40 can be improved. Moreover, since the volume of the 1st coating | coated part 40 with a large Young's modulus can be reduced by the amount of the engaging part 102, the static spring characteristic of the 1st coating | coated part 40 is relieve | moderated and a slightly soft spring characteristic is acquired. Can do.

次に図６を参照して第３実施の形態について説明する。第２実施の形態では、凸起からなる係合部１０２が第１ストッパ部３３の軸方向端面に凸設される場合について説明した。これに対し第３実施の形態では、凹部からなる係合部２０２が第１ストッパ部３３の軸方向端面に凹設される場合について説明する。なお、第１実施の形態と同一の部分については、同一の符号を付して以下の説明を省略する。図６は第３実施の形態における防振装置２０１の軸方向断面図である。 Next, a third embodiment will be described with reference to FIG. In the second embodiment, the case has been described in which the protruding engaging portion 102 is provided on the axial end surface of the first stopper portion 33. On the other hand, in the third embodiment, a case will be described in which the engaging portion 202 formed of a concave portion is recessed on the axial end surface of the first stopper portion 33. In addition, about the part same as 1st Embodiment, the same code | symbol is attached | subjected and the following description is abbreviate | omitted. FIG. 6 is an axial cross-sectional view of the vibration isolator 201 in the third embodiment.

図６に示すように防振装置２０１は、第１ストッパ部３３の軸方向両端面に略半球状の係合部２０２が凹設されている。第１被覆部４０は、係合部２０２を被覆するように設けられている。本実施の形態では、係合部２０２は第１ストッパ部３３の軸方向端面に１つずつ設けられている。係合部２０２により第１ストッパ部３３と第１被覆部４０との接触面積を広げることができるので、第１ストッパ部３３と第１被覆部４０との密着強度を向上できる。また、係合部２０２の分だけ、ヤング率の大きい第１被覆部４０の体積を増加させることができるので、第１被覆部４０による変位規制効果を若干高めることができる。 As shown in FIG. 6, the vibration isolator 201 has a substantially hemispherical engagement portion 202 recessed on both axial end surfaces of the first stopper portion 33. The first covering portion 40 is provided so as to cover the engaging portion 202. In the present embodiment, one engaging portion 202 is provided on each end surface in the axial direction of the first stopper portion 33. Since the contact area between the first stopper portion 33 and the first covering portion 40 can be increased by the engaging portion 202, the adhesion strength between the first stopper portion 33 and the first covering portion 40 can be improved. Moreover, since the volume of the 1st coating | coated part 40 with a large Young's modulus can be increased by the amount of the engaging part 202, the displacement control effect by the 1st coating | coated part 40 can be raised a little.

次に図７を参照して第４実施の形態について説明する。第１実施の形態から第３実施の形態では、第１ストッパ部４０は、ヤング率が、第１被覆部５０のヤング率より小さい値に設定され、第１ストッパ部４０及び防振基体３０は、動的ばね定数が、第１被覆部５０の動的ばね定数より小さい値に設定される場合について説明した。これに対し第４実施の形態では、第１ストッパ部３０２は、ヤング率が、第１被覆部３０４のヤング率より大きい値に設定され、第１ストッパ部３０２及び防振基体３０は、動的ばね定数が、第１被覆部３０４の動的ばね定数より小さい値に設定される場合について説明する。なお、第１実施の形態と同一の部分については、同一の符号を付して以下の説明を省略する。図７は第４実施の形態における防振装置３０１の軸直角方向断面図である。 Next, a fourth embodiment will be described with reference to FIG. In the first to third embodiments, the first stopper portion 40 has a Young's modulus set to a value smaller than the Young's modulus of the first covering portion 50, and the first stopper portion 40 and the vibration isolation base 30 are The case where the dynamic spring constant is set to a value smaller than the dynamic spring constant of the first covering portion 50 has been described. On the other hand, in the fourth embodiment, the Young's modulus of the first stopper portion 302 is set to a value larger than the Young's modulus of the first covering portion 304, and the first stopper portion 302 and the vibration isolating base 30 are dynamic. A case where the spring constant is set to a value smaller than the dynamic spring constant of the first covering portion 304 will be described. In addition, about the part same as 1st Embodiment, the same code | symbol is attached | subjected and the following description is abbreviate | omitted. FIG. 7 is a cross-sectional view in the direction perpendicular to the axis of the vibration isolator 301 according to the fourth embodiment.

