JP2021092297A - Vibration isolating device - Google Patents

Vibration isolating device Download PDF

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JP2021092297A
JP2021092297A JP2019224568A JP2019224568A JP2021092297A JP 2021092297 A JP2021092297 A JP 2021092297A JP 2019224568 A JP2019224568 A JP 2019224568A JP 2019224568 A JP2019224568 A JP 2019224568A JP 2021092297 A JP2021092297 A JP 2021092297A
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outer cylinder
resin
cylinder
peripheral surface
press
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佐藤 俊治
Toshiharu Sato
俊治 佐藤
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Bridgestone Corp
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Bridgestone Corp
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Abstract

To provide a vibration isolating device that can be easily press-fitted into a vehicle fitting member and stably keep a state of being less likely to be dislodged after being press-fitted.SOLUTION: A vibration isolating device includes: an outer cylinder; an inner cylinder disposed on an inner peripheral side of the outer cylinder; and an elastic body elastically connecting the outer cylinder to the inner cylinder. The outer cylinder includes a resin exposed to an outer peripheral surface of the outer cylinder and having stiffness which is smaller than a material forming the other parts of the outer cylinder.SELECTED DRAWING: Figure 3

Description

本発明は、防振装置に関し、特に、圧入しやすく、また圧入した後においても、安定して抜けにくい状態を維持可能な防振装置に関する。 The present invention relates to a vibration isolator, and more particularly to a vibration isolator that is easy to press-fit and can maintain a stable and hard-to-remove state even after press-fitting.

従来、車両におけるボディマウントとして用いられるメンバーマウントやサブフレームブッシュ、サスペンションブッシュ等の防振装置は、内筒と、内筒の外周側に配置される外筒と、内筒及び外筒をゴムなどの弾性体で結合して構成される。そして、防振装置は、例えば、外筒を車体側の部品又は車輪側の部品に圧入し、内筒を他方の部品に固定することで用いられている。このような防振装置には、軽量化を目的として、外筒に樹脂を用いたものが知られている。防振装置の外筒に樹脂を用いた場合、樹脂材料の特性上、経年の使用により圧入後、荷重が付加された状態に加え、高温状態が長時間維持されると、クリープが発生し、圧入による抜け耐力が低下する。このため、外筒の先端をフック形状に形成し、圧入された部品(以下、受け部材という)に貫通させ、この部品に係合可能としたり(特許文献1)、外筒の外周にゴムを接着したり(特許文献2)する等の抜け止めの対策がなされている。 Conventionally, vibration isolation devices such as member mounts, subframe bushes, and suspension bushes used as body mounts in vehicles include an inner cylinder, an outer cylinder arranged on the outer peripheral side of the inner cylinder, and rubber for the inner cylinder and the outer cylinder. It is composed of the elastic bodies of. The anti-vibration device is used, for example, by press-fitting the outer cylinder into a part on the vehicle body side or a part on the wheel side and fixing the inner cylinder to the other part. As such an anti-vibration device, one using a resin for the outer cylinder is known for the purpose of weight reduction. When resin is used for the outer cylinder of the anti-vibration device, due to the characteristics of the resin material, creep occurs when a load is applied after press-fitting due to long-term use and when a high temperature state is maintained for a long time. The pull-out resistance due to press-fitting decreases. For this reason, the tip of the outer cylinder is formed in a hook shape and penetrated into a press-fitted part (hereinafter referred to as a receiving member) so that it can be engaged with this part (Patent Document 1), or rubber is placed on the outer periphery of the outer cylinder. Measures are taken to prevent it from coming off, such as adhering (Patent Document 2).

特開2007−132386号公報Japanese Unexamined Patent Publication No. 2007-132386 WO2004/070229号公報WO2004 / 070229

しかしながら、特許文献1のように、外筒の先端をフック形状にすることにより、受け部材からの脱落防止手段として機能するものの、外筒と受け部材との関係において、受け部材を貫通したフック部分が、受け部材に係合するための隙間が必要となる。
この隙間は、クリープにより抜け耐力が低下した初期の段階において、フックが受け部材に係合するまで受け部材から抜け出す、初期抜け出しを許容してしまう。この初期抜け出しは、受け部材に対する防振装置の位置ズレとなるため、例えば、車両操安性を悪化させる等の問題を誘発する虞がある。さらにクリープによる劣化が進行し、さらに抜け耐力が低下すると、外筒、即ち、防振装置が受け部材に対して抜け出しと戻りが繰り返されることになり、異音を発生させる要因となる。
また、特許文献2に示すように、外筒の外周にゴムを被覆接着して受け部材からの脱落を対策した場合、防振装置を受け部材から抜けにくくすることができるものの、受け部材への圧入時にゴム表面が切れたり、接着面からゴムが切れる等して、圧入力及び抜け耐力が安定しないという問題があった。
そこで、本発明では、防振装置を受け部材に圧入するときに、圧入しやすく、また圧入後も抜けにくい状態を安定して維持可能とする防振装置を提供することを目的とする。
However, as in Patent Document 1, although the tip of the outer cylinder has a hook shape, it functions as a means for preventing the outer cylinder from falling off from the receiving member, but in the relationship between the outer cylinder and the receiving member, the hook portion penetrating the receiving member. However, a gap for engaging with the receiving member is required.
This gap allows the initial withdrawal, in which the hook comes out of the receiving member until the hook engages with the receiving member in the initial stage where the pull-out proof stress is lowered due to creep. Since this initial escape causes a displacement of the vibration isolator with respect to the receiving member, there is a risk of inducing problems such as deterioration of vehicle maneuverability. Further, when deterioration due to creep progresses and the pull-out proof stress further decreases, the outer cylinder, that is, the vibration isolator repeatedly pulls out and returns to the receiving member, which causes an abnormal noise.
Further, as shown in Patent Document 2, when rubber is coated and adhered to the outer periphery of the outer cylinder to prevent the vibration isolator from falling off from the receiving member, the anti-vibration device can be made difficult to come off from the receiving member, but the receiving member is attached. There is a problem that the press-fitting and the pull-out proof stress are not stable because the rubber surface is cut at the time of press-fitting or the rubber is cut from the adhesive surface.
Therefore, an object of the present invention is to provide a vibration isolator capable of stably maintaining a state in which the vibration isolator is easily press-fitted when press-fitted into a member and is difficult to come off even after press-fitting.

