JP4695584B2 - Vibration isolator - Google Patents

Vibration isolator Download PDF

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JP4695584B2
JP4695584B2 JP2006337062A JP2006337062A JP4695584B2 JP 4695584 B2 JP4695584 B2 JP 4695584B2 JP 2006337062 A JP2006337062 A JP 2006337062A JP 2006337062 A JP2006337062 A JP 2006337062A JP 4695584 B2 JP4695584 B2 JP 4695584B2
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inner cylinder
cavity
stopper rubber
rubber
small cavity
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JP2008151173A (en
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俊介 酒井
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Toyo Tire Corp
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Toyo Tire and Rubber Co Ltd
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Description

本発明は、主として自動車のエンジンマウントやサスペンションブッシュ等として使用される防振装置に関する。   The present invention relates to a vibration isolator mainly used as an engine mount, a suspension bush or the like of an automobile.

図４は、自動車のエンジンマウントやサスペンションブッシュ等に用いられる防振装置の従来例を示す断面図である。この防振装置９は、内筒９１と、内筒９１を軸平行に取り囲む外筒９２と、それらを連結するゴム状弾性体９３とを備える。内筒９１は、例えば軸部材を介してコの字状の支持部材に固定され、車体側に取り付けられる。一方、外筒９２は、例えばブラケットの取付孔に圧入されてエンジン等の振動源側に取り付けられる。   FIG. 4 is a cross-sectional view showing a conventional example of a vibration isolator used for an engine mount, a suspension bush or the like of an automobile. The vibration isolator 9 includes an inner cylinder 91, an outer cylinder 92 that surrounds the inner cylinder 91 in an axis-parallel manner, and a rubber-like elastic body 93 that connects them. The inner cylinder 91 is fixed to a U-shaped support member via a shaft member, for example, and is attached to the vehicle body side. On the other hand, the outer cylinder 92 is, for example, press-fitted into an attachment hole of a bracket and attached to a vibration source side such as an engine.

内筒９１を挟んだ上下には、軸方向に延びる一対の空洞部９４、９５が設けられている。そのうち下側の空洞部９５には、外筒９２側から内筒９１側に向かうストッパゴム９６が突設されている。ストッパゴム９６は、標準荷重下にて空洞部９５の内面９５ａ上部に当接する先端部を備えており、このストッパゴム９６にて上下方向の分担荷重を受けることができる。なお、「標準荷重下」は、車両に組み付けられてエンジン等の荷重を受けた静置状態を意味する。   A pair of hollow portions 94 and 95 extending in the axial direction are provided above and below the inner cylinder 91. Among them, a stopper rubber 96 protruding from the outer cylinder 92 side to the inner cylinder 91 side is projected in the lower cavity portion 95. The stopper rubber 96 is provided with a tip portion that comes into contact with the upper portion of the inner surface 95a of the hollow portion 95 under a standard load, and the stopper rubber 96 can receive a shared load in the vertical direction. “Under standard load” means a stationary state that is assembled to a vehicle and receives a load of an engine or the like.

ところが、ストッパゴム９６の先端部が、標準荷重下にて空洞部９５の内面９５ａ上部に当接することにより、上下方向の動バネ定数が高くなるため、比較的振幅が小さい振動に対する防振特性が不十分になるおそれがある。これに対し、ストッパゴム９６の幅寸法を小さくして動バネ定数を低減することも考えられるが、標準荷重下での内筒９１の位置が変化したり、比較的振幅が大きい振動に対する変位規制が不十分になって、ゴム状弾性体９３の耐久性が低下したりするおそれがある。   However, since the top end portion of the stopper rubber 96 comes into contact with the upper portion of the inner surface 95a of the cavity portion 95 under a standard load, the vertical spring constant increases, so that vibration-proof characteristics against vibration with relatively small amplitude are obtained. May be insufficient. On the other hand, it is conceivable to reduce the dynamic spring constant by reducing the width dimension of the stopper rubber 96. However, the displacement of the inner cylinder 91 under a standard load is changed, or the displacement is restricted to vibration with a relatively large amplitude. May become insufficient, and the durability of the rubber-like elastic body 93 may be reduced.