図７に示すように防振装置３０１は、防振基体３０と一体に加硫成形される第１ストッパ部３０２と、ゴム状弾性体から構成されると共に第１ストッパ部３０２を被覆する第１被覆部３０４とを備えている。第１ストッパ部３０２は、当接部３１ａに向かって凸設される凸部３０３が、当接部３１ａとの対向面に軸方向（図７紙面垂直方向）に延びる突条状に設けられている。本実施の形態では、２本の凸部３０３が第１ストッパ部３０２と一体に形成されており、凸部３０３は第１被覆部３０４に覆われている。なお、第１ストッパ部３０２は、ヤング率が、第１被覆部３０４のヤング率より大きい値に設定され、第１ストッパ部３０２及び防振基体３０は、動的ばね定数が、第１被覆部３０４の動的ばね定数より小さい値に設定されている。 As shown in FIG. 7, the vibration isolator 301 includes a first stopper portion 302 that is vulcanized and molded integrally with the vibration proof base 30, and a first stopper portion 302 that is formed of a rubber-like elastic body and covers the first stopper portion 302. And a covering portion 304. The first stopper portion 302 is provided with a protruding portion 303 protruding toward the contact portion 31a in a protruding shape extending in the axial direction (vertical direction in FIG. 7) on the surface facing the contact portion 31a. Yes. In the present embodiment, two convex portions 303 are formed integrally with the first stopper portion 302, and the convex portion 303 is covered with the first covering portion 304. The first stopper portion 302 has a Young's modulus set to a value larger than the Young's modulus of the first covering portion 304, and the first stopper portion 302 and the vibration isolating base 30 have a dynamic spring constant that is the first covering portion. A value smaller than the dynamic spring constant of 304 is set.

次に、第１ストッパ部３０２及び第１被覆部３０４の軸直角方向（矢印Ｆ−Ｂ方向）の静ばね特性について説明する。例えば自動車の加速運転時に第１ストッパ部３０２及び第１被覆部３０４が作動する場合には、第１部材１０と第１被覆部３０４とが干渉した後は、第１被覆部３０４が荷重を受けることによる柔らかいばね特性を得ることができる。その結果、第１被覆部３０４に第１部材１０が衝突したときの衝撃を緩和して、ショックの発生を防止できる。また、第１被覆部３０４と当接部３１ａとが異種材質なので、当接部３１ａと第１被覆部３０４とが擦れるときの異音の発生を抑制できる。 Next, the static spring characteristics of the first stopper portion 302 and the first covering portion 304 in the direction perpendicular to the axis (arrow FB direction) will be described. For example, when the first stopper portion 302 and the first covering portion 304 are activated during the acceleration operation of the automobile, the first covering portion 304 receives a load after the first member 10 and the first covering portion 304 interfere with each other. Soft spring characteristics can be obtained. As a result, it is possible to reduce the impact when the first member 10 collides with the first covering portion 304 and prevent the occurrence of the shock. Further, since the first covering portion 304 and the contact portion 31a are made of different materials, it is possible to suppress the generation of abnormal noise when the contact portion 31a and the first covering portion 304 are rubbed.

第１被覆部３０４が圧縮されることで剛性が次第に高くなるが、第１ストッパ部３０２より動的ばね定数の小さい第１被覆部３０４により、振動（例えばエンジンが発する比較的高周波の振動など）が第１ストッパ部３０２及び第１被覆部３０４を介して車体側に伝達されることが抑制される。その結果、車室内のこもり音を軽減できる。 Although the rigidity gradually increases as the first covering portion 304 is compressed, the first covering portion 304 having a smaller dynamic spring constant than the first stopper portion 302 vibrates (for example, a relatively high-frequency vibration generated by the engine). Is transmitted to the vehicle body side through the first stopper portion 302 and the first covering portion 304. As a result, it is possible to reduce the muffled noise in the passenger compartment.