上述の課題を解決するための防振装置の構成として、外筒と、外筒の内周側に配置される内筒と、外筒及び内筒を弾性的に結合する弾性体とを備えた防振装置であって、外筒は、該外筒の外周面に露出し、外筒の他部を形成する素材よりも剛性が小さい樹脂を有する構成とした。
本構成によれば、防振装置が圧入される受け部材に対して圧入しやすく、また、圧入後も受け部材から抜けにくい状態を安定して維持することができる。
また、防振装置の他の構成として、外筒の他部は、樹脂と異なる樹脂で形成しても良い。また、外筒は、外周面に半径方向に窪む凹部を有し、外筒の外周面に露出する樹脂が凹部に設けるようにすると良い。また、外筒の外周面に露出する樹脂は、他部を形成する樹脂により形成される外周面よりも半径方向外側に突出させても良い。
As a configuration of the vibration isolator for solving the above-mentioned problems, an outer cylinder, an inner cylinder arranged on the inner peripheral side of the outer cylinder, and an elastic body for elastically connecting the outer cylinder and the inner cylinder are provided. The vibration isolator has a structure in which the outer cylinder is exposed on the outer peripheral surface of the outer cylinder and has a resin having a lower rigidity than the material forming the other part of the outer cylinder.
According to this configuration, the vibration isolator can be easily press-fitted into the receiving member to be press-fitted, and can stably maintain a state in which it is difficult to come off from the receiving member even after press-fitting.
Further, as another configuration of the vibration isolator, the other part of the outer cylinder may be formed of a resin different from the resin. Further, it is preferable that the outer cylinder has a concave portion recessed in the radial direction on the outer peripheral surface, and the resin exposed on the outer peripheral surface of the outer cylinder is provided in the concave portion. Further, the resin exposed on the outer peripheral surface of the outer cylinder may be projected outward in the radial direction from the outer peripheral surface formed by the resin forming the other portion.

なお、上記発明の概要は、本発明の必要な特徴の全てを列挙したものではなく、特徴群を構成する個々の構成もまた発明となり得る。 It should be noted that the outline of the above invention does not list all the necessary features of the present invention, and individual configurations constituting the feature group may also be an invention.

防振装置の組み付け状態を示す断面図である。It is sectional drawing which shows the assembled state of the anti-vibration device. 防振装置の外観斜視図と、軸及び半径方向の断面図である。It is the external perspective view of the anti-vibration device, and the sectional view in the axial and radial directions. 防振装置の他の配置形態を示す図である。It is a figure which shows the other arrangement form of the anti-vibration device. 防振装置の他の配置形態を示す図である。It is a figure which shows the other arrangement form of the anti-vibration device. 防振装置の他の配置形態を示す図である。It is a figure which shows the other arrangement form of the anti-vibration device. 防振装置の他の配置形態を示す図である。It is a figure which shows the other arrangement form of the anti-vibration device.

以下、発明の実施形態を通じて本発明を詳説するが、以下の実施形態は特許請求の範囲に係る発明を限定するものではなく、また実施形態の中で説明される特徴の組み合わせの全てが発明の解決手段に必須であるとは限らない。 Hereinafter, the present invention will be described in detail through embodiments of the invention, but the following embodiments do not limit the invention according to the claims, and all combinations of features described in the embodiments are the inventions. It is not always essential for the solution.

図1は、防振装置の組み付け状態を示す断面図及び部分拡大図である。図2は、防振装置の外観斜視図と、軸方向及び半径方向の断面図である。以下、図1,図2を用いて防振装置1について説明する。なお、図2(b)は、図2(a)において矢視で示す半径方向断面図、図2(c)は、図2(a)において中心軸O1;O2を含む軸方向断面図である。図1に示すように、防振装置1は、内筒10と、内筒10を取り囲んで同心に配された外筒20と、内筒10と外筒20との間に介設されて、両者を結合する弾性体30とを備える。内筒10は、外筒20の内周側に配置され、例えば、軸方向の両端部が外筒20の軸方向の両端部から突出するように軸方向の長さが設定されている。 FIG. 1 is a cross-sectional view and a partially enlarged view showing an assembled state of the vibration isolator. FIG. 2 is an external perspective view of the vibration isolator and a cross-sectional view in the axial and radial directions. Hereinafter, the vibration isolator 1 will be described with reference to FIGS. 1 and 2. 2 (b) is a radial cross-sectional view shown by an arrow in FIG. 2 (a), and FIG. 2 (c) is an axial cross-sectional view including the central axes O1; O2 in FIG. 2 (a). .. As shown in FIG. 1, the vibration isolator 1 is interposed between the inner cylinder 10, the outer cylinder 20 concentrically arranged surrounding the inner cylinder 10, and the inner cylinder 10 and the outer cylinder 20. It includes an elastic body 30 that connects the two. The inner cylinder 10 is arranged on the inner peripheral side of the outer cylinder 20, and for example, the length in the axial direction is set so that both ends in the axial direction protrude from both ends in the axial direction of the outer cylinder 20.