そこで、下記特許文献１、２では、ストッパゴムの内部に、軸方向に延びる小空洞を設けることが提案されている。この小空洞の存在によって、ストッパゴムが弾性変形し易くなり、上下方向の動バネ定数を低下させることができる。しかも、所定以上の振動入力時には小空洞が撓んで潰れ、その内壁面同士が密着することにより、上下方向の変位を規制して、良好なストッパ作用を果たすことができる。しかしながら、かかる防振装置では、小空洞の内壁面同士が密着した後、それらが離反する動作に起因して異音が発生することが判明した。
特開２００５−１７２２４２号公報 特開２００５−１８０７０４号公報 Therefore, in the following Patent Documents 1 and 2, it is proposed to provide a small cavity extending in the axial direction inside the stopper rubber. Due to the presence of this small cavity, the stopper rubber is easily elastically deformed, and the dynamic spring constant in the vertical direction can be reduced. Moreover, when a vibration exceeding a predetermined value is input, the small cavity is bent and crushed, and the inner wall surfaces thereof are brought into close contact with each other, whereby the vertical displacement can be restricted and a good stopper action can be achieved. However, in such a vibration isolator, it has been found that after the inner wall surfaces of the small cavities are brought into close contact with each other, abnormal noise is generated due to an operation of separating them.
JP 2005-172242 A JP 2005-180704 A

本発明は上記実情に鑑みてなされたものであり、その目的は、ストッパゴムに設けた小空洞より発生する異音を防止することができる防振装置を提供することにある。   The present invention has been made in view of the above circumstances, and an object thereof is to provide a vibration isolator capable of preventing noise generated from a small cavity provided in a stopper rubber.

上記目的は、下記の如き本発明により達成することができる。即ち、本発明に係る防振装置は、内筒と、前記内筒を軸平行に取り囲む外筒と、前記内筒と前記外筒とを連結するゴム状弾性体と、前記内筒と前記外筒との間にて軸方向に延びる空洞部と、前記空洞部内にて前記外筒側から前記内筒側に向かって突設されたストッパゴムとを備える防振装置において、前記ストッパゴムが、前記ストッパゴムの内部で軸方向に延びる断面円形の小空洞と、前記小空洞の内壁面に突設され、振動入力によって潰れた前記小空洞の内壁面同士が離反する際の異音を防止する突起部とを有するものである。 The above object can be achieved by the present invention as described below. That is, the vibration isolator according to the present invention includes an inner cylinder, an outer cylinder that surrounds the inner cylinder in an axially parallel manner, a rubber-like elastic body that connects the inner cylinder and the outer cylinder, the inner cylinder, and the outer cylinder. In the vibration isolator comprising a hollow portion extending in the axial direction between the tube and a stopper rubber projecting from the outer tube side toward the inner tube side in the hollow portion, the stopper rubber includes: A small cavity having a circular cross-section extending in the axial direction inside the stopper rubber and an inner wall surface of the small cavity are protruded to prevent abnormal noise when the inner wall surfaces of the small cavity are crushed by vibration input. It has a projection part.

本発明に係る防振装置では、小空洞の内壁面に突起部が設けられていることにより、所定以上の振動が入力されて小空洞が撓んで潰れる際には、突起部の凸面を起点として小空洞の内壁面同士が密着を開始するため、その密着の度合いが緩和される。また、密着した小空洞の内壁面同士が離反する際には、突起部の凸面が離反の終点となるため、内壁面同士が一気に離反することを防ぐことができる。その結果、小空洞の内壁面同士が離反する動作に起因した異音の発生を防止することができる。   In the vibration isolator according to the present invention, since the protrusion is provided on the inner wall surface of the small cavity, when the vibration more than a predetermined value is input and the small cavity is bent and crushed, the convex surface of the protrusion is used as a starting point. Since the inner wall surfaces of the small cavities start to contact each other, the degree of the contact is reduced. In addition, when the inner wall surfaces of the closely spaced small cavities are separated from each other, the convex surface of the projection becomes the end point of separation, so that the inner wall surfaces can be prevented from separating at a stretch. As a result, it is possible to prevent the generation of abnormal noise caused by the movement of the inner wall surfaces of the small cavities apart.

本発明に係る防振装置では、また、前記内筒を挟んで上下に設けられている一対の前記空洞部のうち、前記内筒の下方の前記空洞部内に前記ストッパゴムが設けられていると共に、前記小空洞の下側内壁面の中心に前記突起部が設けられている。 In the vibration isolator according to the present invention, the stopper rubber is provided in the hollow portion below the inner cylinder among the pair of hollow sections provided above and below the inner cylinder. The protrusion is provided at the center of the lower inner wall surface of the small cavity .