第１被覆部３０４が圧縮されて第１ストッパ部３０２の変形が開始されるときには、凸部３０３の先端を起点として変形が開始される。そのため、第１被覆部３０４よりヤング率の大きい第１ストッパ部３０２による静ばね特性を、緩やかに上昇させることができる。その結果、第１ストッパ部３０２が作動を開始する（変形を開始する）ときのフラツキを抑制することができ、第１ストッパ部３０２を確実に作動できる。 When the first covering portion 304 is compressed and the deformation of the first stopper portion 302 is started, the deformation is started with the tip of the convex portion 303 as a starting point. Therefore, the static spring characteristic by the 1st stopper part 302 with a larger Young's modulus than the 1st coating | coated part 304 can be raised gently. As a result, it is possible to suppress a flutter when the first stopper portion 302 starts to operate (starts deformation), and the first stopper portion 302 can be reliably operated.

第１ストッパ部３０２及び第１被覆部３０４が圧縮された後は、圧縮された第１被覆部３０４及びヤング率の大きい第１ストッパ部３０２が、第１部材１０及び第２部材２０に直列に介設されるので、第２部材２０に対する第１部材１０の変位が規制される。よって、第１被覆部３０４が荷重を受けるときの柔らかいばね特性と、第１被覆部３０４が圧縮した後の第１ストッパ部３０２による変位規制とを両立できる。 After the first stopper portion 302 and the first covering portion 304 are compressed, the compressed first covering portion 304 and the first stopper portion 302 having a large Young's modulus are in series with the first member 10 and the second member 20. Since it is interposed, the displacement of the first member 10 relative to the second member 20 is restricted. Therefore, it is possible to achieve both soft spring characteristics when the first covering portion 304 receives a load and displacement restriction by the first stopper portion 302 after the first covering portion 304 is compressed.

なお、防振装置３０１は、凸部３０３により第１ストッパ部３０２と第１被覆部３０４０との接触面積を広げることができるので、第１ストッパ部３０２と第１被覆部３０４との密着強度を向上できる。また、第１ストッパ部３０２と第１被覆部３０４との界面部分において、凸部３０３の分だけ、ヤング率の大きい第１被覆部３０４の体積を減少させることができる。その結果、第１ストッパ部３０２と第１被覆部３０４との界面部分については、第１被覆部３０４の静ばね特性を緩和して、若干柔らかいばね特性を得ることができる。 The vibration isolator 301 can increase the contact area between the first stopper portion 302 and the first covering portion 3040 by the convex portion 303, so that the adhesion strength between the first stopper portion 302 and the first covering portion 304 can be increased. It can be improved. Moreover, the volume of the 1st coating | coated part 304 with a large Young's modulus can be reduced by the part of the convex part 303 in the interface part of the 1st stopper part 302 and the 1st coating | coated part 304. FIG. As a result, at the interface portion between the first stopper portion 302 and the first covering portion 304, the static spring characteristics of the first covering portion 304 can be relaxed, and a slightly soft spring characteristic can be obtained.

次に図８を参照して第５実施の形態について説明する。第１実施の形態から第４実施の形態では、第１ストッパ部３３，３０２及び第２ストッパ部３７が、防振基体３０の成形と同時に成形される場合について説明した。これに対し第５実施の形態では、防振基体３０の成形と同時に、第１被覆部４０２及び第２被覆部４０６が成形される場合について説明する。なお、第１実施の形態と同一の部分については、同一の符号を付して以下の説明を省略する。図８は第５実施の形態における防振装置４０１の軸直角方向断面図である。 Next, a fifth embodiment will be described with reference to FIG. In the first to fourth embodiments, the case where the first stopper portions 33 and 302 and the second stopper portion 37 are formed simultaneously with the formation of the vibration isolating base 30 has been described. In contrast, in the fifth embodiment, a case will be described in which the first covering portion 402 and the second covering portion 406 are formed simultaneously with the formation of the vibration-proof base 30. In addition, about the part same as 1st Embodiment, the same code | symbol is attached | subjected and the following description is abbreviate | omitted. FIG. 8 is a cross-sectional view perpendicular to the axis of the vibration isolator 401 according to the fifth embodiment.