防振装置1は、自動車のサスペンションなどの足回り部材をボディに対して防振的に、弾性支持するためのボディマウントとして機能し、例えば、外筒20を足回り部材とボディのいずれかに設けられた円筒状の受け部材2に圧入され、内筒10の内側にボルトを貫通させて他方に取り付けられる。 The anti-vibration device 1 functions as a body mount for elastically supporting an undercarriage member such as an automobile suspension with respect to the body. For example, the outer cylinder 20 is attached to either the undercarriage member or the body. It is press-fitted into the provided cylindrical receiving member 2, and a bolt is passed through the inside of the inner cylinder 10 to be attached to the other.

図2に示すように、内筒10及び外筒20は、例えば、それぞれを金属や樹脂等の剛体により形成することができる。本実施形態では、内筒10を金属、外筒20を樹脂で形成されたものとして説明する。弾性体30は、所定の弾性を有するゴム等の弾性素材からなり、外筒20の筒部22の内周面22iと、内筒10の外周面10oとを、例えば、加硫接着により一体化することにより内筒10と外筒20とを弾性的に結合する。 As shown in FIG. 2, the inner cylinder 10 and the outer cylinder 20 can be each formed of, for example, a rigid body made of metal, resin, or the like. In the present embodiment, it is assumed that the inner cylinder 10 is made of metal and the outer cylinder 20 is made of resin. The elastic body 30 is made of an elastic material such as rubber having a predetermined elasticity, and the inner peripheral surface 22i of the tubular portion 22 of the outer cylinder 20 and the outer peripheral surface 10o of the inner cylinder 10 are integrated by, for example, vulcanization adhesion. By doing so, the inner cylinder 10 and the outer cylinder 20 are elastically connected.

外筒20は、受け部材2の受孔2Aに収容される筒部22と、筒部22の圧入時に受け部材2に衝接可能に設けられる鍔部24とを備える。
図2(b),(c)に示すように、筒部22は、円周方向の一部が他部に比べて肉厚の円筒状に形成されている。
筒部22は、外周面22oが真円形状の円筒面として形成され、内周面22iが内筒10の外周面までの距離が円周方向に異なる筒面として楕円形状に形成されている。また、外周面22oの中心軸は、内筒10の中心軸O1と同軸に設定されている。筒部22の外径d1は、受け部材2の受孔2Aの内径D1よりも所定寸法大きくなるように設定される。ここでいう所定寸法とは、受孔2Aに圧入するときの嵌め合いや、筒部22の肉厚などに応じて設定されるものをいう。
The outer cylinder 20 includes a tubular portion 22 housed in the receiving hole 2A of the receiving member 2, and a flange portion 24 provided so as to be in contact with the receiving member 2 when the tubular portion 22 is press-fitted.
As shown in FIGS. 2 (b) and 2 (c), the tubular portion 22 is formed in a cylindrical shape in which a part in the circumferential direction is thicker than the other portions.
The outer peripheral surface 22o of the tubular portion 22 is formed as a perfectly circular cylindrical surface, and the inner peripheral surface 22i is formed in an elliptical shape as a tubular surface having different distances to the outer peripheral surface of the inner cylinder 10 in the circumferential direction. Further, the central axis of the outer peripheral surface 22o is set coaxially with the central axis O1 of the inner cylinder 10. The outer diameter d1 of the tubular portion 22 is set to be larger than the inner diameter D1 of the receiving hole 2A of the receiving member 2. The predetermined dimensions referred to here are those that are set according to the fitting when press-fitting into the receiving hole 2A, the wall thickness of the tubular portion 22, and the like.

鍔部24は、筒部22の一端側の外周面22oから半径方向に突出し、円周方向に沿って一周にわたり延長する円板状に形成される。鍔部24は、例えば、防振装置1を受け部材2の受孔2Aに筒部22を圧入するときに、受け部材2に衝接することで受け部材2に対する防振装置1の位置を所定の位置に位置決めする位置決め手段としての機能を有する。また、筒部22の他端側には、半径方向内向きに突出し、円周方向に沿って延長するリブ2Bが設けられている。リブ2Bは、例えば、受孔2Aの形状を維持する補強部として機能したり、防振装置1の受孔2Aからの脱落を防止するなどの機能を有する。 The flange portion 24 is formed in a disk shape that protrudes in the radial direction from the outer peripheral surface 22o on one end side of the tubular portion 22 and extends around the circumference. For example, when the tubular portion 22 is press-fitted into the receiving hole 2A of the receiving member 2 by the flange portion 24, the position of the vibration isolating device 1 with respect to the receiving member 2 is determined by abutting against the receiving member 2. It has a function as a positioning means for positioning the position. Further, on the other end side of the tubular portion 22, a rib 2B that projects inward in the radial direction and extends along the circumferential direction is provided. The rib 2B has a function of, for example, functioning as a reinforcing portion for maintaining the shape of the receiving hole 2A and preventing the vibration isolator 1 from falling out of the receiving hole 2A.