上記構成によれば、内筒の下方の空洞部内に設けられたストッパゴムの先端部が、標準荷重下にて該空洞部の内面上部に当接した場合に、ストッパゴムによって分担荷重を受けることができる。そして、そのストッパゴムの小空洞の下側内壁面の中心に突起部が設けられていることにより、上述した異音防止効果を発揮しつつ、分担荷重を受けるストッパゴムの防振特性への突起部の影響を極力低減することができる。   According to the above configuration, when the tip of the stopper rubber provided in the cavity below the inner cylinder comes into contact with the upper part of the inner surface of the cavity under a standard load, the stopper rubber receives a shared load. Can do. And, by providing a protrusion at the center of the lower inner wall surface of the small cavity of the stopper rubber, the protrusion to the anti-vibration characteristics of the stopper rubber that receives the shared load while exhibiting the above-mentioned noise prevention effect The influence of the part can be reduced as much as possible.

上記において、前記突起部の凸面が円弧状に形成されているものが好ましい。かかる構成によれば、突起部の凸面が円弧状に形成されていることにより、突起部と小空洞の内壁面との面接触を抑制できるため、上述した異音防止効果を良好に高めることができる。   In the above, it is preferable that the convex surface of the protrusion is formed in an arc shape. According to such a configuration, since the convex surface of the projecting portion is formed in an arc shape, surface contact between the projecting portion and the inner wall surface of the small cavity can be suppressed. it can.

以下、本発明の実施の形態について図面を参照しながら説明する。図１は、本発明に係る防振装置の一例を示す正面図である。図２は、その防振装置を軸方向に沿って切断したときの要部断面図であり、図１のＡ−Ａ矢視断面に相当する。図１、２は、いずれも車両に組み付ける前の無荷重状態を示している。図３は、その防振装置の標準荷重下における正面図である。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a front view showing an example of a vibration isolator according to the present invention. FIG. 2 is a cross-sectional view of the main part when the vibration isolator is cut along the axial direction, and corresponds to a cross section taken along the line AA in FIG. 1 and 2 both show a no-load state before being assembled to a vehicle. FIG. 3 is a front view of the vibration isolator under a standard load.

この防振装置１０は、自動車の車体側部材からエンジンを吊り下げ支持するための防振マウントとして用いられ、図１の左右方向が横方向、軸方向ＡＤが前後方向となるように組み付けられる。防振装置１０は、車体側に取り付けられる内筒１と、その内筒１を軸平行に取り囲んでエンジン側に取り付けられる外筒２と、内筒１と外筒２との間に介在して両者を一体的に連結するゴム状弾性体３とを備える。   This anti-vibration device 10 is used as an anti-vibration mount for suspending and supporting an engine from a vehicle body side member of an automobile, and is assembled so that the horizontal direction in FIG. 1 is a horizontal direction and the axial direction AD is a front-rear direction. The vibration isolator 10 is interposed between the inner cylinder 1 attached to the vehicle body side, the outer cylinder 2 surrounding the inner cylinder 1 in an axially parallel manner and attached to the engine side, and the inner cylinder 1 and the outer cylinder 2. And a rubber-like elastic body 3 integrally connecting the two.

内筒１及び外筒２は、金属材料や高剛性樹脂材料など公知の高剛性材料にて形成することができる。また、ゴム状弾性体３としては、自動車用防振ゴムの技術分野における公知のゴム材料を特に限定なく使用することができる。   The inner cylinder 1 and the outer cylinder 2 can be formed of a known high-rigidity material such as a metal material or a high-rigidity resin material. Moreover, as the rubber-like elastic body 3, a known rubber material in the technical field of automobile vibration-proof rubber can be used without any particular limitation.