図８に示すように防振装置４０１は、中間筒２２に加硫接着される第１ストッパ部４０２及び第２ストッパ部４０５と、防振基体３０と一体に加硫成形されると共に第１ストッパ部４０２及び第２ストッパ部４０５の各々に接着され各々を被覆する第１被覆部４０４及び第２被覆部４０６とを備えている。第１ストッパ部４０２、第２ストッパ部４０５、第１被覆部４０４及び第２被覆部４０６は、いずれもゴム状弾性体から構成される。 As shown in FIG. 8, the vibration isolator 401 is vulcanized and molded integrally with the vibration isolator base 30 and the first stopper portion 402 and the second stopper portion 405 that are vulcanized and bonded to the intermediate cylinder 22. A first covering portion 404 and a second covering portion 406 that are bonded to and cover the portion 402 and the second stopper portion 405, respectively. The first stopper portion 402, the second stopper portion 405, the first covering portion 404, and the second covering portion 406 are all made of a rubber-like elastic body.

第１ストッパ部４０２は、当接部３１ａに向かって凸設される凸部４０３が、当接部３１ａとの対向面に軸方向（図８紙面垂直方向）に延びる突条状に設けられている。なお、第１ストッパ部４０２及び第２ストッパ部４０５は、ヤング率が、第１被覆部４０４及び第２被覆部４０６のヤング率より大きい値に設定される。また、第１被覆部４０４、第２被覆部４０６及び防振基体３０は、動的ばね定数が、第１ストッパ部４０２及び第２ストッパ部４０５の動的ばね定数より小さい値に設定される。 The first stopper portion 402 is provided with a protruding portion 403 protruding toward the contact portion 31a in a protruding shape extending in the axial direction (perpendicular to the plane of FIG. 8) on the surface facing the contact portion 31a. Yes. The first stopper portion 402 and the second stopper portion 405 have a Young's modulus set to a value larger than the Young's modulus of the first covering portion 404 and the second covering portion 406. Further, the dynamic spring constants of the first covering portion 404, the second covering portion 406, and the vibration isolating base 30 are set to values smaller than the dynamic spring constants of the first stopper portion 402 and the second stopper portion 405.

次に、第１ストッパ部４０２及び第１被覆部４０４の軸直角方向（矢印Ｆ−Ｂ方向）の静ばね特性について説明する。例えば自動車の加速運転時に第１ストッパ部４０２及び第１被覆部４０４が作動する場合には、第１部材１０（当接部３１ａ）と第１被覆部４０４とが干渉した後、第１被覆部４０４が荷重を受けることによる柔らかいばね特性を得ることができる。その結果、第１被覆部４０４に第１部材１０が衝突したときの衝撃を緩和して、ショックの発生を防止できる。 Next, static spring characteristics of the first stopper portion 402 and the first covering portion 404 in the direction perpendicular to the axis (the direction of the arrow FB) will be described. For example, when the first stopper portion 402 and the first covering portion 404 operate during acceleration operation of the automobile, the first covering portion is interfered with after the first member 10 (contact portion 31a) and the first covering portion 404 interfere. A soft spring characteristic can be obtained by receiving a load on 404. As a result, the impact when the first member 10 collides with the first covering portion 404 can be reduced, and the occurrence of the shock can be prevented.

第１被覆部４０４が圧縮されることで剛性が次第に高くなるが、第１ストッパ部４０２より動的ばね定数の小さい第１被覆部４０４により、振動（例えばエンジンが発する比較的高周波の振動など）が第１ストッパ部４０２及び第１被覆部４０４を介して車体側に伝達されることが抑制される。その結果、車室内のこもり音を軽減できる。 Although the rigidity gradually increases as the first covering portion 404 is compressed, the first covering portion 404 having a smaller dynamic spring constant than the first stopper portion 402 vibrates (for example, a relatively high-frequency vibration generated by the engine). Is transmitted to the vehicle body side through the first stopper portion 402 and the first covering portion 404. As a result, it is possible to reduce the muffled noise in the passenger compartment.