筒部22の外周には、防振装置1が受け部材2からの脱落を防止するための抜け止め防止手段として機能する脱落防止部40を備える。なお、以下の説明では、筒部22において脱落防止部40を除く部分をベース部26という。 On the outer periphery of the tubular portion 22, a dropout prevention portion 40 is provided, which functions as a retaining means for preventing the vibration isolator 1 from falling off from the receiving member 2. In the following description, the portion of the tubular portion 22 excluding the dropout prevention portion 40 is referred to as a base portion 26.

図2(a),(b)に示すように、脱落防止部40は、筒部22の肉厚部分に対応して設けられる。脱落防止部40は、この肉厚部分において筒部22の外周面22oに一部が露出するようにベース部26の複数箇所に設けられる。つまり、筒部22は、脱落防止部40の形成に伴う外筒20の剛性の低下を防ぐべく、一部が肉厚に形成されている。図2(c)に示すように、本実施形態では、各脱落防止部40は、円周方向に沿って半周分延長するように形成されている。なお、延長する長さは、半周に限定されず、一周等適宜設定すれば良い。 As shown in FIGS. 2A and 2B, the dropout prevention portion 40 is provided corresponding to the thick portion of the tubular portion 22. The dropout prevention portions 40 are provided at a plurality of locations on the base portion 26 so that a part of the thick portion is exposed on the outer peripheral surface 22o of the tubular portion 22. That is, a part of the cylinder portion 22 is formed to be thick in order to prevent the rigidity of the outer cylinder 20 from being lowered due to the formation of the dropout prevention portion 40. As shown in FIG. 2C, in the present embodiment, each dropout prevention portion 40 is formed so as to extend by half a circumference along the circumferential direction. The length to be extended is not limited to half a lap, and may be appropriately set such as one lap.

即ち、ベース部26には、脱落防止部40を該ベース部26の円周方向に沿って設けるための、溝28が形成され、この溝28に脱落防止部40が形成される。
図2(b)に示すように、溝28は、半径方向の断面視において矩形状に形成され、この断面形状を維持したまま円周方向に連続して形成されている。そして、脱落防止部40は、表面(以下露出面等ともいう。)40sがベース部26の表面26sと面一となり、ベース部26と一つの筒面を形成し、筒部22の外周面22oをなすように溝に設けられている。
脱落防止部40は、ベース部26を形成する樹脂と異なる特性を有する樹脂により形成される。脱落防止部40を形成する樹脂の特性としては、ベース部26を形成する樹脂よりも剛性が小さく、弾性が大きいものが好ましい。
That is, a groove 28 is formed in the base portion 26 for providing the fall prevention portion 40 along the circumferential direction of the base portion 26, and the fall prevention portion 40 is formed in the groove 28.
As shown in FIG. 2B, the grooves 28 are formed in a rectangular shape in a cross-sectional view in the radial direction, and are continuously formed in the circumferential direction while maintaining this cross-sectional shape. The surface (hereinafter, also referred to as an exposed surface) 40s of the dropout prevention portion 40 is flush with the surface 26s of the base portion 26 to form one tubular surface with the base portion 26, and the outer peripheral surface 22o of the tubular portion 22 is formed. It is provided in the groove so as to form a.
The dropout prevention portion 40 is formed of a resin having characteristics different from the resin forming the base portion 26. As the characteristics of the resin forming the dropout prevention portion 40, it is preferable that the resin has lower rigidity and higher elasticity than the resin forming the base portion 26.

ベース部26を形成する樹脂には、例えば、例えば、ナイロン66(PA66)や芳香族ポリアミド(PA-芳香族)、或いは、これらにガラスファイバー等の補強繊維を含ませたものを用いることができる。 As the resin forming the base portion 26, for example, nylon 66 (PA66), aromatic polyamide (PA-aromatic), or a resin containing reinforcing fibers such as glass fiber can be used. ..

また、脱落防止部40を形成する樹脂には、ベース部26を形成する樹脂に比べて剛性が小さく、また、弾性が大きな特性を有するものが好ましい。このような樹脂には、例えば、熱可塑性エラストマー(Thermoplastic Elastomers;TPE)を用いることができる。TPEには、例えば、スチレン系熱可塑性エラストマー(TPS、SBS、SBC、SIS、SEBS)、オレフィン系熱可塑性エラストマー(TPO)、塩化ビニル系熱可塑性エラストマー(TPVC)、ポリウレタン系熱可塑性エラストマー(TPU)、ポリエステル系熱可塑性エラストマー(TPEE、TPC)、ポリアミド系熱可塑性エラストマー(TPAE、TPA)、ポリブタジエン系熱可塑性エラストマー(PB,RB)等を利用することができる。 Further, the resin forming the fall-off prevention portion 40 is preferably one having a property of having a smaller rigidity and a larger elasticity than the resin forming the base portion 26. As such a resin, for example, a thermoplastic elastomer (TPE) can be used. Examples of TPE include styrene-based thermoplastic elastomers (TPS, SBS, SBC, SIS, SEBS), olefin-based thermoplastic elastomers (TPO), vinyl chloride-based thermoplastic elastomers (TPVC), and polyurethane-based thermoplastic elastomers (TPU). , Polyester-based thermoplastic elastomers (TPEE, TPC), polyamide-based thermoplastic elastomers (TPAE, TPA), polybutadiene-based thermoplastic elastomers (PB, RB) and the like can be used.