内筒１は、外筒２よりも厚肉に形成されており、円柱状の軸部材を挿通するための挿通孔１１を有している。内筒１は、その軸部材を介してコの字状の支持部材に固定され、車体側に取り付けられる。外筒２は、エンジンを吊り下げ支持するためのブラケットの取付孔に圧入される。本実施形態では、内筒１を左右から充分な量のゴム状弾性体３により支持して防振特性の安定性を高めるべく、外筒２が横長の楕円形状に形成されている。   The inner cylinder 1 is formed thicker than the outer cylinder 2 and has an insertion hole 11 for inserting a columnar shaft member. The inner cylinder 1 is fixed to a U-shaped support member via the shaft member, and is attached to the vehicle body side. The outer cylinder 2 is press-fitted into a mounting hole of a bracket for hanging and supporting the engine. In the present embodiment, the outer cylinder 2 is formed in a horizontally long oval shape so that the inner cylinder 1 is supported by a sufficient amount of the rubber-like elastic body 3 from the left and right sides to increase the stability of the vibration isolation characteristics.

防振装置１０は、内筒１と外筒２との間にて軸方向ＡＤに延びるとともに、内筒１を挟んで上下に設けられた一対の空洞部４、５を備えており、ゴム状弾性体３の支持腕部３１、３２が内筒１を左右両側から支持した状態になっている。車両に組み付ける前の無荷重状態では、図１に示すように内筒１が外筒２に対して上方に偏心して配置されており、空洞部４、５は、軸方向ＡＤから見て上凸に湾曲する弓状をなしつつ両端で幅広になっている。   The vibration isolator 10 extends in the axial direction AD between the inner cylinder 1 and the outer cylinder 2, and includes a pair of hollow portions 4 and 5 provided above and below the inner cylinder 1. The support arm portions 31 and 32 of the elastic body 3 support the inner cylinder 1 from both the left and right sides. In the no-load state before being assembled to the vehicle, as shown in FIG. 1, the inner cylinder 1 is arranged eccentrically upward with respect to the outer cylinder 2, and the cavities 4, 5 are convex upward when viewed from the axial direction AD. It is wide at both ends while forming an arcuate curve.

一対の空洞部４、５のうち内筒１の下方の空洞部５内には、ストッパゴム６が突設されている。ストッパゴム６は、外筒２側から内筒１側に向かって、即ち空洞部５の内面５ａ下部から上方に向かって突出しており、ゴム状弾性体３と一体的に成形されている。ストッパゴム６は、軸方向ＡＤ及び横方向から見て、下広がりの台形状をなしており、その上端に略平坦な先端部６１を有している。この先端部６１は、無荷重状態において空洞部５の内面５ａから離れている。   A stopper rubber 6 projects from the pair of cavities 4 and 5 in the cavity 5 below the inner cylinder 1. The stopper rubber 6 protrudes from the outer cylinder 2 side toward the inner cylinder 1 side, that is, upward from the lower portion of the inner surface 5 a of the cavity 5, and is molded integrally with the rubber-like elastic body 3. The stopper rubber 6 has a trapezoidal shape spreading downward when viewed from the axial direction AD and the lateral direction, and has a substantially flat tip portion 61 at the upper end thereof. The tip 61 is separated from the inner surface 5a of the cavity 5 in a no-load state.

図３に示す標準荷重下では、先端部６１が空洞部５の内面５ａ上部に突き当てられるようにして当接し、ストッパゴム６がエンジンの分担荷重を受ける。したがって、内筒１は、ゴム状弾性体３の支持腕部３１、３２により左右両側から支持されるとともに、標準荷重下においてはストッパゴム６によって下方から支持される。なお、標準荷重下では、内筒１が外筒２の略中心に配置されることが好ましい。   Under the standard load shown in FIG. 3, the front end portion 61 comes into contact with the upper portion of the inner surface 5 a of the cavity portion 5, and the stopper rubber 6 receives a shared load of the engine. Accordingly, the inner cylinder 1 is supported from both the left and right sides by the support arm portions 31 and 32 of the rubber-like elastic body 3, and is supported from below by the stopper rubber 6 under a standard load. In addition, it is preferable that the inner cylinder 1 is arrange | positioned in the approximate center of the outer cylinder 2 under standard load.