第１被覆部４０４が圧縮されて第１ストッパ部４０２の変形が開始されるときには、凸部４０３の先端を起点として変形が開始される。そのため、第１被覆部４０４よりヤング率の大きい第１ストッパ部４０２による静ばね特性を、緩やかに上昇させることができる。その結果、第１ストッパ部４０２が作動を開始する（変形を開始する）ときのフラツキを抑制することができ、第１ストッパ部４０２を確実に作動できる。 When the first covering portion 404 is compressed and the deformation of the first stopper portion 402 is started, the deformation is started with the tip of the convex portion 403 as a starting point. Therefore, the static spring characteristic by the 1st stopper part 402 with a larger Young's modulus than the 1st coating | coated part 404 can be raised gently. As a result, it is possible to suppress a flutter when the first stopper portion 402 starts to operate (starts deformation), and the first stopper portion 402 can be reliably operated.

第１ストッパ部４０２及び第１被覆部４０４が圧縮された後は、圧縮された第１被覆部４０４及びヤング率の大きい第１ストッパ部４０２が、第１部材１０及び第２部材２０に直列に介設されるので、第２部材２０に対する第１部材１０の変位が規制される。よって、第１被覆部４０４が荷重を受けるときの柔らかいばね特性と、第１被覆部４０４が圧縮した後の第１ストッパ部４０２による変位規制とを両立できる。 After the first stopper portion 402 and the first covering portion 404 are compressed, the compressed first covering portion 404 and the first stopper portion 402 having a large Young's modulus are in series with the first member 10 and the second member 20. Since it is interposed, the displacement of the first member 10 relative to the second member 20 is restricted. Therefore, it is possible to achieve both soft spring characteristics when the first covering portion 404 receives a load and displacement restriction by the first stopper portion 402 after the first covering portion 404 is compressed.

なお、防振装置４０１は、凸部４０３により第１ストッパ部４０２と第１被覆部４０４０との接触面積を広げることができるので、第１ストッパ部４０２と第１被覆部４０４との密着強度を向上できる。また、第１ストッパ部４０２と第１被覆部４０４との界面部分において、凸部４０３の分だけ、ヤング率の大きい第１ストッパ部４０２の体積を減少させることができる。その結果、第１ストッパ部４０２と第１被覆部４０４との界面部分については、第１ストッパ部４０２の静ばね特性を緩和して、若干柔らかいばね特性を得ることができる。 In addition, since the vibration isolator 401 can expand the contact area between the first stopper portion 402 and the first covering portion 4040 by the convex portion 403, the adhesion strength between the first stopper portion 402 and the first covering portion 404 can be increased. It can be improved. Further, at the interface portion between the first stopper portion 402 and the first covering portion 404, the volume of the first stopper portion 402 having a large Young's modulus can be reduced by the amount of the convex portion 403. As a result, with respect to the interface portion between the first stopper portion 402 and the first covering portion 404, the static spring characteristics of the first stopper portion 402 can be relaxed and slightly soft spring characteristics can be obtained.

以上、実施の形態に基づき本発明を説明したが、本発明は上記実施の形態に何ら限定されるものではなく、本発明の趣旨を逸脱しない範囲内で種々の改良変形が可能であることは容易に推察できるものである。例えば、上記実施の形態で挙げた数値や形状（例えば各構成の数量や寸法、形状等）は一例であり、他の数値や形状を採用することは当然可能である。 The present invention has been described above based on the embodiments. However, the present invention is not limited to the above embodiments, and various improvements and modifications can be made without departing from the spirit of the present invention. It can be easily guessed. For example, the numerical values and shapes (for example, the number, size, shape, and the like of each component) given in the above embodiment are examples, and other numerical values and shapes can naturally be adopted.