このように筒部22の素材に、異なる性質の異なる2つの樹脂で形成する場合、外筒20は、所謂2色成形により形成することができる。例えば、金型にベース部26及び鍔部24となる樹脂を射出成型し、脱落防止部40となる樹脂が射出される溝を形成した後に、この溝に脱落防止部40となる樹脂を射出して一体的に形成することができる。このように、二色成形することにより、ベース部26の樹脂と、脱落防止部40の樹脂とが、熱溶着されて一体的に形成される。 When the material of the cylinder portion 22 is formed of two resins having different properties in this way, the outer cylinder 20 can be formed by so-called two-color molding. For example, the resin to be the base portion 26 and the flange portion 24 is injection-molded into the mold to form a groove into which the resin to be the fall-out prevention portion 40 is injected, and then the resin to be the fall-out prevention portion 40 is injected into this groove. Can be integrally formed. By the two-color molding in this way, the resin of the base portion 26 and the resin of the dropout prevention portion 40 are heat-welded and integrally formed.

上述のように構成された防振装置1は、受け部材2に次のように圧入される。
防振装置1の中心軸O1と受け部材2の受孔2Aの中心軸O2とを一致させた状態で、外筒20を軸方向に押圧することで、図1に示すように、筒部22のベース部26が外径d1から受孔2Aの内径D1に縮径されながら受孔2A内に進入する。また、筒部22において脱落防止部40が形成された位置では、ベース部26とともに脱落防止部40が、外径d1から受孔2Aの内径D1に縮径されて受孔2A内に圧入される。
防振装置1は、鍔部24が受け部材2に衝接するまで圧入されると、受孔2A内において、縮径したベース部26の剛性による抜け耐力と、縮径した脱落防止部40の弾性力による抜け耐力とが作用し、受け部材2に圧入固定される。
The vibration isolator 1 configured as described above is press-fitted into the receiving member 2 as follows.
As shown in FIG. 1, by pressing the outer cylinder 20 in the axial direction in a state where the central axis O1 of the vibration isolator 1 and the central axis O2 of the receiving hole 2A of the receiving member 2 are aligned with each other, the cylinder portion 22 The base portion 26 of the above hole enters the receiving hole 2A while being reduced in diameter from the outer diameter d1 to the inner diameter D1 of the receiving hole 2A. Further, at the position where the fall prevention portion 40 is formed in the tubular portion 22, the fall prevention portion 40 together with the base portion 26 is reduced in diameter from the outer diameter d1 to the inner diameter D1 of the receiving hole 2A and press-fitted into the receiving hole 2A. ..
When the flange portion 24 is press-fitted until it comes into contact with the receiving member 2, the vibration isolator 1 has a proof stress due to the rigidity of the reduced diameter base portion 26 and the elasticity of the reduced diameter fall prevention portion 40 in the receiving hole 2A. The pull-out resistance due to the force acts, and it is press-fitted and fixed to the receiving member 2.

このように受け部材2に固定された防振装置1は、マウントとしての動作により、外筒20のベース部26にクリープが発生し、ベース部26による抜け耐力が低下する。一方、脱落防止部40は、圧入時に、受け部材2とベース部26とに挟まれて圧縮した状態にあるため、クリープによりベース部26が縮径した場合でも、その弾性により、受け部材2を半径方向外向きに押し出す反力による抜け耐力が得られる。
つまり、外筒20は、クリープの発生によりベース部26の直径が受孔2Aの内径D1よりも小さい直径d2へと変化しても、脱落防止部40がその弾性によりベース部26の周面よりも外側に飛び出して受孔2Aの内径D1を維持するため、防振装置1の抜け耐力を向上させることができる。
したがって、外筒20に脱落防止部40を設けたことにより、外筒20をベース部26を形成する樹脂のみで形成したときに比べて抜け耐力を向上させることができる。
The vibration isolator 1 fixed to the receiving member 2 in this way causes creep in the base portion 26 of the outer cylinder 20 due to the operation as a mount, and the pull-out resistance of the base portion 26 decreases. On the other hand, since the fall-off prevention portion 40 is in a compressed state of being sandwiched between the receiving member 2 and the base portion 26 at the time of press fitting, even if the diameter of the base portion 26 is reduced due to creep, the receiving member 2 is affected by its elasticity. The pull-out resistance due to the reaction force that pushes outward in the radial direction can be obtained.
That is, even if the diameter of the base portion 26 of the outer cylinder 20 changes to a diameter d2 smaller than the inner diameter D1 of the receiving hole 2A due to the occurrence of creep, the fall-out prevention portion 40 is elastic from the peripheral surface of the base portion 26. Since the inner diameter D1 of the receiving hole 2A is maintained by protruding outward, the pull-out resistance of the vibration isolator 1 can be improved.
Therefore, by providing the outer cylinder 20 with the dropout prevention portion 40, it is possible to improve the pull-out resistance as compared with the case where the outer cylinder 20 is formed only of the resin forming the base portion 26.