ストッパゴム６の根元付近には、小空洞７が左右対称に２つ設けられており、どちらも図２に示すようにストッパゴム６を軸方向ＡＤに貫通している。空洞部４、５及び小空洞７は、ゴム状弾性体３を加硫成形する際に、空洞部４、５及び小空洞７に対応した中子を成形型内に配設しておくことで容易に成形できるものであるが、加硫成形後のゴム状弾性体３にくり抜き加工を施すことで成形しても構わない。なお、本実施形態では、小空洞７の内径が軸方向中央部に向かって徐々に小さくなっているため、ゴム状弾性体３を加硫成形した後の上記中子の抜け性が確保される。   Two small cavities 7 are provided in the vicinity of the base of the stopper rubber 6 symmetrically, both of which penetrate the stopper rubber 6 in the axial direction AD as shown in FIG. When the rubber-like elastic body 3 is vulcanized and molded, the cavities 4 and 5 and the small cavity 7 are formed by arranging cores corresponding to the cavities 4 and 5 and the small cavity 7 in the mold. Although it can be easily molded, the rubber-like elastic body 3 after vulcanization molding may be molded by cutting. In the present embodiment, since the inner diameter of the small cavity 7 is gradually reduced toward the central portion in the axial direction, the above-described core can be easily pulled out after the rubber-like elastic body 3 is vulcanized. .

このような小空洞７がストッパゴム６の内部に設けられていることにより、ストッパゴム６が弾性変形し易くなるため、標準荷重下における上下方向の動バネ定数が好適に低減されたものとなり、小振幅の振動に対する防振特性を向上することができる。しかも、この小空洞７は所定以上の振動入力時に撓んで潰れるため、車両の急発進や急ブレーキなどに起因した大振動が入力された場合には、小空洞７の内壁面同士が密着し、上下方向の大変形を規制して良好なストッパ作用を果たすことができる。   By providing such a small cavity 7 inside the stopper rubber 6, the stopper rubber 6 is easily elastically deformed, and therefore, the dynamic spring constant in the vertical direction under a standard load is suitably reduced. Anti-vibration characteristics against small amplitude vibrations can be improved. Moreover, since the small cavity 7 is bent and crushed when a predetermined vibration or more is input, when a large vibration due to a sudden start or sudden braking of the vehicle is input, the inner wall surfaces of the small cavity 7 are in close contact with each other, A large stopper in the vertical direction can be restricted to achieve a good stopper action.

小空洞７には、その下側内壁面７ｂから上方に向かって突出した突起部８が設けられている。突起部８は、凸面８ａが円弧状をなす断面半円状に形成されており、図２に示すように軸方向ＡＤに延設されている。なお、本実施形態は、既述のように小空洞７の内径が軸方向ＡＤに沿って変化するものであるが、突起部８の突出高さは成形性の観点から一定にしている。   The small cavity 7 is provided with a protruding portion 8 protruding upward from the lower inner wall surface 7b. The protrusion 8 is formed in a semicircular cross section in which the convex surface 8a forms an arc shape, and extends in the axial direction AD as shown in FIG. In the present embodiment, as described above, the inner diameter of the small cavity 7 changes along the axial direction AD, but the protrusion height of the protrusion 8 is constant from the viewpoint of formability.

突起部８の凸面８ａは、図３に示すように標準荷重下では小空洞７の上側内壁面７ａから離れており、それ故に上述した小空洞７を設けたことによる改善効果を確保できる。そして、大振動が入力されて小空洞７が撓んで潰れた際には、小空洞７の内壁面同士が凸面８ａを起点として密着を開始するため、その密着の度合いを緩和することができる。更に、密着した小空洞７の内壁面同士が離反する際には、凸面８ａが離反の終点となるため、内壁面同士が一気に離反することを防ぐことができる。その結果、ストッパゴム６に小空洞７に設けたことによる改善効果を損なうことなく、小空洞７の内壁面同士が離反する際の異音の発生を防止することができる。   As shown in FIG. 3, the convex surface 8a of the protruding portion 8 is separated from the upper inner wall surface 7a of the small cavity 7 under the standard load. Therefore, the improvement effect due to the provision of the small cavity 7 described above can be secured. When large vibrations are input and the small cavities 7 are bent and crushed, the inner wall surfaces of the small cavities 7 start to contact each other with the convex surface 8a as a starting point, so that the degree of contact can be reduced. Further, when the inner wall surfaces of the closely attached small cavities 7 are separated from each other, the convex surface 8a serves as an end point of separation, so that the inner wall surfaces can be prevented from separating at a stretch. As a result, it is possible to prevent the generation of noise when the inner wall surfaces of the small cavities 7 are separated from each other without impairing the improvement effect due to the provision of the stopper rubber 6 in the small cavities 7.