また、上記の各実施形態は、それぞれ、他の実施形態が有する構成の一部または複数部分を、その実施形態に追加し或いはその実施形態の構成の一部または複数部分と交換等することにより、その実施形態を変形して構成するようにしても良い。例えば、第１実施の形態で説明した凸起部４１を、第４実施の形態や第５実施の形態で説明した第１被覆部３０４，４０４に設けることができる。また、第１実施の形態で説明したすぐり部３６及び充填部４２を、第４実施の形態で説明した第１ストッパ部３０２及び第１被覆部３０４や、第５実施の形態で説明した第１ストッパ部４０２及び第１被覆部４０４に設けることができる。また、第２実施の形態および第３実施の形態で説明した係合部１０２，２０２を、第４実施の形態や第５実施の形態で説明した第１ストッパ部３０２，４０２に設けることができる。 In addition, in each of the above embodiments, a part or a plurality of parts of the configuration of the other embodiments are added to the embodiment or replaced with a part or a plurality of parts of the configuration of the embodiment. The embodiment may be modified and configured. For example, the protruding portion 41 described in the first embodiment can be provided in the first covering portions 304 and 404 described in the fourth embodiment and the fifth embodiment. Further, the straightening portion 36 and the filling portion 42 described in the first embodiment are replaced with the first stopper portion 302 and the first covering portion 304 described in the fourth embodiment, and the first embodiment described in the fifth embodiment. The stopper portion 402 and the first covering portion 404 can be provided. Further, the engaging portions 102 and 202 described in the second embodiment and the third embodiment can be provided in the first stopper portions 302 and 402 described in the fourth embodiment and the fifth embodiment. .

上記各実施の形態では、防振装置１，１０１，２０１，３０１，４０１を自動車のエンジンマウントに適用する場合について説明したが、必ずしもこれに限られるのではなく、振動伝達を抑えつつ相対変位を規制することが要求される各種用途に適用される。このような用途としては、例えば、自動車のサスペンションブッシュが挙げられる。また、この防振装置１，１０１，２０１，３０１，４０１の２つをロッドで連結したトルクロッドに適用することは当然可能である。なお、自動車向けの用途だけでなく、各種産業機械等に適用することは当然可能である。 In each of the above-described embodiments, the case where the vibration isolator 1, 101, 201, 301, 401 is applied to the engine mount of an automobile has been described. However, the present invention is not necessarily limited to this, and relative displacement is suppressed while suppressing vibration transmission. Applies to various uses that require regulation. Examples of such applications include automobile suspension bushes. Further, it is naturally possible to apply the anti-vibration device 1, 101, 201, 301, 401 to a torque rod in which two rods are connected by a rod. Note that it is naturally possible to apply not only for automobiles but also to various industrial machines.

上記各実施の形態では、第１ストッパ部３３，３０２，４０２及び第２ストッパ部３７，４０５が第２部材２０に設けられる場合について説明したが、必ずしもこれに限られるものではなく、第１部材１０に第１ストッパ部３３，３０２，４０２及び第２ストッパ部３７，４０５を設けることは当然可能である。 In each of the above-described embodiments, the case where the first stopper portions 33, 302, 402 and the second stopper portions 37, 405 are provided on the second member 20 has been described. It is naturally possible to provide the first stopper portions 33, 302, 402 and the second stopper portions 37, 405 in 10.

上記各実施の形態では、第１部材１０の外周面１１に加硫接着されたゴム膜状の内側膜部３１の一部を当接部３１ａ，３１ｂとする場合について説明したが、必ずしも当接部にゴム膜は必要ではない。当接部は、第１部材１０や第２部材２０の表面であっても良い。 In each of the above embodiments, the case where the rubber film-like inner film part 31 vulcanized and bonded to the outer peripheral surface 11 of the first member 10 is used as the contact parts 31a and 31b has been described. A rubber film is not necessary for the part. The contact portion may be the surface of the first member 10 or the second member 20.

上記各実施の形態では、第２部材２０の中間筒２２を外筒２１に圧入する場合について説明したが、必ずしもこれに限られるものではない。例えば、中間筒２２の外径より内径の大きい外筒２１を中間筒２２に被せ、径方向に外筒２１を圧縮して中間筒２２の外周面を圧接することで、外筒２１を中間筒２２に固定することは当然可能である。 In each of the above embodiments, the case where the intermediate cylinder 22 of the second member 20 is press-fitted into the outer cylinder 21 has been described, but the present invention is not necessarily limited thereto. For example, the outer cylinder 21 having an inner diameter larger than the outer diameter of the intermediate cylinder 22 is placed on the intermediate cylinder 22, the outer cylinder 21 is compressed in the radial direction, and the outer peripheral surface of the intermediate cylinder 22 is pressed into contact with the outer cylinder 21. It is naturally possible to fix to 22.