また、防振装置1が圧入される受け部材2の受孔2Aは、プレス品やパイプが用いられる場合が多く、その形状は真円ではない場合が多い。このため、受孔2Aに圧入される筒部22を前述のベース部26を形成する樹脂のみで形成した場合、受孔2Aとの間に部分的に隙間ができる部分(密着しない部分)がある。このような場合でも、脱落防止部40を設けておくことにより、脱落防止部40が弾性によって外側に飛び出して隙間に密着し、抜け耐力を安定、或いは向上させることができる。 Further, the receiving hole 2A of the receiving member 2 into which the vibration isolator 1 is press-fitted is often a pressed product or a pipe, and its shape is often not a perfect circle. For this reason, when the tubular portion 22 to be press-fitted into the receiving hole 2A is formed only of the resin forming the base portion 26 described above, there is a portion (a portion that does not adhere) with the receiving hole 2A. .. Even in such a case, by providing the fall-out prevention portion 40, the fall-off prevention portion 40 elastically protrudes to the outside and adheres to the gap, so that the pull-out resistance can be stabilized or improved.

以上説明したように、防振装置1において、受け部材2に圧入される外筒20の筒部22を、樹脂からなるベース部26と、ベース部26よりもクリープ特性、耐熱老化特性、耐候性に優れた樹脂(TPE)からなる脱落防止部40により形成することにより、受け部材2に対して圧入しやすく、また、ベース部26のクリープによる抜け耐力の低下がみられた場合でも、抜け耐力を維持することができる。 As described above, in the vibration isolator 1, the cylinder portion 22 of the outer cylinder 20 press-fitted into the receiving member 2 has a base portion 26 made of resin and a creep characteristic, a heat aging characteristic, and a weather resistance more than the base portion 26. By forming it with a drop-out prevention portion 40 made of an excellent resin (TPE), it is easy to press-fit it into the receiving member 2, and even if a decrease in pull-out resistance due to creep of the base portion 26 is observed, the pull-out resistance is reduced. Can be maintained.

なお、防振装置1の受け部材2からの抜け耐力の基準は、圧入にともなって縮径する筒部22のベース部26の有する弾性率、引張強度、曲げ強さ等の機械的な強度、及び縮径量により設定すれば良い。
また、脱落防止部40により得られる抜け耐力は、TPEの材質、硬度、縮径量等を変更することで、受け部材2から脱落防止部40が受ける反力を調整すれば良い。
The reference for the yield strength of the vibration isolator 1 from the receiving member 2 is the mechanical strength such as the elastic modulus, tensile strength, and bending strength of the base portion 26 of the tubular portion 22 whose diameter is reduced by press fitting. It may be set according to the diameter reduction amount.
Further, the pull-out proof stress obtained by the fall-out prevention portion 40 may be adjusted by adjusting the reaction force received by the fall-off prevention portion 40 from the receiving member 2 by changing the material, hardness, diameter reduction amount, etc. of the TPE.

外筒20において脱落防止部40が形成される形態は、上記実施形態に限定されない。図3は、脱落防止部40の他の形成形態を示す図である。なお、図3において防振装置1を形成する内筒10や弾性体30は、省略して示してある。
例えば、上記実施形態では、筒部22の複数箇所に設けられた各脱落防止部40がベース部26の表面26sと面一となるように、筒部22の外周面22oに露出するものとして説明したがこれに限定されない。例えば、圧入前の状態において、図3(a)に示すように、中心軸Oから脱落防止部40の露出面40sまでの半径方向の距離r1が、中心軸Oからベース部26の表面26sまでの距離R1よりも大きくなるように、脱落防止部40が、ベース部26の表面26sよりも半径方向外側に突出するように形成しても良い。
The form in which the dropout prevention portion 40 is formed in the outer cylinder 20 is not limited to the above embodiment. FIG. 3 is a diagram showing another form of the dropout prevention portion 40. In FIG. 3, the inner cylinder 10 and the elastic body 30 forming the vibration isolator 1 are omitted.
For example, in the above embodiment, it is assumed that each of the dropout prevention portions 40 provided at a plurality of positions of the cylinder portion 22 is exposed on the outer peripheral surface 22o of the cylinder portion 22 so as to be flush with the surface 26s of the base portion 26. However, it is not limited to this. For example, in the state before press fitting, as shown in FIG. 3A, the radial distance r1 from the central axis O to the exposed surface 40s of the dropout prevention portion 40 is from the central axis O to the surface 26s of the base portion 26. The dropout prevention portion 40 may be formed so as to protrude outward in the radial direction from the surface 26s of the base portion 26 so as to be larger than the distance R1.