本実施形態では、突起部８が小空洞７の下側内壁面７ｂの中心（下側円弧の中心）に設けられている。上記の異音防止効果は、突起部８を小空洞７の上側内壁面７ａに設けた場合においても同様に得られるものであるが、突起部８を下側内壁面７ｂの中心に設けることで、エンジンの分担荷重を受けるストッパゴム６の防振特性への影響を極力低減することができる。   In this embodiment, the protrusion 8 is provided at the center of the lower inner wall surface 7b of the small cavity 7 (the center of the lower arc). The above noise prevention effect can be obtained in the same manner when the protrusion 8 is provided on the upper inner wall surface 7a of the small cavity 7, but by providing the protrusion 8 at the center of the lower inner wall surface 7b. Further, the influence on the vibration isolation characteristics of the stopper rubber 6 that receives the shared load of the engine can be reduced as much as possible.

本発明では、突起部８の凸面８ａが矩形状や台形状に形成されているものでも構わないが、本実施形態のように円弧状に形成されていることが好ましく、これにより突起部８と小空洞７の内壁面との面接触を効果的に抑制して、上述した異音防止効果をより良好に発揮することができる。なお、突起部８は軸方向ＡＤに不連続であっても構わないが、本実施形態のように軸方向ＡＤに延在することが、異音防止効果を確保するうえで好ましい。   In the present invention, the convex surface 8a of the protruding portion 8 may be formed in a rectangular shape or a trapezoidal shape, but is preferably formed in an arc shape as in the present embodiment. The surface contact with the inner wall surface of the small cavity 7 can be effectively suppressed, and the above-described noise prevention effect can be more effectively exhibited. In addition, although the protrusion part 8 may be discontinuous in the axial direction AD, it is preferable in order to ensure the noise prevention effect that it extends in the axial direction AD like this embodiment.

［別実施形態］
（１）本発明では、前述の実施形態のように小空洞が断面円形であるので、小空洞の内壁面同士がより密着し易くなるため、異音の発生を効果的に防止できる本発明が特に有用となる。 [Another embodiment]
(1) In the present invention, since the small cavity as in the previous embodiment is a circular cross section, it becomes easier to contact the inner wall surfaces of the small cavities, the present invention can effectively prevent the occurrence of abnormal noise Especially useful.

（２）前述の実施形態では、ストッパゴムが台形状をなす例を示したが、本発明はこれに限られず他の異なる形状でも構わない。但し、前述の実施形態のようにストッパゴムが軸方向から見て台形状をなす場合には、圧縮されたゴムが横方向に逃げ難く、小空洞の内壁面同士がより密着し易くなるため、異音の発生を効果的に防止できる本発明が特に有用となる。   (2) In the above-described embodiment, an example in which the stopper rubber has a trapezoidal shape has been shown. However, the present invention is not limited to this and may have other different shapes. However, when the stopper rubber has a trapezoidal shape when viewed from the axial direction as in the above-described embodiment, the compressed rubber is difficult to escape in the lateral direction, and the inner wall surfaces of the small cavities are more likely to be in close contact with each other. The present invention that can effectively prevent the generation of abnormal noise is particularly useful.

（３）前述の実施形態では、ストッパゴムに２つの小空洞を設けた例を示したが、本発明はこれに限られるものではない。また、小空洞は、軸方向に内径が均一であってもよく、また途中で塞がれているものでも構わない。但し、前述の実施形態のように小空洞が貫通している場合には、小空洞の内壁面同士がより密着し易くなるため、異音の発生を効果的に防止できる本発明が特に有用となる。   (3) In the above-described embodiment, an example in which two small cavities are provided in the stopper rubber is shown, but the present invention is not limited to this. The small cavity may have a uniform inner diameter in the axial direction, or may be closed in the middle. However, when the small cavities are penetrating as in the above-described embodiment, the inner wall surfaces of the small cavities are more easily adhered to each other, and therefore the present invention that can effectively prevent the generation of abnormal noise is particularly useful. Become.