上記各実施の形態では、第１部材１０及び第２部材２０の軸直角方向の相対移動を規制する第１ストッパ部３３，３０２，４０２（ストッパ部）が設けられる場合について説明したが、必ずしもこれに限られるものではない。ストッパ部によって第１部材および第２部材の軸方向の相対移動を規制する防振装置に、ゴム状弾性体から構成される被覆部を設け、ストッパ部を被覆部で被覆することは当然可能である。 In each of the above-described embodiments, the case where the first stopper portions 33, 302, and 402 (stopper portions) that restrict the relative movement of the first member 10 and the second member 20 in the direction perpendicular to the axis has been described. It is not limited to. Of course, it is possible to provide a vibration-proof device that restricts the relative movement of the first member and the second member in the axial direction by the stopper portion by providing a covering portion made of a rubber-like elastic body and covering the stopper portion with the covering portion. is there.

上記第１実施の形態から第３実施の形態では、第１被覆部４０及び第２被覆部５０が自己潤滑性を有するゴム状弾性体から構成される場合について説明した。しかし、必ずしもこれに限られるものではなく、第１被覆部４０及び第２被覆部５０を、自己潤滑性を有するゴム状弾性体以外の他のゴム状弾性体により形成することは当然可能である。 In the first to third embodiments, the case where the first covering portion 40 and the second covering portion 50 are made of a rubber-like elastic body having self-lubricating properties has been described. However, the present invention is not necessarily limited to this, and it is naturally possible to form the first covering portion 40 and the second covering portion 50 by a rubber-like elastic body other than the rubber-like elastic body having self-lubricating properties. .

１，１０１，２０１，３０１，４０１防振装置
１０第１部材
２０第２部材
３０防振基体
３１ａ，３１ｂ当接部
３３，３０２，４０２第１ストッパ部（ストッパ部）
３６すぐり部
３７，４０５第２ストッパ部（ストッパ部）
４０，３０４，４０４第１被覆部（被覆部）
３０３，４０３凸部
４２充填部
５０，４０６第２被覆部（被覆部）
１０２，２０２係合部 1, 101, 201, 301, 401 Anti-vibration device 10 First member 20 Second member 30 Anti-vibration base 31a, 31b Abutting portion 33, 302, 402 First stopper portion (stopper portion)
36 Straightening part 37,405 Second stopper part (stopper part)
40, 304, 404 First covering part (covering part)
303,403 Convex part 42 Filling part 50,406 Second covering part (covering part)
102,202 engaging portion

Claims

A first member attached to one of the support side or the vibration source side, a second member having a facing surface facing the first member and attached to the other of the support side or the vibration source side, and a rubber-like elastic body And a vibration isolator including a vibration isolator base connecting the first member and the second member,
A stopper formed of a rubber-like elastic body and formed on one of the first member or the second member;
A covering portion that covers the stopper portion and is made of a rubber-like elastic body;
The stopper portion has a Young's modulus set to a value different from the Young's modulus of the covering portion, and from one of the first member or the second member toward the other of the first member or the second member. Protrusively regulates relative displacement of a predetermined amount or more between the first member and the second member by interfering with a contact portion formed on the other of the first member or the second member together with the covering portion. The vibration isolator characterized by carrying out.

The contact portion is formed integrally with the vibration isolating base by a rubber-like elastic body constituting the vibration isolating base and covers the other of the first member or the second member,
2. The vibration isolator according to claim 1, wherein the rubber-like elastic body constituting the contact portion is made of a different material from the rubber-like elastic body constituting the covering portion.

The stopper portion is formed integrally with the vibration isolating base by a rubber-like elastic body constituting the vibration isolating base,
The anti-vibration device according to claim 1 or 2, wherein the stopper portion and the anti-vibration base have a dynamic spring constant set to a value smaller than a dynamic spring constant of the covering portion.

The stopper portion includes a convex portion projecting toward the contact portion,
The vibration isolator according to any one of claims 1 to 3, wherein the convex portion is covered with the covering portion.

The stopper portion includes an engaging portion that is protruded or recessed on an axial end surface,
The vibration isolator according to any one of claims 1 to 4, wherein the engaging portion is covered with the covering portion.

A straight portion that passes through the stopper portion and opens at an end surface of the stopper portion;
The vibration isolator according to any one of claims 1 to 5, further comprising a filling portion that is filled in the straight portion and is formed integrally with the covering portion.