また、脱落防止部40の筒部22の外周面22oにおける露出状態が、脱落防止部40の形成された各位置において、ベース部26の表面26sから突出したり、面一としたり、窪むようにしたり変化させても良い。即ち、図3(b)に示すように、脱落防止部40を、鍔部24側から軸方向に40A,40B,40C等として示すと、圧入前の状態において、中心軸Oから脱落防止部40Aの露出面40sまでの半径方向の距離rAが、中心軸Oからベース部26の表面26sまでの距離R1に一致し、中心軸Oから脱落防止部40Bの露出面40sまでの半径方向の距離rBが、中心軸Oからベース部26の表面26sまでの距離R1よりも半径方向内側に窪み、中心軸Oから脱落防止部40Cの露出面40sまでの半径方向の距離rCが、中心軸Oからベース部26の表面26sまでの距離R1よりも半径方向外側に突出するように形成しても良い。 Further, the exposed state of the outer peripheral surface 22o of the tubular portion 22 of the dropout prevention portion 40 may protrude from the surface 26s of the base portion 26, be flush with each other, or be recessed at each position where the dropout prevention portion 40 is formed. You may change it. That is, as shown in FIG. 3B, when the fall-off prevention portion 40 is shown as 40A, 40B, 40C or the like in the axial direction from the flange portion 24 side, the fall-off prevention portion 40A is shown from the central axis O in the state before press fitting. The radial distance rA to the exposed surface 40s of the above corresponds to the distance R1 from the central axis O to the surface 26s of the base portion 26, and the radial distance rB from the central axis O to the exposed surface 40s of the falling prevention portion 40B. However, the distance rC in the radial direction from the central axis O to the surface 26s of the base portion 26 is recessed inward in the radial direction from the central axis O, and the radial distance rC from the central axis O to the exposed surface 40s of the dropout prevention portion 40C is from the central axis O to the base. It may be formed so as to protrude outward in the radial direction from the distance R1 to the surface 26s of the portion 26.

また、脱落防止部40は、上述のように筒部22の外周を円周方向に沿って延長することに限定されない。例えば、図4乃至図6に示すように形成しても良い。
図4(a)は、筒部22の外周に脱落防止部40を格子状に点在させて筒部22の外周面22oに露出するように配置した形態を示している。
また、図4(b)は、防振装置1の動作において、内筒10及び外筒20の相対的な変異が一方向に大きく(図中矢印sで示す方向)、他方向に小さい場合に、大きな変異方向に沿う面にのみ脱落防止部40を格子状に点在させた形態を示している。
この場合においても、図3(b)に示したように、ベース部26の表面26sから脱落防止部40の露出面40sが、突出したり、面一としたり、窪むようにしたりしても良い。
Further, the dropout prevention portion 40 is not limited to extending the outer circumference of the tubular portion 22 along the circumferential direction as described above. For example, it may be formed as shown in FIGS. 4 to 6.
FIG. 4A shows a form in which the dropout prevention portions 40 are scattered on the outer circumference of the cylinder portion 22 in a grid pattern so as to be exposed on the outer peripheral surface 22o of the cylinder portion 22.
Further, FIG. 4B shows a case where the relative variation of the inner cylinder 10 and the outer cylinder 20 is large in one direction (direction indicated by the arrow s in the figure) and small in the other direction in the operation of the vibration isolator 1. , The form in which the dropout prevention portions 40 are scattered in a grid pattern only on the surface along the large mutation direction is shown.
In this case as well, as shown in FIG. 3B, the exposed surface 40s of the dropout prevention portion 40 may protrude from the surface 26s of the base portion 26, be flush with the surface, or be recessed.

また、脱落防止部40が筒部22の外周面22oに露出する形状は、矩形状に限定されず、図5(a)に示すように、円形としても良い。 Further, the shape in which the dropout prevention portion 40 is exposed on the outer peripheral surface 22o of the tubular portion 22 is not limited to a rectangular shape, and may be a circular shape as shown in FIG. 5 (a).

また、図1等に示すように、脱落防止部40を円周方向に沿って延長させる場合、図5(b)に示すように、円周方向に対して軸方向に向けて傾斜するように脱落防止部40を形成しても良い。
また、図5(c)に示すように、脱落防止部40を筒部22の外周面22oに、らせん状に連続して露出するように形成しても良い。このように、脱落防止部40を格子状やらせん状に設けることにより、脱落防止部40のベース部26に対する機械的な結合力を大きくすることができる。
Further, as shown in FIG. 1 and the like, when the dropout prevention portion 40 is extended along the circumferential direction, as shown in FIG. 5 (b), it is inclined in the axial direction with respect to the circumferential direction. The dropout prevention portion 40 may be formed.
Further, as shown in FIG. 5C, the dropout prevention portion 40 may be formed so as to be continuously and spirally exposed on the outer peripheral surface 22o of the tubular portion 22. By providing the dropout prevention portion 40 in a grid pattern or a spiral shape in this way, the mechanical coupling force of the dropout prevention portion 40 to the base portion 26 can be increased.

また、図1に示すように、円周方向に沿って延長する脱落防止部40を複数形成する場合、脱落防止部40同士を互いに接続する連結部42を設けることで、脱落防止部40のベース部26に対する機械的な結合力を大きくすることができる。 Further, as shown in FIG. 1, when a plurality of dropout prevention portions 40 extending along the circumferential direction are formed, the base of the dropout prevention portion 40 is provided by providing a connecting portion 42 for connecting the dropout prevention portions 40 to each other. The mechanical coupling force to the portion 26 can be increased.

また、複数の脱落防止部40同士を連結する連結部42は、図5(c)に示すように、筒部22の外周面22oに露出させずに、図6に示すように、ベース部26内において連結するように形成しても良い。
即ち、ベース部26に対して脱落防止部40の密着面積を大きくするように溝や穴等の凹部を形成するとよい。
Further, as shown in FIG. 5C, the connecting portion 42 connecting the plurality of falling-out prevention portions 40 is not exposed on the outer peripheral surface 22o of the tubular portion 22, and as shown in FIG. 6, the base portion 26 is connected. It may be formed so as to be connected within.
That is, it is preferable to form recesses such as grooves and holes so as to increase the contact area of the dropout prevention portion 40 with respect to the base portion 26.