本発明に係る防振装置の一例を示す正面図The front view which shows an example of the vibration isolator which concerns on this invention 防振装置を軸方向に沿って切断したときの要部断面図Cross section of the main part when the vibration isolator is cut along the axial direction 防振装置の標準荷重下における正面図Front view of the vibration isolator under standard load 従来の防振装置の一例を示す断面図Sectional drawing which shows an example of the conventional vibration isolator

符号の説明Explanation of symbols

１ 内筒
２ 外筒
３ ゴム状弾性体
４ 空洞部
５ 空洞部
５ａ 空洞部の内面
６ ストッパゴム
７ 小空洞
７ａ 小空洞の内壁面
７ｂ 小空洞の内壁面
８ 突起部
８ａ 凸面
１０ 防振装置
６１ 先端部
ＡＤ 軸方向 DESCRIPTION OF SYMBOLS 1 Inner cylinder 2 Outer cylinder 3 Rubber-like elastic body 4 Cavity part 5 Cavity part 5a Cavity part inner surface 6 Stopper rubber 7 Cavity 7a Small cavity inner wall surface 7b Small cavity inner wall surface 8 Projection part 8a Convex surface 10 Vibration isolator 61 Tip AD Axial direction

Claims (2)

内筒と、前記内筒を軸平行に取り囲む外筒と、前記内筒と前記外筒とを連結するゴム状弾性体と、前記内筒と前記外筒との間にて軸方向に延びる空洞部と、前記空洞部内にて前記外筒側から前記内筒側に向かって突設されたストッパゴムとを備える防振装置において、
前記ストッパゴムが、前記ストッパゴムの内部で軸方向に延びる断面円形の小空洞と、前記小空洞の内壁面に突設され、振動入力によって潰れた前記小空洞の内壁面同士が離反する際の異音を防止する突起部とを有し、
前記内筒を挟んで上下に設けられている一対の前記空洞部のうち、前記内筒の下方の前記空洞部内に前記ストッパゴムが設けられていると共に、前記小空洞の下側内壁面の中心に前記突起部が設けられた
ことを特徴とする防振装置。 An inner cylinder, an outer cylinder surrounding the inner cylinder in parallel with the inner cylinder, a rubber-like elastic body connecting the inner cylinder and the outer cylinder, and a cavity extending in the axial direction between the inner cylinder and the outer cylinder An anti-vibration device comprising: a portion and a stopper rubber projecting from the outer cylinder side toward the inner cylinder side in the hollow portion;
When the stopper rubber protrudes from the small cavity having a circular cross section extending in the axial direction inside the stopper rubber and the inner wall surface of the small cavity, and the inner wall surfaces of the small cavity that are crushed by vibration input are separated from each other possess a protrusion for preventing abnormal noise,
Of the pair of cavities provided above and below the inner cylinder, the stopper rubber is provided in the cavity below the inner cylinder and the center of the lower inner wall surface of the small cavity An anti-vibration device according to claim 1, wherein the protrusion is provided . 前記突起部の凸面が円弧状に形成されている請求項１に記載の防振装置。 The vibration isolator according to claim 1 , wherein the convex surface of the protrusion is formed in an arc shape.
JP2006337062A 2006-12-14 2006-12-14 Vibration isolator Expired - Fee Related JP4695584B2 (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5967646U (en) * 1982-10-28 1984-05-08 トヨタ自動車株式会社 Nonlinear spring characteristic bush
JPS60125430A (en) * 1983-12-09 1985-07-04 Kinugawa Rubber Ind Co Ltd Bush for engine mound
JPH10274267A (en) * 1997-03-28 1998-10-13 Bridgestone Corp Vibration control device
JP2004205049A (en) * 2004-04-09 2004-07-22 Toyo Tire & Rubber Co Ltd Vibration isolating bush
JP2005180704A (en) * 2000-09-20 2005-07-07 Toyo Tire & Rubber Co Ltd Vibration isolating device
JP2006194330A (en) * 2005-01-12 2006-07-27 Toyo Tire & Rubber Co Ltd Vibration damper

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5967646U (en) * 1982-10-28 1984-05-08 トヨタ自動車株式会社 Nonlinear spring characteristic bush
JPS60125430A (en) * 1983-12-09 1985-07-04 Kinugawa Rubber Ind Co Ltd Bush for engine mound
JPH10274267A (en) * 1997-03-28 1998-10-13 Bridgestone Corp Vibration control device
JP2005180704A (en) * 2000-09-20 2005-07-07 Toyo Tire & Rubber Co Ltd Vibration isolating device
JP2004205049A (en) * 2004-04-09 2004-07-22 Toyo Tire & Rubber Co Ltd Vibration isolating bush
JP2006194330A (en) * 2005-01-12 2006-07-27 Toyo Tire & Rubber Co Ltd Vibration damper

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