以上説明したように、ベース部26の表面26sに、脱落防止部40を充填するための溝、角柱状や円柱状の穴等の窪む凹部を、ベース部26の成型工程において形成し、脱落防止部40を充填して外筒20を形成することにより、防振装置1を受け部材2に圧入しやすく、また、圧入後も受け部材2から抜けにくい状態を安定して維持することができる As described above, the surface 26s of the base portion 26 is formed with recesses such as grooves for filling the fall-out prevention portion 40 and recessed holes such as prismatic and columnar holes in the molding process of the base portion 26, and the base portion 26 falls off. By filling the prevention portion 40 to form the outer cylinder 20, it is possible to easily press-fit the vibration isolator 1 into the receiving member 2 and to stably maintain a state in which it is difficult to come off from the receiving member 2 even after press-fitting.

なお、脱落防止部40となる樹脂が充填される溝や穴は、射出成型で充填可能であればその形状は、適宜設定すれば良く、外筒強度、抜け耐力とのバランスに応じて、その数量、外筒20における露出面積等を決定すれば良い。より好ましくは、ベース部26と脱落防止部40との機械的な結合力が増加するように形成すると良い。 The shape of the groove or hole filled with the resin to be the dropout prevention portion 40 may be appropriately set as long as it can be filled by injection molding, and the shape thereof may be appropriately set according to the balance between the outer cylinder strength and the pull-out resistance. The quantity, the exposed area of the outer cylinder 20, and the like may be determined. More preferably, it is formed so as to increase the mechanical coupling force between the base portion 26 and the dropout prevention portion 40.

また、外筒20のベース部26は、樹脂に限定されず、金属であっても良い。この場合、ベース部26における筒部22の外周面26oに凹部を設け、この凹部に脱落防止部40を形成する樹脂を充填すれば良い。 Further, the base portion 26 of the outer cylinder 20 is not limited to resin, and may be metal. In this case, a concave portion may be provided on the outer peripheral surface 26o of the tubular portion 22 in the base portion 26, and the concave portion may be filled with a resin for forming the dropout prevention portion 40.

また、上述の実施形態では、外筒20が鍔部24を備えたり、防振装置1が圧入される受け部材2の受孔2Aに外筒20が衝接する突部片を備えたりするものとして説明したが、それらは必ずしも必須ではなく、適宜設ければ良い。 Further, in the above-described embodiment, the outer cylinder 20 is provided with a flange portion 24, or the outer cylinder 20 is provided with a protrusion piece that abuts the receiving hole 2A of the receiving member 2 into which the vibration isolator 1 is press-fitted. As described above, they are not always essential and may be provided as appropriate.

また、脱落防止部40をベース部26の複数箇所に設ける場合、弾性率の異なる樹脂を組み合わせてベース部26に設けても良い。 Further, when the dropout prevention portions 40 are provided at a plurality of locations on the base portion 26, resins having different elastic moduli may be combined and provided on the base portion 26.

1 防振装置、2 受け部材、2A 受孔、10 内筒、
20 外筒、22 筒部、22i 内周面、22o 外周面、24 鍔部、
26 ベース部、30 弾性体、40 脱落防止部、
d1 外径、D1 内径、O1 中心軸。
1 Anti-vibration device, 2 receiving member, 2A receiving hole, 10 inner cylinder,
20 outer cylinder, 22 cylinder part, 22i inner peripheral surface, 22o outer peripheral surface, 24 collar part,
26 base part, 30 elastic body, 40 fall prevention part,
d1 outer diameter, D1 inner diameter, O1 central axis.

Claims (4)

外筒と、
前記外筒の内周側に配置される内筒と、
前記外筒及び前記内筒を弾性的に結合する弾性体と、
を備えた防振装置であって、
前記外筒は、該外筒の外周面に露出し、外筒の他部を形成する素材よりも剛性が小さい樹脂を有することを特徴とする防振装置。
With the outer cylinder
The inner cylinder arranged on the inner peripheral side of the outer cylinder and
An elastic body that elastically connects the outer cylinder and the inner cylinder,
It is a vibration isolation device equipped with
The outer cylinder is a vibration isolator that is exposed on the outer peripheral surface of the outer cylinder and has a resin having a lower rigidity than the material forming the other portion of the outer cylinder.
前記外筒の他部は、前記樹脂と異なる樹脂で形成されたことを特徴とする請求項1に記載の防振装置。 The vibration isolator according to claim 1, wherein the other portion of the outer cylinder is made of a resin different from the resin. 前記外筒は、外周面に半径方向に窪む凹部を有し、前記外筒の外周面に露出する樹脂が前記凹部に設けられたことを特徴とする請求項1又は請求項2に記載の防振装置。 The first or second aspect of the present invention, wherein the outer cylinder has a concave portion that is recessed in the radial direction on the outer peripheral surface, and a resin exposed on the outer peripheral surface of the outer cylinder is provided in the concave portion. Anti-vibration device. 前記外筒の外周面に露出する樹脂は、前記他部を形成する樹脂により形成される外周面よりも半径方向外側に突出していることを特徴とする請求項1乃至請求項3いずれかに記載の防振装置。 The resin according to any one of claims 1 to 3, wherein the resin exposed on the outer peripheral surface of the outer cylinder protrudes radially outward from the outer peripheral surface formed by the resin forming the other portion. Anti-vibration device.
JP2019224568A 2019-12-12 2019-12-12 Vibration isolating device Pending JP2021092297A (en)

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